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 | package core |
| 17 | |
| 18 | import ( |
| 19 | "context" |
| 20 | "encoding/binary" |
| 21 | "encoding/hex" |
| 22 | "fmt" |
| 23 | "time" |
| 24 | |
| 25 | "github.com/google/gopacket" |
| 26 | "github.com/google/gopacket/layers" |
| 27 | "github.com/google/gopacket/pcap" |
| 28 | oop "github.com/opencord/voltha-protos/v3/go/openolt" |
| 29 | ) |
| 30 | |
| 31 | const vlanEnable = true |
| 32 | const vlanIdManagement = 4090 |
| 33 | |
| 34 | var svlanTagAuth = []byte{0x88, 0xa8, 0x0f, 0xfb} |
| 35 | |
| 36 | // IfName is a Interface Name of this device |
| 37 | var IfName string |
| 38 | |
| 39 | // SrcMac is a MAC address of this device |
| 40 | var SrcMac string |
| 41 | |
| 42 | var l2oamHandle *L2oamHandle |
| 43 | |
| 44 | // GetL2oamHandle returns my handle |
| 45 | func GetL2oamHandle() *L2oamHandle { |
| 46 | return l2oamHandle |
| 47 | } |
| 48 | |
| 49 | // L2oamHandle contains handle information |
| 50 | type L2oamHandle struct { |
| 51 | Handle *pcap.Handle |
| 52 | ReqCh chan []byte |
| 53 | } |
| 54 | |
| 55 | // NewL2oamHandle L2oamHandle created |
| 56 | func NewL2oamHandle(ctx context.Context, ifname string, srcMac string) { |
| 57 | logger.Debug(ctx, fmt.Sprintf("L2oamHandle start. ifname=%s, srcMac=%s", ifname, srcMac)) |
| 58 | IfName = ifname |
| 59 | SrcMac = srcMac |
| 60 | if GetL2oamHandle() == nil { |
| 61 | handle, _ := pcap.OpenLive(IfName, int32(1500), false, time.Millisecond*1000) |
| 62 | l2oamHandle = &L2oamHandle{ |
| 63 | Handle: handle, |
| 64 | ReqCh: make(chan []byte), |
| 65 | } |
| 66 | if handle == nil { |
| 67 | logger.Debug(ctx, "could not get pcap handle.") |
| 68 | } else { |
| 69 | go l2oamHandle.startThread(context.Background()) |
| 70 | } |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | // because of each handle object that is provided for a device receive messages respectively, |
| 75 | // call this method using goroutine |
| 76 | func (h *L2oamHandle) startThread(ctx context.Context) { |
| 77 | logger.Debug(ctx, "L2oamHandle thread start. ") |
| 78 | |
| 79 | var filter string = "ether proto 0xa8c8 or 0x888e or 0x8100 or 0x88a8" |
| 80 | err := h.Handle.SetBPFFilter(filter) |
| 81 | if err != nil { |
| 82 | logger.Error(ctx, "Error: Handle.SetBPFFilter") |
| 83 | } |
| 84 | |
| 85 | packetSource := gopacket.NewPacketSource(h.Handle, h.Handle.LinkType()) |
| 86 | |
| 87 | for { |
| 88 | select { |
| 89 | // send a message directly using send method, not sending it via channels |
| 90 | case message := <-h.ReqCh: |
| 91 | logger.Debug(ctx, fmt.Sprintf("gopacket send. %x", message)) |
| 92 | if err := h.Handle.WritePacketData(message); err != nil { |
| 93 | logger.Debug(ctx, "write-packet-error") |
| 94 | } |
| 95 | // Packets are received |
| 96 | case packet := <-packetSource.Packets(): |
| 97 | etherLayer := packet.Layer(layers.LayerTypeEthernet) |
| 98 | logger.Debug(ctx, fmt.Sprintf("gopacket receive. %x", etherLayer)) |
| 99 | if etherLayer != nil { |
| 100 | // type assertion |
| 101 | etherPacket, _ := etherLayer.(*layers.Ethernet) |
| 102 | packetBytes := append(etherPacket.Contents, etherPacket.Payload...) |
| 103 | logger.Debug(ctx, fmt.Sprintf("gopacket ether receive. %x", packetBytes)) |
| 104 | if vlanEnable { |
| 105 | h.dispatchVlan(ctx, etherPacket) |
| 106 | } else { |
| 107 | h.dispatch(ctx, etherPacket) |
| 108 | } |
| 109 | } |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | func (h *L2oamHandle) dispatch(ctx context.Context, etherPacket *layers.Ethernet) { |
| 114 | logger.Debug(ctx, fmt.Sprintf("dispatch(). %x", etherPacket)) |
| 115 | |
| 116 | etherType := uint16(etherPacket.EthernetType) |
| 117 | if etherType == uint16(layers.EthernetTypeEAPOL) { |
| 118 | logger.Debug(ctx, fmt.Sprintf("receive message = EAPOL, Contents=%x, Payload=%x", etherPacket.Contents, etherPacket.Payload)) |
| 119 | device := FindL2oamDevice(hex.EncodeToString(etherPacket.SrcMAC)) |
| 120 | if device == nil { |
| 121 | // unregisterd device |
| 122 | logger.Error(ctx, fmt.Sprintf("Received from an unregistered device. macAddr=%s", etherPacket.SrcMAC)) |
| 123 | h.packetIn(etherPacket) |
| 124 | } else { |
| 125 | device.receiveEapol(etherPacket) |
| 126 | } |
| 127 | |
| 128 | } else if etherType == 0xa8c8 { |
| 129 | bytes := etherPacket.Payload |
| 130 | opcode := bytes[0] |
| 131 | oampduCode := bytes[3] |
| 132 | logger.Debug(ctx, fmt.Sprintf("receive message = 1904.2 OAM opcode=%v oampduCode=%v, %x", opcode, oampduCode, bytes)) |
| 133 | |
| 134 | device := FindL2oamDevice(hex.EncodeToString(etherPacket.SrcMAC)) |
| 135 | if device == nil { |
| 136 | // unregisterd device |
| 137 | logger.Error(ctx, fmt.Sprintf("Received from an unregistered device. macAddr=%s", etherPacket.SrcMAC)) |
| 138 | return |
| 139 | } |
| 140 | |
| 141 | // OAM: keep-alive message |
| 142 | if opcode == 0x03 && oampduCode == 0x00 { |
| 143 | device.recieveKeepAlive(etherPacket) |
| 144 | |
| 145 | } else { |
| 146 | device.recieve(etherPacket) |
| 147 | } |
| 148 | } else if etherType == uint16(layers.EthernetTypeDot1Q) { |
| 149 | device := FindL2oamDevice(hex.EncodeToString(etherPacket.SrcMAC)) |
| 150 | if device == nil { |
| 151 | // unregisterd device |
| 152 | logger.Error(ctx, fmt.Sprintf("Received from an unregistered device. macAddr=%s", etherPacket.SrcMAC)) |
| 153 | h.packetIn(etherPacket) |
| 154 | } else { |
| 155 | device.receiveEapol(etherPacket) |
| 156 | } |
| 157 | |
| 158 | } else { |
| 159 | logger.Error(ctx, fmt.Sprintf("unknown etherType = 0x%X", etherType)) |
| 160 | } |
| 161 | } |
| 162 | func (h *L2oamHandle) dispatchVlan(ctx context.Context, etherPacket *layers.Ethernet) { |
| 163 | logger.Debug(ctx, fmt.Sprintf("dispatchVlan(). %x", etherPacket)) |
| 164 | |
| 165 | etherType := uint16(etherPacket.EthernetType) |
| 166 | if etherType == uint16(layers.EthernetTypeQinQ) { |
| 167 | // Remove the VLAN tag |
| 168 | vlanPacket := &layers.Dot1Q{} |
| 169 | if err := vlanPacket.DecodeFromBytes(etherPacket.Payload, nil); err != nil { |
| 170 | logger.Debug(ctx, fmt.Sprintf("error:%v", err)) |
| 171 | } |
| 172 | etherBytes := etherPacket.Contents |
| 173 | binary.BigEndian.PutUint16(etherBytes[12:], uint16(vlanPacket.Type)) |
| 174 | packetBytes := append(etherBytes, vlanPacket.Payload...) |
| 175 | etherPacket = &layers.Ethernet{} |
| 176 | if err := etherPacket.DecodeFromBytes(packetBytes, nil); err != nil { |
| 177 | logger.Debug(ctx, fmt.Sprintf("error:%v", err)) |
| 178 | } |
| 179 | h.dispatch(ctx, etherPacket) |
| 180 | } else { |
| 181 | logger.Error(ctx, fmt.Sprintf("Discard unsupported etherType. 0x%X", etherType)) |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | func (h *L2oamHandle) send(message []byte) { |
| 186 | if h.Handle != nil { |
| 187 | h.ReqCh <- message |
| 188 | } |
| 189 | } |
| 190 | func (h *L2oamHandle) packetIn(etherPacket *layers.Ethernet) { |
| 191 | packetBytes := append(etherPacket.Contents, etherPacket.Payload...) |
| 192 | pktInd := &oop.PacketIndication{ |
| 193 | IntfId: 0, |
| 194 | GemportId: 1, |
| 195 | PortNo: 16, |
| 196 | Pkt: packetBytes, |
| 197 | IntfType: "pon", |
| 198 | } |
| 199 | logger.Info(context.Background(), fmt.Sprintf("L2oamHandle.packetIn() pktInd=%x", pktInd)) |
| 200 | |
| 201 | if err := l2oamDeviceHandler.handlePacketIndication(context.Background(), pktInd); err != nil { |
| 202 | logger.Error(context.Background(), "L2oamHandle.packetIn() error. ") |
| 203 | } |
| 204 | } |