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-rw-r--r--networking/ntpd.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/networking/ntpd.c b/networking/ntpd.c
index 465c74d..48dc1c3 100644
--- a/networking/ntpd.c
+++ b/networking/ntpd.c
@@ -2238,6 +2238,13 @@ recv_and_process_client_pkt(void /*int fd*/)
from = xzalloc(to->len);
size = recv_from_to(G_listen_fd, &msg, sizeof(msg), MSG_DONTWAIT, from, &to->u.sa, to->len);
+
+ /* "ntpq -p" (4.2.8p13) sends a 12-byte NTPv2 request:
+ * m_status is 0x16: leap:0 version:2 mode:6(reserved1)
+ * https://docs.ntpsec.org/latest/mode6.html
+ * We don't support this.
+ */
+
#if ENABLE_FEATURE_NTP_AUTH
if (size != NTP_MSGSIZE_NOAUTH && size != NTP_MSGSIZE_MD5_AUTH && size != NTP_MSGSIZE_SHA1_AUTH)
#else