632 lines
16 KiB
C
632 lines
16 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.c 8.1 (Berkeley) 7/19/93
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* $Id: igmp.c,v 1.5 1994/09/14 03:10:07 wollman Exp $
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*/
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/*
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* Internet Group Management Protocol (IGMP) routines.
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*
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* Written by Steve Deering, Stanford, May 1988.
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* Modified by Rosen Sharma, Stanford, Aug 1994.
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*
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* MULTICAST 1.4
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/protosw.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/igmp.h>
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#include <netinet/igmp_var.h>
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extern struct ifnet loif;
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struct igmpstat igmpstat;
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static int igmp_timers_are_running = 0;
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static u_long igmp_all_hosts_group;
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static struct router_info *Head = 0;
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static void igmp_sendpkt(struct in_multi *, int);
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static void igmp_sendleave(struct in_multi *);
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void
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igmp_init()
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{
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/*
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* To avoid byte-swapping the same value over and over again.
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*/
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igmp_all_hosts_group = htonl(INADDR_ALLHOSTS_GROUP);
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Head = (struct router_info *) 0;
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}
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int
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fill_rti(inm)
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struct in_multi *inm;
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{
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register struct router_info *rti = Head;
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#ifdef IGMP_DEBUG
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printf("[igmp.c, _fill_rti] --> entering \n");
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#endif
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while (rti) {
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if (rti->ifp == inm->inm_ifp){ /* ? is it ok to compare */
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/* pointers */
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inm->inm_rti = rti;
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#ifdef IGMP_DEBUG
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printf("[igmp.c, _fill_rti] --> found old entry \n");
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#endif
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if (rti->type == IGMP_OLD_ROUTER)
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return IGMP_HOST_MEMBERSHIP_REPORT;
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else
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return IGMP_HOST_NEW_MEMBERSHIP_REPORT;
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}
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rti = rti->next;
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}
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MALLOC(rti, struct router_info *, sizeof *rti, M_MRTABLE, M_NOWAIT);
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rti->ifp = inm->inm_ifp;
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rti->type = IGMP_NEW_ROUTER;
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rti->time = IGMP_AGE_THRESHOLD;
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rti->next = Head;
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Head = rti;
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inm->inm_rti = rti;
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#ifdef IGMP_DEBUG
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printf("[igmp.c, _fill_rti] --> created new entry \n");
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#endif
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return IGMP_HOST_NEW_MEMBERSHIP_REPORT;
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}
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struct router_info *
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find_rti(ifp)
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struct ifnet *ifp;
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{
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register struct router_info *rti = Head;
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#ifdef IGMP_DEBUG
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printf("[igmp.c, _find_rti] --> entering \n");
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#endif
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while (rti) {
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if (rti->ifp == ifp){ /* ? is it ok to compare pointers */
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#ifdef IGMP_DEBUG
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printf("[igmp.c, _find_rti] --> found old entry \n");
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#endif
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return rti;
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}
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rti = rti->next;
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}
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MALLOC(rti, struct router_info *, sizeof *rti, M_MRTABLE, M_NOWAIT);
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rti->ifp = ifp;
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rti->type = IGMP_NEW_ROUTER;
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rti->time = IGMP_AGE_THRESHOLD;
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rti->next = Head;
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Head = rti;
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#ifdef IGMP_DEBUG
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printf("[igmp.c, _find_rti] --> created an entry \n");
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#endif
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return rti;
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}
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void
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igmp_input(m, iphlen)
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register struct mbuf *m;
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register int iphlen;
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{
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register struct igmp *igmp;
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register struct ip *ip;
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register int igmplen;
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register struct ifnet *ifp = m->m_pkthdr.rcvif;
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register int minlen;
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register struct in_multi *inm;
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register struct in_ifaddr *ia;
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struct in_multistep step;
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struct router_info *rti;
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static int timer; /** timer value in the igmp query header **/
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++igmpstat.igps_rcv_total;
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ip = mtod(m, struct ip *);
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igmplen = ip->ip_len;
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/*
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* Validate lengths
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*/
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if (igmplen < IGMP_MINLEN) {
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++igmpstat.igps_rcv_tooshort;
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m_freem(m);
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return;
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}
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minlen = iphlen + IGMP_MINLEN;
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if ((m->m_flags & M_EXT || m->m_len < minlen) &&
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(m = m_pullup(m, minlen)) == 0) {
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++igmpstat.igps_rcv_tooshort;
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return;
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}
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/*
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* Validate checksum
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*/
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m->m_data += iphlen;
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m->m_len -= iphlen;
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igmp = mtod(m, struct igmp *);
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if (in_cksum(m, igmplen)) {
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++igmpstat.igps_rcv_badsum;
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m_freem(m);
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return;
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}
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m->m_data -= iphlen;
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m->m_len += iphlen;
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ip = mtod(m, struct ip *);
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timer = ntohs(igmp->igmp_code);
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rti = find_rti(ifp);
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switch (igmp->igmp_type) {
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case IGMP_HOST_MEMBERSHIP_QUERY:
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++igmpstat.igps_rcv_queries;
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if (ifp == &loif)
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break;
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if (igmp->igmp_code == 0) {
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rti->type = IGMP_OLD_ROUTER; rti->time = 0;
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/*
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** Do exactly as RFC 1112 says
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*/
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if (ip->ip_dst.s_addr != igmp_all_hosts_group) {
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++igmpstat.igps_rcv_badqueries;
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m_freem(m);
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return;
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}
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/*
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* Start the timers in all of our membership records for
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* the interface on which the query arrived, except those
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* that are already running and those that belong to the
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* "all-hosts" group.
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*/
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IN_FIRST_MULTI(step, inm);
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while (inm != NULL) {
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if (inm->inm_ifp == ifp
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&& inm->inm_timer == 0
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&& inm->inm_addr.s_addr
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!= igmp_all_hosts_group) {
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inm->inm_state = IGMP_DELAYING_MEMBER;
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inm->inm_timer = IGMP_RANDOM_DELAY(
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IGMP_MAX_HOST_REPORT_DELAY * PR_FASTHZ );
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igmp_timers_are_running = 1;
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}
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IN_NEXT_MULTI(step, inm);
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}
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} else {
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/*
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** New Router
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*/
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if (ip->ip_dst.s_addr != igmp_all_hosts_group) {
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if (!(m->m_flags & M_MCAST)) {
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++igmpstat.igps_rcv_badqueries;
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m_freem(m);
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return;
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}
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}
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if (ip->ip_dst.s_addr == igmp_all_hosts_group) {
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/*
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* - Start the timers in all of our membership records
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* for the interface on which the query arrived
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* excl. those that belong to the "all-hosts" group.
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* - For timers already running check if they need to
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* be reset.
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* - Use the igmp->igmp_code filed as the maximum
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* delay possible
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*/
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IN_FIRST_MULTI(step, inm);
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while (inm != NULL){
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switch(inm->inm_state){
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case IGMP_IDLE_MEMBER:
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case IGMP_LAZY_MEMBER:
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case IGMP_AWAKENING_MEMBER:
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if (inm->inm_ifp == ifp &&
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inm->inm_addr.s_addr !=
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igmp_all_hosts_group) {
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inm->inm_timer = IGMP_RANDOM_DELAY(timer);
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igmp_timers_are_running = 1;
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inm->inm_state = IGMP_DELAYING_MEMBER;
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}
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break;
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case IGMP_DELAYING_MEMBER:
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if (inm->inm_ifp == ifp &&
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(inm->inm_timer >
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timer * PR_FASTHZ / IGMP_TIMER_SCALE)
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&&
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inm->inm_addr.s_addr !=
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igmp_all_hosts_group) {
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inm->inm_timer = IGMP_RANDOM_DELAY(timer);
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igmp_timers_are_running = 1;
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inm->inm_state = IGMP_DELAYING_MEMBER;
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}
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break;
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case IGMP_SLEEPING_MEMBER:
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inm->inm_state = IGMP_AWAKENING_MEMBER;
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break;
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}
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IN_NEXT_MULTI(step, inm);
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}
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} else {
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/*
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** group specific query
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*/
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IN_FIRST_MULTI(step, inm);
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while (inm != NULL) {
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if (inm->inm_addr.s_addr == ip->ip_dst.s_addr) {
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switch(inm->inm_state ){
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case IGMP_IDLE_MEMBER:
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case IGMP_LAZY_MEMBER:
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case IGMP_AWAKENING_MEMBER:
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inm->inm_state = IGMP_DELAYING_MEMBER;
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if (inm->inm_ifp == ifp ) {
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inm->inm_timer = IGMP_RANDOM_DELAY(timer);
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igmp_timers_are_running = 1;
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inm->inm_state = IGMP_DELAYING_MEMBER;
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}
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break;
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case IGMP_DELAYING_MEMBER:
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inm->inm_state = IGMP_DELAYING_MEMBER;
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if (inm->inm_ifp == ifp &&
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(inm->inm_timer >
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timer * PR_FASTHZ / IGMP_TIMER_SCALE) ) {
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inm->inm_timer = IGMP_RANDOM_DELAY(timer);
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igmp_timers_are_running = 1;
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inm->inm_state = IGMP_DELAYING_MEMBER;
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}
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break;
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case IGMP_SLEEPING_MEMBER:
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inm->inm_state = IGMP_AWAKENING_MEMBER;
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break;
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}
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}
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IN_NEXT_MULTI(step, inm);
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}
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}
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}
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break;
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case IGMP_HOST_MEMBERSHIP_REPORT:
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++igmpstat.igps_rcv_reports;
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if (ifp == &loif)
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break;
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if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) ||
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igmp->igmp_group.s_addr != ip->ip_dst.s_addr) {
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++igmpstat.igps_rcv_badreports;
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m_freem(m);
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return;
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}
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/*
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* KLUDGE: if the IP source address of the report has an
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* unspecified (i.e., zero) subnet number, as is allowed for
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* a booting host, replace it with the correct subnet number
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* so that a process-level multicast routing demon can
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* determine which subnet it arrived from. This is necessary
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* to compensate for the lack of any way for a process to
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* determine the arrival interface of an incoming packet.
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*/
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if ((ntohl(ip->ip_src.s_addr) & IN_CLASSA_NET) == 0) {
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IFP_TO_IA(ifp, ia);
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if (ia) ip->ip_src.s_addr = htonl(ia->ia_subnet);
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}
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/*
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* If we belong to the group being reported, stop
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* our timer for that group.
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*/
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IN_LOOKUP_MULTI(igmp->igmp_group, ifp, inm);
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if (inm != NULL) {
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inm->inm_timer = 0;
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++igmpstat.igps_rcv_ourreports;
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}
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if (inm != NULL) {
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inm->inm_timer = 0;
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++igmpstat.igps_rcv_ourreports;
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switch(inm->inm_state){
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case IGMP_IDLE_MEMBER:
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case IGMP_LAZY_MEMBER:
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case IGMP_AWAKENING_MEMBER:
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case IGMP_SLEEPING_MEMBER:
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inm->inm_state = IGMP_SLEEPING_MEMBER;
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break;
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case IGMP_DELAYING_MEMBER:
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/** check this out - this was if (oldrouter) **/
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if (inm->inm_rti->type == IGMP_OLD_ROUTER)
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inm->inm_state = IGMP_LAZY_MEMBER;
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else inm->inm_state = IGMP_SLEEPING_MEMBER;
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break;
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}
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}
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break;
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case IGMP_HOST_NEW_MEMBERSHIP_REPORT:
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/*
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* an new report
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*/
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++igmpstat.igps_rcv_reports;
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if (ifp == &loif)
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break;
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if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr)) ||
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igmp->igmp_group.s_addr != ip->ip_dst.s_addr) {
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++igmpstat.igps_rcv_badreports;
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m_freem(m);
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return;
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}
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/*
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* KLUDGE: if the IP source address of the report has an
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* unspecified (i.e., zero) subnet number, as is allowed for
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* a booting host, replace it with the correct subnet number
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* so that a process-level multicast routing demon can
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* determine which subnet it arrived from. This is necessary
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* to compensate for the lack of any way for a process to
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* determine the arrival interface of an incoming packet.
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*/
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if ((ntohl(ip->ip_src.s_addr) & IN_CLASSA_NET) == 0) {
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IFP_TO_IA(ifp, ia);
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if (ia) ip->ip_src.s_addr = htonl(ia->ia_subnet);
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}
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/*
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* If we belong to the group being reported, stop
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* our timer for that group.
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*/
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IN_LOOKUP_MULTI(igmp->igmp_group, ifp, inm);
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if (inm != NULL) {
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inm->inm_timer = 0;
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++igmpstat.igps_rcv_ourreports;
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switch(inm->inm_state){
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case IGMP_DELAYING_MEMBER:
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case IGMP_IDLE_MEMBER:
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inm->inm_state = IGMP_LAZY_MEMBER;
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break;
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case IGMP_AWAKENING_MEMBER:
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inm->inm_state = IGMP_LAZY_MEMBER;
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break;
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case IGMP_LAZY_MEMBER:
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case IGMP_SLEEPING_MEMBER:
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break;
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}
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}
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}
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/*
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* Pass all valid IGMP packets up to any process(es) listening
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* on a raw IGMP socket.
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*/
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rip_input(m);
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}
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void
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igmp_joingroup(inm)
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struct in_multi *inm;
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{
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register int s = splnet();
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inm->inm_state = IGMP_IDLE_MEMBER;
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if (inm->inm_addr.s_addr == igmp_all_hosts_group ||
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inm->inm_ifp == &loif)
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inm->inm_timer = 0;
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else {
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igmp_sendpkt(inm,fill_rti(inm));
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inm->inm_timer = IGMP_RANDOM_DELAY(
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IGMP_MAX_HOST_REPORT_DELAY*PR_FASTHZ);
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inm->inm_state = IGMP_DELAYING_MEMBER;
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igmp_timers_are_running = 1;
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}
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splx(s);
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}
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void
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igmp_leavegroup(inm)
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struct in_multi *inm;
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{
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/*
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* No action required on leaving a group.
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*/
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switch(inm->inm_state){
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case IGMP_DELAYING_MEMBER:
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case IGMP_IDLE_MEMBER:
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if (!(inm->inm_addr.s_addr == igmp_all_hosts_group ||
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inm->inm_ifp == &loif))
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|
if (inm->inm_rti->type != IGMP_OLD_ROUTER)
|
|
igmp_sendleave(inm);
|
|
break;
|
|
case IGMP_LAZY_MEMBER:
|
|
case IGMP_AWAKENING_MEMBER:
|
|
case IGMP_SLEEPING_MEMBER:
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
igmp_fasttimo()
|
|
{
|
|
register struct in_multi *inm;
|
|
register int s;
|
|
struct in_multistep step;
|
|
|
|
/*
|
|
* Quick check to see if any work needs to be done, in order
|
|
* to minimize the overhead of fasttimo processing.
|
|
*/
|
|
if (!igmp_timers_are_running)
|
|
return;
|
|
|
|
s = splnet();
|
|
igmp_timers_are_running = 0;
|
|
IN_FIRST_MULTI(step, inm);
|
|
while (inm != NULL) {
|
|
if (inm->inm_timer == 0) {
|
|
/* do nothing */
|
|
} else if (--inm->inm_timer == 0) {
|
|
if (inm->inm_state == IGMP_DELAYING_MEMBER) {
|
|
if (inm->inm_rti->type == IGMP_OLD_ROUTER)
|
|
igmp_sendpkt(inm, IGMP_HOST_MEMBERSHIP_REPORT);
|
|
else
|
|
igmp_sendpkt(inm, IGMP_HOST_NEW_MEMBERSHIP_REPORT);
|
|
inm->inm_state = IGMP_IDLE_MEMBER;
|
|
}
|
|
} else {
|
|
igmp_timers_are_running = 1;
|
|
}
|
|
IN_NEXT_MULTI(step, inm);
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
void
|
|
igmp_slowtimo()
|
|
{
|
|
int s = splnet();
|
|
register struct router_info *rti = Head;
|
|
|
|
#ifdef IGMP_DEBUG
|
|
printf("[igmp.c,_slowtimo] -- > entering \n");
|
|
#endif
|
|
while (rti) {
|
|
rti->time ++;
|
|
if (rti->time >= IGMP_AGE_THRESHOLD){
|
|
rti->type = IGMP_NEW_ROUTER;
|
|
rti->time = IGMP_AGE_THRESHOLD;
|
|
}
|
|
rti = rti->next;
|
|
}
|
|
#ifdef IGMP_DEBUG
|
|
printf("[igmp.c,_slowtimo] -- > exiting \n");
|
|
#endif
|
|
splx(s);
|
|
}
|
|
|
|
static void
|
|
igmp_sendpkt(inm, type)
|
|
struct in_multi *inm;
|
|
int type;
|
|
{
|
|
struct mbuf *m;
|
|
struct igmp *igmp;
|
|
struct ip *ip;
|
|
struct ip_moptions *imo;
|
|
|
|
MGETHDR(m, M_DONTWAIT, MT_HEADER);
|
|
if (m == NULL)
|
|
return;
|
|
|
|
MALLOC(imo, struct ip_moptions *, sizeof *imo, M_IPMOPTS, M_DONTWAIT);
|
|
if (!imo) {
|
|
m_free(m);
|
|
return;
|
|
}
|
|
|
|
m->m_pkthdr.rcvif = &loif;
|
|
m->m_pkthdr.len = sizeof(struct ip) + IGMP_MINLEN;
|
|
MH_ALIGN(m, IGMP_MINLEN + sizeof(struct ip));
|
|
m->m_data += sizeof(struct ip);
|
|
m->m_len = IGMP_MINLEN;
|
|
igmp = mtod(m, struct igmp *);
|
|
igmp->igmp_type = type;
|
|
igmp->igmp_code = 0;
|
|
igmp->igmp_group = inm->inm_addr;
|
|
igmp->igmp_cksum = 0;
|
|
igmp->igmp_cksum = in_cksum(m, IGMP_MINLEN);
|
|
|
|
m->m_data -= sizeof(struct ip);
|
|
m->m_len += sizeof(struct ip);
|
|
ip = mtod(m, struct ip *);
|
|
ip->ip_tos = 0;
|
|
ip->ip_len = sizeof(struct ip) + IGMP_MINLEN;
|
|
ip->ip_off = 0;
|
|
ip->ip_p = IPPROTO_IGMP;
|
|
ip->ip_src.s_addr = INADDR_ANY;
|
|
ip->ip_dst = igmp->igmp_group;
|
|
|
|
imo->imo_multicast_ifp = inm->inm_ifp;
|
|
imo->imo_multicast_ttl = 1;
|
|
/*
|
|
* Request loopback of the report if we are acting as a multicast
|
|
* router, so that the process-level routing demon can hear it.
|
|
*/
|
|
imo->imo_multicast_loop = (ip_mrouter != NULL);
|
|
|
|
ip_output(m, (struct mbuf *)0, (struct route *)0, 0, imo);
|
|
|
|
FREE(imo, M_IPMOPTS);
|
|
++igmpstat.igps_snd_reports;
|
|
|
|
}
|
|
|
|
static void
|
|
igmp_sendleave(inm)
|
|
struct in_multi *inm;
|
|
{
|
|
igmp_sendpkt(inm, IGMP_HOST_LEAVE_MESSAGE);
|
|
}
|