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_rss.h"
69 #include "opt_sctp.h"
70
71 #include <sys/param.h>
72 #include <sys/kernel.h>
73 #include <sys/ktls.h>
74 #include <sys/malloc.h>
75 #include <sys/mbuf.h>
76 #include <sys/errno.h>
77 #include <sys/priv.h>
78 #include <sys/proc.h>
79 #include <sys/protosw.h>
80 #include <sys/socket.h>
81 #include <sys/socketvar.h>
82 #include <sys/syslog.h>
83 #include <sys/ucred.h>
84
85 #include <machine/in_cksum.h>
86
87 #include <net/if.h>
88 #include <net/if_var.h>
89 #include <net/if_private.h>
90 #include <net/if_vlan_var.h>
91 #include <net/if_llatbl.h>
92 #include <net/ethernet.h>
93 #include <net/netisr.h>
94 #include <net/route.h>
95 #include <net/route/nhop.h>
96 #include <net/pfil.h>
97 #include <net/rss_config.h>
98 #include <net/vnet.h>
99
100 #include <netinet/in.h>
101 #include <netinet/in_var.h>
102 #include <netinet/ip_var.h>
103 #include <netinet6/in6_fib.h>
104 #include <netinet6/in6_var.h>
105 #include <netinet/ip6.h>
106 #include <netinet/icmp6.h>
107 #include <netinet6/ip6_var.h>
108 #include <netinet/in_pcb.h>
109 #include <netinet/tcp_var.h>
110 #include <netinet6/nd6.h>
111 #include <netinet6/in6_rss.h>
112 #include <netinet6/ip6_mroute.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_mrouting_enabled &&
893 (flags & IPV6_FORWARDING) == 0) {
894 /*
895 * XXX: ip6_mforward expects that rcvif is NULL
896 * when it is called from the originating path.
897 * However, it may not always be the case.
898 */
899 m->m_pkthdr.rcvif = NULL;
900 if (ip6_mforward(ip6, ifp, m) != 0) {
901 m_freem(m);
902 goto done;
903 }
904 }
905 }
906 /*
907 * Multicasts with a hoplimit of zero may be looped back,
908 * above, but must not be transmitted on a network.
909 * Also, multicasts addressed to the loopback interface
910 * are not sent -- the above call to ip6_mloopback() will
911 * loop back a copy if this host actually belongs to the
912 * destination group on the loopback interface.
913 */
914 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
915 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
916 m_freem(m);
917 goto done;
918 }
919 }
920
921 /*
922 * Fill the outgoing inteface to tell the upper layer
923 * to increment per-interface statistics.
924 */
925 if (ifpp)
926 *ifpp = ifp;
927
928 /* Determine path MTU. */
929 ip6_getpmtu(ro_pmtu, ro != ro_pmtu, ifp, &ip6->ip6_dst, &mtu, fibnum,
930 *nexthdrp);
931 KASSERT(mtu > 0, ("%s:%d: mtu %ld, ro_pmtu %p ro %p ifp %p fibnum %u",
932 __func__, __LINE__, mtu, ro_pmtu, ro, ifp, fibnum));
933
934 /*
935 * The caller of this function may specify to use the minimum MTU
936 * in some cases.
937 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
938 * setting. The logic is a bit complicated; by default, unicast
939 * packets will follow path MTU while multicast packets will be sent at
940 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
941 * including unicast ones will be sent at the minimum MTU. Multicast
942 * packets will always be sent at the minimum MTU unless
943 * IP6PO_MINMTU_DISABLE is explicitly specified.
944 * See RFC 3542 for more details.
945 */
946 if (mtu > IPV6_MMTU) {
947 if ((flags & IPV6_MINMTU))
948 mtu = IPV6_MMTU;
949 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
950 mtu = IPV6_MMTU;
951 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
952 (opt == NULL ||
953 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
954 mtu = IPV6_MMTU;
955 }
956 }
957
958 /*
959 * Clear embedded scope identifiers if necessary.
960 * in6_clearscope() will touch the addresses only when necessary.
961 */
962 in6_clearscope(&ip6->ip6_src);
963 in6_clearscope(&ip6->ip6_dst);
964
965 /*
966 * If the outgoing packet contains a hop-by-hop options header,
967 * it must be examined and processed even by the source node.
968 * (RFC 2460, section 4.)
969 */
970 if (exthdrs.ip6e_hbh) {
971 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
972 u_int32_t dummy; /* XXX unused */
973
974 #ifdef DIAGNOSTIC
975 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
976 panic("ip6e_hbh is not contiguous");
977 #endif
978 /*
979 * XXX: if we have to send an ICMPv6 error to the sender,
980 * we need the M_LOOP flag since icmp6_error() expects
981 * the IPv6 and the hop-by-hop options header are
982 * contiguous unless the flag is set.
983 */
984 m->m_flags |= M_LOOP;
985 m->m_pkthdr.rcvif = ifp;
986 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
987 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
988 &dummy) < 0) {
989 /* m was already freed at this point. */
990 error = EINVAL;/* better error? */
991 goto done;
992 }
993 m->m_flags &= ~M_LOOP; /* XXX */
994 m->m_pkthdr.rcvif = NULL;
995 }
996
997 /* Jump over all PFIL processing if hooks are not active. */
998 if (!PFIL_HOOKED_OUT(V_inet6_pfil_head))
999 goto passout;
1000
1001 odst = ip6->ip6_dst;
1002 /* Run through list of hooks for output packets. */
1003 switch (pfil_mbuf_out(V_inet6_pfil_head, &m, ifp, inp)) {
1004 case PFIL_PASS:
1005 ip6 = mtod(m, struct ip6_hdr *);
1006 break;
1007 case PFIL_DROPPED:
1008 error = EACCES;
1009 /* FALLTHROUGH */
1010 case PFIL_CONSUMED:
1011 goto done;
1012 }
1013
1014 needfiblookup = 0;
1015 /* See if destination IP address was changed by packet filter. */
1016 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
1017 m->m_flags |= M_SKIP_FIREWALL;
1018 /* If destination is now ourself drop to ip6_input(). */
1019 if (in6_localip(&ip6->ip6_dst)) {
1020 m->m_flags |= M_FASTFWD_OURS;
1021 if (m->m_pkthdr.rcvif == NULL)
1022 m->m_pkthdr.rcvif = V_loif;
1023 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1024 m->m_pkthdr.csum_flags |=
1025 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
1026 m->m_pkthdr.csum_data = 0xffff;
1027 }
1028 #if defined(SCTP) || defined(SCTP_SUPPORT)
1029 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
1030 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
1031 #endif
1032 error = netisr_queue(NETISR_IPV6, m);
1033 goto done;
1034 } else {
1035 if (ro != NULL)
1036 RO_INVALIDATE_CACHE(ro);
1037 needfiblookup = 1; /* Redo the routing table lookup. */
1038 }
1039 }
1040 /* See if fib was changed by packet filter. */
1041 if (fibnum != M_GETFIB(m)) {
1042 m->m_flags |= M_SKIP_FIREWALL;
1043 fibnum = M_GETFIB(m);
1044 if (ro != NULL)
1045 RO_INVALIDATE_CACHE(ro);
1046 needfiblookup = 1;
1047 }
1048 if (needfiblookup)
1049 goto again;
1050
1051 /* See if local, if yes, send it to netisr. */
1052 if (m->m_flags & M_FASTFWD_OURS) {
1053 if (m->m_pkthdr.rcvif == NULL)
1054 m->m_pkthdr.rcvif = V_loif;
1055 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
1056 m->m_pkthdr.csum_flags |=
1057 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
1058 m->m_pkthdr.csum_data = 0xffff;
1059 }
1060 #if defined(SCTP) || defined(SCTP_SUPPORT)
1061 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
1062 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
1063 #endif
1064 error = netisr_queue(NETISR_IPV6, m);
1065 goto done;
1066 }
1067 /* Or forward to some other address? */
1068 if ((m->m_flags & M_IP6_NEXTHOP) &&
1069 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
1070 if (ro != NULL)
1071 dst = (struct sockaddr_in6 *)&ro->ro_dst;
1072 else
1073 dst = &sin6;
1074 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
1075 m->m_flags |= M_SKIP_FIREWALL;
1076 m->m_flags &= ~M_IP6_NEXTHOP;
1077 m_tag_delete(m, fwd_tag);
1078 goto again;
1079 }
1080
1081 passout:
1082 if (vlan_pcp > -1)
1083 EVL_APPLY_PRI(m, vlan_pcp);
1084
1085 /* Ensure the packet data is mapped if the interface requires it. */
1086 if ((ifp->if_capenable & IFCAP_MEXTPG) == 0) {
1087 struct mbuf *m1;
1088
1089 error = mb_unmapped_to_ext(m, &m1);
1090 if (error != 0) {
1091 if (error == EINVAL) {
1092 if_printf(ifp, "TLS packet\n");
1093 /* XXXKIB */
1094 } else if (error == ENOMEM) {
1095 error = ENOBUFS;
1096 }
1097 IP6STAT_INC(ip6s_odropped);
1098 return (error);
1099 } else {
1100 m = m1;
1101 }
1102 }
1103
1104 /*
1105 * Send the packet to the outgoing interface.
1106 * If necessary, do IPv6 fragmentation before sending.
1107 *
1108 * 1: normal case (dontfrag == 0)
1109 * 1-a: send as is if tlen <= path mtu
1110 * 1-b: fragment if tlen > path mtu
1111 *
1112 * 2: if user asks us not to fragment (dontfrag == 1)
1113 * 2-a: send as is if tlen <= interface mtu
1114 * 2-b: error if tlen > interface mtu
1115 */
1116 sw_csum = m->m_pkthdr.csum_flags;
1117 if (!hdrsplit) {
1118 tso = ((sw_csum & ifp->if_hwassist &
1119 (CSUM_TSO | CSUM_INNER_TSO)) != 0) ? 1 : 0;
1120 sw_csum &= ~ifp->if_hwassist;
1121 } else
1122 tso = 0;
1123 /*
1124 * If we added extension headers, we will not do TSO and calculate the
1125 * checksums ourselves for now.
1126 * XXX-BZ Need a framework to know when the NIC can handle it, even
1127 * with ext. hdrs.
1128 */
1129 ip6_output_delayed_csum(m, ifp, sw_csum, plen, optlen);
1130 /* XXX-BZ m->m_pkthdr.csum_flags &= ~ifp->if_hwassist; */
1131 tlen = m->m_pkthdr.len;
1132
1133 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
1134 dontfrag = 1;
1135 else
1136 dontfrag = 0;
1137 if (dontfrag && tlen > in6_ifmtu(ifp) && !tso) { /* Case 2-b. */
1138 /*
1139 * If the DONTFRAG option is specified, we cannot send the
1140 * packet when the data length is larger than the MTU of the
1141 * outgoing interface.
1142 * Notify the error by sending IPV6_PATHMTU ancillary data if
1143 * application wanted to know the MTU value. Also return an
1144 * error code (this is not described in the API spec).
1145 */
1146 if (inp != NULL)
1147 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu);
1148 error = EMSGSIZE;
1149 goto bad;
1150 }
1151
1152 /* Transmit packet without fragmentation. */
1153 if (dontfrag || tlen <= mtu) { /* Cases 1-a and 2-a. */
1154 struct in6_ifaddr *ia6;
1155
1156 ip6 = mtod(m, struct ip6_hdr *);
1157 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
1158 if (ia6) {
1159 /* Record statistics for this interface address. */
1160 counter_u64_add(ia6->ia_ifa.ifa_opackets, 1);
1161 counter_u64_add(ia6->ia_ifa.ifa_obytes,
1162 m->m_pkthdr.len);
1163 }
1164 error = ip6_output_send(inp, ifp, origifp, m, dst, ro,
1165 (flags & IP_NO_SND_TAG_RL) ? false : true);
1166 goto done;
1167 }
1168
1169 /* Try to fragment the packet. Case 1-b. */
1170 if (mtu < IPV6_MMTU) {
1171 /* Path MTU cannot be less than IPV6_MMTU. */
1172 error = EMSGSIZE;
1173 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1174 goto bad;
1175 } else if (ip6->ip6_plen == 0) {
1176 /* We do not support jumbo payload. */
1177 error = EMSGSIZE;
1178 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1179 goto bad;
1180 } else {
1181 u_char nextproto;
1182
1183 /*
1184 * Too large for the destination or interface;
1185 * fragment if possible.
1186 * Must be able to put at least 8 bytes per fragment.
1187 */
1188 if (mtu > IPV6_MAXPACKET)
1189 mtu = IPV6_MAXPACKET;
1190
1191 len = (mtu - unfragpartlen - sizeof(struct ip6_frag)) & ~7;
1192 if (len < 8) {
1193 error = EMSGSIZE;
1194 in6_ifstat_inc(ifp, ifs6_out_fragfail);
1195 goto bad;
1196 }
1197
1198 /*
1199 * If the interface will not calculate checksums on
1200 * fragmented packets, then do it here.
1201 * XXX-BZ handle the hw offloading case. Need flags.
1202 */
1203 ip6_output_delayed_csum(m, ifp, m->m_pkthdr.csum_flags, plen,
1204 optlen);
1205
1206 /*
1207 * Change the next header field of the last header in the
1208 * unfragmentable part.
1209 */
1210 if (exthdrs.ip6e_rthdr) {
1211 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
1212 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
1213 } else if (exthdrs.ip6e_dest1) {
1214 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
1215 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
1216 } else if (exthdrs.ip6e_hbh) {
1217 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
1218 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
1219 } else {
1220 ip6 = mtod(m, struct ip6_hdr *);
1221 nextproto = ip6->ip6_nxt;
1222 ip6->ip6_nxt = IPPROTO_FRAGMENT;
1223 }
1224
1225 /*
1226 * Loop through length of segment after first fragment,
1227 * make new header and copy data of each part and link onto
1228 * chain.
1229 */
1230 m0 = m;
1231 id = htonl(ip6_randomid());
1232 error = ip6_fragment(ifp, m, unfragpartlen, nextproto,len, id);
1233 if (error != 0)
1234 goto sendorfree;
1235
1236 in6_ifstat_inc(ifp, ifs6_out_fragok);
1237 }
1238
1239 /* Remove leading garbage. */
1240 sendorfree:
1241 m = m0->m_nextpkt;
1242 m0->m_nextpkt = 0;
1243 m_freem(m0);
1244 for (; m; m = m0) {
1245 m0 = m->m_nextpkt;
1246 m->m_nextpkt = 0;
1247 if (error == 0) {
1248 /* Record statistics for this interface address. */
1249 if (ia) {
1250 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
1251 counter_u64_add(ia->ia_ifa.ifa_obytes,
1252 m->m_pkthdr.len);
1253 }
1254 if (vlan_pcp > -1)
1255 EVL_APPLY_PRI(m, vlan_pcp);
1256 error = ip6_output_send(inp, ifp, origifp, m, dst, ro,
1257 true);
1258 } else
1259 m_freem(m);
1260 }
1261
1262 if (error == 0)
1263 IP6STAT_INC(ip6s_fragmented);
1264
1265 done:
1266 return (error);
1267
1268 freehdrs:
1269 m_freem(exthdrs.ip6e_hbh); /* m_freem() checks if mbuf is NULL. */
1270 m_freem(exthdrs.ip6e_dest1);
1271 m_freem(exthdrs.ip6e_rthdr);
1272 m_freem(exthdrs.ip6e_dest2);
1273 /* FALLTHROUGH */
1274 bad:
1275 if (m)
1276 m_freem(m);
1277 goto done;
1278 }
1279
1280 static int
ip6_copyexthdr(struct mbuf ** mp,caddr_t hdr,int hlen)1281 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1282 {
1283 struct mbuf *m;
1284
1285 if (hlen > MCLBYTES)
1286 return (ENOBUFS); /* XXX */
1287
1288 if (hlen > MLEN)
1289 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1290 else
1291 m = m_get(M_NOWAIT, MT_DATA);
1292 if (m == NULL)
1293 return (ENOBUFS);
1294 m->m_len = hlen;
1295 if (hdr)
1296 bcopy(hdr, mtod(m, caddr_t), hlen);
1297
1298 *mp = m;
1299 return (0);
1300 }
1301
1302 /*
1303 * Insert fragment header and copy unfragmentable header portions.
1304 */
1305 static int
ip6_insertfraghdr(struct mbuf * m0,struct mbuf * m,int hlen,struct ip6_frag ** frghdrp)1306 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1307 struct ip6_frag **frghdrp)
1308 {
1309 struct mbuf *n, *mlast;
1310
1311 if (hlen > sizeof(struct ip6_hdr)) {
1312 n = m_copym(m0, sizeof(struct ip6_hdr),
1313 hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1314 if (n == NULL)
1315 return (ENOBUFS);
1316 m->m_next = n;
1317 } else
1318 n = m;
1319
1320 /* Search for the last mbuf of unfragmentable part. */
1321 for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1322 ;
1323
1324 if (M_WRITABLE(mlast) &&
1325 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1326 /* use the trailing space of the last mbuf for the fragment hdr */
1327 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1328 mlast->m_len);
1329 mlast->m_len += sizeof(struct ip6_frag);
1330 m->m_pkthdr.len += sizeof(struct ip6_frag);
1331 } else {
1332 /* allocate a new mbuf for the fragment header */
1333 struct mbuf *mfrg;
1334
1335 mfrg = m_get(M_NOWAIT, MT_DATA);
1336 if (mfrg == NULL)
1337 return (ENOBUFS);
1338 mfrg->m_len = sizeof(struct ip6_frag);
1339 *frghdrp = mtod(mfrg, struct ip6_frag *);
1340 mlast->m_next = mfrg;
1341 }
1342
1343 return (0);
1344 }
1345
1346 /*
1347 * Calculates IPv6 path mtu for destination @dst.
1348 * Resulting MTU is stored in @mtup.
1349 *
1350 * Returns 0 on success.
1351 */
1352 static int
ip6_getpmtu_ctl(u_int fibnum,const struct in6_addr * dst,u_long * mtup)1353 ip6_getpmtu_ctl(u_int fibnum, const struct in6_addr *dst, u_long *mtup)
1354 {
1355 struct epoch_tracker et;
1356 struct nhop_object *nh;
1357 struct in6_addr kdst;
1358 uint32_t scopeid;
1359 int error;
1360
1361 in6_splitscope(dst, &kdst, &scopeid);
1362
1363 NET_EPOCH_ENTER(et);
1364 nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0);
1365 if (nh != NULL) {
1366 ip6_calcmtu(nh->nh_ifp, dst, nh->nh_mtu, mtup, 0);
1367 error = 0;
1368 } else
1369 error = EHOSTUNREACH;
1370 NET_EPOCH_EXIT(et);
1371
1372 return (error);
1373 }
1374
1375 /*
1376 * Calculates IPv6 path MTU for @dst based on transmit @ifp,
1377 * and cached data in @ro_pmtu.
1378 * MTU from (successful) route lookup is saved (along with dst)
1379 * inside @ro_pmtu to avoid subsequent route lookups after packet
1380 * filter processing.
1381 *
1382 * Stores mtu into @mtup.
1383 */
1384 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)1385 ip6_getpmtu(struct route_in6 *ro_pmtu, int do_lookup,
1386 struct ifnet *ifp, const struct in6_addr *dst, u_long *mtup,
1387 u_int fibnum, u_int proto)
1388 {
1389 struct nhop_object *nh;
1390 struct in6_addr kdst;
1391 uint32_t scopeid;
1392 struct sockaddr_in6 *sa6_dst, sin6;
1393 u_long mtu;
1394
1395 NET_EPOCH_ASSERT();
1396
1397 mtu = 0;
1398 if (ro_pmtu == NULL || do_lookup) {
1399 /*
1400 * Here ro_pmtu has final destination address, while
1401 * ro might represent immediate destination.
1402 * Use ro_pmtu destination since mtu might differ.
1403 */
1404 if (ro_pmtu != NULL) {
1405 sa6_dst = (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1406 if (!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))
1407 ro_pmtu->ro_mtu = 0;
1408 } else
1409 sa6_dst = &sin6;
1410
1411 if (ro_pmtu == NULL || ro_pmtu->ro_mtu == 0) {
1412 bzero(sa6_dst, sizeof(*sa6_dst));
1413 sa6_dst->sin6_family = AF_INET6;
1414 sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1415 sa6_dst->sin6_addr = *dst;
1416
1417 in6_splitscope(dst, &kdst, &scopeid);
1418 nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0);
1419 if (nh != NULL) {
1420 mtu = nh->nh_mtu;
1421 if (ro_pmtu != NULL)
1422 ro_pmtu->ro_mtu = mtu;
1423 }
1424 } else
1425 mtu = ro_pmtu->ro_mtu;
1426 }
1427
1428 if (ro_pmtu != NULL && ro_pmtu->ro_nh != NULL)
1429 mtu = ro_pmtu->ro_nh->nh_mtu;
1430
1431 ip6_calcmtu(ifp, dst, mtu, mtup, proto);
1432 }
1433
1434 /*
1435 * Calculate MTU based on transmit @ifp, route mtu @rt_mtu and
1436 * hostcache data for @dst.
1437 * Stores mtu into @mtup.
1438 */
1439 static void
ip6_calcmtu(struct ifnet * ifp,const struct in6_addr * dst,u_long rt_mtu,u_long * mtup,u_int proto)1440 ip6_calcmtu(struct ifnet *ifp, const struct in6_addr *dst, u_long rt_mtu,
1441 u_long *mtup, u_int proto)
1442 {
1443 u_long mtu = 0;
1444
1445 if (rt_mtu > 0) {
1446 /* Skip the hostcache if the protocol handles PMTU changes. */
1447 if (proto != IPPROTO_TCP && proto != IPPROTO_SCTP) {
1448 struct in_conninfo inc = {
1449 .inc_flags = INC_ISIPV6,
1450 .inc6_faddr = *dst,
1451 };
1452
1453 mtu = tcp_hc_getmtu(&inc);
1454 }
1455
1456 if (mtu)
1457 mtu = min(mtu, rt_mtu);
1458 else
1459 mtu = rt_mtu;
1460 }
1461
1462 if (mtu == 0)
1463 mtu = in6_ifmtu(ifp);
1464
1465 *mtup = mtu;
1466 }
1467
1468 /*
1469 * IP6 socket option processing.
1470 */
1471 int
ip6_ctloutput(struct socket * so,struct sockopt * sopt)1472 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1473 {
1474 int optdatalen, uproto;
1475 void *optdata;
1476 struct inpcb *inp = sotoinpcb(so);
1477 int error, optval;
1478 int level, op, optname;
1479 int optlen;
1480 struct thread *td;
1481 #ifdef RSS
1482 uint32_t rss_bucket;
1483 int retval;
1484 #endif
1485
1486 /*
1487 * Don't use more than a quarter of mbuf clusters. N.B.:
1488 * nmbclusters is an int, but nmbclusters * MCLBYTES may overflow
1489 * on LP64 architectures, so cast to u_long to avoid undefined
1490 * behavior. ILP32 architectures cannot have nmbclusters
1491 * large enough to overflow for other reasons.
1492 */
1493 #define IPV6_PKTOPTIONS_MBUF_LIMIT ((u_long)nmbclusters * MCLBYTES / 4)
1494
1495 level = sopt->sopt_level;
1496 op = sopt->sopt_dir;
1497 optname = sopt->sopt_name;
1498 optlen = sopt->sopt_valsize;
1499 td = sopt->sopt_td;
1500 error = 0;
1501 optval = 0;
1502 uproto = (int)so->so_proto->pr_protocol;
1503
1504 if (level != IPPROTO_IPV6) {
1505 error = EINVAL;
1506
1507 if (sopt->sopt_level == SOL_SOCKET &&
1508 sopt->sopt_dir == SOPT_SET) {
1509 switch (sopt->sopt_name) {
1510 case SO_SETFIB:
1511 error = sooptcopyin(sopt, &optval,
1512 sizeof(optval), sizeof(optval));
1513 if (error != 0)
1514 break;
1515
1516 INP_WLOCK(inp);
1517 if ((inp->inp_flags & INP_BOUNDFIB) != 0 &&
1518 optval != so->so_fibnum) {
1519 INP_WUNLOCK(inp);
1520 error = EISCONN;
1521 break;
1522 }
1523 error = sosetfib(inp->inp_socket, optval);
1524 if (error == 0)
1525 inp->inp_inc.inc_fibnum = optval;
1526 INP_WUNLOCK(inp);
1527 break;
1528 case SO_MAX_PACING_RATE:
1529 #ifdef RATELIMIT
1530 INP_WLOCK(inp);
1531 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1532 INP_WUNLOCK(inp);
1533 error = 0;
1534 #else
1535 error = EOPNOTSUPP;
1536 #endif
1537 break;
1538 default:
1539 break;
1540 }
1541 }
1542 } else { /* level == IPPROTO_IPV6 */
1543 switch (op) {
1544 case SOPT_SET:
1545 switch (optname) {
1546 case IPV6_2292PKTOPTIONS:
1547 #ifdef IPV6_PKTOPTIONS
1548 case IPV6_PKTOPTIONS:
1549 #endif
1550 {
1551 struct mbuf *m;
1552
1553 if (optlen > IPV6_PKTOPTIONS_MBUF_LIMIT) {
1554 printf("ip6_ctloutput: mbuf limit hit\n");
1555 error = ENOBUFS;
1556 break;
1557 }
1558
1559 error = soopt_getm(sopt, &m); /* XXX */
1560 if (error != 0)
1561 break;
1562 error = soopt_mcopyin(sopt, m); /* XXX */
1563 if (error != 0)
1564 break;
1565 INP_WLOCK(inp);
1566 error = ip6_pcbopts(&inp->in6p_outputopts, m,
1567 so, sopt);
1568 INP_WUNLOCK(inp);
1569 m_freem(m); /* XXX */
1570 break;
1571 }
1572
1573 /*
1574 * Use of some Hop-by-Hop options or some
1575 * Destination options, might require special
1576 * privilege. That is, normal applications
1577 * (without special privilege) might be forbidden
1578 * from setting certain options in outgoing packets,
1579 * and might never see certain options in received
1580 * packets. [RFC 2292 Section 6]
1581 * KAME specific note:
1582 * KAME prevents non-privileged users from sending or
1583 * receiving ANY hbh/dst options in order to avoid
1584 * overhead of parsing options in the kernel.
1585 */
1586 case IPV6_RECVHOPOPTS:
1587 case IPV6_RECVDSTOPTS:
1588 case IPV6_RECVRTHDRDSTOPTS:
1589 if (td != NULL) {
1590 error = priv_check(td,
1591 PRIV_NETINET_SETHDROPTS);
1592 if (error)
1593 break;
1594 }
1595 /* FALLTHROUGH */
1596 case IPV6_UNICAST_HOPS:
1597 case IPV6_HOPLIMIT:
1598
1599 case IPV6_RECVPKTINFO:
1600 case IPV6_RECVHOPLIMIT:
1601 case IPV6_RECVRTHDR:
1602 case IPV6_RECVPATHMTU:
1603 case IPV6_RECVTCLASS:
1604 case IPV6_RECVFLOWID:
1605 #ifdef RSS
1606 case IPV6_RECVRSSBUCKETID:
1607 #endif
1608 case IPV6_V6ONLY:
1609 case IPV6_AUTOFLOWLABEL:
1610 case IPV6_ORIGDSTADDR:
1611 case IPV6_BINDANY:
1612 case IPV6_VLAN_PCP:
1613 if (optname == IPV6_BINDANY && td != NULL) {
1614 error = priv_check(td,
1615 PRIV_NETINET_BINDANY);
1616 if (error)
1617 break;
1618 }
1619
1620 if (optlen != sizeof(int)) {
1621 error = EINVAL;
1622 break;
1623 }
1624 error = sooptcopyin(sopt, &optval,
1625 sizeof optval, sizeof optval);
1626 if (error)
1627 break;
1628 switch (optname) {
1629 case IPV6_UNICAST_HOPS:
1630 if (optval < -1 || optval >= 256)
1631 error = EINVAL;
1632 else {
1633 /* -1 = kernel default */
1634 inp->in6p_hops = optval;
1635 if ((inp->inp_vflag &
1636 INP_IPV4) != 0)
1637 inp->inp_ip_ttl = optval;
1638 }
1639 break;
1640 #define OPTSET(bit) \
1641 do { \
1642 INP_WLOCK(inp); \
1643 if (optval) \
1644 inp->inp_flags |= (bit); \
1645 else \
1646 inp->inp_flags &= ~(bit); \
1647 INP_WUNLOCK(inp); \
1648 } while (/*CONSTCOND*/ 0)
1649 #define OPTSET2292(bit) \
1650 do { \
1651 INP_WLOCK(inp); \
1652 inp->inp_flags |= IN6P_RFC2292; \
1653 if (optval) \
1654 inp->inp_flags |= (bit); \
1655 else \
1656 inp->inp_flags &= ~(bit); \
1657 INP_WUNLOCK(inp); \
1658 } while (/*CONSTCOND*/ 0)
1659 #define OPTBIT(bit) (inp->inp_flags & (bit) ? 1 : 0)
1660
1661 #define OPTSET2_N(bit, val) do { \
1662 if (val) \
1663 inp->inp_flags2 |= bit; \
1664 else \
1665 inp->inp_flags2 &= ~bit; \
1666 } while (0)
1667 #define OPTSET2(bit, val) do { \
1668 INP_WLOCK(inp); \
1669 OPTSET2_N(bit, val); \
1670 INP_WUNLOCK(inp); \
1671 } while (0)
1672 #define OPTBIT2(bit) (inp->inp_flags2 & (bit) ? 1 : 0)
1673 #define OPTSET2292_EXCLUSIVE(bit) \
1674 do { \
1675 INP_WLOCK(inp); \
1676 if (OPTBIT(IN6P_RFC2292)) { \
1677 error = EINVAL; \
1678 } else { \
1679 if (optval) \
1680 inp->inp_flags |= (bit); \
1681 else \
1682 inp->inp_flags &= ~(bit); \
1683 } \
1684 INP_WUNLOCK(inp); \
1685 } while (/*CONSTCOND*/ 0)
1686
1687 case IPV6_RECVPKTINFO:
1688 OPTSET2292_EXCLUSIVE(IN6P_PKTINFO);
1689 break;
1690
1691 case IPV6_HOPLIMIT:
1692 {
1693 struct ip6_pktopts **optp;
1694
1695 /* cannot mix with RFC2292 */
1696 if (OPTBIT(IN6P_RFC2292)) {
1697 error = EINVAL;
1698 break;
1699 }
1700 INP_WLOCK(inp);
1701 optp = &inp->in6p_outputopts;
1702 error = ip6_pcbopt(IPV6_HOPLIMIT,
1703 (u_char *)&optval, sizeof(optval),
1704 optp, (td != NULL) ? td->td_ucred :
1705 NULL, uproto);
1706 INP_WUNLOCK(inp);
1707 break;
1708 }
1709
1710 case IPV6_RECVHOPLIMIT:
1711 OPTSET2292_EXCLUSIVE(IN6P_HOPLIMIT);
1712 break;
1713
1714 case IPV6_RECVHOPOPTS:
1715 OPTSET2292_EXCLUSIVE(IN6P_HOPOPTS);
1716 break;
1717
1718 case IPV6_RECVDSTOPTS:
1719 OPTSET2292_EXCLUSIVE(IN6P_DSTOPTS);
1720 break;
1721
1722 case IPV6_RECVRTHDRDSTOPTS:
1723 OPTSET2292_EXCLUSIVE(IN6P_RTHDRDSTOPTS);
1724 break;
1725
1726 case IPV6_RECVRTHDR:
1727 OPTSET2292_EXCLUSIVE(IN6P_RTHDR);
1728 break;
1729
1730 case IPV6_RECVPATHMTU:
1731 /*
1732 * We ignore this option for TCP
1733 * sockets.
1734 * (RFC3542 leaves this case
1735 * unspecified.)
1736 */
1737 if (uproto != IPPROTO_TCP)
1738 OPTSET(IN6P_MTU);
1739 break;
1740
1741 case IPV6_RECVFLOWID:
1742 OPTSET2(INP_RECVFLOWID, optval);
1743 break;
1744
1745 #ifdef RSS
1746 case IPV6_RECVRSSBUCKETID:
1747 OPTSET2(INP_RECVRSSBUCKETID, optval);
1748 break;
1749 #endif
1750
1751 case IPV6_V6ONLY:
1752 INP_WLOCK(inp);
1753 if (inp->inp_lport ||
1754 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1755 /*
1756 * The socket is already bound.
1757 */
1758 INP_WUNLOCK(inp);
1759 error = EINVAL;
1760 break;
1761 }
1762 if (optval) {
1763 inp->inp_flags |= IN6P_IPV6_V6ONLY;
1764 inp->inp_vflag &= ~INP_IPV4;
1765 } else {
1766 inp->inp_flags &= ~IN6P_IPV6_V6ONLY;
1767 inp->inp_vflag |= INP_IPV4;
1768 }
1769 INP_WUNLOCK(inp);
1770 break;
1771 case IPV6_RECVTCLASS:
1772 /* cannot mix with RFC2292 XXX */
1773 OPTSET2292_EXCLUSIVE(IN6P_TCLASS);
1774 break;
1775 case IPV6_AUTOFLOWLABEL:
1776 OPTSET(IN6P_AUTOFLOWLABEL);
1777 break;
1778
1779 case IPV6_ORIGDSTADDR:
1780 OPTSET2(INP_ORIGDSTADDR, optval);
1781 break;
1782 case IPV6_BINDANY:
1783 OPTSET(INP_BINDANY);
1784 break;
1785 case IPV6_VLAN_PCP:
1786 if ((optval >= -1) && (optval <=
1787 (INP_2PCP_MASK >> INP_2PCP_SHIFT))) {
1788 if (optval == -1) {
1789 INP_WLOCK(inp);
1790 inp->inp_flags2 &=
1791 ~(INP_2PCP_SET |
1792 INP_2PCP_MASK);
1793 INP_WUNLOCK(inp);
1794 } else {
1795 INP_WLOCK(inp);
1796 inp->inp_flags2 |=
1797 INP_2PCP_SET;
1798 inp->inp_flags2 &=
1799 ~INP_2PCP_MASK;
1800 inp->inp_flags2 |=
1801 optval <<
1802 INP_2PCP_SHIFT;
1803 INP_WUNLOCK(inp);
1804 }
1805 } else
1806 error = EINVAL;
1807 break;
1808 }
1809 break;
1810
1811 case IPV6_TCLASS:
1812 case IPV6_DONTFRAG:
1813 case IPV6_USE_MIN_MTU:
1814 case IPV6_PREFER_TEMPADDR:
1815 if (optlen != sizeof(optval)) {
1816 error = EINVAL;
1817 break;
1818 }
1819 error = sooptcopyin(sopt, &optval,
1820 sizeof optval, sizeof optval);
1821 if (error)
1822 break;
1823 {
1824 struct ip6_pktopts **optp;
1825 INP_WLOCK(inp);
1826 optp = &inp->in6p_outputopts;
1827 error = ip6_pcbopt(optname,
1828 (u_char *)&optval, sizeof(optval),
1829 optp, (td != NULL) ? td->td_ucred :
1830 NULL, uproto);
1831 INP_WUNLOCK(inp);
1832 break;
1833 }
1834
1835 case IPV6_2292PKTINFO:
1836 case IPV6_2292HOPLIMIT:
1837 case IPV6_2292HOPOPTS:
1838 case IPV6_2292DSTOPTS:
1839 case IPV6_2292RTHDR:
1840 /* RFC 2292 */
1841 if (optlen != sizeof(int)) {
1842 error = EINVAL;
1843 break;
1844 }
1845 error = sooptcopyin(sopt, &optval,
1846 sizeof optval, sizeof optval);
1847 if (error)
1848 break;
1849 switch (optname) {
1850 case IPV6_2292PKTINFO:
1851 OPTSET2292(IN6P_PKTINFO);
1852 break;
1853 case IPV6_2292HOPLIMIT:
1854 OPTSET2292(IN6P_HOPLIMIT);
1855 break;
1856 case IPV6_2292HOPOPTS:
1857 /*
1858 * Check super-user privilege.
1859 * See comments for IPV6_RECVHOPOPTS.
1860 */
1861 if (td != NULL) {
1862 error = priv_check(td,
1863 PRIV_NETINET_SETHDROPTS);
1864 if (error)
1865 return (error);
1866 }
1867 OPTSET2292(IN6P_HOPOPTS);
1868 break;
1869 case IPV6_2292DSTOPTS:
1870 if (td != NULL) {
1871 error = priv_check(td,
1872 PRIV_NETINET_SETHDROPTS);
1873 if (error)
1874 return (error);
1875 }
1876 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1877 break;
1878 case IPV6_2292RTHDR:
1879 OPTSET2292(IN6P_RTHDR);
1880 break;
1881 }
1882 break;
1883 case IPV6_PKTINFO:
1884 case IPV6_HOPOPTS:
1885 case IPV6_RTHDR:
1886 case IPV6_DSTOPTS:
1887 case IPV6_RTHDRDSTOPTS:
1888 case IPV6_NEXTHOP:
1889 {
1890 /* new advanced API (RFC3542) */
1891 u_char *optbuf;
1892 u_char optbuf_storage[MCLBYTES];
1893 int optlen;
1894 struct ip6_pktopts **optp;
1895
1896 /* cannot mix with RFC2292 */
1897 if (OPTBIT(IN6P_RFC2292)) {
1898 error = EINVAL;
1899 break;
1900 }
1901
1902 /*
1903 * We only ensure valsize is not too large
1904 * here. Further validation will be done
1905 * later.
1906 */
1907 error = sooptcopyin(sopt, optbuf_storage,
1908 sizeof(optbuf_storage), 0);
1909 if (error)
1910 break;
1911 optlen = sopt->sopt_valsize;
1912 optbuf = optbuf_storage;
1913 INP_WLOCK(inp);
1914 optp = &inp->in6p_outputopts;
1915 error = ip6_pcbopt(optname, optbuf, optlen,
1916 optp, (td != NULL) ? td->td_ucred : NULL,
1917 uproto);
1918 INP_WUNLOCK(inp);
1919 break;
1920 }
1921 #undef OPTSET
1922
1923 case IPV6_MULTICAST_IF:
1924 case IPV6_MULTICAST_HOPS:
1925 case IPV6_MULTICAST_LOOP:
1926 case IPV6_JOIN_GROUP:
1927 case IPV6_LEAVE_GROUP:
1928 case IPV6_MSFILTER:
1929 case MCAST_BLOCK_SOURCE:
1930 case MCAST_UNBLOCK_SOURCE:
1931 case MCAST_JOIN_GROUP:
1932 case MCAST_LEAVE_GROUP:
1933 case MCAST_JOIN_SOURCE_GROUP:
1934 case MCAST_LEAVE_SOURCE_GROUP:
1935 error = ip6_setmoptions(inp, sopt);
1936 break;
1937
1938 case IPV6_PORTRANGE:
1939 error = sooptcopyin(sopt, &optval,
1940 sizeof optval, sizeof optval);
1941 if (error)
1942 break;
1943
1944 INP_WLOCK(inp);
1945 switch (optval) {
1946 case IPV6_PORTRANGE_DEFAULT:
1947 inp->inp_flags &= ~(INP_LOWPORT);
1948 inp->inp_flags &= ~(INP_HIGHPORT);
1949 break;
1950
1951 case IPV6_PORTRANGE_HIGH:
1952 inp->inp_flags &= ~(INP_LOWPORT);
1953 inp->inp_flags |= INP_HIGHPORT;
1954 break;
1955
1956 case IPV6_PORTRANGE_LOW:
1957 inp->inp_flags &= ~(INP_HIGHPORT);
1958 inp->inp_flags |= INP_LOWPORT;
1959 break;
1960
1961 default:
1962 error = EINVAL;
1963 break;
1964 }
1965 INP_WUNLOCK(inp);
1966 break;
1967
1968 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1969 case IPV6_IPSEC_POLICY:
1970 if (IPSEC_ENABLED(ipv6)) {
1971 error = IPSEC_PCBCTL(ipv6, inp, sopt);
1972 break;
1973 }
1974 /* FALLTHROUGH */
1975 #endif /* IPSEC */
1976
1977 default:
1978 error = ENOPROTOOPT;
1979 break;
1980 }
1981 break;
1982
1983 case SOPT_GET:
1984 switch (optname) {
1985 case IPV6_2292PKTOPTIONS:
1986 #ifdef IPV6_PKTOPTIONS
1987 case IPV6_PKTOPTIONS:
1988 #endif
1989 /*
1990 * RFC3542 (effectively) deprecated the
1991 * semantics of the 2292-style pktoptions.
1992 * Since it was not reliable in nature (i.e.,
1993 * applications had to expect the lack of some
1994 * information after all), it would make sense
1995 * to simplify this part by always returning
1996 * empty data.
1997 */
1998 sopt->sopt_valsize = 0;
1999 break;
2000
2001 case IPV6_RECVHOPOPTS:
2002 case IPV6_RECVDSTOPTS:
2003 case IPV6_RECVRTHDRDSTOPTS:
2004 case IPV6_UNICAST_HOPS:
2005 case IPV6_RECVPKTINFO:
2006 case IPV6_RECVHOPLIMIT:
2007 case IPV6_RECVRTHDR:
2008 case IPV6_RECVPATHMTU:
2009
2010 case IPV6_V6ONLY:
2011 case IPV6_PORTRANGE:
2012 case IPV6_RECVTCLASS:
2013 case IPV6_AUTOFLOWLABEL:
2014 case IPV6_BINDANY:
2015 case IPV6_FLOWID:
2016 case IPV6_FLOWTYPE:
2017 case IPV6_RECVFLOWID:
2018 #ifdef RSS
2019 case IPV6_RSSBUCKETID:
2020 case IPV6_RECVRSSBUCKETID:
2021 #endif
2022 case IPV6_VLAN_PCP:
2023 switch (optname) {
2024 case IPV6_RECVHOPOPTS:
2025 optval = OPTBIT(IN6P_HOPOPTS);
2026 break;
2027
2028 case IPV6_RECVDSTOPTS:
2029 optval = OPTBIT(IN6P_DSTOPTS);
2030 break;
2031
2032 case IPV6_RECVRTHDRDSTOPTS:
2033 optval = OPTBIT(IN6P_RTHDRDSTOPTS);
2034 break;
2035
2036 case IPV6_UNICAST_HOPS:
2037 optval = inp->in6p_hops;
2038 break;
2039
2040 case IPV6_RECVPKTINFO:
2041 optval = OPTBIT(IN6P_PKTINFO);
2042 break;
2043
2044 case IPV6_RECVHOPLIMIT:
2045 optval = OPTBIT(IN6P_HOPLIMIT);
2046 break;
2047
2048 case IPV6_RECVRTHDR:
2049 optval = OPTBIT(IN6P_RTHDR);
2050 break;
2051
2052 case IPV6_RECVPATHMTU:
2053 optval = OPTBIT(IN6P_MTU);
2054 break;
2055
2056 case IPV6_V6ONLY:
2057 optval = OPTBIT(IN6P_IPV6_V6ONLY);
2058 break;
2059
2060 case IPV6_PORTRANGE:
2061 {
2062 int flags;
2063 flags = inp->inp_flags;
2064 if (flags & INP_HIGHPORT)
2065 optval = IPV6_PORTRANGE_HIGH;
2066 else if (flags & INP_LOWPORT)
2067 optval = IPV6_PORTRANGE_LOW;
2068 else
2069 optval = 0;
2070 break;
2071 }
2072 case IPV6_RECVTCLASS:
2073 optval = OPTBIT(IN6P_TCLASS);
2074 break;
2075
2076 case IPV6_AUTOFLOWLABEL:
2077 optval = OPTBIT(IN6P_AUTOFLOWLABEL);
2078 break;
2079
2080 case IPV6_ORIGDSTADDR:
2081 optval = OPTBIT2(INP_ORIGDSTADDR);
2082 break;
2083
2084 case IPV6_BINDANY:
2085 optval = OPTBIT(INP_BINDANY);
2086 break;
2087
2088 case IPV6_FLOWID:
2089 optval = inp->inp_flowid;
2090 break;
2091
2092 case IPV6_FLOWTYPE:
2093 optval = inp->inp_flowtype;
2094 break;
2095
2096 case IPV6_RECVFLOWID:
2097 optval = OPTBIT2(INP_RECVFLOWID);
2098 break;
2099 #ifdef RSS
2100 case IPV6_RSSBUCKETID:
2101 retval =
2102 rss_hash2bucket(inp->inp_flowid,
2103 inp->inp_flowtype,
2104 &rss_bucket);
2105 if (retval == 0)
2106 optval = rss_bucket;
2107 else
2108 error = EINVAL;
2109 break;
2110
2111 case IPV6_RECVRSSBUCKETID:
2112 optval = OPTBIT2(INP_RECVRSSBUCKETID);
2113 break;
2114 #endif
2115
2116
2117 case IPV6_VLAN_PCP:
2118 if (OPTBIT2(INP_2PCP_SET)) {
2119 optval = (inp->inp_flags2 &
2120 INP_2PCP_MASK) >>
2121 INP_2PCP_SHIFT;
2122 } else {
2123 optval = -1;
2124 }
2125 break;
2126 }
2127
2128 if (error)
2129 break;
2130 error = sooptcopyout(sopt, &optval,
2131 sizeof optval);
2132 break;
2133
2134 case IPV6_PATHMTU:
2135 {
2136 u_long pmtu = 0;
2137 struct ip6_mtuinfo mtuinfo;
2138 struct in6_addr addr;
2139
2140 if (!(so->so_state & SS_ISCONNECTED))
2141 return (ENOTCONN);
2142 /*
2143 * XXX: we dot not consider the case of source
2144 * routing, or optional information to specify
2145 * the outgoing interface.
2146 * Copy faddr out of inp to avoid holding lock
2147 * on inp during route lookup.
2148 */
2149 INP_RLOCK(inp);
2150 bcopy(&inp->in6p_faddr, &addr, sizeof(addr));
2151 INP_RUNLOCK(inp);
2152 error = ip6_getpmtu_ctl(so->so_fibnum,
2153 &addr, &pmtu);
2154 if (error)
2155 break;
2156 if (pmtu > IPV6_MAXPACKET)
2157 pmtu = IPV6_MAXPACKET;
2158
2159 bzero(&mtuinfo, sizeof(mtuinfo));
2160 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
2161 optdata = (void *)&mtuinfo;
2162 optdatalen = sizeof(mtuinfo);
2163 error = sooptcopyout(sopt, optdata,
2164 optdatalen);
2165 break;
2166 }
2167
2168 case IPV6_2292PKTINFO:
2169 case IPV6_2292HOPLIMIT:
2170 case IPV6_2292HOPOPTS:
2171 case IPV6_2292RTHDR:
2172 case IPV6_2292DSTOPTS:
2173 switch (optname) {
2174 case IPV6_2292PKTINFO:
2175 optval = OPTBIT(IN6P_PKTINFO);
2176 break;
2177 case IPV6_2292HOPLIMIT:
2178 optval = OPTBIT(IN6P_HOPLIMIT);
2179 break;
2180 case IPV6_2292HOPOPTS:
2181 optval = OPTBIT(IN6P_HOPOPTS);
2182 break;
2183 case IPV6_2292RTHDR:
2184 optval = OPTBIT(IN6P_RTHDR);
2185 break;
2186 case IPV6_2292DSTOPTS:
2187 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
2188 break;
2189 }
2190 error = sooptcopyout(sopt, &optval,
2191 sizeof optval);
2192 break;
2193 case IPV6_PKTINFO:
2194 case IPV6_HOPOPTS:
2195 case IPV6_RTHDR:
2196 case IPV6_DSTOPTS:
2197 case IPV6_RTHDRDSTOPTS:
2198 case IPV6_NEXTHOP:
2199 case IPV6_TCLASS:
2200 case IPV6_DONTFRAG:
2201 case IPV6_USE_MIN_MTU:
2202 case IPV6_PREFER_TEMPADDR:
2203 error = ip6_getpcbopt(inp, optname, sopt);
2204 break;
2205
2206 case IPV6_MULTICAST_IF:
2207 case IPV6_MULTICAST_HOPS:
2208 case IPV6_MULTICAST_LOOP:
2209 case IPV6_MSFILTER:
2210 error = ip6_getmoptions(inp, sopt);
2211 break;
2212
2213 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
2214 case IPV6_IPSEC_POLICY:
2215 if (IPSEC_ENABLED(ipv6)) {
2216 error = IPSEC_PCBCTL(ipv6, inp, sopt);
2217 break;
2218 }
2219 /* FALLTHROUGH */
2220 #endif /* IPSEC */
2221 default:
2222 error = ENOPROTOOPT;
2223 break;
2224 }
2225 break;
2226 }
2227 }
2228 return (error);
2229 }
2230
2231 int
ip6_raw_ctloutput(struct socket * so,struct sockopt * sopt)2232 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2233 {
2234 int error = 0, optval, optlen;
2235 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2236 struct inpcb *inp = sotoinpcb(so);
2237 int level, op, optname;
2238
2239 level = sopt->sopt_level;
2240 op = sopt->sopt_dir;
2241 optname = sopt->sopt_name;
2242 optlen = sopt->sopt_valsize;
2243
2244 if (level != IPPROTO_IPV6) {
2245 return (EINVAL);
2246 }
2247
2248 switch (optname) {
2249 case IPV6_CHECKSUM:
2250 /*
2251 * For ICMPv6 sockets, no modification allowed for checksum
2252 * offset, permit "no change" values to help existing apps.
2253 *
2254 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2255 * for an ICMPv6 socket will fail."
2256 * The current behavior does not meet RFC3542.
2257 */
2258 switch (op) {
2259 case SOPT_SET:
2260 if (optlen != sizeof(int)) {
2261 error = EINVAL;
2262 break;
2263 }
2264 error = sooptcopyin(sopt, &optval, sizeof(optval),
2265 sizeof(optval));
2266 if (error)
2267 break;
2268 if (optval < -1 || (optval % 2) != 0) {
2269 /*
2270 * The API assumes non-negative even offset
2271 * values or -1 as a special value.
2272 */
2273 error = EINVAL;
2274 } else if (inp->inp_ip_p == IPPROTO_ICMPV6) {
2275 if (optval != icmp6off)
2276 error = EINVAL;
2277 } else
2278 inp->in6p_cksum = optval;
2279 break;
2280
2281 case SOPT_GET:
2282 if (inp->inp_ip_p == IPPROTO_ICMPV6)
2283 optval = icmp6off;
2284 else
2285 optval = inp->in6p_cksum;
2286
2287 error = sooptcopyout(sopt, &optval, sizeof(optval));
2288 break;
2289
2290 default:
2291 error = EINVAL;
2292 break;
2293 }
2294 break;
2295
2296 default:
2297 error = ENOPROTOOPT;
2298 break;
2299 }
2300
2301 return (error);
2302 }
2303
2304 /*
2305 * Set up IP6 options in pcb for insertion in output packets or
2306 * specifying behavior of outgoing packets.
2307 */
2308 static int
ip6_pcbopts(struct ip6_pktopts ** pktopt,struct mbuf * m,struct socket * so,struct sockopt * sopt)2309 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2310 struct socket *so, struct sockopt *sopt)
2311 {
2312 struct ip6_pktopts *opt = *pktopt;
2313 int error = 0;
2314 struct thread *td = sopt->sopt_td;
2315 struct epoch_tracker et;
2316
2317 /* turn off any old options. */
2318 if (opt) {
2319 #ifdef DIAGNOSTIC
2320 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2321 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2322 opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2323 printf("ip6_pcbopts: all specified options are cleared.\n");
2324 #endif
2325 ip6_clearpktopts(opt, -1);
2326 } else {
2327 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT);
2328 if (opt == NULL)
2329 return (ENOMEM);
2330 }
2331 *pktopt = NULL;
2332
2333 if (!m || m->m_len == 0) {
2334 /*
2335 * Only turning off any previous options, regardless of
2336 * whether the opt is just created or given.
2337 */
2338 free(opt, M_IP6OPT);
2339 return (0);
2340 }
2341
2342 /* set options specified by user. */
2343 NET_EPOCH_ENTER(et);
2344 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2345 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2346 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2347 free(opt, M_IP6OPT);
2348 NET_EPOCH_EXIT(et);
2349 return (error);
2350 }
2351 NET_EPOCH_EXIT(et);
2352 *pktopt = opt;
2353 return (0);
2354 }
2355
2356 /*
2357 * initialize ip6_pktopts. beware that there are non-zero default values in
2358 * the struct.
2359 */
2360 void
ip6_initpktopts(struct ip6_pktopts * opt)2361 ip6_initpktopts(struct ip6_pktopts *opt)
2362 {
2363
2364 bzero(opt, sizeof(*opt));
2365 opt->ip6po_hlim = -1; /* -1 means default hop limit */
2366 opt->ip6po_tclass = -1; /* -1 means default traffic class */
2367 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2368 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2369 }
2370
2371 static int
ip6_pcbopt(int optname,u_char * buf,int len,struct ip6_pktopts ** pktopt,struct ucred * cred,int uproto)2372 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2373 struct ucred *cred, int uproto)
2374 {
2375 struct epoch_tracker et;
2376 struct ip6_pktopts *opt;
2377 int ret;
2378
2379 if (*pktopt == NULL) {
2380 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2381 M_NOWAIT);
2382 if (*pktopt == NULL)
2383 return (ENOBUFS);
2384 ip6_initpktopts(*pktopt);
2385 }
2386 opt = *pktopt;
2387
2388 NET_EPOCH_ENTER(et);
2389 ret = ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto);
2390 NET_EPOCH_EXIT(et);
2391
2392 return (ret);
2393 }
2394
2395 #define GET_PKTOPT_VAR(field, lenexpr) do { \
2396 if (pktopt && pktopt->field) { \
2397 INP_RUNLOCK(inp); \
2398 optdata = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK); \
2399 malloc_optdata = true; \
2400 INP_RLOCK(inp); \
2401 pktopt = inp->in6p_outputopts; \
2402 if (pktopt && pktopt->field) { \
2403 optdatalen = min(lenexpr, sopt->sopt_valsize); \
2404 bcopy(pktopt->field, optdata, optdatalen); \
2405 } else { \
2406 free(optdata, M_TEMP); \
2407 optdata = NULL; \
2408 malloc_optdata = false; \
2409 } \
2410 } \
2411 } while(0)
2412
2413 #define GET_PKTOPT_EXT_HDR(field) GET_PKTOPT_VAR(field, \
2414 (((struct ip6_ext *)pktopt->field)->ip6e_len + 1) << 3)
2415
2416 #define GET_PKTOPT_SOCKADDR(field) GET_PKTOPT_VAR(field, \
2417 pktopt->field->sa_len)
2418
2419 static int
ip6_getpcbopt(struct inpcb * inp,int optname,struct sockopt * sopt)2420 ip6_getpcbopt(struct inpcb *inp, int optname, struct sockopt *sopt)
2421 {
2422 void *optdata = NULL;
2423 bool malloc_optdata = false;
2424 int optdatalen = 0;
2425 int error = 0;
2426 struct in6_pktinfo null_pktinfo;
2427 int deftclass = 0, on;
2428 int defminmtu = IP6PO_MINMTU_MCASTONLY;
2429 int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2430 struct ip6_pktopts *pktopt;
2431
2432 INP_RLOCK(inp);
2433 pktopt = inp->in6p_outputopts;
2434
2435 switch (optname) {
2436 case IPV6_PKTINFO:
2437 optdata = (void *)&null_pktinfo;
2438 if (pktopt && pktopt->ip6po_pktinfo) {
2439 bcopy(pktopt->ip6po_pktinfo, &null_pktinfo,
2440 sizeof(null_pktinfo));
2441 in6_clearscope(&null_pktinfo.ipi6_addr);
2442 } else {
2443 /* XXX: we don't have to do this every time... */
2444 bzero(&null_pktinfo, sizeof(null_pktinfo));
2445 }
2446 optdatalen = sizeof(struct in6_pktinfo);
2447 break;
2448 case IPV6_TCLASS:
2449 if (pktopt && pktopt->ip6po_tclass >= 0)
2450 deftclass = pktopt->ip6po_tclass;
2451 optdata = (void *)&deftclass;
2452 optdatalen = sizeof(int);
2453 break;
2454 case IPV6_HOPOPTS:
2455 GET_PKTOPT_EXT_HDR(ip6po_hbh);
2456 break;
2457 case IPV6_RTHDR:
2458 GET_PKTOPT_EXT_HDR(ip6po_rthdr);
2459 break;
2460 case IPV6_RTHDRDSTOPTS:
2461 GET_PKTOPT_EXT_HDR(ip6po_dest1);
2462 break;
2463 case IPV6_DSTOPTS:
2464 GET_PKTOPT_EXT_HDR(ip6po_dest2);
2465 break;
2466 case IPV6_NEXTHOP:
2467 GET_PKTOPT_SOCKADDR(ip6po_nexthop);
2468 break;
2469 case IPV6_USE_MIN_MTU:
2470 if (pktopt)
2471 defminmtu = pktopt->ip6po_minmtu;
2472 optdata = (void *)&defminmtu;
2473 optdatalen = sizeof(int);
2474 break;
2475 case IPV6_DONTFRAG:
2476 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2477 on = 1;
2478 else
2479 on = 0;
2480 optdata = (void *)&on;
2481 optdatalen = sizeof(on);
2482 break;
2483 case IPV6_PREFER_TEMPADDR:
2484 if (pktopt)
2485 defpreftemp = pktopt->ip6po_prefer_tempaddr;
2486 optdata = (void *)&defpreftemp;
2487 optdatalen = sizeof(int);
2488 break;
2489 default: /* should not happen */
2490 #ifdef DIAGNOSTIC
2491 panic("ip6_getpcbopt: unexpected option\n");
2492 #endif
2493 INP_RUNLOCK(inp);
2494 return (ENOPROTOOPT);
2495 }
2496 INP_RUNLOCK(inp);
2497
2498 error = sooptcopyout(sopt, optdata, optdatalen);
2499 if (malloc_optdata)
2500 free(optdata, M_TEMP);
2501
2502 return (error);
2503 }
2504
2505 void
ip6_clearpktopts(struct ip6_pktopts * pktopt,int optname)2506 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2507 {
2508 if (pktopt == NULL)
2509 return;
2510
2511 if (optname == -1 || optname == IPV6_PKTINFO) {
2512 if (pktopt->ip6po_pktinfo)
2513 free(pktopt->ip6po_pktinfo, M_IP6OPT);
2514 pktopt->ip6po_pktinfo = NULL;
2515 }
2516 if (optname == -1 || optname == IPV6_HOPLIMIT) {
2517 pktopt->ip6po_hlim = -1;
2518 pktopt->ip6po_valid &= ~IP6PO_VALID_HLIM;
2519 }
2520 if (optname == -1 || optname == IPV6_TCLASS) {
2521 pktopt->ip6po_tclass = -1;
2522 pktopt->ip6po_valid &= ~IP6PO_VALID_TC;
2523 }
2524 if (optname == -1 || optname == IPV6_NEXTHOP) {
2525 if (pktopt->ip6po_nextroute.ro_nh) {
2526 NH_FREE(pktopt->ip6po_nextroute.ro_nh);
2527 pktopt->ip6po_nextroute.ro_nh = NULL;
2528 }
2529 if (pktopt->ip6po_nexthop)
2530 free(pktopt->ip6po_nexthop, M_IP6OPT);
2531 pktopt->ip6po_nexthop = NULL;
2532 pktopt->ip6po_valid &= ~IP6PO_VALID_NHINFO;
2533 }
2534 if (optname == -1 || optname == IPV6_HOPOPTS) {
2535 if (pktopt->ip6po_hbh)
2536 free(pktopt->ip6po_hbh, M_IP6OPT);
2537 pktopt->ip6po_hbh = NULL;
2538 pktopt->ip6po_valid &= ~IP6PO_VALID_HBH;
2539 }
2540 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2541 if (pktopt->ip6po_dest1)
2542 free(pktopt->ip6po_dest1, M_IP6OPT);
2543 pktopt->ip6po_dest1 = NULL;
2544 pktopt->ip6po_valid &= ~IP6PO_VALID_DEST1;
2545 }
2546 if (optname == -1 || optname == IPV6_RTHDR) {
2547 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2548 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2549 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2550 if (pktopt->ip6po_route.ro_nh) {
2551 NH_FREE(pktopt->ip6po_route.ro_nh);
2552 pktopt->ip6po_route.ro_nh = NULL;
2553 }
2554 pktopt->ip6po_valid &= ~IP6PO_VALID_RHINFO;
2555 }
2556 if (optname == -1 || optname == IPV6_DSTOPTS) {
2557 if (pktopt->ip6po_dest2)
2558 free(pktopt->ip6po_dest2, M_IP6OPT);
2559 pktopt->ip6po_dest2 = NULL;
2560 pktopt->ip6po_valid &= ~IP6PO_VALID_DEST2;
2561 }
2562 }
2563
2564 #define PKTOPT_EXTHDRCPY(type) \
2565 do {\
2566 if (src->type) {\
2567 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2568 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2569 if (dst->type == NULL)\
2570 goto bad;\
2571 bcopy(src->type, dst->type, hlen);\
2572 }\
2573 } while (/*CONSTCOND*/ 0)
2574
2575 static int
copypktopts(struct ip6_pktopts * dst,struct ip6_pktopts * src,int canwait)2576 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2577 {
2578 if (dst == NULL || src == NULL) {
2579 printf("ip6_clearpktopts: invalid argument\n");
2580 return (EINVAL);
2581 }
2582
2583 dst->ip6po_hlim = src->ip6po_hlim;
2584 dst->ip6po_tclass = src->ip6po_tclass;
2585 dst->ip6po_flags = src->ip6po_flags;
2586 dst->ip6po_minmtu = src->ip6po_minmtu;
2587 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2588 if (src->ip6po_pktinfo) {
2589 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2590 M_IP6OPT, canwait);
2591 if (dst->ip6po_pktinfo == NULL)
2592 goto bad;
2593 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2594 }
2595 if (src->ip6po_nexthop) {
2596 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2597 M_IP6OPT, canwait);
2598 if (dst->ip6po_nexthop == NULL)
2599 goto bad;
2600 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2601 src->ip6po_nexthop->sa_len);
2602 }
2603 PKTOPT_EXTHDRCPY(ip6po_hbh);
2604 PKTOPT_EXTHDRCPY(ip6po_dest1);
2605 PKTOPT_EXTHDRCPY(ip6po_dest2);
2606 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2607 dst->ip6po_valid = src->ip6po_valid;
2608 return (0);
2609
2610 bad:
2611 ip6_clearpktopts(dst, -1);
2612 return (ENOBUFS);
2613 }
2614 #undef PKTOPT_EXTHDRCPY
2615
2616 struct ip6_pktopts *
ip6_copypktopts(struct ip6_pktopts * src,int canwait)2617 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2618 {
2619 int error;
2620 struct ip6_pktopts *dst;
2621
2622 dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2623 if (dst == NULL)
2624 return (NULL);
2625 ip6_initpktopts(dst);
2626
2627 if ((error = copypktopts(dst, src, canwait)) != 0) {
2628 free(dst, M_IP6OPT);
2629 return (NULL);
2630 }
2631
2632 return (dst);
2633 }
2634
2635 void
ip6_freepcbopts(struct ip6_pktopts * pktopt)2636 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2637 {
2638 if (pktopt == NULL)
2639 return;
2640
2641 ip6_clearpktopts(pktopt, -1);
2642
2643 free(pktopt, M_IP6OPT);
2644 }
2645
2646 /*
2647 * Set IPv6 outgoing packet options based on advanced API.
2648 */
2649 int
ip6_setpktopts(struct mbuf * control,struct ip6_pktopts * opt,struct ip6_pktopts * stickyopt,struct ucred * cred,int uproto)2650 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2651 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2652 {
2653 struct cmsghdr *cm = NULL;
2654
2655 if (control == NULL || opt == NULL)
2656 return (EINVAL);
2657
2658 /*
2659 * ip6_setpktopt can call ifnet_byindex(), so it's imperative that we
2660 * are in the network epoch here.
2661 */
2662 NET_EPOCH_ASSERT();
2663
2664 ip6_initpktopts(opt);
2665 if (stickyopt) {
2666 int error;
2667
2668 /*
2669 * If stickyopt is provided, make a local copy of the options
2670 * for this particular packet, then override them by ancillary
2671 * objects.
2672 * XXX: copypktopts() does not copy the cached route to a next
2673 * hop (if any). This is not very good in terms of efficiency,
2674 * but we can allow this since this option should be rarely
2675 * used.
2676 */
2677 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2678 return (error);
2679 }
2680
2681 /*
2682 * XXX: Currently, we assume all the optional information is stored
2683 * in a single mbuf.
2684 */
2685 if (control->m_next)
2686 return (EINVAL);
2687
2688 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2689 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2690 int error;
2691
2692 if (control->m_len < CMSG_LEN(0))
2693 return (EINVAL);
2694
2695 cm = mtod(control, struct cmsghdr *);
2696 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2697 return (EINVAL);
2698 if (cm->cmsg_level != IPPROTO_IPV6)
2699 continue;
2700
2701 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2702 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2703 if (error)
2704 return (error);
2705 }
2706
2707 return (0);
2708 }
2709
2710 /*
2711 * Set a particular packet option, as a sticky option or an ancillary data
2712 * item. "len" can be 0 only when it's a sticky option.
2713 * We have 4 cases of combination of "sticky" and "cmsg":
2714 * "sticky=0, cmsg=0": impossible
2715 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2716 * "sticky=1, cmsg=0": RFC3542 socket option
2717 * "sticky=1, cmsg=1": RFC2292 socket option
2718 */
2719 static int
ip6_setpktopt(int optname,u_char * buf,int len,struct ip6_pktopts * opt,struct ucred * cred,int sticky,int cmsg,int uproto)2720 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2721 struct ucred *cred, int sticky, int cmsg, int uproto)
2722 {
2723 int minmtupolicy, preftemp;
2724 int error;
2725
2726 NET_EPOCH_ASSERT();
2727
2728 if (!sticky && !cmsg) {
2729 #ifdef DIAGNOSTIC
2730 printf("ip6_setpktopt: impossible case\n");
2731 #endif
2732 return (EINVAL);
2733 }
2734
2735 /*
2736 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2737 * not be specified in the context of RFC3542. Conversely,
2738 * RFC3542 types should not be specified in the context of RFC2292.
2739 */
2740 if (!cmsg) {
2741 switch (optname) {
2742 case IPV6_2292PKTINFO:
2743 case IPV6_2292HOPLIMIT:
2744 case IPV6_2292NEXTHOP:
2745 case IPV6_2292HOPOPTS:
2746 case IPV6_2292DSTOPTS:
2747 case IPV6_2292RTHDR:
2748 case IPV6_2292PKTOPTIONS:
2749 return (ENOPROTOOPT);
2750 }
2751 }
2752 if (sticky && cmsg) {
2753 switch (optname) {
2754 case IPV6_PKTINFO:
2755 case IPV6_HOPLIMIT:
2756 case IPV6_NEXTHOP:
2757 case IPV6_HOPOPTS:
2758 case IPV6_DSTOPTS:
2759 case IPV6_RTHDRDSTOPTS:
2760 case IPV6_RTHDR:
2761 case IPV6_USE_MIN_MTU:
2762 case IPV6_DONTFRAG:
2763 case IPV6_TCLASS:
2764 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2765 return (ENOPROTOOPT);
2766 }
2767 }
2768
2769 switch (optname) {
2770 case IPV6_2292PKTINFO:
2771 case IPV6_PKTINFO:
2772 {
2773 struct ifnet *ifp = NULL;
2774 struct in6_pktinfo *pktinfo;
2775
2776 if (len != sizeof(struct in6_pktinfo))
2777 return (EINVAL);
2778
2779 pktinfo = (struct in6_pktinfo *)buf;
2780
2781 /*
2782 * An application can clear any sticky IPV6_PKTINFO option by
2783 * doing a "regular" setsockopt with ipi6_addr being
2784 * in6addr_any and ipi6_ifindex being zero.
2785 * [RFC 3542, Section 6]
2786 */
2787 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2788 pktinfo->ipi6_ifindex == 0 &&
2789 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2790 ip6_clearpktopts(opt, optname);
2791 break;
2792 }
2793
2794 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2795 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2796 return (EINVAL);
2797 }
2798 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr))
2799 return (EINVAL);
2800 /* validate the interface index if specified. */
2801 if (pktinfo->ipi6_ifindex) {
2802 ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2803 if (ifp == NULL)
2804 return (ENXIO);
2805 }
2806 if (ifp != NULL && (ifp->if_inet6 == NULL ||
2807 (ifp->if_inet6->nd_flags & ND6_IFF_IFDISABLED) != 0))
2808 return (ENETDOWN);
2809
2810 if (ifp != NULL &&
2811 !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2812 struct in6_ifaddr *ia;
2813
2814 in6_setscope(&pktinfo->ipi6_addr, ifp, NULL);
2815 ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr);
2816 if (ia == NULL)
2817 return (EADDRNOTAVAIL);
2818 ifa_free(&ia->ia_ifa);
2819 }
2820 /*
2821 * We store the address anyway, and let in6_selectsrc()
2822 * validate the specified address. This is because ipi6_addr
2823 * may not have enough information about its scope zone, and
2824 * we may need additional information (such as outgoing
2825 * interface or the scope zone of a destination address) to
2826 * disambiguate the scope.
2827 * XXX: the delay of the validation may confuse the
2828 * application when it is used as a sticky option.
2829 */
2830 if (opt->ip6po_pktinfo == NULL) {
2831 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2832 M_IP6OPT, M_NOWAIT);
2833 if (opt->ip6po_pktinfo == NULL)
2834 return (ENOBUFS);
2835 }
2836 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2837 opt->ip6po_valid |= IP6PO_VALID_PKTINFO;
2838 break;
2839 }
2840
2841 case IPV6_2292HOPLIMIT:
2842 case IPV6_HOPLIMIT:
2843 {
2844 int *hlimp;
2845
2846 /*
2847 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2848 * to simplify the ordering among hoplimit options.
2849 */
2850 if (optname == IPV6_HOPLIMIT && sticky)
2851 return (ENOPROTOOPT);
2852
2853 if (len != sizeof(int))
2854 return (EINVAL);
2855 hlimp = (int *)buf;
2856 if (*hlimp < -1 || *hlimp > 255)
2857 return (EINVAL);
2858
2859 opt->ip6po_hlim = *hlimp;
2860 opt->ip6po_valid |= IP6PO_VALID_HLIM;
2861 break;
2862 }
2863
2864 case IPV6_TCLASS:
2865 {
2866 int tclass;
2867
2868 if (len != sizeof(int))
2869 return (EINVAL);
2870 tclass = *(int *)buf;
2871 if (tclass < -1 || tclass > 255)
2872 return (EINVAL);
2873
2874 opt->ip6po_tclass = tclass;
2875 opt->ip6po_valid |= IP6PO_VALID_TC;
2876 break;
2877 }
2878
2879 case IPV6_2292NEXTHOP:
2880 case IPV6_NEXTHOP:
2881 if (cred != NULL) {
2882 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
2883 if (error)
2884 return (error);
2885 }
2886
2887 if (len == 0) { /* just remove the option */
2888 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2889 break;
2890 }
2891
2892 /* check if cmsg_len is large enough for sa_len */
2893 if (len < sizeof(struct sockaddr) || len < *buf)
2894 return (EINVAL);
2895
2896 switch (((struct sockaddr *)buf)->sa_family) {
2897 case AF_INET6:
2898 {
2899 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
2900 int error;
2901
2902 if (sa6->sin6_len != sizeof(struct sockaddr_in6))
2903 return (EINVAL);
2904
2905 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
2906 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
2907 return (EINVAL);
2908 }
2909 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
2910 != 0) {
2911 return (error);
2912 }
2913 break;
2914 }
2915 case AF_LINK: /* should eventually be supported */
2916 default:
2917 return (EAFNOSUPPORT);
2918 }
2919
2920 /* turn off the previous option, then set the new option. */
2921 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2922 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
2923 if (opt->ip6po_nexthop == NULL)
2924 return (ENOBUFS);
2925 bcopy(buf, opt->ip6po_nexthop, *buf);
2926 opt->ip6po_valid |= IP6PO_VALID_NHINFO;
2927 break;
2928
2929 case IPV6_2292HOPOPTS:
2930 case IPV6_HOPOPTS:
2931 {
2932 struct ip6_hbh *hbh;
2933 int hbhlen;
2934
2935 /*
2936 * XXX: We don't allow a non-privileged user to set ANY HbH
2937 * options, since per-option restriction has too much
2938 * overhead.
2939 */
2940 if (cred != NULL) {
2941 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
2942 if (error)
2943 return (error);
2944 }
2945
2946 if (len == 0) {
2947 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2948 break; /* just remove the option */
2949 }
2950
2951 /* message length validation */
2952 if (len < sizeof(struct ip6_hbh))
2953 return (EINVAL);
2954 hbh = (struct ip6_hbh *)buf;
2955 hbhlen = (hbh->ip6h_len + 1) << 3;
2956 if (len != hbhlen)
2957 return (EINVAL);
2958
2959 /* turn off the previous option, then set the new option. */
2960 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2961 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
2962 if (opt->ip6po_hbh == NULL)
2963 return (ENOBUFS);
2964 bcopy(hbh, opt->ip6po_hbh, hbhlen);
2965 opt->ip6po_valid |= IP6PO_VALID_HBH;
2966
2967 break;
2968 }
2969
2970 case IPV6_2292DSTOPTS:
2971 case IPV6_DSTOPTS:
2972 case IPV6_RTHDRDSTOPTS:
2973 {
2974 struct ip6_dest *dest, **newdest = NULL;
2975 int destlen;
2976
2977 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
2978 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS);
2979 if (error)
2980 return (error);
2981 }
2982
2983 if (len == 0) {
2984 ip6_clearpktopts(opt, optname);
2985 break; /* just remove the option */
2986 }
2987
2988 /* message length validation */
2989 if (len < sizeof(struct ip6_dest))
2990 return (EINVAL);
2991 dest = (struct ip6_dest *)buf;
2992 destlen = (dest->ip6d_len + 1) << 3;
2993 if (len != destlen)
2994 return (EINVAL);
2995
2996 /*
2997 * Determine the position that the destination options header
2998 * should be inserted; before or after the routing header.
2999 */
3000 switch (optname) {
3001 case IPV6_2292DSTOPTS:
3002 /*
3003 * The old advacned API is ambiguous on this point.
3004 * Our approach is to determine the position based
3005 * according to the existence of a routing header.
3006 * Note, however, that this depends on the order of the
3007 * extension headers in the ancillary data; the 1st
3008 * part of the destination options header must appear
3009 * before the routing header in the ancillary data,
3010 * too.
3011 * RFC3542 solved the ambiguity by introducing
3012 * separate ancillary data or option types.
3013 */
3014 if (opt->ip6po_rthdr == NULL)
3015 newdest = &opt->ip6po_dest1;
3016 else
3017 newdest = &opt->ip6po_dest2;
3018 break;
3019 case IPV6_RTHDRDSTOPTS:
3020 newdest = &opt->ip6po_dest1;
3021 break;
3022 case IPV6_DSTOPTS:
3023 newdest = &opt->ip6po_dest2;
3024 break;
3025 }
3026
3027 /* turn off the previous option, then set the new option. */
3028 ip6_clearpktopts(opt, optname);
3029 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
3030 if (*newdest == NULL)
3031 return (ENOBUFS);
3032 bcopy(dest, *newdest, destlen);
3033 if (newdest == &opt->ip6po_dest1)
3034 opt->ip6po_valid |= IP6PO_VALID_DEST1;
3035 else
3036 opt->ip6po_valid |= IP6PO_VALID_DEST2;
3037
3038 break;
3039 }
3040
3041 case IPV6_2292RTHDR:
3042 case IPV6_RTHDR:
3043 {
3044 struct ip6_rthdr *rth;
3045 int rthlen;
3046
3047 if (len == 0) {
3048 ip6_clearpktopts(opt, IPV6_RTHDR);
3049 break; /* just remove the option */
3050 }
3051
3052 /* message length validation */
3053 if (len < sizeof(struct ip6_rthdr))
3054 return (EINVAL);
3055 rth = (struct ip6_rthdr *)buf;
3056 rthlen = (rth->ip6r_len + 1) << 3;
3057 if (len != rthlen)
3058 return (EINVAL);
3059
3060 switch (rth->ip6r_type) {
3061 case IPV6_RTHDR_TYPE_0:
3062 if (rth->ip6r_len == 0) /* must contain one addr */
3063 return (EINVAL);
3064 if (rth->ip6r_len % 2) /* length must be even */
3065 return (EINVAL);
3066 if (rth->ip6r_len / 2 != rth->ip6r_segleft)
3067 return (EINVAL);
3068 break;
3069 default:
3070 return (EINVAL); /* not supported */
3071 }
3072
3073 /* turn off the previous option */
3074 ip6_clearpktopts(opt, IPV6_RTHDR);
3075 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
3076 if (opt->ip6po_rthdr == NULL)
3077 return (ENOBUFS);
3078 bcopy(rth, opt->ip6po_rthdr, rthlen);
3079 opt->ip6po_valid |= IP6PO_VALID_RHINFO;
3080
3081 break;
3082 }
3083
3084 case IPV6_USE_MIN_MTU:
3085 if (len != sizeof(int))
3086 return (EINVAL);
3087 minmtupolicy = *(int *)buf;
3088 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
3089 minmtupolicy != IP6PO_MINMTU_DISABLE &&
3090 minmtupolicy != IP6PO_MINMTU_ALL) {
3091 return (EINVAL);
3092 }
3093 opt->ip6po_minmtu = minmtupolicy;
3094 break;
3095
3096 case IPV6_DONTFRAG:
3097 if (len != sizeof(int))
3098 return (EINVAL);
3099
3100 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
3101 /*
3102 * we ignore this option for TCP sockets.
3103 * (RFC3542 leaves this case unspecified.)
3104 */
3105 opt->ip6po_flags &= ~IP6PO_DONTFRAG;
3106 } else
3107 opt->ip6po_flags |= IP6PO_DONTFRAG;
3108 break;
3109
3110 case IPV6_PREFER_TEMPADDR:
3111 if (len != sizeof(int))
3112 return (EINVAL);
3113 preftemp = *(int *)buf;
3114 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
3115 preftemp != IP6PO_TEMPADDR_NOTPREFER &&
3116 preftemp != IP6PO_TEMPADDR_PREFER) {
3117 return (EINVAL);
3118 }
3119 opt->ip6po_prefer_tempaddr = preftemp;
3120 break;
3121
3122 default:
3123 return (ENOPROTOOPT);
3124 } /* end of switch */
3125
3126 return (0);
3127 }
3128
3129 /*
3130 * Routine called from ip6_output() to loop back a copy of an IP6 multicast
3131 * packet to the input queue of a specified interface. Note that this
3132 * calls the output routine of the loopback "driver", but with an interface
3133 * pointer that might NOT be &loif -- easier than replicating that code here.
3134 */
3135 void
ip6_mloopback(struct ifnet * ifp,struct mbuf * m)3136 ip6_mloopback(struct ifnet *ifp, struct mbuf *m)
3137 {
3138 struct mbuf *copym;
3139 struct ip6_hdr *ip6;
3140
3141 copym = m_copym(m, 0, M_COPYALL, M_NOWAIT);
3142 if (copym == NULL)
3143 return;
3144
3145 /*
3146 * Make sure to deep-copy IPv6 header portion in case the data
3147 * is in an mbuf cluster, so that we can safely override the IPv6
3148 * header portion later.
3149 */
3150 if (!M_WRITABLE(copym) ||
3151 copym->m_len < sizeof(struct ip6_hdr)) {
3152 copym = m_pullup(copym, sizeof(struct ip6_hdr));
3153 if (copym == NULL)
3154 return;
3155 }
3156 ip6 = mtod(copym, struct ip6_hdr *);
3157 /*
3158 * clear embedded scope identifiers if necessary.
3159 * in6_clearscope will touch the addresses only when necessary.
3160 */
3161 in6_clearscope(&ip6->ip6_src);
3162 in6_clearscope(&ip6->ip6_dst);
3163 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
3164 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 |
3165 CSUM_PSEUDO_HDR;
3166 copym->m_pkthdr.csum_data = 0xffff;
3167 }
3168 if_simloop(ifp, copym, AF_INET6, 0);
3169 }
3170
3171 /*
3172 * Chop IPv6 header off from the payload.
3173 */
3174 static int
ip6_splithdr(struct mbuf * m,struct ip6_exthdrs * exthdrs)3175 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
3176 {
3177 struct mbuf *mh;
3178 struct ip6_hdr *ip6;
3179
3180 ip6 = mtod(m, struct ip6_hdr *);
3181 if (m->m_len > sizeof(*ip6)) {
3182 mh = m_gethdr(M_NOWAIT, MT_DATA);
3183 if (mh == NULL) {
3184 m_freem(m);
3185 return ENOBUFS;
3186 }
3187 m_move_pkthdr(mh, m);
3188 M_ALIGN(mh, sizeof(*ip6));
3189 m->m_len -= sizeof(*ip6);
3190 m->m_data += sizeof(*ip6);
3191 mh->m_next = m;
3192 m = mh;
3193 m->m_len = sizeof(*ip6);
3194 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
3195 }
3196 exthdrs->ip6e_ip6 = m;
3197 return 0;
3198 }
3199
3200 /*
3201 * Compute IPv6 extension header length.
3202 */
3203 int
ip6_optlen(struct inpcb * inp)3204 ip6_optlen(struct inpcb *inp)
3205 {
3206 int len;
3207
3208 if (!inp->in6p_outputopts)
3209 return 0;
3210
3211 len = 0;
3212 #define elen(x) \
3213 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
3214
3215 len += elen(inp->in6p_outputopts->ip6po_hbh);
3216 if (inp->in6p_outputopts->ip6po_rthdr)
3217 /* dest1 is valid with rthdr only */
3218 len += elen(inp->in6p_outputopts->ip6po_dest1);
3219 len += elen(inp->in6p_outputopts->ip6po_rthdr);
3220 len += elen(inp->in6p_outputopts->ip6po_dest2);
3221 return len;
3222 #undef elen
3223 }
3224