target/linux/generic/patches-2.6.34/150-netfilter_imq.patch

   1 --- /dev/null
   2 +++ b/drivers/net/imq.c
   3 @@ -0,0 +1,632 @@
   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 + *             2009/04/12
  63 + *              - Add skb_save_cb/skb_restore_cb helper functions for backuping
  64 + *                control buffer. This is needed because qdisc-layer on kernels
  65 + *                2.6.27 and newer overwrite control buffer. (Jussi Kivilinna)
  66 + *              - Add better locking for IMQ device. Hopefully this will solve
  67 + *                SMP issues. (Jussi Kivilinna)
  68 + *              - Port to 2.6.27
  69 + *              - Port to 2.6.28
  70 + *              - Port to 2.6.29 + fix rmmod not working
  71 + *
  72 + *             2009/04/20 - (Jussi Kivilinna)
  73 + *              - Use netdevice feature flags to avoid extra packet handling
  74 + *                by core networking layer and possibly increase performance.
  75 + *
  76 + *             2009/09/26 - (Jussi Kivilinna)
  77 + *              - Add imq_nf_reinject_lockless to fix deadlock with
  78 + *                imq_nf_queue/imq_nf_reinject.
  79 + *
  80 + *             2009/12/08 - (Jussi Kivilinna)
  81 + *              - Port to 2.6.32
  82 + *              - Add check for skb->nf_queue_entry==NULL in imq_dev_xmit()
  83 + *              - Also add better error checking for skb->nf_queue_entry usage
  84 + *
  85 + *            Also, many thanks to pablo Sebastian Greco for making the initial
  86 + *            patch and to those who helped the testing.
  87 + *
  88 + *             More info at: http://www.linuximq.net/ (Andre Correa)
  89 + */
  90 +
  91 +#include <linux/module.h>
  92 +#include <linux/kernel.h>
  93 +#include <linux/moduleparam.h>
  94 +#include <linux/list.h>
  95 +#include <linux/skbuff.h>
  96 +#include <linux/netdevice.h>
  97 +#include <linux/etherdevice.h>
  98 +#include <linux/rtnetlink.h>
  99 +#include <linux/if_arp.h>
 100 +#include <linux/netfilter.h>
 101 +#include <linux/netfilter_ipv4.h>
 102 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 103 +       #include <linux/netfilter_ipv6.h>
 104 +#endif
 105 +#include <linux/imq.h>
 106 +#include <net/pkt_sched.h>
 107 +#include <net/netfilter/nf_queue.h>
 108 +
 109 +static nf_hookfn imq_nf_hook;
 110 +
 111 +static struct nf_hook_ops imq_ingress_ipv4 = {
 112 +       .hook           = imq_nf_hook,
 113 +       .owner          = THIS_MODULE,
 114 +       .pf             = PF_INET,
 115 +       .hooknum        = NF_INET_PRE_ROUTING,
 116 +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 117 +       .priority       = NF_IP_PRI_MANGLE + 1
 118 +#else
 119 +       .priority       = NF_IP_PRI_NAT_DST + 1
 120 +#endif
 121 +};
 122 +
 123 +static struct nf_hook_ops imq_egress_ipv4 = {
 124 +       .hook           = imq_nf_hook,
 125 +       .owner          = THIS_MODULE,
 126 +       .pf             = PF_INET,
 127 +       .hooknum        = NF_INET_POST_ROUTING,
 128 +#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA)
 129 +       .priority       = NF_IP_PRI_LAST
 130 +#else
 131 +       .priority       = NF_IP_PRI_NAT_SRC - 1
 132 +#endif
 133 +};
 134 +
 135 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 136 +static struct nf_hook_ops imq_ingress_ipv6 = {
 137 +       .hook           = imq_nf_hook,
 138 +       .owner          = THIS_MODULE,
 139 +       .pf             = PF_INET6,
 140 +       .hooknum        = NF_INET_PRE_ROUTING,
 141 +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 142 +       .priority       = NF_IP6_PRI_MANGLE + 1
 143 +#else
 144 +       .priority       = NF_IP6_PRI_NAT_DST + 1
 145 +#endif
 146 +};
 147 +
 148 +static struct nf_hook_ops imq_egress_ipv6 = {
 149 +       .hook           = imq_nf_hook,
 150 +       .owner          = THIS_MODULE,
 151 +       .pf             = PF_INET6,
 152 +       .hooknum        = NF_INET_POST_ROUTING,
 153 +#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA)
 154 +       .priority       = NF_IP6_PRI_LAST
 155 +#else
 156 +       .priority       = NF_IP6_PRI_NAT_SRC - 1
 157 +#endif
 158 +};
 159 +#endif
 160 +
 161 +#if defined(CONFIG_IMQ_NUM_DEVS)
 162 +static unsigned int numdevs = CONFIG_IMQ_NUM_DEVS;
 163 +#else
 164 +static unsigned int numdevs = IMQ_MAX_DEVS;
 165 +#endif
 166 +
 167 +static DEFINE_SPINLOCK(imq_nf_queue_lock);
 168 +
 169 +static struct net_device *imq_devs_cache[IMQ_MAX_DEVS];
 170 +
 171 +
 172 +static struct net_device_stats *imq_get_stats(struct net_device *dev)
 173 +{
 174 +       return &dev->stats;
 175 +}
 176 +
 177 +/* called for packets kfree'd in qdiscs at places other than enqueue */
 178 +static void imq_skb_destructor(struct sk_buff *skb)
 179 +{
 180 +       struct nf_queue_entry *entry = skb->nf_queue_entry;
 181 +
 182 +       skb->nf_queue_entry = NULL;
 183 +
 184 +       if (entry) {
 185 +               nf_queue_entry_release_refs(entry);
 186 +               kfree(entry);
 187 +       }
 188 +
 189 +       skb_restore_cb(skb); /* kfree backup */
 190 +}
 191 +
 192 +/* locking not needed when called from imq_nf_queue */
 193 +static void imq_nf_reinject_lockless(struct nf_queue_entry *entry,
 194 +                                               unsigned int verdict)
 195 +{
 196 +       int status;
 197 +
 198 +       if (!entry->next_outfn) {
 199 +               nf_reinject(entry, verdict);
 200 +               return;
 201 +       }
 202 +
 203 +       status = entry->next_outfn(entry, entry->next_queuenum);
 204 +       if (status < 0) {
 205 +               nf_queue_entry_release_refs(entry);
 206 +               kfree_skb(entry->skb);
 207 +               kfree(entry);
 208 +       }
 209 +}
 210 +
 211 +static void imq_nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
 212 +{
 213 +       int status;
 214 +
 215 +       if (!entry->next_outfn) {
 216 +               spin_lock_bh(&imq_nf_queue_lock);
 217 +               nf_reinject(entry, verdict);
 218 +               spin_unlock_bh(&imq_nf_queue_lock);
 219 +               return;
 220 +       }
 221 +
 222 +       rcu_read_lock();
 223 +       local_bh_disable();
 224 +       status = entry->next_outfn(entry, entry->next_queuenum);
 225 +       local_bh_enable();
 226 +       if (status < 0) {
 227 +               nf_queue_entry_release_refs(entry);
 228 +               kfree_skb(entry->skb);
 229 +               kfree(entry);
 230 +       }
 231 +
 232 +       rcu_read_unlock();
 233 +}
 234 +
 235 +static netdev_tx_t imq_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 236 +{
 237 +       struct nf_queue_entry *entry = skb->nf_queue_entry;
 238 +
 239 +       skb->nf_queue_entry = NULL;
 240 +       dev->trans_start = jiffies;
 241 +
 242 +       dev->stats.tx_bytes += skb->len;
 243 +       dev->stats.tx_packets++;
 244 +
 245 +       if (entry == NULL) {
 246 +               /* We don't know what is going on here.. packet is queued for
 247 +                * imq device, but (probably) not by us.
 248 +                *
 249 +                * If this packet was not send here by imq_nf_queue(), then
 250 +                * skb_save_cb() was not used and skb_free() should not show:
 251 +                *   WARNING: IMQ: kfree_skb: skb->cb_next:..
 252 +                * and/or
 253 +                *   WARNING: IMQ: kfree_skb: skb->nf_queue_entry...
 254 +                *
 255 +                * However if this message is shown, then IMQ is somehow broken
 256 +                * and you should report this to linuximq.net.
 257 +                */
 258 +
 259 +               /* imq_dev_xmit is black hole that eats all packets, report that
 260 +                * we eat this packet happily and increase dropped counters.
 261 +                */
 262 +
 263 +               dev->stats.tx_dropped++;
 264 +               dev_kfree_skb(skb);
 265 +
 266 +               return NETDEV_TX_OK;
 267 +       }
 268 +
 269 +       skb_restore_cb(skb); /* restore skb->cb */
 270 +
 271 +       skb->imq_flags = 0;
 272 +       skb->destructor = NULL;
 273 +
 274 +       imq_nf_reinject(entry, NF_ACCEPT);
 275 +
 276 +       return NETDEV_TX_OK;
 277 +}
 278 +
 279 +static int imq_nf_queue(struct nf_queue_entry *entry, unsigned queue_num)
 280 +{
 281 +       struct net_device *dev;
 282 +       struct sk_buff *skb_orig, *skb, *skb_shared;
 283 +       struct Qdisc *q;
 284 +       struct netdev_queue *txq;
 285 +       int users, index;
 286 +       int retval = -EINVAL;
 287 +
 288 +       index = entry->skb->imq_flags & IMQ_F_IFMASK;
 289 +       if (unlikely(index > numdevs - 1)) {
 290 +               if (net_ratelimit())
 291 +                       printk(KERN_WARNING
 292 +                              "IMQ: invalid device specified, highest is %u\n",
 293 +                              numdevs - 1);
 294 +               retval = -EINVAL;
 295 +               goto out;
 296 +       }
 297 +
 298 +       /* check for imq device by index from cache */
 299 +       dev = imq_devs_cache[index];
 300 +       if (unlikely(!dev)) {
 301 +               char buf[8];
 302 +
 303 +               /* get device by name and cache result */
 304 +               snprintf(buf, sizeof(buf), "imq%d", index);
 305 +               dev = dev_get_by_name(&init_net, buf);
 306 +               if (!dev) {
 307 +                       /* not found ?!*/
 308 +                       BUG();
 309 +                       retval = -ENODEV;
 310 +                       goto out;
 311 +               }
 312 +
 313 +               imq_devs_cache[index] = dev;
 314 +               dev_put(dev);
 315 +       }
 316 +
 317 +       if (unlikely(!(dev->flags & IFF_UP))) {
 318 +               entry->skb->imq_flags = 0;
 319 +               imq_nf_reinject_lockless(entry, NF_ACCEPT);
 320 +               retval = 0;
 321 +               goto out;
 322 +       }
 323 +       dev->last_rx = jiffies;
 324 +
 325 +       skb = entry->skb;
 326 +       skb_orig = NULL;
 327 +
 328 +       /* skb has owner? => make clone */
 329 +       if (unlikely(skb->destructor)) {
 330 +               skb_orig = skb;
 331 +               skb = skb_clone(skb, GFP_ATOMIC);
 332 +               if (!skb) {
 333 +                       retval = -ENOMEM;
 334 +                       goto out;
 335 +               }
 336 +               entry->skb = skb;
 337 +       }
 338 +
 339 +       skb->nf_queue_entry = entry;
 340 +
 341 +       dev->stats.rx_bytes += skb->len;
 342 +       dev->stats.rx_packets++;
 343 +
 344 +       txq = dev_pick_tx(dev, skb);
 345 +
 346 +       q = rcu_dereference(txq->qdisc);
 347 +       if (unlikely(!q->enqueue))
 348 +               goto packet_not_eaten_by_imq_dev;
 349 +
 350 +       spin_lock_bh(qdisc_lock(q));
 351 +
 352 +       users = atomic_read(&skb->users);
 353 +
 354 +       skb_shared = skb_get(skb); /* increase reference count by one */
 355 +       skb_save_cb(skb_shared); /* backup skb->cb, as qdisc layer will
 356 +                                       overwrite it */
 357 +       qdisc_enqueue_root(skb_shared, q); /* might kfree_skb */
 358 +
 359 +       if (likely(atomic_read(&skb_shared->users) == users + 1)) {
 360 +               kfree_skb(skb_shared); /* decrease reference count by one */
 361 +
 362 +               skb->destructor = &imq_skb_destructor;
 363 +
 364 +               /* cloned? */
 365 +               if (skb_orig)
 366 +                       kfree_skb(skb_orig); /* free original */
 367 +
 368 +               spin_unlock_bh(qdisc_lock(q));
 369 +
 370 +               /* schedule qdisc dequeue */
 371 +               __netif_schedule(q);
 372 +
 373 +               retval = 0;
 374 +               goto out;
 375 +       } else {
 376 +               skb_restore_cb(skb_shared); /* restore skb->cb */
 377 +               skb->nf_queue_entry = NULL;
 378 +               /* qdisc dropped packet and decreased skb reference count of
 379 +                * skb, so we don't really want to and try refree as that would
 380 +                * actually destroy the skb. */
 381 +               spin_unlock_bh(qdisc_lock(q));
 382 +               goto packet_not_eaten_by_imq_dev;
 383 +       }
 384 +
 385 +packet_not_eaten_by_imq_dev:
 386 +       /* cloned? restore original */
 387 +       if (skb_orig) {
 388 +               kfree_skb(skb);
 389 +               entry->skb = skb_orig;
 390 +       }
 391 +       retval = -1;
 392 +out:
 393 +       return retval;
 394 +}
 395 +
 396 +static struct nf_queue_handler nfqh = {
 397 +       .name  = "imq",
 398 +       .outfn = imq_nf_queue,
 399 +};
 400 +
 401 +static unsigned int imq_nf_hook(unsigned int hook, struct sk_buff *pskb,
 402 +                               const struct net_device *indev,
 403 +                               const struct net_device *outdev,
 404 +                               int (*okfn)(struct sk_buff *))
 405 +{
 406 +       if (pskb->imq_flags & IMQ_F_ENQUEUE)
 407 +               return NF_QUEUE;
 408 +
 409 +       return NF_ACCEPT;
 410 +}
 411 +
 412 +static int imq_close(struct net_device *dev)
 413 +{
 414 +       netif_stop_queue(dev);
 415 +       return 0;
 416 +}
 417 +
 418 +static int imq_open(struct net_device *dev)
 419 +{
 420 +       netif_start_queue(dev);
 421 +       return 0;
 422 +}
 423 +
 424 +static const struct net_device_ops imq_netdev_ops = {
 425 +       .ndo_open               = imq_open,
 426 +       .ndo_stop               = imq_close,
 427 +       .ndo_start_xmit         = imq_dev_xmit,
 428 +       .ndo_get_stats          = imq_get_stats,
 429 +};
 430 +
 431 +static void imq_setup(struct net_device *dev)
 432 +{
 433 +       dev->netdev_ops         = &imq_netdev_ops;
 434 +       dev->type               = ARPHRD_VOID;
 435 +       dev->mtu                = 16000;
 436 +       dev->tx_queue_len       = 11000;
 437 +       dev->flags              = IFF_NOARP;
 438 +       dev->features           = NETIF_F_SG | NETIF_F_FRAGLIST |
 439 +                                 NETIF_F_GSO | NETIF_F_HW_CSUM |
 440 +                                 NETIF_F_HIGHDMA;
 441 +       dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
 442 +}
 443 +
 444 +static int imq_validate(struct nlattr *tb[], struct nlattr *data[])
 445 +{
 446 +       int ret = 0;
 447 +
 448 +       if (tb[IFLA_ADDRESS]) {
 449 +               if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
 450 +                       ret = -EINVAL;
 451 +                       goto end;
 452 +               }
 453 +               if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
 454 +                       ret = -EADDRNOTAVAIL;
 455 +                       goto end;
 456 +               }
 457 +       }
 458 +       return 0;
 459 +end:
 460 +       printk(KERN_WARNING "IMQ: imq_validate failed (%d)\n", ret);
 461 +       return ret;
 462 +}
 463 +
 464 +static struct rtnl_link_ops imq_link_ops __read_mostly = {
 465 +       .kind           = "imq",
 466 +       .priv_size      = 0,
 467 +       .setup          = imq_setup,
 468 +       .validate       = imq_validate,
 469 +};
 470 +
 471 +static int __init imq_init_hooks(void)
 472 +{
 473 +       int err;
 474 +
 475 +       nf_register_queue_imq_handler(&nfqh);
 476 +
 477 +       err = nf_register_hook(&imq_ingress_ipv4);
 478 +       if (err)
 479 +               goto err1;
 480 +
 481 +       err = nf_register_hook(&imq_egress_ipv4);
 482 +       if (err)
 483 +               goto err2;
 484 +
 485 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 486 +       err = nf_register_hook(&imq_ingress_ipv6);
 487 +       if (err)
 488 +               goto err3;
 489 +
 490 +       err = nf_register_hook(&imq_egress_ipv6);
 491 +       if (err)
 492 +               goto err4;
 493 +#endif
 494 +
 495 +       return 0;
 496 +
 497 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 498 +err4:
 499 +       nf_unregister_hook(&imq_ingress_ipv6);
 500 +err3:
 501 +       nf_unregister_hook(&imq_egress_ipv4);
 502 +#endif
 503 +err2:
 504 +       nf_unregister_hook(&imq_ingress_ipv4);
 505 +err1:
 506 +       nf_unregister_queue_imq_handler();
 507 +       return err;
 508 +}
 509 +
 510 +static int __init imq_init_one(int index)
 511 +{
 512 +       struct net_device *dev;
 513 +       int ret;
 514 +
 515 +       dev = alloc_netdev(0, "imq%d", imq_setup);
 516 +       if (!dev)
 517 +               return -ENOMEM;
 518 +
 519 +       ret = dev_alloc_name(dev, dev->name);
 520 +       if (ret < 0)
 521 +               goto fail;
 522 +
 523 +       dev->rtnl_link_ops = &imq_link_ops;
 524 +       ret = register_netdevice(dev);
 525 +       if (ret < 0)
 526 +               goto fail;
 527 +
 528 +       return 0;
 529 +fail:
 530 +       free_netdev(dev);
 531 +       return ret;
 532 +}
 533 +
 534 +static int __init imq_init_devs(void)
 535 +{
 536 +       int err, i;
 537 +
 538 +       if (numdevs < 1 || numdevs > IMQ_MAX_DEVS) {
 539 +               printk(KERN_ERR "IMQ: numdevs has to be betweed 1 and %u\n",
 540 +                      IMQ_MAX_DEVS);
 541 +               return -EINVAL;
 542 +       }
 543 +
 544 +       rtnl_lock();
 545 +       err = __rtnl_link_register(&imq_link_ops);
 546 +
 547 +       for (i = 0; i < numdevs && !err; i++)
 548 +               err = imq_init_one(i);
 549 +
 550 +       if (err) {
 551 +               __rtnl_link_unregister(&imq_link_ops);
 552 +               memset(imq_devs_cache, 0, sizeof(imq_devs_cache));
 553 +       }
 554 +       rtnl_unlock();
 555 +
 556 +       return err;
 557 +}
 558 +
 559 +static int __init imq_init_module(void)
 560 +{
 561 +       int err;
 562 +
 563 +#if defined(CONFIG_IMQ_NUM_DEVS)
 564 +       BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS > 16);
 565 +       BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS < 2);
 566 +       BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS - 1 > IMQ_F_IFMASK);
 567 +#endif
 568 +
 569 +       err = imq_init_devs();
 570 +       if (err) {
 571 +               printk(KERN_ERR "IMQ: Error trying imq_init_devs(net)\n");
 572 +               return err;
 573 +       }
 574 +
 575 +       err = imq_init_hooks();
 576 +       if (err) {
 577 +               printk(KERN_ERR "IMQ: Error trying imq_init_hooks()\n");
 578 +               rtnl_link_unregister(&imq_link_ops);
 579 +               memset(imq_devs_cache, 0, sizeof(imq_devs_cache));
 580 +               return err;
 581 +       }
 582 +
 583 +       printk(KERN_INFO "IMQ driver loaded successfully.\n");
 584 +
 585 +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 586 +       printk(KERN_INFO "\tHooking IMQ before NAT on PREROUTING.\n");
 587 +#else
 588 +       printk(KERN_INFO "\tHooking IMQ after NAT on PREROUTING.\n");
 589 +#endif
 590 +#if defined(CONFIG_IMQ_BEHAVIOR_AB) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 591 +       printk(KERN_INFO "\tHooking IMQ before NAT on POSTROUTING.\n");
 592 +#else
 593 +       printk(KERN_INFO "\tHooking IMQ after NAT on POSTROUTING.\n");
 594 +#endif
 595 +
 596 +       return 0;
 597 +}
 598 +
 599 +static void __exit imq_unhook(void)
 600 +{
 601 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 602 +       nf_unregister_hook(&imq_ingress_ipv6);
 603 +       nf_unregister_hook(&imq_egress_ipv6);
 604 +#endif
 605 +       nf_unregister_hook(&imq_ingress_ipv4);
 606 +       nf_unregister_hook(&imq_egress_ipv4);
 607 +
 608 +       nf_unregister_queue_imq_handler();
 609 +}
 610 +
 611 +static void __exit imq_cleanup_devs(void)
 612 +{
 613 +       rtnl_link_unregister(&imq_link_ops);
 614 +       memset(imq_devs_cache, 0, sizeof(imq_devs_cache));
 615 +}
 616 +
 617 +static void __exit imq_exit_module(void)
 618 +{
 619 +       imq_unhook();
 620 +       imq_cleanup_devs();
 621 +       printk(KERN_INFO "IMQ driver unloaded successfully.\n");
 622 +}
 623 +
 624 +module_init(imq_init_module);
 625 +module_exit(imq_exit_module);
 626 +
 627 +module_param(numdevs, int, 0);
 628 +MODULE_PARM_DESC(numdevs, "number of IMQ devices (how many imq* devices will "
 629 +                       "be created)");
 630 +MODULE_AUTHOR("http://www.linuximq.net");
 631 +MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See "
 632 +                       "http://www.linuximq.net/ for more information.");
 633 +MODULE_LICENSE("GPL");
 634 +MODULE_ALIAS_RTNL_LINK("imq");
 635 +
 636 --- a/drivers/net/Kconfig
 637 +++ b/drivers/net/Kconfig
 638 @@ -121,6 +121,129 @@ config EQUALIZER
 639           To compile this driver as a module, choose M here: the module
 640           will be called eql.  If unsure, say N.
 641
 642 +config IMQ
 643 +       tristate "IMQ (intermediate queueing device) support"
 644 +       depends on NETDEVICES && NETFILTER
 645 +       ---help---
 646 +         The IMQ device(s) is used as placeholder for QoS queueing
 647 +         disciplines. Every packet entering/leaving the IP stack can be
 648 +         directed through the IMQ device where it's enqueued/dequeued to the
 649 +         attached qdisc. This allows you to treat network devices as classes
 650 +         and distribute bandwidth among them. Iptables is used to specify
 651 +         through which IMQ device, if any, packets travel.
 652 +
 653 +         More information at: http://www.linuximq.net/
 654 +
 655 +         To compile this driver as a module, choose M here: the module
 656 +         will be called imq.  If unsure, say N.
 657 +
 658 +choice
 659 +       prompt "IMQ behavior (PRE/POSTROUTING)"
 660 +       depends on IMQ
 661 +       default IMQ_BEHAVIOR_AB
 662 +       help
 663 +
 664 +               This settings defines how IMQ behaves in respect to its
 665 +               hooking in PREROUTING and POSTROUTING.
 666 +
 667 +               IMQ can work in any of the following ways:
 668 +
 669 +                   PREROUTING   |      POSTROUTING
 670 +               -----------------|-------------------
 671 +               #1  After NAT    |      After NAT
 672 +               #2  After NAT    |      Before NAT
 673 +               #3  Before NAT   |      After NAT
 674 +               #4  Before NAT   |      Before NAT
 675 +
 676 +               The default behavior is to hook before NAT on PREROUTING
 677 +               and after NAT on POSTROUTING (#3).
 678 +
 679 +               This settings are specially usefull when trying to use IMQ
 680 +               to shape NATed clients.
 681 +
 682 +               More information can be found at: www.linuximq.net
 683 +
 684 +               If not sure leave the default settings alone.
 685 +
 686 +config IMQ_BEHAVIOR_AA
 687 +       bool "IMQ AA"
 688 +       help
 689 +               This settings defines how IMQ behaves in respect to its
 690 +               hooking in PREROUTING and POSTROUTING.
 691 +
 692 +               Choosing this option will make IMQ hook like this:
 693 +
 694 +               PREROUTING:   After NAT
 695 +               POSTROUTING:  After NAT
 696 +
 697 +               More information can be found at: www.linuximq.net
 698 +
 699 +               If not sure leave the default settings alone.
 700 +
 701 +config IMQ_BEHAVIOR_AB
 702 +       bool "IMQ AB"
 703 +       help
 704 +               This settings defines how IMQ behaves in respect to its
 705 +               hooking in PREROUTING and POSTROUTING.
 706 +
 707 +               Choosing this option will make IMQ hook like this:
 708 +
 709 +               PREROUTING:   After NAT
 710 +               POSTROUTING:  Before NAT
 711 +
 712 +               More information can be found at: www.linuximq.net
 713 +
 714 +               If not sure leave the default settings alone.
 715 +
 716 +config IMQ_BEHAVIOR_BA
 717 +       bool "IMQ BA"
 718 +       help
 719 +               This settings defines how IMQ behaves in respect to its
 720 +               hooking in PREROUTING and POSTROUTING.
 721 +
 722 +               Choosing this option will make IMQ hook like this:
 723 +
 724 +               PREROUTING:   Before NAT
 725 +               POSTROUTING:  After NAT
 726 +
 727 +               More information can be found at: www.linuximq.net
 728 +
 729 +               If not sure leave the default settings alone.
 730 +
 731 +config IMQ_BEHAVIOR_BB
 732 +       bool "IMQ BB"
 733 +       help
 734 +               This settings defines how IMQ behaves in respect to its
 735 +               hooking in PREROUTING and POSTROUTING.
 736 +
 737 +               Choosing this option will make IMQ hook like this:
 738 +
 739 +               PREROUTING:   Before NAT
 740 +               POSTROUTING:  Before NAT
 741 +
 742 +               More information can be found at: www.linuximq.net
 743 +
 744 +               If not sure leave the default settings alone.
 745 +
 746 +endchoice
 747 +
 748 +config IMQ_NUM_DEVS
 749 +
 750 +       int "Number of IMQ devices"
 751 +       range 2 16
 752 +       depends on IMQ
 753 +       default "16"
 754 +       help
 755 +
 756 +               This settings defines how many IMQ devices will be
 757 +               created.
 758 +
 759 +               The default value is 16.
 760 +
 761 +               More information can be found at: www.linuximq.net
 762 +
 763 +               If not sure leave the default settings alone.
 764 +
 765  config TUN
 766         tristate "Universal TUN/TAP device driver support"
 767         select CRC32
 768 --- a/drivers/net/Makefile
 769 +++ b/drivers/net/Makefile
 770 @@ -169,6 +169,7 @@ obj-$(CONFIG_SLHC) += slhc.o
 771  obj-$(CONFIG_XEN_NETDEV_FRONTEND) += xen-netfront.o
 772
 773  obj-$(CONFIG_DUMMY) += dummy.o
 774 +obj-$(CONFIG_IMQ) += imq.o
 775  obj-$(CONFIG_IFB) += ifb.o
 776  obj-$(CONFIG_MACVLAN) += macvlan.o
 777  obj-$(CONFIG_MACVTAP) += macvtap.o
 778 --- /dev/null
 779 +++ b/include/linux/imq.h
 780 @@ -0,0 +1,13 @@
 781 +#ifndef _IMQ_H
 782 +#define _IMQ_H
 783 +
 784 +/* IFMASK (16 device indexes, 0 to 15) and flag(s) fit in 5 bits */
 785 +#define IMQ_F_BITS     5
 786 +
 787 +#define IMQ_F_IFMASK   0x0f
 788 +#define IMQ_F_ENQUEUE  0x10
 789 +
 790 +#define IMQ_MAX_DEVS   (IMQ_F_IFMASK + 1)
 791 +
 792 +#endif /* _IMQ_H */
 793 +
 794 --- a/include/linux/netdevice.h
 795 +++ b/include/linux/netdevice.h
 796 @@ -1203,6 +1203,7 @@ extern int                dev_alloc_name(struct net_de
 797  extern int             dev_open(struct net_device *dev);
 798  extern int             dev_close(struct net_device *dev);
 799  extern void            dev_disable_lro(struct net_device *dev);
 800 +extern struct netdev_queue *dev_pick_tx(struct net_device *dev, struct sk_buff *skb);
 801  extern int             dev_queue_xmit(struct sk_buff *skb);
 802  extern int             register_netdevice(struct net_device *dev);
 803  extern void            unregister_netdevice_queue(struct net_device *dev,
 804 --- /dev/null
 805 +++ b/include/linux/netfilter/xt_IMQ.h
 806 @@ -0,0 +1,9 @@
 807 +#ifndef _XT_IMQ_H
 808 +#define _XT_IMQ_H
 809 +
 810 +struct xt_imq_info {
 811 +       unsigned int todev;     /* target imq device */
 812 +};
 813 +
 814 +#endif /* _XT_IMQ_H */
 815 +
 816 --- /dev/null
 817 +++ b/include/linux/netfilter_ipv4/ipt_IMQ.h
 818 @@ -0,0 +1,10 @@
 819 +#ifndef _IPT_IMQ_H
 820 +#define _IPT_IMQ_H
 821 +
 822 +/* Backwards compatibility for old userspace */
 823 +#include <linux/netfilter/xt_IMQ.h>
 824 +
 825 +#define ipt_imq_info xt_imq_info
 826 +
 827 +#endif /* _IPT_IMQ_H */
 828 +
 829 --- /dev/null
 830 +++ b/include/linux/netfilter_ipv6/ip6t_IMQ.h
 831 @@ -0,0 +1,10 @@
 832 +#ifndef _IP6T_IMQ_H
 833 +#define _IP6T_IMQ_H
 834 +
 835 +/* Backwards compatibility for old userspace */
 836 +#include <linux/netfilter/xt_IMQ.h>
 837 +
 838 +#define ip6t_imq_info xt_imq_info
 839 +
 840 +#endif /* _IP6T_IMQ_H */
 841 +
 842 --- a/include/linux/skbuff.h
 843 +++ b/include/linux/skbuff.h
 844 @@ -29,6 +29,9 @@
 845  #include <linux/rcupdate.h>
 846  #include <linux/dmaengine.h>
 847  #include <linux/hrtimer.h>
 848 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 849 +#include <linux/imq.h>
 850 +#endif
 851
 852  /* Don't change this without changing skb_csum_unnecessary! */
 853  #define CHECKSUM_NONE 0
 854 @@ -321,6 +324,9 @@ struct sk_buff {
 855          * first. This is owned by whoever has the skb queued ATM.
 856          */
 857         char                    cb[48] __aligned(8);
 858 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 859 +       void                    *cb_next;
 860 +#endif
 861
 862         unsigned long           _skb_dst;
 863  #ifdef CONFIG_XFRM
 864 @@ -357,6 +363,9 @@ struct sk_buff {
 865         struct nf_conntrack     *nfct;
 866         struct sk_buff          *nfct_reasm;
 867  #endif
 868 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 869 +       struct nf_queue_entry   *nf_queue_entry;
 870 +#endif
 871  #ifdef CONFIG_BRIDGE_NETFILTER
 872         struct nf_bridge_info   *nf_bridge;
 873  #endif
 874 @@ -378,6 +387,10 @@ struct sk_buff {
 875
 876         /* 0/14 bit hole */
 877
 878 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 879 +       __u8                    imq_flags:IMQ_F_BITS;
 880 +#endif
 881 +
 882  #ifdef CONFIG_NET_DMA
 883         dma_cookie_t            dma_cookie;
 884  #endif
 885 @@ -426,6 +439,12 @@ static inline struct rtable *skb_rtable(
 886         return (struct rtable *)skb_dst(skb);
 887  }
 888
 889 +
 890 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 891 +extern int skb_save_cb(struct sk_buff *skb);
 892 +extern int skb_restore_cb(struct sk_buff *skb);
 893 +#endif
 894 +
 895  extern void kfree_skb(struct sk_buff *skb);
 896  extern void consume_skb(struct sk_buff *skb);
 897  extern void           __kfree_skb(struct sk_buff *skb);
 898 @@ -1970,6 +1989,10 @@ static inline void __nf_copy(struct sk_b
 899         dst->nfct_reasm = src->nfct_reasm;
 900         nf_conntrack_get_reasm(src->nfct_reasm);
 901  #endif
 902 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 903 +       dst->imq_flags = src->imq_flags;
 904 +       dst->nf_queue_entry = src->nf_queue_entry;
 905 +#endif
 906  #ifdef CONFIG_BRIDGE_NETFILTER
 907         dst->nf_bridge  = src->nf_bridge;
 908         nf_bridge_get(src->nf_bridge);
 909 --- a/include/net/netfilter/nf_queue.h
 910 +++ b/include/net/netfilter/nf_queue.h
 911 @@ -13,6 +13,12 @@ struct nf_queue_entry {
 912         struct net_device       *indev;
 913         struct net_device       *outdev;
 914         int                     (*okfn)(struct sk_buff *);
 915 +
 916 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 917 +       int                     (*next_outfn)(struct nf_queue_entry *entry,
 918 +                                             unsigned int queuenum);
 919 +       unsigned int            next_queuenum;
 920 +#endif
 921  };
 922
 923  #define nf_queue_entry_reroute(x) ((void *)x + sizeof(struct nf_queue_entry))
 924 @@ -30,5 +36,11 @@ extern int nf_unregister_queue_handler(u
 925                                        const struct nf_queue_handler *qh);
 926  extern void nf_unregister_queue_handlers(const struct nf_queue_handler *qh);
 927  extern void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict);
 928 +extern void nf_queue_entry_release_refs(struct nf_queue_entry *entry);
 929 +
 930 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 931 +extern void nf_register_queue_imq_handler(const struct nf_queue_handler *qh);
 932 +extern void nf_unregister_queue_imq_handler(void);
 933 +#endif
 934
 935  #endif /* _NF_QUEUE_H */
 936 --- a/net/core/dev.c
 937 +++ b/net/core/dev.c
 938 @@ -98,6 +98,9 @@
 939  #include <net/net_namespace.h>
 940  #include <net/sock.h>
 941  #include <linux/rtnetlink.h>
 942 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 943 +#include <linux/imq.h>
 944 +#endif
 945  #include <linux/proc_fs.h>
 946  #include <linux/seq_file.h>
 947  #include <linux/stat.h>
 948 @@ -1859,7 +1862,11 @@ int dev_hard_start_xmit(struct sk_buff *
 949         int rc = NETDEV_TX_OK;
 950
 951         if (likely(!skb->next)) {
 952 -               if (!list_empty(&ptype_all))
 953 +               if (!list_empty(&ptype_all)
 954 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 955 +                   && !(skb->imq_flags & IMQ_F_ENQUEUE)
 956 +#endif
 957 +                   )
 958                         dev_queue_xmit_nit(skb, dev);
 959
 960                 if (netif_needs_gso(dev, skb)) {
 961 @@ -1969,8 +1976,7 @@ static inline u16 dev_cap_txqueue(struct
 962         return queue_index;
 963  }
 964
 965 -static struct netdev_queue *dev_pick_tx(struct net_device *dev,
 966 -                                       struct sk_buff *skb)
 967 +struct netdev_queue *dev_pick_tx(struct net_device *dev, struct sk_buff *skb)
 968  {
 969         int queue_index;
 970         struct sock *sk = skb->sk;
 971 @@ -1999,6 +2005,7 @@ static struct netdev_queue *dev_pick_tx(
 972         skb_set_queue_mapping(skb, queue_index);
 973         return netdev_get_tx_queue(dev, queue_index);
 974  }
 975 +EXPORT_SYMBOL(dev_pick_tx);
 976
 977  static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
 978                                  struct net_device *dev,
 979 --- a/net/core/skbuff.c
 980 +++ b/net/core/skbuff.c
 981 @@ -72,6 +72,9 @@
 982
 983  static struct kmem_cache *skbuff_head_cache __read_mostly;
 984  static struct kmem_cache *skbuff_fclone_cache __read_mostly;
 985 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 986 +static struct kmem_cache *skbuff_cb_store_cache __read_mostly;
 987 +#endif
 988
 989  static void sock_pipe_buf_release(struct pipe_inode_info *pipe,
 990                                   struct pipe_buffer *buf)
 991 @@ -91,6 +94,83 @@ static int sock_pipe_buf_steal(struct pi
 992         return 1;
 993  }
 994
 995 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 996 +/* Control buffer save/restore for IMQ devices */
 997 +struct skb_cb_table {
 998 +       void                    *cb_next;
 999 +       atomic_t                refcnt;
1000 +       char                    cb[48];
1001 +};
1002 +
1003 +static DEFINE_SPINLOCK(skb_cb_store_lock);
1004 +
1005 +int skb_save_cb(struct sk_buff *skb)
1006 +{
1007 +       struct skb_cb_table *next;
1008 +
1009 +       next = kmem_cache_alloc(skbuff_cb_store_cache, GFP_ATOMIC);
1010 +       if (!next)
1011 +               return -ENOMEM;
1012 +
1013 +       BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb));
1014 +
1015 +       memcpy(next->cb, skb->cb, sizeof(skb->cb));
1016 +       next->cb_next = skb->cb_next;
1017 +
1018 +       atomic_set(&next->refcnt, 1);
1019 +
1020 +       skb->cb_next = next;
1021 +       return 0;
1022 +}
1023 +EXPORT_SYMBOL(skb_save_cb);
1024 +
1025 +int skb_restore_cb(struct sk_buff *skb)
1026 +{
1027 +       struct skb_cb_table *next;
1028 +
1029 +       if (!skb->cb_next)
1030 +               return 0;
1031 +
1032 +       next = skb->cb_next;
1033 +
1034 +       BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb));
1035 +
1036 +       memcpy(skb->cb, next->cb, sizeof(skb->cb));
1037 +       skb->cb_next = next->cb_next;
1038 +
1039 +       spin_lock(&skb_cb_store_lock);
1040 +
1041 +       if (atomic_dec_and_test(&next->refcnt)) {
1042 +               kmem_cache_free(skbuff_cb_store_cache, next);
1043 +       }
1044 +
1045 +       spin_unlock(&skb_cb_store_lock);
1046 +
1047 +       return 0;
1048 +}
1049 +EXPORT_SYMBOL(skb_restore_cb);
1050 +
1051 +static void skb_copy_stored_cb(struct sk_buff *new, const struct sk_buff *__old)
1052 +{
1053 +       struct skb_cb_table *next;
1054 +       struct sk_buff *old;
1055 +
1056 +       if (!__old->cb_next) {
1057 +               new->cb_next = NULL;
1058 +               return;
1059 +       }
1060 +
1061 +       spin_lock(&skb_cb_store_lock);
1062 +
1063 +       old = (struct sk_buff *)__old;
1064 +
1065 +       next = old->cb_next;
1066 +       atomic_inc(&next->refcnt);
1067 +       new->cb_next = next;
1068 +
1069 +       spin_unlock(&skb_cb_store_lock);
1070 +}
1071 +#endif
1072
1073  /* Pipe buffer operations for a socket. */
1074  static const struct pipe_buf_operations sock_pipe_buf_ops = {
1075 @@ -398,6 +478,26 @@ static void skb_release_head_state(struc
1076                 WARN_ON(in_irq());
1077                 skb->destructor(skb);
1078         }
1079 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1080 +       /* This should not happen. When it does, avoid memleak by restoring
1081 +       the chain of cb-backups. */
1082 +       while(skb->cb_next != NULL) {
1083 +               if (net_ratelimit())
1084 +                       printk(KERN_WARNING "IMQ: kfree_skb: skb->cb_next: "
1085 +                               "%08x\n", (unsigned int)skb->cb_next);
1086 +
1087 +               skb_restore_cb(skb);
1088 +       }
1089 +       /* This should not happen either, nf_queue_entry is nullified in
1090 +        * imq_dev_xmit(). If we have non-NULL nf_queue_entry then we are
1091 +        * leaking entry pointers, maybe memory. We don't know if this is
1092 +        * pointer to already freed memory, or should this be freed.
1093 +        * If this happens we need to add refcounting, etc for nf_queue_entry.
1094 +        */
1095 +       if (skb->nf_queue_entry && net_ratelimit())
1096 +               printk(KERN_WARNING
1097 +                               "IMQ: kfree_skb: skb->nf_queue_entry != NULL");
1098 +#endif
1099  #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1100         nf_conntrack_put(skb->nfct);
1101         nf_conntrack_put_reasm(skb->nfct_reasm);
1102 @@ -538,6 +638,9 @@ static void __copy_skb_header(struct sk_
1103         new->sp                 = secpath_get(old->sp);
1104  #endif
1105         memcpy(new->cb, old->cb, sizeof(old->cb));
1106 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1107 +       skb_copy_stored_cb(new, old);
1108 +#endif
1109         new->csum               = old->csum;
1110         new->local_df           = old->local_df;
1111         new->pkt_type           = old->pkt_type;
1112 @@ -2780,6 +2883,13 @@ void __init skb_init(void)
1113                                                 0,
1114                                                 SLAB_HWCACHE_ALIGN|SLAB_PANIC,
1115                                                 NULL);
1116 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1117 +       skbuff_cb_store_cache = kmem_cache_create("skbuff_cb_store_cache",
1118 +                                                 sizeof(struct skb_cb_table),
1119 +                                                 0,
1120 +                                                 SLAB_HWCACHE_ALIGN|SLAB_PANIC,
1121 +                                                 NULL);
1122 +#endif
1123  }
1124
1125  /**
1126 --- a/net/netfilter/Kconfig
1127 +++ b/net/netfilter/Kconfig
1128 @@ -421,6 +421,18 @@ config NETFILTER_XT_TARGET_LED
1129           For more information on the LEDs available on your system, see
1130           Documentation/leds-class.txt
1131
1132 +config NETFILTER_XT_TARGET_IMQ
1133 +        tristate '"IMQ" target support'
1134 +       depends on NETFILTER_XTABLES
1135 +       depends on IP_NF_MANGLE || IP6_NF_MANGLE
1136 +       select IMQ
1137 +       default m if NETFILTER_ADVANCED=n
1138 +        help
1139 +          This option adds a `IMQ' target which is used to specify if and
1140 +          to which imq device packets should get enqueued/dequeued.
1141 +
1142 +          To compile it as a module, choose M here.  If unsure, say N.
1143 +
1144  config NETFILTER_XT_TARGET_MARK
1145         tristate '"MARK" target support'
1146         default m if NETFILTER_ADVANCED=n
1147 --- a/net/netfilter/Makefile
1148 +++ b/net/netfilter/Makefile
1149 @@ -47,6 +47,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSEC
1150  obj-$(CONFIG_NETFILTER_XT_TARGET_CT) += xt_CT.o
1151  obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o
1152  obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o
1153 +obj-$(CONFIG_NETFILTER_XT_TARGET_IMQ) += xt_IMQ.o
1154  obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o
1155  obj-$(CONFIG_NETFILTER_XT_TARGET_MARK) += xt_MARK.o
1156  obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o
1157 --- a/net/netfilter/nf_queue.c
1158 +++ b/net/netfilter/nf_queue.c
1159 @@ -21,6 +21,26 @@ static const struct nf_queue_handler *qu
1160
1161  static DEFINE_MUTEX(queue_handler_mutex);
1162
1163 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1164 +static const struct nf_queue_handler *queue_imq_handler;
1165 +
1166 +void nf_register_queue_imq_handler(const struct nf_queue_handler *qh)
1167 +{
1168 +       mutex_lock(&queue_handler_mutex);
1169 +       rcu_assign_pointer(queue_imq_handler, qh);
1170 +       mutex_unlock(&queue_handler_mutex);
1171 +}
1172 +EXPORT_SYMBOL(nf_register_queue_imq_handler);
1173 +
1174 +void nf_unregister_queue_imq_handler(void)
1175 +{
1176 +       mutex_lock(&queue_handler_mutex);
1177 +       rcu_assign_pointer(queue_imq_handler, NULL);
1178 +       mutex_unlock(&queue_handler_mutex);
1179 +}
1180 +EXPORT_SYMBOL(nf_unregister_queue_imq_handler);
1181 +#endif
1182 +
1183  /* return EBUSY when somebody else is registered, return EEXIST if the
1184   * same handler is registered, return 0 in case of success. */
1185  int nf_register_queue_handler(u_int8_t pf, const struct nf_queue_handler *qh)
1186 @@ -81,7 +101,7 @@ void nf_unregister_queue_handlers(const
1187  }
1188  EXPORT_SYMBOL_GPL(nf_unregister_queue_handlers);
1189
1190 -static void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
1191 +void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
1192  {
1193         /* Release those devices we held, or Alexey will kill me. */
1194         if (entry->indev)
1195 @@ -101,6 +121,7 @@ static void nf_queue_entry_release_refs(
1196         /* Drop reference to owner of hook which queued us. */
1197         module_put(entry->elem->owner);
1198  }
1199 +EXPORT_SYMBOL_GPL(nf_queue_entry_release_refs);
1200
1201  /*
1202   * Any packet that leaves via this function must come back
1203 @@ -122,12 +143,26 @@ static int __nf_queue(struct sk_buff *sk
1204  #endif
1205         const struct nf_afinfo *afinfo;
1206         const struct nf_queue_handler *qh;
1207 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1208 +       const struct nf_queue_handler *qih = NULL;
1209 +#endif
1210
1211         /* QUEUE == DROP if noone is waiting, to be safe. */
1212         rcu_read_lock();
1213
1214         qh = rcu_dereference(queue_handler[pf]);
1215 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1216 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1217 +       if (pf == PF_INET || pf == PF_INET6)
1218 +#else
1219 +       if (pf == PF_INET)
1220 +#endif
1221 +               qih = rcu_dereference(queue_imq_handler);
1222 +
1223 +       if (!qh && !qih)
1224 +#else /* !IMQ */
1225         if (!qh)
1226 +#endif
1227                 goto err_unlock;
1228
1229         afinfo = nf_get_afinfo(pf);
1230 @@ -146,6 +181,10 @@ static int __nf_queue(struct sk_buff *sk
1231                 .indev  = indev,
1232                 .outdev = outdev,
1233                 .okfn   = okfn,
1234 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1235 +               .next_outfn = qh ? qh->outfn : NULL,
1236 +               .next_queuenum = queuenum,
1237 +#endif
1238         };
1239
1240         /* If it's going away, ignore hook. */
1241 @@ -171,8 +210,19 @@ static int __nf_queue(struct sk_buff *sk
1242         }
1243  #endif
1244         afinfo->saveroute(skb, entry);
1245 +
1246 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1247 +       if (qih) {
1248 +               status = qih->outfn(entry, queuenum);
1249 +               goto imq_skip_queue;
1250 +       }
1251 +#endif
1252 +
1253         status = qh->outfn(entry, queuenum);
1254
1255 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1256 +imq_skip_queue:
1257 +#endif
1258         rcu_read_unlock();
1259
1260         if (status < 0) {
1261 --- /dev/null
1262 +++ b/net/netfilter/xt_IMQ.c
1263 @@ -0,0 +1,73 @@
1264 +/*
1265 + * This target marks packets to be enqueued to an imq device
1266 + */
1267 +#include <linux/module.h>
1268 +#include <linux/skbuff.h>
1269 +#include <linux/netfilter/x_tables.h>
1270 +#include <linux/netfilter/xt_IMQ.h>
1271 +#include <linux/imq.h>
1272 +
1273 +static unsigned int imq_target(struct sk_buff *pskb,
1274 +                               const struct xt_target_param *par)
1275 +{
1276 +       const struct xt_imq_info *mr = par->targinfo;
1277 +
1278 +       pskb->imq_flags = (mr->todev & IMQ_F_IFMASK) | IMQ_F_ENQUEUE;
1279 +
1280 +       return XT_CONTINUE;
1281 +}
1282 +
1283 +static bool imq_checkentry(const struct xt_tgchk_param *par)
1284 +{
1285 +       struct xt_imq_info *mr = par->targinfo;
1286 +
1287 +       if (mr->todev > IMQ_MAX_DEVS - 1) {
1288 +               printk(KERN_WARNING
1289 +                      "IMQ: invalid device specified, highest is %u\n",
1290 +                      IMQ_MAX_DEVS - 1);
1291 +               return 0;
1292 +       }
1293 +
1294 +       return 1;
1295 +}
1296 +
1297 +static struct xt_target xt_imq_reg[] __read_mostly = {
1298 +       {
1299 +               .name           = "IMQ",
1300 +               .family         = AF_INET,
1301 +               .checkentry     = imq_checkentry,
1302 +               .target         = imq_target,
1303 +               .targetsize     = sizeof(struct xt_imq_info),
1304 +               .table          = "mangle",
1305 +               .me             = THIS_MODULE
1306 +       },
1307 +       {
1308 +               .name           = "IMQ",
1309 +               .family         = AF_INET6,
1310 +               .checkentry     = imq_checkentry,
1311 +               .target         = imq_target,
1312 +               .targetsize     = sizeof(struct xt_imq_info),
1313 +               .table          = "mangle",
1314 +               .me             = THIS_MODULE
1315 +       },
1316 +};
1317 +
1318 +static int __init imq_init(void)
1319 +{
1320 +       return xt_register_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg));
1321 +}
1322 +
1323 +static void __exit imq_fini(void)
1324 +{
1325 +       xt_unregister_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg));
1326 +}
1327 +
1328 +module_init(imq_init);
1329 +module_exit(imq_fini);
1330 +
1331 +MODULE_AUTHOR("http://www.linuximq.net");
1332 +MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See http://www.linuximq.net/ for more information.");
1333 +MODULE_LICENSE("GPL");
1334 +MODULE_ALIAS("ipt_IMQ");
1335 +MODULE_ALIAS("ip6t_IMQ");
1336 +