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 devices |
| 18 | |
| 19 | import ( |
| 20 | "bytes" |
Matteo Scandolo | 4a03626 | 2020-08-17 15:56:13 -0700 | [diff] [blame^] | 21 | "encoding/hex" |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 22 | "os/exec" |
| 23 | |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 24 | "github.com/google/gopacket" |
| 25 | "github.com/google/gopacket/pcap" |
| 26 | "github.com/looplab/fsm" |
| 27 | "github.com/opencord/bbsim/internal/bbsim/packetHandlers" |
| 28 | "github.com/opencord/bbsim/internal/bbsim/types" |
| 29 | log "github.com/sirupsen/logrus" |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 30 | ) |
| 31 | |
| 32 | var ( |
| 33 | nniLogger = log.WithFields(log.Fields{"module": "NNI"}) |
Matteo Scandolo | 40e067f | 2019-10-16 16:59:41 -0700 | [diff] [blame] | 34 | dhcpServerIp = "192.168.254.1" |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 35 | ) |
| 36 | |
Matteo Scandolo | 2742870 | 2019-10-11 16:21:16 -0700 | [diff] [blame] | 37 | type Executor interface { |
| 38 | Command(name string, arg ...string) Runnable |
| 39 | } |
| 40 | |
| 41 | type DefaultExecutor struct{} |
| 42 | |
| 43 | func (d DefaultExecutor) Command(name string, arg ...string) Runnable { |
| 44 | return exec.Command(name, arg...) |
| 45 | } |
| 46 | |
| 47 | type Runnable interface { |
| 48 | Run() error |
| 49 | } |
| 50 | |
| 51 | var executor = DefaultExecutor{} |
| 52 | |
Matteo Scandolo | 86e8ce6 | 2019-10-11 12:03:10 -0700 | [diff] [blame] | 53 | type NniPort struct { |
| 54 | // BBSIM Internals |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 55 | ID uint32 |
| 56 | nniVeth string |
| 57 | upstreamVeth string |
Pragya Arya | 996a089 | 2020-03-09 21:47:52 +0530 | [diff] [blame] | 58 | PacketCount uint64 |
Matteo Scandolo | 86e8ce6 | 2019-10-11 12:03:10 -0700 | [diff] [blame] | 59 | |
| 60 | // PON Attributes |
| 61 | OperState *fsm.FSM |
| 62 | Type string |
| 63 | } |
| 64 | |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 65 | func CreateNNI(olt *OltDevice) (NniPort, error) { |
| 66 | nniPort := NniPort{ |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 67 | ID: uint32(0), |
| 68 | nniVeth: "nni", |
| 69 | upstreamVeth: "upstream", |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 70 | OperState: getOperStateFSM(func(e *fsm.Event) { |
| 71 | oltLogger.Debugf("Changing NNI OperState from %s to %s", e.Src, e.Dst) |
| 72 | }), |
| 73 | Type: "nni", |
| 74 | } |
Shrey Baid | 688b424 | 2020-07-10 20:40:10 +0530 | [diff] [blame] | 75 | _ = createNNIPair(executor, olt, &nniPort) |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 76 | return nniPort, nil |
| 77 | } |
| 78 | |
| 79 | // sendNniPacket will send a packet out of the NNI interface. |
| 80 | // We will send upstream only DHCP packets and drop anything else |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 81 | func (n *NniPort) sendNniPacket(packet gopacket.Packet) error { |
Matteo Scandolo | 73c488d | 2019-11-01 14:44:22 -0700 | [diff] [blame] | 82 | isDhcp := packetHandlers.IsDhcpPacket(packet) |
| 83 | isLldp := packetHandlers.IsLldpPacket(packet) |
| 84 | |
Shrey Baid | 688b424 | 2020-07-10 20:40:10 +0530 | [diff] [blame] | 85 | if !isDhcp && !isLldp { |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 86 | nniLogger.WithFields(log.Fields{ |
| 87 | "packet": packet, |
| 88 | }).Trace("Dropping NNI packet as it's not DHCP") |
Matteo Scandolo | 73c488d | 2019-11-01 14:44:22 -0700 | [diff] [blame] | 89 | return nil |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 90 | } |
| 91 | |
Matteo Scandolo | 73c488d | 2019-11-01 14:44:22 -0700 | [diff] [blame] | 92 | if isDhcp { |
| 93 | packet, err := packetHandlers.PopDoubleTag(packet) |
| 94 | if err != nil { |
| 95 | nniLogger.WithFields(log.Fields{ |
| 96 | "packet": packet, |
| 97 | }).Errorf("Can't remove double tags from packet: %v", err) |
| 98 | return err |
| 99 | } |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 100 | |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 101 | handle, err := getVethHandler(n.nniVeth) |
Matteo Scandolo | 73c488d | 2019-11-01 14:44:22 -0700 | [diff] [blame] | 102 | if err != nil { |
| 103 | return err |
| 104 | } |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 105 | |
Matteo Scandolo | 73c488d | 2019-11-01 14:44:22 -0700 | [diff] [blame] | 106 | err = handle.WritePacketData(packet.Data()) |
| 107 | if err != nil { |
| 108 | nniLogger.WithFields(log.Fields{ |
| 109 | "packet": packet, |
| 110 | }).Errorf("Failed to send packet out of the NNI: %s", err) |
| 111 | return err |
| 112 | } |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 113 | |
Matteo Scandolo | 4a03626 | 2020-08-17 15:56:13 -0700 | [diff] [blame^] | 114 | nniLogger.WithFields(log.Fields{ |
| 115 | "packet": hex.EncodeToString(packet.Data()), |
| 116 | }).Trace("Sent packet out of NNI") |
Matteo Scandolo | 73c488d | 2019-11-01 14:44:22 -0700 | [diff] [blame] | 117 | } else if isLldp { |
| 118 | // TODO rework this when BBSim supports data-plane packets |
| 119 | nniLogger.Trace("Received LLDP Packet, ignoring it") |
| 120 | } |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 121 | return nil |
| 122 | } |
| 123 | |
Matteo Scandolo | 2742870 | 2019-10-11 16:21:16 -0700 | [diff] [blame] | 124 | //createNNIBridge will create a veth bridge to fake the connection between the NNI port |
| 125 | //and something upstream, in this case a DHCP server. |
| 126 | //It is also responsible to start the DHCP server itself |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 127 | func createNNIPair(executor Executor, olt *OltDevice, nniPort *NniPort) error { |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 128 | |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 129 | if err := executor.Command("ip", "link", "add", nniPort.nniVeth, "type", "veth", "peer", "name", nniPort.upstreamVeth).Run(); err != nil { |
| 130 | nniLogger.Errorf("Couldn't create veth pair between %s and %s", nniPort.nniVeth, nniPort.upstreamVeth) |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 131 | return err |
| 132 | } |
| 133 | |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 134 | if err := setVethUp(executor, nniPort.nniVeth); err != nil { |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 135 | return err |
| 136 | } |
| 137 | |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 138 | if err := setVethUp(executor, nniPort.upstreamVeth); err != nil { |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 139 | return err |
| 140 | } |
| 141 | |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 142 | // TODO should be moved out of this function in case there are multiple NNI interfaces. |
| 143 | // Only one DHCP server should be running and listening on all NNI interfaces |
| 144 | if err := startDHCPServer(nniPort.upstreamVeth, dhcpServerIp); err != nil { |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 145 | return err |
| 146 | } |
| 147 | |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 148 | return nil |
| 149 | } |
| 150 | |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 151 | // NewVethChan returns a new channel for receiving packets over the NNI interface |
Matteo Scandolo | 401503a | 2019-12-11 14:48:14 -0800 | [diff] [blame] | 152 | func (n *NniPort) NewVethChan() (chan *types.PacketMsg, *pcap.Handle, error) { |
| 153 | ch, handle, err := listenOnVeth(n.nniVeth) |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 154 | if err != nil { |
Matteo Scandolo | 401503a | 2019-12-11 14:48:14 -0800 | [diff] [blame] | 155 | return nil, nil, err |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 156 | } |
Matteo Scandolo | 401503a | 2019-12-11 14:48:14 -0800 | [diff] [blame] | 157 | return ch, handle, err |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 158 | } |
| 159 | |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 160 | // setVethUp is responsible to activate a virtual interface |
Matteo Scandolo | 2742870 | 2019-10-11 16:21:16 -0700 | [diff] [blame] | 161 | func setVethUp(executor Executor, vethName string) error { |
| 162 | if err := executor.Command("ip", "link", "set", vethName, "up").Run(); err != nil { |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 163 | nniLogger.Errorf("Couldn't change interface %s state to up: %v", vethName, err) |
| 164 | return err |
| 165 | } |
| 166 | return nil |
| 167 | } |
| 168 | |
Zdravko Bozakov | 681364d | 2019-11-10 14:28:46 +0100 | [diff] [blame] | 169 | var startDHCPServer = func(upstreamVeth string, dhcpServerIp string) error { |
| 170 | // TODO the DHCP server should support multiple interfaces |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 171 | if err := exec.Command("ip", "addr", "add", dhcpServerIp, "dev", upstreamVeth).Run(); err != nil { |
| 172 | nniLogger.Errorf("Couldn't assing ip %s to interface %s: %v", dhcpServerIp, upstreamVeth, err) |
| 173 | return err |
| 174 | } |
| 175 | |
Matteo Scandolo | 2742870 | 2019-10-11 16:21:16 -0700 | [diff] [blame] | 176 | if err := setVethUp(executor, upstreamVeth); err != nil { |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 177 | return err |
| 178 | } |
| 179 | |
| 180 | dhcp := "/usr/local/bin/dhcpd" |
| 181 | conf := "/etc/dhcp/dhcpd.conf" // copied in the container from configs/dhcpd.conf |
| 182 | logfile := "/tmp/dhcplog" |
| 183 | var stderr bytes.Buffer |
Matteo Scandolo | fe9ac25 | 2019-10-25 11:40:17 -0700 | [diff] [blame] | 184 | cmd := exec.Command(dhcp, "-cf", conf, upstreamVeth, "-tf", logfile, "-4") |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 185 | cmd.Stderr = &stderr |
| 186 | err := cmd.Run() |
| 187 | if err != nil { |
| 188 | nniLogger.Errorf("Fail to start DHCP Server: %s, %s", err, stderr.String()) |
| 189 | return err |
| 190 | } |
| 191 | nniLogger.Info("Successfully activated DHCP Server") |
| 192 | return nil |
| 193 | } |
| 194 | |
| 195 | func getVethHandler(vethName string) (*pcap.Handle, error) { |
| 196 | var ( |
| 197 | device = vethName |
| 198 | snapshotLen int32 = 1518 |
| 199 | promiscuous = false |
| 200 | timeout = pcap.BlockForever |
| 201 | ) |
| 202 | handle, err := pcap.OpenLive(device, snapshotLen, promiscuous, timeout) |
| 203 | if err != nil { |
| 204 | nniLogger.Errorf("Can't retrieve handler for interface %s", vethName) |
| 205 | return nil, err |
| 206 | } |
| 207 | return handle, nil |
| 208 | } |
| 209 | |
Matteo Scandolo | 401503a | 2019-12-11 14:48:14 -0800 | [diff] [blame] | 210 | var listenOnVeth = func(vethName string) (chan *types.PacketMsg, *pcap.Handle, error) { |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 211 | |
| 212 | handle, err := getVethHandler(vethName) |
| 213 | if err != nil { |
Matteo Scandolo | 401503a | 2019-12-11 14:48:14 -0800 | [diff] [blame] | 214 | return nil, nil, err |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 215 | } |
| 216 | |
Matteo Scandolo | e33447a | 2019-10-31 12:38:23 -0700 | [diff] [blame] | 217 | channel := make(chan *types.PacketMsg, 1024) |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 218 | |
| 219 | go func() { |
Matteo Scandolo | 401503a | 2019-12-11 14:48:14 -0800 | [diff] [blame] | 220 | nniLogger.Info("Start listening on NNI for packets") |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 221 | packetSource := gopacket.NewPacketSource(handle, handle.LinkType()) |
| 222 | for packet := range packetSource.Packets() { |
| 223 | |
| 224 | if !packetHandlers.IsIncomingPacket(packet) { |
| 225 | nniLogger.Tracef("Ignoring packet as it's going out") |
| 226 | continue |
| 227 | } |
| 228 | |
| 229 | nniLogger.WithFields(log.Fields{ |
| 230 | "packet": packet.Dump(), |
| 231 | }).Tracef("Received packet on NNI Port") |
| 232 | pkt := types.PacketMsg{ |
| 233 | Pkt: packet, |
| 234 | } |
| 235 | channel <- &pkt |
| 236 | } |
Matteo Scandolo | 401503a | 2019-12-11 14:48:14 -0800 | [diff] [blame] | 237 | nniLogger.Info("Stop listening on NNI for packets") |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 238 | }() |
| 239 | |
Matteo Scandolo | 401503a | 2019-12-11 14:48:14 -0800 | [diff] [blame] | 240 | return channel, handle, nil |
Matteo Scandolo | 4b3fc7e | 2019-09-17 16:49:54 -0700 | [diff] [blame] | 241 | } |