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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 (
"encoding/json"
"fmt"
log "github.com/Sirupsen/logrus"
"github.com/osrg/gobgp/packet"
"net"
"reflect"
"time"
)
type Path interface {
String() string
getPathAttrs() []bgp.PathAttributeInterface
getPathAttr(bgp.BGPAttrType) (int, bgp.PathAttributeInterface)
GetRouteFamily() bgp.RouteFamily
setSource(source *PeerInfo)
getSource() *PeerInfo
setNexthop(nexthop net.IP)
getNexthop() net.IP
setWithdraw(withdraw bool)
IsWithdraw() bool
getNlri() bgp.AddrPrefixInterface
getPrefix() string
setMedSetByTargetNeighbor(medSetByTargetNeighbor bool)
getMedSetByTargetNeighbor() bool
clone(IsWithdraw bool) Path
MarshalJSON() ([]byte, error)
}
type PathDefault struct {
routeFamily bgp.RouteFamily
source *PeerInfo
nexthop net.IP
withdraw bool
nlri bgp.AddrPrefixInterface
pathAttrs []bgp.PathAttributeInterface
medSetByTargetNeighbor bool
timestamp time.Time
}
func NewPathDefault(rf bgp.RouteFamily, source *PeerInfo, nlri bgp.AddrPrefixInterface, nexthop net.IP, isWithdraw bool, pattrs []bgp.PathAttributeInterface, medSetByTargetNeighbor bool, now time.Time) *PathDefault {
if !isWithdraw && pattrs == nil {
log.Error("Need to provide nexthop and patattrs for path that is not a withdraw.")
return nil
}
path := &PathDefault{}
path.routeFamily = rf
path.pathAttrs = pattrs
path.nlri = nlri
path.source = source
path.nexthop = nexthop
path.withdraw = isWithdraw
path.medSetByTargetNeighbor = medSetByTargetNeighbor
path.timestamp = now
return path
}
func (pd *PathDefault) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
Network string
Nexthop string
Attrs []bgp.PathAttributeInterface
Time float64
}{
Network: pd.getPrefix(),
Nexthop: pd.nexthop.String(),
Attrs: pd.getPathAttrs(),
Time: time.Now().Sub(pd.timestamp).Seconds(),
})
}
// create new PathAttributes
func (pd *PathDefault) clone(isWithdraw bool) Path {
nlri := pd.nlri
if isWithdraw {
if pd.IsWithdraw() {
log.Fatal("Withdraw path is not supposed to be cloned")
} else {
nlri = &bgp.WithdrawnRoute{pd.nlri.(*bgp.NLRInfo).IPAddrPrefix}
}
}
return CreatePath(pd.source, nlri, pd.pathAttrs, isWithdraw, pd.timestamp)
}
func (pd *PathDefault) GetRouteFamily() bgp.RouteFamily {
return pd.routeFamily
}
func (pd *PathDefault) setSource(source *PeerInfo) {
pd.source = source
}
func (pd *PathDefault) getSource() *PeerInfo {
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) setWithdraw(withdraw bool) {
pd.withdraw = withdraw
}
func (pd *PathDefault) IsWithdraw() bool {
return pd.withdraw
}
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
}
func (pd *PathDefault) getPathAttrs() []bgp.PathAttributeInterface {
return pd.pathAttrs
}
func (pd *PathDefault) getPathAttr(pattrType bgp.BGPAttrType) (int, bgp.PathAttributeInterface) {
attrMap := [bgp.BGP_ATTR_TYPE_AS4_AGGREGATOR + 1]reflect.Type{}
attrMap[bgp.BGP_ATTR_TYPE_ORIGIN] = reflect.TypeOf(&bgp.PathAttributeOrigin{})
attrMap[bgp.BGP_ATTR_TYPE_AS_PATH] = reflect.TypeOf(&bgp.PathAttributeAsPath{})
attrMap[bgp.BGP_ATTR_TYPE_NEXT_HOP] = reflect.TypeOf(&bgp.PathAttributeNextHop{})
attrMap[bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC] = reflect.TypeOf(&bgp.PathAttributeMultiExitDisc{})
attrMap[bgp.BGP_ATTR_TYPE_LOCAL_PREF] = reflect.TypeOf(&bgp.PathAttributeLocalPref{})
attrMap[bgp.BGP_ATTR_TYPE_ATOMIC_AGGREGATE] = reflect.TypeOf(&bgp.PathAttributeAtomicAggregate{})
attrMap[bgp.BGP_ATTR_TYPE_AGGREGATOR] = reflect.TypeOf(&bgp.PathAttributeAggregator{})
attrMap[bgp.BGP_ATTR_TYPE_COMMUNITIES] = reflect.TypeOf(&bgp.PathAttributeCommunities{})
attrMap[bgp.BGP_ATTR_TYPE_ORIGINATOR_ID] = reflect.TypeOf(&bgp.PathAttributeOriginatorId{})
attrMap[bgp.BGP_ATTR_TYPE_CLUSTER_LIST] = reflect.TypeOf(&bgp.PathAttributeClusterList{})
attrMap[bgp.BGP_ATTR_TYPE_MP_REACH_NLRI] = reflect.TypeOf(&bgp.PathAttributeMpReachNLRI{})
attrMap[bgp.BGP_ATTR_TYPE_MP_UNREACH_NLRI] = reflect.TypeOf(&bgp.PathAttributeMpUnreachNLRI{})
attrMap[bgp.BGP_ATTR_TYPE_EXTENDED_COMMUNITIES] = reflect.TypeOf(&bgp.PathAttributeExtendedCommunities{})
attrMap[bgp.BGP_ATTR_TYPE_AS4_PATH] = reflect.TypeOf(&bgp.PathAttributeAs4Path{})
attrMap[bgp.BGP_ATTR_TYPE_AS4_AGGREGATOR] = reflect.TypeOf(&bgp.PathAttributeAs4Aggregator{})
t := attrMap[pattrType]
for i, p := range pd.pathAttrs {
if t == reflect.TypeOf(p) {
return i, p
}
}
return -1, nil
}
// return Path's string representation
func (pi *PathDefault) String() string {
str := fmt.Sprintf("IPv4Path Source: %v, ", pi.getSource())
str = str + fmt.Sprintf(" NLRI: %s, ", pi.getPrefix())
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() string {
switch nlri := pi.nlri.(type) {
case *bgp.NLRInfo:
return nlri.IPAddrPrefix.IPAddrPrefixDefault.String()
case *bgp.WithdrawnRoute:
return nlri.IPAddrPrefix.IPAddrPrefixDefault.String()
}
log.Fatal()
return ""
}
// create Path object based on route family
func CreatePath(source *PeerInfo, nlri bgp.AddrPrefixInterface, attrs []bgp.PathAttributeInterface, isWithdraw bool, now time.Time) Path {
rf := bgp.RouteFamily(int(nlri.AFI())<<16 | int(nlri.SAFI()))
log.Debugf("afi: %d, safi: %d ", int(nlri.AFI()), nlri.SAFI())
var path Path
switch rf {
case bgp.RF_IPv4_UC:
log.Debugf("RouteFamily : %s", bgp.RF_IPv4_UC.String())
path = NewIPv4Path(source, nlri, isWithdraw, attrs, false, now)
case bgp.RF_IPv6_UC:
log.Debugf("RouteFamily : %s", bgp.RF_IPv6_UC.String())
path = NewIPv6Path(source, nlri, isWithdraw, attrs, false, now)
}
return path
}
/*
* Definition of inherited Path interface
*/
type IPv4Path struct {
*PathDefault
}
func NewIPv4Path(source *PeerInfo, nlri bgp.AddrPrefixInterface, isWithdraw bool, attrs []bgp.PathAttributeInterface, medSetByTargetNeighbor bool, now time.Time) *IPv4Path {
ipv4Path := &IPv4Path{}
ipv4Path.PathDefault = NewPathDefault(bgp.RF_IPv4_UC, source, nlri, nil, isWithdraw, attrs, medSetByTargetNeighbor, now)
if !isWithdraw {
_, nexthop_attr := ipv4Path.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
ipv4Path.nexthop = nexthop_attr.(*bgp.PathAttributeNextHop).Value
}
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 *PeerInfo, nlri bgp.AddrPrefixInterface, isWithdraw bool, attrs []bgp.PathAttributeInterface, medSetByTargetNeighbor bool, now time.Time) *IPv6Path {
ipv6Path := &IPv6Path{}
ipv6Path.PathDefault = NewPathDefault(bgp.RF_IPv6_UC, source, nlri, nil, isWithdraw, attrs, medSetByTargetNeighbor, now)
if !isWithdraw {
_, mpattr := ipv6Path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
ipv6Path.nexthop = mpattr.(*bgp.PathAttributeMpReachNLRI).Nexthop
}
return ipv6Path
}
func (ipv6p *IPv6Path) clone(isWithdraw bool) Path {
nlri := ipv6p.nlri
if isWithdraw {
if ipv6p.IsWithdraw() {
log.Fatal("Withdraw path is not supposed to be cloned")
}
}
return CreatePath(ipv6p.source, nlri, ipv6p.pathAttrs, isWithdraw, ipv6p.PathDefault.timestamp)
}
func (ipv6p *IPv6Path) setPathDefault(pd *PathDefault) {
ipv6p.PathDefault = pd
}
func (ipv6p *IPv6Path) getPathDefault() *PathDefault {
return ipv6p.PathDefault
}
func (ipv6p *IPv6Path) getPrefix() string {
addrPrefix := ipv6p.nlri.(*bgp.IPv6AddrPrefix)
return addrPrefix.IPAddrPrefixDefault.String()
}
// return IPv6Path's string representation
func (ipv6p *IPv6Path) String() string {
str := fmt.Sprintf("IPv6Path Source: %v, ", ipv6p.getSource())
str = str + fmt.Sprintf(" NLRI: %s, ", ipv6p.getPrefix())
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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