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/*

 *      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 */