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310 lines
8.9 KiB
Diff
310 lines
8.9 KiB
Diff
--- a/Documentation/Configure.help
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+++ b/Documentation/Configure.help
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@@ -2914,6 +2914,15 @@ CONFIG_IP_NF_MATCH_MAC
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If you want to compile it as a module, say M here and read
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<file:Documentation/modules.txt>. If unsure, say `N'.
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+Random match support
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+CONFIG_IP_NF_MATCH_RANDOM
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+ This option adds a `random' match,
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+ which allow you to match packets randomly
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+ following a given probability.
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+
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+ If you want to compile it as a module, say M here and read
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+ Documentation/modules.txt. If unsure, say `N'.
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+
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Netfilter MARK match support
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CONFIG_IP_NF_MATCH_MARK
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Netfilter mark matching allows you to match packets based on the
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@@ -3229,6 +3238,7 @@ CONFIG_IP_NF_MATCH_HELPER
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If you want to compile it as a module, say M here and read
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Documentation/modules.txt. If unsure, say `Y'.
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+
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TCPMSS match support
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CONFIG_IP_NF_MATCH_TCPMSS
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This option adds a `tcpmss' match, which allows you to examine the
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@@ -3318,6 +3328,14 @@ CONFIG_IP6_NF_MATCH_MAC
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If you want to compile it as a module, say M here and read
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<file:Documentation/modules.txt>. If unsure, say `N'.
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+CONFIG_IP6_NF_MATCH_RANDOM
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+ This option adds a `random' match,
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+ which allow you to match packets randomly
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+ following a given probability.
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+
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+ If you want to compile it as a module, say M here and read
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+ Documentation/modules.txt. If unsure, say `N'.
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+
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length match support
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CONFIG_IP6_NF_MATCH_LENGTH
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This option allows you to match the length of a packet against a
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--- /dev/null
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+++ b/include/linux/netfilter_ipv4/ipt_random.h
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@@ -0,0 +1,11 @@
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+#ifndef _IPT_RAND_H
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+#define _IPT_RAND_H
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+
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+#include <linux/param.h>
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+#include <linux/types.h>
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+
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+struct ipt_rand_info {
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+ u_int8_t average;
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+};
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+
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+#endif /*_IPT_RAND_H*/
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--- /dev/null
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+++ b/include/linux/netfilter_ipv6/ip6t_random.h
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@@ -0,0 +1,11 @@
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+#ifndef _IP6T_RAND_H
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+#define _IP6T_RAND_H
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+
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+#include <linux/param.h>
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+#include <linux/types.h>
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+
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+struct ip6t_rand_info {
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+ u_int8_t average;
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+};
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+
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+#endif /*_IP6T_RAND_H*/
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--- a/net/ipv4/netfilter/Config.in
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+++ b/net/ipv4/netfilter/Config.in
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@@ -32,6 +32,7 @@ if [ "$CONFIG_IP_NF_IPTABLES" != "n" ];
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dep_tristate ' netfilter MARK match support' CONFIG_IP_NF_MATCH_MARK $CONFIG_IP_NF_IPTABLES
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dep_tristate ' Multiple port match support' CONFIG_IP_NF_MATCH_MULTIPORT $CONFIG_IP_NF_IPTABLES
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dep_tristate ' TOS match support' CONFIG_IP_NF_MATCH_TOS $CONFIG_IP_NF_IPTABLES
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+ dep_tristate ' random match support' CONFIG_IP_NF_MATCH_RANDOM $CONFIG_IP_NF_IPTABLES
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dep_tristate ' condition match support' CONFIG_IP_NF_MATCH_CONDITION $CONFIG_IP_NF_IPTABLES
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dep_tristate ' recent match support' CONFIG_IP_NF_MATCH_RECENT $CONFIG_IP_NF_IPTABLES
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dep_tristate ' ECN match support' CONFIG_IP_NF_MATCH_ECN $CONFIG_IP_NF_IPTABLES
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--- /dev/null
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+++ b/net/ipv4/netfilter/ipt_random.c
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@@ -0,0 +1,96 @@
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+/*
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+ This is a module which is used for a "random" match support.
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+ This file is distributed under the terms of the GNU General Public
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+ License (GPL). Copies of the GPL can be obtained from:
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+ ftp://prep.ai.mit.edu/pub/gnu/GPL
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+
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+ 2001-10-14 Fabrice MARIE <fabrice@netfilter.org> : initial implementation.
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+*/
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+
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+#include <linux/module.h>
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+#include <linux/skbuff.h>
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+#include <linux/ip.h>
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+#include <linux/random.h>
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+#include <net/tcp.h>
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+#include <linux/spinlock.h>
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+#include <linux/netfilter_ipv4/ip_tables.h>
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+#include <linux/netfilter_ipv4/ipt_random.h>
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+
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+MODULE_LICENSE("GPL");
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+
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+static int
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+ipt_rand_match(const struct sk_buff *pskb,
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+ const struct net_device *in,
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+ const struct net_device *out,
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+ const void *matchinfo,
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+ int offset,
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+ const void *hdr,
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+ u_int16_t datalen,
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+ int *hotdrop)
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+{
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+ /* Parameters from userspace */
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+ const struct ipt_rand_info *info = matchinfo;
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+ u_int8_t random_number;
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+
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+ /* get 1 random number from the kernel random number generation routine */
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+ get_random_bytes((void *)(&random_number), 1);
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+
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+ /* Do we match ? */
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+ if (random_number <= info->average)
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+ return 1;
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+ else
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+ return 0;
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+}
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+
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+static int
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+ipt_rand_checkentry(const char *tablename,
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+ const struct ipt_ip *e,
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+ void *matchinfo,
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+ unsigned int matchsize,
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+ unsigned int hook_mask)
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+{
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+ /* Parameters from userspace */
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+ const struct ipt_rand_info *info = matchinfo;
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+
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+ if (matchsize != IPT_ALIGN(sizeof(struct ipt_rand_info))) {
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+ printk("ipt_random: matchsize %u != %u\n", matchsize,
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+ IPT_ALIGN(sizeof(struct ipt_rand_info)));
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+ return 0;
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+ }
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+
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+ /* must be 1 <= average % <= 99 */
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+ /* 1 x 2.55 = 2 */
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+ /* 99 x 2.55 = 252 */
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+ if ((info->average < 2) || (info->average > 252)) {
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+ printk("ipt_random: invalid average %u\n", info->average);
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+ return 0;
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+ }
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+
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+ return 1;
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+}
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+
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+static struct ipt_match ipt_rand_reg = {
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+ {NULL, NULL},
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+ "random",
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+ ipt_rand_match,
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+ ipt_rand_checkentry,
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+ NULL,
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+ THIS_MODULE };
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+
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+static int __init init(void)
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+{
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+ if (ipt_register_match(&ipt_rand_reg))
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+ return -EINVAL;
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+
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+ printk("ipt_random match loaded\n");
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+ return 0;
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+}
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+
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+static void __exit fini(void)
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+{
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+ ipt_unregister_match(&ipt_rand_reg);
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+ printk("ipt_random match unloaded\n");
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+}
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+
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+module_init(init);
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+module_exit(fini);
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--- a/net/ipv4/netfilter/Makefile
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+++ b/net/ipv4/netfilter/Makefile
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@@ -93,6 +93,8 @@ obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_o
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obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o
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obj-$(CONFIG_IP_NF_MATCH_CONDITION) += ipt_condition.o
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+obj-$(CONFIG_IP_NF_MATCH_RANDOM) += ipt_random.o
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+
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obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
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obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
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--- a/net/ipv6/netfilter/Config.in
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+++ b/net/ipv6/netfilter/Config.in
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@@ -19,6 +19,7 @@ if [ "$CONFIG_IP6_NF_IPTABLES" != "n" ];
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dep_tristate ' limit match support' CONFIG_IP6_NF_MATCH_LIMIT $CONFIG_IP6_NF_IPTABLES
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dep_tristate ' condition match support' CONFIG_IP6_NF_MATCH_CONDITION $CONFIG_IP6_NF_IPTABLES
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dep_tristate ' MAC address match support' CONFIG_IP6_NF_MATCH_MAC $CONFIG_IP6_NF_IPTABLES
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+ dep_tristate ' Random match support' CONFIG_IP6_NF_MATCH_RANDOM $CONFIG_IP6_NF_IPTABLES
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if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
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dep_tristate ' Routing header match support (EXPERIMENTAL)' CONFIG_IP6_NF_MATCH_RT $CONFIG_IP6_NF_IPTABLES
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fi
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--- /dev/null
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+++ b/net/ipv6/netfilter/ip6t_random.c
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@@ -0,0 +1,97 @@
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+/*
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+ This is a module which is used for a "random" match support.
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+ This file is distributed under the terms of the GNU General Public
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+ License (GPL). Copies of the GPL can be obtained from:
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+ ftp://prep.ai.mit.edu/pub/gnu/GPL
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+
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+ 2001-10-14 Fabrice MARIE <fabrice@netfilter.org> : initial implementation.
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+ 2003-04-30 Maciej Soltysiak <solt@dns.toxicfilms.tv> : IPv6 Port
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+*/
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+
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+#include <linux/module.h>
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+#include <linux/skbuff.h>
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+#include <linux/ip.h>
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+#include <linux/random.h>
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+#include <net/tcp.h>
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+#include <linux/spinlock.h>
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+#include <linux/netfilter_ipv6/ip6_tables.h>
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+#include <linux/netfilter_ipv6/ip6t_random.h>
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+
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+MODULE_LICENSE("GPL");
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+
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+static int
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+ip6t_rand_match(const struct sk_buff *pskb,
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+ const struct net_device *in,
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+ const struct net_device *out,
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+ const void *matchinfo,
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+ int offset,
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+ const void *hdr,
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+ u_int16_t datalen,
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+ int *hotdrop)
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+{
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+ /* Parameters from userspace */
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+ const struct ip6t_rand_info *info = matchinfo;
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+ u_int8_t random_number;
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+
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+ /* get 1 random number from the kernel random number generation routine */
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+ get_random_bytes((void *)(&random_number), 1);
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+
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+ /* Do we match ? */
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+ if (random_number <= info->average)
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+ return 1;
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+ else
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+ return 0;
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+}
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+
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+static int
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+ip6t_rand_checkentry(const char *tablename,
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+ const struct ip6t_ip6 *e,
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+ void *matchinfo,
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+ unsigned int matchsize,
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+ unsigned int hook_mask)
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+{
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+ /* Parameters from userspace */
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+ const struct ip6t_rand_info *info = matchinfo;
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+
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+ if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_rand_info))) {
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+ printk("ip6t_random: matchsize %u != %u\n", matchsize,
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+ IP6T_ALIGN(sizeof(struct ip6t_rand_info)));
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+ return 0;
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+ }
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+
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+ /* must be 1 <= average % <= 99 */
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+ /* 1 x 2.55 = 2 */
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+ /* 99 x 2.55 = 252 */
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+ if ((info->average < 2) || (info->average > 252)) {
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+ printk("ip6t_random: invalid average %u\n", info->average);
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+ return 0;
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+ }
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+
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+ return 1;
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+}
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+
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+static struct ip6t_match ip6t_rand_reg = {
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+ {NULL, NULL},
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+ "random",
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+ ip6t_rand_match,
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+ ip6t_rand_checkentry,
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+ NULL,
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+ THIS_MODULE };
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+
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+static int __init init(void)
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+{
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+ if (ip6t_register_match(&ip6t_rand_reg))
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+ return -EINVAL;
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+
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+ printk("ip6t_random match loaded\n");
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+ return 0;
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+}
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+
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+static void __exit fini(void)
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+{
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+ ip6t_unregister_match(&ip6t_rand_reg);
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+ printk("ip6t_random match unloaded\n");
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+}
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+
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+module_init(init);
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+module_exit(fini);
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--- a/net/ipv6/netfilter/Makefile
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+++ b/net/ipv6/netfilter/Makefile
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@@ -32,6 +32,7 @@ obj-$(CONFIG_IP6_NF_TARGET_MARK) += ip6t
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obj-$(CONFIG_IP6_NF_TARGET_IMQ) += ip6t_IMQ.o
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obj-$(CONFIG_IP6_NF_QUEUE) += ip6_queue.o
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obj-$(CONFIG_IP6_NF_TARGET_LOG) += ip6t_LOG.o
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+obj-$(CONFIG_IP6_NF_MATCH_RANDOM) += ip6t_random.o
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obj-$(CONFIG_IP6_NF_MATCH_HL) += ip6t_hl.o
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include $(TOPDIR)/Rules.make
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