ffd75c2e0c
This reapplies commit 2d397beb00.
Fixes #44451.
Co-authored-by: Bjorn Neergaard <bneergaard@mirantis.com>
Signed-off-by: Albin Kerouanton <albinker@gmail.com>
Signed-off-by: Bjorn Neergaard <bneergaard@mirantis.com>
60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
package libnetwork
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import (
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"github.com/docker/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 ctrl *Controller
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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 {
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return
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}
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conds := []struct {
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ipVer iptables.IPVersion
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cond bool
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}{
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{ipVer: iptables.IPv4, cond: ctrl.iptablesEnabled()},
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{ipVer: iptables.IPv6, cond: ctrl.ip6tablesEnabled()},
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}
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for _, ipVerCond := range conds {
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cond := ipVerCond.cond
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if !cond {
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continue
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}
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ipVer := ipVerCond.ipVer
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iptable := iptables.GetIptable(ipVer)
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_, err := iptable.NewChain(userChain, iptables.Filter, false)
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if err != nil {
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logrus.WithError(err).Warnf("Failed to create %s %v chain", userChain, ipVer)
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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.WithError(err).Warnf("Failed to add the RETURN rule for %s %v", userChain, ipVer)
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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.WithError(err).Warnf("Failed to ensure the jump rule for %s %v", userChain, ipVer)
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}
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}
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}
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