int do_veth(int argc, char **argv);
enum {
VETH_CMD_UNSPEC,
VETH_CMD_ADD,
VETH_CMD_DEL,
VETH_CMD_MAX
};
VETH_ATTR_UNSPEC,
VETH_ATTR_DEVNAME,
VETH_ATTR_PEERNAME,
VETH_ATTR_MAX