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ntp: use specific reference ID when smoothing served time

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Set refid in server/broadcast packets to 127.127.1.255 when a time
smoothing offset is applied to the timestamps. This allows the clients
and administrators to detect that the server is not serving its best
estimate of the true time.
This commit is contained in:
Miroslav Lichvar
2015-06-22 11:09:31 +02:00
parent b9b896d8e7
commit ab1f01bacd
2 changed files with 10 additions and 8 deletions
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17
ntp_core.c
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@@ -789,8 +789,8 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
/* Get current smoothing offset when sending packet to a client */
if (SMT_IsEnabled() && (my_mode == MODE_SERVER || my_mode == MODE_BROADCAST)) {
smooth_time = 1;
smooth_offset = SMT_GetOffset(&local_transmit);
smooth_time = fabs(smooth_offset) > LCL_GetSysPrecisionAsQuantum();
/* Suppress leap second when smoothing and slew mode are enabled */
if (REF_GetLeapMode() == REF_LeapModeSlew &&
@@ -801,6 +801,14 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
smooth_offset = 0.0;
}
if (smooth_time) {
our_ref_id = NTP_REFID_SMOOTH;
UTI_AddDoubleToTimeval(&our_ref_time, smooth_offset, &our_ref_time);
UTI_AddDoubleToTimeval(local_rx, smooth_offset, &local_receive);
} else {
local_receive = *local_rx;
}
if (are_we_synchronised) {
leap = (int) leap_status;
} else {
@@ -828,13 +836,6 @@ transmit_packet(NTP_Mode my_mode, /* The mode this machine wants to be */
/* Now fill in timestamps */
if (smooth_time) {
UTI_AddDoubleToTimeval(&our_ref_time, smooth_offset, &our_ref_time);
UTI_AddDoubleToTimeval(local_rx, smooth_offset, &local_receive);
} else {
local_receive = *local_rx;
}
UTI_TimevalToInt64(&our_ref_time, &message.reference_ts, 0);
/* Originate - this comes from the last packet the source sent us */