xref: /freebsd/sys/netinet6/icmp6.c (revision 8c0fec805f76bef04e007ca08552bd80ab64daf9)
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>
7782cd038dSYoshinobu Inoue #include <sys/protosw.h>
78960ed29cSSeigo Tanimura #include <sys/signalvar.h>
7982cd038dSYoshinobu Inoue #include <sys/socket.h>
8082cd038dSYoshinobu Inoue #include <sys/socketvar.h>
81960ed29cSSeigo Tanimura #include <sys/sx.h>
8282cd038dSYoshinobu Inoue #include <sys/syslog.h>
83960ed29cSSeigo Tanimura #include <sys/systm.h>
84960ed29cSSeigo Tanimura #include <sys/time.h>
85603724d3SBjoern A. Zeeb #include <sys/vimage.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 #include <netinet/vinet.h>
1014b79449eSBjoern A. Zeeb 
10282cd038dSYoshinobu Inoue #include <netinet6/in6_ifattach.h>
103960ed29cSSeigo Tanimura #include <netinet6/in6_pcb.h>
10482cd038dSYoshinobu Inoue #include <netinet6/ip6protosw.h>
105960ed29cSSeigo Tanimura #include <netinet6/ip6_var.h>
106a1f7e5f8SHajimu UMEMOTO #include <netinet6/scope6_var.h>
107960ed29cSSeigo Tanimura #include <netinet6/mld6_var.h>
108960ed29cSSeigo Tanimura #include <netinet6/nd6.h>
1094b79449eSBjoern A. Zeeb #include <netinet6/vinet6.h>
11082cd038dSYoshinobu Inoue 
111b2630c29SGeorge V. Neville-Neil #ifdef IPSEC
112b9234fafSSam Leffler #include <netipsec/ipsec.h>
113b9234fafSSam Leffler #include <netipsec/key.h>
114b9234fafSSam Leffler #endif
115b9234fafSSam Leffler 
11682cd038dSYoshinobu Inoue extern struct domain inet6domain;
11797021c24SMarko Zec 
11897021c24SMarko Zec #ifdef VIMAGE_GLOBALS
119da2ecc1aSRobert Watson extern struct inpcbinfo ripcbinfo;
12082cd038dSYoshinobu Inoue extern struct inpcbhead ripcb;
121686cdd19SJun-ichiro itojun Hagino extern int icmp6errppslim;
122686cdd19SJun-ichiro itojun Hagino extern int icmp6_nodeinfo;
12382cd038dSYoshinobu Inoue 
12444e33a07SMarko Zec struct icmp6stat icmp6stat;
12544e33a07SMarko Zec static int icmp6errpps_count;
12644e33a07SMarko Zec static struct timeval icmp6errppslim_last;
12744e33a07SMarko Zec #endif
12844e33a07SMarko Zec 
1299233d8f3SDavid E. O'Brien static void icmp6_errcount(struct icmp6errstat *, int, int);
1309233d8f3SDavid E. O'Brien static int icmp6_rip6_input(struct mbuf **, int);
1319233d8f3SDavid E. O'Brien static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
13282cd038dSYoshinobu Inoue static const char *icmp6_redirect_diag __P((struct in6_addr *,
133686cdd19SJun-ichiro itojun Hagino 	struct in6_addr *, struct in6_addr *));
1349233d8f3SDavid E. O'Brien static struct mbuf *ni6_input(struct mbuf *, int);
1359233d8f3SDavid E. O'Brien static struct mbuf *ni6_nametodns(const char *, int, int);
1369233d8f3SDavid E. O'Brien static int ni6_dnsmatch(const char *, int, const char *, int);
13782cd038dSYoshinobu Inoue static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
138c66b5feaSHajimu UMEMOTO 			  struct ifnet **, struct in6_addr *));
139686cdd19SJun-ichiro itojun Hagino static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
14082cd038dSYoshinobu Inoue 				struct ifnet *, int));
1419233d8f3SDavid E. O'Brien static int icmp6_notify_error(struct mbuf **, int, int, int);
14282cd038dSYoshinobu Inoue 
14333841545SHajimu UMEMOTO 
14482cd038dSYoshinobu Inoue void
1451272577eSXin LI icmp6_init(void)
14682cd038dSYoshinobu Inoue {
1478b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
1481272577eSXin LI 
14944e33a07SMarko Zec 	V_icmp6errpps_count = 0;
15082cd038dSYoshinobu Inoue }
15182cd038dSYoshinobu Inoue 
152686cdd19SJun-ichiro itojun Hagino static void
1531272577eSXin LI icmp6_errcount(struct icmp6errstat *stat, int type, int code)
154686cdd19SJun-ichiro itojun Hagino {
155686cdd19SJun-ichiro itojun Hagino 	switch (type) {
156686cdd19SJun-ichiro itojun Hagino 	case ICMP6_DST_UNREACH:
157686cdd19SJun-ichiro itojun Hagino 		switch (code) {
158686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_NOROUTE:
159686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_dst_unreach_noroute++;
160686cdd19SJun-ichiro itojun Hagino 			return;
161686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_ADMIN:
162686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_dst_unreach_admin++;
163686cdd19SJun-ichiro itojun Hagino 			return;
164686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_BEYONDSCOPE:
165686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_dst_unreach_beyondscope++;
166686cdd19SJun-ichiro itojun Hagino 			return;
167686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_ADDR:
168686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_dst_unreach_addr++;
169686cdd19SJun-ichiro itojun Hagino 			return;
170686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_NOPORT:
171686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_dst_unreach_noport++;
172686cdd19SJun-ichiro itojun Hagino 			return;
173686cdd19SJun-ichiro itojun Hagino 		}
174686cdd19SJun-ichiro itojun Hagino 		break;
175686cdd19SJun-ichiro itojun Hagino 	case ICMP6_PACKET_TOO_BIG:
176686cdd19SJun-ichiro itojun Hagino 		stat->icp6errs_packet_too_big++;
177686cdd19SJun-ichiro itojun Hagino 		return;
178686cdd19SJun-ichiro itojun Hagino 	case ICMP6_TIME_EXCEEDED:
179686cdd19SJun-ichiro itojun Hagino 		switch (code) {
180686cdd19SJun-ichiro itojun Hagino 		case ICMP6_TIME_EXCEED_TRANSIT:
181686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_time_exceed_transit++;
182686cdd19SJun-ichiro itojun Hagino 			return;
183686cdd19SJun-ichiro itojun Hagino 		case ICMP6_TIME_EXCEED_REASSEMBLY:
184686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_time_exceed_reassembly++;
185686cdd19SJun-ichiro itojun Hagino 			return;
186686cdd19SJun-ichiro itojun Hagino 		}
187686cdd19SJun-ichiro itojun Hagino 		break;
188686cdd19SJun-ichiro itojun Hagino 	case ICMP6_PARAM_PROB:
189686cdd19SJun-ichiro itojun Hagino 		switch (code) {
190686cdd19SJun-ichiro itojun Hagino 		case ICMP6_PARAMPROB_HEADER:
191686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_paramprob_header++;
192686cdd19SJun-ichiro itojun Hagino 			return;
193686cdd19SJun-ichiro itojun Hagino 		case ICMP6_PARAMPROB_NEXTHEADER:
194686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_paramprob_nextheader++;
195686cdd19SJun-ichiro itojun Hagino 			return;
196686cdd19SJun-ichiro itojun Hagino 		case ICMP6_PARAMPROB_OPTION:
197686cdd19SJun-ichiro itojun Hagino 			stat->icp6errs_paramprob_option++;
198686cdd19SJun-ichiro itojun Hagino 			return;
199686cdd19SJun-ichiro itojun Hagino 		}
200686cdd19SJun-ichiro itojun Hagino 		break;
201686cdd19SJun-ichiro itojun Hagino 	case ND_REDIRECT:
202686cdd19SJun-ichiro itojun Hagino 		stat->icp6errs_redirect++;
203686cdd19SJun-ichiro itojun Hagino 		return;
204686cdd19SJun-ichiro itojun Hagino 	}
205686cdd19SJun-ichiro itojun Hagino 	stat->icp6errs_unknown++;
206686cdd19SJun-ichiro itojun Hagino }
207686cdd19SJun-ichiro itojun Hagino 
20882cd038dSYoshinobu Inoue /*
209a1f7e5f8SHajimu UMEMOTO  * A wrapper function for icmp6_error() necessary when the erroneous packet
210a1f7e5f8SHajimu UMEMOTO  * may not contain enough scope zone information.
211a1f7e5f8SHajimu UMEMOTO  */
212a1f7e5f8SHajimu UMEMOTO void
2131272577eSXin LI icmp6_error2(struct mbuf *m, int type, int code, int param,
2141272577eSXin LI     struct ifnet *ifp)
215a1f7e5f8SHajimu UMEMOTO {
2168b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
217a1f7e5f8SHajimu UMEMOTO 	struct ip6_hdr *ip6;
218a1f7e5f8SHajimu UMEMOTO 
219a1f7e5f8SHajimu UMEMOTO 	if (ifp == NULL)
220a1f7e5f8SHajimu UMEMOTO 		return;
221a1f7e5f8SHajimu UMEMOTO 
222a1f7e5f8SHajimu UMEMOTO #ifndef PULLDOWN_TEST
223a1f7e5f8SHajimu UMEMOTO 	IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
224a1f7e5f8SHajimu UMEMOTO #else
225a1f7e5f8SHajimu UMEMOTO 	if (m->m_len < sizeof(struct ip6_hdr)) {
226a1f7e5f8SHajimu UMEMOTO 		m = m_pullup(m, sizeof(struct ip6_hdr));
227a1f7e5f8SHajimu UMEMOTO 		if (m == NULL)
228a1f7e5f8SHajimu UMEMOTO 			return;
229a1f7e5f8SHajimu UMEMOTO 	}
230a1f7e5f8SHajimu UMEMOTO #endif
231a1f7e5f8SHajimu UMEMOTO 
232a1f7e5f8SHajimu UMEMOTO 	ip6 = mtod(m, struct ip6_hdr *);
233a1f7e5f8SHajimu UMEMOTO 
234a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
235a1f7e5f8SHajimu UMEMOTO 		return;
236a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
237a1f7e5f8SHajimu UMEMOTO 		return;
238a1f7e5f8SHajimu UMEMOTO 
239a1f7e5f8SHajimu UMEMOTO 	icmp6_error(m, type, code, param);
240a1f7e5f8SHajimu UMEMOTO }
241a1f7e5f8SHajimu UMEMOTO 
242a1f7e5f8SHajimu UMEMOTO /*
24382cd038dSYoshinobu Inoue  * Generate an error packet of type error in response to bad IP6 packet.
24482cd038dSYoshinobu Inoue  */
24582cd038dSYoshinobu Inoue void
2461272577eSXin LI icmp6_error(struct mbuf *m, int type, int code, int param)
24782cd038dSYoshinobu Inoue {
2488b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
24982cd038dSYoshinobu Inoue 	struct ip6_hdr *oip6, *nip6;
25082cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6;
251686cdd19SJun-ichiro itojun Hagino 	u_int preplen;
25282cd038dSYoshinobu Inoue 	int off;
253686cdd19SJun-ichiro itojun Hagino 	int nxt;
25482cd038dSYoshinobu Inoue 
255e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_error);
25682cd038dSYoshinobu Inoue 
257686cdd19SJun-ichiro itojun Hagino 	/* count per-type-code statistics */
258603724d3SBjoern A. Zeeb 	icmp6_errcount(&V_icmp6stat.icp6s_outerrhist, type, code);
25982cd038dSYoshinobu Inoue 
260686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED	/*not openbsd*/
261686cdd19SJun-ichiro itojun Hagino 	if (m->m_flags & M_DECRYPTED) {
262e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_canterror);
263686cdd19SJun-ichiro itojun Hagino 		goto freeit;
264686cdd19SJun-ichiro itojun Hagino 	}
265686cdd19SJun-ichiro itojun Hagino #endif
266686cdd19SJun-ichiro itojun Hagino 
267686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
268686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
269686cdd19SJun-ichiro itojun Hagino #else
270686cdd19SJun-ichiro itojun Hagino 	if (m->m_len < sizeof(struct ip6_hdr)) {
271686cdd19SJun-ichiro itojun Hagino 		m = m_pullup(m, sizeof(struct ip6_hdr));
272686cdd19SJun-ichiro itojun Hagino 		if (m == NULL)
273686cdd19SJun-ichiro itojun Hagino 			return;
274686cdd19SJun-ichiro itojun Hagino 	}
275686cdd19SJun-ichiro itojun Hagino #endif
27682cd038dSYoshinobu Inoue 	oip6 = mtod(m, struct ip6_hdr *);
27782cd038dSYoshinobu Inoue 
27882cd038dSYoshinobu Inoue 	/*
279f95d4633SHajimu UMEMOTO 	 * If the destination address of the erroneous packet is a multicast
280f95d4633SHajimu UMEMOTO 	 * address, or the packet was sent using link-layer multicast,
281f95d4633SHajimu UMEMOTO 	 * we should basically suppress sending an error (RFC 2463, Section
282f95d4633SHajimu UMEMOTO 	 * 2.4).
283f95d4633SHajimu UMEMOTO 	 * We have two exceptions (the item e.2 in that section):
284f95d4633SHajimu UMEMOTO 	 * - the Pakcet Too Big message can be sent for path MTU discovery.
285f95d4633SHajimu UMEMOTO 	 * - the Parameter Problem Message that can be allowed an icmp6 error
286f95d4633SHajimu UMEMOTO 	 *   in the option type field.  This check has been done in
287f95d4633SHajimu UMEMOTO 	 *   ip6_unknown_opt(), so we can just check the type and code.
28882cd038dSYoshinobu Inoue 	 */
28982cd038dSYoshinobu Inoue 	if ((m->m_flags & (M_BCAST|M_MCAST) ||
29082cd038dSYoshinobu Inoue 	     IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
29182cd038dSYoshinobu Inoue 	    (type != ICMP6_PACKET_TOO_BIG &&
29282cd038dSYoshinobu Inoue 	     (type != ICMP6_PARAM_PROB ||
29382cd038dSYoshinobu Inoue 	      code != ICMP6_PARAMPROB_OPTION)))
29482cd038dSYoshinobu Inoue 		goto freeit;
29582cd038dSYoshinobu Inoue 
296f95d4633SHajimu UMEMOTO 	/*
297f95d4633SHajimu UMEMOTO 	 * RFC 2463, 2.4 (e.5): source address check.
298f95d4633SHajimu UMEMOTO 	 * XXX: the case of anycast source?
299f95d4633SHajimu UMEMOTO 	 */
30082cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
30182cd038dSYoshinobu Inoue 	    IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
30282cd038dSYoshinobu Inoue 		goto freeit;
30382cd038dSYoshinobu Inoue 
30482cd038dSYoshinobu Inoue 	/*
305686cdd19SJun-ichiro itojun Hagino 	 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
306686cdd19SJun-ichiro itojun Hagino 	 * don't do it.
30782cd038dSYoshinobu Inoue 	 */
308686cdd19SJun-ichiro itojun Hagino 	nxt = -1;
309686cdd19SJun-ichiro itojun Hagino 	off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
310686cdd19SJun-ichiro itojun Hagino 	if (off >= 0 && nxt == IPPROTO_ICMPV6) {
31182cd038dSYoshinobu Inoue 		struct icmp6_hdr *icp;
31282cd038dSYoshinobu Inoue 
313686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
31482cd038dSYoshinobu Inoue 		IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
31582cd038dSYoshinobu Inoue 		icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
316686cdd19SJun-ichiro itojun Hagino #else
317686cdd19SJun-ichiro itojun Hagino 		IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
318686cdd19SJun-ichiro itojun Hagino 			sizeof(*icp));
319686cdd19SJun-ichiro itojun Hagino 		if (icp == NULL) {
320e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_tooshort);
321686cdd19SJun-ichiro itojun Hagino 			return;
322686cdd19SJun-ichiro itojun Hagino 		}
323686cdd19SJun-ichiro itojun Hagino #endif
324686cdd19SJun-ichiro itojun Hagino 		if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
325686cdd19SJun-ichiro itojun Hagino 		    icp->icmp6_type == ND_REDIRECT) {
32682cd038dSYoshinobu Inoue 			/*
32782cd038dSYoshinobu Inoue 			 * ICMPv6 error
32882cd038dSYoshinobu Inoue 			 * Special case: for redirect (which is
32982cd038dSYoshinobu Inoue 			 * informational) we must not send icmp6 error.
33082cd038dSYoshinobu Inoue 			 */
331e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_canterror);
33282cd038dSYoshinobu Inoue 			goto freeit;
33382cd038dSYoshinobu Inoue 		} else {
334686cdd19SJun-ichiro itojun Hagino 			/* ICMPv6 informational - send the error */
33582cd038dSYoshinobu Inoue 		}
336686cdd19SJun-ichiro itojun Hagino 	} else {
337686cdd19SJun-ichiro itojun Hagino 		/* non-ICMPv6 - send the error */
33882cd038dSYoshinobu Inoue 	}
33982cd038dSYoshinobu Inoue 
34082cd038dSYoshinobu Inoue 	oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
34182cd038dSYoshinobu Inoue 
34282cd038dSYoshinobu Inoue 	/* Finally, do rate limitation check. */
34382cd038dSYoshinobu Inoue 	if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
344e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_toofreq);
34582cd038dSYoshinobu Inoue 		goto freeit;
34682cd038dSYoshinobu Inoue 	}
34782cd038dSYoshinobu Inoue 
34882cd038dSYoshinobu Inoue 	/*
34982cd038dSYoshinobu Inoue 	 * OK, ICMP6 can be generated.
35082cd038dSYoshinobu Inoue 	 */
35182cd038dSYoshinobu Inoue 
35282cd038dSYoshinobu Inoue 	if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
35382cd038dSYoshinobu Inoue 		m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
35482cd038dSYoshinobu Inoue 
355686cdd19SJun-ichiro itojun Hagino 	preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
356a163d034SWarner Losh 	M_PREPEND(m, preplen, M_DONTWAIT);
357686cdd19SJun-ichiro itojun Hagino 	if (m && m->m_len < preplen)
358686cdd19SJun-ichiro itojun Hagino 		m = m_pullup(m, preplen);
35982cd038dSYoshinobu Inoue 	if (m == NULL) {
36033841545SHajimu UMEMOTO 		nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
36182cd038dSYoshinobu Inoue 		return;
36282cd038dSYoshinobu Inoue 	}
36382cd038dSYoshinobu Inoue 
36482cd038dSYoshinobu Inoue 	nip6 = mtod(m, struct ip6_hdr *);
36582cd038dSYoshinobu Inoue 	nip6->ip6_src  = oip6->ip6_src;
36682cd038dSYoshinobu Inoue 	nip6->ip6_dst  = oip6->ip6_dst;
36782cd038dSYoshinobu Inoue 
3689a4f9608SHajimu UMEMOTO 	in6_clearscope(&oip6->ip6_src);
3699a4f9608SHajimu UMEMOTO 	in6_clearscope(&oip6->ip6_dst);
37082cd038dSYoshinobu Inoue 
37182cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)(nip6 + 1);
37282cd038dSYoshinobu Inoue 	icmp6->icmp6_type = type;
37382cd038dSYoshinobu Inoue 	icmp6->icmp6_code = code;
37482cd038dSYoshinobu Inoue 	icmp6->icmp6_pptr = htonl((u_int32_t)param);
37582cd038dSYoshinobu Inoue 
37633841545SHajimu UMEMOTO 	/*
37733841545SHajimu UMEMOTO 	 * icmp6_reflect() is designed to be in the input path.
378cd0fdcf7SHajimu UMEMOTO 	 * icmp6_error() can be called from both input and output path,
37933841545SHajimu UMEMOTO 	 * and if we are in output path rcvif could contain bogus value.
38033841545SHajimu UMEMOTO 	 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
38133841545SHajimu UMEMOTO 	 * information in ip header (nip6).
38233841545SHajimu UMEMOTO 	 */
38333841545SHajimu UMEMOTO 	m->m_pkthdr.rcvif = NULL;
38433841545SHajimu UMEMOTO 
385e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_outhist[type]);
38682cd038dSYoshinobu Inoue 	icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
387686cdd19SJun-ichiro itojun Hagino 
388686cdd19SJun-ichiro itojun Hagino 	return;
389686cdd19SJun-ichiro itojun Hagino 
390686cdd19SJun-ichiro itojun Hagino   freeit:
391686cdd19SJun-ichiro itojun Hagino 	/*
392cd0fdcf7SHajimu UMEMOTO 	 * If we can't tell whether or not we can generate ICMP6, free it.
393686cdd19SJun-ichiro itojun Hagino 	 */
394686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
39582cd038dSYoshinobu Inoue }
39682cd038dSYoshinobu Inoue 
39782cd038dSYoshinobu Inoue /*
39882cd038dSYoshinobu Inoue  * Process a received ICMP6 message.
39982cd038dSYoshinobu Inoue  */
40082cd038dSYoshinobu Inoue int
4011272577eSXin LI icmp6_input(struct mbuf **mp, int *offp, int proto)
40282cd038dSYoshinobu Inoue {
4038b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
40482cd038dSYoshinobu Inoue 	struct mbuf *m = *mp, *n;
40529dc7bc6SBruce M Simpson 	struct ifnet *ifp;
40682cd038dSYoshinobu Inoue 	struct ip6_hdr *ip6, *nip6;
40782cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6, *nicmp6;
40882cd038dSYoshinobu Inoue 	int off = *offp;
40982cd038dSYoshinobu Inoue 	int icmp6len = m->m_pkthdr.len - *offp;
41082cd038dSYoshinobu Inoue 	int code, sum, noff;
4111d54aa3bSBjoern A. Zeeb 	char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
41282cd038dSYoshinobu Inoue 
41329dc7bc6SBruce M Simpson 	ifp = m->m_pkthdr.rcvif;
41429dc7bc6SBruce M Simpson 
415686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
41682cd038dSYoshinobu Inoue 	IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
41782cd038dSYoshinobu Inoue 	/* m might change if M_LOOP.  So, call mtod after this */
418686cdd19SJun-ichiro itojun Hagino #endif
41982cd038dSYoshinobu Inoue 
42082cd038dSYoshinobu Inoue 	/*
42182cd038dSYoshinobu Inoue 	 * Locate icmp6 structure in mbuf, and check
42282cd038dSYoshinobu Inoue 	 * that not corrupted and of at least minimum length
42382cd038dSYoshinobu Inoue 	 */
42482cd038dSYoshinobu Inoue 
42582cd038dSYoshinobu Inoue 	ip6 = mtod(m, struct ip6_hdr *);
42682cd038dSYoshinobu Inoue 	if (icmp6len < sizeof(struct icmp6_hdr)) {
427e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
42882cd038dSYoshinobu Inoue 		goto freeit;
42982cd038dSYoshinobu Inoue 	}
43082cd038dSYoshinobu Inoue 
43182cd038dSYoshinobu Inoue 	/*
43233cde130SBruce M Simpson 	 * Check multicast group membership.
43333cde130SBruce M Simpson 	 * Note: SSM filters are not applied for ICMPv6 traffic.
43433cde130SBruce M Simpson 	 */
43533cde130SBruce M Simpson 	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
43633cde130SBruce M Simpson 		struct in6_multi	*inm;
43733cde130SBruce M Simpson 
43833cde130SBruce M Simpson 		inm = in6m_lookup(ifp, &ip6->ip6_dst);
43933cde130SBruce M Simpson 		if (inm == NULL) {
44033cde130SBruce M Simpson 			IP6STAT_INC(ip6s_notmember);
44133cde130SBruce M Simpson 			in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
44233cde130SBruce M Simpson 			goto freeit;
44333cde130SBruce M Simpson 		}
44433cde130SBruce M Simpson 	}
44533cde130SBruce M Simpson 
44633cde130SBruce M Simpson 	/*
44782cd038dSYoshinobu Inoue 	 * calculate the checksum
44882cd038dSYoshinobu Inoue 	 */
449686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
45082cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
451686cdd19SJun-ichiro itojun Hagino #else
452686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
453686cdd19SJun-ichiro itojun Hagino 	if (icmp6 == NULL) {
454e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
455686cdd19SJun-ichiro itojun Hagino 		return IPPROTO_DONE;
456686cdd19SJun-ichiro itojun Hagino 	}
457686cdd19SJun-ichiro itojun Hagino #endif
45882cd038dSYoshinobu Inoue 	code = icmp6->icmp6_code;
45982cd038dSYoshinobu Inoue 
46082cd038dSYoshinobu Inoue 	if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
46133841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
46282cd038dSYoshinobu Inoue 		    "ICMP6 checksum error(%d|%x) %s\n",
4631d54aa3bSBjoern A. Zeeb 		    icmp6->icmp6_type, sum,
4641d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6bufs, &ip6->ip6_src)));
465e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_checksum);
46682cd038dSYoshinobu Inoue 		goto freeit;
46782cd038dSYoshinobu Inoue 	}
46882cd038dSYoshinobu Inoue 
4699494d596SBrooks Davis 	if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
47082cd038dSYoshinobu Inoue 		/*
47182cd038dSYoshinobu Inoue 		 * Deliver very specific ICMP6 type only.
472cd0fdcf7SHajimu UMEMOTO 		 * This is important to deliver TOOBIG.  Otherwise PMTUD
47382cd038dSYoshinobu Inoue 		 * will not work.
47482cd038dSYoshinobu Inoue 		 */
47582cd038dSYoshinobu Inoue 		switch (icmp6->icmp6_type) {
47682cd038dSYoshinobu Inoue 		case ICMP6_DST_UNREACH:
47782cd038dSYoshinobu Inoue 		case ICMP6_PACKET_TOO_BIG:
47882cd038dSYoshinobu Inoue 		case ICMP6_TIME_EXCEEDED:
47982cd038dSYoshinobu Inoue 			break;
48082cd038dSYoshinobu Inoue 		default:
48182cd038dSYoshinobu Inoue 			goto freeit;
48282cd038dSYoshinobu Inoue 		}
48382cd038dSYoshinobu Inoue 	}
48482cd038dSYoshinobu Inoue 
485e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]);
48629dc7bc6SBruce M Simpson 	icmp6_ifstat_inc(ifp, ifs6_in_msg);
48782cd038dSYoshinobu Inoue 	if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
48829dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_error);
48982cd038dSYoshinobu Inoue 
49082cd038dSYoshinobu Inoue 	switch (icmp6->icmp6_type) {
49182cd038dSYoshinobu Inoue 	case ICMP6_DST_UNREACH:
49229dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_dstunreach);
49382cd038dSYoshinobu Inoue 		switch (code) {
49482cd038dSYoshinobu Inoue 		case ICMP6_DST_UNREACH_NOROUTE:
49582cd038dSYoshinobu Inoue 			code = PRC_UNREACH_NET;
49682cd038dSYoshinobu Inoue 			break;
49782cd038dSYoshinobu Inoue 		case ICMP6_DST_UNREACH_ADMIN:
49829dc7bc6SBruce M Simpson 			icmp6_ifstat_inc(ifp, ifs6_in_adminprohib);
499686cdd19SJun-ichiro itojun Hagino 			code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
50082cd038dSYoshinobu Inoue 			break;
501686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_ADDR:
502686cdd19SJun-ichiro itojun Hagino 			code = PRC_HOSTDEAD;
503686cdd19SJun-ichiro itojun Hagino 			break;
504686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_BEYONDSCOPE:
505686cdd19SJun-ichiro itojun Hagino 			/* I mean "source address was incorrect." */
506686cdd19SJun-ichiro itojun Hagino 			code = PRC_PARAMPROB;
507686cdd19SJun-ichiro itojun Hagino 			break;
50882cd038dSYoshinobu Inoue 		case ICMP6_DST_UNREACH_NOPORT:
50982cd038dSYoshinobu Inoue 			code = PRC_UNREACH_PORT;
51082cd038dSYoshinobu Inoue 			break;
51182cd038dSYoshinobu Inoue 		default:
51282cd038dSYoshinobu Inoue 			goto badcode;
51382cd038dSYoshinobu Inoue 		}
51482cd038dSYoshinobu Inoue 		goto deliver;
51582cd038dSYoshinobu Inoue 		break;
51682cd038dSYoshinobu Inoue 
51782cd038dSYoshinobu Inoue 	case ICMP6_PACKET_TOO_BIG:
51829dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig);
51982cd038dSYoshinobu Inoue 
520aaff9927SHajimu UMEMOTO 		/* validation is made in icmp6_mtudisc_update */
521aaff9927SHajimu UMEMOTO 
52282cd038dSYoshinobu Inoue 		code = PRC_MSGSIZE;
52382cd038dSYoshinobu Inoue 
524686cdd19SJun-ichiro itojun Hagino 		/*
525686cdd19SJun-ichiro itojun Hagino 		 * Updating the path MTU will be done after examining
526686cdd19SJun-ichiro itojun Hagino 		 * intermediate extension headers.
527686cdd19SJun-ichiro itojun Hagino 		 */
52882cd038dSYoshinobu Inoue 		goto deliver;
52982cd038dSYoshinobu Inoue 		break;
53082cd038dSYoshinobu Inoue 
53182cd038dSYoshinobu Inoue 	case ICMP6_TIME_EXCEEDED:
53229dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_timeexceed);
53382cd038dSYoshinobu Inoue 		switch (code) {
53482cd038dSYoshinobu Inoue 		case ICMP6_TIME_EXCEED_TRANSIT:
5352ce62dceSSUZUKI Shinsuke 			code = PRC_TIMXCEED_INTRANS;
5362ce62dceSSUZUKI Shinsuke 			break;
53782cd038dSYoshinobu Inoue 		case ICMP6_TIME_EXCEED_REASSEMBLY:
5382ce62dceSSUZUKI Shinsuke 			code = PRC_TIMXCEED_REASS;
53982cd038dSYoshinobu Inoue 			break;
54082cd038dSYoshinobu Inoue 		default:
54182cd038dSYoshinobu Inoue 			goto badcode;
54282cd038dSYoshinobu Inoue 		}
54382cd038dSYoshinobu Inoue 		goto deliver;
54482cd038dSYoshinobu Inoue 		break;
54582cd038dSYoshinobu Inoue 
54682cd038dSYoshinobu Inoue 	case ICMP6_PARAM_PROB:
54729dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_paramprob);
54882cd038dSYoshinobu Inoue 		switch (code) {
54982cd038dSYoshinobu Inoue 		case ICMP6_PARAMPROB_NEXTHEADER:
55082cd038dSYoshinobu Inoue 			code = PRC_UNREACH_PROTOCOL;
55182cd038dSYoshinobu Inoue 			break;
55282cd038dSYoshinobu Inoue 		case ICMP6_PARAMPROB_HEADER:
55382cd038dSYoshinobu Inoue 		case ICMP6_PARAMPROB_OPTION:
55482cd038dSYoshinobu Inoue 			code = PRC_PARAMPROB;
55582cd038dSYoshinobu Inoue 			break;
55682cd038dSYoshinobu Inoue 		default:
55782cd038dSYoshinobu Inoue 			goto badcode;
55882cd038dSYoshinobu Inoue 		}
55982cd038dSYoshinobu Inoue 		goto deliver;
56082cd038dSYoshinobu Inoue 		break;
56182cd038dSYoshinobu Inoue 
56282cd038dSYoshinobu Inoue 	case ICMP6_ECHO_REQUEST:
56329dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_echo);
56482cd038dSYoshinobu Inoue 		if (code != 0)
56582cd038dSYoshinobu Inoue 			goto badcode;
56682cd038dSYoshinobu Inoue 		if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
56782cd038dSYoshinobu Inoue 			/* Give up remote */
56882cd038dSYoshinobu Inoue 			break;
56982cd038dSYoshinobu Inoue 		}
570686cdd19SJun-ichiro itojun Hagino 		if ((n->m_flags & M_EXT) != 0
571686cdd19SJun-ichiro itojun Hagino 		 || n->m_len < off + sizeof(struct icmp6_hdr)) {
57282cd038dSYoshinobu Inoue 			struct mbuf *n0 = n;
573686cdd19SJun-ichiro itojun Hagino 			const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
5742268ca47SSam Leffler 			int n0len;
57582cd038dSYoshinobu Inoue 
576a163d034SWarner Losh 			MGETHDR(n, M_DONTWAIT, n0->m_type);
5775c47350dSSam Leffler 			n0len = n0->m_pkthdr.len;	/* save for use below */
5785c47350dSSam Leffler 			if (n)
5795c47350dSSam Leffler 				M_MOVE_PKTHDR(n, n0);
580686cdd19SJun-ichiro itojun Hagino 			if (n && maxlen >= MHLEN) {
581a163d034SWarner Losh 				MCLGET(n, M_DONTWAIT);
582686cdd19SJun-ichiro itojun Hagino 				if ((n->m_flags & M_EXT) == 0) {
583686cdd19SJun-ichiro itojun Hagino 					m_free(n);
584686cdd19SJun-ichiro itojun Hagino 					n = NULL;
585686cdd19SJun-ichiro itojun Hagino 				}
586686cdd19SJun-ichiro itojun Hagino 			}
58782cd038dSYoshinobu Inoue 			if (n == NULL) {
58882cd038dSYoshinobu Inoue 				/* Give up remote */
58982cd038dSYoshinobu Inoue 				m_freem(n0);
59082cd038dSYoshinobu Inoue 				break;
59182cd038dSYoshinobu Inoue 			}
59282cd038dSYoshinobu Inoue 			/*
59382cd038dSYoshinobu Inoue 			 * Copy IPv6 and ICMPv6 only.
59482cd038dSYoshinobu Inoue 			 */
59582cd038dSYoshinobu Inoue 			nip6 = mtod(n, struct ip6_hdr *);
59682cd038dSYoshinobu Inoue 			bcopy(ip6, nip6, sizeof(struct ip6_hdr));
59782cd038dSYoshinobu Inoue 			nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
59882cd038dSYoshinobu Inoue 			bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
59982cd038dSYoshinobu Inoue 			noff = sizeof(struct ip6_hdr);
6002268ca47SSam Leffler 			/* new mbuf contains only ipv6+icmpv6 headers */
6012268ca47SSam Leffler 			n->m_len = noff + sizeof(struct icmp6_hdr);
602686cdd19SJun-ichiro itojun Hagino 			/*
603686cdd19SJun-ichiro itojun Hagino 			 * Adjust mbuf.  ip6_plen will be adjusted in
604686cdd19SJun-ichiro itojun Hagino 			 * ip6_output().
605686cdd19SJun-ichiro itojun Hagino 			 */
606686cdd19SJun-ichiro itojun Hagino 			m_adj(n0, off + sizeof(struct icmp6_hdr));
6072268ca47SSam Leffler 			/* recalculate complete packet size */
6082268ca47SSam Leffler 			n->m_pkthdr.len = n0len + (noff - off);
609686cdd19SJun-ichiro itojun Hagino 			n->m_next = n0;
61082cd038dSYoshinobu Inoue 		} else {
61182cd038dSYoshinobu Inoue 			nip6 = mtod(n, struct ip6_hdr *);
6126a550ab3SHajimu UMEMOTO 			IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
6136a550ab3SHajimu UMEMOTO 			    sizeof(*nicmp6));
61482cd038dSYoshinobu Inoue 			noff = off;
61582cd038dSYoshinobu Inoue 		}
61682cd038dSYoshinobu Inoue 		nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
61782cd038dSYoshinobu Inoue 		nicmp6->icmp6_code = 0;
61882cd038dSYoshinobu Inoue 		if (n) {
619e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_reflect);
620e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]);
62182cd038dSYoshinobu Inoue 			icmp6_reflect(n, noff);
62282cd038dSYoshinobu Inoue 		}
62382cd038dSYoshinobu Inoue 		break;
62482cd038dSYoshinobu Inoue 
62582cd038dSYoshinobu Inoue 	case ICMP6_ECHO_REPLY:
62629dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_echoreply);
62782cd038dSYoshinobu Inoue 		if (code != 0)
62882cd038dSYoshinobu Inoue 			goto badcode;
62982cd038dSYoshinobu Inoue 		break;
63082cd038dSYoshinobu Inoue 
63181170631SHajimu UMEMOTO 	case MLD_LISTENER_QUERY:
63281170631SHajimu UMEMOTO 	case MLD_LISTENER_REPORT:
63333cde130SBruce M Simpson 	case MLD_LISTENER_DONE:
63433cde130SBruce M Simpson 	case MLDV2_LISTENER_REPORT:
63533cde130SBruce M Simpson 		/*
63629dc7bc6SBruce M Simpson 		 * Drop MLD traffic which is not link-local, has a hop limit
63729dc7bc6SBruce M Simpson 		 * of greater than 1 hop, or which does not have the
63829dc7bc6SBruce M Simpson 		 * IPv6 HBH Router Alert option.
63929dc7bc6SBruce M Simpson 		 * As IPv6 HBH options are stripped in ip6_input() we must
64029dc7bc6SBruce M Simpson 		 * check an mbuf header flag.
64133cde130SBruce M Simpson 		 * XXX Should we also sanity check that these messages
64233cde130SBruce M Simpson 		 * were directed to a link-local multicast prefix?
64333cde130SBruce M Simpson 		 */
64429dc7bc6SBruce M Simpson 		if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0)
645686cdd19SJun-ichiro itojun Hagino 			goto freeit;
64633cde130SBruce M Simpson 		if (mld_input(m, off, icmp6len) != 0)
64733cde130SBruce M Simpson 			return (IPPROTO_DONE);
64882cd038dSYoshinobu Inoue 		/* m stays. */
64982cd038dSYoshinobu Inoue 		break;
65082cd038dSYoshinobu Inoue 
65182cd038dSYoshinobu Inoue 	case ICMP6_WRUREQUEST:	/* ICMP6_FQDN_QUERY */
65282cd038dSYoshinobu Inoue 	    {
65382cd038dSYoshinobu Inoue 		enum { WRU, FQDN } mode;
65482cd038dSYoshinobu Inoue 
655603724d3SBjoern A. Zeeb 		if (!V_icmp6_nodeinfo)
656686cdd19SJun-ichiro itojun Hagino 			break;
657686cdd19SJun-ichiro itojun Hagino 
65882cd038dSYoshinobu Inoue 		if (icmp6len == sizeof(struct icmp6_hdr) + 4)
65982cd038dSYoshinobu Inoue 			mode = WRU;
660686cdd19SJun-ichiro itojun Hagino 		else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
66182cd038dSYoshinobu Inoue 			mode = FQDN;
66282cd038dSYoshinobu Inoue 		else
66382cd038dSYoshinobu Inoue 			goto badlen;
66482cd038dSYoshinobu Inoue 
66582cd038dSYoshinobu Inoue 		if (mode == FQDN) {
666686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
66782cd038dSYoshinobu Inoue 			IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
66882cd038dSYoshinobu Inoue 			    IPPROTO_DONE);
669686cdd19SJun-ichiro itojun Hagino #endif
670686cdd19SJun-ichiro itojun Hagino 			n = m_copy(m, 0, M_COPYALL);
671686cdd19SJun-ichiro itojun Hagino 			if (n)
672686cdd19SJun-ichiro itojun Hagino 				n = ni6_input(n, off);
673686cdd19SJun-ichiro itojun Hagino 			/* XXX meaningless if n == NULL */
67482cd038dSYoshinobu Inoue 			noff = sizeof(struct ip6_hdr);
67582cd038dSYoshinobu Inoue 		} else {
67676ca6f88SJamie Gritton 			struct prison *pr;
67782cd038dSYoshinobu Inoue 			u_char *p;
67876ca6f88SJamie Gritton 			int maxlen, maxhlen, hlen;
67982cd038dSYoshinobu Inoue 
68018706985SJINMEI Tatuya 			/*
68118706985SJINMEI Tatuya 			 * XXX: this combination of flags is pointless,
68218706985SJINMEI Tatuya 			 * but should we keep this for compatibility?
68318706985SJINMEI Tatuya 			 */
684603724d3SBjoern A. Zeeb 			if ((V_icmp6_nodeinfo & 5) != 5)
68533841545SHajimu UMEMOTO 				break;
68633841545SHajimu UMEMOTO 
687686cdd19SJun-ichiro itojun Hagino 			if (code != 0)
688686cdd19SJun-ichiro itojun Hagino 				goto badcode;
689686cdd19SJun-ichiro itojun Hagino 			maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
690686cdd19SJun-ichiro itojun Hagino 			if (maxlen >= MCLBYTES) {
691686cdd19SJun-ichiro itojun Hagino 				/* Give up remote */
692686cdd19SJun-ichiro itojun Hagino 				break;
693686cdd19SJun-ichiro itojun Hagino 			}
694a163d034SWarner Losh 			MGETHDR(n, M_DONTWAIT, m->m_type);
695686cdd19SJun-ichiro itojun Hagino 			if (n && maxlen > MHLEN) {
696a163d034SWarner Losh 				MCLGET(n, M_DONTWAIT);
697686cdd19SJun-ichiro itojun Hagino 				if ((n->m_flags & M_EXT) == 0) {
698686cdd19SJun-ichiro itojun Hagino 					m_free(n);
699686cdd19SJun-ichiro itojun Hagino 					n = NULL;
700686cdd19SJun-ichiro itojun Hagino 				}
701686cdd19SJun-ichiro itojun Hagino 			}
70231a94603SBruce M Simpson 			if (n && !m_dup_pkthdr(n, m, M_DONTWAIT)) {
7039967cafcSSam Leffler 				/*
7049967cafcSSam Leffler 				 * Previous code did a blind M_COPY_PKTHDR
7059967cafcSSam Leffler 				 * and said "just for rcvif".  If true, then
7069967cafcSSam Leffler 				 * we could tolerate the dup failing (due to
7079967cafcSSam Leffler 				 * the deep copy of the tag chain).  For now
7089967cafcSSam Leffler 				 * be conservative and just fail.
7099967cafcSSam Leffler 				 */
7109967cafcSSam Leffler 				m_free(n);
7119967cafcSSam Leffler 				n = NULL;
7129967cafcSSam Leffler 			}
71382cd038dSYoshinobu Inoue 			if (n == NULL) {
71482cd038dSYoshinobu Inoue 				/* Give up remote */
71582cd038dSYoshinobu Inoue 				break;
71682cd038dSYoshinobu Inoue 			}
71733841545SHajimu UMEMOTO 			n->m_pkthdr.rcvif = NULL;
718686cdd19SJun-ichiro itojun Hagino 			n->m_len = 0;
719686cdd19SJun-ichiro itojun Hagino 			maxhlen = M_TRAILINGSPACE(n) - maxlen;
72076ca6f88SJamie Gritton 			pr = curthread->td_ucred->cr_prison;
72176ca6f88SJamie Gritton 			mtx_lock(&pr->pr_mtx);
722c1f19219SJamie Gritton 			hlen = strlen(pr->pr_hostname);
72376ca6f88SJamie Gritton 			if (maxhlen > hlen)
72476ca6f88SJamie Gritton 				maxhlen = hlen;
72582cd038dSYoshinobu Inoue 			/*
72682cd038dSYoshinobu Inoue 			 * Copy IPv6 and ICMPv6 only.
72782cd038dSYoshinobu Inoue 			 */
72882cd038dSYoshinobu Inoue 			nip6 = mtod(n, struct ip6_hdr *);
72982cd038dSYoshinobu Inoue 			bcopy(ip6, nip6, sizeof(struct ip6_hdr));
73082cd038dSYoshinobu Inoue 			nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
73182cd038dSYoshinobu Inoue 			bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
73282cd038dSYoshinobu Inoue 			p = (u_char *)(nicmp6 + 1);
73382cd038dSYoshinobu Inoue 			bzero(p, 4);
734c1f19219SJamie Gritton 			/* meaningless TTL */
735c1f19219SJamie Gritton 			bcopy(pr->pr_hostname, p + 4, maxhlen);
73676ca6f88SJamie Gritton 			mtx_unlock(&pr->pr_mtx);
73782cd038dSYoshinobu Inoue 			noff = sizeof(struct ip6_hdr);
73882cd038dSYoshinobu Inoue 			n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
739686cdd19SJun-ichiro itojun Hagino 				sizeof(struct icmp6_hdr) + 4 + maxhlen;
74082cd038dSYoshinobu Inoue 			nicmp6->icmp6_type = ICMP6_WRUREPLY;
74182cd038dSYoshinobu Inoue 			nicmp6->icmp6_code = 0;
74282cd038dSYoshinobu Inoue 		}
74382cd038dSYoshinobu Inoue 		if (n) {
744e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_reflect);
745e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]);
74682cd038dSYoshinobu Inoue 			icmp6_reflect(n, noff);
74782cd038dSYoshinobu Inoue 		}
74882cd038dSYoshinobu Inoue 		break;
74982cd038dSYoshinobu Inoue 	    }
75082cd038dSYoshinobu Inoue 
75182cd038dSYoshinobu Inoue 	case ICMP6_WRUREPLY:
75282cd038dSYoshinobu Inoue 		if (code != 0)
75382cd038dSYoshinobu Inoue 			goto badcode;
75482cd038dSYoshinobu Inoue 		break;
75582cd038dSYoshinobu Inoue 
75682cd038dSYoshinobu Inoue 	case ND_ROUTER_SOLICIT:
75729dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_routersolicit);
75882cd038dSYoshinobu Inoue 		if (code != 0)
75982cd038dSYoshinobu Inoue 			goto badcode;
76082cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_router_solicit))
76182cd038dSYoshinobu Inoue 			goto badlen;
762a163d034SWarner Losh 		if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
763686cdd19SJun-ichiro itojun Hagino 			/* give up local */
76482cd038dSYoshinobu Inoue 			nd6_rs_input(m, off, icmp6len);
765686cdd19SJun-ichiro itojun Hagino 			m = NULL;
766686cdd19SJun-ichiro itojun Hagino 			goto freeit;
767686cdd19SJun-ichiro itojun Hagino 		}
768686cdd19SJun-ichiro itojun Hagino 		nd6_rs_input(n, off, icmp6len);
76982cd038dSYoshinobu Inoue 		/* m stays. */
77082cd038dSYoshinobu Inoue 		break;
77182cd038dSYoshinobu Inoue 
77282cd038dSYoshinobu Inoue 	case ND_ROUTER_ADVERT:
77329dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_routeradvert);
77482cd038dSYoshinobu Inoue 		if (code != 0)
77582cd038dSYoshinobu Inoue 			goto badcode;
77682cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_router_advert))
77782cd038dSYoshinobu Inoue 			goto badlen;
778a163d034SWarner Losh 		if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
779686cdd19SJun-ichiro itojun Hagino 			/* give up local */
78082cd038dSYoshinobu Inoue 			nd6_ra_input(m, off, icmp6len);
781686cdd19SJun-ichiro itojun Hagino 			m = NULL;
782686cdd19SJun-ichiro itojun Hagino 			goto freeit;
783686cdd19SJun-ichiro itojun Hagino 		}
784686cdd19SJun-ichiro itojun Hagino 		nd6_ra_input(n, off, icmp6len);
78582cd038dSYoshinobu Inoue 		/* m stays. */
78682cd038dSYoshinobu Inoue 		break;
78782cd038dSYoshinobu Inoue 
78882cd038dSYoshinobu Inoue 	case ND_NEIGHBOR_SOLICIT:
78929dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit);
79082cd038dSYoshinobu Inoue 		if (code != 0)
79182cd038dSYoshinobu Inoue 			goto badcode;
79282cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_neighbor_solicit))
79382cd038dSYoshinobu Inoue 			goto badlen;
794a163d034SWarner Losh 		if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
795686cdd19SJun-ichiro itojun Hagino 			/* give up local */
79682cd038dSYoshinobu Inoue 			nd6_ns_input(m, off, icmp6len);
797686cdd19SJun-ichiro itojun Hagino 			m = NULL;
798686cdd19SJun-ichiro itojun Hagino 			goto freeit;
799686cdd19SJun-ichiro itojun Hagino 		}
800686cdd19SJun-ichiro itojun Hagino 		nd6_ns_input(n, off, icmp6len);
80182cd038dSYoshinobu Inoue 		/* m stays. */
80282cd038dSYoshinobu Inoue 		break;
80382cd038dSYoshinobu Inoue 
80482cd038dSYoshinobu Inoue 	case ND_NEIGHBOR_ADVERT:
80529dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert);
80682cd038dSYoshinobu Inoue 		if (code != 0)
80782cd038dSYoshinobu Inoue 			goto badcode;
80882cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_neighbor_advert))
80982cd038dSYoshinobu Inoue 			goto badlen;
810a163d034SWarner Losh 		if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
811686cdd19SJun-ichiro itojun Hagino 			/* give up local */
81282cd038dSYoshinobu Inoue 			nd6_na_input(m, off, icmp6len);
813686cdd19SJun-ichiro itojun Hagino 			m = NULL;
814686cdd19SJun-ichiro itojun Hagino 			goto freeit;
815686cdd19SJun-ichiro itojun Hagino 		}
816686cdd19SJun-ichiro itojun Hagino 		nd6_na_input(n, off, icmp6len);
81782cd038dSYoshinobu Inoue 		/* m stays. */
81882cd038dSYoshinobu Inoue 		break;
81982cd038dSYoshinobu Inoue 
82082cd038dSYoshinobu Inoue 	case ND_REDIRECT:
82129dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_redirect);
82282cd038dSYoshinobu Inoue 		if (code != 0)
82382cd038dSYoshinobu Inoue 			goto badcode;
82482cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_redirect))
82582cd038dSYoshinobu Inoue 			goto badlen;
826a163d034SWarner Losh 		if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
827686cdd19SJun-ichiro itojun Hagino 			/* give up local */
82882cd038dSYoshinobu Inoue 			icmp6_redirect_input(m, off);
829686cdd19SJun-ichiro itojun Hagino 			m = NULL;
830686cdd19SJun-ichiro itojun Hagino 			goto freeit;
831686cdd19SJun-ichiro itojun Hagino 		}
832686cdd19SJun-ichiro itojun Hagino 		icmp6_redirect_input(n, off);
83382cd038dSYoshinobu Inoue 		/* m stays. */
83482cd038dSYoshinobu Inoue 		break;
83582cd038dSYoshinobu Inoue 
83682cd038dSYoshinobu Inoue 	case ICMP6_ROUTER_RENUMBERING:
83782cd038dSYoshinobu Inoue 		if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
83882cd038dSYoshinobu Inoue 		    code != ICMP6_ROUTER_RENUMBERING_RESULT)
83982cd038dSYoshinobu Inoue 			goto badcode;
84082cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct icmp6_router_renum))
84182cd038dSYoshinobu Inoue 			goto badlen;
84282cd038dSYoshinobu Inoue 		break;
84382cd038dSYoshinobu Inoue 
84482cd038dSYoshinobu Inoue 	default:
84533841545SHajimu UMEMOTO 		nd6log((LOG_DEBUG,
84633841545SHajimu UMEMOTO 		    "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
8471d54aa3bSBjoern A. Zeeb 		    icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
8481d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6bufd, &ip6->ip6_dst),
84929dc7bc6SBruce M Simpson 		    ifp ? ifp->if_index : 0));
85082cd038dSYoshinobu Inoue 		if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
85182cd038dSYoshinobu Inoue 			/* ICMPv6 error: MUST deliver it by spec... */
85282cd038dSYoshinobu Inoue 			code = PRC_NCMDS;
85382cd038dSYoshinobu Inoue 			/* deliver */
85482cd038dSYoshinobu Inoue 		} else {
85582cd038dSYoshinobu Inoue 			/* ICMPv6 informational: MUST not deliver */
85682cd038dSYoshinobu Inoue 			break;
85782cd038dSYoshinobu Inoue 		}
85882cd038dSYoshinobu Inoue 	deliver:
8599c0fda72SHajimu UMEMOTO 		if (icmp6_notify_error(&m, off, icmp6len, code)) {
86033841545SHajimu UMEMOTO 			/* In this case, m should've been freed. */
86133841545SHajimu UMEMOTO 			return (IPPROTO_DONE);
86233841545SHajimu UMEMOTO 		}
86333841545SHajimu UMEMOTO 		break;
86433841545SHajimu UMEMOTO 
86533841545SHajimu UMEMOTO 	badcode:
866e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_badcode);
86733841545SHajimu UMEMOTO 		break;
86833841545SHajimu UMEMOTO 
86933841545SHajimu UMEMOTO 	badlen:
870e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_badlen);
87133841545SHajimu UMEMOTO 		break;
87233841545SHajimu UMEMOTO 	}
87333841545SHajimu UMEMOTO 
87433841545SHajimu UMEMOTO 	/* deliver the packet to appropriate sockets */
87533841545SHajimu UMEMOTO 	icmp6_rip6_input(&m, *offp);
87633841545SHajimu UMEMOTO 
87733841545SHajimu UMEMOTO 	return IPPROTO_DONE;
87833841545SHajimu UMEMOTO 
87933841545SHajimu UMEMOTO  freeit:
88033841545SHajimu UMEMOTO 	m_freem(m);
88133841545SHajimu UMEMOTO 	return IPPROTO_DONE;
88233841545SHajimu UMEMOTO }
88333841545SHajimu UMEMOTO 
88433841545SHajimu UMEMOTO static int
8851272577eSXin LI icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code)
88633841545SHajimu UMEMOTO {
8878b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
8889c0fda72SHajimu UMEMOTO 	struct mbuf *m = *mp;
88933841545SHajimu UMEMOTO 	struct icmp6_hdr *icmp6;
89033841545SHajimu UMEMOTO 	struct ip6_hdr *eip6;
89133841545SHajimu UMEMOTO 	u_int32_t notifymtu;
89233841545SHajimu UMEMOTO 	struct sockaddr_in6 icmp6src, icmp6dst;
89333841545SHajimu UMEMOTO 
89482cd038dSYoshinobu Inoue 	if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
895e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
89682cd038dSYoshinobu Inoue 		goto freeit;
89782cd038dSYoshinobu Inoue 	}
898686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
89982cd038dSYoshinobu Inoue 	IP6_EXTHDR_CHECK(m, off,
90006cd0a3fSHajimu UMEMOTO 	    sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1);
90182cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
902686cdd19SJun-ichiro itojun Hagino #else
903686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
904686cdd19SJun-ichiro itojun Hagino 	    sizeof(*icmp6) + sizeof(struct ip6_hdr));
905686cdd19SJun-ichiro itojun Hagino 	if (icmp6 == NULL) {
906e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
90733841545SHajimu UMEMOTO 		return (-1);
908686cdd19SJun-ichiro itojun Hagino 	}
909686cdd19SJun-ichiro itojun Hagino #endif
91033841545SHajimu UMEMOTO 	eip6 = (struct ip6_hdr *)(icmp6 + 1);
91182cd038dSYoshinobu Inoue 
91282cd038dSYoshinobu Inoue 	/* Detect the upper level protocol */
91382cd038dSYoshinobu Inoue 	{
9149233d8f3SDavid E. O'Brien 		void (*ctlfunc)(int, struct sockaddr *, void *);
91582cd038dSYoshinobu Inoue 		u_int8_t nxt = eip6->ip6_nxt;
91682cd038dSYoshinobu Inoue 		int eoff = off + sizeof(struct icmp6_hdr) +
91782cd038dSYoshinobu Inoue 		    sizeof(struct ip6_hdr);
91882cd038dSYoshinobu Inoue 		struct ip6ctlparam ip6cp;
919686cdd19SJun-ichiro itojun Hagino 		struct in6_addr *finaldst = NULL;
920686cdd19SJun-ichiro itojun Hagino 		int icmp6type = icmp6->icmp6_type;
921686cdd19SJun-ichiro itojun Hagino 		struct ip6_frag *fh;
922686cdd19SJun-ichiro itojun Hagino 		struct ip6_rthdr *rth;
923686cdd19SJun-ichiro itojun Hagino 		struct ip6_rthdr0 *rth0;
924686cdd19SJun-ichiro itojun Hagino 		int rthlen;
92582cd038dSYoshinobu Inoue 
92688ff5695SSUZUKI Shinsuke 		while (1) { /* XXX: should avoid infinite loop explicitly? */
92782cd038dSYoshinobu Inoue 			struct ip6_ext *eh;
92882cd038dSYoshinobu Inoue 
92982cd038dSYoshinobu Inoue 			switch (nxt) {
93082cd038dSYoshinobu Inoue 			case IPPROTO_HOPOPTS:
93182cd038dSYoshinobu Inoue 			case IPPROTO_DSTOPTS:
93282cd038dSYoshinobu Inoue 			case IPPROTO_AH:
933686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
93406cd0a3fSHajimu UMEMOTO 				IP6_EXTHDR_CHECK(m, 0,
93506cd0a3fSHajimu UMEMOTO 				    eoff + sizeof(struct ip6_ext), -1);
9360527d333SHajimu UMEMOTO 				eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff);
937686cdd19SJun-ichiro itojun Hagino #else
938686cdd19SJun-ichiro itojun Hagino 				IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
939686cdd19SJun-ichiro itojun Hagino 				    eoff, sizeof(*eh));
940686cdd19SJun-ichiro itojun Hagino 				if (eh == NULL) {
941e27b0c87SRobert Watson 					ICMP6STAT_INC(icp6s_tooshort);
94233841545SHajimu UMEMOTO 					return (-1);
943686cdd19SJun-ichiro itojun Hagino 				}
944686cdd19SJun-ichiro itojun Hagino #endif
945686cdd19SJun-ichiro itojun Hagino 
94682cd038dSYoshinobu Inoue 				if (nxt == IPPROTO_AH)
94782cd038dSYoshinobu Inoue 					eoff += (eh->ip6e_len + 2) << 2;
94882cd038dSYoshinobu Inoue 				else
94982cd038dSYoshinobu Inoue 					eoff += (eh->ip6e_len + 1) << 3;
95082cd038dSYoshinobu Inoue 				nxt = eh->ip6e_nxt;
95182cd038dSYoshinobu Inoue 				break;
952686cdd19SJun-ichiro itojun Hagino 			case IPPROTO_ROUTING:
953686cdd19SJun-ichiro itojun Hagino 				/*
954686cdd19SJun-ichiro itojun Hagino 				 * When the erroneous packet contains a
955686cdd19SJun-ichiro itojun Hagino 				 * routing header, we should examine the
956686cdd19SJun-ichiro itojun Hagino 				 * header to determine the final destination.
957686cdd19SJun-ichiro itojun Hagino 				 * Otherwise, we can't properly update
958686cdd19SJun-ichiro itojun Hagino 				 * information that depends on the final
959686cdd19SJun-ichiro itojun Hagino 				 * destination (e.g. path MTU).
960686cdd19SJun-ichiro itojun Hagino 				 */
961686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
96206cd0a3fSHajimu UMEMOTO 				IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1);
96306cd0a3fSHajimu UMEMOTO 				rth = (struct ip6_rthdr *)
96406cd0a3fSHajimu UMEMOTO 				    (mtod(m, caddr_t) + eoff);
965686cdd19SJun-ichiro itojun Hagino #else
966686cdd19SJun-ichiro itojun Hagino 				IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
967686cdd19SJun-ichiro itojun Hagino 				    eoff, sizeof(*rth));
968686cdd19SJun-ichiro itojun Hagino 				if (rth == NULL) {
969e27b0c87SRobert Watson 					ICMP6STAT_INC(icp6s_tooshort);
97033841545SHajimu UMEMOTO 					return (-1);
971686cdd19SJun-ichiro itojun Hagino 				}
972686cdd19SJun-ichiro itojun Hagino #endif
973686cdd19SJun-ichiro itojun Hagino 				rthlen = (rth->ip6r_len + 1) << 3;
974686cdd19SJun-ichiro itojun Hagino 				/*
975686cdd19SJun-ichiro itojun Hagino 				 * XXX: currently there is no
976686cdd19SJun-ichiro itojun Hagino 				 * officially defined type other
977686cdd19SJun-ichiro itojun Hagino 				 * than type-0.
978686cdd19SJun-ichiro itojun Hagino 				 * Note that if the segment left field
979686cdd19SJun-ichiro itojun Hagino 				 * is 0, all intermediate hops must
980686cdd19SJun-ichiro itojun Hagino 				 * have been passed.
981686cdd19SJun-ichiro itojun Hagino 				 */
982686cdd19SJun-ichiro itojun Hagino 				if (rth->ip6r_segleft &&
983686cdd19SJun-ichiro itojun Hagino 				    rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
984686cdd19SJun-ichiro itojun Hagino 					int hops;
985686cdd19SJun-ichiro itojun Hagino 
986686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
98706cd0a3fSHajimu UMEMOTO 					IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1);
98806cd0a3fSHajimu UMEMOTO 					rth0 = (struct ip6_rthdr0 *)
98906cd0a3fSHajimu UMEMOTO 					    (mtod(m, caddr_t) + eoff);
990686cdd19SJun-ichiro itojun Hagino #else
991686cdd19SJun-ichiro itojun Hagino 					IP6_EXTHDR_GET(rth0,
992686cdd19SJun-ichiro itojun Hagino 					    struct ip6_rthdr0 *, m,
993686cdd19SJun-ichiro itojun Hagino 					    eoff, rthlen);
994686cdd19SJun-ichiro itojun Hagino 					if (rth0 == NULL) {
995e27b0c87SRobert Watson 						ICMP6STAT_INC(icp6s_tooshort);
99633841545SHajimu UMEMOTO 						return (-1);
997686cdd19SJun-ichiro itojun Hagino 					}
998686cdd19SJun-ichiro itojun Hagino #endif
999686cdd19SJun-ichiro itojun Hagino 					/* just ignore a bogus header */
1000686cdd19SJun-ichiro itojun Hagino 					if ((rth0->ip6r0_len % 2) == 0 &&
1001686cdd19SJun-ichiro itojun Hagino 					    (hops = rth0->ip6r0_len/2))
1002686cdd19SJun-ichiro itojun Hagino 						finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
1003686cdd19SJun-ichiro itojun Hagino 				}
1004686cdd19SJun-ichiro itojun Hagino 				eoff += rthlen;
1005686cdd19SJun-ichiro itojun Hagino 				nxt = rth->ip6r_nxt;
1006686cdd19SJun-ichiro itojun Hagino 				break;
1007686cdd19SJun-ichiro itojun Hagino 			case IPPROTO_FRAGMENT:
1008686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
1009686cdd19SJun-ichiro itojun Hagino 				IP6_EXTHDR_CHECK(m, 0, eoff +
101006cd0a3fSHajimu UMEMOTO 				    sizeof(struct ip6_frag), -1);
101106cd0a3fSHajimu UMEMOTO 				fh = (struct ip6_frag *)(mtod(m, caddr_t) +
101206cd0a3fSHajimu UMEMOTO 				    eoff);
1013686cdd19SJun-ichiro itojun Hagino #else
1014686cdd19SJun-ichiro itojun Hagino 				IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1015686cdd19SJun-ichiro itojun Hagino 				    eoff, sizeof(*fh));
1016686cdd19SJun-ichiro itojun Hagino 				if (fh == NULL) {
1017e27b0c87SRobert Watson 					ICMP6STAT_INC(icp6s_tooshort);
101833841545SHajimu UMEMOTO 					return (-1);
1019686cdd19SJun-ichiro itojun Hagino 				}
1020686cdd19SJun-ichiro itojun Hagino #endif
1021686cdd19SJun-ichiro itojun Hagino 				/*
1022686cdd19SJun-ichiro itojun Hagino 				 * Data after a fragment header is meaningless
1023686cdd19SJun-ichiro itojun Hagino 				 * unless it is the first fragment, but
1024686cdd19SJun-ichiro itojun Hagino 				 * we'll go to the notify label for path MTU
1025686cdd19SJun-ichiro itojun Hagino 				 * discovery.
1026686cdd19SJun-ichiro itojun Hagino 				 */
1027686cdd19SJun-ichiro itojun Hagino 				if (fh->ip6f_offlg & IP6F_OFF_MASK)
1028686cdd19SJun-ichiro itojun Hagino 					goto notify;
1029686cdd19SJun-ichiro itojun Hagino 
1030686cdd19SJun-ichiro itojun Hagino 				eoff += sizeof(struct ip6_frag);
1031686cdd19SJun-ichiro itojun Hagino 				nxt = fh->ip6f_nxt;
1032686cdd19SJun-ichiro itojun Hagino 				break;
103382cd038dSYoshinobu Inoue 			default:
1034686cdd19SJun-ichiro itojun Hagino 				/*
1035686cdd19SJun-ichiro itojun Hagino 				 * This case includes ESP and the No Next
1036686cdd19SJun-ichiro itojun Hagino 				 * Header.  In such cases going to the notify
1037686cdd19SJun-ichiro itojun Hagino 				 * label does not have any meaning
1038686cdd19SJun-ichiro itojun Hagino 				 * (i.e. ctlfunc will be NULL), but we go
1039686cdd19SJun-ichiro itojun Hagino 				 * anyway since we might have to update
1040686cdd19SJun-ichiro itojun Hagino 				 * path MTU information.
1041686cdd19SJun-ichiro itojun Hagino 				 */
104282cd038dSYoshinobu Inoue 				goto notify;
104382cd038dSYoshinobu Inoue 			}
104482cd038dSYoshinobu Inoue 		}
104582cd038dSYoshinobu Inoue 	  notify:
1046686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
104782cd038dSYoshinobu Inoue 		icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1048686cdd19SJun-ichiro itojun Hagino #else
1049686cdd19SJun-ichiro itojun Hagino 		IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1050686cdd19SJun-ichiro itojun Hagino 		    sizeof(*icmp6) + sizeof(struct ip6_hdr));
1051686cdd19SJun-ichiro itojun Hagino 		if (icmp6 == NULL) {
1052e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_tooshort);
105333841545SHajimu UMEMOTO 			return (-1);
1054686cdd19SJun-ichiro itojun Hagino 		}
1055686cdd19SJun-ichiro itojun Hagino #endif
105633841545SHajimu UMEMOTO 
105706cd0a3fSHajimu UMEMOTO 		/*
105806cd0a3fSHajimu UMEMOTO 		 * retrieve parameters from the inner IPv6 header, and convert
105906cd0a3fSHajimu UMEMOTO 		 * them into sockaddr structures.
106006cd0a3fSHajimu UMEMOTO 		 * XXX: there is no guarantee that the source or destination
106106cd0a3fSHajimu UMEMOTO 		 * addresses of the inner packet are in the same scope as
106206cd0a3fSHajimu UMEMOTO 		 * the addresses of the icmp packet.  But there is no other
106306cd0a3fSHajimu UMEMOTO 		 * way to determine the zone.
106406cd0a3fSHajimu UMEMOTO 		 */
106533841545SHajimu UMEMOTO 		eip6 = (struct ip6_hdr *)(icmp6 + 1);
106606cd0a3fSHajimu UMEMOTO 
106733841545SHajimu UMEMOTO 		bzero(&icmp6dst, sizeof(icmp6dst));
106833841545SHajimu UMEMOTO 		icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
106933841545SHajimu UMEMOTO 		icmp6dst.sin6_family = AF_INET6;
1070686cdd19SJun-ichiro itojun Hagino 		if (finaldst == NULL)
107133841545SHajimu UMEMOTO 			icmp6dst.sin6_addr = eip6->ip6_dst;
107233841545SHajimu UMEMOTO 		else
107333841545SHajimu UMEMOTO 			icmp6dst.sin6_addr = *finaldst;
1074a1f7e5f8SHajimu UMEMOTO 		if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
10759a4f9608SHajimu UMEMOTO 			goto freeit;
107633841545SHajimu UMEMOTO 		bzero(&icmp6src, sizeof(icmp6src));
107733841545SHajimu UMEMOTO 		icmp6src.sin6_len = sizeof(struct sockaddr_in6);
107833841545SHajimu UMEMOTO 		icmp6src.sin6_family = AF_INET6;
107933841545SHajimu UMEMOTO 		icmp6src.sin6_addr = eip6->ip6_src;
1080a1f7e5f8SHajimu UMEMOTO 		if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
10819a4f9608SHajimu UMEMOTO 			goto freeit;
1082a1f7e5f8SHajimu UMEMOTO 		icmp6src.sin6_flowinfo =
1083a1f7e5f8SHajimu UMEMOTO 		    (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
108433841545SHajimu UMEMOTO 
108533841545SHajimu UMEMOTO 		if (finaldst == NULL)
108633841545SHajimu UMEMOTO 			finaldst = &eip6->ip6_dst;
108733841545SHajimu UMEMOTO 		ip6cp.ip6c_m = m;
108833841545SHajimu UMEMOTO 		ip6cp.ip6c_icmp6 = icmp6;
108933841545SHajimu UMEMOTO 		ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
109033841545SHajimu UMEMOTO 		ip6cp.ip6c_off = eoff;
109133841545SHajimu UMEMOTO 		ip6cp.ip6c_finaldst = finaldst;
109233841545SHajimu UMEMOTO 		ip6cp.ip6c_src = &icmp6src;
109333841545SHajimu UMEMOTO 		ip6cp.ip6c_nxt = nxt;
109433841545SHajimu UMEMOTO 
109533841545SHajimu UMEMOTO 		if (icmp6type == ICMP6_PACKET_TOO_BIG) {
109633841545SHajimu UMEMOTO 			notifymtu = ntohl(icmp6->icmp6_mtu);
109733841545SHajimu UMEMOTO 			ip6cp.ip6c_cmdarg = (void *)&notifymtu;
109833841545SHajimu UMEMOTO 			icmp6_mtudisc_update(&ip6cp, 1);	/*XXX*/
1099686cdd19SJun-ichiro itojun Hagino 		}
1100686cdd19SJun-ichiro itojun Hagino 
11019233d8f3SDavid E. O'Brien 		ctlfunc = (void (*)(int, struct sockaddr *, void *))
110282cd038dSYoshinobu Inoue 		    (inet6sw[ip6_protox[nxt]].pr_ctlinput);
110382cd038dSYoshinobu Inoue 		if (ctlfunc) {
110433841545SHajimu UMEMOTO 			(void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
110533841545SHajimu UMEMOTO 			    &ip6cp);
110682cd038dSYoshinobu Inoue 		}
110782cd038dSYoshinobu Inoue 	}
11089c0fda72SHajimu UMEMOTO 	*mp = m;
110933841545SHajimu UMEMOTO 	return (0);
111082cd038dSYoshinobu Inoue 
111182cd038dSYoshinobu Inoue   freeit:
111282cd038dSYoshinobu Inoue 	m_freem(m);
111333841545SHajimu UMEMOTO 	return (-1);
111482cd038dSYoshinobu Inoue }
111582cd038dSYoshinobu Inoue 
111633841545SHajimu UMEMOTO void
11171272577eSXin LI icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1118686cdd19SJun-ichiro itojun Hagino {
11198b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
112033841545SHajimu UMEMOTO 	struct in6_addr *dst = ip6cp->ip6c_finaldst;
112133841545SHajimu UMEMOTO 	struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
112233841545SHajimu UMEMOTO 	struct mbuf *m = ip6cp->ip6c_m;	/* will be necessary for scope issue */
1123686cdd19SJun-ichiro itojun Hagino 	u_int mtu = ntohl(icmp6->icmp6_mtu);
112497d8d152SAndre Oppermann 	struct in_conninfo inc;
1125686cdd19SJun-ichiro itojun Hagino 
1126f95d4633SHajimu UMEMOTO #if 0
1127f95d4633SHajimu UMEMOTO 	/*
1128f95d4633SHajimu UMEMOTO 	 * RFC2460 section 5, last paragraph.
1129f95d4633SHajimu UMEMOTO 	 * even though minimum link MTU for IPv6 is IPV6_MMTU,
1130f95d4633SHajimu UMEMOTO 	 * we may see ICMPv6 too big with mtu < IPV6_MMTU
1131f95d4633SHajimu UMEMOTO 	 * due to packet translator in the middle.
1132f95d4633SHajimu UMEMOTO 	 * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
1133f95d4633SHajimu UMEMOTO 	 * special handling.
1134f95d4633SHajimu UMEMOTO 	 */
1135f95d4633SHajimu UMEMOTO 	if (mtu < IPV6_MMTU)
1136f95d4633SHajimu UMEMOTO 		return;
1137f95d4633SHajimu UMEMOTO #endif
1138f95d4633SHajimu UMEMOTO 
1139f95d4633SHajimu UMEMOTO 	/*
1140f95d4633SHajimu UMEMOTO 	 * we reject ICMPv6 too big with abnormally small value.
1141f95d4633SHajimu UMEMOTO 	 * XXX what is the good definition of "abnormally small"?
1142f95d4633SHajimu UMEMOTO 	 */
1143f95d4633SHajimu UMEMOTO 	if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1144f95d4633SHajimu UMEMOTO 		return;
1145f95d4633SHajimu UMEMOTO 
114633841545SHajimu UMEMOTO 	if (!validated)
114733841545SHajimu UMEMOTO 		return;
114833841545SHajimu UMEMOTO 
114959ca51adSSimon L. B. Nielsen 	/*
115059ca51adSSimon L. B. Nielsen 	 * In case the suggested mtu is less than IPV6_MMTU, we
115159ca51adSSimon L. B. Nielsen 	 * only need to remember that it was for above mentioned
115259ca51adSSimon L. B. Nielsen 	 * "alwaysfrag" case.
115359ca51adSSimon L. B. Nielsen 	 * Try to be as close to the spec as possible.
115459ca51adSSimon L. B. Nielsen 	 */
115559ca51adSSimon L. B. Nielsen 	if (mtu < IPV6_MMTU)
115659ca51adSSimon L. B. Nielsen 		mtu = IPV6_MMTU - 8;
115759ca51adSSimon L. B. Nielsen 
115897d8d152SAndre Oppermann 	bzero(&inc, sizeof(inc));
1159dcdb4371SBjoern A. Zeeb 	inc.inc_flags |= INC_ISIPV6;
116097d8d152SAndre Oppermann 	inc.inc6_faddr = *dst;
1161a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
1162a1f7e5f8SHajimu UMEMOTO 		return;
1163686cdd19SJun-ichiro itojun Hagino 
1164233dcce1SAndre Oppermann 	if (mtu < tcp_maxmtu6(&inc, NULL)) {
116597d8d152SAndre Oppermann 		tcp_hc_updatemtu(&inc, mtu);
1166e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_pmtuchg);
1167686cdd19SJun-ichiro itojun Hagino 	}
1168686cdd19SJun-ichiro itojun Hagino }
1169686cdd19SJun-ichiro itojun Hagino 
117082cd038dSYoshinobu Inoue /*
117133841545SHajimu UMEMOTO  * Process a Node Information Query packet, based on
117233841545SHajimu UMEMOTO  * draft-ietf-ipngwg-icmp-name-lookups-07.
1173686cdd19SJun-ichiro itojun Hagino  *
1174686cdd19SJun-ichiro itojun Hagino  * Spec incompatibilities:
1175686cdd19SJun-ichiro itojun Hagino  * - IPv6 Subject address handling
1176686cdd19SJun-ichiro itojun Hagino  * - IPv4 Subject address handling support missing
1177686cdd19SJun-ichiro itojun Hagino  * - Proxy reply (answer even if it's not for me)
1178686cdd19SJun-ichiro itojun Hagino  * - joins NI group address at in6_ifattach() time only, does not cope
1179686cdd19SJun-ichiro itojun Hagino  *   with hostname changes by sethostname(3)
118082cd038dSYoshinobu Inoue  */
118182cd038dSYoshinobu Inoue static struct mbuf *
11821272577eSXin LI ni6_input(struct mbuf *m, int off)
118382cd038dSYoshinobu Inoue {
11848b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
1185686cdd19SJun-ichiro itojun Hagino 	struct icmp6_nodeinfo *ni6, *nni6;
118682cd038dSYoshinobu Inoue 	struct mbuf *n = NULL;
118776ca6f88SJamie Gritton 	struct prison *pr;
1188686cdd19SJun-ichiro itojun Hagino 	u_int16_t qtype;
1189686cdd19SJun-ichiro itojun Hagino 	int subjlen;
119082cd038dSYoshinobu Inoue 	int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
119182cd038dSYoshinobu Inoue 	struct ni_reply_fqdn *fqdn;
119282cd038dSYoshinobu Inoue 	int addrs;		/* for NI_QTYPE_NODEADDR */
119382cd038dSYoshinobu Inoue 	struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1194a1f7e5f8SHajimu UMEMOTO 	struct in6_addr in6_subj; /* subject address */
1195686cdd19SJun-ichiro itojun Hagino 	struct ip6_hdr *ip6;
1196686cdd19SJun-ichiro itojun Hagino 	int oldfqdn = 0;	/* if 1, return pascal string (03 draft) */
119733841545SHajimu UMEMOTO 	char *subj = NULL;
119833841545SHajimu UMEMOTO 	struct in6_ifaddr *ia6 = NULL;
119982cd038dSYoshinobu Inoue 
1200686cdd19SJun-ichiro itojun Hagino 	ip6 = mtod(m, struct ip6_hdr *);
1201686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
1202686cdd19SJun-ichiro itojun Hagino 	ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1203686cdd19SJun-ichiro itojun Hagino #else
1204686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1205686cdd19SJun-ichiro itojun Hagino 	if (ni6 == NULL) {
1206686cdd19SJun-ichiro itojun Hagino 		/* m is already reclaimed */
120706cd0a3fSHajimu UMEMOTO 		return (NULL);
1208686cdd19SJun-ichiro itojun Hagino 	}
1209686cdd19SJun-ichiro itojun Hagino #endif
1210686cdd19SJun-ichiro itojun Hagino 
1211686cdd19SJun-ichiro itojun Hagino 	/*
121218706985SJINMEI Tatuya 	 * Validate IPv6 source address.
121318706985SJINMEI Tatuya 	 * The default configuration MUST be to refuse answering queries from
121418706985SJINMEI Tatuya 	 * global-scope addresses according to RFC4602.
121518706985SJINMEI Tatuya 	 * Notes:
121618706985SJINMEI Tatuya 	 *  - it's not very clear what "refuse" means; this implementation
121718706985SJINMEI Tatuya 	 *    simply drops it.
121818706985SJINMEI Tatuya 	 *  - it's not very easy to identify global-scope (unicast) addresses
121918706985SJINMEI Tatuya 	 *    since there are many prefixes for them.  It should be safer
122018706985SJINMEI Tatuya 	 *    and in practice sufficient to check "all" but loopback and
122118706985SJINMEI Tatuya 	 *    link-local (note that site-local unicast was deprecated and
122218706985SJINMEI Tatuya 	 *    ULA is defined as global scope-wise)
122318706985SJINMEI Tatuya 	 */
1224603724d3SBjoern A. Zeeb 	if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
122518706985SJINMEI Tatuya 	    !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
122618706985SJINMEI Tatuya 	    !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
122718706985SJINMEI Tatuya 		goto bad;
122818706985SJINMEI Tatuya 
122918706985SJINMEI Tatuya 	/*
1230686cdd19SJun-ichiro itojun Hagino 	 * Validate IPv6 destination address.
1231686cdd19SJun-ichiro itojun Hagino 	 *
123233841545SHajimu UMEMOTO 	 * The Responder must discard the Query without further processing
123333841545SHajimu UMEMOTO 	 * unless it is one of the Responder's unicast or anycast addresses, or
123433841545SHajimu UMEMOTO 	 * a link-local scope multicast address which the Responder has joined.
123518706985SJINMEI Tatuya 	 * [RFC4602, Section 5.]
1236686cdd19SJun-ichiro itojun Hagino 	 */
12372a5aafceSHajimu UMEMOTO 	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
12382a5aafceSHajimu UMEMOTO 		if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
12392a5aafceSHajimu UMEMOTO 			goto bad;
12402a5aafceSHajimu UMEMOTO 		/* else it's a link-local multicast, fine */
12412a5aafceSHajimu UMEMOTO 	} else {		/* unicast or anycast */
12422a5aafceSHajimu UMEMOTO 		if ((ia6 = ip6_getdstifaddr(m)) == NULL)
12432a5aafceSHajimu UMEMOTO 			goto bad; /* XXX impossible */
12442a5aafceSHajimu UMEMOTO 
12452a5aafceSHajimu UMEMOTO 		if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1246603724d3SBjoern A. Zeeb 		    !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
12478c0fec80SRobert Watson 			ifa_free(&ia6->ia_ifa);
124833841545SHajimu UMEMOTO 			nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
124933841545SHajimu UMEMOTO 				"a temporary address in %s:%d",
125033841545SHajimu UMEMOTO 			       __FILE__, __LINE__));
125133841545SHajimu UMEMOTO 			goto bad;
125233841545SHajimu UMEMOTO 		}
12538c0fec80SRobert Watson 		ifa_free(&ia6->ia_ifa);
12542a5aafceSHajimu UMEMOTO 	}
1255686cdd19SJun-ichiro itojun Hagino 
1256686cdd19SJun-ichiro itojun Hagino 	/* validate query Subject field. */
125733841545SHajimu UMEMOTO 	qtype = ntohs(ni6->ni_qtype);
1258686cdd19SJun-ichiro itojun Hagino 	subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1259686cdd19SJun-ichiro itojun Hagino 	switch (qtype) {
1260686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_NOOP:
1261686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_SUPTYPES:
126233841545SHajimu UMEMOTO 		/* 07 draft */
126333841545SHajimu UMEMOTO 		if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1264686cdd19SJun-ichiro itojun Hagino 			break;
126533841545SHajimu UMEMOTO 		/* FALLTHROUGH */
1266686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_FQDN:
1267686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_NODEADDR:
1268a22adbc6SSUZUKI Shinsuke 	case NI_QTYPE_IPV4ADDR:
1269686cdd19SJun-ichiro itojun Hagino 		switch (ni6->ni_code) {
1270686cdd19SJun-ichiro itojun Hagino 		case ICMP6_NI_SUBJ_IPV6:
1271686cdd19SJun-ichiro itojun Hagino #if ICMP6_NI_SUBJ_IPV6 != 0
1272686cdd19SJun-ichiro itojun Hagino 		case 0:
1273686cdd19SJun-ichiro itojun Hagino #endif
1274686cdd19SJun-ichiro itojun Hagino 			/*
1275686cdd19SJun-ichiro itojun Hagino 			 * backward compatibility - try to accept 03 draft
1276686cdd19SJun-ichiro itojun Hagino 			 * format, where no Subject is present.
1277686cdd19SJun-ichiro itojun Hagino 			 */
127833841545SHajimu UMEMOTO 			if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
127933841545SHajimu UMEMOTO 			    subjlen == 0) {
1280686cdd19SJun-ichiro itojun Hagino 				oldfqdn++;
1281686cdd19SJun-ichiro itojun Hagino 				break;
1282686cdd19SJun-ichiro itojun Hagino 			}
128333841545SHajimu UMEMOTO #if ICMP6_NI_SUBJ_IPV6 != 0
128433841545SHajimu UMEMOTO 			if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
128533841545SHajimu UMEMOTO 				goto bad;
128633841545SHajimu UMEMOTO #endif
1287686cdd19SJun-ichiro itojun Hagino 
12882a5aafceSHajimu UMEMOTO 			if (subjlen != sizeof(struct in6_addr))
1289686cdd19SJun-ichiro itojun Hagino 				goto bad;
1290686cdd19SJun-ichiro itojun Hagino 
1291686cdd19SJun-ichiro itojun Hagino 			/*
1292686cdd19SJun-ichiro itojun Hagino 			 * Validate Subject address.
1293686cdd19SJun-ichiro itojun Hagino 			 *
129433841545SHajimu UMEMOTO 			 * Not sure what exactly "address belongs to the node"
129533841545SHajimu UMEMOTO 			 * means in the spec, is it just unicast, or what?
1296686cdd19SJun-ichiro itojun Hagino 			 *
1297686cdd19SJun-ichiro itojun Hagino 			 * At this moment we consider Subject address as
1298686cdd19SJun-ichiro itojun Hagino 			 * "belong to the node" if the Subject address equals
1299686cdd19SJun-ichiro itojun Hagino 			 * to the IPv6 destination address; validation for
1300686cdd19SJun-ichiro itojun Hagino 			 * IPv6 destination address should have done enough
1301686cdd19SJun-ichiro itojun Hagino 			 * check for us.
1302686cdd19SJun-ichiro itojun Hagino 			 *
1303686cdd19SJun-ichiro itojun Hagino 			 * We do not do proxy at this moment.
1304686cdd19SJun-ichiro itojun Hagino 			 */
1305686cdd19SJun-ichiro itojun Hagino 			/* m_pulldown instead of copy? */
1306686cdd19SJun-ichiro itojun Hagino 			m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1307a1f7e5f8SHajimu UMEMOTO 			    subjlen, (caddr_t)&in6_subj);
1308a1f7e5f8SHajimu UMEMOTO 			if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
13099a4f9608SHajimu UMEMOTO 				goto bad;
13102a5aafceSHajimu UMEMOTO 
1311a1f7e5f8SHajimu UMEMOTO 			subj = (char *)&in6_subj;
1312a1f7e5f8SHajimu UMEMOTO 			if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1313686cdd19SJun-ichiro itojun Hagino 				break;
131433841545SHajimu UMEMOTO 
1315686cdd19SJun-ichiro itojun Hagino 			/*
1316686cdd19SJun-ichiro itojun Hagino 			 * XXX if we are to allow other cases, we should really
1317686cdd19SJun-ichiro itojun Hagino 			 * be careful about scope here.
1318686cdd19SJun-ichiro itojun Hagino 			 * basically, we should disallow queries toward IPv6
131906cd0a3fSHajimu UMEMOTO 			 * destination X with subject Y,
132006cd0a3fSHajimu UMEMOTO 			 * if scope(X) > scope(Y).
1321686cdd19SJun-ichiro itojun Hagino 			 * if we allow scope(X) > scope(Y), it will result in
1322686cdd19SJun-ichiro itojun Hagino 			 * information leakage across scope boundary.
1323686cdd19SJun-ichiro itojun Hagino 			 */
1324686cdd19SJun-ichiro itojun Hagino 			goto bad;
1325686cdd19SJun-ichiro itojun Hagino 
1326686cdd19SJun-ichiro itojun Hagino 		case ICMP6_NI_SUBJ_FQDN:
1327686cdd19SJun-ichiro itojun Hagino 			/*
1328686cdd19SJun-ichiro itojun Hagino 			 * Validate Subject name with gethostname(3).
1329686cdd19SJun-ichiro itojun Hagino 			 *
1330686cdd19SJun-ichiro itojun Hagino 			 * The behavior may need some debate, since:
1331686cdd19SJun-ichiro itojun Hagino 			 * - we are not sure if the node has FQDN as
1332686cdd19SJun-ichiro itojun Hagino 			 *   hostname (returned by gethostname(3)).
1333686cdd19SJun-ichiro itojun Hagino 			 * - the code does wildcard match for truncated names.
1334686cdd19SJun-ichiro itojun Hagino 			 *   however, we are not sure if we want to perform
1335686cdd19SJun-ichiro itojun Hagino 			 *   wildcard match, if gethostname(3) side has
1336686cdd19SJun-ichiro itojun Hagino 			 *   truncated hostname.
1337686cdd19SJun-ichiro itojun Hagino 			 */
133876ca6f88SJamie Gritton 			pr = curthread->td_ucred->cr_prison;
133976ca6f88SJamie Gritton 			mtx_lock(&pr->pr_mtx);
1340c1f19219SJamie Gritton 			n = ni6_nametodns(pr->pr_hostname,
1341c1f19219SJamie Gritton 			    strlen(pr->pr_hostname), 0);
134276ca6f88SJamie Gritton 			mtx_unlock(&pr->pr_mtx);
1343686cdd19SJun-ichiro itojun Hagino 			if (!n || n->m_next || n->m_len == 0)
1344686cdd19SJun-ichiro itojun Hagino 				goto bad;
1345686cdd19SJun-ichiro itojun Hagino 			IP6_EXTHDR_GET(subj, char *, m,
1346686cdd19SJun-ichiro itojun Hagino 			    off + sizeof(struct icmp6_nodeinfo), subjlen);
1347686cdd19SJun-ichiro itojun Hagino 			if (subj == NULL)
1348686cdd19SJun-ichiro itojun Hagino 				goto bad;
1349686cdd19SJun-ichiro itojun Hagino 			if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1350686cdd19SJun-ichiro itojun Hagino 			    n->m_len)) {
1351686cdd19SJun-ichiro itojun Hagino 				goto bad;
1352686cdd19SJun-ichiro itojun Hagino 			}
1353686cdd19SJun-ichiro itojun Hagino 			m_freem(n);
1354686cdd19SJun-ichiro itojun Hagino 			n = NULL;
1355686cdd19SJun-ichiro itojun Hagino 			break;
1356686cdd19SJun-ichiro itojun Hagino 
135733841545SHajimu UMEMOTO 		case ICMP6_NI_SUBJ_IPV4:	/* XXX: to be implemented? */
1358686cdd19SJun-ichiro itojun Hagino 		default:
1359686cdd19SJun-ichiro itojun Hagino 			goto bad;
1360686cdd19SJun-ichiro itojun Hagino 		}
1361686cdd19SJun-ichiro itojun Hagino 		break;
1362686cdd19SJun-ichiro itojun Hagino 	}
1363686cdd19SJun-ichiro itojun Hagino 
136433841545SHajimu UMEMOTO 	/* refuse based on configuration.  XXX ICMP6_NI_REFUSED? */
136533841545SHajimu UMEMOTO 	switch (qtype) {
136633841545SHajimu UMEMOTO 	case NI_QTYPE_FQDN:
1367603724d3SBjoern A. Zeeb 		if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
136833841545SHajimu UMEMOTO 			goto bad;
136933841545SHajimu UMEMOTO 		break;
137033841545SHajimu UMEMOTO 	case NI_QTYPE_NODEADDR:
1371a22adbc6SSUZUKI Shinsuke 	case NI_QTYPE_IPV4ADDR:
1372603724d3SBjoern A. Zeeb 		if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
137333841545SHajimu UMEMOTO 			goto bad;
137433841545SHajimu UMEMOTO 		break;
137533841545SHajimu UMEMOTO 	}
137633841545SHajimu UMEMOTO 
137733841545SHajimu UMEMOTO 	/* guess reply length */
137833841545SHajimu UMEMOTO 	switch (qtype) {
137933841545SHajimu UMEMOTO 	case NI_QTYPE_NOOP:
138033841545SHajimu UMEMOTO 		break;		/* no reply data */
138133841545SHajimu UMEMOTO 	case NI_QTYPE_SUPTYPES:
138233841545SHajimu UMEMOTO 		replylen += sizeof(u_int32_t);
138333841545SHajimu UMEMOTO 		break;
138433841545SHajimu UMEMOTO 	case NI_QTYPE_FQDN:
138533841545SHajimu UMEMOTO 		/* XXX will append an mbuf */
138633841545SHajimu UMEMOTO 		replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
138733841545SHajimu UMEMOTO 		break;
138833841545SHajimu UMEMOTO 	case NI_QTYPE_NODEADDR:
1389c66b5feaSHajimu UMEMOTO 		addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
139033841545SHajimu UMEMOTO 		if ((replylen += addrs * (sizeof(struct in6_addr) +
139133841545SHajimu UMEMOTO 		    sizeof(u_int32_t))) > MCLBYTES)
139233841545SHajimu UMEMOTO 			replylen = MCLBYTES; /* XXX: will truncate pkt later */
139333841545SHajimu UMEMOTO 		break;
1394a22adbc6SSUZUKI Shinsuke 	case NI_QTYPE_IPV4ADDR:
1395a22adbc6SSUZUKI Shinsuke 		/* unsupported - should respond with unknown Qtype? */
1396a22adbc6SSUZUKI Shinsuke 		break;
139733841545SHajimu UMEMOTO 	default:
139833841545SHajimu UMEMOTO 		/*
139933841545SHajimu UMEMOTO 		 * XXX: We must return a reply with the ICMP6 code
140033841545SHajimu UMEMOTO 		 * `unknown Qtype' in this case.  However we regard the case
140133841545SHajimu UMEMOTO 		 * as an FQDN query for backward compatibility.
140233841545SHajimu UMEMOTO 		 * Older versions set a random value to this field,
140333841545SHajimu UMEMOTO 		 * so it rarely varies in the defined qtypes.
140433841545SHajimu UMEMOTO 		 * But the mechanism is not reliable...
140533841545SHajimu UMEMOTO 		 * maybe we should obsolete older versions.
140633841545SHajimu UMEMOTO 		 */
140733841545SHajimu UMEMOTO 		qtype = NI_QTYPE_FQDN;
140833841545SHajimu UMEMOTO 		/* XXX will append an mbuf */
140933841545SHajimu UMEMOTO 		replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
141033841545SHajimu UMEMOTO 		oldfqdn++;
141133841545SHajimu UMEMOTO 		break;
141233841545SHajimu UMEMOTO 	}
141333841545SHajimu UMEMOTO 
141433841545SHajimu UMEMOTO 	/* allocate an mbuf to reply. */
1415a163d034SWarner Losh 	MGETHDR(n, M_DONTWAIT, m->m_type);
1416686cdd19SJun-ichiro itojun Hagino 	if (n == NULL) {
1417686cdd19SJun-ichiro itojun Hagino 		m_freem(m);
141882cd038dSYoshinobu Inoue 		return (NULL);
1419686cdd19SJun-ichiro itojun Hagino 	}
14209967cafcSSam Leffler 	M_MOVE_PKTHDR(n, m); /* just for recvif */
142182cd038dSYoshinobu Inoue 	if (replylen > MHLEN) {
1422686cdd19SJun-ichiro itojun Hagino 		if (replylen > MCLBYTES) {
142382cd038dSYoshinobu Inoue 			/*
142433841545SHajimu UMEMOTO 			 * XXX: should we try to allocate more? But MCLBYTES
142533841545SHajimu UMEMOTO 			 * is probably much larger than IPV6_MMTU...
142682cd038dSYoshinobu Inoue 			 */
142782cd038dSYoshinobu Inoue 			goto bad;
1428686cdd19SJun-ichiro itojun Hagino 		}
1429a163d034SWarner Losh 		MCLGET(n, M_DONTWAIT);
143082cd038dSYoshinobu Inoue 		if ((n->m_flags & M_EXT) == 0) {
143182cd038dSYoshinobu Inoue 			goto bad;
143282cd038dSYoshinobu Inoue 		}
143382cd038dSYoshinobu Inoue 	}
143482cd038dSYoshinobu Inoue 	n->m_pkthdr.len = n->m_len = replylen;
143582cd038dSYoshinobu Inoue 
143682cd038dSYoshinobu Inoue 	/* copy mbuf header and IPv6 + Node Information base headers */
143782cd038dSYoshinobu Inoue 	bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
143882cd038dSYoshinobu Inoue 	nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1439686cdd19SJun-ichiro itojun Hagino 	bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
144082cd038dSYoshinobu Inoue 
144182cd038dSYoshinobu Inoue 	/* qtype dependent procedure */
144282cd038dSYoshinobu Inoue 	switch (qtype) {
144382cd038dSYoshinobu Inoue 	case NI_QTYPE_NOOP:
144433841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
144582cd038dSYoshinobu Inoue 		nni6->ni_flags = 0;
144682cd038dSYoshinobu Inoue 		break;
144782cd038dSYoshinobu Inoue 	case NI_QTYPE_SUPTYPES:
144833841545SHajimu UMEMOTO 	{
144933841545SHajimu UMEMOTO 		u_int32_t v;
145033841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
145133841545SHajimu UMEMOTO 		nni6->ni_flags = htons(0x0000);	/* raw bitmap */
145233841545SHajimu UMEMOTO 		/* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
145333841545SHajimu UMEMOTO 		v = (u_int32_t)htonl(0x0000000f);
145433841545SHajimu UMEMOTO 		bcopy(&v, nni6 + 1, sizeof(u_int32_t));
145582cd038dSYoshinobu Inoue 		break;
145633841545SHajimu UMEMOTO 	}
145782cd038dSYoshinobu Inoue 	case NI_QTYPE_FQDN:
145833841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
145982cd038dSYoshinobu Inoue 		fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
146006cd0a3fSHajimu UMEMOTO 		    sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
146182cd038dSYoshinobu Inoue 		nni6->ni_flags = 0; /* XXX: meaningless TTL */
146282cd038dSYoshinobu Inoue 		fqdn->ni_fqdn_ttl = 0;	/* ditto. */
1463686cdd19SJun-ichiro itojun Hagino 		/*
146476ca6f88SJamie Gritton 		 * XXX do we really have FQDN in hostname?
1465686cdd19SJun-ichiro itojun Hagino 		 */
146676ca6f88SJamie Gritton 		pr = curthread->td_ucred->cr_prison;
146776ca6f88SJamie Gritton 		mtx_lock(&pr->pr_mtx);
1468c1f19219SJamie Gritton 		n->m_next = ni6_nametodns(pr->pr_hostname,
1469c1f19219SJamie Gritton 		    strlen(pr->pr_hostname), oldfqdn);
147076ca6f88SJamie Gritton 		mtx_unlock(&pr->pr_mtx);
1471686cdd19SJun-ichiro itojun Hagino 		if (n->m_next == NULL)
1472686cdd19SJun-ichiro itojun Hagino 			goto bad;
1473686cdd19SJun-ichiro itojun Hagino 		/* XXX we assume that n->m_next is not a chain */
1474686cdd19SJun-ichiro itojun Hagino 		if (n->m_next->m_next != NULL)
1475686cdd19SJun-ichiro itojun Hagino 			goto bad;
1476686cdd19SJun-ichiro itojun Hagino 		n->m_pkthdr.len += n->m_next->m_len;
147782cd038dSYoshinobu Inoue 		break;
147882cd038dSYoshinobu Inoue 	case NI_QTYPE_NODEADDR:
147982cd038dSYoshinobu Inoue 	{
148082cd038dSYoshinobu Inoue 		int lenlim, copied;
148182cd038dSYoshinobu Inoue 
148233841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
148333841545SHajimu UMEMOTO 		n->m_pkthdr.len = n->m_len =
148433841545SHajimu UMEMOTO 		    sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
148533841545SHajimu UMEMOTO 		lenlim = M_TRAILINGSPACE(n);
148682cd038dSYoshinobu Inoue 		copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
148782cd038dSYoshinobu Inoue 		/* XXX: reset mbuf length */
148882cd038dSYoshinobu Inoue 		n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
148982cd038dSYoshinobu Inoue 		    sizeof(struct icmp6_nodeinfo) + copied;
149082cd038dSYoshinobu Inoue 		break;
149182cd038dSYoshinobu Inoue 	}
149282cd038dSYoshinobu Inoue 	default:
149382cd038dSYoshinobu Inoue 		break;		/* XXX impossible! */
149482cd038dSYoshinobu Inoue 	}
149582cd038dSYoshinobu Inoue 
149682cd038dSYoshinobu Inoue 	nni6->ni_type = ICMP6_NI_REPLY;
1497686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
149882cd038dSYoshinobu Inoue 	return (n);
149982cd038dSYoshinobu Inoue 
150082cd038dSYoshinobu Inoue   bad:
1501686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
150282cd038dSYoshinobu Inoue 	if (n)
150382cd038dSYoshinobu Inoue 		m_freem(n);
150482cd038dSYoshinobu Inoue 	return (NULL);
150582cd038dSYoshinobu Inoue }
150682cd038dSYoshinobu Inoue 
150782cd038dSYoshinobu Inoue /*
1508686cdd19SJun-ichiro itojun Hagino  * make a mbuf with DNS-encoded string.  no compression support.
1509686cdd19SJun-ichiro itojun Hagino  *
1510686cdd19SJun-ichiro itojun Hagino  * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1511686cdd19SJun-ichiro itojun Hagino  * treated as truncated name (two \0 at the end).  this is a wild guess.
15121272577eSXin LI  *
15131272577eSXin LI  * old - return pascal string if non-zero
1514686cdd19SJun-ichiro itojun Hagino  */
1515686cdd19SJun-ichiro itojun Hagino static struct mbuf *
15161272577eSXin LI ni6_nametodns(const char *name, int namelen, int old)
1517686cdd19SJun-ichiro itojun Hagino {
1518686cdd19SJun-ichiro itojun Hagino 	struct mbuf *m;
1519686cdd19SJun-ichiro itojun Hagino 	char *cp, *ep;
1520686cdd19SJun-ichiro itojun Hagino 	const char *p, *q;
1521686cdd19SJun-ichiro itojun Hagino 	int i, len, nterm;
1522686cdd19SJun-ichiro itojun Hagino 
1523686cdd19SJun-ichiro itojun Hagino 	if (old)
1524686cdd19SJun-ichiro itojun Hagino 		len = namelen + 1;
1525686cdd19SJun-ichiro itojun Hagino 	else
1526686cdd19SJun-ichiro itojun Hagino 		len = MCLBYTES;
1527686cdd19SJun-ichiro itojun Hagino 
1528686cdd19SJun-ichiro itojun Hagino 	/* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1529a163d034SWarner Losh 	MGET(m, M_DONTWAIT, MT_DATA);
1530686cdd19SJun-ichiro itojun Hagino 	if (m && len > MLEN) {
1531a163d034SWarner Losh 		MCLGET(m, M_DONTWAIT);
1532686cdd19SJun-ichiro itojun Hagino 		if ((m->m_flags & M_EXT) == 0)
1533686cdd19SJun-ichiro itojun Hagino 			goto fail;
1534686cdd19SJun-ichiro itojun Hagino 	}
1535686cdd19SJun-ichiro itojun Hagino 	if (!m)
1536686cdd19SJun-ichiro itojun Hagino 		goto fail;
1537686cdd19SJun-ichiro itojun Hagino 	m->m_next = NULL;
1538686cdd19SJun-ichiro itojun Hagino 
1539686cdd19SJun-ichiro itojun Hagino 	if (old) {
1540686cdd19SJun-ichiro itojun Hagino 		m->m_len = len;
1541686cdd19SJun-ichiro itojun Hagino 		*mtod(m, char *) = namelen;
1542686cdd19SJun-ichiro itojun Hagino 		bcopy(name, mtod(m, char *) + 1, namelen);
1543686cdd19SJun-ichiro itojun Hagino 		return m;
1544686cdd19SJun-ichiro itojun Hagino 	} else {
1545686cdd19SJun-ichiro itojun Hagino 		m->m_len = 0;
1546686cdd19SJun-ichiro itojun Hagino 		cp = mtod(m, char *);
1547686cdd19SJun-ichiro itojun Hagino 		ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1548686cdd19SJun-ichiro itojun Hagino 
1549686cdd19SJun-ichiro itojun Hagino 		/* if not certain about my name, return empty buffer */
1550686cdd19SJun-ichiro itojun Hagino 		if (namelen == 0)
1551686cdd19SJun-ichiro itojun Hagino 			return m;
1552686cdd19SJun-ichiro itojun Hagino 
1553686cdd19SJun-ichiro itojun Hagino 		/*
1554686cdd19SJun-ichiro itojun Hagino 		 * guess if it looks like shortened hostname, or FQDN.
1555686cdd19SJun-ichiro itojun Hagino 		 * shortened hostname needs two trailing "\0".
1556686cdd19SJun-ichiro itojun Hagino 		 */
1557686cdd19SJun-ichiro itojun Hagino 		i = 0;
1558686cdd19SJun-ichiro itojun Hagino 		for (p = name; p < name + namelen; p++) {
1559686cdd19SJun-ichiro itojun Hagino 			if (*p && *p == '.')
1560686cdd19SJun-ichiro itojun Hagino 				i++;
1561686cdd19SJun-ichiro itojun Hagino 		}
1562686cdd19SJun-ichiro itojun Hagino 		if (i < 2)
1563686cdd19SJun-ichiro itojun Hagino 			nterm = 2;
1564686cdd19SJun-ichiro itojun Hagino 		else
1565686cdd19SJun-ichiro itojun Hagino 			nterm = 1;
1566686cdd19SJun-ichiro itojun Hagino 
1567686cdd19SJun-ichiro itojun Hagino 		p = name;
1568686cdd19SJun-ichiro itojun Hagino 		while (cp < ep && p < name + namelen) {
1569686cdd19SJun-ichiro itojun Hagino 			i = 0;
1570686cdd19SJun-ichiro itojun Hagino 			for (q = p; q < name + namelen && *q && *q != '.'; q++)
1571686cdd19SJun-ichiro itojun Hagino 				i++;
1572686cdd19SJun-ichiro itojun Hagino 			/* result does not fit into mbuf */
1573686cdd19SJun-ichiro itojun Hagino 			if (cp + i + 1 >= ep)
1574686cdd19SJun-ichiro itojun Hagino 				goto fail;
1575610be6ceSHajimu UMEMOTO 			/*
1576610be6ceSHajimu UMEMOTO 			 * DNS label length restriction, RFC1035 page 8.
1577610be6ceSHajimu UMEMOTO 			 * "i == 0" case is included here to avoid returning
1578610be6ceSHajimu UMEMOTO 			 * 0-length label on "foo..bar".
1579610be6ceSHajimu UMEMOTO 			 */
1580610be6ceSHajimu UMEMOTO 			if (i <= 0 || i >= 64)
1581686cdd19SJun-ichiro itojun Hagino 				goto fail;
1582686cdd19SJun-ichiro itojun Hagino 			*cp++ = i;
1583686cdd19SJun-ichiro itojun Hagino 			bcopy(p, cp, i);
1584686cdd19SJun-ichiro itojun Hagino 			cp += i;
1585686cdd19SJun-ichiro itojun Hagino 			p = q;
1586686cdd19SJun-ichiro itojun Hagino 			if (p < name + namelen && *p == '.')
1587686cdd19SJun-ichiro itojun Hagino 				p++;
1588686cdd19SJun-ichiro itojun Hagino 		}
1589686cdd19SJun-ichiro itojun Hagino 		/* termination */
1590686cdd19SJun-ichiro itojun Hagino 		if (cp + nterm >= ep)
1591686cdd19SJun-ichiro itojun Hagino 			goto fail;
1592686cdd19SJun-ichiro itojun Hagino 		while (nterm-- > 0)
1593686cdd19SJun-ichiro itojun Hagino 			*cp++ = '\0';
1594686cdd19SJun-ichiro itojun Hagino 		m->m_len = cp - mtod(m, char *);
1595686cdd19SJun-ichiro itojun Hagino 		return m;
1596686cdd19SJun-ichiro itojun Hagino 	}
1597686cdd19SJun-ichiro itojun Hagino 
1598686cdd19SJun-ichiro itojun Hagino 	panic("should not reach here");
1599686cdd19SJun-ichiro itojun Hagino 	/* NOTREACHED */
1600686cdd19SJun-ichiro itojun Hagino 
1601686cdd19SJun-ichiro itojun Hagino  fail:
1602686cdd19SJun-ichiro itojun Hagino 	if (m)
1603686cdd19SJun-ichiro itojun Hagino 		m_freem(m);
1604686cdd19SJun-ichiro itojun Hagino 	return NULL;
1605686cdd19SJun-ichiro itojun Hagino }
1606686cdd19SJun-ichiro itojun Hagino 
1607686cdd19SJun-ichiro itojun Hagino /*
1608686cdd19SJun-ichiro itojun Hagino  * check if two DNS-encoded string matches.  takes care of truncated
1609686cdd19SJun-ichiro itojun Hagino  * form (with \0\0 at the end).  no compression support.
161033841545SHajimu UMEMOTO  * XXX upper/lowercase match (see RFC2065)
1611686cdd19SJun-ichiro itojun Hagino  */
1612686cdd19SJun-ichiro itojun Hagino static int
16131272577eSXin LI ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1614686cdd19SJun-ichiro itojun Hagino {
1615686cdd19SJun-ichiro itojun Hagino 	const char *a0, *b0;
1616686cdd19SJun-ichiro itojun Hagino 	int l;
1617686cdd19SJun-ichiro itojun Hagino 
1618686cdd19SJun-ichiro itojun Hagino 	/* simplest case - need validation? */
1619686cdd19SJun-ichiro itojun Hagino 	if (alen == blen && bcmp(a, b, alen) == 0)
1620686cdd19SJun-ichiro itojun Hagino 		return 1;
1621686cdd19SJun-ichiro itojun Hagino 
1622686cdd19SJun-ichiro itojun Hagino 	a0 = a;
1623686cdd19SJun-ichiro itojun Hagino 	b0 = b;
1624686cdd19SJun-ichiro itojun Hagino 
1625686cdd19SJun-ichiro itojun Hagino 	/* termination is mandatory */
1626686cdd19SJun-ichiro itojun Hagino 	if (alen < 2 || blen < 2)
1627686cdd19SJun-ichiro itojun Hagino 		return 0;
1628686cdd19SJun-ichiro itojun Hagino 	if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1629686cdd19SJun-ichiro itojun Hagino 		return 0;
1630686cdd19SJun-ichiro itojun Hagino 	alen--;
1631686cdd19SJun-ichiro itojun Hagino 	blen--;
1632686cdd19SJun-ichiro itojun Hagino 
1633686cdd19SJun-ichiro itojun Hagino 	while (a - a0 < alen && b - b0 < blen) {
1634686cdd19SJun-ichiro itojun Hagino 		if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1635686cdd19SJun-ichiro itojun Hagino 			return 0;
1636686cdd19SJun-ichiro itojun Hagino 
1637686cdd19SJun-ichiro itojun Hagino 		if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1638686cdd19SJun-ichiro itojun Hagino 			return 0;
1639686cdd19SJun-ichiro itojun Hagino 		/* we don't support compression yet */
1640686cdd19SJun-ichiro itojun Hagino 		if (a[0] >= 64 || b[0] >= 64)
1641686cdd19SJun-ichiro itojun Hagino 			return 0;
1642686cdd19SJun-ichiro itojun Hagino 
1643686cdd19SJun-ichiro itojun Hagino 		/* truncated case */
1644686cdd19SJun-ichiro itojun Hagino 		if (a[0] == 0 && a - a0 == alen - 1)
1645686cdd19SJun-ichiro itojun Hagino 			return 1;
1646686cdd19SJun-ichiro itojun Hagino 		if (b[0] == 0 && b - b0 == blen - 1)
1647686cdd19SJun-ichiro itojun Hagino 			return 1;
1648686cdd19SJun-ichiro itojun Hagino 		if (a[0] == 0 || b[0] == 0)
1649686cdd19SJun-ichiro itojun Hagino 			return 0;
1650686cdd19SJun-ichiro itojun Hagino 
1651686cdd19SJun-ichiro itojun Hagino 		if (a[0] != b[0])
1652686cdd19SJun-ichiro itojun Hagino 			return 0;
1653686cdd19SJun-ichiro itojun Hagino 		l = a[0];
1654686cdd19SJun-ichiro itojun Hagino 		if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1655686cdd19SJun-ichiro itojun Hagino 			return 0;
1656686cdd19SJun-ichiro itojun Hagino 		if (bcmp(a + 1, b + 1, l) != 0)
1657686cdd19SJun-ichiro itojun Hagino 			return 0;
1658686cdd19SJun-ichiro itojun Hagino 
1659686cdd19SJun-ichiro itojun Hagino 		a += 1 + l;
1660686cdd19SJun-ichiro itojun Hagino 		b += 1 + l;
1661686cdd19SJun-ichiro itojun Hagino 	}
1662686cdd19SJun-ichiro itojun Hagino 
1663686cdd19SJun-ichiro itojun Hagino 	if (a - a0 == alen && b - b0 == blen)
1664686cdd19SJun-ichiro itojun Hagino 		return 1;
1665686cdd19SJun-ichiro itojun Hagino 	else
1666686cdd19SJun-ichiro itojun Hagino 		return 0;
1667686cdd19SJun-ichiro itojun Hagino }
1668686cdd19SJun-ichiro itojun Hagino 
1669686cdd19SJun-ichiro itojun Hagino /*
167082cd038dSYoshinobu Inoue  * calculate the number of addresses to be returned in the node info reply.
167182cd038dSYoshinobu Inoue  */
167282cd038dSYoshinobu Inoue static int
16731272577eSXin LI ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
16741272577eSXin LI     struct in6_addr *subj)
167582cd038dSYoshinobu Inoue {
16768b615593SMarko Zec 	INIT_VNET_NET(curvnet);
16778b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
167833841545SHajimu UMEMOTO 	struct ifnet *ifp;
167933841545SHajimu UMEMOTO 	struct in6_ifaddr *ifa6;
168033841545SHajimu UMEMOTO 	struct ifaddr *ifa;
168182cd038dSYoshinobu Inoue 	int addrs = 0, addrsofif, iffound = 0;
168233841545SHajimu UMEMOTO 	int niflags = ni6->ni_flags;
168333841545SHajimu UMEMOTO 
168433841545SHajimu UMEMOTO 	if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
168533841545SHajimu UMEMOTO 		switch (ni6->ni_code) {
168633841545SHajimu UMEMOTO 		case ICMP6_NI_SUBJ_IPV6:
168733841545SHajimu UMEMOTO 			if (subj == NULL) /* must be impossible... */
168833841545SHajimu UMEMOTO 				return (0);
168933841545SHajimu UMEMOTO 			break;
169033841545SHajimu UMEMOTO 		default:
169133841545SHajimu UMEMOTO 			/*
169233841545SHajimu UMEMOTO 			 * XXX: we only support IPv6 subject address for
169333841545SHajimu UMEMOTO 			 * this Qtype.
169433841545SHajimu UMEMOTO 			 */
169533841545SHajimu UMEMOTO 			return (0);
169633841545SHajimu UMEMOTO 		}
169733841545SHajimu UMEMOTO 	}
169882cd038dSYoshinobu Inoue 
1699b30a244cSJeffrey Hsu 	IFNET_RLOCK();
1700603724d3SBjoern A. Zeeb 	for (ifp = TAILQ_FIRST(&V_ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
170182cd038dSYoshinobu Inoue 		addrsofif = 0;
17021e1d603eSRobert Watson 		IF_ADDR_LOCK(ifp);
1703c4dd3fe1SRobert Watson 		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
170482cd038dSYoshinobu Inoue 			if (ifa->ifa_addr->sa_family != AF_INET6)
170582cd038dSYoshinobu Inoue 				continue;
170682cd038dSYoshinobu Inoue 			ifa6 = (struct in6_ifaddr *)ifa;
170782cd038dSYoshinobu Inoue 
170833841545SHajimu UMEMOTO 			if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1709c66b5feaSHajimu UMEMOTO 			    IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
171082cd038dSYoshinobu Inoue 				iffound = 1;
171182cd038dSYoshinobu Inoue 
1712686cdd19SJun-ichiro itojun Hagino 			/*
1713686cdd19SJun-ichiro itojun Hagino 			 * IPv4-mapped addresses can only be returned by a
1714686cdd19SJun-ichiro itojun Hagino 			 * Node Information proxy, since they represent
1715686cdd19SJun-ichiro itojun Hagino 			 * addresses of IPv4-only nodes, which perforce do
1716686cdd19SJun-ichiro itojun Hagino 			 * not implement this protocol.
171733841545SHajimu UMEMOTO 			 * [icmp-name-lookups-07, Section 5.4]
1718686cdd19SJun-ichiro itojun Hagino 			 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1719686cdd19SJun-ichiro itojun Hagino 			 * this function at this moment.
1720686cdd19SJun-ichiro itojun Hagino 			 */
1721686cdd19SJun-ichiro itojun Hagino 
172282cd038dSYoshinobu Inoue 			/* What do we have to do about ::1? */
172382cd038dSYoshinobu Inoue 			switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
172482cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_LINKLOCAL:
172533841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
172633841545SHajimu UMEMOTO 					continue;
172782cd038dSYoshinobu Inoue 				break;
172882cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_SITELOCAL:
172933841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
173033841545SHajimu UMEMOTO 					continue;
173182cd038dSYoshinobu Inoue 				break;
173282cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_GLOBAL:
173333841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
173433841545SHajimu UMEMOTO 					continue;
173582cd038dSYoshinobu Inoue 				break;
173682cd038dSYoshinobu Inoue 			default:
173782cd038dSYoshinobu Inoue 				continue;
173882cd038dSYoshinobu Inoue 			}
173933841545SHajimu UMEMOTO 
174033841545SHajimu UMEMOTO 			/*
174133841545SHajimu UMEMOTO 			 * check if anycast is okay.
174233841545SHajimu UMEMOTO 			 * XXX: just experimental.  not in the spec.
174333841545SHajimu UMEMOTO 			 */
174433841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
174533841545SHajimu UMEMOTO 			    (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
174633841545SHajimu UMEMOTO 				continue; /* we need only unicast addresses */
174733841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1748603724d3SBjoern A. Zeeb 			    (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
174933841545SHajimu UMEMOTO 				continue;
175033841545SHajimu UMEMOTO 			}
175133841545SHajimu UMEMOTO 			addrsofif++; /* count the address */
175282cd038dSYoshinobu Inoue 		}
17531e1d603eSRobert Watson 		IF_ADDR_UNLOCK(ifp);
175482cd038dSYoshinobu Inoue 		if (iffound) {
175582cd038dSYoshinobu Inoue 			*ifpp = ifp;
1756b30a244cSJeffrey Hsu 			IFNET_RUNLOCK();
175782cd038dSYoshinobu Inoue 			return (addrsofif);
175882cd038dSYoshinobu Inoue 		}
175982cd038dSYoshinobu Inoue 
176082cd038dSYoshinobu Inoue 		addrs += addrsofif;
176182cd038dSYoshinobu Inoue 	}
1762b30a244cSJeffrey Hsu 	IFNET_RUNLOCK();
176382cd038dSYoshinobu Inoue 
176482cd038dSYoshinobu Inoue 	return (addrs);
176582cd038dSYoshinobu Inoue }
176682cd038dSYoshinobu Inoue 
176782cd038dSYoshinobu Inoue static int
17681272577eSXin LI ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
17691272577eSXin LI     struct ifnet *ifp0, int resid)
177082cd038dSYoshinobu Inoue {
17718b615593SMarko Zec 	INIT_VNET_NET(curvnet);
17728b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
1773603724d3SBjoern A. Zeeb 	struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&V_ifnet);
177433841545SHajimu UMEMOTO 	struct in6_ifaddr *ifa6;
177533841545SHajimu UMEMOTO 	struct ifaddr *ifa;
177633841545SHajimu UMEMOTO 	struct ifnet *ifp_dep = NULL;
177733841545SHajimu UMEMOTO 	int copied = 0, allow_deprecated = 0;
177882cd038dSYoshinobu Inoue 	u_char *cp = (u_char *)(nni6 + 1);
177933841545SHajimu UMEMOTO 	int niflags = ni6->ni_flags;
178033841545SHajimu UMEMOTO 	u_int32_t ltime;
178182cd038dSYoshinobu Inoue 
178233841545SHajimu UMEMOTO 	if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
178382cd038dSYoshinobu Inoue 		return (0);	/* needless to copy */
178482cd038dSYoshinobu Inoue 
1785b30a244cSJeffrey Hsu 	IFNET_RLOCK();
178633841545SHajimu UMEMOTO   again:
17870527d333SHajimu UMEMOTO 
178806cd0a3fSHajimu UMEMOTO 	for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
17891e1d603eSRobert Watson 		IF_ADDR_LOCK(ifp);
1790c4dd3fe1SRobert Watson 		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
179182cd038dSYoshinobu Inoue 			if (ifa->ifa_addr->sa_family != AF_INET6)
179282cd038dSYoshinobu Inoue 				continue;
179382cd038dSYoshinobu Inoue 			ifa6 = (struct in6_ifaddr *)ifa;
179482cd038dSYoshinobu Inoue 
179533841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
179633841545SHajimu UMEMOTO 			    allow_deprecated == 0) {
179733841545SHajimu UMEMOTO 				/*
179833841545SHajimu UMEMOTO 				 * prefererred address should be put before
179933841545SHajimu UMEMOTO 				 * deprecated addresses.
180033841545SHajimu UMEMOTO 				 */
180133841545SHajimu UMEMOTO 
180233841545SHajimu UMEMOTO 				/* record the interface for later search */
180333841545SHajimu UMEMOTO 				if (ifp_dep == NULL)
180433841545SHajimu UMEMOTO 					ifp_dep = ifp;
180533841545SHajimu UMEMOTO 
180682cd038dSYoshinobu Inoue 				continue;
180706cd0a3fSHajimu UMEMOTO 			} else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
180833841545SHajimu UMEMOTO 			    allow_deprecated != 0)
180933841545SHajimu UMEMOTO 				continue; /* we now collect deprecated addrs */
181082cd038dSYoshinobu Inoue 
181182cd038dSYoshinobu Inoue 			/* What do we have to do about ::1? */
181282cd038dSYoshinobu Inoue 			switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
181382cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_LINKLOCAL:
181433841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
181533841545SHajimu UMEMOTO 					continue;
181682cd038dSYoshinobu Inoue 				break;
181782cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_SITELOCAL:
181833841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
181933841545SHajimu UMEMOTO 					continue;
182082cd038dSYoshinobu Inoue 				break;
182182cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_GLOBAL:
182233841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
182333841545SHajimu UMEMOTO 					continue;
182482cd038dSYoshinobu Inoue 				break;
182582cd038dSYoshinobu Inoue 			default:
182682cd038dSYoshinobu Inoue 				continue;
182782cd038dSYoshinobu Inoue 			}
182882cd038dSYoshinobu Inoue 
182933841545SHajimu UMEMOTO 			/*
183033841545SHajimu UMEMOTO 			 * check if anycast is okay.
183133841545SHajimu UMEMOTO 			 * XXX: just experimental.  not in the spec.
183233841545SHajimu UMEMOTO 			 */
183333841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
183433841545SHajimu UMEMOTO 			    (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
183533841545SHajimu UMEMOTO 				continue;
183633841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1837603724d3SBjoern A. Zeeb 			    (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
183833841545SHajimu UMEMOTO 				continue;
183933841545SHajimu UMEMOTO 			}
184033841545SHajimu UMEMOTO 
184133841545SHajimu UMEMOTO 			/* now we can copy the address */
184233841545SHajimu UMEMOTO 			if (resid < sizeof(struct in6_addr) +
184333841545SHajimu UMEMOTO 			    sizeof(u_int32_t)) {
18441e1d603eSRobert Watson 				IF_ADDR_UNLOCK(ifp);
184582cd038dSYoshinobu Inoue 				/*
184682cd038dSYoshinobu Inoue 				 * We give up much more copy.
184782cd038dSYoshinobu Inoue 				 * Set the truncate flag and return.
184882cd038dSYoshinobu Inoue 				 */
184906cd0a3fSHajimu UMEMOTO 				nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
1850b30a244cSJeffrey Hsu 				IFNET_RUNLOCK();
185182cd038dSYoshinobu Inoue 				return (copied);
185282cd038dSYoshinobu Inoue 			}
185333841545SHajimu UMEMOTO 
185433841545SHajimu UMEMOTO 			/*
185533841545SHajimu UMEMOTO 			 * Set the TTL of the address.
185633841545SHajimu UMEMOTO 			 * The TTL value should be one of the following
185733841545SHajimu UMEMOTO 			 * according to the specification:
185833841545SHajimu UMEMOTO 			 *
185933841545SHajimu UMEMOTO 			 * 1. The remaining lifetime of a DHCP lease on the
186033841545SHajimu UMEMOTO 			 *    address, or
186133841545SHajimu UMEMOTO 			 * 2. The remaining Valid Lifetime of a prefix from
186233841545SHajimu UMEMOTO 			 *    which the address was derived through Stateless
186333841545SHajimu UMEMOTO 			 *    Autoconfiguration.
186433841545SHajimu UMEMOTO 			 *
186533841545SHajimu UMEMOTO 			 * Note that we currently do not support stateful
186633841545SHajimu UMEMOTO 			 * address configuration by DHCPv6, so the former
186733841545SHajimu UMEMOTO 			 * case can't happen.
186833841545SHajimu UMEMOTO 			 */
186933841545SHajimu UMEMOTO 			if (ifa6->ia6_lifetime.ia6t_expire == 0)
187033841545SHajimu UMEMOTO 				ltime = ND6_INFINITE_LIFETIME;
187133841545SHajimu UMEMOTO 			else {
187233841545SHajimu UMEMOTO 				if (ifa6->ia6_lifetime.ia6t_expire >
187333841545SHajimu UMEMOTO 				    time_second)
187433841545SHajimu UMEMOTO 					ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
187533841545SHajimu UMEMOTO 				else
187633841545SHajimu UMEMOTO 					ltime = 0;
187733841545SHajimu UMEMOTO 			}
187833841545SHajimu UMEMOTO 
187933841545SHajimu UMEMOTO 			bcopy(&ltime, cp, sizeof(u_int32_t));
188033841545SHajimu UMEMOTO 			cp += sizeof(u_int32_t);
188133841545SHajimu UMEMOTO 
188233841545SHajimu UMEMOTO 			/* copy the address itself */
188382cd038dSYoshinobu Inoue 			bcopy(&ifa6->ia_addr.sin6_addr, cp,
188482cd038dSYoshinobu Inoue 			    sizeof(struct in6_addr));
18859a4f9608SHajimu UMEMOTO 			in6_clearscope((struct in6_addr *)cp); /* XXX */
188682cd038dSYoshinobu Inoue 			cp += sizeof(struct in6_addr);
188733841545SHajimu UMEMOTO 
188833841545SHajimu UMEMOTO 			resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
188906cd0a3fSHajimu UMEMOTO 			copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
189082cd038dSYoshinobu Inoue 		}
18911e1d603eSRobert Watson 		IF_ADDR_UNLOCK(ifp);
189282cd038dSYoshinobu Inoue 		if (ifp0)	/* we need search only on the specified IF */
189382cd038dSYoshinobu Inoue 			break;
189482cd038dSYoshinobu Inoue 	}
189582cd038dSYoshinobu Inoue 
189633841545SHajimu UMEMOTO 	if (allow_deprecated == 0 && ifp_dep != NULL) {
189733841545SHajimu UMEMOTO 		ifp = ifp_dep;
189833841545SHajimu UMEMOTO 		allow_deprecated = 1;
189933841545SHajimu UMEMOTO 
190033841545SHajimu UMEMOTO 		goto again;
190133841545SHajimu UMEMOTO 	}
190233841545SHajimu UMEMOTO 
1903b30a244cSJeffrey Hsu 	IFNET_RUNLOCK();
1904b30a244cSJeffrey Hsu 
190582cd038dSYoshinobu Inoue 	return (copied);
190682cd038dSYoshinobu Inoue }
190782cd038dSYoshinobu Inoue 
190882cd038dSYoshinobu Inoue /*
190982cd038dSYoshinobu Inoue  * XXX almost dup'ed code with rip6_input.
191082cd038dSYoshinobu Inoue  */
191182cd038dSYoshinobu Inoue static int
19121272577eSXin LI icmp6_rip6_input(struct mbuf **mp, int off)
191382cd038dSYoshinobu Inoue {
19148b615593SMarko Zec 	INIT_VNET_INET(curvnet);
19158b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
191682cd038dSYoshinobu Inoue 	struct mbuf *m = *mp;
191733841545SHajimu UMEMOTO 	struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1918fc384fa5SBjoern A. Zeeb 	struct inpcb *in6p;
1919fc384fa5SBjoern A. Zeeb 	struct inpcb *last = NULL;
19209a4f9608SHajimu UMEMOTO 	struct sockaddr_in6 fromsa;
192182cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6;
192282cd038dSYoshinobu Inoue 	struct mbuf *opts = NULL;
192382cd038dSYoshinobu Inoue 
1924686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
192582cd038dSYoshinobu Inoue 	/* this is assumed to be safe. */
192682cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1927686cdd19SJun-ichiro itojun Hagino #else
1928686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1929686cdd19SJun-ichiro itojun Hagino 	if (icmp6 == NULL) {
1930686cdd19SJun-ichiro itojun Hagino 		/* m is already reclaimed */
193106cd0a3fSHajimu UMEMOTO 		return (IPPROTO_DONE);
1932686cdd19SJun-ichiro itojun Hagino 	}
1933686cdd19SJun-ichiro itojun Hagino #endif
193482cd038dSYoshinobu Inoue 
1935a1f7e5f8SHajimu UMEMOTO 	/*
1936a1f7e5f8SHajimu UMEMOTO 	 * XXX: the address may have embedded scope zone ID, which should be
1937a1f7e5f8SHajimu UMEMOTO 	 * hidden from applications.
1938a1f7e5f8SHajimu UMEMOTO 	 */
19399a4f9608SHajimu UMEMOTO 	bzero(&fromsa, sizeof(fromsa));
19409a4f9608SHajimu UMEMOTO 	fromsa.sin6_family = AF_INET6;
1941a1f7e5f8SHajimu UMEMOTO 	fromsa.sin6_len = sizeof(struct sockaddr_in6);
1942a1f7e5f8SHajimu UMEMOTO 	fromsa.sin6_addr = ip6->ip6_src;
1943a1f7e5f8SHajimu UMEMOTO 	if (sa6_recoverscope(&fromsa)) {
1944a1f7e5f8SHajimu UMEMOTO 		m_freem(m);
1945a1f7e5f8SHajimu UMEMOTO 		return (IPPROTO_DONE);
1946a1f7e5f8SHajimu UMEMOTO 	}
194782cd038dSYoshinobu Inoue 
1948603724d3SBjoern A. Zeeb 	INP_INFO_RLOCK(&V_ripcbinfo);
1949603724d3SBjoern A. Zeeb 	LIST_FOREACH(in6p, &V_ripcb, inp_list) {
1950b11e21aeSAlexander Motin 		if ((in6p->inp_vflag & INP_IPV6) == 0)
195182cd038dSYoshinobu Inoue 			continue;
1952fc384fa5SBjoern A. Zeeb 		if (in6p->inp_ip_p != IPPROTO_ICMPV6)
1953b11e21aeSAlexander Motin 			continue;
195482cd038dSYoshinobu Inoue 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
195582cd038dSYoshinobu Inoue 		   !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1956b11e21aeSAlexander Motin 			continue;
195782cd038dSYoshinobu Inoue 		if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
195882cd038dSYoshinobu Inoue 		   !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1959b11e21aeSAlexander Motin 			continue;
19606c5bbf5cSAlexander Motin 		INP_RLOCK(in6p);
19612f1ff0cdSRobert Watson 		if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
19626c5bbf5cSAlexander Motin 		    in6p->in6p_icmp6filt)) {
19636c5bbf5cSAlexander Motin 			INP_RUNLOCK(in6p);
1964b11e21aeSAlexander Motin 			continue;
19656c5bbf5cSAlexander Motin 		}
1966aba53ef0SKip Macy 		if (last != NULL) {
1967657db3c8SHajimu UMEMOTO 			struct	mbuf *n = NULL;
1968657db3c8SHajimu UMEMOTO 
1969657db3c8SHajimu UMEMOTO 			/*
1970657db3c8SHajimu UMEMOTO 			 * Recent network drivers tend to allocate a single
1971657db3c8SHajimu UMEMOTO 			 * mbuf cluster, rather than to make a couple of
1972657db3c8SHajimu UMEMOTO 			 * mbufs without clusters.  Also, since the IPv6 code
1973657db3c8SHajimu UMEMOTO 			 * path tries to avoid m_pullup(), it is highly
1974657db3c8SHajimu UMEMOTO 			 * probable that we still have an mbuf cluster here
1975657db3c8SHajimu UMEMOTO 			 * even though the necessary length can be stored in an
1976657db3c8SHajimu UMEMOTO 			 * mbuf's internal buffer.
1977657db3c8SHajimu UMEMOTO 			 * Meanwhile, the default size of the receive socket
1978657db3c8SHajimu UMEMOTO 			 * buffer for raw sockets is not so large.  This means
1979657db3c8SHajimu UMEMOTO 			 * the possibility of packet loss is relatively higher
1980657db3c8SHajimu UMEMOTO 			 * than before.  To avoid this scenario, we copy the
1981657db3c8SHajimu UMEMOTO 			 * received data to a separate mbuf that does not use
1982657db3c8SHajimu UMEMOTO 			 * a cluster, if possible.
1983657db3c8SHajimu UMEMOTO 			 * XXX: it is better to copy the data after stripping
1984657db3c8SHajimu UMEMOTO 			 * intermediate headers.
1985657db3c8SHajimu UMEMOTO 			 */
1986657db3c8SHajimu UMEMOTO 			if ((m->m_flags & M_EXT) && m->m_next == NULL &&
1987657db3c8SHajimu UMEMOTO 			    m->m_len <= MHLEN) {
1988657db3c8SHajimu UMEMOTO 				MGET(n, M_DONTWAIT, m->m_type);
1989657db3c8SHajimu UMEMOTO 				if (n != NULL) {
1990c543ec4eSGeorge V. Neville-Neil 					if (m_dup_pkthdr(n, m, M_NOWAIT)) {
1991c543ec4eSGeorge V. Neville-Neil 						bcopy(m->m_data, n->m_data,
1992c543ec4eSGeorge V. Neville-Neil 						      m->m_len);
1993657db3c8SHajimu UMEMOTO 						n->m_len = m->m_len;
1994c543ec4eSGeorge V. Neville-Neil 					} else {
1995c543ec4eSGeorge V. Neville-Neil 						m_free(n);
1996c543ec4eSGeorge V. Neville-Neil 						n = NULL;
1997c543ec4eSGeorge V. Neville-Neil 					}
1998657db3c8SHajimu UMEMOTO 				}
1999657db3c8SHajimu UMEMOTO 			}
2000657db3c8SHajimu UMEMOTO 			if (n != NULL ||
2001657db3c8SHajimu UMEMOTO 			    (n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
200297590249SBjoern A. Zeeb 				if (last->inp_flags & INP_CONTROLOPTS)
200311de19f4SHajimu UMEMOTO 					ip6_savecontrol(last, n, &opts);
200482cd038dSYoshinobu Inoue 				/* strip intermediate headers */
200582cd038dSYoshinobu Inoue 				m_adj(n, off);
2006fc384fa5SBjoern A. Zeeb 				SOCKBUF_LOCK(&last->inp_socket->so_rcv);
2007c9db0fadSRobert Watson 				if (sbappendaddr_locked(
2008fc384fa5SBjoern A. Zeeb 				    &last->inp_socket->so_rcv,
20099a4f9608SHajimu UMEMOTO 				    (struct sockaddr *)&fromsa, n, opts)
201006cd0a3fSHajimu UMEMOTO 				    == 0) {
201182cd038dSYoshinobu Inoue 					/* should notify about lost packet */
201282cd038dSYoshinobu Inoue 					m_freem(n);
201333841545SHajimu UMEMOTO 					if (opts) {
201482cd038dSYoshinobu Inoue 						m_freem(opts);
201533841545SHajimu UMEMOTO 					}
2016c9db0fadSRobert Watson 					SOCKBUF_UNLOCK(
2017fc384fa5SBjoern A. Zeeb 					    &last->inp_socket->so_rcv);
20184cc20ab1SSeigo Tanimura 				} else
2019fc384fa5SBjoern A. Zeeb 					sorwakeup_locked(last->inp_socket);
202082cd038dSYoshinobu Inoue 				opts = NULL;
202182cd038dSYoshinobu Inoue 			}
2022bb145f60SRobert Watson 			INP_RUNLOCK(last);
202382cd038dSYoshinobu Inoue 		}
202482cd038dSYoshinobu Inoue 		last = in6p;
202582cd038dSYoshinobu Inoue 	}
2026603724d3SBjoern A. Zeeb 	INP_INFO_RUNLOCK(&V_ripcbinfo);
2027aba53ef0SKip Macy 	if (last != NULL) {
202897590249SBjoern A. Zeeb 		if (last->inp_flags & INP_CONTROLOPTS)
202911de19f4SHajimu UMEMOTO 			ip6_savecontrol(last, m, &opts);
203082cd038dSYoshinobu Inoue 		/* strip intermediate headers */
203182cd038dSYoshinobu Inoue 		m_adj(m, off);
2032657db3c8SHajimu UMEMOTO 
2033657db3c8SHajimu UMEMOTO 		/* avoid using mbuf clusters if possible (see above) */
2034657db3c8SHajimu UMEMOTO 		if ((m->m_flags & M_EXT) && m->m_next == NULL &&
2035657db3c8SHajimu UMEMOTO 		    m->m_len <= MHLEN) {
2036657db3c8SHajimu UMEMOTO 			struct mbuf *n;
2037657db3c8SHajimu UMEMOTO 
2038657db3c8SHajimu UMEMOTO 			MGET(n, M_DONTWAIT, m->m_type);
2039657db3c8SHajimu UMEMOTO 			if (n != NULL) {
2040c543ec4eSGeorge V. Neville-Neil 				if (m_dup_pkthdr(n, m, M_NOWAIT)) {
2041657db3c8SHajimu UMEMOTO 					bcopy(m->m_data, n->m_data, m->m_len);
2042657db3c8SHajimu UMEMOTO 					n->m_len = m->m_len;
2043657db3c8SHajimu UMEMOTO 
2044657db3c8SHajimu UMEMOTO 					m_freem(m);
2045657db3c8SHajimu UMEMOTO 					m = n;
2046c543ec4eSGeorge V. Neville-Neil 				} else {
2047c543ec4eSGeorge V. Neville-Neil 					m_freem(n);
2048c543ec4eSGeorge V. Neville-Neil 					n = NULL;
2049c543ec4eSGeorge V. Neville-Neil 				}
2050657db3c8SHajimu UMEMOTO 			}
2051657db3c8SHajimu UMEMOTO 		}
2052fc384fa5SBjoern A. Zeeb 		SOCKBUF_LOCK(&last->inp_socket->so_rcv);
2053fc384fa5SBjoern A. Zeeb 		if (sbappendaddr_locked(&last->inp_socket->so_rcv,
20549a4f9608SHajimu UMEMOTO 		    (struct sockaddr *)&fromsa, m, opts) == 0) {
205582cd038dSYoshinobu Inoue 			m_freem(m);
205682cd038dSYoshinobu Inoue 			if (opts)
205782cd038dSYoshinobu Inoue 				m_freem(opts);
2058fc384fa5SBjoern A. Zeeb 			SOCKBUF_UNLOCK(&last->inp_socket->so_rcv);
20594cc20ab1SSeigo Tanimura 		} else
2060fc384fa5SBjoern A. Zeeb 			sorwakeup_locked(last->inp_socket);
2061bb145f60SRobert Watson 		INP_RUNLOCK(last);
206282cd038dSYoshinobu Inoue 	} else {
206382cd038dSYoshinobu Inoue 		m_freem(m);
206433cde130SBruce M Simpson 		IP6STAT_DEC(ip6s_delivered);
206582cd038dSYoshinobu Inoue 	}
206682cd038dSYoshinobu Inoue 	return IPPROTO_DONE;
206782cd038dSYoshinobu Inoue }
206882cd038dSYoshinobu Inoue 
206982cd038dSYoshinobu Inoue /*
207082cd038dSYoshinobu Inoue  * Reflect the ip6 packet back to the source.
2071686cdd19SJun-ichiro itojun Hagino  * OFF points to the icmp6 header, counted from the top of the mbuf.
207282cd038dSYoshinobu Inoue  */
207382cd038dSYoshinobu Inoue void
20741272577eSXin LI icmp6_reflect(struct mbuf *m, size_t off)
207582cd038dSYoshinobu Inoue {
20768b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
2077686cdd19SJun-ichiro itojun Hagino 	struct ip6_hdr *ip6;
207882cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6;
20798c0fec80SRobert Watson 	struct in6_ifaddr *ia = NULL;
2080686cdd19SJun-ichiro itojun Hagino 	int plen;
208182cd038dSYoshinobu Inoue 	int type, code;
208282cd038dSYoshinobu Inoue 	struct ifnet *outif = NULL;
2083a1f7e5f8SHajimu UMEMOTO 	struct in6_addr origdst, *src = NULL;
208482cd038dSYoshinobu Inoue 
2085686cdd19SJun-ichiro itojun Hagino 	/* too short to reflect */
2086686cdd19SJun-ichiro itojun Hagino 	if (off < sizeof(struct ip6_hdr)) {
208733841545SHajimu UMEMOTO 		nd6log((LOG_DEBUG,
208833841545SHajimu UMEMOTO 		    "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2089686cdd19SJun-ichiro itojun Hagino 		    (u_long)off, (u_long)sizeof(struct ip6_hdr),
209033841545SHajimu UMEMOTO 		    __FILE__, __LINE__));
2091686cdd19SJun-ichiro itojun Hagino 		goto bad;
2092686cdd19SJun-ichiro itojun Hagino 	}
2093686cdd19SJun-ichiro itojun Hagino 
209482cd038dSYoshinobu Inoue 	/*
209582cd038dSYoshinobu Inoue 	 * If there are extra headers between IPv6 and ICMPv6, strip
209682cd038dSYoshinobu Inoue 	 * off that header first.
209782cd038dSYoshinobu Inoue 	 */
2098686cdd19SJun-ichiro itojun Hagino #ifdef DIAGNOSTIC
2099686cdd19SJun-ichiro itojun Hagino 	if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2100686cdd19SJun-ichiro itojun Hagino 		panic("assumption failed in icmp6_reflect");
2101686cdd19SJun-ichiro itojun Hagino #endif
2102686cdd19SJun-ichiro itojun Hagino 	if (off > sizeof(struct ip6_hdr)) {
2103686cdd19SJun-ichiro itojun Hagino 		size_t l;
2104686cdd19SJun-ichiro itojun Hagino 		struct ip6_hdr nip6;
210582cd038dSYoshinobu Inoue 
2106686cdd19SJun-ichiro itojun Hagino 		l = off - sizeof(struct ip6_hdr);
2107686cdd19SJun-ichiro itojun Hagino 		m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2108686cdd19SJun-ichiro itojun Hagino 		m_adj(m, l);
2109686cdd19SJun-ichiro itojun Hagino 		l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2110686cdd19SJun-ichiro itojun Hagino 		if (m->m_len < l) {
2111686cdd19SJun-ichiro itojun Hagino 			if ((m = m_pullup(m, l)) == NULL)
2112686cdd19SJun-ichiro itojun Hagino 				return;
211382cd038dSYoshinobu Inoue 		}
2114686cdd19SJun-ichiro itojun Hagino 		bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2115686cdd19SJun-ichiro itojun Hagino 	} else /* off == sizeof(struct ip6_hdr) */ {
2116686cdd19SJun-ichiro itojun Hagino 		size_t l;
2117686cdd19SJun-ichiro itojun Hagino 		l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2118686cdd19SJun-ichiro itojun Hagino 		if (m->m_len < l) {
2119686cdd19SJun-ichiro itojun Hagino 			if ((m = m_pullup(m, l)) == NULL)
2120686cdd19SJun-ichiro itojun Hagino 				return;
212182cd038dSYoshinobu Inoue 		}
2122686cdd19SJun-ichiro itojun Hagino 	}
2123686cdd19SJun-ichiro itojun Hagino 	plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
212482cd038dSYoshinobu Inoue 	ip6 = mtod(m, struct ip6_hdr *);
212582cd038dSYoshinobu Inoue 	ip6->ip6_nxt = IPPROTO_ICMPV6;
212682cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)(ip6 + 1);
212782cd038dSYoshinobu Inoue 	type = icmp6->icmp6_type; /* keep type for statistics */
212882cd038dSYoshinobu Inoue 	code = icmp6->icmp6_code; /* ditto. */
212982cd038dSYoshinobu Inoue 
2130a1f7e5f8SHajimu UMEMOTO 	origdst = ip6->ip6_dst;
213182cd038dSYoshinobu Inoue 	/*
213282cd038dSYoshinobu Inoue 	 * ip6_input() drops a packet if its src is multicast.
213382cd038dSYoshinobu Inoue 	 * So, the src is never multicast.
213482cd038dSYoshinobu Inoue 	 */
213582cd038dSYoshinobu Inoue 	ip6->ip6_dst = ip6->ip6_src;
213682cd038dSYoshinobu Inoue 
213782cd038dSYoshinobu Inoue 	/*
213882cd038dSYoshinobu Inoue 	 * If the incoming packet was addressed directly to us (i.e. unicast),
213982cd038dSYoshinobu Inoue 	 * use dst as the src for the reply.
214006cd0a3fSHajimu UMEMOTO 	 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2141686cdd19SJun-ichiro itojun Hagino 	 * (for example) when we encounter an error while forwarding procedure
2142686cdd19SJun-ichiro itojun Hagino 	 * destined to a duplicated address of ours.
2143a1f7e5f8SHajimu UMEMOTO 	 * Note that ip6_getdstifaddr() may fail if we are in an error handling
2144a1f7e5f8SHajimu UMEMOTO 	 * procedure of an outgoing packet of our own, in which case we need
2145a1f7e5f8SHajimu UMEMOTO 	 * to search in the ifaddr list.
214682cd038dSYoshinobu Inoue 	 */
2147a1f7e5f8SHajimu UMEMOTO 	if (!IN6_IS_ADDR_MULTICAST(&origdst)) {
2148a1f7e5f8SHajimu UMEMOTO 		if ((ia = ip6_getdstifaddr(m))) {
2149a1f7e5f8SHajimu UMEMOTO 			if (!(ia->ia6_flags &
2150a1f7e5f8SHajimu UMEMOTO 			    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)))
2151a1f7e5f8SHajimu UMEMOTO 				src = &ia->ia_addr.sin6_addr;
2152a1f7e5f8SHajimu UMEMOTO 		} else {
2153a1f7e5f8SHajimu UMEMOTO 			struct sockaddr_in6 d;
2154a1f7e5f8SHajimu UMEMOTO 
2155a1f7e5f8SHajimu UMEMOTO 			bzero(&d, sizeof(d));
2156a1f7e5f8SHajimu UMEMOTO 			d.sin6_family = AF_INET6;
2157a1f7e5f8SHajimu UMEMOTO 			d.sin6_len = sizeof(d);
2158a1f7e5f8SHajimu UMEMOTO 			d.sin6_addr = origdst;
2159a1f7e5f8SHajimu UMEMOTO 			ia = (struct in6_ifaddr *)
2160a1f7e5f8SHajimu UMEMOTO 			    ifa_ifwithaddr((struct sockaddr *)&d);
2161a1f7e5f8SHajimu UMEMOTO 			if (ia &&
2162a1f7e5f8SHajimu UMEMOTO 			    !(ia->ia6_flags &
2163a1f7e5f8SHajimu UMEMOTO 			    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
2164a1f7e5f8SHajimu UMEMOTO 				src = &ia->ia_addr.sin6_addr;
216582cd038dSYoshinobu Inoue 			}
2166a1f7e5f8SHajimu UMEMOTO 		}
216782cd038dSYoshinobu Inoue 	}
216882cd038dSYoshinobu Inoue 
2169a1f7e5f8SHajimu UMEMOTO 	if (src == NULL) {
217033841545SHajimu UMEMOTO 		int e;
2171a1f7e5f8SHajimu UMEMOTO 		struct sockaddr_in6 sin6;
217233841545SHajimu UMEMOTO 		struct route_in6 ro;
217333841545SHajimu UMEMOTO 
217482cd038dSYoshinobu Inoue 		/*
2175686cdd19SJun-ichiro itojun Hagino 		 * This case matches to multicasts, our anycast, or unicasts
217633841545SHajimu UMEMOTO 		 * that we do not own.  Select a source address based on the
217733841545SHajimu UMEMOTO 		 * source address of the erroneous packet.
217882cd038dSYoshinobu Inoue 		 */
2179a1f7e5f8SHajimu UMEMOTO 		bzero(&sin6, sizeof(sin6));
2180a1f7e5f8SHajimu UMEMOTO 		sin6.sin6_family = AF_INET6;
2181a1f7e5f8SHajimu UMEMOTO 		sin6.sin6_len = sizeof(sin6);
2182a1f7e5f8SHajimu UMEMOTO 		sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */
2183a1f7e5f8SHajimu UMEMOTO 
218433841545SHajimu UMEMOTO 		bzero(&ro, sizeof(ro));
2185a1f7e5f8SHajimu UMEMOTO 		src = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, &outif, &e);
218633841545SHajimu UMEMOTO 		if (ro.ro_rt)
218733841545SHajimu UMEMOTO 			RTFREE(ro.ro_rt); /* XXX: we could use this */
218833841545SHajimu UMEMOTO 		if (src == NULL) {
21891d54aa3bSBjoern A. Zeeb 			char ip6buf[INET6_ADDRSTRLEN];
219033841545SHajimu UMEMOTO 			nd6log((LOG_DEBUG,
219133841545SHajimu UMEMOTO 			    "icmp6_reflect: source can't be determined: "
219233841545SHajimu UMEMOTO 			    "dst=%s, error=%d\n",
21931d54aa3bSBjoern A. Zeeb 			    ip6_sprintf(ip6buf, &sin6.sin6_addr), e));
219482cd038dSYoshinobu Inoue 			goto bad;
219533841545SHajimu UMEMOTO 		}
219633841545SHajimu UMEMOTO 	}
219782cd038dSYoshinobu Inoue 
219882cd038dSYoshinobu Inoue 	ip6->ip6_src = *src;
219982cd038dSYoshinobu Inoue 	ip6->ip6_flow = 0;
2200686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2201686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc |= IPV6_VERSION;
220282cd038dSYoshinobu Inoue 	ip6->ip6_nxt = IPPROTO_ICMPV6;
2203f95d4633SHajimu UMEMOTO 	if (outif)
2204f95d4633SHajimu UMEMOTO 		ip6->ip6_hlim = ND_IFINFO(outif)->chlim;
2205f95d4633SHajimu UMEMOTO 	else if (m->m_pkthdr.rcvif) {
220682cd038dSYoshinobu Inoue 		/* XXX: This may not be the outgoing interface */
220731b1bfe1SHajimu UMEMOTO 		ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
220833841545SHajimu UMEMOTO 	} else
2209603724d3SBjoern A. Zeeb 		ip6->ip6_hlim = V_ip6_defhlim;
221082cd038dSYoshinobu Inoue 
221182cd038dSYoshinobu Inoue 	icmp6->icmp6_cksum = 0;
221282cd038dSYoshinobu Inoue 	icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
221382cd038dSYoshinobu Inoue 	    sizeof(struct ip6_hdr), plen);
221482cd038dSYoshinobu Inoue 
221582cd038dSYoshinobu Inoue 	/*
221633841545SHajimu UMEMOTO 	 * XXX option handling
221782cd038dSYoshinobu Inoue 	 */
221882cd038dSYoshinobu Inoue 
221982cd038dSYoshinobu Inoue 	m->m_flags &= ~(M_BCAST|M_MCAST);
222082cd038dSYoshinobu Inoue 
22215d846453SSam Leffler 	ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
222282cd038dSYoshinobu Inoue 	if (outif)
222382cd038dSYoshinobu Inoue 		icmp6_ifoutstat_inc(outif, type, code);
222482cd038dSYoshinobu Inoue 
22258c0fec80SRobert Watson 	if (ia != NULL)
22268c0fec80SRobert Watson 		ifa_free(&ia->ia_ifa);
222782cd038dSYoshinobu Inoue 	return;
222882cd038dSYoshinobu Inoue 
222982cd038dSYoshinobu Inoue  bad:
22308c0fec80SRobert Watson 	if (ia != NULL)
22318c0fec80SRobert Watson 		ifa_free(&ia->ia_ifa);
223282cd038dSYoshinobu Inoue 	m_freem(m);
223382cd038dSYoshinobu Inoue 	return;
223482cd038dSYoshinobu Inoue }
223582cd038dSYoshinobu Inoue 
223682cd038dSYoshinobu Inoue void
22371272577eSXin LI icmp6_fasttimo(void)
223882cd038dSYoshinobu Inoue {
2239686cdd19SJun-ichiro itojun Hagino 
224033cde130SBruce M Simpson 	mld_fasttimo();
224133cde130SBruce M Simpson }
224233cde130SBruce M Simpson 
224333cde130SBruce M Simpson void
224433cde130SBruce M Simpson icmp6_slowtimo(void)
224533cde130SBruce M Simpson {
224633cde130SBruce M Simpson 
224733cde130SBruce M Simpson 	mld_slowtimo();
224882cd038dSYoshinobu Inoue }
224982cd038dSYoshinobu Inoue 
225082cd038dSYoshinobu Inoue static const char *
22511272577eSXin LI icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
22521272577eSXin LI     struct in6_addr *tgt6)
225382cd038dSYoshinobu Inoue {
225482cd038dSYoshinobu Inoue 	static char buf[1024];
22551d54aa3bSBjoern A. Zeeb 	char ip6bufs[INET6_ADDRSTRLEN];
22561d54aa3bSBjoern A. Zeeb 	char ip6bufd[INET6_ADDRSTRLEN];
22571d54aa3bSBjoern A. Zeeb 	char ip6buft[INET6_ADDRSTRLEN];
225882cd038dSYoshinobu Inoue 	snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
22591d54aa3bSBjoern A. Zeeb 	    ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
22601d54aa3bSBjoern A. Zeeb 	    ip6_sprintf(ip6buft, tgt6));
226182cd038dSYoshinobu Inoue 	return buf;
226282cd038dSYoshinobu Inoue }
226382cd038dSYoshinobu Inoue 
226482cd038dSYoshinobu Inoue void
22651272577eSXin LI icmp6_redirect_input(struct mbuf *m, int off)
226682cd038dSYoshinobu Inoue {
22678b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
22682cb64cb2SGeorge V. Neville-Neil 	struct ifnet *ifp;
226982cd038dSYoshinobu Inoue 	struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2270686cdd19SJun-ichiro itojun Hagino 	struct nd_redirect *nd_rd;
227182cd038dSYoshinobu Inoue 	int icmp6len = ntohs(ip6->ip6_plen);
227282cd038dSYoshinobu Inoue 	char *lladdr = NULL;
227382cd038dSYoshinobu Inoue 	int lladdrlen = 0;
227482cd038dSYoshinobu Inoue 	u_char *redirhdr = NULL;
227582cd038dSYoshinobu Inoue 	int redirhdrlen = 0;
227682cd038dSYoshinobu Inoue 	struct rtentry *rt = NULL;
227782cd038dSYoshinobu Inoue 	int is_router;
227882cd038dSYoshinobu Inoue 	int is_onlink;
227982cd038dSYoshinobu Inoue 	struct in6_addr src6 = ip6->ip6_src;
2280686cdd19SJun-ichiro itojun Hagino 	struct in6_addr redtgt6;
2281686cdd19SJun-ichiro itojun Hagino 	struct in6_addr reddst6;
228282cd038dSYoshinobu Inoue 	union nd_opts ndopts;
22831d54aa3bSBjoern A. Zeeb 	char ip6buf[INET6_ADDRSTRLEN];
228482cd038dSYoshinobu Inoue 
22852cb64cb2SGeorge V. Neville-Neil 	if (!m)
22862cb64cb2SGeorge V. Neville-Neil 		return;
22872cb64cb2SGeorge V. Neville-Neil 
22882cb64cb2SGeorge V. Neville-Neil 	ifp = m->m_pkthdr.rcvif;
22892cb64cb2SGeorge V. Neville-Neil 
22902cb64cb2SGeorge V. Neville-Neil 	if (!ifp)
229182cd038dSYoshinobu Inoue 		return;
229282cd038dSYoshinobu Inoue 
229382cd038dSYoshinobu Inoue 	/* XXX if we are router, we don't update route by icmp6 redirect */
2294603724d3SBjoern A. Zeeb 	if (V_ip6_forwarding)
2295686cdd19SJun-ichiro itojun Hagino 		goto freeit;
2296603724d3SBjoern A. Zeeb 	if (!V_icmp6_rediraccept)
2297686cdd19SJun-ichiro itojun Hagino 		goto freeit;
2298686cdd19SJun-ichiro itojun Hagino 
2299686cdd19SJun-ichiro itojun Hagino #ifndef PULLDOWN_TEST
2300686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_CHECK(m, off, icmp6len,);
2301686cdd19SJun-ichiro itojun Hagino 	nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2302686cdd19SJun-ichiro itojun Hagino #else
2303686cdd19SJun-ichiro itojun Hagino 	IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2304686cdd19SJun-ichiro itojun Hagino 	if (nd_rd == NULL) {
2305e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
230682cd038dSYoshinobu Inoue 		return;
2307686cdd19SJun-ichiro itojun Hagino 	}
2308686cdd19SJun-ichiro itojun Hagino #endif
2309686cdd19SJun-ichiro itojun Hagino 	redtgt6 = nd_rd->nd_rd_target;
2310686cdd19SJun-ichiro itojun Hagino 	reddst6 = nd_rd->nd_rd_dst;
231182cd038dSYoshinobu Inoue 
2312a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
2313a1f7e5f8SHajimu UMEMOTO 	    in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
2314a1f7e5f8SHajimu UMEMOTO 		goto freeit;
2315a1f7e5f8SHajimu UMEMOTO 	}
231682cd038dSYoshinobu Inoue 
231782cd038dSYoshinobu Inoue 	/* validation */
231882cd038dSYoshinobu Inoue 	if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
231933841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
232082cd038dSYoshinobu Inoue 		    "ICMP6 redirect sent from %s rejected; "
232106cd0a3fSHajimu UMEMOTO 		    "must be from linklocal\n",
23221d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6buf, &src6)));
232333841545SHajimu UMEMOTO 		goto bad;
232482cd038dSYoshinobu Inoue 	}
232582cd038dSYoshinobu Inoue 	if (ip6->ip6_hlim != 255) {
232633841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
232782cd038dSYoshinobu Inoue 		    "ICMP6 redirect sent from %s rejected; "
232882cd038dSYoshinobu Inoue 		    "hlim=%d (must be 255)\n",
23291d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
233033841545SHajimu UMEMOTO 		goto bad;
233182cd038dSYoshinobu Inoue 	}
233282cd038dSYoshinobu Inoue     {
233382cd038dSYoshinobu Inoue 	/* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
233482cd038dSYoshinobu Inoue 	struct sockaddr_in6 sin6;
233582cd038dSYoshinobu Inoue 	struct in6_addr *gw6;
233682cd038dSYoshinobu Inoue 
233782cd038dSYoshinobu Inoue 	bzero(&sin6, sizeof(sin6));
233882cd038dSYoshinobu Inoue 	sin6.sin6_family = AF_INET6;
233982cd038dSYoshinobu Inoue 	sin6.sin6_len = sizeof(struct sockaddr_in6);
234082cd038dSYoshinobu Inoue 	bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
234182cd038dSYoshinobu Inoue 	rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
234282cd038dSYoshinobu Inoue 	if (rt) {
2343deebc913SHajimu UMEMOTO 		if (rt->rt_gateway == NULL ||
2344deebc913SHajimu UMEMOTO 		    rt->rt_gateway->sa_family != AF_INET6) {
234533841545SHajimu UMEMOTO 			nd6log((LOG_ERR,
2346deebc913SHajimu UMEMOTO 			    "ICMP6 redirect rejected; no route "
2347deebc913SHajimu UMEMOTO 			    "with inet6 gateway found for redirect dst: %s\n",
234833841545SHajimu UMEMOTO 			    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2349d1dd20beSSam Leffler 			RTFREE_LOCKED(rt);
235033841545SHajimu UMEMOTO 			goto bad;
2351deebc913SHajimu UMEMOTO 		}
2352deebc913SHajimu UMEMOTO 
235382cd038dSYoshinobu Inoue 		gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
235482cd038dSYoshinobu Inoue 		if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
235533841545SHajimu UMEMOTO 			nd6log((LOG_ERR,
235682cd038dSYoshinobu Inoue 			    "ICMP6 redirect rejected; "
235782cd038dSYoshinobu Inoue 			    "not equal to gw-for-src=%s (must be same): "
235882cd038dSYoshinobu Inoue 			    "%s\n",
23591d54aa3bSBjoern A. Zeeb 			    ip6_sprintf(ip6buf, gw6),
236033841545SHajimu UMEMOTO 			    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2361d1dd20beSSam Leffler 			RTFREE_LOCKED(rt);
236233841545SHajimu UMEMOTO 			goto bad;
236382cd038dSYoshinobu Inoue 		}
236482cd038dSYoshinobu Inoue 	} else {
236533841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
236682cd038dSYoshinobu Inoue 		    "ICMP6 redirect rejected; "
236782cd038dSYoshinobu Inoue 		    "no route found for redirect dst: %s\n",
236833841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
236933841545SHajimu UMEMOTO 		goto bad;
237082cd038dSYoshinobu Inoue 	}
2371d1dd20beSSam Leffler 	RTFREE_LOCKED(rt);
237282cd038dSYoshinobu Inoue 	rt = NULL;
237382cd038dSYoshinobu Inoue     }
237482cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
237533841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
237682cd038dSYoshinobu Inoue 		    "ICMP6 redirect rejected; "
237782cd038dSYoshinobu Inoue 		    "redirect dst must be unicast: %s\n",
237833841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
237933841545SHajimu UMEMOTO 		goto bad;
238082cd038dSYoshinobu Inoue 	}
238182cd038dSYoshinobu Inoue 
238282cd038dSYoshinobu Inoue 	is_router = is_onlink = 0;
238382cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
238482cd038dSYoshinobu Inoue 		is_router = 1;	/* router case */
238582cd038dSYoshinobu Inoue 	if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
238682cd038dSYoshinobu Inoue 		is_onlink = 1;	/* on-link destination case */
238782cd038dSYoshinobu Inoue 	if (!is_router && !is_onlink) {
238833841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
238982cd038dSYoshinobu Inoue 		    "ICMP6 redirect rejected; "
239082cd038dSYoshinobu Inoue 		    "neither router case nor onlink case: %s\n",
239133841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
239233841545SHajimu UMEMOTO 		goto bad;
239382cd038dSYoshinobu Inoue 	}
239482cd038dSYoshinobu Inoue 	/* validation passed */
239582cd038dSYoshinobu Inoue 
239682cd038dSYoshinobu Inoue 	icmp6len -= sizeof(*nd_rd);
239782cd038dSYoshinobu Inoue 	nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
239882cd038dSYoshinobu Inoue 	if (nd6_options(&ndopts) < 0) {
239933841545SHajimu UMEMOTO 		nd6log((LOG_INFO, "icmp6_redirect_input: "
240082cd038dSYoshinobu Inoue 		    "invalid ND option, rejected: %s\n",
240133841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
240233841545SHajimu UMEMOTO 		/* nd6_options have incremented stats */
2403686cdd19SJun-ichiro itojun Hagino 		goto freeit;
240482cd038dSYoshinobu Inoue 	}
240582cd038dSYoshinobu Inoue 
240682cd038dSYoshinobu Inoue 	if (ndopts.nd_opts_tgt_lladdr) {
240782cd038dSYoshinobu Inoue 		lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
240882cd038dSYoshinobu Inoue 		lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
240982cd038dSYoshinobu Inoue 	}
241082cd038dSYoshinobu Inoue 
241182cd038dSYoshinobu Inoue 	if (ndopts.nd_opts_rh) {
241282cd038dSYoshinobu Inoue 		redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
241382cd038dSYoshinobu Inoue 		redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
241482cd038dSYoshinobu Inoue 	}
241582cd038dSYoshinobu Inoue 
241682cd038dSYoshinobu Inoue 	if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
241733841545SHajimu UMEMOTO 		nd6log((LOG_INFO,
241882cd038dSYoshinobu Inoue 		    "icmp6_redirect_input: lladdrlen mismatch for %s "
241982cd038dSYoshinobu Inoue 		    "(if %d, icmp6 packet %d): %s\n",
24201d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6buf, &redtgt6),
24211d54aa3bSBjoern A. Zeeb 		    ifp->if_addrlen, lladdrlen - 2,
242233841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
242333841545SHajimu UMEMOTO 		goto bad;
242482cd038dSYoshinobu Inoue 	}
242582cd038dSYoshinobu Inoue 
242682cd038dSYoshinobu Inoue 	/* RFC 2461 8.3 */
242782cd038dSYoshinobu Inoue 	nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
242882cd038dSYoshinobu Inoue 	    is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
242982cd038dSYoshinobu Inoue 
243082cd038dSYoshinobu Inoue 	if (!is_onlink) {	/* better router case.  perform rtredirect. */
243182cd038dSYoshinobu Inoue 		/* perform rtredirect */
243282cd038dSYoshinobu Inoue 		struct sockaddr_in6 sdst;
243382cd038dSYoshinobu Inoue 		struct sockaddr_in6 sgw;
243482cd038dSYoshinobu Inoue 		struct sockaddr_in6 ssrc;
243582cd038dSYoshinobu Inoue 
243682cd038dSYoshinobu Inoue 		bzero(&sdst, sizeof(sdst));
243782cd038dSYoshinobu Inoue 		bzero(&sgw, sizeof(sgw));
243882cd038dSYoshinobu Inoue 		bzero(&ssrc, sizeof(ssrc));
243982cd038dSYoshinobu Inoue 		sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
244082cd038dSYoshinobu Inoue 		sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
244182cd038dSYoshinobu Inoue 			sizeof(struct sockaddr_in6);
244282cd038dSYoshinobu Inoue 		bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
244382cd038dSYoshinobu Inoue 		bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
244482cd038dSYoshinobu Inoue 		bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
244582cd038dSYoshinobu Inoue 		rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
244682cd038dSYoshinobu Inoue 		    (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
2447d1dd20beSSam Leffler 		    (struct sockaddr *)&ssrc);
244882cd038dSYoshinobu Inoue 	}
244982cd038dSYoshinobu Inoue 	/* finally update cached route in each socket via pfctlinput */
245082cd038dSYoshinobu Inoue     {
245182cd038dSYoshinobu Inoue 	struct sockaddr_in6 sdst;
245282cd038dSYoshinobu Inoue 
245382cd038dSYoshinobu Inoue 	bzero(&sdst, sizeof(sdst));
245482cd038dSYoshinobu Inoue 	sdst.sin6_family = AF_INET6;
245582cd038dSYoshinobu Inoue 	sdst.sin6_len = sizeof(struct sockaddr_in6);
245682cd038dSYoshinobu Inoue 	bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
245782cd038dSYoshinobu Inoue 	pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2458b2630c29SGeorge V. Neville-Neil #ifdef IPSEC
245982cd038dSYoshinobu Inoue 	key_sa_routechange((struct sockaddr *)&sdst);
2460b2630c29SGeorge V. Neville-Neil #endif /* IPSEC */
246182cd038dSYoshinobu Inoue     }
2462686cdd19SJun-ichiro itojun Hagino 
2463686cdd19SJun-ichiro itojun Hagino  freeit:
2464686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
246533841545SHajimu UMEMOTO 	return;
246633841545SHajimu UMEMOTO 
246733841545SHajimu UMEMOTO  bad:
2468e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_badredirect);
246933841545SHajimu UMEMOTO 	m_freem(m);
247082cd038dSYoshinobu Inoue }
247182cd038dSYoshinobu Inoue 
247282cd038dSYoshinobu Inoue void
24731272577eSXin LI icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
247482cd038dSYoshinobu Inoue {
24758b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
247682cd038dSYoshinobu Inoue 	struct ifnet *ifp;	/* my outgoing interface */
247782cd038dSYoshinobu Inoue 	struct in6_addr *ifp_ll6;
247882cd038dSYoshinobu Inoue 	struct in6_addr *router_ll6;
247982cd038dSYoshinobu Inoue 	struct ip6_hdr *sip6;	/* m0 as struct ip6_hdr */
248082cd038dSYoshinobu Inoue 	struct mbuf *m = NULL;	/* newly allocated one */
248182cd038dSYoshinobu Inoue 	struct ip6_hdr *ip6;	/* m as struct ip6_hdr */
248282cd038dSYoshinobu Inoue 	struct nd_redirect *nd_rd;
248356c423b0SKip Macy 	struct llentry *ln = NULL;
248482cd038dSYoshinobu Inoue 	size_t maxlen;
248582cd038dSYoshinobu Inoue 	u_char *p;
248682cd038dSYoshinobu Inoue 	struct ifnet *outif = NULL;
2487686cdd19SJun-ichiro itojun Hagino 	struct sockaddr_in6 src_sa;
2488686cdd19SJun-ichiro itojun Hagino 
2489603724d3SBjoern A. Zeeb 	icmp6_errcount(&V_icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
249082cd038dSYoshinobu Inoue 
249182cd038dSYoshinobu Inoue 	/* if we are not router, we don't send icmp6 redirect */
2492603724d3SBjoern A. Zeeb 	if (!V_ip6_forwarding)
249382cd038dSYoshinobu Inoue 		goto fail;
249482cd038dSYoshinobu Inoue 
249582cd038dSYoshinobu Inoue 	/* sanity check */
249682cd038dSYoshinobu Inoue 	if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
249782cd038dSYoshinobu Inoue 		goto fail;
249882cd038dSYoshinobu Inoue 
249982cd038dSYoshinobu Inoue 	/*
250082cd038dSYoshinobu Inoue 	 * Address check:
250182cd038dSYoshinobu Inoue 	 *  the source address must identify a neighbor, and
250282cd038dSYoshinobu Inoue 	 *  the destination address must not be a multicast address
250382cd038dSYoshinobu Inoue 	 *  [RFC 2461, sec 8.2]
250482cd038dSYoshinobu Inoue 	 */
250582cd038dSYoshinobu Inoue 	sip6 = mtod(m0, struct ip6_hdr *);
2506686cdd19SJun-ichiro itojun Hagino 	bzero(&src_sa, sizeof(src_sa));
2507686cdd19SJun-ichiro itojun Hagino 	src_sa.sin6_family = AF_INET6;
2508686cdd19SJun-ichiro itojun Hagino 	src_sa.sin6_len = sizeof(src_sa);
2509686cdd19SJun-ichiro itojun Hagino 	src_sa.sin6_addr = sip6->ip6_src;
2510686cdd19SJun-ichiro itojun Hagino 	if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
251182cd038dSYoshinobu Inoue 		goto fail;
251282cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
251382cd038dSYoshinobu Inoue 		goto fail;	/* what should we do here? */
251482cd038dSYoshinobu Inoue 
251582cd038dSYoshinobu Inoue 	/* rate limit */
251682cd038dSYoshinobu Inoue 	if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
251782cd038dSYoshinobu Inoue 		goto fail;
251882cd038dSYoshinobu Inoue 
251982cd038dSYoshinobu Inoue 	/*
252082cd038dSYoshinobu Inoue 	 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
252182cd038dSYoshinobu Inoue 	 * we almost always ask for an mbuf cluster for simplicity.
252282cd038dSYoshinobu Inoue 	 * (MHLEN < IPV6_MMTU is almost always true)
252382cd038dSYoshinobu Inoue 	 */
2524686cdd19SJun-ichiro itojun Hagino #if IPV6_MMTU >= MCLBYTES
2525686cdd19SJun-ichiro itojun Hagino # error assumption failed about IPV6_MMTU and MCLBYTES
2526686cdd19SJun-ichiro itojun Hagino #endif
2527a163d034SWarner Losh 	MGETHDR(m, M_DONTWAIT, MT_HEADER);
2528686cdd19SJun-ichiro itojun Hagino 	if (m && IPV6_MMTU >= MHLEN)
2529a163d034SWarner Losh 		MCLGET(m, M_DONTWAIT);
253082cd038dSYoshinobu Inoue 	if (!m)
253182cd038dSYoshinobu Inoue 		goto fail;
253233841545SHajimu UMEMOTO 	m->m_pkthdr.rcvif = NULL;
253333841545SHajimu UMEMOTO 	m->m_len = 0;
253433841545SHajimu UMEMOTO 	maxlen = M_TRAILINGSPACE(m);
253582cd038dSYoshinobu Inoue 	maxlen = min(IPV6_MMTU, maxlen);
253682cd038dSYoshinobu Inoue 	/* just for safety */
2537686cdd19SJun-ichiro itojun Hagino 	if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2538686cdd19SJun-ichiro itojun Hagino 	    ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
253982cd038dSYoshinobu Inoue 		goto fail;
2540686cdd19SJun-ichiro itojun Hagino 	}
254182cd038dSYoshinobu Inoue 
254282cd038dSYoshinobu Inoue 	{
254382cd038dSYoshinobu Inoue 		/* get ip6 linklocal address for ifp(my outgoing interface). */
2544686cdd19SJun-ichiro itojun Hagino 		struct in6_ifaddr *ia;
2545686cdd19SJun-ichiro itojun Hagino 		if ((ia = in6ifa_ifpforlinklocal(ifp,
2546686cdd19SJun-ichiro itojun Hagino 						 IN6_IFF_NOTREADY|
2547686cdd19SJun-ichiro itojun Hagino 						 IN6_IFF_ANYCAST)) == NULL)
254882cd038dSYoshinobu Inoue 			goto fail;
254982cd038dSYoshinobu Inoue 		ifp_ll6 = &ia->ia_addr.sin6_addr;
25508c0fec80SRobert Watson 		/* XXXRW: reference released prematurely. */
25518c0fec80SRobert Watson 		ifa_free(&ia->ia_ifa);
255282cd038dSYoshinobu Inoue 	}
255382cd038dSYoshinobu Inoue 
255482cd038dSYoshinobu Inoue 	/* get ip6 linklocal address for the router. */
255582cd038dSYoshinobu Inoue 	if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
255682cd038dSYoshinobu Inoue 		struct sockaddr_in6 *sin6;
255782cd038dSYoshinobu Inoue 		sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
255882cd038dSYoshinobu Inoue 		router_ll6 = &sin6->sin6_addr;
255982cd038dSYoshinobu Inoue 		if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
256082cd038dSYoshinobu Inoue 			router_ll6 = (struct in6_addr *)NULL;
256182cd038dSYoshinobu Inoue 	} else
256282cd038dSYoshinobu Inoue 		router_ll6 = (struct in6_addr *)NULL;
256382cd038dSYoshinobu Inoue 
256482cd038dSYoshinobu Inoue 	/* ip6 */
256582cd038dSYoshinobu Inoue 	ip6 = mtod(m, struct ip6_hdr *);
256682cd038dSYoshinobu Inoue 	ip6->ip6_flow = 0;
2567686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2568686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc |= IPV6_VERSION;
256982cd038dSYoshinobu Inoue 	/* ip6->ip6_plen will be set later */
257082cd038dSYoshinobu Inoue 	ip6->ip6_nxt = IPPROTO_ICMPV6;
257182cd038dSYoshinobu Inoue 	ip6->ip6_hlim = 255;
257282cd038dSYoshinobu Inoue 	/* ip6->ip6_src must be linklocal addr for my outgoing if. */
257382cd038dSYoshinobu Inoue 	bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
257482cd038dSYoshinobu Inoue 	bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
257582cd038dSYoshinobu Inoue 
257682cd038dSYoshinobu Inoue 	/* ND Redirect */
257782cd038dSYoshinobu Inoue 	nd_rd = (struct nd_redirect *)(ip6 + 1);
257882cd038dSYoshinobu Inoue 	nd_rd->nd_rd_type = ND_REDIRECT;
257982cd038dSYoshinobu Inoue 	nd_rd->nd_rd_code = 0;
258082cd038dSYoshinobu Inoue 	nd_rd->nd_rd_reserved = 0;
258182cd038dSYoshinobu Inoue 	if (rt->rt_flags & RTF_GATEWAY) {
258282cd038dSYoshinobu Inoue 		/*
258382cd038dSYoshinobu Inoue 		 * nd_rd->nd_rd_target must be a link-local address in
258482cd038dSYoshinobu Inoue 		 * better router cases.
258582cd038dSYoshinobu Inoue 		 */
258682cd038dSYoshinobu Inoue 		if (!router_ll6)
258782cd038dSYoshinobu Inoue 			goto fail;
258882cd038dSYoshinobu Inoue 		bcopy(router_ll6, &nd_rd->nd_rd_target,
258982cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_target));
259082cd038dSYoshinobu Inoue 		bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
259182cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_dst));
259282cd038dSYoshinobu Inoue 	} else {
259382cd038dSYoshinobu Inoue 		/* make sure redtgt == reddst */
259482cd038dSYoshinobu Inoue 		bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
259582cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_target));
259682cd038dSYoshinobu Inoue 		bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
259782cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_dst));
259882cd038dSYoshinobu Inoue 	}
259982cd038dSYoshinobu Inoue 
260082cd038dSYoshinobu Inoue 	p = (u_char *)(nd_rd + 1);
260182cd038dSYoshinobu Inoue 
260282cd038dSYoshinobu Inoue 	if (!router_ll6)
260382cd038dSYoshinobu Inoue 		goto nolladdropt;
260482cd038dSYoshinobu Inoue 
260582cd038dSYoshinobu Inoue 	{
260682cd038dSYoshinobu Inoue 		/* target lladdr option */
260782cd038dSYoshinobu Inoue 		int len;
260882cd038dSYoshinobu Inoue 		struct nd_opt_hdr *nd_opt;
260982cd038dSYoshinobu Inoue 		char *lladdr;
261082cd038dSYoshinobu Inoue 
26116e6b3f7cSQing Li 		IF_AFDATA_LOCK(ifp);
26126e6b3f7cSQing Li 		ln = nd6_lookup(router_ll6, 0, ifp);
26136e6b3f7cSQing Li 		IF_AFDATA_UNLOCK(ifp);
261456c423b0SKip Macy 		if (ln == NULL)
261582cd038dSYoshinobu Inoue 			goto nolladdropt;
26166e6b3f7cSQing Li 
2617686cdd19SJun-ichiro itojun Hagino 		len = sizeof(*nd_opt) + ifp->if_addrlen;
2618686cdd19SJun-ichiro itojun Hagino 		len = (len + 7) & ~7;	/* round by 8 */
2619686cdd19SJun-ichiro itojun Hagino 		/* safety check */
2620686cdd19SJun-ichiro itojun Hagino 		if (len + (p - (u_char *)ip6) > maxlen)
2621686cdd19SJun-ichiro itojun Hagino 			goto nolladdropt;
26226e6b3f7cSQing Li 
26236e6b3f7cSQing Li 		if (ln->la_flags & LLE_VALID) {
262482cd038dSYoshinobu Inoue 			nd_opt = (struct nd_opt_hdr *)p;
262582cd038dSYoshinobu Inoue 			nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
262682cd038dSYoshinobu Inoue 			nd_opt->nd_opt_len = len >> 3;
262782cd038dSYoshinobu Inoue 			lladdr = (char *)(nd_opt + 1);
26286e6b3f7cSQing Li 			bcopy(&ln->ll_addr, lladdr, ifp->if_addrlen);
2629686cdd19SJun-ichiro itojun Hagino 			p += len;
263082cd038dSYoshinobu Inoue 		}
263182cd038dSYoshinobu Inoue 	}
263256c423b0SKip Macy nolladdropt:
263356c423b0SKip Macy 	if (ln != NULL)
263456c423b0SKip Macy 		LLE_RUNLOCK(ln);
263582cd038dSYoshinobu Inoue 
263682cd038dSYoshinobu Inoue 	m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
263782cd038dSYoshinobu Inoue 
263882cd038dSYoshinobu Inoue 	/* just to be safe */
2639686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED	/*not openbsd*/
264082cd038dSYoshinobu Inoue 	if (m0->m_flags & M_DECRYPTED)
264182cd038dSYoshinobu Inoue 		goto noredhdropt;
2642686cdd19SJun-ichiro itojun Hagino #endif
2643686cdd19SJun-ichiro itojun Hagino 	if (p - (u_char *)ip6 > maxlen)
2644686cdd19SJun-ichiro itojun Hagino 		goto noredhdropt;
264582cd038dSYoshinobu Inoue 
264682cd038dSYoshinobu Inoue 	{
264782cd038dSYoshinobu Inoue 		/* redirected header option */
264882cd038dSYoshinobu Inoue 		int len;
264982cd038dSYoshinobu Inoue 		struct nd_opt_rd_hdr *nd_opt_rh;
265082cd038dSYoshinobu Inoue 
265182cd038dSYoshinobu Inoue 		/*
265282cd038dSYoshinobu Inoue 		 * compute the maximum size for icmp6 redirect header option.
265382cd038dSYoshinobu Inoue 		 * XXX room for auth header?
265482cd038dSYoshinobu Inoue 		 */
265582cd038dSYoshinobu Inoue 		len = maxlen - (p - (u_char *)ip6);
265682cd038dSYoshinobu Inoue 		len &= ~7;
265782cd038dSYoshinobu Inoue 
265882cd038dSYoshinobu Inoue 		/* This is just for simplicity. */
265982cd038dSYoshinobu Inoue 		if (m0->m_pkthdr.len != m0->m_len) {
266082cd038dSYoshinobu Inoue 			if (m0->m_next) {
266182cd038dSYoshinobu Inoue 				m_freem(m0->m_next);
266282cd038dSYoshinobu Inoue 				m0->m_next = NULL;
266382cd038dSYoshinobu Inoue 			}
266482cd038dSYoshinobu Inoue 			m0->m_pkthdr.len = m0->m_len;
266582cd038dSYoshinobu Inoue 		}
266682cd038dSYoshinobu Inoue 
266782cd038dSYoshinobu Inoue 		/*
266882cd038dSYoshinobu Inoue 		 * Redirected header option spec (RFC2461 4.6.3) talks nothing
266982cd038dSYoshinobu Inoue 		 * about padding/truncate rule for the original IP packet.
267006cd0a3fSHajimu UMEMOTO 		 * From the discussion on IPv6imp in Feb 1999,
267106cd0a3fSHajimu UMEMOTO 		 * the consensus was:
267282cd038dSYoshinobu Inoue 		 * - "attach as much as possible" is the goal
267306cd0a3fSHajimu UMEMOTO 		 * - pad if not aligned (original size can be guessed by
267406cd0a3fSHajimu UMEMOTO 		 *   original ip6 header)
267582cd038dSYoshinobu Inoue 		 * Following code adds the padding if it is simple enough,
267682cd038dSYoshinobu Inoue 		 * and truncates if not.
267782cd038dSYoshinobu Inoue 		 */
267882cd038dSYoshinobu Inoue 		if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
267906cd0a3fSHajimu UMEMOTO 			panic("assumption failed in %s:%d", __FILE__,
268006cd0a3fSHajimu UMEMOTO 			    __LINE__);
268182cd038dSYoshinobu Inoue 
268282cd038dSYoshinobu Inoue 		if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
268382cd038dSYoshinobu Inoue 			/* not enough room, truncate */
268406cd0a3fSHajimu UMEMOTO 			m0->m_pkthdr.len = m0->m_len = len -
268506cd0a3fSHajimu UMEMOTO 			    sizeof(*nd_opt_rh);
268682cd038dSYoshinobu Inoue 		} else {
268782cd038dSYoshinobu Inoue 			/* enough room, pad or truncate */
268882cd038dSYoshinobu Inoue 			size_t extra;
268982cd038dSYoshinobu Inoue 
269082cd038dSYoshinobu Inoue 			extra = m0->m_pkthdr.len % 8;
269182cd038dSYoshinobu Inoue 			if (extra) {
269282cd038dSYoshinobu Inoue 				/* pad if easy enough, truncate if not */
269382cd038dSYoshinobu Inoue 				if (8 - extra <= M_TRAILINGSPACE(m0)) {
269482cd038dSYoshinobu Inoue 					/* pad */
269582cd038dSYoshinobu Inoue 					m0->m_len += (8 - extra);
269682cd038dSYoshinobu Inoue 					m0->m_pkthdr.len += (8 - extra);
269782cd038dSYoshinobu Inoue 				} else {
269882cd038dSYoshinobu Inoue 					/* truncate */
269982cd038dSYoshinobu Inoue 					m0->m_pkthdr.len -= extra;
270082cd038dSYoshinobu Inoue 					m0->m_len -= extra;
270182cd038dSYoshinobu Inoue 				}
270282cd038dSYoshinobu Inoue 			}
270382cd038dSYoshinobu Inoue 			len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
270406cd0a3fSHajimu UMEMOTO 			m0->m_pkthdr.len = m0->m_len = len -
270506cd0a3fSHajimu UMEMOTO 			    sizeof(*nd_opt_rh);
270682cd038dSYoshinobu Inoue 		}
270782cd038dSYoshinobu Inoue 
270882cd038dSYoshinobu Inoue 		nd_opt_rh = (struct nd_opt_rd_hdr *)p;
270982cd038dSYoshinobu Inoue 		bzero(nd_opt_rh, sizeof(*nd_opt_rh));
271082cd038dSYoshinobu Inoue 		nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
271182cd038dSYoshinobu Inoue 		nd_opt_rh->nd_opt_rh_len = len >> 3;
271282cd038dSYoshinobu Inoue 		p += sizeof(*nd_opt_rh);
271382cd038dSYoshinobu Inoue 		m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
271482cd038dSYoshinobu Inoue 
271582cd038dSYoshinobu Inoue 		/* connect m0 to m */
2716db06e8a0SSUZUKI Shinsuke 		m_tag_delete_chain(m0, NULL);
2717db06e8a0SSUZUKI Shinsuke 		m0->m_flags &= ~M_PKTHDR;
271882cd038dSYoshinobu Inoue 		m->m_next = m0;
271982cd038dSYoshinobu Inoue 		m->m_pkthdr.len = m->m_len + m0->m_len;
2720db06e8a0SSUZUKI Shinsuke 		m0 = NULL;
272182cd038dSYoshinobu Inoue 	}
272282cd038dSYoshinobu Inoue noredhdropt:;
2723db06e8a0SSUZUKI Shinsuke 	if (m0) {
2724db06e8a0SSUZUKI Shinsuke 		m_freem(m0);
2725db06e8a0SSUZUKI Shinsuke 		m0 = NULL;
2726db06e8a0SSUZUKI Shinsuke 	}
272782cd038dSYoshinobu Inoue 
27289a4f9608SHajimu UMEMOTO 	/* XXX: clear embedded link IDs in the inner header */
27299a4f9608SHajimu UMEMOTO 	in6_clearscope(&sip6->ip6_src);
27309a4f9608SHajimu UMEMOTO 	in6_clearscope(&sip6->ip6_dst);
27319a4f9608SHajimu UMEMOTO 	in6_clearscope(&nd_rd->nd_rd_target);
27329a4f9608SHajimu UMEMOTO 	in6_clearscope(&nd_rd->nd_rd_dst);
273382cd038dSYoshinobu Inoue 
273482cd038dSYoshinobu Inoue 	ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
273582cd038dSYoshinobu Inoue 
273682cd038dSYoshinobu Inoue 	nd_rd->nd_rd_cksum = 0;
273706cd0a3fSHajimu UMEMOTO 	nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
273806cd0a3fSHajimu UMEMOTO 	    sizeof(*ip6), ntohs(ip6->ip6_plen));
273982cd038dSYoshinobu Inoue 
274082cd038dSYoshinobu Inoue 	/* send the packet to outside... */
27415d846453SSam Leffler 	ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
274282cd038dSYoshinobu Inoue 	if (outif) {
274382cd038dSYoshinobu Inoue 		icmp6_ifstat_inc(outif, ifs6_out_msg);
274482cd038dSYoshinobu Inoue 		icmp6_ifstat_inc(outif, ifs6_out_redirect);
274582cd038dSYoshinobu Inoue 	}
2746e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]);
274782cd038dSYoshinobu Inoue 
274882cd038dSYoshinobu Inoue 	return;
274982cd038dSYoshinobu Inoue 
275082cd038dSYoshinobu Inoue fail:
275182cd038dSYoshinobu Inoue 	if (m)
275282cd038dSYoshinobu Inoue 		m_freem(m);
275382cd038dSYoshinobu Inoue 	if (m0)
275482cd038dSYoshinobu Inoue 		m_freem(m0);
275582cd038dSYoshinobu Inoue }
275682cd038dSYoshinobu Inoue 
275782cd038dSYoshinobu Inoue /*
275882cd038dSYoshinobu Inoue  * ICMPv6 socket option processing.
275982cd038dSYoshinobu Inoue  */
276082cd038dSYoshinobu Inoue int
27611272577eSXin LI icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
276282cd038dSYoshinobu Inoue {
276382cd038dSYoshinobu Inoue 	int error = 0;
276482cd038dSYoshinobu Inoue 	int optlen;
276533841545SHajimu UMEMOTO 	struct inpcb *inp = sotoinpcb(so);
276682cd038dSYoshinobu Inoue 	int level, op, optname;
276782cd038dSYoshinobu Inoue 
276882cd038dSYoshinobu Inoue 	if (sopt) {
276982cd038dSYoshinobu Inoue 		level = sopt->sopt_level;
277082cd038dSYoshinobu Inoue 		op = sopt->sopt_dir;
277182cd038dSYoshinobu Inoue 		optname = sopt->sopt_name;
277282cd038dSYoshinobu Inoue 		optlen = sopt->sopt_valsize;
277382cd038dSYoshinobu Inoue 	} else
277482cd038dSYoshinobu Inoue 		level = op = optname = optlen = 0;
277533841545SHajimu UMEMOTO 
277682cd038dSYoshinobu Inoue 	if (level != IPPROTO_ICMPV6) {
277782cd038dSYoshinobu Inoue 		return EINVAL;
277882cd038dSYoshinobu Inoue 	}
277982cd038dSYoshinobu Inoue 
278082cd038dSYoshinobu Inoue 	switch (op) {
278182cd038dSYoshinobu Inoue 	case PRCO_SETOPT:
278282cd038dSYoshinobu Inoue 		switch (optname) {
278382cd038dSYoshinobu Inoue 		case ICMP6_FILTER:
278482cd038dSYoshinobu Inoue 		    {
2785ae89d5a3SRobert Watson 			struct icmp6_filter ic6f;
278682cd038dSYoshinobu Inoue 
2787ae89d5a3SRobert Watson 			if (optlen != sizeof(ic6f)) {
278882cd038dSYoshinobu Inoue 				error = EMSGSIZE;
278982cd038dSYoshinobu Inoue 				break;
279082cd038dSYoshinobu Inoue 			}
2791ae89d5a3SRobert Watson 			error = sooptcopyin(sopt, &ic6f, optlen, optlen);
2792ae89d5a3SRobert Watson 			if (error == 0) {
2793ae89d5a3SRobert Watson 				INP_WLOCK(inp);
2794ae89d5a3SRobert Watson 				*inp->in6p_icmp6filt = ic6f;
2795ae89d5a3SRobert Watson 				INP_WUNLOCK(inp);
2796ae89d5a3SRobert Watson 			}
279782cd038dSYoshinobu Inoue 			break;
279882cd038dSYoshinobu Inoue 		    }
279982cd038dSYoshinobu Inoue 
280082cd038dSYoshinobu Inoue 		default:
280182cd038dSYoshinobu Inoue 			error = ENOPROTOOPT;
280282cd038dSYoshinobu Inoue 			break;
280382cd038dSYoshinobu Inoue 		}
280482cd038dSYoshinobu Inoue 		break;
280582cd038dSYoshinobu Inoue 
280682cd038dSYoshinobu Inoue 	case PRCO_GETOPT:
280782cd038dSYoshinobu Inoue 		switch (optname) {
280882cd038dSYoshinobu Inoue 		case ICMP6_FILTER:
280982cd038dSYoshinobu Inoue 		    {
2810ae89d5a3SRobert Watson 			struct icmp6_filter ic6f;
2811ae89d5a3SRobert Watson 
2812ae89d5a3SRobert Watson 			INP_RLOCK(inp);
2813ae89d5a3SRobert Watson 			ic6f = *inp->in6p_icmp6filt;
2814ae89d5a3SRobert Watson 			INP_RUNLOCK(inp);
2815ae89d5a3SRobert Watson 			error = sooptcopyout(sopt, &ic6f, sizeof(ic6f));
281682cd038dSYoshinobu Inoue 			break;
281782cd038dSYoshinobu Inoue 		    }
281882cd038dSYoshinobu Inoue 
281982cd038dSYoshinobu Inoue 		default:
282082cd038dSYoshinobu Inoue 			error = ENOPROTOOPT;
282182cd038dSYoshinobu Inoue 			break;
282282cd038dSYoshinobu Inoue 		}
282382cd038dSYoshinobu Inoue 		break;
282482cd038dSYoshinobu Inoue 	}
282582cd038dSYoshinobu Inoue 
282682cd038dSYoshinobu Inoue 	return (error);
282782cd038dSYoshinobu Inoue }
282882cd038dSYoshinobu Inoue 
282982cd038dSYoshinobu Inoue /*
283082cd038dSYoshinobu Inoue  * Perform rate limit check.
283182cd038dSYoshinobu Inoue  * Returns 0 if it is okay to send the icmp6 packet.
283282cd038dSYoshinobu Inoue  * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
283382cd038dSYoshinobu Inoue  * limitation.
283482cd038dSYoshinobu Inoue  *
283582cd038dSYoshinobu Inoue  * XXX per-destination/type check necessary?
28361272577eSXin LI  *
28371272577eSXin LI  * dst - not used at this moment
28381272577eSXin LI  * type - not used at this moment
28391272577eSXin LI  * code - not used at this moment
284082cd038dSYoshinobu Inoue  */
284182cd038dSYoshinobu Inoue static int
28421272577eSXin LI icmp6_ratelimit(const struct in6_addr *dst, const int type,
28431272577eSXin LI     const int code)
284482cd038dSYoshinobu Inoue {
28458b615593SMarko Zec 	INIT_VNET_INET6(curvnet);
2846686cdd19SJun-ichiro itojun Hagino 	int ret;
284782cd038dSYoshinobu Inoue 
2848686cdd19SJun-ichiro itojun Hagino 	ret = 0;	/* okay to send */
284982cd038dSYoshinobu Inoue 
2850686cdd19SJun-ichiro itojun Hagino 	/* PPS limit */
2851603724d3SBjoern A. Zeeb 	if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count,
2852603724d3SBjoern A. Zeeb 	    V_icmp6errppslim)) {
285382cd038dSYoshinobu Inoue 		/* The packet is subject to rate limit */
2854686cdd19SJun-ichiro itojun Hagino 		ret++;
285582cd038dSYoshinobu Inoue 	}
285682cd038dSYoshinobu Inoue 
2857686cdd19SJun-ichiro itojun Hagino 	return ret;
285882cd038dSYoshinobu Inoue }
2859