asterisk addon: update to 11.13.1

[people/pmueller/ipfire-2.x.git] / src / patches / linux-3.10.30-imq.patch

diff -Naur linux-3.10.30.org/drivers/net/imq.c linux-3.10.30/drivers/net/imq.c
--- linux-3.10.30.org/drivers/net/imq.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-3.10.30/drivers/net/imq.c	2014-02-14 20:29:05.379402305 +0100
@@ -0,0 +1,1001 @@
+/*
+ *             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
+ *
+ *             2010/08/15 - (Jussi Kivilinna)
+ *              - Port to 2.6.35
+ *              - Simplify hook registration by using nf_register_hooks.
+ *              - nf_reinject doesn't need spinlock around it, therefore remove
+ *                imq_nf_reinject function. Other nf_reinject users protect
+ *                their own data with spinlock. With IMQ however all data is
+ *                needed is stored per skbuff, so no locking is needed.
+ *              - Changed IMQ to use 'separate' NF_IMQ_QUEUE instead of
+ *                NF_QUEUE, this allows working coexistance of IMQ and other
+ *                NF_QUEUE users.
+ *              - Make IMQ multi-queue. Number of IMQ device queues can be
+ *                increased with 'numqueues' module parameters. Default number
+ *                of queues is 1, in other words by default IMQ works as
+ *                single-queue device. Multi-queue selection is based on
+ *                IFB multi-queue patch by Changli Gao <xiaosuo@gmail.com>.
+ *
+ *             2011/03/18 - (Jussi Kivilinna)
+ *              - Port to 2.6.38
+ *
+ *             2011/07/12 - (syoder89@gmail.com)
+ *              - Crash fix that happens when the receiving interface has more
+ *                than one queue (add missing skb_set_queue_mapping in
+ *                imq_select_queue).
+ *
+ *             2011/07/26 - (Jussi Kivilinna)
+ *              - Add queue mapping checks for packets exiting IMQ.
+ *              - Port to 3.0
+ *
+ *             2011/08/16 - (Jussi Kivilinna)
+ *              - Clear IFF_TX_SKB_SHARING flag that was added for linux 3.0.2
+ *
+ *             2011/11/03 - Germano Michel <germanomichel@gmail.com>
+ *              - Fix IMQ for net namespaces
+ *
+ *             2011/11/04 - Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
+ *              - Port to 3.1
+ *              - Clean-up, move 'get imq device pointer by imqX name' to
+ *                separate function from imq_nf_queue().
+ *
+ *             2012/01/05 - Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
+ *              - Port to 3.2
+ *
+ *             2012/03/19 - Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
+ *              - Port to 3.3
+ *
+ *             2012/12/12 - Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
+ *              - Port to 3.7
+ *              - Fix checkpatch.pl warnings
+ *
+ *             2013/09/10 - Jussi Kivilinna <jussi.kivilinna@iki.fi>
+ *              - Fixed GSO handling for 3.10, see imq_nf_queue() for comments.
+ *              - Don't copy skb->cb_next when copying or cloning skbuffs.
+ *
+ *	       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>
+#include <net/sock.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/if_vlan.h>
+#include <linux/if_pppox.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+
+static int imq_nf_queue(struct nf_queue_entry *entry, unsigned queue_num);
+
+static nf_hookfn imq_nf_hook;
+
+static struct nf_hook_ops imq_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
+	},
+	{
+	/* 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)
+	{
+	/* 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
+	},
+	{
+	/* 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 int numdevs = CONFIG_IMQ_NUM_DEVS;
+#else
+static int numdevs = IMQ_MAX_DEVS;
+#endif
+
+static struct net_device *imq_devs_cache[IMQ_MAX_DEVS];
+
+#define IMQ_MAX_QUEUES 32
+static int numqueues = 1;
+static u32 imq_hashrnd;
+
+static inline __be16 pppoe_proto(const struct sk_buff *skb)
+{
+	return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN +
+			sizeof(struct pppoe_hdr)));
+}
+
+static u16 imq_hash(struct net_device *dev, struct sk_buff *skb)
+{
+	unsigned int pull_len;
+	u16 protocol = skb->protocol;
+	u32 addr1, addr2;
+	u32 hash, ihl = 0;
+	union {
+		u16 in16[2];
+		u32 in32;
+	} ports;
+	u8 ip_proto;
+
+	pull_len = 0;
+
+recheck:
+	switch (protocol) {
+	case htons(ETH_P_8021Q): {
+		if (unlikely(skb_pull(skb, VLAN_HLEN) == NULL))
+			goto other;
+
+		pull_len += VLAN_HLEN;
+		skb->network_header += VLAN_HLEN;
+
+		protocol = vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
+		goto recheck;
+	}
+
+	case htons(ETH_P_PPP_SES): {
+		if (unlikely(skb_pull(skb, PPPOE_SES_HLEN) == NULL))
+			goto other;
+
+		pull_len += PPPOE_SES_HLEN;
+		skb->network_header += PPPOE_SES_HLEN;
+
+		protocol = pppoe_proto(skb);
+		goto recheck;
+	}
+
+	case htons(ETH_P_IP): {
+		const struct iphdr *iph = ip_hdr(skb);
+
+		if (unlikely(!pskb_may_pull(skb, sizeof(struct iphdr))))
+			goto other;
+
+		addr1 = iph->daddr;
+		addr2 = iph->saddr;
+
+		ip_proto = !(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) ?
+				 iph->protocol : 0;
+		ihl = ip_hdrlen(skb);
+
+		break;
+	}
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	case htons(ETH_P_IPV6): {
+		const struct ipv6hdr *iph = ipv6_hdr(skb);
+		__be16 fo = 0;
+
+		if (unlikely(!pskb_may_pull(skb, sizeof(struct ipv6hdr))))
+			goto other;
+
+		addr1 = iph->daddr.s6_addr32[3];
+		addr2 = iph->saddr.s6_addr32[3];
+		ihl = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &ip_proto,
+				       &fo);
+		if (unlikely(ihl < 0))
+			goto other;
+
+		break;
+	}
+#endif
+	default:
+other:
+		if (pull_len != 0) {
+			skb_push(skb, pull_len);
+			skb->network_header -= pull_len;
+		}
+
+		return (u16)(ntohs(protocol) % dev->real_num_tx_queues);
+	}
+
+	if (addr1 > addr2)
+		swap(addr1, addr2);
+
+	switch (ip_proto) {
+	case IPPROTO_TCP:
+	case IPPROTO_UDP:
+	case IPPROTO_DCCP:
+	case IPPROTO_ESP:
+	case IPPROTO_AH:
+	case IPPROTO_SCTP:
+	case IPPROTO_UDPLITE: {
+		if (likely(skb_copy_bits(skb, ihl, &ports.in32, 4) >= 0)) {
+			if (ports.in16[0] > ports.in16[1])
+				swap(ports.in16[0], ports.in16[1]);
+			break;
+		}
+		/* fall-through */
+	}
+	default:
+		ports.in32 = 0;
+		break;
+	}
+
+	if (pull_len != 0) {
+		skb_push(skb, pull_len);
+		skb->network_header -= pull_len;
+	}
+
+	hash = jhash_3words(addr1, addr2, ports.in32, imq_hashrnd ^ ip_proto);
+
+	return (u16)(((u64)hash * dev->real_num_tx_queues) >> 32);
+}
+
+static inline bool sk_tx_queue_recorded(struct sock *sk)
+{
+	return (sk_tx_queue_get(sk) >= 0);
+}
+
+static struct netdev_queue *imq_select_queue(struct net_device *dev,
+						struct sk_buff *skb)
+{
+	u16 queue_index = 0;
+	u32 hash;
+
+	if (likely(dev->real_num_tx_queues == 1))
+		goto out;
+
+	/* IMQ can be receiving ingress or engress packets. */
+
+	/* Check first for if rx_queue is set */
+	if (skb_rx_queue_recorded(skb)) {
+		queue_index = skb_get_rx_queue(skb);
+		goto out;
+	}
+
+	/* Check if socket has tx_queue set */
+	if (sk_tx_queue_recorded(skb->sk)) {
+		queue_index = sk_tx_queue_get(skb->sk);
+		goto out;
+	}
+
+	/* Try use socket hash */
+	if (skb->sk && skb->sk->sk_hash) {
+		hash = skb->sk->sk_hash;
+		queue_index =
+			(u16)(((u64)hash * dev->real_num_tx_queues) >> 32);
+		goto out;
+	}
+
+	/* Generate hash from packet data */
+	queue_index = imq_hash(dev, skb);
+
+out:
+	if (unlikely(queue_index >= dev->real_num_tx_queues))
+		queue_index = (u16)((u32)queue_index % dev->real_num_tx_queues);
+
+	skb_set_queue_mapping(skb, queue_index);
+	return netdev_get_tx_queue(dev, queue_index);
+}
+
+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 */
+}
+
+static void imq_done_check_queue_mapping(struct sk_buff *skb,
+					 struct net_device *dev)
+{
+	unsigned int queue_index;
+
+	/* Don't let queue_mapping be left too large after exiting IMQ */
+	if (likely(skb->dev != dev && skb->dev != NULL)) {
+		queue_index = skb_get_queue_mapping(skb);
+		if (unlikely(queue_index >= skb->dev->real_num_tx_queues)) {
+			queue_index = (u16)((u32)queue_index %
+						skb->dev->real_num_tx_queues);
+			skb_set_queue_mapping(skb, queue_index);
+		}
+	} else {
+		/* skb->dev was IMQ device itself or NULL, be on safe side and
+		 * just clear queue mapping.
+		 */
+		skb_set_queue_mapping(skb, 0);
+	}
+}
+
+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 (unlikely(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_done_check_queue_mapping(skb, dev);
+
+	nf_reinject(entry, NF_ACCEPT);
+
+	return NETDEV_TX_OK;
+}
+
+static struct net_device *get_imq_device_by_index(int index)
+{
+	struct net_device *dev = NULL;
+	struct net *net;
+	char buf[8];
+
+	/* get device by name and cache result */
+	snprintf(buf, sizeof(buf), "imq%d", index);
+
+	/* Search device from all namespaces. */
+	for_each_net(net) {
+		dev = dev_get_by_name(net, buf);
+		if (dev)
+			break;
+	}
+
+	if (WARN_ON_ONCE(dev == NULL)) {
+		/* IMQ device not found. Exotic config? */
+		return ERR_PTR(-ENODEV);
+	}
+
+	imq_devs_cache[index] = dev;
+	dev_put(dev);
+
+	return dev;
+}
+
+static struct nf_queue_entry *nf_queue_entry_dup(struct nf_queue_entry *e)
+{
+	struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
+	if (entry) {
+		if (nf_queue_entry_get_refs(entry))
+			return entry;
+		kfree(entry);
+	}
+	return NULL;
+}
+
+#ifdef CONFIG_BRIDGE_NETFILTER
+/* When called from bridge netfilter, skb->data must point to MAC header
+ * before calling skb_gso_segment(). Else, original MAC header is lost
+ * and segmented skbs will be sent to wrong destination.
+ */
+static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
+{
+	if (skb->nf_bridge)
+		__skb_push(skb, skb->network_header - skb->mac_header);
+}
+
+static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
+{
+	if (skb->nf_bridge)
+		__skb_pull(skb, skb->network_header - skb->mac_header);
+}
+#else
+#define nf_bridge_adjust_skb_data(s) do {} while (0)
+#define nf_bridge_adjust_segmented_data(s) do {} while (0)
+#endif
+
+static void free_entry(struct nf_queue_entry *entry)
+{
+	nf_queue_entry_release_refs(entry);
+	kfree(entry);
+}
+
+static int __imq_nf_queue(struct nf_queue_entry *entry, struct net_device *dev);
+
+static int __imq_nf_queue_gso(struct nf_queue_entry *entry,
+			      struct net_device *dev, struct sk_buff *skb)
+{
+	int ret = -ENOMEM;
+	struct nf_queue_entry *entry_seg;
+
+	nf_bridge_adjust_segmented_data(skb);
+
+	if (skb->next == NULL) { /* last packet, no need to copy entry */
+		struct sk_buff *gso_skb = entry->skb;
+		entry->skb = skb;
+		ret = __imq_nf_queue(entry, dev);
+		if (ret)
+			entry->skb = gso_skb;
+		return ret;
+	}
+
+	skb->next = NULL;
+
+	entry_seg = nf_queue_entry_dup(entry);
+	if (entry_seg) {
+		entry_seg->skb = skb;
+		ret = __imq_nf_queue(entry_seg, dev);
+		if (ret)
+			free_entry(entry_seg);
+	}
+	return ret;
+}
+
+static int imq_nf_queue(struct nf_queue_entry *entry, unsigned queue_num)
+{
+	struct sk_buff *skb, *segs;
+	struct net_device *dev;
+	unsigned int queued;
+	int index, retval, err;
+
+	index = entry->skb->imq_flags & IMQ_F_IFMASK;
+	if (unlikely(index > numdevs - 1)) {
+		if (net_ratelimit())
+			pr_warn("IMQ: invalid device specified, highest is %u\n",
+				numdevs - 1);
+		retval = -EINVAL;
+		goto out_no_dev;
+	}
+
+	/* check for imq device by index from cache */
+	dev = imq_devs_cache[index];
+	if (unlikely(!dev)) {
+		dev = get_imq_device_by_index(index);
+		if (IS_ERR(dev)) {
+			retval = PTR_ERR(dev);
+			goto out_no_dev;
+		}
+	}
+
+	if (unlikely(!(dev->flags & IFF_UP))) {
+		entry->skb->imq_flags = 0;
+		retval = -ECANCELED;
+		goto out_no_dev;
+	}
+
+	if (!skb_is_gso(entry->skb))
+		return __imq_nf_queue(entry, dev);
+
+	/* Since 3.10.x, GSO handling moved here as result of upstream commit
+	 * a5fedd43d5f6c94c71053a66e4c3d2e35f1731a2 (netfilter: move
+	 * skb_gso_segment into nfnetlink_queue module).
+	 *
+	 * Following code replicates the gso handling from
+	 * 'net/netfilter/nfnetlink_queue_core.c':nfqnl_enqueue_packet().
+	 */
+
+	skb = entry->skb;
+
+	switch (entry->pf) {
+	case NFPROTO_IPV4:
+		skb->protocol = htons(ETH_P_IP);
+		break;
+	case NFPROTO_IPV6:
+		skb->protocol = htons(ETH_P_IPV6);
+		break;
+	}
+
+	nf_bridge_adjust_skb_data(skb);
+	segs = skb_gso_segment(skb, 0);
+	/* Does not use PTR_ERR to limit the number of error codes that can be
+	 * returned by nf_queue.  For instance, callers rely on -ECANCELED to
+	 * mean 'ignore this hook'.
+	 */
+	err = -ENOBUFS;
+	if (IS_ERR(segs))
+		goto out_err;
+	queued = 0;
+	err = 0;
+	do {
+		struct sk_buff *nskb = segs->next;
+		if (nskb && nskb->next)
+			nskb->cb_next = NULL;
+		if (err == 0)
+			err = __imq_nf_queue_gso(entry, dev, segs);
+		if (err == 0)
+			queued++;
+		else
+			kfree_skb(segs);
+		segs = nskb;
+	} while (segs);
+
+	if (queued) {
+		if (err) /* some segments are already queued */
+			free_entry(entry);
+		kfree_skb(skb);
+		return 0;
+	}
+
+out_err:
+	nf_bridge_adjust_segmented_data(skb);
+	retval = err;
+out_no_dev:
+	return retval;
+}
+
+static int __imq_nf_queue(struct nf_queue_entry *entry, struct net_device *dev)
+{
+	struct sk_buff *skb_orig, *skb, *skb_shared;
+	struct Qdisc *q;
+	struct netdev_queue *txq;
+	spinlock_t *root_lock;
+	int users;
+	int retval = -EINVAL;
+	unsigned int orig_queue_index;
+
+	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 (unlikely(!skb)) {
+			retval = -ENOMEM;
+			goto out;
+		}
+		skb->cb_next = NULL;
+		entry->skb = skb;
+	}
+
+	skb->nf_queue_entry = entry;
+
+	dev->stats.rx_bytes += skb->len;
+	dev->stats.rx_packets++;
+
+	if (!skb->dev) {
+		/* skb->dev == NULL causes problems, try the find cause. */
+		if (net_ratelimit()) {
+			dev_warn(&dev->dev,
+				 "received packet with skb->dev == NULL\n");
+			dump_stack();
+		}
+
+		skb->dev = dev;
+	}
+
+	/* Disables softirqs for lock below */
+	rcu_read_lock_bh();
+
+	/* Multi-queue selection */
+	orig_queue_index = skb_get_queue_mapping(skb);
+	txq = imq_select_queue(dev, skb);
+
+	q = rcu_dereference(txq->qdisc);
+	if (unlikely(!q->enqueue))
+		goto packet_not_eaten_by_imq_dev;
+
+	root_lock = qdisc_lock(q);
+	spin_lock(root_lock);
+
+	users = atomic_read(&skb->users);
+
+	skb_shared = skb_get(skb); /* increase reference count by one */
+
+	/* backup skb->cb, as qdisc layer will overwrite it */
+	skb_save_cb(skb_shared);
+	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 (unlikely(skb_orig))
+			kfree_skb(skb_orig); /* free original */
+
+		spin_unlock(root_lock);
+		rcu_read_unlock_bh();
+
+		/* 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(root_lock);
+		goto packet_not_eaten_by_imq_dev;
+	}
+
+packet_not_eaten_by_imq_dev:
+	skb_set_queue_mapping(skb, orig_queue_index);
+	rcu_read_unlock_bh();
+
+	/* cloned? restore original */
+	if (unlikely(skb_orig)) {
+		kfree_skb(skb);
+		entry->skb = skb_orig;
+	}
+	retval = -1;
+out:
+	return retval;
+}
+
+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 *))
+{
+	return (pskb->imq_flags & IMQ_F_ENQUEUE) ? NF_IMQ_QUEUE : 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; /* too small? */
+	dev->tx_queue_len	= 11000; /* too big? */
+	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 |
+				     IFF_TX_SKB_SHARING);
+}
+
+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:
+	pr_warn("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 const struct nf_queue_handler imq_nfqh = {
+	.outfn = imq_nf_queue,
+};
+
+static int __init imq_init_hooks(void)
+{
+	int ret;
+
+	nf_register_queue_imq_handler(&imq_nfqh);
+
+	ret = nf_register_hooks(imq_ops, ARRAY_SIZE(imq_ops));
+	if (ret < 0)
+		nf_unregister_queue_imq_handler();
+
+	return ret;
+}
+
+static int __init imq_init_one(int index)
+{
+	struct net_device *dev;
+	int ret;
+
+	dev = alloc_netdev_mq(0, "imq%d", imq_setup, numqueues);
+	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) {
+		pr_err("IMQ: numdevs has to be betweed 1 and %u\n",
+		       IMQ_MAX_DEVS);
+		return -EINVAL;
+	}
+
+	if (numqueues < 1 || numqueues > IMQ_MAX_QUEUES) {
+		pr_err("IMQ: numqueues has to be betweed 1 and %u\n",
+		       IMQ_MAX_QUEUES);
+		return -EINVAL;
+	}
+
+	get_random_bytes(&imq_hashrnd, sizeof(imq_hashrnd));
+
+	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) {
+		pr_err("IMQ: Error trying imq_init_devs(net)\n");
+		return err;
+	}
+
+	err = imq_init_hooks();
+	if (err) {
+		pr_err(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;
+	}
+
+	pr_info("IMQ driver loaded successfully. (numdevs = %d, numqueues = %d)\n",
+		numdevs, numqueues);
+
+#if defined(CONFIG_IMQ_BEHAVIOR_BA) || defined(CONFIG_IMQ_BEHAVIOR_BB)
+	pr_info("\tHooking IMQ before NAT on PREROUTING.\n");
+#else
+	pr_info("\tHooking IMQ after NAT on PREROUTING.\n");
+#endif
+#if defined(CONFIG_IMQ_BEHAVIOR_AB) || defined(CONFIG_IMQ_BEHAVIOR_BB)
+	pr_info("\tHooking IMQ before NAT on POSTROUTING.\n");
+#else
+	pr_info("\tHooking IMQ after NAT on POSTROUTING.\n");
+#endif
+
+	return 0;
+}
+
+static void __exit imq_unhook(void)
+{
+	nf_unregister_hooks(imq_ops, ARRAY_SIZE(imq_ops));
+	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();
+	pr_info("IMQ driver unloaded successfully.\n");
+}
+
+module_init(imq_init_module);
+module_exit(imq_exit_module);
+
+module_param(numdevs, int, 0);
+module_param(numqueues, int, 0);
+MODULE_PARM_DESC(numdevs, "number of IMQ devices (how many imq* devices will be created)");
+MODULE_PARM_DESC(numqueues, "number of queues per IMQ device");
+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 -Naur linux-3.10.30.org/drivers/net/Kconfig linux-3.10.30/drivers/net/Kconfig
--- linux-3.10.30.org/drivers/net/Kconfig	2014-02-13 22:48:15.000000000 +0100
+++ linux-3.10.30/drivers/net/Kconfig	2014-02-14 20:29:05.379402305 +0100
@@ -207,6 +207,125 @@
 	depends on RIONET
 	default "128"
 
+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 setting 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 setting 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 setting 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 setting 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 setting 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 setting 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 -Naur linux-3.10.30.org/drivers/net/Makefile linux-3.10.30/drivers/net/Makefile
--- linux-3.10.30.org/drivers/net/Makefile	2014-02-13 22:48:15.000000000 +0100
+++ linux-3.10.30/drivers/net/Makefile	2014-02-14 20:29:05.379402305 +0100
@@ -9,6 +9,7 @@
 obj-$(CONFIG_DUMMY) += dummy.o
 obj-$(CONFIG_EQUALIZER) += eql.o
 obj-$(CONFIG_IFB) += ifb.o
+obj-$(CONFIG_IMQ) += imq.o
 obj-$(CONFIG_MACVLAN) += macvlan.o
 obj-$(CONFIG_MACVTAP) += macvtap.o
 obj-$(CONFIG_MII) += mii.o
diff -Naur linux-3.10.30.org/include/linux/imq.h linux-3.10.30/include/linux/imq.h
--- linux-3.10.30.org/include/linux/imq.h	1970-01-01 01:00:00.000000000 +0100
+++ linux-3.10.30/include/linux/imq.h	2014-02-14 20:29:05.379402305 +0100
@@ -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 -Naur linux-3.10.30.org/include/linux/netfilter/xt_IMQ.h linux-3.10.30/include/linux/netfilter/xt_IMQ.h
--- linux-3.10.30.org/include/linux/netfilter/xt_IMQ.h	1970-01-01 01:00:00.000000000 +0100
+++ linux-3.10.30/include/linux/netfilter/xt_IMQ.h	2014-02-14 20:29:05.379402305 +0100
@@ -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 -Naur linux-3.10.30.org/include/linux/netfilter_ipv4/ipt_IMQ.h linux-3.10.30/include/linux/netfilter_ipv4/ipt_IMQ.h
--- linux-3.10.30.org/include/linux/netfilter_ipv4/ipt_IMQ.h	1970-01-01 01:00:00.000000000 +0100
+++ linux-3.10.30/include/linux/netfilter_ipv4/ipt_IMQ.h	2014-02-14 20:29:05.379402305 +0100
@@ -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 */
+
diff -Naur linux-3.10.30.org/include/linux/netfilter_ipv6/ip6t_IMQ.h linux-3.10.30/include/linux/netfilter_ipv6/ip6t_IMQ.h
--- linux-3.10.30.org/include/linux/netfilter_ipv6/ip6t_IMQ.h	1970-01-01 01:00:00.000000000 +0100
+++ linux-3.10.30/include/linux/netfilter_ipv6/ip6t_IMQ.h	2014-02-14 20:29:05.379402305 +0100
@@ -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 */
+
diff -Naur linux-3.10.30.org/include/linux/skbuff.h linux-3.10.30/include/linux/skbuff.h
--- linux-3.10.30.org/include/linux/skbuff.h	2014-02-13 22:48:15.000000000 +0100
+++ linux-3.10.30/include/linux/skbuff.h	2014-02-14 20:29:05.379402305 +0100
@@ -33,6 +33,9 @@
 #include <linux/dma-mapping.h>
 #include <linux/netdev_features.h>
 #include <net/flow_keys.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
@@ -414,6 +417,9 @@
 	 * 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_refdst;
 #ifdef CONFIG_XFRM
@@ -449,6 +455,9 @@
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 	struct nf_conntrack	*nfct;
 #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
@@ -487,7 +496,9 @@
 	__u8			encapsulation:1;
 	/* 7/9 bit hole (depending on ndisc_nodetype presence) */
 	kmemcheck_bitfield_end(flags2);
-
+#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
@@ -616,7 +627,10 @@
 {
 	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 kfree_skb_list(struct sk_buff *segs);
 extern void skb_tx_error(struct sk_buff *skb);
@@ -2735,6 +2749,10 @@
 	nf_conntrack_get(src->nfct);
 	dst->nfctinfo = src->nfctinfo;
 #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 -Naur linux-3.10.30.org/include/net/netfilter/nf_queue.h linux-3.10.30/include/net/netfilter/nf_queue.h
--- linux-3.10.30.org/include/net/netfilter/nf_queue.h	2014-02-13 22:48:15.000000000 +0100
+++ linux-3.10.30/include/net/netfilter/nf_queue.h	2014-02-14 20:29:05.382736249 +0100
@@ -29,6 +29,12 @@
 void nf_register_queue_handler(const struct nf_queue_handler *qh);
 void nf_unregister_queue_handler(void);
 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
 
 bool nf_queue_entry_get_refs(struct nf_queue_entry *entry);
 void nf_queue_entry_release_refs(struct nf_queue_entry *entry);
diff -Naur linux-3.10.30.org/include/uapi/linux/netfilter.h linux-3.10.30/include/uapi/linux/netfilter.h
--- linux-3.10.30.org/include/uapi/linux/netfilter.h	2014-02-13 22:48:15.000000000 +0100
+++ linux-3.10.30/include/uapi/linux/netfilter.h	2014-02-14 20:29:05.382736249 +0100
@@ -13,7 +13,8 @@
 #define NF_QUEUE 3
 #define NF_REPEAT 4
 #define NF_STOP 5
-#define NF_MAX_VERDICT NF_STOP
+#define NF_IMQ_QUEUE 6
+#define NF_MAX_VERDICT NF_IMQ_QUEUE
 
 /* we overload the higher bits for encoding auxiliary data such as the queue
  * number or errno values. Not nice, but better than additional function
diff -Naur linux-3.10.30.org/net/core/dev.c linux-3.10.30/net/core/dev.c
--- linux-3.10.30.org/net/core/dev.c	2014-02-13 22:48:15.000000000 +0100
+++ linux-3.10.30/net/core/dev.c	2014-02-14 20:29:05.382736249 +0100
@@ -129,6 +129,9 @@
 #include <linux/inetdevice.h>
 #include <linux/cpu_rmap.h>
 #include <linux/static_key.h>
+#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
+#include <linux/imq.h>
+#endif
 
 #include "net-sysfs.h"
 
@@ -2573,7 +2576,12 @@
 			}
 		}
 
+#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
+		if (!list_empty(&ptype_all) &&
+					!(skb->imq_flags & IMQ_F_ENQUEUE))
+#else
 		if (!list_empty(&ptype_all))
+#endif
 			dev_queue_xmit_nit(skb, dev);
 
 		skb_len = skb->len;
diff -Naur linux-3.10.30.org/net/core/skbuff.c linux-3.10.30/net/core/skbuff.c
--- linux-3.10.30.org/net/core/skbuff.c	2014-02-13 22:48:15.000000000 +0100
+++ linux-3.10.30/net/core/skbuff.c	2014-02-14 21:47:17.286039229 +0100
@@ -73,6 +73,9 @@
 
 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
 
 /**
  *	skb_panic - private function for out-of-line support
@@ -552,6 +555,29 @@
 		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())
+			pr_warn("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())
+		pr_warn("%s\n", "IMQ: kfree_skb: skb->nf_queue_entry != NULL");
+#endif
+
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 	nf_conntrack_put(skb->nfct);
 #endif
@@ -683,6 +709,10 @@
 	new->sp			= secpath_get(old->sp);
 #endif
 	memcpy(new->cb, old->cb, sizeof(old->cb));
+#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
+	new->cb_next = NULL;
+	/*skb_copy_stored_cb(new, old);*/
+#endif
 	new->csum		= old->csum;
 	new->local_df		= old->local_df;
 	new->pkt_type		= old->pkt_type;
@@ -3050,6 +3080,15 @@
 }
 EXPORT_SYMBOL_GPL(skb_gro_receive);
 
+#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
+/* Control buffer save/restore for IMQ devices */
+struct skb_cb_table {
+	char			cb[48] __aligned(8);
+	void			*cb_next;
+	atomic_t		refcnt;
+};
+#endif
+
 void __init skb_init(void)
 {
 	skbuff_head_cache = kmem_cache_create("skbuff_head_cache",
@@ -3063,6 +3102,13 @@
 						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
 }
 
 /**
@@ -3348,6 +3394,76 @@
 EXPORT_SYMBOL_GPL(skb_complete_wifi_ack);
 
 
+#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
+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
+
 /**
  * skb_partial_csum_set - set up and verify partial csum values for packet
  * @skb: the skb to set
diff -Naur linux-3.10.30.org/net/ipv6/ip6_output.c linux-3.10.30/net/ipv6/ip6_output.c
--- linux-3.10.30.org/net/ipv6/ip6_output.c	2014-02-13 22:48:15.000000000 +0100
+++ linux-3.10.30/net/ipv6/ip6_output.c	2014-02-14 20:29:05.392738001 +0100
@@ -89,9 +89,6 @@
 	struct in6_addr *nexthop;
 	int ret;
 
-	skb->protocol = htons(ETH_P_IPV6);
-	skb->dev = dev;
-
 	if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
 		struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
 
@@ -168,6 +165,13 @@
 		return 0;
 	}
 
+	/*
+	 * IMQ-patch: moved setting skb->dev and skb->protocol from
+	 * ip6_finish_output2 to fix crashing at netif_skb_features().
+	 */
+	skb->protocol = htons(ETH_P_IPV6);
+	skb->dev = dev;
+
 	return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, dev,
 			    ip6_finish_output,
 			    !(IP6CB(skb)->flags & IP6SKB_REROUTED));
diff -Naur linux-3.10.30.org/net/ipv6/ip6_output.c.orig linux-3.10.30/net/ipv6/ip6_output.c.orig
--- linux-3.10.30.org/net/ipv6/ip6_output.c.orig	1970-01-01 01:00:00.000000000 +0100
+++ linux-3.10.30/net/ipv6/ip6_output.c.orig	2014-02-14 20:29:05.392738001 +0100
@@ -0,0 +1,1580 @@
+/*
+ *	IPv6 output functions
+ *	Linux INET6 implementation
+ *
+ *	Authors:
+ *	Pedro Roque		<roque@di.fc.ul.pt>
+ *
+ *	Based on linux/net/ipv4/ip_output.c
+ *
+ *	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.
+ *
+ *	Changes:
+ *	A.N.Kuznetsov	:	airthmetics in fragmentation.
+ *				extension headers are implemented.
+ *				route changes now work.
+ *				ip6_forward does not confuse sniffers.
+ *				etc.
+ *
+ *      H. von Brand    :       Added missing #include <linux/string.h>
+ *	Imran Patel	: 	frag id should be in NBO
+ *      Kazunori MIYAZAWA @USAGI
+ *			:       add ip6_append_data and related functions
+ *				for datagram xmit
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/socket.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/in6.h>
+#include <linux/tcp.h>
+#include <linux/route.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/protocol.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/rawv6.h>
+#include <net/icmp.h>
+#include <net/xfrm.h>
+#include <net/checksum.h>
+#include <linux/mroute6.h>
+
+int __ip6_local_out(struct sk_buff *skb)
+{
+	int len;
+
+	len = skb->len - sizeof(struct ipv6hdr);
+	if (len > IPV6_MAXPLEN)
+		len = 0;
+	ipv6_hdr(skb)->payload_len = htons(len);
+
+	return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
+		       skb_dst(skb)->dev, dst_output);
+}
+
+int ip6_local_out(struct sk_buff *skb)
+{
+	int err;
+
+	err = __ip6_local_out(skb);
+	if (likely(err == 1))
+		err = dst_output(skb);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(ip6_local_out);
+
+static int ip6_finish_output2(struct sk_buff *skb)
+{
+	struct dst_entry *dst = skb_dst(skb);
+	struct net_device *dev = dst->dev;
+	struct neighbour *neigh;
+	struct in6_addr *nexthop;
+	int ret;
+
+	skb->protocol = htons(ETH_P_IPV6);
+	skb->dev = dev;
+
+	if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
+		struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
+
+		if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(skb->sk) &&
+		    ((mroute6_socket(dev_net(dev), skb) &&
+		     !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
+		     ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
+					 &ipv6_hdr(skb)->saddr))) {
+			struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
+
+			/* Do not check for IFF_ALLMULTI; multicast routing
+			   is not supported in any case.
+			 */
+			if (newskb)
+				NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING,
+					newskb, NULL, newskb->dev,
+					dev_loopback_xmit);
+
+			if (ipv6_hdr(skb)->hop_limit == 0) {
+				IP6_INC_STATS(dev_net(dev), idev,
+					      IPSTATS_MIB_OUTDISCARDS);
+				kfree_skb(skb);
+				return 0;
+			}
+		}
+
+		IP6_UPD_PO_STATS(dev_net(dev), idev, IPSTATS_MIB_OUTMCAST,
+				skb->len);
+
+		if (IPV6_ADDR_MC_SCOPE(&ipv6_hdr(skb)->daddr) <=
+		    IPV6_ADDR_SCOPE_NODELOCAL &&
+		    !(dev->flags & IFF_LOOPBACK)) {
+			kfree_skb(skb);
+			return 0;
+		}
+	}
+
+	rcu_read_lock_bh();
+	nexthop = rt6_nexthop((struct rt6_info *)dst);
+	neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
+	if (unlikely(!neigh))
+		neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
+	if (!IS_ERR(neigh)) {
+		ret = dst_neigh_output(dst, neigh, skb);
+		rcu_read_unlock_bh();
+		return ret;
+	}
+	rcu_read_unlock_bh();
+
+	IP6_INC_STATS(dev_net(dst->dev),
+		      ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
+	kfree_skb(skb);
+	return -EINVAL;
+}
+
+static int ip6_finish_output(struct sk_buff *skb)
+{
+	if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) ||
+	    dst_allfrag(skb_dst(skb)) ||
+	    (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size))
+		return ip6_fragment(skb, ip6_finish_output2);
+	else
+		return ip6_finish_output2(skb);
+}
+
+int ip6_output(struct sk_buff *skb)
+{
+	struct net_device *dev = skb_dst(skb)->dev;
+	struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
+	if (unlikely(idev->cnf.disable_ipv6)) {
+		IP6_INC_STATS(dev_net(dev), idev,
+			      IPSTATS_MIB_OUTDISCARDS);
+		kfree_skb(skb);
+		return 0;
+	}
+
+	return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, dev,
+			    ip6_finish_output,
+			    !(IP6CB(skb)->flags & IP6SKB_REROUTED));
+}
+
+/*
+ *	xmit an sk_buff (used by TCP, SCTP and DCCP)
+ */
+
+int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
+	     struct ipv6_txoptions *opt, int tclass)
+{
+	struct net *net = sock_net(sk);
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct in6_addr *first_hop = &fl6->daddr;
+	struct dst_entry *dst = skb_dst(skb);
+	struct ipv6hdr *hdr;
+	u8  proto = fl6->flowi6_proto;
+	int seg_len = skb->len;
+	int hlimit = -1;
+	u32 mtu;
+
+	if (opt) {
+		unsigned int head_room;
+
+		/* First: exthdrs may take lots of space (~8K for now)
+		   MAX_HEADER is not enough.
+		 */
+		head_room = opt->opt_nflen + opt->opt_flen;
+		seg_len += head_room;
+		head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev);
+
+		if (skb_headroom(skb) < head_room) {
+			struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room);
+			if (skb2 == NULL) {
+				IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+					      IPSTATS_MIB_OUTDISCARDS);
+				kfree_skb(skb);
+				return -ENOBUFS;
+			}
+			consume_skb(skb);
+			skb = skb2;
+			skb_set_owner_w(skb, sk);
+		}
+		if (opt->opt_flen)
+			ipv6_push_frag_opts(skb, opt, &proto);
+		if (opt->opt_nflen)
+			ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop);
+	}
+
+	skb_push(skb, sizeof(struct ipv6hdr));
+	skb_reset_network_header(skb);
+	hdr = ipv6_hdr(skb);
+
+	/*
+	 *	Fill in the IPv6 header
+	 */
+	if (np)
+		hlimit = np->hop_limit;
+	if (hlimit < 0)
+		hlimit = ip6_dst_hoplimit(dst);
+
+	ip6_flow_hdr(hdr, tclass, fl6->flowlabel);
+
+	hdr->payload_len = htons(seg_len);
+	hdr->nexthdr = proto;
+	hdr->hop_limit = hlimit;
+
+	hdr->saddr = fl6->saddr;
+	hdr->daddr = *first_hop;
+
+	skb->priority = sk->sk_priority;
+	skb->mark = sk->sk_mark;
+
+	mtu = dst_mtu(dst);
+	if ((skb->len <= mtu) || skb->local_df || skb_is_gso(skb)) {
+		IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)),
+			      IPSTATS_MIB_OUT, skb->len);
+		return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
+			       dst->dev, dst_output);
+	}
+
+	skb->dev = dst->dev;
+	ipv6_local_error(sk, EMSGSIZE, fl6, mtu);
+	IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS);
+	kfree_skb(skb);
+	return -EMSGSIZE;
+}
+
+EXPORT_SYMBOL(ip6_xmit);
+
+static int ip6_call_ra_chain(struct sk_buff *skb, int sel)
+{
+	struct ip6_ra_chain *ra;
+	struct sock *last = NULL;
+
+	read_lock(&ip6_ra_lock);
+	for (ra = ip6_ra_chain; ra; ra = ra->next) {
+		struct sock *sk = ra->sk;
+		if (sk && ra->sel == sel &&
+		    (!sk->sk_bound_dev_if ||
+		     sk->sk_bound_dev_if == skb->dev->ifindex)) {
+			if (last) {
+				struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+				if (skb2)
+					rawv6_rcv(last, skb2);
+			}
+			last = sk;
+		}
+	}
+
+	if (last) {
+		rawv6_rcv(last, skb);
+		read_unlock(&ip6_ra_lock);
+		return 1;
+	}
+	read_unlock(&ip6_ra_lock);
+	return 0;
+}
+
+static int ip6_forward_proxy_check(struct sk_buff *skb)
+{
+	struct ipv6hdr *hdr = ipv6_hdr(skb);
+	u8 nexthdr = hdr->nexthdr;
+	__be16 frag_off;
+	int offset;
+
+	if (ipv6_ext_hdr(nexthdr)) {
+		offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off);
+		if (offset < 0)
+			return 0;
+	} else
+		offset = sizeof(struct ipv6hdr);
+
+	if (nexthdr == IPPROTO_ICMPV6) {
+		struct icmp6hdr *icmp6;
+
+		if (!pskb_may_pull(skb, (skb_network_header(skb) +
+					 offset + 1 - skb->data)))
+			return 0;
+
+		icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
+
+		switch (icmp6->icmp6_type) {
+		case NDISC_ROUTER_SOLICITATION:
+		case NDISC_ROUTER_ADVERTISEMENT:
+		case NDISC_NEIGHBOUR_SOLICITATION:
+		case NDISC_NEIGHBOUR_ADVERTISEMENT:
+		case NDISC_REDIRECT:
+			/* For reaction involving unicast neighbor discovery
+			 * message destined to the proxied address, pass it to
+			 * input function.
+			 */
+			return 1;
+		default:
+			break;
+		}
+	}
+
+	/*
+	 * The proxying router can't forward traffic sent to a link-local
+	 * address, so signal the sender and discard the packet. This
+	 * behavior is clarified by the MIPv6 specification.
+	 */
+	if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) {
+		dst_link_failure(skb);
+		return -1;
+	}
+
+	return 0;
+}
+
+static inline int ip6_forward_finish(struct sk_buff *skb)
+{
+	return dst_output(skb);
+}
+
+int ip6_forward(struct sk_buff *skb)
+{
+	struct dst_entry *dst = skb_dst(skb);
+	struct ipv6hdr *hdr = ipv6_hdr(skb);
+	struct inet6_skb_parm *opt = IP6CB(skb);
+	struct net *net = dev_net(dst->dev);
+	u32 mtu;
+
+	if (net->ipv6.devconf_all->forwarding == 0)
+		goto error;
+
+	if (skb_warn_if_lro(skb))
+		goto drop;
+
+	if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) {
+		IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS);
+		goto drop;
+	}
+
+	if (skb->pkt_type != PACKET_HOST)
+		goto drop;
+
+	skb_forward_csum(skb);
+
+	/*
+	 *	We DO NOT make any processing on
+	 *	RA packets, pushing them to user level AS IS
+	 *	without ane WARRANTY that application will be able
+	 *	to interpret them. The reason is that we
+	 *	cannot make anything clever here.
+	 *
+	 *	We are not end-node, so that if packet contains
+	 *	AH/ESP, we cannot make anything.
+	 *	Defragmentation also would be mistake, RA packets
+	 *	cannot be fragmented, because there is no warranty
+	 *	that different fragments will go along one path. --ANK
+	 */
+	if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) {
+		if (ip6_call_ra_chain(skb, ntohs(opt->ra)))
+			return 0;
+	}
+
+	/*
+	 *	check and decrement ttl
+	 */
+	if (hdr->hop_limit <= 1) {
+		/* Force OUTPUT device used as source address */
+		skb->dev = dst->dev;
+		icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0);
+		IP6_INC_STATS_BH(net,
+				 ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS);
+
+		kfree_skb(skb);
+		return -ETIMEDOUT;
+	}
+
+	/* XXX: idev->cnf.proxy_ndp? */
+	if (net->ipv6.devconf_all->proxy_ndp &&
+	    pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) {
+		int proxied = ip6_forward_proxy_check(skb);
+		if (proxied > 0)
+			return ip6_input(skb);
+		else if (proxied < 0) {
+			IP6_INC_STATS(net, ip6_dst_idev(dst),
+				      IPSTATS_MIB_INDISCARDS);
+			goto drop;
+		}
+	}
+
+	if (!xfrm6_route_forward(skb)) {
+		IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS);
+		goto drop;
+	}
+	dst = skb_dst(skb);
+
+	/* IPv6 specs say nothing about it, but it is clear that we cannot
+	   send redirects to source routed frames.
+	   We don't send redirects to frames decapsulated from IPsec.
+	 */
+	if (skb->dev == dst->dev && opt->srcrt == 0 && !skb_sec_path(skb)) {
+		struct in6_addr *target = NULL;
+		struct inet_peer *peer;
+		struct rt6_info *rt;
+
+		/*
+		 *	incoming and outgoing devices are the same
+		 *	send a redirect.
+		 */
+
+		rt = (struct rt6_info *) dst;
+		if (rt->rt6i_flags & RTF_GATEWAY)
+			target = &rt->rt6i_gateway;
+		else
+			target = &hdr->daddr;
+
+		peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
+
+		/* Limit redirects both by destination (here)
+		   and by source (inside ndisc_send_redirect)
+		 */
+		if (inet_peer_xrlim_allow(peer, 1*HZ))
+			ndisc_send_redirect(skb, target);
+		if (peer)
+			inet_putpeer(peer);
+	} else {
+		int addrtype = ipv6_addr_type(&hdr->saddr);
+
+		/* This check is security critical. */
+		if (addrtype == IPV6_ADDR_ANY ||
+		    addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK))
+			goto error;
+		if (addrtype & IPV6_ADDR_LINKLOCAL) {
+			icmpv6_send(skb, ICMPV6_DEST_UNREACH,
+				    ICMPV6_NOT_NEIGHBOUR, 0);
+			goto error;
+		}
+	}
+
+	mtu = dst_mtu(dst);
+	if (mtu < IPV6_MIN_MTU)
+		mtu = IPV6_MIN_MTU;
+
+	if ((!skb->local_df && skb->len > mtu && !skb_is_gso(skb)) ||
+	    (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)) {
+		/* Again, force OUTPUT device used as source address */
+		skb->dev = dst->dev;
+		icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+		IP6_INC_STATS_BH(net,
+				 ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS);
+		IP6_INC_STATS_BH(net,
+				 ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS);
+		kfree_skb(skb);
+		return -EMSGSIZE;
+	}
+
+	if (skb_cow(skb, dst->dev->hard_header_len)) {
+		IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS);
+		goto drop;
+	}
+
+	hdr = ipv6_hdr(skb);
+
+	/* Mangling hops number delayed to point after skb COW */
+
+	hdr->hop_limit--;
+
+	IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS);
+	IP6_ADD_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len);
+	return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dst->dev,
+		       ip6_forward_finish);
+
+error:
+	IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS);
+drop:
+	kfree_skb(skb);
+	return -EINVAL;
+}
+
+static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from)
+{
+	to->pkt_type = from->pkt_type;
+	to->priority = from->priority;
+	to->protocol = from->protocol;
+	skb_dst_drop(to);
+	skb_dst_set(to, dst_clone(skb_dst(from)));
+	to->dev = from->dev;
+	to->mark = from->mark;
+
+#ifdef CONFIG_NET_SCHED
+	to->tc_index = from->tc_index;
+#endif
+	nf_copy(to, from);
+#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
+	to->nf_trace = from->nf_trace;
+#endif
+	skb_copy_secmark(to, from);
+}
+
+int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
+{
+	struct sk_buff *frag;
+	struct rt6_info *rt = (struct rt6_info*)skb_dst(skb);
+	struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
+	struct ipv6hdr *tmp_hdr;
+	struct frag_hdr *fh;
+	unsigned int mtu, hlen, left, len;
+	int hroom, troom;
+	__be32 frag_id = 0;
+	int ptr, offset = 0, err=0;
+	u8 *prevhdr, nexthdr = 0;
+	struct net *net = dev_net(skb_dst(skb)->dev);
+
+	hlen = ip6_find_1stfragopt(skb, &prevhdr);
+	nexthdr = *prevhdr;
+
+	mtu = ip6_skb_dst_mtu(skb);
+
+	/* We must not fragment if the socket is set to force MTU discovery
+	 * or if the skb it not generated by a local socket.
+	 */
+	if (unlikely(!skb->local_df && skb->len > mtu) ||
+		     (IP6CB(skb)->frag_max_size &&
+		      IP6CB(skb)->frag_max_size > mtu)) {
+		if (skb->sk && dst_allfrag(skb_dst(skb)))
+			sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK);
+
+		skb->dev = skb_dst(skb)->dev;
+		icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+		IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+			      IPSTATS_MIB_FRAGFAILS);
+		kfree_skb(skb);
+		return -EMSGSIZE;
+	}
+
+	if (np && np->frag_size < mtu) {
+		if (np->frag_size)
+			mtu = np->frag_size;
+	}
+	mtu -= hlen + sizeof(struct frag_hdr);
+
+	if (skb_has_frag_list(skb)) {
+		int first_len = skb_pagelen(skb);
+		struct sk_buff *frag2;
+
+		if (first_len - hlen > mtu ||
+		    ((first_len - hlen) & 7) ||
+		    skb_cloned(skb))
+			goto slow_path;
+
+		skb_walk_frags(skb, frag) {
+			/* Correct geometry. */
+			if (frag->len > mtu ||
+			    ((frag->len & 7) && frag->next) ||
+			    skb_headroom(frag) < hlen)
+				goto slow_path_clean;
+
+			/* Partially cloned skb? */
+			if (skb_shared(frag))
+				goto slow_path_clean;
+
+			BUG_ON(frag->sk);
+			if (skb->sk) {
+				frag->sk = skb->sk;
+				frag->destructor = sock_wfree;
+			}
+			skb->truesize -= frag->truesize;
+		}
+
+		err = 0;
+		offset = 0;
+		frag = skb_shinfo(skb)->frag_list;
+		skb_frag_list_init(skb);
+		/* BUILD HEADER */
+
+		*prevhdr = NEXTHDR_FRAGMENT;
+		tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC);
+		if (!tmp_hdr) {
+			IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+				      IPSTATS_MIB_FRAGFAILS);
+			return -ENOMEM;
+		}
+
+		__skb_pull(skb, hlen);
+		fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr));
+		__skb_push(skb, hlen);
+		skb_reset_network_header(skb);
+		memcpy(skb_network_header(skb), tmp_hdr, hlen);
+
+		ipv6_select_ident(fh, rt);
+		fh->nexthdr = nexthdr;
+		fh->reserved = 0;
+		fh->frag_off = htons(IP6_MF);
+		frag_id = fh->identification;
+
+		first_len = skb_pagelen(skb);
+		skb->data_len = first_len - skb_headlen(skb);
+		skb->len = first_len;
+		ipv6_hdr(skb)->payload_len = htons(first_len -
+						   sizeof(struct ipv6hdr));
+
+		dst_hold(&rt->dst);
+
+		for (;;) {
+			/* Prepare header of the next frame,
+			 * before previous one went down. */
+			if (frag) {
+				frag->ip_summed = CHECKSUM_NONE;
+				skb_reset_transport_header(frag);
+				fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr));
+				__skb_push(frag, hlen);
+				skb_reset_network_header(frag);
+				memcpy(skb_network_header(frag), tmp_hdr,
+				       hlen);
+				offset += skb->len - hlen - sizeof(struct frag_hdr);
+				fh->nexthdr = nexthdr;
+				fh->reserved = 0;
+				fh->frag_off = htons(offset);
+				if (frag->next != NULL)
+					fh->frag_off |= htons(IP6_MF);
+				fh->identification = frag_id;
+				ipv6_hdr(frag)->payload_len =
+						htons(frag->len -
+						      sizeof(struct ipv6hdr));
+				ip6_copy_metadata(frag, skb);
+			}
+
+			err = output(skb);
+			if(!err)
+				IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
+					      IPSTATS_MIB_FRAGCREATES);
+
+			if (err || !frag)
+				break;
+
+			skb = frag;
+			frag = skb->next;
+			skb->next = NULL;
+		}
+
+		kfree(tmp_hdr);
+
+		if (err == 0) {
+			IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
+				      IPSTATS_MIB_FRAGOKS);
+			ip6_rt_put(rt);
+			return 0;
+		}
+
+		while (frag) {
+			skb = frag->next;
+			kfree_skb(frag);
+			frag = skb;
+		}
+
+		IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
+			      IPSTATS_MIB_FRAGFAILS);
+		ip6_rt_put(rt);
+		return err;
+
+slow_path_clean:
+		skb_walk_frags(skb, frag2) {
+			if (frag2 == frag)
+				break;
+			frag2->sk = NULL;
+			frag2->destructor = NULL;
+			skb->truesize += frag2->truesize;
+		}
+	}
+
+slow_path:
+	if ((skb->ip_summed == CHECKSUM_PARTIAL) &&
+	    skb_checksum_help(skb))
+		goto fail;
+
+	left = skb->len - hlen;		/* Space per frame */
+	ptr = hlen;			/* Where to start from */
+
+	/*
+	 *	Fragment the datagram.
+	 */
+
+	*prevhdr = NEXTHDR_FRAGMENT;
+	hroom = LL_RESERVED_SPACE(rt->dst.dev);
+	troom = rt->dst.dev->needed_tailroom;
+
+	/*
+	 *	Keep copying data until we run out.
+	 */
+	while(left > 0)	{
+		len = left;
+		/* IF: it doesn't fit, use 'mtu' - the data space left */
+		if (len > mtu)
+			len = mtu;
+		/* IF: we are not sending up to and including the packet end
+		   then align the next start on an eight byte boundary */
+		if (len < left)	{
+			len &= ~7;
+		}
+		/*
+		 *	Allocate buffer.
+		 */
+
+		if ((frag = alloc_skb(len + hlen + sizeof(struct frag_hdr) +
+				      hroom + troom, GFP_ATOMIC)) == NULL) {
+			NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n");
+			IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+				      IPSTATS_MIB_FRAGFAILS);
+			err = -ENOMEM;
+			goto fail;
+		}
+
+		/*
+		 *	Set up data on packet
+		 */
+
+		ip6_copy_metadata(frag, skb);
+		skb_reserve(frag, hroom);
+		skb_put(frag, len + hlen + sizeof(struct frag_hdr));
+		skb_reset_network_header(frag);
+		fh = (struct frag_hdr *)(skb_network_header(frag) + hlen);
+		frag->transport_header = (frag->network_header + hlen +
+					  sizeof(struct frag_hdr));
+
+		/*
+		 *	Charge the memory for the fragment to any owner
+		 *	it might possess
+		 */
+		if (skb->sk)
+			skb_set_owner_w(frag, skb->sk);
+
+		/*
+		 *	Copy the packet header into the new buffer.
+		 */
+		skb_copy_from_linear_data(skb, skb_network_header(frag), hlen);
+
+		/*
+		 *	Build fragment header.
+		 */
+		fh->nexthdr = nexthdr;
+		fh->reserved = 0;
+		if (!frag_id) {
+			ipv6_select_ident(fh, rt);
+			frag_id = fh->identification;
+		} else
+			fh->identification = frag_id;
+
+		/*
+		 *	Copy a block of the IP datagram.
+		 */
+		if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len))
+			BUG();
+		left -= len;
+
+		fh->frag_off = htons(offset);
+		if (left > 0)
+			fh->frag_off |= htons(IP6_MF);
+		ipv6_hdr(frag)->payload_len = htons(frag->len -
+						    sizeof(struct ipv6hdr));
+
+		ptr += len;
+		offset += len;
+
+		/*
+		 *	Put this fragment into the sending queue.
+		 */
+		err = output(frag);
+		if (err)
+			goto fail;
+
+		IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+			      IPSTATS_MIB_FRAGCREATES);
+	}
+	IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+		      IPSTATS_MIB_FRAGOKS);
+	consume_skb(skb);
+	return err;
+
+fail:
+	IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+		      IPSTATS_MIB_FRAGFAILS);
+	kfree_skb(skb);
+	return err;
+}
+
+static inline int ip6_rt_check(const struct rt6key *rt_key,
+			       const struct in6_addr *fl_addr,
+			       const struct in6_addr *addr_cache)
+{
+	return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) &&
+		(addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache));
+}
+
+static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
+					  struct dst_entry *dst,
+					  const struct flowi6 *fl6)
+{
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct rt6_info *rt;
+
+	if (!dst)
+		goto out;
+
+	if (dst->ops->family != AF_INET6) {
+		dst_release(dst);
+		return NULL;
+	}
+
+	rt = (struct rt6_info *)dst;
+	/* Yes, checking route validity in not connected
+	 * case is not very simple. Take into account,
+	 * that we do not support routing by source, TOS,
+	 * and MSG_DONTROUTE 		--ANK (980726)
+	 *
+	 * 1. ip6_rt_check(): If route was host route,
+	 *    check that cached destination is current.
+	 *    If it is network route, we still may
+	 *    check its validity using saved pointer
+	 *    to the last used address: daddr_cache.
+	 *    We do not want to save whole address now,
+	 *    (because main consumer of this service
+	 *    is tcp, which has not this problem),
+	 *    so that the last trick works only on connected
+	 *    sockets.
+	 * 2. oif also should be the same.
+	 */
+	if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) ||
+#ifdef CONFIG_IPV6_SUBTREES
+	    ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) ||
+#endif
+	    (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex)) {
+		dst_release(dst);
+		dst = NULL;
+	}
+
+out:
+	return dst;
+}
+
+static int ip6_dst_lookup_tail(struct sock *sk,
+			       struct dst_entry **dst, struct flowi6 *fl6)
+{
+	struct net *net = sock_net(sk);
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+	struct neighbour *n;
+	struct rt6_info *rt;
+#endif
+	int err;
+
+	if (*dst == NULL)
+		*dst = ip6_route_output(net, sk, fl6);
+
+	if ((err = (*dst)->error))
+		goto out_err_release;
+
+	if (ipv6_addr_any(&fl6->saddr)) {
+		struct rt6_info *rt = (struct rt6_info *) *dst;
+		err = ip6_route_get_saddr(net, rt, &fl6->daddr,
+					  sk ? inet6_sk(sk)->srcprefs : 0,
+					  &fl6->saddr);
+		if (err)
+			goto out_err_release;
+	}
+
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+	/*
+	 * Here if the dst entry we've looked up
+	 * has a neighbour entry that is in the INCOMPLETE
+	 * state and the src address from the flow is
+	 * marked as OPTIMISTIC, we release the found
+	 * dst entry and replace it instead with the
+	 * dst entry of the nexthop router
+	 */
+	rt = (struct rt6_info *) *dst;
+	rcu_read_lock_bh();
+	n = __ipv6_neigh_lookup_noref(rt->dst.dev, rt6_nexthop(rt));
+	err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0;
+	rcu_read_unlock_bh();
+
+	if (err) {
+		struct inet6_ifaddr *ifp;
+		struct flowi6 fl_gw6;
+		int redirect;
+
+		ifp = ipv6_get_ifaddr(net, &fl6->saddr,
+				      (*dst)->dev, 1);
+
+		redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC);
+		if (ifp)
+			in6_ifa_put(ifp);
+
+		if (redirect) {
+			/*
+			 * We need to get the dst entry for the
+			 * default router instead
+			 */
+			dst_release(*dst);
+			memcpy(&fl_gw6, fl6, sizeof(struct flowi6));
+			memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr));
+			*dst = ip6_route_output(net, sk, &fl_gw6);
+			if ((err = (*dst)->error))
+				goto out_err_release;
+		}
+	}
+#endif
+
+	return 0;
+
+out_err_release:
+	if (err == -ENETUNREACH)
+		IP6_INC_STATS_BH(net, NULL, IPSTATS_MIB_OUTNOROUTES);
+	dst_release(*dst);
+	*dst = NULL;
+	return err;
+}
+
+/**
+ *	ip6_dst_lookup - perform route lookup on flow
+ *	@sk: socket which provides route info
+ *	@dst: pointer to dst_entry * for result
+ *	@fl6: flow to lookup
+ *
+ *	This function performs a route lookup on the given flow.
+ *
+ *	It returns zero on success, or a standard errno code on error.
+ */
+int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6)
+{
+	*dst = NULL;
+	return ip6_dst_lookup_tail(sk, dst, fl6);
+}
+EXPORT_SYMBOL_GPL(ip6_dst_lookup);
+
+/**
+ *	ip6_dst_lookup_flow - perform route lookup on flow with ipsec
+ *	@sk: socket which provides route info
+ *	@fl6: flow to lookup
+ *	@final_dst: final destination address for ipsec lookup
+ *	@can_sleep: we are in a sleepable context
+ *
+ *	This function performs a route lookup on the given flow.
+ *
+ *	It returns a valid dst pointer on success, or a pointer encoded
+ *	error code.
+ */
+struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
+				      const struct in6_addr *final_dst,
+				      bool can_sleep)
+{
+	struct dst_entry *dst = NULL;
+	int err;
+
+	err = ip6_dst_lookup_tail(sk, &dst, fl6);
+	if (err)
+		return ERR_PTR(err);
+	if (final_dst)
+		fl6->daddr = *final_dst;
+	if (can_sleep)
+		fl6->flowi6_flags |= FLOWI_FLAG_CAN_SLEEP;
+
+	return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
+}
+EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow);
+
+/**
+ *	ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow
+ *	@sk: socket which provides the dst cache and route info
+ *	@fl6: flow to lookup
+ *	@final_dst: final destination address for ipsec lookup
+ *	@can_sleep: we are in a sleepable context
+ *
+ *	This function performs a route lookup on the given flow with the
+ *	possibility of using the cached route in the socket if it is valid.
+ *	It will take the socket dst lock when operating on the dst cache.
+ *	As a result, this function can only be used in process context.
+ *
+ *	It returns a valid dst pointer on success, or a pointer encoded
+ *	error code.
+ */
+struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
+					 const struct in6_addr *final_dst,
+					 bool can_sleep)
+{
+	struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
+	int err;
+
+	dst = ip6_sk_dst_check(sk, dst, fl6);
+
+	err = ip6_dst_lookup_tail(sk, &dst, fl6);
+	if (err)
+		return ERR_PTR(err);
+	if (final_dst)
+		fl6->daddr = *final_dst;
+	if (can_sleep)
+		fl6->flowi6_flags |= FLOWI_FLAG_CAN_SLEEP;
+
+	return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0);
+}
+EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow);
+
+static inline int ip6_ufo_append_data(struct sock *sk,
+			int getfrag(void *from, char *to, int offset, int len,
+			int odd, struct sk_buff *skb),
+			void *from, int length, int hh_len, int fragheaderlen,
+			int transhdrlen, int mtu,unsigned int flags,
+			struct rt6_info *rt)
+
+{
+	struct sk_buff *skb;
+	int err;
+
+	/* There is support for UDP large send offload by network
+	 * device, so create one single skb packet containing complete
+	 * udp datagram
+	 */
+	if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) {
+		struct frag_hdr fhdr;
+
+		skb = sock_alloc_send_skb(sk,
+			hh_len + fragheaderlen + transhdrlen + 20,
+			(flags & MSG_DONTWAIT), &err);
+		if (skb == NULL)
+			return err;
+
+		/* reserve space for Hardware header */
+		skb_reserve(skb, hh_len);
+
+		/* create space for UDP/IP header */
+		skb_put(skb,fragheaderlen + transhdrlen);
+
+		/* initialize network header pointer */
+		skb_reset_network_header(skb);
+
+		/* initialize protocol header pointer */
+		skb->transport_header = skb->network_header + fragheaderlen;
+
+		skb->ip_summed = CHECKSUM_PARTIAL;
+		skb->csum = 0;
+
+		/* Specify the length of each IPv6 datagram fragment.
+		 * It has to be a multiple of 8.
+		 */
+		skb_shinfo(skb)->gso_size = (mtu - fragheaderlen -
+					     sizeof(struct frag_hdr)) & ~7;
+		skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
+		ipv6_select_ident(&fhdr, rt);
+		skb_shinfo(skb)->ip6_frag_id = fhdr.identification;
+		__skb_queue_tail(&sk->sk_write_queue, skb);
+	}
+
+	return skb_append_datato_frags(sk, skb, getfrag, from,
+				       (length - transhdrlen));
+}
+
+static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src,
+					       gfp_t gfp)
+{
+	return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
+}
+
+static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src,
+						gfp_t gfp)
+{
+	return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
+}
+
+static void ip6_append_data_mtu(unsigned int *mtu,
+				int *maxfraglen,
+				unsigned int fragheaderlen,
+				struct sk_buff *skb,
+				struct rt6_info *rt,
+				bool pmtuprobe)
+{
+	if (!(rt->dst.flags & DST_XFRM_TUNNEL)) {
+		if (skb == NULL) {
+			/* first fragment, reserve header_len */
+			*mtu = *mtu - rt->dst.header_len;
+
+		} else {
+			/*
+			 * this fragment is not first, the headers
+			 * space is regarded as data space.
+			 */
+			*mtu = min(*mtu, pmtuprobe ?
+				   rt->dst.dev->mtu :
+				   dst_mtu(rt->dst.path));
+		}
+		*maxfraglen = ((*mtu - fragheaderlen) & ~7)
+			      + fragheaderlen - sizeof(struct frag_hdr);
+	}
+}
+
+int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
+	int offset, int len, int odd, struct sk_buff *skb),
+	void *from, int length, int transhdrlen,
+	int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
+	struct rt6_info *rt, unsigned int flags, int dontfrag)
+{
+	struct inet_sock *inet = inet_sk(sk);
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct inet_cork *cork;
+	struct sk_buff *skb, *skb_prev = NULL;
+	unsigned int maxfraglen, fragheaderlen, mtu;
+	int exthdrlen;
+	int dst_exthdrlen;
+	int hh_len;
+	int copy;
+	int err;
+	int offset = 0;
+	__u8 tx_flags = 0;
+
+	if (flags&MSG_PROBE)
+		return 0;
+	cork = &inet->cork.base;
+	if (skb_queue_empty(&sk->sk_write_queue)) {
+		/*
+		 * setup for corking
+		 */
+		if (opt) {
+			if (WARN_ON(np->cork.opt))
+				return -EINVAL;
+
+			np->cork.opt = kzalloc(opt->tot_len, sk->sk_allocation);
+			if (unlikely(np->cork.opt == NULL))
+				return -ENOBUFS;
+
+			np->cork.opt->tot_len = opt->tot_len;
+			np->cork.opt->opt_flen = opt->opt_flen;
+			np->cork.opt->opt_nflen = opt->opt_nflen;
+
+			np->cork.opt->dst0opt = ip6_opt_dup(opt->dst0opt,
+							    sk->sk_allocation);
+			if (opt->dst0opt && !np->cork.opt->dst0opt)
+				return -ENOBUFS;
+
+			np->cork.opt->dst1opt = ip6_opt_dup(opt->dst1opt,
+							    sk->sk_allocation);
+			if (opt->dst1opt && !np->cork.opt->dst1opt)
+				return -ENOBUFS;
+
+			np->cork.opt->hopopt = ip6_opt_dup(opt->hopopt,
+							   sk->sk_allocation);
+			if (opt->hopopt && !np->cork.opt->hopopt)
+				return -ENOBUFS;
+
+			np->cork.opt->srcrt = ip6_rthdr_dup(opt->srcrt,
+							    sk->sk_allocation);
+			if (opt->srcrt && !np->cork.opt->srcrt)
+				return -ENOBUFS;
+
+			/* need source address above miyazawa*/
+		}
+		dst_hold(&rt->dst);
+		cork->dst = &rt->dst;
+		inet->cork.fl.u.ip6 = *fl6;
+		np->cork.hop_limit = hlimit;
+		np->cork.tclass = tclass;
+		if (rt->dst.flags & DST_XFRM_TUNNEL)
+			mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ?
+			      rt->dst.dev->mtu : dst_mtu(&rt->dst);
+		else
+			mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ?
+			      rt->dst.dev->mtu : dst_mtu(rt->dst.path);
+		if (np->frag_size < mtu) {
+			if (np->frag_size)
+				mtu = np->frag_size;
+		}
+		cork->fragsize = mtu;
+		if (dst_allfrag(rt->dst.path))
+			cork->flags |= IPCORK_ALLFRAG;
+		cork->length = 0;
+		exthdrlen = (opt ? opt->opt_flen : 0);
+		length += exthdrlen;
+		transhdrlen += exthdrlen;
+		dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len;
+	} else {
+		rt = (struct rt6_info *)cork->dst;
+		fl6 = &inet->cork.fl.u.ip6;
+		opt = np->cork.opt;
+		transhdrlen = 0;
+		exthdrlen = 0;
+		dst_exthdrlen = 0;
+		mtu = cork->fragsize;
+	}
+
+	hh_len = LL_RESERVED_SPACE(rt->dst.dev);
+
+	fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len +
+			(opt ? opt->opt_nflen : 0);
+	maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr);
+
+	if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) {
+		if (cork->length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) {
+			ipv6_local_error(sk, EMSGSIZE, fl6, mtu-exthdrlen);
+			return -EMSGSIZE;
+		}
+	}
+
+	/* For UDP, check if TX timestamp is enabled */
+	if (sk->sk_type == SOCK_DGRAM)
+		sock_tx_timestamp(sk, &tx_flags);
+
+	/*
+	 * Let's try using as much space as possible.
+	 * Use MTU if total length of the message fits into the MTU.
+	 * Otherwise, we need to reserve fragment header and
+	 * fragment alignment (= 8-15 octects, in total).
+	 *
+	 * Note that we may need to "move" the data from the tail of
+	 * of the buffer to the new fragment when we split
+	 * the message.
+	 *
+	 * FIXME: It may be fragmented into multiple chunks
+	 *        at once if non-fragmentable extension headers
+	 *        are too large.
+	 * --yoshfuji
+	 */
+
+	if ((length > mtu) && dontfrag && (sk->sk_protocol == IPPROTO_UDP ||
+					   sk->sk_protocol == IPPROTO_RAW)) {
+		ipv6_local_rxpmtu(sk, fl6, mtu-exthdrlen);
+		return -EMSGSIZE;
+	}
+
+	skb = skb_peek_tail(&sk->sk_write_queue);
+	cork->length += length;
+	if (((length > mtu) ||
+	     (skb && skb_has_frags(skb))) &&
+	    (sk->sk_protocol == IPPROTO_UDP) &&
+	    (rt->dst.dev->features & NETIF_F_UFO)) {
+		err = ip6_ufo_append_data(sk, getfrag, from, length,
+					  hh_len, fragheaderlen,
+					  transhdrlen, mtu, flags, rt);
+		if (err)
+			goto error;
+		return 0;
+	}
+
+	if (!skb)
+		goto alloc_new_skb;
+
+	while (length > 0) {
+		/* Check if the remaining data fits into current packet. */
+		copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len;
+		if (copy < length)
+			copy = maxfraglen - skb->len;
+
+		if (copy <= 0) {
+			char *data;
+			unsigned int datalen;
+			unsigned int fraglen;
+			unsigned int fraggap;
+			unsigned int alloclen;
+alloc_new_skb:
+			/* There's no room in the current skb */
+			if (skb)
+				fraggap = skb->len - maxfraglen;
+			else
+				fraggap = 0;
+			/* update mtu and maxfraglen if necessary */
+			if (skb == NULL || skb_prev == NULL)
+				ip6_append_data_mtu(&mtu, &maxfraglen,
+						    fragheaderlen, skb, rt,
+						    np->pmtudisc ==
+						    IPV6_PMTUDISC_PROBE);
+
+			skb_prev = skb;
+
+			/*
+			 * If remaining data exceeds the mtu,
+			 * we know we need more fragment(s).
+			 */
+			datalen = length + fraggap;
+
+			if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen)
+				datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len;
+			if ((flags & MSG_MORE) &&
+			    !(rt->dst.dev->features&NETIF_F_SG))
+				alloclen = mtu;
+			else
+				alloclen = datalen + fragheaderlen;
+
+			alloclen += dst_exthdrlen;
+
+			if (datalen != length + fraggap) {
+				/*
+				 * this is not the last fragment, the trailer
+				 * space is regarded as data space.
+				 */
+				datalen += rt->dst.trailer_len;
+			}
+
+			alloclen += rt->dst.trailer_len;
+			fraglen = datalen + fragheaderlen;
+
+			/*
+			 * We just reserve space for fragment header.
+			 * Note: this may be overallocation if the message
+			 * (without MSG_MORE) fits into the MTU.
+			 */
+			alloclen += sizeof(struct frag_hdr);
+
+			if (transhdrlen) {
+				skb = sock_alloc_send_skb(sk,
+						alloclen + hh_len,
+						(flags & MSG_DONTWAIT), &err);
+			} else {
+				skb = NULL;
+				if (atomic_read(&sk->sk_wmem_alloc) <=
+				    2 * sk->sk_sndbuf)
+					skb = sock_wmalloc(sk,
+							   alloclen + hh_len, 1,
+							   sk->sk_allocation);
+				if (unlikely(skb == NULL))
+					err = -ENOBUFS;
+				else {
+					/* Only the initial fragment
+					 * is time stamped.
+					 */
+					tx_flags = 0;
+				}
+			}
+			if (skb == NULL)
+				goto error;
+			/*
+			 *	Fill in the control structures
+			 */
+			skb->ip_summed = CHECKSUM_NONE;
+			skb->csum = 0;
+			/* reserve for fragmentation and ipsec header */
+			skb_reserve(skb, hh_len + sizeof(struct frag_hdr) +
+				    dst_exthdrlen);
+
+			if (sk->sk_type == SOCK_DGRAM)
+				skb_shinfo(skb)->tx_flags = tx_flags;
+
+			/*
+			 *	Find where to start putting bytes
+			 */
+			data = skb_put(skb, fraglen);
+			skb_set_network_header(skb, exthdrlen);
+			data += fragheaderlen;
+			skb->transport_header = (skb->network_header +
+						 fragheaderlen);
+			if (fraggap) {
+				skb->csum = skb_copy_and_csum_bits(
+					skb_prev, maxfraglen,
+					data + transhdrlen, fraggap, 0);
+				skb_prev->csum = csum_sub(skb_prev->csum,
+							  skb->csum);
+				data += fraggap;
+				pskb_trim_unique(skb_prev, maxfraglen);
+			}
+			copy = datalen - transhdrlen - fraggap;
+
+			if (copy < 0) {
+				err = -EINVAL;
+				kfree_skb(skb);
+				goto error;
+			} else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) {
+				err = -EFAULT;
+				kfree_skb(skb);
+				goto error;
+			}
+
+			offset += copy;
+			length -= datalen - fraggap;
+			transhdrlen = 0;
+			exthdrlen = 0;
+			dst_exthdrlen = 0;
+
+			/*
+			 * Put the packet on the pending queue
+			 */
+			__skb_queue_tail(&sk->sk_write_queue, skb);
+			continue;
+		}
+
+		if (copy > length)
+			copy = length;
+
+		if (!(rt->dst.dev->features&NETIF_F_SG)) {
+			unsigned int off;
+
+			off = skb->len;
+			if (getfrag(from, skb_put(skb, copy),
+						offset, copy, off, skb) < 0) {
+				__skb_trim(skb, off);
+				err = -EFAULT;
+				goto error;
+			}
+		} else {
+			int i = skb_shinfo(skb)->nr_frags;
+			struct page_frag *pfrag = sk_page_frag(sk);
+
+			err = -ENOMEM;
+			if (!sk_page_frag_refill(sk, pfrag))
+				goto error;
+
+			if (!skb_can_coalesce(skb, i, pfrag->page,
+					      pfrag->offset)) {
+				err = -EMSGSIZE;
+				if (i == MAX_SKB_FRAGS)
+					goto error;
+
+				__skb_fill_page_desc(skb, i, pfrag->page,
+						     pfrag->offset, 0);
+				skb_shinfo(skb)->nr_frags = ++i;
+				get_page(pfrag->page);
+			}
+			copy = min_t(int, copy, pfrag->size - pfrag->offset);
+			if (getfrag(from,
+				    page_address(pfrag->page) + pfrag->offset,
+				    offset, copy, skb->len, skb) < 0)
+				goto error_efault;
+
+			pfrag->offset += copy;
+			skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
+			skb->len += copy;
+			skb->data_len += copy;
+			skb->truesize += copy;
+			atomic_add(copy, &sk->sk_wmem_alloc);
+		}
+		offset += copy;
+		length -= copy;
+	}
+
+	return 0;
+
+error_efault:
+	err = -EFAULT;
+error:
+	cork->length -= length;
+	IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
+	return err;
+}
+EXPORT_SYMBOL_GPL(ip6_append_data);
+
+static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np)
+{
+	if (np->cork.opt) {
+		kfree(np->cork.opt->dst0opt);
+		kfree(np->cork.opt->dst1opt);
+		kfree(np->cork.opt->hopopt);
+		kfree(np->cork.opt->srcrt);
+		kfree(np->cork.opt);
+		np->cork.opt = NULL;
+	}
+
+	if (inet->cork.base.dst) {
+		dst_release(inet->cork.base.dst);
+		inet->cork.base.dst = NULL;
+		inet->cork.base.flags &= ~IPCORK_ALLFRAG;
+	}
+	memset(&inet->cork.fl, 0, sizeof(inet->cork.fl));
+}
+
+int ip6_push_pending_frames(struct sock *sk)
+{
+	struct sk_buff *skb, *tmp_skb;
+	struct sk_buff **tail_skb;
+	struct in6_addr final_dst_buf, *final_dst = &final_dst_buf;
+	struct inet_sock *inet = inet_sk(sk);
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct net *net = sock_net(sk);
+	struct ipv6hdr *hdr;
+	struct ipv6_txoptions *opt = np->cork.opt;
+	struct rt6_info *rt = (struct rt6_info *)inet->cork.base.dst;
+	struct flowi6 *fl6 = &inet->cork.fl.u.ip6;
+	unsigned char proto = fl6->flowi6_proto;
+	int err = 0;
+
+	if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL)
+		goto out;
+	tail_skb = &(skb_shinfo(skb)->frag_list);
+
+	/* move skb->data to ip header from ext header */
+	if (skb->data < skb_network_header(skb))
+		__skb_pull(skb, skb_network_offset(skb));
+	while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) {
+		__skb_pull(tmp_skb, skb_network_header_len(skb));
+		*tail_skb = tmp_skb;
+		tail_skb = &(tmp_skb->next);
+		skb->len += tmp_skb->len;
+		skb->data_len += tmp_skb->len;
+		skb->truesize += tmp_skb->truesize;
+		tmp_skb->destructor = NULL;
+		tmp_skb->sk = NULL;
+	}
+
+	/* Allow local fragmentation. */
+	if (np->pmtudisc < IPV6_PMTUDISC_DO)
+		skb->local_df = 1;
+
+	*final_dst = fl6->daddr;
+	__skb_pull(skb, skb_network_header_len(skb));
+	if (opt && opt->opt_flen)
+		ipv6_push_frag_opts(skb, opt, &proto);
+	if (opt && opt->opt_nflen)
+		ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst);
+
+	skb_push(skb, sizeof(struct ipv6hdr));
+	skb_reset_network_header(skb);
+	hdr = ipv6_hdr(skb);
+
+	ip6_flow_hdr(hdr, np->cork.tclass, fl6->flowlabel);
+	hdr->hop_limit = np->cork.hop_limit;
+	hdr->nexthdr = proto;
+	hdr->saddr = fl6->saddr;
+	hdr->daddr = *final_dst;
+
+	skb->priority = sk->sk_priority;
+	skb->mark = sk->sk_mark;
+
+	skb_dst_set(skb, dst_clone(&rt->dst));
+	IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
+	if (proto == IPPROTO_ICMPV6) {
+		struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
+
+		ICMP6MSGOUT_INC_STATS_BH(net, idev, icmp6_hdr(skb)->icmp6_type);
+		ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
+	}
+
+	err = ip6_local_out(skb);
+	if (err) {
+		if (err > 0)
+			err = net_xmit_errno(err);
+		if (err)
+			goto error;
+	}
+
+out:
+	ip6_cork_release(inet, np);
+	return err;
+error:
+	IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
+	goto out;
+}
+EXPORT_SYMBOL_GPL(ip6_push_pending_frames);
+
+void ip6_flush_pending_frames(struct sock *sk)
+{
+	struct sk_buff *skb;
+
+	while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) {
+		if (skb_dst(skb))
+			IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)),
+				      IPSTATS_MIB_OUTDISCARDS);
+		kfree_skb(skb);
+	}
+
+	ip6_cork_release(inet_sk(sk), inet6_sk(sk));
+}
+EXPORT_SYMBOL_GPL(ip6_flush_pending_frames);
diff -Naur linux-3.10.30.org/net/netfilter/core.c linux-3.10.30/net/netfilter/core.c
--- linux-3.10.30.org/net/netfilter/core.c	2014-02-13 22:48:15.000000000 +0100
+++ linux-3.10.30/net/netfilter/core.c	2014-02-14 20:29:05.392738001 +0100
@@ -191,9 +191,11 @@
 		ret = NF_DROP_GETERR(verdict);
 		if (ret == 0)
 			ret = -EPERM;
-	} else if ((verdict & NF_VERDICT_MASK) == NF_QUEUE) {
+	} else if ((verdict & NF_VERDICT_MASK) == NF_QUEUE ||
+		   (verdict & NF_VERDICT_MASK) == NF_IMQ_QUEUE) {
 		int err = nf_queue(skb, elem, pf, hook, indev, outdev, okfn,
-						verdict >> NF_VERDICT_QBITS);
+						verdict >> NF_VERDICT_QBITS,
+						verdict & NF_VERDICT_MASK);
 		if (err < 0) {
 			if (err == -ECANCELED)
 				goto next_hook;
diff -Naur linux-3.10.30.org/net/netfilter/Kconfig linux-3.10.30/net/netfilter/Kconfig
--- linux-3.10.30.org/net/netfilter/Kconfig	2014-02-13 22:48:15.000000000 +0100
+++ linux-3.10.30/net/netfilter/Kconfig	2014-02-14 20:29:05.396071847 +0100
@@ -641,6 +641,18 @@
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+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
diff -Naur linux-3.10.30.org/net/netfilter/Makefile linux-3.10.30/net/netfilter/Makefile
--- linux-3.10.30.org/net/netfilter/Makefile	2014-02-13 22:48:15.000000000 +0100
+++ linux-3.10.30/net/netfilter/Makefile	2014-02-14 20:29:05.396071847 +0100
@@ -82,6 +82,7 @@
 obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_HMARK) += xt_HMARK.o
+obj-$(CONFIG_NETFILTER_XT_TARGET_IMQ) += xt_IMQ.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_LOG) += xt_LOG.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_NETMAP) += xt_NETMAP.o
diff -Naur linux-3.10.30.org/net/netfilter/nf_internals.h linux-3.10.30/net/netfilter/nf_internals.h
--- linux-3.10.30.org/net/netfilter/nf_internals.h	2014-02-13 22:48:15.000000000 +0100
+++ linux-3.10.30/net/netfilter/nf_internals.h	2014-02-14 20:29:05.396071847 +0100
@@ -29,7 +29,7 @@
 		    struct net_device *indev,
 		    struct net_device *outdev,
 		    int (*okfn)(struct sk_buff *),
-		    unsigned int queuenum);
+		    unsigned int queuenum, unsigned int queuetype);
 extern int __init netfilter_queue_init(void);
 
 /* nf_log.c */
diff -Naur linux-3.10.30.org/net/netfilter/nf_queue.c linux-3.10.30/net/netfilter/nf_queue.c
--- linux-3.10.30.org/net/netfilter/nf_queue.c	2014-02-13 22:48:15.000000000 +0100
+++ linux-3.10.30/net/netfilter/nf_queue.c	2014-02-14 20:29:05.396071847 +0100
@@ -27,6 +27,23 @@
  */
 static const struct nf_queue_handler __rcu *queue_handler __read_mostly;
 
+#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
+static const struct nf_queue_handler __rcu *queue_imq_handler __read_mostly;
+
+void nf_register_queue_imq_handler(const struct nf_queue_handler *qh)
+{
+	rcu_assign_pointer(queue_imq_handler, qh);
+}
+EXPORT_SYMBOL_GPL(nf_register_queue_imq_handler);
+
+void nf_unregister_queue_imq_handler(void)
+{
+	RCU_INIT_POINTER(queue_imq_handler, NULL);
+	synchronize_rcu();
+}
+EXPORT_SYMBOL_GPL(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. */
 void nf_register_queue_handler(const struct nf_queue_handler *qh)
@@ -105,7 +122,8 @@
 		      struct net_device *indev,
 		      struct net_device *outdev,
 		      int (*okfn)(struct sk_buff *),
-		      unsigned int queuenum)
+		      unsigned int queuenum,
+		      unsigned int queuetype)
 {
 	int status = -ENOENT;
 	struct nf_queue_entry *entry = NULL;
@@ -115,7 +133,17 @@
 	/* QUEUE == DROP if no one is waiting, to be safe. */
 	rcu_read_lock();
 
-	qh = rcu_dereference(queue_handler);
+	if (queuetype == NF_IMQ_QUEUE) {
+#if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
+		qh = rcu_dereference(queue_imq_handler);
+#else
+		BUG();
+		goto err_unlock;
+#endif
+	} else {
+		qh = rcu_dereference(queue_handler);
+	}
+
 	if (!qh) {
 		status = -ESRCH;
 		goto err_unlock;
@@ -205,9 +233,11 @@
 		local_bh_enable();
 		break;
 	case NF_QUEUE:
+	case NF_IMQ_QUEUE:
 		err = nf_queue(skb, elem, entry->pf, entry->hook,
 				entry->indev, entry->outdev, entry->okfn,
-				verdict >> NF_VERDICT_QBITS);
+				verdict >> NF_VERDICT_QBITS,
+				verdict & NF_VERDICT_MASK);
 		if (err < 0) {
 			if (err == -ECANCELED)
 				goto next_hook;
diff -Naur linux-3.10.30.org/net/netfilter/xt_IMQ.c linux-3.10.30/net/netfilter/xt_IMQ.c
--- linux-3.10.30.org/net/netfilter/xt_IMQ.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-3.10.30/net/netfilter/xt_IMQ.c	2014-02-14 20:29:05.396071847 +0100
@@ -0,0 +1,72 @@
+/*
+ * 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) {
+		pr_warn("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");
+