RFC 9293 - Transmission Control Protocol (TCP)

TCPプロトコルのRFC

RFC 793 - Transmission Control Protocolは昔のやつ

TCPヘッダ

Source Port(送信元ポート番号): 16 bits

Destination Port(宛先ポート番号): 16 bits

Sequence Number(シーケンス番号): 32 bits

Acknowledgment Number(確認応答番号): 32 bits

Data Offset (DOffset、データオフセット): 4 bits

データがどこから始まるか

Reserved (Rsrvd、予約): 4 bits

CWR(Congestion Window Reduced): 1 bit

ECE(ECN-Echo): 1 bit

RFC 3168 - The Addition of Explicit Congestion Notification (ECN) to IP

URG(Urgent pointer): 1 bit

ACK(Acknowledgement): 1 bit

PSH(Push): 1 bit

RST(Reset): 1 bit

SYN(Synchronize): 1 bit

FIN(Finish): 1 bit

Window(ウィンドウ): 16 bits

Urgent Pointer(緊急ポインタ): 16 bits

Obsoletes

RFC 793

RFC 1011 OFFICIAL INTERNET PROTOCOLS

RFC 1122 - Requirements for Internet Hosts -- Communication Layers

RFC 5861: HTTP Cache-Control Extensions for Stale Content

code:mermaid

stateDiagram-v2

CLOSED --> LISTEN: passive OPEN ------ create TCB

LISTEN --> CLOSED: CLOSE ------ delete TCB

CLOSED --> SYN_SENT: active OPEN ------ create TCB snd SYN

SYN_SENT --> CLOSED: CLOSE ------ delete TCB

LISTEN --> SYN_SENT: SEND ------ snd SYN

LISTEN --> SYN_RCVD: rcv SYN ------ snd SYN, ACK

SYN_RCVD --> LISTEN: rcv RST (note 1)

SYN_SENT --> SYN_RCVD: rcv SYN ------ snd SYN, ACK

SYN_RCVD --> FINWAIT_1: CLOSE ------ snd FIN

SYN_RCVD --> ESTAB: rcv ACK of SYN ------ x

SYN_SENT --> ESTAB: rcv ACK, SYN ------ snd ACK

ESTAB --> FINWAIT_1: CLOSE ------ snd FIN

ESTAB --> CLOSE_WAIT: rcv FIN ------ snd ACK

FINWAIT_1 --> FINWAIT_2: rcv ACK of FIN ------ x

FINWAIT_1 --> CLOSING: rcv FIN ------ snd ACK

FINWAIT_2 --> TIME_WAIT: rcv FIN ------ snd ACK

CLOSING --> TIME_WAIT: rcv ACK of FIN ------ x

CLOSE_WAIT --> LAST_ACK: CLOSE ------ snd FIN

LAST_ACK --> CLOSED: rcv ACK of FIN ------ x

TIME_WAIT --> CLOSED: Timeout=2MSL ------ delete TCB

確認用

Q. RFC 9293

#RFC