/*

 * 	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

#include <linux/types.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_entry_target xt_entry_target

#define arpt_standard_target xt_standard_target

#define arpt_error_target xt_error_target

#define ARPT_CONTINUE XT_CONTINUE

#define ARPT_RETURN XT_RETURN

#define arpt_counters_info xt_counters_info

#define arpt_counters xt_counters

#define ARPT_STANDARD_TARGET XT_STANDARD_TARGET

#define ARPT_ERROR_TARGET XT_ERROR_TARGET

#define ARPT_ENTRY_ITERATE(entries, size, fn, args...) \

	XT_ENTRY_ITERATE(struct arpt_entry, entries, size, fn, ## args)

#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 */

	__u8 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 */

	__u8 flags;

	/* Inverse flags */

	__u16 invflags;

};

/* 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 */

	__u16 target_offset;

	/* Size of arpt_entry + matches + target */

	__u16 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)

/* The argument to ARPT_SO_GET_INFO */

struct arpt_getinfo {

	/* Which table: caller fills this in. */

	char name[XT_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[XT_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 *counters;

	/* The entries (hang off end: not really an array). */

	struct arpt_entry entries[0];

};

/* The argument to ARPT_SO_GET_ENTRIES. */

struct arpt_get_entries {

	/* Which table: user fills this in. */

	char name[XT_TABLE_MAXNAMELEN];

	/* User fills this in: total entry size. */

	unsigned int size;

	/* The entries. */

	struct arpt_entry entrytable[0];

};

/* Helper functions */

static __inline__ struct xt_entry_target *arpt_get_target(struct arpt_entry *e)

{

	return (void *)e + e->target_offset;

}

/*

 *	Main firewall chains definitions and global var's definitions.

 */

#endif /* _ARPTABLES_H */