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// Copyright (C) 2016 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 apiutil
import (
"encoding/json"
"fmt"
"net"
"time"
api "github.com/osrg/gobgp/v3/api"
"github.com/osrg/gobgp/v3/pkg/packet/bgp"
tspb "google.golang.org/protobuf/types/known/timestamppb"
)
// workaround. This for the json format compatibility. Once we update senario tests, we can remove this.
type Path struct {
Nlri bgp.AddrPrefixInterface `json:"nlri"`
Age int64 `json:"age"`
Best bool `json:"best"`
Attrs []bgp.PathAttributeInterface `json:"attrs"`
Stale bool `json:"stale"`
// true if the path has been filtered out due to max path count reached
SendMaxFiltered bool `json:"send-max-filtered,omitempty"`
Withdrawal bool `json:"withdrawal,omitempty"`
SourceID net.IP `json:"source-id,omitempty"`
NeighborIP net.IP `json:"neighbor-ip,omitempty"`
}
type Destination struct {
Paths []*Path
}
func (d *Destination) MarshalJSON() ([]byte, error) {
return json.Marshal(d.Paths)
}
func NewDestination(dst *api.Destination) *Destination {
l := make([]*Path, 0, len(dst.Paths))
for _, p := range dst.Paths {
nlri, _ := GetNativeNlri(p)
attrs, _ := GetNativePathAttributes(p)
l = append(l, &Path{
Nlri: nlri,
Age: p.Age.AsTime().Unix(),
Best: p.Best,
Attrs: attrs,
Stale: p.Stale,
SendMaxFiltered: p.SendMaxFiltered,
Withdrawal: p.IsWithdraw,
SourceID: net.ParseIP(p.SourceId),
NeighborIP: net.ParseIP(p.NeighborIp),
})
}
return &Destination{Paths: l}
}
func NewPath(nlri bgp.AddrPrefixInterface, isWithdraw bool, attrs []bgp.PathAttributeInterface, age time.Time) (*api.Path, error) {
n, err := MarshalNLRI(nlri)
if err != nil {
return nil, err
}
a, err := MarshalPathAttributes(attrs)
if err != nil {
return nil, err
}
return &api.Path{
Nlri: n,
Pattrs: a,
Age: tspb.New(age),
IsWithdraw: isWithdraw,
Family: ToApiFamily(nlri.AFI(), nlri.SAFI()),
Identifier: nlri.PathIdentifier(),
}, nil
}
func getNLRI(family bgp.RouteFamily, buf []byte) (bgp.AddrPrefixInterface, error) {
afi, safi := bgp.RouteFamilyToAfiSafi(family)
nlri, err := bgp.NewPrefixFromRouteFamily(afi, safi)
if err != nil {
return nil, err
}
if err := nlri.DecodeFromBytes(buf); err != nil {
return nil, err
}
return nlri, nil
}
func GetNativeNlri(p *api.Path) (bgp.AddrPrefixInterface, error) {
if p.Family == nil {
return nil, fmt.Errorf("family cannot be nil")
}
if len(p.NlriBinary) > 0 {
return getNLRI(ToRouteFamily(p.Family), p.NlriBinary)
}
return UnmarshalNLRI(ToRouteFamily(p.Family), p.Nlri)
}
func GetNativePathAttributes(p *api.Path) ([]bgp.PathAttributeInterface, error) {
pattrsLen := len(p.PattrsBinary)
if pattrsLen > 0 {
pattrs := make([]bgp.PathAttributeInterface, 0, pattrsLen)
for _, attr := range p.PattrsBinary {
a, err := bgp.GetPathAttribute(attr)
if err != nil {
return nil, err
}
err = a.DecodeFromBytes(attr)
if err != nil {
return nil, err
}
pattrs = append(pattrs, a)
}
return pattrs, nil
}
return UnmarshalPathAttributes(p.Pattrs)
}
func ToRouteFamily(f *api.Family) bgp.RouteFamily {
return bgp.AfiSafiToRouteFamily(uint16(f.Afi), uint8(f.Safi))
}
func ToApiFamily(afi uint16, safi uint8) *api.Family {
return &api.Family{
Afi: api.Family_Afi(afi),
Safi: api.Family_Safi(safi),
}
}
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