Subversion Repositories hf-risc

/*

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

}

/*

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

 */

#endif /* _IPTABLES_H */