ethernet(dst='ff:ff:ff:ff:ff:ff', src='00:00:00:00:00:00', ethertype=2048)¶
Ethernet header encoder/decoder class.
An instance has the following attributes at least. MAC addresses are represented as a string like '08:60:6e:7f:74:e7'. __init__ takes the corresponding args in this order.
Attribute Description Example dst destination address 'ff:ff:ff:ff:ff:ff' src source address '08:60:6e:7f:74:e7' ethertype ether type 0x0800
Override method for the ethernet IEEE802.3 Length/Type field (self.ethertype).
If the value of Length/Type field is less than or equal to 1500 decimal(05DC hexadecimal), it means Length interpretation and be passed to the LLC sublayer.
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.
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.