diff -uNr linux-2.6.11/net/ipv4/netfilter/Kconfig linux-2.6.11-work/net/ipv4/netfilter/Kconfig
--- linux-2.6.11/net/ipv4/netfilter/Kconfig	2005-03-12 16:48:12.000000000 +0100
+++ linux-2.6.11-work/net/ipv4/netfilter/Kconfig	2005-03-09 21:11:14.000000000 +0100
@@ -99,6 +99,12 @@
 
 	  To compile it as a module, choose M here.  If unsure, say Y.
 
+config IP_NF_CT_FLUSH
+	tristate "Conntrack userspace flush"
+	depends on IP_NF_CONNTRACK
+	help
+	  To compile it as a module, choose M here.  If unsure, say N.
+
 config IP_NF_QUEUE
 	tristate "Userspace queueing via NETLINK"
 	help
diff -uNr linux-2.6.11/net/ipv4/netfilter/Makefile linux-2.6.11-work/net/ipv4/netfilter/Makefile
--- linux-2.6.11/net/ipv4/netfilter/Makefile	2005-03-12 16:48:21.000000000 +0100
+++ linux-2.6.11-work/net/ipv4/netfilter/Makefile	2005-03-09 21:18:03.000000000 +0100
@@ -88,3 +88,5 @@
 obj-$(CONFIG_IP_NF_ARPFILTER) += arptable_filter.o
 
 obj-$(CONFIG_IP_NF_QUEUE) += ip_queue.o
+
+obj-$(CONFIG_IP_NF_CT_FLUSH) += ct_flush.o
diff -uNr linux-2.6.11/net/ipv4/netfilter/ct_flush.c linux-2.6.11-work/net/ipv4/netfilter/ct_flush.c
--- linux-2.6.11/net/ipv4/netfilter/ct_flush.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.11-work/net/ipv4/netfilter/ct_flush.c	2005-03-12 13:56:25.000000000 +0100
@@ -0,0 +1,118 @@
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/ip.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/module.h>
+#include <net/checksum.h>
+#include <net/ip.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
+
+#include "ct_flush.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Olaf Rempel <razzor@kopf-tisch.de>");
+MODULE_DESCRIPTION("connection tracking flush module");
+
+//#define DEBUG
+
+static int ct_flush_match_real(struct ip_conntrack_tuple *tp, struct search_pattern *pat) {
+	/* compare proto only if one is given */
+	if (pat->proto != 0 && tp->dst.protonum != pat->proto)
+		return 0;
+
+	/* compare src-ip */
+	if ((tp->src.ip ^ pat->src.ip) & pat->src.mask)
+		return 0;
+
+	/* compare dst-ip */
+	if ((tp->dst.ip ^ pat->dst.ip) & pat->dst.mask)
+		return 0;
+
+	/* check ports only if tcp/udp */
+	if (pat->proto != IPPROTO_TCP && pat->proto != IPPROTO_UDP)
+		return 1;
+
+	/* compare src-portrange */
+	if (tp->src.u.all < pat->src.portlo || tp->src.u.all > pat->src.porthi)
+		return 0;
+
+	/* compare dst-portrange */
+	if (tp->dst.u.all < pat->dst.portlo || tp->dst.u.all > pat->dst.porthi)
+		return 0;
+
+	return 1;
+}
+
+static int ct_flush_match(struct ip_conntrack *ct, void *data) {
+	if (ct_flush_match_real(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, data) ||
+	    ct_flush_match_real(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, data)) {
+		((struct search_pattern *)data)->count++;
+		return 1;
+	}
+	return 0;
+}
+
+static int ct_flush_open(struct inode *inode, struct file *file) {
+	return 0;
+}
+
+static int ct_flush_close(struct inode *inode, struct file *file) {
+	return 0;
+}
+
+static int ct_flush_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) {
+	struct search_pattern pat;
+	int ret = 0;
+
+	switch (cmd) {
+	case IOCTL_CT_FLUSH:
+		if (copy_from_user(&pat, (struct search_pattern *)arg, sizeof(pat)))
+			return -EFAULT;
+
+		ip_ct_iterate_cleanup(ct_flush_match, &pat);
+#ifdef DEBUG
+		printk(KERN_DEBUG "ct_flush: proto: %u  src: %u.%u.%u.%u/%u.%u.%u.%u %u:%u  dst: %u.%u.%u.%u/%u.%u.%u.%u %u:%u  found: %u\n",
+			pat.proto,
+			NIPQUAD(pat.src.ip), NIPQUAD(pat.src.mask), ntohs(pat.src.portlo), ntohs(pat.src.porthi),
+			NIPQUAD(pat.dst.ip), NIPQUAD(pat.dst.mask), ntohs(pat.dst.portlo), ntohs(pat.dst.porthi),
+			pat.count);
+#endif
+		if (copy_to_user((void *)arg, &pat, sizeof(pat)))
+			return -EFAULT;
+		break;
+	}
+	return ret;
+}
+
+static struct file_operations ct_flush_fops =
+{
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.ioctl		= ct_flush_ioctl,
+	.open		= ct_flush_open,
+	.release	= ct_flush_close,
+};
+
+static struct miscdevice ct_flush_miscdev =
+{
+	.minor		= CT_FLUSH_MINOR,
+	.name		= "ct_flush",
+	.fops		= &ct_flush_fops,
+};
+
+static int __init init(void) {
+	misc_register(&ct_flush_miscdev);
+	return 0;
+}
+
+static void __exit fini(void) {
+	misc_deregister(&ct_flush_miscdev);
+}
+
+module_init(init);
+module_exit(fini);
diff -uNr linux-2.6.11/net/ipv4/netfilter/ct_flush.h linux-2.6.11-work/net/ipv4/netfilter/ct_flush.h
--- linux-2.6.11/net/ipv4/netfilter/ct_flush.h	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.11-work/net/ipv4/netfilter/ct_flush.h	2005-03-12 14:29:47.000000000 +0100
@@ -0,0 +1,18 @@
+#ifndef _IP_CT_FLUSH_H
+#define _IP_CT_FLUSH_H
+
+struct search_pattern {
+	struct {
+		u_int32_t ip;
+		u_int32_t mask;
+		u_int16_t portlo;
+		u_int16_t porthi;
+	} src, dst;
+	u_int8_t proto;
+	u_int32_t count;
+};
+
+#define CT_FLUSH_MINOR 243
+#define IOCTL_CT_FLUSH _IOWR('W', 0, struct search_pattern)
+
+#endif