You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: protocol.go
    path of file: ./repos/sliver/implant/vendor/gvisor.dev/gvisor/pkg/tcpip/transport/tcp
    
    the code of the file until where you have to start completion: // Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applica
    
func replyWithReset(st *stack.Stack, s *segment, tos, ipv4TTL uint8, ipv6HopLimit int16) tcpip.Error {
	net := s.pkt.Network()
	route, err := st.FindRoute(s.pkt.NICID, net.DestinationAddress(), net.SourceAddress(), s.pkt.NetworkProtocolNumber, false /* multicastLoop */)
	if err != nil {
		return err
	}
	defer route.Release()

	ttl := calculateTTL(route, ipv4TTL, ipv6HopLimit)

	// Get the seqnum from the packet if the ack flag is set.
	seq := seqnum.Value(0)
	ack := seqnum.Value(0)
	flags := header.TCPFlagRst
	// As per RFC 793 page 35 (Reset Generation)
	//   1.  If the connection does not exist (CLOSED) then a reset is sent
	//   in response to any incoming segment except another reset.  In
	//   particular, SYNs addressed to a non-existent connection are rejected
	//   by this means.

	//   If the incoming segment has an ACK field, the reset takes its
	//   sequence number from the ACK field of the segment, otherwise the
	//   reset has sequence number zero and the ACK field is set to the sum
	//   of the sequence number and segment length of the incoming segment.
	//   The connection remains in the CLOSED state.
	if s.flags.Contains(header.TCPFlagAck) {
		seq = s.ackNumber
	} else {
		flags |= header.TCPFlagAck
		ack = s.sequenceNumber.Add(s.logicalLen())
	}

	p := stack.NewPacketBuffer(stack.PacketBufferOptions{ReserveHeaderBytes: header.TCPMinimumSize + int(route.MaxHeaderLength())})
	defer p.DecRef()
	return sendTCP(route, tcpFields{
		id:     s.id,
		ttl:    ttl,
		tos:    tos,
		flags:  flags,
		seq:    seq,
		ack:    ack,
		rcvWnd: 0,
	}, p, stack.GSO{}, nil /* PacketOwner */)
}