xref: /freebsd/sys/netinet6/icmp6.c (revision cf377af6e2b1950d662c6f88a2caf1d5717f99a3)
1caf43b02SWarner Losh /*-
251369649SPedro F. Giffuni  * SPDX-License-Identifier: BSD-3-Clause
351369649SPedro F. Giffuni  *
482cd038dSYoshinobu Inoue  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
582cd038dSYoshinobu Inoue  * All rights reserved.
682cd038dSYoshinobu Inoue  *
782cd038dSYoshinobu Inoue  * Redistribution and use in source and binary forms, with or without
882cd038dSYoshinobu Inoue  * modification, are permitted provided that the following conditions
982cd038dSYoshinobu Inoue  * are met:
1082cd038dSYoshinobu Inoue  * 1. Redistributions of source code must retain the above copyright
1182cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer.
1282cd038dSYoshinobu Inoue  * 2. Redistributions in binary form must reproduce the above copyright
1382cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer in the
1482cd038dSYoshinobu Inoue  *    documentation and/or other materials provided with the distribution.
1582cd038dSYoshinobu Inoue  * 3. Neither the name of the project nor the names of its contributors
1682cd038dSYoshinobu Inoue  *    may be used to endorse or promote products derived from this software
1782cd038dSYoshinobu Inoue  *    without specific prior written permission.
1882cd038dSYoshinobu Inoue  *
1982cd038dSYoshinobu Inoue  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
2082cd038dSYoshinobu Inoue  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2182cd038dSYoshinobu Inoue  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2282cd038dSYoshinobu Inoue  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
2382cd038dSYoshinobu Inoue  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2482cd038dSYoshinobu Inoue  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2582cd038dSYoshinobu Inoue  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2682cd038dSYoshinobu Inoue  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2782cd038dSYoshinobu Inoue  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2882cd038dSYoshinobu Inoue  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2982cd038dSYoshinobu Inoue  * SUCH DAMAGE.
30b48287a3SDavid E. O'Brien  *
31b48287a3SDavid E. O'Brien  *	$KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $
3282cd038dSYoshinobu Inoue  */
3382cd038dSYoshinobu Inoue 
34caf43b02SWarner Losh /*-
3582cd038dSYoshinobu Inoue  * Copyright (c) 1982, 1986, 1988, 1993
3682cd038dSYoshinobu Inoue  *	The Regents of the University of California.  All rights reserved.
3782cd038dSYoshinobu Inoue  *
3882cd038dSYoshinobu Inoue  * Redistribution and use in source and binary forms, with or without
3982cd038dSYoshinobu Inoue  * modification, are permitted provided that the following conditions
4082cd038dSYoshinobu Inoue  * are met:
4182cd038dSYoshinobu Inoue  * 1. Redistributions of source code must retain the above copyright
4282cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer.
4382cd038dSYoshinobu Inoue  * 2. Redistributions in binary form must reproduce the above copyright
4482cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer in the
4582cd038dSYoshinobu Inoue  *    documentation and/or other materials provided with the distribution.
46fbbd9655SWarner Losh  * 3. Neither the name of the University nor the names of its contributors
4782cd038dSYoshinobu Inoue  *    may be used to endorse or promote products derived from this software
4882cd038dSYoshinobu Inoue  *    without specific prior written permission.
4982cd038dSYoshinobu Inoue  *
5082cd038dSYoshinobu Inoue  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
5182cd038dSYoshinobu Inoue  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
5282cd038dSYoshinobu Inoue  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
5382cd038dSYoshinobu Inoue  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
5482cd038dSYoshinobu Inoue  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
5582cd038dSYoshinobu Inoue  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
5682cd038dSYoshinobu Inoue  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
5782cd038dSYoshinobu Inoue  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
5882cd038dSYoshinobu Inoue  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
5982cd038dSYoshinobu Inoue  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
6082cd038dSYoshinobu Inoue  * SUCH DAMAGE.
6182cd038dSYoshinobu Inoue  *
6282cd038dSYoshinobu Inoue  *	@(#)ip_icmp.c	8.2 (Berkeley) 1/4/94
6382cd038dSYoshinobu Inoue  */
6482cd038dSYoshinobu Inoue 
65b48287a3SDavid E. O'Brien #include <sys/cdefs.h>
66b48287a3SDavid E. O'Brien __FBSDID("$FreeBSD$");
67b48287a3SDavid E. O'Brien 
68f0cace5dSRobert Watson #define	MBUF_PRIVATE	/* XXXRW: Optimisation tries to avoid M_EXT mbufs */
69f0cace5dSRobert Watson 
70686cdd19SJun-ichiro itojun Hagino #include "opt_inet.h"
71686cdd19SJun-ichiro itojun Hagino #include "opt_inet6.h"
7282cd038dSYoshinobu Inoue 
7382cd038dSYoshinobu Inoue #include <sys/param.h>
74960ed29cSSeigo Tanimura #include <sys/domain.h>
7576ca6f88SJamie Gritton #include <sys/jail.h>
76960ed29cSSeigo Tanimura #include <sys/kernel.h>
77960ed29cSSeigo Tanimura #include <sys/lock.h>
7833841545SHajimu UMEMOTO #include <sys/malloc.h>
7982cd038dSYoshinobu Inoue #include <sys/mbuf.h>
80530c0060SRobert Watson #include <sys/proc.h>
8182cd038dSYoshinobu Inoue #include <sys/protosw.h>
82960ed29cSSeigo Tanimura #include <sys/signalvar.h>
8382cd038dSYoshinobu Inoue #include <sys/socket.h>
8482cd038dSYoshinobu Inoue #include <sys/socketvar.h>
85960ed29cSSeigo Tanimura #include <sys/sx.h>
8682cd038dSYoshinobu Inoue #include <sys/syslog.h>
87960ed29cSSeigo Tanimura #include <sys/systm.h>
88960ed29cSSeigo Tanimura #include <sys/time.h>
8982cd038dSYoshinobu Inoue 
9082cd038dSYoshinobu Inoue #include <net/if.h>
9176039bc8SGleb Smirnoff #include <net/if_var.h>
9282cd038dSYoshinobu Inoue #include <net/if_dl.h>
936e6b3f7cSQing Li #include <net/if_llatbl.h>
9482cd038dSYoshinobu Inoue #include <net/if_types.h>
95960ed29cSSeigo Tanimura #include <net/route.h>
964b79449eSBjoern A. Zeeb #include <net/vnet.h>
9782cd038dSYoshinobu Inoue 
9882cd038dSYoshinobu Inoue #include <netinet/in.h>
99960ed29cSSeigo Tanimura #include <netinet/in_pcb.h>
10082cd038dSYoshinobu Inoue #include <netinet/in_var.h>
101686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h>
102686cdd19SJun-ichiro itojun Hagino #include <netinet/icmp6.h>
10397d8d152SAndre Oppermann #include <netinet/tcp_var.h>
1044b79449eSBjoern A. Zeeb 
1059977be4aSAlexander V. Chernikov #include <netinet6/in6_fib.h>
10682cd038dSYoshinobu Inoue #include <netinet6/in6_ifattach.h>
107960ed29cSSeigo Tanimura #include <netinet6/in6_pcb.h>
10882cd038dSYoshinobu Inoue #include <netinet6/ip6protosw.h>
109960ed29cSSeigo Tanimura #include <netinet6/ip6_var.h>
110a1f7e5f8SHajimu UMEMOTO #include <netinet6/scope6_var.h>
111960ed29cSSeigo Tanimura #include <netinet6/mld6_var.h>
112960ed29cSSeigo Tanimura #include <netinet6/nd6.h>
1131db8d1f8SAna Kukec #include <netinet6/send.h>
11482cd038dSYoshinobu Inoue 
11582cd038dSYoshinobu Inoue extern struct domain inet6domain;
11697021c24SMarko Zec 
117a786f679SAndrey V. Elsukov VNET_PCPUSTAT_DEFINE(struct icmp6stat, icmp6stat);
118a786f679SAndrey V. Elsukov VNET_PCPUSTAT_SYSINIT(icmp6stat);
119a786f679SAndrey V. Elsukov 
120a786f679SAndrey V. Elsukov #ifdef VIMAGE
121a786f679SAndrey V. Elsukov VNET_PCPUSTAT_SYSUNINIT(icmp6stat);
122a786f679SAndrey V. Elsukov #endif /* VIMAGE */
12382cea7e6SBjoern A. Zeeb 
124eddfbb76SRobert Watson VNET_DECLARE(struct inpcbinfo, ripcbinfo);
125eddfbb76SRobert Watson VNET_DECLARE(struct inpcbhead, ripcb);
126eddfbb76SRobert Watson VNET_DECLARE(int, icmp6errppslim);
1275f901c92SAndrew Turner VNET_DEFINE_STATIC(int, icmp6errpps_count) = 0;
1285f901c92SAndrew Turner VNET_DEFINE_STATIC(struct timeval, icmp6errppslim_last);
129eddfbb76SRobert Watson VNET_DECLARE(int, icmp6_nodeinfo);
13082cd038dSYoshinobu Inoue 
1311e77c105SRobert Watson #define	V_ripcbinfo			VNET(ripcbinfo)
1321e77c105SRobert Watson #define	V_ripcb				VNET(ripcb)
1331e77c105SRobert Watson #define	V_icmp6errppslim		VNET(icmp6errppslim)
1341e77c105SRobert Watson #define	V_icmp6errpps_count		VNET(icmp6errpps_count)
1351e77c105SRobert Watson #define	V_icmp6errppslim_last		VNET(icmp6errppslim_last)
13682cea7e6SBjoern A. Zeeb #define	V_icmp6_nodeinfo		VNET(icmp6_nodeinfo)
13744e33a07SMarko Zec 
13849dc650cSAndrey V. Elsukov static void icmp6_errcount(int, int);
1399233d8f3SDavid E. O'Brien static int icmp6_rip6_input(struct mbuf **, int);
1409233d8f3SDavid E. O'Brien static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
1416f56329aSXin LI static const char *icmp6_redirect_diag(struct in6_addr *,
1426f56329aSXin LI 	struct in6_addr *, struct in6_addr *);
1437460ef5dSHiroki Sato static struct mbuf *ni6_input(struct mbuf *, int, struct prison *);
1449233d8f3SDavid E. O'Brien static struct mbuf *ni6_nametodns(const char *, int, int);
1459233d8f3SDavid E. O'Brien static int ni6_dnsmatch(const char *, int, const char *, int);
1466f56329aSXin LI static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *,
1476f56329aSXin LI 			  struct ifnet **, struct in6_addr *);
1486f56329aSXin LI static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
1496f56329aSXin LI 				struct ifnet *, int);
1509233d8f3SDavid E. O'Brien static int icmp6_notify_error(struct mbuf **, int, int, int);
15182cd038dSYoshinobu Inoue 
152315e3e38SRobert Watson /*
153315e3e38SRobert Watson  * Kernel module interface for updating icmp6stat.  The argument is an index
154315e3e38SRobert Watson  * into icmp6stat treated as an array of u_quad_t.  While this encodes the
155315e3e38SRobert Watson  * general layout of icmp6stat into the caller, it doesn't encode its
156315e3e38SRobert Watson  * location, so that future changes to add, for example, per-CPU stats
157315e3e38SRobert Watson  * support won't cause binary compatibility problems for kernel modules.
158315e3e38SRobert Watson  */
159315e3e38SRobert Watson void
160315e3e38SRobert Watson kmod_icmp6stat_inc(int statnum)
161315e3e38SRobert Watson {
162315e3e38SRobert Watson 
163a786f679SAndrey V. Elsukov 	counter_u64_add(VNET(icmp6stat)[statnum], 1);
164315e3e38SRobert Watson }
165315e3e38SRobert Watson 
166686cdd19SJun-ichiro itojun Hagino static void
16749dc650cSAndrey V. Elsukov icmp6_errcount(int type, int code)
168686cdd19SJun-ichiro itojun Hagino {
169686cdd19SJun-ichiro itojun Hagino 	switch (type) {
170686cdd19SJun-ichiro itojun Hagino 	case ICMP6_DST_UNREACH:
171686cdd19SJun-ichiro itojun Hagino 		switch (code) {
172686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_NOROUTE:
17349dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_odst_unreach_noroute);
174686cdd19SJun-ichiro itojun Hagino 			return;
175686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_ADMIN:
17649dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_odst_unreach_admin);
177686cdd19SJun-ichiro itojun Hagino 			return;
178686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_BEYONDSCOPE:
17949dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_odst_unreach_beyondscope);
180686cdd19SJun-ichiro itojun Hagino 			return;
181686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_ADDR:
18249dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_odst_unreach_addr);
183686cdd19SJun-ichiro itojun Hagino 			return;
184686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_NOPORT:
18549dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_odst_unreach_noport);
186686cdd19SJun-ichiro itojun Hagino 			return;
187686cdd19SJun-ichiro itojun Hagino 		}
188686cdd19SJun-ichiro itojun Hagino 		break;
189686cdd19SJun-ichiro itojun Hagino 	case ICMP6_PACKET_TOO_BIG:
19049dc650cSAndrey V. Elsukov 		ICMP6STAT_INC(icp6s_opacket_too_big);
191686cdd19SJun-ichiro itojun Hagino 		return;
192686cdd19SJun-ichiro itojun Hagino 	case ICMP6_TIME_EXCEEDED:
193686cdd19SJun-ichiro itojun Hagino 		switch (code) {
194686cdd19SJun-ichiro itojun Hagino 		case ICMP6_TIME_EXCEED_TRANSIT:
19549dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_otime_exceed_transit);
196686cdd19SJun-ichiro itojun Hagino 			return;
197686cdd19SJun-ichiro itojun Hagino 		case ICMP6_TIME_EXCEED_REASSEMBLY:
19849dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_otime_exceed_reassembly);
199686cdd19SJun-ichiro itojun Hagino 			return;
200686cdd19SJun-ichiro itojun Hagino 		}
201686cdd19SJun-ichiro itojun Hagino 		break;
202686cdd19SJun-ichiro itojun Hagino 	case ICMP6_PARAM_PROB:
203686cdd19SJun-ichiro itojun Hagino 		switch (code) {
204686cdd19SJun-ichiro itojun Hagino 		case ICMP6_PARAMPROB_HEADER:
20549dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_oparamprob_header);
206686cdd19SJun-ichiro itojun Hagino 			return;
207686cdd19SJun-ichiro itojun Hagino 		case ICMP6_PARAMPROB_NEXTHEADER:
20849dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_oparamprob_nextheader);
209686cdd19SJun-ichiro itojun Hagino 			return;
210686cdd19SJun-ichiro itojun Hagino 		case ICMP6_PARAMPROB_OPTION:
21149dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_oparamprob_option);
212686cdd19SJun-ichiro itojun Hagino 			return;
213686cdd19SJun-ichiro itojun Hagino 		}
214686cdd19SJun-ichiro itojun Hagino 		break;
215686cdd19SJun-ichiro itojun Hagino 	case ND_REDIRECT:
21649dc650cSAndrey V. Elsukov 		ICMP6STAT_INC(icp6s_oredirect);
217686cdd19SJun-ichiro itojun Hagino 		return;
218686cdd19SJun-ichiro itojun Hagino 	}
21949dc650cSAndrey V. Elsukov 	ICMP6STAT_INC(icp6s_ounknown);
220686cdd19SJun-ichiro itojun Hagino }
221686cdd19SJun-ichiro itojun Hagino 
22282cd038dSYoshinobu Inoue /*
223a1f7e5f8SHajimu UMEMOTO  * A wrapper function for icmp6_error() necessary when the erroneous packet
224a1f7e5f8SHajimu UMEMOTO  * may not contain enough scope zone information.
225a1f7e5f8SHajimu UMEMOTO  */
226a1f7e5f8SHajimu UMEMOTO void
2271272577eSXin LI icmp6_error2(struct mbuf *m, int type, int code, int param,
2281272577eSXin LI     struct ifnet *ifp)
229a1f7e5f8SHajimu UMEMOTO {
230a1f7e5f8SHajimu UMEMOTO 	struct ip6_hdr *ip6;
231a1f7e5f8SHajimu UMEMOTO 
232a1f7e5f8SHajimu UMEMOTO 	if (ifp == NULL)
233a1f7e5f8SHajimu UMEMOTO 		return;
234a1f7e5f8SHajimu UMEMOTO 
235a1f7e5f8SHajimu UMEMOTO #ifndef PULLDOWN_TEST
236a1f7e5f8SHajimu UMEMOTO 	IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
237a1f7e5f8SHajimu UMEMOTO #else
238a1f7e5f8SHajimu UMEMOTO 	if (m->m_len < sizeof(struct ip6_hdr)) {
239a1f7e5f8SHajimu UMEMOTO 		m = m_pullup(m, sizeof(struct ip6_hdr));
240a1f7e5f8SHajimu UMEMOTO 		if (m == NULL)
241a1f7e5f8SHajimu UMEMOTO 			return;
242a1f7e5f8SHajimu UMEMOTO 	}
243a1f7e5f8SHajimu UMEMOTO #endif
244a1f7e5f8SHajimu UMEMOTO 
245a1f7e5f8SHajimu UMEMOTO 	ip6 = mtod(m, struct ip6_hdr *);
246a1f7e5f8SHajimu UMEMOTO 
247a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
248a1f7e5f8SHajimu UMEMOTO 		return;
249a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
250a1f7e5f8SHajimu UMEMOTO 		return;
251a1f7e5f8SHajimu UMEMOTO 
252a1f7e5f8SHajimu UMEMOTO 	icmp6_error(m, type, code, param);
253a1f7e5f8SHajimu UMEMOTO }
254a1f7e5f8SHajimu UMEMOTO 
255a1f7e5f8SHajimu UMEMOTO /*
25682cd038dSYoshinobu Inoue  * Generate an error packet of type error in response to bad IP6 packet.
25782cd038dSYoshinobu Inoue  */
25882cd038dSYoshinobu Inoue void
2591272577eSXin LI icmp6_error(struct mbuf *m, int type, int code, int param)
26082cd038dSYoshinobu Inoue {
26182cd038dSYoshinobu Inoue 	struct ip6_hdr *oip6, *nip6;
26282cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6;
263686cdd19SJun-ichiro itojun Hagino 	u_int preplen;
26482cd038dSYoshinobu Inoue 	int off;
265686cdd19SJun-ichiro itojun Hagino 	int nxt;
26682cd038dSYoshinobu Inoue 
267e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_error);
26882cd038dSYoshinobu Inoue 
269686cdd19SJun-ichiro itojun Hagino 	/* count per-type-code statistics */
27049dc650cSAndrey V. Elsukov 	icmp6_errcount(type, code);
27182cd038dSYoshinobu Inoue 
272686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED	/*not openbsd*/
273686cdd19SJun-ichiro itojun Hagino 	if (m->m_flags & M_DECRYPTED) {
274e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_canterror);
275686cdd19SJun-ichiro itojun Hagino 		goto freeit;
276686cdd19SJun-ichiro itojun Hagino 	}
277686cdd19SJun-ichiro itojun Hagino #endif
278686cdd19SJun-ichiro itojun Hagino 
279686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
280686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
281686cdd19SJun-ichiro itojun Hagino #else
282686cdd19SJun-ichiro itojun Hagino 	if (m->m_len < sizeof(struct ip6_hdr)) {
283686cdd19SJun-ichiro itojun Hagino 		m = m_pullup(m, sizeof(struct ip6_hdr));
284686cdd19SJun-ichiro itojun Hagino 		if (m == NULL)
285686cdd19SJun-ichiro itojun Hagino 			return;
286686cdd19SJun-ichiro itojun Hagino 	}
287686cdd19SJun-ichiro itojun Hagino #endif
28882cd038dSYoshinobu Inoue 	oip6 = mtod(m, struct ip6_hdr *);
28982cd038dSYoshinobu Inoue 
29082cd038dSYoshinobu Inoue 	/*
291f95d4633SHajimu UMEMOTO 	 * If the destination address of the erroneous packet is a multicast
292f95d4633SHajimu UMEMOTO 	 * address, or the packet was sent using link-layer multicast,
293f95d4633SHajimu UMEMOTO 	 * we should basically suppress sending an error (RFC 2463, Section
294f95d4633SHajimu UMEMOTO 	 * 2.4).
295f95d4633SHajimu UMEMOTO 	 * We have two exceptions (the item e.2 in that section):
2961767c520SBjoern A. Zeeb 	 * - the Packet Too Big message can be sent for path MTU discovery.
297f95d4633SHajimu UMEMOTO 	 * - the Parameter Problem Message that can be allowed an icmp6 error
298f95d4633SHajimu UMEMOTO 	 *   in the option type field.  This check has been done in
299f95d4633SHajimu UMEMOTO 	 *   ip6_unknown_opt(), so we can just check the type and code.
30082cd038dSYoshinobu Inoue 	 */
30182cd038dSYoshinobu Inoue 	if ((m->m_flags & (M_BCAST|M_MCAST) ||
30282cd038dSYoshinobu Inoue 	     IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
30382cd038dSYoshinobu Inoue 	    (type != ICMP6_PACKET_TOO_BIG &&
30482cd038dSYoshinobu Inoue 	     (type != ICMP6_PARAM_PROB ||
30582cd038dSYoshinobu Inoue 	      code != ICMP6_PARAMPROB_OPTION)))
30682cd038dSYoshinobu Inoue 		goto freeit;
30782cd038dSYoshinobu Inoue 
308f95d4633SHajimu UMEMOTO 	/*
309f95d4633SHajimu UMEMOTO 	 * RFC 2463, 2.4 (e.5): source address check.
310f95d4633SHajimu UMEMOTO 	 * XXX: the case of anycast source?
311f95d4633SHajimu UMEMOTO 	 */
31282cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
31382cd038dSYoshinobu Inoue 	    IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
31482cd038dSYoshinobu Inoue 		goto freeit;
31582cd038dSYoshinobu Inoue 
31682cd038dSYoshinobu Inoue 	/*
317686cdd19SJun-ichiro itojun Hagino 	 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
318686cdd19SJun-ichiro itojun Hagino 	 * don't do it.
31982cd038dSYoshinobu Inoue 	 */
320686cdd19SJun-ichiro itojun Hagino 	nxt = -1;
321686cdd19SJun-ichiro itojun Hagino 	off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
322686cdd19SJun-ichiro itojun Hagino 	if (off >= 0 && nxt == IPPROTO_ICMPV6) {
32382cd038dSYoshinobu Inoue 		struct icmp6_hdr *icp;
32482cd038dSYoshinobu Inoue 
325686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
32682cd038dSYoshinobu Inoue 		IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
32782cd038dSYoshinobu Inoue 		icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
328686cdd19SJun-ichiro itojun Hagino #else
329686cdd19SJun-ichiro itojun Hagino 		IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
330686cdd19SJun-ichiro itojun Hagino 			sizeof(*icp));
331686cdd19SJun-ichiro itojun Hagino 		if (icp == NULL) {
332e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_tooshort);
333686cdd19SJun-ichiro itojun Hagino 			return;
334686cdd19SJun-ichiro itojun Hagino 		}
335686cdd19SJun-ichiro itojun Hagino #endif
336686cdd19SJun-ichiro itojun Hagino 		if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
337686cdd19SJun-ichiro itojun Hagino 		    icp->icmp6_type == ND_REDIRECT) {
33882cd038dSYoshinobu Inoue 			/*
33982cd038dSYoshinobu Inoue 			 * ICMPv6 error
34082cd038dSYoshinobu Inoue 			 * Special case: for redirect (which is
34182cd038dSYoshinobu Inoue 			 * informational) we must not send icmp6 error.
34282cd038dSYoshinobu Inoue 			 */
343e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_canterror);
34482cd038dSYoshinobu Inoue 			goto freeit;
34582cd038dSYoshinobu Inoue 		} else {
346686cdd19SJun-ichiro itojun Hagino 			/* ICMPv6 informational - send the error */
34782cd038dSYoshinobu Inoue 		}
348686cdd19SJun-ichiro itojun Hagino 	} else {
349686cdd19SJun-ichiro itojun Hagino 		/* non-ICMPv6 - send the error */
35082cd038dSYoshinobu Inoue 	}
35182cd038dSYoshinobu Inoue 
35282cd038dSYoshinobu Inoue 	oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
35382cd038dSYoshinobu Inoue 
35482cd038dSYoshinobu Inoue 	/* Finally, do rate limitation check. */
35582cd038dSYoshinobu Inoue 	if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
356e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_toofreq);
35782cd038dSYoshinobu Inoue 		goto freeit;
35882cd038dSYoshinobu Inoue 	}
35982cd038dSYoshinobu Inoue 
36082cd038dSYoshinobu Inoue 	/*
36182cd038dSYoshinobu Inoue 	 * OK, ICMP6 can be generated.
36282cd038dSYoshinobu Inoue 	 */
36382cd038dSYoshinobu Inoue 
36482cd038dSYoshinobu Inoue 	if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
36582cd038dSYoshinobu Inoue 		m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
36682cd038dSYoshinobu Inoue 
367686cdd19SJun-ichiro itojun Hagino 	preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
368eb1b1807SGleb Smirnoff 	M_PREPEND(m, preplen, M_NOWAIT);	/* FIB is also copied over. */
36982cd038dSYoshinobu Inoue 	if (m == NULL) {
37033841545SHajimu UMEMOTO 		nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
37182cd038dSYoshinobu Inoue 		return;
37282cd038dSYoshinobu Inoue 	}
37382cd038dSYoshinobu Inoue 
37482cd038dSYoshinobu Inoue 	nip6 = mtod(m, struct ip6_hdr *);
37582cd038dSYoshinobu Inoue 	nip6->ip6_src  = oip6->ip6_src;
37682cd038dSYoshinobu Inoue 	nip6->ip6_dst  = oip6->ip6_dst;
37782cd038dSYoshinobu Inoue 
3789a4f9608SHajimu UMEMOTO 	in6_clearscope(&oip6->ip6_src);
3799a4f9608SHajimu UMEMOTO 	in6_clearscope(&oip6->ip6_dst);
38082cd038dSYoshinobu Inoue 
38182cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)(nip6 + 1);
38282cd038dSYoshinobu Inoue 	icmp6->icmp6_type = type;
38382cd038dSYoshinobu Inoue 	icmp6->icmp6_code = code;
38482cd038dSYoshinobu Inoue 	icmp6->icmp6_pptr = htonl((u_int32_t)param);
38582cd038dSYoshinobu Inoue 
386e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_outhist[type]);
38782cd038dSYoshinobu Inoue 	icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
388686cdd19SJun-ichiro itojun Hagino 
389686cdd19SJun-ichiro itojun Hagino 	return;
390686cdd19SJun-ichiro itojun Hagino 
391686cdd19SJun-ichiro itojun Hagino   freeit:
392686cdd19SJun-ichiro itojun Hagino 	/*
393cd0fdcf7SHajimu UMEMOTO 	 * If we can't tell whether or not we can generate ICMP6, free it.
394686cdd19SJun-ichiro itojun Hagino 	 */
395686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
39682cd038dSYoshinobu Inoue }
39782cd038dSYoshinobu Inoue 
39882cd038dSYoshinobu Inoue /*
39982cd038dSYoshinobu Inoue  * Process a received ICMP6 message.
40082cd038dSYoshinobu Inoue  */
40182cd038dSYoshinobu Inoue int
4021272577eSXin LI icmp6_input(struct mbuf **mp, int *offp, int proto)
40382cd038dSYoshinobu Inoue {
404503f4e47SBjoern A. Zeeb 	struct mbuf *m, *n;
40529dc7bc6SBruce M Simpson 	struct ifnet *ifp;
40682cd038dSYoshinobu Inoue 	struct ip6_hdr *ip6, *nip6;
40782cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6, *nicmp6;
4081d54aa3bSBjoern A. Zeeb 	char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
409503f4e47SBjoern A. Zeeb 	int code, error, icmp6len, ip6len, noff, off, sum;
41082cd038dSYoshinobu Inoue 
411503f4e47SBjoern A. Zeeb 	m = *mp;
412503f4e47SBjoern A. Zeeb 	off = *offp;
41329dc7bc6SBruce M Simpson 
414686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
41582cd038dSYoshinobu Inoue 	IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
41682cd038dSYoshinobu Inoue 	/* m might change if M_LOOP.  So, call mtod after this */
417686cdd19SJun-ichiro itojun Hagino #endif
41882cd038dSYoshinobu Inoue 
41982cd038dSYoshinobu Inoue 	/*
42082cd038dSYoshinobu Inoue 	 * Locate icmp6 structure in mbuf, and check
42182cd038dSYoshinobu Inoue 	 * that not corrupted and of at least minimum length
42282cd038dSYoshinobu Inoue 	 */
42382cd038dSYoshinobu Inoue 
424503f4e47SBjoern A. Zeeb 	icmp6len = m->m_pkthdr.len - off;
42582cd038dSYoshinobu Inoue 	if (icmp6len < sizeof(struct icmp6_hdr)) {
426e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
42782cd038dSYoshinobu Inoue 		goto freeit;
42882cd038dSYoshinobu Inoue 	}
42982cd038dSYoshinobu Inoue 
430503f4e47SBjoern A. Zeeb 	ip6 = mtod(m, struct ip6_hdr *);
431503f4e47SBjoern A. Zeeb 	ifp = m->m_pkthdr.rcvif;
43282cd038dSYoshinobu Inoue 	/*
43333cde130SBruce M Simpson 	 * Check multicast group membership.
43433cde130SBruce M Simpson 	 * Note: SSM filters are not applied for ICMPv6 traffic.
43533cde130SBruce M Simpson 	 */
43633cde130SBruce M Simpson 	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
43733cde130SBruce M Simpson 		struct in6_multi	*inm;
43833cde130SBruce M Simpson 
43933cde130SBruce M Simpson 		inm = in6m_lookup(ifp, &ip6->ip6_dst);
44033cde130SBruce M Simpson 		if (inm == NULL) {
44133cde130SBruce M Simpson 			IP6STAT_INC(ip6s_notmember);
44233cde130SBruce M Simpson 			in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
44333cde130SBruce M Simpson 			goto freeit;
44433cde130SBruce M Simpson 		}
44533cde130SBruce M Simpson 	}
44633cde130SBruce M Simpson 
447503f4e47SBjoern A. Zeeb 	/* Calculate the checksum. */
448686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
44982cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
450686cdd19SJun-ichiro itojun Hagino #else
451686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
452686cdd19SJun-ichiro itojun Hagino 	if (icmp6 == NULL) {
453e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
454686cdd19SJun-ichiro itojun Hagino 		return IPPROTO_DONE;
455686cdd19SJun-ichiro itojun Hagino 	}
456686cdd19SJun-ichiro itojun Hagino #endif
45782cd038dSYoshinobu Inoue 	code = icmp6->icmp6_code;
45882cd038dSYoshinobu Inoue 
45982cd038dSYoshinobu Inoue 	if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
46033841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
46182cd038dSYoshinobu Inoue 		    "ICMP6 checksum error(%d|%x) %s\n",
4621d54aa3bSBjoern A. Zeeb 		    icmp6->icmp6_type, sum,
4631d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6bufs, &ip6->ip6_src)));
464e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_checksum);
46582cd038dSYoshinobu Inoue 		goto freeit;
46682cd038dSYoshinobu Inoue 	}
46782cd038dSYoshinobu Inoue 
468e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]);
46929dc7bc6SBruce M Simpson 	icmp6_ifstat_inc(ifp, ifs6_in_msg);
47082cd038dSYoshinobu Inoue 	if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
47129dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_error);
47282cd038dSYoshinobu Inoue 
473503f4e47SBjoern A. Zeeb 	ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
47482cd038dSYoshinobu Inoue 	switch (icmp6->icmp6_type) {
47582cd038dSYoshinobu Inoue 	case ICMP6_DST_UNREACH:
47629dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_dstunreach);
47782cd038dSYoshinobu Inoue 		switch (code) {
47882cd038dSYoshinobu Inoue 		case ICMP6_DST_UNREACH_NOROUTE:
479d4c22202SAndrew Gallatin 		case ICMP6_DST_UNREACH_ADDR:	/* PRC_HOSTDEAD is a DOS */
48082cd038dSYoshinobu Inoue 			code = PRC_UNREACH_NET;
48182cd038dSYoshinobu Inoue 			break;
48282cd038dSYoshinobu Inoue 		case ICMP6_DST_UNREACH_ADMIN:
48329dc7bc6SBruce M Simpson 			icmp6_ifstat_inc(ifp, ifs6_in_adminprohib);
4843e146575SMichael Tuexen 			code = PRC_UNREACH_ADMIN_PROHIB;
48582cd038dSYoshinobu Inoue 			break;
486686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_BEYONDSCOPE:
487686cdd19SJun-ichiro itojun Hagino 			/* I mean "source address was incorrect." */
488686cdd19SJun-ichiro itojun Hagino 			code = PRC_PARAMPROB;
489686cdd19SJun-ichiro itojun Hagino 			break;
49082cd038dSYoshinobu Inoue 		case ICMP6_DST_UNREACH_NOPORT:
49182cd038dSYoshinobu Inoue 			code = PRC_UNREACH_PORT;
49282cd038dSYoshinobu Inoue 			break;
49382cd038dSYoshinobu Inoue 		default:
49482cd038dSYoshinobu Inoue 			goto badcode;
49582cd038dSYoshinobu Inoue 		}
49682cd038dSYoshinobu Inoue 		goto deliver;
49782cd038dSYoshinobu Inoue 		break;
49882cd038dSYoshinobu Inoue 
49982cd038dSYoshinobu Inoue 	case ICMP6_PACKET_TOO_BIG:
50029dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig);
50182cd038dSYoshinobu Inoue 
502aaff9927SHajimu UMEMOTO 		/* validation is made in icmp6_mtudisc_update */
503aaff9927SHajimu UMEMOTO 
50482cd038dSYoshinobu Inoue 		code = PRC_MSGSIZE;
50582cd038dSYoshinobu Inoue 
506686cdd19SJun-ichiro itojun Hagino 		/*
507686cdd19SJun-ichiro itojun Hagino 		 * Updating the path MTU will be done after examining
508686cdd19SJun-ichiro itojun Hagino 		 * intermediate extension headers.
509686cdd19SJun-ichiro itojun Hagino 		 */
51082cd038dSYoshinobu Inoue 		goto deliver;
51182cd038dSYoshinobu Inoue 		break;
51282cd038dSYoshinobu Inoue 
51382cd038dSYoshinobu Inoue 	case ICMP6_TIME_EXCEEDED:
51429dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_timeexceed);
51582cd038dSYoshinobu Inoue 		switch (code) {
51682cd038dSYoshinobu Inoue 		case ICMP6_TIME_EXCEED_TRANSIT:
5172ce62dceSSUZUKI Shinsuke 			code = PRC_TIMXCEED_INTRANS;
5182ce62dceSSUZUKI Shinsuke 			break;
51982cd038dSYoshinobu Inoue 		case ICMP6_TIME_EXCEED_REASSEMBLY:
5202ce62dceSSUZUKI Shinsuke 			code = PRC_TIMXCEED_REASS;
52182cd038dSYoshinobu Inoue 			break;
52282cd038dSYoshinobu Inoue 		default:
52382cd038dSYoshinobu Inoue 			goto badcode;
52482cd038dSYoshinobu Inoue 		}
52582cd038dSYoshinobu Inoue 		goto deliver;
52682cd038dSYoshinobu Inoue 		break;
52782cd038dSYoshinobu Inoue 
52882cd038dSYoshinobu Inoue 	case ICMP6_PARAM_PROB:
52929dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_paramprob);
53082cd038dSYoshinobu Inoue 		switch (code) {
53182cd038dSYoshinobu Inoue 		case ICMP6_PARAMPROB_NEXTHEADER:
53282cd038dSYoshinobu Inoue 			code = PRC_UNREACH_PROTOCOL;
53382cd038dSYoshinobu Inoue 			break;
53482cd038dSYoshinobu Inoue 		case ICMP6_PARAMPROB_HEADER:
53582cd038dSYoshinobu Inoue 		case ICMP6_PARAMPROB_OPTION:
53682cd038dSYoshinobu Inoue 			code = PRC_PARAMPROB;
53782cd038dSYoshinobu Inoue 			break;
53882cd038dSYoshinobu Inoue 		default:
53982cd038dSYoshinobu Inoue 			goto badcode;
54082cd038dSYoshinobu Inoue 		}
54182cd038dSYoshinobu Inoue 		goto deliver;
54282cd038dSYoshinobu Inoue 		break;
54382cd038dSYoshinobu Inoue 
54482cd038dSYoshinobu Inoue 	case ICMP6_ECHO_REQUEST:
54529dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_echo);
54682cd038dSYoshinobu Inoue 		if (code != 0)
54782cd038dSYoshinobu Inoue 			goto badcode;
548c3bef61eSKevin Lo 		if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
54982cd038dSYoshinobu Inoue 			/* Give up remote */
55082cd038dSYoshinobu Inoue 			break;
55182cd038dSYoshinobu Inoue 		}
552f0cace5dSRobert Watson 		if (!M_WRITABLE(n)
553686cdd19SJun-ichiro itojun Hagino 		 || n->m_len < off + sizeof(struct icmp6_hdr)) {
55482cd038dSYoshinobu Inoue 			struct mbuf *n0 = n;
5552268ca47SSam Leffler 			int n0len;
55682cd038dSYoshinobu Inoue 
55710e5acc3SGleb Smirnoff 			CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) <= MHLEN);
5587b07d1beSGleb Smirnoff 			n = m_gethdr(M_NOWAIT, n0->m_type);
55982cd038dSYoshinobu Inoue 			if (n == NULL) {
56082cd038dSYoshinobu Inoue 				/* Give up remote */
56182cd038dSYoshinobu Inoue 				m_freem(n0);
56282cd038dSYoshinobu Inoue 				break;
56382cd038dSYoshinobu Inoue 			}
56410e5acc3SGleb Smirnoff 
56510e5acc3SGleb Smirnoff 			m_move_pkthdr(n, n0);	/* FIB copied. */
56610e5acc3SGleb Smirnoff 			n0len = n0->m_pkthdr.len;	/* save for use below */
56782cd038dSYoshinobu Inoue 			/*
56882cd038dSYoshinobu Inoue 			 * Copy IPv6 and ICMPv6 only.
56982cd038dSYoshinobu Inoue 			 */
57082cd038dSYoshinobu Inoue 			nip6 = mtod(n, struct ip6_hdr *);
57182cd038dSYoshinobu Inoue 			bcopy(ip6, nip6, sizeof(struct ip6_hdr));
57282cd038dSYoshinobu Inoue 			nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
57382cd038dSYoshinobu Inoue 			bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
57482cd038dSYoshinobu Inoue 			noff = sizeof(struct ip6_hdr);
5752268ca47SSam Leffler 			/* new mbuf contains only ipv6+icmpv6 headers */
5762268ca47SSam Leffler 			n->m_len = noff + sizeof(struct icmp6_hdr);
577686cdd19SJun-ichiro itojun Hagino 			/*
578686cdd19SJun-ichiro itojun Hagino 			 * Adjust mbuf.  ip6_plen will be adjusted in
579686cdd19SJun-ichiro itojun Hagino 			 * ip6_output().
580686cdd19SJun-ichiro itojun Hagino 			 */
581686cdd19SJun-ichiro itojun Hagino 			m_adj(n0, off + sizeof(struct icmp6_hdr));
5822268ca47SSam Leffler 			/* recalculate complete packet size */
5832268ca47SSam Leffler 			n->m_pkthdr.len = n0len + (noff - off);
584686cdd19SJun-ichiro itojun Hagino 			n->m_next = n0;
58582cd038dSYoshinobu Inoue 		} else {
5866a550ab3SHajimu UMEMOTO 			IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
5876a550ab3SHajimu UMEMOTO 			    sizeof(*nicmp6));
58882cd038dSYoshinobu Inoue 			noff = off;
58982cd038dSYoshinobu Inoue 		}
590fb043945SJonathan T. Looney 		if (n) {
59182cd038dSYoshinobu Inoue 			nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
59282cd038dSYoshinobu Inoue 			nicmp6->icmp6_code = 0;
593e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_reflect);
594e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]);
59582cd038dSYoshinobu Inoue 			icmp6_reflect(n, noff);
59682cd038dSYoshinobu Inoue 		}
59782cd038dSYoshinobu Inoue 		break;
59882cd038dSYoshinobu Inoue 
59982cd038dSYoshinobu Inoue 	case ICMP6_ECHO_REPLY:
60029dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_echoreply);
60182cd038dSYoshinobu Inoue 		if (code != 0)
60282cd038dSYoshinobu Inoue 			goto badcode;
60382cd038dSYoshinobu Inoue 		break;
60482cd038dSYoshinobu Inoue 
60581170631SHajimu UMEMOTO 	case MLD_LISTENER_QUERY:
60681170631SHajimu UMEMOTO 	case MLD_LISTENER_REPORT:
60733cde130SBruce M Simpson 	case MLD_LISTENER_DONE:
60833cde130SBruce M Simpson 	case MLDV2_LISTENER_REPORT:
60933cde130SBruce M Simpson 		/*
61029dc7bc6SBruce M Simpson 		 * Drop MLD traffic which is not link-local, has a hop limit
61129dc7bc6SBruce M Simpson 		 * of greater than 1 hop, or which does not have the
61229dc7bc6SBruce M Simpson 		 * IPv6 HBH Router Alert option.
61329dc7bc6SBruce M Simpson 		 * As IPv6 HBH options are stripped in ip6_input() we must
61429dc7bc6SBruce M Simpson 		 * check an mbuf header flag.
61533cde130SBruce M Simpson 		 * XXX Should we also sanity check that these messages
61633cde130SBruce M Simpson 		 * were directed to a link-local multicast prefix?
61733cde130SBruce M Simpson 		 */
61829dc7bc6SBruce M Simpson 		if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0)
619686cdd19SJun-ichiro itojun Hagino 			goto freeit;
62033cde130SBruce M Simpson 		if (mld_input(m, off, icmp6len) != 0)
62133cde130SBruce M Simpson 			return (IPPROTO_DONE);
62282cd038dSYoshinobu Inoue 		/* m stays. */
62382cd038dSYoshinobu Inoue 		break;
62482cd038dSYoshinobu Inoue 
62582cd038dSYoshinobu Inoue 	case ICMP6_WRUREQUEST:	/* ICMP6_FQDN_QUERY */
62682cd038dSYoshinobu Inoue 	    {
62782cd038dSYoshinobu Inoue 		enum { WRU, FQDN } mode;
6287460ef5dSHiroki Sato 		struct prison *pr;
62982cd038dSYoshinobu Inoue 
630603724d3SBjoern A. Zeeb 		if (!V_icmp6_nodeinfo)
631686cdd19SJun-ichiro itojun Hagino 			break;
632686cdd19SJun-ichiro itojun Hagino 
63382cd038dSYoshinobu Inoue 		if (icmp6len == sizeof(struct icmp6_hdr) + 4)
63482cd038dSYoshinobu Inoue 			mode = WRU;
635686cdd19SJun-ichiro itojun Hagino 		else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
63682cd038dSYoshinobu Inoue 			mode = FQDN;
63782cd038dSYoshinobu Inoue 		else
63882cd038dSYoshinobu Inoue 			goto badlen;
63982cd038dSYoshinobu Inoue 
6407460ef5dSHiroki Sato 		pr = NULL;
6417460ef5dSHiroki Sato 		sx_slock(&allprison_lock);
6427460ef5dSHiroki Sato 		TAILQ_FOREACH(pr, &allprison, pr_list)
6437460ef5dSHiroki Sato 			if (pr->pr_vnet == ifp->if_vnet)
6447460ef5dSHiroki Sato 				break;
6457460ef5dSHiroki Sato 		sx_sunlock(&allprison_lock);
6467460ef5dSHiroki Sato 		if (pr == NULL)
6477460ef5dSHiroki Sato 			pr = curthread->td_ucred->cr_prison;
64882cd038dSYoshinobu Inoue 		if (mode == FQDN) {
649686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
65082cd038dSYoshinobu Inoue 			IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
65182cd038dSYoshinobu Inoue 			    IPPROTO_DONE);
652686cdd19SJun-ichiro itojun Hagino #endif
653c3bef61eSKevin Lo 			n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
654686cdd19SJun-ichiro itojun Hagino 			if (n)
6557460ef5dSHiroki Sato 				n = ni6_input(n, off, pr);
656686cdd19SJun-ichiro itojun Hagino 			/* XXX meaningless if n == NULL */
65782cd038dSYoshinobu Inoue 			noff = sizeof(struct ip6_hdr);
65882cd038dSYoshinobu Inoue 		} else {
65982cd038dSYoshinobu Inoue 			u_char *p;
66010e5acc3SGleb Smirnoff 			int maxhlen, hlen;
66182cd038dSYoshinobu Inoue 
66218706985SJINMEI Tatuya 			/*
66318706985SJINMEI Tatuya 			 * XXX: this combination of flags is pointless,
66418706985SJINMEI Tatuya 			 * but should we keep this for compatibility?
66518706985SJINMEI Tatuya 			 */
666c81c183dSMark Johnston 			if ((V_icmp6_nodeinfo & (ICMP6_NODEINFO_FQDNOK |
667c81c183dSMark Johnston 			    ICMP6_NODEINFO_TMPADDROK)) !=
668c81c183dSMark Johnston 			    (ICMP6_NODEINFO_FQDNOK | ICMP6_NODEINFO_TMPADDROK))
66933841545SHajimu UMEMOTO 				break;
67033841545SHajimu UMEMOTO 
671686cdd19SJun-ichiro itojun Hagino 			if (code != 0)
672686cdd19SJun-ichiro itojun Hagino 				goto badcode;
67310e5acc3SGleb Smirnoff 
67410e5acc3SGleb Smirnoff 			CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) + 4 <= MHLEN);
67510e5acc3SGleb Smirnoff 			n = m_gethdr(M_NOWAIT, m->m_type);
67610e5acc3SGleb Smirnoff 			if (n == NULL) {
677686cdd19SJun-ichiro itojun Hagino 				/* Give up remote */
678686cdd19SJun-ichiro itojun Hagino 				break;
679686cdd19SJun-ichiro itojun Hagino 			}
68010e5acc3SGleb Smirnoff 			if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
6819967cafcSSam Leffler 				/*
6829967cafcSSam Leffler 				 * Previous code did a blind M_COPY_PKTHDR
6839967cafcSSam Leffler 				 * and said "just for rcvif".  If true, then
6849967cafcSSam Leffler 				 * we could tolerate the dup failing (due to
6859967cafcSSam Leffler 				 * the deep copy of the tag chain).  For now
6869967cafcSSam Leffler 				 * be conservative and just fail.
6879967cafcSSam Leffler 				 */
6889967cafcSSam Leffler 				m_free(n);
6899967cafcSSam Leffler 				n = NULL;
690fb043945SJonathan T. Looney 				break;
6919967cafcSSam Leffler 			}
69282cd038dSYoshinobu Inoue 			/*
69382cd038dSYoshinobu Inoue 			 * Copy IPv6 and ICMPv6 only.
69482cd038dSYoshinobu Inoue 			 */
69582cd038dSYoshinobu Inoue 			nip6 = mtod(n, struct ip6_hdr *);
69682cd038dSYoshinobu Inoue 			bcopy(ip6, nip6, sizeof(struct ip6_hdr));
69782cd038dSYoshinobu Inoue 			nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
69882cd038dSYoshinobu Inoue 			bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
69982cd038dSYoshinobu Inoue 			p = (u_char *)(nicmp6 + 1);
70082cd038dSYoshinobu Inoue 			bzero(p, 4);
7017460ef5dSHiroki Sato 
7027460ef5dSHiroki Sato 			maxhlen = M_TRAILINGSPACE(n) -
7037460ef5dSHiroki Sato 			    (sizeof(*nip6) + sizeof(*nicmp6) + 4);
7047460ef5dSHiroki Sato 			mtx_lock(&pr->pr_mtx);
7057460ef5dSHiroki Sato 			hlen = strlen(pr->pr_hostname);
7067460ef5dSHiroki Sato 			if (maxhlen > hlen)
7077460ef5dSHiroki Sato 				maxhlen = hlen;
708c1f19219SJamie Gritton 			/* meaningless TTL */
709c1f19219SJamie Gritton 			bcopy(pr->pr_hostname, p + 4, maxhlen);
71076ca6f88SJamie Gritton 			mtx_unlock(&pr->pr_mtx);
71182cd038dSYoshinobu Inoue 			noff = sizeof(struct ip6_hdr);
71282cd038dSYoshinobu Inoue 			n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
713686cdd19SJun-ichiro itojun Hagino 				sizeof(struct icmp6_hdr) + 4 + maxhlen;
71482cd038dSYoshinobu Inoue 			nicmp6->icmp6_type = ICMP6_WRUREPLY;
71582cd038dSYoshinobu Inoue 			nicmp6->icmp6_code = 0;
71682cd038dSYoshinobu Inoue 		}
71782cd038dSYoshinobu Inoue 		if (n) {
718e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_reflect);
719e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]);
72082cd038dSYoshinobu Inoue 			icmp6_reflect(n, noff);
72182cd038dSYoshinobu Inoue 		}
72282cd038dSYoshinobu Inoue 		break;
72382cd038dSYoshinobu Inoue 	    }
72482cd038dSYoshinobu Inoue 
72582cd038dSYoshinobu Inoue 	case ICMP6_WRUREPLY:
72682cd038dSYoshinobu Inoue 		if (code != 0)
72782cd038dSYoshinobu Inoue 			goto badcode;
72882cd038dSYoshinobu Inoue 		break;
72982cd038dSYoshinobu Inoue 
73082cd038dSYoshinobu Inoue 	case ND_ROUTER_SOLICIT:
73129dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_routersolicit);
73282cd038dSYoshinobu Inoue 		if (code != 0)
73382cd038dSYoshinobu Inoue 			goto badcode;
73482cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_router_solicit))
73582cd038dSYoshinobu Inoue 			goto badlen;
7361db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
7372d12d25cSMark Johnston 			IP6_EXTHDR_CHECK(m, off, icmp6len, IPPROTO_DONE);
7382d12d25cSMark Johnston 			error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
7392d12d25cSMark Johnston 			if (error == 0) {
740686cdd19SJun-ichiro itojun Hagino 				m = NULL;
741686cdd19SJun-ichiro itojun Hagino 				goto freeit;
742686cdd19SJun-ichiro itojun Hagino 			}
7432d12d25cSMark Johnston 		}
7442d12d25cSMark Johnston 		n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
7452d12d25cSMark Johnston 		nd6_rs_input(m, off, icmp6len);
7462d12d25cSMark Johnston 		m = n;
7472d12d25cSMark Johnston 		if (m == NULL)
748e7a6db74SAna Kukec 			goto freeit;
74982cd038dSYoshinobu Inoue 		break;
75082cd038dSYoshinobu Inoue 
75182cd038dSYoshinobu Inoue 	case ND_ROUTER_ADVERT:
75229dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_routeradvert);
75382cd038dSYoshinobu Inoue 		if (code != 0)
75482cd038dSYoshinobu Inoue 			goto badcode;
75582cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_router_advert))
75682cd038dSYoshinobu Inoue 			goto badlen;
7571db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
7582d12d25cSMark Johnston 			error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
7592d12d25cSMark Johnston 			if (error == 0) {
760686cdd19SJun-ichiro itojun Hagino 				m = NULL;
761686cdd19SJun-ichiro itojun Hagino 				goto freeit;
762686cdd19SJun-ichiro itojun Hagino 			}
7632d12d25cSMark Johnston 		}
7642d12d25cSMark Johnston 		n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
7652d12d25cSMark Johnston 		nd6_ra_input(m, off, icmp6len);
7662d12d25cSMark Johnston 		m = n;
7672d12d25cSMark Johnston 		if (m == NULL)
768e7a6db74SAna Kukec 			goto freeit;
76982cd038dSYoshinobu Inoue 		break;
77082cd038dSYoshinobu Inoue 
77182cd038dSYoshinobu Inoue 	case ND_NEIGHBOR_SOLICIT:
77229dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit);
77382cd038dSYoshinobu Inoue 		if (code != 0)
77482cd038dSYoshinobu Inoue 			goto badcode;
77582cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_neighbor_solicit))
77682cd038dSYoshinobu Inoue 			goto badlen;
7771db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
7782d12d25cSMark Johnston 			error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
7792d12d25cSMark Johnston 			if (error == 0) {
780686cdd19SJun-ichiro itojun Hagino 				m = NULL;
781686cdd19SJun-ichiro itojun Hagino 				goto freeit;
782686cdd19SJun-ichiro itojun Hagino 			}
7832d12d25cSMark Johnston 		}
7842d12d25cSMark Johnston 		n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
7852d12d25cSMark Johnston 		nd6_ns_input(m, off, icmp6len);
7862d12d25cSMark Johnston 		m = n;
7872d12d25cSMark Johnston 		if (m == NULL)
788e7a6db74SAna Kukec 			goto freeit;
78982cd038dSYoshinobu Inoue 		break;
79082cd038dSYoshinobu Inoue 
79182cd038dSYoshinobu Inoue 	case ND_NEIGHBOR_ADVERT:
79229dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert);
79382cd038dSYoshinobu Inoue 		if (code != 0)
79482cd038dSYoshinobu Inoue 			goto badcode;
79582cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_neighbor_advert))
79682cd038dSYoshinobu Inoue 			goto badlen;
7971db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
7982d12d25cSMark Johnston 			error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
7992d12d25cSMark Johnston 			if (error == 0) {
800686cdd19SJun-ichiro itojun Hagino 				m = NULL;
801686cdd19SJun-ichiro itojun Hagino 				goto freeit;
802686cdd19SJun-ichiro itojun Hagino 			}
8032d12d25cSMark Johnston 		}
8042d12d25cSMark Johnston 		n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
8052d12d25cSMark Johnston 		nd6_na_input(m, off, icmp6len);
8062d12d25cSMark Johnston 		m = n;
8072d12d25cSMark Johnston 		if (m == NULL)
808e7a6db74SAna Kukec 			goto freeit;
80982cd038dSYoshinobu Inoue 		break;
81082cd038dSYoshinobu Inoue 
81182cd038dSYoshinobu Inoue 	case ND_REDIRECT:
81229dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_redirect);
81382cd038dSYoshinobu Inoue 		if (code != 0)
81482cd038dSYoshinobu Inoue 			goto badcode;
81582cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_redirect))
81682cd038dSYoshinobu Inoue 			goto badlen;
8171db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
8182d12d25cSMark Johnston 			error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
8192d12d25cSMark Johnston 			if (error == 0) {
820686cdd19SJun-ichiro itojun Hagino 				m = NULL;
821686cdd19SJun-ichiro itojun Hagino 				goto freeit;
822686cdd19SJun-ichiro itojun Hagino 			}
8232d12d25cSMark Johnston 		}
8242d12d25cSMark Johnston 		n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
8252d12d25cSMark Johnston 		icmp6_redirect_input(m, off);
8262d12d25cSMark Johnston 		m = n;
8272d12d25cSMark Johnston 		if (m == NULL)
828e7a6db74SAna Kukec 			goto freeit;
82982cd038dSYoshinobu Inoue 		break;
83082cd038dSYoshinobu Inoue 
83182cd038dSYoshinobu Inoue 	case ICMP6_ROUTER_RENUMBERING:
83282cd038dSYoshinobu Inoue 		if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
83382cd038dSYoshinobu Inoue 		    code != ICMP6_ROUTER_RENUMBERING_RESULT)
83482cd038dSYoshinobu Inoue 			goto badcode;
83582cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct icmp6_router_renum))
83682cd038dSYoshinobu Inoue 			goto badlen;
83782cd038dSYoshinobu Inoue 		break;
83882cd038dSYoshinobu Inoue 
83982cd038dSYoshinobu Inoue 	default:
84033841545SHajimu UMEMOTO 		nd6log((LOG_DEBUG,
84133841545SHajimu UMEMOTO 		    "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
8421d54aa3bSBjoern A. Zeeb 		    icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
8431d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6bufd, &ip6->ip6_dst),
84429dc7bc6SBruce M Simpson 		    ifp ? ifp->if_index : 0));
84582cd038dSYoshinobu Inoue 		if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
84682cd038dSYoshinobu Inoue 			/* ICMPv6 error: MUST deliver it by spec... */
84782cd038dSYoshinobu Inoue 			code = PRC_NCMDS;
84882cd038dSYoshinobu Inoue 			/* deliver */
84982cd038dSYoshinobu Inoue 		} else {
85082cd038dSYoshinobu Inoue 			/* ICMPv6 informational: MUST not deliver */
85182cd038dSYoshinobu Inoue 			break;
85282cd038dSYoshinobu Inoue 		}
85382cd038dSYoshinobu Inoue 	deliver:
85414c129fcSBjoern A. Zeeb 		if (icmp6_notify_error(&m, off, icmp6len, code) != 0) {
85533841545SHajimu UMEMOTO 			/* In this case, m should've been freed. */
85633841545SHajimu UMEMOTO 			return (IPPROTO_DONE);
85733841545SHajimu UMEMOTO 		}
85833841545SHajimu UMEMOTO 		break;
85933841545SHajimu UMEMOTO 
86033841545SHajimu UMEMOTO 	badcode:
861e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_badcode);
86233841545SHajimu UMEMOTO 		break;
86333841545SHajimu UMEMOTO 
86433841545SHajimu UMEMOTO 	badlen:
865e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_badlen);
86633841545SHajimu UMEMOTO 		break;
86733841545SHajimu UMEMOTO 	}
86833841545SHajimu UMEMOTO 
86933841545SHajimu UMEMOTO 	/* deliver the packet to appropriate sockets */
87033841545SHajimu UMEMOTO 	icmp6_rip6_input(&m, *offp);
87133841545SHajimu UMEMOTO 
87233841545SHajimu UMEMOTO 	return IPPROTO_DONE;
87333841545SHajimu UMEMOTO 
87433841545SHajimu UMEMOTO  freeit:
87533841545SHajimu UMEMOTO 	m_freem(m);
87633841545SHajimu UMEMOTO 	return IPPROTO_DONE;
87733841545SHajimu UMEMOTO }
87833841545SHajimu UMEMOTO 
87933841545SHajimu UMEMOTO static int
8801272577eSXin LI icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code)
88133841545SHajimu UMEMOTO {
882503f4e47SBjoern A. Zeeb 	struct mbuf *m;
88333841545SHajimu UMEMOTO 	struct icmp6_hdr *icmp6;
88433841545SHajimu UMEMOTO 	struct ip6_hdr *eip6;
88533841545SHajimu UMEMOTO 	u_int32_t notifymtu;
88633841545SHajimu UMEMOTO 	struct sockaddr_in6 icmp6src, icmp6dst;
88733841545SHajimu UMEMOTO 
888503f4e47SBjoern A. Zeeb 	m = *mp;
889503f4e47SBjoern A. Zeeb 
89082cd038dSYoshinobu Inoue 	if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
891e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
89282cd038dSYoshinobu Inoue 		goto freeit;
89382cd038dSYoshinobu Inoue 	}
894686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
89582cd038dSYoshinobu Inoue 	IP6_EXTHDR_CHECK(m, off,
89606cd0a3fSHajimu UMEMOTO 	    sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1);
89782cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
898686cdd19SJun-ichiro itojun Hagino #else
899686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
900686cdd19SJun-ichiro itojun Hagino 	    sizeof(*icmp6) + sizeof(struct ip6_hdr));
901686cdd19SJun-ichiro itojun Hagino 	if (icmp6 == NULL) {
902e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
90333841545SHajimu UMEMOTO 		return (-1);
904686cdd19SJun-ichiro itojun Hagino 	}
905686cdd19SJun-ichiro itojun Hagino #endif
90633841545SHajimu UMEMOTO 	eip6 = (struct ip6_hdr *)(icmp6 + 1);
90782cd038dSYoshinobu Inoue 
90882cd038dSYoshinobu Inoue 	/* Detect the upper level protocol */
90982cd038dSYoshinobu Inoue 	{
9109233d8f3SDavid E. O'Brien 		void (*ctlfunc)(int, struct sockaddr *, void *);
91182cd038dSYoshinobu Inoue 		u_int8_t nxt = eip6->ip6_nxt;
91282cd038dSYoshinobu Inoue 		int eoff = off + sizeof(struct icmp6_hdr) +
91382cd038dSYoshinobu Inoue 		    sizeof(struct ip6_hdr);
91482cd038dSYoshinobu Inoue 		struct ip6ctlparam ip6cp;
915686cdd19SJun-ichiro itojun Hagino 		struct in6_addr *finaldst = NULL;
916686cdd19SJun-ichiro itojun Hagino 		int icmp6type = icmp6->icmp6_type;
917686cdd19SJun-ichiro itojun Hagino 		struct ip6_frag *fh;
918686cdd19SJun-ichiro itojun Hagino 		struct ip6_rthdr *rth;
919686cdd19SJun-ichiro itojun Hagino 		struct ip6_rthdr0 *rth0;
920686cdd19SJun-ichiro itojun Hagino 		int rthlen;
92182cd038dSYoshinobu Inoue 
92288ff5695SSUZUKI Shinsuke 		while (1) { /* XXX: should avoid infinite loop explicitly? */
92382cd038dSYoshinobu Inoue 			struct ip6_ext *eh;
92482cd038dSYoshinobu Inoue 
92582cd038dSYoshinobu Inoue 			switch (nxt) {
92682cd038dSYoshinobu Inoue 			case IPPROTO_HOPOPTS:
92782cd038dSYoshinobu Inoue 			case IPPROTO_DSTOPTS:
92882cd038dSYoshinobu Inoue 			case IPPROTO_AH:
929686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
93006cd0a3fSHajimu UMEMOTO 				IP6_EXTHDR_CHECK(m, 0,
93106cd0a3fSHajimu UMEMOTO 				    eoff + sizeof(struct ip6_ext), -1);
9320527d333SHajimu UMEMOTO 				eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff);
933686cdd19SJun-ichiro itojun Hagino #else
934686cdd19SJun-ichiro itojun Hagino 				IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
935686cdd19SJun-ichiro itojun Hagino 				    eoff, sizeof(*eh));
936686cdd19SJun-ichiro itojun Hagino 				if (eh == NULL) {
937e27b0c87SRobert Watson 					ICMP6STAT_INC(icp6s_tooshort);
93833841545SHajimu UMEMOTO 					return (-1);
939686cdd19SJun-ichiro itojun Hagino 				}
940686cdd19SJun-ichiro itojun Hagino #endif
941686cdd19SJun-ichiro itojun Hagino 
94282cd038dSYoshinobu Inoue 				if (nxt == IPPROTO_AH)
94382cd038dSYoshinobu Inoue 					eoff += (eh->ip6e_len + 2) << 2;
94482cd038dSYoshinobu Inoue 				else
94582cd038dSYoshinobu Inoue 					eoff += (eh->ip6e_len + 1) << 3;
94682cd038dSYoshinobu Inoue 				nxt = eh->ip6e_nxt;
94782cd038dSYoshinobu Inoue 				break;
948686cdd19SJun-ichiro itojun Hagino 			case IPPROTO_ROUTING:
949686cdd19SJun-ichiro itojun Hagino 				/*
950686cdd19SJun-ichiro itojun Hagino 				 * When the erroneous packet contains a
951686cdd19SJun-ichiro itojun Hagino 				 * routing header, we should examine the
952686cdd19SJun-ichiro itojun Hagino 				 * header to determine the final destination.
953686cdd19SJun-ichiro itojun Hagino 				 * Otherwise, we can't properly update
954686cdd19SJun-ichiro itojun Hagino 				 * information that depends on the final
955686cdd19SJun-ichiro itojun Hagino 				 * destination (e.g. path MTU).
956686cdd19SJun-ichiro itojun Hagino 				 */
957686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
95806cd0a3fSHajimu UMEMOTO 				IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1);
95906cd0a3fSHajimu UMEMOTO 				rth = (struct ip6_rthdr *)
96006cd0a3fSHajimu UMEMOTO 				    (mtod(m, caddr_t) + eoff);
961686cdd19SJun-ichiro itojun Hagino #else
962686cdd19SJun-ichiro itojun Hagino 				IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
963686cdd19SJun-ichiro itojun Hagino 				    eoff, sizeof(*rth));
964686cdd19SJun-ichiro itojun Hagino 				if (rth == NULL) {
965e27b0c87SRobert Watson 					ICMP6STAT_INC(icp6s_tooshort);
96633841545SHajimu UMEMOTO 					return (-1);
967686cdd19SJun-ichiro itojun Hagino 				}
968686cdd19SJun-ichiro itojun Hagino #endif
969686cdd19SJun-ichiro itojun Hagino 				rthlen = (rth->ip6r_len + 1) << 3;
970686cdd19SJun-ichiro itojun Hagino 				/*
971686cdd19SJun-ichiro itojun Hagino 				 * XXX: currently there is no
972686cdd19SJun-ichiro itojun Hagino 				 * officially defined type other
973686cdd19SJun-ichiro itojun Hagino 				 * than type-0.
974686cdd19SJun-ichiro itojun Hagino 				 * Note that if the segment left field
975686cdd19SJun-ichiro itojun Hagino 				 * is 0, all intermediate hops must
976686cdd19SJun-ichiro itojun Hagino 				 * have been passed.
977686cdd19SJun-ichiro itojun Hagino 				 */
978686cdd19SJun-ichiro itojun Hagino 				if (rth->ip6r_segleft &&
979686cdd19SJun-ichiro itojun Hagino 				    rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
980686cdd19SJun-ichiro itojun Hagino 					int hops;
981686cdd19SJun-ichiro itojun Hagino 
982686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
98306cd0a3fSHajimu UMEMOTO 					IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1);
98406cd0a3fSHajimu UMEMOTO 					rth0 = (struct ip6_rthdr0 *)
98506cd0a3fSHajimu UMEMOTO 					    (mtod(m, caddr_t) + eoff);
986686cdd19SJun-ichiro itojun Hagino #else
987686cdd19SJun-ichiro itojun Hagino 					IP6_EXTHDR_GET(rth0,
988686cdd19SJun-ichiro itojun Hagino 					    struct ip6_rthdr0 *, m,
989686cdd19SJun-ichiro itojun Hagino 					    eoff, rthlen);
990686cdd19SJun-ichiro itojun Hagino 					if (rth0 == NULL) {
991e27b0c87SRobert Watson 						ICMP6STAT_INC(icp6s_tooshort);
99233841545SHajimu UMEMOTO 						return (-1);
993686cdd19SJun-ichiro itojun Hagino 					}
994686cdd19SJun-ichiro itojun Hagino #endif
995686cdd19SJun-ichiro itojun Hagino 					/* just ignore a bogus header */
996686cdd19SJun-ichiro itojun Hagino 					if ((rth0->ip6r0_len % 2) == 0 &&
997686cdd19SJun-ichiro itojun Hagino 					    (hops = rth0->ip6r0_len/2))
998686cdd19SJun-ichiro itojun Hagino 						finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
999686cdd19SJun-ichiro itojun Hagino 				}
1000686cdd19SJun-ichiro itojun Hagino 				eoff += rthlen;
1001686cdd19SJun-ichiro itojun Hagino 				nxt = rth->ip6r_nxt;
1002686cdd19SJun-ichiro itojun Hagino 				break;
1003686cdd19SJun-ichiro itojun Hagino 			case IPPROTO_FRAGMENT:
1004686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
1005686cdd19SJun-ichiro itojun Hagino 				IP6_EXTHDR_CHECK(m, 0, eoff +
100606cd0a3fSHajimu UMEMOTO 				    sizeof(struct ip6_frag), -1);
100706cd0a3fSHajimu UMEMOTO 				fh = (struct ip6_frag *)(mtod(m, caddr_t) +
100806cd0a3fSHajimu UMEMOTO 				    eoff);
1009686cdd19SJun-ichiro itojun Hagino #else
1010686cdd19SJun-ichiro itojun Hagino 				IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1011686cdd19SJun-ichiro itojun Hagino 				    eoff, sizeof(*fh));
1012686cdd19SJun-ichiro itojun Hagino 				if (fh == NULL) {
1013e27b0c87SRobert Watson 					ICMP6STAT_INC(icp6s_tooshort);
101433841545SHajimu UMEMOTO 					return (-1);
1015686cdd19SJun-ichiro itojun Hagino 				}
1016686cdd19SJun-ichiro itojun Hagino #endif
1017686cdd19SJun-ichiro itojun Hagino 				/*
1018686cdd19SJun-ichiro itojun Hagino 				 * Data after a fragment header is meaningless
1019686cdd19SJun-ichiro itojun Hagino 				 * unless it is the first fragment, but
1020686cdd19SJun-ichiro itojun Hagino 				 * we'll go to the notify label for path MTU
1021686cdd19SJun-ichiro itojun Hagino 				 * discovery.
1022686cdd19SJun-ichiro itojun Hagino 				 */
1023686cdd19SJun-ichiro itojun Hagino 				if (fh->ip6f_offlg & IP6F_OFF_MASK)
1024686cdd19SJun-ichiro itojun Hagino 					goto notify;
1025686cdd19SJun-ichiro itojun Hagino 
1026686cdd19SJun-ichiro itojun Hagino 				eoff += sizeof(struct ip6_frag);
1027686cdd19SJun-ichiro itojun Hagino 				nxt = fh->ip6f_nxt;
1028686cdd19SJun-ichiro itojun Hagino 				break;
102982cd038dSYoshinobu Inoue 			default:
1030686cdd19SJun-ichiro itojun Hagino 				/*
1031686cdd19SJun-ichiro itojun Hagino 				 * This case includes ESP and the No Next
1032686cdd19SJun-ichiro itojun Hagino 				 * Header.  In such cases going to the notify
1033686cdd19SJun-ichiro itojun Hagino 				 * label does not have any meaning
1034686cdd19SJun-ichiro itojun Hagino 				 * (i.e. ctlfunc will be NULL), but we go
1035686cdd19SJun-ichiro itojun Hagino 				 * anyway since we might have to update
1036686cdd19SJun-ichiro itojun Hagino 				 * path MTU information.
1037686cdd19SJun-ichiro itojun Hagino 				 */
103882cd038dSYoshinobu Inoue 				goto notify;
103982cd038dSYoshinobu Inoue 			}
104082cd038dSYoshinobu Inoue 		}
104182cd038dSYoshinobu Inoue 	  notify:
1042686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
104382cd038dSYoshinobu Inoue 		icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1044686cdd19SJun-ichiro itojun Hagino #else
1045686cdd19SJun-ichiro itojun Hagino 		IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1046686cdd19SJun-ichiro itojun Hagino 		    sizeof(*icmp6) + sizeof(struct ip6_hdr));
1047686cdd19SJun-ichiro itojun Hagino 		if (icmp6 == NULL) {
1048e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_tooshort);
104933841545SHajimu UMEMOTO 			return (-1);
1050686cdd19SJun-ichiro itojun Hagino 		}
1051686cdd19SJun-ichiro itojun Hagino #endif
105233841545SHajimu UMEMOTO 
105306cd0a3fSHajimu UMEMOTO 		/*
105406cd0a3fSHajimu UMEMOTO 		 * retrieve parameters from the inner IPv6 header, and convert
105506cd0a3fSHajimu UMEMOTO 		 * them into sockaddr structures.
105606cd0a3fSHajimu UMEMOTO 		 * XXX: there is no guarantee that the source or destination
105706cd0a3fSHajimu UMEMOTO 		 * addresses of the inner packet are in the same scope as
105806cd0a3fSHajimu UMEMOTO 		 * the addresses of the icmp packet.  But there is no other
105906cd0a3fSHajimu UMEMOTO 		 * way to determine the zone.
106006cd0a3fSHajimu UMEMOTO 		 */
106133841545SHajimu UMEMOTO 		eip6 = (struct ip6_hdr *)(icmp6 + 1);
106206cd0a3fSHajimu UMEMOTO 
106333841545SHajimu UMEMOTO 		bzero(&icmp6dst, sizeof(icmp6dst));
106433841545SHajimu UMEMOTO 		icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
106533841545SHajimu UMEMOTO 		icmp6dst.sin6_family = AF_INET6;
1066686cdd19SJun-ichiro itojun Hagino 		if (finaldst == NULL)
106733841545SHajimu UMEMOTO 			icmp6dst.sin6_addr = eip6->ip6_dst;
106833841545SHajimu UMEMOTO 		else
106933841545SHajimu UMEMOTO 			icmp6dst.sin6_addr = *finaldst;
1070a1f7e5f8SHajimu UMEMOTO 		if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
10719a4f9608SHajimu UMEMOTO 			goto freeit;
107233841545SHajimu UMEMOTO 		bzero(&icmp6src, sizeof(icmp6src));
107333841545SHajimu UMEMOTO 		icmp6src.sin6_len = sizeof(struct sockaddr_in6);
107433841545SHajimu UMEMOTO 		icmp6src.sin6_family = AF_INET6;
107533841545SHajimu UMEMOTO 		icmp6src.sin6_addr = eip6->ip6_src;
1076a1f7e5f8SHajimu UMEMOTO 		if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
10779a4f9608SHajimu UMEMOTO 			goto freeit;
1078a1f7e5f8SHajimu UMEMOTO 		icmp6src.sin6_flowinfo =
1079a1f7e5f8SHajimu UMEMOTO 		    (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
108033841545SHajimu UMEMOTO 
108133841545SHajimu UMEMOTO 		if (finaldst == NULL)
108233841545SHajimu UMEMOTO 			finaldst = &eip6->ip6_dst;
108333841545SHajimu UMEMOTO 		ip6cp.ip6c_m = m;
108433841545SHajimu UMEMOTO 		ip6cp.ip6c_icmp6 = icmp6;
108533841545SHajimu UMEMOTO 		ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
108633841545SHajimu UMEMOTO 		ip6cp.ip6c_off = eoff;
108733841545SHajimu UMEMOTO 		ip6cp.ip6c_finaldst = finaldst;
108833841545SHajimu UMEMOTO 		ip6cp.ip6c_src = &icmp6src;
108933841545SHajimu UMEMOTO 		ip6cp.ip6c_nxt = nxt;
109033841545SHajimu UMEMOTO 
109133841545SHajimu UMEMOTO 		if (icmp6type == ICMP6_PACKET_TOO_BIG) {
109233841545SHajimu UMEMOTO 			notifymtu = ntohl(icmp6->icmp6_mtu);
109333841545SHajimu UMEMOTO 			ip6cp.ip6c_cmdarg = (void *)&notifymtu;
109433841545SHajimu UMEMOTO 			icmp6_mtudisc_update(&ip6cp, 1);	/*XXX*/
1095686cdd19SJun-ichiro itojun Hagino 		}
1096686cdd19SJun-ichiro itojun Hagino 
10979233d8f3SDavid E. O'Brien 		ctlfunc = (void (*)(int, struct sockaddr *, void *))
109882cd038dSYoshinobu Inoue 		    (inet6sw[ip6_protox[nxt]].pr_ctlinput);
109982cd038dSYoshinobu Inoue 		if (ctlfunc) {
110033841545SHajimu UMEMOTO 			(void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
110133841545SHajimu UMEMOTO 			    &ip6cp);
110282cd038dSYoshinobu Inoue 		}
110382cd038dSYoshinobu Inoue 	}
11049c0fda72SHajimu UMEMOTO 	*mp = m;
110533841545SHajimu UMEMOTO 	return (0);
110682cd038dSYoshinobu Inoue 
110782cd038dSYoshinobu Inoue   freeit:
110882cd038dSYoshinobu Inoue 	m_freem(m);
110933841545SHajimu UMEMOTO 	return (-1);
111082cd038dSYoshinobu Inoue }
111182cd038dSYoshinobu Inoue 
111233841545SHajimu UMEMOTO void
11131272577eSXin LI icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1114686cdd19SJun-ichiro itojun Hagino {
111533841545SHajimu UMEMOTO 	struct in6_addr *dst = ip6cp->ip6c_finaldst;
111633841545SHajimu UMEMOTO 	struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
111733841545SHajimu UMEMOTO 	struct mbuf *m = ip6cp->ip6c_m;	/* will be necessary for scope issue */
1118686cdd19SJun-ichiro itojun Hagino 	u_int mtu = ntohl(icmp6->icmp6_mtu);
111997d8d152SAndre Oppermann 	struct in_conninfo inc;
1120686cdd19SJun-ichiro itojun Hagino 
1121f95d4633SHajimu UMEMOTO #if 0
1122f95d4633SHajimu UMEMOTO 	/*
1123f95d4633SHajimu UMEMOTO 	 * RFC2460 section 5, last paragraph.
1124f95d4633SHajimu UMEMOTO 	 * even though minimum link MTU for IPv6 is IPV6_MMTU,
1125f95d4633SHajimu UMEMOTO 	 * we may see ICMPv6 too big with mtu < IPV6_MMTU
1126f95d4633SHajimu UMEMOTO 	 * due to packet translator in the middle.
1127f95d4633SHajimu UMEMOTO 	 * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
1128f95d4633SHajimu UMEMOTO 	 * special handling.
1129f95d4633SHajimu UMEMOTO 	 */
1130f95d4633SHajimu UMEMOTO 	if (mtu < IPV6_MMTU)
1131f95d4633SHajimu UMEMOTO 		return;
1132f95d4633SHajimu UMEMOTO #endif
1133f95d4633SHajimu UMEMOTO 
1134f95d4633SHajimu UMEMOTO 	/*
1135f95d4633SHajimu UMEMOTO 	 * we reject ICMPv6 too big with abnormally small value.
1136f95d4633SHajimu UMEMOTO 	 * XXX what is the good definition of "abnormally small"?
1137f95d4633SHajimu UMEMOTO 	 */
1138f95d4633SHajimu UMEMOTO 	if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1139f95d4633SHajimu UMEMOTO 		return;
1140f95d4633SHajimu UMEMOTO 
114133841545SHajimu UMEMOTO 	if (!validated)
114233841545SHajimu UMEMOTO 		return;
114333841545SHajimu UMEMOTO 
114459ca51adSSimon L. B. Nielsen 	/*
114559ca51adSSimon L. B. Nielsen 	 * In case the suggested mtu is less than IPV6_MMTU, we
114659ca51adSSimon L. B. Nielsen 	 * only need to remember that it was for above mentioned
114759ca51adSSimon L. B. Nielsen 	 * "alwaysfrag" case.
114859ca51adSSimon L. B. Nielsen 	 * Try to be as close to the spec as possible.
114959ca51adSSimon L. B. Nielsen 	 */
115059ca51adSSimon L. B. Nielsen 	if (mtu < IPV6_MMTU)
115159ca51adSSimon L. B. Nielsen 		mtu = IPV6_MMTU - 8;
115259ca51adSSimon L. B. Nielsen 
115397d8d152SAndre Oppermann 	bzero(&inc, sizeof(inc));
1154baa09f18SAndrey V. Elsukov 	inc.inc_fibnum = M_GETFIB(m);
1155dcdb4371SBjoern A. Zeeb 	inc.inc_flags |= INC_ISIPV6;
115697d8d152SAndre Oppermann 	inc.inc6_faddr = *dst;
1157a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
1158a1f7e5f8SHajimu UMEMOTO 		return;
1159686cdd19SJun-ichiro itojun Hagino 
1160233dcce1SAndre Oppermann 	if (mtu < tcp_maxmtu6(&inc, NULL)) {
116197d8d152SAndre Oppermann 		tcp_hc_updatemtu(&inc, mtu);
1162e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_pmtuchg);
1163686cdd19SJun-ichiro itojun Hagino 	}
1164686cdd19SJun-ichiro itojun Hagino }
1165686cdd19SJun-ichiro itojun Hagino 
116682cd038dSYoshinobu Inoue /*
116733841545SHajimu UMEMOTO  * Process a Node Information Query packet, based on
116833841545SHajimu UMEMOTO  * draft-ietf-ipngwg-icmp-name-lookups-07.
1169686cdd19SJun-ichiro itojun Hagino  *
1170686cdd19SJun-ichiro itojun Hagino  * Spec incompatibilities:
1171686cdd19SJun-ichiro itojun Hagino  * - IPv6 Subject address handling
1172686cdd19SJun-ichiro itojun Hagino  * - IPv4 Subject address handling support missing
1173686cdd19SJun-ichiro itojun Hagino  * - Proxy reply (answer even if it's not for me)
1174686cdd19SJun-ichiro itojun Hagino  * - joins NI group address at in6_ifattach() time only, does not cope
1175686cdd19SJun-ichiro itojun Hagino  *   with hostname changes by sethostname(3)
117682cd038dSYoshinobu Inoue  */
117782cd038dSYoshinobu Inoue static struct mbuf *
11787460ef5dSHiroki Sato ni6_input(struct mbuf *m, int off, struct prison *pr)
117982cd038dSYoshinobu Inoue {
1180686cdd19SJun-ichiro itojun Hagino 	struct icmp6_nodeinfo *ni6, *nni6;
118182cd038dSYoshinobu Inoue 	struct mbuf *n = NULL;
1182686cdd19SJun-ichiro itojun Hagino 	u_int16_t qtype;
1183686cdd19SJun-ichiro itojun Hagino 	int subjlen;
118482cd038dSYoshinobu Inoue 	int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
118582cd038dSYoshinobu Inoue 	struct ni_reply_fqdn *fqdn;
118682cd038dSYoshinobu Inoue 	int addrs;		/* for NI_QTYPE_NODEADDR */
118782cd038dSYoshinobu Inoue 	struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1188a1f7e5f8SHajimu UMEMOTO 	struct in6_addr in6_subj; /* subject address */
1189686cdd19SJun-ichiro itojun Hagino 	struct ip6_hdr *ip6;
1190686cdd19SJun-ichiro itojun Hagino 	int oldfqdn = 0;	/* if 1, return pascal string (03 draft) */
119133841545SHajimu UMEMOTO 	char *subj = NULL;
119233841545SHajimu UMEMOTO 	struct in6_ifaddr *ia6 = NULL;
119382cd038dSYoshinobu Inoue 
1194686cdd19SJun-ichiro itojun Hagino 	ip6 = mtod(m, struct ip6_hdr *);
1195686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
1196686cdd19SJun-ichiro itojun Hagino 	ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1197686cdd19SJun-ichiro itojun Hagino #else
1198686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1199686cdd19SJun-ichiro itojun Hagino 	if (ni6 == NULL) {
1200686cdd19SJun-ichiro itojun Hagino 		/* m is already reclaimed */
120106cd0a3fSHajimu UMEMOTO 		return (NULL);
1202686cdd19SJun-ichiro itojun Hagino 	}
1203686cdd19SJun-ichiro itojun Hagino #endif
1204686cdd19SJun-ichiro itojun Hagino 
1205686cdd19SJun-ichiro itojun Hagino 	/*
120618706985SJINMEI Tatuya 	 * Validate IPv6 source address.
120718706985SJINMEI Tatuya 	 * The default configuration MUST be to refuse answering queries from
120818706985SJINMEI Tatuya 	 * global-scope addresses according to RFC4602.
120918706985SJINMEI Tatuya 	 * Notes:
121018706985SJINMEI Tatuya 	 *  - it's not very clear what "refuse" means; this implementation
121118706985SJINMEI Tatuya 	 *    simply drops it.
121218706985SJINMEI Tatuya 	 *  - it's not very easy to identify global-scope (unicast) addresses
121318706985SJINMEI Tatuya 	 *    since there are many prefixes for them.  It should be safer
121418706985SJINMEI Tatuya 	 *    and in practice sufficient to check "all" but loopback and
121518706985SJINMEI Tatuya 	 *    link-local (note that site-local unicast was deprecated and
121618706985SJINMEI Tatuya 	 *    ULA is defined as global scope-wise)
121718706985SJINMEI Tatuya 	 */
1218603724d3SBjoern A. Zeeb 	if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
121918706985SJINMEI Tatuya 	    !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
122018706985SJINMEI Tatuya 	    !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
122118706985SJINMEI Tatuya 		goto bad;
122218706985SJINMEI Tatuya 
122318706985SJINMEI Tatuya 	/*
1224686cdd19SJun-ichiro itojun Hagino 	 * Validate IPv6 destination address.
1225686cdd19SJun-ichiro itojun Hagino 	 *
122633841545SHajimu UMEMOTO 	 * The Responder must discard the Query without further processing
122733841545SHajimu UMEMOTO 	 * unless it is one of the Responder's unicast or anycast addresses, or
122833841545SHajimu UMEMOTO 	 * a link-local scope multicast address which the Responder has joined.
122918706985SJINMEI Tatuya 	 * [RFC4602, Section 5.]
1230686cdd19SJun-ichiro itojun Hagino 	 */
12312a5aafceSHajimu UMEMOTO 	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
12322a5aafceSHajimu UMEMOTO 		if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
12332a5aafceSHajimu UMEMOTO 			goto bad;
12342a5aafceSHajimu UMEMOTO 		/* else it's a link-local multicast, fine */
12352a5aafceSHajimu UMEMOTO 	} else {		/* unicast or anycast */
12363e88eb90SAndrey V. Elsukov 		ia6 = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */);
12373e88eb90SAndrey V. Elsukov 		if (ia6 == NULL)
12382a5aafceSHajimu UMEMOTO 			goto bad; /* XXX impossible */
12392a5aafceSHajimu UMEMOTO 
12402a5aafceSHajimu UMEMOTO 		if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1241603724d3SBjoern A. Zeeb 		    !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
12428c0fec80SRobert Watson 			ifa_free(&ia6->ia_ifa);
124333841545SHajimu UMEMOTO 			nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
124433841545SHajimu UMEMOTO 				"a temporary address in %s:%d",
124533841545SHajimu UMEMOTO 			       __FILE__, __LINE__));
124633841545SHajimu UMEMOTO 			goto bad;
124733841545SHajimu UMEMOTO 		}
12488c0fec80SRobert Watson 		ifa_free(&ia6->ia_ifa);
12492a5aafceSHajimu UMEMOTO 	}
1250686cdd19SJun-ichiro itojun Hagino 
1251686cdd19SJun-ichiro itojun Hagino 	/* validate query Subject field. */
125233841545SHajimu UMEMOTO 	qtype = ntohs(ni6->ni_qtype);
1253686cdd19SJun-ichiro itojun Hagino 	subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1254686cdd19SJun-ichiro itojun Hagino 	switch (qtype) {
1255686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_NOOP:
1256686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_SUPTYPES:
125733841545SHajimu UMEMOTO 		/* 07 draft */
125833841545SHajimu UMEMOTO 		if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1259686cdd19SJun-ichiro itojun Hagino 			break;
126033841545SHajimu UMEMOTO 		/* FALLTHROUGH */
1261686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_FQDN:
1262686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_NODEADDR:
1263a22adbc6SSUZUKI Shinsuke 	case NI_QTYPE_IPV4ADDR:
1264686cdd19SJun-ichiro itojun Hagino 		switch (ni6->ni_code) {
1265686cdd19SJun-ichiro itojun Hagino 		case ICMP6_NI_SUBJ_IPV6:
1266686cdd19SJun-ichiro itojun Hagino #if ICMP6_NI_SUBJ_IPV6 != 0
1267686cdd19SJun-ichiro itojun Hagino 		case 0:
1268686cdd19SJun-ichiro itojun Hagino #endif
1269686cdd19SJun-ichiro itojun Hagino 			/*
1270686cdd19SJun-ichiro itojun Hagino 			 * backward compatibility - try to accept 03 draft
1271686cdd19SJun-ichiro itojun Hagino 			 * format, where no Subject is present.
1272686cdd19SJun-ichiro itojun Hagino 			 */
127333841545SHajimu UMEMOTO 			if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
127433841545SHajimu UMEMOTO 			    subjlen == 0) {
1275686cdd19SJun-ichiro itojun Hagino 				oldfqdn++;
1276686cdd19SJun-ichiro itojun Hagino 				break;
1277686cdd19SJun-ichiro itojun Hagino 			}
127833841545SHajimu UMEMOTO #if ICMP6_NI_SUBJ_IPV6 != 0
127933841545SHajimu UMEMOTO 			if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
128033841545SHajimu UMEMOTO 				goto bad;
128133841545SHajimu UMEMOTO #endif
1282686cdd19SJun-ichiro itojun Hagino 
12832a5aafceSHajimu UMEMOTO 			if (subjlen != sizeof(struct in6_addr))
1284686cdd19SJun-ichiro itojun Hagino 				goto bad;
1285686cdd19SJun-ichiro itojun Hagino 
1286686cdd19SJun-ichiro itojun Hagino 			/*
1287686cdd19SJun-ichiro itojun Hagino 			 * Validate Subject address.
1288686cdd19SJun-ichiro itojun Hagino 			 *
128933841545SHajimu UMEMOTO 			 * Not sure what exactly "address belongs to the node"
129033841545SHajimu UMEMOTO 			 * means in the spec, is it just unicast, or what?
1291686cdd19SJun-ichiro itojun Hagino 			 *
1292686cdd19SJun-ichiro itojun Hagino 			 * At this moment we consider Subject address as
1293686cdd19SJun-ichiro itojun Hagino 			 * "belong to the node" if the Subject address equals
1294686cdd19SJun-ichiro itojun Hagino 			 * to the IPv6 destination address; validation for
1295686cdd19SJun-ichiro itojun Hagino 			 * IPv6 destination address should have done enough
1296686cdd19SJun-ichiro itojun Hagino 			 * check for us.
1297686cdd19SJun-ichiro itojun Hagino 			 *
1298686cdd19SJun-ichiro itojun Hagino 			 * We do not do proxy at this moment.
1299686cdd19SJun-ichiro itojun Hagino 			 */
1300686cdd19SJun-ichiro itojun Hagino 			/* m_pulldown instead of copy? */
1301686cdd19SJun-ichiro itojun Hagino 			m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1302a1f7e5f8SHajimu UMEMOTO 			    subjlen, (caddr_t)&in6_subj);
1303a1f7e5f8SHajimu UMEMOTO 			if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
13049a4f9608SHajimu UMEMOTO 				goto bad;
13052a5aafceSHajimu UMEMOTO 
1306a1f7e5f8SHajimu UMEMOTO 			subj = (char *)&in6_subj;
1307a1f7e5f8SHajimu UMEMOTO 			if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1308686cdd19SJun-ichiro itojun Hagino 				break;
130933841545SHajimu UMEMOTO 
1310686cdd19SJun-ichiro itojun Hagino 			/*
1311686cdd19SJun-ichiro itojun Hagino 			 * XXX if we are to allow other cases, we should really
1312686cdd19SJun-ichiro itojun Hagino 			 * be careful about scope here.
1313686cdd19SJun-ichiro itojun Hagino 			 * basically, we should disallow queries toward IPv6
131406cd0a3fSHajimu UMEMOTO 			 * destination X with subject Y,
131506cd0a3fSHajimu UMEMOTO 			 * if scope(X) > scope(Y).
1316686cdd19SJun-ichiro itojun Hagino 			 * if we allow scope(X) > scope(Y), it will result in
1317686cdd19SJun-ichiro itojun Hagino 			 * information leakage across scope boundary.
1318686cdd19SJun-ichiro itojun Hagino 			 */
1319686cdd19SJun-ichiro itojun Hagino 			goto bad;
1320686cdd19SJun-ichiro itojun Hagino 
1321686cdd19SJun-ichiro itojun Hagino 		case ICMP6_NI_SUBJ_FQDN:
1322686cdd19SJun-ichiro itojun Hagino 			/*
1323686cdd19SJun-ichiro itojun Hagino 			 * Validate Subject name with gethostname(3).
1324686cdd19SJun-ichiro itojun Hagino 			 *
1325686cdd19SJun-ichiro itojun Hagino 			 * The behavior may need some debate, since:
1326686cdd19SJun-ichiro itojun Hagino 			 * - we are not sure if the node has FQDN as
1327686cdd19SJun-ichiro itojun Hagino 			 *   hostname (returned by gethostname(3)).
1328686cdd19SJun-ichiro itojun Hagino 			 * - the code does wildcard match for truncated names.
1329686cdd19SJun-ichiro itojun Hagino 			 *   however, we are not sure if we want to perform
1330686cdd19SJun-ichiro itojun Hagino 			 *   wildcard match, if gethostname(3) side has
1331686cdd19SJun-ichiro itojun Hagino 			 *   truncated hostname.
1332686cdd19SJun-ichiro itojun Hagino 			 */
133376ca6f88SJamie Gritton 			mtx_lock(&pr->pr_mtx);
1334c1f19219SJamie Gritton 			n = ni6_nametodns(pr->pr_hostname,
1335c1f19219SJamie Gritton 			    strlen(pr->pr_hostname), 0);
133676ca6f88SJamie Gritton 			mtx_unlock(&pr->pr_mtx);
1337686cdd19SJun-ichiro itojun Hagino 			if (!n || n->m_next || n->m_len == 0)
1338686cdd19SJun-ichiro itojun Hagino 				goto bad;
1339686cdd19SJun-ichiro itojun Hagino 			IP6_EXTHDR_GET(subj, char *, m,
1340686cdd19SJun-ichiro itojun Hagino 			    off + sizeof(struct icmp6_nodeinfo), subjlen);
1341686cdd19SJun-ichiro itojun Hagino 			if (subj == NULL)
1342686cdd19SJun-ichiro itojun Hagino 				goto bad;
1343686cdd19SJun-ichiro itojun Hagino 			if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1344686cdd19SJun-ichiro itojun Hagino 			    n->m_len)) {
1345686cdd19SJun-ichiro itojun Hagino 				goto bad;
1346686cdd19SJun-ichiro itojun Hagino 			}
1347686cdd19SJun-ichiro itojun Hagino 			m_freem(n);
1348686cdd19SJun-ichiro itojun Hagino 			n = NULL;
1349686cdd19SJun-ichiro itojun Hagino 			break;
1350686cdd19SJun-ichiro itojun Hagino 
135133841545SHajimu UMEMOTO 		case ICMP6_NI_SUBJ_IPV4:	/* XXX: to be implemented? */
1352686cdd19SJun-ichiro itojun Hagino 		default:
1353686cdd19SJun-ichiro itojun Hagino 			goto bad;
1354686cdd19SJun-ichiro itojun Hagino 		}
1355686cdd19SJun-ichiro itojun Hagino 		break;
1356686cdd19SJun-ichiro itojun Hagino 	}
1357686cdd19SJun-ichiro itojun Hagino 
135833841545SHajimu UMEMOTO 	/* refuse based on configuration.  XXX ICMP6_NI_REFUSED? */
135933841545SHajimu UMEMOTO 	switch (qtype) {
136033841545SHajimu UMEMOTO 	case NI_QTYPE_FQDN:
1361603724d3SBjoern A. Zeeb 		if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
136233841545SHajimu UMEMOTO 			goto bad;
136333841545SHajimu UMEMOTO 		break;
136433841545SHajimu UMEMOTO 	case NI_QTYPE_NODEADDR:
1365a22adbc6SSUZUKI Shinsuke 	case NI_QTYPE_IPV4ADDR:
1366603724d3SBjoern A. Zeeb 		if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
136733841545SHajimu UMEMOTO 			goto bad;
136833841545SHajimu UMEMOTO 		break;
136933841545SHajimu UMEMOTO 	}
137033841545SHajimu UMEMOTO 
137133841545SHajimu UMEMOTO 	/* guess reply length */
137233841545SHajimu UMEMOTO 	switch (qtype) {
137333841545SHajimu UMEMOTO 	case NI_QTYPE_NOOP:
137433841545SHajimu UMEMOTO 		break;		/* no reply data */
137533841545SHajimu UMEMOTO 	case NI_QTYPE_SUPTYPES:
137633841545SHajimu UMEMOTO 		replylen += sizeof(u_int32_t);
137733841545SHajimu UMEMOTO 		break;
137833841545SHajimu UMEMOTO 	case NI_QTYPE_FQDN:
137933841545SHajimu UMEMOTO 		/* XXX will append an mbuf */
138033841545SHajimu UMEMOTO 		replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
138133841545SHajimu UMEMOTO 		break;
138233841545SHajimu UMEMOTO 	case NI_QTYPE_NODEADDR:
1383c66b5feaSHajimu UMEMOTO 		addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
138433841545SHajimu UMEMOTO 		if ((replylen += addrs * (sizeof(struct in6_addr) +
138533841545SHajimu UMEMOTO 		    sizeof(u_int32_t))) > MCLBYTES)
138633841545SHajimu UMEMOTO 			replylen = MCLBYTES; /* XXX: will truncate pkt later */
138733841545SHajimu UMEMOTO 		break;
1388a22adbc6SSUZUKI Shinsuke 	case NI_QTYPE_IPV4ADDR:
1389a22adbc6SSUZUKI Shinsuke 		/* unsupported - should respond with unknown Qtype? */
1390a22adbc6SSUZUKI Shinsuke 		break;
139133841545SHajimu UMEMOTO 	default:
139233841545SHajimu UMEMOTO 		/*
139333841545SHajimu UMEMOTO 		 * XXX: We must return a reply with the ICMP6 code
139433841545SHajimu UMEMOTO 		 * `unknown Qtype' in this case.  However we regard the case
139533841545SHajimu UMEMOTO 		 * as an FQDN query for backward compatibility.
139633841545SHajimu UMEMOTO 		 * Older versions set a random value to this field,
139733841545SHajimu UMEMOTO 		 * so it rarely varies in the defined qtypes.
139833841545SHajimu UMEMOTO 		 * But the mechanism is not reliable...
139933841545SHajimu UMEMOTO 		 * maybe we should obsolete older versions.
140033841545SHajimu UMEMOTO 		 */
140133841545SHajimu UMEMOTO 		qtype = NI_QTYPE_FQDN;
140233841545SHajimu UMEMOTO 		/* XXX will append an mbuf */
140333841545SHajimu UMEMOTO 		replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
140433841545SHajimu UMEMOTO 		oldfqdn++;
140533841545SHajimu UMEMOTO 		break;
140633841545SHajimu UMEMOTO 	}
140733841545SHajimu UMEMOTO 
140810e5acc3SGleb Smirnoff 	/* Allocate an mbuf to reply. */
1409686cdd19SJun-ichiro itojun Hagino 	if (replylen > MCLBYTES) {
141082cd038dSYoshinobu Inoue 		/*
141133841545SHajimu UMEMOTO 		 * XXX: should we try to allocate more? But MCLBYTES
141233841545SHajimu UMEMOTO 		 * is probably much larger than IPV6_MMTU...
141382cd038dSYoshinobu Inoue 		 */
141482cd038dSYoshinobu Inoue 		goto bad;
1415686cdd19SJun-ichiro itojun Hagino 	}
141610e5acc3SGleb Smirnoff 	if (replylen > MHLEN)
141710e5acc3SGleb Smirnoff 		n = m_getcl(M_NOWAIT, m->m_type, M_PKTHDR);
141810e5acc3SGleb Smirnoff 	else
141910e5acc3SGleb Smirnoff 		n = m_gethdr(M_NOWAIT, m->m_type);
142010e5acc3SGleb Smirnoff 	if (n == NULL) {
142110e5acc3SGleb Smirnoff 		m_freem(m);
142210e5acc3SGleb Smirnoff 		return (NULL);
142382cd038dSYoshinobu Inoue 	}
142410e5acc3SGleb Smirnoff 	m_move_pkthdr(n, m); /* just for recvif and FIB */
142582cd038dSYoshinobu Inoue 	n->m_pkthdr.len = n->m_len = replylen;
142682cd038dSYoshinobu Inoue 
142782cd038dSYoshinobu Inoue 	/* copy mbuf header and IPv6 + Node Information base headers */
142882cd038dSYoshinobu Inoue 	bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
142982cd038dSYoshinobu Inoue 	nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1430686cdd19SJun-ichiro itojun Hagino 	bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
143182cd038dSYoshinobu Inoue 
143282cd038dSYoshinobu Inoue 	/* qtype dependent procedure */
143382cd038dSYoshinobu Inoue 	switch (qtype) {
143482cd038dSYoshinobu Inoue 	case NI_QTYPE_NOOP:
143533841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
143682cd038dSYoshinobu Inoue 		nni6->ni_flags = 0;
143782cd038dSYoshinobu Inoue 		break;
143882cd038dSYoshinobu Inoue 	case NI_QTYPE_SUPTYPES:
143933841545SHajimu UMEMOTO 	{
144033841545SHajimu UMEMOTO 		u_int32_t v;
144133841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
144233841545SHajimu UMEMOTO 		nni6->ni_flags = htons(0x0000);	/* raw bitmap */
144333841545SHajimu UMEMOTO 		/* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
144433841545SHajimu UMEMOTO 		v = (u_int32_t)htonl(0x0000000f);
144533841545SHajimu UMEMOTO 		bcopy(&v, nni6 + 1, sizeof(u_int32_t));
144682cd038dSYoshinobu Inoue 		break;
144733841545SHajimu UMEMOTO 	}
144882cd038dSYoshinobu Inoue 	case NI_QTYPE_FQDN:
144933841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
145082cd038dSYoshinobu Inoue 		fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
145106cd0a3fSHajimu UMEMOTO 		    sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
145282cd038dSYoshinobu Inoue 		nni6->ni_flags = 0; /* XXX: meaningless TTL */
145382cd038dSYoshinobu Inoue 		fqdn->ni_fqdn_ttl = 0;	/* ditto. */
1454686cdd19SJun-ichiro itojun Hagino 		/*
145576ca6f88SJamie Gritton 		 * XXX do we really have FQDN in hostname?
1456686cdd19SJun-ichiro itojun Hagino 		 */
145776ca6f88SJamie Gritton 		mtx_lock(&pr->pr_mtx);
1458c1f19219SJamie Gritton 		n->m_next = ni6_nametodns(pr->pr_hostname,
1459c1f19219SJamie Gritton 		    strlen(pr->pr_hostname), oldfqdn);
146076ca6f88SJamie Gritton 		mtx_unlock(&pr->pr_mtx);
1461686cdd19SJun-ichiro itojun Hagino 		if (n->m_next == NULL)
1462686cdd19SJun-ichiro itojun Hagino 			goto bad;
1463686cdd19SJun-ichiro itojun Hagino 		/* XXX we assume that n->m_next is not a chain */
1464686cdd19SJun-ichiro itojun Hagino 		if (n->m_next->m_next != NULL)
1465686cdd19SJun-ichiro itojun Hagino 			goto bad;
1466686cdd19SJun-ichiro itojun Hagino 		n->m_pkthdr.len += n->m_next->m_len;
146782cd038dSYoshinobu Inoue 		break;
146882cd038dSYoshinobu Inoue 	case NI_QTYPE_NODEADDR:
146982cd038dSYoshinobu Inoue 	{
147082cd038dSYoshinobu Inoue 		int lenlim, copied;
147182cd038dSYoshinobu Inoue 
147233841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
147333841545SHajimu UMEMOTO 		n->m_pkthdr.len = n->m_len =
147433841545SHajimu UMEMOTO 		    sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
147533841545SHajimu UMEMOTO 		lenlim = M_TRAILINGSPACE(n);
147682cd038dSYoshinobu Inoue 		copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
147782cd038dSYoshinobu Inoue 		/* XXX: reset mbuf length */
147882cd038dSYoshinobu Inoue 		n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
147982cd038dSYoshinobu Inoue 		    sizeof(struct icmp6_nodeinfo) + copied;
148082cd038dSYoshinobu Inoue 		break;
148182cd038dSYoshinobu Inoue 	}
148282cd038dSYoshinobu Inoue 	default:
148382cd038dSYoshinobu Inoue 		break;		/* XXX impossible! */
148482cd038dSYoshinobu Inoue 	}
148582cd038dSYoshinobu Inoue 
148682cd038dSYoshinobu Inoue 	nni6->ni_type = ICMP6_NI_REPLY;
1487686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
148882cd038dSYoshinobu Inoue 	return (n);
148982cd038dSYoshinobu Inoue 
149082cd038dSYoshinobu Inoue   bad:
1491686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
149282cd038dSYoshinobu Inoue 	if (n)
149382cd038dSYoshinobu Inoue 		m_freem(n);
149482cd038dSYoshinobu Inoue 	return (NULL);
149582cd038dSYoshinobu Inoue }
149682cd038dSYoshinobu Inoue 
149782cd038dSYoshinobu Inoue /*
1498686cdd19SJun-ichiro itojun Hagino  * make a mbuf with DNS-encoded string.  no compression support.
1499686cdd19SJun-ichiro itojun Hagino  *
1500686cdd19SJun-ichiro itojun Hagino  * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1501686cdd19SJun-ichiro itojun Hagino  * treated as truncated name (two \0 at the end).  this is a wild guess.
15021272577eSXin LI  *
15031272577eSXin LI  * old - return pascal string if non-zero
1504686cdd19SJun-ichiro itojun Hagino  */
1505686cdd19SJun-ichiro itojun Hagino static struct mbuf *
15061272577eSXin LI ni6_nametodns(const char *name, int namelen, int old)
1507686cdd19SJun-ichiro itojun Hagino {
1508686cdd19SJun-ichiro itojun Hagino 	struct mbuf *m;
1509686cdd19SJun-ichiro itojun Hagino 	char *cp, *ep;
1510686cdd19SJun-ichiro itojun Hagino 	const char *p, *q;
1511686cdd19SJun-ichiro itojun Hagino 	int i, len, nterm;
1512686cdd19SJun-ichiro itojun Hagino 
1513686cdd19SJun-ichiro itojun Hagino 	if (old)
1514686cdd19SJun-ichiro itojun Hagino 		len = namelen + 1;
1515686cdd19SJun-ichiro itojun Hagino 	else
1516686cdd19SJun-ichiro itojun Hagino 		len = MCLBYTES;
1517686cdd19SJun-ichiro itojun Hagino 
15187b07d1beSGleb Smirnoff 	/* Because MAXHOSTNAMELEN is usually 256, we use cluster mbuf. */
15197b07d1beSGleb Smirnoff 	if (len > MLEN)
15207b07d1beSGleb Smirnoff 		m = m_getcl(M_NOWAIT, MT_DATA, 0);
15217b07d1beSGleb Smirnoff 	else
15227b07d1beSGleb Smirnoff 		m = m_get(M_NOWAIT, MT_DATA);
15237b07d1beSGleb Smirnoff 	if (m == NULL)
1524686cdd19SJun-ichiro itojun Hagino 		goto fail;
1525686cdd19SJun-ichiro itojun Hagino 
1526686cdd19SJun-ichiro itojun Hagino 	if (old) {
1527686cdd19SJun-ichiro itojun Hagino 		m->m_len = len;
1528686cdd19SJun-ichiro itojun Hagino 		*mtod(m, char *) = namelen;
1529686cdd19SJun-ichiro itojun Hagino 		bcopy(name, mtod(m, char *) + 1, namelen);
1530686cdd19SJun-ichiro itojun Hagino 		return m;
1531686cdd19SJun-ichiro itojun Hagino 	} else {
1532686cdd19SJun-ichiro itojun Hagino 		m->m_len = 0;
1533686cdd19SJun-ichiro itojun Hagino 		cp = mtod(m, char *);
1534686cdd19SJun-ichiro itojun Hagino 		ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1535686cdd19SJun-ichiro itojun Hagino 
1536686cdd19SJun-ichiro itojun Hagino 		/* if not certain about my name, return empty buffer */
1537686cdd19SJun-ichiro itojun Hagino 		if (namelen == 0)
1538686cdd19SJun-ichiro itojun Hagino 			return m;
1539686cdd19SJun-ichiro itojun Hagino 
1540686cdd19SJun-ichiro itojun Hagino 		/*
1541686cdd19SJun-ichiro itojun Hagino 		 * guess if it looks like shortened hostname, or FQDN.
1542686cdd19SJun-ichiro itojun Hagino 		 * shortened hostname needs two trailing "\0".
1543686cdd19SJun-ichiro itojun Hagino 		 */
1544686cdd19SJun-ichiro itojun Hagino 		i = 0;
1545686cdd19SJun-ichiro itojun Hagino 		for (p = name; p < name + namelen; p++) {
1546686cdd19SJun-ichiro itojun Hagino 			if (*p && *p == '.')
1547686cdd19SJun-ichiro itojun Hagino 				i++;
1548686cdd19SJun-ichiro itojun Hagino 		}
1549686cdd19SJun-ichiro itojun Hagino 		if (i < 2)
1550686cdd19SJun-ichiro itojun Hagino 			nterm = 2;
1551686cdd19SJun-ichiro itojun Hagino 		else
1552686cdd19SJun-ichiro itojun Hagino 			nterm = 1;
1553686cdd19SJun-ichiro itojun Hagino 
1554686cdd19SJun-ichiro itojun Hagino 		p = name;
1555686cdd19SJun-ichiro itojun Hagino 		while (cp < ep && p < name + namelen) {
1556686cdd19SJun-ichiro itojun Hagino 			i = 0;
1557686cdd19SJun-ichiro itojun Hagino 			for (q = p; q < name + namelen && *q && *q != '.'; q++)
1558686cdd19SJun-ichiro itojun Hagino 				i++;
1559686cdd19SJun-ichiro itojun Hagino 			/* result does not fit into mbuf */
1560686cdd19SJun-ichiro itojun Hagino 			if (cp + i + 1 >= ep)
1561686cdd19SJun-ichiro itojun Hagino 				goto fail;
1562610be6ceSHajimu UMEMOTO 			/*
1563610be6ceSHajimu UMEMOTO 			 * DNS label length restriction, RFC1035 page 8.
1564610be6ceSHajimu UMEMOTO 			 * "i == 0" case is included here to avoid returning
1565610be6ceSHajimu UMEMOTO 			 * 0-length label on "foo..bar".
1566610be6ceSHajimu UMEMOTO 			 */
1567610be6ceSHajimu UMEMOTO 			if (i <= 0 || i >= 64)
1568686cdd19SJun-ichiro itojun Hagino 				goto fail;
1569686cdd19SJun-ichiro itojun Hagino 			*cp++ = i;
1570686cdd19SJun-ichiro itojun Hagino 			bcopy(p, cp, i);
1571686cdd19SJun-ichiro itojun Hagino 			cp += i;
1572686cdd19SJun-ichiro itojun Hagino 			p = q;
1573686cdd19SJun-ichiro itojun Hagino 			if (p < name + namelen && *p == '.')
1574686cdd19SJun-ichiro itojun Hagino 				p++;
1575686cdd19SJun-ichiro itojun Hagino 		}
1576686cdd19SJun-ichiro itojun Hagino 		/* termination */
1577686cdd19SJun-ichiro itojun Hagino 		if (cp + nterm >= ep)
1578686cdd19SJun-ichiro itojun Hagino 			goto fail;
1579686cdd19SJun-ichiro itojun Hagino 		while (nterm-- > 0)
1580686cdd19SJun-ichiro itojun Hagino 			*cp++ = '\0';
1581686cdd19SJun-ichiro itojun Hagino 		m->m_len = cp - mtod(m, char *);
1582686cdd19SJun-ichiro itojun Hagino 		return m;
1583686cdd19SJun-ichiro itojun Hagino 	}
1584686cdd19SJun-ichiro itojun Hagino 
1585686cdd19SJun-ichiro itojun Hagino 	panic("should not reach here");
1586686cdd19SJun-ichiro itojun Hagino 	/* NOTREACHED */
1587686cdd19SJun-ichiro itojun Hagino 
1588686cdd19SJun-ichiro itojun Hagino  fail:
1589686cdd19SJun-ichiro itojun Hagino 	if (m)
1590686cdd19SJun-ichiro itojun Hagino 		m_freem(m);
1591686cdd19SJun-ichiro itojun Hagino 	return NULL;
1592686cdd19SJun-ichiro itojun Hagino }
1593686cdd19SJun-ichiro itojun Hagino 
1594686cdd19SJun-ichiro itojun Hagino /*
1595686cdd19SJun-ichiro itojun Hagino  * check if two DNS-encoded string matches.  takes care of truncated
1596686cdd19SJun-ichiro itojun Hagino  * form (with \0\0 at the end).  no compression support.
159733841545SHajimu UMEMOTO  * XXX upper/lowercase match (see RFC2065)
1598686cdd19SJun-ichiro itojun Hagino  */
1599686cdd19SJun-ichiro itojun Hagino static int
16001272577eSXin LI ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1601686cdd19SJun-ichiro itojun Hagino {
1602686cdd19SJun-ichiro itojun Hagino 	const char *a0, *b0;
1603686cdd19SJun-ichiro itojun Hagino 	int l;
1604686cdd19SJun-ichiro itojun Hagino 
1605686cdd19SJun-ichiro itojun Hagino 	/* simplest case - need validation? */
1606686cdd19SJun-ichiro itojun Hagino 	if (alen == blen && bcmp(a, b, alen) == 0)
1607686cdd19SJun-ichiro itojun Hagino 		return 1;
1608686cdd19SJun-ichiro itojun Hagino 
1609686cdd19SJun-ichiro itojun Hagino 	a0 = a;
1610686cdd19SJun-ichiro itojun Hagino 	b0 = b;
1611686cdd19SJun-ichiro itojun Hagino 
1612686cdd19SJun-ichiro itojun Hagino 	/* termination is mandatory */
1613686cdd19SJun-ichiro itojun Hagino 	if (alen < 2 || blen < 2)
1614686cdd19SJun-ichiro itojun Hagino 		return 0;
1615686cdd19SJun-ichiro itojun Hagino 	if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1616686cdd19SJun-ichiro itojun Hagino 		return 0;
1617686cdd19SJun-ichiro itojun Hagino 	alen--;
1618686cdd19SJun-ichiro itojun Hagino 	blen--;
1619686cdd19SJun-ichiro itojun Hagino 
1620686cdd19SJun-ichiro itojun Hagino 	while (a - a0 < alen && b - b0 < blen) {
1621686cdd19SJun-ichiro itojun Hagino 		if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1622686cdd19SJun-ichiro itojun Hagino 			return 0;
1623686cdd19SJun-ichiro itojun Hagino 
1624686cdd19SJun-ichiro itojun Hagino 		if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1625686cdd19SJun-ichiro itojun Hagino 			return 0;
1626686cdd19SJun-ichiro itojun Hagino 		/* we don't support compression yet */
1627686cdd19SJun-ichiro itojun Hagino 		if (a[0] >= 64 || b[0] >= 64)
1628686cdd19SJun-ichiro itojun Hagino 			return 0;
1629686cdd19SJun-ichiro itojun Hagino 
1630686cdd19SJun-ichiro itojun Hagino 		/* truncated case */
1631686cdd19SJun-ichiro itojun Hagino 		if (a[0] == 0 && a - a0 == alen - 1)
1632686cdd19SJun-ichiro itojun Hagino 			return 1;
1633686cdd19SJun-ichiro itojun Hagino 		if (b[0] == 0 && b - b0 == blen - 1)
1634686cdd19SJun-ichiro itojun Hagino 			return 1;
1635686cdd19SJun-ichiro itojun Hagino 		if (a[0] == 0 || b[0] == 0)
1636686cdd19SJun-ichiro itojun Hagino 			return 0;
1637686cdd19SJun-ichiro itojun Hagino 
1638686cdd19SJun-ichiro itojun Hagino 		if (a[0] != b[0])
1639686cdd19SJun-ichiro itojun Hagino 			return 0;
1640686cdd19SJun-ichiro itojun Hagino 		l = a[0];
1641686cdd19SJun-ichiro itojun Hagino 		if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1642686cdd19SJun-ichiro itojun Hagino 			return 0;
1643686cdd19SJun-ichiro itojun Hagino 		if (bcmp(a + 1, b + 1, l) != 0)
1644686cdd19SJun-ichiro itojun Hagino 			return 0;
1645686cdd19SJun-ichiro itojun Hagino 
1646686cdd19SJun-ichiro itojun Hagino 		a += 1 + l;
1647686cdd19SJun-ichiro itojun Hagino 		b += 1 + l;
1648686cdd19SJun-ichiro itojun Hagino 	}
1649686cdd19SJun-ichiro itojun Hagino 
1650686cdd19SJun-ichiro itojun Hagino 	if (a - a0 == alen && b - b0 == blen)
1651686cdd19SJun-ichiro itojun Hagino 		return 1;
1652686cdd19SJun-ichiro itojun Hagino 	else
1653686cdd19SJun-ichiro itojun Hagino 		return 0;
1654686cdd19SJun-ichiro itojun Hagino }
1655686cdd19SJun-ichiro itojun Hagino 
1656686cdd19SJun-ichiro itojun Hagino /*
165782cd038dSYoshinobu Inoue  * calculate the number of addresses to be returned in the node info reply.
165882cd038dSYoshinobu Inoue  */
165982cd038dSYoshinobu Inoue static int
16601272577eSXin LI ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
16611272577eSXin LI     struct in6_addr *subj)
166282cd038dSYoshinobu Inoue {
166333841545SHajimu UMEMOTO 	struct ifnet *ifp;
166433841545SHajimu UMEMOTO 	struct in6_ifaddr *ifa6;
166533841545SHajimu UMEMOTO 	struct ifaddr *ifa;
166682cd038dSYoshinobu Inoue 	int addrs = 0, addrsofif, iffound = 0;
166733841545SHajimu UMEMOTO 	int niflags = ni6->ni_flags;
166833841545SHajimu UMEMOTO 
1669b8a6e03fSGleb Smirnoff 	NET_EPOCH_ASSERT();
1670b8a6e03fSGleb Smirnoff 
167133841545SHajimu UMEMOTO 	if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
167233841545SHajimu UMEMOTO 		switch (ni6->ni_code) {
167333841545SHajimu UMEMOTO 		case ICMP6_NI_SUBJ_IPV6:
167433841545SHajimu UMEMOTO 			if (subj == NULL) /* must be impossible... */
167533841545SHajimu UMEMOTO 				return (0);
167633841545SHajimu UMEMOTO 			break;
167733841545SHajimu UMEMOTO 		default:
167833841545SHajimu UMEMOTO 			/*
167933841545SHajimu UMEMOTO 			 * XXX: we only support IPv6 subject address for
168033841545SHajimu UMEMOTO 			 * this Qtype.
168133841545SHajimu UMEMOTO 			 */
168233841545SHajimu UMEMOTO 			return (0);
168333841545SHajimu UMEMOTO 		}
168433841545SHajimu UMEMOTO 	}
168582cd038dSYoshinobu Inoue 
16864f6c66ccSMatt Macy 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
168782cd038dSYoshinobu Inoue 		addrsofif = 0;
1688d7c5a620SMatt Macy 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
168982cd038dSYoshinobu Inoue 			if (ifa->ifa_addr->sa_family != AF_INET6)
169082cd038dSYoshinobu Inoue 				continue;
169182cd038dSYoshinobu Inoue 			ifa6 = (struct in6_ifaddr *)ifa;
169282cd038dSYoshinobu Inoue 
169333841545SHajimu UMEMOTO 			if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1694c66b5feaSHajimu UMEMOTO 			    IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
169582cd038dSYoshinobu Inoue 				iffound = 1;
169682cd038dSYoshinobu Inoue 
1697686cdd19SJun-ichiro itojun Hagino 			/*
1698686cdd19SJun-ichiro itojun Hagino 			 * IPv4-mapped addresses can only be returned by a
1699686cdd19SJun-ichiro itojun Hagino 			 * Node Information proxy, since they represent
1700686cdd19SJun-ichiro itojun Hagino 			 * addresses of IPv4-only nodes, which perforce do
1701686cdd19SJun-ichiro itojun Hagino 			 * not implement this protocol.
170233841545SHajimu UMEMOTO 			 * [icmp-name-lookups-07, Section 5.4]
1703686cdd19SJun-ichiro itojun Hagino 			 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1704686cdd19SJun-ichiro itojun Hagino 			 * this function at this moment.
1705686cdd19SJun-ichiro itojun Hagino 			 */
1706686cdd19SJun-ichiro itojun Hagino 
170782cd038dSYoshinobu Inoue 			/* What do we have to do about ::1? */
170882cd038dSYoshinobu Inoue 			switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
170982cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_LINKLOCAL:
171033841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
171133841545SHajimu UMEMOTO 					continue;
171282cd038dSYoshinobu Inoue 				break;
171382cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_SITELOCAL:
171433841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
171533841545SHajimu UMEMOTO 					continue;
171682cd038dSYoshinobu Inoue 				break;
171782cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_GLOBAL:
171833841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
171933841545SHajimu UMEMOTO 					continue;
172082cd038dSYoshinobu Inoue 				break;
172182cd038dSYoshinobu Inoue 			default:
172282cd038dSYoshinobu Inoue 				continue;
172382cd038dSYoshinobu Inoue 			}
172433841545SHajimu UMEMOTO 
172533841545SHajimu UMEMOTO 			/*
172633841545SHajimu UMEMOTO 			 * check if anycast is okay.
172733841545SHajimu UMEMOTO 			 * XXX: just experimental.  not in the spec.
172833841545SHajimu UMEMOTO 			 */
172933841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
173033841545SHajimu UMEMOTO 			    (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
173133841545SHajimu UMEMOTO 				continue; /* we need only unicast addresses */
173233841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1733603724d3SBjoern A. Zeeb 			    (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
173433841545SHajimu UMEMOTO 				continue;
173533841545SHajimu UMEMOTO 			}
173633841545SHajimu UMEMOTO 			addrsofif++; /* count the address */
173782cd038dSYoshinobu Inoue 		}
173882cd038dSYoshinobu Inoue 		if (iffound) {
173982cd038dSYoshinobu Inoue 			*ifpp = ifp;
174082cd038dSYoshinobu Inoue 			return (addrsofif);
174182cd038dSYoshinobu Inoue 		}
174282cd038dSYoshinobu Inoue 
174382cd038dSYoshinobu Inoue 		addrs += addrsofif;
174482cd038dSYoshinobu Inoue 	}
174582cd038dSYoshinobu Inoue 
174682cd038dSYoshinobu Inoue 	return (addrs);
174782cd038dSYoshinobu Inoue }
174882cd038dSYoshinobu Inoue 
174982cd038dSYoshinobu Inoue static int
17501272577eSXin LI ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
17511272577eSXin LI     struct ifnet *ifp0, int resid)
175282cd038dSYoshinobu Inoue {
175394e83133SJohn Baldwin 	struct ifnet *ifp;
175433841545SHajimu UMEMOTO 	struct in6_ifaddr *ifa6;
175533841545SHajimu UMEMOTO 	struct ifaddr *ifa;
175633841545SHajimu UMEMOTO 	struct ifnet *ifp_dep = NULL;
175733841545SHajimu UMEMOTO 	int copied = 0, allow_deprecated = 0;
175882cd038dSYoshinobu Inoue 	u_char *cp = (u_char *)(nni6 + 1);
175933841545SHajimu UMEMOTO 	int niflags = ni6->ni_flags;
176033841545SHajimu UMEMOTO 	u_int32_t ltime;
176182cd038dSYoshinobu Inoue 
1762b8a6e03fSGleb Smirnoff 	NET_EPOCH_ASSERT();
1763b8a6e03fSGleb Smirnoff 
176433841545SHajimu UMEMOTO 	if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
176582cd038dSYoshinobu Inoue 		return (0);	/* needless to copy */
176682cd038dSYoshinobu Inoue 
17674f6c66ccSMatt Macy 	ifp = ifp0 ? ifp0 : CK_STAILQ_FIRST(&V_ifnet);
176833841545SHajimu UMEMOTO   again:
17690527d333SHajimu UMEMOTO 
17704f6c66ccSMatt Macy 	for (; ifp; ifp = CK_STAILQ_NEXT(ifp, if_link)) {
1771d7c5a620SMatt Macy 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
177282cd038dSYoshinobu Inoue 			if (ifa->ifa_addr->sa_family != AF_INET6)
177382cd038dSYoshinobu Inoue 				continue;
177482cd038dSYoshinobu Inoue 			ifa6 = (struct in6_ifaddr *)ifa;
177582cd038dSYoshinobu Inoue 
177633841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
177733841545SHajimu UMEMOTO 			    allow_deprecated == 0) {
177833841545SHajimu UMEMOTO 				/*
177933841545SHajimu UMEMOTO 				 * prefererred address should be put before
178033841545SHajimu UMEMOTO 				 * deprecated addresses.
178133841545SHajimu UMEMOTO 				 */
178233841545SHajimu UMEMOTO 
178333841545SHajimu UMEMOTO 				/* record the interface for later search */
178433841545SHajimu UMEMOTO 				if (ifp_dep == NULL)
178533841545SHajimu UMEMOTO 					ifp_dep = ifp;
178633841545SHajimu UMEMOTO 
178782cd038dSYoshinobu Inoue 				continue;
178806cd0a3fSHajimu UMEMOTO 			} else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
178933841545SHajimu UMEMOTO 			    allow_deprecated != 0)
179033841545SHajimu UMEMOTO 				continue; /* we now collect deprecated addrs */
179182cd038dSYoshinobu Inoue 
179282cd038dSYoshinobu Inoue 			/* What do we have to do about ::1? */
179382cd038dSYoshinobu Inoue 			switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
179482cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_LINKLOCAL:
179533841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
179633841545SHajimu UMEMOTO 					continue;
179782cd038dSYoshinobu Inoue 				break;
179882cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_SITELOCAL:
179933841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
180033841545SHajimu UMEMOTO 					continue;
180182cd038dSYoshinobu Inoue 				break;
180282cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_GLOBAL:
180333841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
180433841545SHajimu UMEMOTO 					continue;
180582cd038dSYoshinobu Inoue 				break;
180682cd038dSYoshinobu Inoue 			default:
180782cd038dSYoshinobu Inoue 				continue;
180882cd038dSYoshinobu Inoue 			}
180982cd038dSYoshinobu Inoue 
181033841545SHajimu UMEMOTO 			/*
181133841545SHajimu UMEMOTO 			 * check if anycast is okay.
181233841545SHajimu UMEMOTO 			 * XXX: just experimental.  not in the spec.
181333841545SHajimu UMEMOTO 			 */
181433841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
181533841545SHajimu UMEMOTO 			    (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
181633841545SHajimu UMEMOTO 				continue;
181733841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1818603724d3SBjoern A. Zeeb 			    (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
181933841545SHajimu UMEMOTO 				continue;
182033841545SHajimu UMEMOTO 			}
182133841545SHajimu UMEMOTO 
182233841545SHajimu UMEMOTO 			/* now we can copy the address */
182333841545SHajimu UMEMOTO 			if (resid < sizeof(struct in6_addr) +
182433841545SHajimu UMEMOTO 			    sizeof(u_int32_t)) {
182582cd038dSYoshinobu Inoue 				/*
182682cd038dSYoshinobu Inoue 				 * We give up much more copy.
182782cd038dSYoshinobu Inoue 				 * Set the truncate flag and return.
182882cd038dSYoshinobu Inoue 				 */
182906cd0a3fSHajimu UMEMOTO 				nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
183082cd038dSYoshinobu Inoue 				return (copied);
183182cd038dSYoshinobu Inoue 			}
183233841545SHajimu UMEMOTO 
183333841545SHajimu UMEMOTO 			/*
183433841545SHajimu UMEMOTO 			 * Set the TTL of the address.
183533841545SHajimu UMEMOTO 			 * The TTL value should be one of the following
183633841545SHajimu UMEMOTO 			 * according to the specification:
183733841545SHajimu UMEMOTO 			 *
183833841545SHajimu UMEMOTO 			 * 1. The remaining lifetime of a DHCP lease on the
183933841545SHajimu UMEMOTO 			 *    address, or
184033841545SHajimu UMEMOTO 			 * 2. The remaining Valid Lifetime of a prefix from
184133841545SHajimu UMEMOTO 			 *    which the address was derived through Stateless
184233841545SHajimu UMEMOTO 			 *    Autoconfiguration.
184333841545SHajimu UMEMOTO 			 *
184433841545SHajimu UMEMOTO 			 * Note that we currently do not support stateful
184533841545SHajimu UMEMOTO 			 * address configuration by DHCPv6, so the former
184633841545SHajimu UMEMOTO 			 * case can't happen.
184733841545SHajimu UMEMOTO 			 */
184833841545SHajimu UMEMOTO 			if (ifa6->ia6_lifetime.ia6t_expire == 0)
184933841545SHajimu UMEMOTO 				ltime = ND6_INFINITE_LIFETIME;
185033841545SHajimu UMEMOTO 			else {
185133841545SHajimu UMEMOTO 				if (ifa6->ia6_lifetime.ia6t_expire >
18527d26db17SHiroki Sato 				    time_uptime)
18537d26db17SHiroki Sato 					ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
185433841545SHajimu UMEMOTO 				else
185533841545SHajimu UMEMOTO 					ltime = 0;
185633841545SHajimu UMEMOTO 			}
185733841545SHajimu UMEMOTO 
185833841545SHajimu UMEMOTO 			bcopy(&ltime, cp, sizeof(u_int32_t));
185933841545SHajimu UMEMOTO 			cp += sizeof(u_int32_t);
186033841545SHajimu UMEMOTO 
186133841545SHajimu UMEMOTO 			/* copy the address itself */
186282cd038dSYoshinobu Inoue 			bcopy(&ifa6->ia_addr.sin6_addr, cp,
186382cd038dSYoshinobu Inoue 			    sizeof(struct in6_addr));
18649a4f9608SHajimu UMEMOTO 			in6_clearscope((struct in6_addr *)cp); /* XXX */
186582cd038dSYoshinobu Inoue 			cp += sizeof(struct in6_addr);
186633841545SHajimu UMEMOTO 
186733841545SHajimu UMEMOTO 			resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
186806cd0a3fSHajimu UMEMOTO 			copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
186982cd038dSYoshinobu Inoue 		}
187082cd038dSYoshinobu Inoue 		if (ifp0)	/* we need search only on the specified IF */
187182cd038dSYoshinobu Inoue 			break;
187282cd038dSYoshinobu Inoue 	}
187382cd038dSYoshinobu Inoue 
187433841545SHajimu UMEMOTO 	if (allow_deprecated == 0 && ifp_dep != NULL) {
187533841545SHajimu UMEMOTO 		ifp = ifp_dep;
187633841545SHajimu UMEMOTO 		allow_deprecated = 1;
187733841545SHajimu UMEMOTO 
187833841545SHajimu UMEMOTO 		goto again;
187933841545SHajimu UMEMOTO 	}
188033841545SHajimu UMEMOTO 
188182cd038dSYoshinobu Inoue 	return (copied);
188282cd038dSYoshinobu Inoue }
188382cd038dSYoshinobu Inoue 
188482cd038dSYoshinobu Inoue /*
188582cd038dSYoshinobu Inoue  * XXX almost dup'ed code with rip6_input.
188682cd038dSYoshinobu Inoue  */
188782cd038dSYoshinobu Inoue static int
18881272577eSXin LI icmp6_rip6_input(struct mbuf **mp, int off)
188982cd038dSYoshinobu Inoue {
189082cd038dSYoshinobu Inoue 	struct mbuf *m = *mp;
189133841545SHajimu UMEMOTO 	struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
18920ecd976eSBjoern A. Zeeb 	struct inpcb *inp;
1893fc384fa5SBjoern A. Zeeb 	struct inpcb *last = NULL;
18949a4f9608SHajimu UMEMOTO 	struct sockaddr_in6 fromsa;
189582cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6;
189682cd038dSYoshinobu Inoue 	struct mbuf *opts = NULL;
189782cd038dSYoshinobu Inoue 
1898*cf377af6SGleb Smirnoff 	NET_EPOCH_ASSERT();
1899*cf377af6SGleb Smirnoff 
1900686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
190182cd038dSYoshinobu Inoue 	/* this is assumed to be safe. */
190282cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1903686cdd19SJun-ichiro itojun Hagino #else
1904686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1905686cdd19SJun-ichiro itojun Hagino 	if (icmp6 == NULL) {
1906686cdd19SJun-ichiro itojun Hagino 		/* m is already reclaimed */
190706cd0a3fSHajimu UMEMOTO 		return (IPPROTO_DONE);
1908686cdd19SJun-ichiro itojun Hagino 	}
1909686cdd19SJun-ichiro itojun Hagino #endif
191082cd038dSYoshinobu Inoue 
1911a1f7e5f8SHajimu UMEMOTO 	/*
1912a1f7e5f8SHajimu UMEMOTO 	 * XXX: the address may have embedded scope zone ID, which should be
1913a1f7e5f8SHajimu UMEMOTO 	 * hidden from applications.
1914a1f7e5f8SHajimu UMEMOTO 	 */
19159a4f9608SHajimu UMEMOTO 	bzero(&fromsa, sizeof(fromsa));
19169a4f9608SHajimu UMEMOTO 	fromsa.sin6_family = AF_INET6;
1917a1f7e5f8SHajimu UMEMOTO 	fromsa.sin6_len = sizeof(struct sockaddr_in6);
1918a1f7e5f8SHajimu UMEMOTO 	fromsa.sin6_addr = ip6->ip6_src;
1919a1f7e5f8SHajimu UMEMOTO 	if (sa6_recoverscope(&fromsa)) {
1920a1f7e5f8SHajimu UMEMOTO 		m_freem(m);
1921a1f7e5f8SHajimu UMEMOTO 		return (IPPROTO_DONE);
1922a1f7e5f8SHajimu UMEMOTO 	}
192382cd038dSYoshinobu Inoue 
19240ecd976eSBjoern A. Zeeb 	CK_LIST_FOREACH(inp, &V_ripcb, inp_list) {
19250ecd976eSBjoern A. Zeeb 		if ((inp->inp_vflag & INP_IPV6) == 0)
192682cd038dSYoshinobu Inoue 			continue;
19270ecd976eSBjoern A. Zeeb 		if (inp->inp_ip_p != IPPROTO_ICMPV6)
1928b11e21aeSAlexander Motin 			continue;
19290ecd976eSBjoern A. Zeeb 		if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
19300ecd976eSBjoern A. Zeeb 		   !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst))
1931b11e21aeSAlexander Motin 			continue;
19320ecd976eSBjoern A. Zeeb 		if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
19330ecd976eSBjoern A. Zeeb 		   !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src))
1934b11e21aeSAlexander Motin 			continue;
19350ecd976eSBjoern A. Zeeb 		INP_RLOCK(inp);
19360ecd976eSBjoern A. Zeeb 		if (__predict_false(inp->inp_flags2 & INP_FREED)) {
19370ecd976eSBjoern A. Zeeb 			INP_RUNLOCK(inp);
19386675bee8SBjoern A. Zeeb 			continue;
19396675bee8SBjoern A. Zeeb 		}
19402f1ff0cdSRobert Watson 		if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
19410ecd976eSBjoern A. Zeeb 		    inp->in6p_icmp6filt)) {
19420ecd976eSBjoern A. Zeeb 			INP_RUNLOCK(inp);
1943b11e21aeSAlexander Motin 			continue;
19446c5bbf5cSAlexander Motin 		}
1945aba53ef0SKip Macy 		if (last != NULL) {
1946657db3c8SHajimu UMEMOTO 			struct	mbuf *n = NULL;
1947657db3c8SHajimu UMEMOTO 
1948657db3c8SHajimu UMEMOTO 			/*
1949657db3c8SHajimu UMEMOTO 			 * Recent network drivers tend to allocate a single
1950657db3c8SHajimu UMEMOTO 			 * mbuf cluster, rather than to make a couple of
1951657db3c8SHajimu UMEMOTO 			 * mbufs without clusters.  Also, since the IPv6 code
1952657db3c8SHajimu UMEMOTO 			 * path tries to avoid m_pullup(), it is highly
1953657db3c8SHajimu UMEMOTO 			 * probable that we still have an mbuf cluster here
1954657db3c8SHajimu UMEMOTO 			 * even though the necessary length can be stored in an
1955657db3c8SHajimu UMEMOTO 			 * mbuf's internal buffer.
1956657db3c8SHajimu UMEMOTO 			 * Meanwhile, the default size of the receive socket
1957657db3c8SHajimu UMEMOTO 			 * buffer for raw sockets is not so large.  This means
1958657db3c8SHajimu UMEMOTO 			 * the possibility of packet loss is relatively higher
1959657db3c8SHajimu UMEMOTO 			 * than before.  To avoid this scenario, we copy the
1960657db3c8SHajimu UMEMOTO 			 * received data to a separate mbuf that does not use
1961657db3c8SHajimu UMEMOTO 			 * a cluster, if possible.
1962657db3c8SHajimu UMEMOTO 			 * XXX: it is better to copy the data after stripping
1963657db3c8SHajimu UMEMOTO 			 * intermediate headers.
1964657db3c8SHajimu UMEMOTO 			 */
1965657db3c8SHajimu UMEMOTO 			if ((m->m_flags & M_EXT) && m->m_next == NULL &&
1966657db3c8SHajimu UMEMOTO 			    m->m_len <= MHLEN) {
19677b07d1beSGleb Smirnoff 				n = m_get(M_NOWAIT, m->m_type);
1968657db3c8SHajimu UMEMOTO 				if (n != NULL) {
1969c543ec4eSGeorge V. Neville-Neil 					if (m_dup_pkthdr(n, m, M_NOWAIT)) {
1970c543ec4eSGeorge V. Neville-Neil 						bcopy(m->m_data, n->m_data,
1971c543ec4eSGeorge V. Neville-Neil 						      m->m_len);
1972657db3c8SHajimu UMEMOTO 						n->m_len = m->m_len;
1973c543ec4eSGeorge V. Neville-Neil 					} else {
1974c543ec4eSGeorge V. Neville-Neil 						m_free(n);
1975c543ec4eSGeorge V. Neville-Neil 						n = NULL;
1976c543ec4eSGeorge V. Neville-Neil 					}
1977657db3c8SHajimu UMEMOTO 				}
1978657db3c8SHajimu UMEMOTO 			}
1979657db3c8SHajimu UMEMOTO 			if (n != NULL ||
1980c3bef61eSKevin Lo 			    (n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != NULL) {
198197590249SBjoern A. Zeeb 				if (last->inp_flags & INP_CONTROLOPTS)
198211de19f4SHajimu UMEMOTO 					ip6_savecontrol(last, n, &opts);
198382cd038dSYoshinobu Inoue 				/* strip intermediate headers */
198482cd038dSYoshinobu Inoue 				m_adj(n, off);
1985fc384fa5SBjoern A. Zeeb 				SOCKBUF_LOCK(&last->inp_socket->so_rcv);
1986c9db0fadSRobert Watson 				if (sbappendaddr_locked(
1987fc384fa5SBjoern A. Zeeb 				    &last->inp_socket->so_rcv,
19889a4f9608SHajimu UMEMOTO 				    (struct sockaddr *)&fromsa, n, opts)
198906cd0a3fSHajimu UMEMOTO 				    == 0) {
199082cd038dSYoshinobu Inoue 					/* should notify about lost packet */
199182cd038dSYoshinobu Inoue 					m_freem(n);
199233841545SHajimu UMEMOTO 					if (opts) {
199382cd038dSYoshinobu Inoue 						m_freem(opts);
199433841545SHajimu UMEMOTO 					}
1995c9db0fadSRobert Watson 					SOCKBUF_UNLOCK(
1996fc384fa5SBjoern A. Zeeb 					    &last->inp_socket->so_rcv);
19974cc20ab1SSeigo Tanimura 				} else
1998fc384fa5SBjoern A. Zeeb 					sorwakeup_locked(last->inp_socket);
199982cd038dSYoshinobu Inoue 				opts = NULL;
200082cd038dSYoshinobu Inoue 			}
2001bb145f60SRobert Watson 			INP_RUNLOCK(last);
200282cd038dSYoshinobu Inoue 		}
20030ecd976eSBjoern A. Zeeb 		last = inp;
200482cd038dSYoshinobu Inoue 	}
2005aba53ef0SKip Macy 	if (last != NULL) {
200697590249SBjoern A. Zeeb 		if (last->inp_flags & INP_CONTROLOPTS)
200711de19f4SHajimu UMEMOTO 			ip6_savecontrol(last, m, &opts);
200882cd038dSYoshinobu Inoue 		/* strip intermediate headers */
200982cd038dSYoshinobu Inoue 		m_adj(m, off);
2010657db3c8SHajimu UMEMOTO 
2011657db3c8SHajimu UMEMOTO 		/* avoid using mbuf clusters if possible (see above) */
2012657db3c8SHajimu UMEMOTO 		if ((m->m_flags & M_EXT) && m->m_next == NULL &&
2013657db3c8SHajimu UMEMOTO 		    m->m_len <= MHLEN) {
2014657db3c8SHajimu UMEMOTO 			struct mbuf *n;
2015657db3c8SHajimu UMEMOTO 
20167b07d1beSGleb Smirnoff 			n = m_get(M_NOWAIT, m->m_type);
2017657db3c8SHajimu UMEMOTO 			if (n != NULL) {
2018c543ec4eSGeorge V. Neville-Neil 				if (m_dup_pkthdr(n, m, M_NOWAIT)) {
2019657db3c8SHajimu UMEMOTO 					bcopy(m->m_data, n->m_data, m->m_len);
2020657db3c8SHajimu UMEMOTO 					n->m_len = m->m_len;
2021657db3c8SHajimu UMEMOTO 
2022657db3c8SHajimu UMEMOTO 					m_freem(m);
2023657db3c8SHajimu UMEMOTO 					m = n;
2024c543ec4eSGeorge V. Neville-Neil 				} else {
2025c543ec4eSGeorge V. Neville-Neil 					m_freem(n);
2026c543ec4eSGeorge V. Neville-Neil 					n = NULL;
2027c543ec4eSGeorge V. Neville-Neil 				}
2028657db3c8SHajimu UMEMOTO 			}
2029657db3c8SHajimu UMEMOTO 		}
2030fc384fa5SBjoern A. Zeeb 		SOCKBUF_LOCK(&last->inp_socket->so_rcv);
2031fc384fa5SBjoern A. Zeeb 		if (sbappendaddr_locked(&last->inp_socket->so_rcv,
20329a4f9608SHajimu UMEMOTO 		    (struct sockaddr *)&fromsa, m, opts) == 0) {
203382cd038dSYoshinobu Inoue 			m_freem(m);
203482cd038dSYoshinobu Inoue 			if (opts)
203582cd038dSYoshinobu Inoue 				m_freem(opts);
2036fc384fa5SBjoern A. Zeeb 			SOCKBUF_UNLOCK(&last->inp_socket->so_rcv);
20374cc20ab1SSeigo Tanimura 		} else
2038fc384fa5SBjoern A. Zeeb 			sorwakeup_locked(last->inp_socket);
2039bb145f60SRobert Watson 		INP_RUNLOCK(last);
204082cd038dSYoshinobu Inoue 	} else {
204182cd038dSYoshinobu Inoue 		m_freem(m);
204233cde130SBruce M Simpson 		IP6STAT_DEC(ip6s_delivered);
204382cd038dSYoshinobu Inoue 	}
204482cd038dSYoshinobu Inoue 	return IPPROTO_DONE;
204582cd038dSYoshinobu Inoue }
204682cd038dSYoshinobu Inoue 
204782cd038dSYoshinobu Inoue /*
204882cd038dSYoshinobu Inoue  * Reflect the ip6 packet back to the source.
2049686cdd19SJun-ichiro itojun Hagino  * OFF points to the icmp6 header, counted from the top of the mbuf.
205082cd038dSYoshinobu Inoue  */
205182cd038dSYoshinobu Inoue void
20521272577eSXin LI icmp6_reflect(struct mbuf *m, size_t off)
205382cd038dSYoshinobu Inoue {
2054ab861e6cSAlexander V. Chernikov 	struct in6_addr src6, *srcp;
2055686cdd19SJun-ichiro itojun Hagino 	struct ip6_hdr *ip6;
205682cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6;
20578c0fec80SRobert Watson 	struct in6_ifaddr *ia = NULL;
20583e88eb90SAndrey V. Elsukov 	struct ifnet *outif = NULL;
2059686cdd19SJun-ichiro itojun Hagino 	int plen;
2060ab861e6cSAlexander V. Chernikov 	int type, code, hlim;
206182cd038dSYoshinobu Inoue 
2062686cdd19SJun-ichiro itojun Hagino 	/* too short to reflect */
2063686cdd19SJun-ichiro itojun Hagino 	if (off < sizeof(struct ip6_hdr)) {
206433841545SHajimu UMEMOTO 		nd6log((LOG_DEBUG,
206533841545SHajimu UMEMOTO 		    "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2066686cdd19SJun-ichiro itojun Hagino 		    (u_long)off, (u_long)sizeof(struct ip6_hdr),
206733841545SHajimu UMEMOTO 		    __FILE__, __LINE__));
2068686cdd19SJun-ichiro itojun Hagino 		goto bad;
2069686cdd19SJun-ichiro itojun Hagino 	}
2070686cdd19SJun-ichiro itojun Hagino 
207182cd038dSYoshinobu Inoue 	/*
207282cd038dSYoshinobu Inoue 	 * If there are extra headers between IPv6 and ICMPv6, strip
207382cd038dSYoshinobu Inoue 	 * off that header first.
207482cd038dSYoshinobu Inoue 	 */
2075686cdd19SJun-ichiro itojun Hagino #ifdef DIAGNOSTIC
2076686cdd19SJun-ichiro itojun Hagino 	if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2077686cdd19SJun-ichiro itojun Hagino 		panic("assumption failed in icmp6_reflect");
2078686cdd19SJun-ichiro itojun Hagino #endif
2079686cdd19SJun-ichiro itojun Hagino 	if (off > sizeof(struct ip6_hdr)) {
2080686cdd19SJun-ichiro itojun Hagino 		size_t l;
2081686cdd19SJun-ichiro itojun Hagino 		struct ip6_hdr nip6;
208282cd038dSYoshinobu Inoue 
2083686cdd19SJun-ichiro itojun Hagino 		l = off - sizeof(struct ip6_hdr);
2084686cdd19SJun-ichiro itojun Hagino 		m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2085686cdd19SJun-ichiro itojun Hagino 		m_adj(m, l);
2086686cdd19SJun-ichiro itojun Hagino 		l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2087686cdd19SJun-ichiro itojun Hagino 		if (m->m_len < l) {
2088686cdd19SJun-ichiro itojun Hagino 			if ((m = m_pullup(m, l)) == NULL)
2089686cdd19SJun-ichiro itojun Hagino 				return;
209082cd038dSYoshinobu Inoue 		}
2091686cdd19SJun-ichiro itojun Hagino 		bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2092686cdd19SJun-ichiro itojun Hagino 	} else /* off == sizeof(struct ip6_hdr) */ {
2093686cdd19SJun-ichiro itojun Hagino 		size_t l;
2094686cdd19SJun-ichiro itojun Hagino 		l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2095686cdd19SJun-ichiro itojun Hagino 		if (m->m_len < l) {
2096686cdd19SJun-ichiro itojun Hagino 			if ((m = m_pullup(m, l)) == NULL)
2097686cdd19SJun-ichiro itojun Hagino 				return;
209882cd038dSYoshinobu Inoue 		}
2099686cdd19SJun-ichiro itojun Hagino 	}
2100686cdd19SJun-ichiro itojun Hagino 	plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
210182cd038dSYoshinobu Inoue 	ip6 = mtod(m, struct ip6_hdr *);
210282cd038dSYoshinobu Inoue 	ip6->ip6_nxt = IPPROTO_ICMPV6;
210382cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)(ip6 + 1);
210482cd038dSYoshinobu Inoue 	type = icmp6->icmp6_type; /* keep type for statistics */
210582cd038dSYoshinobu Inoue 	code = icmp6->icmp6_code; /* ditto. */
2106ab861e6cSAlexander V. Chernikov 	hlim = 0;
2107ab861e6cSAlexander V. Chernikov 	srcp = NULL;
210882cd038dSYoshinobu Inoue 
210982cd038dSYoshinobu Inoue 	/*
211082cd038dSYoshinobu Inoue 	 * If the incoming packet was addressed directly to us (i.e. unicast),
211182cd038dSYoshinobu Inoue 	 * use dst as the src for the reply.
211206cd0a3fSHajimu UMEMOTO 	 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2113686cdd19SJun-ichiro itojun Hagino 	 * (for example) when we encounter an error while forwarding procedure
2114686cdd19SJun-ichiro itojun Hagino 	 * destined to a duplicated address of ours.
211582cd038dSYoshinobu Inoue 	 */
21163e88eb90SAndrey V. Elsukov 	if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
21173e88eb90SAndrey V. Elsukov 		ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */);
21183e88eb90SAndrey V. Elsukov 		if (ia != NULL && !(ia->ia6_flags &
2119ab861e6cSAlexander V. Chernikov 		    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
2120ab861e6cSAlexander V. Chernikov 			src6 = ia->ia_addr.sin6_addr;
2121ab861e6cSAlexander V. Chernikov 			srcp = &src6;
2122ab861e6cSAlexander V. Chernikov 
2123ab861e6cSAlexander V. Chernikov 			if (m->m_pkthdr.rcvif != NULL) {
2124ab861e6cSAlexander V. Chernikov 				/* XXX: This may not be the outgoing interface */
2125ab861e6cSAlexander V. Chernikov 				hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2126ab861e6cSAlexander V. Chernikov 			} else
2127ab861e6cSAlexander V. Chernikov 				hlim = V_ip6_defhlim;
2128ab861e6cSAlexander V. Chernikov 		}
2129ab861e6cSAlexander V. Chernikov 		if (ia != NULL)
2130ab861e6cSAlexander V. Chernikov 			ifa_free(&ia->ia_ifa);
213182cd038dSYoshinobu Inoue 	}
213282cd038dSYoshinobu Inoue 
213388d166bfSBjoern A. Zeeb 	if (srcp == NULL) {
2134601c0b8bSAlexander V. Chernikov 		int error;
2135601c0b8bSAlexander V. Chernikov 		struct in6_addr dst6;
2136601c0b8bSAlexander V. Chernikov 		uint32_t scopeid;
213733841545SHajimu UMEMOTO 
213882cd038dSYoshinobu Inoue 		/*
2139686cdd19SJun-ichiro itojun Hagino 		 * This case matches to multicasts, our anycast, or unicasts
214033841545SHajimu UMEMOTO 		 * that we do not own.  Select a source address based on the
214133841545SHajimu UMEMOTO 		 * source address of the erroneous packet.
214282cd038dSYoshinobu Inoue 		 */
21435a03e781SAndrey V. Elsukov 		in6_splitscope(&ip6->ip6_src, &dst6, &scopeid);
2144559b4296SAlan Somers 		error = in6_selectsrc_addr(M_GETFIB(m), &dst6,
2145601c0b8bSAlexander V. Chernikov 		    scopeid, NULL, &src6, &hlim);
2146a1f7e5f8SHajimu UMEMOTO 
2147601c0b8bSAlexander V. Chernikov 		if (error) {
21481d54aa3bSBjoern A. Zeeb 			char ip6buf[INET6_ADDRSTRLEN];
214933841545SHajimu UMEMOTO 			nd6log((LOG_DEBUG,
215033841545SHajimu UMEMOTO 			    "icmp6_reflect: source can't be determined: "
215133841545SHajimu UMEMOTO 			    "dst=%s, error=%d\n",
2152601c0b8bSAlexander V. Chernikov 			    ip6_sprintf(ip6buf, &ip6->ip6_dst), error));
215382cd038dSYoshinobu Inoue 			goto bad;
215433841545SHajimu UMEMOTO 		}
2155ab861e6cSAlexander V. Chernikov 		srcp = &src6;
215633841545SHajimu UMEMOTO 	}
21573e88eb90SAndrey V. Elsukov 	/*
21583e88eb90SAndrey V. Elsukov 	 * ip6_input() drops a packet if its src is multicast.
21593e88eb90SAndrey V. Elsukov 	 * So, the src is never multicast.
21603e88eb90SAndrey V. Elsukov 	 */
21613e88eb90SAndrey V. Elsukov 	ip6->ip6_dst = ip6->ip6_src;
216288d166bfSBjoern A. Zeeb 	ip6->ip6_src = *srcp;
216382cd038dSYoshinobu Inoue 	ip6->ip6_flow = 0;
2164686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2165686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc |= IPV6_VERSION;
216682cd038dSYoshinobu Inoue 	ip6->ip6_nxt = IPPROTO_ICMPV6;
2167ab861e6cSAlexander V. Chernikov 	ip6->ip6_hlim = hlim;
216882cd038dSYoshinobu Inoue 
216982cd038dSYoshinobu Inoue 	icmp6->icmp6_cksum = 0;
217082cd038dSYoshinobu Inoue 	icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
217182cd038dSYoshinobu Inoue 	    sizeof(struct ip6_hdr), plen);
217282cd038dSYoshinobu Inoue 
217382cd038dSYoshinobu Inoue 	/*
217433841545SHajimu UMEMOTO 	 * XXX option handling
217582cd038dSYoshinobu Inoue 	 */
217682cd038dSYoshinobu Inoue 
217782cd038dSYoshinobu Inoue 	m->m_flags &= ~(M_BCAST|M_MCAST);
2178849eeaa5SAndrey V. Elsukov 	m->m_pkthdr.rcvif = NULL;
21795d846453SSam Leffler 	ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
218082cd038dSYoshinobu Inoue 	if (outif)
218182cd038dSYoshinobu Inoue 		icmp6_ifoutstat_inc(outif, type, code);
218282cd038dSYoshinobu Inoue 
218382cd038dSYoshinobu Inoue 	return;
218482cd038dSYoshinobu Inoue 
218582cd038dSYoshinobu Inoue  bad:
218682cd038dSYoshinobu Inoue 	m_freem(m);
218782cd038dSYoshinobu Inoue 	return;
218882cd038dSYoshinobu Inoue }
218982cd038dSYoshinobu Inoue 
219082cd038dSYoshinobu Inoue void
21911272577eSXin LI icmp6_fasttimo(void)
219282cd038dSYoshinobu Inoue {
2193686cdd19SJun-ichiro itojun Hagino 
219433cde130SBruce M Simpson 	mld_fasttimo();
219533cde130SBruce M Simpson }
219633cde130SBruce M Simpson 
219733cde130SBruce M Simpson void
219833cde130SBruce M Simpson icmp6_slowtimo(void)
219933cde130SBruce M Simpson {
220033cde130SBruce M Simpson 
220133cde130SBruce M Simpson 	mld_slowtimo();
220282cd038dSYoshinobu Inoue }
220382cd038dSYoshinobu Inoue 
220482cd038dSYoshinobu Inoue static const char *
22051272577eSXin LI icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
22061272577eSXin LI     struct in6_addr *tgt6)
220782cd038dSYoshinobu Inoue {
220882cd038dSYoshinobu Inoue 	static char buf[1024];
22091d54aa3bSBjoern A. Zeeb 	char ip6bufs[INET6_ADDRSTRLEN];
22101d54aa3bSBjoern A. Zeeb 	char ip6bufd[INET6_ADDRSTRLEN];
22111d54aa3bSBjoern A. Zeeb 	char ip6buft[INET6_ADDRSTRLEN];
221282cd038dSYoshinobu Inoue 	snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
22131d54aa3bSBjoern A. Zeeb 	    ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
22141d54aa3bSBjoern A. Zeeb 	    ip6_sprintf(ip6buft, tgt6));
221582cd038dSYoshinobu Inoue 	return buf;
221682cd038dSYoshinobu Inoue }
221782cd038dSYoshinobu Inoue 
221882cd038dSYoshinobu Inoue void
22191272577eSXin LI icmp6_redirect_input(struct mbuf *m, int off)
222082cd038dSYoshinobu Inoue {
22212cb64cb2SGeorge V. Neville-Neil 	struct ifnet *ifp;
2222503f4e47SBjoern A. Zeeb 	struct ip6_hdr *ip6;
2223686cdd19SJun-ichiro itojun Hagino 	struct nd_redirect *nd_rd;
2224503f4e47SBjoern A. Zeeb 	struct in6_addr src6;
2225686cdd19SJun-ichiro itojun Hagino 	struct in6_addr redtgt6;
2226686cdd19SJun-ichiro itojun Hagino 	struct in6_addr reddst6;
222782cd038dSYoshinobu Inoue 	union nd_opts ndopts;
22281d54aa3bSBjoern A. Zeeb 	char ip6buf[INET6_ADDRSTRLEN];
2229503f4e47SBjoern A. Zeeb 	char *lladdr;
2230503f4e47SBjoern A. Zeeb 	int icmp6len, is_onlink, is_router, lladdrlen;
223182cd038dSYoshinobu Inoue 
223237c1ff48SGleb Smirnoff 	M_ASSERTPKTHDR(m);
223337c1ff48SGleb Smirnoff 	KASSERT(m->m_pkthdr.rcvif != NULL, ("%s: no rcvif", __func__));
22342cb64cb2SGeorge V. Neville-Neil 
223582cd038dSYoshinobu Inoue 	/* XXX if we are router, we don't update route by icmp6 redirect */
2236603724d3SBjoern A. Zeeb 	if (V_ip6_forwarding)
2237686cdd19SJun-ichiro itojun Hagino 		goto freeit;
2238603724d3SBjoern A. Zeeb 	if (!V_icmp6_rediraccept)
2239686cdd19SJun-ichiro itojun Hagino 		goto freeit;
2240686cdd19SJun-ichiro itojun Hagino 
2241a4061289SAndrey V. Elsukov 	/* RFC 6980: Nodes MUST silently ignore fragments */
2242a4061289SAndrey V. Elsukov 	if(m->m_flags & M_FRAGMENTED)
2243a4061289SAndrey V. Elsukov 		goto freeit;
2244a4061289SAndrey V. Elsukov 
2245503f4e47SBjoern A. Zeeb 	ip6 = mtod(m, struct ip6_hdr *);
2246503f4e47SBjoern A. Zeeb 	icmp6len = ntohs(ip6->ip6_plen);
2247686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
2248686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_CHECK(m, off, icmp6len,);
2249686cdd19SJun-ichiro itojun Hagino 	nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2250686cdd19SJun-ichiro itojun Hagino #else
2251686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2252686cdd19SJun-ichiro itojun Hagino 	if (nd_rd == NULL) {
2253e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
225482cd038dSYoshinobu Inoue 		return;
2255686cdd19SJun-ichiro itojun Hagino 	}
2256686cdd19SJun-ichiro itojun Hagino #endif
2257503f4e47SBjoern A. Zeeb 
2258503f4e47SBjoern A. Zeeb 	ifp = m->m_pkthdr.rcvif;
2259686cdd19SJun-ichiro itojun Hagino 	redtgt6 = nd_rd->nd_rd_target;
2260686cdd19SJun-ichiro itojun Hagino 	reddst6 = nd_rd->nd_rd_dst;
226182cd038dSYoshinobu Inoue 
2262503f4e47SBjoern A. Zeeb 	if (in6_setscope(&redtgt6, ifp, NULL) ||
2263503f4e47SBjoern A. Zeeb 	    in6_setscope(&reddst6, ifp, NULL)) {
2264a1f7e5f8SHajimu UMEMOTO 		goto freeit;
2265a1f7e5f8SHajimu UMEMOTO 	}
226682cd038dSYoshinobu Inoue 
226782cd038dSYoshinobu Inoue 	/* validation */
2268503f4e47SBjoern A. Zeeb 	src6 = ip6->ip6_src;
226982cd038dSYoshinobu Inoue 	if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
227033841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
227182cd038dSYoshinobu Inoue 		    "ICMP6 redirect sent from %s rejected; "
227206cd0a3fSHajimu UMEMOTO 		    "must be from linklocal\n",
22731d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6buf, &src6)));
227433841545SHajimu UMEMOTO 		goto bad;
227582cd038dSYoshinobu Inoue 	}
227682cd038dSYoshinobu Inoue 	if (ip6->ip6_hlim != 255) {
227733841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
227882cd038dSYoshinobu Inoue 		    "ICMP6 redirect sent from %s rejected; "
227982cd038dSYoshinobu Inoue 		    "hlim=%d (must be 255)\n",
22801d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
228133841545SHajimu UMEMOTO 		goto bad;
228282cd038dSYoshinobu Inoue 	}
228382cd038dSYoshinobu Inoue     {
228482cd038dSYoshinobu Inoue 	/* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
22859977be4aSAlexander V. Chernikov 	struct nhop6_basic nh6;
22869977be4aSAlexander V. Chernikov 	struct in6_addr kdst;
22879977be4aSAlexander V. Chernikov 	uint32_t scopeid;
228882cd038dSYoshinobu Inoue 
22899977be4aSAlexander V. Chernikov 	in6_splitscope(&reddst6, &kdst, &scopeid);
2290559b4296SAlan Somers 	if (fib6_lookup_nh_basic(ifp->if_fib, &kdst, scopeid, 0, 0,&nh6)==0){
22919977be4aSAlexander V. Chernikov 		if ((nh6.nh_flags & NHF_GATEWAY) == 0) {
229233841545SHajimu UMEMOTO 			nd6log((LOG_ERR,
2293deebc913SHajimu UMEMOTO 			    "ICMP6 redirect rejected; no route "
2294deebc913SHajimu UMEMOTO 			    "with inet6 gateway found for redirect dst: %s\n",
229533841545SHajimu UMEMOTO 			    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
229633841545SHajimu UMEMOTO 			goto bad;
2297deebc913SHajimu UMEMOTO 		}
2298deebc913SHajimu UMEMOTO 
229943105e58SEric van Gyzen 		/*
230043105e58SEric van Gyzen 		 * Embed scope zone id into next hop address, since
230143105e58SEric van Gyzen 		 * fib6_lookup_nh_basic() returns address without embedded
230243105e58SEric van Gyzen 		 * scope zone id.
230343105e58SEric van Gyzen 		 */
230443105e58SEric van Gyzen 		if (in6_setscope(&nh6.nh_addr, m->m_pkthdr.rcvif, NULL))
230543105e58SEric van Gyzen 			goto freeit;
230643105e58SEric van Gyzen 
23079977be4aSAlexander V. Chernikov 		if (IN6_ARE_ADDR_EQUAL(&src6, &nh6.nh_addr) == 0) {
230833841545SHajimu UMEMOTO 			nd6log((LOG_ERR,
230982cd038dSYoshinobu Inoue 			    "ICMP6 redirect rejected; "
231082cd038dSYoshinobu Inoue 			    "not equal to gw-for-src=%s (must be same): "
231182cd038dSYoshinobu Inoue 			    "%s\n",
23129977be4aSAlexander V. Chernikov 			    ip6_sprintf(ip6buf, &nh6.nh_addr),
231333841545SHajimu UMEMOTO 			    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
231433841545SHajimu UMEMOTO 			goto bad;
231582cd038dSYoshinobu Inoue 		}
231682cd038dSYoshinobu Inoue 	} else {
231733841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
231882cd038dSYoshinobu Inoue 		    "ICMP6 redirect rejected; "
231982cd038dSYoshinobu Inoue 		    "no route found for redirect dst: %s\n",
232033841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
232133841545SHajimu UMEMOTO 		goto bad;
232282cd038dSYoshinobu Inoue 	}
232382cd038dSYoshinobu Inoue     }
232482cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
232533841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
232682cd038dSYoshinobu Inoue 		    "ICMP6 redirect rejected; "
232782cd038dSYoshinobu Inoue 		    "redirect dst must be unicast: %s\n",
232833841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
232933841545SHajimu UMEMOTO 		goto bad;
233082cd038dSYoshinobu Inoue 	}
233182cd038dSYoshinobu Inoue 
233282cd038dSYoshinobu Inoue 	is_router = is_onlink = 0;
233382cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
233482cd038dSYoshinobu Inoue 		is_router = 1;	/* router case */
233582cd038dSYoshinobu Inoue 	if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
233682cd038dSYoshinobu Inoue 		is_onlink = 1;	/* on-link destination case */
233782cd038dSYoshinobu Inoue 	if (!is_router && !is_onlink) {
233833841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
233982cd038dSYoshinobu Inoue 		    "ICMP6 redirect rejected; "
234082cd038dSYoshinobu Inoue 		    "neither router case nor onlink case: %s\n",
234133841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
234233841545SHajimu UMEMOTO 		goto bad;
234382cd038dSYoshinobu Inoue 	}
234482cd038dSYoshinobu Inoue 
234582cd038dSYoshinobu Inoue 	icmp6len -= sizeof(*nd_rd);
234682cd038dSYoshinobu Inoue 	nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
234782cd038dSYoshinobu Inoue 	if (nd6_options(&ndopts) < 0) {
234837c1ff48SGleb Smirnoff 		nd6log((LOG_INFO, "%s: invalid ND option, rejected: %s\n",
234937c1ff48SGleb Smirnoff 		    __func__, icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
235033841545SHajimu UMEMOTO 		/* nd6_options have incremented stats */
2351686cdd19SJun-ichiro itojun Hagino 		goto freeit;
235282cd038dSYoshinobu Inoue 	}
235382cd038dSYoshinobu Inoue 
2354503f4e47SBjoern A. Zeeb 	lladdr = NULL;
2355503f4e47SBjoern A. Zeeb 	lladdrlen = 0;
235682cd038dSYoshinobu Inoue 	if (ndopts.nd_opts_tgt_lladdr) {
235782cd038dSYoshinobu Inoue 		lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
235882cd038dSYoshinobu Inoue 		lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
235982cd038dSYoshinobu Inoue 	}
236082cd038dSYoshinobu Inoue 
236182cd038dSYoshinobu Inoue 	if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
236237c1ff48SGleb Smirnoff 		nd6log((LOG_INFO, "%s: lladdrlen mismatch for %s "
236382cd038dSYoshinobu Inoue 		    "(if %d, icmp6 packet %d): %s\n",
236437c1ff48SGleb Smirnoff 		    __func__, ip6_sprintf(ip6buf, &redtgt6),
23651d54aa3bSBjoern A. Zeeb 		    ifp->if_addrlen, lladdrlen - 2,
236633841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
236733841545SHajimu UMEMOTO 		goto bad;
236882cd038dSYoshinobu Inoue 	}
236982cd038dSYoshinobu Inoue 
2370bfbc08b8SBjoern A. Zeeb 	/* Validation passed. */
2371bfbc08b8SBjoern A. Zeeb 
237282cd038dSYoshinobu Inoue 	/* RFC 2461 8.3 */
237382cd038dSYoshinobu Inoue 	nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
237482cd038dSYoshinobu Inoue 	    is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
237582cd038dSYoshinobu Inoue 
237617a03656SEric van Gyzen 	/*
237717a03656SEric van Gyzen 	 * Install a gateway route in the better-router case or an interface
237817a03656SEric van Gyzen 	 * route in the on-link-destination case.
237917a03656SEric van Gyzen 	 */
238017a03656SEric van Gyzen 	{
238182cd038dSYoshinobu Inoue 		struct sockaddr_in6 sdst;
238282cd038dSYoshinobu Inoue 		struct sockaddr_in6 sgw;
238382cd038dSYoshinobu Inoue 		struct sockaddr_in6 ssrc;
238417a03656SEric van Gyzen 		struct sockaddr *gw;
238517a03656SEric van Gyzen 		int rt_flags;
238681d5d46bSBjoern A. Zeeb 		u_int fibnum;
238782cd038dSYoshinobu Inoue 
238882cd038dSYoshinobu Inoue 		bzero(&sdst, sizeof(sdst));
238982cd038dSYoshinobu Inoue 		bzero(&ssrc, sizeof(ssrc));
239017a03656SEric van Gyzen 		sdst.sin6_family = ssrc.sin6_family = AF_INET6;
239117a03656SEric van Gyzen 		sdst.sin6_len = ssrc.sin6_len = sizeof(struct sockaddr_in6);
239282cd038dSYoshinobu Inoue 		bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
239382cd038dSYoshinobu Inoue 		bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
239417a03656SEric van Gyzen 		rt_flags = RTF_HOST;
239517a03656SEric van Gyzen 		if (is_router) {
239617a03656SEric van Gyzen 			bzero(&sgw, sizeof(sgw));
239717a03656SEric van Gyzen 			sgw.sin6_family = AF_INET6;
239817a03656SEric van Gyzen 			sgw.sin6_len = sizeof(struct sockaddr_in6);
239917a03656SEric van Gyzen 			bcopy(&redtgt6, &sgw.sin6_addr,
240017a03656SEric van Gyzen 				sizeof(struct in6_addr));
240117a03656SEric van Gyzen 			gw = (struct sockaddr *)&sgw;
240217a03656SEric van Gyzen 			rt_flags |= RTF_GATEWAY;
240317a03656SEric van Gyzen 		} else
240417a03656SEric van Gyzen 			gw = ifp->if_addr->ifa_addr;
240581d5d46bSBjoern A. Zeeb 		for (fibnum = 0; fibnum < rt_numfibs; fibnum++)
240617a03656SEric van Gyzen 			in6_rtredirect((struct sockaddr *)&sdst, gw,
240717a03656SEric van Gyzen 			    (struct sockaddr *)NULL, rt_flags,
240817a03656SEric van Gyzen 			    (struct sockaddr *)&ssrc, fibnum);
240982cd038dSYoshinobu Inoue 	}
241082cd038dSYoshinobu Inoue 	/* finally update cached route in each socket via pfctlinput */
241182cd038dSYoshinobu Inoue     {
241282cd038dSYoshinobu Inoue 	struct sockaddr_in6 sdst;
241382cd038dSYoshinobu Inoue 
241482cd038dSYoshinobu Inoue 	bzero(&sdst, sizeof(sdst));
241582cd038dSYoshinobu Inoue 	sdst.sin6_family = AF_INET6;
241682cd038dSYoshinobu Inoue 	sdst.sin6_len = sizeof(struct sockaddr_in6);
241782cd038dSYoshinobu Inoue 	bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
241882cd038dSYoshinobu Inoue 	pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
241982cd038dSYoshinobu Inoue     }
2420686cdd19SJun-ichiro itojun Hagino 
2421686cdd19SJun-ichiro itojun Hagino  freeit:
2422686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
242333841545SHajimu UMEMOTO 	return;
242433841545SHajimu UMEMOTO 
242533841545SHajimu UMEMOTO  bad:
2426e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_badredirect);
242733841545SHajimu UMEMOTO 	m_freem(m);
242882cd038dSYoshinobu Inoue }
242982cd038dSYoshinobu Inoue 
243082cd038dSYoshinobu Inoue void
24311272577eSXin LI icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
243282cd038dSYoshinobu Inoue {
243382cd038dSYoshinobu Inoue 	struct ifnet *ifp;	/* my outgoing interface */
243482cd038dSYoshinobu Inoue 	struct in6_addr *ifp_ll6;
243582cd038dSYoshinobu Inoue 	struct in6_addr *router_ll6;
243682cd038dSYoshinobu Inoue 	struct ip6_hdr *sip6;	/* m0 as struct ip6_hdr */
243782cd038dSYoshinobu Inoue 	struct mbuf *m = NULL;	/* newly allocated one */
24381db8d1f8SAna Kukec 	struct m_tag *mtag;
243982cd038dSYoshinobu Inoue 	struct ip6_hdr *ip6;	/* m as struct ip6_hdr */
244082cd038dSYoshinobu Inoue 	struct nd_redirect *nd_rd;
244156c423b0SKip Macy 	struct llentry *ln = NULL;
244282cd038dSYoshinobu Inoue 	size_t maxlen;
244382cd038dSYoshinobu Inoue 	u_char *p;
244482cd038dSYoshinobu Inoue 	struct ifnet *outif = NULL;
2445686cdd19SJun-ichiro itojun Hagino 	struct sockaddr_in6 src_sa;
2446686cdd19SJun-ichiro itojun Hagino 
244749dc650cSAndrey V. Elsukov 	icmp6_errcount(ND_REDIRECT, 0);
244882cd038dSYoshinobu Inoue 
244982cd038dSYoshinobu Inoue 	/* if we are not router, we don't send icmp6 redirect */
2450603724d3SBjoern A. Zeeb 	if (!V_ip6_forwarding)
245182cd038dSYoshinobu Inoue 		goto fail;
245282cd038dSYoshinobu Inoue 
245382cd038dSYoshinobu Inoue 	/* sanity check */
245482cd038dSYoshinobu Inoue 	if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
245582cd038dSYoshinobu Inoue 		goto fail;
245682cd038dSYoshinobu Inoue 
245782cd038dSYoshinobu Inoue 	/*
245882cd038dSYoshinobu Inoue 	 * Address check:
245982cd038dSYoshinobu Inoue 	 *  the source address must identify a neighbor, and
246082cd038dSYoshinobu Inoue 	 *  the destination address must not be a multicast address
246182cd038dSYoshinobu Inoue 	 *  [RFC 2461, sec 8.2]
246282cd038dSYoshinobu Inoue 	 */
246382cd038dSYoshinobu Inoue 	sip6 = mtod(m0, struct ip6_hdr *);
2464686cdd19SJun-ichiro itojun Hagino 	bzero(&src_sa, sizeof(src_sa));
2465686cdd19SJun-ichiro itojun Hagino 	src_sa.sin6_family = AF_INET6;
2466686cdd19SJun-ichiro itojun Hagino 	src_sa.sin6_len = sizeof(src_sa);
2467686cdd19SJun-ichiro itojun Hagino 	src_sa.sin6_addr = sip6->ip6_src;
2468686cdd19SJun-ichiro itojun Hagino 	if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
246982cd038dSYoshinobu Inoue 		goto fail;
247082cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
247182cd038dSYoshinobu Inoue 		goto fail;	/* what should we do here? */
247282cd038dSYoshinobu Inoue 
247382cd038dSYoshinobu Inoue 	/* rate limit */
247482cd038dSYoshinobu Inoue 	if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
247582cd038dSYoshinobu Inoue 		goto fail;
247682cd038dSYoshinobu Inoue 
247782cd038dSYoshinobu Inoue 	/*
247882cd038dSYoshinobu Inoue 	 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
247982cd038dSYoshinobu Inoue 	 * we almost always ask for an mbuf cluster for simplicity.
248082cd038dSYoshinobu Inoue 	 * (MHLEN < IPV6_MMTU is almost always true)
248182cd038dSYoshinobu Inoue 	 */
2482686cdd19SJun-ichiro itojun Hagino #if IPV6_MMTU >= MCLBYTES
2483686cdd19SJun-ichiro itojun Hagino # error assumption failed about IPV6_MMTU and MCLBYTES
2484686cdd19SJun-ichiro itojun Hagino #endif
24857b07d1beSGleb Smirnoff 	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
24867b07d1beSGleb Smirnoff 	if (m == NULL)
248782cd038dSYoshinobu Inoue 		goto fail;
248881d5d46bSBjoern A. Zeeb 	M_SETFIB(m, rt->rt_fibnum);
248933841545SHajimu UMEMOTO 	maxlen = M_TRAILINGSPACE(m);
249082cd038dSYoshinobu Inoue 	maxlen = min(IPV6_MMTU, maxlen);
249182cd038dSYoshinobu Inoue 	/* just for safety */
2492686cdd19SJun-ichiro itojun Hagino 	if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2493686cdd19SJun-ichiro itojun Hagino 	    ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
249482cd038dSYoshinobu Inoue 		goto fail;
2495686cdd19SJun-ichiro itojun Hagino 	}
249682cd038dSYoshinobu Inoue 
249782cd038dSYoshinobu Inoue 	{
249882cd038dSYoshinobu Inoue 		/* get ip6 linklocal address for ifp(my outgoing interface). */
2499686cdd19SJun-ichiro itojun Hagino 		struct in6_ifaddr *ia;
2500686cdd19SJun-ichiro itojun Hagino 		if ((ia = in6ifa_ifpforlinklocal(ifp,
2501686cdd19SJun-ichiro itojun Hagino 						 IN6_IFF_NOTREADY|
2502686cdd19SJun-ichiro itojun Hagino 						 IN6_IFF_ANYCAST)) == NULL)
250382cd038dSYoshinobu Inoue 			goto fail;
250482cd038dSYoshinobu Inoue 		ifp_ll6 = &ia->ia_addr.sin6_addr;
25058c0fec80SRobert Watson 		/* XXXRW: reference released prematurely. */
25068c0fec80SRobert Watson 		ifa_free(&ia->ia_ifa);
250782cd038dSYoshinobu Inoue 	}
250882cd038dSYoshinobu Inoue 
250982cd038dSYoshinobu Inoue 	/* get ip6 linklocal address for the router. */
251082cd038dSYoshinobu Inoue 	if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
251182cd038dSYoshinobu Inoue 		struct sockaddr_in6 *sin6;
251282cd038dSYoshinobu Inoue 		sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
251382cd038dSYoshinobu Inoue 		router_ll6 = &sin6->sin6_addr;
251482cd038dSYoshinobu Inoue 		if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
251582cd038dSYoshinobu Inoue 			router_ll6 = (struct in6_addr *)NULL;
251682cd038dSYoshinobu Inoue 	} else
251782cd038dSYoshinobu Inoue 		router_ll6 = (struct in6_addr *)NULL;
251882cd038dSYoshinobu Inoue 
251982cd038dSYoshinobu Inoue 	/* ip6 */
252082cd038dSYoshinobu Inoue 	ip6 = mtod(m, struct ip6_hdr *);
252182cd038dSYoshinobu Inoue 	ip6->ip6_flow = 0;
2522686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2523686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc |= IPV6_VERSION;
252482cd038dSYoshinobu Inoue 	/* ip6->ip6_plen will be set later */
252582cd038dSYoshinobu Inoue 	ip6->ip6_nxt = IPPROTO_ICMPV6;
252682cd038dSYoshinobu Inoue 	ip6->ip6_hlim = 255;
252782cd038dSYoshinobu Inoue 	/* ip6->ip6_src must be linklocal addr for my outgoing if. */
252882cd038dSYoshinobu Inoue 	bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
252982cd038dSYoshinobu Inoue 	bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
253082cd038dSYoshinobu Inoue 
253182cd038dSYoshinobu Inoue 	/* ND Redirect */
253282cd038dSYoshinobu Inoue 	nd_rd = (struct nd_redirect *)(ip6 + 1);
253382cd038dSYoshinobu Inoue 	nd_rd->nd_rd_type = ND_REDIRECT;
253482cd038dSYoshinobu Inoue 	nd_rd->nd_rd_code = 0;
253582cd038dSYoshinobu Inoue 	nd_rd->nd_rd_reserved = 0;
253682cd038dSYoshinobu Inoue 	if (rt->rt_flags & RTF_GATEWAY) {
253782cd038dSYoshinobu Inoue 		/*
253882cd038dSYoshinobu Inoue 		 * nd_rd->nd_rd_target must be a link-local address in
253982cd038dSYoshinobu Inoue 		 * better router cases.
254082cd038dSYoshinobu Inoue 		 */
254182cd038dSYoshinobu Inoue 		if (!router_ll6)
254282cd038dSYoshinobu Inoue 			goto fail;
254382cd038dSYoshinobu Inoue 		bcopy(router_ll6, &nd_rd->nd_rd_target,
254482cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_target));
254582cd038dSYoshinobu Inoue 		bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
254682cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_dst));
254782cd038dSYoshinobu Inoue 	} else {
254882cd038dSYoshinobu Inoue 		/* make sure redtgt == reddst */
254982cd038dSYoshinobu Inoue 		bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
255082cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_target));
255182cd038dSYoshinobu Inoue 		bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
255282cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_dst));
255382cd038dSYoshinobu Inoue 	}
255482cd038dSYoshinobu Inoue 
255582cd038dSYoshinobu Inoue 	p = (u_char *)(nd_rd + 1);
255682cd038dSYoshinobu Inoue 
255782cd038dSYoshinobu Inoue 	if (!router_ll6)
255882cd038dSYoshinobu Inoue 		goto nolladdropt;
255982cd038dSYoshinobu Inoue 
256082cd038dSYoshinobu Inoue 	{
256182cd038dSYoshinobu Inoue 		/* target lladdr option */
256282cd038dSYoshinobu Inoue 		int len;
256382cd038dSYoshinobu Inoue 		struct nd_opt_hdr *nd_opt;
256482cd038dSYoshinobu Inoue 		char *lladdr;
256582cd038dSYoshinobu Inoue 
25666e6b3f7cSQing Li 		ln = nd6_lookup(router_ll6, 0, ifp);
256756c423b0SKip Macy 		if (ln == NULL)
256882cd038dSYoshinobu Inoue 			goto nolladdropt;
25696e6b3f7cSQing Li 
2570686cdd19SJun-ichiro itojun Hagino 		len = sizeof(*nd_opt) + ifp->if_addrlen;
2571686cdd19SJun-ichiro itojun Hagino 		len = (len + 7) & ~7;	/* round by 8 */
2572686cdd19SJun-ichiro itojun Hagino 		/* safety check */
2573686cdd19SJun-ichiro itojun Hagino 		if (len + (p - (u_char *)ip6) > maxlen)
2574686cdd19SJun-ichiro itojun Hagino 			goto nolladdropt;
25756e6b3f7cSQing Li 
25766e6b3f7cSQing Li 		if (ln->la_flags & LLE_VALID) {
257782cd038dSYoshinobu Inoue 			nd_opt = (struct nd_opt_hdr *)p;
257882cd038dSYoshinobu Inoue 			nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
257982cd038dSYoshinobu Inoue 			nd_opt->nd_opt_len = len >> 3;
258082cd038dSYoshinobu Inoue 			lladdr = (char *)(nd_opt + 1);
25814fb3a820SAlexander V. Chernikov 			bcopy(ln->ll_addr, lladdr, ifp->if_addrlen);
2582686cdd19SJun-ichiro itojun Hagino 			p += len;
258382cd038dSYoshinobu Inoue 		}
258482cd038dSYoshinobu Inoue 	}
258556c423b0SKip Macy nolladdropt:
258656c423b0SKip Macy 	if (ln != NULL)
258756c423b0SKip Macy 		LLE_RUNLOCK(ln);
258882cd038dSYoshinobu Inoue 
258982cd038dSYoshinobu Inoue 	m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
259082cd038dSYoshinobu Inoue 
259182cd038dSYoshinobu Inoue 	/* just to be safe */
2592686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED	/*not openbsd*/
259382cd038dSYoshinobu Inoue 	if (m0->m_flags & M_DECRYPTED)
259482cd038dSYoshinobu Inoue 		goto noredhdropt;
2595686cdd19SJun-ichiro itojun Hagino #endif
2596686cdd19SJun-ichiro itojun Hagino 	if (p - (u_char *)ip6 > maxlen)
2597686cdd19SJun-ichiro itojun Hagino 		goto noredhdropt;
259882cd038dSYoshinobu Inoue 
259982cd038dSYoshinobu Inoue 	{
260082cd038dSYoshinobu Inoue 		/* redirected header option */
260182cd038dSYoshinobu Inoue 		int len;
260282cd038dSYoshinobu Inoue 		struct nd_opt_rd_hdr *nd_opt_rh;
260382cd038dSYoshinobu Inoue 
260482cd038dSYoshinobu Inoue 		/*
260582cd038dSYoshinobu Inoue 		 * compute the maximum size for icmp6 redirect header option.
260682cd038dSYoshinobu Inoue 		 * XXX room for auth header?
260782cd038dSYoshinobu Inoue 		 */
260882cd038dSYoshinobu Inoue 		len = maxlen - (p - (u_char *)ip6);
260982cd038dSYoshinobu Inoue 		len &= ~7;
261082cd038dSYoshinobu Inoue 
261182cd038dSYoshinobu Inoue 		/* This is just for simplicity. */
261282cd038dSYoshinobu Inoue 		if (m0->m_pkthdr.len != m0->m_len) {
261382cd038dSYoshinobu Inoue 			if (m0->m_next) {
261482cd038dSYoshinobu Inoue 				m_freem(m0->m_next);
261582cd038dSYoshinobu Inoue 				m0->m_next = NULL;
261682cd038dSYoshinobu Inoue 			}
261782cd038dSYoshinobu Inoue 			m0->m_pkthdr.len = m0->m_len;
261882cd038dSYoshinobu Inoue 		}
261982cd038dSYoshinobu Inoue 
262082cd038dSYoshinobu Inoue 		/*
262182cd038dSYoshinobu Inoue 		 * Redirected header option spec (RFC2461 4.6.3) talks nothing
262282cd038dSYoshinobu Inoue 		 * about padding/truncate rule for the original IP packet.
262306cd0a3fSHajimu UMEMOTO 		 * From the discussion on IPv6imp in Feb 1999,
262406cd0a3fSHajimu UMEMOTO 		 * the consensus was:
262582cd038dSYoshinobu Inoue 		 * - "attach as much as possible" is the goal
262606cd0a3fSHajimu UMEMOTO 		 * - pad if not aligned (original size can be guessed by
262706cd0a3fSHajimu UMEMOTO 		 *   original ip6 header)
262882cd038dSYoshinobu Inoue 		 * Following code adds the padding if it is simple enough,
262982cd038dSYoshinobu Inoue 		 * and truncates if not.
263082cd038dSYoshinobu Inoue 		 */
263182cd038dSYoshinobu Inoue 		if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
263206cd0a3fSHajimu UMEMOTO 			panic("assumption failed in %s:%d", __FILE__,
263306cd0a3fSHajimu UMEMOTO 			    __LINE__);
263482cd038dSYoshinobu Inoue 
263582cd038dSYoshinobu Inoue 		if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
263682cd038dSYoshinobu Inoue 			/* not enough room, truncate */
263706cd0a3fSHajimu UMEMOTO 			m0->m_pkthdr.len = m0->m_len = len -
263806cd0a3fSHajimu UMEMOTO 			    sizeof(*nd_opt_rh);
263982cd038dSYoshinobu Inoue 		} else {
264082cd038dSYoshinobu Inoue 			/* enough room, pad or truncate */
264182cd038dSYoshinobu Inoue 			size_t extra;
264282cd038dSYoshinobu Inoue 
264382cd038dSYoshinobu Inoue 			extra = m0->m_pkthdr.len % 8;
264482cd038dSYoshinobu Inoue 			if (extra) {
264582cd038dSYoshinobu Inoue 				/* pad if easy enough, truncate if not */
264682cd038dSYoshinobu Inoue 				if (8 - extra <= M_TRAILINGSPACE(m0)) {
264782cd038dSYoshinobu Inoue 					/* pad */
264882cd038dSYoshinobu Inoue 					m0->m_len += (8 - extra);
264982cd038dSYoshinobu Inoue 					m0->m_pkthdr.len += (8 - extra);
265082cd038dSYoshinobu Inoue 				} else {
265182cd038dSYoshinobu Inoue 					/* truncate */
265282cd038dSYoshinobu Inoue 					m0->m_pkthdr.len -= extra;
265382cd038dSYoshinobu Inoue 					m0->m_len -= extra;
265482cd038dSYoshinobu Inoue 				}
265582cd038dSYoshinobu Inoue 			}
265682cd038dSYoshinobu Inoue 			len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
265706cd0a3fSHajimu UMEMOTO 			m0->m_pkthdr.len = m0->m_len = len -
265806cd0a3fSHajimu UMEMOTO 			    sizeof(*nd_opt_rh);
265982cd038dSYoshinobu Inoue 		}
266082cd038dSYoshinobu Inoue 
266182cd038dSYoshinobu Inoue 		nd_opt_rh = (struct nd_opt_rd_hdr *)p;
266282cd038dSYoshinobu Inoue 		bzero(nd_opt_rh, sizeof(*nd_opt_rh));
266382cd038dSYoshinobu Inoue 		nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
266482cd038dSYoshinobu Inoue 		nd_opt_rh->nd_opt_rh_len = len >> 3;
266582cd038dSYoshinobu Inoue 		p += sizeof(*nd_opt_rh);
266682cd038dSYoshinobu Inoue 		m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
266782cd038dSYoshinobu Inoue 
266882cd038dSYoshinobu Inoue 		/* connect m0 to m */
2669db06e8a0SSUZUKI Shinsuke 		m_tag_delete_chain(m0, NULL);
2670db06e8a0SSUZUKI Shinsuke 		m0->m_flags &= ~M_PKTHDR;
267182cd038dSYoshinobu Inoue 		m->m_next = m0;
267282cd038dSYoshinobu Inoue 		m->m_pkthdr.len = m->m_len + m0->m_len;
2673db06e8a0SSUZUKI Shinsuke 		m0 = NULL;
267482cd038dSYoshinobu Inoue 	}
267582cd038dSYoshinobu Inoue noredhdropt:;
2676db06e8a0SSUZUKI Shinsuke 	if (m0) {
2677db06e8a0SSUZUKI Shinsuke 		m_freem(m0);
2678db06e8a0SSUZUKI Shinsuke 		m0 = NULL;
2679db06e8a0SSUZUKI Shinsuke 	}
268082cd038dSYoshinobu Inoue 
26819a4f9608SHajimu UMEMOTO 	/* XXX: clear embedded link IDs in the inner header */
26829a4f9608SHajimu UMEMOTO 	in6_clearscope(&sip6->ip6_src);
26839a4f9608SHajimu UMEMOTO 	in6_clearscope(&sip6->ip6_dst);
26849a4f9608SHajimu UMEMOTO 	in6_clearscope(&nd_rd->nd_rd_target);
26859a4f9608SHajimu UMEMOTO 	in6_clearscope(&nd_rd->nd_rd_dst);
268682cd038dSYoshinobu Inoue 
268782cd038dSYoshinobu Inoue 	ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
268882cd038dSYoshinobu Inoue 
268982cd038dSYoshinobu Inoue 	nd_rd->nd_rd_cksum = 0;
269006cd0a3fSHajimu UMEMOTO 	nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
269106cd0a3fSHajimu UMEMOTO 	    sizeof(*ip6), ntohs(ip6->ip6_plen));
269282cd038dSYoshinobu Inoue 
26931db8d1f8SAna Kukec         if (send_sendso_input_hook != NULL) {
26941db8d1f8SAna Kukec 		mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, sizeof(unsigned short),
26951db8d1f8SAna Kukec 			M_NOWAIT);
26961db8d1f8SAna Kukec 		if (mtag == NULL)
26971db8d1f8SAna Kukec 			goto fail;
26981db8d1f8SAna Kukec 		*(unsigned short *)(mtag + 1) = nd_rd->nd_rd_type;
26991db8d1f8SAna Kukec 		m_tag_prepend(m, mtag);
27001db8d1f8SAna Kukec 	}
27011db8d1f8SAna Kukec 
270282cd038dSYoshinobu Inoue 	/* send the packet to outside... */
27035d846453SSam Leffler 	ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
270482cd038dSYoshinobu Inoue 	if (outif) {
270582cd038dSYoshinobu Inoue 		icmp6_ifstat_inc(outif, ifs6_out_msg);
270682cd038dSYoshinobu Inoue 		icmp6_ifstat_inc(outif, ifs6_out_redirect);
270782cd038dSYoshinobu Inoue 	}
2708e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]);
270982cd038dSYoshinobu Inoue 
271082cd038dSYoshinobu Inoue 	return;
271182cd038dSYoshinobu Inoue 
271282cd038dSYoshinobu Inoue fail:
271382cd038dSYoshinobu Inoue 	if (m)
271482cd038dSYoshinobu Inoue 		m_freem(m);
271582cd038dSYoshinobu Inoue 	if (m0)
271682cd038dSYoshinobu Inoue 		m_freem(m0);
271782cd038dSYoshinobu Inoue }
271882cd038dSYoshinobu Inoue 
271982cd038dSYoshinobu Inoue /*
272082cd038dSYoshinobu Inoue  * ICMPv6 socket option processing.
272182cd038dSYoshinobu Inoue  */
272282cd038dSYoshinobu Inoue int
27231272577eSXin LI icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
272482cd038dSYoshinobu Inoue {
272582cd038dSYoshinobu Inoue 	int error = 0;
272682cd038dSYoshinobu Inoue 	int optlen;
272733841545SHajimu UMEMOTO 	struct inpcb *inp = sotoinpcb(so);
272882cd038dSYoshinobu Inoue 	int level, op, optname;
272982cd038dSYoshinobu Inoue 
273082cd038dSYoshinobu Inoue 	if (sopt) {
273182cd038dSYoshinobu Inoue 		level = sopt->sopt_level;
273282cd038dSYoshinobu Inoue 		op = sopt->sopt_dir;
273382cd038dSYoshinobu Inoue 		optname = sopt->sopt_name;
273482cd038dSYoshinobu Inoue 		optlen = sopt->sopt_valsize;
273582cd038dSYoshinobu Inoue 	} else
273682cd038dSYoshinobu Inoue 		level = op = optname = optlen = 0;
273733841545SHajimu UMEMOTO 
273882cd038dSYoshinobu Inoue 	if (level != IPPROTO_ICMPV6) {
273982cd038dSYoshinobu Inoue 		return EINVAL;
274082cd038dSYoshinobu Inoue 	}
274182cd038dSYoshinobu Inoue 
274282cd038dSYoshinobu Inoue 	switch (op) {
274382cd038dSYoshinobu Inoue 	case PRCO_SETOPT:
274482cd038dSYoshinobu Inoue 		switch (optname) {
274582cd038dSYoshinobu Inoue 		case ICMP6_FILTER:
274682cd038dSYoshinobu Inoue 		    {
2747ae89d5a3SRobert Watson 			struct icmp6_filter ic6f;
274882cd038dSYoshinobu Inoue 
2749ae89d5a3SRobert Watson 			if (optlen != sizeof(ic6f)) {
275082cd038dSYoshinobu Inoue 				error = EMSGSIZE;
275182cd038dSYoshinobu Inoue 				break;
275282cd038dSYoshinobu Inoue 			}
2753ae89d5a3SRobert Watson 			error = sooptcopyin(sopt, &ic6f, optlen, optlen);
2754ae89d5a3SRobert Watson 			if (error == 0) {
2755ae89d5a3SRobert Watson 				INP_WLOCK(inp);
2756ae89d5a3SRobert Watson 				*inp->in6p_icmp6filt = ic6f;
2757ae89d5a3SRobert Watson 				INP_WUNLOCK(inp);
2758ae89d5a3SRobert Watson 			}
275982cd038dSYoshinobu Inoue 			break;
276082cd038dSYoshinobu Inoue 		    }
276182cd038dSYoshinobu Inoue 
276282cd038dSYoshinobu Inoue 		default:
276382cd038dSYoshinobu Inoue 			error = ENOPROTOOPT;
276482cd038dSYoshinobu Inoue 			break;
276582cd038dSYoshinobu Inoue 		}
276682cd038dSYoshinobu Inoue 		break;
276782cd038dSYoshinobu Inoue 
276882cd038dSYoshinobu Inoue 	case PRCO_GETOPT:
276982cd038dSYoshinobu Inoue 		switch (optname) {
277082cd038dSYoshinobu Inoue 		case ICMP6_FILTER:
277182cd038dSYoshinobu Inoue 		    {
2772ae89d5a3SRobert Watson 			struct icmp6_filter ic6f;
2773ae89d5a3SRobert Watson 
2774ae89d5a3SRobert Watson 			INP_RLOCK(inp);
2775ae89d5a3SRobert Watson 			ic6f = *inp->in6p_icmp6filt;
2776ae89d5a3SRobert Watson 			INP_RUNLOCK(inp);
2777ae89d5a3SRobert Watson 			error = sooptcopyout(sopt, &ic6f, sizeof(ic6f));
277882cd038dSYoshinobu Inoue 			break;
277982cd038dSYoshinobu Inoue 		    }
278082cd038dSYoshinobu Inoue 
278182cd038dSYoshinobu Inoue 		default:
278282cd038dSYoshinobu Inoue 			error = ENOPROTOOPT;
278382cd038dSYoshinobu Inoue 			break;
278482cd038dSYoshinobu Inoue 		}
278582cd038dSYoshinobu Inoue 		break;
278682cd038dSYoshinobu Inoue 	}
278782cd038dSYoshinobu Inoue 
278882cd038dSYoshinobu Inoue 	return (error);
278982cd038dSYoshinobu Inoue }
279082cd038dSYoshinobu Inoue 
279182cd038dSYoshinobu Inoue /*
279282cd038dSYoshinobu Inoue  * Perform rate limit check.
279382cd038dSYoshinobu Inoue  * Returns 0 if it is okay to send the icmp6 packet.
279482cd038dSYoshinobu Inoue  * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
279582cd038dSYoshinobu Inoue  * limitation.
279682cd038dSYoshinobu Inoue  *
279782cd038dSYoshinobu Inoue  * XXX per-destination/type check necessary?
27981272577eSXin LI  *
27991272577eSXin LI  * dst - not used at this moment
28001272577eSXin LI  * type - not used at this moment
28011272577eSXin LI  * code - not used at this moment
280282cd038dSYoshinobu Inoue  */
280382cd038dSYoshinobu Inoue static int
28041272577eSXin LI icmp6_ratelimit(const struct in6_addr *dst, const int type,
28051272577eSXin LI     const int code)
280682cd038dSYoshinobu Inoue {
2807686cdd19SJun-ichiro itojun Hagino 	int ret;
280882cd038dSYoshinobu Inoue 
2809686cdd19SJun-ichiro itojun Hagino 	ret = 0;	/* okay to send */
281082cd038dSYoshinobu Inoue 
2811686cdd19SJun-ichiro itojun Hagino 	/* PPS limit */
2812603724d3SBjoern A. Zeeb 	if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count,
2813603724d3SBjoern A. Zeeb 	    V_icmp6errppslim)) {
281482cd038dSYoshinobu Inoue 		/* The packet is subject to rate limit */
2815686cdd19SJun-ichiro itojun Hagino 		ret++;
281682cd038dSYoshinobu Inoue 	}
281782cd038dSYoshinobu Inoue 
2818686cdd19SJun-ichiro itojun Hagino 	return ret;
281982cd038dSYoshinobu Inoue }
2820