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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 (
log "github.com/Sirupsen/logrus"
"github.com/osrg/gobgp/packet"
"reflect"
)
type Table struct {
routeFamily bgp.RouteFamily
destinations map[string]*Destination
}
func NewTable(rf bgp.RouteFamily) *Table {
return &Table{
routeFamily: rf,
destinations: make(map[string]*Destination),
}
}
func (t *Table) GetRoutefamily() bgp.RouteFamily {
return t.routeFamily
}
func (t *Table) insert(path *Path) *Destination {
var dest *Destination
t.validatePath(path)
t.validateNlri(path.GetNlri())
dest = t.getOrCreateDest(path.GetNlri())
if path.IsWithdraw {
// withdraw insert
dest.addWithdraw(path)
} else {
// path insert
dest.addNewPath(path)
}
return dest
}
func (t *Table) DeleteDestByPeer(peerInfo *PeerInfo) []*Destination {
changedDests := make([]*Destination, 0)
for _, dest := range t.destinations {
newKnownPathList := make([]*Path, 0)
for _, p := range dest.GetKnownPathList() {
if !p.GetSource().Equal(peerInfo) {
newKnownPathList = append(newKnownPathList, p)
}
}
if len(newKnownPathList) != len(dest.GetKnownPathList()) {
changedDests = append(changedDests, dest)
dest.setKnownPathList(newKnownPathList)
}
}
return changedDests
}
func (t *Table) deleteDestByNlri(nlri bgp.AddrPrefixInterface) *Destination {
t.validateNlri(nlri)
destinations := t.GetDestinations()
dest := destinations[t.tableKey(nlri)]
if dest != nil {
delete(destinations, t.tableKey(nlri))
}
return dest
}
func (t *Table) deleteDest(dest *Destination) {
destinations := t.GetDestinations()
delete(destinations, t.tableKey(dest.GetNlri()))
}
func (t *Table) validatePath(path *Path) {
if path == nil || path.GetRouteFamily() != t.routeFamily {
if path == nil {
log.WithFields(log.Fields{
"Topic": "Table",
"Key": t.routeFamily,
}).Error("path is nil")
} else if path.GetRouteFamily() != t.routeFamily {
log.WithFields(log.Fields{
"Topic": "Table",
"Key": t.routeFamily,
"Prefix": path.GetNlri().String(),
"ReceivedRf": path.GetRouteFamily().String(),
}).Error("Invalid path. RouteFamily mismatch")
}
}
_, attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
if attr != nil {
pathParam := attr.(*bgp.PathAttributeAsPath).Value
for _, as := range pathParam {
_, y := as.(*bgp.As4PathParam)
if !y {
log.WithFields(log.Fields{
"Topic": "Table",
"Key": t.routeFamily,
"As": as,
}).Fatal("AsPathParam must be converted to As4PathParam")
}
}
}
_, attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_AS4_PATH)
if attr != nil {
log.WithFields(log.Fields{
"Topic": "Table",
"Key": t.routeFamily,
}).Fatal("AS4_PATH must be converted to AS_PATH")
}
}
func (t *Table) validateNlri(nlri bgp.AddrPrefixInterface) {
if nlri == nil {
log.WithFields(log.Fields{
"Topic": "Table",
"Key": t.routeFamily,
"Nlri": nlri,
}).Error("Invalid Vpnv4 prefix given.")
}
}
func (t *Table) getOrCreateDest(nlri bgp.AddrPrefixInterface) *Destination {
log.Debugf("getOrCreateDest Table type : %s", reflect.TypeOf(t))
tableKey := t.tableKey(nlri)
dest := t.GetDestination(tableKey)
// If destination for given prefix does not exist we create it.
if dest == nil {
log.Debugf("getOrCreateDest dest with key %s is not found", tableKey)
dest = NewDestination(nlri)
t.setDestination(tableKey, dest)
}
return dest
}
func (t *Table) GetDestinations() map[string]*Destination {
return t.destinations
}
func (t *Table) setDestinations(destinations map[string]*Destination) {
t.destinations = destinations
}
func (t *Table) GetDestination(key string) *Destination {
dest, ok := t.destinations[key]
if ok {
return dest
} else {
return nil
}
}
func (t *Table) setDestination(key string, dest *Destination) {
t.destinations[key] = dest
}
func (t *Table) tableKey(nlri bgp.AddrPrefixInterface) string {
return nlri.String()
}
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