150-netfilter_imq.patch

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Index: linux-2.6.21.7/drivers/net/imq.c
===================================================================
--- /dev/null
+++ linux-2.6.21.7/drivers/net/imq.c
@@ -0,0 +1,402 @@
+/*
+ *             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, <[e-mail]>
+ *
+ *            The first version was written by Martin Devera, <[e-mail]>
+ *
+ * Credits:    Jan Rafaj <[e-mail]>
+ *              - Update patch to 2.4.21
+ *             Sebastian Strollo <[e-mail]>
+ *              - Fix "Dead-loop on netdevice imq"-issue
+ *             Marcel Sebek <[e-mail]>
+ *              - 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.
+ *
+ *             More info at: http://www.linuximq.net/ (Andre Correa)
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/moduleparam.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.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>
+
+extern int qdisc_restart1(struct net_device *dev);
+
+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_IP_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_IP_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_IP6_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_IP6_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 = 2;
+#endif
+
+static struct net_device *imq_devs;
+
+static struct net_device_stats *imq_get_stats(struct net_device *dev)
+{
+	return (struct net_device_stats *)dev->priv;
+}
+
+/* called for packets kfree'd in qdiscs at places other than enqueue */
+static void imq_skb_destructor(struct sk_buff *skb)
+{
+	struct nf_info *info = skb->nf_info;
+
+	if (info) {
+		if (info->indev)
+			dev_put(info->indev);
+		if (info->outdev)
+			dev_put(info->outdev);
+		kfree(info);
+	}
+}
+
+static int imq_dev_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct net_device_stats *stats = (struct net_device_stats*) dev->priv;
+
+	stats->tx_bytes += skb->len;
+	stats->tx_packets++;
+
+	skb->imq_flags = 0;
+	skb->destructor = NULL;
+
+	dev->trans_start = jiffies;
+	nf_reinject(skb, skb->nf_info, NF_ACCEPT);
+	return 0;
+}
+
+static int imq_nf_queue(struct sk_buff *skb, struct nf_info *info, unsigned queue_num, void *data)
+{
+	struct net_device *dev;
+	struct net_device_stats *stats;
+	struct sk_buff *skb2 = NULL;
+	struct Qdisc *q;
+	unsigned int index = skb->imq_flags&IMQ_F_IFMASK;
+	int ret = -1;
+
+	if (index > numdevs)
+		return -1;
+
+	dev = imq_devs + index;
+	if (!(dev->flags & IFF_UP)) {
+		skb->imq_flags = 0;
+		nf_reinject(skb, info, NF_ACCEPT);
+		return 0;
+	}
+	dev->last_rx = jiffies;
+
+	if (skb->destructor) {
+		skb2 = skb;
+		skb = skb_clone(skb, GFP_ATOMIC);
+		if (!skb)
+			return -1;
+	}
+	skb->nf_info = info;
+
+	stats = (struct net_device_stats *)dev->priv;
+	stats->rx_bytes+= skb->len;
+	stats->rx_packets++;
+
+	spin_lock_bh(&dev->queue_lock);
+	q = dev->qdisc;
+	if (q->enqueue) {
+		q->enqueue(skb_get(skb), q);
+		if (skb_shared(skb)) {
+			skb->destructor = imq_skb_destructor;
+			kfree_skb(skb);
+			ret = 0;
+		}
+	}
+	if (spin_is_locked(&dev->_xmit_lock))
+		netif_schedule(dev);
+	else
+		while (!netif_queue_stopped(dev) && qdisc_restart1(dev) < 0)
+			/* NOTHING */;
+
+	spin_unlock_bh(&dev->queue_lock);
+
+	if (skb2)
+		kfree_skb(ret ? skb : skb2);
+
+	return ret;
+}
+
+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 __init imq_init_hooks(void)
+{
+	int err;
+
+	err = nf_register_queue_handler(PF_INET, &nfqh);
+	if (err > 0)
+		goto err1;
+	if ((err = nf_register_hook(&imq_ingress_ipv4)))
+		goto err2;
+	if ((err = nf_register_hook(&imq_egress_ipv4)))
+		goto err3;
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+	if ((err = nf_register_queue_handler(PF_INET6, &nfqh)))
+		goto err4;
+	if ((err = nf_register_hook(&imq_ingress_ipv6)))
+		goto err5;
+	if ((err = nf_register_hook(&imq_egress_ipv6)))
+		goto err6;
+#endif
+
+	return 0;
+
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+err6:
+	nf_unregister_hook(&imq_ingress_ipv6);
+err5:
+	nf_unregister_queue_handler(PF_INET6);
+err4:
+	nf_unregister_hook(&imq_egress_ipv4);
+#endif
+err3:
+	nf_unregister_hook(&imq_ingress_ipv4);
+err2:
+	nf_unregister_queue_handler(PF_INET);
+err1:
+	return err;
+}
+
+static void __exit imq_unhook(void)
+{
+	nf_unregister_hook(&imq_ingress_ipv4);
+	nf_unregister_hook(&imq_egress_ipv4);
+	nf_unregister_queue_handler(PF_INET);
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+	nf_unregister_hook(&imq_ingress_ipv6);
+	nf_unregister_hook(&imq_egress_ipv6);
+	nf_unregister_queue_handler(PF_INET6);
+#endif
+}
+
+static int __init imq_dev_init(struct net_device *dev)
+{
+	dev->hard_start_xmit    = imq_dev_xmit;
+	dev->type               = ARPHRD_VOID;
+	dev->mtu                = 1500;
+	dev->tx_queue_len       = 30;
+	dev->flags              = IFF_NOARP;
+	dev->priv = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL);
+	if (dev->priv == NULL)
+		return -ENOMEM;
+	memset(dev->priv, 0, sizeof(struct net_device_stats));
+	dev->get_stats          = imq_get_stats;
+
+	return 0;
+}
+
+static void imq_dev_uninit(struct net_device *dev)
+{
+	kfree(dev->priv);
+}
+
+static int __init imq_init_devs(void)
+{
+	struct net_device *dev;
+	int i,j;
+	j = numdevs;
+
+	if (!numdevs || numdevs > IMQ_MAX_DEVS) {
+		printk(KERN_ERR "IMQ: numdevs has to be betweed 1 and %u\n",
+		       IMQ_MAX_DEVS);
+		return -EINVAL;
+	}
+
+	imq_devs = kmalloc(sizeof(struct net_device) * numdevs, GFP_KERNEL);
+	if (!imq_devs)
+		return -ENOMEM;
+	memset(imq_devs, 0, sizeof(struct net_device) * numdevs);
+
+	/* we start counting at zero */
+	numdevs--;
+
+	for (i = 0, dev = imq_devs; i <= numdevs; i++, dev++) {
+		SET_MODULE_OWNER(dev);
+		strcpy(dev->name, "imq%d");
+		dev->init   = imq_dev_init;
+		dev->uninit = imq_dev_uninit;
+
+		if (register_netdev(dev) < 0)
+			goto err_register;
+	}
+	printk(KERN_INFO "IMQ starting with %u devices...\n", j);
+	return 0;
+
+err_register:
+	for (; i; i--)
+		unregister_netdev(--dev);
+	kfree(imq_devs);
+	return -EIO;
+}
+
+static void imq_cleanup_devs(void)
+{
+	int i;
+	struct net_device *dev = imq_devs;
+
+	for (i = 0; i <= numdevs; i++)
+		unregister_netdev(dev++);
+
+	kfree(imq_devs);
+}
+
+static int __init imq_init_module(void)
+{
+	int err;
+
+	if ((err = imq_init_devs())) {
+		printk(KERN_ERR "IMQ: Error trying imq_init_devs()\n");
+		return err;
+	}
+	if ((err = imq_init_hooks())) {
+		printk(KERN_ERR "IMQ: Error trying imq_init_hooks()\n");
+		imq_cleanup_devs();
+		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_cleanup_module(void)
+{
+	imq_unhook();
+	imq_cleanup_devs();
+	printk(KERN_INFO "IMQ driver unloaded successfully.\n");
+}
+
+
+module_init(imq_init_module);
+module_exit(imq_cleanup_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");
Index: linux-2.6.21.7/drivers/net/Kconfig
===================================================================
--- linux-2.6.21.7.orig/drivers/net/Kconfig
+++ linux-2.6.21.7/drivers/net/Kconfig
@@ -96,6 +96,129 @@ 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_BA
+	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