diff -uNr linux-2.6.34/drivers/net/imq.c linux-2.6.34-imq/drivers/net/imq.c --- linux-2.6.34/drivers/net/imq.c 1970-01-01 02:00:00.000000000 +0200 +++ linux-2.6.34-imq/drivers/net/imq.c 2010-06-02 10:05:45.752109073 +0300 @@ -0,0 +1,635 @@ +/* + * 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, + * + * The first version was written by Martin Devera, + * + * Credits: Jan Rafaj + * - Update patch to 2.4.21 + * Sebastian Strollo + * - Fix "Dead-loop on netdevice imq"-issue + * Marcel Sebek + * - 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 + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + #include +#endif +#include +#include +#include + +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"); + diff -uNr linux-2.6.34/drivers/net/Kconfig linux-2.6.34-imq/drivers/net/Kconfig --- linux-2.6.34/drivers/net/Kconfig 2010-05-17 00:17:36.000000000 +0300 +++ linux-2.6.34-imq/drivers/net/Kconfig 2010-06-02 10:05:45.752109073 +0300 @@ -121,6 +121,129 @@ 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 diff -uNr linux-2.6.34/drivers/net/Makefile linux-2.6.34-imq/drivers/net/Makefile --- linux-2.6.34/drivers/net/Makefile 2010-05-17 00:17:36.000000000 +0300 +++ linux-2.6.34-imq/drivers/net/Makefile 2010-06-02 10:05:45.752109073 +0300 @@ -169,6 +169,7 @@ 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 diff -uNr linux-2.6.34/include/linux/imq.h linux-2.6.34-imq/include/linux/imq.h --- linux-2.6.34/include/linux/imq.h 1970-01-01 02:00:00.000000000 +0200 +++ linux-2.6.34-imq/include/linux/imq.h 2010-06-02 10:05:45.752109073 +0300 @@ -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 */ + diff -uNr linux-2.6.34/include/linux/netdevice.h linux-2.6.34-imq/include/linux/netdevice.h --- linux-2.6.34/include/linux/netdevice.h 2010-05-17 00:17:36.000000000 +0300 +++ linux-2.6.34-imq/include/linux/netdevice.h 2010-06-02 10:05:45.752109073 +0300 @@ -1203,6 +1203,7 @@ 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, diff -uNr linux-2.6.34/include/linux/netfilter/xt_IMQ.h linux-2.6.34-imq/include/linux/netfilter/xt_IMQ.h --- linux-2.6.34/include/linux/netfilter/xt_IMQ.h 1970-01-01 02:00:00.000000000 +0200 +++ linux-2.6.34-imq/include/linux/netfilter/xt_IMQ.h 2010-06-02 10:05:45.752109073 +0300 @@ -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 */ + diff -uNr linux-2.6.34/include/linux/netfilter_ipv4/ipt_IMQ.h linux-2.6.34-imq/include/linux/netfilter_ipv4/ipt_IMQ.h --- linux-2.6.34/include/linux/netfilter_ipv4/ipt_IMQ.h 1970-01-01 02:00:00.000000000 +0200 +++ linux-2.6.34-imq/include/linux/netfilter_ipv4/ipt_IMQ.h 2010-06-02 10:05:45.752109073 +0300 @@ -0,0 +1,10 @@ +#ifndef _IPT_IMQ_H +#define _IPT_IMQ_H + +/* Backwards compatibility for old userspace */ +#include + +#define ipt_imq_info xt_imq_info + +#endif /* _IPT_IMQ_H */ + diff -uNr linux-2.6.34/include/linux/netfilter_ipv6/ip6t_IMQ.h linux-2.6.34-imq/include/linux/netfilter_ipv6/ip6t_IMQ.h --- linux-2.6.34/include/linux/netfilter_ipv6/ip6t_IMQ.h 1970-01-01 02:00:00.000000000 +0200 +++ linux-2.6.34-imq/include/linux/netfilter_ipv6/ip6t_IMQ.h 2010-06-02 10:05:45.752109073 +0300 @@ -0,0 +1,10 @@ +#ifndef _IP6T_IMQ_H +#define _IP6T_IMQ_H + +/* Backwards compatibility for old userspace */ +#include + +#define ip6t_imq_info xt_imq_info + +#endif /* _IP6T_IMQ_H */ + diff -uNr linux-2.6.34/include/linux/skbuff.h linux-2.6.34-imq/include/linux/skbuff.h --- linux-2.6.34/include/linux/skbuff.h 2010-05-17 00:17:36.000000000 +0300 +++ linux-2.6.34-imq/include/linux/skbuff.h 2010-06-02 10:05:45.752109073 +0300 @@ -29,6 +29,9 @@ #include #include #include +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) +#include +#endif /* Don't change this without changing skb_csum_unnecessary! */ #define CHECKSUM_NONE 0 @@ -321,6 +324,9 @@ * 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_dst; #ifdef CONFIG_XFRM @@ -357,6 +363,9 @@ 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 @@ -378,6 +387,10 @@ /* 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 @@ -426,6 +439,12 @@ 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); @@ -1970,6 +1989,10 @@ 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); diff -uNr linux-2.6.34/include/net/netfilter/nf_queue.h linux-2.6.34-imq/include/net/netfilter/nf_queue.h --- linux-2.6.34/include/net/netfilter/nf_queue.h 2010-05-17 00:17:36.000000000 +0300 +++ linux-2.6.34-imq/include/net/netfilter/nf_queue.h 2010-06-02 10:05:45.752109073 +0300 @@ -13,6 +13,12 @@ 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 @@ 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 */ diff -uNr linux-2.6.34/net/core/dev.c linux-2.6.34-imq/net/core/dev.c --- linux-2.6.34/net/core/dev.c 2010-05-17 00:17:36.000000000 +0300 +++ linux-2.6.34-imq/net/core/dev.c 2010-06-02 10:05:45.752109073 +0300 @@ -98,6 +98,9 @@ #include #include #include +#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE) +#include +#endif #include #include #include @@ -1859,7 +1862,11 @@ 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); if (netif_needs_gso(dev, skb)) { @@ -1969,8 +1976,7 @@ 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) { u16 queue_index; struct sock *sk = skb->sk; @@ -2000,6 +2006,7 @@ 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, diff -uNr linux-2.6.34/net/core/skbuff.c linux-2.6.34-imq/net/core/skbuff.c --- linux-2.6.34/net/core/skbuff.c 2010-05-17 00:17:36.000000000 +0300 +++ linux-2.6.34-imq/net/core/skbuff.c 2010-06-02 10:05:45.752109073 +0300 @@ -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 @@ 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 = { @@ -398,6 +478,26 @@ 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); @@ -538,6 +638,9 @@ 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 @@ 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 } /** diff -uNr linux-2.6.34/net/netfilter/Kconfig linux-2.6.34-imq/net/netfilter/Kconfig --- linux-2.6.34/net/netfilter/Kconfig 2010-05-17 00:17:36.000000000 +0300 +++ linux-2.6.34-imq/net/netfilter/Kconfig 2010-06-02 10:05:45.762097870 +0300 @@ -421,6 +421,18 @@ 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' default m if NETFILTER_ADVANCED=n diff -uNr linux-2.6.34/net/netfilter/Makefile linux-2.6.34-imq/net/netfilter/Makefile --- linux-2.6.34/net/netfilter/Makefile 2010-05-17 00:17:36.000000000 +0300 +++ linux-2.6.34-imq/net/netfilter/Makefile 2010-06-02 10:05:45.762097870 +0300 @@ -47,6 +47,7 @@ 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_MARK) += xt_MARK.o obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o diff -uNr linux-2.6.34/net/netfilter/nf_queue.c linux-2.6.34-imq/net/netfilter/nf_queue.c --- linux-2.6.34/net/netfilter/nf_queue.c 2010-05-17 00:17:36.000000000 +0300 +++ linux-2.6.34-imq/net/netfilter/nf_queue.c 2010-06-02 10:05:45.762097870 +0300 @@ -21,6 +21,26 @@ 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) @@ -81,7 +101,7 @@ } 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) @@ -101,6 +121,7 @@ /* 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 @@ -122,12 +143,26 @@ #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); @@ -146,6 +181,10 @@ .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. */ @@ -171,8 +210,19 @@ } #endif 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) { diff -uNr linux-2.6.34/net/netfilter/xt_IMQ.c linux-2.6.34-imq/net/netfilter/xt_IMQ.c --- linux-2.6.34/net/netfilter/xt_IMQ.c 1970-01-01 02:00:00.000000000 +0200 +++ linux-2.6.34-imq/net/netfilter/xt_IMQ.c 2010-06-02 10:05:45.762097870 +0300 @@ -0,0 +1,73 @@ +/* + * This target marks packets to be enqueued to an imq device + */ +#include +#include +#include +#include +#include + +static unsigned int imq_target(struct sk_buff *pskb, + const struct xt_target_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 bool 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 0; + } + + return 1; +} + +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"); +