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 * XXX TODO: no flowid is assigned for outbound flows?
234 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
235 struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
236 struct ifnet **ifpp, struct inpcb *inp)
238 struct ip6_hdr *ip6, *mhip6;
239 struct ifnet *ifp, *origifp;
241 struct mbuf *mprev = NULL;
242 int hlen, tlen, len, off;
243 struct route_in6 ip6route;
244 struct rtentry *rt = NULL;
245 struct sockaddr_in6 *dst, src_sa, dst_sa;
246 struct in6_addr odst;
248 struct in6_ifaddr *ia = NULL;
250 int alwaysfrag, dontfrag;
251 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
252 struct ip6_exthdrs exthdrs;
253 struct in6_addr finaldst, src0, dst0;
255 struct route_in6 *ro_pmtu = NULL;
260 struct m_tag *fwd_tag = NULL;
262 ip6 = mtod(m, struct ip6_hdr *);
264 printf ("ip6 is NULL");
269 M_SETFIB(m, inp->inp_inc.inc_fibnum);
270 if (((flags & IP_NODEFAULTFLOWID) == 0) &&
271 (inp->inp_flags & (INP_HW_FLOWID|INP_SW_FLOWID))) {
272 m->m_pkthdr.flowid = inp->inp_flowid;
273 m->m_flags |= M_FLOWID;
277 finaldst = ip6->ip6_dst;
278 bzero(&exthdrs, sizeof(exthdrs));
280 /* Hop-by-Hop options header */
281 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
282 /* Destination options header(1st part) */
283 if (opt->ip6po_rthdr) {
285 * Destination options header(1st part)
286 * This only makes sense with a routing header.
287 * See Section 9.2 of RFC 3542.
288 * Disabling this part just for MIP6 convenience is
289 * a bad idea. We need to think carefully about a
290 * way to make the advanced API coexist with MIP6
291 * options, which might automatically be inserted in
294 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
297 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
298 /* Destination options header(2nd part) */
299 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
304 * IPSec checking which handles several cases.
305 * FAST IPSEC: We re-injected the packet.
307 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp))
309 case 1: /* Bad packet */
311 case -1: /* IPSec done */
313 case 0: /* No IPSec */
320 * Calculate the total length of the extension header chain.
321 * Keep the length of the unfragmentable part for fragmentation.
324 if (exthdrs.ip6e_hbh)
325 optlen += exthdrs.ip6e_hbh->m_len;
326 if (exthdrs.ip6e_dest1)
327 optlen += exthdrs.ip6e_dest1->m_len;
328 if (exthdrs.ip6e_rthdr)
329 optlen += exthdrs.ip6e_rthdr->m_len;
330 unfragpartlen = optlen + sizeof(struct ip6_hdr);
332 /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */
333 if (exthdrs.ip6e_dest2)
334 optlen += exthdrs.ip6e_dest2->m_len;
337 * If there is at least one extension header,
338 * separate IP6 header from the payload.
340 if (optlen && !hdrsplit) {
341 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
345 m = exthdrs.ip6e_ip6;
350 ip6 = mtod(m, struct ip6_hdr *);
352 /* adjust mbuf packet header length */
353 m->m_pkthdr.len += optlen;
354 plen = m->m_pkthdr.len - sizeof(*ip6);
356 /* If this is a jumbo payload, insert a jumbo payload option. */
357 if (plen > IPV6_MAXPACKET) {
359 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
363 m = exthdrs.ip6e_ip6;
367 ip6 = mtod(m, struct ip6_hdr *);
368 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
372 ip6->ip6_plen = htons(plen);
375 * Concatenate headers and fill in next header fields.
376 * Here we have, on "m"
378 * and we insert headers accordingly. Finally, we should be getting:
379 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
381 * during the header composing process, "m" points to IPv6 header.
382 * "mprev" points to an extension header prior to esp.
384 u_char *nexthdrp = &ip6->ip6_nxt;
388 * we treat dest2 specially. this makes IPsec processing
389 * much easier. the goal here is to make mprev point the
390 * mbuf prior to dest2.
392 * result: IPv6 dest2 payload
393 * m and mprev will point to IPv6 header.
395 if (exthdrs.ip6e_dest2) {
397 panic("assumption failed: hdr not split");
398 exthdrs.ip6e_dest2->m_next = m->m_next;
399 m->m_next = exthdrs.ip6e_dest2;
400 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
401 ip6->ip6_nxt = IPPROTO_DSTOPTS;
405 * result: IPv6 hbh dest1 rthdr dest2 payload
406 * m will point to IPv6 header. mprev will point to the
407 * extension header prior to dest2 (rthdr in the above case).
409 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
410 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
412 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
416 * If there is a routing header, discard the packet.
418 if (exthdrs.ip6e_rthdr) {
423 /* Source address validation */
424 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
425 (flags & IPV6_UNSPECSRC) == 0) {
427 IP6STAT_INC(ip6s_badscope);
430 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
432 IP6STAT_INC(ip6s_badscope);
436 IP6STAT_INC(ip6s_localout);
443 bzero((caddr_t)ro, sizeof(*ro));
446 if (opt && opt->ip6po_rthdr)
447 ro = &opt->ip6po_route;
448 dst = (struct sockaddr_in6 *)&ro->ro_dst;
450 if (ro->ro_rt == NULL)
451 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro);
453 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
456 * if specified, try to fill in the traffic class field.
457 * do not override if a non-zero value is already set.
458 * we check the diffserv field and the ecn field separately.
460 if (opt && opt->ip6po_tclass >= 0) {
463 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
465 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
468 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
471 /* fill in or override the hop limit field, if necessary. */
472 if (opt && opt->ip6po_hlim != -1)
473 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
474 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
476 ip6->ip6_hlim = im6o->im6o_multicast_hlim;
478 ip6->ip6_hlim = V_ip6_defmcasthlim;
482 ip6 = mtod(m, struct ip6_hdr *);
484 if (ro->ro_rt && fwd_tag == NULL) {
486 ifp = ro->ro_rt->rt_ifp;
488 if (fwd_tag == NULL) {
489 bzero(&dst_sa, sizeof(dst_sa));
490 dst_sa.sin6_family = AF_INET6;
491 dst_sa.sin6_len = sizeof(dst_sa);
492 dst_sa.sin6_addr = ip6->ip6_dst;
494 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp,
498 in6_ifstat_inc(ifp, ifs6_out_discard);
504 * If in6_selectroute() does not return a route entry,
505 * dst may not have been updated.
507 *dst = dst_sa; /* XXX */
511 * then rt (for unicast) and ifp must be non-NULL valid values.
513 if ((flags & IPV6_FORWARDING) == 0) {
514 /* XXX: the FORWARDING flag can be set for mrouting. */
515 in6_ifstat_inc(ifp, ifs6_out_request);
518 ia = (struct in6_ifaddr *)(rt->rt_ifa);
519 counter_u64_add(rt->rt_pksent, 1);
524 * The outgoing interface must be in the zone of source and
525 * destination addresses.
530 if (in6_setscope(&src0, origifp, &zone))
532 bzero(&src_sa, sizeof(src_sa));
533 src_sa.sin6_family = AF_INET6;
534 src_sa.sin6_len = sizeof(src_sa);
535 src_sa.sin6_addr = ip6->ip6_src;
536 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
540 if (in6_setscope(&dst0, origifp, &zone))
542 /* re-initialize to be sure */
543 bzero(&dst_sa, sizeof(dst_sa));
544 dst_sa.sin6_family = AF_INET6;
545 dst_sa.sin6_len = sizeof(dst_sa);
546 dst_sa.sin6_addr = ip6->ip6_dst;
547 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) {
551 /* We should use ia_ifp to support the case of
552 * sending packets to an address of our own.
554 if (ia != NULL && ia->ia_ifp)
557 /* scope check is done. */
561 IP6STAT_INC(ip6s_badscope);
562 in6_ifstat_inc(origifp, ifs6_out_discard);
564 error = EHOSTUNREACH; /* XXX */
568 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
569 if (opt && opt->ip6po_nextroute.ro_rt) {
571 * The nexthop is explicitly specified by the
572 * application. We assume the next hop is an IPv6
575 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
577 else if ((rt->rt_flags & RTF_GATEWAY))
578 dst = (struct sockaddr_in6 *)rt->rt_gateway;
581 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
582 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
584 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
585 in6_ifstat_inc(ifp, ifs6_out_mcast);
587 * Confirm that the outgoing interface supports multicast.
589 if (!(ifp->if_flags & IFF_MULTICAST)) {
590 IP6STAT_INC(ip6s_noroute);
591 in6_ifstat_inc(ifp, ifs6_out_discard);
595 if ((im6o == NULL && in6_mcast_loop) ||
596 (im6o && im6o->im6o_multicast_loop)) {
598 * Loop back multicast datagram if not expressly
599 * forbidden to do so, even if we have not joined
600 * the address; protocols will filter it later,
601 * thus deferring a hash lookup and lock acquisition
602 * at the expense of an m_copym().
604 ip6_mloopback(ifp, m, dst);
607 * If we are acting as a multicast router, perform
608 * multicast forwarding as if the packet had just
609 * arrived on the interface to which we are about
610 * to send. The multicast forwarding function
611 * recursively calls this function, using the
612 * IPV6_FORWARDING flag to prevent infinite recursion.
614 * Multicasts that are looped back by ip6_mloopback(),
615 * above, will be forwarded by the ip6_input() routine,
618 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
620 * XXX: ip6_mforward expects that rcvif is NULL
621 * when it is called from the originating path.
622 * However, it may not always be the case.
624 m->m_pkthdr.rcvif = NULL;
625 if (ip6_mforward(ip6, ifp, m) != 0) {
632 * Multicasts with a hoplimit of zero may be looped back,
633 * above, but must not be transmitted on a network.
634 * Also, multicasts addressed to the loopback interface
635 * are not sent -- the above call to ip6_mloopback() will
636 * loop back a copy if this host actually belongs to the
637 * destination group on the loopback interface.
639 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
640 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
647 * Fill the outgoing inteface to tell the upper layer
648 * to increment per-interface statistics.
653 /* Determine path MTU. */
654 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu,
655 &alwaysfrag, fibnum)) != 0)
659 * The caller of this function may specify to use the minimum MTU
661 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
662 * setting. The logic is a bit complicated; by default, unicast
663 * packets will follow path MTU while multicast packets will be sent at
664 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
665 * including unicast ones will be sent at the minimum MTU. Multicast
666 * packets will always be sent at the minimum MTU unless
667 * IP6PO_MINMTU_DISABLE is explicitly specified.
668 * See RFC 3542 for more details.
670 if (mtu > IPV6_MMTU) {
671 if ((flags & IPV6_MINMTU))
673 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
675 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
677 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
683 * clear embedded scope identifiers if necessary.
684 * in6_clearscope will touch the addresses only when necessary.
686 in6_clearscope(&ip6->ip6_src);
687 in6_clearscope(&ip6->ip6_dst);
690 * If the outgoing packet contains a hop-by-hop options header,
691 * it must be examined and processed even by the source node.
692 * (RFC 2460, section 4.)
694 if (exthdrs.ip6e_hbh) {
695 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
696 u_int32_t dummy; /* XXX unused */
697 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
700 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
701 panic("ip6e_hbh is not contiguous");
704 * XXX: if we have to send an ICMPv6 error to the sender,
705 * we need the M_LOOP flag since icmp6_error() expects
706 * the IPv6 and the hop-by-hop options header are
707 * contiguous unless the flag is set.
709 m->m_flags |= M_LOOP;
710 m->m_pkthdr.rcvif = ifp;
711 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
712 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
713 &dummy, &plen) < 0) {
714 /* m was already freed at this point */
715 error = EINVAL;/* better error? */
718 m->m_flags &= ~M_LOOP; /* XXX */
719 m->m_pkthdr.rcvif = NULL;
722 /* Jump over all PFIL processing if hooks are not active. */
723 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
727 /* Run through list of hooks for output packets. */
728 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp);
729 if (error != 0 || m == NULL)
731 ip6 = mtod(m, struct ip6_hdr *);
734 /* See if destination IP address was changed by packet filter. */
735 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
736 m->m_flags |= M_SKIP_FIREWALL;
737 /* If destination is now ourself drop to ip6_input(). */
738 if (in6_localip(&ip6->ip6_dst)) {
739 m->m_flags |= M_FASTFWD_OURS;
740 if (m->m_pkthdr.rcvif == NULL)
741 m->m_pkthdr.rcvif = V_loif;
742 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
743 m->m_pkthdr.csum_flags |=
744 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
745 m->m_pkthdr.csum_data = 0xffff;
748 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
749 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
751 error = netisr_queue(NETISR_IPV6, m);
754 needfiblookup = 1; /* Redo the routing table lookup. */
756 /* See if fib was changed by packet filter. */
757 if (fibnum != M_GETFIB(m)) {
758 m->m_flags |= M_SKIP_FIREWALL;
759 fibnum = M_GETFIB(m);
766 /* See if local, if yes, send it to netisr. */
767 if (m->m_flags & M_FASTFWD_OURS) {
768 if (m->m_pkthdr.rcvif == NULL)
769 m->m_pkthdr.rcvif = V_loif;
770 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
771 m->m_pkthdr.csum_flags |=
772 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
773 m->m_pkthdr.csum_data = 0xffff;
776 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
777 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
779 error = netisr_queue(NETISR_IPV6, m);
782 /* Or forward to some other address? */
783 if ((m->m_flags & M_IP6_NEXTHOP) &&
784 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
785 dst = (struct sockaddr_in6 *)&ro->ro_dst;
786 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
787 m->m_flags |= M_SKIP_FIREWALL;
788 m->m_flags &= ~M_IP6_NEXTHOP;
789 m_tag_delete(m, fwd_tag);
795 * Send the packet to the outgoing interface.
796 * If necessary, do IPv6 fragmentation before sending.
798 * the logic here is rather complex:
799 * 1: normal case (dontfrag == 0, alwaysfrag == 0)
800 * 1-a: send as is if tlen <= path mtu
801 * 1-b: fragment if tlen > path mtu
803 * 2: if user asks us not to fragment (dontfrag == 1)
804 * 2-a: send as is if tlen <= interface mtu
805 * 2-b: error if tlen > interface mtu
807 * 3: if we always need to attach fragment header (alwaysfrag == 1)
810 * 4: if dontfrag == 1 && alwaysfrag == 1
811 * error, as we cannot handle this conflicting request
813 sw_csum = m->m_pkthdr.csum_flags;
815 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0;
816 sw_csum &= ~ifp->if_hwassist;
820 * If we added extension headers, we will not do TSO and calculate the
821 * checksums ourselves for now.
822 * XXX-BZ Need a framework to know when the NIC can handle it, even
825 if (sw_csum & CSUM_DELAY_DATA_IPV6) {
826 sw_csum &= ~CSUM_DELAY_DATA_IPV6;
827 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
830 if (sw_csum & CSUM_SCTP_IPV6) {
831 sw_csum &= ~CSUM_SCTP_IPV6;
832 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
835 m->m_pkthdr.csum_flags &= ifp->if_hwassist;
836 tlen = m->m_pkthdr.len;
838 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
842 if (dontfrag && alwaysfrag) { /* case 4 */
843 /* conflicting request - can't transmit */
847 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */
849 * Even if the DONTFRAG option is specified, we cannot send the
850 * packet when the data length is larger than the MTU of the
851 * outgoing interface.
852 * Notify the error by sending IPV6_PATHMTU ancillary data as
853 * well as returning an error code (the latter is not described
857 struct ip6ctlparam ip6cp;
859 mtu32 = (u_int32_t)mtu;
860 bzero(&ip6cp, sizeof(ip6cp));
861 ip6cp.ip6c_cmdarg = (void *)&mtu32;
862 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
870 * transmit packet without fragmentation
872 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
873 struct in6_ifaddr *ia6;
875 ip6 = mtod(m, struct ip6_hdr *);
876 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
878 /* Record statistics for this interface address. */
879 counter_u64_add(ia6->ia_ifa.ifa_opackets, 1);
880 counter_u64_add(ia6->ia_ifa.ifa_obytes,
882 ifa_free(&ia6->ia_ifa);
884 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
889 * try to fragment the packet. case 1-b and 3
891 if (mtu < IPV6_MMTU) {
892 /* path MTU cannot be less than IPV6_MMTU */
894 in6_ifstat_inc(ifp, ifs6_out_fragfail);
896 } else if (ip6->ip6_plen == 0) {
897 /* jumbo payload cannot be fragmented */
899 in6_ifstat_inc(ifp, ifs6_out_fragfail);
902 struct mbuf **mnext, *m_frgpart;
903 struct ip6_frag *ip6f;
904 u_int32_t id = htonl(ip6_randomid());
907 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len;
910 * Too large for the destination or interface;
911 * fragment if possible.
912 * Must be able to put at least 8 bytes per fragment.
914 hlen = unfragpartlen;
915 if (mtu > IPV6_MAXPACKET)
916 mtu = IPV6_MAXPACKET;
918 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
921 in6_ifstat_inc(ifp, ifs6_out_fragfail);
926 * Verify that we have any chance at all of being able to queue
927 * the packet or packet fragments
929 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen)
930 < tlen /* - hlen */)) {
932 IP6STAT_INC(ip6s_odropped);
938 * If the interface will not calculate checksums on
939 * fragmented packets, then do it here.
940 * XXX-BZ handle the hw offloading case. Need flags.
942 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
943 in6_delayed_cksum(m, plen, hlen);
944 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
947 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
948 sctp_delayed_cksum(m, hlen);
949 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
952 mnext = &m->m_nextpkt;
955 * Change the next header field of the last header in the
956 * unfragmentable part.
958 if (exthdrs.ip6e_rthdr) {
959 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
960 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
961 } else if (exthdrs.ip6e_dest1) {
962 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
963 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
964 } else if (exthdrs.ip6e_hbh) {
965 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
966 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
968 nextproto = ip6->ip6_nxt;
969 ip6->ip6_nxt = IPPROTO_FRAGMENT;
973 * Loop through length of segment after first fragment,
974 * make new header and copy data of each part and link onto
978 for (off = hlen; off < tlen; off += len) {
979 m = m_gethdr(M_NOWAIT, MT_DATA);
982 IP6STAT_INC(ip6s_odropped);
985 m->m_flags = m0->m_flags & M_COPYFLAGS;
987 mnext = &m->m_nextpkt;
988 m->m_data += max_linkhdr;
989 mhip6 = mtod(m, struct ip6_hdr *);
991 m->m_len = sizeof(*mhip6);
992 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
994 IP6STAT_INC(ip6s_odropped);
997 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
998 if (off + len >= tlen)
1001 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
1002 mhip6->ip6_plen = htons((u_short)(len + hlen +
1003 sizeof(*ip6f) - sizeof(struct ip6_hdr)));
1004 if ((m_frgpart = m_copy(m0, off, len)) == 0) {
1006 IP6STAT_INC(ip6s_odropped);
1009 m_cat(m, m_frgpart);
1010 m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
1011 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum;
1012 m->m_pkthdr.rcvif = NULL;
1013 ip6f->ip6f_reserved = 0;
1014 ip6f->ip6f_ident = id;
1015 ip6f->ip6f_nxt = nextproto;
1016 IP6STAT_INC(ip6s_ofragments);
1017 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
1020 in6_ifstat_inc(ifp, ifs6_out_fragok);
1024 * Remove leading garbages.
1030 for (m0 = m; m; m = m0) {
1034 /* Record statistics for this interface address. */
1036 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
1037 counter_u64_add(ia->ia_ifa.ifa_obytes,
1040 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
1046 IP6STAT_INC(ip6s_fragmented);
1049 if (ro == &ip6route)
1051 if (ro_pmtu == &ip6route)
1056 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */
1057 m_freem(exthdrs.ip6e_dest1);
1058 m_freem(exthdrs.ip6e_rthdr);
1059 m_freem(exthdrs.ip6e_dest2);
1068 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1072 if (hlen > MCLBYTES)
1073 return (ENOBUFS); /* XXX */
1076 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1078 m = m_get(M_NOWAIT, MT_DATA);
1083 bcopy(hdr, mtod(m, caddr_t), hlen);
1090 * Insert jumbo payload option.
1093 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1099 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */
1102 * If there is no hop-by-hop options header, allocate new one.
1103 * If there is one but it doesn't have enough space to store the
1104 * jumbo payload option, allocate a cluster to store the whole options.
1105 * Otherwise, use it to store the options.
1107 if (exthdrs->ip6e_hbh == 0) {
1108 mopt = m_get(M_NOWAIT, MT_DATA);
1111 mopt->m_len = JUMBOOPTLEN;
1112 optbuf = mtod(mopt, u_char *);
1113 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */
1114 exthdrs->ip6e_hbh = mopt;
1116 struct ip6_hbh *hbh;
1118 mopt = exthdrs->ip6e_hbh;
1119 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1122 * - exthdrs->ip6e_hbh is not referenced from places
1123 * other than exthdrs.
1124 * - exthdrs->ip6e_hbh is not an mbuf chain.
1126 int oldoptlen = mopt->m_len;
1130 * XXX: give up if the whole (new) hbh header does
1131 * not fit even in an mbuf cluster.
1133 if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1137 * As a consequence, we must always prepare a cluster
1140 n = m_getcl(M_NOWAIT, MT_DATA, 0);
1143 n->m_len = oldoptlen + JUMBOOPTLEN;
1144 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
1146 optbuf = mtod(n, caddr_t) + oldoptlen;
1148 mopt = exthdrs->ip6e_hbh = n;
1150 optbuf = mtod(mopt, u_char *) + mopt->m_len;
1151 mopt->m_len += JUMBOOPTLEN;
1153 optbuf[0] = IP6OPT_PADN;
1157 * Adjust the header length according to the pad and
1158 * the jumbo payload option.
1160 hbh = mtod(mopt, struct ip6_hbh *);
1161 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1164 /* fill in the option. */
1165 optbuf[2] = IP6OPT_JUMBO;
1167 v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1168 bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1170 /* finally, adjust the packet header length */
1171 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1178 * Insert fragment header and copy unfragmentable header portions.
1181 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1182 struct ip6_frag **frghdrp)
1184 struct mbuf *n, *mlast;
1186 if (hlen > sizeof(struct ip6_hdr)) {
1187 n = m_copym(m0, sizeof(struct ip6_hdr),
1188 hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1195 /* Search for the last mbuf of unfragmentable part. */
1196 for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1199 if (M_WRITABLE(mlast) &&
1200 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1201 /* use the trailing space of the last mbuf for the fragment hdr */
1202 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1204 mlast->m_len += sizeof(struct ip6_frag);
1205 m->m_pkthdr.len += sizeof(struct ip6_frag);
1207 /* allocate a new mbuf for the fragment header */
1210 mfrg = m_get(M_NOWAIT, MT_DATA);
1213 mfrg->m_len = sizeof(struct ip6_frag);
1214 *frghdrp = mtod(mfrg, struct ip6_frag *);
1215 mlast->m_next = mfrg;
1222 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro,
1223 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup,
1224 int *alwaysfragp, u_int fibnum)
1230 if (ro_pmtu != ro) {
1231 /* The first hop and the final destination may differ. */
1232 struct sockaddr_in6 *sa6_dst =
1233 (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1234 if (ro_pmtu->ro_rt &&
1235 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 ||
1236 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) {
1237 RTFREE(ro_pmtu->ro_rt);
1238 ro_pmtu->ro_rt = (struct rtentry *)NULL;
1240 if (ro_pmtu->ro_rt == NULL) {
1241 bzero(sa6_dst, sizeof(*sa6_dst));
1242 sa6_dst->sin6_family = AF_INET6;
1243 sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1244 sa6_dst->sin6_addr = *dst;
1246 in6_rtalloc(ro_pmtu, fibnum);
1249 if (ro_pmtu->ro_rt) {
1251 struct in_conninfo inc;
1253 bzero(&inc, sizeof(inc));
1254 inc.inc_flags |= INC_ISIPV6;
1255 inc.inc6_faddr = *dst;
1258 ifp = ro_pmtu->ro_rt->rt_ifp;
1259 ifmtu = IN6_LINKMTU(ifp);
1260 mtu = tcp_hc_getmtu(&inc);
1262 mtu = min(mtu, ro_pmtu->ro_rt->rt_mtu);
1264 mtu = ro_pmtu->ro_rt->rt_mtu;
1267 else if (mtu < IPV6_MMTU) {
1269 * RFC2460 section 5, last paragraph:
1270 * if we record ICMPv6 too big message with
1271 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1272 * or smaller, with framgent header attached.
1273 * (fragment header is needed regardless from the
1274 * packet size, for translators to identify packets)
1280 mtu = IN6_LINKMTU(ifp);
1282 error = EHOSTUNREACH; /* XXX */
1286 *alwaysfragp = alwaysfrag;
1291 * IP6 socket option processing.
1294 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1296 int optdatalen, uproto;
1298 struct inpcb *in6p = sotoinpcb(so);
1300 int level, op, optname;
1304 uint32_t rss_bucket;
1308 level = sopt->sopt_level;
1309 op = sopt->sopt_dir;
1310 optname = sopt->sopt_name;
1311 optlen = sopt->sopt_valsize;
1315 uproto = (int)so->so_proto->pr_protocol;
1317 if (level != IPPROTO_IPV6) {
1320 if (sopt->sopt_level == SOL_SOCKET &&
1321 sopt->sopt_dir == SOPT_SET) {
1322 switch (sopt->sopt_name) {
1325 if ((so->so_options & SO_REUSEADDR) != 0)
1326 in6p->inp_flags2 |= INP_REUSEADDR;
1328 in6p->inp_flags2 &= ~INP_REUSEADDR;
1334 if ((so->so_options & SO_REUSEPORT) != 0)
1335 in6p->inp_flags2 |= INP_REUSEPORT;
1337 in6p->inp_flags2 &= ~INP_REUSEPORT;
1343 in6p->inp_inc.inc_fibnum = so->so_fibnum;
1351 } else { /* level == IPPROTO_IPV6 */
1356 case IPV6_2292PKTOPTIONS:
1357 #ifdef IPV6_PKTOPTIONS
1358 case IPV6_PKTOPTIONS:
1363 error = soopt_getm(sopt, &m); /* XXX */
1366 error = soopt_mcopyin(sopt, m); /* XXX */
1369 error = ip6_pcbopts(&in6p->in6p_outputopts,
1371 m_freem(m); /* XXX */
1376 * Use of some Hop-by-Hop options or some
1377 * Destination options, might require special
1378 * privilege. That is, normal applications
1379 * (without special privilege) might be forbidden
1380 * from setting certain options in outgoing packets,
1381 * and might never see certain options in received
1382 * packets. [RFC 2292 Section 6]
1383 * KAME specific note:
1384 * KAME prevents non-privileged users from sending or
1385 * receiving ANY hbh/dst options in order to avoid
1386 * overhead of parsing options in the kernel.
1388 case IPV6_RECVHOPOPTS:
1389 case IPV6_RECVDSTOPTS:
1390 case IPV6_RECVRTHDRDSTOPTS:
1392 error = priv_check(td,
1393 PRIV_NETINET_SETHDROPTS);
1398 case IPV6_UNICAST_HOPS:
1401 case IPV6_RECVPKTINFO:
1402 case IPV6_RECVHOPLIMIT:
1403 case IPV6_RECVRTHDR:
1404 case IPV6_RECVPATHMTU:
1405 case IPV6_RECVTCLASS:
1407 case IPV6_AUTOFLOWLABEL:
1409 case IPV6_BINDMULTI:
1411 case IPV6_RSS_LISTEN_BUCKET:
1413 if (optname == IPV6_BINDANY && td != NULL) {
1414 error = priv_check(td,
1415 PRIV_NETINET_BINDANY);
1420 if (optlen != sizeof(int)) {
1424 error = sooptcopyin(sopt, &optval,
1425 sizeof optval, sizeof optval);
1430 case IPV6_UNICAST_HOPS:
1431 if (optval < -1 || optval >= 256)
1434 /* -1 = kernel default */
1435 in6p->in6p_hops = optval;
1436 if ((in6p->inp_vflag &
1438 in6p->inp_ip_ttl = optval;
1441 #define OPTSET(bit) \
1445 in6p->inp_flags |= (bit); \
1447 in6p->inp_flags &= ~(bit); \
1448 INP_WUNLOCK(in6p); \
1449 } while (/*CONSTCOND*/ 0)
1450 #define OPTSET2292(bit) \
1453 in6p->inp_flags |= IN6P_RFC2292; \
1455 in6p->inp_flags |= (bit); \
1457 in6p->inp_flags &= ~(bit); \
1458 INP_WUNLOCK(in6p); \
1459 } while (/*CONSTCOND*/ 0)
1460 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0)
1462 #define OPTSET2(bit, val) do { \
1465 in6p->inp_flags2 |= bit; \
1467 in6p->inp_flags2 &= ~bit; \
1468 INP_WUNLOCK(in6p); \
1470 #define OPTBIT2(bit) (in6p->inp_flags2 & (bit) ? 1 : 0)
1472 case IPV6_RECVPKTINFO:
1473 /* cannot mix with RFC2292 */
1474 if (OPTBIT(IN6P_RFC2292)) {
1478 OPTSET(IN6P_PKTINFO);
1483 struct ip6_pktopts **optp;
1485 /* cannot mix with RFC2292 */
1486 if (OPTBIT(IN6P_RFC2292)) {
1490 optp = &in6p->in6p_outputopts;
1491 error = ip6_pcbopt(IPV6_HOPLIMIT,
1492 (u_char *)&optval, sizeof(optval),
1493 optp, (td != NULL) ? td->td_ucred :
1498 case IPV6_RECVHOPLIMIT:
1499 /* cannot mix with RFC2292 */
1500 if (OPTBIT(IN6P_RFC2292)) {
1504 OPTSET(IN6P_HOPLIMIT);
1507 case IPV6_RECVHOPOPTS:
1508 /* cannot mix with RFC2292 */
1509 if (OPTBIT(IN6P_RFC2292)) {
1513 OPTSET(IN6P_HOPOPTS);
1516 case IPV6_RECVDSTOPTS:
1517 /* cannot mix with RFC2292 */
1518 if (OPTBIT(IN6P_RFC2292)) {
1522 OPTSET(IN6P_DSTOPTS);
1525 case IPV6_RECVRTHDRDSTOPTS:
1526 /* cannot mix with RFC2292 */
1527 if (OPTBIT(IN6P_RFC2292)) {
1531 OPTSET(IN6P_RTHDRDSTOPTS);
1534 case IPV6_RECVRTHDR:
1535 /* cannot mix with RFC2292 */
1536 if (OPTBIT(IN6P_RFC2292)) {
1543 case IPV6_RECVPATHMTU:
1545 * We ignore this option for TCP
1547 * (RFC3542 leaves this case
1550 if (uproto != IPPROTO_TCP)
1556 * make setsockopt(IPV6_V6ONLY)
1557 * available only prior to bind(2).
1558 * see ipng mailing list, Jun 22 2001.
1560 if (in6p->inp_lport ||
1561 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1565 OPTSET(IN6P_IPV6_V6ONLY);
1567 in6p->inp_vflag &= ~INP_IPV4;
1569 in6p->inp_vflag |= INP_IPV4;
1571 case IPV6_RECVTCLASS:
1572 /* cannot mix with RFC2292 XXX */
1573 if (OPTBIT(IN6P_RFC2292)) {
1577 OPTSET(IN6P_TCLASS);
1579 case IPV6_AUTOFLOWLABEL:
1580 OPTSET(IN6P_AUTOFLOWLABEL);
1584 OPTSET(INP_BINDANY);
1587 case IPV6_BINDMULTI:
1588 OPTSET2(INP_BINDMULTI, optval);
1591 case IPV6_RSS_LISTEN_BUCKET:
1592 if ((optval >= 0) &&
1593 (optval < rss_getnumbuckets())) {
1594 in6p->inp_rss_listen_bucket = optval;
1595 OPTSET2(INP_RSS_BUCKET_SET, 1);
1606 case IPV6_USE_MIN_MTU:
1607 case IPV6_PREFER_TEMPADDR:
1608 if (optlen != sizeof(optval)) {
1612 error = sooptcopyin(sopt, &optval,
1613 sizeof optval, sizeof optval);
1617 struct ip6_pktopts **optp;
1618 optp = &in6p->in6p_outputopts;
1619 error = ip6_pcbopt(optname,
1620 (u_char *)&optval, sizeof(optval),
1621 optp, (td != NULL) ? td->td_ucred :
1626 case IPV6_2292PKTINFO:
1627 case IPV6_2292HOPLIMIT:
1628 case IPV6_2292HOPOPTS:
1629 case IPV6_2292DSTOPTS:
1630 case IPV6_2292RTHDR:
1632 if (optlen != sizeof(int)) {
1636 error = sooptcopyin(sopt, &optval,
1637 sizeof optval, sizeof optval);
1641 case IPV6_2292PKTINFO:
1642 OPTSET2292(IN6P_PKTINFO);
1644 case IPV6_2292HOPLIMIT:
1645 OPTSET2292(IN6P_HOPLIMIT);
1647 case IPV6_2292HOPOPTS:
1649 * Check super-user privilege.
1650 * See comments for IPV6_RECVHOPOPTS.
1653 error = priv_check(td,
1654 PRIV_NETINET_SETHDROPTS);
1658 OPTSET2292(IN6P_HOPOPTS);
1660 case IPV6_2292DSTOPTS:
1662 error = priv_check(td,
1663 PRIV_NETINET_SETHDROPTS);
1667 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1669 case IPV6_2292RTHDR:
1670 OPTSET2292(IN6P_RTHDR);
1678 case IPV6_RTHDRDSTOPTS:
1681 /* new advanced API (RFC3542) */
1683 u_char optbuf_storage[MCLBYTES];
1685 struct ip6_pktopts **optp;
1687 /* cannot mix with RFC2292 */
1688 if (OPTBIT(IN6P_RFC2292)) {
1694 * We only ensure valsize is not too large
1695 * here. Further validation will be done
1698 error = sooptcopyin(sopt, optbuf_storage,
1699 sizeof(optbuf_storage), 0);
1702 optlen = sopt->sopt_valsize;
1703 optbuf = optbuf_storage;
1704 optp = &in6p->in6p_outputopts;
1705 error = ip6_pcbopt(optname, optbuf, optlen,
1706 optp, (td != NULL) ? td->td_ucred : NULL,
1712 case IPV6_MULTICAST_IF:
1713 case IPV6_MULTICAST_HOPS:
1714 case IPV6_MULTICAST_LOOP:
1715 case IPV6_JOIN_GROUP:
1716 case IPV6_LEAVE_GROUP:
1718 case MCAST_BLOCK_SOURCE:
1719 case MCAST_UNBLOCK_SOURCE:
1720 case MCAST_JOIN_GROUP:
1721 case MCAST_LEAVE_GROUP:
1722 case MCAST_JOIN_SOURCE_GROUP:
1723 case MCAST_LEAVE_SOURCE_GROUP:
1724 error = ip6_setmoptions(in6p, sopt);
1727 case IPV6_PORTRANGE:
1728 error = sooptcopyin(sopt, &optval,
1729 sizeof optval, sizeof optval);
1735 case IPV6_PORTRANGE_DEFAULT:
1736 in6p->inp_flags &= ~(INP_LOWPORT);
1737 in6p->inp_flags &= ~(INP_HIGHPORT);
1740 case IPV6_PORTRANGE_HIGH:
1741 in6p->inp_flags &= ~(INP_LOWPORT);
1742 in6p->inp_flags |= INP_HIGHPORT;
1745 case IPV6_PORTRANGE_LOW:
1746 in6p->inp_flags &= ~(INP_HIGHPORT);
1747 in6p->inp_flags |= INP_LOWPORT;
1758 case IPV6_IPSEC_POLICY:
1763 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1765 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
1767 req = mtod(m, caddr_t);
1768 error = ipsec_set_policy(in6p, optname, req,
1769 m->m_len, (sopt->sopt_td != NULL) ?
1770 sopt->sopt_td->td_ucred : NULL);
1777 error = ENOPROTOOPT;
1785 case IPV6_2292PKTOPTIONS:
1786 #ifdef IPV6_PKTOPTIONS
1787 case IPV6_PKTOPTIONS:
1790 * RFC3542 (effectively) deprecated the
1791 * semantics of the 2292-style pktoptions.
1792 * Since it was not reliable in nature (i.e.,
1793 * applications had to expect the lack of some
1794 * information after all), it would make sense
1795 * to simplify this part by always returning
1798 sopt->sopt_valsize = 0;
1801 case IPV6_RECVHOPOPTS:
1802 case IPV6_RECVDSTOPTS:
1803 case IPV6_RECVRTHDRDSTOPTS:
1804 case IPV6_UNICAST_HOPS:
1805 case IPV6_RECVPKTINFO:
1806 case IPV6_RECVHOPLIMIT:
1807 case IPV6_RECVRTHDR:
1808 case IPV6_RECVPATHMTU:
1811 case IPV6_PORTRANGE:
1812 case IPV6_RECVTCLASS:
1813 case IPV6_AUTOFLOWLABEL:
1818 case IPV6_RSSBUCKETID:
1822 case IPV6_RECVHOPOPTS:
1823 optval = OPTBIT(IN6P_HOPOPTS);
1826 case IPV6_RECVDSTOPTS:
1827 optval = OPTBIT(IN6P_DSTOPTS);
1830 case IPV6_RECVRTHDRDSTOPTS:
1831 optval = OPTBIT(IN6P_RTHDRDSTOPTS);
1834 case IPV6_UNICAST_HOPS:
1835 optval = in6p->in6p_hops;
1838 case IPV6_RECVPKTINFO:
1839 optval = OPTBIT(IN6P_PKTINFO);
1842 case IPV6_RECVHOPLIMIT:
1843 optval = OPTBIT(IN6P_HOPLIMIT);
1846 case IPV6_RECVRTHDR:
1847 optval = OPTBIT(IN6P_RTHDR);
1850 case IPV6_RECVPATHMTU:
1851 optval = OPTBIT(IN6P_MTU);
1855 optval = OPTBIT(IN6P_IPV6_V6ONLY);
1858 case IPV6_PORTRANGE:
1861 flags = in6p->inp_flags;
1862 if (flags & INP_HIGHPORT)
1863 optval = IPV6_PORTRANGE_HIGH;
1864 else if (flags & INP_LOWPORT)
1865 optval = IPV6_PORTRANGE_LOW;
1870 case IPV6_RECVTCLASS:
1871 optval = OPTBIT(IN6P_TCLASS);
1874 case IPV6_AUTOFLOWLABEL:
1875 optval = OPTBIT(IN6P_AUTOFLOWLABEL);
1879 optval = OPTBIT(INP_BINDANY);
1883 optval = in6p->inp_flowid;
1887 optval = in6p->inp_flowtype;
1890 case IPV6_RSSBUCKETID:
1892 rss_hash2bucket(in6p->inp_flowid,
1896 optval = rss_bucket;
1902 case IPV6_BINDMULTI:
1903 optval = OPTBIT2(INP_BINDMULTI);
1909 error = sooptcopyout(sopt, &optval,
1916 struct ip6_mtuinfo mtuinfo;
1917 struct route_in6 sro;
1919 bzero(&sro, sizeof(sro));
1921 if (!(so->so_state & SS_ISCONNECTED))
1924 * XXX: we dot not consider the case of source
1925 * routing, or optional information to specify
1926 * the outgoing interface.
1928 error = ip6_getpmtu(&sro, NULL, NULL,
1929 &in6p->in6p_faddr, &pmtu, NULL,
1935 if (pmtu > IPV6_MAXPACKET)
1936 pmtu = IPV6_MAXPACKET;
1938 bzero(&mtuinfo, sizeof(mtuinfo));
1939 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
1940 optdata = (void *)&mtuinfo;
1941 optdatalen = sizeof(mtuinfo);
1942 error = sooptcopyout(sopt, optdata,
1947 case IPV6_2292PKTINFO:
1948 case IPV6_2292HOPLIMIT:
1949 case IPV6_2292HOPOPTS:
1950 case IPV6_2292RTHDR:
1951 case IPV6_2292DSTOPTS:
1953 case IPV6_2292PKTINFO:
1954 optval = OPTBIT(IN6P_PKTINFO);
1956 case IPV6_2292HOPLIMIT:
1957 optval = OPTBIT(IN6P_HOPLIMIT);
1959 case IPV6_2292HOPOPTS:
1960 optval = OPTBIT(IN6P_HOPOPTS);
1962 case IPV6_2292RTHDR:
1963 optval = OPTBIT(IN6P_RTHDR);
1965 case IPV6_2292DSTOPTS:
1966 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
1969 error = sooptcopyout(sopt, &optval,
1976 case IPV6_RTHDRDSTOPTS:
1980 case IPV6_USE_MIN_MTU:
1981 case IPV6_PREFER_TEMPADDR:
1982 error = ip6_getpcbopt(in6p->in6p_outputopts,
1986 case IPV6_MULTICAST_IF:
1987 case IPV6_MULTICAST_HOPS:
1988 case IPV6_MULTICAST_LOOP:
1990 error = ip6_getmoptions(in6p, sopt);
1994 case IPV6_IPSEC_POLICY:
1998 struct mbuf *m = NULL;
1999 struct mbuf **mp = &m;
2000 size_t ovalsize = sopt->sopt_valsize;
2001 caddr_t oval = (caddr_t)sopt->sopt_val;
2003 error = soopt_getm(sopt, &m); /* XXX */
2006 error = soopt_mcopyin(sopt, m); /* XXX */
2009 sopt->sopt_valsize = ovalsize;
2010 sopt->sopt_val = oval;
2012 req = mtod(m, caddr_t);
2015 error = ipsec_get_policy(in6p, req, len, mp);
2017 error = soopt_mcopyout(sopt, m); /* XXX */
2018 if (error == 0 && m)
2025 error = ENOPROTOOPT;
2035 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2037 int error = 0, optval, optlen;
2038 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2039 struct inpcb *in6p = sotoinpcb(so);
2040 int level, op, optname;
2042 level = sopt->sopt_level;
2043 op = sopt->sopt_dir;
2044 optname = sopt->sopt_name;
2045 optlen = sopt->sopt_valsize;
2047 if (level != IPPROTO_IPV6) {
2054 * For ICMPv6 sockets, no modification allowed for checksum
2055 * offset, permit "no change" values to help existing apps.
2057 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2058 * for an ICMPv6 socket will fail."
2059 * The current behavior does not meet RFC3542.
2063 if (optlen != sizeof(int)) {
2067 error = sooptcopyin(sopt, &optval, sizeof(optval),
2071 if ((optval % 2) != 0) {
2072 /* the API assumes even offset values */
2074 } else if (so->so_proto->pr_protocol ==
2076 if (optval != icmp6off)
2079 in6p->in6p_cksum = optval;
2083 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
2086 optval = in6p->in6p_cksum;
2088 error = sooptcopyout(sopt, &optval, sizeof(optval));
2098 error = ENOPROTOOPT;
2106 * Set up IP6 options in pcb for insertion in output packets or
2107 * specifying behavior of outgoing packets.
2110 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2111 struct socket *so, struct sockopt *sopt)
2113 struct ip6_pktopts *opt = *pktopt;
2115 struct thread *td = sopt->sopt_td;
2117 /* turn off any old options. */
2120 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2121 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2122 opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2123 printf("ip6_pcbopts: all specified options are cleared.\n");
2125 ip6_clearpktopts(opt, -1);
2127 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2130 if (!m || m->m_len == 0) {
2132 * Only turning off any previous options, regardless of
2133 * whether the opt is just created or given.
2135 free(opt, M_IP6OPT);
2139 /* set options specified by user. */
2140 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2141 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2142 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2143 free(opt, M_IP6OPT);
2151 * initialize ip6_pktopts. beware that there are non-zero default values in
2155 ip6_initpktopts(struct ip6_pktopts *opt)
2158 bzero(opt, sizeof(*opt));
2159 opt->ip6po_hlim = -1; /* -1 means default hop limit */
2160 opt->ip6po_tclass = -1; /* -1 means default traffic class */
2161 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2162 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2166 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2167 struct ucred *cred, int uproto)
2169 struct ip6_pktopts *opt;
2171 if (*pktopt == NULL) {
2172 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2174 ip6_initpktopts(*pktopt);
2178 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
2182 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt)
2184 void *optdata = NULL;
2186 struct ip6_ext *ip6e;
2188 struct in6_pktinfo null_pktinfo;
2189 int deftclass = 0, on;
2190 int defminmtu = IP6PO_MINMTU_MCASTONLY;
2191 int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2195 if (pktopt && pktopt->ip6po_pktinfo)
2196 optdata = (void *)pktopt->ip6po_pktinfo;
2198 /* XXX: we don't have to do this every time... */
2199 bzero(&null_pktinfo, sizeof(null_pktinfo));
2200 optdata = (void *)&null_pktinfo;
2202 optdatalen = sizeof(struct in6_pktinfo);
2205 if (pktopt && pktopt->ip6po_tclass >= 0)
2206 optdata = (void *)&pktopt->ip6po_tclass;
2208 optdata = (void *)&deftclass;
2209 optdatalen = sizeof(int);
2212 if (pktopt && pktopt->ip6po_hbh) {
2213 optdata = (void *)pktopt->ip6po_hbh;
2214 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
2215 optdatalen = (ip6e->ip6e_len + 1) << 3;
2219 if (pktopt && pktopt->ip6po_rthdr) {
2220 optdata = (void *)pktopt->ip6po_rthdr;
2221 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
2222 optdatalen = (ip6e->ip6e_len + 1) << 3;
2225 case IPV6_RTHDRDSTOPTS:
2226 if (pktopt && pktopt->ip6po_dest1) {
2227 optdata = (void *)pktopt->ip6po_dest1;
2228 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
2229 optdatalen = (ip6e->ip6e_len + 1) << 3;
2233 if (pktopt && pktopt->ip6po_dest2) {
2234 optdata = (void *)pktopt->ip6po_dest2;
2235 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
2236 optdatalen = (ip6e->ip6e_len + 1) << 3;
2240 if (pktopt && pktopt->ip6po_nexthop) {
2241 optdata = (void *)pktopt->ip6po_nexthop;
2242 optdatalen = pktopt->ip6po_nexthop->sa_len;
2245 case IPV6_USE_MIN_MTU:
2247 optdata = (void *)&pktopt->ip6po_minmtu;
2249 optdata = (void *)&defminmtu;
2250 optdatalen = sizeof(int);
2253 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2257 optdata = (void *)&on;
2258 optdatalen = sizeof(on);
2260 case IPV6_PREFER_TEMPADDR:
2262 optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
2264 optdata = (void *)&defpreftemp;
2265 optdatalen = sizeof(int);
2267 default: /* should not happen */
2269 panic("ip6_getpcbopt: unexpected option\n");
2271 return (ENOPROTOOPT);
2274 error = sooptcopyout(sopt, optdata, optdatalen);
2280 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2285 if (optname == -1 || optname == IPV6_PKTINFO) {
2286 if (pktopt->ip6po_pktinfo)
2287 free(pktopt->ip6po_pktinfo, M_IP6OPT);
2288 pktopt->ip6po_pktinfo = NULL;
2290 if (optname == -1 || optname == IPV6_HOPLIMIT)
2291 pktopt->ip6po_hlim = -1;
2292 if (optname == -1 || optname == IPV6_TCLASS)
2293 pktopt->ip6po_tclass = -1;
2294 if (optname == -1 || optname == IPV6_NEXTHOP) {
2295 if (pktopt->ip6po_nextroute.ro_rt) {
2296 RTFREE(pktopt->ip6po_nextroute.ro_rt);
2297 pktopt->ip6po_nextroute.ro_rt = NULL;
2299 if (pktopt->ip6po_nexthop)
2300 free(pktopt->ip6po_nexthop, M_IP6OPT);
2301 pktopt->ip6po_nexthop = NULL;
2303 if (optname == -1 || optname == IPV6_HOPOPTS) {
2304 if (pktopt->ip6po_hbh)
2305 free(pktopt->ip6po_hbh, M_IP6OPT);
2306 pktopt->ip6po_hbh = NULL;
2308 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2309 if (pktopt->ip6po_dest1)
2310 free(pktopt->ip6po_dest1, M_IP6OPT);
2311 pktopt->ip6po_dest1 = NULL;
2313 if (optname == -1 || optname == IPV6_RTHDR) {
2314 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2315 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2316 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2317 if (pktopt->ip6po_route.ro_rt) {
2318 RTFREE(pktopt->ip6po_route.ro_rt);
2319 pktopt->ip6po_route.ro_rt = NULL;
2322 if (optname == -1 || optname == IPV6_DSTOPTS) {
2323 if (pktopt->ip6po_dest2)
2324 free(pktopt->ip6po_dest2, M_IP6OPT);
2325 pktopt->ip6po_dest2 = NULL;
2329 #define PKTOPT_EXTHDRCPY(type) \
2332 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2333 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2334 if (dst->type == NULL && canwait == M_NOWAIT)\
2336 bcopy(src->type, dst->type, hlen);\
2338 } while (/*CONSTCOND*/ 0)
2341 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2343 if (dst == NULL || src == NULL) {
2344 printf("ip6_clearpktopts: invalid argument\n");
2348 dst->ip6po_hlim = src->ip6po_hlim;
2349 dst->ip6po_tclass = src->ip6po_tclass;
2350 dst->ip6po_flags = src->ip6po_flags;
2351 dst->ip6po_minmtu = src->ip6po_minmtu;
2352 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2353 if (src->ip6po_pktinfo) {
2354 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2356 if (dst->ip6po_pktinfo == NULL)
2358 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2360 if (src->ip6po_nexthop) {
2361 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2363 if (dst->ip6po_nexthop == NULL)
2365 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2366 src->ip6po_nexthop->sa_len);
2368 PKTOPT_EXTHDRCPY(ip6po_hbh);
2369 PKTOPT_EXTHDRCPY(ip6po_dest1);
2370 PKTOPT_EXTHDRCPY(ip6po_dest2);
2371 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2375 ip6_clearpktopts(dst, -1);
2378 #undef PKTOPT_EXTHDRCPY
2380 struct ip6_pktopts *
2381 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2384 struct ip6_pktopts *dst;
2386 dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2389 ip6_initpktopts(dst);
2391 if ((error = copypktopts(dst, src, canwait)) != 0) {
2392 free(dst, M_IP6OPT);
2400 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2405 ip6_clearpktopts(pktopt, -1);
2407 free(pktopt, M_IP6OPT);
2411 * Set IPv6 outgoing packet options based on advanced API.
2414 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2415 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2417 struct cmsghdr *cm = 0;
2419 if (control == NULL || opt == NULL)
2422 ip6_initpktopts(opt);
2427 * If stickyopt is provided, make a local copy of the options
2428 * for this particular packet, then override them by ancillary
2430 * XXX: copypktopts() does not copy the cached route to a next
2431 * hop (if any). This is not very good in terms of efficiency,
2432 * but we can allow this since this option should be rarely
2435 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2440 * XXX: Currently, we assume all the optional information is stored
2443 if (control->m_next)
2446 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2447 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2450 if (control->m_len < CMSG_LEN(0))
2453 cm = mtod(control, struct cmsghdr *);
2454 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2456 if (cm->cmsg_level != IPPROTO_IPV6)
2459 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2460 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2469 * Set a particular packet option, as a sticky option or an ancillary data
2470 * item. "len" can be 0 only when it's a sticky option.
2471 * We have 4 cases of combination of "sticky" and "cmsg":
2472 * "sticky=0, cmsg=0": impossible
2473 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2474 * "sticky=1, cmsg=0": RFC3542 socket option
2475 * "sticky=1, cmsg=1": RFC2292 socket option
2478 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2479 struct ucred *cred, int sticky, int cmsg, int uproto)
2481 int minmtupolicy, preftemp;
2484 if (!sticky && !cmsg) {
2486 printf("ip6_setpktopt: impossible case\n");
2492 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2493 * not be specified in the context of RFC3542. Conversely,
2494 * RFC3542 types should not be specified in the context of RFC2292.
2498 case IPV6_2292PKTINFO:
2499 case IPV6_2292HOPLIMIT:
2500 case IPV6_2292NEXTHOP:
2501 case IPV6_2292HOPOPTS:
2502 case IPV6_2292DSTOPTS:
2503 case IPV6_2292RTHDR:
2504 case IPV6_2292PKTOPTIONS:
2505 return (ENOPROTOOPT);
2508 if (sticky && cmsg) {
2515 case IPV6_RTHDRDSTOPTS:
2517 case IPV6_USE_MIN_MTU:
2520 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2521 return (ENOPROTOOPT);
2526 case IPV6_2292PKTINFO:
2529 struct ifnet *ifp = NULL;
2530 struct in6_pktinfo *pktinfo;
2532 if (len != sizeof(struct in6_pktinfo))
2535 pktinfo = (struct in6_pktinfo *)buf;
2538 * An application can clear any sticky IPV6_PKTINFO option by
2539 * doing a "regular" setsockopt with ipi6_addr being
2540 * in6addr_any and ipi6_ifindex being zero.
2541 * [RFC 3542, Section 6]
2543 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2544 pktinfo->ipi6_ifindex == 0 &&
2545 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2546 ip6_clearpktopts(opt, optname);
2550 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2551 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2554 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr))
2556 /* validate the interface index if specified. */
2557 if (pktinfo->ipi6_ifindex > V_if_index)
2559 if (pktinfo->ipi6_ifindex) {
2560 ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2564 if (ifp != NULL && (
2565 ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))
2569 !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2570 struct in6_ifaddr *ia;
2572 ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr);
2574 return (EADDRNOTAVAIL);
2575 ifa_free(&ia->ia_ifa);
2578 * We store the address anyway, and let in6_selectsrc()
2579 * validate the specified address. This is because ipi6_addr
2580 * may not have enough information about its scope zone, and
2581 * we may need additional information (such as outgoing
2582 * interface or the scope zone of a destination address) to
2583 * disambiguate the scope.
2584 * XXX: the delay of the validation may confuse the
2585 * application when it is used as a sticky option.
2587 if (opt->ip6po_pktinfo == NULL) {
2588 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2589 M_IP6OPT, M_NOWAIT);
2590 if (opt->ip6po_pktinfo == NULL)
2593 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2597 case IPV6_2292HOPLIMIT:
2603 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2604 * to simplify the ordering among hoplimit options.
2606 if (optname == IPV6_HOPLIMIT && sticky)
2607 return (ENOPROTOOPT);
2609 if (len != sizeof(int))
2612 if (*hlimp < -1 || *hlimp > 255)
2615 opt->ip6po_hlim = *hlimp;
2623 if (len != sizeof(int))
2625 tclass = *(int *)buf;
2626 if (tclass < -1 || tclass > 255)
2629 opt->ip6po_tclass = tclass;
2633 case IPV6_2292NEXTHOP:
2636 error = priv_check_cred(cred,
2637 PRIV_NETINET_SETHDROPTS, 0);
2642 if (len == 0) { /* just remove the option */
2643 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2647 /* check if cmsg_len is large enough for sa_len */
2648 if (len < sizeof(struct sockaddr) || len < *buf)
2651 switch (((struct sockaddr *)buf)->sa_family) {
2654 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
2657 if (sa6->sin6_len != sizeof(struct sockaddr_in6))
2660 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
2661 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
2664 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
2670 case AF_LINK: /* should eventually be supported */
2672 return (EAFNOSUPPORT);
2675 /* turn off the previous option, then set the new option. */
2676 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2677 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
2678 if (opt->ip6po_nexthop == NULL)
2680 bcopy(buf, opt->ip6po_nexthop, *buf);
2683 case IPV6_2292HOPOPTS:
2686 struct ip6_hbh *hbh;
2690 * XXX: We don't allow a non-privileged user to set ANY HbH
2691 * options, since per-option restriction has too much
2695 error = priv_check_cred(cred,
2696 PRIV_NETINET_SETHDROPTS, 0);
2702 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2703 break; /* just remove the option */
2706 /* message length validation */
2707 if (len < sizeof(struct ip6_hbh))
2709 hbh = (struct ip6_hbh *)buf;
2710 hbhlen = (hbh->ip6h_len + 1) << 3;
2714 /* turn off the previous option, then set the new option. */
2715 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2716 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
2717 if (opt->ip6po_hbh == NULL)
2719 bcopy(hbh, opt->ip6po_hbh, hbhlen);
2724 case IPV6_2292DSTOPTS:
2726 case IPV6_RTHDRDSTOPTS:
2728 struct ip6_dest *dest, **newdest = NULL;
2731 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
2732 error = priv_check_cred(cred,
2733 PRIV_NETINET_SETHDROPTS, 0);
2739 ip6_clearpktopts(opt, optname);
2740 break; /* just remove the option */
2743 /* message length validation */
2744 if (len < sizeof(struct ip6_dest))
2746 dest = (struct ip6_dest *)buf;
2747 destlen = (dest->ip6d_len + 1) << 3;
2752 * Determine the position that the destination options header
2753 * should be inserted; before or after the routing header.
2756 case IPV6_2292DSTOPTS:
2758 * The old advacned API is ambiguous on this point.
2759 * Our approach is to determine the position based
2760 * according to the existence of a routing header.
2761 * Note, however, that this depends on the order of the
2762 * extension headers in the ancillary data; the 1st
2763 * part of the destination options header must appear
2764 * before the routing header in the ancillary data,
2766 * RFC3542 solved the ambiguity by introducing
2767 * separate ancillary data or option types.
2769 if (opt->ip6po_rthdr == NULL)
2770 newdest = &opt->ip6po_dest1;
2772 newdest = &opt->ip6po_dest2;
2774 case IPV6_RTHDRDSTOPTS:
2775 newdest = &opt->ip6po_dest1;
2778 newdest = &opt->ip6po_dest2;
2782 /* turn off the previous option, then set the new option. */
2783 ip6_clearpktopts(opt, optname);
2784 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
2785 if (*newdest == NULL)
2787 bcopy(dest, *newdest, destlen);
2792 case IPV6_2292RTHDR:
2795 struct ip6_rthdr *rth;
2799 ip6_clearpktopts(opt, IPV6_RTHDR);
2800 break; /* just remove the option */
2803 /* message length validation */
2804 if (len < sizeof(struct ip6_rthdr))
2806 rth = (struct ip6_rthdr *)buf;
2807 rthlen = (rth->ip6r_len + 1) << 3;
2811 switch (rth->ip6r_type) {
2812 case IPV6_RTHDR_TYPE_0:
2813 if (rth->ip6r_len == 0) /* must contain one addr */
2815 if (rth->ip6r_len % 2) /* length must be even */
2817 if (rth->ip6r_len / 2 != rth->ip6r_segleft)
2821 return (EINVAL); /* not supported */
2824 /* turn off the previous option */
2825 ip6_clearpktopts(opt, IPV6_RTHDR);
2826 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
2827 if (opt->ip6po_rthdr == NULL)
2829 bcopy(rth, opt->ip6po_rthdr, rthlen);
2834 case IPV6_USE_MIN_MTU:
2835 if (len != sizeof(int))
2837 minmtupolicy = *(int *)buf;
2838 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
2839 minmtupolicy != IP6PO_MINMTU_DISABLE &&
2840 minmtupolicy != IP6PO_MINMTU_ALL) {
2843 opt->ip6po_minmtu = minmtupolicy;
2847 if (len != sizeof(int))
2850 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
2852 * we ignore this option for TCP sockets.
2853 * (RFC3542 leaves this case unspecified.)
2855 opt->ip6po_flags &= ~IP6PO_DONTFRAG;
2857 opt->ip6po_flags |= IP6PO_DONTFRAG;
2860 case IPV6_PREFER_TEMPADDR:
2861 if (len != sizeof(int))
2863 preftemp = *(int *)buf;
2864 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
2865 preftemp != IP6PO_TEMPADDR_NOTPREFER &&
2866 preftemp != IP6PO_TEMPADDR_PREFER) {
2869 opt->ip6po_prefer_tempaddr = preftemp;
2873 return (ENOPROTOOPT);
2874 } /* end of switch */
2880 * Routine called from ip6_output() to loop back a copy of an IP6 multicast
2881 * packet to the input queue of a specified interface. Note that this
2882 * calls the output routine of the loopback "driver", but with an interface
2883 * pointer that might NOT be &loif -- easier than replicating that code here.
2886 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst)
2889 struct ip6_hdr *ip6;
2891 copym = m_copy(m, 0, M_COPYALL);
2896 * Make sure to deep-copy IPv6 header portion in case the data
2897 * is in an mbuf cluster, so that we can safely override the IPv6
2898 * header portion later.
2900 if (!M_WRITABLE(copym) ||
2901 copym->m_len < sizeof(struct ip6_hdr)) {
2902 copym = m_pullup(copym, sizeof(struct ip6_hdr));
2908 if (copym->m_len < sizeof(*ip6)) {
2914 ip6 = mtod(copym, struct ip6_hdr *);
2916 * clear embedded scope identifiers if necessary.
2917 * in6_clearscope will touch the addresses only when necessary.
2919 in6_clearscope(&ip6->ip6_src);
2920 in6_clearscope(&ip6->ip6_dst);
2922 (void)if_simloop(ifp, copym, dst->sin6_family, 0);
2926 * Chop IPv6 header off from the payload.
2929 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
2932 struct ip6_hdr *ip6;
2934 ip6 = mtod(m, struct ip6_hdr *);
2935 if (m->m_len > sizeof(*ip6)) {
2936 mh = m_gethdr(M_NOWAIT, MT_DATA);
2941 m_move_pkthdr(mh, m);
2942 MH_ALIGN(mh, sizeof(*ip6));
2943 m->m_len -= sizeof(*ip6);
2944 m->m_data += sizeof(*ip6);
2947 m->m_len = sizeof(*ip6);
2948 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
2950 exthdrs->ip6e_ip6 = m;
2955 * Compute IPv6 extension header length.
2958 ip6_optlen(struct inpcb *in6p)
2962 if (!in6p->in6p_outputopts)
2967 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
2969 len += elen(in6p->in6p_outputopts->ip6po_hbh);
2970 if (in6p->in6p_outputopts->ip6po_rthdr)
2971 /* dest1 is valid with rthdr only */
2972 len += elen(in6p->in6p_outputopts->ip6po_dest1);
2973 len += elen(in6p->in6p_outputopts->ip6po_rthdr);
2974 len += elen(in6p->in6p_outputopts->ip6po_dest2);