1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $
32 */
33
34 /*-
35 * Copyright (c) 1982, 1986, 1988, 1990, 1993
36 * The Regents of the University of California. All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 */
62
63 #include "opt_inet.h"
64 #include "opt_inet6.h"
65 #include "opt_ipsec.h"
66 #include "opt_kern_tls.h"
67 #include "opt_ratelimit.h"
68 #include "opt_route.h"
69 #include "opt_rss.h"
70 #include "opt_sctp.h"
71
72 #include <sys/param.h>
73 #include <sys/kernel.h>
74 #include <sys/ktls.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/if_var.h>
90 #include <net/if_private.h>
91 #include <net/if_vlan_var.h>
92 #include <net/if_llatbl.h>
93 #include <net/ethernet.h>
94 #include <net/netisr.h>
95 #include <net/route.h>
96 #include <net/route/nhop.h>
97 #include <net/pfil.h>
98 #include <net/rss_config.h>
99 #include <net/vnet.h>
100
101 #include <netinet/in.h>
102 #include <netinet/in_var.h>
103 #include <netinet/ip_var.h>
104 #include <netinet6/in6_fib.h>
105 #include <netinet6/in6_var.h>
106 #include <netinet/ip6.h>
107 #include <netinet/icmp6.h>
108 #include <netinet6/ip6_var.h>
109 #include <netinet/in_pcb.h>
110 #include <netinet/tcp_var.h>
111 #include <netinet6/nd6.h>
112 #include <netinet6/in6_rss.h>
113
114 #include <netipsec/ipsec_support.h>
115 #if defined(SCTP) || defined(SCTP_SUPPORT)
116 #include <netinet/sctp.h>
117 #include <netinet/sctp_crc32.h>
118 #endif
119
120 #include <netinet6/scope6_var.h>
121
122 extern int in6_mcast_loop;
123
124 struct ip6_exthdrs {
125 struct mbuf *ip6e_ip6;
126 struct mbuf *ip6e_hbh;
127 struct mbuf *ip6e_dest1;
128 struct mbuf *ip6e_rthdr;
129 struct mbuf *ip6e_dest2;
130 };
131
132 static MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
133
134 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **,
135 struct ucred *, int);
136 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *,
137 struct socket *, struct sockopt *);
138 static int ip6_getpcbopt(struct inpcb *, int, struct sockopt *);
139 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *,
140 struct ucred *, int, int, int);
141
142 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
143 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
144 struct ip6_frag **);
145 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
146 static void ip6_getpmtu(struct route_in6 *, int,
147 struct ifnet *, const struct in6_addr *, u_long *, u_int, u_int);
148 static void ip6_calcmtu(struct ifnet *, const struct in6_addr *, u_long,
149 u_long *, u_int);
150 static int ip6_getpmtu_ctl(u_int, const struct in6_addr *, u_long *);
151 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
152
153 /*
154 * Make an extension header from option data. hp is the source,
155 * mp is the destination, and _ol is the optlen.
156 */
157 #define MAKE_EXTHDR(hp, mp, _ol) \
158 do { \
159 struct ip6_ext *eh = (struct ip6_ext *)(hp); \
160 error = ip6_copyexthdr((mp), (caddr_t)(hp), \
161 ((eh)->ip6e_len + 1) << 3); \
162 if (error) \
163 goto freehdrs; \
164 (_ol) += (*(mp))->m_len; \
165 } while (/*CONSTCOND*/ 0)
166
167 /*
168 * Form a chain of extension headers.
169 * m is the extension header mbuf
170 * mp is the previous mbuf in the chain
171 * p is the next header
172 * i is the type of option.
173 */
174 #define MAKE_CHAIN(m, mp, p, i)\
175 do {\
176 if (m) {\
177 if (!hdrsplit) \
178 panic("%s:%d: assumption failed: "\
179 "hdr not split: hdrsplit %d exthdrs %p",\
180 __func__, __LINE__, hdrsplit, &exthdrs);\
181 *mtod((m), u_char *) = *(p);\
182 *(p) = (i);\
183 p = mtod((m), u_char *);\
184 (m)->m_next = (mp)->m_next;\
185 (mp)->m_next = (m);\
186 (mp) = (m);\
187 }\
188 } while (/*CONSTCOND*/ 0)
189
190 void
in6_delayed_cksum(struct mbuf * m,uint32_t plen,u_short offset)191 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
192 {
193 u_short csum;
194
195 csum = in_cksum_skip(m, offset + plen, offset);
196 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
197 csum = 0xffff;
198 offset += m->m_pkthdr.csum_data; /* checksum offset */
199
200 if (offset + sizeof(csum) > m->m_len)
201 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
202 else
203 *(u_short *)mtodo(m, offset) = csum;
204 }
205
206 static void
ip6_output_delayed_csum(struct mbuf * m,struct ifnet * ifp,int csum_flags,int plen,int optlen)207 ip6_output_delayed_csum(struct mbuf *m, struct ifnet *ifp, int csum_flags,
208 int plen, int optlen)
209 {
210
211 KASSERT((plen >= optlen), ("%s:%d: plen %d < optlen %d, m %p, ifp %p "
212 "csum_flags %#x",
213 __func__, __LINE__, plen, optlen, m, ifp, csum_flags));
214
215 if (csum_flags & CSUM_DELAY_DATA_IPV6) {
216 in6_delayed_cksum(m, plen - optlen,
217 sizeof(struct ip6_hdr) + optlen);
218 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
219 }
220 #if defined(SCTP) || defined(SCTP_SUPPORT)
221 if (csum_flags & CSUM_SCTP_IPV6) {
222 sctp_delayed_cksum(m, sizeof(struct ip6_hdr) + optlen);
223 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
224 }
225 #endif
226 }
227
228 int
ip6_fragment(struct ifnet * ifp,struct mbuf * m0,int hlen,u_char nextproto,int fraglen,uint32_t id)229 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto,
230 int fraglen , uint32_t id)
231 {
232 struct mbuf *m, **mnext, *m_frgpart;
233 struct ip6_hdr *ip6, *mhip6;
234 struct ip6_frag *ip6f;
235 int off;
236 int error;
237 int tlen = m0->m_pkthdr.len;
238
239 KASSERT((fraglen % 8 == 0), ("Fragment length must be a multiple of 8"));
240
241 m = m0;
242 ip6 = mtod(m, struct ip6_hdr *);
243 mnext = &m->m_nextpkt;
244
245 for (off = hlen; off < tlen; off += fraglen) {
246 m = m_gethdr(M_NOWAIT, MT_DATA);
247 if (!m) {
248 IP6STAT_INC(ip6s_odropped);
249 return (ENOBUFS);
250 }
251
252 /*
253 * Make sure the complete packet header gets copied
254 * from the originating mbuf to the newly created
255 * mbuf. This also ensures that existing firewall
256 * classification(s), VLAN tags and so on get copied
257 * to the resulting fragmented packet(s):
258 */
259 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
260 m_free(m);
261 IP6STAT_INC(ip6s_odropped);
262 return (ENOBUFS);
263 }
264
265 *mnext = m;
266 mnext = &m->m_nextpkt;
267 m->m_data += max_linkhdr;
268 mhip6 = mtod(m, struct ip6_hdr *);
269 *mhip6 = *ip6;
270 m->m_len = sizeof(*mhip6);
271 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
272 if (error) {
273 IP6STAT_INC(ip6s_odropped);
274 return (error);
275 }
276 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
277 if (off + fraglen >= tlen)
278 fraglen = tlen - off;
279 else
280 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
281 mhip6->ip6_plen = htons((u_short)(fraglen + hlen +
282 sizeof(*ip6f) - sizeof(struct ip6_hdr)));
283 if ((m_frgpart = m_copym(m0, off, fraglen, M_NOWAIT)) == NULL) {
284 IP6STAT_INC(ip6s_odropped);
285 return (ENOBUFS);
286 }
287 m_cat(m, m_frgpart);
288 m->m_pkthdr.len = fraglen + hlen + sizeof(*ip6f);
289 ip6f->ip6f_reserved = 0;
290 ip6f->ip6f_ident = id;
291 ip6f->ip6f_nxt = nextproto;
292 IP6STAT_INC(ip6s_ofragments);
293 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
294 }
295
296 return (0);
297 }
298
299 static int
ip6_output_send(struct inpcb * inp,struct ifnet * ifp,struct ifnet * origifp,struct mbuf * m,struct sockaddr_in6 * dst,struct route_in6 * ro,bool stamp_tag)300 ip6_output_send(struct inpcb *inp, struct ifnet *ifp, struct ifnet *origifp,
301 struct mbuf *m, struct sockaddr_in6 *dst, struct route_in6 *ro,
302 bool stamp_tag)
303 {
304 #ifdef KERN_TLS
305 struct ktls_session *tls = NULL;
306 #endif
307 struct m_snd_tag *mst;
308 int error;
309
310 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
311 mst = NULL;
312
313 #ifdef KERN_TLS
314 /*
315 * If this is an unencrypted TLS record, save a reference to
316 * the record. This local reference is used to call
317 * ktls_output_eagain after the mbuf has been freed (thus
318 * dropping the mbuf's reference) in if_output.
319 */
320 if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) {
321 tls = ktls_hold(m->m_next->m_epg_tls);
322 mst = tls->snd_tag;
323
324 /*
325 * If a TLS session doesn't have a valid tag, it must
326 * have had an earlier ifp mismatch, so drop this
327 * packet.
328 */
329 if (mst == NULL) {
330 m_freem(m);
331 error = EAGAIN;
332 goto done;
333 }
334 /*
335 * Always stamp tags that include NIC ktls.
336 */
337 stamp_tag = true;
338 }
339 #endif
340 #ifdef RATELIMIT
341 if (inp != NULL && mst == NULL) {
342 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 ||
343 (inp->inp_snd_tag != NULL &&
344 inp->inp_snd_tag->ifp != ifp))
345 in_pcboutput_txrtlmt(inp, ifp, m);
346
347 if (inp->inp_snd_tag != NULL)
348 mst = inp->inp_snd_tag;
349 }
350 #endif
351 if (stamp_tag && mst != NULL) {
352 KASSERT(m->m_pkthdr.rcvif == NULL,
353 ("trying to add a send tag to a forwarded packet"));
354 if (mst->ifp != ifp) {
355 m_freem(m);
356 error = EAGAIN;
357 goto done;
358 }
359
360 /* stamp send tag on mbuf */
361 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst);
362 m->m_pkthdr.csum_flags |= CSUM_SND_TAG;
363 }
364
365 error = nd6_output_ifp(ifp, origifp, m, dst, (struct route *)ro);
366
367 done:
368 /* Check for route change invalidating send tags. */
369 #ifdef KERN_TLS
370 if (tls != NULL) {
371 if (error == EAGAIN)
372 error = ktls_output_eagain(inp, tls);
373 ktls_free(tls);
374 }
375 #endif
376 #ifdef RATELIMIT
377 if (error == EAGAIN)
378 in_pcboutput_eagain(inp);
379 #endif
380 return (error);
381 }
382
383 /*
384 * IP6 output.
385 * The packet in mbuf chain m contains a skeletal IP6 header (with pri, len,
386 * nxt, hlim, src, dst).
387 * This function may modify ver and hlim only.
388 * The mbuf chain containing the packet will be freed.
389 * The mbuf opt, if present, will not be freed.
390 * If route_in6 ro is present and has ro_nh initialized, route lookup would be
391 * skipped and ro->ro_nh would be used. If ro is present but ro->ro_nh is NULL,
392 * then result of route lookup is stored in ro->ro_nh.
393 *
394 * Type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and nd_ifinfo.linkmtu
395 * is uint32_t. So we use u_long to hold largest one, which is rt_mtu.
396 *
397 * ifpp - XXX: just for statistics
398 */
399 int
ip6_output(struct mbuf * m0,struct ip6_pktopts * opt,struct route_in6 * ro,int flags,struct ip6_moptions * im6o,struct ifnet ** ifpp,struct inpcb * inp)400 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
401 struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
402 struct ifnet **ifpp, struct inpcb *inp)
403 {
404 struct ip6_hdr *ip6;
405 struct ifnet *ifp, *origifp;
406 struct mbuf *m = m0;
407 struct mbuf *mprev;
408 struct route_in6 *ro_pmtu;
409 struct nhop_object *nh;
410 struct sockaddr_in6 *dst, sin6, src_sa, dst_sa;
411 struct in6_addr odst;
412 u_char *nexthdrp;
413 int tlen, len;
414 int error = 0;
415 int vlan_pcp = -1;
416 struct in6_ifaddr *ia = NULL;
417 u_long mtu;
418 int dontfrag;
419 u_int32_t optlen, plen = 0, unfragpartlen;
420 struct ip6_exthdrs exthdrs;
421 struct in6_addr src0, dst0;
422 u_int32_t zone;
423 bool hdrsplit;
424 int sw_csum, tso;
425 int needfiblookup;
426 uint32_t fibnum;
427 struct m_tag *fwd_tag = NULL;
428 uint32_t id;
429 uint32_t optvalid;
430
431 NET_EPOCH_ASSERT();
432
433 if (inp != NULL) {
434 INP_LOCK_ASSERT(inp);
435 M_SETFIB(m, inp->inp_inc.inc_fibnum);
436 if ((flags & IP_NODEFAULTFLOWID) == 0) {
437 /* Unconditionally set flowid. */
438 m->m_pkthdr.flowid = inp->inp_flowid;
439 M_HASHTYPE_SET(m, inp->inp_flowtype);
440 }
441 if ((inp->inp_flags2 & INP_2PCP_SET) != 0)
442 vlan_pcp = (inp->inp_flags2 & INP_2PCP_MASK) >>
443 INP_2PCP_SHIFT;
444 #ifdef NUMA
445 m->m_pkthdr.numa_domain = inp->inp_numa_domain;
446 #endif
447 }
448
449 /* Source address validation. */
450 ip6 = mtod(m, struct ip6_hdr *);
451 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
452 (flags & IPV6_UNSPECSRC) == 0) {
453 error = EOPNOTSUPP;
454 IP6STAT_INC(ip6s_badscope);
455 goto bad;
456 }
457 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
458 error = EOPNOTSUPP;
459 IP6STAT_INC(ip6s_badscope);
460 goto bad;
461 }
462
463 /*
464 * If we are given packet options to add extension headers prepare them.
465 * Calculate the total length of the extension header chain.
466 * Keep the length of the unfragmentable part for fragmentation.
467 */
468 bzero(&exthdrs, sizeof(exthdrs));
469 optlen = optvalid = 0;
470 unfragpartlen = sizeof(struct ip6_hdr);
471 if (opt) {
472 optvalid = opt->ip6po_valid;
473
474 /* Hop-by-Hop options header. */
475 if ((optvalid & IP6PO_VALID_HBH) != 0)
476 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh, optlen);
477
478 /* Destination options header (1st part). */
479 if ((optvalid & IP6PO_VALID_RHINFO) != 0) {
480 #ifndef RTHDR_SUPPORT_IMPLEMENTED
481 /*
482 * If there is a routing header, discard the packet
483 * right away here. RH0/1 are obsolete and we do not
484 * currently support RH2/3/4.
485 * People trying to use RH253/254 may want to disable
486 * this check.
487 * The moment we do support any routing header (again)
488 * this block should check the routing type more
489 * selectively.
490 */
491 error = EINVAL;
492 goto bad;
493 #endif
494
495 /*
496 * Destination options header (1st part).
497 * This only makes sense with a routing header.
498 * See Section 9.2 of RFC 3542.
499 * Disabling this part just for MIP6 convenience is
500 * a bad idea. We need to think carefully about a
501 * way to make the advanced API coexist with MIP6
502 * options, which might automatically be inserted in
503 * the kernel.
504 */
505 if ((optvalid & IP6PO_VALID_DEST1) != 0)
506 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1,
507 optlen);
508 }
509 /* Routing header. */
510 if ((optvalid & IP6PO_VALID_RHINFO) != 0)
511 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr, optlen);
512
513 unfragpartlen += optlen;
514
515 /*
516 * NOTE: we don't add AH/ESP length here (done in
517 * ip6_ipsec_output()).
518 */
519
520 /* Destination options header (2nd part). */
521 if ((optvalid & IP6PO_VALID_DEST2) != 0)
522 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2, optlen);
523 }
524
525 /*
526 * If there is at least one extension header,
527 * separate IP6 header from the payload.
528 */
529 hdrsplit = false;
530 if (optlen) {
531 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
532 m = NULL;
533 goto freehdrs;
534 }
535 m = exthdrs.ip6e_ip6;
536 ip6 = mtod(m, struct ip6_hdr *);
537 hdrsplit = true;
538 }
539
540 /* Adjust mbuf packet header length. */
541 m->m_pkthdr.len += optlen;
542 plen = m->m_pkthdr.len - sizeof(*ip6);
543
544 if (plen > IPV6_MAXPACKET) {
545 error = EMSGSIZE;
546 goto freehdrs;
547 } else
548 ip6->ip6_plen = htons(plen);
549 nexthdrp = &ip6->ip6_nxt;
550
551 if (optlen) {
552 /*
553 * Concatenate headers and fill in next header fields.
554 * Here we have, on "m"
555 * IPv6 payload
556 * and we insert headers accordingly.
557 * Finally, we should be getting:
558 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload].
559 *
560 * During the header composing process "m" points to IPv6
561 * header. "mprev" points to an extension header prior to esp.
562 */
563 mprev = m;
564
565 /*
566 * We treat dest2 specially. This makes IPsec processing
567 * much easier. The goal here is to make mprev point the
568 * mbuf prior to dest2.
569 *
570 * Result: IPv6 dest2 payload.
571 * m and mprev will point to IPv6 header.
572 */
573 if (exthdrs.ip6e_dest2) {
574 if (!hdrsplit)
575 panic("%s:%d: assumption failed: "
576 "hdr not split: hdrsplit %d exthdrs %p",
577 __func__, __LINE__, hdrsplit, &exthdrs);
578 exthdrs.ip6e_dest2->m_next = m->m_next;
579 m->m_next = exthdrs.ip6e_dest2;
580 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
581 ip6->ip6_nxt = IPPROTO_DSTOPTS;
582 }
583
584 /*
585 * Result: IPv6 hbh dest1 rthdr dest2 payload.
586 * m will point to IPv6 header. mprev will point to the
587 * extension header prior to dest2 (rthdr in the above case).
588 */
589 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
590 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
591 IPPROTO_DSTOPTS);
592 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
593 IPPROTO_ROUTING);
594 }
595
596 IP6STAT_INC(ip6s_localout);
597
598 /* Route packet. */
599 ro_pmtu = ro;
600 if ((optvalid & IP6PO_VALID_RHINFO) != 0)
601 ro = &opt->ip6po_route;
602 if (ro != NULL)
603 dst = (struct sockaddr_in6 *)&ro->ro_dst;
604 else
605 dst = &sin6;
606 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
607
608 again:
609 /*
610 * If specified, try to fill in the traffic class field.
611 * Do not override if a non-zero value is already set.
612 * We check the diffserv field and the ECN field separately.
613 */
614 if ((optvalid & IP6PO_VALID_TC) != 0){
615 int mask = 0;
616
617 if (IPV6_DSCP(ip6) == 0)
618 mask |= 0xfc;
619 if (IPV6_ECN(ip6) == 0)
620 mask |= 0x03;
621 if (mask != 0)
622 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
623 }
624
625 /* Fill in or override the hop limit field, if necessary. */
626 if ((optvalid & IP6PO_VALID_HLIM) != 0)
627 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
628 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
629 if (im6o != NULL)
630 ip6->ip6_hlim = im6o->im6o_multicast_hlim;
631 else
632 ip6->ip6_hlim = V_ip6_defmcasthlim;
633 }
634
635 if (ro == NULL || ro->ro_nh == NULL) {
636 bzero(dst, sizeof(*dst));
637 dst->sin6_family = AF_INET6;
638 dst->sin6_len = sizeof(*dst);
639 dst->sin6_addr = ip6->ip6_dst;
640 }
641 /*
642 * Validate route against routing table changes.
643 * Make sure that the address family is set in route.
644 */
645 nh = NULL;
646 ifp = NULL;
647 mtu = 0;
648 if (ro != NULL) {
649 if (ro->ro_nh != NULL && inp != NULL) {
650 ro->ro_dst.sin6_family = AF_INET6; /* XXX KASSERT? */
651 NH_VALIDATE((struct route *)ro, &inp->inp_rt_cookie,
652 fibnum);
653 }
654 if (ro->ro_nh != NULL && fwd_tag == NULL &&
655 (!NH_IS_VALID(ro->ro_nh) ||
656 ro->ro_dst.sin6_family != AF_INET6 ||
657 !IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)))
658 RO_INVALIDATE_CACHE(ro);
659
660 if (ro->ro_nh != NULL && fwd_tag == NULL &&
661 ro->ro_dst.sin6_family == AF_INET6 &&
662 IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)) {
663 /* Nexthop is valid and contains valid ifp */
664 nh = ro->ro_nh;
665 } else {
666 if (ro->ro_lle)
667 LLE_FREE(ro->ro_lle); /* zeros ro_lle */
668 ro->ro_lle = NULL;
669 if (fwd_tag == NULL) {
670 bzero(&dst_sa, sizeof(dst_sa));
671 dst_sa.sin6_family = AF_INET6;
672 dst_sa.sin6_len = sizeof(dst_sa);
673 dst_sa.sin6_addr = ip6->ip6_dst;
674 }
675 error = in6_selectroute(&dst_sa, opt, im6o, ro, &ifp,
676 &nh, fibnum, m->m_pkthdr.flowid);
677 if (error != 0) {
678 IP6STAT_INC(ip6s_noroute);
679 if (ifp != NULL)
680 in6_ifstat_inc(ifp, ifs6_out_discard);
681 goto bad;
682 }
683 /*
684 * At this point at least @ifp is not NULL
685 * Can be the case when dst is multicast, link-local or
686 * interface is explicitly specificed by the caller.
687 */
688 }
689 if (nh == NULL) {
690 /*
691 * If in6_selectroute() does not return a nexthop
692 * dst may not have been updated.
693 */
694 *dst = dst_sa; /* XXX */
695 origifp = ifp;
696 mtu = ifp->if_mtu;
697 } else {
698 ifp = nh->nh_ifp;
699 origifp = nh->nh_aifp;
700 ia = (struct in6_ifaddr *)(nh->nh_ifa);
701 counter_u64_add(nh->nh_pksent, 1);
702 }
703 } else {
704 struct nhop_object *nh;
705 struct in6_addr kdst;
706 uint32_t scopeid;
707
708 if (fwd_tag == NULL) {
709 bzero(&dst_sa, sizeof(dst_sa));
710 dst_sa.sin6_family = AF_INET6;
711 dst_sa.sin6_len = sizeof(dst_sa);
712 dst_sa.sin6_addr = ip6->ip6_dst;
713 }
714
715 if (IN6_IS_ADDR_MULTICAST(&dst_sa.sin6_addr) &&
716 im6o != NULL &&
717 (ifp = im6o->im6o_multicast_ifp) != NULL) {
718 /* We do not need a route lookup. */
719 *dst = dst_sa; /* XXX */
720 origifp = ifp;
721 goto nonh6lookup;
722 }
723
724 in6_splitscope(&dst_sa.sin6_addr, &kdst, &scopeid);
725
726 if (IN6_IS_ADDR_MC_LINKLOCAL(&dst_sa.sin6_addr) ||
727 IN6_IS_ADDR_MC_NODELOCAL(&dst_sa.sin6_addr)) {
728 if (scopeid > 0) {
729 ifp = in6_getlinkifnet(scopeid);
730 if (ifp == NULL) {
731 error = EHOSTUNREACH;
732 goto bad;
733 }
734 *dst = dst_sa; /* XXX */
735 origifp = ifp;
736 goto nonh6lookup;
737 }
738 }
739
740 nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE,
741 m->m_pkthdr.flowid);
742 if (nh == NULL) {
743 IP6STAT_INC(ip6s_noroute);
744 /* No ifp in6_ifstat_inc(ifp, ifs6_out_discard); */
745 error = EHOSTUNREACH;
746 goto bad;
747 }
748
749 ifp = nh->nh_ifp;
750 origifp = nh->nh_aifp;
751 ia = ifatoia6(nh->nh_ifa);
752 if (nh->nh_flags & NHF_GATEWAY)
753 dst->sin6_addr = nh->gw6_sa.sin6_addr;
754 else if (fwd_tag != NULL)
755 dst->sin6_addr = dst_sa.sin6_addr;
756 nonh6lookup:
757 ;
758 }
759 /*
760 * At this point ifp MUST be pointing to the valid transmit ifp.
761 * origifp MUST be valid and pointing to either the same ifp or,
762 * in case of loopback output, to the interface which ip6_src
763 * belongs to.
764 * Examples:
765 * fe80::1%em0 -> fe80::2%em0 -> ifp=em0, origifp=em0
766 * fe80::1%em0 -> fe80::1%em0 -> ifp=lo0, origifp=em0
767 * ::1 -> ::1 -> ifp=lo0, origifp=lo0
768 *
769 * mtu can be 0 and will be refined later.
770 */
771 KASSERT((ifp != NULL), ("output interface must not be NULL"));
772 KASSERT((origifp != NULL), ("output address interface must not be NULL"));
773
774 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
775 /*
776 * IPSec checking which handles several cases.
777 * FAST IPSEC: We re-injected the packet.
778 * XXX: need scope argument.
779 */
780 if (IPSEC_ENABLED(ipv6)) {
781 if ((error = IPSEC_OUTPUT(ipv6, ifp, m, inp, mtu == 0 ?
782 ifp->if_mtu : mtu)) != 0) {
783 if (error == EINPROGRESS)
784 error = 0;
785 goto done;
786 }
787 }
788 #endif /* IPSEC */
789
790 if ((flags & IPV6_FORWARDING) == 0) {
791 /* XXX: the FORWARDING flag can be set for mrouting. */
792 in6_ifstat_inc(ifp, ifs6_out_request);
793 }
794
795 /* Setup data structures for scope ID checks. */
796 src0 = ip6->ip6_src;
797 bzero(&src_sa, sizeof(src_sa));
798 src_sa.sin6_family = AF_INET6;
799 src_sa.sin6_len = sizeof(src_sa);
800 src_sa.sin6_addr = ip6->ip6_src;
801
802 dst0 = ip6->ip6_dst;
803 /* Re-initialize to be sure. */
804 bzero(&dst_sa, sizeof(dst_sa));
805 dst_sa.sin6_family = AF_INET6;
806 dst_sa.sin6_len = sizeof(dst_sa);
807 dst_sa.sin6_addr = ip6->ip6_dst;
808
809 /* Check for valid scope ID. */
810 if (in6_setscope(&src0, origifp, &zone) == 0 &&
811 sa6_recoverscope(&src_sa) == 0 && zone == src_sa.sin6_scope_id &&
812 in6_setscope(&dst0, origifp, &zone) == 0 &&
813 sa6_recoverscope(&dst_sa) == 0 && zone == dst_sa.sin6_scope_id) {
814 /*
815 * The outgoing interface is in the zone of the source
816 * and destination addresses.
817 *
818 */
819 } else if ((origifp->if_flags & IFF_LOOPBACK) == 0 ||
820 sa6_recoverscope(&src_sa) != 0 ||
821 sa6_recoverscope(&dst_sa) != 0 ||
822 dst_sa.sin6_scope_id == 0 ||
823 (src_sa.sin6_scope_id != 0 &&
824 src_sa.sin6_scope_id != dst_sa.sin6_scope_id) ||
825 ifnet_byindex(dst_sa.sin6_scope_id) == NULL) {
826 /*
827 * If the destination network interface is not a
828 * loopback interface, or the destination network
829 * address has no scope ID, or the source address has
830 * a scope ID set which is different from the
831 * destination address one, or there is no network
832 * interface representing this scope ID, the address
833 * pair is considered invalid.
834 */
835 IP6STAT_INC(ip6s_badscope);
836 in6_ifstat_inc(origifp, ifs6_out_discard);
837 if (error == 0)
838 error = EHOSTUNREACH; /* XXX */
839 goto bad;
840 }
841 /* All scope ID checks are successful. */
842
843 if (nh && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
844 if ((optvalid & IP6PO_VALID_NHINFO) != 0) {
845 /*
846 * The nexthop is explicitly specified by the
847 * application. We assume the next hop is an IPv6
848 * address.
849 */
850 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
851 }
852 else if ((nh->nh_flags & NHF_GATEWAY))
853 dst = &nh->gw6_sa;
854 }
855
856 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
857 m->m_flags &= ~(M_BCAST | M_MCAST); /* Just in case. */
858 } else {
859 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
860 in6_ifstat_inc(ifp, ifs6_out_mcast);
861
862 /* Confirm that the outgoing interface supports multicast. */
863 if (!(ifp->if_flags & IFF_MULTICAST)) {
864 IP6STAT_INC(ip6s_noroute);
865 in6_ifstat_inc(ifp, ifs6_out_discard);
866 error = ENETUNREACH;
867 goto bad;
868 }
869 if ((im6o == NULL && in6_mcast_loop) ||
870 (im6o && im6o->im6o_multicast_loop)) {
871 /*
872 * Loop back multicast datagram if not expressly
873 * forbidden to do so, even if we have not joined
874 * the address; protocols will filter it later,
875 * thus deferring a hash lookup and lock acquisition
876 * at the expense of an m_copym().
877 */
878 ip6_mloopback(ifp, m);
879 } else {
880 /*
881 * If we are acting as a multicast router, perform
882 * multicast forwarding as if the packet had just
883 * arrived on the interface to which we are about
884 * to send. The multicast forwarding function
885 * recursively calls this function, using the
886 * IPV6_FORWARDING flag to prevent infinite recursion.
887 *
888 * Multicasts that are looped back by ip6_mloopback(),
889 * above, will be forwarded by the ip6_input() routine,
890 * if necessary.
891 */
892 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
893 /*
894 * XXX: ip6_mforward expects that rcvif is NULL
895 * when it is called from the originating path.
896 * However, it may not always be the case.
897 */
898 m->m_pkthdr.rcvif = NULL;
899 if (ip6_mforward(ip6, ifp, m) != 0) {
900 m_freem(m);
901 goto done;
902 }
903 }
904 }
905 /*
906 * Multicasts with a hoplimit of zero may be looped back,
907 * above, but must not be transmitted on a network.
908 * Also, multicasts addressed to the loopback interface
909 * are not sent -- the above call to ip6_mloopback() will
910 * loop back a copy if this host actually belongs to the
911 * destination group on the loopback interface.
912 */
913 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
914 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
915 m_freem(m);
916 goto done;
917 }
918 }
919
920 /*
921 * Fill the outgoing inteface to tell the upper layer
922 * to increment per-interface statistics.
923 */
924 if (ifpp)
925 *ifpp = ifp;
926
927 /* Determine path MTU. */
928 ip6_getpmtu(ro_pmtu, ro != ro_pmtu, ifp, &ip6->ip6_dst, &mtu, fibnum,
929 *nexthdrp);
930 KASSERT(mtu > 0, ("%s:%d: mtu %ld, ro_pmtu %p ro %p ifp %p fibnum %u",
931 __func__, __LINE__, mtu, ro_pmtu, ro, ifp, fibnum));
932
933 /*
934 * The caller of this function may specify to use the minimum MTU
935 * in some cases.
936 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
937 * setting. The logic is a bit complicated; by default, unicast
938 * packets will follow path MTU while multicast packets will be sent at
939 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
940 * including unicast ones will be sent at the minimum MTU. Multicast
941 * packets will always be sent at the minimum MTU unless
942 * IP6PO_MINMTU_DISABLE is explicitly specified.
943 * See RFC 3542 for more details.
944 */
945 if (mtu > IPV6_MMTU) {
946 if ((flags & IPV6_MINMTU))
947 mtu = IPV6_MMTU;
948 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
949 mtu = IPV6_MMTU;
950 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
951 (opt == NULL ||
952 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
953 mtu = IPV6_MMTU;
954 }
955 }
956
957 /*
958 * Clear embedded scope identifiers if necessary.
959 * in6_clearscope() will touch the addresses only when necessary.
960 */
961 in6_clearscope(&ip6->ip6_src);
962 in6_clearscope(&ip6->ip6_dst);
963
964 /*
965 * If the outgoing packet contains a hop-by-hop options header,
966 * it must be examined and processed even by the source node.
967 * (RFC 2460, section 4.)
968 */
969 if (exthdrs.ip6e_hbh) {
970 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
971 u_int32_t dummy; /* XXX unused */
972
973 #ifdef DIAGNOSTIC
974 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
975 panic("ip6e_hbh is not contiguous");
976 #endif
977 /*
978 * XXX: if we have to send an ICMPv6 error to the sender,
979 * we need the M_LOOP flag since icmp6_error() expects
980 * the IPv6 and the hop-by-hop options header are
981 * contiguous unless the flag is set.
982 */
983 m->m_flags |= M_LOOP;
984 m->m_pkthdr.rcvif = ifp;
985 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
986 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
987 &dummy) < 0) {
988 /* m was already freed at this point. */
989 error = EINVAL;/* better error? */
990 goto done;
991 }
992 m->m_flags &= ~M_LOOP; /* XXX */
993 m->m_pkthdr.rcvif = NULL;
994 }
995
996 /* Jump over all PFIL processing if hooks are not active. */
997 if (!PFIL_HOOKED_OUT(V_inet6_pfil_head))
998 goto passout;
999
1000 odst = ip6->ip6_dst;
1001 /* Run through list of hooks for output packets. */
1002 switch (pfil_mbuf_out(V_inet6_pfil_head, &m, ifp, inp)) {
1003 case PFIL_PASS:
1004 ip6 = mtod(m, struct ip6_hdr *);
1005 break;
1006 case PFIL_DROPPED:
1007 error = EACCES;
1008 /* FALLTHROUGH */
1009 case PFIL_CONSUMED:
1010 goto done;
1011 }
1012
1013 needfiblookup = 0;
1014 /* See if destination IP address was changed by packet filter. */
1015 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
1016 m->m_flags |= M_SKIP_FIREWALL;
1017 /* If destination is now ourself drop to ip6_input(). */
1018 if (in6_localip(&ip6->ip6_dst)) {
1019 m->m_flags |= M_FASTFWD_OURS;
1020 if (m->m_pkthdr.rcvif == NULL)
1021 m->m_pkthdr.rcvif = V_loif;
1022 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1023 m->m_pkthdr.csum_flags |=
1024 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
1025 m->m_pkthdr.csum_data = 0xffff;
1026 }
1027 #if defined(SCTP) || defined(SCTP_SUPPORT)
1028 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
1029 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
1030 #endif
1031 error = netisr_queue(NETISR_IPV6, m);
1032 goto done;
1033 } else {
1034 if (ro != NULL)
1035 RO_INVALIDATE_CACHE(ro);
1036 needfiblookup = 1; /* Redo the routing table lookup. */
1037 }
1038 }
1039 /* See if fib was changed by packet filter. */
1040 if (fibnum != M_GETFIB(m)) {
1041 m->m_flags |= M_SKIP_FIREWALL;
1042 fibnum = M_GETFIB(m);
1043 if (ro != NULL)
1044 RO_INVALIDATE_CACHE(ro);
1045 needfiblookup = 1;
1046 }
1047 if (needfiblookup)
1048 goto again;
1049
1050 /* See if local, if yes, send it to netisr. */
1051 if (m->m_flags & M_FASTFWD_OURS) {
1052 if (m->m_pkthdr.rcvif == NULL)
1053 m->m_pkthdr.rcvif = V_loif;
1054 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1055 m->m_pkthdr.csum_flags |=
1056 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
1057 m->m_pkthdr.csum_data = 0xffff;
1058 }
1059 #if defined(SCTP) || defined(SCTP_SUPPORT)
1060 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
1061 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
1062 #endif
1063 error = netisr_queue(NETISR_IPV6, m);
1064 goto done;
1065 }
1066 /* Or forward to some other address? */
1067 if ((m->m_flags & M_IP6_NEXTHOP) &&
1068 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
1069 if (ro != NULL)
1070 dst = (struct sockaddr_in6 *)&ro->ro_dst;
1071 else
1072 dst = &sin6;
1073 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
1074 m->m_flags |= M_SKIP_FIREWALL;
1075 m->m_flags &= ~M_IP6_NEXTHOP;
1076 m_tag_delete(m, fwd_tag);
1077 goto again;
1078 }
1079
1080 passout:
1081 if (vlan_pcp > -1)
1082 EVL_APPLY_PRI(m, vlan_pcp);
1083
1084 /* Ensure the packet data is mapped if the interface requires it. */
1085 if ((ifp->if_capenable & IFCAP_MEXTPG) == 0) {
1086 struct mbuf *m1;
1087
1088 error = mb_unmapped_to_ext(m, &m1);
1089 if (error != 0) {
1090 if (error == EINVAL) {
1091 if_printf(ifp, "TLS packet\n");
1092 /* XXXKIB */
1093 } else if (error == ENOMEM) {
1094 error = ENOBUFS;
1095 }
1096 IP6STAT_INC(ip6s_odropped);
1097 return (error);
1098 } else {
1099 m = m1;
1100 }
1101 }
1102
1103 /*
1104 * Send the packet to the outgoing interface.
1105 * If necessary, do IPv6 fragmentation before sending.
1106 *
1107 * 1: normal case (dontfrag == 0)
1108 * 1-a: send as is if tlen <= path mtu
1109 * 1-b: fragment if tlen > path mtu
1110 *
1111 * 2: if user asks us not to fragment (dontfrag == 1)
1112 * 2-a: send as is if tlen <= interface mtu
1113 * 2-b: error if tlen > interface mtu
1114 */
1115 sw_csum = m->m_pkthdr.csum_flags;
1116 if (!hdrsplit) {
1117 tso = ((sw_csum & ifp->if_hwassist &
1118 (CSUM_TSO | CSUM_INNER_TSO)) != 0) ? 1 : 0;
1119 sw_csum &= ~ifp->if_hwassist;
1120 } else
1121 tso = 0;
1122 /*
1123 * If we added extension headers, we will not do TSO and calculate the
1124 * checksums ourselves for now.
1125 * XXX-BZ Need a framework to know when the NIC can handle it, even
1126 * with ext. hdrs.
1127 */
1128 ip6_output_delayed_csum(m, ifp, sw_csum, plen, optlen);
1129 /* XXX-BZ m->m_pkthdr.csum_flags &= ~ifp->if_hwassist; */
1130 tlen = m->m_pkthdr.len;
1131
1132 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
1133 dontfrag = 1;
1134 else
1135 dontfrag = 0;
1136 if (dontfrag && tlen > in6_ifmtu(ifp) && !tso) { /* Case 2-b. */
1137 /*
1138 * If the DONTFRAG option is specified, we cannot send the
1139 * packet when the data length is larger than the MTU of the
1140 * outgoing interface.
1141 * Notify the error by sending IPV6_PATHMTU ancillary data if
1142 * application wanted to know the MTU value. Also return an
1143 * error code (this is not described in the API spec).
1144 */
1145 if (inp != NULL)
1146 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu);
1147 error = EMSGSIZE;
1148 goto bad;
1149 }
1150
1151 /* Transmit packet without fragmentation. */
1152 if (dontfrag || tlen <= mtu) { /* Cases 1-a and 2-a. */
1153 struct in6_ifaddr *ia6;
1154
1155 ip6 = mtod(m, struct ip6_hdr *);
1156 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
1157 if (ia6) {
1158 /* Record statistics for this interface address. */
1159 counter_u64_add(ia6->ia_ifa.ifa_opackets, 1);
1160 counter_u64_add(ia6->ia_ifa.ifa_obytes,
1161 m->m_pkthdr.len);
1162 }
1163 error = ip6_output_send(inp, ifp, origifp, m, dst, ro,
1164 (flags & IP_NO_SND_TAG_RL) ? false : true);
1165 goto done;
1166 }
1167
1168 /* Try to fragment the packet. Case 1-b. */
1169 if (mtu < IPV6_MMTU) {
1170 /* Path MTU cannot be less than IPV6_MMTU. */
1171 error = EMSGSIZE;
1172 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1173 goto bad;
1174 } else if (ip6->ip6_plen == 0) {
1175 /* We do not support jumbo payload. */
1176 error = EMSGSIZE;
1177 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1178 goto bad;
1179 } else {
1180 u_char nextproto;
1181
1182 /*
1183 * Too large for the destination or interface;
1184 * fragment if possible.
1185 * Must be able to put at least 8 bytes per fragment.
1186 */
1187 if (mtu > IPV6_MAXPACKET)
1188 mtu = IPV6_MAXPACKET;
1189
1190 len = (mtu - unfragpartlen - sizeof(struct ip6_frag)) & ~7;
1191 if (len < 8) {
1192 error = EMSGSIZE;
1193 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1194 goto bad;
1195 }
1196
1197 /*
1198 * If the interface will not calculate checksums on
1199 * fragmented packets, then do it here.
1200 * XXX-BZ handle the hw offloading case. Need flags.
1201 */
1202 ip6_output_delayed_csum(m, ifp, m->m_pkthdr.csum_flags, plen,
1203 optlen);
1204
1205 /*
1206 * Change the next header field of the last header in the
1207 * unfragmentable part.
1208 */
1209 if (exthdrs.ip6e_rthdr) {
1210 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
1211 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
1212 } else if (exthdrs.ip6e_dest1) {
1213 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
1214 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
1215 } else if (exthdrs.ip6e_hbh) {
1216 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
1217 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
1218 } else {
1219 ip6 = mtod(m, struct ip6_hdr *);
1220 nextproto = ip6->ip6_nxt;
1221 ip6->ip6_nxt = IPPROTO_FRAGMENT;
1222 }
1223
1224 /*
1225 * Loop through length of segment after first fragment,
1226 * make new header and copy data of each part and link onto
1227 * chain.
1228 */
1229 m0 = m;
1230 id = htonl(ip6_randomid());
1231 error = ip6_fragment(ifp, m, unfragpartlen, nextproto,len, id);
1232 if (error != 0)
1233 goto sendorfree;
1234
1235 in6_ifstat_inc(ifp, ifs6_out_fragok);
1236 }
1237
1238 /* Remove leading garbage. */
1239 sendorfree:
1240 m = m0->m_nextpkt;
1241 m0->m_nextpkt = 0;
1242 m_freem(m0);
1243 for (; m; m = m0) {
1244 m0 = m->m_nextpkt;
1245 m->m_nextpkt = 0;
1246 if (error == 0) {
1247 /* Record statistics for this interface address. */
1248 if (ia) {
1249 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
1250 counter_u64_add(ia->ia_ifa.ifa_obytes,
1251 m->m_pkthdr.len);
1252 }
1253 if (vlan_pcp > -1)
1254 EVL_APPLY_PRI(m, vlan_pcp);
1255 error = ip6_output_send(inp, ifp, origifp, m, dst, ro,
1256 true);
1257 } else
1258 m_freem(m);
1259 }
1260
1261 if (error == 0)
1262 IP6STAT_INC(ip6s_fragmented);
1263
1264 done:
1265 return (error);
1266
1267 freehdrs:
1268 m_freem(exthdrs.ip6e_hbh); /* m_freem() checks if mbuf is NULL. */
1269 m_freem(exthdrs.ip6e_dest1);
1270 m_freem(exthdrs.ip6e_rthdr);
1271 m_freem(exthdrs.ip6e_dest2);
1272 /* FALLTHROUGH */
1273 bad:
1274 if (m)
1275 m_freem(m);
1276 goto done;
1277 }
1278
1279 static int
ip6_copyexthdr(struct mbuf ** mp,caddr_t hdr,int hlen)1280 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1281 {
1282 struct mbuf *m;
1283
1284 if (hlen > MCLBYTES)
1285 return (ENOBUFS); /* XXX */
1286
1287 if (hlen > MLEN)
1288 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1289 else
1290 m = m_get(M_NOWAIT, MT_DATA);
1291 if (m == NULL)
1292 return (ENOBUFS);
1293 m->m_len = hlen;
1294 if (hdr)
1295 bcopy(hdr, mtod(m, caddr_t), hlen);
1296
1297 *mp = m;
1298 return (0);
1299 }
1300
1301 /*
1302 * Insert fragment header and copy unfragmentable header portions.
1303 */
1304 static int
ip6_insertfraghdr(struct mbuf * m0,struct mbuf * m,int hlen,struct ip6_frag ** frghdrp)1305 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1306 struct ip6_frag **frghdrp)
1307 {
1308 struct mbuf *n, *mlast;
1309
1310 if (hlen > sizeof(struct ip6_hdr)) {
1311 n = m_copym(m0, sizeof(struct ip6_hdr),
1312 hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1313 if (n == NULL)
1314 return (ENOBUFS);
1315 m->m_next = n;
1316 } else
1317 n = m;
1318
1319 /* Search for the last mbuf of unfragmentable part. */
1320 for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1321 ;
1322
1323 if (M_WRITABLE(mlast) &&
1324 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1325 /* use the trailing space of the last mbuf for the fragment hdr */
1326 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1327 mlast->m_len);
1328 mlast->m_len += sizeof(struct ip6_frag);
1329 m->m_pkthdr.len += sizeof(struct ip6_frag);
1330 } else {
1331 /* allocate a new mbuf for the fragment header */
1332 struct mbuf *mfrg;
1333
1334 mfrg = m_get(M_NOWAIT, MT_DATA);
1335 if (mfrg == NULL)
1336 return (ENOBUFS);
1337 mfrg->m_len = sizeof(struct ip6_frag);
1338 *frghdrp = mtod(mfrg, struct ip6_frag *);
1339 mlast->m_next = mfrg;
1340 }
1341
1342 return (0);
1343 }
1344
1345 /*
1346 * Calculates IPv6 path mtu for destination @dst.
1347 * Resulting MTU is stored in @mtup.
1348 *
1349 * Returns 0 on success.
1350 */
1351 static int
ip6_getpmtu_ctl(u_int fibnum,const struct in6_addr * dst,u_long * mtup)1352 ip6_getpmtu_ctl(u_int fibnum, const struct in6_addr *dst, u_long *mtup)
1353 {
1354 struct epoch_tracker et;
1355 struct nhop_object *nh;
1356 struct in6_addr kdst;
1357 uint32_t scopeid;
1358 int error;
1359
1360 in6_splitscope(dst, &kdst, &scopeid);
1361
1362 NET_EPOCH_ENTER(et);
1363 nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0);
1364 if (nh != NULL) {
1365 ip6_calcmtu(nh->nh_ifp, dst, nh->nh_mtu, mtup, 0);
1366 error = 0;
1367 } else
1368 error = EHOSTUNREACH;
1369 NET_EPOCH_EXIT(et);
1370
1371 return (error);
1372 }
1373
1374 /*
1375 * Calculates IPv6 path MTU for @dst based on transmit @ifp,
1376 * and cached data in @ro_pmtu.
1377 * MTU from (successful) route lookup is saved (along with dst)
1378 * inside @ro_pmtu to avoid subsequent route lookups after packet
1379 * filter processing.
1380 *
1381 * Stores mtu into @mtup.
1382 */
1383 static void
ip6_getpmtu(struct route_in6 * ro_pmtu,int do_lookup,struct ifnet * ifp,const struct in6_addr * dst,u_long * mtup,u_int fibnum,u_int proto)1384 ip6_getpmtu(struct route_in6 *ro_pmtu, int do_lookup,
1385 struct ifnet *ifp, const struct in6_addr *dst, u_long *mtup,
1386 u_int fibnum, u_int proto)
1387 {
1388 struct nhop_object *nh;
1389 struct in6_addr kdst;
1390 uint32_t scopeid;
1391 struct sockaddr_in6 *sa6_dst, sin6;
1392 u_long mtu;
1393
1394 NET_EPOCH_ASSERT();
1395
1396 mtu = 0;
1397 if (ro_pmtu == NULL || do_lookup) {
1398 /*
1399 * Here ro_pmtu has final destination address, while
1400 * ro might represent immediate destination.
1401 * Use ro_pmtu destination since mtu might differ.
1402 */
1403 if (ro_pmtu != NULL) {
1404 sa6_dst = (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1405 if (!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))
1406 ro_pmtu->ro_mtu = 0;
1407 } else
1408 sa6_dst = &sin6;
1409
1410 if (ro_pmtu == NULL || ro_pmtu->ro_mtu == 0) {
1411 bzero(sa6_dst, sizeof(*sa6_dst));
1412 sa6_dst->sin6_family = AF_INET6;
1413 sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1414 sa6_dst->sin6_addr = *dst;
1415
1416 in6_splitscope(dst, &kdst, &scopeid);
1417 nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0);
1418 if (nh != NULL) {
1419 mtu = nh->nh_mtu;
1420 if (ro_pmtu != NULL)
1421 ro_pmtu->ro_mtu = mtu;
1422 }
1423 } else
1424 mtu = ro_pmtu->ro_mtu;
1425 }
1426
1427 if (ro_pmtu != NULL && ro_pmtu->ro_nh != NULL)
1428 mtu = ro_pmtu->ro_nh->nh_mtu;
1429
1430 ip6_calcmtu(ifp, dst, mtu, mtup, proto);
1431 }
1432
1433 /*
1434 * Calculate MTU based on transmit @ifp, route mtu @rt_mtu and
1435 * hostcache data for @dst.
1436 * Stores mtu into @mtup.
1437 */
1438 static void
ip6_calcmtu(struct ifnet * ifp,const struct in6_addr * dst,u_long rt_mtu,u_long * mtup,u_int proto)1439 ip6_calcmtu(struct ifnet *ifp, const struct in6_addr *dst, u_long rt_mtu,
1440 u_long *mtup, u_int proto)
1441 {
1442 u_long mtu = 0;
1443
1444 if (rt_mtu > 0) {
1445 /* Skip the hostcache if the protocol handles PMTU changes. */
1446 if (proto != IPPROTO_TCP && proto != IPPROTO_SCTP) {
1447 struct in_conninfo inc = {
1448 .inc_flags = INC_ISIPV6,
1449 .inc6_faddr = *dst,
1450 };
1451
1452 mtu = tcp_hc_getmtu(&inc);
1453 }
1454
1455 if (mtu)
1456 mtu = min(mtu, rt_mtu);
1457 else
1458 mtu = rt_mtu;
1459 }
1460
1461 if (mtu == 0)
1462 mtu = in6_ifmtu(ifp);
1463
1464 *mtup = mtu;
1465 }
1466
1467 /*
1468 * IP6 socket option processing.
1469 */
1470 int
ip6_ctloutput(struct socket * so,struct sockopt * sopt)1471 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1472 {
1473 int optdatalen, uproto;
1474 void *optdata;
1475 struct inpcb *inp = sotoinpcb(so);
1476 int error, optval;
1477 int level, op, optname;
1478 int optlen;
1479 struct thread *td;
1480 #ifdef RSS
1481 uint32_t rss_bucket;
1482 int retval;
1483 #endif
1484
1485 /*
1486 * Don't use more than a quarter of mbuf clusters. N.B.:
1487 * nmbclusters is an int, but nmbclusters * MCLBYTES may overflow
1488 * on LP64 architectures, so cast to u_long to avoid undefined
1489 * behavior. ILP32 architectures cannot have nmbclusters
1490 * large enough to overflow for other reasons.
1491 */
1492 #define IPV6_PKTOPTIONS_MBUF_LIMIT ((u_long)nmbclusters * MCLBYTES / 4)
1493
1494 level = sopt->sopt_level;
1495 op = sopt->sopt_dir;
1496 optname = sopt->sopt_name;
1497 optlen = sopt->sopt_valsize;
1498 td = sopt->sopt_td;
1499 error = 0;
1500 optval = 0;
1501 uproto = (int)so->so_proto->pr_protocol;
1502
1503 if (level != IPPROTO_IPV6) {
1504 error = EINVAL;
1505
1506 if (sopt->sopt_level == SOL_SOCKET &&
1507 sopt->sopt_dir == SOPT_SET) {
1508 switch (sopt->sopt_name) {
1509 case SO_SETFIB:
1510 error = sooptcopyin(sopt, &optval,
1511 sizeof(optval), sizeof(optval));
1512 if (error != 0)
1513 break;
1514
1515 INP_WLOCK(inp);
1516 if ((inp->inp_flags & INP_BOUNDFIB) != 0 &&
1517 optval != so->so_fibnum) {
1518 INP_WUNLOCK(inp);
1519 error = EISCONN;
1520 break;
1521 }
1522 error = sosetfib(inp->inp_socket, optval);
1523 if (error == 0)
1524 inp->inp_inc.inc_fibnum = optval;
1525 INP_WUNLOCK(inp);
1526 break;
1527 case SO_MAX_PACING_RATE:
1528 #ifdef RATELIMIT
1529 INP_WLOCK(inp);
1530 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1531 INP_WUNLOCK(inp);
1532 error = 0;
1533 #else
1534 error = EOPNOTSUPP;
1535 #endif
1536 break;
1537 default:
1538 break;
1539 }
1540 }
1541 } else { /* level == IPPROTO_IPV6 */
1542 switch (op) {
1543 case SOPT_SET:
1544 switch (optname) {
1545 case IPV6_2292PKTOPTIONS:
1546 #ifdef IPV6_PKTOPTIONS
1547 case IPV6_PKTOPTIONS:
1548 #endif
1549 {
1550 struct mbuf *m;
1551
1552 if (optlen > IPV6_PKTOPTIONS_MBUF_LIMIT) {
1553 printf("ip6_ctloutput: mbuf limit hit\n");
1554 error = ENOBUFS;
1555 break;
1556 }
1557
1558 error = soopt_getm(sopt, &m); /* XXX */
1559 if (error != 0)
1560 break;
1561 error = soopt_mcopyin(sopt, m); /* XXX */
1562 if (error != 0)
1563 break;
1564 INP_WLOCK(inp);
1565 error = ip6_pcbopts(&inp->in6p_outputopts, m,
1566 so, sopt);
1567 INP_WUNLOCK(inp);
1568 m_freem(m); /* XXX */
1569 break;
1570 }
1571
1572 /*
1573 * Use of some Hop-by-Hop options or some
1574 * Destination options, might require special
1575 * privilege. That is, normal applications
1576 * (without special privilege) might be forbidden
1577 * from setting certain options in outgoing packets,
1578 * and might never see certain options in received
1579 * packets. [RFC 2292 Section 6]
1580 * KAME specific note:
1581 * KAME prevents non-privileged users from sending or
1582 * receiving ANY hbh/dst options in order to avoid
1583 * overhead of parsing options in the kernel.
1584 */
1585 case IPV6_RECVHOPOPTS:
1586 case IPV6_RECVDSTOPTS:
1587 case IPV6_RECVRTHDRDSTOPTS:
1588 if (td != NULL) {
1589 error = priv_check(td,
1590 PRIV_NETINET_SETHDROPTS);
1591 if (error)
1592 break;
1593 }
1594 /* FALLTHROUGH */
1595 case IPV6_UNICAST_HOPS:
1596 case IPV6_HOPLIMIT:
1597
1598 case IPV6_RECVPKTINFO:
1599 case IPV6_RECVHOPLIMIT:
1600 case IPV6_RECVRTHDR:
1601 case IPV6_RECVPATHMTU:
1602 case IPV6_RECVTCLASS:
1603 case IPV6_RECVFLOWID:
1604 #ifdef RSS
1605 case IPV6_RECVRSSBUCKETID:
1606 #endif
1607 case IPV6_V6ONLY:
1608 case IPV6_AUTOFLOWLABEL:
1609 case IPV6_ORIGDSTADDR:
1610 case IPV6_BINDANY:
1611 case IPV6_VLAN_PCP:
1612 if (optname == IPV6_BINDANY && td != NULL) {
1613 error = priv_check(td,
1614 PRIV_NETINET_BINDANY);
1615 if (error)
1616 break;
1617 }
1618
1619 if (optlen != sizeof(int)) {
1620 error = EINVAL;
1621 break;
1622 }
1623 error = sooptcopyin(sopt, &optval,
1624 sizeof optval, sizeof optval);
1625 if (error)
1626 break;
1627 switch (optname) {
1628 case IPV6_UNICAST_HOPS:
1629 if (optval < -1 || optval >= 256)
1630 error = EINVAL;
1631 else {
1632 /* -1 = kernel default */
1633 inp->in6p_hops = optval;
1634 if ((inp->inp_vflag &
1635 INP_IPV4) != 0)
1636 inp->inp_ip_ttl = optval;
1637 }
1638 break;
1639 #define OPTSET(bit) \
1640 do { \
1641 INP_WLOCK(inp); \
1642 if (optval) \
1643 inp->inp_flags |= (bit); \
1644 else \
1645 inp->inp_flags &= ~(bit); \
1646 INP_WUNLOCK(inp); \
1647 } while (/*CONSTCOND*/ 0)
1648 #define OPTSET2292(bit) \
1649 do { \
1650 INP_WLOCK(inp); \
1651 inp->inp_flags |= IN6P_RFC2292; \
1652 if (optval) \
1653 inp->inp_flags |= (bit); \
1654 else \
1655 inp->inp_flags &= ~(bit); \
1656 INP_WUNLOCK(inp); \
1657 } while (/*CONSTCOND*/ 0)
1658 #define OPTBIT(bit) (inp->inp_flags & (bit) ? 1 : 0)
1659
1660 #define OPTSET2_N(bit, val) do { \
1661 if (val) \
1662 inp->inp_flags2 |= bit; \
1663 else \
1664 inp->inp_flags2 &= ~bit; \
1665 } while (0)
1666 #define OPTSET2(bit, val) do { \
1667 INP_WLOCK(inp); \
1668 OPTSET2_N(bit, val); \
1669 INP_WUNLOCK(inp); \
1670 } while (0)
1671 #define OPTBIT2(bit) (inp->inp_flags2 & (bit) ? 1 : 0)
1672 #define OPTSET2292_EXCLUSIVE(bit) \
1673 do { \
1674 INP_WLOCK(inp); \
1675 if (OPTBIT(IN6P_RFC2292)) { \
1676 error = EINVAL; \
1677 } else { \
1678 if (optval) \
1679 inp->inp_flags |= (bit); \
1680 else \
1681 inp->inp_flags &= ~(bit); \
1682 } \
1683 INP_WUNLOCK(inp); \
1684 } while (/*CONSTCOND*/ 0)
1685
1686 case IPV6_RECVPKTINFO:
1687 OPTSET2292_EXCLUSIVE(IN6P_PKTINFO);
1688 break;
1689
1690 case IPV6_HOPLIMIT:
1691 {
1692 struct ip6_pktopts **optp;
1693
1694 /* cannot mix with RFC2292 */
1695 if (OPTBIT(IN6P_RFC2292)) {
1696 error = EINVAL;
1697 break;
1698 }
1699 INP_WLOCK(inp);
1700 if (inp->inp_flags & INP_DROPPED) {
1701 INP_WUNLOCK(inp);
1702 return (ECONNRESET);
1703 }
1704 optp = &inp->in6p_outputopts;
1705 error = ip6_pcbopt(IPV6_HOPLIMIT,
1706 (u_char *)&optval, sizeof(optval),
1707 optp, (td != NULL) ? td->td_ucred :
1708 NULL, uproto);
1709 INP_WUNLOCK(inp);
1710 break;
1711 }
1712
1713 case IPV6_RECVHOPLIMIT:
1714 OPTSET2292_EXCLUSIVE(IN6P_HOPLIMIT);
1715 break;
1716
1717 case IPV6_RECVHOPOPTS:
1718 OPTSET2292_EXCLUSIVE(IN6P_HOPOPTS);
1719 break;
1720
1721 case IPV6_RECVDSTOPTS:
1722 OPTSET2292_EXCLUSIVE(IN6P_DSTOPTS);
1723 break;
1724
1725 case IPV6_RECVRTHDRDSTOPTS:
1726 OPTSET2292_EXCLUSIVE(IN6P_RTHDRDSTOPTS);
1727 break;
1728
1729 case IPV6_RECVRTHDR:
1730 OPTSET2292_EXCLUSIVE(IN6P_RTHDR);
1731 break;
1732
1733 case IPV6_RECVPATHMTU:
1734 /*
1735 * We ignore this option for TCP
1736 * sockets.
1737 * (RFC3542 leaves this case
1738 * unspecified.)
1739 */
1740 if (uproto != IPPROTO_TCP)
1741 OPTSET(IN6P_MTU);
1742 break;
1743
1744 case IPV6_RECVFLOWID:
1745 OPTSET2(INP_RECVFLOWID, optval);
1746 break;
1747
1748 #ifdef RSS
1749 case IPV6_RECVRSSBUCKETID:
1750 OPTSET2(INP_RECVRSSBUCKETID, optval);
1751 break;
1752 #endif
1753
1754 case IPV6_V6ONLY:
1755 INP_WLOCK(inp);
1756 if (inp->inp_lport ||
1757 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1758 /*
1759 * The socket is already bound.
1760 */
1761 INP_WUNLOCK(inp);
1762 error = EINVAL;
1763 break;
1764 }
1765 if (optval) {
1766 inp->inp_flags |= IN6P_IPV6_V6ONLY;
1767 inp->inp_vflag &= ~INP_IPV4;
1768 } else {
1769 inp->inp_flags &= ~IN6P_IPV6_V6ONLY;
1770 inp->inp_vflag |= INP_IPV4;
1771 }
1772 INP_WUNLOCK(inp);
1773 break;
1774 case IPV6_RECVTCLASS:
1775 /* cannot mix with RFC2292 XXX */
1776 OPTSET2292_EXCLUSIVE(IN6P_TCLASS);
1777 break;
1778 case IPV6_AUTOFLOWLABEL:
1779 OPTSET(IN6P_AUTOFLOWLABEL);
1780 break;
1781
1782 case IPV6_ORIGDSTADDR:
1783 OPTSET2(INP_ORIGDSTADDR, optval);
1784 break;
1785 case IPV6_BINDANY:
1786 OPTSET(INP_BINDANY);
1787 break;
1788 case IPV6_VLAN_PCP:
1789 if ((optval >= -1) && (optval <=
1790 (INP_2PCP_MASK >> INP_2PCP_SHIFT))) {
1791 if (optval == -1) {
1792 INP_WLOCK(inp);
1793 inp->inp_flags2 &=
1794 ~(INP_2PCP_SET |
1795 INP_2PCP_MASK);
1796 INP_WUNLOCK(inp);
1797 } else {
1798 INP_WLOCK(inp);
1799 inp->inp_flags2 |=
1800 INP_2PCP_SET;
1801 inp->inp_flags2 &=
1802 ~INP_2PCP_MASK;
1803 inp->inp_flags2 |=
1804 optval <<
1805 INP_2PCP_SHIFT;
1806 INP_WUNLOCK(inp);
1807 }
1808 } else
1809 error = EINVAL;
1810 break;
1811 }
1812 break;
1813
1814 case IPV6_TCLASS:
1815 case IPV6_DONTFRAG:
1816 case IPV6_USE_MIN_MTU:
1817 case IPV6_PREFER_TEMPADDR:
1818 if (optlen != sizeof(optval)) {
1819 error = EINVAL;
1820 break;
1821 }
1822 error = sooptcopyin(sopt, &optval,
1823 sizeof optval, sizeof optval);
1824 if (error)
1825 break;
1826 {
1827 struct ip6_pktopts **optp;
1828 INP_WLOCK(inp);
1829 if (inp->inp_flags & INP_DROPPED) {
1830 INP_WUNLOCK(inp);
1831 return (ECONNRESET);
1832 }
1833 optp = &inp->in6p_outputopts;
1834 error = ip6_pcbopt(optname,
1835 (u_char *)&optval, sizeof(optval),
1836 optp, (td != NULL) ? td->td_ucred :
1837 NULL, uproto);
1838 INP_WUNLOCK(inp);
1839 break;
1840 }
1841
1842 case IPV6_2292PKTINFO:
1843 case IPV6_2292HOPLIMIT:
1844 case IPV6_2292HOPOPTS:
1845 case IPV6_2292DSTOPTS:
1846 case IPV6_2292RTHDR:
1847 /* RFC 2292 */
1848 if (optlen != sizeof(int)) {
1849 error = EINVAL;
1850 break;
1851 }
1852 error = sooptcopyin(sopt, &optval,
1853 sizeof optval, sizeof optval);
1854 if (error)
1855 break;
1856 switch (optname) {
1857 case IPV6_2292PKTINFO:
1858 OPTSET2292(IN6P_PKTINFO);
1859 break;
1860 case IPV6_2292HOPLIMIT:
1861 OPTSET2292(IN6P_HOPLIMIT);
1862 break;
1863 case IPV6_2292HOPOPTS:
1864 /*
1865 * Check super-user privilege.
1866 * See comments for IPV6_RECVHOPOPTS.
1867 */
1868 if (td != NULL) {
1869 error = priv_check(td,
1870 PRIV_NETINET_SETHDROPTS);
1871 if (error)
1872 return (error);
1873 }
1874 OPTSET2292(IN6P_HOPOPTS);
1875 break;
1876 case IPV6_2292DSTOPTS:
1877 if (td != NULL) {
1878 error = priv_check(td,
1879 PRIV_NETINET_SETHDROPTS);
1880 if (error)
1881 return (error);
1882 }
1883 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1884 break;
1885 case IPV6_2292RTHDR:
1886 OPTSET2292(IN6P_RTHDR);
1887 break;
1888 }
1889 break;
1890 case IPV6_PKTINFO:
1891 case IPV6_HOPOPTS:
1892 case IPV6_RTHDR:
1893 case IPV6_DSTOPTS:
1894 case IPV6_RTHDRDSTOPTS:
1895 case IPV6_NEXTHOP:
1896 {
1897 /* new advanced API (RFC3542) */
1898 u_char *optbuf;
1899 u_char optbuf_storage[MCLBYTES];
1900 int optlen;
1901 struct ip6_pktopts **optp;
1902
1903 /* cannot mix with RFC2292 */
1904 if (OPTBIT(IN6P_RFC2292)) {
1905 error = EINVAL;
1906 break;
1907 }
1908
1909 /*
1910 * We only ensure valsize is not too large
1911 * here. Further validation will be done
1912 * later.
1913 */
1914 error = sooptcopyin(sopt, optbuf_storage,
1915 sizeof(optbuf_storage), 0);
1916 if (error)
1917 break;
1918 optlen = sopt->sopt_valsize;
1919 optbuf = optbuf_storage;
1920 INP_WLOCK(inp);
1921 if (inp->inp_flags & INP_DROPPED) {
1922 INP_WUNLOCK(inp);
1923 return (ECONNRESET);
1924 }
1925 optp = &inp->in6p_outputopts;
1926 error = ip6_pcbopt(optname, optbuf, optlen,
1927 optp, (td != NULL) ? td->td_ucred : NULL,
1928 uproto);
1929 INP_WUNLOCK(inp);
1930 break;
1931 }
1932 #undef OPTSET
1933
1934 case IPV6_MULTICAST_IF:
1935 case IPV6_MULTICAST_HOPS:
1936 case IPV6_MULTICAST_LOOP:
1937 case IPV6_JOIN_GROUP:
1938 case IPV6_LEAVE_GROUP:
1939 case IPV6_MSFILTER:
1940 case MCAST_BLOCK_SOURCE:
1941 case MCAST_UNBLOCK_SOURCE:
1942 case MCAST_JOIN_GROUP:
1943 case MCAST_LEAVE_GROUP:
1944 case MCAST_JOIN_SOURCE_GROUP:
1945 case MCAST_LEAVE_SOURCE_GROUP:
1946 error = ip6_setmoptions(inp, sopt);
1947 break;
1948
1949 case IPV6_PORTRANGE:
1950 error = sooptcopyin(sopt, &optval,
1951 sizeof optval, sizeof optval);
1952 if (error)
1953 break;
1954
1955 INP_WLOCK(inp);
1956 switch (optval) {
1957 case IPV6_PORTRANGE_DEFAULT:
1958 inp->inp_flags &= ~(INP_LOWPORT);
1959 inp->inp_flags &= ~(INP_HIGHPORT);
1960 break;
1961
1962 case IPV6_PORTRANGE_HIGH:
1963 inp->inp_flags &= ~(INP_LOWPORT);
1964 inp->inp_flags |= INP_HIGHPORT;
1965 break;
1966
1967 case IPV6_PORTRANGE_LOW:
1968 inp->inp_flags &= ~(INP_HIGHPORT);
1969 inp->inp_flags |= INP_LOWPORT;
1970 break;
1971
1972 default:
1973 error = EINVAL;
1974 break;
1975 }
1976 INP_WUNLOCK(inp);
1977 break;
1978
1979 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1980 case IPV6_IPSEC_POLICY:
1981 if (IPSEC_ENABLED(ipv6)) {
1982 error = IPSEC_PCBCTL(ipv6, inp, sopt);
1983 break;
1984 }
1985 /* FALLTHROUGH */
1986 #endif /* IPSEC */
1987
1988 default:
1989 error = ENOPROTOOPT;
1990 break;
1991 }
1992 break;
1993
1994 case SOPT_GET:
1995 switch (optname) {
1996 case IPV6_2292PKTOPTIONS:
1997 #ifdef IPV6_PKTOPTIONS
1998 case IPV6_PKTOPTIONS:
1999 #endif
2000 /*
2001 * RFC3542 (effectively) deprecated the
2002 * semantics of the 2292-style pktoptions.
2003 * Since it was not reliable in nature (i.e.,
2004 * applications had to expect the lack of some
2005 * information after all), it would make sense
2006 * to simplify this part by always returning
2007 * empty data.
2008 */
2009 sopt->sopt_valsize = 0;
2010 break;
2011
2012 case IPV6_RECVHOPOPTS:
2013 case IPV6_RECVDSTOPTS:
2014 case IPV6_RECVRTHDRDSTOPTS:
2015 case IPV6_UNICAST_HOPS:
2016 case IPV6_RECVPKTINFO:
2017 case IPV6_RECVHOPLIMIT:
2018 case IPV6_RECVRTHDR:
2019 case IPV6_RECVPATHMTU:
2020
2021 case IPV6_V6ONLY:
2022 case IPV6_PORTRANGE:
2023 case IPV6_RECVTCLASS:
2024 case IPV6_AUTOFLOWLABEL:
2025 case IPV6_BINDANY:
2026 case IPV6_FLOWID:
2027 case IPV6_FLOWTYPE:
2028 case IPV6_RECVFLOWID:
2029 #ifdef RSS
2030 case IPV6_RSSBUCKETID:
2031 case IPV6_RECVRSSBUCKETID:
2032 #endif
2033 case IPV6_VLAN_PCP:
2034 switch (optname) {
2035 case IPV6_RECVHOPOPTS:
2036 optval = OPTBIT(IN6P_HOPOPTS);
2037 break;
2038
2039 case IPV6_RECVDSTOPTS:
2040 optval = OPTBIT(IN6P_DSTOPTS);
2041 break;
2042
2043 case IPV6_RECVRTHDRDSTOPTS:
2044 optval = OPTBIT(IN6P_RTHDRDSTOPTS);
2045 break;
2046
2047 case IPV6_UNICAST_HOPS:
2048 optval = inp->in6p_hops;
2049 break;
2050
2051 case IPV6_RECVPKTINFO:
2052 optval = OPTBIT(IN6P_PKTINFO);
2053 break;
2054
2055 case IPV6_RECVHOPLIMIT:
2056 optval = OPTBIT(IN6P_HOPLIMIT);
2057 break;
2058
2059 case IPV6_RECVRTHDR:
2060 optval = OPTBIT(IN6P_RTHDR);
2061 break;
2062
2063 case IPV6_RECVPATHMTU:
2064 optval = OPTBIT(IN6P_MTU);
2065 break;
2066
2067 case IPV6_V6ONLY:
2068 optval = OPTBIT(IN6P_IPV6_V6ONLY);
2069 break;
2070
2071 case IPV6_PORTRANGE:
2072 {
2073 int flags;
2074 flags = inp->inp_flags;
2075 if (flags & INP_HIGHPORT)
2076 optval = IPV6_PORTRANGE_HIGH;
2077 else if (flags & INP_LOWPORT)
2078 optval = IPV6_PORTRANGE_LOW;
2079 else
2080 optval = 0;
2081 break;
2082 }
2083 case IPV6_RECVTCLASS:
2084 optval = OPTBIT(IN6P_TCLASS);
2085 break;
2086
2087 case IPV6_AUTOFLOWLABEL:
2088 optval = OPTBIT(IN6P_AUTOFLOWLABEL);
2089 break;
2090
2091 case IPV6_ORIGDSTADDR:
2092 optval = OPTBIT2(INP_ORIGDSTADDR);
2093 break;
2094
2095 case IPV6_BINDANY:
2096 optval = OPTBIT(INP_BINDANY);
2097 break;
2098
2099 case IPV6_FLOWID:
2100 optval = inp->inp_flowid;
2101 break;
2102
2103 case IPV6_FLOWTYPE:
2104 optval = inp->inp_flowtype;
2105 break;
2106
2107 case IPV6_RECVFLOWID:
2108 optval = OPTBIT2(INP_RECVFLOWID);
2109 break;
2110 #ifdef RSS
2111 case IPV6_RSSBUCKETID:
2112 retval =
2113 rss_hash2bucket(inp->inp_flowid,
2114 inp->inp_flowtype,
2115 &rss_bucket);
2116 if (retval == 0)
2117 optval = rss_bucket;
2118 else
2119 error = EINVAL;
2120 break;
2121
2122 case IPV6_RECVRSSBUCKETID:
2123 optval = OPTBIT2(INP_RECVRSSBUCKETID);
2124 break;
2125 #endif
2126
2127
2128 case IPV6_VLAN_PCP:
2129 if (OPTBIT2(INP_2PCP_SET)) {
2130 optval = (inp->inp_flags2 &
2131 INP_2PCP_MASK) >>
2132 INP_2PCP_SHIFT;
2133 } else {
2134 optval = -1;
2135 }
2136 break;
2137 }
2138
2139 if (error)
2140 break;
2141 error = sooptcopyout(sopt, &optval,
2142 sizeof optval);
2143 break;
2144
2145 case IPV6_PATHMTU:
2146 {
2147 u_long pmtu = 0;
2148 struct ip6_mtuinfo mtuinfo;
2149 struct in6_addr addr;
2150
2151 if (!(so->so_state & SS_ISCONNECTED))
2152 return (ENOTCONN);
2153 /*
2154 * XXX: we dot not consider the case of source
2155 * routing, or optional information to specify
2156 * the outgoing interface.
2157 * Copy faddr out of inp to avoid holding lock
2158 * on inp during route lookup.
2159 */
2160 INP_RLOCK(inp);
2161 bcopy(&inp->in6p_faddr, &addr, sizeof(addr));
2162 INP_RUNLOCK(inp);
2163 error = ip6_getpmtu_ctl(so->so_fibnum,
2164 &addr, &pmtu);
2165 if (error)
2166 break;
2167 if (pmtu > IPV6_MAXPACKET)
2168 pmtu = IPV6_MAXPACKET;
2169
2170 bzero(&mtuinfo, sizeof(mtuinfo));
2171 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
2172 optdata = (void *)&mtuinfo;
2173 optdatalen = sizeof(mtuinfo);
2174 error = sooptcopyout(sopt, optdata,
2175 optdatalen);
2176 break;
2177 }
2178
2179 case IPV6_2292PKTINFO:
2180 case IPV6_2292HOPLIMIT:
2181 case IPV6_2292HOPOPTS:
2182 case IPV6_2292RTHDR:
2183 case IPV6_2292DSTOPTS:
2184 switch (optname) {
2185 case IPV6_2292PKTINFO:
2186 optval = OPTBIT(IN6P_PKTINFO);
2187 break;
2188 case IPV6_2292HOPLIMIT:
2189 optval = OPTBIT(IN6P_HOPLIMIT);
2190 break;
2191 case IPV6_2292HOPOPTS:
2192 optval = OPTBIT(IN6P_HOPOPTS);
2193 break;
2194 case IPV6_2292RTHDR:
2195 optval = OPTBIT(IN6P_RTHDR);
2196 break;
2197 case IPV6_2292DSTOPTS:
2198 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
2199 break;
2200 }
2201 error = sooptcopyout(sopt, &optval,
2202 sizeof optval);
2203 break;
2204 case IPV6_PKTINFO:
2205 case IPV6_HOPOPTS:
2206 case IPV6_RTHDR:
2207 case IPV6_DSTOPTS:
2208 case IPV6_RTHDRDSTOPTS:
2209 case IPV6_NEXTHOP:
2210 case IPV6_TCLASS:
2211 case IPV6_DONTFRAG:
2212 case IPV6_USE_MIN_MTU:
2213 case IPV6_PREFER_TEMPADDR:
2214 error = ip6_getpcbopt(inp, optname, sopt);
2215 break;
2216
2217 case IPV6_MULTICAST_IF:
2218 case IPV6_MULTICAST_HOPS:
2219 case IPV6_MULTICAST_LOOP:
2220 case IPV6_MSFILTER:
2221 error = ip6_getmoptions(inp, sopt);
2222 break;
2223
2224 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
2225 case IPV6_IPSEC_POLICY:
2226 if (IPSEC_ENABLED(ipv6)) {
2227 error = IPSEC_PCBCTL(ipv6, inp, sopt);
2228 break;
2229 }
2230 /* FALLTHROUGH */
2231 #endif /* IPSEC */
2232 default:
2233 error = ENOPROTOOPT;
2234 break;
2235 }
2236 break;
2237 }
2238 }
2239 return (error);
2240 }
2241
2242 int
ip6_raw_ctloutput(struct socket * so,struct sockopt * sopt)2243 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2244 {
2245 int error = 0, optval, optlen;
2246 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2247 struct inpcb *inp = sotoinpcb(so);
2248 int level, op, optname;
2249
2250 level = sopt->sopt_level;
2251 op = sopt->sopt_dir;
2252 optname = sopt->sopt_name;
2253 optlen = sopt->sopt_valsize;
2254
2255 if (level != IPPROTO_IPV6) {
2256 return (EINVAL);
2257 }
2258
2259 switch (optname) {
2260 case IPV6_CHECKSUM:
2261 /*
2262 * For ICMPv6 sockets, no modification allowed for checksum
2263 * offset, permit "no change" values to help existing apps.
2264 *
2265 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2266 * for an ICMPv6 socket will fail."
2267 * The current behavior does not meet RFC3542.
2268 */
2269 switch (op) {
2270 case SOPT_SET:
2271 if (optlen != sizeof(int)) {
2272 error = EINVAL;
2273 break;
2274 }
2275 error = sooptcopyin(sopt, &optval, sizeof(optval),
2276 sizeof(optval));
2277 if (error)
2278 break;
2279 if (optval < -1 || (optval % 2) != 0) {
2280 /*
2281 * The API assumes non-negative even offset
2282 * values or -1 as a special value.
2283 */
2284 error = EINVAL;
2285 } else if (inp->inp_ip_p == IPPROTO_ICMPV6) {
2286 if (optval != icmp6off)
2287 error = EINVAL;
2288 } else
2289 inp->in6p_cksum = optval;
2290 break;
2291
2292 case SOPT_GET:
2293 if (inp->inp_ip_p == IPPROTO_ICMPV6)
2294 optval = icmp6off;
2295 else
2296 optval = inp->in6p_cksum;
2297
2298 error = sooptcopyout(sopt, &optval, sizeof(optval));
2299 break;
2300
2301 default:
2302 error = EINVAL;
2303 break;
2304 }
2305 break;
2306
2307 default:
2308 error = ENOPROTOOPT;
2309 break;
2310 }
2311
2312 return (error);
2313 }
2314
2315 /*
2316 * Set up IP6 options in pcb for insertion in output packets or
2317 * specifying behavior of outgoing packets.
2318 */
2319 static int
ip6_pcbopts(struct ip6_pktopts ** pktopt,struct mbuf * m,struct socket * so,struct sockopt * sopt)2320 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2321 struct socket *so, struct sockopt *sopt)
2322 {
2323 struct ip6_pktopts *opt = *pktopt;
2324 int error = 0;
2325 struct thread *td = sopt->sopt_td;
2326 struct epoch_tracker et;
2327
2328 /* turn off any old options. */
2329 if (opt) {
2330 #ifdef DIAGNOSTIC
2331 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2332 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2333 opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2334 printf("ip6_pcbopts: all specified options are cleared.\n");
2335 #endif
2336 ip6_clearpktopts(opt, -1);
2337 } else {
2338 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT);
2339 if (opt == NULL)
2340 return (ENOMEM);
2341 }
2342 *pktopt = NULL;
2343
2344 if (!m || m->m_len == 0) {
2345 /*
2346 * Only turning off any previous options, regardless of
2347 * whether the opt is just created or given.
2348 */
2349 free(opt, M_IP6OPT);
2350 return (0);
2351 }
2352
2353 /* set options specified by user. */
2354 NET_EPOCH_ENTER(et);
2355 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2356 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2357 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2358 free(opt, M_IP6OPT);
2359 NET_EPOCH_EXIT(et);
2360 return (error);
2361 }
2362 NET_EPOCH_EXIT(et);
2363 *pktopt = opt;
2364 return (0);
2365 }
2366
2367 /*
2368 * initialize ip6_pktopts. beware that there are non-zero default values in
2369 * the struct.
2370 */
2371 void
ip6_initpktopts(struct ip6_pktopts * opt)2372 ip6_initpktopts(struct ip6_pktopts *opt)
2373 {
2374
2375 bzero(opt, sizeof(*opt));
2376 opt->ip6po_hlim = -1; /* -1 means default hop limit */
2377 opt->ip6po_tclass = -1; /* -1 means default traffic class */
2378 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2379 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2380 }
2381
2382 static int
ip6_pcbopt(int optname,u_char * buf,int len,struct ip6_pktopts ** pktopt,struct ucred * cred,int uproto)2383 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2384 struct ucred *cred, int uproto)
2385 {
2386 struct epoch_tracker et;
2387 struct ip6_pktopts *opt;
2388 int ret;
2389
2390 if (*pktopt == NULL) {
2391 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2392 M_NOWAIT);
2393 if (*pktopt == NULL)
2394 return (ENOBUFS);
2395 ip6_initpktopts(*pktopt);
2396 }
2397 opt = *pktopt;
2398
2399 NET_EPOCH_ENTER(et);
2400 ret = ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto);
2401 NET_EPOCH_EXIT(et);
2402
2403 return (ret);
2404 }
2405
2406 #define GET_PKTOPT_VAR(field, lenexpr) do { \
2407 if (pktopt && pktopt->field) { \
2408 INP_RUNLOCK(inp); \
2409 optdata = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK); \
2410 malloc_optdata = true; \
2411 INP_RLOCK(inp); \
2412 if (inp->inp_flags & INP_DROPPED) { \
2413 INP_RUNLOCK(inp); \
2414 free(optdata, M_TEMP); \
2415 return (ECONNRESET); \
2416 } \
2417 pktopt = inp->in6p_outputopts; \
2418 if (pktopt && pktopt->field) { \
2419 optdatalen = min(lenexpr, sopt->sopt_valsize); \
2420 bcopy(pktopt->field, optdata, optdatalen); \
2421 } else { \
2422 free(optdata, M_TEMP); \
2423 optdata = NULL; \
2424 malloc_optdata = false; \
2425 } \
2426 } \
2427 } while(0)
2428
2429 #define GET_PKTOPT_EXT_HDR(field) GET_PKTOPT_VAR(field, \
2430 (((struct ip6_ext *)pktopt->field)->ip6e_len + 1) << 3)
2431
2432 #define GET_PKTOPT_SOCKADDR(field) GET_PKTOPT_VAR(field, \
2433 pktopt->field->sa_len)
2434
2435 static int
ip6_getpcbopt(struct inpcb * inp,int optname,struct sockopt * sopt)2436 ip6_getpcbopt(struct inpcb *inp, int optname, struct sockopt *sopt)
2437 {
2438 void *optdata = NULL;
2439 bool malloc_optdata = false;
2440 int optdatalen = 0;
2441 int error = 0;
2442 struct in6_pktinfo null_pktinfo;
2443 int deftclass = 0, on;
2444 int defminmtu = IP6PO_MINMTU_MCASTONLY;
2445 int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2446 struct ip6_pktopts *pktopt;
2447
2448 INP_RLOCK(inp);
2449 pktopt = inp->in6p_outputopts;
2450
2451 switch (optname) {
2452 case IPV6_PKTINFO:
2453 optdata = (void *)&null_pktinfo;
2454 if (pktopt && pktopt->ip6po_pktinfo) {
2455 bcopy(pktopt->ip6po_pktinfo, &null_pktinfo,
2456 sizeof(null_pktinfo));
2457 in6_clearscope(&null_pktinfo.ipi6_addr);
2458 } else {
2459 /* XXX: we don't have to do this every time... */
2460 bzero(&null_pktinfo, sizeof(null_pktinfo));
2461 }
2462 optdatalen = sizeof(struct in6_pktinfo);
2463 break;
2464 case IPV6_TCLASS:
2465 if (pktopt && pktopt->ip6po_tclass >= 0)
2466 deftclass = pktopt->ip6po_tclass;
2467 optdata = (void *)&deftclass;
2468 optdatalen = sizeof(int);
2469 break;
2470 case IPV6_HOPOPTS:
2471 GET_PKTOPT_EXT_HDR(ip6po_hbh);
2472 break;
2473 case IPV6_RTHDR:
2474 GET_PKTOPT_EXT_HDR(ip6po_rthdr);
2475 break;
2476 case IPV6_RTHDRDSTOPTS:
2477 GET_PKTOPT_EXT_HDR(ip6po_dest1);
2478 break;
2479 case IPV6_DSTOPTS:
2480 GET_PKTOPT_EXT_HDR(ip6po_dest2);
2481 break;
2482 case IPV6_NEXTHOP:
2483 GET_PKTOPT_SOCKADDR(ip6po_nexthop);
2484 break;
2485 case IPV6_USE_MIN_MTU:
2486 if (pktopt)
2487 defminmtu = pktopt->ip6po_minmtu;
2488 optdata = (void *)&defminmtu;
2489 optdatalen = sizeof(int);
2490 break;
2491 case IPV6_DONTFRAG:
2492 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2493 on = 1;
2494 else
2495 on = 0;
2496 optdata = (void *)&on;
2497 optdatalen = sizeof(on);
2498 break;
2499 case IPV6_PREFER_TEMPADDR:
2500 if (pktopt)
2501 defpreftemp = pktopt->ip6po_prefer_tempaddr;
2502 optdata = (void *)&defpreftemp;
2503 optdatalen = sizeof(int);
2504 break;
2505 default: /* should not happen */
2506 #ifdef DIAGNOSTIC
2507 panic("ip6_getpcbopt: unexpected option\n");
2508 #endif
2509 INP_RUNLOCK(inp);
2510 return (ENOPROTOOPT);
2511 }
2512 INP_RUNLOCK(inp);
2513
2514 error = sooptcopyout(sopt, optdata, optdatalen);
2515 if (malloc_optdata)
2516 free(optdata, M_TEMP);
2517
2518 return (error);
2519 }
2520
2521 void
ip6_clearpktopts(struct ip6_pktopts * pktopt,int optname)2522 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2523 {
2524 if (pktopt == NULL)
2525 return;
2526
2527 if (optname == -1 || optname == IPV6_PKTINFO) {
2528 if (pktopt->ip6po_pktinfo)
2529 free(pktopt->ip6po_pktinfo, M_IP6OPT);
2530 pktopt->ip6po_pktinfo = NULL;
2531 }
2532 if (optname == -1 || optname == IPV6_HOPLIMIT) {
2533 pktopt->ip6po_hlim = -1;
2534 pktopt->ip6po_valid &= ~IP6PO_VALID_HLIM;
2535 }
2536 if (optname == -1 || optname == IPV6_TCLASS) {
2537 pktopt->ip6po_tclass = -1;
2538 pktopt->ip6po_valid &= ~IP6PO_VALID_TC;
2539 }
2540 if (optname == -1 || optname == IPV6_NEXTHOP) {
2541 if (pktopt->ip6po_nextroute.ro_nh) {
2542 NH_FREE(pktopt->ip6po_nextroute.ro_nh);
2543 pktopt->ip6po_nextroute.ro_nh = NULL;
2544 }
2545 if (pktopt->ip6po_nexthop)
2546 free(pktopt->ip6po_nexthop, M_IP6OPT);
2547 pktopt->ip6po_nexthop = NULL;
2548 pktopt->ip6po_valid &= ~IP6PO_VALID_NHINFO;
2549 }
2550 if (optname == -1 || optname == IPV6_HOPOPTS) {
2551 if (pktopt->ip6po_hbh)
2552 free(pktopt->ip6po_hbh, M_IP6OPT);
2553 pktopt->ip6po_hbh = NULL;
2554 pktopt->ip6po_valid &= ~IP6PO_VALID_HBH;
2555 }
2556 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2557 if (pktopt->ip6po_dest1)
2558 free(pktopt->ip6po_dest1, M_IP6OPT);
2559 pktopt->ip6po_dest1 = NULL;
2560 pktopt->ip6po_valid &= ~IP6PO_VALID_DEST1;
2561 }
2562 if (optname == -1 || optname == IPV6_RTHDR) {
2563 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2564 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2565 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2566 if (pktopt->ip6po_route.ro_nh) {
2567 NH_FREE(pktopt->ip6po_route.ro_nh);
2568 pktopt->ip6po_route.ro_nh = NULL;
2569 }
2570 pktopt->ip6po_valid &= ~IP6PO_VALID_RHINFO;
2571 }
2572 if (optname == -1 || optname == IPV6_DSTOPTS) {
2573 if (pktopt->ip6po_dest2)
2574 free(pktopt->ip6po_dest2, M_IP6OPT);
2575 pktopt->ip6po_dest2 = NULL;
2576 pktopt->ip6po_valid &= ~IP6PO_VALID_DEST2;
2577 }
2578 }
2579
2580 #define PKTOPT_EXTHDRCPY(type) \
2581 do {\
2582 if (src->type) {\
2583 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2584 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2585 if (dst->type == NULL)\
2586 goto bad;\
2587 bcopy(src->type, dst->type, hlen);\
2588 }\
2589 } while (/*CONSTCOND*/ 0)
2590
2591 static int
copypktopts(struct ip6_pktopts * dst,struct ip6_pktopts * src,int canwait)2592 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2593 {
2594 if (dst == NULL || src == NULL) {
2595 printf("ip6_clearpktopts: invalid argument\n");
2596 return (EINVAL);
2597 }
2598
2599 dst->ip6po_hlim = src->ip6po_hlim;
2600 dst->ip6po_tclass = src->ip6po_tclass;
2601 dst->ip6po_flags = src->ip6po_flags;
2602 dst->ip6po_minmtu = src->ip6po_minmtu;
2603 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2604 if (src->ip6po_pktinfo) {
2605 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2606 M_IP6OPT, canwait);
2607 if (dst->ip6po_pktinfo == NULL)
2608 goto bad;
2609 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2610 }
2611 if (src->ip6po_nexthop) {
2612 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2613 M_IP6OPT, canwait);
2614 if (dst->ip6po_nexthop == NULL)
2615 goto bad;
2616 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2617 src->ip6po_nexthop->sa_len);
2618 }
2619 PKTOPT_EXTHDRCPY(ip6po_hbh);
2620 PKTOPT_EXTHDRCPY(ip6po_dest1);
2621 PKTOPT_EXTHDRCPY(ip6po_dest2);
2622 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2623 dst->ip6po_valid = src->ip6po_valid;
2624 return (0);
2625
2626 bad:
2627 ip6_clearpktopts(dst, -1);
2628 return (ENOBUFS);
2629 }
2630 #undef PKTOPT_EXTHDRCPY
2631
2632 struct ip6_pktopts *
ip6_copypktopts(struct ip6_pktopts * src,int canwait)2633 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2634 {
2635 int error;
2636 struct ip6_pktopts *dst;
2637
2638 dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2639 if (dst == NULL)
2640 return (NULL);
2641 ip6_initpktopts(dst);
2642
2643 if ((error = copypktopts(dst, src, canwait)) != 0) {
2644 free(dst, M_IP6OPT);
2645 return (NULL);
2646 }
2647
2648 return (dst);
2649 }
2650
2651 void
ip6_freepcbopts(struct ip6_pktopts * pktopt)2652 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2653 {
2654 if (pktopt == NULL)
2655 return;
2656
2657 ip6_clearpktopts(pktopt, -1);
2658
2659 free(pktopt, M_IP6OPT);
2660 }
2661
2662 /*
2663 * Set IPv6 outgoing packet options based on advanced API.
2664 */
2665 int
ip6_setpktopts(struct mbuf * control,struct ip6_pktopts * opt,struct ip6_pktopts * stickyopt,struct ucred * cred,int uproto)2666 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2667 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2668 {
2669 struct cmsghdr *cm = NULL;
2670
2671 if (control == NULL || opt == NULL)
2672 return (EINVAL);
2673
2674 /*
2675 * ip6_setpktopt can call ifnet_byindex(), so it's imperative that we
2676 * are in the network epoch here.
2677 */
2678 NET_EPOCH_ASSERT();
2679
2680 ip6_initpktopts(opt);
2681 if (stickyopt) {
2682 int error;
2683
2684 /*
2685 * If stickyopt is provided, make a local copy of the options
2686 * for this particular packet, then override them by ancillary
2687 * objects.
2688 * XXX: copypktopts() does not copy the cached route to a next
2689 * hop (if any). This is not very good in terms of efficiency,
2690 * but we can allow this since this option should be rarely
2691 * used.
2692 */
2693 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2694 return (error);
2695 }
2696
2697 /*
2698 * XXX: Currently, we assume all the optional information is stored
2699 * in a single mbuf.
2700 */
2701 if (control->m_next)
2702 return (EINVAL);
2703
2704 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2705 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2706 int error;
2707
2708 if (control->m_len < CMSG_LEN(0))
2709 return (EINVAL);
2710
2711 cm = mtod(control, struct cmsghdr *);
2712 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2713 return (EINVAL);
2714 if (cm->cmsg_level != IPPROTO_IPV6)
2715 continue;
2716
2717 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2718 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2719 if (error)
2720 return (error);
2721 }
2722
2723 return (0);
2724 }
2725
2726 /*
2727 * Set a particular packet option, as a sticky option or an ancillary data
2728 * item. "len" can be 0 only when it's a sticky option.
2729 * We have 4 cases of combination of "sticky" and "cmsg":
2730 * "sticky=0, cmsg=0": impossible
2731 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2732 * "sticky=1, cmsg=0": RFC3542 socket option
2733 * "sticky=1, cmsg=1": RFC2292 socket option
2734 */
2735 static int
ip6_setpktopt(int optname,u_char * buf,int len,struct ip6_pktopts * opt,struct ucred * cred,int sticky,int cmsg,int uproto)2736 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2737 struct ucred *cred, int sticky, int cmsg, int uproto)
2738 {
2739 int minmtupolicy, preftemp;
2740 int error;
2741
2742 NET_EPOCH_ASSERT();
2743
2744 if (!sticky && !cmsg) {
2745 #ifdef DIAGNOSTIC
2746 printf("ip6_setpktopt: impossible case\n");
2747 #endif
2748 return (EINVAL);
2749 }
2750
2751 /*
2752 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2753 * not be specified in the context of RFC3542. Conversely,
2754 * RFC3542 types should not be specified in the context of RFC2292.
2755 */
2756 if (!cmsg) {
2757 switch (optname) {
2758 case IPV6_2292PKTINFO:
2759 case IPV6_2292HOPLIMIT:
2760 case IPV6_2292NEXTHOP:
2761 case IPV6_2292HOPOPTS:
2762 case IPV6_2292DSTOPTS:
2763 case IPV6_2292RTHDR:
2764 case IPV6_2292PKTOPTIONS:
2765 return (ENOPROTOOPT);
2766 }
2767 }
2768 if (sticky && cmsg) {
2769 switch (optname) {
2770 case IPV6_PKTINFO:
2771 case IPV6_HOPLIMIT:
2772 case IPV6_NEXTHOP:
2773 case IPV6_HOPOPTS:
2774 case IPV6_DSTOPTS:
2775 case IPV6_RTHDRDSTOPTS:
2776 case IPV6_RTHDR:
2777 case IPV6_USE_MIN_MTU:
2778 case IPV6_DONTFRAG:
2779 case IPV6_TCLASS:
2780 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2781 return (ENOPROTOOPT);
2782 }
2783 }
2784
2785 switch (optname) {
2786 case IPV6_2292PKTINFO:
2787 case IPV6_PKTINFO:
2788 {
2789 struct ifnet *ifp = NULL;
2790 struct in6_pktinfo *pktinfo;
2791
2792 if (len != sizeof(struct in6_pktinfo))
2793 return (EINVAL);
2794
2795 pktinfo = (struct in6_pktinfo *)buf;
2796
2797 /*
2798 * An application can clear any sticky IPV6_PKTINFO option by
2799 * doing a "regular" setsockopt with ipi6_addr being
2800 * in6addr_any and ipi6_ifindex being zero.
2801 * [RFC 3542, Section 6]
2802 */
2803 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2804 pktinfo->ipi6_ifindex == 0 &&
2805 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2806 ip6_clearpktopts(opt, optname);
2807 break;
2808 }
2809
2810 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2811 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2812 return (EINVAL);
2813 }
2814 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr))
2815 return (EINVAL);
2816 /* validate the interface index if specified. */
2817 if (pktinfo->ipi6_ifindex) {
2818 ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2819 if (ifp == NULL)
2820 return (ENXIO);
2821 }
2822 if (ifp != NULL && (ifp->if_inet6 == NULL ||
2823 (ifp->if_inet6->nd_flags & ND6_IFF_IFDISABLED) != 0))
2824 return (ENETDOWN);
2825
2826 if (ifp != NULL &&
2827 !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2828 struct in6_ifaddr *ia;
2829
2830 in6_setscope(&pktinfo->ipi6_addr, ifp, NULL);
2831 ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr);
2832 if (ia == NULL)
2833 return (EADDRNOTAVAIL);
2834 ifa_free(&ia->ia_ifa);
2835 }
2836 /*
2837 * We store the address anyway, and let in6_selectsrc()
2838 * validate the specified address. This is because ipi6_addr
2839 * may not have enough information about its scope zone, and
2840 * we may need additional information (such as outgoing
2841 * interface or the scope zone of a destination address) to
2842 * disambiguate the scope.
2843 * XXX: the delay of the validation may confuse the
2844 * application when it is used as a sticky option.
2845 */
2846 if (opt->ip6po_pktinfo == NULL) {
2847 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2848 M_IP6OPT, M_NOWAIT);
2849 if (opt->ip6po_pktinfo == NULL)
2850 return (ENOBUFS);
2851 }
2852 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2853 opt->ip6po_valid |= IP6PO_VALID_PKTINFO;
2854 break;
2855 }
2856
2857 case IPV6_2292HOPLIMIT:
2858 case IPV6_HOPLIMIT:
2859 {
2860 int *hlimp;
2861
2862 /*
2863 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2864 * to simplify the ordering among hoplimit options.
2865 */
2866 if (optname == IPV6_HOPLIMIT && sticky)
2867 return (ENOPROTOOPT);
2868
2869 if (len != sizeof(int))
2870 return (EINVAL);
2871 hlimp = (int *)buf;
2872 if (*hlimp < -1 || *hlimp > 255)
2873 return (EINVAL);
2874
2875 opt->ip6po_hlim = *hlimp;
2876 opt->ip6po_valid |= IP6PO_VALID_HLIM;
2877 break;
2878 }
2879
2880 case IPV6_TCLASS:
2881 {
2882 int tclass;
2883
2884 if (len != sizeof(int))
2885 return (EINVAL);
2886 tclass = *(int *)buf;
2887 if (tclass < -1 || tclass > 255)
2888 return (EINVAL);
2889
2890 opt->ip6po_tclass = tclass;
2891 opt->ip6po_valid |= IP6PO_VALID_TC;
2892 break;
2893 }
2894
2895 case IPV6_2292NEXTHOP:
2896 case IPV6_NEXTHOP:
2897 if (cred != NULL) {
2898 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
2899 if (error)
2900 return (error);
2901 }
2902
2903 if (len == 0) { /* just remove the option */
2904 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2905 break;
2906 }
2907
2908 /* check if cmsg_len is large enough for sa_len */
2909 if (len < sizeof(struct sockaddr) || len < *buf)
2910 return (EINVAL);
2911
2912 switch (((struct sockaddr *)buf)->sa_family) {
2913 case AF_INET6:
2914 {
2915 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
2916 int error;
2917
2918 if (sa6->sin6_len != sizeof(struct sockaddr_in6))
2919 return (EINVAL);
2920
2921 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
2922 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
2923 return (EINVAL);
2924 }
2925 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
2926 != 0) {
2927 return (error);
2928 }
2929 break;
2930 }
2931 case AF_LINK: /* should eventually be supported */
2932 default:
2933 return (EAFNOSUPPORT);
2934 }
2935
2936 /* turn off the previous option, then set the new option. */
2937 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2938 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
2939 if (opt->ip6po_nexthop == NULL)
2940 return (ENOBUFS);
2941 bcopy(buf, opt->ip6po_nexthop, *buf);
2942 opt->ip6po_valid |= IP6PO_VALID_NHINFO;
2943 break;
2944
2945 case IPV6_2292HOPOPTS:
2946 case IPV6_HOPOPTS:
2947 {
2948 struct ip6_hbh *hbh;
2949 int hbhlen;
2950
2951 /*
2952 * XXX: We don't allow a non-privileged user to set ANY HbH
2953 * options, since per-option restriction has too much
2954 * overhead.
2955 */
2956 if (cred != NULL) {
2957 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
2958 if (error)
2959 return (error);
2960 }
2961
2962 if (len == 0) {
2963 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2964 break; /* just remove the option */
2965 }
2966
2967 /* message length validation */
2968 if (len < sizeof(struct ip6_hbh))
2969 return (EINVAL);
2970 hbh = (struct ip6_hbh *)buf;
2971 hbhlen = (hbh->ip6h_len + 1) << 3;
2972 if (len != hbhlen)
2973 return (EINVAL);
2974
2975 /* turn off the previous option, then set the new option. */
2976 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2977 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
2978 if (opt->ip6po_hbh == NULL)
2979 return (ENOBUFS);
2980 bcopy(hbh, opt->ip6po_hbh, hbhlen);
2981 opt->ip6po_valid |= IP6PO_VALID_HBH;
2982
2983 break;
2984 }
2985
2986 case IPV6_2292DSTOPTS:
2987 case IPV6_DSTOPTS:
2988 case IPV6_RTHDRDSTOPTS:
2989 {
2990 struct ip6_dest *dest, **newdest = NULL;
2991 int destlen;
2992
2993 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
2994 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
2995 if (error)
2996 return (error);
2997 }
2998
2999 if (len == 0) {
3000 ip6_clearpktopts(opt, optname);
3001 break; /* just remove the option */
3002 }
3003
3004 /* message length validation */
3005 if (len < sizeof(struct ip6_dest))
3006 return (EINVAL);
3007 dest = (struct ip6_dest *)buf;
3008 destlen = (dest->ip6d_len + 1) << 3;
3009 if (len != destlen)
3010 return (EINVAL);
3011
3012 /*
3013 * Determine the position that the destination options header
3014 * should be inserted; before or after the routing header.
3015 */
3016 switch (optname) {
3017 case IPV6_2292DSTOPTS:
3018 /*
3019 * The old advacned API is ambiguous on this point.
3020 * Our approach is to determine the position based
3021 * according to the existence of a routing header.
3022 * Note, however, that this depends on the order of the
3023 * extension headers in the ancillary data; the 1st
3024 * part of the destination options header must appear
3025 * before the routing header in the ancillary data,
3026 * too.
3027 * RFC3542 solved the ambiguity by introducing
3028 * separate ancillary data or option types.
3029 */
3030 if (opt->ip6po_rthdr == NULL)
3031 newdest = &opt->ip6po_dest1;
3032 else
3033 newdest = &opt->ip6po_dest2;
3034 break;
3035 case IPV6_RTHDRDSTOPTS:
3036 newdest = &opt->ip6po_dest1;
3037 break;
3038 case IPV6_DSTOPTS:
3039 newdest = &opt->ip6po_dest2;
3040 break;
3041 }
3042
3043 /* turn off the previous option, then set the new option. */
3044 ip6_clearpktopts(opt, optname);
3045 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
3046 if (*newdest == NULL)
3047 return (ENOBUFS);
3048 bcopy(dest, *newdest, destlen);
3049 if (newdest == &opt->ip6po_dest1)
3050 opt->ip6po_valid |= IP6PO_VALID_DEST1;
3051 else
3052 opt->ip6po_valid |= IP6PO_VALID_DEST2;
3053
3054 break;
3055 }
3056
3057 case IPV6_2292RTHDR:
3058 case IPV6_RTHDR:
3059 {
3060 struct ip6_rthdr *rth;
3061 int rthlen;
3062
3063 if (len == 0) {
3064 ip6_clearpktopts(opt, IPV6_RTHDR);
3065 break; /* just remove the option */
3066 }
3067
3068 /* message length validation */
3069 if (len < sizeof(struct ip6_rthdr))
3070 return (EINVAL);
3071 rth = (struct ip6_rthdr *)buf;
3072 rthlen = (rth->ip6r_len + 1) << 3;
3073 if (len != rthlen)
3074 return (EINVAL);
3075
3076 switch (rth->ip6r_type) {
3077 case IPV6_RTHDR_TYPE_0:
3078 if (rth->ip6r_len == 0) /* must contain one addr */
3079 return (EINVAL);
3080 if (rth->ip6r_len % 2) /* length must be even */
3081 return (EINVAL);
3082 if (rth->ip6r_len / 2 != rth->ip6r_segleft)
3083 return (EINVAL);
3084 break;
3085 default:
3086 return (EINVAL); /* not supported */
3087 }
3088
3089 /* turn off the previous option */
3090 ip6_clearpktopts(opt, IPV6_RTHDR);
3091 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
3092 if (opt->ip6po_rthdr == NULL)
3093 return (ENOBUFS);
3094 bcopy(rth, opt->ip6po_rthdr, rthlen);
3095 opt->ip6po_valid |= IP6PO_VALID_RHINFO;
3096
3097 break;
3098 }
3099
3100 case IPV6_USE_MIN_MTU:
3101 if (len != sizeof(int))
3102 return (EINVAL);
3103 minmtupolicy = *(int *)buf;
3104 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
3105 minmtupolicy != IP6PO_MINMTU_DISABLE &&
3106 minmtupolicy != IP6PO_MINMTU_ALL) {
3107 return (EINVAL);
3108 }
3109 opt->ip6po_minmtu = minmtupolicy;
3110 break;
3111
3112 case IPV6_DONTFRAG:
3113 if (len != sizeof(int))
3114 return (EINVAL);
3115
3116 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
3117 /*
3118 * we ignore this option for TCP sockets.
3119 * (RFC3542 leaves this case unspecified.)
3120 */
3121 opt->ip6po_flags &= ~IP6PO_DONTFRAG;
3122 } else
3123 opt->ip6po_flags |= IP6PO_DONTFRAG;
3124 break;
3125
3126 case IPV6_PREFER_TEMPADDR:
3127 if (len != sizeof(int))
3128 return (EINVAL);
3129 preftemp = *(int *)buf;
3130 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
3131 preftemp != IP6PO_TEMPADDR_NOTPREFER &&
3132 preftemp != IP6PO_TEMPADDR_PREFER) {
3133 return (EINVAL);
3134 }
3135 opt->ip6po_prefer_tempaddr = preftemp;
3136 break;
3137
3138 default:
3139 return (ENOPROTOOPT);
3140 } /* end of switch */
3141
3142 return (0);
3143 }
3144
3145 /*
3146 * Routine called from ip6_output() to loop back a copy of an IP6 multicast
3147 * packet to the input queue of a specified interface. Note that this
3148 * calls the output routine of the loopback "driver", but with an interface
3149 * pointer that might NOT be &loif -- easier than replicating that code here.
3150 */
3151 void
ip6_mloopback(struct ifnet * ifp,struct mbuf * m)3152 ip6_mloopback(struct ifnet *ifp, struct mbuf *m)
3153 {
3154 struct mbuf *copym;
3155 struct ip6_hdr *ip6;
3156
3157 copym = m_copym(m, 0, M_COPYALL, M_NOWAIT);
3158 if (copym == NULL)
3159 return;
3160
3161 /*
3162 * Make sure to deep-copy IPv6 header portion in case the data
3163 * is in an mbuf cluster, so that we can safely override the IPv6
3164 * header portion later.
3165 */
3166 if (!M_WRITABLE(copym) ||
3167 copym->m_len < sizeof(struct ip6_hdr)) {
3168 copym = m_pullup(copym, sizeof(struct ip6_hdr));
3169 if (copym == NULL)
3170 return;
3171 }
3172 ip6 = mtod(copym, struct ip6_hdr *);
3173 /*
3174 * clear embedded scope identifiers if necessary.
3175 * in6_clearscope will touch the addresses only when necessary.
3176 */
3177 in6_clearscope(&ip6->ip6_src);
3178 in6_clearscope(&ip6->ip6_dst);
3179 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
3180 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 |
3181 CSUM_PSEUDO_HDR;
3182 copym->m_pkthdr.csum_data = 0xffff;
3183 }
3184 if_simloop(ifp, copym, AF_INET6, 0);
3185 }
3186
3187 /*
3188 * Chop IPv6 header off from the payload.
3189 */
3190 static int
ip6_splithdr(struct mbuf * m,struct ip6_exthdrs * exthdrs)3191 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
3192 {
3193 struct mbuf *mh;
3194 struct ip6_hdr *ip6;
3195
3196 ip6 = mtod(m, struct ip6_hdr *);
3197 if (m->m_len > sizeof(*ip6)) {
3198 mh = m_gethdr(M_NOWAIT, MT_DATA);
3199 if (mh == NULL) {
3200 m_freem(m);
3201 return ENOBUFS;
3202 }
3203 m_move_pkthdr(mh, m);
3204 M_ALIGN(mh, sizeof(*ip6));
3205 m->m_len -= sizeof(*ip6);
3206 m->m_data += sizeof(*ip6);
3207 mh->m_next = m;
3208 m = mh;
3209 m->m_len = sizeof(*ip6);
3210 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
3211 }
3212 exthdrs->ip6e_ip6 = m;
3213 return 0;
3214 }
3215
3216 /*
3217 * Compute IPv6 extension header length.
3218 */
3219 int
ip6_optlen(struct inpcb * inp)3220 ip6_optlen(struct inpcb *inp)
3221 {
3222 int len;
3223
3224 if (!inp->in6p_outputopts)
3225 return 0;
3226
3227 len = 0;
3228 #define elen(x) \
3229 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
3230
3231 len += elen(inp->in6p_outputopts->ip6po_hbh);
3232 if (inp->in6p_outputopts->ip6po_rthdr)
3233 /* dest1 is valid with rthdr only */
3234 len += elen(inp->in6p_outputopts->ip6po_dest1);
3235 len += elen(inp->in6p_outputopts->ip6po_rthdr);
3236 len += elen(inp->in6p_outputopts->ip6po_dest2);
3237 return len;
3238 #undef elen
3239 }
3240