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Welcome dvmrpd
started by Esben Norby some time ago by using the imsg/three process framework
of ospfd.
Right now it is not particularly useful, major parts are still missing but is
imported to allow more people to work on it.

Status:

The IGMP part is mostly complete, allowing clients to join and leave groups.
Election the IGMP querier of a network is also functional, only thing missing is
some corner cases when going from non-querier to querier.

About half of the DVMRP is functional, probes and route reports are functional.

Multicast streams can be detected and the MFC can be manipulated.
The RIB is not complete but operational.

Not yet connected to the builds.

OK claudio@

/*	$OpenBSD: dvmrp.h,v 1.1 2006/06/01 14:12:20 norby 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.
 */

/* DVMRP protocol definitions */

#ifndef _DVMRP_H_
#define _DVMRP_H_

/* misc */
#define IPPROTO_DVMRP			2
#define AllDVMRPRouters			"224.0.0.4"

#define DEFAULT_PROBE_INTERVAL		10
#define NBR_TMOUT			35
#define MIN_FLASH_UPDATE_INTERVAL	5
#define ROUTE_REPORT_INTERVAL		60
#define ROUTE_EXPIRATION_TIME		140
#define ROUTE_HOLD_DOWN			2 * ROUTE_REPORT_INTERVAL
#define MAX_PRUNE_LIFETIME		2 * 3600	/* 2 hours */
#define PRUNE_RETRANS_TIME		3		/* with exp. back off */
#define GRAFT_RETRANS_TIME		5		/* with exp. back off */

#define DEFAULT_NBR_TMOUT		86400	/* 24 hours */
						/* remove neighbor completely */

#define DEFAULT_CACHE_LIFETIME		300

#define DEFAULT_METRIC			1
#define MIN_METRIC			1
#define MAX_METRIC			31
#define INFINITY_METRIC			31

#define LAST_MASK			0x80		/* route reports */
#define METRIC_MASK			~LAST_MASK	/* route reports */

#define DVMRP_MAJOR_VERSION		3
#define DVMRP_MINOR_VERSION		255

/* DVMRP packet types */
#define PKT_TYPE_DVMRP			0x13

#define DVMRP_CODE_PROBE		0x01
#define DVMRP_CODE_REPORT		0x02
#define DVMRP_CODE_ASK_NBRS		0x03	/* obsolete */
#define DVMRP_CODE_NBRS			0x04	/* obsolete */
#define DVMRP_CODE_ASK_NBRS2		0x05
#define DVMRP_CODE_NBRS2		0x06
#define DVMRP_CODE_PRUNE		0x07
#define DVMRP_CODE_GRAFT		0x08
#define DVMRP_CODE_GRAFT_ACK		0x09

/* DVMRP command types */
#define DVMRP_CMD_NULL			0
#define DVMRP_CMD_AF_INDICATOR		2
#define DVMRP_CMD_SUBNETMASK		3
#define DVMRP_CMD_METRIC		4
#define DVMRP_CMD_FLAGS0		5
#define DVMRP_CMD_INFINITY		6
#define DVMRP_CMD_DEST_ADDR		7
#define DVMRP_CMD_REQ_DEST_ADDR		8
#define DVMRP_CMD_NON_MEM_REPORT	9
#define DVMRP_CMD_NON_MEM_CANCEL	10

/* DVMRP capabilities */
#define DVMRP_CAP_LEAF			0x01
#define DVMRP_CAP_PRUNE			0x02
#define DVMRP_CAP_GENID			0x04
#define DVMRP_CAP_MTRACE		0x08
#define DVMRP_CAP_SNMP			0x10
#define DVMRP_CAP_NETMASK		0x20
#define DVMRP_CAP_DEFAULT		(DVMRP_CAP_PRUNE | DVMRP_CAP_GENID | \
					    DVMRP_CAP_MTRACE)

/* DVMRP header */
struct dvmrp_hdr {
	u_int8_t		type;
	u_int8_t		code;
	u_int16_t		chksum;
	u_int8_t		dummy;
	u_int8_t		capabilities;
	u_int8_t		minor_version;
	u_int8_t		major_version;
};

/* Prune header */
struct prune_hdr {
	u_int32_t		src_host_addr;
	u_int32_t		group_addr;
	u_int32_t		lifetime;
	u_int32_t		src_netmask;
};

/* Graft and Graft Ack header */
struct graft_hdr {
	u_int32_t		src_host_addr;
	u_int32_t		group_addr;
	u_int32_t		src_netmask;
};

struct igmpmsg {
	u_int32_t unused1;
	u_int32_t unused2;
	u_int8_t  im_msgtype;		/* what type of message */
#define	IGMPMSG_NOCACHE		1	/* no MFC in the kernel		    */
#define	IGMPMSG_WRONGVIF	2	/* packet came from wrong interface */
#define	IGMPMSG_WHOLEPKT	3	/* PIM pkt for user level encap.    */
#define	IGMPMSG_BW_UPCALL	4	/* BW monitoring upcall		    */
	u_int8_t  im_mbz;		/* must be zero */
	u_int8_t  im_vif;		/* vif rec'd on */
	u_int8_t  unused3;
	struct	  in_addr im_src, im_dst;
};

#endif /* !_DVMRP_H_ */