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/***
Copyright 2014 Cisco Systems Inc. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package drivers
import (
"encoding/json"
"fmt"
"strconv"
log "github.com/Sirupsen/logrus"
"github.com/contiv/netplugin/core"
"github.com/contiv/netplugin/netmaster/mastercfg"
)
type oper int
// OvsDriverConfig defines the configuration required to initialize the
// OvsDriver.
type OvsDriverConfig struct {
Ovs struct {
DbIP string
DbPort int
}
}
// OvsDriverOperState carries operational state of the OvsDriver.
type OvsDriverOperState struct {
core.CommonState
// used to allocate port names. XXX: should it be user controlled?
CurrPortNum int `json:"currPortNum"`
}
// Write the state
func (s *OvsDriverOperState) Write() error {
key := fmt.Sprintf(ovsOperPath, s.ID)
return s.StateDriver.WriteState(key, s, json.Marshal)
}
// Read the state given an ID.
func (s *OvsDriverOperState) Read(id string) error {
key := fmt.Sprintf(ovsOperPath, id)
return s.StateDriver.ReadState(key, s, json.Unmarshal)
}
// ReadAll reads all the state
func (s *OvsDriverOperState) ReadAll() ([]core.State, error) {
return s.StateDriver.ReadAllState(ovsOperPathPrefix, s, json.Unmarshal)
}
// Clear removes the state.
func (s *OvsDriverOperState) Clear() error {
key := fmt.Sprintf(ovsOperPath, s.ID)
return s.StateDriver.ClearState(key)
}
// OvsDriver implements the Layer 2 Network and Endpoint Driver interfaces
// specific to vlan based open-vswitch.
type OvsDriver struct {
oper OvsDriverOperState // Oper state of the driver
localIP string // Local IP address
switchDb map[string]*OvsSwitch // OVS switch instances
}
func (d *OvsDriver) getIntfName() string {
return fmt.Sprintf(portNameFmt, d.oper.CurrPortNum)
}
// Init initializes the OVS driver.
func (d *OvsDriver) Init(config *core.Config, info *core.InstanceInfo) error {
if config == nil || info == nil || info.StateDriver == nil {
return core.Errorf("Invalid arguments. cfg: %+v, instance-info: %+v",
config, info)
}
_, ok := config.V.(*OvsDriverConfig)
if !ok {
return core.Errorf("Invalid type passed")
}
d.oper.StateDriver = info.StateDriver
d.localIP = info.VtepIP
// restore the driver's runtime state if it exists
err := d.oper.Read(info.HostLabel)
if core.ErrIfKeyExists(err) != nil {
log.Printf("Failed to read driver oper state for key %q. Error: %s",
info.HostLabel, err)
return err
} else if err != nil {
// create the oper state as it is first time start up
d.oper.ID = info.HostLabel
d.oper.CurrPortNum = 0
err = d.oper.Write()
if err != nil {
return err
}
}
log.Infof("Initializing ovsdriver")
// Init switch DB
d.switchDb = make(map[string]*OvsSwitch)
// Create Vxlan switch
d.switchDb["vxlan"], err = NewOvsSwitch(vxlanBridgeName, "vxlan", info.VtepIP)
if err != nil {
log.Fatalf("Error creating vlan switch. Err: %v", err)
}
// Create Vlan switch
d.switchDb["vlan"], err = NewOvsSwitch(vlanBridgeName, "vlan", info.VtepIP)
if err != nil {
log.Fatalf("Error creating vlan switch. Err: %v", err)
}
// Add uplink to VLAN switch
if info.VlanIntf != "" {
err = d.switchDb["vlan"].AddUplinkPort(info.VlanIntf)
if err != nil {
log.Errorf("Could not add uplink %s to vlan OVS. Err: %v", info.VlanIntf, err)
}
}
return nil
}
// Deinit performs cleanup prior to destruction of the OvsDriver
func (d *OvsDriver) Deinit() {
log.Infof("Cleaning up ovsdriver")
// cleanup both vlan and vxlan OVS instances
if d.switchDb["vlan"] != nil {
d.switchDb["vlan"].Delete()
}
if d.switchDb["vxlan"] != nil {
d.switchDb["vxlan"].Delete()
}
}
// CreateNetwork creates a network by named identifier
func (d *OvsDriver) CreateNetwork(id string) error {
cfgNw := mastercfg.CfgNetworkState{}
cfgNw.StateDriver = d.oper.StateDriver
err := cfgNw.Read(id)
if err != nil {
log.Errorf("Failed to read net %s \n", cfgNw.ID)
return err
}
log.Infof("create net %s \n", cfgNw.ID)
// Find the switch based on network type
var sw *OvsSwitch
if cfgNw.PktTagType == "vxlan" {
sw = d.switchDb["vxlan"]
} else {
sw = d.switchDb["vlan"]
}
return sw.CreateNetwork(uint16(cfgNw.PktTag), uint32(cfgNw.ExtPktTag))
}
// DeleteNetwork deletes a network by named identifier
func (d *OvsDriver) DeleteNetwork(id, encap string, pktTag, extPktTag int) error {
log.Infof("delete net %s \n", id)
// Find the switch based on network type
var sw *OvsSwitch
if encap == "vxlan" {
sw = d.switchDb["vxlan"]
} else {
sw = d.switchDb["vlan"]
}
return sw.DeleteNetwork(uint16(pktTag), uint32(extPktTag))
}
// CreateEndpoint creates an endpoint by named identifier
func (d *OvsDriver) CreateEndpoint(id string) error {
var (
err error
intfName string
)
cfgEp := &mastercfg.CfgEndpointState{}
cfgEp.StateDriver = d.oper.StateDriver
err = cfgEp.Read(id)
if err != nil {
return err
}
cfgEpGroup := &mastercfg.EndpointGroupState{}
cfgEpGroup.StateDriver = d.oper.StateDriver
err = cfgEpGroup.Read(strconv.Itoa(cfgEp.EndpointGroupID))
if err == nil {
log.Debugf("pktTag: %v ", cfgEpGroup.PktTag)
} else if core.ErrIfKeyExists(err) == nil {
// FIXME: this should be deprecated once we remove old style intent
// In case EpGroup is not specified, get the tag from nw.
// this is mainly for the intent based system tests
log.Warnf("%v will use network based tag ", err)
cfgNw := mastercfg.CfgNetworkState{}
cfgNw.StateDriver = d.oper.StateDriver
err1 := cfgNw.Read(cfgEp.NetID)
if err1 != nil {
log.Errorf("Unable to get tag neither epg nor nw")
return err1
}
cfgEpGroup.PktTagType = cfgNw.PktTagType
cfgEpGroup.PktTag = cfgNw.PktTag
} else {
return err
}
// Find the switch based on network type
var sw *OvsSwitch
if cfgEpGroup.PktTagType == "vxlan" {
sw = d.switchDb["vxlan"]
} else {
sw = d.switchDb["vlan"]
}
operEp := &OvsOperEndpointState{}
operEp.StateDriver = d.oper.StateDriver
err = operEp.Read(id)
if core.ErrIfKeyExists(err) != nil {
return err
} else if err == nil {
// check if oper state matches cfg state. In case of mismatch cleanup
// up the EP and continue add new one. In case of match just return.
if operEp.Matches(cfgEp) {
log.Printf("Found matching oper state for ep %s, noop", id)
// Ask the switch to update the port
err = sw.UpdatePort(operEp.PortName, cfgEp, cfgEpGroup.PktTag)
if err != nil {
log.Errorf("Error creating port %s. Err: %v", intfName, err)
return err
}
return nil
}
log.Printf("Found mismatching oper state for Ep, cleaning it. Config: %+v, Oper: %+v",
cfgEp, operEp)
d.DeleteEndpoint(operEp.ID)
}
// add an internal ovs port with vlan-tag information from the state
// XXX: revisit, the port name might need to come from user. Also revisit
// the algorithm to take care of port being deleted and reuse unused port
// numbers
d.oper.CurrPortNum++
err = d.oper.Write()
if err != nil {
return err
}
intfName = d.getIntfName()
// Ask the switch to create the port
err = sw.CreatePort(intfName, cfgEp, cfgEpGroup.PktTag)
if err != nil {
log.Errorf("Error creating port %s. Err: %v", intfName, err)
return err
}
// Save the oper state
operEp = &OvsOperEndpointState{
NetID: cfgEp.NetID,
AttachUUID: cfgEp.AttachUUID,
ContName: cfgEp.ContName,
ServiceName: cfgEp.ServiceName,
IPAddress: cfgEp.IPAddress,
MacAddress: cfgEp.MacAddress,
IntfName: cfgEp.IntfName,
PortName: intfName,
HomingHost: cfgEp.HomingHost,
VtepIP: cfgEp.VtepIP}
operEp.StateDriver = d.oper.StateDriver
operEp.ID = id
err = operEp.Write()
if err != nil {
return err
}
defer func() {
if err != nil {
operEp.Clear()
}
}()
return nil
}
// DeleteEndpoint deletes an endpoint by named identifier.
func (d *OvsDriver) DeleteEndpoint(id string) (err error) {
epOper := OvsOperEndpointState{}
epOper.StateDriver = d.oper.StateDriver
err = epOper.Read(id)
if err != nil {
return err
}
defer func() {
epOper.Clear()
}()
// Get the network state
cfgNw := mastercfg.CfgNetworkState{}
cfgNw.StateDriver = d.oper.StateDriver
err = cfgNw.Read(epOper.NetID)
if err != nil {
return err
}
// Find the switch based on network type
var sw *OvsSwitch
if cfgNw.PktTagType == "vxlan" {
sw = d.switchDb["vxlan"]
} else {
sw = d.switchDb["vlan"]
}
err = sw.DeletePort(&epOper)
if err != nil {
log.Errorf("Error deleting endpoint: %+v. Err: %v", epOper, err)
}
return nil
}
// AddPeerHost adds VTEPs if necessary
func (d *OvsDriver) AddPeerHost(node core.ServiceInfo) error {
// Nothing to do if this is our own IP
if node.HostAddr == d.localIP {
return nil
}
log.Infof("CreatePeerHost for %+v", node)
// Add the VTEP for the peer in vxlan switch.
err := d.switchDb["vxlan"].CreateVtep(node.HostAddr)
if err != nil {
log.Errorf("Error adding the VTEP %s. Err: %s", node.HostAddr, err)
return err
}
return nil
}
// DeletePeerHost deletes associated VTEP
func (d *OvsDriver) DeletePeerHost(node core.ServiceInfo) error {
// Nothing to do if this is our own IP
if node.HostAddr == d.localIP {
return nil
}
log.Infof("DeletePeerHost for %+v", node)
// Add the VTEP for the peer in vxlan switch.
err := d.switchDb["vxlan"].DeleteVtep(node.HostAddr)
if err != nil {
log.Errorf("Error deleting the VTEP %s. Err: %s", node.HostAddr, err)
return err
}
return nil
}
// AddMaster adds master node
func (d *OvsDriver) AddMaster(node core.ServiceInfo) error {
log.Infof("AddMaster for %+v", node)
// Add master to vlan and vxlan datapaths
err := d.switchDb["vxlan"].AddMaster(node)
if err != nil {
return err
}
return nil
}
// DeleteMaster deletes master node
func (d *OvsDriver) DeleteMaster(node core.ServiceInfo) error {
log.Infof("DeleteMaster for %+v", node)
// Delete master from vlan and vxlan datapaths
err := d.switchDb["vxlan"].DeleteMaster(node)
if err != nil {
return err
}
return nil
}