[net-next-2.6.git] / include / linux / netfilter_arp / arp_tables.h

/*
 * 	Format of an ARP firewall descriptor
 *
 * 	src, tgt, src_mask, tgt_mask, arpop, arpop_mask are always stored in
 *	network byte order.
 * 	flags are stored in host byte order (of course).
 */

#ifndef _ARPTABLES_H
#define _ARPTABLES_H

#ifdef __KERNEL__
#include <linux/if.h>
#include <linux/in.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#endif
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/netfilter_arp.h>

#include <linux/netfilter/x_tables.h>

#define ARPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
#define ARPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN

#define ARPT_DEV_ADDR_LEN_MAX 16

struct arpt_devaddr_info {
	char addr[ARPT_DEV_ADDR_LEN_MAX];
	char mask[ARPT_DEV_ADDR_LEN_MAX];
};

/* Yes, Virginia, you have to zero the padding. */
struct arpt_arp {
	/* Source and target IP addr */
	struct in_addr src, tgt;
	/* Mask for src and target IP addr */
	struct in_addr smsk, tmsk;

	/* Device hw address length, src+target device addresses */
	u_int8_t arhln, arhln_mask;
	struct arpt_devaddr_info src_devaddr;
	struct arpt_devaddr_info tgt_devaddr;

	/* ARP operation code. */
	__be16 arpop, arpop_mask;

	/* ARP hardware address and protocol address format. */
	__be16 arhrd, arhrd_mask;
	__be16 arpro, arpro_mask;

	/* The protocol address length is only accepted if it is 4
	 * so there is no use in offering a way to do filtering on it.
	 */

	char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
	unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];

	/* Flags word */
	u_int8_t flags;
	/* Inverse flags */
	u_int16_t invflags;
};

#define arpt_entry_target xt_entry_target
#define arpt_standard_target xt_standard_target

/* Values for "flag" field in struct arpt_ip (general arp structure).
 * No flags defined yet.
 */
#define ARPT_F_MASK		0x00	/* All possible flag bits mask. */

/* Values for "inv" field in struct arpt_arp. */
#define ARPT_INV_VIA_IN		0x0001	/* Invert the sense of IN IFACE. */
#define ARPT_INV_VIA_OUT	0x0002	/* Invert the sense of OUT IFACE */
#define ARPT_INV_SRCIP		0x0004	/* Invert the sense of SRC IP. */
#define ARPT_INV_TGTIP		0x0008	/* Invert the sense of TGT IP. */
#define ARPT_INV_SRCDEVADDR	0x0010	/* Invert the sense of SRC DEV ADDR. */
#define ARPT_INV_TGTDEVADDR	0x0020	/* Invert the sense of TGT DEV ADDR. */
#define ARPT_INV_ARPOP		0x0040	/* Invert the sense of ARP OP. */
#define ARPT_INV_ARPHRD		0x0080	/* Invert the sense of ARP HRD. */
#define ARPT_INV_ARPPRO		0x0100	/* Invert the sense of ARP PRO. */
#define ARPT_INV_ARPHLN		0x0200	/* Invert the sense of ARP HLN. */
#define ARPT_INV_MASK		0x03FF	/* All possible flag bits mask. */

/* This structure defines each of the firewall rules.  Consists of 3
   parts which are 1) general ARP header stuff 2) match specific
   stuff 3) the target to perform if the rule matches */
struct arpt_entry
{
	struct arpt_arp arp;

	/* Size of arpt_entry + matches */
	u_int16_t target_offset;
	/* Size of arpt_entry + matches + target */
	u_int16_t next_offset;

	/* Back pointer */
	unsigned int comefrom;

	/* Packet and byte counters. */
	struct xt_counters counters;

	/* The matches (if any), then the target. */
	unsigned char elems[0];
};

/*
 * New IP firewall options for [gs]etsockopt at the RAW IP level.
 * Unlike BSD Linux inherits IP options so you don't have to use a raw
 * socket for this. Instead we check rights in the calls.
 *
 * ATTENTION: check linux/in.h before adding new number here.
 */
#define ARPT_BASE_CTL		96

#define ARPT_SO_SET_REPLACE		(ARPT_BASE_CTL)
#define ARPT_SO_SET_ADD_COUNTERS	(ARPT_BASE_CTL + 1)
#define ARPT_SO_SET_MAX			ARPT_SO_SET_ADD_COUNTERS

#define ARPT_SO_GET_INFO		(ARPT_BASE_CTL)
#define ARPT_SO_GET_ENTRIES		(ARPT_BASE_CTL + 1)
/* #define ARPT_SO_GET_REVISION_MATCH	(APRT_BASE_CTL + 2) */
#define ARPT_SO_GET_REVISION_TARGET	(ARPT_BASE_CTL + 3)
#define ARPT_SO_GET_MAX			(ARPT_SO_GET_REVISION_TARGET)

/* CONTINUE verdict for targets */
#define ARPT_CONTINUE XT_CONTINUE

/* For standard target */
#define ARPT_RETURN XT_RETURN

/* The argument to ARPT_SO_GET_INFO */
struct arpt_getinfo {
	/* Which table: caller fills this in. */
	char name[ARPT_TABLE_MAXNAMELEN];

	/* Kernel fills these in. */
	/* Which hook entry points are valid: bitmask */
	unsigned int valid_hooks;

	/* Hook entry points: one per netfilter hook. */
	unsigned int hook_entry[NF_ARP_NUMHOOKS];

	/* Underflow points. */
	unsigned int underflow[NF_ARP_NUMHOOKS];

	/* Number of entries */
	unsigned int num_entries;

	/* Size of entries. */
	unsigned int size;
};

/* The argument to ARPT_SO_SET_REPLACE. */
struct arpt_replace {
	/* Which table. */
	char name[ARPT_TABLE_MAXNAMELEN];

	/* Which hook entry points are valid: bitmask.  You can't
           change this. */
	unsigned int valid_hooks;

	/* Number of entries */
	unsigned int num_entries;

	/* Total size of new entries */
	unsigned int size;

	/* Hook entry points. */
	unsigned int hook_entry[NF_ARP_NUMHOOKS];

	/* Underflow points. */
	unsigned int underflow[NF_ARP_NUMHOOKS];

	/* Information about old entries: */
	/* Number of counters (must be equal to current number of entries). */
	unsigned int num_counters;
	/* The old entries' counters. */
	struct xt_counters __user *counters;

	/* The entries (hang off end: not really an array). */
	struct arpt_entry entries[0];
};

/* The argument to ARPT_SO_ADD_COUNTERS. */
#define arpt_counters_info xt_counters_info
#define arpt_counters xt_counters

/* The argument to ARPT_SO_GET_ENTRIES. */
struct arpt_get_entries {
	/* Which table: user fills this in. */
	char name[ARPT_TABLE_MAXNAMELEN];

	/* User fills this in: total entry size. */
	unsigned int size;

	/* The entries. */
	struct arpt_entry entrytable[0];
};

/* Standard return verdict, or do jump. */
#define ARPT_STANDARD_TARGET XT_STANDARD_TARGET
/* Error verdict. */
#define ARPT_ERROR_TARGET XT_ERROR_TARGET

/* Helper functions */
static __inline__ struct arpt_entry_target *arpt_get_target(struct arpt_entry *e)
{
	return (void *)e + e->target_offset;
}

/* fn returns 0 to continue iteration */
#define ARPT_ENTRY_ITERATE(entries, size, fn, args...) \
	XT_ENTRY_ITERATE(struct arpt_entry, entries, size, fn, ## args)

/*
 *	Main firewall chains definitions and global var's definitions.
 */
#ifdef __KERNEL__

/* Standard entry. */
struct arpt_standard {
	struct arpt_entry entry;
	struct arpt_standard_target target;
};

struct arpt_error_target {
	struct arpt_entry_target target;
	char errorname[ARPT_FUNCTION_MAXNAMELEN];
};

struct arpt_error {
	struct arpt_entry entry;
	struct arpt_error_target target;
};

#define ARPT_ENTRY_INIT(__size)						       \
{									       \
	.target_offset	= sizeof(struct arpt_entry),			       \
	.next_offset	= (__size),					       \
}

#define ARPT_STANDARD_INIT(__verdict)					       \
{									       \
	.entry		= ARPT_ENTRY_INIT(sizeof(struct arpt_standard)),       \
	.target		= XT_TARGET_INIT(ARPT_STANDARD_TARGET,		       \
					 sizeof(struct arpt_standard_target)), \
	.target.verdict	= -(__verdict) - 1,				       \
}

#define ARPT_ERROR_INIT							       \
{									       \
	.entry		= ARPT_ENTRY_INIT(sizeof(struct arpt_error)),	       \
	.target		= XT_TARGET_INIT(ARPT_ERROR_TARGET,		       \
					 sizeof(struct arpt_error_target)),    \
	.target.errorname = "ERROR",					       \
}

extern struct xt_table *arpt_register_table(struct net *net,
					    const struct xt_table *table,
					    const struct arpt_replace *repl);
extern void arpt_unregister_table(struct xt_table *table);
extern unsigned int arpt_do_table(struct sk_buff *skb,
				  unsigned int hook,
				  const struct net_device *in,
				  const struct net_device *out,
				  struct xt_table *table);

#define ARPT_ALIGN(s) XT_ALIGN(s)

#ifdef CONFIG_COMPAT
#include <net/compat.h>

struct compat_arpt_entry {
	struct arpt_arp arp;
	u_int16_t target_offset;
	u_int16_t next_offset;
	compat_uint_t comefrom;
	struct compat_xt_counters counters;
	unsigned char elems[0];
};

static inline struct arpt_entry_target *
compat_arpt_get_target(struct compat_arpt_entry *e)
{
	return (void *)e + e->target_offset;
}

#define COMPAT_ARPT_ALIGN(s)	COMPAT_XT_ALIGN(s)

/* fn returns 0 to continue iteration */
#define COMPAT_ARPT_ENTRY_ITERATE(entries, size, fn, args...) \
	XT_ENTRY_ITERATE(struct compat_arpt_entry, entries, size, fn, ## args)

#define COMPAT_ARPT_ENTRY_ITERATE_CONTINUE(entries, size, n, fn, args...) \
	XT_ENTRY_ITERATE_CONTINUE(struct compat_arpt_entry, entries, size, n, \
				  fn, ## args)

#endif /* CONFIG_COMPAT */
#endif /*__KERNEL__*/
#endif /* _ARPTABLES_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Format of an ARP firewall descriptor
	3	*
	4	* src, tgt, src_mask, tgt_mask, arpop, arpop_mask are always stored in
	5	* network byte order.
	6	* flags are stored in host byte order (of course).
	7	*/
	8
	9	#ifndef _ARPTABLES_H
	10	#define _ARPTABLES_H
	11
	12	#ifdef __KERNEL__
	13	#include <linux/if.h>
1da177e4 LT	14	#include <linux/in.h>
	15	#include <linux/if_arp.h>
	16	#include <linux/skbuff.h>
	17	#endif
c8942f1f	18	#include <linux/types.h>
1da177e4 LT	19	#include <linux/compiler.h>
	20	#include <linux/netfilter_arp.h>
	21
2e4e6a17 HW	22	#include <linux/netfilter/x_tables.h>
	23
	24	#define ARPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
	25	#define ARPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
1da177e4 LT	26
	27	#define ARPT_DEV_ADDR_LEN_MAX 16
	28
	29	struct arpt_devaddr_info {
	30	char addr[ARPT_DEV_ADDR_LEN_MAX];
	31	char mask[ARPT_DEV_ADDR_LEN_MAX];
	32	};
	33
	34	/* Yes, Virginia, you have to zero the padding. */
	35	struct arpt_arp {
	36	/* Source and target IP addr */
	37	struct in_addr src, tgt;
	38	/* Mask for src and target IP addr */
	39	struct in_addr smsk, tmsk;
	40
	41	/* Device hw address length, src+target device addresses */
	42	u_int8_t arhln, arhln_mask;
	43	struct arpt_devaddr_info src_devaddr;
	44	struct arpt_devaddr_info tgt_devaddr;
	45
	46	/* ARP operation code. */
59b8bfd8	47	__be16 arpop, arpop_mask;
1da177e4 LT	48
1da177e4 LT	49	/* ARP hardware address and protocol address format. */
59b8bfd8 AV	50	__be16 arhrd, arhrd_mask;
59b8bfd8 AV	51	__be16 arpro, arpro_mask;
1da177e4 LT	52
	53	/* The protocol address length is only accepted if it is 4
	54	* so there is no use in offering a way to do filtering on it.
	55	*/
	56
	57	char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
	58	unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
	59
	60	/* Flags word */
	61	u_int8_t flags;
	62	/* Inverse flags */
	63	u_int16_t invflags;
	64	};
	65
1e30a014 DM	66	#define arpt_entry_target xt_entry_target
1e30a014 DM	67	#define arpt_standard_target xt_standard_target
1da177e4	68
1da177e4 LT	69	/* Values for "flag" field in struct arpt_ip (general arp structure).
	70	* No flags defined yet.
	71	*/
	72	#define ARPT_F_MASK 0x00 /* All possible flag bits mask. */
	73
	74	/* Values for "inv" field in struct arpt_arp. */
	75	#define ARPT_INV_VIA_IN 0x0001 /* Invert the sense of IN IFACE. */
	76	#define ARPT_INV_VIA_OUT 0x0002 /* Invert the sense of OUT IFACE */
	77	#define ARPT_INV_SRCIP 0x0004 /* Invert the sense of SRC IP. */
	78	#define ARPT_INV_TGTIP 0x0008 /* Invert the sense of TGT IP. */
	79	#define ARPT_INV_SRCDEVADDR 0x0010 /* Invert the sense of SRC DEV ADDR. */
	80	#define ARPT_INV_TGTDEVADDR 0x0020 /* Invert the sense of TGT DEV ADDR. */
	81	#define ARPT_INV_ARPOP 0x0040 /* Invert the sense of ARP OP. */
	82	#define ARPT_INV_ARPHRD 0x0080 /* Invert the sense of ARP HRD. */
	83	#define ARPT_INV_ARPPRO 0x0100 /* Invert the sense of ARP PRO. */
	84	#define ARPT_INV_ARPHLN 0x0200 /* Invert the sense of ARP HLN. */
	85	#define ARPT_INV_MASK 0x03FF /* All possible flag bits mask. */
	86
	87	/* This structure defines each of the firewall rules. Consists of 3
	88	parts which are 1) general ARP header stuff 2) match specific
	89	stuff 3) the target to perform if the rule matches */
	90	struct arpt_entry
	91	{
	92	struct arpt_arp arp;
	93
	94	/* Size of arpt_entry + matches */
	95	u_int16_t target_offset;
	96	/* Size of arpt_entry + matches + target */
	97	u_int16_t next_offset;
	98
	99	/* Back pointer */
	100	unsigned int comefrom;
	101
	102	/* Packet and byte counters. */
2e4e6a17	103	struct xt_counters counters;
1da177e4 LT	104
	105	/* The matches (if any), then the target. */
	106	unsigned char elems[0];
	107	};
	108
	109	/*
	110	* New IP firewall options for [gs]etsockopt at the RAW IP level.
	111	* Unlike BSD Linux inherits IP options so you don't have to use a raw
	112	* socket for this. Instead we check rights in the calls.
b96e7ecb YK	113	*
b96e7ecb YK	114	* ATTENTION: check linux/in.h before adding new number here.
1da177e4	115	*/
b96e7ecb YK	116	#define ARPT_BASE_CTL 96
	117
	118	#define ARPT_SO_SET_REPLACE (ARPT_BASE_CTL)
	119	#define ARPT_SO_SET_ADD_COUNTERS (ARPT_BASE_CTL + 1)
	120	#define ARPT_SO_SET_MAX ARPT_SO_SET_ADD_COUNTERS
	121
	122	#define ARPT_SO_GET_INFO (ARPT_BASE_CTL)
	123	#define ARPT_SO_GET_ENTRIES (ARPT_BASE_CTL + 1)
	124	/* #define ARPT_SO_GET_REVISION_MATCH (APRT_BASE_CTL + 2) */
	125	#define ARPT_SO_GET_REVISION_TARGET (ARPT_BASE_CTL + 3)
	126	#define ARPT_SO_GET_MAX (ARPT_SO_GET_REVISION_TARGET)
1da177e4 LT	127
1da177e4 LT	128	/* CONTINUE verdict for targets */
2e4e6a17	129	#define ARPT_CONTINUE XT_CONTINUE
1da177e4 LT	130
1da177e4 LT	131	/* For standard target */
2e4e6a17	132	#define ARPT_RETURN XT_RETURN
1da177e4 LT	133
1da177e4 LT	134	/* The argument to ARPT_SO_GET_INFO */
d94d9fee	135	struct arpt_getinfo {
1da177e4 LT	136	/* Which table: caller fills this in. */
	137	char name[ARPT_TABLE_MAXNAMELEN];
	138
	139	/* Kernel fills these in. */
	140	/* Which hook entry points are valid: bitmask */
	141	unsigned int valid_hooks;
	142
	143	/* Hook entry points: one per netfilter hook. */
	144	unsigned int hook_entry[NF_ARP_NUMHOOKS];
	145
	146	/* Underflow points. */
	147	unsigned int underflow[NF_ARP_NUMHOOKS];
	148
	149	/* Number of entries */
	150	unsigned int num_entries;
	151
	152	/* Size of entries. */
	153	unsigned int size;
	154	};
	155
	156	/* The argument to ARPT_SO_SET_REPLACE. */
d94d9fee	157	struct arpt_replace {
1da177e4 LT	158	/* Which table. */
	159	char name[ARPT_TABLE_MAXNAMELEN];
	160
	161	/* Which hook entry points are valid: bitmask. You can't
	162	change this. */
	163	unsigned int valid_hooks;
	164
	165	/* Number of entries */
	166	unsigned int num_entries;
	167
	168	/* Total size of new entries */
	169	unsigned int size;
	170
	171	/* Hook entry points. */
	172	unsigned int hook_entry[NF_ARP_NUMHOOKS];
	173
	174	/* Underflow points. */
	175	unsigned int underflow[NF_ARP_NUMHOOKS];
	176
	177	/* Information about old entries: */
	178	/* Number of counters (must be equal to current number of entries). */
	179	unsigned int num_counters;
	180	/* The old entries' counters. */
2e4e6a17	181	struct xt_counters __user *counters;
1da177e4 LT	182
	183	/* The entries (hang off end: not really an array). */
	184	struct arpt_entry entries[0];
	185	};
	186
	187	/* The argument to ARPT_SO_ADD_COUNTERS. */
2e4e6a17	188	#define arpt_counters_info xt_counters_info
8c82d8df	189	#define arpt_counters xt_counters
1da177e4 LT	190
1da177e4 LT	191	/* The argument to ARPT_SO_GET_ENTRIES. */
d94d9fee	192	struct arpt_get_entries {
1da177e4 LT	193	/* Which table: user fills this in. */
	194	char name[ARPT_TABLE_MAXNAMELEN];
	195
	196	/* User fills this in: total entry size. */
	197	unsigned int size;
	198
	199	/* The entries. */
	200	struct arpt_entry entrytable[0];
	201	};
	202
	203	/* Standard return verdict, or do jump. */
2e4e6a17	204	#define ARPT_STANDARD_TARGET XT_STANDARD_TARGET
1da177e4	205	/* Error verdict. */
2e4e6a17	206	#define ARPT_ERROR_TARGET XT_ERROR_TARGET
1da177e4 LT	207
	208	/* Helper functions */
	209	static __inline__ struct arpt_entry_target arpt_get_target(struct arpt_entry e)
	210	{
	211	return (void *)e + e->target_offset;
	212	}
	213
	214	/* fn returns 0 to continue iteration */
89c002d6 PM	215	#define ARPT_ENTRY_ITERATE(entries, size, fn, args...) \
89c002d6 PM	216	XT_ENTRY_ITERATE(struct arpt_entry, entries, size, fn, ## args)
1da177e4 LT	217
	218	/*
	219	* Main firewall chains definitions and global var's definitions.
	220	*/
	221	#ifdef __KERNEL__
	222
3c2ad469	223	/* Standard entry. */
d94d9fee	224	struct arpt_standard {
3c2ad469 PM	225	struct arpt_entry entry;
	226	struct arpt_standard_target target;
	227	};
	228
d94d9fee	229	struct arpt_error_target {
3c2ad469 PM	230	struct arpt_entry_target target;
	231	char errorname[ARPT_FUNCTION_MAXNAMELEN];
	232	};
	233
d94d9fee	234	struct arpt_error {
3c2ad469 PM	235	struct arpt_entry entry;
	236	struct arpt_error_target target;
	237	};
	238
	239	#define ARPT_ENTRY_INIT(__size) \
	240	{ \
	241	.target_offset = sizeof(struct arpt_entry), \
	242	.next_offset = (__size), \
	243	}
	244
	245	#define ARPT_STANDARD_INIT(__verdict) \
	246	{ \
	247	.entry = ARPT_ENTRY_INIT(sizeof(struct arpt_standard)), \
	248	.target = XT_TARGET_INIT(ARPT_STANDARD_TARGET, \
	249	sizeof(struct arpt_standard_target)), \
	250	.target.verdict = -(__verdict) - 1, \
	251	}
	252
	253	#define ARPT_ERROR_INIT \
	254	{ \
	255	.entry = ARPT_ENTRY_INIT(sizeof(struct arpt_error)), \
	256	.target = XT_TARGET_INIT(ARPT_ERROR_TARGET, \
	257	sizeof(struct arpt_error_target)), \
	258	.target.errorname = "ERROR", \
	259	}
	260
4abff077	261	extern struct xt_table arpt_register_table(struct net net,
35aad0ff	262	const struct xt_table *table,
4abff077 JE	263	const struct arpt_replace *repl);
4abff077 JE	264	extern void arpt_unregister_table(struct xt_table *table);
3db05fea	265	extern unsigned int arpt_do_table(struct sk_buff *skb,
1da177e4 LT	266	unsigned int hook,
	267	const struct net_device *in,
	268	const struct net_device *out,
4abff077	269	struct xt_table *table);
1da177e4	270
0495cf95	271	#define ARPT_ALIGN(s) XT_ALIGN(s)
d6a2ba07 PM	272
	273	#ifdef CONFIG_COMPAT
	274	#include <net/compat.h>
	275
d94d9fee	276	struct compat_arpt_entry {
d6a2ba07 PM	277	struct arpt_arp arp;
	278	u_int16_t target_offset;
	279	u_int16_t next_offset;
	280	compat_uint_t comefrom;
	281	struct compat_xt_counters counters;
	282	unsigned char elems[0];
	283	};
	284
	285	static inline struct arpt_entry_target *
	286	compat_arpt_get_target(struct compat_arpt_entry *e)
	287	{
	288	return (void *)e + e->target_offset;
	289	}
	290
	291	#define COMPAT_ARPT_ALIGN(s) COMPAT_XT_ALIGN(s)
	292
	293	/* fn returns 0 to continue iteration */
	294	#define COMPAT_ARPT_ENTRY_ITERATE(entries, size, fn, args...) \
	295	XT_ENTRY_ITERATE(struct compat_arpt_entry, entries, size, fn, ## args)
	296
	297	#define COMPAT_ARPT_ENTRY_ITERATE_CONTINUE(entries, size, n, fn, args...) \
	298	XT_ENTRY_ITERATE_CONTINUE(struct compat_arpt_entry, entries, size, n, \
	299	fn, ## args)
	300
	301	#endif /* CONFIG_COMPAT */
1da177e4 LT	302	#endif /__KERNEL__/
1da177e4 LT	303	#endif /* _ARPTABLES_H */