pfctl has some issue with setting bandwidth specs to >=1000G that
I don't fully understand:

$ echo 'queue rootq on lo0 bandwidth 999999999K
    queue defq parent rootq bandwidth 8G default' | pfctl -nvf -
queue rootq on lo0 bandwidth 999999999K
queue defq parent rootq bandwidth 8G default

$ echo 'queue rootq on lo0 bandwidth 1000000000K
    queue defq parent rootq bandwidth 8G default' | pfctl -nvf -
queue rootq on lo0 bandwidth 1
queue defq parent rootq bandwidth 8G default

this only applies with unit specifiers, not raw numbers.

Worried about wraparounds with casts, I tried a separate multiplier
variable and checking for bps > (double)(LLONG-MAX / mult) but that
didn't help.

Unless someone has a better idea, the parser could be changed like
this to reject values causing the problem.

Index: parse.y
===================================================================
RCS file: /cvs/src/sbin/pfctl/parse.y,v
diff -u -p -r1.724 parse.y
--- parse.y	15 Jan 2026 09:23:37 -0000	1.724
+++ parse.y	19 Mar 2026 12:43:42 -0000
@@ -1606,7 +1606,7 @@ bandwidth	: STRING {
 				}
 			}
 			free($1);
-			if (bps < 0 || bps > (double)LLONG_MAX) {
+			if (bps < 0 || bps >= 1000000000000) {
 				yyerror("bandwidth number too big");
 				YYERROR;
 			}