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route_utils.go
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/
route_utils.go
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// Copyright (c) 2017 Cisco and/or its affiliates.
//
// 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 l3plugin
import (
"bytes"
"fmt"
"net"
"sort"
"github.com/ligato/cn-infra/logging"
"github.com/ligato/cn-infra/utils/addrs"
"github.com/ligato/vpp-agent/plugins/defaultplugins/ifplugin/ifaceidx"
"github.com/ligato/vpp-agent/plugins/defaultplugins/l3plugin/model/l3"
"github.com/ligato/vpp-agent/plugins/defaultplugins/l3plugin/vppcalls"
)
// SortedRoutes type is used to implement sort interface for slice of Route.
type SortedRoutes []*vppcalls.Route
// Return length of slice.
// Implements sort.Interface
func (arr SortedRoutes) Len() int {
return len(arr)
}
// Swap swaps two items in slice identified by indices.
// Implements sort.Interface
func (arr SortedRoutes) Swap(i, j int) {
arr[i], arr[j] = arr[j], arr[i]
}
// Less returns true if the item at index i in slice
// should be sorted before the element with index j.
// Implements sort.Interface
func (arr SortedRoutes) Less(i, j int) bool {
return lessRoute(arr[i], arr[j])
}
func eqRoutes(a *vppcalls.Route, b *vppcalls.Route) bool {
return a.VrfID == b.VrfID &&
bytes.Equal(a.DstAddr.IP, b.DstAddr.IP) &&
bytes.Equal(a.DstAddr.Mask, b.DstAddr.Mask) &&
bytes.Equal(a.NextHopAddr, b.NextHopAddr) &&
a.OutIface == b.OutIface &&
a.Weight == b.Weight &&
a.Preference == b.Preference
}
func lessRoute(a *vppcalls.Route, b *vppcalls.Route) bool {
if a.VrfID != b.VrfID {
return a.VrfID < b.VrfID
}
if !bytes.Equal(a.DstAddr.IP, b.DstAddr.IP) {
return bytes.Compare(a.DstAddr.IP, b.DstAddr.IP) < 0
}
if !bytes.Equal(a.DstAddr.Mask, b.DstAddr.Mask) {
return bytes.Compare(a.DstAddr.Mask, b.DstAddr.Mask) < 0
}
if !bytes.Equal(a.NextHopAddr, b.NextHopAddr) {
return bytes.Compare(a.NextHopAddr, b.NextHopAddr) < 0
}
if a.OutIface != b.OutIface {
return a.OutIface < b.OutIface
}
if a.Preference != b.Preference {
return a.Preference < b.Preference
}
return a.Weight < b.Weight
}
// TransformRoute converts raw route data to Route object.
func TransformRoute(routeInput *l3.StaticRoutes_Route, index ifaceidx.SwIfIndex, log logging.Logger) (*vppcalls.Route, error) {
if routeInput == nil {
log.Infof("Route input is empty")
return nil, nil
}
if routeInput.DstIpAddr == "" {
log.Infof("Route does not contain destination address")
return nil, nil
}
parsedDestIP, isIpv6, err := addrs.ParseIPWithPrefix(routeInput.DstIpAddr)
if err != nil {
return nil, err
}
vrfID := routeInput.VrfId
ifName := routeInput.OutgoingInterface
ifIndex := vppcalls.NextHopOutgoingIfUnset
if ifName != "" {
var exists bool
ifIndex, _, exists = index.LookupIdx(ifName)
if !exists {
return nil, fmt.Errorf("route outgoing interface %v not found", ifName)
}
}
nextHopIP := net.ParseIP(routeInput.NextHopAddr)
if isIpv6 {
nextHopIP = nextHopIP.To16()
} else {
nextHopIP = nextHopIP.To4()
}
route := &vppcalls.Route{
VrfID: vrfID,
DstAddr: *parsedDestIP,
NextHopAddr: nextHopIP,
OutIface: ifIndex,
Weight: routeInput.Weight,
Preference: routeInput.Preference,
}
return route, nil
}
func (plugin *RouteConfigurator) diffRoutes(new []*vppcalls.Route, old []*vppcalls.Route) (toBeDeleted []*vppcalls.Route, toBeAdded []*vppcalls.Route) {
newSorted := SortedRoutes(new)
oldSorted := SortedRoutes(old)
sort.Sort(newSorted)
sort.Sort(oldSorted)
// Compare.
i := 0
j := 0
for i < len(newSorted) && j < len(oldSorted) {
if eqRoutes(newSorted[i], oldSorted[j]) {
i++
j++
} else {
if lessRoute(newSorted[i], oldSorted[j]) {
toBeAdded = append(toBeAdded, newSorted[i])
i++
} else {
toBeDeleted = append(toBeDeleted, oldSorted[j])
j++
}
}
}
for ; i < len(newSorted); i++ {
toBeAdded = append(toBeAdded, newSorted[i])
}
for ; j < len(oldSorted); j++ {
toBeDeleted = append(toBeDeleted, oldSorted[j])
}
return
}