1 files changed, 943 insertions, 0 deletions

diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
new file mode 100644
index 0000000..8c86011
--- /dev/null
+++ b/net/netfilter/nfnetlink_queue.c
@@ -0,0 +1,943 @@
+/*
+ * This is a module which is used for queueing packets and communicating with
+ * userspace via nfetlink.
+ *
+ * (C) 2005 by Harald Welte <laforge@netfilter.org>
+ * (C) 2007 by Patrick McHardy <kaber@trash.net>
+ *
+ * Based on the old ipv4-only ip_queue.c:
+ * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
+ * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/notifier.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter.h>
+#include <linux/proc_fs.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nfnetlink_queue.h>
+#include <linux/list.h>
+#include <net/sock.h>
+#include <net/netfilter/nf_queue.h>
+
+#include <asm/atomic.h>
+
+#ifdef CONFIG_BRIDGE_NETFILTER
+#include "../bridge/br_private.h"
+#endif
+
+#define NFQNL_QMAX_DEFAULT 1024
+
+struct nfqnl_instance {
+	struct hlist_node hlist;		/* global list of queues */
+	struct rcu_head rcu;
+
+	int peer_pid;
+	unsigned int queue_maxlen;
+	unsigned int copy_range;
+	unsigned int queue_total;
+	unsigned int queue_dropped;
+	unsigned int queue_user_dropped;
+
+	unsigned int id_sequence;		/* 'sequence' of pkt ids */
+
+	u_int16_t queue_num;			/* number of this queue */
+	u_int8_t copy_mode;
+
+	spinlock_t lock;
+
+	struct list_head queue_list;		/* packets in queue */
+};
+
+typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
+
+static DEFINE_SPINLOCK(instances_lock);
+
+#define INSTANCE_BUCKETS	16
+static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly;
+
+static inline u_int8_t instance_hashfn(u_int16_t queue_num)
+{
+	return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS;
+}
+
+static struct nfqnl_instance *
+instance_lookup(u_int16_t queue_num)
+{
+	struct hlist_head *head;
+	struct hlist_node *pos;
+	struct nfqnl_instance *inst;
+
+	head = &instance_table[instance_hashfn(queue_num)];
+	hlist_for_each_entry_rcu(inst, pos, head, hlist) {
+		if (inst->queue_num == queue_num)
+			return inst;
+	}
+	return NULL;
+}
+
+static struct nfqnl_instance *
+instance_create(u_int16_t queue_num, int pid)
+{
+	struct nfqnl_instance *inst;
+	unsigned int h;
+	int err;
+
+	spin_lock(&instances_lock);
+	if (instance_lookup(queue_num)) {
+		err = -EEXIST;
+		goto out_unlock;
+	}
+
+	inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
+	if (!inst) {
+		err = -ENOMEM;
+		goto out_unlock;
+	}
+
+	inst->queue_num = queue_num;
+	inst->peer_pid = pid;
+	inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
+	inst->copy_range = 0xfffff;
+	inst->copy_mode = NFQNL_COPY_NONE;
+	spin_lock_init(&inst->lock);
+	INIT_LIST_HEAD(&inst->queue_list);
+	INIT_RCU_HEAD(&inst->rcu);
+
+	if (!try_module_get(THIS_MODULE)) {
+		err = -EAGAIN;
+		goto out_free;
+	}
+
+	h = instance_hashfn(queue_num);
+	hlist_add_head_rcu(&inst->hlist, &instance_table[h]);
+
+	spin_unlock(&instances_lock);
+
+	return inst;
+
+out_free:
+	kfree(inst);
+out_unlock:
+	spin_unlock(&instances_lock);
+	return ERR_PTR(err);
+}
+
+static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
+			unsigned long data);
+
+static void
+instance_destroy_rcu(struct rcu_head *head)
+{
+	struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
+						   rcu);
+
+	nfqnl_flush(inst, NULL, 0);
+	kfree(inst);
+	module_put(THIS_MODULE);
+}
+
+static void
+__instance_destroy(struct nfqnl_instance *inst)
+{
+	hlist_del_rcu(&inst->hlist);
+	call_rcu(&inst->rcu, instance_destroy_rcu);
+}
+
+static void
+instance_destroy(struct nfqnl_instance *inst)
+{
+	spin_lock(&instances_lock);
+	__instance_destroy(inst);
+	spin_unlock(&instances_lock);
+}
+
+static inline void
+__enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
+{
+       list_add_tail(&entry->list, &queue->queue_list);
+       queue->queue_total++;
+}
+
+static struct nf_queue_entry *
+find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
+{
+	struct nf_queue_entry *entry = NULL, *i;
+
+	spin_lock_bh(&queue->lock);
+
+	list_for_each_entry(i, &queue->queue_list, list) {
+		if (i->id == id) {
+			entry = i;
+			break;
+		}
+	}
+
+	if (entry) {
+		list_del(&entry->list);
+		queue->queue_total--;
+	}
+
+	spin_unlock_bh(&queue->lock);
+
+	return entry;
+}
+
+static void
+nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
+{
+	struct nf_queue_entry *entry, *next;
+
+	spin_lock_bh(&queue->lock);
+	list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
+		if (!cmpfn || cmpfn(entry, data)) {
+			list_del(&entry->list);
+			queue->queue_total--;
+			nf_reinject(entry, NF_DROP);
+		}
+	}
+	spin_unlock_bh(&queue->lock);
+}
+
+static struct sk_buff *
+nfqnl_build_packet_message(struct nfqnl_instance *queue,
+			   struct nf_queue_entry *entry)
+{
+	sk_buff_data_t old_tail;
+	size_t size;
+	size_t data_len = 0;
+	struct sk_buff *skb;
+	struct nfqnl_msg_packet_hdr pmsg;
+	struct nlmsghdr *nlh;
+	struct nfgenmsg *nfmsg;
+	struct sk_buff *entskb = entry->skb;
+	struct net_device *indev;
+	struct net_device *outdev;
+
+	size =    NLMSG_SPACE(sizeof(struct nfgenmsg))
+		+ nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
+		+ nla_total_size(sizeof(u_int32_t))	/* ifindex */
+		+ nla_total_size(sizeof(u_int32_t))	/* ifindex */
+#ifdef CONFIG_BRIDGE_NETFILTER
+		+ nla_total_size(sizeof(u_int32_t))	/* ifindex */
+		+ nla_total_size(sizeof(u_int32_t))	/* ifindex */
+#endif
+		+ nla_total_size(sizeof(u_int32_t))	/* mark */
+		+ nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
+		+ nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
+
+	outdev = entry->outdev;
+
+	spin_lock_bh(&queue->lock);
+
+	switch ((enum nfqnl_config_mode)queue->copy_mode) {
+	case NFQNL_COPY_META:
+	case NFQNL_COPY_NONE:
+		break;
+
+	case NFQNL_COPY_PACKET:
+		if ((entskb->ip_summed == CHECKSUM_PARTIAL ||
+		     entskb->ip_summed == CHECKSUM_COMPLETE) &&
+		    skb_checksum_help(entskb)) {
+			spin_unlock_bh(&queue->lock);
+			return NULL;
+		}
+		if (queue->copy_range == 0
+		    || queue->copy_range > entskb->len)
+			data_len = entskb->len;
+		else
+			data_len = queue->copy_range;
+
+		size += nla_total_size(data_len);
+		break;
+	}
+
+	entry->id = queue->id_sequence++;
+
+	spin_unlock_bh(&queue->lock);
+
+	skb = alloc_skb(size, GFP_ATOMIC);
+	if (!skb)
+		goto nlmsg_failure;
+
+	old_tail = skb->tail;
+	nlh = NLMSG_PUT(skb, 0, 0,
+			NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
+			sizeof(struct nfgenmsg));
+	nfmsg = NLMSG_DATA(nlh);
+	nfmsg->nfgen_family = entry->pf;
+	nfmsg->version = NFNETLINK_V0;
+	nfmsg->res_id = htons(queue->queue_num);
+
+	pmsg.packet_id 		= htonl(entry->id);
+	pmsg.hw_protocol	= entskb->protocol;
+	pmsg.hook		= entry->hook;
+
+	NLA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg);
+
+	indev = entry->indev;
+	if (indev) {
+#ifndef CONFIG_BRIDGE_NETFILTER
+		NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex));
+#else
+		if (entry->pf == PF_BRIDGE) {
+			/* Case 1: indev is physical input device, we need to
+			 * look for bridge group (when called from
+			 * netfilter_bridge) */
+			NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV,
+				     htonl(indev->ifindex));
+			/* this is the bridge group "brX" */
+			NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV,
+				     htonl(indev->br_port->br->dev->ifindex));
+		} else {
+			/* Case 2: indev is bridge group, we need to look for
+			 * physical device (when called from ipv4) */
+			NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV,
+				     htonl(indev->ifindex));
+			if (entskb->nf_bridge && entskb->nf_bridge->physindev)
+				NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV,
+					     htonl(entskb->nf_bridge->physindev->ifindex));
+		}
+#endif
+	}
+
+	if (outdev) {
+#ifndef CONFIG_BRIDGE_NETFILTER
+		NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex));
+#else
+		if (entry->pf == PF_BRIDGE) {
+			/* Case 1: outdev is physical output device, we need to
+			 * look for bridge group (when called from
+			 * netfilter_bridge) */
+			NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV,
+				     htonl(outdev->ifindex));
+			/* this is the bridge group "brX" */
+			NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV,
+				     htonl(outdev->br_port->br->dev->ifindex));
+		} else {
+			/* Case 2: outdev is bridge group, we need to look for
+			 * physical output device (when called from ipv4) */
+			NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV,
+				     htonl(outdev->ifindex));
+			if (entskb->nf_bridge && entskb->nf_bridge->physoutdev)
+				NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV,
+					     htonl(entskb->nf_bridge->physoutdev->ifindex));
+		}
+#endif
+	}
+
+	if (entskb->mark)
+		NLA_PUT_BE32(skb, NFQA_MARK, htonl(entskb->mark));
+
+	if (indev && entskb->dev) {
+		struct nfqnl_msg_packet_hw phw;
+		int len = dev_parse_header(entskb, phw.hw_addr);
+		if (len) {
+			phw.hw_addrlen = htons(len);
+			NLA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw);
+		}
+	}
+
+	if (entskb->tstamp.tv64) {
+		struct nfqnl_msg_packet_timestamp ts;
+		struct timeval tv = ktime_to_timeval(entskb->tstamp);
+		ts.sec = cpu_to_be64(tv.tv_sec);
+		ts.usec = cpu_to_be64(tv.tv_usec);
+
+		NLA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts);
+	}
+
+	if (data_len) {
+		struct nlattr *nla;
+		int sz = nla_attr_size(data_len);
+
+		if (skb_tailroom(skb) < nla_total_size(data_len)) {
+			printk(KERN_WARNING "nf_queue: no tailroom!\n");
+			goto nlmsg_failure;
+		}
+
+		nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len));
+		nla->nla_type = NFQA_PAYLOAD;
+		nla->nla_len = sz;
+
+		if (skb_copy_bits(entskb, 0, nla_data(nla), data_len))
+			BUG();
+	}
+
+	nlh->nlmsg_len = skb->tail - old_tail;
+	return skb;
+
+nlmsg_failure:
+nla_put_failure:
+	if (skb)
+		kfree_skb(skb);
+	if (net_ratelimit())
+		printk(KERN_ERR "nf_queue: error creating packet message\n");
+	return NULL;
+}
+
+static int
+nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
+{
+	struct sk_buff *nskb;
+	struct nfqnl_instance *queue;
+	int err;
+
+	/* rcu_read_lock()ed by nf_hook_slow() */
+	queue = instance_lookup(queuenum);
+	if (!queue)
+		goto err_out;
+
+	if (queue->copy_mode == NFQNL_COPY_NONE)
+		goto err_out;
+
+	nskb = nfqnl_build_packet_message(queue, entry);
+	if (nskb == NULL)
+		goto err_out;
+
+	spin_lock_bh(&queue->lock);
+
+	if (!queue->peer_pid)
+		goto err_out_free_nskb;
+
+	if (queue->queue_total >= queue->queue_maxlen) {
+		queue->queue_dropped++;
+		if (net_ratelimit())
+			  printk(KERN_WARNING "nf_queue: full at %d entries, "
+				 "dropping packets(s). Dropped: %d\n",
+				 queue->queue_total, queue->queue_dropped);
+		goto err_out_free_nskb;
+	}
+
+	/* nfnetlink_unicast will either free the nskb or add it to a socket */
+	err = nfnetlink_unicast(nskb, queue->peer_pid, MSG_DONTWAIT);
+	if (err < 0) {
+		queue->queue_user_dropped++;
+		goto err_out_unlock;
+	}
+
+	__enqueue_entry(queue, entry);
+
+	spin_unlock_bh(&queue->lock);
+	return 0;
+
+err_out_free_nskb:
+	kfree_skb(nskb);
+err_out_unlock:
+	spin_unlock_bh(&queue->lock);
+err_out:
+	return -1;
+}
+
+static int
+nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e)
+{
+	struct sk_buff *nskb;
+	int diff;
+
+	diff = data_len - e->skb->len;
+	if (diff < 0) {
+		if (pskb_trim(e->skb, data_len))
+			return -ENOMEM;
+	} else if (diff > 0) {
+		if (data_len > 0xFFFF)
+			return -EINVAL;
+		if (diff > skb_tailroom(e->skb)) {
+			nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
+					       diff, GFP_ATOMIC);
+			if (!nskb) {
+				printk(KERN_WARNING "nf_queue: OOM "
+				      "in mangle, dropping packet\n");
+				return -ENOMEM;
+			}
+			kfree_skb(e->skb);
+			e->skb = nskb;
+		}
+		skb_put(e->skb, diff);
+	}
+	if (!skb_make_writable(e->skb, data_len))
+		return -ENOMEM;
+	skb_copy_to_linear_data(e->skb, data, data_len);
+	e->skb->ip_summed = CHECKSUM_NONE;
+	return 0;
+}
+
+static int
+nfqnl_set_mode(struct nfqnl_instance *queue,
+	       unsigned char mode, unsigned int range)
+{
+	int status = 0;
+
+	spin_lock_bh(&queue->lock);
+	switch (mode) {
+	case NFQNL_COPY_NONE:
+	case NFQNL_COPY_META:
+		queue->copy_mode = mode;
+		queue->copy_range = 0;
+		break;
+
+	case NFQNL_COPY_PACKET:
+		queue->copy_mode = mode;
+		/* we're using struct nlattr which has 16bit nla_len */
+		if (range > 0xffff)
+			queue->copy_range = 0xffff;
+		else
+			queue->copy_range = range;
+		break;
+
+	default:
+		status = -EINVAL;
+
+	}
+	spin_unlock_bh(&queue->lock);
+
+	return status;
+}
+
+static int
+dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
+{
+	if (entry->indev)
+		if (entry->indev->ifindex == ifindex)
+			return 1;
+	if (entry->outdev)
+		if (entry->outdev->ifindex == ifindex)
+			return 1;
+#ifdef CONFIG_BRIDGE_NETFILTER
+	if (entry->skb->nf_bridge) {
+		if (entry->skb->nf_bridge->physindev &&
+		    entry->skb->nf_bridge->physindev->ifindex == ifindex)
+			return 1;
+		if (entry->skb->nf_bridge->physoutdev &&
+		    entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
+			return 1;
+	}
+#endif
+	return 0;
+}
+
+/* drop all packets with either indev or outdev == ifindex from all queue
+ * instances */
+static void
+nfqnl_dev_drop(int ifindex)
+{
+	int i;
+
+	rcu_read_lock();
+
+	for (i = 0; i < INSTANCE_BUCKETS; i++) {
+		struct hlist_node *tmp;
+		struct nfqnl_instance *inst;
+		struct hlist_head *head = &instance_table[i];
+
+		hlist_for_each_entry_rcu(inst, tmp, head, hlist)
+			nfqnl_flush(inst, dev_cmp, ifindex);
+	}
+
+	rcu_read_unlock();
+}
+
+#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
+
+static int
+nfqnl_rcv_dev_event(struct notifier_block *this,
+		    unsigned long event, void *ptr)
+{
+	struct net_device *dev = ptr;
+
+	if (!net_eq(dev_net(dev), &init_net))
+		return NOTIFY_DONE;
+
+	/* Drop any packets associated with the downed device */
+	if (event == NETDEV_DOWN)
+		nfqnl_dev_drop(dev->ifindex);
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block nfqnl_dev_notifier = {
+	.notifier_call	= nfqnl_rcv_dev_event,
+};
+
+static int
+nfqnl_rcv_nl_event(struct notifier_block *this,
+		   unsigned long event, void *ptr)
+{
+	struct netlink_notify *n = ptr;
+
+	if (event == NETLINK_URELEASE &&
+	    n->protocol == NETLINK_NETFILTER && n->pid) {
+		int i;
+
+		/* destroy all instances for this pid */
+		spin_lock(&instances_lock);
+		for (i = 0; i < INSTANCE_BUCKETS; i++) {
+			struct hlist_node *tmp, *t2;
+			struct nfqnl_instance *inst;
+			struct hlist_head *head = &instance_table[i];
+
+			hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
+				if ((n->net == &init_net) &&
+				    (n->pid == inst->peer_pid))
+					__instance_destroy(inst);
+			}
+		}
+		spin_unlock(&instances_lock);
+	}
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block nfqnl_rtnl_notifier = {
+	.notifier_call	= nfqnl_rcv_nl_event,
+};
+
+static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
+	[NFQA_VERDICT_HDR]	= { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
+	[NFQA_MARK]		= { .type = NLA_U32 },
+	[NFQA_PAYLOAD]		= { .type = NLA_UNSPEC },
+};
+
+static int
+nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
+		   struct nlmsghdr *nlh, struct nlattr *nfqa[])
+{
+	struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
+	u_int16_t queue_num = ntohs(nfmsg->res_id);
+
+	struct nfqnl_msg_verdict_hdr *vhdr;
+	struct nfqnl_instance *queue;
+	unsigned int verdict;
+	struct nf_queue_entry *entry;
+	int err;
+
+	rcu_read_lock();
+	queue = instance_lookup(queue_num);
+	if (!queue) {
+		err = -ENODEV;
+		goto err_out_unlock;
+	}
+
+	if (queue->peer_pid != NETLINK_CB(skb).pid) {
+		err = -EPERM;
+		goto err_out_unlock;
+	}
+
+	if (!nfqa[NFQA_VERDICT_HDR]) {
+		err = -EINVAL;
+		goto err_out_unlock;
+	}
+
+	vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
+	verdict = ntohl(vhdr->verdict);
+
+	if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) {
+		err = -EINVAL;
+		goto err_out_unlock;
+	}
+
+	entry = find_dequeue_entry(queue, ntohl(vhdr->id));
+	if (entry == NULL) {
+		err = -ENOENT;
+		goto err_out_unlock;
+	}
+	rcu_read_unlock();
+
+	if (nfqa[NFQA_PAYLOAD]) {
+		if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
+				 nla_len(nfqa[NFQA_PAYLOAD]), entry) < 0)
+			verdict = NF_DROP;
+	}
+
+	if (nfqa[NFQA_MARK])
+		entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
+
+	nf_reinject(entry, verdict);
+	return 0;
+
+err_out_unlock:
+	rcu_read_unlock();
+	return err;
+}
+
+static int
+nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
+		  struct nlmsghdr *nlh, struct nlattr *nfqa[])
+{
+	return -ENOTSUPP;
+}
+
+static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
+	[NFQA_CFG_CMD]		= { .len = sizeof(struct nfqnl_msg_config_cmd) },
+	[NFQA_CFG_PARAMS]	= { .len = sizeof(struct nfqnl_msg_config_params) },
+};
+
+static const struct nf_queue_handler nfqh = {
+	.name 	= "nf_queue",
+	.outfn	= &nfqnl_enqueue_packet,
+};
+
+static int
+nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
+		  struct nlmsghdr *nlh, struct nlattr *nfqa[])
+{
+	struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
+	u_int16_t queue_num = ntohs(nfmsg->res_id);
+	struct nfqnl_instance *queue;
+	struct nfqnl_msg_config_cmd *cmd = NULL;
+	int ret = 0;
+
+	if (nfqa[NFQA_CFG_CMD]) {
+		cmd = nla_data(nfqa[NFQA_CFG_CMD]);
+
+		/* Commands without queue context - might sleep */
+		switch (cmd->command) {
+		case NFQNL_CFG_CMD_PF_BIND:
+			return nf_register_queue_handler(ntohs(cmd->pf),
+							 &nfqh);
+		case NFQNL_CFG_CMD_PF_UNBIND:
+			return nf_unregister_queue_handler(ntohs(cmd->pf),
+							   &nfqh);
+		}
+	}
+
+	rcu_read_lock();
+	queue = instance_lookup(queue_num);
+	if (queue && queue->peer_pid != NETLINK_CB(skb).pid) {
+		ret = -EPERM;
+		goto err_out_unlock;
+	}
+
+	if (cmd != NULL) {
+		switch (cmd->command) {
+		case NFQNL_CFG_CMD_BIND:
+			if (queue) {
+				ret = -EBUSY;
+				goto err_out_unlock;
+			}
+			queue = instance_create(queue_num, NETLINK_CB(skb).pid);
+			if (IS_ERR(queue)) {
+				ret = PTR_ERR(queue);
+				goto err_out_unlock;
+			}
+			break;
+		case NFQNL_CFG_CMD_UNBIND:
+			if (!queue) {
+				ret = -ENODEV;
+				goto err_out_unlock;
+			}
+			instance_destroy(queue);
+			break;
+		case NFQNL_CFG_CMD_PF_BIND:
+		case NFQNL_CFG_CMD_PF_UNBIND:
+			break;
+		default:
+			ret = -ENOTSUPP;
+			break;
+		}
+	}
+
+	if (nfqa[NFQA_CFG_PARAMS]) {
+		struct nfqnl_msg_config_params *params;
+
+		if (!queue) {
+			ret = -ENODEV;
+			goto err_out_unlock;
+		}
+		params = nla_data(nfqa[NFQA_CFG_PARAMS]);
+		nfqnl_set_mode(queue, params->copy_mode,
+				ntohl(params->copy_range));
+	}
+
+	if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
+		__be32 *queue_maxlen;
+
+		if (!queue) {
+			ret = -ENODEV;
+			goto err_out_unlock;
+		}
+		queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
+		spin_lock_bh(&queue->lock);
+		queue->queue_maxlen = ntohl(*queue_maxlen);
+		spin_unlock_bh(&queue->lock);
+	}
+
+err_out_unlock:
+	rcu_read_unlock();
+	return ret;
+}
+
+static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
+	[NFQNL_MSG_PACKET]	= { .call = nfqnl_recv_unsupp,
+				    .attr_count = NFQA_MAX, },
+	[NFQNL_MSG_VERDICT]	= { .call = nfqnl_recv_verdict,
+				    .attr_count = NFQA_MAX,
+				    .policy = nfqa_verdict_policy },
+	[NFQNL_MSG_CONFIG]	= { .call = nfqnl_recv_config,
+				    .attr_count = NFQA_CFG_MAX,
+				    .policy = nfqa_cfg_policy },
+};
+
+static const struct nfnetlink_subsystem nfqnl_subsys = {
+	.name		= "nf_queue",
+	.subsys_id	= NFNL_SUBSYS_QUEUE,
+	.cb_count	= NFQNL_MSG_MAX,
+	.cb		= nfqnl_cb,
+};
+
+#ifdef CONFIG_PROC_FS
+struct iter_state {
+	unsigned int bucket;
+};
+
+static struct hlist_node *get_first(struct seq_file *seq)
+{
+	struct iter_state *st = seq->private;
+
+	if (!st)
+		return NULL;
+
+	for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
+		if (!hlist_empty(&instance_table[st->bucket]))
+			return instance_table[st->bucket].first;
+	}
+	return NULL;
+}
+
+static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
+{
+	struct iter_state *st = seq->private;
+
+	h = h->next;
+	while (!h) {
+		if (++st->bucket >= INSTANCE_BUCKETS)
+			return NULL;
+
+		h = instance_table[st->bucket].first;
+	}
+	return h;
+}
+
+static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
+{
+	struct hlist_node *head;
+	head = get_first(seq);
+
+	if (head)
+		while (pos && (head = get_next(seq, head)))
+			pos--;
+	return pos ? NULL : head;
+}
+
+static void *seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(instances_lock)
+{
+	spin_lock(&instances_lock);
+	return get_idx(seq, *pos);
+}
+
+static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	(*pos)++;
+	return get_next(s, v);
+}
+
+static void seq_stop(struct seq_file *s, void *v)
+	__releases(instances_lock)
+{
+	spin_unlock(&instances_lock);
+}
+
+static int seq_show(struct seq_file *s, void *v)
+{
+	const struct nfqnl_instance *inst = v;
+
+	return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
+			  inst->queue_num,
+			  inst->peer_pid, inst->queue_total,
+			  inst->copy_mode, inst->copy_range,
+			  inst->queue_dropped, inst->queue_user_dropped,
+			  inst->id_sequence, 1);
+}
+
+static const struct seq_operations nfqnl_seq_ops = {
+	.start	= seq_start,
+	.next	= seq_next,
+	.stop	= seq_stop,
+	.show	= seq_show,
+};
+
+static int nfqnl_open(struct inode *inode, struct file *file)
+{
+	return seq_open_private(file, &nfqnl_seq_ops,
+			sizeof(struct iter_state));
+}
+
+static const struct file_operations nfqnl_file_ops = {
+	.owner	 = THIS_MODULE,
+	.open	 = nfqnl_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = seq_release_private,
+};
+
+#endif /* PROC_FS */
+
+static int __init nfnetlink_queue_init(void)
+{
+	int i, status = -ENOMEM;
+
+	for (i = 0; i < INSTANCE_BUCKETS; i++)
+		INIT_HLIST_HEAD(&instance_table[i]);
+
+	netlink_register_notifier(&nfqnl_rtnl_notifier);
+	status = nfnetlink_subsys_register(&nfqnl_subsys);
+	if (status < 0) {
+		printk(KERN_ERR "nf_queue: failed to create netlink socket\n");
+		goto cleanup_netlink_notifier;
+	}
+
+#ifdef CONFIG_PROC_FS
+	if (!proc_create("nfnetlink_queue", 0440,
+			 proc_net_netfilter, &nfqnl_file_ops))
+		goto cleanup_subsys;
+#endif
+
+	register_netdevice_notifier(&nfqnl_dev_notifier);
+	return status;
+
+#ifdef CONFIG_PROC_FS
+cleanup_subsys:
+	nfnetlink_subsys_unregister(&nfqnl_subsys);
+#endif
+cleanup_netlink_notifier:
+	netlink_unregister_notifier(&nfqnl_rtnl_notifier);
+	return status;
+}
+
+static void __exit nfnetlink_queue_fini(void)
+{
+	nf_unregister_queue_handlers(&nfqh);
+	unregister_netdevice_notifier(&nfqnl_dev_notifier);
+#ifdef CONFIG_PROC_FS
+	remove_proc_entry("nfnetlink_queue", proc_net_netfilter);
+#endif
+	nfnetlink_subsys_unregister(&nfqnl_subsys);
+	netlink_unregister_notifier(&nfqnl_rtnl_notifier);
+}
+
+MODULE_DESCRIPTION("netfilter packet queue handler");
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
+
+module_init(nfnetlink_queue_init);
+module_exit(nfnetlink_queue_fini);