xref: /freebsd/sys/netinet6/ip6_output.c (revision 77931dd51335207eec43e1eaf54232ee9f2c95f7)
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: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $
3082cd038dSYoshinobu Inoue  */
3182cd038dSYoshinobu Inoue 
32caf43b02SWarner Losh /*-
3382cd038dSYoshinobu Inoue  * Copyright (c) 1982, 1986, 1988, 1990, 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_output.c	8.3 (Berkeley) 1/21/94
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"
68686cdd19SJun-ichiro itojun Hagino #include "opt_ipsec.h"
699b03990aSRandall Stewart #include "opt_sctp.h"
70*77931dd5SKip Macy #include "opt_route.h"
7182cd038dSYoshinobu Inoue 
7282cd038dSYoshinobu Inoue #include <sys/param.h>
73c26fe973SBjoern A. Zeeb #include <sys/kernel.h>
7482cd038dSYoshinobu Inoue #include <sys/malloc.h>
7582cd038dSYoshinobu Inoue #include <sys/mbuf.h>
7682cd038dSYoshinobu Inoue #include <sys/errno.h>
77c2259ba4SRobert Watson #include <sys/priv.h>
78c26fe973SBjoern A. Zeeb #include <sys/proc.h>
7982cd038dSYoshinobu Inoue #include <sys/protosw.h>
8082cd038dSYoshinobu Inoue #include <sys/socket.h>
8182cd038dSYoshinobu Inoue #include <sys/socketvar.h>
821263305fSBjoern A. Zeeb #include <sys/syslog.h>
83c26fe973SBjoern A. Zeeb #include <sys/ucred.h>
8482cd038dSYoshinobu Inoue 
8582cd038dSYoshinobu Inoue #include <net/if.h>
868195404bSBrooks Davis #include <net/netisr.h>
8782cd038dSYoshinobu Inoue #include <net/route.h>
88c4ac87eaSDarren Reed #include <net/pfil.h>
894b79449eSBjoern A. Zeeb #include <net/vnet.h>
9082cd038dSYoshinobu Inoue 
9182cd038dSYoshinobu Inoue #include <netinet/in.h>
9282cd038dSYoshinobu Inoue #include <netinet/in_var.h>
9333841545SHajimu UMEMOTO #include <netinet6/in6_var.h>
94686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h>
95686cdd19SJun-ichiro itojun Hagino #include <netinet/icmp6.h>
9682cd038dSYoshinobu Inoue #include <netinet6/ip6_var.h>
97686cdd19SJun-ichiro itojun Hagino #include <netinet/in_pcb.h>
9897d8d152SAndre Oppermann #include <netinet/tcp_var.h>
9982cd038dSYoshinobu Inoue #include <netinet6/nd6.h>
10082cd038dSYoshinobu Inoue 
101b2630c29SGeorge V. Neville-Neil #ifdef IPSEC
102b9234fafSSam Leffler #include <netipsec/ipsec.h>
103b9234fafSSam Leffler #include <netipsec/ipsec6.h>
104b9234fafSSam Leffler #include <netipsec/key.h>
1052cb64cb2SGeorge V. Neville-Neil #include <netinet6/ip6_ipsec.h>
106b2630c29SGeorge V. Neville-Neil #endif /* IPSEC */
1079b03990aSRandall Stewart #ifdef SCTP
1089b03990aSRandall Stewart #include <netinet/sctp.h>
1099b03990aSRandall Stewart #include <netinet/sctp_crc32.h>
1109b03990aSRandall Stewart #endif
111b9234fafSSam Leffler 
1121469c434SHajimu UMEMOTO #include <netinet6/ip6protosw.h>
113a1f7e5f8SHajimu UMEMOTO #include <netinet6/scope6_var.h>
1141469c434SHajimu UMEMOTO 
115*77931dd5SKip Macy #ifdef FLOWTABLE
116*77931dd5SKip Macy #include <net/flowtable.h>
117*77931dd5SKip Macy #endif
118*77931dd5SKip Macy 
11933cde130SBruce M Simpson extern int in6_mcast_loop;
12082cd038dSYoshinobu Inoue 
12182cd038dSYoshinobu Inoue struct ip6_exthdrs {
12282cd038dSYoshinobu Inoue 	struct mbuf *ip6e_ip6;
12382cd038dSYoshinobu Inoue 	struct mbuf *ip6e_hbh;
12482cd038dSYoshinobu Inoue 	struct mbuf *ip6e_dest1;
12582cd038dSYoshinobu Inoue 	struct mbuf *ip6e_rthdr;
12682cd038dSYoshinobu Inoue 	struct mbuf *ip6e_dest2;
12782cd038dSYoshinobu Inoue };
12882cd038dSYoshinobu Inoue 
129f95d4633SHajimu UMEMOTO static int ip6_pcbopt __P((int, u_char *, int, struct ip6_pktopts **,
13079ba3952SBjoern A. Zeeb 			   struct ucred *, int));
13182cd038dSYoshinobu Inoue static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *,
1327efe5d92SHajimu UMEMOTO 	struct socket *, struct sockopt *));
1339233d8f3SDavid E. O'Brien static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *);
13479ba3952SBjoern A. Zeeb static int ip6_setpktopt __P((int, u_char *, int, struct ip6_pktopts *,
13579ba3952SBjoern A. Zeeb 	struct ucred *, int, int, int));
136f95d4633SHajimu UMEMOTO 
1379233d8f3SDavid E. O'Brien static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
13882cd038dSYoshinobu Inoue static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int,
13982cd038dSYoshinobu Inoue 	struct ip6_frag **));
1409233d8f3SDavid E. O'Brien static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
1419233d8f3SDavid E. O'Brien static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
14231b3783cSHajimu UMEMOTO static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *,
143f95d4633SHajimu UMEMOTO 	struct ifnet *, struct in6_addr *, u_long *, int *));
1449233d8f3SDavid E. O'Brien static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
14582cd038dSYoshinobu Inoue 
1467efe5d92SHajimu UMEMOTO 
14782cd038dSYoshinobu Inoue /*
1482cb64cb2SGeorge V. Neville-Neil  * Make an extension header from option data.  hp is the source, and
1492cb64cb2SGeorge V. Neville-Neil  * mp is the destination.
1502cb64cb2SGeorge V. Neville-Neil  */
1512cb64cb2SGeorge V. Neville-Neil #define MAKE_EXTHDR(hp, mp)						\
1522cb64cb2SGeorge V. Neville-Neil     do {								\
1532cb64cb2SGeorge V. Neville-Neil 	if (hp) {							\
1542cb64cb2SGeorge V. Neville-Neil 		struct ip6_ext *eh = (struct ip6_ext *)(hp);		\
1552cb64cb2SGeorge V. Neville-Neil 		error = ip6_copyexthdr((mp), (caddr_t)(hp),		\
1562cb64cb2SGeorge V. Neville-Neil 		    ((eh)->ip6e_len + 1) << 3);				\
1572cb64cb2SGeorge V. Neville-Neil 		if (error)						\
1582cb64cb2SGeorge V. Neville-Neil 			goto freehdrs;					\
1592cb64cb2SGeorge V. Neville-Neil 	}								\
1602cb64cb2SGeorge V. Neville-Neil     } while (/*CONSTCOND*/ 0)
1612cb64cb2SGeorge V. Neville-Neil 
1622cb64cb2SGeorge V. Neville-Neil /*
1632cb64cb2SGeorge V. Neville-Neil  * Form a chain of extension headers.
1642cb64cb2SGeorge V. Neville-Neil  * m is the extension header mbuf
1652cb64cb2SGeorge V. Neville-Neil  * mp is the previous mbuf in the chain
1662cb64cb2SGeorge V. Neville-Neil  * p is the next header
1672cb64cb2SGeorge V. Neville-Neil  * i is the type of option.
1682cb64cb2SGeorge V. Neville-Neil  */
1692cb64cb2SGeorge V. Neville-Neil #define MAKE_CHAIN(m, mp, p, i)\
1702cb64cb2SGeorge V. Neville-Neil     do {\
1712cb64cb2SGeorge V. Neville-Neil 	if (m) {\
1722cb64cb2SGeorge V. Neville-Neil 		if (!hdrsplit) \
1732cb64cb2SGeorge V. Neville-Neil 			panic("assumption failed: hdr not split"); \
1742cb64cb2SGeorge V. Neville-Neil 		*mtod((m), u_char *) = *(p);\
1752cb64cb2SGeorge V. Neville-Neil 		*(p) = (i);\
1762cb64cb2SGeorge V. Neville-Neil 		p = mtod((m), u_char *);\
1772cb64cb2SGeorge V. Neville-Neil 		(m)->m_next = (mp)->m_next;\
1782cb64cb2SGeorge V. Neville-Neil 		(mp)->m_next = (m);\
1792cb64cb2SGeorge V. Neville-Neil 		(mp) = (m);\
1802cb64cb2SGeorge V. Neville-Neil 	}\
1812cb64cb2SGeorge V. Neville-Neil     } while (/*CONSTCOND*/ 0)
1822cb64cb2SGeorge V. Neville-Neil 
1832cb64cb2SGeorge V. Neville-Neil /*
18482cd038dSYoshinobu Inoue  * IP6 output. The packet in mbuf chain m contains a skeletal IP6
18582cd038dSYoshinobu Inoue  * header (with pri, len, nxt, hlim, src, dst).
18682cd038dSYoshinobu Inoue  * This function may modify ver and hlim only.
18782cd038dSYoshinobu Inoue  * The mbuf chain containing the packet will be freed.
18882cd038dSYoshinobu Inoue  * The mbuf opt, if present, will not be freed.
18933841545SHajimu UMEMOTO  *
19033841545SHajimu UMEMOTO  * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and
19133841545SHajimu UMEMOTO  * nd_ifinfo.linkmtu is u_int32_t.  so we use u_long to hold largest one,
19233841545SHajimu UMEMOTO  * which is rt_rmx.rmx_mtu.
1931272577eSXin LI  *
1941272577eSXin LI  * ifpp - XXX: just for statistics
19582cd038dSYoshinobu Inoue  */
19682cd038dSYoshinobu Inoue int
1971272577eSXin LI ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
1981272577eSXin LI     struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
1991272577eSXin LI     struct ifnet **ifpp, struct inpcb *inp)
20082cd038dSYoshinobu Inoue {
20182cd038dSYoshinobu Inoue 	struct ip6_hdr *ip6, *mhip6;
202686cdd19SJun-ichiro itojun Hagino 	struct ifnet *ifp, *origifp;
20382cd038dSYoshinobu Inoue 	struct mbuf *m = m0;
2042cb64cb2SGeorge V. Neville-Neil 	struct mbuf *mprev = NULL;
20582cd038dSYoshinobu Inoue 	int hlen, tlen, len, off;
20682cd038dSYoshinobu Inoue 	struct route_in6 ip6route;
207a1f7e5f8SHajimu UMEMOTO 	struct rtentry *rt = NULL;
208a1f7e5f8SHajimu UMEMOTO 	struct sockaddr_in6 *dst, src_sa, dst_sa;
2098195404bSBrooks Davis 	struct in6_addr odst;
21082cd038dSYoshinobu Inoue 	int error = 0;
2115da9f8faSJosef Karthauser 	struct in6_ifaddr *ia = NULL;
21282cd038dSYoshinobu Inoue 	u_long mtu;
213f95d4633SHajimu UMEMOTO 	int alwaysfrag, dontfrag;
21482cd038dSYoshinobu Inoue 	u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
21582cd038dSYoshinobu Inoue 	struct ip6_exthdrs exthdrs;
216a1f7e5f8SHajimu UMEMOTO 	struct in6_addr finaldst, src0, dst0;
217a1f7e5f8SHajimu UMEMOTO 	u_int32_t zone;
21882cd038dSYoshinobu Inoue 	struct route_in6 *ro_pmtu = NULL;
219*77931dd5SKip Macy 	int flevalid = 0;
22082cd038dSYoshinobu Inoue 	int hdrsplit = 0;
22182cd038dSYoshinobu Inoue 	int needipsec = 0;
2229b03990aSRandall Stewart #ifdef SCTP
2239b03990aSRandall Stewart 	int sw_csum;
2249b03990aSRandall Stewart #endif
225b2630c29SGeorge V. Neville-Neil #ifdef IPSEC
2262cb64cb2SGeorge V. Neville-Neil 	struct ipsec_output_state state;
2272cb64cb2SGeorge V. Neville-Neil 	struct ip6_rthdr *rh = NULL;
228b9234fafSSam Leffler 	int needipsectun = 0;
2292cb64cb2SGeorge V. Neville-Neil 	int segleft_org = 0;
230b9234fafSSam Leffler 	struct secpolicy *sp = NULL;
231b2630c29SGeorge V. Neville-Neil #endif /* IPSEC */
232b9234fafSSam Leffler 
233b9234fafSSam Leffler 	ip6 = mtod(m, struct ip6_hdr *);
2342cb64cb2SGeorge V. Neville-Neil 	if (ip6 == NULL) {
2352cb64cb2SGeorge V. Neville-Neil 		printf ("ip6 is NULL");
2362cb64cb2SGeorge V. Neville-Neil 		goto bad;
2372cb64cb2SGeorge V. Neville-Neil 	}
23882cd038dSYoshinobu Inoue 
2392cb64cb2SGeorge V. Neville-Neil 	finaldst = ip6->ip6_dst;
24082cd038dSYoshinobu Inoue 	bzero(&exthdrs, sizeof(exthdrs));
24182cd038dSYoshinobu Inoue 	if (opt) {
24282cd038dSYoshinobu Inoue 		/* Hop-by-Hop options header */
24382cd038dSYoshinobu Inoue 		MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
24482cd038dSYoshinobu Inoue 		/* Destination options header(1st part) */
24529bc2c48SHajimu UMEMOTO 		if (opt->ip6po_rthdr) {
24629bc2c48SHajimu UMEMOTO 			/*
24729bc2c48SHajimu UMEMOTO 			 * Destination options header(1st part)
2482cb64cb2SGeorge V. Neville-Neil 			 * This only makes sense with a routing header.
24929bc2c48SHajimu UMEMOTO 			 * See Section 9.2 of RFC 3542.
25029bc2c48SHajimu UMEMOTO 			 * Disabling this part just for MIP6 convenience is
25129bc2c48SHajimu UMEMOTO 			 * a bad idea.  We need to think carefully about a
25229bc2c48SHajimu UMEMOTO 			 * way to make the advanced API coexist with MIP6
25329bc2c48SHajimu UMEMOTO 			 * options, which might automatically be inserted in
25429bc2c48SHajimu UMEMOTO 			 * the kernel.
25529bc2c48SHajimu UMEMOTO 			 */
25682cd038dSYoshinobu Inoue 			MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
25729bc2c48SHajimu UMEMOTO 		}
25882cd038dSYoshinobu Inoue 		/* Routing header */
25982cd038dSYoshinobu Inoue 		MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
26082cd038dSYoshinobu Inoue 		/* Destination options header(2nd part) */
26182cd038dSYoshinobu Inoue 		MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
26282cd038dSYoshinobu Inoue 	}
26382cd038dSYoshinobu Inoue 
26482cd038dSYoshinobu Inoue 	/*
2652cb64cb2SGeorge V. Neville-Neil 	 * IPSec checking which handles several cases.
2662cb64cb2SGeorge V. Neville-Neil 	 * FAST IPSEC: We re-injected the packet.
26782cd038dSYoshinobu Inoue 	 */
268b2630c29SGeorge V. Neville-Neil #ifdef IPSEC
2692cb64cb2SGeorge V. Neville-Neil 	switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp, &sp))
2702cb64cb2SGeorge V. Neville-Neil 	{
2712cb64cb2SGeorge V. Neville-Neil 	case 1:                 /* Bad packet */
272b9234fafSSam Leffler 		goto freehdrs;
2732cb64cb2SGeorge V. Neville-Neil 	case -1:                /* Do IPSec */
274b9234fafSSam Leffler 		needipsec = 1;
2752cb64cb2SGeorge V. Neville-Neil 	case 0:                 /* No IPSec */
276b9234fafSSam Leffler 	default:
2772cb64cb2SGeorge V. Neville-Neil 		break;
278b9234fafSSam Leffler 	}
279b2630c29SGeorge V. Neville-Neil #endif /* IPSEC */
28082cd038dSYoshinobu Inoue 
28182cd038dSYoshinobu Inoue 	/*
28282cd038dSYoshinobu Inoue 	 * Calculate the total length of the extension header chain.
28382cd038dSYoshinobu Inoue 	 * Keep the length of the unfragmentable part for fragmentation.
28482cd038dSYoshinobu Inoue 	 */
28582cd038dSYoshinobu Inoue 	optlen = 0;
2862cb64cb2SGeorge V. Neville-Neil 	if (exthdrs.ip6e_hbh)
2872cb64cb2SGeorge V. Neville-Neil 		optlen += exthdrs.ip6e_hbh->m_len;
2882cb64cb2SGeorge V. Neville-Neil 	if (exthdrs.ip6e_dest1)
2892cb64cb2SGeorge V. Neville-Neil 		optlen += exthdrs.ip6e_dest1->m_len;
2902cb64cb2SGeorge V. Neville-Neil 	if (exthdrs.ip6e_rthdr)
2912cb64cb2SGeorge V. Neville-Neil 		optlen += exthdrs.ip6e_rthdr->m_len;
29282cd038dSYoshinobu Inoue 	unfragpartlen = optlen + sizeof(struct ip6_hdr);
2932cb64cb2SGeorge V. Neville-Neil 
29482cd038dSYoshinobu Inoue 	/* NOTE: we don't add AH/ESP length here. do that later. */
2952cb64cb2SGeorge V. Neville-Neil 	if (exthdrs.ip6e_dest2)
2962cb64cb2SGeorge V. Neville-Neil 		optlen += exthdrs.ip6e_dest2->m_len;
29782cd038dSYoshinobu Inoue 
29882cd038dSYoshinobu Inoue 	/*
29982cd038dSYoshinobu Inoue 	 * If we need IPsec, or there is at least one extension header,
30082cd038dSYoshinobu Inoue 	 * separate IP6 header from the payload.
30182cd038dSYoshinobu Inoue 	 */
30282cd038dSYoshinobu Inoue 	if ((needipsec || optlen) && !hdrsplit) {
30382cd038dSYoshinobu Inoue 		if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
30482cd038dSYoshinobu Inoue 			m = NULL;
30582cd038dSYoshinobu Inoue 			goto freehdrs;
30682cd038dSYoshinobu Inoue 		}
30782cd038dSYoshinobu Inoue 		m = exthdrs.ip6e_ip6;
30882cd038dSYoshinobu Inoue 		hdrsplit++;
30982cd038dSYoshinobu Inoue 	}
31082cd038dSYoshinobu Inoue 
31182cd038dSYoshinobu Inoue 	/* adjust pointer */
31282cd038dSYoshinobu Inoue 	ip6 = mtod(m, struct ip6_hdr *);
31382cd038dSYoshinobu Inoue 
31482cd038dSYoshinobu Inoue 	/* adjust mbuf packet header length */
31582cd038dSYoshinobu Inoue 	m->m_pkthdr.len += optlen;
31682cd038dSYoshinobu Inoue 	plen = m->m_pkthdr.len - sizeof(*ip6);
31782cd038dSYoshinobu Inoue 
31882cd038dSYoshinobu Inoue 	/* If this is a jumbo payload, insert a jumbo payload option. */
31982cd038dSYoshinobu Inoue 	if (plen > IPV6_MAXPACKET) {
32082cd038dSYoshinobu Inoue 		if (!hdrsplit) {
32182cd038dSYoshinobu Inoue 			if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
32282cd038dSYoshinobu Inoue 				m = NULL;
32382cd038dSYoshinobu Inoue 				goto freehdrs;
32482cd038dSYoshinobu Inoue 			}
32582cd038dSYoshinobu Inoue 			m = exthdrs.ip6e_ip6;
32682cd038dSYoshinobu Inoue 			hdrsplit++;
32782cd038dSYoshinobu Inoue 		}
32882cd038dSYoshinobu Inoue 		/* adjust pointer */
32982cd038dSYoshinobu Inoue 		ip6 = mtod(m, struct ip6_hdr *);
33082cd038dSYoshinobu Inoue 		if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
33182cd038dSYoshinobu Inoue 			goto freehdrs;
33282cd038dSYoshinobu Inoue 		ip6->ip6_plen = 0;
33382cd038dSYoshinobu Inoue 	} else
33482cd038dSYoshinobu Inoue 		ip6->ip6_plen = htons(plen);
33582cd038dSYoshinobu Inoue 
33682cd038dSYoshinobu Inoue 	/*
33782cd038dSYoshinobu Inoue 	 * Concatenate headers and fill in next header fields.
33882cd038dSYoshinobu Inoue 	 * Here we have, on "m"
33982cd038dSYoshinobu Inoue 	 *	IPv6 payload
34082cd038dSYoshinobu Inoue 	 * and we insert headers accordingly.  Finally, we should be getting:
34182cd038dSYoshinobu Inoue 	 *	IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
34282cd038dSYoshinobu Inoue 	 *
34382cd038dSYoshinobu Inoue 	 * during the header composing process, "m" points to IPv6 header.
34482cd038dSYoshinobu Inoue 	 * "mprev" points to an extension header prior to esp.
34582cd038dSYoshinobu Inoue 	 */
34682cd038dSYoshinobu Inoue 	u_char *nexthdrp = &ip6->ip6_nxt;
3472cb64cb2SGeorge V. Neville-Neil 	mprev = m;
34882cd038dSYoshinobu Inoue 
34982cd038dSYoshinobu Inoue 	/*
35082cd038dSYoshinobu Inoue 	 * we treat dest2 specially.  this makes IPsec processing
35188ff5695SSUZUKI Shinsuke 	 * much easier.  the goal here is to make mprev point the
35288ff5695SSUZUKI Shinsuke 	 * mbuf prior to dest2.
35382cd038dSYoshinobu Inoue 	 *
35482cd038dSYoshinobu Inoue 	 * result: IPv6 dest2 payload
35582cd038dSYoshinobu Inoue 	 * m and mprev will point to IPv6 header.
35682cd038dSYoshinobu Inoue 	 */
35782cd038dSYoshinobu Inoue 	if (exthdrs.ip6e_dest2) {
35882cd038dSYoshinobu Inoue 		if (!hdrsplit)
35982cd038dSYoshinobu Inoue 			panic("assumption failed: hdr not split");
36082cd038dSYoshinobu Inoue 		exthdrs.ip6e_dest2->m_next = m->m_next;
36182cd038dSYoshinobu Inoue 		m->m_next = exthdrs.ip6e_dest2;
36282cd038dSYoshinobu Inoue 		*mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
36382cd038dSYoshinobu Inoue 		ip6->ip6_nxt = IPPROTO_DSTOPTS;
36482cd038dSYoshinobu Inoue 	}
36582cd038dSYoshinobu Inoue 
36682cd038dSYoshinobu Inoue 	/*
36782cd038dSYoshinobu Inoue 	 * result: IPv6 hbh dest1 rthdr dest2 payload
36882cd038dSYoshinobu Inoue 	 * m will point to IPv6 header.  mprev will point to the
36982cd038dSYoshinobu Inoue 	 * extension header prior to dest2 (rthdr in the above case).
37082cd038dSYoshinobu Inoue 	 */
3717efe5d92SHajimu UMEMOTO 	MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
3727efe5d92SHajimu UMEMOTO 	MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
3737efe5d92SHajimu UMEMOTO 		   IPPROTO_DSTOPTS);
3747efe5d92SHajimu UMEMOTO 	MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
3757efe5d92SHajimu UMEMOTO 		   IPPROTO_ROUTING);
37682cd038dSYoshinobu Inoue 
377b2630c29SGeorge V. Neville-Neil #ifdef IPSEC
37882cd038dSYoshinobu Inoue 	if (!needipsec)
37982cd038dSYoshinobu Inoue 		goto skip_ipsec2;
38082cd038dSYoshinobu Inoue 
38182cd038dSYoshinobu Inoue 	/*
38282cd038dSYoshinobu Inoue 	 * pointers after IPsec headers are not valid any more.
38382cd038dSYoshinobu Inoue 	 * other pointers need a great care too.
38482cd038dSYoshinobu Inoue 	 * (IPsec routines should not mangle mbufs prior to AH/ESP)
38582cd038dSYoshinobu Inoue 	 */
38682cd038dSYoshinobu Inoue 	exthdrs.ip6e_dest2 = NULL;
38782cd038dSYoshinobu Inoue 
38882cd038dSYoshinobu Inoue 	if (exthdrs.ip6e_rthdr) {
38982cd038dSYoshinobu Inoue 		rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *);
39082cd038dSYoshinobu Inoue 		segleft_org = rh->ip6r_segleft;
39182cd038dSYoshinobu Inoue 		rh->ip6r_segleft = 0;
39282cd038dSYoshinobu Inoue 	}
39382cd038dSYoshinobu Inoue 
39482cd038dSYoshinobu Inoue 	bzero(&state, sizeof(state));
39582cd038dSYoshinobu Inoue 	state.m = m;
39682cd038dSYoshinobu Inoue 	error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags,
39782cd038dSYoshinobu Inoue 				    &needipsectun);
39882cd038dSYoshinobu Inoue 	m = state.m;
3999e3bdedeSBjoern A. Zeeb 	if (error == EJUSTRETURN) {
4009e3bdedeSBjoern A. Zeeb 		/*
4019e3bdedeSBjoern A. Zeeb 		 * We had a SP with a level of 'use' and no SA. We
4029e3bdedeSBjoern A. Zeeb 		 * will just continue to process the packet without
4039e3bdedeSBjoern A. Zeeb 		 * IPsec processing.
4049e3bdedeSBjoern A. Zeeb 		 */
4059e3bdedeSBjoern A. Zeeb 		;
4069e3bdedeSBjoern A. Zeeb 	} else if (error) {
40782cd038dSYoshinobu Inoue 		/* mbuf is already reclaimed in ipsec6_output_trans. */
40882cd038dSYoshinobu Inoue 		m = NULL;
40982cd038dSYoshinobu Inoue 		switch (error) {
41082cd038dSYoshinobu Inoue 		case EHOSTUNREACH:
41182cd038dSYoshinobu Inoue 		case ENETUNREACH:
41282cd038dSYoshinobu Inoue 		case EMSGSIZE:
41382cd038dSYoshinobu Inoue 		case ENOBUFS:
41482cd038dSYoshinobu Inoue 		case ENOMEM:
41582cd038dSYoshinobu Inoue 			break;
41682cd038dSYoshinobu Inoue 		default:
41741aa71ddSBjoern A. Zeeb 			printf("[%s:%d] (ipsec): error code %d\n",
41841aa71ddSBjoern A. Zeeb 			    __func__, __LINE__, error);
4197efe5d92SHajimu UMEMOTO 			/* FALLTHROUGH */
42082cd038dSYoshinobu Inoue 		case ENOENT:
42182cd038dSYoshinobu Inoue 			/* don't show these error codes to the user */
42282cd038dSYoshinobu Inoue 			error = 0;
42382cd038dSYoshinobu Inoue 			break;
42482cd038dSYoshinobu Inoue 		}
42582cd038dSYoshinobu Inoue 		goto bad;
4262cb64cb2SGeorge V. Neville-Neil 	} else if (!needipsectun) {
4272cb64cb2SGeorge V. Neville-Neil 		/*
4282cb64cb2SGeorge V. Neville-Neil 		 * In the FAST IPSec case we have already
4292cb64cb2SGeorge V. Neville-Neil 		 * re-injected the packet and it has been freed
4302cb64cb2SGeorge V. Neville-Neil 		 * by the ipsec_done() function.  So, just clean
4312cb64cb2SGeorge V. Neville-Neil 		 * up after ourselves.
4322cb64cb2SGeorge V. Neville-Neil 		 */
4332cb64cb2SGeorge V. Neville-Neil 		m = NULL;
4342cb64cb2SGeorge V. Neville-Neil 		goto done;
43582cd038dSYoshinobu Inoue 	}
43682cd038dSYoshinobu Inoue 	if (exthdrs.ip6e_rthdr) {
43782cd038dSYoshinobu Inoue 		/* ah6_output doesn't modify mbuf chain */
43882cd038dSYoshinobu Inoue 		rh->ip6r_segleft = segleft_org;
43982cd038dSYoshinobu Inoue 	}
44082cd038dSYoshinobu Inoue skip_ipsec2:;
441b2630c29SGeorge V. Neville-Neil #endif /* IPSEC */
44282cd038dSYoshinobu Inoue 
44382cd038dSYoshinobu Inoue 	/*
44471ce264cSWarner Losh 	 * If there is a routing header, discard the packet.
44582cd038dSYoshinobu Inoue 	 */
44682cd038dSYoshinobu Inoue 	if (exthdrs.ip6e_rthdr) {
44782cd038dSYoshinobu Inoue 		 error = EINVAL;
44882cd038dSYoshinobu Inoue 		 goto bad;
44982cd038dSYoshinobu Inoue 	}
45082cd038dSYoshinobu Inoue 
45182cd038dSYoshinobu Inoue 	/* Source address validation */
45282cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
4534ecbe331SSUZUKI Shinsuke 	    (flags & IPV6_UNSPECSRC) == 0) {
45482cd038dSYoshinobu Inoue 		error = EOPNOTSUPP;
455603724d3SBjoern A. Zeeb 		V_ip6stat.ip6s_badscope++;
45682cd038dSYoshinobu Inoue 		goto bad;
45782cd038dSYoshinobu Inoue 	}
45882cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
45982cd038dSYoshinobu Inoue 		error = EOPNOTSUPP;
460603724d3SBjoern A. Zeeb 		V_ip6stat.ip6s_badscope++;
46182cd038dSYoshinobu Inoue 		goto bad;
46282cd038dSYoshinobu Inoue 	}
46382cd038dSYoshinobu Inoue 
464603724d3SBjoern A. Zeeb 	V_ip6stat.ip6s_localout++;
46582cd038dSYoshinobu Inoue 
46682cd038dSYoshinobu Inoue 	/*
46782cd038dSYoshinobu Inoue 	 * Route packet.
46882cd038dSYoshinobu Inoue 	 */
46982cd038dSYoshinobu Inoue 	if (ro == 0) {
47082cd038dSYoshinobu Inoue 		ro = &ip6route;
47182cd038dSYoshinobu Inoue 		bzero((caddr_t)ro, sizeof(*ro));
47282cd038dSYoshinobu Inoue 	}
47382cd038dSYoshinobu Inoue 	ro_pmtu = ro;
47482cd038dSYoshinobu Inoue 	if (opt && opt->ip6po_rthdr)
47582cd038dSYoshinobu Inoue 		ro = &opt->ip6po_route;
47682cd038dSYoshinobu Inoue 	dst = (struct sockaddr_in6 *)&ro->ro_dst;
477*77931dd5SKip Macy #ifdef FLOWTABLE
478*77931dd5SKip Macy 	if (ro == &ip6route) {
479*77931dd5SKip Macy 		struct flentry *fle;
4807efe5d92SHajimu UMEMOTO 
481*77931dd5SKip Macy 		/*
482*77931dd5SKip Macy 		 * The flow table returns route entries valid for up to 30
483*77931dd5SKip Macy 		 * seconds; we rely on the remainder of ip_output() taking no
484*77931dd5SKip Macy 		 * longer than that long for the stability of ro_rt.  The
485*77931dd5SKip Macy 		 * flow ID assignment must have happened before this point.
486*77931dd5SKip Macy 		 */
487*77931dd5SKip Macy 		if ((fle = flowtable_lookup_mbuf(V_ip6_ft, m, AF_INET6)) != NULL) {
488*77931dd5SKip Macy 			flow_to_route_in6(fle, ro);
489*77931dd5SKip Macy 			flevalid = 1;
490*77931dd5SKip Macy 		}
491*77931dd5SKip Macy 	}
492*77931dd5SKip Macy #endif
4938195404bSBrooks Davis again:
49482cd038dSYoshinobu Inoue 	/*
495f95d4633SHajimu UMEMOTO 	 * if specified, try to fill in the traffic class field.
496f95d4633SHajimu UMEMOTO 	 * do not override if a non-zero value is already set.
497f95d4633SHajimu UMEMOTO 	 * we check the diffserv field and the ecn field separately.
498f95d4633SHajimu UMEMOTO 	 */
499f95d4633SHajimu UMEMOTO 	if (opt && opt->ip6po_tclass >= 0) {
500f95d4633SHajimu UMEMOTO 		int mask = 0;
501f95d4633SHajimu UMEMOTO 
502f95d4633SHajimu UMEMOTO 		if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
503f95d4633SHajimu UMEMOTO 			mask |= 0xfc;
504f95d4633SHajimu UMEMOTO 		if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
505f95d4633SHajimu UMEMOTO 			mask |= 0x03;
506f95d4633SHajimu UMEMOTO 		if (mask != 0)
507f95d4633SHajimu UMEMOTO 			ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
508f95d4633SHajimu UMEMOTO 	}
509f95d4633SHajimu UMEMOTO 
510f95d4633SHajimu UMEMOTO 	/* fill in or override the hop limit field, if necessary. */
511f95d4633SHajimu UMEMOTO 	if (opt && opt->ip6po_hlim != -1)
512f95d4633SHajimu UMEMOTO 		ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
513f95d4633SHajimu UMEMOTO 	else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
514f95d4633SHajimu UMEMOTO 		if (im6o != NULL)
515f95d4633SHajimu UMEMOTO 			ip6->ip6_hlim = im6o->im6o_multicast_hlim;
516f95d4633SHajimu UMEMOTO 		else
517603724d3SBjoern A. Zeeb 			ip6->ip6_hlim = V_ip6_defmcasthlim;
518f95d4633SHajimu UMEMOTO 	}
519f95d4633SHajimu UMEMOTO 
520b2630c29SGeorge V. Neville-Neil #ifdef IPSEC
5212cb64cb2SGeorge V. Neville-Neil 	/*
522b2630c29SGeorge V. Neville-Neil 	 * We may re-inject packets into the stack here.
5232cb64cb2SGeorge V. Neville-Neil 	 */
52482cd038dSYoshinobu Inoue 	if (needipsec && needipsectun) {
52582cd038dSYoshinobu Inoue 		struct ipsec_output_state state;
52682cd038dSYoshinobu Inoue 
52782cd038dSYoshinobu Inoue 		/*
52882cd038dSYoshinobu Inoue 		 * All the extension headers will become inaccessible
52982cd038dSYoshinobu Inoue 		 * (since they can be encrypted).
53082cd038dSYoshinobu Inoue 		 * Don't panic, we need no more updates to extension headers
53182cd038dSYoshinobu Inoue 		 * on inner IPv6 packet (since they are now encapsulated).
53282cd038dSYoshinobu Inoue 		 *
53382cd038dSYoshinobu Inoue 		 * IPv6 [ESP|AH] IPv6 [extension headers] payload
53482cd038dSYoshinobu Inoue 		 */
53582cd038dSYoshinobu Inoue 		bzero(&exthdrs, sizeof(exthdrs));
53682cd038dSYoshinobu Inoue 		exthdrs.ip6e_ip6 = m;
53782cd038dSYoshinobu Inoue 
53882cd038dSYoshinobu Inoue 		bzero(&state, sizeof(state));
53982cd038dSYoshinobu Inoue 		state.m = m;
54082cd038dSYoshinobu Inoue 		state.ro = (struct route *)ro;
54182cd038dSYoshinobu Inoue 		state.dst = (struct sockaddr *)dst;
54282cd038dSYoshinobu Inoue 
54382cd038dSYoshinobu Inoue 		error = ipsec6_output_tunnel(&state, sp, flags);
54482cd038dSYoshinobu Inoue 
54582cd038dSYoshinobu Inoue 		m = state.m;
54682cd038dSYoshinobu Inoue 		ro = (struct route_in6 *)state.ro;
54782cd038dSYoshinobu Inoue 		dst = (struct sockaddr_in6 *)state.dst;
5489e3bdedeSBjoern A. Zeeb 		if (error == EJUSTRETURN) {
5499e3bdedeSBjoern A. Zeeb 			/*
5509e3bdedeSBjoern A. Zeeb 			 * We had a SP with a level of 'use' and no SA. We
5519e3bdedeSBjoern A. Zeeb 			 * will just continue to process the packet without
5529e3bdedeSBjoern A. Zeeb 			 * IPsec processing.
5539e3bdedeSBjoern A. Zeeb 			 */
5549e3bdedeSBjoern A. Zeeb 			;
5559e3bdedeSBjoern A. Zeeb 		} else if (error) {
55682cd038dSYoshinobu Inoue 			/* mbuf is already reclaimed in ipsec6_output_tunnel. */
55782cd038dSYoshinobu Inoue 			m0 = m = NULL;
55882cd038dSYoshinobu Inoue 			m = NULL;
55982cd038dSYoshinobu Inoue 			switch (error) {
56082cd038dSYoshinobu Inoue 			case EHOSTUNREACH:
56182cd038dSYoshinobu Inoue 			case ENETUNREACH:
56282cd038dSYoshinobu Inoue 			case EMSGSIZE:
56382cd038dSYoshinobu Inoue 			case ENOBUFS:
56482cd038dSYoshinobu Inoue 			case ENOMEM:
56582cd038dSYoshinobu Inoue 				break;
56682cd038dSYoshinobu Inoue 			default:
56741aa71ddSBjoern A. Zeeb 				printf("[%s:%d] (ipsec): error code %d\n",
56841aa71ddSBjoern A. Zeeb 				    __func__, __LINE__, error);
5697efe5d92SHajimu UMEMOTO 				/* FALLTHROUGH */
57082cd038dSYoshinobu Inoue 			case ENOENT:
57182cd038dSYoshinobu Inoue 				/* don't show these error codes to the user */
57282cd038dSYoshinobu Inoue 				error = 0;
57382cd038dSYoshinobu Inoue 				break;
57482cd038dSYoshinobu Inoue 			}
57582cd038dSYoshinobu Inoue 			goto bad;
5762cb64cb2SGeorge V. Neville-Neil 		} else {
5772cb64cb2SGeorge V. Neville-Neil 			/*
5782cb64cb2SGeorge V. Neville-Neil 			 * In the FAST IPSec case we have already
5792cb64cb2SGeorge V. Neville-Neil 			 * re-injected the packet and it has been freed
5802cb64cb2SGeorge V. Neville-Neil 			 * by the ipsec_done() function.  So, just clean
5812cb64cb2SGeorge V. Neville-Neil 			 * up after ourselves.
5822cb64cb2SGeorge V. Neville-Neil 			 */
5832cb64cb2SGeorge V. Neville-Neil 			m = NULL;
5842cb64cb2SGeorge V. Neville-Neil 			goto done;
58582cd038dSYoshinobu Inoue 		}
58682cd038dSYoshinobu Inoue 
58782cd038dSYoshinobu Inoue 		exthdrs.ip6e_ip6 = m;
58882cd038dSYoshinobu Inoue 	}
589b2630c29SGeorge V. Neville-Neil #endif /* IPSEC */
59082cd038dSYoshinobu Inoue 
591a1f7e5f8SHajimu UMEMOTO 	/* adjust pointer */
592a1f7e5f8SHajimu UMEMOTO 	ip6 = mtod(m, struct ip6_hdr *);
59382cd038dSYoshinobu Inoue 
594a1f7e5f8SHajimu UMEMOTO 	bzero(&dst_sa, sizeof(dst_sa));
595a1f7e5f8SHajimu UMEMOTO 	dst_sa.sin6_family = AF_INET6;
596a1f7e5f8SHajimu UMEMOTO 	dst_sa.sin6_len = sizeof(dst_sa);
597a1f7e5f8SHajimu UMEMOTO 	dst_sa.sin6_addr = ip6->ip6_dst;
598*77931dd5SKip Macy 	if (flevalid) {
599*77931dd5SKip Macy 		rt = ro->ro_rt;
600*77931dd5SKip Macy 		ifp = ro->ro_rt->rt_ifp;
601*77931dd5SKip Macy 	} else if ((error = in6_selectroute(&dst_sa, opt, im6o, ro,
6026e6b3f7cSQing Li 	    &ifp, &rt)) != 0) {
603a1f7e5f8SHajimu UMEMOTO 		switch (error) {
604a1f7e5f8SHajimu UMEMOTO 		case EHOSTUNREACH:
605603724d3SBjoern A. Zeeb 			V_ip6stat.ip6s_noroute++;
606a1f7e5f8SHajimu UMEMOTO 			break;
607a1f7e5f8SHajimu UMEMOTO 		case EADDRNOTAVAIL:
608a1f7e5f8SHajimu UMEMOTO 		default:
609a1f7e5f8SHajimu UMEMOTO 			break; /* XXX statistics? */
61082cd038dSYoshinobu Inoue 		}
611a1f7e5f8SHajimu UMEMOTO 		if (ifp != NULL)
61282cd038dSYoshinobu Inoue 			in6_ifstat_inc(ifp, ifs6_out_discard);
61382cd038dSYoshinobu Inoue 		goto bad;
61482cd038dSYoshinobu Inoue 	}
615a1f7e5f8SHajimu UMEMOTO 	if (rt == NULL) {
616a1f7e5f8SHajimu UMEMOTO 		/*
617a1f7e5f8SHajimu UMEMOTO 		 * If in6_selectroute() does not return a route entry,
618a1f7e5f8SHajimu UMEMOTO 		 * dst may not have been updated.
619a1f7e5f8SHajimu UMEMOTO 		 */
620a1f7e5f8SHajimu UMEMOTO 		*dst = dst_sa;	/* XXX */
62182cd038dSYoshinobu Inoue 	}
62282cd038dSYoshinobu Inoue 
623a1f7e5f8SHajimu UMEMOTO 	/*
624a1f7e5f8SHajimu UMEMOTO 	 * then rt (for unicast) and ifp must be non-NULL valid values.
625a1f7e5f8SHajimu UMEMOTO 	 */
626a1f7e5f8SHajimu UMEMOTO 	if ((flags & IPV6_FORWARDING) == 0) {
627a1f7e5f8SHajimu UMEMOTO 		/* XXX: the FORWARDING flag can be set for mrouting. */
628a1f7e5f8SHajimu UMEMOTO 		in6_ifstat_inc(ifp, ifs6_out_request);
629a1f7e5f8SHajimu UMEMOTO 	}
630a1f7e5f8SHajimu UMEMOTO 	if (rt != NULL) {
631a1f7e5f8SHajimu UMEMOTO 		ia = (struct in6_ifaddr *)(rt->rt_ifa);
632a1f7e5f8SHajimu UMEMOTO 		rt->rt_use++;
633a1f7e5f8SHajimu UMEMOTO 	}
634a1f7e5f8SHajimu UMEMOTO 
6359452b0d2SQing Li 
636a1f7e5f8SHajimu UMEMOTO 	/*
637a1f7e5f8SHajimu UMEMOTO 	 * The outgoing interface must be in the zone of source and
6389452b0d2SQing Li 	 * destination addresses.
639a1f7e5f8SHajimu UMEMOTO 	 */
640a1f7e5f8SHajimu UMEMOTO 	origifp = ifp;
641a1f7e5f8SHajimu UMEMOTO 
642a1f7e5f8SHajimu UMEMOTO 	src0 = ip6->ip6_src;
643a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&src0, origifp, &zone))
644a1f7e5f8SHajimu UMEMOTO 		goto badscope;
645a1f7e5f8SHajimu UMEMOTO 	bzero(&src_sa, sizeof(src_sa));
646a1f7e5f8SHajimu UMEMOTO 	src_sa.sin6_family = AF_INET6;
647a1f7e5f8SHajimu UMEMOTO 	src_sa.sin6_len = sizeof(src_sa);
648a1f7e5f8SHajimu UMEMOTO 	src_sa.sin6_addr = ip6->ip6_src;
649a1f7e5f8SHajimu UMEMOTO 	if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
650a1f7e5f8SHajimu UMEMOTO 		goto badscope;
651a1f7e5f8SHajimu UMEMOTO 
652a1f7e5f8SHajimu UMEMOTO 	dst0 = ip6->ip6_dst;
653a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&dst0, origifp, &zone))
654a1f7e5f8SHajimu UMEMOTO 		goto badscope;
655a1f7e5f8SHajimu UMEMOTO 	/* re-initialize to be sure */
656a1f7e5f8SHajimu UMEMOTO 	bzero(&dst_sa, sizeof(dst_sa));
657a1f7e5f8SHajimu UMEMOTO 	dst_sa.sin6_family = AF_INET6;
658a1f7e5f8SHajimu UMEMOTO 	dst_sa.sin6_len = sizeof(dst_sa);
659a1f7e5f8SHajimu UMEMOTO 	dst_sa.sin6_addr = ip6->ip6_dst;
660a1f7e5f8SHajimu UMEMOTO 	if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) {
661a1f7e5f8SHajimu UMEMOTO 		goto badscope;
662a1f7e5f8SHajimu UMEMOTO 	}
663a1f7e5f8SHajimu UMEMOTO 
6649452b0d2SQing Li 	/* We should use ia_ifp to support the case of
6659452b0d2SQing Li 	 * sending packets to an address of our own.
6669452b0d2SQing Li 	 */
6679452b0d2SQing Li 	if (ia != NULL && ia->ia_ifp)
6689452b0d2SQing Li 		ifp = ia->ia_ifp;
6699452b0d2SQing Li 
670a1f7e5f8SHajimu UMEMOTO 	/* scope check is done. */
671a1f7e5f8SHajimu UMEMOTO 	goto routefound;
672a1f7e5f8SHajimu UMEMOTO 
673a1f7e5f8SHajimu UMEMOTO   badscope:
674603724d3SBjoern A. Zeeb 	V_ip6stat.ip6s_badscope++;
675a1f7e5f8SHajimu UMEMOTO 	in6_ifstat_inc(origifp, ifs6_out_discard);
676a1f7e5f8SHajimu UMEMOTO 	if (error == 0)
677a1f7e5f8SHajimu UMEMOTO 		error = EHOSTUNREACH; /* XXX */
678a1f7e5f8SHajimu UMEMOTO 	goto bad;
679a1f7e5f8SHajimu UMEMOTO 
680a1f7e5f8SHajimu UMEMOTO   routefound:
681a1f7e5f8SHajimu UMEMOTO 	if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
682a1f7e5f8SHajimu UMEMOTO 		if (opt && opt->ip6po_nextroute.ro_rt) {
683a1f7e5f8SHajimu UMEMOTO 			/*
684a1f7e5f8SHajimu UMEMOTO 			 * The nexthop is explicitly specified by the
685a1f7e5f8SHajimu UMEMOTO 			 * application.  We assume the next hop is an IPv6
686a1f7e5f8SHajimu UMEMOTO 			 * address.
687a1f7e5f8SHajimu UMEMOTO 			 */
688a1f7e5f8SHajimu UMEMOTO 			dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
689a1f7e5f8SHajimu UMEMOTO 		}
690a1f7e5f8SHajimu UMEMOTO 		else if ((rt->rt_flags & RTF_GATEWAY))
691a1f7e5f8SHajimu UMEMOTO 			dst = (struct sockaddr_in6 *)rt->rt_gateway;
692a1f7e5f8SHajimu UMEMOTO 	}
693a1f7e5f8SHajimu UMEMOTO 
694a1f7e5f8SHajimu UMEMOTO 	if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
695a1f7e5f8SHajimu UMEMOTO 		m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
69682cd038dSYoshinobu Inoue 	} else {
69782cd038dSYoshinobu Inoue 		m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
69882cd038dSYoshinobu Inoue 		in6_ifstat_inc(ifp, ifs6_out_mcast);
69982cd038dSYoshinobu Inoue 		/*
70082cd038dSYoshinobu Inoue 		 * Confirm that the outgoing interface supports multicast.
70182cd038dSYoshinobu Inoue 		 */
702a1f7e5f8SHajimu UMEMOTO 		if (!(ifp->if_flags & IFF_MULTICAST)) {
703603724d3SBjoern A. Zeeb 			V_ip6stat.ip6s_noroute++;
70482cd038dSYoshinobu Inoue 			in6_ifstat_inc(ifp, ifs6_out_discard);
70582cd038dSYoshinobu Inoue 			error = ENETUNREACH;
70682cd038dSYoshinobu Inoue 			goto bad;
70782cd038dSYoshinobu Inoue 		}
70833cde130SBruce M Simpson 		if ((im6o == NULL && in6_mcast_loop) ||
70933cde130SBruce M Simpson 		    (im6o && im6o->im6o_multicast_loop)) {
71082cd038dSYoshinobu Inoue 			/*
71133cde130SBruce M Simpson 			 * Loop back multicast datagram if not expressly
71233cde130SBruce M Simpson 			 * forbidden to do so, even if we have not joined
71333cde130SBruce M Simpson 			 * the address; protocols will filter it later,
71433cde130SBruce M Simpson 			 * thus deferring a hash lookup and lock acquisition
71533cde130SBruce M Simpson 			 * at the expense of an m_copym().
71682cd038dSYoshinobu Inoue 			 */
71782cd038dSYoshinobu Inoue 			ip6_mloopback(ifp, m, dst);
71891ec0a1eSYoshinobu Inoue 		} else {
71991ec0a1eSYoshinobu Inoue 			/*
72091ec0a1eSYoshinobu Inoue 			 * If we are acting as a multicast router, perform
72191ec0a1eSYoshinobu Inoue 			 * multicast forwarding as if the packet had just
72291ec0a1eSYoshinobu Inoue 			 * arrived on the interface to which we are about
72391ec0a1eSYoshinobu Inoue 			 * to send.  The multicast forwarding function
72491ec0a1eSYoshinobu Inoue 			 * recursively calls this function, using the
72591ec0a1eSYoshinobu Inoue 			 * IPV6_FORWARDING flag to prevent infinite recursion.
72691ec0a1eSYoshinobu Inoue 			 *
72791ec0a1eSYoshinobu Inoue 			 * Multicasts that are looped back by ip6_mloopback(),
72891ec0a1eSYoshinobu Inoue 			 * above, will be forwarded by the ip6_input() routine,
72991ec0a1eSYoshinobu Inoue 			 * if necessary.
73091ec0a1eSYoshinobu Inoue 			 */
73133cde130SBruce M Simpson 			if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
732a1f7e5f8SHajimu UMEMOTO 				/*
733a1f7e5f8SHajimu UMEMOTO 				 * XXX: ip6_mforward expects that rcvif is NULL
734a1f7e5f8SHajimu UMEMOTO 				 * when it is called from the originating path.
735a1f7e5f8SHajimu UMEMOTO 				 * However, it is not always the case, since
736a1f7e5f8SHajimu UMEMOTO 				 * some versions of MGETHDR() does not
737a1f7e5f8SHajimu UMEMOTO 				 * initialize the field.
738a1f7e5f8SHajimu UMEMOTO 				 */
739a1f7e5f8SHajimu UMEMOTO 				m->m_pkthdr.rcvif = NULL;
740686cdd19SJun-ichiro itojun Hagino 				if (ip6_mforward(ip6, ifp, m) != 0) {
74191ec0a1eSYoshinobu Inoue 					m_freem(m);
74291ec0a1eSYoshinobu Inoue 					goto done;
74391ec0a1eSYoshinobu Inoue 				}
74491ec0a1eSYoshinobu Inoue 			}
74582cd038dSYoshinobu Inoue 		}
74682cd038dSYoshinobu Inoue 		/*
74782cd038dSYoshinobu Inoue 		 * Multicasts with a hoplimit of zero may be looped back,
74882cd038dSYoshinobu Inoue 		 * above, but must not be transmitted on a network.
74982cd038dSYoshinobu Inoue 		 * Also, multicasts addressed to the loopback interface
75082cd038dSYoshinobu Inoue 		 * are not sent -- the above call to ip6_mloopback() will
75182cd038dSYoshinobu Inoue 		 * loop back a copy if this host actually belongs to the
75282cd038dSYoshinobu Inoue 		 * destination group on the loopback interface.
75382cd038dSYoshinobu Inoue 		 */
754f95d4633SHajimu UMEMOTO 		if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
755f95d4633SHajimu UMEMOTO 		    IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
75682cd038dSYoshinobu Inoue 			m_freem(m);
75782cd038dSYoshinobu Inoue 			goto done;
75882cd038dSYoshinobu Inoue 		}
75982cd038dSYoshinobu Inoue 	}
76082cd038dSYoshinobu Inoue 
76182cd038dSYoshinobu Inoue 	/*
76282cd038dSYoshinobu Inoue 	 * Fill the outgoing inteface to tell the upper layer
76382cd038dSYoshinobu Inoue 	 * to increment per-interface statistics.
76482cd038dSYoshinobu Inoue 	 */
76582cd038dSYoshinobu Inoue 	if (ifpp)
76682cd038dSYoshinobu Inoue 		*ifpp = ifp;
76782cd038dSYoshinobu Inoue 
76831b3783cSHajimu UMEMOTO 	/* Determine path MTU. */
769f95d4633SHajimu UMEMOTO 	if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu,
770f95d4633SHajimu UMEMOTO 	    &alwaysfrag)) != 0)
77131b3783cSHajimu UMEMOTO 		goto bad;
77282cd038dSYoshinobu Inoue 
77333841545SHajimu UMEMOTO 	/*
7748b00e59dSHajimu UMEMOTO 	 * The caller of this function may specify to use the minimum MTU
7758b00e59dSHajimu UMEMOTO 	 * in some cases.
7768b00e59dSHajimu UMEMOTO 	 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
7778b00e59dSHajimu UMEMOTO 	 * setting.  The logic is a bit complicated; by default, unicast
7788b00e59dSHajimu UMEMOTO 	 * packets will follow path MTU while multicast packets will be sent at
7798b00e59dSHajimu UMEMOTO 	 * the minimum MTU.  If IP6PO_MINMTU_ALL is specified, all packets
7808b00e59dSHajimu UMEMOTO 	 * including unicast ones will be sent at the minimum MTU.  Multicast
7818b00e59dSHajimu UMEMOTO 	 * packets will always be sent at the minimum MTU unless
7828b00e59dSHajimu UMEMOTO 	 * IP6PO_MINMTU_DISABLE is explicitly specified.
7838b00e59dSHajimu UMEMOTO 	 * See RFC 3542 for more details.
78433841545SHajimu UMEMOTO 	 */
7858b00e59dSHajimu UMEMOTO 	if (mtu > IPV6_MMTU) {
7868b00e59dSHajimu UMEMOTO 		if ((flags & IPV6_MINMTU))
78733841545SHajimu UMEMOTO 			mtu = IPV6_MMTU;
7888b00e59dSHajimu UMEMOTO 		else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
7898b00e59dSHajimu UMEMOTO 			mtu = IPV6_MMTU;
7908b00e59dSHajimu UMEMOTO 		else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
7918b00e59dSHajimu UMEMOTO 			 (opt == NULL ||
7928b00e59dSHajimu UMEMOTO 			  opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
7938b00e59dSHajimu UMEMOTO 			mtu = IPV6_MMTU;
7948b00e59dSHajimu UMEMOTO 		}
7958b00e59dSHajimu UMEMOTO 	}
79633841545SHajimu UMEMOTO 
79733841545SHajimu UMEMOTO 	/*
79833841545SHajimu UMEMOTO 	 * clear embedded scope identifiers if necessary.
79933841545SHajimu UMEMOTO 	 * in6_clearscope will touch the addresses only when necessary.
80033841545SHajimu UMEMOTO 	 */
80133841545SHajimu UMEMOTO 	in6_clearscope(&ip6->ip6_src);
80233841545SHajimu UMEMOTO 	in6_clearscope(&ip6->ip6_dst);
80382cd038dSYoshinobu Inoue 
80482cd038dSYoshinobu Inoue 	/*
80582cd038dSYoshinobu Inoue 	 * If the outgoing packet contains a hop-by-hop options header,
80682cd038dSYoshinobu Inoue 	 * it must be examined and processed even by the source node.
80782cd038dSYoshinobu Inoue 	 * (RFC 2460, section 4.)
80882cd038dSYoshinobu Inoue 	 */
80982cd038dSYoshinobu Inoue 	if (exthdrs.ip6e_hbh) {
81033841545SHajimu UMEMOTO 		struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
811283f9f8aSHajimu UMEMOTO 		u_int32_t dummy; /* XXX unused */
812283f9f8aSHajimu UMEMOTO 		u_int32_t plen = 0; /* XXX: ip6_process will check the value */
81382cd038dSYoshinobu Inoue 
81433841545SHajimu UMEMOTO #ifdef DIAGNOSTIC
81533841545SHajimu UMEMOTO 		if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
81633841545SHajimu UMEMOTO 			panic("ip6e_hbh is not continuous");
81733841545SHajimu UMEMOTO #endif
81882cd038dSYoshinobu Inoue 		/*
81982cd038dSYoshinobu Inoue 		 *  XXX: if we have to send an ICMPv6 error to the sender,
82082cd038dSYoshinobu Inoue 		 *       we need the M_LOOP flag since icmp6_error() expects
82182cd038dSYoshinobu Inoue 		 *       the IPv6 and the hop-by-hop options header are
82282cd038dSYoshinobu Inoue 		 *       continuous unless the flag is set.
82382cd038dSYoshinobu Inoue 		 */
82482cd038dSYoshinobu Inoue 		m->m_flags |= M_LOOP;
82582cd038dSYoshinobu Inoue 		m->m_pkthdr.rcvif = ifp;
8267efe5d92SHajimu UMEMOTO 		if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
8277efe5d92SHajimu UMEMOTO 		    ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
828283f9f8aSHajimu UMEMOTO 		    &dummy, &plen) < 0) {
82982cd038dSYoshinobu Inoue 			/* m was already freed at this point */
83082cd038dSYoshinobu Inoue 			error = EINVAL;/* better error? */
83182cd038dSYoshinobu Inoue 			goto done;
83282cd038dSYoshinobu Inoue 		}
83382cd038dSYoshinobu Inoue 		m->m_flags &= ~M_LOOP; /* XXX */
83482cd038dSYoshinobu Inoue 		m->m_pkthdr.rcvif = NULL;
83582cd038dSYoshinobu Inoue 	}
83682cd038dSYoshinobu Inoue 
837c21fd232SAndre Oppermann 	/* Jump over all PFIL processing if hooks are not active. */
8380b4b0b0fSJulian Elischer 	if (!PFIL_HOOKED(&V_inet6_pfil_hook))
839c21fd232SAndre Oppermann 		goto passout;
840c21fd232SAndre Oppermann 
8418195404bSBrooks Davis 	odst = ip6->ip6_dst;
842c21fd232SAndre Oppermann 	/* Run through list of hooks for output packets. */
8430b4b0b0fSJulian Elischer 	error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp);
844b140bc1fSSam Leffler 	if (error != 0 || m == NULL)
845c4ac87eaSDarren Reed 		goto done;
846c4ac87eaSDarren Reed 	ip6 = mtod(m, struct ip6_hdr *);
8477efe5d92SHajimu UMEMOTO 
8488195404bSBrooks Davis 	/* See if destination IP address was changed by packet filter. */
8498195404bSBrooks Davis 	if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
8508195404bSBrooks Davis 		m->m_flags |= M_SKIP_FIREWALL;
8518195404bSBrooks Davis 		/* If destination is now ourself drop to ip6_input(). */
8528195404bSBrooks Davis 		if (in6_localaddr(&ip6->ip6_dst)) {
8538195404bSBrooks Davis 			if (m->m_pkthdr.rcvif == NULL)
854603724d3SBjoern A. Zeeb 				m->m_pkthdr.rcvif = V_loif;
8558195404bSBrooks Davis 			if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
8568195404bSBrooks Davis 				m->m_pkthdr.csum_flags |=
8578195404bSBrooks Davis 				    CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
8588195404bSBrooks Davis 				m->m_pkthdr.csum_data = 0xffff;
8598195404bSBrooks Davis 			}
8608195404bSBrooks Davis 			m->m_pkthdr.csum_flags |=
8618195404bSBrooks Davis 			    CSUM_IP_CHECKED | CSUM_IP_VALID;
8629b03990aSRandall Stewart #ifdef SCTP
8639b03990aSRandall Stewart 			if (m->m_pkthdr.csum_flags & CSUM_SCTP)
8649b03990aSRandall Stewart 				m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
8659b03990aSRandall Stewart #endif
8668195404bSBrooks Davis 			error = netisr_queue(NETISR_IPV6, m);
8678195404bSBrooks Davis 			goto done;
8688195404bSBrooks Davis 		} else
8698195404bSBrooks Davis 			goto again;	/* Redo the routing table lookup. */
8708195404bSBrooks Davis 	}
8718195404bSBrooks Davis 
8728195404bSBrooks Davis 	/* XXX: IPFIREWALL_FORWARD */
8738195404bSBrooks Davis 
874c21fd232SAndre Oppermann passout:
87582cd038dSYoshinobu Inoue 	/*
87682cd038dSYoshinobu Inoue 	 * Send the packet to the outgoing interface.
87782cd038dSYoshinobu Inoue 	 * If necessary, do IPv6 fragmentation before sending.
878f95d4633SHajimu UMEMOTO 	 *
879f95d4633SHajimu UMEMOTO 	 * the logic here is rather complex:
880f95d4633SHajimu UMEMOTO 	 * 1: normal case (dontfrag == 0, alwaysfrag == 0)
881f95d4633SHajimu UMEMOTO 	 * 1-a:	send as is if tlen <= path mtu
882f95d4633SHajimu UMEMOTO 	 * 1-b:	fragment if tlen > path mtu
883f95d4633SHajimu UMEMOTO 	 *
884f95d4633SHajimu UMEMOTO 	 * 2: if user asks us not to fragment (dontfrag == 1)
885f95d4633SHajimu UMEMOTO 	 * 2-a:	send as is if tlen <= interface mtu
886f95d4633SHajimu UMEMOTO 	 * 2-b:	error if tlen > interface mtu
887f95d4633SHajimu UMEMOTO 	 *
888f95d4633SHajimu UMEMOTO 	 * 3: if we always need to attach fragment header (alwaysfrag == 1)
889f95d4633SHajimu UMEMOTO 	 *	always fragment
890f95d4633SHajimu UMEMOTO 	 *
891f95d4633SHajimu UMEMOTO 	 * 4: if dontfrag == 1 && alwaysfrag == 1
892f95d4633SHajimu UMEMOTO 	 *	error, as we cannot handle this conflicting request
89382cd038dSYoshinobu Inoue 	 */
8949b03990aSRandall Stewart #ifdef SCTP
8959b03990aSRandall Stewart 	sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist;
8969b03990aSRandall Stewart 	if (sw_csum & CSUM_SCTP) {
8971966e5b5SRandall Stewart 		sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
8989b03990aSRandall Stewart 		sw_csum &= ~CSUM_SCTP;
8999b03990aSRandall Stewart 	}
9009b03990aSRandall Stewart #endif
90182cd038dSYoshinobu Inoue 	tlen = m->m_pkthdr.len;
90282cd038dSYoshinobu Inoue 
903f95d4633SHajimu UMEMOTO 	if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG))
904f95d4633SHajimu UMEMOTO 		dontfrag = 1;
905f95d4633SHajimu UMEMOTO 	else
906f95d4633SHajimu UMEMOTO 		dontfrag = 0;
907f95d4633SHajimu UMEMOTO 	if (dontfrag && alwaysfrag) {	/* case 4 */
908f95d4633SHajimu UMEMOTO 		/* conflicting request - can't transmit */
909f95d4633SHajimu UMEMOTO 		error = EMSGSIZE;
910f95d4633SHajimu UMEMOTO 		goto bad;
911f95d4633SHajimu UMEMOTO 	}
912f95d4633SHajimu UMEMOTO 	if (dontfrag && tlen > IN6_LINKMTU(ifp)) {	/* case 2-b */
913f95d4633SHajimu UMEMOTO 		/*
914f95d4633SHajimu UMEMOTO 		 * Even if the DONTFRAG option is specified, we cannot send the
915f95d4633SHajimu UMEMOTO 		 * packet when the data length is larger than the MTU of the
916f95d4633SHajimu UMEMOTO 		 * outgoing interface.
917f95d4633SHajimu UMEMOTO 		 * Notify the error by sending IPV6_PATHMTU ancillary data as
918f95d4633SHajimu UMEMOTO 		 * well as returning an error code (the latter is not described
919f95d4633SHajimu UMEMOTO 		 * in the API spec.)
920f95d4633SHajimu UMEMOTO 		 */
921f95d4633SHajimu UMEMOTO 		u_int32_t mtu32;
922f95d4633SHajimu UMEMOTO 		struct ip6ctlparam ip6cp;
923f95d4633SHajimu UMEMOTO 
924f95d4633SHajimu UMEMOTO 		mtu32 = (u_int32_t)mtu;
925f95d4633SHajimu UMEMOTO 		bzero(&ip6cp, sizeof(ip6cp));
926f95d4633SHajimu UMEMOTO 		ip6cp.ip6c_cmdarg = (void *)&mtu32;
927f95d4633SHajimu UMEMOTO 		pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
928f95d4633SHajimu UMEMOTO 		    (void *)&ip6cp);
929f95d4633SHajimu UMEMOTO 
930f95d4633SHajimu UMEMOTO 		error = EMSGSIZE;
931f95d4633SHajimu UMEMOTO 		goto bad;
932f95d4633SHajimu UMEMOTO 	}
933f95d4633SHajimu UMEMOTO 
934f95d4633SHajimu UMEMOTO 	/*
935f95d4633SHajimu UMEMOTO 	 * transmit packet without fragmentation
936f95d4633SHajimu UMEMOTO 	 */
937f95d4633SHajimu UMEMOTO 	if (dontfrag || (!alwaysfrag && tlen <= mtu)) {	/* case 1-a and 2-a */
938f95d4633SHajimu UMEMOTO 		struct in6_ifaddr *ia6;
939f95d4633SHajimu UMEMOTO 
940f95d4633SHajimu UMEMOTO 		ip6 = mtod(m, struct ip6_hdr *);
941f95d4633SHajimu UMEMOTO 		ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
942f95d4633SHajimu UMEMOTO 		if (ia6) {
9435da9f8faSJosef Karthauser 			/* Record statistics for this interface address. */
944f95d4633SHajimu UMEMOTO 			ia6->ia_ifa.if_opackets++;
945f95d4633SHajimu UMEMOTO 			ia6->ia_ifa.if_obytes += m->m_pkthdr.len;
9468c0fec80SRobert Watson 			ifa_free(&ia6->ia_ifa);
9475da9f8faSJosef Karthauser 		}
948686cdd19SJun-ichiro itojun Hagino 		error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
94982cd038dSYoshinobu Inoue 		goto done;
950f95d4633SHajimu UMEMOTO 	}
951f95d4633SHajimu UMEMOTO 
95282cd038dSYoshinobu Inoue 	/*
953f95d4633SHajimu UMEMOTO 	 * try to fragment the packet.  case 1-b and 3
95482cd038dSYoshinobu Inoue 	 */
955f95d4633SHajimu UMEMOTO 	if (mtu < IPV6_MMTU) {
956f95d4633SHajimu UMEMOTO 		/* path MTU cannot be less than IPV6_MMTU */
95782cd038dSYoshinobu Inoue 		error = EMSGSIZE;
95882cd038dSYoshinobu Inoue 		in6_ifstat_inc(ifp, ifs6_out_fragfail);
95982cd038dSYoshinobu Inoue 		goto bad;
9607efe5d92SHajimu UMEMOTO 	} else if (ip6->ip6_plen == 0) {
9617efe5d92SHajimu UMEMOTO 		/* jumbo payload cannot be fragmented */
96282cd038dSYoshinobu Inoue 		error = EMSGSIZE;
96382cd038dSYoshinobu Inoue 		in6_ifstat_inc(ifp, ifs6_out_fragfail);
96482cd038dSYoshinobu Inoue 		goto bad;
96582cd038dSYoshinobu Inoue 	} else {
96682cd038dSYoshinobu Inoue 		struct mbuf **mnext, *m_frgpart;
96782cd038dSYoshinobu Inoue 		struct ip6_frag *ip6f;
9688373d51dSHajimu UMEMOTO 		u_int32_t id = htonl(ip6_randomid());
96982cd038dSYoshinobu Inoue 		u_char nextproto;
9702cb64cb2SGeorge V. Neville-Neil 
9716f8aee22SBill Paul 		int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len;
97282cd038dSYoshinobu Inoue 
97382cd038dSYoshinobu Inoue 		/*
97482cd038dSYoshinobu Inoue 		 * Too large for the destination or interface;
97582cd038dSYoshinobu Inoue 		 * fragment if possible.
97682cd038dSYoshinobu Inoue 		 * Must be able to put at least 8 bytes per fragment.
97782cd038dSYoshinobu Inoue 		 */
97882cd038dSYoshinobu Inoue 		hlen = unfragpartlen;
97982cd038dSYoshinobu Inoue 		if (mtu > IPV6_MAXPACKET)
98082cd038dSYoshinobu Inoue 			mtu = IPV6_MAXPACKET;
98133841545SHajimu UMEMOTO 
98282cd038dSYoshinobu Inoue 		len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
98382cd038dSYoshinobu Inoue 		if (len < 8) {
98482cd038dSYoshinobu Inoue 			error = EMSGSIZE;
98582cd038dSYoshinobu Inoue 			in6_ifstat_inc(ifp, ifs6_out_fragfail);
98682cd038dSYoshinobu Inoue 			goto bad;
98782cd038dSYoshinobu Inoue 		}
98882cd038dSYoshinobu Inoue 
9896f8aee22SBill Paul 		/*
9906f8aee22SBill Paul 		 * Verify that we have any chance at all of being able to queue
9916f8aee22SBill Paul 		 *      the packet or packet fragments
9926f8aee22SBill Paul 		 */
9936f8aee22SBill Paul 		if (qslots <= 0 || ((u_int)qslots * (mtu - hlen)
9946f8aee22SBill Paul 		    < tlen  /* - hlen */)) {
9956f8aee22SBill Paul 			error = ENOBUFS;
996603724d3SBjoern A. Zeeb 			V_ip6stat.ip6s_odropped++;
9976f8aee22SBill Paul 			goto bad;
9986f8aee22SBill Paul 		}
9996f8aee22SBill Paul 
100082cd038dSYoshinobu Inoue 		mnext = &m->m_nextpkt;
100182cd038dSYoshinobu Inoue 
100282cd038dSYoshinobu Inoue 		/*
100382cd038dSYoshinobu Inoue 		 * Change the next header field of the last header in the
100482cd038dSYoshinobu Inoue 		 * unfragmentable part.
100582cd038dSYoshinobu Inoue 		 */
100682cd038dSYoshinobu Inoue 		if (exthdrs.ip6e_rthdr) {
100782cd038dSYoshinobu Inoue 			nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
100882cd038dSYoshinobu Inoue 			*mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
100982cd038dSYoshinobu Inoue 		} else if (exthdrs.ip6e_dest1) {
101082cd038dSYoshinobu Inoue 			nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
101182cd038dSYoshinobu Inoue 			*mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
101282cd038dSYoshinobu Inoue 		} else if (exthdrs.ip6e_hbh) {
101382cd038dSYoshinobu Inoue 			nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
101482cd038dSYoshinobu Inoue 			*mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
101582cd038dSYoshinobu Inoue 		} else {
101682cd038dSYoshinobu Inoue 			nextproto = ip6->ip6_nxt;
101782cd038dSYoshinobu Inoue 			ip6->ip6_nxt = IPPROTO_FRAGMENT;
101882cd038dSYoshinobu Inoue 		}
101982cd038dSYoshinobu Inoue 
102082cd038dSYoshinobu Inoue 		/*
102182cd038dSYoshinobu Inoue 		 * Loop through length of segment after first fragment,
102288ff5695SSUZUKI Shinsuke 		 * make new header and copy data of each part and link onto
102388ff5695SSUZUKI Shinsuke 		 * chain.
102482cd038dSYoshinobu Inoue 		 */
102582cd038dSYoshinobu Inoue 		m0 = m;
102682cd038dSYoshinobu Inoue 		for (off = hlen; off < tlen; off += len) {
1027a163d034SWarner Losh 			MGETHDR(m, M_DONTWAIT, MT_HEADER);
102882cd038dSYoshinobu Inoue 			if (!m) {
102982cd038dSYoshinobu Inoue 				error = ENOBUFS;
1030603724d3SBjoern A. Zeeb 				V_ip6stat.ip6s_odropped++;
103182cd038dSYoshinobu Inoue 				goto sendorfree;
103282cd038dSYoshinobu Inoue 			}
103333841545SHajimu UMEMOTO 			m->m_pkthdr.rcvif = NULL;
103482cd038dSYoshinobu Inoue 			m->m_flags = m0->m_flags & M_COPYFLAGS;
103582cd038dSYoshinobu Inoue 			*mnext = m;
103682cd038dSYoshinobu Inoue 			mnext = &m->m_nextpkt;
103782cd038dSYoshinobu Inoue 			m->m_data += max_linkhdr;
103882cd038dSYoshinobu Inoue 			mhip6 = mtod(m, struct ip6_hdr *);
103982cd038dSYoshinobu Inoue 			*mhip6 = *ip6;
104082cd038dSYoshinobu Inoue 			m->m_len = sizeof(*mhip6);
104182cd038dSYoshinobu Inoue 			error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
104282cd038dSYoshinobu Inoue 			if (error) {
1043603724d3SBjoern A. Zeeb 				V_ip6stat.ip6s_odropped++;
104482cd038dSYoshinobu Inoue 				goto sendorfree;
104582cd038dSYoshinobu Inoue 			}
104682cd038dSYoshinobu Inoue 			ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
104782cd038dSYoshinobu Inoue 			if (off + len >= tlen)
104882cd038dSYoshinobu Inoue 				len = tlen - off;
104982cd038dSYoshinobu Inoue 			else
105082cd038dSYoshinobu Inoue 				ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
105182cd038dSYoshinobu Inoue 			mhip6->ip6_plen = htons((u_short)(len + hlen +
10527efe5d92SHajimu UMEMOTO 			    sizeof(*ip6f) - sizeof(struct ip6_hdr)));
105382cd038dSYoshinobu Inoue 			if ((m_frgpart = m_copy(m0, off, len)) == 0) {
105482cd038dSYoshinobu Inoue 				error = ENOBUFS;
1055603724d3SBjoern A. Zeeb 				V_ip6stat.ip6s_odropped++;
105682cd038dSYoshinobu Inoue 				goto sendorfree;
105782cd038dSYoshinobu Inoue 			}
105882cd038dSYoshinobu Inoue 			m_cat(m, m_frgpart);
105982cd038dSYoshinobu Inoue 			m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
1060fc74a9f9SBrooks Davis 			m->m_pkthdr.rcvif = NULL;
106182cd038dSYoshinobu Inoue 			ip6f->ip6f_reserved = 0;
106282cd038dSYoshinobu Inoue 			ip6f->ip6f_ident = id;
106382cd038dSYoshinobu Inoue 			ip6f->ip6f_nxt = nextproto;
1064603724d3SBjoern A. Zeeb 			V_ip6stat.ip6s_ofragments++;
106582cd038dSYoshinobu Inoue 			in6_ifstat_inc(ifp, ifs6_out_fragcreat);
106682cd038dSYoshinobu Inoue 		}
106782cd038dSYoshinobu Inoue 
106882cd038dSYoshinobu Inoue 		in6_ifstat_inc(ifp, ifs6_out_fragok);
106982cd038dSYoshinobu Inoue 	}
107082cd038dSYoshinobu Inoue 
107182cd038dSYoshinobu Inoue 	/*
107282cd038dSYoshinobu Inoue 	 * Remove leading garbages.
107382cd038dSYoshinobu Inoue 	 */
107482cd038dSYoshinobu Inoue sendorfree:
107582cd038dSYoshinobu Inoue 	m = m0->m_nextpkt;
107682cd038dSYoshinobu Inoue 	m0->m_nextpkt = 0;
107782cd038dSYoshinobu Inoue 	m_freem(m0);
107882cd038dSYoshinobu Inoue 	for (m0 = m; m; m = m0) {
107982cd038dSYoshinobu Inoue 		m0 = m->m_nextpkt;
108082cd038dSYoshinobu Inoue 		m->m_nextpkt = 0;
108182cd038dSYoshinobu Inoue 		if (error == 0) {
1082fe937674SJosef Karthauser 			/* Record statistics for this interface address. */
1083fe937674SJosef Karthauser 			if (ia) {
1084fe937674SJosef Karthauser 				ia->ia_ifa.if_opackets++;
1085fe937674SJosef Karthauser 				ia->ia_ifa.if_obytes += m->m_pkthdr.len;
1086fe937674SJosef Karthauser 			}
1087686cdd19SJun-ichiro itojun Hagino 			error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
108882cd038dSYoshinobu Inoue 		} else
108982cd038dSYoshinobu Inoue 			m_freem(m);
109082cd038dSYoshinobu Inoue 	}
109182cd038dSYoshinobu Inoue 
109282cd038dSYoshinobu Inoue 	if (error == 0)
1093603724d3SBjoern A. Zeeb 		V_ip6stat.ip6s_fragmented++;
109482cd038dSYoshinobu Inoue 
109582cd038dSYoshinobu Inoue done:
1096*77931dd5SKip Macy 	if (ro == &ip6route && ro->ro_rt && flevalid == 0) {
1097*77931dd5SKip Macy                 /* brace necessary for RTFREE */
109882cd038dSYoshinobu Inoue 		RTFREE(ro->ro_rt);
1099*77931dd5SKip Macy 	} else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt &&
1100*77931dd5SKip Macy 	    ((flevalid == 0) || (ro_pmtu != ro))) {
110182cd038dSYoshinobu Inoue 		RTFREE(ro_pmtu->ro_rt);
110282cd038dSYoshinobu Inoue 	}
11038cfbd299SBjoern A. Zeeb #ifdef IPSEC
11048cfbd299SBjoern A. Zeeb 	if (sp != NULL)
11058cfbd299SBjoern A. Zeeb 		KEY_FREESP(&sp);
11068cfbd299SBjoern A. Zeeb #endif
110782cd038dSYoshinobu Inoue 
110882cd038dSYoshinobu Inoue 	return (error);
110982cd038dSYoshinobu Inoue 
111082cd038dSYoshinobu Inoue freehdrs:
111182cd038dSYoshinobu Inoue 	m_freem(exthdrs.ip6e_hbh);	/* m_freem will check if mbuf is 0 */
111282cd038dSYoshinobu Inoue 	m_freem(exthdrs.ip6e_dest1);
111382cd038dSYoshinobu Inoue 	m_freem(exthdrs.ip6e_rthdr);
111482cd038dSYoshinobu Inoue 	m_freem(exthdrs.ip6e_dest2);
11157efe5d92SHajimu UMEMOTO 	/* FALLTHROUGH */
111682cd038dSYoshinobu Inoue bad:
11172cb64cb2SGeorge V. Neville-Neil 	if (m)
111882cd038dSYoshinobu Inoue 		m_freem(m);
111982cd038dSYoshinobu Inoue 	goto done;
112082cd038dSYoshinobu Inoue }
112182cd038dSYoshinobu Inoue 
112282cd038dSYoshinobu Inoue static int
11231272577eSXin LI ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
112482cd038dSYoshinobu Inoue {
112582cd038dSYoshinobu Inoue 	struct mbuf *m;
112682cd038dSYoshinobu Inoue 
112782cd038dSYoshinobu Inoue 	if (hlen > MCLBYTES)
112882cd038dSYoshinobu Inoue 		return (ENOBUFS); /* XXX */
112982cd038dSYoshinobu Inoue 
1130a163d034SWarner Losh 	MGET(m, M_DONTWAIT, MT_DATA);
113182cd038dSYoshinobu Inoue 	if (!m)
113282cd038dSYoshinobu Inoue 		return (ENOBUFS);
113382cd038dSYoshinobu Inoue 
113482cd038dSYoshinobu Inoue 	if (hlen > MLEN) {
1135a163d034SWarner Losh 		MCLGET(m, M_DONTWAIT);
113682cd038dSYoshinobu Inoue 		if ((m->m_flags & M_EXT) == 0) {
113782cd038dSYoshinobu Inoue 			m_free(m);
113882cd038dSYoshinobu Inoue 			return (ENOBUFS);
113982cd038dSYoshinobu Inoue 		}
114082cd038dSYoshinobu Inoue 	}
114182cd038dSYoshinobu Inoue 	m->m_len = hlen;
114282cd038dSYoshinobu Inoue 	if (hdr)
114382cd038dSYoshinobu Inoue 		bcopy(hdr, mtod(m, caddr_t), hlen);
114482cd038dSYoshinobu Inoue 
114582cd038dSYoshinobu Inoue 	*mp = m;
114682cd038dSYoshinobu Inoue 	return (0);
114782cd038dSYoshinobu Inoue }
114882cd038dSYoshinobu Inoue 
114982cd038dSYoshinobu Inoue /*
115082cd038dSYoshinobu Inoue  * Insert jumbo payload option.
115182cd038dSYoshinobu Inoue  */
115282cd038dSYoshinobu Inoue static int
11531272577eSXin LI ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
115482cd038dSYoshinobu Inoue {
115582cd038dSYoshinobu Inoue 	struct mbuf *mopt;
115682cd038dSYoshinobu Inoue 	u_char *optbuf;
115733841545SHajimu UMEMOTO 	u_int32_t v;
115882cd038dSYoshinobu Inoue 
115982cd038dSYoshinobu Inoue #define JUMBOOPTLEN	8	/* length of jumbo payload option and padding */
116082cd038dSYoshinobu Inoue 
116182cd038dSYoshinobu Inoue 	/*
116282cd038dSYoshinobu Inoue 	 * If there is no hop-by-hop options header, allocate new one.
116382cd038dSYoshinobu Inoue 	 * If there is one but it doesn't have enough space to store the
116482cd038dSYoshinobu Inoue 	 * jumbo payload option, allocate a cluster to store the whole options.
116582cd038dSYoshinobu Inoue 	 * Otherwise, use it to store the options.
116682cd038dSYoshinobu Inoue 	 */
116782cd038dSYoshinobu Inoue 	if (exthdrs->ip6e_hbh == 0) {
1168a163d034SWarner Losh 		MGET(mopt, M_DONTWAIT, MT_DATA);
116982cd038dSYoshinobu Inoue 		if (mopt == 0)
117082cd038dSYoshinobu Inoue 			return (ENOBUFS);
117182cd038dSYoshinobu Inoue 		mopt->m_len = JUMBOOPTLEN;
117282cd038dSYoshinobu Inoue 		optbuf = mtod(mopt, u_char *);
117382cd038dSYoshinobu Inoue 		optbuf[1] = 0;	/* = ((JUMBOOPTLEN) >> 3) - 1 */
117482cd038dSYoshinobu Inoue 		exthdrs->ip6e_hbh = mopt;
117582cd038dSYoshinobu Inoue 	} else {
117682cd038dSYoshinobu Inoue 		struct ip6_hbh *hbh;
117782cd038dSYoshinobu Inoue 
117882cd038dSYoshinobu Inoue 		mopt = exthdrs->ip6e_hbh;
117982cd038dSYoshinobu Inoue 		if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
118033841545SHajimu UMEMOTO 			/*
118133841545SHajimu UMEMOTO 			 * XXX assumption:
118233841545SHajimu UMEMOTO 			 * - exthdrs->ip6e_hbh is not referenced from places
118333841545SHajimu UMEMOTO 			 *   other than exthdrs.
118433841545SHajimu UMEMOTO 			 * - exthdrs->ip6e_hbh is not an mbuf chain.
118533841545SHajimu UMEMOTO 			 */
118682cd038dSYoshinobu Inoue 			int oldoptlen = mopt->m_len;
118733841545SHajimu UMEMOTO 			struct mbuf *n;
118882cd038dSYoshinobu Inoue 
118933841545SHajimu UMEMOTO 			/*
119033841545SHajimu UMEMOTO 			 * XXX: give up if the whole (new) hbh header does
119133841545SHajimu UMEMOTO 			 * not fit even in an mbuf cluster.
119233841545SHajimu UMEMOTO 			 */
119333841545SHajimu UMEMOTO 			if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
119482cd038dSYoshinobu Inoue 				return (ENOBUFS);
119582cd038dSYoshinobu Inoue 
119633841545SHajimu UMEMOTO 			/*
119733841545SHajimu UMEMOTO 			 * As a consequence, we must always prepare a cluster
119833841545SHajimu UMEMOTO 			 * at this point.
119933841545SHajimu UMEMOTO 			 */
1200a163d034SWarner Losh 			MGET(n, M_DONTWAIT, MT_DATA);
120133841545SHajimu UMEMOTO 			if (n) {
1202a163d034SWarner Losh 				MCLGET(n, M_DONTWAIT);
120333841545SHajimu UMEMOTO 				if ((n->m_flags & M_EXT) == 0) {
120433841545SHajimu UMEMOTO 					m_freem(n);
120533841545SHajimu UMEMOTO 					n = NULL;
120633841545SHajimu UMEMOTO 				}
120733841545SHajimu UMEMOTO 			}
120833841545SHajimu UMEMOTO 			if (!n)
120933841545SHajimu UMEMOTO 				return (ENOBUFS);
121033841545SHajimu UMEMOTO 			n->m_len = oldoptlen + JUMBOOPTLEN;
121133841545SHajimu UMEMOTO 			bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
121233841545SHajimu UMEMOTO 			    oldoptlen);
121333841545SHajimu UMEMOTO 			optbuf = mtod(n, caddr_t) + oldoptlen;
121433841545SHajimu UMEMOTO 			m_freem(mopt);
121533841545SHajimu UMEMOTO 			mopt = exthdrs->ip6e_hbh = n;
121682cd038dSYoshinobu Inoue 		} else {
121782cd038dSYoshinobu Inoue 			optbuf = mtod(mopt, u_char *) + mopt->m_len;
121882cd038dSYoshinobu Inoue 			mopt->m_len += JUMBOOPTLEN;
121982cd038dSYoshinobu Inoue 		}
122082cd038dSYoshinobu Inoue 		optbuf[0] = IP6OPT_PADN;
122182cd038dSYoshinobu Inoue 		optbuf[1] = 1;
122282cd038dSYoshinobu Inoue 
122382cd038dSYoshinobu Inoue 		/*
122482cd038dSYoshinobu Inoue 		 * Adjust the header length according to the pad and
122582cd038dSYoshinobu Inoue 		 * the jumbo payload option.
122682cd038dSYoshinobu Inoue 		 */
122782cd038dSYoshinobu Inoue 		hbh = mtod(mopt, struct ip6_hbh *);
122882cd038dSYoshinobu Inoue 		hbh->ip6h_len += (JUMBOOPTLEN >> 3);
122982cd038dSYoshinobu Inoue 	}
123082cd038dSYoshinobu Inoue 
123182cd038dSYoshinobu Inoue 	/* fill in the option. */
123282cd038dSYoshinobu Inoue 	optbuf[2] = IP6OPT_JUMBO;
123382cd038dSYoshinobu Inoue 	optbuf[3] = 4;
123433841545SHajimu UMEMOTO 	v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
123533841545SHajimu UMEMOTO 	bcopy(&v, &optbuf[4], sizeof(u_int32_t));
123682cd038dSYoshinobu Inoue 
123782cd038dSYoshinobu Inoue 	/* finally, adjust the packet header length */
123882cd038dSYoshinobu Inoue 	exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
123982cd038dSYoshinobu Inoue 
124082cd038dSYoshinobu Inoue 	return (0);
124182cd038dSYoshinobu Inoue #undef JUMBOOPTLEN
124282cd038dSYoshinobu Inoue }
124382cd038dSYoshinobu Inoue 
124482cd038dSYoshinobu Inoue /*
124582cd038dSYoshinobu Inoue  * Insert fragment header and copy unfragmentable header portions.
124682cd038dSYoshinobu Inoue  */
124782cd038dSYoshinobu Inoue static int
12481272577eSXin LI ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
12491272577eSXin LI     struct ip6_frag **frghdrp)
125082cd038dSYoshinobu Inoue {
125182cd038dSYoshinobu Inoue 	struct mbuf *n, *mlast;
125282cd038dSYoshinobu Inoue 
125382cd038dSYoshinobu Inoue 	if (hlen > sizeof(struct ip6_hdr)) {
125482cd038dSYoshinobu Inoue 		n = m_copym(m0, sizeof(struct ip6_hdr),
1255a163d034SWarner Losh 		    hlen - sizeof(struct ip6_hdr), M_DONTWAIT);
125682cd038dSYoshinobu Inoue 		if (n == 0)
125782cd038dSYoshinobu Inoue 			return (ENOBUFS);
125882cd038dSYoshinobu Inoue 		m->m_next = n;
125982cd038dSYoshinobu Inoue 	} else
126082cd038dSYoshinobu Inoue 		n = m;
126182cd038dSYoshinobu Inoue 
126282cd038dSYoshinobu Inoue 	/* Search for the last mbuf of unfragmentable part. */
126382cd038dSYoshinobu Inoue 	for (mlast = n; mlast->m_next; mlast = mlast->m_next)
126482cd038dSYoshinobu Inoue 		;
126582cd038dSYoshinobu Inoue 
126682cd038dSYoshinobu Inoue 	if ((mlast->m_flags & M_EXT) == 0 &&
1267686cdd19SJun-ichiro itojun Hagino 	    M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
126882cd038dSYoshinobu Inoue 		/* use the trailing space of the last mbuf for the fragment hdr */
12697efe5d92SHajimu UMEMOTO 		*frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
12707efe5d92SHajimu UMEMOTO 		    mlast->m_len);
127182cd038dSYoshinobu Inoue 		mlast->m_len += sizeof(struct ip6_frag);
127282cd038dSYoshinobu Inoue 		m->m_pkthdr.len += sizeof(struct ip6_frag);
127382cd038dSYoshinobu Inoue 	} else {
127482cd038dSYoshinobu Inoue 		/* allocate a new mbuf for the fragment header */
127582cd038dSYoshinobu Inoue 		struct mbuf *mfrg;
127682cd038dSYoshinobu Inoue 
1277a163d034SWarner Losh 		MGET(mfrg, M_DONTWAIT, MT_DATA);
127882cd038dSYoshinobu Inoue 		if (mfrg == 0)
127982cd038dSYoshinobu Inoue 			return (ENOBUFS);
128082cd038dSYoshinobu Inoue 		mfrg->m_len = sizeof(struct ip6_frag);
128182cd038dSYoshinobu Inoue 		*frghdrp = mtod(mfrg, struct ip6_frag *);
128282cd038dSYoshinobu Inoue 		mlast->m_next = mfrg;
128382cd038dSYoshinobu Inoue 	}
128482cd038dSYoshinobu Inoue 
128582cd038dSYoshinobu Inoue 	return (0);
128682cd038dSYoshinobu Inoue }
128782cd038dSYoshinobu Inoue 
128831b3783cSHajimu UMEMOTO static int
12891272577eSXin LI ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro,
12901272577eSXin LI     struct ifnet *ifp, struct in6_addr *dst, u_long *mtup,
12911272577eSXin LI     int *alwaysfragp)
129231b3783cSHajimu UMEMOTO {
129331b3783cSHajimu UMEMOTO 	u_int32_t mtu = 0;
1294f95d4633SHajimu UMEMOTO 	int alwaysfrag = 0;
129531b3783cSHajimu UMEMOTO 	int error = 0;
129631b3783cSHajimu UMEMOTO 
129731b3783cSHajimu UMEMOTO 	if (ro_pmtu != ro) {
129831b3783cSHajimu UMEMOTO 		/* The first hop and the final destination may differ. */
129931b3783cSHajimu UMEMOTO 		struct sockaddr_in6 *sa6_dst =
130031b3783cSHajimu UMEMOTO 		    (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
130131b3783cSHajimu UMEMOTO 		if (ro_pmtu->ro_rt &&
1302e5f467a2SHajimu UMEMOTO 		    ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 ||
130331b3783cSHajimu UMEMOTO 		     !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) {
130431b3783cSHajimu UMEMOTO 			RTFREE(ro_pmtu->ro_rt);
130531b3783cSHajimu UMEMOTO 			ro_pmtu->ro_rt = (struct rtentry *)NULL;
130631b3783cSHajimu UMEMOTO 		}
130731b3783cSHajimu UMEMOTO 		if (ro_pmtu->ro_rt == NULL) {
130831b3783cSHajimu UMEMOTO 			bzero(sa6_dst, sizeof(*sa6_dst));
130931b3783cSHajimu UMEMOTO 			sa6_dst->sin6_family = AF_INET6;
131031b3783cSHajimu UMEMOTO 			sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
131131b3783cSHajimu UMEMOTO 			sa6_dst->sin6_addr = *dst;
131231b3783cSHajimu UMEMOTO 
131331b3783cSHajimu UMEMOTO 			rtalloc((struct route *)ro_pmtu);
131431b3783cSHajimu UMEMOTO 		}
131531b3783cSHajimu UMEMOTO 	}
131631b3783cSHajimu UMEMOTO 	if (ro_pmtu->ro_rt) {
131731b3783cSHajimu UMEMOTO 		u_int32_t ifmtu;
131897d8d152SAndre Oppermann 		struct in_conninfo inc;
131997d8d152SAndre Oppermann 
132097d8d152SAndre Oppermann 		bzero(&inc, sizeof(inc));
1321dcdb4371SBjoern A. Zeeb 		inc.inc_flags |= INC_ISIPV6;
132297d8d152SAndre Oppermann 		inc.inc6_faddr = *dst;
132331b3783cSHajimu UMEMOTO 
132431b3783cSHajimu UMEMOTO 		if (ifp == NULL)
132531b3783cSHajimu UMEMOTO 			ifp = ro_pmtu->ro_rt->rt_ifp;
132631b3783cSHajimu UMEMOTO 		ifmtu = IN6_LINKMTU(ifp);
132797d8d152SAndre Oppermann 		mtu = tcp_hc_getmtu(&inc);
132897d8d152SAndre Oppermann 		if (mtu)
132997d8d152SAndre Oppermann 			mtu = min(mtu, ro_pmtu->ro_rt->rt_rmx.rmx_mtu);
133097d8d152SAndre Oppermann 		else
133131b3783cSHajimu UMEMOTO 			mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu;
133231b3783cSHajimu UMEMOTO 		if (mtu == 0)
133331b3783cSHajimu UMEMOTO 			mtu = ifmtu;
1334f95d4633SHajimu UMEMOTO 		else if (mtu < IPV6_MMTU) {
1335f95d4633SHajimu UMEMOTO 			/*
1336f95d4633SHajimu UMEMOTO 			 * RFC2460 section 5, last paragraph:
1337f95d4633SHajimu UMEMOTO 			 * if we record ICMPv6 too big message with
1338f95d4633SHajimu UMEMOTO 			 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1339f95d4633SHajimu UMEMOTO 			 * or smaller, with framgent header attached.
1340f95d4633SHajimu UMEMOTO 			 * (fragment header is needed regardless from the
1341f95d4633SHajimu UMEMOTO 			 * packet size, for translators to identify packets)
1342f95d4633SHajimu UMEMOTO 			 */
1343f95d4633SHajimu UMEMOTO 			alwaysfrag = 1;
1344f95d4633SHajimu UMEMOTO 			mtu = IPV6_MMTU;
1345f95d4633SHajimu UMEMOTO 		} else if (mtu > ifmtu) {
134631b3783cSHajimu UMEMOTO 			/*
134731b3783cSHajimu UMEMOTO 			 * The MTU on the route is larger than the MTU on
134831b3783cSHajimu UMEMOTO 			 * the interface!  This shouldn't happen, unless the
134931b3783cSHajimu UMEMOTO 			 * MTU of the interface has been changed after the
135031b3783cSHajimu UMEMOTO 			 * interface was brought up.  Change the MTU in the
135131b3783cSHajimu UMEMOTO 			 * route to match the interface MTU (as long as the
135231b3783cSHajimu UMEMOTO 			 * field isn't locked).
135331b3783cSHajimu UMEMOTO 			 */
135431b3783cSHajimu UMEMOTO 			mtu = ifmtu;
135531b3783cSHajimu UMEMOTO 			ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu;
135631b3783cSHajimu UMEMOTO 		}
135731b3783cSHajimu UMEMOTO 	} else if (ifp) {
135831b3783cSHajimu UMEMOTO 		mtu = IN6_LINKMTU(ifp);
135931b3783cSHajimu UMEMOTO 	} else
136031b3783cSHajimu UMEMOTO 		error = EHOSTUNREACH; /* XXX */
136131b3783cSHajimu UMEMOTO 
136231b3783cSHajimu UMEMOTO 	*mtup = mtu;
1363f95d4633SHajimu UMEMOTO 	if (alwaysfragp)
1364f95d4633SHajimu UMEMOTO 		*alwaysfragp = alwaysfrag;
136531b3783cSHajimu UMEMOTO 	return (error);
136631b3783cSHajimu UMEMOTO }
136731b3783cSHajimu UMEMOTO 
136882cd038dSYoshinobu Inoue /*
136982cd038dSYoshinobu Inoue  * IP6 socket option processing.
137082cd038dSYoshinobu Inoue  */
137182cd038dSYoshinobu Inoue int
13721272577eSXin LI ip6_ctloutput(struct socket *so, struct sockopt *sopt)
137382cd038dSYoshinobu Inoue {
137479ba3952SBjoern A. Zeeb 	int optdatalen, uproto;
1375f95d4633SHajimu UMEMOTO 	void *optdata;
137633841545SHajimu UMEMOTO 	struct inpcb *in6p = sotoinpcb(so);
137782cd038dSYoshinobu Inoue 	int error, optval;
137882cd038dSYoshinobu Inoue 	int level, op, optname;
137982cd038dSYoshinobu Inoue 	int optlen;
1380b40ce416SJulian Elischer 	struct thread *td;
138182cd038dSYoshinobu Inoue 
138282cd038dSYoshinobu Inoue 	level = sopt->sopt_level;
138382cd038dSYoshinobu Inoue 	op = sopt->sopt_dir;
138482cd038dSYoshinobu Inoue 	optname = sopt->sopt_name;
138582cd038dSYoshinobu Inoue 	optlen = sopt->sopt_valsize;
1386b40ce416SJulian Elischer 	td = sopt->sopt_td;
1387cc29ac7dSRobert Watson 	error = 0;
1388cc29ac7dSRobert Watson 	optval = 0;
1389f95d4633SHajimu UMEMOTO 	uproto = (int)so->so_proto->pr_protocol;
139082cd038dSYoshinobu Inoue 
139182cd038dSYoshinobu Inoue 	if (level == IPPROTO_IPV6) {
139282cd038dSYoshinobu Inoue 		switch (op) {
139333841545SHajimu UMEMOTO 
139482cd038dSYoshinobu Inoue 		case SOPT_SET:
139582cd038dSYoshinobu Inoue 			switch (optname) {
1396f95d4633SHajimu UMEMOTO 			case IPV6_2292PKTOPTIONS:
1397f95d4633SHajimu UMEMOTO #ifdef IPV6_PKTOPTIONS
139882cd038dSYoshinobu Inoue 			case IPV6_PKTOPTIONS:
1399f95d4633SHajimu UMEMOTO #endif
140082cd038dSYoshinobu Inoue 			{
140182cd038dSYoshinobu Inoue 				struct mbuf *m;
140282cd038dSYoshinobu Inoue 
140382cd038dSYoshinobu Inoue 				error = soopt_getm(sopt, &m); /* XXX */
1404a89ec05eSPeter Wemm 				if (error != 0)
140582cd038dSYoshinobu Inoue 					break;
140682cd038dSYoshinobu Inoue 				error = soopt_mcopyin(sopt, m); /* XXX */
1407a89ec05eSPeter Wemm 				if (error != 0)
140882cd038dSYoshinobu Inoue 					break;
140933841545SHajimu UMEMOTO 				error = ip6_pcbopts(&in6p->in6p_outputopts,
141033841545SHajimu UMEMOTO 						    m, so, sopt);
141133841545SHajimu UMEMOTO 				m_freem(m); /* XXX */
141282cd038dSYoshinobu Inoue 				break;
141382cd038dSYoshinobu Inoue 			}
141433841545SHajimu UMEMOTO 
141533841545SHajimu UMEMOTO 			/*
141633841545SHajimu UMEMOTO 			 * Use of some Hop-by-Hop options or some
141733841545SHajimu UMEMOTO 			 * Destination options, might require special
141833841545SHajimu UMEMOTO 			 * privilege.  That is, normal applications
141933841545SHajimu UMEMOTO 			 * (without special privilege) might be forbidden
142033841545SHajimu UMEMOTO 			 * from setting certain options in outgoing packets,
142133841545SHajimu UMEMOTO 			 * and might never see certain options in received
142233841545SHajimu UMEMOTO 			 * packets. [RFC 2292 Section 6]
142333841545SHajimu UMEMOTO 			 * KAME specific note:
142433841545SHajimu UMEMOTO 			 *  KAME prevents non-privileged users from sending or
142533841545SHajimu UMEMOTO 			 *  receiving ANY hbh/dst options in order to avoid
142633841545SHajimu UMEMOTO 			 *  overhead of parsing options in the kernel.
142733841545SHajimu UMEMOTO 			 */
1428f95d4633SHajimu UMEMOTO 			case IPV6_RECVHOPOPTS:
1429f95d4633SHajimu UMEMOTO 			case IPV6_RECVDSTOPTS:
1430f95d4633SHajimu UMEMOTO 			case IPV6_RECVRTHDRDSTOPTS:
143179ba3952SBjoern A. Zeeb 				if (td != NULL) {
143279ba3952SBjoern A. Zeeb 					error = priv_check(td,
143379ba3952SBjoern A. Zeeb 					    PRIV_NETINET_SETHDROPTS);
143479ba3952SBjoern A. Zeeb 					if (error)
1435f95d4633SHajimu UMEMOTO 						break;
1436f95d4633SHajimu UMEMOTO 				}
1437f95d4633SHajimu UMEMOTO 				/* FALLTHROUGH */
143882cd038dSYoshinobu Inoue 			case IPV6_UNICAST_HOPS:
1439f95d4633SHajimu UMEMOTO 			case IPV6_HOPLIMIT:
144082cd038dSYoshinobu Inoue 			case IPV6_FAITH:
144133841545SHajimu UMEMOTO 
1442f95d4633SHajimu UMEMOTO 			case IPV6_RECVPKTINFO:
1443f95d4633SHajimu UMEMOTO 			case IPV6_RECVHOPLIMIT:
1444f95d4633SHajimu UMEMOTO 			case IPV6_RECVRTHDR:
1445f95d4633SHajimu UMEMOTO 			case IPV6_RECVPATHMTU:
1446f95d4633SHajimu UMEMOTO 			case IPV6_RECVTCLASS:
144733841545SHajimu UMEMOTO 			case IPV6_V6ONLY:
1448f95d4633SHajimu UMEMOTO 			case IPV6_AUTOFLOWLABEL:
1449f44270e7SPawel Jakub Dawidek 			case IPV6_BINDANY:
1450f44270e7SPawel Jakub Dawidek 				if (optname == IPV6_BINDANY && td != NULL) {
1451f44270e7SPawel Jakub Dawidek 					error = priv_check(td,
1452f44270e7SPawel Jakub Dawidek 					    PRIV_NETINET_BINDANY);
1453f44270e7SPawel Jakub Dawidek 					if (error)
1454f44270e7SPawel Jakub Dawidek 						break;
1455f44270e7SPawel Jakub Dawidek 				}
1456f44270e7SPawel Jakub Dawidek 
145733841545SHajimu UMEMOTO 				if (optlen != sizeof(int)) {
145882cd038dSYoshinobu Inoue 					error = EINVAL;
145933841545SHajimu UMEMOTO 					break;
146033841545SHajimu UMEMOTO 				}
146182cd038dSYoshinobu Inoue 				error = sooptcopyin(sopt, &optval,
146282cd038dSYoshinobu Inoue 					sizeof optval, sizeof optval);
146382cd038dSYoshinobu Inoue 				if (error)
146482cd038dSYoshinobu Inoue 					break;
146582cd038dSYoshinobu Inoue 				switch (optname) {
146682cd038dSYoshinobu Inoue 
146782cd038dSYoshinobu Inoue 				case IPV6_UNICAST_HOPS:
146882cd038dSYoshinobu Inoue 					if (optval < -1 || optval >= 256)
146982cd038dSYoshinobu Inoue 						error = EINVAL;
147082cd038dSYoshinobu Inoue 					else {
147182cd038dSYoshinobu Inoue 						/* -1 = kernel default */
147282cd038dSYoshinobu Inoue 						in6p->in6p_hops = optval;
1473fc384fa5SBjoern A. Zeeb 						if ((in6p->inp_vflag &
147482cd038dSYoshinobu Inoue 						     INP_IPV4) != 0)
147582cd038dSYoshinobu Inoue 							in6p->inp_ip_ttl = optval;
147682cd038dSYoshinobu Inoue 					}
147782cd038dSYoshinobu Inoue 					break;
147882cd038dSYoshinobu Inoue #define OPTSET(bit) \
147933841545SHajimu UMEMOTO do { \
148082cd038dSYoshinobu Inoue 	if (optval) \
1481fc384fa5SBjoern A. Zeeb 		in6p->inp_flags |= (bit); \
148282cd038dSYoshinobu Inoue 	else \
1483fc384fa5SBjoern A. Zeeb 		in6p->inp_flags &= ~(bit); \
14847efe5d92SHajimu UMEMOTO } while (/*CONSTCOND*/ 0)
1485f95d4633SHajimu UMEMOTO #define OPTSET2292(bit) \
1486f95d4633SHajimu UMEMOTO do { \
1487fc384fa5SBjoern A. Zeeb 	in6p->inp_flags |= IN6P_RFC2292; \
1488f95d4633SHajimu UMEMOTO 	if (optval) \
1489fc384fa5SBjoern A. Zeeb 		in6p->inp_flags |= (bit); \
1490f95d4633SHajimu UMEMOTO 	else \
1491fc384fa5SBjoern A. Zeeb 		in6p->inp_flags &= ~(bit); \
1492f95d4633SHajimu UMEMOTO } while (/*CONSTCOND*/ 0)
1493fc384fa5SBjoern A. Zeeb #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0)
149482cd038dSYoshinobu Inoue 
1495f95d4633SHajimu UMEMOTO 				case IPV6_RECVPKTINFO:
1496f95d4633SHajimu UMEMOTO 					/* cannot mix with RFC2292 */
1497f95d4633SHajimu UMEMOTO 					if (OPTBIT(IN6P_RFC2292)) {
1498f95d4633SHajimu UMEMOTO 						error = EINVAL;
1499f95d4633SHajimu UMEMOTO 						break;
1500f95d4633SHajimu UMEMOTO 					}
1501f95d4633SHajimu UMEMOTO 					OPTSET(IN6P_PKTINFO);
1502f95d4633SHajimu UMEMOTO 					break;
1503f95d4633SHajimu UMEMOTO 
1504f95d4633SHajimu UMEMOTO 				case IPV6_HOPLIMIT:
1505f95d4633SHajimu UMEMOTO 				{
1506f95d4633SHajimu UMEMOTO 					struct ip6_pktopts **optp;
1507f95d4633SHajimu UMEMOTO 
1508f95d4633SHajimu UMEMOTO 					/* cannot mix with RFC2292 */
1509f95d4633SHajimu UMEMOTO 					if (OPTBIT(IN6P_RFC2292)) {
1510f95d4633SHajimu UMEMOTO 						error = EINVAL;
1511f95d4633SHajimu UMEMOTO 						break;
1512f95d4633SHajimu UMEMOTO 					}
1513f95d4633SHajimu UMEMOTO 					optp = &in6p->in6p_outputopts;
1514f95d4633SHajimu UMEMOTO 					error = ip6_pcbopt(IPV6_HOPLIMIT,
151579ba3952SBjoern A. Zeeb 					    (u_char *)&optval, sizeof(optval),
151679ba3952SBjoern A. Zeeb 					    optp, (td != NULL) ? td->td_ucred :
151779ba3952SBjoern A. Zeeb 					    NULL, uproto);
1518f95d4633SHajimu UMEMOTO 					break;
1519f95d4633SHajimu UMEMOTO 				}
1520f95d4633SHajimu UMEMOTO 
1521f95d4633SHajimu UMEMOTO 				case IPV6_RECVHOPLIMIT:
1522f95d4633SHajimu UMEMOTO 					/* cannot mix with RFC2292 */
1523f95d4633SHajimu UMEMOTO 					if (OPTBIT(IN6P_RFC2292)) {
1524f95d4633SHajimu UMEMOTO 						error = EINVAL;
1525f95d4633SHajimu UMEMOTO 						break;
1526f95d4633SHajimu UMEMOTO 					}
1527f95d4633SHajimu UMEMOTO 					OPTSET(IN6P_HOPLIMIT);
1528f95d4633SHajimu UMEMOTO 					break;
1529f95d4633SHajimu UMEMOTO 
1530f95d4633SHajimu UMEMOTO 				case IPV6_RECVHOPOPTS:
1531f95d4633SHajimu UMEMOTO 					/* cannot mix with RFC2292 */
1532f95d4633SHajimu UMEMOTO 					if (OPTBIT(IN6P_RFC2292)) {
1533f95d4633SHajimu UMEMOTO 						error = EINVAL;
1534f95d4633SHajimu UMEMOTO 						break;
1535f95d4633SHajimu UMEMOTO 					}
1536f95d4633SHajimu UMEMOTO 					OPTSET(IN6P_HOPOPTS);
1537f95d4633SHajimu UMEMOTO 					break;
1538f95d4633SHajimu UMEMOTO 
1539f95d4633SHajimu UMEMOTO 				case IPV6_RECVDSTOPTS:
1540f95d4633SHajimu UMEMOTO 					/* cannot mix with RFC2292 */
1541f95d4633SHajimu UMEMOTO 					if (OPTBIT(IN6P_RFC2292)) {
1542f95d4633SHajimu UMEMOTO 						error = EINVAL;
1543f95d4633SHajimu UMEMOTO 						break;
1544f95d4633SHajimu UMEMOTO 					}
1545f95d4633SHajimu UMEMOTO 					OPTSET(IN6P_DSTOPTS);
1546f95d4633SHajimu UMEMOTO 					break;
1547f95d4633SHajimu UMEMOTO 
1548f95d4633SHajimu UMEMOTO 				case IPV6_RECVRTHDRDSTOPTS:
1549f95d4633SHajimu UMEMOTO 					/* cannot mix with RFC2292 */
1550f95d4633SHajimu UMEMOTO 					if (OPTBIT(IN6P_RFC2292)) {
1551f95d4633SHajimu UMEMOTO 						error = EINVAL;
1552f95d4633SHajimu UMEMOTO 						break;
1553f95d4633SHajimu UMEMOTO 					}
1554f95d4633SHajimu UMEMOTO 					OPTSET(IN6P_RTHDRDSTOPTS);
1555f95d4633SHajimu UMEMOTO 					break;
1556f95d4633SHajimu UMEMOTO 
1557f95d4633SHajimu UMEMOTO 				case IPV6_RECVRTHDR:
1558f95d4633SHajimu UMEMOTO 					/* cannot mix with RFC2292 */
1559f95d4633SHajimu UMEMOTO 					if (OPTBIT(IN6P_RFC2292)) {
1560f95d4633SHajimu UMEMOTO 						error = EINVAL;
1561f95d4633SHajimu UMEMOTO 						break;
1562f95d4633SHajimu UMEMOTO 					}
1563f95d4633SHajimu UMEMOTO 					OPTSET(IN6P_RTHDR);
156482cd038dSYoshinobu Inoue 					break;
156582cd038dSYoshinobu Inoue 
156682cd038dSYoshinobu Inoue 				case IPV6_FAITH:
156797590249SBjoern A. Zeeb 					OPTSET(INP_FAITH);
156882cd038dSYoshinobu Inoue 					break;
156982cd038dSYoshinobu Inoue 
1570f95d4633SHajimu UMEMOTO 				case IPV6_RECVPATHMTU:
1571f95d4633SHajimu UMEMOTO 					/*
1572f95d4633SHajimu UMEMOTO 					 * We ignore this option for TCP
1573f95d4633SHajimu UMEMOTO 					 * sockets.
157418b35df8SHajimu UMEMOTO 					 * (RFC3542 leaves this case
1575f95d4633SHajimu UMEMOTO 					 * unspecified.)
1576f95d4633SHajimu UMEMOTO 					 */
1577f95d4633SHajimu UMEMOTO 					if (uproto != IPPROTO_TCP)
1578f95d4633SHajimu UMEMOTO 						OPTSET(IN6P_MTU);
1579f95d4633SHajimu UMEMOTO 					break;
1580f95d4633SHajimu UMEMOTO 
158133841545SHajimu UMEMOTO 				case IPV6_V6ONLY:
158233841545SHajimu UMEMOTO 					/*
15830554093bSHajimu UMEMOTO 					 * make setsockopt(IPV6_V6ONLY)
15840554093bSHajimu UMEMOTO 					 * available only prior to bind(2).
15850554093bSHajimu UMEMOTO 					 * see ipng mailing list, Jun 22 2001.
15860554093bSHajimu UMEMOTO 					 */
1587fc384fa5SBjoern A. Zeeb 					if (in6p->inp_lport ||
15887efe5d92SHajimu UMEMOTO 					    !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
15890554093bSHajimu UMEMOTO 						error = EINVAL;
15900554093bSHajimu UMEMOTO 						break;
15910554093bSHajimu UMEMOTO 					}
159233841545SHajimu UMEMOTO 					OPTSET(IN6P_IPV6_V6ONLY);
159312253795SHajimu UMEMOTO 					if (optval)
1594fc384fa5SBjoern A. Zeeb 						in6p->inp_vflag &= ~INP_IPV4;
159512253795SHajimu UMEMOTO 					else
1596fc384fa5SBjoern A. Zeeb 						in6p->inp_vflag |= INP_IPV4;
159782cd038dSYoshinobu Inoue 					break;
1598f95d4633SHajimu UMEMOTO 				case IPV6_RECVTCLASS:
1599f95d4633SHajimu UMEMOTO 					/* cannot mix with RFC2292 XXX */
1600f95d4633SHajimu UMEMOTO 					if (OPTBIT(IN6P_RFC2292)) {
1601f95d4633SHajimu UMEMOTO 						error = EINVAL;
1602f95d4633SHajimu UMEMOTO 						break;
1603f95d4633SHajimu UMEMOTO 					}
1604f95d4633SHajimu UMEMOTO 					OPTSET(IN6P_TCLASS);
1605f95d4633SHajimu UMEMOTO 					break;
1606f95d4633SHajimu UMEMOTO 				case IPV6_AUTOFLOWLABEL:
1607f95d4633SHajimu UMEMOTO 					OPTSET(IN6P_AUTOFLOWLABEL);
1608f95d4633SHajimu UMEMOTO 					break;
1609f95d4633SHajimu UMEMOTO 
1610f44270e7SPawel Jakub Dawidek 				case IPV6_BINDANY:
1611f44270e7SPawel Jakub Dawidek 					OPTSET(INP_BINDANY);
1612f44270e7SPawel Jakub Dawidek 					break;
161382cd038dSYoshinobu Inoue 				}
161433841545SHajimu UMEMOTO 				break;
161533841545SHajimu UMEMOTO 
1616f95d4633SHajimu UMEMOTO 			case IPV6_TCLASS:
1617f95d4633SHajimu UMEMOTO 			case IPV6_DONTFRAG:
1618f95d4633SHajimu UMEMOTO 			case IPV6_USE_MIN_MTU:
1619f95d4633SHajimu UMEMOTO 			case IPV6_PREFER_TEMPADDR:
1620f95d4633SHajimu UMEMOTO 				if (optlen != sizeof(optval)) {
1621f95d4633SHajimu UMEMOTO 					error = EINVAL;
1622f95d4633SHajimu UMEMOTO 					break;
1623f95d4633SHajimu UMEMOTO 				}
1624f95d4633SHajimu UMEMOTO 				error = sooptcopyin(sopt, &optval,
1625f95d4633SHajimu UMEMOTO 					sizeof optval, sizeof optval);
1626f95d4633SHajimu UMEMOTO 				if (error)
1627f95d4633SHajimu UMEMOTO 					break;
1628f95d4633SHajimu UMEMOTO 				{
1629f95d4633SHajimu UMEMOTO 					struct ip6_pktopts **optp;
1630f95d4633SHajimu UMEMOTO 					optp = &in6p->in6p_outputopts;
1631f95d4633SHajimu UMEMOTO 					error = ip6_pcbopt(optname,
163279ba3952SBjoern A. Zeeb 					    (u_char *)&optval, sizeof(optval),
163379ba3952SBjoern A. Zeeb 					    optp, (td != NULL) ? td->td_ucred :
163479ba3952SBjoern A. Zeeb 					    NULL, uproto);
1635f95d4633SHajimu UMEMOTO 					break;
1636f95d4633SHajimu UMEMOTO 				}
1637f95d4633SHajimu UMEMOTO 
1638f95d4633SHajimu UMEMOTO 			case IPV6_2292PKTINFO:
1639f95d4633SHajimu UMEMOTO 			case IPV6_2292HOPLIMIT:
1640f95d4633SHajimu UMEMOTO 			case IPV6_2292HOPOPTS:
1641f95d4633SHajimu UMEMOTO 			case IPV6_2292DSTOPTS:
1642f95d4633SHajimu UMEMOTO 			case IPV6_2292RTHDR:
164333841545SHajimu UMEMOTO 				/* RFC 2292 */
164433841545SHajimu UMEMOTO 				if (optlen != sizeof(int)) {
164533841545SHajimu UMEMOTO 					error = EINVAL;
164633841545SHajimu UMEMOTO 					break;
164733841545SHajimu UMEMOTO 				}
164833841545SHajimu UMEMOTO 				error = sooptcopyin(sopt, &optval,
164933841545SHajimu UMEMOTO 					sizeof optval, sizeof optval);
165033841545SHajimu UMEMOTO 				if (error)
165133841545SHajimu UMEMOTO 					break;
165233841545SHajimu UMEMOTO 				switch (optname) {
1653f95d4633SHajimu UMEMOTO 				case IPV6_2292PKTINFO:
1654f95d4633SHajimu UMEMOTO 					OPTSET2292(IN6P_PKTINFO);
165533841545SHajimu UMEMOTO 					break;
1656f95d4633SHajimu UMEMOTO 				case IPV6_2292HOPLIMIT:
1657f95d4633SHajimu UMEMOTO 					OPTSET2292(IN6P_HOPLIMIT);
165833841545SHajimu UMEMOTO 					break;
1659f95d4633SHajimu UMEMOTO 				case IPV6_2292HOPOPTS:
166033841545SHajimu UMEMOTO 					/*
166133841545SHajimu UMEMOTO 					 * Check super-user privilege.
166233841545SHajimu UMEMOTO 					 * See comments for IPV6_RECVHOPOPTS.
166333841545SHajimu UMEMOTO 					 */
166479ba3952SBjoern A. Zeeb 					if (td != NULL) {
166579ba3952SBjoern A. Zeeb 						error = priv_check(td,
166679ba3952SBjoern A. Zeeb 						    PRIV_NETINET_SETHDROPTS);
166779ba3952SBjoern A. Zeeb 						if (error)
166879ba3952SBjoern A. Zeeb 							return (error);
166979ba3952SBjoern A. Zeeb 					}
1670f95d4633SHajimu UMEMOTO 					OPTSET2292(IN6P_HOPOPTS);
167133841545SHajimu UMEMOTO 					break;
1672f95d4633SHajimu UMEMOTO 				case IPV6_2292DSTOPTS:
167379ba3952SBjoern A. Zeeb 					if (td != NULL) {
167479ba3952SBjoern A. Zeeb 						error = priv_check(td,
167579ba3952SBjoern A. Zeeb 						    PRIV_NETINET_SETHDROPTS);
167679ba3952SBjoern A. Zeeb 						if (error)
167779ba3952SBjoern A. Zeeb 							return (error);
167879ba3952SBjoern A. Zeeb 					}
1679f95d4633SHajimu UMEMOTO 					OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
168033841545SHajimu UMEMOTO 					break;
1681f95d4633SHajimu UMEMOTO 				case IPV6_2292RTHDR:
1682f95d4633SHajimu UMEMOTO 					OPTSET2292(IN6P_RTHDR);
168333841545SHajimu UMEMOTO 					break;
168482cd038dSYoshinobu Inoue 				}
168582cd038dSYoshinobu Inoue 				break;
1686f95d4633SHajimu UMEMOTO 			case IPV6_PKTINFO:
1687f95d4633SHajimu UMEMOTO 			case IPV6_HOPOPTS:
1688f95d4633SHajimu UMEMOTO 			case IPV6_RTHDR:
1689f95d4633SHajimu UMEMOTO 			case IPV6_DSTOPTS:
1690f95d4633SHajimu UMEMOTO 			case IPV6_RTHDRDSTOPTS:
1691f95d4633SHajimu UMEMOTO 			case IPV6_NEXTHOP:
1692f95d4633SHajimu UMEMOTO 			{
169318b35df8SHajimu UMEMOTO 				/* new advanced API (RFC3542) */
1694f95d4633SHajimu UMEMOTO 				u_char *optbuf;
1695e770771aSHajimu UMEMOTO 				u_char optbuf_storage[MCLBYTES];
1696f95d4633SHajimu UMEMOTO 				int optlen;
1697f95d4633SHajimu UMEMOTO 				struct ip6_pktopts **optp;
1698f95d4633SHajimu UMEMOTO 
1699f95d4633SHajimu UMEMOTO 				/* cannot mix with RFC2292 */
1700f95d4633SHajimu UMEMOTO 				if (OPTBIT(IN6P_RFC2292)) {
1701f95d4633SHajimu UMEMOTO 					error = EINVAL;
1702f95d4633SHajimu UMEMOTO 					break;
1703f95d4633SHajimu UMEMOTO 				}
1704f95d4633SHajimu UMEMOTO 
1705e770771aSHajimu UMEMOTO 				/*
1706e770771aSHajimu UMEMOTO 				 * We only ensure valsize is not too large
1707e770771aSHajimu UMEMOTO 				 * here.  Further validation will be done
1708e770771aSHajimu UMEMOTO 				 * later.
1709e770771aSHajimu UMEMOTO 				 */
1710e770771aSHajimu UMEMOTO 				error = sooptcopyin(sopt, optbuf_storage,
1711e770771aSHajimu UMEMOTO 				    sizeof(optbuf_storage), 0);
1712a5d1aae3SHajimu UMEMOTO 				if (error)
1713a5d1aae3SHajimu UMEMOTO 					break;
1714f95d4633SHajimu UMEMOTO 				optlen = sopt->sopt_valsize;
1715e770771aSHajimu UMEMOTO 				optbuf = optbuf_storage;
1716f95d4633SHajimu UMEMOTO 				optp = &in6p->in6p_outputopts;
171779ba3952SBjoern A. Zeeb 				error = ip6_pcbopt(optname, optbuf, optlen,
171879ba3952SBjoern A. Zeeb 				    optp, (td != NULL) ? td->td_ucred : NULL,
171979ba3952SBjoern A. Zeeb 				    uproto);
1720f95d4633SHajimu UMEMOTO 				break;
1721f95d4633SHajimu UMEMOTO 			}
172282cd038dSYoshinobu Inoue #undef OPTSET
172382cd038dSYoshinobu Inoue 
172482cd038dSYoshinobu Inoue 			case IPV6_MULTICAST_IF:
172582cd038dSYoshinobu Inoue 			case IPV6_MULTICAST_HOPS:
172682cd038dSYoshinobu Inoue 			case IPV6_MULTICAST_LOOP:
172782cd038dSYoshinobu Inoue 			case IPV6_JOIN_GROUP:
172882cd038dSYoshinobu Inoue 			case IPV6_LEAVE_GROUP:
172933cde130SBruce M Simpson 			case IPV6_MSFILTER:
173033cde130SBruce M Simpson 			case MCAST_BLOCK_SOURCE:
173133cde130SBruce M Simpson 			case MCAST_UNBLOCK_SOURCE:
173233cde130SBruce M Simpson 			case MCAST_JOIN_GROUP:
173333cde130SBruce M Simpson 			case MCAST_LEAVE_GROUP:
173433cde130SBruce M Simpson 			case MCAST_JOIN_SOURCE_GROUP:
173533cde130SBruce M Simpson 			case MCAST_LEAVE_SOURCE_GROUP:
173633cde130SBruce M Simpson 				error = ip6_setmoptions(in6p, sopt);
173782cd038dSYoshinobu Inoue 				break;
173882cd038dSYoshinobu Inoue 
173982cd038dSYoshinobu Inoue 			case IPV6_PORTRANGE:
1740686cdd19SJun-ichiro itojun Hagino 				error = sooptcopyin(sopt, &optval,
1741686cdd19SJun-ichiro itojun Hagino 				    sizeof optval, sizeof optval);
174282cd038dSYoshinobu Inoue 				if (error)
174382cd038dSYoshinobu Inoue 					break;
174482cd038dSYoshinobu Inoue 
174582cd038dSYoshinobu Inoue 				switch (optval) {
174682cd038dSYoshinobu Inoue 				case IPV6_PORTRANGE_DEFAULT:
174797590249SBjoern A. Zeeb 					in6p->inp_flags &= ~(INP_LOWPORT);
174897590249SBjoern A. Zeeb 					in6p->inp_flags &= ~(INP_HIGHPORT);
174982cd038dSYoshinobu Inoue 					break;
175082cd038dSYoshinobu Inoue 
175182cd038dSYoshinobu Inoue 				case IPV6_PORTRANGE_HIGH:
175297590249SBjoern A. Zeeb 					in6p->inp_flags &= ~(INP_LOWPORT);
175397590249SBjoern A. Zeeb 					in6p->inp_flags |= INP_HIGHPORT;
175482cd038dSYoshinobu Inoue 					break;
175582cd038dSYoshinobu Inoue 
175682cd038dSYoshinobu Inoue 				case IPV6_PORTRANGE_LOW:
175797590249SBjoern A. Zeeb 					in6p->inp_flags &= ~(INP_HIGHPORT);
175897590249SBjoern A. Zeeb 					in6p->inp_flags |= INP_LOWPORT;
175982cd038dSYoshinobu Inoue 					break;
176082cd038dSYoshinobu Inoue 
176182cd038dSYoshinobu Inoue 				default:
176282cd038dSYoshinobu Inoue 					error = EINVAL;
176382cd038dSYoshinobu Inoue 					break;
176482cd038dSYoshinobu Inoue 				}
176582cd038dSYoshinobu Inoue 				break;
176682cd038dSYoshinobu Inoue 
1767b2630c29SGeorge V. Neville-Neil #ifdef IPSEC
176882cd038dSYoshinobu Inoue 			case IPV6_IPSEC_POLICY:
176982cd038dSYoshinobu Inoue 			{
1770c26fe973SBjoern A. Zeeb 				caddr_t req;
177182cd038dSYoshinobu Inoue 				struct mbuf *m;
177282cd038dSYoshinobu Inoue 
1773686cdd19SJun-ichiro itojun Hagino 				if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
177482cd038dSYoshinobu Inoue 					break;
1775686cdd19SJun-ichiro itojun Hagino 				if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
177682cd038dSYoshinobu Inoue 					break;
177782cd038dSYoshinobu Inoue 				req = mtod(m, caddr_t);
177897aa4a51SBjoern A. Zeeb 				error = ipsec_set_policy(in6p, optname, req,
1779c26fe973SBjoern A. Zeeb 				    m->m_len, (sopt->sopt_td != NULL) ?
1780c26fe973SBjoern A. Zeeb 				    sopt->sopt_td->td_ucred : NULL);
178182cd038dSYoshinobu Inoue 				m_freem(m);
178282cd038dSYoshinobu Inoue 				break;
1783c26fe973SBjoern A. Zeeb 			}
1784b2630c29SGeorge V. Neville-Neil #endif /* IPSEC */
178582cd038dSYoshinobu Inoue 
178682cd038dSYoshinobu Inoue 			default:
178782cd038dSYoshinobu Inoue 				error = ENOPROTOOPT;
178882cd038dSYoshinobu Inoue 				break;
178982cd038dSYoshinobu Inoue 			}
179082cd038dSYoshinobu Inoue 			break;
179182cd038dSYoshinobu Inoue 
179282cd038dSYoshinobu Inoue 		case SOPT_GET:
179382cd038dSYoshinobu Inoue 			switch (optname) {
179482cd038dSYoshinobu Inoue 
1795f95d4633SHajimu UMEMOTO 			case IPV6_2292PKTOPTIONS:
1796f95d4633SHajimu UMEMOTO #ifdef IPV6_PKTOPTIONS
179782cd038dSYoshinobu Inoue 			case IPV6_PKTOPTIONS:
1798f95d4633SHajimu UMEMOTO #endif
1799f95d4633SHajimu UMEMOTO 				/*
1800f95d4633SHajimu UMEMOTO 				 * RFC3542 (effectively) deprecated the
1801f95d4633SHajimu UMEMOTO 				 * semantics of the 2292-style pktoptions.
1802f95d4633SHajimu UMEMOTO 				 * Since it was not reliable in nature (i.e.,
1803f95d4633SHajimu UMEMOTO 				 * applications had to expect the lack of some
1804f95d4633SHajimu UMEMOTO 				 * information after all), it would make sense
1805f95d4633SHajimu UMEMOTO 				 * to simplify this part by always returning
1806f95d4633SHajimu UMEMOTO 				 * empty data.
1807f95d4633SHajimu UMEMOTO 				 */
180882cd038dSYoshinobu Inoue 				sopt->sopt_valsize = 0;
180982cd038dSYoshinobu Inoue 				break;
181082cd038dSYoshinobu Inoue 
1811f95d4633SHajimu UMEMOTO 			case IPV6_RECVHOPOPTS:
1812f95d4633SHajimu UMEMOTO 			case IPV6_RECVDSTOPTS:
1813f95d4633SHajimu UMEMOTO 			case IPV6_RECVRTHDRDSTOPTS:
181482cd038dSYoshinobu Inoue 			case IPV6_UNICAST_HOPS:
1815f95d4633SHajimu UMEMOTO 			case IPV6_RECVPKTINFO:
1816f95d4633SHajimu UMEMOTO 			case IPV6_RECVHOPLIMIT:
1817f95d4633SHajimu UMEMOTO 			case IPV6_RECVRTHDR:
1818f95d4633SHajimu UMEMOTO 			case IPV6_RECVPATHMTU:
181933841545SHajimu UMEMOTO 
182082cd038dSYoshinobu Inoue 			case IPV6_FAITH:
182133841545SHajimu UMEMOTO 			case IPV6_V6ONLY:
1822fa310a7eSYoshinobu Inoue 			case IPV6_PORTRANGE:
1823f95d4633SHajimu UMEMOTO 			case IPV6_RECVTCLASS:
1824f95d4633SHajimu UMEMOTO 			case IPV6_AUTOFLOWLABEL:
182582cd038dSYoshinobu Inoue 				switch (optname) {
182682cd038dSYoshinobu Inoue 
1827f95d4633SHajimu UMEMOTO 				case IPV6_RECVHOPOPTS:
1828f95d4633SHajimu UMEMOTO 					optval = OPTBIT(IN6P_HOPOPTS);
1829f95d4633SHajimu UMEMOTO 					break;
1830f95d4633SHajimu UMEMOTO 
1831f95d4633SHajimu UMEMOTO 				case IPV6_RECVDSTOPTS:
1832f95d4633SHajimu UMEMOTO 					optval = OPTBIT(IN6P_DSTOPTS);
1833f95d4633SHajimu UMEMOTO 					break;
1834f95d4633SHajimu UMEMOTO 
1835f95d4633SHajimu UMEMOTO 				case IPV6_RECVRTHDRDSTOPTS:
1836f95d4633SHajimu UMEMOTO 					optval = OPTBIT(IN6P_RTHDRDSTOPTS);
1837f95d4633SHajimu UMEMOTO 					break;
1838f95d4633SHajimu UMEMOTO 
183982cd038dSYoshinobu Inoue 				case IPV6_UNICAST_HOPS:
184082cd038dSYoshinobu Inoue 					optval = in6p->in6p_hops;
184182cd038dSYoshinobu Inoue 					break;
184282cd038dSYoshinobu Inoue 
1843f95d4633SHajimu UMEMOTO 				case IPV6_RECVPKTINFO:
1844f95d4633SHajimu UMEMOTO 					optval = OPTBIT(IN6P_PKTINFO);
1845f95d4633SHajimu UMEMOTO 					break;
1846f95d4633SHajimu UMEMOTO 
1847f95d4633SHajimu UMEMOTO 				case IPV6_RECVHOPLIMIT:
1848f95d4633SHajimu UMEMOTO 					optval = OPTBIT(IN6P_HOPLIMIT);
1849f95d4633SHajimu UMEMOTO 					break;
1850f95d4633SHajimu UMEMOTO 
1851f95d4633SHajimu UMEMOTO 				case IPV6_RECVRTHDR:
1852f95d4633SHajimu UMEMOTO 					optval = OPTBIT(IN6P_RTHDR);
1853f95d4633SHajimu UMEMOTO 					break;
1854f95d4633SHajimu UMEMOTO 
1855f95d4633SHajimu UMEMOTO 				case IPV6_RECVPATHMTU:
1856f95d4633SHajimu UMEMOTO 					optval = OPTBIT(IN6P_MTU);
185782cd038dSYoshinobu Inoue 					break;
185882cd038dSYoshinobu Inoue 
185982cd038dSYoshinobu Inoue 				case IPV6_FAITH:
186097590249SBjoern A. Zeeb 					optval = OPTBIT(INP_FAITH);
186182cd038dSYoshinobu Inoue 					break;
186282cd038dSYoshinobu Inoue 
186333841545SHajimu UMEMOTO 				case IPV6_V6ONLY:
1864854d3b19SHajimu UMEMOTO 					optval = OPTBIT(IN6P_IPV6_V6ONLY);
186582cd038dSYoshinobu Inoue 					break;
186682cd038dSYoshinobu Inoue 
186782cd038dSYoshinobu Inoue 				case IPV6_PORTRANGE:
186882cd038dSYoshinobu Inoue 				    {
186982cd038dSYoshinobu Inoue 					int flags;
1870fc384fa5SBjoern A. Zeeb 					flags = in6p->inp_flags;
187197590249SBjoern A. Zeeb 					if (flags & INP_HIGHPORT)
187282cd038dSYoshinobu Inoue 						optval = IPV6_PORTRANGE_HIGH;
187397590249SBjoern A. Zeeb 					else if (flags & INP_LOWPORT)
187482cd038dSYoshinobu Inoue 						optval = IPV6_PORTRANGE_LOW;
187582cd038dSYoshinobu Inoue 					else
187682cd038dSYoshinobu Inoue 						optval = 0;
187782cd038dSYoshinobu Inoue 					break;
187882cd038dSYoshinobu Inoue 				    }
1879f95d4633SHajimu UMEMOTO 				case IPV6_RECVTCLASS:
1880f95d4633SHajimu UMEMOTO 					optval = OPTBIT(IN6P_TCLASS);
1881f95d4633SHajimu UMEMOTO 					break;
1882f95d4633SHajimu UMEMOTO 
1883f95d4633SHajimu UMEMOTO 				case IPV6_AUTOFLOWLABEL:
1884f95d4633SHajimu UMEMOTO 					optval = OPTBIT(IN6P_AUTOFLOWLABEL);
1885f95d4633SHajimu UMEMOTO 					break;
1886f44270e7SPawel Jakub Dawidek 
1887f44270e7SPawel Jakub Dawidek 				case IPV6_BINDANY:
1888f44270e7SPawel Jakub Dawidek 					optval = OPTBIT(INP_BINDANY);
1889f44270e7SPawel Jakub Dawidek 					break;
189082cd038dSYoshinobu Inoue 				}
1891f95d4633SHajimu UMEMOTO 				if (error)
1892f95d4633SHajimu UMEMOTO 					break;
189382cd038dSYoshinobu Inoue 				error = sooptcopyout(sopt, &optval,
189482cd038dSYoshinobu Inoue 					sizeof optval);
189582cd038dSYoshinobu Inoue 				break;
189682cd038dSYoshinobu Inoue 
1897f95d4633SHajimu UMEMOTO 			case IPV6_PATHMTU:
1898f95d4633SHajimu UMEMOTO 			{
1899f95d4633SHajimu UMEMOTO 				u_long pmtu = 0;
1900f95d4633SHajimu UMEMOTO 				struct ip6_mtuinfo mtuinfo;
190197d8d152SAndre Oppermann 				struct route_in6 sro;
190297d8d152SAndre Oppermann 
190397d8d152SAndre Oppermann 				bzero(&sro, sizeof(sro));
1904f95d4633SHajimu UMEMOTO 
1905f95d4633SHajimu UMEMOTO 				if (!(so->so_state & SS_ISCONNECTED))
1906f95d4633SHajimu UMEMOTO 					return (ENOTCONN);
1907f95d4633SHajimu UMEMOTO 				/*
1908f95d4633SHajimu UMEMOTO 				 * XXX: we dot not consider the case of source
1909f95d4633SHajimu UMEMOTO 				 * routing, or optional information to specify
1910f95d4633SHajimu UMEMOTO 				 * the outgoing interface.
1911f95d4633SHajimu UMEMOTO 				 */
191297d8d152SAndre Oppermann 				error = ip6_getpmtu(&sro, NULL, NULL,
1913f95d4633SHajimu UMEMOTO 				    &in6p->in6p_faddr, &pmtu, NULL);
191497d8d152SAndre Oppermann 				if (sro.ro_rt)
191597d8d152SAndre Oppermann 					RTFREE(sro.ro_rt);
1916f95d4633SHajimu UMEMOTO 				if (error)
1917f95d4633SHajimu UMEMOTO 					break;
1918f95d4633SHajimu UMEMOTO 				if (pmtu > IPV6_MAXPACKET)
1919f95d4633SHajimu UMEMOTO 					pmtu = IPV6_MAXPACKET;
1920f95d4633SHajimu UMEMOTO 
1921f95d4633SHajimu UMEMOTO 				bzero(&mtuinfo, sizeof(mtuinfo));
1922f95d4633SHajimu UMEMOTO 				mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
1923f95d4633SHajimu UMEMOTO 				optdata = (void *)&mtuinfo;
1924f95d4633SHajimu UMEMOTO 				optdatalen = sizeof(mtuinfo);
1925f95d4633SHajimu UMEMOTO 				error = sooptcopyout(sopt, optdata,
1926f95d4633SHajimu UMEMOTO 				    optdatalen);
1927f95d4633SHajimu UMEMOTO 				break;
1928f95d4633SHajimu UMEMOTO 			}
1929f95d4633SHajimu UMEMOTO 
1930f95d4633SHajimu UMEMOTO 			case IPV6_2292PKTINFO:
1931f95d4633SHajimu UMEMOTO 			case IPV6_2292HOPLIMIT:
1932f95d4633SHajimu UMEMOTO 			case IPV6_2292HOPOPTS:
1933f95d4633SHajimu UMEMOTO 			case IPV6_2292RTHDR:
1934f95d4633SHajimu UMEMOTO 			case IPV6_2292DSTOPTS:
193533841545SHajimu UMEMOTO 				switch (optname) {
1936f95d4633SHajimu UMEMOTO 				case IPV6_2292PKTINFO:
193733841545SHajimu UMEMOTO 					optval = OPTBIT(IN6P_PKTINFO);
193833841545SHajimu UMEMOTO 					break;
1939f95d4633SHajimu UMEMOTO 				case IPV6_2292HOPLIMIT:
194033841545SHajimu UMEMOTO 					optval = OPTBIT(IN6P_HOPLIMIT);
194133841545SHajimu UMEMOTO 					break;
1942f95d4633SHajimu UMEMOTO 				case IPV6_2292HOPOPTS:
194333841545SHajimu UMEMOTO 					optval = OPTBIT(IN6P_HOPOPTS);
194433841545SHajimu UMEMOTO 					break;
1945f95d4633SHajimu UMEMOTO 				case IPV6_2292RTHDR:
194633841545SHajimu UMEMOTO 					optval = OPTBIT(IN6P_RTHDR);
194733841545SHajimu UMEMOTO 					break;
1948f95d4633SHajimu UMEMOTO 				case IPV6_2292DSTOPTS:
194933841545SHajimu UMEMOTO 					optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
195033841545SHajimu UMEMOTO 					break;
195133841545SHajimu UMEMOTO 				}
195233841545SHajimu UMEMOTO 				error = sooptcopyout(sopt, &optval,
195333841545SHajimu UMEMOTO 				    sizeof optval);
195433841545SHajimu UMEMOTO 				break;
1955f95d4633SHajimu UMEMOTO 			case IPV6_PKTINFO:
1956f95d4633SHajimu UMEMOTO 			case IPV6_HOPOPTS:
1957f95d4633SHajimu UMEMOTO 			case IPV6_RTHDR:
1958f95d4633SHajimu UMEMOTO 			case IPV6_DSTOPTS:
1959f95d4633SHajimu UMEMOTO 			case IPV6_RTHDRDSTOPTS:
1960f95d4633SHajimu UMEMOTO 			case IPV6_NEXTHOP:
1961f95d4633SHajimu UMEMOTO 			case IPV6_TCLASS:
1962f95d4633SHajimu UMEMOTO 			case IPV6_DONTFRAG:
1963f95d4633SHajimu UMEMOTO 			case IPV6_USE_MIN_MTU:
1964f95d4633SHajimu UMEMOTO 			case IPV6_PREFER_TEMPADDR:
1965f95d4633SHajimu UMEMOTO 				error = ip6_getpcbopt(in6p->in6p_outputopts,
1966f95d4633SHajimu UMEMOTO 				    optname, sopt);
1967f95d4633SHajimu UMEMOTO 				break;
196833841545SHajimu UMEMOTO 
196982cd038dSYoshinobu Inoue 			case IPV6_MULTICAST_IF:
197082cd038dSYoshinobu Inoue 			case IPV6_MULTICAST_HOPS:
197182cd038dSYoshinobu Inoue 			case IPV6_MULTICAST_LOOP:
197233cde130SBruce M Simpson 			case IPV6_MSFILTER:
197333cde130SBruce M Simpson 				error = ip6_getmoptions(in6p, sopt);
197482cd038dSYoshinobu Inoue 				break;
197582cd038dSYoshinobu Inoue 
1976b2630c29SGeorge V. Neville-Neil #ifdef IPSEC
197782cd038dSYoshinobu Inoue 			case IPV6_IPSEC_POLICY:
197882cd038dSYoshinobu Inoue 			  {
1979f63e7634SYoshinobu Inoue 				caddr_t req = NULL;
1980686cdd19SJun-ichiro itojun Hagino 				size_t len = 0;
1981686cdd19SJun-ichiro itojun Hagino 				struct mbuf *m = NULL;
1982686cdd19SJun-ichiro itojun Hagino 				struct mbuf **mp = &m;
1983f95d4633SHajimu UMEMOTO 				size_t ovalsize = sopt->sopt_valsize;
1984f95d4633SHajimu UMEMOTO 				caddr_t oval = (caddr_t)sopt->sopt_val;
1985f63e7634SYoshinobu Inoue 
1986686cdd19SJun-ichiro itojun Hagino 				error = soopt_getm(sopt, &m); /* XXX */
1987a46f7e7cSHajimu UMEMOTO 				if (error != 0)
1988686cdd19SJun-ichiro itojun Hagino 					break;
1989686cdd19SJun-ichiro itojun Hagino 				error = soopt_mcopyin(sopt, m); /* XXX */
1990a46f7e7cSHajimu UMEMOTO 				if (error != 0)
1991686cdd19SJun-ichiro itojun Hagino 					break;
1992f95d4633SHajimu UMEMOTO 				sopt->sopt_valsize = ovalsize;
1993f95d4633SHajimu UMEMOTO 				sopt->sopt_val = oval;
1994686cdd19SJun-ichiro itojun Hagino 				if (m) {
199582cd038dSYoshinobu Inoue 					req = mtod(m, caddr_t);
1996686cdd19SJun-ichiro itojun Hagino 					len = m->m_len;
1997686cdd19SJun-ichiro itojun Hagino 				}
199897aa4a51SBjoern A. Zeeb 				error = ipsec_get_policy(in6p, req, len, mp);
199982cd038dSYoshinobu Inoue 				if (error == 0)
200082cd038dSYoshinobu Inoue 					error = soopt_mcopyout(sopt, m); /* XXX */
200133841545SHajimu UMEMOTO 				if (error == 0 && m)
200282cd038dSYoshinobu Inoue 					m_freem(m);
200382cd038dSYoshinobu Inoue 				break;
200482cd038dSYoshinobu Inoue 			  }
2005b2630c29SGeorge V. Neville-Neil #endif /* IPSEC */
200682cd038dSYoshinobu Inoue 
200782cd038dSYoshinobu Inoue 			default:
200882cd038dSYoshinobu Inoue 				error = ENOPROTOOPT;
200982cd038dSYoshinobu Inoue 				break;
201082cd038dSYoshinobu Inoue 			}
201182cd038dSYoshinobu Inoue 			break;
201282cd038dSYoshinobu Inoue 		}
2013f95d4633SHajimu UMEMOTO 	} else {		/* level != IPPROTO_IPV6 */
201482cd038dSYoshinobu Inoue 		error = EINVAL;
201582cd038dSYoshinobu Inoue 	}
201682cd038dSYoshinobu Inoue 	return (error);
201782cd038dSYoshinobu Inoue }
201882cd038dSYoshinobu Inoue 
201902b9a206SHajimu UMEMOTO int
20201272577eSXin LI ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
202102b9a206SHajimu UMEMOTO {
202202b9a206SHajimu UMEMOTO 	int error = 0, optval, optlen;
202302b9a206SHajimu UMEMOTO 	const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2024fc384fa5SBjoern A. Zeeb 	struct inpcb *in6p = sotoinpcb(so);
202502b9a206SHajimu UMEMOTO 	int level, op, optname;
202602b9a206SHajimu UMEMOTO 
202702b9a206SHajimu UMEMOTO 	level = sopt->sopt_level;
202802b9a206SHajimu UMEMOTO 	op = sopt->sopt_dir;
202902b9a206SHajimu UMEMOTO 	optname = sopt->sopt_name;
203002b9a206SHajimu UMEMOTO 	optlen = sopt->sopt_valsize;
203102b9a206SHajimu UMEMOTO 
203202b9a206SHajimu UMEMOTO 	if (level != IPPROTO_IPV6) {
203302b9a206SHajimu UMEMOTO 		return (EINVAL);
203402b9a206SHajimu UMEMOTO 	}
203502b9a206SHajimu UMEMOTO 
203602b9a206SHajimu UMEMOTO 	switch (optname) {
203702b9a206SHajimu UMEMOTO 	case IPV6_CHECKSUM:
203802b9a206SHajimu UMEMOTO 		/*
203902b9a206SHajimu UMEMOTO 		 * For ICMPv6 sockets, no modification allowed for checksum
204002b9a206SHajimu UMEMOTO 		 * offset, permit "no change" values to help existing apps.
204102b9a206SHajimu UMEMOTO 		 *
204218b35df8SHajimu UMEMOTO 		 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
204302b9a206SHajimu UMEMOTO 		 * for an ICMPv6 socket will fail."
204418b35df8SHajimu UMEMOTO 		 * The current behavior does not meet RFC3542.
204502b9a206SHajimu UMEMOTO 		 */
204602b9a206SHajimu UMEMOTO 		switch (op) {
204702b9a206SHajimu UMEMOTO 		case SOPT_SET:
204802b9a206SHajimu UMEMOTO 			if (optlen != sizeof(int)) {
204902b9a206SHajimu UMEMOTO 				error = EINVAL;
205002b9a206SHajimu UMEMOTO 				break;
205102b9a206SHajimu UMEMOTO 			}
205202b9a206SHajimu UMEMOTO 			error = sooptcopyin(sopt, &optval, sizeof(optval),
205302b9a206SHajimu UMEMOTO 					    sizeof(optval));
205402b9a206SHajimu UMEMOTO 			if (error)
205502b9a206SHajimu UMEMOTO 				break;
205602b9a206SHajimu UMEMOTO 			if ((optval % 2) != 0) {
205702b9a206SHajimu UMEMOTO 				/* the API assumes even offset values */
205802b9a206SHajimu UMEMOTO 				error = EINVAL;
205902b9a206SHajimu UMEMOTO 			} else if (so->so_proto->pr_protocol ==
206002b9a206SHajimu UMEMOTO 			    IPPROTO_ICMPV6) {
206102b9a206SHajimu UMEMOTO 				if (optval != icmp6off)
206202b9a206SHajimu UMEMOTO 					error = EINVAL;
206302b9a206SHajimu UMEMOTO 			} else
206402b9a206SHajimu UMEMOTO 				in6p->in6p_cksum = optval;
206502b9a206SHajimu UMEMOTO 			break;
206602b9a206SHajimu UMEMOTO 
206702b9a206SHajimu UMEMOTO 		case SOPT_GET:
206802b9a206SHajimu UMEMOTO 			if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
206902b9a206SHajimu UMEMOTO 				optval = icmp6off;
207002b9a206SHajimu UMEMOTO 			else
207102b9a206SHajimu UMEMOTO 				optval = in6p->in6p_cksum;
207202b9a206SHajimu UMEMOTO 
207302b9a206SHajimu UMEMOTO 			error = sooptcopyout(sopt, &optval, sizeof(optval));
207402b9a206SHajimu UMEMOTO 			break;
207502b9a206SHajimu UMEMOTO 
207602b9a206SHajimu UMEMOTO 		default:
207702b9a206SHajimu UMEMOTO 			error = EINVAL;
207802b9a206SHajimu UMEMOTO 			break;
207902b9a206SHajimu UMEMOTO 		}
208002b9a206SHajimu UMEMOTO 		break;
208102b9a206SHajimu UMEMOTO 
208202b9a206SHajimu UMEMOTO 	default:
208302b9a206SHajimu UMEMOTO 		error = ENOPROTOOPT;
208402b9a206SHajimu UMEMOTO 		break;
208502b9a206SHajimu UMEMOTO 	}
208602b9a206SHajimu UMEMOTO 
208702b9a206SHajimu UMEMOTO 	return (error);
208802b9a206SHajimu UMEMOTO }
208902b9a206SHajimu UMEMOTO 
209082cd038dSYoshinobu Inoue /*
209133841545SHajimu UMEMOTO  * Set up IP6 options in pcb for insertion in output packets or
209233841545SHajimu UMEMOTO  * specifying behavior of outgoing packets.
209382cd038dSYoshinobu Inoue  */
209482cd038dSYoshinobu Inoue static int
20951272577eSXin LI ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
20961272577eSXin LI     struct socket *so, struct sockopt *sopt)
209782cd038dSYoshinobu Inoue {
209833841545SHajimu UMEMOTO 	struct ip6_pktopts *opt = *pktopt;
209982cd038dSYoshinobu Inoue 	int error = 0;
2100b40ce416SJulian Elischer 	struct thread *td = sopt->sopt_td;
210182cd038dSYoshinobu Inoue 
210282cd038dSYoshinobu Inoue 	/* turn off any old options. */
210382cd038dSYoshinobu Inoue 	if (opt) {
210433841545SHajimu UMEMOTO #ifdef DIAGNOSTIC
210533841545SHajimu UMEMOTO 		if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
210633841545SHajimu UMEMOTO 		    opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
210733841545SHajimu UMEMOTO 		    opt->ip6po_rhinfo.ip6po_rhi_rthdr)
210833841545SHajimu UMEMOTO 			printf("ip6_pcbopts: all specified options are cleared.\n");
210933841545SHajimu UMEMOTO #endif
2110f95d4633SHajimu UMEMOTO 		ip6_clearpktopts(opt, -1);
211182cd038dSYoshinobu Inoue 	} else
2112a163d034SWarner Losh 		opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
211333841545SHajimu UMEMOTO 	*pktopt = NULL;
211482cd038dSYoshinobu Inoue 
211582cd038dSYoshinobu Inoue 	if (!m || m->m_len == 0) {
211682cd038dSYoshinobu Inoue 		/*
211735f6695bSHajimu UMEMOTO 		 * Only turning off any previous options, regardless of
211835f6695bSHajimu UMEMOTO 		 * whether the opt is just created or given.
211982cd038dSYoshinobu Inoue 		 */
212082cd038dSYoshinobu Inoue 		free(opt, M_IP6OPT);
212182cd038dSYoshinobu Inoue 		return (0);
212282cd038dSYoshinobu Inoue 	}
212382cd038dSYoshinobu Inoue 
212482cd038dSYoshinobu Inoue 	/*  set options specified by user. */
212579ba3952SBjoern A. Zeeb 	if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
212679ba3952SBjoern A. Zeeb 	    td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2127f95d4633SHajimu UMEMOTO 		ip6_clearpktopts(opt, -1); /* XXX: discard all options */
212835f6695bSHajimu UMEMOTO 		free(opt, M_IP6OPT);
212982cd038dSYoshinobu Inoue 		return (error);
213082cd038dSYoshinobu Inoue 	}
213182cd038dSYoshinobu Inoue 	*pktopt = opt;
213282cd038dSYoshinobu Inoue 	return (0);
213382cd038dSYoshinobu Inoue }
213482cd038dSYoshinobu Inoue 
213582cd038dSYoshinobu Inoue /*
213633841545SHajimu UMEMOTO  * initialize ip6_pktopts.  beware that there are non-zero default values in
213733841545SHajimu UMEMOTO  * the struct.
213833841545SHajimu UMEMOTO  */
213933841545SHajimu UMEMOTO void
21401272577eSXin LI ip6_initpktopts(struct ip6_pktopts *opt)
214133841545SHajimu UMEMOTO {
214233841545SHajimu UMEMOTO 
214333841545SHajimu UMEMOTO 	bzero(opt, sizeof(*opt));
214433841545SHajimu UMEMOTO 	opt->ip6po_hlim = -1;	/* -1 means default hop limit */
2145f95d4633SHajimu UMEMOTO 	opt->ip6po_tclass = -1;	/* -1 means default traffic class */
2146f95d4633SHajimu UMEMOTO 	opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2147f95d4633SHajimu UMEMOTO 	opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2148f95d4633SHajimu UMEMOTO }
2149f95d4633SHajimu UMEMOTO 
2150f95d4633SHajimu UMEMOTO static int
21511272577eSXin LI ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
215279ba3952SBjoern A. Zeeb     struct ucred *cred, int uproto)
2153f95d4633SHajimu UMEMOTO {
2154f95d4633SHajimu UMEMOTO 	struct ip6_pktopts *opt;
2155f95d4633SHajimu UMEMOTO 
2156f95d4633SHajimu UMEMOTO 	if (*pktopt == NULL) {
2157f95d4633SHajimu UMEMOTO 		*pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2158f95d4633SHajimu UMEMOTO 		    M_WAITOK);
2159d5e3406dSHajimu UMEMOTO 		ip6_initpktopts(*pktopt);
2160f95d4633SHajimu UMEMOTO 	}
2161f95d4633SHajimu UMEMOTO 	opt = *pktopt;
2162f95d4633SHajimu UMEMOTO 
216379ba3952SBjoern A. Zeeb 	return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
2164f95d4633SHajimu UMEMOTO }
2165f95d4633SHajimu UMEMOTO 
2166f95d4633SHajimu UMEMOTO static int
21671272577eSXin LI ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt)
2168f95d4633SHajimu UMEMOTO {
2169f95d4633SHajimu UMEMOTO 	void *optdata = NULL;
2170f95d4633SHajimu UMEMOTO 	int optdatalen = 0;
2171f95d4633SHajimu UMEMOTO 	struct ip6_ext *ip6e;
2172f95d4633SHajimu UMEMOTO 	int error = 0;
2173f95d4633SHajimu UMEMOTO 	struct in6_pktinfo null_pktinfo;
2174f95d4633SHajimu UMEMOTO 	int deftclass = 0, on;
2175f95d4633SHajimu UMEMOTO 	int defminmtu = IP6PO_MINMTU_MCASTONLY;
2176f95d4633SHajimu UMEMOTO 	int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2177f95d4633SHajimu UMEMOTO 
2178f95d4633SHajimu UMEMOTO 	switch (optname) {
2179f95d4633SHajimu UMEMOTO 	case IPV6_PKTINFO:
2180f95d4633SHajimu UMEMOTO 		if (pktopt && pktopt->ip6po_pktinfo)
2181f95d4633SHajimu UMEMOTO 			optdata = (void *)pktopt->ip6po_pktinfo;
2182f95d4633SHajimu UMEMOTO 		else {
2183f95d4633SHajimu UMEMOTO 			/* XXX: we don't have to do this every time... */
2184f95d4633SHajimu UMEMOTO 			bzero(&null_pktinfo, sizeof(null_pktinfo));
2185f95d4633SHajimu UMEMOTO 			optdata = (void *)&null_pktinfo;
2186f95d4633SHajimu UMEMOTO 		}
2187f95d4633SHajimu UMEMOTO 		optdatalen = sizeof(struct in6_pktinfo);
2188f95d4633SHajimu UMEMOTO 		break;
2189f95d4633SHajimu UMEMOTO 	case IPV6_TCLASS:
2190f95d4633SHajimu UMEMOTO 		if (pktopt && pktopt->ip6po_tclass >= 0)
2191f95d4633SHajimu UMEMOTO 			optdata = (void *)&pktopt->ip6po_tclass;
2192f95d4633SHajimu UMEMOTO 		else
2193f95d4633SHajimu UMEMOTO 			optdata = (void *)&deftclass;
2194f95d4633SHajimu UMEMOTO 		optdatalen = sizeof(int);
2195f95d4633SHajimu UMEMOTO 		break;
2196f95d4633SHajimu UMEMOTO 	case IPV6_HOPOPTS:
2197f95d4633SHajimu UMEMOTO 		if (pktopt && pktopt->ip6po_hbh) {
2198f95d4633SHajimu UMEMOTO 			optdata = (void *)pktopt->ip6po_hbh;
2199f95d4633SHajimu UMEMOTO 			ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
2200f95d4633SHajimu UMEMOTO 			optdatalen = (ip6e->ip6e_len + 1) << 3;
2201f95d4633SHajimu UMEMOTO 		}
2202f95d4633SHajimu UMEMOTO 		break;
2203f95d4633SHajimu UMEMOTO 	case IPV6_RTHDR:
2204f95d4633SHajimu UMEMOTO 		if (pktopt && pktopt->ip6po_rthdr) {
2205f95d4633SHajimu UMEMOTO 			optdata = (void *)pktopt->ip6po_rthdr;
2206f95d4633SHajimu UMEMOTO 			ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
2207f95d4633SHajimu UMEMOTO 			optdatalen = (ip6e->ip6e_len + 1) << 3;
2208f95d4633SHajimu UMEMOTO 		}
2209f95d4633SHajimu UMEMOTO 		break;
2210f95d4633SHajimu UMEMOTO 	case IPV6_RTHDRDSTOPTS:
2211f95d4633SHajimu UMEMOTO 		if (pktopt && pktopt->ip6po_dest1) {
2212f95d4633SHajimu UMEMOTO 			optdata = (void *)pktopt->ip6po_dest1;
2213f95d4633SHajimu UMEMOTO 			ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
2214f95d4633SHajimu UMEMOTO 			optdatalen = (ip6e->ip6e_len + 1) << 3;
2215f95d4633SHajimu UMEMOTO 		}
2216f95d4633SHajimu UMEMOTO 		break;
2217f95d4633SHajimu UMEMOTO 	case IPV6_DSTOPTS:
2218f95d4633SHajimu UMEMOTO 		if (pktopt && pktopt->ip6po_dest2) {
2219f95d4633SHajimu UMEMOTO 			optdata = (void *)pktopt->ip6po_dest2;
2220f95d4633SHajimu UMEMOTO 			ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
2221f95d4633SHajimu UMEMOTO 			optdatalen = (ip6e->ip6e_len + 1) << 3;
2222f95d4633SHajimu UMEMOTO 		}
2223f95d4633SHajimu UMEMOTO 		break;
2224f95d4633SHajimu UMEMOTO 	case IPV6_NEXTHOP:
2225f95d4633SHajimu UMEMOTO 		if (pktopt && pktopt->ip6po_nexthop) {
2226f95d4633SHajimu UMEMOTO 			optdata = (void *)pktopt->ip6po_nexthop;
2227f95d4633SHajimu UMEMOTO 			optdatalen = pktopt->ip6po_nexthop->sa_len;
2228f95d4633SHajimu UMEMOTO 		}
2229f95d4633SHajimu UMEMOTO 		break;
2230f95d4633SHajimu UMEMOTO 	case IPV6_USE_MIN_MTU:
2231f95d4633SHajimu UMEMOTO 		if (pktopt)
2232f95d4633SHajimu UMEMOTO 			optdata = (void *)&pktopt->ip6po_minmtu;
2233f95d4633SHajimu UMEMOTO 		else
2234f95d4633SHajimu UMEMOTO 			optdata = (void *)&defminmtu;
2235f95d4633SHajimu UMEMOTO 		optdatalen = sizeof(int);
2236f95d4633SHajimu UMEMOTO 		break;
2237f95d4633SHajimu UMEMOTO 	case IPV6_DONTFRAG:
2238f95d4633SHajimu UMEMOTO 		if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2239f95d4633SHajimu UMEMOTO 			on = 1;
2240f95d4633SHajimu UMEMOTO 		else
2241f95d4633SHajimu UMEMOTO 			on = 0;
2242f95d4633SHajimu UMEMOTO 		optdata = (void *)&on;
2243f95d4633SHajimu UMEMOTO 		optdatalen = sizeof(on);
2244f95d4633SHajimu UMEMOTO 		break;
2245f95d4633SHajimu UMEMOTO 	case IPV6_PREFER_TEMPADDR:
2246f95d4633SHajimu UMEMOTO 		if (pktopt)
2247f95d4633SHajimu UMEMOTO 			optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
2248f95d4633SHajimu UMEMOTO 		else
2249f95d4633SHajimu UMEMOTO 			optdata = (void *)&defpreftemp;
2250f95d4633SHajimu UMEMOTO 		optdatalen = sizeof(int);
2251f95d4633SHajimu UMEMOTO 		break;
2252f95d4633SHajimu UMEMOTO 	default:		/* should not happen */
2253f95d4633SHajimu UMEMOTO #ifdef DIAGNOSTIC
2254f95d4633SHajimu UMEMOTO 		panic("ip6_getpcbopt: unexpected option\n");
2255f95d4633SHajimu UMEMOTO #endif
2256f95d4633SHajimu UMEMOTO 		return (ENOPROTOOPT);
2257f95d4633SHajimu UMEMOTO 	}
2258f95d4633SHajimu UMEMOTO 
2259f95d4633SHajimu UMEMOTO 	error = sooptcopyout(sopt, optdata, optdatalen);
2260f95d4633SHajimu UMEMOTO 
2261f95d4633SHajimu UMEMOTO 	return (error);
226233841545SHajimu UMEMOTO }
226333841545SHajimu UMEMOTO 
226433841545SHajimu UMEMOTO void
22651272577eSXin LI ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
226633841545SHajimu UMEMOTO {
2267289b28bdSHajimu UMEMOTO 	if (pktopt == NULL)
2268289b28bdSHajimu UMEMOTO 		return;
2269289b28bdSHajimu UMEMOTO 
2270f95d4633SHajimu UMEMOTO 	if (optname == -1 || optname == IPV6_PKTINFO) {
2271885adbfaSHajimu UMEMOTO 		if (pktopt->ip6po_pktinfo)
227233841545SHajimu UMEMOTO 			free(pktopt->ip6po_pktinfo, M_IP6OPT);
227333841545SHajimu UMEMOTO 		pktopt->ip6po_pktinfo = NULL;
227433841545SHajimu UMEMOTO 	}
2275f95d4633SHajimu UMEMOTO 	if (optname == -1 || optname == IPV6_HOPLIMIT)
227633841545SHajimu UMEMOTO 		pktopt->ip6po_hlim = -1;
2277f95d4633SHajimu UMEMOTO 	if (optname == -1 || optname == IPV6_TCLASS)
2278f95d4633SHajimu UMEMOTO 		pktopt->ip6po_tclass = -1;
2279f95d4633SHajimu UMEMOTO 	if (optname == -1 || optname == IPV6_NEXTHOP) {
2280f95d4633SHajimu UMEMOTO 		if (pktopt->ip6po_nextroute.ro_rt) {
2281f95d4633SHajimu UMEMOTO 			RTFREE(pktopt->ip6po_nextroute.ro_rt);
2282f95d4633SHajimu UMEMOTO 			pktopt->ip6po_nextroute.ro_rt = NULL;
2283f95d4633SHajimu UMEMOTO 		}
2284885adbfaSHajimu UMEMOTO 		if (pktopt->ip6po_nexthop)
228533841545SHajimu UMEMOTO 			free(pktopt->ip6po_nexthop, M_IP6OPT);
228633841545SHajimu UMEMOTO 		pktopt->ip6po_nexthop = NULL;
228733841545SHajimu UMEMOTO 	}
2288f95d4633SHajimu UMEMOTO 	if (optname == -1 || optname == IPV6_HOPOPTS) {
2289885adbfaSHajimu UMEMOTO 		if (pktopt->ip6po_hbh)
229033841545SHajimu UMEMOTO 			free(pktopt->ip6po_hbh, M_IP6OPT);
229133841545SHajimu UMEMOTO 		pktopt->ip6po_hbh = NULL;
229233841545SHajimu UMEMOTO 	}
2293f95d4633SHajimu UMEMOTO 	if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2294885adbfaSHajimu UMEMOTO 		if (pktopt->ip6po_dest1)
229533841545SHajimu UMEMOTO 			free(pktopt->ip6po_dest1, M_IP6OPT);
229633841545SHajimu UMEMOTO 		pktopt->ip6po_dest1 = NULL;
229733841545SHajimu UMEMOTO 	}
2298f95d4633SHajimu UMEMOTO 	if (optname == -1 || optname == IPV6_RTHDR) {
2299885adbfaSHajimu UMEMOTO 		if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
230033841545SHajimu UMEMOTO 			free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
230133841545SHajimu UMEMOTO 		pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
230233841545SHajimu UMEMOTO 		if (pktopt->ip6po_route.ro_rt) {
230333841545SHajimu UMEMOTO 			RTFREE(pktopt->ip6po_route.ro_rt);
230433841545SHajimu UMEMOTO 			pktopt->ip6po_route.ro_rt = NULL;
230533841545SHajimu UMEMOTO 		}
230633841545SHajimu UMEMOTO 	}
2307f95d4633SHajimu UMEMOTO 	if (optname == -1 || optname == IPV6_DSTOPTS) {
2308885adbfaSHajimu UMEMOTO 		if (pktopt->ip6po_dest2)
230933841545SHajimu UMEMOTO 			free(pktopt->ip6po_dest2, M_IP6OPT);
231033841545SHajimu UMEMOTO 		pktopt->ip6po_dest2 = NULL;
231133841545SHajimu UMEMOTO 	}
231233841545SHajimu UMEMOTO }
231333841545SHajimu UMEMOTO 
231433841545SHajimu UMEMOTO #define PKTOPT_EXTHDRCPY(type) \
231533841545SHajimu UMEMOTO do {\
231633841545SHajimu UMEMOTO 	if (src->type) {\
23177efe5d92SHajimu UMEMOTO 		int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
231833841545SHajimu UMEMOTO 		dst->type = malloc(hlen, M_IP6OPT, canwait);\
231933841545SHajimu UMEMOTO 		if (dst->type == NULL && canwait == M_NOWAIT)\
232033841545SHajimu UMEMOTO 			goto bad;\
232133841545SHajimu UMEMOTO 		bcopy(src->type, dst->type, hlen);\
232233841545SHajimu UMEMOTO 	}\
23237efe5d92SHajimu UMEMOTO } while (/*CONSTCOND*/ 0)
232433841545SHajimu UMEMOTO 
2325885adbfaSHajimu UMEMOTO static int
23261272577eSXin LI copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
232733841545SHajimu UMEMOTO {
2328885adbfaSHajimu UMEMOTO 	if (dst == NULL || src == NULL)  {
232933841545SHajimu UMEMOTO 		printf("ip6_clearpktopts: invalid argument\n");
2330885adbfaSHajimu UMEMOTO 		return (EINVAL);
233133841545SHajimu UMEMOTO 	}
233233841545SHajimu UMEMOTO 
233333841545SHajimu UMEMOTO 	dst->ip6po_hlim = src->ip6po_hlim;
2334f95d4633SHajimu UMEMOTO 	dst->ip6po_tclass = src->ip6po_tclass;
2335f95d4633SHajimu UMEMOTO 	dst->ip6po_flags = src->ip6po_flags;
233633841545SHajimu UMEMOTO 	if (src->ip6po_pktinfo) {
233733841545SHajimu UMEMOTO 		dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
233833841545SHajimu UMEMOTO 		    M_IP6OPT, canwait);
23392cb64cb2SGeorge V. Neville-Neil 		if (dst->ip6po_pktinfo == NULL)
234033841545SHajimu UMEMOTO 			goto bad;
234133841545SHajimu UMEMOTO 		*dst->ip6po_pktinfo = *src->ip6po_pktinfo;
234233841545SHajimu UMEMOTO 	}
234333841545SHajimu UMEMOTO 	if (src->ip6po_nexthop) {
234433841545SHajimu UMEMOTO 		dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
234533841545SHajimu UMEMOTO 		    M_IP6OPT, canwait);
2346403cbcf5SGeorge V. Neville-Neil 		if (dst->ip6po_nexthop == NULL)
234733841545SHajimu UMEMOTO 			goto bad;
234833841545SHajimu UMEMOTO 		bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
234933841545SHajimu UMEMOTO 		    src->ip6po_nexthop->sa_len);
235033841545SHajimu UMEMOTO 	}
235133841545SHajimu UMEMOTO 	PKTOPT_EXTHDRCPY(ip6po_hbh);
235233841545SHajimu UMEMOTO 	PKTOPT_EXTHDRCPY(ip6po_dest1);
235333841545SHajimu UMEMOTO 	PKTOPT_EXTHDRCPY(ip6po_dest2);
235433841545SHajimu UMEMOTO 	PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2355885adbfaSHajimu UMEMOTO 	return (0);
235633841545SHajimu UMEMOTO 
235733841545SHajimu UMEMOTO   bad:
2358016fb9d9SMike Makonnen 	ip6_clearpktopts(dst, -1);
2359885adbfaSHajimu UMEMOTO 	return (ENOBUFS);
2360885adbfaSHajimu UMEMOTO }
2361885adbfaSHajimu UMEMOTO #undef PKTOPT_EXTHDRCPY
2362885adbfaSHajimu UMEMOTO 
2363885adbfaSHajimu UMEMOTO struct ip6_pktopts *
23641272577eSXin LI ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2365885adbfaSHajimu UMEMOTO {
2366885adbfaSHajimu UMEMOTO 	int error;
2367885adbfaSHajimu UMEMOTO 	struct ip6_pktopts *dst;
2368885adbfaSHajimu UMEMOTO 
2369885adbfaSHajimu UMEMOTO 	dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
23702cb64cb2SGeorge V. Neville-Neil 	if (dst == NULL)
2371885adbfaSHajimu UMEMOTO 		return (NULL);
2372885adbfaSHajimu UMEMOTO 	ip6_initpktopts(dst);
2373885adbfaSHajimu UMEMOTO 
2374885adbfaSHajimu UMEMOTO 	if ((error = copypktopts(dst, src, canwait)) != 0) {
237535f6695bSHajimu UMEMOTO 		free(dst, M_IP6OPT);
237633841545SHajimu UMEMOTO 		return (NULL);
237733841545SHajimu UMEMOTO 	}
2378885adbfaSHajimu UMEMOTO 
2379885adbfaSHajimu UMEMOTO 	return (dst);
2380885adbfaSHajimu UMEMOTO }
238133841545SHajimu UMEMOTO 
238233841545SHajimu UMEMOTO void
23831272577eSXin LI ip6_freepcbopts(struct ip6_pktopts *pktopt)
238433841545SHajimu UMEMOTO {
238533841545SHajimu UMEMOTO 	if (pktopt == NULL)
238633841545SHajimu UMEMOTO 		return;
238733841545SHajimu UMEMOTO 
2388f95d4633SHajimu UMEMOTO 	ip6_clearpktopts(pktopt, -1);
238933841545SHajimu UMEMOTO 
239033841545SHajimu UMEMOTO 	free(pktopt, M_IP6OPT);
239133841545SHajimu UMEMOTO }
239233841545SHajimu UMEMOTO 
239333841545SHajimu UMEMOTO /*
239482cd038dSYoshinobu Inoue  * Set IPv6 outgoing packet options based on advanced API.
239582cd038dSYoshinobu Inoue  */
239682cd038dSYoshinobu Inoue int
23971272577eSXin LI ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
239879ba3952SBjoern A. Zeeb     struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
239982cd038dSYoshinobu Inoue {
240033841545SHajimu UMEMOTO 	struct cmsghdr *cm = 0;
240182cd038dSYoshinobu Inoue 
24028507acb1SHajimu UMEMOTO 	if (control == NULL || opt == NULL)
240382cd038dSYoshinobu Inoue 		return (EINVAL);
240482cd038dSYoshinobu Inoue 
2405885adbfaSHajimu UMEMOTO 	ip6_initpktopts(opt);
2406f95d4633SHajimu UMEMOTO 	if (stickyopt) {
2407885adbfaSHajimu UMEMOTO 		int error;
2408885adbfaSHajimu UMEMOTO 
2409f95d4633SHajimu UMEMOTO 		/*
2410f95d4633SHajimu UMEMOTO 		 * If stickyopt is provided, make a local copy of the options
2411f95d4633SHajimu UMEMOTO 		 * for this particular packet, then override them by ancillary
2412f95d4633SHajimu UMEMOTO 		 * objects.
2413885adbfaSHajimu UMEMOTO 		 * XXX: copypktopts() does not copy the cached route to a next
2414885adbfaSHajimu UMEMOTO 		 * hop (if any).  This is not very good in terms of efficiency,
2415885adbfaSHajimu UMEMOTO 		 * but we can allow this since this option should be rarely
2416885adbfaSHajimu UMEMOTO 		 * used.
2417f95d4633SHajimu UMEMOTO 		 */
2418885adbfaSHajimu UMEMOTO 		if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2419885adbfaSHajimu UMEMOTO 			return (error);
2420f95d4633SHajimu UMEMOTO 	}
242182cd038dSYoshinobu Inoue 
242282cd038dSYoshinobu Inoue 	/*
242382cd038dSYoshinobu Inoue 	 * XXX: Currently, we assume all the optional information is stored
242482cd038dSYoshinobu Inoue 	 * in a single mbuf.
242582cd038dSYoshinobu Inoue 	 */
242682cd038dSYoshinobu Inoue 	if (control->m_next)
242782cd038dSYoshinobu Inoue 		return (EINVAL);
242882cd038dSYoshinobu Inoue 
24296f4da201SBjoern A. Zeeb 	for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
243033841545SHajimu UMEMOTO 	    control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2431f95d4633SHajimu UMEMOTO 		int error;
2432f95d4633SHajimu UMEMOTO 
2433f95d4633SHajimu UMEMOTO 		if (control->m_len < CMSG_LEN(0))
2434f95d4633SHajimu UMEMOTO 			return (EINVAL);
2435f95d4633SHajimu UMEMOTO 
243682cd038dSYoshinobu Inoue 		cm = mtod(control, struct cmsghdr *);
243782cd038dSYoshinobu Inoue 		if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
243882cd038dSYoshinobu Inoue 			return (EINVAL);
243982cd038dSYoshinobu Inoue 		if (cm->cmsg_level != IPPROTO_IPV6)
244082cd038dSYoshinobu Inoue 			continue;
244182cd038dSYoshinobu Inoue 
2442d5e3406dSHajimu UMEMOTO 		error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
244379ba3952SBjoern A. Zeeb 		    cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2444f95d4633SHajimu UMEMOTO 		if (error)
2445f95d4633SHajimu UMEMOTO 			return (error);
2446f95d4633SHajimu UMEMOTO 	}
244782cd038dSYoshinobu Inoue 
2448f95d4633SHajimu UMEMOTO 	return (0);
2449f95d4633SHajimu UMEMOTO }
2450f95d4633SHajimu UMEMOTO 
2451f95d4633SHajimu UMEMOTO /*
2452f95d4633SHajimu UMEMOTO  * Set a particular packet option, as a sticky option or an ancillary data
2453f95d4633SHajimu UMEMOTO  * item.  "len" can be 0 only when it's a sticky option.
2454f95d4633SHajimu UMEMOTO  * We have 4 cases of combination of "sticky" and "cmsg":
2455f95d4633SHajimu UMEMOTO  * "sticky=0, cmsg=0": impossible
245618b35df8SHajimu UMEMOTO  * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
245718b35df8SHajimu UMEMOTO  * "sticky=1, cmsg=0": RFC3542 socket option
2458f95d4633SHajimu UMEMOTO  * "sticky=1, cmsg=1": RFC2292 socket option
2459f95d4633SHajimu UMEMOTO  */
2460f95d4633SHajimu UMEMOTO static int
24611272577eSXin LI ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
246279ba3952SBjoern A. Zeeb     struct ucred *cred, int sticky, int cmsg, int uproto)
2463f95d4633SHajimu UMEMOTO {
2464f95d4633SHajimu UMEMOTO 	int minmtupolicy, preftemp;
246579ba3952SBjoern A. Zeeb 	int error;
2466f95d4633SHajimu UMEMOTO 
2467f95d4633SHajimu UMEMOTO 	if (!sticky && !cmsg) {
2468f95d4633SHajimu UMEMOTO #ifdef DIAGNOSTIC
2469d5e3406dSHajimu UMEMOTO 		printf("ip6_setpktopt: impossible case\n");
2470f95d4633SHajimu UMEMOTO #endif
2471f95d4633SHajimu UMEMOTO 		return (EINVAL);
2472f95d4633SHajimu UMEMOTO 	}
2473f95d4633SHajimu UMEMOTO 
2474f95d4633SHajimu UMEMOTO 	/*
2475f95d4633SHajimu UMEMOTO 	 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
247618b35df8SHajimu UMEMOTO 	 * not be specified in the context of RFC3542.  Conversely,
247718b35df8SHajimu UMEMOTO 	 * RFC3542 types should not be specified in the context of RFC2292.
2478f95d4633SHajimu UMEMOTO 	 */
2479f95d4633SHajimu UMEMOTO 	if (!cmsg) {
2480f95d4633SHajimu UMEMOTO 		switch (optname) {
2481f95d4633SHajimu UMEMOTO 		case IPV6_2292PKTINFO:
2482f95d4633SHajimu UMEMOTO 		case IPV6_2292HOPLIMIT:
2483f95d4633SHajimu UMEMOTO 		case IPV6_2292NEXTHOP:
2484f95d4633SHajimu UMEMOTO 		case IPV6_2292HOPOPTS:
2485f95d4633SHajimu UMEMOTO 		case IPV6_2292DSTOPTS:
2486f95d4633SHajimu UMEMOTO 		case IPV6_2292RTHDR:
2487f95d4633SHajimu UMEMOTO 		case IPV6_2292PKTOPTIONS:
2488f95d4633SHajimu UMEMOTO 			return (ENOPROTOOPT);
2489f95d4633SHajimu UMEMOTO 		}
2490f95d4633SHajimu UMEMOTO 	}
2491f95d4633SHajimu UMEMOTO 	if (sticky && cmsg) {
2492f95d4633SHajimu UMEMOTO 		switch (optname) {
2493f95d4633SHajimu UMEMOTO 		case IPV6_PKTINFO:
2494f95d4633SHajimu UMEMOTO 		case IPV6_HOPLIMIT:
2495f95d4633SHajimu UMEMOTO 		case IPV6_NEXTHOP:
2496f95d4633SHajimu UMEMOTO 		case IPV6_HOPOPTS:
2497f95d4633SHajimu UMEMOTO 		case IPV6_DSTOPTS:
2498f95d4633SHajimu UMEMOTO 		case IPV6_RTHDRDSTOPTS:
2499f95d4633SHajimu UMEMOTO 		case IPV6_RTHDR:
2500f95d4633SHajimu UMEMOTO 		case IPV6_USE_MIN_MTU:
2501f95d4633SHajimu UMEMOTO 		case IPV6_DONTFRAG:
2502f95d4633SHajimu UMEMOTO 		case IPV6_TCLASS:
250318b35df8SHajimu UMEMOTO 		case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2504f95d4633SHajimu UMEMOTO 			return (ENOPROTOOPT);
2505f95d4633SHajimu UMEMOTO 		}
2506f95d4633SHajimu UMEMOTO 	}
2507f95d4633SHajimu UMEMOTO 
2508f95d4633SHajimu UMEMOTO 	switch (optname) {
2509f95d4633SHajimu UMEMOTO 	case IPV6_2292PKTINFO:
2510f95d4633SHajimu UMEMOTO 	case IPV6_PKTINFO:
2511f95d4633SHajimu UMEMOTO 	{
2512f95d4633SHajimu UMEMOTO 		struct ifnet *ifp = NULL;
2513f95d4633SHajimu UMEMOTO 		struct in6_pktinfo *pktinfo;
2514f95d4633SHajimu UMEMOTO 
2515f95d4633SHajimu UMEMOTO 		if (len != sizeof(struct in6_pktinfo))
2516f95d4633SHajimu UMEMOTO 			return (EINVAL);
2517f95d4633SHajimu UMEMOTO 
2518f95d4633SHajimu UMEMOTO 		pktinfo = (struct in6_pktinfo *)buf;
2519f95d4633SHajimu UMEMOTO 
2520f95d4633SHajimu UMEMOTO 		/*
2521f95d4633SHajimu UMEMOTO 		 * An application can clear any sticky IPV6_PKTINFO option by
2522f95d4633SHajimu UMEMOTO 		 * doing a "regular" setsockopt with ipi6_addr being
2523f95d4633SHajimu UMEMOTO 		 * in6addr_any and ipi6_ifindex being zero.
2524f95d4633SHajimu UMEMOTO 		 * [RFC 3542, Section 6]
2525f95d4633SHajimu UMEMOTO 		 */
2526f95d4633SHajimu UMEMOTO 		if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2527f95d4633SHajimu UMEMOTO 		    pktinfo->ipi6_ifindex == 0 &&
2528f95d4633SHajimu UMEMOTO 		    IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2529f95d4633SHajimu UMEMOTO 			ip6_clearpktopts(opt, optname);
2530f95d4633SHajimu UMEMOTO 			break;
2531f95d4633SHajimu UMEMOTO 		}
2532f95d4633SHajimu UMEMOTO 
2533f95d4633SHajimu UMEMOTO 		if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2534f95d4633SHajimu UMEMOTO 		    sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2535f95d4633SHajimu UMEMOTO 			return (EINVAL);
2536f95d4633SHajimu UMEMOTO 		}
2537f95d4633SHajimu UMEMOTO 
2538f95d4633SHajimu UMEMOTO 		/* validate the interface index if specified. */
2539603724d3SBjoern A. Zeeb 		if (pktinfo->ipi6_ifindex > V_if_index ||
2540f95d4633SHajimu UMEMOTO 		    pktinfo->ipi6_ifindex < 0) {
2541f95d4633SHajimu UMEMOTO 			 return (ENXIO);
2542f95d4633SHajimu UMEMOTO 		}
2543f95d4633SHajimu UMEMOTO 		if (pktinfo->ipi6_ifindex) {
2544f95d4633SHajimu UMEMOTO 			ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2545f95d4633SHajimu UMEMOTO 			if (ifp == NULL)
254682cd038dSYoshinobu Inoue 				return (ENXIO);
254782cd038dSYoshinobu Inoue 		}
254882cd038dSYoshinobu Inoue 
254933841545SHajimu UMEMOTO 		/*
2550f95d4633SHajimu UMEMOTO 		 * We store the address anyway, and let in6_selectsrc()
2551f95d4633SHajimu UMEMOTO 		 * validate the specified address.  This is because ipi6_addr
2552f95d4633SHajimu UMEMOTO 		 * may not have enough information about its scope zone, and
2553f95d4633SHajimu UMEMOTO 		 * we may need additional information (such as outgoing
2554f95d4633SHajimu UMEMOTO 		 * interface or the scope zone of a destination address) to
2555f95d4633SHajimu UMEMOTO 		 * disambiguate the scope.
2556f95d4633SHajimu UMEMOTO 		 * XXX: the delay of the validation may confuse the
2557f95d4633SHajimu UMEMOTO 		 * application when it is used as a sticky option.
255833841545SHajimu UMEMOTO 		 */
2559f95d4633SHajimu UMEMOTO 		if (opt->ip6po_pktinfo == NULL) {
2560f95d4633SHajimu UMEMOTO 			opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2561885adbfaSHajimu UMEMOTO 			    M_IP6OPT, M_NOWAIT);
2562885adbfaSHajimu UMEMOTO 			if (opt->ip6po_pktinfo == NULL)
2563885adbfaSHajimu UMEMOTO 				return (ENOBUFS);
256482cd038dSYoshinobu Inoue 		}
2565f95d4633SHajimu UMEMOTO 		bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
256682cd038dSYoshinobu Inoue 		break;
2567f95d4633SHajimu UMEMOTO 	}
256882cd038dSYoshinobu Inoue 
2569f95d4633SHajimu UMEMOTO 	case IPV6_2292HOPLIMIT:
257082cd038dSYoshinobu Inoue 	case IPV6_HOPLIMIT:
2571f95d4633SHajimu UMEMOTO 	{
2572f95d4633SHajimu UMEMOTO 		int *hlimp;
2573f95d4633SHajimu UMEMOTO 
2574f95d4633SHajimu UMEMOTO 		/*
2575f95d4633SHajimu UMEMOTO 		 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2576f95d4633SHajimu UMEMOTO 		 * to simplify the ordering among hoplimit options.
2577f95d4633SHajimu UMEMOTO 		 */
2578f95d4633SHajimu UMEMOTO 		if (optname == IPV6_HOPLIMIT && sticky)
2579f95d4633SHajimu UMEMOTO 			return (ENOPROTOOPT);
2580f95d4633SHajimu UMEMOTO 
2581f95d4633SHajimu UMEMOTO 		if (len != sizeof(int))
2582f95d4633SHajimu UMEMOTO 			return (EINVAL);
2583f95d4633SHajimu UMEMOTO 		hlimp = (int *)buf;
2584f95d4633SHajimu UMEMOTO 		if (*hlimp < -1 || *hlimp > 255)
258582cd038dSYoshinobu Inoue 			return (EINVAL);
258682cd038dSYoshinobu Inoue 
2587f95d4633SHajimu UMEMOTO 		opt->ip6po_hlim = *hlimp;
258882cd038dSYoshinobu Inoue 		break;
2589f95d4633SHajimu UMEMOTO 	}
259082cd038dSYoshinobu Inoue 
2591f95d4633SHajimu UMEMOTO 	case IPV6_TCLASS:
2592f95d4633SHajimu UMEMOTO 	{
2593f95d4633SHajimu UMEMOTO 		int tclass;
2594f95d4633SHajimu UMEMOTO 
2595f95d4633SHajimu UMEMOTO 		if (len != sizeof(int))
2596f95d4633SHajimu UMEMOTO 			return (EINVAL);
2597f95d4633SHajimu UMEMOTO 		tclass = *(int *)buf;
2598f95d4633SHajimu UMEMOTO 		if (tclass < -1 || tclass > 255)
2599f95d4633SHajimu UMEMOTO 			return (EINVAL);
2600f95d4633SHajimu UMEMOTO 
2601f95d4633SHajimu UMEMOTO 		opt->ip6po_tclass = tclass;
2602f95d4633SHajimu UMEMOTO 		break;
2603f95d4633SHajimu UMEMOTO 	}
2604f95d4633SHajimu UMEMOTO 
2605f95d4633SHajimu UMEMOTO 	case IPV6_2292NEXTHOP:
260682cd038dSYoshinobu Inoue 	case IPV6_NEXTHOP:
260779ba3952SBjoern A. Zeeb 		if (cred != NULL) {
260879ba3952SBjoern A. Zeeb 			error = priv_check_cred(cred,
260979ba3952SBjoern A. Zeeb 			    PRIV_NETINET_SETHDROPTS, 0);
261079ba3952SBjoern A. Zeeb 			if (error)
261179ba3952SBjoern A. Zeeb 				return (error);
261279ba3952SBjoern A. Zeeb 		}
261333841545SHajimu UMEMOTO 
2614f95d4633SHajimu UMEMOTO 		if (len == 0) {	/* just remove the option */
2615f95d4633SHajimu UMEMOTO 			ip6_clearpktopts(opt, IPV6_NEXTHOP);
2616f95d4633SHajimu UMEMOTO 			break;
2617f95d4633SHajimu UMEMOTO 		}
2618f95d4633SHajimu UMEMOTO 
261933841545SHajimu UMEMOTO 		/* check if cmsg_len is large enough for sa_len */
2620f95d4633SHajimu UMEMOTO 		if (len < sizeof(struct sockaddr) || len < *buf)
262182cd038dSYoshinobu Inoue 			return (EINVAL);
262282cd038dSYoshinobu Inoue 
2623f95d4633SHajimu UMEMOTO 		switch (((struct sockaddr *)buf)->sa_family) {
2624f95d4633SHajimu UMEMOTO 		case AF_INET6:
2625f95d4633SHajimu UMEMOTO 		{
2626f95d4633SHajimu UMEMOTO 			struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
2627f95d4633SHajimu UMEMOTO 			int error;
2628f95d4633SHajimu UMEMOTO 
2629f95d4633SHajimu UMEMOTO 			if (sa6->sin6_len != sizeof(struct sockaddr_in6))
2630f95d4633SHajimu UMEMOTO 				return (EINVAL);
2631f95d4633SHajimu UMEMOTO 
2632f95d4633SHajimu UMEMOTO 			if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
2633f95d4633SHajimu UMEMOTO 			    IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
2634f95d4633SHajimu UMEMOTO 				return (EINVAL);
2635f95d4633SHajimu UMEMOTO 			}
2636603724d3SBjoern A. Zeeb 			if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
2637f95d4633SHajimu UMEMOTO 			    != 0) {
2638f95d4633SHajimu UMEMOTO 				return (error);
2639f95d4633SHajimu UMEMOTO 			}
2640f95d4633SHajimu UMEMOTO 			break;
2641f95d4633SHajimu UMEMOTO 		}
2642f95d4633SHajimu UMEMOTO 		case AF_LINK:	/* should eventually be supported */
2643f95d4633SHajimu UMEMOTO 		default:
2644f95d4633SHajimu UMEMOTO 			return (EAFNOSUPPORT);
2645f95d4633SHajimu UMEMOTO 		}
2646f95d4633SHajimu UMEMOTO 
2647f95d4633SHajimu UMEMOTO 		/* turn off the previous option, then set the new option. */
2648f95d4633SHajimu UMEMOTO 		ip6_clearpktopts(opt, IPV6_NEXTHOP);
2649743eee66SSUZUKI Shinsuke 		opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
2650743eee66SSUZUKI Shinsuke 		if (opt->ip6po_nexthop == NULL)
2651743eee66SSUZUKI Shinsuke 			return (ENOBUFS);
2652f95d4633SHajimu UMEMOTO 		bcopy(buf, opt->ip6po_nexthop, *buf);
265382cd038dSYoshinobu Inoue 		break;
265482cd038dSYoshinobu Inoue 
2655f95d4633SHajimu UMEMOTO 	case IPV6_2292HOPOPTS:
265682cd038dSYoshinobu Inoue 	case IPV6_HOPOPTS:
265733841545SHajimu UMEMOTO 	{
265833841545SHajimu UMEMOTO 		struct ip6_hbh *hbh;
265933841545SHajimu UMEMOTO 		int hbhlen;
266033841545SHajimu UMEMOTO 
2661f95d4633SHajimu UMEMOTO 		/*
2662f95d4633SHajimu UMEMOTO 		 * XXX: We don't allow a non-privileged user to set ANY HbH
2663f95d4633SHajimu UMEMOTO 		 * options, since per-option restriction has too much
2664f95d4633SHajimu UMEMOTO 		 * overhead.
2665f95d4633SHajimu UMEMOTO 		 */
266679ba3952SBjoern A. Zeeb 		if (cred != NULL) {
266779ba3952SBjoern A. Zeeb 			error = priv_check_cred(cred,
266879ba3952SBjoern A. Zeeb 			    PRIV_NETINET_SETHDROPTS, 0);
266979ba3952SBjoern A. Zeeb 			if (error)
267079ba3952SBjoern A. Zeeb 				return (error);
267179ba3952SBjoern A. Zeeb 		}
2672f95d4633SHajimu UMEMOTO 
2673f95d4633SHajimu UMEMOTO 		if (len == 0) {
2674f95d4633SHajimu UMEMOTO 			ip6_clearpktopts(opt, IPV6_HOPOPTS);
2675f95d4633SHajimu UMEMOTO 			break;	/* just remove the option */
2676f95d4633SHajimu UMEMOTO 		}
2677f95d4633SHajimu UMEMOTO 
2678f95d4633SHajimu UMEMOTO 		/* message length validation */
2679f95d4633SHajimu UMEMOTO 		if (len < sizeof(struct ip6_hbh))
268082cd038dSYoshinobu Inoue 			return (EINVAL);
2681f95d4633SHajimu UMEMOTO 		hbh = (struct ip6_hbh *)buf;
268233841545SHajimu UMEMOTO 		hbhlen = (hbh->ip6h_len + 1) << 3;
2683f95d4633SHajimu UMEMOTO 		if (len != hbhlen)
268482cd038dSYoshinobu Inoue 			return (EINVAL);
268533841545SHajimu UMEMOTO 
2686f95d4633SHajimu UMEMOTO 		/* turn off the previous option, then set the new option. */
2687f95d4633SHajimu UMEMOTO 		ip6_clearpktopts(opt, IPV6_HOPOPTS);
2688743eee66SSUZUKI Shinsuke 		opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
2689743eee66SSUZUKI Shinsuke 		if (opt->ip6po_hbh == NULL)
2690743eee66SSUZUKI Shinsuke 			return (ENOBUFS);
269133841545SHajimu UMEMOTO 		bcopy(hbh, opt->ip6po_hbh, hbhlen);
2692f95d4633SHajimu UMEMOTO 
269382cd038dSYoshinobu Inoue 		break;
269433841545SHajimu UMEMOTO 	}
269582cd038dSYoshinobu Inoue 
2696f95d4633SHajimu UMEMOTO 	case IPV6_2292DSTOPTS:
269782cd038dSYoshinobu Inoue 	case IPV6_DSTOPTS:
2698f95d4633SHajimu UMEMOTO 	case IPV6_RTHDRDSTOPTS:
269933841545SHajimu UMEMOTO 	{
2700f95d4633SHajimu UMEMOTO 		struct ip6_dest *dest, **newdest = NULL;
270133841545SHajimu UMEMOTO 		int destlen;
270233841545SHajimu UMEMOTO 
270379ba3952SBjoern A. Zeeb 		if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
270479ba3952SBjoern A. Zeeb 			error = priv_check_cred(cred,
270579ba3952SBjoern A. Zeeb 			    PRIV_NETINET_SETHDROPTS, 0);
270679ba3952SBjoern A. Zeeb 			if (error)
270779ba3952SBjoern A. Zeeb 				return (error);
270879ba3952SBjoern A. Zeeb 		}
2709f95d4633SHajimu UMEMOTO 
2710f95d4633SHajimu UMEMOTO 		if (len == 0) {
2711f95d4633SHajimu UMEMOTO 			ip6_clearpktopts(opt, optname);
2712f95d4633SHajimu UMEMOTO 			break;	/* just remove the option */
2713f95d4633SHajimu UMEMOTO 		}
2714f95d4633SHajimu UMEMOTO 
2715f95d4633SHajimu UMEMOTO 		/* message length validation */
2716f95d4633SHajimu UMEMOTO 		if (len < sizeof(struct ip6_dest))
271782cd038dSYoshinobu Inoue 			return (EINVAL);
2718f95d4633SHajimu UMEMOTO 		dest = (struct ip6_dest *)buf;
271933841545SHajimu UMEMOTO 		destlen = (dest->ip6d_len + 1) << 3;
2720f95d4633SHajimu UMEMOTO 		if (len != destlen)
272133841545SHajimu UMEMOTO 			return (EINVAL);
272282cd038dSYoshinobu Inoue 
272382cd038dSYoshinobu Inoue 		/*
2724f95d4633SHajimu UMEMOTO 		 * Determine the position that the destination options header
2725f95d4633SHajimu UMEMOTO 		 * should be inserted; before or after the routing header.
2726f95d4633SHajimu UMEMOTO 		 */
2727f95d4633SHajimu UMEMOTO 		switch (optname) {
2728f95d4633SHajimu UMEMOTO 		case IPV6_2292DSTOPTS:
2729f95d4633SHajimu UMEMOTO 			/*
2730f95d4633SHajimu UMEMOTO 			 * The old advacned API is ambiguous on this point.
2731f95d4633SHajimu UMEMOTO 			 * Our approach is to determine the position based
2732f95d4633SHajimu UMEMOTO 			 * according to the existence of a routing header.
2733f95d4633SHajimu UMEMOTO 			 * Note, however, that this depends on the order of the
2734f95d4633SHajimu UMEMOTO 			 * extension headers in the ancillary data; the 1st
2735f95d4633SHajimu UMEMOTO 			 * part of the destination options header must appear
2736f95d4633SHajimu UMEMOTO 			 * before the routing header in the ancillary data,
2737f95d4633SHajimu UMEMOTO 			 * too.
273818b35df8SHajimu UMEMOTO 			 * RFC3542 solved the ambiguity by introducing
2739f95d4633SHajimu UMEMOTO 			 * separate ancillary data or option types.
274082cd038dSYoshinobu Inoue 			 */
274133841545SHajimu UMEMOTO 			if (opt->ip6po_rthdr == NULL)
274233841545SHajimu UMEMOTO 				newdest = &opt->ip6po_dest1;
274333841545SHajimu UMEMOTO 			else
274433841545SHajimu UMEMOTO 				newdest = &opt->ip6po_dest2;
2745f95d4633SHajimu UMEMOTO 			break;
2746f95d4633SHajimu UMEMOTO 		case IPV6_RTHDRDSTOPTS:
2747f95d4633SHajimu UMEMOTO 			newdest = &opt->ip6po_dest1;
2748f95d4633SHajimu UMEMOTO 			break;
2749f95d4633SHajimu UMEMOTO 		case IPV6_DSTOPTS:
2750f95d4633SHajimu UMEMOTO 			newdest = &opt->ip6po_dest2;
2751f95d4633SHajimu UMEMOTO 			break;
2752f95d4633SHajimu UMEMOTO 		}
275333841545SHajimu UMEMOTO 
2754f95d4633SHajimu UMEMOTO 		/* turn off the previous option, then set the new option. */
2755f95d4633SHajimu UMEMOTO 		ip6_clearpktopts(opt, optname);
2756743eee66SSUZUKI Shinsuke 		*newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
2757fc4c8258SRobert Watson 		if (*newdest == NULL)
2758743eee66SSUZUKI Shinsuke 			return (ENOBUFS);
275933841545SHajimu UMEMOTO 		bcopy(dest, *newdest, destlen);
276033841545SHajimu UMEMOTO 
276182cd038dSYoshinobu Inoue 		break;
276233841545SHajimu UMEMOTO 	}
276382cd038dSYoshinobu Inoue 
2764f95d4633SHajimu UMEMOTO 	case IPV6_2292RTHDR:
276582cd038dSYoshinobu Inoue 	case IPV6_RTHDR:
276633841545SHajimu UMEMOTO 	{
276733841545SHajimu UMEMOTO 		struct ip6_rthdr *rth;
276833841545SHajimu UMEMOTO 		int rthlen;
276933841545SHajimu UMEMOTO 
2770f95d4633SHajimu UMEMOTO 		if (len == 0) {
2771f95d4633SHajimu UMEMOTO 			ip6_clearpktopts(opt, IPV6_RTHDR);
2772f95d4633SHajimu UMEMOTO 			break;	/* just remove the option */
2773f95d4633SHajimu UMEMOTO 		}
2774f95d4633SHajimu UMEMOTO 
2775f95d4633SHajimu UMEMOTO 		/* message length validation */
2776f95d4633SHajimu UMEMOTO 		if (len < sizeof(struct ip6_rthdr))
277782cd038dSYoshinobu Inoue 			return (EINVAL);
2778f95d4633SHajimu UMEMOTO 		rth = (struct ip6_rthdr *)buf;
277933841545SHajimu UMEMOTO 		rthlen = (rth->ip6r_len + 1) << 3;
2780f95d4633SHajimu UMEMOTO 		if (len != rthlen)
278182cd038dSYoshinobu Inoue 			return (EINVAL);
278233841545SHajimu UMEMOTO 
278333841545SHajimu UMEMOTO 		switch (rth->ip6r_type) {
278482cd038dSYoshinobu Inoue 		case IPV6_RTHDR_TYPE_0:
2785f95d4633SHajimu UMEMOTO 			if (rth->ip6r_len == 0)	/* must contain one addr */
278633841545SHajimu UMEMOTO 				return (EINVAL);
2787f95d4633SHajimu UMEMOTO 			if (rth->ip6r_len % 2) /* length must be even */
278833841545SHajimu UMEMOTO 				return (EINVAL);
278933841545SHajimu UMEMOTO 			if (rth->ip6r_len / 2 != rth->ip6r_segleft)
279082cd038dSYoshinobu Inoue 				return (EINVAL);
279182cd038dSYoshinobu Inoue 			break;
279282cd038dSYoshinobu Inoue 		default:
279333841545SHajimu UMEMOTO 			return (EINVAL);	/* not supported */
279482cd038dSYoshinobu Inoue 		}
279533841545SHajimu UMEMOTO 
2796f95d4633SHajimu UMEMOTO 		/* turn off the previous option */
2797f95d4633SHajimu UMEMOTO 		ip6_clearpktopts(opt, IPV6_RTHDR);
2798743eee66SSUZUKI Shinsuke 		opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
2799743eee66SSUZUKI Shinsuke 		if (opt->ip6po_rthdr == NULL)
2800743eee66SSUZUKI Shinsuke 			return (ENOBUFS);
280133841545SHajimu UMEMOTO 		bcopy(rth, opt->ip6po_rthdr, rthlen);
280233841545SHajimu UMEMOTO 
280382cd038dSYoshinobu Inoue 		break;
280433841545SHajimu UMEMOTO 	}
280582cd038dSYoshinobu Inoue 
2806f95d4633SHajimu UMEMOTO 	case IPV6_USE_MIN_MTU:
2807f95d4633SHajimu UMEMOTO 		if (len != sizeof(int))
2808f95d4633SHajimu UMEMOTO 			return (EINVAL);
2809f95d4633SHajimu UMEMOTO 		minmtupolicy = *(int *)buf;
2810f95d4633SHajimu UMEMOTO 		if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
2811f95d4633SHajimu UMEMOTO 		    minmtupolicy != IP6PO_MINMTU_DISABLE &&
2812f95d4633SHajimu UMEMOTO 		    minmtupolicy != IP6PO_MINMTU_ALL) {
2813f95d4633SHajimu UMEMOTO 			return (EINVAL);
2814f95d4633SHajimu UMEMOTO 		}
2815f95d4633SHajimu UMEMOTO 		opt->ip6po_minmtu = minmtupolicy;
2816f95d4633SHajimu UMEMOTO 		break;
2817f95d4633SHajimu UMEMOTO 
2818f95d4633SHajimu UMEMOTO 	case IPV6_DONTFRAG:
2819f95d4633SHajimu UMEMOTO 		if (len != sizeof(int))
2820f95d4633SHajimu UMEMOTO 			return (EINVAL);
2821f95d4633SHajimu UMEMOTO 
2822f95d4633SHajimu UMEMOTO 		if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
2823f95d4633SHajimu UMEMOTO 			/*
2824f95d4633SHajimu UMEMOTO 			 * we ignore this option for TCP sockets.
282518b35df8SHajimu UMEMOTO 			 * (RFC3542 leaves this case unspecified.)
2826f95d4633SHajimu UMEMOTO 			 */
2827f95d4633SHajimu UMEMOTO 			opt->ip6po_flags &= ~IP6PO_DONTFRAG;
2828f95d4633SHajimu UMEMOTO 		} else
2829f95d4633SHajimu UMEMOTO 			opt->ip6po_flags |= IP6PO_DONTFRAG;
2830f95d4633SHajimu UMEMOTO 		break;
2831f95d4633SHajimu UMEMOTO 
2832f95d4633SHajimu UMEMOTO 	case IPV6_PREFER_TEMPADDR:
2833f95d4633SHajimu UMEMOTO 		if (len != sizeof(int))
2834f95d4633SHajimu UMEMOTO 			return (EINVAL);
2835f95d4633SHajimu UMEMOTO 		preftemp = *(int *)buf;
2836f95d4633SHajimu UMEMOTO 		if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
2837f95d4633SHajimu UMEMOTO 		    preftemp != IP6PO_TEMPADDR_NOTPREFER &&
2838f95d4633SHajimu UMEMOTO 		    preftemp != IP6PO_TEMPADDR_PREFER) {
2839f95d4633SHajimu UMEMOTO 			return (EINVAL);
2840f95d4633SHajimu UMEMOTO 		}
2841f95d4633SHajimu UMEMOTO 		opt->ip6po_prefer_tempaddr = preftemp;
2842f95d4633SHajimu UMEMOTO 		break;
2843f95d4633SHajimu UMEMOTO 
284482cd038dSYoshinobu Inoue 	default:
284582cd038dSYoshinobu Inoue 		return (ENOPROTOOPT);
2846f95d4633SHajimu UMEMOTO 	} /* end of switch */
284782cd038dSYoshinobu Inoue 
284882cd038dSYoshinobu Inoue 	return (0);
284982cd038dSYoshinobu Inoue }
285082cd038dSYoshinobu Inoue 
285182cd038dSYoshinobu Inoue /*
285282cd038dSYoshinobu Inoue  * Routine called from ip6_output() to loop back a copy of an IP6 multicast
285382cd038dSYoshinobu Inoue  * packet to the input queue of a specified interface.  Note that this
285482cd038dSYoshinobu Inoue  * calls the output routine of the loopback "driver", but with an interface
285582cd038dSYoshinobu Inoue  * pointer that might NOT be &loif -- easier than replicating that code here.
285682cd038dSYoshinobu Inoue  */
285782cd038dSYoshinobu Inoue void
28581272577eSXin LI ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst)
285982cd038dSYoshinobu Inoue {
286082cd038dSYoshinobu Inoue 	struct mbuf *copym;
2861686cdd19SJun-ichiro itojun Hagino 	struct ip6_hdr *ip6;
286282cd038dSYoshinobu Inoue 
286382cd038dSYoshinobu Inoue 	copym = m_copy(m, 0, M_COPYALL);
2864686cdd19SJun-ichiro itojun Hagino 	if (copym == NULL)
2865686cdd19SJun-ichiro itojun Hagino 		return;
2866686cdd19SJun-ichiro itojun Hagino 
2867686cdd19SJun-ichiro itojun Hagino 	/*
2868686cdd19SJun-ichiro itojun Hagino 	 * Make sure to deep-copy IPv6 header portion in case the data
2869686cdd19SJun-ichiro itojun Hagino 	 * is in an mbuf cluster, so that we can safely override the IPv6
2870686cdd19SJun-ichiro itojun Hagino 	 * header portion later.
2871686cdd19SJun-ichiro itojun Hagino 	 */
2872686cdd19SJun-ichiro itojun Hagino 	if ((copym->m_flags & M_EXT) != 0 ||
2873686cdd19SJun-ichiro itojun Hagino 	    copym->m_len < sizeof(struct ip6_hdr)) {
2874686cdd19SJun-ichiro itojun Hagino 		copym = m_pullup(copym, sizeof(struct ip6_hdr));
2875686cdd19SJun-ichiro itojun Hagino 		if (copym == NULL)
2876686cdd19SJun-ichiro itojun Hagino 			return;
287782cd038dSYoshinobu Inoue 	}
2878686cdd19SJun-ichiro itojun Hagino 
2879686cdd19SJun-ichiro itojun Hagino #ifdef DIAGNOSTIC
2880686cdd19SJun-ichiro itojun Hagino 	if (copym->m_len < sizeof(*ip6)) {
2881686cdd19SJun-ichiro itojun Hagino 		m_freem(copym);
2882686cdd19SJun-ichiro itojun Hagino 		return;
2883686cdd19SJun-ichiro itojun Hagino 	}
2884686cdd19SJun-ichiro itojun Hagino #endif
2885686cdd19SJun-ichiro itojun Hagino 
2886686cdd19SJun-ichiro itojun Hagino 	ip6 = mtod(copym, struct ip6_hdr *);
288733841545SHajimu UMEMOTO 	/*
288833841545SHajimu UMEMOTO 	 * clear embedded scope identifiers if necessary.
288933841545SHajimu UMEMOTO 	 * in6_clearscope will touch the addresses only when necessary.
289033841545SHajimu UMEMOTO 	 */
289133841545SHajimu UMEMOTO 	in6_clearscope(&ip6->ip6_src);
289233841545SHajimu UMEMOTO 	in6_clearscope(&ip6->ip6_dst);
2893686cdd19SJun-ichiro itojun Hagino 
2894a89ec05eSPeter Wemm 	(void)if_simloop(ifp, copym, dst->sin6_family, 0);
289582cd038dSYoshinobu Inoue }
289682cd038dSYoshinobu Inoue 
289782cd038dSYoshinobu Inoue /*
289882cd038dSYoshinobu Inoue  * Chop IPv6 header off from the payload.
289982cd038dSYoshinobu Inoue  */
290082cd038dSYoshinobu Inoue static int
29011272577eSXin LI ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
290282cd038dSYoshinobu Inoue {
290382cd038dSYoshinobu Inoue 	struct mbuf *mh;
290482cd038dSYoshinobu Inoue 	struct ip6_hdr *ip6;
290582cd038dSYoshinobu Inoue 
290682cd038dSYoshinobu Inoue 	ip6 = mtod(m, struct ip6_hdr *);
290782cd038dSYoshinobu Inoue 	if (m->m_len > sizeof(*ip6)) {
2908a163d034SWarner Losh 		MGETHDR(mh, M_DONTWAIT, MT_HEADER);
290982cd038dSYoshinobu Inoue 		if (mh == 0) {
291082cd038dSYoshinobu Inoue 			m_freem(m);
291182cd038dSYoshinobu Inoue 			return ENOBUFS;
291282cd038dSYoshinobu Inoue 		}
29139967cafcSSam Leffler 		M_MOVE_PKTHDR(mh, m);
291482cd038dSYoshinobu Inoue 		MH_ALIGN(mh, sizeof(*ip6));
291582cd038dSYoshinobu Inoue 		m->m_len -= sizeof(*ip6);
291682cd038dSYoshinobu Inoue 		m->m_data += sizeof(*ip6);
291782cd038dSYoshinobu Inoue 		mh->m_next = m;
291882cd038dSYoshinobu Inoue 		m = mh;
291982cd038dSYoshinobu Inoue 		m->m_len = sizeof(*ip6);
292082cd038dSYoshinobu Inoue 		bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
292182cd038dSYoshinobu Inoue 	}
292282cd038dSYoshinobu Inoue 	exthdrs->ip6e_ip6 = m;
292382cd038dSYoshinobu Inoue 	return 0;
292482cd038dSYoshinobu Inoue }
292582cd038dSYoshinobu Inoue 
292682cd038dSYoshinobu Inoue /*
292782cd038dSYoshinobu Inoue  * Compute IPv6 extension header length.
292882cd038dSYoshinobu Inoue  */
292982cd038dSYoshinobu Inoue int
2930fc384fa5SBjoern A. Zeeb ip6_optlen(struct inpcb *in6p)
293182cd038dSYoshinobu Inoue {
293282cd038dSYoshinobu Inoue 	int len;
293382cd038dSYoshinobu Inoue 
293482cd038dSYoshinobu Inoue 	if (!in6p->in6p_outputopts)
293582cd038dSYoshinobu Inoue 		return 0;
293682cd038dSYoshinobu Inoue 
293782cd038dSYoshinobu Inoue 	len = 0;
293882cd038dSYoshinobu Inoue #define elen(x) \
293982cd038dSYoshinobu Inoue     (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
294082cd038dSYoshinobu Inoue 
294182cd038dSYoshinobu Inoue 	len += elen(in6p->in6p_outputopts->ip6po_hbh);
294233841545SHajimu UMEMOTO 	if (in6p->in6p_outputopts->ip6po_rthdr)
294333841545SHajimu UMEMOTO 		/* dest1 is valid with rthdr only */
294482cd038dSYoshinobu Inoue 		len += elen(in6p->in6p_outputopts->ip6po_dest1);
294582cd038dSYoshinobu Inoue 	len += elen(in6p->in6p_outputopts->ip6po_rthdr);
294682cd038dSYoshinobu Inoue 	len += elen(in6p->in6p_outputopts->ip6po_dest2);
294782cd038dSYoshinobu Inoue 	return len;
294882cd038dSYoshinobu Inoue #undef elen
294982cd038dSYoshinobu Inoue }
2950