---
protocol: &tcp
  name: TCP
  fields:
    - field: srcport
      desc: source port
      length: 2
    - field: dstport
      desc: destination port
      length: 2
    - field: seqno
      desc: sequence number
      length: 4
    - field: ackno
      desc: acknowledgment number
      length: 4
    - field: dataoffset
      desc: data offset
      bitfield: yes
      length: 4
    - field: reserved
      bitfield: yes
      length: 6
    - field: URG
      bitfield: yes
      length: 1
    - field: ACK
      bitfield: yes
      length: 1
    - field: PSH
      bitfield: yes
      length: 1
    - field: RST
      bitfield: yes
      length: 1
    - field: SYN
      bitfield: yes
      length: 1
    - field: FIN
      bitfield: yes
      length: 1
    - field: window
      length: 2
    - field: checksum
      length: 2
    - field: options
      length: 4
      optional: true
      repeatable: true
    - field: data
      data: true
  osilayer: 4