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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"
"net"
"reflect"
)
type Table interface {
createDest(nlri bgp.AddrPrefixInterface) Destination
getDestinations() map[string]Destination
setDestinations(destinations map[string]Destination)
getDestination(key string) Destination
setDestination(key string, dest Destination)
tableKey(nlri bgp.AddrPrefixInterface) net.IP
validatePath(path Path)
validateNlri(nlri bgp.AddrPrefixInterface)
}
type TableDefault struct {
ROUTE_FAMILY RouteFamily
destinations map[string]Destination
//need SignalBus
}
func NewTableDefault(scope_id int) *TableDefault {
table := &TableDefault{}
table.ROUTE_FAMILY = RF_IPv4_UC
table.destinations = make(map[string]Destination)
return table
}
func (td *TableDefault) getRoutefamily() RouteFamily {
return td.ROUTE_FAMILY
}
//Creates destination
//Implements interface
func (td *TableDefault) createDest(nlri *bgp.NLRInfo) Destination {
//return NewDestination(td, nlri)
logger.Error("CreateDest NotImplementedError")
return nil
}
func insert(table Table, path Path) Destination {
var dest Destination
table.validatePath(path)
table.validateNlri(path.GetNlri())
dest = getOrCreateDest(table, path.GetNlri())
if path.isWithdraw() {
// withdraw insert
dest.addWithdraw(path)
} else {
// path insert
dest.addNewPath(path)
}
return dest
}
/*
//Cleans table of any path that do not have any RT in common with interested_rts
// Commented out because it is a VPN-related processing
func (td *TableDefault) cleanUninterestingPaths(interested_rts) int {
uninterestingDestCount = 0
for _, dest := range td.destinations {
addedWithdraw :=dest.withdrawUnintrestingPaths(interested_rts)
if addedWithdraw{
//need _signal_bus.dest_changed(dest)
uninterestingDestCount += 1
}
}
return uninterestingDestCount
// need content
}
*/
func deleteDestByNlri(table Table, nlri bgp.AddrPrefixInterface) Destination {
table.validateNlri(nlri)
destinations := table.getDestinations()
dest := destinations[table.tableKey(nlri).String()]
if dest != nil {
delete(destinations, table.tableKey(nlri).String())
}
return dest
}
func deleteDest(table Table, dest Destination) {
destinations := table.getDestinations()
delete(destinations, table.tableKey(dest.getNlri()).String())
}
func (td *TableDefault) validatePath(path Path) {
if path == nil || path.getRouteFamily() != td.ROUTE_FAMILY {
logger.Errorf("Invalid path. Expected instance of %s route family path, got %s.", td.ROUTE_FAMILY, path)
}
}
func (td *TableDefault) validateNlri(nlri bgp.AddrPrefixInterface) {
if nlri == nil {
logger.Error("Invalid Vpnv4 prefix given.")
}
}
func getOrCreateDest(table Table, nlri bgp.AddrPrefixInterface) Destination {
logger.Debugf("Table type : %s", reflect.TypeOf(table))
tableKey := table.tableKey(nlri)
dest := table.getDestination(tableKey.String())
// If destination for given prefix does not exist we create it.
if dest == nil {
logger.Debugf("dest with key %s is not found", tableKey.String())
dest = table.createDest(nlri)
table.setDestination(tableKey.String(), dest)
}
return dest
}
func (td *TableDefault) getDestinations() map[string]Destination {
return td.destinations
}
func (td *TableDefault) setDestinations(destinations map[string]Destination) {
td.destinations = destinations
}
func (td *TableDefault) getDestination(key string) Destination {
dest, ok := td.destinations[key]
if ok {
return dest
} else {
return nil
}
}
func (td *TableDefault) setDestination(key string, dest Destination) {
td.destinations[key] = dest
}
//Implements interface
func (td *TableDefault) tableKey(nlri bgp.AddrPrefixInterface) net.IP {
//need Inheritance over ride
//return &nlri.IPAddrPrefix.IPAddrPrefixDefault.Prefix
logger.Error("CreateDest NotImplementedError")
return nil
}
/*
* Definition of inherited Table interface
*/
type IPv4Table struct {
*TableDefault
//need structure
}
func NewIPv4Table(scope_id int) *IPv4Table {
ipv4Table := &IPv4Table{}
ipv4Table.TableDefault = NewTableDefault(scope_id)
ipv4Table.TableDefault.ROUTE_FAMILY = RF_IPv4_UC
//need Processing
return ipv4Table
}
//Creates destination
//Implements interface
func (ipv4t *IPv4Table) createDest(nlri bgp.AddrPrefixInterface) Destination {
return NewIPv4Destination(nlri)
}
//make tablekey
//Implements interface
func (ipv4t *IPv4Table) tableKey(nlri bgp.AddrPrefixInterface) net.IP {
//addrPrefix := nlri.(*bgp.IPAddrPrefix)
var ip net.IP
switch p := nlri.(type) {
case *bgp.NLRInfo:
ip = p.IPAddrPrefix.IPAddrPrefixDefault.Prefix
case *bgp.WithdrawnRoute:
ip = p.IPAddrPrefix.IPAddrPrefixDefault.Prefix
}
return ip
}
type IPv6Table struct {
*TableDefault
//need structure
}
func NewIPv6Table(scope_id int) *IPv6Table {
ipv6Table := &IPv6Table{}
ipv6Table.TableDefault = NewTableDefault(scope_id)
ipv6Table.TableDefault.ROUTE_FAMILY = RF_IPv6_UC
//need Processing
return ipv6Table
}
//Creates destination
//Implements interface
func (ipv6t *IPv6Table) createDest(nlri bgp.AddrPrefixInterface) Destination {
return Destination(NewIPv6Destination(nlri))
}
//make tablekey
//Implements interface
func (ipv6t *IPv6Table) tableKey(nlri bgp.AddrPrefixInterface) net.IP {
addrPrefix := nlri.(*bgp.IPv6AddrPrefix)
return addrPrefix.IPAddrPrefixDefault.Prefix
}
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