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module ietf-sampled-streaming {
  namespace "urn:ietf:params:xml:ns:yang:ietf-sampled-streaming";
  prefix ss;

  import ietf-interfaces {
    prefix if;
  }
  import ietf-inet-types {
    prefix inet;
  }
  import ietf-ipfix-psamp {
    prefix psamp;
    revision-date 2012-09-05;
  }

  organization
    "IETF Working Group";
  contact
    "Editor:    Andrew Gray
     <mailto:Andrew.Gray@charter.com>";
  description
    "This module contains a collection of YANG definitions for
     managing sampled streaming subscriptions.

     Copyright (c) 2019 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject to
     the license terms contained in, the Simplified BSD License set
     forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (https://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC XXXX
     (https://www.rfc-editor.org/info/rfcXXXX); see the RFC itself
     for full legal notices.

     The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
     NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED',
     'MAY', and 'OPTIONAL' in this document are to be interpreted as
     described in BCP 14 (RFC 2119) (RFC 8174) when, and only when,
     they appear in all capitals, as shown here.";

  revision 2019-12-27 {
    description
      "Clarifications based on feedback for -03 draft.  Utilize parts
       of RFC 6728 to avoid redundancy, where possible.";
    reference
      "draft-gray-sampled-streaming-03";
  }
  revision 2019-10-22 {
    description
      "Updates based on feedback for -02 draft: Adding more forwarded
       action-types.  frame-payload changed to be explicit about
       direction.  Added -size types explicitly for frame-payload and
       padding to allow using more than one zero-length field.";
    reference
      "draft-gray-sampled-streaming-02";
  }
  revision 2019-08-06 {
    description
      "Updates based on feedback for -01 draft.";
    reference
      "draft-gray-sampled-streaming-01";
  }
  revision 2019-06-25 {
    description
      "Initial version.";
    reference
      "draft-gray-sampled-streaming-00";
  }

  typedef filter-type {
    type enumeration {
      enum interfaces {
        description
          "List of interfaces to filter against.";
      }
      enum action {
        description
          "Filter against a list of actions that the Point took (i.e.
           only consider packets that were actually forwarded).";
      }
      enum direction {
        description
          "Direction to sample traffic in.";
      }
      enum ip-version {
        description
          "The version number in the IP header.";
      }
      enum ip-v4-srcip {
        description
          "The IPv4 header's source IPv4 address.";
      }
      enum ip-v4-dstip {
        description
          "The IPv4 header's destination IPv4 address.";
      }
      enum ip-v4-ttl {
        description
          "The IPv4 header's Time to Live.";
      }
      enum ip-v4-prot {
        description
          "The IPv4 header's protocol number.";
      }
      enum ip-v6-srcip {
        description
          "The IPv6 header's source IPv4 address.";
      }
      enum ip-v6-dstip {
        description
          "The IPv6 header's destination IPv4 address.";
      }
      enum frame-size {
        description
          "The total size of the frame.";
      }
      enum frame-payload {
        description
          "Specific payload octets.";
      }
      enum frame-length {
        description
          "Specific frame length.";
      }
    }
    description
      "The filtering abilities available.";
  }

  typedef field-type {
    type enumeration {
      enum padding {
        description
          "Padding bits that MUST be ignored.";
      }
      enum padding-size {
        description
          "This packet's length of a variable-length padding field.";
      }
      enum port {
        description
          "An indication of the port the traffic was sampled from.";
      }
      enum direction {
        description
          "Which direction the traffic went.";
      }
      enum port-ingress {
        description
          "What port the traffic was received from (may be different
           than 'port')";
      }
      enum port-egress {
        description
          "What port the traffic is leaving on (may be different than
           'port')";
      }
      enum timestamp-msec-ingress {
        description
          "The timestamp the packet was received at, in integer
           milliseconds.  The epoch of this number is provided in the
           timestamp container of the returned field information.";
      }
      enum timestamp-usec-ingress {
        description
          "The timestamp the packet was received at, in integer
           microseconds.  The epoch of this number is provided in the
           timestamp container of the returned field information.";
      }
      enum timestamp-nsec-ingress {
        description
          "The timestamp the packet was received at, in integer
           nanoseconds.  The epoch of this number is provided in the
           timestamp container of the returned field information.";
      }
      enum timestamp-msec-egress {
        description
          "The timestamp the packet left the point at, in integer
           milliseconds.  The epoch of this number is provided in the
           timestamp container of the returned field information.";
      }
      enum timestamp-usec-egress {
        description
          "The timestamp the packet left the point at, in integer
           microseconds.  The epoch of this number is provided in the
           timestamp container of the returned field information.";
      }
      enum timestamp-nsec-egress {
        description
          "The timestamp the packet left the point at, in integer
           nanoseconds.  The epoch of this number is provided in the
           timestamp container of the returned field information.";
      }
      enum frame-length {
        description
          "The generic frame length.  Note that due to chipset
           capabilities, this MAY not be the same as the captured
           packet length.";
      }
      enum frame-length-ingress {
        description
          "The frame length as received by the point.  Note that due
           to chipset capabilities, this MAY not be the same as the
           captured packet length.";
      }
      enum frame-length-egress {
        description
          "The frame length after local processing, as it leaves the
           point.  Note that due to chipset capabilities, this MAY
           not be the same as the captured packet length.";
      }
      enum frame-payload-size {
        description
          "The length of the payload that has actually been copied
           into this stream.";
      }
      enum frame-payload-ingress {
        description
          "The payload of the frame, as received the point.";
      }
      enum frame-payload-egress {
        description
          "The payload of the frame, as it leaves the point.";
      }
      enum action {
        description
          "The action that was taken on this frame.  Values are
           mapped as according to action-type.";
      }
    }
    description
      "Types of data included in the data stream provided back to
       the receiver.  Note that all fields MAY not be provided.";
  }

  typedef action-type {
    type enumeration {
      enum forwarded {
        description
          "Generically forwarded normally through the system.  A more
           specific action type code SHOULD be used.";
      }
      enum forwarded-label-change {
        description
          "Forwarded, with a generic MPLS label change having
           occurred.";
      }
      enum forwarded-label-swap {
        description
          "Forwarded, with a MPLS label swap.";
      }
      enum forwarded-label-pop {
        description
          "Forwarded, with a MPLS label pop.";
      }
      enum forwarded-label-push {
        description
          "Forwarded, with a MPLS label push.";
      }
      enum forwarded-cpu-punt {
        description
          "Forwarded after a CPU punt.";
      }
      enum forwarded-tunnel {
        description
          "Forwarded with additional outer wrapper for tunneling.";
      }
      enum forwarded-tunnel-frr {
        description
          "Forwarded with additional outer wrapper due to fast
           reroute.";
      }
      enum dropped {
        description
          "Generically dropped.  A more specific action type code
           SHOULD be used.";
      }
      enum dropped-rate-limit {
        description
          "Dropped due to a rate limiter applied.";
      }
      enum dropped-buffer {
        description
          "Dropped due to no buffer space.";
      }
      enum dropped-security {
        description
          "Dropped due to a security policy.";
      }
      enum dropped-error {
        description
          "Dropped due to the frame being in error.";
      }
      enum dropped-cpu-punt {
        description
          "Dropped after a CPU punt.";
      }
      enum passed-to-cpu {
        description
          "Passed on to the CPU, but what the CPU did with it is
           unknown.";
      }
    }
    description
      "Possible actions taken on a packet.";
  }

  typedef destination-type {
    type enumeration {
      enum udp {
        description
          "Sent with a UDP header.";
      }
    }
    description
      "Different possible destination types.";
  }

  typedef status-type {
    type enumeration {
      enum client-request-complete {
        description
          "The Client has completed its request setup.";
      }
      enum replicator-proposals-available {
        description
          "The Replicator has finished processing the request, and
           has proposals available in the 'proposals' branch.";
      }
      enum replicator-proposal-error {
        description
          "The Replicator encountered an error attempting to come up
           with a proposal.  'proposal-error' MAY contain an
           explanation.";
      }
      enum client-proposal-selected {
        description
          "The Client has updated 'proposal-selected' and is ready
           for the Replicator to install the requested sampling.";
      }
      enum replicator-install-success {
        description
          "The Replicator has successfully activated the sampling,
           and it is operating.";
      }
      enum replicator-install-error {
        description
          "The Replicator encountered an error installing the
           sampling. 'install-error' MAY contain an explanation.";
      }
    }
    description
      "The status of a sampler entry.";
  }

  typedef frame-headers {
    type bits {
      bit eth-l1-preamble {
        position 0;
        description
          "Will include the Ethernet preamble.";
      }
      bit eth-l1-sof {
        position 1;
        description
          "Will include the Ethernet start of frame
           delimiter";
      }
      bit eth-l2-dmac {
        position 2;
        description
          "Will include the outer Ethernet destination MAC.";
      }
      bit eth-l2-smac {
        position 3;
        description
          "Will include the outer Ethernet source MAC.";
      }
      bit eth-l2-vlan {
        position 4;
        description
          "Will include any 802.1Q-2018 VLAN tags.";
      }
      bit eth-l2-type {
        position 5;
        description
          "Will include the Ethertype or size.";
      }
      bit eth-l2-fcs {
        position 6;
        description
          "Will include the Frame Check Sequence after the
           payload.";
      }
      bit eth-l1-ipg {
        position 7;
        description
          "Will include the inter-packet gap.  Be aware that
           different Ethernet speeds may have different lengths.";
      }
      bit mpls-tags {
        position 8;
        description
          "Will include MPLS tags.";
      }
    }
    description
      "Listing of fields to be provided in a frame capture.";
  }

  grouping filters {
    description
      "Filter definition.  Multiple filters are ANDed.";
    leaf name {
      type string {
        length "1..255";
      }
      description
        "A name for this filter.";
    }
    list interfaces {
      when "../type = 'interfaces'";
      key "int";
      description
        "Filter down to only this list of interfaces.";
      leaf int {
        type if:interface-ref;
        description
          "A specific interface to filter against.";
      }
    }
    list actions {
      when "../type = 'action'";
      key "action";
      description
        "Filter down to only this list of actions.";
      leaf action {
        type action-type;
        description
          "One specific action code.";
      }
    }
    leaf direction {
      when "../type = 'direction'";
      type psamp:direction;
      description
        "Which direction(s) to sample traffic in.";
    }
    leaf type {
      type filter-type;
      mandatory true;
      description
        "The type of filter associated.";
    }
    leaf ipv4-address {
      when "../type = 'ip-v4-srcip' | ../type = 'ip-v4-dstip'";
      type inet:ipv4-address-no-zone;
      description
        "The IPv4 address to filter on.";
    }
    leaf ipv6-address {
      when "../type = 'ip-v6-srcip' | ../type = 'ip-v6-dstip'";
      type inet:ipv6-address-no-zone;
      description
        "The IPv6 address to filter on.";
    }
    leaf version {
      when "../type = 'ip-version'";
      type inet:ip-version;
      description
        "The value of the IP version number to match on.";
    }
    container frame-payload {
      when "../type = 'frame-payload'";
      description
        "Frame payload fragment to match on.";
      leaf offset {
        type uint16;
        description
          "Offset in octets from the start of the frame to begin the
           match on.";
      }
      leaf match {
        type binary;
        description
          "The bytes to match on.";
      }
    }
    leaf frame-length {
      when "../type = 'frame-length'";
      type uint16;
      description
        "Frame length to match on.";
    }
  }

  grouping stream-format {
    description
      "This contains the packet format data that this sampling stream
       is sending.  This is only valid after configuration.  The
       length fields are given in bits, and are consecutive.  Needed
       gaps should use a 'padding' element.";
    list fields {
      key "name";
      description
        "The listing of the fields that will be encapsulated and sent
         to the receiver.";
      leaf name {
        type string {
          length "1..255";
        }
        description
          "Human readable name of what this field contains.";
      }
      leaf size {
        type uint32 {
          range "0..524280";
        }
        description
          "The size of this field, in bits.  The value of '0' denotes
           a variable-sized field.";
      }
      leaf type {
        type field-type;
        description
          "The type of this data.";
      }
      list action-mappings {
        when "../type='action'";
        key "value";
        description
          "The mapping of values to action-type codes, valid for
           type=action.";
        leaf value {
          type binary;
          description
            "The value that will appear in the header.";
        }
        leaf meaning {
          type action-type;
          description
            "What this value indicates.";
        }
      }
      list port-mappings {
        when "../type='ingress-port' | ../type='egress-port'";
        key "value";
        description
          "The mapping of values to interfaces, valid for
           type=ingress-port or type=egress-port";
        leaf value {
          type binary;
          description
            "The value that will appear in the header.";
        }
        leaf port {
          type if:interface-ref;
          description
            "The port the value maps to.";
        }
      }
      list direction-mappings {
        when "../type='direction'";
        key "value";
        description
          "The mapping of values to direction codes, valid for
           type=direction.";
        leaf value {
          type binary;
          description
            "The value that will appear in the header.";
        }
        leaf direction {
          type psamp:direction;
          description
            "The direction the traffic in respect to the port.  The
             value 'both' MUST NOT be used here.";
        }
      }
      container timestamp {
        when "../type='timestamp-nsec' | ../type='timestamp-usec' |
              ../type='timestamp-msec'";
        description
          "Supplemental data for type=timestamp*, in PTP Truncated
           Timestamp Format.  Provides the time used as the epoch for
           the number in the data stream.";
        leaf seconds {
          type uint32;
          description
            "Specifies the integer portion of the number of seconds
             since the epoch.";
        }
        leaf nanoseconds {
          type uint32;
          description
            "Specifies the fractional portion of the number of
             seconds since the epoch, in integer number of
             nanoseconds.";
        }
      }
      leaf payload-contents {
        when "../type='frame-payload-ingress' |
              ../type='frame-payload-egress'";
        type frame-headers;
        description
          "Details about what parts of the frame this payload field
           SHOULD contain.  Note carefully the 'SHOULD' - for a
           variety of reasons (different forwarding paths, exception
           handling, etc.), the actual headers of any one frame MAY
           be different than this.";
      }
    }
  }

  list points {
    key "name";
    description
      "A listing of the observation points available on this device, what
       ports they provide for, and what filtering is available at
       those points.";
    leaf name {
      type psamp:nameType;
      description
        "A unique name for this point.";
    }
    list observationPoints {
      key "name";
      description
        "A list of the observation points (i.e. interfaces) able to be
         monitored at this point.";
      leaf name {
        type psamp:nameType;
        description
          "Name of this observationPoint";
      }
      uses psamp:observationPointParameters;
    }
    list selectors {
      key "name";
      description
        "List of packet selector options available at this point.";
      leaf name {
        type psamp:nameType;
        description
          "A unique name for this selector option.";
      }
      uses psamp:selectorParameters;
    }
    list filters {
      config false;
      description
        "List of filtering options available at this point.";
      leaf filter {
        type filter-type;
        mandatory true;
        description
          "One specific filter available at this point.";
      }
    }
    leaf max-samplers {
      type uint32;
      config false;
      description
        "The maximum number of additional samplers that can be
         installed at this point.";
    }
    leaf max-filters {
      type uint32;
      config false;
      description
        "The maximum number of filtering rules permitted at this
         location.  Note this is an absolute maximum, and fewer rules
         that are complex may still be rejected by the device.";
    }
    leaf max-frame-length-copy {
      type uint16;
      config false;
      description
        "The maximum size that the point can replicate and copy into
         the header.";
    }
    leaf max-frame-depth-inspect {
      type uint16;
      config false;
      description
        "The offset of the last octet in a frame the point can
         perform filtering against.";
    }
    list samplers {
      key "name";
      description
        "A list of all the samplers attached to this point.";
      leaf name {
        type string;
        mandatory true;
        description
          "A unique name given to this sampler.";
      }
      leaf status {
        type status-type;
        mandatory true;
        description
          "The current status of this sampler.";
      }
      leaf client-heartbeat {
        type uint32;
        mandatory true;
        description
          "The number of seconds since the Client has refreshed this
           request.  The Client MUST only be able to set this value
           to 0, the Replicator MUST keep track of it, and SHOULD
           delete this entry when it reaches 3600.";
      }
      container destination {
        description
          "The destination of where to send the UDP stream to.";
        leaf type {
          type destination-type;
          mandatory true;
          description
            "The type of encoding for the destination.";
        }
        container udp-parameters {
          when "../type='udp'";
          description
            "Parameters for destination-type=udp.  Source port is
             always the port number assigned by IANA.";
          leaf destination-ip {
            type inet:ip-address-no-zone;
            mandatory true;
            description
              "The destination IP to send the stream to.";
          }
          leaf destination-port {
            type inet:port-number;
            mandatory true;
            description
              "The destination UDP port number to send the stream
               to.";
          }
        }
      }
      container request {
        description
          "The request as sent in by a Client.";
        container filters {
          description
            "Requested filters to apply to the stream.";
          uses filters;
        }
        container selector {
          description
            "Requested packet Selector.";
          uses psamp:selectorParameters;
        }
        leaf ratio {
          type uint32 {
            range "1..max";
          }
          mandatory true;
          description
            "The requested sampling ratio (1:N, with N being this
             value).";
        }
        leaf min-ratio {
          type uint32 {
            range "1..max";
          }
          description
            "The minimum value of N the client will accept.";
        }
        leaf max-ratio {
          type uint32 {
            range "1..max";
          }
          description
            "The maximum value of N the client will accept.";
        }
      }
      list proposals {
        key "id";
        config false;
        description
          "The proposals as offered by the Replicator.";
        leaf id {
          type uint32 {
            range "1..max";
          }
          description
            "An id-number representing this proposal for selection.";
        }
        container selector {
          description
            "Provided packet Selector, plus stores statistics when
             this proposal is active.";
          uses psamp:selectorParameters;
        }
        leaf performance-penalty {
          type boolean;
          description
            "Selecting this offer will result in a forwarding perfomance
             penalty on the device (usually due to ASIC recirculation)";
        }
        leaf performance-penalty-amount {
          type uint16 {
            range "0..10000";
          }
          description
            "The forwarding performance penalty amount, in hundredths
             of a percent.  This value is not required even if
             performance-penalty is true.  If present, it MUST be
             treated as an estimate.";
        }
        container stream-format {
          description
            "The stream format that would be generated if this
             proposal is selected.";
          uses stream-format;
        }
        list filters {
          key "name";
          description
            "The filters the Replicator can actually apply in this
             proposal.  These MAY not match the request.";
          uses filters;
        }
      }
      leaf proposal-error {
        type string {
          length "1..1023";
        }
        description
          "The Replicator was unable to generate any Proposals.";
      }
      leaf proposal-selected {
        type uint32 {
          range "1..max";
        }
        description
          "The ID of the proposal above the Client wants
           to use.";
      }
      leaf install-error {
        type string {
          length "1..1023";
        }
        description
          "The Replicator was unable to install the requested
           Proposal for this reason.";
      }
    }
  }
}