diff options
Diffstat (limited to 'target')
3 files changed, 4026 insertions, 0 deletions
diff --git a/target/linux/generic/patches-2.6.35/150-netfilter_imq.patch b/target/linux/generic/patches-2.6.35/150-netfilter_imq.patch new file mode 100644 index 000000000..019547058 --- /dev/null +++ b/target/linux/generic/patches-2.6.35/150-netfilter_imq.patch @@ -0,0 +1,1342 @@ +--- /dev/null ++++ b/drivers/net/imq.c +@@ -0,0 +1,638 @@ ++/* ++ * Pseudo-driver for the intermediate queue device. ++ * ++ * This program is free software; you can redistribute it and/or ++ * modify it under the terms of the GNU General Public License ++ * as published by the Free Software Foundation; either version ++ * 2 of the License, or (at your option) any later version. ++ * ++ * Authors: Patrick McHardy, <kaber@trash.net> ++ * ++ * The first version was written by Martin Devera, <devik@cdi.cz> ++ * ++ * Credits: Jan Rafaj <imq2t@cedric.vabo.cz> ++ * - Update patch to 2.4.21 ++ * Sebastian Strollo <sstrollo@nortelnetworks.com> ++ * - Fix "Dead-loop on netdevice imq"-issue ++ * Marcel Sebek <sebek64@post.cz> ++ * - Update to 2.6.2-rc1 ++ * ++ * After some time of inactivity there is a group taking care ++ * of IMQ again: http://www.linuximq.net ++ * ++ * ++ * 2004/06/30 - New version of IMQ patch to kernels <=2.6.7 ++ * including the following changes: ++ * ++ * - Correction of ipv6 support "+"s issue (Hasso Tepper) ++ * - Correction of imq_init_devs() issue that resulted in ++ * kernel OOPS unloading IMQ as module (Norbert Buchmuller) ++ * - Addition of functionality to choose number of IMQ devices ++ * during kernel config (Andre Correa) ++ * - Addition of functionality to choose how IMQ hooks on ++ * PRE and POSTROUTING (after or before NAT) (Andre Correa) ++ * - Cosmetic corrections (Norbert Buchmuller) (Andre Correa) ++ * ++ * ++ * 2005/12/16 - IMQ versions between 2.6.7 and 2.6.13 were ++ * released with almost no problems. 2.6.14-x was released ++ * with some important changes: nfcache was removed; After ++ * some weeks of trouble we figured out that some IMQ fields ++ * in skb were missing in skbuff.c - skb_clone and copy_skb_header. ++ * These functions are correctly patched by this new patch version. ++ * ++ * Thanks for all who helped to figure out all the problems with ++ * 2.6.14.x: Patrick McHardy, Rune Kock, VeNoMouS, Max CtRiX, ++ * Kevin Shanahan, Richard Lucassen, Valery Dachev (hopefully ++ * I didn't forget anybody). I apologize again for my lack of time. ++ * ++ * ++ * 2008/06/17 - 2.6.25 - Changed imq.c to use qdisc_run() instead ++ * of qdisc_restart() and moved qdisc_run() to tasklet to avoid ++ * recursive locking. New initialization routines to fix 'rmmod' not ++ * working anymore. Used code from ifb.c. (Jussi Kivilinna) ++ * ++ * 2008/08/06 - 2.6.26 - (JK) ++ * - Replaced tasklet with 'netif_schedule()'. ++ * - Cleaned up and added comments for imq_nf_queue(). ++ * ++ * 2009/04/12 ++ * - Add skb_save_cb/skb_restore_cb helper functions for backuping ++ * control buffer. This is needed because qdisc-layer on kernels ++ * 2.6.27 and newer overwrite control buffer. (Jussi Kivilinna) ++ * - Add better locking for IMQ device. Hopefully this will solve ++ * SMP issues. (Jussi Kivilinna) ++ * - Port to 2.6.27 ++ * - Port to 2.6.28 ++ * - Port to 2.6.29 + fix rmmod not working ++ * ++ * 2009/04/20 - (Jussi Kivilinna) ++ * - Use netdevice feature flags to avoid extra packet handling ++ * by core networking layer and possibly increase performance. ++ * ++ * 2009/09/26 - (Jussi Kivilinna) ++ * - Add imq_nf_reinject_lockless to fix deadlock with ++ * imq_nf_queue/imq_nf_reinject. ++ * ++ * 2009/12/08 - (Jussi Kivilinna) ++ * - Port to 2.6.32 ++ * - Add check for skb->nf_queue_entry==NULL in imq_dev_xmit() ++ * - Also add better error checking for skb->nf_queue_entry usage ++ * ++ * 2010/02/25 - (Jussi Kivilinna) ++ * - Port to 2.6.33 ++ * ++ * 2010/08/12 - (Jussi Kivilinna) ++ * - Port to 2.6.35 ++ * ++ * Also, many thanks to pablo Sebastian Greco for making the initial ++ * patch and to those who helped the testing. ++ * ++ * More info at: http://www.linuximq.net/ (Andre Correa) ++ */ ++ ++#include <linux/module.h> ++#include <linux/kernel.h> ++#include <linux/moduleparam.h> ++#include <linux/list.h> ++#include <linux/skbuff.h> ++#include <linux/netdevice.h> ++#include <linux/etherdevice.h> ++#include <linux/rtnetlink.h> ++#include <linux/if_arp.h> ++#include <linux/netfilter.h> ++#include <linux/netfilter_ipv4.h> ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++ #include <linux/netfilter_ipv6.h> ++#endif ++#include <linux/imq.h> ++#include <net/pkt_sched.h> ++#include <net/netfilter/nf_queue.h> ++ ++static nf_hookfn imq_nf_hook; ++ ++static struct nf_hook_ops imq_ingress_ipv4 = { ++ .hook = imq_nf_hook, ++ .owner = THIS_MODULE, ++ .pf = PF_INET, ++ .hooknum = NF_INET_PRE_ROUTING, ++#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) ++ .priority = NF_IP_PRI_MANGLE + 1 ++#else ++ .priority = NF_IP_PRI_NAT_DST + 1 ++#endif ++}; ++ ++static struct nf_hook_ops imq_egress_ipv4 = { ++ .hook = imq_nf_hook, ++ .owner = THIS_MODULE, ++ .pf = PF_INET, ++ .hooknum = NF_INET_POST_ROUTING, ++#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA) ++ .priority = NF_IP_PRI_LAST ++#else ++ .priority = NF_IP_PRI_NAT_SRC - 1 ++#endif ++}; ++ ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++static struct nf_hook_ops imq_ingress_ipv6 = { ++ .hook = imq_nf_hook, ++ .owner = THIS_MODULE, ++ .pf = PF_INET6, ++ .hooknum = NF_INET_PRE_ROUTING, ++#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) ++ .priority = NF_IP6_PRI_MANGLE + 1 ++#else ++ .priority = NF_IP6_PRI_NAT_DST + 1 ++#endif ++}; ++ ++static struct nf_hook_ops imq_egress_ipv6 = { ++ .hook = imq_nf_hook, ++ .owner = THIS_MODULE, ++ .pf = PF_INET6, ++ .hooknum = NF_INET_POST_ROUTING, ++#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA) ++ .priority = NF_IP6_PRI_LAST ++#else ++ .priority = NF_IP6_PRI_NAT_SRC - 1 ++#endif ++}; ++#endif ++ ++#if defined(CONFIG_IMQ_NUM_DEVS) ++static unsigned int numdevs = CONFIG_IMQ_NUM_DEVS; ++#else ++static unsigned int numdevs = IMQ_MAX_DEVS; ++#endif ++ ++static DEFINE_SPINLOCK(imq_nf_queue_lock); ++ ++static struct net_device *imq_devs_cache[IMQ_MAX_DEVS]; ++ ++ ++static struct net_device_stats *imq_get_stats(struct net_device *dev) ++{ ++ return &dev->stats; ++} ++ ++/* called for packets kfree'd in qdiscs at places other than enqueue */ ++static void imq_skb_destructor(struct sk_buff *skb) ++{ ++ struct nf_queue_entry *entry = skb->nf_queue_entry; ++ ++ skb->nf_queue_entry = NULL; ++ ++ if (entry) { ++ nf_queue_entry_release_refs(entry); ++ kfree(entry); ++ } ++ ++ skb_restore_cb(skb); /* kfree backup */ ++} ++ ++/* locking not needed when called from imq_nf_queue */ ++static void imq_nf_reinject_lockless(struct nf_queue_entry *entry, ++ unsigned int verdict) ++{ ++ int status; ++ ++ if (!entry->next_outfn) { ++ nf_reinject(entry, verdict); ++ return; ++ } ++ ++ status = entry->next_outfn(entry, entry->next_queuenum); ++ if (status < 0) { ++ nf_queue_entry_release_refs(entry); ++ kfree_skb(entry->skb); ++ kfree(entry); ++ } ++} ++ ++static void imq_nf_reinject(struct nf_queue_entry *entry, unsigned int verdict) ++{ ++ int status; ++ ++ if (!entry->next_outfn) { ++ spin_lock_bh(&imq_nf_queue_lock); ++ nf_reinject(entry, verdict); ++ spin_unlock_bh(&imq_nf_queue_lock); ++ return; ++ } ++ ++ rcu_read_lock(); ++ local_bh_disable(); ++ status = entry->next_outfn(entry, entry->next_queuenum); ++ local_bh_enable(); ++ if (status < 0) { ++ nf_queue_entry_release_refs(entry); ++ kfree_skb(entry->skb); ++ kfree(entry); ++ } ++ ++ rcu_read_unlock(); ++} ++ ++static netdev_tx_t imq_dev_xmit(struct sk_buff *skb, struct net_device *dev) ++{ ++ struct nf_queue_entry *entry = skb->nf_queue_entry; ++ ++ skb->nf_queue_entry = NULL; ++ dev->trans_start = jiffies; ++ ++ dev->stats.tx_bytes += skb->len; ++ dev->stats.tx_packets++; ++ ++ if (entry == NULL) { ++ /* We don't know what is going on here.. packet is queued for ++ * imq device, but (probably) not by us. ++ * ++ * If this packet was not send here by imq_nf_queue(), then ++ * skb_save_cb() was not used and skb_free() should not show: ++ * WARNING: IMQ: kfree_skb: skb->cb_next:.. ++ * and/or ++ * WARNING: IMQ: kfree_skb: skb->nf_queue_entry... ++ * ++ * However if this message is shown, then IMQ is somehow broken ++ * and you should report this to linuximq.net. ++ */ ++ ++ /* imq_dev_xmit is black hole that eats all packets, report that ++ * we eat this packet happily and increase dropped counters. ++ */ ++ ++ dev->stats.tx_dropped++; ++ dev_kfree_skb(skb); ++ ++ return NETDEV_TX_OK; ++ } ++ ++ skb_restore_cb(skb); /* restore skb->cb */ ++ ++ skb->imq_flags = 0; ++ skb->destructor = NULL; ++ ++ imq_nf_reinject(entry, NF_ACCEPT); ++ ++ return NETDEV_TX_OK; ++} ++ ++static int imq_nf_queue(struct nf_queue_entry *entry, unsigned queue_num) ++{ ++ struct net_device *dev; ++ struct sk_buff *skb_orig, *skb, *skb_shared; ++ struct Qdisc *q; ++ struct netdev_queue *txq; ++ int users, index; ++ int retval = -EINVAL; ++ ++ index = entry->skb->imq_flags & IMQ_F_IFMASK; ++ if (unlikely(index > numdevs - 1)) { ++ if (net_ratelimit()) ++ printk(KERN_WARNING ++ "IMQ: invalid device specified, highest is %u\n", ++ numdevs - 1); ++ retval = -EINVAL; ++ goto out; ++ } ++ ++ /* check for imq device by index from cache */ ++ dev = imq_devs_cache[index]; ++ if (unlikely(!dev)) { ++ char buf[8]; ++ ++ /* get device by name and cache result */ ++ snprintf(buf, sizeof(buf), "imq%d", index); ++ dev = dev_get_by_name(&init_net, buf); ++ if (!dev) { ++ /* not found ?!*/ ++ BUG(); ++ retval = -ENODEV; ++ goto out; ++ } ++ ++ imq_devs_cache[index] = dev; ++ dev_put(dev); ++ } ++ ++ if (unlikely(!(dev->flags & IFF_UP))) { ++ entry->skb->imq_flags = 0; ++ imq_nf_reinject_lockless(entry, NF_ACCEPT); ++ retval = 0; ++ goto out; ++ } ++ dev->last_rx = jiffies; ++ ++ skb = entry->skb; ++ skb_orig = NULL; ++ ++ /* skb has owner? => make clone */ ++ if (unlikely(skb->destructor)) { ++ skb_orig = skb; ++ skb = skb_clone(skb, GFP_ATOMIC); ++ if (!skb) { ++ retval = -ENOMEM; ++ goto out; ++ } ++ entry->skb = skb; ++ } ++ ++ skb->nf_queue_entry = entry; ++ ++ dev->stats.rx_bytes += skb->len; ++ dev->stats.rx_packets++; ++ ++ txq = dev_pick_tx(dev, skb); ++ ++ q = rcu_dereference(txq->qdisc); ++ if (unlikely(!q->enqueue)) ++ goto packet_not_eaten_by_imq_dev; ++ ++ spin_lock_bh(qdisc_lock(q)); ++ ++ users = atomic_read(&skb->users); ++ ++ skb_shared = skb_get(skb); /* increase reference count by one */ ++ skb_save_cb(skb_shared); /* backup skb->cb, as qdisc layer will ++ overwrite it */ ++ qdisc_enqueue_root(skb_shared, q); /* might kfree_skb */ ++ ++ if (likely(atomic_read(&skb_shared->users) == users + 1)) { ++ kfree_skb(skb_shared); /* decrease reference count by one */ ++ ++ skb->destructor = &imq_skb_destructor; ++ ++ /* cloned? */ ++ if (skb_orig) ++ kfree_skb(skb_orig); /* free original */ ++ ++ spin_unlock_bh(qdisc_lock(q)); ++ ++ /* schedule qdisc dequeue */ ++ __netif_schedule(q); ++ ++ retval = 0; ++ goto out; ++ } else { ++ skb_restore_cb(skb_shared); /* restore skb->cb */ ++ skb->nf_queue_entry = NULL; ++ /* qdisc dropped packet and decreased skb reference count of ++ * skb, so we don't really want to and try refree as that would ++ * actually destroy the skb. */ ++ spin_unlock_bh(qdisc_lock(q)); ++ goto packet_not_eaten_by_imq_dev; ++ } ++ ++packet_not_eaten_by_imq_dev: ++ /* cloned? restore original */ ++ if (skb_orig) { ++ kfree_skb(skb); ++ entry->skb = skb_orig; ++ } ++ retval = -1; ++out: ++ return retval; ++} ++ ++static struct nf_queue_handler nfqh = { ++ .name = "imq", ++ .outfn = imq_nf_queue, ++}; ++ ++static unsigned int imq_nf_hook(unsigned int hook, struct sk_buff *pskb, ++ const struct net_device *indev, ++ const struct net_device *outdev, ++ int (*okfn)(struct sk_buff *)) ++{ ++ if (pskb->imq_flags & IMQ_F_ENQUEUE) ++ return NF_QUEUE; ++ ++ return NF_ACCEPT; ++} ++ ++static int imq_close(struct net_device *dev) ++{ ++ netif_stop_queue(dev); ++ return 0; ++} ++ ++static int imq_open(struct net_device *dev) ++{ ++ netif_start_queue(dev); ++ return 0; ++} ++ ++static const struct net_device_ops imq_netdev_ops = { ++ .ndo_open = imq_open, ++ .ndo_stop = imq_close, ++ .ndo_start_xmit = imq_dev_xmit, ++ .ndo_get_stats = imq_get_stats, ++}; ++ ++static void imq_setup(struct net_device *dev) ++{ ++ dev->netdev_ops = &imq_netdev_ops; ++ dev->type = ARPHRD_VOID; ++ dev->mtu = 16000; ++ dev->tx_queue_len = 11000; ++ dev->flags = IFF_NOARP; ++ dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | ++ NETIF_F_GSO | NETIF_F_HW_CSUM | ++ NETIF_F_HIGHDMA; ++ dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; ++} ++ ++static int imq_validate(struct nlattr *tb[], struct nlattr *data[]) ++{ ++ int ret = 0; ++ ++ if (tb[IFLA_ADDRESS]) { ++ if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { ++ ret = -EINVAL; ++ goto end; ++ } ++ if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { ++ ret = -EADDRNOTAVAIL; ++ goto end; ++ } ++ } ++ return 0; ++end: ++ printk(KERN_WARNING "IMQ: imq_validate failed (%d)\n", ret); ++ return ret; ++} ++ ++static struct rtnl_link_ops imq_link_ops __read_mostly = { ++ .kind = "imq", ++ .priv_size = 0, ++ .setup = imq_setup, ++ .validate = imq_validate, ++}; ++ ++static int __init imq_init_hooks(void) ++{ ++ int err; ++ ++ nf_register_queue_imq_handler(&nfqh); ++ ++ err = nf_register_hook(&imq_ingress_ipv4); ++ if (err) ++ goto err1; ++ ++ err = nf_register_hook(&imq_egress_ipv4); ++ if (err) ++ goto err2; ++ ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++ err = nf_register_hook(&imq_ingress_ipv6); ++ if (err) ++ goto err3; ++ ++ err = nf_register_hook(&imq_egress_ipv6); ++ if (err) ++ goto err4; ++#endif ++ ++ return 0; ++ ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++err4: ++ nf_unregister_hook(&imq_ingress_ipv6); ++err3: ++ nf_unregister_hook(&imq_egress_ipv4); ++#endif ++err2: ++ nf_unregister_hook(&imq_ingress_ipv4); ++err1: ++ nf_unregister_queue_imq_handler(); ++ return err; ++} ++ ++static int __init imq_init_one(int index) ++{ ++ struct net_device *dev; ++ int ret; ++ ++ dev = alloc_netdev(0, "imq%d", imq_setup); ++ if (!dev) ++ return -ENOMEM; ++ ++ ret = dev_alloc_name(dev, dev->name); ++ if (ret < 0) ++ goto fail; ++ ++ dev->rtnl_link_ops = &imq_link_ops; ++ ret = register_netdevice(dev); ++ if (ret < 0) ++ goto fail; ++ ++ return 0; ++fail: ++ free_netdev(dev); ++ return ret; ++} ++ ++static int __init imq_init_devs(void) ++{ ++ int err, i; ++ ++ if (numdevs < 1 || numdevs > IMQ_MAX_DEVS) { ++ printk(KERN_ERR "IMQ: numdevs has to be betweed 1 and %u\n", ++ IMQ_MAX_DEVS); ++ return -EINVAL; ++ } ++ ++ rtnl_lock(); ++ err = __rtnl_link_register(&imq_link_ops); ++ ++ for (i = 0; i < numdevs && !err; i++) ++ err = imq_init_one(i); ++ ++ if (err) { ++ __rtnl_link_unregister(&imq_link_ops); ++ memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); ++ } ++ rtnl_unlock(); ++ ++ return err; ++} ++ ++static int __init imq_init_module(void) ++{ ++ int err; ++ ++#if defined(CONFIG_IMQ_NUM_DEVS) ++ BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS > 16); ++ BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS < 2); ++ BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS - 1 > IMQ_F_IFMASK); ++#endif ++ ++ err = imq_init_devs(); ++ if (err) { ++ printk(KERN_ERR "IMQ: Error trying imq_init_devs(net)\n"); ++ return err; ++ } ++ ++ err = imq_init_hooks(); ++ if (err) { ++ printk(KERN_ERR "IMQ: Error trying imq_init_hooks()\n"); ++ rtnl_link_unregister(&imq_link_ops); ++ memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); ++ return err; ++ } ++ ++ printk(KERN_INFO "IMQ driver loaded successfully.\n"); ++ ++#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) ++ printk(KERN_INFO "\tHooking IMQ before NAT on PREROUTING.\n"); ++#else ++ printk(KERN_INFO "\tHooking IMQ after NAT on PREROUTING.\n"); ++#endif ++#if defined(CONFIG_IMQ_BEHAVIOR_AB) || defined(CONFIG_IMQ_BEHAVIOR_BB) ++ printk(KERN_INFO "\tHooking IMQ before NAT on POSTROUTING.\n"); ++#else ++ printk(KERN_INFO "\tHooking IMQ after NAT on POSTROUTING.\n"); ++#endif ++ ++ return 0; ++} ++ ++static void __exit imq_unhook(void) ++{ ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++ nf_unregister_hook(&imq_ingress_ipv6); ++ nf_unregister_hook(&imq_egress_ipv6); ++#endif ++ nf_unregister_hook(&imq_ingress_ipv4); ++ nf_unregister_hook(&imq_egress_ipv4); ++ ++ nf_unregister_queue_imq_handler(); ++} ++ ++static void __exit imq_cleanup_devs(void) ++{ ++ rtnl_link_unregister(&imq_link_ops); ++ memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); ++} ++ ++static void __exit imq_exit_module(void) ++{ ++ imq_unhook(); ++ imq_cleanup_devs(); ++ printk(KERN_INFO "IMQ driver unloaded successfully.\n"); ++} ++ ++module_init(imq_init_module); ++module_exit(imq_exit_module); ++ ++module_param(numdevs, int, 0); ++MODULE_PARM_DESC(numdevs, "number of IMQ devices (how many imq* devices will " ++ "be created)"); ++MODULE_AUTHOR("http://www.linuximq.net"); ++MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See " ++ "http://www.linuximq.net/ for more information."); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS_RTNL_LINK("imq"); ++ +--- a/drivers/net/Kconfig ++++ b/drivers/net/Kconfig +@@ -121,6 +121,129 @@ config EQUALIZER + To compile this driver as a module, choose M here: the module + will be called eql. If unsure, say N. + ++config IMQ ++ tristate "IMQ (intermediate queueing device) support" ++ depends on NETDEVICES && NETFILTER ++ ---help--- ++ The IMQ device(s) is used as placeholder for QoS queueing ++ disciplines. Every packet entering/leaving the IP stack can be ++ directed through the IMQ device where it's enqueued/dequeued to the ++ attached qdisc. This allows you to treat network devices as classes ++ and distribute bandwidth among them. Iptables is used to specify ++ through which IMQ device, if any, packets travel. ++ ++ More information at: http://www.linuximq.net/ ++ ++ To compile this driver as a module, choose M here: the module ++ will be called imq. If unsure, say N. ++ ++choice ++ prompt "IMQ behavior (PRE/POSTROUTING)" ++ depends on IMQ ++ default IMQ_BEHAVIOR_AB ++ help ++ ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ IMQ can work in any of the following ways: ++ ++ PREROUTING | POSTROUTING ++ -----------------|------------------- ++ #1 After NAT | After NAT ++ #2 After NAT | Before NAT ++ #3 Before NAT | After NAT ++ #4 Before NAT | Before NAT ++ ++ The default behavior is to hook before NAT on PREROUTING ++ and after NAT on POSTROUTING (#3). ++ ++ This settings are specially usefull when trying to use IMQ ++ to shape NATed clients. ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++config IMQ_BEHAVIOR_AA ++ bool "IMQ AA" ++ help ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ Choosing this option will make IMQ hook like this: ++ ++ PREROUTING: After NAT ++ POSTROUTING: After NAT ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++config IMQ_BEHAVIOR_AB ++ bool "IMQ AB" ++ help ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ Choosing this option will make IMQ hook like this: ++ ++ PREROUTING: After NAT ++ POSTROUTING: Before NAT ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++config IMQ_BEHAVIOR_BA ++ bool "IMQ BA" ++ help ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ Choosing this option will make IMQ hook like this: ++ ++ PREROUTING: Before NAT ++ POSTROUTING: After NAT ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++config IMQ_BEHAVIOR_BB ++ bool "IMQ BB" ++ help ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ Choosing this option will make IMQ hook like this: ++ ++ PREROUTING: Before NAT ++ POSTROUTING: Before NAT ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++endchoice ++ ++config IMQ_NUM_DEVS ++ ++ int "Number of IMQ devices" ++ range 2 16 ++ depends on IMQ ++ default "16" ++ help ++ ++ This settings defines how many IMQ devices will be ++ created. ++ ++ The default value is 16. ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ + config TUN + tristate "Universal TUN/TAP device driver support" + select CRC32 +--- a/drivers/net/Makefile ++++ b/drivers/net/Makefile +@@ -169,6 +169,7 @@ obj-$(CONFIG_SLHC) += slhc.o + obj-$(CONFIG_XEN_NETDEV_FRONTEND) += xen-netfront.o + + obj-$(CONFIG_DUMMY) += dummy.o ++obj-$(CONFIG_IMQ) += imq.o + obj-$(CONFIG_IFB) += ifb.o + obj-$(CONFIG_MACVLAN) += macvlan.o + obj-$(CONFIG_MACVTAP) += macvtap.o +--- /dev/null ++++ b/include/linux/imq.h +@@ -0,0 +1,13 @@ ++#ifndef _IMQ_H ++#define _IMQ_H ++ ++/* IFMASK (16 device indexes, 0 to 15) and flag(s) fit in 5 bits */ ++#define IMQ_F_BITS 5 ++ ++#define IMQ_F_IFMASK 0x0f ++#define IMQ_F_ENQUEUE 0x10 ++ ++#define IMQ_MAX_DEVS (IMQ_F_IFMASK + 1) ++ ++#endif /* _IMQ_H */ ++ +--- a/include/linux/netdevice.h ++++ b/include/linux/netdevice.h +@@ -1281,6 +1281,7 @@ extern int dev_alloc_name(struct net_de + extern int dev_open(struct net_device *dev); + extern int dev_close(struct net_device *dev); + extern void dev_disable_lro(struct net_device *dev); ++extern struct netdev_queue *dev_pick_tx(struct net_device *dev, struct sk_buff *skb); + extern int dev_queue_xmit(struct sk_buff *skb); + extern int register_netdevice(struct net_device *dev); + extern void unregister_netdevice_queue(struct net_device *dev, +--- /dev/null ++++ b/include/linux/netfilter/xt_IMQ.h +@@ -0,0 +1,9 @@ ++#ifndef _XT_IMQ_H ++#define _XT_IMQ_H ++ ++struct xt_imq_info { ++ unsigned int todev; /* target imq device */ ++}; ++ ++#endif /* _XT_IMQ_H */ ++ +--- /dev/null ++++ b/include/linux/netfilter_ipv4/ipt_IMQ.h +@@ -0,0 +1,10 @@ ++#ifndef _IPT_IMQ_H ++#define _IPT_IMQ_H ++ ++/* Backwards compatibility for old userspace */ ++#include <linux/netfilter/xt_IMQ.h> ++ ++#define ipt_imq_info xt_imq_info ++ ++#endif /* _IPT_IMQ_H */ ++ +--- /dev/null ++++ b/include/linux/netfilter_ipv6/ip6t_IMQ.h +@@ -0,0 +1,10 @@ ++#ifndef _IP6T_IMQ_H ++#define _IP6T_IMQ_H ++ ++/* Backwards compatibility for old userspace */ ++#include <linux/netfilter/xt_IMQ.h> ++ ++#define ip6t_imq_info xt_imq_info ++ ++#endif /* _IP6T_IMQ_H */ ++ +--- a/include/linux/skbuff.h ++++ b/include/linux/skbuff.h +@@ -29,6 +29,9 @@ + #include <linux/rcupdate.h> + #include <linux/dmaengine.h> + #include <linux/hrtimer.h> ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++#include <linux/imq.h> ++#endif + + /* Don't change this without changing skb_csum_unnecessary! */ + #define CHECKSUM_NONE 0 +@@ -329,6 +332,9 @@ struct sk_buff { + * first. This is owned by whoever has the skb queued ATM. + */ + char cb[48] __aligned(8); ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ void *cb_next; ++#endif + + unsigned long _skb_refdst; + #ifdef CONFIG_XFRM +@@ -365,6 +371,9 @@ struct sk_buff { + struct nf_conntrack *nfct; + struct sk_buff *nfct_reasm; + #endif ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ struct nf_queue_entry *nf_queue_entry; ++#endif + #ifdef CONFIG_BRIDGE_NETFILTER + struct nf_bridge_info *nf_bridge; + #endif +@@ -391,6 +400,10 @@ struct sk_buff { + + /* 0/14 bit hole */ + ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ __u8 imq_flags:IMQ_F_BITS; ++#endif ++ + #ifdef CONFIG_NET_DMA + dma_cookie_t dma_cookie; + #endif +@@ -489,6 +502,12 @@ static inline struct rtable *skb_rtable( + return (struct rtable *)skb_dst(skb); + } + ++ ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++extern int skb_save_cb(struct sk_buff *skb); ++extern int skb_restore_cb(struct sk_buff *skb); ++#endif ++ + extern void kfree_skb(struct sk_buff *skb); + extern void consume_skb(struct sk_buff *skb); + extern void __kfree_skb(struct sk_buff *skb); +@@ -2036,6 +2055,10 @@ static inline void __nf_copy(struct sk_b + dst->nfct_reasm = src->nfct_reasm; + nf_conntrack_get_reasm(src->nfct_reasm); + #endif ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ dst->imq_flags = src->imq_flags; ++ dst->nf_queue_entry = src->nf_queue_entry; ++#endif + #ifdef CONFIG_BRIDGE_NETFILTER + dst->nf_bridge = src->nf_bridge; + nf_bridge_get(src->nf_bridge); +--- a/include/net/netfilter/nf_queue.h ++++ b/include/net/netfilter/nf_queue.h +@@ -13,6 +13,12 @@ struct nf_queue_entry { + struct net_device *indev; + struct net_device *outdev; + int (*okfn)(struct sk_buff *); ++ ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ int (*next_outfn)(struct nf_queue_entry *entry, ++ unsigned int queuenum); ++ unsigned int next_queuenum; ++#endif + }; + + #define nf_queue_entry_reroute(x) ((void *)x + sizeof(struct nf_queue_entry)) +@@ -30,5 +36,11 @@ extern int nf_unregister_queue_handler(u + const struct nf_queue_handler *qh); + extern void nf_unregister_queue_handlers(const struct nf_queue_handler *qh); + extern void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict); ++extern void nf_queue_entry_release_refs(struct nf_queue_entry *entry); ++ ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++extern void nf_register_queue_imq_handler(const struct nf_queue_handler *qh); ++extern void nf_unregister_queue_imq_handler(void); ++#endif + + #endif /* _NF_QUEUE_H */ +--- a/net/core/dev.c ++++ b/net/core/dev.c +@@ -98,6 +98,9 @@ + #include <net/net_namespace.h> + #include <net/sock.h> + #include <linux/rtnetlink.h> ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++#include <linux/imq.h> ++#endif + #include <linux/proc_fs.h> + #include <linux/seq_file.h> + #include <linux/stat.h> +@@ -1931,7 +1934,11 @@ int dev_hard_start_xmit(struct sk_buff * + int rc = NETDEV_TX_OK; + + if (likely(!skb->next)) { +- if (!list_empty(&ptype_all)) ++ if (!list_empty(&ptype_all) ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ && !(skb->imq_flags & IMQ_F_ENQUEUE) ++#endif ++ ) + dev_queue_xmit_nit(skb, dev); + + /* +@@ -2027,8 +2034,7 @@ static inline u16 dev_cap_txqueue(struct + return queue_index; + } + +-static struct netdev_queue *dev_pick_tx(struct net_device *dev, +- struct sk_buff *skb) ++struct netdev_queue *dev_pick_tx(struct net_device *dev, struct sk_buff *skb) + { + int queue_index; + struct sock *sk = skb->sk; +@@ -2057,6 +2063,7 @@ static struct netdev_queue *dev_pick_tx( + skb_set_queue_mapping(skb, queue_index); + return netdev_get_tx_queue(dev, queue_index); + } ++EXPORT_SYMBOL(dev_pick_tx); + + static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, + struct net_device *dev, +--- a/net/core/skbuff.c ++++ b/net/core/skbuff.c +@@ -72,6 +72,9 @@ + + static struct kmem_cache *skbuff_head_cache __read_mostly; + static struct kmem_cache *skbuff_fclone_cache __read_mostly; ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++static struct kmem_cache *skbuff_cb_store_cache __read_mostly; ++#endif + + static void sock_pipe_buf_release(struct pipe_inode_info *pipe, + struct pipe_buffer *buf) +@@ -91,6 +94,83 @@ static int sock_pipe_buf_steal(struct pi + return 1; + } + ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++/* Control buffer save/restore for IMQ devices */ ++struct skb_cb_table { ++ void *cb_next; ++ atomic_t refcnt; ++ char cb[48]; ++}; ++ ++static DEFINE_SPINLOCK(skb_cb_store_lock); ++ ++int skb_save_cb(struct sk_buff *skb) ++{ ++ struct skb_cb_table *next; ++ ++ next = kmem_cache_alloc(skbuff_cb_store_cache, GFP_ATOMIC); ++ if (!next) ++ return -ENOMEM; ++ ++ BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb)); ++ ++ memcpy(next->cb, skb->cb, sizeof(skb->cb)); ++ next->cb_next = skb->cb_next; ++ ++ atomic_set(&next->refcnt, 1); ++ ++ skb->cb_next = next; ++ return 0; ++} ++EXPORT_SYMBOL(skb_save_cb); ++ ++int skb_restore_cb(struct sk_buff *skb) ++{ ++ struct skb_cb_table *next; ++ ++ if (!skb->cb_next) ++ return 0; ++ ++ next = skb->cb_next; ++ ++ BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb)); ++ ++ memcpy(skb->cb, next->cb, sizeof(skb->cb)); ++ skb->cb_next = next->cb_next; ++ ++ spin_lock(&skb_cb_store_lock); ++ ++ if (atomic_dec_and_test(&next->refcnt)) { ++ kmem_cache_free(skbuff_cb_store_cache, next); ++ } ++ ++ spin_unlock(&skb_cb_store_lock); ++ ++ return 0; ++} ++EXPORT_SYMBOL(skb_restore_cb); ++ ++static void skb_copy_stored_cb(struct sk_buff *new, const struct sk_buff *__old) ++{ ++ struct skb_cb_table *next; ++ struct sk_buff *old; ++ ++ if (!__old->cb_next) { ++ new->cb_next = NULL; ++ return; ++ } ++ ++ spin_lock(&skb_cb_store_lock); ++ ++ old = (struct sk_buff *)__old; ++ ++ next = old->cb_next; ++ atomic_inc(&next->refcnt); ++ new->cb_next = next; ++ ++ spin_unlock(&skb_cb_store_lock); ++} ++#endif + + /* Pipe buffer operations for a socket. */ + static const struct pipe_buf_operations sock_pipe_buf_ops = { +@@ -391,6 +471,26 @@ static void skb_release_head_state(struc + WARN_ON(in_irq()); + skb->destructor(skb); + } ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ /* This should not happen. When it does, avoid memleak by restoring ++ the chain of cb-backups. */ ++ while(skb->cb_next != NULL) { ++ if (net_ratelimit()) ++ printk(KERN_WARNING "IMQ: kfree_skb: skb->cb_next: " ++ "%08x\n", (unsigned int)skb->cb_next); ++ ++ skb_restore_cb(skb); ++ } ++ /* This should not happen either, nf_queue_entry is nullified in ++ * imq_dev_xmit(). If we have non-NULL nf_queue_entry then we are ++ * leaking entry pointers, maybe memory. We don't know if this is ++ * pointer to already freed memory, or should this be freed. ++ * If this happens we need to add refcounting, etc for nf_queue_entry. ++ */ ++ if (skb->nf_queue_entry && net_ratelimit()) ++ printk(KERN_WARNING ++ "IMQ: kfree_skb: skb->nf_queue_entry != NULL"); ++#endif + #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) + nf_conntrack_put(skb->nfct); + nf_conntrack_put_reasm(skb->nfct_reasm); +@@ -526,6 +626,9 @@ static void __copy_skb_header(struct sk_ + new->sp = secpath_get(old->sp); + #endif + memcpy(new->cb, old->cb, sizeof(old->cb)); ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ skb_copy_stored_cb(new, old); ++#endif + new->csum = old->csum; + new->local_df = old->local_df; + new->pkt_type = old->pkt_type; +@@ -2780,6 +2883,13 @@ void __init skb_init(void) + 0, + SLAB_HWCACHE_ALIGN|SLAB_PANIC, + NULL); ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ skbuff_cb_store_cache = kmem_cache_create("skbuff_cb_store_cache", ++ sizeof(struct skb_cb_table), ++ 0, ++ SLAB_HWCACHE_ALIGN|SLAB_PANIC, ++ NULL); ++#endif + } + + /** +--- a/net/netfilter/Kconfig ++++ b/net/netfilter/Kconfig +@@ -448,6 +448,18 @@ config NETFILTER_XT_TARGET_LED + For more information on the LEDs available on your system, see + Documentation/leds-class.txt + ++config NETFILTER_XT_TARGET_IMQ ++ tristate '"IMQ" target support' ++ depends on NETFILTER_XTABLES ++ depends on IP_NF_MANGLE || IP6_NF_MANGLE ++ select IMQ ++ default m if NETFILTER_ADVANCED=n ++ help ++ This option adds a `IMQ' target which is used to specify if and ++ to which imq device packets should get enqueued/dequeued. ++ ++ To compile it as a module, choose M here. If unsure, say N. ++ + config NETFILTER_XT_TARGET_MARK + tristate '"MARK" target support' + depends on NETFILTER_ADVANCED +--- a/net/netfilter/Makefile ++++ b/net/netfilter/Makefile +@@ -50,6 +50,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSEC + obj-$(CONFIG_NETFILTER_XT_TARGET_CT) += xt_CT.o + obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o + obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o ++obj-$(CONFIG_NETFILTER_XT_TARGET_IMQ) += xt_IMQ.o + obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o + obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o + obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o +--- a/net/netfilter/nf_queue.c ++++ b/net/netfilter/nf_queue.c +@@ -22,6 +22,26 @@ static const struct nf_queue_handler *qu + + static DEFINE_MUTEX(queue_handler_mutex); + ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++static const struct nf_queue_handler *queue_imq_handler; ++ ++void nf_register_queue_imq_handler(const struct nf_queue_handler *qh) ++{ ++ mutex_lock(&queue_handler_mutex); ++ rcu_assign_pointer(queue_imq_handler, qh); ++ mutex_unlock(&queue_handler_mutex); ++} ++EXPORT_SYMBOL(nf_register_queue_imq_handler); ++ ++void nf_unregister_queue_imq_handler(void) ++{ ++ mutex_lock(&queue_handler_mutex); ++ rcu_assign_pointer(queue_imq_handler, NULL); ++ mutex_unlock(&queue_handler_mutex); ++} ++EXPORT_SYMBOL(nf_unregister_queue_imq_handler); ++#endif ++ + /* return EBUSY when somebody else is registered, return EEXIST if the + * same handler is registered, return 0 in case of success. */ + int nf_register_queue_handler(u_int8_t pf, const struct nf_queue_handler *qh) +@@ -82,7 +102,7 @@ void nf_unregister_queue_handlers(const + } + EXPORT_SYMBOL_GPL(nf_unregister_queue_handlers); + +-static void nf_queue_entry_release_refs(struct nf_queue_entry *entry) ++void nf_queue_entry_release_refs(struct nf_queue_entry *entry) + { + /* Release those devices we held, or Alexey will kill me. */ + if (entry->indev) +@@ -102,6 +122,7 @@ static void nf_queue_entry_release_refs( + /* Drop reference to owner of hook which queued us. */ + module_put(entry->elem->owner); + } ++EXPORT_SYMBOL_GPL(nf_queue_entry_release_refs); + + /* + * Any packet that leaves via this function must come back +@@ -123,12 +144,26 @@ static int __nf_queue(struct sk_buff *sk + #endif + const struct nf_afinfo *afinfo; + const struct nf_queue_handler *qh; ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ const struct nf_queue_handler *qih = NULL; ++#endif + + /* QUEUE == DROP if noone is waiting, to be safe. */ + rcu_read_lock(); + + qh = rcu_dereference(queue_handler[pf]); ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++ if (pf == PF_INET || pf == PF_INET6) ++#else ++ if (pf == PF_INET) ++#endif ++ qih = rcu_dereference(queue_imq_handler); ++ ++ if (!qh && !qih) ++#else /* !IMQ */ + if (!qh) ++#endif + goto err_unlock; + + afinfo = nf_get_afinfo(pf); +@@ -147,6 +182,10 @@ static int __nf_queue(struct sk_buff *sk + .indev = indev, + .outdev = outdev, + .okfn = okfn, ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ .next_outfn = qh ? qh->outfn : NULL, ++ .next_queuenum = queuenum, ++#endif + }; + + /* If it's going away, ignore hook. */ +@@ -173,8 +212,19 @@ static int __nf_queue(struct sk_buff *sk + #endif + skb_dst_force(skb); + afinfo->saveroute(skb, entry); ++ ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ if (qih) { ++ status = qih->outfn(entry, queuenum); ++ goto imq_skip_queue; ++ } ++#endif ++ + status = qh->outfn(entry, queuenum); + ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++imq_skip_queue: ++#endif + rcu_read_unlock(); + + if (status < 0) { +--- /dev/null ++++ b/net/netfilter/xt_IMQ.c +@@ -0,0 +1,73 @@ ++/* ++ * This target marks packets to be enqueued to an imq device ++ */ ++#include <linux/module.h> ++#include <linux/skbuff.h> ++#include <linux/netfilter/x_tables.h> ++#include <linux/netfilter/xt_IMQ.h> ++#include <linux/imq.h> ++ ++static unsigned int imq_target(struct sk_buff *pskb, ++ const struct xt_action_param *par) ++{ ++ const struct xt_imq_info *mr = par->targinfo; ++ ++ pskb->imq_flags = (mr->todev & IMQ_F_IFMASK) | IMQ_F_ENQUEUE; ++ ++ return XT_CONTINUE; ++} ++ ++static int imq_checkentry(const struct xt_tgchk_param *par) ++{ ++ struct xt_imq_info *mr = par->targinfo; ++ ++ if (mr->todev > IMQ_MAX_DEVS - 1) { ++ printk(KERN_WARNING ++ "IMQ: invalid device specified, highest is %u\n", ++ IMQ_MAX_DEVS - 1); ++ return -EINVAL; ++ } ++ ++ return 0; ++} ++ ++static struct xt_target xt_imq_reg[] __read_mostly = { ++ { ++ .name = "IMQ", ++ .family = AF_INET, ++ .checkentry = imq_checkentry, ++ .target = imq_target, ++ .targetsize = sizeof(struct xt_imq_info), ++ .table = "mangle", ++ .me = THIS_MODULE ++ }, ++ { ++ .name = "IMQ", ++ .family = AF_INET6, ++ .checkentry = imq_checkentry, ++ .target = imq_target, ++ .targetsize = sizeof(struct xt_imq_info), ++ .table = "mangle", ++ .me = THIS_MODULE ++ }, ++}; ++ ++static int __init imq_init(void) ++{ ++ return xt_register_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg)); ++} ++ ++static void __exit imq_fini(void) ++{ ++ xt_unregister_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg)); ++} ++ ++module_init(imq_init); ++module_exit(imq_fini); ++ ++MODULE_AUTHOR("http://www.linuximq.net"); ++MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See http://www.linuximq.net/ for more information."); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS("ipt_IMQ"); ++MODULE_ALIAS("ip6t_IMQ"); ++ diff --git a/target/linux/generic/patches-2.6.36/150-netfilter_imq.patch b/target/linux/generic/patches-2.6.36/150-netfilter_imq.patch new file mode 100644 index 000000000..2fb90cf6d --- /dev/null +++ b/target/linux/generic/patches-2.6.36/150-netfilter_imq.patch @@ -0,0 +1,1342 @@ +--- /dev/null ++++ b/drivers/net/imq.c +@@ -0,0 +1,638 @@ ++/* ++ * Pseudo-driver for the intermediate queue device. ++ * ++ * This program is free software; you can redistribute it and/or ++ * modify it under the terms of the GNU General Public License ++ * as published by the Free Software Foundation; either version ++ * 2 of the License, or (at your option) any later version. ++ * ++ * Authors: Patrick McHardy, <kaber@trash.net> ++ * ++ * The first version was written by Martin Devera, <devik@cdi.cz> ++ * ++ * Credits: Jan Rafaj <imq2t@cedric.vabo.cz> ++ * - Update patch to 2.4.21 ++ * Sebastian Strollo <sstrollo@nortelnetworks.com> ++ * - Fix "Dead-loop on netdevice imq"-issue ++ * Marcel Sebek <sebek64@post.cz> ++ * - Update to 2.6.2-rc1 ++ * ++ * After some time of inactivity there is a group taking care ++ * of IMQ again: http://www.linuximq.net ++ * ++ * ++ * 2004/06/30 - New version of IMQ patch to kernels <=2.6.7 ++ * including the following changes: ++ * ++ * - Correction of ipv6 support "+"s issue (Hasso Tepper) ++ * - Correction of imq_init_devs() issue that resulted in ++ * kernel OOPS unloading IMQ as module (Norbert Buchmuller) ++ * - Addition of functionality to choose number of IMQ devices ++ * during kernel config (Andre Correa) ++ * - Addition of functionality to choose how IMQ hooks on ++ * PRE and POSTROUTING (after or before NAT) (Andre Correa) ++ * - Cosmetic corrections (Norbert Buchmuller) (Andre Correa) ++ * ++ * ++ * 2005/12/16 - IMQ versions between 2.6.7 and 2.6.13 were ++ * released with almost no problems. 2.6.14-x was released ++ * with some important changes: nfcache was removed; After ++ * some weeks of trouble we figured out that some IMQ fields ++ * in skb were missing in skbuff.c - skb_clone and copy_skb_header. ++ * These functions are correctly patched by this new patch version. ++ * ++ * Thanks for all who helped to figure out all the problems with ++ * 2.6.14.x: Patrick McHardy, Rune Kock, VeNoMouS, Max CtRiX, ++ * Kevin Shanahan, Richard Lucassen, Valery Dachev (hopefully ++ * I didn't forget anybody). I apologize again for my lack of time. ++ * ++ * ++ * 2008/06/17 - 2.6.25 - Changed imq.c to use qdisc_run() instead ++ * of qdisc_restart() and moved qdisc_run() to tasklet to avoid ++ * recursive locking. New initialization routines to fix 'rmmod' not ++ * working anymore. Used code from ifb.c. (Jussi Kivilinna) ++ * ++ * 2008/08/06 - 2.6.26 - (JK) ++ * - Replaced tasklet with 'netif_schedule()'. ++ * - Cleaned up and added comments for imq_nf_queue(). ++ * ++ * 2009/04/12 ++ * - Add skb_save_cb/skb_restore_cb helper functions for backuping ++ * control buffer. This is needed because qdisc-layer on kernels ++ * 2.6.27 and newer overwrite control buffer. (Jussi Kivilinna) ++ * - Add better locking for IMQ device. Hopefully this will solve ++ * SMP issues. (Jussi Kivilinna) ++ * - Port to 2.6.27 ++ * - Port to 2.6.28 ++ * - Port to 2.6.29 + fix rmmod not working ++ * ++ * 2009/04/20 - (Jussi Kivilinna) ++ * - Use netdevice feature flags to avoid extra packet handling ++ * by core networking layer and possibly increase performance. ++ * ++ * 2009/09/26 - (Jussi Kivilinna) ++ * - Add imq_nf_reinject_lockless to fix deadlock with ++ * imq_nf_queue/imq_nf_reinject. ++ * ++ * 2009/12/08 - (Jussi Kivilinna) ++ * - Port to 2.6.32 ++ * - Add check for skb->nf_queue_entry==NULL in imq_dev_xmit() ++ * - Also add better error checking for skb->nf_queue_entry usage ++ * ++ * 2010/02/25 - (Jussi Kivilinna) ++ * - Port to 2.6.33 ++ * ++ * 2010/08/12 - (Jussi Kivilinna) ++ * - Port to 2.6.35 ++ * ++ * Also, many thanks to pablo Sebastian Greco for making the initial ++ * patch and to those who helped the testing. ++ * ++ * More info at: http://www.linuximq.net/ (Andre Correa) ++ */ ++ ++#include <linux/module.h> ++#include <linux/kernel.h> ++#include <linux/moduleparam.h> ++#include <linux/list.h> ++#include <linux/skbuff.h> ++#include <linux/netdevice.h> ++#include <linux/etherdevice.h> ++#include <linux/rtnetlink.h> ++#include <linux/if_arp.h> ++#include <linux/netfilter.h> ++#include <linux/netfilter_ipv4.h> ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++ #include <linux/netfilter_ipv6.h> ++#endif ++#include <linux/imq.h> ++#include <net/pkt_sched.h> ++#include <net/netfilter/nf_queue.h> ++ ++static nf_hookfn imq_nf_hook; ++ ++static struct nf_hook_ops imq_ingress_ipv4 = { ++ .hook = imq_nf_hook, ++ .owner = THIS_MODULE, ++ .pf = PF_INET, ++ .hooknum = NF_INET_PRE_ROUTING, ++#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) ++ .priority = NF_IP_PRI_MANGLE + 1 ++#else ++ .priority = NF_IP_PRI_NAT_DST + 1 ++#endif ++}; ++ ++static struct nf_hook_ops imq_egress_ipv4 = { ++ .hook = imq_nf_hook, ++ .owner = THIS_MODULE, ++ .pf = PF_INET, ++ .hooknum = NF_INET_POST_ROUTING, ++#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA) ++ .priority = NF_IP_PRI_LAST ++#else ++ .priority = NF_IP_PRI_NAT_SRC - 1 ++#endif ++}; ++ ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++static struct nf_hook_ops imq_ingress_ipv6 = { ++ .hook = imq_nf_hook, ++ .owner = THIS_MODULE, ++ .pf = PF_INET6, ++ .hooknum = NF_INET_PRE_ROUTING, ++#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) ++ .priority = NF_IP6_PRI_MANGLE + 1 ++#else ++ .priority = NF_IP6_PRI_NAT_DST + 1 ++#endif ++}; ++ ++static struct nf_hook_ops imq_egress_ipv6 = { ++ .hook = imq_nf_hook, ++ .owner = THIS_MODULE, ++ .pf = PF_INET6, ++ .hooknum = NF_INET_POST_ROUTING, ++#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA) ++ .priority = NF_IP6_PRI_LAST ++#else ++ .priority = NF_IP6_PRI_NAT_SRC - 1 ++#endif ++}; ++#endif ++ ++#if defined(CONFIG_IMQ_NUM_DEVS) ++static unsigned int numdevs = CONFIG_IMQ_NUM_DEVS; ++#else ++static unsigned int numdevs = IMQ_MAX_DEVS; ++#endif ++ ++static DEFINE_SPINLOCK(imq_nf_queue_lock); ++ ++static struct net_device *imq_devs_cache[IMQ_MAX_DEVS]; ++ ++ ++static struct net_device_stats *imq_get_stats(struct net_device *dev) ++{ ++ return &dev->stats; ++} ++ ++/* called for packets kfree'd in qdiscs at places other than enqueue */ ++static void imq_skb_destructor(struct sk_buff *skb) ++{ ++ struct nf_queue_entry *entry = skb->nf_queue_entry; ++ ++ skb->nf_queue_entry = NULL; ++ ++ if (entry) { ++ nf_queue_entry_release_refs(entry); ++ kfree(entry); ++ } ++ ++ skb_restore_cb(skb); /* kfree backup */ ++} ++ ++/* locking not needed when called from imq_nf_queue */ ++static void imq_nf_reinject_lockless(struct nf_queue_entry *entry, ++ unsigned int verdict) ++{ ++ int status; ++ ++ if (!entry->next_outfn) { ++ nf_reinject(entry, verdict); ++ return; ++ } ++ ++ status = entry->next_outfn(entry, entry->next_queuenum); ++ if (status < 0) { ++ nf_queue_entry_release_refs(entry); ++ kfree_skb(entry->skb); ++ kfree(entry); ++ } ++} ++ ++static void imq_nf_reinject(struct nf_queue_entry *entry, unsigned int verdict) ++{ ++ int status; ++ ++ if (!entry->next_outfn) { ++ spin_lock_bh(&imq_nf_queue_lock); ++ nf_reinject(entry, verdict); ++ spin_unlock_bh(&imq_nf_queue_lock); ++ return; ++ } ++ ++ rcu_read_lock(); ++ local_bh_disable(); ++ status = entry->next_outfn(entry, entry->next_queuenum); ++ local_bh_enable(); ++ if (status < 0) { ++ nf_queue_entry_release_refs(entry); ++ kfree_skb(entry->skb); ++ kfree(entry); ++ } ++ ++ rcu_read_unlock(); ++} ++ ++static netdev_tx_t imq_dev_xmit(struct sk_buff *skb, struct net_device *dev) ++{ ++ struct nf_queue_entry *entry = skb->nf_queue_entry; ++ ++ skb->nf_queue_entry = NULL; ++ dev->trans_start = jiffies; ++ ++ dev->stats.tx_bytes += skb->len; ++ dev->stats.tx_packets++; ++ ++ if (entry == NULL) { ++ /* We don't know what is going on here.. packet is queued for ++ * imq device, but (probably) not by us. ++ * ++ * If this packet was not send here by imq_nf_queue(), then ++ * skb_save_cb() was not used and skb_free() should not show: ++ * WARNING: IMQ: kfree_skb: skb->cb_next:.. ++ * and/or ++ * WARNING: IMQ: kfree_skb: skb->nf_queue_entry... ++ * ++ * However if this message is shown, then IMQ is somehow broken ++ * and you should report this to linuximq.net. ++ */ ++ ++ /* imq_dev_xmit is black hole that eats all packets, report that ++ * we eat this packet happily and increase dropped counters. ++ */ ++ ++ dev->stats.tx_dropped++; ++ dev_kfree_skb(skb); ++ ++ return NETDEV_TX_OK; ++ } ++ ++ skb_restore_cb(skb); /* restore skb->cb */ ++ ++ skb->imq_flags = 0; ++ skb->destructor = NULL; ++ ++ imq_nf_reinject(entry, NF_ACCEPT); ++ ++ return NETDEV_TX_OK; ++} ++ ++static int imq_nf_queue(struct nf_queue_entry *entry, unsigned queue_num) ++{ ++ struct net_device *dev; ++ struct sk_buff *skb_orig, *skb, *skb_shared; ++ struct Qdisc *q; ++ struct netdev_queue *txq; ++ int users, index; ++ int retval = -EINVAL; ++ ++ index = entry->skb->imq_flags & IMQ_F_IFMASK; ++ if (unlikely(index > numdevs - 1)) { ++ if (net_ratelimit()) ++ printk(KERN_WARNING ++ "IMQ: invalid device specified, highest is %u\n", ++ numdevs - 1); ++ retval = -EINVAL; ++ goto out; ++ } ++ ++ /* check for imq device by index from cache */ ++ dev = imq_devs_cache[index]; ++ if (unlikely(!dev)) { ++ char buf[8]; ++ ++ /* get device by name and cache result */ ++ snprintf(buf, sizeof(buf), "imq%d", index); ++ dev = dev_get_by_name(&init_net, buf); ++ if (!dev) { ++ /* not found ?!*/ ++ BUG(); ++ retval = -ENODEV; ++ goto out; ++ } ++ ++ imq_devs_cache[index] = dev; ++ dev_put(dev); ++ } ++ ++ if (unlikely(!(dev->flags & IFF_UP))) { ++ entry->skb->imq_flags = 0; ++ imq_nf_reinject_lockless(entry, NF_ACCEPT); ++ retval = 0; ++ goto out; ++ } ++ dev->last_rx = jiffies; ++ ++ skb = entry->skb; ++ skb_orig = NULL; ++ ++ /* skb has owner? => make clone */ ++ if (unlikely(skb->destructor)) { ++ skb_orig = skb; ++ skb = skb_clone(skb, GFP_ATOMIC); ++ if (!skb) { ++ retval = -ENOMEM; ++ goto out; ++ } ++ entry->skb = skb; ++ } ++ ++ skb->nf_queue_entry = entry; ++ ++ dev->stats.rx_bytes += skb->len; ++ dev->stats.rx_packets++; ++ ++ txq = dev_pick_tx(dev, skb); ++ ++ q = rcu_dereference(txq->qdisc); ++ if (unlikely(!q->enqueue)) ++ goto packet_not_eaten_by_imq_dev; ++ ++ spin_lock_bh(qdisc_lock(q)); ++ ++ users = atomic_read(&skb->users); ++ ++ skb_shared = skb_get(skb); /* increase reference count by one */ ++ skb_save_cb(skb_shared); /* backup skb->cb, as qdisc layer will ++ overwrite it */ ++ qdisc_enqueue_root(skb_shared, q); /* might kfree_skb */ ++ ++ if (likely(atomic_read(&skb_shared->users) == users + 1)) { ++ kfree_skb(skb_shared); /* decrease reference count by one */ ++ ++ skb->destructor = &imq_skb_destructor; ++ ++ /* cloned? */ ++ if (skb_orig) ++ kfree_skb(skb_orig); /* free original */ ++ ++ spin_unlock_bh(qdisc_lock(q)); ++ ++ /* schedule qdisc dequeue */ ++ __netif_schedule(q); ++ ++ retval = 0; ++ goto out; ++ } else { ++ skb_restore_cb(skb_shared); /* restore skb->cb */ ++ skb->nf_queue_entry = NULL; ++ /* qdisc dropped packet and decreased skb reference count of ++ * skb, so we don't really want to and try refree as that would ++ * actually destroy the skb. */ ++ spin_unlock_bh(qdisc_lock(q)); ++ goto packet_not_eaten_by_imq_dev; ++ } ++ ++packet_not_eaten_by_imq_dev: ++ /* cloned? restore original */ ++ if (skb_orig) { ++ kfree_skb(skb); ++ entry->skb = skb_orig; ++ } ++ retval = -1; ++out: ++ return retval; ++} ++ ++static struct nf_queue_handler nfqh = { ++ .name = "imq", ++ .outfn = imq_nf_queue, ++}; ++ ++static unsigned int imq_nf_hook(unsigned int hook, struct sk_buff *pskb, ++ const struct net_device *indev, ++ const struct net_device *outdev, ++ int (*okfn)(struct sk_buff *)) ++{ ++ if (pskb->imq_flags & IMQ_F_ENQUEUE) ++ return NF_QUEUE; ++ ++ return NF_ACCEPT; ++} ++ ++static int imq_close(struct net_device *dev) ++{ ++ netif_stop_queue(dev); ++ return 0; ++} ++ ++static int imq_open(struct net_device *dev) ++{ ++ netif_start_queue(dev); ++ return 0; ++} ++ ++static const struct net_device_ops imq_netdev_ops = { ++ .ndo_open = imq_open, ++ .ndo_stop = imq_close, ++ .ndo_start_xmit = imq_dev_xmit, ++ .ndo_get_stats = imq_get_stats, ++}; ++ ++static void imq_setup(struct net_device *dev) ++{ ++ dev->netdev_ops = &imq_netdev_ops; ++ dev->type = ARPHRD_VOID; ++ dev->mtu = 16000; ++ dev->tx_queue_len = 11000; ++ dev->flags = IFF_NOARP; ++ dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | ++ NETIF_F_GSO | NETIF_F_HW_CSUM | ++ NETIF_F_HIGHDMA; ++ dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; ++} ++ ++static int imq_validate(struct nlattr *tb[], struct nlattr *data[]) ++{ ++ int ret = 0; ++ ++ if (tb[IFLA_ADDRESS]) { ++ if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { ++ ret = -EINVAL; ++ goto end; ++ } ++ if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { ++ ret = -EADDRNOTAVAIL; ++ goto end; ++ } ++ } ++ return 0; ++end: ++ printk(KERN_WARNING "IMQ: imq_validate failed (%d)\n", ret); ++ return ret; ++} ++ ++static struct rtnl_link_ops imq_link_ops __read_mostly = { ++ .kind = "imq", ++ .priv_size = 0, ++ .setup = imq_setup, ++ .validate = imq_validate, ++}; ++ ++static int __init imq_init_hooks(void) ++{ ++ int err; ++ ++ nf_register_queue_imq_handler(&nfqh); ++ ++ err = nf_register_hook(&imq_ingress_ipv4); ++ if (err) ++ goto err1; ++ ++ err = nf_register_hook(&imq_egress_ipv4); ++ if (err) ++ goto err2; ++ ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++ err = nf_register_hook(&imq_ingress_ipv6); ++ if (err) ++ goto err3; ++ ++ err = nf_register_hook(&imq_egress_ipv6); ++ if (err) ++ goto err4; ++#endif ++ ++ return 0; ++ ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++err4: ++ nf_unregister_hook(&imq_ingress_ipv6); ++err3: ++ nf_unregister_hook(&imq_egress_ipv4); ++#endif ++err2: ++ nf_unregister_hook(&imq_ingress_ipv4); ++err1: ++ nf_unregister_queue_imq_handler(); ++ return err; ++} ++ ++static int __init imq_init_one(int index) ++{ ++ struct net_device *dev; ++ int ret; ++ ++ dev = alloc_netdev(0, "imq%d", imq_setup); ++ if (!dev) ++ return -ENOMEM; ++ ++ ret = dev_alloc_name(dev, dev->name); ++ if (ret < 0) ++ goto fail; ++ ++ dev->rtnl_link_ops = &imq_link_ops; ++ ret = register_netdevice(dev); ++ if (ret < 0) ++ goto fail; ++ ++ return 0; ++fail: ++ free_netdev(dev); ++ return ret; ++} ++ ++static int __init imq_init_devs(void) ++{ ++ int err, i; ++ ++ if (numdevs < 1 || numdevs > IMQ_MAX_DEVS) { ++ printk(KERN_ERR "IMQ: numdevs has to be betweed 1 and %u\n", ++ IMQ_MAX_DEVS); ++ return -EINVAL; ++ } ++ ++ rtnl_lock(); ++ err = __rtnl_link_register(&imq_link_ops); ++ ++ for (i = 0; i < numdevs && !err; i++) ++ err = imq_init_one(i); ++ ++ if (err) { ++ __rtnl_link_unregister(&imq_link_ops); ++ memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); ++ } ++ rtnl_unlock(); ++ ++ return err; ++} ++ ++static int __init imq_init_module(void) ++{ ++ int err; ++ ++#if defined(CONFIG_IMQ_NUM_DEVS) ++ BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS > 16); ++ BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS < 2); ++ BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS - 1 > IMQ_F_IFMASK); ++#endif ++ ++ err = imq_init_devs(); ++ if (err) { ++ printk(KERN_ERR "IMQ: Error trying imq_init_devs(net)\n"); ++ return err; ++ } ++ ++ err = imq_init_hooks(); ++ if (err) { ++ printk(KERN_ERR "IMQ: Error trying imq_init_hooks()\n"); ++ rtnl_link_unregister(&imq_link_ops); ++ memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); ++ return err; ++ } ++ ++ printk(KERN_INFO "IMQ driver loaded successfully.\n"); ++ ++#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) ++ printk(KERN_INFO "\tHooking IMQ before NAT on PREROUTING.\n"); ++#else ++ printk(KERN_INFO "\tHooking IMQ after NAT on PREROUTING.\n"); ++#endif ++#if defined(CONFIG_IMQ_BEHAVIOR_AB) || defined(CONFIG_IMQ_BEHAVIOR_BB) ++ printk(KERN_INFO "\tHooking IMQ before NAT on POSTROUTING.\n"); ++#else ++ printk(KERN_INFO "\tHooking IMQ after NAT on POSTROUTING.\n"); ++#endif ++ ++ return 0; ++} ++ ++static void __exit imq_unhook(void) ++{ ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++ nf_unregister_hook(&imq_ingress_ipv6); ++ nf_unregister_hook(&imq_egress_ipv6); ++#endif ++ nf_unregister_hook(&imq_ingress_ipv4); ++ nf_unregister_hook(&imq_egress_ipv4); ++ ++ nf_unregister_queue_imq_handler(); ++} ++ ++static void __exit imq_cleanup_devs(void) ++{ ++ rtnl_link_unregister(&imq_link_ops); ++ memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); ++} ++ ++static void __exit imq_exit_module(void) ++{ ++ imq_unhook(); ++ imq_cleanup_devs(); ++ printk(KERN_INFO "IMQ driver unloaded successfully.\n"); ++} ++ ++module_init(imq_init_module); ++module_exit(imq_exit_module); ++ ++module_param(numdevs, int, 0); ++MODULE_PARM_DESC(numdevs, "number of IMQ devices (how many imq* devices will " ++ "be created)"); ++MODULE_AUTHOR("http://www.linuximq.net"); ++MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See " ++ "http://www.linuximq.net/ for more information."); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS_RTNL_LINK("imq"); ++ +--- a/drivers/net/Kconfig ++++ b/drivers/net/Kconfig +@@ -121,6 +121,129 @@ config EQUALIZER + To compile this driver as a module, choose M here: the module + will be called eql. If unsure, say N. + ++config IMQ ++ tristate "IMQ (intermediate queueing device) support" ++ depends on NETDEVICES && NETFILTER ++ ---help--- ++ The IMQ device(s) is used as placeholder for QoS queueing ++ disciplines. Every packet entering/leaving the IP stack can be ++ directed through the IMQ device where it's enqueued/dequeued to the ++ attached qdisc. This allows you to treat network devices as classes ++ and distribute bandwidth among them. Iptables is used to specify ++ through which IMQ device, if any, packets travel. ++ ++ More information at: http://www.linuximq.net/ ++ ++ To compile this driver as a module, choose M here: the module ++ will be called imq. If unsure, say N. ++ ++choice ++ prompt "IMQ behavior (PRE/POSTROUTING)" ++ depends on IMQ ++ default IMQ_BEHAVIOR_AB ++ help ++ ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ IMQ can work in any of the following ways: ++ ++ PREROUTING | POSTROUTING ++ -----------------|------------------- ++ #1 After NAT | After NAT ++ #2 After NAT | Before NAT ++ #3 Before NAT | After NAT ++ #4 Before NAT | Before NAT ++ ++ The default behavior is to hook before NAT on PREROUTING ++ and after NAT on POSTROUTING (#3). ++ ++ This settings are specially usefull when trying to use IMQ ++ to shape NATed clients. ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++config IMQ_BEHAVIOR_AA ++ bool "IMQ AA" ++ help ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ Choosing this option will make IMQ hook like this: ++ ++ PREROUTING: After NAT ++ POSTROUTING: After NAT ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++config IMQ_BEHAVIOR_AB ++ bool "IMQ AB" ++ help ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ Choosing this option will make IMQ hook like this: ++ ++ PREROUTING: After NAT ++ POSTROUTING: Before NAT ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++config IMQ_BEHAVIOR_BA ++ bool "IMQ BA" ++ help ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ Choosing this option will make IMQ hook like this: ++ ++ PREROUTING: Before NAT ++ POSTROUTING: After NAT ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++config IMQ_BEHAVIOR_BB ++ bool "IMQ BB" ++ help ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ Choosing this option will make IMQ hook like this: ++ ++ PREROUTING: Before NAT ++ POSTROUTING: Before NAT ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++endchoice ++ ++config IMQ_NUM_DEVS ++ ++ int "Number of IMQ devices" ++ range 2 16 ++ depends on IMQ ++ default "16" ++ help ++ ++ This settings defines how many IMQ devices will be ++ created. ++ ++ The default value is 16. ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ + config TUN + tristate "Universal TUN/TAP device driver support" + select CRC32 +--- a/drivers/net/Makefile ++++ b/drivers/net/Makefile +@@ -169,6 +169,7 @@ obj-$(CONFIG_SLHC) += slhc.o + obj-$(CONFIG_XEN_NETDEV_FRONTEND) += xen-netfront.o + + obj-$(CONFIG_DUMMY) += dummy.o ++obj-$(CONFIG_IMQ) += imq.o + obj-$(CONFIG_IFB) += ifb.o + obj-$(CONFIG_MACVLAN) += macvlan.o + obj-$(CONFIG_MACVTAP) += macvtap.o +--- /dev/null ++++ b/include/linux/imq.h +@@ -0,0 +1,13 @@ ++#ifndef _IMQ_H ++#define _IMQ_H ++ ++/* IFMASK (16 device indexes, 0 to 15) and flag(s) fit in 5 bits */ ++#define IMQ_F_BITS 5 ++ ++#define IMQ_F_IFMASK 0x0f ++#define IMQ_F_ENQUEUE 0x10 ++ ++#define IMQ_MAX_DEVS (IMQ_F_IFMASK + 1) ++ ++#endif /* _IMQ_H */ ++ +--- a/include/linux/netdevice.h ++++ b/include/linux/netdevice.h +@@ -1295,6 +1295,7 @@ extern int dev_alloc_name(struct net_de + extern int dev_open(struct net_device *dev); + extern int dev_close(struct net_device *dev); + extern void dev_disable_lro(struct net_device *dev); ++extern struct netdev_queue *dev_pick_tx(struct net_device *dev, struct sk_buff *skb); + extern int dev_queue_xmit(struct sk_buff *skb); + extern int register_netdevice(struct net_device *dev); + extern void unregister_netdevice_queue(struct net_device *dev, +--- /dev/null ++++ b/include/linux/netfilter/xt_IMQ.h +@@ -0,0 +1,9 @@ ++#ifndef _XT_IMQ_H ++#define _XT_IMQ_H ++ ++struct xt_imq_info { ++ unsigned int todev; /* target imq device */ ++}; ++ ++#endif /* _XT_IMQ_H */ ++ +--- /dev/null ++++ b/include/linux/netfilter_ipv4/ipt_IMQ.h +@@ -0,0 +1,10 @@ ++#ifndef _IPT_IMQ_H ++#define _IPT_IMQ_H ++ ++/* Backwards compatibility for old userspace */ ++#include <linux/netfilter/xt_IMQ.h> ++ ++#define ipt_imq_info xt_imq_info ++ ++#endif /* _IPT_IMQ_H */ ++ +--- /dev/null ++++ b/include/linux/netfilter_ipv6/ip6t_IMQ.h +@@ -0,0 +1,10 @@ ++#ifndef _IP6T_IMQ_H ++#define _IP6T_IMQ_H ++ ++/* Backwards compatibility for old userspace */ ++#include <linux/netfilter/xt_IMQ.h> ++ ++#define ip6t_imq_info xt_imq_info ++ ++#endif /* _IP6T_IMQ_H */ ++ +--- a/include/linux/skbuff.h ++++ b/include/linux/skbuff.h +@@ -29,6 +29,9 @@ + #include <linux/rcupdate.h> + #include <linux/dmaengine.h> + #include <linux/hrtimer.h> ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++#include <linux/imq.h> ++#endif + + /* Don't change this without changing skb_csum_unnecessary! */ + #define CHECKSUM_NONE 0 +@@ -330,6 +333,9 @@ struct sk_buff { + * first. This is owned by whoever has the skb queued ATM. + */ + char cb[48] __aligned(8); ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ void *cb_next; ++#endif + + unsigned long _skb_refdst; + #ifdef CONFIG_XFRM +@@ -366,6 +372,9 @@ struct sk_buff { + struct nf_conntrack *nfct; + struct sk_buff *nfct_reasm; + #endif ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ struct nf_queue_entry *nf_queue_entry; ++#endif + #ifdef CONFIG_BRIDGE_NETFILTER + struct nf_bridge_info *nf_bridge; + #endif +@@ -392,6 +401,10 @@ struct sk_buff { + + /* 0/14 bit hole */ + ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ __u8 imq_flags:IMQ_F_BITS; ++#endif ++ + #ifdef CONFIG_NET_DMA + dma_cookie_t dma_cookie; + #endif +@@ -490,6 +503,12 @@ static inline struct rtable *skb_rtable( + return (struct rtable *)skb_dst(skb); + } + ++ ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++extern int skb_save_cb(struct sk_buff *skb); ++extern int skb_restore_cb(struct sk_buff *skb); ++#endif ++ + extern void kfree_skb(struct sk_buff *skb); + extern void consume_skb(struct sk_buff *skb); + extern void __kfree_skb(struct sk_buff *skb); +@@ -2096,6 +2115,10 @@ static inline void __nf_copy(struct sk_b + dst->nfct_reasm = src->nfct_reasm; + nf_conntrack_get_reasm(src->nfct_reasm); + #endif ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ dst->imq_flags = src->imq_flags; ++ dst->nf_queue_entry = src->nf_queue_entry; ++#endif + #ifdef CONFIG_BRIDGE_NETFILTER + dst->nf_bridge = src->nf_bridge; + nf_bridge_get(src->nf_bridge); +--- a/include/net/netfilter/nf_queue.h ++++ b/include/net/netfilter/nf_queue.h +@@ -13,6 +13,12 @@ struct nf_queue_entry { + struct net_device *indev; + struct net_device *outdev; + int (*okfn)(struct sk_buff *); ++ ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ int (*next_outfn)(struct nf_queue_entry *entry, ++ unsigned int queuenum); ++ unsigned int next_queuenum; ++#endif + }; + + #define nf_queue_entry_reroute(x) ((void *)x + sizeof(struct nf_queue_entry)) +@@ -30,5 +36,11 @@ extern int nf_unregister_queue_handler(u + const struct nf_queue_handler *qh); + extern void nf_unregister_queue_handlers(const struct nf_queue_handler *qh); + extern void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict); ++extern void nf_queue_entry_release_refs(struct nf_queue_entry *entry); ++ ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++extern void nf_register_queue_imq_handler(const struct nf_queue_handler *qh); ++extern void nf_unregister_queue_imq_handler(void); ++#endif + + #endif /* _NF_QUEUE_H */ +--- a/net/core/dev.c ++++ b/net/core/dev.c +@@ -98,6 +98,9 @@ + #include <net/net_namespace.h> + #include <net/sock.h> + #include <linux/rtnetlink.h> ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++#include <linux/imq.h> ++#endif + #include <linux/proc_fs.h> + #include <linux/seq_file.h> + #include <linux/stat.h> +@@ -1942,7 +1945,11 @@ int dev_hard_start_xmit(struct sk_buff * + int rc = NETDEV_TX_OK; + + if (likely(!skb->next)) { +- if (!list_empty(&ptype_all)) ++ if (!list_empty(&ptype_all) ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ && !(skb->imq_flags & IMQ_F_ENQUEUE) ++#endif ++ ) + dev_queue_xmit_nit(skb, dev); + + /* +@@ -2054,8 +2061,7 @@ static inline u16 dev_cap_txqueue(struct + return queue_index; + } + +-static struct netdev_queue *dev_pick_tx(struct net_device *dev, +- struct sk_buff *skb) ++struct netdev_queue *dev_pick_tx(struct net_device *dev, struct sk_buff *skb) + { + int queue_index; + const struct net_device_ops *ops = dev->netdev_ops; +@@ -2084,6 +2090,7 @@ static struct netdev_queue *dev_pick_tx( + skb_set_queue_mapping(skb, queue_index); + return netdev_get_tx_queue(dev, queue_index); + } ++EXPORT_SYMBOL(dev_pick_tx); + + static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, + struct net_device *dev, +--- a/net/core/skbuff.c ++++ b/net/core/skbuff.c +@@ -72,6 +72,9 @@ + + static struct kmem_cache *skbuff_head_cache __read_mostly; + static struct kmem_cache *skbuff_fclone_cache __read_mostly; ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++static struct kmem_cache *skbuff_cb_store_cache __read_mostly; ++#endif + + static void sock_pipe_buf_release(struct pipe_inode_info *pipe, + struct pipe_buffer *buf) +@@ -91,6 +94,83 @@ static int sock_pipe_buf_steal(struct pi + return 1; + } + ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++/* Control buffer save/restore for IMQ devices */ ++struct skb_cb_table { ++ void *cb_next; ++ atomic_t refcnt; ++ char cb[48]; ++}; ++ ++static DEFINE_SPINLOCK(skb_cb_store_lock); ++ ++int skb_save_cb(struct sk_buff *skb) ++{ ++ struct skb_cb_table *next; ++ ++ next = kmem_cache_alloc(skbuff_cb_store_cache, GFP_ATOMIC); ++ if (!next) ++ return -ENOMEM; ++ ++ BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb)); ++ ++ memcpy(next->cb, skb->cb, sizeof(skb->cb)); ++ next->cb_next = skb->cb_next; ++ ++ atomic_set(&next->refcnt, 1); ++ ++ skb->cb_next = next; ++ return 0; ++} ++EXPORT_SYMBOL(skb_save_cb); ++ ++int skb_restore_cb(struct sk_buff *skb) ++{ ++ struct skb_cb_table *next; ++ ++ if (!skb->cb_next) ++ return 0; ++ ++ next = skb->cb_next; ++ ++ BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb)); ++ ++ memcpy(skb->cb, next->cb, sizeof(skb->cb)); ++ skb->cb_next = next->cb_next; ++ ++ spin_lock(&skb_cb_store_lock); ++ ++ if (atomic_dec_and_test(&next->refcnt)) { ++ kmem_cache_free(skbuff_cb_store_cache, next); ++ } ++ ++ spin_unlock(&skb_cb_store_lock); ++ ++ return 0; ++} ++EXPORT_SYMBOL(skb_restore_cb); ++ ++static void skb_copy_stored_cb(struct sk_buff *new, const struct sk_buff *__old) ++{ ++ struct skb_cb_table *next; ++ struct sk_buff *old; ++ ++ if (!__old->cb_next) { ++ new->cb_next = NULL; ++ return; ++ } ++ ++ spin_lock(&skb_cb_store_lock); ++ ++ old = (struct sk_buff *)__old; ++ ++ next = old->cb_next; ++ atomic_inc(&next->refcnt); ++ new->cb_next = next; ++ ++ spin_unlock(&skb_cb_store_lock); ++} ++#endif + + /* Pipe buffer operations for a socket. */ + static const struct pipe_buf_operations sock_pipe_buf_ops = { +@@ -391,6 +471,26 @@ static void skb_release_head_state(struc + WARN_ON(in_irq()); + skb->destructor(skb); + } ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ /* This should not happen. When it does, avoid memleak by restoring ++ the chain of cb-backups. */ ++ while(skb->cb_next != NULL) { ++ if (net_ratelimit()) ++ printk(KERN_WARNING "IMQ: kfree_skb: skb->cb_next: " ++ "%08x\n", (unsigned int)skb->cb_next); ++ ++ skb_restore_cb(skb); ++ } ++ /* This should not happen either, nf_queue_entry is nullified in ++ * imq_dev_xmit(). If we have non-NULL nf_queue_entry then we are ++ * leaking entry pointers, maybe memory. We don't know if this is ++ * pointer to already freed memory, or should this be freed. ++ * If this happens we need to add refcounting, etc for nf_queue_entry. ++ */ ++ if (skb->nf_queue_entry && net_ratelimit()) ++ printk(KERN_WARNING ++ "IMQ: kfree_skb: skb->nf_queue_entry != NULL"); ++#endif + #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) + nf_conntrack_put(skb->nfct); + nf_conntrack_put_reasm(skb->nfct_reasm); +@@ -526,6 +626,9 @@ static void __copy_skb_header(struct sk_ + new->sp = secpath_get(old->sp); + #endif + memcpy(new->cb, old->cb, sizeof(old->cb)); ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ skb_copy_stored_cb(new, old); ++#endif + new->csum = old->csum; + new->local_df = old->local_df; + new->pkt_type = old->pkt_type; +@@ -2779,6 +2882,13 @@ void __init skb_init(void) + 0, + SLAB_HWCACHE_ALIGN|SLAB_PANIC, + NULL); ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ skbuff_cb_store_cache = kmem_cache_create("skbuff_cb_store_cache", ++ sizeof(struct skb_cb_table), ++ 0, ++ SLAB_HWCACHE_ALIGN|SLAB_PANIC, ++ NULL); ++#endif + } + + /** +--- a/net/netfilter/Kconfig ++++ b/net/netfilter/Kconfig +@@ -455,6 +455,18 @@ config NETFILTER_XT_TARGET_LED + For more information on the LEDs available on your system, see + Documentation/leds-class.txt + ++config NETFILTER_XT_TARGET_IMQ ++ tristate '"IMQ" target support' ++ depends on NETFILTER_XTABLES ++ depends on IP_NF_MANGLE || IP6_NF_MANGLE ++ select IMQ ++ default m if NETFILTER_ADVANCED=n ++ help ++ This option adds a `IMQ' target which is used to specify if and ++ to which imq device packets should get enqueued/dequeued. ++ ++ To compile it as a module, choose M here. If unsure, say N. ++ + config NETFILTER_XT_TARGET_MARK + tristate '"MARK" target support' + depends on NETFILTER_ADVANCED +--- a/net/netfilter/Makefile ++++ b/net/netfilter/Makefile +@@ -51,6 +51,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSEC + obj-$(CONFIG_NETFILTER_XT_TARGET_CT) += xt_CT.o + obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o + obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o ++obj-$(CONFIG_NETFILTER_XT_TARGET_IMQ) += xt_IMQ.o + obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o + obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o + obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o +--- a/net/netfilter/nf_queue.c ++++ b/net/netfilter/nf_queue.c +@@ -22,6 +22,26 @@ static const struct nf_queue_handler *qu + + static DEFINE_MUTEX(queue_handler_mutex); + ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++static const struct nf_queue_handler *queue_imq_handler; ++ ++void nf_register_queue_imq_handler(const struct nf_queue_handler *qh) ++{ ++ mutex_lock(&queue_handler_mutex); ++ rcu_assign_pointer(queue_imq_handler, qh); ++ mutex_unlock(&queue_handler_mutex); ++} ++EXPORT_SYMBOL(nf_register_queue_imq_handler); ++ ++void nf_unregister_queue_imq_handler(void) ++{ ++ mutex_lock(&queue_handler_mutex); ++ rcu_assign_pointer(queue_imq_handler, NULL); ++ mutex_unlock(&queue_handler_mutex); ++} ++EXPORT_SYMBOL(nf_unregister_queue_imq_handler); ++#endif ++ + /* return EBUSY when somebody else is registered, return EEXIST if the + * same handler is registered, return 0 in case of success. */ + int nf_register_queue_handler(u_int8_t pf, const struct nf_queue_handler *qh) +@@ -82,7 +102,7 @@ void nf_unregister_queue_handlers(const + } + EXPORT_SYMBOL_GPL(nf_unregister_queue_handlers); + +-static void nf_queue_entry_release_refs(struct nf_queue_entry *entry) ++void nf_queue_entry_release_refs(struct nf_queue_entry *entry) + { + /* Release those devices we held, or Alexey will kill me. */ + if (entry->indev) +@@ -102,6 +122,7 @@ static void nf_queue_entry_release_refs( + /* Drop reference to owner of hook which queued us. */ + module_put(entry->elem->owner); + } ++EXPORT_SYMBOL_GPL(nf_queue_entry_release_refs); + + /* + * Any packet that leaves via this function must come back +@@ -123,12 +144,26 @@ static int __nf_queue(struct sk_buff *sk + #endif + const struct nf_afinfo *afinfo; + const struct nf_queue_handler *qh; ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ const struct nf_queue_handler *qih = NULL; ++#endif + + /* QUEUE == DROP if noone is waiting, to be safe. */ + rcu_read_lock(); + + qh = rcu_dereference(queue_handler[pf]); ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++ if (pf == PF_INET || pf == PF_INET6) ++#else ++ if (pf == PF_INET) ++#endif ++ qih = rcu_dereference(queue_imq_handler); ++ ++ if (!qh && !qih) ++#else /* !IMQ */ + if (!qh) ++#endif + goto err_unlock; + + afinfo = nf_get_afinfo(pf); +@@ -147,6 +182,10 @@ static int __nf_queue(struct sk_buff *sk + .indev = indev, + .outdev = outdev, + .okfn = okfn, ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ .next_outfn = qh ? qh->outfn : NULL, ++ .next_queuenum = queuenum, ++#endif + }; + + /* If it's going away, ignore hook. */ +@@ -173,8 +212,19 @@ static int __nf_queue(struct sk_buff *sk + #endif + skb_dst_force(skb); + afinfo->saveroute(skb, entry); ++ ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ if (qih) { ++ status = qih->outfn(entry, queuenum); ++ goto imq_skip_queue; ++ } ++#endif ++ + status = qh->outfn(entry, queuenum); + ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++imq_skip_queue: ++#endif + rcu_read_unlock(); + + if (status < 0) { +--- /dev/null ++++ b/net/netfilter/xt_IMQ.c +@@ -0,0 +1,73 @@ ++/* ++ * This target marks packets to be enqueued to an imq device ++ */ ++#include <linux/module.h> ++#include <linux/skbuff.h> ++#include <linux/netfilter/x_tables.h> ++#include <linux/netfilter/xt_IMQ.h> ++#include <linux/imq.h> ++ ++static unsigned int imq_target(struct sk_buff *pskb, ++ const struct xt_action_param *par) ++{ ++ const struct xt_imq_info *mr = par->targinfo; ++ ++ pskb->imq_flags = (mr->todev & IMQ_F_IFMASK) | IMQ_F_ENQUEUE; ++ ++ return XT_CONTINUE; ++} ++ ++static int imq_checkentry(const struct xt_tgchk_param *par) ++{ ++ struct xt_imq_info *mr = par->targinfo; ++ ++ if (mr->todev > IMQ_MAX_DEVS - 1) { ++ printk(KERN_WARNING ++ "IMQ: invalid device specified, highest is %u\n", ++ IMQ_MAX_DEVS - 1); ++ return -EINVAL; ++ } ++ ++ return 0; ++} ++ ++static struct xt_target xt_imq_reg[] __read_mostly = { ++ { ++ .name = "IMQ", ++ .family = AF_INET, ++ .checkentry = imq_checkentry, ++ .target = imq_target, ++ .targetsize = sizeof(struct xt_imq_info), ++ .table = "mangle", ++ .me = THIS_MODULE ++ }, ++ { ++ .name = "IMQ", ++ .family = AF_INET6, ++ .checkentry = imq_checkentry, ++ .target = imq_target, ++ .targetsize = sizeof(struct xt_imq_info), ++ .table = "mangle", ++ .me = THIS_MODULE ++ }, ++}; ++ ++static int __init imq_init(void) ++{ ++ return xt_register_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg)); ++} ++ ++static void __exit imq_fini(void) ++{ ++ xt_unregister_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg)); ++} ++ ++module_init(imq_init); ++module_exit(imq_fini); ++ ++MODULE_AUTHOR("http://www.linuximq.net"); ++MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See http://www.linuximq.net/ for more information."); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS("ipt_IMQ"); ++MODULE_ALIAS("ip6t_IMQ"); ++ diff --git a/target/linux/generic/patches-2.6.37/150-netfilter_imq.patch b/target/linux/generic/patches-2.6.37/150-netfilter_imq.patch new file mode 100644 index 000000000..b71512615 --- /dev/null +++ b/target/linux/generic/patches-2.6.37/150-netfilter_imq.patch @@ -0,0 +1,1342 @@ +--- /dev/null ++++ b/drivers/net/imq.c +@@ -0,0 +1,638 @@ ++/* ++ * Pseudo-driver for the intermediate queue device. ++ * ++ * This program is free software; you can redistribute it and/or ++ * modify it under the terms of the GNU General Public License ++ * as published by the Free Software Foundation; either version ++ * 2 of the License, or (at your option) any later version. ++ * ++ * Authors: Patrick McHardy, <kaber@trash.net> ++ * ++ * The first version was written by Martin Devera, <devik@cdi.cz> ++ * ++ * Credits: Jan Rafaj <imq2t@cedric.vabo.cz> ++ * - Update patch to 2.4.21 ++ * Sebastian Strollo <sstrollo@nortelnetworks.com> ++ * - Fix "Dead-loop on netdevice imq"-issue ++ * Marcel Sebek <sebek64@post.cz> ++ * - Update to 2.6.2-rc1 ++ * ++ * After some time of inactivity there is a group taking care ++ * of IMQ again: http://www.linuximq.net ++ * ++ * ++ * 2004/06/30 - New version of IMQ patch to kernels <=2.6.7 ++ * including the following changes: ++ * ++ * - Correction of ipv6 support "+"s issue (Hasso Tepper) ++ * - Correction of imq_init_devs() issue that resulted in ++ * kernel OOPS unloading IMQ as module (Norbert Buchmuller) ++ * - Addition of functionality to choose number of IMQ devices ++ * during kernel config (Andre Correa) ++ * - Addition of functionality to choose how IMQ hooks on ++ * PRE and POSTROUTING (after or before NAT) (Andre Correa) ++ * - Cosmetic corrections (Norbert Buchmuller) (Andre Correa) ++ * ++ * ++ * 2005/12/16 - IMQ versions between 2.6.7 and 2.6.13 were ++ * released with almost no problems. 2.6.14-x was released ++ * with some important changes: nfcache was removed; After ++ * some weeks of trouble we figured out that some IMQ fields ++ * in skb were missing in skbuff.c - skb_clone and copy_skb_header. ++ * These functions are correctly patched by this new patch version. ++ * ++ * Thanks for all who helped to figure out all the problems with ++ * 2.6.14.x: Patrick McHardy, Rune Kock, VeNoMouS, Max CtRiX, ++ * Kevin Shanahan, Richard Lucassen, Valery Dachev (hopefully ++ * I didn't forget anybody). I apologize again for my lack of time. ++ * ++ * ++ * 2008/06/17 - 2.6.25 - Changed imq.c to use qdisc_run() instead ++ * of qdisc_restart() and moved qdisc_run() to tasklet to avoid ++ * recursive locking. New initialization routines to fix 'rmmod' not ++ * working anymore. Used code from ifb.c. (Jussi Kivilinna) ++ * ++ * 2008/08/06 - 2.6.26 - (JK) ++ * - Replaced tasklet with 'netif_schedule()'. ++ * - Cleaned up and added comments for imq_nf_queue(). ++ * ++ * 2009/04/12 ++ * - Add skb_save_cb/skb_restore_cb helper functions for backuping ++ * control buffer. This is needed because qdisc-layer on kernels ++ * 2.6.27 and newer overwrite control buffer. (Jussi Kivilinna) ++ * - Add better locking for IMQ device. Hopefully this will solve ++ * SMP issues. (Jussi Kivilinna) ++ * - Port to 2.6.27 ++ * - Port to 2.6.28 ++ * - Port to 2.6.29 + fix rmmod not working ++ * ++ * 2009/04/20 - (Jussi Kivilinna) ++ * - Use netdevice feature flags to avoid extra packet handling ++ * by core networking layer and possibly increase performance. ++ * ++ * 2009/09/26 - (Jussi Kivilinna) ++ * - Add imq_nf_reinject_lockless to fix deadlock with ++ * imq_nf_queue/imq_nf_reinject. ++ * ++ * 2009/12/08 - (Jussi Kivilinna) ++ * - Port to 2.6.32 ++ * - Add check for skb->nf_queue_entry==NULL in imq_dev_xmit() ++ * - Also add better error checking for skb->nf_queue_entry usage ++ * ++ * 2010/02/25 - (Jussi Kivilinna) ++ * - Port to 2.6.33 ++ * ++ * 2010/08/12 - (Jussi Kivilinna) ++ * - Port to 2.6.35 ++ * ++ * Also, many thanks to pablo Sebastian Greco for making the initial ++ * patch and to those who helped the testing. ++ * ++ * More info at: http://www.linuximq.net/ (Andre Correa) ++ */ ++ ++#include <linux/module.h> ++#include <linux/kernel.h> ++#include <linux/moduleparam.h> ++#include <linux/list.h> ++#include <linux/skbuff.h> ++#include <linux/netdevice.h> ++#include <linux/etherdevice.h> ++#include <linux/rtnetlink.h> ++#include <linux/if_arp.h> ++#include <linux/netfilter.h> ++#include <linux/netfilter_ipv4.h> ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++ #include <linux/netfilter_ipv6.h> ++#endif ++#include <linux/imq.h> ++#include <net/pkt_sched.h> ++#include <net/netfilter/nf_queue.h> ++ ++static nf_hookfn imq_nf_hook; ++ ++static struct nf_hook_ops imq_ingress_ipv4 = { ++ .hook = imq_nf_hook, ++ .owner = THIS_MODULE, ++ .pf = PF_INET, ++ .hooknum = NF_INET_PRE_ROUTING, ++#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) ++ .priority = NF_IP_PRI_MANGLE + 1 ++#else ++ .priority = NF_IP_PRI_NAT_DST + 1 ++#endif ++}; ++ ++static struct nf_hook_ops imq_egress_ipv4 = { ++ .hook = imq_nf_hook, ++ .owner = THIS_MODULE, ++ .pf = PF_INET, ++ .hooknum = NF_INET_POST_ROUTING, ++#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA) ++ .priority = NF_IP_PRI_LAST ++#else ++ .priority = NF_IP_PRI_NAT_SRC - 1 ++#endif ++}; ++ ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++static struct nf_hook_ops imq_ingress_ipv6 = { ++ .hook = imq_nf_hook, ++ .owner = THIS_MODULE, ++ .pf = PF_INET6, ++ .hooknum = NF_INET_PRE_ROUTING, ++#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) ++ .priority = NF_IP6_PRI_MANGLE + 1 ++#else ++ .priority = NF_IP6_PRI_NAT_DST + 1 ++#endif ++}; ++ ++static struct nf_hook_ops imq_egress_ipv6 = { ++ .hook = imq_nf_hook, ++ .owner = THIS_MODULE, ++ .pf = PF_INET6, ++ .hooknum = NF_INET_POST_ROUTING, ++#if defined(CONFIG_IMQ_BEHAVIOR_AA) || defined(CONFIG_IMQ_BEHAVIOR_BA) ++ .priority = NF_IP6_PRI_LAST ++#else ++ .priority = NF_IP6_PRI_NAT_SRC - 1 ++#endif ++}; ++#endif ++ ++#if defined(CONFIG_IMQ_NUM_DEVS) ++static unsigned int numdevs = CONFIG_IMQ_NUM_DEVS; ++#else ++static unsigned int numdevs = IMQ_MAX_DEVS; ++#endif ++ ++static DEFINE_SPINLOCK(imq_nf_queue_lock); ++ ++static struct net_device *imq_devs_cache[IMQ_MAX_DEVS]; ++ ++ ++static struct net_device_stats *imq_get_stats(struct net_device *dev) ++{ ++ return &dev->stats; ++} ++ ++/* called for packets kfree'd in qdiscs at places other than enqueue */ ++static void imq_skb_destructor(struct sk_buff *skb) ++{ ++ struct nf_queue_entry *entry = skb->nf_queue_entry; ++ ++ skb->nf_queue_entry = NULL; ++ ++ if (entry) { ++ nf_queue_entry_release_refs(entry); ++ kfree(entry); ++ } ++ ++ skb_restore_cb(skb); /* kfree backup */ ++} ++ ++/* locking not needed when called from imq_nf_queue */ ++static void imq_nf_reinject_lockless(struct nf_queue_entry *entry, ++ unsigned int verdict) ++{ ++ int status; ++ ++ if (!entry->next_outfn) { ++ nf_reinject(entry, verdict); ++ return; ++ } ++ ++ status = entry->next_outfn(entry, entry->next_queuenum); ++ if (status < 0) { ++ nf_queue_entry_release_refs(entry); ++ kfree_skb(entry->skb); ++ kfree(entry); ++ } ++} ++ ++static void imq_nf_reinject(struct nf_queue_entry *entry, unsigned int verdict) ++{ ++ int status; ++ ++ if (!entry->next_outfn) { ++ spin_lock_bh(&imq_nf_queue_lock); ++ nf_reinject(entry, verdict); ++ spin_unlock_bh(&imq_nf_queue_lock); ++ return; ++ } ++ ++ rcu_read_lock(); ++ local_bh_disable(); ++ status = entry->next_outfn(entry, entry->next_queuenum); ++ local_bh_enable(); ++ if (status < 0) { ++ nf_queue_entry_release_refs(entry); ++ kfree_skb(entry->skb); ++ kfree(entry); ++ } ++ ++ rcu_read_unlock(); ++} ++ ++static netdev_tx_t imq_dev_xmit(struct sk_buff *skb, struct net_device *dev) ++{ ++ struct nf_queue_entry *entry = skb->nf_queue_entry; ++ ++ skb->nf_queue_entry = NULL; ++ dev->trans_start = jiffies; ++ ++ dev->stats.tx_bytes += skb->len; ++ dev->stats.tx_packets++; ++ ++ if (entry == NULL) { ++ /* We don't know what is going on here.. packet is queued for ++ * imq device, but (probably) not by us. ++ * ++ * If this packet was not send here by imq_nf_queue(), then ++ * skb_save_cb() was not used and skb_free() should not show: ++ * WARNING: IMQ: kfree_skb: skb->cb_next:.. ++ * and/or ++ * WARNING: IMQ: kfree_skb: skb->nf_queue_entry... ++ * ++ * However if this message is shown, then IMQ is somehow broken ++ * and you should report this to linuximq.net. ++ */ ++ ++ /* imq_dev_xmit is black hole that eats all packets, report that ++ * we eat this packet happily and increase dropped counters. ++ */ ++ ++ dev->stats.tx_dropped++; ++ dev_kfree_skb(skb); ++ ++ return NETDEV_TX_OK; ++ } ++ ++ skb_restore_cb(skb); /* restore skb->cb */ ++ ++ skb->imq_flags = 0; ++ skb->destructor = NULL; ++ ++ imq_nf_reinject(entry, NF_ACCEPT); ++ ++ return NETDEV_TX_OK; ++} ++ ++static int imq_nf_queue(struct nf_queue_entry *entry, unsigned queue_num) ++{ ++ struct net_device *dev; ++ struct sk_buff *skb_orig, *skb, *skb_shared; ++ struct Qdisc *q; ++ struct netdev_queue *txq; ++ int users, index; ++ int retval = -EINVAL; ++ ++ index = entry->skb->imq_flags & IMQ_F_IFMASK; ++ if (unlikely(index > numdevs - 1)) { ++ if (net_ratelimit()) ++ printk(KERN_WARNING ++ "IMQ: invalid device specified, highest is %u\n", ++ numdevs - 1); ++ retval = -EINVAL; ++ goto out; ++ } ++ ++ /* check for imq device by index from cache */ ++ dev = imq_devs_cache[index]; ++ if (unlikely(!dev)) { ++ char buf[8]; ++ ++ /* get device by name and cache result */ ++ snprintf(buf, sizeof(buf), "imq%d", index); ++ dev = dev_get_by_name(&init_net, buf); ++ if (!dev) { ++ /* not found ?!*/ ++ BUG(); ++ retval = -ENODEV; ++ goto out; ++ } ++ ++ imq_devs_cache[index] = dev; ++ dev_put(dev); ++ } ++ ++ if (unlikely(!(dev->flags & IFF_UP))) { ++ entry->skb->imq_flags = 0; ++ imq_nf_reinject_lockless(entry, NF_ACCEPT); ++ retval = 0; ++ goto out; ++ } ++ dev->last_rx = jiffies; ++ ++ skb = entry->skb; ++ skb_orig = NULL; ++ ++ /* skb has owner? => make clone */ ++ if (unlikely(skb->destructor)) { ++ skb_orig = skb; ++ skb = skb_clone(skb, GFP_ATOMIC); ++ if (!skb) { ++ retval = -ENOMEM; ++ goto out; ++ } ++ entry->skb = skb; ++ } ++ ++ skb->nf_queue_entry = entry; ++ ++ dev->stats.rx_bytes += skb->len; ++ dev->stats.rx_packets++; ++ ++ txq = dev_pick_tx(dev, skb); ++ ++ q = rcu_dereference(txq->qdisc); ++ if (unlikely(!q->enqueue)) ++ goto packet_not_eaten_by_imq_dev; ++ ++ spin_lock_bh(qdisc_lock(q)); ++ ++ users = atomic_read(&skb->users); ++ ++ skb_shared = skb_get(skb); /* increase reference count by one */ ++ skb_save_cb(skb_shared); /* backup skb->cb, as qdisc layer will ++ overwrite it */ ++ qdisc_enqueue_root(skb_shared, q); /* might kfree_skb */ ++ ++ if (likely(atomic_read(&skb_shared->users) == users + 1)) { ++ kfree_skb(skb_shared); /* decrease reference count by one */ ++ ++ skb->destructor = &imq_skb_destructor; ++ ++ /* cloned? */ ++ if (skb_orig) ++ kfree_skb(skb_orig); /* free original */ ++ ++ spin_unlock_bh(qdisc_lock(q)); ++ ++ /* schedule qdisc dequeue */ ++ __netif_schedule(q); ++ ++ retval = 0; ++ goto out; ++ } else { ++ skb_restore_cb(skb_shared); /* restore skb->cb */ ++ skb->nf_queue_entry = NULL; ++ /* qdisc dropped packet and decreased skb reference count of ++ * skb, so we don't really want to and try refree as that would ++ * actually destroy the skb. */ ++ spin_unlock_bh(qdisc_lock(q)); ++ goto packet_not_eaten_by_imq_dev; ++ } ++ ++packet_not_eaten_by_imq_dev: ++ /* cloned? restore original */ ++ if (skb_orig) { ++ kfree_skb(skb); ++ entry->skb = skb_orig; ++ } ++ retval = -1; ++out: ++ return retval; ++} ++ ++static struct nf_queue_handler nfqh = { ++ .name = "imq", ++ .outfn = imq_nf_queue, ++}; ++ ++static unsigned int imq_nf_hook(unsigned int hook, struct sk_buff *pskb, ++ const struct net_device *indev, ++ const struct net_device *outdev, ++ int (*okfn)(struct sk_buff *)) ++{ ++ if (pskb->imq_flags & IMQ_F_ENQUEUE) ++ return NF_QUEUE; ++ ++ return NF_ACCEPT; ++} ++ ++static int imq_close(struct net_device *dev) ++{ ++ netif_stop_queue(dev); ++ return 0; ++} ++ ++static int imq_open(struct net_device *dev) ++{ ++ netif_start_queue(dev); ++ return 0; ++} ++ ++static const struct net_device_ops imq_netdev_ops = { ++ .ndo_open = imq_open, ++ .ndo_stop = imq_close, ++ .ndo_start_xmit = imq_dev_xmit, ++ .ndo_get_stats = imq_get_stats, ++}; ++ ++static void imq_setup(struct net_device *dev) ++{ ++ dev->netdev_ops = &imq_netdev_ops; ++ dev->type = ARPHRD_VOID; ++ dev->mtu = 16000; ++ dev->tx_queue_len = 11000; ++ dev->flags = IFF_NOARP; ++ dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | ++ NETIF_F_GSO | NETIF_F_HW_CSUM | ++ NETIF_F_HIGHDMA; ++ dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; ++} ++ ++static int imq_validate(struct nlattr *tb[], struct nlattr *data[]) ++{ ++ int ret = 0; ++ ++ if (tb[IFLA_ADDRESS]) { ++ if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { ++ ret = -EINVAL; ++ goto end; ++ } ++ if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { ++ ret = -EADDRNOTAVAIL; ++ goto end; ++ } ++ } ++ return 0; ++end: ++ printk(KERN_WARNING "IMQ: imq_validate failed (%d)\n", ret); ++ return ret; ++} ++ ++static struct rtnl_link_ops imq_link_ops __read_mostly = { ++ .kind = "imq", ++ .priv_size = 0, ++ .setup = imq_setup, ++ .validate = imq_validate, ++}; ++ ++static int __init imq_init_hooks(void) ++{ ++ int err; ++ ++ nf_register_queue_imq_handler(&nfqh); ++ ++ err = nf_register_hook(&imq_ingress_ipv4); ++ if (err) ++ goto err1; ++ ++ err = nf_register_hook(&imq_egress_ipv4); ++ if (err) ++ goto err2; ++ ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++ err = nf_register_hook(&imq_ingress_ipv6); ++ if (err) ++ goto err3; ++ ++ err = nf_register_hook(&imq_egress_ipv6); ++ if (err) ++ goto err4; ++#endif ++ ++ return 0; ++ ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++err4: ++ nf_unregister_hook(&imq_ingress_ipv6); ++err3: ++ nf_unregister_hook(&imq_egress_ipv4); ++#endif ++err2: ++ nf_unregister_hook(&imq_ingress_ipv4); ++err1: ++ nf_unregister_queue_imq_handler(); ++ return err; ++} ++ ++static int __init imq_init_one(int index) ++{ ++ struct net_device *dev; ++ int ret; ++ ++ dev = alloc_netdev(0, "imq%d", imq_setup); ++ if (!dev) ++ return -ENOMEM; ++ ++ ret = dev_alloc_name(dev, dev->name); ++ if (ret < 0) ++ goto fail; ++ ++ dev->rtnl_link_ops = &imq_link_ops; ++ ret = register_netdevice(dev); ++ if (ret < 0) ++ goto fail; ++ ++ return 0; ++fail: ++ free_netdev(dev); ++ return ret; ++} ++ ++static int __init imq_init_devs(void) ++{ ++ int err, i; ++ ++ if (numdevs < 1 || numdevs > IMQ_MAX_DEVS) { ++ printk(KERN_ERR "IMQ: numdevs has to be betweed 1 and %u\n", ++ IMQ_MAX_DEVS); ++ return -EINVAL; ++ } ++ ++ rtnl_lock(); ++ err = __rtnl_link_register(&imq_link_ops); ++ ++ for (i = 0; i < numdevs && !err; i++) ++ err = imq_init_one(i); ++ ++ if (err) { ++ __rtnl_link_unregister(&imq_link_ops); ++ memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); ++ } ++ rtnl_unlock(); ++ ++ return err; ++} ++ ++static int __init imq_init_module(void) ++{ ++ int err; ++ ++#if defined(CONFIG_IMQ_NUM_DEVS) ++ BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS > 16); ++ BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS < 2); ++ BUILD_BUG_ON(CONFIG_IMQ_NUM_DEVS - 1 > IMQ_F_IFMASK); ++#endif ++ ++ err = imq_init_devs(); ++ if (err) { ++ printk(KERN_ERR "IMQ: Error trying imq_init_devs(net)\n"); ++ return err; ++ } ++ ++ err = imq_init_hooks(); ++ if (err) { ++ printk(KERN_ERR "IMQ: Error trying imq_init_hooks()\n"); ++ rtnl_link_unregister(&imq_link_ops); ++ memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); ++ return err; ++ } ++ ++ printk(KERN_INFO "IMQ driver loaded successfully.\n"); ++ ++#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB) ++ printk(KERN_INFO "\tHooking IMQ before NAT on PREROUTING.\n"); ++#else ++ printk(KERN_INFO "\tHooking IMQ after NAT on PREROUTING.\n"); ++#endif ++#if defined(CONFIG_IMQ_BEHAVIOR_AB) || defined(CONFIG_IMQ_BEHAVIOR_BB) ++ printk(KERN_INFO "\tHooking IMQ before NAT on POSTROUTING.\n"); ++#else ++ printk(KERN_INFO "\tHooking IMQ after NAT on POSTROUTING.\n"); ++#endif ++ ++ return 0; ++} ++ ++static void __exit imq_unhook(void) ++{ ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++ nf_unregister_hook(&imq_ingress_ipv6); ++ nf_unregister_hook(&imq_egress_ipv6); ++#endif ++ nf_unregister_hook(&imq_ingress_ipv4); ++ nf_unregister_hook(&imq_egress_ipv4); ++ ++ nf_unregister_queue_imq_handler(); ++} ++ ++static void __exit imq_cleanup_devs(void) ++{ ++ rtnl_link_unregister(&imq_link_ops); ++ memset(imq_devs_cache, 0, sizeof(imq_devs_cache)); ++} ++ ++static void __exit imq_exit_module(void) ++{ ++ imq_unhook(); ++ imq_cleanup_devs(); ++ printk(KERN_INFO "IMQ driver unloaded successfully.\n"); ++} ++ ++module_init(imq_init_module); ++module_exit(imq_exit_module); ++ ++module_param(numdevs, int, 0); ++MODULE_PARM_DESC(numdevs, "number of IMQ devices (how many imq* devices will " ++ "be created)"); ++MODULE_AUTHOR("http://www.linuximq.net"); ++MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See " ++ "http://www.linuximq.net/ for more information."); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS_RTNL_LINK("imq"); ++ +--- a/drivers/net/Kconfig ++++ b/drivers/net/Kconfig +@@ -124,6 +124,129 @@ config EQUALIZER + To compile this driver as a module, choose M here: the module + will be called eql. If unsure, say N. + ++config IMQ ++ tristate "IMQ (intermediate queueing device) support" ++ depends on NETDEVICES && NETFILTER ++ ---help--- ++ The IMQ device(s) is used as placeholder for QoS queueing ++ disciplines. Every packet entering/leaving the IP stack can be ++ directed through the IMQ device where it's enqueued/dequeued to the ++ attached qdisc. This allows you to treat network devices as classes ++ and distribute bandwidth among them. Iptables is used to specify ++ through which IMQ device, if any, packets travel. ++ ++ More information at: http://www.linuximq.net/ ++ ++ To compile this driver as a module, choose M here: the module ++ will be called imq. If unsure, say N. ++ ++choice ++ prompt "IMQ behavior (PRE/POSTROUTING)" ++ depends on IMQ ++ default IMQ_BEHAVIOR_AB ++ help ++ ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ IMQ can work in any of the following ways: ++ ++ PREROUTING | POSTROUTING ++ -----------------|------------------- ++ #1 After NAT | After NAT ++ #2 After NAT | Before NAT ++ #3 Before NAT | After NAT ++ #4 Before NAT | Before NAT ++ ++ The default behavior is to hook before NAT on PREROUTING ++ and after NAT on POSTROUTING (#3). ++ ++ This settings are specially usefull when trying to use IMQ ++ to shape NATed clients. ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++config IMQ_BEHAVIOR_AA ++ bool "IMQ AA" ++ help ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ Choosing this option will make IMQ hook like this: ++ ++ PREROUTING: After NAT ++ POSTROUTING: After NAT ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++config IMQ_BEHAVIOR_AB ++ bool "IMQ AB" ++ help ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ Choosing this option will make IMQ hook like this: ++ ++ PREROUTING: After NAT ++ POSTROUTING: Before NAT ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++config IMQ_BEHAVIOR_BA ++ bool "IMQ BA" ++ help ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ Choosing this option will make IMQ hook like this: ++ ++ PREROUTING: Before NAT ++ POSTROUTING: After NAT ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++config IMQ_BEHAVIOR_BB ++ bool "IMQ BB" ++ help ++ This settings defines how IMQ behaves in respect to its ++ hooking in PREROUTING and POSTROUTING. ++ ++ Choosing this option will make IMQ hook like this: ++ ++ PREROUTING: Before NAT ++ POSTROUTING: Before NAT ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ ++endchoice ++ ++config IMQ_NUM_DEVS ++ ++ int "Number of IMQ devices" ++ range 2 16 ++ depends on IMQ ++ default "16" ++ help ++ ++ This settings defines how many IMQ devices will be ++ created. ++ ++ The default value is 16. ++ ++ More information can be found at: www.linuximq.net ++ ++ If not sure leave the default settings alone. ++ + config TUN + tristate "Universal TUN/TAP device driver support" + select CRC32 +--- a/drivers/net/Makefile ++++ b/drivers/net/Makefile +@@ -173,6 +173,7 @@ obj-$(CONFIG_SLHC) += slhc.o + obj-$(CONFIG_XEN_NETDEV_FRONTEND) += xen-netfront.o + + obj-$(CONFIG_DUMMY) += dummy.o ++obj-$(CONFIG_IMQ) += imq.o + obj-$(CONFIG_IFB) += ifb.o + obj-$(CONFIG_MACVLAN) += macvlan.o + obj-$(CONFIG_MACVTAP) += macvtap.o +--- /dev/null ++++ b/include/linux/imq.h +@@ -0,0 +1,13 @@ ++#ifndef _IMQ_H ++#define _IMQ_H ++ ++/* IFMASK (16 device indexes, 0 to 15) and flag(s) fit in 5 bits */ ++#define IMQ_F_BITS 5 ++ ++#define IMQ_F_IFMASK 0x0f ++#define IMQ_F_ENQUEUE 0x10 ++ ++#define IMQ_MAX_DEVS (IMQ_F_IFMASK + 1) ++ ++#endif /* _IMQ_H */ ++ +--- a/include/linux/netdevice.h ++++ b/include/linux/netdevice.h +@@ -1323,6 +1323,7 @@ extern int dev_alloc_name(struct net_de + extern int dev_open(struct net_device *dev); + extern int dev_close(struct net_device *dev); + extern void dev_disable_lro(struct net_device *dev); ++extern struct netdev_queue *dev_pick_tx(struct net_device *dev, struct sk_buff *skb); + extern int dev_queue_xmit(struct sk_buff *skb); + extern int register_netdevice(struct net_device *dev); + extern void unregister_netdevice_queue(struct net_device *dev, +--- /dev/null ++++ b/include/linux/netfilter/xt_IMQ.h +@@ -0,0 +1,9 @@ ++#ifndef _XT_IMQ_H ++#define _XT_IMQ_H ++ ++struct xt_imq_info { ++ unsigned int todev; /* target imq device */ ++}; ++ ++#endif /* _XT_IMQ_H */ ++ +--- /dev/null ++++ b/include/linux/netfilter_ipv4/ipt_IMQ.h +@@ -0,0 +1,10 @@ ++#ifndef _IPT_IMQ_H ++#define _IPT_IMQ_H ++ ++/* Backwards compatibility for old userspace */ ++#include <linux/netfilter/xt_IMQ.h> ++ ++#define ipt_imq_info xt_imq_info ++ ++#endif /* _IPT_IMQ_H */ ++ +--- /dev/null ++++ b/include/linux/netfilter_ipv6/ip6t_IMQ.h +@@ -0,0 +1,10 @@ ++#ifndef _IP6T_IMQ_H ++#define _IP6T_IMQ_H ++ ++/* Backwards compatibility for old userspace */ ++#include <linux/netfilter/xt_IMQ.h> ++ ++#define ip6t_imq_info xt_imq_info ++ ++#endif /* _IP6T_IMQ_H */ ++ +--- a/include/linux/skbuff.h ++++ b/include/linux/skbuff.h +@@ -29,6 +29,9 @@ + #include <linux/rcupdate.h> + #include <linux/dmaengine.h> + #include <linux/hrtimer.h> ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++#include <linux/imq.h> ++#endif + + /* Don't change this without changing skb_csum_unnecessary! */ + #define CHECKSUM_NONE 0 +@@ -328,6 +331,9 @@ struct sk_buff { + * first. This is owned by whoever has the skb queued ATM. + */ + char cb[48] __aligned(8); ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ void *cb_next; ++#endif + + unsigned long _skb_refdst; + #ifdef CONFIG_XFRM +@@ -364,6 +370,9 @@ struct sk_buff { + struct nf_conntrack *nfct; + struct sk_buff *nfct_reasm; + #endif ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ struct nf_queue_entry *nf_queue_entry; ++#endif + #ifdef CONFIG_BRIDGE_NETFILTER + struct nf_bridge_info *nf_bridge; + #endif +@@ -390,6 +399,10 @@ struct sk_buff { + + /* 0/14 bit hole */ + ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ __u8 imq_flags:IMQ_F_BITS; ++#endif ++ + #ifdef CONFIG_NET_DMA + dma_cookie_t dma_cookie; + #endif +@@ -476,6 +489,12 @@ static inline struct rtable *skb_rtable( + return (struct rtable *)skb_dst(skb); + } + ++ ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++extern int skb_save_cb(struct sk_buff *skb); ++extern int skb_restore_cb(struct sk_buff *skb); ++#endif ++ + extern void kfree_skb(struct sk_buff *skb); + extern void consume_skb(struct sk_buff *skb); + extern void __kfree_skb(struct sk_buff *skb); +@@ -2098,6 +2117,10 @@ static inline void __nf_copy(struct sk_b + dst->nfct_reasm = src->nfct_reasm; + nf_conntrack_get_reasm(src->nfct_reasm); + #endif ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ dst->imq_flags = src->imq_flags; ++ dst->nf_queue_entry = src->nf_queue_entry; ++#endif + #ifdef CONFIG_BRIDGE_NETFILTER + dst->nf_bridge = src->nf_bridge; + nf_bridge_get(src->nf_bridge); +--- a/include/net/netfilter/nf_queue.h ++++ b/include/net/netfilter/nf_queue.h +@@ -13,6 +13,12 @@ struct nf_queue_entry { + struct net_device *indev; + struct net_device *outdev; + int (*okfn)(struct sk_buff *); ++ ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ int (*next_outfn)(struct nf_queue_entry *entry, ++ unsigned int queuenum); ++ unsigned int next_queuenum; ++#endif + }; + + #define nf_queue_entry_reroute(x) ((void *)x + sizeof(struct nf_queue_entry)) +@@ -30,5 +36,11 @@ extern int nf_unregister_queue_handler(u + const struct nf_queue_handler *qh); + extern void nf_unregister_queue_handlers(const struct nf_queue_handler *qh); + extern void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict); ++extern void nf_queue_entry_release_refs(struct nf_queue_entry *entry); ++ ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++extern void nf_register_queue_imq_handler(const struct nf_queue_handler *qh); ++extern void nf_unregister_queue_imq_handler(void); ++#endif + + #endif /* _NF_QUEUE_H */ +--- a/net/core/dev.c ++++ b/net/core/dev.c +@@ -98,6 +98,9 @@ + #include <net/net_namespace.h> + #include <net/sock.h> + #include <linux/rtnetlink.h> ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++#include <linux/imq.h> ++#endif + #include <linux/proc_fs.h> + #include <linux/seq_file.h> + #include <linux/stat.h> +@@ -1995,7 +1998,11 @@ int dev_hard_start_xmit(struct sk_buff * + int rc = NETDEV_TX_OK; + + if (likely(!skb->next)) { +- if (!list_empty(&ptype_all)) ++ if (!list_empty(&ptype_all) ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ && !(skb->imq_flags & IMQ_F_ENQUEUE) ++#endif ++ ) + dev_queue_xmit_nit(skb, dev); + + /* +@@ -2119,8 +2126,7 @@ static inline u16 dev_cap_txqueue(struct + return queue_index; + } + +-static struct netdev_queue *dev_pick_tx(struct net_device *dev, +- struct sk_buff *skb) ++struct netdev_queue *dev_pick_tx(struct net_device *dev, struct sk_buff *skb) + { + int queue_index; + const struct net_device_ops *ops = dev->netdev_ops; +@@ -2149,6 +2155,7 @@ static struct netdev_queue *dev_pick_tx( + skb_set_queue_mapping(skb, queue_index); + return netdev_get_tx_queue(dev, queue_index); + } ++EXPORT_SYMBOL(dev_pick_tx); + + static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, + struct net_device *dev, +--- a/net/core/skbuff.c ++++ b/net/core/skbuff.c +@@ -72,6 +72,9 @@ + + static struct kmem_cache *skbuff_head_cache __read_mostly; + static struct kmem_cache *skbuff_fclone_cache __read_mostly; ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++static struct kmem_cache *skbuff_cb_store_cache __read_mostly; ++#endif + + static void sock_pipe_buf_release(struct pipe_inode_info *pipe, + struct pipe_buffer *buf) +@@ -91,6 +94,83 @@ static int sock_pipe_buf_steal(struct pi + return 1; + } + ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++/* Control buffer save/restore for IMQ devices */ ++struct skb_cb_table { ++ void *cb_next; ++ atomic_t refcnt; ++ char cb[48]; ++}; ++ ++static DEFINE_SPINLOCK(skb_cb_store_lock); ++ ++int skb_save_cb(struct sk_buff *skb) ++{ ++ struct skb_cb_table *next; ++ ++ next = kmem_cache_alloc(skbuff_cb_store_cache, GFP_ATOMIC); ++ if (!next) ++ return -ENOMEM; ++ ++ BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb)); ++ ++ memcpy(next->cb, skb->cb, sizeof(skb->cb)); ++ next->cb_next = skb->cb_next; ++ ++ atomic_set(&next->refcnt, 1); ++ ++ skb->cb_next = next; ++ return 0; ++} ++EXPORT_SYMBOL(skb_save_cb); ++ ++int skb_restore_cb(struct sk_buff *skb) ++{ ++ struct skb_cb_table *next; ++ ++ if (!skb->cb_next) ++ return 0; ++ ++ next = skb->cb_next; ++ ++ BUILD_BUG_ON(sizeof(skb->cb) != sizeof(next->cb)); ++ ++ memcpy(skb->cb, next->cb, sizeof(skb->cb)); ++ skb->cb_next = next->cb_next; ++ ++ spin_lock(&skb_cb_store_lock); ++ ++ if (atomic_dec_and_test(&next->refcnt)) { ++ kmem_cache_free(skbuff_cb_store_cache, next); ++ } ++ ++ spin_unlock(&skb_cb_store_lock); ++ ++ return 0; ++} ++EXPORT_SYMBOL(skb_restore_cb); ++ ++static void skb_copy_stored_cb(struct sk_buff *new, const struct sk_buff *__old) ++{ ++ struct skb_cb_table *next; ++ struct sk_buff *old; ++ ++ if (!__old->cb_next) { ++ new->cb_next = NULL; ++ return; ++ } ++ ++ spin_lock(&skb_cb_store_lock); ++ ++ old = (struct sk_buff *)__old; ++ ++ next = old->cb_next; ++ atomic_inc(&next->refcnt); ++ new->cb_next = next; ++ ++ spin_unlock(&skb_cb_store_lock); ++} ++#endif + + /* Pipe buffer operations for a socket. */ + static const struct pipe_buf_operations sock_pipe_buf_ops = { +@@ -378,6 +458,26 @@ static void skb_release_head_state(struc + WARN_ON(in_irq()); + skb->destructor(skb); + } ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ /* This should not happen. When it does, avoid memleak by restoring ++ the chain of cb-backups. */ ++ while(skb->cb_next != NULL) { ++ if (net_ratelimit()) ++ printk(KERN_WARNING "IMQ: kfree_skb: skb->cb_next: " ++ "%08x\n", (unsigned int)skb->cb_next); ++ ++ skb_restore_cb(skb); ++ } ++ /* This should not happen either, nf_queue_entry is nullified in ++ * imq_dev_xmit(). If we have non-NULL nf_queue_entry then we are ++ * leaking entry pointers, maybe memory. We don't know if this is ++ * pointer to already freed memory, or should this be freed. ++ * If this happens we need to add refcounting, etc for nf_queue_entry. ++ */ ++ if (skb->nf_queue_entry && net_ratelimit()) ++ printk(KERN_WARNING ++ "IMQ: kfree_skb: skb->nf_queue_entry != NULL"); ++#endif + #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) + nf_conntrack_put(skb->nfct); + nf_conntrack_put_reasm(skb->nfct_reasm); +@@ -514,6 +614,9 @@ static void __copy_skb_header(struct sk_ + new->sp = secpath_get(old->sp); + #endif + memcpy(new->cb, old->cb, sizeof(old->cb)); ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ skb_copy_stored_cb(new, old); ++#endif + new->csum = old->csum; + new->local_df = old->local_df; + new->pkt_type = old->pkt_type; +@@ -2765,6 +2868,13 @@ void __init skb_init(void) + 0, + SLAB_HWCACHE_ALIGN|SLAB_PANIC, + NULL); ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ skbuff_cb_store_cache = kmem_cache_create("skbuff_cb_store_cache", ++ sizeof(struct skb_cb_table), ++ 0, ++ SLAB_HWCACHE_ALIGN|SLAB_PANIC, ++ NULL); ++#endif + } + + /** +--- a/net/netfilter/Kconfig ++++ b/net/netfilter/Kconfig +@@ -455,6 +455,18 @@ config NETFILTER_XT_TARGET_LED + For more information on the LEDs available on your system, see + Documentation/leds-class.txt + ++config NETFILTER_XT_TARGET_IMQ ++ tristate '"IMQ" target support' ++ depends on NETFILTER_XTABLES ++ depends on IP_NF_MANGLE || IP6_NF_MANGLE ++ select IMQ ++ default m if NETFILTER_ADVANCED=n ++ help ++ This option adds a `IMQ' target which is used to specify if and ++ to which imq device packets should get enqueued/dequeued. ++ ++ To compile it as a module, choose M here. If unsure, say N. ++ + config NETFILTER_XT_TARGET_MARK + tristate '"MARK" target support' + depends on NETFILTER_ADVANCED +--- a/net/netfilter/Makefile ++++ b/net/netfilter/Makefile +@@ -51,6 +51,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSEC + obj-$(CONFIG_NETFILTER_XT_TARGET_CT) += xt_CT.o + obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o + obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o ++obj-$(CONFIG_NETFILTER_XT_TARGET_IMQ) += xt_IMQ.o + obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o + obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o + obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o +--- a/net/netfilter/nf_queue.c ++++ b/net/netfilter/nf_queue.c +@@ -22,6 +22,26 @@ static const struct nf_queue_handler __r + + static DEFINE_MUTEX(queue_handler_mutex); + ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++static const struct nf_queue_handler *queue_imq_handler; ++ ++void nf_register_queue_imq_handler(const struct nf_queue_handler *qh) ++{ ++ mutex_lock(&queue_handler_mutex); ++ rcu_assign_pointer(queue_imq_handler, qh); ++ mutex_unlock(&queue_handler_mutex); ++} ++EXPORT_SYMBOL(nf_register_queue_imq_handler); ++ ++void nf_unregister_queue_imq_handler(void) ++{ ++ mutex_lock(&queue_handler_mutex); ++ rcu_assign_pointer(queue_imq_handler, NULL); ++ mutex_unlock(&queue_handler_mutex); ++} ++EXPORT_SYMBOL(nf_unregister_queue_imq_handler); ++#endif ++ + /* return EBUSY when somebody else is registered, return EEXIST if the + * same handler is registered, return 0 in case of success. */ + int nf_register_queue_handler(u_int8_t pf, const struct nf_queue_handler *qh) +@@ -82,7 +102,7 @@ void nf_unregister_queue_handlers(const + } + EXPORT_SYMBOL_GPL(nf_unregister_queue_handlers); + +-static void nf_queue_entry_release_refs(struct nf_queue_entry *entry) ++void nf_queue_entry_release_refs(struct nf_queue_entry *entry) + { + /* Release those devices we held, or Alexey will kill me. */ + if (entry->indev) +@@ -102,6 +122,7 @@ static void nf_queue_entry_release_refs( + /* Drop reference to owner of hook which queued us. */ + module_put(entry->elem->owner); + } ++EXPORT_SYMBOL_GPL(nf_queue_entry_release_refs); + + /* + * Any packet that leaves via this function must come back +@@ -123,12 +144,26 @@ static int __nf_queue(struct sk_buff *sk + #endif + const struct nf_afinfo *afinfo; + const struct nf_queue_handler *qh; ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ const struct nf_queue_handler *qih = NULL; ++#endif + + /* QUEUE == DROP if noone is waiting, to be safe. */ + rcu_read_lock(); + + qh = rcu_dereference(queue_handler[pf]); ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) ++ if (pf == PF_INET || pf == PF_INET6) ++#else ++ if (pf == PF_INET) ++#endif ++ qih = rcu_dereference(queue_imq_handler); ++ ++ if (!qh && !qih) ++#else /* !IMQ */ + if (!qh) ++#endif + goto err_unlock; + + afinfo = nf_get_afinfo(pf); +@@ -147,6 +182,10 @@ static int __nf_queue(struct sk_buff *sk + .indev = indev, + .outdev = outdev, + .okfn = okfn, ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ .next_outfn = qh ? qh->outfn : NULL, ++ .next_queuenum = queuenum, ++#endif + }; + + /* If it's going away, ignore hook. */ +@@ -173,8 +212,19 @@ static int __nf_queue(struct sk_buff *sk + #endif + skb_dst_force(skb); + afinfo->saveroute(skb, entry); ++ ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++ if (qih) { ++ status = qih->outfn(entry, queuenum); ++ goto imq_skip_queue; ++ } ++#endif ++ + status = qh->outfn(entry, queuenum); + ++#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) ++imq_skip_queue: ++#endif + rcu_read_unlock(); + + if (status < 0) { +--- /dev/null ++++ b/net/netfilter/xt_IMQ.c +@@ -0,0 +1,73 @@ ++/* ++ * This target marks packets to be enqueued to an imq device ++ */ ++#include <linux/module.h> ++#include <linux/skbuff.h> ++#include <linux/netfilter/x_tables.h> ++#include <linux/netfilter/xt_IMQ.h> ++#include <linux/imq.h> ++ ++static unsigned int imq_target(struct sk_buff *pskb, ++ const struct xt_action_param *par) ++{ ++ const struct xt_imq_info *mr = par->targinfo; ++ ++ pskb->imq_flags = (mr->todev & IMQ_F_IFMASK) | IMQ_F_ENQUEUE; ++ ++ return XT_CONTINUE; ++} ++ ++static int imq_checkentry(const struct xt_tgchk_param *par) ++{ ++ struct xt_imq_info *mr = par->targinfo; ++ ++ if (mr->todev > IMQ_MAX_DEVS - 1) { ++ printk(KERN_WARNING ++ "IMQ: invalid device specified, highest is %u\n", ++ IMQ_MAX_DEVS - 1); ++ return -EINVAL; ++ } ++ ++ return 0; ++} ++ ++static struct xt_target xt_imq_reg[] __read_mostly = { ++ { ++ .name = "IMQ", ++ .family = AF_INET, ++ .checkentry = imq_checkentry, ++ .target = imq_target, ++ .targetsize = sizeof(struct xt_imq_info), ++ .table = "mangle", ++ .me = THIS_MODULE ++ }, ++ { ++ .name = "IMQ", ++ .family = AF_INET6, ++ .checkentry = imq_checkentry, ++ .target = imq_target, ++ .targetsize = sizeof(struct xt_imq_info), ++ .table = "mangle", ++ .me = THIS_MODULE ++ }, ++}; ++ ++static int __init imq_init(void) ++{ ++ return xt_register_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg)); ++} ++ ++static void __exit imq_fini(void) ++{ ++ xt_unregister_targets(xt_imq_reg, ARRAY_SIZE(xt_imq_reg)); ++} ++ ++module_init(imq_init); ++module_exit(imq_fini); ++ ++MODULE_AUTHOR("http://www.linuximq.net"); ++MODULE_DESCRIPTION("Pseudo-driver for the intermediate queue device. See http://www.linuximq.net/ for more information."); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS("ipt_IMQ"); ++MODULE_ALIAS("ip6t_IMQ"); ++ |