Updated vendor for exported BuildArgs

vendor/github.com/docker/libnetwork/firewall_linux.go

@@ -0,0 +1,40 @@
+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)
+	}
+}