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and protocol-independent host mode multicast. The code is written to accomodate IPv6, IGMPv3 and MLDv2 with only a little additional work. This change only pertains to FreeBSD's use as a multicast end-station and does not concern multicast routing; for an IGMPv3/MLDv2 router implementation, consider the XORP project. The work is based on Wilbert de Graaf's IGMPv3 code drop for FreeBSD 4.6, which is available at: http://www.kloosterhof.com/wilbert/igmpv3.html Summary * IPv4 multicast socket processing is now moved out of ip_output.c into a new module, in_mcast.c. * The in_mcast.c module implements the IPv4 legacy any-source API in terms of the protocol-independent source-specific API. * Source filters are lazy allocated as the common case does not use them. They are part of per inpcb state and are covered by the inpcb lock. * struct ip_mreqn is now supported to allow applications to specify multicast joins by interface index in the legacy IPv4 any-source API. * In UDP, an incoming multicast datagram only requires that the source port matches the 4-tuple if the socket was already bound by source port. An unbound socket SHOULD be able to receive multicasts sent from an ephemeral source port. * The UDP socket multicast filter mode defaults to exclusive, that is, sources present in the per-socket list will be blocked from delivery. * The RFC 3678 userland functions have been added to libc: setsourcefilter, getsourcefilter, setipv4sourcefilter, getipv4sourcefilter. * Definitions for IGMPv3 are merged but not yet used. * struct sockaddr_storage is now referenced from <netinet/in.h>. It is therefore defined there if not already declared in the same way as for the C99 types. * The RFC 1724 hack (specify 0.0.0.0/8 addresses to IP_MULTICAST_IF which are then interpreted as interface indexes) is now deprecated. * A patch for the Rhyolite.com routed in the FreeBSD base system is available in the -net archives. This only affects individuals running RIPv1 or RIPv2 via point-to-point and/or unnumbered interfaces. * Make IPv6 detach path similar to IPv4's in code flow; functionally same. * Bump __FreeBSD_version to 700048; see UPDATING. This work was financially supported by another FreeBSD committer. Obtained from: p4://bms_netdev Submitted by: Wilbert de Graaf (original work) Reviewed by: rwatson (locking), silence from fenner, net@ (but with encouragement)
130 lines
4.9 KiB
C
130 lines
4.9 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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* 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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* $FreeBSD$
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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 Revision: 3.5.1.2
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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; /* subtype for routing msgs */
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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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struct igmpv3 {
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u_char igmp_type; /* version & type of IGMP message */
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u_char igmp_code; /* subtype for routing msgs */
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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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u_char igmp_misc; /* reserved/suppress/robustness */
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u_char igmp_qqi; /* querier's query interval */
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u_short igmp_numsrc; /* number of sources */
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/*struct in_addr igmp_sources[1];*/ /* source addresses */
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};
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struct igmp_grouprec {
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u_char ig_type; /* record type */
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u_char ig_datalen; /* length of auxiliary data */
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u_short ig_numsrc; /* number of sources */
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struct in_addr ig_group; /* group address being reported */
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/*struct in_addr ig_sources[1];*/ /* source addresses */
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};
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struct igmp_report {
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u_char ir_type; /* record type */
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u_char ir_rsv1; /* reserved */
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u_short ir_cksum; /* checksum */
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u_short ir_rsv2; /* reserved */
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u_short ir_numgrps; /* number of group records */
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struct igmp_grouprec ir_groups[1]; /* group records */
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};
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#define IGMP_MINLEN 8
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#define IGMP_HDRLEN 8
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#define IGMP_GRPREC_HDRLEN 8
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#define IGMP_PREPEND 0
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#define IGMP_QRV(pigmp) ((pigmp)->igmp_misc & (0x07)) /* XXX */
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#define IGMP_MAXSOURCES(len) (((len) - 12) >> 2) /* XXX */
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/*
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* Message types, including version number.
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*/
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#define IGMP_MEMBERSHIP_QUERY 0x11 /* membership query */
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#define IGMP_V1_MEMBERSHIP_REPORT 0x12 /* Ver. 1 membership report */
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#define IGMP_V2_MEMBERSHIP_REPORT 0x16 /* Ver. 2 membership report */
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#define IGMP_V2_LEAVE_GROUP 0x17 /* Leave-group message */
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#define IGMP_DVMRP 0x13 /* DVMRP routing message */
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#define IGMP_PIM 0x14 /* PIM routing message */
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#define IGMP_MTRACE_RESP 0x1e /* traceroute resp.(to sender)*/
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#define IGMP_MTRACE 0x1f /* mcast traceroute messages */
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#define IGMP_V3_MEMBERSHIP_REPORT 0x22 /* Ver. 3 membership report */
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#define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */
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/* query (in seconds) according */
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/* to RFC1112 */
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#define IGMP_TIMER_SCALE 10 /* denotes that the igmp code field */
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/* specifies time in 10th of seconds*/
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/*
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* The following four defininitions are for backwards compatibility.
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* They should be removed as soon as all applications are updated to
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* use the new constant names.
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*/
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#define IGMP_HOST_MEMBERSHIP_QUERY IGMP_MEMBERSHIP_QUERY
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#define IGMP_HOST_MEMBERSHIP_REPORT IGMP_V1_MEMBERSHIP_REPORT
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#define IGMP_HOST_NEW_MEMBERSHIP_REPORT IGMP_V2_MEMBERSHIP_REPORT
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#define IGMP_HOST_LEAVE_MESSAGE IGMP_V2_LEAVE_GROUP
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#endif /* _NETINET_IGMP_H_ */
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