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to something more recent than the ancient 1.2 release contained in 4.4. This code has the following advantages as compared to previous versions (culled from the README file for the SunOS release): - True multicast delivery - Configurable rate-limiting of forwarded multicast traffic on each physical interface or tunnel, using a token-bucket limiter. - Simplistic classification of packets for prioritized dropping. - Administrative scoping of multicast address ranges. - Faster detection of hosts leaving groups. - Support for multicast traceroute (code not yet available). - Support for RSVP, the Resource Reservation Protocol. What still needs to be done: - The multicast forwarder needs testing. - The multicast routing daemon needs to be ported. - Network interface drivers need to have the `#ifdef MULTICAST' goop ripped out of them. - The IGMP code should probably be bogon-tested. Some notes about the porting process: In some cases, the Berkeley people decided to incorporate functionality from later releases of the multicast code, but then had to do things differently. As a result, if you look at Deering's patches, and then look at our code, it is not always obvious whether the patch even applies. Let the reader beware. I ran ip_mroute.c through several passes of `unifdef' to get rid of useless grot, and to permanently enable the RSVP support, which we will include as standard. Ported by: Garrett Wollman Submitted by: Steve Deering and Ajit Thyagarajan (among others)
94 lines
3.8 KiB
C
94 lines
3.8 KiB
C
/*
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* Copyright (c) 1988 Stephen Deering.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Stephen Deering of Stanford University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)igmp.h 8.1 (Berkeley) 6/10/93
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* $Id: igmp.h,v 1.3 1994/08/21 05:27:25 paul Exp $
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*/
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#ifndef _NETINET_IGMP_H_
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#define _NETINET_IGMP_H_
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/*
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* Internet Group Management Protocol (IGMP) definitions.
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*
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* Written by Steve Deering, Stanford, May 1988.
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*
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* MULTICAST 1.2
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*/
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/*
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* IGMP packet format.
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*/
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struct igmp {
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u_char igmp_type; /* version & type of IGMP message */
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u_char igmp_code; /* unused, should be zero */
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u_short igmp_cksum; /* IP-style checksum */
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struct in_addr igmp_group; /* group address being reported */
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}; /* (zero for queries) */
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#define IGMP_MINLEN 8
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#define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* message types, incl. version */
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#define IGMP_HOST_MEMBERSHIP_REPORT 0x12
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#define IGMP_DVMRP 0x13 /* for experimental multicast */
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/* routing protocol */
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#define IGMP_HOST_NEW_MEMBERSHIP_REPORT 0x16
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#define IGMP_HOST_LEAVE_MESSAGE 0x17
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#define IGMP_MTRACE 0x1f /* mcast traceroute messages */
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#define IGMP_MTRACE_RESP 0x1e /* traceroute resp. (to sender) */
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#define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */
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#define IGMP_TIMER_SCALE 10 /* denotes that the igmp->timer filed */
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/*specifies time in 10th os seconds */
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#define IGMP_DELAYING_MEMBER 1
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#define IGMP_IDLE_MEMBER 2
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#define IGMP_LAZY_MEMBER 3
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#define IGMP_SLEEPING_MEMBER 4
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#define IGMP_AWAKENING_MEMBER 5
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#define IGMP_OLD_ROUTER 0
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#define IGMP_NEW_ROUTER 1
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#define IGMP_AGE_THRESHOLD 540
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#ifdef IGMP_STATES
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static char *tostate[]={"","DELAYING_MEMBER","IDLE","LAZY","SLEEPING",
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"AWAKENING" };
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#endif /* IGMP_STATES */
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#endif /* _NETINET_IGMP_H_ */
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