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moby--moby/libnetwork/firewall_linux.go

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package libnetwork
import (
"github.com/docker/libnetwork/iptables"
"github.com/sirupsen/logrus"
)
const userChain = "DOCKER-USER"
func (c *controller) arrangeUserFilterRule() {
c.Lock()
arrangeUserFilterRule()
c.Unlock()
iptables.OnReloaded(func() {
c.Lock()
arrangeUserFilterRule()
c.Unlock()
})
}
// 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.
func arrangeUserFilterRule() {
_, err := iptables.NewChain(userChain, iptables.Filter, false)
if err != nil {
logrus.Warnf("Failed to create %s chain: %v", userChain, err)
return
}
if err = iptables.AddReturnRule(userChain); err != nil {
logrus.Warnf("Failed to add the RETURN rule for %s: %v", userChain, err)
return
}
err = iptables.EnsureJumpRule("FORWARD", userChain)
if err != nil {
logrus.Warnf("Failed to ensure the jump rule for %s: %v", userChain, err)
}
}