target/linux/generic/patches-2.6.37/150-netfilter_imq.patch

   1 --- /dev/null
   2 +++ b/drivers/net/imq.c
   3 @@ -0,0 +1,638 @@
   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 + *             2010/02/25 - (Jussi Kivilinna)
  86 + *              - Port to 2.6.33
  87 + *
  88 + *             2010/08/12 - (Jussi Kivilinna)
  89 + *              - Port to 2.6.35
  90 + *
  91 + *            Also, many thanks to pablo Sebastian Greco for making the initial
  92 + *            patch and to those who helped the testing.
  93 + *
  94 + *             More info at: http://www.linuximq.net/ (Andre Correa)
  95 + */
  96 +
  97 +#include <linux/module.h>
  98 +#include <linux/kernel.h>
  99 +#include <linux/moduleparam.h>
 100 +#include <linux/list.h>
 101 +#include <linux/skbuff.h>
 102 +#include <linux/netdevice.h>
 103 +#include <linux/etherdevice.h>
 104 +#include <linux/rtnetlink.h>
 105 +#include <linux/if_arp.h>
 106 +#include <linux/netfilter.h>
 107 +#include <linux/netfilter_ipv4.h>
 108 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 109 +       #include <linux/netfilter_ipv6.h>
 110 +#endif
 111 +#include <linux/imq.h>
 112 +#include <net/pkt_sched.h>
 113 +#include <net/netfilter/nf_queue.h>
 114 +
 115 +static nf_hookfn imq_nf_hook;
 116 +
 117 +static struct nf_hook_ops imq_ingress_ipv4 = {
 118 +       .hook           = imq_nf_hook,
 119 +       .owner          = THIS_MODULE,
 120 +       .pf             = PF_INET,
 121 +       .hooknum        = NF_INET_PRE_ROUTING,
 122 +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 123 +       .priority       = NF_IP_PRI_MANGLE + 1
 124 +#else
 125 +       .priority       = NF_IP_PRI_NAT_DST + 1
 126 +#endif
 127 +};
 128 +
 129 +static struct nf_hook_ops imq_egress_ipv4 = {
 130 +       .hook           = imq_nf_hook,
 131 +       .owner          = THIS_MODULE,
 132 +       .pf             = PF_INET,
 133 +       .hooknum        = NF_INET_POST_ROUTING,
 134 +#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA)
 135 +       .priority       = NF_IP_PRI_LAST
 136 +#else
 137 +       .priority       = NF_IP_PRI_NAT_SRC - 1
 138 +#endif
 139 +};
 140 +
 141 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 142 +static struct nf_hook_ops imq_ingress_ipv6 = {
 143 +       .hook           = imq_nf_hook,
 144 +       .owner          = THIS_MODULE,
 145 +       .pf             = PF_INET6,
 146 +       .hooknum        = NF_INET_PRE_ROUTING,
 147 +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 148 +       .priority       = NF_IP6_PRI_MANGLE + 1
 149 +#else
 150 +       .priority       = NF_IP6_PRI_NAT_DST + 1
 151 +#endif
 152 +};
 153 +
 154 +static struct nf_hook_ops imq_egress_ipv6 = {
 155 +       .hook           = imq_nf_hook,
 156 +       .owner          = THIS_MODULE,
 157 +       .pf             = PF_INET6,
 158 +       .hooknum        = NF_INET_POST_ROUTING,
 159 +#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA)
 160 +       .priority       = NF_IP6_PRI_LAST
 161 +#else
 162 +       .priority       = NF_IP6_PRI_NAT_SRC - 1
 163 +#endif
 164 +};
 165 +#endif
 166 +
 167 +#if defined(CONFIG_IMQ_NUM_DEVS)
 168 +static unsigned int numdevs = CONFIG_IMQ_NUM_DEVS;
 169 +#else
 170 +static unsigned int numdevs = IMQ_MAX_DEVS;
 171 +#endif
 172 +
 173 +static DEFINE_SPINLOCK(imq_nf_queue_lock);
 174 +
 175 +static struct net_device *imq_devs_cache[IMQ_MAX_DEVS];
 176 +
 177 +
 178 +static struct net_device_stats *imq_get_stats(struct net_device *dev)
 179 +{
 180 +       return &dev->stats;
 181 +}
 182 +
 183 +/* called for packets kfree'd in qdiscs at places other than enqueue */
 184 +static void imq_skb_destructor(struct sk_buff *skb)
 185 +{
 186 +       struct nf_queue_entry *entry = skb->nf_queue_entry;
 187 +
 188 +       skb->nf_queue_entry = NULL;
 189 +
 190 +       if (entry) {
 191 +               nf_queue_entry_release_refs(entry);
 192 +               kfree(entry);
 193 +       }
 194 +
 195 +       skb_restore_cb(skb); /* kfree backup */
 196 +}
 197 +
 198 +/* locking not needed when called from imq_nf_queue */
 199 +static void imq_nf_reinject_lockless(struct nf_queue_entry *entry,
 200 +                                               unsigned int verdict)
 201 +{
 202 +       int status;
 203 +
 204 +       if (!entry->next_outfn) {
 205 +               nf_reinject(entry, verdict);
 206 +               return;
 207 +       }
 208 +
 209 +       status = entry->next_outfn(entry, entry->next_queuenum);
 210 +       if (status < 0) {
 211 +               nf_queue_entry_release_refs(entry);
 212 +               kfree_skb(entry->skb);
 213 +               kfree(entry);
 214 +       }
 215 +}
 216 +
 217 +static void imq_nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
 218 +{
 219 +       int status;
 220 +
 221 +       if (!entry->next_outfn) {
 222 +               spin_lock_bh(&imq_nf_queue_lock);
 223 +               nf_reinject(entry, verdict);
 224 +               spin_unlock_bh(&imq_nf_queue_lock);
 225 +               return;
 226 +       }
 227 +
 228 +       rcu_read_lock();
 229 +       local_bh_disable();
 230 +       status = entry->next_outfn(entry, entry->next_queuenum);
 231 +       local_bh_enable();
 232 +       if (status < 0) {
 233 +               nf_queue_entry_release_refs(entry);
 234 +               kfree_skb(entry->skb);
 235 +               kfree(entry);
 236 +       }
 237 +
 238 +       rcu_read_unlock();
 239 +}
 240 +
 241 +static netdev_tx_t imq_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 242 +{
 243 +       struct nf_queue_entry *entry = skb->nf_queue_entry;
 244 +
 245 +       skb->nf_queue_entry = NULL;
 246 +       dev->trans_start = jiffies;
 247 +
 248 +       dev->stats.tx_bytes += skb->len;
 249 +       dev->stats.tx_packets++;
 250 +
 251 +       if (entry == NULL) {
 252 +               /* We don't know what is going on here.. packet is queued for
 253 +                * imq device, but (probably) not by us.
 254 +                *
 255 +                * If this packet was not send here by imq_nf_queue(), then
 256 +                * skb_save_cb() was not used and skb_free() should not show:
 257 +                *   WARNING: IMQ: kfree_skb: skb->cb_next:..
 258 +                * and/or
 259 +                *   WARNING: IMQ: kfree_skb: skb->nf_queue_entry...
 260 +                *
 261 +                * However if this message is shown, then IMQ is somehow broken
 262 +                * and you should report this to linuximq.net.
 263 +                */
 264 +
 265 +               /* imq_dev_xmit is black hole that eats all packets, report that
 266 +                * we eat this packet happily and increase dropped counters.
 267 +                */
 268 +
 269 +               dev->stats.tx_dropped++;
 270 +               dev_kfree_skb(skb);
 271 +
 272 +               return NETDEV_TX_OK;
 273 +       }
 274 +
 275 +       skb_restore_cb(skb); /* restore skb->cb */
 276 +
 277 +       skb->imq_flags = 0;
 278 +       skb->destructor = NULL;
 279 +
 280 +       imq_nf_reinject(entry, NF_ACCEPT);
 281 +
 282 +       return NETDEV_TX_OK;
 283 +}
 284 +
 285 +static int imq_nf_queue(struct nf_queue_entry *entry, unsigned queue_num)
 286 +{
 287 +       struct net_device *dev;
 288 +       struct sk_buff *skb_orig, *skb, *skb_shared;
 289 +       struct Qdisc *q;
 290 +       struct netdev_queue *txq;
 291 +       int users, index;
 292 +       int retval = -EINVAL;
 293 +
 294 +       index = entry->skb->imq_flags & IMQ_F_IFMASK;
 295 +       if (unlikely(index > numdevs - 1)) {
 296 +               if (net_ratelimit())
 297 +                       printk(KERN_WARNING
 298 +                              "IMQ: invalid device specified, highest is %u\n",
 299 +                              numdevs - 1);
 300 +               retval = -EINVAL;
 301 +               goto out;
 302 +       }
 303 +
 304 +       /* check for imq device by index from cache */
 305 +       dev = imq_devs_cache[index];
 306 +       if (unlikely(!dev)) {
 307 +               char buf[8];
 308 +
 309 +               /* get device by name and cache result */
 310 +               snprintf(buf, sizeof(buf), "imq%d", index);
 311 +               dev = dev_get_by_name(&init_net, buf);
 312 +               if (!dev) {
 313 +                       /* not found ?!*/
 314 +                       BUG();
 315 +                       retval = -ENODEV;
 316 +                       goto out;
 317 +               }
 318 +
 319 +               imq_devs_cache[index] = dev;
 320 +               dev_put(dev);
 321 +       }
 322 +
 323 +       if (unlikely(!(dev->flags & IFF_UP))) {
 324 +               entry->skb->imq_flags = 0;
 325 +               imq_nf_reinject_lockless(entry, NF_ACCEPT);
 326 +               retval = 0;
 327 +               goto out;
 328 +       }
 329 +       dev->last_rx = jiffies;
 330 +
 331 +       skb = entry->skb;
 332 +       skb_orig = NULL;
 333 +
 334 +       /* skb has owner? => make clone */
 335 +       if (unlikely(skb->destructor)) {
 336 +               skb_orig = skb;
 337 +               skb = skb_clone(skb, GFP_ATOMIC);
 338 +               if (!skb) {
 339 +                       retval = -ENOMEM;
 340 +                       goto out;
 341 +               }
 342 +               entry->skb = skb;
 343 +       }
 344 +
 345 +       skb->nf_queue_entry = entry;
 346 +
 347 +       dev->stats.rx_bytes += skb->len;
 348 +       dev->stats.rx_packets++;
 349 +
 350 +       txq = dev_pick_tx(dev, skb);
 351 +
 352 +       q = rcu_dereference(txq->qdisc);
 353 +       if (unlikely(!q->enqueue))
 354 +               goto packet_not_eaten_by_imq_dev;
 355 +
 356 +       spin_lock_bh(qdisc_lock(q));
 357 +
 358 +       users = atomic_read(&skb->users);
 359 +
 360 +       skb_shared = skb_get(skb); /* increase reference count by one */
 361 +       skb_save_cb(skb_shared); /* backup skb->cb, as qdisc layer will
 362 +                                       overwrite it */
 363 +       qdisc_enqueue_root(skb_shared, q); /* might kfree_skb */
 364 +
 365 +       if (likely(atomic_read(&skb_shared->users) == users + 1)) {
 366 +               kfree_skb(skb_shared); /* decrease reference count by one */
 367 +
 368 +               skb->destructor = &imq_skb_destructor;
 369 +
 370 +               /* cloned? */
 371 +               if (skb_orig)
 372 +                       kfree_skb(skb_orig); /* free original */
 373 +
 374 +               spin_unlock_bh(qdisc_lock(q));
 375 +
 376 +               /* schedule qdisc dequeue */
 377 +               __netif_schedule(q);
 378 +
 379 +               retval = 0;
 380 +               goto out;
 381 +       } else {
 382 +               skb_restore_cb(skb_shared); /* restore skb->cb */
 383 +               skb->nf_queue_entry = NULL;
 384 +               /* qdisc dropped packet and decreased skb reference count of
 385 +                * skb, so we don't really want to and try refree as that would
 386 +                * actually destroy the skb. */
 387 +               spin_unlock_bh(qdisc_lock(q));
 388 +               goto packet_not_eaten_by_imq_dev;
 389 +       }
 390 +
 391 +packet_not_eaten_by_imq_dev:
 392 +       /* cloned? restore original */
 393 +       if (skb_orig) {
 394 +               kfree_skb(skb);
 395 +               entry->skb = skb_orig;
 396 +       }
 397 +       retval = -1;
 398 +out:
 399 +       return retval;
 400 +}
 401 +
 402 +static struct nf_queue_handler nfqh = {
 403 +       .name  = "imq",
 404 +       .outfn = imq_nf_queue,
 405 +};
 406 +
 407 +static unsigned int imq_nf_hook(unsigned int hook, struct sk_buff *pskb,
 408 +                               const struct net_device *indev,
 409 +                               const struct net_device *outdev,
 410 +                               int (*okfn)(struct sk_buff *))
 411 +{
 412 +       if (pskb->imq_flags & IMQ_F_ENQUEUE)
 413 +               return NF_QUEUE;
 414 +
 415 +       return NF_ACCEPT;
 416 +}
 417 +
 418 +static int imq_close(struct net_device *dev)
 419 +{
 420 +       netif_stop_queue(dev);
 421 +       return 0;
 422 +}
 423 +
 424 +static int imq_open(struct net_device *dev)
 425 +{
 426 +       netif_start_queue(dev);
 427 +       return 0;
 428 +}
 429 +
 430 +static const struct net_device_ops imq_netdev_ops = {
 431 +       .ndo_open               = imq_open,
 432 +       .ndo_stop               = imq_close,
 433 +       .ndo_start_xmit         = imq_dev_xmit,
 434 +       .ndo_get_stats          = imq_get_stats,
 435 +};
 436 +
 437 +static void imq_setup(struct net_device *dev)
 438 +{
 439 +       dev->netdev_ops         = &imq_netdev_ops;
 440 +       dev->type               = ARPHRD_VOID;
 441 +       dev->mtu                = 16000;
 442 +       dev->tx_queue_len       = 11000;
 443 +       dev->flags              = IFF_NOARP;
 444 +       dev->features           = NETIF_F_SG | NETIF_F_FRAGLIST |
 445 +                                 NETIF_F_GSO | NETIF_F_HW_CSUM |
 446 +                                 NETIF_F_HIGHDMA;
 447 +       dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
 448 +}
 449 +
 450 +static int imq_validate(struct nlattr *tb[], struct nlattr *data[])
 451 +{
 452 +       int ret = 0;
 453 +
 454 +       if (tb[IFLA_ADDRESS]) {
 455 +               if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
 456 +                       ret = -EINVAL;
 457 +                       goto end;
 458 +               }
 459 +               if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
 460 +                       ret = -EADDRNOTAVAIL;
 461 +                       goto end;
 462 +               }
 463 +       }
 464 +       return 0;
 465 +end:
 466 +       printk(KERN_WARNING "IMQ: imq_validate failed (%d)\n", ret);
 467 +       return ret;
 468 +}
 469 +
 470 +static struct rtnl_link_ops imq_link_ops __read_mostly = {
 471 +       .kind           = "imq",
 472 +       .priv_size      = 0,
 473 +       .setup          = imq_setup,
 474 +       .validate       = imq_validate,
 475 +};
 476 +
 477 +static int __init imq_init_hooks(void)
 478 +{
 479 +       int err;
 480 +
 481 +       nf_register_queue_imq_handler(&nfqh);
 482 +
 483 +       err = nf_register_hook(&imq_ingress_ipv4);
 484 +       if (err)
 485 +               goto err1;
 486 +
 487 +       err = nf_register_hook(&imq_egress_ipv4);
 488 +       if (err)
 489 +               goto err2;
 490 +
 491 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 492 +       err = nf_register_hook(&imq_ingress_ipv6);
 493 +       if (err)
 494 +               goto err3;
 495 +
 496 +       err = nf_register_hook(&imq_egress_ipv6);
 497 +       if (err)
 498 +               goto err4;
 499 +#endif
 500 +
 501 +       return 0;
 502 +
 503 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 504 +err4:
 505 +       nf_unregister_hook(&imq_ingress_ipv6);
 506 +err3:
 507 +       nf_unregister_hook(&imq_egress_ipv4);
 508 +#endif
 509 +err2:
 510 +       nf_unregister_hook(&imq_ingress_ipv4);
 511 +err1:
 512 +       nf_unregister_queue_imq_handler();
 513 +       return err;
 514 +}
 515 +
 516 +static int __init imq_init_one(int index)
 517 +{
 518 +       struct net_device *dev;
 519 +       int ret;
 520 +
 521 +       dev = alloc_netdev(0, "imq%d", imq_setup);
 522 +       if (!dev)
 523 +               return -ENOMEM;
 524 +
 525 +       ret = dev_alloc_name(dev, dev->name);
 526 +       if (ret < 0)
 527 +               goto fail;
 528 +
 529 +       dev->rtnl_link_ops = &imq_link_ops;
 530 +       ret = register_netdevice(dev);
 531 +       if (ret < 0)
 532 +               goto fail;
 533 +
 534 +       return 0;
 535 +fail:
 536 +       free_netdev(dev);
 537 +       return ret;
 538 +}
 539 +
 540 +static int __init imq_init_devs(void)
 541 +{
 542 +       int err, i;
 543 +
 544 +       if (numdevs < 1 || numdevs > IMQ_MAX_DEVS) {
 545 +               printk(KERN_ERR "IMQ: numdevs has to be betweed 1 and %u\n",
 546 +                      IMQ_MAX_DEVS);
 547 +               return -EINVAL;
 548 +       }
 549 +
 550 +       rtnl_lock();
 551 +       err = __rtnl_link_register(&imq_link_ops);
 552 +
 553 +       for (i = 0; i < numdevs && !err; i++)
 554 +               err = imq_init_one(i);
 555 +
 556 +       if (err) {
 557 +               __rtnl_link_unregister(&imq_link_ops);
 558 +               memset(imq_devs_cache, 0, sizeof(imq_devs_cache));
 559 +       }
 560 +       rtnl_unlock();
 561 +
 562 +       return err;
 563 +}
 564 +
 565 +static int __init imq_init_module(void)
 566 +{
 567 +       int err;
 568 +
 569 +#if defined(CONFIG_IMQ_NUM_DEVS)
 570 +       BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS > 16);
 571 +       BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS < 2);
 572 +       BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS - 1 > IMQ_F_IFMASK);
 573 +#endif
 574 +
 575 +       err = imq_init_devs();
 576 +       if (err) {
 577 +               printk(KERN_ERR "IMQ: Error trying imq_init_devs(net)\n");
 578 +               return err;
 579 +       }
 580 +
 581 +       err = imq_init_hooks();
 582 +       if (err) {
 583 +               printk(KERN_ERR "IMQ: Error trying imq_init_hooks()\n");
 584 +               rtnl_link_unregister(&imq_link_ops);
 585 +               memset(imq_devs_cache, 0, sizeof(imq_devs_cache));
 586 +               return err;
 587 +       }
 588 +
 589 +       printk(KERN_INFO "IMQ driver loaded successfully.\n");
 590 +
 591 +#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 592 +       printk(KERN_INFO "\tHooking IMQ before NAT on PREROUTING.\n");
 593 +#else
 594 +       printk(KERN_INFO "\tHooking IMQ after NAT on PREROUTING.\n");
 595 +#endif
 596 +#if defined(CONFIG_IMQ_BEHAVIOR_AB) || defined(CONFIG_IMQ_BEHAVIOR_BB)
 597 +       printk(KERN_INFO "\tHooking IMQ before NAT on POSTROUTING.\n");
 598 +#else
 599 +       printk(KERN_INFO "\tHooking IMQ after NAT on POSTROUTING.\n");
 600 +#endif
 601 +
 602 +       return 0;
 603 +}
 604 +
 605 +static void __exit imq_unhook(void)
 606 +{
 607 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 608 +       nf_unregister_hook(&imq_ingress_ipv6);
 609 +       nf_unregister_hook(&imq_egress_ipv6);
 610 +#endif
 611 +       nf_unregister_hook(&imq_ingress_ipv4);
 612 +       nf_unregister_hook(&imq_egress_ipv4);
 613 +
 614 +       nf_unregister_queue_imq_handler();
 615 +}
 616 +
 617 +static void __exit imq_cleanup_devs(void)
 618 +{
 619 +       rtnl_link_unregister(&imq_link_ops);
 620 +       memset(imq_devs_cache, 0, sizeof(imq_devs_cache));
 621 +}
 622 +
 623 +static void __exit imq_exit_module(void)
 624 +{
 625 +       imq_unhook();
 626 +       imq_cleanup_devs();
 627 +       printk(KERN_INFO "IMQ driver unloaded successfully.\n");
 628 +}
 629 +
 630 +module_init(imq_init_module);
 631 +module_exit(imq_exit_module);
 632 +
 633 +module_param(numdevs, int, 0);
 634 +MODULE_PARM_DESC(numdevs, "number of IMQ devices (how many imq* devices will "
 635 +                       "be created)");
 636 +MODULE_AUTHOR("http://www.linuximq.net");
 637 +MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See "
 638 +                       "http://www.linuximq.net/ for more information.");
 639 +MODULE_LICENSE("GPL");
 640 +MODULE_ALIAS_RTNL_LINK("imq");
 641 +
 642 --- a/drivers/net/Kconfig
 643 +++ b/drivers/net/Kconfig
 644 @@ -124,6 +124,129 @@ config EQUALIZER
 645           To compile this driver as a module, choose M here: the module
 646           will be called eql.  If unsure, say N.
 647
 648 +config IMQ
 649 +       tristate "IMQ (intermediate queueing device) support"
 650 +       depends on NETDEVICES && NETFILTER
 651 +       ---help---
 652 +         The IMQ device(s) is used as placeholder for QoS queueing
 653 +         disciplines. Every packet entering/leaving the IP stack can be
 654 +         directed through the IMQ device where it's enqueued/dequeued to the
 655 +         attached qdisc. This allows you to treat network devices as classes
 656 +         and distribute bandwidth among them. Iptables is used to specify
 657 +         through which IMQ device, if any, packets travel.
 658 +
 659 +         More information at: http://www.linuximq.net/
 660 +
 661 +         To compile this driver as a module, choose M here: the module
 662 +         will be called imq.  If unsure, say N.
 663 +
 664 +choice
 665 +       prompt "IMQ behavior (PRE/POSTROUTING)"
 666 +       depends on IMQ
 667 +       default IMQ_BEHAVIOR_AB
 668 +       help
 669 +
 670 +               This settings defines how IMQ behaves in respect to its
 671 +               hooking in PREROUTING and POSTROUTING.
 672 +
 673 +               IMQ can work in any of the following ways:
 674 +
 675 +                   PREROUTING   |      POSTROUTING
 676 +               -----------------|-------------------
 677 +               #1  After NAT    |      After NAT
 678 +               #2  After NAT    |      Before NAT
 679 +               #3  Before NAT   |      After NAT
 680 +               #4  Before NAT   |      Before NAT
 681 +
 682 +               The default behavior is to hook before NAT on PREROUTING
 683 +               and after NAT on POSTROUTING (#3).
 684 +
 685 +               This settings are specially usefull when trying to use IMQ
 686 +               to shape NATed clients.
 687 +
 688 +               More information can be found at: www.linuximq.net
 689 +
 690 +               If not sure leave the default settings alone.
 691 +
 692 +config IMQ_BEHAVIOR_AA
 693 +       bool "IMQ AA"
 694 +       help
 695 +               This settings defines how IMQ behaves in respect to its
 696 +               hooking in PREROUTING and POSTROUTING.
 697 +
 698 +               Choosing this option will make IMQ hook like this:
 699 +
 700 +               PREROUTING:   After NAT
 701 +               POSTROUTING:  After NAT
 702 +
 703 +               More information can be found at: www.linuximq.net
 704 +
 705 +               If not sure leave the default settings alone.
 706 +
 707 +config IMQ_BEHAVIOR_AB
 708 +       bool "IMQ AB"
 709 +       help
 710 +               This settings defines how IMQ behaves in respect to its
 711 +               hooking in PREROUTING and POSTROUTING.
 712 +
 713 +               Choosing this option will make IMQ hook like this:
 714 +
 715 +               PREROUTING:   After NAT
 716 +               POSTROUTING:  Before NAT
 717 +
 718 +               More information can be found at: www.linuximq.net
 719 +
 720 +               If not sure leave the default settings alone.
 721 +
 722 +config IMQ_BEHAVIOR_BA
 723 +       bool "IMQ BA"
 724 +       help
 725 +               This settings defines how IMQ behaves in respect to its
 726 +               hooking in PREROUTING and POSTROUTING.
 727 +
 728 +               Choosing this option will make IMQ hook like this:
 729 +
 730 +               PREROUTING:   Before NAT
 731 +               POSTROUTING:  After NAT
 732 +
 733 +               More information can be found at: www.linuximq.net
 734 +
 735 +               If not sure leave the default settings alone.
 736 +
 737 +config IMQ_BEHAVIOR_BB
 738 +       bool "IMQ BB"
 739 +       help
 740 +               This settings defines how IMQ behaves in respect to its
 741 +               hooking in PREROUTING and POSTROUTING.
 742 +
 743 +               Choosing this option will make IMQ hook like this:
 744 +
 745 +               PREROUTING:   Before NAT
 746 +               POSTROUTING:  Before NAT
 747 +
 748 +               More information can be found at: www.linuximq.net
 749 +
 750 +               If not sure leave the default settings alone.
 751 +
 752 +endchoice
 753 +
 754 +config IMQ_NUM_DEVS
 755 +
 756 +       int "Number of IMQ devices"
 757 +       range 2 16
 758 +       depends on IMQ
 759 +       default "16"
 760 +       help
 761 +
 762 +               This settings defines how many IMQ devices will be
 763 +               created.
 764 +
 765 +               The default value is 16.
 766 +
 767 +               More information can be found at: www.linuximq.net
 768 +
 769 +               If not sure leave the default settings alone.
 770 +
 771  config TUN
 772         tristate "Universal TUN/TAP device driver support"
 773         select CRC32
 774 --- a/drivers/net/Makefile
 775 +++ b/drivers/net/Makefile
 776 @@ -173,6 +173,7 @@ obj-$(CONFIG_SLHC) += slhc.o
 777  obj-$(CONFIG_XEN_NETDEV_FRONTEND) += xen-netfront.o
 778
 779  obj-$(CONFIG_DUMMY) += dummy.o
 780 +obj-$(CONFIG_IMQ) += imq.o
 781  obj-$(CONFIG_IFB) += ifb.o
 782  obj-$(CONFIG_MACVLAN) += macvlan.o
 783  obj-$(CONFIG_MACVTAP) += macvtap.o
 784 --- /dev/null
 785 +++ b/include/linux/imq.h
 786 @@ -0,0 +1,13 @@
 787 +#ifndef _IMQ_H
 788 +#define _IMQ_H
 789 +
 790 +/* IFMASK (16 device indexes, 0 to 15) and flag(s) fit in 5 bits */
 791 +#define IMQ_F_BITS     5
 792 +
 793 +#define IMQ_F_IFMASK   0x0f
 794 +#define IMQ_F_ENQUEUE  0x10
 795 +
 796 +#define IMQ_MAX_DEVS   (IMQ_F_IFMASK + 1)
 797 +
 798 +#endif /* _IMQ_H */
 799 +
 800 --- a/include/linux/netdevice.h
 801 +++ b/include/linux/netdevice.h
 802 @@ -1323,6 +1323,7 @@ extern int                dev_alloc_name(struct net_de
 803  extern int             dev_open(struct net_device *dev);
 804  extern int             dev_close(struct net_device *dev);
 805  extern void            dev_disable_lro(struct net_device *dev);
 806 +extern struct netdev_queue *dev_pick_tx(struct net_device *dev, struct sk_buff *skb);
 807  extern int             dev_queue_xmit(struct sk_buff *skb);
 808  extern int             register_netdevice(struct net_device *dev);
 809  extern void            unregister_netdevice_queue(struct net_device *dev,
 810 --- /dev/null
 811 +++ b/include/linux/netfilter/xt_IMQ.h
 812 @@ -0,0 +1,9 @@
 813 +#ifndef _XT_IMQ_H
 814 +#define _XT_IMQ_H
 815 +
 816 +struct xt_imq_info {
 817 +       unsigned int todev;     /* target imq device */
 818 +};
 819 +
 820 +#endif /* _XT_IMQ_H */
 821 +
 822 --- /dev/null
 823 +++ b/include/linux/netfilter_ipv4/ipt_IMQ.h
 824 @@ -0,0 +1,10 @@
 825 +#ifndef _IPT_IMQ_H
 826 +#define _IPT_IMQ_H
 827 +
 828 +/* Backwards compatibility for old userspace */
 829 +#include <linux/netfilter/xt_IMQ.h>
 830 +
 831 +#define ipt_imq_info xt_imq_info
 832 +
 833 +#endif /* _IPT_IMQ_H */
 834 +
 835 --- /dev/null
 836 +++ b/include/linux/netfilter_ipv6/ip6t_IMQ.h
 837 @@ -0,0 +1,10 @@
 838 +#ifndef _IP6T_IMQ_H
 839 +#define _IP6T_IMQ_H
 840 +
 841 +/* Backwards compatibility for old userspace */
 842 +#include <linux/netfilter/xt_IMQ.h>
 843 +
 844 +#define ip6t_imq_info xt_imq_info
 845 +
 846 +#endif /* _IP6T_IMQ_H */
 847 +
 848 --- a/include/linux/skbuff.h
 849 +++ b/include/linux/skbuff.h
 850 @@ -29,6 +29,9 @@
 851  #include <linux/rcupdate.h>
 852  #include <linux/dmaengine.h>
 853  #include <linux/hrtimer.h>
 854 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 855 +#include <linux/imq.h>
 856 +#endif
 857
 858  /* Don't change this without changing skb_csum_unnecessary! */
 859  #define CHECKSUM_NONE 0
 860 @@ -328,6 +331,9 @@ struct sk_buff {
 861          * first. This is owned by whoever has the skb queued ATM.
 862          */
 863         char                    cb[48] __aligned(8);
 864 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 865 +       void                    *cb_next;
 866 +#endif
 867
 868         unsigned long           _skb_refdst;
 869  #ifdef CONFIG_XFRM
 870 @@ -364,6 +370,9 @@ struct sk_buff {
 871         struct nf_conntrack     *nfct;
 872         struct sk_buff          *nfct_reasm;
 873  #endif
 874 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 875 +       struct nf_queue_entry   *nf_queue_entry;
 876 +#endif
 877  #ifdef CONFIG_BRIDGE_NETFILTER
 878         struct nf_bridge_info   *nf_bridge;
 879  #endif
 880 @@ -390,6 +399,10 @@ struct sk_buff {
 881
 882         /* 0/14 bit hole */
 883
 884 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 885 +       __u8                    imq_flags:IMQ_F_BITS;
 886 +#endif
 887 +
 888  #ifdef CONFIG_NET_DMA
 889         dma_cookie_t            dma_cookie;
 890  #endif
 891 @@ -476,6 +489,12 @@ static inline struct rtable *skb_rtable(
 892         return (struct rtable *)skb_dst(skb);
 893  }
 894
 895 +
 896 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 897 +extern int skb_save_cb(struct sk_buff *skb);
 898 +extern int skb_restore_cb(struct sk_buff *skb);
 899 +#endif
 900 +
 901  extern void kfree_skb(struct sk_buff *skb);
 902  extern void consume_skb(struct sk_buff *skb);
 903  extern void           __kfree_skb(struct sk_buff *skb);
 904 @@ -2098,6 +2117,10 @@ static inline void __nf_copy(struct sk_b
 905         dst->nfct_reasm = src->nfct_reasm;
 906         nf_conntrack_get_reasm(src->nfct_reasm);
 907  #endif
 908 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 909 +       dst->imq_flags = src->imq_flags;
 910 +       dst->nf_queue_entry = src->nf_queue_entry;
 911 +#endif
 912  #ifdef CONFIG_BRIDGE_NETFILTER
 913         dst->nf_bridge  = src->nf_bridge;
 914         nf_bridge_get(src->nf_bridge);
 915 --- a/include/net/netfilter/nf_queue.h
 916 +++ b/include/net/netfilter/nf_queue.h
 917 @@ -13,6 +13,12 @@ struct nf_queue_entry {
 918         struct net_device       *indev;
 919         struct net_device       *outdev;
 920         int                     (*okfn)(struct sk_buff *);
 921 +
 922 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 923 +       int                     (*next_outfn)(struct nf_queue_entry *entry,
 924 +                                             unsigned int queuenum);
 925 +       unsigned int            next_queuenum;
 926 +#endif
 927  };
 928
 929  #define nf_queue_entry_reroute(x) ((void *)x + sizeof(struct nf_queue_entry))
 930 @@ -30,5 +36,11 @@ extern int nf_unregister_queue_handler(u
 931                                        const struct nf_queue_handler *qh);
 932  extern void nf_unregister_queue_handlers(const struct nf_queue_handler *qh);
 933  extern void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict);
 934 +extern void nf_queue_entry_release_refs(struct nf_queue_entry *entry);
 935 +
 936 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 937 +extern void nf_register_queue_imq_handler(const struct nf_queue_handler *qh);
 938 +extern void nf_unregister_queue_imq_handler(void);
 939 +#endif
 940
 941  #endif /* _NF_QUEUE_H */
 942 --- a/net/core/dev.c
 943 +++ b/net/core/dev.c
 944 @@ -98,6 +98,9 @@
 945  #include <net/net_namespace.h>
 946  #include <net/sock.h>
 947  #include <linux/rtnetlink.h>
 948 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 949 +#include <linux/imq.h>
 950 +#endif
 951  #include <linux/proc_fs.h>
 952  #include <linux/seq_file.h>
 953  #include <linux/stat.h>
 954 @@ -1995,7 +1998,11 @@ int dev_hard_start_xmit(struct sk_buff *
 955         int rc = NETDEV_TX_OK;
 956
 957         if (likely(!skb->next)) {
 958 -               if (!list_empty(&ptype_all))
 959 +               if (!list_empty(&ptype_all)
 960 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 961 +                       && !(skb->imq_flags & IMQ_F_ENQUEUE)
 962 +#endif
 963 +                  )
 964                         dev_queue_xmit_nit(skb, dev);
 965
 966                 /*
 967 @@ -2119,8 +2126,7 @@ static inline u16 dev_cap_txqueue(struct
 968         return queue_index;
 969  }
 970
 971 -static struct netdev_queue *dev_pick_tx(struct net_device *dev,
 972 -                                       struct sk_buff *skb)
 973 +struct netdev_queue *dev_pick_tx(struct net_device *dev, struct sk_buff *skb)
 974  {
 975         int queue_index;
 976         const struct net_device_ops *ops = dev->netdev_ops;
 977 @@ -2149,6 +2155,7 @@ static struct netdev_queue *dev_pick_tx(
 978         skb_set_queue_mapping(skb, queue_index);
 979         return netdev_get_tx_queue(dev, queue_index);
 980  }
 981 +EXPORT_SYMBOL(dev_pick_tx);
 982
 983  static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
 984                                  struct net_device *dev,
 985 --- a/net/core/skbuff.c
 986 +++ b/net/core/skbuff.c
 987 @@ -72,6 +72,9 @@
 988
 989  static struct kmem_cache *skbuff_head_cache __read_mostly;
 990  static struct kmem_cache *skbuff_fclone_cache __read_mostly;
 991 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
 992 +static struct kmem_cache *skbuff_cb_store_cache __read_mostly;
 993 +#endif
 994
 995  static void sock_pipe_buf_release(struct pipe_inode_info *pipe,
 996                                   struct pipe_buffer *buf)
 997 @@ -91,6 +94,83 @@ static int sock_pipe_buf_steal(struct pi
 998         return 1;
 999  }
1000
1001 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1002 +/* Control buffer save/restore for IMQ devices */
1003 +struct skb_cb_table {
1004 +       void                    *cb_next;
1005 +       atomic_t                refcnt;
1006 +       char                    cb[48];
1007 +};
1008 +
1009 +static DEFINE_SPINLOCK(skb_cb_store_lock);
1010 +
1011 +int skb_save_cb(struct sk_buff *skb)
1012 +{
1013 +       struct skb_cb_table *next;
1014 +
1015 +       next = kmem_cache_alloc(skbuff_cb_store_cache, GFP_ATOMIC);
1016 +       if (!next)
1017 +               return -ENOMEM;
1018 +
1019 +       BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb));
1020 +
1021 +       memcpy(next->cb, skb->cb, sizeof(skb->cb));
1022 +       next->cb_next = skb->cb_next;
1023 +
1024 +       atomic_set(&next->refcnt, 1);
1025 +
1026 +       skb->cb_next = next;
1027 +       return 0;
1028 +}
1029 +EXPORT_SYMBOL(skb_save_cb);
1030 +
1031 +int skb_restore_cb(struct sk_buff *skb)
1032 +{
1033 +       struct skb_cb_table *next;
1034 +
1035 +       if (!skb->cb_next)
1036 +               return 0;
1037 +
1038 +       next = skb->cb_next;
1039 +
1040 +       BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb));
1041 +
1042 +       memcpy(skb->cb, next->cb, sizeof(skb->cb));
1043 +       skb->cb_next = next->cb_next;
1044 +
1045 +       spin_lock(&skb_cb_store_lock);
1046 +
1047 +       if (atomic_dec_and_test(&next->refcnt)) {
1048 +               kmem_cache_free(skbuff_cb_store_cache, next);
1049 +       }
1050 +
1051 +       spin_unlock(&skb_cb_store_lock);
1052 +
1053 +       return 0;
1054 +}
1055 +EXPORT_SYMBOL(skb_restore_cb);
1056 +
1057 +static void skb_copy_stored_cb(struct sk_buff *new, const struct sk_buff *__old)
1058 +{
1059 +       struct skb_cb_table *next;
1060 +       struct sk_buff *old;
1061 +
1062 +       if (!__old->cb_next) {
1063 +               new->cb_next = NULL;
1064 +               return;
1065 +       }
1066 +
1067 +       spin_lock(&skb_cb_store_lock);
1068 +
1069 +       old = (struct sk_buff *)__old;
1070 +
1071 +       next = old->cb_next;
1072 +       atomic_inc(&next->refcnt);
1073 +       new->cb_next = next;
1074 +
1075 +       spin_unlock(&skb_cb_store_lock);
1076 +}
1077 +#endif
1078
1079  /* Pipe buffer operations for a socket. */
1080  static const struct pipe_buf_operations sock_pipe_buf_ops = {
1081 @@ -378,6 +458,26 @@ static void skb_release_head_state(struc
1082                 WARN_ON(in_irq());
1083                 skb->destructor(skb);
1084         }
1085 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1086 +       /* This should not happen. When it does, avoid memleak by restoring
1087 +       the chain of cb-backups. */
1088 +       while(skb->cb_next != NULL) {
1089 +               if (net_ratelimit())
1090 +                       printk(KERN_WARNING "IMQ: kfree_skb: skb->cb_next: "
1091 +                               "%08x\n", (unsigned int)skb->cb_next);
1092 +
1093 +               skb_restore_cb(skb);
1094 +       }
1095 +       /* This should not happen either, nf_queue_entry is nullified in
1096 +        * imq_dev_xmit(). If we have non-NULL nf_queue_entry then we are
1097 +        * leaking entry pointers, maybe memory. We don't know if this is
1098 +        * pointer to already freed memory, or should this be freed.
1099 +        * If this happens we need to add refcounting, etc for nf_queue_entry.
1100 +        */
1101 +       if (skb->nf_queue_entry && net_ratelimit())
1102 +               printk(KERN_WARNING
1103 +                               "IMQ: kfree_skb: skb->nf_queue_entry != NULL");
1104 +#endif
1105  #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1106         nf_conntrack_put(skb->nfct);
1107         nf_conntrack_put_reasm(skb->nfct_reasm);
1108 @@ -514,6 +614,9 @@ static void __copy_skb_header(struct sk_
1109         new->sp                 = secpath_get(old->sp);
1110  #endif
1111         memcpy(new->cb, old->cb, sizeof(old->cb));
1112 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1113 +       skb_copy_stored_cb(new, old);
1114 +#endif
1115         new->csum               = old->csum;
1116         new->local_df           = old->local_df;
1117         new->pkt_type           = old->pkt_type;
1118 @@ -2765,6 +2868,13 @@ void __init skb_init(void)
1119                                                 0,
1120                                                 SLAB_HWCACHE_ALIGN|SLAB_PANIC,
1121                                                 NULL);
1122 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1123 +       skbuff_cb_store_cache = kmem_cache_create("skbuff_cb_store_cache",
1124 +                                                 sizeof(struct skb_cb_table),
1125 +                                                 0,
1126 +                                                 SLAB_HWCACHE_ALIGN|SLAB_PANIC,
1127 +                                                 NULL);
1128 +#endif
1129  }
1130
1131  /**
1132 --- a/net/netfilter/Kconfig
1133 +++ b/net/netfilter/Kconfig
1134 @@ -455,6 +455,18 @@ config NETFILTER_XT_TARGET_LED
1135           For more information on the LEDs available on your system, see
1136           Documentation/leds-class.txt
1137
1138 +config NETFILTER_XT_TARGET_IMQ
1139 +        tristate '"IMQ" target support'
1140 +       depends on NETFILTER_XTABLES
1141 +       depends on IP_NF_MANGLE || IP6_NF_MANGLE
1142 +       select IMQ
1143 +       default m if NETFILTER_ADVANCED=n
1144 +        help
1145 +          This option adds a `IMQ' target which is used to specify if and
1146 +          to which imq device packets should get enqueued/dequeued.
1147 +
1148 +          To compile it as a module, choose M here.  If unsure, say N.
1149 +
1150  config NETFILTER_XT_TARGET_MARK
1151         tristate '"MARK" target support'
1152         depends on NETFILTER_ADVANCED
1153 --- a/net/netfilter/Makefile
1154 +++ b/net/netfilter/Makefile
1155 @@ -51,6 +51,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSEC
1156  obj-$(CONFIG_NETFILTER_XT_TARGET_CT) += xt_CT.o
1157  obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o
1158  obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o
1159 +obj-$(CONFIG_NETFILTER_XT_TARGET_IMQ) += xt_IMQ.o
1160  obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o
1161  obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o
1162  obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o
1163 --- a/net/netfilter/nf_queue.c
1164 +++ b/net/netfilter/nf_queue.c
1165 @@ -22,6 +22,26 @@ static const struct nf_queue_handler __r
1166
1167  static DEFINE_MUTEX(queue_handler_mutex);
1168
1169 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1170 +static const struct nf_queue_handler *queue_imq_handler;
1171 +
1172 +void nf_register_queue_imq_handler(const struct nf_queue_handler *qh)
1173 +{
1174 +       mutex_lock(&queue_handler_mutex);
1175 +       rcu_assign_pointer(queue_imq_handler, qh);
1176 +       mutex_unlock(&queue_handler_mutex);
1177 +}
1178 +EXPORT_SYMBOL(nf_register_queue_imq_handler);
1179 +
1180 +void nf_unregister_queue_imq_handler(void)
1181 +{
1182 +       mutex_lock(&queue_handler_mutex);
1183 +       rcu_assign_pointer(queue_imq_handler, NULL);
1184 +       mutex_unlock(&queue_handler_mutex);
1185 +}
1186 +EXPORT_SYMBOL(nf_unregister_queue_imq_handler);
1187 +#endif
1188 +
1189  /* return EBUSY when somebody else is registered, return EEXIST if the
1190   * same handler is registered, return 0 in case of success. */
1191  int nf_register_queue_handler(u_int8_t pf, const struct nf_queue_handler *qh)
1192 @@ -82,7 +102,7 @@ void nf_unregister_queue_handlers(const
1193  }
1194  EXPORT_SYMBOL_GPL(nf_unregister_queue_handlers);
1195
1196 -static void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
1197 +void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
1198  {
1199         /* Release those devices we held, or Alexey will kill me. */
1200         if (entry->indev)
1201 @@ -102,6 +122,7 @@ static void nf_queue_entry_release_refs(
1202         /* Drop reference to owner of hook which queued us. */
1203         module_put(entry->elem->owner);
1204  }
1205 +EXPORT_SYMBOL_GPL(nf_queue_entry_release_refs);
1206
1207  /*
1208   * Any packet that leaves via this function must come back
1209 @@ -123,12 +144,26 @@ static int __nf_queue(struct sk_buff *sk
1210  #endif
1211         const struct nf_afinfo *afinfo;
1212         const struct nf_queue_handler *qh;
1213 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1214 +       const struct nf_queue_handler *qih = NULL;
1215 +#endif
1216
1217         /* QUEUE == DROP if noone is waiting, to be safe. */
1218         rcu_read_lock();
1219
1220         qh = rcu_dereference(queue_handler[pf]);
1221 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1222 +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1223 +       if (pf == PF_INET || pf == PF_INET6)
1224 +#else
1225 +       if (pf == PF_INET)
1226 +#endif
1227 +               qih = rcu_dereference(queue_imq_handler);
1228 +
1229 +       if (!qh && !qih)
1230 +#else /* !IMQ */
1231         if (!qh)
1232 +#endif
1233                 goto err_unlock;
1234
1235         afinfo = nf_get_afinfo(pf);
1236 @@ -147,6 +182,10 @@ static int __nf_queue(struct sk_buff *sk
1237                 .indev  = indev,
1238                 .outdev = outdev,
1239                 .okfn   = okfn,
1240 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1241 +               .next_outfn = qh ? qh->outfn : NULL,
1242 +               .next_queuenum = queuenum,
1243 +#endif
1244         };
1245
1246         /* If it's going away, ignore hook. */
1247 @@ -173,8 +212,19 @@ static int __nf_queue(struct sk_buff *sk
1248  #endif
1249         skb_dst_force(skb);
1250         afinfo->saveroute(skb, entry);
1251 +
1252 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1253 +       if (qih) {
1254 +               status = qih->outfn(entry, queuenum);
1255 +               goto imq_skip_queue;
1256 +       }
1257 +#endif
1258 +
1259         status = qh->outfn(entry, queuenum);
1260
1261 +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1262 +imq_skip_queue:
1263 +#endif
1264         rcu_read_unlock();
1265
1266         if (status < 0) {
1267 --- /dev/null
1268 +++ b/net/netfilter/xt_IMQ.c
1269 @@ -0,0 +1,73 @@
1270 +/*
1271 + * This target marks packets to be enqueued to an imq device
1272 + */
1273 +#include <linux/module.h>
1274 +#include <linux/skbuff.h>
1275 +#include <linux/netfilter/x_tables.h>
1276 +#include <linux/netfilter/xt_IMQ.h>
1277 +#include <linux/imq.h>
1278 +
1279 +static unsigned int imq_target(struct sk_buff *pskb,
1280 +                               const struct xt_action_param *par)
1281 +{
1282 +       const struct xt_imq_info *mr = par->targinfo;
1283 +
1284 +       pskb->imq_flags = (mr->todev & IMQ_F_IFMASK) | IMQ_F_ENQUEUE;
1285 +
1286 +       return XT_CONTINUE;
1287 +}
1288 +
1289 +static int imq_checkentry(const struct xt_tgchk_param *par)
1290 +{
1291 +       struct xt_imq_info *mr = par->targinfo;
1292 +
1293 +       if (mr->todev > IMQ_MAX_DEVS - 1) {
1294 +               printk(KERN_WARNING
1295 +                      "IMQ: invalid device specified, highest is %u\n",
1296 +                      IMQ_MAX_DEVS - 1);
1297 +               return -EINVAL;
1298 +       }
1299 +
1300 +       return 0;
1301 +}
1302 +
1303 +static struct xt_target xt_imq_reg[] __read_mostly = {
1304 +       {
1305 +               .name           = "IMQ",
1306 +               .family         = AF_INET,
1307 +               .checkentry     = imq_checkentry,
1308 +               .target         = imq_target,
1309 +               .targetsize     = sizeof(struct xt_imq_info),
1310 +               .table          = "mangle",
1311 +               .me             = THIS_MODULE
1312 +       },
1313 +       {
1314 +               .name           = "IMQ",
1315 +               .family         = AF_INET6,
1316 +               .checkentry     = imq_checkentry,
1317 +               .target         = imq_target,
1318 +               .targetsize     = sizeof(struct xt_imq_info),
1319 +               .table          = "mangle",
1320 +               .me             = THIS_MODULE
1321 +       },
1322 +};
1323 +
1324 +static int __init imq_init(void)
1325 +{
1326 +       return xt_register_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg));
1327 +}
1328 +
1329 +static void __exit imq_fini(void)
1330 +{
1331 +       xt_unregister_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg));
1332 +}
1333 +
1334 +module_init(imq_init);
1335 +module_exit(imq_fini);
1336 +
1337 +MODULE_AUTHOR("http://www.linuximq.net");
1338 +MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See http://www.linuximq.net/ for more information.");
1339 +MODULE_LICENSE("GPL");
1340 +MODULE_ALIAS("ipt_IMQ");
1341 +MODULE_ALIAS("ip6t_IMQ");
1342 +