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/10.1/sys/netinet6/ip6_output.c 293894 2016-01-14 09:11:16Z glebius $");
65
66 #include "opt_inet.h"
67 #include "opt_inet6.h"
68 #include "opt_ipfw.h"
69 #include "opt_ipsec.h"
70 #include "opt_sctp.h"
71 #include "opt_route.h"
72
73 #include <sys/param.h>
74 #include <sys/kernel.h>
75 #include <sys/malloc.h>
76 #include <sys/mbuf.h>
77 #include <sys/errno.h>
78 #include <sys/priv.h>
79 #include <sys/proc.h>
80 #include <sys/protosw.h>
81 #include <sys/socket.h>
82 #include <sys/socketvar.h>
83 #include <sys/syslog.h>
84 #include <sys/ucred.h>
85
86 #include <machine/in_cksum.h>
87
88 #include <net/if.h>
89 #include <net/netisr.h>
90 #include <net/route.h>
91 #include <net/pfil.h>
92 #include <net/vnet.h>
93
94 #include <netinet/in.h>
95 #include <netinet/in_var.h>
96 #include <netinet/ip_var.h>
97 #include <netinet6/in6_var.h>
98 #include <netinet/ip6.h>
99 #include <netinet/icmp6.h>
100 #include <netinet6/ip6_var.h>
101 #include <netinet/in_pcb.h>
102 #include <netinet/tcp_var.h>
103 #include <netinet6/nd6.h>
104
105 #ifdef IPSEC
106 #include <netipsec/ipsec.h>
107 #include <netipsec/ipsec6.h>
108 #include <netipsec/key.h>
109 #include <netinet6/ip6_ipsec.h>
110 #endif /* IPSEC */
111 #ifdef SCTP
112 #include <netinet/sctp.h>
113 #include <netinet/sctp_crc32.h>
114 #endif
115
116 #include <netinet6/ip6protosw.h>
117 #include <netinet6/scope6_var.h>
118
119 #ifdef FLOWTABLE
120 #include <net/flowtable.h>
121 #endif
122
123 extern int in6_mcast_loop;
124
125 struct ip6_exthdrs {
126 struct mbuf *ip6e_ip6;
127 struct mbuf *ip6e_hbh;
128 struct mbuf *ip6e_dest1;
129 struct mbuf *ip6e_rthdr;
130 struct mbuf *ip6e_dest2;
131 };
132
133 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **,
134 struct ucred *, int);
135 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *,
136 struct socket *, struct sockopt *);
137 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *);
138 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *,
139 struct ucred *, int, int, int);
140
141 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
142 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
143 struct ip6_frag **);
144 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
145 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
146 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *,
147 struct ifnet *, struct in6_addr *, u_long *, int *, u_int);
148 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
149
150
151 /*
152 * Make an extension header from option data. hp is the source, and
153 * mp is the destination.
154 */
155 #define MAKE_EXTHDR(hp, mp) \
156 do { \
157 if (hp) { \
158 struct ip6_ext *eh = (struct ip6_ext *)(hp); \
159 error = ip6_copyexthdr((mp), (caddr_t)(hp), \
160 ((eh)->ip6e_len + 1) << 3); \
161 if (error) \
162 goto freehdrs; \
163 } \
164 } while (/*CONSTCOND*/ 0)
165
166 /*
167 * Form a chain of extension headers.
168 * m is the extension header mbuf
169 * mp is the previous mbuf in the chain
170 * p is the next header
171 * i is the type of option.
172 */
173 #define MAKE_CHAIN(m, mp, p, i)\
174 do {\
175 if (m) {\
176 if (!hdrsplit) \
177 panic("assumption failed: hdr not split"); \
178 *mtod((m), u_char *) = *(p);\
179 *(p) = (i);\
180 p = mtod((m), u_char *);\
181 (m)->m_next = (mp)->m_next;\
182 (mp)->m_next = (m);\
183 (mp) = (m);\
184 }\
185 } while (/*CONSTCOND*/ 0)
186
187 void
188 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
189 {
190 u_short csum;
191
192 csum = in_cksum_skip(m, offset + plen, offset);
193 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
194 csum = 0xffff;
195 offset += m->m_pkthdr.csum_data; /* checksum offset */
196
197 if (offset + sizeof(u_short) > m->m_len) {
198 printf("%s: delayed m_pullup, m->len: %d plen %u off %u "
199 "csum_flags=%b\n", __func__, m->m_len, plen, offset,
200 (int)m->m_pkthdr.csum_flags, CSUM_BITS);
201 /*
202 * XXX this should not happen, but if it does, the correct
203 * behavior may be to insert the checksum in the appropriate
204 * next mbuf in the chain.
205 */
206 return;
207 }
208 *(u_short *)(m->m_data + offset) = csum;
209 }
210
211 /*
212 * IP6 output. The packet in mbuf chain m contains a skeletal IP6
213 * header (with pri, len, nxt, hlim, src, dst).
214 * This function may modify ver and hlim only.
215 * The mbuf chain containing the packet will be freed.
216 * The mbuf opt, if present, will not be freed.
217 * If route_in6 ro is present and has ro_rt initialized, route lookup would be
218 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
219 * then result of route lookup is stored in ro->ro_rt.
220 *
221 * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and
222 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one,
223 * which is rt_mtu.
224 *
225 * ifpp - XXX: just for statistics
226 */
227 int
228 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
229 struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
230 struct ifnet **ifpp, struct inpcb *inp)
231 {
232 struct ip6_hdr *ip6, *mhip6;
233 struct ifnet *ifp, *origifp;
234 struct mbuf *m = m0;
235 struct mbuf *mprev = NULL;
236 int hlen, tlen, len, off;
237 struct route_in6 ip6route;
238 struct rtentry *rt = NULL;
239 struct sockaddr_in6 *dst, src_sa, dst_sa;
240 struct in6_addr odst;
241 int error = 0;
242 struct in6_ifaddr *ia = NULL;
243 u_long mtu;
244 int alwaysfrag, dontfrag;
245 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
246 struct ip6_exthdrs exthdrs;
247 struct in6_addr finaldst, src0, dst0;
248 u_int32_t zone;
249 struct route_in6 *ro_pmtu = NULL;
250 int hdrsplit = 0;
251 int needipsec = 0;
252 int sw_csum, tso;
253 #ifdef IPSEC
254 struct ipsec_output_state state;
255 struct ip6_rthdr *rh = NULL;
256 int needipsectun = 0;
257 int segleft_org = 0;
258 struct secpolicy *sp = NULL;
259 #endif /* IPSEC */
260 struct m_tag *fwd_tag = NULL;
261
262 ip6 = mtod(m, struct ip6_hdr *);
263 if (ip6 == NULL) {
264 printf ("ip6 is NULL");
265 goto bad;
266 }
267
268 if (inp != NULL)
269 M_SETFIB(m, inp->inp_inc.inc_fibnum);
270
271 finaldst = ip6->ip6_dst;
272 bzero(&exthdrs, sizeof(exthdrs));
273 if (opt) {
274 /* Hop-by-Hop options header */
275 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
276 /* Destination options header(1st part) */
277 if (opt->ip6po_rthdr) {
278 /*
279 * Destination options header(1st part)
280 * This only makes sense with a routing header.
281 * See Section 9.2 of RFC 3542.
282 * Disabling this part just for MIP6 convenience is
283 * a bad idea. We need to think carefully about a
284 * way to make the advanced API coexist with MIP6
285 * options, which might automatically be inserted in
286 * the kernel.
287 */
288 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
289 }
290 /* Routing header */
291 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
292 /* Destination options header(2nd part) */
293 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
294 }
295
296 #ifdef IPSEC
297 /*
298 * IPSec checking which handles several cases.
299 * FAST IPSEC: We re-injected the packet.
300 */
301 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp, &sp))
302 {
303 case 1: /* Bad packet */
304 goto freehdrs;
305 case -1: /* Do IPSec */
306 needipsec = 1;
307 /*
308 * Do delayed checksums now, as we may send before returning.
309 */
310 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
311 plen = m->m_pkthdr.len - sizeof(*ip6);
312 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
313 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
314 }
315 #ifdef SCTP
316 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
317 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
318 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
319 }
320 #endif
321 case 0: /* No IPSec */
322 default:
323 break;
324 }
325 #endif /* IPSEC */
326
327 /*
328 * Calculate the total length of the extension header chain.
329 * Keep the length of the unfragmentable part for fragmentation.
330 */
331 optlen = 0;
332 if (exthdrs.ip6e_hbh)
333 optlen += exthdrs.ip6e_hbh->m_len;
334 if (exthdrs.ip6e_dest1)
335 optlen += exthdrs.ip6e_dest1->m_len;
336 if (exthdrs.ip6e_rthdr)
337 optlen += exthdrs.ip6e_rthdr->m_len;
338 unfragpartlen = optlen + sizeof(struct ip6_hdr);
339
340 /* NOTE: we don't add AH/ESP length here. do that later. */
341 if (exthdrs.ip6e_dest2)
342 optlen += exthdrs.ip6e_dest2->m_len;
343
344 /*
345 * If we need IPsec, or there is at least one extension header,
346 * separate IP6 header from the payload.
347 */
348 if ((needipsec || optlen) && !hdrsplit) {
349 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
350 m = NULL;
351 goto freehdrs;
352 }
353 m = exthdrs.ip6e_ip6;
354 hdrsplit++;
355 }
356
357 /* adjust pointer */
358 ip6 = mtod(m, struct ip6_hdr *);
359
360 /* adjust mbuf packet header length */
361 m->m_pkthdr.len += optlen;
362 plen = m->m_pkthdr.len - sizeof(*ip6);
363
364 /* If this is a jumbo payload, insert a jumbo payload option. */
365 if (plen > IPV6_MAXPACKET) {
366 if (!hdrsplit) {
367 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
368 m = NULL;
369 goto freehdrs;
370 }
371 m = exthdrs.ip6e_ip6;
372 hdrsplit++;
373 }
374 /* adjust pointer */
375 ip6 = mtod(m, struct ip6_hdr *);
376 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
377 goto freehdrs;
378 ip6->ip6_plen = 0;
379 } else
380 ip6->ip6_plen = htons(plen);
381
382 /*
383 * Concatenate headers and fill in next header fields.
384 * Here we have, on "m"
385 * IPv6 payload
386 * and we insert headers accordingly. Finally, we should be getting:
387 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
388 *
389 * during the header composing process, "m" points to IPv6 header.
390 * "mprev" points to an extension header prior to esp.
391 */
392 u_char *nexthdrp = &ip6->ip6_nxt;
393 mprev = m;
394
395 /*
396 * we treat dest2 specially. this makes IPsec processing
397 * much easier. the goal here is to make mprev point the
398 * mbuf prior to dest2.
399 *
400 * result: IPv6 dest2 payload
401 * m and mprev will point to IPv6 header.
402 */
403 if (exthdrs.ip6e_dest2) {
404 if (!hdrsplit)
405 panic("assumption failed: hdr not split");
406 exthdrs.ip6e_dest2->m_next = m->m_next;
407 m->m_next = exthdrs.ip6e_dest2;
408 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
409 ip6->ip6_nxt = IPPROTO_DSTOPTS;
410 }
411
412 /*
413 * result: IPv6 hbh dest1 rthdr dest2 payload
414 * m will point to IPv6 header. mprev will point to the
415 * extension header prior to dest2 (rthdr in the above case).
416 */
417 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
418 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
419 IPPROTO_DSTOPTS);
420 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
421 IPPROTO_ROUTING);
422
423 #ifdef IPSEC
424 if (!needipsec)
425 goto skip_ipsec2;
426
427 /*
428 * pointers after IPsec headers are not valid any more.
429 * other pointers need a great care too.
430 * (IPsec routines should not mangle mbufs prior to AH/ESP)
431 */
432 exthdrs.ip6e_dest2 = NULL;
433
434 if (exthdrs.ip6e_rthdr) {
435 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *);
436 segleft_org = rh->ip6r_segleft;
437 rh->ip6r_segleft = 0;
438 }
439
440 bzero(&state, sizeof(state));
441 state.m = m;
442 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags,
443 &needipsectun);
444 m = state.m;
445 if (error == EJUSTRETURN) {
446 /*
447 * We had a SP with a level of 'use' and no SA. We
448 * will just continue to process the packet without
449 * IPsec processing.
450 */
451 ;
452 } else if (error) {
453 /* mbuf is already reclaimed in ipsec6_output_trans. */
454 m = NULL;
455 switch (error) {
456 case EHOSTUNREACH:
457 case ENETUNREACH:
458 case EMSGSIZE:
459 case ENOBUFS:
460 case ENOMEM:
461 break;
462 default:
463 printf("[%s:%d] (ipsec): error code %d\n",
464 __func__, __LINE__, error);
465 /* FALLTHROUGH */
466 case ENOENT:
467 /* don't show these error codes to the user */
468 error = 0;
469 break;
470 }
471 goto bad;
472 } else if (!needipsectun) {
473 /*
474 * In the FAST IPSec case we have already
475 * re-injected the packet and it has been freed
476 * by the ipsec_done() function. So, just clean
477 * up after ourselves.
478 */
479 m = NULL;
480 goto done;
481 }
482 if (exthdrs.ip6e_rthdr) {
483 /* ah6_output doesn't modify mbuf chain */
484 rh->ip6r_segleft = segleft_org;
485 }
486 skip_ipsec2:;
487 #endif /* IPSEC */
488
489 /*
490 * If there is a routing header, discard the packet.
491 */
492 if (exthdrs.ip6e_rthdr) {
493 error = EINVAL;
494 goto bad;
495 }
496
497 /* Source address validation */
498 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
499 (flags & IPV6_UNSPECSRC) == 0) {
500 error = EOPNOTSUPP;
501 IP6STAT_INC(ip6s_badscope);
502 goto bad;
503 }
504 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
505 error = EOPNOTSUPP;
506 IP6STAT_INC(ip6s_badscope);
507 goto bad;
508 }
509
510 IP6STAT_INC(ip6s_localout);
511
512 /*
513 * Route packet.
514 */
515 if (ro == 0) {
516 ro = &ip6route;
517 bzero((caddr_t)ro, sizeof(*ro));
518 }
519 ro_pmtu = ro;
520 if (opt && opt->ip6po_rthdr)
521 ro = &opt->ip6po_route;
522 dst = (struct sockaddr_in6 *)&ro->ro_dst;
523 #ifdef FLOWTABLE
524 if (ro->ro_rt == NULL)
525 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro);
526 #endif
527 again:
528 /*
529 * if specified, try to fill in the traffic class field.
530 * do not override if a non-zero value is already set.
531 * we check the diffserv field and the ecn field separately.
532 */
533 if (opt && opt->ip6po_tclass >= 0) {
534 int mask = 0;
535
536 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
537 mask |= 0xfc;
538 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
539 mask |= 0x03;
540 if (mask != 0)
541 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
542 }
543
544 /* fill in or override the hop limit field, if necessary. */
545 if (opt && opt->ip6po_hlim != -1)
546 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
547 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
548 if (im6o != NULL)
549 ip6->ip6_hlim = im6o->im6o_multicast_hlim;
550 else
551 ip6->ip6_hlim = V_ip6_defmcasthlim;
552 }
553
554 #ifdef IPSEC
555 /*
556 * We may re-inject packets into the stack here.
557 */
558 if (needipsec && needipsectun) {
559 struct ipsec_output_state state;
560
561 /*
562 * All the extension headers will become inaccessible
563 * (since they can be encrypted).
564 * Don't panic, we need no more updates to extension headers
565 * on inner IPv6 packet (since they are now encapsulated).
566 *
567 * IPv6 [ESP|AH] IPv6 [extension headers] payload
568 */
569 bzero(&exthdrs, sizeof(exthdrs));
570 exthdrs.ip6e_ip6 = m;
571
572 bzero(&state, sizeof(state));
573 state.m = m;
574 state.ro = (struct route *)ro;
575 state.dst = (struct sockaddr *)dst;
576
577 error = ipsec6_output_tunnel(&state, sp, flags);
578
579 m = state.m;
580 ro = (struct route_in6 *)state.ro;
581 dst = (struct sockaddr_in6 *)state.dst;
582 if (error == EJUSTRETURN) {
583 /*
584 * We had a SP with a level of 'use' and no SA. We
585 * will just continue to process the packet without
586 * IPsec processing.
587 */
588 ;
589 } else if (error) {
590 /* mbuf is already reclaimed in ipsec6_output_tunnel. */
591 m0 = m = NULL;
592 m = NULL;
593 switch (error) {
594 case EHOSTUNREACH:
595 case ENETUNREACH:
596 case EMSGSIZE:
597 case ENOBUFS:
598 case ENOMEM:
599 break;
600 default:
601 printf("[%s:%d] (ipsec): error code %d\n",
602 __func__, __LINE__, error);
603 /* FALLTHROUGH */
604 case ENOENT:
605 /* don't show these error codes to the user */
606 error = 0;
607 break;
608 }
609 goto bad;
610 } else {
611 /*
612 * In the FAST IPSec case we have already
613 * re-injected the packet and it has been freed
614 * by the ipsec_done() function. So, just clean
615 * up after ourselves.
616 */
617 m = NULL;
618 goto done;
619 }
620
621 exthdrs.ip6e_ip6 = m;
622 }
623 #endif /* IPSEC */
624
625 /* adjust pointer */
626 ip6 = mtod(m, struct ip6_hdr *);
627
628 if (ro->ro_rt && fwd_tag == NULL) {
629 rt = ro->ro_rt;
630 ifp = ro->ro_rt->rt_ifp;
631 } else {
632 if (fwd_tag == NULL) {
633 bzero(&dst_sa, sizeof(dst_sa));
634 dst_sa.sin6_family = AF_INET6;
635 dst_sa.sin6_len = sizeof(dst_sa);
636 dst_sa.sin6_addr = ip6->ip6_dst;
637 }
638 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp,
639 &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m));
640 if (error != 0) {
641 if (ifp != NULL)
642 in6_ifstat_inc(ifp, ifs6_out_discard);
643 goto bad;
644 }
645 }
646 if (rt == NULL) {
647 /*
648 * If in6_selectroute() does not return a route entry,
649 * dst may not have been updated.
650 */
651 *dst = dst_sa; /* XXX */
652 }
653
654 /*
655 * then rt (for unicast) and ifp must be non-NULL valid values.
656 */
657 if ((flags & IPV6_FORWARDING) == 0) {
658 /* XXX: the FORWARDING flag can be set for mrouting. */
659 in6_ifstat_inc(ifp, ifs6_out_request);
660 }
661 if (rt != NULL) {
662 ia = (struct in6_ifaddr *)(rt->rt_ifa);
663 counter_u64_add(rt->rt_pksent, 1);
664 }
665
666
667 /*
668 * The outgoing interface must be in the zone of source and
669 * destination addresses.
670 */
671 origifp = ifp;
672
673 src0 = ip6->ip6_src;
674 if (in6_setscope(&src0, origifp, &zone))
675 goto badscope;
676 bzero(&src_sa, sizeof(src_sa));
677 src_sa.sin6_family = AF_INET6;
678 src_sa.sin6_len = sizeof(src_sa);
679 src_sa.sin6_addr = ip6->ip6_src;
680 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
681 goto badscope;
682
683 dst0 = ip6->ip6_dst;
684 if (in6_setscope(&dst0, origifp, &zone))
685 goto badscope;
686 /* re-initialize to be sure */
687 bzero(&dst_sa, sizeof(dst_sa));
688 dst_sa.sin6_family = AF_INET6;
689 dst_sa.sin6_len = sizeof(dst_sa);
690 dst_sa.sin6_addr = ip6->ip6_dst;
691 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) {
692 goto badscope;
693 }
694
695 /* We should use ia_ifp to support the case of
696 * sending packets to an address of our own.
697 */
698 if (ia != NULL && ia->ia_ifp)
699 ifp = ia->ia_ifp;
700
701 /* scope check is done. */
702 goto routefound;
703
704 badscope:
705 IP6STAT_INC(ip6s_badscope);
706 in6_ifstat_inc(origifp, ifs6_out_discard);
707 if (error == 0)
708 error = EHOSTUNREACH; /* XXX */
709 goto bad;
710
711 routefound:
712 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
713 if (opt && opt->ip6po_nextroute.ro_rt) {
714 /*
715 * The nexthop is explicitly specified by the
716 * application. We assume the next hop is an IPv6
717 * address.
718 */
719 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
720 }
721 else if ((rt->rt_flags & RTF_GATEWAY))
722 dst = (struct sockaddr_in6 *)rt->rt_gateway;
723 }
724
725 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
726 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
727 } else {
728 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
729 in6_ifstat_inc(ifp, ifs6_out_mcast);
730 /*
731 * Confirm that the outgoing interface supports multicast.
732 */
733 if (!(ifp->if_flags & IFF_MULTICAST)) {
734 IP6STAT_INC(ip6s_noroute);
735 in6_ifstat_inc(ifp, ifs6_out_discard);
736 error = ENETUNREACH;
737 goto bad;
738 }
739 if ((im6o == NULL && in6_mcast_loop) ||
740 (im6o && im6o->im6o_multicast_loop)) {
741 /*
742 * Loop back multicast datagram if not expressly
743 * forbidden to do so, even if we have not joined
744 * the address; protocols will filter it later,
745 * thus deferring a hash lookup and lock acquisition
746 * at the expense of an m_copym().
747 */
748 ip6_mloopback(ifp, m, dst);
749 } else {
750 /*
751 * If we are acting as a multicast router, perform
752 * multicast forwarding as if the packet had just
753 * arrived on the interface to which we are about
754 * to send. The multicast forwarding function
755 * recursively calls this function, using the
756 * IPV6_FORWARDING flag to prevent infinite recursion.
757 *
758 * Multicasts that are looped back by ip6_mloopback(),
759 * above, will be forwarded by the ip6_input() routine,
760 * if necessary.
761 */
762 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
763 /*
764 * XXX: ip6_mforward expects that rcvif is NULL
765 * when it is called from the originating path.
766 * However, it may not always be the case.
767 */
768 m->m_pkthdr.rcvif = NULL;
769 if (ip6_mforward(ip6, ifp, m) != 0) {
770 m_freem(m);
771 goto done;
772 }
773 }
774 }
775 /*
776 * Multicasts with a hoplimit of zero may be looped back,
777 * above, but must not be transmitted on a network.
778 * Also, multicasts addressed to the loopback interface
779 * are not sent -- the above call to ip6_mloopback() will
780 * loop back a copy if this host actually belongs to the
781 * destination group on the loopback interface.
782 */
783 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
784 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
785 m_freem(m);
786 goto done;
787 }
788 }
789
790 /*
791 * Fill the outgoing inteface to tell the upper layer
792 * to increment per-interface statistics.
793 */
794 if (ifpp)
795 *ifpp = ifp;
796
797 /* Determine path MTU. */
798 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu,
799 &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0)
800 goto bad;
801
802 /*
803 * The caller of this function may specify to use the minimum MTU
804 * in some cases.
805 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
806 * setting. The logic is a bit complicated; by default, unicast
807 * packets will follow path MTU while multicast packets will be sent at
808 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
809 * including unicast ones will be sent at the minimum MTU. Multicast
810 * packets will always be sent at the minimum MTU unless
811 * IP6PO_MINMTU_DISABLE is explicitly specified.
812 * See RFC 3542 for more details.
813 */
814 if (mtu > IPV6_MMTU) {
815 if ((flags & IPV6_MINMTU))
816 mtu = IPV6_MMTU;
817 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
818 mtu = IPV6_MMTU;
819 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
820 (opt == NULL ||
821 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
822 mtu = IPV6_MMTU;
823 }
824 }
825
826 /*
827 * clear embedded scope identifiers if necessary.
828 * in6_clearscope will touch the addresses only when necessary.
829 */
830 in6_clearscope(&ip6->ip6_src);
831 in6_clearscope(&ip6->ip6_dst);
832
833 /*
834 * If the outgoing packet contains a hop-by-hop options header,
835 * it must be examined and processed even by the source node.
836 * (RFC 2460, section 4.)
837 */
838 if (exthdrs.ip6e_hbh) {
839 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
840 u_int32_t dummy; /* XXX unused */
841 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
842
843 #ifdef DIAGNOSTIC
844 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
845 panic("ip6e_hbh is not contiguous");
846 #endif
847 /*
848 * XXX: if we have to send an ICMPv6 error to the sender,
849 * we need the M_LOOP flag since icmp6_error() expects
850 * the IPv6 and the hop-by-hop options header are
851 * contiguous unless the flag is set.
852 */
853 m->m_flags |= M_LOOP;
854 m->m_pkthdr.rcvif = ifp;
855 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
856 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
857 &dummy, &plen) < 0) {
858 /* m was already freed at this point */
859 error = EINVAL;/* better error? */
860 goto done;
861 }
862 m->m_flags &= ~M_LOOP; /* XXX */
863 m->m_pkthdr.rcvif = NULL;
864 }
865
866 /* Jump over all PFIL processing if hooks are not active. */
867 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
868 goto passout;
869
870 odst = ip6->ip6_dst;
871 /* Run through list of hooks for output packets. */
872 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp);
873 if (error != 0 || m == NULL)
874 goto done;
875 ip6 = mtod(m, struct ip6_hdr *);
876
877 /* See if destination IP address was changed by packet filter. */
878 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
879 m->m_flags |= M_SKIP_FIREWALL;
880 /* If destination is now ourself drop to ip6_input(). */
881 if (in6_localip(&ip6->ip6_dst)) {
882 m->m_flags |= M_FASTFWD_OURS;
883 if (m->m_pkthdr.rcvif == NULL)
884 m->m_pkthdr.rcvif = V_loif;
885 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
886 m->m_pkthdr.csum_flags |=
887 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
888 m->m_pkthdr.csum_data = 0xffff;
889 }
890 #ifdef SCTP
891 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
892 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
893 #endif
894 error = netisr_queue(NETISR_IPV6, m);
895 goto done;
896 } else
897 goto again; /* Redo the routing table lookup. */
898 }
899
900 /* See if local, if yes, send it to netisr. */
901 if (m->m_flags & M_FASTFWD_OURS) {
902 if (m->m_pkthdr.rcvif == NULL)
903 m->m_pkthdr.rcvif = V_loif;
904 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
905 m->m_pkthdr.csum_flags |=
906 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
907 m->m_pkthdr.csum_data = 0xffff;
908 }
909 #ifdef SCTP
910 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
911 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
912 #endif
913 error = netisr_queue(NETISR_IPV6, m);
914 goto done;
915 }
916 /* Or forward to some other address? */
917 if ((m->m_flags & M_IP6_NEXTHOP) &&
918 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
919 dst = (struct sockaddr_in6 *)&ro->ro_dst;
920 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
921 m->m_flags |= M_SKIP_FIREWALL;
922 m->m_flags &= ~M_IP6_NEXTHOP;
923 m_tag_delete(m, fwd_tag);
924 goto again;
925 }
926
927 passout:
928 /*
929 * Send the packet to the outgoing interface.
930 * If necessary, do IPv6 fragmentation before sending.
931 *
932 * the logic here is rather complex:
933 * 1: normal case (dontfrag == 0, alwaysfrag == 0)
934 * 1-a: send as is if tlen <= path mtu
935 * 1-b: fragment if tlen > path mtu
936 *
937 * 2: if user asks us not to fragment (dontfrag == 1)
938 * 2-a: send as is if tlen <= interface mtu
939 * 2-b: error if tlen > interface mtu
940 *
941 * 3: if we always need to attach fragment header (alwaysfrag == 1)
942 * always fragment
943 *
944 * 4: if dontfrag == 1 && alwaysfrag == 1
945 * error, as we cannot handle this conflicting request
946 */
947 sw_csum = m->m_pkthdr.csum_flags;
948 if (!hdrsplit) {
949 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0;
950 sw_csum &= ~ifp->if_hwassist;
951 } else
952 tso = 0;
953 /*
954 * If we added extension headers, we will not do TSO and calculate the
955 * checksums ourselves for now.
956 * XXX-BZ Need a framework to know when the NIC can handle it, even
957 * with ext. hdrs.
958 */
959 if (sw_csum & CSUM_DELAY_DATA_IPV6) {
960 sw_csum &= ~CSUM_DELAY_DATA_IPV6;
961 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
962 }
963 #ifdef SCTP
964 if (sw_csum & CSUM_SCTP_IPV6) {
965 sw_csum &= ~CSUM_SCTP_IPV6;
966 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
967 }
968 #endif
969 m->m_pkthdr.csum_flags &= ifp->if_hwassist;
970 tlen = m->m_pkthdr.len;
971
972 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
973 dontfrag = 1;
974 else
975 dontfrag = 0;
976 if (dontfrag && alwaysfrag) { /* case 4 */
977 /* conflicting request - can't transmit */
978 error = EMSGSIZE;
979 goto bad;
980 }
981 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */
982 /*
983 * Even if the DONTFRAG option is specified, we cannot send the
984 * packet when the data length is larger than the MTU of the
985 * outgoing interface.
986 * Notify the error by sending IPV6_PATHMTU ancillary data as
987 * well as returning an error code (the latter is not described
988 * in the API spec.)
989 */
990 u_int32_t mtu32;
991 struct ip6ctlparam ip6cp;
992
993 mtu32 = (u_int32_t)mtu;
994 bzero(&ip6cp, sizeof(ip6cp));
995 ip6cp.ip6c_cmdarg = (void *)&mtu32;
996 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
997 (void *)&ip6cp);
998
999 error = EMSGSIZE;
1000 goto bad;
1001 }
1002
1003 /*
1004 * transmit packet without fragmentation
1005 */
1006 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
1007 struct in6_ifaddr *ia6;
1008
1009 ip6 = mtod(m, struct ip6_hdr *);
1010 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
1011 if (ia6) {
1012 /* Record statistics for this interface address. */
1013 ia6->ia_ifa.if_opackets++;
1014 ia6->ia_ifa.if_obytes += m->m_pkthdr.len;
1015 ifa_free(&ia6->ia_ifa);
1016 }
1017 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
1018 goto done;
1019 }
1020
1021 /*
1022 * try to fragment the packet. case 1-b and 3
1023 */
1024 if (mtu < IPV6_MMTU) {
1025 /* path MTU cannot be less than IPV6_MMTU */
1026 error = EMSGSIZE;
1027 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1028 goto bad;
1029 } else if (ip6->ip6_plen == 0) {
1030 /* jumbo payload cannot be fragmented */
1031 error = EMSGSIZE;
1032 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1033 goto bad;
1034 } else {
1035 struct mbuf **mnext, *m_frgpart;
1036 struct ip6_frag *ip6f;
1037 u_int32_t id = htonl(ip6_randomid());
1038 u_char nextproto;
1039
1040 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len;
1041
1042 /*
1043 * Too large for the destination or interface;
1044 * fragment if possible.
1045 * Must be able to put at least 8 bytes per fragment.
1046 */
1047 hlen = unfragpartlen;
1048 if (mtu > IPV6_MAXPACKET)
1049 mtu = IPV6_MAXPACKET;
1050
1051 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
1052 if (len < 8) {
1053 error = EMSGSIZE;
1054 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1055 goto bad;
1056 }
1057
1058 /*
1059 * Verify that we have any chance at all of being able to queue
1060 * the packet or packet fragments
1061 */
1062 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen)
1063 < tlen /* - hlen */)) {
1064 error = ENOBUFS;
1065 IP6STAT_INC(ip6s_odropped);
1066 goto bad;
1067 }
1068
1069
1070 /*
1071 * If the interface will not calculate checksums on
1072 * fragmented packets, then do it here.
1073 * XXX-BZ handle the hw offloading case. Need flags.
1074 */
1075 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1076 in6_delayed_cksum(m, plen, hlen);
1077 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
1078 }
1079 #ifdef SCTP
1080 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
1081 sctp_delayed_cksum(m, hlen);
1082 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
1083 }
1084 #endif
1085 mnext = &m->m_nextpkt;
1086
1087 /*
1088 * Change the next header field of the last header in the
1089 * unfragmentable part.
1090 */
1091 if (exthdrs.ip6e_rthdr) {
1092 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
1093 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
1094 } else if (exthdrs.ip6e_dest1) {
1095 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
1096 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
1097 } else if (exthdrs.ip6e_hbh) {
1098 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
1099 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
1100 } else {
1101 nextproto = ip6->ip6_nxt;
1102 ip6->ip6_nxt = IPPROTO_FRAGMENT;
1103 }
1104
1105 /*
1106 * Loop through length of segment after first fragment,
1107 * make new header and copy data of each part and link onto
1108 * chain.
1109 */
1110 m0 = m;
1111 for (off = hlen; off < tlen; off += len) {
1112 m = m_gethdr(M_NOWAIT, MT_DATA);
1113 if (!m) {
1114 error = ENOBUFS;
1115 IP6STAT_INC(ip6s_odropped);
1116 goto sendorfree;
1117 }
1118 m->m_flags = m0->m_flags & M_COPYFLAGS;
1119 *mnext = m;
1120 mnext = &m->m_nextpkt;
1121 m->m_data += max_linkhdr;
1122 mhip6 = mtod(m, struct ip6_hdr *);
1123 *mhip6 = *ip6;
1124 m->m_len = sizeof(*mhip6);
1125 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
1126 if (error) {
1127 IP6STAT_INC(ip6s_odropped);
1128 goto sendorfree;
1129 }
1130 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
1131 if (off + len >= tlen)
1132 len = tlen - off;
1133 else
1134 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
1135 mhip6->ip6_plen = htons((u_short)(len + hlen +
1136 sizeof(*ip6f) - sizeof(struct ip6_hdr)));
1137 if ((m_frgpart = m_copy(m0, off, len)) == 0) {
1138 error = ENOBUFS;
1139 IP6STAT_INC(ip6s_odropped);
1140 goto sendorfree;
1141 }
1142 m_cat(m, m_frgpart);
1143 m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
1144 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum;
1145 m->m_pkthdr.rcvif = NULL;
1146 ip6f->ip6f_reserved = 0;
1147 ip6f->ip6f_ident = id;
1148 ip6f->ip6f_nxt = nextproto;
1149 IP6STAT_INC(ip6s_ofragments);
1150 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
1151 }
1152
1153 in6_ifstat_inc(ifp, ifs6_out_fragok);
1154 }
1155
1156 /*
1157 * Remove leading garbages.
1158 */
1159 sendorfree:
1160 m = m0->m_nextpkt;
1161 m0->m_nextpkt = 0;
1162 m_freem(m0);
1163 for (m0 = m; m; m = m0) {
1164 m0 = m->m_nextpkt;
1165 m->m_nextpkt = 0;
1166 if (error == 0) {
1167 /* Record statistics for this interface address. */
1168 if (ia) {
1169 ia->ia_ifa.if_opackets++;
1170 ia->ia_ifa.if_obytes += m->m_pkthdr.len;
1171 }
1172 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
1173 } else
1174 m_freem(m);
1175 }
1176
1177 if (error == 0)
1178 IP6STAT_INC(ip6s_fragmented);
1179
1180 done:
1181 if (ro == &ip6route)
1182 RO_RTFREE(ro);
1183 if (ro_pmtu == &ip6route)
1184 RO_RTFREE(ro_pmtu);
1185 #ifdef IPSEC
1186 if (sp != NULL)
1187 KEY_FREESP(&sp);
1188 #endif
1189
1190 return (error);
1191
1192 freehdrs:
1193 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */
1194 m_freem(exthdrs.ip6e_dest1);
1195 m_freem(exthdrs.ip6e_rthdr);
1196 m_freem(exthdrs.ip6e_dest2);
1197 /* FALLTHROUGH */
1198 bad:
1199 if (m)
1200 m_freem(m);
1201 goto done;
1202 }
1203
1204 static int
1205 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1206 {
1207 struct mbuf *m;
1208
1209 if (hlen > MCLBYTES)
1210 return (ENOBUFS); /* XXX */
1211
1212 if (hlen > MLEN)
1213 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1214 else
1215 m = m_get(M_NOWAIT, MT_DATA);
1216 if (m == NULL)
1217 return (ENOBUFS);
1218 m->m_len = hlen;
1219 if (hdr)
1220 bcopy(hdr, mtod(m, caddr_t), hlen);
1221
1222 *mp = m;
1223 return (0);
1224 }
1225
1226 /*
1227 * Insert jumbo payload option.
1228 */
1229 static int
1230 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1231 {
1232 struct mbuf *mopt;
1233 u_char *optbuf;
1234 u_int32_t v;
1235
1236 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */
1237
1238 /*
1239 * If there is no hop-by-hop options header, allocate new one.
1240 * If there is one but it doesn't have enough space to store the
1241 * jumbo payload option, allocate a cluster to store the whole options.
1242 * Otherwise, use it to store the options.
1243 */
1244 if (exthdrs->ip6e_hbh == 0) {
1245 mopt = m_get(M_NOWAIT, MT_DATA);
1246 if (mopt == NULL)
1247 return (ENOBUFS);
1248 mopt->m_len = JUMBOOPTLEN;
1249 optbuf = mtod(mopt, u_char *);
1250 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */
1251 exthdrs->ip6e_hbh = mopt;
1252 } else {
1253 struct ip6_hbh *hbh;
1254
1255 mopt = exthdrs->ip6e_hbh;
1256 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1257 /*
1258 * XXX assumption:
1259 * - exthdrs->ip6e_hbh is not referenced from places
1260 * other than exthdrs.
1261 * - exthdrs->ip6e_hbh is not an mbuf chain.
1262 */
1263 int oldoptlen = mopt->m_len;
1264 struct mbuf *n;
1265
1266 /*
1267 * XXX: give up if the whole (new) hbh header does
1268 * not fit even in an mbuf cluster.
1269 */
1270 if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1271 return (ENOBUFS);
1272
1273 /*
1274 * As a consequence, we must always prepare a cluster
1275 * at this point.
1276 */
1277 n = m_getcl(M_NOWAIT, MT_DATA, 0);
1278 if (n == NULL)
1279 return (ENOBUFS);
1280 n->m_len = oldoptlen + JUMBOOPTLEN;
1281 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
1282 oldoptlen);
1283 optbuf = mtod(n, caddr_t) + oldoptlen;
1284 m_freem(mopt);
1285 mopt = exthdrs->ip6e_hbh = n;
1286 } else {
1287 optbuf = mtod(mopt, u_char *) + mopt->m_len;
1288 mopt->m_len += JUMBOOPTLEN;
1289 }
1290 optbuf[0] = IP6OPT_PADN;
1291 optbuf[1] = 1;
1292
1293 /*
1294 * Adjust the header length according to the pad and
1295 * the jumbo payload option.
1296 */
1297 hbh = mtod(mopt, struct ip6_hbh *);
1298 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1299 }
1300
1301 /* fill in the option. */
1302 optbuf[2] = IP6OPT_JUMBO;
1303 optbuf[3] = 4;
1304 v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1305 bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1306
1307 /* finally, adjust the packet header length */
1308 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1309
1310 return (0);
1311 #undef JUMBOOPTLEN
1312 }
1313
1314 /*
1315 * Insert fragment header and copy unfragmentable header portions.
1316 */
1317 static int
1318 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1319 struct ip6_frag **frghdrp)
1320 {
1321 struct mbuf *n, *mlast;
1322
1323 if (hlen > sizeof(struct ip6_hdr)) {
1324 n = m_copym(m0, sizeof(struct ip6_hdr),
1325 hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1326 if (n == 0)
1327 return (ENOBUFS);
1328 m->m_next = n;
1329 } else
1330 n = m;
1331
1332 /* Search for the last mbuf of unfragmentable part. */
1333 for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1334 ;
1335
1336 if ((mlast->m_flags & M_EXT) == 0 &&
1337 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1338 /* use the trailing space of the last mbuf for the fragment hdr */
1339 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1340 mlast->m_len);
1341 mlast->m_len += sizeof(struct ip6_frag);
1342 m->m_pkthdr.len += sizeof(struct ip6_frag);
1343 } else {
1344 /* allocate a new mbuf for the fragment header */
1345 struct mbuf *mfrg;
1346
1347 mfrg = m_get(M_NOWAIT, MT_DATA);
1348 if (mfrg == NULL)
1349 return (ENOBUFS);
1350 mfrg->m_len = sizeof(struct ip6_frag);
1351 *frghdrp = mtod(mfrg, struct ip6_frag *);
1352 mlast->m_next = mfrg;
1353 }
1354
1355 return (0);
1356 }
1357
1358 static int
1359 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro,
1360 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup,
1361 int *alwaysfragp, u_int fibnum)
1362 {
1363 u_int32_t mtu = 0;
1364 int alwaysfrag = 0;
1365 int error = 0;
1366
1367 if (ro_pmtu != ro) {
1368 /* The first hop and the final destination may differ. */
1369 struct sockaddr_in6 *sa6_dst =
1370 (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1371 if (ro_pmtu->ro_rt &&
1372 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 ||
1373 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) {
1374 RTFREE(ro_pmtu->ro_rt);
1375 ro_pmtu->ro_rt = (struct rtentry *)NULL;
1376 }
1377 if (ro_pmtu->ro_rt == NULL) {
1378 bzero(sa6_dst, sizeof(*sa6_dst));
1379 sa6_dst->sin6_family = AF_INET6;
1380 sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1381 sa6_dst->sin6_addr = *dst;
1382
1383 in6_rtalloc(ro_pmtu, fibnum);
1384 }
1385 }
1386 if (ro_pmtu->ro_rt) {
1387 u_int32_t ifmtu;
1388 struct in_conninfo inc;
1389
1390 bzero(&inc, sizeof(inc));
1391 inc.inc_flags |= INC_ISIPV6;
1392 inc.inc6_faddr = *dst;
1393
1394 if (ifp == NULL)
1395 ifp = ro_pmtu->ro_rt->rt_ifp;
1396 ifmtu = IN6_LINKMTU(ifp);
1397 mtu = tcp_hc_getmtu(&inc);
1398 if (mtu)
1399 mtu = min(mtu, ro_pmtu->ro_rt->rt_mtu);
1400 else
1401 mtu = ro_pmtu->ro_rt->rt_mtu;
1402 if (mtu == 0)
1403 mtu = ifmtu;
1404 else if (mtu < IPV6_MMTU) {
1405 /*
1406 * RFC2460 section 5, last paragraph:
1407 * if we record ICMPv6 too big message with
1408 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1409 * or smaller, with framgent header attached.
1410 * (fragment header is needed regardless from the
1411 * packet size, for translators to identify packets)
1412 */
1413 alwaysfrag = 1;
1414 mtu = IPV6_MMTU;
1415 } else if (mtu > ifmtu) {
1416 /*
1417 * The MTU on the route is larger than the MTU on
1418 * the interface! This shouldn't happen, unless the
1419 * MTU of the interface has been changed after the
1420 * interface was brought up. Change the MTU in the
1421 * route to match the interface MTU (as long as the
1422 * field isn't locked).
1423 */
1424 mtu = ifmtu;
1425 ro_pmtu->ro_rt->rt_mtu = mtu;
1426 }
1427 } else if (ifp) {
1428 mtu = IN6_LINKMTU(ifp);
1429 } else
1430 error = EHOSTUNREACH; /* XXX */
1431
1432 *mtup = mtu;
1433 if (alwaysfragp)
1434 *alwaysfragp = alwaysfrag;
1435 return (error);
1436 }
1437
1438 /*
1439 * IP6 socket option processing.
1440 */
1441 int
1442 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1443 {
1444 int optdatalen, uproto;
1445 void *optdata;
1446 struct inpcb *in6p = sotoinpcb(so);
1447 int error, optval;
1448 int level, op, optname;
1449 int optlen;
1450 struct thread *td;
1451
1452 level = sopt->sopt_level;
1453 op = sopt->sopt_dir;
1454 optname = sopt->sopt_name;
1455 optlen = sopt->sopt_valsize;
1456 td = sopt->sopt_td;
1457 error = 0;
1458 optval = 0;
1459 uproto = (int)so->so_proto->pr_protocol;
1460
1461 if (level != IPPROTO_IPV6) {
1462 error = EINVAL;
1463
1464 if (sopt->sopt_level == SOL_SOCKET &&
1465 sopt->sopt_dir == SOPT_SET) {
1466 switch (sopt->sopt_name) {
1467 case SO_REUSEADDR:
1468 INP_WLOCK(in6p);
1469 if ((so->so_options & SO_REUSEADDR) != 0)
1470 in6p->inp_flags2 |= INP_REUSEADDR;
1471 else
1472 in6p->inp_flags2 &= ~INP_REUSEADDR;
1473 INP_WUNLOCK(in6p);
1474 error = 0;
1475 break;
1476 case SO_REUSEPORT:
1477 INP_WLOCK(in6p);
1478 if ((so->so_options & SO_REUSEPORT) != 0)
1479 in6p->inp_flags2 |= INP_REUSEPORT;
1480 else
1481 in6p->inp_flags2 &= ~INP_REUSEPORT;
1482 INP_WUNLOCK(in6p);
1483 error = 0;
1484 break;
1485 case SO_SETFIB:
1486 INP_WLOCK(in6p);
1487 in6p->inp_inc.inc_fibnum = so->so_fibnum;
1488 INP_WUNLOCK(in6p);
1489 error = 0;
1490 break;
1491 default:
1492 break;
1493 }
1494 }
1495 } else { /* level == IPPROTO_IPV6 */
1496 switch (op) {
1497
1498 case SOPT_SET:
1499 switch (optname) {
1500 case IPV6_2292PKTOPTIONS:
1501 #ifdef IPV6_PKTOPTIONS
1502 case IPV6_PKTOPTIONS:
1503 #endif
1504 {
1505 struct mbuf *m;
1506
1507 error = soopt_getm(sopt, &m); /* XXX */
1508 if (error != 0)
1509 break;
1510 error = soopt_mcopyin(sopt, m); /* XXX */
1511 if (error != 0)
1512 break;
1513 error = ip6_pcbopts(&in6p->in6p_outputopts,
1514 m, so, sopt);
1515 m_freem(m); /* XXX */
1516 break;
1517 }
1518
1519 /*
1520 * Use of some Hop-by-Hop options or some
1521 * Destination options, might require special
1522 * privilege. That is, normal applications
1523 * (without special privilege) might be forbidden
1524 * from setting certain options in outgoing packets,
1525 * and might never see certain options in received
1526 * packets. [RFC 2292 Section 6]
1527 * KAME specific note:
1528 * KAME prevents non-privileged users from sending or
1529 * receiving ANY hbh/dst options in order to avoid
1530 * overhead of parsing options in the kernel.
1531 */
1532 case IPV6_RECVHOPOPTS:
1533 case IPV6_RECVDSTOPTS:
1534 case IPV6_RECVRTHDRDSTOPTS:
1535 if (td != NULL) {
1536 error = priv_check(td,
1537 PRIV_NETINET_SETHDROPTS);
1538 if (error)
1539 break;
1540 }
1541 /* FALLTHROUGH */
1542 case IPV6_UNICAST_HOPS:
1543 case IPV6_HOPLIMIT:
1544 case IPV6_FAITH:
1545
1546 case IPV6_RECVPKTINFO:
1547 case IPV6_RECVHOPLIMIT:
1548 case IPV6_RECVRTHDR:
1549 case IPV6_RECVPATHMTU:
1550 case IPV6_RECVTCLASS:
1551 case IPV6_V6ONLY:
1552 case IPV6_AUTOFLOWLABEL:
1553 case IPV6_BINDANY:
1554 if (optname == IPV6_BINDANY && td != NULL) {
1555 error = priv_check(td,
1556 PRIV_NETINET_BINDANY);
1557 if (error)
1558 break;
1559 }
1560
1561 if (optlen != sizeof(int)) {
1562 error = EINVAL;
1563 break;
1564 }
1565 error = sooptcopyin(sopt, &optval,
1566 sizeof optval, sizeof optval);
1567 if (error)
1568 break;
1569 switch (optname) {
1570
1571 case IPV6_UNICAST_HOPS:
1572 if (optval < -1 || optval >= 256)
1573 error = EINVAL;
1574 else {
1575 /* -1 = kernel default */
1576 in6p->in6p_hops = optval;
1577 if ((in6p->inp_vflag &
1578 INP_IPV4) != 0)
1579 in6p->inp_ip_ttl = optval;
1580 }
1581 break;
1582 #define OPTSET(bit) \
1583 do { \
1584 INP_WLOCK(in6p); \
1585 if (optval) \
1586 in6p->inp_flags |= (bit); \
1587 else \
1588 in6p->inp_flags &= ~(bit); \
1589 INP_WUNLOCK(in6p); \
1590 } while (/*CONSTCOND*/ 0)
1591 #define OPTSET2292(bit) \
1592 do { \
1593 INP_WLOCK(in6p); \
1594 in6p->inp_flags |= IN6P_RFC2292; \
1595 if (optval) \
1596 in6p->inp_flags |= (bit); \
1597 else \
1598 in6p->inp_flags &= ~(bit); \
1599 INP_WUNLOCK(in6p); \
1600 } while (/*CONSTCOND*/ 0)
1601 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0)
1602
1603 case IPV6_RECVPKTINFO:
1604 /* cannot mix with RFC2292 */
1605 if (OPTBIT(IN6P_RFC2292)) {
1606 error = EINVAL;
1607 break;
1608 }
1609 OPTSET(IN6P_PKTINFO);
1610 break;
1611
1612 case IPV6_HOPLIMIT:
1613 {
1614 struct ip6_pktopts **optp;
1615
1616 /* cannot mix with RFC2292 */
1617 if (OPTBIT(IN6P_RFC2292)) {
1618 error = EINVAL;
1619 break;
1620 }
1621 optp = &in6p->in6p_outputopts;
1622 error = ip6_pcbopt(IPV6_HOPLIMIT,
1623 (u_char *)&optval, sizeof(optval),
1624 optp, (td != NULL) ? td->td_ucred :
1625 NULL, uproto);
1626 break;
1627 }
1628
1629 case IPV6_RECVHOPLIMIT:
1630 /* cannot mix with RFC2292 */
1631 if (OPTBIT(IN6P_RFC2292)) {
1632 error = EINVAL;
1633 break;
1634 }
1635 OPTSET(IN6P_HOPLIMIT);
1636 break;
1637
1638 case IPV6_RECVHOPOPTS:
1639 /* cannot mix with RFC2292 */
1640 if (OPTBIT(IN6P_RFC2292)) {
1641 error = EINVAL;
1642 break;
1643 }
1644 OPTSET(IN6P_HOPOPTS);
1645 break;
1646
1647 case IPV6_RECVDSTOPTS:
1648 /* cannot mix with RFC2292 */
1649 if (OPTBIT(IN6P_RFC2292)) {
1650 error = EINVAL;
1651 break;
1652 }
1653 OPTSET(IN6P_DSTOPTS);
1654 break;
1655
1656 case IPV6_RECVRTHDRDSTOPTS:
1657 /* cannot mix with RFC2292 */
1658 if (OPTBIT(IN6P_RFC2292)) {
1659 error = EINVAL;
1660 break;
1661 }
1662 OPTSET(IN6P_RTHDRDSTOPTS);
1663 break;
1664
1665 case IPV6_RECVRTHDR:
1666 /* cannot mix with RFC2292 */
1667 if (OPTBIT(IN6P_RFC2292)) {
1668 error = EINVAL;
1669 break;
1670 }
1671 OPTSET(IN6P_RTHDR);
1672 break;
1673
1674 case IPV6_FAITH:
1675 OPTSET(INP_FAITH);
1676 break;
1677
1678 case IPV6_RECVPATHMTU:
1679 /*
1680 * We ignore this option for TCP
1681 * sockets.
1682 * (RFC3542 leaves this case
1683 * unspecified.)
1684 */
1685 if (uproto != IPPROTO_TCP)
1686 OPTSET(IN6P_MTU);
1687 break;
1688
1689 case IPV6_V6ONLY:
1690 /*
1691 * make setsockopt(IPV6_V6ONLY)
1692 * available only prior to bind(2).
1693 * see ipng mailing list, Jun 22 2001.
1694 */
1695 if (in6p->inp_lport ||
1696 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1697 error = EINVAL;
1698 break;
1699 }
1700 OPTSET(IN6P_IPV6_V6ONLY);
1701 if (optval)
1702 in6p->inp_vflag &= ~INP_IPV4;
1703 else
1704 in6p->inp_vflag |= INP_IPV4;
1705 break;
1706 case IPV6_RECVTCLASS:
1707 /* cannot mix with RFC2292 XXX */
1708 if (OPTBIT(IN6P_RFC2292)) {
1709 error = EINVAL;
1710 break;
1711 }
1712 OPTSET(IN6P_TCLASS);
1713 break;
1714 case IPV6_AUTOFLOWLABEL:
1715 OPTSET(IN6P_AUTOFLOWLABEL);
1716 break;
1717
1718 case IPV6_BINDANY:
1719 OPTSET(INP_BINDANY);
1720 break;
1721 }
1722 break;
1723
1724 case IPV6_TCLASS:
1725 case IPV6_DONTFRAG:
1726 case IPV6_USE_MIN_MTU:
1727 case IPV6_PREFER_TEMPADDR:
1728 if (optlen != sizeof(optval)) {
1729 error = EINVAL;
1730 break;
1731 }
1732 error = sooptcopyin(sopt, &optval,
1733 sizeof optval, sizeof optval);
1734 if (error)
1735 break;
1736 {
1737 struct ip6_pktopts **optp;
1738 optp = &in6p->in6p_outputopts;
1739 error = ip6_pcbopt(optname,
1740 (u_char *)&optval, sizeof(optval),
1741 optp, (td != NULL) ? td->td_ucred :
1742 NULL, uproto);
1743 break;
1744 }
1745
1746 case IPV6_2292PKTINFO:
1747 case IPV6_2292HOPLIMIT:
1748 case IPV6_2292HOPOPTS:
1749 case IPV6_2292DSTOPTS:
1750 case IPV6_2292RTHDR:
1751 /* RFC 2292 */
1752 if (optlen != sizeof(int)) {
1753 error = EINVAL;
1754 break;
1755 }
1756 error = sooptcopyin(sopt, &optval,
1757 sizeof optval, sizeof optval);
1758 if (error)
1759 break;
1760 switch (optname) {
1761 case IPV6_2292PKTINFO:
1762 OPTSET2292(IN6P_PKTINFO);
1763 break;
1764 case IPV6_2292HOPLIMIT:
1765 OPTSET2292(IN6P_HOPLIMIT);
1766 break;
1767 case IPV6_2292HOPOPTS:
1768 /*
1769 * Check super-user privilege.
1770 * See comments for IPV6_RECVHOPOPTS.
1771 */
1772 if (td != NULL) {
1773 error = priv_check(td,
1774 PRIV_NETINET_SETHDROPTS);
1775 if (error)
1776 return (error);
1777 }
1778 OPTSET2292(IN6P_HOPOPTS);
1779 break;
1780 case IPV6_2292DSTOPTS:
1781 if (td != NULL) {
1782 error = priv_check(td,
1783 PRIV_NETINET_SETHDROPTS);
1784 if (error)
1785 return (error);
1786 }
1787 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1788 break;
1789 case IPV6_2292RTHDR:
1790 OPTSET2292(IN6P_RTHDR);
1791 break;
1792 }
1793 break;
1794 case IPV6_PKTINFO:
1795 case IPV6_HOPOPTS:
1796 case IPV6_RTHDR:
1797 case IPV6_DSTOPTS:
1798 case IPV6_RTHDRDSTOPTS:
1799 case IPV6_NEXTHOP:
1800 {
1801 /* new advanced API (RFC3542) */
1802 u_char *optbuf;
1803 u_char optbuf_storage[MCLBYTES];
1804 int optlen;
1805 struct ip6_pktopts **optp;
1806
1807 /* cannot mix with RFC2292 */
1808 if (OPTBIT(IN6P_RFC2292)) {
1809 error = EINVAL;
1810 break;
1811 }
1812
1813 /*
1814 * We only ensure valsize is not too large
1815 * here. Further validation will be done
1816 * later.
1817 */
1818 error = sooptcopyin(sopt, optbuf_storage,
1819 sizeof(optbuf_storage), 0);
1820 if (error)
1821 break;
1822 optlen = sopt->sopt_valsize;
1823 optbuf = optbuf_storage;
1824 optp = &in6p->in6p_outputopts;
1825 error = ip6_pcbopt(optname, optbuf, optlen,
1826 optp, (td != NULL) ? td->td_ucred : NULL,
1827 uproto);
1828 break;
1829 }
1830 #undef OPTSET
1831
1832 case IPV6_MULTICAST_IF:
1833 case IPV6_MULTICAST_HOPS:
1834 case IPV6_MULTICAST_LOOP:
1835 case IPV6_JOIN_GROUP:
1836 case IPV6_LEAVE_GROUP:
1837 case IPV6_MSFILTER:
1838 case MCAST_BLOCK_SOURCE:
1839 case MCAST_UNBLOCK_SOURCE:
1840 case MCAST_JOIN_GROUP:
1841 case MCAST_LEAVE_GROUP:
1842 case MCAST_JOIN_SOURCE_GROUP:
1843 case MCAST_LEAVE_SOURCE_GROUP:
1844 error = ip6_setmoptions(in6p, sopt);
1845 break;
1846
1847 case IPV6_PORTRANGE:
1848 error = sooptcopyin(sopt, &optval,
1849 sizeof optval, sizeof optval);
1850 if (error)
1851 break;
1852
1853 INP_WLOCK(in6p);
1854 switch (optval) {
1855 case IPV6_PORTRANGE_DEFAULT:
1856 in6p->inp_flags &= ~(INP_LOWPORT);
1857 in6p->inp_flags &= ~(INP_HIGHPORT);
1858 break;
1859
1860 case IPV6_PORTRANGE_HIGH:
1861 in6p->inp_flags &= ~(INP_LOWPORT);
1862 in6p->inp_flags |= INP_HIGHPORT;
1863 break;
1864
1865 case IPV6_PORTRANGE_LOW:
1866 in6p->inp_flags &= ~(INP_HIGHPORT);
1867 in6p->inp_flags |= INP_LOWPORT;
1868 break;
1869
1870 default:
1871 error = EINVAL;
1872 break;
1873 }
1874 INP_WUNLOCK(in6p);
1875 break;
1876
1877 #ifdef IPSEC
1878 case IPV6_IPSEC_POLICY:
1879 {
1880 caddr_t req;
1881 struct mbuf *m;
1882
1883 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1884 break;
1885 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
1886 break;
1887 req = mtod(m, caddr_t);
1888 error = ipsec_set_policy(in6p, optname, req,
1889 m->m_len, (sopt->sopt_td != NULL) ?
1890 sopt->sopt_td->td_ucred : NULL);
1891 m_freem(m);
1892 break;
1893 }
1894 #endif /* IPSEC */
1895
1896 default:
1897 error = ENOPROTOOPT;
1898 break;
1899 }
1900 break;
1901
1902 case SOPT_GET:
1903 switch (optname) {
1904
1905 case IPV6_2292PKTOPTIONS:
1906 #ifdef IPV6_PKTOPTIONS
1907 case IPV6_PKTOPTIONS:
1908 #endif
1909 /*
1910 * RFC3542 (effectively) deprecated the
1911 * semantics of the 2292-style pktoptions.
1912 * Since it was not reliable in nature (i.e.,
1913 * applications had to expect the lack of some
1914 * information after all), it would make sense
1915 * to simplify this part by always returning
1916 * empty data.
1917 */
1918 sopt->sopt_valsize = 0;
1919 break;
1920
1921 case IPV6_RECVHOPOPTS:
1922 case IPV6_RECVDSTOPTS:
1923 case IPV6_RECVRTHDRDSTOPTS:
1924 case IPV6_UNICAST_HOPS:
1925 case IPV6_RECVPKTINFO:
1926 case IPV6_RECVHOPLIMIT:
1927 case IPV6_RECVRTHDR:
1928 case IPV6_RECVPATHMTU:
1929
1930 case IPV6_FAITH:
1931 case IPV6_V6ONLY:
1932 case IPV6_PORTRANGE:
1933 case IPV6_RECVTCLASS:
1934 case IPV6_AUTOFLOWLABEL:
1935 case IPV6_BINDANY:
1936 switch (optname) {
1937
1938 case IPV6_RECVHOPOPTS:
1939 optval = OPTBIT(IN6P_HOPOPTS);
1940 break;
1941
1942 case IPV6_RECVDSTOPTS:
1943 optval = OPTBIT(IN6P_DSTOPTS);
1944 break;
1945
1946 case IPV6_RECVRTHDRDSTOPTS:
1947 optval = OPTBIT(IN6P_RTHDRDSTOPTS);
1948 break;
1949
1950 case IPV6_UNICAST_HOPS:
1951 optval = in6p->in6p_hops;
1952 break;
1953
1954 case IPV6_RECVPKTINFO:
1955 optval = OPTBIT(IN6P_PKTINFO);
1956 break;
1957
1958 case IPV6_RECVHOPLIMIT:
1959 optval = OPTBIT(IN6P_HOPLIMIT);
1960 break;
1961
1962 case IPV6_RECVRTHDR:
1963 optval = OPTBIT(IN6P_RTHDR);
1964 break;
1965
1966 case IPV6_RECVPATHMTU:
1967 optval = OPTBIT(IN6P_MTU);
1968 break;
1969
1970 case IPV6_FAITH:
1971 optval = OPTBIT(INP_FAITH);
1972 break;
1973
1974 case IPV6_V6ONLY:
1975 optval = OPTBIT(IN6P_IPV6_V6ONLY);
1976 break;
1977
1978 case IPV6_PORTRANGE:
1979 {
1980 int flags;
1981 flags = in6p->inp_flags;
1982 if (flags & INP_HIGHPORT)
1983 optval = IPV6_PORTRANGE_HIGH;
1984 else if (flags & INP_LOWPORT)
1985 optval = IPV6_PORTRANGE_LOW;
1986 else
1987 optval = 0;
1988 break;
1989 }
1990 case IPV6_RECVTCLASS:
1991 optval = OPTBIT(IN6P_TCLASS);
1992 break;
1993
1994 case IPV6_AUTOFLOWLABEL:
1995 optval = OPTBIT(IN6P_AUTOFLOWLABEL);
1996 break;
1997
1998 case IPV6_BINDANY:
1999 optval = OPTBIT(INP_BINDANY);
2000 break;
2001 }
2002 if (error)
2003 break;
2004 error = sooptcopyout(sopt, &optval,
2005 sizeof optval);
2006 break;
2007
2008 case IPV6_PATHMTU:
2009 {
2010 u_long pmtu = 0;
2011 struct ip6_mtuinfo mtuinfo;
2012 struct route_in6 sro;
2013
2014 bzero(&sro, sizeof(sro));
2015
2016 if (!(so->so_state & SS_ISCONNECTED))
2017 return (ENOTCONN);
2018 /*
2019 * XXX: we dot not consider the case of source
2020 * routing, or optional information to specify
2021 * the outgoing interface.
2022 */
2023 error = ip6_getpmtu(&sro, NULL, NULL,
2024 &in6p->in6p_faddr, &pmtu, NULL,
2025 so->so_fibnum);
2026 if (sro.ro_rt)
2027 RTFREE(sro.ro_rt);
2028 if (error)
2029 break;
2030 if (pmtu > IPV6_MAXPACKET)
2031 pmtu = IPV6_MAXPACKET;
2032
2033 bzero(&mtuinfo, sizeof(mtuinfo));
2034 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
2035 optdata = (void *)&mtuinfo;
2036 optdatalen = sizeof(mtuinfo);
2037 error = sooptcopyout(sopt, optdata,
2038 optdatalen);
2039 break;
2040 }
2041
2042 case IPV6_2292PKTINFO:
2043 case IPV6_2292HOPLIMIT:
2044 case IPV6_2292HOPOPTS:
2045 case IPV6_2292RTHDR:
2046 case IPV6_2292DSTOPTS:
2047 switch (optname) {
2048 case IPV6_2292PKTINFO:
2049 optval = OPTBIT(IN6P_PKTINFO);
2050 break;
2051 case IPV6_2292HOPLIMIT:
2052 optval = OPTBIT(IN6P_HOPLIMIT);
2053 break;
2054 case IPV6_2292HOPOPTS:
2055 optval = OPTBIT(IN6P_HOPOPTS);
2056 break;
2057 case IPV6_2292RTHDR:
2058 optval = OPTBIT(IN6P_RTHDR);
2059 break;
2060 case IPV6_2292DSTOPTS:
2061 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
2062 break;
2063 }
2064 error = sooptcopyout(sopt, &optval,
2065 sizeof optval);
2066 break;
2067 case IPV6_PKTINFO:
2068 case IPV6_HOPOPTS:
2069 case IPV6_RTHDR:
2070 case IPV6_DSTOPTS:
2071 case IPV6_RTHDRDSTOPTS:
2072 case IPV6_NEXTHOP:
2073 case IPV6_TCLASS:
2074 case IPV6_DONTFRAG:
2075 case IPV6_USE_MIN_MTU:
2076 case IPV6_PREFER_TEMPADDR:
2077 error = ip6_getpcbopt(in6p->in6p_outputopts,
2078 optname, sopt);
2079 break;
2080
2081 case IPV6_MULTICAST_IF:
2082 case IPV6_MULTICAST_HOPS:
2083 case IPV6_MULTICAST_LOOP:
2084 case IPV6_MSFILTER:
2085 error = ip6_getmoptions(in6p, sopt);
2086 break;
2087
2088 #ifdef IPSEC
2089 case IPV6_IPSEC_POLICY:
2090 {
2091 caddr_t req = NULL;
2092 size_t len = 0;
2093 struct mbuf *m = NULL;
2094 struct mbuf **mp = &m;
2095 size_t ovalsize = sopt->sopt_valsize;
2096 caddr_t oval = (caddr_t)sopt->sopt_val;
2097
2098 error = soopt_getm(sopt, &m); /* XXX */
2099 if (error != 0)
2100 break;
2101 error = soopt_mcopyin(sopt, m); /* XXX */
2102 if (error != 0)
2103 break;
2104 sopt->sopt_valsize = ovalsize;
2105 sopt->sopt_val = oval;
2106 if (m) {
2107 req = mtod(m, caddr_t);
2108 len = m->m_len;
2109 }
2110 error = ipsec_get_policy(in6p, req, len, mp);
2111 if (error == 0)
2112 error = soopt_mcopyout(sopt, m); /* XXX */
2113 if (error == 0 && m)
2114 m_freem(m);
2115 break;
2116 }
2117 #endif /* IPSEC */
2118
2119 default:
2120 error = ENOPROTOOPT;
2121 break;
2122 }
2123 break;
2124 }
2125 }
2126 return (error);
2127 }
2128
2129 int
2130 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2131 {
2132 int error = 0, optval, optlen;
2133 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2134 struct inpcb *in6p = sotoinpcb(so);
2135 int level, op, optname;
2136
2137 level = sopt->sopt_level;
2138 op = sopt->sopt_dir;
2139 optname = sopt->sopt_name;
2140 optlen = sopt->sopt_valsize;
2141
2142 if (level != IPPROTO_IPV6) {
2143 return (EINVAL);
2144 }
2145
2146 switch (optname) {
2147 case IPV6_CHECKSUM:
2148 /*
2149 * For ICMPv6 sockets, no modification allowed for checksum
2150 * offset, permit "no change" values to help existing apps.
2151 *
2152 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2153 * for an ICMPv6 socket will fail."
2154 * The current behavior does not meet RFC3542.
2155 */
2156 switch (op) {
2157 case SOPT_SET:
2158 if (optlen != sizeof(int)) {
2159 error = EINVAL;
2160 break;
2161 }
2162 error = sooptcopyin(sopt, &optval, sizeof(optval),
2163 sizeof(optval));
2164 if (error)
2165 break;
2166 if ((optval % 2) != 0) {
2167 /* the API assumes even offset values */
2168 error = EINVAL;
2169 } else if (so->so_proto->pr_protocol ==
2170 IPPROTO_ICMPV6) {
2171 if (optval != icmp6off)
2172 error = EINVAL;
2173 } else
2174 in6p->in6p_cksum = optval;
2175 break;
2176
2177 case SOPT_GET:
2178 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
2179 optval = icmp6off;
2180 else
2181 optval = in6p->in6p_cksum;
2182
2183 error = sooptcopyout(sopt, &optval, sizeof(optval));
2184 break;
2185
2186 default:
2187 error = EINVAL;
2188 break;
2189 }
2190 break;
2191
2192 default:
2193 error = ENOPROTOOPT;
2194 break;
2195 }
2196
2197 return (error);
2198 }
2199
2200 /*
2201 * Set up IP6 options in pcb for insertion in output packets or
2202 * specifying behavior of outgoing packets.
2203 */
2204 static int
2205 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2206 struct socket *so, struct sockopt *sopt)
2207 {
2208 struct ip6_pktopts *opt = *pktopt;
2209 int error = 0;
2210 struct thread *td = sopt->sopt_td;
2211
2212 /* turn off any old options. */
2213 if (opt) {
2214 #ifdef DIAGNOSTIC
2215 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2216 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2217 opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2218 printf("ip6_pcbopts: all specified options are cleared.\n");
2219 #endif
2220 ip6_clearpktopts(opt, -1);
2221 } else
2222 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2223 *pktopt = NULL;
2224
2225 if (!m || m->m_len == 0) {
2226 /*
2227 * Only turning off any previous options, regardless of
2228 * whether the opt is just created or given.
2229 */
2230 free(opt, M_IP6OPT);
2231 return (0);
2232 }
2233
2234 /* set options specified by user. */
2235 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2236 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2237 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2238 free(opt, M_IP6OPT);
2239 return (error);
2240 }
2241 *pktopt = opt;
2242 return (0);
2243 }
2244
2245 /*
2246 * initialize ip6_pktopts. beware that there are non-zero default values in
2247 * the struct.
2248 */
2249 void
2250 ip6_initpktopts(struct ip6_pktopts *opt)
2251 {
2252
2253 bzero(opt, sizeof(*opt));
2254 opt->ip6po_hlim = -1; /* -1 means default hop limit */
2255 opt->ip6po_tclass = -1; /* -1 means default traffic class */
2256 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2257 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2258 }
2259
2260 static int
2261 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2262 struct ucred *cred, int uproto)
2263 {
2264 struct ip6_pktopts *opt;
2265
2266 if (*pktopt == NULL) {
2267 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2268 M_WAITOK);
2269 ip6_initpktopts(*pktopt);
2270 }
2271 opt = *pktopt;
2272
2273 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
2274 }
2275
2276 static int
2277 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt)
2278 {
2279 void *optdata = NULL;
2280 int optdatalen = 0;
2281 struct ip6_ext *ip6e;
2282 int error = 0;
2283 struct in6_pktinfo null_pktinfo;
2284 int deftclass = 0, on;
2285 int defminmtu = IP6PO_MINMTU_MCASTONLY;
2286 int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2287
2288 switch (optname) {
2289 case IPV6_PKTINFO:
2290 if (pktopt && pktopt->ip6po_pktinfo)
2291 optdata = (void *)pktopt->ip6po_pktinfo;
2292 else {
2293 /* XXX: we don't have to do this every time... */
2294 bzero(&null_pktinfo, sizeof(null_pktinfo));
2295 optdata = (void *)&null_pktinfo;
2296 }
2297 optdatalen = sizeof(struct in6_pktinfo);
2298 break;
2299 case IPV6_TCLASS:
2300 if (pktopt && pktopt->ip6po_tclass >= 0)
2301 optdata = (void *)&pktopt->ip6po_tclass;
2302 else
2303 optdata = (void *)&deftclass;
2304 optdatalen = sizeof(int);
2305 break;
2306 case IPV6_HOPOPTS:
2307 if (pktopt && pktopt->ip6po_hbh) {
2308 optdata = (void *)pktopt->ip6po_hbh;
2309 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
2310 optdatalen = (ip6e->ip6e_len + 1) << 3;
2311 }
2312 break;
2313 case IPV6_RTHDR:
2314 if (pktopt && pktopt->ip6po_rthdr) {
2315 optdata = (void *)pktopt->ip6po_rthdr;
2316 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
2317 optdatalen = (ip6e->ip6e_len + 1) << 3;
2318 }
2319 break;
2320 case IPV6_RTHDRDSTOPTS:
2321 if (pktopt && pktopt->ip6po_dest1) {
2322 optdata = (void *)pktopt->ip6po_dest1;
2323 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
2324 optdatalen = (ip6e->ip6e_len + 1) << 3;
2325 }
2326 break;
2327 case IPV6_DSTOPTS:
2328 if (pktopt && pktopt->ip6po_dest2) {
2329 optdata = (void *)pktopt->ip6po_dest2;
2330 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
2331 optdatalen = (ip6e->ip6e_len + 1) << 3;
2332 }
2333 break;
2334 case IPV6_NEXTHOP:
2335 if (pktopt && pktopt->ip6po_nexthop) {
2336 optdata = (void *)pktopt->ip6po_nexthop;
2337 optdatalen = pktopt->ip6po_nexthop->sa_len;
2338 }
2339 break;
2340 case IPV6_USE_MIN_MTU:
2341 if (pktopt)
2342 optdata = (void *)&pktopt->ip6po_minmtu;
2343 else
2344 optdata = (void *)&defminmtu;
2345 optdatalen = sizeof(int);
2346 break;
2347 case IPV6_DONTFRAG:
2348 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2349 on = 1;
2350 else
2351 on = 0;
2352 optdata = (void *)&on;
2353 optdatalen = sizeof(on);
2354 break;
2355 case IPV6_PREFER_TEMPADDR:
2356 if (pktopt)
2357 optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
2358 else
2359 optdata = (void *)&defpreftemp;
2360 optdatalen = sizeof(int);
2361 break;
2362 default: /* should not happen */
2363 #ifdef DIAGNOSTIC
2364 panic("ip6_getpcbopt: unexpected option\n");
2365 #endif
2366 return (ENOPROTOOPT);
2367 }
2368
2369 error = sooptcopyout(sopt, optdata, optdatalen);
2370
2371 return (error);
2372 }
2373
2374 void
2375 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2376 {
2377 if (pktopt == NULL)
2378 return;
2379
2380 if (optname == -1 || optname == IPV6_PKTINFO) {
2381 if (pktopt->ip6po_pktinfo)
2382 free(pktopt->ip6po_pktinfo, M_IP6OPT);
2383 pktopt->ip6po_pktinfo = NULL;
2384 }
2385 if (optname == -1 || optname == IPV6_HOPLIMIT)
2386 pktopt->ip6po_hlim = -1;
2387 if (optname == -1 || optname == IPV6_TCLASS)
2388 pktopt->ip6po_tclass = -1;
2389 if (optname == -1 || optname == IPV6_NEXTHOP) {
2390 if (pktopt->ip6po_nextroute.ro_rt) {
2391 RTFREE(pktopt->ip6po_nextroute.ro_rt);
2392 pktopt->ip6po_nextroute.ro_rt = NULL;
2393 }
2394 if (pktopt->ip6po_nexthop)
2395 free(pktopt->ip6po_nexthop, M_IP6OPT);
2396 pktopt->ip6po_nexthop = NULL;
2397 }
2398 if (optname == -1 || optname == IPV6_HOPOPTS) {
2399 if (pktopt->ip6po_hbh)
2400 free(pktopt->ip6po_hbh, M_IP6OPT);
2401 pktopt->ip6po_hbh = NULL;
2402 }
2403 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2404 if (pktopt->ip6po_dest1)
2405 free(pktopt->ip6po_dest1, M_IP6OPT);
2406 pktopt->ip6po_dest1 = NULL;
2407 }
2408 if (optname == -1 || optname == IPV6_RTHDR) {
2409 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2410 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2411 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2412 if (pktopt->ip6po_route.ro_rt) {
2413 RTFREE(pktopt->ip6po_route.ro_rt);
2414 pktopt->ip6po_route.ro_rt = NULL;
2415 }
2416 }
2417 if (optname == -1 || optname == IPV6_DSTOPTS) {
2418 if (pktopt->ip6po_dest2)
2419 free(pktopt->ip6po_dest2, M_IP6OPT);
2420 pktopt->ip6po_dest2 = NULL;
2421 }
2422 }
2423
2424 #define PKTOPT_EXTHDRCPY(type) \
2425 do {\
2426 if (src->type) {\
2427 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2428 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2429 if (dst->type == NULL && canwait == M_NOWAIT)\
2430 goto bad;\
2431 bcopy(src->type, dst->type, hlen);\
2432 }\
2433 } while (/*CONSTCOND*/ 0)
2434
2435 static int
2436 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2437 {
2438 if (dst == NULL || src == NULL) {
2439 printf("ip6_clearpktopts: invalid argument\n");
2440 return (EINVAL);
2441 }
2442
2443 dst->ip6po_hlim = src->ip6po_hlim;
2444 dst->ip6po_tclass = src->ip6po_tclass;
2445 dst->ip6po_flags = src->ip6po_flags;
2446 dst->ip6po_minmtu = src->ip6po_minmtu;
2447 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2448 if (src->ip6po_pktinfo) {
2449 dst->ip6po_pktinfo = malloc(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 = malloc(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 struct ip6_pktopts *
2476 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2477 {
2478 int error;
2479 struct ip6_pktopts *dst;
2480
2481 dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2482 if (dst == NULL)
2483 return (NULL);
2484 ip6_initpktopts(dst);
2485
2486 if ((error = copypktopts(dst, src, canwait)) != 0) {
2487 free(dst, M_IP6OPT);
2488 return (NULL);
2489 }
2490
2491 return (dst);
2492 }
2493
2494 void
2495 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2496 {
2497 if (pktopt == NULL)
2498 return;
2499
2500 ip6_clearpktopts(pktopt, -1);
2501
2502 free(pktopt, M_IP6OPT);
2503 }
2504
2505 /*
2506 * Set IPv6 outgoing packet options based on advanced API.
2507 */
2508 int
2509 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2510 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2511 {
2512 struct cmsghdr *cm = 0;
2513
2514 if (control == NULL || opt == NULL)
2515 return (EINVAL);
2516
2517 ip6_initpktopts(opt);
2518 if (stickyopt) {
2519 int error;
2520
2521 /*
2522 * If stickyopt is provided, make a local copy of the options
2523 * for this particular packet, then override them by ancillary
2524 * objects.
2525 * XXX: copypktopts() does not copy the cached route to a next
2526 * hop (if any). This is not very good in terms of efficiency,
2527 * but we can allow this since this option should be rarely
2528 * used.
2529 */
2530 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2531 return (error);
2532 }
2533
2534 /*
2535 * XXX: Currently, we assume all the optional information is stored
2536 * in a single mbuf.
2537 */
2538 if (control->m_next)
2539 return (EINVAL);
2540
2541 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2542 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2543 int error;
2544
2545 if (control->m_len < CMSG_LEN(0))
2546 return (EINVAL);
2547
2548 cm = mtod(control, struct cmsghdr *);
2549 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2550 return (EINVAL);
2551 if (cm->cmsg_level != IPPROTO_IPV6)
2552 continue;
2553
2554 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2555 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2556 if (error)
2557 return (error);
2558 }
2559
2560 return (0);
2561 }
2562
2563 /*
2564 * Set a particular packet option, as a sticky option or an ancillary data
2565 * item. "len" can be 0 only when it's a sticky option.
2566 * We have 4 cases of combination of "sticky" and "cmsg":
2567 * "sticky=0, cmsg=0": impossible
2568 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2569 * "sticky=1, cmsg=0": RFC3542 socket option
2570 * "sticky=1, cmsg=1": RFC2292 socket option
2571 */
2572 static int
2573 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2574 struct ucred *cred, int sticky, int cmsg, int uproto)
2575 {
2576 int minmtupolicy, preftemp;
2577 int error;
2578
2579 if (!sticky && !cmsg) {
2580 #ifdef DIAGNOSTIC
2581 printf("ip6_setpktopt: impossible case\n");
2582 #endif
2583 return (EINVAL);
2584 }
2585
2586 /*
2587 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2588 * not be specified in the context of RFC3542. Conversely,
2589 * RFC3542 types should not be specified in the context of RFC2292.
2590 */
2591 if (!cmsg) {
2592 switch (optname) {
2593 case IPV6_2292PKTINFO:
2594 case IPV6_2292HOPLIMIT:
2595 case IPV6_2292NEXTHOP:
2596 case IPV6_2292HOPOPTS:
2597 case IPV6_2292DSTOPTS:
2598 case IPV6_2292RTHDR:
2599 case IPV6_2292PKTOPTIONS:
2600 return (ENOPROTOOPT);
2601 }
2602 }
2603 if (sticky && cmsg) {
2604 switch (optname) {
2605 case IPV6_PKTINFO:
2606 case IPV6_HOPLIMIT:
2607 case IPV6_NEXTHOP:
2608 case IPV6_HOPOPTS:
2609 case IPV6_DSTOPTS:
2610 case IPV6_RTHDRDSTOPTS:
2611 case IPV6_RTHDR:
2612 case IPV6_USE_MIN_MTU:
2613 case IPV6_DONTFRAG:
2614 case IPV6_TCLASS:
2615 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2616 return (ENOPROTOOPT);
2617 }
2618 }
2619
2620 switch (optname) {
2621 case IPV6_2292PKTINFO:
2622 case IPV6_PKTINFO:
2623 {
2624 struct ifnet *ifp = NULL;
2625 struct in6_pktinfo *pktinfo;
2626
2627 if (len != sizeof(struct in6_pktinfo))
2628 return (EINVAL);
2629
2630 pktinfo = (struct in6_pktinfo *)buf;
2631
2632 /*
2633 * An application can clear any sticky IPV6_PKTINFO option by
2634 * doing a "regular" setsockopt with ipi6_addr being
2635 * in6addr_any and ipi6_ifindex being zero.
2636 * [RFC 3542, Section 6]
2637 */
2638 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2639 pktinfo->ipi6_ifindex == 0 &&
2640 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2641 ip6_clearpktopts(opt, optname);
2642 break;
2643 }
2644
2645 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2646 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2647 return (EINVAL);
2648 }
2649
2650 /* validate the interface index if specified. */
2651 if (pktinfo->ipi6_ifindex > V_if_index ||
2652 pktinfo->ipi6_ifindex < 0) {
2653 return (ENXIO);
2654 }
2655 if (pktinfo->ipi6_ifindex) {
2656 ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2657 if (ifp == NULL)
2658 return (ENXIO);
2659 }
2660
2661 /*
2662 * We store the address anyway, and let in6_selectsrc()
2663 * validate the specified address. This is because ipi6_addr
2664 * may not have enough information about its scope zone, and
2665 * we may need additional information (such as outgoing
2666 * interface or the scope zone of a destination address) to
2667 * disambiguate the scope.
2668 * XXX: the delay of the validation may confuse the
2669 * application when it is used as a sticky option.
2670 */
2671 if (opt->ip6po_pktinfo == NULL) {
2672 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2673 M_IP6OPT, M_NOWAIT);
2674 if (opt->ip6po_pktinfo == NULL)
2675 return (ENOBUFS);
2676 }
2677 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2678 break;
2679 }
2680
2681 case IPV6_2292HOPLIMIT:
2682 case IPV6_HOPLIMIT:
2683 {
2684 int *hlimp;
2685
2686 /*
2687 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2688 * to simplify the ordering among hoplimit options.
2689 */
2690 if (optname == IPV6_HOPLIMIT && sticky)
2691 return (ENOPROTOOPT);
2692
2693 if (len != sizeof(int))
2694 return (EINVAL);
2695 hlimp = (int *)buf;
2696 if (*hlimp < -1 || *hlimp > 255)
2697 return (EINVAL);
2698
2699 opt->ip6po_hlim = *hlimp;
2700 break;
2701 }
2702
2703 case IPV6_TCLASS:
2704 {
2705 int tclass;
2706
2707 if (len != sizeof(int))
2708 return (EINVAL);
2709 tclass = *(int *)buf;
2710 if (tclass < -1 || tclass > 255)
2711 return (EINVAL);
2712
2713 opt->ip6po_tclass = tclass;
2714 break;
2715 }
2716
2717 case IPV6_2292NEXTHOP:
2718 case IPV6_NEXTHOP:
2719 if (cred != NULL) {
2720 error = priv_check_cred(cred,
2721 PRIV_NETINET_SETHDROPTS, 0);
2722 if (error)
2723 return (error);
2724 }
2725
2726 if (len == 0) { /* just remove the option */
2727 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2728 break;
2729 }
2730
2731 /* check if cmsg_len is large enough for sa_len */
2732 if (len < sizeof(struct sockaddr) || len < *buf)
2733 return (EINVAL);
2734
2735 switch (((struct sockaddr *)buf)->sa_family) {
2736 case AF_INET6:
2737 {
2738 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
2739 int error;
2740
2741 if (sa6->sin6_len != sizeof(struct sockaddr_in6))
2742 return (EINVAL);
2743
2744 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
2745 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
2746 return (EINVAL);
2747 }
2748 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
2749 != 0) {
2750 return (error);
2751 }
2752 break;
2753 }
2754 case AF_LINK: /* should eventually be supported */
2755 default:
2756 return (EAFNOSUPPORT);
2757 }
2758
2759 /* turn off the previous option, then set the new option. */
2760 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2761 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
2762 if (opt->ip6po_nexthop == NULL)
2763 return (ENOBUFS);
2764 bcopy(buf, opt->ip6po_nexthop, *buf);
2765 break;
2766
2767 case IPV6_2292HOPOPTS:
2768 case IPV6_HOPOPTS:
2769 {
2770 struct ip6_hbh *hbh;
2771 int hbhlen;
2772
2773 /*
2774 * XXX: We don't allow a non-privileged user to set ANY HbH
2775 * options, since per-option restriction has too much
2776 * overhead.
2777 */
2778 if (cred != NULL) {
2779 error = priv_check_cred(cred,
2780 PRIV_NETINET_SETHDROPTS, 0);
2781 if (error)
2782 return (error);
2783 }
2784
2785 if (len == 0) {
2786 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2787 break; /* just remove the option */
2788 }
2789
2790 /* message length validation */
2791 if (len < sizeof(struct ip6_hbh))
2792 return (EINVAL);
2793 hbh = (struct ip6_hbh *)buf;
2794 hbhlen = (hbh->ip6h_len + 1) << 3;
2795 if (len != hbhlen)
2796 return (EINVAL);
2797
2798 /* turn off the previous option, then set the new option. */
2799 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2800 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
2801 if (opt->ip6po_hbh == NULL)
2802 return (ENOBUFS);
2803 bcopy(hbh, opt->ip6po_hbh, hbhlen);
2804
2805 break;
2806 }
2807
2808 case IPV6_2292DSTOPTS:
2809 case IPV6_DSTOPTS:
2810 case IPV6_RTHDRDSTOPTS:
2811 {
2812 struct ip6_dest *dest, **newdest = NULL;
2813 int destlen;
2814
2815 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
2816 error = priv_check_cred(cred,
2817 PRIV_NETINET_SETHDROPTS, 0);
2818 if (error)
2819 return (error);
2820 }
2821
2822 if (len == 0) {
2823 ip6_clearpktopts(opt, optname);
2824 break; /* just remove the option */
2825 }
2826
2827 /* message length validation */
2828 if (len < sizeof(struct ip6_dest))
2829 return (EINVAL);
2830 dest = (struct ip6_dest *)buf;
2831 destlen = (dest->ip6d_len + 1) << 3;
2832 if (len != destlen)
2833 return (EINVAL);
2834
2835 /*
2836 * Determine the position that the destination options header
2837 * should be inserted; before or after the routing header.
2838 */
2839 switch (optname) {
2840 case IPV6_2292DSTOPTS:
2841 /*
2842 * The old advacned API is ambiguous on this point.
2843 * Our approach is to determine the position based
2844 * according to the existence of a routing header.
2845 * Note, however, that this depends on the order of the
2846 * extension headers in the ancillary data; the 1st
2847 * part of the destination options header must appear
2848 * before the routing header in the ancillary data,
2849 * too.
2850 * RFC3542 solved the ambiguity by introducing
2851 * separate ancillary data or option types.
2852 */
2853 if (opt->ip6po_rthdr == NULL)
2854 newdest = &opt->ip6po_dest1;
2855 else
2856 newdest = &opt->ip6po_dest2;
2857 break;
2858 case IPV6_RTHDRDSTOPTS:
2859 newdest = &opt->ip6po_dest1;
2860 break;
2861 case IPV6_DSTOPTS:
2862 newdest = &opt->ip6po_dest2;
2863 break;
2864 }
2865
2866 /* turn off the previous option, then set the new option. */
2867 ip6_clearpktopts(opt, optname);
2868 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
2869 if (*newdest == NULL)
2870 return (ENOBUFS);
2871 bcopy(dest, *newdest, destlen);
2872
2873 break;
2874 }
2875
2876 case IPV6_2292RTHDR:
2877 case IPV6_RTHDR:
2878 {
2879 struct ip6_rthdr *rth;
2880 int rthlen;
2881
2882 if (len == 0) {
2883 ip6_clearpktopts(opt, IPV6_RTHDR);
2884 break; /* just remove the option */
2885 }
2886
2887 /* message length validation */
2888 if (len < sizeof(struct ip6_rthdr))
2889 return (EINVAL);
2890 rth = (struct ip6_rthdr *)buf;
2891 rthlen = (rth->ip6r_len + 1) << 3;
2892 if (len != rthlen)
2893 return (EINVAL);
2894
2895 switch (rth->ip6r_type) {
2896 case IPV6_RTHDR_TYPE_0:
2897 if (rth->ip6r_len == 0) /* must contain one addr */
2898 return (EINVAL);
2899 if (rth->ip6r_len % 2) /* length must be even */
2900 return (EINVAL);
2901 if (rth->ip6r_len / 2 != rth->ip6r_segleft)
2902 return (EINVAL);
2903 break;
2904 default:
2905 return (EINVAL); /* not supported */
2906 }
2907
2908 /* turn off the previous option */
2909 ip6_clearpktopts(opt, IPV6_RTHDR);
2910 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
2911 if (opt->ip6po_rthdr == NULL)
2912 return (ENOBUFS);
2913 bcopy(rth, opt->ip6po_rthdr, rthlen);
2914
2915 break;
2916 }
2917
2918 case IPV6_USE_MIN_MTU:
2919 if (len != sizeof(int))
2920 return (EINVAL);
2921 minmtupolicy = *(int *)buf;
2922 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
2923 minmtupolicy != IP6PO_MINMTU_DISABLE &&
2924 minmtupolicy != IP6PO_MINMTU_ALL) {
2925 return (EINVAL);
2926 }
2927 opt->ip6po_minmtu = minmtupolicy;
2928 break;
2929
2930 case IPV6_DONTFRAG:
2931 if (len != sizeof(int))
2932 return (EINVAL);
2933
2934 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
2935 /*
2936 * we ignore this option for TCP sockets.
2937 * (RFC3542 leaves this case unspecified.)
2938 */
2939 opt->ip6po_flags &= ~IP6PO_DONTFRAG;
2940 } else
2941 opt->ip6po_flags |= IP6PO_DONTFRAG;
2942 break;
2943
2944 case IPV6_PREFER_TEMPADDR:
2945 if (len != sizeof(int))
2946 return (EINVAL);
2947 preftemp = *(int *)buf;
2948 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
2949 preftemp != IP6PO_TEMPADDR_NOTPREFER &&
2950 preftemp != IP6PO_TEMPADDR_PREFER) {
2951 return (EINVAL);
2952 }
2953 opt->ip6po_prefer_tempaddr = preftemp;
2954 break;
2955
2956 default:
2957 return (ENOPROTOOPT);
2958 } /* end of switch */
2959
2960 return (0);
2961 }
2962
2963 /*
2964 * Routine called from ip6_output() to loop back a copy of an IP6 multicast
2965 * packet to the input queue of a specified interface. Note that this
2966 * calls the output routine of the loopback "driver", but with an interface
2967 * pointer that might NOT be &loif -- easier than replicating that code here.
2968 */
2969 void
2970 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst)
2971 {
2972 struct mbuf *copym;
2973 struct ip6_hdr *ip6;
2974
2975 copym = m_copy(m, 0, M_COPYALL);
2976 if (copym == NULL)
2977 return;
2978
2979 /*
2980 * Make sure to deep-copy IPv6 header portion in case the data
2981 * is in an mbuf cluster, so that we can safely override the IPv6
2982 * header portion later.
2983 */
2984 if ((copym->m_flags & M_EXT) != 0 ||
2985 copym->m_len < sizeof(struct ip6_hdr)) {
2986 copym = m_pullup(copym, sizeof(struct ip6_hdr));
2987 if (copym == NULL)
2988 return;
2989 }
2990
2991 #ifdef DIAGNOSTIC
2992 if (copym->m_len < sizeof(*ip6)) {
2993 m_freem(copym);
2994 return;
2995 }
2996 #endif
2997
2998 ip6 = mtod(copym, struct ip6_hdr *);
2999 /*
3000 * clear embedded scope identifiers if necessary.
3001 * in6_clearscope will touch the addresses only when necessary.
3002 */
3003 in6_clearscope(&ip6->ip6_src);
3004 in6_clearscope(&ip6->ip6_dst);
3005
3006 (void)if_simloop(ifp, copym, dst->sin6_family, 0);
3007 }
3008
3009 /*
3010 * Chop IPv6 header off from the payload.
3011 */
3012 static int
3013 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
3014 {
3015 struct mbuf *mh;
3016 struct ip6_hdr *ip6;
3017
3018 ip6 = mtod(m, struct ip6_hdr *);
3019 if (m->m_len > sizeof(*ip6)) {
3020 mh = m_gethdr(M_NOWAIT, MT_DATA);
3021 if (mh == NULL) {
3022 m_freem(m);
3023 return ENOBUFS;
3024 }
3025 m_move_pkthdr(mh, m);
3026 MH_ALIGN(mh, sizeof(*ip6));
3027 m->m_len -= sizeof(*ip6);
3028 m->m_data += sizeof(*ip6);
3029 mh->m_next = m;
3030 m = mh;
3031 m->m_len = sizeof(*ip6);
3032 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
3033 }
3034 exthdrs->ip6e_ip6 = m;
3035 return 0;
3036 }
3037
3038 /*
3039 * Compute IPv6 extension header length.
3040 */
3041 int
3042 ip6_optlen(struct inpcb *in6p)
3043 {
3044 int len;
3045
3046 if (!in6p->in6p_outputopts)
3047 return 0;
3048
3049 len = 0;
3050 #define elen(x) \
3051 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
3052
3053 len += elen(in6p->in6p_outputopts->ip6po_hbh);
3054 if (in6p->in6p_outputopts->ip6po_rthdr)
3055 /* dest1 is valid with rthdr only */
3056 len += elen(in6p->in6p_outputopts->ip6po_dest1);
3057 len += elen(in6p->in6p_outputopts->ip6po_rthdr);
3058 len += elen(in6p->in6p_outputopts->ip6po_dest2);
3059 return len;
3060 #undef elen
3061 }
Cache object: c4e65de6cd439735b1a63af864a55932
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