/*
 * Soft:        Keepalived is a failover program for the LVS project
 *              <www.linuxvirtualserver.org>. It monitor & manipulate
 *              a loadbalanced server pool using multi-layer checks.
 *
 * Part:        vrrp_ipaddress.c include file.
 *
 * Author:      Alexandre Cassen, <acassen@linux-vs.org>
 *
 *              This program is distributed in the hope that it will be useful,
 *              but WITHOUT ANY WARRANTY; without even the implied warranty of
 *              MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *              See the GNU General Public License for more details.
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 * Copyright (C) 2001-2017 Alexandre Cassen, <acassen@gmail.com>
 */

#ifndef _VRRP_IPADDR_H
#define _VRRP_IPADDR_H

#include "config.h"

/* global includes */
#include <netinet/in.h>
#include <linux/if_addr.h>
#include <stdbool.h>
#include <stdio.h>

/* local includes */
#include "vrrp.h"
#include "vrrp_if.h"
#include "list_head.h"
#include "vector.h"
#include "vrrp_static_track.h"

/* types definition */
typedef struct _ip_address {
	struct ifaddrmsg ifa;

	union {
		struct {
			struct in_addr sin_addr;
			struct in_addr sin_brd;
		} sin;
		struct in6_addr sin6_addr;
	} u;

	interface_t		*ifp;			/* Interface owning IP address */
	char			*label;			/* Alias name, e.g. eth0:1 */
#if HAVE_DECL_IFA_FLAGS
	uint32_t		flags;			/* Address flags */
	uint32_t		flagmask;		/* Bitmaps of flags set */
#else
	uint8_t			flags;			/* Address flags */
	uint8_t			flagmask;		/* Bitmaps of flags set */
#endif
	bool			have_peer;
	union {
		struct in_addr sin_addr;
		struct in6_addr sin6_addr;
	} peer;
	bool			dont_track;		/* Don't leave master state if address is deleted */
	static_track_group_t	*track_group;		/* used for static addresses */

	bool			set;			/* TRUE if addr is set */
#ifdef _WITH_IPTABLES_
	bool			iptable_rule_set;	/* TRUE if iptable drop rule
							 * set to addr */
#endif
#ifdef _WITH_NFTABLES_
	bool			nftable_rule_set;	/* TRUE if in nftables set */
#endif
	bool			garp_gna_pending;	/* Is a gratuitous ARP/NA message still to be sent */
	uint32_t		preferred_lft;		/* IPv6 preferred_lft (0 means address deprecated) */

	/* linked list member */
	list_head_t		e_list;
} ip_address_t;

#define IPADDRESS_DEL 0
#define IPADDRESS_ADD 1
#define DFLT_INT	"eth0"

/* Macro definition */
#define IP_FAMILY(X)	(X)->ifa.ifa_family
#define IP_IS6(X)	((X)->ifa.ifa_family == AF_INET6)
#define IP_IS4(X)	((X)->ifa.ifa_family == AF_INET)

#define IPcommon_ISEQ(X,Y) \
			((X)->ifa.ifa_prefixlen     == (Y)->ifa.ifa_prefixlen		&& \
			 !(X)->ifp                  == !(Y)->ifp                        && \
			 (!(X)->ifp                                                     || \
			  (X)->ifp->ifindex	    == (Y)->ifp->ifindex)		&& \
			 (X)->ifa.ifa_scope	    == (Y)->ifa.ifa_scope		&& \
			 string_equal((X)->label, (Y)->label))

#define IP4_ISEQ(X,Y)   ((X)->u.sin.sin_addr.s_addr == (Y)->u.sin.sin_addr.s_addr	&& \
			 IPcommon_ISEQ((X),(Y)))

#define IP6_ISEQ(X,Y)   ((X)->u.sin6_addr.s6_addr32[0] == (Y)->u.sin6_addr.s6_addr32[0]	&& \
			 (X)->u.sin6_addr.s6_addr32[1] == (Y)->u.sin6_addr.s6_addr32[1]	&& \
			 (X)->u.sin6_addr.s6_addr32[2] == (Y)->u.sin6_addr.s6_addr32[2]	&& \
			 (X)->u.sin6_addr.s6_addr32[3] == (Y)->u.sin6_addr.s6_addr32[3]	&& \
			 IPcommon_ISEQ((X),(Y)))

#define IP_ISEQ(X,Y)    (!(X) && !(Y) ? true : !(X) != !(Y) ? false : (IP_FAMILY(X) != IP_FAMILY(Y) ? false : IP_IS6(X) ? IP6_ISEQ(X, Y) : IP4_ISEQ(X, Y)))

#define	IPADDRESSTOS_BUF_LEN	(INET6_ADDRSTRLEN + 4)     /* allow for subnet */

/* Forward reference */
struct ipt_handle;

/* prototypes */
extern const char *ipaddresstos(char *, const ip_address_t *);
extern int netlink_ipaddress(ip_address_t *, int);
extern bool netlink_iplist(list_head_t *, int, bool);
extern void free_ipaddress(ip_address_t *);
extern void free_ipaddress_list(list_head_t *);
extern void format_ipaddress(const ip_address_t *, char *, size_t);
extern void dump_ipaddress(FILE *, const ip_address_t *);
extern void dump_ipaddress_list(FILE *, const list_head_t *);
extern ip_address_t *parse_ipaddress(ip_address_t *, const char *, bool);
extern ip_address_t *parse_route(const char *);
extern void alloc_ipaddress(list_head_t *, const vector_t *, bool);
extern void get_diff_address(vrrp_t *, vrrp_t *, list_head_t *);
extern void clear_address_list(list_head_t *, bool);
extern void clear_diff_static_addresses(void);
extern void reinstate_static_address(ip_address_t *);

#endif