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Remove advertising clause from all that isn't contrib or userland bin.
[dragonfly.git] / sys / netinet6 / ip6_output.c
blobaea9dd9d9b19062c1e25490cf7c60b7fad9b2777
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 $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * Copyright (c) 1982, 1986, 1988, 1990, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 4. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
62 */
63
64 #include "opt_ip6fw.h"
65 #include "opt_inet.h"
66 #include "opt_inet6.h"
67 #include "opt_ipsec.h"
68
69 #include <sys/param.h>
70 #include <sys/malloc.h>
71 #include <sys/mbuf.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>
78 #include <sys/proc.h>
79 #include <sys/priv.h>
80
81 #include <sys/thread2.h>
82 #include <sys/msgport2.h>
83
84 #include <net/if.h>
85 #include <net/route.h>
86 #include <net/pfil.h>
87
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>
97
98 #ifdef IPSEC
99 #include <netinet6/ipsec.h>
100 #ifdef INET6
101 #include <netinet6/ipsec6.h>
102 #endif
103 #include <netproto/key/key.h>
104 #endif /* IPSEC */
105
106 #ifdef FAST_IPSEC
107 #include <netproto/ipsec/ipsec.h>
108 #include <netproto/ipsec/ipsec6.h>
109 #include <netproto/ipsec/key.h>
110 #endif
111
112 #include <net/ip6fw/ip6_fw.h>
113
114 #include <net/net_osdep.h>
115
116 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options");
117
118 struct ip6_exthdrs {
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;
124 };
125
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 *,
128 int, int, int, int);
129 static int ip6_pcbopts (struct ip6_pktopts **, struct mbuf *,
130 struct socket *, struct sockopt *);
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,
138 struct ip6_frag **);
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);
142
143 /*
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.
149 *
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.
153 */
154 int
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 */
158 struct inpcb *inp)
159 {
160 struct ip6_hdr *ip6, *mhip6;
161 struct ifnet *ifp, *origifp;
162 struct mbuf *m = m0;
163 struct mbuf *mprev;
164 u_char *nexthdrp;
165 int hlen, tlen, len, off;
166 struct route_in6 ip6route;
167 struct sockaddr_in6 *dst;
168 int error = 0;
169 struct in6_ifaddr *ia = NULL;
170 u_long mtu;
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;
178 #ifdef IPSEC
179 boolean_t needipsectun = FALSE;
180 struct secpolicy *sp = NULL;
181 struct socket *so = inp ? inp->inp_socket : NULL;
182
183 ip6 = mtod(m, struct ip6_hdr *);
184 #endif
185 #ifdef FAST_IPSEC
186 boolean_t needipsectun = FALSE;
187 struct secpolicy *sp = NULL;
188
189 ip6 = mtod(m, struct ip6_hdr *);
190 #endif
191
192 bzero(&exthdrs, sizeof exthdrs);
193
194 if (opt) {
195 if ((error = copyexthdr(opt->ip6po_hbh, &exthdrs.ip6e_hbh)))
196 goto freehdrs;
197 if ((error = copyexthdr(opt->ip6po_dest1, &exthdrs.ip6e_dest1)))
198 goto freehdrs;
199 if ((error = copyexthdr(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr)))
200 goto freehdrs;
201 if ((error = copyexthdr(opt->ip6po_dest2, &exthdrs.ip6e_dest2)))
202 goto freehdrs;
203 }
204
205 #ifdef IPSEC
206 /* get a security policy for this packet */
207 if (so == NULL)
208 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error);
209 else
210 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error);
211
212 if (sp == NULL) {
213 ipsec6stat.out_inval++;
214 goto freehdrs;
215 }
216
217 error = 0;
218
219 /* check policy */
220 switch (sp->policy) {
221 case IPSEC_POLICY_DISCARD:
222 /*
223 * This packet is just discarded.
224 */
225 ipsec6stat.out_polvio++;
226 goto freehdrs;
227
228 case IPSEC_POLICY_BYPASS:
229 case IPSEC_POLICY_NONE:
230 /* no need to do IPsec. */
231 needipsec = FALSE;
232 break;
233
234 case IPSEC_POLICY_IPSEC:
235 if (sp->req == NULL) {
236 error = key_spdacquire(sp); /* acquire a policy */
237 goto freehdrs;
238 }
239 needipsec = TRUE;
240 break;
241
242 case IPSEC_POLICY_ENTRUST:
243 default:
244 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy);
245 }
246 #endif /* IPSEC */
247 #ifdef FAST_IPSEC
248 /* get a security policy for this packet */
249 if (inp == NULL)
250 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error);
251 else
252 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error);
253
254 if (sp == NULL) {
255 newipsecstat.ips_out_inval++;
256 goto freehdrs;
257 }
258
259 error = 0;
260
261 /* check policy */
262 switch (sp->policy) {
263 case IPSEC_POLICY_DISCARD:
264 /*
265 * This packet is just discarded.
266 */
267 newipsecstat.ips_out_polvio++;
268 goto freehdrs;
269
270 case IPSEC_POLICY_BYPASS:
271 case IPSEC_POLICY_NONE:
272 /* no need to do IPsec. */
273 needipsec = FALSE;
274 break;
275
276 case IPSEC_POLICY_IPSEC:
277 if (sp->req == NULL) {
278 error = key_spdacquire(sp); /* acquire a policy */
279 goto freehdrs;
280 }
281 needipsec = TRUE;
282 break;
283
284 case IPSEC_POLICY_ENTRUST:
285 default:
286 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy);
287 }
288 #endif /* FAST_IPSEC */
289
290 /*
291 * Calculate the total length of the extension header chain.
292 * Keep the length of the unfragmentable part for fragmentation.
293 */
294 optlen = m_lengthm(exthdrs.ip6e_hbh, NULL) +
295 m_lengthm(exthdrs.ip6e_dest1, NULL) +
296 m_lengthm(exthdrs.ip6e_rthdr, NULL);
297
298 unfragpartlen = optlen + sizeof(struct ip6_hdr);
299
300 /* NOTE: we don't add AH/ESP length here. do that later. */
301 optlen += m_lengthm(exthdrs.ip6e_dest2, NULL);
302
303 /*
304 * If we need IPsec, or there is at least one extension header,
305 * separate IP6 header from the payload.
306 */
307 if ((needipsec || optlen) && !hdrsplit) {
308 exthdrs.ip6e_ip6 = ip6_splithdr(m);
309 if (exthdrs.ip6e_ip6 == NULL) {
310 error = ENOBUFS;
311 goto freehdrs;
312 }
313 m = exthdrs.ip6e_ip6;
314 hdrsplit = TRUE;
315 }
316
317 /* adjust pointer */
318 ip6 = mtod(m, struct ip6_hdr *);
319
320 /* adjust mbuf packet header length */
321 m->m_pkthdr.len += optlen;
322 plen = m->m_pkthdr.len - sizeof(*ip6);
323
324 /* If this is a jumbo payload, insert a jumbo payload option. */
325 if (plen > IPV6_MAXPACKET) {
326 if (!hdrsplit) {
327 exthdrs.ip6e_ip6 = ip6_splithdr(m);
328 if (exthdrs.ip6e_ip6 == NULL) {
329 error = ENOBUFS;
330 goto freehdrs;
331 }
332 m = exthdrs.ip6e_ip6;
333 hdrsplit = TRUE;
334 }
335 /* adjust pointer */
336 ip6 = mtod(m, struct ip6_hdr *);
337 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
338 goto freehdrs;
339 ip6->ip6_plen = 0;
340 } else
341 ip6->ip6_plen = htons(plen);
342
343 /*
344 * Concatenate headers and fill in next header fields.
345 * Here we have, on "m"
346 * IPv6 payload
347 * and we insert headers accordingly. Finally, we should be getting:
348 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
349 *
350 * during the header composing process, "m" points to IPv6 header.
351 * "mprev" points to an extension header prior to esp.
352 */
353
354 nexthdrp = &ip6->ip6_nxt;
355 mprev = m;
356
357 /*
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.
361 *
362 * result: IPv6 dest2 payload
363 * m and mprev will point to IPv6 header.
364 */
365 if (exthdrs.ip6e_dest2) {
366 if (!hdrsplit)
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;
372 }
373
374 /*
375 * Place m1 after mprev.
376 */
377 #define MAKE_CHAIN(m1, mprev, nexthdrp, i)\
378 do {\
379 if (m1) {\
380 if (!hdrsplit)\
381 panic("assumption failed: hdr not split");\
382 *mtod(m1, u_char *) = *nexthdrp;\
383 *nexthdrp = (i);\
384 nexthdrp = mtod(m1, u_char *);\
385 m1->m_next = mprev->m_next;\
386 mprev->m_next = m1;\
387 mprev = m1;\
388 }\
389 } while (0)
390
391 /*
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).
395 */
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);
399
400 #if defined(IPSEC) || defined(FAST_IPSEC)
401 if (needipsec) {
402 struct ipsec_output_state state;
403 int segleft_org = 0;
404 struct ip6_rthdr *rh = NULL;
405
406 /*
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)
410 */
411 exthdrs.ip6e_dest2 = NULL;
412
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;
417 }
418
419 bzero(&state, sizeof state);
420 state.m = m;
421 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags,
422 &needipsectun);
423 m = state.m;
424 if (error) {
425 /* mbuf is already reclaimed in ipsec6_output_trans. */
426 m = NULL;
427 switch (error) {
428 case EHOSTUNREACH:
429 case ENETUNREACH:
430 case EMSGSIZE:
431 case ENOBUFS:
432 case ENOMEM:
433 break;
434 default:
435 kprintf("ip6_output (ipsec): error code %d\n",
436 error);
437 /* fall through */
438 case ENOENT:
439 /* don't show these error codes to the user */
440 error = 0;
441 break;
442 }
443 goto bad;
444 }
445 if (exthdrs.ip6e_rthdr) {
446 /* ah6_output doesn't modify mbuf chain */
447 rh->ip6r_segleft = segleft_org;
448 }
449 }
450 #endif
451
452 /*
453 * If there is a routing header, replace destination address field
454 * with the first hop of the routing header.
455 */
456 if (exthdrs.ip6e_rthdr) {
457 struct ip6_rthdr *rh;
458
459 finaldst = ip6->ip6_dst;
460 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *);
461 switch (rh->ip6r_type) {
462 default: /* is it possible? */
463 error = EINVAL;
464 goto bad;
465 }
466 }
467
468 /* Source address validation */
469 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
470 !(flags & IPV6_DADOUTPUT)) {
471 error = EOPNOTSUPP;
472 ip6stat.ip6s_badscope++;
473 goto bad;
474 }
475 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
476 error = EOPNOTSUPP;
477 ip6stat.ip6s_badscope++;
478 goto bad;
479 }
480
481 ip6stat.ip6s_localout++;
482
483 /*
484 * Route packet.
485 */
486 if (ro == NULL) {
487 ro = &ip6route;
488 bzero(ro, sizeof(*ro));
489 }
490 ro_pmtu = ro;
491 if (opt && opt->ip6po_rthdr)
492 ro = &opt->ip6po_route;
493 dst = (struct sockaddr_in6 *)&ro->ro_dst;
494 /*
495 * If there is a cached route,
496 * check that it is to the same destination
497 * and is still up. If not, free it and try again.
498 */
499 if (ro->ro_rt != NULL &&
500 (!(ro->ro_rt->rt_flags & RTF_UP) || dst->sin6_family != AF_INET6 ||
501 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) {
502 RTFREE(ro->ro_rt);
503 ro->ro_rt = NULL;
504 }
505 if (ro->ro_rt == NULL) {
506 bzero(dst, sizeof(*dst));
507 dst->sin6_family = AF_INET6;
508 dst->sin6_len = sizeof(struct sockaddr_in6);
509 dst->sin6_addr = ip6->ip6_dst;
510 }
511 #if defined(IPSEC) || defined(FAST_IPSEC)
512 if (needipsec && needipsectun) {
513 struct ipsec_output_state state;
514
515 /*
516 * All the extension headers will become inaccessible
517 * (since they can be encrypted).
518 * Don't panic, we need no more updates to extension headers
519 * on inner IPv6 packet (since they are now encapsulated).
520 *
521 * IPv6 [ESP|AH] IPv6 [extension headers] payload
522 */
523 bzero(&exthdrs, sizeof(exthdrs));
524 exthdrs.ip6e_ip6 = m;
525
526 bzero(&state, sizeof(state));
527 state.m = m;
528 state.ro = (struct route *)ro;
529 state.dst = (struct sockaddr *)dst;
530
531 error = ipsec6_output_tunnel(&state, sp, flags);
532
533 m = state.m;
534 ro = (struct route_in6 *)state.ro;
535 dst = (struct sockaddr_in6 *)state.dst;
536 if (error) {
537 /* mbuf is already reclaimed in ipsec6_output_tunnel. */
538 m0 = m = NULL;
539 m = NULL;
540 switch (error) {
541 case EHOSTUNREACH:
542 case ENETUNREACH:
543 case EMSGSIZE:
544 case ENOBUFS:
545 case ENOMEM:
546 break;
547 default:
548 kprintf("ip6_output (ipsec): error code %d\n", error);
549 /* fall through */
550 case ENOENT:
551 /* don't show these error codes to the user */
552 error = 0;
553 break;
554 }
555 goto bad;
556 }
557
558 exthdrs.ip6e_ip6 = m;
559 }
560 #endif
561
562 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
563 /* Unicast */
564
565 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
566 #define sin6tosa(sin6) ((struct sockaddr *)(sin6))
567 /* xxx
568 * interface selection comes here
569 * if an interface is specified from an upper layer,
570 * ifp must point it.
571 */
572 if (ro->ro_rt == NULL) {
573 /*
574 * non-bsdi always clone routes, if parent is
575 * PRF_CLONING.
576 */
577 rtalloc((struct route *)ro);
578 }
579 if (ro->ro_rt == NULL) {
580 ip6stat.ip6s_noroute++;
581 error = EHOSTUNREACH;
582 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */
583 goto bad;
584 }
585 ia = ifatoia6(ro->ro_rt->rt_ifa);
586 ifp = ro->ro_rt->rt_ifp;
587 ro->ro_rt->rt_use++;
588 if (ro->ro_rt->rt_flags & RTF_GATEWAY)
589 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway;
590 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
591
592 in6_ifstat_inc(ifp, ifs6_out_request);
593
594 /*
595 * Check if the outgoing interface conflicts with
596 * the interface specified by ifi6_ifindex (if specified).
597 * Note that loopback interface is always okay.
598 * (this may happen when we are sending a packet to one of
599 * our own addresses.)
600 */
601 if (opt && opt->ip6po_pktinfo
602 && opt->ip6po_pktinfo->ipi6_ifindex) {
603 if (!(ifp->if_flags & IFF_LOOPBACK)
604 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) {
605 ip6stat.ip6s_noroute++;
606 in6_ifstat_inc(ifp, ifs6_out_discard);
607 error = EHOSTUNREACH;
608 goto bad;
609 }
610 }
611
612 if (opt && opt->ip6po_hlim != -1)
613 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
614 } else {
615 /* Multicast */
616 struct in6_multi *in6m;
617
618 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
619
620 /*
621 * See if the caller provided any multicast options
622 */
623 ifp = NULL;
624 if (im6o != NULL) {
625 ip6->ip6_hlim = im6o->im6o_multicast_hlim;
626 if (im6o->im6o_multicast_ifp != NULL)
627 ifp = im6o->im6o_multicast_ifp;
628 } else
629 ip6->ip6_hlim = ip6_defmcasthlim;
630
631 /*
632 * See if the caller provided the outgoing interface
633 * as an ancillary data.
634 * Boundary check for ifindex is assumed to be already done.
635 */
636 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex)
637 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex];
638
639 /*
640 * If the destination is a node-local scope multicast,
641 * the packet should be loop-backed only.
642 */
643 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) {
644 /*
645 * If the outgoing interface is already specified,
646 * it should be a loopback interface.
647 */
648 if (ifp && !(ifp->if_flags & IFF_LOOPBACK)) {
649 ip6stat.ip6s_badscope++;
650 error = ENETUNREACH; /* XXX: better error? */
651 /* XXX correct ifp? */
652 in6_ifstat_inc(ifp, ifs6_out_discard);
653 goto bad;
654 } else {
655 ifp = &loif[0];
656 }
657 }
658
659 if (opt && opt->ip6po_hlim != -1)
660 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
661
662 /*
663 * If caller did not provide an interface lookup a
664 * default in the routing table. This is either a
665 * default for the speicfied group (i.e. a host
666 * route), or a multicast default (a route for the
667 * ``net'' ff00::/8).
668 */
669 if (ifp == NULL) {
670 if (ro->ro_rt == NULL) {
671 ro->ro_rt =
672 rtpurelookup((struct sockaddr *)&ro->ro_dst);
673 }
674 if (ro->ro_rt == NULL) {
675 ip6stat.ip6s_noroute++;
676 error = EHOSTUNREACH;
677 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */
678 goto bad;
679 }
680 ia = ifatoia6(ro->ro_rt->rt_ifa);
681 ifp = ro->ro_rt->rt_ifp;
682 ro->ro_rt->rt_use++;
683 }
684
685 if (!(flags & IPV6_FORWARDING))
686 in6_ifstat_inc(ifp, ifs6_out_request);
687 in6_ifstat_inc(ifp, ifs6_out_mcast);
688
689 /*
690 * Confirm that the outgoing interface supports multicast.
691 */
692 if (!(ifp->if_flags & IFF_MULTICAST)) {
693 ip6stat.ip6s_noroute++;
694 in6_ifstat_inc(ifp, ifs6_out_discard);
695 error = ENETUNREACH;
696 goto bad;
697 }
698 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
699 if (in6m != NULL &&
700 (im6o == NULL || im6o->im6o_multicast_loop)) {
701 /*
702 * If we belong to the destination multicast group
703 * on the outgoing interface, and the caller did not
704 * forbid loopback, loop back a copy.
705 */
706 ip6_mloopback(ifp, m, dst);
707 } else {
708 /*
709 * If we are acting as a multicast router, perform
710 * multicast forwarding as if the packet had just
711 * arrived on the interface to which we are about
712 * to send. The multicast forwarding function
713 * recursively calls this function, using the
714 * IPV6_FORWARDING flag to prevent infinite recursion.
715 *
716 * Multicasts that are looped back by ip6_mloopback(),
717 * above, will be forwarded by the ip6_input() routine,
718 * if necessary.
719 */
720 if (ip6_mrouter && !(flags & IPV6_FORWARDING)) {
721 if (ip6_mforward(ip6, ifp, m) != 0) {
722 m_freem(m);
723 goto done;
724 }
725 }
726 }
727 /*
728 * Multicasts with a hoplimit of zero may be looped back,
729 * above, but must not be transmitted on a network.
730 * Also, multicasts addressed to the loopback interface
731 * are not sent -- the above call to ip6_mloopback() will
732 * loop back a copy if this host actually belongs to the
733 * destination group on the loopback interface.
734 */
735 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) {
736 m_freem(m);
737 goto done;
738 }
739 }
740
741 /*
742 * Fill the outgoing inteface to tell the upper layer
743 * to increment per-interface statistics.
744 */
745 if (ifpp)
746 *ifpp = ifp;
747
748 /* Determine path MTU. */
749 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu,
750 &alwaysfrag)) != 0)
751 goto bad;
752
753 /*
754 * The caller of this function may specify to use the minimum MTU
755 * in some cases.
756 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
757 * setting. The logic is a bit complicated; by default, unicast
758 * packets will follow path MTU while multicast packets will be sent at
759 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
760 * including unicast ones will be sent at the minimum MTU. Multicast
761 * packets will always be sent at the minimum MTU unless
762 * IP6PO_MINMTU_DISABLE is explicitly specified.
763 * See RFC 3542 for more details.
764 */
765 if (mtu > IPV6_MMTU) {
766 if ((flags & IPV6_MINMTU))
767 mtu = IPV6_MMTU;
768 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
769 mtu = IPV6_MMTU;
770 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
771 (opt == NULL ||
772 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
773 mtu = IPV6_MMTU;
774 }
775 }
776
777 /* Fake scoped addresses */
778 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
779 /*
780 * If source or destination address is a scoped address, and
781 * the packet is going to be sent to a loopback interface,
782 * we should keep the original interface.
783 */
784
785 /*
786 * XXX: this is a very experimental and temporary solution.
787 * We eventually have sockaddr_in6 and use the sin6_scope_id
788 * field of the structure here.
789 * We rely on the consistency between two scope zone ids
790 * of source and destination, which should already be assured.
791 * Larger scopes than link will be supported in the future.
792 */
793 origifp = NULL;
794 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
795 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])];
796 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
797 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])];
798 /*
799 * XXX: origifp can be NULL even in those two cases above.
800 * For example, if we remove the (only) link-local address
801 * from the loopback interface, and try to send a link-local
802 * address without link-id information. Then the source
803 * address is ::1, and the destination address is the
804 * link-local address with its s6_addr16[1] being zero.
805 * What is worse, if the packet goes to the loopback interface
806 * by a default rejected route, the null pointer would be
807 * passed to looutput, and the kernel would hang.
808 * The following last resort would prevent such disaster.
809 */
810 if (origifp == NULL)
811 origifp = ifp;
812 }
813 else
814 origifp = ifp;
815 /*
816 * clear embedded scope identifiers if necessary.
817 * in6_clearscope will touch the addresses only when necessary.
818 */
819 in6_clearscope(&ip6->ip6_src);
820 in6_clearscope(&ip6->ip6_dst);
821
822 /*
823 * Check with the firewall...
824 */
825 if (ip6_fw_enable && ip6_fw_chk_ptr) {
826 u_short port = 0;
827
828 m->m_pkthdr.rcvif = NULL; /* XXX */
829 /* If ipfw says divert, we have to just drop packet */
830 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) {
831 m_freem(m);
832 goto done;
833 }
834 if (!m) {
835 error = EACCES;
836 goto done;
837 }
838 }
839
840 /*
841 * If the outgoing packet contains a hop-by-hop options header,
842 * it must be examined and processed even by the source node.
843 * (RFC 2460, section 4.)
844 */
845 if (exthdrs.ip6e_hbh) {
846 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
847 u_int32_t dummy1; /* XXX unused */
848 u_int32_t dummy2; /* XXX unused */
849
850 #ifdef DIAGNOSTIC
851 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
852 panic("ip6e_hbh is not continuous");
853 #endif
854 /*
855 * XXX: if we have to send an ICMPv6 error to the sender,
856 * we need the M_LOOP flag since icmp6_error() expects
857 * the IPv6 and the hop-by-hop options header are
858 * continuous unless the flag is set.
859 */
860 m->m_flags |= M_LOOP;
861 m->m_pkthdr.rcvif = ifp;
862 if (ip6_process_hopopts(m,
863 (u_int8_t *)(hbh + 1),
864 ((hbh->ip6h_len + 1) << 3) -
865 sizeof(struct ip6_hbh),
866 &dummy1, &dummy2) < 0) {
867 /* m was already freed at this point */
868 error = EINVAL;/* better error? */
869 goto done;
870 }
871 m->m_flags &= ~M_LOOP; /* XXX */
872 m->m_pkthdr.rcvif = NULL;
873 }
874
875 /*
876 * Run through list of hooks for output packets.
877 */
878 if (pfil_has_hooks(&inet6_pfil_hook)) {
879 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT);
880 if (error != 0 || m == NULL)
881 goto done;
882 ip6 = mtod(m, struct ip6_hdr *);
883 }
884
885 /*
886 * Send the packet to the outgoing interface.
887 * If necessary, do IPv6 fragmentation before sending.
888 *
889 * the logic here is rather complex:
890 * 1: normal case (dontfrag == 0, alwaysfrag == 0)
891 * 1-a: send as is if tlen <= path mtu
892 * 1-b: fragment if tlen > path mtu
893 *
894 * 2: if user asks us not to fragment (dontfrag == 1)
895 * 2-a: send as is if tlen <= interface mtu
896 * 2-b: error if tlen > interface mtu
897 *
898 * 3: if we always need to attach fragment header (alwaysfrag == 1)
899 * always fragment
900 *
901 * 4: if dontfrag == 1 && alwaysfrag == 1
902 * error, as we cannot handle this conflicting request
903 */
904 tlen = m->m_pkthdr.len;
905
906 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG))
907 dontfrag = 1;
908 else
909 dontfrag = 0;
910 if (dontfrag && alwaysfrag) { /* case 4 */
911 /* conflicting request - can't transmit */
912 error = EMSGSIZE;
913 goto bad;
914 }
915 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */
916 /*
917 * Even if the DONTFRAG option is specified, we cannot send the
918 * packet when the data length is larger than the MTU of the
919 * outgoing interface.
920 * Notify the error by sending IPV6_PATHMTU ancillary data as
921 * well as returning an error code (the latter is not described
922 * in the API spec.)
923 */
924 u_int32_t mtu32;
925 struct ip6ctlparam ip6cp;
926
927 mtu32 = (u_int32_t)mtu;
928 bzero(&ip6cp, sizeof(ip6cp));
929 ip6cp.ip6c_cmdarg = (void *)&mtu32;
930 kpfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
931 (void *)&ip6cp);
932
933 error = EMSGSIZE;
934 goto bad;
935 }
936
937 /*
938 * transmit packet without fragmentation
939 */
940 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
941 struct in6_ifaddr *ia6;
942
943 ip6 = mtod(m, struct ip6_hdr *);
944 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
945 if (ia6) {
946 /* Record statistics for this interface address. */
947 IFA_STAT_INC(&ia6->ia_ifa, opackets, 1);
948 IFA_STAT_INC(&ia6->ia_ifa, obytes, m->m_pkthdr.len);
949 }
950 #ifdef IPSEC
951 /* clean ipsec history once it goes out of the node */
952 ipsec_delaux(m);
953 #endif
954 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
955 goto done;
956 }
957
958 /*
959 * try to fragment the packet. case 1-b and 3
960 */
961 if (mtu < IPV6_MMTU) {
962 /*
963 * note that path MTU is never less than IPV6_MMTU
964 * (see icmp6_input).
965 */
966 error = EMSGSIZE;
967 in6_ifstat_inc(ifp, ifs6_out_fragfail);
968 goto bad;
969 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */
970 error = EMSGSIZE;
971 in6_ifstat_inc(ifp, ifs6_out_fragfail);
972 goto bad;
973 } else {
974 struct mbuf **mnext, *m_frgpart;
975 struct ip6_frag *ip6f;
976 u_int32_t id = htonl(ip6_id++);
977 u_char nextproto;
978
979 /*
980 * Too large for the destination or interface;
981 * fragment if possible.
982 * Must be able to put at least 8 bytes per fragment.
983 */
984 hlen = unfragpartlen;
985 if (mtu > IPV6_MAXPACKET)
986 mtu = IPV6_MAXPACKET;
987
988 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
989 if (len < 8) {
990 error = EMSGSIZE;
991 in6_ifstat_inc(ifp, ifs6_out_fragfail);
992 goto bad;
993 }
994
995 mnext = &m->m_nextpkt;
996
997 /*
998 * Change the next header field of the last header in the
999 * unfragmentable part.
1000 */
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;
1010 } else {
1011 nextproto = ip6->ip6_nxt;
1012 ip6->ip6_nxt = IPPROTO_FRAGMENT;
1013 }
1014
1015 /*
1016 * Loop through length of segment after first fragment,
1017 * make new header and copy data of each part and link onto
1018 * chain.
1019 */
1020 m0 = m;
1021 for (off = hlen; off < tlen; off += len) {
1022 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
1023 if (!m) {
1024 error = ENOBUFS;
1025 ip6stat.ip6s_odropped++;
1026 goto sendorfree;
1027 }
1028 m->m_pkthdr.rcvif = NULL;
1029 m->m_flags = m0->m_flags & M_COPYFLAGS;
1030 *mnext = m;
1031 mnext = &m->m_nextpkt;
1032 m->m_data += max_linkhdr;
1033 mhip6 = mtod(m, struct ip6_hdr *);
1034 *mhip6 = *ip6;
1035 m->m_len = sizeof(*mhip6);
1036 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
1037 if (error) {
1038 ip6stat.ip6s_odropped++;
1039 goto sendorfree;
1040 }
1041 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
1042 if (off + len >= tlen)
1043 len = tlen - off;
1044 else
1045 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
1046 mhip6->ip6_plen = htons((u_short)(len + hlen +
1047 sizeof(*ip6f) -
1048 sizeof(struct ip6_hdr)));
1049 if ((m_frgpart = m_copy(m0, off, len)) == NULL) {
1050 error = ENOBUFS;
1051 ip6stat.ip6s_odropped++;
1052 goto sendorfree;
1053 }
1054 m_cat(m, m_frgpart);
1055 m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
1056 m->m_pkthdr.rcvif = NULL;
1057 ip6f->ip6f_reserved = 0;
1058 ip6f->ip6f_ident = id;
1059 ip6f->ip6f_nxt = nextproto;
1060 ip6stat.ip6s_ofragments++;
1061 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
1062 }
1063
1064 in6_ifstat_inc(ifp, ifs6_out_fragok);
1065 }
1066
1067 /*
1068 * Remove leading garbages.
1069 */
1070 sendorfree:
1071 m = m0->m_nextpkt;
1072 m0->m_nextpkt = NULL;
1073 m_freem(m0);
1074 for (m0 = m; m; m = m0) {
1075 m0 = m->m_nextpkt;
1076 m->m_nextpkt = NULL;
1077 if (error == 0) {
1078 /* Record statistics for this interface address. */
1079 if (ia) {
1080 IFA_STAT_INC(&ia->ia_ifa, opackets, 1);
1081 IFA_STAT_INC(&ia->ia_ifa, obytes,
1082 m->m_pkthdr.len);
1083 }
1084 #ifdef IPSEC
1085 /* clean ipsec history once it goes out of the node */
1086 ipsec_delaux(m);
1087 #endif
1088 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
1089 } else
1090 m_freem(m);
1091 }
1092
1093 if (error == 0)
1094 ip6stat.ip6s_fragmented++;
1095
1096 done:
1097 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */
1098 RTFREE(ro->ro_rt);
1099 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) {
1100 RTFREE(ro_pmtu->ro_rt);
1101 }
1102
1103 #ifdef IPSEC
1104 if (sp != NULL)
1105 key_freesp(sp);
1106 #endif
1107 #ifdef FAST_IPSEC
1108 if (sp != NULL)
1109 KEY_FREESP(&sp);
1110 #endif
1111
1112 return (error);
1113
1114 freehdrs:
1115 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */
1116 m_freem(exthdrs.ip6e_dest1);
1117 m_freem(exthdrs.ip6e_rthdr);
1118 m_freem(exthdrs.ip6e_dest2);
1119 /* fall through */
1120 bad:
1121 m_freem(m);
1122 goto done;
1123 }
1124
1125 static int
1126 copyexthdr(void *h, struct mbuf **mp)
1127 {
1128 struct ip6_ext *hdr = h;
1129 int hlen;
1130 struct mbuf *m;
1131
1132 if (hdr == NULL)
1133 return 0;
1134
1135 hlen = (hdr->ip6e_len + 1) * 8;
1136 if (hlen > MCLBYTES)
1137 return ENOBUFS; /* XXX */
1138
1139 m = m_getb(hlen, MB_DONTWAIT, MT_DATA, 0);
1140 if (!m)
1141 return ENOBUFS;
1142 m->m_len = hlen;
1143
1144 bcopy(hdr, mtod(m, caddr_t), hlen);
1145
1146 *mp = m;
1147 return 0;
1148 }
1149
1150 /*
1151 * Insert jumbo payload option.
1152 */
1153 static int
1154 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1155 {
1156 struct mbuf *mopt;
1157 u_char *optbuf;
1158 u_int32_t v;
1159
1160 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */
1161
1162 /*
1163 * If there is no hop-by-hop options header, allocate new one.
1164 * If there is one but it doesn't have enough space to store the
1165 * jumbo payload option, allocate a cluster to store the whole options.
1166 * Otherwise, use it to store the options.
1167 */
1168 if (exthdrs->ip6e_hbh == NULL) {
1169 MGET(mopt, MB_DONTWAIT, MT_DATA);
1170 if (mopt == NULL)
1171 return (ENOBUFS);
1172 mopt->m_len = JUMBOOPTLEN;
1173 optbuf = mtod(mopt, u_char *);
1174 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */
1175 exthdrs->ip6e_hbh = mopt;
1176 } else {
1177 struct ip6_hbh *hbh;
1178
1179 mopt = exthdrs->ip6e_hbh;
1180 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1181 /*
1182 * XXX assumption:
1183 * - exthdrs->ip6e_hbh is not referenced from places
1184 * other than exthdrs.
1185 * - exthdrs->ip6e_hbh is not an mbuf chain.
1186 */
1187 int oldoptlen = mopt->m_len;
1188 struct mbuf *n;
1189
1190 /*
1191 * XXX: give up if the whole (new) hbh header does
1192 * not fit even in an mbuf cluster.
1193 */
1194 if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1195 return (ENOBUFS);
1196
1197 /*
1198 * As a consequence, we must always prepare a cluster
1199 * at this point.
1200 */
1201 n = m_getcl(MB_DONTWAIT, MT_DATA, 0);
1202 if (!n)
1203 return (ENOBUFS);
1204 n->m_len = oldoptlen + JUMBOOPTLEN;
1205 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), oldoptlen);
1206 optbuf = mtod(n, caddr_t) + oldoptlen;
1207 m_freem(mopt);
1208 mopt = exthdrs->ip6e_hbh = n;
1209 } else {
1210 optbuf = mtod(mopt, u_char *) + mopt->m_len;
1211 mopt->m_len += JUMBOOPTLEN;
1212 }
1213 optbuf[0] = IP6OPT_PADN;
1214 optbuf[1] = 1;
1215
1216 /*
1217 * Adjust the header length according to the pad and
1218 * the jumbo payload option.
1219 */
1220 hbh = mtod(mopt, struct ip6_hbh *);
1221 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1222 }
1223
1224 /* fill in the option. */
1225 optbuf[2] = IP6OPT_JUMBO;
1226 optbuf[3] = 4;
1227 v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1228 bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1229
1230 /* finally, adjust the packet header length */
1231 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1232
1233 return (0);
1234 #undef JUMBOOPTLEN
1235 }
1236
1237 /*
1238 * Insert fragment header and copy unfragmentable header portions.
1239 */
1240 static int
1241 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1242 struct ip6_frag **frghdrp)
1243 {
1244 struct mbuf *n, *mlast;
1245
1246 if (hlen > sizeof(struct ip6_hdr)) {
1247 n = m_copym(m0, sizeof(struct ip6_hdr),
1248 hlen - sizeof(struct ip6_hdr), MB_DONTWAIT);
1249 if (n == NULL)
1250 return (ENOBUFS);
1251 m->m_next = n;
1252 } else
1253 n = m;
1254
1255 /* Search for the last mbuf of unfragmentable part. */
1256 for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1257 ;
1258
1259 if (!(mlast->m_flags & M_EXT) &&
1260 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1261 /* use the trailing space of the last mbuf for the fragment hdr */
1262 *frghdrp =
1263 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len);
1264 mlast->m_len += sizeof(struct ip6_frag);
1265 m->m_pkthdr.len += sizeof(struct ip6_frag);
1266 } else {
1267 /* allocate a new mbuf for the fragment header */
1268 struct mbuf *mfrg;
1269
1270 MGET(mfrg, MB_DONTWAIT, MT_DATA);
1271 if (mfrg == NULL)
1272 return (ENOBUFS);
1273 mfrg->m_len = sizeof(struct ip6_frag);
1274 *frghdrp = mtod(mfrg, struct ip6_frag *);
1275 mlast->m_next = mfrg;
1276 }
1277
1278 return (0);
1279 }
1280
1281 static int
1282 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro,
1283 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup,
1284 int *alwaysfragp)
1285 {
1286 u_int32_t mtu = 0;
1287 int alwaysfrag = 0;
1288 int error = 0;
1289
1290 if (ro_pmtu != ro) {
1291 /* The first hop and the final destination may differ. */
1292 struct sockaddr_in6 *sa6_dst =
1293 (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1294 if (ro_pmtu->ro_rt &&
1295 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 ||
1296 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) {
1297 RTFREE(ro_pmtu->ro_rt);
1298 ro_pmtu->ro_rt = NULL;
1299 }
1300 if (ro_pmtu->ro_rt == NULL) {
1301 bzero(sa6_dst, sizeof(*sa6_dst));
1302 sa6_dst->sin6_family = AF_INET6;
1303 sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1304 sa6_dst->sin6_addr = *dst;
1305
1306 rtalloc((struct route *)ro_pmtu);
1307 }
1308 }
1309 if (ro_pmtu->ro_rt) {
1310 u_int32_t ifmtu;
1311 struct in_conninfo inc;
1312
1313 bzero(&inc, sizeof(inc));
1314 inc.inc_flags = 1; /* IPv6 */
1315 inc.inc6_faddr = *dst;
1316
1317 if (ifp == NULL)
1318 ifp = ro_pmtu->ro_rt->rt_ifp;
1319 ifmtu = IN6_LINKMTU(ifp);
1320 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu;
1321 if (mtu == 0)
1322 mtu = ifmtu;
1323 else if (mtu < IPV6_MMTU) {
1324 /*
1325 * RFC2460 section 5, last paragraph:
1326 * if we record ICMPv6 too big message with
1327 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1328 * or smaller, with framgent header attached.
1329 * (fragment header is needed regardless from the
1330 * packet size, for translators to identify packets)
1331 */
1332 alwaysfrag = 1;
1333 mtu = IPV6_MMTU;
1334 } else if (mtu > ifmtu) {
1335 /*
1336 * The MTU on the route is larger than the MTU on
1337 * the interface! This shouldn't happen, unless the
1338 * MTU of the interface has been changed after the
1339 * interface was brought up. Change the MTU in the
1340 * route to match the interface MTU (as long as the
1341 * field isn't locked).
1342 */
1343 mtu = ifmtu;
1344 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu;
1345 }
1346 } else if (ifp) {
1347 mtu = IN6_LINKMTU(ifp);
1348 } else
1349 error = EHOSTUNREACH; /* XXX */
1350
1351 *mtup = mtu;
1352 if (alwaysfragp)
1353 *alwaysfragp = alwaysfrag;
1354 return (error);
1355 }
1356
1357 /*
1358 * IP6 socket option processing.
1359 */
1360 void
1361 ip6_ctloutput_dispatch(netmsg_t msg)
1362 {
1363 int error;
1364
1365 error = ip6_ctloutput(msg->ctloutput.base.nm_so,
1366 msg->ctloutput.nm_sopt);
1367 lwkt_replymsg(&msg->ctloutput.base.lmsg, error);
1368 }
1369
1370 int
1371 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1372 {
1373 int optdatalen,uproto;
1374 int privileged;
1375 struct inpcb *in6p = so->so_pcb;
1376 void *optdata;
1377 int error, optval;
1378 int level, op, optname;
1379 int optlen;
1380 struct thread *td;
1381
1382 if (sopt) {
1383 level = sopt->sopt_level;
1384 op = sopt->sopt_dir;
1385 optname = sopt->sopt_name;
1386 optlen = sopt->sopt_valsize;
1387 td = sopt->sopt_td;
1388 } else {
1389 panic("ip6_ctloutput: arg soopt is NULL");
1390 /* NOT REACHED */
1391 td = NULL;
1392 }
1393 error = optval = 0;
1394
1395 uproto = (int)so->so_proto->pr_protocol;
1396 privileged = (td == NULL || priv_check(td, PRIV_ROOT)) ? 0 : 1;
1397
1398 if (level == IPPROTO_IPV6) {
1399 switch (op) {
1400
1401 case SOPT_SET:
1402 switch (optname) {
1403 case IPV6_2292PKTOPTIONS:
1404 #ifdef IPV6_PKTOPTIONS
1405 case IPV6_PKTOPTIONS:
1406 #endif
1407 {
1408 struct mbuf *m;
1409
1410 error = soopt_getm(sopt, &m); /* XXX */
1411 if (error != 0)
1412 break;
1413 soopt_to_mbuf(sopt, m); /* XXX */
1414 error = ip6_pcbopts(&in6p->in6p_outputopts,
1415 m, so, sopt);
1416 m_freem(m); /* XXX */
1417 break;
1418 }
1419
1420 /*
1421 * Use of some Hop-by-Hop options or some
1422 * Destination options, might require special
1423 * privilege. That is, normal applications
1424 * (without special privilege) might be forbidden
1425 * from setting certain options in outgoing packets,
1426 * and might never see certain options in received
1427 * packets. [RFC 2292 Section 6]
1428 * KAME specific note:
1429 * KAME prevents non-privileged users from sending or
1430 * receiving ANY hbh/dst options in order to avoid
1431 * overhead of parsing options in the kernel.
1432 */
1433 case IPV6_RECVHOPOPTS:
1434 case IPV6_RECVDSTOPTS:
1435 case IPV6_RECVRTHDRDSTOPTS:
1436 if (!privileged)
1437 return (EPERM);
1438 case IPV6_RECVPKTINFO:
1439 case IPV6_RECVHOPLIMIT:
1440 case IPV6_RECVRTHDR:
1441 case IPV6_RECVPATHMTU:
1442 case IPV6_RECVTCLASS:
1443 case IPV6_AUTOFLOWLABEL:
1444 case IPV6_HOPLIMIT:
1445 /* FALLTHROUGH */
1446 case IPV6_UNICAST_HOPS:
1447 case IPV6_FAITH:
1448
1449 case IPV6_V6ONLY:
1450 if (optlen != sizeof(int)) {
1451 error = EINVAL;
1452 break;
1453 }
1454 error = soopt_to_kbuf(sopt, &optval,
1455 sizeof optval, sizeof optval);
1456 if (error)
1457 break;
1458 switch (optname) {
1459
1460 case IPV6_UNICAST_HOPS:
1461 if (optval < -1 || optval >= 256)
1462 error = EINVAL;
1463 else {
1464 /* -1 = kernel default */
1465 in6p->in6p_hops = optval;
1466
1467 if ((in6p->in6p_vflag &
1468 INP_IPV4) != 0)
1469 in6p->inp_ip_ttl = optval;
1470 }
1471 break;
1472 #define OPTSET(bit) \
1473 do { \
1474 if (optval) \
1475 in6p->in6p_flags |= (bit); \
1476 else \
1477 in6p->in6p_flags &= ~(bit); \
1478 } while (0)
1479 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0)
1480 /*
1481 * Although changed to RFC3542, It's better to also support RFC2292 API
1482 */
1483 #define OPTSET2292(bit) \
1484 do { \
1485 in6p->in6p_flags |= IN6P_RFC2292; \
1486 if (optval) \
1487 in6p->in6p_flags |= (bit); \
1488 else \
1489 in6p->in6p_flags &= ~(bit); \
1490 } while (/*CONSTCOND*/ 0)
1491
1492 case IPV6_RECVPKTINFO:
1493 /* cannot mix with RFC2292 */
1494 if (OPTBIT(IN6P_RFC2292)) {
1495 error = EINVAL;
1496 break;
1497 }
1498 OPTSET(IN6P_PKTINFO);
1499 break;
1500
1501 case IPV6_HOPLIMIT:
1502 {
1503 struct ip6_pktopts **optp;
1504
1505 /* cannot mix with RFC2292 */
1506 if (OPTBIT(IN6P_RFC2292)) {
1507 error = EINVAL;
1508 break;
1509 }
1510 optp = &in6p->in6p_outputopts;
1511 error = ip6_pcbopt(IPV6_HOPLIMIT,
1512 (u_char *)&optval, sizeof(optval),
1513 optp, uproto);
1514 break;
1515 }
1516
1517 case IPV6_RECVHOPLIMIT:
1518 /* cannot mix with RFC2292 */
1519 if (OPTBIT(IN6P_RFC2292)) {
1520 error = EINVAL;
1521 break;
1522 }
1523 OPTSET(IN6P_HOPLIMIT);
1524 break;
1525
1526 case IPV6_RECVHOPOPTS:
1527 /* cannot mix with RFC2292 */
1528 if (OPTBIT(IN6P_RFC2292)) {
1529 error = EINVAL;
1530 break;
1531 }
1532 OPTSET(IN6P_HOPOPTS);
1533 break;
1534
1535 case IPV6_RECVDSTOPTS:
1536 /* cannot mix with RFC2292 */
1537 if (OPTBIT(IN6P_RFC2292)) {
1538 error = EINVAL;
1539 break;
1540 }
1541 OPTSET(IN6P_DSTOPTS);
1542 break;
1543
1544 case IPV6_RECVRTHDRDSTOPTS:
1545 /* cannot mix with RFC2292 */
1546 if (OPTBIT(IN6P_RFC2292)) {
1547 error = EINVAL;
1548 break;
1549 }
1550 OPTSET(IN6P_RTHDRDSTOPTS);
1551 break;
1552
1553 case IPV6_RECVRTHDR:
1554 /* cannot mix with RFC2292 */
1555 if (OPTBIT(IN6P_RFC2292)) {
1556 error = EINVAL;
1557 break;
1558 }
1559 OPTSET(IN6P_RTHDR);
1560 break;
1561
1562 case IPV6_RECVPATHMTU:
1563 /*
1564 * We ignore this option for TCP
1565 * sockets.
1566 * (RFC3542 leaves this case
1567 * unspecified.)
1568 */
1569 if (uproto != IPPROTO_TCP)
1570 OPTSET(IN6P_MTU);
1571 break;
1572
1573 case IPV6_RECVTCLASS:
1574 /* cannot mix with RFC2292 XXX */
1575 if (OPTBIT(IN6P_RFC2292)) {
1576 error = EINVAL;
1577 break;
1578 }
1579 OPTSET(IN6P_TCLASS);
1580 break;
1581
1582 case IPV6_AUTOFLOWLABEL:
1583 OPTSET(IN6P_AUTOFLOWLABEL);
1584 break;
1585
1586 case IPV6_FAITH:
1587 OPTSET(IN6P_FAITH);
1588 break;
1589
1590 case IPV6_V6ONLY:
1591 /*
1592 * make setsockopt(IPV6_V6ONLY)
1593 * available only prior to bind(2).
1594 */
1595 if (in6p->in6p_lport ||
1596 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr))
1597 {
1598 error = EINVAL;
1599 break;
1600 }
1601 OPTSET(IN6P_IPV6_V6ONLY);
1602 if (optval)
1603 in6p->in6p_vflag &= ~INP_IPV4;
1604 else
1605 in6p->in6p_vflag |= INP_IPV4;
1606 break;
1607 }
1608 break;
1609
1610 case IPV6_TCLASS:
1611 case IPV6_DONTFRAG:
1612 case IPV6_USE_MIN_MTU:
1613 case IPV6_PREFER_TEMPADDR:
1614 if (optlen != sizeof(optval)) {
1615 error = EINVAL;
1616 break;
1617 }
1618 error = soopt_to_kbuf(sopt, &optval,
1619 sizeof optval, sizeof optval);
1620 if (error)
1621 break;
1622 {
1623 struct ip6_pktopts **optp;
1624 optp = &in6p->in6p_outputopts;
1625 error = ip6_pcbopt(optname,
1626 (u_char *)&optval, sizeof(optval),
1627 optp, uproto);
1628 break;
1629 }
1630
1631 case IPV6_2292PKTINFO:
1632 case IPV6_2292HOPLIMIT:
1633 case IPV6_2292HOPOPTS:
1634 case IPV6_2292DSTOPTS:
1635 case IPV6_2292RTHDR:
1636 /* RFC 2292 */
1637 if (optlen != sizeof(int)) {
1638 error = EINVAL;
1639 break;
1640 }
1641 error = soopt_to_kbuf(sopt, &optval,
1642 sizeof optval, sizeof optval);
1643 if (error)
1644 break;
1645 switch (optname) {
1646 case IPV6_2292PKTINFO:
1647 OPTSET2292(IN6P_PKTINFO);
1648 break;
1649 case IPV6_2292HOPLIMIT:
1650 OPTSET2292(IN6P_HOPLIMIT);
1651 break;
1652 case IPV6_2292HOPOPTS:
1653 /*
1654 * Check super-user privilege.
1655 * See comments for IPV6_RECVHOPOPTS.
1656 */
1657 if (!privileged)
1658 return (EPERM);
1659 OPTSET2292(IN6P_HOPOPTS);
1660 break;
1661 case IPV6_2292DSTOPTS:
1662 if (!privileged)
1663 return (EPERM);
1664 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1665 break;
1666 case IPV6_2292RTHDR:
1667 OPTSET2292(IN6P_RTHDR);
1668 break;
1669 }
1670 break;
1671
1672 case IPV6_PKTINFO:
1673 case IPV6_HOPOPTS:
1674 case IPV6_RTHDR:
1675 case IPV6_DSTOPTS:
1676 case IPV6_RTHDRDSTOPTS:
1677 case IPV6_NEXTHOP:
1678 {
1679 /*
1680 * New advanced API (RFC3542)
1681 */
1682 u_char *optbuf;
1683 u_char optbuf_storage[MCLBYTES];
1684 int optlen;
1685 struct ip6_pktopts **optp;
1686
1687 /* cannot mix with RFC2292 */
1688 if (OPTBIT(IN6P_RFC2292)) {
1689 error = EINVAL;
1690 break;
1691 }
1692
1693 /*
1694 * We only ensure valsize is not too large
1695 * here. Further validation will be done
1696 * later.
1697 */
1698 error = soopt_to_kbuf(sopt, optbuf_storage,
1699 sizeof(optbuf_storage), 0);
1700 if (error)
1701 break;
1702 optlen = sopt->sopt_valsize;
1703 optbuf = optbuf_storage;
1704 optp = &in6p->in6p_outputopts;
1705 error = ip6_pcbopt(optname, optbuf, optlen,
1706 optp, uproto);
1707 break;
1708 }
1709 #undef OPTSET
1710
1711 case IPV6_MULTICAST_IF:
1712 case IPV6_MULTICAST_HOPS:
1713 case IPV6_MULTICAST_LOOP:
1714 case IPV6_JOIN_GROUP:
1715 case IPV6_LEAVE_GROUP:
1716 {
1717 struct mbuf *m;
1718 if (sopt->sopt_valsize > MLEN) {
1719 error = EMSGSIZE;
1720 break;
1721 }
1722 /* XXX */
1723 MGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_HEADER);
1724 if (m == NULL) {
1725 error = ENOBUFS;
1726 break;
1727 }
1728 m->m_len = sopt->sopt_valsize;
1729 error = soopt_to_kbuf(sopt, mtod(m, char *),
1730 m->m_len, m->m_len);
1731 error = ip6_setmoptions(sopt->sopt_name,
1732 &in6p->in6p_moptions,
1733 m);
1734 m_free(m);
1735 }
1736 break;
1737
1738 case IPV6_PORTRANGE:
1739 error = soopt_to_kbuf(sopt, &optval,
1740 sizeof optval, sizeof optval);
1741 if (error)
1742 break;
1743
1744 switch (optval) {
1745 case IPV6_PORTRANGE_DEFAULT:
1746 in6p->in6p_flags &= ~(IN6P_LOWPORT);
1747 in6p->in6p_flags &= ~(IN6P_HIGHPORT);
1748 break;
1749
1750 case IPV6_PORTRANGE_HIGH:
1751 in6p->in6p_flags &= ~(IN6P_LOWPORT);
1752 in6p->in6p_flags |= IN6P_HIGHPORT;
1753 break;
1754
1755 case IPV6_PORTRANGE_LOW:
1756 in6p->in6p_flags &= ~(IN6P_HIGHPORT);
1757 in6p->in6p_flags |= IN6P_LOWPORT;
1758 break;
1759
1760 default:
1761 error = EINVAL;
1762 break;
1763 }
1764 break;
1765
1766 #if defined(IPSEC) || defined(FAST_IPSEC)
1767 case IPV6_IPSEC_POLICY:
1768 {
1769 caddr_t req = NULL;
1770 size_t len = 0;
1771 struct mbuf *m;
1772
1773 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1774 break;
1775 soopt_to_mbuf(sopt, m); /* XXX */
1776 if (m) {
1777 req = mtod(m, caddr_t);
1778 len = m->m_len;
1779 }
1780 error = ipsec6_set_policy(in6p, optname, req,
1781 len, privileged);
1782 m_freem(m);
1783 }
1784 break;
1785 #endif /* KAME IPSEC */
1786
1787 case IPV6_FW_ADD:
1788 case IPV6_FW_DEL:
1789 case IPV6_FW_FLUSH:
1790 case IPV6_FW_ZERO:
1791 {
1792 struct mbuf *m;
1793 struct mbuf **mp = &m;
1794
1795 if (ip6_fw_ctl_ptr == NULL)
1796 return EINVAL;
1797 /* XXX */
1798 if ((error = soopt_getm(sopt, &m)) != 0)
1799 break;
1800 /* XXX */
1801 soopt_to_mbuf(sopt, m);
1802 error = (*ip6_fw_ctl_ptr)(optname, mp);
1803 m = *mp;
1804 }
1805 break;
1806
1807 default:
1808 error = ENOPROTOOPT;
1809 break;
1810 }
1811 break;
1812
1813 case SOPT_GET:
1814 switch (optname) {
1815 case IPV6_2292PKTOPTIONS:
1816 #ifdef IPV6_PKTOPTIONS
1817 case IPV6_PKTOPTIONS:
1818 #endif
1819 /*
1820 * RFC3542 (effectively) deprecated the
1821 * semantics of the 2292-style pktoptions.
1822 * Since it was not reliable in nature (i.e.,
1823 * applications had to expect the lack of some
1824 * information after all), it would make sense
1825 * to simplify this part by always returning
1826 * empty data.
1827 */
1828 if (in6p->in6p_options) {
1829 struct mbuf *m;
1830 m = m_copym(in6p->in6p_options,
1831 0, M_COPYALL, MB_WAIT);
1832 error = soopt_from_mbuf(sopt, m);
1833 if (error == 0)
1834 m_freem(m);
1835 } else
1836 sopt->sopt_valsize = 0;
1837 break;
1838
1839 case IPV6_RECVHOPOPTS:
1840 case IPV6_RECVDSTOPTS:
1841 case IPV6_RECVRTHDRDSTOPTS:
1842 case IPV6_UNICAST_HOPS:
1843 case IPV6_RECVPKTINFO:
1844 case IPV6_RECVHOPLIMIT:
1845 case IPV6_RECVRTHDR:
1846 case IPV6_RECVPATHMTU:
1847 case IPV6_RECVTCLASS:
1848 case IPV6_AUTOFLOWLABEL:
1849 case IPV6_FAITH:
1850 case IPV6_V6ONLY:
1851 case IPV6_PORTRANGE:
1852 switch (optname) {
1853
1854 case IPV6_RECVHOPOPTS:
1855 optval = OPTBIT(IN6P_HOPOPTS);
1856 break;
1857
1858 case IPV6_RECVDSTOPTS:
1859 optval = OPTBIT(IN6P_DSTOPTS);
1860 break;
1861
1862 case IPV6_RECVRTHDRDSTOPTS:
1863 optval = OPTBIT(IN6P_RTHDRDSTOPTS);
1864 break;
1865
1866 case IPV6_RECVPKTINFO:
1867 optval = OPTBIT(IN6P_PKTINFO);
1868 break;
1869
1870 case IPV6_RECVHOPLIMIT:
1871 optval = OPTBIT(IN6P_HOPLIMIT);
1872 break;
1873
1874 case IPV6_RECVRTHDR:
1875 optval = OPTBIT(IN6P_RTHDR);
1876 break;
1877
1878 case IPV6_RECVPATHMTU:
1879 optval = OPTBIT(IN6P_MTU);
1880 break;
1881
1882 case IPV6_RECVTCLASS:
1883 optval = OPTBIT(IN6P_TCLASS);
1884 break;
1885
1886 case IPV6_AUTOFLOWLABEL:
1887 optval = OPTBIT(IN6P_AUTOFLOWLABEL);
1888 break;
1889
1890
1891 case IPV6_UNICAST_HOPS:
1892 optval = in6p->in6p_hops;
1893 break;
1894
1895 case IPV6_FAITH:
1896 optval = OPTBIT(IN6P_FAITH);
1897 break;
1898
1899 case IPV6_V6ONLY:
1900 optval = OPTBIT(IN6P_IPV6_V6ONLY);
1901 break;
1902
1903 case IPV6_PORTRANGE:
1904 {
1905 int flags;
1906 flags = in6p->in6p_flags;
1907 if (flags & IN6P_HIGHPORT)
1908 optval = IPV6_PORTRANGE_HIGH;
1909 else if (flags & IN6P_LOWPORT)
1910 optval = IPV6_PORTRANGE_LOW;
1911 else
1912 optval = 0;
1913 break;
1914 }
1915 }
1916 soopt_from_kbuf(sopt, &optval,
1917 sizeof optval);
1918 break;
1919
1920 case IPV6_PATHMTU:
1921 {
1922 u_long pmtu = 0;
1923 struct ip6_mtuinfo mtuinfo;
1924 struct route_in6 sro;
1925
1926 bzero(&sro, sizeof(sro));
1927
1928 if (!(so->so_state & SS_ISCONNECTED))
1929 return (ENOTCONN);
1930 /*
1931 * XXX: we dot not consider the case of source
1932 * routing, or optional information to specify
1933 * the outgoing interface.
1934 */
1935 error = ip6_getpmtu(&sro, NULL, NULL,
1936 &in6p->in6p_faddr, &pmtu, NULL);
1937 if (sro.ro_rt)
1938 RTFREE(sro.ro_rt);
1939 if (error)
1940 break;
1941 if (pmtu > IPV6_MAXPACKET)
1942 pmtu = IPV6_MAXPACKET;
1943
1944 bzero(&mtuinfo, sizeof(mtuinfo));
1945 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
1946 optdata = (void *)&mtuinfo;
1947 optdatalen = sizeof(mtuinfo);
1948 soopt_from_kbuf(sopt, optdata,
1949 optdatalen);
1950 break;
1951 }
1952
1953 case IPV6_2292PKTINFO:
1954 case IPV6_2292HOPLIMIT:
1955 case IPV6_2292HOPOPTS:
1956 case IPV6_2292RTHDR:
1957 case IPV6_2292DSTOPTS:
1958 if (optname == IPV6_2292HOPOPTS ||
1959 optname == IPV6_2292DSTOPTS ||
1960 !privileged)
1961 return (EPERM);
1962 switch (optname) {
1963 case IPV6_2292PKTINFO:
1964 optval = OPTBIT(IN6P_PKTINFO);
1965 break;
1966 case IPV6_2292HOPLIMIT:
1967 optval = OPTBIT(IN6P_HOPLIMIT);
1968 break;
1969 case IPV6_2292HOPOPTS:
1970 if (!privileged)
1971 return (EPERM);
1972 optval = OPTBIT(IN6P_HOPOPTS);
1973 break;
1974 case IPV6_2292RTHDR:
1975 optval = OPTBIT(IN6P_RTHDR);
1976 break;
1977 case IPV6_2292DSTOPTS:
1978 if (!privileged)
1979 return (EPERM);
1980 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
1981 break;
1982 }
1983 soopt_from_kbuf(sopt, &optval,
1984 sizeof optval);
1985 break;
1986
1987 case IPV6_PKTINFO:
1988 case IPV6_HOPOPTS:
1989 case IPV6_RTHDR:
1990 case IPV6_DSTOPTS:
1991 case IPV6_RTHDRDSTOPTS:
1992 case IPV6_NEXTHOP:
1993 case IPV6_TCLASS:
1994 case IPV6_DONTFRAG:
1995 case IPV6_USE_MIN_MTU:
1996 case IPV6_PREFER_TEMPADDR:
1997 error = ip6_getpcbopt(in6p->in6p_outputopts,
1998 optname, sopt);
1999 break;
2000
2001 case IPV6_MULTICAST_IF:
2002 case IPV6_MULTICAST_HOPS:
2003 case IPV6_MULTICAST_LOOP:
2004 case IPV6_JOIN_GROUP:
2005 case IPV6_LEAVE_GROUP:
2006 {
2007 struct mbuf *m;
2008 error = ip6_getmoptions(sopt->sopt_name,
2009 in6p->in6p_moptions, &m);
2010 if (error == 0)
2011 soopt_from_kbuf(sopt,
2012 mtod(m, char *), m->m_len);
2013 m_freem(m);
2014 }
2015 break;
2016
2017 #if defined(IPSEC) || defined(FAST_IPSEC)
2018 case IPV6_IPSEC_POLICY:
2019 {
2020 caddr_t req = NULL;
2021 size_t len = 0;
2022 struct mbuf *m = NULL;
2023 struct mbuf **mp = &m;
2024
2025 error = soopt_getm(sopt, &m); /* XXX */
2026 if (error != 0)
2027 break;
2028 soopt_to_mbuf(sopt, m); /* XXX */
2029 if (m) {
2030 req = mtod(m, caddr_t);
2031 len = m->m_len;
2032 }
2033 error = ipsec6_get_policy(in6p, req, len, mp);
2034 if (error == 0)
2035 error = soopt_from_mbuf(sopt, m); /*XXX*/
2036 if (error == 0 && m != NULL)
2037 m_freem(m);
2038 break;
2039 }
2040 #endif /* KAME IPSEC */
2041
2042 case IPV6_FW_GET:
2043 {
2044 struct mbuf *m;
2045 struct mbuf **mp = &m;
2046
2047 if (ip6_fw_ctl_ptr == NULL)
2048 {
2049 return EINVAL;
2050 }
2051 error = (*ip6_fw_ctl_ptr)(optname, mp);
2052 if (error == 0)
2053 error = soopt_from_mbuf(sopt, m); /* XXX */
2054 if (error == 0 && m != NULL)
2055 m_freem(m);
2056 }
2057 break;
2058
2059 default:
2060 error = ENOPROTOOPT;
2061 break;
2062 }
2063 break;
2064 }
2065 } else {
2066 error = EINVAL;
2067 }
2068 return (error);
2069 }
2070
2071 int
2072 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2073 {
2074 int error = 0, optval, optlen;
2075 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2076 struct in6pcb *in6p = sotoin6pcb(so);
2077 int level, op, optname;
2078
2079 if (sopt) {
2080 level = sopt->sopt_level;
2081 op = sopt->sopt_dir;
2082 optname = sopt->sopt_name;
2083 optlen = sopt->sopt_valsize;
2084 } else
2085 panic("ip6_raw_ctloutput: arg soopt is NULL");
2086
2087 if (level != IPPROTO_IPV6) {
2088 return (EINVAL);
2089 }
2090
2091 switch (optname) {
2092 case IPV6_CHECKSUM:
2093 /*
2094 * For ICMPv6 sockets, no modification allowed for checksum
2095 * offset, permit "no change" values to help existing apps.
2096 *
2097 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2098 * for an ICMPv6 socket will fail."
2099 * The current behavior does not meet RFC3542.
2100 */
2101 switch (op) {
2102 case SOPT_SET:
2103 if (optlen != sizeof(int)) {
2104 error = EINVAL;
2105 break;
2106 }
2107 error = soopt_to_kbuf(sopt, &optval,
2108 sizeof optval, sizeof optval);
2109 if (error)
2110 break;
2111 if ((optval % 2) != 0) {
2112 /* the API assumes even offset values */
2113 error = EINVAL;
2114 } else if (so->so_proto->pr_protocol ==
2115 IPPROTO_ICMPV6) {
2116 if (optval != icmp6off)
2117 error = EINVAL;
2118 } else
2119 in6p->in6p_cksum = optval;
2120 break;
2121
2122 case SOPT_GET:
2123 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
2124 optval = icmp6off;
2125 else
2126 optval = in6p->in6p_cksum;
2127
2128 soopt_from_kbuf(sopt, &optval, sizeof(optval));
2129 break;
2130
2131 default:
2132 error = EINVAL;
2133 break;
2134 }
2135 break;
2136
2137 default:
2138 error = ENOPROTOOPT;
2139 break;
2140 }
2141
2142 return (error);
2143 }
2144
2145 /*
2146 * Set up IP6 options in pcb for insertion in output packets or
2147 * specifying behavior of outgoing packets.
2148 */
2149 static int
2150 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2151 struct socket *so, struct sockopt *sopt)
2152 {
2153 int priv = 0;
2154 struct ip6_pktopts *opt = *pktopt;
2155 int error = 0;
2156
2157 /* turn off any old options. */
2158 if (opt) {
2159 #ifdef DIAGNOSTIC
2160 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2161 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2162 opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2163 kprintf("ip6_pcbopts: all specified options are cleared.\n");
2164 #endif
2165 ip6_clearpktopts(opt, -1);
2166 } else
2167 opt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2168 *pktopt = NULL;
2169
2170 if (!m || m->m_len == 0) {
2171 /*
2172 * Only turning off any previous options, regardless of
2173 * whether the opt is just created or given.
2174 */
2175 kfree(opt, M_IP6OPT);
2176 return (0);
2177 }
2178
2179 /* set options specified by user. */
2180 if ((error = ip6_setpktoptions(m, opt, NULL, so->so_proto->pr_protocol, priv)) != 0) {
2181 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2182 kfree(opt, M_IP6OPT);
2183 return (error);
2184 }
2185 *pktopt = opt;
2186 return (0);
2187 }
2188
2189
2190 /*
2191 * Below three functions are introduced by merge to RFC3542
2192 */
2193
2194 static int
2195 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt)
2196 {
2197 void *optdata = NULL;
2198 int optdatalen = 0;
2199 struct ip6_ext *ip6e;
2200 int error = 0;
2201 struct in6_pktinfo null_pktinfo;
2202 int deftclass = 0, on;
2203 int defminmtu = IP6PO_MINMTU_MCASTONLY;
2204 int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2205
2206 switch (optname) {
2207 case IPV6_PKTINFO:
2208 if (pktopt && pktopt->ip6po_pktinfo)
2209 optdata = (void *)pktopt->ip6po_pktinfo;
2210 else {
2211 /* XXX: we don't have to do this every time... */
2212 bzero(&null_pktinfo, sizeof(null_pktinfo));
2213 optdata = (void *)&null_pktinfo;
2214 }
2215 optdatalen = sizeof(struct in6_pktinfo);
2216 break;
2217 case IPV6_TCLASS:
2218 if (pktopt && pktopt->ip6po_tclass >= 0)
2219 optdata = (void *)&pktopt->ip6po_tclass;
2220 else
2221 optdata = (void *)&deftclass;
2222 optdatalen = sizeof(int);
2223 break;
2224 case IPV6_HOPOPTS:
2225 if (pktopt && pktopt->ip6po_hbh) {
2226 optdata = (void *)pktopt->ip6po_hbh;
2227 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
2228 optdatalen = (ip6e->ip6e_len + 1) << 3;
2229 }
2230 break;
2231 case IPV6_RTHDR:
2232 if (pktopt && pktopt->ip6po_rthdr) {
2233 optdata = (void *)pktopt->ip6po_rthdr;
2234 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
2235 optdatalen = (ip6e->ip6e_len + 1) << 3;
2236 }
2237 break;
2238 case IPV6_RTHDRDSTOPTS:
2239 if (pktopt && pktopt->ip6po_dest1) {
2240 optdata = (void *)pktopt->ip6po_dest1;
2241 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
2242 optdatalen = (ip6e->ip6e_len + 1) << 3;
2243 }
2244 break;
2245 case IPV6_DSTOPTS:
2246 if (pktopt && pktopt->ip6po_dest2) {
2247 optdata = (void *)pktopt->ip6po_dest2;
2248 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
2249 optdatalen = (ip6e->ip6e_len + 1) << 3;
2250 }
2251 break;
2252 case IPV6_NEXTHOP:
2253 if (pktopt && pktopt->ip6po_nexthop) {
2254 optdata = (void *)pktopt->ip6po_nexthop;
2255 optdatalen = pktopt->ip6po_nexthop->sa_len;
2256 }
2257 break;
2258 case IPV6_USE_MIN_MTU:
2259 if (pktopt)
2260 optdata = (void *)&pktopt->ip6po_minmtu;
2261 else
2262 optdata = (void *)&defminmtu;
2263 optdatalen = sizeof(int);
2264 break;
2265 case IPV6_DONTFRAG:
2266 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2267 on = 1;
2268 else
2269 on = 0;
2270 optdata = (void *)&on;
2271 optdatalen = sizeof(on);
2272 break;
2273 case IPV6_PREFER_TEMPADDR:
2274 if (pktopt)
2275 optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
2276 else
2277 optdata = (void *)&defpreftemp;
2278 optdatalen = sizeof(int);
2279 break;
2280 default: /* should not happen */
2281 #ifdef DIAGNOSTIC
2282 panic("ip6_getpcbopt: unexpected option");
2283 #endif
2284 return (ENOPROTOOPT);
2285 }
2286
2287 soopt_from_kbuf(sopt, optdata, optdatalen);
2288
2289 return (error);
2290 }
2291
2292 /*
2293 * initialize ip6_pktopts. beware that there are non-zero default values in
2294 * the struct.
2295 */
2296
2297 static int
2298 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, int uproto)
2299 {
2300 struct ip6_pktopts *opt;
2301 int priv =0;
2302 if (*pktopt == NULL) {
2303 *pktopt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2304 init_ip6pktopts(*pktopt);
2305 }
2306 opt = *pktopt;
2307
2308 return (ip6_setpktoption(optname, buf, len, opt, 1, 0, uproto, priv));
2309 }
2310
2311 /*
2312 * initialize ip6_pktopts. beware that there are non-zero default values in
2313 * the struct.
2314 */
2315 void
2316 init_ip6pktopts(struct ip6_pktopts *opt)
2317 {
2318
2319 bzero(opt, sizeof(*opt));
2320 opt->ip6po_hlim = -1; /* -1 means default hop limit */
2321 opt->ip6po_tclass = -1; /* -1 means default traffic class */
2322 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2323 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2324 }
2325
2326 void
2327 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2328 {
2329 if (pktopt == NULL)
2330 return;
2331
2332 if (optname == -1 || optname == IPV6_PKTINFO) {
2333 if (pktopt->ip6po_pktinfo)
2334 kfree(pktopt->ip6po_pktinfo, M_IP6OPT);
2335 pktopt->ip6po_pktinfo = NULL;
2336 }
2337 if (optname == -1 || optname == IPV6_HOPLIMIT)
2338 pktopt->ip6po_hlim = -1;
2339 if (optname == -1 || optname == IPV6_TCLASS)
2340 pktopt->ip6po_tclass = -1;
2341 if (optname == -1 || optname == IPV6_NEXTHOP) {
2342 if (pktopt->ip6po_nextroute.ro_rt) {
2343 RTFREE(pktopt->ip6po_nextroute.ro_rt);
2344 pktopt->ip6po_nextroute.ro_rt = NULL;
2345 }
2346 if (pktopt->ip6po_nexthop)
2347 kfree(pktopt->ip6po_nexthop, M_IP6OPT);
2348 pktopt->ip6po_nexthop = NULL;
2349 }
2350 if (optname == -1 || optname == IPV6_HOPOPTS) {
2351 if (pktopt->ip6po_hbh)
2352 kfree(pktopt->ip6po_hbh, M_IP6OPT);
2353 pktopt->ip6po_hbh = NULL;
2354 }
2355 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2356 if (pktopt->ip6po_dest1)
2357 kfree(pktopt->ip6po_dest1, M_IP6OPT);
2358 pktopt->ip6po_dest1 = NULL;
2359 }
2360 if (optname == -1 || optname == IPV6_RTHDR) {
2361 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2362 kfree(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2363 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2364 if (pktopt->ip6po_route.ro_rt) {
2365 RTFREE(pktopt->ip6po_route.ro_rt);
2366 pktopt->ip6po_route.ro_rt = NULL;
2367 }
2368 }
2369 if (optname == -1 || optname == IPV6_DSTOPTS) {
2370 if (pktopt->ip6po_dest2)
2371 kfree(pktopt->ip6po_dest2, M_IP6OPT);
2372 pktopt->ip6po_dest2 = NULL;
2373 }
2374 }
2375
2376 #define PKTOPT_EXTHDRCPY(type) \
2377 do {\
2378 if (src->type) {\
2379 int hlen =\
2380 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2381 dst->type = kmalloc(hlen, M_IP6OPT, canwait);\
2382 if (dst->type == NULL)\
2383 goto bad;\
2384 bcopy(src->type, dst->type, hlen);\
2385 }\
2386 } while (0)
2387
2388 struct ip6_pktopts *
2389 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2390 {
2391 struct ip6_pktopts *dst;
2392
2393 if (src == NULL) {
2394 kprintf("ip6_clearpktopts: invalid argument\n");
2395 return (NULL);
2396 }
2397
2398 dst = kmalloc(sizeof(*dst), M_IP6OPT, canwait | M_ZERO);
2399 if (dst == NULL)
2400 return (NULL);
2401
2402 dst->ip6po_hlim = src->ip6po_hlim;
2403 if (src->ip6po_pktinfo) {
2404 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo),
2405 M_IP6OPT, canwait);
2406 if (dst->ip6po_pktinfo == NULL)
2407 goto bad;
2408 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2409 }
2410 if (src->ip6po_nexthop) {
2411 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len,
2412 M_IP6OPT, canwait);
2413 if (dst->ip6po_nexthop == NULL)
2414 goto bad;
2415 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2416 src->ip6po_nexthop->sa_len);
2417 }
2418 PKTOPT_EXTHDRCPY(ip6po_hbh);
2419 PKTOPT_EXTHDRCPY(ip6po_dest1);
2420 PKTOPT_EXTHDRCPY(ip6po_dest2);
2421 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2422 return (dst);
2423
2424 bad:
2425 if (dst->ip6po_pktinfo) kfree(dst->ip6po_pktinfo, M_IP6OPT);
2426 if (dst->ip6po_nexthop) kfree(dst->ip6po_nexthop, M_IP6OPT);
2427 if (dst->ip6po_hbh) kfree(dst->ip6po_hbh, M_IP6OPT);
2428 if (dst->ip6po_dest1) kfree(dst->ip6po_dest1, M_IP6OPT);
2429 if (dst->ip6po_dest2) kfree(dst->ip6po_dest2, M_IP6OPT);
2430 if (dst->ip6po_rthdr) kfree(dst->ip6po_rthdr, M_IP6OPT);
2431 kfree(dst, M_IP6OPT);
2432 return (NULL);
2433 }
2434
2435 static int
2436 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2437 {
2438 if (dst == NULL || src == NULL) {
2439 #ifdef DIAGNOSTIC
2440 kprintf("ip6_clearpktopts: invalid argument\n");
2441 #endif
2442 return (EINVAL);
2443 }
2444
2445 dst->ip6po_hlim = src->ip6po_hlim;
2446 dst->ip6po_tclass = src->ip6po_tclass;
2447 dst->ip6po_flags = src->ip6po_flags;
2448 if (src->ip6po_pktinfo) {
2449 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo),
2450 M_IP6OPT, canwait);
2451 if (dst->ip6po_pktinfo == NULL)
2452 goto bad;
2453 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2454 }
2455 if (src->ip6po_nexthop) {
2456 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len,
2457 M_IP6OPT, canwait);
2458 if (dst->ip6po_nexthop == NULL)
2459 goto bad;
2460 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2461 src->ip6po_nexthop->sa_len);
2462 }
2463 PKTOPT_EXTHDRCPY(ip6po_hbh);
2464 PKTOPT_EXTHDRCPY(ip6po_dest1);
2465 PKTOPT_EXTHDRCPY(ip6po_dest2);
2466 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2467 return (0);
2468
2469 bad:
2470 ip6_clearpktopts(dst, -1);
2471 return (ENOBUFS);
2472 }
2473 #undef PKTOPT_EXTHDRCPY
2474
2475 void
2476 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2477 {
2478 if (pktopt == NULL)
2479 return;
2480
2481 ip6_clearpktopts(pktopt, -1);
2482
2483 kfree(pktopt, M_IP6OPT);
2484 }
2485
2486 /*
2487 * Set the IP6 multicast options in response to user setsockopt().
2488 */
2489 static int
2490 ip6_setmoptions(int optname, struct ip6_moptions **im6op, struct mbuf *m)
2491 {
2492 int error = 0;
2493 u_int loop, ifindex;
2494 struct ipv6_mreq *mreq;
2495 struct ifnet *ifp;
2496 struct ip6_moptions *im6o = *im6op;
2497 struct route_in6 ro;
2498 struct sockaddr_in6 *dst;
2499 struct in6_multi_mship *imm;
2500 struct thread *td = curthread; /* XXX */
2501
2502 if (im6o == NULL) {
2503 /*
2504 * No multicast option buffer attached to the pcb;
2505 * allocate one and initialize to default values.
2506 */
2507 im6o = (struct ip6_moptions *)
2508 kmalloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK);
2509
2510 *im6op = im6o;
2511 im6o->im6o_multicast_ifp = NULL;
2512 im6o->im6o_multicast_hlim = ip6_defmcasthlim;
2513 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP;
2514 LIST_INIT(&im6o->im6o_memberships);
2515 }
2516
2517 switch (optname) {
2518
2519 case IPV6_MULTICAST_IF:
2520 /*
2521 * Select the interface for outgoing multicast packets.
2522 */
2523 if (m == NULL || m->m_len != sizeof(u_int)) {
2524 error = EINVAL;
2525 break;
2526 }
2527 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex));
2528 if (ifindex < 0 || if_index < ifindex) {
2529 error = ENXIO; /* XXX EINVAL? */
2530 break;
2531 }
2532 ifp = ifindex2ifnet[ifindex];
2533 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) {
2534 error = EADDRNOTAVAIL;
2535 break;
2536 }
2537 im6o->im6o_multicast_ifp = ifp;
2538 break;
2539
2540 case IPV6_MULTICAST_HOPS:
2541 {
2542 /*
2543 * Set the IP6 hoplimit for outgoing multicast packets.
2544 */
2545 int optval;
2546 if (m == NULL || m->m_len != sizeof(int)) {
2547 error = EINVAL;
2548 break;
2549 }
2550 bcopy(mtod(m, u_int *), &optval, sizeof(optval));
2551 if (optval < -1 || optval >= 256)
2552 error = EINVAL;
2553 else if (optval == -1)
2554 im6o->im6o_multicast_hlim = ip6_defmcasthlim;
2555 else
2556 im6o->im6o_multicast_hlim = optval;
2557 break;
2558 }
2559
2560 case IPV6_MULTICAST_LOOP:
2561 /*
2562 * Set the loopback flag for outgoing multicast packets.
2563 * Must be zero or one.
2564 */
2565 if (m == NULL || m->m_len != sizeof(u_int)) {
2566 error = EINVAL;
2567 break;
2568 }
2569 bcopy(mtod(m, u_int *), &loop, sizeof(loop));
2570 if (loop > 1) {
2571 error = EINVAL;
2572 break;
2573 }
2574 im6o->im6o_multicast_loop = loop;
2575 break;
2576
2577 case IPV6_JOIN_GROUP:
2578 /*
2579 * Add a multicast group membership.
2580 * Group must be a valid IP6 multicast address.
2581 */
2582 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) {
2583 error = EINVAL;
2584 break;
2585 }
2586 mreq = mtod(m, struct ipv6_mreq *);
2587 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) {
2588 /*
2589 * We use the unspecified address to specify to accept
2590 * all multicast addresses. Only super user is allowed
2591 * to do this.
2592 */
2593 if (priv_check(td, PRIV_ROOT))
2594 {
2595 error = EACCES;
2596 break;
2597 }
2598 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) {
2599 error = EINVAL;
2600 break;
2601 }
2602
2603 /*
2604 * If the interface is specified, validate it.
2605 */
2606 if (mreq->ipv6mr_interface < 0
2607 || if_index < mreq->ipv6mr_interface) {
2608 error = ENXIO; /* XXX EINVAL? */
2609 break;
2610 }
2611 /*
2612 * If no interface was explicitly specified, choose an
2613 * appropriate one according to the given multicast address.
2614 */
2615 if (mreq->ipv6mr_interface == 0) {
2616 /*
2617 * If the multicast address is in node-local scope,
2618 * the interface should be a loopback interface.
2619 * Otherwise, look up the routing table for the
2620 * address, and choose the outgoing interface.
2621 * XXX: is it a good approach?
2622 */
2623 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) {
2624 ifp = &loif[0];
2625 } else {
2626 ro.ro_rt = NULL;
2627 dst = (struct sockaddr_in6 *)&ro.ro_dst;
2628 bzero(dst, sizeof(*dst));
2629 dst->sin6_len = sizeof(struct sockaddr_in6);
2630 dst->sin6_family = AF_INET6;
2631 dst->sin6_addr = mreq->ipv6mr_multiaddr;
2632 rtalloc((struct route *)&ro);
2633 if (ro.ro_rt == NULL) {
2634 error = EADDRNOTAVAIL;
2635 break;
2636 }
2637 ifp = ro.ro_rt->rt_ifp;
2638 rtfree(ro.ro_rt);
2639 }
2640 } else
2641 ifp = ifindex2ifnet[mreq->ipv6mr_interface];
2642
2643 /*
2644 * See if we found an interface, and confirm that it
2645 * supports multicast
2646 */
2647 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) {
2648 error = EADDRNOTAVAIL;
2649 break;
2650 }
2651 /*
2652 * Put interface index into the multicast address,
2653 * if the address has link-local scope.
2654 */
2655 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) {
2656 mreq->ipv6mr_multiaddr.s6_addr16[1]
2657 = htons(mreq->ipv6mr_interface);
2658 }
2659 /*
2660 * See if the membership already exists.
2661 */
2662 for (imm = im6o->im6o_memberships.lh_first;
2663 imm != NULL; imm = imm->i6mm_chain.le_next)
2664 if (imm->i6mm_maddr->in6m_ifp == ifp &&
2665 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
2666 &mreq->ipv6mr_multiaddr))
2667 break;
2668 if (imm != NULL) {
2669 error = EADDRINUSE;
2670 break;
2671 }
2672 /*
2673 * Everything looks good; add a new record to the multicast
2674 * address list for the given interface.
2675 */
2676 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_WAITOK);
2677 if ((imm->i6mm_maddr =
2678 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) {
2679 kfree(imm, M_IPMADDR);
2680 break;
2681 }
2682 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
2683 break;
2684
2685 case IPV6_LEAVE_GROUP:
2686 /*
2687 * Drop a multicast group membership.
2688 * Group must be a valid IP6 multicast address.
2689 */
2690 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) {
2691 error = EINVAL;
2692 break;
2693 }
2694 mreq = mtod(m, struct ipv6_mreq *);
2695 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) {
2696 if (priv_check(td, PRIV_ROOT)) {
2697 error = EACCES;
2698 break;
2699 }
2700 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) {
2701 error = EINVAL;
2702 break;
2703 }
2704 /*
2705 * If an interface address was specified, get a pointer
2706 * to its ifnet structure.
2707 */
2708 if (mreq->ipv6mr_interface < 0
2709 || if_index < mreq->ipv6mr_interface) {
2710 error = ENXIO; /* XXX EINVAL? */
2711 break;
2712 }
2713 ifp = ifindex2ifnet[mreq->ipv6mr_interface];
2714 /*
2715 * Put interface index into the multicast address,
2716 * if the address has link-local scope.
2717 */
2718 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) {
2719 mreq->ipv6mr_multiaddr.s6_addr16[1]
2720 = htons(mreq->ipv6mr_interface);
2721 }
2722 /*
2723 * Find the membership in the membership list.
2724 */
2725 for (imm = im6o->im6o_memberships.lh_first;
2726 imm != NULL; imm = imm->i6mm_chain.le_next) {
2727 if ((ifp == NULL ||
2728 imm->i6mm_maddr->in6m_ifp == ifp) &&
2729 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
2730 &mreq->ipv6mr_multiaddr))
2731 break;
2732 }
2733 if (imm == NULL) {
2734 /* Unable to resolve interface */
2735 error = EADDRNOTAVAIL;
2736 break;
2737 }
2738 /*
2739 * Give up the multicast address record to which the
2740 * membership points.
2741 */
2742 LIST_REMOVE(imm, i6mm_chain);
2743 in6_delmulti(imm->i6mm_maddr);
2744 kfree(imm, M_IPMADDR);
2745 break;
2746
2747 default:
2748 error = EOPNOTSUPP;
2749 break;
2750 }
2751
2752 /*
2753 * If all options have default values, no need to keep the mbuf.
2754 */
2755 if (im6o->im6o_multicast_ifp == NULL &&
2756 im6o->im6o_multicast_hlim == ip6_defmcasthlim &&
2757 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP &&
2758 im6o->im6o_memberships.lh_first == NULL) {
2759 kfree(*im6op, M_IPMOPTS);
2760 *im6op = NULL;
2761 }
2762
2763 return (error);
2764 }
2765
2766 /*
2767 * Return the IP6 multicast options in response to user getsockopt().
2768 */
2769 static int
2770 ip6_getmoptions(int optname, struct ip6_moptions *im6o, struct mbuf **mp)
2771 {
2772 u_int *hlim, *loop, *ifindex;
2773
2774 *mp = m_get(MB_WAIT, MT_HEADER); /* XXX */
2775
2776 switch (optname) {
2777
2778 case IPV6_MULTICAST_IF:
2779 ifindex = mtod(*mp, u_int *);
2780 (*mp)->m_len = sizeof(u_int);
2781 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL)
2782 *ifindex = 0;
2783 else
2784 *ifindex = im6o->im6o_multicast_ifp->if_index;
2785 return (0);
2786
2787 case IPV6_MULTICAST_HOPS:
2788 hlim = mtod(*mp, u_int *);
2789 (*mp)->m_len = sizeof(u_int);
2790 if (im6o == NULL)
2791 *hlim = ip6_defmcasthlim;
2792 else
2793 *hlim = im6o->im6o_multicast_hlim;
2794 return (0);
2795
2796 case IPV6_MULTICAST_LOOP:
2797 loop = mtod(*mp, u_int *);
2798 (*mp)->m_len = sizeof(u_int);
2799 if (im6o == NULL)
2800 *loop = ip6_defmcasthlim;
2801 else
2802 *loop = im6o->im6o_multicast_loop;
2803 return (0);
2804
2805 default:
2806 return (EOPNOTSUPP);
2807 }
2808 }
2809
2810 /*
2811 * Discard the IP6 multicast options.
2812 */
2813 void
2814 ip6_freemoptions(struct ip6_moptions *im6o)
2815 {
2816 struct in6_multi_mship *imm;
2817
2818 if (im6o == NULL)
2819 return;
2820
2821 while ((imm = im6o->im6o_memberships.lh_first) != NULL) {
2822 LIST_REMOVE(imm, i6mm_chain);
2823 if (imm->i6mm_maddr)
2824 in6_delmulti(imm->i6mm_maddr);
2825 kfree(imm, M_IPMADDR);
2826 }
2827 kfree(im6o, M_IPMOPTS);
2828 }
2829
2830 /*
2831 * Set a particular packet option, as a sticky option or an ancillary data
2832 * item. "len" can be 0 only when it's a sticky option.
2833 * We have 4 cases of combination of "sticky" and "cmsg":
2834 * "sticky=0, cmsg=0": impossible
2835 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2836 * "sticky=1, cmsg=0": RFC3542 socket option
2837 * "sticky=1, cmsg=1": RFC2292 socket option
2838 */
2839 static int
2840 ip6_setpktoption(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2841 int sticky, int cmsg, int uproto, int priv)
2842 {
2843 int minmtupolicy, preftemp;
2844 //int error;
2845
2846 if (!sticky && !cmsg) {
2847 kprintf("ip6_setpktoption: impossible case\n");
2848 return (EINVAL);
2849 }
2850
2851 /*
2852 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2853 * not be specified in the context of RFC3542. Conversely,
2854 * RFC3542 types should not be specified in the context of RFC2292.
2855 */
2856 if (!cmsg) {
2857 switch (optname) {
2858 case IPV6_2292PKTINFO:
2859 case IPV6_2292HOPLIMIT:
2860 case IPV6_2292NEXTHOP:
2861 case IPV6_2292HOPOPTS:
2862 case IPV6_2292DSTOPTS:
2863 case IPV6_2292RTHDR:
2864 case IPV6_2292PKTOPTIONS:
2865 return (ENOPROTOOPT);
2866 }
2867 }
2868 if (sticky && cmsg) {
2869 switch (optname) {
2870 case IPV6_PKTINFO:
2871 case IPV6_HOPLIMIT:
2872 case IPV6_NEXTHOP:
2873 case IPV6_HOPOPTS:
2874 case IPV6_DSTOPTS:
2875 case IPV6_RTHDRDSTOPTS:
2876 case IPV6_RTHDR:
2877 case IPV6_USE_MIN_MTU:
2878 case IPV6_DONTFRAG:
2879 case IPV6_TCLASS:
2880 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2881 return (ENOPROTOOPT);
2882 }
2883 }
2884
2885 switch (optname) {
2886 case IPV6_2292PKTINFO:
2887 case IPV6_PKTINFO:
2888 {
2889 struct in6_pktinfo *pktinfo;
2890 if (len != sizeof(struct in6_pktinfo))
2891 return (EINVAL);
2892 pktinfo = (struct in6_pktinfo *)buf;
2893
2894 /*
2895 * An application can clear any sticky IPV6_PKTINFO option by
2896 * doing a "regular" setsockopt with ipi6_addr being
2897 * in6addr_any and ipi6_ifindex being zero.
2898 * [RFC 3542, Section 6]
2899 */
2900 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2901 pktinfo->ipi6_ifindex == 0 &&
2902 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2903 ip6_clearpktopts(opt, optname);
2904 break;
2905 }
2906
2907 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2908 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2909 return (EINVAL);
2910 }
2911
2912 /* validate the interface index if specified. */
2913 if (pktinfo->ipi6_ifindex > if_index ||
2914 pktinfo->ipi6_ifindex < 0) {
2915 return (ENXIO);
2916 }
2917 /*
2918 * Check if the requested source address is indeed a
2919 * unicast address assigned to the node, and can be
2920 * used as the packet's source address.
2921 */
2922 if (opt->ip6po_pktinfo != NULL &&
2923 !IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) {
2924 struct in6_ifaddr *ia6;
2925 struct sockaddr_in6 sin6;
2926
2927 bzero(&sin6, sizeof(sin6));
2928 sin6.sin6_len = sizeof(sin6);
2929 sin6.sin6_family = AF_INET6;
2930 sin6.sin6_addr =
2931 opt->ip6po_pktinfo->ipi6_addr;
2932 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6));
2933 if (ia6 == NULL ||
2934 (ia6->ia6_flags & (IN6_IFF_ANYCAST |
2935 IN6_IFF_NOTREADY)) != 0)
2936 return (EADDRNOTAVAIL);
2937 }
2938
2939 /*
2940 * We store the address anyway, and let in6_selectsrc()
2941 * validate the specified address. This is because ipi6_addr
2942 * may not have enough information about its scope zone, and
2943 * we may need additional information (such as outgoing
2944 * interface or the scope zone of a destination address) to
2945 * disambiguate the scope.
2946 * XXX: the delay of the validation may confuse the
2947 * application when it is used as a sticky option.
2948 */
2949 if (opt->ip6po_pktinfo == NULL) {
2950 opt->ip6po_pktinfo = kmalloc(sizeof(*pktinfo),
2951 M_IP6OPT, M_NOWAIT);
2952 if (opt->ip6po_pktinfo == NULL)
2953 return (ENOBUFS);
2954 }
2955 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2956 break;
2957 }
2958
2959 case IPV6_2292HOPLIMIT:
2960 case IPV6_HOPLIMIT:
2961 {
2962 int *hlimp;
2963
2964 /*
2965 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2966 * to simplify the ordering among hoplimit options.
2967 */
2968 if (optname == IPV6_HOPLIMIT && sticky)
2969 return (ENOPROTOOPT);
2970
2971 if (len != sizeof(int))
2972 return (EINVAL);
2973 hlimp = (int *)buf;
2974 if (*hlimp < -1 || *hlimp > 255)
2975 return (EINVAL);
2976
2977 opt->ip6po_hlim = *hlimp;
2978 break;
2979 }
2980
2981 case IPV6_TCLASS:
2982 {
2983 int tclass;
2984
2985 if (len != sizeof(int))
2986 return (EINVAL);
2987 tclass = *(int *)buf;
2988 if (tclass < -1 || tclass > 255)
2989 return (EINVAL);
2990
2991 opt->ip6po_tclass = tclass;
2992 break;
2993 }
2994
2995 case IPV6_2292NEXTHOP:
2996 case IPV6_NEXTHOP:
2997 if (!priv)
2998 return (EPERM);
2999
3000 if (len == 0) { /* just remove the option */
3001 ip6_clearpktopts(opt, IPV6_NEXTHOP);
3002 break;
3003 }
3004
3005 /* check if cmsg_len is large enough for sa_len */
3006 if (len < sizeof(struct sockaddr) || len < *buf)
3007 return (EINVAL);
3008
3009 switch (((struct sockaddr *)buf)->sa_family) {
3010 case AF_INET6:
3011 {
3012 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
3013 //int error;
3014
3015 if (sa6->sin6_len != sizeof(struct sockaddr_in6))
3016 return (EINVAL);
3017
3018 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
3019 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
3020 return (EINVAL);
3021 }
3022 break;
3023 }
3024 case AF_LINK: /* should eventually be supported */
3025 default:
3026 return (EAFNOSUPPORT);
3027 }
3028
3029 /* turn off the previous option, then set the new option. */
3030 ip6_clearpktopts(opt, IPV6_NEXTHOP);
3031 opt->ip6po_nexthop = kmalloc(*buf, M_IP6OPT, M_NOWAIT);
3032 if (opt->ip6po_nexthop == NULL)
3033 return (ENOBUFS);
3034 bcopy(buf, opt->ip6po_nexthop, *buf);
3035 break;
3036
3037 case IPV6_2292HOPOPTS:
3038 case IPV6_HOPOPTS:
3039 {
3040 struct ip6_hbh *hbh;
3041 int hbhlen;
3042
3043 /*
3044 * XXX: We don't allow a non-privileged user to set ANY HbH
3045 * options, since per-option restriction has too much
3046 * overhead.
3047 */
3048 if (!priv)
3049 return (EPERM);
3050 if (len == 0) {
3051 ip6_clearpktopts(opt, IPV6_HOPOPTS);
3052 break; /* just remove the option */
3053 }
3054
3055 /* message length validation */
3056 if (len < sizeof(struct ip6_hbh))
3057 return (EINVAL);
3058 hbh = (struct ip6_hbh *)buf;
3059 hbhlen = (hbh->ip6h_len + 1) << 3;
3060 if (len != hbhlen)
3061 return (EINVAL);
3062
3063 /* turn off the previous option, then set the new option. */
3064 ip6_clearpktopts(opt, IPV6_HOPOPTS);
3065 opt->ip6po_hbh = kmalloc(hbhlen, M_IP6OPT, M_NOWAIT);
3066 if (opt->ip6po_hbh == NULL)
3067 return (ENOBUFS);
3068 bcopy(hbh, opt->ip6po_hbh, hbhlen);
3069
3070 break;
3071 }
3072
3073 case IPV6_2292DSTOPTS:
3074 case IPV6_DSTOPTS:
3075 case IPV6_RTHDRDSTOPTS:
3076 {
3077 struct ip6_dest *dest, **newdest = NULL;
3078 int destlen;
3079 if (!priv)
3080 return (EPERM);
3081
3082 if (len == 0) {
3083 ip6_clearpktopts(opt, optname);
3084 break; /* just remove the option */
3085 }
3086
3087 /* message length validation */
3088 if (len < sizeof(struct ip6_dest))
3089 return (EINVAL);
3090 dest = (struct ip6_dest *)buf;
3091 destlen = (dest->ip6d_len + 1) << 3;
3092 if (len != destlen)
3093 return (EINVAL);
3094
3095 /*
3096 * Determine the position that the destination options header
3097 * should be inserted; before or after the routing header.
3098 */
3099 switch (optname) {
3100 case IPV6_2292DSTOPTS:
3101 /*
3102 * The old advacned API is ambiguous on this point.
3103 * Our approach is to determine the position based
3104 * according to the existence of a routing header.
3105 * Note, however, that this depends on the order of the
3106 * extension headers in the ancillary data; the 1st
3107 * part of the destination options header must appear
3108 * before the routing header in the ancillary data,
3109 * too.
3110 * RFC3542 solved the ambiguity by introducing
3111 * separate ancillary data or option types.
3112 */
3113 if (opt->ip6po_rthdr == NULL)
3114 newdest = &opt->ip6po_dest1;
3115 else
3116 newdest = &opt->ip6po_dest2;
3117 break;
3118 case IPV6_RTHDRDSTOPTS:
3119 newdest = &opt->ip6po_dest1;
3120 break;
3121 case IPV6_DSTOPTS:
3122 newdest = &opt->ip6po_dest2;
3123 break;
3124 }
3125
3126 /* turn off the previous option, then set the new option. */
3127 ip6_clearpktopts(opt, optname);
3128 *newdest = kmalloc(destlen, M_IP6OPT, M_NOWAIT);
3129 if (*newdest == NULL)
3130 return (ENOBUFS);
3131 bcopy(dest, *newdest, destlen);
3132
3133 break;
3134 }
3135
3136 case IPV6_2292RTHDR:
3137 case IPV6_RTHDR:
3138 {
3139 struct ip6_rthdr *rth;
3140 int rthlen;
3141
3142 if (len == 0) {
3143 ip6_clearpktopts(opt, IPV6_RTHDR);
3144 break; /* just remove the option */
3145 }
3146
3147 /* message length validation */
3148 if (len < sizeof(struct ip6_rthdr))
3149 return (EINVAL);
3150 rth = (struct ip6_rthdr *)buf;
3151 rthlen = (rth->ip6r_len + 1) << 3;
3152 if (len != rthlen)
3153 return (EINVAL);
3154
3155 switch (rth->ip6r_type) {
3156 default:
3157 return (EINVAL); /* not supported */
3158 }
3159
3160 /* turn off the previous option */
3161 ip6_clearpktopts(opt, IPV6_RTHDR);
3162 opt->ip6po_rthdr = kmalloc(rthlen, M_IP6OPT, M_NOWAIT);
3163 if (opt->ip6po_rthdr == NULL)
3164 return (ENOBUFS);
3165 bcopy(rth, opt->ip6po_rthdr, rthlen);
3166
3167 break;
3168 }
3169
3170 case IPV6_USE_MIN_MTU:
3171 if (len != sizeof(int))
3172 return (EINVAL);
3173 minmtupolicy = *(int *)buf;
3174 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
3175 minmtupolicy != IP6PO_MINMTU_DISABLE &&
3176 minmtupolicy != IP6PO_MINMTU_ALL) {
3177 return (EINVAL);
3178 }
3179 opt->ip6po_minmtu = minmtupolicy;
3180 break;
3181
3182 case IPV6_DONTFRAG:
3183 if (len != sizeof(int))
3184 return (EINVAL);
3185
3186 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
3187 /*
3188 * we ignore this option for TCP sockets.
3189 * (RFC3542 leaves this case unspecified.)
3190 */
3191 opt->ip6po_flags &= ~IP6PO_DONTFRAG;
3192 } else
3193 opt->ip6po_flags |= IP6PO_DONTFRAG;
3194 break;
3195
3196 case IPV6_PREFER_TEMPADDR:
3197 if (len != sizeof(int))
3198 return (EINVAL);
3199 preftemp = *(int *)buf;
3200 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
3201 preftemp != IP6PO_TEMPADDR_NOTPREFER &&
3202 preftemp != IP6PO_TEMPADDR_PREFER) {
3203 return (EINVAL);
3204 }
3205 opt->ip6po_prefer_tempaddr = preftemp;
3206 break;
3207
3208 default:
3209 return (ENOPROTOOPT);
3210 } /* end of switch */
3211
3212 return (0);
3213 }
3214
3215
3216 /*
3217 * Set IPv6 outgoing packet options based on advanced API.
3218 */
3219 int
3220 ip6_setpktoptions(struct mbuf *control, struct ip6_pktopts *opt,
3221 struct ip6_pktopts *stickyopt, int uproto, int priv)
3222 {
3223 struct cmsghdr *cm = NULL;
3224
3225 if (control == NULL || opt == NULL)
3226 return (EINVAL);
3227
3228 init_ip6pktopts(opt);
3229
3230 /*
3231 * XXX: Currently, we assume all the optional information is stored
3232 * in a single mbuf.
3233 */
3234 if (stickyopt) {
3235 int error;
3236
3237 /*
3238 * If stickyopt is provided, make a local copy of the options
3239 * for this particular packet, then override them by ancillary
3240 * objects.
3241 * XXX: copypktopts() does not copy the cached route to a next
3242 * hop (if any). This is not very good in terms of efficiency,
3243 * but we can allow this since this option should be rarely
3244 * used.
3245 */
3246 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
3247 return (error);
3248 }
3249
3250 /*
3251 * XXX: Currently, we assume all the optional information is stored
3252 * in a single mbuf.
3253 */
3254 if (control->m_next)
3255 return (EINVAL);
3256
3257 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len),
3258 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
3259 int error;
3260
3261 if (control->m_len < CMSG_LEN(0))
3262 return (EINVAL);
3263
3264 cm = mtod(control, struct cmsghdr *);
3265 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
3266 return (EINVAL);
3267 if (cm->cmsg_level != IPPROTO_IPV6)
3268 continue;
3269
3270 error = ip6_setpktoption(cm->cmsg_type, CMSG_DATA(cm),
3271 cm->cmsg_len - CMSG_LEN(0), opt, 0, 1, uproto, priv);
3272 if (error)
3273 return (error);
3274 }
3275
3276 return (0);
3277 }
3278
3279 /*
3280 * Routine called from ip6_output() to loop back a copy of an IP6 multicast
3281 * packet to the input queue of a specified interface. Note that this
3282 * calls the output routine of the loopback "driver", but with an interface
3283 * pointer that might NOT be &loif -- easier than replicating that code here.
3284 */
3285 void
3286 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst)
3287 {
3288 struct mbuf *copym;
3289 struct ip6_hdr *ip6;
3290
3291 copym = m_copy(m, 0, M_COPYALL);
3292 if (copym == NULL)
3293 return;
3294
3295 /*
3296 * Make sure to deep-copy IPv6 header portion in case the data
3297 * is in an mbuf cluster, so that we can safely override the IPv6
3298 * header portion later.
3299 */
3300 if ((copym->m_flags & M_EXT) != 0 ||
3301 copym->m_len < sizeof(struct ip6_hdr)) {
3302 copym = m_pullup(copym, sizeof(struct ip6_hdr));
3303 if (copym == NULL)
3304 return;
3305 }
3306
3307 #ifdef DIAGNOSTIC
3308 if (copym->m_len < sizeof(*ip6)) {
3309 m_freem(copym);
3310 return;
3311 }
3312 #endif
3313
3314 ip6 = mtod(copym, struct ip6_hdr *);
3315 /*
3316 * clear embedded scope identifiers if necessary.
3317 * in6_clearscope will touch the addresses only when necessary.
3318 */
3319 in6_clearscope(&ip6->ip6_src);
3320 in6_clearscope(&ip6->ip6_dst);
3321
3322 if_simloop(ifp, copym, dst->sin6_family, 0);
3323 }
3324
3325 /*
3326 * Separate the IPv6 header from the payload into its own mbuf.
3327 *
3328 * Returns the new mbuf chain or the original mbuf if no payload.
3329 * Returns NULL if can't allocate new mbuf for header.
3330 */
3331 static struct mbuf *
3332 ip6_splithdr(struct mbuf *m)
3333 {
3334 struct mbuf *mh;
3335
3336 if (m->m_len <= sizeof(struct ip6_hdr)) /* no payload */
3337 return (m);
3338
3339 MGETHDR(mh, MB_DONTWAIT, MT_HEADER);
3340 if (mh == NULL)
3341 return (NULL);
3342 mh->m_len = sizeof(struct ip6_hdr);
3343 M_MOVE_PKTHDR(mh, m);
3344 MH_ALIGN(mh, sizeof(struct ip6_hdr));
3345 bcopy(mtod(m, caddr_t), mtod(mh, caddr_t), sizeof(struct ip6_hdr));
3346 m->m_data += sizeof(struct ip6_hdr);
3347 m->m_len -= sizeof(struct ip6_hdr);
3348 mh->m_next = m;
3349 return (mh);
3350 }
3351
3352 /*
3353 * Compute IPv6 extension header length.
3354 */
3355 int
3356 ip6_optlen(struct in6pcb *in6p)
3357 {
3358 int len;
3359
3360 if (!in6p->in6p_outputopts)
3361 return 0;
3362
3363 len = 0;
3364 #define elen(x) \
3365 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
3366
3367 len += elen(in6p->in6p_outputopts->ip6po_hbh);
3368 if (in6p->in6p_outputopts->ip6po_rthdr)
3369 /* dest1 is valid with rthdr only */
3370 len += elen(in6p->in6p_outputopts->ip6po_dest1);
3371 len += elen(in6p->in6p_outputopts->ip6po_rthdr);
3372 len += elen(in6p->in6p_outputopts->ip6po_dest2);
3373 return len;
3374 #undef elen
3375 }
DragonFly BSD