firewalld ssh restrict

Hi, I red man firewalld.richlanguage really focussed and some searched webpages and I really don't know how to restrict ssh with systemd like from 2 sources ok, other not ok? a.b.c.d > ssh OK b.c.d.a > ssh OK x.x.x.x (everyone else) > REJECT, DROP, whatever. Do You have any ideas? Thanks for reply. m.