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