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Make dropping of other IPIP traffic optional

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This commit is contained in:
Alex Stockinger 2022-06-28 16:12:30 +00:00
parent cb238c85a1
commit c539a8bf1c
2 changed files with 13 additions and 8 deletions
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4
cmd/kg/main.go
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@ -115,6 +115,7 @@ var (
resyncPeriod time.Duration
iptablesForwardRule bool
prioritisePrivateAddr bool
dropOtherIpIpTraffic bool
printVersion bool
logLevel string
@ -145,6 +146,7 @@ func init() {
cmd.Flags().DurationVar(&resyncPeriod, "resync-period", 30*time.Second, "How often should the Kilo controllers reconcile?")
cmd.Flags().BoolVar(&iptablesForwardRule, "iptables-forward-rules", false, "Add default accept rules to the FORWARD chain in iptables. Warning: this may break firewalls with a deny all policy and is potentially insecure!")
cmd.Flags().BoolVar(&prioritisePrivateAddr, "prioritise-private-addresses", false, "Prefer to assign a private IP address to the node's endpoint.")
cmd.Flags().BoolVar(&dropOtherIpIpTraffic, "drop-other-ipip-traffic", true, "Drop other IP-over-IP traffic (not available in compatibility mode).")
cmd.PersistentFlags().BoolVar(&printVersion, "version", false, "Print version and exit")
cmd.PersistentFlags().StringVar(&logLevel, "log-level", logLevelInfo, fmt.Sprintf("Log level to use. Possible values: %s", availableLogLevels))
@ -216,7 +218,7 @@ func runRoot(_ *cobra.Command, _ []string) error {
case "cilium":
enc = encapsulation.NewCilium(e)
default:
enc = encapsulation.NewIPIP(e)
enc = encapsulation.NewIPIP(e, dropOtherIpIpTraffic)
}
gr := mesh.Granularity(granularity)

7
pkg/encapsulation/ipip.go
View File

@ -25,11 +25,12 @@ import (
type ipip struct {
iface int
strategy Strategy
dropOtherIpIpTraffic bool
}
// NewIPIP returns an encapsulator that uses IPIP.
func NewIPIP(strategy Strategy) Encapsulator {
return &ipip{strategy: strategy}
func NewIPIP(strategy Strategy, dropOtherIpIpTraffic bool) Encapsulator {
return &ipip{strategy: strategy, dropOtherIpIpTraffic: dropOtherIpIpTraffic}
}
// CleanUp will remove any created IPIP devices.
@ -76,9 +77,11 @@ func (i *ipip) Rules(nodes []*net.IPNet) []iptables.Rule {
// Accept encapsulated traffic from peers.
rules = append(rules, iptables.NewRule(iptables.GetProtocol(n.IP), "filter", "KILO-IPIP", "-s", n.String(), "-m", "comment", "--comment", "Kilo: allow IPIP traffic", "-j", "ACCEPT"))
}
if i.dropOtherIpIpTraffic {
// Drop all other IPIP traffic.
rules = append(rules, iptables.NewIPv4Rule("filter", "INPUT", "-p", proto, "-m", "comment", "--comment", "Kilo: reject other IPIP traffic", "-j", "DROP"))
rules = append(rules, iptables.NewIPv6Rule("filter", "INPUT", "-p", proto, "-m", "comment", "--comment", "Kilo: reject other IPIP traffic", "-j", "DROP"))
}
return rules
}