GRE

GRE

class os_ken.lib.packet.gre.gre(version=0, protocol=2048, checksum=None, key=None, vsid=None, flow_id=None, seq_number=None)

GRE (RFC2784,RFC2890) header encoder/decoder class.

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
version Version.
protocol Protocol Type field. The Protocol Type is defined as "ETHER TYPES".
checksum Checksum field(optional). When you set a value other than None, this field will be automatically calculated.
key Key field(optional) This field is intended to be used for identifying an individual traffic flow within a tunnel.
vsid Virtual Subnet ID field(optional) This field is a 24-bit value that is used to identify the NVGRE-based Virtual Layer 2 Network.
flow_id FlowID field(optional) This field is an 8-bit value that is used to provide per-flow entropy for flows in the same VSID.
seq_number Sequence Number field(optional)
os_ken.lib.packet.gre.nvgre(version=0, vsid=0, flow_id=0)

Generate instance of GRE class with information for NVGRE (RFC7637).

Parameters:
  • version -- Version.
  • vsid -- Virtual Subnet ID.
  • flow_id -- FlowID.
Returns:

Instance of GRE class with information for NVGRE.

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