# SCTP

class `ryu.lib.packet.sctp.``cause_cookie_while_shutdown`(length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Cookie Received While Shutting Down (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_abort
  - ryu.lib.packet.sctp.chunk_error

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  length | length of this cause containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``cause_invalid_param`(length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Invalid Mandatory Parameter (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_abort
  - ryu.lib.packet.sctp.chunk_error

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  length | length of this cause containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``cause_invalid_stream_id`(value=0, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Invalid Stream Identifier (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_abort
  - ryu.lib.packet.sctp.chunk_error

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | stream id.
  length | length of this cause containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``cause_missing_param`(types=None, num=0, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Missing Mandatory Parameter (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_abort
  - ryu.lib.packet.sctp.chunk_error

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  types | a list of missing params.
  num | Number of missing params. (0 means automatically-calculate when encoding)
  length | length of this cause containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``cause_no_userdata`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for No User Data (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_abort
  - ryu.lib.packet.sctp.chunk_error

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | the TSN of the DATA chunk received with no user data field.
  length | length of this cause containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``cause_out_of_resource`(length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Out of Resource (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_abort
  - ryu.lib.packet.sctp.chunk_error

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  length | length of this cause containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``cause_protocol_violation`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Protocol Violation (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_abort
  - ryu.lib.packet.sctp.chunk_error

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | Additional Information.
  length | length of this cause containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``cause_restart_with_new_addr`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Restart of an Association with New Addresses (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_abort
  - ryu.lib.packet.sctp.chunk_error

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | New Address TLVs.
  length | length of this cause containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``cause_stale_cookie`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Stale Cookie Error (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_abort
  - ryu.lib.packet.sctp.chunk_error

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | Measure of Staleness.
  length | length of this cause containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``cause_unrecognized_chunk`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Unrecognized Chunk Type (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_abort
  - ryu.lib.packet.sctp.chunk_error

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | Unrecognized Chunk.
  length | length of this cause containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``cause_unrecognized_param`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Unrecognized Parameters (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_abort
  - ryu.lib.packet.sctp.chunk_error

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | Unrecognized Parameter.
  length | length of this cause containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``cause_unresolvable_addr`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Unresolvable Address (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_abort
  - ryu.lib.packet.sctp.chunk_error

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | Unresolvable Address. one of follows: ryu.lib.packet.sctp.param_host_addr, ryu.lib.packet.sctp.param_ipv4, or ryu.lib.packet.sctp.param_ipv6.
  length | length of this cause containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``cause_user_initiated_abort`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for User-Initiated Abort (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_abort
  - ryu.lib.packet.sctp.chunk_error

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | Upper Layer Abort Reason.
  length | length of this cause containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``chunk_abort`(tflag=0, length=0, causes=None)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Abort Association (ABORT) chunk (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  tflag | '0' means the Verification tag is normal. '1' means the Verification tag is copy of the sender.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)
  causes | a list of derived classes of ryu.lib.packet.sctp.causes.

class `ryu.lib.packet.sctp.``chunk_cookie_ack`(flags=0, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Cookie Acknowledgement (COOKIE ACK) chunk (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  flags | set to '0'. this field will be ignored.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``chunk_cookie_echo`(flags=0, length=0, cookie=None)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Cookie Echo (COOKIE ECHO) chunk (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  flags | set to '0'. this field will be ignored.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)
  cookie | cookie data.

class `ryu.lib.packet.sctp.``chunk_cwr`(flags=0, length=0, low_tsn=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for CWR chunk (RFC 4960 Appendix A.).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  flags | set to '0'. this field will be ignored.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)
  low_tsn | the lowest TSN.

class `ryu.lib.packet.sctp.``chunk_data`(unordered=0, begin=0, end=0, length=0, tsn=0, sid=0, seq=0, payload_id=0, payload_data=None)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Payload Data (DATA) chunk (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  unordered | if set to '1', the receiver ignores the sequence number.
  begin | if set to '1', this chunk is the first fragment.
  end | if set to '1', this chunk is the last fragment.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)
  tsn | Transmission Sequence Number.
  sid | stream id.
  seq | the sequence number.
  payload_id | application specified protocol id. '0' means that no application id is identified.
  payload_data | user data.

class `ryu.lib.packet.sctp.``chunk_ecn_echo`(flags=0, length=0, low_tsn=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for ECN-Echo chunk (RFC 4960 Appendix A.).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  flags | set to '0'. this field will be ignored.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)
  low_tsn | the lowest TSN.

class `ryu.lib.packet.sctp.``chunk_error`(flags=0, length=0, causes=None)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Operation Error (ERROR) chunk (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  flags | set to '0'. this field will be ignored.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)
  causes | a list of derived classes of ryu.lib.packet.sctp.causes.

class `ryu.lib.packet.sctp.``chunk_heartbeat`(flags=0, length=0, info=None)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Heartbeat Request (HEARTBEAT) chunk (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  flags | set to '0'. this field will be ignored.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)
  info | ryu.lib.packet.sctp.param_heartbeat.

class `ryu.lib.packet.sctp.``chunk_heartbeat_ack`(flags=0, length=0, info=None)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Heartbeat Acknowledgement (HEARTBEAT ACK) chunk (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  flags | set to '0'. this field will be ignored.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)
  info | ryu.lib.packet.sctp.param_heartbeat.

class `ryu.lib.packet.sctp.``chunk_init`(flags=0, length=0, init_tag=0, a_rwnd=0, os=0, mis=0, i_tsn=0, params=None)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Initiation (INIT) chunk (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  flags | set to '0'. this field will be ignored.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)
  init_tag | the tag that be used as Verification Tag.
  a_rwnd | Advertised Receiver Window Credit.
  os | number of outbound streams.
  mis | number of inbound streams.
  i_tsn | Transmission Sequence Number that the sender will use.
  params | Optional/Variable-Length Parameters. a list of derived classes of ryu.lib.packet.sctp.param.

class `ryu.lib.packet.sctp.``chunk_init_ack`(flags=0, length=0, init_tag=0, a_rwnd=0, os=0, mis=0, i_tsn=0, params=None)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Initiation Acknowledgement (INIT ACK) chunk (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  flags | set to '0'. this field will be ignored.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)
  init_tag | the tag that be used as Verification Tag.
  a_rwnd | Advertised Receiver Window Credit.
  os | number of outbound streams.
  mis | number of inbound streams.
  i_tsn | Transmission Sequence Number that the sender will use.
  params | Optional/Variable-Length Parameters. a list of derived classes of ryu.lib.packet.sctp.param.

class `ryu.lib.packet.sctp.``chunk_sack`(flags=0, length=0, tsn_ack=0, a_rwnd=0, gapack_num=0, duptsn_num=0, gapacks=None, duptsns=None)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Selective Acknowledgement (SACK) chunk (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  flags | set to '0'. this field will be ignored.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)
  tsn_ack | TSN of the last DATA chunk received in sequence before a gap.
  a_rwnd | Advertised Receiver Window Credit.
  gapack_num | number of Gap Ack blocks.
  duptsn_num | number of duplicate TSNs.
  gapacks | a list of Gap Ack blocks. one block is made of a list with the start offset and the end offset from tsn_ack. e.g.) gapacks = [[2, 3], [10, 12], [19, 21]]
  duptsns | a list of duplicate TSN.

class `ryu.lib.packet.sctp.``chunk_shutdown`(flags=0, length=0, tsn_ack=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Shutdown Association (SHUTDOWN) chunk (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  flags | set to '0'. this field will be ignored.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)
  tsn_ack | TSN of the last DATA chunk received in sequence before a gap.

class `ryu.lib.packet.sctp.``chunk_shutdown_ack`(flags=0, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Shutdown Acknowledgement (SHUTDOWN ACK) chunk (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  flags | set to '0'. this field will be ignored.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``chunk_shutdown_complete`(tflag=0, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Shutdown Complete (SHUTDOWN COMPLETE) chunk (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.sctp

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  tflag | '0' means the Verification tag is normal. '1' means the Verification tag is copy of the sender.
  length | length of this chunk containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``param_cookie_preserve`(value=0, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Cookie Preservative Parameter (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_init

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | Suggested Cookie Life-Span Increment (msec).
  length | length of this param containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``param_ecn`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for ECN Parameter (RFC 4960 Appendix A.).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_init
  - ryu.lib.packet.sctp.chunk_init_ack

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | set to None.
  length | length of this param containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``param_heartbeat`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Heartbeat Info Parameter (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_heartbeat
  - ryu.lib.packet.sctp.chunk_heartbeat_ack

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | the sender-specific heartbeat information.
  length | length of this param containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``param_host_addr`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Host Name Address Parameter (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_init
  - ryu.lib.packet.sctp.chunk_init_ack

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | a host name that ends with null terminator.
  length | length of this param containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``param_ipv4`(value='127.0.0.1', length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for IPv4 Address Parameter (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_init
  - ryu.lib.packet.sctp.chunk_init_ack

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | IPv4 address of the sending endpoint.
  length | length of this param containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``param_ipv6`(value='::1', length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for IPv6 Address Parameter (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_init
  - ryu.lib.packet.sctp.chunk_init_ack

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | IPv6 address of the sending endpoint.
  length | length of this param containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``param_state_cookie`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for State Cookie Parameter (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_init_ack

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | the state cookie. see Section 5.1.3 in RFC 4960.
  length | length of this param containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``param_supported_addr`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Supported Address Types Parameter (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_init

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | a list of parameter types. odd cases pad with 0x0000.
  length | length of this param containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``param_unrecognized_param`(value=None, length=0)

  Stream Control Transmission Protocol (SCTP) sub encoder/decoder class for Unrecognized Parameter (RFC 4960).

  This class is used with the following.

  - ryu.lib.packet.sctp.chunk_init_ack

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  value | the unrecognized parameter in the INIT chunk.
  length | length of this param containing this header. (0 means automatically-calculate when encoding)

class `ryu.lib.packet.sctp.``sctp`(src_port=1, dst_port=1, vtag=0, csum=0, chunks=None)

  Stream Control Transmission Protocol (SCTP) header encoder/decoder class (RFC 4960).

  An instance has the following attributes at least. Most of them are same to the on-wire counterparts but in host byte order. __init__ takes the corresponding args in this order.

  Attribute | Description
  --- | ---
  src_port | Source Port
  dst_port | Destination Port
  vtag | Verification Tag
  csum | Checksum (0 means automatically-calculate when encoding)
  chunks | a list of derived classes of ryu.lib.packet.sctp.chunk.

  classmethod `parser`(buf)

    Decode a protocol header.

    This method is used only when decoding a packet.

    Decode a protocol header at offset 0 in bytearray buf. Returns the following three objects.

    - An object to describe the decoded header.
    - A packet_base.PacketBase subclass appropriate for the rest of the packet. None when the rest of the packet should be considered as raw payload.
    - The rest of packet.
  `serialize`(payload, prev)

    Encode a protocol header.

    This method is used only when encoding a packet.

    Encode a protocol header. Returns a bytearray which contains the header.

    payload is the rest of the packet which will immediately follow this header.

    prev is a packet_base.PacketBase subclass for the outer protocol header. prev is None if the current header is the outer-most. For example, prev is ipv4 or ipv6 for tcp.serialize.