kilo/pkg/encapsulation/encapsulation.go

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// Copyright 2019 the Kilo 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 encapsulation
import (
"net"
"github.com/squat/kilo/pkg/iptables"
)
// Strategy identifies which packets within a location should
// be encapsulated.
type Strategy string
const (
// Never indicates that no packets within a location
// should be encapsulated.
Never Strategy = "never"
// CrossSubnet indicates that only packets that
// traverse subnets within a location should be encapsulated.
CrossSubnet Strategy = "crosssubnet"
// Always indicates that all packets within a location
// should be encapsulated.
Always Strategy = "always"
)
// Encapsulator can:
// * configure the encapsulation interface;
// * determine the gateway IP corresponding to a node;
// * get the encapsulation interface index;
// * set the interface IP address;
// * return the required IPTables rules;
// * return the encapsulation strategy; and
// * clean up any changes applied to the backend.
type Encapsulator interface {
CleanUp() error
Gw(net.IP, net.IP, *net.IPNet) net.IP
Index() int
Init(int) error
Rules([]*net.IPNet) []iptables.Rule
Set(*net.IPNet) error
Strategy() Strategy
}