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

/*

 * 25-Jul-1998 Major changes to allow for ip chain table

 *

 * 3-Jan-2000 Named tables to allow packet selection for different uses.

 */

/*

 * 	Format of an IP firewall descriptor

 *

 * 	src, dst, src_mask, dst_mask are always stored in network byte order.

 * 	flags are stored in host byte order (of course).

 * 	Port numbers are stored in HOST byte order.

 */

#ifndef _IPTABLES_H

#define _IPTABLES_H

#include <linux/types.h>

#include <linux/if.h>

#include <linux/netfilter_ipv4.h>

#include <linux/netfilter/x_tables.h>

#define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN

#define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN

#define ipt_match xt_match

#define ipt_target xt_target

#define ipt_table xt_table

#define ipt_get_revision xt_get_revision

#define ipt_entry_match xt_entry_match

#define ipt_entry_target xt_entry_target

#define ipt_standard_target xt_standard_target

#define ipt_error_target xt_error_target

#define ipt_counters xt_counters

#define IPT_CONTINUE XT_CONTINUE

#define IPT_RETURN XT_RETURN

/* This group is older than old (iptables < v1.4.0-rc1~89) */

#include <linux/netfilter/xt_tcpudp.h>

#define ipt_udp xt_udp

#define ipt_tcp xt_tcp

#define IPT_TCP_INV_SRCPT	XT_TCP_INV_SRCPT

#define IPT_TCP_INV_DSTPT	XT_TCP_INV_DSTPT

#define IPT_TCP_INV_FLAGS	XT_TCP_INV_FLAGS

#define IPT_TCP_INV_OPTION	XT_TCP_INV_OPTION

#define IPT_TCP_INV_MASK	XT_TCP_INV_MASK

#define IPT_UDP_INV_SRCPT	XT_UDP_INV_SRCPT

#define IPT_UDP_INV_DSTPT	XT_UDP_INV_DSTPT

#define IPT_UDP_INV_MASK	XT_UDP_INV_MASK

/* The argument to IPT_SO_ADD_COUNTERS. */

#define ipt_counters_info xt_counters_info

/* Standard return verdict, or do jump. */

#define IPT_STANDARD_TARGET XT_STANDARD_TARGET

/* Error verdict. */

#define IPT_ERROR_TARGET XT_ERROR_TARGET

/* fn returns 0 to continue iteration */

#define IPT_MATCH_ITERATE(e, fn, args...) \

	XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)

/* fn returns 0 to continue iteration */

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

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

/* Yes, Virginia, you have to zero the padding. */

struct ipt_ip {

	/* Source and destination IP addr */

	struct in_addr src, dst;

	/* Mask for src and dest IP addr */

	struct in_addr smsk, dmsk;

	char iniface[IFNAMSIZ], outiface[IFNAMSIZ];

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

	/* Protocol, 0 = ANY */

	__u16 proto;

	/* Flags word */

	__u8 flags;

	/* Inverse flags */

	__u8 invflags;

};

/* Values for "flag" field in struct ipt_ip (general ip structure). */

#define IPT_F_FRAG		0x01	/* Set if rule is a fragment rule */

#define IPT_F_GOTO		0x02	/* Set if jump is a goto */

#define IPT_F_MASK		0x03	/* All possible flag bits mask. */

/* Values for "inv" field in struct ipt_ip. */

#define IPT_INV_VIA_IN		0x01	/* Invert the sense of IN IFACE. */

#define IPT_INV_VIA_OUT		0x02	/* Invert the sense of OUT IFACE */

#define IPT_INV_TOS		0x04	/* Invert the sense of TOS. */

#define IPT_INV_SRCIP		0x08	/* Invert the sense of SRC IP. */

#define IPT_INV_DSTIP		0x10	/* Invert the sense of DST OP. */

#define IPT_INV_FRAG		0x20	/* Invert the sense of FRAG. */

#define IPT_INV_PROTO		XT_INV_PROTO

#define IPT_INV_MASK		0x7F	/* All possible flag bits mask. */

/* This structure defines each of the firewall rules.  Consists of 3

   parts which are 1) general IP header stuff 2) match specific

   stuff 3) the target to perform if the rule matches */

struct ipt_entry {

	struct ipt_ip ip;

	/* Mark with fields that we care about. */

	unsigned int nfcache;

	/* Size of ipt_entry + matches */

	__u16 target_offset;

	/* Size of ipt_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 IPT_BASE_CTL		64

#define IPT_SO_SET_REPLACE	(IPT_BASE_CTL)

#define IPT_SO_SET_ADD_COUNTERS	(IPT_BASE_CTL + 1)

#define IPT_SO_SET_MAX		IPT_SO_SET_ADD_COUNTERS

#define IPT_SO_GET_INFO			(IPT_BASE_CTL)

#define IPT_SO_GET_ENTRIES		(IPT_BASE_CTL + 1)

#define IPT_SO_GET_REVISION_MATCH	(IPT_BASE_CTL + 2)

#define IPT_SO_GET_REVISION_TARGET	(IPT_BASE_CTL + 3)

#define IPT_SO_GET_MAX			IPT_SO_GET_REVISION_TARGET

/* ICMP matching stuff */

struct ipt_icmp {

	__u8 type;				/* type to match */

	__u8 code[2];				/* range of code */

	__u8 invflags;				/* Inverse flags */

};

/* Values for "inv" field for struct ipt_icmp. */

#define IPT_ICMP_INV	0x01	/* Invert the sense of type/code test */

/* The argument to IPT_SO_GET_INFO */

struct ipt_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_INET_NUMHOOKS];

	/* Underflow points. */

	unsigned int underflow[NF_INET_NUMHOOKS];

	/* Number of entries */

	unsigned int num_entries;

	/* Size of entries. */

	unsigned int size;

};

/* The argument to IPT_SO_SET_REPLACE. */

struct ipt_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_INET_NUMHOOKS];

	/* Underflow points. */

	unsigned int underflow[NF_INET_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 ipt_entry entries[0];

};

/* The argument to IPT_SO_GET_ENTRIES. */

struct ipt_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 ipt_entry entrytable[0];

};

/* Helper functions */

static __inline__ struct xt_entry_target *

ipt_get_target(struct ipt_entry *e)

{

	return (struct xt_entry_target *)((char *)e + e->target_offset);

}

/*

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

 */

#endif /* _IPTABLES_H */