130-netfilter_ipset.patch

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Index: linux-2.6.21.7/include/linux/netfilter_ipv4/ip_set.h
===================================================================
--- /dev/null
+++ linux-2.6.21.7/include/linux/netfilter_ipv4/ip_set.h
@@ -0,0 +1,498 @@
+#ifndef _IP_SET_H
+#define _IP_SET_H
+
+/* Copyright (C) 2000-2002 Joakim Axelsson <[e-mail]>
+ *                         Patrick Schaaf <[e-mail]>
+ *                         Martin Josefsson <[e-mail]>
+ * Copyright (C) 2003-2004 Jozsef Kadlecsik <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.  
+ */
+
+#if 0
+#define IP_SET_DEBUG
+#endif
+
+/*
+ * A sockopt of such quality has hardly ever been seen before on the open
+ * market!  This little beauty, hardly ever used: above 64, so it's
+ * traditionally used for firewalling, not touched (even once!) by the
+ * 2.0, 2.2 and 2.4 kernels!
+ *
+ * Comes with its own certificate of authenticity, valid anywhere in the
+ * Free world!
+ *
+ * Rusty, 19.4.2000
+ */
+#define SO_IP_SET 		83
+
+/*
+ * Heavily modify by Joakim Axelsson 08.03.2002
+ * - Made it more modulebased
+ *
+ * Additional heavy modifications by Jozsef Kadlecsik 22.02.2004
+ * - bindings added
+ * - in order to "deal with" backward compatibility, renamed to ipset
+ */
+
+/* 
+ * Used so that the kernel module and ipset-binary can match their versions 
+ */
+#define IP_SET_PROTOCOL_VERSION 2
+
+#define IP_SET_MAXNAMELEN 32	/* set names and set typenames */
+
+/* Lets work with our own typedef for representing an IP address.
+ * We hope to make the code more portable, possibly to IPv6...
+ *
+ * The representation works in HOST byte order, because most set types
+ * will perform arithmetic operations and compare operations.
+ * 
+ * For now the type is an uint32_t.
+ *
+ * Make sure to ONLY use the functions when translating and parsing
+ * in order to keep the host byte order and make it more portable:
+ *  parse_ip()
+ *  parse_mask()
+ *  parse_ipandmask()
+ *  ip_tostring()
+ * (Joakim: where are they???)
+ */
+
+typedef uint32_t ip_set_ip_t;
+
+/* Sets are identified by an id in kernel space. Tweak with ip_set_id_t
+ * and IP_SET_INVALID_ID if you want to increase the max number of sets.
+ */
+typedef uint16_t ip_set_id_t;
+
+#define IP_SET_INVALID_ID	65535
+
+/* How deep we follow bindings */
+#define IP_SET_MAX_BINDINGS	6
+
+/*
+ * Option flags for kernel operations (ipt_set_info)
+ */
+#define IPSET_SRC 		0x01	/* Source match/add */
+#define IPSET_DST		0x02	/* Destination match/add */
+#define IPSET_MATCH_INV		0x04	/* Inverse matching */
+
+/*
+ * Set features
+ */
+#define IPSET_TYPE_IP		0x01	/* IP address type of set */
+#define IPSET_TYPE_PORT		0x02	/* Port type of set */
+#define IPSET_DATA_SINGLE	0x04	/* Single data storage */
+#define IPSET_DATA_DOUBLE	0x08	/* Double data storage */
+
+/* Reserved keywords */
+#define IPSET_TOKEN_DEFAULT	":default:"
+#define IPSET_TOKEN_ALL		":all:"
+
+/* SO_IP_SET operation constants, and their request struct types.
+ *
+ * Operation ids:
+ *	  0-99:	 commands with version checking
+ *	100-199: add/del/test/bind/unbind
+ *	200-299: list, save, restore
+ */
+
+/* Single shot operations: 
+ * version, create, destroy, flush, rename and swap 
+ *
+ * Sets are identified by name.
+ */
+
+#define IP_SET_REQ_STD		\
+	unsigned op;		\
+	unsigned version;	\
+	char name[IP_SET_MAXNAMELEN]
+
+#define IP_SET_OP_CREATE	0x00000001	/* Create a new (empty) set */
+struct ip_set_req_create {
+	IP_SET_REQ_STD;
+	char typename[IP_SET_MAXNAMELEN];
+};
+
+#define IP_SET_OP_DESTROY	0x00000002	/* Remove a (empty) set */
+struct ip_set_req_std {
+	IP_SET_REQ_STD;
+};
+
+#define IP_SET_OP_FLUSH		0x00000003	/* Remove all IPs in a set */
+/* Uses ip_set_req_std */
+
+#define IP_SET_OP_RENAME	0x00000004	/* Rename a set */
+/* Uses ip_set_req_create */
+
+#define IP_SET_OP_SWAP		0x00000005	/* Swap two sets */
+/* Uses ip_set_req_create */
+
+union ip_set_name_index {
+	char name[IP_SET_MAXNAMELEN];
+	ip_set_id_t index;
+};
+
+#define IP_SET_OP_GET_BYNAME	0x00000006	/* Get set index by name */
+struct ip_set_req_get_set {
+	unsigned op;
+	unsigned version;
+	union ip_set_name_index set;
+};
+
+#define IP_SET_OP_GET_BYINDEX	0x00000007	/* Get set name by index */
+/* Uses ip_set_req_get_set */
+
+#define IP_SET_OP_VERSION	0x00000100	/* Ask kernel version */
+struct ip_set_req_version {
+	unsigned op;
+	unsigned version;
+};
+
+/* Double shots operations: 
+ * add, del, test, bind and unbind.
+ *
+ * First we query the kernel to get the index and type of the target set,
+ * then issue the command. Validity of IP is checked in kernel in order
+ * to minimalize sockopt operations.
+ */
+
+/* Get minimal set data for add/del/test/bind/unbind IP */
+#define IP_SET_OP_ADT_GET	0x00000010	/* Get set and type */
+struct ip_set_req_adt_get {
+	unsigned op;
+	unsigned version;
+	union ip_set_name_index set;
+	char typename[IP_SET_MAXNAMELEN];
+};
+
+#define IP_SET_REQ_BYINDEX	\
+	unsigned op;		\
+	ip_set_id_t index;
+
+struct ip_set_req_adt {
+	IP_SET_REQ_BYINDEX;
+};
+
+#define IP_SET_OP_ADD_IP	0x00000101	/* Add an IP to a set */
+/* Uses ip_set_req_adt, with type specific addage */
+
+#define IP_SET_OP_DEL_IP	0x00000102	/* Remove an IP from a set */
+/* Uses ip_set_req_adt, with type specific addage */
+
+#define IP_SET_OP_TEST_IP	0x00000103	/* Test an IP in a set */
+/* Uses ip_set_req_adt, with type specific addage */
+
+#define IP_SET_OP_BIND_SET	0x00000104	/* Bind an IP to a set */
+/* Uses ip_set_req_bind, with type specific addage */
+struct ip_set_req_bind {
+	IP_SET_REQ_BYINDEX;
+	char binding[IP_SET_MAXNAMELEN];
+};
+
+#define IP_SET_OP_UNBIND_SET	0x00000105	/* Unbind an IP from a set */
+/* Uses ip_set_req_bind, with type speficic addage 
+ * index = 0 means unbinding for all sets */
+
+#define IP_SET_OP_TEST_BIND_SET	0x00000106	/* Test binding an IP to a set */
+/* Uses ip_set_req_bind, with type specific addage */
+
+/* Multiple shots operations: list, save, restore.
+ *
+ * - check kernel version and query the max number of sets
+ * - get the basic information on all sets
+ *   and size required for the next step
+ * - get actual set data: header, data, bindings
+ */
+
+/* Get max_sets and the index of a queried set
+ */
+#define IP_SET_OP_MAX_SETS	0x00000020
+struct ip_set_req_max_sets {
+	unsigned op;
+	unsigned version;
+	ip_set_id_t max_sets;		/* max_sets */
+	ip_set_id_t sets;		/* real number of sets */
+	union ip_set_name_index set;	/* index of set if name used */
+};
+
+/* Get the id and name of the sets plus size for next step */
+#define IP_SET_OP_LIST_SIZE	0x00000201
+#define IP_SET_OP_SAVE_SIZE	0x00000202
+struct ip_set_req_setnames {
+	unsigned op;
+	ip_set_id_t index;		/* set to list/save */
+	size_t size;			/* size to get setdata/bindings */
+	/* followed by sets number of struct ip_set_name_list */
+};
+
+struct ip_set_name_list {
+	char name[IP_SET_MAXNAMELEN];
+	char typename[IP_SET_MAXNAMELEN];
+	ip_set_id_t index;
+	ip_set_id_t id;
+};
+
+/* The actual list operation */
+#define IP_SET_OP_LIST		0x00000203
+struct ip_set_req_list {
+	IP_SET_REQ_BYINDEX;
+	/* sets number of struct ip_set_list in reply */ 
+};
+
+struct ip_set_list {
+	ip_set_id_t index;
+	ip_set_id_t binding;
+	u_int32_t ref;
+	size_t header_size;	/* Set header data of header_size */
+	size_t members_size;	/* Set members data of members_size */
+	size_t bindings_size;	/* Set bindings data of bindings_size */
+};
+
+struct ip_set_hash_list {
+	ip_set_ip_t ip;
+	ip_set_id_t binding;
+};
+
+/* The save operation */
+#define IP_SET_OP_SAVE		0x00000204
+/* Uses ip_set_req_list, in the reply replaced by
+ * sets number of struct ip_set_save plus a marker
+ * ip_set_save followed by ip_set_hash_save structures.
+ */
+struct ip_set_save {
+	ip_set_id_t index;
+	ip_set_id_t binding;
+	size_t header_size;	/* Set header data of header_size */
+	size_t members_size;	/* Set members data of members_size */
+};
+
+/* At restoring, ip == 0 means default binding for the given set: */
+struct ip_set_hash_save {
+	ip_set_ip_t ip;
+	ip_set_id_t id;
+	ip_set_id_t binding;
+};
+
+/* The restore operation */
+#define IP_SET_OP_RESTORE	0x00000205
+/* Uses ip_set_req_setnames followed by ip_set_restore structures
+ * plus a marker ip_set_restore, followed by ip_set_hash_save 
+ * structures.
+ */
+struct ip_set_restore {
+	char name[IP_SET_MAXNAMELEN];
+	char typename[IP_SET_MAXNAMELEN];
+	ip_set_id_t index;
+	size_t header_size;	/* Create data of header_size */
+	size_t members_size;	/* Set members data of members_size */
+};
+
+static inline int bitmap_bytes(ip_set_ip_t a, ip_set_ip_t b)
+{
+	return 4 * ((((b - a + 8) / 8) + 3) / 4);
+}
+
+#ifdef __KERNEL__
+
+#define ip_set_printk(format, args...) 			\
+	do {							\
+		printk("%s: %s: ", __FILE__, __FUNCTION__);	\
+		printk(format "\n" , ## args);			\
+	} while (0)
+
+#if defined(IP_SET_DEBUG)
+#define DP(format, args...) 					\
+	do {							\
+		printk("%s: %s (DBG): ", __FILE__, __FUNCTION__);\
+		printk(format "\n" , ## args);			\
+	} while (0)
+#define IP_SET_ASSERT(x)					\
+	do {							\
+		if (!(x))					\
+			printk("IP_SET_ASSERT: %s:%i(%s)\n",	\
+				__FILE__, __LINE__, __FUNCTION__); \
+	} while (0)
+#else
+#define DP(format, args...)
+#define IP_SET_ASSERT(x)
+#endif
+
+struct ip_set;
+
+/*
+ * The ip_set_type definition - one per set type, e.g. "ipmap".
+ *
+ * Each individual set has a pointer, set->type, going to one
+ * of these structures. Function pointers inside the structure implement
+ * the real behaviour of the sets.
+ *
+ * If not mentioned differently, the implementation behind the function
+ * pointers of a set_type, is expected to return 0 if ok, and a negative
+ * errno (e.g. -EINVAL) on error.
+ */
+struct ip_set_type {
+	struct list_head list;	/* next in list of set types */
+
+	/* test for IP in set (kernel: iptables -m set src|dst)
+	 * return 0 if not in set, 1 if in set.
+	 */
+	int (*testip_kernel) (struct ip_set *set,
+			      const struct sk_buff * skb, 
+			      ip_set_ip_t *ip,
+			      const u_int32_t *flags,
+			      unsigned char index);
+
+	/* test for IP in set (userspace: ipset -T set IP)
+	 * return 0 if not in set, 1 if in set.
+	 */
+	int (*testip) (struct ip_set *set,
+		       const void *data, size_t size,
+		       ip_set_ip_t *ip);
+
+	/*
+	 * Size of the data structure passed by when
+	 * adding/deletin/testing an entry.
+	 */
+	size_t reqsize;
+
+	/* Add IP into set (userspace: ipset -A set IP)
+	 * Return -EEXIST if the address is already in the set,
+	 * and -ERANGE if the address lies outside the set bounds.
+	 * If the address was not already in the set, 0 is returned.
+	 */
+	int (*addip) (struct ip_set *set, 
+		      const void *data, size_t size,
+		      ip_set_ip_t *ip);
+
+	/* Add IP into set (kernel: iptables ... -j SET set src|dst)
+	 * Return -EEXIST if the address is already in the set,
+	 * and -ERANGE if the address lies outside the set bounds.
+	 * If the address was not already in the set, 0 is returned.
+	 */
+	int (*addip_kernel) (struct ip_set *set,
+			     const struct sk_buff * skb, 
+			     ip_set_ip_t *ip,
+			     const u_int32_t *flags,
+			     unsigned char index);
+
+	/* remove IP from set (userspace: ipset -D set --entry x)
+	 * Return -EEXIST if the address is NOT in the set,
+	 * and -ERANGE if the address lies outside the set bounds.
+	 * If the address really was in the set, 0 is returned.
+	 */
+	int (*delip) (struct ip_set *set, 
+		      const void *data, size_t size,
+		      ip_set_ip_t *ip);
+
+	/* remove IP from set (kernel: iptables ... -j SET --entry x)
+	 * Return -EEXIST if the address is NOT in the set,
+	 * and -ERANGE if the address lies outside the set bounds.
+	 * If the address really was in the set, 0 is returned.
+	 */
+	int (*delip_kernel) (struct ip_set *set,
+			     const struct sk_buff * skb, 
+			     ip_set_ip_t *ip,
+			     const u_int32_t *flags,
+			     unsigned char index);
+
+	/* new set creation - allocated type specific items
+	 */
+	int (*create) (struct ip_set *set,
+		       const void *data, size_t size);
+
+	/* retry the operation after successfully tweaking the set
+	 */
+	int (*retry) (struct ip_set *set);
+
+	/* set destruction - free type specific items
+	 * There is no return value.
+	 * Can be called only when child sets are destroyed.
+	 */
+	void (*destroy) (struct ip_set *set);
+
+	/* set flushing - reset all bits in the set, or something similar.
+	 * There is no return value.
+	 */
+	void (*flush) (struct ip_set *set);
+
+	/* Listing: size needed for header
+	 */
+	size_t header_size;
+
+	/* Listing: Get the header
+	 *
+	 * Fill in the information in "data".
+	 * This function is always run after list_header_size() under a 
+	 * writelock on the set. Therefor is the length of "data" always 
+	 * correct. 
+	 */
+	void (*list_header) (const struct ip_set *set, 
+			     void *data);
+
+	/* Listing: Get the size for the set members
+	 */
+	int (*list_members_size) (const struct ip_set *set);
+
+	/* Listing: Get the set members
+	 *
+	 * Fill in the information in "data".
+	 * This function is always run after list_member_size() under a 
+	 * writelock on the set. Therefor is the length of "data" always 
+	 * correct. 
+	 */
+	void (*list_members) (const struct ip_set *set,
+			      void *data);
+
+	char typename[IP_SET_MAXNAMELEN];
+	unsigned char features;
+	int protocol_version;
+
+	/* Set this to THIS_MODULE if you are a module, otherwise NULL */
+	struct module *me;
+};
+
+extern int ip_set_register_set_type(struct ip_set_type *set_type);
+extern void ip_set_unregister_set_type(struct ip_set_type *set_type);
+
+/* A generic ipset */
+struct ip_set {
+	char name[IP_SET_MAXNAMELEN];	/* the name of the set */
+	rwlock_t lock;			/* lock for concurrency control */
+	ip_set_id_t id;			/* set id for swapping */
+	ip_set_id_t binding;		/* default binding for the set */
+	atomic_t ref;			/* in kernel and in hash references */
+	struct ip_set_type *type; 	/* the set types */
+	void *data;			/* pooltype specific data */
+};
+
+/* Structure to bind set elements to sets */
+struct ip_set_hash {
+	struct list_head list;		/* list of clashing entries in hash */
+	ip_set_ip_t ip;			/* ip from set */
+	ip_set_id_t id;			/* set id */
+	ip_set_id_t binding;		/* set we bind the element to */
+};
+
+/* register and unregister set references */
+extern ip_set_id_t ip_set_get_byname(const char name[IP_SET_MAXNAMELEN]);
+extern ip_set_id_t ip_set_get_byindex(ip_set_id_t id);
+extern void ip_set_put(ip_set_id_t id);
+
+/* API for iptables set match, and SET target */
+extern void ip_set_addip_kernel(ip_set_id_t id,
+				const struct sk_buff *skb,
+				const u_int32_t *flags);
+extern void ip_set_delip_kernel(ip_set_id_t id,
+				const struct sk_buff *skb,
+				const u_int32_t *flags);
+extern int ip_set_testip_kernel(ip_set_id_t id,
+				const struct sk_buff *skb,
+				const u_int32_t *flags);