The RACROUTE REQUEST=LIST selection exit must be named ICHRLX02.

This exit must be reentrant and is invoked in supervisor state, under protection key 0, with no locks held.

The exit can have any RMODE, but AMODE should be AMODE(31) or AMODE(ANY) for the best use of virtual storage and best RACF® performance.

z/OS Security Server RACF Data Areas contains a mapping of the RACROUTE REQUEST=LIST exit parameter list, RLX2P.