2925 lines
77 KiB
C
2925 lines
77 KiB
C
/* $NetBSD: icmp6.c,v 1.162 2013/06/05 19:01:26 christos 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 1.162 2013/06/05 19:01:26 christos 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 <netinet6/ip6_private.h>
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#include <netinet/icmp6.h>
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#include <netinet6/icmp6_private.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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#include <netinet6/scope6_var.h>
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#ifdef IPSEC
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#include <netipsec/ipsec.h>
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#include <netipsec/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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percpu_t *icmp6stat_percpu;
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extern struct inpcbtable raw6cbtable;
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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)(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(u_int, int, int);
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static int icmp6_rip6_input(struct mbuf **, int);
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static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
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static const char *icmp6_redirect_diag(struct in6_addr *,
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struct in6_addr *, struct in6_addr *);
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static struct mbuf *ni6_input(struct mbuf *, int);
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static struct mbuf *ni6_nametodns(const char *, int, int);
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static int ni6_dnsmatch(const char *, int, const char *, int);
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static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *,
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struct ifnet **, char *);
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static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
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struct ifnet *, int);
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static int icmp6_notify_error(struct mbuf *, int, int, int);
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static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *);
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static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *);
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static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *);
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static void sysctl_net_inet6_icmp6_setup(struct sysctllog **);
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void
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icmp6_init(void)
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{
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sysctl_net_inet6_icmp6_setup(NULL);
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mld_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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icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS);
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}
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static void
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icmp6_errcount(u_int base, int type, int 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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ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE);
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return;
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case ICMP6_DST_UNREACH_ADMIN:
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ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN);
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return;
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case ICMP6_DST_UNREACH_BEYONDSCOPE:
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ICMP6_STATINC(base +
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ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE);
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return;
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case ICMP6_DST_UNREACH_ADDR:
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ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR);
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return;
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case ICMP6_DST_UNREACH_NOPORT:
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ICMP6_STATINC(base + ICMP6_ERRSTAT_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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ICMP6_STATINC(base + ICMP6_ERRSTAT_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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ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT);
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return;
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case ICMP6_TIME_EXCEED_REASSEMBLY:
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ICMP6_STATINC(base +
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ICMP6_ERRSTAT_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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ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER);
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return;
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case ICMP6_PARAMPROB_NEXTHEADER:
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ICMP6_STATINC(base +
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ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER);
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return;
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case ICMP6_PARAMPROB_OPTION:
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ICMP6_STATINC(base + ICMP6_ERRSTAT_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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ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT);
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return;
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}
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ICMP6_STATINC(base + ICMP6_ERRSTAT_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(void (*func)(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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* A wrapper function for icmp6_error() necessary when the erroneous packet
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* may not contain enough scope zone information.
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*/
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void
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icmp6_error2(struct mbuf *m, int type, int code, int param,
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struct ifnet *ifp)
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{
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struct ip6_hdr *ip6;
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if (ifp == NULL)
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return;
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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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ip6 = mtod(m, struct ip6_hdr *);
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if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
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return;
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if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
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return;
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icmp6_error(m, type, code, param);
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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(struct mbuf *m, int type, int code, int 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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ICMP6_STATINC(ICMP6_STAT_ERROR);
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/* count per-type-code statistics */
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icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code);
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if (m->m_flags & M_DECRYPTED) {
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ICMP6_STATINC(ICMP6_STAT_CANTERROR);
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goto freeit;
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}
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if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) &&
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(m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL)
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return;
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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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ICMP6_STATINC(ICMP6_STAT_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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ICMP6_STATINC(ICMP6_STAT_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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ICMP6_STATINC(ICMP6_STAT_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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ICMP6_STATINC(ICMP6_STAT_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_UNWRITABLE(m, 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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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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in6_clearscope(&oip6->ip6_src);
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in6_clearscope(&oip6->ip6_dst);
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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 output path,
|
|
* and if we are in output path rcvif could contain bogus value.
|
|
* clear m->m_pkthdr.rcvif for safety, we should have enough scope
|
|
* information in ip header (nip6).
|
|
*/
|
|
m->m_pkthdr.rcvif = NULL;
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|
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ICMP6_STATINC(ICMP6_STAT_OUTHIST + type);
|
|
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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/*
|
|
* If we can't tell whether or not we can generate ICMP6, free it.
|
|
*/
|
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m_freem(m);
|
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}
|
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|
|
/*
|
|
* Process a received ICMP6 message.
|
|
*/
|
|
int
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icmp6_input(struct mbuf **mp, int *offp, int proto)
|
|
{
|
|
struct mbuf *m = *mp, *n;
|
|
struct ip6_hdr *ip6, *nip6;
|
|
struct icmp6_hdr *icmp6, *nicmp6;
|
|
int off = *offp;
|
|
int icmp6len = m->m_pkthdr.len - *offp;
|
|
int code, sum, noff, i;
|
|
|
|
#define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4)
|
|
KASSERT(ICMP6_MAXLEN < MCLBYTES);
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
|
|
|
|
/*
|
|
* Locate icmp6 structure in mbuf, and check
|
|
* that not corrupted and of at least minimum length
|
|
*/
|
|
|
|
if (icmp6len < sizeof(struct icmp6_hdr)) {
|
|
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
|
|
goto freeit;
|
|
}
|
|
|
|
i = off + sizeof(*icmp6);
|
|
if ((m->m_len < i || M_READONLY(m)) && (m = m_pullup(m, i)) == 0) {
|
|
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
|
|
#if 0 /* m is 0 here */
|
|
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
|
|
#endif
|
|
goto freeit;
|
|
}
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
/*
|
|
* calculate the checksum
|
|
*/
|
|
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
|
|
if (icmp6 == NULL) {
|
|
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
|
|
/* m is invalid */
|
|
/*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)));
|
|
ICMP6_STATINC(ICMP6_STAT_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 deliver 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
|
|
|
|
ICMP6_STATINC(ICMP6_STAT_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);
|
|
|
|
/*
|
|
* MTU is checked in icmp6_mtudisc.
|
|
*/
|
|
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 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_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
|
/* Give up local */
|
|
n = m;
|
|
m = NULL;
|
|
} else if (M_READONLY(n) ||
|
|
n->m_len < off + sizeof(struct icmp6_hdr)) {
|
|
struct mbuf *n0 = n;
|
|
|
|
/*
|
|
* Prepare an internal mbuf. m_pullup() doesn't
|
|
* always copy the length we specified.
|
|
*/
|
|
if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
|
|
/* Give up local */
|
|
n = m;
|
|
m = NULL;
|
|
}
|
|
m_freem(n0);
|
|
}
|
|
IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
|
|
sizeof(*nicmp6));
|
|
nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
|
|
nicmp6->icmp6_code = 0;
|
|
if (n) {
|
|
uint64_t *icmp6s = ICMP6_STAT_GETREF();
|
|
icmp6s[ICMP6_STAT_REFLECT]++;
|
|
icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++;
|
|
ICMP6_STAT_PUTREF();
|
|
icmp6_reflect(n, off);
|
|
}
|
|
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 */
|
|
mld_input(m, off);
|
|
m = NULL;
|
|
goto freeit;
|
|
}
|
|
mld_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 maxhlen;
|
|
|
|
if ((icmp6_nodeinfo & 5) != 5)
|
|
break;
|
|
|
|
if (code != 0)
|
|
goto badcode;
|
|
MGETHDR(n, M_DONTWAIT, m->m_type);
|
|
if (n && ICMP6_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) - ICMP6_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);
|
|
memset(p, 0, 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) {
|
|
uint64_t *icmp6s = ICMP6_STAT_GETREF();
|
|
icmp6s[ICMP6_STAT_REFLECT]++;
|
|
icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++;
|
|
ICMP6_STAT_PUTREF();
|
|
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:
|
|
ICMP6_STATINC(ICMP6_STAT_BADCODE);
|
|
break;
|
|
|
|
badlen:
|
|
ICMP6_STATINC(ICMP6_STAT_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(struct mbuf *m, int off, int icmp6len, int code)
|
|
{
|
|
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)) {
|
|
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
|
|
goto freeit;
|
|
}
|
|
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
|
|
sizeof(*icmp6) + sizeof(struct ip6_hdr));
|
|
if (icmp6 == NULL) {
|
|
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
|
|
return (-1);
|
|
}
|
|
eip6 = (struct ip6_hdr *)(icmp6 + 1);
|
|
|
|
/* Detect the upper level protocol */
|
|
{
|
|
void (*ctlfunc)(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) {
|
|
ICMP6_STATINC(ICMP6_STAT_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) {
|
|
ICMP6_STATINC(ICMP6_STAT_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) {
|
|
ICMP6_STATINC(ICMP6_STAT_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) {
|
|
ICMP6_STATINC(ICMP6_STAT_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) {
|
|
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* retrieve parameters from the inner IPv6 header, and convert
|
|
* them into sockaddr structures.
|
|
* XXX: there is no guarantee that the source or destination
|
|
* addresses of the inner packet are in the same scope zone as
|
|
* the addresses of the icmp packet. But there is no other
|
|
* way to determine the zone.
|
|
*/
|
|
eip6 = (struct ip6_hdr *)(icmp6 + 1);
|
|
|
|
sockaddr_in6_init(&icmp6dst,
|
|
(finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0);
|
|
if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
|
|
goto freeit;
|
|
sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0);
|
|
if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
|
|
goto freeit;
|
|
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 (*)(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(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;
|
|
|
|
/*
|
|
* The MTU should not be less than the minimal IPv6 MTU except for the
|
|
* hack in ip6_output/ip6_setpmtu where we always include a frag header.
|
|
* In that one case, the MTU might be less than 1280.
|
|
*/
|
|
if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) {
|
|
/* is the mtu even sane? */
|
|
if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
|
|
return;
|
|
if (!validated)
|
|
return;
|
|
mtu = IPV6_MMTU - sizeof(struct ip6_frag);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
memset(&sin6, 0, sizeof(sin6));
|
|
sin6.sin6_family = PF_INET6;
|
|
sin6.sin6_len = sizeof(struct sockaddr_in6);
|
|
sin6.sin6_addr = *dst;
|
|
if (in6_setscope(&sin6.sin6_addr, m->m_pkthdr.rcvif, NULL))
|
|
return;
|
|
|
|
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)) {
|
|
ICMP6_STATINC(ICMP6_STAT_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)
|
|
*/
|
|
static struct mbuf *
|
|
ni6_input(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; /* ip6_dst */
|
|
struct in6_addr in6_subj; /* subject address */
|
|
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.]
|
|
*/
|
|
sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0);
|
|
/* 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:
|
|
case NI_QTYPE_IPV4ADDR:
|
|
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, (void *)&in6_subj);
|
|
if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
|
|
goto bad;
|
|
|
|
subj = (char *)&in6_subj;
|
|
if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
|
|
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:
|
|
case NI_QTYPE_IPV4ADDR:
|
|
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;
|
|
case NI_QTYPE_IPV4ADDR:
|
|
/* unsupported - should respond with unknown Qtype? */
|
|
goto bad;
|
|
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_MOVE_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, void *), mtod(n, void *), sizeof(struct ip6_hdr));
|
|
nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
|
|
bcopy((void *)ni6, (void *)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, char *) +
|
|
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.
|
|
*
|
|
* old - return pascal string if non-zero
|
|
*/
|
|
static struct mbuf *
|
|
ni6_nametodns(const char *name, int namelen, int old)
|
|
{
|
|
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(const char *a, int alen, const char *b, int blen)
|
|
{
|
|
const char *a0, *b0;
|
|
int l;
|
|
|
|
/* simplest case - need validation? */
|
|
if (alen == blen && memcmp(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 (memcmp(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(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);
|
|
}
|
|
}
|
|
|
|
IFNET_FOREACH(ifp) {
|
|
addrsofif = 0;
|
|
IFADDR_FOREACH(ifa, ifp) {
|
|
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(struct icmp6_nodeinfo *ni6,
|
|
struct icmp6_nodeinfo *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))
|
|
{
|
|
IFADDR_FOREACH(ifa, ifp) {
|
|
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_second)
|
|
ltime = ifa6->ia6_lifetime.ia6t_expire -
|
|
time_second;
|
|
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));
|
|
in6_clearscope((struct in6_addr *)cp); /* XXX */
|
|
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(struct mbuf **mp, int off)
|
|
{
|
|
struct mbuf *m = *mp;
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
|
struct inpcb_hdr *inph;
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* XXX: the address may have embedded scope zone ID, which should be
|
|
* hidden from applications.
|
|
*/
|
|
sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0);
|
|
if (sa6_recoverscope(&rip6src)) {
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
CIRCLEQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) {
|
|
in6p = (struct in6pcb *)inph;
|
|
if (in6p->in6p_af != AF_INET6)
|
|
continue;
|
|
if (in6p->in6p_ip6.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);
|
|
IP6_STATDEC(IP6_STAT_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(struct mbuf *m, size_t off)
|
|
{
|
|
struct ip6_hdr *ip6;
|
|
struct icmp6_hdr *icmp6;
|
|
const struct in6_ifaddr *ia;
|
|
const struct ip6aux *ip6a;
|
|
int plen;
|
|
int type, code;
|
|
struct ifnet *outif = NULL;
|
|
struct in6_addr origdst;
|
|
const struct in6_addr *src = NULL;
|
|
|
|
/* 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), (void *)&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((void *)&nip6, mtod(m, void *), 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. */
|
|
|
|
origdst = 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;
|
|
|
|
/*
|
|
* 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 should be VERY rare, but is possible
|
|
* (for example) when we encounter an error while forwarding procedure
|
|
* destined to a duplicated address of ours.
|
|
* Note that ip6_getdstifaddr() may fail if we are in an error handling
|
|
* procedure of an outgoing packet of our own, in which case we need
|
|
* to search in the ifaddr list.
|
|
*/
|
|
if (IN6_IS_ADDR_MULTICAST(&origdst))
|
|
;
|
|
else if ((ip6a = ip6_getdstifaddr(m)) != NULL) {
|
|
if ((ip6a->ip6a_flags &
|
|
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0)
|
|
src = &ip6a->ip6a_src;
|
|
} else {
|
|
union {
|
|
struct sockaddr_in6 sin6;
|
|
struct sockaddr sa;
|
|
} u;
|
|
|
|
sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0);
|
|
|
|
ia = (struct in6_ifaddr *)ifa_ifwithaddr(&u.sa);
|
|
|
|
if (ia == NULL)
|
|
;
|
|
else if ((ia->ia6_flags &
|
|
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0)
|
|
src = &ia->ia_addr.sin6_addr;
|
|
}
|
|
|
|
if (src == NULL) {
|
|
int e;
|
|
struct sockaddr_in6 sin6;
|
|
struct route 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.
|
|
*/
|
|
/* zone ID should be embedded */
|
|
sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0);
|
|
|
|
memset(&ro, 0, sizeof(ro));
|
|
src = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, &outif, &e);
|
|
rtcache_free(&ro);
|
|
if (src == NULL) {
|
|
nd6log((LOG_DEBUG,
|
|
"icmp6_reflect: source can't be determined: "
|
|
"dst=%s, error=%d\n",
|
|
ip6_sprintf(&sin6.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;
|
|
|
|
m->m_pkthdr.csum_flags = 0;
|
|
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);
|
|
|
|
/*
|
|
* 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, 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;
|
|
}
|
|
|
|
static const char *
|
|
icmp6_redirect_diag(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(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;
|
|
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) {
|
|
ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
|
|
return;
|
|
}
|
|
redtgt6 = nd_rd->nd_rd_target;
|
|
reddst6 = nd_rd->nd_rd_dst;
|
|
|
|
if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
|
|
in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
|
|
goto freeit;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0);
|
|
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 (memcmp(&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 (memcmp(&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 (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 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes)
|
|
goto freeit;
|
|
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.
|
|
*/
|
|
}
|
|
|
|
memset(&sdst, 0, sizeof(sdst));
|
|
memset(&sgw, 0, sizeof(sgw));
|
|
memset(&ssrc, 0, 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,
|
|
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;
|
|
|
|
sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0);
|
|
pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
|
|
#if defined(IPSEC)
|
|
key_sa_routechange((struct sockaddr *)&sdst);
|
|
#endif
|
|
}
|
|
|
|
freeit:
|
|
m_freem(m);
|
|
return;
|
|
|
|
bad:
|
|
ICMP6_STATINC(ICMP6_STAT_BADREDIRECT);
|
|
m_freem(m);
|
|
}
|
|
|
|
void
|
|
icmp6_redirect_output(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(ICMP6_STAT_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 *);
|
|
sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0);
|
|
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)
|
|
*/
|
|
MGETHDR(m, M_DONTWAIT, MT_HEADER);
|
|
if (m && IPV6_MMTU >= MHLEN) {
|
|
#if IPV6_MMTU >= MCLBYTES
|
|
_MCLGET(m, mcl_cache, IPV6_MMTU, M_DONTWAIT);
|
|
#else
|
|
MCLGET(m, M_DONTWAIT);
|
|
#endif
|
|
}
|
|
|
|
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;
|
|
const 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 = satocsdl(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);
|
|
memcpy(lladdr, CLLADDR(sdl), 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;
|
|
memset(nd_opt_rh, 0, 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;
|
|
}
|
|
|
|
/* XXX: clear embedded link IDs in the inner header */
|
|
in6_clearscope(&sip6->ip6_src);
|
|
in6_clearscope(&sip6->ip6_dst);
|
|
in6_clearscope(&nd_rd->nd_rd_target);
|
|
in6_clearscope(&nd_rd->nd_rd_dst);
|
|
|
|
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... */
|
|
if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0)
|
|
icmp6_ifstat_inc(ifp, ifs6_out_error);
|
|
|
|
icmp6_ifstat_inc(ifp, ifs6_out_msg);
|
|
icmp6_ifstat_inc(ifp, ifs6_out_redirect);
|
|
ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT);
|
|
|
|
return;
|
|
|
|
fail:
|
|
if (m)
|
|
m_freem(m);
|
|
if (m0)
|
|
m_freem(m0);
|
|
}
|
|
|
|
/*
|
|
* ICMPv6 socket option processing.
|
|
*/
|
|
int
|
|
icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt)
|
|
{
|
|
int error = 0;
|
|
struct in6pcb *in6p = sotoin6pcb(so);
|
|
|
|
if (sopt->sopt_level != IPPROTO_ICMPV6)
|
|
return rip6_ctloutput(op, so, sopt);
|
|
|
|
switch (op) {
|
|
case PRCO_SETOPT:
|
|
switch (sopt->sopt_name) {
|
|
case ICMP6_FILTER:
|
|
{
|
|
struct icmp6_filter fil;
|
|
|
|
error = sockopt_get(sopt, &fil, sizeof(fil));
|
|
if (error)
|
|
break;
|
|
memcpy(in6p->in6p_icmp6filt, &fil,
|
|
sizeof(struct icmp6_filter));
|
|
error = 0;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case PRCO_GETOPT:
|
|
switch (sopt->sopt_name) {
|
|
case ICMP6_FILTER:
|
|
{
|
|
if (in6p->in6p_icmp6filt == NULL) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
error = sockopt_set(sopt, in6p->in6p_icmp6filt,
|
|
sizeof(struct icmp6_filter));
|
|
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(
|
|
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(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, NULL,
|
|
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(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, rt_getkey(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(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, rt_getkey(rt),
|
|
rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly?
|
|
*/
|
|
static int
|
|
sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS)
|
|
{
|
|
(void)&name;
|
|
(void)&l;
|
|
(void)&oname;
|
|
|
|
if (namelen != 0)
|
|
return (EINVAL);
|
|
|
|
return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp,
|
|
/*XXXUNCONST*/
|
|
__UNCONST(newp), newlen));
|
|
}
|
|
|
|
static int
|
|
sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS)
|
|
{
|
|
|
|
return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS));
|
|
}
|
|
|
|
static void
|
|
sysctl_net_inet6_icmp6_setup(struct sysctllog **clog)
|
|
{
|
|
extern int nd6_maxqueuelen; /* defined in nd6.c */
|
|
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_NODE, "net", NULL,
|
|
NULL, 0, NULL, 0,
|
|
CTL_NET, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_NODE, "inet6", NULL,
|
|
NULL, 0, NULL, 0,
|
|
CTL_NET, PF_INET6, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_NODE, "icmp6",
|
|
SYSCTL_DESCR("ICMPv6 related settings"),
|
|
NULL, 0, NULL, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL);
|
|
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_STRUCT, "stats",
|
|
SYSCTL_DESCR("ICMPv6 transmission statistics"),
|
|
sysctl_net_inet6_icmp6_stats, 0, NULL, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_STATS, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "rediraccept",
|
|
SYSCTL_DESCR("Accept and process redirect messages"),
|
|
NULL, 0, &icmp6_rediraccept, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_REDIRACCEPT, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "redirtimeout",
|
|
SYSCTL_DESCR("Redirect generated route lifetime"),
|
|
NULL, 0, &icmp6_redirtimeout, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_REDIRTIMEOUT, CTL_EOL);
|
|
#if 0 /* obsoleted */
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "errratelimit", NULL,
|
|
NULL, 0, &icmp6_errratelimit, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_ERRRATELIMIT, CTL_EOL);
|
|
#endif
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "nd6_prune",
|
|
SYSCTL_DESCR("Neighbor discovery prune interval"),
|
|
NULL, 0, &nd6_prune, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_ND6_PRUNE, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "nd6_delay",
|
|
SYSCTL_DESCR("First probe delay time"),
|
|
NULL, 0, &nd6_delay, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_ND6_DELAY, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "nd6_umaxtries",
|
|
SYSCTL_DESCR("Number of unicast discovery attempts"),
|
|
NULL, 0, &nd6_umaxtries, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "nd6_mmaxtries",
|
|
SYSCTL_DESCR("Number of multicast discovery attempts"),
|
|
NULL, 0, &nd6_mmaxtries, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "nd6_useloopback",
|
|
SYSCTL_DESCR("Use loopback interface for local traffic"),
|
|
NULL, 0, &nd6_useloopback, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL);
|
|
#if 0 /* obsoleted */
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "nd6_proxyall", NULL,
|
|
NULL, 0, &nd6_proxyall, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_ND6_PROXYALL, CTL_EOL);
|
|
#endif
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "nodeinfo",
|
|
SYSCTL_DESCR("Respond to node information requests"),
|
|
NULL, 0, &icmp6_nodeinfo, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_NODEINFO, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "errppslimit",
|
|
SYSCTL_DESCR("Maximum ICMP errors sent per second"),
|
|
NULL, 0, &icmp6errppslim, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_ERRPPSLIMIT, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "nd6_maxnudhint",
|
|
SYSCTL_DESCR("Maximum neighbor unreachable hint count"),
|
|
NULL, 0, &nd6_maxnudhint, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "mtudisc_hiwat",
|
|
SYSCTL_DESCR("Low mark on MTU Discovery route timers"),
|
|
NULL, 0, &icmp6_mtudisc_hiwat, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "mtudisc_lowat",
|
|
SYSCTL_DESCR("Low mark on MTU Discovery route timers"),
|
|
NULL, 0, &icmp6_mtudisc_lowat, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "nd6_debug",
|
|
SYSCTL_DESCR("Enable neighbor discovery debug output"),
|
|
NULL, 0, &nd6_debug, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_ND6_DEBUG, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_STRUCT, "nd6_drlist",
|
|
SYSCTL_DESCR("Default router list"),
|
|
sysctl_net_inet6_icmp6_nd6, 0, NULL, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_ND6_DRLIST, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_STRUCT, "nd6_prlist",
|
|
SYSCTL_DESCR("Prefix list"),
|
|
sysctl_net_inet6_icmp6_nd6, 0, NULL, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_ND6_PRLIST, CTL_EOL);
|
|
sysctl_createv(clog, 0, NULL, NULL,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "maxqueuelen",
|
|
SYSCTL_DESCR("max packet queue len for a unresolved ND"),
|
|
NULL, 1, &nd6_maxqueuelen, 0,
|
|
CTL_NET, PF_INET6, IPPROTO_ICMPV6,
|
|
ICMPV6CTL_ND6_MAXQLEN, CTL_EOL);
|
|
}
|
|
|
|
void
|
|
icmp6_statinc(u_int stat)
|
|
{
|
|
|
|
KASSERT(stat < ICMP6_NSTATS);
|
|
ICMP6_STATINC(stat);
|
|
}
|