patch-2.3.99-pre2 linux/net/ipv4/netfilter/ip_queue.c

Next file: linux/net/ipv4/netfilter/ip_tables.c
Previous file: linux/net/ipv4/netfilter/ip_nat_standalone.c
Back to the patch index
Back to the overall index

diff -u --recursive --new-file v2.3.99-pre1/linux/net/ipv4/netfilter/ip_queue.c linux/net/ipv4/netfilter/ip_queue.c
@@ -0,0 +1,752 @@
+/*
+ * This is a module which is used for queueing IPv4 packets and
+ * communicating with userspace via netlink.
+ *
+ * (C) 2000 James Morris
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/ip.h>
+#include <linux/notifier.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter.h>
+#include <linux/netlink.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/rtnetlink.h>
+#include <linux/sysctl.h>
+#include <linux/proc_fs.h>
+#include <net/sock.h>
+
+#include <linux/netfilter_ipv4/ip_queue.h>
+
+EXPORT_NO_SYMBOLS;
+
+#define IPQ_THR_NAME "kipq"
+#define IPQ_NAME "ip_queue"
+#define IPQ_QMAX_DEFAULT 1024
+
+#define IPQ_PROC_FS_NAME "ip_queue"
+
+#define NET_IPQ_QMAX 2088
+#define NET_IPQ_QMAX_NAME "ip_queue_maxlen"
+
+typedef struct ipq_queue_element {
+	struct list_head list;		/* Links element into queue */
+	unsigned char state;		/* State of this element */
+	int verdict;			/* Current verdict */
+	struct nf_info *info;		/* Extra info from netfilter */
+	struct sk_buff *skb;		/* Packet inside */
+} ipq_queue_element_t;
+
+typedef int (*ipq_send_cb_t)(ipq_queue_element_t *e);
+
+typedef struct ipq_peer {
+	pid_t pid;			/* PID of userland peer */
+	unsigned char died;		/* We think the peer died */
+	unsigned char copy_mode;	/* Copy packet as well as metadata? */
+	size_t copy_range;		/* Range past metadata to copy */
+	ipq_send_cb_t send;		/* Callback for sending data to peer */
+} ipq_peer_t;
+
+typedef struct ipq_thread {
+	pid_t pid;			/* PID of kernel thread */
+ 	unsigned char terminate;	/* Termination flag */
+ 	unsigned char running;		/* Running flag */
+ 	wait_queue_head_t wq;		/* I/O wait queue */
+ 	void (*process)(void *data);	/* Queue processing function */
+} ipq_thread_t;
+
+typedef struct ipq_queue {
+ 	int len;			/* Current queue len */
+ 	int *maxlen;			/* Maximum queue len, via sysctl */
+ 	unsigned char state;		/* Current queue state */
+ 	struct list_head list;		/* Head of packet queue */
+ 	spinlock_t lock;		/* Queue spinlock */
+ 	ipq_peer_t peer;		/* Userland peer */
+ 	ipq_thread_t thread;		/* Thread context */
+} ipq_queue_t;
+
+
+/****************************************************************************
+*
+* Kernel thread
+*
+****************************************************************************/
+
+static void ipq_thread_init(char *thread_name)
+{
+ 	lock_kernel();
+ 	exit_files(current);
+ 	daemonize();
+ 	strcpy(current->comm, thread_name);
+ 	unlock_kernel();
+ 	spin_lock_irq(&current->sigmask_lock);
+ 	flush_signals(current);
+ 	sigfillset(&current->blocked);
+ 	recalc_sigpending(current);
+ 	spin_unlock_irq(&current->sigmask_lock);
+}
+
+static int ipq_thread_start(void *data)
+{
+ 	ipq_queue_t *q = (ipq_queue_t *)data;
+
+ 	q->thread.running = 1;
+ 	ipq_thread_init(IPQ_THR_NAME);
+ 	q->thread.pid = current->pid;
+ 	while (!q->thread.terminate) {
+ 		interruptible_sleep_on(&q->thread.wq);
+ 		q->thread.process(q);
+ 	}
+ 	q->thread.running = 0;
+ 	return 0;
+}
+
+static void ipq_thread_stop(ipq_queue_t *q)
+{
+ 	if (!(q->thread.pid || q->thread.running))
+ 		return;
+ 	q->state = IPQ_QS_FLUSH;
+ 	q->thread.terminate = 1;
+ 	wake_up_interruptible(&q->thread.wq);
+ 	current->state = TASK_INTERRUPTIBLE;
+ 	while (q->thread.running) {
+ 		schedule_timeout(HZ/10);
+ 		current->state = TASK_RUNNING;
+ 	}
+}
+
+static int ipq_thread_create(ipq_queue_t *q)
+{
+	int status = kernel_thread(ipq_thread_start, q, 0);
+	return (status < 0) ? status : 0;
+}
+
+
+/****************************************************************************
+ *
+ * Packet queue
+ *
+ ****************************************************************************/
+
+/* Must be called under spinlock */
+static __inline__ void
+ipq_dequeue(ipq_queue_t *q,
+            ipq_queue_element_t *e)
+{
+	list_del(&e->list);
+	nf_reinject(e->skb, e->info, e->verdict);
+	kfree(e);
+	q->len--;
+}
+
+/* Must be called under spinlock */
+static __inline__ void
+ipq_queue_drop(ipq_queue_t *q,
+               ipq_queue_element_t *e)
+{
+	e->verdict = NF_DROP;
+	ipq_dequeue(q, e);
+}
+
+static int
+ipq_notify_peer(ipq_queue_t *q,
+                ipq_queue_element_t *e)
+{
+	int status = q->peer.send(e);
+
+	if (status >= 0) {
+		e->state = IPQ_PS_WAITING;
+		return status;
+	}
+	if (status == -ERESTARTSYS || status == -EAGAIN)
+		return 0;
+	printk(KERN_INFO "%s: error notifying peer %d, resetting "
+	       "state and flushing queue\n", IPQ_NAME, q->peer.pid);
+	q->state = IPQ_QS_FLUSH;
+	q->peer.died = 1;
+	q->peer.pid = 0;
+	q->peer.copy_mode = IPQ_COPY_META;
+	q->peer.copy_range = 0;
+	return status;
+}
+
+static void
+ipq_queue_process(void *data)
+{
+	struct list_head *i;
+	ipq_queue_t *q = (ipq_queue_t *)data;
+
+restart:
+	if (q->state == IPQ_QS_HOLD)
+		return;
+	spin_lock_bh(&q->lock);
+	for (i = q->list.prev; i != &q->list; i = i->prev) {
+		ipq_queue_element_t *e = (ipq_queue_element_t *)i;
+
+		if (q->state == IPQ_QS_FLUSH) {
+			QDEBUG("flushing packet %p\n", e);
+			ipq_queue_drop(q, e);
+			continue;
+		}
+		switch (e->state) {
+			case IPQ_PS_NEW: {
+				int status = ipq_notify_peer(q, e);
+				if (status < 0) {
+					spin_unlock_bh(&q->lock);
+					goto restart;
+				}
+				break;
+			}
+			case IPQ_PS_VERDICT:
+				ipq_dequeue(q, e);
+				break;
+			case IPQ_PS_WAITING:
+				break;
+			default:
+				printk(KERN_INFO "%s: dropping stuck packet %p "
+				       "with ps=%d qs=%d\n", IPQ_NAME,
+				       e, e->state, q->state);
+				ipq_queue_drop(q, e);
+		}
+	}
+	spin_unlock_bh(&q->lock);
+	if (q->state == IPQ_QS_FLUSH)
+		q->state = IPQ_QS_HOLD;
+}
+
+static ipq_queue_t *
+ipq_queue_create(nf_queue_outfn_t outfn,
+                 ipq_send_cb_t send_cb,
+                 int *errp,
+                 int *sysctl_qmax)
+{
+	int status;
+	ipq_queue_t *q;
+
+	*errp = 0;
+	q = kmalloc(sizeof(ipq_queue_t), GFP_KERNEL);
+	if (q == NULL) {
+		*errp = -ENOMEM;
+		return NULL;
+	}
+	q->thread.terminate = 0;
+	q->thread.running = 0;
+	q->thread.process = ipq_queue_process;
+	init_waitqueue_head(&q->thread.wq);
+	q->peer.pid = 0;
+	q->peer.died = 0;
+	q->peer.copy_mode = IPQ_COPY_META;
+	q->peer.copy_range = 0;
+	q->peer.send = send_cb;
+	q->len = 0;
+	q->maxlen = sysctl_qmax;
+	q->state = IPQ_QS_HOLD;
+	INIT_LIST_HEAD(&q->list);
+	spin_lock_init(&q->lock);
+	status = nf_register_queue_handler(PF_INET, outfn, q);
+	if (status < 0) {
+		*errp = -EBUSY;
+		kfree(q);
+		return NULL;
+	}
+	status = ipq_thread_create(q);
+	if (status < 0) {
+		nf_unregister_queue_handler(PF_INET);
+		*errp = status;
+		kfree(q);
+		return  NULL;
+	}
+	return q;
+}
+
+static int
+ipq_enqueue(ipq_queue_t *q,
+            struct sk_buff *skb,
+            struct nf_info *info)
+{
+	ipq_queue_element_t *e = NULL;
+
+	e = kmalloc(sizeof(*e), GFP_ATOMIC);
+	if (e == NULL) {
+		printk(KERN_ERR "%s: out of memory in %s\n",
+		       IPQ_NAME, __FUNCTION__);
+		return  -ENOMEM;
+	}
+	e->state = IPQ_PS_NEW;
+	e->verdict = NF_DROP;
+	e->info = info;
+	e->skb = skb;
+	spin_lock_bh(&q->lock);
+	if (q->len >= *q->maxlen) {
+		spin_unlock_bh(&q->lock);
+		printk(KERN_WARNING "%s: queue full at %d entries, "
+		       "dropping packet.\n", IPQ_NAME, q->len);
+		kfree(e);
+		nf_reinject(skb, info, NF_DROP);
+		return 0;
+	}
+	list_add(&e->list, &q->list);
+	q->len++;
+	spin_unlock_bh(&q->lock);
+	wake_up_interruptible(&q->thread.wq);
+	return 0;
+}
+
+/* FIXME: need to find a way to notify user during module unload */
+static void
+ipq_queue_destroy(ipq_queue_t *q)
+{
+	ipq_thread_stop(q);
+	nf_unregister_queue_handler(PF_INET);
+	kfree(q);
+}
+
+static int
+ipq_queue_mangle_ipv4(unsigned char *buf,
+                      ipq_verdict_msg_t *v,
+                      ipq_queue_element_t *e)
+{
+	struct iphdr *user_iph = (struct iphdr *)buf;
+
+	if (v->data_len < sizeof(*user_iph))
+		return 0;
+
+	if (e->skb->nh.iph->check != user_iph->check) {
+		int diff = v->data_len - e->skb->len;
+
+		if (diff < 0)
+			skb_trim(e->skb, v->data_len);
+		else if (diff > 0) {
+			if (v->data_len > 0xFFFF) {
+				e->verdict = NF_DROP;
+				return -EINVAL;
+			}
+			if (diff > skb_tailroom(e->skb)) {
+				struct sk_buff *newskb;
+
+				/* Ack, we waste a memcpy() of data here */
+				newskb = skb_copy_expand(e->skb,
+				                         skb_headroom(e->skb),
+				                         diff,
+				                         GFP_ATOMIC);
+				if (newskb == NULL) {
+					printk(KERN_WARNING "%s: OOM in %s, "
+					       "dropping packet\n",
+					       IPQ_THR_NAME, __FUNCTION__);
+					e->verdict = NF_DROP;
+					return -ENOMEM;
+				}
+				kfree_skb(e->skb);
+				e->skb = newskb;
+			}
+			skb_put(e->skb, diff);
+		}
+		memcpy(e->skb->data, buf, v->data_len);
+		e->skb->nfcache |= NFC_ALTERED;
+	}
+	return 0;
+}
+
+static int
+ipq_queue_set_verdict(ipq_queue_t *q,
+                      ipq_verdict_msg_t *v,
+                      unsigned char *buf,
+                      unsigned int len)
+{
+	struct list_head *i;
+
+	if (v->value < 0 || v->value > NF_MAX_VERDICT)
+		return -EINVAL;
+	spin_lock_bh(&q->lock);
+	for (i = q->list.next; i != &q->list; i = i->next) {
+		ipq_queue_element_t *e = (ipq_queue_element_t *)i;
+
+		if (v->id == (unsigned long )e) {
+			int status = 0;
+			e->state = IPQ_PS_VERDICT;
+			e->verdict = v->value;
+
+			if (buf && v->data_len == len)
+				status = ipq_queue_mangle_ipv4(buf, v, e);
+			spin_unlock_bh(&q->lock);
+			return status;
+		}
+	}
+	spin_unlock_bh(&q->lock);
+	return -ENOENT;
+}
+
+static int
+ipq_receive_peer(ipq_queue_t *q,
+                 ipq_peer_msg_t *m,
+                 unsigned char type,
+                 unsigned int len)
+{
+	if (q->state == IPQ_QS_FLUSH)
+		return -EBUSY;
+
+	if (len < sizeof(ipq_peer_msg_t))
+		return -EINVAL;
+
+	switch (type) {
+		case IPQM_MODE:
+			switch (m->msg.mode.value) {
+				case IPQ_COPY_NONE:
+					q->peer.copy_mode = IPQ_COPY_NONE;
+					q->peer.copy_range = 0;
+					q->state = IPQ_QS_FLUSH;
+					break;
+				case IPQ_COPY_META:
+					if (q->state == IPQ_QS_FLUSH)
+						return -EAGAIN;
+					q->peer.copy_mode = IPQ_COPY_META;
+					q->peer.copy_range = 0;
+					q->state = IPQ_QS_COPY;
+					break;
+				case IPQ_COPY_PACKET:
+					if (q->state == IPQ_QS_FLUSH)
+						return -EAGAIN;
+					q->peer.copy_mode = IPQ_COPY_PACKET;
+					q->peer.copy_range = m->msg.mode.range;
+					q->state = IPQ_QS_COPY;
+					break;
+				default:
+					return -EINVAL;
+			}
+			break;
+		case IPQM_VERDICT: {
+			int status;
+			unsigned char *data = NULL;
+
+			if (m->msg.verdict.value > NF_MAX_VERDICT)
+				return -EINVAL;
+			if (m->msg.verdict.data_len)
+				data = (unsigned char *)m + sizeof(*m);
+			status = ipq_queue_set_verdict(q, &m->msg.verdict,
+			                               data, len - sizeof(*m));
+			if (status < 0)
+				return status;
+			break;
+		}
+		default:
+			return -EINVAL;
+	}
+	wake_up_interruptible(&q->thread.wq);
+	return 0;
+}
+
+
+/****************************************************************************
+ *
+ * Netfilter interface
+ *
+ ****************************************************************************/
+
+/*
+ * Packets arrive here from netfilter for queuing to userspace.
+ * All of them must be fed back via nf_reinject() or Alexey will kill Rusty.
+ */
+static int
+receive_netfilter(struct sk_buff *skb,
+                  struct nf_info *info,
+                  void *data)
+{
+	ipq_queue_t *q = (ipq_queue_t *)data;
+
+	if (q->state == IPQ_QS_FLUSH)
+		return -EBUSY;
+	return ipq_enqueue(q, skb, info);
+}
+
+/****************************************************************************
+ *
+ * Netlink interface.
+ *
+ ****************************************************************************/
+
+static struct sk_buff *
+netlink_build_message(ipq_queue_element_t *e,
+                      int *errp);
+
+extern __inline__ void
+receive_user_skb(struct sk_buff *skb);
+
+static int
+netlink_send_peer(ipq_queue_element_t *e);
+
+static struct sock *nfnl = NULL;
+ipq_queue_t *nlq = NULL;
+
+static int
+netlink_send_peer(ipq_queue_element_t *e)
+{
+	int status = 0;
+	struct sk_buff *skb;
+
+	if (!nlq->peer.pid)
+		return -EINVAL;
+	skb = netlink_build_message(e, &status);
+	if (skb == NULL)
+		return status;
+	return netlink_unicast(nfnl, skb, nlq->peer.pid, 0);
+}
+
+static struct sk_buff *
+netlink_build_message(ipq_queue_element_t *e,
+                      int *errp)
+{
+	unsigned char *old_tail;
+	size_t size = 0;
+	size_t data_len = 0;
+	struct sk_buff *skb;
+	ipq_packet_msg_t *pm;
+	struct nlmsghdr *nlh;
+
+	switch (nlq->peer.copy_mode) {
+		size_t copy_range;
+
+		case IPQ_COPY_META:
+			size = NLMSG_SPACE(sizeof(*pm));
+			data_len = 0;
+			break;
+		case IPQ_COPY_PACKET:
+			copy_range = nlq->peer.copy_range;
+			if (copy_range == 0 || copy_range > e->skb->len)
+				data_len = e->skb->len;
+			else
+				data_len = copy_range;
+			size = NLMSG_SPACE(sizeof(*pm) + data_len);
+			break;
+		case IPQ_COPY_NONE:
+		default:
+			*errp = -EINVAL;
+			return NULL;
+	}
+	skb = alloc_skb(size, GFP_ATOMIC);
+	if (!skb)
+		goto nlmsg_failure;
+	old_tail = skb->tail;
+	nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh));
+	pm = NLMSG_DATA(nlh);
+	memset(pm, 0, sizeof(*pm));
+	pm->packet_id = (unsigned long )e;
+	pm->data_len = data_len;
+	pm->timestamp_sec = e->skb->stamp.tv_sec;
+	pm->timestamp_usec = e->skb->stamp.tv_usec;
+	pm->hook = e->info->hook;
+	if (e->info->indev) strcpy(pm->indev_name, e->info->indev->name);
+	else pm->indev_name[0] = '\0';
+	if (e->info->outdev) strcpy(pm->outdev_name, e->info->outdev->name);
+	else pm->outdev_name[0] = '\0';
+	if (data_len)
+		memcpy(++pm, e->skb->data, data_len);
+	nlh->nlmsg_len = skb->tail - old_tail;
+	NETLINK_CB(skb).dst_groups = 0;
+	return skb;
+nlmsg_failure:
+	if (skb)
+		kfree(skb);
+	*errp = 0;
+	printk(KERN_ERR "%s: error creating netlink message\n", IPQ_NAME);
+	return NULL;
+}
+
+#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0);
+/*
+ * FIXME: ping old peer if we detect a new peer then resend.
+ */
+extern __inline__ void
+receive_user_skb(struct sk_buff *skb)
+{
+	int status, type;
+	struct nlmsghdr *nlh;
+
+	nlh = (struct nlmsghdr *)skb->data;
+	if (nlh->nlmsg_len < sizeof(*nlh)
+	    || skb->len < nlh->nlmsg_len
+	    || nlh->nlmsg_pid <= 0
+	    || !(nlh->nlmsg_flags & NLM_F_REQUEST)
+	    || nlh->nlmsg_flags & NLM_F_MULTI)
+		RCV_SKB_FAIL(-EINVAL);
+	if (nlh->nlmsg_flags & MSG_TRUNC)
+		RCV_SKB_FAIL(-ECOMM);
+	type = nlh->nlmsg_type;
+	if (type < NLMSG_NOOP || type >= IPQM_MAX)
+		RCV_SKB_FAIL(-EINVAL);
+	if (type <= IPQM_BASE)
+		return;
+	if(!cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN))
+		RCV_SKB_FAIL(-EPERM);
+	if (nlq->peer.pid && !nlq->peer.died
+	    && (nlq->peer.pid != nlh->nlmsg_pid))
+	    	printk(KERN_WARNING "%s: peer pid changed from %d to %d\n",
+	    	       IPQ_NAME, nlq->peer.pid, nlh->nlmsg_pid);
+	nlq->peer.pid = nlh->nlmsg_pid;
+	nlq->peer.died = 0;
+	status = ipq_receive_peer(nlq, NLMSG_DATA(nlh),
+	                          type, skb->len - NLMSG_LENGTH(0));
+	if (status < 0)
+		RCV_SKB_FAIL(status);
+	if (nlh->nlmsg_flags & NLM_F_ACK)
+		netlink_ack(skb, nlh, 0);
+        return;
+}
+
+/* Note: we are only dealing with single part messages at the moment. */
+static void
+receive_user_sk(struct sock *sk,
+                int len)
+{
+	do {
+		struct sk_buff *skb;
+
+		if (rtnl_shlock_nowait())
+			return;
+		while ((skb = skb_dequeue(&sk->receive_queue)) != NULL) {
+			receive_user_skb(skb);
+			kfree_skb(skb);
+		}
+		up(&rtnl_sem);
+	} while (nfnl && nfnl->receive_queue.qlen);
+}
+
+
+/****************************************************************************
+ *
+ * System events
+ *
+ ****************************************************************************/
+
+static int
+receive_event(struct notifier_block *this,
+              unsigned long event,
+              void *ptr)
+{
+	if (event == NETDEV_UNREGISTER)
+		if (nlq)
+			ipq_thread_stop(nlq);
+	return NOTIFY_DONE;
+}
+
+struct notifier_block ipq_dev_notifier = {
+	receive_event,
+	NULL,
+	0
+};
+
+
+/****************************************************************************
+ *
+ * Sysctl - queue tuning.
+ *
+ ****************************************************************************/
+
+static int sysctl_maxlen = IPQ_QMAX_DEFAULT;
+
+static struct ctl_table_header *ipq_sysctl_header;
+
+static ctl_table ipq_table[] = {
+	{ NET_IPQ_QMAX, NET_IPQ_QMAX_NAME, &sysctl_maxlen,
+	  sizeof(sysctl_maxlen), 0644,  NULL, proc_dointvec },
+ 	{ 0 }
+};
+
+static ctl_table ipq_dir_table[] = {
+	{NET_IPV4, "ipv4", NULL, 0, 0555, ipq_table, 0, 0, 0, 0, 0},
+	{ 0 }
+};
+
+static ctl_table ipq_root_table[] = {
+	{CTL_NET, "net", NULL, 0, 0555, ipq_dir_table, 0, 0, 0, 0, 0},
+	{ 0 }
+};
+
+/****************************************************************************
+ *
+ * Procfs - debugging info.
+ *
+ ****************************************************************************/
+
+static int
+ipq_get_info(char *buffer, char **start, off_t offset, int length)
+{
+	int len;
+
+	spin_lock_bh(&nlq->lock);
+	len = sprintf(buffer,
+ 	              "Thread pid        : %d\n"
+ 	              "Thread terminate  : %d\n"
+ 	              "Thread running    : %d\n"
+	              "Peer pid          : %d\n"
+	              "Peer died         : %d\n"
+	              "Peer copy mode    : %d\n"
+	              "Peer copy range   : %d\n"
+	              "Queue length      : %d\n"
+	              "Queue max. length : %d\n"
+	              "Queue state       : %d\n",
+ 	              nlq->thread.pid,
+ 	              nlq->thread.terminate,
+ 	              nlq->thread.running,
+	              nlq->peer.pid,
+	              nlq->peer.died,
+	              nlq->peer.copy_mode,
+	              nlq->peer.copy_range,
+	              nlq->len,
+	              *nlq->maxlen,
+	              nlq->state);
+	spin_unlock_bh(&nlq->lock);
+	*start = buffer + offset;
+	len -= offset;
+	if (len > length)
+		len = length;
+	else if (len < 0)
+		len = 0;
+	return len;
+}
+
+/****************************************************************************
+ *
+ * Module stuff.
+ *
+ ****************************************************************************/
+
+static int __init init(void)
+{
+	int status = 0;
+
+	nfnl = netlink_kernel_create(NETLINK_FIREWALL, receive_user_sk);
+	if (nfnl == NULL) {
+		printk(KERN_ERR "%s: initialisation failed: unable to "
+		       "create kernel netlink socket\n", IPQ_NAME);
+		return -ENOMEM;
+	}
+	nlq = ipq_queue_create(receive_netfilter,
+	                       netlink_send_peer, &status, &sysctl_maxlen);
+	if (nlq == NULL) {
+		printk(KERN_ERR "%s: initialisation failed: unable to "
+		       "initialise queue\n", IPQ_NAME);
+		sock_release(nfnl->socket);
+		return status;
+	}
+	register_netdevice_notifier(&ipq_dev_notifier);
+	proc_net_create(IPQ_PROC_FS_NAME, 0, ipq_get_info);
+	ipq_sysctl_header = register_sysctl_table(ipq_root_table, 0);
+	return status;
+}
+
+static void __exit fini(void)
+{
+	unregister_sysctl_table(ipq_sysctl_header);
+	proc_net_remove(IPQ_PROC_FS_NAME);
+	unregister_netdevice_notifier(&ipq_dev_notifier);
+	ipq_queue_destroy(nlq);
+	sock_release(nfnl->socket);
+}
+
+MODULE_DESCRIPTION("IPv4 packet queue handler");
+module_init(init);
+module_exit(fini);
+
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)