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Move iptable rules outside of create bridge

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This allows the user to toggle enabling and
disabling intercontainer communication when
they run the daemon.
This commit is contained in:
Michael Crosby 2013-10-24 09:08:50 -07:00 committed by Victor Vieux
parent e179a24ad5
commit 94e5081bac
2 changed files with 22 additions and 10 deletions
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5
iptables/iptables.go
View file

@ -92,6 +92,11 @@ func (c *Chain) Remove() error {
return nil
}
// Check if an existing rule exists
func Exists(args ...string) bool {
return Raw(append([]string{"-C"}, args...)...) == nil
}
func Raw(args ...string) error {
path, err := exec.LookPath("iptables")
if err != nil {

27
network.go
View file

@ -145,16 +145,6 @@ func CreateBridgeIface(config *DaemonConfig) error {
"!", "-d", ifaceAddr, "-j", "MASQUERADE"); err != nil {
return fmt.Errorf("Unable to enable network bridge NAT: %s", err)
}
if !config.InterContainerCommunication {
utils.Debugf("Disable inter-container communication")
if err := iptables.Raw("-A", "FORWARD", "-i", config.BridgeIface, "-o", config.BridgeIface, "-j", "DROP"); err != nil {
return fmt.Errorf("Unable to prevent intercontainer communication: %s", err)
}
} else {
utils.Debugf("Enable inter-container communication")
iptables.Raw("-D", "FORWARD", "-i", config.BridgeIface, "-o", config.BridgeIface, "-j", "DROP")
}
}
return nil
}
@ -659,6 +649,23 @@ func newNetworkManager(config *DaemonConfig) (*NetworkManager, error) {
}
network := addr.(*net.IPNet)
// Configure iptables for link support
if config.EnableIptables {
args := []string{"FORWARD", "-i", config.BridgeIface, "-o", config.BridgeIface, "-j", "DROP"}
if !config.InterContainerCommunication {
if !iptables.Exists(args...) {
utils.Debugf("Disable inter-container communication")
if err := iptables.Raw(append([]string{"-A"}, args...)...); err != nil {
return nil, fmt.Errorf("Unable to prevent intercontainer communication: %s", err)
}
}
} else {
utils.Debugf("Enable inter-container communication")
iptables.Raw(append([]string{"-D"}, args...)...)
}
}
ipAllocator := newIPAllocator(network)
tcpPortAllocator, err := newPortAllocator()