server: add zebra api support to configure linux network stack

Install route information to linux network stack via quagga's zebra.

$ gobgpd --enable-zapi

By default, 'unix:/var/run/quagga/zserv.api' for is used for zapi
endpoint. It's not the case in your environment, use '--zapi-url'
option.

Note that only ipv4 support now.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

1 files changed, 89 insertions, 0 deletions

diff --git a/server/zapi.go b/server/zapi.go
new file mode 100644
index 00000000..bd80dba9
--- /dev/null
+++ b/server/zapi.go
@@ -0,0 +1,89 @@
+// 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 (
+	"github.com/osrg/gobgp/packet"
+	"github.com/osrg/gobgp/table"
+	zebra "github.com/osrg/gozebra"
+	"net"
+	"strconv"
+	"strings"
+)
+
+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 {
+	var command zebra.API_TYPE
+	switch path.GetRouteFamily() {
+	case bgp.RF_IPv4_UC:
+		if path.IsWithdraw == true {
+			command = zebra.IPV4_ROUTE_DELETE
+		} else {
+			command = zebra.IPV4_ROUTE_ADD
+		}
+	case bgp.RF_IPv6_UC:
+		if path.IsWithdraw == true {
+			command = zebra.IPV6_ROUTE_DELETE
+		} else {
+			command = zebra.IPV6_ROUTE_ADD
+		}
+	default:
+		return nil
+	}
+
+	l := strings.SplitN(path.GetNlri().String(), "/", 2)
+	plen, _ := strconv.Atoi(l[1])
+	med, _ := path.GetMed()
+	return &zebra.Message{
+		Header: zebra.Header{
+			Command: command,
+		},
+		Body: &zebra.IPv4RouteBody{
+			Type:         zebra.ROUTE_BGP,
+			SAFI:         zebra.SAFI_UNICAST,
+			Message:      zebra.MESSAGE_NEXTHOP,
+			Prefix:       net.ParseIP(l[0]),
+			PrefixLength: uint8(plen),
+			Nexthops:     []net.IP{path.GetNexthop()},
+			Metric:       med,
+		},
+	}
+}
+
+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) {
+}