root/include/uapi/linux/netfilter/nf_conntrack_tuple_common.h

INCLUDED FROM

#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 */