text: /*
   * 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 _UAPI_IP6_TABLES_H
  #define _UAPI_IP6_TABLES_H
  
  #include <linux/types.h>
  #include <linux/compiler.h>
  #include <linux/if.h>
  #include <linux/netfilter_ipv6.h>
  
  #include <linux/netfilter/x_tables.h>
  
  #ifndef __KERNEL__
  #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)
  #endif
  
  /* 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 __user *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 (void *)e + e->target_offset;
  }
  
  /*
   *	Main firewall chains definitions and global var's definitions.
   */
  
  #endif /* _UAPI_IP6_TABLES_H */
  