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"
68 #include "opt_ipsec.h"
70 #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/if_var.h>
90 #include <net/if_llatbl.h>
91 #include <net/netisr.h>
92 #include <net/route.h>
94 #include <net/rss_config.h>
97 #include <netinet/in.h>
98 #include <netinet/in_var.h>
99 #include <netinet/ip_var.h>
100 #include <netinet6/in6_fib.h>
101 #include <netinet6/in6_var.h>
102 #include <netinet/ip6.h>
103 #include <netinet/icmp6.h>
104 #include <netinet6/ip6_var.h>
105 #include <netinet/in_pcb.h>
106 #include <netinet/tcp_var.h>
107 #include <netinet6/nd6.h>
108 #include <netinet6/in6_rss.h>
111 #include <netipsec/ipsec.h>
112 #include <netipsec/ipsec6.h>
113 #include <netipsec/key.h>
114 #include <netinet6/ip6_ipsec.h>
117 #include <netinet/sctp.h>
118 #include <netinet/sctp_crc32.h>
121 #include <netinet6/ip6protosw.h>
122 #include <netinet6/scope6_var.h>
125 #include <net/flowtable.h>
128 extern int in6_mcast_loop;
131 struct mbuf *ip6e_ip6;
132 struct mbuf *ip6e_hbh;
133 struct mbuf *ip6e_dest1;
134 struct mbuf *ip6e_rthdr;
135 struct mbuf *ip6e_dest2;
138 static MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
140 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **,
141 struct ucred *, int);
142 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *,
143 struct socket *, struct sockopt *);
144 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *);
145 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *,
146 struct ucred *, int, int, int);
148 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
149 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
151 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
152 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
153 static int ip6_getpmtu(struct route_in6 *, int,
154 struct ifnet *, const struct in6_addr *, u_long *, int *, u_int,
156 static int ip6_calcmtu(struct ifnet *, const struct in6_addr *, u_long,
157 u_long *, int *, u_int);
158 static int ip6_getpmtu_ctl(u_int, const struct in6_addr *, u_long *);
159 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
163 * Make an extension header from option data. hp is the source, and
164 * mp is the destination.
166 #define MAKE_EXTHDR(hp, mp) \
169 struct ip6_ext *eh = (struct ip6_ext *)(hp); \
170 error = ip6_copyexthdr((mp), (caddr_t)(hp), \
171 ((eh)->ip6e_len + 1) << 3); \
175 } while (/*CONSTCOND*/ 0)
178 * Form a chain of extension headers.
179 * m is the extension header mbuf
180 * mp is the previous mbuf in the chain
181 * p is the next header
182 * i is the type of option.
184 #define MAKE_CHAIN(m, mp, p, i)\
188 panic("assumption failed: hdr not split"); \
189 *mtod((m), u_char *) = *(p);\
191 p = mtod((m), u_char *);\
192 (m)->m_next = (mp)->m_next;\
196 } while (/*CONSTCOND*/ 0)
199 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
203 csum = in_cksum_skip(m, offset + plen, offset);
204 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
206 offset += m->m_pkthdr.csum_data; /* checksum offset */
208 if (offset + sizeof(u_short) > m->m_len) {
209 printf("%s: delayed m_pullup, m->len: %d plen %u off %u "
210 "csum_flags=%b\n", __func__, m->m_len, plen, offset,
211 (int)m->m_pkthdr.csum_flags, CSUM_BITS);
213 * XXX this should not happen, but if it does, the correct
214 * behavior may be to insert the checksum in the appropriate
215 * next mbuf in the chain.
219 *(u_short *)(m->m_data + offset) = csum;
223 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto,
224 int mtu, uint32_t id)
226 struct mbuf *m, **mnext, *m_frgpart;
227 struct ip6_hdr *ip6, *mhip6;
228 struct ip6_frag *ip6f;
231 int tlen = m0->m_pkthdr.len;
234 ip6 = mtod(m, struct ip6_hdr *);
235 mnext = &m->m_nextpkt;
237 for (off = hlen; off < tlen; off += mtu) {
238 m = m_gethdr(M_NOWAIT, MT_DATA);
240 IP6STAT_INC(ip6s_odropped);
243 m->m_flags = m0->m_flags & M_COPYFLAGS;
245 mnext = &m->m_nextpkt;
246 m->m_data += max_linkhdr;
247 mhip6 = mtod(m, struct ip6_hdr *);
249 m->m_len = sizeof(*mhip6);
250 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
252 IP6STAT_INC(ip6s_odropped);
255 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
256 if (off + mtu >= tlen)
259 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
260 mhip6->ip6_plen = htons((u_short)(mtu + hlen +
261 sizeof(*ip6f) - sizeof(struct ip6_hdr)));
262 if ((m_frgpart = m_copy(m0, off, mtu)) == NULL) {
263 IP6STAT_INC(ip6s_odropped);
267 m->m_pkthdr.len = mtu + hlen + sizeof(*ip6f);
268 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum;
269 m->m_pkthdr.rcvif = NULL;
270 ip6f->ip6f_reserved = 0;
271 ip6f->ip6f_ident = id;
272 ip6f->ip6f_nxt = nextproto;
273 IP6STAT_INC(ip6s_ofragments);
274 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
281 * IP6 output. The packet in mbuf chain m contains a skeletal IP6
282 * header (with pri, len, nxt, hlim, src, dst).
283 * This function may modify ver and hlim only.
284 * The mbuf chain containing the packet will be freed.
285 * The mbuf opt, if present, will not be freed.
286 * If route_in6 ro is present and has ro_rt initialized, route lookup would be
287 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
288 * then result of route lookup is stored in ro->ro_rt.
290 * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and
291 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one,
294 * ifpp - XXX: just for statistics
297 * XXX TODO: no flowid is assigned for outbound flows?
300 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
301 struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
302 struct ifnet **ifpp, struct inpcb *inp)
305 struct ifnet *ifp, *origifp;
307 struct mbuf *mprev = NULL;
309 struct route_in6 ip6route;
310 struct rtentry *rt = NULL;
311 struct sockaddr_in6 *dst, src_sa, dst_sa;
312 struct in6_addr odst;
314 struct in6_ifaddr *ia = NULL;
316 int alwaysfrag, dontfrag;
317 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
318 struct ip6_exthdrs exthdrs;
319 struct in6_addr src0, dst0;
321 struct route_in6 *ro_pmtu = NULL;
326 struct m_tag *fwd_tag = NULL;
330 M_SETFIB(m, inp->inp_inc.inc_fibnum);
331 if ((flags & IP_NODEFAULTFLOWID) == 0) {
332 /* unconditionally set flowid */
333 m->m_pkthdr.flowid = inp->inp_flowid;
334 M_HASHTYPE_SET(m, inp->inp_flowtype);
338 bzero(&exthdrs, sizeof(exthdrs));
340 /* Hop-by-Hop options header */
341 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
342 /* Destination options header(1st part) */
343 if (opt->ip6po_rthdr) {
345 * Destination options header(1st part)
346 * This only makes sense with a routing header.
347 * See Section 9.2 of RFC 3542.
348 * Disabling this part just for MIP6 convenience is
349 * a bad idea. We need to think carefully about a
350 * way to make the advanced API coexist with MIP6
351 * options, which might automatically be inserted in
354 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
357 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
358 /* Destination options header(2nd part) */
359 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
364 * IPSec checking which handles several cases.
365 * FAST IPSEC: We re-injected the packet.
366 * XXX: need scope argument.
368 switch(ip6_ipsec_output(&m, inp, &error))
370 case 1: /* Bad packet */
372 case -1: /* IPSec done */
374 case 0: /* No IPSec */
381 * Calculate the total length of the extension header chain.
382 * Keep the length of the unfragmentable part for fragmentation.
385 if (exthdrs.ip6e_hbh)
386 optlen += exthdrs.ip6e_hbh->m_len;
387 if (exthdrs.ip6e_dest1)
388 optlen += exthdrs.ip6e_dest1->m_len;
389 if (exthdrs.ip6e_rthdr)
390 optlen += exthdrs.ip6e_rthdr->m_len;
391 unfragpartlen = optlen + sizeof(struct ip6_hdr);
393 /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */
394 if (exthdrs.ip6e_dest2)
395 optlen += exthdrs.ip6e_dest2->m_len;
398 * If there is at least one extension header,
399 * separate IP6 header from the payload.
401 if (optlen && !hdrsplit) {
402 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
406 m = exthdrs.ip6e_ip6;
410 ip6 = mtod(m, struct ip6_hdr *);
412 /* adjust mbuf packet header length */
413 m->m_pkthdr.len += optlen;
414 plen = m->m_pkthdr.len - sizeof(*ip6);
416 /* If this is a jumbo payload, insert a jumbo payload option. */
417 if (plen > IPV6_MAXPACKET) {
419 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
423 m = exthdrs.ip6e_ip6;
427 ip6 = mtod(m, struct ip6_hdr *);
428 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
432 ip6->ip6_plen = htons(plen);
435 * Concatenate headers and fill in next header fields.
436 * Here we have, on "m"
438 * and we insert headers accordingly. Finally, we should be getting:
439 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
441 * during the header composing process, "m" points to IPv6 header.
442 * "mprev" points to an extension header prior to esp.
444 u_char *nexthdrp = &ip6->ip6_nxt;
448 * we treat dest2 specially. this makes IPsec processing
449 * much easier. the goal here is to make mprev point the
450 * mbuf prior to dest2.
452 * result: IPv6 dest2 payload
453 * m and mprev will point to IPv6 header.
455 if (exthdrs.ip6e_dest2) {
457 panic("assumption failed: hdr not split");
458 exthdrs.ip6e_dest2->m_next = m->m_next;
459 m->m_next = exthdrs.ip6e_dest2;
460 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
461 ip6->ip6_nxt = IPPROTO_DSTOPTS;
465 * result: IPv6 hbh dest1 rthdr dest2 payload
466 * m will point to IPv6 header. mprev will point to the
467 * extension header prior to dest2 (rthdr in the above case).
469 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
470 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
472 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
476 * If there is a routing header, discard the packet.
478 if (exthdrs.ip6e_rthdr) {
483 /* Source address validation */
484 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
485 (flags & IPV6_UNSPECSRC) == 0) {
487 IP6STAT_INC(ip6s_badscope);
490 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
492 IP6STAT_INC(ip6s_badscope);
496 IP6STAT_INC(ip6s_localout);
503 bzero((caddr_t)ro, sizeof(*ro));
505 ro->ro_flags |= RT_LLE_CACHE;
507 if (opt && opt->ip6po_rthdr)
508 ro = &opt->ip6po_route;
509 dst = (struct sockaddr_in6 *)&ro->ro_dst;
511 if (ro->ro_rt == NULL)
512 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro);
514 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
517 * if specified, try to fill in the traffic class field.
518 * do not override if a non-zero value is already set.
519 * we check the diffserv field and the ecn field separately.
521 if (opt && opt->ip6po_tclass >= 0) {
524 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
526 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
529 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
532 /* fill in or override the hop limit field, if necessary. */
533 if (opt && opt->ip6po_hlim != -1)
534 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
535 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
537 ip6->ip6_hlim = im6o->im6o_multicast_hlim;
539 ip6->ip6_hlim = V_ip6_defmcasthlim;
542 * Validate route against routing table additions;
543 * a better/more specific route might have been added.
544 * Make sure address family is set in route.
547 ro->ro_dst.sin6_family = AF_INET6;
548 RT_VALIDATE((struct route *)ro, &inp->inp_rt_cookie, fibnum);
550 if (ro->ro_rt && fwd_tag == NULL && (ro->ro_rt->rt_flags & RTF_UP) &&
551 ro->ro_dst.sin6_family == AF_INET6 &&
552 IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)) {
554 ifp = ro->ro_rt->rt_ifp;
557 LLE_FREE(ro->ro_lle); /* zeros ro_lle */
559 if (fwd_tag == NULL) {
560 bzero(&dst_sa, sizeof(dst_sa));
561 dst_sa.sin6_family = AF_INET6;
562 dst_sa.sin6_len = sizeof(dst_sa);
563 dst_sa.sin6_addr = ip6->ip6_dst;
565 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp,
569 in6_ifstat_inc(ifp, ifs6_out_discard);
575 * If in6_selectroute() does not return a route entry,
576 * dst may not have been updated.
578 *dst = dst_sa; /* XXX */
582 * then rt (for unicast) and ifp must be non-NULL valid values.
584 if ((flags & IPV6_FORWARDING) == 0) {
585 /* XXX: the FORWARDING flag can be set for mrouting. */
586 in6_ifstat_inc(ifp, ifs6_out_request);
589 ia = (struct in6_ifaddr *)(rt->rt_ifa);
590 counter_u64_add(rt->rt_pksent, 1);
595 * The outgoing interface must be in the zone of source and
596 * destination addresses.
601 if (in6_setscope(&src0, origifp, &zone))
603 bzero(&src_sa, sizeof(src_sa));
604 src_sa.sin6_family = AF_INET6;
605 src_sa.sin6_len = sizeof(src_sa);
606 src_sa.sin6_addr = ip6->ip6_src;
607 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
611 if (in6_setscope(&dst0, origifp, &zone))
613 /* re-initialize to be sure */
614 bzero(&dst_sa, sizeof(dst_sa));
615 dst_sa.sin6_family = AF_INET6;
616 dst_sa.sin6_len = sizeof(dst_sa);
617 dst_sa.sin6_addr = ip6->ip6_dst;
618 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) {
622 /* We should use ia_ifp to support the case of
623 * sending packets to an address of our own.
625 if (ia != NULL && ia->ia_ifp)
628 /* scope check is done. */
632 IP6STAT_INC(ip6s_badscope);
633 in6_ifstat_inc(origifp, ifs6_out_discard);
635 error = EHOSTUNREACH; /* XXX */
639 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
640 if (opt && opt->ip6po_nextroute.ro_rt) {
642 * The nexthop is explicitly specified by the
643 * application. We assume the next hop is an IPv6
646 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
648 else if ((rt->rt_flags & RTF_GATEWAY))
649 dst = (struct sockaddr_in6 *)rt->rt_gateway;
652 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
653 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
655 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
656 in6_ifstat_inc(ifp, ifs6_out_mcast);
658 * Confirm that the outgoing interface supports multicast.
660 if (!(ifp->if_flags & IFF_MULTICAST)) {
661 IP6STAT_INC(ip6s_noroute);
662 in6_ifstat_inc(ifp, ifs6_out_discard);
666 if ((im6o == NULL && in6_mcast_loop) ||
667 (im6o && im6o->im6o_multicast_loop)) {
669 * Loop back multicast datagram if not expressly
670 * forbidden to do so, even if we have not joined
671 * the address; protocols will filter it later,
672 * thus deferring a hash lookup and lock acquisition
673 * at the expense of an m_copym().
675 ip6_mloopback(ifp, m);
678 * If we are acting as a multicast router, perform
679 * multicast forwarding as if the packet had just
680 * arrived on the interface to which we are about
681 * to send. The multicast forwarding function
682 * recursively calls this function, using the
683 * IPV6_FORWARDING flag to prevent infinite recursion.
685 * Multicasts that are looped back by ip6_mloopback(),
686 * above, will be forwarded by the ip6_input() routine,
689 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
691 * XXX: ip6_mforward expects that rcvif is NULL
692 * when it is called from the originating path.
693 * However, it may not always be the case.
695 m->m_pkthdr.rcvif = NULL;
696 if (ip6_mforward(ip6, ifp, m) != 0) {
703 * Multicasts with a hoplimit of zero may be looped back,
704 * above, but must not be transmitted on a network.
705 * Also, multicasts addressed to the loopback interface
706 * are not sent -- the above call to ip6_mloopback() will
707 * loop back a copy if this host actually belongs to the
708 * destination group on the loopback interface.
710 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
711 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
718 * Fill the outgoing inteface to tell the upper layer
719 * to increment per-interface statistics.
724 /* Determine path MTU. */
725 if ((error = ip6_getpmtu(ro_pmtu, ro != ro_pmtu, ifp, &ip6->ip6_dst,
726 &mtu, &alwaysfrag, fibnum, *nexthdrp)) != 0)
730 * The caller of this function may specify to use the minimum MTU
732 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
733 * setting. The logic is a bit complicated; by default, unicast
734 * packets will follow path MTU while multicast packets will be sent at
735 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
736 * including unicast ones will be sent at the minimum MTU. Multicast
737 * packets will always be sent at the minimum MTU unless
738 * IP6PO_MINMTU_DISABLE is explicitly specified.
739 * See RFC 3542 for more details.
741 if (mtu > IPV6_MMTU) {
742 if ((flags & IPV6_MINMTU))
744 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
746 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
748 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
754 * clear embedded scope identifiers if necessary.
755 * in6_clearscope will touch the addresses only when necessary.
757 in6_clearscope(&ip6->ip6_src);
758 in6_clearscope(&ip6->ip6_dst);
761 * If the outgoing packet contains a hop-by-hop options header,
762 * it must be examined and processed even by the source node.
763 * (RFC 2460, section 4.)
765 if (exthdrs.ip6e_hbh) {
766 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
767 u_int32_t dummy; /* XXX unused */
768 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
771 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
772 panic("ip6e_hbh is not contiguous");
775 * XXX: if we have to send an ICMPv6 error to the sender,
776 * we need the M_LOOP flag since icmp6_error() expects
777 * the IPv6 and the hop-by-hop options header are
778 * contiguous unless the flag is set.
780 m->m_flags |= M_LOOP;
781 m->m_pkthdr.rcvif = ifp;
782 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
783 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
784 &dummy, &plen) < 0) {
785 /* m was already freed at this point */
786 error = EINVAL;/* better error? */
789 m->m_flags &= ~M_LOOP; /* XXX */
790 m->m_pkthdr.rcvif = NULL;
793 /* Jump over all PFIL processing if hooks are not active. */
794 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
798 /* Run through list of hooks for output packets. */
799 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp);
800 if (error != 0 || m == NULL)
803 ip6 = mtod(m, struct ip6_hdr *);
806 /* See if destination IP address was changed by packet filter. */
807 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
808 m->m_flags |= M_SKIP_FIREWALL;
809 /* If destination is now ourself drop to ip6_input(). */
810 if (in6_localip(&ip6->ip6_dst)) {
811 m->m_flags |= M_FASTFWD_OURS;
812 if (m->m_pkthdr.rcvif == NULL)
813 m->m_pkthdr.rcvif = V_loif;
814 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
815 m->m_pkthdr.csum_flags |=
816 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
817 m->m_pkthdr.csum_data = 0xffff;
820 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
821 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
823 error = netisr_queue(NETISR_IPV6, m);
827 needfiblookup = 1; /* Redo the routing table lookup. */
829 LLE_FREE(ro->ro_lle); /* zeros ro_lle */
833 /* See if fib was changed by packet filter. */
834 if (fibnum != M_GETFIB(m)) {
835 m->m_flags |= M_SKIP_FIREWALL;
836 fibnum = M_GETFIB(m);
840 LLE_FREE(ro->ro_lle); /* zeros ro_lle */
846 /* See if local, if yes, send it to netisr. */
847 if (m->m_flags & M_FASTFWD_OURS) {
848 if (m->m_pkthdr.rcvif == NULL)
849 m->m_pkthdr.rcvif = V_loif;
850 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
851 m->m_pkthdr.csum_flags |=
852 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
853 m->m_pkthdr.csum_data = 0xffff;
856 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
857 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
859 error = netisr_queue(NETISR_IPV6, m);
862 /* Or forward to some other address? */
863 if ((m->m_flags & M_IP6_NEXTHOP) &&
864 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
865 dst = (struct sockaddr_in6 *)&ro->ro_dst;
866 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
867 m->m_flags |= M_SKIP_FIREWALL;
868 m->m_flags &= ~M_IP6_NEXTHOP;
869 m_tag_delete(m, fwd_tag);
875 * Send the packet to the outgoing interface.
876 * If necessary, do IPv6 fragmentation before sending.
878 * the logic here is rather complex:
879 * 1: normal case (dontfrag == 0, alwaysfrag == 0)
880 * 1-a: send as is if tlen <= path mtu
881 * 1-b: fragment if tlen > path mtu
883 * 2: if user asks us not to fragment (dontfrag == 1)
884 * 2-a: send as is if tlen <= interface mtu
885 * 2-b: error if tlen > interface mtu
887 * 3: if we always need to attach fragment header (alwaysfrag == 1)
890 * 4: if dontfrag == 1 && alwaysfrag == 1
891 * error, as we cannot handle this conflicting request
893 sw_csum = m->m_pkthdr.csum_flags;
895 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0;
896 sw_csum &= ~ifp->if_hwassist;
900 * If we added extension headers, we will not do TSO and calculate the
901 * checksums ourselves for now.
902 * XXX-BZ Need a framework to know when the NIC can handle it, even
905 if (sw_csum & CSUM_DELAY_DATA_IPV6) {
906 sw_csum &= ~CSUM_DELAY_DATA_IPV6;
907 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
910 if (sw_csum & CSUM_SCTP_IPV6) {
911 sw_csum &= ~CSUM_SCTP_IPV6;
912 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
915 m->m_pkthdr.csum_flags &= ifp->if_hwassist;
916 tlen = m->m_pkthdr.len;
918 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
922 if (dontfrag && alwaysfrag) { /* case 4 */
923 /* conflicting request - can't transmit */
927 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */
929 * Even if the DONTFRAG option is specified, we cannot send the
930 * packet when the data length is larger than the MTU of the
931 * outgoing interface.
932 * Notify the error by sending IPV6_PATHMTU ancillary data if
933 * application wanted to know the MTU value. Also return an
934 * error code (this is not described in the API spec).
937 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu);
943 * transmit packet without fragmentation
945 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
946 struct in6_ifaddr *ia6;
948 ip6 = mtod(m, struct ip6_hdr *);
949 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
951 /* Record statistics for this interface address. */
952 counter_u64_add(ia6->ia_ifa.ifa_opackets, 1);
953 counter_u64_add(ia6->ia_ifa.ifa_obytes,
955 ifa_free(&ia6->ia_ifa);
957 error = nd6_output_ifp(ifp, origifp, m, dst,
963 * try to fragment the packet. case 1-b and 3
965 if (mtu < IPV6_MMTU) {
966 /* path MTU cannot be less than IPV6_MMTU */
968 in6_ifstat_inc(ifp, ifs6_out_fragfail);
970 } else if (ip6->ip6_plen == 0) {
971 /* jumbo payload cannot be fragmented */
973 in6_ifstat_inc(ifp, ifs6_out_fragfail);
979 * Too large for the destination or interface;
980 * fragment if possible.
981 * Must be able to put at least 8 bytes per fragment.
983 hlen = unfragpartlen;
984 if (mtu > IPV6_MAXPACKET)
985 mtu = IPV6_MAXPACKET;
987 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
990 in6_ifstat_inc(ifp, ifs6_out_fragfail);
995 * If the interface will not calculate checksums on
996 * fragmented packets, then do it here.
997 * XXX-BZ handle the hw offloading case. Need flags.
999 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1000 in6_delayed_cksum(m, plen, hlen);
1001 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
1004 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
1005 sctp_delayed_cksum(m, hlen);
1006 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
1010 * Change the next header field of the last header in the
1011 * unfragmentable part.
1013 if (exthdrs.ip6e_rthdr) {
1014 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
1015 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
1016 } else if (exthdrs.ip6e_dest1) {
1017 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
1018 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
1019 } else if (exthdrs.ip6e_hbh) {
1020 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
1021 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
1023 nextproto = ip6->ip6_nxt;
1024 ip6->ip6_nxt = IPPROTO_FRAGMENT;
1028 * Loop through length of segment after first fragment,
1029 * make new header and copy data of each part and link onto
1033 id = htonl(ip6_randomid());
1034 if ((error = ip6_fragment(ifp, m, hlen, nextproto, len, id)))
1037 in6_ifstat_inc(ifp, ifs6_out_fragok);
1041 * Remove leading garbages.
1047 for (m0 = m; m; m = m0) {
1051 /* Record statistics for this interface address. */
1053 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
1054 counter_u64_add(ia->ia_ifa.ifa_obytes,
1057 error = nd6_output_ifp(ifp, origifp, m, dst,
1058 (struct route *)ro);
1064 IP6STAT_INC(ip6s_fragmented);
1068 * Release the route if using our private route, or if
1069 * (with flowtable) we don't have our own reference.
1071 if (ro == &ip6route ||
1072 (ro != NULL && ro->ro_flags & RT_NORTREF))
1077 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */
1078 m_freem(exthdrs.ip6e_dest1);
1079 m_freem(exthdrs.ip6e_rthdr);
1080 m_freem(exthdrs.ip6e_dest2);
1089 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1093 if (hlen > MCLBYTES)
1094 return (ENOBUFS); /* XXX */
1097 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1099 m = m_get(M_NOWAIT, MT_DATA);
1104 bcopy(hdr, mtod(m, caddr_t), hlen);
1111 * Insert jumbo payload option.
1114 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1120 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */
1123 * If there is no hop-by-hop options header, allocate new one.
1124 * If there is one but it doesn't have enough space to store the
1125 * jumbo payload option, allocate a cluster to store the whole options.
1126 * Otherwise, use it to store the options.
1128 if (exthdrs->ip6e_hbh == NULL) {
1129 mopt = m_get(M_NOWAIT, MT_DATA);
1132 mopt->m_len = JUMBOOPTLEN;
1133 optbuf = mtod(mopt, u_char *);
1134 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */
1135 exthdrs->ip6e_hbh = mopt;
1137 struct ip6_hbh *hbh;
1139 mopt = exthdrs->ip6e_hbh;
1140 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1143 * - exthdrs->ip6e_hbh is not referenced from places
1144 * other than exthdrs.
1145 * - exthdrs->ip6e_hbh is not an mbuf chain.
1147 int oldoptlen = mopt->m_len;
1151 * XXX: give up if the whole (new) hbh header does
1152 * not fit even in an mbuf cluster.
1154 if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1158 * As a consequence, we must always prepare a cluster
1161 n = m_getcl(M_NOWAIT, MT_DATA, 0);
1164 n->m_len = oldoptlen + JUMBOOPTLEN;
1165 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
1167 optbuf = mtod(n, caddr_t) + oldoptlen;
1169 mopt = exthdrs->ip6e_hbh = n;
1171 optbuf = mtod(mopt, u_char *) + mopt->m_len;
1172 mopt->m_len += JUMBOOPTLEN;
1174 optbuf[0] = IP6OPT_PADN;
1178 * Adjust the header length according to the pad and
1179 * the jumbo payload option.
1181 hbh = mtod(mopt, struct ip6_hbh *);
1182 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1185 /* fill in the option. */
1186 optbuf[2] = IP6OPT_JUMBO;
1188 v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1189 bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1191 /* finally, adjust the packet header length */
1192 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1199 * Insert fragment header and copy unfragmentable header portions.
1202 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1203 struct ip6_frag **frghdrp)
1205 struct mbuf *n, *mlast;
1207 if (hlen > sizeof(struct ip6_hdr)) {
1208 n = m_copym(m0, sizeof(struct ip6_hdr),
1209 hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1216 /* Search for the last mbuf of unfragmentable part. */
1217 for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1220 if (M_WRITABLE(mlast) &&
1221 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1222 /* use the trailing space of the last mbuf for the fragment hdr */
1223 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1225 mlast->m_len += sizeof(struct ip6_frag);
1226 m->m_pkthdr.len += sizeof(struct ip6_frag);
1228 /* allocate a new mbuf for the fragment header */
1231 mfrg = m_get(M_NOWAIT, MT_DATA);
1234 mfrg->m_len = sizeof(struct ip6_frag);
1235 *frghdrp = mtod(mfrg, struct ip6_frag *);
1236 mlast->m_next = mfrg;
1243 * Calculates IPv6 path mtu for destination @dst.
1244 * Resulting MTU is stored in @mtup.
1246 * Returns 0 on success.
1249 ip6_getpmtu_ctl(u_int fibnum, const struct in6_addr *dst, u_long *mtup)
1251 struct nhop6_extended nh6;
1252 struct in6_addr kdst;
1258 in6_splitscope(dst, &kdst, &scopeid);
1259 if (fib6_lookup_nh_ext(fibnum, &kdst, scopeid, NHR_REF, 0, &nh6) != 0)
1260 return (EHOSTUNREACH);
1265 error = ip6_calcmtu(ifp, dst, mtu, mtup, NULL, 0);
1266 fib6_free_nh_ext(fibnum, &nh6);
1272 * Calculates IPv6 path MTU for @dst based on transmit @ifp,
1273 * and cached data in @ro_pmtu.
1274 * MTU from (successful) route lookup is saved (along with dst)
1275 * inside @ro_pmtu to avoid subsequent route lookups after packet
1276 * filter processing.
1278 * Stores mtu and always-frag value into @mtup and @alwaysfragp.
1279 * Returns 0 on success.
1282 ip6_getpmtu(struct route_in6 *ro_pmtu, int do_lookup,
1283 struct ifnet *ifp, const struct in6_addr *dst, u_long *mtup,
1284 int *alwaysfragp, u_int fibnum, u_int proto)
1286 struct nhop6_basic nh6;
1287 struct in6_addr kdst;
1289 struct sockaddr_in6 *sa6_dst;
1296 * Here ro_pmtu has final destination address, while
1297 * ro might represent immediate destination.
1298 * Use ro_pmtu destination since mtu might differ.
1300 sa6_dst = (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1301 if (!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))
1302 ro_pmtu->ro_mtu = 0;
1304 if (ro_pmtu->ro_mtu == 0) {
1305 bzero(sa6_dst, sizeof(*sa6_dst));
1306 sa6_dst->sin6_family = AF_INET6;
1307 sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1308 sa6_dst->sin6_addr = *dst;
1310 in6_splitscope(dst, &kdst, &scopeid);
1311 if (fib6_lookup_nh_basic(fibnum, &kdst, scopeid, 0, 0,
1313 ro_pmtu->ro_mtu = nh6.nh_mtu;
1316 mtu = ro_pmtu->ro_mtu;
1320 mtu = ro_pmtu->ro_rt->rt_mtu;
1322 return (ip6_calcmtu(ifp, dst, mtu, mtup, alwaysfragp, proto));
1326 * Calculate MTU based on transmit @ifp, route mtu @rt_mtu and
1327 * hostcache data for @dst.
1328 * Stores mtu and always-frag value into @mtup and @alwaysfragp.
1330 * Returns 0 on success.
1333 ip6_calcmtu(struct ifnet *ifp, const struct in6_addr *dst, u_long rt_mtu,
1334 u_long *mtup, int *alwaysfragp, u_int proto)
1342 struct in_conninfo inc;
1344 bzero(&inc, sizeof(inc));
1345 inc.inc_flags |= INC_ISIPV6;
1346 inc.inc6_faddr = *dst;
1348 ifmtu = IN6_LINKMTU(ifp);
1350 /* TCP is known to react to pmtu changes so skip hc */
1351 if (proto != IPPROTO_TCP)
1352 mtu = tcp_hc_getmtu(&inc);
1355 mtu = min(mtu, rt_mtu);
1360 else if (mtu < IPV6_MMTU) {
1362 * RFC2460 section 5, last paragraph:
1363 * if we record ICMPv6 too big message with
1364 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1365 * or smaller, with framgent header attached.
1366 * (fragment header is needed regardless from the
1367 * packet size, for translators to identify packets)
1373 mtu = IN6_LINKMTU(ifp);
1375 error = EHOSTUNREACH; /* XXX */
1379 *alwaysfragp = alwaysfrag;
1384 * IP6 socket option processing.
1387 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1389 int optdatalen, uproto;
1391 struct inpcb *in6p = sotoinpcb(so);
1393 int level, op, optname;
1397 uint32_t rss_bucket;
1401 level = sopt->sopt_level;
1402 op = sopt->sopt_dir;
1403 optname = sopt->sopt_name;
1404 optlen = sopt->sopt_valsize;
1408 uproto = (int)so->so_proto->pr_protocol;
1410 if (level != IPPROTO_IPV6) {
1413 if (sopt->sopt_level == SOL_SOCKET &&
1414 sopt->sopt_dir == SOPT_SET) {
1415 switch (sopt->sopt_name) {
1418 if ((so->so_options & SO_REUSEADDR) != 0)
1419 in6p->inp_flags2 |= INP_REUSEADDR;
1421 in6p->inp_flags2 &= ~INP_REUSEADDR;
1427 if ((so->so_options & SO_REUSEPORT) != 0)
1428 in6p->inp_flags2 |= INP_REUSEPORT;
1430 in6p->inp_flags2 &= ~INP_REUSEPORT;
1436 in6p->inp_inc.inc_fibnum = so->so_fibnum;
1444 } else { /* level == IPPROTO_IPV6 */
1449 case IPV6_2292PKTOPTIONS:
1450 #ifdef IPV6_PKTOPTIONS
1451 case IPV6_PKTOPTIONS:
1456 error = soopt_getm(sopt, &m); /* XXX */
1459 error = soopt_mcopyin(sopt, m); /* XXX */
1462 error = ip6_pcbopts(&in6p->in6p_outputopts,
1464 m_freem(m); /* XXX */
1469 * Use of some Hop-by-Hop options or some
1470 * Destination options, might require special
1471 * privilege. That is, normal applications
1472 * (without special privilege) might be forbidden
1473 * from setting certain options in outgoing packets,
1474 * and might never see certain options in received
1475 * packets. [RFC 2292 Section 6]
1476 * KAME specific note:
1477 * KAME prevents non-privileged users from sending or
1478 * receiving ANY hbh/dst options in order to avoid
1479 * overhead of parsing options in the kernel.
1481 case IPV6_RECVHOPOPTS:
1482 case IPV6_RECVDSTOPTS:
1483 case IPV6_RECVRTHDRDSTOPTS:
1485 error = priv_check(td,
1486 PRIV_NETINET_SETHDROPTS);
1491 case IPV6_UNICAST_HOPS:
1494 case IPV6_RECVPKTINFO:
1495 case IPV6_RECVHOPLIMIT:
1496 case IPV6_RECVRTHDR:
1497 case IPV6_RECVPATHMTU:
1498 case IPV6_RECVTCLASS:
1499 case IPV6_RECVFLOWID:
1501 case IPV6_RECVRSSBUCKETID:
1504 case IPV6_AUTOFLOWLABEL:
1506 case IPV6_BINDMULTI:
1508 case IPV6_RSS_LISTEN_BUCKET:
1510 if (optname == IPV6_BINDANY && td != NULL) {
1511 error = priv_check(td,
1512 PRIV_NETINET_BINDANY);
1517 if (optlen != sizeof(int)) {
1521 error = sooptcopyin(sopt, &optval,
1522 sizeof optval, sizeof optval);
1527 case IPV6_UNICAST_HOPS:
1528 if (optval < -1 || optval >= 256)
1531 /* -1 = kernel default */
1532 in6p->in6p_hops = optval;
1533 if ((in6p->inp_vflag &
1535 in6p->inp_ip_ttl = optval;
1538 #define OPTSET(bit) \
1542 in6p->inp_flags |= (bit); \
1544 in6p->inp_flags &= ~(bit); \
1545 INP_WUNLOCK(in6p); \
1546 } while (/*CONSTCOND*/ 0)
1547 #define OPTSET2292(bit) \
1550 in6p->inp_flags |= IN6P_RFC2292; \
1552 in6p->inp_flags |= (bit); \
1554 in6p->inp_flags &= ~(bit); \
1555 INP_WUNLOCK(in6p); \
1556 } while (/*CONSTCOND*/ 0)
1557 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0)
1559 #define OPTSET2(bit, val) do { \
1562 in6p->inp_flags2 |= bit; \
1564 in6p->inp_flags2 &= ~bit; \
1565 INP_WUNLOCK(in6p); \
1567 #define OPTBIT2(bit) (in6p->inp_flags2 & (bit) ? 1 : 0)
1569 case IPV6_RECVPKTINFO:
1570 /* cannot mix with RFC2292 */
1571 if (OPTBIT(IN6P_RFC2292)) {
1575 OPTSET(IN6P_PKTINFO);
1580 struct ip6_pktopts **optp;
1582 /* cannot mix with RFC2292 */
1583 if (OPTBIT(IN6P_RFC2292)) {
1587 optp = &in6p->in6p_outputopts;
1588 error = ip6_pcbopt(IPV6_HOPLIMIT,
1589 (u_char *)&optval, sizeof(optval),
1590 optp, (td != NULL) ? td->td_ucred :
1595 case IPV6_RECVHOPLIMIT:
1596 /* cannot mix with RFC2292 */
1597 if (OPTBIT(IN6P_RFC2292)) {
1601 OPTSET(IN6P_HOPLIMIT);
1604 case IPV6_RECVHOPOPTS:
1605 /* cannot mix with RFC2292 */
1606 if (OPTBIT(IN6P_RFC2292)) {
1610 OPTSET(IN6P_HOPOPTS);
1613 case IPV6_RECVDSTOPTS:
1614 /* cannot mix with RFC2292 */
1615 if (OPTBIT(IN6P_RFC2292)) {
1619 OPTSET(IN6P_DSTOPTS);
1622 case IPV6_RECVRTHDRDSTOPTS:
1623 /* cannot mix with RFC2292 */
1624 if (OPTBIT(IN6P_RFC2292)) {
1628 OPTSET(IN6P_RTHDRDSTOPTS);
1631 case IPV6_RECVRTHDR:
1632 /* cannot mix with RFC2292 */
1633 if (OPTBIT(IN6P_RFC2292)) {
1640 case IPV6_RECVPATHMTU:
1642 * We ignore this option for TCP
1644 * (RFC3542 leaves this case
1647 if (uproto != IPPROTO_TCP)
1651 case IPV6_RECVFLOWID:
1652 OPTSET2(INP_RECVFLOWID, optval);
1656 case IPV6_RECVRSSBUCKETID:
1657 OPTSET2(INP_RECVRSSBUCKETID, optval);
1663 * make setsockopt(IPV6_V6ONLY)
1664 * available only prior to bind(2).
1665 * see ipng mailing list, Jun 22 2001.
1667 if (in6p->inp_lport ||
1668 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1672 OPTSET(IN6P_IPV6_V6ONLY);
1674 in6p->inp_vflag &= ~INP_IPV4;
1676 in6p->inp_vflag |= INP_IPV4;
1678 case IPV6_RECVTCLASS:
1679 /* cannot mix with RFC2292 XXX */
1680 if (OPTBIT(IN6P_RFC2292)) {
1684 OPTSET(IN6P_TCLASS);
1686 case IPV6_AUTOFLOWLABEL:
1687 OPTSET(IN6P_AUTOFLOWLABEL);
1691 OPTSET(INP_BINDANY);
1694 case IPV6_BINDMULTI:
1695 OPTSET2(INP_BINDMULTI, optval);
1698 case IPV6_RSS_LISTEN_BUCKET:
1699 if ((optval >= 0) &&
1700 (optval < rss_getnumbuckets())) {
1701 in6p->inp_rss_listen_bucket = optval;
1702 OPTSET2(INP_RSS_BUCKET_SET, 1);
1713 case IPV6_USE_MIN_MTU:
1714 case IPV6_PREFER_TEMPADDR:
1715 if (optlen != sizeof(optval)) {
1719 error = sooptcopyin(sopt, &optval,
1720 sizeof optval, sizeof optval);
1724 struct ip6_pktopts **optp;
1725 optp = &in6p->in6p_outputopts;
1726 error = ip6_pcbopt(optname,
1727 (u_char *)&optval, sizeof(optval),
1728 optp, (td != NULL) ? td->td_ucred :
1733 case IPV6_2292PKTINFO:
1734 case IPV6_2292HOPLIMIT:
1735 case IPV6_2292HOPOPTS:
1736 case IPV6_2292DSTOPTS:
1737 case IPV6_2292RTHDR:
1739 if (optlen != sizeof(int)) {
1743 error = sooptcopyin(sopt, &optval,
1744 sizeof optval, sizeof optval);
1748 case IPV6_2292PKTINFO:
1749 OPTSET2292(IN6P_PKTINFO);
1751 case IPV6_2292HOPLIMIT:
1752 OPTSET2292(IN6P_HOPLIMIT);
1754 case IPV6_2292HOPOPTS:
1756 * Check super-user privilege.
1757 * See comments for IPV6_RECVHOPOPTS.
1760 error = priv_check(td,
1761 PRIV_NETINET_SETHDROPTS);
1765 OPTSET2292(IN6P_HOPOPTS);
1767 case IPV6_2292DSTOPTS:
1769 error = priv_check(td,
1770 PRIV_NETINET_SETHDROPTS);
1774 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1776 case IPV6_2292RTHDR:
1777 OPTSET2292(IN6P_RTHDR);
1785 case IPV6_RTHDRDSTOPTS:
1788 /* new advanced API (RFC3542) */
1790 u_char optbuf_storage[MCLBYTES];
1792 struct ip6_pktopts **optp;
1794 /* cannot mix with RFC2292 */
1795 if (OPTBIT(IN6P_RFC2292)) {
1801 * We only ensure valsize is not too large
1802 * here. Further validation will be done
1805 error = sooptcopyin(sopt, optbuf_storage,
1806 sizeof(optbuf_storage), 0);
1809 optlen = sopt->sopt_valsize;
1810 optbuf = optbuf_storage;
1811 optp = &in6p->in6p_outputopts;
1812 error = ip6_pcbopt(optname, optbuf, optlen,
1813 optp, (td != NULL) ? td->td_ucred : NULL,
1819 case IPV6_MULTICAST_IF:
1820 case IPV6_MULTICAST_HOPS:
1821 case IPV6_MULTICAST_LOOP:
1822 case IPV6_JOIN_GROUP:
1823 case IPV6_LEAVE_GROUP:
1825 case MCAST_BLOCK_SOURCE:
1826 case MCAST_UNBLOCK_SOURCE:
1827 case MCAST_JOIN_GROUP:
1828 case MCAST_LEAVE_GROUP:
1829 case MCAST_JOIN_SOURCE_GROUP:
1830 case MCAST_LEAVE_SOURCE_GROUP:
1831 error = ip6_setmoptions(in6p, sopt);
1834 case IPV6_PORTRANGE:
1835 error = sooptcopyin(sopt, &optval,
1836 sizeof optval, sizeof optval);
1842 case IPV6_PORTRANGE_DEFAULT:
1843 in6p->inp_flags &= ~(INP_LOWPORT);
1844 in6p->inp_flags &= ~(INP_HIGHPORT);
1847 case IPV6_PORTRANGE_HIGH:
1848 in6p->inp_flags &= ~(INP_LOWPORT);
1849 in6p->inp_flags |= INP_HIGHPORT;
1852 case IPV6_PORTRANGE_LOW:
1853 in6p->inp_flags &= ~(INP_HIGHPORT);
1854 in6p->inp_flags |= INP_LOWPORT;
1865 case IPV6_IPSEC_POLICY:
1870 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1872 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
1874 req = mtod(m, caddr_t);
1875 error = ipsec_set_policy(in6p, optname, req,
1876 m->m_len, (sopt->sopt_td != NULL) ?
1877 sopt->sopt_td->td_ucred : NULL);
1884 error = ENOPROTOOPT;
1892 case IPV6_2292PKTOPTIONS:
1893 #ifdef IPV6_PKTOPTIONS
1894 case IPV6_PKTOPTIONS:
1897 * RFC3542 (effectively) deprecated the
1898 * semantics of the 2292-style pktoptions.
1899 * Since it was not reliable in nature (i.e.,
1900 * applications had to expect the lack of some
1901 * information after all), it would make sense
1902 * to simplify this part by always returning
1905 sopt->sopt_valsize = 0;
1908 case IPV6_RECVHOPOPTS:
1909 case IPV6_RECVDSTOPTS:
1910 case IPV6_RECVRTHDRDSTOPTS:
1911 case IPV6_UNICAST_HOPS:
1912 case IPV6_RECVPKTINFO:
1913 case IPV6_RECVHOPLIMIT:
1914 case IPV6_RECVRTHDR:
1915 case IPV6_RECVPATHMTU:
1918 case IPV6_PORTRANGE:
1919 case IPV6_RECVTCLASS:
1920 case IPV6_AUTOFLOWLABEL:
1924 case IPV6_RECVFLOWID:
1926 case IPV6_RSSBUCKETID:
1927 case IPV6_RECVRSSBUCKETID:
1929 case IPV6_BINDMULTI:
1932 case IPV6_RECVHOPOPTS:
1933 optval = OPTBIT(IN6P_HOPOPTS);
1936 case IPV6_RECVDSTOPTS:
1937 optval = OPTBIT(IN6P_DSTOPTS);
1940 case IPV6_RECVRTHDRDSTOPTS:
1941 optval = OPTBIT(IN6P_RTHDRDSTOPTS);
1944 case IPV6_UNICAST_HOPS:
1945 optval = in6p->in6p_hops;
1948 case IPV6_RECVPKTINFO:
1949 optval = OPTBIT(IN6P_PKTINFO);
1952 case IPV6_RECVHOPLIMIT:
1953 optval = OPTBIT(IN6P_HOPLIMIT);
1956 case IPV6_RECVRTHDR:
1957 optval = OPTBIT(IN6P_RTHDR);
1960 case IPV6_RECVPATHMTU:
1961 optval = OPTBIT(IN6P_MTU);
1965 optval = OPTBIT(IN6P_IPV6_V6ONLY);
1968 case IPV6_PORTRANGE:
1971 flags = in6p->inp_flags;
1972 if (flags & INP_HIGHPORT)
1973 optval = IPV6_PORTRANGE_HIGH;
1974 else if (flags & INP_LOWPORT)
1975 optval = IPV6_PORTRANGE_LOW;
1980 case IPV6_RECVTCLASS:
1981 optval = OPTBIT(IN6P_TCLASS);
1984 case IPV6_AUTOFLOWLABEL:
1985 optval = OPTBIT(IN6P_AUTOFLOWLABEL);
1989 optval = OPTBIT(INP_BINDANY);
1993 optval = in6p->inp_flowid;
1997 optval = in6p->inp_flowtype;
2000 case IPV6_RECVFLOWID:
2001 optval = OPTBIT2(INP_RECVFLOWID);
2004 case IPV6_RSSBUCKETID:
2006 rss_hash2bucket(in6p->inp_flowid,
2010 optval = rss_bucket;
2015 case IPV6_RECVRSSBUCKETID:
2016 optval = OPTBIT2(INP_RECVRSSBUCKETID);
2020 case IPV6_BINDMULTI:
2021 optval = OPTBIT2(INP_BINDMULTI);
2027 error = sooptcopyout(sopt, &optval,
2034 struct ip6_mtuinfo mtuinfo;
2036 if (!(so->so_state & SS_ISCONNECTED))
2039 * XXX: we dot not consider the case of source
2040 * routing, or optional information to specify
2041 * the outgoing interface.
2043 error = ip6_getpmtu_ctl(so->so_fibnum,
2044 &in6p->in6p_faddr, &pmtu);
2047 if (pmtu > IPV6_MAXPACKET)
2048 pmtu = IPV6_MAXPACKET;
2050 bzero(&mtuinfo, sizeof(mtuinfo));
2051 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
2052 optdata = (void *)&mtuinfo;
2053 optdatalen = sizeof(mtuinfo);
2054 error = sooptcopyout(sopt, optdata,
2059 case IPV6_2292PKTINFO:
2060 case IPV6_2292HOPLIMIT:
2061 case IPV6_2292HOPOPTS:
2062 case IPV6_2292RTHDR:
2063 case IPV6_2292DSTOPTS:
2065 case IPV6_2292PKTINFO:
2066 optval = OPTBIT(IN6P_PKTINFO);
2068 case IPV6_2292HOPLIMIT:
2069 optval = OPTBIT(IN6P_HOPLIMIT);
2071 case IPV6_2292HOPOPTS:
2072 optval = OPTBIT(IN6P_HOPOPTS);
2074 case IPV6_2292RTHDR:
2075 optval = OPTBIT(IN6P_RTHDR);
2077 case IPV6_2292DSTOPTS:
2078 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
2081 error = sooptcopyout(sopt, &optval,
2088 case IPV6_RTHDRDSTOPTS:
2092 case IPV6_USE_MIN_MTU:
2093 case IPV6_PREFER_TEMPADDR:
2094 error = ip6_getpcbopt(in6p->in6p_outputopts,
2098 case IPV6_MULTICAST_IF:
2099 case IPV6_MULTICAST_HOPS:
2100 case IPV6_MULTICAST_LOOP:
2102 error = ip6_getmoptions(in6p, sopt);
2106 case IPV6_IPSEC_POLICY:
2110 struct mbuf *m = NULL;
2111 struct mbuf **mp = &m;
2112 size_t ovalsize = sopt->sopt_valsize;
2113 caddr_t oval = (caddr_t)sopt->sopt_val;
2115 error = soopt_getm(sopt, &m); /* XXX */
2118 error = soopt_mcopyin(sopt, m); /* XXX */
2121 sopt->sopt_valsize = ovalsize;
2122 sopt->sopt_val = oval;
2124 req = mtod(m, caddr_t);
2127 error = ipsec_get_policy(in6p, req, len, mp);
2129 error = soopt_mcopyout(sopt, m); /* XXX */
2130 if (error == 0 && m)
2137 error = ENOPROTOOPT;
2147 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2149 int error = 0, optval, optlen;
2150 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2151 struct inpcb *in6p = sotoinpcb(so);
2152 int level, op, optname;
2154 level = sopt->sopt_level;
2155 op = sopt->sopt_dir;
2156 optname = sopt->sopt_name;
2157 optlen = sopt->sopt_valsize;
2159 if (level != IPPROTO_IPV6) {
2166 * For ICMPv6 sockets, no modification allowed for checksum
2167 * offset, permit "no change" values to help existing apps.
2169 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2170 * for an ICMPv6 socket will fail."
2171 * The current behavior does not meet RFC3542.
2175 if (optlen != sizeof(int)) {
2179 error = sooptcopyin(sopt, &optval, sizeof(optval),
2183 if ((optval % 2) != 0) {
2184 /* the API assumes even offset values */
2186 } else if (so->so_proto->pr_protocol ==
2188 if (optval != icmp6off)
2191 in6p->in6p_cksum = optval;
2195 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
2198 optval = in6p->in6p_cksum;
2200 error = sooptcopyout(sopt, &optval, sizeof(optval));
2210 error = ENOPROTOOPT;
2218 * Set up IP6 options in pcb for insertion in output packets or
2219 * specifying behavior of outgoing packets.
2222 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2223 struct socket *so, struct sockopt *sopt)
2225 struct ip6_pktopts *opt = *pktopt;
2227 struct thread *td = sopt->sopt_td;
2229 /* turn off any old options. */
2232 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2233 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2234 opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2235 printf("ip6_pcbopts: all specified options are cleared.\n");
2237 ip6_clearpktopts(opt, -1);
2239 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2242 if (!m || m->m_len == 0) {
2244 * Only turning off any previous options, regardless of
2245 * whether the opt is just created or given.
2247 free(opt, M_IP6OPT);
2251 /* set options specified by user. */
2252 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2253 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2254 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2255 free(opt, M_IP6OPT);
2263 * initialize ip6_pktopts. beware that there are non-zero default values in
2267 ip6_initpktopts(struct ip6_pktopts *opt)
2270 bzero(opt, sizeof(*opt));
2271 opt->ip6po_hlim = -1; /* -1 means default hop limit */
2272 opt->ip6po_tclass = -1; /* -1 means default traffic class */
2273 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2274 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2278 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2279 struct ucred *cred, int uproto)
2281 struct ip6_pktopts *opt;
2283 if (*pktopt == NULL) {
2284 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2286 ip6_initpktopts(*pktopt);
2290 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
2294 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt)
2296 void *optdata = NULL;
2298 struct ip6_ext *ip6e;
2300 struct in6_pktinfo null_pktinfo;
2301 int deftclass = 0, on;
2302 int defminmtu = IP6PO_MINMTU_MCASTONLY;
2303 int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2307 optdata = (void *)&null_pktinfo;
2308 if (pktopt && pktopt->ip6po_pktinfo) {
2309 bcopy(pktopt->ip6po_pktinfo, &null_pktinfo,
2310 sizeof(null_pktinfo));
2311 in6_clearscope(&null_pktinfo.ipi6_addr);
2313 /* XXX: we don't have to do this every time... */
2314 bzero(&null_pktinfo, sizeof(null_pktinfo));
2316 optdatalen = sizeof(struct in6_pktinfo);
2319 if (pktopt && pktopt->ip6po_tclass >= 0)
2320 optdata = (void *)&pktopt->ip6po_tclass;
2322 optdata = (void *)&deftclass;
2323 optdatalen = sizeof(int);
2326 if (pktopt && pktopt->ip6po_hbh) {
2327 optdata = (void *)pktopt->ip6po_hbh;
2328 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
2329 optdatalen = (ip6e->ip6e_len + 1) << 3;
2333 if (pktopt && pktopt->ip6po_rthdr) {
2334 optdata = (void *)pktopt->ip6po_rthdr;
2335 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
2336 optdatalen = (ip6e->ip6e_len + 1) << 3;
2339 case IPV6_RTHDRDSTOPTS:
2340 if (pktopt && pktopt->ip6po_dest1) {
2341 optdata = (void *)pktopt->ip6po_dest1;
2342 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
2343 optdatalen = (ip6e->ip6e_len + 1) << 3;
2347 if (pktopt && pktopt->ip6po_dest2) {
2348 optdata = (void *)pktopt->ip6po_dest2;
2349 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
2350 optdatalen = (ip6e->ip6e_len + 1) << 3;
2354 if (pktopt && pktopt->ip6po_nexthop) {
2355 optdata = (void *)pktopt->ip6po_nexthop;
2356 optdatalen = pktopt->ip6po_nexthop->sa_len;
2359 case IPV6_USE_MIN_MTU:
2361 optdata = (void *)&pktopt->ip6po_minmtu;
2363 optdata = (void *)&defminmtu;
2364 optdatalen = sizeof(int);
2367 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2371 optdata = (void *)&on;
2372 optdatalen = sizeof(on);
2374 case IPV6_PREFER_TEMPADDR:
2376 optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
2378 optdata = (void *)&defpreftemp;
2379 optdatalen = sizeof(int);
2381 default: /* should not happen */
2383 panic("ip6_getpcbopt: unexpected option\n");
2385 return (ENOPROTOOPT);
2388 error = sooptcopyout(sopt, optdata, optdatalen);
2394 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2399 if (optname == -1 || optname == IPV6_PKTINFO) {
2400 if (pktopt->ip6po_pktinfo)
2401 free(pktopt->ip6po_pktinfo, M_IP6OPT);
2402 pktopt->ip6po_pktinfo = NULL;
2404 if (optname == -1 || optname == IPV6_HOPLIMIT)
2405 pktopt->ip6po_hlim = -1;
2406 if (optname == -1 || optname == IPV6_TCLASS)
2407 pktopt->ip6po_tclass = -1;
2408 if (optname == -1 || optname == IPV6_NEXTHOP) {
2409 if (pktopt->ip6po_nextroute.ro_rt) {
2410 RTFREE(pktopt->ip6po_nextroute.ro_rt);
2411 pktopt->ip6po_nextroute.ro_rt = NULL;
2413 if (pktopt->ip6po_nexthop)
2414 free(pktopt->ip6po_nexthop, M_IP6OPT);
2415 pktopt->ip6po_nexthop = NULL;
2417 if (optname == -1 || optname == IPV6_HOPOPTS) {
2418 if (pktopt->ip6po_hbh)
2419 free(pktopt->ip6po_hbh, M_IP6OPT);
2420 pktopt->ip6po_hbh = NULL;
2422 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2423 if (pktopt->ip6po_dest1)
2424 free(pktopt->ip6po_dest1, M_IP6OPT);
2425 pktopt->ip6po_dest1 = NULL;
2427 if (optname == -1 || optname == IPV6_RTHDR) {
2428 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2429 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2430 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2431 if (pktopt->ip6po_route.ro_rt) {
2432 RTFREE(pktopt->ip6po_route.ro_rt);
2433 pktopt->ip6po_route.ro_rt = NULL;
2436 if (optname == -1 || optname == IPV6_DSTOPTS) {
2437 if (pktopt->ip6po_dest2)
2438 free(pktopt->ip6po_dest2, M_IP6OPT);
2439 pktopt->ip6po_dest2 = NULL;
2443 #define PKTOPT_EXTHDRCPY(type) \
2446 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2447 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2448 if (dst->type == NULL && canwait == M_NOWAIT)\
2450 bcopy(src->type, dst->type, hlen);\
2452 } while (/*CONSTCOND*/ 0)
2455 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2457 if (dst == NULL || src == NULL) {
2458 printf("ip6_clearpktopts: invalid argument\n");
2462 dst->ip6po_hlim = src->ip6po_hlim;
2463 dst->ip6po_tclass = src->ip6po_tclass;
2464 dst->ip6po_flags = src->ip6po_flags;
2465 dst->ip6po_minmtu = src->ip6po_minmtu;
2466 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2467 if (src->ip6po_pktinfo) {
2468 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2470 if (dst->ip6po_pktinfo == NULL)
2472 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2474 if (src->ip6po_nexthop) {
2475 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2477 if (dst->ip6po_nexthop == NULL)
2479 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2480 src->ip6po_nexthop->sa_len);
2482 PKTOPT_EXTHDRCPY(ip6po_hbh);
2483 PKTOPT_EXTHDRCPY(ip6po_dest1);
2484 PKTOPT_EXTHDRCPY(ip6po_dest2);
2485 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2489 ip6_clearpktopts(dst, -1);
2492 #undef PKTOPT_EXTHDRCPY
2494 struct ip6_pktopts *
2495 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2498 struct ip6_pktopts *dst;
2500 dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2503 ip6_initpktopts(dst);
2505 if ((error = copypktopts(dst, src, canwait)) != 0) {
2506 free(dst, M_IP6OPT);
2514 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2519 ip6_clearpktopts(pktopt, -1);
2521 free(pktopt, M_IP6OPT);
2525 * Set IPv6 outgoing packet options based on advanced API.
2528 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2529 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2531 struct cmsghdr *cm = NULL;
2533 if (control == NULL || opt == NULL)
2536 ip6_initpktopts(opt);
2541 * If stickyopt is provided, make a local copy of the options
2542 * for this particular packet, then override them by ancillary
2544 * XXX: copypktopts() does not copy the cached route to a next
2545 * hop (if any). This is not very good in terms of efficiency,
2546 * but we can allow this since this option should be rarely
2549 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2554 * XXX: Currently, we assume all the optional information is stored
2557 if (control->m_next)
2560 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2561 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2564 if (control->m_len < CMSG_LEN(0))
2567 cm = mtod(control, struct cmsghdr *);
2568 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2570 if (cm->cmsg_level != IPPROTO_IPV6)
2573 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2574 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2583 * Set a particular packet option, as a sticky option or an ancillary data
2584 * item. "len" can be 0 only when it's a sticky option.
2585 * We have 4 cases of combination of "sticky" and "cmsg":
2586 * "sticky=0, cmsg=0": impossible
2587 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2588 * "sticky=1, cmsg=0": RFC3542 socket option
2589 * "sticky=1, cmsg=1": RFC2292 socket option
2592 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2593 struct ucred *cred, int sticky, int cmsg, int uproto)
2595 int minmtupolicy, preftemp;
2598 if (!sticky && !cmsg) {
2600 printf("ip6_setpktopt: impossible case\n");
2606 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2607 * not be specified in the context of RFC3542. Conversely,
2608 * RFC3542 types should not be specified in the context of RFC2292.
2612 case IPV6_2292PKTINFO:
2613 case IPV6_2292HOPLIMIT:
2614 case IPV6_2292NEXTHOP:
2615 case IPV6_2292HOPOPTS:
2616 case IPV6_2292DSTOPTS:
2617 case IPV6_2292RTHDR:
2618 case IPV6_2292PKTOPTIONS:
2619 return (ENOPROTOOPT);
2622 if (sticky && cmsg) {
2629 case IPV6_RTHDRDSTOPTS:
2631 case IPV6_USE_MIN_MTU:
2634 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2635 return (ENOPROTOOPT);
2640 case IPV6_2292PKTINFO:
2643 struct ifnet *ifp = NULL;
2644 struct in6_pktinfo *pktinfo;
2646 if (len != sizeof(struct in6_pktinfo))
2649 pktinfo = (struct in6_pktinfo *)buf;
2652 * An application can clear any sticky IPV6_PKTINFO option by
2653 * doing a "regular" setsockopt with ipi6_addr being
2654 * in6addr_any and ipi6_ifindex being zero.
2655 * [RFC 3542, Section 6]
2657 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2658 pktinfo->ipi6_ifindex == 0 &&
2659 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2660 ip6_clearpktopts(opt, optname);
2664 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2665 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2668 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr))
2670 /* validate the interface index if specified. */
2671 if (pktinfo->ipi6_ifindex > V_if_index)
2673 if (pktinfo->ipi6_ifindex) {
2674 ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2678 if (ifp != NULL && (ifp->if_afdata[AF_INET6] == NULL ||
2679 (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) != 0))
2683 !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2684 struct in6_ifaddr *ia;
2686 in6_setscope(&pktinfo->ipi6_addr, ifp, NULL);
2687 ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr);
2689 return (EADDRNOTAVAIL);
2690 ifa_free(&ia->ia_ifa);
2693 * We store the address anyway, and let in6_selectsrc()
2694 * validate the specified address. This is because ipi6_addr
2695 * may not have enough information about its scope zone, and
2696 * we may need additional information (such as outgoing
2697 * interface or the scope zone of a destination address) to
2698 * disambiguate the scope.
2699 * XXX: the delay of the validation may confuse the
2700 * application when it is used as a sticky option.
2702 if (opt->ip6po_pktinfo == NULL) {
2703 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2704 M_IP6OPT, M_NOWAIT);
2705 if (opt->ip6po_pktinfo == NULL)
2708 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2712 case IPV6_2292HOPLIMIT:
2718 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2719 * to simplify the ordering among hoplimit options.
2721 if (optname == IPV6_HOPLIMIT && sticky)
2722 return (ENOPROTOOPT);
2724 if (len != sizeof(int))
2727 if (*hlimp < -1 || *hlimp > 255)
2730 opt->ip6po_hlim = *hlimp;
2738 if (len != sizeof(int))
2740 tclass = *(int *)buf;
2741 if (tclass < -1 || tclass > 255)
2744 opt->ip6po_tclass = tclass;
2748 case IPV6_2292NEXTHOP:
2751 error = priv_check_cred(cred,
2752 PRIV_NETINET_SETHDROPTS, 0);
2757 if (len == 0) { /* just remove the option */
2758 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2762 /* check if cmsg_len is large enough for sa_len */
2763 if (len < sizeof(struct sockaddr) || len < *buf)
2766 switch (((struct sockaddr *)buf)->sa_family) {
2769 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
2772 if (sa6->sin6_len != sizeof(struct sockaddr_in6))
2775 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
2776 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
2779 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
2785 case AF_LINK: /* should eventually be supported */
2787 return (EAFNOSUPPORT);
2790 /* turn off the previous option, then set the new option. */
2791 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2792 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
2793 if (opt->ip6po_nexthop == NULL)
2795 bcopy(buf, opt->ip6po_nexthop, *buf);
2798 case IPV6_2292HOPOPTS:
2801 struct ip6_hbh *hbh;
2805 * XXX: We don't allow a non-privileged user to set ANY HbH
2806 * options, since per-option restriction has too much
2810 error = priv_check_cred(cred,
2811 PRIV_NETINET_SETHDROPTS, 0);
2817 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2818 break; /* just remove the option */
2821 /* message length validation */
2822 if (len < sizeof(struct ip6_hbh))
2824 hbh = (struct ip6_hbh *)buf;
2825 hbhlen = (hbh->ip6h_len + 1) << 3;
2829 /* turn off the previous option, then set the new option. */
2830 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2831 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
2832 if (opt->ip6po_hbh == NULL)
2834 bcopy(hbh, opt->ip6po_hbh, hbhlen);
2839 case IPV6_2292DSTOPTS:
2841 case IPV6_RTHDRDSTOPTS:
2843 struct ip6_dest *dest, **newdest = NULL;
2846 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
2847 error = priv_check_cred(cred,
2848 PRIV_NETINET_SETHDROPTS, 0);
2854 ip6_clearpktopts(opt, optname);
2855 break; /* just remove the option */
2858 /* message length validation */
2859 if (len < sizeof(struct ip6_dest))
2861 dest = (struct ip6_dest *)buf;
2862 destlen = (dest->ip6d_len + 1) << 3;
2867 * Determine the position that the destination options header
2868 * should be inserted; before or after the routing header.
2871 case IPV6_2292DSTOPTS:
2873 * The old advacned API is ambiguous on this point.
2874 * Our approach is to determine the position based
2875 * according to the existence of a routing header.
2876 * Note, however, that this depends on the order of the
2877 * extension headers in the ancillary data; the 1st
2878 * part of the destination options header must appear
2879 * before the routing header in the ancillary data,
2881 * RFC3542 solved the ambiguity by introducing
2882 * separate ancillary data or option types.
2884 if (opt->ip6po_rthdr == NULL)
2885 newdest = &opt->ip6po_dest1;
2887 newdest = &opt->ip6po_dest2;
2889 case IPV6_RTHDRDSTOPTS:
2890 newdest = &opt->ip6po_dest1;
2893 newdest = &opt->ip6po_dest2;
2897 /* turn off the previous option, then set the new option. */
2898 ip6_clearpktopts(opt, optname);
2899 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
2900 if (*newdest == NULL)
2902 bcopy(dest, *newdest, destlen);
2907 case IPV6_2292RTHDR:
2910 struct ip6_rthdr *rth;
2914 ip6_clearpktopts(opt, IPV6_RTHDR);
2915 break; /* just remove the option */
2918 /* message length validation */
2919 if (len < sizeof(struct ip6_rthdr))
2921 rth = (struct ip6_rthdr *)buf;
2922 rthlen = (rth->ip6r_len + 1) << 3;
2926 switch (rth->ip6r_type) {
2927 case IPV6_RTHDR_TYPE_0:
2928 if (rth->ip6r_len == 0) /* must contain one addr */
2930 if (rth->ip6r_len % 2) /* length must be even */
2932 if (rth->ip6r_len / 2 != rth->ip6r_segleft)
2936 return (EINVAL); /* not supported */
2939 /* turn off the previous option */
2940 ip6_clearpktopts(opt, IPV6_RTHDR);
2941 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
2942 if (opt->ip6po_rthdr == NULL)
2944 bcopy(rth, opt->ip6po_rthdr, rthlen);
2949 case IPV6_USE_MIN_MTU:
2950 if (len != sizeof(int))
2952 minmtupolicy = *(int *)buf;
2953 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
2954 minmtupolicy != IP6PO_MINMTU_DISABLE &&
2955 minmtupolicy != IP6PO_MINMTU_ALL) {
2958 opt->ip6po_minmtu = minmtupolicy;
2962 if (len != sizeof(int))
2965 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
2967 * we ignore this option for TCP sockets.
2968 * (RFC3542 leaves this case unspecified.)
2970 opt->ip6po_flags &= ~IP6PO_DONTFRAG;
2972 opt->ip6po_flags |= IP6PO_DONTFRAG;
2975 case IPV6_PREFER_TEMPADDR:
2976 if (len != sizeof(int))
2978 preftemp = *(int *)buf;
2979 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
2980 preftemp != IP6PO_TEMPADDR_NOTPREFER &&
2981 preftemp != IP6PO_TEMPADDR_PREFER) {
2984 opt->ip6po_prefer_tempaddr = preftemp;
2988 return (ENOPROTOOPT);
2989 } /* end of switch */
2995 * Routine called from ip6_output() to loop back a copy of an IP6 multicast
2996 * packet to the input queue of a specified interface. Note that this
2997 * calls the output routine of the loopback "driver", but with an interface
2998 * pointer that might NOT be &loif -- easier than replicating that code here.
3001 ip6_mloopback(struct ifnet *ifp, struct mbuf *m)
3004 struct ip6_hdr *ip6;
3006 copym = m_copy(m, 0, M_COPYALL);
3011 * Make sure to deep-copy IPv6 header portion in case the data
3012 * is in an mbuf cluster, so that we can safely override the IPv6
3013 * header portion later.
3015 if (!M_WRITABLE(copym) ||
3016 copym->m_len < sizeof(struct ip6_hdr)) {
3017 copym = m_pullup(copym, sizeof(struct ip6_hdr));
3021 ip6 = mtod(copym, struct ip6_hdr *);
3023 * clear embedded scope identifiers if necessary.
3024 * in6_clearscope will touch the addresses only when necessary.
3026 in6_clearscope(&ip6->ip6_src);
3027 in6_clearscope(&ip6->ip6_dst);
3028 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
3029 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 |
3031 copym->m_pkthdr.csum_data = 0xffff;
3033 if_simloop(ifp, copym, AF_INET6, 0);
3037 * Chop IPv6 header off from the payload.
3040 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
3043 struct ip6_hdr *ip6;
3045 ip6 = mtod(m, struct ip6_hdr *);
3046 if (m->m_len > sizeof(*ip6)) {
3047 mh = m_gethdr(M_NOWAIT, MT_DATA);
3052 m_move_pkthdr(mh, m);
3053 M_ALIGN(mh, sizeof(*ip6));
3054 m->m_len -= sizeof(*ip6);
3055 m->m_data += sizeof(*ip6);
3058 m->m_len = sizeof(*ip6);
3059 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
3061 exthdrs->ip6e_ip6 = m;
3066 * Compute IPv6 extension header length.
3069 ip6_optlen(struct inpcb *in6p)
3073 if (!in6p->in6p_outputopts)
3078 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
3080 len += elen(in6p->in6p_outputopts->ip6po_hbh);
3081 if (in6p->in6p_outputopts->ip6po_rthdr)
3082 /* dest1 is valid with rthdr only */
3083 len += elen(in6p->in6p_outputopts->ip6po_dest1);
3084 len += elen(in6p->in6p_outputopts->ip6po_rthdr);
3085 len += elen(in6p->in6p_outputopts->ip6po_dest2);