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ntp: check RX and TX timestamp in interleaved client requests

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Clients sending packets in the interleaved mode are supposed to use
a different receive and transmit timestamp in order to reliably detect
the mode of the response. If an interleaved request with the receive
timestamp equal to the transmit timestamp is detected, respond in the
basic mode.
This commit is contained in:
Miroslav Lichvar 2018-03-05 10:15:42 +01:00
parent d2a96f5fbc
commit c6dd749687
1 changed files with 2 additions and 1 deletions
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3
ntp_core.c
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@ -2129,7 +2129,8 @@ NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
if (log_index >= 0) {
CLG_GetNtpTimestamps(log_index, &local_ntp_rx, &local_ntp_tx);
interleaved = !UTI_IsZeroNtp64(local_ntp_rx) &&
!UTI_CompareNtp64(&message->originate_ts, local_ntp_rx);
!UTI_CompareNtp64(&message->originate_ts, local_ntp_rx) &&
UTI_CompareNtp64(&message->receive_ts, &message->transmit_ts);
if (interleaved) {
UTI_Ntp64ToTimespec(local_ntp_tx, &local_tx.ts);