Index: linux-2.4.35.4/Documentation/Configure.help
===================================================================
--- linux-2.4.35.4.orig/Documentation/Configure.help
+++ linux-2.4.35.4/Documentation/Configure.help
@@ -2914,6 +2914,15 @@ CONFIG_IP_NF_MATCH_MAC
   If you want to compile it as a module, say M here and read
   <file:Documentation/modules.txt>.  If unsure, say `N'.
 
+Random match support
+CONFIG_IP_NF_MATCH_RANDOM
+  This option adds a `random' match,
+  which allow you to match packets randomly
+  following a given probability.
+ 
+  If you want to compile it as a module, say M here and read
+  Documentation/modules.txt.  If unsure, say `N'.
+
 Netfilter MARK match support
 CONFIG_IP_NF_MATCH_MARK
   Netfilter mark matching allows you to match packets based on the
@@ -3229,6 +3238,7 @@ CONFIG_IP_NF_MATCH_HELPER
   If you want to compile it as a module, say M here and read
   Documentation/modules.txt.  If unsure, say `Y'.
 
+
 TCPMSS match support
 CONFIG_IP_NF_MATCH_TCPMSS
   This option adds a `tcpmss' match, which allows you to examine the
@@ -3376,6 +3386,14 @@ CONFIG_IP6_NF_MATCH_MAC
   If you want to compile it as a module, say M here and read
   <file:Documentation/modules.txt>.  If unsure, say `N'.
 
+CONFIG_IP6_NF_MATCH_RANDOM
+  This option adds a `random' match,
+  which allow you to match packets randomly
+  following a given probability.
+ 
+  If you want to compile it as a module, say M here and read
+  Documentation/modules.txt.  If unsure, say `N'.
+
 length match support
 CONFIG_IP6_NF_MATCH_LENGTH
   This option allows you to match the length of a packet against a
Index: linux-2.4.35.4/include/linux/netfilter_ipv4/ipt_random.h
===================================================================
--- /dev/null
+++ linux-2.4.35.4/include/linux/netfilter_ipv4/ipt_random.h
@@ -0,0 +1,11 @@
+#ifndef _IPT_RAND_H
+#define _IPT_RAND_H
+
+#include <linux/param.h>
+#include <linux/types.h>
+
+struct ipt_rand_info {
+	u_int8_t average;
+};
+
+#endif /*_IPT_RAND_H*/
Index: linux-2.4.35.4/include/linux/netfilter_ipv6/ip6t_random.h
===================================================================
--- /dev/null
+++ linux-2.4.35.4/include/linux/netfilter_ipv6/ip6t_random.h
@@ -0,0 +1,11 @@
+#ifndef _IP6T_RAND_H
+#define _IP6T_RAND_H
+
+#include <linux/param.h>
+#include <linux/types.h>
+
+struct ip6t_rand_info {
+	u_int8_t average;
+};
+
+#endif /*_IP6T_RAND_H*/
Index: linux-2.4.35.4/net/ipv4/netfilter/Config.in
===================================================================
--- linux-2.4.35.4.orig/net/ipv4/netfilter/Config.in
+++ linux-2.4.35.4/net/ipv4/netfilter/Config.in
@@ -48,6 +48,7 @@ if [ "$CONFIG_IP_NF_IPTABLES" != "n" ]; 
   dep_tristate '  netfilter MARK match support' CONFIG_IP_NF_MATCH_MARK $CONFIG_IP_NF_IPTABLES
   dep_tristate '  Multiple port match support' CONFIG_IP_NF_MATCH_MULTIPORT $CONFIG_IP_NF_IPTABLES
   dep_tristate '  TOS match support' CONFIG_IP_NF_MATCH_TOS $CONFIG_IP_NF_IPTABLES
+  dep_tristate '  random match support' CONFIG_IP_NF_MATCH_RANDOM $CONFIG_IP_NF_IPTABLES
   dep_tristate '  TIME match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_TIME $CONFIG_IP_NF_IPTABLES
   dep_tristate '  condition match support' CONFIG_IP_NF_MATCH_CONDITION $CONFIG_IP_NF_IPTABLES
   dep_tristate '  recent match support' CONFIG_IP_NF_MATCH_RECENT $CONFIG_IP_NF_IPTABLES
Index: linux-2.4.35.4/net/ipv4/netfilter/ipt_random.c
===================================================================
--- /dev/null
+++ linux-2.4.35.4/net/ipv4/netfilter/ipt_random.c
@@ -0,0 +1,96 @@
+/*
+  This is a module which is used for a "random" match support.
+  This file is distributed under the terms of the GNU General Public
+  License (GPL). Copies of the GPL can be obtained from:
+     ftp://prep.ai.mit.edu/pub/gnu/GPL
+
+  2001-10-14 Fabrice MARIE <fabrice@netfilter.org> : initial implementation.
+*/
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/random.h>
+#include <net/tcp.h>
+#include <linux/spinlock.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_random.h>
+
+MODULE_LICENSE("GPL");
+
+static int
+ipt_rand_match(const struct sk_buff *pskb,
+	       const struct net_device *in,
+	       const struct net_device *out,
+	       const void *matchinfo,
+	       int offset,
+	       const void *hdr,
+	       u_int16_t datalen,
+	       int *hotdrop)
+{
+	/* Parameters from userspace */
+	const struct ipt_rand_info *info = matchinfo;
+	u_int8_t random_number;
+
+	/* get 1 random number from the kernel random number generation routine */
+	get_random_bytes((void *)(&random_number), 1);
+
+	/* Do we match ? */
+	if (random_number <= info->average)
+		return 1;
+	else
+		return 0;
+}
+
+static int
+ipt_rand_checkentry(const char *tablename,
+		   const struct ipt_ip *e,
+		   void *matchinfo,
+		   unsigned int matchsize,
+		   unsigned int hook_mask)
+{
+	/* Parameters from userspace */
+	const struct ipt_rand_info *info = matchinfo;
+
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_rand_info))) {
+		printk("ipt_random: matchsize %u != %u\n", matchsize,
+		       IPT_ALIGN(sizeof(struct ipt_rand_info)));
+		return 0;
+	}
+
+	/* must be  1 <= average % <= 99 */
+	/* 1  x 2.55 = 2   */
+	/* 99 x 2.55 = 252 */
+	if ((info->average < 2) || (info->average > 252)) {
+		printk("ipt_random:  invalid average %u\n", info->average);
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_match ipt_rand_reg = { 
+	{NULL, NULL},
+	"random",
+	ipt_rand_match,
+	ipt_rand_checkentry,
+	NULL,
+	THIS_MODULE };
+
+static int __init init(void)
+{
+	if (ipt_register_match(&ipt_rand_reg))
+		return -EINVAL;
+
+	printk("ipt_random match loaded\n");
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&ipt_rand_reg);
+	printk("ipt_random match unloaded\n");
+}
+
+module_init(init);
+module_exit(fini);
Index: linux-2.4.35.4/net/ipv4/netfilter/Makefile
===================================================================
--- linux-2.4.35.4.orig/net/ipv4/netfilter/Makefile
+++ linux-2.4.35.4/net/ipv4/netfilter/Makefile
@@ -115,6 +115,8 @@ obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos
 obj-$(CONFIG_IP_NF_MATCH_TIME) += ipt_time.o
 obj-$(CONFIG_IP_NF_MATCH_CONDITION) += ipt_condition.o
 
+obj-$(CONFIG_IP_NF_MATCH_RANDOM) += ipt_random.o
+
 obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
 
 obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
Index: linux-2.4.35.4/net/ipv6/netfilter/Config.in
===================================================================
--- linux-2.4.35.4.orig/net/ipv6/netfilter/Config.in
+++ linux-2.4.35.4/net/ipv6/netfilter/Config.in
@@ -19,6 +19,7 @@ if [ "$CONFIG_IP6_NF_IPTABLES" != "n" ];
   dep_tristate '  limit match support' CONFIG_IP6_NF_MATCH_LIMIT $CONFIG_IP6_NF_IPTABLES
   dep_tristate '  condition match support' CONFIG_IP6_NF_MATCH_CONDITION $CONFIG_IP6_NF_IPTABLES
   dep_tristate '  MAC address match support' CONFIG_IP6_NF_MATCH_MAC $CONFIG_IP6_NF_IPTABLES
+  dep_tristate '  Random match support' CONFIG_IP6_NF_MATCH_RANDOM $CONFIG_IP6_NF_IPTABLES
   if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
     dep_tristate '  Routing header match support (EXPERIMENTAL)' CONFIG_IP6_NF_MATCH_RT $CONFIG_IP6_NF_IPTABLES
   fi
Index: linux-2.4.35.4/net/ipv6/netfilter/ip6t_random.c
===================================================================
--- /dev/null
+++ linux-2.4.35.4/net/ipv6/netfilter/ip6t_random.c
@@ -0,0 +1,97 @@
+/*
+  This is a module which is used for a "random" match support.
+  This file is distributed under the terms of the GNU General Public
+  License (GPL). Copies of the GPL can be obtained from:
+     ftp://prep.ai.mit.edu/pub/gnu/GPL
+
+  2001-10-14 Fabrice MARIE <fabrice@netfilter.org> : initial implementation.
+  2003-04-30 Maciej Soltysiak <solt@dns.toxicfilms.tv> : IPv6 Port
+*/
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/random.h>
+#include <net/tcp.h>
+#include <linux/spinlock.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv6/ip6t_random.h>
+
+MODULE_LICENSE("GPL");
+
+static int
+ip6t_rand_match(const struct sk_buff *pskb,
+	       const struct net_device *in,
+	       const struct net_device *out,
+	       const void *matchinfo,
+	       int offset,
+	       const void *hdr,
+	       u_int16_t datalen,
+	       int *hotdrop)
+{
+	/* Parameters from userspace */
+	const struct ip6t_rand_info *info = matchinfo;
+	u_int8_t random_number;
+
+	/* get 1 random number from the kernel random number generation routine */
+	get_random_bytes((void *)(&random_number), 1);
+
+	/* Do we match ? */
+	if (random_number <= info->average)
+		return 1;
+	else
+		return 0;
+}
+
+static int
+ip6t_rand_checkentry(const char *tablename,
+		   const struct ip6t_ip6 *e,
+		   void *matchinfo,
+		   unsigned int matchsize,
+		   unsigned int hook_mask)
+{
+	/* Parameters from userspace */
+	const struct ip6t_rand_info *info = matchinfo;
+
+	if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_rand_info))) {
+		printk("ip6t_random: matchsize %u != %u\n", matchsize,
+		       IP6T_ALIGN(sizeof(struct ip6t_rand_info)));
+		return 0;
+	}
+
+	/* must be  1 <= average % <= 99 */
+	/* 1  x 2.55 = 2   */
+	/* 99 x 2.55 = 252 */
+	if ((info->average < 2) || (info->average > 252)) {
+		printk("ip6t_random:  invalid average %u\n", info->average);
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ip6t_match ip6t_rand_reg = { 
+	{NULL, NULL},
+	"random",
+	ip6t_rand_match,
+	ip6t_rand_checkentry,
+	NULL,
+	THIS_MODULE };
+
+static int __init init(void)
+{
+	if (ip6t_register_match(&ip6t_rand_reg))
+		return -EINVAL;
+
+	printk("ip6t_random match loaded\n");
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	ip6t_unregister_match(&ip6t_rand_reg);
+	printk("ip6t_random match unloaded\n");
+}
+
+module_init(init);
+module_exit(fini);
Index: linux-2.4.35.4/net/ipv6/netfilter/Makefile
===================================================================
--- linux-2.4.35.4.orig/net/ipv6/netfilter/Makefile
+++ linux-2.4.35.4/net/ipv6/netfilter/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_IP6_NF_TARGET_MARK) += ip6t
 obj-$(CONFIG_IP6_NF_TARGET_IMQ) += ip6t_IMQ.o
 obj-$(CONFIG_IP6_NF_QUEUE) += ip6_queue.o
 obj-$(CONFIG_IP6_NF_TARGET_LOG) += ip6t_LOG.o
+obj-$(CONFIG_IP6_NF_MATCH_RANDOM) += ip6t_random.o
 obj-$(CONFIG_IP6_NF_MATCH_HL) += ip6t_hl.o
 
 include $(TOPDIR)/Rules.make
