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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 (
"github.com/osrg/gobgp/packet"
"reflect"
)
func UpdatePathAttrs2ByteAs(msg *bgp.BGPUpdate) error {
var asAttr *bgp.PathAttributeAsPath
for _, attr := range msg.PathAttributes {
switch attr.(type) {
case *bgp.PathAttributeAsPath:
asAttr = attr.(*bgp.PathAttributeAsPath)
}
}
as4pathParam := make([]*bgp.As4PathParam, 0)
for i, param := range asAttr.Value {
asParam, y := param.(*bgp.As4PathParam)
if !y {
continue
}
newAs := make([]uint32, 0)
oldAs := make([]uint16, len(asParam.AS))
for j := 0; j < len(asParam.AS); j++ {
if asParam.AS[j] > (1<<16)-1 {
oldAs[j] = bgp.AS_TRANS
newAs = append(newAs, asParam.AS[j])
} else {
oldAs[j] = uint16(asParam.AS[j])
}
}
asAttr.Value[i] = bgp.NewAsPathParam(asParam.Type, oldAs)
if len(newAs) > 0 {
as4pathParam = append(as4pathParam, bgp.NewAs4PathParam(asParam.Type, newAs))
}
}
if len(as4pathParam) > 0 {
msg.PathAttributes = append(msg.PathAttributes, bgp.NewPathAttributeAs4Path(as4pathParam))
}
return nil
}
func UpdatePathAttrs4ByteAs(msg *bgp.BGPUpdate) error {
newPathAttrs := make([]bgp.PathAttributeInterface, 0)
var asAttr *bgp.PathAttributeAsPath
var as4Attr *bgp.PathAttributeAs4Path
for _, attr := range msg.PathAttributes {
switch attr.(type) {
case *bgp.PathAttributeAsPath:
asAttr = attr.(*bgp.PathAttributeAsPath)
newPathAttrs = append(newPathAttrs, attr)
case *bgp.PathAttributeAs4Path:
as4Attr = attr.(*bgp.PathAttributeAs4Path)
default:
newPathAttrs = append(newPathAttrs, attr)
}
}
AS := make([]uint32, 0)
if as4Attr != nil {
for _, p := range as4Attr.Value {
AS = append(AS, p.AS...)
}
msg.PathAttributes = newPathAttrs
}
transIdx := 0
for i, param := range asAttr.Value {
asParam, y := param.(*bgp.AsPathParam)
if !y {
continue
}
newAS := make([]uint32, len(asParam.AS))
for j := 0; j < len(asParam.AS); j++ {
if asParam.AS[j] == bgp.AS_TRANS {
if transIdx == len(AS) {
//return error
}
newAS[j] = AS[transIdx]
transIdx++
} else {
newAS[j] = uint32(asParam.AS[j])
}
}
asAttr.Value[i] = bgp.NewAs4PathParam(asParam.Type, newAS)
}
if len(AS) != transIdx {
//return error
}
return nil
}
func clonePathAttributes(attrs []bgp.PathAttributeInterface) []bgp.PathAttributeInterface {
clonedAttrs := []bgp.PathAttributeInterface(nil)
clonedAttrs = append(clonedAttrs, attrs...)
for i, attr := range clonedAttrs {
t, v := reflect.TypeOf(attr), reflect.ValueOf(attr)
newAttrObjp := reflect.New(t.Elem())
newAttrObjp.Elem().Set(v.Elem())
clonedAttrs[i] = newAttrObjp.Interface().(bgp.PathAttributeInterface)
}
return clonedAttrs
}
func CreateUpdateMsgFromPath(path Path, msg *bgp.BGPMessage) (*bgp.BGPMessage, error) {
rf := path.GetRouteFamily()
if rf == bgp.RF_IPv4_UC {
if path.IsWithdraw() {
draw := path.getNlri().(*bgp.WithdrawnRoute)
return bgp.NewBGPUpdateMessage([]bgp.WithdrawnRoute{*draw}, []bgp.PathAttributeInterface{}, []bgp.NLRInfo{}), nil
} else {
nlri := path.getNlri().(*bgp.NLRInfo)
pathAttrs := path.getPathAttrs()
return bgp.NewBGPUpdateMessage([]bgp.WithdrawnRoute{}, pathAttrs, []bgp.NLRInfo{*nlri}), nil
}
} else if rf == bgp.RF_IPv6_UC {
if path.IsWithdraw() {
clonedAttrs := clonePathAttributes(path.getPathAttrs())
idx, attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
reach := attr.(*bgp.PathAttributeMpReachNLRI)
clonedAttrs[idx] = bgp.NewPathAttributeMpUnreachNLRI(reach.Value)
return bgp.NewBGPUpdateMessage([]bgp.WithdrawnRoute{}, clonedAttrs, []bgp.NLRInfo{}), nil
} else {
return bgp.NewBGPUpdateMessage([]bgp.WithdrawnRoute{}, path.getPathAttrs(), []bgp.NLRInfo{}), nil
}
}
return nil, nil
}
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