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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 server
import (
"fmt"
log "github.com/Sirupsen/logrus"
"github.com/osrg/gobgp/config"
"github.com/osrg/gobgp/packet/bgp"
"github.com/osrg/gobgp/table"
"github.com/osrg/gobgp/zebra"
"net"
"strconv"
"strings"
"time"
)
type broadcastZapiMsg struct {
client *zebra.Client
msg *zebra.Message
}
func (m *broadcastZapiMsg) send() {
m.client.Send(m.msg)
}
func newIPRouteMessage(path *table.Path) *zebra.Message {
l := strings.SplitN(path.GetNlri().String(), "/", 2)
var command zebra.API_TYPE
var prefix net.IP
nexthops := []net.IP{}
switch path.GetRouteFamily() {
case bgp.RF_IPv4_UC:
if path.IsWithdraw == true {
command = zebra.IPV4_ROUTE_DELETE
} else {
command = zebra.IPV4_ROUTE_ADD
}
prefix = net.ParseIP(l[0]).To4()
nexthops = append(nexthops, path.GetNexthop().To4())
case bgp.RF_IPv6_UC:
if path.IsWithdraw == true {
command = zebra.IPV6_ROUTE_DELETE
} else {
command = zebra.IPV6_ROUTE_ADD
}
prefix = net.ParseIP(l[0]).To16()
nexthops = append(nexthops, path.GetNexthop().To16())
default:
return nil
}
flags := uint8(zebra.MESSAGE_NEXTHOP)
plen, _ := strconv.Atoi(l[1])
med, err := path.GetMed()
if err == nil {
flags |= zebra.MESSAGE_METRIC
}
return &zebra.Message{
Header: zebra.Header{
Len: zebra.HEADER_SIZE,
Marker: zebra.HEADER_MARKER,
Version: zebra.VERSION,
Command: command,
},
Body: &zebra.IPRouteBody{
Type: zebra.ROUTE_BGP,
SAFI: zebra.SAFI_UNICAST,
Message: flags,
Prefix: prefix,
PrefixLength: uint8(plen),
Nexthops: nexthops,
Metric: med,
},
}
}
func createPathFromIPRouteMessage(m *zebra.Message, peerInfo *table.PeerInfo) *table.Path {
header := m.Header
body := m.Body.(*zebra.IPRouteBody)
isV4 := header.Command == zebra.IPV4_ROUTE_ADD || header.Command == zebra.IPV4_ROUTE_DELETE
var nlri bgp.AddrPrefixInterface
pattr := make([]bgp.PathAttributeInterface, 0)
var mpnlri *bgp.PathAttributeMpReachNLRI
var isWithdraw bool = header.Command == zebra.IPV4_ROUTE_DELETE || header.Command == zebra.IPV6_ROUTE_DELETE
origin := bgp.NewPathAttributeOrigin(bgp.BGP_ORIGIN_ATTR_TYPE_IGP)
pattr = append(pattr, origin)
log.WithFields(log.Fields{
"Topic": "Zebra",
"RouteType": body.Type.String(),
"Flag": body.Flags.String(),
"Message": body.Message,
"Prefix": body.Prefix,
"PrefixLength": body.PrefixLength,
"Nexthop": body.Nexthops,
"IfIndex": body.Ifindexs,
"Metric": body.Metric,
"Distance": body.Distance,
"api": header.Command.String(),
}).Debugf("create path from ip route message.")
if isV4 {
nlri = bgp.NewIPAddrPrefix(body.PrefixLength, body.Prefix.String())
nexthop := bgp.NewPathAttributeNextHop(body.Nexthops[0].String())
pattr = append(pattr, nexthop)
} else {
nlri = bgp.NewIPv6AddrPrefix(body.PrefixLength, body.Prefix.String())
mpnlri = bgp.NewPathAttributeMpReachNLRI(body.Nexthops[0].String(), []bgp.AddrPrefixInterface{nlri})
pattr = append(pattr, mpnlri)
}
med := bgp.NewPathAttributeMultiExitDisc(body.Metric)
pattr = append(pattr, med)
p := table.NewPath(peerInfo, nlri, isWithdraw, pattr, time.Now(), false)
p.SetIsFromExternal(true)
return p
}
func newBroadcastZapiBestMsg(cli *zebra.Client, path *table.Path) *broadcastZapiMsg {
if cli == nil {
return nil
}
m := newIPRouteMessage(path)
if m == nil {
return nil
}
return &broadcastZapiMsg{
client: cli,
msg: m,
}
}
func handleZapiMsg(msg *zebra.Message, server *BgpServer) []*SenderMsg {
switch b := msg.Body.(type) {
case *zebra.IPRouteBody:
pi := &table.PeerInfo{
AS: server.bgpConfig.Global.Config.As,
LocalID: net.ParseIP(server.bgpConfig.Global.Config.RouterId).To4(),
}
if b.Prefix != nil && len(b.Nexthops) > 0 && b.Type != zebra.ROUTE_KERNEL {
p := createPathFromIPRouteMessage(msg, pi)
msgs, _ := server.propagateUpdate(nil, []*table.Path{p})
return msgs
}
}
return nil
}
func NewZclient(url string, redistRouteTypes []config.InstallProtocolType) (*zebra.Client, error) {
l := strings.SplitN(url, ":", 2)
if len(l) != 2 {
return nil, fmt.Errorf("unsupported url: %s", url)
}
cli, err := zebra.NewClient(l[0], l[1], zebra.ROUTE_BGP)
if err != nil {
return nil, err
}
cli.SendHello()
cli.SendRouterIDAdd()
cli.SendInterfaceAdd()
for _, typ := range redistRouteTypes {
t, err := zebra.RouteTypeFromString(string(typ))
if err != nil {
return nil, err
}
cli.SendRedistribute(t)
}
return cli, nil
}
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