74 lines
2.5 KiB
Go
74 lines
2.5 KiB
Go
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// Copyright 2016 The Netstack Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package udp contains the implementation of the UDP transport protocol. To use
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// it in the networking stack, this package must be added to the project, and
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// activated on the stack by passing udp.ProtocolName (or "udp") as one of the
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// transport protocols when calling stack.New(). Then endpoints can be created
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// by passing udp.ProtocolNumber as the transport protocol number when calling
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// Stack.NewEndpoint().
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package udp
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import (
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"gvisor.googlesource.com/gvisor/pkg/tcpip"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/buffer"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/header"
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"gvisor.googlesource.com/gvisor/pkg/tcpip/stack"
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"gvisor.googlesource.com/gvisor/pkg/waiter"
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)
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const (
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// ProtocolName is the string representation of the udp protocol name.
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ProtocolName = "udp"
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// ProtocolNumber is the udp protocol number.
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ProtocolNumber = header.UDPProtocolNumber
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)
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type protocol struct{}
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// Number returns the udp protocol number.
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func (*protocol) Number() tcpip.TransportProtocolNumber {
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return ProtocolNumber
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}
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// NewEndpoint creates a new udp endpoint.
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func (*protocol) NewEndpoint(stack *stack.Stack, netProto tcpip.NetworkProtocolNumber, waiterQueue *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) {
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return newEndpoint(stack, netProto, waiterQueue), nil
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}
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// MinimumPacketSize returns the minimum valid udp packet size.
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func (*protocol) MinimumPacketSize() int {
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return header.UDPMinimumSize
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}
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// ParsePorts returns the source and destination ports stored in the given udp
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// packet.
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func (*protocol) ParsePorts(v buffer.View) (src, dst uint16, err *tcpip.Error) {
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h := header.UDP(v)
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return h.SourcePort(), h.DestinationPort(), nil
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}
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// HandleUnknownDestinationPacket handles packets targeted at this protocol but
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// that don't match any existing endpoint.
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func (p *protocol) HandleUnknownDestinationPacket(*stack.Route, stack.TransportEndpointID, *buffer.VectorisedView) bool {
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return true
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}
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// SetOption implements TransportProtocol.SetOption.
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func (p *protocol) SetOption(option interface{}) *tcpip.Error {
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return tcpip.ErrUnknownProtocolOption
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}
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// Option implements TransportProtocol.Option.
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func (p *protocol) Option(option interface{}) *tcpip.Error {
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return tcpip.ErrUnknownProtocolOption
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}
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func init() {
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stack.RegisterTransportProtocolFactory(ProtocolName, func() stack.TransportProtocol {
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return &protocol{}
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})
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}
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