diff options
Diffstat (limited to 'src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/icmp6msg.go')
| -rw-r--r-- | src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/icmp6msg.go | 578 |
1 files changed, 578 insertions, 0 deletions
diff --git a/src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/icmp6msg.go b/src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/icmp6msg.go new file mode 100644 index 00000000000..d9268db0563 --- /dev/null +++ b/src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/icmp6msg.go @@ -0,0 +1,578 @@ +// Copyright 2012 Google, Inc. All rights reserved. +// Copyright 2009-2011 Andreas Krennmair. All rights reserved. +// +// Use of this source code is governed by a BSD-style license +// that can be found in the LICENSE file in the root of the source +// tree. + +package layers + +import ( + "encoding/binary" + "encoding/hex" + "errors" + "fmt" + "net" + "time" + + "github.com/google/gopacket" +) + +// Based on RFC 4861 + +// ICMPv6Opt indicate how to decode the data associated with each ICMPv6Option. +type ICMPv6Opt uint8 + +const ( + _ ICMPv6Opt = iota + + // ICMPv6OptSourceAddress contains the link-layer address of the sender of + // the packet. It is used in the Neighbor Solicitation, Router + // Solicitation, and Router Advertisement packets. Must be ignored for other + // Neighbor discovery messages. + ICMPv6OptSourceAddress + + // ICMPv6OptTargetAddress contains the link-layer address of the target. It + // is used in Neighbor Advertisement and Redirect packets. Must be ignored + // for other Neighbor discovery messages. + ICMPv6OptTargetAddress + + // ICMPv6OptPrefixInfo provides hosts with on-link prefixes and prefixes + // for Address Autoconfiguration. The Prefix Information option appears in + // Router Advertisement packets and MUST be silently ignored for other + // messages. + ICMPv6OptPrefixInfo + + // ICMPv6OptRedirectedHeader is used in Redirect messages and contains all + // or part of the packet that is being redirected. + ICMPv6OptRedirectedHeader + + // ICMPv6OptMTU is used in Router Advertisement messages to ensure that all + // nodes on a link use the same MTU value in those cases where the link MTU + // is not well known. This option MUST be silently ignored for other + // Neighbor Discovery messages. + ICMPv6OptMTU +) + +// ICMPv6Echo represents the structure of a ping. +type ICMPv6Echo struct { + BaseLayer + Identifier uint16 + SeqNumber uint16 +} + +// ICMPv6RouterSolicitation is sent by hosts to find routers. +type ICMPv6RouterSolicitation struct { + BaseLayer + Options ICMPv6Options +} + +// ICMPv6RouterAdvertisement is sent by routers in response to Solicitation. +type ICMPv6RouterAdvertisement struct { + BaseLayer + HopLimit uint8 + Flags uint8 + RouterLifetime uint16 + ReachableTime uint32 + RetransTimer uint32 + Options ICMPv6Options +} + +// ICMPv6NeighborSolicitation is sent to request the link-layer address of a +// target node. +type ICMPv6NeighborSolicitation struct { + BaseLayer + TargetAddress net.IP + Options ICMPv6Options +} + +// ICMPv6NeighborAdvertisement is sent by nodes in response to Solicitation. +type ICMPv6NeighborAdvertisement struct { + BaseLayer + Flags uint8 + TargetAddress net.IP + Options ICMPv6Options +} + +// ICMPv6Redirect is sent by routers to inform hosts of a better first-hop node +// on the path to a destination. +type ICMPv6Redirect struct { + BaseLayer + TargetAddress net.IP + DestinationAddress net.IP + Options ICMPv6Options +} + +// ICMPv6Option contains the type and data for a single option. +type ICMPv6Option struct { + Type ICMPv6Opt + Data []byte +} + +// ICMPv6Options is a slice of ICMPv6Option. +type ICMPv6Options []ICMPv6Option + +func (i ICMPv6Opt) String() string { + switch i { + case ICMPv6OptSourceAddress: + return "SourceAddress" + case ICMPv6OptTargetAddress: + return "TargetAddress" + case ICMPv6OptPrefixInfo: + return "PrefixInfo" + case ICMPv6OptRedirectedHeader: + return "RedirectedHeader" + case ICMPv6OptMTU: + return "MTU" + default: + return fmt.Sprintf("Unknown(%d)", i) + } +} + +// CanDecode returns the set of layer types that this DecodingLayer can decode. +func (i *ICMPv6Echo) CanDecode() gopacket.LayerClass { + return LayerTypeICMPv6Echo +} + +// LayerType returns LayerTypeICMPv6Echo. +func (i *ICMPv6Echo) LayerType() gopacket.LayerType { + return LayerTypeICMPv6Echo +} + +// NextLayerType returns the layer type contained by this DecodingLayer. +func (i *ICMPv6Echo) NextLayerType() gopacket.LayerType { + return gopacket.LayerTypePayload +} + +// DecodeFromBytes decodes the given bytes into this layer. +func (i *ICMPv6Echo) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { + if len(data) < 4 { + df.SetTruncated() + return errors.New("ICMP layer less then 4 bytes for ICMPv6 Echo") + } + i.Identifier = binary.BigEndian.Uint16(data[0:2]) + i.SeqNumber = binary.BigEndian.Uint16(data[2:4]) + + return nil +} + +// SerializeTo writes the serialized form of this layer into the +// SerializationBuffer, implementing gopacket.SerializableLayer. +// See the docs for gopacket.SerializableLayer for more info. +func (i *ICMPv6Echo) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { + buf, err := b.PrependBytes(4) + if err != nil { + return err + } + + binary.BigEndian.PutUint16(buf, i.Identifier) + binary.BigEndian.PutUint16(buf[2:], i.SeqNumber) + return nil +} + +// LayerType returns LayerTypeICMPv6. +func (i *ICMPv6RouterSolicitation) LayerType() gopacket.LayerType { + return LayerTypeICMPv6RouterSolicitation +} + +// NextLayerType returns the layer type contained by this DecodingLayer. +func (i *ICMPv6RouterSolicitation) NextLayerType() gopacket.LayerType { + return gopacket.LayerTypePayload +} + +// DecodeFromBytes decodes the given bytes into this layer. +func (i *ICMPv6RouterSolicitation) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { + // first 4 bytes are reserved followed by options + if len(data) < 4 { + df.SetTruncated() + return errors.New("ICMP layer less then 4 bytes for ICMPv6 router solicitation") + } + + // truncate old options + i.Options = i.Options[:0] + + return i.Options.DecodeFromBytes(data[4:], df) +} + +// SerializeTo writes the serialized form of this layer into the +// SerializationBuffer, implementing gopacket.SerializableLayer. +// See the docs for gopacket.SerializableLayer for more info. +func (i *ICMPv6RouterSolicitation) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { + if err := i.Options.SerializeTo(b, opts); err != nil { + return err + } + + buf, err := b.PrependBytes(4) + if err != nil { + return err + } + + copy(buf, lotsOfZeros[:4]) + return nil +} + +// CanDecode returns the set of layer types that this DecodingLayer can decode. +func (i *ICMPv6RouterSolicitation) CanDecode() gopacket.LayerClass { + return LayerTypeICMPv6RouterSolicitation +} + +// LayerType returns LayerTypeICMPv6RouterAdvertisement. +func (i *ICMPv6RouterAdvertisement) LayerType() gopacket.LayerType { + return LayerTypeICMPv6RouterAdvertisement +} + +// NextLayerType returns the layer type contained by this DecodingLayer. +func (i *ICMPv6RouterAdvertisement) NextLayerType() gopacket.LayerType { + return gopacket.LayerTypePayload +} + +// DecodeFromBytes decodes the given bytes into this layer. +func (i *ICMPv6RouterAdvertisement) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { + if len(data) < 12 { + df.SetTruncated() + return errors.New("ICMP layer less then 12 bytes for ICMPv6 router advertisement") + } + + i.HopLimit = uint8(data[0]) + // M, O bit followed by 6 reserved bits + i.Flags = uint8(data[1]) + i.RouterLifetime = binary.BigEndian.Uint16(data[2:4]) + i.ReachableTime = binary.BigEndian.Uint32(data[4:8]) + i.RetransTimer = binary.BigEndian.Uint32(data[8:12]) + i.BaseLayer = BaseLayer{data, nil} // assume no payload + + // truncate old options + i.Options = i.Options[:0] + + return i.Options.DecodeFromBytes(data[12:], df) +} + +// SerializeTo writes the serialized form of this layer into the +// SerializationBuffer, implementing gopacket.SerializableLayer. +// See the docs for gopacket.SerializableLayer for more info. +func (i *ICMPv6RouterAdvertisement) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { + if err := i.Options.SerializeTo(b, opts); err != nil { + return err + } + + buf, err := b.PrependBytes(12) + if err != nil { + return err + } + + buf[0] = byte(i.HopLimit) + buf[1] = byte(i.Flags) + binary.BigEndian.PutUint16(buf[2:], i.RouterLifetime) + binary.BigEndian.PutUint32(buf[4:], i.ReachableTime) + binary.BigEndian.PutUint32(buf[8:], i.RetransTimer) + return nil +} + +// CanDecode returns the set of layer types that this DecodingLayer can decode. +func (i *ICMPv6RouterAdvertisement) CanDecode() gopacket.LayerClass { + return LayerTypeICMPv6RouterAdvertisement +} + +// ManagedAddressConfig is true when addresses are available via DHCPv6. If +// set, the OtherConfig flag is redundant. +func (i *ICMPv6RouterAdvertisement) ManagedAddressConfig() bool { + return i.Flags&0x80 != 0 +} + +// OtherConfig is true when there is other configuration information available +// via DHCPv6. For example, DNS-related information. +func (i *ICMPv6RouterAdvertisement) OtherConfig() bool { + return i.Flags&0x40 != 0 +} + +// LayerType returns LayerTypeICMPv6NeighborSolicitation. +func (i *ICMPv6NeighborSolicitation) LayerType() gopacket.LayerType { + return LayerTypeICMPv6NeighborSolicitation +} + +// NextLayerType returns the layer type contained by this DecodingLayer. +func (i *ICMPv6NeighborSolicitation) NextLayerType() gopacket.LayerType { + return gopacket.LayerTypePayload +} + +// DecodeFromBytes decodes the given bytes into this layer. +func (i *ICMPv6NeighborSolicitation) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { + if len(data) < 20 { + df.SetTruncated() + return errors.New("ICMP layer less then 20 bytes for ICMPv6 neighbor solicitation") + } + + i.TargetAddress = net.IP(data[4:20]) + i.BaseLayer = BaseLayer{data, nil} // assume no payload + + // truncate old options + i.Options = i.Options[:0] + + return i.Options.DecodeFromBytes(data[20:], df) +} + +// SerializeTo writes the serialized form of this layer into the +// SerializationBuffer, implementing gopacket.SerializableLayer. +// See the docs for gopacket.SerializableLayer for more info. +func (i *ICMPv6NeighborSolicitation) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { + if err := i.Options.SerializeTo(b, opts); err != nil { + return err + } + + buf, err := b.PrependBytes(20) + if err != nil { + return err + } + + copy(buf, lotsOfZeros[:4]) + copy(buf[4:], i.TargetAddress) + return nil +} + +// CanDecode returns the set of layer types that this DecodingLayer can decode. +func (i *ICMPv6NeighborSolicitation) CanDecode() gopacket.LayerClass { + return LayerTypeICMPv6NeighborSolicitation +} + +// LayerType returns LayerTypeICMPv6NeighborAdvertisement. +func (i *ICMPv6NeighborAdvertisement) LayerType() gopacket.LayerType { + return LayerTypeICMPv6NeighborAdvertisement +} + +// NextLayerType returns the layer type contained by this DecodingLayer. +func (i *ICMPv6NeighborAdvertisement) NextLayerType() gopacket.LayerType { + return gopacket.LayerTypePayload +} + +// DecodeFromBytes decodes the given bytes into this layer. +func (i *ICMPv6NeighborAdvertisement) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { + if len(data) < 20 { + df.SetTruncated() + return errors.New("ICMP layer less then 20 bytes for ICMPv6 neighbor advertisement") + } + + i.Flags = uint8(data[0]) + i.TargetAddress = net.IP(data[4:20]) + i.BaseLayer = BaseLayer{data, nil} // assume no payload + + // truncate old options + i.Options = i.Options[:0] + + return i.Options.DecodeFromBytes(data[20:], df) +} + +// SerializeTo writes the serialized form of this layer into the +// SerializationBuffer, implementing gopacket.SerializableLayer. +// See the docs for gopacket.SerializableLayer for more info. +func (i *ICMPv6NeighborAdvertisement) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { + if err := i.Options.SerializeTo(b, opts); err != nil { + return err + } + + buf, err := b.PrependBytes(20) + if err != nil { + return err + } + + buf[0] = byte(i.Flags) + copy(buf[1:], lotsOfZeros[:3]) + copy(buf[4:], i.TargetAddress) + return nil +} + +// CanDecode returns the set of layer types that this DecodingLayer can decode. +func (i *ICMPv6NeighborAdvertisement) CanDecode() gopacket.LayerClass { + return LayerTypeICMPv6NeighborAdvertisement +} + +// Router indicates whether the sender is a router or not. +func (i *ICMPv6NeighborAdvertisement) Router() bool { + return i.Flags&0x80 != 0 +} + +// Solicited indicates whether the advertisement was solicited or not. +func (i *ICMPv6NeighborAdvertisement) Solicited() bool { + return i.Flags&0x40 != 0 +} + +// Override indicates whether the advertisement should Override an existing +// cache entry. +func (i *ICMPv6NeighborAdvertisement) Override() bool { + return i.Flags&0x20 != 0 +} + +// LayerType returns LayerTypeICMPv6Redirect. +func (i *ICMPv6Redirect) LayerType() gopacket.LayerType { + return LayerTypeICMPv6Redirect +} + +// NextLayerType returns the layer type contained by this DecodingLayer. +func (i *ICMPv6Redirect) NextLayerType() gopacket.LayerType { + return gopacket.LayerTypePayload +} + +// DecodeFromBytes decodes the given bytes into this layer. +func (i *ICMPv6Redirect) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { + if len(data) < 36 { + df.SetTruncated() + return errors.New("ICMP layer less then 36 bytes for ICMPv6 redirect") + } + + i.TargetAddress = net.IP(data[4:20]) + i.DestinationAddress = net.IP(data[20:36]) + i.BaseLayer = BaseLayer{data, nil} // assume no payload + + // truncate old options + i.Options = i.Options[:0] + + return i.Options.DecodeFromBytes(data[36:], df) +} + +// SerializeTo writes the serialized form of this layer into the +// SerializationBuffer, implementing gopacket.SerializableLayer. +// See the docs for gopacket.SerializableLayer for more info. +func (i *ICMPv6Redirect) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { + if err := i.Options.SerializeTo(b, opts); err != nil { + return err + } + + buf, err := b.PrependBytes(36) + if err != nil { + return err + } + + copy(buf, lotsOfZeros[:4]) + copy(buf[4:], i.TargetAddress) + copy(buf[20:], i.DestinationAddress) + return nil +} + +// CanDecode returns the set of layer types that this DecodingLayer can decode. +func (i *ICMPv6Redirect) CanDecode() gopacket.LayerClass { + return LayerTypeICMPv6Redirect +} + +func (i ICMPv6Option) String() string { + hd := hex.EncodeToString(i.Data) + if len(hd) > 0 { + hd = " 0x" + hd + } + + switch i.Type { + case ICMPv6OptSourceAddress, ICMPv6OptTargetAddress: + return fmt.Sprintf("ICMPv6Option(%s:%v)", + i.Type, + net.HardwareAddr(i.Data)) + case ICMPv6OptPrefixInfo: + if len(i.Data) == 30 { + prefixLen := uint8(i.Data[0]) + onLink := (i.Data[1]&0x80 != 0) + autonomous := (i.Data[1]&0x40 != 0) + validLifetime := time.Duration(binary.BigEndian.Uint32(i.Data[2:6])) * time.Second + preferredLifetime := time.Duration(binary.BigEndian.Uint32(i.Data[6:10])) * time.Second + + prefix := net.IP(i.Data[14:]) + + return fmt.Sprintf("ICMPv6Option(%s:%v/%v:%t:%t:%v:%v)", + i.Type, + prefix, prefixLen, + onLink, autonomous, + validLifetime, preferredLifetime) + } + case ICMPv6OptRedirectedHeader: + // could invoke IP decoder on data... probably best not to + break + case ICMPv6OptMTU: + if len(i.Data) == 6 { + return fmt.Sprintf("ICMPv6Option(%s:%v)", + i.Type, + binary.BigEndian.Uint32(i.Data[2:])) + } + + } + return fmt.Sprintf("ICMPv6Option(%s:%s)", i.Type, hd) +} + +// DecodeFromBytes decodes the given bytes into this layer. +func (i *ICMPv6Options) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { + for len(data) > 0 { + if len(data) < 2 { + df.SetTruncated() + return errors.New("ICMP layer less then 2 bytes for ICMPv6 message option") + } + + // unit is 8 octets, convert to bytes + length := int(data[1]) * 8 + + if length == 0 { + df.SetTruncated() + return errors.New("ICMPv6 message option with length 0") + } + + if len(data) < length { + df.SetTruncated() + return fmt.Errorf("ICMP layer only %v bytes for ICMPv6 message option with length %v", len(data), length) + } + + o := ICMPv6Option{ + Type: ICMPv6Opt(data[0]), + Data: data[2:length], + } + + // chop off option we just consumed + data = data[length:] + + *i = append(*i, o) + } + + return nil +} + +// SerializeTo writes the serialized form of this layer into the +// SerializationBuffer, implementing gopacket.SerializableLayer. +// See the docs for gopacket.SerializableLayer for more info. +func (i *ICMPv6Options) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { + for _, opt := range []ICMPv6Option(*i) { + length := len(opt.Data) + 2 + buf, err := b.PrependBytes(length) + if err != nil { + return err + } + + buf[0] = byte(opt.Type) + buf[1] = byte(length / 8) + copy(buf[2:], opt.Data) + } + + return nil +} + +func decodeICMPv6Echo(data []byte, p gopacket.PacketBuilder) error { + i := &ICMPv6Echo{} + return decodingLayerDecoder(i, data, p) +} + +func decodeICMPv6RouterSolicitation(data []byte, p gopacket.PacketBuilder) error { + i := &ICMPv6RouterSolicitation{} + return decodingLayerDecoder(i, data, p) +} + +func decodeICMPv6RouterAdvertisement(data []byte, p gopacket.PacketBuilder) error { + i := &ICMPv6RouterAdvertisement{} + return decodingLayerDecoder(i, data, p) +} + +func decodeICMPv6NeighborSolicitation(data []byte, p gopacket.PacketBuilder) error { + i := &ICMPv6NeighborSolicitation{} + return decodingLayerDecoder(i, data, p) +} + +func decodeICMPv6NeighborAdvertisement(data []byte, p gopacket.PacketBuilder) error { + i := &ICMPv6NeighborAdvertisement{} + return decodingLayerDecoder(i, data, p) +} + +func decodeICMPv6Redirect(data []byte, p gopacket.PacketBuilder) error { + i := &ICMPv6Redirect{} + return decodingLayerDecoder(i, data, p) +} |