Classical IP over ATM  [include/linux/atmclip.h]

SIOCMKCLIP Create IP interface. edx should contain interface ID.
In case of success return value is ID of the new interface, otherwise return value is one of the following errno values:
-ENOMEM *to be documented*
-EEXIST Already exists.
-EPERM Operation not permitted because the command requires CAP_NET_ADMIN.