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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 gobgpapi
import (
"fmt"
"net"
"time"
"github.com/osrg/gobgp/config"
"github.com/osrg/gobgp/packet/bgp"
"github.com/osrg/gobgp/table"
)
type ToNativeOption struct {
LocalAS uint32
LocalID net.IP
RouteReflectorClient bool
RouteReflectorClusterID net.IP
NLRI bgp.AddrPrefixInterface
}
func (t *Table) ToNativeTable(option ...ToNativeOption) (*table.Table, error) {
dsts := make([]*table.Destination, 0, len(t.Destinations))
for _, d := range t.Destinations {
dst, err := d.ToNativeDestination(option...)
if err != nil {
return nil, err
}
dsts = append(dsts, dst)
}
return table.NewTable(bgp.RouteFamily(t.Family), dsts...), nil
}
func getNLRI(family bgp.RouteFamily, buf []byte) (bgp.AddrPrefixInterface, error) {
afi, safi := bgp.RouteFamilyToAfiSafi(bgp.RouteFamily(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 (d *Destination) ToNativeDestination(option ...ToNativeOption) (*table.Destination, error) {
if len(d.Paths) == 0 {
return nil, fmt.Errorf("no path in destination")
}
nlri, err := getNLRI(bgp.RouteFamily(d.Paths[0].Family), d.Paths[0].Nlri)
if err != nil {
return nil, err
}
option = append(option, ToNativeOption{
NLRI: nlri,
})
paths := make([]*table.Path, 0, len(d.Paths))
for _, p := range d.Paths {
var path *table.Path
var err error
if p.Identifier > 0 {
path, err = p.ToNativePath()
} else {
path, err = p.ToNativePath(option...)
}
if err != nil {
return nil, err
}
paths = append(paths, path)
}
return table.NewDestination(nlri, paths...), nil
}
func (p *Path) ToNativePath(option ...ToNativeOption) (*table.Path, error) {
info := &table.PeerInfo{
AS: p.SourceAsn,
ID: net.ParseIP(p.SourceId),
Address: net.ParseIP(p.NeighborIp),
}
var nlri bgp.AddrPrefixInterface
for _, o := range option {
info.LocalAS = o.LocalAS
info.LocalID = o.LocalID
info.RouteReflectorClient = o.RouteReflectorClient
info.RouteReflectorClusterID = o.RouteReflectorClusterID
nlri = o.NLRI
}
if nlri == nil {
var err error
nlri, err = getNLRI(bgp.RouteFamily(p.Family), p.Nlri)
if err != nil {
return nil, err
}
}
pattr := make([]bgp.PathAttributeInterface, 0, len(p.Pattrs))
for _, attr := range p.Pattrs {
p, err := bgp.GetPathAttribute(attr)
if err != nil {
return nil, err
}
err = p.DecodeFromBytes(attr)
if err != nil {
return nil, err
}
pattr = append(pattr, p)
}
t := time.Unix(p.Age, 0)
nlri.SetPathIdentifier(p.Identifier)
path := table.NewPath(info, nlri, p.IsWithdraw, pattr, t, false)
path.SetValidation(&table.Validation{
Status: config.IntToRpkiValidationResultTypeMap[int(p.Validation)],
Reason: table.IntToRpkiValidationReasonTypeMap[int(p.ValidationDetail.Reason)],
Matched: NewROAListFromApiStructList(p.ValidationDetail.Matched),
UnmatchedAs: NewROAListFromApiStructList(p.ValidationDetail.UnmatchedAs),
UnmatchedLength: NewROAListFromApiStructList(p.ValidationDetail.UnmatchedLength),
})
path.MarkStale(p.Stale)
path.SetUUID(p.Uuid)
if p.Filtered {
path.Filter("", table.POLICY_DIRECTION_IN)
}
path.IsNexthopInvalid = p.IsNexthopInvalid
return path, nil
}
func NewROAListFromApiStructList(l []*Roa) []*table.ROA {
roas := make([]*table.ROA, 0, len(l))
for _, r := range l {
ip := net.ParseIP(r.Prefix)
rf := func(prefix string) bgp.RouteFamily {
a, _, _ := net.ParseCIDR(prefix)
if a.To4() != nil {
return bgp.RF_IPv4_UC
} else {
return bgp.RF_IPv6_UC
}
}(r.Prefix)
afi, _ := bgp.RouteFamilyToAfiSafi(rf)
roa := table.NewROA(int(afi), []byte(ip), uint8(r.Prefixlen), uint8(r.Maxlen), r.As, net.JoinHostPort(r.Conf.Address, r.Conf.RemotePort))
roas = append(roas, roa)
}
return roas
}
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