forked from flannel-io/flannel
/
udp.go
91 lines (74 loc) · 2.14 KB
/
udp.go
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// Copyright 2015 flannel authors
//
// 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 udp
import (
"encoding/json"
"fmt"
"golang.org/x/net/context"
"github.com/coreos/flannel/backend"
"github.com/coreos/flannel/pkg/ip"
"github.com/coreos/flannel/subnet"
)
func init() {
backend.Register("udp", New)
}
const (
defaultPort = 8285
)
type UdpBackend struct {
sm subnet.Manager
extIface *backend.ExternalInterface
}
func New(sm subnet.Manager, extIface *backend.ExternalInterface) (backend.Backend, error) {
be := UdpBackend{
sm: sm,
extIface: extIface,
}
return &be, nil
}
func (be *UdpBackend) RegisterNetwork(ctx context.Context, netname string, config *subnet.Config) (backend.Network, error) {
cfg := struct {
Port int
}{
Port: defaultPort,
}
// Parse our configuration
if len(config.Backend) > 0 {
if err := json.Unmarshal(config.Backend, &cfg); err != nil {
return nil, fmt.Errorf("error decoding UDP backend config: %v", err)
}
}
// Acquire the lease form subnet manager
attrs := subnet.LeaseAttrs{
PublicIP: ip.FromIP(be.extIface.ExtAddr),
}
l, err := be.sm.AcquireLease(ctx, netname, &attrs)
switch err {
case nil:
case context.Canceled, context.DeadlineExceeded:
return nil, err
default:
return nil, fmt.Errorf("failed to acquire lease: %v", err)
}
// Tunnel's subnet is that of the whole overlay network (e.g. /16)
// and not that of the individual host (e.g. /24)
tunNet := ip.IP4Net{
IP: l.Subnet.IP,
PrefixLen: config.Network.PrefixLen,
}
return newNetwork(netname, be.sm, be.extIface, cfg.Port, tunNet, l)
}
func (_ *UdpBackend) Run(ctx context.Context) {
<-ctx.Done()
}