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Edit File : arp_tables.h \| Size : 5.86 KB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / / * 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/if.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 */ Back

Edit File : arp_tables.h | Size : 5.86 KB

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * 	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/if.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 */

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