2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $
33 * Copyright (c) 1982, 1986, 1988, 1990, 1993
34 * The Regents of the University of California. All rights reserved.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD$");
67 #include "opt_inet6.h"
69 #include "opt_ipsec.h"
71 #include "opt_route.h"
74 #include <sys/param.h>
75 #include <sys/kernel.h>
76 #include <sys/malloc.h>
78 #include <sys/errno.h>
81 #include <sys/protosw.h>
82 #include <sys/socket.h>
83 #include <sys/socketvar.h>
84 #include <sys/syslog.h>
85 #include <sys/ucred.h>
87 #include <machine/in_cksum.h>
90 #include <net/if_var.h>
91 #include <net/netisr.h>
92 #include <net/route.h>
96 #include <netinet/in.h>
97 #include <netinet/in_var.h>
98 #include <netinet/ip_var.h>
99 #include <netinet6/in6_var.h>
100 #include <netinet/ip6.h>
101 #include <netinet/icmp6.h>
102 #include <netinet6/ip6_var.h>
103 #include <netinet/in_pcb.h>
104 #include <netinet/tcp_var.h>
105 #include <netinet6/nd6.h>
106 #include <netinet/in_rss.h>
109 #include <netipsec/ipsec.h>
110 #include <netipsec/ipsec6.h>
111 #include <netipsec/key.h>
112 #include <netinet6/ip6_ipsec.h>
115 #include <netinet/sctp.h>
116 #include <netinet/sctp_crc32.h>
119 #include <netinet6/ip6protosw.h>
120 #include <netinet6/scope6_var.h>
123 #include <net/flowtable.h>
126 extern int in6_mcast_loop;
129 struct mbuf *ip6e_ip6;
130 struct mbuf *ip6e_hbh;
131 struct mbuf *ip6e_dest1;
132 struct mbuf *ip6e_rthdr;
133 struct mbuf *ip6e_dest2;
136 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **,
137 struct ucred *, int);
138 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *,
139 struct socket *, struct sockopt *);
140 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *);
141 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *,
142 struct ucred *, int, int, int);
144 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
145 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
147 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
148 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
149 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *,
150 struct ifnet *, struct in6_addr *, u_long *, int *, u_int);
151 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
155 * Make an extension header from option data. hp is the source, and
156 * mp is the destination.
158 #define MAKE_EXTHDR(hp, mp) \
161 struct ip6_ext *eh = (struct ip6_ext *)(hp); \
162 error = ip6_copyexthdr((mp), (caddr_t)(hp), \
163 ((eh)->ip6e_len + 1) << 3); \
167 } while (/*CONSTCOND*/ 0)
170 * Form a chain of extension headers.
171 * m is the extension header mbuf
172 * mp is the previous mbuf in the chain
173 * p is the next header
174 * i is the type of option.
176 #define MAKE_CHAIN(m, mp, p, i)\
180 panic("assumption failed: hdr not split"); \
181 *mtod((m), u_char *) = *(p);\
183 p = mtod((m), u_char *);\
184 (m)->m_next = (mp)->m_next;\
188 } while (/*CONSTCOND*/ 0)
191 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
195 csum = in_cksum_skip(m, offset + plen, offset);
196 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
198 offset += m->m_pkthdr.csum_data; /* checksum offset */
200 if (offset + sizeof(u_short) > m->m_len) {
201 printf("%s: delayed m_pullup, m->len: %d plen %u off %u "
202 "csum_flags=%b\n", __func__, m->m_len, plen, offset,
203 (int)m->m_pkthdr.csum_flags, CSUM_BITS);
205 * XXX this should not happen, but if it does, the correct
206 * behavior may be to insert the checksum in the appropriate
207 * next mbuf in the chain.
211 *(u_short *)(m->m_data + offset) = csum;
215 * IP6 output. The packet in mbuf chain m contains a skeletal IP6
216 * header (with pri, len, nxt, hlim, src, dst).
217 * This function may modify ver and hlim only.
218 * The mbuf chain containing the packet will be freed.
219 * The mbuf opt, if present, will not be freed.
220 * If route_in6 ro is present and has ro_rt initialized, route lookup would be
221 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
222 * then result of route lookup is stored in ro->ro_rt.
224 * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and
225 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one,
228 * ifpp - XXX: just for statistics
231 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
232 struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
233 struct ifnet **ifpp, struct inpcb *inp)
235 struct ip6_hdr *ip6, *mhip6;
236 struct ifnet *ifp, *origifp;
238 struct mbuf *mprev = NULL;
239 int hlen, tlen, len, off;
240 struct route_in6 ip6route;
241 struct rtentry *rt = NULL;
242 struct sockaddr_in6 *dst, src_sa, dst_sa;
243 struct in6_addr odst;
245 struct in6_ifaddr *ia = NULL;
247 int alwaysfrag, dontfrag;
248 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
249 struct ip6_exthdrs exthdrs;
250 struct in6_addr finaldst, src0, dst0;
252 struct route_in6 *ro_pmtu = NULL;
255 struct m_tag *fwd_tag = NULL;
257 ip6 = mtod(m, struct ip6_hdr *);
259 printf ("ip6 is NULL");
264 M_SETFIB(m, inp->inp_inc.inc_fibnum);
266 finaldst = ip6->ip6_dst;
267 bzero(&exthdrs, sizeof(exthdrs));
269 /* Hop-by-Hop options header */
270 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
271 /* Destination options header(1st part) */
272 if (opt->ip6po_rthdr) {
274 * Destination options header(1st part)
275 * This only makes sense with a routing header.
276 * See Section 9.2 of RFC 3542.
277 * Disabling this part just for MIP6 convenience is
278 * a bad idea. We need to think carefully about a
279 * way to make the advanced API coexist with MIP6
280 * options, which might automatically be inserted in
283 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
286 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
287 /* Destination options header(2nd part) */
288 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
293 * IPSec checking which handles several cases.
294 * FAST IPSEC: We re-injected the packet.
296 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp))
298 case 1: /* Bad packet */
300 case -1: /* IPSec done */
302 case 0: /* No IPSec */
309 * Calculate the total length of the extension header chain.
310 * Keep the length of the unfragmentable part for fragmentation.
313 if (exthdrs.ip6e_hbh)
314 optlen += exthdrs.ip6e_hbh->m_len;
315 if (exthdrs.ip6e_dest1)
316 optlen += exthdrs.ip6e_dest1->m_len;
317 if (exthdrs.ip6e_rthdr)
318 optlen += exthdrs.ip6e_rthdr->m_len;
319 unfragpartlen = optlen + sizeof(struct ip6_hdr);
321 /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */
322 if (exthdrs.ip6e_dest2)
323 optlen += exthdrs.ip6e_dest2->m_len;
326 * If there is at least one extension header,
327 * separate IP6 header from the payload.
329 if (optlen && !hdrsplit) {
330 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
334 m = exthdrs.ip6e_ip6;
339 ip6 = mtod(m, struct ip6_hdr *);
341 /* adjust mbuf packet header length */
342 m->m_pkthdr.len += optlen;
343 plen = m->m_pkthdr.len - sizeof(*ip6);
345 /* If this is a jumbo payload, insert a jumbo payload option. */
346 if (plen > IPV6_MAXPACKET) {
348 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
352 m = exthdrs.ip6e_ip6;
356 ip6 = mtod(m, struct ip6_hdr *);
357 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
361 ip6->ip6_plen = htons(plen);
364 * Concatenate headers and fill in next header fields.
365 * Here we have, on "m"
367 * and we insert headers accordingly. Finally, we should be getting:
368 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
370 * during the header composing process, "m" points to IPv6 header.
371 * "mprev" points to an extension header prior to esp.
373 u_char *nexthdrp = &ip6->ip6_nxt;
377 * we treat dest2 specially. this makes IPsec processing
378 * much easier. the goal here is to make mprev point the
379 * mbuf prior to dest2.
381 * result: IPv6 dest2 payload
382 * m and mprev will point to IPv6 header.
384 if (exthdrs.ip6e_dest2) {
386 panic("assumption failed: hdr not split");
387 exthdrs.ip6e_dest2->m_next = m->m_next;
388 m->m_next = exthdrs.ip6e_dest2;
389 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
390 ip6->ip6_nxt = IPPROTO_DSTOPTS;
394 * result: IPv6 hbh dest1 rthdr dest2 payload
395 * m will point to IPv6 header. mprev will point to the
396 * extension header prior to dest2 (rthdr in the above case).
398 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
399 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
401 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
405 * If there is a routing header, discard the packet.
407 if (exthdrs.ip6e_rthdr) {
412 /* Source address validation */
413 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
414 (flags & IPV6_UNSPECSRC) == 0) {
416 IP6STAT_INC(ip6s_badscope);
419 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
421 IP6STAT_INC(ip6s_badscope);
425 IP6STAT_INC(ip6s_localout);
432 bzero((caddr_t)ro, sizeof(*ro));
435 if (opt && opt->ip6po_rthdr)
436 ro = &opt->ip6po_route;
437 dst = (struct sockaddr_in6 *)&ro->ro_dst;
439 if (ro->ro_rt == NULL)
440 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro);
444 * if specified, try to fill in the traffic class field.
445 * do not override if a non-zero value is already set.
446 * we check the diffserv field and the ecn field separately.
448 if (opt && opt->ip6po_tclass >= 0) {
451 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
453 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
456 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
459 /* fill in or override the hop limit field, if necessary. */
460 if (opt && opt->ip6po_hlim != -1)
461 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
462 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
464 ip6->ip6_hlim = im6o->im6o_multicast_hlim;
466 ip6->ip6_hlim = V_ip6_defmcasthlim;
470 ip6 = mtod(m, struct ip6_hdr *);
472 if (ro->ro_rt && fwd_tag == NULL) {
474 ifp = ro->ro_rt->rt_ifp;
476 if (fwd_tag == NULL) {
477 bzero(&dst_sa, sizeof(dst_sa));
478 dst_sa.sin6_family = AF_INET6;
479 dst_sa.sin6_len = sizeof(dst_sa);
480 dst_sa.sin6_addr = ip6->ip6_dst;
482 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp,
483 &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m));
486 in6_ifstat_inc(ifp, ifs6_out_discard);
492 * If in6_selectroute() does not return a route entry,
493 * dst may not have been updated.
495 *dst = dst_sa; /* XXX */
499 * then rt (for unicast) and ifp must be non-NULL valid values.
501 if ((flags & IPV6_FORWARDING) == 0) {
502 /* XXX: the FORWARDING flag can be set for mrouting. */
503 in6_ifstat_inc(ifp, ifs6_out_request);
506 ia = (struct in6_ifaddr *)(rt->rt_ifa);
507 counter_u64_add(rt->rt_pksent, 1);
512 * The outgoing interface must be in the zone of source and
513 * destination addresses.
518 if (in6_setscope(&src0, origifp, &zone))
520 bzero(&src_sa, sizeof(src_sa));
521 src_sa.sin6_family = AF_INET6;
522 src_sa.sin6_len = sizeof(src_sa);
523 src_sa.sin6_addr = ip6->ip6_src;
524 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
528 if (in6_setscope(&dst0, origifp, &zone))
530 /* re-initialize to be sure */
531 bzero(&dst_sa, sizeof(dst_sa));
532 dst_sa.sin6_family = AF_INET6;
533 dst_sa.sin6_len = sizeof(dst_sa);
534 dst_sa.sin6_addr = ip6->ip6_dst;
535 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) {
539 /* We should use ia_ifp to support the case of
540 * sending packets to an address of our own.
542 if (ia != NULL && ia->ia_ifp)
545 /* scope check is done. */
549 IP6STAT_INC(ip6s_badscope);
550 in6_ifstat_inc(origifp, ifs6_out_discard);
552 error = EHOSTUNREACH; /* XXX */
556 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
557 if (opt && opt->ip6po_nextroute.ro_rt) {
559 * The nexthop is explicitly specified by the
560 * application. We assume the next hop is an IPv6
563 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
565 else if ((rt->rt_flags & RTF_GATEWAY))
566 dst = (struct sockaddr_in6 *)rt->rt_gateway;
569 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
570 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
572 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
573 in6_ifstat_inc(ifp, ifs6_out_mcast);
575 * Confirm that the outgoing interface supports multicast.
577 if (!(ifp->if_flags & IFF_MULTICAST)) {
578 IP6STAT_INC(ip6s_noroute);
579 in6_ifstat_inc(ifp, ifs6_out_discard);
583 if ((im6o == NULL && in6_mcast_loop) ||
584 (im6o && im6o->im6o_multicast_loop)) {
586 * Loop back multicast datagram if not expressly
587 * forbidden to do so, even if we have not joined
588 * the address; protocols will filter it later,
589 * thus deferring a hash lookup and lock acquisition
590 * at the expense of an m_copym().
592 ip6_mloopback(ifp, m, dst);
595 * If we are acting as a multicast router, perform
596 * multicast forwarding as if the packet had just
597 * arrived on the interface to which we are about
598 * to send. The multicast forwarding function
599 * recursively calls this function, using the
600 * IPV6_FORWARDING flag to prevent infinite recursion.
602 * Multicasts that are looped back by ip6_mloopback(),
603 * above, will be forwarded by the ip6_input() routine,
606 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
608 * XXX: ip6_mforward expects that rcvif is NULL
609 * when it is called from the originating path.
610 * However, it may not always be the case.
612 m->m_pkthdr.rcvif = NULL;
613 if (ip6_mforward(ip6, ifp, m) != 0) {
620 * Multicasts with a hoplimit of zero may be looped back,
621 * above, but must not be transmitted on a network.
622 * Also, multicasts addressed to the loopback interface
623 * are not sent -- the above call to ip6_mloopback() will
624 * loop back a copy if this host actually belongs to the
625 * destination group on the loopback interface.
627 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
628 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
635 * Fill the outgoing inteface to tell the upper layer
636 * to increment per-interface statistics.
641 /* Determine path MTU. */
642 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu,
643 &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0)
647 * The caller of this function may specify to use the minimum MTU
649 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
650 * setting. The logic is a bit complicated; by default, unicast
651 * packets will follow path MTU while multicast packets will be sent at
652 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
653 * including unicast ones will be sent at the minimum MTU. Multicast
654 * packets will always be sent at the minimum MTU unless
655 * IP6PO_MINMTU_DISABLE is explicitly specified.
656 * See RFC 3542 for more details.
658 if (mtu > IPV6_MMTU) {
659 if ((flags & IPV6_MINMTU))
661 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
663 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
665 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
671 * clear embedded scope identifiers if necessary.
672 * in6_clearscope will touch the addresses only when necessary.
674 in6_clearscope(&ip6->ip6_src);
675 in6_clearscope(&ip6->ip6_dst);
678 * If the outgoing packet contains a hop-by-hop options header,
679 * it must be examined and processed even by the source node.
680 * (RFC 2460, section 4.)
682 if (exthdrs.ip6e_hbh) {
683 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
684 u_int32_t dummy; /* XXX unused */
685 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
688 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
689 panic("ip6e_hbh is not contiguous");
692 * XXX: if we have to send an ICMPv6 error to the sender,
693 * we need the M_LOOP flag since icmp6_error() expects
694 * the IPv6 and the hop-by-hop options header are
695 * contiguous unless the flag is set.
697 m->m_flags |= M_LOOP;
698 m->m_pkthdr.rcvif = ifp;
699 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
700 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
701 &dummy, &plen) < 0) {
702 /* m was already freed at this point */
703 error = EINVAL;/* better error? */
706 m->m_flags &= ~M_LOOP; /* XXX */
707 m->m_pkthdr.rcvif = NULL;
710 /* Jump over all PFIL processing if hooks are not active. */
711 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
715 /* Run through list of hooks for output packets. */
716 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp);
717 if (error != 0 || m == NULL)
719 ip6 = mtod(m, struct ip6_hdr *);
721 /* See if destination IP address was changed by packet filter. */
722 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
723 m->m_flags |= M_SKIP_FIREWALL;
724 /* If destination is now ourself drop to ip6_input(). */
725 if (in6_localip(&ip6->ip6_dst)) {
726 m->m_flags |= M_FASTFWD_OURS;
727 if (m->m_pkthdr.rcvif == NULL)
728 m->m_pkthdr.rcvif = V_loif;
729 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
730 m->m_pkthdr.csum_flags |=
731 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
732 m->m_pkthdr.csum_data = 0xffff;
735 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
736 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
738 error = netisr_queue(NETISR_IPV6, m);
741 goto again; /* Redo the routing table lookup. */
744 /* See if local, if yes, send it to netisr. */
745 if (m->m_flags & M_FASTFWD_OURS) {
746 if (m->m_pkthdr.rcvif == NULL)
747 m->m_pkthdr.rcvif = V_loif;
748 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
749 m->m_pkthdr.csum_flags |=
750 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
751 m->m_pkthdr.csum_data = 0xffff;
754 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
755 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
757 error = netisr_queue(NETISR_IPV6, m);
760 /* Or forward to some other address? */
761 if ((m->m_flags & M_IP6_NEXTHOP) &&
762 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
763 dst = (struct sockaddr_in6 *)&ro->ro_dst;
764 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
765 m->m_flags |= M_SKIP_FIREWALL;
766 m->m_flags &= ~M_IP6_NEXTHOP;
767 m_tag_delete(m, fwd_tag);
773 * Send the packet to the outgoing interface.
774 * If necessary, do IPv6 fragmentation before sending.
776 * the logic here is rather complex:
777 * 1: normal case (dontfrag == 0, alwaysfrag == 0)
778 * 1-a: send as is if tlen <= path mtu
779 * 1-b: fragment if tlen > path mtu
781 * 2: if user asks us not to fragment (dontfrag == 1)
782 * 2-a: send as is if tlen <= interface mtu
783 * 2-b: error if tlen > interface mtu
785 * 3: if we always need to attach fragment header (alwaysfrag == 1)
788 * 4: if dontfrag == 1 && alwaysfrag == 1
789 * error, as we cannot handle this conflicting request
791 sw_csum = m->m_pkthdr.csum_flags;
793 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0;
794 sw_csum &= ~ifp->if_hwassist;
798 * If we added extension headers, we will not do TSO and calculate the
799 * checksums ourselves for now.
800 * XXX-BZ Need a framework to know when the NIC can handle it, even
803 if (sw_csum & CSUM_DELAY_DATA_IPV6) {
804 sw_csum &= ~CSUM_DELAY_DATA_IPV6;
805 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
808 if (sw_csum & CSUM_SCTP_IPV6) {
809 sw_csum &= ~CSUM_SCTP_IPV6;
810 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
813 m->m_pkthdr.csum_flags &= ifp->if_hwassist;
814 tlen = m->m_pkthdr.len;
816 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
820 if (dontfrag && alwaysfrag) { /* case 4 */
821 /* conflicting request - can't transmit */
825 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */
827 * Even if the DONTFRAG option is specified, we cannot send the
828 * packet when the data length is larger than the MTU of the
829 * outgoing interface.
830 * Notify the error by sending IPV6_PATHMTU ancillary data as
831 * well as returning an error code (the latter is not described
835 struct ip6ctlparam ip6cp;
837 mtu32 = (u_int32_t)mtu;
838 bzero(&ip6cp, sizeof(ip6cp));
839 ip6cp.ip6c_cmdarg = (void *)&mtu32;
840 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
848 * transmit packet without fragmentation
850 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
851 struct in6_ifaddr *ia6;
853 ip6 = mtod(m, struct ip6_hdr *);
854 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
856 /* Record statistics for this interface address. */
857 counter_u64_add(ia6->ia_ifa.ifa_opackets, 1);
858 counter_u64_add(ia6->ia_ifa.ifa_obytes,
860 ifa_free(&ia6->ia_ifa);
862 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
867 * try to fragment the packet. case 1-b and 3
869 if (mtu < IPV6_MMTU) {
870 /* path MTU cannot be less than IPV6_MMTU */
872 in6_ifstat_inc(ifp, ifs6_out_fragfail);
874 } else if (ip6->ip6_plen == 0) {
875 /* jumbo payload cannot be fragmented */
877 in6_ifstat_inc(ifp, ifs6_out_fragfail);
880 struct mbuf **mnext, *m_frgpart;
881 struct ip6_frag *ip6f;
882 u_int32_t id = htonl(ip6_randomid());
885 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len;
888 * Too large for the destination or interface;
889 * fragment if possible.
890 * Must be able to put at least 8 bytes per fragment.
892 hlen = unfragpartlen;
893 if (mtu > IPV6_MAXPACKET)
894 mtu = IPV6_MAXPACKET;
896 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
899 in6_ifstat_inc(ifp, ifs6_out_fragfail);
904 * Verify that we have any chance at all of being able to queue
905 * the packet or packet fragments
907 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen)
908 < tlen /* - hlen */)) {
910 IP6STAT_INC(ip6s_odropped);
916 * If the interface will not calculate checksums on
917 * fragmented packets, then do it here.
918 * XXX-BZ handle the hw offloading case. Need flags.
920 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
921 in6_delayed_cksum(m, plen, hlen);
922 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
925 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
926 sctp_delayed_cksum(m, hlen);
927 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
930 mnext = &m->m_nextpkt;
933 * Change the next header field of the last header in the
934 * unfragmentable part.
936 if (exthdrs.ip6e_rthdr) {
937 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
938 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
939 } else if (exthdrs.ip6e_dest1) {
940 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
941 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
942 } else if (exthdrs.ip6e_hbh) {
943 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
944 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
946 nextproto = ip6->ip6_nxt;
947 ip6->ip6_nxt = IPPROTO_FRAGMENT;
951 * Loop through length of segment after first fragment,
952 * make new header and copy data of each part and link onto
956 for (off = hlen; off < tlen; off += len) {
957 m = m_gethdr(M_NOWAIT, MT_DATA);
960 IP6STAT_INC(ip6s_odropped);
963 m->m_flags = m0->m_flags & M_COPYFLAGS;
965 mnext = &m->m_nextpkt;
966 m->m_data += max_linkhdr;
967 mhip6 = mtod(m, struct ip6_hdr *);
969 m->m_len = sizeof(*mhip6);
970 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
972 IP6STAT_INC(ip6s_odropped);
975 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
976 if (off + len >= tlen)
979 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
980 mhip6->ip6_plen = htons((u_short)(len + hlen +
981 sizeof(*ip6f) - sizeof(struct ip6_hdr)));
982 if ((m_frgpart = m_copy(m0, off, len)) == 0) {
984 IP6STAT_INC(ip6s_odropped);
988 m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
989 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum;
990 m->m_pkthdr.rcvif = NULL;
991 ip6f->ip6f_reserved = 0;
992 ip6f->ip6f_ident = id;
993 ip6f->ip6f_nxt = nextproto;
994 IP6STAT_INC(ip6s_ofragments);
995 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
998 in6_ifstat_inc(ifp, ifs6_out_fragok);
1002 * Remove leading garbages.
1008 for (m0 = m; m; m = m0) {
1012 /* Record statistics for this interface address. */
1014 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
1015 counter_u64_add(ia->ia_ifa.ifa_obytes,
1018 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
1024 IP6STAT_INC(ip6s_fragmented);
1027 if (ro == &ip6route)
1029 if (ro_pmtu == &ip6route)
1034 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */
1035 m_freem(exthdrs.ip6e_dest1);
1036 m_freem(exthdrs.ip6e_rthdr);
1037 m_freem(exthdrs.ip6e_dest2);
1046 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1050 if (hlen > MCLBYTES)
1051 return (ENOBUFS); /* XXX */
1054 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1056 m = m_get(M_NOWAIT, MT_DATA);
1061 bcopy(hdr, mtod(m, caddr_t), hlen);
1068 * Insert jumbo payload option.
1071 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1077 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */
1080 * If there is no hop-by-hop options header, allocate new one.
1081 * If there is one but it doesn't have enough space to store the
1082 * jumbo payload option, allocate a cluster to store the whole options.
1083 * Otherwise, use it to store the options.
1085 if (exthdrs->ip6e_hbh == 0) {
1086 mopt = m_get(M_NOWAIT, MT_DATA);
1089 mopt->m_len = JUMBOOPTLEN;
1090 optbuf = mtod(mopt, u_char *);
1091 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */
1092 exthdrs->ip6e_hbh = mopt;
1094 struct ip6_hbh *hbh;
1096 mopt = exthdrs->ip6e_hbh;
1097 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1100 * - exthdrs->ip6e_hbh is not referenced from places
1101 * other than exthdrs.
1102 * - exthdrs->ip6e_hbh is not an mbuf chain.
1104 int oldoptlen = mopt->m_len;
1108 * XXX: give up if the whole (new) hbh header does
1109 * not fit even in an mbuf cluster.
1111 if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1115 * As a consequence, we must always prepare a cluster
1118 n = m_getcl(M_NOWAIT, MT_DATA, 0);
1121 n->m_len = oldoptlen + JUMBOOPTLEN;
1122 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
1124 optbuf = mtod(n, caddr_t) + oldoptlen;
1126 mopt = exthdrs->ip6e_hbh = n;
1128 optbuf = mtod(mopt, u_char *) + mopt->m_len;
1129 mopt->m_len += JUMBOOPTLEN;
1131 optbuf[0] = IP6OPT_PADN;
1135 * Adjust the header length according to the pad and
1136 * the jumbo payload option.
1138 hbh = mtod(mopt, struct ip6_hbh *);
1139 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1142 /* fill in the option. */
1143 optbuf[2] = IP6OPT_JUMBO;
1145 v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1146 bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1148 /* finally, adjust the packet header length */
1149 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1156 * Insert fragment header and copy unfragmentable header portions.
1159 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1160 struct ip6_frag **frghdrp)
1162 struct mbuf *n, *mlast;
1164 if (hlen > sizeof(struct ip6_hdr)) {
1165 n = m_copym(m0, sizeof(struct ip6_hdr),
1166 hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1173 /* Search for the last mbuf of unfragmentable part. */
1174 for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1177 if ((mlast->m_flags & M_EXT) == 0 &&
1178 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1179 /* use the trailing space of the last mbuf for the fragment hdr */
1180 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1182 mlast->m_len += sizeof(struct ip6_frag);
1183 m->m_pkthdr.len += sizeof(struct ip6_frag);
1185 /* allocate a new mbuf for the fragment header */
1188 mfrg = m_get(M_NOWAIT, MT_DATA);
1191 mfrg->m_len = sizeof(struct ip6_frag);
1192 *frghdrp = mtod(mfrg, struct ip6_frag *);
1193 mlast->m_next = mfrg;
1200 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro,
1201 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup,
1202 int *alwaysfragp, u_int fibnum)
1208 if (ro_pmtu != ro) {
1209 /* The first hop and the final destination may differ. */
1210 struct sockaddr_in6 *sa6_dst =
1211 (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1212 if (ro_pmtu->ro_rt &&
1213 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 ||
1214 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) {
1215 RTFREE(ro_pmtu->ro_rt);
1216 ro_pmtu->ro_rt = (struct rtentry *)NULL;
1218 if (ro_pmtu->ro_rt == NULL) {
1219 bzero(sa6_dst, sizeof(*sa6_dst));
1220 sa6_dst->sin6_family = AF_INET6;
1221 sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1222 sa6_dst->sin6_addr = *dst;
1224 in6_rtalloc(ro_pmtu, fibnum);
1227 if (ro_pmtu->ro_rt) {
1229 struct in_conninfo inc;
1231 bzero(&inc, sizeof(inc));
1232 inc.inc_flags |= INC_ISIPV6;
1233 inc.inc6_faddr = *dst;
1236 ifp = ro_pmtu->ro_rt->rt_ifp;
1237 ifmtu = IN6_LINKMTU(ifp);
1238 mtu = tcp_hc_getmtu(&inc);
1240 mtu = min(mtu, ro_pmtu->ro_rt->rt_mtu);
1242 mtu = ro_pmtu->ro_rt->rt_mtu;
1245 else if (mtu < IPV6_MMTU) {
1247 * RFC2460 section 5, last paragraph:
1248 * if we record ICMPv6 too big message with
1249 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1250 * or smaller, with framgent header attached.
1251 * (fragment header is needed regardless from the
1252 * packet size, for translators to identify packets)
1256 } else if (mtu > ifmtu) {
1258 * The MTU on the route is larger than the MTU on
1259 * the interface! This shouldn't happen, unless the
1260 * MTU of the interface has been changed after the
1261 * interface was brought up. Change the MTU in the
1262 * route to match the interface MTU (as long as the
1263 * field isn't locked).
1266 ro_pmtu->ro_rt->rt_mtu = mtu;
1269 mtu = IN6_LINKMTU(ifp);
1271 error = EHOSTUNREACH; /* XXX */
1275 *alwaysfragp = alwaysfrag;
1280 * IP6 socket option processing.
1283 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1285 int optdatalen, uproto;
1287 struct inpcb *in6p = sotoinpcb(so);
1289 int level, op, optname;
1293 uint32_t rss_bucket;
1297 level = sopt->sopt_level;
1298 op = sopt->sopt_dir;
1299 optname = sopt->sopt_name;
1300 optlen = sopt->sopt_valsize;
1304 uproto = (int)so->so_proto->pr_protocol;
1306 if (level != IPPROTO_IPV6) {
1309 if (sopt->sopt_level == SOL_SOCKET &&
1310 sopt->sopt_dir == SOPT_SET) {
1311 switch (sopt->sopt_name) {
1314 if ((so->so_options & SO_REUSEADDR) != 0)
1315 in6p->inp_flags2 |= INP_REUSEADDR;
1317 in6p->inp_flags2 &= ~INP_REUSEADDR;
1323 if ((so->so_options & SO_REUSEPORT) != 0)
1324 in6p->inp_flags2 |= INP_REUSEPORT;
1326 in6p->inp_flags2 &= ~INP_REUSEPORT;
1332 in6p->inp_inc.inc_fibnum = so->so_fibnum;
1340 } else { /* level == IPPROTO_IPV6 */
1345 case IPV6_2292PKTOPTIONS:
1346 #ifdef IPV6_PKTOPTIONS
1347 case IPV6_PKTOPTIONS:
1352 error = soopt_getm(sopt, &m); /* XXX */
1355 error = soopt_mcopyin(sopt, m); /* XXX */
1358 error = ip6_pcbopts(&in6p->in6p_outputopts,
1360 m_freem(m); /* XXX */
1365 * Use of some Hop-by-Hop options or some
1366 * Destination options, might require special
1367 * privilege. That is, normal applications
1368 * (without special privilege) might be forbidden
1369 * from setting certain options in outgoing packets,
1370 * and might never see certain options in received
1371 * packets. [RFC 2292 Section 6]
1372 * KAME specific note:
1373 * KAME prevents non-privileged users from sending or
1374 * receiving ANY hbh/dst options in order to avoid
1375 * overhead of parsing options in the kernel.
1377 case IPV6_RECVHOPOPTS:
1378 case IPV6_RECVDSTOPTS:
1379 case IPV6_RECVRTHDRDSTOPTS:
1381 error = priv_check(td,
1382 PRIV_NETINET_SETHDROPTS);
1387 case IPV6_UNICAST_HOPS:
1391 case IPV6_RECVPKTINFO:
1392 case IPV6_RECVHOPLIMIT:
1393 case IPV6_RECVRTHDR:
1394 case IPV6_RECVPATHMTU:
1395 case IPV6_RECVTCLASS:
1397 case IPV6_AUTOFLOWLABEL:
1399 case IPV6_BINDMULTI:
1401 case IPV6_RSS_LISTEN_BUCKET:
1403 if (optname == IPV6_BINDANY && td != NULL) {
1404 error = priv_check(td,
1405 PRIV_NETINET_BINDANY);
1410 if (optlen != sizeof(int)) {
1414 error = sooptcopyin(sopt, &optval,
1415 sizeof optval, sizeof optval);
1420 case IPV6_UNICAST_HOPS:
1421 if (optval < -1 || optval >= 256)
1424 /* -1 = kernel default */
1425 in6p->in6p_hops = optval;
1426 if ((in6p->inp_vflag &
1428 in6p->inp_ip_ttl = optval;
1431 #define OPTSET(bit) \
1435 in6p->inp_flags |= (bit); \
1437 in6p->inp_flags &= ~(bit); \
1438 INP_WUNLOCK(in6p); \
1439 } while (/*CONSTCOND*/ 0)
1440 #define OPTSET2292(bit) \
1443 in6p->inp_flags |= IN6P_RFC2292; \
1445 in6p->inp_flags |= (bit); \
1447 in6p->inp_flags &= ~(bit); \
1448 INP_WUNLOCK(in6p); \
1449 } while (/*CONSTCOND*/ 0)
1450 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0)
1452 #define OPTSET2(bit, val) do { \
1455 in6p->inp_flags2 |= bit; \
1457 in6p->inp_flags2 &= ~bit; \
1458 INP_WUNLOCK(in6p); \
1460 #define OPTBIT2(bit) (in6p->inp_flags2 & (bit) ? 1 : 0)
1462 case IPV6_RECVPKTINFO:
1463 /* cannot mix with RFC2292 */
1464 if (OPTBIT(IN6P_RFC2292)) {
1468 OPTSET(IN6P_PKTINFO);
1473 struct ip6_pktopts **optp;
1475 /* cannot mix with RFC2292 */
1476 if (OPTBIT(IN6P_RFC2292)) {
1480 optp = &in6p->in6p_outputopts;
1481 error = ip6_pcbopt(IPV6_HOPLIMIT,
1482 (u_char *)&optval, sizeof(optval),
1483 optp, (td != NULL) ? td->td_ucred :
1488 case IPV6_RECVHOPLIMIT:
1489 /* cannot mix with RFC2292 */
1490 if (OPTBIT(IN6P_RFC2292)) {
1494 OPTSET(IN6P_HOPLIMIT);
1497 case IPV6_RECVHOPOPTS:
1498 /* cannot mix with RFC2292 */
1499 if (OPTBIT(IN6P_RFC2292)) {
1503 OPTSET(IN6P_HOPOPTS);
1506 case IPV6_RECVDSTOPTS:
1507 /* cannot mix with RFC2292 */
1508 if (OPTBIT(IN6P_RFC2292)) {
1512 OPTSET(IN6P_DSTOPTS);
1515 case IPV6_RECVRTHDRDSTOPTS:
1516 /* cannot mix with RFC2292 */
1517 if (OPTBIT(IN6P_RFC2292)) {
1521 OPTSET(IN6P_RTHDRDSTOPTS);
1524 case IPV6_RECVRTHDR:
1525 /* cannot mix with RFC2292 */
1526 if (OPTBIT(IN6P_RFC2292)) {
1537 case IPV6_RECVPATHMTU:
1539 * We ignore this option for TCP
1541 * (RFC3542 leaves this case
1544 if (uproto != IPPROTO_TCP)
1550 * make setsockopt(IPV6_V6ONLY)
1551 * available only prior to bind(2).
1552 * see ipng mailing list, Jun 22 2001.
1554 if (in6p->inp_lport ||
1555 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1559 OPTSET(IN6P_IPV6_V6ONLY);
1561 in6p->inp_vflag &= ~INP_IPV4;
1563 in6p->inp_vflag |= INP_IPV4;
1565 case IPV6_RECVTCLASS:
1566 /* cannot mix with RFC2292 XXX */
1567 if (OPTBIT(IN6P_RFC2292)) {
1571 OPTSET(IN6P_TCLASS);
1573 case IPV6_AUTOFLOWLABEL:
1574 OPTSET(IN6P_AUTOFLOWLABEL);
1578 OPTSET(INP_BINDANY);
1581 case IPV6_BINDMULTI:
1582 OPTSET2(INP_BINDMULTI, optval);
1585 case IPV6_RSS_LISTEN_BUCKET:
1586 if ((optval >= 0) &&
1587 (optval < rss_getnumbuckets())) {
1588 in6p->inp_rss_listen_bucket = optval;
1589 OPTSET2(INP_RSS_BUCKET_SET, 1);
1600 case IPV6_USE_MIN_MTU:
1601 case IPV6_PREFER_TEMPADDR:
1602 if (optlen != sizeof(optval)) {
1606 error = sooptcopyin(sopt, &optval,
1607 sizeof optval, sizeof optval);
1611 struct ip6_pktopts **optp;
1612 optp = &in6p->in6p_outputopts;
1613 error = ip6_pcbopt(optname,
1614 (u_char *)&optval, sizeof(optval),
1615 optp, (td != NULL) ? td->td_ucred :
1620 case IPV6_2292PKTINFO:
1621 case IPV6_2292HOPLIMIT:
1622 case IPV6_2292HOPOPTS:
1623 case IPV6_2292DSTOPTS:
1624 case IPV6_2292RTHDR:
1626 if (optlen != sizeof(int)) {
1630 error = sooptcopyin(sopt, &optval,
1631 sizeof optval, sizeof optval);
1635 case IPV6_2292PKTINFO:
1636 OPTSET2292(IN6P_PKTINFO);
1638 case IPV6_2292HOPLIMIT:
1639 OPTSET2292(IN6P_HOPLIMIT);
1641 case IPV6_2292HOPOPTS:
1643 * Check super-user privilege.
1644 * See comments for IPV6_RECVHOPOPTS.
1647 error = priv_check(td,
1648 PRIV_NETINET_SETHDROPTS);
1652 OPTSET2292(IN6P_HOPOPTS);
1654 case IPV6_2292DSTOPTS:
1656 error = priv_check(td,
1657 PRIV_NETINET_SETHDROPTS);
1661 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1663 case IPV6_2292RTHDR:
1664 OPTSET2292(IN6P_RTHDR);
1672 case IPV6_RTHDRDSTOPTS:
1675 /* new advanced API (RFC3542) */
1677 u_char optbuf_storage[MCLBYTES];
1679 struct ip6_pktopts **optp;
1681 /* cannot mix with RFC2292 */
1682 if (OPTBIT(IN6P_RFC2292)) {
1688 * We only ensure valsize is not too large
1689 * here. Further validation will be done
1692 error = sooptcopyin(sopt, optbuf_storage,
1693 sizeof(optbuf_storage), 0);
1696 optlen = sopt->sopt_valsize;
1697 optbuf = optbuf_storage;
1698 optp = &in6p->in6p_outputopts;
1699 error = ip6_pcbopt(optname, optbuf, optlen,
1700 optp, (td != NULL) ? td->td_ucred : NULL,
1706 case IPV6_MULTICAST_IF:
1707 case IPV6_MULTICAST_HOPS:
1708 case IPV6_MULTICAST_LOOP:
1709 case IPV6_JOIN_GROUP:
1710 case IPV6_LEAVE_GROUP:
1712 case MCAST_BLOCK_SOURCE:
1713 case MCAST_UNBLOCK_SOURCE:
1714 case MCAST_JOIN_GROUP:
1715 case MCAST_LEAVE_GROUP:
1716 case MCAST_JOIN_SOURCE_GROUP:
1717 case MCAST_LEAVE_SOURCE_GROUP:
1718 error = ip6_setmoptions(in6p, sopt);
1721 case IPV6_PORTRANGE:
1722 error = sooptcopyin(sopt, &optval,
1723 sizeof optval, sizeof optval);
1729 case IPV6_PORTRANGE_DEFAULT:
1730 in6p->inp_flags &= ~(INP_LOWPORT);
1731 in6p->inp_flags &= ~(INP_HIGHPORT);
1734 case IPV6_PORTRANGE_HIGH:
1735 in6p->inp_flags &= ~(INP_LOWPORT);
1736 in6p->inp_flags |= INP_HIGHPORT;
1739 case IPV6_PORTRANGE_LOW:
1740 in6p->inp_flags &= ~(INP_HIGHPORT);
1741 in6p->inp_flags |= INP_LOWPORT;
1752 case IPV6_IPSEC_POLICY:
1757 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1759 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
1761 req = mtod(m, caddr_t);
1762 error = ipsec_set_policy(in6p, optname, req,
1763 m->m_len, (sopt->sopt_td != NULL) ?
1764 sopt->sopt_td->td_ucred : NULL);
1771 error = ENOPROTOOPT;
1779 case IPV6_2292PKTOPTIONS:
1780 #ifdef IPV6_PKTOPTIONS
1781 case IPV6_PKTOPTIONS:
1784 * RFC3542 (effectively) deprecated the
1785 * semantics of the 2292-style pktoptions.
1786 * Since it was not reliable in nature (i.e.,
1787 * applications had to expect the lack of some
1788 * information after all), it would make sense
1789 * to simplify this part by always returning
1792 sopt->sopt_valsize = 0;
1795 case IPV6_RECVHOPOPTS:
1796 case IPV6_RECVDSTOPTS:
1797 case IPV6_RECVRTHDRDSTOPTS:
1798 case IPV6_UNICAST_HOPS:
1799 case IPV6_RECVPKTINFO:
1800 case IPV6_RECVHOPLIMIT:
1801 case IPV6_RECVRTHDR:
1802 case IPV6_RECVPATHMTU:
1806 case IPV6_PORTRANGE:
1807 case IPV6_RECVTCLASS:
1808 case IPV6_AUTOFLOWLABEL:
1813 case IPV6_RSSBUCKETID:
1817 case IPV6_RECVHOPOPTS:
1818 optval = OPTBIT(IN6P_HOPOPTS);
1821 case IPV6_RECVDSTOPTS:
1822 optval = OPTBIT(IN6P_DSTOPTS);
1825 case IPV6_RECVRTHDRDSTOPTS:
1826 optval = OPTBIT(IN6P_RTHDRDSTOPTS);
1829 case IPV6_UNICAST_HOPS:
1830 optval = in6p->in6p_hops;
1833 case IPV6_RECVPKTINFO:
1834 optval = OPTBIT(IN6P_PKTINFO);
1837 case IPV6_RECVHOPLIMIT:
1838 optval = OPTBIT(IN6P_HOPLIMIT);
1841 case IPV6_RECVRTHDR:
1842 optval = OPTBIT(IN6P_RTHDR);
1845 case IPV6_RECVPATHMTU:
1846 optval = OPTBIT(IN6P_MTU);
1850 optval = OPTBIT(INP_FAITH);
1854 optval = OPTBIT(IN6P_IPV6_V6ONLY);
1857 case IPV6_PORTRANGE:
1860 flags = in6p->inp_flags;
1861 if (flags & INP_HIGHPORT)
1862 optval = IPV6_PORTRANGE_HIGH;
1863 else if (flags & INP_LOWPORT)
1864 optval = IPV6_PORTRANGE_LOW;
1869 case IPV6_RECVTCLASS:
1870 optval = OPTBIT(IN6P_TCLASS);
1873 case IPV6_AUTOFLOWLABEL:
1874 optval = OPTBIT(IN6P_AUTOFLOWLABEL);
1878 optval = OPTBIT(INP_BINDANY);
1882 optval = in6p->inp_flowid;
1886 optval = in6p->inp_flowtype;
1889 case IPV6_RSSBUCKETID:
1891 rss_hash2bucket(in6p->inp_flowid,
1895 optval = rss_bucket;
1901 case IPV6_BINDMULTI:
1902 optval = OPTBIT2(INP_BINDMULTI);
1908 error = sooptcopyout(sopt, &optval,
1915 struct ip6_mtuinfo mtuinfo;
1916 struct route_in6 sro;
1918 bzero(&sro, sizeof(sro));
1920 if (!(so->so_state & SS_ISCONNECTED))
1923 * XXX: we dot not consider the case of source
1924 * routing, or optional information to specify
1925 * the outgoing interface.
1927 error = ip6_getpmtu(&sro, NULL, NULL,
1928 &in6p->in6p_faddr, &pmtu, NULL,
1934 if (pmtu > IPV6_MAXPACKET)
1935 pmtu = IPV6_MAXPACKET;
1937 bzero(&mtuinfo, sizeof(mtuinfo));
1938 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
1939 optdata = (void *)&mtuinfo;
1940 optdatalen = sizeof(mtuinfo);
1941 error = sooptcopyout(sopt, optdata,
1946 case IPV6_2292PKTINFO:
1947 case IPV6_2292HOPLIMIT:
1948 case IPV6_2292HOPOPTS:
1949 case IPV6_2292RTHDR:
1950 case IPV6_2292DSTOPTS:
1952 case IPV6_2292PKTINFO:
1953 optval = OPTBIT(IN6P_PKTINFO);
1955 case IPV6_2292HOPLIMIT:
1956 optval = OPTBIT(IN6P_HOPLIMIT);
1958 case IPV6_2292HOPOPTS:
1959 optval = OPTBIT(IN6P_HOPOPTS);
1961 case IPV6_2292RTHDR:
1962 optval = OPTBIT(IN6P_RTHDR);
1964 case IPV6_2292DSTOPTS:
1965 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
1968 error = sooptcopyout(sopt, &optval,
1975 case IPV6_RTHDRDSTOPTS:
1979 case IPV6_USE_MIN_MTU:
1980 case IPV6_PREFER_TEMPADDR:
1981 error = ip6_getpcbopt(in6p->in6p_outputopts,
1985 case IPV6_MULTICAST_IF:
1986 case IPV6_MULTICAST_HOPS:
1987 case IPV6_MULTICAST_LOOP:
1989 error = ip6_getmoptions(in6p, sopt);
1993 case IPV6_IPSEC_POLICY:
1997 struct mbuf *m = NULL;
1998 struct mbuf **mp = &m;
1999 size_t ovalsize = sopt->sopt_valsize;
2000 caddr_t oval = (caddr_t)sopt->sopt_val;
2002 error = soopt_getm(sopt, &m); /* XXX */
2005 error = soopt_mcopyin(sopt, m); /* XXX */
2008 sopt->sopt_valsize = ovalsize;
2009 sopt->sopt_val = oval;
2011 req = mtod(m, caddr_t);
2014 error = ipsec_get_policy(in6p, req, len, mp);
2016 error = soopt_mcopyout(sopt, m); /* XXX */
2017 if (error == 0 && m)
2024 error = ENOPROTOOPT;
2034 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2036 int error = 0, optval, optlen;
2037 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2038 struct inpcb *in6p = sotoinpcb(so);
2039 int level, op, optname;
2041 level = sopt->sopt_level;
2042 op = sopt->sopt_dir;
2043 optname = sopt->sopt_name;
2044 optlen = sopt->sopt_valsize;
2046 if (level != IPPROTO_IPV6) {
2053 * For ICMPv6 sockets, no modification allowed for checksum
2054 * offset, permit "no change" values to help existing apps.
2056 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2057 * for an ICMPv6 socket will fail."
2058 * The current behavior does not meet RFC3542.
2062 if (optlen != sizeof(int)) {
2066 error = sooptcopyin(sopt, &optval, sizeof(optval),
2070 if ((optval % 2) != 0) {
2071 /* the API assumes even offset values */
2073 } else if (so->so_proto->pr_protocol ==
2075 if (optval != icmp6off)
2078 in6p->in6p_cksum = optval;
2082 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
2085 optval = in6p->in6p_cksum;
2087 error = sooptcopyout(sopt, &optval, sizeof(optval));
2097 error = ENOPROTOOPT;
2105 * Set up IP6 options in pcb for insertion in output packets or
2106 * specifying behavior of outgoing packets.
2109 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2110 struct socket *so, struct sockopt *sopt)
2112 struct ip6_pktopts *opt = *pktopt;
2114 struct thread *td = sopt->sopt_td;
2116 /* turn off any old options. */
2119 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2120 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2121 opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2122 printf("ip6_pcbopts: all specified options are cleared.\n");
2124 ip6_clearpktopts(opt, -1);
2126 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2129 if (!m || m->m_len == 0) {
2131 * Only turning off any previous options, regardless of
2132 * whether the opt is just created or given.
2134 free(opt, M_IP6OPT);
2138 /* set options specified by user. */
2139 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2140 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2141 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2142 free(opt, M_IP6OPT);
2150 * initialize ip6_pktopts. beware that there are non-zero default values in
2154 ip6_initpktopts(struct ip6_pktopts *opt)
2157 bzero(opt, sizeof(*opt));
2158 opt->ip6po_hlim = -1; /* -1 means default hop limit */
2159 opt->ip6po_tclass = -1; /* -1 means default traffic class */
2160 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2161 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2165 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2166 struct ucred *cred, int uproto)
2168 struct ip6_pktopts *opt;
2170 if (*pktopt == NULL) {
2171 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2173 ip6_initpktopts(*pktopt);
2177 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
2181 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt)
2183 void *optdata = NULL;
2185 struct ip6_ext *ip6e;
2187 struct in6_pktinfo null_pktinfo;
2188 int deftclass = 0, on;
2189 int defminmtu = IP6PO_MINMTU_MCASTONLY;
2190 int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2194 if (pktopt && pktopt->ip6po_pktinfo)
2195 optdata = (void *)pktopt->ip6po_pktinfo;
2197 /* XXX: we don't have to do this every time... */
2198 bzero(&null_pktinfo, sizeof(null_pktinfo));
2199 optdata = (void *)&null_pktinfo;
2201 optdatalen = sizeof(struct in6_pktinfo);
2204 if (pktopt && pktopt->ip6po_tclass >= 0)
2205 optdata = (void *)&pktopt->ip6po_tclass;
2207 optdata = (void *)&deftclass;
2208 optdatalen = sizeof(int);
2211 if (pktopt && pktopt->ip6po_hbh) {
2212 optdata = (void *)pktopt->ip6po_hbh;
2213 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
2214 optdatalen = (ip6e->ip6e_len + 1) << 3;
2218 if (pktopt && pktopt->ip6po_rthdr) {
2219 optdata = (void *)pktopt->ip6po_rthdr;
2220 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
2221 optdatalen = (ip6e->ip6e_len + 1) << 3;
2224 case IPV6_RTHDRDSTOPTS:
2225 if (pktopt && pktopt->ip6po_dest1) {
2226 optdata = (void *)pktopt->ip6po_dest1;
2227 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
2228 optdatalen = (ip6e->ip6e_len + 1) << 3;
2232 if (pktopt && pktopt->ip6po_dest2) {
2233 optdata = (void *)pktopt->ip6po_dest2;
2234 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
2235 optdatalen = (ip6e->ip6e_len + 1) << 3;
2239 if (pktopt && pktopt->ip6po_nexthop) {
2240 optdata = (void *)pktopt->ip6po_nexthop;
2241 optdatalen = pktopt->ip6po_nexthop->sa_len;
2244 case IPV6_USE_MIN_MTU:
2246 optdata = (void *)&pktopt->ip6po_minmtu;
2248 optdata = (void *)&defminmtu;
2249 optdatalen = sizeof(int);
2252 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2256 optdata = (void *)&on;
2257 optdatalen = sizeof(on);
2259 case IPV6_PREFER_TEMPADDR:
2261 optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
2263 optdata = (void *)&defpreftemp;
2264 optdatalen = sizeof(int);
2266 default: /* should not happen */
2268 panic("ip6_getpcbopt: unexpected option\n");
2270 return (ENOPROTOOPT);
2273 error = sooptcopyout(sopt, optdata, optdatalen);
2279 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2284 if (optname == -1 || optname == IPV6_PKTINFO) {
2285 if (pktopt->ip6po_pktinfo)
2286 free(pktopt->ip6po_pktinfo, M_IP6OPT);
2287 pktopt->ip6po_pktinfo = NULL;
2289 if (optname == -1 || optname == IPV6_HOPLIMIT)
2290 pktopt->ip6po_hlim = -1;
2291 if (optname == -1 || optname == IPV6_TCLASS)
2292 pktopt->ip6po_tclass = -1;
2293 if (optname == -1 || optname == IPV6_NEXTHOP) {
2294 if (pktopt->ip6po_nextroute.ro_rt) {
2295 RTFREE(pktopt->ip6po_nextroute.ro_rt);
2296 pktopt->ip6po_nextroute.ro_rt = NULL;
2298 if (pktopt->ip6po_nexthop)
2299 free(pktopt->ip6po_nexthop, M_IP6OPT);
2300 pktopt->ip6po_nexthop = NULL;
2302 if (optname == -1 || optname == IPV6_HOPOPTS) {
2303 if (pktopt->ip6po_hbh)
2304 free(pktopt->ip6po_hbh, M_IP6OPT);
2305 pktopt->ip6po_hbh = NULL;
2307 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2308 if (pktopt->ip6po_dest1)
2309 free(pktopt->ip6po_dest1, M_IP6OPT);
2310 pktopt->ip6po_dest1 = NULL;
2312 if (optname == -1 || optname == IPV6_RTHDR) {
2313 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2314 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2315 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2316 if (pktopt->ip6po_route.ro_rt) {
2317 RTFREE(pktopt->ip6po_route.ro_rt);
2318 pktopt->ip6po_route.ro_rt = NULL;
2321 if (optname == -1 || optname == IPV6_DSTOPTS) {
2322 if (pktopt->ip6po_dest2)
2323 free(pktopt->ip6po_dest2, M_IP6OPT);
2324 pktopt->ip6po_dest2 = NULL;
2328 #define PKTOPT_EXTHDRCPY(type) \
2331 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2332 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2333 if (dst->type == NULL && canwait == M_NOWAIT)\
2335 bcopy(src->type, dst->type, hlen);\
2337 } while (/*CONSTCOND*/ 0)
2340 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2342 if (dst == NULL || src == NULL) {
2343 printf("ip6_clearpktopts: invalid argument\n");
2347 dst->ip6po_hlim = src->ip6po_hlim;
2348 dst->ip6po_tclass = src->ip6po_tclass;
2349 dst->ip6po_flags = src->ip6po_flags;
2350 dst->ip6po_minmtu = src->ip6po_minmtu;
2351 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2352 if (src->ip6po_pktinfo) {
2353 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2355 if (dst->ip6po_pktinfo == NULL)
2357 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2359 if (src->ip6po_nexthop) {
2360 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2362 if (dst->ip6po_nexthop == NULL)
2364 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2365 src->ip6po_nexthop->sa_len);
2367 PKTOPT_EXTHDRCPY(ip6po_hbh);
2368 PKTOPT_EXTHDRCPY(ip6po_dest1);
2369 PKTOPT_EXTHDRCPY(ip6po_dest2);
2370 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2374 ip6_clearpktopts(dst, -1);
2377 #undef PKTOPT_EXTHDRCPY
2379 struct ip6_pktopts *
2380 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2383 struct ip6_pktopts *dst;
2385 dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2388 ip6_initpktopts(dst);
2390 if ((error = copypktopts(dst, src, canwait)) != 0) {
2391 free(dst, M_IP6OPT);
2399 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2404 ip6_clearpktopts(pktopt, -1);
2406 free(pktopt, M_IP6OPT);
2410 * Set IPv6 outgoing packet options based on advanced API.
2413 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2414 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2416 struct cmsghdr *cm = 0;
2418 if (control == NULL || opt == NULL)
2421 ip6_initpktopts(opt);
2426 * If stickyopt is provided, make a local copy of the options
2427 * for this particular packet, then override them by ancillary
2429 * XXX: copypktopts() does not copy the cached route to a next
2430 * hop (if any). This is not very good in terms of efficiency,
2431 * but we can allow this since this option should be rarely
2434 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2439 * XXX: Currently, we assume all the optional information is stored
2442 if (control->m_next)
2445 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2446 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2449 if (control->m_len < CMSG_LEN(0))
2452 cm = mtod(control, struct cmsghdr *);
2453 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2455 if (cm->cmsg_level != IPPROTO_IPV6)
2458 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2459 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2468 * Set a particular packet option, as a sticky option or an ancillary data
2469 * item. "len" can be 0 only when it's a sticky option.
2470 * We have 4 cases of combination of "sticky" and "cmsg":
2471 * "sticky=0, cmsg=0": impossible
2472 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2473 * "sticky=1, cmsg=0": RFC3542 socket option
2474 * "sticky=1, cmsg=1": RFC2292 socket option
2477 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2478 struct ucred *cred, int sticky, int cmsg, int uproto)
2480 int minmtupolicy, preftemp;
2483 if (!sticky && !cmsg) {
2485 printf("ip6_setpktopt: impossible case\n");
2491 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2492 * not be specified in the context of RFC3542. Conversely,
2493 * RFC3542 types should not be specified in the context of RFC2292.
2497 case IPV6_2292PKTINFO:
2498 case IPV6_2292HOPLIMIT:
2499 case IPV6_2292NEXTHOP:
2500 case IPV6_2292HOPOPTS:
2501 case IPV6_2292DSTOPTS:
2502 case IPV6_2292RTHDR:
2503 case IPV6_2292PKTOPTIONS:
2504 return (ENOPROTOOPT);
2507 if (sticky && cmsg) {
2514 case IPV6_RTHDRDSTOPTS:
2516 case IPV6_USE_MIN_MTU:
2519 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2520 return (ENOPROTOOPT);
2525 case IPV6_2292PKTINFO:
2528 struct ifnet *ifp = NULL;
2529 struct in6_pktinfo *pktinfo;
2531 if (len != sizeof(struct in6_pktinfo))
2534 pktinfo = (struct in6_pktinfo *)buf;
2537 * An application can clear any sticky IPV6_PKTINFO option by
2538 * doing a "regular" setsockopt with ipi6_addr being
2539 * in6addr_any and ipi6_ifindex being zero.
2540 * [RFC 3542, Section 6]
2542 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2543 pktinfo->ipi6_ifindex == 0 &&
2544 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2545 ip6_clearpktopts(opt, optname);
2549 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2550 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2554 /* validate the interface index if specified. */
2555 if (pktinfo->ipi6_ifindex > V_if_index)
2557 if (pktinfo->ipi6_ifindex) {
2558 ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2564 * We store the address anyway, and let in6_selectsrc()
2565 * validate the specified address. This is because ipi6_addr
2566 * may not have enough information about its scope zone, and
2567 * we may need additional information (such as outgoing
2568 * interface or the scope zone of a destination address) to
2569 * disambiguate the scope.
2570 * XXX: the delay of the validation may confuse the
2571 * application when it is used as a sticky option.
2573 if (opt->ip6po_pktinfo == NULL) {
2574 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2575 M_IP6OPT, M_NOWAIT);
2576 if (opt->ip6po_pktinfo == NULL)
2579 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2583 case IPV6_2292HOPLIMIT:
2589 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2590 * to simplify the ordering among hoplimit options.
2592 if (optname == IPV6_HOPLIMIT && sticky)
2593 return (ENOPROTOOPT);
2595 if (len != sizeof(int))
2598 if (*hlimp < -1 || *hlimp > 255)
2601 opt->ip6po_hlim = *hlimp;
2609 if (len != sizeof(int))
2611 tclass = *(int *)buf;
2612 if (tclass < -1 || tclass > 255)
2615 opt->ip6po_tclass = tclass;
2619 case IPV6_2292NEXTHOP:
2622 error = priv_check_cred(cred,
2623 PRIV_NETINET_SETHDROPTS, 0);
2628 if (len == 0) { /* just remove the option */
2629 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2633 /* check if cmsg_len is large enough for sa_len */
2634 if (len < sizeof(struct sockaddr) || len < *buf)
2637 switch (((struct sockaddr *)buf)->sa_family) {
2640 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
2643 if (sa6->sin6_len != sizeof(struct sockaddr_in6))
2646 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
2647 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
2650 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
2656 case AF_LINK: /* should eventually be supported */
2658 return (EAFNOSUPPORT);
2661 /* turn off the previous option, then set the new option. */
2662 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2663 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
2664 if (opt->ip6po_nexthop == NULL)
2666 bcopy(buf, opt->ip6po_nexthop, *buf);
2669 case IPV6_2292HOPOPTS:
2672 struct ip6_hbh *hbh;
2676 * XXX: We don't allow a non-privileged user to set ANY HbH
2677 * options, since per-option restriction has too much
2681 error = priv_check_cred(cred,
2682 PRIV_NETINET_SETHDROPTS, 0);
2688 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2689 break; /* just remove the option */
2692 /* message length validation */
2693 if (len < sizeof(struct ip6_hbh))
2695 hbh = (struct ip6_hbh *)buf;
2696 hbhlen = (hbh->ip6h_len + 1) << 3;
2700 /* turn off the previous option, then set the new option. */
2701 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2702 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
2703 if (opt->ip6po_hbh == NULL)
2705 bcopy(hbh, opt->ip6po_hbh, hbhlen);
2710 case IPV6_2292DSTOPTS:
2712 case IPV6_RTHDRDSTOPTS:
2714 struct ip6_dest *dest, **newdest = NULL;
2717 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
2718 error = priv_check_cred(cred,
2719 PRIV_NETINET_SETHDROPTS, 0);
2725 ip6_clearpktopts(opt, optname);
2726 break; /* just remove the option */
2729 /* message length validation */
2730 if (len < sizeof(struct ip6_dest))
2732 dest = (struct ip6_dest *)buf;
2733 destlen = (dest->ip6d_len + 1) << 3;
2738 * Determine the position that the destination options header
2739 * should be inserted; before or after the routing header.
2742 case IPV6_2292DSTOPTS:
2744 * The old advacned API is ambiguous on this point.
2745 * Our approach is to determine the position based
2746 * according to the existence of a routing header.
2747 * Note, however, that this depends on the order of the
2748 * extension headers in the ancillary data; the 1st
2749 * part of the destination options header must appear
2750 * before the routing header in the ancillary data,
2752 * RFC3542 solved the ambiguity by introducing
2753 * separate ancillary data or option types.
2755 if (opt->ip6po_rthdr == NULL)
2756 newdest = &opt->ip6po_dest1;
2758 newdest = &opt->ip6po_dest2;
2760 case IPV6_RTHDRDSTOPTS:
2761 newdest = &opt->ip6po_dest1;
2764 newdest = &opt->ip6po_dest2;
2768 /* turn off the previous option, then set the new option. */
2769 ip6_clearpktopts(opt, optname);
2770 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
2771 if (*newdest == NULL)
2773 bcopy(dest, *newdest, destlen);
2778 case IPV6_2292RTHDR:
2781 struct ip6_rthdr *rth;
2785 ip6_clearpktopts(opt, IPV6_RTHDR);
2786 break; /* just remove the option */
2789 /* message length validation */
2790 if (len < sizeof(struct ip6_rthdr))
2792 rth = (struct ip6_rthdr *)buf;
2793 rthlen = (rth->ip6r_len + 1) << 3;
2797 switch (rth->ip6r_type) {
2798 case IPV6_RTHDR_TYPE_0:
2799 if (rth->ip6r_len == 0) /* must contain one addr */
2801 if (rth->ip6r_len % 2) /* length must be even */
2803 if (rth->ip6r_len / 2 != rth->ip6r_segleft)
2807 return (EINVAL); /* not supported */
2810 /* turn off the previous option */
2811 ip6_clearpktopts(opt, IPV6_RTHDR);
2812 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
2813 if (opt->ip6po_rthdr == NULL)
2815 bcopy(rth, opt->ip6po_rthdr, rthlen);
2820 case IPV6_USE_MIN_MTU:
2821 if (len != sizeof(int))
2823 minmtupolicy = *(int *)buf;
2824 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
2825 minmtupolicy != IP6PO_MINMTU_DISABLE &&
2826 minmtupolicy != IP6PO_MINMTU_ALL) {
2829 opt->ip6po_minmtu = minmtupolicy;
2833 if (len != sizeof(int))
2836 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
2838 * we ignore this option for TCP sockets.
2839 * (RFC3542 leaves this case unspecified.)
2841 opt->ip6po_flags &= ~IP6PO_DONTFRAG;
2843 opt->ip6po_flags |= IP6PO_DONTFRAG;
2846 case IPV6_PREFER_TEMPADDR:
2847 if (len != sizeof(int))
2849 preftemp = *(int *)buf;
2850 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
2851 preftemp != IP6PO_TEMPADDR_NOTPREFER &&
2852 preftemp != IP6PO_TEMPADDR_PREFER) {
2855 opt->ip6po_prefer_tempaddr = preftemp;
2859 return (ENOPROTOOPT);
2860 } /* end of switch */
2866 * Routine called from ip6_output() to loop back a copy of an IP6 multicast
2867 * packet to the input queue of a specified interface. Note that this
2868 * calls the output routine of the loopback "driver", but with an interface
2869 * pointer that might NOT be &loif -- easier than replicating that code here.
2872 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst)
2875 struct ip6_hdr *ip6;
2877 copym = m_copy(m, 0, M_COPYALL);
2882 * Make sure to deep-copy IPv6 header portion in case the data
2883 * is in an mbuf cluster, so that we can safely override the IPv6
2884 * header portion later.
2886 if ((copym->m_flags & M_EXT) != 0 ||
2887 copym->m_len < sizeof(struct ip6_hdr)) {
2888 copym = m_pullup(copym, sizeof(struct ip6_hdr));
2894 if (copym->m_len < sizeof(*ip6)) {
2900 ip6 = mtod(copym, struct ip6_hdr *);
2902 * clear embedded scope identifiers if necessary.
2903 * in6_clearscope will touch the addresses only when necessary.
2905 in6_clearscope(&ip6->ip6_src);
2906 in6_clearscope(&ip6->ip6_dst);
2908 (void)if_simloop(ifp, copym, dst->sin6_family, 0);
2912 * Chop IPv6 header off from the payload.
2915 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
2918 struct ip6_hdr *ip6;
2920 ip6 = mtod(m, struct ip6_hdr *);
2921 if (m->m_len > sizeof(*ip6)) {
2922 mh = m_gethdr(M_NOWAIT, MT_DATA);
2927 m_move_pkthdr(mh, m);
2928 MH_ALIGN(mh, sizeof(*ip6));
2929 m->m_len -= sizeof(*ip6);
2930 m->m_data += sizeof(*ip6);
2933 m->m_len = sizeof(*ip6);
2934 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
2936 exthdrs->ip6e_ip6 = m;
2941 * Compute IPv6 extension header length.
2944 ip6_optlen(struct inpcb *in6p)
2948 if (!in6p->in6p_outputopts)
2953 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
2955 len += elen(in6p->in6p_outputopts->ip6po_hbh);
2956 if (in6p->in6p_outputopts->ip6po_rthdr)
2957 /* dest1 is valid with rthdr only */
2958 len += elen(in6p->in6p_outputopts->ip6po_dest1);
2959 len += elen(in6p->in6p_outputopts->ip6po_rthdr);
2960 len += elen(in6p->in6p_outputopts->ip6po_dest2);