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Code Issues

Add ipt_random module

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SVN-Revision: 8014
This commit is contained in:
Florian Fainelli 2007-07-17 08:47:44 +00:00
parent 62e1634ed9
commit e5520b8853
2 changed files with 321 additions and 0 deletions
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3
include/netfilter.mk
View File

@ -71,6 +71,9 @@ IPT_IPOPT-$(CONFIG_IP_NF_MATCH_MARK) += $(P_V4)ipt_mark
IPT_IPOPT-$(CONFIG_NETFILTER_XT_MATCH_MARK) += $(P_XT)xt_mark
IPT_IPOPT-$(CONFIG_IP_NF_TARGET_MARK) += $(P_V4)ipt_MARK
IPT_IPOPT-$(CONFIG_NETFILTER_XT_TARGET_MARK) += $(P_XT)xt_MARK
ifeq ($(CONFIG_LINUX_2_4),y)
IPT_IPOPT-$(CONFIG_NETFILTER_XT_TARGET_MARK) += $(P_V4)ipt_random
endif
IPT_IPOPT-$(CONFIG_IP_NF_MATCH_TCPMSS) += $(P_V4)ipt_tcpmss
IPT_IPOPT-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += $(P_XT)xt_tcpmss
IPT_IPOPT-$(CONFIG_IP_NF_TARGET_TCPMSS) += $(P_V4)ipt_TCPMSS

318
target/linux/generic-2.4/patches/621-netfilter_random.patch Normal file
View File

@ -0,0 +1,318 @@
diff -Naurp linux-2.4.34/Documentation/Configure.help linux-2.4.34.patched/Documentation/Configure.help
--- linux-2.4.34/Documentation/Configure.help 2007-07-08 05:01:42.000000000 +0200
+++ linux-2.4.34.patched/Documentation/Configure.help 2007-07-08 05:02:26.000000000 +0200
@@ -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
@@ -3221,6 +3230,7 @@ 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
@@ -3299,6 +3309,14 @@ 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
diff -Naurp linux-2.4.34/include/linux/netfilter_ipv4/ipt_random.h linux-2.4.34.patched/include/linux/netfilter_ipv4/ipt_random.h
--- linux-2.4.34/include/linux/netfilter_ipv4/ipt_random.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.34.patched/include/linux/netfilter_ipv4/ipt_random.h 2007-07-08 05:02:26.000000000 +0200
@@ -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*/
diff -Naurp linux-2.4.34/include/linux/netfilter_ipv6/ip6t_random.h linux-2.4.34.patched/include/linux/netfilter_ipv6/ip6t_random.h
--- linux-2.4.34/include/linux/netfilter_ipv6/ip6t_random.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.34.patched/include/linux/netfilter_ipv6/ip6t_random.h 2007-07-08 05:02:26.000000000 +0200
@@ -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*/
diff -Naurp linux-2.4.34/net/ipv4/netfilter/Config.in linux-2.4.34.patched/net/ipv4/netfilter/Config.in
--- linux-2.4.34/net/ipv4/netfilter/Config.in 2007-07-08 05:01:42.000000000 +0200
+++ linux-2.4.34.patched/net/ipv4/netfilter/Config.in 2007-07-08 05:03:32.000000000 +0200
@@ -32,6 +32,7 @@ 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
diff -Naurp linux-2.4.34/net/ipv4/netfilter/ipt_random.c linux-2.4.34.patched/net/ipv4/netfilter/ipt_random.c
--- linux-2.4.34/net/ipv4/netfilter/ipt_random.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.34.patched/net/ipv4/netfilter/ipt_random.c 2007-07-08 05:02:26.000000000 +0200
@@ -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);
diff -Naurp linux-2.4.34/net/ipv4/netfilter/Makefile linux-2.4.34.patched/net/ipv4/netfilter/Makefile
--- linux-2.4.34/net/ipv4/netfilter/Makefile 2007-07-08 05:01:42.000000000 +0200
+++ linux-2.4.34.patched/net/ipv4/netfilter/Makefile 2007-07-08 05:02:26.000000000 +0200
@@ -102,6 +102,8 @@ 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-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
diff -Naurp linux-2.4.34/net/ipv6/netfilter/Config.in linux-2.4.34.patched/net/ipv6/netfilter/Config.in
--- linux-2.4.34/net/ipv6/netfilter/Config.in 2007-07-08 05:01:42.000000000 +0200
+++ linux-2.4.34.patched/net/ipv6/netfilter/Config.in 2007-07-08 05:02:26.000000000 +0200
@@ -19,6 +19,7 @@ if [ "$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
diff -Naurp linux-2.4.34/net/ipv6/netfilter/ip6t_random.c linux-2.4.34.patched/net/ipv6/netfilter/ip6t_random.c
--- linux-2.4.34/net/ipv6/netfilter/ip6t_random.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.34.patched/net/ipv6/netfilter/ip6t_random.c 2007-07-08 05:02:26.000000000 +0200
@@ -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);
diff -Naurp linux-2.4.34/net/ipv6/netfilter/Makefile linux-2.4.34.patched/net/ipv6/netfilter/Makefile
--- linux-2.4.34/net/ipv6/netfilter/Makefile 2007-07-08 05:01:42.000000000 +0200
+++ linux-2.4.34.patched/net/ipv6/netfilter/Makefile 2007-07-08 05:02:26.000000000 +0200
@@ -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