2908 lines
75 KiB
C
2908 lines
75 KiB
C
/* $NetBSD: icmp6.c,v 1.96 2003/08/07 16:33:22 agc Exp $ */
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/* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 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) 1982, 1986, 1988, 1993
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* The Regents of the University of California. 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 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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* @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: icmp6.c,v 1.96 2003/08/07 16:33:22 agc Exp $");
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#include "opt_inet.h"
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#include "opt_ipsec.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/syslog.h>
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#include <sys/domain.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/icmp6.h>
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#include <netinet6/mld6_var.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/nd6.h>
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#include <netinet6/in6_ifattach.h>
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#include <netinet6/ip6protosw.h>
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#ifdef IPSEC
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#include <netinet6/ipsec.h>
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#include <netkey/key.h>
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#endif
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#include "faith.h"
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#if defined(NFAITH) && 0 < NFAITH
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#include <net/if_faith.h>
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#endif
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#include <net/net_osdep.h>
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extern struct domain inet6domain;
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struct icmp6stat icmp6stat;
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extern struct in6pcb rawin6pcb;
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extern int icmp6errppslim;
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static int icmp6errpps_count = 0;
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static struct timeval icmp6errppslim_last;
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extern int icmp6_nodeinfo;
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/*
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* List of callbacks to notify when Path MTU changes are made.
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*/
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struct icmp6_mtudisc_callback {
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LIST_ENTRY(icmp6_mtudisc_callback) mc_list;
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void (*mc_func) __P((struct in6_addr *));
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};
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LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks =
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LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks);
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static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL;
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extern int pmtu_expire;
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/* XXX do these values make any sense? */
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static int icmp6_mtudisc_hiwat = 1280;
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static int icmp6_mtudisc_lowat = 256;
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/*
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* keep track of # of redirect routes.
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*/
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static struct rttimer_queue *icmp6_redirect_timeout_q = NULL;
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/* XXX experimental, turned off */
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static int icmp6_redirect_hiwat = -1;
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static int icmp6_redirect_lowat = -1;
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static void icmp6_errcount __P((struct icmp6errstat *, int, int));
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static int icmp6_rip6_input __P((struct mbuf **, int));
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static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int));
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static const char *icmp6_redirect_diag __P((struct in6_addr *,
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struct in6_addr *, struct in6_addr *));
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static struct mbuf *ni6_input __P((struct mbuf *, int));
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static struct mbuf *ni6_nametodns __P((const char *, int, int));
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static int ni6_dnsmatch __P((const char *, int, const char *, int));
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static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
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struct ifnet **, char *));
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static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
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struct ifnet *, int));
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static int icmp6_notify_error __P((struct mbuf *, int, int, int));
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static struct rtentry *icmp6_mtudisc_clone __P((struct sockaddr *));
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static void icmp6_mtudisc_timeout __P((struct rtentry *, struct rttimer *));
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static void icmp6_redirect_timeout __P((struct rtentry *, struct rttimer *));
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void
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icmp6_init()
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{
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mld6_init();
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icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire);
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icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout);
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}
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static void
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icmp6_errcount(stat, type, code)
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struct icmp6errstat *stat;
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int type, code;
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{
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switch (type) {
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case ICMP6_DST_UNREACH:
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switch (code) {
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case ICMP6_DST_UNREACH_NOROUTE:
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stat->icp6errs_dst_unreach_noroute++;
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return;
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case ICMP6_DST_UNREACH_ADMIN:
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stat->icp6errs_dst_unreach_admin++;
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return;
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case ICMP6_DST_UNREACH_BEYONDSCOPE:
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stat->icp6errs_dst_unreach_beyondscope++;
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return;
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case ICMP6_DST_UNREACH_ADDR:
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stat->icp6errs_dst_unreach_addr++;
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return;
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case ICMP6_DST_UNREACH_NOPORT:
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stat->icp6errs_dst_unreach_noport++;
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return;
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}
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break;
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case ICMP6_PACKET_TOO_BIG:
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stat->icp6errs_packet_too_big++;
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return;
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case ICMP6_TIME_EXCEEDED:
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switch (code) {
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case ICMP6_TIME_EXCEED_TRANSIT:
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stat->icp6errs_time_exceed_transit++;
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return;
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case ICMP6_TIME_EXCEED_REASSEMBLY:
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stat->icp6errs_time_exceed_reassembly++;
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return;
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}
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break;
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case ICMP6_PARAM_PROB:
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switch (code) {
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case ICMP6_PARAMPROB_HEADER:
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stat->icp6errs_paramprob_header++;
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return;
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case ICMP6_PARAMPROB_NEXTHEADER:
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stat->icp6errs_paramprob_nextheader++;
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return;
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case ICMP6_PARAMPROB_OPTION:
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stat->icp6errs_paramprob_option++;
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return;
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}
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break;
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case ND_REDIRECT:
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stat->icp6errs_redirect++;
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return;
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}
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stat->icp6errs_unknown++;
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}
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/*
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* Register a Path MTU Discovery callback.
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*/
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void
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icmp6_mtudisc_callback_register(func)
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void (*func) __P((struct in6_addr *));
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{
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struct icmp6_mtudisc_callback *mc;
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for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL;
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mc = LIST_NEXT(mc, mc_list)) {
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if (mc->mc_func == func)
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return;
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}
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mc = malloc(sizeof(*mc), M_PCB, M_NOWAIT);
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if (mc == NULL)
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panic("icmp6_mtudisc_callback_register");
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mc->mc_func = func;
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LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, mc, mc_list);
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}
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/*
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* Generate an error packet of type error in response to bad IP6 packet.
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*/
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void
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icmp6_error(m, type, code, param)
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struct mbuf *m;
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int type, code, param;
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{
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struct ip6_hdr *oip6, *nip6;
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struct icmp6_hdr *icmp6;
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u_int preplen;
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int off;
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int nxt;
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icmp6stat.icp6s_error++;
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/* count per-type-code statistics */
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icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
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if (m->m_flags & M_DECRYPTED) {
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icmp6stat.icp6s_canterror++;
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goto freeit;
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}
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if (m->m_len < sizeof(struct ip6_hdr)) {
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m = m_pullup(m, sizeof(struct ip6_hdr));
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if (m == NULL)
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return;
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}
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oip6 = mtod(m, struct ip6_hdr *);
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/*
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* If the destination address of the erroneous packet is a multicast
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* address, or the packet was sent using link-layer multicast,
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* we should basically suppress sending an error (RFC 2463, Section
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* 2.4).
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* We have two exceptions (the item e.2 in that section):
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* - the Pakcet Too Big message can be sent for path MTU discovery.
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* - the Parameter Problem Message that can be allowed an icmp6 error
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* in the option type field. This check has been done in
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* ip6_unknown_opt(), so we can just check the type and code.
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*/
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if ((m->m_flags & (M_BCAST|M_MCAST) ||
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IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
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(type != ICMP6_PACKET_TOO_BIG &&
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(type != ICMP6_PARAM_PROB ||
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code != ICMP6_PARAMPROB_OPTION)))
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goto freeit;
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/*
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* RFC 2463, 2.4 (e.5): source address check.
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* XXX: the case of anycast source?
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*/
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if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
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IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
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goto freeit;
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/*
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* If we are about to send ICMPv6 against ICMPv6 error/redirect,
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* don't do it.
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*/
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nxt = -1;
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off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
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if (off >= 0 && nxt == IPPROTO_ICMPV6) {
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struct icmp6_hdr *icp;
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IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
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sizeof(*icp));
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if (icp == NULL) {
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icmp6stat.icp6s_tooshort++;
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return;
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}
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if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
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icp->icmp6_type == ND_REDIRECT) {
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/*
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* ICMPv6 error
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* Special case: for redirect (which is
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* informational) we must not send icmp6 error.
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*/
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icmp6stat.icp6s_canterror++;
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goto freeit;
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} else {
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/* ICMPv6 informational - send the error */
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}
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}
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#if 0 /* controversial */
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else if (off >= 0 && nxt == IPPROTO_ESP) {
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/*
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* It could be ICMPv6 error inside ESP. Take a safer side,
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* don't respond.
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*/
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icmp6stat.icp6s_canterror++;
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goto freeit;
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}
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#endif
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else {
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/* non-ICMPv6 - send the error */
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}
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oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
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/* Finally, do rate limitation check. */
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if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
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icmp6stat.icp6s_toofreq++;
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goto freeit;
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}
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/*
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* OK, ICMP6 can be generated.
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*/
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if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
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m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
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preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
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M_PREPEND(m, preplen, M_DONTWAIT);
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if (m && m->m_len < preplen)
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m = m_pullup(m, preplen);
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if (m == NULL) {
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nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
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return;
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}
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|
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nip6 = mtod(m, struct ip6_hdr *);
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nip6->ip6_src = oip6->ip6_src;
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nip6->ip6_dst = oip6->ip6_dst;
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|
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if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
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oip6->ip6_src.s6_addr16[1] = 0;
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if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
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oip6->ip6_dst.s6_addr16[1] = 0;
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|
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icmp6 = (struct icmp6_hdr *)(nip6 + 1);
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icmp6->icmp6_type = type;
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icmp6->icmp6_code = code;
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icmp6->icmp6_pptr = htonl((u_int32_t)param);
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|
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/*
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* icmp6_reflect() is designed to be in the input path.
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* icmp6_error() can be called from both input and outut path,
|
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* and if we are in output path rcvif could contain bogus value.
|
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* clear m->m_pkthdr.rcvif for safety, we should have enough scope
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* information in ip header (nip6).
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*/
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m->m_pkthdr.rcvif = NULL;
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|
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icmp6stat.icp6s_outhist[type]++;
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icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
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|
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return;
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|
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freeit:
|
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/*
|
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* If we can't tell wheter or not we can generate ICMP6, free it.
|
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*/
|
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m_freem(m);
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}
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|
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/*
|
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* Process a received ICMP6 message.
|
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*/
|
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int
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icmp6_input(mp, offp, proto)
|
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struct mbuf **mp;
|
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int *offp, proto;
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{
|
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struct mbuf *m = *mp, *n;
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struct ip6_hdr *ip6, *nip6;
|
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struct icmp6_hdr *icmp6, *nicmp6;
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int off = *offp;
|
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int icmp6len = m->m_pkthdr.len - *offp;
|
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int code, sum, noff;
|
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|
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icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
|
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|
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/*
|
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* Locate icmp6 structure in mbuf, and check
|
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* that not corrupted and of at least minimum length
|
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*/
|
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|
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ip6 = mtod(m, struct ip6_hdr *);
|
|
if (icmp6len < sizeof(struct icmp6_hdr)) {
|
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icmp6stat.icp6s_tooshort++;
|
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icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
|
|
goto freeit;
|
|
}
|
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|
|
/*
|
|
* calculate the checksum
|
|
*/
|
|
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
|
|
if (icmp6 == NULL) {
|
|
icmp6stat.icp6s_tooshort++;
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
|
|
return IPPROTO_DONE;
|
|
}
|
|
KASSERT(IP6_HDR_ALIGNED_P(icmp6));
|
|
code = icmp6->icmp6_code;
|
|
|
|
if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 checksum error(%d|%x) %s\n",
|
|
icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
|
|
icmp6stat.icp6s_checksum++;
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
|
|
goto freeit;
|
|
}
|
|
|
|
#if defined(NFAITH) && 0 < NFAITH
|
|
if (faithprefix(&ip6->ip6_dst)) {
|
|
/*
|
|
* Deliver very specific ICMP6 type only.
|
|
* This is important to deilver TOOBIG. Otherwise PMTUD
|
|
* will not work.
|
|
*/
|
|
switch (icmp6->icmp6_type) {
|
|
case ICMP6_DST_UNREACH:
|
|
case ICMP6_PACKET_TOO_BIG:
|
|
case ICMP6_TIME_EXCEEDED:
|
|
break;
|
|
default:
|
|
goto freeit;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
|
|
|
|
switch (icmp6->icmp6_type) {
|
|
case ICMP6_DST_UNREACH:
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
|
|
switch (code) {
|
|
case ICMP6_DST_UNREACH_NOROUTE:
|
|
code = PRC_UNREACH_NET;
|
|
break;
|
|
case ICMP6_DST_UNREACH_ADMIN:
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
|
|
code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
|
|
break;
|
|
case ICMP6_DST_UNREACH_ADDR:
|
|
code = PRC_HOSTDEAD;
|
|
break;
|
|
#ifdef COMPAT_RFC1885
|
|
case ICMP6_DST_UNREACH_NOTNEIGHBOR:
|
|
code = PRC_UNREACH_SRCFAIL;
|
|
break;
|
|
#else
|
|
case ICMP6_DST_UNREACH_BEYONDSCOPE:
|
|
/* I mean "source address was incorrect." */
|
|
code = PRC_UNREACH_NET;
|
|
break;
|
|
#endif
|
|
case ICMP6_DST_UNREACH_NOPORT:
|
|
code = PRC_UNREACH_PORT;
|
|
break;
|
|
default:
|
|
goto badcode;
|
|
}
|
|
goto deliver;
|
|
|
|
case ICMP6_PACKET_TOO_BIG:
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
|
|
if (code != 0)
|
|
goto badcode;
|
|
|
|
code = PRC_MSGSIZE;
|
|
|
|
/*
|
|
* Updating the path MTU will be done after examining
|
|
* intermediate extension headers.
|
|
*/
|
|
goto deliver;
|
|
|
|
case ICMP6_TIME_EXCEEDED:
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
|
|
switch (code) {
|
|
case ICMP6_TIME_EXCEED_TRANSIT:
|
|
code = PRC_TIMXCEED_INTRANS;
|
|
break;
|
|
case ICMP6_TIME_EXCEED_REASSEMBLY:
|
|
code = PRC_TIMXCEED_REASS;
|
|
break;
|
|
default:
|
|
goto badcode;
|
|
}
|
|
goto deliver;
|
|
|
|
case ICMP6_PARAM_PROB:
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
|
|
switch (code) {
|
|
case ICMP6_PARAMPROB_NEXTHEADER:
|
|
code = PRC_UNREACH_PROTOCOL;
|
|
break;
|
|
case ICMP6_PARAMPROB_HEADER:
|
|
case ICMP6_PARAMPROB_OPTION:
|
|
code = PRC_PARAMPROB;
|
|
break;
|
|
default:
|
|
goto badcode;
|
|
}
|
|
goto deliver;
|
|
|
|
case ICMP6_ECHO_REQUEST:
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
|
|
if (code != 0)
|
|
goto badcode;
|
|
/*
|
|
* Copy mbuf to send to two data paths: userland socket(s),
|
|
* and to the querier (echo reply).
|
|
* m: a copy for socket, n: a copy for querier
|
|
*/
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
|
/* Give up local */
|
|
n = m;
|
|
m = NULL;
|
|
goto deliverecho;
|
|
}
|
|
/*
|
|
* If the first mbuf is shared, or the first mbuf is too short,
|
|
* copy the first part of the data into a fresh mbuf.
|
|
* Otherwise, we will wrongly overwrite both copies.
|
|
*/
|
|
if ((n->m_flags & M_EXT) != 0 ||
|
|
n->m_len < off + sizeof(struct icmp6_hdr)) {
|
|
struct mbuf *n0 = n;
|
|
const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
|
|
|
|
/*
|
|
* Prepare an internal mbuf. m_pullup() doesn't
|
|
* always copy the length we specified.
|
|
*/
|
|
if (maxlen >= MCLBYTES) {
|
|
/* Give up remote */
|
|
m_freem(n0);
|
|
break;
|
|
}
|
|
MGETHDR(n, M_DONTWAIT, n0->m_type);
|
|
if (n && maxlen >= MHLEN) {
|
|
MCLGET(n, M_DONTWAIT);
|
|
if ((n->m_flags & M_EXT) == 0) {
|
|
m_free(n);
|
|
n = NULL;
|
|
}
|
|
}
|
|
if (n == NULL) {
|
|
/* Give up local */
|
|
m_freem(n0);
|
|
n = m;
|
|
m = NULL;
|
|
goto deliverecho;
|
|
}
|
|
M_COPY_PKTHDR(n, n0);
|
|
/*
|
|
* Copy IPv6 and ICMPv6 only.
|
|
*/
|
|
nip6 = mtod(n, struct ip6_hdr *);
|
|
bcopy(ip6, nip6, sizeof(struct ip6_hdr));
|
|
nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
|
|
bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
|
|
noff = sizeof(struct ip6_hdr);
|
|
n->m_len = noff + sizeof(struct icmp6_hdr);
|
|
/*
|
|
* Adjust mbuf. ip6_plen will be adjusted in
|
|
* ip6_output().
|
|
* n->m_pkthdr.len == n0->m_pkthdr.len at this point.
|
|
*/
|
|
n->m_pkthdr.len += noff + sizeof(struct icmp6_hdr);
|
|
n->m_pkthdr.len -= (off + sizeof(struct icmp6_hdr));
|
|
m_adj(n0, off + sizeof(struct icmp6_hdr));
|
|
n->m_next = n0;
|
|
n0->m_flags &= ~M_PKTHDR;
|
|
} else {
|
|
deliverecho:
|
|
nip6 = mtod(n, struct ip6_hdr *);
|
|
nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
|
|
noff = off;
|
|
}
|
|
nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
|
|
nicmp6->icmp6_code = 0;
|
|
if (n) {
|
|
icmp6stat.icp6s_reflect++;
|
|
icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
|
|
icmp6_reflect(n, noff);
|
|
}
|
|
if (!m)
|
|
goto freeit;
|
|
break;
|
|
|
|
case ICMP6_ECHO_REPLY:
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
|
|
if (code != 0)
|
|
goto badcode;
|
|
break;
|
|
|
|
case MLD_LISTENER_QUERY:
|
|
case MLD_LISTENER_REPORT:
|
|
if (icmp6len < sizeof(struct mld_hdr))
|
|
goto badlen;
|
|
if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
|
|
else
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
|
/* give up local */
|
|
mld6_input(m, off);
|
|
m = NULL;
|
|
goto freeit;
|
|
}
|
|
mld6_input(n, off);
|
|
/* m stays. */
|
|
break;
|
|
|
|
case MLD_LISTENER_DONE:
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
|
|
if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
|
|
goto badlen;
|
|
break; /* nothing to be done in kernel */
|
|
|
|
case MLD_MTRACE_RESP:
|
|
case MLD_MTRACE:
|
|
/* XXX: these two are experimental. not officially defined. */
|
|
/* XXX: per-interface statistics? */
|
|
break; /* just pass it to applications */
|
|
|
|
case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
|
|
{
|
|
enum { WRU, FQDN } mode;
|
|
|
|
if (!icmp6_nodeinfo)
|
|
break;
|
|
|
|
if (icmp6len == sizeof(struct icmp6_hdr) + 4)
|
|
mode = WRU;
|
|
else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
|
|
mode = FQDN;
|
|
else
|
|
goto badlen;
|
|
|
|
if (mode == FQDN) {
|
|
n = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
|
|
if (n)
|
|
n = ni6_input(n, off);
|
|
/* XXX meaningless if n == NULL */
|
|
noff = sizeof(struct ip6_hdr);
|
|
} else {
|
|
u_char *p;
|
|
int maxlen, maxhlen;
|
|
|
|
if ((icmp6_nodeinfo & 5) != 5)
|
|
break;
|
|
|
|
if (code != 0)
|
|
goto badcode;
|
|
maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
|
|
if (maxlen >= MCLBYTES) {
|
|
/* Give up remote */
|
|
break;
|
|
}
|
|
MGETHDR(n, M_DONTWAIT, m->m_type);
|
|
if (n && maxlen > MHLEN) {
|
|
MCLGET(n, M_DONTWAIT);
|
|
if ((n->m_flags & M_EXT) == 0) {
|
|
m_free(n);
|
|
n = NULL;
|
|
}
|
|
}
|
|
if (n == NULL) {
|
|
/* Give up remote */
|
|
break;
|
|
}
|
|
n->m_pkthdr.rcvif = NULL;
|
|
n->m_len = 0;
|
|
maxhlen = M_TRAILINGSPACE(n) - maxlen;
|
|
if (maxhlen > hostnamelen)
|
|
maxhlen = hostnamelen;
|
|
/*
|
|
* Copy IPv6 and ICMPv6 only.
|
|
*/
|
|
nip6 = mtod(n, struct ip6_hdr *);
|
|
bcopy(ip6, nip6, sizeof(struct ip6_hdr));
|
|
nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
|
|
bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
|
|
p = (u_char *)(nicmp6 + 1);
|
|
bzero(p, 4);
|
|
bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
|
|
noff = sizeof(struct ip6_hdr);
|
|
M_COPY_PKTHDR(n, m); /* just for rcvif */
|
|
n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
|
|
sizeof(struct icmp6_hdr) + 4 + maxhlen;
|
|
nicmp6->icmp6_type = ICMP6_WRUREPLY;
|
|
nicmp6->icmp6_code = 0;
|
|
}
|
|
#undef hostnamelen
|
|
if (n) {
|
|
icmp6stat.icp6s_reflect++;
|
|
icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
|
|
icmp6_reflect(n, noff);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case ICMP6_WRUREPLY:
|
|
if (code != 0)
|
|
goto badcode;
|
|
break;
|
|
|
|
case ND_ROUTER_SOLICIT:
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
|
|
if (code != 0)
|
|
goto badcode;
|
|
if (icmp6len < sizeof(struct nd_router_solicit))
|
|
goto badlen;
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
|
/* give up local */
|
|
nd6_rs_input(m, off, icmp6len);
|
|
m = NULL;
|
|
goto freeit;
|
|
}
|
|
nd6_rs_input(n, off, icmp6len);
|
|
/* m stays. */
|
|
break;
|
|
|
|
case ND_ROUTER_ADVERT:
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
|
|
if (code != 0)
|
|
goto badcode;
|
|
if (icmp6len < sizeof(struct nd_router_advert))
|
|
goto badlen;
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
|
/* give up local */
|
|
nd6_ra_input(m, off, icmp6len);
|
|
m = NULL;
|
|
goto freeit;
|
|
}
|
|
nd6_ra_input(n, off, icmp6len);
|
|
/* m stays. */
|
|
break;
|
|
|
|
case ND_NEIGHBOR_SOLICIT:
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
|
|
if (code != 0)
|
|
goto badcode;
|
|
if (icmp6len < sizeof(struct nd_neighbor_solicit))
|
|
goto badlen;
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
|
/* give up local */
|
|
nd6_ns_input(m, off, icmp6len);
|
|
m = NULL;
|
|
goto freeit;
|
|
}
|
|
nd6_ns_input(n, off, icmp6len);
|
|
/* m stays. */
|
|
break;
|
|
|
|
case ND_NEIGHBOR_ADVERT:
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
|
|
if (code != 0)
|
|
goto badcode;
|
|
if (icmp6len < sizeof(struct nd_neighbor_advert))
|
|
goto badlen;
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
|
/* give up local */
|
|
nd6_na_input(m, off, icmp6len);
|
|
m = NULL;
|
|
goto freeit;
|
|
}
|
|
nd6_na_input(n, off, icmp6len);
|
|
/* m stays. */
|
|
break;
|
|
|
|
case ND_REDIRECT:
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
|
|
if (code != 0)
|
|
goto badcode;
|
|
if (icmp6len < sizeof(struct nd_redirect))
|
|
goto badlen;
|
|
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
|
/* give up local */
|
|
icmp6_redirect_input(m, off);
|
|
m = NULL;
|
|
goto freeit;
|
|
}
|
|
icmp6_redirect_input(n, off);
|
|
/* m stays. */
|
|
break;
|
|
|
|
case ICMP6_ROUTER_RENUMBERING:
|
|
if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
|
|
code != ICMP6_ROUTER_RENUMBERING_RESULT)
|
|
goto badcode;
|
|
if (icmp6len < sizeof(struct icmp6_router_renum))
|
|
goto badlen;
|
|
break;
|
|
|
|
default:
|
|
nd6log((LOG_DEBUG,
|
|
"icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
|
|
icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
|
|
ip6_sprintf(&ip6->ip6_dst),
|
|
m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
|
|
if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
|
|
/* ICMPv6 error: MUST deliver it by spec... */
|
|
code = PRC_NCMDS;
|
|
/* deliver */
|
|
} else {
|
|
/* ICMPv6 informational: MUST not deliver */
|
|
break;
|
|
}
|
|
deliver:
|
|
if (icmp6_notify_error(m, off, icmp6len, code)) {
|
|
/* In this case, m should've been freed. */
|
|
return (IPPROTO_DONE);
|
|
}
|
|
break;
|
|
|
|
badcode:
|
|
icmp6stat.icp6s_badcode++;
|
|
break;
|
|
|
|
badlen:
|
|
icmp6stat.icp6s_badlen++;
|
|
break;
|
|
}
|
|
|
|
/* deliver the packet to appropriate sockets */
|
|
icmp6_rip6_input(&m, *offp);
|
|
|
|
return IPPROTO_DONE;
|
|
|
|
freeit:
|
|
m_freem(m);
|
|
return IPPROTO_DONE;
|
|
}
|
|
|
|
static int
|
|
icmp6_notify_error(m, off, icmp6len, code)
|
|
struct mbuf *m;
|
|
int off, icmp6len;
|
|
{
|
|
struct icmp6_hdr *icmp6;
|
|
struct ip6_hdr *eip6;
|
|
u_int32_t notifymtu;
|
|
struct sockaddr_in6 icmp6src, icmp6dst;
|
|
|
|
if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
|
|
icmp6stat.icp6s_tooshort++;
|
|
goto freeit;
|
|
}
|
|
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
|
|
sizeof(*icmp6) + sizeof(struct ip6_hdr));
|
|
if (icmp6 == NULL) {
|
|
icmp6stat.icp6s_tooshort++;
|
|
return (-1);
|
|
}
|
|
eip6 = (struct ip6_hdr *)(icmp6 + 1);
|
|
|
|
/* Detect the upper level protocol */
|
|
{
|
|
void (*ctlfunc) __P((int, struct sockaddr *, void *));
|
|
u_int8_t nxt = eip6->ip6_nxt;
|
|
int eoff = off + sizeof(struct icmp6_hdr) +
|
|
sizeof(struct ip6_hdr);
|
|
struct ip6ctlparam ip6cp;
|
|
struct in6_addr *finaldst = NULL;
|
|
int icmp6type = icmp6->icmp6_type;
|
|
struct ip6_frag *fh;
|
|
struct ip6_rthdr *rth;
|
|
struct ip6_rthdr0 *rth0;
|
|
int rthlen;
|
|
|
|
while (1) { /* XXX: should avoid infinite loop explicitly? */
|
|
struct ip6_ext *eh;
|
|
|
|
switch (nxt) {
|
|
case IPPROTO_HOPOPTS:
|
|
case IPPROTO_DSTOPTS:
|
|
case IPPROTO_AH:
|
|
IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
|
|
eoff, sizeof(*eh));
|
|
if (eh == NULL) {
|
|
icmp6stat.icp6s_tooshort++;
|
|
return (-1);
|
|
}
|
|
|
|
if (nxt == IPPROTO_AH)
|
|
eoff += (eh->ip6e_len + 2) << 2;
|
|
else
|
|
eoff += (eh->ip6e_len + 1) << 3;
|
|
nxt = eh->ip6e_nxt;
|
|
break;
|
|
case IPPROTO_ROUTING:
|
|
/*
|
|
* When the erroneous packet contains a
|
|
* routing header, we should examine the
|
|
* header to determine the final destination.
|
|
* Otherwise, we can't properly update
|
|
* information that depends on the final
|
|
* destination (e.g. path MTU).
|
|
*/
|
|
IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
|
|
eoff, sizeof(*rth));
|
|
if (rth == NULL) {
|
|
icmp6stat.icp6s_tooshort++;
|
|
return (-1);
|
|
}
|
|
rthlen = (rth->ip6r_len + 1) << 3;
|
|
/*
|
|
* XXX: currently there is no
|
|
* officially defined type other
|
|
* than type-0.
|
|
* Note that if the segment left field
|
|
* is 0, all intermediate hops must
|
|
* have been passed.
|
|
*/
|
|
if (rth->ip6r_segleft &&
|
|
rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
|
|
int hops;
|
|
|
|
IP6_EXTHDR_GET(rth0,
|
|
struct ip6_rthdr0 *, m,
|
|
eoff, rthlen);
|
|
if (rth0 == NULL) {
|
|
icmp6stat.icp6s_tooshort++;
|
|
return (-1);
|
|
}
|
|
/* just ignore a bogus header */
|
|
if ((rth0->ip6r0_len % 2) == 0 &&
|
|
(hops = rth0->ip6r0_len/2))
|
|
finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
|
|
}
|
|
eoff += rthlen;
|
|
nxt = rth->ip6r_nxt;
|
|
break;
|
|
case IPPROTO_FRAGMENT:
|
|
IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
|
|
eoff, sizeof(*fh));
|
|
if (fh == NULL) {
|
|
icmp6stat.icp6s_tooshort++;
|
|
return (-1);
|
|
}
|
|
/*
|
|
* Data after a fragment header is meaningless
|
|
* unless it is the first fragment, but
|
|
* we'll go to the notify label for path MTU
|
|
* discovery.
|
|
*/
|
|
if (fh->ip6f_offlg & IP6F_OFF_MASK)
|
|
goto notify;
|
|
|
|
eoff += sizeof(struct ip6_frag);
|
|
nxt = fh->ip6f_nxt;
|
|
break;
|
|
default:
|
|
/*
|
|
* This case includes ESP and the No Next
|
|
* Header. In such cases going to the notify
|
|
* label does not have any meaning
|
|
* (i.e. ctlfunc will be NULL), but we go
|
|
* anyway since we might have to update
|
|
* path MTU information.
|
|
*/
|
|
goto notify;
|
|
}
|
|
}
|
|
notify:
|
|
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
|
|
sizeof(*icmp6) + sizeof(struct ip6_hdr));
|
|
if (icmp6 == NULL) {
|
|
icmp6stat.icp6s_tooshort++;
|
|
return (-1);
|
|
}
|
|
|
|
eip6 = (struct ip6_hdr *)(icmp6 + 1);
|
|
bzero(&icmp6dst, sizeof(icmp6dst));
|
|
icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
|
|
icmp6dst.sin6_family = AF_INET6;
|
|
if (finaldst == NULL)
|
|
icmp6dst.sin6_addr = eip6->ip6_dst;
|
|
else
|
|
icmp6dst.sin6_addr = *finaldst;
|
|
icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
|
|
&icmp6dst.sin6_addr);
|
|
#ifndef SCOPEDROUTING
|
|
if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
|
|
NULL, NULL)) {
|
|
/* should be impossbile */
|
|
nd6log((LOG_DEBUG,
|
|
"icmp6_notify_error: in6_embedscope failed\n"));
|
|
goto freeit;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* retrieve parameters from the inner IPv6 header, and convert
|
|
* them into sockaddr structures.
|
|
*/
|
|
bzero(&icmp6src, sizeof(icmp6src));
|
|
icmp6src.sin6_len = sizeof(struct sockaddr_in6);
|
|
icmp6src.sin6_family = AF_INET6;
|
|
icmp6src.sin6_addr = eip6->ip6_src;
|
|
icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
|
|
&icmp6src.sin6_addr);
|
|
#ifndef SCOPEDROUTING
|
|
if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
|
|
NULL, NULL)) {
|
|
/* should be impossbile */
|
|
nd6log((LOG_DEBUG,
|
|
"icmp6_notify_error: in6_embedscope failed\n"));
|
|
goto freeit;
|
|
}
|
|
#endif
|
|
icmp6src.sin6_flowinfo =
|
|
(eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
|
|
|
|
if (finaldst == NULL)
|
|
finaldst = &eip6->ip6_dst;
|
|
ip6cp.ip6c_m = m;
|
|
ip6cp.ip6c_icmp6 = icmp6;
|
|
ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
|
|
ip6cp.ip6c_off = eoff;
|
|
ip6cp.ip6c_finaldst = finaldst;
|
|
ip6cp.ip6c_src = &icmp6src;
|
|
ip6cp.ip6c_nxt = nxt;
|
|
|
|
if (icmp6type == ICMP6_PACKET_TOO_BIG) {
|
|
notifymtu = ntohl(icmp6->icmp6_mtu);
|
|
ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
|
|
}
|
|
|
|
ctlfunc = (void (*) __P((int, struct sockaddr *, void *)))
|
|
(inet6sw[ip6_protox[nxt]].pr_ctlinput);
|
|
if (ctlfunc) {
|
|
(void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
|
|
&ip6cp);
|
|
}
|
|
}
|
|
return (0);
|
|
|
|
freeit:
|
|
m_freem(m);
|
|
return (-1);
|
|
}
|
|
|
|
void
|
|
icmp6_mtudisc_update(ip6cp, validated)
|
|
struct ip6ctlparam *ip6cp;
|
|
int validated;
|
|
{
|
|
unsigned long rtcount;
|
|
struct icmp6_mtudisc_callback *mc;
|
|
struct in6_addr *dst = ip6cp->ip6c_finaldst;
|
|
struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
|
|
struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
|
|
u_int mtu = ntohl(icmp6->icmp6_mtu);
|
|
struct rtentry *rt = NULL;
|
|
struct sockaddr_in6 sin6;
|
|
|
|
/*
|
|
* allow non-validated cases if memory is plenty, to make traffic
|
|
* from non-connected pcb happy.
|
|
*/
|
|
rtcount = rt_timer_count(icmp6_mtudisc_timeout_q);
|
|
if (validated) {
|
|
if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat)
|
|
return;
|
|
else if (0 <= icmp6_mtudisc_lowat &&
|
|
rtcount > icmp6_mtudisc_lowat) {
|
|
/*
|
|
* XXX nuke a victim, install the new one.
|
|
*/
|
|
}
|
|
} else {
|
|
if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat)
|
|
return;
|
|
}
|
|
|
|
bzero(&sin6, sizeof(sin6));
|
|
sin6.sin6_family = PF_INET6;
|
|
sin6.sin6_len = sizeof(struct sockaddr_in6);
|
|
sin6.sin6_addr = *dst;
|
|
/* XXX normally, this won't happen */
|
|
if (IN6_IS_ADDR_LINKLOCAL(dst)) {
|
|
sin6.sin6_addr.s6_addr16[1] =
|
|
htons(m->m_pkthdr.rcvif->if_index);
|
|
}
|
|
/* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
|
|
rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6);
|
|
|
|
if (rt && (rt->rt_flags & RTF_HOST) &&
|
|
!(rt->rt_rmx.rmx_locks & RTV_MTU) &&
|
|
(rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) {
|
|
if (mtu < IN6_LINKMTU(rt->rt_ifp)) {
|
|
icmp6stat.icp6s_pmtuchg++;
|
|
rt->rt_rmx.rmx_mtu = mtu;
|
|
}
|
|
}
|
|
if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */
|
|
RTFREE(rt);
|
|
}
|
|
|
|
/*
|
|
* Notify protocols that the MTU for this destination
|
|
* has changed.
|
|
*/
|
|
for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL;
|
|
mc = LIST_NEXT(mc, mc_list))
|
|
(*mc->mc_func)(&sin6.sin6_addr);
|
|
}
|
|
|
|
/*
|
|
* Process a Node Information Query packet, based on
|
|
* draft-ietf-ipngwg-icmp-name-lookups-07.
|
|
*
|
|
* Spec incompatibilities:
|
|
* - IPv6 Subject address handling
|
|
* - IPv4 Subject address handling support missing
|
|
* - Proxy reply (answer even if it's not for me)
|
|
* - joins NI group address at in6_ifattach() time only, does not cope
|
|
* with hostname changes by sethostname(3)
|
|
*/
|
|
#ifndef offsetof /* XXX */
|
|
#define offsetof(type, member) ((size_t)(&((type *)0)->member))
|
|
#endif
|
|
static struct mbuf *
|
|
ni6_input(m, off)
|
|
struct mbuf *m;
|
|
int off;
|
|
{
|
|
struct icmp6_nodeinfo *ni6, *nni6;
|
|
struct mbuf *n = NULL;
|
|
u_int16_t qtype;
|
|
int subjlen;
|
|
int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
|
|
struct ni_reply_fqdn *fqdn;
|
|
int addrs; /* for NI_QTYPE_NODEADDR */
|
|
struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
|
|
struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
|
|
struct ip6_hdr *ip6;
|
|
int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
|
|
char *subj = NULL;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
|
|
if (ni6 == NULL) {
|
|
/* m is already reclaimed */
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Validate IPv6 destination address.
|
|
*
|
|
* The Responder must discard the Query without further processing
|
|
* unless it is one of the Responder's unicast or anycast addresses, or
|
|
* a link-local scope multicast address which the Responder has joined.
|
|
* [icmp-name-lookups-07, Section 4.]
|
|
*/
|
|
bzero(&sin6, sizeof(sin6));
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_len = sizeof(struct sockaddr_in6);
|
|
bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
|
|
/* XXX scopeid */
|
|
if (ifa_ifwithaddr((struct sockaddr *)&sin6))
|
|
; /* unicast/anycast, fine */
|
|
else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
|
|
; /* link-local multicast, fine */
|
|
else
|
|
goto bad;
|
|
|
|
/* validate query Subject field. */
|
|
qtype = ntohs(ni6->ni_qtype);
|
|
subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
|
|
switch (qtype) {
|
|
case NI_QTYPE_NOOP:
|
|
case NI_QTYPE_SUPTYPES:
|
|
/* 07 draft */
|
|
if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
|
|
break;
|
|
/* FALLTHROUGH */
|
|
case NI_QTYPE_FQDN:
|
|
case NI_QTYPE_NODEADDR:
|
|
switch (ni6->ni_code) {
|
|
case ICMP6_NI_SUBJ_IPV6:
|
|
#if ICMP6_NI_SUBJ_IPV6 != 0
|
|
case 0:
|
|
#endif
|
|
/*
|
|
* backward compatibility - try to accept 03 draft
|
|
* format, where no Subject is present.
|
|
*/
|
|
if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
|
|
subjlen == 0) {
|
|
oldfqdn++;
|
|
break;
|
|
}
|
|
#if ICMP6_NI_SUBJ_IPV6 != 0
|
|
if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
|
|
goto bad;
|
|
#endif
|
|
|
|
if (subjlen != sizeof(sin6.sin6_addr))
|
|
goto bad;
|
|
|
|
/*
|
|
* Validate Subject address.
|
|
*
|
|
* Not sure what exactly "address belongs to the node"
|
|
* means in the spec, is it just unicast, or what?
|
|
*
|
|
* At this moment we consider Subject address as
|
|
* "belong to the node" if the Subject address equals
|
|
* to the IPv6 destination address; validation for
|
|
* IPv6 destination address should have done enough
|
|
* check for us.
|
|
*
|
|
* We do not do proxy at this moment.
|
|
*/
|
|
/* m_pulldown instead of copy? */
|
|
m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
|
|
subjlen, (caddr_t)&sin6.sin6_addr);
|
|
/* XXX kame scope hack */
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) {
|
|
if ((m->m_flags & M_PKTHDR) != 0 &&
|
|
m->m_pkthdr.rcvif) {
|
|
sin6.sin6_addr.s6_addr16[1] =
|
|
htons(m->m_pkthdr.rcvif->if_index);
|
|
}
|
|
}
|
|
subj = (char *)&sin6;
|
|
if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6.sin6_addr))
|
|
break;
|
|
|
|
/*
|
|
* XXX if we are to allow other cases, we should really
|
|
* be careful about scope here.
|
|
* basically, we should disallow queries toward IPv6
|
|
* destination X with subject Y, if scope(X) > scope(Y).
|
|
* if we allow scope(X) > scope(Y), it will result in
|
|
* information leakage across scope boundary.
|
|
*/
|
|
goto bad;
|
|
|
|
case ICMP6_NI_SUBJ_FQDN:
|
|
/*
|
|
* Validate Subject name with gethostname(3).
|
|
*
|
|
* The behavior may need some debate, since:
|
|
* - we are not sure if the node has FQDN as
|
|
* hostname (returned by gethostname(3)).
|
|
* - the code does wildcard match for truncated names.
|
|
* however, we are not sure if we want to perform
|
|
* wildcard match, if gethostname(3) side has
|
|
* truncated hostname.
|
|
*/
|
|
n = ni6_nametodns(hostname, hostnamelen, 0);
|
|
if (!n || n->m_next || n->m_len == 0)
|
|
goto bad;
|
|
IP6_EXTHDR_GET(subj, char *, m,
|
|
off + sizeof(struct icmp6_nodeinfo), subjlen);
|
|
if (subj == NULL)
|
|
goto bad;
|
|
if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
|
|
n->m_len)) {
|
|
goto bad;
|
|
}
|
|
m_freem(n);
|
|
n = NULL;
|
|
break;
|
|
|
|
case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
|
|
default:
|
|
goto bad;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
|
|
switch (qtype) {
|
|
case NI_QTYPE_FQDN:
|
|
if ((icmp6_nodeinfo & 1) == 0)
|
|
goto bad;
|
|
break;
|
|
case NI_QTYPE_NODEADDR:
|
|
if ((icmp6_nodeinfo & 2) == 0)
|
|
goto bad;
|
|
break;
|
|
}
|
|
|
|
/* guess reply length */
|
|
switch (qtype) {
|
|
case NI_QTYPE_NOOP:
|
|
break; /* no reply data */
|
|
case NI_QTYPE_SUPTYPES:
|
|
replylen += sizeof(u_int32_t);
|
|
break;
|
|
case NI_QTYPE_FQDN:
|
|
/* XXX will append an mbuf */
|
|
replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
|
|
break;
|
|
case NI_QTYPE_NODEADDR:
|
|
addrs = ni6_addrs(ni6, m, &ifp, subj);
|
|
if ((replylen += addrs * (sizeof(struct in6_addr) +
|
|
sizeof(u_int32_t))) > MCLBYTES)
|
|
replylen = MCLBYTES; /* XXX: will truncate pkt later */
|
|
break;
|
|
default:
|
|
/*
|
|
* XXX: We must return a reply with the ICMP6 code
|
|
* `unknown Qtype' in this case. However we regard the case
|
|
* as an FQDN query for backward compatibility.
|
|
* Older versions set a random value to this field,
|
|
* so it rarely varies in the defined qtypes.
|
|
* But the mechanism is not reliable...
|
|
* maybe we should obsolete older versions.
|
|
*/
|
|
qtype = NI_QTYPE_FQDN;
|
|
/* XXX will append an mbuf */
|
|
replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
|
|
oldfqdn++;
|
|
break;
|
|
}
|
|
|
|
/* allocate an mbuf to reply. */
|
|
MGETHDR(n, M_DONTWAIT, m->m_type);
|
|
if (n == NULL) {
|
|
m_freem(m);
|
|
return (NULL);
|
|
}
|
|
M_COPY_PKTHDR(n, m); /* just for rcvif */
|
|
if (replylen > MHLEN) {
|
|
if (replylen > MCLBYTES) {
|
|
/*
|
|
* XXX: should we try to allocate more? But MCLBYTES
|
|
* is probably much larger than IPV6_MMTU...
|
|
*/
|
|
goto bad;
|
|
}
|
|
MCLGET(n, M_DONTWAIT);
|
|
if ((n->m_flags & M_EXT) == 0) {
|
|
goto bad;
|
|
}
|
|
}
|
|
n->m_pkthdr.len = n->m_len = replylen;
|
|
|
|
/* copy mbuf header and IPv6 + Node Information base headers */
|
|
bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
|
|
nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
|
|
bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
|
|
|
|
/* qtype dependent procedure */
|
|
switch (qtype) {
|
|
case NI_QTYPE_NOOP:
|
|
nni6->ni_code = ICMP6_NI_SUCCESS;
|
|
nni6->ni_flags = 0;
|
|
break;
|
|
case NI_QTYPE_SUPTYPES:
|
|
{
|
|
u_int32_t v;
|
|
nni6->ni_code = ICMP6_NI_SUCCESS;
|
|
nni6->ni_flags = htons(0x0000); /* raw bitmap */
|
|
/* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
|
|
v = (u_int32_t)htonl(0x0000000f);
|
|
bcopy(&v, nni6 + 1, sizeof(u_int32_t));
|
|
break;
|
|
}
|
|
case NI_QTYPE_FQDN:
|
|
nni6->ni_code = ICMP6_NI_SUCCESS;
|
|
fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
|
|
sizeof(struct ip6_hdr) +
|
|
sizeof(struct icmp6_nodeinfo));
|
|
nni6->ni_flags = 0; /* XXX: meaningless TTL */
|
|
fqdn->ni_fqdn_ttl = 0; /* ditto. */
|
|
/*
|
|
* XXX do we really have FQDN in variable "hostname"?
|
|
*/
|
|
n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
|
|
if (n->m_next == NULL)
|
|
goto bad;
|
|
/* XXX we assume that n->m_next is not a chain */
|
|
if (n->m_next->m_next != NULL)
|
|
goto bad;
|
|
n->m_pkthdr.len += n->m_next->m_len;
|
|
break;
|
|
case NI_QTYPE_NODEADDR:
|
|
{
|
|
int lenlim, copied;
|
|
|
|
nni6->ni_code = ICMP6_NI_SUCCESS;
|
|
n->m_pkthdr.len = n->m_len =
|
|
sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
|
|
lenlim = M_TRAILINGSPACE(n);
|
|
copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
|
|
/* XXX: reset mbuf length */
|
|
n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
|
|
sizeof(struct icmp6_nodeinfo) + copied;
|
|
break;
|
|
}
|
|
default:
|
|
break; /* XXX impossible! */
|
|
}
|
|
|
|
nni6->ni_type = ICMP6_NI_REPLY;
|
|
m_freem(m);
|
|
return (n);
|
|
|
|
bad:
|
|
m_freem(m);
|
|
if (n)
|
|
m_freem(n);
|
|
return (NULL);
|
|
}
|
|
#undef hostnamelen
|
|
|
|
#define isupper(x) ('A' <= (x) && (x) <= 'Z')
|
|
#define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z'))
|
|
#define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9'))
|
|
#define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x))
|
|
|
|
/*
|
|
* make a mbuf with DNS-encoded string. no compression support.
|
|
*
|
|
* XXX names with less than 2 dots (like "foo" or "foo.section") will be
|
|
* treated as truncated name (two \0 at the end). this is a wild guess.
|
|
*/
|
|
static struct mbuf *
|
|
ni6_nametodns(name, namelen, old)
|
|
const char *name;
|
|
int namelen;
|
|
int old; /* return pascal string if non-zero */
|
|
{
|
|
struct mbuf *m;
|
|
char *cp, *ep;
|
|
const char *p, *q;
|
|
int i, len, nterm;
|
|
|
|
if (old)
|
|
len = namelen + 1;
|
|
else
|
|
len = MCLBYTES;
|
|
|
|
/* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
|
|
MGET(m, M_DONTWAIT, MT_DATA);
|
|
if (m && len > MLEN) {
|
|
MCLGET(m, M_DONTWAIT);
|
|
if ((m->m_flags & M_EXT) == 0)
|
|
goto fail;
|
|
}
|
|
if (!m)
|
|
goto fail;
|
|
m->m_next = NULL;
|
|
|
|
if (old) {
|
|
m->m_len = len;
|
|
*mtod(m, char *) = namelen;
|
|
bcopy(name, mtod(m, char *) + 1, namelen);
|
|
return m;
|
|
} else {
|
|
m->m_len = 0;
|
|
cp = mtod(m, char *);
|
|
ep = mtod(m, char *) + M_TRAILINGSPACE(m);
|
|
|
|
/* if not certain about my name, return empty buffer */
|
|
if (namelen == 0)
|
|
return m;
|
|
|
|
/*
|
|
* guess if it looks like shortened hostname, or FQDN.
|
|
* shortened hostname needs two trailing "\0".
|
|
*/
|
|
i = 0;
|
|
for (p = name; p < name + namelen; p++) {
|
|
if (*p && *p == '.')
|
|
i++;
|
|
}
|
|
if (i < 2)
|
|
nterm = 2;
|
|
else
|
|
nterm = 1;
|
|
|
|
p = name;
|
|
while (cp < ep && p < name + namelen) {
|
|
i = 0;
|
|
for (q = p; q < name + namelen && *q && *q != '.'; q++)
|
|
i++;
|
|
/* result does not fit into mbuf */
|
|
if (cp + i + 1 >= ep)
|
|
goto fail;
|
|
/*
|
|
* DNS label length restriction, RFC1035 page 8.
|
|
* "i == 0" case is included here to avoid returning
|
|
* 0-length label on "foo..bar".
|
|
*/
|
|
if (i <= 0 || i >= 64)
|
|
goto fail;
|
|
*cp++ = i;
|
|
if (!isalpha(p[0]) || !isalnum(p[i - 1]))
|
|
goto fail;
|
|
while (i > 0) {
|
|
if (!isalnum(*p) && *p != '-')
|
|
goto fail;
|
|
if (isupper(*p)) {
|
|
*cp++ = tolower(*p);
|
|
p++;
|
|
} else
|
|
*cp++ = *p++;
|
|
i--;
|
|
}
|
|
p = q;
|
|
if (p < name + namelen && *p == '.')
|
|
p++;
|
|
}
|
|
/* termination */
|
|
if (cp + nterm >= ep)
|
|
goto fail;
|
|
while (nterm-- > 0)
|
|
*cp++ = '\0';
|
|
m->m_len = cp - mtod(m, char *);
|
|
return m;
|
|
}
|
|
|
|
panic("should not reach here");
|
|
/* NOTREACHED */
|
|
|
|
fail:
|
|
if (m)
|
|
m_freem(m);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* check if two DNS-encoded string matches. takes care of truncated
|
|
* form (with \0\0 at the end). no compression support.
|
|
* XXX upper/lowercase match (see RFC2065)
|
|
*/
|
|
static int
|
|
ni6_dnsmatch(a, alen, b, blen)
|
|
const char *a;
|
|
int alen;
|
|
const char *b;
|
|
int blen;
|
|
{
|
|
const char *a0, *b0;
|
|
int l;
|
|
|
|
/* simplest case - need validation? */
|
|
if (alen == blen && bcmp(a, b, alen) == 0)
|
|
return 1;
|
|
|
|
a0 = a;
|
|
b0 = b;
|
|
|
|
/* termination is mandatory */
|
|
if (alen < 2 || blen < 2)
|
|
return 0;
|
|
if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
|
|
return 0;
|
|
alen--;
|
|
blen--;
|
|
|
|
while (a - a0 < alen && b - b0 < blen) {
|
|
if (a - a0 + 1 > alen || b - b0 + 1 > blen)
|
|
return 0;
|
|
|
|
if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
|
|
return 0;
|
|
/* we don't support compression yet */
|
|
if (a[0] >= 64 || b[0] >= 64)
|
|
return 0;
|
|
|
|
/* truncated case */
|
|
if (a[0] == 0 && a - a0 == alen - 1)
|
|
return 1;
|
|
if (b[0] == 0 && b - b0 == blen - 1)
|
|
return 1;
|
|
if (a[0] == 0 || b[0] == 0)
|
|
return 0;
|
|
|
|
if (a[0] != b[0])
|
|
return 0;
|
|
l = a[0];
|
|
if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
|
|
return 0;
|
|
if (bcmp(a + 1, b + 1, l) != 0)
|
|
return 0;
|
|
|
|
a += 1 + l;
|
|
b += 1 + l;
|
|
}
|
|
|
|
if (a - a0 == alen && b - b0 == blen)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* calculate the number of addresses to be returned in the node info reply.
|
|
*/
|
|
static int
|
|
ni6_addrs(ni6, m, ifpp, subj)
|
|
struct icmp6_nodeinfo *ni6;
|
|
struct mbuf *m;
|
|
struct ifnet **ifpp;
|
|
char *subj;
|
|
{
|
|
struct ifnet *ifp;
|
|
struct in6_ifaddr *ifa6;
|
|
struct ifaddr *ifa;
|
|
struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
|
|
int addrs = 0, addrsofif, iffound = 0;
|
|
int niflags = ni6->ni_flags;
|
|
|
|
if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
|
|
switch (ni6->ni_code) {
|
|
case ICMP6_NI_SUBJ_IPV6:
|
|
if (subj == NULL) /* must be impossible... */
|
|
return (0);
|
|
subj_ip6 = (struct sockaddr_in6 *)subj;
|
|
break;
|
|
default:
|
|
/*
|
|
* XXX: we only support IPv6 subject address for
|
|
* this Qtype.
|
|
*/
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
|
|
{
|
|
addrsofif = 0;
|
|
for (ifa = ifp->if_addrlist.tqh_first; ifa;
|
|
ifa = ifa->ifa_list.tqe_next)
|
|
{
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
continue;
|
|
ifa6 = (struct in6_ifaddr *)ifa;
|
|
|
|
if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
|
|
IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
|
|
&ifa6->ia_addr.sin6_addr))
|
|
iffound = 1;
|
|
|
|
/*
|
|
* IPv4-mapped addresses can only be returned by a
|
|
* Node Information proxy, since they represent
|
|
* addresses of IPv4-only nodes, which perforce do
|
|
* not implement this protocol.
|
|
* [icmp-name-lookups-07, Section 5.4]
|
|
* So we don't support NI_NODEADDR_FLAG_COMPAT in
|
|
* this function at this moment.
|
|
*/
|
|
|
|
/* What do we have to do about ::1? */
|
|
switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
|
|
case IPV6_ADDR_SCOPE_LINKLOCAL:
|
|
if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
|
|
continue;
|
|
break;
|
|
case IPV6_ADDR_SCOPE_SITELOCAL:
|
|
if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
|
|
continue;
|
|
break;
|
|
case IPV6_ADDR_SCOPE_GLOBAL:
|
|
if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
|
|
continue;
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* check if anycast is okay.
|
|
* XXX: just experimental. not in the spec.
|
|
*/
|
|
if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
|
|
(niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
|
|
continue; /* we need only unicast addresses */
|
|
|
|
addrsofif++; /* count the address */
|
|
}
|
|
if (iffound) {
|
|
*ifpp = ifp;
|
|
return (addrsofif);
|
|
}
|
|
|
|
addrs += addrsofif;
|
|
}
|
|
|
|
return (addrs);
|
|
}
|
|
|
|
static int
|
|
ni6_store_addrs(ni6, nni6, ifp0, resid)
|
|
struct icmp6_nodeinfo *ni6, *nni6;
|
|
struct ifnet *ifp0;
|
|
int resid;
|
|
{
|
|
struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
|
|
struct in6_ifaddr *ifa6;
|
|
struct ifaddr *ifa;
|
|
struct ifnet *ifp_dep = NULL;
|
|
int copied = 0, allow_deprecated = 0;
|
|
u_char *cp = (u_char *)(nni6 + 1);
|
|
int niflags = ni6->ni_flags;
|
|
u_int32_t ltime;
|
|
|
|
if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
|
|
return (0); /* needless to copy */
|
|
|
|
again:
|
|
|
|
for (; ifp; ifp = TAILQ_NEXT(ifp, if_list))
|
|
{
|
|
for (ifa = ifp->if_addrlist.tqh_first; ifa;
|
|
ifa = ifa->ifa_list.tqe_next)
|
|
{
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
continue;
|
|
ifa6 = (struct in6_ifaddr *)ifa;
|
|
|
|
if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
|
|
allow_deprecated == 0) {
|
|
/*
|
|
* prefererred address should be put before
|
|
* deprecated addresses.
|
|
*/
|
|
|
|
/* record the interface for later search */
|
|
if (ifp_dep == NULL)
|
|
ifp_dep = ifp;
|
|
|
|
continue;
|
|
}
|
|
else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
|
|
allow_deprecated != 0)
|
|
continue; /* we now collect deprecated addrs */
|
|
|
|
/* What do we have to do about ::1? */
|
|
switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
|
|
case IPV6_ADDR_SCOPE_LINKLOCAL:
|
|
if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
|
|
continue;
|
|
break;
|
|
case IPV6_ADDR_SCOPE_SITELOCAL:
|
|
if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
|
|
continue;
|
|
break;
|
|
case IPV6_ADDR_SCOPE_GLOBAL:
|
|
if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
|
|
continue;
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* check if anycast is okay.
|
|
* XXX: just experimental. not in the spec.
|
|
*/
|
|
if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
|
|
(niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
|
|
continue;
|
|
|
|
/* now we can copy the address */
|
|
if (resid < sizeof(struct in6_addr) +
|
|
sizeof(u_int32_t)) {
|
|
/*
|
|
* We give up much more copy.
|
|
* Set the truncate flag and return.
|
|
*/
|
|
nni6->ni_flags |=
|
|
NI_NODEADDR_FLAG_TRUNCATE;
|
|
return (copied);
|
|
}
|
|
|
|
/*
|
|
* Set the TTL of the address.
|
|
* The TTL value should be one of the following
|
|
* according to the specification:
|
|
*
|
|
* 1. The remaining lifetime of a DHCP lease on the
|
|
* address, or
|
|
* 2. The remaining Valid Lifetime of a prefix from
|
|
* which the address was derived through Stateless
|
|
* Autoconfiguration.
|
|
*
|
|
* Note that we currently do not support stateful
|
|
* address configuration by DHCPv6, so the former
|
|
* case can't happen.
|
|
*
|
|
* TTL must be 2^31 > TTL >= 0.
|
|
*/
|
|
if (ifa6->ia6_lifetime.ia6t_expire == 0)
|
|
ltime = ND6_INFINITE_LIFETIME;
|
|
else {
|
|
if (ifa6->ia6_lifetime.ia6t_expire >
|
|
time.tv_sec)
|
|
ltime = ifa6->ia6_lifetime.ia6t_expire - time.tv_sec;
|
|
else
|
|
ltime = 0;
|
|
}
|
|
if (ltime > 0x7fffffff)
|
|
ltime = 0x7fffffff;
|
|
ltime = htonl(ltime);
|
|
|
|
bcopy(<ime, cp, sizeof(u_int32_t));
|
|
cp += sizeof(u_int32_t);
|
|
|
|
/* copy the address itself */
|
|
bcopy(&ifa6->ia_addr.sin6_addr, cp,
|
|
sizeof(struct in6_addr));
|
|
/* XXX: KAME link-local hack; remove ifindex */
|
|
if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
|
|
((struct in6_addr *)cp)->s6_addr16[1] = 0;
|
|
cp += sizeof(struct in6_addr);
|
|
|
|
resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
|
|
copied += (sizeof(struct in6_addr) +
|
|
sizeof(u_int32_t));
|
|
}
|
|
if (ifp0) /* we need search only on the specified IF */
|
|
break;
|
|
}
|
|
|
|
if (allow_deprecated == 0 && ifp_dep != NULL) {
|
|
ifp = ifp_dep;
|
|
allow_deprecated = 1;
|
|
|
|
goto again;
|
|
}
|
|
|
|
return (copied);
|
|
}
|
|
|
|
/*
|
|
* XXX almost dup'ed code with rip6_input.
|
|
*/
|
|
static int
|
|
icmp6_rip6_input(mp, off)
|
|
struct mbuf **mp;
|
|
int off;
|
|
{
|
|
struct mbuf *m = *mp;
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
|
struct in6pcb *in6p;
|
|
struct in6pcb *last = NULL;
|
|
struct sockaddr_in6 rip6src;
|
|
struct icmp6_hdr *icmp6;
|
|
struct mbuf *opts = NULL;
|
|
|
|
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
|
|
if (icmp6 == NULL) {
|
|
/* m is already reclaimed */
|
|
return IPPROTO_DONE;
|
|
}
|
|
|
|
bzero(&rip6src, sizeof(rip6src));
|
|
rip6src.sin6_len = sizeof(struct sockaddr_in6);
|
|
rip6src.sin6_family = AF_INET6;
|
|
/* KAME hack: recover scopeid */
|
|
(void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
|
|
|
|
for (in6p = rawin6pcb.in6p_next;
|
|
in6p != &rawin6pcb; in6p = in6p->in6p_next)
|
|
{
|
|
if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
|
|
continue;
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
|
|
!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
|
|
continue;
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
|
|
!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
|
|
continue;
|
|
if (in6p->in6p_icmp6filt
|
|
&& ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
|
|
in6p->in6p_icmp6filt))
|
|
continue;
|
|
if (last) {
|
|
struct mbuf *n;
|
|
if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
|
|
if (last->in6p_flags & IN6P_CONTROLOPTS)
|
|
ip6_savecontrol(last, &opts, ip6, n);
|
|
/* strip intermediate headers */
|
|
m_adj(n, off);
|
|
if (sbappendaddr(&last->in6p_socket->so_rcv,
|
|
(struct sockaddr *)&rip6src,
|
|
n, opts) == 0) {
|
|
/* should notify about lost packet */
|
|
m_freem(n);
|
|
if (opts)
|
|
m_freem(opts);
|
|
} else
|
|
sorwakeup(last->in6p_socket);
|
|
opts = NULL;
|
|
}
|
|
}
|
|
last = in6p;
|
|
}
|
|
if (last) {
|
|
if (last->in6p_flags & IN6P_CONTROLOPTS)
|
|
ip6_savecontrol(last, &opts, ip6, m);
|
|
/* strip intermediate headers */
|
|
m_adj(m, off);
|
|
if (sbappendaddr(&last->in6p_socket->so_rcv,
|
|
(struct sockaddr *)&rip6src, m, opts) == 0) {
|
|
m_freem(m);
|
|
if (opts)
|
|
m_freem(opts);
|
|
} else
|
|
sorwakeup(last->in6p_socket);
|
|
} else {
|
|
m_freem(m);
|
|
ip6stat.ip6s_delivered--;
|
|
}
|
|
return IPPROTO_DONE;
|
|
}
|
|
|
|
/*
|
|
* Reflect the ip6 packet back to the source.
|
|
* OFF points to the icmp6 header, counted from the top of the mbuf.
|
|
*
|
|
* Note: RFC 1885 required that an echo reply should be truncated if it
|
|
* did not fit in with (return) path MTU, and KAME code supported the
|
|
* behavior. However, as a clarification after the RFC, this limitation
|
|
* was removed in a revised version of the spec, RFC 2463. We had kept the
|
|
* old behavior, with a (non-default) ifdef block, while the new version of
|
|
* the spec was an internet-draft status, and even after the new RFC was
|
|
* published. But it would rather make sense to clean the obsoleted part
|
|
* up, and to make the code simpler at this stage.
|
|
*/
|
|
void
|
|
icmp6_reflect(m, off)
|
|
struct mbuf *m;
|
|
size_t off;
|
|
{
|
|
struct ip6_hdr *ip6;
|
|
struct icmp6_hdr *icmp6;
|
|
struct in6_ifaddr *ia;
|
|
struct in6_addr t, *src = 0;
|
|
int plen;
|
|
int type, code;
|
|
struct ifnet *outif = NULL;
|
|
struct sockaddr_in6 sa6_src, sa6_dst;
|
|
|
|
/* too short to reflect */
|
|
if (off < sizeof(struct ip6_hdr)) {
|
|
nd6log((LOG_DEBUG,
|
|
"sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
|
|
(u_long)off, (u_long)sizeof(struct ip6_hdr),
|
|
__FILE__, __LINE__));
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* If there are extra headers between IPv6 and ICMPv6, strip
|
|
* off that header first.
|
|
*/
|
|
#ifdef DIAGNOSTIC
|
|
if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
|
|
panic("assumption failed in icmp6_reflect");
|
|
#endif
|
|
if (off > sizeof(struct ip6_hdr)) {
|
|
size_t l;
|
|
struct ip6_hdr nip6;
|
|
|
|
l = off - sizeof(struct ip6_hdr);
|
|
m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
|
|
m_adj(m, l);
|
|
l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
|
|
if (m->m_len < l) {
|
|
if ((m = m_pullup(m, l)) == NULL)
|
|
return;
|
|
}
|
|
bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
|
|
} else /* off == sizeof(struct ip6_hdr) */ {
|
|
size_t l;
|
|
l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
|
|
if (m->m_len < l) {
|
|
if ((m = m_pullup(m, l)) == NULL)
|
|
return;
|
|
}
|
|
}
|
|
plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
icmp6 = (struct icmp6_hdr *)(ip6 + 1);
|
|
type = icmp6->icmp6_type; /* keep type for statistics */
|
|
code = icmp6->icmp6_code; /* ditto. */
|
|
|
|
t = ip6->ip6_dst;
|
|
/*
|
|
* ip6_input() drops a packet if its src is multicast.
|
|
* So, the src is never multicast.
|
|
*/
|
|
ip6->ip6_dst = ip6->ip6_src;
|
|
|
|
/*
|
|
* XXX: make sure to embed scope zone information, using
|
|
* already embedded IDs or the received interface (if any).
|
|
* Note that rcvif may be NULL.
|
|
* TODO: scoped routing case (XXX).
|
|
*/
|
|
bzero(&sa6_src, sizeof(sa6_src));
|
|
sa6_src.sin6_family = AF_INET6;
|
|
sa6_src.sin6_len = sizeof(sa6_src);
|
|
sa6_src.sin6_addr = ip6->ip6_dst;
|
|
in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
|
|
in6_embedscope(&sa6_src.sin6_addr, &sa6_src, NULL, NULL);
|
|
ip6->ip6_dst = sa6_src.sin6_addr;
|
|
|
|
bzero(&sa6_dst, sizeof(sa6_dst));
|
|
sa6_dst.sin6_family = AF_INET6;
|
|
sa6_dst.sin6_len = sizeof(sa6_dst);
|
|
sa6_dst.sin6_addr = t;
|
|
in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
|
|
in6_embedscope(&t, &sa6_dst, NULL, NULL);
|
|
|
|
/*
|
|
* If the incoming packet was addressed directly to us (i.e. unicast),
|
|
* use dst as the src for the reply.
|
|
* The IN6_IFF_NOTREADY case would be VERY rare, but is possible
|
|
* (for example) when we encounter an error while forwarding procedure
|
|
* destined to a duplicated address of ours.
|
|
*/
|
|
for (ia = in6_ifaddr; ia; ia = ia->ia_next)
|
|
if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
|
|
(ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
|
|
src = &t;
|
|
break;
|
|
}
|
|
if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
|
|
/*
|
|
* This is the case if the dst is our link-local address
|
|
* and the sender is also ourselves.
|
|
*/
|
|
src = &t;
|
|
}
|
|
|
|
if (src == 0) {
|
|
int e;
|
|
struct route_in6 ro;
|
|
|
|
/*
|
|
* This case matches to multicasts, our anycast, or unicasts
|
|
* that we do not own. Select a source address based on the
|
|
* source address of the erroneous packet.
|
|
*/
|
|
bzero(&ro, sizeof(ro));
|
|
src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e);
|
|
if (ro.ro_rt) { /* XXX: see comments in icmp6_mtudisc_update */
|
|
RTFREE(ro.ro_rt); /* XXX: we could use this */
|
|
}
|
|
if (src == NULL) {
|
|
nd6log((LOG_DEBUG,
|
|
"icmp6_reflect: source can't be determined: "
|
|
"dst=%s, error=%d\n",
|
|
ip6_sprintf(&sa6_src.sin6_addr), e));
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
ip6->ip6_src = *src;
|
|
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
if (m->m_pkthdr.rcvif) {
|
|
/* XXX: This may not be the outgoing interface */
|
|
ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
|
|
} else
|
|
ip6->ip6_hlim = ip6_defhlim;
|
|
|
|
icmp6->icmp6_cksum = 0;
|
|
icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
|
|
sizeof(struct ip6_hdr), plen);
|
|
|
|
/*
|
|
* XXX option handling
|
|
*/
|
|
|
|
m->m_flags &= ~(M_BCAST|M_MCAST);
|
|
#ifdef IPSEC
|
|
/* Don't lookup socket */
|
|
(void)ipsec_setsocket(m, NULL);
|
|
#endif /* IPSEC */
|
|
|
|
/*
|
|
* To avoid a "too big" situation at an intermediate router
|
|
* and the path MTU discovery process, specify the IPV6_MINMTU flag.
|
|
* Note that only echo and node information replies are affected,
|
|
* since the length of ICMP6 errors is limited to the minimum MTU.
|
|
*/
|
|
if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, &outif) != 0 && outif)
|
|
icmp6_ifstat_inc(outif, ifs6_out_error);
|
|
|
|
if (outif)
|
|
icmp6_ifoutstat_inc(outif, type, code);
|
|
|
|
return;
|
|
|
|
bad:
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
void
|
|
icmp6_fasttimo()
|
|
{
|
|
|
|
mld6_fasttimeo();
|
|
}
|
|
|
|
static const char *
|
|
icmp6_redirect_diag(src6, dst6, tgt6)
|
|
struct in6_addr *src6;
|
|
struct in6_addr *dst6;
|
|
struct in6_addr *tgt6;
|
|
{
|
|
static char buf[1024];
|
|
snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
|
|
ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
|
|
return buf;
|
|
}
|
|
|
|
void
|
|
icmp6_redirect_input(m, off)
|
|
struct mbuf *m;
|
|
int off;
|
|
{
|
|
struct ifnet *ifp = m->m_pkthdr.rcvif;
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
|
struct nd_redirect *nd_rd;
|
|
int icmp6len = ntohs(ip6->ip6_plen);
|
|
char *lladdr = NULL;
|
|
int lladdrlen = 0;
|
|
u_char *redirhdr = NULL;
|
|
int redirhdrlen = 0;
|
|
struct rtentry *rt = NULL;
|
|
int is_router;
|
|
int is_onlink;
|
|
struct in6_addr src6 = ip6->ip6_src;
|
|
struct in6_addr redtgt6;
|
|
struct in6_addr reddst6;
|
|
union nd_opts ndopts;
|
|
|
|
if (!ifp)
|
|
return;
|
|
|
|
/* XXX if we are router, we don't update route by icmp6 redirect */
|
|
if (ip6_forwarding)
|
|
goto freeit;
|
|
if (!icmp6_rediraccept)
|
|
goto freeit;
|
|
|
|
IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
|
|
if (nd_rd == NULL) {
|
|
icmp6stat.icp6s_tooshort++;
|
|
return;
|
|
}
|
|
redtgt6 = nd_rd->nd_rd_target;
|
|
reddst6 = nd_rd->nd_rd_dst;
|
|
|
|
if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
|
|
redtgt6.s6_addr16[1] = htons(ifp->if_index);
|
|
if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
|
|
reddst6.s6_addr16[1] = htons(ifp->if_index);
|
|
|
|
/* validation */
|
|
if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect sent from %s rejected; "
|
|
"must be from linklocal\n", ip6_sprintf(&src6)));
|
|
goto bad;
|
|
}
|
|
if (ip6->ip6_hlim != 255) {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect sent from %s rejected; "
|
|
"hlim=%d (must be 255)\n",
|
|
ip6_sprintf(&src6), ip6->ip6_hlim));
|
|
goto bad;
|
|
}
|
|
{
|
|
/* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
|
|
struct sockaddr_in6 sin6;
|
|
struct in6_addr *gw6;
|
|
|
|
bzero(&sin6, sizeof(sin6));
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_len = sizeof(struct sockaddr_in6);
|
|
bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
|
|
rt = rtalloc1((struct sockaddr *)&sin6, 0);
|
|
if (rt) {
|
|
if (rt->rt_gateway == NULL ||
|
|
rt->rt_gateway->sa_family != AF_INET6) {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect rejected; no route "
|
|
"with inet6 gateway found for redirect dst: %s\n",
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
RTFREE(rt);
|
|
goto bad;
|
|
}
|
|
|
|
gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
|
|
if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect rejected; "
|
|
"not equal to gw-for-src=%s (must be same): "
|
|
"%s\n",
|
|
ip6_sprintf(gw6),
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
RTFREE(rt);
|
|
goto bad;
|
|
}
|
|
} else {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect rejected; "
|
|
"no route found for redirect dst: %s\n",
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
goto bad;
|
|
}
|
|
RTFREE(rt);
|
|
rt = NULL;
|
|
}
|
|
if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect rejected; "
|
|
"redirect dst must be unicast: %s\n",
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
goto bad;
|
|
}
|
|
|
|
is_router = is_onlink = 0;
|
|
if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
|
|
is_router = 1; /* router case */
|
|
if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
|
|
is_onlink = 1; /* on-link destination case */
|
|
if (!is_router && !is_onlink) {
|
|
nd6log((LOG_ERR,
|
|
"ICMP6 redirect rejected; "
|
|
"neither router case nor onlink case: %s\n",
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
goto bad;
|
|
}
|
|
/* validation passed */
|
|
|
|
icmp6len -= sizeof(*nd_rd);
|
|
nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
|
|
if (nd6_options(&ndopts) < 0) {
|
|
nd6log((LOG_INFO, "icmp6_redirect_input: "
|
|
"invalid ND option, rejected: %s\n",
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
/* nd6_options have incremented stats */
|
|
goto freeit;
|
|
}
|
|
|
|
if (ndopts.nd_opts_tgt_lladdr) {
|
|
lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
|
|
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
|
|
}
|
|
|
|
if (ndopts.nd_opts_rh) {
|
|
redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
|
|
redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
|
|
}
|
|
|
|
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
|
|
nd6log((LOG_INFO,
|
|
"icmp6_redirect_input: lladdrlen mismatch for %s "
|
|
"(if %d, icmp6 packet %d): %s\n",
|
|
ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
|
|
icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
|
|
goto bad;
|
|
}
|
|
|
|
/* RFC 2461 8.3 */
|
|
nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
|
|
is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
|
|
|
|
if (!is_onlink) { /* better router case. perform rtredirect. */
|
|
/* perform rtredirect */
|
|
struct sockaddr_in6 sdst;
|
|
struct sockaddr_in6 sgw;
|
|
struct sockaddr_in6 ssrc;
|
|
unsigned long rtcount;
|
|
struct rtentry *newrt = NULL;
|
|
|
|
/*
|
|
* do not install redirect route, if the number of entries
|
|
* is too much (> hiwat). note that, the node (= host) will
|
|
* work just fine even if we do not install redirect route
|
|
* (there will be additional hops, though).
|
|
*/
|
|
rtcount = rt_timer_count(icmp6_redirect_timeout_q);
|
|
if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat)
|
|
return;
|
|
else if (0 <= icmp6_redirect_lowat &&
|
|
rtcount > icmp6_redirect_lowat) {
|
|
/*
|
|
* XXX nuke a victim, install the new one.
|
|
*/
|
|
}
|
|
|
|
bzero(&sdst, sizeof(sdst));
|
|
bzero(&sgw, sizeof(sgw));
|
|
bzero(&ssrc, sizeof(ssrc));
|
|
sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
|
|
sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
|
|
sizeof(struct sockaddr_in6);
|
|
bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
|
|
bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
|
|
bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
|
|
rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
|
|
(struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
|
|
(struct sockaddr *)&ssrc,
|
|
&newrt);
|
|
|
|
if (newrt) {
|
|
(void)rt_timer_add(newrt, icmp6_redirect_timeout,
|
|
icmp6_redirect_timeout_q);
|
|
rtfree(newrt);
|
|
}
|
|
}
|
|
/* finally update cached route in each socket via pfctlinput */
|
|
{
|
|
struct sockaddr_in6 sdst;
|
|
|
|
bzero(&sdst, sizeof(sdst));
|
|
sdst.sin6_family = AF_INET6;
|
|
sdst.sin6_len = sizeof(struct sockaddr_in6);
|
|
bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
|
|
pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
|
|
#ifdef IPSEC
|
|
key_sa_routechange((struct sockaddr *)&sdst);
|
|
#endif
|
|
}
|
|
|
|
freeit:
|
|
m_freem(m);
|
|
return;
|
|
|
|
bad:
|
|
icmp6stat.icp6s_badredirect++;
|
|
m_freem(m);
|
|
}
|
|
|
|
void
|
|
icmp6_redirect_output(m0, rt)
|
|
struct mbuf *m0;
|
|
struct rtentry *rt;
|
|
{
|
|
struct ifnet *ifp; /* my outgoing interface */
|
|
struct in6_addr *ifp_ll6;
|
|
struct in6_addr *nexthop;
|
|
struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
|
|
struct mbuf *m = NULL; /* newly allocated one */
|
|
struct ip6_hdr *ip6; /* m as struct ip6_hdr */
|
|
struct nd_redirect *nd_rd;
|
|
size_t maxlen;
|
|
u_char *p;
|
|
struct sockaddr_in6 src_sa;
|
|
|
|
icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
|
|
|
|
/* if we are not router, we don't send icmp6 redirect */
|
|
if (!ip6_forwarding)
|
|
goto fail;
|
|
|
|
/* sanity check */
|
|
if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
|
|
goto fail;
|
|
|
|
/*
|
|
* Address check:
|
|
* the source address must identify a neighbor, and
|
|
* the destination address must not be a multicast address
|
|
* [RFC 2461, sec 8.2]
|
|
*/
|
|
sip6 = mtod(m0, struct ip6_hdr *);
|
|
bzero(&src_sa, sizeof(src_sa));
|
|
src_sa.sin6_family = AF_INET6;
|
|
src_sa.sin6_len = sizeof(src_sa);
|
|
src_sa.sin6_addr = sip6->ip6_src;
|
|
/* we don't currently use sin6_scope_id, but eventually use it */
|
|
src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
|
|
if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
|
|
goto fail;
|
|
if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
|
|
goto fail; /* what should we do here? */
|
|
|
|
/* rate limit */
|
|
if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
|
|
goto fail;
|
|
|
|
/*
|
|
* Since we are going to append up to 1280 bytes (= IPV6_MMTU),
|
|
* we almost always ask for an mbuf cluster for simplicity.
|
|
* (MHLEN < IPV6_MMTU is almost always true)
|
|
*/
|
|
#if IPV6_MMTU >= MCLBYTES
|
|
# error assumption failed about IPV6_MMTU and MCLBYTES
|
|
#endif
|
|
MGETHDR(m, M_DONTWAIT, MT_HEADER);
|
|
if (m && IPV6_MMTU >= MHLEN)
|
|
MCLGET(m, M_DONTWAIT);
|
|
if (!m)
|
|
goto fail;
|
|
m->m_pkthdr.rcvif = NULL;
|
|
m->m_len = 0;
|
|
maxlen = M_TRAILINGSPACE(m);
|
|
maxlen = min(IPV6_MMTU, maxlen);
|
|
/* just for safety */
|
|
if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
|
|
((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
|
|
goto fail;
|
|
}
|
|
|
|
{
|
|
/* get ip6 linklocal address for ifp(my outgoing interface). */
|
|
struct in6_ifaddr *ia;
|
|
if ((ia = in6ifa_ifpforlinklocal(ifp,
|
|
IN6_IFF_NOTREADY|
|
|
IN6_IFF_ANYCAST)) == NULL)
|
|
goto fail;
|
|
ifp_ll6 = &ia->ia_addr.sin6_addr;
|
|
}
|
|
|
|
/* get ip6 linklocal address for the router. */
|
|
if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
|
|
struct sockaddr_in6 *sin6;
|
|
sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
|
|
nexthop = &sin6->sin6_addr;
|
|
if (!IN6_IS_ADDR_LINKLOCAL(nexthop))
|
|
nexthop = NULL;
|
|
} else
|
|
nexthop = NULL;
|
|
|
|
/* ip6 */
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
|
/* ip6->ip6_plen will be set later */
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
ip6->ip6_hlim = 255;
|
|
/* ip6->ip6_src must be linklocal addr for my outgoing if. */
|
|
bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
|
|
bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
|
|
|
|
/* ND Redirect */
|
|
nd_rd = (struct nd_redirect *)(ip6 + 1);
|
|
nd_rd->nd_rd_type = ND_REDIRECT;
|
|
nd_rd->nd_rd_code = 0;
|
|
nd_rd->nd_rd_reserved = 0;
|
|
if (rt->rt_flags & RTF_GATEWAY) {
|
|
/*
|
|
* nd_rd->nd_rd_target must be a link-local address in
|
|
* better router cases.
|
|
*/
|
|
if (!nexthop)
|
|
goto fail;
|
|
bcopy(nexthop, &nd_rd->nd_rd_target,
|
|
sizeof(nd_rd->nd_rd_target));
|
|
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
|
|
sizeof(nd_rd->nd_rd_dst));
|
|
} else {
|
|
/* make sure redtgt == reddst */
|
|
nexthop = &sip6->ip6_dst;
|
|
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
|
|
sizeof(nd_rd->nd_rd_target));
|
|
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
|
|
sizeof(nd_rd->nd_rd_dst));
|
|
}
|
|
|
|
p = (u_char *)(nd_rd + 1);
|
|
|
|
{
|
|
/* target lladdr option */
|
|
struct rtentry *rt_nexthop = NULL;
|
|
int len;
|
|
struct sockaddr_dl *sdl;
|
|
struct nd_opt_hdr *nd_opt;
|
|
char *lladdr;
|
|
|
|
rt_nexthop = nd6_lookup(nexthop, 0, ifp);
|
|
if (!rt_nexthop)
|
|
goto nolladdropt;
|
|
len = sizeof(*nd_opt) + ifp->if_addrlen;
|
|
len = (len + 7) & ~7; /* round by 8 */
|
|
/* safety check */
|
|
if (len + (p - (u_char *)ip6) > maxlen)
|
|
goto nolladdropt;
|
|
if (!(rt_nexthop->rt_flags & RTF_GATEWAY) &&
|
|
(rt_nexthop->rt_flags & RTF_LLINFO) &&
|
|
(rt_nexthop->rt_gateway->sa_family == AF_LINK) &&
|
|
(sdl = (struct sockaddr_dl *)rt_nexthop->rt_gateway) &&
|
|
sdl->sdl_alen) {
|
|
nd_opt = (struct nd_opt_hdr *)p;
|
|
nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
|
|
nd_opt->nd_opt_len = len >> 3;
|
|
lladdr = (char *)(nd_opt + 1);
|
|
bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
|
|
p += len;
|
|
}
|
|
}
|
|
nolladdropt:;
|
|
|
|
m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
|
|
|
|
/* just to be safe */
|
|
if (m0->m_flags & M_DECRYPTED)
|
|
goto noredhdropt;
|
|
if (p - (u_char *)ip6 > maxlen)
|
|
goto noredhdropt;
|
|
|
|
{
|
|
/* redirected header option */
|
|
int len;
|
|
struct nd_opt_rd_hdr *nd_opt_rh;
|
|
|
|
/*
|
|
* compute the maximum size for icmp6 redirect header option.
|
|
* XXX room for auth header?
|
|
*/
|
|
len = maxlen - (p - (u_char *)ip6);
|
|
len &= ~7;
|
|
|
|
/*
|
|
* Redirected header option spec (RFC2461 4.6.3) talks nothing
|
|
* about padding/truncate rule for the original IP packet.
|
|
* From the discussion on IPv6imp in Feb 1999,
|
|
* the consensus was:
|
|
* - "attach as much as possible" is the goal
|
|
* - pad if not aligned (original size can be guessed by
|
|
* original ip6 header)
|
|
* Following code adds the padding if it is simple enough,
|
|
* and truncates if not.
|
|
*/
|
|
if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
|
|
/* not enough room, truncate */
|
|
m_adj(m0, (len - sizeof(*nd_opt_rh)) -
|
|
m0->m_pkthdr.len);
|
|
} else {
|
|
/*
|
|
* enough room, truncate if not aligned.
|
|
* we don't pad here for simplicity.
|
|
*/
|
|
size_t extra;
|
|
|
|
extra = m0->m_pkthdr.len % 8;
|
|
if (extra) {
|
|
/* truncate */
|
|
m_adj(m0, -extra);
|
|
}
|
|
len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
|
|
}
|
|
|
|
nd_opt_rh = (struct nd_opt_rd_hdr *)p;
|
|
bzero(nd_opt_rh, sizeof(*nd_opt_rh));
|
|
nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
|
|
nd_opt_rh->nd_opt_rh_len = len >> 3;
|
|
p += sizeof(*nd_opt_rh);
|
|
m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
|
|
|
|
/* connect m0 to m */
|
|
m->m_pkthdr.len += m0->m_pkthdr.len;
|
|
m_cat(m, m0);
|
|
m0 = NULL;
|
|
}
|
|
noredhdropt:
|
|
if (m0) {
|
|
m_freem(m0);
|
|
m0 = NULL;
|
|
}
|
|
|
|
if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
|
|
sip6->ip6_src.s6_addr16[1] = 0;
|
|
if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
|
|
sip6->ip6_dst.s6_addr16[1] = 0;
|
|
#if 0
|
|
if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
|
|
ip6->ip6_src.s6_addr16[1] = 0;
|
|
if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
|
|
ip6->ip6_dst.s6_addr16[1] = 0;
|
|
#endif
|
|
if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
|
|
nd_rd->nd_rd_target.s6_addr16[1] = 0;
|
|
if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
|
|
nd_rd->nd_rd_dst.s6_addr16[1] = 0;
|
|
|
|
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
|
|
|
|
nd_rd->nd_rd_cksum = 0;
|
|
nd_rd->nd_rd_cksum
|
|
= in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
|
|
|
|
/* send the packet to outside... */
|
|
#ifdef IPSEC
|
|
/* Don't lookup socket */
|
|
(void)ipsec_setsocket(m, NULL);
|
|
#endif /* IPSEC */
|
|
if (ip6_output(m, NULL, NULL, 0, NULL, NULL) != 0)
|
|
icmp6_ifstat_inc(ifp, ifs6_out_error);
|
|
|
|
icmp6_ifstat_inc(ifp, ifs6_out_msg);
|
|
icmp6_ifstat_inc(ifp, ifs6_out_redirect);
|
|
icmp6stat.icp6s_outhist[ND_REDIRECT]++;
|
|
|
|
return;
|
|
|
|
fail:
|
|
if (m)
|
|
m_freem(m);
|
|
if (m0)
|
|
m_freem(m0);
|
|
}
|
|
|
|
/*
|
|
* ICMPv6 socket option processing.
|
|
*/
|
|
int
|
|
icmp6_ctloutput(op, so, level, optname, mp)
|
|
int op;
|
|
struct socket *so;
|
|
int level, optname;
|
|
struct mbuf **mp;
|
|
{
|
|
int error = 0;
|
|
int optlen;
|
|
struct in6pcb *in6p = sotoin6pcb(so);
|
|
struct mbuf *m = *mp;
|
|
|
|
optlen = m ? m->m_len : 0;
|
|
|
|
if (level != IPPROTO_ICMPV6) {
|
|
if (op == PRCO_SETOPT && m)
|
|
(void)m_free(m);
|
|
return EINVAL;
|
|
}
|
|
|
|
switch (op) {
|
|
case PRCO_SETOPT:
|
|
switch (optname) {
|
|
case ICMP6_FILTER:
|
|
{
|
|
struct icmp6_filter *p;
|
|
|
|
if (optlen != sizeof(*p)) {
|
|
error = EMSGSIZE;
|
|
break;
|
|
}
|
|
p = mtod(m, struct icmp6_filter *);
|
|
if (!p || !in6p->in6p_icmp6filt) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
bcopy(p, in6p->in6p_icmp6filt,
|
|
sizeof(struct icmp6_filter));
|
|
error = 0;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
if (m)
|
|
(void)m_freem(m);
|
|
break;
|
|
|
|
case PRCO_GETOPT:
|
|
switch (optname) {
|
|
case ICMP6_FILTER:
|
|
{
|
|
struct icmp6_filter *p;
|
|
|
|
if (!in6p->in6p_icmp6filt) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
*mp = m = m_get(M_WAIT, MT_SOOPTS);
|
|
m->m_len = sizeof(struct icmp6_filter);
|
|
p = mtod(m, struct icmp6_filter *);
|
|
bcopy(in6p->in6p_icmp6filt, p,
|
|
sizeof(struct icmp6_filter));
|
|
error = 0;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Perform rate limit check.
|
|
* Returns 0 if it is okay to send the icmp6 packet.
|
|
* Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
|
|
* limitation.
|
|
*
|
|
* XXX per-destination/type check necessary?
|
|
*/
|
|
static int
|
|
icmp6_ratelimit(dst, type, code)
|
|
const struct in6_addr *dst; /* not used at this moment */
|
|
const int type; /* not used at this moment */
|
|
const int code; /* not used at this moment */
|
|
{
|
|
int ret;
|
|
|
|
ret = 0; /* okay to send */
|
|
|
|
/* PPS limit */
|
|
if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
|
|
icmp6errppslim)) {
|
|
/* The packet is subject to rate limit */
|
|
ret++;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct rtentry *
|
|
icmp6_mtudisc_clone(dst)
|
|
struct sockaddr *dst;
|
|
{
|
|
struct rtentry *rt;
|
|
int error;
|
|
|
|
rt = rtalloc1(dst, 1);
|
|
if (rt == 0)
|
|
return NULL;
|
|
|
|
/* If we didn't get a host route, allocate one */
|
|
if ((rt->rt_flags & RTF_HOST) == 0) {
|
|
struct rtentry *nrt;
|
|
|
|
error = rtrequest((int) RTM_ADD, dst,
|
|
(struct sockaddr *) rt->rt_gateway,
|
|
(struct sockaddr *) 0,
|
|
RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt);
|
|
if (error) {
|
|
rtfree(rt);
|
|
return NULL;
|
|
}
|
|
nrt->rt_rmx = rt->rt_rmx;
|
|
rtfree(rt);
|
|
rt = nrt;
|
|
}
|
|
error = rt_timer_add(rt, icmp6_mtudisc_timeout,
|
|
icmp6_mtudisc_timeout_q);
|
|
if (error) {
|
|
rtfree(rt);
|
|
return NULL;
|
|
}
|
|
|
|
return rt; /* caller need to call rtfree() */
|
|
}
|
|
|
|
static void
|
|
icmp6_mtudisc_timeout(rt, r)
|
|
struct rtentry *rt;
|
|
struct rttimer *r;
|
|
{
|
|
if (rt == NULL)
|
|
panic("icmp6_mtudisc_timeout: bad route to timeout");
|
|
if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) ==
|
|
(RTF_DYNAMIC | RTF_HOST)) {
|
|
rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt),
|
|
rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
|
|
} else {
|
|
if (!(rt->rt_rmx.rmx_locks & RTV_MTU))
|
|
rt->rt_rmx.rmx_mtu = 0;
|
|
}
|
|
}
|
|
|
|
static void
|
|
icmp6_redirect_timeout(rt, r)
|
|
struct rtentry *rt;
|
|
struct rttimer *r;
|
|
{
|
|
if (rt == NULL)
|
|
panic("icmp6_redirect_timeout: bad route to timeout");
|
|
if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) ==
|
|
(RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) {
|
|
rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt),
|
|
rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
|
|
}
|
|
}
|
|
|
|
int
|
|
icmp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
|
|
int *name;
|
|
u_int namelen;
|
|
void *oldp;
|
|
size_t *oldlenp;
|
|
void *newp;
|
|
size_t newlen;
|
|
{
|
|
|
|
/* All sysctl names at this level are terminal. */
|
|
if (namelen != 1)
|
|
return ENOTDIR;
|
|
|
|
switch (name[0]) {
|
|
|
|
case ICMPV6CTL_REDIRACCEPT:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&icmp6_rediraccept);
|
|
case ICMPV6CTL_REDIRTIMEOUT:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&icmp6_redirtimeout);
|
|
case ICMPV6CTL_STATS:
|
|
return sysctl_rdstruct(oldp, oldlenp, newp,
|
|
&icmp6stat, sizeof(icmp6stat));
|
|
case ICMPV6CTL_ND6_PRUNE:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_prune);
|
|
case ICMPV6CTL_ND6_DELAY:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_delay);
|
|
case ICMPV6CTL_ND6_UMAXTRIES:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_umaxtries);
|
|
case ICMPV6CTL_ND6_MMAXTRIES:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_mmaxtries);
|
|
case ICMPV6CTL_ND6_USELOOPBACK:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&nd6_useloopback);
|
|
case ICMPV6CTL_NODEINFO:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_nodeinfo);
|
|
case ICMPV6CTL_ERRPPSLIMIT:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6errppslim);
|
|
case ICMPV6CTL_ND6_MAXNUDHINT:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&nd6_maxnudhint);
|
|
case ICMPV6CTL_MTUDISC_HIWAT:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&icmp6_mtudisc_hiwat);
|
|
case ICMPV6CTL_MTUDISC_LOWAT:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen,
|
|
&icmp6_mtudisc_lowat);
|
|
case ICMPV6CTL_ND6_DEBUG:
|
|
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_debug);
|
|
case ICMPV6CTL_ND6_DRLIST:
|
|
case ICMPV6CTL_ND6_PRLIST:
|
|
return nd6_sysctl(name[0], oldp, oldlenp, newp, newlen);
|
|
default:
|
|
return ENOPROTOOPT;
|
|
}
|
|
/* NOTREACHED */
|
|
}
|