ipt_conntrack.h

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/* Header file for kernel module to match connection tracking information.
 * GPL (C) 2001  Marc Boucher (marc@mbsi.ca).
 */

#ifndef _IPT_CONNTRACK_H
#define _IPT_CONNTRACK_H

#if 0
#include <linux/netfilter_ipv4/ip_conntrack.h>
#else
#include <linux/netfilter/nf_conntrack_common.h>
#include <linux/netfilter/nf_conntrack_tuple_common.h>
#endif

/* backwards compatibility crap. only exists in userspace - HW */
#include <linux/version.h>
#ifndef KERNEL_VERSION
#define KERNEL_VERSION(a,b,c) (((a) << 16) | ((b) << 8) | (c))
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,18)
#define IPS_EXPECTED    (1 << 0)
#define IPS_SEEN_REPLY  (1 << 1)
#define IPS_ASSURED (1 << 2)
#define IP_CT_DIR_ORIGINAL  0
#define IP_CT_DIR_REPLY     1
#define IP_CT_DIR_MAX       2
#endif

#define IPT_CONNTRACK_STATE_BIT(ctinfo) (1 << ((ctinfo)%IP_CT_IS_REPLY+1))
#define IPT_CONNTRACK_STATE_INVALID (1 << 0)

#define IPT_CONNTRACK_STATE_SNAT (1 << (IP_CT_NUMBER + 1))
#define IPT_CONNTRACK_STATE_DNAT (1 << (IP_CT_NUMBER + 2))
#define IPT_CONNTRACK_STATE_UNTRACKED (1 << (IP_CT_NUMBER + 3))

/* flags, invflags: */
#define IPT_CONNTRACK_STATE 0x01
#define IPT_CONNTRACK_PROTO 0x02
#define IPT_CONNTRACK_ORIGSRC   0x04
#define IPT_CONNTRACK_ORIGDST   0x08
#define IPT_CONNTRACK_REPLSRC   0x10
#define IPT_CONNTRACK_REPLDST   0x20
#define IPT_CONNTRACK_STATUS    0x40
#define IPT_CONNTRACK_EXPIRES   0x80

/* This is exposed to userspace, so remains frozen in time. */
struct ip_conntrack_old_tuple
{
    struct {
        u_int32_t ip;
        union {
            u_int16_t all;
        } u;
    } src;

    struct {
        u_int32_t ip;
        union {
            u_int16_t all;
        } u;

        /* The protocol. */
        u_int16_t protonum;
    } dst;
};

struct ipt_conntrack_info
{
    unsigned int statemask, statusmask;

    struct ip_conntrack_old_tuple tuple[IP_CT_DIR_MAX];
    struct in_addr sipmsk[IP_CT_DIR_MAX], dipmsk[IP_CT_DIR_MAX];

#ifdef KERNEL_64_USERSPACE_32
    unsigned long long expires_min, expires_max;
#else
    unsigned long expires_min, expires_max;
#endif

    /* Flags word */
    u_int8_t flags;
    /* Inverse flags */
    u_int8_t invflags;
};
#endif /*_IPT_CONNTRACK_H*/