108 lines
2.9 KiB
Go
108 lines
2.9 KiB
Go
// Copyright 2019 the Kilo authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package encapsulation
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import (
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"fmt"
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"net"
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"github.com/squat/kilo/pkg/iproute"
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"github.com/squat/kilo/pkg/iptables"
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)
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// Strategy identifies which packets within a location should
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// be encapsulated.
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type Strategy string
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const (
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// Never indicates that no packets within a location
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// should be encapsulated.
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Never Strategy = "never"
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// CrossSubnet indicates that only packets that
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// traverse subnets within a location should be encapsulated.
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CrossSubnet Strategy = "crosssubnet"
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// Always indicates that all packets within a location
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// should be encapsulated.
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Always Strategy = "always"
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)
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// Interface can configure
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// the encapsulation interface, init itself,
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// get the encapsulation interface index,
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// set the interface IP address,
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// return the required IPTables rules,
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// return the encapsulation strategy,
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// and clean up any changes applied to the backend.
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type Interface interface {
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CleanUp() error
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Index() int
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Init(int) error
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Rules([]*net.IPNet) []iptables.Rule
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Set(*net.IPNet) error
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Strategy() Strategy
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}
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type ipip struct {
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iface int
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strategy Strategy
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}
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// NewIPIP returns an encapsulation that uses IPIP.
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func NewIPIP(strategy Strategy) Interface {
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return &ipip{strategy: strategy}
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}
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// CleanUp will remove any created IPIP devices.
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func (i *ipip) CleanUp() error {
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if err := iproute.DeleteAddresses(i.iface); err != nil {
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return nil
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}
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return iproute.RemoveInterface(i.iface)
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}
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// Index returns the index of the IPIP interface.
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func (i *ipip) Index() int {
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return i.iface
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}
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// Init initializes the IPIP interface.
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func (i *ipip) Init(base int) error {
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iface, err := iproute.NewIPIP(base)
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if err != nil {
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return fmt.Errorf("failed to create tunnel interface: %v", err)
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}
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if err := iproute.Set(iface, true); err != nil {
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return fmt.Errorf("failed to set tunnel interface up: %v", err)
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}
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i.iface = iface
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return nil
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}
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// Rules returns a set of iptables rules that are necessary
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// when traffic between nodes must be encapsulated.
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func (i *ipip) Rules(nodes []*net.IPNet) []iptables.Rule {
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return iptables.IPIPRules(nodes)
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}
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// Set sets the IP address of the IPIP interface.
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func (i *ipip) Set(cidr *net.IPNet) error {
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return iproute.SetAddress(i.iface, cidr)
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}
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// Strategy returns the configured strategy for encapsulation.
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func (i *ipip) Strategy() Strategy {
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return i.strategy
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}
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