TCP - Transmission Control Protocol

pcapkit.protocols.transport.tcp contains TCP only, which implements extractor for Transmission Control Protocol (TCP) *, whose structure is described as below:

Octets	Bits	Name	Description
0	0	tcp.srcport	Source Port
2	16	tcp.dstport	Destination Port
4	32	tcp.seq	Sequence Number
8	64	tcp.ack	Acknowledgement Number (if ACK set)
12	96	tcp.hdr_len	Data Offset
12	100		Reserved (must be \x00)
12	103	tcp.flags.ns	ECN Concealment Protection (NS)
13	104	tcp.flags.cwr	Congestion Window Reduced (CWR)
13	105	tcp.flags.ece	ECN-Echo (ECE)
13	106	tcp.flags.urg	Urgent (URG)
13	107	tcp.flags.ack	Acknowledgement (ACK)
13	108	tcp.flags.psh	Push Function (PSH)
13	109	tcp.flags.rst	Reset Connection (RST)
13	110	tcp.flags.syn	Synchronize Sequence Numbers (SYN)
13	111	tcp.flags.fin	Last Packet from Sender (FIN)
14	112	tcp.window_size	Size of Receive Window
16	128	tcp.checksum	Checksum
18	144	tcp.urgent_pointer	Urgent Pointer (if URG set)
20	160	tcp.opt	TCP Options (if data offset > 5)

Data Structures

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*

https://en.wikipedia.org/wiki/Transmission_Control_Protocol