524 lines
14 KiB
C
524 lines
14 KiB
C
/*
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* Copyright (C) 1998 WIDE Project.
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* All rights reserved.
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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. Neither the name of the project 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 PROJECT 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 PROJECT 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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/*
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* Copyright (c) 1998 by the University of Oregon.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation in source and binary forms for lawful
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* purposes and without fee is hereby granted, provided
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* that the above copyright notice appear in all copies and that both
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* the copyright notice and this permission notice appear in supporting
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* documentation, and that any documentation, advertising materials,
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* and other materials related to such distribution and use acknowledge
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* that the software was developed by the University of Oregon.
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* The name of the University of Oregon may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THE UNIVERSITY OF OREGON DOES NOT MAKE ANY REPRESENTATIONS
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* ABOUT THE SUITABILITY OF THIS SOFTWARE FOR ANY PURPOSE. THIS SOFTWARE IS
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* PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND
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* NON-INFRINGEMENT.
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*
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* IN NO EVENT SHALL UO, OR ANY OTHER CONTRIBUTOR BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT,
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* TORT, OR OTHER FORM OF ACTION, ARISING OUT OF OR IN CONNECTION WITH,
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* THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Other copyrights might apply to parts of this software and are so
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* noted when applicable.
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*/
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/*
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* Questions concerning this software should be directed to
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* Kurt Windisch (kurtw@antc.uoregon.edu)
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*
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* $Id: mld6_proto.c,v 1.5 2000/10/05 22:20:38 itojun Exp $
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*/
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/*
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* Part of this program has been derived from PIM sparse-mode pimd.
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* The pimd program is covered by the license in the accompanying file
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* named "LICENSE.pimd".
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*
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* The pimd program is COPYRIGHT 1998 by University of Southern California.
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*
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* Part of this program has been derived from mrouted.
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* The mrouted program is covered by the license in the accompanying file
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* named "LICENSE.mrouted".
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*
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* The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
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* Leland Stanford Junior University.
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*
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* $FreeBSD$
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*/
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#include "defs.h"
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extern struct in6_addr in6addr_any;
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typedef struct {
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mifi_t mifi;
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struct listaddr *g;
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int q_time;
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} cbk_t;
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/*
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* Forward declarations.
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*/
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static void DelVif __P((void *arg));
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static int SetTimer __P((int mifi, struct listaddr *g));
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static int DeleteTimer __P((int id));
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static void SendQuery __P((void *arg));
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static int SetQueryTimer __P((struct listaddr *g, int mifi, int to_expire,
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int q_time));
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/*
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* Send group membership queries on that interface if I am querier.
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*/
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void
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query_groups(v)
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register struct uvif *v;
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{
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register struct listaddr *g;
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v->uv_gq_timer = MLD6_QUERY_INTERVAL;
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if (v->uv_flags & VIFF_QUERIER && (v->uv_flags & VIFF_NOLISTENER) == 0)
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send_mld6(MLD6_LISTENER_QUERY, 0, &v->uv_linklocal->pa_addr,
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NULL, (struct in6_addr *)&in6addr_any,
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v->uv_ifindex, MLD6_QUERY_RESPONSE_INTERVAL, 0, 1);
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/*
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* Decrement the old-hosts-present timer for each
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* active group on that vif.
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*/
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for (g = v->uv_groups; g != NULL; g = g->al_next)
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if (g->al_old > TIMER_INTERVAL)
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g->al_old -= TIMER_INTERVAL;
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else
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g->al_old = 0;
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}
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/*
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* Process an incoming host membership query
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*/
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void
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accept_listener_query(src, dst, group, tmo)
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struct sockaddr_in6 *src;
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struct in6_addr *dst, *group;
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int tmo;
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{
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register int mifi;
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register struct uvif *v;
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struct sockaddr_in6 group_sa = {sizeof(group_sa), AF_INET6};
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/* Ignore my own membership query */
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if (local_address(src) != NO_VIF)
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return;
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if ((mifi = find_vif_direct(src)) == NO_VIF) {
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IF_DEBUG(DEBUG_MLD)
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log(LOG_INFO, 0,
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"accept_listener_query: can't find a mif");
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return;
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}
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v = &uvifs[mifi];
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if (v->uv_querier == NULL || !inet6_equal(&v->uv_querier->al_addr, src))
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{
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/*
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* This might be:
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* - A query from a new querier, with a lower source address
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* than the current querier (who might be me)
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* - A query from a new router that just started up and doesn't
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* know who the querier is.
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* - A query from the current querier
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*/
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if (inet6_lessthan(src, (v->uv_querier ? &v->uv_querier->al_addr
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: &v->uv_linklocal->pa_addr))) {
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IF_DEBUG(DEBUG_MLD)
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log(LOG_DEBUG, 0, "new querier %s (was %s) "
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"on mif %d",
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inet6_fmt(&src->sin6_addr),
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v->uv_querier ?
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inet6_fmt(&v->uv_querier->al_addr.sin6_addr) :
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"me", mifi);
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if (!v->uv_querier) {
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v->uv_querier = (struct listaddr *)
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malloc(sizeof(struct listaddr));
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memset(v->uv_querier, 0,
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sizeof(struct listaddr));
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}
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v->uv_flags &= ~VIFF_QUERIER;
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v->uv_querier->al_addr = *src;
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time(&v->uv_querier->al_ctime);
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}
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}
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/*
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* Reset the timer since we've received a query.
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*/
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if (v->uv_querier && inet6_equal(src, &v->uv_querier->al_addr))
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v->uv_querier->al_timer = MLD6_OTHER_QUERIER_PRESENT_INTERVAL;
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/*
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* If this is a Group-Specific query which we did not source,
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* we must set our membership timer to [Last Member Query Count] *
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* the [Max Response Time] in the packet.
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*/
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if (!IN6_IS_ADDR_UNSPECIFIED(group) &&
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inet6_equal(src, &v->uv_linklocal->pa_addr)) {
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register struct listaddr *g;
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IF_DEBUG(DEBUG_MLD)
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log(LOG_DEBUG, 0,
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"%s for %s from %s on mif %d, timer %d",
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"Group-specific membership query",
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inet6_fmt(group),
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inet6_fmt(&src->sin6_addr), mifi, tmo);
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group_sa.sin6_addr = *group;
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group_sa.sin6_scope_id = inet6_uvif2scopeid(&group_sa, v);
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for (g = v->uv_groups; g != NULL; g = g->al_next) {
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if (inet6_equal(&group_sa, &g->al_addr)
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&& g->al_query == 0) {
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/* setup a timeout to remove the group membership */
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if (g->al_timerid)
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g->al_timerid = DeleteTimer(g->al_timerid);
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g->al_timer = MLD6_LAST_LISTENER_QUERY_COUNT *
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tmo / MLD6_TIMER_SCALE;
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/*
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* use al_query to record our presence
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* in last-member state
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*/
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g->al_query = -1;
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g->al_timerid = SetTimer(mifi, g);
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IF_DEBUG(DEBUG_MLD)
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log(LOG_DEBUG, 0,
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"timer for grp %s on mif %d "
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"set to %ld",
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inet6_fmt(group),
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mifi, g->al_timer);
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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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/*
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* Process an incoming group membership report.
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*/
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void
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accept_listener_report(src, dst, group)
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struct sockaddr_in6 *src;
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struct in6_addr *dst, *group;
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{
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register mifi_t mifi;
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register struct uvif *v;
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register struct listaddr *g;
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struct sockaddr_in6 group_sa = {sizeof(group_sa), AF_INET6};
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if (IN6_IS_ADDR_MC_LINKLOCAL(group)) {
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IF_DEBUG(DEBUG_MLD)
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log(LOG_DEBUG, 0,
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"accept_listener_report: group(%s) has the "
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"link-local scope. discard", inet6_fmt(group));
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return;
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}
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if ((mifi = find_vif_direct_local(src)) == NO_VIF) {
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IF_DEBUG(DEBUG_MLD)
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log(LOG_INFO, 0,
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"accept_listener_report: can't find a mif");
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return;
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}
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IF_DEBUG(DEBUG_MLD)
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log(LOG_INFO, 0,
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"accepting multicast listener report: "
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"src %s, dst %s, grp %s",
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inet6_fmt(&src->sin6_addr), inet6_fmt(dst),
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inet6_fmt(group));
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v = &uvifs[mifi];
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/*
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* Look for the group in our group list; if found, reset its timer.
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*/
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group_sa.sin6_addr = *group;
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group_sa.sin6_scope_id = inet6_uvif2scopeid(&group_sa, v);
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for (g = v->uv_groups; g != NULL; g = g->al_next) {
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if (inet6_equal(&group_sa, &g->al_addr)) {
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g->al_reporter = *src;
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/* delete old timers, set a timer for expiration */
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g->al_timer = MLD6_LISTENER_INTERVAL;
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if (g->al_query)
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g->al_query = DeleteTimer(g->al_query);
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if (g->al_timerid)
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g->al_timerid = DeleteTimer(g->al_timerid);
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g->al_timerid = SetTimer(mifi, g);
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add_leaf(mifi, NULL, &group_sa);
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break;
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}
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}
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/*
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* If not found, add it to the list and update kernel cache.
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*/
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if (g == NULL) {
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g = (struct listaddr *)malloc(sizeof(struct listaddr));
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if (g == NULL)
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log(LOG_ERR, 0, "ran out of memory"); /* fatal */
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g->al_addr = group_sa;
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g->al_old = 0;
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/** set a timer for expiration **/
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g->al_query = 0;
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g->al_timer = MLD6_LISTENER_INTERVAL;
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g->al_reporter = *src;
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g->al_timerid = SetTimer(mifi, g);
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g->al_next = v->uv_groups;
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v->uv_groups = g;
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time(&g->al_ctime);
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add_leaf(mifi, NULL, &group_sa);
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}
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}
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/* TODO: send PIM prune message if the last member? */
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void
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accept_listener_done(src, dst, group)
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struct sockaddr_in6 *src;
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struct in6_addr *dst, *group;
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{
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register mifi_t mifi;
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register struct uvif *v;
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register struct listaddr *g;
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struct sockaddr_in6 group_sa = {sizeof(group_sa), AF_INET6};
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if ((mifi = find_vif_direct_local(src)) == NO_VIF) {
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IF_DEBUG(DEBUG_MLD)
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log(LOG_INFO, 0,
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"accept_listener_done: can't find a mif");
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return;
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}
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IF_DEBUG(DEBUG_MLD)
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log(LOG_INFO, 0,
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"accepting listener done message: src %s, dst %s, grp %s",
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inet6_fmt(&src->sin6_addr),
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inet6_fmt(dst), inet6_fmt(group));
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v = &uvifs[mifi];
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if (!(v->uv_flags & (VIFF_QUERIER | VIFF_DR)))
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return;
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/*
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* Look for the group in our group list in order to set up a
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* short-timeout query.
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*/
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group_sa.sin6_addr = *group;
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group_sa.sin6_scope_id = inet6_uvif2scopeid(&group_sa, v);
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for (g = v->uv_groups; g != NULL; g = g->al_next) {
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if (inet6_equal(&group_sa, &g->al_addr)) {
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IF_DEBUG(DEBUG_MLD)
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log(LOG_DEBUG, 0,
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"[accept_done_message] %d %ld\n",
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g->al_old, g->al_query);
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/*
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* Ignore the done message if there are old
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* hosts present
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*/
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if (g->al_old)
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return;
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/*
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* still waiting for a reply to a query,
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* ignore the done
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*/
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if (g->al_query)
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return;
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/** delete old timer set a timer for expiration **/
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if (g->al_timerid)
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g->al_timerid = DeleteTimer(g->al_timerid);
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/** send a group specific querry **/
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g->al_timer = (MLD6_LAST_LISTENER_QUERY_INTERVAL/MLD6_TIMER_SCALE) *
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(MLD6_LAST_LISTENER_QUERY_COUNT + 1);
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if (v->uv_flags & VIFF_QUERIER &&
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(v->uv_flags & VIFF_NOLISTENER) == 0)
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send_mld6(MLD6_LISTENER_QUERY, 0,
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&v->uv_linklocal->pa_addr, NULL,
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&g->al_addr.sin6_addr,
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v->uv_ifindex,
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MLD6_LAST_LISTENER_QUERY_INTERVAL, 0, 1);
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g->al_query = SetQueryTimer(g, mifi,
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MLD6_LAST_LISTENER_QUERY_INTERVAL/MLD6_TIMER_SCALE,
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MLD6_LAST_LISTENER_QUERY_INTERVAL);
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g->al_timerid = SetTimer(mifi, g);
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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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* Time out record of a group membership on a vif
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*/
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static void
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DelVif(arg)
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void *arg;
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{
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cbk_t *cbk = (cbk_t *)arg;
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mifi_t mifi = cbk->mifi;
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struct uvif *v = &uvifs[mifi];
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struct listaddr *a, **anp, *g = cbk->g;
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/*
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* Group has expired
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* delete all kernel cache entries with this group
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*/
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if (g->al_query)
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DeleteTimer(g->al_query);
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delete_leaf(mifi, NULL, &g->al_addr);
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anp = &(v->uv_groups);
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while ((a = *anp) != NULL) {
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if (a == g) {
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*anp = a->al_next;
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free((char *)a);
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} else {
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anp = &a->al_next;
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}
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}
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free(cbk);
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}
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/*
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* Set a timer to delete the record of a group membership on a vif.
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*/
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static int
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SetTimer(mifi, g)
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mifi_t mifi;
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struct listaddr *g;
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{
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cbk_t *cbk;
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cbk = (cbk_t *) malloc(sizeof(cbk_t));
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cbk->mifi = mifi;
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cbk->g = g;
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return timer_setTimer(g->al_timer, DelVif, cbk);
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}
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/*
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* Delete a timer that was set above.
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*/
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static int
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DeleteTimer(id)
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int id;
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{
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timer_clearTimer(id);
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return 0;
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}
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/*
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* Send a group-specific query.
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*/
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static void
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SendQuery(arg)
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void *arg;
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{
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cbk_t *cbk = (cbk_t *)arg;
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register struct uvif *v = &uvifs[cbk->mifi];
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if (v->uv_flags & VIFF_QUERIER && (v->uv_flags & VIFF_NOLISTENER) == 0)
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send_mld6(MLD6_LISTENER_QUERY, 0, &v->uv_linklocal->pa_addr,
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NULL, &cbk->g->al_addr.sin6_addr,
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v->uv_ifindex, cbk->q_time, 0, 1);
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cbk->g->al_query = 0;
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free(cbk);
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}
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/*
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* Set a timer to send a group-specific query.
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*/
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static int
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SetQueryTimer(g, mifi, to_expire, q_time)
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struct listaddr *g;
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mifi_t mifi;
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int to_expire;
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int q_time;
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{
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cbk_t *cbk;
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cbk = (cbk_t *) malloc(sizeof(cbk_t));
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cbk->g = g;
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cbk->q_time = q_time;
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cbk->mifi = mifi;
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return timer_setTimer(to_expire, SendQuery, cbk);
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}
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/* Checks for MLD listener: returns TRUE if there is a receiver for the
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* group on the given uvif, or returns FALSE otherwise.
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*/
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int
|
|
check_multicast_listener(v, group)
|
|
struct uvif *v;
|
|
struct sockaddr_in6 *group;
|
|
{
|
|
register struct listaddr *g;
|
|
|
|
/*
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|
* Look for the group in our listener list;
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|
*/
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|
for (g = v->uv_groups; g != NULL; g = g->al_next) {
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|
if (inet6_equal(group, &g->al_addr))
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|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|