UDP¶
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class
ryu.lib.packet.udp.udp(src_port=1, dst_port=1, total_length=0, csum=0)¶ UDP (RFC 768) 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 src_port Source Port dst_port Destination Port total_length Length (0 means automatically-calculate when encoding) csum Checksum (0 means automatically-calculate when encoding) -
static
get_packet_type(src_port, dst_port)¶ Per-protocol dict-like get method.
Provided for convenience of protocol implementers. Internal use only.
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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.
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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.
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static