1 /* $FreeBSD: src/sys/netinet6/ip6_output.c,v 1.13.2.18 2003/01/24 05:11:35 sam Exp $ */
2 /* $DragonFly: src/sys/netinet6/ip6_output.c,v 1.37 2008/09/04 09:08:22 hasso Exp $ */
3 /* $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ */
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66 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
69 #include "opt_ip6fw.h"
71 #include "opt_inet6.h"
72 #include "opt_ipsec.h"
74 #include <sys/param.h>
75 #include <sys/malloc.h>
77 #include <sys/errno.h>
78 #include <sys/protosw.h>
79 #include <sys/socket.h>
80 #include <sys/socketvar.h>
81 #include <sys/systm.h>
82 #include <sys/kernel.h>
87 #include <net/route.h>
90 #include <netinet/in.h>
91 #include <netinet/in_var.h>
92 #include <netinet6/in6_var.h>
93 #include <netinet/ip6.h>
94 #include <netinet/icmp6.h>
95 #include <netinet6/ip6_var.h>
96 #include <netinet/in_pcb.h>
97 #include <netinet6/nd6.h>
98 #include <netinet6/ip6protosw.h>
101 #include <netinet6/ipsec.h>
103 #include <netinet6/ipsec6.h>
105 #include <netproto/key/key.h>
109 #include <netproto/ipsec/ipsec.h>
110 #include <netproto/ipsec/ipsec6.h>
111 #include <netproto/ipsec/key.h>
114 #include <net/ip6fw/ip6_fw.h>
116 #include <net/net_osdep.h>
118 static MALLOC_DEFINE(M_IPMOPTS
, "ip6_moptions", "internet multicast options");
121 struct mbuf
*ip6e_ip6
;
122 struct mbuf
*ip6e_hbh
;
123 struct mbuf
*ip6e_dest1
;
124 struct mbuf
*ip6e_rthdr
;
125 struct mbuf
*ip6e_dest2
;
128 static int ip6_pcbopt (int, u_char
*, int, struct ip6_pktopts
**, int);
129 static int ip6_setpktoption (int, u_char
*, int, struct ip6_pktopts
*,
131 static int ip6_pcbopts (struct ip6_pktopts
**, struct mbuf
*,
132 struct socket
*, struct sockopt
*);
133 static int ip6_getpcbopt(struct ip6_pktopts
*, int, struct sockopt
*);
134 static int ip6_setmoptions (int, struct ip6_moptions
**, struct mbuf
*);
135 static int ip6_getmoptions (int, struct ip6_moptions
*, struct mbuf
**);
136 static int ip6_getpmtu(struct route_in6
*, struct route_in6
*,
137 struct ifnet
*, struct in6_addr
*, u_long
*, int *);
138 static int copyexthdr (void *, struct mbuf
**);
139 static int ip6_insertfraghdr (struct mbuf
*, struct mbuf
*, int,
141 static int ip6_insert_jumboopt (struct ip6_exthdrs
*, u_int32_t
);
142 static struct mbuf
*ip6_splithdr (struct mbuf
*);
143 static int copypktopts(struct ip6_pktopts
*, struct ip6_pktopts
*, int);
146 * IP6 output. The packet in mbuf chain m contains a skeletal IP6
147 * header (with pri, len, nxt, hlim, src, dst).
148 * This function may modify ver and hlim only.
149 * The mbuf chain containing the packet will be freed.
150 * The mbuf opt, if present, will not be freed.
152 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and
153 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one,
154 * which is rt_rmx.rmx_mtu.
157 ip6_output(struct mbuf
*m0
, struct ip6_pktopts
*opt
, struct route_in6
*ro
,
158 int flags
, struct ip6_moptions
*im6o
,
159 struct ifnet
**ifpp
, /* XXX: just for statistics */
162 struct ip6_hdr
*ip6
, *mhip6
;
163 struct ifnet
*ifp
, *origifp
;
167 int hlen
, tlen
, len
, off
;
168 struct route_in6 ip6route
;
169 struct sockaddr_in6
*dst
;
171 struct in6_ifaddr
*ia
= NULL
;
173 int alwaysfrag
, dontfrag
;
174 u_int32_t optlen
, plen
= 0, unfragpartlen
;
175 struct ip6_exthdrs exthdrs
;
176 struct in6_addr finaldst
;
177 struct route_in6
*ro_pmtu
= NULL
;
178 boolean_t hdrsplit
= FALSE
;
179 boolean_t needipsec
= FALSE
;
181 boolean_t needipsectun
= FALSE
;
182 struct secpolicy
*sp
= NULL
;
183 struct socket
*so
= inp
? inp
->inp_socket
: NULL
;
185 ip6
= mtod(m
, struct ip6_hdr
*);
188 boolean_t needipsectun
= FALSE
;
189 struct secpolicy
*sp
= NULL
;
191 ip6
= mtod(m
, struct ip6_hdr
*);
194 bzero(&exthdrs
, sizeof exthdrs
);
197 if ((error
= copyexthdr(opt
->ip6po_hbh
, &exthdrs
.ip6e_hbh
)))
199 if ((error
= copyexthdr(opt
->ip6po_dest1
, &exthdrs
.ip6e_dest1
)))
201 if ((error
= copyexthdr(opt
->ip6po_rthdr
, &exthdrs
.ip6e_rthdr
)))
203 if ((error
= copyexthdr(opt
->ip6po_dest2
, &exthdrs
.ip6e_dest2
)))
208 /* get a security policy for this packet */
210 sp
= ipsec6_getpolicybyaddr(m
, IPSEC_DIR_OUTBOUND
, 0, &error
);
212 sp
= ipsec6_getpolicybysock(m
, IPSEC_DIR_OUTBOUND
, so
, &error
);
215 ipsec6stat
.out_inval
++;
222 switch (sp
->policy
) {
223 case IPSEC_POLICY_DISCARD
:
225 * This packet is just discarded.
227 ipsec6stat
.out_polvio
++;
230 case IPSEC_POLICY_BYPASS
:
231 case IPSEC_POLICY_NONE
:
232 /* no need to do IPsec. */
236 case IPSEC_POLICY_IPSEC
:
237 if (sp
->req
== NULL
) {
238 error
= key_spdacquire(sp
); /* acquire a policy */
244 case IPSEC_POLICY_ENTRUST
:
246 kprintf("ip6_output: Invalid policy found. %d\n", sp
->policy
);
250 /* get a security policy for this packet */
252 sp
= ipsec_getpolicybyaddr(m
, IPSEC_DIR_OUTBOUND
, 0, &error
);
254 sp
= ipsec_getpolicybysock(m
, IPSEC_DIR_OUTBOUND
, inp
, &error
);
257 newipsecstat
.ips_out_inval
++;
264 switch (sp
->policy
) {
265 case IPSEC_POLICY_DISCARD
:
267 * This packet is just discarded.
269 newipsecstat
.ips_out_polvio
++;
272 case IPSEC_POLICY_BYPASS
:
273 case IPSEC_POLICY_NONE
:
274 /* no need to do IPsec. */
278 case IPSEC_POLICY_IPSEC
:
279 if (sp
->req
== NULL
) {
280 error
= key_spdacquire(sp
); /* acquire a policy */
286 case IPSEC_POLICY_ENTRUST
:
288 kprintf("ip6_output: Invalid policy found. %d\n", sp
->policy
);
290 #endif /* FAST_IPSEC */
293 * Calculate the total length of the extension header chain.
294 * Keep the length of the unfragmentable part for fragmentation.
296 optlen
= m_lengthm(exthdrs
.ip6e_hbh
, NULL
) +
297 m_lengthm(exthdrs
.ip6e_dest1
, NULL
) +
298 m_lengthm(exthdrs
.ip6e_rthdr
, NULL
);
300 unfragpartlen
= optlen
+ sizeof(struct ip6_hdr
);
302 /* NOTE: we don't add AH/ESP length here. do that later. */
303 optlen
+= m_lengthm(exthdrs
.ip6e_dest2
, NULL
);
306 * If we need IPsec, or there is at least one extension header,
307 * separate IP6 header from the payload.
309 if ((needipsec
|| optlen
) && !hdrsplit
) {
310 exthdrs
.ip6e_ip6
= ip6_splithdr(m
);
311 if (exthdrs
.ip6e_ip6
== NULL
) {
315 m
= exthdrs
.ip6e_ip6
;
320 ip6
= mtod(m
, struct ip6_hdr
*);
322 /* adjust mbuf packet header length */
323 m
->m_pkthdr
.len
+= optlen
;
324 plen
= m
->m_pkthdr
.len
- sizeof(*ip6
);
326 /* If this is a jumbo payload, insert a jumbo payload option. */
327 if (plen
> IPV6_MAXPACKET
) {
329 exthdrs
.ip6e_ip6
= ip6_splithdr(m
);
330 if (exthdrs
.ip6e_ip6
== NULL
) {
334 m
= exthdrs
.ip6e_ip6
;
338 ip6
= mtod(m
, struct ip6_hdr
*);
339 if ((error
= ip6_insert_jumboopt(&exthdrs
, plen
)) != 0)
343 ip6
->ip6_plen
= htons(plen
);
346 * Concatenate headers and fill in next header fields.
347 * Here we have, on "m"
349 * and we insert headers accordingly. Finally, we should be getting:
350 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
352 * during the header composing process, "m" points to IPv6 header.
353 * "mprev" points to an extension header prior to esp.
356 nexthdrp
= &ip6
->ip6_nxt
;
360 * we treat dest2 specially. this makes IPsec processing
361 * much easier. the goal here is to make mprev point the
362 * mbuf prior to dest2.
364 * result: IPv6 dest2 payload
365 * m and mprev will point to IPv6 header.
367 if (exthdrs
.ip6e_dest2
) {
369 panic("assumption failed: hdr not split");
370 exthdrs
.ip6e_dest2
->m_next
= m
->m_next
;
371 m
->m_next
= exthdrs
.ip6e_dest2
;
372 *mtod(exthdrs
.ip6e_dest2
, u_char
*) = ip6
->ip6_nxt
;
373 ip6
->ip6_nxt
= IPPROTO_DSTOPTS
;
377 * Place m1 after mprev.
379 #define MAKE_CHAIN(m1, mprev, nexthdrp, i)\
383 panic("assumption failed: hdr not split");\
384 *mtod(m1, u_char *) = *nexthdrp;\
386 nexthdrp = mtod(m1, u_char *);\
387 m1->m_next = mprev->m_next;\
394 * result: IPv6 hbh dest1 rthdr dest2 payload
395 * m will point to IPv6 header. mprev will point to the
396 * extension header prior to dest2 (rthdr in the above case).
398 MAKE_CHAIN(exthdrs
.ip6e_hbh
, mprev
, nexthdrp
, IPPROTO_HOPOPTS
);
399 MAKE_CHAIN(exthdrs
.ip6e_dest1
, mprev
, nexthdrp
, IPPROTO_DSTOPTS
);
400 MAKE_CHAIN(exthdrs
.ip6e_rthdr
, mprev
, nexthdrp
, IPPROTO_ROUTING
);
402 #if defined(IPSEC) || defined(FAST_IPSEC)
404 struct ipsec_output_state state
;
406 struct ip6_rthdr
*rh
= NULL
;
409 * pointers after IPsec headers are not valid any more.
410 * other pointers need a great care too.
411 * (IPsec routines should not mangle mbufs prior to AH/ESP)
413 exthdrs
.ip6e_dest2
= NULL
;
415 if (exthdrs
.ip6e_rthdr
) {
416 rh
= mtod(exthdrs
.ip6e_rthdr
, struct ip6_rthdr
*);
417 segleft_org
= rh
->ip6r_segleft
;
418 rh
->ip6r_segleft
= 0;
421 bzero(&state
, sizeof state
);
423 error
= ipsec6_output_trans(&state
, nexthdrp
, mprev
, sp
, flags
,
427 /* mbuf is already reclaimed in ipsec6_output_trans. */
437 kprintf("ip6_output (ipsec): error code %d\n",
441 /* don't show these error codes to the user */
447 if (exthdrs
.ip6e_rthdr
) {
448 /* ah6_output doesn't modify mbuf chain */
449 rh
->ip6r_segleft
= segleft_org
;
455 * If there is a routing header, replace destination address field
456 * with the first hop of the routing header.
458 if (exthdrs
.ip6e_rthdr
) {
459 struct ip6_rthdr
*rh
;
461 finaldst
= ip6
->ip6_dst
;
462 rh
= mtod(exthdrs
.ip6e_rthdr
, struct ip6_rthdr
*);
463 switch (rh
->ip6r_type
) {
464 default: /* is it possible? */
470 /* Source address validation */
471 if (IN6_IS_ADDR_UNSPECIFIED(&ip6
->ip6_src
) &&
472 !(flags
& IPV6_DADOUTPUT
)) {
474 ip6stat
.ip6s_badscope
++;
477 if (IN6_IS_ADDR_MULTICAST(&ip6
->ip6_src
)) {
479 ip6stat
.ip6s_badscope
++;
483 ip6stat
.ip6s_localout
++;
490 bzero(ro
, sizeof(*ro
));
493 if (opt
&& opt
->ip6po_rthdr
)
494 ro
= &opt
->ip6po_route
;
495 dst
= (struct sockaddr_in6
*)&ro
->ro_dst
;
497 * If there is a cached route,
498 * check that it is to the same destination
499 * and is still up. If not, free it and try again.
501 if (ro
->ro_rt
!= NULL
&&
502 (!(ro
->ro_rt
->rt_flags
& RTF_UP
) || dst
->sin6_family
!= AF_INET6
||
503 !IN6_ARE_ADDR_EQUAL(&dst
->sin6_addr
, &ip6
->ip6_dst
))) {
507 if (ro
->ro_rt
== NULL
) {
508 bzero(dst
, sizeof(*dst
));
509 dst
->sin6_family
= AF_INET6
;
510 dst
->sin6_len
= sizeof(struct sockaddr_in6
);
511 dst
->sin6_addr
= ip6
->ip6_dst
;
513 #if defined(IPSEC) || defined(FAST_IPSEC)
514 if (needipsec
&& needipsectun
) {
515 struct ipsec_output_state state
;
518 * All the extension headers will become inaccessible
519 * (since they can be encrypted).
520 * Don't panic, we need no more updates to extension headers
521 * on inner IPv6 packet (since they are now encapsulated).
523 * IPv6 [ESP|AH] IPv6 [extension headers] payload
525 bzero(&exthdrs
, sizeof(exthdrs
));
526 exthdrs
.ip6e_ip6
= m
;
528 bzero(&state
, sizeof(state
));
530 state
.ro
= (struct route
*)ro
;
531 state
.dst
= (struct sockaddr
*)dst
;
533 error
= ipsec6_output_tunnel(&state
, sp
, flags
);
536 ro
= (struct route_in6
*)state
.ro
;
537 dst
= (struct sockaddr_in6
*)state
.dst
;
539 /* mbuf is already reclaimed in ipsec6_output_tunnel. */
550 kprintf("ip6_output (ipsec): error code %d\n", error
);
553 /* don't show these error codes to the user */
560 exthdrs
.ip6e_ip6
= m
;
564 if (!IN6_IS_ADDR_MULTICAST(&ip6
->ip6_dst
)) {
567 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
568 #define sin6tosa(sin6) ((struct sockaddr *)(sin6))
570 * interface selection comes here
571 * if an interface is specified from an upper layer,
574 if (ro
->ro_rt
== NULL
) {
576 * non-bsdi always clone routes, if parent is
579 rtalloc((struct route
*)ro
);
581 if (ro
->ro_rt
== NULL
) {
582 ip6stat
.ip6s_noroute
++;
583 error
= EHOSTUNREACH
;
584 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */
587 ia
= ifatoia6(ro
->ro_rt
->rt_ifa
);
588 ifp
= ro
->ro_rt
->rt_ifp
;
590 if (ro
->ro_rt
->rt_flags
& RTF_GATEWAY
)
591 dst
= (struct sockaddr_in6
*)ro
->ro_rt
->rt_gateway
;
592 m
->m_flags
&= ~(M_BCAST
| M_MCAST
); /* just in case */
594 in6_ifstat_inc(ifp
, ifs6_out_request
);
597 * Check if the outgoing interface conflicts with
598 * the interface specified by ifi6_ifindex (if specified).
599 * Note that loopback interface is always okay.
600 * (this may happen when we are sending a packet to one of
601 * our own addresses.)
603 if (opt
&& opt
->ip6po_pktinfo
604 && opt
->ip6po_pktinfo
->ipi6_ifindex
) {
605 if (!(ifp
->if_flags
& IFF_LOOPBACK
)
606 && ifp
->if_index
!= opt
->ip6po_pktinfo
->ipi6_ifindex
) {
607 ip6stat
.ip6s_noroute
++;
608 in6_ifstat_inc(ifp
, ifs6_out_discard
);
609 error
= EHOSTUNREACH
;
614 if (opt
&& opt
->ip6po_hlim
!= -1)
615 ip6
->ip6_hlim
= opt
->ip6po_hlim
& 0xff;
618 struct in6_multi
*in6m
;
620 m
->m_flags
= (m
->m_flags
& ~M_BCAST
) | M_MCAST
;
623 * See if the caller provided any multicast options
627 ip6
->ip6_hlim
= im6o
->im6o_multicast_hlim
;
628 if (im6o
->im6o_multicast_ifp
!= NULL
)
629 ifp
= im6o
->im6o_multicast_ifp
;
631 ip6
->ip6_hlim
= ip6_defmcasthlim
;
634 * See if the caller provided the outgoing interface
635 * as an ancillary data.
636 * Boundary check for ifindex is assumed to be already done.
638 if (opt
&& opt
->ip6po_pktinfo
&& opt
->ip6po_pktinfo
->ipi6_ifindex
)
639 ifp
= ifindex2ifnet
[opt
->ip6po_pktinfo
->ipi6_ifindex
];
642 * If the destination is a node-local scope multicast,
643 * the packet should be loop-backed only.
645 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6
->ip6_dst
)) {
647 * If the outgoing interface is already specified,
648 * it should be a loopback interface.
650 if (ifp
&& !(ifp
->if_flags
& IFF_LOOPBACK
)) {
651 ip6stat
.ip6s_badscope
++;
652 error
= ENETUNREACH
; /* XXX: better error? */
653 /* XXX correct ifp? */
654 in6_ifstat_inc(ifp
, ifs6_out_discard
);
661 if (opt
&& opt
->ip6po_hlim
!= -1)
662 ip6
->ip6_hlim
= opt
->ip6po_hlim
& 0xff;
665 * If caller did not provide an interface lookup a
666 * default in the routing table. This is either a
667 * default for the speicfied group (i.e. a host
668 * route), or a multicast default (a route for the
672 if (ro
->ro_rt
== NULL
) {
674 rtpurelookup((struct sockaddr
*)&ro
->ro_dst
);
676 if (ro
->ro_rt
== NULL
) {
677 ip6stat
.ip6s_noroute
++;
678 error
= EHOSTUNREACH
;
679 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */
682 ia
= ifatoia6(ro
->ro_rt
->rt_ifa
);
683 ifp
= ro
->ro_rt
->rt_ifp
;
687 if (!(flags
& IPV6_FORWARDING
))
688 in6_ifstat_inc(ifp
, ifs6_out_request
);
689 in6_ifstat_inc(ifp
, ifs6_out_mcast
);
692 * Confirm that the outgoing interface supports multicast.
694 if (!(ifp
->if_flags
& IFF_MULTICAST
)) {
695 ip6stat
.ip6s_noroute
++;
696 in6_ifstat_inc(ifp
, ifs6_out_discard
);
700 IN6_LOOKUP_MULTI(ip6
->ip6_dst
, ifp
, in6m
);
702 (im6o
== NULL
|| im6o
->im6o_multicast_loop
)) {
704 * If we belong to the destination multicast group
705 * on the outgoing interface, and the caller did not
706 * forbid loopback, loop back a copy.
708 ip6_mloopback(ifp
, m
, dst
);
711 * If we are acting as a multicast router, perform
712 * multicast forwarding as if the packet had just
713 * arrived on the interface to which we are about
714 * to send. The multicast forwarding function
715 * recursively calls this function, using the
716 * IPV6_FORWARDING flag to prevent infinite recursion.
718 * Multicasts that are looped back by ip6_mloopback(),
719 * above, will be forwarded by the ip6_input() routine,
722 if (ip6_mrouter
&& !(flags
& IPV6_FORWARDING
)) {
723 if (ip6_mforward(ip6
, ifp
, m
) != 0) {
730 * Multicasts with a hoplimit of zero may be looped back,
731 * above, but must not be transmitted on a network.
732 * Also, multicasts addressed to the loopback interface
733 * are not sent -- the above call to ip6_mloopback() will
734 * loop back a copy if this host actually belongs to the
735 * destination group on the loopback interface.
737 if (ip6
->ip6_hlim
== 0 || (ifp
->if_flags
& IFF_LOOPBACK
)) {
744 * Fill the outgoing inteface to tell the upper layer
745 * to increment per-interface statistics.
750 /* Determine path MTU. */
751 if ((error
= ip6_getpmtu(ro_pmtu
, ro
, ifp
, &finaldst
, &mtu
,
756 * The caller of this function may specify to use the minimum MTU
758 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
759 * setting. The logic is a bit complicated; by default, unicast
760 * packets will follow path MTU while multicast packets will be sent at
761 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
762 * including unicast ones will be sent at the minimum MTU. Multicast
763 * packets will always be sent at the minimum MTU unless
764 * IP6PO_MINMTU_DISABLE is explicitly specified.
765 * See RFC 3542 for more details.
767 if (mtu
> IPV6_MMTU
) {
768 if ((flags
& IPV6_MINMTU
))
770 else if (opt
&& opt
->ip6po_minmtu
== IP6PO_MINMTU_ALL
)
772 else if (IN6_IS_ADDR_MULTICAST(&ip6
->ip6_dst
) &&
774 opt
->ip6po_minmtu
!= IP6PO_MINMTU_DISABLE
)) {
779 /* Fake scoped addresses */
780 if ((ifp
->if_flags
& IFF_LOOPBACK
) != 0) {
782 * If source or destination address is a scoped address, and
783 * the packet is going to be sent to a loopback interface,
784 * we should keep the original interface.
788 * XXX: this is a very experimental and temporary solution.
789 * We eventually have sockaddr_in6 and use the sin6_scope_id
790 * field of the structure here.
791 * We rely on the consistency between two scope zone ids
792 * of source and destination, which should already be assured.
793 * Larger scopes than link will be supported in the future.
796 if (IN6_IS_SCOPE_LINKLOCAL(&ip6
->ip6_src
))
797 origifp
= ifindex2ifnet
[ntohs(ip6
->ip6_src
.s6_addr16
[1])];
798 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6
->ip6_dst
))
799 origifp
= ifindex2ifnet
[ntohs(ip6
->ip6_dst
.s6_addr16
[1])];
801 * XXX: origifp can be NULL even in those two cases above.
802 * For example, if we remove the (only) link-local address
803 * from the loopback interface, and try to send a link-local
804 * address without link-id information. Then the source
805 * address is ::1, and the destination address is the
806 * link-local address with its s6_addr16[1] being zero.
807 * What is worse, if the packet goes to the loopback interface
808 * by a default rejected route, the null pointer would be
809 * passed to looutput, and the kernel would hang.
810 * The following last resort would prevent such disaster.
818 * clear embedded scope identifiers if necessary.
819 * in6_clearscope will touch the addresses only when necessary.
821 in6_clearscope(&ip6
->ip6_src
);
822 in6_clearscope(&ip6
->ip6_dst
);
825 * Check with the firewall...
827 if (ip6_fw_enable
&& ip6_fw_chk_ptr
) {
830 m
->m_pkthdr
.rcvif
= NULL
; /* XXX */
831 /* If ipfw says divert, we have to just drop packet */
832 if ((*ip6_fw_chk_ptr
)(&ip6
, ifp
, &port
, &m
)) {
843 * If the outgoing packet contains a hop-by-hop options header,
844 * it must be examined and processed even by the source node.
845 * (RFC 2460, section 4.)
847 if (exthdrs
.ip6e_hbh
) {
848 struct ip6_hbh
*hbh
= mtod(exthdrs
.ip6e_hbh
, struct ip6_hbh
*);
849 u_int32_t dummy1
; /* XXX unused */
850 u_int32_t dummy2
; /* XXX unused */
853 if ((hbh
->ip6h_len
+ 1) << 3 > exthdrs
.ip6e_hbh
->m_len
)
854 panic("ip6e_hbh is not continuous");
857 * XXX: if we have to send an ICMPv6 error to the sender,
858 * we need the M_LOOP flag since icmp6_error() expects
859 * the IPv6 and the hop-by-hop options header are
860 * continuous unless the flag is set.
862 m
->m_flags
|= M_LOOP
;
863 m
->m_pkthdr
.rcvif
= ifp
;
864 if (ip6_process_hopopts(m
,
865 (u_int8_t
*)(hbh
+ 1),
866 ((hbh
->ip6h_len
+ 1) << 3) -
867 sizeof(struct ip6_hbh
),
868 &dummy1
, &dummy2
) < 0) {
869 /* m was already freed at this point */
870 error
= EINVAL
;/* better error? */
873 m
->m_flags
&= ~M_LOOP
; /* XXX */
874 m
->m_pkthdr
.rcvif
= NULL
;
878 * Run through list of hooks for output packets.
880 if (pfil_has_hooks(&inet6_pfil_hook
)) {
881 error
= pfil_run_hooks(&inet6_pfil_hook
, &m
, ifp
, PFIL_OUT
);
882 if (error
!= 0 || m
== NULL
)
884 ip6
= mtod(m
, struct ip6_hdr
*);
888 * Send the packet to the outgoing interface.
889 * If necessary, do IPv6 fragmentation before sending.
891 * the logic here is rather complex:
892 * 1: normal case (dontfrag == 0, alwaysfrag == 0)
893 * 1-a: send as is if tlen <= path mtu
894 * 1-b: fragment if tlen > path mtu
896 * 2: if user asks us not to fragment (dontfrag == 1)
897 * 2-a: send as is if tlen <= interface mtu
898 * 2-b: error if tlen > interface mtu
900 * 3: if we always need to attach fragment header (alwaysfrag == 1)
903 * 4: if dontfrag == 1 && alwaysfrag == 1
904 * error, as we cannot handle this conflicting request
906 tlen
= m
->m_pkthdr
.len
;
908 if (opt
&& (opt
->ip6po_flags
& IP6PO_DONTFRAG
))
912 if (dontfrag
&& alwaysfrag
) { /* case 4 */
913 /* conflicting request - can't transmit */
917 if (dontfrag
&& tlen
> IN6_LINKMTU(ifp
)) { /* case 2-b */
919 * Even if the DONTFRAG option is specified, we cannot send the
920 * packet when the data length is larger than the MTU of the
921 * outgoing interface.
922 * Notify the error by sending IPV6_PATHMTU ancillary data as
923 * well as returning an error code (the latter is not described
927 struct ip6ctlparam ip6cp
;
929 mtu32
= (u_int32_t
)mtu
;
930 bzero(&ip6cp
, sizeof(ip6cp
));
931 ip6cp
.ip6c_cmdarg
= (void *)&mtu32
;
932 kpfctlinput2(PRC_MSGSIZE
, (struct sockaddr
*)&ro_pmtu
->ro_dst
,
940 * transmit packet without fragmentation
942 if (dontfrag
|| (!alwaysfrag
&& tlen
<= mtu
)) { /* case 1-a and 2-a */
943 struct in6_ifaddr
*ia6
;
945 ip6
= mtod(m
, struct ip6_hdr
*);
946 ia6
= in6_ifawithifp(ifp
, &ip6
->ip6_src
);
948 /* Record statistics for this interface address. */
949 ia6
->ia_ifa
.if_opackets
++;
950 ia6
->ia_ifa
.if_obytes
+= m
->m_pkthdr
.len
;
953 /* clean ipsec history once it goes out of the node */
956 error
= nd6_output(ifp
, origifp
, m
, dst
, ro
->ro_rt
);
961 * try to fragment the packet. case 1-b and 3
963 if (mtu
< IPV6_MMTU
) {
965 * note that path MTU is never less than IPV6_MMTU
969 in6_ifstat_inc(ifp
, ifs6_out_fragfail
);
971 } else if (ip6
->ip6_plen
== 0) { /* jumbo payload cannot be fragmented */
973 in6_ifstat_inc(ifp
, ifs6_out_fragfail
);
976 struct mbuf
**mnext
, *m_frgpart
;
977 struct ip6_frag
*ip6f
;
978 u_int32_t id
= htonl(ip6_id
++);
979 int qslots
= ifp
->if_snd
.ifq_maxlen
- ifp
->if_snd
.ifq_len
;
983 * Too large for the destination or interface;
984 * fragment if possible.
985 * Must be able to put at least 8 bytes per fragment.
987 hlen
= unfragpartlen
;
988 if (mtu
> IPV6_MAXPACKET
)
989 mtu
= IPV6_MAXPACKET
;
991 len
= (mtu
- hlen
- sizeof(struct ip6_frag
)) & ~7;
994 in6_ifstat_inc(ifp
, ifs6_out_fragfail
);
999 * Verify that we have any chance at all of being able to queue
1000 * the packet or packet fragments
1002 if (qslots
<= 0 || ((u_int
)qslots
* (mtu
- hlen
)
1003 < tlen
/* - hlen */)) {
1005 ip6stat
.ip6s_odropped
++;
1009 mnext
= &m
->m_nextpkt
;
1012 * Change the next header field of the last header in the
1013 * unfragmentable part.
1015 if (exthdrs
.ip6e_rthdr
) {
1016 nextproto
= *mtod(exthdrs
.ip6e_rthdr
, u_char
*);
1017 *mtod(exthdrs
.ip6e_rthdr
, u_char
*) = IPPROTO_FRAGMENT
;
1018 } else if (exthdrs
.ip6e_dest1
) {
1019 nextproto
= *mtod(exthdrs
.ip6e_dest1
, u_char
*);
1020 *mtod(exthdrs
.ip6e_dest1
, u_char
*) = IPPROTO_FRAGMENT
;
1021 } else if (exthdrs
.ip6e_hbh
) {
1022 nextproto
= *mtod(exthdrs
.ip6e_hbh
, u_char
*);
1023 *mtod(exthdrs
.ip6e_hbh
, u_char
*) = IPPROTO_FRAGMENT
;
1025 nextproto
= ip6
->ip6_nxt
;
1026 ip6
->ip6_nxt
= IPPROTO_FRAGMENT
;
1030 * Loop through length of segment after first fragment,
1031 * make new header and copy data of each part and link onto
1035 for (off
= hlen
; off
< tlen
; off
+= len
) {
1036 MGETHDR(m
, MB_DONTWAIT
, MT_HEADER
);
1039 ip6stat
.ip6s_odropped
++;
1042 m
->m_pkthdr
.rcvif
= NULL
;
1043 m
->m_flags
= m0
->m_flags
& M_COPYFLAGS
;
1045 mnext
= &m
->m_nextpkt
;
1046 m
->m_data
+= max_linkhdr
;
1047 mhip6
= mtod(m
, struct ip6_hdr
*);
1049 m
->m_len
= sizeof(*mhip6
);
1050 error
= ip6_insertfraghdr(m0
, m
, hlen
, &ip6f
);
1052 ip6stat
.ip6s_odropped
++;
1055 ip6f
->ip6f_offlg
= htons((u_short
)((off
- hlen
) & ~7));
1056 if (off
+ len
>= tlen
)
1059 ip6f
->ip6f_offlg
|= IP6F_MORE_FRAG
;
1060 mhip6
->ip6_plen
= htons((u_short
)(len
+ hlen
+
1062 sizeof(struct ip6_hdr
)));
1063 if ((m_frgpart
= m_copy(m0
, off
, len
)) == NULL
) {
1065 ip6stat
.ip6s_odropped
++;
1068 m_cat(m
, m_frgpart
);
1069 m
->m_pkthdr
.len
= len
+ hlen
+ sizeof(*ip6f
);
1070 m
->m_pkthdr
.rcvif
= NULL
;
1071 ip6f
->ip6f_reserved
= 0;
1072 ip6f
->ip6f_ident
= id
;
1073 ip6f
->ip6f_nxt
= nextproto
;
1074 ip6stat
.ip6s_ofragments
++;
1075 in6_ifstat_inc(ifp
, ifs6_out_fragcreat
);
1078 in6_ifstat_inc(ifp
, ifs6_out_fragok
);
1082 * Remove leading garbages.
1086 m0
->m_nextpkt
= NULL
;
1088 for (m0
= m
; m
; m
= m0
) {
1090 m
->m_nextpkt
= NULL
;
1092 /* Record statistics for this interface address. */
1094 ia
->ia_ifa
.if_opackets
++;
1095 ia
->ia_ifa
.if_obytes
+= m
->m_pkthdr
.len
;
1098 /* clean ipsec history once it goes out of the node */
1101 error
= nd6_output(ifp
, origifp
, m
, dst
, ro
->ro_rt
);
1107 ip6stat
.ip6s_fragmented
++;
1110 if (ro
== &ip6route
&& ro
->ro_rt
) { /* brace necessary for RTFREE */
1112 } else if (ro_pmtu
== &ip6route
&& ro_pmtu
->ro_rt
) {
1113 RTFREE(ro_pmtu
->ro_rt
);
1128 m_freem(exthdrs
.ip6e_hbh
); /* m_freem will check if mbuf is 0 */
1129 m_freem(exthdrs
.ip6e_dest1
);
1130 m_freem(exthdrs
.ip6e_rthdr
);
1131 m_freem(exthdrs
.ip6e_dest2
);
1139 copyexthdr(void *h
, struct mbuf
**mp
)
1141 struct ip6_ext
*hdr
= h
;
1148 hlen
= (hdr
->ip6e_len
+ 1) * 8;
1149 if (hlen
> MCLBYTES
)
1150 return ENOBUFS
; /* XXX */
1152 m
= m_getb(hlen
, MB_DONTWAIT
, MT_DATA
, 0);
1157 bcopy(hdr
, mtod(m
, caddr_t
), hlen
);
1164 * Insert jumbo payload option.
1167 ip6_insert_jumboopt(struct ip6_exthdrs
*exthdrs
, u_int32_t plen
)
1173 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */
1176 * If there is no hop-by-hop options header, allocate new one.
1177 * If there is one but it doesn't have enough space to store the
1178 * jumbo payload option, allocate a cluster to store the whole options.
1179 * Otherwise, use it to store the options.
1181 if (exthdrs
->ip6e_hbh
== NULL
) {
1182 MGET(mopt
, MB_DONTWAIT
, MT_DATA
);
1185 mopt
->m_len
= JUMBOOPTLEN
;
1186 optbuf
= mtod(mopt
, u_char
*);
1187 optbuf
[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */
1188 exthdrs
->ip6e_hbh
= mopt
;
1190 struct ip6_hbh
*hbh
;
1192 mopt
= exthdrs
->ip6e_hbh
;
1193 if (M_TRAILINGSPACE(mopt
) < JUMBOOPTLEN
) {
1196 * - exthdrs->ip6e_hbh is not referenced from places
1197 * other than exthdrs.
1198 * - exthdrs->ip6e_hbh is not an mbuf chain.
1200 int oldoptlen
= mopt
->m_len
;
1204 * XXX: give up if the whole (new) hbh header does
1205 * not fit even in an mbuf cluster.
1207 if (oldoptlen
+ JUMBOOPTLEN
> MCLBYTES
)
1211 * As a consequence, we must always prepare a cluster
1214 n
= m_getcl(MB_DONTWAIT
, MT_DATA
, 0);
1217 n
->m_len
= oldoptlen
+ JUMBOOPTLEN
;
1218 bcopy(mtod(mopt
, caddr_t
), mtod(n
, caddr_t
), oldoptlen
);
1219 optbuf
= mtod(n
, caddr_t
) + oldoptlen
;
1221 mopt
= exthdrs
->ip6e_hbh
= n
;
1223 optbuf
= mtod(mopt
, u_char
*) + mopt
->m_len
;
1224 mopt
->m_len
+= JUMBOOPTLEN
;
1226 optbuf
[0] = IP6OPT_PADN
;
1230 * Adjust the header length according to the pad and
1231 * the jumbo payload option.
1233 hbh
= mtod(mopt
, struct ip6_hbh
*);
1234 hbh
->ip6h_len
+= (JUMBOOPTLEN
>> 3);
1237 /* fill in the option. */
1238 optbuf
[2] = IP6OPT_JUMBO
;
1240 v
= (u_int32_t
)htonl(plen
+ JUMBOOPTLEN
);
1241 bcopy(&v
, &optbuf
[4], sizeof(u_int32_t
));
1243 /* finally, adjust the packet header length */
1244 exthdrs
->ip6e_ip6
->m_pkthdr
.len
+= JUMBOOPTLEN
;
1251 * Insert fragment header and copy unfragmentable header portions.
1254 ip6_insertfraghdr(struct mbuf
*m0
, struct mbuf
*m
, int hlen
,
1255 struct ip6_frag
**frghdrp
)
1257 struct mbuf
*n
, *mlast
;
1259 if (hlen
> sizeof(struct ip6_hdr
)) {
1260 n
= m_copym(m0
, sizeof(struct ip6_hdr
),
1261 hlen
- sizeof(struct ip6_hdr
), MB_DONTWAIT
);
1268 /* Search for the last mbuf of unfragmentable part. */
1269 for (mlast
= n
; mlast
->m_next
; mlast
= mlast
->m_next
)
1272 if (!(mlast
->m_flags
& M_EXT
) &&
1273 M_TRAILINGSPACE(mlast
) >= sizeof(struct ip6_frag
)) {
1274 /* use the trailing space of the last mbuf for the fragment hdr */
1276 (struct ip6_frag
*)(mtod(mlast
, caddr_t
) + mlast
->m_len
);
1277 mlast
->m_len
+= sizeof(struct ip6_frag
);
1278 m
->m_pkthdr
.len
+= sizeof(struct ip6_frag
);
1280 /* allocate a new mbuf for the fragment header */
1283 MGET(mfrg
, MB_DONTWAIT
, MT_DATA
);
1286 mfrg
->m_len
= sizeof(struct ip6_frag
);
1287 *frghdrp
= mtod(mfrg
, struct ip6_frag
*);
1288 mlast
->m_next
= mfrg
;
1295 ip6_getpmtu(struct route_in6
*ro_pmtu
, struct route_in6
*ro
,
1296 struct ifnet
*ifp
, struct in6_addr
*dst
, u_long
*mtup
,
1303 if (ro_pmtu
!= ro
) {
1304 /* The first hop and the final destination may differ. */
1305 struct sockaddr_in6
*sa6_dst
=
1306 (struct sockaddr_in6
*)&ro_pmtu
->ro_dst
;
1307 if (ro_pmtu
->ro_rt
&&
1308 ((ro_pmtu
->ro_rt
->rt_flags
& RTF_UP
) == 0 ||
1309 !IN6_ARE_ADDR_EQUAL(&sa6_dst
->sin6_addr
, dst
))) {
1310 RTFREE(ro_pmtu
->ro_rt
);
1311 ro_pmtu
->ro_rt
= NULL
;
1313 if (ro_pmtu
->ro_rt
== NULL
) {
1314 bzero(sa6_dst
, sizeof(*sa6_dst
));
1315 sa6_dst
->sin6_family
= AF_INET6
;
1316 sa6_dst
->sin6_len
= sizeof(struct sockaddr_in6
);
1317 sa6_dst
->sin6_addr
= *dst
;
1319 rtalloc((struct route
*)ro_pmtu
);
1322 if (ro_pmtu
->ro_rt
) {
1324 struct in_conninfo inc
;
1326 bzero(&inc
, sizeof(inc
));
1327 inc
.inc_flags
= 1; /* IPv6 */
1328 inc
.inc6_faddr
= *dst
;
1331 ifp
= ro_pmtu
->ro_rt
->rt_ifp
;
1332 ifmtu
= IN6_LINKMTU(ifp
);
1333 mtu
= ro_pmtu
->ro_rt
->rt_rmx
.rmx_mtu
;
1336 else if (mtu
< IPV6_MMTU
) {
1338 * RFC2460 section 5, last paragraph:
1339 * if we record ICMPv6 too big message with
1340 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1341 * or smaller, with framgent header attached.
1342 * (fragment header is needed regardless from the
1343 * packet size, for translators to identify packets)
1347 } else if (mtu
> ifmtu
) {
1349 * The MTU on the route is larger than the MTU on
1350 * the interface! This shouldn't happen, unless the
1351 * MTU of the interface has been changed after the
1352 * interface was brought up. Change the MTU in the
1353 * route to match the interface MTU (as long as the
1354 * field isn't locked).
1357 ro_pmtu
->ro_rt
->rt_rmx
.rmx_mtu
= mtu
;
1360 mtu
= IN6_LINKMTU(ifp
);
1362 error
= EHOSTUNREACH
; /* XXX */
1366 *alwaysfragp
= alwaysfrag
;
1371 * IP6 socket option processing.
1374 ip6_ctloutput(struct socket
*so
, struct sockopt
*sopt
)
1376 int optdatalen
,uproto
;
1378 struct inpcb
*in6p
= so
->so_pcb
;
1381 int level
, op
, optname
;
1386 level
= sopt
->sopt_level
;
1387 op
= sopt
->sopt_dir
;
1388 optname
= sopt
->sopt_name
;
1389 optlen
= sopt
->sopt_valsize
;
1392 panic("ip6_ctloutput: arg soopt is NULL");
1398 uproto
= (int)so
->so_proto
->pr_protocol
;
1399 privileged
= (td
== NULL
|| priv_check(td
, PRIV_ROOT
)) ? 0 : 1;
1401 if (level
== IPPROTO_IPV6
) {
1406 case IPV6_2292PKTOPTIONS
:
1407 #ifdef IPV6_PKTOPTIONS
1408 case IPV6_PKTOPTIONS
:
1413 error
= soopt_getm(sopt
, &m
); /* XXX */
1416 soopt_to_mbuf(sopt
, m
); /* XXX */
1417 error
= ip6_pcbopts(&in6p
->in6p_outputopts
,
1419 m_freem(m
); /* XXX */
1424 * Use of some Hop-by-Hop options or some
1425 * Destination options, might require special
1426 * privilege. That is, normal applications
1427 * (without special privilege) might be forbidden
1428 * from setting certain options in outgoing packets,
1429 * and might never see certain options in received
1430 * packets. [RFC 2292 Section 6]
1431 * KAME specific note:
1432 * KAME prevents non-privileged users from sending or
1433 * receiving ANY hbh/dst options in order to avoid
1434 * overhead of parsing options in the kernel.
1436 case IPV6_RECVHOPOPTS
:
1437 case IPV6_RECVDSTOPTS
:
1438 case IPV6_RECVRTHDRDSTOPTS
:
1441 case IPV6_RECVPKTINFO
:
1442 case IPV6_RECVHOPLIMIT
:
1443 case IPV6_RECVRTHDR
:
1444 case IPV6_RECVPATHMTU
:
1445 case IPV6_RECVTCLASS
:
1446 case IPV6_AUTOFLOWLABEL
:
1449 case IPV6_UNICAST_HOPS
:
1453 if (optlen
!= sizeof(int)) {
1457 error
= soopt_to_kbuf(sopt
, &optval
,
1458 sizeof optval
, sizeof optval
);
1463 case IPV6_UNICAST_HOPS
:
1464 if (optval
< -1 || optval
>= 256)
1467 /* -1 = kernel default */
1468 in6p
->in6p_hops
= optval
;
1470 if ((in6p
->in6p_vflag
&
1472 in6p
->inp_ip_ttl
= optval
;
1475 #define OPTSET(bit) \
1478 in6p->in6p_flags |= (bit); \
1480 in6p->in6p_flags &= ~(bit); \
1482 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0)
1484 * Although changed to RFC3542, It's better to also support RFC2292 API
1486 #define OPTSET2292(bit) \
1488 in6p->in6p_flags |= IN6P_RFC2292; \
1490 in6p->in6p_flags |= (bit); \
1492 in6p->in6p_flags &= ~(bit); \
1493 } while (/*CONSTCOND*/ 0)
1495 case IPV6_RECVPKTINFO
:
1496 /* cannot mix with RFC2292 */
1497 if (OPTBIT(IN6P_RFC2292
)) {
1501 OPTSET(IN6P_PKTINFO
);
1506 struct ip6_pktopts
**optp
;
1508 /* cannot mix with RFC2292 */
1509 if (OPTBIT(IN6P_RFC2292
)) {
1513 optp
= &in6p
->in6p_outputopts
;
1514 error
= ip6_pcbopt(IPV6_HOPLIMIT
,
1515 (u_char
*)&optval
, sizeof(optval
),
1520 case IPV6_RECVHOPLIMIT
:
1521 /* cannot mix with RFC2292 */
1522 if (OPTBIT(IN6P_RFC2292
)) {
1526 OPTSET(IN6P_HOPLIMIT
);
1529 case IPV6_RECVHOPOPTS
:
1530 /* cannot mix with RFC2292 */
1531 if (OPTBIT(IN6P_RFC2292
)) {
1535 OPTSET(IN6P_HOPOPTS
);
1538 case IPV6_RECVDSTOPTS
:
1539 /* cannot mix with RFC2292 */
1540 if (OPTBIT(IN6P_RFC2292
)) {
1544 OPTSET(IN6P_DSTOPTS
);
1547 case IPV6_RECVRTHDRDSTOPTS
:
1548 /* cannot mix with RFC2292 */
1549 if (OPTBIT(IN6P_RFC2292
)) {
1553 OPTSET(IN6P_RTHDRDSTOPTS
);
1556 case IPV6_RECVRTHDR
:
1557 /* cannot mix with RFC2292 */
1558 if (OPTBIT(IN6P_RFC2292
)) {
1565 case IPV6_RECVPATHMTU
:
1567 * We ignore this option for TCP
1569 * (RFC3542 leaves this case
1572 if (uproto
!= IPPROTO_TCP
)
1576 case IPV6_RECVTCLASS
:
1577 /* cannot mix with RFC2292 XXX */
1578 if (OPTBIT(IN6P_RFC2292
)) {
1582 OPTSET(IN6P_TCLASS
);
1585 case IPV6_AUTOFLOWLABEL
:
1586 OPTSET(IN6P_AUTOFLOWLABEL
);
1595 * make setsockopt(IPV6_V6ONLY)
1596 * available only prior to bind(2).
1598 if (in6p
->in6p_lport
||
1599 !IN6_IS_ADDR_UNSPECIFIED(&in6p
->in6p_laddr
))
1604 OPTSET(IN6P_IPV6_V6ONLY
);
1606 in6p
->in6p_vflag
&= ~INP_IPV4
;
1608 in6p
->in6p_vflag
|= INP_IPV4
;
1615 case IPV6_USE_MIN_MTU
:
1616 case IPV6_PREFER_TEMPADDR
:
1617 if (optlen
!= sizeof(optval
)) {
1621 error
= soopt_to_kbuf(sopt
, &optval
,
1622 sizeof optval
, sizeof optval
);
1626 struct ip6_pktopts
**optp
;
1627 optp
= &in6p
->in6p_outputopts
;
1628 error
= ip6_pcbopt(optname
,
1629 (u_char
*)&optval
, sizeof(optval
),
1634 case IPV6_2292PKTINFO
:
1635 case IPV6_2292HOPLIMIT
:
1636 case IPV6_2292HOPOPTS
:
1637 case IPV6_2292DSTOPTS
:
1638 case IPV6_2292RTHDR
:
1640 if (optlen
!= sizeof(int)) {
1644 error
= soopt_to_kbuf(sopt
, &optval
,
1645 sizeof optval
, sizeof optval
);
1649 case IPV6_2292PKTINFO
:
1650 OPTSET2292(IN6P_PKTINFO
);
1652 case IPV6_2292HOPLIMIT
:
1653 OPTSET2292(IN6P_HOPLIMIT
);
1655 case IPV6_2292HOPOPTS
:
1657 * Check super-user privilege.
1658 * See comments for IPV6_RECVHOPOPTS.
1662 OPTSET2292(IN6P_HOPOPTS
);
1664 case IPV6_2292DSTOPTS
:
1667 OPTSET2292(IN6P_DSTOPTS
|IN6P_RTHDRDSTOPTS
); /* XXX */
1669 case IPV6_2292RTHDR
:
1670 OPTSET2292(IN6P_RTHDR
);
1679 case IPV6_RTHDRDSTOPTS
:
1683 * New advanced API (RFC3542)
1686 u_char optbuf_storage
[MCLBYTES
];
1688 struct ip6_pktopts
**optp
;
1690 /* cannot mix with RFC2292 */
1691 if (OPTBIT(IN6P_RFC2292
)) {
1697 * We only ensure valsize is not too large
1698 * here. Further validation will be done
1701 error
= soopt_to_kbuf(sopt
, optbuf_storage
,
1702 sizeof(optbuf_storage
), 0);
1705 optlen
= sopt
->sopt_valsize
;
1706 optbuf
= optbuf_storage
;
1707 optp
= &in6p
->in6p_outputopts
;
1708 error
= ip6_pcbopt(optname
, optbuf
, optlen
,
1714 case IPV6_MULTICAST_IF
:
1715 case IPV6_MULTICAST_HOPS
:
1716 case IPV6_MULTICAST_LOOP
:
1717 case IPV6_JOIN_GROUP
:
1718 case IPV6_LEAVE_GROUP
:
1721 if (sopt
->sopt_valsize
> MLEN
) {
1726 MGET(m
, sopt
->sopt_td
? MB_WAIT
: MB_DONTWAIT
, MT_HEADER
);
1731 m
->m_len
= sopt
->sopt_valsize
;
1732 error
= soopt_to_kbuf(sopt
, mtod(m
, char *),
1733 m
->m_len
, m
->m_len
);
1734 error
= ip6_setmoptions(sopt
->sopt_name
,
1735 &in6p
->in6p_moptions
,
1741 case IPV6_PORTRANGE
:
1742 error
= soopt_to_kbuf(sopt
, &optval
,
1743 sizeof optval
, sizeof optval
);
1748 case IPV6_PORTRANGE_DEFAULT
:
1749 in6p
->in6p_flags
&= ~(IN6P_LOWPORT
);
1750 in6p
->in6p_flags
&= ~(IN6P_HIGHPORT
);
1753 case IPV6_PORTRANGE_HIGH
:
1754 in6p
->in6p_flags
&= ~(IN6P_LOWPORT
);
1755 in6p
->in6p_flags
|= IN6P_HIGHPORT
;
1758 case IPV6_PORTRANGE_LOW
:
1759 in6p
->in6p_flags
&= ~(IN6P_HIGHPORT
);
1760 in6p
->in6p_flags
|= IN6P_LOWPORT
;
1769 #if defined(IPSEC) || defined(FAST_IPSEC)
1770 case IPV6_IPSEC_POLICY
:
1776 if ((error
= soopt_getm(sopt
, &m
)) != 0) /* XXX */
1778 soopt_to_mbuf(sopt
, m
); /* XXX */
1780 req
= mtod(m
, caddr_t
);
1783 error
= ipsec6_set_policy(in6p
, optname
, req
,
1788 #endif /* KAME IPSEC */
1796 struct mbuf
**mp
= &m
;
1798 if (ip6_fw_ctl_ptr
== NULL
)
1801 if ((error
= soopt_getm(sopt
, &m
)) != 0)
1804 soopt_to_mbuf(sopt
, m
);
1805 error
= (*ip6_fw_ctl_ptr
)(optname
, mp
);
1811 error
= ENOPROTOOPT
;
1818 case IPV6_2292PKTOPTIONS
:
1819 #ifdef IPV6_PKTOPTIONS
1820 case IPV6_PKTOPTIONS
:
1823 * RFC3542 (effectively) deprecated the
1824 * semantics of the 2292-style pktoptions.
1825 * Since it was not reliable in nature (i.e.,
1826 * applications had to expect the lack of some
1827 * information after all), it would make sense
1828 * to simplify this part by always returning
1831 if (in6p
->in6p_options
) {
1833 m
= m_copym(in6p
->in6p_options
,
1834 0, M_COPYALL
, MB_WAIT
);
1835 error
= soopt_from_mbuf(sopt
, m
);
1839 sopt
->sopt_valsize
= 0;
1842 case IPV6_RECVHOPOPTS
:
1843 case IPV6_RECVDSTOPTS
:
1844 case IPV6_RECVRTHDRDSTOPTS
:
1845 case IPV6_UNICAST_HOPS
:
1846 case IPV6_RECVPKTINFO
:
1847 case IPV6_RECVHOPLIMIT
:
1848 case IPV6_RECVRTHDR
:
1849 case IPV6_RECVPATHMTU
:
1850 case IPV6_RECVTCLASS
:
1851 case IPV6_AUTOFLOWLABEL
:
1854 case IPV6_PORTRANGE
:
1857 case IPV6_RECVHOPOPTS
:
1858 optval
= OPTBIT(IN6P_HOPOPTS
);
1861 case IPV6_RECVDSTOPTS
:
1862 optval
= OPTBIT(IN6P_DSTOPTS
);
1865 case IPV6_RECVRTHDRDSTOPTS
:
1866 optval
= OPTBIT(IN6P_RTHDRDSTOPTS
);
1869 case IPV6_RECVPKTINFO
:
1870 optval
= OPTBIT(IN6P_PKTINFO
);
1873 case IPV6_RECVHOPLIMIT
:
1874 optval
= OPTBIT(IN6P_HOPLIMIT
);
1877 case IPV6_RECVRTHDR
:
1878 optval
= OPTBIT(IN6P_RTHDR
);
1881 case IPV6_RECVPATHMTU
:
1882 optval
= OPTBIT(IN6P_MTU
);
1885 case IPV6_RECVTCLASS
:
1886 optval
= OPTBIT(IN6P_TCLASS
);
1889 case IPV6_AUTOFLOWLABEL
:
1890 optval
= OPTBIT(IN6P_AUTOFLOWLABEL
);
1894 case IPV6_UNICAST_HOPS
:
1895 optval
= in6p
->in6p_hops
;
1899 optval
= OPTBIT(IN6P_FAITH
);
1903 optval
= OPTBIT(IN6P_IPV6_V6ONLY
);
1906 case IPV6_PORTRANGE
:
1909 flags
= in6p
->in6p_flags
;
1910 if (flags
& IN6P_HIGHPORT
)
1911 optval
= IPV6_PORTRANGE_HIGH
;
1912 else if (flags
& IN6P_LOWPORT
)
1913 optval
= IPV6_PORTRANGE_LOW
;
1919 soopt_from_kbuf(sopt
, &optval
,
1926 struct ip6_mtuinfo mtuinfo
;
1927 struct route_in6 sro
;
1929 bzero(&sro
, sizeof(sro
));
1931 if (!(so
->so_state
& SS_ISCONNECTED
))
1934 * XXX: we dot not consider the case of source
1935 * routing, or optional information to specify
1936 * the outgoing interface.
1938 error
= ip6_getpmtu(&sro
, NULL
, NULL
,
1939 &in6p
->in6p_faddr
, &pmtu
, NULL
);
1944 if (pmtu
> IPV6_MAXPACKET
)
1945 pmtu
= IPV6_MAXPACKET
;
1947 bzero(&mtuinfo
, sizeof(mtuinfo
));
1948 mtuinfo
.ip6m_mtu
= (u_int32_t
)pmtu
;
1949 optdata
= (void *)&mtuinfo
;
1950 optdatalen
= sizeof(mtuinfo
);
1951 soopt_from_kbuf(sopt
, optdata
,
1956 case IPV6_2292PKTINFO
:
1957 case IPV6_2292HOPLIMIT
:
1958 case IPV6_2292HOPOPTS
:
1959 case IPV6_2292RTHDR
:
1960 case IPV6_2292DSTOPTS
:
1961 if (optname
== IPV6_2292HOPOPTS
||
1962 optname
== IPV6_2292DSTOPTS
||
1966 case IPV6_2292PKTINFO
:
1967 optval
= OPTBIT(IN6P_PKTINFO
);
1969 case IPV6_2292HOPLIMIT
:
1970 optval
= OPTBIT(IN6P_HOPLIMIT
);
1972 case IPV6_2292HOPOPTS
:
1975 optval
= OPTBIT(IN6P_HOPOPTS
);
1977 case IPV6_2292RTHDR
:
1978 optval
= OPTBIT(IN6P_RTHDR
);
1980 case IPV6_2292DSTOPTS
:
1983 optval
= OPTBIT(IN6P_DSTOPTS
|IN6P_RTHDRDSTOPTS
);
1986 soopt_from_kbuf(sopt
, &optval
,
1994 case IPV6_RTHDRDSTOPTS
:
1998 case IPV6_USE_MIN_MTU
:
1999 case IPV6_PREFER_TEMPADDR
:
2000 error
= ip6_getpcbopt(in6p
->in6p_outputopts
,
2004 case IPV6_MULTICAST_IF
:
2005 case IPV6_MULTICAST_HOPS
:
2006 case IPV6_MULTICAST_LOOP
:
2007 case IPV6_JOIN_GROUP
:
2008 case IPV6_LEAVE_GROUP
:
2011 error
= ip6_getmoptions(sopt
->sopt_name
,
2012 in6p
->in6p_moptions
, &m
);
2014 soopt_from_kbuf(sopt
,
2015 mtod(m
, char *), m
->m_len
);
2020 #if defined(IPSEC) || defined(FAST_IPSEC)
2021 case IPV6_IPSEC_POLICY
:
2025 struct mbuf
*m
= NULL
;
2026 struct mbuf
**mp
= &m
;
2028 error
= soopt_getm(sopt
, &m
); /* XXX */
2031 soopt_to_mbuf(sopt
, m
); /* XXX */
2033 req
= mtod(m
, caddr_t
);
2036 error
= ipsec6_get_policy(in6p
, req
, len
, mp
);
2038 error
= soopt_from_mbuf(sopt
, m
); /*XXX*/
2039 if (error
== 0 && m
!= NULL
)
2043 #endif /* KAME IPSEC */
2048 struct mbuf
**mp
= &m
;
2050 if (ip6_fw_ctl_ptr
== NULL
)
2054 error
= (*ip6_fw_ctl_ptr
)(optname
, mp
);
2056 error
= soopt_from_mbuf(sopt
, m
); /* XXX */
2057 if (error
== 0 && m
!= NULL
)
2063 error
= ENOPROTOOPT
;
2075 ip6_raw_ctloutput(struct socket
*so
, struct sockopt
*sopt
)
2077 int error
= 0, optval
, optlen
;
2078 const int icmp6off
= offsetof(struct icmp6_hdr
, icmp6_cksum
);
2079 struct in6pcb
*in6p
= sotoin6pcb(so
);
2080 int level
, op
, optname
;
2083 level
= sopt
->sopt_level
;
2084 op
= sopt
->sopt_dir
;
2085 optname
= sopt
->sopt_name
;
2086 optlen
= sopt
->sopt_valsize
;
2088 panic("ip6_raw_ctloutput: arg soopt is NULL");
2090 if (level
!= IPPROTO_IPV6
) {
2097 * For ICMPv6 sockets, no modification allowed for checksum
2098 * offset, permit "no change" values to help existing apps.
2100 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2101 * for an ICMPv6 socket will fail."
2102 * The current behavior does not meet RFC3542.
2106 if (optlen
!= sizeof(int)) {
2110 error
= soopt_to_kbuf(sopt
, &optval
,
2111 sizeof optval
, sizeof optval
);
2114 if ((optval
% 2) != 0) {
2115 /* the API assumes even offset values */
2117 } else if (so
->so_proto
->pr_protocol
==
2119 if (optval
!= icmp6off
)
2122 in6p
->in6p_cksum
= optval
;
2126 if (so
->so_proto
->pr_protocol
== IPPROTO_ICMPV6
)
2129 optval
= in6p
->in6p_cksum
;
2131 soopt_from_kbuf(sopt
, &optval
, sizeof(optval
));
2141 error
= ENOPROTOOPT
;
2149 * Set up IP6 options in pcb for insertion in output packets or
2150 * specifying behavior of outgoing packets.
2153 ip6_pcbopts(struct ip6_pktopts
**pktopt
, struct mbuf
*m
,
2154 struct socket
*so
, struct sockopt
*sopt
)
2157 struct ip6_pktopts
*opt
= *pktopt
;
2160 /* turn off any old options. */
2163 if (opt
->ip6po_pktinfo
|| opt
->ip6po_nexthop
||
2164 opt
->ip6po_hbh
|| opt
->ip6po_dest1
|| opt
->ip6po_dest2
||
2165 opt
->ip6po_rhinfo
.ip6po_rhi_rthdr
)
2166 kprintf("ip6_pcbopts: all specified options are cleared.\n");
2168 ip6_clearpktopts(opt
, -1);
2170 opt
= kmalloc(sizeof(*opt
), M_IP6OPT
, M_WAITOK
);
2173 if (!m
|| m
->m_len
== 0) {
2175 * Only turning off any previous options, regardless of
2176 * whether the opt is just created or given.
2178 kfree(opt
, M_IP6OPT
);
2182 /* set options specified by user. */
2183 if ((error
= ip6_setpktoptions(m
, opt
, NULL
, so
->so_proto
->pr_protocol
, priv
)) != 0) {
2184 ip6_clearpktopts(opt
, -1); /* XXX: discard all options */
2185 kfree(opt
, M_IP6OPT
);
2194 * Below three functions are introduced by merge to RFC3542
2198 ip6_getpcbopt(struct ip6_pktopts
*pktopt
, int optname
, struct sockopt
*sopt
)
2200 void *optdata
= NULL
;
2202 struct ip6_ext
*ip6e
;
2204 struct in6_pktinfo null_pktinfo
;
2205 int deftclass
= 0, on
;
2206 int defminmtu
= IP6PO_MINMTU_MCASTONLY
;
2207 int defpreftemp
= IP6PO_TEMPADDR_SYSTEM
;
2211 if (pktopt
&& pktopt
->ip6po_pktinfo
)
2212 optdata
= (void *)pktopt
->ip6po_pktinfo
;
2214 /* XXX: we don't have to do this every time... */
2215 bzero(&null_pktinfo
, sizeof(null_pktinfo
));
2216 optdata
= (void *)&null_pktinfo
;
2218 optdatalen
= sizeof(struct in6_pktinfo
);
2221 if (pktopt
&& pktopt
->ip6po_tclass
>= 0)
2222 optdata
= (void *)&pktopt
->ip6po_tclass
;
2224 optdata
= (void *)&deftclass
;
2225 optdatalen
= sizeof(int);
2228 if (pktopt
&& pktopt
->ip6po_hbh
) {
2229 optdata
= (void *)pktopt
->ip6po_hbh
;
2230 ip6e
= (struct ip6_ext
*)pktopt
->ip6po_hbh
;
2231 optdatalen
= (ip6e
->ip6e_len
+ 1) << 3;
2235 if (pktopt
&& pktopt
->ip6po_rthdr
) {
2236 optdata
= (void *)pktopt
->ip6po_rthdr
;
2237 ip6e
= (struct ip6_ext
*)pktopt
->ip6po_rthdr
;
2238 optdatalen
= (ip6e
->ip6e_len
+ 1) << 3;
2241 case IPV6_RTHDRDSTOPTS
:
2242 if (pktopt
&& pktopt
->ip6po_dest1
) {
2243 optdata
= (void *)pktopt
->ip6po_dest1
;
2244 ip6e
= (struct ip6_ext
*)pktopt
->ip6po_dest1
;
2245 optdatalen
= (ip6e
->ip6e_len
+ 1) << 3;
2249 if (pktopt
&& pktopt
->ip6po_dest2
) {
2250 optdata
= (void *)pktopt
->ip6po_dest2
;
2251 ip6e
= (struct ip6_ext
*)pktopt
->ip6po_dest2
;
2252 optdatalen
= (ip6e
->ip6e_len
+ 1) << 3;
2256 if (pktopt
&& pktopt
->ip6po_nexthop
) {
2257 optdata
= (void *)pktopt
->ip6po_nexthop
;
2258 optdatalen
= pktopt
->ip6po_nexthop
->sa_len
;
2261 case IPV6_USE_MIN_MTU
:
2263 optdata
= (void *)&pktopt
->ip6po_minmtu
;
2265 optdata
= (void *)&defminmtu
;
2266 optdatalen
= sizeof(int);
2269 if (pktopt
&& ((pktopt
->ip6po_flags
) & IP6PO_DONTFRAG
))
2273 optdata
= (void *)&on
;
2274 optdatalen
= sizeof(on
);
2276 case IPV6_PREFER_TEMPADDR
:
2278 optdata
= (void *)&pktopt
->ip6po_prefer_tempaddr
;
2280 optdata
= (void *)&defpreftemp
;
2281 optdatalen
= sizeof(int);
2283 default: /* should not happen */
2285 panic("ip6_getpcbopt: unexpected option\n");
2287 return (ENOPROTOOPT
);
2290 soopt_from_kbuf(sopt
, optdata
, optdatalen
);
2296 * initialize ip6_pktopts. beware that there are non-zero default values in
2301 ip6_pcbopt(int optname
, u_char
*buf
, int len
, struct ip6_pktopts
**pktopt
, int uproto
)
2303 struct ip6_pktopts
*opt
;
2305 if (*pktopt
== NULL
) {
2306 *pktopt
= kmalloc(sizeof(*opt
), M_IP6OPT
, M_WAITOK
);
2307 init_ip6pktopts(*pktopt
);
2311 return (ip6_setpktoption(optname
, buf
, len
, opt
, 1, 0, uproto
, priv
));
2315 * initialize ip6_pktopts. beware that there are non-zero default values in
2319 init_ip6pktopts(struct ip6_pktopts
*opt
)
2322 bzero(opt
, sizeof(*opt
));
2323 opt
->ip6po_hlim
= -1; /* -1 means default hop limit */
2324 opt
->ip6po_tclass
= -1; /* -1 means default traffic class */
2325 opt
->ip6po_minmtu
= IP6PO_MINMTU_MCASTONLY
;
2326 opt
->ip6po_prefer_tempaddr
= IP6PO_TEMPADDR_SYSTEM
;
2330 ip6_clearpktopts(struct ip6_pktopts
*pktopt
, int optname
)
2335 if (optname
== -1 || optname
== IPV6_PKTINFO
) {
2336 if (pktopt
->ip6po_pktinfo
)
2337 kfree(pktopt
->ip6po_pktinfo
, M_IP6OPT
);
2338 pktopt
->ip6po_pktinfo
= NULL
;
2340 if (optname
== -1 || optname
== IPV6_HOPLIMIT
)
2341 pktopt
->ip6po_hlim
= -1;
2342 if (optname
== -1 || optname
== IPV6_TCLASS
)
2343 pktopt
->ip6po_tclass
= -1;
2344 if (optname
== -1 || optname
== IPV6_NEXTHOP
) {
2345 if (pktopt
->ip6po_nextroute
.ro_rt
) {
2346 RTFREE(pktopt
->ip6po_nextroute
.ro_rt
);
2347 pktopt
->ip6po_nextroute
.ro_rt
= NULL
;
2349 if (pktopt
->ip6po_nexthop
)
2350 kfree(pktopt
->ip6po_nexthop
, M_IP6OPT
);
2351 pktopt
->ip6po_nexthop
= NULL
;
2353 if (optname
== -1 || optname
== IPV6_HOPOPTS
) {
2354 if (pktopt
->ip6po_hbh
)
2355 kfree(pktopt
->ip6po_hbh
, M_IP6OPT
);
2356 pktopt
->ip6po_hbh
= NULL
;
2358 if (optname
== -1 || optname
== IPV6_RTHDRDSTOPTS
) {
2359 if (pktopt
->ip6po_dest1
)
2360 kfree(pktopt
->ip6po_dest1
, M_IP6OPT
);
2361 pktopt
->ip6po_dest1
= NULL
;
2363 if (optname
== -1 || optname
== IPV6_RTHDR
) {
2364 if (pktopt
->ip6po_rhinfo
.ip6po_rhi_rthdr
)
2365 kfree(pktopt
->ip6po_rhinfo
.ip6po_rhi_rthdr
, M_IP6OPT
);
2366 pktopt
->ip6po_rhinfo
.ip6po_rhi_rthdr
= NULL
;
2367 if (pktopt
->ip6po_route
.ro_rt
) {
2368 RTFREE(pktopt
->ip6po_route
.ro_rt
);
2369 pktopt
->ip6po_route
.ro_rt
= NULL
;
2372 if (optname
== -1 || optname
== IPV6_DSTOPTS
) {
2373 if (pktopt
->ip6po_dest2
)
2374 kfree(pktopt
->ip6po_dest2
, M_IP6OPT
);
2375 pktopt
->ip6po_dest2
= NULL
;
2379 #define PKTOPT_EXTHDRCPY(type) \
2383 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2384 dst->type = kmalloc(hlen, M_IP6OPT, canwait);\
2385 if (dst->type == NULL)\
2387 bcopy(src->type, dst->type, hlen);\
2391 struct ip6_pktopts
*
2392 ip6_copypktopts(struct ip6_pktopts
*src
, int canwait
)
2394 struct ip6_pktopts
*dst
;
2397 kprintf("ip6_clearpktopts: invalid argument\n");
2401 dst
= kmalloc(sizeof(*dst
), M_IP6OPT
, canwait
| M_ZERO
);
2405 dst
->ip6po_hlim
= src
->ip6po_hlim
;
2406 if (src
->ip6po_pktinfo
) {
2407 dst
->ip6po_pktinfo
= kmalloc(sizeof(*dst
->ip6po_pktinfo
),
2409 if (dst
->ip6po_pktinfo
== NULL
)
2411 *dst
->ip6po_pktinfo
= *src
->ip6po_pktinfo
;
2413 if (src
->ip6po_nexthop
) {
2414 dst
->ip6po_nexthop
= kmalloc(src
->ip6po_nexthop
->sa_len
,
2416 if (dst
->ip6po_nexthop
== NULL
)
2418 bcopy(src
->ip6po_nexthop
, dst
->ip6po_nexthop
,
2419 src
->ip6po_nexthop
->sa_len
);
2421 PKTOPT_EXTHDRCPY(ip6po_hbh
);
2422 PKTOPT_EXTHDRCPY(ip6po_dest1
);
2423 PKTOPT_EXTHDRCPY(ip6po_dest2
);
2424 PKTOPT_EXTHDRCPY(ip6po_rthdr
); /* not copy the cached route */
2428 if (dst
->ip6po_pktinfo
) kfree(dst
->ip6po_pktinfo
, M_IP6OPT
);
2429 if (dst
->ip6po_nexthop
) kfree(dst
->ip6po_nexthop
, M_IP6OPT
);
2430 if (dst
->ip6po_hbh
) kfree(dst
->ip6po_hbh
, M_IP6OPT
);
2431 if (dst
->ip6po_dest1
) kfree(dst
->ip6po_dest1
, M_IP6OPT
);
2432 if (dst
->ip6po_dest2
) kfree(dst
->ip6po_dest2
, M_IP6OPT
);
2433 if (dst
->ip6po_rthdr
) kfree(dst
->ip6po_rthdr
, M_IP6OPT
);
2434 kfree(dst
, M_IP6OPT
);
2439 copypktopts(struct ip6_pktopts
*dst
, struct ip6_pktopts
*src
, int canwait
)
2441 if (dst
== NULL
|| src
== NULL
) {
2443 kprintf("ip6_clearpktopts: invalid argument\n");
2448 dst
->ip6po_hlim
= src
->ip6po_hlim
;
2449 dst
->ip6po_tclass
= src
->ip6po_tclass
;
2450 dst
->ip6po_flags
= src
->ip6po_flags
;
2451 if (src
->ip6po_pktinfo
) {
2452 dst
->ip6po_pktinfo
= kmalloc(sizeof(*dst
->ip6po_pktinfo
),
2454 if (dst
->ip6po_pktinfo
== NULL
)
2456 *dst
->ip6po_pktinfo
= *src
->ip6po_pktinfo
;
2458 if (src
->ip6po_nexthop
) {
2459 dst
->ip6po_nexthop
= kmalloc(src
->ip6po_nexthop
->sa_len
,
2461 if (dst
->ip6po_nexthop
== NULL
)
2463 bcopy(src
->ip6po_nexthop
, dst
->ip6po_nexthop
,
2464 src
->ip6po_nexthop
->sa_len
);
2466 PKTOPT_EXTHDRCPY(ip6po_hbh
);
2467 PKTOPT_EXTHDRCPY(ip6po_dest1
);
2468 PKTOPT_EXTHDRCPY(ip6po_dest2
);
2469 PKTOPT_EXTHDRCPY(ip6po_rthdr
); /* not copy the cached route */
2473 ip6_clearpktopts(dst
, -1);
2476 #undef PKTOPT_EXTHDRCPY
2479 ip6_freepcbopts(struct ip6_pktopts
*pktopt
)
2484 ip6_clearpktopts(pktopt
, -1);
2486 kfree(pktopt
, M_IP6OPT
);
2490 * Set the IP6 multicast options in response to user setsockopt().
2493 ip6_setmoptions(int optname
, struct ip6_moptions
**im6op
, struct mbuf
*m
)
2496 u_int loop
, ifindex
;
2497 struct ipv6_mreq
*mreq
;
2499 struct ip6_moptions
*im6o
= *im6op
;
2500 struct route_in6 ro
;
2501 struct sockaddr_in6
*dst
;
2502 struct in6_multi_mship
*imm
;
2503 struct thread
*td
= curthread
; /* XXX */
2507 * No multicast option buffer attached to the pcb;
2508 * allocate one and initialize to default values.
2510 im6o
= (struct ip6_moptions
*)
2511 kmalloc(sizeof(*im6o
), M_IPMOPTS
, M_WAITOK
);
2514 im6o
->im6o_multicast_ifp
= NULL
;
2515 im6o
->im6o_multicast_hlim
= ip6_defmcasthlim
;
2516 im6o
->im6o_multicast_loop
= IPV6_DEFAULT_MULTICAST_LOOP
;
2517 LIST_INIT(&im6o
->im6o_memberships
);
2522 case IPV6_MULTICAST_IF
:
2524 * Select the interface for outgoing multicast packets.
2526 if (m
== NULL
|| m
->m_len
!= sizeof(u_int
)) {
2530 bcopy(mtod(m
, u_int
*), &ifindex
, sizeof(ifindex
));
2531 if (ifindex
< 0 || if_index
< ifindex
) {
2532 error
= ENXIO
; /* XXX EINVAL? */
2535 ifp
= ifindex2ifnet
[ifindex
];
2536 if (ifp
== NULL
|| !(ifp
->if_flags
& IFF_MULTICAST
)) {
2537 error
= EADDRNOTAVAIL
;
2540 im6o
->im6o_multicast_ifp
= ifp
;
2543 case IPV6_MULTICAST_HOPS
:
2546 * Set the IP6 hoplimit for outgoing multicast packets.
2549 if (m
== NULL
|| m
->m_len
!= sizeof(int)) {
2553 bcopy(mtod(m
, u_int
*), &optval
, sizeof(optval
));
2554 if (optval
< -1 || optval
>= 256)
2556 else if (optval
== -1)
2557 im6o
->im6o_multicast_hlim
= ip6_defmcasthlim
;
2559 im6o
->im6o_multicast_hlim
= optval
;
2563 case IPV6_MULTICAST_LOOP
:
2565 * Set the loopback flag for outgoing multicast packets.
2566 * Must be zero or one.
2568 if (m
== NULL
|| m
->m_len
!= sizeof(u_int
)) {
2572 bcopy(mtod(m
, u_int
*), &loop
, sizeof(loop
));
2577 im6o
->im6o_multicast_loop
= loop
;
2580 case IPV6_JOIN_GROUP
:
2582 * Add a multicast group membership.
2583 * Group must be a valid IP6 multicast address.
2585 if (m
== NULL
|| m
->m_len
!= sizeof(struct ipv6_mreq
)) {
2589 mreq
= mtod(m
, struct ipv6_mreq
*);
2590 if (IN6_IS_ADDR_UNSPECIFIED(&mreq
->ipv6mr_multiaddr
)) {
2592 * We use the unspecified address to specify to accept
2593 * all multicast addresses. Only super user is allowed
2596 if (priv_check(td
, PRIV_ROOT
))
2601 } else if (!IN6_IS_ADDR_MULTICAST(&mreq
->ipv6mr_multiaddr
)) {
2607 * If the interface is specified, validate it.
2609 if (mreq
->ipv6mr_interface
< 0
2610 || if_index
< mreq
->ipv6mr_interface
) {
2611 error
= ENXIO
; /* XXX EINVAL? */
2615 * If no interface was explicitly specified, choose an
2616 * appropriate one according to the given multicast address.
2618 if (mreq
->ipv6mr_interface
== 0) {
2620 * If the multicast address is in node-local scope,
2621 * the interface should be a loopback interface.
2622 * Otherwise, look up the routing table for the
2623 * address, and choose the outgoing interface.
2624 * XXX: is it a good approach?
2626 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq
->ipv6mr_multiaddr
)) {
2630 dst
= (struct sockaddr_in6
*)&ro
.ro_dst
;
2631 bzero(dst
, sizeof(*dst
));
2632 dst
->sin6_len
= sizeof(struct sockaddr_in6
);
2633 dst
->sin6_family
= AF_INET6
;
2634 dst
->sin6_addr
= mreq
->ipv6mr_multiaddr
;
2635 rtalloc((struct route
*)&ro
);
2636 if (ro
.ro_rt
== NULL
) {
2637 error
= EADDRNOTAVAIL
;
2640 ifp
= ro
.ro_rt
->rt_ifp
;
2644 ifp
= ifindex2ifnet
[mreq
->ipv6mr_interface
];
2647 * See if we found an interface, and confirm that it
2648 * supports multicast
2650 if (ifp
== NULL
|| !(ifp
->if_flags
& IFF_MULTICAST
)) {
2651 error
= EADDRNOTAVAIL
;
2655 * Put interface index into the multicast address,
2656 * if the address has link-local scope.
2658 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq
->ipv6mr_multiaddr
)) {
2659 mreq
->ipv6mr_multiaddr
.s6_addr16
[1]
2660 = htons(mreq
->ipv6mr_interface
);
2663 * See if the membership already exists.
2665 for (imm
= im6o
->im6o_memberships
.lh_first
;
2666 imm
!= NULL
; imm
= imm
->i6mm_chain
.le_next
)
2667 if (imm
->i6mm_maddr
->in6m_ifp
== ifp
&&
2668 IN6_ARE_ADDR_EQUAL(&imm
->i6mm_maddr
->in6m_addr
,
2669 &mreq
->ipv6mr_multiaddr
))
2676 * Everything looks good; add a new record to the multicast
2677 * address list for the given interface.
2679 imm
= kmalloc(sizeof(*imm
), M_IPMADDR
, M_WAITOK
);
2680 if ((imm
->i6mm_maddr
=
2681 in6_addmulti(&mreq
->ipv6mr_multiaddr
, ifp
, &error
)) == NULL
) {
2682 kfree(imm
, M_IPMADDR
);
2685 LIST_INSERT_HEAD(&im6o
->im6o_memberships
, imm
, i6mm_chain
);
2688 case IPV6_LEAVE_GROUP
:
2690 * Drop a multicast group membership.
2691 * Group must be a valid IP6 multicast address.
2693 if (m
== NULL
|| m
->m_len
!= sizeof(struct ipv6_mreq
)) {
2697 mreq
= mtod(m
, struct ipv6_mreq
*);
2698 if (IN6_IS_ADDR_UNSPECIFIED(&mreq
->ipv6mr_multiaddr
)) {
2699 if (priv_check(td
, PRIV_ROOT
)) {
2703 } else if (!IN6_IS_ADDR_MULTICAST(&mreq
->ipv6mr_multiaddr
)) {
2708 * If an interface address was specified, get a pointer
2709 * to its ifnet structure.
2711 if (mreq
->ipv6mr_interface
< 0
2712 || if_index
< mreq
->ipv6mr_interface
) {
2713 error
= ENXIO
; /* XXX EINVAL? */
2716 ifp
= ifindex2ifnet
[mreq
->ipv6mr_interface
];
2718 * Put interface index into the multicast address,
2719 * if the address has link-local scope.
2721 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq
->ipv6mr_multiaddr
)) {
2722 mreq
->ipv6mr_multiaddr
.s6_addr16
[1]
2723 = htons(mreq
->ipv6mr_interface
);
2726 * Find the membership in the membership list.
2728 for (imm
= im6o
->im6o_memberships
.lh_first
;
2729 imm
!= NULL
; imm
= imm
->i6mm_chain
.le_next
) {
2731 imm
->i6mm_maddr
->in6m_ifp
== ifp
) &&
2732 IN6_ARE_ADDR_EQUAL(&imm
->i6mm_maddr
->in6m_addr
,
2733 &mreq
->ipv6mr_multiaddr
))
2737 /* Unable to resolve interface */
2738 error
= EADDRNOTAVAIL
;
2742 * Give up the multicast address record to which the
2743 * membership points.
2745 LIST_REMOVE(imm
, i6mm_chain
);
2746 in6_delmulti(imm
->i6mm_maddr
);
2747 kfree(imm
, M_IPMADDR
);
2756 * If all options have default values, no need to keep the mbuf.
2758 if (im6o
->im6o_multicast_ifp
== NULL
&&
2759 im6o
->im6o_multicast_hlim
== ip6_defmcasthlim
&&
2760 im6o
->im6o_multicast_loop
== IPV6_DEFAULT_MULTICAST_LOOP
&&
2761 im6o
->im6o_memberships
.lh_first
== NULL
) {
2762 kfree(*im6op
, M_IPMOPTS
);
2770 * Return the IP6 multicast options in response to user getsockopt().
2773 ip6_getmoptions(int optname
, struct ip6_moptions
*im6o
, struct mbuf
**mp
)
2775 u_int
*hlim
, *loop
, *ifindex
;
2777 *mp
= m_get(MB_WAIT
, MT_HEADER
); /* XXX */
2781 case IPV6_MULTICAST_IF
:
2782 ifindex
= mtod(*mp
, u_int
*);
2783 (*mp
)->m_len
= sizeof(u_int
);
2784 if (im6o
== NULL
|| im6o
->im6o_multicast_ifp
== NULL
)
2787 *ifindex
= im6o
->im6o_multicast_ifp
->if_index
;
2790 case IPV6_MULTICAST_HOPS
:
2791 hlim
= mtod(*mp
, u_int
*);
2792 (*mp
)->m_len
= sizeof(u_int
);
2794 *hlim
= ip6_defmcasthlim
;
2796 *hlim
= im6o
->im6o_multicast_hlim
;
2799 case IPV6_MULTICAST_LOOP
:
2800 loop
= mtod(*mp
, u_int
*);
2801 (*mp
)->m_len
= sizeof(u_int
);
2803 *loop
= ip6_defmcasthlim
;
2805 *loop
= im6o
->im6o_multicast_loop
;
2809 return (EOPNOTSUPP
);
2814 * Discard the IP6 multicast options.
2817 ip6_freemoptions(struct ip6_moptions
*im6o
)
2819 struct in6_multi_mship
*imm
;
2824 while ((imm
= im6o
->im6o_memberships
.lh_first
) != NULL
) {
2825 LIST_REMOVE(imm
, i6mm_chain
);
2826 if (imm
->i6mm_maddr
)
2827 in6_delmulti(imm
->i6mm_maddr
);
2828 kfree(imm
, M_IPMADDR
);
2830 kfree(im6o
, M_IPMOPTS
);
2834 * Set a particular packet option, as a sticky option or an ancillary data
2835 * item. "len" can be 0 only when it's a sticky option.
2836 * We have 4 cases of combination of "sticky" and "cmsg":
2837 * "sticky=0, cmsg=0": impossible
2838 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2839 * "sticky=1, cmsg=0": RFC3542 socket option
2840 * "sticky=1, cmsg=1": RFC2292 socket option
2843 ip6_setpktoption(int optname
, u_char
*buf
, int len
, struct ip6_pktopts
*opt
,
2844 int sticky
, int cmsg
, int uproto
, int priv
)
2846 int minmtupolicy
, preftemp
;
2849 if (!sticky
&& !cmsg
) {
2850 kprintf("ip6_setpktoption: impossible case\n");
2855 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2856 * not be specified in the context of RFC3542. Conversely,
2857 * RFC3542 types should not be specified in the context of RFC2292.
2861 case IPV6_2292PKTINFO
:
2862 case IPV6_2292HOPLIMIT
:
2863 case IPV6_2292NEXTHOP
:
2864 case IPV6_2292HOPOPTS
:
2865 case IPV6_2292DSTOPTS
:
2866 case IPV6_2292RTHDR
:
2867 case IPV6_2292PKTOPTIONS
:
2868 return (ENOPROTOOPT
);
2871 if (sticky
&& cmsg
) {
2878 case IPV6_RTHDRDSTOPTS
:
2880 case IPV6_USE_MIN_MTU
:
2883 case IPV6_PREFER_TEMPADDR
: /* XXX: not an RFC3542 option */
2884 return (ENOPROTOOPT
);
2889 case IPV6_2292PKTINFO
:
2892 struct in6_pktinfo
*pktinfo
;
2893 if (len
!= sizeof(struct in6_pktinfo
))
2895 pktinfo
= (struct in6_pktinfo
*)buf
;
2898 * An application can clear any sticky IPV6_PKTINFO option by
2899 * doing a "regular" setsockopt with ipi6_addr being
2900 * in6addr_any and ipi6_ifindex being zero.
2901 * [RFC 3542, Section 6]
2903 if (optname
== IPV6_PKTINFO
&& opt
->ip6po_pktinfo
&&
2904 pktinfo
->ipi6_ifindex
== 0 &&
2905 IN6_IS_ADDR_UNSPECIFIED(&pktinfo
->ipi6_addr
)) {
2906 ip6_clearpktopts(opt
, optname
);
2910 if (uproto
== IPPROTO_TCP
&& optname
== IPV6_PKTINFO
&&
2911 sticky
&& !IN6_IS_ADDR_UNSPECIFIED(&pktinfo
->ipi6_addr
)) {
2915 /* validate the interface index if specified. */
2916 if (pktinfo
->ipi6_ifindex
> if_index
||
2917 pktinfo
->ipi6_ifindex
< 0) {
2921 * Check if the requested source address is indeed a
2922 * unicast address assigned to the node, and can be
2923 * used as the packet's source address.
2925 if (opt
->ip6po_pktinfo
!= NULL
&&
2926 !IN6_IS_ADDR_UNSPECIFIED(&opt
->ip6po_pktinfo
->ipi6_addr
)) {
2927 struct in6_ifaddr
*ia6
;
2928 struct sockaddr_in6 sin6
;
2930 bzero(&sin6
, sizeof(sin6
));
2931 sin6
.sin6_len
= sizeof(sin6
);
2932 sin6
.sin6_family
= AF_INET6
;
2934 opt
->ip6po_pktinfo
->ipi6_addr
;
2935 ia6
= (struct in6_ifaddr
*)ifa_ifwithaddr(sin6tosa(&sin6
));
2937 (ia6
->ia6_flags
& (IN6_IFF_ANYCAST
|
2938 IN6_IFF_NOTREADY
)) != 0)
2939 return (EADDRNOTAVAIL
);
2943 * We store the address anyway, and let in6_selectsrc()
2944 * validate the specified address. This is because ipi6_addr
2945 * may not have enough information about its scope zone, and
2946 * we may need additional information (such as outgoing
2947 * interface or the scope zone of a destination address) to
2948 * disambiguate the scope.
2949 * XXX: the delay of the validation may confuse the
2950 * application when it is used as a sticky option.
2952 if (opt
->ip6po_pktinfo
== NULL
) {
2953 opt
->ip6po_pktinfo
= kmalloc(sizeof(*pktinfo
),
2954 M_IP6OPT
, M_NOWAIT
);
2955 if (opt
->ip6po_pktinfo
== NULL
)
2958 bcopy(pktinfo
, opt
->ip6po_pktinfo
, sizeof(*pktinfo
));
2962 case IPV6_2292HOPLIMIT
:
2968 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2969 * to simplify the ordering among hoplimit options.
2971 if (optname
== IPV6_HOPLIMIT
&& sticky
)
2972 return (ENOPROTOOPT
);
2974 if (len
!= sizeof(int))
2977 if (*hlimp
< -1 || *hlimp
> 255)
2980 opt
->ip6po_hlim
= *hlimp
;
2988 if (len
!= sizeof(int))
2990 tclass
= *(int *)buf
;
2991 if (tclass
< -1 || tclass
> 255)
2994 opt
->ip6po_tclass
= tclass
;
2998 case IPV6_2292NEXTHOP
:
3003 if (len
== 0) { /* just remove the option */
3004 ip6_clearpktopts(opt
, IPV6_NEXTHOP
);
3008 /* check if cmsg_len is large enough for sa_len */
3009 if (len
< sizeof(struct sockaddr
) || len
< *buf
)
3012 switch (((struct sockaddr
*)buf
)->sa_family
) {
3015 struct sockaddr_in6
*sa6
= (struct sockaddr_in6
*)buf
;
3018 if (sa6
->sin6_len
!= sizeof(struct sockaddr_in6
))
3021 if (IN6_IS_ADDR_UNSPECIFIED(&sa6
->sin6_addr
) ||
3022 IN6_IS_ADDR_MULTICAST(&sa6
->sin6_addr
)) {
3027 case AF_LINK
: /* should eventually be supported */
3029 return (EAFNOSUPPORT
);
3032 /* turn off the previous option, then set the new option. */
3033 ip6_clearpktopts(opt
, IPV6_NEXTHOP
);
3034 opt
->ip6po_nexthop
= kmalloc(*buf
, M_IP6OPT
, M_NOWAIT
);
3035 if (opt
->ip6po_nexthop
== NULL
)
3037 bcopy(buf
, opt
->ip6po_nexthop
, *buf
);
3040 case IPV6_2292HOPOPTS
:
3043 struct ip6_hbh
*hbh
;
3047 * XXX: We don't allow a non-privileged user to set ANY HbH
3048 * options, since per-option restriction has too much
3054 ip6_clearpktopts(opt
, IPV6_HOPOPTS
);
3055 break; /* just remove the option */
3058 /* message length validation */
3059 if (len
< sizeof(struct ip6_hbh
))
3061 hbh
= (struct ip6_hbh
*)buf
;
3062 hbhlen
= (hbh
->ip6h_len
+ 1) << 3;
3066 /* turn off the previous option, then set the new option. */
3067 ip6_clearpktopts(opt
, IPV6_HOPOPTS
);
3068 opt
->ip6po_hbh
= kmalloc(hbhlen
, M_IP6OPT
, M_NOWAIT
);
3069 if (opt
->ip6po_hbh
== NULL
)
3071 bcopy(hbh
, opt
->ip6po_hbh
, hbhlen
);
3076 case IPV6_2292DSTOPTS
:
3078 case IPV6_RTHDRDSTOPTS
:
3080 struct ip6_dest
*dest
, **newdest
= NULL
;
3086 ip6_clearpktopts(opt
, optname
);
3087 break; /* just remove the option */
3090 /* message length validation */
3091 if (len
< sizeof(struct ip6_dest
))
3093 dest
= (struct ip6_dest
*)buf
;
3094 destlen
= (dest
->ip6d_len
+ 1) << 3;
3099 * Determine the position that the destination options header
3100 * should be inserted; before or after the routing header.
3103 case IPV6_2292DSTOPTS
:
3105 * The old advacned API is ambiguous on this point.
3106 * Our approach is to determine the position based
3107 * according to the existence of a routing header.
3108 * Note, however, that this depends on the order of the
3109 * extension headers in the ancillary data; the 1st
3110 * part of the destination options header must appear
3111 * before the routing header in the ancillary data,
3113 * RFC3542 solved the ambiguity by introducing
3114 * separate ancillary data or option types.
3116 if (opt
->ip6po_rthdr
== NULL
)
3117 newdest
= &opt
->ip6po_dest1
;
3119 newdest
= &opt
->ip6po_dest2
;
3121 case IPV6_RTHDRDSTOPTS
:
3122 newdest
= &opt
->ip6po_dest1
;
3125 newdest
= &opt
->ip6po_dest2
;
3129 /* turn off the previous option, then set the new option. */
3130 ip6_clearpktopts(opt
, optname
);
3131 *newdest
= kmalloc(destlen
, M_IP6OPT
, M_NOWAIT
);
3132 if (*newdest
== NULL
)
3134 bcopy(dest
, *newdest
, destlen
);
3139 case IPV6_2292RTHDR
:
3142 struct ip6_rthdr
*rth
;
3146 ip6_clearpktopts(opt
, IPV6_RTHDR
);
3147 break; /* just remove the option */
3150 /* message length validation */
3151 if (len
< sizeof(struct ip6_rthdr
))
3153 rth
= (struct ip6_rthdr
*)buf
;
3154 rthlen
= (rth
->ip6r_len
+ 1) << 3;
3158 switch (rth
->ip6r_type
) {
3160 return (EINVAL
); /* not supported */
3163 /* turn off the previous option */
3164 ip6_clearpktopts(opt
, IPV6_RTHDR
);
3165 opt
->ip6po_rthdr
= kmalloc(rthlen
, M_IP6OPT
, M_NOWAIT
);
3166 if (opt
->ip6po_rthdr
== NULL
)
3168 bcopy(rth
, opt
->ip6po_rthdr
, rthlen
);
3173 case IPV6_USE_MIN_MTU
:
3174 if (len
!= sizeof(int))
3176 minmtupolicy
= *(int *)buf
;
3177 if (minmtupolicy
!= IP6PO_MINMTU_MCASTONLY
&&
3178 minmtupolicy
!= IP6PO_MINMTU_DISABLE
&&
3179 minmtupolicy
!= IP6PO_MINMTU_ALL
) {
3182 opt
->ip6po_minmtu
= minmtupolicy
;
3186 if (len
!= sizeof(int))
3189 if (uproto
== IPPROTO_TCP
|| *(int *)buf
== 0) {
3191 * we ignore this option for TCP sockets.
3192 * (RFC3542 leaves this case unspecified.)
3194 opt
->ip6po_flags
&= ~IP6PO_DONTFRAG
;
3196 opt
->ip6po_flags
|= IP6PO_DONTFRAG
;
3199 case IPV6_PREFER_TEMPADDR
:
3200 if (len
!= sizeof(int))
3202 preftemp
= *(int *)buf
;
3203 if (preftemp
!= IP6PO_TEMPADDR_SYSTEM
&&
3204 preftemp
!= IP6PO_TEMPADDR_NOTPREFER
&&
3205 preftemp
!= IP6PO_TEMPADDR_PREFER
) {
3208 opt
->ip6po_prefer_tempaddr
= preftemp
;
3212 return (ENOPROTOOPT
);
3213 } /* end of switch */
3220 * Set IPv6 outgoing packet options based on advanced API.
3223 ip6_setpktoptions(struct mbuf
*control
, struct ip6_pktopts
*opt
,
3224 struct ip6_pktopts
*stickyopt
, int uproto
, int priv
)
3226 struct cmsghdr
*cm
= NULL
;
3228 if (control
== NULL
|| opt
== NULL
)
3231 init_ip6pktopts(opt
);
3234 * XXX: Currently, we assume all the optional information is stored
3241 * If stickyopt is provided, make a local copy of the options
3242 * for this particular packet, then override them by ancillary
3244 * XXX: copypktopts() does not copy the cached route to a next
3245 * hop (if any). This is not very good in terms of efficiency,
3246 * but we can allow this since this option should be rarely
3249 if ((error
= copypktopts(opt
, stickyopt
, M_NOWAIT
)) != 0)
3254 * XXX: Currently, we assume all the optional information is stored
3257 if (control
->m_next
)
3260 for (; control
->m_len
; control
->m_data
+= CMSG_ALIGN(cm
->cmsg_len
),
3261 control
->m_len
-= CMSG_ALIGN(cm
->cmsg_len
)) {
3264 if (control
->m_len
< CMSG_LEN(0))
3267 cm
= mtod(control
, struct cmsghdr
*);
3268 if (cm
->cmsg_len
== 0 || cm
->cmsg_len
> control
->m_len
)
3270 if (cm
->cmsg_level
!= IPPROTO_IPV6
)
3273 error
= ip6_setpktoption(cm
->cmsg_type
, CMSG_DATA(cm
),
3274 cm
->cmsg_len
- CMSG_LEN(0), opt
, 0, 1, uproto
, priv
);
3283 * Routine called from ip6_output() to loop back a copy of an IP6 multicast
3284 * packet to the input queue of a specified interface. Note that this
3285 * calls the output routine of the loopback "driver", but with an interface
3286 * pointer that might NOT be &loif -- easier than replicating that code here.
3289 ip6_mloopback(struct ifnet
*ifp
, struct mbuf
*m
, struct sockaddr_in6
*dst
)
3292 struct ip6_hdr
*ip6
;
3294 copym
= m_copy(m
, 0, M_COPYALL
);
3299 * Make sure to deep-copy IPv6 header portion in case the data
3300 * is in an mbuf cluster, so that we can safely override the IPv6
3301 * header portion later.
3303 if ((copym
->m_flags
& M_EXT
) != 0 ||
3304 copym
->m_len
< sizeof(struct ip6_hdr
)) {
3305 copym
= m_pullup(copym
, sizeof(struct ip6_hdr
));
3311 if (copym
->m_len
< sizeof(*ip6
)) {
3317 ip6
= mtod(copym
, struct ip6_hdr
*);
3319 * clear embedded scope identifiers if necessary.
3320 * in6_clearscope will touch the addresses only when necessary.
3322 in6_clearscope(&ip6
->ip6_src
);
3323 in6_clearscope(&ip6
->ip6_dst
);
3325 if_simloop(ifp
, copym
, dst
->sin6_family
, 0);
3329 * Separate the IPv6 header from the payload into its own mbuf.
3331 * Returns the new mbuf chain or the original mbuf if no payload.
3332 * Returns NULL if can't allocate new mbuf for header.
3334 static struct mbuf
*
3335 ip6_splithdr(struct mbuf
*m
)
3339 if (m
->m_len
<= sizeof(struct ip6_hdr
)) /* no payload */
3342 MGETHDR(mh
, MB_DONTWAIT
, MT_HEADER
);
3345 mh
->m_len
= sizeof(struct ip6_hdr
);
3346 M_MOVE_PKTHDR(mh
, m
);
3347 MH_ALIGN(mh
, sizeof(struct ip6_hdr
));
3348 bcopy(mtod(m
, caddr_t
), mtod(mh
, caddr_t
), sizeof(struct ip6_hdr
));
3349 m
->m_data
+= sizeof(struct ip6_hdr
);
3350 m
->m_len
-= sizeof(struct ip6_hdr
);
3356 * Compute IPv6 extension header length.
3359 ip6_optlen(struct in6pcb
*in6p
)
3363 if (!in6p
->in6p_outputopts
)
3368 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
3370 len
+= elen(in6p
->in6p_outputopts
->ip6po_hbh
);
3371 if (in6p
->in6p_outputopts
->ip6po_rthdr
)
3372 /* dest1 is valid with rthdr only */
3373 len
+= elen(in6p
->in6p_outputopts
->ip6po_dest1
);
3374 len
+= elen(in6p
->in6p_outputopts
->ip6po_rthdr
);
3375 len
+= elen(in6p
->in6p_outputopts
->ip6po_dest2
);