95 lines
3.2 KiB
Go
95 lines
3.2 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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var rules []iptables.Rule
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proto := ipipProtocolName()
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rules = append(rules, iptables.NewIPv4Chain("filter", "KILO-IPIP"))
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rules = append(rules, iptables.NewIPv6Chain("filter", "KILO-IPIP"))
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rules = append(rules, iptables.NewIPv4Rule("filter", "INPUT", "-p", proto, "-m", "comment", "--comment", "Kilo: jump to IPIP chain", "-j", "KILO-IPIP"))
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rules = append(rules, iptables.NewIPv6Rule("filter", "INPUT", "-p", proto, "-m", "comment", "--comment", "Kilo: jump to IPIP chain", "-j", "KILO-IPIP"))
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for _, n := range nodes {
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// Accept encapsulated traffic from peers.
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rules = append(rules, iptables.NewRule(iptables.GetProtocol(n.IP), "filter", "KILO-IPIP", "-s", n.String(), "-m", "comment", "--comment", "Kilo: allow IPIP traffic", "-j", "ACCEPT"))
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}
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// Drop all other IPIP traffic.
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rules = append(rules, iptables.NewIPv4Rule("filter", "INPUT", "-p", proto, "-m", "comment", "--comment", "Kilo: reject other IPIP traffic", "-j", "DROP"))
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rules = append(rules, iptables.NewIPv6Rule("filter", "INPUT", "-p", proto, "-m", "comment", "--comment", "Kilo: reject other IPIP traffic", "-j", "DROP"))
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return rules
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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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