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Add ability to alias any interface in a sanbox

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New load balancing code will require ability to add aliases to
load-balncer sandboxes.  So this broadens the OSL interface to allow
adding aliases to any interface, along with the facility to get the
loopback interface's name based on the OS.

Signed-off-by: Chris Telfer <ctelfer@docker.com>
This commit is contained in:
Chris Telfer 2018-04-09 23:58:51 -04:00
parent f2c6009583
commit 78b684a24a
3 changed files with 19 additions and 10 deletions
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12
libnetwork/osl/namespace_linux.go
View file

@ -358,16 +358,20 @@ func (n *networkNamespace) loopbackUp() error {
return n.nlHandle.LinkSetUp(iface)
}
func (n *networkNamespace) AddLoopbackAliasIP(ip *net.IPNet) error {
iface, err := n.nlHandle.LinkByName("lo")
func (n *networkNamespace) GetLoopbackIfaceName() string {
return "lo"
}
func (n *networkNamespace) AddAliasIP(ifName string, ip *net.IPNet) error {
iface, err := n.nlHandle.LinkByName(ifName)
if err != nil {
return err
}
return n.nlHandle.AddrAdd(iface, &netlink.Addr{IPNet: ip})
}
func (n *networkNamespace) RemoveLoopbackAliasIP(ip *net.IPNet) error {
iface, err := n.nlHandle.LinkByName("lo")
func (n *networkNamespace) RemoveAliasIP(ifName string, ip *net.IPNet) error {
iface, err := n.nlHandle.LinkByName(ifName)
if err != nil {
return err
}

11
libnetwork/osl/sandbox.go
View file

@ -32,11 +32,14 @@ type Sandbox interface {
// Unset the previously set default IPv6 gateway in the sandbox
UnsetGatewayIPv6() error
// AddLoopbackAliasIP adds the passed IP address to the sandbox loopback interface
AddLoopbackAliasIP(ip *net.IPNet) error
// GetLoopbackIfaceName returns the name of the loopback interface
GetLoopbackIfaceName() string
// RemoveLoopbackAliasIP removes the passed IP address from the sandbox loopback interface
RemoveLoopbackAliasIP(ip *net.IPNet) error
// AddAliasIP adds the passed IP address to the named interface
AddAliasIP(ifName string, ip *net.IPNet) error
// RemoveAliasIP removes the passed IP address from the named interface
RemoveAliasIP(ifName string, ip *net.IPNet) error
// Add a static route to the sandbox.
AddStaticRoute(*types.StaticRoute) error

6
libnetwork/sandbox.go
View file

@ -744,7 +744,8 @@ func releaseOSSboxResources(osSbox osl.Sandbox, ep *endpoint) {
ep.Unlock()
if len(vip) != 0 {
if err := osSbox.RemoveLoopbackAliasIP(&net.IPNet{IP: vip, Mask: net.CIDRMask(32, 32)}); err != nil {
loopName := osSbox.GetLoopbackIfaceName()
if err := osSbox.RemoveAliasIP(loopName, &net.IPNet{IP: vip, Mask: net.CIDRMask(32, 32)}); err != nil {
logrus.Warnf("Remove virtual IP %v failed: %v", vip, err)
}
}
@ -862,7 +863,8 @@ func (sb *sandbox) populateNetworkResources(ep *endpoint) error {
}
if len(ep.virtualIP) != 0 {
err := sb.osSbox.AddLoopbackAliasIP(&net.IPNet{IP: ep.virtualIP, Mask: net.CIDRMask(32, 32)})
loopName := sb.osSbox.GetLoopbackIfaceName()
err := sb.osSbox.AddAliasIP(loopName, &net.IPNet{IP: ep.virtualIP, Mask: net.CIDRMask(32, 32)})
if err != nil {
return fmt.Errorf("failed to add virtual IP %v: %v", ep.virtualIP, err)
}