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Current File : /usr/include/linux/netfilter_ipv6/ip6_tables.h
/* 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 IP6 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 _IP6_TABLES_H
#define _IP6_TABLES_H

#include <linux/types.h>

#include <linux/if.h>
#include <linux/netfilter_ipv6.h>

#include <linux/netfilter/x_tables.h>

#define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
#define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
#define ip6t_match xt_match
#define ip6t_target xt_target
#define ip6t_table xt_table
#define ip6t_get_revision xt_get_revision
#define ip6t_entry_match xt_entry_match
#define ip6t_entry_target xt_entry_target
#define ip6t_standard_target xt_standard_target
#define ip6t_error_target xt_error_target
#define ip6t_counters xt_counters
#define IP6T_CONTINUE XT_CONTINUE
#define IP6T_RETURN XT_RETURN

/* Pre-iptables-1.4.0 */
#include <linux/netfilter/xt_tcpudp.h>
#define ip6t_tcp xt_tcp
#define ip6t_udp xt_udp
#define IP6T_TCP_INV_SRCPT	XT_TCP_INV_SRCPT
#define IP6T_TCP_INV_DSTPT	XT_TCP_INV_DSTPT
#define IP6T_TCP_INV_FLAGS	XT_TCP_INV_FLAGS
#define IP6T_TCP_INV_OPTION	XT_TCP_INV_OPTION
#define IP6T_TCP_INV_MASK	XT_TCP_INV_MASK
#define IP6T_UDP_INV_SRCPT	XT_UDP_INV_SRCPT
#define IP6T_UDP_INV_DSTPT	XT_UDP_INV_DSTPT
#define IP6T_UDP_INV_MASK	XT_UDP_INV_MASK

#define ip6t_counters_info xt_counters_info
#define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
#define IP6T_ERROR_TARGET XT_ERROR_TARGET
#define IP6T_MATCH_ITERATE(e, fn, args...) \
	XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args)
#define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
	XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args)

/* Yes, Virginia, you have to zero the padding. */
struct ip6t_ip6 {
	/* Source and destination IP6 addr */
	struct in6_addr src, dst;		
	/* Mask for src and dest IP6 addr */
	struct in6_addr smsk, dmsk;
	char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
	unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];

	/* Upper protocol number
	 * - The allowed value is 0 (any) or protocol number of last parsable
	 *   header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or
	 *   the non IPv6 extension headers.
	 * - The protocol numbers of IPv6 extension headers except of ESP and
	 *   MH do not match any packets.
	 * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol.
	 */
	__u16 proto;
	/* TOS to match iff flags & IP6T_F_TOS */
	__u8 tos;

	/* Flags word */
	__u8 flags;
	/* Inverse flags */
	__u8 invflags;
};

/* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
#define IP6T_F_PROTO		0x01	/* Set if rule cares about upper 
					   protocols */
#define IP6T_F_TOS		0x02	/* Match the TOS. */
#define IP6T_F_GOTO		0x04	/* Set if jump is a goto */
#define IP6T_F_MASK		0x07	/* All possible flag bits mask. */

/* Values for "inv" field in struct ip6t_ip6. */
#define IP6T_INV_VIA_IN		0x01	/* Invert the sense of IN IFACE. */
#define IP6T_INV_VIA_OUT		0x02	/* Invert the sense of OUT IFACE */
#define IP6T_INV_TOS		0x04	/* Invert the sense of TOS. */
#define IP6T_INV_SRCIP		0x08	/* Invert the sense of SRC IP. */
#define IP6T_INV_DSTIP		0x10	/* Invert the sense of DST OP. */
#define IP6T_INV_FRAG		0x20	/* Invert the sense of FRAG. */
#define IP6T_INV_PROTO		XT_INV_PROTO
#define IP6T_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 ip6t_entry {
	struct ip6t_ip6 ipv6;

	/* 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];
};

/* Standard entry */
struct ip6t_standard {
	struct ip6t_entry entry;
	struct xt_standard_target target;
};

struct ip6t_error {
	struct ip6t_entry entry;
	struct xt_error_target target;
};

#define IP6T_ENTRY_INIT(__size)						       \
{									       \
	.target_offset	= sizeof(struct ip6t_entry),			       \
	.next_offset	= (__size),					       \
}

#define IP6T_STANDARD_INIT(__verdict)					       \
{									       \
	.entry		= IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)),       \
	.target		= XT_TARGET_INIT(XT_STANDARD_TARGET,		       \
					 sizeof(struct xt_standard_target)),   \
	.target.verdict	= -(__verdict) - 1,				       \
}

#define IP6T_ERROR_INIT							       \
{									       \
	.entry		= IP6T_ENTRY_INIT(sizeof(struct ip6t_error)),	       \
	.target		= XT_TARGET_INIT(XT_ERROR_TARGET,		       \
					 sizeof(struct xt_error_target)),      \
	.target.errorname = "ERROR",					       \
}

/*
 * 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/in6.h before adding new number here.
 */
#define IP6T_BASE_CTL			64

#define IP6T_SO_SET_REPLACE		(IP6T_BASE_CTL)
#define IP6T_SO_SET_ADD_COUNTERS	(IP6T_BASE_CTL + 1)
#define IP6T_SO_SET_MAX			IP6T_SO_SET_ADD_COUNTERS

#define IP6T_SO_GET_INFO		(IP6T_BASE_CTL)
#define IP6T_SO_GET_ENTRIES		(IP6T_BASE_CTL + 1)
#define IP6T_SO_GET_REVISION_MATCH	(IP6T_BASE_CTL + 4)
#define IP6T_SO_GET_REVISION_TARGET	(IP6T_BASE_CTL + 5)
#define IP6T_SO_GET_MAX			IP6T_SO_GET_REVISION_TARGET

/* obtain original address if REDIRECT'd connection */
#define IP6T_SO_ORIGINAL_DST            80

/* ICMP matching stuff */
struct ip6t_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 IP6T_ICMP_INV	0x01	/* Invert the sense of type/code test */

/* The argument to IP6T_SO_GET_INFO */
struct ip6t_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 IP6T_SO_SET_REPLACE. */
struct ip6t_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 ip6t_entry entries[0];
};

/* The argument to IP6T_SO_GET_ENTRIES. */
struct ip6t_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 ip6t_entry entrytable[0];
};

/* Helper functions */
static __inline__ struct xt_entry_target *
ip6t_get_target(struct ip6t_entry *e)
{
	return (struct xt_entry_target *)((char *)e + e->target_offset);
}

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

#endif /* _IP6_TABLES_H */

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