nf_conntrack_tuple_common.h

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#ifndef _NF_CONNTRACK_TUPLE_COMMON_H
#define _NF_CONNTRACK_TUPLE_COMMON_H

enum ip_conntrack_dir {
    IP_CT_DIR_ORIGINAL,
    IP_CT_DIR_REPLY,
    IP_CT_DIR_MAX
};

/* The protocol-specific manipulable parts of the tuple: always in
 * network order
 */
union nf_conntrack_man_proto {
    /* Add other protocols here. */
    __be16 all;

    struct {
        __be16 port;
    } tcp;
    struct {
        __be16 port;
    } udp;
    struct {
        __be16 id;
    } icmp;
    struct {
        __be16 port;
    } dccp;
    struct {
        __be16 port;
    } sctp;
    struct {
        __be16 key; /* GRE key is 32bit, PPtP only uses 16bit */
    } gre;
};

#define CTINFO2DIR(ctinfo) ((ctinfo) >= IP_CT_IS_REPLY ? IP_CT_DIR_REPLY : IP_CT_DIR_ORIGINAL)

#endif /* _NF_CONNTRACK_TUPLE_COMMON_H */