Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2022-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 | * |
| 7 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | * |
| 9 | * Unless required by applicable law or agreed to in writing, software |
| 10 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | * See the License for the specific language governing permissions and |
| 13 | * limitations under the License. |
| 14 | */ |
| 15 | |
| 16 | package application |
| 17 | |
| 18 | import ( |
| 19 | "encoding/hex" |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 20 | "context" |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 21 | "errors" |
| 22 | "net" |
| 23 | "sync" |
| 24 | |
| 25 | "github.com/google/gopacket" |
| 26 | "github.com/google/gopacket/layers" |
| 27 | |
| 28 | cntlr "voltha-go-controller/internal/pkg/controller" |
| 29 | "voltha-go-controller/internal/pkg/of" |
| 30 | "voltha-go-controller/internal/pkg/util" |
Tinoj Joseph | 1d10832 | 2022-07-13 10:07:39 +0530 | [diff] [blame] | 31 | "voltha-go-controller/log" |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 32 | ) |
| 33 | |
| 34 | // DhcpRelayState type |
| 35 | type DhcpRelayState uint8 |
| 36 | |
| 37 | const ( |
| 38 | // DhcpRelayStateNone constant |
| 39 | DhcpRelayStateNone DhcpRelayState = iota |
| 40 | // DhcpRelayStateDiscover constant |
| 41 | DhcpRelayStateDiscover |
| 42 | // DhcpRelayStateOffer constant |
| 43 | DhcpRelayStateOffer |
| 44 | // DhcpRelayStateRequest constant |
| 45 | DhcpRelayStateRequest |
| 46 | // DhcpRelayStateAck constant |
| 47 | DhcpRelayStateAck |
| 48 | // DhcpRelayStateNAK constant |
| 49 | DhcpRelayStateNAK |
| 50 | // DhcpRelayStateRelease constant |
| 51 | DhcpRelayStateRelease |
| 52 | ) |
| 53 | |
| 54 | // RemoteIDType represents data type for various RemoteID types |
| 55 | type RemoteIDType string |
| 56 | |
| 57 | // List of RemoteID types supported |
| 58 | const ( |
| 59 | MACAddress RemoteIDType = "MAC_ADDRESS" |
| 60 | CustomRemotedID RemoteIDType = "Custom" |
| 61 | ) |
| 62 | |
| 63 | // MaxLenDhcpv6DUID constant |
| 64 | const MaxLenDhcpv6DUID = 130 // 2: DUID-Type, 128: MaxLen of DUID value |
| 65 | |
| 66 | // opt82 constant |
| 67 | const opt82 = 82 |
| 68 | |
| 69 | // Dhcpv6RelayState type |
| 70 | type Dhcpv6RelayState uint8 |
| 71 | |
| 72 | const ( |
| 73 | // Dhcpv6RelayStateNone constant |
| 74 | Dhcpv6RelayStateNone Dhcpv6RelayState = iota |
| 75 | // Dhcpv6RelayStateSolicit constant |
| 76 | Dhcpv6RelayStateSolicit |
| 77 | // Dhcpv6RelayStateReply constant |
| 78 | Dhcpv6RelayStateReply |
| 79 | // Dhcpv6RelayStateRelease constant |
| 80 | Dhcpv6RelayStateRelease |
| 81 | ) |
| 82 | |
| 83 | var ( |
| 84 | // ErrSessionDoNotExist error type |
| 85 | ErrSessionDoNotExist = errors.New("Session Doesn't Exist") |
| 86 | ) |
| 87 | |
| 88 | // IDhcpRelaySession to get dhcp session field value |
| 89 | type IDhcpRelaySession interface { |
| 90 | GetCircuitID() []byte |
| 91 | GetRemoteID() []byte |
| 92 | GetNniVlans() (uint16, uint16) |
| 93 | GetDhcpState() DhcpRelayState |
| 94 | GetDhcpv6State() Dhcpv6RelayState |
| 95 | SetDhcpState(DhcpRelayState) |
| 96 | SetDhcpv6State(Dhcpv6RelayState) |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 97 | SetMacAddr(context.Context, net.HardwareAddr) |
| 98 | DhcpResultInd(context.Context, *layers.DHCPv4) |
| 99 | Dhcpv6ResultInd(cntx context.Context, ipv6Addr net.IP, leaseTime uint32) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | // DhcpRelayVnet : The DHCP relay sessions are stored in a map to be retrieved from when |
| 103 | // a response is received from the network. The map uses the VLANs and the |
| 104 | // the MAC address as key to finding the service |
| 105 | // DHCP Relay Virtual Network hosts a set of DHCP relay sessions that belong |
| 106 | // to the network. It supports two VLANs as its identify. If a single VLAN or |
| 107 | // no VLAN is to be used, those two should be passed as 4096 (VlanNone) |
| 108 | type DhcpRelayVnet struct { |
| 109 | OuterVlan uint16 |
| 110 | InnerVlan uint16 |
| 111 | sessions map[[6]byte]IDhcpRelaySession |
| 112 | sessionsv6 map[[MaxLenDhcpv6DUID]byte]IDhcpRelaySession |
| 113 | sessionLock sync.RWMutex |
| 114 | } |
| 115 | |
| 116 | // DhcpNetworks hosts different DHCP networks that in turn hold the DHCP |
| 117 | // sessions |
| 118 | type DhcpNetworks struct { |
| 119 | Networks map[uint32]*DhcpRelayVnet |
| 120 | } |
| 121 | |
| 122 | func init() { |
| 123 | RegisterPacketHandler(DHCPv4, ProcessUDP4Packet) |
| 124 | RegisterPacketHandler(DHCPv6, ProcessUDP6Packet) |
| 125 | } |
| 126 | |
| 127 | // NewDhcpRelayVnet is constructor for a DHCP Relay Virtual network |
| 128 | func NewDhcpRelayVnet(outerVlan uint16, innerVlan uint16) *DhcpRelayVnet { |
| 129 | var drv DhcpRelayVnet |
| 130 | |
| 131 | drv.OuterVlan = outerVlan |
| 132 | drv.InnerVlan = innerVlan |
| 133 | drv.sessions = make(map[[6]byte]IDhcpRelaySession) |
| 134 | drv.sessionsv6 = make(map[[MaxLenDhcpv6DUID]byte]IDhcpRelaySession) |
| 135 | return &drv |
| 136 | } |
| 137 | |
| 138 | // GetDhcpVnet to add dhcp vnet |
| 139 | func (dn *DhcpNetworks) GetDhcpVnet(outerVlan uint16, innerVlan uint16) *DhcpRelayVnet { |
| 140 | comboVlan := uint32(outerVlan)<<16 + uint32(innerVlan) |
| 141 | drv, ok := dn.Networks[comboVlan] |
| 142 | if ok { |
| 143 | return drv |
| 144 | } |
| 145 | return nil |
| 146 | } |
| 147 | |
| 148 | // AddDhcpVnet to add dhcp vnet |
| 149 | func (dn *DhcpNetworks) AddDhcpVnet(outerVlan uint16, innerVlan uint16) *DhcpRelayVnet { |
| 150 | comboVlan := uint32(outerVlan)<<16 + uint32(innerVlan) |
| 151 | if drv, ok := dn.Networks[comboVlan]; ok { |
| 152 | return drv |
| 153 | } |
| 154 | drv := NewDhcpRelayVnet(outerVlan, innerVlan) |
| 155 | dn.Networks[comboVlan] = drv |
| 156 | return drv |
| 157 | } |
| 158 | |
| 159 | // NewDhcpNetworks to get new dhcp network |
| 160 | func NewDhcpNetworks() *DhcpNetworks { |
| 161 | var dn DhcpNetworks |
| 162 | dn.Networks = make(map[uint32]*DhcpRelayVnet) |
| 163 | return &dn |
| 164 | } |
| 165 | |
| 166 | // AddDhcpSession to add dhcp session |
| 167 | func (dn *DhcpNetworks) AddDhcpSession(pkt gopacket.Packet, session IDhcpRelaySession) error { |
| 168 | var key [6]byte |
| 169 | ethl := pkt.Layer(layers.LayerTypeEthernet) |
| 170 | eth, _ := ethl.(*layers.Ethernet) |
| 171 | addr := eth.SrcMAC |
| 172 | if len(addr) != 6 { |
| 173 | logger.Errorw(ctx, "Invalid MAC address", log.Fields{"Addr": addr}) |
| 174 | return errors.New("Invalid MAC address") |
| 175 | } |
| 176 | copy(key[:], addr[0:6]) |
| 177 | |
| 178 | drv := dn.AddDhcpVnet(session.GetNniVlans()) |
| 179 | |
| 180 | drv.sessionLock.Lock() |
| 181 | drv.sessions[key] = session |
| 182 | drv.sessionLock.Unlock() |
| 183 | return nil |
| 184 | } |
| 185 | |
| 186 | // DelDhcpSession to delete dhcp session |
| 187 | func (dn *DhcpNetworks) DelDhcpSession(pkt gopacket.Packet, session IDhcpRelaySession) { |
| 188 | var key [6]byte |
| 189 | ethl := pkt.Layer(layers.LayerTypeEthernet) |
| 190 | eth, _ := ethl.(*layers.Ethernet) |
| 191 | addr := eth.SrcMAC |
| 192 | if len(addr) != 6 { |
| 193 | logger.Errorw(ctx, "Invalid MAC address", log.Fields{"Addr": addr}) |
| 194 | return |
| 195 | } |
| 196 | copy(key[:], addr[0:6]) |
| 197 | drv := dn.AddDhcpVnet(session.GetNniVlans()) |
| 198 | drv.sessionLock.Lock() |
| 199 | delete(drv.sessions, key) |
| 200 | drv.sessionLock.Unlock() |
| 201 | } |
| 202 | |
| 203 | // delDhcpSessions to delete dhcp sessions |
| 204 | func delDhcpSessions(addr net.HardwareAddr, outervlan of.VlanType, innervlan of.VlanType, sessionKey [MaxLenDhcpv6DUID]byte) { |
| 205 | var key [6]byte |
| 206 | if addr == nil || !NonZeroMacAddress(addr) { |
| 207 | logger.Warnw(ctx, "Invalid MAC address", log.Fields{"Addr": addr}) |
| 208 | return |
| 209 | } |
| 210 | copy(key[:], addr[0:6]) |
| 211 | drv := dhcpNws.AddDhcpVnet(uint16(outervlan), uint16(innervlan)) |
| 212 | drv.sessionLock.Lock() |
| 213 | delete(drv.sessions, key) |
| 214 | delete(drv.sessionsv6, sessionKey) |
| 215 | drv.sessionLock.Unlock() |
| 216 | logger.Infow(ctx, "DHCP Sessions deleted", log.Fields{"MAC": addr}) |
| 217 | } |
| 218 | |
| 219 | // AddDhcp6Session to add dhcpv6 session |
| 220 | func (dn *DhcpNetworks) AddDhcp6Session(key [MaxLenDhcpv6DUID]byte, session IDhcpRelaySession) error { |
| 221 | outerVlan, innerVlan := session.GetNniVlans() |
| 222 | logger.Infow(ctx, "Adding Session", log.Fields{"outerVlan": outerVlan, "innerVlan": innerVlan, "Addr": key}) |
| 223 | drv := dn.AddDhcpVnet(outerVlan, innerVlan) |
| 224 | drv.sessionLock.Lock() |
| 225 | drv.sessionsv6[key] = session |
| 226 | drv.sessionLock.Unlock() |
| 227 | return nil |
| 228 | } |
| 229 | |
| 230 | // DelDhcp6Session to delete dhcpv6 session |
| 231 | func (dn *DhcpNetworks) DelDhcp6Session(key [MaxLenDhcpv6DUID]byte, session IDhcpRelaySession) { |
| 232 | outerVlan, innerVlan := session.GetNniVlans() |
| 233 | logger.Infow(ctx, "Get Session", log.Fields{"OuterVLAN": outerVlan, "InnerVLAN": innerVlan, "Addr": key}) |
| 234 | drv := dn.GetDhcpVnet(outerVlan, innerVlan) |
| 235 | drv.sessionLock.Lock() |
| 236 | delete(drv.sessionsv6, key) |
| 237 | drv.sessionLock.Unlock() |
| 238 | } |
| 239 | |
| 240 | // GetDhcpSession to get dhcp session info |
| 241 | func (dn *DhcpNetworks) GetDhcpSession(outerVlan uint16, innerVlan uint16, addr net.HardwareAddr) (IDhcpRelaySession, error) { |
| 242 | var key [6]byte |
| 243 | if len(addr) != 6 { |
| 244 | logger.Errorw(ctx, "Invalid MAC address", log.Fields{"Addr": addr}) |
| 245 | return nil, errors.New("Invalid MAC address") |
| 246 | } |
| 247 | copy(key[:], addr[0:6]) |
| 248 | drv := dn.AddDhcpVnet(outerVlan, innerVlan) |
| 249 | drv.sessionLock.RLock() |
| 250 | defer drv.sessionLock.RUnlock() |
| 251 | if session, ok := drv.sessions[key]; ok { |
| 252 | return session, nil |
| 253 | } |
| 254 | return nil, ErrSessionDoNotExist |
| 255 | } |
| 256 | |
| 257 | // GetDhcp6Session to get Dhcp6Session |
| 258 | func (dn *DhcpNetworks) GetDhcp6Session(outerVlan uint16, innerVlan uint16, key [MaxLenDhcpv6DUID]byte) (IDhcpRelaySession, error) { |
| 259 | logger.Infow(ctx, "Locating Session", log.Fields{"OuterVlan": outerVlan, "InnerVlan": innerVlan, "key": key}) |
| 260 | |
| 261 | drv := dn.AddDhcpVnet(outerVlan, innerVlan) |
| 262 | drv.sessionLock.RLock() |
| 263 | defer drv.sessionLock.RUnlock() |
| 264 | if session, ok := drv.sessionsv6[key]; ok { |
| 265 | return session, nil |
| 266 | } |
| 267 | return nil, ErrSessionDoNotExist |
| 268 | } |
| 269 | |
| 270 | // GetVlansFromPacket to get vlans from the packet |
| 271 | func GetVlansFromPacket(pkt gopacket.Packet) (innerVlan of.VlanType, outerVlan of.VlanType) { |
| 272 | |
| 273 | vlans := GetVlans(pkt) |
| 274 | if len(vlans) == 1 { |
| 275 | outerVlan = vlans[0] |
| 276 | innerVlan = of.VlanNone |
| 277 | } else if len(vlans) == 0 { |
| 278 | innerVlan = of.VlanNone |
| 279 | outerVlan = of.VlanNone |
| 280 | } else { |
| 281 | innerVlan = vlans[1] |
| 282 | outerVlan = vlans[0] |
| 283 | } |
| 284 | return |
| 285 | } |
| 286 | |
| 287 | // GetVnetForV4Nni to get vnet for v4 Nni |
| 288 | func GetVnetForV4Nni(dhcp *layers.DHCPv4, cvlan of.VlanType, svlan of.VlanType, pbit uint8) ([]*VoltPortVnet, error) { |
| 289 | var err error |
| 290 | var session IDhcpRelaySession |
| 291 | var vpvList []*VoltPortVnet |
| 292 | logger.Infow(ctx, "Mac Obtained MAC: ", log.Fields{"Addr": dhcp.ClientHWAddr}) |
| 293 | session, err = dhcpNws.GetDhcpSession(uint16(svlan), uint16(cvlan), dhcp.ClientHWAddr) |
| 294 | |
| 295 | if session != nil { |
| 296 | vpv, ok := session.(*VoltPortVnet) |
| 297 | logger.Infow(ctx, "Session Exist: VPV found", log.Fields{"VPV": vpv}) |
| 298 | if ok { |
| 299 | vpvList = append(vpvList, vpv) |
| 300 | return vpvList, nil |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | if err == ErrSessionDoNotExist { |
| 305 | //No DHCP Session found, find matching VPV to send the packet out |
| 306 | logger.Info(ctx, "Session Doesnt Exist: Finding matching VPV") |
| 307 | return GetApplication().GetVpvsForDsPkt(cvlan, svlan, dhcp.ClientHWAddr, pbit) |
| 308 | } |
| 309 | return nil, errors.New("The session retrieved of wrong type") |
| 310 | } |
| 311 | |
| 312 | // GetVnetForV6Nni to get vnet for v6 Nni |
| 313 | func GetVnetForV6Nni(dhcp *layers.DHCPv6, cvlan of.VlanType, svlan of.VlanType, |
| 314 | pbit uint8, clientMAC net.HardwareAddr) ([]*VoltPortVnet, net.HardwareAddr, error) { |
| 315 | var err error |
| 316 | var session IDhcpRelaySession |
| 317 | var vpvList []*VoltPortVnet |
| 318 | |
| 319 | var sessionKey [MaxLenDhcpv6DUID]byte |
| 320 | |
| 321 | clientDuid, decodedDuid := getDhcpv6ClientDUID(dhcp) |
| 322 | if clientDuid == nil || decodedDuid == nil { |
| 323 | copy(sessionKey[:], clientMAC) |
| 324 | } else { |
| 325 | copy(sessionKey[:], clientDuid[0:]) |
| 326 | if decodedDuid.Type == layers.DHCPv6DUIDTypeLLT || decodedDuid.Type == layers.DHCPv6DUIDTypeLL { |
| 327 | clientMAC = decodedDuid.LinkLayerAddress |
| 328 | } |
| 329 | } |
| 330 | session, err = dhcpNws.GetDhcp6Session(uint16(svlan), uint16(cvlan), sessionKey) |
| 331 | if session != nil { |
| 332 | vpv, ok := session.(*VoltPortVnet) |
| 333 | logger.Infow(ctx, "Session Exist: VPV found", log.Fields{"VPV": vpv}) |
| 334 | if ok { |
| 335 | vpvList = append(vpvList, vpv) |
| 336 | return vpvList, clientMAC, nil |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | if err == ErrSessionDoNotExist { |
| 341 | //No DHCP Session found, find matching VPV to send the packet out |
| 342 | logger.Info(ctx, "Session Doesnt Exist: Finding matching VPV") |
| 343 | vpvList, err := GetApplication().GetVpvsForDsPkt(cvlan, svlan, clientMAC, pbit) |
| 344 | return vpvList, clientMAC, err |
| 345 | } |
| 346 | return nil, clientMAC, errors.New("The session retrieved of wrong type") |
| 347 | } |
| 348 | |
| 349 | /* |
| 350 | // getDhcpv4ClientMacAddr to get mac address for dhcpv4 client |
| 351 | func getDhcpv4ClientMacAddr(pkt gopacket.Packet) net.HardwareAddr { |
| 352 | dhcp := pkt.Layer(layers.LayerTypeDHCPv4).(*layers.DHCPv4) |
| 353 | logger.Infow(ctx, "Mac Obtained v4: ", log.Fields{"Addr": dhcp.ClientHWAddr}) |
| 354 | return dhcp.ClientHWAddr |
| 355 | } |
| 356 | |
| 357 | // getDhcpv6ClientMacAddr to get mac address for dhcpv6 client |
| 358 | func getDhcpv6ClientMacAddr(dhcpv6 *layers.DHCPv6) net.HardwareAddr { |
| 359 | var cID layers.DHCPv6Option |
| 360 | for _, option := range dhcpv6.Options { |
| 361 | if option.Code == layers.DHCPv6OptClientID { |
| 362 | cID = option |
| 363 | } |
| 364 | } |
| 365 | duid := &layers.DHCPv6DUID{} |
| 366 | |
| 367 | //If cID is not found, DecodeFromBytes() returns error on empty cID |
| 368 | if err := duid.DecodeFromBytes(cID.Data); err == nil { |
| 369 | logger.Infow(ctx, "Mac Obtained v6: ", log.Fields{"Addr": duid.LinkLayerAddress, "Option": cID.String()}) |
| 370 | return duid.LinkLayerAddress |
| 371 | } |
| 372 | return nil |
| 373 | }*/ |
| 374 | |
| 375 | // getDhcpv6ClientDUID to get Dhcpv6 client DUID |
| 376 | func getDhcpv6ClientDUID(dhcpv6 *layers.DHCPv6) ([]byte, *layers.DHCPv6DUID) { |
| 377 | |
| 378 | for _, option := range dhcpv6.Options { |
| 379 | logger.Debugw(ctx, "DHCPv6 Options", log.Fields{"option": option.Code}) |
| 380 | if option.Code == layers.DHCPv6OptClientID { |
| 381 | duid := &layers.DHCPv6DUID{} |
| 382 | err := duid.DecodeFromBytes(option.Data) |
| 383 | if err == nil { |
| 384 | logger.Infow(ctx, "ClientIdentifier", log.Fields{"DUID": duid, "Option": option.String()}) |
| 385 | duidLen := len(option.Data) |
| 386 | if duidLen > 130 { |
| 387 | duidLen = 130 |
| 388 | } |
| 389 | return option.Data[0:duidLen], duid |
| 390 | } |
| 391 | logger.Errorw(ctx, "Client DUID decode failed", log.Fields{"error": err}) |
| 392 | break |
| 393 | } |
| 394 | } |
| 395 | logger.Error(ctx, "Client DUID is not present in the packet") |
| 396 | return nil, nil |
| 397 | } |
| 398 | |
| 399 | // AddDhcpv4Option82 : DHCPv4 packet operations |
| 400 | // Addition of DHCP Option 82 which codes circuit-id and remote-id |
| 401 | // into the packet. This happens as the request is relayed to the |
| 402 | // DHCP servers on the NNI |
| 403 | func AddDhcpv4Option82(svc *VoltService, rID []byte, dhcpv4 *layers.DHCPv4) { |
| 404 | //NOTE : both cID and rID should not be empty if this function is called |
| 405 | cID := svc.GetCircuitID() |
| 406 | var data []byte |
| 407 | if len(cID) != 0 { |
| 408 | data = append(data, 0x01) |
| 409 | data = append(data, byte(len(cID))) |
| 410 | data = append(data, cID...) |
| 411 | } |
| 412 | if len(rID) != 0 { |
| 413 | data = append(data, 0x02) |
| 414 | data = append(data, byte(len(rID))) |
| 415 | data = append(data, rID...) |
| 416 | } |
| 417 | |
| 418 | if svc.isDataRateAttrPresent() { |
| 419 | minDrUs := util.Uint32ToByte(svc.MinDataRateUs) |
| 420 | data = append(data, TYPEMINDATAUS) |
| 421 | data = append(data, byte(len(minDrUs))) |
| 422 | data = append(data, minDrUs...) |
| 423 | |
| 424 | minDrDs := util.Uint32ToByte(svc.MinDataRateDs) |
| 425 | data = append(data, TYPEMINDATADS) |
| 426 | data = append(data, byte(len(minDrDs))) |
| 427 | data = append(data, minDrDs...) |
| 428 | |
| 429 | maxDrUs := util.Uint32ToByte(svc.MaxDataRateUs) |
| 430 | data = append(data, TYPEMAXDATAUS) |
| 431 | data = append(data, byte(len(maxDrUs))) |
| 432 | data = append(data, maxDrUs...) |
| 433 | |
| 434 | maxDrDs := util.Uint32ToByte(svc.MaxDataRateDs) |
| 435 | data = append(data, TYPEMAXDATADS) |
| 436 | data = append(data, byte(len(maxDrDs))) |
| 437 | data = append(data, maxDrDs...) |
| 438 | } |
| 439 | |
| 440 | option := layers.NewDHCPOption(82, data) |
| 441 | dhcpv4.Options = append(dhcpv4.Options, option) |
| 442 | } |
| 443 | |
| 444 | // DelOption82 : Deletion of option 82 from the packet received on the NNI interface. |
| 445 | // Once the packet is received, the option 82 is stripped off and the |
| 446 | // packet is forwarded towards access |
| 447 | func DelOption82(dhcpv4 *layers.DHCPv4) { |
| 448 | for index, option := range dhcpv4.Options { |
| 449 | if option.Type == opt82 { |
| 450 | dhcpv4.Options = append(dhcpv4.Options[0:index], dhcpv4.Options[index+1:]...) |
| 451 | return |
| 452 | } |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | // DhcpMsgType returns the DHCP message type from the packet |
| 457 | func DhcpMsgType(dhcp *layers.DHCPv4) layers.DHCPMsgType { |
| 458 | for _, option := range dhcp.Options { |
| 459 | if option.Type == layers.DHCPOptMessageType { |
| 460 | return layers.DHCPMsgType(option.Data[0]) |
| 461 | } |
| 462 | } |
| 463 | return layers.DHCPMsgTypeUnspecified |
| 464 | } |
| 465 | |
| 466 | // GetIpv4Addr returns the IP address in the DHCP reply |
| 467 | func GetIpv4Addr(dhcp *layers.DHCPv4) (net.IP, int64) { |
| 468 | var leaseTime uint32 |
| 469 | for _, opt := range dhcp.Options { |
| 470 | if opt.Type == layers.DHCPOptLeaseTime { |
| 471 | leaseTime = GetIPv4LeaseTime(opt) |
| 472 | } |
| 473 | } |
| 474 | return dhcp.YourClientIP, int64(leaseTime) |
| 475 | } |
| 476 | |
| 477 | //GetIPv4LeaseTime get ip lease time |
| 478 | func GetIPv4LeaseTime(opt layers.DHCPOption) uint32 { |
| 479 | return uint32(opt.Data[0])<<24 | uint32(opt.Data[1])<<16 | uint32(opt.Data[2])<<8 | uint32(opt.Data[3]) |
| 480 | } |
| 481 | |
| 482 | // GetIpv6Addr returns the IPv6 address in the DHCPv6 reply |
| 483 | func GetIpv6Addr(dhcp6 *layers.DHCPv6) (net.IP, uint32) { |
| 484 | var ipv6Addr net.IP |
| 485 | var leaseTime uint32 |
| 486 | |
| 487 | //Check for IANA allocation, if not present, then look for IAPD allocation |
| 488 | if dhcp6.MsgType == layers.DHCPv6MsgTypeReply { |
| 489 | ipv6Addr, leaseTime = GetIANAAddress(dhcp6) |
| 490 | if ipv6Addr == nil { |
| 491 | ipv6Addr, leaseTime = GetIAPDAddress(dhcp6) |
| 492 | } |
| 493 | } |
| 494 | return ipv6Addr, leaseTime |
| 495 | } |
| 496 | |
| 497 | // GetIANAAddress returns the IPv6 address in the DHCPv6 reply |
| 498 | func GetIANAAddress(dhcp6 *layers.DHCPv6) (net.IP, uint32) { |
| 499 | var ipv6Addr net.IP |
| 500 | var leaseTime uint32 |
| 501 | if dhcp6.MsgType == layers.DHCPv6MsgTypeReply { |
| 502 | for _, o := range dhcp6.Options { |
| 503 | if o.Code == layers.DHCPv6OptIANA { |
| 504 | |
| 505 | iana := &layers.DHCPv6IANA{} |
| 506 | err := iana.DecodeFromBytes(o.Data) |
| 507 | if err == nil { |
| 508 | ipv6Addr = iana.IA.IPv6Addr |
| 509 | leaseTime = iana.IA.ValidLifeTime |
| 510 | logger.Debugw(ctx, "IPv6 Allocated", log.Fields{"IANA IPv6": ipv6Addr}) |
| 511 | return ipv6Addr, leaseTime |
| 512 | } |
Tinoj Joseph | 1d10832 | 2022-07-13 10:07:39 +0530 | [diff] [blame] | 513 | logger.Warnw(ctx, "Decode of IANA Failed", log.Fields{"Reason": err.Error()}) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 514 | break |
| 515 | } |
| 516 | } |
| 517 | } |
| 518 | return nil, 0 |
| 519 | } |
| 520 | |
| 521 | // GetIAPDAddress returns the IPv6 address in the DHCPv6 reply |
| 522 | func GetIAPDAddress(dhcp6 *layers.DHCPv6) (net.IP, uint32) { |
| 523 | var ipv6Addr net.IP |
| 524 | var leaseTime uint32 |
| 525 | if dhcp6.MsgType == layers.DHCPv6MsgTypeReply { |
| 526 | for _, o := range dhcp6.Options { |
| 527 | if o.Code == layers.DHCPv6OptIAPD { |
| 528 | |
| 529 | iapd := &layers.DHCPv6IAPD{} |
| 530 | if err := iapd.DecodeFromBytes(o.Data); err == nil { |
| 531 | ipv6Addr = iapd.PD.Prefix |
| 532 | leaseTime = iapd.PD.ValidLifeTime |
| 533 | logger.Debugw(ctx, "IPv6 Allocated", log.Fields{"IAPD IPv6": ipv6Addr}) |
| 534 | break |
| 535 | } else { |
Tinoj Joseph | 1d10832 | 2022-07-13 10:07:39 +0530 | [diff] [blame] | 536 | logger.Warnw(ctx, "Decode of IAPD Failed", log.Fields{"Reason": err.Error()}) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 537 | break |
| 538 | } |
| 539 | } |
| 540 | } |
| 541 | } |
| 542 | return ipv6Addr, leaseTime |
| 543 | } |
| 544 | |
| 545 | // ProcessDsDhcpv4Packet : DHCPv4 packet processor functions |
| 546 | // This function processes DS DHCP packet received on the NNI port. |
| 547 | // The services are attached to the access ports. Thus, the DHCP |
| 548 | // session is derived from the list of DHCP sessions stored in the |
| 549 | // common map. The key for retrieval includes the VLAN tags in the |
| 550 | // the packet and the MAC address of the client. |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 551 | func (va *VoltApplication) ProcessDsDhcpv4Packet(cntx context.Context, device string, port string, pkt gopacket.Packet) { |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 552 | |
| 553 | // Retrieve the layers to build the outgoing packet. It is not |
| 554 | // possible to add/remove layers to the existing packet and thus |
| 555 | // the lyayers are extracted to build the outgoing packet |
| 556 | eth := pkt.Layer(layers.LayerTypeEthernet).(*layers.Ethernet) |
| 557 | ip := pkt.Layer(layers.LayerTypeIPv4).(*layers.IPv4) |
| 558 | udp := pkt.Layer(layers.LayerTypeUDP).(*layers.UDP) |
| 559 | dhcp4 := pkt.Layer(layers.LayerTypeDHCPv4).(*layers.DHCPv4) |
| 560 | msgType := DhcpMsgType(dhcp4) |
| 561 | |
| 562 | // Need to locate the service from the packet alone as the services |
| 563 | // are not attached to NNI port. The service is stored on DHCP relay |
| 564 | // application |
| 565 | logger.Infow(ctx, "Processing Southbound DS DHCPv4 packet", log.Fields{"Port": port, "Type": msgType}) |
| 566 | |
| 567 | // Retrieve the priority and drop eligible flags from the |
| 568 | // packet received |
| 569 | var priority uint8 |
| 570 | var dsPbit uint8 |
| 571 | var dropEligible bool |
| 572 | dot1ql := pkt.Layer(layers.LayerTypeDot1Q) |
| 573 | if dot1ql != nil { |
| 574 | dot1q := dot1ql.(*layers.Dot1Q) |
| 575 | priority = dot1q.Priority |
| 576 | dropEligible = dot1q.DropEligible |
| 577 | } |
| 578 | |
| 579 | pktInnerlan, pktOuterlan := GetVlansFromPacket(pkt) |
| 580 | vpvList, _ := GetVnetForV4Nni(dhcp4, pktInnerlan, pktOuterlan, priority) |
| 581 | if len(vpvList) == 0 { |
| 582 | logger.Warn(ctx, "VNET couldn't be found for NNI") |
| 583 | return |
| 584 | } |
| 585 | |
| 586 | // The DHCP option 82, if it exists is removed from the packet |
| 587 | DelOption82(dhcp4) |
| 588 | ipAddr, leaseTime := GetIpv4Addr(dhcp4) |
| 589 | |
| 590 | for _, vpv := range vpvList { |
| 591 | dsPbit = vpv.GetRemarkedPriority(priority) |
| 592 | // Raise DHCP ACK/NCK indication |
| 593 | if vpv.DhcpRelay { |
| 594 | // Inform dhcp response information to dhcp server handler |
| 595 | dhcpResponseReceived(uint16(vpv.CVlan), uint16(vpv.SVlan)) |
| 596 | // Process the Ack/Nack to track to state of the IP layer of the connection |
| 597 | if msgType == layers.DHCPMsgTypeAck || msgType == layers.DHCPMsgTypeNak { |
| 598 | // Install DS HSIA flows after DHCP ACK. |
| 599 | if msgType == layers.DHCPMsgTypeAck { |
| 600 | // Voltha will push US and DS HSIA flow on receivng the DS HSIA |
| 601 | // flow installation request, VGC to update US HSIA flow with leanrt MAC. |
| 602 | // separate go rotuine is spawned to avoid drop of ACK packet |
| 603 | // as HSIA flows will be deleted if new MAC is learnt. |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 604 | go vpv.SetMacAddr(cntx, dhcp4.ClientHWAddr) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 605 | } |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 606 | vpv.DhcpResultInd(cntx, dhcp4) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 607 | |
| 608 | } |
| 609 | raiseDHCPv4Indication(msgType, vpv, dhcp4.ClientHWAddr, ipAddr, dsPbit, device, leaseTime) |
| 610 | } |
| 611 | |
| 612 | // Create the outgoing bufer and set the checksum in the packet |
| 613 | buff := gopacket.NewSerializeBuffer() |
| 614 | if err := udp.SetNetworkLayerForChecksum(ip); err != nil { |
| 615 | logger.Error(ctx, "Error in setting checksum") |
| 616 | return |
| 617 | } |
| 618 | opts := gopacket.SerializeOptions{ |
| 619 | FixLengths: true, |
| 620 | ComputeChecksums: true, |
| 621 | } |
| 622 | |
| 623 | cTagType := layers.EthernetTypeIPv4 |
| 624 | eth.EthernetType = layers.EthernetTypeDot1Q |
| 625 | |
| 626 | var pktLayers []gopacket.SerializableLayer |
| 627 | pktLayers = append(pktLayers, eth) |
| 628 | |
| 629 | var qVlans []of.VlanType |
| 630 | var qVlanLayers []gopacket.SerializableLayer |
| 631 | |
| 632 | if vpv.AllowTransparent { |
| 633 | vlanThreshold := 2 |
| 634 | // In case of ONU_CVLAN or OLT_SVLAN, the DS pkts have single configured vlan |
| 635 | // In case of ONU_CVLAN_OLT_SVLAN or OLT_CVLAN_OLT_SVLAN, the DS pkts have 2 configured vlan |
| 636 | // Based on that, the no. of vlans should be ignored to get only transparent vlans |
| 637 | if vpv.VlanControl == ONUCVlan || vpv.VlanControl == OLTSVlan || vpv.VlanControl == None { |
| 638 | vlanThreshold = 1 |
| 639 | } |
| 640 | nxtLayer := layers.EthernetTypeDot1Q |
| 641 | if vlans := GetVlans(pkt); len(vlans) > vlanThreshold { |
| 642 | qVlans = vlans[vlanThreshold:] |
| 643 | cTagType = layers.EthernetTypeDot1Q |
| 644 | } |
| 645 | for i, qVlan := range qVlans { |
| 646 | vlan := uint16(qVlan) |
| 647 | if i == (len(qVlans) - 1) { |
| 648 | nxtLayer = layers.EthernetTypeIPv4 |
| 649 | } |
| 650 | qdot1q := &layers.Dot1Q{Priority: priority, VLANIdentifier: vlan, DropEligible: dropEligible, Type: nxtLayer} |
| 651 | qVlanLayers = append(qVlanLayers, qdot1q) |
| 652 | } |
| 653 | } |
| 654 | switch vpv.VlanControl { |
| 655 | case ONUCVlanOLTSVlan: |
| 656 | cdot1q := &layers.Dot1Q{Priority: dsPbit, VLANIdentifier: uint16(vpv.CVlan), DropEligible: dropEligible, Type: cTagType} |
| 657 | pktLayers = append(pktLayers, cdot1q) |
| 658 | case ONUCVlan, |
| 659 | None: |
| 660 | sdot1q := &layers.Dot1Q{Priority: dsPbit, VLANIdentifier: uint16(vpv.SVlan), DropEligible: dropEligible, Type: cTagType} |
| 661 | pktLayers = append(pktLayers, sdot1q) |
| 662 | case OLTCVlanOLTSVlan, |
| 663 | OLTSVlan: |
| 664 | udot1q := &layers.Dot1Q{Priority: dsPbit, VLANIdentifier: uint16(vpv.UniVlan), DropEligible: dropEligible, Type: cTagType} |
| 665 | pktLayers = append(pktLayers, udot1q) |
| 666 | default: |
| 667 | logger.Errorw(ctx, "Invalid Vlan Control Option", log.Fields{"Value": vpv.VlanControl}) |
| 668 | } |
| 669 | |
| 670 | pktLayers = append(pktLayers, qVlanLayers...) |
| 671 | pktLayers = append(pktLayers, ip) |
| 672 | pktLayers = append(pktLayers, udp) |
| 673 | pktLayers = append(pktLayers, dhcp4) |
| 674 | logger.Debugw(ctx, "Layers Count", log.Fields{"Count": len(pktLayers)}) |
| 675 | if err := gopacket.SerializeMultiLayers(buff, opts, pktLayers); err != nil { |
| 676 | logger.Errorw(ctx, "Packet Serialization Failed", log.Fields{"Reason": err.Error()}) |
| 677 | return |
| 678 | } |
| 679 | |
| 680 | if err := cntlr.GetController().PacketOutReq(device, vpv.Port, port, buff.Bytes(), false); err != nil { |
| 681 | logger.Errorw(ctx, "PacketOutReq Failed", log.Fields{"Error" : err}) |
| 682 | } |
| 683 | } |
| 684 | } |
| 685 | |
| 686 | // raiseDHCPv4Indication process DHCPv4 packet and raise indication |
| 687 | func raiseDHCPv4Indication(msgType layers.DHCPMsgType, vpv *VoltPortVnet, smac net.HardwareAddr, |
| 688 | ip net.IP, pktPbit uint8, device string, leaseTime int64) { |
| 689 | |
| 690 | logger.Debugw(ctx, "Processing Dhcpv4 packet", log.Fields{"ethsrcMac": smac.String(), |
| 691 | "MacLearningInVPV": vpv.MacLearning, "MacConfigured": vpv.MacAddr, "dhcpType": msgType, |
| 692 | "vlanPriority": pktPbit, "VPVLearntMac": vpv.LearntMacAddr}) |
| 693 | |
| 694 | matchServiceAndRaiseInd := func(key, value interface{}) bool { |
| 695 | // walk through all svcs under vpv and match pbit with packet. |
| 696 | svc := value.(*VoltService) |
| 697 | |
| 698 | if svc.IsPbitExist(of.PbitType(pktPbit)) { |
| 699 | logger.Debugw(ctx, "Matching Pbit found in service config", log.Fields{"ServiceName": svc.Name, "Pbit": pktPbit}) |
| 700 | return false |
| 701 | } |
| 702 | return true |
| 703 | } |
| 704 | |
| 705 | switch msgType { |
| 706 | case layers.DHCPMsgTypeDiscover, layers.DHCPMsgTypeRequest: |
| 707 | if msgType == layers.DHCPMsgTypeDiscover { |
| 708 | vpv.SetDhcpState(DhcpRelayStateDiscover) |
| 709 | } else if msgType == layers.DHCPMsgTypeRequest { |
| 710 | vpv.SetDhcpState(DhcpRelayStateRequest) |
| 711 | } |
| 712 | // Reset learnt mac address in case of DHCPv4 release |
| 713 | case layers.DHCPMsgTypeRelease: |
| 714 | vpv.LearntMacAddr, _ = net.ParseMAC("00:00:00:00:00:00") |
| 715 | vpv.services.Range(matchServiceAndRaiseInd) |
| 716 | vpv.SetDhcpState(DhcpRelayStateRelease) |
| 717 | |
| 718 | case layers.DHCPMsgTypeAck, layers.DHCPMsgTypeNak: |
| 719 | vpv.services.Range(matchServiceAndRaiseInd) |
| 720 | if msgType == layers.DHCPMsgTypeAck { |
| 721 | vpv.SetDhcpState(DhcpRelayStateAck) |
| 722 | } else if msgType == layers.DHCPMsgTypeNak { |
| 723 | vpv.SetDhcpState(DhcpRelayStateNAK) |
| 724 | } |
| 725 | case layers.DHCPMsgTypeOffer: |
| 726 | vpv.SetDhcpState(DhcpRelayStateOffer) |
| 727 | } |
| 728 | } |
| 729 | |
| 730 | // raiseDHCPv6Indication process DHCPv6 packet and raise indication |
| 731 | func raiseDHCPv6Indication(msgType layers.DHCPv6MsgType, vpv *VoltPortVnet, |
| 732 | smac net.HardwareAddr, ip net.IP, pktPbit uint8, device string, leaseTime uint32) { |
| 733 | |
| 734 | logger.Debugw(ctx, "Processing DHCPv6 packet", log.Fields{"dhcpType": msgType, |
| 735 | "vlanPriority": pktPbit, "dhcpClientMac": smac.String(), |
| 736 | "MacLearningInVPV": vpv.MacLearning, "MacConfigured": vpv.MacAddr, |
| 737 | "VPVLearntMac": vpv.LearntMacAddr}) |
| 738 | |
| 739 | matchServiceAndRaiseInd := func(key, value interface{}) bool { |
| 740 | svc := value.(*VoltService) |
| 741 | if svc.IsPbitExist(of.PbitType(pktPbit)) { |
| 742 | logger.Debugw(ctx, "Matching Pbit found in service config", log.Fields{"ServiceName": svc.Name, "Pbit": pktPbit}) |
| 743 | return false |
| 744 | } |
| 745 | return true |
| 746 | } |
| 747 | |
| 748 | switch msgType { |
| 749 | case layers.DHCPv6MsgTypeSolicit: |
| 750 | vpv.SetDhcpv6State(Dhcpv6RelayStateSolicit) |
| 751 | // Reset learnt mac address in case of DHCPv6 release |
| 752 | case layers.DHCPv6MsgTypeRelease: |
| 753 | vpv.LearntMacAddr, _ = net.ParseMAC("00:00:00:00:00:00") |
| 754 | vpv.services.Range(matchServiceAndRaiseInd) |
| 755 | vpv.SetDhcpv6State(Dhcpv6RelayStateRelease) |
| 756 | |
| 757 | case layers.DHCPv6MsgTypeReply: |
| 758 | vpv.services.Range(matchServiceAndRaiseInd) |
| 759 | vpv.SetDhcpv6State(Dhcpv6RelayStateReply) |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | // ProcessUsDhcpv4Packet : The US DHCPv4 packet is identified the DHCP OP in the packet. A request is considered upstream |
| 764 | // and the service associated with the packet is located by the port and VLANs in the packet |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 765 | func (va *VoltApplication) ProcessUsDhcpv4Packet(cntx context.Context, device string, port string, pkt gopacket.Packet) { |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 766 | // We received the packet on an access port and the service for the packet can be |
| 767 | // gotten from the port and the packet |
| 768 | vpv, svc := va.GetVnetFromPkt(device, port, pkt) |
| 769 | if vpv == nil { |
| 770 | logger.Warn(ctx, "VNET couldn't be found from packet") |
| 771 | return |
| 772 | } |
| 773 | |
| 774 | outport, _ := va.GetNniPort(device) |
| 775 | if outport == "" || outport == "0" { |
| 776 | logger.Errorw(ctx, "NNI Port not found for device. Dropping Packet", log.Fields{"NNI": outport}) |
| 777 | return |
| 778 | } |
| 779 | |
| 780 | // Extract the layers in the packet to prepare the outgoing packet |
| 781 | // We use the layers to build the outgoing packet from scratch as |
| 782 | // the packet received can't be modified to add/remove layers |
| 783 | eth := pkt.Layer(layers.LayerTypeEthernet).(*layers.Ethernet) |
| 784 | ip := pkt.Layer(layers.LayerTypeIPv4).(*layers.IPv4) |
| 785 | udp := pkt.Layer(layers.LayerTypeUDP).(*layers.UDP) |
| 786 | dhcp4 := pkt.Layer(layers.LayerTypeDHCPv4).(*layers.DHCPv4) |
| 787 | msgType := DhcpMsgType(dhcp4) |
| 788 | logger.Infow(ctx, "Processing Southbound US DHCPv4 packet", log.Fields{"Device": device, "Port": port, "Type": msgType}) |
| 789 | |
| 790 | // Learn the 8021P values from the packet received |
| 791 | var priority uint8 |
| 792 | var dropEligible bool |
| 793 | dot1ql := pkt.Layer(layers.LayerTypeDot1Q) |
| 794 | if dot1ql != nil { |
| 795 | dot1q := dot1ql.(*layers.Dot1Q) |
| 796 | priority = dot1q.Priority |
| 797 | dropEligible = dot1q.DropEligible |
| 798 | } |
| 799 | // If this is the first message in the DHCP sequence, the service |
| 800 | // is added to the DHCP relay application. The reply packets locate |
| 801 | // the associated service/session from the relay application. |
| 802 | if msgType == layers.DHCPMsgTypeDiscover || msgType == layers.DHCPMsgTypeRequest { |
| 803 | if err := dhcpNws.AddDhcpSession(pkt, vpv); err != nil { |
| 804 | logger.Errorw(ctx, "Adding dhcp session failed", log.Fields{"Error": err}) |
| 805 | } |
| 806 | } |
| 807 | |
| 808 | // Raise mac-learnt(DHCP Discover) indication when mac learning is enabled and learnt mac |
| 809 | // is not same as received mac address. If mac learning disabled, we have mac address in the |
| 810 | // service configuration. Hence mac learnt indication is not raised |
| 811 | // Reset learnt mac address in case of DHCP release and raise the indication |
| 812 | if vpv.DhcpRelay { |
| 813 | // If this is the first message in the DHCP sequence, the service |
| 814 | // is added to the DHCP relay application. The reply packets locate |
| 815 | // the associated service/session from the relay application. |
| 816 | // DS HSIA flows will be added after DHCP ACK . |
| 817 | if msgType == layers.DHCPMsgTypeDiscover || msgType == layers.DHCPMsgTypeRequest { |
| 818 | if !util.MacAddrsMatch(vpv.MacAddr, dhcp4.ClientHWAddr) { |
| 819 | // MAC is different and relearning is disabled. |
| 820 | if NonZeroMacAddress(vpv.MacAddr) && vpv.MacLearning == Learn { |
| 821 | // update learnt mac for debug purpose |
| 822 | vpv.LearntMacAddr = dhcp4.ClientHWAddr |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 823 | vpv.WriteToDb(cntx) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 824 | logger.Warnw(ctx, "Dropping the packet Mac relearn is disabled", |
| 825 | log.Fields{"vpv.MacAddr": vpv.MacAddr, "LearntMac": dhcp4.ClientHWAddr}) |
| 826 | return |
| 827 | } |
| 828 | expectedPort := va.GetMacInPortMap(dhcp4.ClientHWAddr) |
| 829 | if expectedPort != "" && expectedPort != vpv.Port { |
| 830 | logger.Errorw(ctx, "mac-learnt-from-different-port-ignoring-dhcp-message", log.Fields{"MsgType": msgType, "ExpectedPort": expectedPort, "ReceivedPort": vpv.Port, "LearntMacAdrr": vpv.MacAddr, "NewMacAdrr": dhcp4.ClientHWAddr.String()}) |
| 831 | return |
| 832 | } |
| 833 | } |
| 834 | } |
| 835 | raiseDHCPv4Indication(msgType, vpv, dhcp4.ClientHWAddr, vpv.Ipv4Addr, priority, device, 0) |
| 836 | |
| 837 | // Check IsOption82Disabled flag in configuration. if true(disabled), do not add option82 into dhcpv4 header. |
| 838 | // Remote id can be custom or mac address. |
| 839 | // If remote id is custom, then add service will carry the remote id |
| 840 | // If remote id is mac address, and if mac is configured, then add service will carry the remote id |
| 841 | // If remote id is mac address, in mac learning case, then mac has to be taken from dhcp packet |
| 842 | if !svc.IsOption82Disabled { |
| 843 | var remoteID []byte |
| 844 | if svc.RemoteIDType == string(MACAddress) { |
| 845 | remoteID = []byte((dhcp4.ClientHWAddr).String()) |
| 846 | } else if svc.RemoteID != nil { |
| 847 | remoteID = svc.RemoteID |
| 848 | } |
| 849 | AddDhcpv4Option82(svc, remoteID, dhcp4) |
| 850 | } |
| 851 | } |
| 852 | |
| 853 | buff := gopacket.NewSerializeBuffer() |
| 854 | if err := udp.SetNetworkLayerForChecksum(ip); err != nil { |
| 855 | logger.Error(ctx, "Error in setting checksum") |
| 856 | return |
| 857 | } |
| 858 | opts := gopacket.SerializeOptions{ |
| 859 | FixLengths: true, |
| 860 | ComputeChecksums: true, |
| 861 | } |
| 862 | |
| 863 | cTagType := layers.EthernetTypeIPv4 |
| 864 | outerVlan, innerVlan := vpv.GetNniVlans() |
| 865 | logger.Debugw(ctx, "Vnet Vlans", log.Fields{"Svlan": outerVlan, "Cvlan": innerVlan}) |
| 866 | eth.EthernetType = vpv.SVlanTpid |
| 867 | |
| 868 | var pktLayers []gopacket.SerializableLayer |
| 869 | pktLayers = append(pktLayers, eth) |
| 870 | |
| 871 | var qVlans []of.VlanType |
| 872 | var qVlanLayers []gopacket.SerializableLayer |
| 873 | |
| 874 | if vpv.AllowTransparent { |
| 875 | nxtLayer := layers.EthernetTypeDot1Q |
| 876 | if vlans := GetVlans(pkt); len(vlans) > 1 { |
| 877 | qVlans = vlans[1:] |
| 878 | logger.Debugw(ctx, "Q Vlans", log.Fields{"Vlan List": qVlans}) |
| 879 | cTagType = layers.EthernetTypeDot1Q |
| 880 | } |
| 881 | for i, qVlan := range qVlans { |
| 882 | vlan := uint16(qVlan) |
| 883 | if i == (len(qVlans) - 1) { |
| 884 | nxtLayer = layers.EthernetTypeIPv4 |
| 885 | } |
| 886 | qdot1q := &layers.Dot1Q{Priority: priority, VLANIdentifier: vlan, DropEligible: dropEligible, Type: nxtLayer} |
| 887 | qVlanLayers = append(qVlanLayers, qdot1q) |
| 888 | } |
| 889 | } |
| 890 | switch vpv.VlanControl { |
| 891 | case ONUCVlanOLTSVlan, |
| 892 | OLTCVlanOLTSVlan: |
| 893 | sdot1q := &layers.Dot1Q{Priority: priority, VLANIdentifier: outerVlan, DropEligible: dropEligible, Type: layers.EthernetTypeDot1Q} |
| 894 | pktLayers = append(pktLayers, sdot1q) |
| 895 | cdot1q := &layers.Dot1Q{Priority: priority, VLANIdentifier: innerVlan, DropEligible: dropEligible, Type: cTagType} |
| 896 | pktLayers = append(pktLayers, cdot1q) |
| 897 | case ONUCVlan, |
| 898 | OLTSVlan, |
| 899 | None: |
| 900 | cdot1q := &layers.Dot1Q{Priority: priority, VLANIdentifier: outerVlan, DropEligible: dropEligible, Type: cTagType} |
| 901 | pktLayers = append(pktLayers, cdot1q) |
| 902 | default: |
| 903 | logger.Errorw(ctx, "Invalid Vlan Control Option", log.Fields{"Value": vpv.VlanControl}) |
| 904 | } |
| 905 | |
| 906 | pktLayers = append(pktLayers, qVlanLayers...) |
| 907 | pktLayers = append(pktLayers, ip) |
| 908 | pktLayers = append(pktLayers, udp) |
| 909 | pktLayers = append(pktLayers, dhcp4) |
| 910 | logger.Debugw(ctx, "Layers Count", log.Fields{"Count": len(pktLayers)}) |
| 911 | if err := gopacket.SerializeMultiLayers(buff, opts, pktLayers); err != nil { |
| 912 | return |
| 913 | } |
| 914 | |
| 915 | // Now the packet constructed is output towards the switch to be emitted on |
| 916 | // the NNI port |
| 917 | if err := cntlr.GetController().PacketOutReq(device, outport, port, buff.Bytes(), false); err != nil { |
| 918 | logger.Errorw(ctx, "PacketOutReq Failed", log.Fields{"Error" : err}) |
| 919 | } |
| 920 | if vpv.DhcpRelay { |
| 921 | // Inform dhcp request information to dhcp server handler |
| 922 | dhcpRequestReceived(uint16(vpv.CVlan), uint16(vpv.SVlan), eth.SrcMAC.String()) |
| 923 | } |
| 924 | } |
| 925 | |
| 926 | // ProcessUDP4Packet : CallBack function registered with application to handle DHCP packetIn |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 927 | func ProcessUDP4Packet(cntx context.Context, device string, port string, pkt gopacket.Packet) { |
| 928 | GetApplication().ProcessUDP4Packet(cntx, device, port, pkt) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 929 | } |
| 930 | |
| 931 | // ProcessUDP4Packet : The packet is a UDP packet and currently only DHCP relay application is supported |
| 932 | // We determine the packet direction and process it based on the direction |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 933 | func (va *VoltApplication) ProcessUDP4Packet(cntx context.Context, device string, port string, pkt gopacket.Packet) { |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 934 | // Currently DHCP is the only application supported by the application |
| 935 | // We check for DHCP before proceeding futher. In future, this could be |
| 936 | // based on registration and the callbacks |
| 937 | dhcpl := pkt.Layer(layers.LayerTypeDHCPv4) |
| 938 | if dhcpl == nil { |
| 939 | return |
| 940 | } |
| 941 | //logger.Debugw(ctx, "Received Packet In", log.Fields{"Pkt": hex.EncodeToString(pkt.Data())}) |
| 942 | dhcp4 := pkt.Layer(layers.LayerTypeDHCPv4).(*layers.DHCPv4) |
| 943 | if dhcp4.Operation == layers.DHCPOpRequest { |
| 944 | // This is treated as an upstream packet in the VOLT application |
| 945 | // as VOLT serves access subscribers who use DHCP to acquire IP |
| 946 | // address and these packets go upstream to the network |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 947 | va.ProcessUsDhcpv4Packet(cntx, device, port, pkt) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 948 | } else { |
| 949 | // This is a downstream packet |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 950 | va.ProcessDsDhcpv4Packet(cntx, device, port, pkt) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 951 | } |
| 952 | |
| 953 | } |
| 954 | |
| 955 | // ProcessUDP6Packet : CallBack function registered with application to handle DHCPv6 packetIn |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 956 | func ProcessUDP6Packet(cntx context.Context, device string, port string, pkt gopacket.Packet) { |
| 957 | GetApplication().ProcessUDP6Packet(cntx, device, port, pkt) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 958 | } |
| 959 | |
| 960 | // ProcessUDP6Packet : As a LDRA node, we expect to see only RelayReply from the DHCP server and we always |
| 961 | // pack the received request and send it to the server as a RelayForward message |
| 962 | // We expect to see Solicit, Request in the most normal cases. Before the lease expires |
| 963 | // we should also see Renew. However, we should always pack the US message by adding |
| 964 | // additional option that identifies to the server that the DHCP packet is forwarded |
| 965 | // by an LDRA node. |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 966 | func (va *VoltApplication) ProcessUDP6Packet(cntx context.Context, device string, port string, pkt gopacket.Packet) []byte { |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 967 | dhcpl := pkt.Layer(layers.LayerTypeDHCPv6) |
| 968 | if dhcpl == nil { |
| 969 | return nil |
| 970 | } |
| 971 | logger.Infow(ctx, "Processing DHCPv6 packet", log.Fields{"Port": port}) |
| 972 | dhcpv6 := dhcpl.(*layers.DHCPv6) |
| 973 | switch dhcpv6.MsgType { |
| 974 | case layers.DHCPv6MsgTypeSolicit, layers.DHCPv6MsgTypeRequest, layers.DHCPv6MsgTypeRenew, |
| 975 | layers.DHCPv6MsgTypeRelease, layers.DHCPv6MsgTypeRebind, layers.DHCPv6MsgTypeInformationRequest, |
| 976 | layers.DHCPv6MsgTypeDecline: |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 977 | va.ProcessUsDhcpv6Packet(cntx, device, port, pkt) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 978 | case layers.DHCPv6MsgTypeAdvertise, layers.DHCPv6MsgTypeConfirm, layers.DHCPv6MsgTypeReconfigure: |
| 979 | logger.Warnw(ctx, "SouthBound DHCPv6 DS Messages Expected For a Relay Agent", log.Fields{"Type": dhcpv6.MsgType}) |
| 980 | case layers.DHCPv6MsgTypeRelayForward: |
| 981 | logger.Warn(ctx, "As the first DHCPv6 Relay Agent, Unexpected Relay Forward") |
| 982 | case layers.DHCPv6MsgTypeRelayReply: |
| 983 | // We received a response from the server |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 984 | va.ProcessDsDhcpv6Packet(cntx, device, port, pkt) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 985 | } |
| 986 | return nil |
| 987 | } |
| 988 | |
| 989 | // GetRelayReplyBytes to get relay reply bytes |
| 990 | func GetRelayReplyBytes(dhcp6 *layers.DHCPv6) []byte { |
| 991 | for _, o := range dhcp6.Options { |
| 992 | logger.Infow(ctx, "Received Option", log.Fields{"Code": o.Code}) |
| 993 | if o.Code == layers.DHCPv6OptRelayMessage { |
| 994 | return o.Data |
| 995 | } |
| 996 | } |
| 997 | return nil |
| 998 | } |
| 999 | |
| 1000 | // BuildRelayFwd to build forward relay |
| 1001 | func BuildRelayFwd(paddr net.IP, intfID []byte, remoteID []byte, payload []byte, isOption82Disabled bool, dhcpRelay bool) *layers.DHCPv6 { |
| 1002 | dhcp6 := &layers.DHCPv6{MsgType: layers.DHCPv6MsgTypeRelayForward, LinkAddr: net.ParseIP("::"), PeerAddr: []byte(paddr)} |
| 1003 | dhcp6.Options = append(dhcp6.Options, layers.NewDHCPv6Option(layers.DHCPv6OptRelayMessage, payload)) |
| 1004 | // Check IsOption82Disabled flag in configuration. if true(disabled), do not add remoteID and circuitID into dhcpv6 header. |
| 1005 | if dhcpRelay { |
| 1006 | if !isOption82Disabled { |
| 1007 | remote := &layers.DHCPv6RemoteId{RemoteId: remoteID} |
| 1008 | if len(remoteID) != 0 { |
| 1009 | dhcp6.Options = append(dhcp6.Options, layers.NewDHCPv6Option(layers.DHCPv6OptRemoteID, remote.Encode())) |
| 1010 | } |
| 1011 | if len(intfID) != 0 { |
| 1012 | intf := &layers.DHCPv6IntfId{Data: intfID} |
| 1013 | dhcp6.Options = append(dhcp6.Options, layers.NewDHCPv6Option(layers.DHCPv6OptInterfaceID, intf.Encode())) |
| 1014 | } |
| 1015 | } |
| 1016 | } |
| 1017 | return dhcp6 |
| 1018 | } |
| 1019 | |
| 1020 | // ProcessUsDhcpv6Packet to rpocess upstream DHCPv6 packet |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 1021 | func (va *VoltApplication) ProcessUsDhcpv6Packet(cntx context.Context, device string, port string, pkt gopacket.Packet) { |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 1022 | // We received the packet on an access port and the service for the packet can be |
| 1023 | // gotten from the port and the packet |
| 1024 | logger.Infow(ctx, "Processing Southbound US DHCPv6 packet", log.Fields{"Port": port}) |
| 1025 | logger.Debugw(ctx, "Packet IN", log.Fields{"Pkt": hex.EncodeToString(pkt.Data())}) |
| 1026 | vpv, svc := va.GetVnetFromPkt(device, port, pkt) |
| 1027 | if vpv == nil { |
| 1028 | logger.Warn(ctx, "VNET couldn't be found from packet") |
| 1029 | return |
| 1030 | } |
| 1031 | |
| 1032 | outport, _ := va.GetNniPort(device) |
| 1033 | if outport == "" || outport == "0" { |
| 1034 | logger.Errorw(ctx, "NNI Port not found for device. Dropping Packet", log.Fields{"NNI": outport}) |
| 1035 | return |
| 1036 | } |
| 1037 | |
| 1038 | // Extract the layers in the packet to prepare the outgoing packet |
| 1039 | // We use the layers to build the outgoing packet from scratch as |
| 1040 | // the packet received can't be modified to add/remove layers |
| 1041 | eth := pkt.Layer(layers.LayerTypeEthernet).(*layers.Ethernet) |
| 1042 | ip := pkt.Layer(layers.LayerTypeIPv6).(*layers.IPv6) |
| 1043 | udp := pkt.Layer(layers.LayerTypeUDP).(*layers.UDP) |
| 1044 | idhcp6 := pkt.Layer(layers.LayerTypeDHCPv6).(*layers.DHCPv6) |
| 1045 | |
| 1046 | // Remote id can be custom or mac address. |
| 1047 | // If remote id is custom, then add service will carry the remote id |
| 1048 | // If remote id is mac address, and if mac is configured, then add service will carry the remote id |
| 1049 | // If remote id is mac address, in mac learning case, then mac has to be taken from dhcp packet |
| 1050 | var remoteID []byte |
| 1051 | if svc.RemoteIDType == string(MACAddress) { |
| 1052 | remoteID = []byte((eth.SrcMAC).String()) |
| 1053 | } else if svc.RemoteID != nil { |
| 1054 | remoteID = svc.RemoteID |
| 1055 | } |
| 1056 | dhcp6 := BuildRelayFwd(ip.SrcIP, svc.GetCircuitID(), remoteID, udp.Payload, svc.IsOption82Disabled, vpv.DhcpRelay) |
| 1057 | |
| 1058 | var sourceMac = eth.SrcMAC |
| 1059 | var sessionKey [MaxLenDhcpv6DUID]byte |
| 1060 | |
| 1061 | clientDuid, decodedDuid := getDhcpv6ClientDUID(idhcp6) |
| 1062 | if clientDuid == nil || decodedDuid == nil { |
| 1063 | copy(sessionKey[:], eth.SrcMAC) |
| 1064 | } else { |
| 1065 | copy(sessionKey[:], clientDuid[0:]) |
| 1066 | if decodedDuid.Type == layers.DHCPv6DUIDTypeLLT || decodedDuid.Type == layers.DHCPv6DUIDTypeLL { |
| 1067 | sourceMac = decodedDuid.LinkLayerAddress |
| 1068 | } |
| 1069 | } |
| 1070 | // Learn the 8021P values from the packet received |
| 1071 | var priority uint8 |
| 1072 | var dropEligible bool |
| 1073 | dot1ql := pkt.Layer(layers.LayerTypeDot1Q) |
| 1074 | if dot1ql != nil { |
| 1075 | dot1q := dot1ql.(*layers.Dot1Q) |
| 1076 | priority = dot1q.Priority |
| 1077 | dropEligible = dot1q.DropEligible |
| 1078 | } |
| 1079 | if idhcp6.MsgType == layers.DHCPv6MsgTypeSolicit { |
| 1080 | if err := dhcpNws.AddDhcp6Session(sessionKey, vpv); err != nil { |
| 1081 | logger.Errorw(ctx, "Adding dhcpv6 session failed", log.Fields{"Error": err}) |
| 1082 | } |
| 1083 | vpv.DHCPv6DUID = sessionKey |
| 1084 | } |
| 1085 | |
| 1086 | // Raise mac-learnt(DHCPv6MsgTypeSolicit) indication when mac learning is enabled and learnt mac |
| 1087 | // is not same as received mac address. If mac learning disabled, we have mac address in the |
| 1088 | // service configuration. Hence mac learnt indication is not raised |
| 1089 | if vpv.DhcpRelay { |
| 1090 | if idhcp6.MsgType == layers.DHCPv6MsgTypeSolicit { |
| 1091 | if !util.MacAddrsMatch(vpv.MacAddr, sourceMac) { |
| 1092 | // MAC is different and relearning is disabled. |
| 1093 | if NonZeroMacAddress(vpv.MacAddr) && vpv.MacLearning == Learn { |
| 1094 | // update learnt mac for debug purpose |
| 1095 | vpv.LearntMacAddr = sourceMac |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 1096 | vpv.WriteToDb(cntx) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 1097 | logger.Warnw(ctx, "Dropping the packet Mac relearn is disabled", |
| 1098 | log.Fields{"vpv.MacAddr": vpv.MacAddr, "LearntMac": sourceMac}) |
| 1099 | return |
| 1100 | } |
| 1101 | expectedPort := va.GetMacInPortMap(sourceMac) |
| 1102 | if expectedPort != "" && expectedPort != vpv.Port { |
| 1103 | logger.Errorw(ctx, "mac-learnt-from-different-port-ignoring-dhcp-message", log.Fields{"MsgType": idhcp6.MsgType, "ExpectedPort": expectedPort, "ReceivedPort": vpv.Port, "LearntMacAdrr": vpv.MacAddr, "NewMacAdrr": sourceMac.String()}) |
| 1104 | return |
| 1105 | } |
| 1106 | } |
| 1107 | } |
| 1108 | raiseDHCPv6Indication(idhcp6.MsgType, vpv, sourceMac, vpv.Ipv6Addr, priority, device, 0) |
| 1109 | } |
| 1110 | |
| 1111 | // Create the buffer and the encode options for the outgoing packet |
| 1112 | buff := gopacket.NewSerializeBuffer() |
| 1113 | if err := udp.SetNetworkLayerForChecksum(ip); err != nil { |
| 1114 | logger.Error(ctx, "Error in setting checksum") |
| 1115 | return |
| 1116 | } |
| 1117 | opts := gopacket.SerializeOptions{ |
| 1118 | FixLengths: true, |
| 1119 | ComputeChecksums: true, |
| 1120 | } |
| 1121 | |
| 1122 | cTagType := layers.EthernetTypeIPv6 |
| 1123 | outerVlan, innerVlan := vpv.GetNniVlans() |
| 1124 | eth.EthernetType = vpv.SVlanTpid |
| 1125 | |
| 1126 | var pktLayers []gopacket.SerializableLayer |
| 1127 | pktLayers = append(pktLayers, eth) |
| 1128 | |
| 1129 | var qVlans []of.VlanType |
| 1130 | var qVlanLayers []gopacket.SerializableLayer |
| 1131 | |
| 1132 | if vpv.AllowTransparent { |
| 1133 | nxtLayer := layers.EthernetTypeDot1Q |
| 1134 | if vlans := GetVlans(pkt); len(vlans) > 1 { |
| 1135 | qVlans = vlans[1:] |
| 1136 | cTagType = layers.EthernetTypeDot1Q |
| 1137 | } |
| 1138 | for i, qVlan := range qVlans { |
| 1139 | vlan := uint16(qVlan) |
| 1140 | if i == (len(qVlans) - 1) { |
| 1141 | nxtLayer = layers.EthernetTypeIPv6 |
| 1142 | } |
| 1143 | qdot1q := &layers.Dot1Q{Priority: priority, VLANIdentifier: vlan, DropEligible: dropEligible, Type: nxtLayer} |
| 1144 | qVlanLayers = append(qVlanLayers, qdot1q) |
| 1145 | } |
| 1146 | |
| 1147 | } |
| 1148 | switch vpv.VlanControl { |
| 1149 | case ONUCVlanOLTSVlan, |
| 1150 | OLTCVlanOLTSVlan: |
| 1151 | sdot1q := &layers.Dot1Q{Priority: priority, VLANIdentifier: outerVlan, DropEligible: dropEligible, Type: layers.EthernetTypeDot1Q} |
| 1152 | pktLayers = append(pktLayers, sdot1q) |
| 1153 | cdot1q := &layers.Dot1Q{Priority: priority, VLANIdentifier: innerVlan, DropEligible: dropEligible, Type: cTagType} |
| 1154 | pktLayers = append(pktLayers, cdot1q) |
| 1155 | case ONUCVlan, |
| 1156 | OLTSVlan, |
| 1157 | None: |
| 1158 | cdot1q := &layers.Dot1Q{Priority: priority, VLANIdentifier: outerVlan, DropEligible: dropEligible, Type: cTagType} |
| 1159 | pktLayers = append(pktLayers, cdot1q) |
| 1160 | default: |
| 1161 | logger.Errorw(ctx, "Invalid Vlan Control Option", log.Fields{"Value": vpv.VlanControl}) |
| 1162 | } |
| 1163 | |
| 1164 | pktLayers = append(pktLayers, qVlanLayers...) |
| 1165 | pktLayers = append(pktLayers, ip) |
| 1166 | pktLayers = append(pktLayers, udp) |
| 1167 | pktLayers = append(pktLayers, dhcp6) |
| 1168 | logger.Debugw(ctx, "Layers Count", log.Fields{"Count": len(pktLayers)}) |
| 1169 | if err := gopacket.SerializeMultiLayers(buff, opts, pktLayers); err != nil { |
| 1170 | return |
| 1171 | } |
| 1172 | // Now the packet constructed is output towards the switch to be emitted on |
| 1173 | // the NNI port |
| 1174 | if err := cntlr.GetController().PacketOutReq(device, outport, port, buff.Bytes(), false); err != nil { |
| 1175 | logger.Errorw(ctx, "PacketOutReq Failed", log.Fields{"Error" : err}) |
| 1176 | } |
| 1177 | if vpv.DhcpRelay { |
| 1178 | // Inform dhcp request information to dhcp server handler |
| 1179 | dhcpRequestReceived(uint16(vpv.CVlan), uint16(vpv.SVlan), eth.SrcMAC.String()) |
| 1180 | } |
| 1181 | } |
| 1182 | |
| 1183 | // GetDhcpv6 to get dhcpv6 info |
| 1184 | func GetDhcpv6(payload []byte) (*layers.DHCPv6, error) { |
| 1185 | pkt := gopacket.NewPacket(payload, layers.LayerTypeDHCPv6, gopacket.Default) |
| 1186 | if dl := pkt.Layer(layers.LayerTypeDHCPv6); dl != nil { |
| 1187 | if dhcp6, ok := dl.(*layers.DHCPv6); ok { |
| 1188 | return dhcp6, nil |
| 1189 | } |
| 1190 | } |
| 1191 | return nil, errors.New("Failed to decode DHCPv6") |
| 1192 | } |
| 1193 | |
| 1194 | // ProcessDsDhcpv6Packet to process downstream dhcpv6 packet |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 1195 | func (va *VoltApplication) ProcessDsDhcpv6Packet(cntx context.Context, device string, port string, pkt gopacket.Packet) { |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 1196 | logger.Infow(ctx, "Processing Southbound DS DHCPv6 packet", log.Fields{"Port": port}) |
| 1197 | logger.Debugw(ctx, "Packet IN", log.Fields{"Pkt": hex.EncodeToString(pkt.Data())}) |
| 1198 | |
| 1199 | // Retrieve the layers to build the outgoing packet. It is not |
| 1200 | // possible to add/remove layers to the existing packet and thus |
| 1201 | // the lyayers are extracted to build the outgoing packet |
| 1202 | // The DHCP layer is handled differently. The Relay-Reply option |
| 1203 | // of DHCP is extracted and is made the UDP payload. |
| 1204 | eth := pkt.Layer(layers.LayerTypeEthernet).(*layers.Ethernet) |
| 1205 | ip := pkt.Layer(layers.LayerTypeIPv6).(*layers.IPv6) |
| 1206 | udp := pkt.Layer(layers.LayerTypeUDP).(*layers.UDP) |
| 1207 | idhcp6 := pkt.Layer(layers.LayerTypeDHCPv6).(*layers.DHCPv6) |
| 1208 | //var dhcp6 *layers.DHCPv6 |
| 1209 | var payload []byte |
| 1210 | if payload = GetRelayReplyBytes(idhcp6); payload == nil { |
| 1211 | logger.Warn(ctx, "Didn't Receive RelayMessage IE") |
| 1212 | return |
| 1213 | } |
| 1214 | |
| 1215 | dhcp6, err := GetDhcpv6(payload) |
| 1216 | if err != nil { |
| 1217 | logger.Warnw(ctx, "DHCPv6 Decode Failed", log.Fields{"Reason": err.Error()}) |
| 1218 | return |
| 1219 | } |
| 1220 | |
| 1221 | // Learn the 8021P values from the packet received |
| 1222 | var priority uint8 |
| 1223 | var dsPbit uint8 |
| 1224 | var dropEligible bool |
| 1225 | dot1ql := pkt.Layer(layers.LayerTypeDot1Q) |
| 1226 | if dot1ql != nil { |
| 1227 | dot1q := dot1ql.(*layers.Dot1Q) |
| 1228 | priority = dot1q.Priority |
| 1229 | dropEligible = dot1q.DropEligible |
| 1230 | } |
| 1231 | |
| 1232 | pktInnerlan, pktOuterlan := GetVlansFromPacket(pkt) |
| 1233 | vpvList, clientMac, err := GetVnetForV6Nni(dhcp6, pktInnerlan, pktOuterlan, priority, eth.DstMAC) |
| 1234 | if len(vpvList) == 0 { |
| 1235 | logger.Warnw(ctx, "VNET couldn't be found for NNI", log.Fields{"Reason": err}) |
| 1236 | return |
| 1237 | } |
| 1238 | |
| 1239 | ipv6Addr, leaseTime := GetIpv6Addr(dhcp6) |
| 1240 | |
| 1241 | for _, vpv := range vpvList { |
| 1242 | |
| 1243 | dsPbit = vpv.GetRemarkedPriority(priority) |
| 1244 | // Raise DHCPv6 Reply indication |
| 1245 | if vpv.DhcpRelay { |
| 1246 | // Inform dhcp response information to dhcp server handler |
| 1247 | dhcpResponseReceived(uint16(vpv.CVlan), uint16(vpv.SVlan)) |
| 1248 | |
| 1249 | if dhcp6.MsgType == layers.DHCPv6MsgTypeReply && ipv6Addr != nil { |
| 1250 | // separate go rotuine is spawned to avoid drop of ACK packet |
| 1251 | // as HSIA flows will be deleted if new MAC is learnt. |
| 1252 | if len(vpvList) == 1 { |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 1253 | go vpv.SetMacAddr(cntx, clientMac) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 1254 | } |
Tinoj Joseph | 07cc537 | 2022-07-18 22:53:51 +0530 | [diff] [blame^] | 1255 | vpv.Dhcpv6ResultInd(cntx, ipv6Addr, leaseTime) |
Naveen Sampath | 04696f7 | 2022-06-13 15:19:14 +0530 | [diff] [blame] | 1256 | } |
| 1257 | raiseDHCPv6Indication(dhcp6.MsgType, vpv, clientMac, ipv6Addr, dsPbit, device, leaseTime) |
| 1258 | } |
| 1259 | |
| 1260 | //Replace dst Port value to 546 |
| 1261 | udp.DstPort = 546 |
| 1262 | logger.Infow(ctx, "Packet Out UDP Port..", log.Fields{"UDP": udp, "Port": udp.DstPort}) |
| 1263 | |
| 1264 | // Create the buffer and the encode options for the outgoing packet |
| 1265 | buff := gopacket.NewSerializeBuffer() |
| 1266 | if err := udp.SetNetworkLayerForChecksum(ip); err != nil { |
| 1267 | logger.Error(ctx, "Error in setting checksum") |
| 1268 | return |
| 1269 | } |
| 1270 | opts := gopacket.SerializeOptions{ |
| 1271 | FixLengths: true, |
| 1272 | ComputeChecksums: true, |
| 1273 | } |
| 1274 | |
| 1275 | cTagType := layers.EthernetTypeIPv6 |
| 1276 | eth.EthernetType = layers.EthernetTypeDot1Q |
| 1277 | |
| 1278 | var pktLayers []gopacket.SerializableLayer |
| 1279 | pktLayers = append(pktLayers, eth) |
| 1280 | |
| 1281 | var qVlans []of.VlanType |
| 1282 | var qVlanLayers []gopacket.SerializableLayer |
| 1283 | |
| 1284 | if vpv.AllowTransparent { |
| 1285 | vlanThreshold := 2 |
| 1286 | // In case of ONU_CVLAN or OLT_SVLAN, the DS pkts have single configured vlan |
| 1287 | // In case of ONU_CVLAN_OLT_SVLAN or OLT_CVLAN_OLT_SVLAN, the DS pkts have 2 configured vlan |
| 1288 | // Based on that, the no. of vlans should be ignored to get only transparent vlans |
| 1289 | if vpv.VlanControl == ONUCVlan || vpv.VlanControl == OLTSVlan || vpv.VlanControl == None { |
| 1290 | vlanThreshold = 1 |
| 1291 | } |
| 1292 | nxtLayer := layers.EthernetTypeDot1Q |
| 1293 | if vlans := GetVlans(pkt); len(vlans) > vlanThreshold { |
| 1294 | qVlans = vlans[vlanThreshold:] |
| 1295 | cTagType = layers.EthernetTypeDot1Q |
| 1296 | } |
| 1297 | for i, qVlan := range qVlans { |
| 1298 | vlan := uint16(qVlan) |
| 1299 | if i == (len(qVlans) - 1) { |
| 1300 | nxtLayer = layers.EthernetTypeIPv6 |
| 1301 | } |
| 1302 | qdot1q := &layers.Dot1Q{Priority: priority, VLANIdentifier: vlan, DropEligible: dropEligible, Type: nxtLayer} |
| 1303 | qVlanLayers = append(qVlanLayers, qdot1q) |
| 1304 | } |
| 1305 | |
| 1306 | } |
| 1307 | switch vpv.VlanControl { |
| 1308 | case ONUCVlanOLTSVlan: |
| 1309 | cdot1q := &layers.Dot1Q{Priority: dsPbit, VLANIdentifier: uint16(vpv.CVlan), DropEligible: dropEligible, Type: cTagType} |
| 1310 | pktLayers = append(pktLayers, cdot1q) |
| 1311 | case ONUCVlan, |
| 1312 | None: |
| 1313 | sdot1q := &layers.Dot1Q{Priority: dsPbit, VLANIdentifier: uint16(vpv.SVlan), DropEligible: dropEligible, Type: cTagType} |
| 1314 | pktLayers = append(pktLayers, sdot1q) |
| 1315 | case OLTCVlanOLTSVlan, |
| 1316 | OLTSVlan: |
| 1317 | udot1q := &layers.Dot1Q{Priority: dsPbit, VLANIdentifier: uint16(vpv.UniVlan), DropEligible: dropEligible, Type: cTagType} |
| 1318 | pktLayers = append(pktLayers, udot1q) |
| 1319 | default: |
| 1320 | logger.Errorw(ctx, "Invalid Vlan Control Option", log.Fields{"Value": vpv.VlanControl}) |
| 1321 | } |
| 1322 | |
| 1323 | pktLayers = append(pktLayers, qVlanLayers...) |
| 1324 | pktLayers = append(pktLayers, ip) |
| 1325 | pktLayers = append(pktLayers, udp) |
| 1326 | pktLayers = append(pktLayers, dhcp6) |
| 1327 | logger.Debugw(ctx, "Layers Count", log.Fields{"Count": len(pktLayers)}) |
| 1328 | if err := gopacket.SerializeMultiLayers(buff, opts, pktLayers); err != nil { |
| 1329 | logger.Errorw(ctx, "Packet Serialization Failed", log.Fields{"Reason": err.Error()}) |
| 1330 | return |
| 1331 | } |
| 1332 | |
| 1333 | if err := cntlr.GetController().PacketOutReq(device, vpv.Port, port, buff.Bytes(), false); err != nil { |
| 1334 | logger.Errorw(ctx, "PacketOutReq Failed", log.Fields{"Reason": err.Error()}) |
| 1335 | } |
| 1336 | } |
| 1337 | } |
| 1338 | |
| 1339 | // The DHCP relay application is maintained within the structures below |
| 1340 | var dhcpNws *DhcpNetworks |
| 1341 | |
| 1342 | func init() { |
| 1343 | dhcpNws = NewDhcpNetworks() |
| 1344 | } |