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bfd_config.go
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bfd_config.go
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// Copyright (c) 2017 Cisco and/or its affiliates.
//
// 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 ifplugin is the implementation of the Interface plugin.deps.
package ifplugin
//go:generate protoc --proto_path=model/bfd --gogo_out=model/bfd model/bfd/bfd.proto
import (
"fmt"
"net"
govppapi "git.fd.io/govpp.git/api"
log "github.com/ligato/cn-infra/logging/logrus"
"github.com/ligato/cn-infra/servicelabel"
"github.com/ligato/cn-infra/utils/safeclose"
"github.com/ligato/vpp-agent/idxvpp"
bfd_api "github.com/ligato/vpp-agent/plugins/defaultplugins/ifplugin/bin_api/bfd"
"github.com/ligato/vpp-agent/plugins/defaultplugins/ifplugin/ifaceidx"
"github.com/ligato/vpp-agent/plugins/defaultplugins/ifplugin/model/bfd"
"github.com/ligato/vpp-agent/plugins/defaultplugins/ifplugin/vppcalls"
"github.com/ligato/vpp-agent/plugins/govppmux"
"strconv"
)
// BFDConfigurator runs in the background in its own goroutine where it watches for any changes
// in the configuration of interfaces as modelled by the proto file "../model/bfd/bfd.proto"
// and stored in ETCD under the key "/vnf-agent/{agent-label}/vpp/config/v1/bfd/".
// Updates received from the northbound API are compared with the VPP run-time configuration and differences
// are applied through the VPP binary API.
type BFDConfigurator struct {
GoVppmux govppmux.API
SwIfIndexes ifaceidx.SwIfIndex
ServiceLabel servicelabel.ReaderAPI
BfdIDSeq uint32
// Base mappings
bfdSessionsIndexes idxvpp.NameToIdxRW
bfdKeysIndexes idxvpp.NameToIdxRW
bfdEchoFunctionIndex idxvpp.NameToIdxRW
// Auxiliary mappings
bfdRemovedAuthIndex idxvpp.NameToIdxRW
vppChannel *govppapi.Channel
}
// Init members and channels
func (plugin *BFDConfigurator) Init(bfdSessionIndexes idxvpp.NameToIdxRW, bfdKeyIndexes idxvpp.NameToIdxRW, bfdEchoFunctionIndex idxvpp.NameToIdxRW,
bfdRemovedAuthIndex idxvpp.NameToIdxRW) (err error) {
log.DefaultLogger().WithField("vppLabel", plugin.ServiceLabel).Debug("Initializing BFD configurator")
plugin.bfdSessionsIndexes = bfdSessionIndexes
plugin.bfdKeysIndexes = bfdKeyIndexes
plugin.bfdEchoFunctionIndex = bfdEchoFunctionIndex
plugin.bfdRemovedAuthIndex = bfdRemovedAuthIndex
plugin.vppChannel, err = plugin.GoVppmux.NewAPIChannel()
if err != nil {
return err
}
err = vppcalls.CheckMsgCompatibilityForBfd(plugin.vppChannel)
if err != nil {
return err
}
return nil
}
// Close GOVPP channel
func (plugin *BFDConfigurator) Close() error {
return safeclose.Close(plugin.vppChannel)
}
// ConfigureBfdSession configures bfd session (including authentication if exists). Provided interface has to contain
// ip address defined in BFD as source
func (plugin *BFDConfigurator) ConfigureBfdSession(bfdInput *bfd.SingleHopBFD_Session) error {
log.DefaultLogger().Print("Configuring BFD session for interface ", bfdInput.Interface)
// Verify interface presence
_, _, found := plugin.SwIfIndexes.LookupIdx(bfdInput.Interface)
if !found {
return fmt.Errorf("Interface %v does not exist", bfdInput.Interface)
}
// Check source ip address
res := plugin.SwIfIndexes.LookupNameByIP(bfdInput.SourceAddress)
if len(res) != 1 || res[0] != bfdInput.Interface {
return fmt.Errorf("BFD source address %v does not match any of provided interface's ip adresses", bfdInput.SourceAddress)
}
// Call vpp api
err := vppcalls.AddBfdUDPSession(bfdInput, plugin.SwIfIndexes, plugin.bfdKeysIndexes, plugin.vppChannel)
if err != nil {
return fmt.Errorf("Error while configuring BFD for interface %v", bfdInput.Interface)
}
plugin.bfdSessionsIndexes.RegisterName(bfdInput.Interface, plugin.BfdIDSeq, nil)
log.DefaultLogger().Debugf("BFD session with interface %v registered. Idx: %v", bfdInput.Interface, plugin.BfdIDSeq)
plugin.BfdIDSeq++
log.DefaultLogger().Printf("BFD session for interface %v configured ", bfdInput.Interface)
return nil
}
// ModifyBfdSession modifies BFD session fields. Source and destination IP address for old and new config has to be the
// same. Authentication is NOT changed here, BFD modify bin api call does not support that
func (plugin *BFDConfigurator) ModifyBfdSession(oldBfdSession *bfd.SingleHopBFD_Session, newBfdSession *bfd.SingleHopBFD_Session) error {
log.DefaultLogger().Print("Modifying BFD session for interface ")
// Verify interface presence
_, _, found := plugin.SwIfIndexes.LookupIdx(newBfdSession.Interface)
if !found {
return fmt.Errorf("Interface %v does not exist", newBfdSession.Interface)
}
// Check source ip address
res := plugin.SwIfIndexes.LookupNameByIP(newBfdSession.SourceAddress)
if len(res) == 1 && res[0] == newBfdSession.Interface {
return fmt.Errorf("BFD source address %v does not match any of provided interface's ip adresses", newBfdSession.SourceAddress)
}
// Find old BFD session
_, _, found = plugin.bfdSessionsIndexes.LookupIdx(oldBfdSession.Interface)
if !found {
log.DefaultLogger().Printf("Previous BFD session does not exist, creating a new one for interface %v", newBfdSession.Interface)
err := plugin.ConfigureBfdSession(newBfdSession)
if err != nil {
return fmt.Errorf("Error while creating BFD for interface %v", newBfdSession.Interface)
}
} else {
// Compare source and destination addresses which cannot change if BFD session is modified
if oldBfdSession.SourceAddress != newBfdSession.SourceAddress || oldBfdSession.DestinationAddress != newBfdSession.DestinationAddress {
return fmt.Errorf("BFD adresses does not match. Odl session source: %v, dest: %v, new session source: %v, dest: %v",
oldBfdSession.SourceAddress, oldBfdSession.DestinationAddress, newBfdSession.SourceAddress, newBfdSession.DestinationAddress)
}
err := vppcalls.ModifyBfdUDPSession(newBfdSession, plugin.SwIfIndexes, plugin.vppChannel)
if err != nil {
return fmt.Errorf("Error while updating BFD for interface %v", newBfdSession.Interface)
}
}
return nil
}
// DeleteBfdSession removes BFD session
func (plugin *BFDConfigurator) DeleteBfdSession(bfdInput *bfd.SingleHopBFD_Session) error {
log.DefaultLogger().Print("Deleting BFD session")
ifIndex, _, found := plugin.SwIfIndexes.LookupIdx(bfdInput.Interface)
if !found {
return nil
}
err := vppcalls.DeleteBfdUDPSession(ifIndex, bfdInput.SourceAddress, bfdInput.DestinationAddress, plugin.vppChannel)
if err != nil {
return fmt.Errorf("Error while deleting BFD for interface %v", bfdInput.Interface)
}
plugin.bfdSessionsIndexes.UnregisterName(bfdInput.Interface)
log.DefaultLogger().Debugf("BFD session with interface %v unregistered", bfdInput.Interface)
return nil
}
// ConfigureBfdAuthKey crates new authentication key which can be used for BFD session
func (plugin *BFDConfigurator) ConfigureBfdAuthKey(bfdAuthKey *bfd.SingleHopBFD_Key) error {
log.DefaultLogger().Print("Setting up BFD authentication key with ID ", bfdAuthKey.Id)
// Check whether this auth key was not recreated
authKeyIndex := strconv.FormatUint(uint64(bfdAuthKey.Id), 10)
_, _, found := plugin.bfdRemovedAuthIndex.LookupIdx(authKeyIndex)
if found {
plugin.bfdRemovedAuthIndex.UnregisterName(authKeyIndex)
log.DefaultLogger().Debugf("Authentication key with ID %v recreated", authKeyIndex)
plugin.ModifyBfdAuthKey(bfdAuthKey, bfdAuthKey)
}
err := vppcalls.SetBfdUDPAuthenticationKey(bfdAuthKey, plugin.vppChannel)
if err != nil {
return fmt.Errorf("Error while setting up BFD auth key with ID %v", bfdAuthKey.Id)
}
authKeyIDAsString := strconv.FormatUint(uint64(bfdAuthKey.Id), 10)
plugin.bfdKeysIndexes.RegisterName(authKeyIDAsString, plugin.BfdIDSeq, nil)
log.DefaultLogger().Debugf("BFD authentication key with id %v registered. Idx: %v", bfdAuthKey.Id, plugin.BfdIDSeq)
plugin.BfdIDSeq++
return nil
}
// ModifyBfdAuthKey modifies auth key fields. Key which is assigned to one or more BFD session cannot be modified
func (plugin *BFDConfigurator) ModifyBfdAuthKey(oldInput *bfd.SingleHopBFD_Key, newInput *bfd.SingleHopBFD_Key) error {
log.DefaultLogger().Print("Modifying BFD auth key for ID ", oldInput.Id)
// Check whether this auth key was not recreated
authKeyIndex := strconv.FormatUint(uint64(oldInput.Id), 10)
_, _, found := plugin.bfdRemovedAuthIndex.LookupIdx(authKeyIndex)
if found {
plugin.bfdRemovedAuthIndex.UnregisterName(authKeyIndex)
log.DefaultLogger().Debugf("Authentication key with ID %v recreated", oldInput.Id)
}
// Check that this auth key is not used in any session
sessionList, err := vppcalls.DumpBfdUDPSessionsWithID(newInput.Id, plugin.SwIfIndexes, plugin.bfdSessionsIndexes, plugin.vppChannel)
if err != nil {
return fmt.Errorf("Error while verifying authentication key usage. Id: %v", oldInput.Id)
}
if len(sessionList) != 0 {
// Authentication Key is used and cannot be removed directly
for _, bfds := range sessionList {
sourceAddr := net.HardwareAddr(bfds.LocalAddr).String()
destAddr := net.HardwareAddr(bfds.PeerAddr).String()
err := vppcalls.DeleteBfdUDPSession(bfds.SwIfIndex, sourceAddr, destAddr, plugin.vppChannel)
if err != nil {
return err
}
}
log.DefaultLogger().Debugf("%v session(s) temporary removed", len(sessionList))
}
err = vppcalls.DeleteBfdUDPAuthenticationKey(oldInput, plugin.vppChannel)
if err != nil {
return fmt.Errorf("Error while removing BFD auth key with ID %v", oldInput.Id)
}
err = vppcalls.SetBfdUDPAuthenticationKey(newInput, plugin.vppChannel)
if err != nil {
return fmt.Errorf("Error while setting up BFD auth key with ID %v", oldInput.Id)
}
plugin.LookupBfdKeys()
// Recreate BFD sessions if necessary
if len(sessionList) != 0 {
for _, bfdSession := range sessionList {
err := vppcalls.AddBfdUDPSessionFromDetails(bfdSession, plugin.bfdKeysIndexes, plugin.vppChannel)
if err != nil {
return err
}
}
log.DefaultLogger().Debugf("%v session(s) recreated", len(sessionList))
}
return nil
}
// DeleteBfdAuthKey removes BFD authentication key but only if it is not used in any BFD session
func (plugin *BFDConfigurator) DeleteBfdAuthKey(bfdInput *bfd.SingleHopBFD_Key) error {
log.DefaultLogger().Print("Deleting BFD auth key")
// Check that this auth key is not used in any session
sessionList, err := vppcalls.DumpBfdUDPSessionsWithID(bfdInput.Id, plugin.SwIfIndexes, plugin.bfdSessionsIndexes, plugin.vppChannel)
if err != nil {
return fmt.Errorf("Error while verifying authentication key usage. Id: %v", bfdInput.Id)
}
if len(sessionList) != 0 {
// Authentication Key is used and cannot be removed directly
for _, bfds := range sessionList {
sourceAddr := net.IP(bfds.LocalAddr[0:4]).String()
destAddr := net.IP(bfds.PeerAddr[0:4]).String()
err := vppcalls.DeleteBfdUDPSession(bfds.SwIfIndex, sourceAddr, destAddr, plugin.vppChannel)
if err != nil {
return err
}
}
log.DefaultLogger().Debugf("%v session(s) temporary removed", len(sessionList))
}
err = vppcalls.DeleteBfdUDPAuthenticationKey(bfdInput, plugin.vppChannel)
if err != nil {
return fmt.Errorf("Error while removing BFD auth key with ID %v", bfdInput.Id)
}
authKeyIDAsString := strconv.FormatUint(uint64(bfdInput.Id), 10)
plugin.bfdKeysIndexes.UnregisterName(authKeyIDAsString)
log.DefaultLogger().Debugf("BFD authentication key with id %v unregistered", bfdInput.Id)
// Recreate BFD sessions if necessary
if len(sessionList) != 0 {
for _, bfdSession := range sessionList {
err := vppcalls.AddBfdUDPSessionFromDetails(bfdSession, plugin.bfdKeysIndexes, plugin.vppChannel)
if err != nil {
return err
}
}
log.DefaultLogger().Debugf("%v session(s) recreated", len(sessionList))
}
return nil
}
// ConfigureBfdEchoFunction is used to setup BFD Echo function on existing interface
func (plugin *BFDConfigurator) ConfigureBfdEchoFunction(bfdInput *bfd.SingleHopBFD_EchoFunction) error {
log.DefaultLogger().Print("Configuring BFD echo function for source interface ", bfdInput.EchoSourceInterface)
// Verify interface presence
_, _, found := plugin.SwIfIndexes.LookupIdx(bfdInput.EchoSourceInterface)
if !found {
return fmt.Errorf("Interface %v does not exist", bfdInput.EchoSourceInterface)
}
err := vppcalls.AddBfdEchoFunction(bfdInput, plugin.SwIfIndexes, plugin.vppChannel)
if err != nil {
return fmt.Errorf("Error while setting up BFD echo source with interface %v", bfdInput.EchoSourceInterface)
}
plugin.bfdEchoFunctionIndex.RegisterName(bfdInput.EchoSourceInterface, plugin.BfdIDSeq, nil)
log.DefaultLogger().Debugf("BFD echo function with interface %v registered. Idx: %v", bfdInput.EchoSourceInterface, plugin.BfdIDSeq)
plugin.BfdIDSeq++
return nil
}
// ModifyBfdEchoFunction handles echo function changes
func (plugin *BFDConfigurator) ModifyBfdEchoFunction(oldInput *bfd.SingleHopBFD_EchoFunction, newInput *bfd.SingleHopBFD_EchoFunction) error {
log.DefaultLogger().Debug("There is nothing to modify for BFD echo function")
// NO-OP
return nil
}
// DeleteBfdEchoFunction removes BFD echo function
func (plugin *BFDConfigurator) DeleteBfdEchoFunction(bfdInput *bfd.SingleHopBFD_EchoFunction) error {
log.DefaultLogger().Print("Deleting BFD echo function")
err := vppcalls.DeleteBfdEchoFunction(plugin.vppChannel)
if err != nil {
return fmt.Errorf("Error while removing BFD echo source with interface %v", bfdInput.EchoSourceInterface)
}
plugin.bfdEchoFunctionIndex.UnregisterName(bfdInput.EchoSourceInterface)
log.DefaultLogger().Debugf("BFD echo function with interface %v unregistered", bfdInput.EchoSourceInterface)
return nil
}
// LookupBfdSessions looks up all BFD sessions and saves their name-to-index mapping
func (plugin *BFDConfigurator) LookupBfdSessions() error {
req := &bfd_api.BfdUDPSessionDump{}
reqCtx := plugin.vppChannel.SendMultiRequest(req)
for {
msg := &bfd_api.BfdUDPSessionDetails{}
stop, err := reqCtx.ReceiveReply(msg)
if stop {
break
}
if err != nil {
return err
}
// Store the name to index mapping if it does not exist yet
name, _, found := plugin.SwIfIndexes.LookupName(msg.SwIfIndex)
if !found {
continue
}
_, _, found = plugin.bfdSessionsIndexes.LookupIdx(name)
if !found {
plugin.bfdEchoFunctionIndex.RegisterName(name, plugin.BfdIDSeq, nil)
log.DefaultLogger().Debugf("BFD session with interface registered. Idx: %v", plugin.BfdIDSeq)
plugin.BfdIDSeq++
}
}
return nil
}
// LookupBfdKeys looks up all BFD auth keys and saves their name-to-index mapping
func (plugin *BFDConfigurator) LookupBfdKeys() error {
req := &bfd_api.BfdAuthKeysDump{}
reqCtx := plugin.vppChannel.SendMultiRequest(req)
for {
msg := &bfd_api.BfdAuthKeysDetails{}
stop, err := reqCtx.ReceiveReply(msg)
if stop {
break
}
if err != nil {
return err
}
// Store the name to index mapping if it does not exist yet
keyID := strconv.FormatUint(uint64(msg.ConfKeyID), 10)
_, _, found := plugin.bfdKeysIndexes.LookupIdx(keyID)
if !found {
plugin.bfdEchoFunctionIndex.RegisterName(keyID, plugin.BfdIDSeq, nil)
log.DefaultLogger().Debugf("BFD authentication key registered. Idx: %v", plugin.BfdIDSeq)
plugin.BfdIDSeq++
}
}
return nil
}