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ntp: suggest clients to increase their polling interval

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When the poll value in a client request is smaller than the server's NTP
rate limiting interval, set poll in the response to the rate limiting
interval to suggest the client to increase its polling interval.

This follows ntpd as a server. No current client implementation seems to
be increasing its interval by the poll, but it may change in the future.
This commit is contained in:
Miroslav Lichvar
2017-06-16 12:16:17 +02:00
parent c5735ebfe9
commit 018a1c42b0
3 changed files with 21 additions and 2 deletions
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9
ntp_core.c
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@@ -1860,7 +1860,7 @@ NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
NTP_Mode pkt_mode, my_mode;
NTP_int64 *local_ntp_rx, *local_ntp_tx;
NTP_Local_Timestamp local_tx, *tx_ts;
int valid_auth, log_index, interleaved;
int valid_auth, log_index, interleaved, poll;
AuthenticationMode auth_mode;
uint32_t key_id;
@@ -1947,8 +1947,13 @@ NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_a
}
}
/* Suggest the client to increase its polling interval if it indicates
the interval is shorter than the rate limiting interval */
poll = CLG_GetNtpMinPoll();
poll = MAX(poll, message->poll);
/* Send a reply */
transmit_packet(my_mode, interleaved, message->poll, NTP_LVM_TO_VERSION(message->lvm),
transmit_packet(my_mode, interleaved, poll, NTP_LVM_TO_VERSION(message->lvm),
auth_mode, key_id, &message->receive_ts, &message->transmit_ts,
rx_ts, tx_ts, local_ntp_rx, NULL, remote_addr, local_addr);