1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $
30 */
31
32 /*-
33 * Copyright (c) 1982, 1986, 1988, 1990, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
61 */
62
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD: releng/8.1/sys/netinet6/ip6_output.c 206181 2010-04-05 13:48:23Z rrs $");
65
66 #include "opt_inet.h"
67 #include "opt_inet6.h"
68 #include "opt_ipsec.h"
69 #include "opt_sctp.h"
70
71 #include <sys/param.h>
72 #include <sys/kernel.h>
73 #include <sys/malloc.h>
74 #include <sys/mbuf.h>
75 #include <sys/errno.h>
76 #include <sys/priv.h>
77 #include <sys/proc.h>
78 #include <sys/protosw.h>
79 #include <sys/socket.h>
80 #include <sys/socketvar.h>
81 #include <sys/syslog.h>
82 #include <sys/ucred.h>
83
84 #include <net/if.h>
85 #include <net/netisr.h>
86 #include <net/route.h>
87 #include <net/pfil.h>
88 #include <net/vnet.h>
89
90 #include <netinet/in.h>
91 #include <netinet/in_var.h>
92 #include <netinet6/in6_var.h>
93 #include <netinet/ip6.h>
94 #include <netinet/icmp6.h>
95 #include <netinet6/ip6_var.h>
96 #include <netinet/in_pcb.h>
97 #include <netinet/tcp_var.h>
98 #include <netinet6/nd6.h>
99
100 #ifdef IPSEC
101 #include <netipsec/ipsec.h>
102 #include <netipsec/ipsec6.h>
103 #include <netipsec/key.h>
104 #include <netinet6/ip6_ipsec.h>
105 #endif /* IPSEC */
106 #ifdef SCTP
107 #include <netinet/sctp.h>
108 #include <netinet/sctp_crc32.h>
109 #endif
110
111 #include <netinet6/ip6protosw.h>
112 #include <netinet6/scope6_var.h>
113
114 extern int in6_mcast_loop;
115
116 struct ip6_exthdrs {
117 struct mbuf *ip6e_ip6;
118 struct mbuf *ip6e_hbh;
119 struct mbuf *ip6e_dest1;
120 struct mbuf *ip6e_rthdr;
121 struct mbuf *ip6e_dest2;
122 };
123
124 static int ip6_pcbopt __P((int, u_char *, int, struct ip6_pktopts **,
125 struct ucred *, int));
126 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *,
127 struct socket *, struct sockopt *));
128 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *);
129 static int ip6_setpktopt __P((int, u_char *, int, struct ip6_pktopts *,
130 struct ucred *, int, int, int));
131
132 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
133 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int,
134 struct ip6_frag **));
135 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
136 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
137 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *,
138 struct ifnet *, struct in6_addr *, u_long *, int *));
139 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
140
141
142 /*
143 * Make an extension header from option data. hp is the source, and
144 * mp is the destination.
145 */
146 #define MAKE_EXTHDR(hp, mp) \
147 do { \
148 if (hp) { \
149 struct ip6_ext *eh = (struct ip6_ext *)(hp); \
150 error = ip6_copyexthdr((mp), (caddr_t)(hp), \
151 ((eh)->ip6e_len + 1) << 3); \
152 if (error) \
153 goto freehdrs; \
154 } \
155 } while (/*CONSTCOND*/ 0)
156
157 /*
158 * Form a chain of extension headers.
159 * m is the extension header mbuf
160 * mp is the previous mbuf in the chain
161 * p is the next header
162 * i is the type of option.
163 */
164 #define MAKE_CHAIN(m, mp, p, i)\
165 do {\
166 if (m) {\
167 if (!hdrsplit) \
168 panic("assumption failed: hdr not split"); \
169 *mtod((m), u_char *) = *(p);\
170 *(p) = (i);\
171 p = mtod((m), u_char *);\
172 (m)->m_next = (mp)->m_next;\
173 (mp)->m_next = (m);\
174 (mp) = (m);\
175 }\
176 } while (/*CONSTCOND*/ 0)
177
178 /*
179 * IP6 output. The packet in mbuf chain m contains a skeletal IP6
180 * header (with pri, len, nxt, hlim, src, dst).
181 * This function may modify ver and hlim only.
182 * The mbuf chain containing the packet will be freed.
183 * The mbuf opt, if present, will not be freed.
184 *
185 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and
186 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one,
187 * which is rt_rmx.rmx_mtu.
188 *
189 * ifpp - XXX: just for statistics
190 */
191 int
192 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
193 struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
194 struct ifnet **ifpp, struct inpcb *inp)
195 {
196 struct ip6_hdr *ip6, *mhip6;
197 struct ifnet *ifp, *origifp;
198 struct mbuf *m = m0;
199 struct mbuf *mprev = NULL;
200 int hlen, tlen, len, off;
201 struct route_in6 ip6route;
202 struct rtentry *rt = NULL;
203 struct sockaddr_in6 *dst, src_sa, dst_sa;
204 struct in6_addr odst;
205 int error = 0;
206 struct in6_ifaddr *ia = NULL;
207 u_long mtu;
208 int alwaysfrag, dontfrag;
209 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
210 struct ip6_exthdrs exthdrs;
211 struct in6_addr finaldst, src0, dst0;
212 u_int32_t zone;
213 struct route_in6 *ro_pmtu = NULL;
214 int hdrsplit = 0;
215 int needipsec = 0;
216 #ifdef SCTP
217 int sw_csum;
218 #endif
219 #ifdef IPSEC
220 struct ipsec_output_state state;
221 struct ip6_rthdr *rh = NULL;
222 int needipsectun = 0;
223 int segleft_org = 0;
224 struct secpolicy *sp = NULL;
225 #endif /* IPSEC */
226
227 ip6 = mtod(m, struct ip6_hdr *);
228 if (ip6 == NULL) {
229 printf ("ip6 is NULL");
230 goto bad;
231 }
232
233 finaldst = ip6->ip6_dst;
234
235 bzero(&exthdrs, sizeof(exthdrs));
236
237 if (opt) {
238 /* Hop-by-Hop options header */
239 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
240 /* Destination options header(1st part) */
241 if (opt->ip6po_rthdr) {
242 /*
243 * Destination options header(1st part)
244 * This only makes sense with a routing header.
245 * See Section 9.2 of RFC 3542.
246 * Disabling this part just for MIP6 convenience is
247 * a bad idea. We need to think carefully about a
248 * way to make the advanced API coexist with MIP6
249 * options, which might automatically be inserted in
250 * the kernel.
251 */
252 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
253 }
254 /* Routing header */
255 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
256 /* Destination options header(2nd part) */
257 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
258 }
259
260 /*
261 * IPSec checking which handles several cases.
262 * FAST IPSEC: We re-injected the packet.
263 */
264 #ifdef IPSEC
265 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp, &sp))
266 {
267 case 1: /* Bad packet */
268 goto freehdrs;
269 case -1: /* Do IPSec */
270 needipsec = 1;
271 case 0: /* No IPSec */
272 default:
273 break;
274 }
275 #endif /* IPSEC */
276
277 /*
278 * Calculate the total length of the extension header chain.
279 * Keep the length of the unfragmentable part for fragmentation.
280 */
281 optlen = 0;
282 if (exthdrs.ip6e_hbh)
283 optlen += exthdrs.ip6e_hbh->m_len;
284 if (exthdrs.ip6e_dest1)
285 optlen += exthdrs.ip6e_dest1->m_len;
286 if (exthdrs.ip6e_rthdr)
287 optlen += exthdrs.ip6e_rthdr->m_len;
288 unfragpartlen = optlen + sizeof(struct ip6_hdr);
289
290 /* NOTE: we don't add AH/ESP length here. do that later. */
291 if (exthdrs.ip6e_dest2)
292 optlen += exthdrs.ip6e_dest2->m_len;
293
294 /*
295 * If we need IPsec, or there is at least one extension header,
296 * separate IP6 header from the payload.
297 */
298 if ((needipsec || optlen) && !hdrsplit) {
299 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
300 m = NULL;
301 goto freehdrs;
302 }
303 m = exthdrs.ip6e_ip6;
304 hdrsplit++;
305 }
306
307 /* adjust pointer */
308 ip6 = mtod(m, struct ip6_hdr *);
309
310 /* adjust mbuf packet header length */
311 m->m_pkthdr.len += optlen;
312 plen = m->m_pkthdr.len - sizeof(*ip6);
313
314 /* If this is a jumbo payload, insert a jumbo payload option. */
315 if (plen > IPV6_MAXPACKET) {
316 if (!hdrsplit) {
317 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
318 m = NULL;
319 goto freehdrs;
320 }
321 m = exthdrs.ip6e_ip6;
322 hdrsplit++;
323 }
324 /* adjust pointer */
325 ip6 = mtod(m, struct ip6_hdr *);
326 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
327 goto freehdrs;
328 ip6->ip6_plen = 0;
329 } else
330 ip6->ip6_plen = htons(plen);
331
332 /*
333 * Concatenate headers and fill in next header fields.
334 * Here we have, on "m"
335 * IPv6 payload
336 * and we insert headers accordingly. Finally, we should be getting:
337 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
338 *
339 * during the header composing process, "m" points to IPv6 header.
340 * "mprev" points to an extension header prior to esp.
341 */
342 u_char *nexthdrp = &ip6->ip6_nxt;
343 mprev = m;
344
345 /*
346 * we treat dest2 specially. this makes IPsec processing
347 * much easier. the goal here is to make mprev point the
348 * mbuf prior to dest2.
349 *
350 * result: IPv6 dest2 payload
351 * m and mprev will point to IPv6 header.
352 */
353 if (exthdrs.ip6e_dest2) {
354 if (!hdrsplit)
355 panic("assumption failed: hdr not split");
356 exthdrs.ip6e_dest2->m_next = m->m_next;
357 m->m_next = exthdrs.ip6e_dest2;
358 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
359 ip6->ip6_nxt = IPPROTO_DSTOPTS;
360 }
361
362 /*
363 * result: IPv6 hbh dest1 rthdr dest2 payload
364 * m will point to IPv6 header. mprev will point to the
365 * extension header prior to dest2 (rthdr in the above case).
366 */
367 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
368 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
369 IPPROTO_DSTOPTS);
370 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
371 IPPROTO_ROUTING);
372
373 #ifdef IPSEC
374 if (!needipsec)
375 goto skip_ipsec2;
376
377 /*
378 * pointers after IPsec headers are not valid any more.
379 * other pointers need a great care too.
380 * (IPsec routines should not mangle mbufs prior to AH/ESP)
381 */
382 exthdrs.ip6e_dest2 = NULL;
383
384 if (exthdrs.ip6e_rthdr) {
385 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *);
386 segleft_org = rh->ip6r_segleft;
387 rh->ip6r_segleft = 0;
388 }
389
390 bzero(&state, sizeof(state));
391 state.m = m;
392 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags,
393 &needipsectun);
394 m = state.m;
395 if (error == EJUSTRETURN) {
396 /*
397 * We had a SP with a level of 'use' and no SA. We
398 * will just continue to process the packet without
399 * IPsec processing.
400 */
401 ;
402 } else if (error) {
403 /* mbuf is already reclaimed in ipsec6_output_trans. */
404 m = NULL;
405 switch (error) {
406 case EHOSTUNREACH:
407 case ENETUNREACH:
408 case EMSGSIZE:
409 case ENOBUFS:
410 case ENOMEM:
411 break;
412 default:
413 printf("[%s:%d] (ipsec): error code %d\n",
414 __func__, __LINE__, error);
415 /* FALLTHROUGH */
416 case ENOENT:
417 /* don't show these error codes to the user */
418 error = 0;
419 break;
420 }
421 goto bad;
422 } else if (!needipsectun) {
423 /*
424 * In the FAST IPSec case we have already
425 * re-injected the packet and it has been freed
426 * by the ipsec_done() function. So, just clean
427 * up after ourselves.
428 */
429 m = NULL;
430 goto done;
431 }
432 if (exthdrs.ip6e_rthdr) {
433 /* ah6_output doesn't modify mbuf chain */
434 rh->ip6r_segleft = segleft_org;
435 }
436 skip_ipsec2:;
437 #endif /* IPSEC */
438
439 /*
440 * If there is a routing header, discard the packet.
441 */
442 if (exthdrs.ip6e_rthdr) {
443 error = EINVAL;
444 goto bad;
445 }
446
447 /* Source address validation */
448 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
449 (flags & IPV6_UNSPECSRC) == 0) {
450 error = EOPNOTSUPP;
451 V_ip6stat.ip6s_badscope++;
452 goto bad;
453 }
454 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
455 error = EOPNOTSUPP;
456 V_ip6stat.ip6s_badscope++;
457 goto bad;
458 }
459
460 V_ip6stat.ip6s_localout++;
461
462 /*
463 * Route packet.
464 */
465 if (ro == 0) {
466 ro = &ip6route;
467 bzero((caddr_t)ro, sizeof(*ro));
468 }
469 ro_pmtu = ro;
470 if (opt && opt->ip6po_rthdr)
471 ro = &opt->ip6po_route;
472 dst = (struct sockaddr_in6 *)&ro->ro_dst;
473
474 again:
475 /*
476 * if specified, try to fill in the traffic class field.
477 * do not override if a non-zero value is already set.
478 * we check the diffserv field and the ecn field separately.
479 */
480 if (opt && opt->ip6po_tclass >= 0) {
481 int mask = 0;
482
483 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
484 mask |= 0xfc;
485 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
486 mask |= 0x03;
487 if (mask != 0)
488 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
489 }
490
491 /* fill in or override the hop limit field, if necessary. */
492 if (opt && opt->ip6po_hlim != -1)
493 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
494 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
495 if (im6o != NULL)
496 ip6->ip6_hlim = im6o->im6o_multicast_hlim;
497 else
498 ip6->ip6_hlim = V_ip6_defmcasthlim;
499 }
500
501 #ifdef IPSEC
502 /*
503 * We may re-inject packets into the stack here.
504 */
505 if (needipsec && needipsectun) {
506 struct ipsec_output_state state;
507
508 /*
509 * All the extension headers will become inaccessible
510 * (since they can be encrypted).
511 * Don't panic, we need no more updates to extension headers
512 * on inner IPv6 packet (since they are now encapsulated).
513 *
514 * IPv6 [ESP|AH] IPv6 [extension headers] payload
515 */
516 bzero(&exthdrs, sizeof(exthdrs));
517 exthdrs.ip6e_ip6 = m;
518
519 bzero(&state, sizeof(state));
520 state.m = m;
521 state.ro = (struct route *)ro;
522 state.dst = (struct sockaddr *)dst;
523
524 error = ipsec6_output_tunnel(&state, sp, flags);
525
526 m = state.m;
527 ro = (struct route_in6 *)state.ro;
528 dst = (struct sockaddr_in6 *)state.dst;
529 if (error == EJUSTRETURN) {
530 /*
531 * We had a SP with a level of 'use' and no SA. We
532 * will just continue to process the packet without
533 * IPsec processing.
534 */
535 ;
536 } else 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 printf("[%s:%d] (ipsec): error code %d\n",
549 __func__, __LINE__, error);
550 /* FALLTHROUGH */
551 case ENOENT:
552 /* don't show these error codes to the user */
553 error = 0;
554 break;
555 }
556 goto bad;
557 } else {
558 /*
559 * In the FAST IPSec case we have already
560 * re-injected the packet and it has been freed
561 * by the ipsec_done() function. So, just clean
562 * up after ourselves.
563 */
564 m = NULL;
565 goto done;
566 }
567
568 exthdrs.ip6e_ip6 = m;
569 }
570 #endif /* IPSEC */
571
572 /* adjust pointer */
573 ip6 = mtod(m, struct ip6_hdr *);
574
575 bzero(&dst_sa, sizeof(dst_sa));
576 dst_sa.sin6_family = AF_INET6;
577 dst_sa.sin6_len = sizeof(dst_sa);
578 dst_sa.sin6_addr = ip6->ip6_dst;
579 if ((error = in6_selectroute(&dst_sa, opt, im6o, ro,
580 &ifp, &rt)) != 0) {
581 switch (error) {
582 case EHOSTUNREACH:
583 V_ip6stat.ip6s_noroute++;
584 break;
585 case EADDRNOTAVAIL:
586 default:
587 break; /* XXX statistics? */
588 }
589 if (ifp != NULL)
590 in6_ifstat_inc(ifp, ifs6_out_discard);
591 goto bad;
592 }
593 if (rt == NULL) {
594 /*
595 * If in6_selectroute() does not return a route entry,
596 * dst may not have been updated.
597 */
598 *dst = dst_sa; /* XXX */
599 }
600
601 /*
602 * then rt (for unicast) and ifp must be non-NULL valid values.
603 */
604 if ((flags & IPV6_FORWARDING) == 0) {
605 /* XXX: the FORWARDING flag can be set for mrouting. */
606 in6_ifstat_inc(ifp, ifs6_out_request);
607 }
608 if (rt != NULL) {
609 ia = (struct in6_ifaddr *)(rt->rt_ifa);
610 rt->rt_use++;
611 }
612
613
614 /*
615 * The outgoing interface must be in the zone of source and
616 * destination addresses.
617 */
618 origifp = ifp;
619
620 src0 = ip6->ip6_src;
621 if (in6_setscope(&src0, origifp, &zone))
622 goto badscope;
623 bzero(&src_sa, sizeof(src_sa));
624 src_sa.sin6_family = AF_INET6;
625 src_sa.sin6_len = sizeof(src_sa);
626 src_sa.sin6_addr = ip6->ip6_src;
627 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
628 goto badscope;
629
630 dst0 = ip6->ip6_dst;
631 if (in6_setscope(&dst0, origifp, &zone))
632 goto badscope;
633 /* re-initialize to be sure */
634 bzero(&dst_sa, sizeof(dst_sa));
635 dst_sa.sin6_family = AF_INET6;
636 dst_sa.sin6_len = sizeof(dst_sa);
637 dst_sa.sin6_addr = ip6->ip6_dst;
638 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) {
639 goto badscope;
640 }
641
642 /* We should use ia_ifp to support the case of
643 * sending packets to an address of our own.
644 */
645 if (ia != NULL && ia->ia_ifp)
646 ifp = ia->ia_ifp;
647
648 /* scope check is done. */
649 goto routefound;
650
651 badscope:
652 V_ip6stat.ip6s_badscope++;
653 in6_ifstat_inc(origifp, ifs6_out_discard);
654 if (error == 0)
655 error = EHOSTUNREACH; /* XXX */
656 goto bad;
657
658 routefound:
659 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
660 if (opt && opt->ip6po_nextroute.ro_rt) {
661 /*
662 * The nexthop is explicitly specified by the
663 * application. We assume the next hop is an IPv6
664 * address.
665 */
666 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
667 }
668 else if ((rt->rt_flags & RTF_GATEWAY))
669 dst = (struct sockaddr_in6 *)rt->rt_gateway;
670 }
671
672 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
673 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
674 } else {
675 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
676 in6_ifstat_inc(ifp, ifs6_out_mcast);
677 /*
678 * Confirm that the outgoing interface supports multicast.
679 */
680 if (!(ifp->if_flags & IFF_MULTICAST)) {
681 V_ip6stat.ip6s_noroute++;
682 in6_ifstat_inc(ifp, ifs6_out_discard);
683 error = ENETUNREACH;
684 goto bad;
685 }
686 if ((im6o == NULL && in6_mcast_loop) ||
687 (im6o && im6o->im6o_multicast_loop)) {
688 /*
689 * Loop back multicast datagram if not expressly
690 * forbidden to do so, even if we have not joined
691 * the address; protocols will filter it later,
692 * thus deferring a hash lookup and lock acquisition
693 * at the expense of an m_copym().
694 */
695 ip6_mloopback(ifp, m, dst);
696 } else {
697 /*
698 * If we are acting as a multicast router, perform
699 * multicast forwarding as if the packet had just
700 * arrived on the interface to which we are about
701 * to send. The multicast forwarding function
702 * recursively calls this function, using the
703 * IPV6_FORWARDING flag to prevent infinite recursion.
704 *
705 * Multicasts that are looped back by ip6_mloopback(),
706 * above, will be forwarded by the ip6_input() routine,
707 * if necessary.
708 */
709 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
710 /*
711 * XXX: ip6_mforward expects that rcvif is NULL
712 * when it is called from the originating path.
713 * However, it is not always the case, since
714 * some versions of MGETHDR() does not
715 * initialize the field.
716 */
717 m->m_pkthdr.rcvif = NULL;
718 if (ip6_mforward(ip6, ifp, m) != 0) {
719 m_freem(m);
720 goto done;
721 }
722 }
723 }
724 /*
725 * Multicasts with a hoplimit of zero may be looped back,
726 * above, but must not be transmitted on a network.
727 * Also, multicasts addressed to the loopback interface
728 * are not sent -- the above call to ip6_mloopback() will
729 * loop back a copy if this host actually belongs to the
730 * destination group on the loopback interface.
731 */
732 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
733 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
734 m_freem(m);
735 goto done;
736 }
737 }
738
739 /*
740 * Fill the outgoing inteface to tell the upper layer
741 * to increment per-interface statistics.
742 */
743 if (ifpp)
744 *ifpp = ifp;
745
746 /* Determine path MTU. */
747 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu,
748 &alwaysfrag)) != 0)
749 goto bad;
750
751 /*
752 * The caller of this function may specify to use the minimum MTU
753 * in some cases.
754 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
755 * setting. The logic is a bit complicated; by default, unicast
756 * packets will follow path MTU while multicast packets will be sent at
757 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
758 * including unicast ones will be sent at the minimum MTU. Multicast
759 * packets will always be sent at the minimum MTU unless
760 * IP6PO_MINMTU_DISABLE is explicitly specified.
761 * See RFC 3542 for more details.
762 */
763 if (mtu > IPV6_MMTU) {
764 if ((flags & IPV6_MINMTU))
765 mtu = IPV6_MMTU;
766 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
767 mtu = IPV6_MMTU;
768 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
769 (opt == NULL ||
770 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
771 mtu = IPV6_MMTU;
772 }
773 }
774
775 /*
776 * clear embedded scope identifiers if necessary.
777 * in6_clearscope will touch the addresses only when necessary.
778 */
779 in6_clearscope(&ip6->ip6_src);
780 in6_clearscope(&ip6->ip6_dst);
781
782 /*
783 * If the outgoing packet contains a hop-by-hop options header,
784 * it must be examined and processed even by the source node.
785 * (RFC 2460, section 4.)
786 */
787 if (exthdrs.ip6e_hbh) {
788 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
789 u_int32_t dummy; /* XXX unused */
790 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
791
792 #ifdef DIAGNOSTIC
793 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
794 panic("ip6e_hbh is not continuous");
795 #endif
796 /*
797 * XXX: if we have to send an ICMPv6 error to the sender,
798 * we need the M_LOOP flag since icmp6_error() expects
799 * the IPv6 and the hop-by-hop options header are
800 * continuous unless the flag is set.
801 */
802 m->m_flags |= M_LOOP;
803 m->m_pkthdr.rcvif = ifp;
804 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
805 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
806 &dummy, &plen) < 0) {
807 /* m was already freed at this point */
808 error = EINVAL;/* better error? */
809 goto done;
810 }
811 m->m_flags &= ~M_LOOP; /* XXX */
812 m->m_pkthdr.rcvif = NULL;
813 }
814
815 /* Jump over all PFIL processing if hooks are not active. */
816 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
817 goto passout;
818
819 odst = ip6->ip6_dst;
820 /* Run through list of hooks for output packets. */
821 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp);
822 if (error != 0 || m == NULL)
823 goto done;
824 ip6 = mtod(m, struct ip6_hdr *);
825
826 /* See if destination IP address was changed by packet filter. */
827 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
828 m->m_flags |= M_SKIP_FIREWALL;
829 /* If destination is now ourself drop to ip6_input(). */
830 if (in6_localaddr(&ip6->ip6_dst)) {
831 if (m->m_pkthdr.rcvif == NULL)
832 m->m_pkthdr.rcvif = V_loif;
833 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
834 m->m_pkthdr.csum_flags |=
835 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
836 m->m_pkthdr.csum_data = 0xffff;
837 }
838 m->m_pkthdr.csum_flags |=
839 CSUM_IP_CHECKED | CSUM_IP_VALID;
840 #ifdef SCTP
841 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
842 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
843 #endif
844 error = netisr_queue(NETISR_IPV6, m);
845 goto done;
846 } else
847 goto again; /* Redo the routing table lookup. */
848 }
849
850 /* XXX: IPFIREWALL_FORWARD */
851
852 passout:
853 /*
854 * Send the packet to the outgoing interface.
855 * If necessary, do IPv6 fragmentation before sending.
856 *
857 * the logic here is rather complex:
858 * 1: normal case (dontfrag == 0, alwaysfrag == 0)
859 * 1-a: send as is if tlen <= path mtu
860 * 1-b: fragment if tlen > path mtu
861 *
862 * 2: if user asks us not to fragment (dontfrag == 1)
863 * 2-a: send as is if tlen <= interface mtu
864 * 2-b: error if tlen > interface mtu
865 *
866 * 3: if we always need to attach fragment header (alwaysfrag == 1)
867 * always fragment
868 *
869 * 4: if dontfrag == 1 && alwaysfrag == 1
870 * error, as we cannot handle this conflicting request
871 */
872 #ifdef SCTP
873 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist;
874 if (sw_csum & CSUM_SCTP) {
875 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
876 sw_csum &= ~CSUM_SCTP;
877 }
878 #endif
879 tlen = m->m_pkthdr.len;
880
881 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG))
882 dontfrag = 1;
883 else
884 dontfrag = 0;
885 if (dontfrag && alwaysfrag) { /* case 4 */
886 /* conflicting request - can't transmit */
887 error = EMSGSIZE;
888 goto bad;
889 }
890 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */
891 /*
892 * Even if the DONTFRAG option is specified, we cannot send the
893 * packet when the data length is larger than the MTU of the
894 * outgoing interface.
895 * Notify the error by sending IPV6_PATHMTU ancillary data as
896 * well as returning an error code (the latter is not described
897 * in the API spec.)
898 */
899 u_int32_t mtu32;
900 struct ip6ctlparam ip6cp;
901
902 mtu32 = (u_int32_t)mtu;
903 bzero(&ip6cp, sizeof(ip6cp));
904 ip6cp.ip6c_cmdarg = (void *)&mtu32;
905 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
906 (void *)&ip6cp);
907
908 error = EMSGSIZE;
909 goto bad;
910 }
911
912 /*
913 * transmit packet without fragmentation
914 */
915 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
916 struct in6_ifaddr *ia6;
917
918 ip6 = mtod(m, struct ip6_hdr *);
919 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
920 if (ia6) {
921 /* Record statistics for this interface address. */
922 ia6->ia_ifa.if_opackets++;
923 ia6->ia_ifa.if_obytes += m->m_pkthdr.len;
924 ifa_free(&ia6->ia_ifa);
925 }
926 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
927 goto done;
928 }
929
930 /*
931 * try to fragment the packet. case 1-b and 3
932 */
933 if (mtu < IPV6_MMTU) {
934 /* path MTU cannot be less than IPV6_MMTU */
935 error = EMSGSIZE;
936 in6_ifstat_inc(ifp, ifs6_out_fragfail);
937 goto bad;
938 } else if (ip6->ip6_plen == 0) {
939 /* jumbo payload cannot be fragmented */
940 error = EMSGSIZE;
941 in6_ifstat_inc(ifp, ifs6_out_fragfail);
942 goto bad;
943 } else {
944 struct mbuf **mnext, *m_frgpart;
945 struct ip6_frag *ip6f;
946 u_int32_t id = htonl(ip6_randomid());
947 u_char nextproto;
948
949 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len;
950
951 /*
952 * Too large for the destination or interface;
953 * fragment if possible.
954 * Must be able to put at least 8 bytes per fragment.
955 */
956 hlen = unfragpartlen;
957 if (mtu > IPV6_MAXPACKET)
958 mtu = IPV6_MAXPACKET;
959
960 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
961 if (len < 8) {
962 error = EMSGSIZE;
963 in6_ifstat_inc(ifp, ifs6_out_fragfail);
964 goto bad;
965 }
966
967 /*
968 * Verify that we have any chance at all of being able to queue
969 * the packet or packet fragments
970 */
971 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen)
972 < tlen /* - hlen */)) {
973 error = ENOBUFS;
974 V_ip6stat.ip6s_odropped++;
975 goto bad;
976 }
977
978 mnext = &m->m_nextpkt;
979
980 /*
981 * Change the next header field of the last header in the
982 * unfragmentable part.
983 */
984 if (exthdrs.ip6e_rthdr) {
985 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
986 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
987 } else if (exthdrs.ip6e_dest1) {
988 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
989 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
990 } else if (exthdrs.ip6e_hbh) {
991 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
992 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
993 } else {
994 nextproto = ip6->ip6_nxt;
995 ip6->ip6_nxt = IPPROTO_FRAGMENT;
996 }
997
998 /*
999 * Loop through length of segment after first fragment,
1000 * make new header and copy data of each part and link onto
1001 * chain.
1002 */
1003 m0 = m;
1004 for (off = hlen; off < tlen; off += len) {
1005 MGETHDR(m, M_DONTWAIT, MT_HEADER);
1006 if (!m) {
1007 error = ENOBUFS;
1008 V_ip6stat.ip6s_odropped++;
1009 goto sendorfree;
1010 }
1011 m->m_pkthdr.rcvif = NULL;
1012 m->m_flags = m0->m_flags & M_COPYFLAGS;
1013 *mnext = m;
1014 mnext = &m->m_nextpkt;
1015 m->m_data += max_linkhdr;
1016 mhip6 = mtod(m, struct ip6_hdr *);
1017 *mhip6 = *ip6;
1018 m->m_len = sizeof(*mhip6);
1019 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
1020 if (error) {
1021 V_ip6stat.ip6s_odropped++;
1022 goto sendorfree;
1023 }
1024 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
1025 if (off + len >= tlen)
1026 len = tlen - off;
1027 else
1028 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
1029 mhip6->ip6_plen = htons((u_short)(len + hlen +
1030 sizeof(*ip6f) - sizeof(struct ip6_hdr)));
1031 if ((m_frgpart = m_copy(m0, off, len)) == 0) {
1032 error = ENOBUFS;
1033 V_ip6stat.ip6s_odropped++;
1034 goto sendorfree;
1035 }
1036 m_cat(m, m_frgpart);
1037 m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
1038 m->m_pkthdr.rcvif = NULL;
1039 ip6f->ip6f_reserved = 0;
1040 ip6f->ip6f_ident = id;
1041 ip6f->ip6f_nxt = nextproto;
1042 V_ip6stat.ip6s_ofragments++;
1043 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
1044 }
1045
1046 in6_ifstat_inc(ifp, ifs6_out_fragok);
1047 }
1048
1049 /*
1050 * Remove leading garbages.
1051 */
1052 sendorfree:
1053 m = m0->m_nextpkt;
1054 m0->m_nextpkt = 0;
1055 m_freem(m0);
1056 for (m0 = m; m; m = m0) {
1057 m0 = m->m_nextpkt;
1058 m->m_nextpkt = 0;
1059 if (error == 0) {
1060 /* Record statistics for this interface address. */
1061 if (ia) {
1062 ia->ia_ifa.if_opackets++;
1063 ia->ia_ifa.if_obytes += m->m_pkthdr.len;
1064 }
1065 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
1066 } else
1067 m_freem(m);
1068 }
1069
1070 if (error == 0)
1071 V_ip6stat.ip6s_fragmented++;
1072
1073 done:
1074 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */
1075 RTFREE(ro->ro_rt);
1076 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) {
1077 RTFREE(ro_pmtu->ro_rt);
1078 }
1079 #ifdef IPSEC
1080 if (sp != NULL)
1081 KEY_FREESP(&sp);
1082 #endif
1083
1084 return (error);
1085
1086 freehdrs:
1087 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */
1088 m_freem(exthdrs.ip6e_dest1);
1089 m_freem(exthdrs.ip6e_rthdr);
1090 m_freem(exthdrs.ip6e_dest2);
1091 /* FALLTHROUGH */
1092 bad:
1093 if (m)
1094 m_freem(m);
1095 goto done;
1096 }
1097
1098 static int
1099 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1100 {
1101 struct mbuf *m;
1102
1103 if (hlen > MCLBYTES)
1104 return (ENOBUFS); /* XXX */
1105
1106 MGET(m, M_DONTWAIT, MT_DATA);
1107 if (!m)
1108 return (ENOBUFS);
1109
1110 if (hlen > MLEN) {
1111 MCLGET(m, M_DONTWAIT);
1112 if ((m->m_flags & M_EXT) == 0) {
1113 m_free(m);
1114 return (ENOBUFS);
1115 }
1116 }
1117 m->m_len = hlen;
1118 if (hdr)
1119 bcopy(hdr, mtod(m, caddr_t), hlen);
1120
1121 *mp = m;
1122 return (0);
1123 }
1124
1125 /*
1126 * Insert jumbo payload option.
1127 */
1128 static int
1129 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1130 {
1131 struct mbuf *mopt;
1132 u_char *optbuf;
1133 u_int32_t v;
1134
1135 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */
1136
1137 /*
1138 * If there is no hop-by-hop options header, allocate new one.
1139 * If there is one but it doesn't have enough space to store the
1140 * jumbo payload option, allocate a cluster to store the whole options.
1141 * Otherwise, use it to store the options.
1142 */
1143 if (exthdrs->ip6e_hbh == 0) {
1144 MGET(mopt, M_DONTWAIT, MT_DATA);
1145 if (mopt == 0)
1146 return (ENOBUFS);
1147 mopt->m_len = JUMBOOPTLEN;
1148 optbuf = mtod(mopt, u_char *);
1149 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */
1150 exthdrs->ip6e_hbh = mopt;
1151 } else {
1152 struct ip6_hbh *hbh;
1153
1154 mopt = exthdrs->ip6e_hbh;
1155 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1156 /*
1157 * XXX assumption:
1158 * - exthdrs->ip6e_hbh is not referenced from places
1159 * other than exthdrs.
1160 * - exthdrs->ip6e_hbh is not an mbuf chain.
1161 */
1162 int oldoptlen = mopt->m_len;
1163 struct mbuf *n;
1164
1165 /*
1166 * XXX: give up if the whole (new) hbh header does
1167 * not fit even in an mbuf cluster.
1168 */
1169 if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1170 return (ENOBUFS);
1171
1172 /*
1173 * As a consequence, we must always prepare a cluster
1174 * at this point.
1175 */
1176 MGET(n, M_DONTWAIT, MT_DATA);
1177 if (n) {
1178 MCLGET(n, M_DONTWAIT);
1179 if ((n->m_flags & M_EXT) == 0) {
1180 m_freem(n);
1181 n = NULL;
1182 }
1183 }
1184 if (!n)
1185 return (ENOBUFS);
1186 n->m_len = oldoptlen + JUMBOOPTLEN;
1187 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
1188 oldoptlen);
1189 optbuf = mtod(n, caddr_t) + oldoptlen;
1190 m_freem(mopt);
1191 mopt = exthdrs->ip6e_hbh = n;
1192 } else {
1193 optbuf = mtod(mopt, u_char *) + mopt->m_len;
1194 mopt->m_len += JUMBOOPTLEN;
1195 }
1196 optbuf[0] = IP6OPT_PADN;
1197 optbuf[1] = 1;
1198
1199 /*
1200 * Adjust the header length according to the pad and
1201 * the jumbo payload option.
1202 */
1203 hbh = mtod(mopt, struct ip6_hbh *);
1204 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1205 }
1206
1207 /* fill in the option. */
1208 optbuf[2] = IP6OPT_JUMBO;
1209 optbuf[3] = 4;
1210 v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1211 bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1212
1213 /* finally, adjust the packet header length */
1214 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1215
1216 return (0);
1217 #undef JUMBOOPTLEN
1218 }
1219
1220 /*
1221 * Insert fragment header and copy unfragmentable header portions.
1222 */
1223 static int
1224 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1225 struct ip6_frag **frghdrp)
1226 {
1227 struct mbuf *n, *mlast;
1228
1229 if (hlen > sizeof(struct ip6_hdr)) {
1230 n = m_copym(m0, sizeof(struct ip6_hdr),
1231 hlen - sizeof(struct ip6_hdr), M_DONTWAIT);
1232 if (n == 0)
1233 return (ENOBUFS);
1234 m->m_next = n;
1235 } else
1236 n = m;
1237
1238 /* Search for the last mbuf of unfragmentable part. */
1239 for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1240 ;
1241
1242 if ((mlast->m_flags & M_EXT) == 0 &&
1243 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1244 /* use the trailing space of the last mbuf for the fragment hdr */
1245 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1246 mlast->m_len);
1247 mlast->m_len += sizeof(struct ip6_frag);
1248 m->m_pkthdr.len += sizeof(struct ip6_frag);
1249 } else {
1250 /* allocate a new mbuf for the fragment header */
1251 struct mbuf *mfrg;
1252
1253 MGET(mfrg, M_DONTWAIT, MT_DATA);
1254 if (mfrg == 0)
1255 return (ENOBUFS);
1256 mfrg->m_len = sizeof(struct ip6_frag);
1257 *frghdrp = mtod(mfrg, struct ip6_frag *);
1258 mlast->m_next = mfrg;
1259 }
1260
1261 return (0);
1262 }
1263
1264 static int
1265 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro,
1266 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup,
1267 int *alwaysfragp)
1268 {
1269 u_int32_t mtu = 0;
1270 int alwaysfrag = 0;
1271 int error = 0;
1272
1273 if (ro_pmtu != ro) {
1274 /* The first hop and the final destination may differ. */
1275 struct sockaddr_in6 *sa6_dst =
1276 (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1277 if (ro_pmtu->ro_rt &&
1278 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 ||
1279 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) {
1280 RTFREE(ro_pmtu->ro_rt);
1281 ro_pmtu->ro_rt = (struct rtentry *)NULL;
1282 }
1283 if (ro_pmtu->ro_rt == NULL) {
1284 bzero(sa6_dst, sizeof(*sa6_dst));
1285 sa6_dst->sin6_family = AF_INET6;
1286 sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1287 sa6_dst->sin6_addr = *dst;
1288
1289 rtalloc((struct route *)ro_pmtu);
1290 }
1291 }
1292 if (ro_pmtu->ro_rt) {
1293 u_int32_t ifmtu;
1294 struct in_conninfo inc;
1295
1296 bzero(&inc, sizeof(inc));
1297 inc.inc_flags |= INC_ISIPV6;
1298 inc.inc6_faddr = *dst;
1299
1300 if (ifp == NULL)
1301 ifp = ro_pmtu->ro_rt->rt_ifp;
1302 ifmtu = IN6_LINKMTU(ifp);
1303 mtu = tcp_hc_getmtu(&inc);
1304 if (mtu)
1305 mtu = min(mtu, ro_pmtu->ro_rt->rt_rmx.rmx_mtu);
1306 else
1307 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu;
1308 if (mtu == 0)
1309 mtu = ifmtu;
1310 else if (mtu < IPV6_MMTU) {
1311 /*
1312 * RFC2460 section 5, last paragraph:
1313 * if we record ICMPv6 too big message with
1314 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1315 * or smaller, with framgent header attached.
1316 * (fragment header is needed regardless from the
1317 * packet size, for translators to identify packets)
1318 */
1319 alwaysfrag = 1;
1320 mtu = IPV6_MMTU;
1321 } else if (mtu > ifmtu) {
1322 /*
1323 * The MTU on the route is larger than the MTU on
1324 * the interface! This shouldn't happen, unless the
1325 * MTU of the interface has been changed after the
1326 * interface was brought up. Change the MTU in the
1327 * route to match the interface MTU (as long as the
1328 * field isn't locked).
1329 */
1330 mtu = ifmtu;
1331 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu;
1332 }
1333 } else if (ifp) {
1334 mtu = IN6_LINKMTU(ifp);
1335 } else
1336 error = EHOSTUNREACH; /* XXX */
1337
1338 *mtup = mtu;
1339 if (alwaysfragp)
1340 *alwaysfragp = alwaysfrag;
1341 return (error);
1342 }
1343
1344 /*
1345 * IP6 socket option processing.
1346 */
1347 int
1348 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1349 {
1350 int optdatalen, uproto;
1351 void *optdata;
1352 struct inpcb *in6p = sotoinpcb(so);
1353 int error, optval;
1354 int level, op, optname;
1355 int optlen;
1356 struct thread *td;
1357
1358 level = sopt->sopt_level;
1359 op = sopt->sopt_dir;
1360 optname = sopt->sopt_name;
1361 optlen = sopt->sopt_valsize;
1362 td = sopt->sopt_td;
1363 error = 0;
1364 optval = 0;
1365 uproto = (int)so->so_proto->pr_protocol;
1366
1367 if (level == IPPROTO_IPV6) {
1368 switch (op) {
1369
1370 case SOPT_SET:
1371 switch (optname) {
1372 case IPV6_2292PKTOPTIONS:
1373 #ifdef IPV6_PKTOPTIONS
1374 case IPV6_PKTOPTIONS:
1375 #endif
1376 {
1377 struct mbuf *m;
1378
1379 error = soopt_getm(sopt, &m); /* XXX */
1380 if (error != 0)
1381 break;
1382 error = soopt_mcopyin(sopt, m); /* XXX */
1383 if (error != 0)
1384 break;
1385 error = ip6_pcbopts(&in6p->in6p_outputopts,
1386 m, so, sopt);
1387 m_freem(m); /* XXX */
1388 break;
1389 }
1390
1391 /*
1392 * Use of some Hop-by-Hop options or some
1393 * Destination options, might require special
1394 * privilege. That is, normal applications
1395 * (without special privilege) might be forbidden
1396 * from setting certain options in outgoing packets,
1397 * and might never see certain options in received
1398 * packets. [RFC 2292 Section 6]
1399 * KAME specific note:
1400 * KAME prevents non-privileged users from sending or
1401 * receiving ANY hbh/dst options in order to avoid
1402 * overhead of parsing options in the kernel.
1403 */
1404 case IPV6_RECVHOPOPTS:
1405 case IPV6_RECVDSTOPTS:
1406 case IPV6_RECVRTHDRDSTOPTS:
1407 if (td != NULL) {
1408 error = priv_check(td,
1409 PRIV_NETINET_SETHDROPTS);
1410 if (error)
1411 break;
1412 }
1413 /* FALLTHROUGH */
1414 case IPV6_UNICAST_HOPS:
1415 case IPV6_HOPLIMIT:
1416 case IPV6_FAITH:
1417
1418 case IPV6_RECVPKTINFO:
1419 case IPV6_RECVHOPLIMIT:
1420 case IPV6_RECVRTHDR:
1421 case IPV6_RECVPATHMTU:
1422 case IPV6_RECVTCLASS:
1423 case IPV6_V6ONLY:
1424 case IPV6_AUTOFLOWLABEL:
1425 case IPV6_BINDANY:
1426 if (optname == IPV6_BINDANY && td != NULL) {
1427 error = priv_check(td,
1428 PRIV_NETINET_BINDANY);
1429 if (error)
1430 break;
1431 }
1432
1433 if (optlen != sizeof(int)) {
1434 error = EINVAL;
1435 break;
1436 }
1437 error = sooptcopyin(sopt, &optval,
1438 sizeof optval, sizeof optval);
1439 if (error)
1440 break;
1441 switch (optname) {
1442
1443 case IPV6_UNICAST_HOPS:
1444 if (optval < -1 || optval >= 256)
1445 error = EINVAL;
1446 else {
1447 /* -1 = kernel default */
1448 in6p->in6p_hops = optval;
1449 if ((in6p->inp_vflag &
1450 INP_IPV4) != 0)
1451 in6p->inp_ip_ttl = optval;
1452 }
1453 break;
1454 #define OPTSET(bit) \
1455 do { \
1456 if (optval) \
1457 in6p->inp_flags |= (bit); \
1458 else \
1459 in6p->inp_flags &= ~(bit); \
1460 } while (/*CONSTCOND*/ 0)
1461 #define OPTSET2292(bit) \
1462 do { \
1463 in6p->inp_flags |= IN6P_RFC2292; \
1464 if (optval) \
1465 in6p->inp_flags |= (bit); \
1466 else \
1467 in6p->inp_flags &= ~(bit); \
1468 } while (/*CONSTCOND*/ 0)
1469 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0)
1470
1471 case IPV6_RECVPKTINFO:
1472 /* cannot mix with RFC2292 */
1473 if (OPTBIT(IN6P_RFC2292)) {
1474 error = EINVAL;
1475 break;
1476 }
1477 OPTSET(IN6P_PKTINFO);
1478 break;
1479
1480 case IPV6_HOPLIMIT:
1481 {
1482 struct ip6_pktopts **optp;
1483
1484 /* cannot mix with RFC2292 */
1485 if (OPTBIT(IN6P_RFC2292)) {
1486 error = EINVAL;
1487 break;
1488 }
1489 optp = &in6p->in6p_outputopts;
1490 error = ip6_pcbopt(IPV6_HOPLIMIT,
1491 (u_char *)&optval, sizeof(optval),
1492 optp, (td != NULL) ? td->td_ucred :
1493 NULL, uproto);
1494 break;
1495 }
1496
1497 case IPV6_RECVHOPLIMIT:
1498 /* cannot mix with RFC2292 */
1499 if (OPTBIT(IN6P_RFC2292)) {
1500 error = EINVAL;
1501 break;
1502 }
1503 OPTSET(IN6P_HOPLIMIT);
1504 break;
1505
1506 case IPV6_RECVHOPOPTS:
1507 /* cannot mix with RFC2292 */
1508 if (OPTBIT(IN6P_RFC2292)) {
1509 error = EINVAL;
1510 break;
1511 }
1512 OPTSET(IN6P_HOPOPTS);
1513 break;
1514
1515 case IPV6_RECVDSTOPTS:
1516 /* cannot mix with RFC2292 */
1517 if (OPTBIT(IN6P_RFC2292)) {
1518 error = EINVAL;
1519 break;
1520 }
1521 OPTSET(IN6P_DSTOPTS);
1522 break;
1523
1524 case IPV6_RECVRTHDRDSTOPTS:
1525 /* cannot mix with RFC2292 */
1526 if (OPTBIT(IN6P_RFC2292)) {
1527 error = EINVAL;
1528 break;
1529 }
1530 OPTSET(IN6P_RTHDRDSTOPTS);
1531 break;
1532
1533 case IPV6_RECVRTHDR:
1534 /* cannot mix with RFC2292 */
1535 if (OPTBIT(IN6P_RFC2292)) {
1536 error = EINVAL;
1537 break;
1538 }
1539 OPTSET(IN6P_RTHDR);
1540 break;
1541
1542 case IPV6_FAITH:
1543 OPTSET(INP_FAITH);
1544 break;
1545
1546 case IPV6_RECVPATHMTU:
1547 /*
1548 * We ignore this option for TCP
1549 * sockets.
1550 * (RFC3542 leaves this case
1551 * unspecified.)
1552 */
1553 if (uproto != IPPROTO_TCP)
1554 OPTSET(IN6P_MTU);
1555 break;
1556
1557 case IPV6_V6ONLY:
1558 /*
1559 * make setsockopt(IPV6_V6ONLY)
1560 * available only prior to bind(2).
1561 * see ipng mailing list, Jun 22 2001.
1562 */
1563 if (in6p->inp_lport ||
1564 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1565 error = EINVAL;
1566 break;
1567 }
1568 OPTSET(IN6P_IPV6_V6ONLY);
1569 if (optval)
1570 in6p->inp_vflag &= ~INP_IPV4;
1571 else
1572 in6p->inp_vflag |= INP_IPV4;
1573 break;
1574 case IPV6_RECVTCLASS:
1575 /* cannot mix with RFC2292 XXX */
1576 if (OPTBIT(IN6P_RFC2292)) {
1577 error = EINVAL;
1578 break;
1579 }
1580 OPTSET(IN6P_TCLASS);
1581 break;
1582 case IPV6_AUTOFLOWLABEL:
1583 OPTSET(IN6P_AUTOFLOWLABEL);
1584 break;
1585
1586 case IPV6_BINDANY:
1587 OPTSET(INP_BINDANY);
1588 break;
1589 }
1590 break;
1591
1592 case IPV6_TCLASS:
1593 case IPV6_DONTFRAG:
1594 case IPV6_USE_MIN_MTU:
1595 case IPV6_PREFER_TEMPADDR:
1596 if (optlen != sizeof(optval)) {
1597 error = EINVAL;
1598 break;
1599 }
1600 error = sooptcopyin(sopt, &optval,
1601 sizeof optval, sizeof optval);
1602 if (error)
1603 break;
1604 {
1605 struct ip6_pktopts **optp;
1606 optp = &in6p->in6p_outputopts;
1607 error = ip6_pcbopt(optname,
1608 (u_char *)&optval, sizeof(optval),
1609 optp, (td != NULL) ? td->td_ucred :
1610 NULL, uproto);
1611 break;
1612 }
1613
1614 case IPV6_2292PKTINFO:
1615 case IPV6_2292HOPLIMIT:
1616 case IPV6_2292HOPOPTS:
1617 case IPV6_2292DSTOPTS:
1618 case IPV6_2292RTHDR:
1619 /* RFC 2292 */
1620 if (optlen != sizeof(int)) {
1621 error = EINVAL;
1622 break;
1623 }
1624 error = sooptcopyin(sopt, &optval,
1625 sizeof optval, sizeof optval);
1626 if (error)
1627 break;
1628 switch (optname) {
1629 case IPV6_2292PKTINFO:
1630 OPTSET2292(IN6P_PKTINFO);
1631 break;
1632 case IPV6_2292HOPLIMIT:
1633 OPTSET2292(IN6P_HOPLIMIT);
1634 break;
1635 case IPV6_2292HOPOPTS:
1636 /*
1637 * Check super-user privilege.
1638 * See comments for IPV6_RECVHOPOPTS.
1639 */
1640 if (td != NULL) {
1641 error = priv_check(td,
1642 PRIV_NETINET_SETHDROPTS);
1643 if (error)
1644 return (error);
1645 }
1646 OPTSET2292(IN6P_HOPOPTS);
1647 break;
1648 case IPV6_2292DSTOPTS:
1649 if (td != NULL) {
1650 error = priv_check(td,
1651 PRIV_NETINET_SETHDROPTS);
1652 if (error)
1653 return (error);
1654 }
1655 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1656 break;
1657 case IPV6_2292RTHDR:
1658 OPTSET2292(IN6P_RTHDR);
1659 break;
1660 }
1661 break;
1662 case IPV6_PKTINFO:
1663 case IPV6_HOPOPTS:
1664 case IPV6_RTHDR:
1665 case IPV6_DSTOPTS:
1666 case IPV6_RTHDRDSTOPTS:
1667 case IPV6_NEXTHOP:
1668 {
1669 /* new advanced API (RFC3542) */
1670 u_char *optbuf;
1671 u_char optbuf_storage[MCLBYTES];
1672 int optlen;
1673 struct ip6_pktopts **optp;
1674
1675 /* cannot mix with RFC2292 */
1676 if (OPTBIT(IN6P_RFC2292)) {
1677 error = EINVAL;
1678 break;
1679 }
1680
1681 /*
1682 * We only ensure valsize is not too large
1683 * here. Further validation will be done
1684 * later.
1685 */
1686 error = sooptcopyin(sopt, optbuf_storage,
1687 sizeof(optbuf_storage), 0);
1688 if (error)
1689 break;
1690 optlen = sopt->sopt_valsize;
1691 optbuf = optbuf_storage;
1692 optp = &in6p->in6p_outputopts;
1693 error = ip6_pcbopt(optname, optbuf, optlen,
1694 optp, (td != NULL) ? td->td_ucred : NULL,
1695 uproto);
1696 break;
1697 }
1698 #undef OPTSET
1699
1700 case IPV6_MULTICAST_IF:
1701 case IPV6_MULTICAST_HOPS:
1702 case IPV6_MULTICAST_LOOP:
1703 case IPV6_JOIN_GROUP:
1704 case IPV6_LEAVE_GROUP:
1705 case IPV6_MSFILTER:
1706 case MCAST_BLOCK_SOURCE:
1707 case MCAST_UNBLOCK_SOURCE:
1708 case MCAST_JOIN_GROUP:
1709 case MCAST_LEAVE_GROUP:
1710 case MCAST_JOIN_SOURCE_GROUP:
1711 case MCAST_LEAVE_SOURCE_GROUP:
1712 error = ip6_setmoptions(in6p, sopt);
1713 break;
1714
1715 case IPV6_PORTRANGE:
1716 error = sooptcopyin(sopt, &optval,
1717 sizeof optval, sizeof optval);
1718 if (error)
1719 break;
1720
1721 switch (optval) {
1722 case IPV6_PORTRANGE_DEFAULT:
1723 in6p->inp_flags &= ~(INP_LOWPORT);
1724 in6p->inp_flags &= ~(INP_HIGHPORT);
1725 break;
1726
1727 case IPV6_PORTRANGE_HIGH:
1728 in6p->inp_flags &= ~(INP_LOWPORT);
1729 in6p->inp_flags |= INP_HIGHPORT;
1730 break;
1731
1732 case IPV6_PORTRANGE_LOW:
1733 in6p->inp_flags &= ~(INP_HIGHPORT);
1734 in6p->inp_flags |= INP_LOWPORT;
1735 break;
1736
1737 default:
1738 error = EINVAL;
1739 break;
1740 }
1741 break;
1742
1743 #ifdef IPSEC
1744 case IPV6_IPSEC_POLICY:
1745 {
1746 caddr_t req;
1747 struct mbuf *m;
1748
1749 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1750 break;
1751 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
1752 break;
1753 req = mtod(m, caddr_t);
1754 error = ipsec_set_policy(in6p, optname, req,
1755 m->m_len, (sopt->sopt_td != NULL) ?
1756 sopt->sopt_td->td_ucred : NULL);
1757 m_freem(m);
1758 break;
1759 }
1760 #endif /* IPSEC */
1761
1762 default:
1763 error = ENOPROTOOPT;
1764 break;
1765 }
1766 break;
1767
1768 case SOPT_GET:
1769 switch (optname) {
1770
1771 case IPV6_2292PKTOPTIONS:
1772 #ifdef IPV6_PKTOPTIONS
1773 case IPV6_PKTOPTIONS:
1774 #endif
1775 /*
1776 * RFC3542 (effectively) deprecated the
1777 * semantics of the 2292-style pktoptions.
1778 * Since it was not reliable in nature (i.e.,
1779 * applications had to expect the lack of some
1780 * information after all), it would make sense
1781 * to simplify this part by always returning
1782 * empty data.
1783 */
1784 sopt->sopt_valsize = 0;
1785 break;
1786
1787 case IPV6_RECVHOPOPTS:
1788 case IPV6_RECVDSTOPTS:
1789 case IPV6_RECVRTHDRDSTOPTS:
1790 case IPV6_UNICAST_HOPS:
1791 case IPV6_RECVPKTINFO:
1792 case IPV6_RECVHOPLIMIT:
1793 case IPV6_RECVRTHDR:
1794 case IPV6_RECVPATHMTU:
1795
1796 case IPV6_FAITH:
1797 case IPV6_V6ONLY:
1798 case IPV6_PORTRANGE:
1799 case IPV6_RECVTCLASS:
1800 case IPV6_AUTOFLOWLABEL:
1801 switch (optname) {
1802
1803 case IPV6_RECVHOPOPTS:
1804 optval = OPTBIT(IN6P_HOPOPTS);
1805 break;
1806
1807 case IPV6_RECVDSTOPTS:
1808 optval = OPTBIT(IN6P_DSTOPTS);
1809 break;
1810
1811 case IPV6_RECVRTHDRDSTOPTS:
1812 optval = OPTBIT(IN6P_RTHDRDSTOPTS);
1813 break;
1814
1815 case IPV6_UNICAST_HOPS:
1816 optval = in6p->in6p_hops;
1817 break;
1818
1819 case IPV6_RECVPKTINFO:
1820 optval = OPTBIT(IN6P_PKTINFO);
1821 break;
1822
1823 case IPV6_RECVHOPLIMIT:
1824 optval = OPTBIT(IN6P_HOPLIMIT);
1825 break;
1826
1827 case IPV6_RECVRTHDR:
1828 optval = OPTBIT(IN6P_RTHDR);
1829 break;
1830
1831 case IPV6_RECVPATHMTU:
1832 optval = OPTBIT(IN6P_MTU);
1833 break;
1834
1835 case IPV6_FAITH:
1836 optval = OPTBIT(INP_FAITH);
1837 break;
1838
1839 case IPV6_V6ONLY:
1840 optval = OPTBIT(IN6P_IPV6_V6ONLY);
1841 break;
1842
1843 case IPV6_PORTRANGE:
1844 {
1845 int flags;
1846 flags = in6p->inp_flags;
1847 if (flags & INP_HIGHPORT)
1848 optval = IPV6_PORTRANGE_HIGH;
1849 else if (flags & INP_LOWPORT)
1850 optval = IPV6_PORTRANGE_LOW;
1851 else
1852 optval = 0;
1853 break;
1854 }
1855 case IPV6_RECVTCLASS:
1856 optval = OPTBIT(IN6P_TCLASS);
1857 break;
1858
1859 case IPV6_AUTOFLOWLABEL:
1860 optval = OPTBIT(IN6P_AUTOFLOWLABEL);
1861 break;
1862
1863 case IPV6_BINDANY:
1864 optval = OPTBIT(INP_BINDANY);
1865 break;
1866 }
1867 if (error)
1868 break;
1869 error = sooptcopyout(sopt, &optval,
1870 sizeof optval);
1871 break;
1872
1873 case IPV6_PATHMTU:
1874 {
1875 u_long pmtu = 0;
1876 struct ip6_mtuinfo mtuinfo;
1877 struct route_in6 sro;
1878
1879 bzero(&sro, sizeof(sro));
1880
1881 if (!(so->so_state & SS_ISCONNECTED))
1882 return (ENOTCONN);
1883 /*
1884 * XXX: we dot not consider the case of source
1885 * routing, or optional information to specify
1886 * the outgoing interface.
1887 */
1888 error = ip6_getpmtu(&sro, NULL, NULL,
1889 &in6p->in6p_faddr, &pmtu, NULL);
1890 if (sro.ro_rt)
1891 RTFREE(sro.ro_rt);
1892 if (error)
1893 break;
1894 if (pmtu > IPV6_MAXPACKET)
1895 pmtu = IPV6_MAXPACKET;
1896
1897 bzero(&mtuinfo, sizeof(mtuinfo));
1898 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
1899 optdata = (void *)&mtuinfo;
1900 optdatalen = sizeof(mtuinfo);
1901 error = sooptcopyout(sopt, optdata,
1902 optdatalen);
1903 break;
1904 }
1905
1906 case IPV6_2292PKTINFO:
1907 case IPV6_2292HOPLIMIT:
1908 case IPV6_2292HOPOPTS:
1909 case IPV6_2292RTHDR:
1910 case IPV6_2292DSTOPTS:
1911 switch (optname) {
1912 case IPV6_2292PKTINFO:
1913 optval = OPTBIT(IN6P_PKTINFO);
1914 break;
1915 case IPV6_2292HOPLIMIT:
1916 optval = OPTBIT(IN6P_HOPLIMIT);
1917 break;
1918 case IPV6_2292HOPOPTS:
1919 optval = OPTBIT(IN6P_HOPOPTS);
1920 break;
1921 case IPV6_2292RTHDR:
1922 optval = OPTBIT(IN6P_RTHDR);
1923 break;
1924 case IPV6_2292DSTOPTS:
1925 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
1926 break;
1927 }
1928 error = sooptcopyout(sopt, &optval,
1929 sizeof optval);
1930 break;
1931 case IPV6_PKTINFO:
1932 case IPV6_HOPOPTS:
1933 case IPV6_RTHDR:
1934 case IPV6_DSTOPTS:
1935 case IPV6_RTHDRDSTOPTS:
1936 case IPV6_NEXTHOP:
1937 case IPV6_TCLASS:
1938 case IPV6_DONTFRAG:
1939 case IPV6_USE_MIN_MTU:
1940 case IPV6_PREFER_TEMPADDR:
1941 error = ip6_getpcbopt(in6p->in6p_outputopts,
1942 optname, sopt);
1943 break;
1944
1945 case IPV6_MULTICAST_IF:
1946 case IPV6_MULTICAST_HOPS:
1947 case IPV6_MULTICAST_LOOP:
1948 case IPV6_MSFILTER:
1949 error = ip6_getmoptions(in6p, sopt);
1950 break;
1951
1952 #ifdef IPSEC
1953 case IPV6_IPSEC_POLICY:
1954 {
1955 caddr_t req = NULL;
1956 size_t len = 0;
1957 struct mbuf *m = NULL;
1958 struct mbuf **mp = &m;
1959 size_t ovalsize = sopt->sopt_valsize;
1960 caddr_t oval = (caddr_t)sopt->sopt_val;
1961
1962 error = soopt_getm(sopt, &m); /* XXX */
1963 if (error != 0)
1964 break;
1965 error = soopt_mcopyin(sopt, m); /* XXX */
1966 if (error != 0)
1967 break;
1968 sopt->sopt_valsize = ovalsize;
1969 sopt->sopt_val = oval;
1970 if (m) {
1971 req = mtod(m, caddr_t);
1972 len = m->m_len;
1973 }
1974 error = ipsec_get_policy(in6p, req, len, mp);
1975 if (error == 0)
1976 error = soopt_mcopyout(sopt, m); /* XXX */
1977 if (error == 0 && m)
1978 m_freem(m);
1979 break;
1980 }
1981 #endif /* IPSEC */
1982
1983 default:
1984 error = ENOPROTOOPT;
1985 break;
1986 }
1987 break;
1988 }
1989 } else { /* level != IPPROTO_IPV6 */
1990 error = EINVAL;
1991 }
1992 return (error);
1993 }
1994
1995 int
1996 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
1997 {
1998 int error = 0, optval, optlen;
1999 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2000 struct inpcb *in6p = sotoinpcb(so);
2001 int level, op, optname;
2002
2003 level = sopt->sopt_level;
2004 op = sopt->sopt_dir;
2005 optname = sopt->sopt_name;
2006 optlen = sopt->sopt_valsize;
2007
2008 if (level != IPPROTO_IPV6) {
2009 return (EINVAL);
2010 }
2011
2012 switch (optname) {
2013 case IPV6_CHECKSUM:
2014 /*
2015 * For ICMPv6 sockets, no modification allowed for checksum
2016 * offset, permit "no change" values to help existing apps.
2017 *
2018 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2019 * for an ICMPv6 socket will fail."
2020 * The current behavior does not meet RFC3542.
2021 */
2022 switch (op) {
2023 case SOPT_SET:
2024 if (optlen != sizeof(int)) {
2025 error = EINVAL;
2026 break;
2027 }
2028 error = sooptcopyin(sopt, &optval, sizeof(optval),
2029 sizeof(optval));
2030 if (error)
2031 break;
2032 if ((optval % 2) != 0) {
2033 /* the API assumes even offset values */
2034 error = EINVAL;
2035 } else if (so->so_proto->pr_protocol ==
2036 IPPROTO_ICMPV6) {
2037 if (optval != icmp6off)
2038 error = EINVAL;
2039 } else
2040 in6p->in6p_cksum = optval;
2041 break;
2042
2043 case SOPT_GET:
2044 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
2045 optval = icmp6off;
2046 else
2047 optval = in6p->in6p_cksum;
2048
2049 error = sooptcopyout(sopt, &optval, sizeof(optval));
2050 break;
2051
2052 default:
2053 error = EINVAL;
2054 break;
2055 }
2056 break;
2057
2058 default:
2059 error = ENOPROTOOPT;
2060 break;
2061 }
2062
2063 return (error);
2064 }
2065
2066 /*
2067 * Set up IP6 options in pcb for insertion in output packets or
2068 * specifying behavior of outgoing packets.
2069 */
2070 static int
2071 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2072 struct socket *so, struct sockopt *sopt)
2073 {
2074 struct ip6_pktopts *opt = *pktopt;
2075 int error = 0;
2076 struct thread *td = sopt->sopt_td;
2077
2078 /* turn off any old options. */
2079 if (opt) {
2080 #ifdef DIAGNOSTIC
2081 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2082 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2083 opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2084 printf("ip6_pcbopts: all specified options are cleared.\n");
2085 #endif
2086 ip6_clearpktopts(opt, -1);
2087 } else
2088 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2089 *pktopt = NULL;
2090
2091 if (!m || m->m_len == 0) {
2092 /*
2093 * Only turning off any previous options, regardless of
2094 * whether the opt is just created or given.
2095 */
2096 free(opt, M_IP6OPT);
2097 return (0);
2098 }
2099
2100 /* set options specified by user. */
2101 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2102 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2103 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2104 free(opt, M_IP6OPT);
2105 return (error);
2106 }
2107 *pktopt = opt;
2108 return (0);
2109 }
2110
2111 /*
2112 * initialize ip6_pktopts. beware that there are non-zero default values in
2113 * the struct.
2114 */
2115 void
2116 ip6_initpktopts(struct ip6_pktopts *opt)
2117 {
2118
2119 bzero(opt, sizeof(*opt));
2120 opt->ip6po_hlim = -1; /* -1 means default hop limit */
2121 opt->ip6po_tclass = -1; /* -1 means default traffic class */
2122 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2123 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2124 }
2125
2126 static int
2127 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2128 struct ucred *cred, int uproto)
2129 {
2130 struct ip6_pktopts *opt;
2131
2132 if (*pktopt == NULL) {
2133 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2134 M_WAITOK);
2135 ip6_initpktopts(*pktopt);
2136 }
2137 opt = *pktopt;
2138
2139 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
2140 }
2141
2142 static int
2143 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt)
2144 {
2145 void *optdata = NULL;
2146 int optdatalen = 0;
2147 struct ip6_ext *ip6e;
2148 int error = 0;
2149 struct in6_pktinfo null_pktinfo;
2150 int deftclass = 0, on;
2151 int defminmtu = IP6PO_MINMTU_MCASTONLY;
2152 int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2153
2154 switch (optname) {
2155 case IPV6_PKTINFO:
2156 if (pktopt && pktopt->ip6po_pktinfo)
2157 optdata = (void *)pktopt->ip6po_pktinfo;
2158 else {
2159 /* XXX: we don't have to do this every time... */
2160 bzero(&null_pktinfo, sizeof(null_pktinfo));
2161 optdata = (void *)&null_pktinfo;
2162 }
2163 optdatalen = sizeof(struct in6_pktinfo);
2164 break;
2165 case IPV6_TCLASS:
2166 if (pktopt && pktopt->ip6po_tclass >= 0)
2167 optdata = (void *)&pktopt->ip6po_tclass;
2168 else
2169 optdata = (void *)&deftclass;
2170 optdatalen = sizeof(int);
2171 break;
2172 case IPV6_HOPOPTS:
2173 if (pktopt && pktopt->ip6po_hbh) {
2174 optdata = (void *)pktopt->ip6po_hbh;
2175 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
2176 optdatalen = (ip6e->ip6e_len + 1) << 3;
2177 }
2178 break;
2179 case IPV6_RTHDR:
2180 if (pktopt && pktopt->ip6po_rthdr) {
2181 optdata = (void *)pktopt->ip6po_rthdr;
2182 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
2183 optdatalen = (ip6e->ip6e_len + 1) << 3;
2184 }
2185 break;
2186 case IPV6_RTHDRDSTOPTS:
2187 if (pktopt && pktopt->ip6po_dest1) {
2188 optdata = (void *)pktopt->ip6po_dest1;
2189 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
2190 optdatalen = (ip6e->ip6e_len + 1) << 3;
2191 }
2192 break;
2193 case IPV6_DSTOPTS:
2194 if (pktopt && pktopt->ip6po_dest2) {
2195 optdata = (void *)pktopt->ip6po_dest2;
2196 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
2197 optdatalen = (ip6e->ip6e_len + 1) << 3;
2198 }
2199 break;
2200 case IPV6_NEXTHOP:
2201 if (pktopt && pktopt->ip6po_nexthop) {
2202 optdata = (void *)pktopt->ip6po_nexthop;
2203 optdatalen = pktopt->ip6po_nexthop->sa_len;
2204 }
2205 break;
2206 case IPV6_USE_MIN_MTU:
2207 if (pktopt)
2208 optdata = (void *)&pktopt->ip6po_minmtu;
2209 else
2210 optdata = (void *)&defminmtu;
2211 optdatalen = sizeof(int);
2212 break;
2213 case IPV6_DONTFRAG:
2214 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2215 on = 1;
2216 else
2217 on = 0;
2218 optdata = (void *)&on;
2219 optdatalen = sizeof(on);
2220 break;
2221 case IPV6_PREFER_TEMPADDR:
2222 if (pktopt)
2223 optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
2224 else
2225 optdata = (void *)&defpreftemp;
2226 optdatalen = sizeof(int);
2227 break;
2228 default: /* should not happen */
2229 #ifdef DIAGNOSTIC
2230 panic("ip6_getpcbopt: unexpected option\n");
2231 #endif
2232 return (ENOPROTOOPT);
2233 }
2234
2235 error = sooptcopyout(sopt, optdata, optdatalen);
2236
2237 return (error);
2238 }
2239
2240 void
2241 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2242 {
2243 if (pktopt == NULL)
2244 return;
2245
2246 if (optname == -1 || optname == IPV6_PKTINFO) {
2247 if (pktopt->ip6po_pktinfo)
2248 free(pktopt->ip6po_pktinfo, M_IP6OPT);
2249 pktopt->ip6po_pktinfo = NULL;
2250 }
2251 if (optname == -1 || optname == IPV6_HOPLIMIT)
2252 pktopt->ip6po_hlim = -1;
2253 if (optname == -1 || optname == IPV6_TCLASS)
2254 pktopt->ip6po_tclass = -1;
2255 if (optname == -1 || optname == IPV6_NEXTHOP) {
2256 if (pktopt->ip6po_nextroute.ro_rt) {
2257 RTFREE(pktopt->ip6po_nextroute.ro_rt);
2258 pktopt->ip6po_nextroute.ro_rt = NULL;
2259 }
2260 if (pktopt->ip6po_nexthop)
2261 free(pktopt->ip6po_nexthop, M_IP6OPT);
2262 pktopt->ip6po_nexthop = NULL;
2263 }
2264 if (optname == -1 || optname == IPV6_HOPOPTS) {
2265 if (pktopt->ip6po_hbh)
2266 free(pktopt->ip6po_hbh, M_IP6OPT);
2267 pktopt->ip6po_hbh = NULL;
2268 }
2269 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2270 if (pktopt->ip6po_dest1)
2271 free(pktopt->ip6po_dest1, M_IP6OPT);
2272 pktopt->ip6po_dest1 = NULL;
2273 }
2274 if (optname == -1 || optname == IPV6_RTHDR) {
2275 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2276 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2277 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2278 if (pktopt->ip6po_route.ro_rt) {
2279 RTFREE(pktopt->ip6po_route.ro_rt);
2280 pktopt->ip6po_route.ro_rt = NULL;
2281 }
2282 }
2283 if (optname == -1 || optname == IPV6_DSTOPTS) {
2284 if (pktopt->ip6po_dest2)
2285 free(pktopt->ip6po_dest2, M_IP6OPT);
2286 pktopt->ip6po_dest2 = NULL;
2287 }
2288 }
2289
2290 #define PKTOPT_EXTHDRCPY(type) \
2291 do {\
2292 if (src->type) {\
2293 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2294 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2295 if (dst->type == NULL && canwait == M_NOWAIT)\
2296 goto bad;\
2297 bcopy(src->type, dst->type, hlen);\
2298 }\
2299 } while (/*CONSTCOND*/ 0)
2300
2301 static int
2302 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2303 {
2304 if (dst == NULL || src == NULL) {
2305 printf("ip6_clearpktopts: invalid argument\n");
2306 return (EINVAL);
2307 }
2308
2309 dst->ip6po_hlim = src->ip6po_hlim;
2310 dst->ip6po_tclass = src->ip6po_tclass;
2311 dst->ip6po_flags = src->ip6po_flags;
2312 if (src->ip6po_pktinfo) {
2313 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2314 M_IP6OPT, canwait);
2315 if (dst->ip6po_pktinfo == NULL)
2316 goto bad;
2317 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2318 }
2319 if (src->ip6po_nexthop) {
2320 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2321 M_IP6OPT, canwait);
2322 if (dst->ip6po_nexthop == NULL)
2323 goto bad;
2324 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2325 src->ip6po_nexthop->sa_len);
2326 }
2327 PKTOPT_EXTHDRCPY(ip6po_hbh);
2328 PKTOPT_EXTHDRCPY(ip6po_dest1);
2329 PKTOPT_EXTHDRCPY(ip6po_dest2);
2330 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2331 return (0);
2332
2333 bad:
2334 ip6_clearpktopts(dst, -1);
2335 return (ENOBUFS);
2336 }
2337 #undef PKTOPT_EXTHDRCPY
2338
2339 struct ip6_pktopts *
2340 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2341 {
2342 int error;
2343 struct ip6_pktopts *dst;
2344
2345 dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2346 if (dst == NULL)
2347 return (NULL);
2348 ip6_initpktopts(dst);
2349
2350 if ((error = copypktopts(dst, src, canwait)) != 0) {
2351 free(dst, M_IP6OPT);
2352 return (NULL);
2353 }
2354
2355 return (dst);
2356 }
2357
2358 void
2359 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2360 {
2361 if (pktopt == NULL)
2362 return;
2363
2364 ip6_clearpktopts(pktopt, -1);
2365
2366 free(pktopt, M_IP6OPT);
2367 }
2368
2369 /*
2370 * Set IPv6 outgoing packet options based on advanced API.
2371 */
2372 int
2373 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2374 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2375 {
2376 struct cmsghdr *cm = 0;
2377
2378 if (control == NULL || opt == NULL)
2379 return (EINVAL);
2380
2381 ip6_initpktopts(opt);
2382 if (stickyopt) {
2383 int error;
2384
2385 /*
2386 * If stickyopt is provided, make a local copy of the options
2387 * for this particular packet, then override them by ancillary
2388 * objects.
2389 * XXX: copypktopts() does not copy the cached route to a next
2390 * hop (if any). This is not very good in terms of efficiency,
2391 * but we can allow this since this option should be rarely
2392 * used.
2393 */
2394 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2395 return (error);
2396 }
2397
2398 /*
2399 * XXX: Currently, we assume all the optional information is stored
2400 * in a single mbuf.
2401 */
2402 if (control->m_next)
2403 return (EINVAL);
2404
2405 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2406 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2407 int error;
2408
2409 if (control->m_len < CMSG_LEN(0))
2410 return (EINVAL);
2411
2412 cm = mtod(control, struct cmsghdr *);
2413 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2414 return (EINVAL);
2415 if (cm->cmsg_level != IPPROTO_IPV6)
2416 continue;
2417
2418 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2419 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2420 if (error)
2421 return (error);
2422 }
2423
2424 return (0);
2425 }
2426
2427 /*
2428 * Set a particular packet option, as a sticky option or an ancillary data
2429 * item. "len" can be 0 only when it's a sticky option.
2430 * We have 4 cases of combination of "sticky" and "cmsg":
2431 * "sticky=0, cmsg=0": impossible
2432 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2433 * "sticky=1, cmsg=0": RFC3542 socket option
2434 * "sticky=1, cmsg=1": RFC2292 socket option
2435 */
2436 static int
2437 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2438 struct ucred *cred, int sticky, int cmsg, int uproto)
2439 {
2440 int minmtupolicy, preftemp;
2441 int error;
2442
2443 if (!sticky && !cmsg) {
2444 #ifdef DIAGNOSTIC
2445 printf("ip6_setpktopt: impossible case\n");
2446 #endif
2447 return (EINVAL);
2448 }
2449
2450 /*
2451 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2452 * not be specified in the context of RFC3542. Conversely,
2453 * RFC3542 types should not be specified in the context of RFC2292.
2454 */
2455 if (!cmsg) {
2456 switch (optname) {
2457 case IPV6_2292PKTINFO:
2458 case IPV6_2292HOPLIMIT:
2459 case IPV6_2292NEXTHOP:
2460 case IPV6_2292HOPOPTS:
2461 case IPV6_2292DSTOPTS:
2462 case IPV6_2292RTHDR:
2463 case IPV6_2292PKTOPTIONS:
2464 return (ENOPROTOOPT);
2465 }
2466 }
2467 if (sticky && cmsg) {
2468 switch (optname) {
2469 case IPV6_PKTINFO:
2470 case IPV6_HOPLIMIT:
2471 case IPV6_NEXTHOP:
2472 case IPV6_HOPOPTS:
2473 case IPV6_DSTOPTS:
2474 case IPV6_RTHDRDSTOPTS:
2475 case IPV6_RTHDR:
2476 case IPV6_USE_MIN_MTU:
2477 case IPV6_DONTFRAG:
2478 case IPV6_TCLASS:
2479 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2480 return (ENOPROTOOPT);
2481 }
2482 }
2483
2484 switch (optname) {
2485 case IPV6_2292PKTINFO:
2486 case IPV6_PKTINFO:
2487 {
2488 struct ifnet *ifp = NULL;
2489 struct in6_pktinfo *pktinfo;
2490
2491 if (len != sizeof(struct in6_pktinfo))
2492 return (EINVAL);
2493
2494 pktinfo = (struct in6_pktinfo *)buf;
2495
2496 /*
2497 * An application can clear any sticky IPV6_PKTINFO option by
2498 * doing a "regular" setsockopt with ipi6_addr being
2499 * in6addr_any and ipi6_ifindex being zero.
2500 * [RFC 3542, Section 6]
2501 */
2502 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2503 pktinfo->ipi6_ifindex == 0 &&
2504 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2505 ip6_clearpktopts(opt, optname);
2506 break;
2507 }
2508
2509 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2510 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2511 return (EINVAL);
2512 }
2513
2514 /* validate the interface index if specified. */
2515 if (pktinfo->ipi6_ifindex > V_if_index ||
2516 pktinfo->ipi6_ifindex < 0) {
2517 return (ENXIO);
2518 }
2519 if (pktinfo->ipi6_ifindex) {
2520 ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2521 if (ifp == NULL)
2522 return (ENXIO);
2523 }
2524
2525 /*
2526 * We store the address anyway, and let in6_selectsrc()
2527 * validate the specified address. This is because ipi6_addr
2528 * may not have enough information about its scope zone, and
2529 * we may need additional information (such as outgoing
2530 * interface or the scope zone of a destination address) to
2531 * disambiguate the scope.
2532 * XXX: the delay of the validation may confuse the
2533 * application when it is used as a sticky option.
2534 */
2535 if (opt->ip6po_pktinfo == NULL) {
2536 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2537 M_IP6OPT, M_NOWAIT);
2538 if (opt->ip6po_pktinfo == NULL)
2539 return (ENOBUFS);
2540 }
2541 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2542 break;
2543 }
2544
2545 case IPV6_2292HOPLIMIT:
2546 case IPV6_HOPLIMIT:
2547 {
2548 int *hlimp;
2549
2550 /*
2551 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2552 * to simplify the ordering among hoplimit options.
2553 */
2554 if (optname == IPV6_HOPLIMIT && sticky)
2555 return (ENOPROTOOPT);
2556
2557 if (len != sizeof(int))
2558 return (EINVAL);
2559 hlimp = (int *)buf;
2560 if (*hlimp < -1 || *hlimp > 255)
2561 return (EINVAL);
2562
2563 opt->ip6po_hlim = *hlimp;
2564 break;
2565 }
2566
2567 case IPV6_TCLASS:
2568 {
2569 int tclass;
2570
2571 if (len != sizeof(int))
2572 return (EINVAL);
2573 tclass = *(int *)buf;
2574 if (tclass < -1 || tclass > 255)
2575 return (EINVAL);
2576
2577 opt->ip6po_tclass = tclass;
2578 break;
2579 }
2580
2581 case IPV6_2292NEXTHOP:
2582 case IPV6_NEXTHOP:
2583 if (cred != NULL) {
2584 error = priv_check_cred(cred,
2585 PRIV_NETINET_SETHDROPTS, 0);
2586 if (error)
2587 return (error);
2588 }
2589
2590 if (len == 0) { /* just remove the option */
2591 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2592 break;
2593 }
2594
2595 /* check if cmsg_len is large enough for sa_len */
2596 if (len < sizeof(struct sockaddr) || len < *buf)
2597 return (EINVAL);
2598
2599 switch (((struct sockaddr *)buf)->sa_family) {
2600 case AF_INET6:
2601 {
2602 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
2603 int error;
2604
2605 if (sa6->sin6_len != sizeof(struct sockaddr_in6))
2606 return (EINVAL);
2607
2608 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
2609 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
2610 return (EINVAL);
2611 }
2612 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
2613 != 0) {
2614 return (error);
2615 }
2616 break;
2617 }
2618 case AF_LINK: /* should eventually be supported */
2619 default:
2620 return (EAFNOSUPPORT);
2621 }
2622
2623 /* turn off the previous option, then set the new option. */
2624 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2625 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
2626 if (opt->ip6po_nexthop == NULL)
2627 return (ENOBUFS);
2628 bcopy(buf, opt->ip6po_nexthop, *buf);
2629 break;
2630
2631 case IPV6_2292HOPOPTS:
2632 case IPV6_HOPOPTS:
2633 {
2634 struct ip6_hbh *hbh;
2635 int hbhlen;
2636
2637 /*
2638 * XXX: We don't allow a non-privileged user to set ANY HbH
2639 * options, since per-option restriction has too much
2640 * overhead.
2641 */
2642 if (cred != NULL) {
2643 error = priv_check_cred(cred,
2644 PRIV_NETINET_SETHDROPTS, 0);
2645 if (error)
2646 return (error);
2647 }
2648
2649 if (len == 0) {
2650 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2651 break; /* just remove the option */
2652 }
2653
2654 /* message length validation */
2655 if (len < sizeof(struct ip6_hbh))
2656 return (EINVAL);
2657 hbh = (struct ip6_hbh *)buf;
2658 hbhlen = (hbh->ip6h_len + 1) << 3;
2659 if (len != hbhlen)
2660 return (EINVAL);
2661
2662 /* turn off the previous option, then set the new option. */
2663 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2664 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
2665 if (opt->ip6po_hbh == NULL)
2666 return (ENOBUFS);
2667 bcopy(hbh, opt->ip6po_hbh, hbhlen);
2668
2669 break;
2670 }
2671
2672 case IPV6_2292DSTOPTS:
2673 case IPV6_DSTOPTS:
2674 case IPV6_RTHDRDSTOPTS:
2675 {
2676 struct ip6_dest *dest, **newdest = NULL;
2677 int destlen;
2678
2679 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
2680 error = priv_check_cred(cred,
2681 PRIV_NETINET_SETHDROPTS, 0);
2682 if (error)
2683 return (error);
2684 }
2685
2686 if (len == 0) {
2687 ip6_clearpktopts(opt, optname);
2688 break; /* just remove the option */
2689 }
2690
2691 /* message length validation */
2692 if (len < sizeof(struct ip6_dest))
2693 return (EINVAL);
2694 dest = (struct ip6_dest *)buf;
2695 destlen = (dest->ip6d_len + 1) << 3;
2696 if (len != destlen)
2697 return (EINVAL);
2698
2699 /*
2700 * Determine the position that the destination options header
2701 * should be inserted; before or after the routing header.
2702 */
2703 switch (optname) {
2704 case IPV6_2292DSTOPTS:
2705 /*
2706 * The old advacned API is ambiguous on this point.
2707 * Our approach is to determine the position based
2708 * according to the existence of a routing header.
2709 * Note, however, that this depends on the order of the
2710 * extension headers in the ancillary data; the 1st
2711 * part of the destination options header must appear
2712 * before the routing header in the ancillary data,
2713 * too.
2714 * RFC3542 solved the ambiguity by introducing
2715 * separate ancillary data or option types.
2716 */
2717 if (opt->ip6po_rthdr == NULL)
2718 newdest = &opt->ip6po_dest1;
2719 else
2720 newdest = &opt->ip6po_dest2;
2721 break;
2722 case IPV6_RTHDRDSTOPTS:
2723 newdest = &opt->ip6po_dest1;
2724 break;
2725 case IPV6_DSTOPTS:
2726 newdest = &opt->ip6po_dest2;
2727 break;
2728 }
2729
2730 /* turn off the previous option, then set the new option. */
2731 ip6_clearpktopts(opt, optname);
2732 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
2733 if (*newdest == NULL)
2734 return (ENOBUFS);
2735 bcopy(dest, *newdest, destlen);
2736
2737 break;
2738 }
2739
2740 case IPV6_2292RTHDR:
2741 case IPV6_RTHDR:
2742 {
2743 struct ip6_rthdr *rth;
2744 int rthlen;
2745
2746 if (len == 0) {
2747 ip6_clearpktopts(opt, IPV6_RTHDR);
2748 break; /* just remove the option */
2749 }
2750
2751 /* message length validation */
2752 if (len < sizeof(struct ip6_rthdr))
2753 return (EINVAL);
2754 rth = (struct ip6_rthdr *)buf;
2755 rthlen = (rth->ip6r_len + 1) << 3;
2756 if (len != rthlen)
2757 return (EINVAL);
2758
2759 switch (rth->ip6r_type) {
2760 case IPV6_RTHDR_TYPE_0:
2761 if (rth->ip6r_len == 0) /* must contain one addr */
2762 return (EINVAL);
2763 if (rth->ip6r_len % 2) /* length must be even */
2764 return (EINVAL);
2765 if (rth->ip6r_len / 2 != rth->ip6r_segleft)
2766 return (EINVAL);
2767 break;
2768 default:
2769 return (EINVAL); /* not supported */
2770 }
2771
2772 /* turn off the previous option */
2773 ip6_clearpktopts(opt, IPV6_RTHDR);
2774 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
2775 if (opt->ip6po_rthdr == NULL)
2776 return (ENOBUFS);
2777 bcopy(rth, opt->ip6po_rthdr, rthlen);
2778
2779 break;
2780 }
2781
2782 case IPV6_USE_MIN_MTU:
2783 if (len != sizeof(int))
2784 return (EINVAL);
2785 minmtupolicy = *(int *)buf;
2786 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
2787 minmtupolicy != IP6PO_MINMTU_DISABLE &&
2788 minmtupolicy != IP6PO_MINMTU_ALL) {
2789 return (EINVAL);
2790 }
2791 opt->ip6po_minmtu = minmtupolicy;
2792 break;
2793
2794 case IPV6_DONTFRAG:
2795 if (len != sizeof(int))
2796 return (EINVAL);
2797
2798 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
2799 /*
2800 * we ignore this option for TCP sockets.
2801 * (RFC3542 leaves this case unspecified.)
2802 */
2803 opt->ip6po_flags &= ~IP6PO_DONTFRAG;
2804 } else
2805 opt->ip6po_flags |= IP6PO_DONTFRAG;
2806 break;
2807
2808 case IPV6_PREFER_TEMPADDR:
2809 if (len != sizeof(int))
2810 return (EINVAL);
2811 preftemp = *(int *)buf;
2812 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
2813 preftemp != IP6PO_TEMPADDR_NOTPREFER &&
2814 preftemp != IP6PO_TEMPADDR_PREFER) {
2815 return (EINVAL);
2816 }
2817 opt->ip6po_prefer_tempaddr = preftemp;
2818 break;
2819
2820 default:
2821 return (ENOPROTOOPT);
2822 } /* end of switch */
2823
2824 return (0);
2825 }
2826
2827 /*
2828 * Routine called from ip6_output() to loop back a copy of an IP6 multicast
2829 * packet to the input queue of a specified interface. Note that this
2830 * calls the output routine of the loopback "driver", but with an interface
2831 * pointer that might NOT be &loif -- easier than replicating that code here.
2832 */
2833 void
2834 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst)
2835 {
2836 struct mbuf *copym;
2837 struct ip6_hdr *ip6;
2838
2839 copym = m_copy(m, 0, M_COPYALL);
2840 if (copym == NULL)
2841 return;
2842
2843 /*
2844 * Make sure to deep-copy IPv6 header portion in case the data
2845 * is in an mbuf cluster, so that we can safely override the IPv6
2846 * header portion later.
2847 */
2848 if ((copym->m_flags & M_EXT) != 0 ||
2849 copym->m_len < sizeof(struct ip6_hdr)) {
2850 copym = m_pullup(copym, sizeof(struct ip6_hdr));
2851 if (copym == NULL)
2852 return;
2853 }
2854
2855 #ifdef DIAGNOSTIC
2856 if (copym->m_len < sizeof(*ip6)) {
2857 m_freem(copym);
2858 return;
2859 }
2860 #endif
2861
2862 ip6 = mtod(copym, struct ip6_hdr *);
2863 /*
2864 * clear embedded scope identifiers if necessary.
2865 * in6_clearscope will touch the addresses only when necessary.
2866 */
2867 in6_clearscope(&ip6->ip6_src);
2868 in6_clearscope(&ip6->ip6_dst);
2869
2870 (void)if_simloop(ifp, copym, dst->sin6_family, 0);
2871 }
2872
2873 /*
2874 * Chop IPv6 header off from the payload.
2875 */
2876 static int
2877 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
2878 {
2879 struct mbuf *mh;
2880 struct ip6_hdr *ip6;
2881
2882 ip6 = mtod(m, struct ip6_hdr *);
2883 if (m->m_len > sizeof(*ip6)) {
2884 MGETHDR(mh, M_DONTWAIT, MT_HEADER);
2885 if (mh == 0) {
2886 m_freem(m);
2887 return ENOBUFS;
2888 }
2889 M_MOVE_PKTHDR(mh, m);
2890 MH_ALIGN(mh, sizeof(*ip6));
2891 m->m_len -= sizeof(*ip6);
2892 m->m_data += sizeof(*ip6);
2893 mh->m_next = m;
2894 m = mh;
2895 m->m_len = sizeof(*ip6);
2896 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
2897 }
2898 exthdrs->ip6e_ip6 = m;
2899 return 0;
2900 }
2901
2902 /*
2903 * Compute IPv6 extension header length.
2904 */
2905 int
2906 ip6_optlen(struct inpcb *in6p)
2907 {
2908 int len;
2909
2910 if (!in6p->in6p_outputopts)
2911 return 0;
2912
2913 len = 0;
2914 #define elen(x) \
2915 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
2916
2917 len += elen(in6p->in6p_outputopts->ip6po_hbh);
2918 if (in6p->in6p_outputopts->ip6po_rthdr)
2919 /* dest1 is valid with rthdr only */
2920 len += elen(in6p->in6p_outputopts->ip6po_dest1);
2921 len += elen(in6p->in6p_outputopts->ip6po_rthdr);
2922 len += elen(in6p->in6p_outputopts->ip6po_dest2);
2923 return len;
2924 #undef elen
2925 }
Cache object: 78b7c08d8739fa2cd956f2e1492600ed
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