net/sntp.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * (C) Masami Komiya <mkomiya@sonare.it> 2005
   4  */
   5
   6 #ifndef __SNTP_H__
   7 #define __SNTP_H__
   8
   9 #define NTP_SERVICE_PORT        123
  10 #define SNTP_PACKET_LEN         48
  11
  12
  13 /* Leap Indicator */
  14 #define NTP_LI_NOLEAP           0x0
  15 #define NTP_LI_61SECS           0x1
  16 #define NTP_LI_59SECS           0x2
  17 #define NTP_LI_ALARM            0x3
  18
  19 /* Version */
  20
  21 #define NTP_VERSION             4
  22
  23 /* Mode */
  24 #define NTP_MODE_RESERVED       0
  25 #define NTP_MODE_SYMACTIVE      1       /* Symmetric Active */
  26 #define NTP_MODE_SYMPASSIVE     2       /* Symmetric Passive */
  27 #define NTP_MODE_CLIENT         3
  28 #define NTP_MODE_SERVER         4
  29 #define NTP_MODE_BROADCAST      5
  30 #define NTP_MODE_NTPCTRL        6       /* Reserved for NTP control message */
  31 #define NTP_MODE_PRIVATE        7       /* Reserved for private use */
  32
  33 struct sntp_pkt_t {
  34 #if __LITTLE_ENDIAN
  35         uchar mode:3;
  36         uchar vn:3;
  37         uchar li:2;
  38 #else
  39         uchar li:2;
  40         uchar vn:3;
  41         uchar mode:3;
  42 #endif
  43         uchar stratum;
  44         uchar poll;
  45         uchar precision;
  46         uint root_delay;
  47         uint root_dispersion;
  48         uint reference_id;
  49         unsigned long long reference_timestamp;
  50         unsigned long long originate_timestamp;
  51         unsigned long long receive_timestamp;
  52         unsigned long long transmit_timestamp;
  53 } __attribute__((packed));
  54
  55 void sntp_start(void);  /* Begin SNTP */
  56
  57 #endif /* __SNTP_H__ */