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/*

 * 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/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 (void *)e + e->target_offset;

}

/*

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

 */

#endif /* _IP6_TABLES_H */