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// Copyright (C) 2014 Nippon Telegraph and Telephone Corporation.
//
// 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 table
import (
"fmt"
"github.com/osrg/gobgp/packet"
"github.com/osrg/gobgp/utils"
"net"
)
type Path interface {
String() string
getPathAttributeMap() *utils.OrderedMap
getPathAttribute(int) bgp.PathAttributeInterface
clone(forWithdrawal bool) Path
setRouteFamily(ROUTE_FAMILY RouteFamily)
getRouteFamily() RouteFamily
setSource(source *Peer)
getSource() *Peer
setNexthop(nexthop net.IP)
getNexthop() net.IP
setSourceVerNum(sourceVerNum int)
getSourceVerNum() int
setWithdraw(withdraw bool)
isWithdraw() bool
setNlri(nlri bgp.AddrPrefixInterface)
getNlri() bgp.AddrPrefixInterface
getPrefix() net.IP
setMedSetByTargetNeighbor(medSetByTargetNeighbor bool)
getMedSetByTargetNeighbor() bool
}
type PathDefault struct {
ROUTE_FAMILY RouteFamily
source *Peer
nexthop net.IP
sourceVerNum int
withdraw bool
nlri bgp.AddrPrefixInterface
pattrMap *utils.OrderedMap
medSetByTargetNeighbor bool
}
func NewPathDefault(source *Peer, nlri bgp.AddrPrefixInterface, sourceVerNum int, nexthop net.IP,
isWithdraw bool, pattr *utils.OrderedMap, medSetByTargetNeighbor bool) *PathDefault {
if source == nil {
logger.Error("Need to provide source")
return nil
}
if !isWithdraw && (pattr == nil || nexthop == nil) {
logger.Error("Need to provide nexthop and patattrs for path that is not a withdraw.")
return nil
}
path := &PathDefault{}
path.ROUTE_FAMILY = RF_IPv4_UC
path.pattrMap = utils.NewOrderedMap()
if pattr != nil {
keyList := pattr.KeyLists()
for key := keyList.Front(); key != nil; key = key.Next() {
key := key.Value
val := pattr.Get(key)
e := path.pattrMap.Append(key, val)
if e != nil {
logger.Error(e)
}
}
}
path.nlri = nlri
path.source = source
path.nexthop = nexthop
path.sourceVerNum = sourceVerNum
path.withdraw = isWithdraw
path.medSetByTargetNeighbor = medSetByTargetNeighbor
return path
}
func (pd *PathDefault) setRouteFamily(ROUTE_FAMILY RouteFamily) {
pd.ROUTE_FAMILY = ROUTE_FAMILY
}
func (pd *PathDefault) getRouteFamily() RouteFamily {
return pd.ROUTE_FAMILY
}
func (pd *PathDefault) setSource(source *Peer) {
pd.source = source
}
func (pd *PathDefault) getSource() *Peer {
return pd.source
}
func (pd *PathDefault) setNexthop(nexthop net.IP) {
pd.nexthop = nexthop
}
func (pd *PathDefault) getNexthop() net.IP {
return pd.nexthop
}
func (pd *PathDefault) setSourceVerNum(sourceVerNum int) {
pd.sourceVerNum = sourceVerNum
}
func (pd *PathDefault) getSourceVerNum() int {
return pd.sourceVerNum
}
func (pd *PathDefault) setWithdraw(withdraw bool) {
pd.withdraw = withdraw
}
func (pd *PathDefault) isWithdraw() bool {
return pd.withdraw
}
func (pd *PathDefault) setNlri(nlri bgp.AddrPrefixInterface) {
pd.nlri = nlri
}
func (pd *PathDefault) getNlri() bgp.AddrPrefixInterface {
return pd.nlri
}
func (pd *PathDefault) setMedSetByTargetNeighbor(medSetByTargetNeighbor bool) {
pd.medSetByTargetNeighbor = medSetByTargetNeighbor
}
func (pd *PathDefault) getMedSetByTargetNeighbor() bool {
return pd.medSetByTargetNeighbor
}
//Copy the entity
func (pd *PathDefault) getPathAttributeMap() *utils.OrderedMap {
cpPattr := utils.NewOrderedMap()
keyList := pd.pattrMap.KeyLists()
for key := keyList.Front(); key != nil; key = key.Next() {
key := key.Value
val := pd.pattrMap.Get(key)
e := cpPattr.Append(key, val)
if e != nil {
logger.Error(e)
}
}
return cpPattr
}
func (pd *PathDefault) getPathAttribute(pattrType int) bgp.PathAttributeInterface {
attr := pd.pattrMap.Get(pattrType)
if attr == nil {
logger.Debugf("Attribute Type %s is not found", AttributeType(pattrType))
return nil
}
return attr.(bgp.PathAttributeInterface)
}
func (pi *PathDefault) clone(forWithdrawal bool) Path {
pathAttrs := utils.NewOrderedMap()
if !forWithdrawal {
pathAttrs = pi.getPathAttributeMap()
}
clone := NewPathDefault(pi.getSource(), pi.getNlri(), pi.getSourceVerNum(),
pi.getNexthop(), forWithdrawal, pathAttrs, pi.getMedSetByTargetNeighbor())
return clone
}
// return Path's string representation
func (pi *PathDefault) String() string {
str := fmt.Sprintf("IPv4Path Source: %d, ", pi.getSourceVerNum())
str = str + fmt.Sprintf(" NLRI: %s, ", pi.getPrefix().String())
str = str + fmt.Sprintf(" nexthop: %s, ", pi.getNexthop().String())
str = str + fmt.Sprintf(" withdraw: %s, ", pi.isWithdraw())
str = str + fmt.Sprintf(" path attributes: %s, ", pi.getPathAttributeMap())
return str
}
func (pi *PathDefault) getPrefix() net.IP {
addrPrefix := pi.nlri.(*bgp.NLRInfo)
return addrPrefix.Prefix
}
func getNextHop(pathAttributes []bgp.PathAttributeInterface) net.IP {
for _, pathAttr := range pathAttributes {
switch p := pathAttr.(type) {
case *bgp.PathAttributeNextHop:
return p.Value
}
}
return nil
}
func createPathAttributeMap(pathAttributes []bgp.PathAttributeInterface) *utils.OrderedMap {
pathAttrMap := utils.NewOrderedMap()
for _, attr := range pathAttributes {
var err error
switch a := attr.(type) {
case *bgp.PathAttributeOrigin:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_ORIGIN, a)
case *bgp.PathAttributeAsPath:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_AS_PATH, a)
case *bgp.PathAttributeNextHop:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_NEXT_HOP, a)
case *bgp.PathAttributeMultiExitDisc:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC, a)
case *bgp.PathAttributeLocalPref:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_LOCAL_PREF, a)
case *bgp.PathAttributeAtomicAggregate:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_ATOMIC_AGGREGATE, a)
case *bgp.PathAttributeAggregator:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_AGGREGATOR, a)
case *bgp.PathAttributeCommunities:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_COMMUNITIES, a)
case *bgp.PathAttributeOriginatorId:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_ORIGINATOR_ID, a)
case *bgp.PathAttributeClusterList:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_CLUSTER_LIST, a)
case *bgp.PathAttributeMpReachNLRI:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI, a)
case *bgp.PathAttributeMpUnreachNLRI:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_MP_UNREACH_NLRI, a)
case *bgp.PathAttributeExtendedCommunities:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_EXTENDED_COMMUNITIES, a)
case *bgp.PathAttributeAs4Path:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_AS4_PATH, a)
case *bgp.PathAttributeAs4Aggregator:
err = pathAttrMap.Append(bgp.BGP_ATTR_TYPE_AS4_AGGREGATOR, a)
}
if err != nil {
return nil
}
}
return pathAttrMap
}
// create Path object based on route family
func CreatePath(source *Peer, nlri bgp.AddrPrefixInterface,
pathAttributes []bgp.PathAttributeInterface, isWithdraw bool) Path {
rf := RouteFamily(int(nlri.AFI())<<16 | int(nlri.SAFI()))
logger.Debugf("afi: %d, safi: %d ", int(nlri.AFI()), nlri.SAFI())
pathAttrMap := createPathAttributeMap(pathAttributes)
var path Path
switch rf {
case RF_IPv4_UC:
logger.Debugf("RouteFamily : %s", RF_IPv4_UC.String())
nexthop := getNextHop(pathAttributes)
path = NewIPv4Path(source, nlri, source.VersionNum, nexthop, isWithdraw, pathAttrMap, false)
case RF_IPv6_UC:
logger.Debugf("RouteFamily : %s", RF_IPv6_UC.String())
var mpattr *bgp.PathAttributeMpReachNLRI
var nexthop net.IP
if !isWithdraw {
mpattr = pathAttrMap.Get(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI).(*bgp.PathAttributeMpReachNLRI)
nexthop = mpattr.Nexthop
} else {
nexthop = nil
}
path = NewIPv6Path(source, nlri, source.VersionNum, nexthop, isWithdraw, pathAttrMap, false)
}
return path
}
/*
* Definition of inherited Path interface
*/
type IPv4Path struct {
*PathDefault
}
func NewIPv4Path(source *Peer, nlri bgp.AddrPrefixInterface, sourceVerNum int, nexthop net.IP,
isWithdraw bool, pattr *utils.OrderedMap, medSetByTargetNeighbor bool) *IPv4Path {
ipv4Path := &IPv4Path{}
ipv4Path.PathDefault = NewPathDefault(source, nlri, sourceVerNum, nexthop, isWithdraw, pattr, medSetByTargetNeighbor)
ipv4Path.PathDefault.ROUTE_FAMILY = RF_IPv4_UC
return ipv4Path
}
func (ipv4p *IPv4Path) setPathDefault(pd *PathDefault) {
ipv4p.PathDefault = pd
}
func (ipv4p *IPv4Path) getPathDefault() *PathDefault {
return ipv4p.PathDefault
}
type IPv6Path struct {
*PathDefault
}
func NewIPv6Path(source *Peer, nlri bgp.AddrPrefixInterface, sourceVerNum int, nexthop net.IP,
isWithdraw bool, pattr *utils.OrderedMap, medSetByTargetNeighbor bool) *IPv6Path {
ipv6Path := &IPv6Path{}
ipv6Path.PathDefault = NewPathDefault(source, nlri, sourceVerNum, nexthop, isWithdraw, pattr, medSetByTargetNeighbor)
ipv6Path.PathDefault.ROUTE_FAMILY = RF_IPv6_UC
return ipv6Path
}
func (ipv6p *IPv6Path) setPathDefault(pd *PathDefault) {
ipv6p.PathDefault = pd
}
func (ipv6p *IPv6Path) getPathDefault() *PathDefault {
return ipv6p.PathDefault
}
func (ipv6p *IPv6Path) getPrefix() net.IP {
addrPrefix := ipv6p.nlri.(*bgp.IPv6AddrPrefix)
return addrPrefix.Prefix
}
// return IPv6Path's string representation
func (ipv6p *IPv6Path) String() string {
str := fmt.Sprintf("IPv6Path Source: %d, ", ipv6p.getSourceVerNum())
str = str + fmt.Sprintf(" NLRI: %s, ", ipv6p.getPrefix().String())
str = str + fmt.Sprintf(" nexthop: %s, ", ipv6p.getNexthop().String())
str = str + fmt.Sprintf(" withdraw: %s, ", ipv6p.isWithdraw())
str = str + fmt.Sprintf(" path attributes: %s, ", ipv6p.getPathAttributeMap())
return str
}
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