xref: /freebsd/sys/netinet6/icmp6.c (revision 94e83133494420ab2aebd8bcb059d6f261f50f30)
1caf43b02SWarner Losh /*-
282cd038dSYoshinobu Inoue  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
382cd038dSYoshinobu Inoue  * All rights reserved.
482cd038dSYoshinobu Inoue  *
582cd038dSYoshinobu Inoue  * Redistribution and use in source and binary forms, with or without
682cd038dSYoshinobu Inoue  * modification, are permitted provided that the following conditions
782cd038dSYoshinobu Inoue  * are met:
882cd038dSYoshinobu Inoue  * 1. Redistributions of source code must retain the above copyright
982cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer.
1082cd038dSYoshinobu Inoue  * 2. Redistributions in binary form must reproduce the above copyright
1182cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer in the
1282cd038dSYoshinobu Inoue  *    documentation and/or other materials provided with the distribution.
1382cd038dSYoshinobu Inoue  * 3. Neither the name of the project nor the names of its contributors
1482cd038dSYoshinobu Inoue  *    may be used to endorse or promote products derived from this software
1582cd038dSYoshinobu Inoue  *    without specific prior written permission.
1682cd038dSYoshinobu Inoue  *
1782cd038dSYoshinobu Inoue  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
1882cd038dSYoshinobu Inoue  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1982cd038dSYoshinobu Inoue  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2082cd038dSYoshinobu Inoue  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
2182cd038dSYoshinobu Inoue  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2282cd038dSYoshinobu Inoue  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2382cd038dSYoshinobu Inoue  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2482cd038dSYoshinobu Inoue  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2582cd038dSYoshinobu Inoue  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2682cd038dSYoshinobu Inoue  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2782cd038dSYoshinobu Inoue  * SUCH DAMAGE.
28b48287a3SDavid E. O'Brien  *
29b48287a3SDavid E. O'Brien  *	$KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $
3082cd038dSYoshinobu Inoue  */
3182cd038dSYoshinobu Inoue 
32caf43b02SWarner Losh /*-
3382cd038dSYoshinobu Inoue  * Copyright (c) 1982, 1986, 1988, 1993
3482cd038dSYoshinobu Inoue  *	The Regents of the University of California.  All rights reserved.
3582cd038dSYoshinobu Inoue  *
3682cd038dSYoshinobu Inoue  * Redistribution and use in source and binary forms, with or without
3782cd038dSYoshinobu Inoue  * modification, are permitted provided that the following conditions
3882cd038dSYoshinobu Inoue  * are met:
3982cd038dSYoshinobu Inoue  * 1. Redistributions of source code must retain the above copyright
4082cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer.
4182cd038dSYoshinobu Inoue  * 2. Redistributions in binary form must reproduce the above copyright
4282cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer in the
4382cd038dSYoshinobu Inoue  *    documentation and/or other materials provided with the distribution.
4482cd038dSYoshinobu Inoue  * 4. Neither the name of the University nor the names of its contributors
4582cd038dSYoshinobu Inoue  *    may be used to endorse or promote products derived from this software
4682cd038dSYoshinobu Inoue  *    without specific prior written permission.
4782cd038dSYoshinobu Inoue  *
4882cd038dSYoshinobu Inoue  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
4982cd038dSYoshinobu Inoue  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
5082cd038dSYoshinobu Inoue  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
5182cd038dSYoshinobu Inoue  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
5282cd038dSYoshinobu Inoue  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
5382cd038dSYoshinobu Inoue  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
5482cd038dSYoshinobu Inoue  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
5582cd038dSYoshinobu Inoue  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
5682cd038dSYoshinobu Inoue  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
5782cd038dSYoshinobu Inoue  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
5882cd038dSYoshinobu Inoue  * SUCH DAMAGE.
5982cd038dSYoshinobu Inoue  *
6082cd038dSYoshinobu Inoue  *	@(#)ip_icmp.c	8.2 (Berkeley) 1/4/94
6182cd038dSYoshinobu Inoue  */
6282cd038dSYoshinobu Inoue 
63b48287a3SDavid E. O'Brien #include <sys/cdefs.h>
64b48287a3SDavid E. O'Brien __FBSDID("$FreeBSD$");
65b48287a3SDavid E. O'Brien 
66686cdd19SJun-ichiro itojun Hagino #include "opt_inet.h"
67686cdd19SJun-ichiro itojun Hagino #include "opt_inet6.h"
686a800098SYoshinobu Inoue #include "opt_ipsec.h"
6982cd038dSYoshinobu Inoue 
7082cd038dSYoshinobu Inoue #include <sys/param.h>
71960ed29cSSeigo Tanimura #include <sys/domain.h>
7276ca6f88SJamie Gritton #include <sys/jail.h>
73960ed29cSSeigo Tanimura #include <sys/kernel.h>
74960ed29cSSeigo Tanimura #include <sys/lock.h>
7533841545SHajimu UMEMOTO #include <sys/malloc.h>
7682cd038dSYoshinobu Inoue #include <sys/mbuf.h>
77530c0060SRobert Watson #include <sys/proc.h>
7882cd038dSYoshinobu Inoue #include <sys/protosw.h>
79960ed29cSSeigo Tanimura #include <sys/signalvar.h>
8082cd038dSYoshinobu Inoue #include <sys/socket.h>
8182cd038dSYoshinobu Inoue #include <sys/socketvar.h>
82960ed29cSSeigo Tanimura #include <sys/sx.h>
8382cd038dSYoshinobu Inoue #include <sys/syslog.h>
84960ed29cSSeigo Tanimura #include <sys/systm.h>
85960ed29cSSeigo Tanimura #include <sys/time.h>
8682cd038dSYoshinobu Inoue 
8782cd038dSYoshinobu Inoue #include <net/if.h>
8882cd038dSYoshinobu Inoue #include <net/if_dl.h>
896e6b3f7cSQing Li #include <net/if_llatbl.h>
9082cd038dSYoshinobu Inoue #include <net/if_types.h>
91960ed29cSSeigo Tanimura #include <net/route.h>
924b79449eSBjoern A. Zeeb #include <net/vnet.h>
9382cd038dSYoshinobu Inoue 
9482cd038dSYoshinobu Inoue #include <netinet/in.h>
95960ed29cSSeigo Tanimura #include <netinet/in_pcb.h>
9682cd038dSYoshinobu Inoue #include <netinet/in_var.h>
97686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h>
98686cdd19SJun-ichiro itojun Hagino #include <netinet/icmp6.h>
9997d8d152SAndre Oppermann #include <netinet/tcp_var.h>
1004b79449eSBjoern A. Zeeb 
10182cd038dSYoshinobu Inoue #include <netinet6/in6_ifattach.h>
102960ed29cSSeigo Tanimura #include <netinet6/in6_pcb.h>
10382cd038dSYoshinobu Inoue #include <netinet6/ip6protosw.h>
104960ed29cSSeigo Tanimura #include <netinet6/ip6_var.h>
105a1f7e5f8SHajimu UMEMOTO #include <netinet6/scope6_var.h>
106960ed29cSSeigo Tanimura #include <netinet6/mld6_var.h>
107960ed29cSSeigo Tanimura #include <netinet6/nd6.h>
1081db8d1f8SAna Kukec #include <netinet6/send.h>
10982cd038dSYoshinobu Inoue 
110b2630c29SGeorge V. Neville-Neil #ifdef IPSEC
111b9234fafSSam Leffler #include <netipsec/ipsec.h>
112b9234fafSSam Leffler #include <netipsec/key.h>
113b9234fafSSam Leffler #endif
114b9234fafSSam Leffler 
11582cd038dSYoshinobu Inoue extern struct domain inet6domain;
11697021c24SMarko Zec 
11782cea7e6SBjoern A. Zeeb VNET_DEFINE(struct icmp6stat, icmp6stat);
11882cea7e6SBjoern A. Zeeb 
119eddfbb76SRobert Watson VNET_DECLARE(struct inpcbinfo, ripcbinfo);
120eddfbb76SRobert Watson VNET_DECLARE(struct inpcbhead, ripcb);
121eddfbb76SRobert Watson VNET_DECLARE(int, icmp6errppslim);
1223e288e62SDimitry Andric static VNET_DEFINE(int, icmp6errpps_count) = 0;
1233e288e62SDimitry Andric static VNET_DEFINE(struct timeval, icmp6errppslim_last);
124eddfbb76SRobert Watson VNET_DECLARE(int, icmp6_nodeinfo);
12582cd038dSYoshinobu Inoue 
1261e77c105SRobert Watson #define	V_ripcbinfo			VNET(ripcbinfo)
1271e77c105SRobert Watson #define	V_ripcb				VNET(ripcb)
1281e77c105SRobert Watson #define	V_icmp6errppslim		VNET(icmp6errppslim)
1291e77c105SRobert Watson #define	V_icmp6errpps_count		VNET(icmp6errpps_count)
1301e77c105SRobert Watson #define	V_icmp6errppslim_last		VNET(icmp6errppslim_last)
13182cea7e6SBjoern A. Zeeb #define	V_icmp6_nodeinfo		VNET(icmp6_nodeinfo)
13244e33a07SMarko Zec 
1339233d8f3SDavid E. O'Brien static void icmp6_errcount(struct icmp6errstat *, int, int);
1349233d8f3SDavid E. O'Brien static int icmp6_rip6_input(struct mbuf **, int);
1359233d8f3SDavid E. O'Brien static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
13682cd038dSYoshinobu Inoue static const char *icmp6_redirect_diag __P((struct in6_addr *,
137686cdd19SJun-ichiro itojun Hagino 	struct in6_addr *, struct in6_addr *));
1389233d8f3SDavid E. O'Brien static struct mbuf *ni6_input(struct mbuf *, int);
1399233d8f3SDavid E. O'Brien static struct mbuf *ni6_nametodns(const char *, int, int);
1409233d8f3SDavid E. O'Brien static int ni6_dnsmatch(const char *, int, const char *, int);
14182cd038dSYoshinobu Inoue static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
142c66b5feaSHajimu UMEMOTO 			  struct ifnet **, struct in6_addr *));
143686cdd19SJun-ichiro itojun Hagino static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
14482cd038dSYoshinobu Inoue 				struct ifnet *, int));
1459233d8f3SDavid E. O'Brien static int icmp6_notify_error(struct mbuf **, int, int, int);
14682cd038dSYoshinobu Inoue 
147315e3e38SRobert Watson /*
148315e3e38SRobert Watson  * Kernel module interface for updating icmp6stat.  The argument is an index
149315e3e38SRobert Watson  * into icmp6stat treated as an array of u_quad_t.  While this encodes the
150315e3e38SRobert Watson  * general layout of icmp6stat into the caller, it doesn't encode its
151315e3e38SRobert Watson  * location, so that future changes to add, for example, per-CPU stats
152315e3e38SRobert Watson  * support won't cause binary compatibility problems for kernel modules.
153315e3e38SRobert Watson  */
154315e3e38SRobert Watson void
155315e3e38SRobert Watson kmod_icmp6stat_inc(int statnum)
156315e3e38SRobert Watson {
157315e3e38SRobert Watson 
158315e3e38SRobert Watson 	(*((u_quad_t *)&V_icmp6stat + statnum))++;
159315e3e38SRobert Watson }
160315e3e38SRobert Watson 
161686cdd19SJun-ichiro itojun Hagino static void
1621272577eSXin LI icmp6_errcount(struct icmp6errstat *stat, int type, int code)
163686cdd19SJun-ichiro itojun Hagino {
164686cdd19SJun-ichiro itojun Hagino 	switch (type) {
165686cdd19SJun-ichiro itojun Hagino 	case ICMP6_DST_UNREACH:
166686cdd19SJun-ichiro itojun Hagino 		switch (code) {
167686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_NOROUTE:
168686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_dst_unreach_noroute++;
169686cdd19SJun-ichiro itojun Hagino 			return;
170686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_ADMIN:
171686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_dst_unreach_admin++;
172686cdd19SJun-ichiro itojun Hagino 			return;
173686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_BEYONDSCOPE:
174686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_dst_unreach_beyondscope++;
175686cdd19SJun-ichiro itojun Hagino 			return;
176686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_ADDR:
177686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_dst_unreach_addr++;
178686cdd19SJun-ichiro itojun Hagino 			return;
179686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_NOPORT:
180686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_dst_unreach_noport++;
181686cdd19SJun-ichiro itojun Hagino 			return;
182686cdd19SJun-ichiro itojun Hagino 		}
183686cdd19SJun-ichiro itojun Hagino 		break;
184686cdd19SJun-ichiro itojun Hagino 	case ICMP6_PACKET_TOO_BIG:
185686cdd19SJun-ichiro itojun Hagino 		stat->icp6errs_packet_too_big++;
186686cdd19SJun-ichiro itojun Hagino 		return;
187686cdd19SJun-ichiro itojun Hagino 	case ICMP6_TIME_EXCEEDED:
188686cdd19SJun-ichiro itojun Hagino 		switch (code) {
189686cdd19SJun-ichiro itojun Hagino 		case ICMP6_TIME_EXCEED_TRANSIT:
190686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_time_exceed_transit++;
191686cdd19SJun-ichiro itojun Hagino 			return;
192686cdd19SJun-ichiro itojun Hagino 		case ICMP6_TIME_EXCEED_REASSEMBLY:
193686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_time_exceed_reassembly++;
194686cdd19SJun-ichiro itojun Hagino 			return;
195686cdd19SJun-ichiro itojun Hagino 		}
196686cdd19SJun-ichiro itojun Hagino 		break;
197686cdd19SJun-ichiro itojun Hagino 	case ICMP6_PARAM_PROB:
198686cdd19SJun-ichiro itojun Hagino 		switch (code) {
199686cdd19SJun-ichiro itojun Hagino 		case ICMP6_PARAMPROB_HEADER:
200686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_paramprob_header++;
201686cdd19SJun-ichiro itojun Hagino 			return;
202686cdd19SJun-ichiro itojun Hagino 		case ICMP6_PARAMPROB_NEXTHEADER:
203686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_paramprob_nextheader++;
204686cdd19SJun-ichiro itojun Hagino 			return;
205686cdd19SJun-ichiro itojun Hagino 		case ICMP6_PARAMPROB_OPTION:
206686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_paramprob_option++;
207686cdd19SJun-ichiro itojun Hagino 			return;
208686cdd19SJun-ichiro itojun Hagino 		}
209686cdd19SJun-ichiro itojun Hagino 		break;
210686cdd19SJun-ichiro itojun Hagino 	case ND_REDIRECT:
211686cdd19SJun-ichiro itojun Hagino 		stat->icp6errs_redirect++;
212686cdd19SJun-ichiro itojun Hagino 		return;
213686cdd19SJun-ichiro itojun Hagino 	}
214686cdd19SJun-ichiro itojun Hagino 	stat->icp6errs_unknown++;
215686cdd19SJun-ichiro itojun Hagino }
216686cdd19SJun-ichiro itojun Hagino 
21782cd038dSYoshinobu Inoue /*
218a1f7e5f8SHajimu UMEMOTO  * A wrapper function for icmp6_error() necessary when the erroneous packet
219a1f7e5f8SHajimu UMEMOTO  * may not contain enough scope zone information.
220a1f7e5f8SHajimu UMEMOTO  */
221a1f7e5f8SHajimu UMEMOTO void
2221272577eSXin LI icmp6_error2(struct mbuf *m, int type, int code, int param,
2231272577eSXin LI     struct ifnet *ifp)
224a1f7e5f8SHajimu UMEMOTO {
225a1f7e5f8SHajimu UMEMOTO 	struct ip6_hdr *ip6;
226a1f7e5f8SHajimu UMEMOTO 
227a1f7e5f8SHajimu UMEMOTO 	if (ifp == NULL)
228a1f7e5f8SHajimu UMEMOTO 		return;
229a1f7e5f8SHajimu UMEMOTO 
230a1f7e5f8SHajimu UMEMOTO #ifndef PULLDOWN_TEST
231a1f7e5f8SHajimu UMEMOTO 	IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
232a1f7e5f8SHajimu UMEMOTO #else
233a1f7e5f8SHajimu UMEMOTO 	if (m->m_len < sizeof(struct ip6_hdr)) {
234a1f7e5f8SHajimu UMEMOTO 		m = m_pullup(m, sizeof(struct ip6_hdr));
235a1f7e5f8SHajimu UMEMOTO 		if (m == NULL)
236a1f7e5f8SHajimu UMEMOTO 			return;
237a1f7e5f8SHajimu UMEMOTO 	}
238a1f7e5f8SHajimu UMEMOTO #endif
239a1f7e5f8SHajimu UMEMOTO 
240a1f7e5f8SHajimu UMEMOTO 	ip6 = mtod(m, struct ip6_hdr *);
241a1f7e5f8SHajimu UMEMOTO 
242a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
243a1f7e5f8SHajimu UMEMOTO 		return;
244a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
245a1f7e5f8SHajimu UMEMOTO 		return;
246a1f7e5f8SHajimu UMEMOTO 
247a1f7e5f8SHajimu UMEMOTO 	icmp6_error(m, type, code, param);
248a1f7e5f8SHajimu UMEMOTO }
249a1f7e5f8SHajimu UMEMOTO 
250a1f7e5f8SHajimu UMEMOTO /*
25182cd038dSYoshinobu Inoue  * Generate an error packet of type error in response to bad IP6 packet.
25282cd038dSYoshinobu Inoue  */
25382cd038dSYoshinobu Inoue void
2541272577eSXin LI icmp6_error(struct mbuf *m, int type, int code, int param)
25582cd038dSYoshinobu Inoue {
25682cd038dSYoshinobu Inoue 	struct ip6_hdr *oip6, *nip6;
25782cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6;
258686cdd19SJun-ichiro itojun Hagino 	u_int preplen;
25982cd038dSYoshinobu Inoue 	int off;
260686cdd19SJun-ichiro itojun Hagino 	int nxt;
26182cd038dSYoshinobu Inoue 
262e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_error);
26382cd038dSYoshinobu Inoue 
264686cdd19SJun-ichiro itojun Hagino 	/* count per-type-code statistics */
265603724d3SBjoern A. Zeeb 	icmp6_errcount(&V_icmp6stat.icp6s_outerrhist, type, code);
26682cd038dSYoshinobu Inoue 
267686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED	/*not openbsd*/
268686cdd19SJun-ichiro itojun Hagino 	if (m->m_flags & M_DECRYPTED) {
269e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_canterror);
270686cdd19SJun-ichiro itojun Hagino 		goto freeit;
271686cdd19SJun-ichiro itojun Hagino 	}
272686cdd19SJun-ichiro itojun Hagino #endif
273686cdd19SJun-ichiro itojun Hagino 
274686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
275686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
276686cdd19SJun-ichiro itojun Hagino #else
277686cdd19SJun-ichiro itojun Hagino 	if (m->m_len < sizeof(struct ip6_hdr)) {
278686cdd19SJun-ichiro itojun Hagino 		m = m_pullup(m, sizeof(struct ip6_hdr));
279686cdd19SJun-ichiro itojun Hagino 		if (m == NULL)
280686cdd19SJun-ichiro itojun Hagino 			return;
281686cdd19SJun-ichiro itojun Hagino 	}
282686cdd19SJun-ichiro itojun Hagino #endif
28382cd038dSYoshinobu Inoue 	oip6 = mtod(m, struct ip6_hdr *);
28482cd038dSYoshinobu Inoue 
28582cd038dSYoshinobu Inoue 	/*
286f95d4633SHajimu UMEMOTO 	 * If the destination address of the erroneous packet is a multicast
287f95d4633SHajimu UMEMOTO 	 * address, or the packet was sent using link-layer multicast,
288f95d4633SHajimu UMEMOTO 	 * we should basically suppress sending an error (RFC 2463, Section
289f95d4633SHajimu UMEMOTO 	 * 2.4).
290f95d4633SHajimu UMEMOTO 	 * We have two exceptions (the item e.2 in that section):
2911767c520SBjoern A. Zeeb 	 * - the Packet Too Big message can be sent for path MTU discovery.
292f95d4633SHajimu UMEMOTO 	 * - the Parameter Problem Message that can be allowed an icmp6 error
293f95d4633SHajimu UMEMOTO 	 *   in the option type field.  This check has been done in
294f95d4633SHajimu UMEMOTO 	 *   ip6_unknown_opt(), so we can just check the type and code.
29582cd038dSYoshinobu Inoue 	 */
29682cd038dSYoshinobu Inoue 	if ((m->m_flags & (M_BCAST|M_MCAST) ||
29782cd038dSYoshinobu Inoue 	     IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
29882cd038dSYoshinobu Inoue 	    (type != ICMP6_PACKET_TOO_BIG &&
29982cd038dSYoshinobu Inoue 	     (type != ICMP6_PARAM_PROB ||
30082cd038dSYoshinobu Inoue 	      code != ICMP6_PARAMPROB_OPTION)))
30182cd038dSYoshinobu Inoue 		goto freeit;
30282cd038dSYoshinobu Inoue 
303f95d4633SHajimu UMEMOTO 	/*
304f95d4633SHajimu UMEMOTO 	 * RFC 2463, 2.4 (e.5): source address check.
305f95d4633SHajimu UMEMOTO 	 * XXX: the case of anycast source?
306f95d4633SHajimu UMEMOTO 	 */
30782cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
30882cd038dSYoshinobu Inoue 	    IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
30982cd038dSYoshinobu Inoue 		goto freeit;
31082cd038dSYoshinobu Inoue 
31182cd038dSYoshinobu Inoue 	/*
312686cdd19SJun-ichiro itojun Hagino 	 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
313686cdd19SJun-ichiro itojun Hagino 	 * don't do it.
31482cd038dSYoshinobu Inoue 	 */
315686cdd19SJun-ichiro itojun Hagino 	nxt = -1;
316686cdd19SJun-ichiro itojun Hagino 	off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
317686cdd19SJun-ichiro itojun Hagino 	if (off >= 0 && nxt == IPPROTO_ICMPV6) {
31882cd038dSYoshinobu Inoue 		struct icmp6_hdr *icp;
31982cd038dSYoshinobu Inoue 
320686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
32182cd038dSYoshinobu Inoue 		IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
32282cd038dSYoshinobu Inoue 		icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
323686cdd19SJun-ichiro itojun Hagino #else
324686cdd19SJun-ichiro itojun Hagino 		IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
325686cdd19SJun-ichiro itojun Hagino 			sizeof(*icp));
326686cdd19SJun-ichiro itojun Hagino 		if (icp == NULL) {
327e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_tooshort);
328686cdd19SJun-ichiro itojun Hagino 			return;
329686cdd19SJun-ichiro itojun Hagino 		}
330686cdd19SJun-ichiro itojun Hagino #endif
331686cdd19SJun-ichiro itojun Hagino 		if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
332686cdd19SJun-ichiro itojun Hagino 		    icp->icmp6_type == ND_REDIRECT) {
33382cd038dSYoshinobu Inoue 			/*
33482cd038dSYoshinobu Inoue 			 * ICMPv6 error
33582cd038dSYoshinobu Inoue 			 * Special case: for redirect (which is
33682cd038dSYoshinobu Inoue 			 * informational) we must not send icmp6 error.
33782cd038dSYoshinobu Inoue 			 */
338e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_canterror);
33982cd038dSYoshinobu Inoue 			goto freeit;
34082cd038dSYoshinobu Inoue 		} else {
341686cdd19SJun-ichiro itojun Hagino 			/* ICMPv6 informational - send the error */
34282cd038dSYoshinobu Inoue 		}
343686cdd19SJun-ichiro itojun Hagino 	} else {
344686cdd19SJun-ichiro itojun Hagino 		/* non-ICMPv6 - send the error */
34582cd038dSYoshinobu Inoue 	}
34682cd038dSYoshinobu Inoue 
34782cd038dSYoshinobu Inoue 	oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
34882cd038dSYoshinobu Inoue 
34982cd038dSYoshinobu Inoue 	/* Finally, do rate limitation check. */
35082cd038dSYoshinobu Inoue 	if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
351e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_toofreq);
35282cd038dSYoshinobu Inoue 		goto freeit;
35382cd038dSYoshinobu Inoue 	}
35482cd038dSYoshinobu Inoue 
35582cd038dSYoshinobu Inoue 	/*
35682cd038dSYoshinobu Inoue 	 * OK, ICMP6 can be generated.
35782cd038dSYoshinobu Inoue 	 */
35882cd038dSYoshinobu Inoue 
35982cd038dSYoshinobu Inoue 	if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
36082cd038dSYoshinobu Inoue 		m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
36182cd038dSYoshinobu Inoue 
362686cdd19SJun-ichiro itojun Hagino 	preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
363a163d034SWarner Losh 	M_PREPEND(m, preplen, M_DONTWAIT);
364686cdd19SJun-ichiro itojun Hagino 	if (m && m->m_len < preplen)
365686cdd19SJun-ichiro itojun Hagino 		m = m_pullup(m, preplen);
36682cd038dSYoshinobu Inoue 	if (m == NULL) {
36733841545SHajimu UMEMOTO 		nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
36882cd038dSYoshinobu Inoue 		return;
36982cd038dSYoshinobu Inoue 	}
37082cd038dSYoshinobu Inoue 
37182cd038dSYoshinobu Inoue 	nip6 = mtod(m, struct ip6_hdr *);
37282cd038dSYoshinobu Inoue 	nip6->ip6_src  = oip6->ip6_src;
37382cd038dSYoshinobu Inoue 	nip6->ip6_dst  = oip6->ip6_dst;
37482cd038dSYoshinobu Inoue 
3759a4f9608SHajimu UMEMOTO 	in6_clearscope(&oip6->ip6_src);
3769a4f9608SHajimu UMEMOTO 	in6_clearscope(&oip6->ip6_dst);
37782cd038dSYoshinobu Inoue 
37882cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)(nip6 + 1);
37982cd038dSYoshinobu Inoue 	icmp6->icmp6_type = type;
38082cd038dSYoshinobu Inoue 	icmp6->icmp6_code = code;
38182cd038dSYoshinobu Inoue 	icmp6->icmp6_pptr = htonl((u_int32_t)param);
38282cd038dSYoshinobu Inoue 
38333841545SHajimu UMEMOTO 	/*
38433841545SHajimu UMEMOTO 	 * icmp6_reflect() is designed to be in the input path.
385cd0fdcf7SHajimu UMEMOTO 	 * icmp6_error() can be called from both input and output path,
38633841545SHajimu UMEMOTO 	 * and if we are in output path rcvif could contain bogus value.
38733841545SHajimu UMEMOTO 	 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
38833841545SHajimu UMEMOTO 	 * information in ip header (nip6).
38933841545SHajimu UMEMOTO 	 */
39033841545SHajimu UMEMOTO 	m->m_pkthdr.rcvif = NULL;
39133841545SHajimu UMEMOTO 
392e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_outhist[type]);
39382cd038dSYoshinobu Inoue 	icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
394686cdd19SJun-ichiro itojun Hagino 
395686cdd19SJun-ichiro itojun Hagino 	return;
396686cdd19SJun-ichiro itojun Hagino 
397686cdd19SJun-ichiro itojun Hagino   freeit:
398686cdd19SJun-ichiro itojun Hagino 	/*
399cd0fdcf7SHajimu UMEMOTO 	 * If we can't tell whether or not we can generate ICMP6, free it.
400686cdd19SJun-ichiro itojun Hagino 	 */
401686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
40282cd038dSYoshinobu Inoue }
40382cd038dSYoshinobu Inoue 
40482cd038dSYoshinobu Inoue /*
40582cd038dSYoshinobu Inoue  * Process a received ICMP6 message.
40682cd038dSYoshinobu Inoue  */
40782cd038dSYoshinobu Inoue int
4081272577eSXin LI icmp6_input(struct mbuf **mp, int *offp, int proto)
40982cd038dSYoshinobu Inoue {
41082cd038dSYoshinobu Inoue 	struct mbuf *m = *mp, *n;
41129dc7bc6SBruce M Simpson 	struct ifnet *ifp;
41282cd038dSYoshinobu Inoue 	struct ip6_hdr *ip6, *nip6;
41382cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6, *nicmp6;
41482cd038dSYoshinobu Inoue 	int off = *offp;
41582cd038dSYoshinobu Inoue 	int icmp6len = m->m_pkthdr.len - *offp;
41682cd038dSYoshinobu Inoue 	int code, sum, noff;
4171d54aa3bSBjoern A. Zeeb 	char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
4181db8d1f8SAna Kukec 	int ip6len, error;
41982cd038dSYoshinobu Inoue 
42029dc7bc6SBruce M Simpson 	ifp = m->m_pkthdr.rcvif;
42129dc7bc6SBruce M Simpson 
422686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
42382cd038dSYoshinobu Inoue 	IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
42482cd038dSYoshinobu Inoue 	/* m might change if M_LOOP.  So, call mtod after this */
425686cdd19SJun-ichiro itojun Hagino #endif
42682cd038dSYoshinobu Inoue 
42782cd038dSYoshinobu Inoue 	/*
42882cd038dSYoshinobu Inoue 	 * Locate icmp6 structure in mbuf, and check
42982cd038dSYoshinobu Inoue 	 * that not corrupted and of at least minimum length
43082cd038dSYoshinobu Inoue 	 */
43182cd038dSYoshinobu Inoue 
43282cd038dSYoshinobu Inoue 	ip6 = mtod(m, struct ip6_hdr *);
4331db8d1f8SAna Kukec 	ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
43482cd038dSYoshinobu Inoue 	if (icmp6len < sizeof(struct icmp6_hdr)) {
435e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
43682cd038dSYoshinobu Inoue 		goto freeit;
43782cd038dSYoshinobu Inoue 	}
43882cd038dSYoshinobu Inoue 
43982cd038dSYoshinobu Inoue 	/*
44033cde130SBruce M Simpson 	 * Check multicast group membership.
44133cde130SBruce M Simpson 	 * Note: SSM filters are not applied for ICMPv6 traffic.
44233cde130SBruce M Simpson 	 */
44333cde130SBruce M Simpson 	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
44433cde130SBruce M Simpson 		struct in6_multi	*inm;
44533cde130SBruce M Simpson 
44633cde130SBruce M Simpson 		inm = in6m_lookup(ifp, &ip6->ip6_dst);
44733cde130SBruce M Simpson 		if (inm == NULL) {
44833cde130SBruce M Simpson 			IP6STAT_INC(ip6s_notmember);
44933cde130SBruce M Simpson 			in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
45033cde130SBruce M Simpson 			goto freeit;
45133cde130SBruce M Simpson 		}
45233cde130SBruce M Simpson 	}
45333cde130SBruce M Simpson 
45433cde130SBruce M Simpson 	/*
45582cd038dSYoshinobu Inoue 	 * calculate the checksum
45682cd038dSYoshinobu Inoue 	 */
457686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
45882cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
459686cdd19SJun-ichiro itojun Hagino #else
460686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
461686cdd19SJun-ichiro itojun Hagino 	if (icmp6 == NULL) {
462e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
463686cdd19SJun-ichiro itojun Hagino 		return IPPROTO_DONE;
464686cdd19SJun-ichiro itojun Hagino 	}
465686cdd19SJun-ichiro itojun Hagino #endif
46682cd038dSYoshinobu Inoue 	code = icmp6->icmp6_code;
46782cd038dSYoshinobu Inoue 
46882cd038dSYoshinobu Inoue 	if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
46933841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
47082cd038dSYoshinobu Inoue 		    "ICMP6 checksum error(%d|%x) %s\n",
4711d54aa3bSBjoern A. Zeeb 		    icmp6->icmp6_type, sum,
4721d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6bufs, &ip6->ip6_src)));
473e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_checksum);
47482cd038dSYoshinobu Inoue 		goto freeit;
47582cd038dSYoshinobu Inoue 	}
47682cd038dSYoshinobu Inoue 
4779494d596SBrooks Davis 	if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
47882cd038dSYoshinobu Inoue 		/*
47982cd038dSYoshinobu Inoue 		 * Deliver very specific ICMP6 type only.
480cd0fdcf7SHajimu UMEMOTO 		 * This is important to deliver TOOBIG.  Otherwise PMTUD
48182cd038dSYoshinobu Inoue 		 * will not work.
48282cd038dSYoshinobu Inoue 		 */
48382cd038dSYoshinobu Inoue 		switch (icmp6->icmp6_type) {
48482cd038dSYoshinobu Inoue 		case ICMP6_DST_UNREACH:
48582cd038dSYoshinobu Inoue 		case ICMP6_PACKET_TOO_BIG:
48682cd038dSYoshinobu Inoue 		case ICMP6_TIME_EXCEEDED:
48782cd038dSYoshinobu Inoue 			break;
48882cd038dSYoshinobu Inoue 		default:
48982cd038dSYoshinobu Inoue 			goto freeit;
49082cd038dSYoshinobu Inoue 		}
49182cd038dSYoshinobu Inoue 	}
49282cd038dSYoshinobu Inoue 
493e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]);
49429dc7bc6SBruce M Simpson 	icmp6_ifstat_inc(ifp, ifs6_in_msg);
49582cd038dSYoshinobu Inoue 	if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
49629dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_error);
49782cd038dSYoshinobu Inoue 
49882cd038dSYoshinobu Inoue 	switch (icmp6->icmp6_type) {
49982cd038dSYoshinobu Inoue 	case ICMP6_DST_UNREACH:
50029dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_dstunreach);
50182cd038dSYoshinobu Inoue 		switch (code) {
50282cd038dSYoshinobu Inoue 		case ICMP6_DST_UNREACH_NOROUTE:
50382cd038dSYoshinobu Inoue 			code = PRC_UNREACH_NET;
50482cd038dSYoshinobu Inoue 			break;
50582cd038dSYoshinobu Inoue 		case ICMP6_DST_UNREACH_ADMIN:
50629dc7bc6SBruce M Simpson 			icmp6_ifstat_inc(ifp, ifs6_in_adminprohib);
507686cdd19SJun-ichiro itojun Hagino 			code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
50882cd038dSYoshinobu Inoue 			break;
509686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_ADDR:
510686cdd19SJun-ichiro itojun Hagino 			code = PRC_HOSTDEAD;
511686cdd19SJun-ichiro itojun Hagino 			break;
512686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_BEYONDSCOPE:
513686cdd19SJun-ichiro itojun Hagino 			/* I mean "source address was incorrect." */
514686cdd19SJun-ichiro itojun Hagino 			code = PRC_PARAMPROB;
515686cdd19SJun-ichiro itojun Hagino 			break;
51682cd038dSYoshinobu Inoue 		case ICMP6_DST_UNREACH_NOPORT:
51782cd038dSYoshinobu Inoue 			code = PRC_UNREACH_PORT;
51882cd038dSYoshinobu Inoue 			break;
51982cd038dSYoshinobu Inoue 		default:
52082cd038dSYoshinobu Inoue 			goto badcode;
52182cd038dSYoshinobu Inoue 		}
52282cd038dSYoshinobu Inoue 		goto deliver;
52382cd038dSYoshinobu Inoue 		break;
52482cd038dSYoshinobu Inoue 
52582cd038dSYoshinobu Inoue 	case ICMP6_PACKET_TOO_BIG:
52629dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig);
52782cd038dSYoshinobu Inoue 
528aaff9927SHajimu UMEMOTO 		/* validation is made in icmp6_mtudisc_update */
529aaff9927SHajimu UMEMOTO 
53082cd038dSYoshinobu Inoue 		code = PRC_MSGSIZE;
53182cd038dSYoshinobu Inoue 
532686cdd19SJun-ichiro itojun Hagino 		/*
533686cdd19SJun-ichiro itojun Hagino 		 * Updating the path MTU will be done after examining
534686cdd19SJun-ichiro itojun Hagino 		 * intermediate extension headers.
535686cdd19SJun-ichiro itojun Hagino 		 */
53682cd038dSYoshinobu Inoue 		goto deliver;
53782cd038dSYoshinobu Inoue 		break;
53882cd038dSYoshinobu Inoue 
53982cd038dSYoshinobu Inoue 	case ICMP6_TIME_EXCEEDED:
54029dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_timeexceed);
54182cd038dSYoshinobu Inoue 		switch (code) {
54282cd038dSYoshinobu Inoue 		case ICMP6_TIME_EXCEED_TRANSIT:
5432ce62dceSSUZUKI Shinsuke 			code = PRC_TIMXCEED_INTRANS;
5442ce62dceSSUZUKI Shinsuke 			break;
54582cd038dSYoshinobu Inoue 		case ICMP6_TIME_EXCEED_REASSEMBLY:
5462ce62dceSSUZUKI Shinsuke 			code = PRC_TIMXCEED_REASS;
54782cd038dSYoshinobu Inoue 			break;
54882cd038dSYoshinobu Inoue 		default:
54982cd038dSYoshinobu Inoue 			goto badcode;
55082cd038dSYoshinobu Inoue 		}
55182cd038dSYoshinobu Inoue 		goto deliver;
55282cd038dSYoshinobu Inoue 		break;
55382cd038dSYoshinobu Inoue 
55482cd038dSYoshinobu Inoue 	case ICMP6_PARAM_PROB:
55529dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_paramprob);
55682cd038dSYoshinobu Inoue 		switch (code) {
55782cd038dSYoshinobu Inoue 		case ICMP6_PARAMPROB_NEXTHEADER:
55882cd038dSYoshinobu Inoue 			code = PRC_UNREACH_PROTOCOL;
55982cd038dSYoshinobu Inoue 			break;
56082cd038dSYoshinobu Inoue 		case ICMP6_PARAMPROB_HEADER:
56182cd038dSYoshinobu Inoue 		case ICMP6_PARAMPROB_OPTION:
56282cd038dSYoshinobu Inoue 			code = PRC_PARAMPROB;
56382cd038dSYoshinobu Inoue 			break;
56482cd038dSYoshinobu Inoue 		default:
56582cd038dSYoshinobu Inoue 			goto badcode;
56682cd038dSYoshinobu Inoue 		}
56782cd038dSYoshinobu Inoue 		goto deliver;
56882cd038dSYoshinobu Inoue 		break;
56982cd038dSYoshinobu Inoue 
57082cd038dSYoshinobu Inoue 	case ICMP6_ECHO_REQUEST:
57129dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_echo);
57282cd038dSYoshinobu Inoue 		if (code != 0)
57382cd038dSYoshinobu Inoue 			goto badcode;
57482cd038dSYoshinobu Inoue 		if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
57582cd038dSYoshinobu Inoue 			/* Give up remote */
57682cd038dSYoshinobu Inoue 			break;
57782cd038dSYoshinobu Inoue 		}
578686cdd19SJun-ichiro itojun Hagino 		if ((n->m_flags & M_EXT) != 0
579686cdd19SJun-ichiro itojun Hagino 		 || n->m_len < off + sizeof(struct icmp6_hdr)) {
58082cd038dSYoshinobu Inoue 			struct mbuf *n0 = n;
581686cdd19SJun-ichiro itojun Hagino 			const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
5822268ca47SSam Leffler 			int n0len;
58382cd038dSYoshinobu Inoue 
584a163d034SWarner Losh 			MGETHDR(n, M_DONTWAIT, n0->m_type);
5855c47350dSSam Leffler 			n0len = n0->m_pkthdr.len;	/* save for use below */
5865c47350dSSam Leffler 			if (n)
5875c47350dSSam Leffler 				M_MOVE_PKTHDR(n, n0);
588686cdd19SJun-ichiro itojun Hagino 			if (n && maxlen >= MHLEN) {
589a163d034SWarner Losh 				MCLGET(n, M_DONTWAIT);
590686cdd19SJun-ichiro itojun Hagino 				if ((n->m_flags & M_EXT) == 0) {
591686cdd19SJun-ichiro itojun Hagino 					m_free(n);
592686cdd19SJun-ichiro itojun Hagino 					n = NULL;
593686cdd19SJun-ichiro itojun Hagino 				}
594686cdd19SJun-ichiro itojun Hagino 			}
59582cd038dSYoshinobu Inoue 			if (n == NULL) {
59682cd038dSYoshinobu Inoue 				/* Give up remote */
59782cd038dSYoshinobu Inoue 				m_freem(n0);
59882cd038dSYoshinobu Inoue 				break;
59982cd038dSYoshinobu Inoue 			}
60082cd038dSYoshinobu Inoue 			/*
60182cd038dSYoshinobu Inoue 			 * Copy IPv6 and ICMPv6 only.
60282cd038dSYoshinobu Inoue 			 */
60382cd038dSYoshinobu Inoue 			nip6 = mtod(n, struct ip6_hdr *);
60482cd038dSYoshinobu Inoue 			bcopy(ip6, nip6, sizeof(struct ip6_hdr));
60582cd038dSYoshinobu Inoue 			nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
60682cd038dSYoshinobu Inoue 			bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
60782cd038dSYoshinobu Inoue 			noff = sizeof(struct ip6_hdr);
6082268ca47SSam Leffler 			/* new mbuf contains only ipv6+icmpv6 headers */
6092268ca47SSam Leffler 			n->m_len = noff + sizeof(struct icmp6_hdr);
610686cdd19SJun-ichiro itojun Hagino 			/*
611686cdd19SJun-ichiro itojun Hagino 			 * Adjust mbuf.  ip6_plen will be adjusted in
612686cdd19SJun-ichiro itojun Hagino 			 * ip6_output().
613686cdd19SJun-ichiro itojun Hagino 			 */
614686cdd19SJun-ichiro itojun Hagino 			m_adj(n0, off + sizeof(struct icmp6_hdr));
6152268ca47SSam Leffler 			/* recalculate complete packet size */
6162268ca47SSam Leffler 			n->m_pkthdr.len = n0len + (noff - off);
617686cdd19SJun-ichiro itojun Hagino 			n->m_next = n0;
61882cd038dSYoshinobu Inoue 		} else {
61982cd038dSYoshinobu Inoue 			nip6 = mtod(n, struct ip6_hdr *);
6206a550ab3SHajimu UMEMOTO 			IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
6216a550ab3SHajimu UMEMOTO 			    sizeof(*nicmp6));
62282cd038dSYoshinobu Inoue 			noff = off;
62382cd038dSYoshinobu Inoue 		}
62482cd038dSYoshinobu Inoue 		nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
62582cd038dSYoshinobu Inoue 		nicmp6->icmp6_code = 0;
62682cd038dSYoshinobu Inoue 		if (n) {
627e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_reflect);
628e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]);
62982cd038dSYoshinobu Inoue 			icmp6_reflect(n, noff);
63082cd038dSYoshinobu Inoue 		}
63182cd038dSYoshinobu Inoue 		break;
63282cd038dSYoshinobu Inoue 
63382cd038dSYoshinobu Inoue 	case ICMP6_ECHO_REPLY:
63429dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_echoreply);
63582cd038dSYoshinobu Inoue 		if (code != 0)
63682cd038dSYoshinobu Inoue 			goto badcode;
63782cd038dSYoshinobu Inoue 		break;
63882cd038dSYoshinobu Inoue 
63981170631SHajimu UMEMOTO 	case MLD_LISTENER_QUERY:
64081170631SHajimu UMEMOTO 	case MLD_LISTENER_REPORT:
64133cde130SBruce M Simpson 	case MLD_LISTENER_DONE:
64233cde130SBruce M Simpson 	case MLDV2_LISTENER_REPORT:
64333cde130SBruce M Simpson 		/*
64429dc7bc6SBruce M Simpson 		 * Drop MLD traffic which is not link-local, has a hop limit
64529dc7bc6SBruce M Simpson 		 * of greater than 1 hop, or which does not have the
64629dc7bc6SBruce M Simpson 		 * IPv6 HBH Router Alert option.
64729dc7bc6SBruce M Simpson 		 * As IPv6 HBH options are stripped in ip6_input() we must
64829dc7bc6SBruce M Simpson 		 * check an mbuf header flag.
64933cde130SBruce M Simpson 		 * XXX Should we also sanity check that these messages
65033cde130SBruce M Simpson 		 * were directed to a link-local multicast prefix?
65133cde130SBruce M Simpson 		 */
65229dc7bc6SBruce M Simpson 		if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0)
653686cdd19SJun-ichiro itojun Hagino 			goto freeit;
65433cde130SBruce M Simpson 		if (mld_input(m, off, icmp6len) != 0)
65533cde130SBruce M Simpson 			return (IPPROTO_DONE);
65682cd038dSYoshinobu Inoue 		/* m stays. */
65782cd038dSYoshinobu Inoue 		break;
65882cd038dSYoshinobu Inoue 
65982cd038dSYoshinobu Inoue 	case ICMP6_WRUREQUEST:	/* ICMP6_FQDN_QUERY */
66082cd038dSYoshinobu Inoue 	    {
66182cd038dSYoshinobu Inoue 		enum { WRU, FQDN } mode;
66282cd038dSYoshinobu Inoue 
663603724d3SBjoern A. Zeeb 		if (!V_icmp6_nodeinfo)
664686cdd19SJun-ichiro itojun Hagino 			break;
665686cdd19SJun-ichiro itojun Hagino 
66682cd038dSYoshinobu Inoue 		if (icmp6len == sizeof(struct icmp6_hdr) + 4)
66782cd038dSYoshinobu Inoue 			mode = WRU;
668686cdd19SJun-ichiro itojun Hagino 		else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
66982cd038dSYoshinobu Inoue 			mode = FQDN;
67082cd038dSYoshinobu Inoue 		else
67182cd038dSYoshinobu Inoue 			goto badlen;
67282cd038dSYoshinobu Inoue 
67382cd038dSYoshinobu Inoue 		if (mode == FQDN) {
674686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
67582cd038dSYoshinobu Inoue 			IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
67682cd038dSYoshinobu Inoue 			    IPPROTO_DONE);
677686cdd19SJun-ichiro itojun Hagino #endif
678686cdd19SJun-ichiro itojun Hagino 			n = m_copy(m, 0, M_COPYALL);
679686cdd19SJun-ichiro itojun Hagino 			if (n)
680686cdd19SJun-ichiro itojun Hagino 				n = ni6_input(n, off);
681686cdd19SJun-ichiro itojun Hagino 			/* XXX meaningless if n == NULL */
68282cd038dSYoshinobu Inoue 			noff = sizeof(struct ip6_hdr);
68382cd038dSYoshinobu Inoue 		} else {
68476ca6f88SJamie Gritton 			struct prison *pr;
68582cd038dSYoshinobu Inoue 			u_char *p;
68676ca6f88SJamie Gritton 			int maxlen, maxhlen, hlen;
68782cd038dSYoshinobu Inoue 
68818706985SJINMEI Tatuya 			/*
68918706985SJINMEI Tatuya 			 * XXX: this combination of flags is pointless,
69018706985SJINMEI Tatuya 			 * but should we keep this for compatibility?
69118706985SJINMEI Tatuya 			 */
692603724d3SBjoern A. Zeeb 			if ((V_icmp6_nodeinfo & 5) != 5)
69333841545SHajimu UMEMOTO 				break;
69433841545SHajimu UMEMOTO 
695686cdd19SJun-ichiro itojun Hagino 			if (code != 0)
696686cdd19SJun-ichiro itojun Hagino 				goto badcode;
697686cdd19SJun-ichiro itojun Hagino 			maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
698686cdd19SJun-ichiro itojun Hagino 			if (maxlen >= MCLBYTES) {
699686cdd19SJun-ichiro itojun Hagino 				/* Give up remote */
700686cdd19SJun-ichiro itojun Hagino 				break;
701686cdd19SJun-ichiro itojun Hagino 			}
702a163d034SWarner Losh 			MGETHDR(n, M_DONTWAIT, m->m_type);
703686cdd19SJun-ichiro itojun Hagino 			if (n && maxlen > MHLEN) {
704a163d034SWarner Losh 				MCLGET(n, M_DONTWAIT);
705686cdd19SJun-ichiro itojun Hagino 				if ((n->m_flags & M_EXT) == 0) {
706686cdd19SJun-ichiro itojun Hagino 					m_free(n);
707686cdd19SJun-ichiro itojun Hagino 					n = NULL;
708686cdd19SJun-ichiro itojun Hagino 				}
709686cdd19SJun-ichiro itojun Hagino 			}
71031a94603SBruce M Simpson 			if (n && !m_dup_pkthdr(n, m, M_DONTWAIT)) {
7119967cafcSSam Leffler 				/*
7129967cafcSSam Leffler 				 * Previous code did a blind M_COPY_PKTHDR
7139967cafcSSam Leffler 				 * and said "just for rcvif".  If true, then
7149967cafcSSam Leffler 				 * we could tolerate the dup failing (due to
7159967cafcSSam Leffler 				 * the deep copy of the tag chain).  For now
7169967cafcSSam Leffler 				 * be conservative and just fail.
7179967cafcSSam Leffler 				 */
7189967cafcSSam Leffler 				m_free(n);
7199967cafcSSam Leffler 				n = NULL;
7209967cafcSSam Leffler 			}
72182cd038dSYoshinobu Inoue 			if (n == NULL) {
72282cd038dSYoshinobu Inoue 				/* Give up remote */
72382cd038dSYoshinobu Inoue 				break;
72482cd038dSYoshinobu Inoue 			}
72533841545SHajimu UMEMOTO 			n->m_pkthdr.rcvif = NULL;
726686cdd19SJun-ichiro itojun Hagino 			n->m_len = 0;
727686cdd19SJun-ichiro itojun Hagino 			maxhlen = M_TRAILINGSPACE(n) - maxlen;
72876ca6f88SJamie Gritton 			pr = curthread->td_ucred->cr_prison;
72976ca6f88SJamie Gritton 			mtx_lock(&pr->pr_mtx);
730c1f19219SJamie Gritton 			hlen = strlen(pr->pr_hostname);
73176ca6f88SJamie Gritton 			if (maxhlen > hlen)
73276ca6f88SJamie Gritton 				maxhlen = hlen;
73382cd038dSYoshinobu Inoue 			/*
73482cd038dSYoshinobu Inoue 			 * Copy IPv6 and ICMPv6 only.
73582cd038dSYoshinobu Inoue 			 */
73682cd038dSYoshinobu Inoue 			nip6 = mtod(n, struct ip6_hdr *);
73782cd038dSYoshinobu Inoue 			bcopy(ip6, nip6, sizeof(struct ip6_hdr));
73882cd038dSYoshinobu Inoue 			nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
73982cd038dSYoshinobu Inoue 			bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
74082cd038dSYoshinobu Inoue 			p = (u_char *)(nicmp6 + 1);
74182cd038dSYoshinobu Inoue 			bzero(p, 4);
742c1f19219SJamie Gritton 			/* meaningless TTL */
743c1f19219SJamie Gritton 			bcopy(pr->pr_hostname, p + 4, maxhlen);
74476ca6f88SJamie Gritton 			mtx_unlock(&pr->pr_mtx);
74582cd038dSYoshinobu Inoue 			noff = sizeof(struct ip6_hdr);
74682cd038dSYoshinobu Inoue 			n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
747686cdd19SJun-ichiro itojun Hagino 				sizeof(struct icmp6_hdr) + 4 + maxhlen;
74882cd038dSYoshinobu Inoue 			nicmp6->icmp6_type = ICMP6_WRUREPLY;
74982cd038dSYoshinobu Inoue 			nicmp6->icmp6_code = 0;
75082cd038dSYoshinobu Inoue 		}
75182cd038dSYoshinobu Inoue 		if (n) {
752e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_reflect);
753e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]);
75482cd038dSYoshinobu Inoue 			icmp6_reflect(n, noff);
75582cd038dSYoshinobu Inoue 		}
75682cd038dSYoshinobu Inoue 		break;
75782cd038dSYoshinobu Inoue 	    }
75882cd038dSYoshinobu Inoue 
75982cd038dSYoshinobu Inoue 	case ICMP6_WRUREPLY:
76082cd038dSYoshinobu Inoue 		if (code != 0)
76182cd038dSYoshinobu Inoue 			goto badcode;
76282cd038dSYoshinobu Inoue 		break;
76382cd038dSYoshinobu Inoue 
76482cd038dSYoshinobu Inoue 	case ND_ROUTER_SOLICIT:
76529dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_routersolicit);
76682cd038dSYoshinobu Inoue 		if (code != 0)
76782cd038dSYoshinobu Inoue 			goto badcode;
76882cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_router_solicit))
76982cd038dSYoshinobu Inoue 			goto badlen;
770a163d034SWarner Losh 		if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
771686cdd19SJun-ichiro itojun Hagino 			/* give up local */
7721db8d1f8SAna Kukec 
7731db8d1f8SAna Kukec 			/* Send incoming SeND packet to user space. */
7741db8d1f8SAna Kukec 			if (send_sendso_input_hook != NULL) {
7751db8d1f8SAna Kukec 				IP6_EXTHDR_CHECK(m, off,
7761db8d1f8SAna Kukec 				    icmp6len, IPPROTO_DONE);
7771db8d1f8SAna Kukec 				error = send_sendso_input_hook(m, ifp,
7781db8d1f8SAna Kukec 				    SND_IN, ip6len);
7791db8d1f8SAna Kukec 				/* -1 == no app on SEND socket */
7801db8d1f8SAna Kukec 				if (error == 0)
7811db8d1f8SAna Kukec 					return (IPPROTO_DONE);
7821db8d1f8SAna Kukec 				nd6_rs_input(m, off, icmp6len);
7831db8d1f8SAna Kukec 			} else
78482cd038dSYoshinobu Inoue 				nd6_rs_input(m, off, icmp6len);
785686cdd19SJun-ichiro itojun Hagino 			m = NULL;
786686cdd19SJun-ichiro itojun Hagino 			goto freeit;
787686cdd19SJun-ichiro itojun Hagino 		}
7881db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
789e7a6db74SAna Kukec 			IP6_EXTHDR_CHECK(n, off,
7901db8d1f8SAna Kukec 			    icmp6len, IPPROTO_DONE);
7911db8d1f8SAna Kukec                         error = send_sendso_input_hook(n, ifp,
7921db8d1f8SAna Kukec 			    SND_IN, ip6len);
793e7a6db74SAna Kukec 			if (error == 0)
794e7a6db74SAna Kukec 				goto freeit;
7951db8d1f8SAna Kukec 			/* -1 == no app on SEND socket */
7961db8d1f8SAna Kukec 			nd6_rs_input(n, off, icmp6len);
7971db8d1f8SAna Kukec 		} else
798686cdd19SJun-ichiro itojun Hagino 			nd6_rs_input(n, off, icmp6len);
79982cd038dSYoshinobu Inoue 		/* m stays. */
80082cd038dSYoshinobu Inoue 		break;
80182cd038dSYoshinobu Inoue 
80282cd038dSYoshinobu Inoue 	case ND_ROUTER_ADVERT:
80329dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_routeradvert);
80482cd038dSYoshinobu Inoue 		if (code != 0)
80582cd038dSYoshinobu Inoue 			goto badcode;
80682cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_router_advert))
80782cd038dSYoshinobu Inoue 			goto badlen;
808a163d034SWarner Losh 		if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
8091db8d1f8SAna Kukec 
8101db8d1f8SAna Kukec 			/* Send incoming SeND-protected/ND packet to user space. */
8111db8d1f8SAna Kukec 			if (send_sendso_input_hook != NULL) {
8121db8d1f8SAna Kukec 				error = send_sendso_input_hook(m, ifp,
8131db8d1f8SAna Kukec 				    SND_IN, ip6len);
8141db8d1f8SAna Kukec 				if (error == 0)
8151db8d1f8SAna Kukec 					return (IPPROTO_DONE);
8161db8d1f8SAna Kukec 				nd6_ra_input(m, off, icmp6len);
8171db8d1f8SAna Kukec 			} else
81882cd038dSYoshinobu Inoue 				nd6_ra_input(m, off, icmp6len);
819686cdd19SJun-ichiro itojun Hagino 			m = NULL;
820686cdd19SJun-ichiro itojun Hagino 			goto freeit;
821686cdd19SJun-ichiro itojun Hagino 		}
8221db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
8231db8d1f8SAna Kukec 			error = send_sendso_input_hook(n, ifp,
8241db8d1f8SAna Kukec 			    SND_IN, ip6len);
8251db8d1f8SAna Kukec 			if (error == 0)
826e7a6db74SAna Kukec 				goto freeit;
8271db8d1f8SAna Kukec 			nd6_ra_input(n, off, icmp6len);
8281db8d1f8SAna Kukec 		} else
829686cdd19SJun-ichiro itojun Hagino 			nd6_ra_input(n, off, icmp6len);
83082cd038dSYoshinobu Inoue 		/* m stays. */
83182cd038dSYoshinobu Inoue 		break;
83282cd038dSYoshinobu Inoue 
83382cd038dSYoshinobu Inoue 	case ND_NEIGHBOR_SOLICIT:
83429dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit);
83582cd038dSYoshinobu Inoue 		if (code != 0)
83682cd038dSYoshinobu Inoue 			goto badcode;
83782cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_neighbor_solicit))
83882cd038dSYoshinobu Inoue 			goto badlen;
839a163d034SWarner Losh 		if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
8401db8d1f8SAna Kukec 			if (send_sendso_input_hook != NULL) {
8411db8d1f8SAna Kukec 				error = send_sendso_input_hook(m, ifp,
8421db8d1f8SAna Kukec 				    SND_IN, ip6len);
8431db8d1f8SAna Kukec 				if (error == 0)
8441db8d1f8SAna Kukec 					return (IPPROTO_DONE);
84582cd038dSYoshinobu Inoue 				nd6_ns_input(m, off, icmp6len);
8461db8d1f8SAna Kukec 			} else
8471db8d1f8SAna Kukec 				nd6_ns_input(m, off, icmp6len);
848686cdd19SJun-ichiro itojun Hagino 			m = NULL;
849686cdd19SJun-ichiro itojun Hagino 			goto freeit;
850686cdd19SJun-ichiro itojun Hagino 		}
8511db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
8521db8d1f8SAna Kukec 			error = send_sendso_input_hook(n, ifp,
8531db8d1f8SAna Kukec 			    SND_IN, ip6len);
8541db8d1f8SAna Kukec 			if (error == 0)
855e7a6db74SAna Kukec 				goto freeit;
8561db8d1f8SAna Kukec 			nd6_ns_input(n, off, icmp6len);
8571db8d1f8SAna Kukec 		} else
858686cdd19SJun-ichiro itojun Hagino 			nd6_ns_input(n, off, icmp6len);
85982cd038dSYoshinobu Inoue 		/* m stays. */
86082cd038dSYoshinobu Inoue 		break;
86182cd038dSYoshinobu Inoue 
86282cd038dSYoshinobu Inoue 	case ND_NEIGHBOR_ADVERT:
86329dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert);
86482cd038dSYoshinobu Inoue 		if (code != 0)
86582cd038dSYoshinobu Inoue 			goto badcode;
86682cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_neighbor_advert))
86782cd038dSYoshinobu Inoue 			goto badlen;
868a163d034SWarner Losh 		if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
8691db8d1f8SAna Kukec 
8701db8d1f8SAna Kukec 			/* Send incoming SeND-protected/ND packet to user space. */
8711db8d1f8SAna Kukec 			if (send_sendso_input_hook != NULL) {
8721db8d1f8SAna Kukec 				error = send_sendso_input_hook(m, ifp,
8731db8d1f8SAna Kukec 				    SND_IN, ip6len);
8741db8d1f8SAna Kukec 				if (error == 0)
8751db8d1f8SAna Kukec 					return (IPPROTO_DONE);
87682cd038dSYoshinobu Inoue 				nd6_na_input(m, off, icmp6len);
8771db8d1f8SAna Kukec 			} else
8781db8d1f8SAna Kukec 				nd6_na_input(m, off, icmp6len);
879686cdd19SJun-ichiro itojun Hagino 			m = NULL;
880686cdd19SJun-ichiro itojun Hagino 			goto freeit;
881686cdd19SJun-ichiro itojun Hagino 		}
8821db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
8831db8d1f8SAna Kukec 			error = send_sendso_input_hook(n, ifp,
8841db8d1f8SAna Kukec 			    SND_IN, ip6len);
8851db8d1f8SAna Kukec 			if (error == 0)
886e7a6db74SAna Kukec 				goto freeit;
8871db8d1f8SAna Kukec 			nd6_na_input(n, off, icmp6len);
8881db8d1f8SAna Kukec 		} else
889686cdd19SJun-ichiro itojun Hagino 			nd6_na_input(n, off, icmp6len);
89082cd038dSYoshinobu Inoue 		/* m stays. */
89182cd038dSYoshinobu Inoue 		break;
89282cd038dSYoshinobu Inoue 
89382cd038dSYoshinobu Inoue 	case ND_REDIRECT:
89429dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_redirect);
89582cd038dSYoshinobu Inoue 		if (code != 0)
89682cd038dSYoshinobu Inoue 			goto badcode;
89782cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_redirect))
89882cd038dSYoshinobu Inoue 			goto badlen;
899a163d034SWarner Losh 		if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
9001db8d1f8SAna Kukec 			if (send_sendso_input_hook != NULL) {
9011db8d1f8SAna Kukec 				error = send_sendso_input_hook(m, ifp,
9021db8d1f8SAna Kukec 				    SND_IN, ip6len);
9031db8d1f8SAna Kukec 		 		if (error == 0)
9041db8d1f8SAna Kukec 					return (IPPROTO_DONE);
90582cd038dSYoshinobu Inoue 			    icmp6_redirect_input(m, off);
9061db8d1f8SAna Kukec 			} else
9071db8d1f8SAna Kukec 				icmp6_redirect_input(m, off);
908686cdd19SJun-ichiro itojun Hagino 			m = NULL;
909686cdd19SJun-ichiro itojun Hagino 			goto freeit;
910686cdd19SJun-ichiro itojun Hagino 		}
9111db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
9121db8d1f8SAna Kukec 			error = send_sendso_input_hook(n, ifp,
9131db8d1f8SAna Kukec 			    SND_IN, ip6len);
9141db8d1f8SAna Kukec 			if (error == 0)
915e7a6db74SAna Kukec 				goto freeit;
9161db8d1f8SAna Kukec 			icmp6_redirect_input(n, off);
9171db8d1f8SAna Kukec 		} else
918686cdd19SJun-ichiro itojun Hagino 			icmp6_redirect_input(n, off);
91982cd038dSYoshinobu Inoue 		/* m stays. */
92082cd038dSYoshinobu Inoue 		break;
92182cd038dSYoshinobu Inoue 
92282cd038dSYoshinobu Inoue 	case ICMP6_ROUTER_RENUMBERING:
92382cd038dSYoshinobu Inoue 		if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
92482cd038dSYoshinobu Inoue 		    code != ICMP6_ROUTER_RENUMBERING_RESULT)
92582cd038dSYoshinobu Inoue 			goto badcode;
92682cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct icmp6_router_renum))
92782cd038dSYoshinobu Inoue 			goto badlen;
92882cd038dSYoshinobu Inoue 		break;
92982cd038dSYoshinobu Inoue 
93082cd038dSYoshinobu Inoue 	default:
93133841545SHajimu UMEMOTO 		nd6log((LOG_DEBUG,
93233841545SHajimu UMEMOTO 		    "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
9331d54aa3bSBjoern A. Zeeb 		    icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
9341d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6bufd, &ip6->ip6_dst),
93529dc7bc6SBruce M Simpson 		    ifp ? ifp->if_index : 0));
93682cd038dSYoshinobu Inoue 		if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
93782cd038dSYoshinobu Inoue 			/* ICMPv6 error: MUST deliver it by spec... */
93882cd038dSYoshinobu Inoue 			code = PRC_NCMDS;
93982cd038dSYoshinobu Inoue 			/* deliver */
94082cd038dSYoshinobu Inoue 		} else {
94182cd038dSYoshinobu Inoue 			/* ICMPv6 informational: MUST not deliver */
94282cd038dSYoshinobu Inoue 			break;
94382cd038dSYoshinobu Inoue 		}
94482cd038dSYoshinobu Inoue 	deliver:
94514c129fcSBjoern A. Zeeb 		if (icmp6_notify_error(&m, off, icmp6len, code) != 0) {
94633841545SHajimu UMEMOTO 			/* In this case, m should've been freed. */
94733841545SHajimu UMEMOTO 			return (IPPROTO_DONE);
94833841545SHajimu UMEMOTO 		}
94933841545SHajimu UMEMOTO 		break;
95033841545SHajimu UMEMOTO 
95133841545SHajimu UMEMOTO 	badcode:
952e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_badcode);
95333841545SHajimu UMEMOTO 		break;
95433841545SHajimu UMEMOTO 
95533841545SHajimu UMEMOTO 	badlen:
956e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_badlen);
95733841545SHajimu UMEMOTO 		break;
95833841545SHajimu UMEMOTO 	}
95933841545SHajimu UMEMOTO 
96033841545SHajimu UMEMOTO 	/* deliver the packet to appropriate sockets */
96133841545SHajimu UMEMOTO 	icmp6_rip6_input(&m, *offp);
96233841545SHajimu UMEMOTO 
96333841545SHajimu UMEMOTO 	return IPPROTO_DONE;
96433841545SHajimu UMEMOTO 
96533841545SHajimu UMEMOTO  freeit:
96633841545SHajimu UMEMOTO 	m_freem(m);
96733841545SHajimu UMEMOTO 	return IPPROTO_DONE;
96833841545SHajimu UMEMOTO }
96933841545SHajimu UMEMOTO 
97033841545SHajimu UMEMOTO static int
9711272577eSXin LI icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code)
97233841545SHajimu UMEMOTO {
9739c0fda72SHajimu UMEMOTO 	struct mbuf *m = *mp;
97433841545SHajimu UMEMOTO 	struct icmp6_hdr *icmp6;
97533841545SHajimu UMEMOTO 	struct ip6_hdr *eip6;
97633841545SHajimu UMEMOTO 	u_int32_t notifymtu;
97733841545SHajimu UMEMOTO 	struct sockaddr_in6 icmp6src, icmp6dst;
97833841545SHajimu UMEMOTO 
97982cd038dSYoshinobu Inoue 	if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
980e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
98182cd038dSYoshinobu Inoue 		goto freeit;
98282cd038dSYoshinobu Inoue 	}
983686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
98482cd038dSYoshinobu Inoue 	IP6_EXTHDR_CHECK(m, off,
98506cd0a3fSHajimu UMEMOTO 	    sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1);
98682cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
987686cdd19SJun-ichiro itojun Hagino #else
988686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
989686cdd19SJun-ichiro itojun Hagino 	    sizeof(*icmp6) + sizeof(struct ip6_hdr));
990686cdd19SJun-ichiro itojun Hagino 	if (icmp6 == NULL) {
991e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
99233841545SHajimu UMEMOTO 		return (-1);
993686cdd19SJun-ichiro itojun Hagino 	}
994686cdd19SJun-ichiro itojun Hagino #endif
99533841545SHajimu UMEMOTO 	eip6 = (struct ip6_hdr *)(icmp6 + 1);
99682cd038dSYoshinobu Inoue 
99782cd038dSYoshinobu Inoue 	/* Detect the upper level protocol */
99882cd038dSYoshinobu Inoue 	{
9999233d8f3SDavid E. O'Brien 		void (*ctlfunc)(int, struct sockaddr *, void *);
100082cd038dSYoshinobu Inoue 		u_int8_t nxt = eip6->ip6_nxt;
100182cd038dSYoshinobu Inoue 		int eoff = off + sizeof(struct icmp6_hdr) +
100282cd038dSYoshinobu Inoue 		    sizeof(struct ip6_hdr);
100382cd038dSYoshinobu Inoue 		struct ip6ctlparam ip6cp;
1004686cdd19SJun-ichiro itojun Hagino 		struct in6_addr *finaldst = NULL;
1005686cdd19SJun-ichiro itojun Hagino 		int icmp6type = icmp6->icmp6_type;
1006686cdd19SJun-ichiro itojun Hagino 		struct ip6_frag *fh;
1007686cdd19SJun-ichiro itojun Hagino 		struct ip6_rthdr *rth;
1008686cdd19SJun-ichiro itojun Hagino 		struct ip6_rthdr0 *rth0;
1009686cdd19SJun-ichiro itojun Hagino 		int rthlen;
101082cd038dSYoshinobu Inoue 
101188ff5695SSUZUKI Shinsuke 		while (1) { /* XXX: should avoid infinite loop explicitly? */
101282cd038dSYoshinobu Inoue 			struct ip6_ext *eh;
101382cd038dSYoshinobu Inoue 
101482cd038dSYoshinobu Inoue 			switch (nxt) {
101582cd038dSYoshinobu Inoue 			case IPPROTO_HOPOPTS:
101682cd038dSYoshinobu Inoue 			case IPPROTO_DSTOPTS:
101782cd038dSYoshinobu Inoue 			case IPPROTO_AH:
1018686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
101906cd0a3fSHajimu UMEMOTO 				IP6_EXTHDR_CHECK(m, 0,
102006cd0a3fSHajimu UMEMOTO 				    eoff + sizeof(struct ip6_ext), -1);
10210527d333SHajimu UMEMOTO 				eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff);
1022686cdd19SJun-ichiro itojun Hagino #else
1023686cdd19SJun-ichiro itojun Hagino 				IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
1024686cdd19SJun-ichiro itojun Hagino 				    eoff, sizeof(*eh));
1025686cdd19SJun-ichiro itojun Hagino 				if (eh == NULL) {
1026e27b0c87SRobert Watson 					ICMP6STAT_INC(icp6s_tooshort);
102733841545SHajimu UMEMOTO 					return (-1);
1028686cdd19SJun-ichiro itojun Hagino 				}
1029686cdd19SJun-ichiro itojun Hagino #endif
1030686cdd19SJun-ichiro itojun Hagino 
103182cd038dSYoshinobu Inoue 				if (nxt == IPPROTO_AH)
103282cd038dSYoshinobu Inoue 					eoff += (eh->ip6e_len + 2) << 2;
103382cd038dSYoshinobu Inoue 				else
103482cd038dSYoshinobu Inoue 					eoff += (eh->ip6e_len + 1) << 3;
103582cd038dSYoshinobu Inoue 				nxt = eh->ip6e_nxt;
103682cd038dSYoshinobu Inoue 				break;
1037686cdd19SJun-ichiro itojun Hagino 			case IPPROTO_ROUTING:
1038686cdd19SJun-ichiro itojun Hagino 				/*
1039686cdd19SJun-ichiro itojun Hagino 				 * When the erroneous packet contains a
1040686cdd19SJun-ichiro itojun Hagino 				 * routing header, we should examine the
1041686cdd19SJun-ichiro itojun Hagino 				 * header to determine the final destination.
1042686cdd19SJun-ichiro itojun Hagino 				 * Otherwise, we can't properly update
1043686cdd19SJun-ichiro itojun Hagino 				 * information that depends on the final
1044686cdd19SJun-ichiro itojun Hagino 				 * destination (e.g. path MTU).
1045686cdd19SJun-ichiro itojun Hagino 				 */
1046686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
104706cd0a3fSHajimu UMEMOTO 				IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1);
104806cd0a3fSHajimu UMEMOTO 				rth = (struct ip6_rthdr *)
104906cd0a3fSHajimu UMEMOTO 				    (mtod(m, caddr_t) + eoff);
1050686cdd19SJun-ichiro itojun Hagino #else
1051686cdd19SJun-ichiro itojun Hagino 				IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
1052686cdd19SJun-ichiro itojun Hagino 				    eoff, sizeof(*rth));
1053686cdd19SJun-ichiro itojun Hagino 				if (rth == NULL) {
1054e27b0c87SRobert Watson 					ICMP6STAT_INC(icp6s_tooshort);
105533841545SHajimu UMEMOTO 					return (-1);
1056686cdd19SJun-ichiro itojun Hagino 				}
1057686cdd19SJun-ichiro itojun Hagino #endif
1058686cdd19SJun-ichiro itojun Hagino 				rthlen = (rth->ip6r_len + 1) << 3;
1059686cdd19SJun-ichiro itojun Hagino 				/*
1060686cdd19SJun-ichiro itojun Hagino 				 * XXX: currently there is no
1061686cdd19SJun-ichiro itojun Hagino 				 * officially defined type other
1062686cdd19SJun-ichiro itojun Hagino 				 * than type-0.
1063686cdd19SJun-ichiro itojun Hagino 				 * Note that if the segment left field
1064686cdd19SJun-ichiro itojun Hagino 				 * is 0, all intermediate hops must
1065686cdd19SJun-ichiro itojun Hagino 				 * have been passed.
1066686cdd19SJun-ichiro itojun Hagino 				 */
1067686cdd19SJun-ichiro itojun Hagino 				if (rth->ip6r_segleft &&
1068686cdd19SJun-ichiro itojun Hagino 				    rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
1069686cdd19SJun-ichiro itojun Hagino 					int hops;
1070686cdd19SJun-ichiro itojun Hagino 
1071686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
107206cd0a3fSHajimu UMEMOTO 					IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1);
107306cd0a3fSHajimu UMEMOTO 					rth0 = (struct ip6_rthdr0 *)
107406cd0a3fSHajimu UMEMOTO 					    (mtod(m, caddr_t) + eoff);
1075686cdd19SJun-ichiro itojun Hagino #else
1076686cdd19SJun-ichiro itojun Hagino 					IP6_EXTHDR_GET(rth0,
1077686cdd19SJun-ichiro itojun Hagino 					    struct ip6_rthdr0 *, m,
1078686cdd19SJun-ichiro itojun Hagino 					    eoff, rthlen);
1079686cdd19SJun-ichiro itojun Hagino 					if (rth0 == NULL) {
1080e27b0c87SRobert Watson 						ICMP6STAT_INC(icp6s_tooshort);
108133841545SHajimu UMEMOTO 						return (-1);
1082686cdd19SJun-ichiro itojun Hagino 					}
1083686cdd19SJun-ichiro itojun Hagino #endif
1084686cdd19SJun-ichiro itojun Hagino 					/* just ignore a bogus header */
1085686cdd19SJun-ichiro itojun Hagino 					if ((rth0->ip6r0_len % 2) == 0 &&
1086686cdd19SJun-ichiro itojun Hagino 					    (hops = rth0->ip6r0_len/2))
1087686cdd19SJun-ichiro itojun Hagino 						finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
1088686cdd19SJun-ichiro itojun Hagino 				}
1089686cdd19SJun-ichiro itojun Hagino 				eoff += rthlen;
1090686cdd19SJun-ichiro itojun Hagino 				nxt = rth->ip6r_nxt;
1091686cdd19SJun-ichiro itojun Hagino 				break;
1092686cdd19SJun-ichiro itojun Hagino 			case IPPROTO_FRAGMENT:
1093686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
1094686cdd19SJun-ichiro itojun Hagino 				IP6_EXTHDR_CHECK(m, 0, eoff +
109506cd0a3fSHajimu UMEMOTO 				    sizeof(struct ip6_frag), -1);
109606cd0a3fSHajimu UMEMOTO 				fh = (struct ip6_frag *)(mtod(m, caddr_t) +
109706cd0a3fSHajimu UMEMOTO 				    eoff);
1098686cdd19SJun-ichiro itojun Hagino #else
1099686cdd19SJun-ichiro itojun Hagino 				IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1100686cdd19SJun-ichiro itojun Hagino 				    eoff, sizeof(*fh));
1101686cdd19SJun-ichiro itojun Hagino 				if (fh == NULL) {
1102e27b0c87SRobert Watson 					ICMP6STAT_INC(icp6s_tooshort);
110333841545SHajimu UMEMOTO 					return (-1);
1104686cdd19SJun-ichiro itojun Hagino 				}
1105686cdd19SJun-ichiro itojun Hagino #endif
1106686cdd19SJun-ichiro itojun Hagino 				/*
1107686cdd19SJun-ichiro itojun Hagino 				 * Data after a fragment header is meaningless
1108686cdd19SJun-ichiro itojun Hagino 				 * unless it is the first fragment, but
1109686cdd19SJun-ichiro itojun Hagino 				 * we'll go to the notify label for path MTU
1110686cdd19SJun-ichiro itojun Hagino 				 * discovery.
1111686cdd19SJun-ichiro itojun Hagino 				 */
1112686cdd19SJun-ichiro itojun Hagino 				if (fh->ip6f_offlg & IP6F_OFF_MASK)
1113686cdd19SJun-ichiro itojun Hagino 					goto notify;
1114686cdd19SJun-ichiro itojun Hagino 
1115686cdd19SJun-ichiro itojun Hagino 				eoff += sizeof(struct ip6_frag);
1116686cdd19SJun-ichiro itojun Hagino 				nxt = fh->ip6f_nxt;
1117686cdd19SJun-ichiro itojun Hagino 				break;
111882cd038dSYoshinobu Inoue 			default:
1119686cdd19SJun-ichiro itojun Hagino 				/*
1120686cdd19SJun-ichiro itojun Hagino 				 * This case includes ESP and the No Next
1121686cdd19SJun-ichiro itojun Hagino 				 * Header.  In such cases going to the notify
1122686cdd19SJun-ichiro itojun Hagino 				 * label does not have any meaning
1123686cdd19SJun-ichiro itojun Hagino 				 * (i.e. ctlfunc will be NULL), but we go
1124686cdd19SJun-ichiro itojun Hagino 				 * anyway since we might have to update
1125686cdd19SJun-ichiro itojun Hagino 				 * path MTU information.
1126686cdd19SJun-ichiro itojun Hagino 				 */
112782cd038dSYoshinobu Inoue 				goto notify;
112882cd038dSYoshinobu Inoue 			}
112982cd038dSYoshinobu Inoue 		}
113082cd038dSYoshinobu Inoue 	  notify:
1131686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
113282cd038dSYoshinobu Inoue 		icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1133686cdd19SJun-ichiro itojun Hagino #else
1134686cdd19SJun-ichiro itojun Hagino 		IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1135686cdd19SJun-ichiro itojun Hagino 		    sizeof(*icmp6) + sizeof(struct ip6_hdr));
1136686cdd19SJun-ichiro itojun Hagino 		if (icmp6 == NULL) {
1137e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_tooshort);
113833841545SHajimu UMEMOTO 			return (-1);
1139686cdd19SJun-ichiro itojun Hagino 		}
1140686cdd19SJun-ichiro itojun Hagino #endif
114133841545SHajimu UMEMOTO 
114206cd0a3fSHajimu UMEMOTO 		/*
114306cd0a3fSHajimu UMEMOTO 		 * retrieve parameters from the inner IPv6 header, and convert
114406cd0a3fSHajimu UMEMOTO 		 * them into sockaddr structures.
114506cd0a3fSHajimu UMEMOTO 		 * XXX: there is no guarantee that the source or destination
114606cd0a3fSHajimu UMEMOTO 		 * addresses of the inner packet are in the same scope as
114706cd0a3fSHajimu UMEMOTO 		 * the addresses of the icmp packet.  But there is no other
114806cd0a3fSHajimu UMEMOTO 		 * way to determine the zone.
114906cd0a3fSHajimu UMEMOTO 		 */
115033841545SHajimu UMEMOTO 		eip6 = (struct ip6_hdr *)(icmp6 + 1);
115106cd0a3fSHajimu UMEMOTO 
115233841545SHajimu UMEMOTO 		bzero(&icmp6dst, sizeof(icmp6dst));
115333841545SHajimu UMEMOTO 		icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
115433841545SHajimu UMEMOTO 		icmp6dst.sin6_family = AF_INET6;
1155686cdd19SJun-ichiro itojun Hagino 		if (finaldst == NULL)
115633841545SHajimu UMEMOTO 			icmp6dst.sin6_addr = eip6->ip6_dst;
115733841545SHajimu UMEMOTO 		else
115833841545SHajimu UMEMOTO 			icmp6dst.sin6_addr = *finaldst;
1159a1f7e5f8SHajimu UMEMOTO 		if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
11609a4f9608SHajimu UMEMOTO 			goto freeit;
116133841545SHajimu UMEMOTO 		bzero(&icmp6src, sizeof(icmp6src));
116233841545SHajimu UMEMOTO 		icmp6src.sin6_len = sizeof(struct sockaddr_in6);
116333841545SHajimu UMEMOTO 		icmp6src.sin6_family = AF_INET6;
116433841545SHajimu UMEMOTO 		icmp6src.sin6_addr = eip6->ip6_src;
1165a1f7e5f8SHajimu UMEMOTO 		if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
11669a4f9608SHajimu UMEMOTO 			goto freeit;
1167a1f7e5f8SHajimu UMEMOTO 		icmp6src.sin6_flowinfo =
1168a1f7e5f8SHajimu UMEMOTO 		    (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
116933841545SHajimu UMEMOTO 
117033841545SHajimu UMEMOTO 		if (finaldst == NULL)
117133841545SHajimu UMEMOTO 			finaldst = &eip6->ip6_dst;
117233841545SHajimu UMEMOTO 		ip6cp.ip6c_m = m;
117333841545SHajimu UMEMOTO 		ip6cp.ip6c_icmp6 = icmp6;
117433841545SHajimu UMEMOTO 		ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
117533841545SHajimu UMEMOTO 		ip6cp.ip6c_off = eoff;
117633841545SHajimu UMEMOTO 		ip6cp.ip6c_finaldst = finaldst;
117733841545SHajimu UMEMOTO 		ip6cp.ip6c_src = &icmp6src;
117833841545SHajimu UMEMOTO 		ip6cp.ip6c_nxt = nxt;
117933841545SHajimu UMEMOTO 
1180e0bfbfceSBjoern A. Zeeb 		m_addr_changed(m);
1181e0bfbfceSBjoern A. Zeeb 
118233841545SHajimu UMEMOTO 		if (icmp6type == ICMP6_PACKET_TOO_BIG) {
118333841545SHajimu UMEMOTO 			notifymtu = ntohl(icmp6->icmp6_mtu);
118433841545SHajimu UMEMOTO 			ip6cp.ip6c_cmdarg = (void *)&notifymtu;
118533841545SHajimu UMEMOTO 			icmp6_mtudisc_update(&ip6cp, 1);	/*XXX*/
1186686cdd19SJun-ichiro itojun Hagino 		}
1187686cdd19SJun-ichiro itojun Hagino 
11889233d8f3SDavid E. O'Brien 		ctlfunc = (void (*)(int, struct sockaddr *, void *))
118982cd038dSYoshinobu Inoue 		    (inet6sw[ip6_protox[nxt]].pr_ctlinput);
119082cd038dSYoshinobu Inoue 		if (ctlfunc) {
119133841545SHajimu UMEMOTO 			(void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
119233841545SHajimu UMEMOTO 			    &ip6cp);
119382cd038dSYoshinobu Inoue 		}
119482cd038dSYoshinobu Inoue 	}
11959c0fda72SHajimu UMEMOTO 	*mp = m;
119633841545SHajimu UMEMOTO 	return (0);
119782cd038dSYoshinobu Inoue 
119882cd038dSYoshinobu Inoue   freeit:
119982cd038dSYoshinobu Inoue 	m_freem(m);
120033841545SHajimu UMEMOTO 	return (-1);
120182cd038dSYoshinobu Inoue }
120282cd038dSYoshinobu Inoue 
120333841545SHajimu UMEMOTO void
12041272577eSXin LI icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1205686cdd19SJun-ichiro itojun Hagino {
120633841545SHajimu UMEMOTO 	struct in6_addr *dst = ip6cp->ip6c_finaldst;
120733841545SHajimu UMEMOTO 	struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
120833841545SHajimu UMEMOTO 	struct mbuf *m = ip6cp->ip6c_m;	/* will be necessary for scope issue */
1209686cdd19SJun-ichiro itojun Hagino 	u_int mtu = ntohl(icmp6->icmp6_mtu);
121097d8d152SAndre Oppermann 	struct in_conninfo inc;
1211686cdd19SJun-ichiro itojun Hagino 
1212f95d4633SHajimu UMEMOTO #if 0
1213f95d4633SHajimu UMEMOTO 	/*
1214f95d4633SHajimu UMEMOTO 	 * RFC2460 section 5, last paragraph.
1215f95d4633SHajimu UMEMOTO 	 * even though minimum link MTU for IPv6 is IPV6_MMTU,
1216f95d4633SHajimu UMEMOTO 	 * we may see ICMPv6 too big with mtu < IPV6_MMTU
1217f95d4633SHajimu UMEMOTO 	 * due to packet translator in the middle.
1218f95d4633SHajimu UMEMOTO 	 * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
1219f95d4633SHajimu UMEMOTO 	 * special handling.
1220f95d4633SHajimu UMEMOTO 	 */
1221f95d4633SHajimu UMEMOTO 	if (mtu < IPV6_MMTU)
1222f95d4633SHajimu UMEMOTO 		return;
1223f95d4633SHajimu UMEMOTO #endif
1224f95d4633SHajimu UMEMOTO 
1225f95d4633SHajimu UMEMOTO 	/*
1226f95d4633SHajimu UMEMOTO 	 * we reject ICMPv6 too big with abnormally small value.
1227f95d4633SHajimu UMEMOTO 	 * XXX what is the good definition of "abnormally small"?
1228f95d4633SHajimu UMEMOTO 	 */
1229f95d4633SHajimu UMEMOTO 	if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1230f95d4633SHajimu UMEMOTO 		return;
1231f95d4633SHajimu UMEMOTO 
123233841545SHajimu UMEMOTO 	if (!validated)
123333841545SHajimu UMEMOTO 		return;
123433841545SHajimu UMEMOTO 
123559ca51adSSimon L. B. Nielsen 	/*
123659ca51adSSimon L. B. Nielsen 	 * In case the suggested mtu is less than IPV6_MMTU, we
123759ca51adSSimon L. B. Nielsen 	 * only need to remember that it was for above mentioned
123859ca51adSSimon L. B. Nielsen 	 * "alwaysfrag" case.
123959ca51adSSimon L. B. Nielsen 	 * Try to be as close to the spec as possible.
124059ca51adSSimon L. B. Nielsen 	 */
124159ca51adSSimon L. B. Nielsen 	if (mtu < IPV6_MMTU)
124259ca51adSSimon L. B. Nielsen 		mtu = IPV6_MMTU - 8;
124359ca51adSSimon L. B. Nielsen 
124497d8d152SAndre Oppermann 	bzero(&inc, sizeof(inc));
1245dcdb4371SBjoern A. Zeeb 	inc.inc_flags |= INC_ISIPV6;
124697d8d152SAndre Oppermann 	inc.inc6_faddr = *dst;
1247a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
1248a1f7e5f8SHajimu UMEMOTO 		return;
1249686cdd19SJun-ichiro itojun Hagino 
1250233dcce1SAndre Oppermann 	if (mtu < tcp_maxmtu6(&inc, NULL)) {
125197d8d152SAndre Oppermann 		tcp_hc_updatemtu(&inc, mtu);
1252e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_pmtuchg);
1253686cdd19SJun-ichiro itojun Hagino 	}
1254686cdd19SJun-ichiro itojun Hagino }
1255686cdd19SJun-ichiro itojun Hagino 
125682cd038dSYoshinobu Inoue /*
125733841545SHajimu UMEMOTO  * Process a Node Information Query packet, based on
125833841545SHajimu UMEMOTO  * draft-ietf-ipngwg-icmp-name-lookups-07.
1259686cdd19SJun-ichiro itojun Hagino  *
1260686cdd19SJun-ichiro itojun Hagino  * Spec incompatibilities:
1261686cdd19SJun-ichiro itojun Hagino  * - IPv6 Subject address handling
1262686cdd19SJun-ichiro itojun Hagino  * - IPv4 Subject address handling support missing
1263686cdd19SJun-ichiro itojun Hagino  * - Proxy reply (answer even if it's not for me)
1264686cdd19SJun-ichiro itojun Hagino  * - joins NI group address at in6_ifattach() time only, does not cope
1265686cdd19SJun-ichiro itojun Hagino  *   with hostname changes by sethostname(3)
126682cd038dSYoshinobu Inoue  */
126782cd038dSYoshinobu Inoue static struct mbuf *
12681272577eSXin LI ni6_input(struct mbuf *m, int off)
126982cd038dSYoshinobu Inoue {
1270686cdd19SJun-ichiro itojun Hagino 	struct icmp6_nodeinfo *ni6, *nni6;
127182cd038dSYoshinobu Inoue 	struct mbuf *n = NULL;
127276ca6f88SJamie Gritton 	struct prison *pr;
1273686cdd19SJun-ichiro itojun Hagino 	u_int16_t qtype;
1274686cdd19SJun-ichiro itojun Hagino 	int subjlen;
127582cd038dSYoshinobu Inoue 	int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
127682cd038dSYoshinobu Inoue 	struct ni_reply_fqdn *fqdn;
127782cd038dSYoshinobu Inoue 	int addrs;		/* for NI_QTYPE_NODEADDR */
127882cd038dSYoshinobu Inoue 	struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1279a1f7e5f8SHajimu UMEMOTO 	struct in6_addr in6_subj; /* subject address */
1280686cdd19SJun-ichiro itojun Hagino 	struct ip6_hdr *ip6;
1281686cdd19SJun-ichiro itojun Hagino 	int oldfqdn = 0;	/* if 1, return pascal string (03 draft) */
128233841545SHajimu UMEMOTO 	char *subj = NULL;
128333841545SHajimu UMEMOTO 	struct in6_ifaddr *ia6 = NULL;
128482cd038dSYoshinobu Inoue 
1285686cdd19SJun-ichiro itojun Hagino 	ip6 = mtod(m, struct ip6_hdr *);
1286686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
1287686cdd19SJun-ichiro itojun Hagino 	ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1288686cdd19SJun-ichiro itojun Hagino #else
1289686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1290686cdd19SJun-ichiro itojun Hagino 	if (ni6 == NULL) {
1291686cdd19SJun-ichiro itojun Hagino 		/* m is already reclaimed */
129206cd0a3fSHajimu UMEMOTO 		return (NULL);
1293686cdd19SJun-ichiro itojun Hagino 	}
1294686cdd19SJun-ichiro itojun Hagino #endif
1295686cdd19SJun-ichiro itojun Hagino 
1296686cdd19SJun-ichiro itojun Hagino 	/*
129718706985SJINMEI Tatuya 	 * Validate IPv6 source address.
129818706985SJINMEI Tatuya 	 * The default configuration MUST be to refuse answering queries from
129918706985SJINMEI Tatuya 	 * global-scope addresses according to RFC4602.
130018706985SJINMEI Tatuya 	 * Notes:
130118706985SJINMEI Tatuya 	 *  - it's not very clear what "refuse" means; this implementation
130218706985SJINMEI Tatuya 	 *    simply drops it.
130318706985SJINMEI Tatuya 	 *  - it's not very easy to identify global-scope (unicast) addresses
130418706985SJINMEI Tatuya 	 *    since there are many prefixes for them.  It should be safer
130518706985SJINMEI Tatuya 	 *    and in practice sufficient to check "all" but loopback and
130618706985SJINMEI Tatuya 	 *    link-local (note that site-local unicast was deprecated and
130718706985SJINMEI Tatuya 	 *    ULA is defined as global scope-wise)
130818706985SJINMEI Tatuya 	 */
1309603724d3SBjoern A. Zeeb 	if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
131018706985SJINMEI Tatuya 	    !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
131118706985SJINMEI Tatuya 	    !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
131218706985SJINMEI Tatuya 		goto bad;
131318706985SJINMEI Tatuya 
131418706985SJINMEI Tatuya 	/*
1315686cdd19SJun-ichiro itojun Hagino 	 * Validate IPv6 destination address.
1316686cdd19SJun-ichiro itojun Hagino 	 *
131733841545SHajimu UMEMOTO 	 * The Responder must discard the Query without further processing
131833841545SHajimu UMEMOTO 	 * unless it is one of the Responder's unicast or anycast addresses, or
131933841545SHajimu UMEMOTO 	 * a link-local scope multicast address which the Responder has joined.
132018706985SJINMEI Tatuya 	 * [RFC4602, Section 5.]
1321686cdd19SJun-ichiro itojun Hagino 	 */
13222a5aafceSHajimu UMEMOTO 	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
13232a5aafceSHajimu UMEMOTO 		if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
13242a5aafceSHajimu UMEMOTO 			goto bad;
13252a5aafceSHajimu UMEMOTO 		/* else it's a link-local multicast, fine */
13262a5aafceSHajimu UMEMOTO 	} else {		/* unicast or anycast */
13272a5aafceSHajimu UMEMOTO 		if ((ia6 = ip6_getdstifaddr(m)) == NULL)
13282a5aafceSHajimu UMEMOTO 			goto bad; /* XXX impossible */
13292a5aafceSHajimu UMEMOTO 
13302a5aafceSHajimu UMEMOTO 		if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1331603724d3SBjoern A. Zeeb 		    !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
13328c0fec80SRobert Watson 			ifa_free(&ia6->ia_ifa);
133333841545SHajimu UMEMOTO 			nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
133433841545SHajimu UMEMOTO 				"a temporary address in %s:%d",
133533841545SHajimu UMEMOTO 			       __FILE__, __LINE__));
133633841545SHajimu UMEMOTO 			goto bad;
133733841545SHajimu UMEMOTO 		}
13388c0fec80SRobert Watson 		ifa_free(&ia6->ia_ifa);
13392a5aafceSHajimu UMEMOTO 	}
1340686cdd19SJun-ichiro itojun Hagino 
1341686cdd19SJun-ichiro itojun Hagino 	/* validate query Subject field. */
134233841545SHajimu UMEMOTO 	qtype = ntohs(ni6->ni_qtype);
1343686cdd19SJun-ichiro itojun Hagino 	subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1344686cdd19SJun-ichiro itojun Hagino 	switch (qtype) {
1345686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_NOOP:
1346686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_SUPTYPES:
134733841545SHajimu UMEMOTO 		/* 07 draft */
134833841545SHajimu UMEMOTO 		if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1349686cdd19SJun-ichiro itojun Hagino 			break;
135033841545SHajimu UMEMOTO 		/* FALLTHROUGH */
1351686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_FQDN:
1352686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_NODEADDR:
1353a22adbc6SSUZUKI Shinsuke 	case NI_QTYPE_IPV4ADDR:
1354686cdd19SJun-ichiro itojun Hagino 		switch (ni6->ni_code) {
1355686cdd19SJun-ichiro itojun Hagino 		case ICMP6_NI_SUBJ_IPV6:
1356686cdd19SJun-ichiro itojun Hagino #if ICMP6_NI_SUBJ_IPV6 != 0
1357686cdd19SJun-ichiro itojun Hagino 		case 0:
1358686cdd19SJun-ichiro itojun Hagino #endif
1359686cdd19SJun-ichiro itojun Hagino 			/*
1360686cdd19SJun-ichiro itojun Hagino 			 * backward compatibility - try to accept 03 draft
1361686cdd19SJun-ichiro itojun Hagino 			 * format, where no Subject is present.
1362686cdd19SJun-ichiro itojun Hagino 			 */
136333841545SHajimu UMEMOTO 			if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
136433841545SHajimu UMEMOTO 			    subjlen == 0) {
1365686cdd19SJun-ichiro itojun Hagino 				oldfqdn++;
1366686cdd19SJun-ichiro itojun Hagino 				break;
1367686cdd19SJun-ichiro itojun Hagino 			}
136833841545SHajimu UMEMOTO #if ICMP6_NI_SUBJ_IPV6 != 0
136933841545SHajimu UMEMOTO 			if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
137033841545SHajimu UMEMOTO 				goto bad;
137133841545SHajimu UMEMOTO #endif
1372686cdd19SJun-ichiro itojun Hagino 
13732a5aafceSHajimu UMEMOTO 			if (subjlen != sizeof(struct in6_addr))
1374686cdd19SJun-ichiro itojun Hagino 				goto bad;
1375686cdd19SJun-ichiro itojun Hagino 
1376686cdd19SJun-ichiro itojun Hagino 			/*
1377686cdd19SJun-ichiro itojun Hagino 			 * Validate Subject address.
1378686cdd19SJun-ichiro itojun Hagino 			 *
137933841545SHajimu UMEMOTO 			 * Not sure what exactly "address belongs to the node"
138033841545SHajimu UMEMOTO 			 * means in the spec, is it just unicast, or what?
1381686cdd19SJun-ichiro itojun Hagino 			 *
1382686cdd19SJun-ichiro itojun Hagino 			 * At this moment we consider Subject address as
1383686cdd19SJun-ichiro itojun Hagino 			 * "belong to the node" if the Subject address equals
1384686cdd19SJun-ichiro itojun Hagino 			 * to the IPv6 destination address; validation for
1385686cdd19SJun-ichiro itojun Hagino 			 * IPv6 destination address should have done enough
1386686cdd19SJun-ichiro itojun Hagino 			 * check for us.
1387686cdd19SJun-ichiro itojun Hagino 			 *
1388686cdd19SJun-ichiro itojun Hagino 			 * We do not do proxy at this moment.
1389686cdd19SJun-ichiro itojun Hagino 			 */
1390686cdd19SJun-ichiro itojun Hagino 			/* m_pulldown instead of copy? */
1391686cdd19SJun-ichiro itojun Hagino 			m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1392a1f7e5f8SHajimu UMEMOTO 			    subjlen, (caddr_t)&in6_subj);
1393a1f7e5f8SHajimu UMEMOTO 			if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
13949a4f9608SHajimu UMEMOTO 				goto bad;
13952a5aafceSHajimu UMEMOTO 
1396a1f7e5f8SHajimu UMEMOTO 			subj = (char *)&in6_subj;
1397a1f7e5f8SHajimu UMEMOTO 			if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1398686cdd19SJun-ichiro itojun Hagino 				break;
139933841545SHajimu UMEMOTO 
1400686cdd19SJun-ichiro itojun Hagino 			/*
1401686cdd19SJun-ichiro itojun Hagino 			 * XXX if we are to allow other cases, we should really
1402686cdd19SJun-ichiro itojun Hagino 			 * be careful about scope here.
1403686cdd19SJun-ichiro itojun Hagino 			 * basically, we should disallow queries toward IPv6
140406cd0a3fSHajimu UMEMOTO 			 * destination X with subject Y,
140506cd0a3fSHajimu UMEMOTO 			 * if scope(X) > scope(Y).
1406686cdd19SJun-ichiro itojun Hagino 			 * if we allow scope(X) > scope(Y), it will result in
1407686cdd19SJun-ichiro itojun Hagino 			 * information leakage across scope boundary.
1408686cdd19SJun-ichiro itojun Hagino 			 */
1409686cdd19SJun-ichiro itojun Hagino 			goto bad;
1410686cdd19SJun-ichiro itojun Hagino 
1411686cdd19SJun-ichiro itojun Hagino 		case ICMP6_NI_SUBJ_FQDN:
1412686cdd19SJun-ichiro itojun Hagino 			/*
1413686cdd19SJun-ichiro itojun Hagino 			 * Validate Subject name with gethostname(3).
1414686cdd19SJun-ichiro itojun Hagino 			 *
1415686cdd19SJun-ichiro itojun Hagino 			 * The behavior may need some debate, since:
1416686cdd19SJun-ichiro itojun Hagino 			 * - we are not sure if the node has FQDN as
1417686cdd19SJun-ichiro itojun Hagino 			 *   hostname (returned by gethostname(3)).
1418686cdd19SJun-ichiro itojun Hagino 			 * - the code does wildcard match for truncated names.
1419686cdd19SJun-ichiro itojun Hagino 			 *   however, we are not sure if we want to perform
1420686cdd19SJun-ichiro itojun Hagino 			 *   wildcard match, if gethostname(3) side has
1421686cdd19SJun-ichiro itojun Hagino 			 *   truncated hostname.
1422686cdd19SJun-ichiro itojun Hagino 			 */
142376ca6f88SJamie Gritton 			pr = curthread->td_ucred->cr_prison;
142476ca6f88SJamie Gritton 			mtx_lock(&pr->pr_mtx);
1425c1f19219SJamie Gritton 			n = ni6_nametodns(pr->pr_hostname,
1426c1f19219SJamie Gritton 			    strlen(pr->pr_hostname), 0);
142776ca6f88SJamie Gritton 			mtx_unlock(&pr->pr_mtx);
1428686cdd19SJun-ichiro itojun Hagino 			if (!n || n->m_next || n->m_len == 0)
1429686cdd19SJun-ichiro itojun Hagino 				goto bad;
1430686cdd19SJun-ichiro itojun Hagino 			IP6_EXTHDR_GET(subj, char *, m,
1431686cdd19SJun-ichiro itojun Hagino 			    off + sizeof(struct icmp6_nodeinfo), subjlen);
1432686cdd19SJun-ichiro itojun Hagino 			if (subj == NULL)
1433686cdd19SJun-ichiro itojun Hagino 				goto bad;
1434686cdd19SJun-ichiro itojun Hagino 			if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1435686cdd19SJun-ichiro itojun Hagino 			    n->m_len)) {
1436686cdd19SJun-ichiro itojun Hagino 				goto bad;
1437686cdd19SJun-ichiro itojun Hagino 			}
1438686cdd19SJun-ichiro itojun Hagino 			m_freem(n);
1439686cdd19SJun-ichiro itojun Hagino 			n = NULL;
1440686cdd19SJun-ichiro itojun Hagino 			break;
1441686cdd19SJun-ichiro itojun Hagino 
144233841545SHajimu UMEMOTO 		case ICMP6_NI_SUBJ_IPV4:	/* XXX: to be implemented? */
1443686cdd19SJun-ichiro itojun Hagino 		default:
1444686cdd19SJun-ichiro itojun Hagino 			goto bad;
1445686cdd19SJun-ichiro itojun Hagino 		}
1446686cdd19SJun-ichiro itojun Hagino 		break;
1447686cdd19SJun-ichiro itojun Hagino 	}
1448686cdd19SJun-ichiro itojun Hagino 
144933841545SHajimu UMEMOTO 	/* refuse based on configuration.  XXX ICMP6_NI_REFUSED? */
145033841545SHajimu UMEMOTO 	switch (qtype) {
145133841545SHajimu UMEMOTO 	case NI_QTYPE_FQDN:
1452603724d3SBjoern A. Zeeb 		if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
145333841545SHajimu UMEMOTO 			goto bad;
145433841545SHajimu UMEMOTO 		break;
145533841545SHajimu UMEMOTO 	case NI_QTYPE_NODEADDR:
1456a22adbc6SSUZUKI Shinsuke 	case NI_QTYPE_IPV4ADDR:
1457603724d3SBjoern A. Zeeb 		if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
145833841545SHajimu UMEMOTO 			goto bad;
145933841545SHajimu UMEMOTO 		break;
146033841545SHajimu UMEMOTO 	}
146133841545SHajimu UMEMOTO 
146233841545SHajimu UMEMOTO 	/* guess reply length */
146333841545SHajimu UMEMOTO 	switch (qtype) {
146433841545SHajimu UMEMOTO 	case NI_QTYPE_NOOP:
146533841545SHajimu UMEMOTO 		break;		/* no reply data */
146633841545SHajimu UMEMOTO 	case NI_QTYPE_SUPTYPES:
146733841545SHajimu UMEMOTO 		replylen += sizeof(u_int32_t);
146833841545SHajimu UMEMOTO 		break;
146933841545SHajimu UMEMOTO 	case NI_QTYPE_FQDN:
147033841545SHajimu UMEMOTO 		/* XXX will append an mbuf */
147133841545SHajimu UMEMOTO 		replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
147233841545SHajimu UMEMOTO 		break;
147333841545SHajimu UMEMOTO 	case NI_QTYPE_NODEADDR:
1474c66b5feaSHajimu UMEMOTO 		addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
147533841545SHajimu UMEMOTO 		if ((replylen += addrs * (sizeof(struct in6_addr) +
147633841545SHajimu UMEMOTO 		    sizeof(u_int32_t))) > MCLBYTES)
147733841545SHajimu UMEMOTO 			replylen = MCLBYTES; /* XXX: will truncate pkt later */
147833841545SHajimu UMEMOTO 		break;
1479a22adbc6SSUZUKI Shinsuke 	case NI_QTYPE_IPV4ADDR:
1480a22adbc6SSUZUKI Shinsuke 		/* unsupported - should respond with unknown Qtype? */
1481a22adbc6SSUZUKI Shinsuke 		break;
148233841545SHajimu UMEMOTO 	default:
148333841545SHajimu UMEMOTO 		/*
148433841545SHajimu UMEMOTO 		 * XXX: We must return a reply with the ICMP6 code
148533841545SHajimu UMEMOTO 		 * `unknown Qtype' in this case.  However we regard the case
148633841545SHajimu UMEMOTO 		 * as an FQDN query for backward compatibility.
148733841545SHajimu UMEMOTO 		 * Older versions set a random value to this field,
148833841545SHajimu UMEMOTO 		 * so it rarely varies in the defined qtypes.
148933841545SHajimu UMEMOTO 		 * But the mechanism is not reliable...
149033841545SHajimu UMEMOTO 		 * maybe we should obsolete older versions.
149133841545SHajimu UMEMOTO 		 */
149233841545SHajimu UMEMOTO 		qtype = NI_QTYPE_FQDN;
149333841545SHajimu UMEMOTO 		/* XXX will append an mbuf */
149433841545SHajimu UMEMOTO 		replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
149533841545SHajimu UMEMOTO 		oldfqdn++;
149633841545SHajimu UMEMOTO 		break;
149733841545SHajimu UMEMOTO 	}
149833841545SHajimu UMEMOTO 
149933841545SHajimu UMEMOTO 	/* allocate an mbuf to reply. */
1500a163d034SWarner Losh 	MGETHDR(n, M_DONTWAIT, m->m_type);
1501686cdd19SJun-ichiro itojun Hagino 	if (n == NULL) {
1502686cdd19SJun-ichiro itojun Hagino 		m_freem(m);
150382cd038dSYoshinobu Inoue 		return (NULL);
1504686cdd19SJun-ichiro itojun Hagino 	}
15059967cafcSSam Leffler 	M_MOVE_PKTHDR(n, m); /* just for recvif */
150682cd038dSYoshinobu Inoue 	if (replylen > MHLEN) {
1507686cdd19SJun-ichiro itojun Hagino 		if (replylen > MCLBYTES) {
150882cd038dSYoshinobu Inoue 			/*
150933841545SHajimu UMEMOTO 			 * XXX: should we try to allocate more? But MCLBYTES
151033841545SHajimu UMEMOTO 			 * is probably much larger than IPV6_MMTU...
151182cd038dSYoshinobu Inoue 			 */
151282cd038dSYoshinobu Inoue 			goto bad;
1513686cdd19SJun-ichiro itojun Hagino 		}
1514a163d034SWarner Losh 		MCLGET(n, M_DONTWAIT);
151582cd038dSYoshinobu Inoue 		if ((n->m_flags & M_EXT) == 0) {
151682cd038dSYoshinobu Inoue 			goto bad;
151782cd038dSYoshinobu Inoue 		}
151882cd038dSYoshinobu Inoue 	}
151982cd038dSYoshinobu Inoue 	n->m_pkthdr.len = n->m_len = replylen;
152082cd038dSYoshinobu Inoue 
152182cd038dSYoshinobu Inoue 	/* copy mbuf header and IPv6 + Node Information base headers */
152282cd038dSYoshinobu Inoue 	bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
152382cd038dSYoshinobu Inoue 	nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1524686cdd19SJun-ichiro itojun Hagino 	bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
152582cd038dSYoshinobu Inoue 
152682cd038dSYoshinobu Inoue 	/* qtype dependent procedure */
152782cd038dSYoshinobu Inoue 	switch (qtype) {
152882cd038dSYoshinobu Inoue 	case NI_QTYPE_NOOP:
152933841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
153082cd038dSYoshinobu Inoue 		nni6->ni_flags = 0;
153182cd038dSYoshinobu Inoue 		break;
153282cd038dSYoshinobu Inoue 	case NI_QTYPE_SUPTYPES:
153333841545SHajimu UMEMOTO 	{
153433841545SHajimu UMEMOTO 		u_int32_t v;
153533841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
153633841545SHajimu UMEMOTO 		nni6->ni_flags = htons(0x0000);	/* raw bitmap */
153733841545SHajimu UMEMOTO 		/* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
153833841545SHajimu UMEMOTO 		v = (u_int32_t)htonl(0x0000000f);
153933841545SHajimu UMEMOTO 		bcopy(&v, nni6 + 1, sizeof(u_int32_t));
154082cd038dSYoshinobu Inoue 		break;
154133841545SHajimu UMEMOTO 	}
154282cd038dSYoshinobu Inoue 	case NI_QTYPE_FQDN:
154333841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
154482cd038dSYoshinobu Inoue 		fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
154506cd0a3fSHajimu UMEMOTO 		    sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
154682cd038dSYoshinobu Inoue 		nni6->ni_flags = 0; /* XXX: meaningless TTL */
154782cd038dSYoshinobu Inoue 		fqdn->ni_fqdn_ttl = 0;	/* ditto. */
1548686cdd19SJun-ichiro itojun Hagino 		/*
154976ca6f88SJamie Gritton 		 * XXX do we really have FQDN in hostname?
1550686cdd19SJun-ichiro itojun Hagino 		 */
155176ca6f88SJamie Gritton 		pr = curthread->td_ucred->cr_prison;
155276ca6f88SJamie Gritton 		mtx_lock(&pr->pr_mtx);
1553c1f19219SJamie Gritton 		n->m_next = ni6_nametodns(pr->pr_hostname,
1554c1f19219SJamie Gritton 		    strlen(pr->pr_hostname), oldfqdn);
155576ca6f88SJamie Gritton 		mtx_unlock(&pr->pr_mtx);
1556686cdd19SJun-ichiro itojun Hagino 		if (n->m_next == NULL)
1557686cdd19SJun-ichiro itojun Hagino 			goto bad;
1558686cdd19SJun-ichiro itojun Hagino 		/* XXX we assume that n->m_next is not a chain */
1559686cdd19SJun-ichiro itojun Hagino 		if (n->m_next->m_next != NULL)
1560686cdd19SJun-ichiro itojun Hagino 			goto bad;
1561686cdd19SJun-ichiro itojun Hagino 		n->m_pkthdr.len += n->m_next->m_len;
156282cd038dSYoshinobu Inoue 		break;
156382cd038dSYoshinobu Inoue 	case NI_QTYPE_NODEADDR:
156482cd038dSYoshinobu Inoue 	{
156582cd038dSYoshinobu Inoue 		int lenlim, copied;
156682cd038dSYoshinobu Inoue 
156733841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
156833841545SHajimu UMEMOTO 		n->m_pkthdr.len = n->m_len =
156933841545SHajimu UMEMOTO 		    sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
157033841545SHajimu UMEMOTO 		lenlim = M_TRAILINGSPACE(n);
157182cd038dSYoshinobu Inoue 		copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
157282cd038dSYoshinobu Inoue 		/* XXX: reset mbuf length */
157382cd038dSYoshinobu Inoue 		n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
157482cd038dSYoshinobu Inoue 		    sizeof(struct icmp6_nodeinfo) + copied;
157582cd038dSYoshinobu Inoue 		break;
157682cd038dSYoshinobu Inoue 	}
157782cd038dSYoshinobu Inoue 	default:
157882cd038dSYoshinobu Inoue 		break;		/* XXX impossible! */
157982cd038dSYoshinobu Inoue 	}
158082cd038dSYoshinobu Inoue 
158182cd038dSYoshinobu Inoue 	nni6->ni_type = ICMP6_NI_REPLY;
1582686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
158382cd038dSYoshinobu Inoue 	return (n);
158482cd038dSYoshinobu Inoue 
158582cd038dSYoshinobu Inoue   bad:
1586686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
158782cd038dSYoshinobu Inoue 	if (n)
158882cd038dSYoshinobu Inoue 		m_freem(n);
158982cd038dSYoshinobu Inoue 	return (NULL);
159082cd038dSYoshinobu Inoue }
159182cd038dSYoshinobu Inoue 
159282cd038dSYoshinobu Inoue /*
1593686cdd19SJun-ichiro itojun Hagino  * make a mbuf with DNS-encoded string.  no compression support.
1594686cdd19SJun-ichiro itojun Hagino  *
1595686cdd19SJun-ichiro itojun Hagino  * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1596686cdd19SJun-ichiro itojun Hagino  * treated as truncated name (two \0 at the end).  this is a wild guess.
15971272577eSXin LI  *
15981272577eSXin LI  * old - return pascal string if non-zero
1599686cdd19SJun-ichiro itojun Hagino  */
1600686cdd19SJun-ichiro itojun Hagino static struct mbuf *
16011272577eSXin LI ni6_nametodns(const char *name, int namelen, int old)
1602686cdd19SJun-ichiro itojun Hagino {
1603686cdd19SJun-ichiro itojun Hagino 	struct mbuf *m;
1604686cdd19SJun-ichiro itojun Hagino 	char *cp, *ep;
1605686cdd19SJun-ichiro itojun Hagino 	const char *p, *q;
1606686cdd19SJun-ichiro itojun Hagino 	int i, len, nterm;
1607686cdd19SJun-ichiro itojun Hagino 
1608686cdd19SJun-ichiro itojun Hagino 	if (old)
1609686cdd19SJun-ichiro itojun Hagino 		len = namelen + 1;
1610686cdd19SJun-ichiro itojun Hagino 	else
1611686cdd19SJun-ichiro itojun Hagino 		len = MCLBYTES;
1612686cdd19SJun-ichiro itojun Hagino 
1613686cdd19SJun-ichiro itojun Hagino 	/* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1614a163d034SWarner Losh 	MGET(m, M_DONTWAIT, MT_DATA);
1615686cdd19SJun-ichiro itojun Hagino 	if (m && len > MLEN) {
1616a163d034SWarner Losh 		MCLGET(m, M_DONTWAIT);
1617686cdd19SJun-ichiro itojun Hagino 		if ((m->m_flags & M_EXT) == 0)
1618686cdd19SJun-ichiro itojun Hagino 			goto fail;
1619686cdd19SJun-ichiro itojun Hagino 	}
1620686cdd19SJun-ichiro itojun Hagino 	if (!m)
1621686cdd19SJun-ichiro itojun Hagino 		goto fail;
1622686cdd19SJun-ichiro itojun Hagino 	m->m_next = NULL;
1623686cdd19SJun-ichiro itojun Hagino 
1624686cdd19SJun-ichiro itojun Hagino 	if (old) {
1625686cdd19SJun-ichiro itojun Hagino 		m->m_len = len;
1626686cdd19SJun-ichiro itojun Hagino 		*mtod(m, char *) = namelen;
1627686cdd19SJun-ichiro itojun Hagino 		bcopy(name, mtod(m, char *) + 1, namelen);
1628686cdd19SJun-ichiro itojun Hagino 		return m;
1629686cdd19SJun-ichiro itojun Hagino 	} else {
1630686cdd19SJun-ichiro itojun Hagino 		m->m_len = 0;
1631686cdd19SJun-ichiro itojun Hagino 		cp = mtod(m, char *);
1632686cdd19SJun-ichiro itojun Hagino 		ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1633686cdd19SJun-ichiro itojun Hagino 
1634686cdd19SJun-ichiro itojun Hagino 		/* if not certain about my name, return empty buffer */
1635686cdd19SJun-ichiro itojun Hagino 		if (namelen == 0)
1636686cdd19SJun-ichiro itojun Hagino 			return m;
1637686cdd19SJun-ichiro itojun Hagino 
1638686cdd19SJun-ichiro itojun Hagino 		/*
1639686cdd19SJun-ichiro itojun Hagino 		 * guess if it looks like shortened hostname, or FQDN.
1640686cdd19SJun-ichiro itojun Hagino 		 * shortened hostname needs two trailing "\0".
1641686cdd19SJun-ichiro itojun Hagino 		 */
1642686cdd19SJun-ichiro itojun Hagino 		i = 0;
1643686cdd19SJun-ichiro itojun Hagino 		for (p = name; p < name + namelen; p++) {
1644686cdd19SJun-ichiro itojun Hagino 			if (*p && *p == '.')
1645686cdd19SJun-ichiro itojun Hagino 				i++;
1646686cdd19SJun-ichiro itojun Hagino 		}
1647686cdd19SJun-ichiro itojun Hagino 		if (i < 2)
1648686cdd19SJun-ichiro itojun Hagino 			nterm = 2;
1649686cdd19SJun-ichiro itojun Hagino 		else
1650686cdd19SJun-ichiro itojun Hagino 			nterm = 1;
1651686cdd19SJun-ichiro itojun Hagino 
1652686cdd19SJun-ichiro itojun Hagino 		p = name;
1653686cdd19SJun-ichiro itojun Hagino 		while (cp < ep && p < name + namelen) {
1654686cdd19SJun-ichiro itojun Hagino 			i = 0;
1655686cdd19SJun-ichiro itojun Hagino 			for (q = p; q < name + namelen && *q && *q != '.'; q++)
1656686cdd19SJun-ichiro itojun Hagino 				i++;
1657686cdd19SJun-ichiro itojun Hagino 			/* result does not fit into mbuf */
1658686cdd19SJun-ichiro itojun Hagino 			if (cp + i + 1 >= ep)
1659686cdd19SJun-ichiro itojun Hagino 				goto fail;
1660610be6ceSHajimu UMEMOTO 			/*
1661610be6ceSHajimu UMEMOTO 			 * DNS label length restriction, RFC1035 page 8.
1662610be6ceSHajimu UMEMOTO 			 * "i == 0" case is included here to avoid returning
1663610be6ceSHajimu UMEMOTO 			 * 0-length label on "foo..bar".
1664610be6ceSHajimu UMEMOTO 			 */
1665610be6ceSHajimu UMEMOTO 			if (i <= 0 || i >= 64)
1666686cdd19SJun-ichiro itojun Hagino 				goto fail;
1667686cdd19SJun-ichiro itojun Hagino 			*cp++ = i;
1668686cdd19SJun-ichiro itojun Hagino 			bcopy(p, cp, i);
1669686cdd19SJun-ichiro itojun Hagino 			cp += i;
1670686cdd19SJun-ichiro itojun Hagino 			p = q;
1671686cdd19SJun-ichiro itojun Hagino 			if (p < name + namelen && *p == '.')
1672686cdd19SJun-ichiro itojun Hagino 				p++;
1673686cdd19SJun-ichiro itojun Hagino 		}
1674686cdd19SJun-ichiro itojun Hagino 		/* termination */
1675686cdd19SJun-ichiro itojun Hagino 		if (cp + nterm >= ep)
1676686cdd19SJun-ichiro itojun Hagino 			goto fail;
1677686cdd19SJun-ichiro itojun Hagino 		while (nterm-- > 0)
1678686cdd19SJun-ichiro itojun Hagino 			*cp++ = '\0';
1679686cdd19SJun-ichiro itojun Hagino 		m->m_len = cp - mtod(m, char *);
1680686cdd19SJun-ichiro itojun Hagino 		return m;
1681686cdd19SJun-ichiro itojun Hagino 	}
1682686cdd19SJun-ichiro itojun Hagino 
1683686cdd19SJun-ichiro itojun Hagino 	panic("should not reach here");
1684686cdd19SJun-ichiro itojun Hagino 	/* NOTREACHED */
1685686cdd19SJun-ichiro itojun Hagino 
1686686cdd19SJun-ichiro itojun Hagino  fail:
1687686cdd19SJun-ichiro itojun Hagino 	if (m)
1688686cdd19SJun-ichiro itojun Hagino 		m_freem(m);
1689686cdd19SJun-ichiro itojun Hagino 	return NULL;
1690686cdd19SJun-ichiro itojun Hagino }
1691686cdd19SJun-ichiro itojun Hagino 
1692686cdd19SJun-ichiro itojun Hagino /*
1693686cdd19SJun-ichiro itojun Hagino  * check if two DNS-encoded string matches.  takes care of truncated
1694686cdd19SJun-ichiro itojun Hagino  * form (with \0\0 at the end).  no compression support.
169533841545SHajimu UMEMOTO  * XXX upper/lowercase match (see RFC2065)
1696686cdd19SJun-ichiro itojun Hagino  */
1697686cdd19SJun-ichiro itojun Hagino static int
16981272577eSXin LI ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1699686cdd19SJun-ichiro itojun Hagino {
1700686cdd19SJun-ichiro itojun Hagino 	const char *a0, *b0;
1701686cdd19SJun-ichiro itojun Hagino 	int l;
1702686cdd19SJun-ichiro itojun Hagino 
1703686cdd19SJun-ichiro itojun Hagino 	/* simplest case - need validation? */
1704686cdd19SJun-ichiro itojun Hagino 	if (alen == blen && bcmp(a, b, alen) == 0)
1705686cdd19SJun-ichiro itojun Hagino 		return 1;
1706686cdd19SJun-ichiro itojun Hagino 
1707686cdd19SJun-ichiro itojun Hagino 	a0 = a;
1708686cdd19SJun-ichiro itojun Hagino 	b0 = b;
1709686cdd19SJun-ichiro itojun Hagino 
1710686cdd19SJun-ichiro itojun Hagino 	/* termination is mandatory */
1711686cdd19SJun-ichiro itojun Hagino 	if (alen < 2 || blen < 2)
1712686cdd19SJun-ichiro itojun Hagino 		return 0;
1713686cdd19SJun-ichiro itojun Hagino 	if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1714686cdd19SJun-ichiro itojun Hagino 		return 0;
1715686cdd19SJun-ichiro itojun Hagino 	alen--;
1716686cdd19SJun-ichiro itojun Hagino 	blen--;
1717686cdd19SJun-ichiro itojun Hagino 
1718686cdd19SJun-ichiro itojun Hagino 	while (a - a0 < alen && b - b0 < blen) {
1719686cdd19SJun-ichiro itojun Hagino 		if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1720686cdd19SJun-ichiro itojun Hagino 			return 0;
1721686cdd19SJun-ichiro itojun Hagino 
1722686cdd19SJun-ichiro itojun Hagino 		if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1723686cdd19SJun-ichiro itojun Hagino 			return 0;
1724686cdd19SJun-ichiro itojun Hagino 		/* we don't support compression yet */
1725686cdd19SJun-ichiro itojun Hagino 		if (a[0] >= 64 || b[0] >= 64)
1726686cdd19SJun-ichiro itojun Hagino 			return 0;
1727686cdd19SJun-ichiro itojun Hagino 
1728686cdd19SJun-ichiro itojun Hagino 		/* truncated case */
1729686cdd19SJun-ichiro itojun Hagino 		if (a[0] == 0 && a - a0 == alen - 1)
1730686cdd19SJun-ichiro itojun Hagino 			return 1;
1731686cdd19SJun-ichiro itojun Hagino 		if (b[0] == 0 && b - b0 == blen - 1)
1732686cdd19SJun-ichiro itojun Hagino 			return 1;
1733686cdd19SJun-ichiro itojun Hagino 		if (a[0] == 0 || b[0] == 0)
1734686cdd19SJun-ichiro itojun Hagino 			return 0;
1735686cdd19SJun-ichiro itojun Hagino 
1736686cdd19SJun-ichiro itojun Hagino 		if (a[0] != b[0])
1737686cdd19SJun-ichiro itojun Hagino 			return 0;
1738686cdd19SJun-ichiro itojun Hagino 		l = a[0];
1739686cdd19SJun-ichiro itojun Hagino 		if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1740686cdd19SJun-ichiro itojun Hagino 			return 0;
1741686cdd19SJun-ichiro itojun Hagino 		if (bcmp(a + 1, b + 1, l) != 0)
1742686cdd19SJun-ichiro itojun Hagino 			return 0;
1743686cdd19SJun-ichiro itojun Hagino 
1744686cdd19SJun-ichiro itojun Hagino 		a += 1 + l;
1745686cdd19SJun-ichiro itojun Hagino 		b += 1 + l;
1746686cdd19SJun-ichiro itojun Hagino 	}
1747686cdd19SJun-ichiro itojun Hagino 
1748686cdd19SJun-ichiro itojun Hagino 	if (a - a0 == alen && b - b0 == blen)
1749686cdd19SJun-ichiro itojun Hagino 		return 1;
1750686cdd19SJun-ichiro itojun Hagino 	else
1751686cdd19SJun-ichiro itojun Hagino 		return 0;
1752686cdd19SJun-ichiro itojun Hagino }
1753686cdd19SJun-ichiro itojun Hagino 
1754686cdd19SJun-ichiro itojun Hagino /*
175582cd038dSYoshinobu Inoue  * calculate the number of addresses to be returned in the node info reply.
175682cd038dSYoshinobu Inoue  */
175782cd038dSYoshinobu Inoue static int
17581272577eSXin LI ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
17591272577eSXin LI     struct in6_addr *subj)
176082cd038dSYoshinobu Inoue {
176133841545SHajimu UMEMOTO 	struct ifnet *ifp;
176233841545SHajimu UMEMOTO 	struct in6_ifaddr *ifa6;
176333841545SHajimu UMEMOTO 	struct ifaddr *ifa;
176482cd038dSYoshinobu Inoue 	int addrs = 0, addrsofif, iffound = 0;
176533841545SHajimu UMEMOTO 	int niflags = ni6->ni_flags;
176633841545SHajimu UMEMOTO 
176733841545SHajimu UMEMOTO 	if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
176833841545SHajimu UMEMOTO 		switch (ni6->ni_code) {
176933841545SHajimu UMEMOTO 		case ICMP6_NI_SUBJ_IPV6:
177033841545SHajimu UMEMOTO 			if (subj == NULL) /* must be impossible... */
177133841545SHajimu UMEMOTO 				return (0);
177233841545SHajimu UMEMOTO 			break;
177333841545SHajimu UMEMOTO 		default:
177433841545SHajimu UMEMOTO 			/*
177533841545SHajimu UMEMOTO 			 * XXX: we only support IPv6 subject address for
177633841545SHajimu UMEMOTO 			 * this Qtype.
177733841545SHajimu UMEMOTO 			 */
177833841545SHajimu UMEMOTO 			return (0);
177933841545SHajimu UMEMOTO 		}
178033841545SHajimu UMEMOTO 	}
178182cd038dSYoshinobu Inoue 
178277dfcdc4SRobert Watson 	IFNET_RLOCK_NOSLEEP();
1783603724d3SBjoern A. Zeeb 	for (ifp = TAILQ_FIRST(&V_ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
178482cd038dSYoshinobu Inoue 		addrsofif = 0;
17851e1d603eSRobert Watson 		IF_ADDR_LOCK(ifp);
1786c4dd3fe1SRobert Watson 		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
178782cd038dSYoshinobu Inoue 			if (ifa->ifa_addr->sa_family != AF_INET6)
178882cd038dSYoshinobu Inoue 				continue;
178982cd038dSYoshinobu Inoue 			ifa6 = (struct in6_ifaddr *)ifa;
179082cd038dSYoshinobu Inoue 
179133841545SHajimu UMEMOTO 			if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1792c66b5feaSHajimu UMEMOTO 			    IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
179382cd038dSYoshinobu Inoue 				iffound = 1;
179482cd038dSYoshinobu Inoue 
1795686cdd19SJun-ichiro itojun Hagino 			/*
1796686cdd19SJun-ichiro itojun Hagino 			 * IPv4-mapped addresses can only be returned by a
1797686cdd19SJun-ichiro itojun Hagino 			 * Node Information proxy, since they represent
1798686cdd19SJun-ichiro itojun Hagino 			 * addresses of IPv4-only nodes, which perforce do
1799686cdd19SJun-ichiro itojun Hagino 			 * not implement this protocol.
180033841545SHajimu UMEMOTO 			 * [icmp-name-lookups-07, Section 5.4]
1801686cdd19SJun-ichiro itojun Hagino 			 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1802686cdd19SJun-ichiro itojun Hagino 			 * this function at this moment.
1803686cdd19SJun-ichiro itojun Hagino 			 */
1804686cdd19SJun-ichiro itojun Hagino 
180582cd038dSYoshinobu Inoue 			/* What do we have to do about ::1? */
180682cd038dSYoshinobu Inoue 			switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
180782cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_LINKLOCAL:
180833841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
180933841545SHajimu UMEMOTO 					continue;
181082cd038dSYoshinobu Inoue 				break;
181182cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_SITELOCAL:
181233841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
181333841545SHajimu UMEMOTO 					continue;
181482cd038dSYoshinobu Inoue 				break;
181582cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_GLOBAL:
181633841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
181733841545SHajimu UMEMOTO 					continue;
181882cd038dSYoshinobu Inoue 				break;
181982cd038dSYoshinobu Inoue 			default:
182082cd038dSYoshinobu Inoue 				continue;
182182cd038dSYoshinobu Inoue 			}
182233841545SHajimu UMEMOTO 
182333841545SHajimu UMEMOTO 			/*
182433841545SHajimu UMEMOTO 			 * check if anycast is okay.
182533841545SHajimu UMEMOTO 			 * XXX: just experimental.  not in the spec.
182633841545SHajimu UMEMOTO 			 */
182733841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
182833841545SHajimu UMEMOTO 			    (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
182933841545SHajimu UMEMOTO 				continue; /* we need only unicast addresses */
183033841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1831603724d3SBjoern A. Zeeb 			    (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
183233841545SHajimu UMEMOTO 				continue;
183333841545SHajimu UMEMOTO 			}
183433841545SHajimu UMEMOTO 			addrsofif++; /* count the address */
183582cd038dSYoshinobu Inoue 		}
18361e1d603eSRobert Watson 		IF_ADDR_UNLOCK(ifp);
183782cd038dSYoshinobu Inoue 		if (iffound) {
183882cd038dSYoshinobu Inoue 			*ifpp = ifp;
183977dfcdc4SRobert Watson 			IFNET_RUNLOCK_NOSLEEP();
184082cd038dSYoshinobu Inoue 			return (addrsofif);
184182cd038dSYoshinobu Inoue 		}
184282cd038dSYoshinobu Inoue 
184382cd038dSYoshinobu Inoue 		addrs += addrsofif;
184482cd038dSYoshinobu Inoue 	}
184577dfcdc4SRobert Watson 	IFNET_RUNLOCK_NOSLEEP();
184682cd038dSYoshinobu Inoue 
184782cd038dSYoshinobu Inoue 	return (addrs);
184882cd038dSYoshinobu Inoue }
184982cd038dSYoshinobu Inoue 
185082cd038dSYoshinobu Inoue static int
18511272577eSXin LI ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
18521272577eSXin LI     struct ifnet *ifp0, int resid)
185382cd038dSYoshinobu Inoue {
1854*94e83133SJohn Baldwin 	struct ifnet *ifp;
185533841545SHajimu UMEMOTO 	struct in6_ifaddr *ifa6;
185633841545SHajimu UMEMOTO 	struct ifaddr *ifa;
185733841545SHajimu UMEMOTO 	struct ifnet *ifp_dep = NULL;
185833841545SHajimu UMEMOTO 	int copied = 0, allow_deprecated = 0;
185982cd038dSYoshinobu Inoue 	u_char *cp = (u_char *)(nni6 + 1);
186033841545SHajimu UMEMOTO 	int niflags = ni6->ni_flags;
186133841545SHajimu UMEMOTO 	u_int32_t ltime;
186282cd038dSYoshinobu Inoue 
186333841545SHajimu UMEMOTO 	if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
186482cd038dSYoshinobu Inoue 		return (0);	/* needless to copy */
186582cd038dSYoshinobu Inoue 
186677dfcdc4SRobert Watson 	IFNET_RLOCK_NOSLEEP();
1867*94e83133SJohn Baldwin 	ifp = ifp0 ? ifp0 : TAILQ_FIRST(&V_ifnet);
186833841545SHajimu UMEMOTO   again:
18690527d333SHajimu UMEMOTO 
187006cd0a3fSHajimu UMEMOTO 	for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
18711e1d603eSRobert Watson 		IF_ADDR_LOCK(ifp);
1872c4dd3fe1SRobert Watson 		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
187382cd038dSYoshinobu Inoue 			if (ifa->ifa_addr->sa_family != AF_INET6)
187482cd038dSYoshinobu Inoue 				continue;
187582cd038dSYoshinobu Inoue 			ifa6 = (struct in6_ifaddr *)ifa;
187682cd038dSYoshinobu Inoue 
187733841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
187833841545SHajimu UMEMOTO 			    allow_deprecated == 0) {
187933841545SHajimu UMEMOTO 				/*
188033841545SHajimu UMEMOTO 				 * prefererred address should be put before
188133841545SHajimu UMEMOTO 				 * deprecated addresses.
188233841545SHajimu UMEMOTO 				 */
188333841545SHajimu UMEMOTO 
188433841545SHajimu UMEMOTO 				/* record the interface for later search */
188533841545SHajimu UMEMOTO 				if (ifp_dep == NULL)
188633841545SHajimu UMEMOTO 					ifp_dep = ifp;
188733841545SHajimu UMEMOTO 
188882cd038dSYoshinobu Inoue 				continue;
188906cd0a3fSHajimu UMEMOTO 			} else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
189033841545SHajimu UMEMOTO 			    allow_deprecated != 0)
189133841545SHajimu UMEMOTO 				continue; /* we now collect deprecated addrs */
189282cd038dSYoshinobu Inoue 
189382cd038dSYoshinobu Inoue 			/* What do we have to do about ::1? */
189482cd038dSYoshinobu Inoue 			switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
189582cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_LINKLOCAL:
189633841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
189733841545SHajimu UMEMOTO 					continue;
189882cd038dSYoshinobu Inoue 				break;
189982cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_SITELOCAL:
190033841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
190133841545SHajimu UMEMOTO 					continue;
190282cd038dSYoshinobu Inoue 				break;
190382cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_GLOBAL:
190433841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
190533841545SHajimu UMEMOTO 					continue;
190682cd038dSYoshinobu Inoue 				break;
190782cd038dSYoshinobu Inoue 			default:
190882cd038dSYoshinobu Inoue 				continue;
190982cd038dSYoshinobu Inoue 			}
191082cd038dSYoshinobu Inoue 
191133841545SHajimu UMEMOTO 			/*
191233841545SHajimu UMEMOTO 			 * check if anycast is okay.
191333841545SHajimu UMEMOTO 			 * XXX: just experimental.  not in the spec.
191433841545SHajimu UMEMOTO 			 */
191533841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
191633841545SHajimu UMEMOTO 			    (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
191733841545SHajimu UMEMOTO 				continue;
191833841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1919603724d3SBjoern A. Zeeb 			    (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
192033841545SHajimu UMEMOTO 				continue;
192133841545SHajimu UMEMOTO 			}
192233841545SHajimu UMEMOTO 
192333841545SHajimu UMEMOTO 			/* now we can copy the address */
192433841545SHajimu UMEMOTO 			if (resid < sizeof(struct in6_addr) +
192533841545SHajimu UMEMOTO 			    sizeof(u_int32_t)) {
19261e1d603eSRobert Watson 				IF_ADDR_UNLOCK(ifp);
192782cd038dSYoshinobu Inoue 				/*
192882cd038dSYoshinobu Inoue 				 * We give up much more copy.
192982cd038dSYoshinobu Inoue 				 * Set the truncate flag and return.
193082cd038dSYoshinobu Inoue 				 */
193106cd0a3fSHajimu UMEMOTO 				nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
193277dfcdc4SRobert Watson 				IFNET_RUNLOCK_NOSLEEP();
193382cd038dSYoshinobu Inoue 				return (copied);
193482cd038dSYoshinobu Inoue 			}
193533841545SHajimu UMEMOTO 
193633841545SHajimu UMEMOTO 			/*
193733841545SHajimu UMEMOTO 			 * Set the TTL of the address.
193833841545SHajimu UMEMOTO 			 * The TTL value should be one of the following
193933841545SHajimu UMEMOTO 			 * according to the specification:
194033841545SHajimu UMEMOTO 			 *
194133841545SHajimu UMEMOTO 			 * 1. The remaining lifetime of a DHCP lease on the
194233841545SHajimu UMEMOTO 			 *    address, or
194333841545SHajimu UMEMOTO 			 * 2. The remaining Valid Lifetime of a prefix from
194433841545SHajimu UMEMOTO 			 *    which the address was derived through Stateless
194533841545SHajimu UMEMOTO 			 *    Autoconfiguration.
194633841545SHajimu UMEMOTO 			 *
194733841545SHajimu UMEMOTO 			 * Note that we currently do not support stateful
194833841545SHajimu UMEMOTO 			 * address configuration by DHCPv6, so the former
194933841545SHajimu UMEMOTO 			 * case can't happen.
195033841545SHajimu UMEMOTO 			 */
195133841545SHajimu UMEMOTO 			if (ifa6->ia6_lifetime.ia6t_expire == 0)
195233841545SHajimu UMEMOTO 				ltime = ND6_INFINITE_LIFETIME;
195333841545SHajimu UMEMOTO 			else {
195433841545SHajimu UMEMOTO 				if (ifa6->ia6_lifetime.ia6t_expire >
195533841545SHajimu UMEMOTO 				    time_second)
195633841545SHajimu UMEMOTO 					ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
195733841545SHajimu UMEMOTO 				else
195833841545SHajimu UMEMOTO 					ltime = 0;
195933841545SHajimu UMEMOTO 			}
196033841545SHajimu UMEMOTO 
196133841545SHajimu UMEMOTO 			bcopy(&ltime, cp, sizeof(u_int32_t));
196233841545SHajimu UMEMOTO 			cp += sizeof(u_int32_t);
196333841545SHajimu UMEMOTO 
196433841545SHajimu UMEMOTO 			/* copy the address itself */
196582cd038dSYoshinobu Inoue 			bcopy(&ifa6->ia_addr.sin6_addr, cp,
196682cd038dSYoshinobu Inoue 			    sizeof(struct in6_addr));
19679a4f9608SHajimu UMEMOTO 			in6_clearscope((struct in6_addr *)cp); /* XXX */
196882cd038dSYoshinobu Inoue 			cp += sizeof(struct in6_addr);
196933841545SHajimu UMEMOTO 
197033841545SHajimu UMEMOTO 			resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
197106cd0a3fSHajimu UMEMOTO 			copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
197282cd038dSYoshinobu Inoue 		}
19731e1d603eSRobert Watson 		IF_ADDR_UNLOCK(ifp);
197482cd038dSYoshinobu Inoue 		if (ifp0)	/* we need search only on the specified IF */
197582cd038dSYoshinobu Inoue 			break;
197682cd038dSYoshinobu Inoue 	}
197782cd038dSYoshinobu Inoue 
197833841545SHajimu UMEMOTO 	if (allow_deprecated == 0 && ifp_dep != NULL) {
197933841545SHajimu UMEMOTO 		ifp = ifp_dep;
198033841545SHajimu UMEMOTO 		allow_deprecated = 1;
198133841545SHajimu UMEMOTO 
198233841545SHajimu UMEMOTO 		goto again;
198333841545SHajimu UMEMOTO 	}
198433841545SHajimu UMEMOTO 
198577dfcdc4SRobert Watson 	IFNET_RUNLOCK_NOSLEEP();
1986b30a244cSJeffrey Hsu 
198782cd038dSYoshinobu Inoue 	return (copied);
198882cd038dSYoshinobu Inoue }
198982cd038dSYoshinobu Inoue 
199082cd038dSYoshinobu Inoue /*
199182cd038dSYoshinobu Inoue  * XXX almost dup'ed code with rip6_input.
199282cd038dSYoshinobu Inoue  */
199382cd038dSYoshinobu Inoue static int
19941272577eSXin LI icmp6_rip6_input(struct mbuf **mp, int off)
199582cd038dSYoshinobu Inoue {
199682cd038dSYoshinobu Inoue 	struct mbuf *m = *mp;
199733841545SHajimu UMEMOTO 	struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1998fc384fa5SBjoern A. Zeeb 	struct inpcb *in6p;
1999fc384fa5SBjoern A. Zeeb 	struct inpcb *last = NULL;
20009a4f9608SHajimu UMEMOTO 	struct sockaddr_in6 fromsa;
200182cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6;
200282cd038dSYoshinobu Inoue 	struct mbuf *opts = NULL;
200382cd038dSYoshinobu Inoue 
2004686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
200582cd038dSYoshinobu Inoue 	/* this is assumed to be safe. */
200682cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
2007686cdd19SJun-ichiro itojun Hagino #else
2008686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
2009686cdd19SJun-ichiro itojun Hagino 	if (icmp6 == NULL) {
2010686cdd19SJun-ichiro itojun Hagino 		/* m is already reclaimed */
201106cd0a3fSHajimu UMEMOTO 		return (IPPROTO_DONE);
2012686cdd19SJun-ichiro itojun Hagino 	}
2013686cdd19SJun-ichiro itojun Hagino #endif
201482cd038dSYoshinobu Inoue 
2015a1f7e5f8SHajimu UMEMOTO 	/*
2016a1f7e5f8SHajimu UMEMOTO 	 * XXX: the address may have embedded scope zone ID, which should be
2017a1f7e5f8SHajimu UMEMOTO 	 * hidden from applications.
2018a1f7e5f8SHajimu UMEMOTO 	 */
20199a4f9608SHajimu UMEMOTO 	bzero(&fromsa, sizeof(fromsa));
20209a4f9608SHajimu UMEMOTO 	fromsa.sin6_family = AF_INET6;
2021a1f7e5f8SHajimu UMEMOTO 	fromsa.sin6_len = sizeof(struct sockaddr_in6);
2022a1f7e5f8SHajimu UMEMOTO 	fromsa.sin6_addr = ip6->ip6_src;
2023a1f7e5f8SHajimu UMEMOTO 	if (sa6_recoverscope(&fromsa)) {
2024a1f7e5f8SHajimu UMEMOTO 		m_freem(m);
2025a1f7e5f8SHajimu UMEMOTO 		return (IPPROTO_DONE);
2026a1f7e5f8SHajimu UMEMOTO 	}
202782cd038dSYoshinobu Inoue 
2028603724d3SBjoern A. Zeeb 	INP_INFO_RLOCK(&V_ripcbinfo);
2029603724d3SBjoern A. Zeeb 	LIST_FOREACH(in6p, &V_ripcb, inp_list) {
2030b11e21aeSAlexander Motin 		if ((in6p->inp_vflag & INP_IPV6) == 0)
203182cd038dSYoshinobu Inoue 			continue;
2032fc384fa5SBjoern A. Zeeb 		if (in6p->inp_ip_p != IPPROTO_ICMPV6)
2033b11e21aeSAlexander Motin 			continue;
203482cd038dSYoshinobu Inoue 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
203582cd038dSYoshinobu Inoue 		   !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
2036b11e21aeSAlexander Motin 			continue;
203782cd038dSYoshinobu Inoue 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
203882cd038dSYoshinobu Inoue 		   !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
2039b11e21aeSAlexander Motin 			continue;
20406c5bbf5cSAlexander Motin 		INP_RLOCK(in6p);
20412f1ff0cdSRobert Watson 		if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
20426c5bbf5cSAlexander Motin 		    in6p->in6p_icmp6filt)) {
20436c5bbf5cSAlexander Motin 			INP_RUNLOCK(in6p);
2044b11e21aeSAlexander Motin 			continue;
20456c5bbf5cSAlexander Motin 		}
2046aba53ef0SKip Macy 		if (last != NULL) {
2047657db3c8SHajimu UMEMOTO 			struct	mbuf *n = NULL;
2048657db3c8SHajimu UMEMOTO 
2049657db3c8SHajimu UMEMOTO 			/*
2050657db3c8SHajimu UMEMOTO 			 * Recent network drivers tend to allocate a single
2051657db3c8SHajimu UMEMOTO 			 * mbuf cluster, rather than to make a couple of
2052657db3c8SHajimu UMEMOTO 			 * mbufs without clusters.  Also, since the IPv6 code
2053657db3c8SHajimu UMEMOTO 			 * path tries to avoid m_pullup(), it is highly
2054657db3c8SHajimu UMEMOTO 			 * probable that we still have an mbuf cluster here
2055657db3c8SHajimu UMEMOTO 			 * even though the necessary length can be stored in an
2056657db3c8SHajimu UMEMOTO 			 * mbuf's internal buffer.
2057657db3c8SHajimu UMEMOTO 			 * Meanwhile, the default size of the receive socket
2058657db3c8SHajimu UMEMOTO 			 * buffer for raw sockets is not so large.  This means
2059657db3c8SHajimu UMEMOTO 			 * the possibility of packet loss is relatively higher
2060657db3c8SHajimu UMEMOTO 			 * than before.  To avoid this scenario, we copy the
2061657db3c8SHajimu UMEMOTO 			 * received data to a separate mbuf that does not use
2062657db3c8SHajimu UMEMOTO 			 * a cluster, if possible.
2063657db3c8SHajimu UMEMOTO 			 * XXX: it is better to copy the data after stripping
2064657db3c8SHajimu UMEMOTO 			 * intermediate headers.
2065657db3c8SHajimu UMEMOTO 			 */
2066657db3c8SHajimu UMEMOTO 			if ((m->m_flags & M_EXT) && m->m_next == NULL &&
2067657db3c8SHajimu UMEMOTO 			    m->m_len <= MHLEN) {
2068657db3c8SHajimu UMEMOTO 				MGET(n, M_DONTWAIT, m->m_type);
2069657db3c8SHajimu UMEMOTO 				if (n != NULL) {
2070c543ec4eSGeorge V. Neville-Neil 					if (m_dup_pkthdr(n, m, M_NOWAIT)) {
2071c543ec4eSGeorge V. Neville-Neil 						bcopy(m->m_data, n->m_data,
2072c543ec4eSGeorge V. Neville-Neil 						      m->m_len);
2073657db3c8SHajimu UMEMOTO 						n->m_len = m->m_len;
2074c543ec4eSGeorge V. Neville-Neil 					} else {
2075c543ec4eSGeorge V. Neville-Neil 						m_free(n);
2076c543ec4eSGeorge V. Neville-Neil 						n = NULL;
2077c543ec4eSGeorge V. Neville-Neil 					}
2078657db3c8SHajimu UMEMOTO 				}
2079657db3c8SHajimu UMEMOTO 			}
2080657db3c8SHajimu UMEMOTO 			if (n != NULL ||
2081657db3c8SHajimu UMEMOTO 			    (n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
208297590249SBjoern A. Zeeb 				if (last->inp_flags & INP_CONTROLOPTS)
208311de19f4SHajimu UMEMOTO 					ip6_savecontrol(last, n, &opts);
208482cd038dSYoshinobu Inoue 				/* strip intermediate headers */
208582cd038dSYoshinobu Inoue 				m_adj(n, off);
2086fc384fa5SBjoern A. Zeeb 				SOCKBUF_LOCK(&last->inp_socket->so_rcv);
2087c9db0fadSRobert Watson 				if (sbappendaddr_locked(
2088fc384fa5SBjoern A. Zeeb 				    &last->inp_socket->so_rcv,
20899a4f9608SHajimu UMEMOTO 				    (struct sockaddr *)&fromsa, n, opts)
209006cd0a3fSHajimu UMEMOTO 				    == 0) {
209182cd038dSYoshinobu Inoue 					/* should notify about lost packet */
209282cd038dSYoshinobu Inoue 					m_freem(n);
209333841545SHajimu UMEMOTO 					if (opts) {
209482cd038dSYoshinobu Inoue 						m_freem(opts);
209533841545SHajimu UMEMOTO 					}
2096c9db0fadSRobert Watson 					SOCKBUF_UNLOCK(
2097fc384fa5SBjoern A. Zeeb 					    &last->inp_socket->so_rcv);
20984cc20ab1SSeigo Tanimura 				} else
2099fc384fa5SBjoern A. Zeeb 					sorwakeup_locked(last->inp_socket);
210082cd038dSYoshinobu Inoue 				opts = NULL;
210182cd038dSYoshinobu Inoue 			}
2102bb145f60SRobert Watson 			INP_RUNLOCK(last);
210382cd038dSYoshinobu Inoue 		}
210482cd038dSYoshinobu Inoue 		last = in6p;
210582cd038dSYoshinobu Inoue 	}
2106603724d3SBjoern A. Zeeb 	INP_INFO_RUNLOCK(&V_ripcbinfo);
2107aba53ef0SKip Macy 	if (last != NULL) {
210897590249SBjoern A. Zeeb 		if (last->inp_flags & INP_CONTROLOPTS)
210911de19f4SHajimu UMEMOTO 			ip6_savecontrol(last, m, &opts);
211082cd038dSYoshinobu Inoue 		/* strip intermediate headers */
211182cd038dSYoshinobu Inoue 		m_adj(m, off);
2112657db3c8SHajimu UMEMOTO 
2113657db3c8SHajimu UMEMOTO 		/* avoid using mbuf clusters if possible (see above) */
2114657db3c8SHajimu UMEMOTO 		if ((m->m_flags & M_EXT) && m->m_next == NULL &&
2115657db3c8SHajimu UMEMOTO 		    m->m_len <= MHLEN) {
2116657db3c8SHajimu UMEMOTO 			struct mbuf *n;
2117657db3c8SHajimu UMEMOTO 
2118657db3c8SHajimu UMEMOTO 			MGET(n, M_DONTWAIT, m->m_type);
2119657db3c8SHajimu UMEMOTO 			if (n != NULL) {
2120c543ec4eSGeorge V. Neville-Neil 				if (m_dup_pkthdr(n, m, M_NOWAIT)) {
2121657db3c8SHajimu UMEMOTO 					bcopy(m->m_data, n->m_data, m->m_len);
2122657db3c8SHajimu UMEMOTO 					n->m_len = m->m_len;
2123657db3c8SHajimu UMEMOTO 
2124657db3c8SHajimu UMEMOTO 					m_freem(m);
2125657db3c8SHajimu UMEMOTO 					m = n;
2126c543ec4eSGeorge V. Neville-Neil 				} else {
2127c543ec4eSGeorge V. Neville-Neil 					m_freem(n);
2128c543ec4eSGeorge V. Neville-Neil 					n = NULL;
2129c543ec4eSGeorge V. Neville-Neil 				}
2130657db3c8SHajimu UMEMOTO 			}
2131657db3c8SHajimu UMEMOTO 		}
2132fc384fa5SBjoern A. Zeeb 		SOCKBUF_LOCK(&last->inp_socket->so_rcv);
2133fc384fa5SBjoern A. Zeeb 		if (sbappendaddr_locked(&last->inp_socket->so_rcv,
21349a4f9608SHajimu UMEMOTO 		    (struct sockaddr *)&fromsa, m, opts) == 0) {
213582cd038dSYoshinobu Inoue 			m_freem(m);
213682cd038dSYoshinobu Inoue 			if (opts)
213782cd038dSYoshinobu Inoue 				m_freem(opts);
2138fc384fa5SBjoern A. Zeeb 			SOCKBUF_UNLOCK(&last->inp_socket->so_rcv);
21394cc20ab1SSeigo Tanimura 		} else
2140fc384fa5SBjoern A. Zeeb 			sorwakeup_locked(last->inp_socket);
2141bb145f60SRobert Watson 		INP_RUNLOCK(last);
214282cd038dSYoshinobu Inoue 	} else {
214382cd038dSYoshinobu Inoue 		m_freem(m);
214433cde130SBruce M Simpson 		IP6STAT_DEC(ip6s_delivered);
214582cd038dSYoshinobu Inoue 	}
214682cd038dSYoshinobu Inoue 	return IPPROTO_DONE;
214782cd038dSYoshinobu Inoue }
214882cd038dSYoshinobu Inoue 
214982cd038dSYoshinobu Inoue /*
215082cd038dSYoshinobu Inoue  * Reflect the ip6 packet back to the source.
2151686cdd19SJun-ichiro itojun Hagino  * OFF points to the icmp6 header, counted from the top of the mbuf.
215282cd038dSYoshinobu Inoue  */
215382cd038dSYoshinobu Inoue void
21541272577eSXin LI icmp6_reflect(struct mbuf *m, size_t off)
215582cd038dSYoshinobu Inoue {
2156686cdd19SJun-ichiro itojun Hagino 	struct ip6_hdr *ip6;
215782cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6;
21588c0fec80SRobert Watson 	struct in6_ifaddr *ia = NULL;
2159686cdd19SJun-ichiro itojun Hagino 	int plen;
216082cd038dSYoshinobu Inoue 	int type, code;
216182cd038dSYoshinobu Inoue 	struct ifnet *outif = NULL;
216288d166bfSBjoern A. Zeeb 	struct in6_addr origdst, src, *srcp = NULL;
216382cd038dSYoshinobu Inoue 
2164686cdd19SJun-ichiro itojun Hagino 	/* too short to reflect */
2165686cdd19SJun-ichiro itojun Hagino 	if (off < sizeof(struct ip6_hdr)) {
216633841545SHajimu UMEMOTO 		nd6log((LOG_DEBUG,
216733841545SHajimu UMEMOTO 		    "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2168686cdd19SJun-ichiro itojun Hagino 		    (u_long)off, (u_long)sizeof(struct ip6_hdr),
216933841545SHajimu UMEMOTO 		    __FILE__, __LINE__));
2170686cdd19SJun-ichiro itojun Hagino 		goto bad;
2171686cdd19SJun-ichiro itojun Hagino 	}
2172686cdd19SJun-ichiro itojun Hagino 
217382cd038dSYoshinobu Inoue 	/*
217482cd038dSYoshinobu Inoue 	 * If there are extra headers between IPv6 and ICMPv6, strip
217582cd038dSYoshinobu Inoue 	 * off that header first.
217682cd038dSYoshinobu Inoue 	 */
2177686cdd19SJun-ichiro itojun Hagino #ifdef DIAGNOSTIC
2178686cdd19SJun-ichiro itojun Hagino 	if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2179686cdd19SJun-ichiro itojun Hagino 		panic("assumption failed in icmp6_reflect");
2180686cdd19SJun-ichiro itojun Hagino #endif
2181686cdd19SJun-ichiro itojun Hagino 	if (off > sizeof(struct ip6_hdr)) {
2182686cdd19SJun-ichiro itojun Hagino 		size_t l;
2183686cdd19SJun-ichiro itojun Hagino 		struct ip6_hdr nip6;
218482cd038dSYoshinobu Inoue 
2185686cdd19SJun-ichiro itojun Hagino 		l = off - sizeof(struct ip6_hdr);
2186686cdd19SJun-ichiro itojun Hagino 		m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2187686cdd19SJun-ichiro itojun Hagino 		m_adj(m, l);
2188686cdd19SJun-ichiro itojun Hagino 		l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2189686cdd19SJun-ichiro itojun Hagino 		if (m->m_len < l) {
2190686cdd19SJun-ichiro itojun Hagino 			if ((m = m_pullup(m, l)) == NULL)
2191686cdd19SJun-ichiro itojun Hagino 				return;
219282cd038dSYoshinobu Inoue 		}
2193686cdd19SJun-ichiro itojun Hagino 		bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2194686cdd19SJun-ichiro itojun Hagino 	} else /* off == sizeof(struct ip6_hdr) */ {
2195686cdd19SJun-ichiro itojun Hagino 		size_t l;
2196686cdd19SJun-ichiro itojun Hagino 		l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2197686cdd19SJun-ichiro itojun Hagino 		if (m->m_len < l) {
2198686cdd19SJun-ichiro itojun Hagino 			if ((m = m_pullup(m, l)) == NULL)
2199686cdd19SJun-ichiro itojun Hagino 				return;
220082cd038dSYoshinobu Inoue 		}
2201686cdd19SJun-ichiro itojun Hagino 	}
2202686cdd19SJun-ichiro itojun Hagino 	plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
220382cd038dSYoshinobu Inoue 	ip6 = mtod(m, struct ip6_hdr *);
220482cd038dSYoshinobu Inoue 	ip6->ip6_nxt = IPPROTO_ICMPV6;
220582cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)(ip6 + 1);
220682cd038dSYoshinobu Inoue 	type = icmp6->icmp6_type; /* keep type for statistics */
220782cd038dSYoshinobu Inoue 	code = icmp6->icmp6_code; /* ditto. */
220882cd038dSYoshinobu Inoue 
2209a1f7e5f8SHajimu UMEMOTO 	origdst = ip6->ip6_dst;
221082cd038dSYoshinobu Inoue 	/*
221182cd038dSYoshinobu Inoue 	 * ip6_input() drops a packet if its src is multicast.
221282cd038dSYoshinobu Inoue 	 * So, the src is never multicast.
221382cd038dSYoshinobu Inoue 	 */
221482cd038dSYoshinobu Inoue 	ip6->ip6_dst = ip6->ip6_src;
221582cd038dSYoshinobu Inoue 
221682cd038dSYoshinobu Inoue 	/*
221782cd038dSYoshinobu Inoue 	 * If the incoming packet was addressed directly to us (i.e. unicast),
221882cd038dSYoshinobu Inoue 	 * use dst as the src for the reply.
221906cd0a3fSHajimu UMEMOTO 	 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2220686cdd19SJun-ichiro itojun Hagino 	 * (for example) when we encounter an error while forwarding procedure
2221686cdd19SJun-ichiro itojun Hagino 	 * destined to a duplicated address of ours.
2222a1f7e5f8SHajimu UMEMOTO 	 * Note that ip6_getdstifaddr() may fail if we are in an error handling
2223a1f7e5f8SHajimu UMEMOTO 	 * procedure of an outgoing packet of our own, in which case we need
2224a1f7e5f8SHajimu UMEMOTO 	 * to search in the ifaddr list.
222582cd038dSYoshinobu Inoue 	 */
2226a1f7e5f8SHajimu UMEMOTO 	if (!IN6_IS_ADDR_MULTICAST(&origdst)) {
2227a1f7e5f8SHajimu UMEMOTO 		if ((ia = ip6_getdstifaddr(m))) {
2228a1f7e5f8SHajimu UMEMOTO 			if (!(ia->ia6_flags &
2229a1f7e5f8SHajimu UMEMOTO 			    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)))
223088d166bfSBjoern A. Zeeb 				srcp = &ia->ia_addr.sin6_addr;
2231a1f7e5f8SHajimu UMEMOTO 		} else {
2232a1f7e5f8SHajimu UMEMOTO 			struct sockaddr_in6 d;
2233a1f7e5f8SHajimu UMEMOTO 
2234a1f7e5f8SHajimu UMEMOTO 			bzero(&d, sizeof(d));
2235a1f7e5f8SHajimu UMEMOTO 			d.sin6_family = AF_INET6;
2236a1f7e5f8SHajimu UMEMOTO 			d.sin6_len = sizeof(d);
2237a1f7e5f8SHajimu UMEMOTO 			d.sin6_addr = origdst;
2238a1f7e5f8SHajimu UMEMOTO 			ia = (struct in6_ifaddr *)
2239a1f7e5f8SHajimu UMEMOTO 			    ifa_ifwithaddr((struct sockaddr *)&d);
2240a1f7e5f8SHajimu UMEMOTO 			if (ia &&
2241a1f7e5f8SHajimu UMEMOTO 			    !(ia->ia6_flags &
2242a1f7e5f8SHajimu UMEMOTO 			    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
224388d166bfSBjoern A. Zeeb 				srcp = &ia->ia_addr.sin6_addr;
224482cd038dSYoshinobu Inoue 			}
2245a1f7e5f8SHajimu UMEMOTO 		}
224682cd038dSYoshinobu Inoue 	}
224782cd038dSYoshinobu Inoue 
224888d166bfSBjoern A. Zeeb 	if (srcp == NULL) {
224933841545SHajimu UMEMOTO 		int e;
2250a1f7e5f8SHajimu UMEMOTO 		struct sockaddr_in6 sin6;
225133841545SHajimu UMEMOTO 		struct route_in6 ro;
225233841545SHajimu UMEMOTO 
225382cd038dSYoshinobu Inoue 		/*
2254686cdd19SJun-ichiro itojun Hagino 		 * This case matches to multicasts, our anycast, or unicasts
225533841545SHajimu UMEMOTO 		 * that we do not own.  Select a source address based on the
225633841545SHajimu UMEMOTO 		 * source address of the erroneous packet.
225782cd038dSYoshinobu Inoue 		 */
2258a1f7e5f8SHajimu UMEMOTO 		bzero(&sin6, sizeof(sin6));
2259a1f7e5f8SHajimu UMEMOTO 		sin6.sin6_family = AF_INET6;
2260a1f7e5f8SHajimu UMEMOTO 		sin6.sin6_len = sizeof(sin6);
2261a1f7e5f8SHajimu UMEMOTO 		sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */
2262a1f7e5f8SHajimu UMEMOTO 
226333841545SHajimu UMEMOTO 		bzero(&ro, sizeof(ro));
226488d166bfSBjoern A. Zeeb 		e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, &outif, &src);
226533841545SHajimu UMEMOTO 		if (ro.ro_rt)
226633841545SHajimu UMEMOTO 			RTFREE(ro.ro_rt); /* XXX: we could use this */
226788d166bfSBjoern A. Zeeb 		if (e) {
22681d54aa3bSBjoern A. Zeeb 			char ip6buf[INET6_ADDRSTRLEN];
226933841545SHajimu UMEMOTO 			nd6log((LOG_DEBUG,
227033841545SHajimu UMEMOTO 			    "icmp6_reflect: source can't be determined: "
227133841545SHajimu UMEMOTO 			    "dst=%s, error=%d\n",
22721d54aa3bSBjoern A. Zeeb 			    ip6_sprintf(ip6buf, &sin6.sin6_addr), e));
227382cd038dSYoshinobu Inoue 			goto bad;
227433841545SHajimu UMEMOTO 		}
227588d166bfSBjoern A. Zeeb 		srcp = &src;
227633841545SHajimu UMEMOTO 	}
227782cd038dSYoshinobu Inoue 
227888d166bfSBjoern A. Zeeb 	ip6->ip6_src = *srcp;
227982cd038dSYoshinobu Inoue 	ip6->ip6_flow = 0;
2280686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2281686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc |= IPV6_VERSION;
228282cd038dSYoshinobu Inoue 	ip6->ip6_nxt = IPPROTO_ICMPV6;
2283f95d4633SHajimu UMEMOTO 	if (outif)
2284f95d4633SHajimu UMEMOTO 		ip6->ip6_hlim = ND_IFINFO(outif)->chlim;
2285f95d4633SHajimu UMEMOTO 	else if (m->m_pkthdr.rcvif) {
228682cd038dSYoshinobu Inoue 		/* XXX: This may not be the outgoing interface */
228731b1bfe1SHajimu UMEMOTO 		ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
228833841545SHajimu UMEMOTO 	} else
2289603724d3SBjoern A. Zeeb 		ip6->ip6_hlim = V_ip6_defhlim;
229082cd038dSYoshinobu Inoue 
229182cd038dSYoshinobu Inoue 	icmp6->icmp6_cksum = 0;
229282cd038dSYoshinobu Inoue 	icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
229382cd038dSYoshinobu Inoue 	    sizeof(struct ip6_hdr), plen);
229482cd038dSYoshinobu Inoue 
229582cd038dSYoshinobu Inoue 	/*
229633841545SHajimu UMEMOTO 	 * XXX option handling
229782cd038dSYoshinobu Inoue 	 */
229882cd038dSYoshinobu Inoue 
229982cd038dSYoshinobu Inoue 	m->m_flags &= ~(M_BCAST|M_MCAST);
230082cd038dSYoshinobu Inoue 
2301e0bfbfceSBjoern A. Zeeb 	m_addr_changed(m);
2302e0bfbfceSBjoern A. Zeeb 
23035d846453SSam Leffler 	ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
230482cd038dSYoshinobu Inoue 	if (outif)
230582cd038dSYoshinobu Inoue 		icmp6_ifoutstat_inc(outif, type, code);
230682cd038dSYoshinobu Inoue 
23078c0fec80SRobert Watson 	if (ia != NULL)
23088c0fec80SRobert Watson 		ifa_free(&ia->ia_ifa);
230982cd038dSYoshinobu Inoue 	return;
231082cd038dSYoshinobu Inoue 
231182cd038dSYoshinobu Inoue  bad:
23128c0fec80SRobert Watson 	if (ia != NULL)
23138c0fec80SRobert Watson 		ifa_free(&ia->ia_ifa);
231482cd038dSYoshinobu Inoue 	m_freem(m);
231582cd038dSYoshinobu Inoue 	return;
231682cd038dSYoshinobu Inoue }
231782cd038dSYoshinobu Inoue 
231882cd038dSYoshinobu Inoue void
23191272577eSXin LI icmp6_fasttimo(void)
232082cd038dSYoshinobu Inoue {
2321686cdd19SJun-ichiro itojun Hagino 
232233cde130SBruce M Simpson 	mld_fasttimo();
232333cde130SBruce M Simpson }
232433cde130SBruce M Simpson 
232533cde130SBruce M Simpson void
232633cde130SBruce M Simpson icmp6_slowtimo(void)
232733cde130SBruce M Simpson {
232833cde130SBruce M Simpson 
232933cde130SBruce M Simpson 	mld_slowtimo();
233082cd038dSYoshinobu Inoue }
233182cd038dSYoshinobu Inoue 
233282cd038dSYoshinobu Inoue static const char *
23331272577eSXin LI icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
23341272577eSXin LI     struct in6_addr *tgt6)
233582cd038dSYoshinobu Inoue {
233682cd038dSYoshinobu Inoue 	static char buf[1024];
23371d54aa3bSBjoern A. Zeeb 	char ip6bufs[INET6_ADDRSTRLEN];
23381d54aa3bSBjoern A. Zeeb 	char ip6bufd[INET6_ADDRSTRLEN];
23391d54aa3bSBjoern A. Zeeb 	char ip6buft[INET6_ADDRSTRLEN];
234082cd038dSYoshinobu Inoue 	snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
23411d54aa3bSBjoern A. Zeeb 	    ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
23421d54aa3bSBjoern A. Zeeb 	    ip6_sprintf(ip6buft, tgt6));
234382cd038dSYoshinobu Inoue 	return buf;
234482cd038dSYoshinobu Inoue }
234582cd038dSYoshinobu Inoue 
234682cd038dSYoshinobu Inoue void
23471272577eSXin LI icmp6_redirect_input(struct mbuf *m, int off)
234882cd038dSYoshinobu Inoue {
23492cb64cb2SGeorge V. Neville-Neil 	struct ifnet *ifp;
235082cd038dSYoshinobu Inoue 	struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2351686cdd19SJun-ichiro itojun Hagino 	struct nd_redirect *nd_rd;
235282cd038dSYoshinobu Inoue 	int icmp6len = ntohs(ip6->ip6_plen);
235382cd038dSYoshinobu Inoue 	char *lladdr = NULL;
235482cd038dSYoshinobu Inoue 	int lladdrlen = 0;
235582cd038dSYoshinobu Inoue 	struct rtentry *rt = NULL;
235682cd038dSYoshinobu Inoue 	int is_router;
235782cd038dSYoshinobu Inoue 	int is_onlink;
235882cd038dSYoshinobu Inoue 	struct in6_addr src6 = ip6->ip6_src;
2359686cdd19SJun-ichiro itojun Hagino 	struct in6_addr redtgt6;
2360686cdd19SJun-ichiro itojun Hagino 	struct in6_addr reddst6;
236182cd038dSYoshinobu Inoue 	union nd_opts ndopts;
23621d54aa3bSBjoern A. Zeeb 	char ip6buf[INET6_ADDRSTRLEN];
236382cd038dSYoshinobu Inoue 
236437c1ff48SGleb Smirnoff 	M_ASSERTPKTHDR(m);
236537c1ff48SGleb Smirnoff 	KASSERT(m->m_pkthdr.rcvif != NULL, ("%s: no rcvif", __func__));
23662cb64cb2SGeorge V. Neville-Neil 
23672cb64cb2SGeorge V. Neville-Neil 	ifp = m->m_pkthdr.rcvif;
23682cb64cb2SGeorge V. Neville-Neil 
236982cd038dSYoshinobu Inoue 	/* XXX if we are router, we don't update route by icmp6 redirect */
2370603724d3SBjoern A. Zeeb 	if (V_ip6_forwarding)
2371686cdd19SJun-ichiro itojun Hagino 		goto freeit;
2372603724d3SBjoern A. Zeeb 	if (!V_icmp6_rediraccept)
2373686cdd19SJun-ichiro itojun Hagino 		goto freeit;
2374686cdd19SJun-ichiro itojun Hagino 
2375686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
2376686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_CHECK(m, off, icmp6len,);
2377686cdd19SJun-ichiro itojun Hagino 	nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2378686cdd19SJun-ichiro itojun Hagino #else
2379686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2380686cdd19SJun-ichiro itojun Hagino 	if (nd_rd == NULL) {
2381e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
238282cd038dSYoshinobu Inoue 		return;
2383686cdd19SJun-ichiro itojun Hagino 	}
2384686cdd19SJun-ichiro itojun Hagino #endif
2385686cdd19SJun-ichiro itojun Hagino 	redtgt6 = nd_rd->nd_rd_target;
2386686cdd19SJun-ichiro itojun Hagino 	reddst6 = nd_rd->nd_rd_dst;
238782cd038dSYoshinobu Inoue 
2388a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
2389a1f7e5f8SHajimu UMEMOTO 	    in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
2390a1f7e5f8SHajimu UMEMOTO 		goto freeit;
2391a1f7e5f8SHajimu UMEMOTO 	}
239282cd038dSYoshinobu Inoue 
239382cd038dSYoshinobu Inoue 	/* validation */
239482cd038dSYoshinobu Inoue 	if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
239533841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
239682cd038dSYoshinobu Inoue 		    "ICMP6 redirect sent from %s rejected; "
239706cd0a3fSHajimu UMEMOTO 		    "must be from linklocal\n",
23981d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6buf, &src6)));
239933841545SHajimu UMEMOTO 		goto bad;
240082cd038dSYoshinobu Inoue 	}
240182cd038dSYoshinobu Inoue 	if (ip6->ip6_hlim != 255) {
240233841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
240382cd038dSYoshinobu Inoue 		    "ICMP6 redirect sent from %s rejected; "
240482cd038dSYoshinobu Inoue 		    "hlim=%d (must be 255)\n",
24051d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
240633841545SHajimu UMEMOTO 		goto bad;
240782cd038dSYoshinobu Inoue 	}
240882cd038dSYoshinobu Inoue     {
240982cd038dSYoshinobu Inoue 	/* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
241082cd038dSYoshinobu Inoue 	struct sockaddr_in6 sin6;
241182cd038dSYoshinobu Inoue 	struct in6_addr *gw6;
241282cd038dSYoshinobu Inoue 
241382cd038dSYoshinobu Inoue 	bzero(&sin6, sizeof(sin6));
241482cd038dSYoshinobu Inoue 	sin6.sin6_family = AF_INET6;
241582cd038dSYoshinobu Inoue 	sin6.sin6_len = sizeof(struct sockaddr_in6);
241682cd038dSYoshinobu Inoue 	bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
241782cd038dSYoshinobu Inoue 	rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
241882cd038dSYoshinobu Inoue 	if (rt) {
2419deebc913SHajimu UMEMOTO 		if (rt->rt_gateway == NULL ||
2420deebc913SHajimu UMEMOTO 		    rt->rt_gateway->sa_family != AF_INET6) {
242133841545SHajimu UMEMOTO 			nd6log((LOG_ERR,
2422deebc913SHajimu UMEMOTO 			    "ICMP6 redirect rejected; no route "
2423deebc913SHajimu UMEMOTO 			    "with inet6 gateway found for redirect dst: %s\n",
242433841545SHajimu UMEMOTO 			    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2425d1dd20beSSam Leffler 			RTFREE_LOCKED(rt);
242633841545SHajimu UMEMOTO 			goto bad;
2427deebc913SHajimu UMEMOTO 		}
2428deebc913SHajimu UMEMOTO 
242982cd038dSYoshinobu Inoue 		gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
243082cd038dSYoshinobu Inoue 		if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
243133841545SHajimu UMEMOTO 			nd6log((LOG_ERR,
243282cd038dSYoshinobu Inoue 			    "ICMP6 redirect rejected; "
243382cd038dSYoshinobu Inoue 			    "not equal to gw-for-src=%s (must be same): "
243482cd038dSYoshinobu Inoue 			    "%s\n",
24351d54aa3bSBjoern A. Zeeb 			    ip6_sprintf(ip6buf, gw6),
243633841545SHajimu UMEMOTO 			    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2437d1dd20beSSam Leffler 			RTFREE_LOCKED(rt);
243833841545SHajimu UMEMOTO 			goto bad;
243982cd038dSYoshinobu Inoue 		}
244082cd038dSYoshinobu Inoue 	} else {
244133841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
244282cd038dSYoshinobu Inoue 		    "ICMP6 redirect rejected; "
244382cd038dSYoshinobu Inoue 		    "no route found for redirect dst: %s\n",
244433841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
244533841545SHajimu UMEMOTO 		goto bad;
244682cd038dSYoshinobu Inoue 	}
2447d1dd20beSSam Leffler 	RTFREE_LOCKED(rt);
244882cd038dSYoshinobu Inoue 	rt = NULL;
244982cd038dSYoshinobu Inoue     }
245082cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
245133841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
245282cd038dSYoshinobu Inoue 		    "ICMP6 redirect rejected; "
245382cd038dSYoshinobu Inoue 		    "redirect dst must be unicast: %s\n",
245433841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
245533841545SHajimu UMEMOTO 		goto bad;
245682cd038dSYoshinobu Inoue 	}
245782cd038dSYoshinobu Inoue 
245882cd038dSYoshinobu Inoue 	is_router = is_onlink = 0;
245982cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
246082cd038dSYoshinobu Inoue 		is_router = 1;	/* router case */
246182cd038dSYoshinobu Inoue 	if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
246282cd038dSYoshinobu Inoue 		is_onlink = 1;	/* on-link destination case */
246382cd038dSYoshinobu Inoue 	if (!is_router && !is_onlink) {
246433841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
246582cd038dSYoshinobu Inoue 		    "ICMP6 redirect rejected; "
246682cd038dSYoshinobu Inoue 		    "neither router case nor onlink case: %s\n",
246733841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
246833841545SHajimu UMEMOTO 		goto bad;
246982cd038dSYoshinobu Inoue 	}
247082cd038dSYoshinobu Inoue 	/* validation passed */
247182cd038dSYoshinobu Inoue 
247282cd038dSYoshinobu Inoue 	icmp6len -= sizeof(*nd_rd);
247382cd038dSYoshinobu Inoue 	nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
247482cd038dSYoshinobu Inoue 	if (nd6_options(&ndopts) < 0) {
247537c1ff48SGleb Smirnoff 		nd6log((LOG_INFO, "%s: invalid ND option, rejected: %s\n",
247637c1ff48SGleb Smirnoff 		    __func__, icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
247733841545SHajimu UMEMOTO 		/* nd6_options have incremented stats */
2478686cdd19SJun-ichiro itojun Hagino 		goto freeit;
247982cd038dSYoshinobu Inoue 	}
248082cd038dSYoshinobu Inoue 
248182cd038dSYoshinobu Inoue 	if (ndopts.nd_opts_tgt_lladdr) {
248282cd038dSYoshinobu Inoue 		lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
248382cd038dSYoshinobu Inoue 		lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
248482cd038dSYoshinobu Inoue 	}
248582cd038dSYoshinobu Inoue 
248682cd038dSYoshinobu Inoue 	if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
248737c1ff48SGleb Smirnoff 		nd6log((LOG_INFO, "%s: lladdrlen mismatch for %s "
248882cd038dSYoshinobu Inoue 		    "(if %d, icmp6 packet %d): %s\n",
248937c1ff48SGleb Smirnoff 		    __func__, ip6_sprintf(ip6buf, &redtgt6),
24901d54aa3bSBjoern A. Zeeb 		    ifp->if_addrlen, lladdrlen - 2,
249133841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
249233841545SHajimu UMEMOTO 		goto bad;
249382cd038dSYoshinobu Inoue 	}
249482cd038dSYoshinobu Inoue 
249582cd038dSYoshinobu Inoue 	/* RFC 2461 8.3 */
249682cd038dSYoshinobu Inoue 	nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
249782cd038dSYoshinobu Inoue 	    is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
249882cd038dSYoshinobu Inoue 
249982cd038dSYoshinobu Inoue 	if (!is_onlink) {	/* better router case.  perform rtredirect. */
250082cd038dSYoshinobu Inoue 		/* perform rtredirect */
250182cd038dSYoshinobu Inoue 		struct sockaddr_in6 sdst;
250282cd038dSYoshinobu Inoue 		struct sockaddr_in6 sgw;
250382cd038dSYoshinobu Inoue 		struct sockaddr_in6 ssrc;
250482cd038dSYoshinobu Inoue 
250582cd038dSYoshinobu Inoue 		bzero(&sdst, sizeof(sdst));
250682cd038dSYoshinobu Inoue 		bzero(&sgw, sizeof(sgw));
250782cd038dSYoshinobu Inoue 		bzero(&ssrc, sizeof(ssrc));
250882cd038dSYoshinobu Inoue 		sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
250982cd038dSYoshinobu Inoue 		sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
251082cd038dSYoshinobu Inoue 			sizeof(struct sockaddr_in6);
251182cd038dSYoshinobu Inoue 		bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
251282cd038dSYoshinobu Inoue 		bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
251382cd038dSYoshinobu Inoue 		bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
251482cd038dSYoshinobu Inoue 		rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
251582cd038dSYoshinobu Inoue 		    (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
2516d1dd20beSSam Leffler 		    (struct sockaddr *)&ssrc);
251782cd038dSYoshinobu Inoue 	}
251882cd038dSYoshinobu Inoue 	/* finally update cached route in each socket via pfctlinput */
251982cd038dSYoshinobu Inoue     {
252082cd038dSYoshinobu Inoue 	struct sockaddr_in6 sdst;
252182cd038dSYoshinobu Inoue 
252282cd038dSYoshinobu Inoue 	bzero(&sdst, sizeof(sdst));
252382cd038dSYoshinobu Inoue 	sdst.sin6_family = AF_INET6;
252482cd038dSYoshinobu Inoue 	sdst.sin6_len = sizeof(struct sockaddr_in6);
252582cd038dSYoshinobu Inoue 	bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
252682cd038dSYoshinobu Inoue 	pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2527b2630c29SGeorge V. Neville-Neil #ifdef IPSEC
252882cd038dSYoshinobu Inoue 	key_sa_routechange((struct sockaddr *)&sdst);
2529b2630c29SGeorge V. Neville-Neil #endif /* IPSEC */
253082cd038dSYoshinobu Inoue     }
2531686cdd19SJun-ichiro itojun Hagino 
2532686cdd19SJun-ichiro itojun Hagino  freeit:
2533686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
253433841545SHajimu UMEMOTO 	return;
253533841545SHajimu UMEMOTO 
253633841545SHajimu UMEMOTO  bad:
2537e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_badredirect);
253833841545SHajimu UMEMOTO 	m_freem(m);
253982cd038dSYoshinobu Inoue }
254082cd038dSYoshinobu Inoue 
254182cd038dSYoshinobu Inoue void
25421272577eSXin LI icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
254382cd038dSYoshinobu Inoue {
254482cd038dSYoshinobu Inoue 	struct ifnet *ifp;	/* my outgoing interface */
254582cd038dSYoshinobu Inoue 	struct in6_addr *ifp_ll6;
254682cd038dSYoshinobu Inoue 	struct in6_addr *router_ll6;
254782cd038dSYoshinobu Inoue 	struct ip6_hdr *sip6;	/* m0 as struct ip6_hdr */
254882cd038dSYoshinobu Inoue 	struct mbuf *m = NULL;	/* newly allocated one */
25491db8d1f8SAna Kukec 	struct m_tag *mtag;
255082cd038dSYoshinobu Inoue 	struct ip6_hdr *ip6;	/* m as struct ip6_hdr */
255182cd038dSYoshinobu Inoue 	struct nd_redirect *nd_rd;
255256c423b0SKip Macy 	struct llentry *ln = NULL;
255382cd038dSYoshinobu Inoue 	size_t maxlen;
255482cd038dSYoshinobu Inoue 	u_char *p;
255582cd038dSYoshinobu Inoue 	struct ifnet *outif = NULL;
2556686cdd19SJun-ichiro itojun Hagino 	struct sockaddr_in6 src_sa;
2557686cdd19SJun-ichiro itojun Hagino 
2558603724d3SBjoern A. Zeeb 	icmp6_errcount(&V_icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
255982cd038dSYoshinobu Inoue 
256082cd038dSYoshinobu Inoue 	/* if we are not router, we don't send icmp6 redirect */
2561603724d3SBjoern A. Zeeb 	if (!V_ip6_forwarding)
256282cd038dSYoshinobu Inoue 		goto fail;
256382cd038dSYoshinobu Inoue 
256482cd038dSYoshinobu Inoue 	/* sanity check */
256582cd038dSYoshinobu Inoue 	if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
256682cd038dSYoshinobu Inoue 		goto fail;
256782cd038dSYoshinobu Inoue 
256882cd038dSYoshinobu Inoue 	/*
256982cd038dSYoshinobu Inoue 	 * Address check:
257082cd038dSYoshinobu Inoue 	 *  the source address must identify a neighbor, and
257182cd038dSYoshinobu Inoue 	 *  the destination address must not be a multicast address
257282cd038dSYoshinobu Inoue 	 *  [RFC 2461, sec 8.2]
257382cd038dSYoshinobu Inoue 	 */
257482cd038dSYoshinobu Inoue 	sip6 = mtod(m0, struct ip6_hdr *);
2575686cdd19SJun-ichiro itojun Hagino 	bzero(&src_sa, sizeof(src_sa));
2576686cdd19SJun-ichiro itojun Hagino 	src_sa.sin6_family = AF_INET6;
2577686cdd19SJun-ichiro itojun Hagino 	src_sa.sin6_len = sizeof(src_sa);
2578686cdd19SJun-ichiro itojun Hagino 	src_sa.sin6_addr = sip6->ip6_src;
2579686cdd19SJun-ichiro itojun Hagino 	if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
258082cd038dSYoshinobu Inoue 		goto fail;
258182cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
258282cd038dSYoshinobu Inoue 		goto fail;	/* what should we do here? */
258382cd038dSYoshinobu Inoue 
258482cd038dSYoshinobu Inoue 	/* rate limit */
258582cd038dSYoshinobu Inoue 	if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
258682cd038dSYoshinobu Inoue 		goto fail;
258782cd038dSYoshinobu Inoue 
258882cd038dSYoshinobu Inoue 	/*
258982cd038dSYoshinobu Inoue 	 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
259082cd038dSYoshinobu Inoue 	 * we almost always ask for an mbuf cluster for simplicity.
259182cd038dSYoshinobu Inoue 	 * (MHLEN < IPV6_MMTU is almost always true)
259282cd038dSYoshinobu Inoue 	 */
2593686cdd19SJun-ichiro itojun Hagino #if IPV6_MMTU >= MCLBYTES
2594686cdd19SJun-ichiro itojun Hagino # error assumption failed about IPV6_MMTU and MCLBYTES
2595686cdd19SJun-ichiro itojun Hagino #endif
2596a163d034SWarner Losh 	MGETHDR(m, M_DONTWAIT, MT_HEADER);
2597686cdd19SJun-ichiro itojun Hagino 	if (m && IPV6_MMTU >= MHLEN)
2598a163d034SWarner Losh 		MCLGET(m, M_DONTWAIT);
259982cd038dSYoshinobu Inoue 	if (!m)
260082cd038dSYoshinobu Inoue 		goto fail;
260133841545SHajimu UMEMOTO 	m->m_pkthdr.rcvif = NULL;
260233841545SHajimu UMEMOTO 	m->m_len = 0;
260333841545SHajimu UMEMOTO 	maxlen = M_TRAILINGSPACE(m);
260482cd038dSYoshinobu Inoue 	maxlen = min(IPV6_MMTU, maxlen);
260582cd038dSYoshinobu Inoue 	/* just for safety */
2606686cdd19SJun-ichiro itojun Hagino 	if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2607686cdd19SJun-ichiro itojun Hagino 	    ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
260882cd038dSYoshinobu Inoue 		goto fail;
2609686cdd19SJun-ichiro itojun Hagino 	}
261082cd038dSYoshinobu Inoue 
261182cd038dSYoshinobu Inoue 	{
261282cd038dSYoshinobu Inoue 		/* get ip6 linklocal address for ifp(my outgoing interface). */
2613686cdd19SJun-ichiro itojun Hagino 		struct in6_ifaddr *ia;
2614686cdd19SJun-ichiro itojun Hagino 		if ((ia = in6ifa_ifpforlinklocal(ifp,
2615686cdd19SJun-ichiro itojun Hagino 						 IN6_IFF_NOTREADY|
2616686cdd19SJun-ichiro itojun Hagino 						 IN6_IFF_ANYCAST)) == NULL)
261782cd038dSYoshinobu Inoue 			goto fail;
261882cd038dSYoshinobu Inoue 		ifp_ll6 = &ia->ia_addr.sin6_addr;
26198c0fec80SRobert Watson 		/* XXXRW: reference released prematurely. */
26208c0fec80SRobert Watson 		ifa_free(&ia->ia_ifa);
262182cd038dSYoshinobu Inoue 	}
262282cd038dSYoshinobu Inoue 
262382cd038dSYoshinobu Inoue 	/* get ip6 linklocal address for the router. */
262482cd038dSYoshinobu Inoue 	if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
262582cd038dSYoshinobu Inoue 		struct sockaddr_in6 *sin6;
262682cd038dSYoshinobu Inoue 		sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
262782cd038dSYoshinobu Inoue 		router_ll6 = &sin6->sin6_addr;
262882cd038dSYoshinobu Inoue 		if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
262982cd038dSYoshinobu Inoue 			router_ll6 = (struct in6_addr *)NULL;
263082cd038dSYoshinobu Inoue 	} else
263182cd038dSYoshinobu Inoue 		router_ll6 = (struct in6_addr *)NULL;
263282cd038dSYoshinobu Inoue 
263382cd038dSYoshinobu Inoue 	/* ip6 */
263482cd038dSYoshinobu Inoue 	ip6 = mtod(m, struct ip6_hdr *);
263582cd038dSYoshinobu Inoue 	ip6->ip6_flow = 0;
2636686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2637686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc |= IPV6_VERSION;
263882cd038dSYoshinobu Inoue 	/* ip6->ip6_plen will be set later */
263982cd038dSYoshinobu Inoue 	ip6->ip6_nxt = IPPROTO_ICMPV6;
264082cd038dSYoshinobu Inoue 	ip6->ip6_hlim = 255;
264182cd038dSYoshinobu Inoue 	/* ip6->ip6_src must be linklocal addr for my outgoing if. */
264282cd038dSYoshinobu Inoue 	bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
264382cd038dSYoshinobu Inoue 	bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
264482cd038dSYoshinobu Inoue 
264582cd038dSYoshinobu Inoue 	/* ND Redirect */
264682cd038dSYoshinobu Inoue 	nd_rd = (struct nd_redirect *)(ip6 + 1);
264782cd038dSYoshinobu Inoue 	nd_rd->nd_rd_type = ND_REDIRECT;
264882cd038dSYoshinobu Inoue 	nd_rd->nd_rd_code = 0;
264982cd038dSYoshinobu Inoue 	nd_rd->nd_rd_reserved = 0;
265082cd038dSYoshinobu Inoue 	if (rt->rt_flags & RTF_GATEWAY) {
265182cd038dSYoshinobu Inoue 		/*
265282cd038dSYoshinobu Inoue 		 * nd_rd->nd_rd_target must be a link-local address in
265382cd038dSYoshinobu Inoue 		 * better router cases.
265482cd038dSYoshinobu Inoue 		 */
265582cd038dSYoshinobu Inoue 		if (!router_ll6)
265682cd038dSYoshinobu Inoue 			goto fail;
265782cd038dSYoshinobu Inoue 		bcopy(router_ll6, &nd_rd->nd_rd_target,
265882cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_target));
265982cd038dSYoshinobu Inoue 		bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
266082cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_dst));
266182cd038dSYoshinobu Inoue 	} else {
266282cd038dSYoshinobu Inoue 		/* make sure redtgt == reddst */
266382cd038dSYoshinobu Inoue 		bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
266482cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_target));
266582cd038dSYoshinobu Inoue 		bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
266682cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_dst));
266782cd038dSYoshinobu Inoue 	}
266882cd038dSYoshinobu Inoue 
266982cd038dSYoshinobu Inoue 	p = (u_char *)(nd_rd + 1);
267082cd038dSYoshinobu Inoue 
267182cd038dSYoshinobu Inoue 	if (!router_ll6)
267282cd038dSYoshinobu Inoue 		goto nolladdropt;
267382cd038dSYoshinobu Inoue 
267482cd038dSYoshinobu Inoue 	{
267582cd038dSYoshinobu Inoue 		/* target lladdr option */
267682cd038dSYoshinobu Inoue 		int len;
267782cd038dSYoshinobu Inoue 		struct nd_opt_hdr *nd_opt;
267882cd038dSYoshinobu Inoue 		char *lladdr;
267982cd038dSYoshinobu Inoue 
26806e6b3f7cSQing Li 		IF_AFDATA_LOCK(ifp);
26816e6b3f7cSQing Li 		ln = nd6_lookup(router_ll6, 0, ifp);
26826e6b3f7cSQing Li 		IF_AFDATA_UNLOCK(ifp);
268356c423b0SKip Macy 		if (ln == NULL)
268482cd038dSYoshinobu Inoue 			goto nolladdropt;
26856e6b3f7cSQing Li 
2686686cdd19SJun-ichiro itojun Hagino 		len = sizeof(*nd_opt) + ifp->if_addrlen;
2687686cdd19SJun-ichiro itojun Hagino 		len = (len + 7) & ~7;	/* round by 8 */
2688686cdd19SJun-ichiro itojun Hagino 		/* safety check */
2689686cdd19SJun-ichiro itojun Hagino 		if (len + (p - (u_char *)ip6) > maxlen)
2690686cdd19SJun-ichiro itojun Hagino 			goto nolladdropt;
26916e6b3f7cSQing Li 
26926e6b3f7cSQing Li 		if (ln->la_flags & LLE_VALID) {
269382cd038dSYoshinobu Inoue 			nd_opt = (struct nd_opt_hdr *)p;
269482cd038dSYoshinobu Inoue 			nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
269582cd038dSYoshinobu Inoue 			nd_opt->nd_opt_len = len >> 3;
269682cd038dSYoshinobu Inoue 			lladdr = (char *)(nd_opt + 1);
26976e6b3f7cSQing Li 			bcopy(&ln->ll_addr, lladdr, ifp->if_addrlen);
2698686cdd19SJun-ichiro itojun Hagino 			p += len;
269982cd038dSYoshinobu Inoue 		}
270082cd038dSYoshinobu Inoue 	}
270156c423b0SKip Macy nolladdropt:
270256c423b0SKip Macy 	if (ln != NULL)
270356c423b0SKip Macy 		LLE_RUNLOCK(ln);
270482cd038dSYoshinobu Inoue 
270582cd038dSYoshinobu Inoue 	m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
270682cd038dSYoshinobu Inoue 
270782cd038dSYoshinobu Inoue 	/* just to be safe */
2708686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED	/*not openbsd*/
270982cd038dSYoshinobu Inoue 	if (m0->m_flags & M_DECRYPTED)
271082cd038dSYoshinobu Inoue 		goto noredhdropt;
2711686cdd19SJun-ichiro itojun Hagino #endif
2712686cdd19SJun-ichiro itojun Hagino 	if (p - (u_char *)ip6 > maxlen)
2713686cdd19SJun-ichiro itojun Hagino 		goto noredhdropt;
271482cd038dSYoshinobu Inoue 
271582cd038dSYoshinobu Inoue 	{
271682cd038dSYoshinobu Inoue 		/* redirected header option */
271782cd038dSYoshinobu Inoue 		int len;
271882cd038dSYoshinobu Inoue 		struct nd_opt_rd_hdr *nd_opt_rh;
271982cd038dSYoshinobu Inoue 
272082cd038dSYoshinobu Inoue 		/*
272182cd038dSYoshinobu Inoue 		 * compute the maximum size for icmp6 redirect header option.
272282cd038dSYoshinobu Inoue 		 * XXX room for auth header?
272382cd038dSYoshinobu Inoue 		 */
272482cd038dSYoshinobu Inoue 		len = maxlen - (p - (u_char *)ip6);
272582cd038dSYoshinobu Inoue 		len &= ~7;
272682cd038dSYoshinobu Inoue 
272782cd038dSYoshinobu Inoue 		/* This is just for simplicity. */
272882cd038dSYoshinobu Inoue 		if (m0->m_pkthdr.len != m0->m_len) {
272982cd038dSYoshinobu Inoue 			if (m0->m_next) {
273082cd038dSYoshinobu Inoue 				m_freem(m0->m_next);
273182cd038dSYoshinobu Inoue 				m0->m_next = NULL;
273282cd038dSYoshinobu Inoue 			}
273382cd038dSYoshinobu Inoue 			m0->m_pkthdr.len = m0->m_len;
273482cd038dSYoshinobu Inoue 		}
273582cd038dSYoshinobu Inoue 
273682cd038dSYoshinobu Inoue 		/*
273782cd038dSYoshinobu Inoue 		 * Redirected header option spec (RFC2461 4.6.3) talks nothing
273882cd038dSYoshinobu Inoue 		 * about padding/truncate rule for the original IP packet.
273906cd0a3fSHajimu UMEMOTO 		 * From the discussion on IPv6imp in Feb 1999,
274006cd0a3fSHajimu UMEMOTO 		 * the consensus was:
274182cd038dSYoshinobu Inoue 		 * - "attach as much as possible" is the goal
274206cd0a3fSHajimu UMEMOTO 		 * - pad if not aligned (original size can be guessed by
274306cd0a3fSHajimu UMEMOTO 		 *   original ip6 header)
274482cd038dSYoshinobu Inoue 		 * Following code adds the padding if it is simple enough,
274582cd038dSYoshinobu Inoue 		 * and truncates if not.
274682cd038dSYoshinobu Inoue 		 */
274782cd038dSYoshinobu Inoue 		if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
274806cd0a3fSHajimu UMEMOTO 			panic("assumption failed in %s:%d", __FILE__,
274906cd0a3fSHajimu UMEMOTO 			    __LINE__);
275082cd038dSYoshinobu Inoue 
275182cd038dSYoshinobu Inoue 		if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
275282cd038dSYoshinobu Inoue 			/* not enough room, truncate */
275306cd0a3fSHajimu UMEMOTO 			m0->m_pkthdr.len = m0->m_len = len -
275406cd0a3fSHajimu UMEMOTO 			    sizeof(*nd_opt_rh);
275582cd038dSYoshinobu Inoue 		} else {
275682cd038dSYoshinobu Inoue 			/* enough room, pad or truncate */
275782cd038dSYoshinobu Inoue 			size_t extra;
275882cd038dSYoshinobu Inoue 
275982cd038dSYoshinobu Inoue 			extra = m0->m_pkthdr.len % 8;
276082cd038dSYoshinobu Inoue 			if (extra) {
276182cd038dSYoshinobu Inoue 				/* pad if easy enough, truncate if not */
276282cd038dSYoshinobu Inoue 				if (8 - extra <= M_TRAILINGSPACE(m0)) {
276382cd038dSYoshinobu Inoue 					/* pad */
276482cd038dSYoshinobu Inoue 					m0->m_len += (8 - extra);
276582cd038dSYoshinobu Inoue 					m0->m_pkthdr.len += (8 - extra);
276682cd038dSYoshinobu Inoue 				} else {
276782cd038dSYoshinobu Inoue 					/* truncate */
276882cd038dSYoshinobu Inoue 					m0->m_pkthdr.len -= extra;
276982cd038dSYoshinobu Inoue 					m0->m_len -= extra;
277082cd038dSYoshinobu Inoue 				}
277182cd038dSYoshinobu Inoue 			}
277282cd038dSYoshinobu Inoue 			len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
277306cd0a3fSHajimu UMEMOTO 			m0->m_pkthdr.len = m0->m_len = len -
277406cd0a3fSHajimu UMEMOTO 			    sizeof(*nd_opt_rh);
277582cd038dSYoshinobu Inoue 		}
277682cd038dSYoshinobu Inoue 
277782cd038dSYoshinobu Inoue 		nd_opt_rh = (struct nd_opt_rd_hdr *)p;
277882cd038dSYoshinobu Inoue 		bzero(nd_opt_rh, sizeof(*nd_opt_rh));
277982cd038dSYoshinobu Inoue 		nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
278082cd038dSYoshinobu Inoue 		nd_opt_rh->nd_opt_rh_len = len >> 3;
278182cd038dSYoshinobu Inoue 		p += sizeof(*nd_opt_rh);
278282cd038dSYoshinobu Inoue 		m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
278382cd038dSYoshinobu Inoue 
278482cd038dSYoshinobu Inoue 		/* connect m0 to m */
2785db06e8a0SSUZUKI Shinsuke 		m_tag_delete_chain(m0, NULL);
2786db06e8a0SSUZUKI Shinsuke 		m0->m_flags &= ~M_PKTHDR;
278782cd038dSYoshinobu Inoue 		m->m_next = m0;
278882cd038dSYoshinobu Inoue 		m->m_pkthdr.len = m->m_len + m0->m_len;
2789db06e8a0SSUZUKI Shinsuke 		m0 = NULL;
279082cd038dSYoshinobu Inoue 	}
279182cd038dSYoshinobu Inoue noredhdropt:;
2792db06e8a0SSUZUKI Shinsuke 	if (m0) {
2793db06e8a0SSUZUKI Shinsuke 		m_freem(m0);
2794db06e8a0SSUZUKI Shinsuke 		m0 = NULL;
2795db06e8a0SSUZUKI Shinsuke 	}
279682cd038dSYoshinobu Inoue 
27979a4f9608SHajimu UMEMOTO 	/* XXX: clear embedded link IDs in the inner header */
27989a4f9608SHajimu UMEMOTO 	in6_clearscope(&sip6->ip6_src);
27999a4f9608SHajimu UMEMOTO 	in6_clearscope(&sip6->ip6_dst);
28009a4f9608SHajimu UMEMOTO 	in6_clearscope(&nd_rd->nd_rd_target);
28019a4f9608SHajimu UMEMOTO 	in6_clearscope(&nd_rd->nd_rd_dst);
280282cd038dSYoshinobu Inoue 
280382cd038dSYoshinobu Inoue 	ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
280482cd038dSYoshinobu Inoue 
280582cd038dSYoshinobu Inoue 	nd_rd->nd_rd_cksum = 0;
280606cd0a3fSHajimu UMEMOTO 	nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
280706cd0a3fSHajimu UMEMOTO 	    sizeof(*ip6), ntohs(ip6->ip6_plen));
280882cd038dSYoshinobu Inoue 
28091db8d1f8SAna Kukec         if (send_sendso_input_hook != NULL) {
28101db8d1f8SAna Kukec 		mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, sizeof(unsigned short),
28111db8d1f8SAna Kukec 			M_NOWAIT);
28121db8d1f8SAna Kukec 		if (mtag == NULL)
28131db8d1f8SAna Kukec 			goto fail;
28141db8d1f8SAna Kukec 		*(unsigned short *)(mtag + 1) = nd_rd->nd_rd_type;
28151db8d1f8SAna Kukec 		m_tag_prepend(m, mtag);
28161db8d1f8SAna Kukec 	}
28171db8d1f8SAna Kukec 
281882cd038dSYoshinobu Inoue 	/* send the packet to outside... */
28195d846453SSam Leffler 	ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
282082cd038dSYoshinobu Inoue 	if (outif) {
282182cd038dSYoshinobu Inoue 		icmp6_ifstat_inc(outif, ifs6_out_msg);
282282cd038dSYoshinobu Inoue 		icmp6_ifstat_inc(outif, ifs6_out_redirect);
282382cd038dSYoshinobu Inoue 	}
2824e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]);
282582cd038dSYoshinobu Inoue 
282682cd038dSYoshinobu Inoue 	return;
282782cd038dSYoshinobu Inoue 
282882cd038dSYoshinobu Inoue fail:
282982cd038dSYoshinobu Inoue 	if (m)
283082cd038dSYoshinobu Inoue 		m_freem(m);
283182cd038dSYoshinobu Inoue 	if (m0)
283282cd038dSYoshinobu Inoue 		m_freem(m0);
283382cd038dSYoshinobu Inoue }
283482cd038dSYoshinobu Inoue 
283582cd038dSYoshinobu Inoue /*
283682cd038dSYoshinobu Inoue  * ICMPv6 socket option processing.
283782cd038dSYoshinobu Inoue  */
283882cd038dSYoshinobu Inoue int
28391272577eSXin LI icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
284082cd038dSYoshinobu Inoue {
284182cd038dSYoshinobu Inoue 	int error = 0;
284282cd038dSYoshinobu Inoue 	int optlen;
284333841545SHajimu UMEMOTO 	struct inpcb *inp = sotoinpcb(so);
284482cd038dSYoshinobu Inoue 	int level, op, optname;
284582cd038dSYoshinobu Inoue 
284682cd038dSYoshinobu Inoue 	if (sopt) {
284782cd038dSYoshinobu Inoue 		level = sopt->sopt_level;
284882cd038dSYoshinobu Inoue 		op = sopt->sopt_dir;
284982cd038dSYoshinobu Inoue 		optname = sopt->sopt_name;
285082cd038dSYoshinobu Inoue 		optlen = sopt->sopt_valsize;
285182cd038dSYoshinobu Inoue 	} else
285282cd038dSYoshinobu Inoue 		level = op = optname = optlen = 0;
285333841545SHajimu UMEMOTO 
285482cd038dSYoshinobu Inoue 	if (level != IPPROTO_ICMPV6) {
285582cd038dSYoshinobu Inoue 		return EINVAL;
285682cd038dSYoshinobu Inoue 	}
285782cd038dSYoshinobu Inoue 
285882cd038dSYoshinobu Inoue 	switch (op) {
285982cd038dSYoshinobu Inoue 	case PRCO_SETOPT:
286082cd038dSYoshinobu Inoue 		switch (optname) {
286182cd038dSYoshinobu Inoue 		case ICMP6_FILTER:
286282cd038dSYoshinobu Inoue 		    {
2863ae89d5a3SRobert Watson 			struct icmp6_filter ic6f;
286482cd038dSYoshinobu Inoue 
2865ae89d5a3SRobert Watson 			if (optlen != sizeof(ic6f)) {
286682cd038dSYoshinobu Inoue 				error = EMSGSIZE;
286782cd038dSYoshinobu Inoue 				break;
286882cd038dSYoshinobu Inoue 			}
2869ae89d5a3SRobert Watson 			error = sooptcopyin(sopt, &ic6f, optlen, optlen);
2870ae89d5a3SRobert Watson 			if (error == 0) {
2871ae89d5a3SRobert Watson 				INP_WLOCK(inp);
2872ae89d5a3SRobert Watson 				*inp->in6p_icmp6filt = ic6f;
2873ae89d5a3SRobert Watson 				INP_WUNLOCK(inp);
2874ae89d5a3SRobert Watson 			}
287582cd038dSYoshinobu Inoue 			break;
287682cd038dSYoshinobu Inoue 		    }
287782cd038dSYoshinobu Inoue 
287882cd038dSYoshinobu Inoue 		default:
287982cd038dSYoshinobu Inoue 			error = ENOPROTOOPT;
288082cd038dSYoshinobu Inoue 			break;
288182cd038dSYoshinobu Inoue 		}
288282cd038dSYoshinobu Inoue 		break;
288382cd038dSYoshinobu Inoue 
288482cd038dSYoshinobu Inoue 	case PRCO_GETOPT:
288582cd038dSYoshinobu Inoue 		switch (optname) {
288682cd038dSYoshinobu Inoue 		case ICMP6_FILTER:
288782cd038dSYoshinobu Inoue 		    {
2888ae89d5a3SRobert Watson 			struct icmp6_filter ic6f;
2889ae89d5a3SRobert Watson 
2890ae89d5a3SRobert Watson 			INP_RLOCK(inp);
2891ae89d5a3SRobert Watson 			ic6f = *inp->in6p_icmp6filt;
2892ae89d5a3SRobert Watson 			INP_RUNLOCK(inp);
2893ae89d5a3SRobert Watson 			error = sooptcopyout(sopt, &ic6f, sizeof(ic6f));
289482cd038dSYoshinobu Inoue 			break;
289582cd038dSYoshinobu Inoue 		    }
289682cd038dSYoshinobu Inoue 
289782cd038dSYoshinobu Inoue 		default:
289882cd038dSYoshinobu Inoue 			error = ENOPROTOOPT;
289982cd038dSYoshinobu Inoue 			break;
290082cd038dSYoshinobu Inoue 		}
290182cd038dSYoshinobu Inoue 		break;
290282cd038dSYoshinobu Inoue 	}
290382cd038dSYoshinobu Inoue 
290482cd038dSYoshinobu Inoue 	return (error);
290582cd038dSYoshinobu Inoue }
290682cd038dSYoshinobu Inoue 
290782cd038dSYoshinobu Inoue /*
290882cd038dSYoshinobu Inoue  * Perform rate limit check.
290982cd038dSYoshinobu Inoue  * Returns 0 if it is okay to send the icmp6 packet.
291082cd038dSYoshinobu Inoue  * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
291182cd038dSYoshinobu Inoue  * limitation.
291282cd038dSYoshinobu Inoue  *
291382cd038dSYoshinobu Inoue  * XXX per-destination/type check necessary?
29141272577eSXin LI  *
29151272577eSXin LI  * dst - not used at this moment
29161272577eSXin LI  * type - not used at this moment
29171272577eSXin LI  * code - not used at this moment
291882cd038dSYoshinobu Inoue  */
291982cd038dSYoshinobu Inoue static int
29201272577eSXin LI icmp6_ratelimit(const struct in6_addr *dst, const int type,
29211272577eSXin LI     const int code)
292282cd038dSYoshinobu Inoue {
2923686cdd19SJun-ichiro itojun Hagino 	int ret;
292482cd038dSYoshinobu Inoue 
2925686cdd19SJun-ichiro itojun Hagino 	ret = 0;	/* okay to send */
292682cd038dSYoshinobu Inoue 
2927686cdd19SJun-ichiro itojun Hagino 	/* PPS limit */
2928603724d3SBjoern A. Zeeb 	if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count,
2929603724d3SBjoern A. Zeeb 	    V_icmp6errppslim)) {
293082cd038dSYoshinobu Inoue 		/* The packet is subject to rate limit */
2931686cdd19SJun-ichiro itojun Hagino 		ret++;
293282cd038dSYoshinobu Inoue 	}
293382cd038dSYoshinobu Inoue 
2934686cdd19SJun-ichiro itojun Hagino 	return ret;
293582cd038dSYoshinobu Inoue }
2936