2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $
35 * Copyright (c) 1982, 1986, 1988, 1990, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
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52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
65 #include <sys/cdefs.h>
66 __FBSDID("$FreeBSD$");
69 #include "opt_inet6.h"
70 #include "opt_ratelimit.h"
71 #include "opt_ipsec.h"
73 #include "opt_route.h"
76 #include <sys/param.h>
77 #include <sys/kernel.h>
78 #include <sys/malloc.h>
80 #include <sys/errno.h>
83 #include <sys/protosw.h>
84 #include <sys/socket.h>
85 #include <sys/socketvar.h>
86 #include <sys/syslog.h>
87 #include <sys/ucred.h>
89 #include <machine/in_cksum.h>
92 #include <net/if_var.h>
93 #include <net/if_llatbl.h>
94 #include <net/netisr.h>
95 #include <net/route.h>
97 #include <net/rss_config.h>
100 #include <netinet/in.h>
101 #include <netinet/in_var.h>
102 #include <netinet/ip_var.h>
103 #include <netinet6/in6_fib.h>
104 #include <netinet6/in6_var.h>
105 #include <netinet/ip6.h>
106 #include <netinet/icmp6.h>
107 #include <netinet6/ip6_var.h>
108 #include <netinet/in_pcb.h>
109 #include <netinet/tcp_var.h>
110 #include <netinet6/nd6.h>
111 #include <netinet6/in6_rss.h>
113 #include <netipsec/ipsec_support.h>
115 #include <netinet/sctp.h>
116 #include <netinet/sctp_crc32.h>
119 #include <netinet6/ip6protosw.h>
120 #include <netinet6/scope6_var.h>
122 extern int in6_mcast_loop;
125 struct mbuf *ip6e_ip6;
126 struct mbuf *ip6e_hbh;
127 struct mbuf *ip6e_dest1;
128 struct mbuf *ip6e_rthdr;
129 struct mbuf *ip6e_dest2;
132 static MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
134 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **,
135 struct ucred *, int);
136 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *,
137 struct socket *, struct sockopt *);
138 static int ip6_getpcbopt(struct inpcb *, int, struct sockopt *);
139 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *,
140 struct ucred *, int, int, int);
142 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
143 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
145 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
146 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
147 static int ip6_getpmtu(struct route_in6 *, int,
148 struct ifnet *, const struct in6_addr *, u_long *, int *, u_int,
150 static int ip6_calcmtu(struct ifnet *, const struct in6_addr *, u_long,
151 u_long *, int *, u_int);
152 static int ip6_getpmtu_ctl(u_int, const struct in6_addr *, u_long *);
153 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
157 * Make an extension header from option data. hp is the source, and
158 * mp is the destination.
160 #define MAKE_EXTHDR(hp, mp) \
163 struct ip6_ext *eh = (struct ip6_ext *)(hp); \
164 error = ip6_copyexthdr((mp), (caddr_t)(hp), \
165 ((eh)->ip6e_len + 1) << 3); \
169 } while (/*CONSTCOND*/ 0)
172 * Form a chain of extension headers.
173 * m is the extension header mbuf
174 * mp is the previous mbuf in the chain
175 * p is the next header
176 * i is the type of option.
178 #define MAKE_CHAIN(m, mp, p, i)\
182 panic("assumption failed: hdr not split"); \
183 *mtod((m), u_char *) = *(p);\
185 p = mtod((m), u_char *);\
186 (m)->m_next = (mp)->m_next;\
190 } while (/*CONSTCOND*/ 0)
193 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
197 csum = in_cksum_skip(m, offset + plen, offset);
198 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
200 offset += m->m_pkthdr.csum_data; /* checksum offset */
202 if (offset + sizeof(u_short) > m->m_len) {
203 printf("%s: delayed m_pullup, m->len: %d plen %u off %u "
204 "csum_flags=%b\n", __func__, m->m_len, plen, offset,
205 (int)m->m_pkthdr.csum_flags, CSUM_BITS);
207 * XXX this should not happen, but if it does, the correct
208 * behavior may be to insert the checksum in the appropriate
209 * next mbuf in the chain.
213 *(u_short *)(m->m_data + offset) = csum;
217 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto,
218 int fraglen , uint32_t id)
220 struct mbuf *m, **mnext, *m_frgpart;
221 struct ip6_hdr *ip6, *mhip6;
222 struct ip6_frag *ip6f;
225 int tlen = m0->m_pkthdr.len;
227 KASSERT((fraglen % 8 == 0), ("Fragment length must be a multiple of 8"));
230 ip6 = mtod(m, struct ip6_hdr *);
231 mnext = &m->m_nextpkt;
233 for (off = hlen; off < tlen; off += fraglen) {
234 m = m_gethdr(M_NOWAIT, MT_DATA);
236 IP6STAT_INC(ip6s_odropped);
239 m->m_flags = m0->m_flags & M_COPYFLAGS;
241 mnext = &m->m_nextpkt;
242 m->m_data += max_linkhdr;
243 mhip6 = mtod(m, struct ip6_hdr *);
245 m->m_len = sizeof(*mhip6);
246 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
248 IP6STAT_INC(ip6s_odropped);
251 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
252 if (off + fraglen >= tlen)
253 fraglen = tlen - off;
255 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
256 mhip6->ip6_plen = htons((u_short)(fraglen + hlen +
257 sizeof(*ip6f) - sizeof(struct ip6_hdr)));
258 if ((m_frgpart = m_copym(m0, off, fraglen, M_NOWAIT)) == NULL) {
259 IP6STAT_INC(ip6s_odropped);
263 m->m_pkthdr.len = fraglen + hlen + sizeof(*ip6f);
264 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum;
265 m->m_pkthdr.rcvif = NULL;
266 ip6f->ip6f_reserved = 0;
267 ip6f->ip6f_ident = id;
268 ip6f->ip6f_nxt = nextproto;
269 IP6STAT_INC(ip6s_ofragments);
270 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
277 * IP6 output. The packet in mbuf chain m contains a skeletal IP6
278 * header (with pri, len, nxt, hlim, src, dst).
279 * This function may modify ver and hlim only.
280 * The mbuf chain containing the packet will be freed.
281 * The mbuf opt, if present, will not be freed.
282 * If route_in6 ro is present and has ro_rt initialized, route lookup would be
283 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
284 * then result of route lookup is stored in ro->ro_rt.
286 * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and
287 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one,
290 * ifpp - XXX: just for statistics
293 * XXX TODO: no flowid is assigned for outbound flows?
296 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
297 struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
298 struct ifnet **ifpp, struct inpcb *inp)
301 struct ifnet *ifp, *origifp;
303 struct mbuf *mprev = NULL;
305 struct route_in6 ip6route;
306 struct rtentry *rt = NULL;
307 struct sockaddr_in6 *dst, src_sa, dst_sa;
308 struct in6_addr odst;
310 struct in6_ifaddr *ia = NULL;
312 int alwaysfrag, dontfrag;
313 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
314 struct ip6_exthdrs exthdrs;
315 struct in6_addr src0, dst0;
317 struct route_in6 *ro_pmtu = NULL;
322 struct m_tag *fwd_tag = NULL;
326 INP_LOCK_ASSERT(inp);
327 M_SETFIB(m, inp->inp_inc.inc_fibnum);
328 if ((flags & IP_NODEFAULTFLOWID) == 0) {
329 /* unconditionally set flowid */
330 m->m_pkthdr.flowid = inp->inp_flowid;
331 M_HASHTYPE_SET(m, inp->inp_flowtype);
335 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
337 * IPSec checking which handles several cases.
338 * FAST IPSEC: We re-injected the packet.
339 * XXX: need scope argument.
341 if (IPSEC_ENABLED(ipv6)) {
342 if ((error = IPSEC_OUTPUT(ipv6, m, inp)) != 0) {
343 if (error == EINPROGRESS)
350 bzero(&exthdrs, sizeof(exthdrs));
352 /* Hop-by-Hop options header */
353 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
354 /* Destination options header(1st part) */
355 if (opt->ip6po_rthdr) {
357 * Destination options header(1st part)
358 * This only makes sense with a routing header.
359 * See Section 9.2 of RFC 3542.
360 * Disabling this part just for MIP6 convenience is
361 * a bad idea. We need to think carefully about a
362 * way to make the advanced API coexist with MIP6
363 * options, which might automatically be inserted in
366 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
369 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
370 /* Destination options header(2nd part) */
371 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
375 * Calculate the total length of the extension header chain.
376 * Keep the length of the unfragmentable part for fragmentation.
379 if (exthdrs.ip6e_hbh)
380 optlen += exthdrs.ip6e_hbh->m_len;
381 if (exthdrs.ip6e_dest1)
382 optlen += exthdrs.ip6e_dest1->m_len;
383 if (exthdrs.ip6e_rthdr)
384 optlen += exthdrs.ip6e_rthdr->m_len;
385 unfragpartlen = optlen + sizeof(struct ip6_hdr);
387 /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */
388 if (exthdrs.ip6e_dest2)
389 optlen += exthdrs.ip6e_dest2->m_len;
392 * If there is at least one extension header,
393 * separate IP6 header from the payload.
395 if (optlen && !hdrsplit) {
396 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
400 m = exthdrs.ip6e_ip6;
404 ip6 = mtod(m, struct ip6_hdr *);
406 /* adjust mbuf packet header length */
407 m->m_pkthdr.len += optlen;
408 plen = m->m_pkthdr.len - sizeof(*ip6);
410 /* If this is a jumbo payload, insert a jumbo payload option. */
411 if (plen > IPV6_MAXPACKET) {
413 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
417 m = exthdrs.ip6e_ip6;
421 ip6 = mtod(m, struct ip6_hdr *);
422 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
426 ip6->ip6_plen = htons(plen);
429 * Concatenate headers and fill in next header fields.
430 * Here we have, on "m"
432 * and we insert headers accordingly. Finally, we should be getting:
433 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
435 * during the header composing process, "m" points to IPv6 header.
436 * "mprev" points to an extension header prior to esp.
438 u_char *nexthdrp = &ip6->ip6_nxt;
442 * we treat dest2 specially. this makes IPsec processing
443 * much easier. the goal here is to make mprev point the
444 * mbuf prior to dest2.
446 * result: IPv6 dest2 payload
447 * m and mprev will point to IPv6 header.
449 if (exthdrs.ip6e_dest2) {
451 panic("assumption failed: hdr not split");
452 exthdrs.ip6e_dest2->m_next = m->m_next;
453 m->m_next = exthdrs.ip6e_dest2;
454 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
455 ip6->ip6_nxt = IPPROTO_DSTOPTS;
459 * result: IPv6 hbh dest1 rthdr dest2 payload
460 * m will point to IPv6 header. mprev will point to the
461 * extension header prior to dest2 (rthdr in the above case).
463 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
464 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
466 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
470 * If there is a routing header, discard the packet.
472 if (exthdrs.ip6e_rthdr) {
477 /* Source address validation */
478 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
479 (flags & IPV6_UNSPECSRC) == 0) {
481 IP6STAT_INC(ip6s_badscope);
484 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
486 IP6STAT_INC(ip6s_badscope);
490 IP6STAT_INC(ip6s_localout);
497 bzero((caddr_t)ro, sizeof(*ro));
500 if (opt && opt->ip6po_rthdr)
501 ro = &opt->ip6po_route;
502 dst = (struct sockaddr_in6 *)&ro->ro_dst;
503 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
506 * if specified, try to fill in the traffic class field.
507 * do not override if a non-zero value is already set.
508 * we check the diffserv field and the ecn field separately.
510 if (opt && opt->ip6po_tclass >= 0) {
513 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
515 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
518 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
521 /* fill in or override the hop limit field, if necessary. */
522 if (opt && opt->ip6po_hlim != -1)
523 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
524 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
526 ip6->ip6_hlim = im6o->im6o_multicast_hlim;
528 ip6->ip6_hlim = V_ip6_defmcasthlim;
531 * Validate route against routing table additions;
532 * a better/more specific route might have been added.
533 * Make sure address family is set in route.
536 ro->ro_dst.sin6_family = AF_INET6;
537 RT_VALIDATE((struct route *)ro, &inp->inp_rt_cookie, fibnum);
539 if (ro->ro_rt && fwd_tag == NULL && (ro->ro_rt->rt_flags & RTF_UP) &&
540 ro->ro_dst.sin6_family == AF_INET6 &&
541 IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)) {
543 ifp = ro->ro_rt->rt_ifp;
546 LLE_FREE(ro->ro_lle); /* zeros ro_lle */
548 if (fwd_tag == NULL) {
549 bzero(&dst_sa, sizeof(dst_sa));
550 dst_sa.sin6_family = AF_INET6;
551 dst_sa.sin6_len = sizeof(dst_sa);
552 dst_sa.sin6_addr = ip6->ip6_dst;
554 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp,
558 in6_ifstat_inc(ifp, ifs6_out_discard);
564 * If in6_selectroute() does not return a route entry,
565 * dst may not have been updated.
567 *dst = dst_sa; /* XXX */
571 * then rt (for unicast) and ifp must be non-NULL valid values.
573 if ((flags & IPV6_FORWARDING) == 0) {
574 /* XXX: the FORWARDING flag can be set for mrouting. */
575 in6_ifstat_inc(ifp, ifs6_out_request);
578 ia = (struct in6_ifaddr *)(rt->rt_ifa);
579 counter_u64_add(rt->rt_pksent, 1);
584 * The outgoing interface must be in the zone of source and
585 * destination addresses.
590 if (in6_setscope(&src0, origifp, &zone))
592 bzero(&src_sa, sizeof(src_sa));
593 src_sa.sin6_family = AF_INET6;
594 src_sa.sin6_len = sizeof(src_sa);
595 src_sa.sin6_addr = ip6->ip6_src;
596 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
600 if (in6_setscope(&dst0, origifp, &zone))
602 /* re-initialize to be sure */
603 bzero(&dst_sa, sizeof(dst_sa));
604 dst_sa.sin6_family = AF_INET6;
605 dst_sa.sin6_len = sizeof(dst_sa);
606 dst_sa.sin6_addr = ip6->ip6_dst;
607 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) {
611 /* We should use ia_ifp to support the case of
612 * sending packets to an address of our own.
614 if (ia != NULL && ia->ia_ifp)
617 /* scope check is done. */
621 IP6STAT_INC(ip6s_badscope);
622 in6_ifstat_inc(origifp, ifs6_out_discard);
624 error = EHOSTUNREACH; /* XXX */
628 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
629 if (opt && opt->ip6po_nextroute.ro_rt) {
631 * The nexthop is explicitly specified by the
632 * application. We assume the next hop is an IPv6
635 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
637 else if ((rt->rt_flags & RTF_GATEWAY))
638 dst = (struct sockaddr_in6 *)rt->rt_gateway;
641 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
642 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
644 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
645 in6_ifstat_inc(ifp, ifs6_out_mcast);
647 * Confirm that the outgoing interface supports multicast.
649 if (!(ifp->if_flags & IFF_MULTICAST)) {
650 IP6STAT_INC(ip6s_noroute);
651 in6_ifstat_inc(ifp, ifs6_out_discard);
655 if ((im6o == NULL && in6_mcast_loop) ||
656 (im6o && im6o->im6o_multicast_loop)) {
658 * Loop back multicast datagram if not expressly
659 * forbidden to do so, even if we have not joined
660 * the address; protocols will filter it later,
661 * thus deferring a hash lookup and lock acquisition
662 * at the expense of an m_copym().
664 ip6_mloopback(ifp, m);
667 * If we are acting as a multicast router, perform
668 * multicast forwarding as if the packet had just
669 * arrived on the interface to which we are about
670 * to send. The multicast forwarding function
671 * recursively calls this function, using the
672 * IPV6_FORWARDING flag to prevent infinite recursion.
674 * Multicasts that are looped back by ip6_mloopback(),
675 * above, will be forwarded by the ip6_input() routine,
678 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
680 * XXX: ip6_mforward expects that rcvif is NULL
681 * when it is called from the originating path.
682 * However, it may not always be the case.
684 m->m_pkthdr.rcvif = NULL;
685 if (ip6_mforward(ip6, ifp, m) != 0) {
692 * Multicasts with a hoplimit of zero may be looped back,
693 * above, but must not be transmitted on a network.
694 * Also, multicasts addressed to the loopback interface
695 * are not sent -- the above call to ip6_mloopback() will
696 * loop back a copy if this host actually belongs to the
697 * destination group on the loopback interface.
699 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
700 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
707 * Fill the outgoing inteface to tell the upper layer
708 * to increment per-interface statistics.
713 /* Determine path MTU. */
714 if ((error = ip6_getpmtu(ro_pmtu, ro != ro_pmtu, ifp, &ip6->ip6_dst,
715 &mtu, &alwaysfrag, fibnum, *nexthdrp)) != 0)
719 * The caller of this function may specify to use the minimum MTU
721 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
722 * setting. The logic is a bit complicated; by default, unicast
723 * packets will follow path MTU while multicast packets will be sent at
724 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
725 * including unicast ones will be sent at the minimum MTU. Multicast
726 * packets will always be sent at the minimum MTU unless
727 * IP6PO_MINMTU_DISABLE is explicitly specified.
728 * See RFC 3542 for more details.
730 if (mtu > IPV6_MMTU) {
731 if ((flags & IPV6_MINMTU))
733 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
735 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
737 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
743 * clear embedded scope identifiers if necessary.
744 * in6_clearscope will touch the addresses only when necessary.
746 in6_clearscope(&ip6->ip6_src);
747 in6_clearscope(&ip6->ip6_dst);
750 * If the outgoing packet contains a hop-by-hop options header,
751 * it must be examined and processed even by the source node.
752 * (RFC 2460, section 4.)
754 if (exthdrs.ip6e_hbh) {
755 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
756 u_int32_t dummy; /* XXX unused */
757 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
760 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
761 panic("ip6e_hbh is not contiguous");
764 * XXX: if we have to send an ICMPv6 error to the sender,
765 * we need the M_LOOP flag since icmp6_error() expects
766 * the IPv6 and the hop-by-hop options header are
767 * contiguous unless the flag is set.
769 m->m_flags |= M_LOOP;
770 m->m_pkthdr.rcvif = ifp;
771 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
772 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
773 &dummy, &plen) < 0) {
774 /* m was already freed at this point */
775 error = EINVAL;/* better error? */
778 m->m_flags &= ~M_LOOP; /* XXX */
779 m->m_pkthdr.rcvif = NULL;
782 /* Jump over all PFIL processing if hooks are not active. */
783 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
787 /* Run through list of hooks for output packets. */
788 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, 0, inp);
789 if (error != 0 || m == NULL)
792 ip6 = mtod(m, struct ip6_hdr *);
795 /* See if destination IP address was changed by packet filter. */
796 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
797 m->m_flags |= M_SKIP_FIREWALL;
798 /* If destination is now ourself drop to ip6_input(). */
799 if (in6_localip(&ip6->ip6_dst)) {
800 m->m_flags |= M_FASTFWD_OURS;
801 if (m->m_pkthdr.rcvif == NULL)
802 m->m_pkthdr.rcvif = V_loif;
803 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
804 m->m_pkthdr.csum_flags |=
805 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
806 m->m_pkthdr.csum_data = 0xffff;
809 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
810 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
812 error = netisr_queue(NETISR_IPV6, m);
816 needfiblookup = 1; /* Redo the routing table lookup. */
818 LLE_FREE(ro->ro_lle); /* zeros ro_lle */
822 /* See if fib was changed by packet filter. */
823 if (fibnum != M_GETFIB(m)) {
824 m->m_flags |= M_SKIP_FIREWALL;
825 fibnum = M_GETFIB(m);
829 LLE_FREE(ro->ro_lle); /* zeros ro_lle */
835 /* See if local, if yes, send it to netisr. */
836 if (m->m_flags & M_FASTFWD_OURS) {
837 if (m->m_pkthdr.rcvif == NULL)
838 m->m_pkthdr.rcvif = V_loif;
839 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
840 m->m_pkthdr.csum_flags |=
841 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
842 m->m_pkthdr.csum_data = 0xffff;
845 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
846 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
848 error = netisr_queue(NETISR_IPV6, m);
851 /* Or forward to some other address? */
852 if ((m->m_flags & M_IP6_NEXTHOP) &&
853 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
854 dst = (struct sockaddr_in6 *)&ro->ro_dst;
855 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
856 m->m_flags |= M_SKIP_FIREWALL;
857 m->m_flags &= ~M_IP6_NEXTHOP;
858 m_tag_delete(m, fwd_tag);
864 * Send the packet to the outgoing interface.
865 * If necessary, do IPv6 fragmentation before sending.
867 * the logic here is rather complex:
868 * 1: normal case (dontfrag == 0, alwaysfrag == 0)
869 * 1-a: send as is if tlen <= path mtu
870 * 1-b: fragment if tlen > path mtu
872 * 2: if user asks us not to fragment (dontfrag == 1)
873 * 2-a: send as is if tlen <= interface mtu
874 * 2-b: error if tlen > interface mtu
876 * 3: if we always need to attach fragment header (alwaysfrag == 1)
879 * 4: if dontfrag == 1 && alwaysfrag == 1
880 * error, as we cannot handle this conflicting request
882 sw_csum = m->m_pkthdr.csum_flags;
884 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0;
885 sw_csum &= ~ifp->if_hwassist;
889 * If we added extension headers, we will not do TSO and calculate the
890 * checksums ourselves for now.
891 * XXX-BZ Need a framework to know when the NIC can handle it, even
894 if (sw_csum & CSUM_DELAY_DATA_IPV6) {
895 sw_csum &= ~CSUM_DELAY_DATA_IPV6;
896 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
899 if (sw_csum & CSUM_SCTP_IPV6) {
900 sw_csum &= ~CSUM_SCTP_IPV6;
901 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
904 m->m_pkthdr.csum_flags &= ifp->if_hwassist;
905 tlen = m->m_pkthdr.len;
907 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
911 if (dontfrag && alwaysfrag) { /* case 4 */
912 /* conflicting request - can't transmit */
916 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */
918 * Even if the DONTFRAG option is specified, we cannot send the
919 * packet when the data length is larger than the MTU of the
920 * outgoing interface.
921 * Notify the error by sending IPV6_PATHMTU ancillary data if
922 * application wanted to know the MTU value. Also return an
923 * error code (this is not described in the API spec).
926 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu);
932 * transmit packet without fragmentation
934 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
935 struct in6_ifaddr *ia6;
937 ip6 = mtod(m, struct ip6_hdr *);
938 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
940 /* Record statistics for this interface address. */
941 counter_u64_add(ia6->ia_ifa.ifa_opackets, 1);
942 counter_u64_add(ia6->ia_ifa.ifa_obytes,
944 ifa_free(&ia6->ia_ifa);
948 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
949 in_pcboutput_txrtlmt(inp, ifp, m);
950 /* stamp send tag on mbuf */
951 m->m_pkthdr.snd_tag = inp->inp_snd_tag;
953 m->m_pkthdr.snd_tag = NULL;
956 error = nd6_output_ifp(ifp, origifp, m, dst,
959 /* check for route change */
961 in_pcboutput_eagain(inp);
967 * try to fragment the packet. case 1-b and 3
969 if (mtu < IPV6_MMTU) {
970 /* path MTU cannot be less than IPV6_MMTU */
972 in6_ifstat_inc(ifp, ifs6_out_fragfail);
974 } else if (ip6->ip6_plen == 0) {
975 /* jumbo payload cannot be fragmented */
977 in6_ifstat_inc(ifp, ifs6_out_fragfail);
983 * Too large for the destination or interface;
984 * fragment if possible.
985 * Must be able to put at least 8 bytes per fragment.
987 hlen = unfragpartlen;
988 if (mtu > IPV6_MAXPACKET)
989 mtu = IPV6_MAXPACKET;
991 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
994 in6_ifstat_inc(ifp, ifs6_out_fragfail);
999 * If the interface will not calculate checksums on
1000 * fragmented packets, then do it here.
1001 * XXX-BZ handle the hw offloading case. Need flags.
1003 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1004 in6_delayed_cksum(m, plen, hlen);
1005 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
1008 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
1009 sctp_delayed_cksum(m, hlen);
1010 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
1014 * Change the next header field of the last header in the
1015 * unfragmentable part.
1017 if (exthdrs.ip6e_rthdr) {
1018 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
1019 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
1020 } else if (exthdrs.ip6e_dest1) {
1021 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
1022 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
1023 } else if (exthdrs.ip6e_hbh) {
1024 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
1025 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
1027 nextproto = ip6->ip6_nxt;
1028 ip6->ip6_nxt = IPPROTO_FRAGMENT;
1032 * Loop through length of segment after first fragment,
1033 * make new header and copy data of each part and link onto
1037 id = htonl(ip6_randomid());
1038 if ((error = ip6_fragment(ifp, m, hlen, nextproto, len, id)))
1041 in6_ifstat_inc(ifp, ifs6_out_fragok);
1045 * Remove leading garbages.
1055 /* Record statistics for this interface address. */
1057 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
1058 counter_u64_add(ia->ia_ifa.ifa_obytes,
1063 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
1064 in_pcboutput_txrtlmt(inp, ifp, m);
1065 /* stamp send tag on mbuf */
1066 m->m_pkthdr.snd_tag = inp->inp_snd_tag;
1068 m->m_pkthdr.snd_tag = NULL;
1071 error = nd6_output_ifp(ifp, origifp, m, dst,
1072 (struct route *)ro);
1074 /* check for route change */
1075 if (error == EAGAIN)
1076 in_pcboutput_eagain(inp);
1083 IP6STAT_INC(ip6s_fragmented);
1086 if (ro == &ip6route)
1091 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */
1092 m_freem(exthdrs.ip6e_dest1);
1093 m_freem(exthdrs.ip6e_rthdr);
1094 m_freem(exthdrs.ip6e_dest2);
1103 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1107 if (hlen > MCLBYTES)
1108 return (ENOBUFS); /* XXX */
1111 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1113 m = m_get(M_NOWAIT, MT_DATA);
1118 bcopy(hdr, mtod(m, caddr_t), hlen);
1125 * Insert jumbo payload option.
1128 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1134 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */
1137 * If there is no hop-by-hop options header, allocate new one.
1138 * If there is one but it doesn't have enough space to store the
1139 * jumbo payload option, allocate a cluster to store the whole options.
1140 * Otherwise, use it to store the options.
1142 if (exthdrs->ip6e_hbh == NULL) {
1143 mopt = m_get(M_NOWAIT, MT_DATA);
1146 mopt->m_len = JUMBOOPTLEN;
1147 optbuf = mtod(mopt, u_char *);
1148 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */
1149 exthdrs->ip6e_hbh = mopt;
1151 struct ip6_hbh *hbh;
1153 mopt = exthdrs->ip6e_hbh;
1154 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1157 * - exthdrs->ip6e_hbh is not referenced from places
1158 * other than exthdrs.
1159 * - exthdrs->ip6e_hbh is not an mbuf chain.
1161 int oldoptlen = mopt->m_len;
1165 * XXX: give up if the whole (new) hbh header does
1166 * not fit even in an mbuf cluster.
1168 if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1172 * As a consequence, we must always prepare a cluster
1175 n = m_getcl(M_NOWAIT, MT_DATA, 0);
1178 n->m_len = oldoptlen + JUMBOOPTLEN;
1179 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
1181 optbuf = mtod(n, caddr_t) + oldoptlen;
1183 mopt = exthdrs->ip6e_hbh = n;
1185 optbuf = mtod(mopt, u_char *) + mopt->m_len;
1186 mopt->m_len += JUMBOOPTLEN;
1188 optbuf[0] = IP6OPT_PADN;
1192 * Adjust the header length according to the pad and
1193 * the jumbo payload option.
1195 hbh = mtod(mopt, struct ip6_hbh *);
1196 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1199 /* fill in the option. */
1200 optbuf[2] = IP6OPT_JUMBO;
1202 v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1203 bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1205 /* finally, adjust the packet header length */
1206 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1213 * Insert fragment header and copy unfragmentable header portions.
1216 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1217 struct ip6_frag **frghdrp)
1219 struct mbuf *n, *mlast;
1221 if (hlen > sizeof(struct ip6_hdr)) {
1222 n = m_copym(m0, sizeof(struct ip6_hdr),
1223 hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1230 /* Search for the last mbuf of unfragmentable part. */
1231 for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1234 if (M_WRITABLE(mlast) &&
1235 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1236 /* use the trailing space of the last mbuf for the fragment hdr */
1237 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1239 mlast->m_len += sizeof(struct ip6_frag);
1240 m->m_pkthdr.len += sizeof(struct ip6_frag);
1242 /* allocate a new mbuf for the fragment header */
1245 mfrg = m_get(M_NOWAIT, MT_DATA);
1248 mfrg->m_len = sizeof(struct ip6_frag);
1249 *frghdrp = mtod(mfrg, struct ip6_frag *);
1250 mlast->m_next = mfrg;
1257 * Calculates IPv6 path mtu for destination @dst.
1258 * Resulting MTU is stored in @mtup.
1260 * Returns 0 on success.
1263 ip6_getpmtu_ctl(u_int fibnum, const struct in6_addr *dst, u_long *mtup)
1265 struct nhop6_extended nh6;
1266 struct in6_addr kdst;
1272 in6_splitscope(dst, &kdst, &scopeid);
1273 if (fib6_lookup_nh_ext(fibnum, &kdst, scopeid, NHR_REF, 0, &nh6) != 0)
1274 return (EHOSTUNREACH);
1279 error = ip6_calcmtu(ifp, dst, mtu, mtup, NULL, 0);
1280 fib6_free_nh_ext(fibnum, &nh6);
1286 * Calculates IPv6 path MTU for @dst based on transmit @ifp,
1287 * and cached data in @ro_pmtu.
1288 * MTU from (successful) route lookup is saved (along with dst)
1289 * inside @ro_pmtu to avoid subsequent route lookups after packet
1290 * filter processing.
1292 * Stores mtu and always-frag value into @mtup and @alwaysfragp.
1293 * Returns 0 on success.
1296 ip6_getpmtu(struct route_in6 *ro_pmtu, int do_lookup,
1297 struct ifnet *ifp, const struct in6_addr *dst, u_long *mtup,
1298 int *alwaysfragp, u_int fibnum, u_int proto)
1300 struct nhop6_basic nh6;
1301 struct in6_addr kdst;
1303 struct sockaddr_in6 *sa6_dst;
1310 * Here ro_pmtu has final destination address, while
1311 * ro might represent immediate destination.
1312 * Use ro_pmtu destination since mtu might differ.
1314 sa6_dst = (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1315 if (!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))
1316 ro_pmtu->ro_mtu = 0;
1318 if (ro_pmtu->ro_mtu == 0) {
1319 bzero(sa6_dst, sizeof(*sa6_dst));
1320 sa6_dst->sin6_family = AF_INET6;
1321 sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1322 sa6_dst->sin6_addr = *dst;
1324 in6_splitscope(dst, &kdst, &scopeid);
1325 if (fib6_lookup_nh_basic(fibnum, &kdst, scopeid, 0, 0,
1327 ro_pmtu->ro_mtu = nh6.nh_mtu;
1330 mtu = ro_pmtu->ro_mtu;
1334 mtu = ro_pmtu->ro_rt->rt_mtu;
1336 return (ip6_calcmtu(ifp, dst, mtu, mtup, alwaysfragp, proto));
1340 * Calculate MTU based on transmit @ifp, route mtu @rt_mtu and
1341 * hostcache data for @dst.
1342 * Stores mtu and always-frag value into @mtup and @alwaysfragp.
1344 * Returns 0 on success.
1347 ip6_calcmtu(struct ifnet *ifp, const struct in6_addr *dst, u_long rt_mtu,
1348 u_long *mtup, int *alwaysfragp, u_int proto)
1356 struct in_conninfo inc;
1358 bzero(&inc, sizeof(inc));
1359 inc.inc_flags |= INC_ISIPV6;
1360 inc.inc6_faddr = *dst;
1362 ifmtu = IN6_LINKMTU(ifp);
1364 /* TCP is known to react to pmtu changes so skip hc */
1365 if (proto != IPPROTO_TCP)
1366 mtu = tcp_hc_getmtu(&inc);
1369 mtu = min(mtu, rt_mtu);
1374 else if (mtu < IPV6_MMTU) {
1376 * RFC2460 section 5, last paragraph:
1377 * if we record ICMPv6 too big message with
1378 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1379 * or smaller, with framgent header attached.
1380 * (fragment header is needed regardless from the
1381 * packet size, for translators to identify packets)
1387 mtu = IN6_LINKMTU(ifp);
1389 error = EHOSTUNREACH; /* XXX */
1393 *alwaysfragp = alwaysfrag;
1398 * IP6 socket option processing.
1401 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1403 int optdatalen, uproto;
1405 struct inpcb *in6p = sotoinpcb(so);
1407 int level, op, optname;
1411 uint32_t rss_bucket;
1416 * Don't use more than a quarter of mbuf clusters. N.B.:
1417 * nmbclusters is an int, but nmbclusters * MCLBYTES may overflow
1418 * on LP64 architectures, so cast to u_long to avoid undefined
1419 * behavior. ILP32 architectures cannot have nmbclusters
1420 * large enough to overflow for other reasons.
1422 #define IPV6_PKTOPTIONS_MBUF_LIMIT ((u_long)nmbclusters * MCLBYTES / 4)
1424 level = sopt->sopt_level;
1425 op = sopt->sopt_dir;
1426 optname = sopt->sopt_name;
1427 optlen = sopt->sopt_valsize;
1431 uproto = (int)so->so_proto->pr_protocol;
1433 if (level != IPPROTO_IPV6) {
1436 if (sopt->sopt_level == SOL_SOCKET &&
1437 sopt->sopt_dir == SOPT_SET) {
1438 switch (sopt->sopt_name) {
1441 if ((so->so_options & SO_REUSEADDR) != 0)
1442 in6p->inp_flags2 |= INP_REUSEADDR;
1444 in6p->inp_flags2 &= ~INP_REUSEADDR;
1450 if ((so->so_options & SO_REUSEPORT) != 0)
1451 in6p->inp_flags2 |= INP_REUSEPORT;
1453 in6p->inp_flags2 &= ~INP_REUSEPORT;
1459 in6p->inp_inc.inc_fibnum = so->so_fibnum;
1463 case SO_MAX_PACING_RATE:
1466 in6p->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1477 } else { /* level == IPPROTO_IPV6 */
1482 case IPV6_2292PKTOPTIONS:
1483 #ifdef IPV6_PKTOPTIONS
1484 case IPV6_PKTOPTIONS:
1489 if (optlen > IPV6_PKTOPTIONS_MBUF_LIMIT) {
1490 printf("ip6_ctloutput: mbuf limit hit\n");
1495 error = soopt_getm(sopt, &m); /* XXX */
1498 error = soopt_mcopyin(sopt, m); /* XXX */
1501 error = ip6_pcbopts(&in6p->in6p_outputopts,
1503 m_freem(m); /* XXX */
1508 * Use of some Hop-by-Hop options or some
1509 * Destination options, might require special
1510 * privilege. That is, normal applications
1511 * (without special privilege) might be forbidden
1512 * from setting certain options in outgoing packets,
1513 * and might never see certain options in received
1514 * packets. [RFC 2292 Section 6]
1515 * KAME specific note:
1516 * KAME prevents non-privileged users from sending or
1517 * receiving ANY hbh/dst options in order to avoid
1518 * overhead of parsing options in the kernel.
1520 case IPV6_RECVHOPOPTS:
1521 case IPV6_RECVDSTOPTS:
1522 case IPV6_RECVRTHDRDSTOPTS:
1524 error = priv_check(td,
1525 PRIV_NETINET_SETHDROPTS);
1530 case IPV6_UNICAST_HOPS:
1533 case IPV6_RECVPKTINFO:
1534 case IPV6_RECVHOPLIMIT:
1535 case IPV6_RECVRTHDR:
1536 case IPV6_RECVPATHMTU:
1537 case IPV6_RECVTCLASS:
1538 case IPV6_RECVFLOWID:
1540 case IPV6_RECVRSSBUCKETID:
1543 case IPV6_AUTOFLOWLABEL:
1544 case IPV6_ORIGDSTADDR:
1546 case IPV6_BINDMULTI:
1548 case IPV6_RSS_LISTEN_BUCKET:
1550 if (optname == IPV6_BINDANY && td != NULL) {
1551 error = priv_check(td,
1552 PRIV_NETINET_BINDANY);
1557 if (optlen != sizeof(int)) {
1561 error = sooptcopyin(sopt, &optval,
1562 sizeof optval, sizeof optval);
1567 case IPV6_UNICAST_HOPS:
1568 if (optval < -1 || optval >= 256)
1571 /* -1 = kernel default */
1572 in6p->in6p_hops = optval;
1573 if ((in6p->inp_vflag &
1575 in6p->inp_ip_ttl = optval;
1578 #define OPTSET(bit) \
1582 in6p->inp_flags |= (bit); \
1584 in6p->inp_flags &= ~(bit); \
1585 INP_WUNLOCK(in6p); \
1586 } while (/*CONSTCOND*/ 0)
1587 #define OPTSET2292(bit) \
1590 in6p->inp_flags |= IN6P_RFC2292; \
1592 in6p->inp_flags |= (bit); \
1594 in6p->inp_flags &= ~(bit); \
1595 INP_WUNLOCK(in6p); \
1596 } while (/*CONSTCOND*/ 0)
1597 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0)
1599 #define OPTSET2_N(bit, val) do { \
1601 in6p->inp_flags2 |= bit; \
1603 in6p->inp_flags2 &= ~bit; \
1605 #define OPTSET2(bit, val) do { \
1607 OPTSET2_N(bit, val); \
1608 INP_WUNLOCK(in6p); \
1610 #define OPTBIT2(bit) (in6p->inp_flags2 & (bit) ? 1 : 0)
1611 #define OPTSET2292_EXCLUSIVE(bit) \
1614 if (OPTBIT(IN6P_RFC2292)) { \
1618 in6p->inp_flags |= (bit); \
1620 in6p->inp_flags &= ~(bit); \
1622 INP_WUNLOCK(in6p); \
1623 } while (/*CONSTCOND*/ 0)
1625 case IPV6_RECVPKTINFO:
1626 OPTSET2292_EXCLUSIVE(IN6P_PKTINFO);
1631 struct ip6_pktopts **optp;
1633 /* cannot mix with RFC2292 */
1634 if (OPTBIT(IN6P_RFC2292)) {
1638 optp = &in6p->in6p_outputopts;
1639 error = ip6_pcbopt(IPV6_HOPLIMIT,
1640 (u_char *)&optval, sizeof(optval),
1641 optp, (td != NULL) ? td->td_ucred :
1646 case IPV6_RECVHOPLIMIT:
1647 OPTSET2292_EXCLUSIVE(IN6P_HOPLIMIT);
1650 case IPV6_RECVHOPOPTS:
1651 OPTSET2292_EXCLUSIVE(IN6P_HOPOPTS);
1654 case IPV6_RECVDSTOPTS:
1655 OPTSET2292_EXCLUSIVE(IN6P_DSTOPTS);
1658 case IPV6_RECVRTHDRDSTOPTS:
1659 OPTSET2292_EXCLUSIVE(IN6P_RTHDRDSTOPTS);
1662 case IPV6_RECVRTHDR:
1663 OPTSET2292_EXCLUSIVE(IN6P_RTHDR);
1666 case IPV6_RECVPATHMTU:
1668 * We ignore this option for TCP
1670 * (RFC3542 leaves this case
1673 if (uproto != IPPROTO_TCP)
1677 case IPV6_RECVFLOWID:
1678 OPTSET2(INP_RECVFLOWID, optval);
1682 case IPV6_RECVRSSBUCKETID:
1683 OPTSET2(INP_RECVRSSBUCKETID, optval);
1689 * make setsockopt(IPV6_V6ONLY)
1690 * available only prior to bind(2).
1691 * see ipng mailing list, Jun 22 2001.
1693 if (in6p->inp_lport ||
1694 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1698 OPTSET(IN6P_IPV6_V6ONLY);
1700 in6p->inp_vflag &= ~INP_IPV4;
1702 in6p->inp_vflag |= INP_IPV4;
1704 case IPV6_RECVTCLASS:
1705 /* cannot mix with RFC2292 XXX */
1706 OPTSET2292_EXCLUSIVE(IN6P_TCLASS);
1708 case IPV6_AUTOFLOWLABEL:
1709 OPTSET(IN6P_AUTOFLOWLABEL);
1712 case IPV6_ORIGDSTADDR:
1713 OPTSET2(INP_ORIGDSTADDR, optval);
1716 OPTSET(INP_BINDANY);
1719 case IPV6_BINDMULTI:
1720 OPTSET2(INP_BINDMULTI, optval);
1723 case IPV6_RSS_LISTEN_BUCKET:
1724 if ((optval >= 0) &&
1725 (optval < rss_getnumbuckets())) {
1727 in6p->inp_rss_listen_bucket = optval;
1728 OPTSET2_N(INP_RSS_BUCKET_SET, 1);
1740 case IPV6_USE_MIN_MTU:
1741 case IPV6_PREFER_TEMPADDR:
1742 if (optlen != sizeof(optval)) {
1746 error = sooptcopyin(sopt, &optval,
1747 sizeof optval, sizeof optval);
1751 struct ip6_pktopts **optp;
1752 optp = &in6p->in6p_outputopts;
1753 error = ip6_pcbopt(optname,
1754 (u_char *)&optval, sizeof(optval),
1755 optp, (td != NULL) ? td->td_ucred :
1760 case IPV6_2292PKTINFO:
1761 case IPV6_2292HOPLIMIT:
1762 case IPV6_2292HOPOPTS:
1763 case IPV6_2292DSTOPTS:
1764 case IPV6_2292RTHDR:
1766 if (optlen != sizeof(int)) {
1770 error = sooptcopyin(sopt, &optval,
1771 sizeof optval, sizeof optval);
1775 case IPV6_2292PKTINFO:
1776 OPTSET2292(IN6P_PKTINFO);
1778 case IPV6_2292HOPLIMIT:
1779 OPTSET2292(IN6P_HOPLIMIT);
1781 case IPV6_2292HOPOPTS:
1783 * Check super-user privilege.
1784 * See comments for IPV6_RECVHOPOPTS.
1787 error = priv_check(td,
1788 PRIV_NETINET_SETHDROPTS);
1792 OPTSET2292(IN6P_HOPOPTS);
1794 case IPV6_2292DSTOPTS:
1796 error = priv_check(td,
1797 PRIV_NETINET_SETHDROPTS);
1801 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1803 case IPV6_2292RTHDR:
1804 OPTSET2292(IN6P_RTHDR);
1812 case IPV6_RTHDRDSTOPTS:
1815 /* new advanced API (RFC3542) */
1817 u_char optbuf_storage[MCLBYTES];
1819 struct ip6_pktopts **optp;
1821 /* cannot mix with RFC2292 */
1822 if (OPTBIT(IN6P_RFC2292)) {
1828 * We only ensure valsize is not too large
1829 * here. Further validation will be done
1832 error = sooptcopyin(sopt, optbuf_storage,
1833 sizeof(optbuf_storage), 0);
1836 optlen = sopt->sopt_valsize;
1837 optbuf = optbuf_storage;
1838 optp = &in6p->in6p_outputopts;
1839 error = ip6_pcbopt(optname, optbuf, optlen,
1840 optp, (td != NULL) ? td->td_ucred : NULL,
1846 case IPV6_MULTICAST_IF:
1847 case IPV6_MULTICAST_HOPS:
1848 case IPV6_MULTICAST_LOOP:
1849 case IPV6_JOIN_GROUP:
1850 case IPV6_LEAVE_GROUP:
1852 case MCAST_BLOCK_SOURCE:
1853 case MCAST_UNBLOCK_SOURCE:
1854 case MCAST_JOIN_GROUP:
1855 case MCAST_LEAVE_GROUP:
1856 case MCAST_JOIN_SOURCE_GROUP:
1857 case MCAST_LEAVE_SOURCE_GROUP:
1858 error = ip6_setmoptions(in6p, sopt);
1861 case IPV6_PORTRANGE:
1862 error = sooptcopyin(sopt, &optval,
1863 sizeof optval, sizeof optval);
1869 case IPV6_PORTRANGE_DEFAULT:
1870 in6p->inp_flags &= ~(INP_LOWPORT);
1871 in6p->inp_flags &= ~(INP_HIGHPORT);
1874 case IPV6_PORTRANGE_HIGH:
1875 in6p->inp_flags &= ~(INP_LOWPORT);
1876 in6p->inp_flags |= INP_HIGHPORT;
1879 case IPV6_PORTRANGE_LOW:
1880 in6p->inp_flags &= ~(INP_HIGHPORT);
1881 in6p->inp_flags |= INP_LOWPORT;
1891 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1892 case IPV6_IPSEC_POLICY:
1893 if (IPSEC_ENABLED(ipv6)) {
1894 error = IPSEC_PCBCTL(ipv6, in6p, sopt);
1901 error = ENOPROTOOPT;
1909 case IPV6_2292PKTOPTIONS:
1910 #ifdef IPV6_PKTOPTIONS
1911 case IPV6_PKTOPTIONS:
1914 * RFC3542 (effectively) deprecated the
1915 * semantics of the 2292-style pktoptions.
1916 * Since it was not reliable in nature (i.e.,
1917 * applications had to expect the lack of some
1918 * information after all), it would make sense
1919 * to simplify this part by always returning
1922 sopt->sopt_valsize = 0;
1925 case IPV6_RECVHOPOPTS:
1926 case IPV6_RECVDSTOPTS:
1927 case IPV6_RECVRTHDRDSTOPTS:
1928 case IPV6_UNICAST_HOPS:
1929 case IPV6_RECVPKTINFO:
1930 case IPV6_RECVHOPLIMIT:
1931 case IPV6_RECVRTHDR:
1932 case IPV6_RECVPATHMTU:
1935 case IPV6_PORTRANGE:
1936 case IPV6_RECVTCLASS:
1937 case IPV6_AUTOFLOWLABEL:
1941 case IPV6_RECVFLOWID:
1943 case IPV6_RSSBUCKETID:
1944 case IPV6_RECVRSSBUCKETID:
1946 case IPV6_BINDMULTI:
1949 case IPV6_RECVHOPOPTS:
1950 optval = OPTBIT(IN6P_HOPOPTS);
1953 case IPV6_RECVDSTOPTS:
1954 optval = OPTBIT(IN6P_DSTOPTS);
1957 case IPV6_RECVRTHDRDSTOPTS:
1958 optval = OPTBIT(IN6P_RTHDRDSTOPTS);
1961 case IPV6_UNICAST_HOPS:
1962 optval = in6p->in6p_hops;
1965 case IPV6_RECVPKTINFO:
1966 optval = OPTBIT(IN6P_PKTINFO);
1969 case IPV6_RECVHOPLIMIT:
1970 optval = OPTBIT(IN6P_HOPLIMIT);
1973 case IPV6_RECVRTHDR:
1974 optval = OPTBIT(IN6P_RTHDR);
1977 case IPV6_RECVPATHMTU:
1978 optval = OPTBIT(IN6P_MTU);
1982 optval = OPTBIT(IN6P_IPV6_V6ONLY);
1985 case IPV6_PORTRANGE:
1988 flags = in6p->inp_flags;
1989 if (flags & INP_HIGHPORT)
1990 optval = IPV6_PORTRANGE_HIGH;
1991 else if (flags & INP_LOWPORT)
1992 optval = IPV6_PORTRANGE_LOW;
1997 case IPV6_RECVTCLASS:
1998 optval = OPTBIT(IN6P_TCLASS);
2001 case IPV6_AUTOFLOWLABEL:
2002 optval = OPTBIT(IN6P_AUTOFLOWLABEL);
2005 case IPV6_ORIGDSTADDR:
2006 optval = OPTBIT2(INP_ORIGDSTADDR);
2010 optval = OPTBIT(INP_BINDANY);
2014 optval = in6p->inp_flowid;
2018 optval = in6p->inp_flowtype;
2021 case IPV6_RECVFLOWID:
2022 optval = OPTBIT2(INP_RECVFLOWID);
2025 case IPV6_RSSBUCKETID:
2027 rss_hash2bucket(in6p->inp_flowid,
2031 optval = rss_bucket;
2036 case IPV6_RECVRSSBUCKETID:
2037 optval = OPTBIT2(INP_RECVRSSBUCKETID);
2041 case IPV6_BINDMULTI:
2042 optval = OPTBIT2(INP_BINDMULTI);
2048 error = sooptcopyout(sopt, &optval,
2055 struct ip6_mtuinfo mtuinfo;
2056 struct in6_addr addr;
2058 if (!(so->so_state & SS_ISCONNECTED))
2061 * XXX: we dot not consider the case of source
2062 * routing, or optional information to specify
2063 * the outgoing interface.
2064 * Copy faddr out of in6p to avoid holding lock
2065 * on inp during route lookup.
2068 bcopy(&in6p->in6p_faddr, &addr, sizeof(addr));
2070 error = ip6_getpmtu_ctl(so->so_fibnum,
2074 if (pmtu > IPV6_MAXPACKET)
2075 pmtu = IPV6_MAXPACKET;
2077 bzero(&mtuinfo, sizeof(mtuinfo));
2078 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
2079 optdata = (void *)&mtuinfo;
2080 optdatalen = sizeof(mtuinfo);
2081 error = sooptcopyout(sopt, optdata,
2086 case IPV6_2292PKTINFO:
2087 case IPV6_2292HOPLIMIT:
2088 case IPV6_2292HOPOPTS:
2089 case IPV6_2292RTHDR:
2090 case IPV6_2292DSTOPTS:
2092 case IPV6_2292PKTINFO:
2093 optval = OPTBIT(IN6P_PKTINFO);
2095 case IPV6_2292HOPLIMIT:
2096 optval = OPTBIT(IN6P_HOPLIMIT);
2098 case IPV6_2292HOPOPTS:
2099 optval = OPTBIT(IN6P_HOPOPTS);
2101 case IPV6_2292RTHDR:
2102 optval = OPTBIT(IN6P_RTHDR);
2104 case IPV6_2292DSTOPTS:
2105 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
2108 error = sooptcopyout(sopt, &optval,
2115 case IPV6_RTHDRDSTOPTS:
2119 case IPV6_USE_MIN_MTU:
2120 case IPV6_PREFER_TEMPADDR:
2121 error = ip6_getpcbopt(in6p, optname, sopt);
2124 case IPV6_MULTICAST_IF:
2125 case IPV6_MULTICAST_HOPS:
2126 case IPV6_MULTICAST_LOOP:
2128 error = ip6_getmoptions(in6p, sopt);
2131 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
2132 case IPV6_IPSEC_POLICY:
2133 if (IPSEC_ENABLED(ipv6)) {
2134 error = IPSEC_PCBCTL(ipv6, in6p, sopt);
2140 error = ENOPROTOOPT;
2150 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2152 int error = 0, optval, optlen;
2153 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2154 struct inpcb *in6p = sotoinpcb(so);
2155 int level, op, optname;
2157 level = sopt->sopt_level;
2158 op = sopt->sopt_dir;
2159 optname = sopt->sopt_name;
2160 optlen = sopt->sopt_valsize;
2162 if (level != IPPROTO_IPV6) {
2169 * For ICMPv6 sockets, no modification allowed for checksum
2170 * offset, permit "no change" values to help existing apps.
2172 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2173 * for an ICMPv6 socket will fail."
2174 * The current behavior does not meet RFC3542.
2178 if (optlen != sizeof(int)) {
2182 error = sooptcopyin(sopt, &optval, sizeof(optval),
2186 if ((optval % 2) != 0) {
2187 /* the API assumes even offset values */
2189 } else if (so->so_proto->pr_protocol ==
2191 if (optval != icmp6off)
2194 in6p->in6p_cksum = optval;
2198 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
2201 optval = in6p->in6p_cksum;
2203 error = sooptcopyout(sopt, &optval, sizeof(optval));
2213 error = ENOPROTOOPT;
2221 * Set up IP6 options in pcb for insertion in output packets or
2222 * specifying behavior of outgoing packets.
2225 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2226 struct socket *so, struct sockopt *sopt)
2228 struct ip6_pktopts *opt = *pktopt;
2230 struct thread *td = sopt->sopt_td;
2232 /* turn off any old options. */
2235 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2236 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2237 opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2238 printf("ip6_pcbopts: all specified options are cleared.\n");
2240 ip6_clearpktopts(opt, -1);
2242 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2245 if (!m || m->m_len == 0) {
2247 * Only turning off any previous options, regardless of
2248 * whether the opt is just created or given.
2250 free(opt, M_IP6OPT);
2254 /* set options specified by user. */
2255 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2256 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2257 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2258 free(opt, M_IP6OPT);
2266 * initialize ip6_pktopts. beware that there are non-zero default values in
2270 ip6_initpktopts(struct ip6_pktopts *opt)
2273 bzero(opt, sizeof(*opt));
2274 opt->ip6po_hlim = -1; /* -1 means default hop limit */
2275 opt->ip6po_tclass = -1; /* -1 means default traffic class */
2276 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2277 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2281 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2282 struct ucred *cred, int uproto)
2284 struct ip6_pktopts *opt;
2286 if (*pktopt == NULL) {
2287 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2289 ip6_initpktopts(*pktopt);
2293 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
2296 #define GET_PKTOPT_VAR(field, lenexpr) do { \
2297 if (pktopt && pktopt->field) { \
2298 INP_RUNLOCK(in6p); \
2299 optdata = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK); \
2300 malloc_optdata = true; \
2302 if (in6p->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \
2303 INP_RUNLOCK(in6p); \
2304 free(optdata, M_TEMP); \
2305 return (ECONNRESET); \
2307 pktopt = in6p->in6p_outputopts; \
2308 if (pktopt && pktopt->field) { \
2309 optdatalen = min(lenexpr, sopt->sopt_valsize); \
2310 bcopy(&pktopt->field, optdata, optdatalen); \
2312 free(optdata, M_TEMP); \
2314 malloc_optdata = false; \
2319 #define GET_PKTOPT_EXT_HDR(field) GET_PKTOPT_VAR(field, \
2320 (((struct ip6_ext *)pktopt->field)->ip6e_len + 1) << 3)
2322 #define GET_PKTOPT_SOCKADDR(field) GET_PKTOPT_VAR(field, \
2323 pktopt->field->sa_len)
2326 ip6_getpcbopt(struct inpcb *in6p, int optname, struct sockopt *sopt)
2328 void *optdata = NULL;
2329 bool malloc_optdata = false;
2332 struct in6_pktinfo null_pktinfo;
2333 int deftclass = 0, on;
2334 int defminmtu = IP6PO_MINMTU_MCASTONLY;
2335 int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2336 struct ip6_pktopts *pktopt;
2339 pktopt = in6p->in6p_outputopts;
2343 optdata = (void *)&null_pktinfo;
2344 if (pktopt && pktopt->ip6po_pktinfo) {
2345 bcopy(pktopt->ip6po_pktinfo, &null_pktinfo,
2346 sizeof(null_pktinfo));
2347 in6_clearscope(&null_pktinfo.ipi6_addr);
2349 /* XXX: we don't have to do this every time... */
2350 bzero(&null_pktinfo, sizeof(null_pktinfo));
2352 optdatalen = sizeof(struct in6_pktinfo);
2355 if (pktopt && pktopt->ip6po_tclass >= 0)
2356 deftclass = pktopt->ip6po_tclass;
2357 optdata = (void *)&deftclass;
2358 optdatalen = sizeof(int);
2361 GET_PKTOPT_EXT_HDR(ip6po_hbh);
2364 GET_PKTOPT_EXT_HDR(ip6po_rthdr);
2366 case IPV6_RTHDRDSTOPTS:
2367 GET_PKTOPT_EXT_HDR(ip6po_dest1);
2370 GET_PKTOPT_EXT_HDR(ip6po_dest2);
2373 GET_PKTOPT_SOCKADDR(ip6po_nexthop);
2375 case IPV6_USE_MIN_MTU:
2377 defminmtu = pktopt->ip6po_minmtu;
2378 optdata = (void *)&defminmtu;
2379 optdatalen = sizeof(int);
2382 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2386 optdata = (void *)&on;
2387 optdatalen = sizeof(on);
2389 case IPV6_PREFER_TEMPADDR:
2391 defpreftemp = pktopt->ip6po_prefer_tempaddr;
2392 optdata = (void *)&defpreftemp;
2393 optdatalen = sizeof(int);
2395 default: /* should not happen */
2397 panic("ip6_getpcbopt: unexpected option\n");
2400 return (ENOPROTOOPT);
2404 error = sooptcopyout(sopt, optdata, optdatalen);
2406 free(optdata, M_TEMP);
2412 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2417 if (optname == -1 || optname == IPV6_PKTINFO) {
2418 if (pktopt->ip6po_pktinfo)
2419 free(pktopt->ip6po_pktinfo, M_IP6OPT);
2420 pktopt->ip6po_pktinfo = NULL;
2422 if (optname == -1 || optname == IPV6_HOPLIMIT)
2423 pktopt->ip6po_hlim = -1;
2424 if (optname == -1 || optname == IPV6_TCLASS)
2425 pktopt->ip6po_tclass = -1;
2426 if (optname == -1 || optname == IPV6_NEXTHOP) {
2427 if (pktopt->ip6po_nextroute.ro_rt) {
2428 RTFREE(pktopt->ip6po_nextroute.ro_rt);
2429 pktopt->ip6po_nextroute.ro_rt = NULL;
2431 if (pktopt->ip6po_nexthop)
2432 free(pktopt->ip6po_nexthop, M_IP6OPT);
2433 pktopt->ip6po_nexthop = NULL;
2435 if (optname == -1 || optname == IPV6_HOPOPTS) {
2436 if (pktopt->ip6po_hbh)
2437 free(pktopt->ip6po_hbh, M_IP6OPT);
2438 pktopt->ip6po_hbh = NULL;
2440 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2441 if (pktopt->ip6po_dest1)
2442 free(pktopt->ip6po_dest1, M_IP6OPT);
2443 pktopt->ip6po_dest1 = NULL;
2445 if (optname == -1 || optname == IPV6_RTHDR) {
2446 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2447 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2448 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2449 if (pktopt->ip6po_route.ro_rt) {
2450 RTFREE(pktopt->ip6po_route.ro_rt);
2451 pktopt->ip6po_route.ro_rt = NULL;
2454 if (optname == -1 || optname == IPV6_DSTOPTS) {
2455 if (pktopt->ip6po_dest2)
2456 free(pktopt->ip6po_dest2, M_IP6OPT);
2457 pktopt->ip6po_dest2 = NULL;
2461 #define PKTOPT_EXTHDRCPY(type) \
2464 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2465 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2466 if (dst->type == NULL)\
2468 bcopy(src->type, dst->type, hlen);\
2470 } while (/*CONSTCOND*/ 0)
2473 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2475 if (dst == NULL || src == NULL) {
2476 printf("ip6_clearpktopts: invalid argument\n");
2480 dst->ip6po_hlim = src->ip6po_hlim;
2481 dst->ip6po_tclass = src->ip6po_tclass;
2482 dst->ip6po_flags = src->ip6po_flags;
2483 dst->ip6po_minmtu = src->ip6po_minmtu;
2484 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2485 if (src->ip6po_pktinfo) {
2486 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2488 if (dst->ip6po_pktinfo == NULL)
2490 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2492 if (src->ip6po_nexthop) {
2493 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2495 if (dst->ip6po_nexthop == NULL)
2497 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2498 src->ip6po_nexthop->sa_len);
2500 PKTOPT_EXTHDRCPY(ip6po_hbh);
2501 PKTOPT_EXTHDRCPY(ip6po_dest1);
2502 PKTOPT_EXTHDRCPY(ip6po_dest2);
2503 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2507 ip6_clearpktopts(dst, -1);
2510 #undef PKTOPT_EXTHDRCPY
2512 struct ip6_pktopts *
2513 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2516 struct ip6_pktopts *dst;
2518 dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2521 ip6_initpktopts(dst);
2523 if ((error = copypktopts(dst, src, canwait)) != 0) {
2524 free(dst, M_IP6OPT);
2532 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2537 ip6_clearpktopts(pktopt, -1);
2539 free(pktopt, M_IP6OPT);
2543 * Set IPv6 outgoing packet options based on advanced API.
2546 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2547 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2549 struct cmsghdr *cm = NULL;
2551 if (control == NULL || opt == NULL)
2554 ip6_initpktopts(opt);
2559 * If stickyopt is provided, make a local copy of the options
2560 * for this particular packet, then override them by ancillary
2562 * XXX: copypktopts() does not copy the cached route to a next
2563 * hop (if any). This is not very good in terms of efficiency,
2564 * but we can allow this since this option should be rarely
2567 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2572 * XXX: Currently, we assume all the optional information is stored
2575 if (control->m_next)
2578 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2579 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2582 if (control->m_len < CMSG_LEN(0))
2585 cm = mtod(control, struct cmsghdr *);
2586 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2588 if (cm->cmsg_level != IPPROTO_IPV6)
2591 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2592 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2601 * Set a particular packet option, as a sticky option or an ancillary data
2602 * item. "len" can be 0 only when it's a sticky option.
2603 * We have 4 cases of combination of "sticky" and "cmsg":
2604 * "sticky=0, cmsg=0": impossible
2605 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2606 * "sticky=1, cmsg=0": RFC3542 socket option
2607 * "sticky=1, cmsg=1": RFC2292 socket option
2610 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2611 struct ucred *cred, int sticky, int cmsg, int uproto)
2613 int minmtupolicy, preftemp;
2616 if (!sticky && !cmsg) {
2618 printf("ip6_setpktopt: impossible case\n");
2624 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2625 * not be specified in the context of RFC3542. Conversely,
2626 * RFC3542 types should not be specified in the context of RFC2292.
2630 case IPV6_2292PKTINFO:
2631 case IPV6_2292HOPLIMIT:
2632 case IPV6_2292NEXTHOP:
2633 case IPV6_2292HOPOPTS:
2634 case IPV6_2292DSTOPTS:
2635 case IPV6_2292RTHDR:
2636 case IPV6_2292PKTOPTIONS:
2637 return (ENOPROTOOPT);
2640 if (sticky && cmsg) {
2647 case IPV6_RTHDRDSTOPTS:
2649 case IPV6_USE_MIN_MTU:
2652 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2653 return (ENOPROTOOPT);
2658 case IPV6_2292PKTINFO:
2661 struct ifnet *ifp = NULL;
2662 struct in6_pktinfo *pktinfo;
2664 if (len != sizeof(struct in6_pktinfo))
2667 pktinfo = (struct in6_pktinfo *)buf;
2670 * An application can clear any sticky IPV6_PKTINFO option by
2671 * doing a "regular" setsockopt with ipi6_addr being
2672 * in6addr_any and ipi6_ifindex being zero.
2673 * [RFC 3542, Section 6]
2675 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2676 pktinfo->ipi6_ifindex == 0 &&
2677 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2678 ip6_clearpktopts(opt, optname);
2682 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2683 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2686 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr))
2688 /* validate the interface index if specified. */
2689 if (pktinfo->ipi6_ifindex > V_if_index)
2691 if (pktinfo->ipi6_ifindex) {
2692 ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2696 if (ifp != NULL && (ifp->if_afdata[AF_INET6] == NULL ||
2697 (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) != 0))
2701 !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2702 struct in6_ifaddr *ia;
2704 in6_setscope(&pktinfo->ipi6_addr, ifp, NULL);
2705 ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr);
2707 return (EADDRNOTAVAIL);
2708 ifa_free(&ia->ia_ifa);
2711 * We store the address anyway, and let in6_selectsrc()
2712 * validate the specified address. This is because ipi6_addr
2713 * may not have enough information about its scope zone, and
2714 * we may need additional information (such as outgoing
2715 * interface or the scope zone of a destination address) to
2716 * disambiguate the scope.
2717 * XXX: the delay of the validation may confuse the
2718 * application when it is used as a sticky option.
2720 if (opt->ip6po_pktinfo == NULL) {
2721 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2722 M_IP6OPT, M_NOWAIT);
2723 if (opt->ip6po_pktinfo == NULL)
2726 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2730 case IPV6_2292HOPLIMIT:
2736 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2737 * to simplify the ordering among hoplimit options.
2739 if (optname == IPV6_HOPLIMIT && sticky)
2740 return (ENOPROTOOPT);
2742 if (len != sizeof(int))
2745 if (*hlimp < -1 || *hlimp > 255)
2748 opt->ip6po_hlim = *hlimp;
2756 if (len != sizeof(int))
2758 tclass = *(int *)buf;
2759 if (tclass < -1 || tclass > 255)
2762 opt->ip6po_tclass = tclass;
2766 case IPV6_2292NEXTHOP:
2769 error = priv_check_cred(cred,
2770 PRIV_NETINET_SETHDROPTS, 0);
2775 if (len == 0) { /* just remove the option */
2776 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2780 /* check if cmsg_len is large enough for sa_len */
2781 if (len < sizeof(struct sockaddr) || len < *buf)
2784 switch (((struct sockaddr *)buf)->sa_family) {
2787 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
2790 if (sa6->sin6_len != sizeof(struct sockaddr_in6))
2793 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
2794 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
2797 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
2803 case AF_LINK: /* should eventually be supported */
2805 return (EAFNOSUPPORT);
2808 /* turn off the previous option, then set the new option. */
2809 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2810 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
2811 if (opt->ip6po_nexthop == NULL)
2813 bcopy(buf, opt->ip6po_nexthop, *buf);
2816 case IPV6_2292HOPOPTS:
2819 struct ip6_hbh *hbh;
2823 * XXX: We don't allow a non-privileged user to set ANY HbH
2824 * options, since per-option restriction has too much
2828 error = priv_check_cred(cred,
2829 PRIV_NETINET_SETHDROPTS, 0);
2835 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2836 break; /* just remove the option */
2839 /* message length validation */
2840 if (len < sizeof(struct ip6_hbh))
2842 hbh = (struct ip6_hbh *)buf;
2843 hbhlen = (hbh->ip6h_len + 1) << 3;
2847 /* turn off the previous option, then set the new option. */
2848 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2849 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
2850 if (opt->ip6po_hbh == NULL)
2852 bcopy(hbh, opt->ip6po_hbh, hbhlen);
2857 case IPV6_2292DSTOPTS:
2859 case IPV6_RTHDRDSTOPTS:
2861 struct ip6_dest *dest, **newdest = NULL;
2864 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
2865 error = priv_check_cred(cred,
2866 PRIV_NETINET_SETHDROPTS, 0);
2872 ip6_clearpktopts(opt, optname);
2873 break; /* just remove the option */
2876 /* message length validation */
2877 if (len < sizeof(struct ip6_dest))
2879 dest = (struct ip6_dest *)buf;
2880 destlen = (dest->ip6d_len + 1) << 3;
2885 * Determine the position that the destination options header
2886 * should be inserted; before or after the routing header.
2889 case IPV6_2292DSTOPTS:
2891 * The old advacned API is ambiguous on this point.
2892 * Our approach is to determine the position based
2893 * according to the existence of a routing header.
2894 * Note, however, that this depends on the order of the
2895 * extension headers in the ancillary data; the 1st
2896 * part of the destination options header must appear
2897 * before the routing header in the ancillary data,
2899 * RFC3542 solved the ambiguity by introducing
2900 * separate ancillary data or option types.
2902 if (opt->ip6po_rthdr == NULL)
2903 newdest = &opt->ip6po_dest1;
2905 newdest = &opt->ip6po_dest2;
2907 case IPV6_RTHDRDSTOPTS:
2908 newdest = &opt->ip6po_dest1;
2911 newdest = &opt->ip6po_dest2;
2915 /* turn off the previous option, then set the new option. */
2916 ip6_clearpktopts(opt, optname);
2917 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
2918 if (*newdest == NULL)
2920 bcopy(dest, *newdest, destlen);
2925 case IPV6_2292RTHDR:
2928 struct ip6_rthdr *rth;
2932 ip6_clearpktopts(opt, IPV6_RTHDR);
2933 break; /* just remove the option */
2936 /* message length validation */
2937 if (len < sizeof(struct ip6_rthdr))
2939 rth = (struct ip6_rthdr *)buf;
2940 rthlen = (rth->ip6r_len + 1) << 3;
2944 switch (rth->ip6r_type) {
2945 case IPV6_RTHDR_TYPE_0:
2946 if (rth->ip6r_len == 0) /* must contain one addr */
2948 if (rth->ip6r_len % 2) /* length must be even */
2950 if (rth->ip6r_len / 2 != rth->ip6r_segleft)
2954 return (EINVAL); /* not supported */
2957 /* turn off the previous option */
2958 ip6_clearpktopts(opt, IPV6_RTHDR);
2959 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
2960 if (opt->ip6po_rthdr == NULL)
2962 bcopy(rth, opt->ip6po_rthdr, rthlen);
2967 case IPV6_USE_MIN_MTU:
2968 if (len != sizeof(int))
2970 minmtupolicy = *(int *)buf;
2971 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
2972 minmtupolicy != IP6PO_MINMTU_DISABLE &&
2973 minmtupolicy != IP6PO_MINMTU_ALL) {
2976 opt->ip6po_minmtu = minmtupolicy;
2980 if (len != sizeof(int))
2983 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
2985 * we ignore this option for TCP sockets.
2986 * (RFC3542 leaves this case unspecified.)
2988 opt->ip6po_flags &= ~IP6PO_DONTFRAG;
2990 opt->ip6po_flags |= IP6PO_DONTFRAG;
2993 case IPV6_PREFER_TEMPADDR:
2994 if (len != sizeof(int))
2996 preftemp = *(int *)buf;
2997 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
2998 preftemp != IP6PO_TEMPADDR_NOTPREFER &&
2999 preftemp != IP6PO_TEMPADDR_PREFER) {
3002 opt->ip6po_prefer_tempaddr = preftemp;
3006 return (ENOPROTOOPT);
3007 } /* end of switch */
3013 * Routine called from ip6_output() to loop back a copy of an IP6 multicast
3014 * packet to the input queue of a specified interface. Note that this
3015 * calls the output routine of the loopback "driver", but with an interface
3016 * pointer that might NOT be &loif -- easier than replicating that code here.
3019 ip6_mloopback(struct ifnet *ifp, struct mbuf *m)
3022 struct ip6_hdr *ip6;
3024 copym = m_copym(m, 0, M_COPYALL, M_NOWAIT);
3029 * Make sure to deep-copy IPv6 header portion in case the data
3030 * is in an mbuf cluster, so that we can safely override the IPv6
3031 * header portion later.
3033 if (!M_WRITABLE(copym) ||
3034 copym->m_len < sizeof(struct ip6_hdr)) {
3035 copym = m_pullup(copym, sizeof(struct ip6_hdr));
3039 ip6 = mtod(copym, struct ip6_hdr *);
3041 * clear embedded scope identifiers if necessary.
3042 * in6_clearscope will touch the addresses only when necessary.
3044 in6_clearscope(&ip6->ip6_src);
3045 in6_clearscope(&ip6->ip6_dst);
3046 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
3047 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 |
3049 copym->m_pkthdr.csum_data = 0xffff;
3051 if_simloop(ifp, copym, AF_INET6, 0);
3055 * Chop IPv6 header off from the payload.
3058 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
3061 struct ip6_hdr *ip6;
3063 ip6 = mtod(m, struct ip6_hdr *);
3064 if (m->m_len > sizeof(*ip6)) {
3065 mh = m_gethdr(M_NOWAIT, MT_DATA);
3070 m_move_pkthdr(mh, m);
3071 M_ALIGN(mh, sizeof(*ip6));
3072 m->m_len -= sizeof(*ip6);
3073 m->m_data += sizeof(*ip6);
3076 m->m_len = sizeof(*ip6);
3077 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
3079 exthdrs->ip6e_ip6 = m;
3084 * Compute IPv6 extension header length.
3087 ip6_optlen(struct inpcb *in6p)
3091 if (!in6p->in6p_outputopts)
3096 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
3098 len += elen(in6p->in6p_outputopts->ip6po_hbh);
3099 if (in6p->in6p_outputopts->ip6po_rthdr)
3100 /* dest1 is valid with rthdr only */
3101 len += elen(in6p->in6p_outputopts->ip6po_dest1);
3102 len += elen(in6p->in6p_outputopts->ip6po_rthdr);
3103 len += elen(in6p->in6p_outputopts->ip6po_dest2);