mirror of
https://github.com/alice-lg/alice-lg.git
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129 lines
3.7 KiB
Go
129 lines
3.7 KiB
Go
// Copyright (C) 2016 Nippon Telegraph and Telephone Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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// implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package apiutil
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import (
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"encoding/json"
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"net"
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"time"
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"github.com/golang/protobuf/ptypes"
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api "github.com/osrg/gobgp/api"
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"github.com/osrg/gobgp/pkg/packet/bgp"
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)
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// workaround. This for the json format compatibility. Once we update senario tests, we can remove this.
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type Path struct {
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Nlri bgp.AddrPrefixInterface `json:"nlri"`
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Age int64 `json:"age"`
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Best bool `json:"best"`
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Attrs []bgp.PathAttributeInterface `json:"attrs"`
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Stale bool `json:"stale"`
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Withdrawal bool `json:"withdrawal,omitempty"`
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SourceID net.IP `json:"source-id,omitempty"`
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NeighborIP net.IP `json:"neighbor-ip,omitempty"`
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}
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type Destination struct {
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Paths []*Path
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}
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func (d *Destination) MarshalJSON() ([]byte, error) {
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return json.Marshal(d.Paths)
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}
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func NewDestination(dst *api.Destination) *Destination {
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l := make([]*Path, 0, len(dst.Paths))
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for _, p := range dst.Paths {
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nlri, _ := GetNativeNlri(p)
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attrs, _ := GetNativePathAttributes(p)
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t, _ := ptypes.Timestamp(p.Age)
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l = append(l, &Path{
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Nlri: nlri,
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Age: t.Unix(),
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Best: p.Best,
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Attrs: attrs,
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Stale: p.Stale,
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Withdrawal: p.IsWithdraw,
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SourceID: net.ParseIP(p.SourceId),
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NeighborIP: net.ParseIP(p.NeighborIp),
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})
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}
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return &Destination{Paths: l}
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}
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func NewPath(nlri bgp.AddrPrefixInterface, isWithdraw bool, attrs []bgp.PathAttributeInterface, age time.Time) *api.Path {
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t, _ := ptypes.TimestampProto(age)
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return &api.Path{
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Nlri: MarshalNLRI(nlri),
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Pattrs: MarshalPathAttributes(attrs),
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Age: t,
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IsWithdraw: isWithdraw,
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Family: ToApiFamily(nlri.AFI(), nlri.SAFI()),
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Identifier: nlri.PathIdentifier(),
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}
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}
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func getNLRI(family bgp.RouteFamily, buf []byte) (bgp.AddrPrefixInterface, error) {
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afi, safi := bgp.RouteFamilyToAfiSafi(family)
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nlri, err := bgp.NewPrefixFromRouteFamily(afi, safi)
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if err != nil {
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return nil, err
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}
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if err := nlri.DecodeFromBytes(buf); err != nil {
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return nil, err
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}
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return nlri, nil
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}
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func GetNativeNlri(p *api.Path) (bgp.AddrPrefixInterface, error) {
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if len(p.NlriBinary) > 0 {
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return getNLRI(ToRouteFamily(p.Family), p.NlriBinary)
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}
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return UnmarshalNLRI(ToRouteFamily(p.Family), p.Nlri)
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}
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func GetNativePathAttributes(p *api.Path) ([]bgp.PathAttributeInterface, error) {
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pattrsLen := len(p.PattrsBinary)
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if pattrsLen > 0 {
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pattrs := make([]bgp.PathAttributeInterface, 0, pattrsLen)
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for _, attr := range p.PattrsBinary {
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a, err := bgp.GetPathAttribute(attr)
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if err != nil {
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return nil, err
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}
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err = a.DecodeFromBytes(attr)
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if err != nil {
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return nil, err
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}
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pattrs = append(pattrs, a)
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}
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return pattrs, nil
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}
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return UnmarshalPathAttributes(p.Pattrs)
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}
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func ToRouteFamily(f *api.Family) bgp.RouteFamily {
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return bgp.AfiSafiToRouteFamily(uint16(f.Afi), uint8(f.Safi))
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}
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func ToApiFamily(afi uint16, safi uint8) *api.Family {
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return &api.Family{
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Afi: api.Family_Afi(afi),
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Safi: api.Family_Safi(safi),
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}
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}
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