chore(netlink): define own types with minimal fields

- Allow to swap `github.com/vishvananda/netlink`
- Allow to add build tags for each platform
- One step closer to development on non-Linux platforms

internal/netlink/route.go

@@ -1,22 +1,74 @@
 package netlink
 
-import "github.com/vishvananda/netlink"
+import (
+	"net/netip"
 
-type Route = netlink.Route
+	"github.com/vishvananda/netlink"
+)
 
-func (n *NetLink) RouteList(link Link, family int) (
+type Route struct {
+	LinkIndex int
+	Dst       netip.Prefix
+	Src       netip.Addr
+	Gw        netip.Addr
+	Priority  int
+	Family    int
+	Table     int
+	Type      int
+}
+
+func (n *NetLink) RouteList(link *Link, family int) (
 	routes []Route, err error) {
-	return netlink.RouteList(link, family)
+	netlinkLink := linkToNetlinkLink(link)
+	netlinkRoutes, err := netlink.RouteList(netlinkLink, family)
+	if err != nil {
+		return nil, err
+	}
+
+	routes = make([]Route, len(netlinkRoutes))
+	for i := range netlinkRoutes {
+		routes[i] = netlinkRouteToRoute(netlinkRoutes[i])
+	}
+	return routes, nil
 }
 
-func (n *NetLink) RouteAdd(route *Route) error {
-	return netlink.RouteAdd(route)
+func (n *NetLink) RouteAdd(route Route) error {
+	netlinkRoute := routeToNetlinkRoute(route)
+	return netlink.RouteAdd(&netlinkRoute)
 }
 
-func (n *NetLink) RouteDel(route *Route) error {
-	return netlink.RouteDel(route)
+func (n *NetLink) RouteDel(route Route) error {
+	netlinkRoute := routeToNetlinkRoute(route)
+	return netlink.RouteDel(&netlinkRoute)
 }
 
-func (n *NetLink) RouteReplace(route *Route) error {
-	return netlink.RouteReplace(route)
+func (n *NetLink) RouteReplace(route Route) error {
+	netlinkRoute := routeToNetlinkRoute(route)
+	return netlink.RouteReplace(&netlinkRoute)
+}
+
+func netlinkRouteToRoute(netlinkRoute netlink.Route) (route Route) {
+	return Route{
+		LinkIndex: netlinkRoute.LinkIndex,
+		Dst:       netIPNetToNetipPrefix(netlinkRoute.Dst),
+		Src:       netIPToNetipAddress(netlinkRoute.Src),
+		Gw:        netIPToNetipAddress(netlinkRoute.Gw),
+		Priority:  netlinkRoute.Priority,
+		Family:    netlinkRoute.Family,
+		Table:     netlinkRoute.Table,
+		Type:      netlinkRoute.Type,
+	}
+}
+
+func routeToNetlinkRoute(route Route) (netlinkRoute netlink.Route) {
+	return netlink.Route{
+		LinkIndex: route.LinkIndex,
+		Dst:       netipPrefixToIPNet(route.Dst),
+		Src:       netipAddrToNetIP(route.Src),
+		Gw:        netipAddrToNetIP(route.Gw),
+		Priority:  route.Priority,
+		Family:    route.Family,
+		Table:     route.Table,
+		Type:      route.Type,
+	}
 }