f99d5e8656
- Accept output traffic from all default routes through VPN interface - Accept output from all default routes to outbound subnets - Accept all input traffic on ports for all default routes - Add IP rules for all default routes
73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
package routing
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"net"
|
|
|
|
"github.com/qdm12/gluetun/internal/netlink"
|
|
)
|
|
|
|
var (
|
|
ErrRouteDefaultNotFound = errors.New("default route not found")
|
|
)
|
|
|
|
type DefaultRouteGetter interface {
|
|
DefaultRoutes() (defaultRoutes []DefaultRoute, err error)
|
|
}
|
|
|
|
type DefaultRoute struct {
|
|
NetInterface string
|
|
Gateway net.IP
|
|
AssignedIP net.IP
|
|
}
|
|
|
|
func (d DefaultRoute) String() string {
|
|
return fmt.Sprintf("interface %s, gateway %s and assigned IP %s",
|
|
d.NetInterface, d.Gateway, d.AssignedIP)
|
|
}
|
|
|
|
func (r *Routing) DefaultRoutes() (defaultRoutes []DefaultRoute, err error) {
|
|
routes, err := r.netLinker.RouteList(nil, netlink.FAMILY_ALL)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot list routes: %w", err)
|
|
}
|
|
|
|
for _, route := range routes {
|
|
if route.Dst == nil {
|
|
defaultRoute := DefaultRoute{
|
|
Gateway: route.Gw,
|
|
}
|
|
linkIndex := route.LinkIndex
|
|
link, err := r.netLinker.LinkByIndex(linkIndex)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot obtain link by index: for default route at index %d: %w", linkIndex, err)
|
|
}
|
|
attributes := link.Attrs()
|
|
defaultRoute.NetInterface = attributes.Name
|
|
|
|
defaultRoute.AssignedIP, err = r.assignedIP(defaultRoute.NetInterface)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot get assigned IP of %s: %w", defaultRoute.NetInterface, err)
|
|
}
|
|
|
|
r.logger.Info("default route found: " + defaultRoute.String())
|
|
defaultRoutes = append(defaultRoutes, defaultRoute)
|
|
}
|
|
}
|
|
|
|
if len(defaultRoutes) == 0 {
|
|
return nil, fmt.Errorf("%w: in %d route(s)", ErrRouteDefaultNotFound, len(routes))
|
|
}
|
|
|
|
return defaultRoutes, nil
|
|
}
|
|
|
|
func DefaultRoutesInterfaces(defaultRoutes []DefaultRoute) (interfaces []string) {
|
|
interfaces = make([]string, len(defaultRoutes))
|
|
for i := range defaultRoutes {
|
|
interfaces[i] = defaultRoutes[i].NetInterface
|
|
}
|
|
return interfaces
|
|
}
|