122 lines
3.5 KiB
Go
122 lines
3.5 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package header
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import (
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"encoding/binary"
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"gvisor.dev/gvisor/pkg/tcpip"
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)
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// ICMPv6 represents an ICMPv6 header stored in a byte array.
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type ICMPv6 []byte
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const (
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// ICMPv6MinimumSize is the minimum size of a valid ICMP packet.
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ICMPv6MinimumSize = 4
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// ICMPv6ProtocolNumber is the ICMP transport protocol number.
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ICMPv6ProtocolNumber tcpip.TransportProtocolNumber = 58
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// ICMPv6NeighborSolicitMinimumSize is the minimum size of a
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// neighbor solicitation packet.
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ICMPv6NeighborSolicitMinimumSize = ICMPv6MinimumSize + 4 + 16
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// ICMPv6NeighborAdvertSize is size of a neighbor advertisement.
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ICMPv6NeighborAdvertSize = 32
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// ICMPv6EchoMinimumSize is the minimum size of a valid ICMP echo packet.
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ICMPv6EchoMinimumSize = 8
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// ICMPv6DstUnreachableMinimumSize is the minimum size of a valid ICMP
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// destination unreachable packet.
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ICMPv6DstUnreachableMinimumSize = ICMPv6MinimumSize + 4
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// ICMPv6PacketTooBigMinimumSize is the minimum size of a valid ICMP
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// packet-too-big packet.
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ICMPv6PacketTooBigMinimumSize = ICMPv6MinimumSize + 4
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)
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// ICMPv6Type is the ICMP type field described in RFC 4443 and friends.
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type ICMPv6Type byte
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// Typical values of ICMPv6Type defined in RFC 4443.
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const (
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ICMPv6DstUnreachable ICMPv6Type = 1
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ICMPv6PacketTooBig ICMPv6Type = 2
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ICMPv6TimeExceeded ICMPv6Type = 3
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ICMPv6ParamProblem ICMPv6Type = 4
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ICMPv6EchoRequest ICMPv6Type = 128
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ICMPv6EchoReply ICMPv6Type = 129
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// Neighbor Discovery Protocol (NDP) messages, see RFC 4861.
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ICMPv6RouterSolicit ICMPv6Type = 133
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ICMPv6RouterAdvert ICMPv6Type = 134
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ICMPv6NeighborSolicit ICMPv6Type = 135
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ICMPv6NeighborAdvert ICMPv6Type = 136
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ICMPv6RedirectMsg ICMPv6Type = 137
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)
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// Values for ICMP code as defined in RFC 4443.
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const (
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ICMPv6PortUnreachable = 4
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)
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// Type is the ICMP type field.
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func (b ICMPv6) Type() ICMPv6Type { return ICMPv6Type(b[0]) }
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// SetType sets the ICMP type field.
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func (b ICMPv6) SetType(t ICMPv6Type) { b[0] = byte(t) }
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// Code is the ICMP code field. Its meaning depends on the value of Type.
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func (b ICMPv6) Code() byte { return b[1] }
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// SetCode sets the ICMP code field.
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func (b ICMPv6) SetCode(c byte) { b[1] = c }
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// Checksum is the ICMP checksum field.
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func (b ICMPv6) Checksum() uint16 {
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return binary.BigEndian.Uint16(b[2:])
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}
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// SetChecksum calculates and sets the ICMP checksum field.
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func (b ICMPv6) SetChecksum(checksum uint16) {
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binary.BigEndian.PutUint16(b[2:], checksum)
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}
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// SourcePort implements Transport.SourcePort.
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func (ICMPv6) SourcePort() uint16 {
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return 0
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}
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// DestinationPort implements Transport.DestinationPort.
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func (ICMPv6) DestinationPort() uint16 {
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return 0
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}
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// SetSourcePort implements Transport.SetSourcePort.
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func (ICMPv6) SetSourcePort(uint16) {
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}
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// SetDestinationPort implements Transport.SetDestinationPort.
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func (ICMPv6) SetDestinationPort(uint16) {
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}
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// Payload implements Transport.Payload.
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func (b ICMPv6) Payload() []byte {
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return b[ICMPv6MinimumSize:]
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}
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