Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2018-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 dhcp |
| 18 | |
| 19 | import ( |
| 20 | "errors" |
| 21 | "fmt" |
| 22 | "github.com/google/gopacket" |
| 23 | "github.com/google/gopacket/layers" |
| 24 | "github.com/looplab/fsm" |
| 25 | bbsim "github.com/opencord/bbsim/internal/bbsim/types" |
| 26 | omci "github.com/opencord/omci-sim" |
| 27 | "github.com/opencord/voltha-protos/go/openolt" |
| 28 | log "github.com/sirupsen/logrus" |
| 29 | "net" |
| 30 | "reflect" |
| 31 | ) |
| 32 | |
| 33 | var dhcpLogger = log.WithFields(log.Fields{ |
| 34 | "module": "DHCP", |
| 35 | }) |
| 36 | |
| 37 | var defaultParamsRequestList = []layers.DHCPOpt{ |
| 38 | layers.DHCPOptSubnetMask, |
| 39 | layers.DHCPOptBroadcastAddr, |
| 40 | layers.DHCPOptTimeOffset, |
| 41 | layers.DHCPOptRouter, |
| 42 | layers.DHCPOptDomainName, |
| 43 | layers.DHCPOptDNS, |
| 44 | layers.DHCPOptDomainSearch, |
| 45 | layers.DHCPOptHostname, |
| 46 | layers.DHCPOptNetBIOSTCPNS, |
| 47 | layers.DHCPOptNetBIOSTCPScope, |
| 48 | layers.DHCPOptInterfaceMTU, |
| 49 | layers.DHCPOptClasslessStaticRoute, |
| 50 | layers.DHCPOptNTPServers, |
| 51 | } |
| 52 | |
| 53 | func createDefaultDHCPReq(intfId uint32, onuId uint32) layers.DHCPv4 { |
| 54 | return layers.DHCPv4{ |
| 55 | Operation: layers.DHCPOpRequest, |
| 56 | HardwareType: layers.LinkTypeEthernet, |
| 57 | HardwareLen: 6, |
| 58 | HardwareOpts: 0, |
| 59 | Xid: onuId, |
| 60 | ClientHWAddr: net.HardwareAddr{0x2e, 0x60, 0x70, 0x13, byte(intfId), byte(onuId)}, |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | func createDefaultOpts() []layers.DHCPOption { |
| 65 | hostname := []byte("bbsim.onf.org") |
| 66 | opts := []layers.DHCPOption{} |
| 67 | opts = append(opts, layers.DHCPOption{ |
| 68 | Type: layers.DHCPOptHostname, |
| 69 | Data: hostname, |
| 70 | Length: uint8(len(hostname)), |
| 71 | }) |
| 72 | |
| 73 | bytes := []byte{} |
| 74 | for _, option := range defaultParamsRequestList { |
| 75 | bytes = append(bytes, byte(option)) |
| 76 | } |
| 77 | |
| 78 | opts = append(opts, layers.DHCPOption{ |
| 79 | Type: layers.DHCPOptParamsRequest, |
| 80 | Data: bytes, |
| 81 | Length: uint8(len(bytes)), |
| 82 | }) |
| 83 | return opts |
| 84 | } |
| 85 | |
| 86 | func createDHCPDisc(intfId uint32, onuId uint32) *layers.DHCPv4 { |
| 87 | dhcpLayer := createDefaultDHCPReq(intfId, onuId) |
| 88 | defaultOpts := createDefaultOpts() |
| 89 | dhcpLayer.Options = append([]layers.DHCPOption{layers.DHCPOption{ |
| 90 | Type: layers.DHCPOptMessageType, |
| 91 | Data: []byte{byte(layers.DHCPMsgTypeDiscover)}, |
| 92 | Length: 1, |
| 93 | }}, defaultOpts...) |
| 94 | |
| 95 | return &dhcpLayer |
| 96 | } |
| 97 | |
| 98 | func createDHCPReq(intfId uint32, onuId uint32) *layers.DHCPv4 { |
| 99 | dhcpLayer := createDefaultDHCPReq(intfId, onuId) |
| 100 | defaultOpts := createDefaultOpts() |
| 101 | |
| 102 | dhcpLayer.Options = append(defaultOpts, layers.DHCPOption{ |
| 103 | Type: layers.DHCPOptMessageType, |
| 104 | Data: []byte{byte(layers.DHCPMsgTypeRequest)}, |
| 105 | Length: 1, |
| 106 | }) |
| 107 | |
| 108 | data := []byte{182, 21, 0, 128} |
| 109 | dhcpLayer.Options = append(dhcpLayer.Options, layers.DHCPOption{ |
| 110 | Type: layers.DHCPOptServerID, |
| 111 | Data: data, |
| 112 | Length: uint8(len(data)), |
| 113 | }) |
| 114 | |
| 115 | data = []byte{0xcd, 0x28, 0xcb, 0xcc, 0x00, 0x01, 0x00, 0x01, |
| 116 | 0x23, 0xed, 0x11, 0xec, 0x4e, 0xfc, 0xcd, 0x28, 0xcb, 0xcc} |
| 117 | dhcpLayer.Options = append(dhcpLayer.Options, layers.DHCPOption{ |
| 118 | Type: layers.DHCPOptClientID, |
| 119 | Data: data, |
| 120 | Length: uint8(len(data)), |
| 121 | }) |
| 122 | |
| 123 | data = []byte{182, 21, 0, byte(onuId)} |
| 124 | dhcpLayer.Options = append(dhcpLayer.Options, layers.DHCPOption{ |
| 125 | Type: layers.DHCPOptRequestIP, |
| 126 | Data: data, |
| 127 | Length: uint8(len(data)), |
| 128 | }) |
| 129 | return &dhcpLayer |
| 130 | } |
| 131 | |
| 132 | func serializeDHCPPacket(intfId uint32, onuId uint32, srcMac net.HardwareAddr, dhcp *layers.DHCPv4) ([]byte, error) { |
| 133 | buffer := gopacket.NewSerializeBuffer() |
| 134 | options := gopacket.SerializeOptions{ |
| 135 | ComputeChecksums: true, |
| 136 | FixLengths: true, |
| 137 | } |
| 138 | |
| 139 | ethernetLayer := &layers.Ethernet{ |
| 140 | SrcMAC: srcMac, |
| 141 | DstMAC: net.HardwareAddr{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, |
| 142 | EthernetType: layers.EthernetTypeIPv4, |
| 143 | } |
| 144 | |
| 145 | ipLayer := &layers.IPv4{ |
| 146 | Version: 4, |
| 147 | TOS: 0x10, |
| 148 | TTL: 128, |
| 149 | SrcIP: []byte{0, 0, 0, 0}, |
| 150 | DstIP: []byte{255, 255, 255, 255}, |
| 151 | Protocol: layers.IPProtocolUDP, |
| 152 | } |
| 153 | |
| 154 | udpLayer := &layers.UDP{ |
| 155 | SrcPort: 68, |
| 156 | DstPort: 67, |
| 157 | } |
| 158 | |
| 159 | udpLayer.SetNetworkLayerForChecksum(ipLayer) |
| 160 | if err := gopacket.SerializeLayers(buffer, options, ethernetLayer, ipLayer, udpLayer, dhcp); err != nil { |
| 161 | return nil, err |
| 162 | } |
| 163 | |
| 164 | bytes := buffer.Bytes() |
| 165 | return bytes, nil |
| 166 | } |
| 167 | |
| 168 | func getDhcpLayer(pkt gopacket.Packet) (*layers.DHCPv4, error) { |
| 169 | layerDHCP := pkt.Layer(layers.LayerTypeDHCPv4) |
| 170 | dhcp, _ := layerDHCP.(*layers.DHCPv4) |
| 171 | if dhcp == nil { |
| 172 | return nil, errors.New("Failed-to-extract-DHCP-layer") |
| 173 | } |
| 174 | return dhcp, nil |
| 175 | } |
| 176 | |
| 177 | func getDhcpMessageType(dhcp *layers.DHCPv4) (layers.DHCPMsgType, error) { |
| 178 | for _, option := range dhcp.Options { |
| 179 | if option.Type == layers.DHCPOptMessageType { |
| 180 | if reflect.DeepEqual(option.Data, []byte{byte(layers.DHCPMsgTypeOffer)}) { |
| 181 | return layers.DHCPMsgTypeOffer, nil |
| 182 | } else if reflect.DeepEqual(option.Data, []byte{byte(layers.DHCPMsgTypeAck)}) { |
| 183 | return layers.DHCPMsgTypeAck, nil |
| 184 | } else if reflect.DeepEqual(option.Data, []byte{byte(layers.DHCPMsgTypeRelease)}) { |
| 185 | return layers.DHCPMsgTypeRelease, nil |
| 186 | } else { |
| 187 | msg := fmt.Sprintf("This type %x is not supported", option.Data) |
| 188 | return 0, errors.New(msg) |
| 189 | } |
| 190 | } |
| 191 | } |
| 192 | return 0, errors.New("Failed to extract MsgType from dhcp") |
| 193 | } |
| 194 | |
| 195 | func sendDHCPPktIn(msg bbsim.ByteMsg, stream openolt.Openolt_EnableIndicationServer) error { |
| 196 | // FIXME unify sendDHCPPktIn and sendEapolPktIn methods |
| 197 | gemid, err := omci.GetGemPortId(msg.IntfId, msg.OnuId) |
| 198 | if err != nil { |
| 199 | dhcpLogger.WithFields(log.Fields{ |
| 200 | "OnuId": msg.OnuId, |
| 201 | "IntfId": msg.IntfId, |
| 202 | }).Errorf("Can't retrieve GemPortId: %s", err) |
| 203 | return err |
| 204 | } |
| 205 | data := &openolt.Indication_PktInd{PktInd: &openolt.PacketIndication{ |
| 206 | IntfType: "pon", IntfId: msg.IntfId, GemportId: uint32(gemid), Pkt: msg.Bytes, |
| 207 | }} |
| 208 | |
| 209 | if err := stream.Send(&openolt.Indication{Data: data}); err != nil { |
| 210 | dhcpLogger.Errorf("Fail to send DHCP PktInd indication. %v", err) |
| 211 | return err |
| 212 | } |
| 213 | return nil |
| 214 | } |
| 215 | |
| 216 | func sendDHCPDiscovery(ponPortId uint32, onuId uint32, serialNumber string, onuHwAddress net.HardwareAddr, cTag int, stream openolt.Openolt_EnableIndicationServer) error { |
| 217 | dhcp := createDHCPDisc(ponPortId, onuId) |
| 218 | pkt, err := serializeDHCPPacket(ponPortId, onuId, onuHwAddress, dhcp) |
| 219 | if err != nil { |
| 220 | dhcpLogger.Errorf("Cannot serializeDHCPPacket: %s", err) |
| 221 | return err |
| 222 | } |
| 223 | // NOTE I don't think we need to tag the packet |
| 224 | //taggedPkt, err := packetHandlers.PushSingleTag(cTag, pkt) |
| 225 | |
| 226 | msg := bbsim.ByteMsg{ |
| 227 | IntfId: ponPortId, |
| 228 | OnuId: onuId, |
| 229 | Bytes: pkt, |
| 230 | } |
| 231 | |
| 232 | if err := sendDHCPPktIn(msg, stream); err != nil { |
| 233 | return err |
| 234 | } |
| 235 | dhcpLogger.WithFields(log.Fields{ |
| 236 | "OnuId": onuId, |
| 237 | "IntfId": ponPortId, |
| 238 | "OnuSn": serialNumber, |
| 239 | }).Infof("DHCPDiscovery Sent") |
| 240 | return nil |
| 241 | } |
| 242 | |
| 243 | func sendDHCPRequest(ponPortId uint32, onuId uint32, serialNumber string, onuHwAddress net.HardwareAddr, cTag int, stream openolt.Openolt_EnableIndicationServer) error { |
| 244 | dhcp := createDHCPReq(ponPortId, onuId) |
| 245 | pkt, err := serializeDHCPPacket(ponPortId, onuId, onuHwAddress, dhcp) |
| 246 | |
| 247 | if err != nil { |
| 248 | dhcpLogger.Errorf("Cannot serializeDHCPPacket: %s", err) |
| 249 | return err |
| 250 | } |
| 251 | // NOTE I don't think we need to tag the packet |
| 252 | //taggedPkt, err := packetHandlers.PushSingleTag(cTag, pkt) |
| 253 | |
| 254 | msg := bbsim.ByteMsg{ |
| 255 | IntfId: ponPortId, |
| 256 | OnuId: onuId, |
| 257 | Bytes: pkt, |
| 258 | } |
| 259 | |
| 260 | if err := sendDHCPPktIn(msg, stream); err != nil { |
| 261 | return err |
| 262 | } |
| 263 | dhcpLogger.WithFields(log.Fields{ |
| 264 | "OnuId": onuId, |
| 265 | "IntfId": ponPortId, |
| 266 | "OnuSn": serialNumber, |
| 267 | }).Infof("DHCPDiscovery Sent") |
| 268 | return nil |
| 269 | } |
| 270 | |
| 271 | func CreateDHCPClient(onuId uint32, ponPortId uint32, serialNumber string, onuHwAddress net.HardwareAddr, cTag int, onuStateMachine *fsm.FSM, stream openolt.Openolt_EnableIndicationServer, pktOutCh chan *bbsim.ByteMsg) { |
| 272 | // NOTE pckOutCh is channel to listen on for packets received by VOLTHA |
| 273 | // the OLT device will publish messages on that channel |
| 274 | |
| 275 | dhcpLogger.WithFields(log.Fields{ |
| 276 | "OnuId": onuId, |
| 277 | "IntfId": ponPortId, |
| 278 | "OnuSn": serialNumber, |
| 279 | }).Infof("DHCP State Machine starting") |
| 280 | |
| 281 | defer dhcpLogger.WithFields(log.Fields{ |
| 282 | "OnuId": onuId, |
| 283 | "IntfId": ponPortId, |
| 284 | "OnuSn": serialNumber, |
| 285 | }).Infof("DHCP State machine completed") |
| 286 | |
| 287 | // Send DHCP Discovery packet |
| 288 | if err := sendDHCPDiscovery(ponPortId, onuId, serialNumber, onuHwAddress, cTag, stream); err != nil { |
| 289 | dhcpLogger.WithFields(log.Fields{ |
| 290 | "OnuId": onuId, |
| 291 | "IntfId": ponPortId, |
| 292 | "OnuSn": serialNumber, |
| 293 | }).Errorf("Can't send DHCP Discovery: %s", err) |
| 294 | if err := onuStateMachine.Event("dhcp_failed"); err != nil { |
| 295 | dhcpLogger.WithFields(log.Fields{ |
| 296 | "OnuId": onuId, |
| 297 | "IntfId": ponPortId, |
| 298 | "OnuSn": serialNumber, |
| 299 | }).Errorf("Error while transitioning ONU State %v", err) |
| 300 | } |
| 301 | return |
| 302 | } |
| 303 | |
| 304 | if err := onuStateMachine.Event("dhcp_discovery_sent"); err != nil { |
| 305 | dhcpLogger.WithFields(log.Fields{ |
| 306 | "OnuId": onuId, |
| 307 | "IntfId": ponPortId, |
| 308 | "OnuSn": serialNumber, |
| 309 | }).Errorf("Error while transitioning ONU State %v", err) |
| 310 | } |
| 311 | |
| 312 | dhcpLogger.WithFields(log.Fields{ |
| 313 | "OnuId": onuId, |
| 314 | "IntfId": ponPortId, |
| 315 | "OnuSn": serialNumber, |
| 316 | }).Infof("Listening on dhcpPktOutCh") |
| 317 | |
| 318 | for msg := range pktOutCh { |
| 319 | dhcpLogger.Tracef("Received DHCP message %v", msg) |
| 320 | |
| 321 | pkt := gopacket.NewPacket(msg.Bytes, layers.LayerTypeEthernet, gopacket.Default) |
| 322 | dhcpLayer, err := getDhcpLayer(pkt) |
| 323 | if err != nil { |
| 324 | dhcpLogger.WithFields(log.Fields{ |
| 325 | "OnuId": onuId, |
| 326 | "IntfId": ponPortId, |
| 327 | "OnuSn": serialNumber, |
| 328 | }).Errorf("Can't get DHCP Layer from Packet: %v", err) |
| 329 | continue |
| 330 | } |
| 331 | dhcpMessageType, err := getDhcpMessageType(dhcpLayer) |
| 332 | if err != nil { |
| 333 | dhcpLogger.WithFields(log.Fields{ |
| 334 | "OnuId": onuId, |
| 335 | "IntfId": ponPortId, |
| 336 | "OnuSn": serialNumber, |
| 337 | }).Errorf("Can't get DHCP Message Type from DHCP Layer: %v", err) |
| 338 | continue |
| 339 | } |
| 340 | |
| 341 | if dhcpLayer.Operation == layers.DHCPOpReply { |
| 342 | if dhcpMessageType == layers.DHCPMsgTypeOffer { |
| 343 | if err := sendDHCPRequest(ponPortId, onuId, serialNumber, onuHwAddress, cTag, stream); err != nil { |
| 344 | dhcpLogger.WithFields(log.Fields{ |
| 345 | "OnuId": onuId, |
| 346 | "IntfId": ponPortId, |
| 347 | "OnuSn": serialNumber, |
| 348 | }).Errorf("Can't send DHCP Request: %s", err) |
| 349 | if err := onuStateMachine.Event("dhcp_failed"); err != nil { |
| 350 | dhcpLogger.WithFields(log.Fields{ |
| 351 | "OnuId": onuId, |
| 352 | "IntfId": ponPortId, |
| 353 | "OnuSn": serialNumber, |
| 354 | }).Errorf("Error while transitioning ONU State %v", err) |
| 355 | } |
| 356 | return |
| 357 | } |
| 358 | if err := onuStateMachine.Event("dhcp_request_sent"); err != nil { |
| 359 | dhcpLogger.WithFields(log.Fields{ |
| 360 | "OnuId": onuId, |
| 361 | "IntfId": ponPortId, |
| 362 | "OnuSn": serialNumber, |
| 363 | }).Errorf("Error while transitioning ONU State %v", err) |
| 364 | } |
| 365 | |
| 366 | } else if dhcpMessageType == layers.DHCPMsgTypeAck { |
| 367 | // NOTE once the ack is received we don't need to do anything but change the state |
| 368 | if err := onuStateMachine.Event("dhcp_ack_received"); err != nil { |
| 369 | dhcpLogger.WithFields(log.Fields{ |
| 370 | "OnuId": onuId, |
| 371 | "IntfId": ponPortId, |
| 372 | "OnuSn": serialNumber, |
| 373 | }).Errorf("Error while transitioning ONU State %v", err) |
| 374 | } |
| 375 | return |
| 376 | } |
| 377 | // NOTE do we need to care about DHCPMsgTypeRelease?? |
| 378 | } else { |
| 379 | dhcpLogger.WithFields(log.Fields{ |
| 380 | "OnuId": onuId, |
| 381 | "IntfId": ponPortId, |
| 382 | "OnuSn": serialNumber, |
| 383 | }).Warnf("Unsupported DHCP Operation: %s", dhcpLayer.Operation.String()) |
| 384 | continue |
| 385 | } |
| 386 | } |
| 387 | } |