diff options
Diffstat (limited to 'src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/mldv1.go')
-rw-r--r-- | src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/mldv1.go | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/mldv1.go b/src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/mldv1.go new file mode 100644 index 00000000000..e1bb1dc00fe --- /dev/null +++ b/src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/mldv1.go @@ -0,0 +1,182 @@ +// Copyright 2018 GoPacket Authors. 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" + "errors" + "fmt" + "math" + "net" + "time" + + "github.com/google/gopacket" +) + +// MLDv1Message represents the common structure of all MLDv1 messages +type MLDv1Message struct { + BaseLayer + // 3.4. Maximum Response Delay + MaximumResponseDelay time.Duration + // 3.6. Multicast Address + // Zero in general query + // Specific IPv6 multicast address otherwise + MulticastAddress net.IP +} + +// DecodeFromBytes decodes the given bytes into this layer. +func (m *MLDv1Message) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { + if len(data) < 20 { + df.SetTruncated() + return errors.New("ICMP layer less than 20 bytes for Multicast Listener Query Message V1") + } + + m.MaximumResponseDelay = time.Duration(binary.BigEndian.Uint16(data[0:2])) * time.Millisecond + // data[2:4] is reserved and not used in mldv1 + m.MulticastAddress = data[4:20] + + return nil +} + +// NextLayerType returns the layer type contained by this DecodingLayer. +func (*MLDv1Message) NextLayerType() gopacket.LayerType { + return gopacket.LayerTypeZero +} + +// SerializeTo writes the serialized form of this layer into the +// SerializationBuffer, implementing gopacket.SerializableLayer. +// See the docs for gopacket.SerializableLayer for more info. +func (m *MLDv1Message) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { + buf, err := b.PrependBytes(20) + if err != nil { + return err + } + + if m.MaximumResponseDelay < 0 { + return errors.New("maximum response delay must not be negative") + } + dms := m.MaximumResponseDelay / time.Millisecond + if dms > math.MaxUint16 { + return fmt.Errorf("maximum response delay %dms is more than the allowed 65535ms", dms) + } + binary.BigEndian.PutUint16(buf[0:2], uint16(dms)) + + copy(buf[2:4], []byte{0x0, 0x0}) + + ma16 := m.MulticastAddress.To16() + if ma16 == nil { + return fmt.Errorf("invalid multicast address '%s'", m.MulticastAddress) + } + copy(buf[4:20], ma16) + + return nil +} + +// Sums this layer up nicely formatted +func (m *MLDv1Message) String() string { + return fmt.Sprintf( + "Maximum Response Delay: %dms, Multicast Address: %s", + m.MaximumResponseDelay/time.Millisecond, + m.MulticastAddress) +} + +// MLDv1MulticastListenerQueryMessage are sent by the router to determine +// whether there are multicast listeners on the link. +// https://tools.ietf.org/html/rfc2710 Page 5 +type MLDv1MulticastListenerQueryMessage struct { + MLDv1Message +} + +// DecodeFromBytes decodes the given bytes into this layer. +func (m *MLDv1MulticastListenerQueryMessage) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { + err := m.MLDv1Message.DecodeFromBytes(data, df) + if err != nil { + return err + } + + if len(data) > 20 { + m.Payload = data[20:] + } + + return nil +} + +// LayerType returns LayerTypeMLDv1MulticastListenerQuery. +func (*MLDv1MulticastListenerQueryMessage) LayerType() gopacket.LayerType { + return LayerTypeMLDv1MulticastListenerQuery +} + +// CanDecode returns the set of layer types that this DecodingLayer can decode. +func (*MLDv1MulticastListenerQueryMessage) CanDecode() gopacket.LayerClass { + return LayerTypeMLDv1MulticastListenerQuery +} + +// IsGeneralQuery is true when this is a general query. +// In a Query message, the Multicast Address field is set to zero when +// sending a General Query. +// https://tools.ietf.org/html/rfc2710#section-3.6 +func (m *MLDv1MulticastListenerQueryMessage) IsGeneralQuery() bool { + return net.IPv6zero.Equal(m.MulticastAddress) +} + +// IsSpecificQuery is true when this is not a general query. +// In a Query message, the Multicast Address field is set to a specific +// IPv6 multicast address when sending a Multicast-Address-Specific Query. +// https://tools.ietf.org/html/rfc2710#section-3.6 +func (m *MLDv1MulticastListenerQueryMessage) IsSpecificQuery() bool { + return !m.IsGeneralQuery() +} + +// MLDv1MulticastListenerReportMessage is sent by a client listening on +// a specific multicast address to indicate that it is (still) listening +// on the specific multicast address. +// https://tools.ietf.org/html/rfc2710 Page 6 +type MLDv1MulticastListenerReportMessage struct { + MLDv1Message +} + +// LayerType returns LayerTypeMLDv1MulticastListenerReport. +func (*MLDv1MulticastListenerReportMessage) LayerType() gopacket.LayerType { + return LayerTypeMLDv1MulticastListenerReport +} + +// CanDecode returns the set of layer types that this DecodingLayer can decode. +func (*MLDv1MulticastListenerReportMessage) CanDecode() gopacket.LayerClass { + return LayerTypeMLDv1MulticastListenerReport +} + +// MLDv1MulticastListenerDoneMessage should be sent by a client when it ceases +// to listen to a multicast address on an interface. +// https://tools.ietf.org/html/rfc2710 Page 7 +type MLDv1MulticastListenerDoneMessage struct { + MLDv1Message +} + +// LayerType returns LayerTypeMLDv1MulticastListenerDone. +func (*MLDv1MulticastListenerDoneMessage) LayerType() gopacket.LayerType { + return LayerTypeMLDv1MulticastListenerDone +} + +// CanDecode returns the set of layer types that this DecodingLayer can decode. +func (*MLDv1MulticastListenerDoneMessage) CanDecode() gopacket.LayerClass { + return LayerTypeMLDv1MulticastListenerDone +} + +func decodeMLDv1MulticastListenerReport(data []byte, p gopacket.PacketBuilder) error { + m := &MLDv1MulticastListenerReportMessage{} + return decodingLayerDecoder(m, data, p) +} + +func decodeMLDv1MulticastListenerQuery(data []byte, p gopacket.PacketBuilder) error { + m := &MLDv1MulticastListenerQueryMessage{} + return decodingLayerDecoder(m, data, p) +} + +func decodeMLDv1MulticastListenerDone(data []byte, p gopacket.PacketBuilder) error { + m := &MLDv1MulticastListenerDoneMessage{} + return decodingLayerDecoder(m, data, p) +} |