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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
// 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 server
import (
"fmt"
log "github.com/Sirupsen/logrus"
"github.com/osrg/gobgp/api"
"github.com/osrg/gobgp/config"
"github.com/osrg/gobgp/packet"
"net"
"os"
"strconv"
"strings"
)
const (
_ = iota
PEER_MSG_NEW
PEER_MSG_PATH
PEER_MSG_DOWN
PEER_MSG_REST //hacky, fix later
)
type message struct {
src string
dst string
event int
data interface{}
}
type BgpServer struct {
bgpConfig config.BgpType
globalTypeCh chan config.GlobalType
addedPeerCh chan config.NeighborType
deletedPeerCh chan config.NeighborType
RestReqCh chan *api.RestRequest
listenPort int
peerMap map[string]*Peer
}
func NewBgpServer(port int) *BgpServer {
b := BgpServer{}
b.globalTypeCh = make(chan config.GlobalType)
b.addedPeerCh = make(chan config.NeighborType)
b.deletedPeerCh = make(chan config.NeighborType)
b.RestReqCh = make(chan *api.RestRequest, 1)
b.listenPort = port
return &b
}
func (server *BgpServer) Serve() {
server.bgpConfig.Global = <-server.globalTypeCh
service := ":" + strconv.Itoa(server.listenPort)
addr, _ := net.ResolveTCPAddr("tcp", service)
l, err := net.ListenTCP("tcp4", addr)
if err != nil {
log.Fatal(err)
os.Exit(1)
}
acceptCh := make(chan *net.TCPConn)
go func() {
for {
conn, err := l.Accept()
if err != nil {
log.Info(err)
continue
}
acceptCh <- conn.(*net.TCPConn)
}
}()
server.peerMap = make(map[string]*Peer)
broadcastCh := make(chan *message)
for {
f, _ := l.File()
select {
case conn := <-acceptCh:
remoteAddr := strings.Split(conn.RemoteAddr().String(), ":")[0]
peer, found := server.peerMap[remoteAddr]
if found {
log.Info("accepted a new passive connection from ", remoteAddr)
peer.PassConn(conn)
} else {
log.Info("can't find configuration for a new passive connection from ", remoteAddr)
conn.Close()
}
case peer := <-server.addedPeerCh:
addr := peer.NeighborAddress.String()
SetTcpMD5SigSockopts(int(f.Fd()), addr, peer.AuthPassword)
p := NewPeer(server.bgpConfig.Global, peer, broadcastCh)
server.peerMap[peer.NeighborAddress.String()] = p
case peer := <-server.deletedPeerCh:
addr := peer.NeighborAddress.String()
SetTcpMD5SigSockopts(int(f.Fd()), addr, "")
p, found := server.peerMap[addr]
if found {
log.Info("Delete a peer configuration for ", addr)
p.Stop()
delete(server.peerMap, addr)
} else {
log.Info("Can't delete a peer configuration for ", addr)
}
case restReq := <-server.RestReqCh:
server.handleRest(restReq)
case msg := <-broadcastCh:
server.broadcast(msg)
}
}
}
func (server *BgpServer) SetGlobalType(g config.GlobalType) {
server.globalTypeCh <- g
}
func (server *BgpServer) PeerAdd(peer config.NeighborType) {
server.addedPeerCh <- peer
}
func (server *BgpServer) PeerDelete(peer config.NeighborType) {
server.deletedPeerCh <- peer
}
func (server *BgpServer) broadcast(msg *message) {
for key := range server.peerMap {
if key == msg.src {
continue
}
if msg.dst == "" || msg.dst == key {
peer := server.peerMap[key]
peer.SendMessage(msg)
}
}
}
func (server *BgpServer) handleRest(restReq *api.RestRequest) {
switch restReq.RequestType {
case api.REQ_NEIGHBORS:
result := &api.RestResponseDefault{}
peerList := make([]*Peer, 0)
for _, peer := range server.peerMap {
peerList = append(peerList, peer)
}
result.Data = peerList
restReq.ResponseCh <- result
close(restReq.ResponseCh)
case api.REQ_NEIGHBOR: // get neighbor state
remoteAddr := restReq.RemoteAddr
result := &api.RestResponseNeighbor{}
peer, found := server.peerMap[remoteAddr]
if found {
c := peer.peerConfig
result.NeighborState = bgp.FSMState(c.BgpNeighborCommonState.State).String()
result.RemoteAddr = c.NeighborAddress.String()
result.RemoteAs = c.PeerAs
} else {
result.ResponseErr = fmt.Errorf("Neighbor that has %v does not exist.", remoteAddr)
}
restReq.ResponseCh <- result
close(restReq.ResponseCh)
case api.REQ_LOCAL_RIB:
remoteAddr := restReq.RemoteAddr
result := &api.RestResponseNeighbor{}
peer, found := server.peerMap[remoteAddr]
if found {
msg := message{
event: PEER_MSG_REST,
data: restReq,
}
peer.SendMessage(&msg)
} else {
result.ResponseErr = fmt.Errorf("Neighbor that has %v does not exist.", remoteAddr)
restReq.ResponseCh <- result
close(restReq.ResponseCh)
}
}
}
|
