0189dac7d8
Rework handling of late HW TX timestamps. Instead of suspending reading from client-only sockets that have HW TX timestamping enabled, save the whole response if it is valid and a HW TX timestamp was received for the source before. When the timestamp is received, or the configurable timeout is reached, process the saved response again, but skip the authentication test as the NTS code allows only one response per request. Only one valid response per source can be saved. If a second valid response is received while waiting for the timestamp, process both responses immediately in the order they were received. The main advantage of this approach is that it works on all sockets, i.e. even in the symmetric mode and with NTP-over-PTP, and the kernel does not need to buffer invalid responses.
43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/*
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chronyd/chronyc - Programs for keeping computer clocks accurate.
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**********************************************************************
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* Copyright (C) Miroslav Lichvar 2016
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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**********************************************************************
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=======================================================================
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This is the header file for the Linux-specific NTP socket I/O bits.
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*/
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#ifndef GOT_NTP_IO_LINUX_H
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#define GOT_NTP_IO_LINUX_H
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#include "socket.h"
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extern void NIO_Linux_Initialise(void);
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extern void NIO_Linux_Finalise(void);
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extern int NIO_Linux_SetTimestampSocketOptions(int sock_fd, int client_only, int *events);
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extern int NIO_Linux_ProcessMessage(SCK_Message *message, NTP_Local_Address *local_addr,
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NTP_Local_Timestamp *local_ts, int event);
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extern void NIO_Linux_RequestTxTimestamp(SCK_Message *message, int sock_fd);
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#endif
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