Add comment about cookie sizes

(cherry picked from commit 304df53991)
2020-11-27 10:20:40 +11:00
parent 81e5877520
commit 28f1cbb007
1 changed files with 4 additions and 0 deletions
@@ -193,6 +193,10 @@ fromwire_opt(ARGS_FROMWIRE) {
 			isc_region_consume(&sregion, length);
 			break;
 		case DNS_OPT_COOKIE:
+			/*
+			 * Client cookie alone has length 8.
+			 * Client + server cookie is 8 + [8..32].
+			 */
 			if (length != 8 && (length < 16 || length > 40)) {
 				return (DNS_R_OPTERR);
 			}