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 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
63 */
64
65 #include <sys/cdefs.h>
66 __FBSDID("$FreeBSD: releng/12.0/sys/netinet6/ip6_output.c 338450 2018-09-03 22:27:27Z bz $");
67
68 #include "opt_inet.h"
69 #include "opt_inet6.h"
70 #include "opt_ratelimit.h"
71 #include "opt_ipsec.h"
72 #include "opt_sctp.h"
73 #include "opt_route.h"
74 #include "opt_rss.h"
75
76 #include <sys/param.h>
77 #include <sys/kernel.h>
78 #include <sys/malloc.h>
79 #include <sys/mbuf.h>
80 #include <sys/errno.h>
81 #include <sys/priv.h>
82 #include <sys/proc.h>
83 #include <sys/protosw.h>
84 #include <sys/socket.h>
85 #include <sys/socketvar.h>
86 #include <sys/syslog.h>
87 #include <sys/ucred.h>
88
89 #include <machine/in_cksum.h>
90
91 #include <net/if.h>
92 #include <net/if_var.h>
93 #include <net/if_llatbl.h>
94 #include <net/netisr.h>
95 #include <net/route.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
113 #include <netipsec/ipsec_support.h>
114 #ifdef SCTP
115 #include <netinet/sctp.h>
116 #include <netinet/sctp_crc32.h>
117 #endif
118
119 #include <netinet6/ip6protosw.h>
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_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
146 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
147 static int ip6_getpmtu(struct route_in6 *, int,
148 struct ifnet *, const struct in6_addr *, u_long *, int *, u_int,
149 u_int);
150 static int ip6_calcmtu(struct ifnet *, const struct in6_addr *, u_long,
151 u_long *, int *, u_int);
152 static int ip6_getpmtu_ctl(u_int, const struct in6_addr *, u_long *);
153 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
154
155
156 /*
157 * Make an extension header from option data. hp is the source, and
158 * mp is the destination.
159 */
160 #define MAKE_EXTHDR(hp, mp) \
161 do { \
162 if (hp) { \
163 struct ip6_ext *eh = (struct ip6_ext *)(hp); \
164 error = ip6_copyexthdr((mp), (caddr_t)(hp), \
165 ((eh)->ip6e_len + 1) << 3); \
166 if (error) \
167 goto freehdrs; \
168 } \
169 } while (/*CONSTCOND*/ 0)
170
171 /*
172 * Form a chain of extension headers.
173 * m is the extension header mbuf
174 * mp is the previous mbuf in the chain
175 * p is the next header
176 * i is the type of option.
177 */
178 #define MAKE_CHAIN(m, mp, p, i)\
179 do {\
180 if (m) {\
181 if (!hdrsplit) \
182 panic("assumption failed: hdr not split"); \
183 *mtod((m), u_char *) = *(p);\
184 *(p) = (i);\
185 p = mtod((m), u_char *);\
186 (m)->m_next = (mp)->m_next;\
187 (mp)->m_next = (m);\
188 (mp) = (m);\
189 }\
190 } while (/*CONSTCOND*/ 0)
191
192 void
193 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
194 {
195 u_short csum;
196
197 csum = in_cksum_skip(m, offset + plen, offset);
198 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
199 csum = 0xffff;
200 offset += m->m_pkthdr.csum_data; /* checksum offset */
201
202 if (offset + sizeof(csum) > m->m_len)
203 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
204 else
205 *(u_short *)mtodo(m, offset) = csum;
206 }
207
208 int
209 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto,
210 int fraglen , uint32_t id)
211 {
212 struct mbuf *m, **mnext, *m_frgpart;
213 struct ip6_hdr *ip6, *mhip6;
214 struct ip6_frag *ip6f;
215 int off;
216 int error;
217 int tlen = m0->m_pkthdr.len;
218
219 KASSERT((fraglen % 8 == 0), ("Fragment length must be a multiple of 8"));
220
221 m = m0;
222 ip6 = mtod(m, struct ip6_hdr *);
223 mnext = &m->m_nextpkt;
224
225 for (off = hlen; off < tlen; off += fraglen) {
226 m = m_gethdr(M_NOWAIT, MT_DATA);
227 if (!m) {
228 IP6STAT_INC(ip6s_odropped);
229 return (ENOBUFS);
230 }
231 m->m_flags = m0->m_flags & M_COPYFLAGS;
232 *mnext = m;
233 mnext = &m->m_nextpkt;
234 m->m_data += max_linkhdr;
235 mhip6 = mtod(m, struct ip6_hdr *);
236 *mhip6 = *ip6;
237 m->m_len = sizeof(*mhip6);
238 error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
239 if (error) {
240 IP6STAT_INC(ip6s_odropped);
241 return (error);
242 }
243 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
244 if (off + fraglen >= tlen)
245 fraglen = tlen - off;
246 else
247 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
248 mhip6->ip6_plen = htons((u_short)(fraglen + hlen +
249 sizeof(*ip6f) - sizeof(struct ip6_hdr)));
250 if ((m_frgpart = m_copym(m0, off, fraglen, M_NOWAIT)) == NULL) {
251 IP6STAT_INC(ip6s_odropped);
252 return (ENOBUFS);
253 }
254 m_cat(m, m_frgpart);
255 m->m_pkthdr.len = fraglen + hlen + sizeof(*ip6f);
256 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum;
257 m->m_pkthdr.rcvif = NULL;
258 ip6f->ip6f_reserved = 0;
259 ip6f->ip6f_ident = id;
260 ip6f->ip6f_nxt = nextproto;
261 IP6STAT_INC(ip6s_ofragments);
262 in6_ifstat_inc(ifp, ifs6_out_fragcreat);
263 }
264
265 return (0);
266 }
267
268 /*
269 * IP6 output. The packet in mbuf chain m contains a skeletal IP6
270 * header (with pri, len, nxt, hlim, src, dst).
271 * This function may modify ver and hlim only.
272 * The mbuf chain containing the packet will be freed.
273 * The mbuf opt, if present, will not be freed.
274 * If route_in6 ro is present and has ro_rt initialized, route lookup would be
275 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
276 * then result of route lookup is stored in ro->ro_rt.
277 *
278 * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and
279 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one,
280 * which is rt_mtu.
281 *
282 * ifpp - XXX: just for statistics
283 */
284 /*
285 * XXX TODO: no flowid is assigned for outbound flows?
286 */
287 int
288 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
289 struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
290 struct ifnet **ifpp, struct inpcb *inp)
291 {
292 struct ip6_hdr *ip6;
293 struct ifnet *ifp, *origifp;
294 struct mbuf *m = m0;
295 struct mbuf *mprev = NULL;
296 int hlen, tlen, len;
297 struct route_in6 ip6route;
298 struct rtentry *rt = NULL;
299 struct sockaddr_in6 *dst, src_sa, dst_sa;
300 struct in6_addr odst;
301 int error = 0;
302 struct in6_ifaddr *ia = NULL;
303 u_long mtu;
304 int alwaysfrag, dontfrag;
305 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
306 struct ip6_exthdrs exthdrs;
307 struct in6_addr src0, dst0;
308 u_int32_t zone;
309 struct route_in6 *ro_pmtu = NULL;
310 int hdrsplit = 0;
311 int sw_csum, tso;
312 int needfiblookup;
313 uint32_t fibnum;
314 struct m_tag *fwd_tag = NULL;
315 uint32_t id;
316
317 if (inp != NULL) {
318 INP_LOCK_ASSERT(inp);
319 M_SETFIB(m, inp->inp_inc.inc_fibnum);
320 if ((flags & IP_NODEFAULTFLOWID) == 0) {
321 /* unconditionally set flowid */
322 m->m_pkthdr.flowid = inp->inp_flowid;
323 M_HASHTYPE_SET(m, inp->inp_flowtype);
324 }
325 }
326
327 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
328 /*
329 * IPSec checking which handles several cases.
330 * FAST IPSEC: We re-injected the packet.
331 * XXX: need scope argument.
332 */
333 if (IPSEC_ENABLED(ipv6)) {
334 if ((error = IPSEC_OUTPUT(ipv6, m, inp)) != 0) {
335 if (error == EINPROGRESS)
336 error = 0;
337 goto done;
338 }
339 }
340 #endif /* IPSEC */
341
342 bzero(&exthdrs, sizeof(exthdrs));
343 if (opt) {
344 /* Hop-by-Hop options header */
345 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
346 /* Destination options header(1st part) */
347 if (opt->ip6po_rthdr) {
348 /*
349 * Destination options header(1st part)
350 * This only makes sense with a routing header.
351 * See Section 9.2 of RFC 3542.
352 * Disabling this part just for MIP6 convenience is
353 * a bad idea. We need to think carefully about a
354 * way to make the advanced API coexist with MIP6
355 * options, which might automatically be inserted in
356 * the kernel.
357 */
358 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
359 }
360 /* Routing header */
361 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
362 /* Destination options header(2nd part) */
363 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
364 }
365
366 /*
367 * Calculate the total length of the extension header chain.
368 * Keep the length of the unfragmentable part for fragmentation.
369 */
370 optlen = 0;
371 if (exthdrs.ip6e_hbh)
372 optlen += exthdrs.ip6e_hbh->m_len;
373 if (exthdrs.ip6e_dest1)
374 optlen += exthdrs.ip6e_dest1->m_len;
375 if (exthdrs.ip6e_rthdr)
376 optlen += exthdrs.ip6e_rthdr->m_len;
377 unfragpartlen = optlen + sizeof(struct ip6_hdr);
378
379 /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */
380 if (exthdrs.ip6e_dest2)
381 optlen += exthdrs.ip6e_dest2->m_len;
382
383 /*
384 * If there is at least one extension header,
385 * separate IP6 header from the payload.
386 */
387 if (optlen && !hdrsplit) {
388 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
389 m = NULL;
390 goto freehdrs;
391 }
392 m = exthdrs.ip6e_ip6;
393 hdrsplit++;
394 }
395
396 ip6 = mtod(m, struct ip6_hdr *);
397
398 /* adjust mbuf packet header length */
399 m->m_pkthdr.len += optlen;
400 plen = m->m_pkthdr.len - sizeof(*ip6);
401
402 /* If this is a jumbo payload, insert a jumbo payload option. */
403 if (plen > IPV6_MAXPACKET) {
404 if (!hdrsplit) {
405 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
406 m = NULL;
407 goto freehdrs;
408 }
409 m = exthdrs.ip6e_ip6;
410 hdrsplit++;
411 }
412 /* adjust pointer */
413 ip6 = mtod(m, struct ip6_hdr *);
414 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
415 goto freehdrs;
416 ip6->ip6_plen = 0;
417 } else
418 ip6->ip6_plen = htons(plen);
419
420 /*
421 * Concatenate headers and fill in next header fields.
422 * Here we have, on "m"
423 * IPv6 payload
424 * and we insert headers accordingly. Finally, we should be getting:
425 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
426 *
427 * during the header composing process, "m" points to IPv6 header.
428 * "mprev" points to an extension header prior to esp.
429 */
430 u_char *nexthdrp = &ip6->ip6_nxt;
431 mprev = m;
432
433 /*
434 * we treat dest2 specially. this makes IPsec processing
435 * much easier. the goal here is to make mprev point the
436 * mbuf prior to dest2.
437 *
438 * result: IPv6 dest2 payload
439 * m and mprev will point to IPv6 header.
440 */
441 if (exthdrs.ip6e_dest2) {
442 if (!hdrsplit)
443 panic("assumption failed: hdr not split");
444 exthdrs.ip6e_dest2->m_next = m->m_next;
445 m->m_next = exthdrs.ip6e_dest2;
446 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
447 ip6->ip6_nxt = IPPROTO_DSTOPTS;
448 }
449
450 /*
451 * result: IPv6 hbh dest1 rthdr dest2 payload
452 * m will point to IPv6 header. mprev will point to the
453 * extension header prior to dest2 (rthdr in the above case).
454 */
455 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
456 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
457 IPPROTO_DSTOPTS);
458 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
459 IPPROTO_ROUTING);
460
461 /*
462 * If there is a routing header, discard the packet.
463 */
464 if (exthdrs.ip6e_rthdr) {
465 error = EINVAL;
466 goto bad;
467 }
468
469 /* Source address validation */
470 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
471 (flags & IPV6_UNSPECSRC) == 0) {
472 error = EOPNOTSUPP;
473 IP6STAT_INC(ip6s_badscope);
474 goto bad;
475 }
476 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
477 error = EOPNOTSUPP;
478 IP6STAT_INC(ip6s_badscope);
479 goto bad;
480 }
481
482 IP6STAT_INC(ip6s_localout);
483
484 /*
485 * Route packet.
486 */
487 if (ro == NULL) {
488 ro = &ip6route;
489 bzero((caddr_t)ro, sizeof(*ro));
490 }
491 ro_pmtu = ro;
492 if (opt && opt->ip6po_rthdr)
493 ro = &opt->ip6po_route;
494 dst = (struct sockaddr_in6 *)&ro->ro_dst;
495 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
496 again:
497 /*
498 * if specified, try to fill in the traffic class field.
499 * do not override if a non-zero value is already set.
500 * we check the diffserv field and the ecn field separately.
501 */
502 if (opt && opt->ip6po_tclass >= 0) {
503 int mask = 0;
504
505 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
506 mask |= 0xfc;
507 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
508 mask |= 0x03;
509 if (mask != 0)
510 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
511 }
512
513 /* fill in or override the hop limit field, if necessary. */
514 if (opt && opt->ip6po_hlim != -1)
515 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
516 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
517 if (im6o != NULL)
518 ip6->ip6_hlim = im6o->im6o_multicast_hlim;
519 else
520 ip6->ip6_hlim = V_ip6_defmcasthlim;
521 }
522 /*
523 * Validate route against routing table additions;
524 * a better/more specific route might have been added.
525 * Make sure address family is set in route.
526 */
527 if (inp) {
528 ro->ro_dst.sin6_family = AF_INET6;
529 RT_VALIDATE((struct route *)ro, &inp->inp_rt_cookie, fibnum);
530 }
531 if (ro->ro_rt && fwd_tag == NULL && (ro->ro_rt->rt_flags & RTF_UP) &&
532 ro->ro_dst.sin6_family == AF_INET6 &&
533 IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)) {
534 rt = ro->ro_rt;
535 ifp = ro->ro_rt->rt_ifp;
536 } else {
537 if (ro->ro_lle)
538 LLE_FREE(ro->ro_lle); /* zeros ro_lle */
539 ro->ro_lle = NULL;
540 if (fwd_tag == NULL) {
541 bzero(&dst_sa, sizeof(dst_sa));
542 dst_sa.sin6_family = AF_INET6;
543 dst_sa.sin6_len = sizeof(dst_sa);
544 dst_sa.sin6_addr = ip6->ip6_dst;
545 }
546 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp,
547 &rt, fibnum);
548 if (error != 0) {
549 if (ifp != NULL)
550 in6_ifstat_inc(ifp, ifs6_out_discard);
551 goto bad;
552 }
553 }
554 if (rt == NULL) {
555 /*
556 * If in6_selectroute() does not return a route entry,
557 * dst may not have been updated.
558 */
559 *dst = dst_sa; /* XXX */
560 }
561
562 /*
563 * then rt (for unicast) and ifp must be non-NULL valid values.
564 */
565 if ((flags & IPV6_FORWARDING) == 0) {
566 /* XXX: the FORWARDING flag can be set for mrouting. */
567 in6_ifstat_inc(ifp, ifs6_out_request);
568 }
569 if (rt != NULL) {
570 ia = (struct in6_ifaddr *)(rt->rt_ifa);
571 counter_u64_add(rt->rt_pksent, 1);
572 }
573
574
575 /*
576 * The outgoing interface must be in the zone of source and
577 * destination addresses.
578 */
579 origifp = ifp;
580
581 src0 = ip6->ip6_src;
582 if (in6_setscope(&src0, origifp, &zone))
583 goto badscope;
584 bzero(&src_sa, sizeof(src_sa));
585 src_sa.sin6_family = AF_INET6;
586 src_sa.sin6_len = sizeof(src_sa);
587 src_sa.sin6_addr = ip6->ip6_src;
588 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
589 goto badscope;
590
591 dst0 = ip6->ip6_dst;
592 if (in6_setscope(&dst0, origifp, &zone))
593 goto badscope;
594 /* re-initialize to be sure */
595 bzero(&dst_sa, sizeof(dst_sa));
596 dst_sa.sin6_family = AF_INET6;
597 dst_sa.sin6_len = sizeof(dst_sa);
598 dst_sa.sin6_addr = ip6->ip6_dst;
599 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) {
600 goto badscope;
601 }
602
603 /* We should use ia_ifp to support the case of
604 * sending packets to an address of our own.
605 */
606 if (ia != NULL && ia->ia_ifp)
607 ifp = ia->ia_ifp;
608
609 /* scope check is done. */
610 goto routefound;
611
612 badscope:
613 IP6STAT_INC(ip6s_badscope);
614 in6_ifstat_inc(origifp, ifs6_out_discard);
615 if (error == 0)
616 error = EHOSTUNREACH; /* XXX */
617 goto bad;
618
619 routefound:
620 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
621 if (opt && opt->ip6po_nextroute.ro_rt) {
622 /*
623 * The nexthop is explicitly specified by the
624 * application. We assume the next hop is an IPv6
625 * address.
626 */
627 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
628 }
629 else if ((rt->rt_flags & RTF_GATEWAY))
630 dst = (struct sockaddr_in6 *)rt->rt_gateway;
631 }
632
633 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
634 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
635 } else {
636 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
637 in6_ifstat_inc(ifp, ifs6_out_mcast);
638 /*
639 * Confirm that the outgoing interface supports multicast.
640 */
641 if (!(ifp->if_flags & IFF_MULTICAST)) {
642 IP6STAT_INC(ip6s_noroute);
643 in6_ifstat_inc(ifp, ifs6_out_discard);
644 error = ENETUNREACH;
645 goto bad;
646 }
647 if ((im6o == NULL && in6_mcast_loop) ||
648 (im6o && im6o->im6o_multicast_loop)) {
649 /*
650 * Loop back multicast datagram if not expressly
651 * forbidden to do so, even if we have not joined
652 * the address; protocols will filter it later,
653 * thus deferring a hash lookup and lock acquisition
654 * at the expense of an m_copym().
655 */
656 ip6_mloopback(ifp, m);
657 } else {
658 /*
659 * If we are acting as a multicast router, perform
660 * multicast forwarding as if the packet had just
661 * arrived on the interface to which we are about
662 * to send. The multicast forwarding function
663 * recursively calls this function, using the
664 * IPV6_FORWARDING flag to prevent infinite recursion.
665 *
666 * Multicasts that are looped back by ip6_mloopback(),
667 * above, will be forwarded by the ip6_input() routine,
668 * if necessary.
669 */
670 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
671 /*
672 * XXX: ip6_mforward expects that rcvif is NULL
673 * when it is called from the originating path.
674 * However, it may not always be the case.
675 */
676 m->m_pkthdr.rcvif = NULL;
677 if (ip6_mforward(ip6, ifp, m) != 0) {
678 m_freem(m);
679 goto done;
680 }
681 }
682 }
683 /*
684 * Multicasts with a hoplimit of zero may be looped back,
685 * above, but must not be transmitted on a network.
686 * Also, multicasts addressed to the loopback interface
687 * are not sent -- the above call to ip6_mloopback() will
688 * loop back a copy if this host actually belongs to the
689 * destination group on the loopback interface.
690 */
691 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
692 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
693 m_freem(m);
694 goto done;
695 }
696 }
697
698 /*
699 * Fill the outgoing inteface to tell the upper layer
700 * to increment per-interface statistics.
701 */
702 if (ifpp)
703 *ifpp = ifp;
704
705 /* Determine path MTU. */
706 if ((error = ip6_getpmtu(ro_pmtu, ro != ro_pmtu, ifp, &ip6->ip6_dst,
707 &mtu, &alwaysfrag, fibnum, *nexthdrp)) != 0)
708 goto bad;
709
710 /*
711 * The caller of this function may specify to use the minimum MTU
712 * in some cases.
713 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
714 * setting. The logic is a bit complicated; by default, unicast
715 * packets will follow path MTU while multicast packets will be sent at
716 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets
717 * including unicast ones will be sent at the minimum MTU. Multicast
718 * packets will always be sent at the minimum MTU unless
719 * IP6PO_MINMTU_DISABLE is explicitly specified.
720 * See RFC 3542 for more details.
721 */
722 if (mtu > IPV6_MMTU) {
723 if ((flags & IPV6_MINMTU))
724 mtu = IPV6_MMTU;
725 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
726 mtu = IPV6_MMTU;
727 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
728 (opt == NULL ||
729 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
730 mtu = IPV6_MMTU;
731 }
732 }
733
734 /*
735 * clear embedded scope identifiers if necessary.
736 * in6_clearscope will touch the addresses only when necessary.
737 */
738 in6_clearscope(&ip6->ip6_src);
739 in6_clearscope(&ip6->ip6_dst);
740
741 /*
742 * If the outgoing packet contains a hop-by-hop options header,
743 * it must be examined and processed even by the source node.
744 * (RFC 2460, section 4.)
745 */
746 if (exthdrs.ip6e_hbh) {
747 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
748 u_int32_t dummy; /* XXX unused */
749 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
750
751 #ifdef DIAGNOSTIC
752 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
753 panic("ip6e_hbh is not contiguous");
754 #endif
755 /*
756 * XXX: if we have to send an ICMPv6 error to the sender,
757 * we need the M_LOOP flag since icmp6_error() expects
758 * the IPv6 and the hop-by-hop options header are
759 * contiguous unless the flag is set.
760 */
761 m->m_flags |= M_LOOP;
762 m->m_pkthdr.rcvif = ifp;
763 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
764 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
765 &dummy, &plen) < 0) {
766 /* m was already freed at this point */
767 error = EINVAL;/* better error? */
768 goto done;
769 }
770 m->m_flags &= ~M_LOOP; /* XXX */
771 m->m_pkthdr.rcvif = NULL;
772 }
773
774 /* Jump over all PFIL processing if hooks are not active. */
775 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
776 goto passout;
777
778 odst = ip6->ip6_dst;
779 /* Run through list of hooks for output packets. */
780 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, 0, inp);
781 if (error != 0 || m == NULL)
782 goto done;
783 /* adjust pointer */
784 ip6 = mtod(m, struct ip6_hdr *);
785
786 needfiblookup = 0;
787 /* See if destination IP address was changed by packet filter. */
788 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
789 m->m_flags |= M_SKIP_FIREWALL;
790 /* If destination is now ourself drop to ip6_input(). */
791 if (in6_localip(&ip6->ip6_dst)) {
792 m->m_flags |= M_FASTFWD_OURS;
793 if (m->m_pkthdr.rcvif == NULL)
794 m->m_pkthdr.rcvif = V_loif;
795 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
796 m->m_pkthdr.csum_flags |=
797 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
798 m->m_pkthdr.csum_data = 0xffff;
799 }
800 #ifdef SCTP
801 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
802 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
803 #endif
804 error = netisr_queue(NETISR_IPV6, m);
805 goto done;
806 } else {
807 RO_INVALIDATE_CACHE(ro);
808 needfiblookup = 1; /* Redo the routing table lookup. */
809 }
810 }
811 /* See if fib was changed by packet filter. */
812 if (fibnum != M_GETFIB(m)) {
813 m->m_flags |= M_SKIP_FIREWALL;
814 fibnum = M_GETFIB(m);
815 RO_INVALIDATE_CACHE(ro);
816 needfiblookup = 1;
817 }
818 if (needfiblookup)
819 goto again;
820
821 /* See if local, if yes, send it to netisr. */
822 if (m->m_flags & M_FASTFWD_OURS) {
823 if (m->m_pkthdr.rcvif == NULL)
824 m->m_pkthdr.rcvif = V_loif;
825 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
826 m->m_pkthdr.csum_flags |=
827 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
828 m->m_pkthdr.csum_data = 0xffff;
829 }
830 #ifdef SCTP
831 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
832 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
833 #endif
834 error = netisr_queue(NETISR_IPV6, m);
835 goto done;
836 }
837 /* Or forward to some other address? */
838 if ((m->m_flags & M_IP6_NEXTHOP) &&
839 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
840 dst = (struct sockaddr_in6 *)&ro->ro_dst;
841 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
842 m->m_flags |= M_SKIP_FIREWALL;
843 m->m_flags &= ~M_IP6_NEXTHOP;
844 m_tag_delete(m, fwd_tag);
845 goto again;
846 }
847
848 passout:
849 /*
850 * Send the packet to the outgoing interface.
851 * If necessary, do IPv6 fragmentation before sending.
852 *
853 * the logic here is rather complex:
854 * 1: normal case (dontfrag == 0, alwaysfrag == 0)
855 * 1-a: send as is if tlen <= path mtu
856 * 1-b: fragment if tlen > path mtu
857 *
858 * 2: if user asks us not to fragment (dontfrag == 1)
859 * 2-a: send as is if tlen <= interface mtu
860 * 2-b: error if tlen > interface mtu
861 *
862 * 3: if we always need to attach fragment header (alwaysfrag == 1)
863 * always fragment
864 *
865 * 4: if dontfrag == 1 && alwaysfrag == 1
866 * error, as we cannot handle this conflicting request
867 */
868 sw_csum = m->m_pkthdr.csum_flags;
869 if (!hdrsplit) {
870 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0;
871 sw_csum &= ~ifp->if_hwassist;
872 } else
873 tso = 0;
874 /*
875 * If we added extension headers, we will not do TSO and calculate the
876 * checksums ourselves for now.
877 * XXX-BZ Need a framework to know when the NIC can handle it, even
878 * with ext. hdrs.
879 */
880 if (sw_csum & CSUM_DELAY_DATA_IPV6) {
881 sw_csum &= ~CSUM_DELAY_DATA_IPV6;
882 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
883 }
884 #ifdef SCTP
885 if (sw_csum & CSUM_SCTP_IPV6) {
886 sw_csum &= ~CSUM_SCTP_IPV6;
887 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
888 }
889 #endif
890 m->m_pkthdr.csum_flags &= ifp->if_hwassist;
891 tlen = m->m_pkthdr.len;
892
893 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
894 dontfrag = 1;
895 else
896 dontfrag = 0;
897 if (dontfrag && alwaysfrag) { /* case 4 */
898 /* conflicting request - can't transmit */
899 error = EMSGSIZE;
900 goto bad;
901 }
902 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */
903 /*
904 * Even if the DONTFRAG option is specified, we cannot send the
905 * packet when the data length is larger than the MTU of the
906 * outgoing interface.
907 * Notify the error by sending IPV6_PATHMTU ancillary data if
908 * application wanted to know the MTU value. Also return an
909 * error code (this is not described in the API spec).
910 */
911 if (inp != NULL)
912 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu);
913 error = EMSGSIZE;
914 goto bad;
915 }
916
917 /*
918 * transmit packet without fragmentation
919 */
920 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
921 struct in6_ifaddr *ia6;
922
923 ip6 = mtod(m, struct ip6_hdr *);
924 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
925 if (ia6) {
926 /* Record statistics for this interface address. */
927 counter_u64_add(ia6->ia_ifa.ifa_opackets, 1);
928 counter_u64_add(ia6->ia_ifa.ifa_obytes,
929 m->m_pkthdr.len);
930 ifa_free(&ia6->ia_ifa);
931 }
932 #ifdef RATELIMIT
933 if (inp != NULL) {
934 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
935 in_pcboutput_txrtlmt(inp, ifp, m);
936 /* stamp send tag on mbuf */
937 m->m_pkthdr.snd_tag = inp->inp_snd_tag;
938 } else {
939 m->m_pkthdr.snd_tag = NULL;
940 }
941 #endif
942 error = nd6_output_ifp(ifp, origifp, m, dst,
943 (struct route *)ro);
944 #ifdef RATELIMIT
945 /* check for route change */
946 if (error == EAGAIN)
947 in_pcboutput_eagain(inp);
948 #endif
949 goto done;
950 }
951
952 /*
953 * try to fragment the packet. case 1-b and 3
954 */
955 if (mtu < IPV6_MMTU) {
956 /* path MTU cannot be less than IPV6_MMTU */
957 error = EMSGSIZE;
958 in6_ifstat_inc(ifp, ifs6_out_fragfail);
959 goto bad;
960 } else if (ip6->ip6_plen == 0) {
961 /* jumbo payload cannot be fragmented */
962 error = EMSGSIZE;
963 in6_ifstat_inc(ifp, ifs6_out_fragfail);
964 goto bad;
965 } else {
966 u_char nextproto;
967
968 /*
969 * Too large for the destination or interface;
970 * fragment if possible.
971 * Must be able to put at least 8 bytes per fragment.
972 */
973 hlen = unfragpartlen;
974 if (mtu > IPV6_MAXPACKET)
975 mtu = IPV6_MAXPACKET;
976
977 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
978 if (len < 8) {
979 error = EMSGSIZE;
980 in6_ifstat_inc(ifp, ifs6_out_fragfail);
981 goto bad;
982 }
983
984 /*
985 * If the interface will not calculate checksums on
986 * fragmented packets, then do it here.
987 * XXX-BZ handle the hw offloading case. Need flags.
988 */
989 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
990 in6_delayed_cksum(m, plen, hlen);
991 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
992 }
993 #ifdef SCTP
994 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
995 sctp_delayed_cksum(m, hlen);
996 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
997 }
998 #endif
999 /*
1000 * Change the next header field of the last header in the
1001 * unfragmentable part.
1002 */
1003 if (exthdrs.ip6e_rthdr) {
1004 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
1005 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
1006 } else if (exthdrs.ip6e_dest1) {
1007 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
1008 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
1009 } else if (exthdrs.ip6e_hbh) {
1010 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
1011 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
1012 } else {
1013 nextproto = ip6->ip6_nxt;
1014 ip6->ip6_nxt = IPPROTO_FRAGMENT;
1015 }
1016
1017 /*
1018 * Loop through length of segment after first fragment,
1019 * make new header and copy data of each part and link onto
1020 * chain.
1021 */
1022 m0 = m;
1023 id = htonl(ip6_randomid());
1024 if ((error = ip6_fragment(ifp, m, hlen, nextproto, len, id)))
1025 goto sendorfree;
1026
1027 in6_ifstat_inc(ifp, ifs6_out_fragok);
1028 }
1029
1030 /*
1031 * Remove leading garbages.
1032 */
1033 sendorfree:
1034 m = m0->m_nextpkt;
1035 m0->m_nextpkt = 0;
1036 m_freem(m0);
1037 for (; m; m = m0) {
1038 m0 = m->m_nextpkt;
1039 m->m_nextpkt = 0;
1040 if (error == 0) {
1041 /* Record statistics for this interface address. */
1042 if (ia) {
1043 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
1044 counter_u64_add(ia->ia_ifa.ifa_obytes,
1045 m->m_pkthdr.len);
1046 }
1047 #ifdef RATELIMIT
1048 if (inp != NULL) {
1049 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
1050 in_pcboutput_txrtlmt(inp, ifp, m);
1051 /* stamp send tag on mbuf */
1052 m->m_pkthdr.snd_tag = inp->inp_snd_tag;
1053 } else {
1054 m->m_pkthdr.snd_tag = NULL;
1055 }
1056 #endif
1057 error = nd6_output_ifp(ifp, origifp, m, dst,
1058 (struct route *)ro);
1059 #ifdef RATELIMIT
1060 /* check for route change */
1061 if (error == EAGAIN)
1062 in_pcboutput_eagain(inp);
1063 #endif
1064 } else
1065 m_freem(m);
1066 }
1067
1068 if (error == 0)
1069 IP6STAT_INC(ip6s_fragmented);
1070
1071 done:
1072 if (ro == &ip6route)
1073 RO_RTFREE(ro);
1074 return (error);
1075
1076 freehdrs:
1077 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */
1078 m_freem(exthdrs.ip6e_dest1);
1079 m_freem(exthdrs.ip6e_rthdr);
1080 m_freem(exthdrs.ip6e_dest2);
1081 /* FALLTHROUGH */
1082 bad:
1083 if (m)
1084 m_freem(m);
1085 goto done;
1086 }
1087
1088 static int
1089 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1090 {
1091 struct mbuf *m;
1092
1093 if (hlen > MCLBYTES)
1094 return (ENOBUFS); /* XXX */
1095
1096 if (hlen > MLEN)
1097 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1098 else
1099 m = m_get(M_NOWAIT, MT_DATA);
1100 if (m == NULL)
1101 return (ENOBUFS);
1102 m->m_len = hlen;
1103 if (hdr)
1104 bcopy(hdr, mtod(m, caddr_t), hlen);
1105
1106 *mp = m;
1107 return (0);
1108 }
1109
1110 /*
1111 * Insert jumbo payload option.
1112 */
1113 static int
1114 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1115 {
1116 struct mbuf *mopt;
1117 u_char *optbuf;
1118 u_int32_t v;
1119
1120 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */
1121
1122 /*
1123 * If there is no hop-by-hop options header, allocate new one.
1124 * If there is one but it doesn't have enough space to store the
1125 * jumbo payload option, allocate a cluster to store the whole options.
1126 * Otherwise, use it to store the options.
1127 */
1128 if (exthdrs->ip6e_hbh == NULL) {
1129 mopt = m_get(M_NOWAIT, MT_DATA);
1130 if (mopt == NULL)
1131 return (ENOBUFS);
1132 mopt->m_len = JUMBOOPTLEN;
1133 optbuf = mtod(mopt, u_char *);
1134 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */
1135 exthdrs->ip6e_hbh = mopt;
1136 } else {
1137 struct ip6_hbh *hbh;
1138
1139 mopt = exthdrs->ip6e_hbh;
1140 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1141 /*
1142 * XXX assumption:
1143 * - exthdrs->ip6e_hbh is not referenced from places
1144 * other than exthdrs.
1145 * - exthdrs->ip6e_hbh is not an mbuf chain.
1146 */
1147 int oldoptlen = mopt->m_len;
1148 struct mbuf *n;
1149
1150 /*
1151 * XXX: give up if the whole (new) hbh header does
1152 * not fit even in an mbuf cluster.
1153 */
1154 if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1155 return (ENOBUFS);
1156
1157 /*
1158 * As a consequence, we must always prepare a cluster
1159 * at this point.
1160 */
1161 n = m_getcl(M_NOWAIT, MT_DATA, 0);
1162 if (n == NULL)
1163 return (ENOBUFS);
1164 n->m_len = oldoptlen + JUMBOOPTLEN;
1165 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
1166 oldoptlen);
1167 optbuf = mtod(n, caddr_t) + oldoptlen;
1168 m_freem(mopt);
1169 mopt = exthdrs->ip6e_hbh = n;
1170 } else {
1171 optbuf = mtod(mopt, u_char *) + mopt->m_len;
1172 mopt->m_len += JUMBOOPTLEN;
1173 }
1174 optbuf[0] = IP6OPT_PADN;
1175 optbuf[1] = 1;
1176
1177 /*
1178 * Adjust the header length according to the pad and
1179 * the jumbo payload option.
1180 */
1181 hbh = mtod(mopt, struct ip6_hbh *);
1182 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1183 }
1184
1185 /* fill in the option. */
1186 optbuf[2] = IP6OPT_JUMBO;
1187 optbuf[3] = 4;
1188 v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1189 bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1190
1191 /* finally, adjust the packet header length */
1192 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1193
1194 return (0);
1195 #undef JUMBOOPTLEN
1196 }
1197
1198 /*
1199 * Insert fragment header and copy unfragmentable header portions.
1200 */
1201 static int
1202 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1203 struct ip6_frag **frghdrp)
1204 {
1205 struct mbuf *n, *mlast;
1206
1207 if (hlen > sizeof(struct ip6_hdr)) {
1208 n = m_copym(m0, sizeof(struct ip6_hdr),
1209 hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1210 if (n == NULL)
1211 return (ENOBUFS);
1212 m->m_next = n;
1213 } else
1214 n = m;
1215
1216 /* Search for the last mbuf of unfragmentable part. */
1217 for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1218 ;
1219
1220 if (M_WRITABLE(mlast) &&
1221 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1222 /* use the trailing space of the last mbuf for the fragment hdr */
1223 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1224 mlast->m_len);
1225 mlast->m_len += sizeof(struct ip6_frag);
1226 m->m_pkthdr.len += sizeof(struct ip6_frag);
1227 } else {
1228 /* allocate a new mbuf for the fragment header */
1229 struct mbuf *mfrg;
1230
1231 mfrg = m_get(M_NOWAIT, MT_DATA);
1232 if (mfrg == NULL)
1233 return (ENOBUFS);
1234 mfrg->m_len = sizeof(struct ip6_frag);
1235 *frghdrp = mtod(mfrg, struct ip6_frag *);
1236 mlast->m_next = mfrg;
1237 }
1238
1239 return (0);
1240 }
1241
1242 /*
1243 * Calculates IPv6 path mtu for destination @dst.
1244 * Resulting MTU is stored in @mtup.
1245 *
1246 * Returns 0 on success.
1247 */
1248 static int
1249 ip6_getpmtu_ctl(u_int fibnum, const struct in6_addr *dst, u_long *mtup)
1250 {
1251 struct nhop6_extended nh6;
1252 struct in6_addr kdst;
1253 uint32_t scopeid;
1254 struct ifnet *ifp;
1255 u_long mtu;
1256 int error;
1257
1258 in6_splitscope(dst, &kdst, &scopeid);
1259 if (fib6_lookup_nh_ext(fibnum, &kdst, scopeid, NHR_REF, 0, &nh6) != 0)
1260 return (EHOSTUNREACH);
1261
1262 ifp = nh6.nh_ifp;
1263 mtu = nh6.nh_mtu;
1264
1265 error = ip6_calcmtu(ifp, dst, mtu, mtup, NULL, 0);
1266 fib6_free_nh_ext(fibnum, &nh6);
1267
1268 return (error);
1269 }
1270
1271 /*
1272 * Calculates IPv6 path MTU for @dst based on transmit @ifp,
1273 * and cached data in @ro_pmtu.
1274 * MTU from (successful) route lookup is saved (along with dst)
1275 * inside @ro_pmtu to avoid subsequent route lookups after packet
1276 * filter processing.
1277 *
1278 * Stores mtu and always-frag value into @mtup and @alwaysfragp.
1279 * Returns 0 on success.
1280 */
1281 static int
1282 ip6_getpmtu(struct route_in6 *ro_pmtu, int do_lookup,
1283 struct ifnet *ifp, const struct in6_addr *dst, u_long *mtup,
1284 int *alwaysfragp, u_int fibnum, u_int proto)
1285 {
1286 struct nhop6_basic nh6;
1287 struct in6_addr kdst;
1288 uint32_t scopeid;
1289 struct sockaddr_in6 *sa6_dst;
1290 u_long mtu;
1291
1292 mtu = 0;
1293 if (do_lookup) {
1294
1295 /*
1296 * Here ro_pmtu has final destination address, while
1297 * ro might represent immediate destination.
1298 * Use ro_pmtu destination since mtu might differ.
1299 */
1300 sa6_dst = (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1301 if (!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))
1302 ro_pmtu->ro_mtu = 0;
1303
1304 if (ro_pmtu->ro_mtu == 0) {
1305 bzero(sa6_dst, sizeof(*sa6_dst));
1306 sa6_dst->sin6_family = AF_INET6;
1307 sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1308 sa6_dst->sin6_addr = *dst;
1309
1310 in6_splitscope(dst, &kdst, &scopeid);
1311 if (fib6_lookup_nh_basic(fibnum, &kdst, scopeid, 0, 0,
1312 &nh6) == 0)
1313 ro_pmtu->ro_mtu = nh6.nh_mtu;
1314 }
1315
1316 mtu = ro_pmtu->ro_mtu;
1317 }
1318
1319 if (ro_pmtu->ro_rt)
1320 mtu = ro_pmtu->ro_rt->rt_mtu;
1321
1322 return (ip6_calcmtu(ifp, dst, mtu, mtup, alwaysfragp, proto));
1323 }
1324
1325 /*
1326 * Calculate MTU based on transmit @ifp, route mtu @rt_mtu and
1327 * hostcache data for @dst.
1328 * Stores mtu and always-frag value into @mtup and @alwaysfragp.
1329 *
1330 * Returns 0 on success.
1331 */
1332 static int
1333 ip6_calcmtu(struct ifnet *ifp, const struct in6_addr *dst, u_long rt_mtu,
1334 u_long *mtup, int *alwaysfragp, u_int proto)
1335 {
1336 u_long mtu = 0;
1337 int alwaysfrag = 0;
1338 int error = 0;
1339
1340 if (rt_mtu > 0) {
1341 u_int32_t ifmtu;
1342 struct in_conninfo inc;
1343
1344 bzero(&inc, sizeof(inc));
1345 inc.inc_flags |= INC_ISIPV6;
1346 inc.inc6_faddr = *dst;
1347
1348 ifmtu = IN6_LINKMTU(ifp);
1349
1350 /* TCP is known to react to pmtu changes so skip hc */
1351 if (proto != IPPROTO_TCP)
1352 mtu = tcp_hc_getmtu(&inc);
1353
1354 if (mtu)
1355 mtu = min(mtu, rt_mtu);
1356 else
1357 mtu = rt_mtu;
1358 if (mtu == 0)
1359 mtu = ifmtu;
1360 else if (mtu < IPV6_MMTU) {
1361 /*
1362 * RFC2460 section 5, last paragraph:
1363 * if we record ICMPv6 too big message with
1364 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1365 * or smaller, with framgent header attached.
1366 * (fragment header is needed regardless from the
1367 * packet size, for translators to identify packets)
1368 */
1369 alwaysfrag = 1;
1370 mtu = IPV6_MMTU;
1371 }
1372 } else if (ifp) {
1373 mtu = IN6_LINKMTU(ifp);
1374 } else
1375 error = EHOSTUNREACH; /* XXX */
1376
1377 *mtup = mtu;
1378 if (alwaysfragp)
1379 *alwaysfragp = alwaysfrag;
1380 return (error);
1381 }
1382
1383 /*
1384 * IP6 socket option processing.
1385 */
1386 int
1387 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1388 {
1389 int optdatalen, uproto;
1390 void *optdata;
1391 struct inpcb *in6p = sotoinpcb(so);
1392 int error, optval;
1393 int level, op, optname;
1394 int optlen;
1395 struct thread *td;
1396 #ifdef RSS
1397 uint32_t rss_bucket;
1398 int retval;
1399 #endif
1400
1401 /*
1402 * Don't use more than a quarter of mbuf clusters. N.B.:
1403 * nmbclusters is an int, but nmbclusters * MCLBYTES may overflow
1404 * on LP64 architectures, so cast to u_long to avoid undefined
1405 * behavior. ILP32 architectures cannot have nmbclusters
1406 * large enough to overflow for other reasons.
1407 */
1408 #define IPV6_PKTOPTIONS_MBUF_LIMIT ((u_long)nmbclusters * MCLBYTES / 4)
1409
1410 level = sopt->sopt_level;
1411 op = sopt->sopt_dir;
1412 optname = sopt->sopt_name;
1413 optlen = sopt->sopt_valsize;
1414 td = sopt->sopt_td;
1415 error = 0;
1416 optval = 0;
1417 uproto = (int)so->so_proto->pr_protocol;
1418
1419 if (level != IPPROTO_IPV6) {
1420 error = EINVAL;
1421
1422 if (sopt->sopt_level == SOL_SOCKET &&
1423 sopt->sopt_dir == SOPT_SET) {
1424 switch (sopt->sopt_name) {
1425 case SO_REUSEADDR:
1426 INP_WLOCK(in6p);
1427 if ((so->so_options & SO_REUSEADDR) != 0)
1428 in6p->inp_flags2 |= INP_REUSEADDR;
1429 else
1430 in6p->inp_flags2 &= ~INP_REUSEADDR;
1431 INP_WUNLOCK(in6p);
1432 error = 0;
1433 break;
1434 case SO_REUSEPORT:
1435 INP_WLOCK(in6p);
1436 if ((so->so_options & SO_REUSEPORT) != 0)
1437 in6p->inp_flags2 |= INP_REUSEPORT;
1438 else
1439 in6p->inp_flags2 &= ~INP_REUSEPORT;
1440 INP_WUNLOCK(in6p);
1441 error = 0;
1442 break;
1443 case SO_REUSEPORT_LB:
1444 INP_WLOCK(in6p);
1445 if ((so->so_options & SO_REUSEPORT_LB) != 0)
1446 in6p->inp_flags2 |= INP_REUSEPORT_LB;
1447 else
1448 in6p->inp_flags2 &= ~INP_REUSEPORT_LB;
1449 INP_WUNLOCK(in6p);
1450 error = 0;
1451 break;
1452 case SO_SETFIB:
1453 INP_WLOCK(in6p);
1454 in6p->inp_inc.inc_fibnum = so->so_fibnum;
1455 INP_WUNLOCK(in6p);
1456 error = 0;
1457 break;
1458 case SO_MAX_PACING_RATE:
1459 #ifdef RATELIMIT
1460 INP_WLOCK(in6p);
1461 in6p->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
1462 INP_WUNLOCK(in6p);
1463 error = 0;
1464 #else
1465 error = EOPNOTSUPP;
1466 #endif
1467 break;
1468 default:
1469 break;
1470 }
1471 }
1472 } else { /* level == IPPROTO_IPV6 */
1473 switch (op) {
1474
1475 case SOPT_SET:
1476 switch (optname) {
1477 case IPV6_2292PKTOPTIONS:
1478 #ifdef IPV6_PKTOPTIONS
1479 case IPV6_PKTOPTIONS:
1480 #endif
1481 {
1482 struct mbuf *m;
1483
1484 if (optlen > IPV6_PKTOPTIONS_MBUF_LIMIT) {
1485 printf("ip6_ctloutput: mbuf limit hit\n");
1486 error = ENOBUFS;
1487 break;
1488 }
1489
1490 error = soopt_getm(sopt, &m); /* XXX */
1491 if (error != 0)
1492 break;
1493 error = soopt_mcopyin(sopt, m); /* XXX */
1494 if (error != 0)
1495 break;
1496 error = ip6_pcbopts(&in6p->in6p_outputopts,
1497 m, so, sopt);
1498 m_freem(m); /* XXX */
1499 break;
1500 }
1501
1502 /*
1503 * Use of some Hop-by-Hop options or some
1504 * Destination options, might require special
1505 * privilege. That is, normal applications
1506 * (without special privilege) might be forbidden
1507 * from setting certain options in outgoing packets,
1508 * and might never see certain options in received
1509 * packets. [RFC 2292 Section 6]
1510 * KAME specific note:
1511 * KAME prevents non-privileged users from sending or
1512 * receiving ANY hbh/dst options in order to avoid
1513 * overhead of parsing options in the kernel.
1514 */
1515 case IPV6_RECVHOPOPTS:
1516 case IPV6_RECVDSTOPTS:
1517 case IPV6_RECVRTHDRDSTOPTS:
1518 if (td != NULL) {
1519 error = priv_check(td,
1520 PRIV_NETINET_SETHDROPTS);
1521 if (error)
1522 break;
1523 }
1524 /* FALLTHROUGH */
1525 case IPV6_UNICAST_HOPS:
1526 case IPV6_HOPLIMIT:
1527
1528 case IPV6_RECVPKTINFO:
1529 case IPV6_RECVHOPLIMIT:
1530 case IPV6_RECVRTHDR:
1531 case IPV6_RECVPATHMTU:
1532 case IPV6_RECVTCLASS:
1533 case IPV6_RECVFLOWID:
1534 #ifdef RSS
1535 case IPV6_RECVRSSBUCKETID:
1536 #endif
1537 case IPV6_V6ONLY:
1538 case IPV6_AUTOFLOWLABEL:
1539 case IPV6_ORIGDSTADDR:
1540 case IPV6_BINDANY:
1541 case IPV6_BINDMULTI:
1542 #ifdef RSS
1543 case IPV6_RSS_LISTEN_BUCKET:
1544 #endif
1545 if (optname == IPV6_BINDANY && td != NULL) {
1546 error = priv_check(td,
1547 PRIV_NETINET_BINDANY);
1548 if (error)
1549 break;
1550 }
1551
1552 if (optlen != sizeof(int)) {
1553 error = EINVAL;
1554 break;
1555 }
1556 error = sooptcopyin(sopt, &optval,
1557 sizeof optval, sizeof optval);
1558 if (error)
1559 break;
1560 switch (optname) {
1561
1562 case IPV6_UNICAST_HOPS:
1563 if (optval < -1 || optval >= 256)
1564 error = EINVAL;
1565 else {
1566 /* -1 = kernel default */
1567 in6p->in6p_hops = optval;
1568 if ((in6p->inp_vflag &
1569 INP_IPV4) != 0)
1570 in6p->inp_ip_ttl = optval;
1571 }
1572 break;
1573 #define OPTSET(bit) \
1574 do { \
1575 INP_WLOCK(in6p); \
1576 if (optval) \
1577 in6p->inp_flags |= (bit); \
1578 else \
1579 in6p->inp_flags &= ~(bit); \
1580 INP_WUNLOCK(in6p); \
1581 } while (/*CONSTCOND*/ 0)
1582 #define OPTSET2292(bit) \
1583 do { \
1584 INP_WLOCK(in6p); \
1585 in6p->inp_flags |= IN6P_RFC2292; \
1586 if (optval) \
1587 in6p->inp_flags |= (bit); \
1588 else \
1589 in6p->inp_flags &= ~(bit); \
1590 INP_WUNLOCK(in6p); \
1591 } while (/*CONSTCOND*/ 0)
1592 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0)
1593
1594 #define OPTSET2_N(bit, val) do { \
1595 if (val) \
1596 in6p->inp_flags2 |= bit; \
1597 else \
1598 in6p->inp_flags2 &= ~bit; \
1599 } while (0)
1600 #define OPTSET2(bit, val) do { \
1601 INP_WLOCK(in6p); \
1602 OPTSET2_N(bit, val); \
1603 INP_WUNLOCK(in6p); \
1604 } while (0)
1605 #define OPTBIT2(bit) (in6p->inp_flags2 & (bit) ? 1 : 0)
1606 #define OPTSET2292_EXCLUSIVE(bit) \
1607 do { \
1608 INP_WLOCK(in6p); \
1609 if (OPTBIT(IN6P_RFC2292)) { \
1610 error = EINVAL; \
1611 } else { \
1612 if (optval) \
1613 in6p->inp_flags |= (bit); \
1614 else \
1615 in6p->inp_flags &= ~(bit); \
1616 } \
1617 INP_WUNLOCK(in6p); \
1618 } while (/*CONSTCOND*/ 0)
1619
1620 case IPV6_RECVPKTINFO:
1621 OPTSET2292_EXCLUSIVE(IN6P_PKTINFO);
1622 break;
1623
1624 case IPV6_HOPLIMIT:
1625 {
1626 struct ip6_pktopts **optp;
1627
1628 /* cannot mix with RFC2292 */
1629 if (OPTBIT(IN6P_RFC2292)) {
1630 error = EINVAL;
1631 break;
1632 }
1633 INP_WLOCK(in6p);
1634 if (in6p->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1635 INP_WUNLOCK(in6p);
1636 return (ECONNRESET);
1637 }
1638 optp = &in6p->in6p_outputopts;
1639 error = ip6_pcbopt(IPV6_HOPLIMIT,
1640 (u_char *)&optval, sizeof(optval),
1641 optp, (td != NULL) ? td->td_ucred :
1642 NULL, uproto);
1643 INP_WUNLOCK(in6p);
1644 break;
1645 }
1646
1647 case IPV6_RECVHOPLIMIT:
1648 OPTSET2292_EXCLUSIVE(IN6P_HOPLIMIT);
1649 break;
1650
1651 case IPV6_RECVHOPOPTS:
1652 OPTSET2292_EXCLUSIVE(IN6P_HOPOPTS);
1653 break;
1654
1655 case IPV6_RECVDSTOPTS:
1656 OPTSET2292_EXCLUSIVE(IN6P_DSTOPTS);
1657 break;
1658
1659 case IPV6_RECVRTHDRDSTOPTS:
1660 OPTSET2292_EXCLUSIVE(IN6P_RTHDRDSTOPTS);
1661 break;
1662
1663 case IPV6_RECVRTHDR:
1664 OPTSET2292_EXCLUSIVE(IN6P_RTHDR);
1665 break;
1666
1667 case IPV6_RECVPATHMTU:
1668 /*
1669 * We ignore this option for TCP
1670 * sockets.
1671 * (RFC3542 leaves this case
1672 * unspecified.)
1673 */
1674 if (uproto != IPPROTO_TCP)
1675 OPTSET(IN6P_MTU);
1676 break;
1677
1678 case IPV6_RECVFLOWID:
1679 OPTSET2(INP_RECVFLOWID, optval);
1680 break;
1681
1682 #ifdef RSS
1683 case IPV6_RECVRSSBUCKETID:
1684 OPTSET2(INP_RECVRSSBUCKETID, optval);
1685 break;
1686 #endif
1687
1688 case IPV6_V6ONLY:
1689 /*
1690 * make setsockopt(IPV6_V6ONLY)
1691 * available only prior to bind(2).
1692 * see ipng mailing list, Jun 22 2001.
1693 */
1694 if (in6p->inp_lport ||
1695 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1696 error = EINVAL;
1697 break;
1698 }
1699 OPTSET(IN6P_IPV6_V6ONLY);
1700 if (optval)
1701 in6p->inp_vflag &= ~INP_IPV4;
1702 else
1703 in6p->inp_vflag |= INP_IPV4;
1704 break;
1705 case IPV6_RECVTCLASS:
1706 /* cannot mix with RFC2292 XXX */
1707 OPTSET2292_EXCLUSIVE(IN6P_TCLASS);
1708 break;
1709 case IPV6_AUTOFLOWLABEL:
1710 OPTSET(IN6P_AUTOFLOWLABEL);
1711 break;
1712
1713 case IPV6_ORIGDSTADDR:
1714 OPTSET2(INP_ORIGDSTADDR, optval);
1715 break;
1716 case IPV6_BINDANY:
1717 OPTSET(INP_BINDANY);
1718 break;
1719
1720 case IPV6_BINDMULTI:
1721 OPTSET2(INP_BINDMULTI, optval);
1722 break;
1723 #ifdef RSS
1724 case IPV6_RSS_LISTEN_BUCKET:
1725 if ((optval >= 0) &&
1726 (optval < rss_getnumbuckets())) {
1727 INP_WLOCK(in6p);
1728 in6p->inp_rss_listen_bucket = optval;
1729 OPTSET2_N(INP_RSS_BUCKET_SET, 1);
1730 INP_WUNLOCK(in6p);
1731 } else {
1732 error = EINVAL;
1733 }
1734 break;
1735 #endif
1736 }
1737 break;
1738
1739 case IPV6_TCLASS:
1740 case IPV6_DONTFRAG:
1741 case IPV6_USE_MIN_MTU:
1742 case IPV6_PREFER_TEMPADDR:
1743 if (optlen != sizeof(optval)) {
1744 error = EINVAL;
1745 break;
1746 }
1747 error = sooptcopyin(sopt, &optval,
1748 sizeof optval, sizeof optval);
1749 if (error)
1750 break;
1751 {
1752 struct ip6_pktopts **optp;
1753 INP_WLOCK(in6p);
1754 if (in6p->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1755 INP_WUNLOCK(in6p);
1756 return (ECONNRESET);
1757 }
1758 optp = &in6p->in6p_outputopts;
1759 error = ip6_pcbopt(optname,
1760 (u_char *)&optval, sizeof(optval),
1761 optp, (td != NULL) ? td->td_ucred :
1762 NULL, uproto);
1763 INP_WUNLOCK(in6p);
1764 break;
1765 }
1766
1767 case IPV6_2292PKTINFO:
1768 case IPV6_2292HOPLIMIT:
1769 case IPV6_2292HOPOPTS:
1770 case IPV6_2292DSTOPTS:
1771 case IPV6_2292RTHDR:
1772 /* RFC 2292 */
1773 if (optlen != sizeof(int)) {
1774 error = EINVAL;
1775 break;
1776 }
1777 error = sooptcopyin(sopt, &optval,
1778 sizeof optval, sizeof optval);
1779 if (error)
1780 break;
1781 switch (optname) {
1782 case IPV6_2292PKTINFO:
1783 OPTSET2292(IN6P_PKTINFO);
1784 break;
1785 case IPV6_2292HOPLIMIT:
1786 OPTSET2292(IN6P_HOPLIMIT);
1787 break;
1788 case IPV6_2292HOPOPTS:
1789 /*
1790 * Check super-user privilege.
1791 * See comments for IPV6_RECVHOPOPTS.
1792 */
1793 if (td != NULL) {
1794 error = priv_check(td,
1795 PRIV_NETINET_SETHDROPTS);
1796 if (error)
1797 return (error);
1798 }
1799 OPTSET2292(IN6P_HOPOPTS);
1800 break;
1801 case IPV6_2292DSTOPTS:
1802 if (td != NULL) {
1803 error = priv_check(td,
1804 PRIV_NETINET_SETHDROPTS);
1805 if (error)
1806 return (error);
1807 }
1808 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1809 break;
1810 case IPV6_2292RTHDR:
1811 OPTSET2292(IN6P_RTHDR);
1812 break;
1813 }
1814 break;
1815 case IPV6_PKTINFO:
1816 case IPV6_HOPOPTS:
1817 case IPV6_RTHDR:
1818 case IPV6_DSTOPTS:
1819 case IPV6_RTHDRDSTOPTS:
1820 case IPV6_NEXTHOP:
1821 {
1822 /* new advanced API (RFC3542) */
1823 u_char *optbuf;
1824 u_char optbuf_storage[MCLBYTES];
1825 int optlen;
1826 struct ip6_pktopts **optp;
1827
1828 /* cannot mix with RFC2292 */
1829 if (OPTBIT(IN6P_RFC2292)) {
1830 error = EINVAL;
1831 break;
1832 }
1833
1834 /*
1835 * We only ensure valsize is not too large
1836 * here. Further validation will be done
1837 * later.
1838 */
1839 error = sooptcopyin(sopt, optbuf_storage,
1840 sizeof(optbuf_storage), 0);
1841 if (error)
1842 break;
1843 optlen = sopt->sopt_valsize;
1844 optbuf = optbuf_storage;
1845 INP_WLOCK(in6p);
1846 if (in6p->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1847 INP_WUNLOCK(in6p);
1848 return (ECONNRESET);
1849 }
1850 optp = &in6p->in6p_outputopts;
1851 error = ip6_pcbopt(optname, optbuf, optlen,
1852 optp, (td != NULL) ? td->td_ucred : NULL,
1853 uproto);
1854 INP_WUNLOCK(in6p);
1855 break;
1856 }
1857 #undef OPTSET
1858
1859 case IPV6_MULTICAST_IF:
1860 case IPV6_MULTICAST_HOPS:
1861 case IPV6_MULTICAST_LOOP:
1862 case IPV6_JOIN_GROUP:
1863 case IPV6_LEAVE_GROUP:
1864 case IPV6_MSFILTER:
1865 case MCAST_BLOCK_SOURCE:
1866 case MCAST_UNBLOCK_SOURCE:
1867 case MCAST_JOIN_GROUP:
1868 case MCAST_LEAVE_GROUP:
1869 case MCAST_JOIN_SOURCE_GROUP:
1870 case MCAST_LEAVE_SOURCE_GROUP:
1871 error = ip6_setmoptions(in6p, sopt);
1872 break;
1873
1874 case IPV6_PORTRANGE:
1875 error = sooptcopyin(sopt, &optval,
1876 sizeof optval, sizeof optval);
1877 if (error)
1878 break;
1879
1880 INP_WLOCK(in6p);
1881 switch (optval) {
1882 case IPV6_PORTRANGE_DEFAULT:
1883 in6p->inp_flags &= ~(INP_LOWPORT);
1884 in6p->inp_flags &= ~(INP_HIGHPORT);
1885 break;
1886
1887 case IPV6_PORTRANGE_HIGH:
1888 in6p->inp_flags &= ~(INP_LOWPORT);
1889 in6p->inp_flags |= INP_HIGHPORT;
1890 break;
1891
1892 case IPV6_PORTRANGE_LOW:
1893 in6p->inp_flags &= ~(INP_HIGHPORT);
1894 in6p->inp_flags |= INP_LOWPORT;
1895 break;
1896
1897 default:
1898 error = EINVAL;
1899 break;
1900 }
1901 INP_WUNLOCK(in6p);
1902 break;
1903
1904 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1905 case IPV6_IPSEC_POLICY:
1906 if (IPSEC_ENABLED(ipv6)) {
1907 error = IPSEC_PCBCTL(ipv6, in6p, sopt);
1908 break;
1909 }
1910 /* FALLTHROUGH */
1911 #endif /* IPSEC */
1912
1913 default:
1914 error = ENOPROTOOPT;
1915 break;
1916 }
1917 break;
1918
1919 case SOPT_GET:
1920 switch (optname) {
1921
1922 case IPV6_2292PKTOPTIONS:
1923 #ifdef IPV6_PKTOPTIONS
1924 case IPV6_PKTOPTIONS:
1925 #endif
1926 /*
1927 * RFC3542 (effectively) deprecated the
1928 * semantics of the 2292-style pktoptions.
1929 * Since it was not reliable in nature (i.e.,
1930 * applications had to expect the lack of some
1931 * information after all), it would make sense
1932 * to simplify this part by always returning
1933 * empty data.
1934 */
1935 sopt->sopt_valsize = 0;
1936 break;
1937
1938 case IPV6_RECVHOPOPTS:
1939 case IPV6_RECVDSTOPTS:
1940 case IPV6_RECVRTHDRDSTOPTS:
1941 case IPV6_UNICAST_HOPS:
1942 case IPV6_RECVPKTINFO:
1943 case IPV6_RECVHOPLIMIT:
1944 case IPV6_RECVRTHDR:
1945 case IPV6_RECVPATHMTU:
1946
1947 case IPV6_V6ONLY:
1948 case IPV6_PORTRANGE:
1949 case IPV6_RECVTCLASS:
1950 case IPV6_AUTOFLOWLABEL:
1951 case IPV6_BINDANY:
1952 case IPV6_FLOWID:
1953 case IPV6_FLOWTYPE:
1954 case IPV6_RECVFLOWID:
1955 #ifdef RSS
1956 case IPV6_RSSBUCKETID:
1957 case IPV6_RECVRSSBUCKETID:
1958 #endif
1959 case IPV6_BINDMULTI:
1960 switch (optname) {
1961
1962 case IPV6_RECVHOPOPTS:
1963 optval = OPTBIT(IN6P_HOPOPTS);
1964 break;
1965
1966 case IPV6_RECVDSTOPTS:
1967 optval = OPTBIT(IN6P_DSTOPTS);
1968 break;
1969
1970 case IPV6_RECVRTHDRDSTOPTS:
1971 optval = OPTBIT(IN6P_RTHDRDSTOPTS);
1972 break;
1973
1974 case IPV6_UNICAST_HOPS:
1975 optval = in6p->in6p_hops;
1976 break;
1977
1978 case IPV6_RECVPKTINFO:
1979 optval = OPTBIT(IN6P_PKTINFO);
1980 break;
1981
1982 case IPV6_RECVHOPLIMIT:
1983 optval = OPTBIT(IN6P_HOPLIMIT);
1984 break;
1985
1986 case IPV6_RECVRTHDR:
1987 optval = OPTBIT(IN6P_RTHDR);
1988 break;
1989
1990 case IPV6_RECVPATHMTU:
1991 optval = OPTBIT(IN6P_MTU);
1992 break;
1993
1994 case IPV6_V6ONLY:
1995 optval = OPTBIT(IN6P_IPV6_V6ONLY);
1996 break;
1997
1998 case IPV6_PORTRANGE:
1999 {
2000 int flags;
2001 flags = in6p->inp_flags;
2002 if (flags & INP_HIGHPORT)
2003 optval = IPV6_PORTRANGE_HIGH;
2004 else if (flags & INP_LOWPORT)
2005 optval = IPV6_PORTRANGE_LOW;
2006 else
2007 optval = 0;
2008 break;
2009 }
2010 case IPV6_RECVTCLASS:
2011 optval = OPTBIT(IN6P_TCLASS);
2012 break;
2013
2014 case IPV6_AUTOFLOWLABEL:
2015 optval = OPTBIT(IN6P_AUTOFLOWLABEL);
2016 break;
2017
2018 case IPV6_ORIGDSTADDR:
2019 optval = OPTBIT2(INP_ORIGDSTADDR);
2020 break;
2021
2022 case IPV6_BINDANY:
2023 optval = OPTBIT(INP_BINDANY);
2024 break;
2025
2026 case IPV6_FLOWID:
2027 optval = in6p->inp_flowid;
2028 break;
2029
2030 case IPV6_FLOWTYPE:
2031 optval = in6p->inp_flowtype;
2032 break;
2033
2034 case IPV6_RECVFLOWID:
2035 optval = OPTBIT2(INP_RECVFLOWID);
2036 break;
2037 #ifdef RSS
2038 case IPV6_RSSBUCKETID:
2039 retval =
2040 rss_hash2bucket(in6p->inp_flowid,
2041 in6p->inp_flowtype,
2042 &rss_bucket);
2043 if (retval == 0)
2044 optval = rss_bucket;
2045 else
2046 error = EINVAL;
2047 break;
2048
2049 case IPV6_RECVRSSBUCKETID:
2050 optval = OPTBIT2(INP_RECVRSSBUCKETID);
2051 break;
2052 #endif
2053
2054 case IPV6_BINDMULTI:
2055 optval = OPTBIT2(INP_BINDMULTI);
2056 break;
2057
2058 }
2059 if (error)
2060 break;
2061 error = sooptcopyout(sopt, &optval,
2062 sizeof optval);
2063 break;
2064
2065 case IPV6_PATHMTU:
2066 {
2067 u_long pmtu = 0;
2068 struct ip6_mtuinfo mtuinfo;
2069 struct in6_addr addr;
2070
2071 if (!(so->so_state & SS_ISCONNECTED))
2072 return (ENOTCONN);
2073 /*
2074 * XXX: we dot not consider the case of source
2075 * routing, or optional information to specify
2076 * the outgoing interface.
2077 * Copy faddr out of in6p to avoid holding lock
2078 * on inp during route lookup.
2079 */
2080 INP_RLOCK(in6p);
2081 bcopy(&in6p->in6p_faddr, &addr, sizeof(addr));
2082 INP_RUNLOCK(in6p);
2083 error = ip6_getpmtu_ctl(so->so_fibnum,
2084 &addr, &pmtu);
2085 if (error)
2086 break;
2087 if (pmtu > IPV6_MAXPACKET)
2088 pmtu = IPV6_MAXPACKET;
2089
2090 bzero(&mtuinfo, sizeof(mtuinfo));
2091 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
2092 optdata = (void *)&mtuinfo;
2093 optdatalen = sizeof(mtuinfo);
2094 error = sooptcopyout(sopt, optdata,
2095 optdatalen);
2096 break;
2097 }
2098
2099 case IPV6_2292PKTINFO:
2100 case IPV6_2292HOPLIMIT:
2101 case IPV6_2292HOPOPTS:
2102 case IPV6_2292RTHDR:
2103 case IPV6_2292DSTOPTS:
2104 switch (optname) {
2105 case IPV6_2292PKTINFO:
2106 optval = OPTBIT(IN6P_PKTINFO);
2107 break;
2108 case IPV6_2292HOPLIMIT:
2109 optval = OPTBIT(IN6P_HOPLIMIT);
2110 break;
2111 case IPV6_2292HOPOPTS:
2112 optval = OPTBIT(IN6P_HOPOPTS);
2113 break;
2114 case IPV6_2292RTHDR:
2115 optval = OPTBIT(IN6P_RTHDR);
2116 break;
2117 case IPV6_2292DSTOPTS:
2118 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
2119 break;
2120 }
2121 error = sooptcopyout(sopt, &optval,
2122 sizeof optval);
2123 break;
2124 case IPV6_PKTINFO:
2125 case IPV6_HOPOPTS:
2126 case IPV6_RTHDR:
2127 case IPV6_DSTOPTS:
2128 case IPV6_RTHDRDSTOPTS:
2129 case IPV6_NEXTHOP:
2130 case IPV6_TCLASS:
2131 case IPV6_DONTFRAG:
2132 case IPV6_USE_MIN_MTU:
2133 case IPV6_PREFER_TEMPADDR:
2134 error = ip6_getpcbopt(in6p, optname, sopt);
2135 break;
2136
2137 case IPV6_MULTICAST_IF:
2138 case IPV6_MULTICAST_HOPS:
2139 case IPV6_MULTICAST_LOOP:
2140 case IPV6_MSFILTER:
2141 error = ip6_getmoptions(in6p, sopt);
2142 break;
2143
2144 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
2145 case IPV6_IPSEC_POLICY:
2146 if (IPSEC_ENABLED(ipv6)) {
2147 error = IPSEC_PCBCTL(ipv6, in6p, sopt);
2148 break;
2149 }
2150 /* FALLTHROUGH */
2151 #endif /* IPSEC */
2152 default:
2153 error = ENOPROTOOPT;
2154 break;
2155 }
2156 break;
2157 }
2158 }
2159 return (error);
2160 }
2161
2162 int
2163 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2164 {
2165 int error = 0, optval, optlen;
2166 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2167 struct inpcb *in6p = sotoinpcb(so);
2168 int level, op, optname;
2169
2170 level = sopt->sopt_level;
2171 op = sopt->sopt_dir;
2172 optname = sopt->sopt_name;
2173 optlen = sopt->sopt_valsize;
2174
2175 if (level != IPPROTO_IPV6) {
2176 return (EINVAL);
2177 }
2178
2179 switch (optname) {
2180 case IPV6_CHECKSUM:
2181 /*
2182 * For ICMPv6 sockets, no modification allowed for checksum
2183 * offset, permit "no change" values to help existing apps.
2184 *
2185 * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2186 * for an ICMPv6 socket will fail."
2187 * The current behavior does not meet RFC3542.
2188 */
2189 switch (op) {
2190 case SOPT_SET:
2191 if (optlen != sizeof(int)) {
2192 error = EINVAL;
2193 break;
2194 }
2195 error = sooptcopyin(sopt, &optval, sizeof(optval),
2196 sizeof(optval));
2197 if (error)
2198 break;
2199 if ((optval % 2) != 0) {
2200 /* the API assumes even offset values */
2201 error = EINVAL;
2202 } else if (so->so_proto->pr_protocol ==
2203 IPPROTO_ICMPV6) {
2204 if (optval != icmp6off)
2205 error = EINVAL;
2206 } else
2207 in6p->in6p_cksum = optval;
2208 break;
2209
2210 case SOPT_GET:
2211 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
2212 optval = icmp6off;
2213 else
2214 optval = in6p->in6p_cksum;
2215
2216 error = sooptcopyout(sopt, &optval, sizeof(optval));
2217 break;
2218
2219 default:
2220 error = EINVAL;
2221 break;
2222 }
2223 break;
2224
2225 default:
2226 error = ENOPROTOOPT;
2227 break;
2228 }
2229
2230 return (error);
2231 }
2232
2233 /*
2234 * Set up IP6 options in pcb for insertion in output packets or
2235 * specifying behavior of outgoing packets.
2236 */
2237 static int
2238 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2239 struct socket *so, struct sockopt *sopt)
2240 {
2241 struct ip6_pktopts *opt = *pktopt;
2242 int error = 0;
2243 struct thread *td = sopt->sopt_td;
2244
2245 /* turn off any old options. */
2246 if (opt) {
2247 #ifdef DIAGNOSTIC
2248 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2249 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2250 opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2251 printf("ip6_pcbopts: all specified options are cleared.\n");
2252 #endif
2253 ip6_clearpktopts(opt, -1);
2254 } else
2255 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2256 *pktopt = NULL;
2257
2258 if (!m || m->m_len == 0) {
2259 /*
2260 * Only turning off any previous options, regardless of
2261 * whether the opt is just created or given.
2262 */
2263 free(opt, M_IP6OPT);
2264 return (0);
2265 }
2266
2267 /* set options specified by user. */
2268 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2269 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2270 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2271 free(opt, M_IP6OPT);
2272 return (error);
2273 }
2274 *pktopt = opt;
2275 return (0);
2276 }
2277
2278 /*
2279 * initialize ip6_pktopts. beware that there are non-zero default values in
2280 * the struct.
2281 */
2282 void
2283 ip6_initpktopts(struct ip6_pktopts *opt)
2284 {
2285
2286 bzero(opt, sizeof(*opt));
2287 opt->ip6po_hlim = -1; /* -1 means default hop limit */
2288 opt->ip6po_tclass = -1; /* -1 means default traffic class */
2289 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2290 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2291 }
2292
2293 static int
2294 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2295 struct ucred *cred, int uproto)
2296 {
2297 struct ip6_pktopts *opt;
2298
2299 if (*pktopt == NULL) {
2300 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2301 M_NOWAIT);
2302 if (*pktopt == NULL)
2303 return (ENOBUFS);
2304 ip6_initpktopts(*pktopt);
2305 }
2306 opt = *pktopt;
2307
2308 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
2309 }
2310
2311 #define GET_PKTOPT_VAR(field, lenexpr) do { \
2312 if (pktopt && pktopt->field) { \
2313 INP_RUNLOCK(in6p); \
2314 optdata = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK); \
2315 malloc_optdata = true; \
2316 INP_RLOCK(in6p); \
2317 if (in6p->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \
2318 INP_RUNLOCK(in6p); \
2319 free(optdata, M_TEMP); \
2320 return (ECONNRESET); \
2321 } \
2322 pktopt = in6p->in6p_outputopts; \
2323 if (pktopt && pktopt->field) { \
2324 optdatalen = min(lenexpr, sopt->sopt_valsize); \
2325 bcopy(&pktopt->field, optdata, optdatalen); \
2326 } else { \
2327 free(optdata, M_TEMP); \
2328 optdata = NULL; \
2329 malloc_optdata = false; \
2330 } \
2331 } \
2332 } while(0)
2333
2334 #define GET_PKTOPT_EXT_HDR(field) GET_PKTOPT_VAR(field, \
2335 (((struct ip6_ext *)pktopt->field)->ip6e_len + 1) << 3)
2336
2337 #define GET_PKTOPT_SOCKADDR(field) GET_PKTOPT_VAR(field, \
2338 pktopt->field->sa_len)
2339
2340 static int
2341 ip6_getpcbopt(struct inpcb *in6p, int optname, struct sockopt *sopt)
2342 {
2343 void *optdata = NULL;
2344 bool malloc_optdata = false;
2345 int optdatalen = 0;
2346 int error = 0;
2347 struct in6_pktinfo null_pktinfo;
2348 int deftclass = 0, on;
2349 int defminmtu = IP6PO_MINMTU_MCASTONLY;
2350 int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2351 struct ip6_pktopts *pktopt;
2352
2353 INP_RLOCK(in6p);
2354 pktopt = in6p->in6p_outputopts;
2355
2356 switch (optname) {
2357 case IPV6_PKTINFO:
2358 optdata = (void *)&null_pktinfo;
2359 if (pktopt && pktopt->ip6po_pktinfo) {
2360 bcopy(pktopt->ip6po_pktinfo, &null_pktinfo,
2361 sizeof(null_pktinfo));
2362 in6_clearscope(&null_pktinfo.ipi6_addr);
2363 } else {
2364 /* XXX: we don't have to do this every time... */
2365 bzero(&null_pktinfo, sizeof(null_pktinfo));
2366 }
2367 optdatalen = sizeof(struct in6_pktinfo);
2368 break;
2369 case IPV6_TCLASS:
2370 if (pktopt && pktopt->ip6po_tclass >= 0)
2371 deftclass = pktopt->ip6po_tclass;
2372 optdata = (void *)&deftclass;
2373 optdatalen = sizeof(int);
2374 break;
2375 case IPV6_HOPOPTS:
2376 GET_PKTOPT_EXT_HDR(ip6po_hbh);
2377 break;
2378 case IPV6_RTHDR:
2379 GET_PKTOPT_EXT_HDR(ip6po_rthdr);
2380 break;
2381 case IPV6_RTHDRDSTOPTS:
2382 GET_PKTOPT_EXT_HDR(ip6po_dest1);
2383 break;
2384 case IPV6_DSTOPTS:
2385 GET_PKTOPT_EXT_HDR(ip6po_dest2);
2386 break;
2387 case IPV6_NEXTHOP:
2388 GET_PKTOPT_SOCKADDR(ip6po_nexthop);
2389 break;
2390 case IPV6_USE_MIN_MTU:
2391 if (pktopt)
2392 defminmtu = pktopt->ip6po_minmtu;
2393 optdata = (void *)&defminmtu;
2394 optdatalen = sizeof(int);
2395 break;
2396 case IPV6_DONTFRAG:
2397 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2398 on = 1;
2399 else
2400 on = 0;
2401 optdata = (void *)&on;
2402 optdatalen = sizeof(on);
2403 break;
2404 case IPV6_PREFER_TEMPADDR:
2405 if (pktopt)
2406 defpreftemp = pktopt->ip6po_prefer_tempaddr;
2407 optdata = (void *)&defpreftemp;
2408 optdatalen = sizeof(int);
2409 break;
2410 default: /* should not happen */
2411 #ifdef DIAGNOSTIC
2412 panic("ip6_getpcbopt: unexpected option\n");
2413 #endif
2414 INP_RUNLOCK(in6p);
2415 return (ENOPROTOOPT);
2416 }
2417 INP_RUNLOCK(in6p);
2418
2419 error = sooptcopyout(sopt, optdata, optdatalen);
2420 if (malloc_optdata)
2421 free(optdata, M_TEMP);
2422
2423 return (error);
2424 }
2425
2426 void
2427 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2428 {
2429 if (pktopt == NULL)
2430 return;
2431
2432 if (optname == -1 || optname == IPV6_PKTINFO) {
2433 if (pktopt->ip6po_pktinfo)
2434 free(pktopt->ip6po_pktinfo, M_IP6OPT);
2435 pktopt->ip6po_pktinfo = NULL;
2436 }
2437 if (optname == -1 || optname == IPV6_HOPLIMIT)
2438 pktopt->ip6po_hlim = -1;
2439 if (optname == -1 || optname == IPV6_TCLASS)
2440 pktopt->ip6po_tclass = -1;
2441 if (optname == -1 || optname == IPV6_NEXTHOP) {
2442 if (pktopt->ip6po_nextroute.ro_rt) {
2443 RTFREE(pktopt->ip6po_nextroute.ro_rt);
2444 pktopt->ip6po_nextroute.ro_rt = NULL;
2445 }
2446 if (pktopt->ip6po_nexthop)
2447 free(pktopt->ip6po_nexthop, M_IP6OPT);
2448 pktopt->ip6po_nexthop = NULL;
2449 }
2450 if (optname == -1 || optname == IPV6_HOPOPTS) {
2451 if (pktopt->ip6po_hbh)
2452 free(pktopt->ip6po_hbh, M_IP6OPT);
2453 pktopt->ip6po_hbh = NULL;
2454 }
2455 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2456 if (pktopt->ip6po_dest1)
2457 free(pktopt->ip6po_dest1, M_IP6OPT);
2458 pktopt->ip6po_dest1 = NULL;
2459 }
2460 if (optname == -1 || optname == IPV6_RTHDR) {
2461 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2462 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2463 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2464 if (pktopt->ip6po_route.ro_rt) {
2465 RTFREE(pktopt->ip6po_route.ro_rt);
2466 pktopt->ip6po_route.ro_rt = NULL;
2467 }
2468 }
2469 if (optname == -1 || optname == IPV6_DSTOPTS) {
2470 if (pktopt->ip6po_dest2)
2471 free(pktopt->ip6po_dest2, M_IP6OPT);
2472 pktopt->ip6po_dest2 = NULL;
2473 }
2474 }
2475
2476 #define PKTOPT_EXTHDRCPY(type) \
2477 do {\
2478 if (src->type) {\
2479 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2480 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2481 if (dst->type == NULL)\
2482 goto bad;\
2483 bcopy(src->type, dst->type, hlen);\
2484 }\
2485 } while (/*CONSTCOND*/ 0)
2486
2487 static int
2488 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2489 {
2490 if (dst == NULL || src == NULL) {
2491 printf("ip6_clearpktopts: invalid argument\n");
2492 return (EINVAL);
2493 }
2494
2495 dst->ip6po_hlim = src->ip6po_hlim;
2496 dst->ip6po_tclass = src->ip6po_tclass;
2497 dst->ip6po_flags = src->ip6po_flags;
2498 dst->ip6po_minmtu = src->ip6po_minmtu;
2499 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2500 if (src->ip6po_pktinfo) {
2501 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2502 M_IP6OPT, canwait);
2503 if (dst->ip6po_pktinfo == NULL)
2504 goto bad;
2505 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2506 }
2507 if (src->ip6po_nexthop) {
2508 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2509 M_IP6OPT, canwait);
2510 if (dst->ip6po_nexthop == NULL)
2511 goto bad;
2512 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2513 src->ip6po_nexthop->sa_len);
2514 }
2515 PKTOPT_EXTHDRCPY(ip6po_hbh);
2516 PKTOPT_EXTHDRCPY(ip6po_dest1);
2517 PKTOPT_EXTHDRCPY(ip6po_dest2);
2518 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2519 return (0);
2520
2521 bad:
2522 ip6_clearpktopts(dst, -1);
2523 return (ENOBUFS);
2524 }
2525 #undef PKTOPT_EXTHDRCPY
2526
2527 struct ip6_pktopts *
2528 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2529 {
2530 int error;
2531 struct ip6_pktopts *dst;
2532
2533 dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2534 if (dst == NULL)
2535 return (NULL);
2536 ip6_initpktopts(dst);
2537
2538 if ((error = copypktopts(dst, src, canwait)) != 0) {
2539 free(dst, M_IP6OPT);
2540 return (NULL);
2541 }
2542
2543 return (dst);
2544 }
2545
2546 void
2547 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2548 {
2549 if (pktopt == NULL)
2550 return;
2551
2552 ip6_clearpktopts(pktopt, -1);
2553
2554 free(pktopt, M_IP6OPT);
2555 }
2556
2557 /*
2558 * Set IPv6 outgoing packet options based on advanced API.
2559 */
2560 int
2561 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2562 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2563 {
2564 struct cmsghdr *cm = NULL;
2565
2566 if (control == NULL || opt == NULL)
2567 return (EINVAL);
2568
2569 ip6_initpktopts(opt);
2570 if (stickyopt) {
2571 int error;
2572
2573 /*
2574 * If stickyopt is provided, make a local copy of the options
2575 * for this particular packet, then override them by ancillary
2576 * objects.
2577 * XXX: copypktopts() does not copy the cached route to a next
2578 * hop (if any). This is not very good in terms of efficiency,
2579 * but we can allow this since this option should be rarely
2580 * used.
2581 */
2582 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2583 return (error);
2584 }
2585
2586 /*
2587 * XXX: Currently, we assume all the optional information is stored
2588 * in a single mbuf.
2589 */
2590 if (control->m_next)
2591 return (EINVAL);
2592
2593 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2594 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2595 int error;
2596
2597 if (control->m_len < CMSG_LEN(0))
2598 return (EINVAL);
2599
2600 cm = mtod(control, struct cmsghdr *);
2601 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2602 return (EINVAL);
2603 if (cm->cmsg_level != IPPROTO_IPV6)
2604 continue;
2605
2606 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2607 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2608 if (error)
2609 return (error);
2610 }
2611
2612 return (0);
2613 }
2614
2615 /*
2616 * Set a particular packet option, as a sticky option or an ancillary data
2617 * item. "len" can be 0 only when it's a sticky option.
2618 * We have 4 cases of combination of "sticky" and "cmsg":
2619 * "sticky=0, cmsg=0": impossible
2620 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2621 * "sticky=1, cmsg=0": RFC3542 socket option
2622 * "sticky=1, cmsg=1": RFC2292 socket option
2623 */
2624 static int
2625 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2626 struct ucred *cred, int sticky, int cmsg, int uproto)
2627 {
2628 int minmtupolicy, preftemp;
2629 int error;
2630
2631 if (!sticky && !cmsg) {
2632 #ifdef DIAGNOSTIC
2633 printf("ip6_setpktopt: impossible case\n");
2634 #endif
2635 return (EINVAL);
2636 }
2637
2638 /*
2639 * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2640 * not be specified in the context of RFC3542. Conversely,
2641 * RFC3542 types should not be specified in the context of RFC2292.
2642 */
2643 if (!cmsg) {
2644 switch (optname) {
2645 case IPV6_2292PKTINFO:
2646 case IPV6_2292HOPLIMIT:
2647 case IPV6_2292NEXTHOP:
2648 case IPV6_2292HOPOPTS:
2649 case IPV6_2292DSTOPTS:
2650 case IPV6_2292RTHDR:
2651 case IPV6_2292PKTOPTIONS:
2652 return (ENOPROTOOPT);
2653 }
2654 }
2655 if (sticky && cmsg) {
2656 switch (optname) {
2657 case IPV6_PKTINFO:
2658 case IPV6_HOPLIMIT:
2659 case IPV6_NEXTHOP:
2660 case IPV6_HOPOPTS:
2661 case IPV6_DSTOPTS:
2662 case IPV6_RTHDRDSTOPTS:
2663 case IPV6_RTHDR:
2664 case IPV6_USE_MIN_MTU:
2665 case IPV6_DONTFRAG:
2666 case IPV6_TCLASS:
2667 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2668 return (ENOPROTOOPT);
2669 }
2670 }
2671
2672 switch (optname) {
2673 case IPV6_2292PKTINFO:
2674 case IPV6_PKTINFO:
2675 {
2676 struct ifnet *ifp = NULL;
2677 struct in6_pktinfo *pktinfo;
2678
2679 if (len != sizeof(struct in6_pktinfo))
2680 return (EINVAL);
2681
2682 pktinfo = (struct in6_pktinfo *)buf;
2683
2684 /*
2685 * An application can clear any sticky IPV6_PKTINFO option by
2686 * doing a "regular" setsockopt with ipi6_addr being
2687 * in6addr_any and ipi6_ifindex being zero.
2688 * [RFC 3542, Section 6]
2689 */
2690 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2691 pktinfo->ipi6_ifindex == 0 &&
2692 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2693 ip6_clearpktopts(opt, optname);
2694 break;
2695 }
2696
2697 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2698 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2699 return (EINVAL);
2700 }
2701 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr))
2702 return (EINVAL);
2703 /* validate the interface index if specified. */
2704 if (pktinfo->ipi6_ifindex > V_if_index)
2705 return (ENXIO);
2706 if (pktinfo->ipi6_ifindex) {
2707 ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2708 if (ifp == NULL)
2709 return (ENXIO);
2710 }
2711 if (ifp != NULL && (ifp->if_afdata[AF_INET6] == NULL ||
2712 (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) != 0))
2713 return (ENETDOWN);
2714
2715 if (ifp != NULL &&
2716 !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2717 struct in6_ifaddr *ia;
2718
2719 in6_setscope(&pktinfo->ipi6_addr, ifp, NULL);
2720 ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr);
2721 if (ia == NULL)
2722 return (EADDRNOTAVAIL);
2723 ifa_free(&ia->ia_ifa);
2724 }
2725 /*
2726 * We store the address anyway, and let in6_selectsrc()
2727 * validate the specified address. This is because ipi6_addr
2728 * may not have enough information about its scope zone, and
2729 * we may need additional information (such as outgoing
2730 * interface or the scope zone of a destination address) to
2731 * disambiguate the scope.
2732 * XXX: the delay of the validation may confuse the
2733 * application when it is used as a sticky option.
2734 */
2735 if (opt->ip6po_pktinfo == NULL) {
2736 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2737 M_IP6OPT, M_NOWAIT);
2738 if (opt->ip6po_pktinfo == NULL)
2739 return (ENOBUFS);
2740 }
2741 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2742 break;
2743 }
2744
2745 case IPV6_2292HOPLIMIT:
2746 case IPV6_HOPLIMIT:
2747 {
2748 int *hlimp;
2749
2750 /*
2751 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2752 * to simplify the ordering among hoplimit options.
2753 */
2754 if (optname == IPV6_HOPLIMIT && sticky)
2755 return (ENOPROTOOPT);
2756
2757 if (len != sizeof(int))
2758 return (EINVAL);
2759 hlimp = (int *)buf;
2760 if (*hlimp < -1 || *hlimp > 255)
2761 return (EINVAL);
2762
2763 opt->ip6po_hlim = *hlimp;
2764 break;
2765 }
2766
2767 case IPV6_TCLASS:
2768 {
2769 int tclass;
2770
2771 if (len != sizeof(int))
2772 return (EINVAL);
2773 tclass = *(int *)buf;
2774 if (tclass < -1 || tclass > 255)
2775 return (EINVAL);
2776
2777 opt->ip6po_tclass = tclass;
2778 break;
2779 }
2780
2781 case IPV6_2292NEXTHOP:
2782 case IPV6_NEXTHOP:
2783 if (cred != NULL) {
2784 error = priv_check_cred(cred,
2785 PRIV_NETINET_SETHDROPTS, 0);
2786 if (error)
2787 return (error);
2788 }
2789
2790 if (len == 0) { /* just remove the option */
2791 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2792 break;
2793 }
2794
2795 /* check if cmsg_len is large enough for sa_len */
2796 if (len < sizeof(struct sockaddr) || len < *buf)
2797 return (EINVAL);
2798
2799 switch (((struct sockaddr *)buf)->sa_family) {
2800 case AF_INET6:
2801 {
2802 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
2803 int error;
2804
2805 if (sa6->sin6_len != sizeof(struct sockaddr_in6))
2806 return (EINVAL);
2807
2808 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
2809 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
2810 return (EINVAL);
2811 }
2812 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
2813 != 0) {
2814 return (error);
2815 }
2816 break;
2817 }
2818 case AF_LINK: /* should eventually be supported */
2819 default:
2820 return (EAFNOSUPPORT);
2821 }
2822
2823 /* turn off the previous option, then set the new option. */
2824 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2825 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
2826 if (opt->ip6po_nexthop == NULL)
2827 return (ENOBUFS);
2828 bcopy(buf, opt->ip6po_nexthop, *buf);
2829 break;
2830
2831 case IPV6_2292HOPOPTS:
2832 case IPV6_HOPOPTS:
2833 {
2834 struct ip6_hbh *hbh;
2835 int hbhlen;
2836
2837 /*
2838 * XXX: We don't allow a non-privileged user to set ANY HbH
2839 * options, since per-option restriction has too much
2840 * overhead.
2841 */
2842 if (cred != NULL) {
2843 error = priv_check_cred(cred,
2844 PRIV_NETINET_SETHDROPTS, 0);
2845 if (error)
2846 return (error);
2847 }
2848
2849 if (len == 0) {
2850 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2851 break; /* just remove the option */
2852 }
2853
2854 /* message length validation */
2855 if (len < sizeof(struct ip6_hbh))
2856 return (EINVAL);
2857 hbh = (struct ip6_hbh *)buf;
2858 hbhlen = (hbh->ip6h_len + 1) << 3;
2859 if (len != hbhlen)
2860 return (EINVAL);
2861
2862 /* turn off the previous option, then set the new option. */
2863 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2864 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
2865 if (opt->ip6po_hbh == NULL)
2866 return (ENOBUFS);
2867 bcopy(hbh, opt->ip6po_hbh, hbhlen);
2868
2869 break;
2870 }
2871
2872 case IPV6_2292DSTOPTS:
2873 case IPV6_DSTOPTS:
2874 case IPV6_RTHDRDSTOPTS:
2875 {
2876 struct ip6_dest *dest, **newdest = NULL;
2877 int destlen;
2878
2879 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
2880 error = priv_check_cred(cred,
2881 PRIV_NETINET_SETHDROPTS, 0);
2882 if (error)
2883 return (error);
2884 }
2885
2886 if (len == 0) {
2887 ip6_clearpktopts(opt, optname);
2888 break; /* just remove the option */
2889 }
2890
2891 /* message length validation */
2892 if (len < sizeof(struct ip6_dest))
2893 return (EINVAL);
2894 dest = (struct ip6_dest *)buf;
2895 destlen = (dest->ip6d_len + 1) << 3;
2896 if (len != destlen)
2897 return (EINVAL);
2898
2899 /*
2900 * Determine the position that the destination options header
2901 * should be inserted; before or after the routing header.
2902 */
2903 switch (optname) {
2904 case IPV6_2292DSTOPTS:
2905 /*
2906 * The old advacned API is ambiguous on this point.
2907 * Our approach is to determine the position based
2908 * according to the existence of a routing header.
2909 * Note, however, that this depends on the order of the
2910 * extension headers in the ancillary data; the 1st
2911 * part of the destination options header must appear
2912 * before the routing header in the ancillary data,
2913 * too.
2914 * RFC3542 solved the ambiguity by introducing
2915 * separate ancillary data or option types.
2916 */
2917 if (opt->ip6po_rthdr == NULL)
2918 newdest = &opt->ip6po_dest1;
2919 else
2920 newdest = &opt->ip6po_dest2;
2921 break;
2922 case IPV6_RTHDRDSTOPTS:
2923 newdest = &opt->ip6po_dest1;
2924 break;
2925 case IPV6_DSTOPTS:
2926 newdest = &opt->ip6po_dest2;
2927 break;
2928 }
2929
2930 /* turn off the previous option, then set the new option. */
2931 ip6_clearpktopts(opt, optname);
2932 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
2933 if (*newdest == NULL)
2934 return (ENOBUFS);
2935 bcopy(dest, *newdest, destlen);
2936
2937 break;
2938 }
2939
2940 case IPV6_2292RTHDR:
2941 case IPV6_RTHDR:
2942 {
2943 struct ip6_rthdr *rth;
2944 int rthlen;
2945
2946 if (len == 0) {
2947 ip6_clearpktopts(opt, IPV6_RTHDR);
2948 break; /* just remove the option */
2949 }
2950
2951 /* message length validation */
2952 if (len < sizeof(struct ip6_rthdr))
2953 return (EINVAL);
2954 rth = (struct ip6_rthdr *)buf;
2955 rthlen = (rth->ip6r_len + 1) << 3;
2956 if (len != rthlen)
2957 return (EINVAL);
2958
2959 switch (rth->ip6r_type) {
2960 case IPV6_RTHDR_TYPE_0:
2961 if (rth->ip6r_len == 0) /* must contain one addr */
2962 return (EINVAL);
2963 if (rth->ip6r_len % 2) /* length must be even */
2964 return (EINVAL);
2965 if (rth->ip6r_len / 2 != rth->ip6r_segleft)
2966 return (EINVAL);
2967 break;
2968 default:
2969 return (EINVAL); /* not supported */
2970 }
2971
2972 /* turn off the previous option */
2973 ip6_clearpktopts(opt, IPV6_RTHDR);
2974 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
2975 if (opt->ip6po_rthdr == NULL)
2976 return (ENOBUFS);
2977 bcopy(rth, opt->ip6po_rthdr, rthlen);
2978
2979 break;
2980 }
2981
2982 case IPV6_USE_MIN_MTU:
2983 if (len != sizeof(int))
2984 return (EINVAL);
2985 minmtupolicy = *(int *)buf;
2986 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
2987 minmtupolicy != IP6PO_MINMTU_DISABLE &&
2988 minmtupolicy != IP6PO_MINMTU_ALL) {
2989 return (EINVAL);
2990 }
2991 opt->ip6po_minmtu = minmtupolicy;
2992 break;
2993
2994 case IPV6_DONTFRAG:
2995 if (len != sizeof(int))
2996 return (EINVAL);
2997
2998 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
2999 /*
3000 * we ignore this option for TCP sockets.
3001 * (RFC3542 leaves this case unspecified.)
3002 */
3003 opt->ip6po_flags &= ~IP6PO_DONTFRAG;
3004 } else
3005 opt->ip6po_flags |= IP6PO_DONTFRAG;
3006 break;
3007
3008 case IPV6_PREFER_TEMPADDR:
3009 if (len != sizeof(int))
3010 return (EINVAL);
3011 preftemp = *(int *)buf;
3012 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
3013 preftemp != IP6PO_TEMPADDR_NOTPREFER &&
3014 preftemp != IP6PO_TEMPADDR_PREFER) {
3015 return (EINVAL);
3016 }
3017 opt->ip6po_prefer_tempaddr = preftemp;
3018 break;
3019
3020 default:
3021 return (ENOPROTOOPT);
3022 } /* end of switch */
3023
3024 return (0);
3025 }
3026
3027 /*
3028 * Routine called from ip6_output() to loop back a copy of an IP6 multicast
3029 * packet to the input queue of a specified interface. Note that this
3030 * calls the output routine of the loopback "driver", but with an interface
3031 * pointer that might NOT be &loif -- easier than replicating that code here.
3032 */
3033 void
3034 ip6_mloopback(struct ifnet *ifp, struct mbuf *m)
3035 {
3036 struct mbuf *copym;
3037 struct ip6_hdr *ip6;
3038
3039 copym = m_copym(m, 0, M_COPYALL, M_NOWAIT);
3040 if (copym == NULL)
3041 return;
3042
3043 /*
3044 * Make sure to deep-copy IPv6 header portion in case the data
3045 * is in an mbuf cluster, so that we can safely override the IPv6
3046 * header portion later.
3047 */
3048 if (!M_WRITABLE(copym) ||
3049 copym->m_len < sizeof(struct ip6_hdr)) {
3050 copym = m_pullup(copym, sizeof(struct ip6_hdr));
3051 if (copym == NULL)
3052 return;
3053 }
3054 ip6 = mtod(copym, struct ip6_hdr *);
3055 /*
3056 * clear embedded scope identifiers if necessary.
3057 * in6_clearscope will touch the addresses only when necessary.
3058 */
3059 in6_clearscope(&ip6->ip6_src);
3060 in6_clearscope(&ip6->ip6_dst);
3061 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
3062 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 |
3063 CSUM_PSEUDO_HDR;
3064 copym->m_pkthdr.csum_data = 0xffff;
3065 }
3066 if_simloop(ifp, copym, AF_INET6, 0);
3067 }
3068
3069 /*
3070 * Chop IPv6 header off from the payload.
3071 */
3072 static int
3073 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
3074 {
3075 struct mbuf *mh;
3076 struct ip6_hdr *ip6;
3077
3078 ip6 = mtod(m, struct ip6_hdr *);
3079 if (m->m_len > sizeof(*ip6)) {
3080 mh = m_gethdr(M_NOWAIT, MT_DATA);
3081 if (mh == NULL) {
3082 m_freem(m);
3083 return ENOBUFS;
3084 }
3085 m_move_pkthdr(mh, m);
3086 M_ALIGN(mh, sizeof(*ip6));
3087 m->m_len -= sizeof(*ip6);
3088 m->m_data += sizeof(*ip6);
3089 mh->m_next = m;
3090 m = mh;
3091 m->m_len = sizeof(*ip6);
3092 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
3093 }
3094 exthdrs->ip6e_ip6 = m;
3095 return 0;
3096 }
3097
3098 /*
3099 * Compute IPv6 extension header length.
3100 */
3101 int
3102 ip6_optlen(struct inpcb *in6p)
3103 {
3104 int len;
3105
3106 if (!in6p->in6p_outputopts)
3107 return 0;
3108
3109 len = 0;
3110 #define elen(x) \
3111 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
3112
3113 len += elen(in6p->in6p_outputopts->ip6po_hbh);
3114 if (in6p->in6p_outputopts->ip6po_rthdr)
3115 /* dest1 is valid with rthdr only */
3116 len += elen(in6p->in6p_outputopts->ip6po_dest1);
3117 len += elen(in6p->in6p_outputopts->ip6po_rthdr);
3118 len += elen(in6p->in6p_outputopts->ip6po_dest2);
3119 return len;
3120 #undef elen
3121 }
Cache object: 7277ff1c66db0b8b8c04680abffd4da5
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