[NETFILTER]: x_tables: add port of hashlimit match for IPv4 and IPv6

Signed-off-by: Patrick McHardy <kaber@trash.net>

include/linux/netfilter/Kbuild

@@ -14,6 +14,7 @@ header-y += xt_dscp.h
 header-y += xt_DSCP.h
 header-y += xt_esp.h
 header-y += xt_helper.h
+header-y += xt_hashlimit.h
 header-y += xt_length.h
 header-y += xt_limit.h
 header-y += xt_mac.h

include/linux/netfilter/xt_hashlimit.h

+#ifndef _XT_HASHLIMIT_H
+#define _XT_HASHLIMIT_H
+
+/* timings are in milliseconds. */
+#define XT_HASHLIMIT_SCALE 10000
+/* 1/10,000 sec period => max of 10,000/sec.  Min rate is then 429490
+   seconds, or one every 59 hours. */
+
+/* details of this structure hidden by the implementation */
+struct xt_hashlimit_htable;
+
+#define XT_HASHLIMIT_HASH_DIP	0x0001
+#define XT_HASHLIMIT_HASH_DPT	0x0002
+#define XT_HASHLIMIT_HASH_SIP	0x0004
+#define XT_HASHLIMIT_HASH_SPT	0x0008
+
+struct hashlimit_cfg {
+	u_int32_t mode;	  /* bitmask of IPT_HASHLIMIT_HASH_* */
+	u_int32_t avg;    /* Average secs between packets * scale */
+	u_int32_t burst;  /* Period multiplier for upper limit. */
+
+	/* user specified */
+	u_int32_t size;		/* how many buckets */
+	u_int32_t max;		/* max number of entries */
+	u_int32_t gc_interval;	/* gc interval */
+	u_int32_t expire;	/* when do entries expire? */
+};
+
+struct xt_hashlimit_info {
+	char name [IFNAMSIZ];		/* name */
+	struct hashlimit_cfg cfg;
+	struct xt_hashlimit_htable *hinfo;
+
+	/* Used internally by the kernel */
+	union {
+		void *ptr;
+		struct xt_hashlimit_info *master;
+	} u;
+};
+#endif /*_XT_HASHLIMIT_H*/

include/linux/netfilter_ipv4/ipt_hashlimit.h

 #ifndef _IPT_HASHLIMIT_H
 #define _IPT_HASHLIMIT_H
 
-/* timings are in milliseconds. */
-#define IPT_HASHLIMIT_SCALE 10000
-/* 1/10,000 sec period => max of 10,000/sec.  Min rate is then 429490
-   seconds, or one every 59 hours. */
+#include <linux/netfilter/xt_hashlimit.h>
 
-/* details of this structure hidden by the implementation */
-struct ipt_hashlimit_htable;
+#define IPT_HASHLIMIT_SCALE	XT_HASHLIMIT_SCALE
+#define IPT_HASHLIMIT_HASH_DIP	XT_HASHLIMIT_HASH_DIP
+#define IPT_HASHLIMIT_HASH_DPT	XT_HASHLIMIT_HASH_DPT
+#define IPT_HASHLIMIT_HASH_SIP	XT_HASHLIMIT_HASH_SIP
+#define IPT_HASHLIMIT_HASH_SPT	XT_HASHLIMIT_HASH_SPT
 
-#define IPT_HASHLIMIT_HASH_DIP	0x0001
-#define IPT_HASHLIMIT_HASH_DPT	0x0002
-#define IPT_HASHLIMIT_HASH_SIP	0x0004
-#define IPT_HASHLIMIT_HASH_SPT	0x0008
+#define ipt_hashlimit_info xt_hashlimit_info
 
-struct hashlimit_cfg {
-	u_int32_t mode;	  /* bitmask of IPT_HASHLIMIT_HASH_* */
-	u_int32_t avg;    /* Average secs between packets * scale */
-	u_int32_t burst;  /* Period multiplier for upper limit. */
-
-	/* user specified */
-	u_int32_t size;		/* how many buckets */
-	u_int32_t max;		/* max number of entries */
-	u_int32_t gc_interval;	/* gc interval */
-	u_int32_t expire;	/* when do entries expire? */
-};
-
-struct ipt_hashlimit_info {
-	char name [IFNAMSIZ];		/* name */
-	struct hashlimit_cfg cfg;
-	struct ipt_hashlimit_htable *hinfo;
-
-	/* Used internally by the kernel */
-	union {
-		void *ptr;
-		struct ipt_hashlimit_info *master;
-	} u;
-};
-#endif /*_IPT_HASHLIMIT_H*/
+#endif /* _IPT_HASHLIMIT_H */

net/ipv4/netfilter/Kconfig

@@ -326,20 +326,6 @@ config IP_NF_MATCH_ADDRTYPE
 	  If you want to compile it as a module, say M here and read
 	  <file:Documentation/modules.txt>.  If unsure, say `N'.
 
-config IP_NF_MATCH_HASHLIMIT
-	tristate  'hashlimit match support'
-	depends on IP_NF_IPTABLES
-	help
-	  This option adds a new iptables `hashlimit' match.  
-
-	  As opposed to `limit', this match dynamically creates a hash table
-	  of limit buckets, based on your selection of source/destination
-	  ip addresses and/or ports.
-
-	  It enables you to express policies like `10kpps for any given
-	  destination IP' or `500pps from any given source IP'  with a single
-	  IPtables rule.
-
 # `filter', generic and specific targets
 config IP_NF_FILTER
 	tristate "Packet filtering"

net/ipv4/netfilter/Makefile

@@ -53,7 +53,6 @@ obj-$(CONFIG_IP_NF_NAT) += iptable_nat.o
 obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o
 
 # matches
-obj-$(CONFIG_IP_NF_MATCH_HASHLIMIT) += ipt_hashlimit.o
 obj-$(CONFIG_IP_NF_MATCH_IPRANGE) += ipt_iprange.o
 obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_owner.o
 obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o

net/netfilter/Kconfig

@@ -464,5 +464,19 @@ config NETFILTER_XT_MATCH_TCPMSS
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+config NETFILTER_XT_MATCH_HASHLIMIT
+	tristate '"hashlimit" match support'
+	depends on NETFILTER_XTABLES
+	help
+	  This option adds a `hashlimit' match.
+
+	  As opposed to `limit', this match dynamically creates a hash table
+	  of limit buckets, based on your selection of source/destination
+	  addresses and/or ports.
+
+	  It enables you to express policies like `10kpps for any given
+	  destination address' or `500pps from any given source address'
+	  with a single rule.
+
 endmenu
 

net/netfilter/Makefile

@@ -59,3 +59,4 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_STATISTIC) += xt_statistic.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) += xt_string.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_PHYSDEV) += xt_physdev.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_HASHLIMIT) += xt_hashlimit.o