NLA_TYPE_MASK
#define __nla_type(x) ((__u16)((x) & NLA_TYPE_MASK & ~DRBD_GENLA_F_MANDATORY))
return nla->nla_type & NLA_TYPE_MASK;
return nla->nla_type & NLA_TYPE_MASK;
return attr->nla_type & NLA_TYPE_MASK;