1 /* $FreeBSD: src/sys/netinet6/ip6_output.c,v 1.13.2.18 2003/01/24 05:11:35 sam Exp $ */
2 /* $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ */
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61 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
64 #include "opt_ip6fw.h"
66 #include "opt_inet6.h"
67 #include "opt_ipsec.h"
69 #include <sys/param.h>
70 #include <sys/malloc.h>
72 #include <sys/errno.h>
73 #include <sys/protosw.h>
74 #include <sys/socket.h>
75 #include <sys/socketvar.h>
76 #include <sys/systm.h>
77 #include <sys/kernel.h>
81 #include <sys/thread2.h>
82 #include <sys/msgport2.h>
85 #include <net/route.h>
88 #include <netinet/in.h>
89 #include <netinet/in_var.h>
90 #include <netinet6/in6_var.h>
91 #include <netinet/ip6.h>
92 #include <netinet/icmp6.h>
93 #include <netinet6/ip6_var.h>
94 #include <netinet/in_pcb.h>
95 #include <netinet6/nd6.h>
96 #include <netinet6/ip6protosw.h>
99 #include <netinet6/ipsec.h>
101 #include <netinet6/ipsec6.h>
103 #include <netproto/key/key.h>
107 #include <netproto/ipsec/ipsec.h>
108 #include <netproto/ipsec/ipsec6.h>
109 #include <netproto/ipsec/key.h>
112 #include <net/ip6fw/ip6_fw.h>
114 #include <net/net_osdep.h>
116 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options");
119 struct mbuf *ip6e_ip6;
120 struct mbuf *ip6e_hbh;
121 struct mbuf *ip6e_dest1;
122 struct mbuf *ip6e_rthdr;
123 struct mbuf *ip6e_dest2;
126 static int ip6_pcbopt (int, u_char *, int, struct ip6_pktopts **, int);
127 static int ip6_setpktoption (int, u_char *, int, struct ip6_pktopts *,
129 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, struct socket *,
131 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *);
132 static int ip6_setmoptions (int, struct ip6_moptions **, struct mbuf *);
133 static int ip6_getmoptions (int, struct ip6_moptions *, struct mbuf **);
134 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *,
135 struct ifnet *, struct in6_addr *, u_long *, int *);
136 static int copyexthdr (void *, struct mbuf **);
137 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
139 static int ip6_insert_jumboopt (struct ip6_exthdrs *, u_int32_t);
140 static struct mbuf *ip6_splithdr (struct mbuf *);
141 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
144 * IP6 output. The packet in mbuf chain m contains a skeletal IP6
145 * header (with pri, len, nxt, hlim, src, dst).
146 * This function may modify ver and hlim only.
147 * The mbuf chain containing the packet will be freed.
148 * The mbuf opt, if present, will not be freed.
150 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and
151 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one,
152 * which is rt_rmx.rmx_mtu.
155 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, struct route_in6 *ro,
156 int flags, struct ip6_moptions *im6o,
157 struct ifnet **ifpp, /* XXX: just for statistics */
160 struct ip6_hdr *ip6, *mhip6;
161 struct ifnet *ifp, *origifp;
165 int hlen, tlen, len, off;
166 struct route_in6 ip6route;
167 struct sockaddr_in6 *dst;
169 struct in6_ifaddr *ia = NULL;
171 int alwaysfrag, dontfrag;
172 u_int32_t optlen, plen = 0, unfragpartlen;
173 struct ip6_exthdrs exthdrs;
174 struct in6_addr finaldst;
175 struct route_in6 *ro_pmtu = NULL;
176 boolean_t hdrsplit = FALSE;
177 boolean_t needipsec = FALSE;
179 boolean_t needipsectun = FALSE;
180 struct secpolicy *sp = NULL;
181 struct socket *so = inp ? inp->inp_socket : NULL;
183 ip6 = mtod(m, struct ip6_hdr *);
186 boolean_t needipsectun = FALSE;
187 struct secpolicy *sp = NULL;
189 ip6 = mtod(m, struct ip6_hdr *);
192 bzero(&exthdrs, sizeof exthdrs);
195 if ((error = copyexthdr(opt->ip6po_hbh, &exthdrs.ip6e_hbh)))
197 if ((error = copyexthdr(opt->ip6po_dest1, &exthdrs.ip6e_dest1)))
199 if ((error = copyexthdr(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr)))
201 if ((error = copyexthdr(opt->ip6po_dest2, &exthdrs.ip6e_dest2)))
206 /* get a security policy for this packet */
208 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error);
210 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error);
213 ipsec6stat.out_inval++;
220 switch (sp->policy) {
221 case IPSEC_POLICY_DISCARD:
223 * This packet is just discarded.
225 ipsec6stat.out_polvio++;
228 case IPSEC_POLICY_BYPASS:
229 case IPSEC_POLICY_NONE:
230 /* no need to do IPsec. */
234 case IPSEC_POLICY_IPSEC:
235 if (sp->req == NULL) {
236 error = key_spdacquire(sp); /* acquire a policy */
242 case IPSEC_POLICY_ENTRUST:
244 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy);
248 /* get a security policy for this packet */
250 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error);
252 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error);
255 newipsecstat.ips_out_inval++;
262 switch (sp->policy) {
263 case IPSEC_POLICY_DISCARD:
265 * This packet is just discarded.
267 newipsecstat.ips_out_polvio++;
270 case IPSEC_POLICY_BYPASS:
271 case IPSEC_POLICY_NONE:
272 /* no need to do IPsec. */
276 case IPSEC_POLICY_IPSEC:
277 if (sp->req == NULL) {
278 error = key_spdacquire(sp); /* acquire a policy */
284 case IPSEC_POLICY_ENTRUST:
286 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy);
288 #endif /* FAST_IPSEC */
291 * Calculate the total length of the extension header chain.
292 * Keep the length of the unfragmentable part for fragmentation.
294 optlen = m_lengthm(exthdrs.ip6e_hbh, NULL) +
295 m_lengthm(exthdrs.ip6e_dest1, NULL) +
296 m_lengthm(exthdrs.ip6e_rthdr, NULL);
298 unfragpartlen = optlen + sizeof(struct ip6_hdr);
300 /* NOTE: we don't add AH/ESP length here. do that later. */
301 optlen += m_lengthm(exthdrs.ip6e_dest2, NULL);
304 * If we need IPsec, or there is at least one extension header,
305 * separate IP6 header from the payload.
307 if ((needipsec || optlen) && !hdrsplit) {
308 exthdrs.ip6e_ip6 = ip6_splithdr(m);
309 if (exthdrs.ip6e_ip6 == NULL) {
313 m = exthdrs.ip6e_ip6;
318 ip6 = mtod(m, struct ip6_hdr *);
320 /* adjust mbuf packet header length */
321 m->m_pkthdr.len += optlen;
322 plen = m->m_pkthdr.len - sizeof(*ip6);
324 /* If this is a jumbo payload, insert a jumbo payload option. */
325 if (plen > IPV6_MAXPACKET) {
327 exthdrs.ip6e_ip6 = ip6_splithdr(m);
328 if (exthdrs.ip6e_ip6 == NULL) {
332 m = exthdrs.ip6e_ip6;
336 ip6 = mtod(m, struct ip6_hdr *);
337 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
341 ip6->ip6_plen = htons(plen);
344 * Concatenate headers and fill in next header fields.
345 * Here we have, on "m"
347 * and we insert headers accordingly. Finally, we should be getting:
348 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
350 * during the header composing process, "m" points to IPv6 header.
351 * "mprev" points to an extension header prior to esp.
354 nexthdrp = &ip6->ip6_nxt;
358 * we treat dest2 specially. this makes IPsec processing
359 * much easier. the goal here is to make mprev point the
360 * mbuf prior to dest2.
362 * result: IPv6 dest2 payload
363 * m and mprev will point to IPv6 header.
365 if (exthdrs.ip6e_dest2) {
367 panic("assumption failed: hdr not split");
368 exthdrs.ip6e_dest2->m_next = m->m_next;
369 m->m_next = exthdrs.ip6e_dest2;
370 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
371 ip6->ip6_nxt = IPPROTO_DSTOPTS;
375 * Place m1 after mprev.
377 #define MAKE_CHAIN(m1, mprev, nexthdrp, i)\
381 panic("assumption failed: hdr not split");\
382 *mtod(m1, u_char *) = *nexthdrp;\
384 nexthdrp = mtod(m1, u_char *);\
385 m1->m_next = mprev->m_next;\
392 * result: IPv6 hbh dest1 rthdr dest2 payload
393 * m will point to IPv6 header. mprev will point to the
394 * extension header prior to dest2 (rthdr in the above case).
396 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
397 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, IPPROTO_DSTOPTS);
398 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, IPPROTO_ROUTING);
400 #if defined(IPSEC) || defined(FAST_IPSEC)
402 struct ipsec_output_state state;
404 struct ip6_rthdr *rh = NULL;
407 * pointers after IPsec headers are not valid any more.
408 * other pointers need a great care too.
409 * (IPsec routines should not mangle mbufs prior to AH/ESP)
411 exthdrs.ip6e_dest2 = NULL;
413 if (exthdrs.ip6e_rthdr) {
414 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *);
415 segleft_org = rh->ip6r_segleft;
416 rh->ip6r_segleft = 0;
419 bzero(&state, sizeof state);
421 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags,
425 /* mbuf is already reclaimed in ipsec6_output_trans. */
435 kprintf("ip6_output (ipsec): error code %d\n",
439 /* don't show these error codes to the user */
445 if (exthdrs.ip6e_rthdr) {
446 /* ah6_output doesn't modify mbuf chain */
447 rh->ip6r_segleft = segleft_org;
453 * If there is a routing header, replace the destination address field
454 * with the first hop of the routing header.
456 if (exthdrs.ip6e_rthdr) {
457 struct ip6_rthdr *rh;
459 finaldst = ip6->ip6_dst;
460 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *);
461 switch (rh->ip6r_type) {
462 default: /* is it possible? */
468 /* Source address validation */
469 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
470 !(flags & IPV6_DADOUTPUT)) {
472 ip6stat.ip6s_badscope++;
475 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
477 ip6stat.ip6s_badscope++;
481 ip6stat.ip6s_localout++;
488 bzero(ro, sizeof(*ro));
491 if (opt && opt->ip6po_rthdr)
492 ro = &opt->ip6po_route;
493 dst = (struct sockaddr_in6 *)&ro->ro_dst;
496 * If there is a cached route,
497 * check that it is to the same destination
498 * and is still up. If not, free it and try again.
500 if (ro->ro_rt != NULL &&
501 (!(ro->ro_rt->rt_flags & RTF_UP) || dst->sin6_family != AF_INET6 ||
502 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) {
506 if (ro->ro_rt == NULL) {
507 bzero(dst, sizeof(*dst));
508 dst->sin6_family = AF_INET6;
509 dst->sin6_len = sizeof(struct sockaddr_in6);
510 dst->sin6_addr = ip6->ip6_dst;
512 #if defined(IPSEC) || defined(FAST_IPSEC)
513 if (needipsec && needipsectun) {
514 struct ipsec_output_state state;
517 * All the extension headers will become inaccessible
518 * (since they can be encrypted).
519 * Don't panic, we need no more updates to extension headers
520 * on inner IPv6 packet (since they are now encapsulated).
522 * IPv6 [ESP|AH] IPv6 [extension headers] payload
524 bzero(&exthdrs, sizeof(exthdrs));
525 exthdrs.ip6e_ip6 = m;
527 bzero(&state, sizeof(state));
529 state.ro = (struct route *)ro;
530 state.dst = (struct sockaddr *)dst;
532 error = ipsec6_output_tunnel(&state, sp, flags);
535 ro = (struct route_in6 *)state.ro;
536 dst = (struct sockaddr_in6 *)state.dst;
538 /* mbuf is already reclaimed in ipsec6_output_tunnel. */
549 kprintf("ip6_output (ipsec): error code %d\n", error);
552 /* don't show these error codes to the user */
559 exthdrs.ip6e_ip6 = m;
563 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
566 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
567 #define sin6tosa(sin6) ((struct sockaddr *)(sin6))
569 * interface selection comes here
570 * if an interface is specified from an upper layer,
573 if (ro->ro_rt == NULL) {
575 * non-bsdi always clone routes, if parent is
578 rtalloc((struct route *)ro);
580 if (ro->ro_rt == NULL) {
581 ip6stat.ip6s_noroute++;
582 error = EHOSTUNREACH;
583 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */
586 ia = ifatoia6(ro->ro_rt->rt_ifa);
587 ifp = ro->ro_rt->rt_ifp;
589 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
590 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway;
591 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
593 in6_ifstat_inc(ifp, ifs6_out_request);
596 * Check if the outgoing interface conflicts with
597 * the interface specified by ifi6_ifindex (if specified).
598 * Note that loopback interface is always okay.
599 * (this may happen when we are sending a packet to one of
600 * our own addresses.)
602 if (opt && opt->ip6po_pktinfo
603 && opt->ip6po_pktinfo->ipi6_ifindex) {
604 if (!(ifp->if_flags & IFF_LOOPBACK)
605 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) {
606 ip6stat.ip6s_noroute++;
607 in6_ifstat_inc(ifp, ifs6_out_discard);
608 error = EHOSTUNREACH;
613 if (opt && opt->ip6po_hlim != -1)
614 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
617 struct in6_multi *in6m;
619 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
622 * See if the caller provided any multicast options
626 ip6->ip6_hlim = im6o->im6o_multicast_hlim;
627 if (im6o->im6o_multicast_ifp != NULL)
628 ifp = im6o->im6o_multicast_ifp;
630 ip6->ip6_hlim = ip6_defmcasthlim;
633 * See if the caller provided the outgoing interface
634 * as an ancillary data.
635 * Boundary check for ifindex is assumed to be already done.
637 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex)
638 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex];
641 * If the destination is a node-local scope multicast,
642 * the packet should be loop-backed only.
644 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
646 * If the outgoing interface is already specified,
647 * it should be a loopback interface.
649 if (ifp && !(ifp->if_flags & IFF_LOOPBACK)) {
650 ip6stat.ip6s_badscope++;
651 error = ENETUNREACH; /* XXX: better error? */
652 /* XXX correct ifp? */
653 in6_ifstat_inc(ifp, ifs6_out_discard);
660 if (opt && opt->ip6po_hlim != -1)
661 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
664 * If caller did not provide an interface lookup a
665 * default in the routing table. This is either a
666 * default for the speicfied group (i.e. a host
667 * route), or a multicast default (a route for the
671 if (ro->ro_rt == NULL) {
673 rtpurelookup((struct sockaddr *)&ro->ro_dst);
675 if (ro->ro_rt == NULL) {
676 ip6stat.ip6s_noroute++;
677 error = EHOSTUNREACH;
678 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */
681 ia = ifatoia6(ro->ro_rt->rt_ifa);
682 ifp = ro->ro_rt->rt_ifp;
686 if (!(flags & IPV6_FORWARDING))
687 in6_ifstat_inc(ifp, ifs6_out_request);
688 in6_ifstat_inc(ifp, ifs6_out_mcast);
691 * Confirm that the outgoing interface supports multicast.
693 if (!(ifp->if_flags & IFF_MULTICAST)) {
694 ip6stat.ip6s_noroute++;
695 in6_ifstat_inc(ifp, ifs6_out_discard);
699 in6m = IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp);
701 (im6o == NULL || im6o->im6o_multicast_loop)) {
703 * If we belong to the destination multicast group
704 * on the outgoing interface, and the caller did not
705 * forbid loopback, loop back a copy.
707 ip6_mloopback(ifp, m, dst);
710 * If we are acting as a multicast router, perform
711 * multicast forwarding as if the packet had just
712 * arrived on the interface to which we are about
713 * to send. The multicast forwarding function
714 * recursively calls this function, using the
715 * IPV6_FORWARDING flag to prevent infinite recursion.
717 * Multicasts that are looped back by ip6_mloopback(),
718 * above, will be forwarded by the ip6_input() routine,
721 if (ip6_mrouter && !(flags & IPV6_FORWARDING)) {
722 if (ip6_mforward(ip6, ifp, m) != 0) {
729 * Multicasts with a hoplimit of zero may be looped back,
730 * above, but must not be transmitted on a network.
731 * Also, multicasts addressed to the loopback interface
732 * are not sent -- the above call to ip6_mloopback() will
733 * loop back a copy if this host actually belongs to the
734 * destination group on the loopback interface.
736 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) {
743 * Fill the outgoing inteface to tell the upper layer
744 * to increment per-interface statistics.
749 /* Determine path MTU. */
750 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu,
755 * The caller of this function may specify to use the minimum MTU
757 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
758 * setting. The logic is a bit complicated; by default, unicast
759 * packets will follow path MTU while multicast packets will be sent at
760 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
761 * including unicast ones will be sent at the minimum MTU. Multicast
762 * packets will always be sent at the minimum MTU unless
763 * IP6PO_MINMTU_DISABLE is explicitly specified.
764 * See RFC 3542 for more details.
766 if (mtu > IPV6_MMTU) {
767 if ((flags & IPV6_MINMTU))
769 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
771 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
773 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
778 /* Fake scoped addresses */
779 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
781 * If source or destination address is a scoped address, and
782 * the packet is going to be sent to a loopback interface,
783 * we should keep the original interface.
787 * XXX: this is a very experimental and temporary solution.
788 * We eventually have sockaddr_in6 and use the sin6_scope_id
789 * field of the structure here.
790 * We rely on the consistency between two scope zone ids
791 * of source and destination, which should already be assured.
792 * Larger scopes than link will be supported in the future.
795 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
796 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])];
797 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
798 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])];
800 * XXX: origifp can be NULL even in those two cases above.
801 * For example, if we remove the (only) link-local address
802 * from the loopback interface, and try to send a link-local
803 * address without link-id information. Then the source
804 * address is ::1, and the destination address is the
805 * link-local address with its s6_addr16[1] being zero.
806 * What is worse, if the packet goes to the loopback interface
807 * by a default rejected route, the null pointer would be
808 * passed to looutput, and the kernel would hang.
809 * The following last resort would prevent such disaster.
817 * clear embedded scope identifiers if necessary.
818 * in6_clearscope will touch the addresses only when necessary.
820 in6_clearscope(&ip6->ip6_src);
821 in6_clearscope(&ip6->ip6_dst);
824 * Check with the firewall...
826 if (ip6_fw_enable && ip6_fw_chk_ptr) {
829 m->m_pkthdr.rcvif = NULL; /* XXX */
830 /* If ipfw says divert, we have to just drop packet */
831 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) {
842 * If the outgoing packet contains a hop-by-hop options header,
843 * it must be examined and processed even by the source node.
844 * (RFC 2460, section 4.)
846 if (exthdrs.ip6e_hbh) {
847 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
848 u_int32_t dummy1; /* XXX unused */
849 u_int32_t dummy2; /* XXX unused */
852 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
853 panic("ip6e_hbh is not continuous");
856 * XXX: if we have to send an ICMPv6 error to the sender,
857 * we need the M_LOOP flag since icmp6_error() expects
858 * the IPv6 and the hop-by-hop options header are
859 * continuous unless the flag is set.
861 m->m_flags |= M_LOOP;
862 m->m_pkthdr.rcvif = ifp;
863 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
864 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
865 &dummy1, &dummy2) < 0) {
866 /* m was already freed at this point */
867 error = EINVAL;/* better error? */
870 m->m_flags &= ~M_LOOP; /* XXX */
871 m->m_pkthdr.rcvif = NULL;
875 * Run through list of hooks for output packets.
877 if (pfil_has_hooks(&inet6_pfil_hook)) {
878 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT);
879 if (error != 0 || m == NULL)
881 ip6 = mtod(m, struct ip6_hdr *);
885 * Send the packet to the outgoing interface.
886 * If necessary, do IPv6 fragmentation before sending.
888 * the logic here is rather complex:
889 * 1: normal case (dontfrag == 0, alwaysfrag == 0)
890 * 1-a: send as is if tlen <= path mtu
891 * 1-b: fragment if tlen > path mtu
893 * 2: if user asks us not to fragment (dontfrag == 1)
894 * 2-a: send as is if tlen <= interface mtu
895 * 2-b: error if tlen > interface mtu
897 * 3: if we always need to attach fragment header (alwaysfrag == 1)
900 * 4: if dontfrag == 1 && alwaysfrag == 1
901 * error, as we cannot handle this conflicting request
903 tlen = m->m_pkthdr.len;
905 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG))
909 if (dontfrag && alwaysfrag) { /* case 4 */
910 /* conflicting request - can't transmit */
914 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */
916 * Even if the DONTFRAG option is specified, we cannot send the
917 * packet when the data length is larger than the MTU of the
918 * outgoing interface.
919 * Notify the error by sending IPV6_PATHMTU ancillary data as
920 * well as returning an error code (the latter is not described
924 struct ip6ctlparam ip6cp;
926 mtu32 = (u_int32_t)mtu;
927 bzero(&ip6cp, sizeof(ip6cp));
928 ip6cp.ip6c_cmdarg = (void *)&mtu32;
929 kpfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
937 * transmit packet without fragmentation
939 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
940 struct in6_ifaddr *ia6;
942 ip6 = mtod(m, struct ip6_hdr *);
943 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
945 /* Record statistics for this interface address. */
946 IFA_STAT_INC(&ia6->ia_ifa, opackets, 1);
947 IFA_STAT_INC(&ia6->ia_ifa, obytes, m->m_pkthdr.len);
950 /* clean ipsec history once it goes out of the node */
953 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
958 * try to fragment the packet. case 1-b and 3
960 if (mtu < IPV6_MMTU) {
962 * note that path MTU is never less than IPV6_MMTU
966 in6_ifstat_inc(ifp, ifs6_out_fragfail);
968 } else if (ip6->ip6_plen == 0) {
969 /* jumbo payload cannot be fragmented */
971 in6_ifstat_inc(ifp, ifs6_out_fragfail);
974 struct mbuf **mnext, *m_frgpart;
975 struct ip6_frag *ip6f;
976 u_int32_t id = htonl(ip6_id++);
980 * Too large for the destination or interface;
981 * fragment if possible.
982 * Must be able to put at least 8 bytes per fragment.
984 hlen = unfragpartlen;
985 if (mtu > IPV6_MAXPACKET)
986 mtu = IPV6_MAXPACKET;
988 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
991 in6_ifstat_inc(ifp, ifs6_out_fragfail);
995 mnext = &m->m_nextpkt;
998 * Change the next header field of the last header in the
999 * unfragmentable part.
1001 if (exthdrs.ip6e_rthdr) {
1002 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
1003 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
1004 } else if (exthdrs.ip6e_dest1) {
1005 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
1006 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
1007 } else if (exthdrs.ip6e_hbh) {
1008 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
1009 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
1011 nextproto = ip6->ip6_nxt;
1012 ip6->ip6_nxt = IPPROTO_FRAGMENT;
1016 * Loop through length of segment after first fragment,
1017 * make new header and copy data of each part and link onto
1021 for (off = hlen; off < tlen; off += len) {
1022 MGETHDR(m, M_NOWAIT, MT_HEADER);
1025 ip6stat.ip6s_odropped++;
1028 m->m_pkthdr.rcvif = NULL;
1029 m->m_flags = m0->m_flags & M_COPYFLAGS;
1031 mnext = &m->m_nextpkt;
1032 m->m_data += max_linkhdr;
1033 mhip6 = mtod(m, struct ip6_hdr *);
1035 m->m_len = sizeof(*mhip6);
1036 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
1038 ip6stat.ip6s_odropped++;
1041 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
1042 if (off + len >= tlen)
1045 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
1046 mhip6->ip6_plen = htons((u_short)(len + hlen +
1047 sizeof(*ip6f) - sizeof(struct ip6_hdr)));
1048 if ((m_frgpart = m_copy(m0, off, len)) == NULL) {
1050 ip6stat.ip6s_odropped++;
1053 m_cat(m, m_frgpart);
1054 m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
1055 m->m_pkthdr.rcvif = NULL;
1056 ip6f->ip6f_reserved = 0;
1057 ip6f->ip6f_ident = id;
1058 ip6f->ip6f_nxt = nextproto;
1059 ip6stat.ip6s_ofragments++;
1060 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
1063 in6_ifstat_inc(ifp, ifs6_out_fragok);
1067 * Remove leading garbages.
1071 m0->m_nextpkt = NULL;
1073 for (m0 = m; m; m = m0) {
1075 m->m_nextpkt = NULL;
1077 /* Record statistics for this interface address. */
1079 IFA_STAT_INC(&ia->ia_ifa, opackets, 1);
1080 IFA_STAT_INC(&ia->ia_ifa, obytes,
1084 /* clean ipsec history once it goes out of the node */
1087 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
1093 ip6stat.ip6s_fragmented++;
1096 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */
1098 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) {
1099 RTFREE(ro_pmtu->ro_rt);
1114 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */
1115 m_freem(exthdrs.ip6e_dest1);
1116 m_freem(exthdrs.ip6e_rthdr);
1117 m_freem(exthdrs.ip6e_dest2);
1125 copyexthdr(void *h, struct mbuf **mp)
1127 struct ip6_ext *hdr = h;
1134 hlen = (hdr->ip6e_len + 1) * 8;
1135 if (hlen > MCLBYTES)
1136 return ENOBUFS; /* XXX */
1138 m = m_getb(hlen, M_NOWAIT, MT_DATA, 0);
1143 bcopy(hdr, mtod(m, caddr_t), hlen);
1150 * Insert jumbo payload option.
1153 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1159 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */
1162 * If there is no hop-by-hop options header, allocate new one.
1163 * If there is one but it doesn't have enough space to store the
1164 * jumbo payload option, allocate a cluster to store the whole options.
1165 * Otherwise, use it to store the options.
1167 if (exthdrs->ip6e_hbh == NULL) {
1168 MGET(mopt, M_NOWAIT, MT_DATA);
1171 mopt->m_len = JUMBOOPTLEN;
1172 optbuf = mtod(mopt, u_char *);
1173 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */
1174 exthdrs->ip6e_hbh = mopt;
1176 struct ip6_hbh *hbh;
1178 mopt = exthdrs->ip6e_hbh;
1179 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1182 * - exthdrs->ip6e_hbh is not referenced from places
1183 * other than exthdrs.
1184 * - exthdrs->ip6e_hbh is not an mbuf chain.
1186 int oldoptlen = mopt->m_len;
1190 * XXX: give up if the whole (new) hbh header does
1191 * not fit even in an mbuf cluster.
1193 if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1197 * As a consequence, we must always prepare a cluster
1200 n = m_getcl(M_NOWAIT, MT_DATA, 0);
1203 n->m_len = oldoptlen + JUMBOOPTLEN;
1204 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), oldoptlen);
1205 optbuf = mtod(n, caddr_t) + oldoptlen;
1207 mopt = exthdrs->ip6e_hbh = n;
1209 optbuf = mtod(mopt, u_char *) + mopt->m_len;
1210 mopt->m_len += JUMBOOPTLEN;
1212 optbuf[0] = IP6OPT_PADN;
1216 * Adjust the header length according to the pad and
1217 * the jumbo payload option.
1219 hbh = mtod(mopt, struct ip6_hbh *);
1220 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1223 /* fill in the option. */
1224 optbuf[2] = IP6OPT_JUMBO;
1226 v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1227 bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1229 /* finally, adjust the packet header length */
1230 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1237 * Insert fragment header and copy unfragmentable header portions.
1240 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1241 struct ip6_frag **frghdrp)
1243 struct mbuf *n, *mlast;
1245 if (hlen > sizeof(struct ip6_hdr)) {
1246 n = m_copym(m0, sizeof(struct ip6_hdr),
1247 hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1254 /* Search for the last mbuf of unfragmentable part. */
1255 for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1258 if (!(mlast->m_flags & M_EXT) &&
1259 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1260 /* use the trailing space of the last mbuf for the fragment hdr */
1261 *frghdrp = (struct ip6_frag *)
1262 (mtod(mlast, caddr_t) + mlast->m_len);
1263 mlast->m_len += sizeof(struct ip6_frag);
1264 m->m_pkthdr.len += sizeof(struct ip6_frag);
1266 /* allocate a new mbuf for the fragment header */
1269 MGET(mfrg, M_NOWAIT, MT_DATA);
1272 mfrg->m_len = sizeof(struct ip6_frag);
1273 *frghdrp = mtod(mfrg, struct ip6_frag *);
1274 mlast->m_next = mfrg;
1281 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro,
1282 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup,
1289 if (ro_pmtu != ro) {
1290 /* The first hop and the final destination may differ. */
1291 struct sockaddr_in6 *sa6_dst =
1292 (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1293 if (ro_pmtu->ro_rt &&
1294 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 ||
1295 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) {
1296 RTFREE(ro_pmtu->ro_rt);
1297 ro_pmtu->ro_rt = NULL;
1299 if (ro_pmtu->ro_rt == NULL) {
1300 bzero(sa6_dst, sizeof(*sa6_dst));
1301 sa6_dst->sin6_family = AF_INET6;
1302 sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1303 sa6_dst->sin6_addr = *dst;
1305 rtalloc((struct route *)ro_pmtu);
1308 if (ro_pmtu->ro_rt) {
1312 ifp = ro_pmtu->ro_rt->rt_ifp;
1313 ifmtu = IN6_LINKMTU(ifp);
1314 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu;
1317 } else if (mtu < IPV6_MMTU) {
1319 * RFC2460 section 5, last paragraph:
1320 * if we record ICMPv6 too big message with
1321 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1322 * or smaller, with framgent header attached.
1323 * (fragment header is needed regardless from the
1324 * packet size, for translators to identify packets)
1328 } else if (mtu > ifmtu) {
1330 * The MTU on the route is larger than the MTU on
1331 * the interface! This shouldn't happen, unless the
1332 * MTU of the interface has been changed after the
1333 * interface was brought up. Change the MTU in the
1334 * route to match the interface MTU (as long as the
1335 * field isn't locked).
1338 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu;
1341 mtu = IN6_LINKMTU(ifp);
1343 error = EHOSTUNREACH; /* XXX */
1348 *alwaysfragp = alwaysfrag;
1353 * IP6 socket option processing.
1356 ip6_ctloutput_dispatch(netmsg_t msg)
1360 error = ip6_ctloutput(msg->ctloutput.base.nm_so,
1361 msg->ctloutput.nm_sopt);
1362 lwkt_replymsg(&msg->ctloutput.base.lmsg, error);
1366 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1368 int optdatalen,uproto;
1370 struct inpcb *in6p = so->so_pcb;
1373 int level, op, optname;
1378 level = sopt->sopt_level;
1379 op = sopt->sopt_dir;
1380 optname = sopt->sopt_name;
1381 optlen = sopt->sopt_valsize;
1384 panic("ip6_ctloutput: arg soopt is NULL");
1390 uproto = (int)so->so_proto->pr_protocol;
1391 privileged = (td == NULL || priv_check(td, PRIV_ROOT)) ? 0 : 1;
1393 if (level == IPPROTO_IPV6) {
1398 case IPV6_2292PKTOPTIONS:
1399 #ifdef IPV6_PKTOPTIONS
1400 case IPV6_PKTOPTIONS:
1405 error = soopt_getm(sopt, &m); /* XXX */
1408 soopt_to_mbuf(sopt, m); /* XXX */
1409 error = ip6_pcbopts(&in6p->in6p_outputopts,
1411 m_freem(m); /* XXX */
1416 * Use of some Hop-by-Hop options or some
1417 * Destination options, might require special
1418 * privilege. That is, normal applications
1419 * (without special privilege) might be forbidden
1420 * from setting certain options in outgoing packets,
1421 * and might never see certain options in received
1422 * packets. [RFC 2292 Section 6]
1423 * KAME specific note:
1424 * KAME prevents non-privileged users from sending or
1425 * receiving ANY hbh/dst options in order to avoid
1426 * overhead of parsing options in the kernel.
1428 case IPV6_RECVHOPOPTS:
1429 case IPV6_RECVDSTOPTS:
1430 case IPV6_RECVRTHDRDSTOPTS:
1433 case IPV6_RECVPKTINFO:
1434 case IPV6_RECVHOPLIMIT:
1435 case IPV6_RECVRTHDR:
1436 case IPV6_RECVPATHMTU:
1437 case IPV6_RECVTCLASS:
1438 case IPV6_AUTOFLOWLABEL:
1441 case IPV6_UNICAST_HOPS:
1445 if (optlen != sizeof(int)) {
1449 error = soopt_to_kbuf(sopt, &optval,
1450 sizeof optval, sizeof optval);
1455 case IPV6_UNICAST_HOPS:
1456 if (optval < -1 || optval >= 256)
1459 /* -1 = kernel default */
1460 in6p->in6p_hops = optval;
1463 #define OPTSET(bit) \
1466 in6p->in6p_flags |= (bit); \
1468 in6p->in6p_flags &= ~(bit); \
1470 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0)
1472 * Although changed to RFC3542, It's better to also support RFC2292 API
1474 #define OPTSET2292(bit) \
1476 in6p->in6p_flags |= IN6P_RFC2292; \
1478 in6p->in6p_flags |= (bit); \
1480 in6p->in6p_flags &= ~(bit); \
1481 } while (/*CONSTCOND*/ 0)
1483 case IPV6_RECVPKTINFO:
1484 /* cannot mix with RFC2292 */
1485 if (OPTBIT(IN6P_RFC2292)) {
1489 OPTSET(IN6P_PKTINFO);
1494 struct ip6_pktopts **optp;
1496 /* cannot mix with RFC2292 */
1497 if (OPTBIT(IN6P_RFC2292)) {
1501 optp = &in6p->in6p_outputopts;
1502 error = ip6_pcbopt(IPV6_HOPLIMIT,
1503 (u_char *)&optval, sizeof(optval),
1508 case IPV6_RECVHOPLIMIT:
1509 /* cannot mix with RFC2292 */
1510 if (OPTBIT(IN6P_RFC2292)) {
1514 OPTSET(IN6P_HOPLIMIT);
1517 case IPV6_RECVHOPOPTS:
1518 /* cannot mix with RFC2292 */
1519 if (OPTBIT(IN6P_RFC2292)) {
1523 OPTSET(IN6P_HOPOPTS);
1526 case IPV6_RECVDSTOPTS:
1527 /* cannot mix with RFC2292 */
1528 if (OPTBIT(IN6P_RFC2292)) {
1532 OPTSET(IN6P_DSTOPTS);
1535 case IPV6_RECVRTHDRDSTOPTS:
1536 /* cannot mix with RFC2292 */
1537 if (OPTBIT(IN6P_RFC2292)) {
1541 OPTSET(IN6P_RTHDRDSTOPTS);
1544 case IPV6_RECVRTHDR:
1545 /* cannot mix with RFC2292 */
1546 if (OPTBIT(IN6P_RFC2292)) {
1553 case IPV6_RECVPATHMTU:
1555 * We ignore this option for TCP
1557 * (RFC3542 leaves this case
1560 if (uproto != IPPROTO_TCP)
1564 case IPV6_RECVTCLASS:
1565 /* cannot mix with RFC2292 XXX */
1566 if (OPTBIT(IN6P_RFC2292)) {
1570 OPTSET(IN6P_TCLASS);
1573 case IPV6_AUTOFLOWLABEL:
1574 OPTSET(IN6P_AUTOFLOWLABEL);
1583 * make setsockopt(IPV6_V6ONLY)
1584 * available only prior to bind(2).
1586 if (in6p->in6p_lport ||
1587 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr))
1593 /* Don't allow v4-mapped */
1602 case IPV6_USE_MIN_MTU:
1603 case IPV6_PREFER_TEMPADDR:
1604 if (optlen != sizeof(optval)) {
1608 error = soopt_to_kbuf(sopt, &optval,
1609 sizeof optval, sizeof optval);
1613 struct ip6_pktopts **optp;
1614 optp = &in6p->in6p_outputopts;
1615 error = ip6_pcbopt(optname,
1616 (u_char *)&optval, sizeof(optval),
1621 case IPV6_2292PKTINFO:
1622 case IPV6_2292HOPLIMIT:
1623 case IPV6_2292HOPOPTS:
1624 case IPV6_2292DSTOPTS:
1625 case IPV6_2292RTHDR:
1627 if (optlen != sizeof(int)) {
1631 error = soopt_to_kbuf(sopt, &optval,
1632 sizeof optval, sizeof optval);
1636 case IPV6_2292PKTINFO:
1637 OPTSET2292(IN6P_PKTINFO);
1639 case IPV6_2292HOPLIMIT:
1640 OPTSET2292(IN6P_HOPLIMIT);
1642 case IPV6_2292HOPOPTS:
1644 * Check super-user privilege.
1645 * See comments for IPV6_RECVHOPOPTS.
1649 OPTSET2292(IN6P_HOPOPTS);
1651 case IPV6_2292DSTOPTS:
1654 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1656 case IPV6_2292RTHDR:
1657 OPTSET2292(IN6P_RTHDR);
1666 case IPV6_RTHDRDSTOPTS:
1670 * New advanced API (RFC3542)
1673 u_char optbuf_storage[MCLBYTES];
1675 struct ip6_pktopts **optp;
1677 /* cannot mix with RFC2292 */
1678 if (OPTBIT(IN6P_RFC2292)) {
1684 * We only ensure valsize is not too large
1685 * here. Further validation will be done
1688 error = soopt_to_kbuf(sopt, optbuf_storage,
1689 sizeof(optbuf_storage), 0);
1692 optlen = sopt->sopt_valsize;
1693 optbuf = optbuf_storage;
1694 optp = &in6p->in6p_outputopts;
1695 error = ip6_pcbopt(optname, optbuf, optlen,
1701 case IPV6_MULTICAST_IF:
1702 case IPV6_MULTICAST_HOPS:
1703 case IPV6_MULTICAST_LOOP:
1704 case IPV6_JOIN_GROUP:
1705 case IPV6_LEAVE_GROUP:
1709 if (sopt->sopt_valsize > MLEN) {
1714 MGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_HEADER);
1719 m->m_len = sopt->sopt_valsize;
1720 error = soopt_to_kbuf(sopt, mtod(m, char *),
1721 m->m_len, m->m_len);
1722 error = ip6_setmoptions(sopt->sopt_name,
1723 &in6p->in6p_moptions,
1729 case IPV6_PORTRANGE:
1730 error = soopt_to_kbuf(sopt, &optval,
1731 sizeof optval, sizeof optval);
1736 case IPV6_PORTRANGE_DEFAULT:
1737 in6p->in6p_flags &= ~(IN6P_LOWPORT);
1738 in6p->in6p_flags &= ~(IN6P_HIGHPORT);
1741 case IPV6_PORTRANGE_HIGH:
1742 in6p->in6p_flags &= ~(IN6P_LOWPORT);
1743 in6p->in6p_flags |= IN6P_HIGHPORT;
1746 case IPV6_PORTRANGE_LOW:
1747 in6p->in6p_flags &= ~(IN6P_HIGHPORT);
1748 in6p->in6p_flags |= IN6P_LOWPORT;
1757 #if defined(IPSEC) || defined(FAST_IPSEC)
1758 case IPV6_IPSEC_POLICY:
1764 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1766 soopt_to_mbuf(sopt, m); /* XXX */
1768 req = mtod(m, caddr_t);
1771 error = ipsec6_set_policy(in6p, optname, req,
1776 #endif /* KAME IPSEC */
1784 struct mbuf **mp = &m;
1786 if (ip6_fw_ctl_ptr == NULL)
1789 if ((error = soopt_getm(sopt, &m)) != 0)
1792 soopt_to_mbuf(sopt, m);
1793 error = (*ip6_fw_ctl_ptr)(optname, mp);
1799 error = ENOPROTOOPT;
1806 case IPV6_2292PKTOPTIONS:
1807 #ifdef IPV6_PKTOPTIONS
1808 case IPV6_PKTOPTIONS:
1811 * RFC3542 (effectively) deprecated the
1812 * semantics of the 2292-style pktoptions.
1813 * Since it was not reliable in nature (i.e.,
1814 * applications had to expect the lack of some
1815 * information after all), it would make sense
1816 * to simplify this part by always returning
1819 if (in6p->in6p_options) {
1821 m = m_copym(in6p->in6p_options,
1822 0, M_COPYALL, M_WAITOK);
1823 error = soopt_from_mbuf(sopt, m);
1827 sopt->sopt_valsize = 0;
1830 case IPV6_RECVHOPOPTS:
1831 case IPV6_RECVDSTOPTS:
1832 case IPV6_RECVRTHDRDSTOPTS:
1833 case IPV6_UNICAST_HOPS:
1834 case IPV6_RECVPKTINFO:
1835 case IPV6_RECVHOPLIMIT:
1836 case IPV6_RECVRTHDR:
1837 case IPV6_RECVPATHMTU:
1838 case IPV6_RECVTCLASS:
1839 case IPV6_AUTOFLOWLABEL:
1842 case IPV6_PORTRANGE:
1845 case IPV6_RECVHOPOPTS:
1846 optval = OPTBIT(IN6P_HOPOPTS);
1849 case IPV6_RECVDSTOPTS:
1850 optval = OPTBIT(IN6P_DSTOPTS);
1853 case IPV6_RECVRTHDRDSTOPTS:
1854 optval = OPTBIT(IN6P_RTHDRDSTOPTS);
1857 case IPV6_RECVPKTINFO:
1858 optval = OPTBIT(IN6P_PKTINFO);
1861 case IPV6_RECVHOPLIMIT:
1862 optval = OPTBIT(IN6P_HOPLIMIT);
1865 case IPV6_RECVRTHDR:
1866 optval = OPTBIT(IN6P_RTHDR);
1869 case IPV6_RECVPATHMTU:
1870 optval = OPTBIT(IN6P_MTU);
1873 case IPV6_RECVTCLASS:
1874 optval = OPTBIT(IN6P_TCLASS);
1877 case IPV6_AUTOFLOWLABEL:
1878 optval = OPTBIT(IN6P_AUTOFLOWLABEL);
1882 case IPV6_UNICAST_HOPS:
1883 optval = in6p->in6p_hops;
1887 optval = OPTBIT(IN6P_FAITH);
1894 case IPV6_PORTRANGE:
1897 flags = in6p->in6p_flags;
1898 if (flags & IN6P_HIGHPORT)
1899 optval = IPV6_PORTRANGE_HIGH;
1900 else if (flags & IN6P_LOWPORT)
1901 optval = IPV6_PORTRANGE_LOW;
1907 soopt_from_kbuf(sopt, &optval,
1914 struct ip6_mtuinfo mtuinfo;
1915 struct route_in6 sro;
1917 bzero(&sro, sizeof(sro));
1919 if (!(so->so_state & SS_ISCONNECTED))
1922 * XXX: we dot not consider the case of source
1923 * routing, or optional information to specify
1924 * the outgoing interface.
1926 error = ip6_getpmtu(&sro, NULL, NULL,
1927 &in6p->in6p_faddr, &pmtu, NULL);
1932 if (pmtu > IPV6_MAXPACKET)
1933 pmtu = IPV6_MAXPACKET;
1935 bzero(&mtuinfo, sizeof(mtuinfo));
1936 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
1937 optdata = (void *)&mtuinfo;
1938 optdatalen = sizeof(mtuinfo);
1939 soopt_from_kbuf(sopt, optdata,
1944 case IPV6_2292PKTINFO:
1945 case IPV6_2292HOPLIMIT:
1946 case IPV6_2292HOPOPTS:
1947 case IPV6_2292RTHDR:
1948 case IPV6_2292DSTOPTS:
1949 if (optname == IPV6_2292HOPOPTS ||
1950 optname == IPV6_2292DSTOPTS ||
1954 case IPV6_2292PKTINFO:
1955 optval = OPTBIT(IN6P_PKTINFO);
1957 case IPV6_2292HOPLIMIT:
1958 optval = OPTBIT(IN6P_HOPLIMIT);
1960 case IPV6_2292HOPOPTS:
1963 optval = OPTBIT(IN6P_HOPOPTS);
1965 case IPV6_2292RTHDR:
1966 optval = OPTBIT(IN6P_RTHDR);
1968 case IPV6_2292DSTOPTS:
1971 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
1974 soopt_from_kbuf(sopt, &optval,
1982 case IPV6_RTHDRDSTOPTS:
1986 case IPV6_USE_MIN_MTU:
1987 case IPV6_PREFER_TEMPADDR:
1988 error = ip6_getpcbopt(in6p->in6p_outputopts,
1992 case IPV6_MULTICAST_IF:
1993 case IPV6_MULTICAST_HOPS:
1994 case IPV6_MULTICAST_LOOP:
1995 case IPV6_JOIN_GROUP:
1996 case IPV6_LEAVE_GROUP:
1999 error = ip6_getmoptions(sopt->sopt_name,
2000 in6p->in6p_moptions, &m);
2002 soopt_from_kbuf(sopt,
2003 mtod(m, char *), m->m_len);
2009 #if defined(IPSEC) || defined(FAST_IPSEC)
2010 case IPV6_IPSEC_POLICY:
2014 struct mbuf *m = NULL;
2015 struct mbuf **mp = &m;
2017 error = soopt_getm(sopt, &m); /* XXX */
2020 soopt_to_mbuf(sopt, m); /* XXX */
2022 req = mtod(m, caddr_t);
2025 error = ipsec6_get_policy(in6p, req, len, mp);
2027 error = soopt_from_mbuf(sopt, m);/*XXX*/
2028 if (error == 0 && m != NULL)
2032 #endif /* KAME IPSEC */
2037 struct mbuf **mp = &m;
2039 if (ip6_fw_ctl_ptr == NULL)
2043 error = (*ip6_fw_ctl_ptr)(optname, mp);
2045 error = soopt_from_mbuf(sopt, m); /* XXX */
2046 if (error == 0 && m != NULL)
2052 error = ENOPROTOOPT;
2064 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2066 int error = 0, optval, optlen;
2067 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2068 struct in6pcb *in6p = sotoin6pcb(so);
2069 int level, op, optname;
2072 level = sopt->sopt_level;
2073 op = sopt->sopt_dir;
2074 optname = sopt->sopt_name;
2075 optlen = sopt->sopt_valsize;
2077 panic("ip6_raw_ctloutput: arg soopt is NULL");
2079 if (level != IPPROTO_IPV6) {
2086 * For ICMPv6 sockets, no modification allowed for checksum
2087 * offset, permit "no change" values to help existing apps.
2089 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2090 * for an ICMPv6 socket will fail."
2091 * The current behavior does not meet RFC3542.
2095 if (optlen != sizeof(int)) {
2099 error = soopt_to_kbuf(sopt, &optval,
2100 sizeof optval, sizeof optval);
2103 if ((optval % 2) != 0) {
2104 /* the API assumes even offset values */
2106 } else if (so->so_proto->pr_protocol ==
2108 if (optval != icmp6off)
2111 in6p->in6p_cksum = optval;
2115 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
2118 optval = in6p->in6p_cksum;
2120 soopt_from_kbuf(sopt, &optval, sizeof(optval));
2130 error = ENOPROTOOPT;
2138 * Set up IP6 options in pcb for insertion in output packets or
2139 * specifying behavior of outgoing packets.
2142 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2143 struct socket *so, struct sockopt *sopt)
2146 struct ip6_pktopts *opt = *pktopt;
2149 /* turn off any old options. */
2152 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2153 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2154 opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2155 kprintf("ip6_pcbopts: all specified options are cleared.\n");
2157 ip6_clearpktopts(opt, -1);
2159 opt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2162 if (!m || m->m_len == 0) {
2164 * Only turning off any previous options, regardless of
2165 * whether the opt is just created or given.
2167 kfree(opt, M_IP6OPT);
2171 /* set options specified by user. */
2172 if ((error = ip6_setpktoptions(m, opt, NULL, so->so_proto->pr_protocol, priv)) != 0) {
2173 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2174 kfree(opt, M_IP6OPT);
2183 * Below three functions are introduced by merge to RFC3542
2187 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt)
2189 void *optdata = NULL;
2191 struct ip6_ext *ip6e;
2193 struct in6_pktinfo null_pktinfo;
2194 int deftclass = 0, on;
2195 int defminmtu = IP6PO_MINMTU_MCASTONLY;
2196 int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2200 if (pktopt && pktopt->ip6po_pktinfo)
2201 optdata = (void *)pktopt->ip6po_pktinfo;
2203 /* XXX: we don't have to do this every time... */
2204 bzero(&null_pktinfo, sizeof(null_pktinfo));
2205 optdata = (void *)&null_pktinfo;
2207 optdatalen = sizeof(struct in6_pktinfo);
2210 if (pktopt && pktopt->ip6po_tclass >= 0)
2211 optdata = (void *)&pktopt->ip6po_tclass;
2213 optdata = (void *)&deftclass;
2214 optdatalen = sizeof(int);
2217 if (pktopt && pktopt->ip6po_hbh) {
2218 optdata = (void *)pktopt->ip6po_hbh;
2219 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
2220 optdatalen = (ip6e->ip6e_len + 1) << 3;
2224 if (pktopt && pktopt->ip6po_rthdr) {
2225 optdata = (void *)pktopt->ip6po_rthdr;
2226 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
2227 optdatalen = (ip6e->ip6e_len + 1) << 3;
2230 case IPV6_RTHDRDSTOPTS:
2231 if (pktopt && pktopt->ip6po_dest1) {
2232 optdata = (void *)pktopt->ip6po_dest1;
2233 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
2234 optdatalen = (ip6e->ip6e_len + 1) << 3;
2238 if (pktopt && pktopt->ip6po_dest2) {
2239 optdata = (void *)pktopt->ip6po_dest2;
2240 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
2241 optdatalen = (ip6e->ip6e_len + 1) << 3;
2245 if (pktopt && pktopt->ip6po_nexthop) {
2246 optdata = (void *)pktopt->ip6po_nexthop;
2247 optdatalen = pktopt->ip6po_nexthop->sa_len;
2250 case IPV6_USE_MIN_MTU:
2252 optdata = (void *)&pktopt->ip6po_minmtu;
2254 optdata = (void *)&defminmtu;
2255 optdatalen = sizeof(int);
2258 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2262 optdata = (void *)&on;
2263 optdatalen = sizeof(on);
2265 case IPV6_PREFER_TEMPADDR:
2267 optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
2269 optdata = (void *)&defpreftemp;
2270 optdatalen = sizeof(int);
2272 default: /* should not happen */
2274 panic("ip6_getpcbopt: unexpected option");
2276 return (ENOPROTOOPT);
2279 soopt_from_kbuf(sopt, optdata, optdatalen);
2285 * initialize ip6_pktopts. beware that there are non-zero default values in
2290 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, int uproto)
2292 struct ip6_pktopts *opt;
2294 if (*pktopt == NULL) {
2295 *pktopt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2296 init_ip6pktopts(*pktopt);
2300 return (ip6_setpktoption(optname, buf, len, opt, 1, 0, uproto, priv));
2304 * initialize ip6_pktopts. beware that there are non-zero default values in
2308 init_ip6pktopts(struct ip6_pktopts *opt)
2311 bzero(opt, sizeof(*opt));
2312 opt->ip6po_hlim = -1; /* -1 means default hop limit */
2313 opt->ip6po_tclass = -1; /* -1 means default traffic class */
2314 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2315 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2319 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2324 if (optname == -1 || optname == IPV6_PKTINFO) {
2325 if (pktopt->ip6po_pktinfo)
2326 kfree(pktopt->ip6po_pktinfo, M_IP6OPT);
2327 pktopt->ip6po_pktinfo = NULL;
2329 if (optname == -1 || optname == IPV6_HOPLIMIT)
2330 pktopt->ip6po_hlim = -1;
2331 if (optname == -1 || optname == IPV6_TCLASS)
2332 pktopt->ip6po_tclass = -1;
2333 if (optname == -1 || optname == IPV6_NEXTHOP) {
2334 if (pktopt->ip6po_nextroute.ro_rt) {
2335 RTFREE(pktopt->ip6po_nextroute.ro_rt);
2336 pktopt->ip6po_nextroute.ro_rt = NULL;
2338 if (pktopt->ip6po_nexthop)
2339 kfree(pktopt->ip6po_nexthop, M_IP6OPT);
2340 pktopt->ip6po_nexthop = NULL;
2342 if (optname == -1 || optname == IPV6_HOPOPTS) {
2343 if (pktopt->ip6po_hbh)
2344 kfree(pktopt->ip6po_hbh, M_IP6OPT);
2345 pktopt->ip6po_hbh = NULL;
2347 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2348 if (pktopt->ip6po_dest1)
2349 kfree(pktopt->ip6po_dest1, M_IP6OPT);
2350 pktopt->ip6po_dest1 = NULL;
2352 if (optname == -1 || optname == IPV6_RTHDR) {
2353 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2354 kfree(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2355 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2356 if (pktopt->ip6po_route.ro_rt) {
2357 RTFREE(pktopt->ip6po_route.ro_rt);
2358 pktopt->ip6po_route.ro_rt = NULL;
2361 if (optname == -1 || optname == IPV6_DSTOPTS) {
2362 if (pktopt->ip6po_dest2)
2363 kfree(pktopt->ip6po_dest2, M_IP6OPT);
2364 pktopt->ip6po_dest2 = NULL;
2368 #define PKTOPT_EXTHDRCPY(type) \
2371 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2372 dst->type = kmalloc(hlen, M_IP6OPT, canwait);\
2373 if (dst->type == NULL)\
2375 bcopy(src->type, dst->type, hlen);\
2379 struct ip6_pktopts *
2380 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2382 struct ip6_pktopts *dst;
2385 kprintf("ip6_clearpktopts: invalid argument\n");
2389 dst = kmalloc(sizeof(*dst), M_IP6OPT, canwait | M_ZERO);
2393 dst->ip6po_hlim = src->ip6po_hlim;
2394 if (src->ip6po_pktinfo) {
2395 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo),
2397 if (dst->ip6po_pktinfo == NULL)
2399 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2401 if (src->ip6po_nexthop) {
2402 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len,
2404 if (dst->ip6po_nexthop == NULL)
2406 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2407 src->ip6po_nexthop->sa_len);
2409 PKTOPT_EXTHDRCPY(ip6po_hbh);
2410 PKTOPT_EXTHDRCPY(ip6po_dest1);
2411 PKTOPT_EXTHDRCPY(ip6po_dest2);
2412 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2416 if (dst->ip6po_pktinfo) kfree(dst->ip6po_pktinfo, M_IP6OPT);
2417 if (dst->ip6po_nexthop) kfree(dst->ip6po_nexthop, M_IP6OPT);
2418 if (dst->ip6po_hbh) kfree(dst->ip6po_hbh, M_IP6OPT);
2419 if (dst->ip6po_dest1) kfree(dst->ip6po_dest1, M_IP6OPT);
2420 if (dst->ip6po_dest2) kfree(dst->ip6po_dest2, M_IP6OPT);
2421 if (dst->ip6po_rthdr) kfree(dst->ip6po_rthdr, M_IP6OPT);
2422 kfree(dst, M_IP6OPT);
2427 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2429 if (dst == NULL || src == NULL) {
2431 kprintf("ip6_clearpktopts: invalid argument\n");
2436 dst->ip6po_hlim = src->ip6po_hlim;
2437 dst->ip6po_tclass = src->ip6po_tclass;
2438 dst->ip6po_flags = src->ip6po_flags;
2439 if (src->ip6po_pktinfo) {
2440 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo),
2442 if (dst->ip6po_pktinfo == NULL)
2444 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2446 if (src->ip6po_nexthop) {
2447 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len,
2449 if (dst->ip6po_nexthop == NULL)
2451 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2452 src->ip6po_nexthop->sa_len);
2454 PKTOPT_EXTHDRCPY(ip6po_hbh);
2455 PKTOPT_EXTHDRCPY(ip6po_dest1);
2456 PKTOPT_EXTHDRCPY(ip6po_dest2);
2457 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2461 ip6_clearpktopts(dst, -1);
2464 #undef PKTOPT_EXTHDRCPY
2467 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2472 ip6_clearpktopts(pktopt, -1);
2474 kfree(pktopt, M_IP6OPT);
2478 * Set the IP6 multicast options in response to user setsockopt().
2481 ip6_setmoptions(int optname, struct ip6_moptions **im6op, struct mbuf *m)
2484 u_int loop, ifindex;
2485 struct ipv6_mreq *mreq;
2487 struct ip6_moptions *im6o = *im6op;
2488 struct route_in6 ro;
2489 struct sockaddr_in6 *dst;
2490 struct in6_multi_mship *imm;
2491 struct thread *td = curthread;
2495 * No multicast option buffer attached to the pcb;
2496 * allocate one and initialize to default values.
2498 im6o = (struct ip6_moptions *)
2499 kmalloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK);
2502 im6o->im6o_multicast_ifp = NULL;
2503 im6o->im6o_multicast_hlim = ip6_defmcasthlim;
2504 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP;
2505 LIST_INIT(&im6o->im6o_memberships);
2510 case IPV6_MULTICAST_IF:
2512 * Select the interface for outgoing multicast packets.
2514 if (m == NULL || m->m_len != sizeof(u_int)) {
2518 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex));
2519 if (ifindex < 0 || if_index < ifindex) {
2520 error = ENXIO; /* XXX EINVAL? */
2523 ifp = ifindex2ifnet[ifindex];
2524 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) {
2525 error = EADDRNOTAVAIL;
2528 im6o->im6o_multicast_ifp = ifp;
2531 case IPV6_MULTICAST_HOPS:
2534 * Set the IP6 hoplimit for outgoing multicast packets.
2537 if (m == NULL || m->m_len != sizeof(int)) {
2541 bcopy(mtod(m, u_int *), &optval, sizeof(optval));
2542 if (optval < -1 || optval >= 256)
2544 else if (optval == -1)
2545 im6o->im6o_multicast_hlim = ip6_defmcasthlim;
2547 im6o->im6o_multicast_hlim = optval;
2551 case IPV6_MULTICAST_LOOP:
2553 * Set the loopback flag for outgoing multicast packets.
2554 * Must be zero or one.
2556 if (m == NULL || m->m_len != sizeof(u_int)) {
2560 bcopy(mtod(m, u_int *), &loop, sizeof(loop));
2565 im6o->im6o_multicast_loop = loop;
2568 case IPV6_JOIN_GROUP:
2570 * Add a multicast group membership.
2571 * Group must be a valid IP6 multicast address.
2573 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) {
2577 mreq = mtod(m, struct ipv6_mreq *);
2578 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) {
2580 * We use the unspecified address to specify to accept
2581 * all multicast addresses. Only super user is allowed
2584 if (priv_check(td, PRIV_ROOT)) {
2588 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) {
2594 * If the interface is specified, validate it.
2596 if (mreq->ipv6mr_interface < 0
2597 || if_index < mreq->ipv6mr_interface) {
2598 error = ENXIO; /* XXX EINVAL? */
2602 * If no interface was explicitly specified, choose an
2603 * appropriate one according to the given multicast address.
2605 if (mreq->ipv6mr_interface == 0) {
2607 * If the multicast address is in node-local scope,
2608 * the interface should be a loopback interface.
2609 * Otherwise, look up the routing table for the
2610 * address, and choose the outgoing interface.
2611 * XXX: is it a good approach?
2613 if (IN6_IS_ADDR_MC_INTFACELOCAL(&mreq->ipv6mr_multiaddr)) {
2617 dst = (struct sockaddr_in6 *)&ro.ro_dst;
2618 bzero(dst, sizeof(*dst));
2619 dst->sin6_len = sizeof(struct sockaddr_in6);
2620 dst->sin6_family = AF_INET6;
2621 dst->sin6_addr = mreq->ipv6mr_multiaddr;
2622 rtalloc((struct route *)&ro);
2623 if (ro.ro_rt == NULL) {
2624 error = EADDRNOTAVAIL;
2627 ifp = ro.ro_rt->rt_ifp;
2631 ifp = ifindex2ifnet[mreq->ipv6mr_interface];
2634 * See if we found an interface, and confirm that it
2635 * supports multicast
2637 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) {
2638 error = EADDRNOTAVAIL;
2642 * Put interface index into the multicast address,
2643 * if the address has link-local scope.
2645 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) {
2646 mreq->ipv6mr_multiaddr.s6_addr16[1]
2647 = htons(mreq->ipv6mr_interface);
2650 * See if the membership already exists.
2652 for (imm = im6o->im6o_memberships.lh_first;
2653 imm != NULL; imm = imm->i6mm_chain.le_next)
2654 if (imm->i6mm_maddr->in6m_ifp == ifp &&
2655 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
2656 &mreq->ipv6mr_multiaddr))
2663 * Everything looks good; add a new record to the multicast
2664 * address list for the given interface.
2666 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_WAITOK);
2667 if ((imm->i6mm_maddr =
2668 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) {
2669 kfree(imm, M_IPMADDR);
2672 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
2675 case IPV6_LEAVE_GROUP:
2677 * Drop a multicast group membership.
2678 * Group must be a valid IP6 multicast address.
2680 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) {
2684 mreq = mtod(m, struct ipv6_mreq *);
2685 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) {
2686 if (priv_check(td, PRIV_ROOT)) {
2690 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) {
2695 * If an interface address was specified, get a pointer
2696 * to its ifnet structure.
2698 if (mreq->ipv6mr_interface < 0
2699 || if_index < mreq->ipv6mr_interface) {
2700 error = ENXIO; /* XXX EINVAL? */
2703 ifp = ifindex2ifnet[mreq->ipv6mr_interface];
2705 * Put interface index into the multicast address,
2706 * if the address has link-local scope.
2708 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) {
2709 mreq->ipv6mr_multiaddr.s6_addr16[1]
2710 = htons(mreq->ipv6mr_interface);
2714 * Find the membership in the membership list.
2716 for (imm = im6o->im6o_memberships.lh_first;
2717 imm != NULL; imm = imm->i6mm_chain.le_next) {
2718 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) &&
2719 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
2720 &mreq->ipv6mr_multiaddr))
2724 /* Unable to resolve interface */
2725 error = EADDRNOTAVAIL;
2729 * Give up the multicast address record to which the
2730 * membership points.
2732 LIST_REMOVE(imm, i6mm_chain);
2733 in6_delmulti(imm->i6mm_maddr);
2734 kfree(imm, M_IPMADDR);
2743 * If all options have default values, no need to keep the mbuf.
2745 if (im6o->im6o_multicast_ifp == NULL &&
2746 im6o->im6o_multicast_hlim == ip6_defmcasthlim &&
2747 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP &&
2748 im6o->im6o_memberships.lh_first == NULL) {
2749 kfree(*im6op, M_IPMOPTS);
2757 * Return the IP6 multicast options in response to user getsockopt().
2760 ip6_getmoptions(int optname, struct ip6_moptions *im6o, struct mbuf **mp)
2762 u_int *hlim, *loop, *ifindex;
2764 *mp = m_get(M_WAITOK, MT_HEADER); /* XXX */
2768 case IPV6_MULTICAST_IF:
2769 ifindex = mtod(*mp, u_int *);
2770 (*mp)->m_len = sizeof(u_int);
2771 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL)
2774 *ifindex = im6o->im6o_multicast_ifp->if_index;
2777 case IPV6_MULTICAST_HOPS:
2778 hlim = mtod(*mp, u_int *);
2779 (*mp)->m_len = sizeof(u_int);
2781 *hlim = ip6_defmcasthlim;
2783 *hlim = im6o->im6o_multicast_hlim;
2786 case IPV6_MULTICAST_LOOP:
2787 loop = mtod(*mp, u_int *);
2788 (*mp)->m_len = sizeof(u_int);
2790 *loop = ip6_defmcasthlim;
2792 *loop = im6o->im6o_multicast_loop;
2796 return (EOPNOTSUPP);
2801 * Discard the IP6 multicast options.
2804 ip6_freemoptions(struct ip6_moptions *im6o)
2806 struct in6_multi_mship *imm;
2811 while ((imm = im6o->im6o_memberships.lh_first) != NULL) {
2812 LIST_REMOVE(imm, i6mm_chain);
2813 if (imm->i6mm_maddr)
2814 in6_delmulti(imm->i6mm_maddr);
2815 kfree(imm, M_IPMADDR);
2817 kfree(im6o, M_IPMOPTS);
2821 * Set a particular packet option, as a sticky option or an ancillary data
2822 * item. "len" can be 0 only when it's a sticky option.
2823 * We have 4 cases of combination of "sticky" and "cmsg":
2824 * "sticky=0, cmsg=0": impossible
2825 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2826 * "sticky=1, cmsg=0": RFC3542 socket option
2827 * "sticky=1, cmsg=1": RFC2292 socket option
2830 ip6_setpktoption(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2831 int sticky, int cmsg, int uproto, int priv)
2833 int minmtupolicy, preftemp;
2836 if (!sticky && !cmsg) {
2837 kprintf("ip6_setpktoption: impossible case\n");
2842 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2843 * not be specified in the context of RFC3542. Conversely,
2844 * RFC3542 types should not be specified in the context of RFC2292.
2848 case IPV6_2292PKTINFO:
2849 case IPV6_2292HOPLIMIT:
2850 case IPV6_2292NEXTHOP:
2851 case IPV6_2292HOPOPTS:
2852 case IPV6_2292DSTOPTS:
2853 case IPV6_2292RTHDR:
2854 case IPV6_2292PKTOPTIONS:
2855 return (ENOPROTOOPT);
2858 if (sticky && cmsg) {
2865 case IPV6_RTHDRDSTOPTS:
2867 case IPV6_USE_MIN_MTU:
2870 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2871 return (ENOPROTOOPT);
2876 case IPV6_2292PKTINFO:
2879 struct in6_pktinfo *pktinfo;
2880 if (len != sizeof(struct in6_pktinfo))
2882 pktinfo = (struct in6_pktinfo *)buf;
2885 * An application can clear any sticky IPV6_PKTINFO option by
2886 * doing a "regular" setsockopt with ipi6_addr being
2887 * in6addr_any and ipi6_ifindex being zero.
2888 * [RFC 3542, Section 6]
2890 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2891 pktinfo->ipi6_ifindex == 0 &&
2892 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2893 ip6_clearpktopts(opt, optname);
2897 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2898 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2902 /* validate the interface index if specified. */
2903 if (pktinfo->ipi6_ifindex > if_index ||
2904 pktinfo->ipi6_ifindex < 0) {
2908 * Check if the requested source address is indeed a
2909 * unicast address assigned to the node, and can be
2910 * used as the packet's source address.
2912 if (opt->ip6po_pktinfo != NULL &&
2913 !IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) {
2914 struct in6_ifaddr *ia6;
2915 struct sockaddr_in6 sin6;
2917 bzero(&sin6, sizeof(sin6));
2918 sin6.sin6_len = sizeof(sin6);
2919 sin6.sin6_family = AF_INET6;
2921 opt->ip6po_pktinfo->ipi6_addr;
2922 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6));
2924 (ia6->ia6_flags & (IN6_IFF_ANYCAST |
2925 IN6_IFF_NOTREADY)) != 0)
2926 return (EADDRNOTAVAIL);
2930 * We store the address anyway, and let in6_selectsrc()
2931 * validate the specified address. This is because ipi6_addr
2932 * may not have enough information about its scope zone, and
2933 * we may need additional information (such as outgoing
2934 * interface or the scope zone of a destination address) to
2935 * disambiguate the scope.
2936 * XXX: the delay of the validation may confuse the
2937 * application when it is used as a sticky option.
2939 if (opt->ip6po_pktinfo == NULL) {
2940 opt->ip6po_pktinfo = kmalloc(sizeof(*pktinfo),
2941 M_IP6OPT, M_NOWAIT);
2942 if (opt->ip6po_pktinfo == NULL)
2945 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2949 case IPV6_2292HOPLIMIT:
2955 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2956 * to simplify the ordering among hoplimit options.
2958 if (optname == IPV6_HOPLIMIT && sticky)
2959 return (ENOPROTOOPT);
2961 if (len != sizeof(int))
2964 if (*hlimp < -1 || *hlimp > 255)
2967 opt->ip6po_hlim = *hlimp;
2975 if (len != sizeof(int))
2977 tclass = *(int *)buf;
2978 if (tclass < -1 || tclass > 255)
2981 opt->ip6po_tclass = tclass;
2985 case IPV6_2292NEXTHOP:
2990 if (len == 0) { /* just remove the option */
2991 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2995 /* check if cmsg_len is large enough for sa_len */
2996 if (len < sizeof(struct sockaddr) || len < *buf)
2999 switch (((struct sockaddr *)buf)->sa_family) {
3002 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
3005 if (sa6->sin6_len != sizeof(struct sockaddr_in6))
3008 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
3009 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
3014 case AF_LINK: /* should eventually be supported */
3016 return (EAFNOSUPPORT);
3019 /* turn off the previous option, then set the new option. */
3020 ip6_clearpktopts(opt, IPV6_NEXTHOP);
3021 opt->ip6po_nexthop = kmalloc(*buf, M_IP6OPT, M_NOWAIT);
3022 if (opt->ip6po_nexthop == NULL)
3024 bcopy(buf, opt->ip6po_nexthop, *buf);
3027 case IPV6_2292HOPOPTS:
3030 struct ip6_hbh *hbh;
3034 * XXX: We don't allow a non-privileged user to set ANY HbH
3035 * options, since per-option restriction has too much
3041 ip6_clearpktopts(opt, IPV6_HOPOPTS);
3042 break; /* just remove the option */
3045 /* message length validation */
3046 if (len < sizeof(struct ip6_hbh))
3048 hbh = (struct ip6_hbh *)buf;
3049 hbhlen = (hbh->ip6h_len + 1) << 3;
3053 /* turn off the previous option, then set the new option. */
3054 ip6_clearpktopts(opt, IPV6_HOPOPTS);
3055 opt->ip6po_hbh = kmalloc(hbhlen, M_IP6OPT, M_NOWAIT);
3056 if (opt->ip6po_hbh == NULL)
3058 bcopy(hbh, opt->ip6po_hbh, hbhlen);
3063 case IPV6_2292DSTOPTS:
3065 case IPV6_RTHDRDSTOPTS:
3067 struct ip6_dest *dest, **newdest = NULL;
3073 ip6_clearpktopts(opt, optname);
3074 break; /* just remove the option */
3077 /* message length validation */
3078 if (len < sizeof(struct ip6_dest))
3080 dest = (struct ip6_dest *)buf;
3081 destlen = (dest->ip6d_len + 1) << 3;
3086 * Determine the position that the destination options header
3087 * should be inserted; before or after the routing header.
3090 case IPV6_2292DSTOPTS:
3092 * The old advacned API is ambiguous on this point.
3093 * Our approach is to determine the position based
3094 * according to the existence of a routing header.
3095 * Note, however, that this depends on the order of the
3096 * extension headers in the ancillary data; the 1st
3097 * part of the destination options header must appear
3098 * before the routing header in the ancillary data,
3100 * RFC3542 solved the ambiguity by introducing
3101 * separate ancillary data or option types.
3103 if (opt->ip6po_rthdr == NULL)
3104 newdest = &opt->ip6po_dest1;
3106 newdest = &opt->ip6po_dest2;
3108 case IPV6_RTHDRDSTOPTS:
3109 newdest = &opt->ip6po_dest1;
3112 newdest = &opt->ip6po_dest2;
3116 /* turn off the previous option, then set the new option. */
3117 ip6_clearpktopts(opt, optname);
3118 *newdest = kmalloc(destlen, M_IP6OPT, M_NOWAIT);
3119 if (*newdest == NULL)
3121 bcopy(dest, *newdest, destlen);
3126 case IPV6_2292RTHDR:
3129 struct ip6_rthdr *rth;
3133 ip6_clearpktopts(opt, IPV6_RTHDR);
3134 break; /* just remove the option */
3137 /* message length validation */
3138 if (len < sizeof(struct ip6_rthdr))
3140 rth = (struct ip6_rthdr *)buf;
3141 rthlen = (rth->ip6r_len + 1) << 3;
3145 switch (rth->ip6r_type) {
3147 return (EINVAL); /* not supported */
3150 /* turn off the previous option */
3151 ip6_clearpktopts(opt, IPV6_RTHDR);
3152 opt->ip6po_rthdr = kmalloc(rthlen, M_IP6OPT, M_NOWAIT);
3153 if (opt->ip6po_rthdr == NULL)
3155 bcopy(rth, opt->ip6po_rthdr, rthlen);
3160 case IPV6_USE_MIN_MTU:
3161 if (len != sizeof(int))
3163 minmtupolicy = *(int *)buf;
3164 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
3165 minmtupolicy != IP6PO_MINMTU_DISABLE &&
3166 minmtupolicy != IP6PO_MINMTU_ALL) {
3169 opt->ip6po_minmtu = minmtupolicy;
3173 if (len != sizeof(int))
3176 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
3178 * we ignore this option for TCP sockets.
3179 * (RFC3542 leaves this case unspecified.)
3181 opt->ip6po_flags &= ~IP6PO_DONTFRAG;
3183 opt->ip6po_flags |= IP6PO_DONTFRAG;
3186 case IPV6_PREFER_TEMPADDR:
3187 if (len != sizeof(int))
3189 preftemp = *(int *)buf;
3190 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
3191 preftemp != IP6PO_TEMPADDR_NOTPREFER &&
3192 preftemp != IP6PO_TEMPADDR_PREFER) {
3195 opt->ip6po_prefer_tempaddr = preftemp;
3199 return (ENOPROTOOPT);
3200 } /* end of switch */
3207 * Set IPv6 outgoing packet options based on advanced API.
3210 ip6_setpktoptions(struct mbuf *control, struct ip6_pktopts *opt,
3211 struct ip6_pktopts *stickyopt, int uproto, int priv)
3213 struct cmsghdr *cm = NULL;
3215 if (control == NULL || opt == NULL)
3218 init_ip6pktopts(opt);
3221 * XXX: Currently, we assume all the optional information is stored
3228 * If stickyopt is provided, make a local copy of the options
3229 * for this particular packet, then override them by ancillary
3231 * XXX: copypktopts() does not copy the cached route to a next
3232 * hop (if any). This is not very good in terms of efficiency,
3233 * but we can allow this since this option should be rarely
3236 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
3241 * XXX: Currently, we assume all the optional information is stored
3244 if (control->m_next)
3247 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len),
3248 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
3251 if (control->m_len < CMSG_LEN(0))
3254 cm = mtod(control, struct cmsghdr *);
3255 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
3257 if (cm->cmsg_level != IPPROTO_IPV6)
3260 error = ip6_setpktoption(cm->cmsg_type, CMSG_DATA(cm),
3261 cm->cmsg_len - CMSG_LEN(0), opt, 0, 1, uproto, priv);
3270 * Routine called from ip6_output() to loop back a copy of an IP6 multicast
3271 * packet to the input queue of a specified interface. Note that this
3272 * calls the output routine of the loopback "driver", but with an interface
3273 * pointer that might NOT be &loif -- easier than replicating that code here.
3276 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst)
3279 struct ip6_hdr *ip6;
3281 copym = m_copy(m, 0, M_COPYALL);
3286 * Make sure to deep-copy IPv6 header portion in case the data
3287 * is in an mbuf cluster, so that we can safely override the IPv6
3288 * header portion later.
3290 if ((copym->m_flags & M_EXT) != 0 ||
3291 copym->m_len < sizeof(struct ip6_hdr)) {
3292 copym = m_pullup(copym, sizeof(struct ip6_hdr));
3298 if (copym->m_len < sizeof(*ip6)) {
3304 ip6 = mtod(copym, struct ip6_hdr *);
3306 * clear embedded scope identifiers if necessary.
3307 * in6_clearscope will touch the addresses only when necessary.
3309 in6_clearscope(&ip6->ip6_src);
3310 in6_clearscope(&ip6->ip6_dst);
3312 if_simloop(ifp, copym, dst->sin6_family, 0);
3316 * Separate the IPv6 header from the payload into its own mbuf.
3318 * Returns the new mbuf chain or the original mbuf if no payload.
3319 * Returns NULL if can't allocate new mbuf for header.
3321 static struct mbuf *
3322 ip6_splithdr(struct mbuf *m)
3326 if (m->m_len <= sizeof(struct ip6_hdr)) /* no payload */
3329 MGETHDR(mh, M_NOWAIT, MT_HEADER);
3332 mh->m_len = sizeof(struct ip6_hdr);
3333 M_MOVE_PKTHDR(mh, m);
3334 MH_ALIGN(mh, sizeof(struct ip6_hdr));
3335 bcopy(mtod(m, caddr_t), mtod(mh, caddr_t), sizeof(struct ip6_hdr));
3336 m->m_data += sizeof(struct ip6_hdr);
3337 m->m_len -= sizeof(struct ip6_hdr);
3343 * Compute IPv6 extension header length.
3346 ip6_optlen(struct in6pcb *in6p)
3350 if (!in6p->in6p_outputopts)
3355 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
3357 len += elen(in6p->in6p_outputopts->ip6po_hbh);
3358 if (in6p->in6p_outputopts->ip6po_rthdr)
3359 /* dest1 is valid with rthdr only */
3360 len += elen(in6p->in6p_outputopts->ip6po_dest1);
3361 len += elen(in6p->in6p_outputopts->ip6po_rthdr);
3362 len += elen(in6p->in6p_outputopts->ip6po_dest2);