/*	$OpenBSD: igmp.h,v 1.2 2009/03/06 18:39:13 michele Exp $ */

/*
 * Copyright (c) 2005, 2006 Esben Norby <norby@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* IGMP protocol definitions */

#ifndef _IGMP_H_
#define _IGMP_H_

/* misc */
#define AllSystems				"224.0.0.1"
#define AllRouters				"224.0.0.2"
#define AllIGMPv3Routers			"224.0.0.22"

#define DEFAULT_ROBUSTNESS			2
#define MIN_ROBUSTNESS				1
#define MAX_ROBUSTNESS				4

#define DEFAULT_QUERY_INTERVAL			125
#define MIN_QUERY_INTERVAL			1
#define MAX_QUERY_INTERVAL			65535

/* must be less than QUERY_INTERVAL */
#define DEFAULT_QUERY_RESP_INTERVAL		100		/* 10 seconds */
#define MIN_QUERY_RESP_INTERVAL			1
#define MAX_QUERY_RESP_INTERVAL			65535

#define DEFAULT_STARTUP_QUERY_INTERVAL		DEFAULT_QUERY_INTERVAL / 4
#define MIN_STARTUP_QUERY_INTERVAL		MIN_QUERY_INTERVAL
#define MAX_STARTUP_QUERY_INTERVAL		MAX_QUERY_INTERVAL

#define DEFAULT_STARTUP_QUERY_CNT		DEFAULT_ROBUSTNESS
#define MIN_STARTUP_QUERY_CNT			MIN_ROBUSTNESS	/* XXX */
#define MAX_STARTUP_QUERY_CNT			MAX_ROBUSTNESS	/* XXX */

#define DEFAULT_LAST_MEMBER_QUERY_INTERVAL	10		/* 1 second */
#define MIN_LAST_MEMBER_QUERY_INTERVAL		1
#define MAX_LAST_MEMBER_QUERY_INTERVAL		65535

#define DEFAULT_LAST_MEMBER_QUERY_CNT		DEFAULT_ROBUSTNESS
#define MIN_LAST_MEMBER_QUERY_CNT		1
#define MAX_LAST_MEMBER_QUERY_CNT		255

/* IGMP packet types */
#define PKT_TYPE_MEMBER_QUERY			0x11
#define PKT_TYPE_MEMBER_REPORTv1		0x12
#define PKT_TYPE_MEMBER_REPORTv2		0x16
#define PKT_TYPE_LEAVE_GROUPv2			0x17
#define PKT_TYPE_MEMBER_REPORTv3		0x22

#define DEFAULT_IGMP_VERSION			2
#define MIN_IGMP_VERSION			1
#define MAX_IGMP_VERSION			2

/* IGMP header */
struct igmp_hdr {
	u_int8_t		type;
	u_int8_t		max_resp_time;
	u_int16_t		chksum;
	u_int32_t		grp_addr;
};

/* group states */
#define	GRP_STA_NO_MEMB_PRSNT	0x01
#define	GRP_STA_MEMB_PRSNT	0x02
#define GRP_STA_V1_MEMB_PRSNT	0x04
#define	GRP_STA_CHECK_MEMB	0x08
#define	GRP_STA_ANY		0x0e

/* group events */
enum group_event {
	GRP_EVT_V2_REPORT_RCVD,
	GRP_EVT_V1_REPORT_RCVD,
	GRP_EVT_LEAVE_RCVD,
	GRP_EVT_TMR_EXPIRED,
	GRP_EVT_RETRANS_TMR_EXP,
	GRP_EVT_V1_HOST_TMR_EXP,
	GRP_EVT_REPORT_RCVD,
	GRP_EVT_QUERY_RCVD,
	GRP_EVT_NOTHING
};

/* group actions */
enum group_action {
	GRP_ACT_END,
	GRP_ACT_START_TMR,
	GRP_ACT_START_TMR_ALL,
	GRP_ACT_START_RETRANS_TMR,
	GRP_ACT_START_V1_HOST_TMR,
	GRP_ACT_SEND_GRP_QUERY,
	GRP_ACT_ADD_GROUP,
	GRP_ACT_DEL_GROUP,
	GRP_ACT_CLR_RETRANS_TMR,
	GRP_ACT_NOTHING
};

#endif /* _IGMP_H_ */