2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $
33 * Copyright (c) 1982, 1986, 1988, 1990, 1993
34 * The Regents of the University of California. All rights reserved.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD$");
67 #include "opt_inet6.h"
69 #include "opt_ipsec.h"
71 #include "opt_route.h"
73 #include <sys/param.h>
74 #include <sys/kernel.h>
75 #include <sys/malloc.h>
77 #include <sys/errno.h>
80 #include <sys/protosw.h>
81 #include <sys/socket.h>
82 #include <sys/socketvar.h>
83 #include <sys/syslog.h>
84 #include <sys/ucred.h>
86 #include <machine/in_cksum.h>
89 #include <net/netisr.h>
90 #include <net/route.h>
94 #include <netinet/in.h>
95 #include <netinet/in_var.h>
96 #include <netinet/ip_var.h>
97 #include <netinet6/in6_var.h>
98 #include <netinet/ip6.h>
99 #include <netinet/icmp6.h>
100 #include <netinet6/ip6_var.h>
101 #include <netinet/in_pcb.h>
102 #include <netinet/tcp_var.h>
103 #include <netinet6/nd6.h>
106 #include <netipsec/ipsec.h>
107 #include <netipsec/ipsec6.h>
108 #include <netipsec/key.h>
109 #include <netinet6/ip6_ipsec.h>
112 #include <netinet/sctp.h>
113 #include <netinet/sctp_crc32.h>
116 #include <netinet6/ip6protosw.h>
117 #include <netinet6/scope6_var.h>
120 #include <net/flowtable.h>
123 extern int in6_mcast_loop;
126 struct mbuf *ip6e_ip6;
127 struct mbuf *ip6e_hbh;
128 struct mbuf *ip6e_dest1;
129 struct mbuf *ip6e_rthdr;
130 struct mbuf *ip6e_dest2;
133 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **,
134 struct ucred *, int);
135 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *,
136 struct socket *, struct sockopt *);
137 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *);
138 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *,
139 struct ucred *, int, int, int);
141 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
142 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
144 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
145 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
146 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *,
147 struct ifnet *, struct in6_addr *, u_long *, int *, u_int);
148 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
152 * Make an extension header from option data. hp is the source, and
153 * mp is the destination.
155 #define MAKE_EXTHDR(hp, mp) \
158 struct ip6_ext *eh = (struct ip6_ext *)(hp); \
159 error = ip6_copyexthdr((mp), (caddr_t)(hp), \
160 ((eh)->ip6e_len + 1) << 3); \
164 } while (/*CONSTCOND*/ 0)
167 * Form a chain of extension headers.
168 * m is the extension header mbuf
169 * mp is the previous mbuf in the chain
170 * p is the next header
171 * i is the type of option.
173 #define MAKE_CHAIN(m, mp, p, i)\
177 panic("assumption failed: hdr not split"); \
178 *mtod((m), u_char *) = *(p);\
180 p = mtod((m), u_char *);\
181 (m)->m_next = (mp)->m_next;\
185 } while (/*CONSTCOND*/ 0)
188 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
192 csum = in_cksum_skip(m, offset + plen, offset);
193 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
195 offset += m->m_pkthdr.csum_data; /* checksum offset */
197 if (offset + sizeof(u_short) > m->m_len) {
198 printf("%s: delayed m_pullup, m->len: %d plen %u off %u "
199 "csum_flags=%b\n", __func__, m->m_len, plen, offset,
200 (int)m->m_pkthdr.csum_flags, CSUM_BITS);
202 * XXX this should not happen, but if it does, the correct
203 * behavior may be to insert the checksum in the appropriate
204 * next mbuf in the chain.
208 *(u_short *)(m->m_data + offset) = csum;
212 * IP6 output. The packet in mbuf chain m contains a skeletal IP6
213 * header (with pri, len, nxt, hlim, src, dst).
214 * This function may modify ver and hlim only.
215 * The mbuf chain containing the packet will be freed.
216 * The mbuf opt, if present, will not be freed.
217 * If route_in6 ro is present and has ro_rt initialized, route lookup would be
218 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
219 * then result of route lookup is stored in ro->ro_rt.
221 * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and
222 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one,
225 * ifpp - XXX: just for statistics
228 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
229 struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
230 struct ifnet **ifpp, struct inpcb *inp)
232 struct ip6_hdr *ip6, *mhip6;
233 struct ifnet *ifp, *origifp;
235 struct mbuf *mprev = NULL;
236 int hlen, tlen, len, off;
237 struct route_in6 ip6route;
238 struct rtentry *rt = NULL;
239 struct sockaddr_in6 *dst, src_sa, dst_sa;
240 struct in6_addr odst;
242 struct in6_ifaddr *ia = NULL;
244 int alwaysfrag, dontfrag;
245 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
246 struct ip6_exthdrs exthdrs;
247 struct in6_addr finaldst, src0, dst0;
249 struct route_in6 *ro_pmtu = NULL;
254 struct ipsec_output_state state;
255 struct ip6_rthdr *rh = NULL;
256 int needipsectun = 0;
258 struct secpolicy *sp = NULL;
260 struct m_tag *fwd_tag = NULL;
262 ip6 = mtod(m, struct ip6_hdr *);
264 printf ("ip6 is NULL");
269 M_SETFIB(m, inp->inp_inc.inc_fibnum);
271 finaldst = ip6->ip6_dst;
272 bzero(&exthdrs, sizeof(exthdrs));
274 /* Hop-by-Hop options header */
275 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
276 /* Destination options header(1st part) */
277 if (opt->ip6po_rthdr) {
279 * Destination options header(1st part)
280 * This only makes sense with a routing header.
281 * See Section 9.2 of RFC 3542.
282 * Disabling this part just for MIP6 convenience is
283 * a bad idea. We need to think carefully about a
284 * way to make the advanced API coexist with MIP6
285 * options, which might automatically be inserted in
288 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
291 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
292 /* Destination options header(2nd part) */
293 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
298 * IPSec checking which handles several cases.
299 * FAST IPSEC: We re-injected the packet.
301 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp, &sp))
303 case 1: /* Bad packet */
305 case -1: /* Do IPSec */
308 * Do delayed checksums now, as we may send before returning.
310 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
311 plen = m->m_pkthdr.len - sizeof(*ip6);
312 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
313 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
316 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
317 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
318 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
321 case 0: /* No IPSec */
328 * Calculate the total length of the extension header chain.
329 * Keep the length of the unfragmentable part for fragmentation.
332 if (exthdrs.ip6e_hbh)
333 optlen += exthdrs.ip6e_hbh->m_len;
334 if (exthdrs.ip6e_dest1)
335 optlen += exthdrs.ip6e_dest1->m_len;
336 if (exthdrs.ip6e_rthdr)
337 optlen += exthdrs.ip6e_rthdr->m_len;
338 unfragpartlen = optlen + sizeof(struct ip6_hdr);
340 /* NOTE: we don't add AH/ESP length here. do that later. */
341 if (exthdrs.ip6e_dest2)
342 optlen += exthdrs.ip6e_dest2->m_len;
345 * If we need IPsec, or there is at least one extension header,
346 * separate IP6 header from the payload.
348 if ((needipsec || optlen) && !hdrsplit) {
349 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
353 m = exthdrs.ip6e_ip6;
358 ip6 = mtod(m, struct ip6_hdr *);
360 /* adjust mbuf packet header length */
361 m->m_pkthdr.len += optlen;
362 plen = m->m_pkthdr.len - sizeof(*ip6);
364 /* If this is a jumbo payload, insert a jumbo payload option. */
365 if (plen > IPV6_MAXPACKET) {
367 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
371 m = exthdrs.ip6e_ip6;
375 ip6 = mtod(m, struct ip6_hdr *);
376 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
380 ip6->ip6_plen = htons(plen);
383 * Concatenate headers and fill in next header fields.
384 * Here we have, on "m"
386 * and we insert headers accordingly. Finally, we should be getting:
387 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
389 * during the header composing process, "m" points to IPv6 header.
390 * "mprev" points to an extension header prior to esp.
392 u_char *nexthdrp = &ip6->ip6_nxt;
396 * we treat dest2 specially. this makes IPsec processing
397 * much easier. the goal here is to make mprev point the
398 * mbuf prior to dest2.
400 * result: IPv6 dest2 payload
401 * m and mprev will point to IPv6 header.
403 if (exthdrs.ip6e_dest2) {
405 panic("assumption failed: hdr not split");
406 exthdrs.ip6e_dest2->m_next = m->m_next;
407 m->m_next = exthdrs.ip6e_dest2;
408 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
409 ip6->ip6_nxt = IPPROTO_DSTOPTS;
413 * result: IPv6 hbh dest1 rthdr dest2 payload
414 * m will point to IPv6 header. mprev will point to the
415 * extension header prior to dest2 (rthdr in the above case).
417 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
418 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
420 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
428 * pointers after IPsec headers are not valid any more.
429 * other pointers need a great care too.
430 * (IPsec routines should not mangle mbufs prior to AH/ESP)
432 exthdrs.ip6e_dest2 = NULL;
434 if (exthdrs.ip6e_rthdr) {
435 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *);
436 segleft_org = rh->ip6r_segleft;
437 rh->ip6r_segleft = 0;
440 bzero(&state, sizeof(state));
442 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags,
445 if (error == EJUSTRETURN) {
447 * We had a SP with a level of 'use' and no SA. We
448 * will just continue to process the packet without
453 /* mbuf is already reclaimed in ipsec6_output_trans. */
463 printf("[%s:%d] (ipsec): error code %d\n",
464 __func__, __LINE__, error);
467 /* don't show these error codes to the user */
472 } else if (!needipsectun) {
474 * In the FAST IPSec case we have already
475 * re-injected the packet and it has been freed
476 * by the ipsec_done() function. So, just clean
477 * up after ourselves.
482 if (exthdrs.ip6e_rthdr) {
483 /* ah6_output doesn't modify mbuf chain */
484 rh->ip6r_segleft = segleft_org;
490 * If there is a routing header, discard the packet.
492 if (exthdrs.ip6e_rthdr) {
497 /* Source address validation */
498 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
499 (flags & IPV6_UNSPECSRC) == 0) {
501 IP6STAT_INC(ip6s_badscope);
504 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
506 IP6STAT_INC(ip6s_badscope);
510 IP6STAT_INC(ip6s_localout);
517 bzero((caddr_t)ro, sizeof(*ro));
520 if (opt && opt->ip6po_rthdr)
521 ro = &opt->ip6po_route;
522 dst = (struct sockaddr_in6 *)&ro->ro_dst;
524 if (ro->ro_rt == NULL)
525 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro);
529 * if specified, try to fill in the traffic class field.
530 * do not override if a non-zero value is already set.
531 * we check the diffserv field and the ecn field separately.
533 if (opt && opt->ip6po_tclass >= 0) {
536 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
538 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
541 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
544 /* fill in or override the hop limit field, if necessary. */
545 if (opt && opt->ip6po_hlim != -1)
546 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
547 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
549 ip6->ip6_hlim = im6o->im6o_multicast_hlim;
551 ip6->ip6_hlim = V_ip6_defmcasthlim;
556 * We may re-inject packets into the stack here.
558 if (needipsec && needipsectun) {
559 struct ipsec_output_state state;
562 * All the extension headers will become inaccessible
563 * (since they can be encrypted).
564 * Don't panic, we need no more updates to extension headers
565 * on inner IPv6 packet (since they are now encapsulated).
567 * IPv6 [ESP|AH] IPv6 [extension headers] payload
569 bzero(&exthdrs, sizeof(exthdrs));
570 exthdrs.ip6e_ip6 = m;
572 bzero(&state, sizeof(state));
574 state.ro = (struct route *)ro;
575 state.dst = (struct sockaddr *)dst;
577 error = ipsec6_output_tunnel(&state, sp, flags);
580 ro = (struct route_in6 *)state.ro;
581 dst = (struct sockaddr_in6 *)state.dst;
582 if (error == EJUSTRETURN) {
584 * We had a SP with a level of 'use' and no SA. We
585 * will just continue to process the packet without
590 /* mbuf is already reclaimed in ipsec6_output_tunnel. */
601 printf("[%s:%d] (ipsec): error code %d\n",
602 __func__, __LINE__, error);
605 /* don't show these error codes to the user */
612 * In the FAST IPSec case we have already
613 * re-injected the packet and it has been freed
614 * by the ipsec_done() function. So, just clean
615 * up after ourselves.
621 exthdrs.ip6e_ip6 = m;
626 ip6 = mtod(m, struct ip6_hdr *);
628 if (ro->ro_rt && fwd_tag == NULL) {
630 ifp = ro->ro_rt->rt_ifp;
632 if (fwd_tag == NULL) {
633 bzero(&dst_sa, sizeof(dst_sa));
634 dst_sa.sin6_family = AF_INET6;
635 dst_sa.sin6_len = sizeof(dst_sa);
636 dst_sa.sin6_addr = ip6->ip6_dst;
638 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp,
639 &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m));
642 in6_ifstat_inc(ifp, ifs6_out_discard);
648 * If in6_selectroute() does not return a route entry,
649 * dst may not have been updated.
651 *dst = dst_sa; /* XXX */
655 * then rt (for unicast) and ifp must be non-NULL valid values.
657 if ((flags & IPV6_FORWARDING) == 0) {
658 /* XXX: the FORWARDING flag can be set for mrouting. */
659 in6_ifstat_inc(ifp, ifs6_out_request);
662 ia = (struct in6_ifaddr *)(rt->rt_ifa);
663 counter_u64_add(rt->rt_pksent, 1);
668 * The outgoing interface must be in the zone of source and
669 * destination addresses.
674 if (in6_setscope(&src0, origifp, &zone))
676 bzero(&src_sa, sizeof(src_sa));
677 src_sa.sin6_family = AF_INET6;
678 src_sa.sin6_len = sizeof(src_sa);
679 src_sa.sin6_addr = ip6->ip6_src;
680 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
684 if (in6_setscope(&dst0, origifp, &zone))
686 /* re-initialize to be sure */
687 bzero(&dst_sa, sizeof(dst_sa));
688 dst_sa.sin6_family = AF_INET6;
689 dst_sa.sin6_len = sizeof(dst_sa);
690 dst_sa.sin6_addr = ip6->ip6_dst;
691 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) {
695 /* We should use ia_ifp to support the case of
696 * sending packets to an address of our own.
698 if (ia != NULL && ia->ia_ifp)
701 /* scope check is done. */
705 IP6STAT_INC(ip6s_badscope);
706 in6_ifstat_inc(origifp, ifs6_out_discard);
708 error = EHOSTUNREACH; /* XXX */
712 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
713 if (opt && opt->ip6po_nextroute.ro_rt) {
715 * The nexthop is explicitly specified by the
716 * application. We assume the next hop is an IPv6
719 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
721 else if ((rt->rt_flags & RTF_GATEWAY))
722 dst = (struct sockaddr_in6 *)rt->rt_gateway;
725 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
726 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
728 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
729 in6_ifstat_inc(ifp, ifs6_out_mcast);
731 * Confirm that the outgoing interface supports multicast.
733 if (!(ifp->if_flags & IFF_MULTICAST)) {
734 IP6STAT_INC(ip6s_noroute);
735 in6_ifstat_inc(ifp, ifs6_out_discard);
739 if ((im6o == NULL && in6_mcast_loop) ||
740 (im6o && im6o->im6o_multicast_loop)) {
742 * Loop back multicast datagram if not expressly
743 * forbidden to do so, even if we have not joined
744 * the address; protocols will filter it later,
745 * thus deferring a hash lookup and lock acquisition
746 * at the expense of an m_copym().
748 ip6_mloopback(ifp, m, dst);
751 * If we are acting as a multicast router, perform
752 * multicast forwarding as if the packet had just
753 * arrived on the interface to which we are about
754 * to send. The multicast forwarding function
755 * recursively calls this function, using the
756 * IPV6_FORWARDING flag to prevent infinite recursion.
758 * Multicasts that are looped back by ip6_mloopback(),
759 * above, will be forwarded by the ip6_input() routine,
762 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
764 * XXX: ip6_mforward expects that rcvif is NULL
765 * when it is called from the originating path.
766 * However, it may not always be the case.
768 m->m_pkthdr.rcvif = NULL;
769 if (ip6_mforward(ip6, ifp, m) != 0) {
776 * Multicasts with a hoplimit of zero may be looped back,
777 * above, but must not be transmitted on a network.
778 * Also, multicasts addressed to the loopback interface
779 * are not sent -- the above call to ip6_mloopback() will
780 * loop back a copy if this host actually belongs to the
781 * destination group on the loopback interface.
783 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
784 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
791 * Fill the outgoing inteface to tell the upper layer
792 * to increment per-interface statistics.
797 /* Determine path MTU. */
798 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu,
799 &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0)
803 * The caller of this function may specify to use the minimum MTU
805 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
806 * setting. The logic is a bit complicated; by default, unicast
807 * packets will follow path MTU while multicast packets will be sent at
808 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
809 * including unicast ones will be sent at the minimum MTU. Multicast
810 * packets will always be sent at the minimum MTU unless
811 * IP6PO_MINMTU_DISABLE is explicitly specified.
812 * See RFC 3542 for more details.
814 if (mtu > IPV6_MMTU) {
815 if ((flags & IPV6_MINMTU))
817 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
819 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
821 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
827 * clear embedded scope identifiers if necessary.
828 * in6_clearscope will touch the addresses only when necessary.
830 in6_clearscope(&ip6->ip6_src);
831 in6_clearscope(&ip6->ip6_dst);
834 * If the outgoing packet contains a hop-by-hop options header,
835 * it must be examined and processed even by the source node.
836 * (RFC 2460, section 4.)
838 if (exthdrs.ip6e_hbh) {
839 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
840 u_int32_t dummy; /* XXX unused */
841 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
844 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
845 panic("ip6e_hbh is not contiguous");
848 * XXX: if we have to send an ICMPv6 error to the sender,
849 * we need the M_LOOP flag since icmp6_error() expects
850 * the IPv6 and the hop-by-hop options header are
851 * contiguous unless the flag is set.
853 m->m_flags |= M_LOOP;
854 m->m_pkthdr.rcvif = ifp;
855 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
856 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
857 &dummy, &plen) < 0) {
858 /* m was already freed at this point */
859 error = EINVAL;/* better error? */
862 m->m_flags &= ~M_LOOP; /* XXX */
863 m->m_pkthdr.rcvif = NULL;
866 /* Jump over all PFIL processing if hooks are not active. */
867 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
871 /* Run through list of hooks for output packets. */
872 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp);
873 if (error != 0 || m == NULL)
875 ip6 = mtod(m, struct ip6_hdr *);
877 /* See if destination IP address was changed by packet filter. */
878 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
879 m->m_flags |= M_SKIP_FIREWALL;
880 /* If destination is now ourself drop to ip6_input(). */
881 if (in6_localip(&ip6->ip6_dst)) {
882 m->m_flags |= M_FASTFWD_OURS;
883 if (m->m_pkthdr.rcvif == NULL)
884 m->m_pkthdr.rcvif = V_loif;
885 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
886 m->m_pkthdr.csum_flags |=
887 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
888 m->m_pkthdr.csum_data = 0xffff;
891 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
892 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
894 error = netisr_queue(NETISR_IPV6, m);
897 goto again; /* Redo the routing table lookup. */
900 /* See if local, if yes, send it to netisr. */
901 if (m->m_flags & M_FASTFWD_OURS) {
902 if (m->m_pkthdr.rcvif == NULL)
903 m->m_pkthdr.rcvif = V_loif;
904 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
905 m->m_pkthdr.csum_flags |=
906 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
907 m->m_pkthdr.csum_data = 0xffff;
910 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
911 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
913 error = netisr_queue(NETISR_IPV6, m);
916 /* Or forward to some other address? */
917 if ((m->m_flags & M_IP6_NEXTHOP) &&
918 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
919 dst = (struct sockaddr_in6 *)&ro->ro_dst;
920 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
921 m->m_flags |= M_SKIP_FIREWALL;
922 m->m_flags &= ~M_IP6_NEXTHOP;
923 m_tag_delete(m, fwd_tag);
929 * Send the packet to the outgoing interface.
930 * If necessary, do IPv6 fragmentation before sending.
932 * the logic here is rather complex:
933 * 1: normal case (dontfrag == 0, alwaysfrag == 0)
934 * 1-a: send as is if tlen <= path mtu
935 * 1-b: fragment if tlen > path mtu
937 * 2: if user asks us not to fragment (dontfrag == 1)
938 * 2-a: send as is if tlen <= interface mtu
939 * 2-b: error if tlen > interface mtu
941 * 3: if we always need to attach fragment header (alwaysfrag == 1)
944 * 4: if dontfrag == 1 && alwaysfrag == 1
945 * error, as we cannot handle this conflicting request
947 sw_csum = m->m_pkthdr.csum_flags;
949 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0;
950 sw_csum &= ~ifp->if_hwassist;
954 * If we added extension headers, we will not do TSO and calculate the
955 * checksums ourselves for now.
956 * XXX-BZ Need a framework to know when the NIC can handle it, even
959 if (sw_csum & CSUM_DELAY_DATA_IPV6) {
960 sw_csum &= ~CSUM_DELAY_DATA_IPV6;
961 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
964 if (sw_csum & CSUM_SCTP_IPV6) {
965 sw_csum &= ~CSUM_SCTP_IPV6;
966 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
969 m->m_pkthdr.csum_flags &= ifp->if_hwassist;
970 tlen = m->m_pkthdr.len;
972 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
976 if (dontfrag && alwaysfrag) { /* case 4 */
977 /* conflicting request - can't transmit */
981 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */
983 * Even if the DONTFRAG option is specified, we cannot send the
984 * packet when the data length is larger than the MTU of the
985 * outgoing interface.
986 * Notify the error by sending IPV6_PATHMTU ancillary data as
987 * well as returning an error code (the latter is not described
991 struct ip6ctlparam ip6cp;
993 mtu32 = (u_int32_t)mtu;
994 bzero(&ip6cp, sizeof(ip6cp));
995 ip6cp.ip6c_cmdarg = (void *)&mtu32;
996 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
1004 * transmit packet without fragmentation
1006 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
1007 struct in6_ifaddr *ia6;
1009 ip6 = mtod(m, struct ip6_hdr *);
1010 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
1012 /* Record statistics for this interface address. */
1013 ia6->ia_ifa.if_opackets++;
1014 ia6->ia_ifa.if_obytes += m->m_pkthdr.len;
1015 ifa_free(&ia6->ia_ifa);
1017 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
1022 * try to fragment the packet. case 1-b and 3
1024 if (mtu < IPV6_MMTU) {
1025 /* path MTU cannot be less than IPV6_MMTU */
1027 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1029 } else if (ip6->ip6_plen == 0) {
1030 /* jumbo payload cannot be fragmented */
1032 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1035 struct mbuf **mnext, *m_frgpart;
1036 struct ip6_frag *ip6f;
1037 u_int32_t id = htonl(ip6_randomid());
1040 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len;
1043 * Too large for the destination or interface;
1044 * fragment if possible.
1045 * Must be able to put at least 8 bytes per fragment.
1047 hlen = unfragpartlen;
1048 if (mtu > IPV6_MAXPACKET)
1049 mtu = IPV6_MAXPACKET;
1051 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
1054 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1059 * Verify that we have any chance at all of being able to queue
1060 * the packet or packet fragments
1062 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen)
1063 < tlen /* - hlen */)) {
1065 IP6STAT_INC(ip6s_odropped);
1071 * If the interface will not calculate checksums on
1072 * fragmented packets, then do it here.
1073 * XXX-BZ handle the hw offloading case. Need flags.
1075 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1076 in6_delayed_cksum(m, plen, hlen);
1077 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
1080 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
1081 sctp_delayed_cksum(m, hlen);
1082 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
1085 mnext = &m->m_nextpkt;
1088 * Change the next header field of the last header in the
1089 * unfragmentable part.
1091 if (exthdrs.ip6e_rthdr) {
1092 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
1093 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
1094 } else if (exthdrs.ip6e_dest1) {
1095 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
1096 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
1097 } else if (exthdrs.ip6e_hbh) {
1098 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
1099 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
1101 nextproto = ip6->ip6_nxt;
1102 ip6->ip6_nxt = IPPROTO_FRAGMENT;
1106 * Loop through length of segment after first fragment,
1107 * make new header and copy data of each part and link onto
1111 for (off = hlen; off < tlen; off += len) {
1112 m = m_gethdr(M_NOWAIT, MT_DATA);
1115 IP6STAT_INC(ip6s_odropped);
1118 m->m_flags = m0->m_flags & M_COPYFLAGS;
1120 mnext = &m->m_nextpkt;
1121 m->m_data += max_linkhdr;
1122 mhip6 = mtod(m, struct ip6_hdr *);
1124 m->m_len = sizeof(*mhip6);
1125 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
1127 IP6STAT_INC(ip6s_odropped);
1130 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
1131 if (off + len >= tlen)
1134 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
1135 mhip6->ip6_plen = htons((u_short)(len + hlen +
1136 sizeof(*ip6f) - sizeof(struct ip6_hdr)));
1137 if ((m_frgpart = m_copy(m0, off, len)) == 0) {
1139 IP6STAT_INC(ip6s_odropped);
1142 m_cat(m, m_frgpart);
1143 m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
1144 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum;
1145 m->m_pkthdr.rcvif = NULL;
1146 ip6f->ip6f_reserved = 0;
1147 ip6f->ip6f_ident = id;
1148 ip6f->ip6f_nxt = nextproto;
1149 IP6STAT_INC(ip6s_ofragments);
1150 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
1153 in6_ifstat_inc(ifp, ifs6_out_fragok);
1157 * Remove leading garbages.
1163 for (m0 = m; m; m = m0) {
1167 /* Record statistics for this interface address. */
1169 ia->ia_ifa.if_opackets++;
1170 ia->ia_ifa.if_obytes += m->m_pkthdr.len;
1172 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
1178 IP6STAT_INC(ip6s_fragmented);
1181 if (ro == &ip6route)
1183 if (ro_pmtu == &ip6route)
1193 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */
1194 m_freem(exthdrs.ip6e_dest1);
1195 m_freem(exthdrs.ip6e_rthdr);
1196 m_freem(exthdrs.ip6e_dest2);
1205 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1209 if (hlen > MCLBYTES)
1210 return (ENOBUFS); /* XXX */
1213 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1215 m = m_get(M_NOWAIT, MT_DATA);
1220 bcopy(hdr, mtod(m, caddr_t), hlen);
1227 * Insert jumbo payload option.
1230 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1236 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */
1239 * If there is no hop-by-hop options header, allocate new one.
1240 * If there is one but it doesn't have enough space to store the
1241 * jumbo payload option, allocate a cluster to store the whole options.
1242 * Otherwise, use it to store the options.
1244 if (exthdrs->ip6e_hbh == 0) {
1245 mopt = m_get(M_NOWAIT, MT_DATA);
1248 mopt->m_len = JUMBOOPTLEN;
1249 optbuf = mtod(mopt, u_char *);
1250 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */
1251 exthdrs->ip6e_hbh = mopt;
1253 struct ip6_hbh *hbh;
1255 mopt = exthdrs->ip6e_hbh;
1256 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1259 * - exthdrs->ip6e_hbh is not referenced from places
1260 * other than exthdrs.
1261 * - exthdrs->ip6e_hbh is not an mbuf chain.
1263 int oldoptlen = mopt->m_len;
1267 * XXX: give up if the whole (new) hbh header does
1268 * not fit even in an mbuf cluster.
1270 if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1274 * As a consequence, we must always prepare a cluster
1277 n = m_getcl(M_NOWAIT, MT_DATA, 0);
1280 n->m_len = oldoptlen + JUMBOOPTLEN;
1281 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
1283 optbuf = mtod(n, caddr_t) + oldoptlen;
1285 mopt = exthdrs->ip6e_hbh = n;
1287 optbuf = mtod(mopt, u_char *) + mopt->m_len;
1288 mopt->m_len += JUMBOOPTLEN;
1290 optbuf[0] = IP6OPT_PADN;
1294 * Adjust the header length according to the pad and
1295 * the jumbo payload option.
1297 hbh = mtod(mopt, struct ip6_hbh *);
1298 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1301 /* fill in the option. */
1302 optbuf[2] = IP6OPT_JUMBO;
1304 v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1305 bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1307 /* finally, adjust the packet header length */
1308 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1315 * Insert fragment header and copy unfragmentable header portions.
1318 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1319 struct ip6_frag **frghdrp)
1321 struct mbuf *n, *mlast;
1323 if (hlen > sizeof(struct ip6_hdr)) {
1324 n = m_copym(m0, sizeof(struct ip6_hdr),
1325 hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1332 /* Search for the last mbuf of unfragmentable part. */
1333 for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1336 if ((mlast->m_flags & M_EXT) == 0 &&
1337 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1338 /* use the trailing space of the last mbuf for the fragment hdr */
1339 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1341 mlast->m_len += sizeof(struct ip6_frag);
1342 m->m_pkthdr.len += sizeof(struct ip6_frag);
1344 /* allocate a new mbuf for the fragment header */
1347 mfrg = m_get(M_NOWAIT, MT_DATA);
1350 mfrg->m_len = sizeof(struct ip6_frag);
1351 *frghdrp = mtod(mfrg, struct ip6_frag *);
1352 mlast->m_next = mfrg;
1359 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro,
1360 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup,
1361 int *alwaysfragp, u_int fibnum)
1367 if (ro_pmtu != ro) {
1368 /* The first hop and the final destination may differ. */
1369 struct sockaddr_in6 *sa6_dst =
1370 (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1371 if (ro_pmtu->ro_rt &&
1372 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 ||
1373 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) {
1374 RTFREE(ro_pmtu->ro_rt);
1375 ro_pmtu->ro_rt = (struct rtentry *)NULL;
1377 if (ro_pmtu->ro_rt == NULL) {
1378 bzero(sa6_dst, sizeof(*sa6_dst));
1379 sa6_dst->sin6_family = AF_INET6;
1380 sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1381 sa6_dst->sin6_addr = *dst;
1383 in6_rtalloc(ro_pmtu, fibnum);
1386 if (ro_pmtu->ro_rt) {
1388 struct in_conninfo inc;
1390 bzero(&inc, sizeof(inc));
1391 inc.inc_flags |= INC_ISIPV6;
1392 inc.inc6_faddr = *dst;
1395 ifp = ro_pmtu->ro_rt->rt_ifp;
1396 ifmtu = IN6_LINKMTU(ifp);
1397 mtu = tcp_hc_getmtu(&inc);
1399 mtu = min(mtu, ro_pmtu->ro_rt->rt_mtu);
1401 mtu = ro_pmtu->ro_rt->rt_mtu;
1404 else if (mtu < IPV6_MMTU) {
1406 * RFC2460 section 5, last paragraph:
1407 * if we record ICMPv6 too big message with
1408 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1409 * or smaller, with framgent header attached.
1410 * (fragment header is needed regardless from the
1411 * packet size, for translators to identify packets)
1415 } else if (mtu > ifmtu) {
1417 * The MTU on the route is larger than the MTU on
1418 * the interface! This shouldn't happen, unless the
1419 * MTU of the interface has been changed after the
1420 * interface was brought up. Change the MTU in the
1421 * route to match the interface MTU (as long as the
1422 * field isn't locked).
1425 ro_pmtu->ro_rt->rt_mtu = mtu;
1428 mtu = IN6_LINKMTU(ifp);
1430 error = EHOSTUNREACH; /* XXX */
1434 *alwaysfragp = alwaysfrag;
1439 * IP6 socket option processing.
1442 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1444 int optdatalen, uproto;
1446 struct inpcb *in6p = sotoinpcb(so);
1448 int level, op, optname;
1452 level = sopt->sopt_level;
1453 op = sopt->sopt_dir;
1454 optname = sopt->sopt_name;
1455 optlen = sopt->sopt_valsize;
1459 uproto = (int)so->so_proto->pr_protocol;
1461 if (level != IPPROTO_IPV6) {
1464 if (sopt->sopt_level == SOL_SOCKET &&
1465 sopt->sopt_dir == SOPT_SET) {
1466 switch (sopt->sopt_name) {
1469 if ((so->so_options & SO_REUSEADDR) != 0)
1470 in6p->inp_flags2 |= INP_REUSEADDR;
1472 in6p->inp_flags2 &= ~INP_REUSEADDR;
1478 if ((so->so_options & SO_REUSEPORT) != 0)
1479 in6p->inp_flags2 |= INP_REUSEPORT;
1481 in6p->inp_flags2 &= ~INP_REUSEPORT;
1487 in6p->inp_inc.inc_fibnum = so->so_fibnum;
1495 } else { /* level == IPPROTO_IPV6 */
1500 case IPV6_2292PKTOPTIONS:
1501 #ifdef IPV6_PKTOPTIONS
1502 case IPV6_PKTOPTIONS:
1507 error = soopt_getm(sopt, &m); /* XXX */
1510 error = soopt_mcopyin(sopt, m); /* XXX */
1513 error = ip6_pcbopts(&in6p->in6p_outputopts,
1515 m_freem(m); /* XXX */
1520 * Use of some Hop-by-Hop options or some
1521 * Destination options, might require special
1522 * privilege. That is, normal applications
1523 * (without special privilege) might be forbidden
1524 * from setting certain options in outgoing packets,
1525 * and might never see certain options in received
1526 * packets. [RFC 2292 Section 6]
1527 * KAME specific note:
1528 * KAME prevents non-privileged users from sending or
1529 * receiving ANY hbh/dst options in order to avoid
1530 * overhead of parsing options in the kernel.
1532 case IPV6_RECVHOPOPTS:
1533 case IPV6_RECVDSTOPTS:
1534 case IPV6_RECVRTHDRDSTOPTS:
1536 error = priv_check(td,
1537 PRIV_NETINET_SETHDROPTS);
1542 case IPV6_UNICAST_HOPS:
1546 case IPV6_RECVPKTINFO:
1547 case IPV6_RECVHOPLIMIT:
1548 case IPV6_RECVRTHDR:
1549 case IPV6_RECVPATHMTU:
1550 case IPV6_RECVTCLASS:
1552 case IPV6_AUTOFLOWLABEL:
1554 if (optname == IPV6_BINDANY && td != NULL) {
1555 error = priv_check(td,
1556 PRIV_NETINET_BINDANY);
1561 if (optlen != sizeof(int)) {
1565 error = sooptcopyin(sopt, &optval,
1566 sizeof optval, sizeof optval);
1571 case IPV6_UNICAST_HOPS:
1572 if (optval < -1 || optval >= 256)
1575 /* -1 = kernel default */
1576 in6p->in6p_hops = optval;
1577 if ((in6p->inp_vflag &
1579 in6p->inp_ip_ttl = optval;
1582 #define OPTSET(bit) \
1586 in6p->inp_flags |= (bit); \
1588 in6p->inp_flags &= ~(bit); \
1589 INP_WUNLOCK(in6p); \
1590 } while (/*CONSTCOND*/ 0)
1591 #define OPTSET2292(bit) \
1594 in6p->inp_flags |= IN6P_RFC2292; \
1596 in6p->inp_flags |= (bit); \
1598 in6p->inp_flags &= ~(bit); \
1599 INP_WUNLOCK(in6p); \
1600 } while (/*CONSTCOND*/ 0)
1601 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0)
1603 case IPV6_RECVPKTINFO:
1604 /* cannot mix with RFC2292 */
1605 if (OPTBIT(IN6P_RFC2292)) {
1609 OPTSET(IN6P_PKTINFO);
1614 struct ip6_pktopts **optp;
1616 /* cannot mix with RFC2292 */
1617 if (OPTBIT(IN6P_RFC2292)) {
1621 optp = &in6p->in6p_outputopts;
1622 error = ip6_pcbopt(IPV6_HOPLIMIT,
1623 (u_char *)&optval, sizeof(optval),
1624 optp, (td != NULL) ? td->td_ucred :
1629 case IPV6_RECVHOPLIMIT:
1630 /* cannot mix with RFC2292 */
1631 if (OPTBIT(IN6P_RFC2292)) {
1635 OPTSET(IN6P_HOPLIMIT);
1638 case IPV6_RECVHOPOPTS:
1639 /* cannot mix with RFC2292 */
1640 if (OPTBIT(IN6P_RFC2292)) {
1644 OPTSET(IN6P_HOPOPTS);
1647 case IPV6_RECVDSTOPTS:
1648 /* cannot mix with RFC2292 */
1649 if (OPTBIT(IN6P_RFC2292)) {
1653 OPTSET(IN6P_DSTOPTS);
1656 case IPV6_RECVRTHDRDSTOPTS:
1657 /* cannot mix with RFC2292 */
1658 if (OPTBIT(IN6P_RFC2292)) {
1662 OPTSET(IN6P_RTHDRDSTOPTS);
1665 case IPV6_RECVRTHDR:
1666 /* cannot mix with RFC2292 */
1667 if (OPTBIT(IN6P_RFC2292)) {
1678 case IPV6_RECVPATHMTU:
1680 * We ignore this option for TCP
1682 * (RFC3542 leaves this case
1685 if (uproto != IPPROTO_TCP)
1691 * make setsockopt(IPV6_V6ONLY)
1692 * available only prior to bind(2).
1693 * see ipng mailing list, Jun 22 2001.
1695 if (in6p->inp_lport ||
1696 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1700 OPTSET(IN6P_IPV6_V6ONLY);
1702 in6p->inp_vflag &= ~INP_IPV4;
1704 in6p->inp_vflag |= INP_IPV4;
1706 case IPV6_RECVTCLASS:
1707 /* cannot mix with RFC2292 XXX */
1708 if (OPTBIT(IN6P_RFC2292)) {
1712 OPTSET(IN6P_TCLASS);
1714 case IPV6_AUTOFLOWLABEL:
1715 OPTSET(IN6P_AUTOFLOWLABEL);
1719 OPTSET(INP_BINDANY);
1726 case IPV6_USE_MIN_MTU:
1727 case IPV6_PREFER_TEMPADDR:
1728 if (optlen != sizeof(optval)) {
1732 error = sooptcopyin(sopt, &optval,
1733 sizeof optval, sizeof optval);
1737 struct ip6_pktopts **optp;
1738 optp = &in6p->in6p_outputopts;
1739 error = ip6_pcbopt(optname,
1740 (u_char *)&optval, sizeof(optval),
1741 optp, (td != NULL) ? td->td_ucred :
1746 case IPV6_2292PKTINFO:
1747 case IPV6_2292HOPLIMIT:
1748 case IPV6_2292HOPOPTS:
1749 case IPV6_2292DSTOPTS:
1750 case IPV6_2292RTHDR:
1752 if (optlen != sizeof(int)) {
1756 error = sooptcopyin(sopt, &optval,
1757 sizeof optval, sizeof optval);
1761 case IPV6_2292PKTINFO:
1762 OPTSET2292(IN6P_PKTINFO);
1764 case IPV6_2292HOPLIMIT:
1765 OPTSET2292(IN6P_HOPLIMIT);
1767 case IPV6_2292HOPOPTS:
1769 * Check super-user privilege.
1770 * See comments for IPV6_RECVHOPOPTS.
1773 error = priv_check(td,
1774 PRIV_NETINET_SETHDROPTS);
1778 OPTSET2292(IN6P_HOPOPTS);
1780 case IPV6_2292DSTOPTS:
1782 error = priv_check(td,
1783 PRIV_NETINET_SETHDROPTS);
1787 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1789 case IPV6_2292RTHDR:
1790 OPTSET2292(IN6P_RTHDR);
1798 case IPV6_RTHDRDSTOPTS:
1801 /* new advanced API (RFC3542) */
1803 u_char optbuf_storage[MCLBYTES];
1805 struct ip6_pktopts **optp;
1807 /* cannot mix with RFC2292 */
1808 if (OPTBIT(IN6P_RFC2292)) {
1814 * We only ensure valsize is not too large
1815 * here. Further validation will be done
1818 error = sooptcopyin(sopt, optbuf_storage,
1819 sizeof(optbuf_storage), 0);
1822 optlen = sopt->sopt_valsize;
1823 optbuf = optbuf_storage;
1824 optp = &in6p->in6p_outputopts;
1825 error = ip6_pcbopt(optname, optbuf, optlen,
1826 optp, (td != NULL) ? td->td_ucred : NULL,
1832 case IPV6_MULTICAST_IF:
1833 case IPV6_MULTICAST_HOPS:
1834 case IPV6_MULTICAST_LOOP:
1835 case IPV6_JOIN_GROUP:
1836 case IPV6_LEAVE_GROUP:
1838 case MCAST_BLOCK_SOURCE:
1839 case MCAST_UNBLOCK_SOURCE:
1840 case MCAST_JOIN_GROUP:
1841 case MCAST_LEAVE_GROUP:
1842 case MCAST_JOIN_SOURCE_GROUP:
1843 case MCAST_LEAVE_SOURCE_GROUP:
1844 error = ip6_setmoptions(in6p, sopt);
1847 case IPV6_PORTRANGE:
1848 error = sooptcopyin(sopt, &optval,
1849 sizeof optval, sizeof optval);
1855 case IPV6_PORTRANGE_DEFAULT:
1856 in6p->inp_flags &= ~(INP_LOWPORT);
1857 in6p->inp_flags &= ~(INP_HIGHPORT);
1860 case IPV6_PORTRANGE_HIGH:
1861 in6p->inp_flags &= ~(INP_LOWPORT);
1862 in6p->inp_flags |= INP_HIGHPORT;
1865 case IPV6_PORTRANGE_LOW:
1866 in6p->inp_flags &= ~(INP_HIGHPORT);
1867 in6p->inp_flags |= INP_LOWPORT;
1878 case IPV6_IPSEC_POLICY:
1883 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1885 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
1887 req = mtod(m, caddr_t);
1888 error = ipsec_set_policy(in6p, optname, req,
1889 m->m_len, (sopt->sopt_td != NULL) ?
1890 sopt->sopt_td->td_ucred : NULL);
1897 error = ENOPROTOOPT;
1905 case IPV6_2292PKTOPTIONS:
1906 #ifdef IPV6_PKTOPTIONS
1907 case IPV6_PKTOPTIONS:
1910 * RFC3542 (effectively) deprecated the
1911 * semantics of the 2292-style pktoptions.
1912 * Since it was not reliable in nature (i.e.,
1913 * applications had to expect the lack of some
1914 * information after all), it would make sense
1915 * to simplify this part by always returning
1918 sopt->sopt_valsize = 0;
1921 case IPV6_RECVHOPOPTS:
1922 case IPV6_RECVDSTOPTS:
1923 case IPV6_RECVRTHDRDSTOPTS:
1924 case IPV6_UNICAST_HOPS:
1925 case IPV6_RECVPKTINFO:
1926 case IPV6_RECVHOPLIMIT:
1927 case IPV6_RECVRTHDR:
1928 case IPV6_RECVPATHMTU:
1932 case IPV6_PORTRANGE:
1933 case IPV6_RECVTCLASS:
1934 case IPV6_AUTOFLOWLABEL:
1938 case IPV6_RECVHOPOPTS:
1939 optval = OPTBIT(IN6P_HOPOPTS);
1942 case IPV6_RECVDSTOPTS:
1943 optval = OPTBIT(IN6P_DSTOPTS);
1946 case IPV6_RECVRTHDRDSTOPTS:
1947 optval = OPTBIT(IN6P_RTHDRDSTOPTS);
1950 case IPV6_UNICAST_HOPS:
1951 optval = in6p->in6p_hops;
1954 case IPV6_RECVPKTINFO:
1955 optval = OPTBIT(IN6P_PKTINFO);
1958 case IPV6_RECVHOPLIMIT:
1959 optval = OPTBIT(IN6P_HOPLIMIT);
1962 case IPV6_RECVRTHDR:
1963 optval = OPTBIT(IN6P_RTHDR);
1966 case IPV6_RECVPATHMTU:
1967 optval = OPTBIT(IN6P_MTU);
1971 optval = OPTBIT(INP_FAITH);
1975 optval = OPTBIT(IN6P_IPV6_V6ONLY);
1978 case IPV6_PORTRANGE:
1981 flags = in6p->inp_flags;
1982 if (flags & INP_HIGHPORT)
1983 optval = IPV6_PORTRANGE_HIGH;
1984 else if (flags & INP_LOWPORT)
1985 optval = IPV6_PORTRANGE_LOW;
1990 case IPV6_RECVTCLASS:
1991 optval = OPTBIT(IN6P_TCLASS);
1994 case IPV6_AUTOFLOWLABEL:
1995 optval = OPTBIT(IN6P_AUTOFLOWLABEL);
1999 optval = OPTBIT(INP_BINDANY);
2004 error = sooptcopyout(sopt, &optval,
2011 struct ip6_mtuinfo mtuinfo;
2012 struct route_in6 sro;
2014 bzero(&sro, sizeof(sro));
2016 if (!(so->so_state & SS_ISCONNECTED))
2019 * XXX: we dot not consider the case of source
2020 * routing, or optional information to specify
2021 * the outgoing interface.
2023 error = ip6_getpmtu(&sro, NULL, NULL,
2024 &in6p->in6p_faddr, &pmtu, NULL,
2030 if (pmtu > IPV6_MAXPACKET)
2031 pmtu = IPV6_MAXPACKET;
2033 bzero(&mtuinfo, sizeof(mtuinfo));
2034 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
2035 optdata = (void *)&mtuinfo;
2036 optdatalen = sizeof(mtuinfo);
2037 error = sooptcopyout(sopt, optdata,
2042 case IPV6_2292PKTINFO:
2043 case IPV6_2292HOPLIMIT:
2044 case IPV6_2292HOPOPTS:
2045 case IPV6_2292RTHDR:
2046 case IPV6_2292DSTOPTS:
2048 case IPV6_2292PKTINFO:
2049 optval = OPTBIT(IN6P_PKTINFO);
2051 case IPV6_2292HOPLIMIT:
2052 optval = OPTBIT(IN6P_HOPLIMIT);
2054 case IPV6_2292HOPOPTS:
2055 optval = OPTBIT(IN6P_HOPOPTS);
2057 case IPV6_2292RTHDR:
2058 optval = OPTBIT(IN6P_RTHDR);
2060 case IPV6_2292DSTOPTS:
2061 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
2064 error = sooptcopyout(sopt, &optval,
2071 case IPV6_RTHDRDSTOPTS:
2075 case IPV6_USE_MIN_MTU:
2076 case IPV6_PREFER_TEMPADDR:
2077 error = ip6_getpcbopt(in6p->in6p_outputopts,
2081 case IPV6_MULTICAST_IF:
2082 case IPV6_MULTICAST_HOPS:
2083 case IPV6_MULTICAST_LOOP:
2085 error = ip6_getmoptions(in6p, sopt);
2089 case IPV6_IPSEC_POLICY:
2093 struct mbuf *m = NULL;
2094 struct mbuf **mp = &m;
2095 size_t ovalsize = sopt->sopt_valsize;
2096 caddr_t oval = (caddr_t)sopt->sopt_val;
2098 error = soopt_getm(sopt, &m); /* XXX */
2101 error = soopt_mcopyin(sopt, m); /* XXX */
2104 sopt->sopt_valsize = ovalsize;
2105 sopt->sopt_val = oval;
2107 req = mtod(m, caddr_t);
2110 error = ipsec_get_policy(in6p, req, len, mp);
2112 error = soopt_mcopyout(sopt, m); /* XXX */
2113 if (error == 0 && m)
2120 error = ENOPROTOOPT;
2130 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2132 int error = 0, optval, optlen;
2133 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2134 struct inpcb *in6p = sotoinpcb(so);
2135 int level, op, optname;
2137 level = sopt->sopt_level;
2138 op = sopt->sopt_dir;
2139 optname = sopt->sopt_name;
2140 optlen = sopt->sopt_valsize;
2142 if (level != IPPROTO_IPV6) {
2149 * For ICMPv6 sockets, no modification allowed for checksum
2150 * offset, permit "no change" values to help existing apps.
2152 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2153 * for an ICMPv6 socket will fail."
2154 * The current behavior does not meet RFC3542.
2158 if (optlen != sizeof(int)) {
2162 error = sooptcopyin(sopt, &optval, sizeof(optval),
2166 if ((optval % 2) != 0) {
2167 /* the API assumes even offset values */
2169 } else if (so->so_proto->pr_protocol ==
2171 if (optval != icmp6off)
2174 in6p->in6p_cksum = optval;
2178 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
2181 optval = in6p->in6p_cksum;
2183 error = sooptcopyout(sopt, &optval, sizeof(optval));
2193 error = ENOPROTOOPT;
2201 * Set up IP6 options in pcb for insertion in output packets or
2202 * specifying behavior of outgoing packets.
2205 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2206 struct socket *so, struct sockopt *sopt)
2208 struct ip6_pktopts *opt = *pktopt;
2210 struct thread *td = sopt->sopt_td;
2212 /* turn off any old options. */
2215 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2216 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2217 opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2218 printf("ip6_pcbopts: all specified options are cleared.\n");
2220 ip6_clearpktopts(opt, -1);
2222 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2225 if (!m || m->m_len == 0) {
2227 * Only turning off any previous options, regardless of
2228 * whether the opt is just created or given.
2230 free(opt, M_IP6OPT);
2234 /* set options specified by user. */
2235 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2236 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2237 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2238 free(opt, M_IP6OPT);
2246 * initialize ip6_pktopts. beware that there are non-zero default values in
2250 ip6_initpktopts(struct ip6_pktopts *opt)
2253 bzero(opt, sizeof(*opt));
2254 opt->ip6po_hlim = -1; /* -1 means default hop limit */
2255 opt->ip6po_tclass = -1; /* -1 means default traffic class */
2256 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2257 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2261 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2262 struct ucred *cred, int uproto)
2264 struct ip6_pktopts *opt;
2266 if (*pktopt == NULL) {
2267 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2269 ip6_initpktopts(*pktopt);
2273 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
2277 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt)
2279 void *optdata = NULL;
2281 struct ip6_ext *ip6e;
2283 struct in6_pktinfo null_pktinfo;
2284 int deftclass = 0, on;
2285 int defminmtu = IP6PO_MINMTU_MCASTONLY;
2286 int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2290 if (pktopt && pktopt->ip6po_pktinfo)
2291 optdata = (void *)pktopt->ip6po_pktinfo;
2293 /* XXX: we don't have to do this every time... */
2294 bzero(&null_pktinfo, sizeof(null_pktinfo));
2295 optdata = (void *)&null_pktinfo;
2297 optdatalen = sizeof(struct in6_pktinfo);
2300 if (pktopt && pktopt->ip6po_tclass >= 0)
2301 optdata = (void *)&pktopt->ip6po_tclass;
2303 optdata = (void *)&deftclass;
2304 optdatalen = sizeof(int);
2307 if (pktopt && pktopt->ip6po_hbh) {
2308 optdata = (void *)pktopt->ip6po_hbh;
2309 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
2310 optdatalen = (ip6e->ip6e_len + 1) << 3;
2314 if (pktopt && pktopt->ip6po_rthdr) {
2315 optdata = (void *)pktopt->ip6po_rthdr;
2316 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
2317 optdatalen = (ip6e->ip6e_len + 1) << 3;
2320 case IPV6_RTHDRDSTOPTS:
2321 if (pktopt && pktopt->ip6po_dest1) {
2322 optdata = (void *)pktopt->ip6po_dest1;
2323 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
2324 optdatalen = (ip6e->ip6e_len + 1) << 3;
2328 if (pktopt && pktopt->ip6po_dest2) {
2329 optdata = (void *)pktopt->ip6po_dest2;
2330 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
2331 optdatalen = (ip6e->ip6e_len + 1) << 3;
2335 if (pktopt && pktopt->ip6po_nexthop) {
2336 optdata = (void *)pktopt->ip6po_nexthop;
2337 optdatalen = pktopt->ip6po_nexthop->sa_len;
2340 case IPV6_USE_MIN_MTU:
2342 optdata = (void *)&pktopt->ip6po_minmtu;
2344 optdata = (void *)&defminmtu;
2345 optdatalen = sizeof(int);
2348 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2352 optdata = (void *)&on;
2353 optdatalen = sizeof(on);
2355 case IPV6_PREFER_TEMPADDR:
2357 optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
2359 optdata = (void *)&defpreftemp;
2360 optdatalen = sizeof(int);
2362 default: /* should not happen */
2364 panic("ip6_getpcbopt: unexpected option\n");
2366 return (ENOPROTOOPT);
2369 error = sooptcopyout(sopt, optdata, optdatalen);
2375 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2380 if (optname == -1 || optname == IPV6_PKTINFO) {
2381 if (pktopt->ip6po_pktinfo)
2382 free(pktopt->ip6po_pktinfo, M_IP6OPT);
2383 pktopt->ip6po_pktinfo = NULL;
2385 if (optname == -1 || optname == IPV6_HOPLIMIT)
2386 pktopt->ip6po_hlim = -1;
2387 if (optname == -1 || optname == IPV6_TCLASS)
2388 pktopt->ip6po_tclass = -1;
2389 if (optname == -1 || optname == IPV6_NEXTHOP) {
2390 if (pktopt->ip6po_nextroute.ro_rt) {
2391 RTFREE(pktopt->ip6po_nextroute.ro_rt);
2392 pktopt->ip6po_nextroute.ro_rt = NULL;
2394 if (pktopt->ip6po_nexthop)
2395 free(pktopt->ip6po_nexthop, M_IP6OPT);
2396 pktopt->ip6po_nexthop = NULL;
2398 if (optname == -1 || optname == IPV6_HOPOPTS) {
2399 if (pktopt->ip6po_hbh)
2400 free(pktopt->ip6po_hbh, M_IP6OPT);
2401 pktopt->ip6po_hbh = NULL;
2403 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2404 if (pktopt->ip6po_dest1)
2405 free(pktopt->ip6po_dest1, M_IP6OPT);
2406 pktopt->ip6po_dest1 = NULL;
2408 if (optname == -1 || optname == IPV6_RTHDR) {
2409 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2410 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2411 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2412 if (pktopt->ip6po_route.ro_rt) {
2413 RTFREE(pktopt->ip6po_route.ro_rt);
2414 pktopt->ip6po_route.ro_rt = NULL;
2417 if (optname == -1 || optname == IPV6_DSTOPTS) {
2418 if (pktopt->ip6po_dest2)
2419 free(pktopt->ip6po_dest2, M_IP6OPT);
2420 pktopt->ip6po_dest2 = NULL;
2424 #define PKTOPT_EXTHDRCPY(type) \
2427 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2428 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2429 if (dst->type == NULL && canwait == M_NOWAIT)\
2431 bcopy(src->type, dst->type, hlen);\
2433 } while (/*CONSTCOND*/ 0)
2436 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2438 if (dst == NULL || src == NULL) {
2439 printf("ip6_clearpktopts: invalid argument\n");
2443 dst->ip6po_hlim = src->ip6po_hlim;
2444 dst->ip6po_tclass = src->ip6po_tclass;
2445 dst->ip6po_flags = src->ip6po_flags;
2446 dst->ip6po_minmtu = src->ip6po_minmtu;
2447 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2448 if (src->ip6po_pktinfo) {
2449 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2451 if (dst->ip6po_pktinfo == NULL)
2453 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2455 if (src->ip6po_nexthop) {
2456 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2458 if (dst->ip6po_nexthop == NULL)
2460 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2461 src->ip6po_nexthop->sa_len);
2463 PKTOPT_EXTHDRCPY(ip6po_hbh);
2464 PKTOPT_EXTHDRCPY(ip6po_dest1);
2465 PKTOPT_EXTHDRCPY(ip6po_dest2);
2466 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2470 ip6_clearpktopts(dst, -1);
2473 #undef PKTOPT_EXTHDRCPY
2475 struct ip6_pktopts *
2476 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2479 struct ip6_pktopts *dst;
2481 dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2484 ip6_initpktopts(dst);
2486 if ((error = copypktopts(dst, src, canwait)) != 0) {
2487 free(dst, M_IP6OPT);
2495 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2500 ip6_clearpktopts(pktopt, -1);
2502 free(pktopt, M_IP6OPT);
2506 * Set IPv6 outgoing packet options based on advanced API.
2509 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2510 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2512 struct cmsghdr *cm = 0;
2514 if (control == NULL || opt == NULL)
2517 ip6_initpktopts(opt);
2522 * If stickyopt is provided, make a local copy of the options
2523 * for this particular packet, then override them by ancillary
2525 * XXX: copypktopts() does not copy the cached route to a next
2526 * hop (if any). This is not very good in terms of efficiency,
2527 * but we can allow this since this option should be rarely
2530 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2535 * XXX: Currently, we assume all the optional information is stored
2538 if (control->m_next)
2541 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2542 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2545 if (control->m_len < CMSG_LEN(0))
2548 cm = mtod(control, struct cmsghdr *);
2549 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2551 if (cm->cmsg_level != IPPROTO_IPV6)
2554 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2555 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2564 * Set a particular packet option, as a sticky option or an ancillary data
2565 * item. "len" can be 0 only when it's a sticky option.
2566 * We have 4 cases of combination of "sticky" and "cmsg":
2567 * "sticky=0, cmsg=0": impossible
2568 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2569 * "sticky=1, cmsg=0": RFC3542 socket option
2570 * "sticky=1, cmsg=1": RFC2292 socket option
2573 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2574 struct ucred *cred, int sticky, int cmsg, int uproto)
2576 int minmtupolicy, preftemp;
2579 if (!sticky && !cmsg) {
2581 printf("ip6_setpktopt: impossible case\n");
2587 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2588 * not be specified in the context of RFC3542. Conversely,
2589 * RFC3542 types should not be specified in the context of RFC2292.
2593 case IPV6_2292PKTINFO:
2594 case IPV6_2292HOPLIMIT:
2595 case IPV6_2292NEXTHOP:
2596 case IPV6_2292HOPOPTS:
2597 case IPV6_2292DSTOPTS:
2598 case IPV6_2292RTHDR:
2599 case IPV6_2292PKTOPTIONS:
2600 return (ENOPROTOOPT);
2603 if (sticky && cmsg) {
2610 case IPV6_RTHDRDSTOPTS:
2612 case IPV6_USE_MIN_MTU:
2615 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2616 return (ENOPROTOOPT);
2621 case IPV6_2292PKTINFO:
2624 struct ifnet *ifp = NULL;
2625 struct in6_pktinfo *pktinfo;
2627 if (len != sizeof(struct in6_pktinfo))
2630 pktinfo = (struct in6_pktinfo *)buf;
2633 * An application can clear any sticky IPV6_PKTINFO option by
2634 * doing a "regular" setsockopt with ipi6_addr being
2635 * in6addr_any and ipi6_ifindex being zero.
2636 * [RFC 3542, Section 6]
2638 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2639 pktinfo->ipi6_ifindex == 0 &&
2640 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2641 ip6_clearpktopts(opt, optname);
2645 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2646 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2650 /* validate the interface index if specified. */
2651 if (pktinfo->ipi6_ifindex > V_if_index ||
2652 pktinfo->ipi6_ifindex < 0) {
2655 if (pktinfo->ipi6_ifindex) {
2656 ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2662 * We store the address anyway, and let in6_selectsrc()
2663 * validate the specified address. This is because ipi6_addr
2664 * may not have enough information about its scope zone, and
2665 * we may need additional information (such as outgoing
2666 * interface or the scope zone of a destination address) to
2667 * disambiguate the scope.
2668 * XXX: the delay of the validation may confuse the
2669 * application when it is used as a sticky option.
2671 if (opt->ip6po_pktinfo == NULL) {
2672 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2673 M_IP6OPT, M_NOWAIT);
2674 if (opt->ip6po_pktinfo == NULL)
2677 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2681 case IPV6_2292HOPLIMIT:
2687 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2688 * to simplify the ordering among hoplimit options.
2690 if (optname == IPV6_HOPLIMIT && sticky)
2691 return (ENOPROTOOPT);
2693 if (len != sizeof(int))
2696 if (*hlimp < -1 || *hlimp > 255)
2699 opt->ip6po_hlim = *hlimp;
2707 if (len != sizeof(int))
2709 tclass = *(int *)buf;
2710 if (tclass < -1 || tclass > 255)
2713 opt->ip6po_tclass = tclass;
2717 case IPV6_2292NEXTHOP:
2720 error = priv_check_cred(cred,
2721 PRIV_NETINET_SETHDROPTS, 0);
2726 if (len == 0) { /* just remove the option */
2727 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2731 /* check if cmsg_len is large enough for sa_len */
2732 if (len < sizeof(struct sockaddr) || len < *buf)
2735 switch (((struct sockaddr *)buf)->sa_family) {
2738 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
2741 if (sa6->sin6_len != sizeof(struct sockaddr_in6))
2744 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
2745 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
2748 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
2754 case AF_LINK: /* should eventually be supported */
2756 return (EAFNOSUPPORT);
2759 /* turn off the previous option, then set the new option. */
2760 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2761 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
2762 if (opt->ip6po_nexthop == NULL)
2764 bcopy(buf, opt->ip6po_nexthop, *buf);
2767 case IPV6_2292HOPOPTS:
2770 struct ip6_hbh *hbh;
2774 * XXX: We don't allow a non-privileged user to set ANY HbH
2775 * options, since per-option restriction has too much
2779 error = priv_check_cred(cred,
2780 PRIV_NETINET_SETHDROPTS, 0);
2786 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2787 break; /* just remove the option */
2790 /* message length validation */
2791 if (len < sizeof(struct ip6_hbh))
2793 hbh = (struct ip6_hbh *)buf;
2794 hbhlen = (hbh->ip6h_len + 1) << 3;
2798 /* turn off the previous option, then set the new option. */
2799 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2800 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
2801 if (opt->ip6po_hbh == NULL)
2803 bcopy(hbh, opt->ip6po_hbh, hbhlen);
2808 case IPV6_2292DSTOPTS:
2810 case IPV6_RTHDRDSTOPTS:
2812 struct ip6_dest *dest, **newdest = NULL;
2815 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
2816 error = priv_check_cred(cred,
2817 PRIV_NETINET_SETHDROPTS, 0);
2823 ip6_clearpktopts(opt, optname);
2824 break; /* just remove the option */
2827 /* message length validation */
2828 if (len < sizeof(struct ip6_dest))
2830 dest = (struct ip6_dest *)buf;
2831 destlen = (dest->ip6d_len + 1) << 3;
2836 * Determine the position that the destination options header
2837 * should be inserted; before or after the routing header.
2840 case IPV6_2292DSTOPTS:
2842 * The old advacned API is ambiguous on this point.
2843 * Our approach is to determine the position based
2844 * according to the existence of a routing header.
2845 * Note, however, that this depends on the order of the
2846 * extension headers in the ancillary data; the 1st
2847 * part of the destination options header must appear
2848 * before the routing header in the ancillary data,
2850 * RFC3542 solved the ambiguity by introducing
2851 * separate ancillary data or option types.
2853 if (opt->ip6po_rthdr == NULL)
2854 newdest = &opt->ip6po_dest1;
2856 newdest = &opt->ip6po_dest2;
2858 case IPV6_RTHDRDSTOPTS:
2859 newdest = &opt->ip6po_dest1;
2862 newdest = &opt->ip6po_dest2;
2866 /* turn off the previous option, then set the new option. */
2867 ip6_clearpktopts(opt, optname);
2868 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
2869 if (*newdest == NULL)
2871 bcopy(dest, *newdest, destlen);
2876 case IPV6_2292RTHDR:
2879 struct ip6_rthdr *rth;
2883 ip6_clearpktopts(opt, IPV6_RTHDR);
2884 break; /* just remove the option */
2887 /* message length validation */
2888 if (len < sizeof(struct ip6_rthdr))
2890 rth = (struct ip6_rthdr *)buf;
2891 rthlen = (rth->ip6r_len + 1) << 3;
2895 switch (rth->ip6r_type) {
2896 case IPV6_RTHDR_TYPE_0:
2897 if (rth->ip6r_len == 0) /* must contain one addr */
2899 if (rth->ip6r_len % 2) /* length must be even */
2901 if (rth->ip6r_len / 2 != rth->ip6r_segleft)
2905 return (EINVAL); /* not supported */
2908 /* turn off the previous option */
2909 ip6_clearpktopts(opt, IPV6_RTHDR);
2910 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
2911 if (opt->ip6po_rthdr == NULL)
2913 bcopy(rth, opt->ip6po_rthdr, rthlen);
2918 case IPV6_USE_MIN_MTU:
2919 if (len != sizeof(int))
2921 minmtupolicy = *(int *)buf;
2922 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
2923 minmtupolicy != IP6PO_MINMTU_DISABLE &&
2924 minmtupolicy != IP6PO_MINMTU_ALL) {
2927 opt->ip6po_minmtu = minmtupolicy;
2931 if (len != sizeof(int))
2934 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
2936 * we ignore this option for TCP sockets.
2937 * (RFC3542 leaves this case unspecified.)
2939 opt->ip6po_flags &= ~IP6PO_DONTFRAG;
2941 opt->ip6po_flags |= IP6PO_DONTFRAG;
2944 case IPV6_PREFER_TEMPADDR:
2945 if (len != sizeof(int))
2947 preftemp = *(int *)buf;
2948 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
2949 preftemp != IP6PO_TEMPADDR_NOTPREFER &&
2950 preftemp != IP6PO_TEMPADDR_PREFER) {
2953 opt->ip6po_prefer_tempaddr = preftemp;
2957 return (ENOPROTOOPT);
2958 } /* end of switch */
2964 * Routine called from ip6_output() to loop back a copy of an IP6 multicast
2965 * packet to the input queue of a specified interface. Note that this
2966 * calls the output routine of the loopback "driver", but with an interface
2967 * pointer that might NOT be &loif -- easier than replicating that code here.
2970 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst)
2973 struct ip6_hdr *ip6;
2975 copym = m_copy(m, 0, M_COPYALL);
2980 * Make sure to deep-copy IPv6 header portion in case the data
2981 * is in an mbuf cluster, so that we can safely override the IPv6
2982 * header portion later.
2984 if ((copym->m_flags & M_EXT) != 0 ||
2985 copym->m_len < sizeof(struct ip6_hdr)) {
2986 copym = m_pullup(copym, sizeof(struct ip6_hdr));
2992 if (copym->m_len < sizeof(*ip6)) {
2998 ip6 = mtod(copym, struct ip6_hdr *);
3000 * clear embedded scope identifiers if necessary.
3001 * in6_clearscope will touch the addresses only when necessary.
3003 in6_clearscope(&ip6->ip6_src);
3004 in6_clearscope(&ip6->ip6_dst);
3006 (void)if_simloop(ifp, copym, dst->sin6_family, 0);
3010 * Chop IPv6 header off from the payload.
3013 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
3016 struct ip6_hdr *ip6;
3018 ip6 = mtod(m, struct ip6_hdr *);
3019 if (m->m_len > sizeof(*ip6)) {
3020 mh = m_gethdr(M_NOWAIT, MT_DATA);
3025 m_move_pkthdr(mh, m);
3026 MH_ALIGN(mh, sizeof(*ip6));
3027 m->m_len -= sizeof(*ip6);
3028 m->m_data += sizeof(*ip6);
3031 m->m_len = sizeof(*ip6);
3032 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
3034 exthdrs->ip6e_ip6 = m;
3039 * Compute IPv6 extension header length.
3042 ip6_optlen(struct inpcb *in6p)
3046 if (!in6p->in6p_outputopts)
3051 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
3053 len += elen(in6p->in6p_outputopts->ip6po_hbh);
3054 if (in6p->in6p_outputopts->ip6po_rthdr)
3055 /* dest1 is valid with rthdr only */
3056 len += elen(in6p->in6p_outputopts->ip6po_dest1);
3057 len += elen(in6p->in6p_outputopts->ip6po_rthdr);
3058 len += elen(in6p->in6p_outputopts->ip6po_dest2);