tcp

type Backlog struct {
	// contains filtered or unexported fields
}

type EndPoint struct {
	Addr mw.V4Addr // ipv4 address
	Port uint16    // port number
}

type Flag uint8

type Hdr struct {
	Src      uint16 // source port
	Dst      uint16 // destination port
	Seq      uint32 // sequence number
	Ack      uint32 // acknowledgement number
	Offset   uint8  // offset (4bits), reserved (3bits), ns (1bit)
	Flag     Flag   // cwr, ece, urg, ack, psh, rst, syn, fin
	Wnd      uint16 // window size
	Checksum uint16
	Urg      uint16 // urgent pointer
}

type PCB struct {
	ID      int
	State   int      // tcp state
	Local   EndPoint // local address/port
	Foreign EndPoint // foreign address/port
	MTU     uint16   // maximum transmission unit
	MSS     uint16   // maximum segment size
	SND     struct {
		UNA uint32 // oldest unacknowledged sequence number
		NXT uint32 // next sequence number to be sent
		WND uint16 // window size
		UP  uint16 // urgent pointer to be sent
		WL1 uint32 // segment sequence number at Last window update
		WL2 uint32 // segment acknowledgment number at Last window update
	}
	RCV struct {
		NXT uint32 // next sequence number to receive
		WND uint16 // window size
		UP  uint16 // urgent pointer to receive
	}
	ISS uint32
	IRS uint32 // initial receive sequence number
	// contains filtered or unexported fields
}

type PseudoHdr struct {
	Src   mw.V4Addr // source address
	Dst   mw.V4Addr // destination address
	Zero  uint8     // zeros
	Proto uint8     // protocol
	Len   uint16    // segment length
}

type SegmentInfo struct {
	Seq  uint32 // sequence number
	Ack  uint32 // acknowledgement number
	Wnd  uint16 // window size
	Flag Flag
}