Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2018-present Open Networking Foundation |
| 3 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | * you may not use this file except in compliance with the License. |
| 5 | * You may obtain a copy of the License at |
| 6 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 7 | * Unless required by applicable law or agreed to in writing, software |
| 8 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 9 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 10 | * See the License for the specific language governing permissions and |
| 11 | * limitations under the License. |
| 12 | */ |
| 13 | |
| 14 | package igmp |
| 15 | |
| 16 | import ( |
| 17 | "encoding/binary" |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 18 | "encoding/hex" |
| 19 | "errors" |
| 20 | "github.com/opencord/bbsim/internal/bbsim/packetHandlers" |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 21 | "net" |
| 22 | "time" |
| 23 | |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 24 | "github.com/google/gopacket" |
| 25 | "github.com/google/gopacket/layers" |
| 26 | bbsim "github.com/opencord/bbsim/internal/bbsim/types" |
Matteo Scandolo | 4f4ac79 | 2020-10-01 16:33:21 -0700 | [diff] [blame^] | 27 | "github.com/opencord/voltha-protos/v4/go/openolt" |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 28 | log "github.com/sirupsen/logrus" |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 29 | ) |
| 30 | |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 31 | func SendIGMPLeaveGroupV2(ponPortId uint32, onuId uint32, serialNumber string, portNo uint32, |
| 32 | gemPortId uint32, macAddress net.HardwareAddr, cTag int, pbit uint8, stream bbsim.Stream) error { |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 33 | log.WithFields(log.Fields{ |
| 34 | "OnuId": onuId, |
| 35 | "SerialNumber": serialNumber, |
| 36 | "PortNo": portNo, |
| 37 | }).Debugf("Entered SendIGMPLeaveGroupV2") |
| 38 | igmp := createIGMPV2LeaveRequestPacket() |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 39 | pkt, err := serializeIgmpPacket(ponPortId, onuId, cTag, macAddress, pbit, igmp) |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 40 | |
| 41 | if err != nil { |
| 42 | log.WithFields(log.Fields{ |
| 43 | "OnuId": onuId, |
| 44 | "IntfId": ponPortId, |
| 45 | "SerialNumber": serialNumber, |
| 46 | }).Errorf("Seriliazation of igmp packet failed : %s", err) |
| 47 | return err |
| 48 | } |
| 49 | |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 50 | data := &openolt.Indication_PktInd{ |
| 51 | PktInd: &openolt.PacketIndication{ |
| 52 | IntfType: "pon", |
| 53 | IntfId: ponPortId, |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 54 | GemportId: gemPortId, |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 55 | Pkt: pkt, |
| 56 | PortNo: portNo, |
| 57 | }, |
| 58 | } |
| 59 | //Sending IGMP packets |
| 60 | if err := stream.Send(&openolt.Indication{Data: data}); err != nil { |
Matteo Scandolo | 583f17d | 2020-02-13 10:35:17 -0800 | [diff] [blame] | 61 | log.WithFields(log.Fields{ |
| 62 | "OnuId": onuId, |
| 63 | "SerialNumber": serialNumber, |
| 64 | "PortNo": portNo, |
| 65 | "IntfId": ponPortId, |
| 66 | "err": err, |
| 67 | }).Error("Fail to send IGMP PktInd indication for ONU") |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 68 | return err |
| 69 | } |
| 70 | return nil |
| 71 | } |
| 72 | |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 73 | func SendIGMPMembershipReportV2(ponPortId uint32, onuId uint32, serialNumber string, portNo uint32, |
| 74 | gemPortId uint32, macAddress net.HardwareAddr, cTag int, pbit uint8, stream bbsim.Stream) error { |
| 75 | |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 76 | igmp := createIGMPV2MembershipReportPacket() |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 77 | pkt, err := serializeIgmpPacket(ponPortId, onuId, cTag, macAddress, pbit, igmp) |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 78 | |
| 79 | if err != nil { |
| 80 | log.WithFields(log.Fields{ |
| 81 | "OnuId": onuId, |
| 82 | "IntfId": ponPortId, |
| 83 | "SerialNumber": serialNumber, |
| 84 | }).Errorf("Seriliazation of igmp packet failed : %s", err) |
| 85 | return err |
| 86 | } |
| 87 | |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 88 | data := &openolt.Indication_PktInd{ |
| 89 | PktInd: &openolt.PacketIndication{ |
| 90 | IntfType: "pon", |
| 91 | IntfId: ponPortId, |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 92 | GemportId: gemPortId, |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 93 | Pkt: pkt, |
| 94 | PortNo: portNo, |
| 95 | }, |
| 96 | } |
| 97 | //Sending IGMP packets |
| 98 | if err := stream.Send(&openolt.Indication{Data: data}); err != nil { |
Matteo Scandolo | 583f17d | 2020-02-13 10:35:17 -0800 | [diff] [blame] | 99 | log.WithFields(log.Fields{ |
| 100 | "OnuId": onuId, |
| 101 | "SerialNumber": serialNumber, |
| 102 | "PortNo": portNo, |
| 103 | "IntfId": ponPortId, |
| 104 | "err": err, |
| 105 | }).Errorf("Fail to send IGMP PktInd indication") |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 106 | return err |
| 107 | } |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 108 | |
| 109 | log.WithFields(log.Fields{ |
| 110 | "OnuId": onuId, |
| 111 | "SerialNumber": serialNumber, |
| 112 | "PortNo": portNo, |
| 113 | }).Debugf("Sent SendIGMPMembershipReportV2") |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 114 | return nil |
| 115 | } |
| 116 | |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 117 | func SendIGMPMembershipReportV3(ponPortId uint32, onuId uint32, serialNumber string, portNo uint32, |
| 118 | gemPortId uint32, macAddress net.HardwareAddr, cTag int, pbit uint8, stream bbsim.Stream) error { |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 119 | log.WithFields(log.Fields{ |
| 120 | "OnuId": onuId, |
| 121 | "SerialNumber": serialNumber, |
| 122 | "PortNo": portNo, |
| 123 | }).Debugf("Entered SendIGMPMembershipReportV3") |
| 124 | igmp := createIGMPV3MembershipReportPacket() |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 125 | pkt, err := serializeIgmpPacket(ponPortId, onuId, cTag, macAddress, pbit, igmp) |
Arjun E K | dd443f0 | 2020-02-07 15:24:01 +0000 | [diff] [blame] | 126 | |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 127 | if err != nil { |
| 128 | log.WithFields(log.Fields{ |
| 129 | "OnuId": onuId, |
| 130 | "IntfId": ponPortId, |
| 131 | "SerialNumber": serialNumber, |
| 132 | }).Errorf("Seriliazation of igmp packet failed : %s", err) |
| 133 | return err |
| 134 | } |
Arjun E K | dd443f0 | 2020-02-07 15:24:01 +0000 | [diff] [blame] | 135 | |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 136 | data := &openolt.Indication_PktInd{ |
| 137 | PktInd: &openolt.PacketIndication{ |
| 138 | IntfType: "pon", |
| 139 | IntfId: ponPortId, |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 140 | GemportId: gemPortId, |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 141 | Pkt: pkt, |
| 142 | PortNo: portNo, |
| 143 | }, |
| 144 | } |
| 145 | //Sending IGMP packets |
| 146 | if err := stream.Send(&openolt.Indication{Data: data}); err != nil { |
Matteo Scandolo | 446fc9e | 2020-03-13 15:48:13 -0700 | [diff] [blame] | 147 | log.WithFields(log.Fields{ |
| 148 | "OnuId": onuId, |
| 149 | "IntfId": ponPortId, |
| 150 | "SerialNumber": serialNumber, |
| 151 | "err": err, |
| 152 | }).Errorf("Fail to send IGMP PktInd indication") |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 153 | return err |
| 154 | } |
| 155 | return nil |
Arjun E K | dd443f0 | 2020-02-07 15:24:01 +0000 | [diff] [blame] | 156 | } |
| 157 | |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 158 | func HandleNextPacket(ponPortId uint32, onuId uint32, serialNumber string, portNo uint32, |
| 159 | gemPortId uint32, macAddress net.HardwareAddr, pkt gopacket.Packet, cTag int, pbit uint8, stream bbsim.Stream) error { |
| 160 | |
| 161 | igmpLayer := pkt.Layer(layers.LayerTypeIGMP) |
| 162 | if igmpLayer == nil { |
| 163 | log.WithFields(log.Fields{ |
| 164 | "OnuId": onuId, |
| 165 | "SerialNumber": serialNumber, |
| 166 | "PortNo": portNo, |
| 167 | "Pkt": hex.EncodeToString(pkt.Data()), |
| 168 | }).Error("This is not an IGMP packet") |
| 169 | return errors.New("packet-is-not-igmp") |
| 170 | } |
| 171 | |
| 172 | log.WithFields(log.Fields{ |
| 173 | "Pkt": pkt.Data(), |
| 174 | }).Trace("IGMP packet") |
| 175 | |
| 176 | igmp := igmpLayer.(*layers.IGMPv1or2) |
| 177 | |
| 178 | if igmp.Type == layers.IGMPMembershipQuery { |
| 179 | _ = SendIGMPMembershipReportV2(ponPortId, onuId, serialNumber, portNo, gemPortId, macAddress, cTag, pbit, stream) |
| 180 | } |
| 181 | |
| 182 | return nil |
| 183 | } |
| 184 | |
| 185 | func createIGMPV3MembershipReportPacket() *IGMP { |
Arjun E K | dd443f0 | 2020-02-07 15:24:01 +0000 | [diff] [blame] | 186 | |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 187 | groupRecord1 := IGMPv3GroupRecord{ |
| 188 | Type: IGMPv3GroupRecordType(IGMPIsIn), |
| 189 | AuxDataLen: 0, // this should always be 0 as per IGMPv3 spec. |
| 190 | NumberOfSources: 3, |
| 191 | MulticastAddress: net.IPv4(224, 0, 0, 22), |
| 192 | SourceAddresses: []net.IP{net.IPv4(15, 14, 20, 24), net.IPv4(15, 14, 20, 26), net.IPv4(15, 14, 20, 25)}, |
| 193 | AuxData: 0, // NOT USED |
| 194 | } |
Arjun E K | dd443f0 | 2020-02-07 15:24:01 +0000 | [diff] [blame] | 195 | |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 196 | groupRecord2 := IGMPv3GroupRecord{ |
| 197 | Type: IGMPv3GroupRecordType(IGMPIsIn), |
| 198 | AuxDataLen: 0, // this should always be 0 as per IGMPv3 spec. |
| 199 | NumberOfSources: 2, |
| 200 | MulticastAddress: net.IPv4(224, 0, 0, 25), |
| 201 | SourceAddresses: []net.IP{net.IPv4(15, 14, 20, 30), net.IPv4(15, 14, 20, 31)}, |
| 202 | AuxData: 0, // NOT USED |
| 203 | } |
Arjun E K | dd443f0 | 2020-02-07 15:24:01 +0000 | [diff] [blame] | 204 | |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 205 | igmpDefault := &IGMP{ |
| 206 | Type: layers.IGMPMembershipReportV3, //IGMPV3 Membership Report |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 207 | MaxResponseTime: time.Duration(1), |
| 208 | Checksum: 0, |
| 209 | GroupAddress: net.IPv4(224, 0, 0, 22), |
| 210 | SupressRouterProcessing: false, |
| 211 | RobustnessValue: 0, |
| 212 | IntervalTime: time.Duration(1), |
| 213 | SourceAddresses: []net.IP{net.IPv4(224, 0, 0, 24)}, |
| 214 | NumberOfGroupRecords: 2, |
| 215 | NumberOfSources: 1, |
| 216 | GroupRecords: []IGMPv3GroupRecord{groupRecord1, groupRecord2}, |
| 217 | Version: 3, |
| 218 | } |
Arjun E K | dd443f0 | 2020-02-07 15:24:01 +0000 | [diff] [blame] | 219 | |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 220 | return igmpDefault |
Arjun E K | dd443f0 | 2020-02-07 15:24:01 +0000 | [diff] [blame] | 221 | } |
| 222 | |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 223 | func createIGMPV2MembershipReportPacket() *IGMP { |
| 224 | return &IGMP{ |
| 225 | Type: layers.IGMPMembershipReportV2, //IGMPV2 Membership Report |
| 226 | Checksum: 0, |
| 227 | GroupAddress: net.IPv4(224, 0, 0, 22), |
| 228 | Version: 2, |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | func createIGMPV2LeaveRequestPacket() *IGMP { |
| 233 | return &IGMP{ |
| 234 | Type: layers.IGMPLeaveGroup, //IGMPV2 Leave Group |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 235 | MaxResponseTime: time.Duration(1), |
| 236 | Checksum: 0, |
| 237 | GroupAddress: net.IPv4(224, 0, 0, 22), |
| 238 | Version: 2, |
| 239 | } |
| 240 | } |
| 241 | |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 242 | func serializeIgmpPacket(intfId uint32, onuId uint32, cTag int, srcMac net.HardwareAddr, pbit uint8, igmp *IGMP) ([]byte, error) { |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 243 | buffer := gopacket.NewSerializeBuffer() |
| 244 | options := gopacket.SerializeOptions{ |
| 245 | ComputeChecksums: true, |
| 246 | FixLengths: true, |
| 247 | } |
| 248 | |
| 249 | ethernetLayer := &layers.Ethernet{ |
| 250 | SrcMAC: srcMac, |
| 251 | DstMAC: net.HardwareAddr{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, |
| 252 | EthernetType: layers.EthernetTypeIPv4, |
| 253 | } |
| 254 | |
| 255 | ipLayer := &layers.IPv4{ |
| 256 | Version: 4, |
| 257 | TOS: 0x10, |
| 258 | Id: 0, |
| 259 | TTL: 128, |
| 260 | SrcIP: []byte{0, 0, 0, 0}, |
| 261 | DstIP: []byte{224, 0, 0, 22}, |
| 262 | Protocol: layers.IPProtocolIGMP, |
| 263 | Options: []layers.IPv4Option{{OptionType: 148, OptionLength: 4, OptionData: make([]byte, 0)}}, //Adding router alert option |
| 264 | } |
| 265 | |
| 266 | if err := gopacket.SerializeLayers(buffer, options, ethernetLayer, ipLayer, igmp); err != nil { |
| 267 | return nil, err |
| 268 | } |
| 269 | |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 270 | untaggedPkt := gopacket.NewPacket(buffer.Bytes(), layers.LayerTypeEthernet, gopacket.Default) |
| 271 | taggedPkt, err := packetHandlers.PushSingleTag(cTag, untaggedPkt, pbit) |
| 272 | |
| 273 | if err != nil { |
| 274 | log.Error("TagPacket") |
| 275 | return nil, err |
| 276 | } |
| 277 | |
| 278 | return taggedPkt.Data(), nil |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 279 | } |
| 280 | |
| 281 | //-----------------------------------------***********************--------------------------------- |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 282 | |
| 283 | type IGMP struct { |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 284 | layers.BaseLayer |
| 285 | Type layers.IGMPType |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 286 | MaxResponseTime time.Duration |
| 287 | Checksum uint16 |
| 288 | GroupAddress net.IP |
| 289 | SupressRouterProcessing bool |
| 290 | RobustnessValue uint8 |
| 291 | IntervalTime time.Duration |
| 292 | SourceAddresses []net.IP |
| 293 | NumberOfGroupRecords uint16 |
| 294 | NumberOfSources uint16 |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 295 | GroupRecords []IGMPv3GroupRecord |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 296 | Version uint8 // IGMP protocol version |
| 297 | } |
| 298 | |
Arjun E K | dd443f0 | 2020-02-07 15:24:01 +0000 | [diff] [blame] | 299 | // IGMPv3GroupRecord stores individual group records for a V3 Membership Report message. |
| 300 | type IGMPv3GroupRecord struct { |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 301 | Type IGMPv3GroupRecordType |
| 302 | AuxDataLen uint8 // this should always be 0 as per IGMPv3 spec. |
| 303 | NumberOfSources uint16 |
| 304 | MulticastAddress net.IP |
| 305 | SourceAddresses []net.IP |
| 306 | AuxData uint32 // NOT USED |
Arjun E K | dd443f0 | 2020-02-07 15:24:01 +0000 | [diff] [blame] | 307 | } |
| 308 | |
| 309 | type IGMPv3GroupRecordType uint8 |
| 310 | |
| 311 | const ( |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 312 | IGMPIsIn IGMPv3GroupRecordType = 0x01 // Type MODE_IS_INCLUDE, source addresses x |
| 313 | IGMPIsEx IGMPv3GroupRecordType = 0x02 // Type MODE_IS_EXCLUDE, source addresses x |
| 314 | IGMPToIn IGMPv3GroupRecordType = 0x03 // Type CHANGE_TO_INCLUDE_MODE, source addresses x |
| 315 | IGMPToEx IGMPv3GroupRecordType = 0x04 // Type CHANGE_TO_EXCLUDE_MODE, source addresses x |
| 316 | IGMPAllow IGMPv3GroupRecordType = 0x05 // Type ALLOW_NEW_SOURCES, source addresses x |
| 317 | IGMPBlock IGMPv3GroupRecordType = 0x06 // Type BLOCK_OLD_SOURCES, source addresses x |
Arjun E K | dd443f0 | 2020-02-07 15:24:01 +0000 | [diff] [blame] | 318 | ) |
| 319 | |
| 320 | func (i IGMPv3GroupRecordType) String() string { |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 321 | switch i { |
| 322 | case IGMPIsIn: |
| 323 | return "MODE_IS_INCLUDE" |
| 324 | case IGMPIsEx: |
| 325 | return "MODE_IS_EXCLUDE" |
| 326 | case IGMPToIn: |
| 327 | return "CHANGE_TO_INCLUDE_MODE" |
| 328 | case IGMPToEx: |
| 329 | return "CHANGE_TO_EXCLUDE_MODE" |
| 330 | case IGMPAllow: |
| 331 | return "ALLOW_NEW_SOURCES" |
| 332 | case IGMPBlock: |
| 333 | return "BLOCK_OLD_SOURCES" |
| 334 | default: |
| 335 | return "" |
| 336 | } |
Arjun E K | dd443f0 | 2020-02-07 15:24:01 +0000 | [diff] [blame] | 337 | } |
| 338 | |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 339 | // SerializeTo writes the serialized form of this layer into the |
| 340 | // SerializationBuffer, implementing gopacket.SerializableLayer. |
| 341 | // See the docs for gopacket.SerializableLayer for more info. |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 342 | func (igmp *IGMP) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error { |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 343 | data, err := b.PrependBytes(8915) |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 344 | if err != nil { |
| 345 | return err |
| 346 | } |
| 347 | if igmp.Version == 2 { |
| 348 | data[0] = byte(igmp.Type) |
| 349 | data[1] = byte(igmp.MaxResponseTime) |
| 350 | data[2] = 0 |
| 351 | data[3] = 0 |
| 352 | copy(data[4:8], igmp.GroupAddress.To4()) |
| 353 | if opts.ComputeChecksums { |
| 354 | igmp.Checksum = tcpipChecksum(data, 0) |
| 355 | binary.BigEndian.PutUint16(data[2:4], igmp.Checksum) |
| 356 | } |
| 357 | } else if igmp.Version == 3 { |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 358 | |
Anand S Katti | 0954135 | 2020-01-29 15:54:01 +0530 | [diff] [blame] | 359 | data[0] = byte(igmp.Type) |
| 360 | data[1] = 0 |
| 361 | data[2] = 0 |
| 362 | data[3] = 0 |
| 363 | data[4] = 0 |
| 364 | data[5] = 0 |
| 365 | binary.BigEndian.PutUint16(data[6:8], igmp.NumberOfGroupRecords) |
| 366 | j := 8 |
| 367 | for i := uint16(0); i < igmp.NumberOfGroupRecords; i++ { |
| 368 | data[j] = byte(igmp.GroupRecords[i].Type) |
| 369 | data[j+1] = byte(0) |
| 370 | binary.BigEndian.PutUint16(data[j+2:j+4], igmp.GroupRecords[i].NumberOfSources) |
| 371 | copy(data[j+4:j+8], igmp.GroupRecords[i].MulticastAddress.To4()) |
| 372 | j = j + 8 |
| 373 | for m := uint16(0); m < igmp.GroupRecords[i].NumberOfSources; m++ { |
| 374 | copy(data[j:(j+4)], igmp.GroupRecords[i].SourceAddresses[m].To4()) |
| 375 | j = j + 4 |
| 376 | } |
| 377 | } |
| 378 | if opts.ComputeChecksums { |
| 379 | igmp.Checksum = tcpipChecksum(data, 0) |
| 380 | binary.BigEndian.PutUint16(data[2:4], igmp.Checksum) |
| 381 | } |
| 382 | } |
| 383 | return nil |
Arjun E K | 57a7fcb | 2020-01-30 06:44:45 +0000 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | // Calculate the TCP/IP checksum defined in rfc1071. The passed-in csum is any |
| 387 | // initial checksum data that's already been computed. |
| 388 | func tcpipChecksum(data []byte, csum uint32) uint16 { |
| 389 | // to handle odd lengths, we loop to length - 1, incrementing by 2, then |
| 390 | // handle the last byte specifically by checking against the original |
| 391 | // length. |
| 392 | length := len(data) - 1 |
| 393 | for i := 0; i < length; i += 2 { |
| 394 | // For our test packet, doing this manually is about 25% faster |
| 395 | // (740 ns vs. 1000ns) than doing it by calling binary.BigEndian.Uint16. |
| 396 | csum += uint32(data[i]) << 8 |
| 397 | csum += uint32(data[i+1]) |
| 398 | } |
| 399 | if len(data)%2 == 1 { |
| 400 | csum += uint32(data[length]) << 8 |
| 401 | } |
| 402 | for csum > 0xffff { |
| 403 | csum = (csum >> 16) + (csum & 0xffff) |
| 404 | } |
| 405 | return ^uint16(csum) |
| 406 | } |
| 407 | |
Matteo Scandolo | 618a658 | 2020-09-09 12:21:29 -0700 | [diff] [blame] | 408 | func (i *IGMP) LayerType() gopacket.LayerType { return layers.LayerTypeIGMP } |
| 409 | func (i *IGMP) LayerContents() []byte { return i.Contents } |
| 410 | func (i *IGMP) LayerPayload() []byte { return i.Payload } |