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ovsSwitch.go
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ovsSwitch.go
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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 (
"fmt"
"net"
"strings"
"time"
"github.com/contiv/netplugin/netutils"
"github.com/contiv/ofnet"
log "github.com/Sirupsen/logrus"
)
// OvsSwitch represents on OVS bridge instance
type OvsSwitch struct {
bridgeName string
netType string
ovsdbDriver *OvsdbDriver
ofnetAgent *ofnet.OfnetAgent
ofnetMaster *ofnet.OfnetMaster
}
// NewOvsSwitch Creates a new OVS switch instance
func NewOvsSwitch(bridgeName, netType, localIP string) (*OvsSwitch, error) {
var err error
sw := new(OvsSwitch)
sw.bridgeName = bridgeName
sw.netType = netType
// Determine the failure mode
failMode := ""
if netType == "vxlan" {
failMode = "secure"
}
// Create OVS db driver
sw.ovsdbDriver, err = NewOvsdbDriver(bridgeName, failMode)
if err != nil {
log.Fatalf("Error creating ovsdb driver. Err: %v", err)
}
// For Vxlan, initialize ofnet. For VLAN mode, we use OVS normal forwarding
if netType == "vxlan" {
// Create ofnet master
// FIXME: Move ofnet master to netmaster.
sw.ofnetMaster = ofnet.NewOfnetMaster(ofnet.OFNET_MASTER_PORT)
if sw.ofnetMaster == nil {
log.Fatalf("Error creating ofnet master")
}
// Create an ofnet agent
sw.ofnetAgent, err = ofnet.NewOfnetAgent("vxlan", net.ParseIP(localIP),
ofnet.OFNET_AGENT_PORT, 6633)
if err != nil {
log.Fatalf("Error initializing ofnet")
return nil, err
}
// Add controller to the OVS
ctrlerIP := "127.0.0.1"
ctrlerPort := uint16(6633)
target := fmt.Sprintf("tcp:%s:%d", ctrlerIP, ctrlerPort)
if !sw.ovsdbDriver.IsControllerPresent(target) {
err = sw.ovsdbDriver.AddController(ctrlerIP, ctrlerPort)
if err != nil {
log.Fatalf("Error adding controller to OVS. Err: %v", err)
return nil, err
}
}
// Wait a little for master to be ready before we connect
time.Sleep(300 * time.Millisecond)
// Let local ofnet agent connect to local master too.
var resp bool
masterInfo := ofnet.OfnetNode{
HostAddr: localIP,
HostPort: ofnet.OFNET_MASTER_PORT,
}
err = sw.ofnetAgent.AddMaster(&masterInfo, &resp)
if err != nil {
log.Errorf("Error adding %s as ofnet master. Err: %v", localIP, err)
}
log.Infof("Waiting for OVS switch to connect..")
// Wait for a while for OVS switch to connect to ofnet agent
for i := 0; i < 10; i++ {
time.Sleep(1 * time.Second)
if sw.ofnetAgent.IsSwitchConnected() {
break
}
}
log.Infof("Switch connected.")
}
return sw, nil
}
// Delete performs cleanup prior to destruction of the OvsDriver
func (sw *OvsSwitch) Delete() {
if sw.ofnetAgent != nil {
sw.ofnetAgent.Delete()
}
if sw.ofnetMaster != nil {
sw.ofnetMaster.Delete()
}
if sw.ovsdbDriver != nil {
sw.ovsdbDriver.Delete()
// Wait a little for OVS switch to be deleted
time.Sleep(300 * time.Millisecond)
}
}
// CreateNetwork creates a new network/vlan
func (sw *OvsSwitch) CreateNetwork(pktTag uint16, extPktTag uint32) error {
if sw.netType == "vxlan" {
// Add the vlan/vni to ofnet
err := sw.ofnetAgent.AddVlan(pktTag, extPktTag)
if err != nil {
log.Errorf("Error adding vlan/vni %d/%d. Err: %v", pktTag, extPktTag, err)
return err
}
}
return nil
}
// DeleteNetwork deletes a network/vlan
func (sw *OvsSwitch) DeleteNetwork(pktTag uint16, extPktTag uint32) error {
if sw.netType == "vxlan" {
// Delete vlan/vni mapping
err := sw.ofnetAgent.RemoveVlan(pktTag, extPktTag)
if err != nil {
log.Errorf("Error removing vlan/vni %d/%d. Err: %v", pktTag, extPktTag, err)
return err
}
}
return nil
}
// CreatePort creates a port in ovs switch
func (sw *OvsSwitch) CreatePort(intfName, intfType string, cfgEp *OvsCfgEndpointState,
pktTag int) error {
// Ask OVSDB driver to add/delete the port
err := sw.ovsdbDriver.CreatePort(intfName, intfType, cfgEp.ID, pktTag)
if err != nil {
return err
}
defer func() {
if err != nil {
sw.ovsdbDriver.DeletePort(intfName)
}
}()
// Wait a little for OVS to create the interface
time.Sleep(300 * time.Millisecond)
if intfType != "internal" {
log.Fatalf("Not expecting interface type :%s.", intfType)
}
// Set the interface mac address
err = netutils.SetInterfaceMac(intfName, cfgEp.MacAddress)
if err != nil {
log.Errorf("Error setting interface Mac %s on port %s", cfgEp.MacAddress, intfName)
return err
}
// Add the endpoint to ofnet
if sw.netType == "vxlan" {
// Get the openflow port number for the interface
ofpPort, err := sw.ovsdbDriver.GetOfpPortNo(intfName)
if err != nil {
log.Errorf("Could not find the OVS port %s. Err: %v", intfName, err)
return err
}
macAddr, _ := net.ParseMAC(cfgEp.MacAddress)
// Build the endpoint info
endpoint := ofnet.EndpointInfo{
PortNo: ofpPort,
MacAddr: macAddr,
Vlan: uint16(pktTag),
IpAddr: net.ParseIP(cfgEp.IPAddress),
}
// Add the local port to ofnet
err = sw.ofnetAgent.AddLocalEndpoint(endpoint)
if err != nil {
log.Errorf("Error adding local port %s to ofnet. Err: %v", intfName, err)
return err
}
}
return nil
}
// UpdatePort updates an OVS port without creating it
func (sw *OvsSwitch) UpdatePort(intfName string, cfgEp *OvsCfgEndpointState, pktTag int) error {
// Add the endpoint to ofnet
if sw.netType == "vxlan" {
// Get the openflow port number for the interface
ofpPort, err := sw.ovsdbDriver.GetOfpPortNo(intfName)
if err != nil {
log.Errorf("Could not find the OVS port %s. Err: %v", intfName, err)
return err
}
macAddr, _ := net.ParseMAC(cfgEp.MacAddress)
// Build the endpoint info
endpoint := ofnet.EndpointInfo{
PortNo: ofpPort,
MacAddr: macAddr,
Vlan: uint16(pktTag),
IpAddr: net.ParseIP(cfgEp.IPAddress),
}
// Add the local port to ofnet
err = sw.ofnetAgent.AddLocalEndpoint(endpoint)
if err != nil {
log.Errorf("Error adding local port %s to ofnet. Err: %v", intfName, err)
return err
}
}
return nil
}
// DeletePort removes a port from OVS
func (sw *OvsSwitch) DeletePort(epOper *OvsOperEndpointState) error {
if epOper.VtepIP != "" {
return nil
}
intfName, err := sw.ovsdbDriver.GetPortOrIntfNameFromID(epOper.ID, getIntfName)
if err != nil {
return err
}
// Remove info from ofnet
if sw.netType == "vxlan" {
// Get the openflow port number for the interface
ofpPort, err := sw.ovsdbDriver.GetOfpPortNo(intfName)
if err != nil {
log.Errorf("Could not find the OVS port %s. Err: %v", intfName, err)
return err
}
err = sw.ofnetAgent.RemoveLocalEndpoint(ofpPort)
if err != nil {
log.Errorf("Error removing port %s from ofnet. Err: %v", intfName, err)
}
}
// Delete it from ovsdb
err = sw.ovsdbDriver.DeletePort(intfName)
if err != nil {
return err
}
return nil
}
// vxlanIfName returns formatted vxlan interface name
func vxlanIfName(vtepIP string) string {
return fmt.Sprintf(vxlanIfNameFmt, strings.Replace(vtepIP, ".", "", -1))
}
// CreateVtep creates a VTEP interface
func (sw *OvsSwitch) CreateVtep(vtepIP string) error {
// Create interface name for VTEP
intfName := vxlanIfName(vtepIP)
log.Infof("Creating VTEP intf %s for IP %s", intfName, vtepIP)
// Check if it already exists
isPresent, vsifName := sw.ovsdbDriver.IsVtepPresent(vtepIP)
if !isPresent || (vsifName != intfName) {
// Ask ovsdb to create it
err := sw.ovsdbDriver.CreateVtep(intfName, vtepIP)
if err != nil {
log.Errorf("Error creating VTEP port %s. Err: %v", intfName, err)
}
}
// Wait a little for OVS to create the interface
time.Sleep(300 * time.Millisecond)
// Get the openflow port number for the interface
ofpPort, err := sw.ovsdbDriver.GetOfpPortNo(intfName)
if err != nil {
log.Errorf("Could not find the OVS port %s. Err: %v", intfName, err)
return err
}
// Add info about VTEP port to ofnet
err = sw.ofnetAgent.AddVtepPort(ofpPort, net.ParseIP(vtepIP))
if err != nil {
log.Errorf("Error adding VTEP port %s to ofnet. Err: %v", intfName, err)
return err
}
// Add each of the peers as ofnet masters.
// This essentially forms full mesh connectivity today.
// FIXME: Move ofnet master to netmaster.
var resp bool
masterInfo := ofnet.OfnetNode{
HostAddr: vtepIP,
HostPort: ofnet.OFNET_MASTER_PORT,
}
err = sw.ofnetAgent.AddMaster(&masterInfo, &resp)
if err != nil {
log.Errorf("Error adding %s as ofnet master. Err: %v", vtepIP, err)
return err
}
return nil
}
// DeleteVtep deletes a VTEP
func (sw *OvsSwitch) DeleteVtep(vtepIP string) error {
// Build vtep interface name
intfName := vxlanIfName(vtepIP)
log.Infof("Deleting VTEP intf %s for IP %s", intfName, vtepIP)
// Get the openflow port number for the interface
ofpPort, err := sw.ovsdbDriver.GetOfpPortNo(intfName)
if err != nil {
log.Errorf("Could not find the OVS port %s. Err: %v", intfName, err)
return err
}
// Add info about VTEP port to ofnet
err = sw.ofnetAgent.RemoveVtepPort(ofpPort, net.ParseIP(vtepIP))
if err != nil {
log.Errorf("Error deleting VTEP port %s to ofnet. Err: %v", intfName, err)
return err
}
// ask ovsdb to delete the VTEP
return sw.ovsdbDriver.DeleteVtep(intfName)
}
// AddUplinkPort adds uplink port to the OVS
func (sw *OvsSwitch) AddUplinkPort(intfName string) error {
var err error
// some error checking
if sw.netType != "vlan" {
log.Fatalf("Can not add uplink to OVS type %s.", sw.netType)
}
uplinkID := "uplink" + intfName
// Check if port is already part of the OVS and add it
if !sw.ovsdbDriver.IsPortNamePresent(intfName) {
// Ask OVSDB driver to add the port as a trunk port
err = sw.ovsdbDriver.CreatePort(intfName, "", uplinkID, 0)
if err != nil {
log.Errorf("Error adding uplink %s to OVS. Err: %v", intfName, err)
return err
}
}
log.Infof("Added uplink %s to OVS switch %s.", intfName, sw.bridgeName)
defer func() {
if err != nil {
sw.ovsdbDriver.DeletePort(intfName)
}
}()
return nil
}