81d6077fc2
This commit adds basic support to run in compatibility mode with Flannel. This allows clusters running Flannel as their principal networking solution to leverage some advances Kilo features. In certain Flannel setups, the clusters can even leverage muti-cloud. For this, the cluster needs to either run in a full mesh, or Flannel needs to use the API server's external IP address.
81 lines
2.1 KiB
Go
81 lines
2.1 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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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 encapsulator that uses IPIP.
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func NewIPIP(strategy Strategy) Encapsulator {
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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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// Gw returns the correct gateway IP associated with the given node.
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func (i *ipip) Gw(_, internal net.IP, _ *net.IPNet) net.IP {
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return internal
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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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