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|
package osl
import (
"fmt"
"net"
"github.com/docker/libnetwork/types"
"github.com/vishvananda/netlink"
)
func (n *networkNamespace) Gateway() net.IP {
n.Lock()
defer n.Unlock()
return n.gw
}
func (n *networkNamespace) GatewayIPv6() net.IP {
n.Lock()
defer n.Unlock()
return n.gwv6
}
func (n *networkNamespace) StaticRoutes() []*types.StaticRoute {
n.Lock()
defer n.Unlock()
routes := make([]*types.StaticRoute, len(n.staticRoutes))
for i, route := range n.staticRoutes {
r := route.GetCopy()
routes[i] = r
}
return routes
}
func (n *networkNamespace) setGateway(gw net.IP) {
n.Lock()
n.gw = gw
n.Unlock()
}
func (n *networkNamespace) setGatewayIPv6(gwv6 net.IP) {
n.Lock()
n.gwv6 = gwv6
n.Unlock()
}
func (n *networkNamespace) SetGateway(gw net.IP) error {
// Silently return if the gateway is empty
if len(gw) == 0 {
return nil
}
err := n.programGateway(gw, true)
if err == nil {
n.setGateway(gw)
}
return err
}
func (n *networkNamespace) UnsetGateway() error {
gw := n.Gateway()
// Silently return if the gateway is empty
if len(gw) == 0 {
return nil
}
err := n.programGateway(gw, false)
if err == nil {
n.setGateway(net.IP{})
}
return err
}
func (n *networkNamespace) programGateway(gw net.IP, isAdd bool) error {
gwRoutes, err := n.nlHandle.RouteGet(gw)
if err != nil {
return fmt.Errorf("route for the gateway %s could not be found: %v", gw, err)
}
var linkIndex int
for _, gwRoute := range gwRoutes {
if gwRoute.Gw == nil {
linkIndex = gwRoute.LinkIndex
break
}
}
if linkIndex == 0 {
return fmt.Errorf("Direct route for the gateway %s could not be found", gw)
}
if isAdd {
return n.nlHandle.RouteAdd(&netlink.Route{
Scope: netlink.SCOPE_UNIVERSE,
LinkIndex: linkIndex,
Gw: gw,
})
}
return n.nlHandle.RouteDel(&netlink.Route{
Scope: netlink.SCOPE_UNIVERSE,
LinkIndex: linkIndex,
Gw: gw,
})
}
// Program a route in to the namespace routing table.
func (n *networkNamespace) programRoute(path string, dest *net.IPNet, nh net.IP) error {
gwRoutes, err := n.nlHandle.RouteGet(nh)
if err != nil {
return fmt.Errorf("route for the next hop %s could not be found: %v", nh, err)
}
return n.nlHandle.RouteAdd(&netlink.Route{
Scope: netlink.SCOPE_UNIVERSE,
LinkIndex: gwRoutes[0].LinkIndex,
Gw: nh,
Dst: dest,
})
}
// Delete a route from the namespace routing table.
func (n *networkNamespace) removeRoute(path string, dest *net.IPNet, nh net.IP) error {
gwRoutes, err := n.nlHandle.RouteGet(nh)
if err != nil {
return fmt.Errorf("route for the next hop could not be found: %v", err)
}
return n.nlHandle.RouteDel(&netlink.Route{
Scope: netlink.SCOPE_UNIVERSE,
LinkIndex: gwRoutes[0].LinkIndex,
Gw: nh,
Dst: dest,
})
}
func (n *networkNamespace) SetGatewayIPv6(gwv6 net.IP) error {
// Silently return if the gateway is empty
if len(gwv6) == 0 {
return nil
}
err := n.programGateway(gwv6, true)
if err == nil {
n.setGatewayIPv6(gwv6)
}
return err
}
func (n *networkNamespace) UnsetGatewayIPv6() error {
gwv6 := n.GatewayIPv6()
// Silently return if the gateway is empty
if len(gwv6) == 0 {
return nil
}
err := n.programGateway(gwv6, false)
if err == nil {
n.Lock()
n.gwv6 = net.IP{}
n.Unlock()
}
return err
}
func (n *networkNamespace) AddStaticRoute(r *types.StaticRoute) error {
err := n.programRoute(n.nsPath(), r.Destination, r.NextHop)
if err == nil {
n.Lock()
n.staticRoutes = append(n.staticRoutes, r)
n.Unlock()
}
return err
}
func (n *networkNamespace) RemoveStaticRoute(r *types.StaticRoute) error {
err := n.removeRoute(n.nsPath(), r.Destination, r.NextHop)
if err == nil {
n.Lock()
lastIndex := len(n.staticRoutes) - 1
for i, v := range n.staticRoutes {
if v == r {
// Overwrite the route we're removing with the last element
n.staticRoutes[i] = n.staticRoutes[lastIndex]
// Shorten the slice to trim the extra element
n.staticRoutes = n.staticRoutes[:lastIndex]
break
}
}
n.Unlock()
}
return err
}
|
