110 lines
2.1 KiB
C
110 lines
2.1 KiB
C
#ifndef _IPXE_NTP_H
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#define _IPXE_NTP_H
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/** @file
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*
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* Network Time Protocol
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdint.h>
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#include <ipxe/in.h>
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#include <ipxe/interface.h>
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/** NTP port */
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#define NTP_PORT 123
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/** An NTP short-format timestamp */
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struct ntp_short {
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/** Seconds */
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uint16_t seconds;
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/** Fraction of a second */
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uint16_t fraction;
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} __attribute__ (( packed ));
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/** An NTP timestamp */
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struct ntp_timestamp {
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/** Seconds */
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uint32_t seconds;
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/** Fraction of a second */
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uint32_t fraction;
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} __attribute__ (( packed ));
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/** An NTP reference identifier */
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union ntp_id {
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/** Textual identifier */
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char text[4];
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/** IPv4 address */
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struct in_addr in;
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/** Opaque integer */
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uint32_t opaque;
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};
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/** An NTP header */
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struct ntp_header {
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/** Flags */
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uint8_t flags;
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/** Stratum */
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uint8_t stratum;
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/** Polling rate */
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int8_t poll;
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/** Precision */
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int8_t precision;
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/** Root delay */
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struct ntp_short delay;
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/** Root dispersion */
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struct ntp_short dispersion;
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/** Reference clock identifier */
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union ntp_id id;
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/** Reference timestamp */
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struct ntp_timestamp reference;
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/** Originate timestamp */
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struct ntp_timestamp originate;
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/** Receive timestamp */
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struct ntp_timestamp receive;
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/** Transmit timestamp */
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struct ntp_timestamp transmit;
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} __attribute__ (( packed ));
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/** Leap second indicator: unknown */
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#define NTP_FL_LI_UNKNOWN 0xc0
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/** NTP version: 1 */
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#define NTP_FL_VN_1 0x20
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/** NTP mode: client */
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#define NTP_FL_MODE_CLIENT 0x03
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/** NTP mode: server */
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#define NTP_FL_MODE_SERVER 0x04
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/** NTP mode mask */
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#define NTP_FL_MODE_MASK 0x07
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/** NTP timestamp for start of Unix epoch */
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#define NTP_EPOCH 2208988800UL
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/** NTP fraction of a second magic value
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*
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* This is a policy decision.
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*/
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#define NTP_FRACTION_MAGIC 0x69505845UL
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/** NTP minimum retransmission timeout
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*
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* This is a policy decision.
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*/
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#define NTP_MIN_TIMEOUT ( 1 * TICKS_PER_SEC )
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/** NTP maximum retransmission timeout
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*
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* This is a policy decision.
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*/
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#define NTP_MAX_TIMEOUT ( 10 * TICKS_PER_SEC )
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extern int start_ntp ( struct interface *job, const char *hostname );
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#endif /* _IPXE_NTP_H */
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