diff options
Diffstat (limited to 'src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/llc.go')
| -rw-r--r-- | src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/llc.go | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/llc.go b/src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/llc.go deleted file mode 100644 index 2f2e4a52d01..00000000000 --- a/src/mongo/gotools/src/github.com/mongodb/mongo-tools/vendor/github.com/google/gopacket/layers/llc.go +++ /dev/null @@ -1,193 +0,0 @@ -// Copyright 2012 Google, Inc. 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" - - "github.com/google/gopacket" -) - -// LLC is the layer used for 802.2 Logical Link Control headers. -// See http://standards.ieee.org/getieee802/download/802.2-1998.pdf -type LLC struct { - BaseLayer - DSAP uint8 - IG bool // true means group, false means individual - SSAP uint8 - CR bool // true means response, false means command - Control uint16 -} - -// LayerType returns gopacket.LayerTypeLLC. -func (l *LLC) LayerType() gopacket.LayerType { return LayerTypeLLC } - -// DecodeFromBytes decodes the given bytes into this layer. -func (l *LLC) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { - if len(data) < 3 { - return errors.New("LLC header too small") - } - l.DSAP = data[0] & 0xFE - l.IG = data[0]&0x1 != 0 - l.SSAP = data[1] & 0xFE - l.CR = data[1]&0x1 != 0 - l.Control = uint16(data[2]) - - if l.Control&0x1 == 0 || l.Control&0x3 == 0x1 { - if len(data) < 4 { - return errors.New("LLC header too small") - } - l.Control = l.Control<<8 | uint16(data[3]) - l.Contents = data[:4] - l.Payload = data[4:] - } else { - l.Contents = data[:3] - l.Payload = data[3:] - } - return nil -} - -// CanDecode returns the set of layer types that this DecodingLayer can decode. -func (l *LLC) CanDecode() gopacket.LayerClass { - return LayerTypeLLC -} - -// NextLayerType returns the layer type contained by this DecodingLayer. -func (l *LLC) NextLayerType() gopacket.LayerType { - switch { - case l.DSAP == 0xAA && l.SSAP == 0xAA: - return LayerTypeSNAP - case l.DSAP == 0x42 && l.SSAP == 0x42: - return LayerTypeSTP - } - return gopacket.LayerTypeZero // Not implemented -} - -// SNAP is used inside LLC. See -// http://standards.ieee.org/getieee802/download/802-2001.pdf. -// From http://en.wikipedia.org/wiki/Subnetwork_Access_Protocol: -// "[T]he Subnetwork Access Protocol (SNAP) is a mechanism for multiplexing, -// on networks using IEEE 802.2 LLC, more protocols than can be distinguished -// by the 8-bit 802.2 Service Access Point (SAP) fields." -type SNAP struct { - BaseLayer - OrganizationalCode []byte - Type EthernetType -} - -// LayerType returns gopacket.LayerTypeSNAP. -func (s *SNAP) LayerType() gopacket.LayerType { return LayerTypeSNAP } - -// DecodeFromBytes decodes the given bytes into this layer. -func (s *SNAP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { - if len(data) < 5 { - return errors.New("SNAP header too small") - } - s.OrganizationalCode = data[:3] - s.Type = EthernetType(binary.BigEndian.Uint16(data[3:5])) - s.BaseLayer = BaseLayer{data[:5], data[5:]} - return nil -} - -// CanDecode returns the set of layer types that this DecodingLayer can decode. -func (s *SNAP) CanDecode() gopacket.LayerClass { - return LayerTypeLLC -} - -// NextLayerType returns the layer type contained by this DecodingLayer. -func (s *SNAP) NextLayerType() gopacket.LayerType { - // See BUG(gconnel) in decodeSNAP - return s.Type.LayerType() -} - -func decodeLLC(data []byte, p gopacket.PacketBuilder) error { - l := &LLC{} - err := l.DecodeFromBytes(data, p) - if err != nil { - return err - } - p.AddLayer(l) - return p.NextDecoder(l.NextLayerType()) -} - -func decodeSNAP(data []byte, p gopacket.PacketBuilder) error { - s := &SNAP{} - err := s.DecodeFromBytes(data, p) - if err != nil { - return err - } - p.AddLayer(s) - // BUG(gconnell): When decoding SNAP, we treat the SNAP type as an Ethernet - // type. This may not actually be an ethernet type in all cases, - // depending on the organizational code. Right now, we don't check. - return p.NextDecoder(s.Type) -} - -// SerializeTo writes the serialized form of this layer into the -// SerializationBuffer, implementing gopacket.SerializableLayer. -// See the docs for gopacket.SerializableLayer for more info. -func (l *LLC) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { - var igFlag, crFlag byte - var length int - - if l.Control&0xFF00 != 0 { - length = 4 - } else { - length = 3 - } - - if l.DSAP&0x1 != 0 { - return errors.New("DSAP value invalid, should not include IG flag bit") - } - - if l.SSAP&0x1 != 0 { - return errors.New("SSAP value invalid, should not include CR flag bit") - } - - if buf, err := b.PrependBytes(length); err != nil { - return err - } else { - igFlag = 0 - if l.IG { - igFlag = 0x1 - } - - crFlag = 0 - if l.CR { - crFlag = 0x1 - } - - buf[0] = l.DSAP + igFlag - buf[1] = l.SSAP + crFlag - - if length == 4 { - buf[2] = uint8(l.Control >> 8) - buf[3] = uint8(l.Control) - } else { - buf[2] = uint8(l.Control) - } - } - - 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 (s *SNAP) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { - if buf, err := b.PrependBytes(5); err != nil { - return err - } else { - buf[0] = s.OrganizationalCode[0] - buf[1] = s.OrganizationalCode[1] - buf[2] = s.OrganizationalCode[2] - binary.BigEndian.PutUint16(buf[3:5], uint16(s.Type)) - } - - return nil -} |