module packet-fields {
    yang-version 1;

    namespace "urn:ietf:params:xml:ns:yang:packet-fields";

    prefix packet-fields;

    import ietf-inet-types {
        prefix "inet";
    }
                    
    import ietf-yang-types {
        prefix "yang";
    }

    revision 2014-06-25 {
        description "Initial version of packet fields used by access-lists";
    }

    grouping acl-transport-header-fields {
        description "Transport header fields";

        container source-port-range {
             description "inclusive range of source ports";
             leaf lower-port {
                 mandatory true;
                 type inet:port-number;
             }
             leaf upper-port {
                 type inet:port-number;
             }
        }       

        container destination-port-range {
             description "inclusive range of destination ports";
             leaf lower-port {
                 mandatory true;
                 type inet:port-number;
             }
             leaf upper-port {
                 type inet:port-number;
             }
        }       
    }

    grouping acl-ip-header-fields {
        description "Header fields common to ipv4 and ipv6";

        uses acl-transport-header-fields;

        leaf dscp {
            type inet:dscp;
        }

        leaf ip-protocol {
            type uint8;
        }

    }

    grouping acl-ipv4-header-fields {
        description "fields in IPv4 header";

        leaf destination-ipv4-address {
            type inet:ipv4-prefix;
        }

        leaf source-ipv4-address {
            type inet:ipv4-prefix;
        }

    }

    grouping acl-ipv6-header-fields {
        description "fields in IPv6 header";

        leaf destination-ipv6-address {
            type inet:ipv6-prefix;
        }

        leaf source-ipv6-address {
            type inet:ipv6-prefix;
        }

        leaf flow-label {
            type inet:ipv6-flow-label;
        }

    }

    grouping acl-eth-header-fields {
        description "fields in ethernet header";

        leaf destination-mac-address {
            type yang:mac-address;
        }

        leaf destination-mac-address-mask {
            type yang:mac-address;
        }

        leaf source-mac-address {
            type yang:mac-address;
        }

        leaf source-mac-address-mask {
            type yang:mac-address;
        }
    }

    grouping timerange {
        description "Define time range entries to restrict 
            the access. The time range is identified by a name 
            and then referenced by a function, so that those 
            time restrictions are imposed on the function itself.";
        
        container absolute {
            description 
                "Absolute time and date that 
                the associated function starts
                going into effect.";
                
            leaf start {
                type yang:date-and-time; 
                description 
                "Start time and date";
            }
            leaf end {
                type yang:date-and-time; 
                description "Absolute end time and date";
            }
            leaf active {
                type boolean;
                default "true";
                description
                    "Specify the associated function
                    active or inactive state when
                    starts going into effect";
            }
        } // container absolute    
    } //grouping timerange

    grouping metadata {
        description "Fields associated with a packet but not in the header";

        leaf input-interface {
             description "Packet was received on this interface";
             type string;
        }
        uses timerange;
    }
}