Takahiro Suzuki | d7bf820 | 2020-12-17 20:21:59 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2020-present Open Networking Foundation |
| 3 | |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package l2oam |
| 18 | |
| 19 | import ( |
| 20 | "net" |
| 21 | "sync" |
| 22 | |
| 23 | "github.com/google/gopacket" |
| 24 | "github.com/google/gopacket/layers" |
| 25 | ) |
| 26 | |
| 27 | // OnuPkgType describes target package type |
| 28 | var OnuPkgType = "PkgB" |
| 29 | |
| 30 | // OnuPkgTypeA is a constant of package |
| 31 | const OnuPkgTypeA = "PkgA" |
| 32 | |
| 33 | // OnuPkgTypeB is a constant of package |
| 34 | const OnuPkgTypeB = "PkgB" |
| 35 | |
| 36 | // TibitFrame is a typical structure of a frame |
| 37 | type TibitFrame struct { |
| 38 | layers.BaseLayer |
| 39 | Data []byte |
| 40 | } |
| 41 | |
| 42 | // LayerType returns ethernet layer type |
| 43 | func (t *TibitFrame) LayerType() gopacket.LayerType { return layers.LayerTypeEthernet } |
| 44 | |
| 45 | // SerializeTo serializes a data structure to byte arrays |
| 46 | func (t *TibitFrame) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { |
| 47 | length := len(t.Data) |
| 48 | bytes, err := b.PrependBytes(length) |
| 49 | if err != nil { |
| 50 | return err |
| 51 | } |
| 52 | copy(bytes, t.Data) |
| 53 | return nil |
| 54 | } |
| 55 | |
| 56 | // TomiObjectContext is a structure for tomi object |
| 57 | type TomiObjectContext struct { |
| 58 | Branch uint8 |
| 59 | Type uint16 |
| 60 | Length uint8 |
| 61 | Instance uint32 |
| 62 | } |
| 63 | |
| 64 | // CreateMessage creates l2 message |
| 65 | func CreateMessage(srcMac string, dstMac string, ethernetType layers.EthernetType, tibitData gopacket.SerializableLayer) []byte { |
| 66 | srcMAC, _ := net.ParseMAC(srcMac) |
| 67 | dstMAC, _ := net.ParseMAC(dstMac) |
| 68 | |
| 69 | ethernetLayer := &layers.Ethernet{ |
| 70 | SrcMAC: srcMAC, |
| 71 | DstMAC: dstMAC, |
| 72 | EthernetType: ethernetType, |
| 73 | } |
| 74 | |
| 75 | buf := gopacket.NewSerializeBuffer() |
| 76 | if err := gopacket.SerializeLayers( |
| 77 | buf, |
| 78 | gopacket.SerializeOptions{ |
| 79 | ComputeChecksums: true, |
| 80 | FixLengths: true, |
| 81 | }, |
| 82 | ethernetLayer, |
| 83 | tibitData, |
| 84 | ); err != nil { |
| 85 | return buf.Bytes() |
| 86 | } |
| 87 | return buf.Bytes() |
| 88 | } |
| 89 | |
| 90 | // CreateMessage creates vlan message |
| 91 | func CreateMessageVlan(srcMac string, dstMac string, ethernetType layers.EthernetType, tibitData gopacket.SerializableLayer, vlanLayer *layers.Dot1Q) []byte { |
| 92 | srcMAC, _ := net.ParseMAC(srcMac) |
| 93 | dstMAC, _ := net.ParseMAC(dstMac) |
| 94 | |
| 95 | ethernetLayer := &layers.Ethernet{ |
| 96 | SrcMAC: srcMAC, |
| 97 | DstMAC: dstMAC, |
| 98 | EthernetType: ethernetType, |
| 99 | } |
| 100 | |
| 101 | buf := gopacket.NewSerializeBuffer() |
| 102 | if err := gopacket.SerializeLayers( |
| 103 | buf, |
| 104 | gopacket.SerializeOptions{ |
| 105 | ComputeChecksums: true, |
| 106 | FixLengths: true, |
| 107 | }, |
| 108 | ethernetLayer, |
| 109 | vlanLayer, |
| 110 | tibitData, |
| 111 | ); err != nil { |
| 112 | return buf.Bytes() |
| 113 | } |
| 114 | return buf.Bytes() |
| 115 | } |
| 116 | |
| 117 | // CorrelationTag instance ID |
| 118 | // It is incremented automatically for each TOMI message with OLT |
| 119 | var instance uint32 = 0x5c1f6a60 |
| 120 | var instanceMutex sync.Mutex |
| 121 | |
| 122 | func getOltInstance() uint32 { |
| 123 | instanceMutex.Lock() |
| 124 | defer instanceMutex.Unlock() |
| 125 | instance = instance + 1 |
| 126 | |
| 127 | return instance |
| 128 | |
| 129 | } |