/* Helper routine to generate a netlink.Route object from string descriptions */
func mkRoute(src, dst, dev, gw string) *netlink.Route {
_, dst_net, err := net.ParseCIDR(dst)
if err != nil {
log.Fatalf("failed to parse route destination %s: %s", dst, err)
}
route := netlink.Route{Src: net.ParseIP(extract_ip(src)), Dst: dst_net}
if dev != "" {
link, err := netlink.LinkByName(dev)
if err != nil {
log.Fatalf("failed to look up outgoing interface %s: %s", dev, err)
}
route.LinkIndex = link.Attrs().Index
}
if gw != "" {
route.Gw = net.ParseIP(gw)
}
return &route
}
// This code proposed for addition to the vishvananda/netlink library
// deserializeRoute decodes a binary netlink message into a Route struct
func deserializeRoute(m []byte) (netlink.Route, error) {
route := netlink.Route{}
msg := nl.DeserializeRtMsg(m)
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return route, err
}
route.Scope = netlink.Scope(msg.Scope)
native := nl.NativeEndian()
for _, attr := range attrs {
switch attr.Attr.Type {
case syscall.RTA_GATEWAY:
route.Gw = net.IP(attr.Value)
case syscall.RTA_PREFSRC:
route.Src = net.IP(attr.Value)
case syscall.RTA_DST:
route.Dst = &net.IPNet{
IP: attr.Value,
Mask: net.CIDRMask(int(msg.Dst_len), 8*len(attr.Value)),
}
case syscall.RTA_OIF:
routeIndex := int(native.Uint32(attr.Value[0:4]))
route.LinkIndex = routeIndex
}
}
return route, nil
}