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 | "encoding/binary" |
| 21 | "encoding/hex" |
| 22 | "fmt" |
| 23 | |
| 24 | "github.com/google/gopacket" |
| 25 | "github.com/google/gopacket/layers" |
| 26 | ) |
| 27 | |
| 28 | // L2switchingDomainRequest is a structure for a request of "L2 Switching Domain/Action Inlet entry" message |
| 29 | type L2switchingDomainRequest struct { |
| 30 | layers.BaseLayer |
| 31 | Opcode uint8 |
| 32 | Flags uint16 |
| 33 | OAMPDUCode uint8 |
| 34 | OUId []byte // Organizationally Unique Identifier: 2a:ea:15 (Tibit Communications) |
| 35 | TOMIOpcode uint8 |
| 36 | CTBranch uint8 |
| 37 | CTType uint16 |
| 38 | CTLength uint8 |
| 39 | CTInstance uint32 |
| 40 | OCBranch uint8 |
| 41 | OCType uint16 |
| 42 | OCLength uint8 |
| 43 | OCInstance uint32 |
| 44 | VcBranch uint8 |
| 45 | VcLeaf uint16 |
| 46 | VcLength uint8 |
| 47 | SOLength uint8 |
| 48 | SOBranch uint8 |
| 49 | SOType uint16 |
| 50 | SOValLength uint8 |
| 51 | SOInstance uint8 |
| 52 | TMLLength uint8 |
| 53 | TMLList []TpidVid |
| 54 | TOPopLength uint8 |
| 55 | TOPopValue uint8 |
| 56 | TOSLength uint8 |
| 57 | TOSList []TpidVid |
| 58 | TOPushLength uint8 |
| 59 | TOPushList []TpidVid |
| 60 | EndBranch uint8 |
| 61 | SizeMargin uint8 |
| 62 | } |
| 63 | |
| 64 | // TpidVid is a structure for TPID/VID set |
| 65 | type TpidVid struct { |
| 66 | Length uint8 |
| 67 | TpIDLength uint8 |
| 68 | TpIDValue []byte |
| 69 | VIdLength uint8 |
| 70 | VIdValue []byte |
| 71 | } |
| 72 | |
| 73 | // String returns the string expression of L2switchingDomainRequest |
| 74 | func (d *L2switchingDomainRequest) String() string { |
| 75 | message := fmt.Sprintf("Opcode:%x, Flags:%x, OAMPDUCode:%x, OUId:%v", d.Opcode, d.Flags, d.OAMPDUCode, hex.EncodeToString(d.OUId)) |
| 76 | message = fmt.Sprintf("%s, TOMIOpcode:%x", message, d.TOMIOpcode) |
| 77 | message = fmt.Sprintf("%s, CTBranch:%x, CTType:%x, CTLength:%x, CTInstance:%x", message, d.CTBranch, d.CTType, d.CTLength, d.CTInstance) |
| 78 | message = fmt.Sprintf("%s, OCBranch:%x, OCType:%x, OCLength:%x, OCInstance:%x", message, d.OCBranch, d.OCType, d.OCLength, d.OCInstance) |
| 79 | message = fmt.Sprintf("%s, VcBranch:%x, VcLeaf:%x, VcLength:%x", message, d.VcBranch, d.VcLeaf, d.VcLength) |
| 80 | message = fmt.Sprintf("%s, SOLength:%x, SOBranch:%x, SOType:%x, SOValLength:%x, SOInstance:%x", message, d.SOLength, d.SOBranch, d.SOType, d.SOValLength, d.SOInstance) |
| 81 | message = fmt.Sprintf("%s, TMLLength:%x", message, d.TMLLength) |
| 82 | for i, tagMatch := range d.TMLList { |
| 83 | message = fmt.Sprintf("%s, %s", message, stringToTpidVid(&tagMatch, i)) |
| 84 | } |
| 85 | message = fmt.Sprintf("%s, TOPopLength:%x, TOPopValue:%x", message, d.TOPopLength, d.TOPopValue) |
| 86 | message = fmt.Sprintf("%s, TOSLength:%x", message, d.TOSLength) |
| 87 | for i, tagOpSet := range d.TOSList { |
| 88 | message = fmt.Sprintf("%s, %s", message, stringToTpidVid(&tagOpSet, i)) |
| 89 | } |
| 90 | message = fmt.Sprintf("%s, TOPushLength:%x", message, d.TOPushLength) |
| 91 | for i, tagOpPush := range d.TOPushList { |
| 92 | message = fmt.Sprintf("%s, %s", message, stringToTpidVid(&tagOpPush, i)) |
| 93 | } |
| 94 | return message |
| 95 | } |
| 96 | |
| 97 | func stringToTpidVid(tpidVid *TpidVid, index int) string { |
| 98 | message := fmt.Sprintf("EC[%v]:{Length:%x, TpIdLength:%x", index, tpidVid.Length, tpidVid.TpIDLength) |
| 99 | if tpidVid.TpIDLength != 128 { |
| 100 | message = fmt.Sprintf("%s, TpIdValue:%v", message, hex.EncodeToString(tpidVid.TpIDValue)) |
| 101 | } |
| 102 | message = fmt.Sprintf("%s, VIdLength:%x", message, tpidVid.VIdLength) |
| 103 | if tpidVid.VIdLength != 128 { |
| 104 | message = fmt.Sprintf("%s, VIdValue:%v", message, hex.EncodeToString(tpidVid.VIdValue)) |
| 105 | } |
| 106 | message = fmt.Sprintf("%s}", message) |
| 107 | return message |
| 108 | } |
| 109 | |
| 110 | // Len returns the length of L2switchingDomainRequest |
| 111 | func (d *L2switchingDomainRequest) Len() int { |
| 112 | return 22 + int(d.CTLength) + int(d.OCLength) + int(d.VcLength) + int(d.SizeMargin) |
| 113 | } |
| 114 | |
| 115 | // LayerType returns the ethernet type of L2switchingDomainRequest |
| 116 | func (d *L2switchingDomainRequest) LayerType() gopacket.LayerType { return layers.LayerTypeEthernet } |
| 117 | |
| 118 | // SerializeTo serializes a data structure to byte arrays |
| 119 | func (d *L2switchingDomainRequest) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { |
| 120 | plen := int(d.Len()) |
| 121 | data, err := b.PrependBytes(plen) |
| 122 | if err != nil { |
| 123 | return err |
| 124 | } |
| 125 | |
| 126 | i := 0 |
| 127 | data[i] = byte(d.Opcode) |
| 128 | i++ |
| 129 | binary.BigEndian.PutUint16(data[i:i+2], d.Flags) |
| 130 | i += 2 |
| 131 | data[i] = byte(d.OAMPDUCode) |
| 132 | i++ |
| 133 | copy(data[i:i+len(d.OUId)], d.OUId) |
| 134 | i += len(d.OUId) |
| 135 | data[i] = byte(d.TOMIOpcode) |
| 136 | i++ |
| 137 | data[i] = byte(d.CTBranch) |
| 138 | i++ |
| 139 | binary.BigEndian.PutUint16(data[i:i+2], d.CTType) |
| 140 | i += 2 |
| 141 | data[i] = byte(d.CTLength) |
| 142 | i++ |
| 143 | binary.BigEndian.PutUint32(data[i:i+4], d.CTInstance) |
| 144 | i += 4 |
| 145 | data[i] = byte(d.OCBranch) |
| 146 | i++ |
| 147 | binary.BigEndian.PutUint16(data[i:i+2], d.OCType) |
| 148 | i += 2 |
| 149 | data[i] = byte(d.OCLength) |
| 150 | i++ |
| 151 | binary.BigEndian.PutUint32(data[i:i+4], d.OCInstance) |
| 152 | i += 4 |
| 153 | data[i] = byte(d.VcBranch) |
| 154 | i++ |
| 155 | binary.BigEndian.PutUint16(data[i:i+2], d.VcLeaf) |
| 156 | i += 2 |
| 157 | data[i] = byte(d.VcLength) |
| 158 | i++ |
| 159 | data[i] = byte(d.SOLength) |
| 160 | i++ |
| 161 | data[i] = byte(d.SOBranch) |
| 162 | i++ |
| 163 | binary.BigEndian.PutUint16(data[i:i+2], d.SOType) |
| 164 | i += 2 |
| 165 | data[i] = byte(d.SOValLength) |
| 166 | i++ |
| 167 | data[i] = byte(d.SOInstance) |
| 168 | i++ |
| 169 | data[i] = byte(d.TMLLength) |
| 170 | i++ |
| 171 | for _, tagMatch := range d.TMLList { |
| 172 | nextIndex := serializeTpidVid(&tagMatch, data, i) |
| 173 | i = nextIndex |
| 174 | } |
| 175 | data[i] = byte(d.TOPopLength) |
| 176 | i++ |
| 177 | data[i] = byte(d.TOPopValue) |
| 178 | i++ |
| 179 | data[i] = byte(d.TOSLength) |
| 180 | i++ |
| 181 | for _, tagOpSet := range d.TOSList { |
| 182 | nextIndex := serializeTpidVid(&tagOpSet, data, i) |
| 183 | i = nextIndex |
| 184 | } |
| 185 | data[i] = d.TOPushLength |
| 186 | i++ |
| 187 | for _, tagOpPush := range d.TOPushList { |
| 188 | nextIndex := serializeTpidVid(&tagOpPush, data, i) |
| 189 | i = nextIndex |
| 190 | } |
| 191 | data[i] = byte(d.EndBranch) |
| 192 | |
| 193 | return nil |
| 194 | } |
| 195 | |
| 196 | func serializeTpidVid(tpidVid *TpidVid, data []byte, startIndex int) int { |
| 197 | i := startIndex |
| 198 | data[i] = tpidVid.Length |
| 199 | i++ |
| 200 | ln := tpidVid.TpIDLength |
| 201 | data[i] = ln |
| 202 | i++ |
| 203 | if ln != 128 { // !Empty? |
| 204 | copy(data[i:i+int(ln)], tpidVid.TpIDValue) |
| 205 | i += int(ln) |
| 206 | } |
| 207 | ln = tpidVid.VIdLength |
| 208 | data[i] = ln |
| 209 | i++ |
| 210 | if ln != 128 { // !Empty? |
| 211 | copy(data[i:i+int(ln)], tpidVid.VIdValue) |
| 212 | i += int(ln) |
| 213 | } |
| 214 | return i |
| 215 | } |