diff --git a/drivers/bridge/bridge.go b/drivers/bridge/bridge.go index 8896bd8483..ccdf204031 100644 --- a/drivers/bridge/bridge.go +++ b/drivers/bridge/bridge.go @@ -516,6 +516,13 @@ func (d *driver) CreateEndpoint(nid, eid types.UUID, epInfo driverapi.EndpointIn return err } + if !config.EnableUserlandProxy { + err = netlink.LinkSetHairpin(host, true) + if err != nil { + return err + } + } + // v4 address for the sandbox side pipe interface ip4, err := ipAllocator.RequestIP(n.bridge.bridgeIPv4, nil) if err != nil { diff --git a/iptables/iptables.go b/iptables/iptables.go index 4299a7e2b6..481013afab 100644 --- a/iptables/iptables.go +++ b/iptables/iptables.go @@ -44,9 +44,10 @@ var ( // Chain defines the iptables chain. type Chain struct { - Name string - Bridge string - Table Table + Name string + Bridge string + Table Table + HairpinMode bool } // ChainError is returned to represent errors during ip table operation. @@ -75,9 +76,10 @@ func initCheck() error { // NewChain adds a new chain to ip table. func NewChain(name, bridge string, table Table, hairpinMode bool) (*Chain, error) { c := &Chain{ - Name: name, - Bridge: bridge, - Table: table, + Name: name, + Bridge: bridge, + Table: table, + HairpinMode: hairpinMode, } if string(c.Table) == "" { @@ -151,12 +153,16 @@ func (c *Chain) Forward(action Action, ip net.IP, port int, proto, destAddr stri // value" by both iptables and ip6tables. daddr = "0/0" } - if output, err := Raw("-t", string(Nat), string(action), c.Name, + args := []string{"-t", string(Nat), string(action), c.Name, "-p", proto, "-d", daddr, "--dport", strconv.Itoa(port), "-j", "DNAT", - "--to-destination", net.JoinHostPort(destAddr, strconv.Itoa(destPort))); err != nil { + "--to-destination", net.JoinHostPort(destAddr, strconv.Itoa(destPort))} + if !c.HairpinMode { + args = append(args, "!", "-i", c.Bridge) + } + if output, err := Raw(args...); err != nil { return err } else if len(output) != 0 { return ChainError{Chain: "FORWARD", Output: output} diff --git a/iptables/iptables_test.go b/iptables/iptables_test.go index afb3587f1f..61257d0322 100644 --- a/iptables/iptables_test.go +++ b/iptables/iptables_test.go @@ -48,6 +48,7 @@ func TestForward(t *testing.T) { "--dport", strconv.Itoa(port), "-j", "DNAT", "--to-destination", dstAddr + ":" + strconv.Itoa(dstPort), + "!", "-i", natChain.Bridge, } if !Exists(natChain.Table, natChain.Name, dnatRule...) {