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// Copyright (C) 2015 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 (
"fmt"
"github.com/osrg/gobgp/pkg/packet/bgp"
)
type AdjRib struct {
accepted map[bgp.RouteFamily]int
table map[bgp.RouteFamily]*Table
}
func NewAdjRib(rfList []bgp.RouteFamily) *AdjRib {
m := make(map[bgp.RouteFamily]*Table)
for _, f := range rfList {
m[f] = NewTable(f)
}
return &AdjRib{
table: m,
accepted: make(map[bgp.RouteFamily]int),
}
}
func (adj *AdjRib) Update(pathList []*Path) {
for _, path := range pathList {
if path == nil || path.IsEOR() {
continue
}
rf := path.GetRouteFamily()
t := adj.table[path.GetRouteFamily()]
d := t.getOrCreateDest(path.GetNlri(), 0)
var old *Path
idx := -1
for i, p := range d.knownPathList {
if p.GetNlri().PathIdentifier() == path.GetNlri().PathIdentifier() {
idx = i
break
}
}
if idx != -1 {
old = d.knownPathList[idx]
}
if path.IsWithdraw {
if idx != -1 {
d.knownPathList = append(d.knownPathList[:idx], d.knownPathList[idx+1:]...)
if len(d.knownPathList) == 0 {
t.deleteDest(d)
}
if !old.IsRejected() {
adj.accepted[rf]--
}
}
path.SetDropped(true)
} else {
if idx != -1 {
if old.IsRejected() && !path.IsRejected() {
adj.accepted[rf]++
} else if !old.IsRejected() && path.IsRejected() {
adj.accepted[rf]--
}
if old.Equal(path) {
path.setTimestamp(old.GetTimestamp())
}
d.knownPathList[idx] = path
} else {
d.knownPathList = append(d.knownPathList, path)
if !path.IsRejected() {
adj.accepted[rf]++
}
}
}
}
}
/* The provided pathList is expected to be the real candidate routes after policy evaluation.
For routes that are filtered by policy, there could be a mismatch between display
and actual rib sent to the peer (if softreset out was not run).
Only used to display adj-out because we do not maintain a separate adj-out table
*/
func (adj *AdjRib) UpdateAdjRibOut(pathList []*Path) {
for _, path := range pathList {
if path == nil || path.IsEOR() {
continue
}
t := adj.table[path.GetRouteFamily()]
d := t.getOrCreateDest(path.GetNlri(), 0)
d.knownPathList = append(d.knownPathList, path)
}
}
func (adj *AdjRib) walk(families []bgp.RouteFamily, fn func(*Destination) bool) {
for _, f := range families {
if t, ok := adj.table[f]; ok {
for _, d := range t.destinations {
if fn(d) {
return
}
}
}
}
}
func (adj *AdjRib) PathList(rfList []bgp.RouteFamily, accepted bool) []*Path {
pathList := make([]*Path, 0, adj.Count(rfList))
adj.walk(rfList, func(d *Destination) bool {
for _, p := range d.knownPathList {
if accepted && p.IsRejected() {
continue
}
pathList = append(pathList, p)
}
return false
})
return pathList
}
func (adj *AdjRib) Count(rfList []bgp.RouteFamily) int {
count := 0
adj.walk(rfList, func(d *Destination) bool {
count += len(d.knownPathList)
return false
})
return count
}
func (adj *AdjRib) Accepted(rfList []bgp.RouteFamily) int {
count := 0
for _, rf := range rfList {
if n, ok := adj.accepted[rf]; ok {
count += n
}
}
return count
}
func (adj *AdjRib) Drop(rfList []bgp.RouteFamily) []*Path {
l := make([]*Path, 0, adj.Count(rfList))
adj.walk(rfList, func(d *Destination) bool {
for _, p := range d.knownPathList {
w := p.Clone(true)
w.SetDropped(true)
l = append(l, w)
}
return false
})
for _, rf := range rfList {
adj.table[rf] = NewTable(rf)
adj.accepted[rf] = 0
}
return l
}
func (adj *AdjRib) DropStale(rfList []bgp.RouteFamily) []*Path {
pathList := make([]*Path, 0, adj.Count(rfList))
adj.walk(rfList, func(d *Destination) bool {
for _, p := range d.knownPathList {
if p.IsStale() {
w := p.Clone(true)
w.SetDropped(true)
pathList = append(pathList, w)
}
}
return false
})
adj.Update(pathList)
return pathList
}
func (adj *AdjRib) StaleAll(rfList []bgp.RouteFamily) []*Path {
pathList := make([]*Path, 0, adj.Count(rfList))
adj.walk(rfList, func(d *Destination) bool {
for i, p := range d.knownPathList {
n := p.Clone(false)
n.MarkStale(true)
n.SetRejected(p.IsRejected())
d.knownPathList[i] = n
if !n.IsRejected() {
pathList = append(pathList, n)
}
}
return false
})
return pathList
}
func (adj *AdjRib) MarkLLGRStaleOrDrop(rfList []bgp.RouteFamily) []*Path {
pathList := make([]*Path, 0, adj.Count(rfList))
adj.walk(rfList, func(d *Destination) bool {
for i, p := range d.knownPathList {
if p.HasNoLLGR() {
n := p.Clone(true)
n.SetDropped(true)
pathList = append(pathList, n)
} else {
n := p.Clone(false)
n.SetRejected(p.IsRejected())
n.SetCommunities([]uint32{uint32(bgp.COMMUNITY_LLGR_STALE)}, false)
if p.IsRejected() {
d.knownPathList[i] = n
} else {
pathList = append(pathList, n)
}
}
}
return false
})
adj.Update(pathList)
return pathList
}
func (adj *AdjRib) Select(family bgp.RouteFamily, accepted bool, option ...TableSelectOption) (*Table, error) {
t, ok := adj.table[family]
if !ok {
t = NewTable(family)
}
option = append(option, TableSelectOption{adj: true})
return t.Select(option...)
}
func (adj *AdjRib) TableInfo(family bgp.RouteFamily) (*TableInfo, error) {
if _, ok := adj.table[family]; !ok {
return nil, fmt.Errorf("%s unsupported", family)
}
c := adj.Count([]bgp.RouteFamily{family})
a := adj.Accepted([]bgp.RouteFamily{family})
return &TableInfo{
NumDestination: c,
NumPath: c,
NumAccepted: a,
}, nil
}
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