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pkg/mesh/routes.go: add flag for generic ACCEPT in FORWARD chain (#244)

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* pkg/mesh/routes.go: add flag for generic ACCEPT in FORWARD chain

Some linux distros or docker will set the default policy in the FORWARD
chain in the filter table to DROP. With the new ip-tables-forward-rules
flag a generic ACCEPT for all packages going from and to the pod subnet
is added to the FORWARD chain.

Signed-off-by: leonnicolas <leonloechner@gmx.de>

* Update cmd/kg/main.go

Co-authored-by: Lucas Servén Marín <lserven@gmail.com>

* Update cmd/kg/main.go

Co-authored-by: Lucas Servén Marín <lserven@gmail.com>
This commit is contained in:
leonnicolas
2021-09-30 15:39:06 +03:00
committed by GitHub
parent e2745b453f
commit 9b14c227a9
3 changed files with 56 additions and 48 deletions
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6
cmd/kg/main.go
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@@ -111,6 +111,7 @@ var (
port uint
subnet string
resyncPeriod time.Duration
iptablesForwardRule bool
prioritisePrivateAddr bool
printVersion bool
@@ -140,7 +141,8 @@ func init() {
cmd.Flags().UintVar(&port, "port", mesh.DefaultKiloPort, "The port over which WireGuard peers should communicate.")
cmd.Flags().StringVar(&subnet, "subnet", mesh.DefaultKiloSubnet.String(), "CIDR from which to allocate addresses for WireGuard interfaces.")
cmd.Flags().DurationVar(&resyncPeriod, "resync-period", 30*time.Second, "How often should the Kilo controllers reconcile?")
cmd.Flags().BoolVar(&prioritisePrivateAddr, "prioritise-private-addresses", false, "Prefer to assign a private IP address to the node's endpoint")
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.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))
@@ -236,7 +238,7 @@ func runRoot(_ *cobra.Command, _ []string) error {
return fmt.Errorf("backend %v unknown; possible values are: %s", backend, availableBackends)
}
m, err := mesh.New(b, enc, gr, hostname, uint32(port), s, local, cni, cniPath, iface, cleanUpIface, createIface, mtu, resyncPeriod, prioritisePrivateAddr, log.With(logger, "component", "kilo"))
m, err := mesh.New(b, enc, gr, hostname, uint32(port), s, local, cni, cniPath, iface, cleanUpIface, createIface, mtu, resyncPeriod, prioritisePrivateAddr, iptablesForwardRule, log.With(logger, "component", "kilo"))
if err != nil {
return fmt.Errorf("failed to create Kilo mesh: %v", err)
}