Let ejabberd_c2s handle <session/> IQ

This fixes the counting of incoming stanzas for stream management.

src/ejabberd_c2s.erl

@@ -448,6 +448,13 @@ handle_authenticated_packet(Pkt, #{lserver := LServer, jid := JID,
     case Pkt2 of
 	drop ->
 	    State2;
+	#iq{type = set, sub_els = [_]} ->
+	    case xmpp:get_subtag(Pkt1, #xmpp_session{}) of
+		#xmpp_session{} ->
+		    send(State2, xmpp:make_iq_result(Pkt1));
+		_ ->
+		    check_privacy_then_route(State2, Pkt1)
+	    end;
 	#presence{to = #jid{luser = LUser, lserver = LServer,
 			    lresource = <<"">>}} ->
 	    process_self_presence(State2, Pkt2);

src/xmpp_stream_in.erl

@@ -577,20 +577,9 @@ process_unauthenticated_packet(Pkt, #{mod := Mod} = State) ->
     end.
 
 -spec process_authenticated_packet(xmpp_element(), state()) -> state().
-process_authenticated_packet(Pkt, #{xmlns := NS, mod := Mod} = State) ->
+process_authenticated_packet(Pkt, #{mod := Mod} = State) ->
     Pkt1 = set_lang(Pkt, State),
     case set_from_to(Pkt1, State) of
-	{ok, #iq{type = set, sub_els = [_]} = Pkt2} when NS == ?NS_CLIENT ->
-	    case xmpp:get_subtag(Pkt2, #xmpp_session{}) of
-		#xmpp_session{} ->
-		    send_pkt(State, xmpp:make_iq_result(Pkt2));
-		_ ->
-		    try Mod:handle_authenticated_packet(Pkt2, State)
-		    catch _:undef ->
-			    Err = xmpp:err_service_unavailable(),
-			    send_error(State, Pkt, Err)
-		    end
-	    end;
 	{ok, Pkt2} ->
 	    try Mod:handle_authenticated_packet(Pkt2, State)
 	    catch _:undef ->