ntp.h

网络时间协议NTP 源码 版本v4.2.0b 该源码用于linux平台下

#define MIN_MAC_LEN	3 * sizeof(u_int32)	/* DES */
#define MAX_MAC_LEN	5 * sizeof(u_int32)	/* MD5 */

	/*
	 * The length of the packet less MAC must be a multiple of 64
	 * with an RSA modulus and Diffie-Hellman prime of 64 octets
	 * and maximum host name of 128 octets, the maximum autokey
	 * command is 152 octets and maximum autokey response is 460
	 * octets. A packet can contain no more than one command and one
	 * response, so the maximum total extension field length is 672
	 * octets. But, to handle humungus certificates, the bank must
	 * be broke.
	 */
#ifdef OPENSSL
	u_int32	exten[NTP_MAXEXTEN / 4]; /* max extension field */
#else /* OPENSSL */
	u_int32	exten[1];	/* misused */
#endif /* OPENSSL */
	u_char	mac[MAX_MAC_LEN]; /* mac */
};

/*
 * Stuff for extracting things from li_vn_mode
 */
#define	PKT_MODE(li_vn_mode)	((u_char)((li_vn_mode) & 0x7))
#define	PKT_VERSION(li_vn_mode)	((u_char)(((li_vn_mode) >> 3) & 0x7))
#define	PKT_LEAP(li_vn_mode)	((u_char)(((li_vn_mode) >> 6) & 0x3))

/*
 * Stuff for putting things back into li_vn_mode
 */
#define	PKT_LI_VN_MODE(li, vn, md) \
	((u_char)((((li) << 6) & 0xc0) | (((vn) << 3) & 0x38) | ((md) & 0x7)))


/*
 * Dealing with stratum.  0 gets mapped to 16 incoming, and back to 0
 * on output.
 */
#define	PKT_TO_STRATUM(s)	((u_char)(((s) == (STRATUM_PKT_UNSPEC)) ?\
				(STRATUM_UNSPEC) : (s)))

#define	STRATUM_TO_PKT(s)	((u_char)(((s) == (STRATUM_UNSPEC)) ?\
				(STRATUM_PKT_UNSPEC) : (s)))

/*
 * Event codes. Used for reporting errors/events to the control module
 */
#define	PEER_EVENT	0x080	/* this is a peer event */
#define CRPT_EVENT	0x100	/* this is a crypto event */

/*
 * System event codes
 */
#define	EVNT_UNSPEC	0	/* unspecified */
#define	EVNT_SYSRESTART	1	/* system restart */
#define	EVNT_SYSFAULT	2	/* wsystem or hardware fault */
#define	EVNT_SYNCCHG	3	/* new leap or synch change */
#define	EVNT_PEERSTCHG	4	/* new source or stratum */
#define	EVNT_CLOCKRESET	5	/* clock reset */
#define	EVNT_BADDATETIM	6	/* invalid time or date */
#define	EVNT_CLOCKEXCPT	7	/* reference clock exception */

/*
 * Peer event codes
 */
#define	EVNT_PEERIPERR	(1 | PEER_EVENT) /* IP error */
#define	EVNT_PEERAUTH	(2 | PEER_EVENT) /* authentication failure */
#define	EVNT_UNREACH	(3 | PEER_EVENT) /* change to unreachable */
#define	EVNT_REACH	(4 | PEER_EVENT) /* change to reachable */
#define	EVNT_PEERCLOCK	(5 | PEER_EVENT) /* clock exception */

/*
 * Clock event codes
 */
#define	CEVNT_NOMINAL	0	/* unspecified */
#define	CEVNT_TIMEOUT	1	/* poll timeout */
#define	CEVNT_BADREPLY	2	/* bad reply format */
#define	CEVNT_FAULT	3	/* hardware or software fault */
#define	CEVNT_PROP	4	/* propagation failure */
#define	CEVNT_BADDATE	5	/* bad date format or value */
#define	CEVNT_BADTIME	6	/* bad time format or value */
#define CEVNT_MAX	CEVNT_BADTIME

/*
 * Very misplaced value.  Default port through which we send traps.
 */
#define	TRAPPORT	18447


/*
 * To speed lookups, peers are hashed by the low order bits of the
 * remote IP address. These definitions relate to that.
 */
#define	NTP_HASH_SIZE	128
#define	NTP_HASH_MASK	(NTP_HASH_SIZE-1)
#define	NTP_HASH_ADDR(src)	sock_hash(src)

/*
 * How we randomize polls.  The poll interval is a power of two. We chose
 * a random interval which is this value plus-minus one second.
 */
#define RANDPOLL(x)	((1 << (x)) - 1 + (ntp_random() & 0x3))

/*
 * min, min3 and max.  Makes it easier to transliterate the spec without
 * thinking about it.
 */
#define	min(a,b)	(((a) < (b)) ? (a) : (b))
#define	max(a,b)	(((a) > (b)) ? (a) : (b))
#define	min3(a,b,c)	min(min((a),(b)), (c))


/*
 * Configuration items.  These are for the protocol module (proto_config())
 */
#define	PROTO_BROADCLIENT	1
#define	PROTO_PRECISION		2	/* (not used) */
#define	PROTO_AUTHENTICATE	3
#define	PROTO_BROADDELAY	4
#define	PROTO_AUTHDELAY		5	/* (not used) */
#define PROTO_MULTICAST_ADD	6
#define PROTO_MULTICAST_DEL	7
#define PROTO_NTP		8
#define PROTO_KERNEL		9
#define PROTO_MONITOR		10
#define PROTO_FILEGEN		11
#define	PROTO_PPS		12
#define PROTO_CAL		13
#define PROTO_MINCLOCK		14
#define	PROTO_MAXCLOCK		15
#define PROTO_MINSANE		16
#define PROTO_FLOOR		17
#define PROTO_CEILING		18
#define PROTO_COHORT		19
#define PROTO_CALLDELAY		20
#define PROTO_MINDISP		21
#define PROTO_MAXDIST		22
#define PROTO_ADJ		23
#define	PROTO_MAXHOP		24
#define	PROTO_BEACON		25
#define	PROTO_ORPHAN		26

/*
 * Configuration items for the loop filter
 */
#define	LOOP_DRIFTINIT		1	/* set initial frequency offset */
#define LOOP_DRIFTCOMP		2	/* set frequency offset */
#define LOOP_MAX		3	/* set step offset */
#define LOOP_PANIC		4	/* set panic offseet */
#define LOOP_PHI		5	/* set dispersion rate */
#define LOOP_MINSTEP		6	/* set step timeout */
#define LOOP_MINPOLL		7	/* set min poll interval (log2 s) */
#define LOOP_ALLAN		8	/* set minimum Allan intercept */
#define LOOP_HUFFPUFF		9	/* set huff-n'-puff filter length */
#define LOOP_FREQ		10	/* set initial frequency */

/*
 * Configuration items for the stats printer
 */
#define	STATS_FREQ_FILE		1	/* configure drift file */
#define STATS_STATSDIR		2	/* directory prefix for stats files */
#define	STATS_PID_FILE		3	/* configure ntpd PID file */

#define MJD_1900		15020	/* MJD for 1 Jan 1900 */

/*
 * Default parameters.  We use these in the absence of something better.
 */
#define	DEFBROADDELAY	4e-3		/* default broadcast offset */
#define INADDR_NTP	0xe0000101	/* NTP multicast address 224.0.1.1 */

/*
 * Structure used optionally for monitoring when this is turned on.
 */
struct mon_data {
	struct mon_data *hash_next;	/* next structure in hash list */
	struct mon_data *mru_next;	/* next structure in MRU list */
	struct mon_data *mru_prev;	/* previous structure in MRU list */
	u_long drop_count;		/* dropped due RESLIMIT*/
	double avg_interval;		/* average interpacket interval */
	u_long lasttime;		/* interval since last packet */
	u_long count;			/* total packet count */
	struct sockaddr_storage rmtadr;	/* address of remote host */
	struct interface *interface;	/* interface on which this arrived */
	u_short rmtport;		/* remote port last came from */
	u_char mode;			/* mode of incoming packet */
	u_char version;			/* version of incoming packet */
	u_char cast_flags;		/* flags MDF_?CAST */
};

/*
 * Values for cast_flags
 */
#define	MDF_UCAST	0x01		/* unicast */
#define	MDF_MCAST	0x02		/* multicast */
#define	MDF_BCAST	0x04		/* broadcast */
#define	MDF_LCAST	0x08		/* localcast */
#define MDF_ACAST	0x10		/* manycast */
#define	MDF_BCLNT	0x20		/* broadcast client */
#define MDF_ACLNT	0x40		/* manycast client */

/*
 * Values used with mon_enabled to indicate reason for enabling monitoring
 */
#define MON_OFF    0x00			/* no monitoring */
#define MON_ON     0x01			/* monitoring explicitly enabled */
#define MON_RES    0x02			/* implicit monitoring for RES_LIMITED */
/*
 * Structure used for restrictlist entries
 */
struct restrictlist {
	struct restrictlist *next;	/* link to next entry */
	u_int32 addr;			/* Ipv4 host address (host byte order) */
	u_int32 mask;			/* Ipv4 mask for address (host byte order) */
	u_long count;			/* number of packets matched */
	u_short flags;			/* accesslist flags */
	u_short mflags;			/* match flags */
};

struct restrictlist6 {
	struct restrictlist6 *next;	/* link to next entry */
	struct in6_addr addr6;		/* Ipv6 host address */
	struct in6_addr mask6;		/* Ipv6 mask address */
	u_long count;			/* number of packets matched */
	u_short flags;			/* accesslist flags */
	u_short mflags;			/* match flags */
};


/*
 * Access flags
 */
#define	RES_IGNORE		0x001	/* ignore packet */
#define	RES_DONTSERVE		0x002	/* access denied */
#define	RES_DONTTRUST		0x004	/* authentication required */
#define	RES_VERSION		0x008	/* version mismatch */
#define	RES_NOPEER		0x010	/* new association denied */
#define RES_LIMITED		0x020	/* packet rate exceeded */

#define RES_FLAGS		(RES_IGNORE | RES_DONTSERVE |\
				    RES_DONTTRUST | RES_VERSION |\
				    RES_NOPEER | RES_LIMITED)

#define	RES_NOQUERY		0x040	/* mode 6/7 packet denied */
#define	RES_NOMODIFY		0x080	/* mode 6/7 modify denied */
#define	RES_NOTRAP		0x100	/* mode 6/7 set trap denied */
#define	RES_LPTRAP		0x200	/* mode 6/7 low priority trap */

#define RES_DEMOBILIZE		0x400	/* send kiss of death packet */
#define RES_TIMEOUT		0x800	/* timeout this entry */

#define	RES_ALLFLAGS		(RES_FLAGS | RES_NOQUERY |\
				    RES_NOMODIFY | RES_NOTRAP |\
				    RES_LPTRAP | RES_DEMOBILIZE |\
				    RES_TIMEOUT)

/*
 * Match flags
 */
#define	RESM_INTERFACE		0x1	/* this is an interface */
#define	RESM_NTPONLY		0x2	/* match ntp port only */

/*
 * Restriction configuration ops
 */
#define	RESTRICT_FLAGS		1	/* add flags to restrict entry */
#define	RESTRICT_UNFLAG		2	/* remove flags from restrict entry */
#define	RESTRICT_REMOVE		3	/* remove a restrict entry */

/*
 * Endpoint structure for the select algorithm
 */
struct endpoint {
	double	val;			/* offset of endpoint */
	int	type;			/* interval entry/exit */
};

/*
 * Association matching AM[] return codes
 */
#define AM_ERR		-1		/* error */
#define AM_NOMATCH	0		/* no match */
#define AM_PROCPKT	1		/* server/symmetric packet */	
#define AM_BCST		2		/* broadcast packet */	
#define AM_FXMIT	3		/* client packet */
#define AM_MANYCAST	4		/* manycast packet */
#define AM_NEWPASS	5		/* new passive */
#define AM_NEWBCL	6		/* new broadcast */
#define	AM_POSSBCL	7		/* discard broadcast */

/* NetInfo configuration locations */
#ifdef HAVE_NETINFO
#define NETINFO_CONFIG_DIR "/config/ntp"
#endif

#endif /* NTP_H */