libipvs.h

实现了集群的实现 完成了资源负载平衡等问题

/*
 * libipvs.h:	header file for the library ipvs
 *
 * Version:	$Id: libipvs.h,v 1.7 2003/06/08 09:31:39 wensong Exp $
 *
 * Authors:	Wensong Zhang <[e-mail]>
 *
 */

#ifndef _LIBIPVS_H
#define _LIBIPVS_H

#ifdef HAVE_NET_IP_VS_H
#include <net/ip_vs.h>
#else
#include "ip_vs.h"
#endif


#define MINIMUM_IPVS_VERSION_MAJOR      1
#define MINIMUM_IPVS_VERSION_MINOR      1
#define MINIMUM_IPVS_VERSION_PATCH      4

#ifndef IPVS_VERSION
#define IPVS_VERSION(x,y,z)		(((x)<<16)+((y)<<8)+(z))
#endif

/*
 * The default IPVS_SVC_PERSISTENT_TIMEOUT is a little larger than average
 * connection time plus IPVS TCP FIN timeout (2*60 seconds). Because the
 * connection template won't be released until its controlled connection
 * entries are expired.
 * If IPVS_SVC_PERSISTENT_TIMEOUT is too less, the template will expire
 * soon and will be put in expire again and again, which causes additional
 * overhead. If it is too large, the same will always visit the same
 * server, which may make dynamic load imbalance worse.
 */
#define IPVS_SVC_PERSISTENT_TIMEOUT	(6*60)


typedef struct ip_vs_service_user	ipvs_service_t;
typedef struct ip_vs_dest_user		ipvs_dest_t;
typedef struct ip_vs_timeout_user	ipvs_timeout_t;
typedef struct ip_vs_daemon_user	ipvs_daemon_t;
typedef struct ip_vs_service_entry	ipvs_service_entry_t;
typedef struct ip_vs_dest_entry		ipvs_dest_entry_t;


/* ipvs info variable */
extern struct ip_vs_getinfo ipvs_info;

/* init socket and get ipvs info */
extern int ipvs_init(void);

/* get ipvs info separately */
extern int ipvs_getinfo(void);

/* get the version number */
extern unsigned int ipvs_version(void);

/* flush all the rules */
extern int ipvs_flush(void);

/* add a virtual service */
extern int ipvs_add_service(ipvs_service_t *svc);

/* update a virtual service with new options */
extern int ipvs_update_service(ipvs_service_t *svc);

/* delete a virtual service */
extern int ipvs_del_service(ipvs_service_t *svc);

/* zero the counters of a service or all */
extern int ipvs_zero_service(ipvs_service_t *svc);

/* add a destination server into a service */
extern int ipvs_add_dest(ipvs_service_t *svc, ipvs_dest_t *dest);

/* update a destination server with new options */
extern int ipvs_update_dest(ipvs_service_t *svc, ipvs_dest_t *dest);

/* remove a destination server from a service */
extern int ipvs_del_dest(ipvs_service_t *svc, ipvs_dest_t *dest);

/* set timeout */
extern int ipvs_set_timeout(ipvs_timeout_t *to);

/* start a connection synchronizaiton daemon (master/backup) */
extern int ipvs_start_daemon(ipvs_daemon_t *dm);

/* stop a connection synchronizaiton daemon (master/backup) */
extern int ipvs_stop_daemon(ipvs_daemon_t *dm);


/* get all the ipvs services */
extern struct ip_vs_get_services *ipvs_get_services(void);

/* sort the service entries */
typedef int (*ipvs_service_cmp_t)(ipvs_service_entry_t *,
				  ipvs_service_entry_t *);
extern int ipvs_cmp_services(ipvs_service_entry_t *s1,
			     ipvs_service_entry_t *s2);
extern void ipvs_sort_services(struct ip_vs_get_services *s,
			       ipvs_service_cmp_t f);

/* get the destination array of the specified service */
extern struct ip_vs_get_dests *ipvs_get_dests(ipvs_service_entry_t *svc);

/* sort the destination entries */
typedef int (*ipvs_dest_cmp_t)(ipvs_dest_entry_t *,
			       ipvs_dest_entry_t *);
extern int ipvs_cmp_dests(ipvs_dest_entry_t *d1,
			  ipvs_dest_entry_t *d2);
extern void ipvs_sort_dests(struct ip_vs_get_dests *d,
			    ipvs_dest_cmp_t f);

/* get an ipvs service entry */
extern ipvs_service_entry_t *
ipvs_get_service(__u32 fwmark, __u16 protocol, __u32 addr, __u16 port);

/* get ipvs timeout */
extern ipvs_timeout_t *ipvs_get_timeout(void);

/* get ipvs daemon information */
extern ipvs_daemon_t *ipvs_get_daemon(void);

/* close the socket */
extern void ipvs_close(void);

extern const char *ipvs_strerror(int err);

#endif /* _LIBIPVS_H */