xt_policy.h

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#ifndef _XT_POLICY_H
#define _XT_POLICY_H

#include <linux/types.h>

#define XT_POLICY_MAX_ELEM  4

enum xt_policy_flags {
    XT_POLICY_MATCH_IN  = 0x1,
    XT_POLICY_MATCH_OUT = 0x2,
    XT_POLICY_MATCH_NONE    = 0x4,
    XT_POLICY_MATCH_STRICT  = 0x8,
};

enum xt_policy_modes {
    XT_POLICY_MODE_TRANSPORT,
    XT_POLICY_MODE_TUNNEL
};

struct xt_policy_spec {
    __u8    saddr:1,
            daddr:1,
            proto:1,
            mode:1,
            spi:1,
            reqid:1;
};

#ifndef __KERNEL__
union xt_policy_addr {
    struct in_addr  a4;
    struct in6_addr a6;
};
#endif

struct xt_policy_elem {
    union {
#ifdef __KERNEL__
        struct {
            union nf_inet_addr saddr;
            union nf_inet_addr smask;
            union nf_inet_addr daddr;
            union nf_inet_addr dmask;
        };
#else
        struct {
            union xt_policy_addr saddr;
            union xt_policy_addr smask;
            union xt_policy_addr daddr;
            union xt_policy_addr dmask;
        };
#endif
    };
    __be32          spi;
    __u32       reqid;
    __u8        proto;
    __u8        mode;

    struct xt_policy_spec   match;
    struct xt_policy_spec   invert;
};

struct xt_policy_info {
    struct xt_policy_elem pol[XT_POLICY_MAX_ELEM];
    __u16 flags;
    __u16 len;
};

#endif /* _XT_POLICY_H */