1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
// 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"
)
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)
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 {
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 {
log.WithFields(log.Fields{
"Topic": "Table",
"Key": t.routeFamily,
}).Error("path is nil")
}
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")
}
if _, attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH); 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")
}
}
}
if _, attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_AS4_PATH); attr != nil {
log.WithFields(log.Fields{
"Topic": "Table",
"Key": t.routeFamily,
}).Fatal("AS4_PATH must be converted to AS_PATH")
}
if path.GetNlri() == nil {
log.WithFields(log.Fields{
"Topic": "Table",
"Key": t.routeFamily,
}).Fatal("path's nlri is nil")
}
}
func (t *Table) getOrCreateDest(nlri bgp.AddrPrefixInterface) *Destination {
tableKey := t.tableKey(nlri)
dest := t.GetDestination(tableKey)
// If destination for given prefix does not exist we create it.
if dest == nil {
log.WithFields(log.Fields{
"Topic": "Table",
"Key": t.routeFamily,
}).Debugf("create Destination with key %s", 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()
}
|
