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541 lines
16 KiB
C
541 lines
16 KiB
C
/*
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* Copyright (C) 1999 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 Southern California.
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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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* non-commercial 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 Southern
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* California and/or Information Sciences Institute.
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* The name of the University of Southern California may not
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* 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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* THE UNIVERSITY OF SOUTHERN CALIFORNIA 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 USC, 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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* Pavlin Ivanov Radoslavov (pavlin@catarina.usc.edu)
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*
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* $Id: trace.c,v 1.5 1999/09/16 08:46:00 jinmei Exp $
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*/
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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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#include "trace.h"
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/* TODO */
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/*
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* Traceroute function which returns traceroute replies to the requesting
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* router. Also forwards the request to downstream routers.
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*/
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void
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accept_mtrace(src, dst, group, ifindex, data, no, datalen)
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struct sockaddr_in6 *src;
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struct in6_addr *dst;
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struct in6_addr *group;
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int ifindex;
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char *data;
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u_int no; /* promoted u_char */
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int datalen;
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{
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u_char type;
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mrtentry_t *mrt;
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struct tr6_query *qry;
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struct tr6_resp *resp;
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int vifi, ovifi;
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char *p;
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int rcount;
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int errcode = TR_NO_ERR;
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int resptype;
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struct timeval tp;
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struct sioc_mif_req6 mreq;
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struct in6_addr parent_address;
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struct sockaddr_in6 src_sa6 = {sizeof(src_sa6), AF_INET6};
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struct sockaddr_in6 dst_sa6 = {sizeof(dst_sa6), AF_INET6};
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struct sockaddr_in6 resp_sa6 = {sizeof(resp_sa6), AF_INET6};
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struct sockaddr_in6 grp_sa6 = {sizeof(grp_sa6), AF_INET6};
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struct sockaddr_in6 *sa_global;
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#ifdef SM_ONLY
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rpentry_t *rpentry_ptr;
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#endif
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/* Remember qid across invocations */
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static u_int32 oqid = 0;
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/* timestamp the request/response */
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gettimeofday(&tp, 0);
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/*
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* Check if it is a query or a response
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*/
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if (datalen == QLEN) {
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type = QUERY;
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IF_DEBUG(DEBUG_TRACE)
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log(LOG_DEBUG, 0, "Initial traceroute query rcvd "
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"from %s to %s",
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inet6_fmt(&src->sin6_addr),
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inet6_fmt(dst));
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}
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else if ((datalen - QLEN) % RLEN == 0) {
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type = RESP;
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IF_DEBUG(DEBUG_TRACE)
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log(LOG_DEBUG, 0, "In-transit traceroute query rcvd "
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"from %s to %s",
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inet6_fmt(&src->sin6_addr),
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inet6_fmt(dst));
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if (IN6_IS_ADDR_MULTICAST(dst)) {
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IF_DEBUG(DEBUG_TRACE)
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log(LOG_DEBUG, 0, "Dropping multicast response");
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return;
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}
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}
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else {
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log(LOG_WARNING, 0, "%s from %s to %s",
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"Non decipherable traceroute request recieved",
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inet6_fmt(&src->sin6_addr), inet6_fmt(dst));
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return;
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}
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qry = (struct tr6_query *)data;
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src_sa6.sin6_addr = qry->tr_src;
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src_sa6.sin6_scope_id =
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(IN6_IS_ADDR_LINKLOCAL(&qry->tr_src)
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|| IN6_IS_ADDR_MC_LINKLOCAL(&qry->tr_src)) ? ifindex : 0;
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dst_sa6.sin6_addr = qry->tr_dst;
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dst_sa6.sin6_scope_id =
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(IN6_IS_ADDR_LINKLOCAL(&qry->tr_dst)
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|| IN6_IS_ADDR_MC_LINKLOCAL(&qry->tr_dst)) ? ifindex : 0;
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grp_sa6.sin6_addr = *group;
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grp_sa6.sin6_scope_id = 0;
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/*
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* if it is a packet with all reports filled, drop it
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*/
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if ((rcount = (datalen - QLEN)/RLEN) == no) {
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IF_DEBUG(DEBUG_TRACE)
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log(LOG_DEBUG, 0, "packet with all reports filled in");
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return;
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}
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IF_DEBUG(DEBUG_TRACE) {
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log(LOG_DEBUG, 0, "s: %s g: %s d: %s ",
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inet6_fmt(&qry->tr_src),
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inet6_fmt(group), inet6_fmt(&qry->tr_dst));
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log(LOG_DEBUG, 0, "rhlim: %d rd: %s", qry->tr_rhlim,
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inet6_fmt(&qry->tr_raddr));
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log(LOG_DEBUG, 0, "rcount:%d, qid:%06x", rcount, qry->tr_qid);
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}
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/* determine the routing table entry for this traceroute */
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mrt = find_route(&src_sa6, &grp_sa6, MRTF_SG | MRTF_WC | MRTF_PMBR,
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DONT_CREATE);
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IF_DEBUG(DEBUG_TRACE) {
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if (mrt != (mrtentry_t *)NULL) {
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if (mrt->upstream != (pim_nbr_entry_t *)NULL)
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parent_address = mrt->upstream->address.sin6_addr;
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else
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parent_address = in6addr_any;
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log(LOG_DEBUG, 0,
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"mrt parent mif: %d rtr: %s metric: %d",
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mrt->incoming,
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inet6_fmt(&parent_address), mrt->metric);
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/* TODO
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log(LOG_DEBUG, 0, "mrt origin %s",
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RT_FMT(rt, s1));
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*/
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} else
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log(LOG_DEBUG, 0, "...no route");
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}
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/*
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* Query type packet - check if rte exists
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* Check if the query destination is a vif connected to me.
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* and if so, whether I should start response back
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*/
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if (type == QUERY) {
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if (oqid == qry->tr_qid) {
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/*
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* If the multicast router is a member of the group
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* being queried, and the query is multicasted,
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* then the router can recieve multiple copies of
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* the same query. If we have already replied to
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* this traceroute, just ignore it this time.
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*
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* This is not a total solution, but since if this
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* fails you only get N copies, N <= the number of
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* interfaces on the router, it is not fatal.
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*/
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IF_DEBUG(DEBUG_TRACE)
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log(LOG_DEBUG, 0,
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"ignoring duplicate traceroute packet");
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return;
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}
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if (mrt == (mrtentry_t *)NULL) {
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IF_DEBUG(DEBUG_TRACE)
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log(LOG_DEBUG, 0,
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"Mcast traceroute: no route entry %s",
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inet6_fmt(&qry->tr_src));
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#if 0
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if (IN6_IS_ADDR_MULTICAST(dst))
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return;
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#endif
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}
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vifi = find_vif_direct(&dst_sa6);
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if (vifi == NO_VIF) {
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/*
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* The traceroute destination is not on one of
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* my subnet vifs.
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*/
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IF_DEBUG(DEBUG_TRACE)
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log(LOG_DEBUG, 0,
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"Destination %s not an interface",
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inet6_fmt(&qry->tr_dst));
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if (IN6_IS_ADDR_MULTICAST(dst))
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return;
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errcode = TR_WRONG_IF;
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} else if (mrt != (mrtentry_t *)NULL &&
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!IF_ISSET(vifi, &mrt->oifs)) {
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IF_DEBUG(DEBUG_TRACE)
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log(LOG_DEBUG, 0,
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"Destination %s not on forwarding tree "
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"for src %s",
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inet6_fmt(&qry->tr_dst),
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inet6_fmt(&qry->tr_src));
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if (IN6_IS_ADDR_MULTICAST(dst))
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return;
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errcode = TR_WRONG_IF;
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}
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}
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else {
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/*
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* determine which interface the packet came in on
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* RESP packets travel hop-by-hop so this either traversed
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* a tunnel or came from a directly attached mrouter.
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*/
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if ((vifi = find_vif_direct(src)) == NO_VIF) {
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IF_DEBUG(DEBUG_TRACE)
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log(LOG_DEBUG, 0,
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"Wrong interface for packet");
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errcode = TR_WRONG_IF;
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}
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}
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/* Now that we've decided to send a response, save the qid */
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oqid = qry->tr_qid;
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IF_DEBUG(DEBUG_TRACE)
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log(LOG_DEBUG, 0, "Sending traceroute response");
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/* copy the packet to the sending buffer */
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p = mld6_send_buf + sizeof(struct mld6_hdr);
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bcopy(data, p, datalen);
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p += datalen;
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/*
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* If there is no room to insert our reply, coopt the previous hop
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* error indication to relay this fact.
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*/
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if (p + sizeof(struct tr6_resp) > mld6_send_buf + RECV_BUF_SIZE) {
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resp = (struct tr6_resp *)p - 1;
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resp->tr_rflags = TR_NO_SPACE;
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mrt = NULL;
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goto sendit;
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}
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/*
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* fill in initial response fields
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*/
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resp = (struct tr6_resp *)p;
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bzero(resp, sizeof(struct tr6_resp));
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datalen += (RLEN + sizeof(struct mld6_hdr));
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resp->tr_qarr = htonl(((tp.tv_sec + JAN_1970) << 16) +
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((tp.tv_usec << 10) / 15625));
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resp->tr_rproto = PROTO_PIM;
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resp->tr_outifid = (vifi == NO_VIF) ? TR_NO_VIF : htonl(vifi);
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resp->tr_rflags = errcode;
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if ((sa_global = max_global_address()) == NULL) /* impossible */
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log(LOG_ERR, 0, "acept_mtrace: max_global_address returns NULL");
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resp->tr_lcladdr = sa_global->sin6_addr;
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/*
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* obtain # of packets out on interface
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*/
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mreq.mifi = vifi;
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if (vifi != NO_VIF &&
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ioctl(udp_socket, SIOCGETMIFCNT_IN6, (char *)&mreq) >= 0)
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resp->tr_vifout = htonl(mreq.ocount);
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else
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resp->tr_vifout = 0xffffffff;
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/*
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* fill in scoping & pruning information
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*/
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/* TODO */
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#if 0
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if (mrt != (mrtentry_t *)NULL)
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for (gt = rt->rt_groups; gt; gt = gt->gt_next) {
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if (gt->gt_mcastgrp >= group)
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break;
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}
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else
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gt = NULL;
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if (gt && gt->gt_mcastgrp == group) {
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struct stable *st;
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for (st = gt->gt_srctbl; st; st = st->st_next)
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if (qry->tr_src == st->st_origin)
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break;
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sg_req.src.s_addr = qry->tr_src;
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sg_req.grp.s_addr = group;
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if (st && st->st_ctime != 0 &&
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ioctl(udp_socket, SIOCGETSGCNT, (char *)&sg_req) >= 0)
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resp->tr_pktcnt = htonl(sg_req.pktcnt + st->st_savpkt);
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else
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resp->tr_pktcnt = htonl(st ? st->st_savpkt : 0xffffffff);
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if (VIFM_ISSET(vifi, gt->gt_scope))
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resp->tr_rflags = TR_SCOPED;
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else if (gt->gt_prsent_timer)
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resp->tr_rflags = TR_PRUNED;
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else if (!VIFM_ISSET(vifi, gt->gt_grpmems))
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if (VIFM_ISSET(vifi, rt->rt_children) &&
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NBRM_ISSETMASK(uvifs[vifi].uv_nbrmap,
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rt->rt_subordinates)) /*XXX*/
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resp->tr_rflags = TR_OPRUNED;
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else
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resp->tr_rflags = TR_NO_FWD;
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} else {
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if (scoped_addr(vifi, group))
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resp->tr_rflags = TR_SCOPED;
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else if (rt && !VIFM_ISSET(vifi, rt->rt_children))
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resp->tr_rflags = TR_NO_FWD;
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}
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#endif /* 0 */
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/*
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* if no rte exists, set NO_RTE error
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*/
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if (mrt == (mrtentry_t *)NULL) {
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src->sin6_addr = *dst; /* the dst address of resp. pkt */
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resp->tr_inifid = TR_NO_VIF;
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resp->tr_rflags = TR_NO_RTE;
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memset(&resp->tr_rmtaddr, 0, sizeof(struct in6_addr));
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} else {
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/* get # of packets in on interface */
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mreq.mifi = mrt->incoming;
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if (ioctl(udp_socket, SIOCGETMIFCNT_IN6, (char *)&mreq) >= 0)
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resp->tr_vifin = htonl(mreq.icount);
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else
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resp->tr_vifin = 0xffffffff;
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|
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/*
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* TODO
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* MASK_TO_VAL(rt->rt_originmask, resp->tr_smask);
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*/
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resp->tr_inifid = htonl(mrt->incoming);
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if (mrt->upstream != (pim_nbr_entry_t *)NULL)
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parent_address = mrt->upstream->address.sin6_addr;
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else
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parent_address = in6addr_any;
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|
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resp->tr_rmtaddr = parent_address;
|
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if (!IF_ISSET(vifi, &mrt->oifs)) {
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IF_DEBUG(DEBUG_TRACE)
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log(LOG_DEBUG, 0,
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"Destination %s not on forwarding tree "
|
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"for src %s",
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inet6_fmt(&qry->tr_dst),
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inet6_fmt(&qry->tr_src));
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resp->tr_rflags = TR_WRONG_IF;
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}
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#if 0
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if (rt->rt_metric >= UNREACHABLE) {
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resp->tr_rflags = TR_NO_RTE;
|
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/* Hack to send reply directly */
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rt = NULL;
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}
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#endif /* 0 */
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}
|
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|
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#ifdef SM_ONLY
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/*
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* If we're the RP for the trace group, note it.
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*/
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rpentry_ptr = rp_match(&grp_sa6);
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if (rpentry_ptr && local_address(&rpentry_ptr->address) != NO_VIF)
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resp->tr_rflags = TR_RP;
|
|
#endif /* SM_ONLY */
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|
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sendit:
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/*
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|
* if metric is 1 or no. of reports is 1, send response to requestor
|
|
* else send to upstream router. If the upstream router can't handle
|
|
* mtrace, set an error code and send to requestor anyway.
|
|
*/
|
|
IF_DEBUG(DEBUG_TRACE)
|
|
log(LOG_DEBUG, 0, "rcount:%d, no:%d", rcount, no);
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|
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ovifi = NO_VIF; /* unspecified */
|
|
if ((rcount + 1 == no) || (mrt == NULL) || (mrt->metric == 1)) {
|
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resptype = MLD6_MTRACE_RESP;
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resp_sa6.sin6_addr = qry->tr_raddr;
|
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if (IN6_IS_ADDR_LINKLOCAL(&resp_sa6.sin6_addr) ||
|
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IN6_IS_ADDR_MC_LINKLOCAL(&resp_sa6.sin6_addr)) {
|
|
if ((ovifi = find_vif_direct(&dst_sa6)) == NO_VIF) {
|
|
log(LOG_INFO, 0,
|
|
"can't determine outgoing i/f for mtrace "
|
|
"response.");
|
|
return;
|
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}
|
|
}
|
|
} else
|
|
/* TODO */
|
|
{
|
|
#if 0
|
|
if (!can_mtrace(rt->rt_parent, rt->rt_gateway)) {
|
|
resp_sa6.sin6_addr = qry->tr_raddr;
|
|
resp->tr_rflags = TR_OLD_ROUTER;
|
|
resptype = MLD6_MTRACE_RESP;
|
|
} else
|
|
#endif /* 0 */
|
|
#ifdef SM_ONLY
|
|
if (mrt->incoming &&
|
|
(uvifs[mrt->incoming].uv_flags & MIFF_REGISTER)) {
|
|
log(LOG_DEBUG, 0,
|
|
"incoming i/f is for register. "
|
|
"Can't be forwarded anymore.");
|
|
resp_sa6.sin6_addr = qry->tr_raddr;
|
|
resptype = MLD6_MTRACE_RESP;
|
|
} else
|
|
#endif /* SM_ONLY */
|
|
{
|
|
if (mrt->upstream != (pim_nbr_entry_t *)NULL)
|
|
parent_address =
|
|
mrt->upstream->address.sin6_addr;
|
|
else
|
|
parent_address = allrouters_group.sin6_addr;
|
|
resp_sa6.sin6_addr = parent_address;
|
|
ovifi = mrt->incoming;
|
|
resptype = MLD6_MTRACE;
|
|
}
|
|
}
|
|
|
|
if (IN6_IS_ADDR_MULTICAST(&resp_sa6.sin6_addr)) {
|
|
struct sockaddr_in6 *sa6;
|
|
|
|
/*
|
|
* Send the reply on a known multicast capable vif.
|
|
* If we don't have one, we can't source any
|
|
* multicasts anyway.
|
|
*/
|
|
if (IN6_IS_ADDR_MC_LINKLOCAL(&resp_sa6.sin6_addr)) {
|
|
sa6 = &uvifs[ovifi].uv_linklocal->pa_addr;
|
|
ifindex = uvifs[ovifi].uv_ifindex;
|
|
}
|
|
else {
|
|
if (phys_vif != -1 &&
|
|
(sa6 = uv_global(phys_vif)) != NULL) {
|
|
IF_DEBUG(DEBUG_TRACE)
|
|
log(LOG_DEBUG, 0,
|
|
"Sending reply to %s from %s",
|
|
inet6_fmt(dst),
|
|
inet6_fmt(&sa6->sin6_addr));
|
|
ifindex = uvifs[phys_vif].uv_ifindex;
|
|
}
|
|
else {
|
|
log(LOG_INFO, 0, "No enabled phyints -- %s",
|
|
"dropping traceroute reply");
|
|
return;
|
|
}
|
|
}
|
|
k_set_hlim(mld6_socket, qry->tr_rhlim);
|
|
send_mld6(resptype, no, sa6, &resp_sa6, group,
|
|
ifindex, 0, datalen, 0);
|
|
k_set_hlim(mld6_socket, 1);
|
|
} else {
|
|
struct sockaddr_in6 *sa6 = NULL;
|
|
ifindex = -1; /* unspecified by default */
|
|
|
|
if (IN6_IS_ADDR_LINKLOCAL(&resp_sa6.sin6_addr)) {
|
|
/* ovifi must be valid in this case */
|
|
ifindex = uvifs[ovifi].uv_ifindex;
|
|
sa6 = &uvifs[ovifi].uv_linklocal->pa_addr;
|
|
}
|
|
|
|
IF_DEBUG(DEBUG_TRACE)
|
|
log(LOG_DEBUG, 0, "Sending %s to %s from %s",
|
|
resptype == MLD6_MTRACE_RESP ?
|
|
"reply" : "request on",
|
|
inet6_fmt(dst),
|
|
sa6 ? inet6_fmt(&sa6->sin6_addr) : "unspecified");
|
|
|
|
send_mld6(resptype, no, sa6, &resp_sa6, group, ifindex,
|
|
0, datalen, 0);
|
|
}
|
|
return;
|
|
}
|