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package libnetwork
import (
"github.com/docker/libnetwork/iptables"
"github.com/sirupsen/logrus"
)
const userChain = "DOCKER-USER"
var (
ctrl *controller = nil
)
func setupArrangeUserFilterRule(c *controller) {
ctrl = c
iptables.OnReloaded(arrangeUserFilterRule)
}
// This chain allow users to configure firewall policies in a way that persists
// docker operations/restarts. Docker will not delete or modify any pre-existing
// rules from the DOCKER-USER filter chain.
// Note once DOCKER-USER chain is created, docker engine does not remove it when
// IPTableForwarding is disabled, because it contains rules configured by user that
// are beyond docker engine's control.
func arrangeUserFilterRule() {
if ctrl == nil || !ctrl.iptablesEnabled() {
return
}
// TODO IPv6 support
iptable := iptables.GetIptable(iptables.IPv4)
_, err := iptable.NewChain(userChain, iptables.Filter, false)
if err != nil {
logrus.Warnf("Failed to create %s chain: %v", userChain, err)
return
}
if err = iptable.AddReturnRule(userChain); err != nil {
logrus.Warnf("Failed to add the RETURN rule for %s: %v", userChain, err)
return
}
err = iptable.EnsureJumpRule("FORWARD", userChain)
if err != nil {
logrus.Warnf("Failed to ensure the jump rule for %s: %v", userChain, err)
}
}
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