Loading...
1/*
2 * IPv6 BSD socket options interface
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/net/ipv4/ip_sockglue.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * FIXME: Make the setsockopt code POSIX compliant: That is
16 *
17 * o Truncate getsockopt returns
18 * o Return an optlen of the truncated length if need be
19 *
20 * Changes:
21 * David L Stevens <dlstevens@us.ibm.com>:
22 * - added multicast source filtering API for MLDv2
23 */
24
25#include <linux/module.h>
26#include <linux/capability.h>
27#include <linux/errno.h>
28#include <linux/types.h>
29#include <linux/socket.h>
30#include <linux/sockios.h>
31#include <linux/net.h>
32#include <linux/in6.h>
33#include <linux/mroute6.h>
34#include <linux/netdevice.h>
35#include <linux/if_arp.h>
36#include <linux/init.h>
37#include <linux/sysctl.h>
38#include <linux/netfilter.h>
39#include <linux/slab.h>
40
41#include <net/sock.h>
42#include <net/snmp.h>
43#include <net/ipv6.h>
44#include <net/ndisc.h>
45#include <net/protocol.h>
46#include <net/transp_v6.h>
47#include <net/ip6_route.h>
48#include <net/addrconf.h>
49#include <net/inet_common.h>
50#include <net/tcp.h>
51#include <net/udp.h>
52#include <net/udplite.h>
53#include <net/xfrm.h>
54#include <net/compat.h>
55
56#include <asm/uaccess.h>
57
58struct ip6_ra_chain *ip6_ra_chain;
59DEFINE_RWLOCK(ip6_ra_lock);
60
61int ip6_ra_control(struct sock *sk, int sel)
62{
63 struct ip6_ra_chain *ra, *new_ra, **rap;
64
65 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
66 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
67 return -ENOPROTOOPT;
68
69 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
70
71 write_lock_bh(&ip6_ra_lock);
72 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
73 if (ra->sk == sk) {
74 if (sel>=0) {
75 write_unlock_bh(&ip6_ra_lock);
76 kfree(new_ra);
77 return -EADDRINUSE;
78 }
79
80 *rap = ra->next;
81 write_unlock_bh(&ip6_ra_lock);
82
83 sock_put(sk);
84 kfree(ra);
85 return 0;
86 }
87 }
88 if (new_ra == NULL) {
89 write_unlock_bh(&ip6_ra_lock);
90 return -ENOBUFS;
91 }
92 new_ra->sk = sk;
93 new_ra->sel = sel;
94 new_ra->next = ra;
95 *rap = new_ra;
96 sock_hold(sk);
97 write_unlock_bh(&ip6_ra_lock);
98 return 0;
99}
100
101static
102struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
103 struct ipv6_txoptions *opt)
104{
105 if (inet_sk(sk)->is_icsk) {
106 if (opt &&
107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
109 struct inet_connection_sock *icsk = inet_csk(sk);
110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
112 }
113 opt = xchg(&inet6_sk(sk)->opt, opt);
114 } else {
115 spin_lock(&sk->sk_dst_lock);
116 opt = xchg(&inet6_sk(sk)->opt, opt);
117 spin_unlock(&sk->sk_dst_lock);
118 }
119 sk_dst_reset(sk);
120
121 return opt;
122}
123
124static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
125 char __user *optval, unsigned int optlen)
126{
127 struct ipv6_pinfo *np = inet6_sk(sk);
128 struct net *net = sock_net(sk);
129 int val, valbool;
130 int retv = -ENOPROTOOPT;
131
132 if (optval == NULL)
133 val=0;
134 else {
135 if (optlen >= sizeof(int)) {
136 if (get_user(val, (int __user *) optval))
137 return -EFAULT;
138 } else
139 val = 0;
140 }
141
142 valbool = (val!=0);
143
144 if (ip6_mroute_opt(optname))
145 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
146
147 lock_sock(sk);
148
149 switch (optname) {
150
151 case IPV6_ADDRFORM:
152 if (optlen < sizeof(int))
153 goto e_inval;
154 if (val == PF_INET) {
155 struct ipv6_txoptions *opt;
156 struct sk_buff *pktopt;
157
158 if (sk->sk_type == SOCK_RAW)
159 break;
160
161 if (sk->sk_protocol == IPPROTO_UDP ||
162 sk->sk_protocol == IPPROTO_UDPLITE) {
163 struct udp_sock *up = udp_sk(sk);
164 if (up->pending == AF_INET6) {
165 retv = -EBUSY;
166 break;
167 }
168 } else if (sk->sk_protocol != IPPROTO_TCP)
169 break;
170
171 if (sk->sk_state != TCP_ESTABLISHED) {
172 retv = -ENOTCONN;
173 break;
174 }
175
176 if (ipv6_only_sock(sk) ||
177 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
178 retv = -EADDRNOTAVAIL;
179 break;
180 }
181
182 fl6_free_socklist(sk);
183 ipv6_sock_mc_close(sk);
184
185 /*
186 * Sock is moving from IPv6 to IPv4 (sk_prot), so
187 * remove it from the refcnt debug socks count in the
188 * original family...
189 */
190 sk_refcnt_debug_dec(sk);
191
192 if (sk->sk_protocol == IPPROTO_TCP) {
193 struct inet_connection_sock *icsk = inet_csk(sk);
194 local_bh_disable();
195 sock_prot_inuse_add(net, sk->sk_prot, -1);
196 sock_prot_inuse_add(net, &tcp_prot, 1);
197 local_bh_enable();
198 sk->sk_prot = &tcp_prot;
199 icsk->icsk_af_ops = &ipv4_specific;
200 sk->sk_socket->ops = &inet_stream_ops;
201 sk->sk_family = PF_INET;
202 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
203 } else {
204 struct proto *prot = &udp_prot;
205
206 if (sk->sk_protocol == IPPROTO_UDPLITE)
207 prot = &udplite_prot;
208 local_bh_disable();
209 sock_prot_inuse_add(net, sk->sk_prot, -1);
210 sock_prot_inuse_add(net, prot, 1);
211 local_bh_enable();
212 sk->sk_prot = prot;
213 sk->sk_socket->ops = &inet_dgram_ops;
214 sk->sk_family = PF_INET;
215 }
216 opt = xchg(&np->opt, NULL);
217 if (opt)
218 sock_kfree_s(sk, opt, opt->tot_len);
219 pktopt = xchg(&np->pktoptions, NULL);
220 kfree_skb(pktopt);
221
222 sk->sk_destruct = inet_sock_destruct;
223 /*
224 * ... and add it to the refcnt debug socks count
225 * in the new family. -acme
226 */
227 sk_refcnt_debug_inc(sk);
228 module_put(THIS_MODULE);
229 retv = 0;
230 break;
231 }
232 goto e_inval;
233
234 case IPV6_V6ONLY:
235 if (optlen < sizeof(int) ||
236 inet_sk(sk)->inet_num)
237 goto e_inval;
238 np->ipv6only = valbool;
239 retv = 0;
240 break;
241
242 case IPV6_RECVPKTINFO:
243 if (optlen < sizeof(int))
244 goto e_inval;
245 np->rxopt.bits.rxinfo = valbool;
246 retv = 0;
247 break;
248
249 case IPV6_2292PKTINFO:
250 if (optlen < sizeof(int))
251 goto e_inval;
252 np->rxopt.bits.rxoinfo = valbool;
253 retv = 0;
254 break;
255
256 case IPV6_RECVHOPLIMIT:
257 if (optlen < sizeof(int))
258 goto e_inval;
259 np->rxopt.bits.rxhlim = valbool;
260 retv = 0;
261 break;
262
263 case IPV6_2292HOPLIMIT:
264 if (optlen < sizeof(int))
265 goto e_inval;
266 np->rxopt.bits.rxohlim = valbool;
267 retv = 0;
268 break;
269
270 case IPV6_RECVRTHDR:
271 if (optlen < sizeof(int))
272 goto e_inval;
273 np->rxopt.bits.srcrt = valbool;
274 retv = 0;
275 break;
276
277 case IPV6_2292RTHDR:
278 if (optlen < sizeof(int))
279 goto e_inval;
280 np->rxopt.bits.osrcrt = valbool;
281 retv = 0;
282 break;
283
284 case IPV6_RECVHOPOPTS:
285 if (optlen < sizeof(int))
286 goto e_inval;
287 np->rxopt.bits.hopopts = valbool;
288 retv = 0;
289 break;
290
291 case IPV6_2292HOPOPTS:
292 if (optlen < sizeof(int))
293 goto e_inval;
294 np->rxopt.bits.ohopopts = valbool;
295 retv = 0;
296 break;
297
298 case IPV6_RECVDSTOPTS:
299 if (optlen < sizeof(int))
300 goto e_inval;
301 np->rxopt.bits.dstopts = valbool;
302 retv = 0;
303 break;
304
305 case IPV6_2292DSTOPTS:
306 if (optlen < sizeof(int))
307 goto e_inval;
308 np->rxopt.bits.odstopts = valbool;
309 retv = 0;
310 break;
311
312 case IPV6_TCLASS:
313 if (optlen < sizeof(int))
314 goto e_inval;
315 if (val < -1 || val > 0xff)
316 goto e_inval;
317 /* RFC 3542, 6.5: default traffic class of 0x0 */
318 if (val == -1)
319 val = 0;
320 np->tclass = val;
321 retv = 0;
322 break;
323
324 case IPV6_RECVTCLASS:
325 if (optlen < sizeof(int))
326 goto e_inval;
327 np->rxopt.bits.rxtclass = valbool;
328 retv = 0;
329 break;
330
331 case IPV6_FLOWINFO:
332 if (optlen < sizeof(int))
333 goto e_inval;
334 np->rxopt.bits.rxflow = valbool;
335 retv = 0;
336 break;
337
338 case IPV6_RECVPATHMTU:
339 if (optlen < sizeof(int))
340 goto e_inval;
341 np->rxopt.bits.rxpmtu = valbool;
342 retv = 0;
343 break;
344
345 case IPV6_TRANSPARENT:
346 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
347 !ns_capable(net->user_ns, CAP_NET_RAW)) {
348 retv = -EPERM;
349 break;
350 }
351 if (optlen < sizeof(int))
352 goto e_inval;
353 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
354 inet_sk(sk)->transparent = valbool;
355 retv = 0;
356 break;
357
358 case IPV6_RECVORIGDSTADDR:
359 if (optlen < sizeof(int))
360 goto e_inval;
361 np->rxopt.bits.rxorigdstaddr = valbool;
362 retv = 0;
363 break;
364
365 case IPV6_HOPOPTS:
366 case IPV6_RTHDRDSTOPTS:
367 case IPV6_RTHDR:
368 case IPV6_DSTOPTS:
369 {
370 struct ipv6_txoptions *opt;
371
372 /* remove any sticky options header with a zero option
373 * length, per RFC3542.
374 */
375 if (optlen == 0)
376 optval = NULL;
377 else if (optval == NULL)
378 goto e_inval;
379 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
380 optlen & 0x7 || optlen > 8 * 255)
381 goto e_inval;
382
383 /* hop-by-hop / destination options are privileged option */
384 retv = -EPERM;
385 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
386 break;
387
388 opt = ipv6_renew_options(sk, np->opt, optname,
389 (struct ipv6_opt_hdr __user *)optval,
390 optlen);
391 if (IS_ERR(opt)) {
392 retv = PTR_ERR(opt);
393 break;
394 }
395
396 /* routing header option needs extra check */
397 retv = -EINVAL;
398 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
399 struct ipv6_rt_hdr *rthdr = opt->srcrt;
400 switch (rthdr->type) {
401#if IS_ENABLED(CONFIG_IPV6_MIP6)
402 case IPV6_SRCRT_TYPE_2:
403 if (rthdr->hdrlen != 2 ||
404 rthdr->segments_left != 1)
405 goto sticky_done;
406
407 break;
408#endif
409 default:
410 goto sticky_done;
411 }
412 }
413
414 retv = 0;
415 opt = ipv6_update_options(sk, opt);
416sticky_done:
417 if (opt)
418 sock_kfree_s(sk, opt, opt->tot_len);
419 break;
420 }
421
422 case IPV6_PKTINFO:
423 {
424 struct in6_pktinfo pkt;
425
426 if (optlen == 0)
427 goto e_inval;
428 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
429 goto e_inval;
430
431 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
432 retv = -EFAULT;
433 break;
434 }
435 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
436 goto e_inval;
437
438 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
439 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
440 retv = 0;
441 break;
442 }
443
444 case IPV6_2292PKTOPTIONS:
445 {
446 struct ipv6_txoptions *opt = NULL;
447 struct msghdr msg;
448 struct flowi6 fl6;
449 int junk;
450
451 memset(&fl6, 0, sizeof(fl6));
452 fl6.flowi6_oif = sk->sk_bound_dev_if;
453 fl6.flowi6_mark = sk->sk_mark;
454
455 if (optlen == 0)
456 goto update;
457
458 /* 1K is probably excessive
459 * 1K is surely not enough, 2K per standard header is 16K.
460 */
461 retv = -EINVAL;
462 if (optlen > 64*1024)
463 break;
464
465 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
466 retv = -ENOBUFS;
467 if (opt == NULL)
468 break;
469
470 memset(opt, 0, sizeof(*opt));
471 opt->tot_len = sizeof(*opt) + optlen;
472 retv = -EFAULT;
473 if (copy_from_user(opt+1, optval, optlen))
474 goto done;
475
476 msg.msg_controllen = optlen;
477 msg.msg_control = (void*)(opt+1);
478
479 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk,
480 &junk, &junk);
481 if (retv)
482 goto done;
483update:
484 retv = 0;
485 opt = ipv6_update_options(sk, opt);
486done:
487 if (opt)
488 sock_kfree_s(sk, opt, opt->tot_len);
489 break;
490 }
491 case IPV6_UNICAST_HOPS:
492 if (optlen < sizeof(int))
493 goto e_inval;
494 if (val > 255 || val < -1)
495 goto e_inval;
496 np->hop_limit = val;
497 retv = 0;
498 break;
499
500 case IPV6_MULTICAST_HOPS:
501 if (sk->sk_type == SOCK_STREAM)
502 break;
503 if (optlen < sizeof(int))
504 goto e_inval;
505 if (val > 255 || val < -1)
506 goto e_inval;
507 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
508 retv = 0;
509 break;
510
511 case IPV6_MULTICAST_LOOP:
512 if (optlen < sizeof(int))
513 goto e_inval;
514 if (val != valbool)
515 goto e_inval;
516 np->mc_loop = valbool;
517 retv = 0;
518 break;
519
520 case IPV6_UNICAST_IF:
521 {
522 struct net_device *dev = NULL;
523 int ifindex;
524
525 if (optlen != sizeof(int))
526 goto e_inval;
527
528 ifindex = (__force int)ntohl((__force __be32)val);
529 if (ifindex == 0) {
530 np->ucast_oif = 0;
531 retv = 0;
532 break;
533 }
534
535 dev = dev_get_by_index(net, ifindex);
536 retv = -EADDRNOTAVAIL;
537 if (!dev)
538 break;
539 dev_put(dev);
540
541 retv = -EINVAL;
542 if (sk->sk_bound_dev_if)
543 break;
544
545 np->ucast_oif = ifindex;
546 retv = 0;
547 break;
548 }
549
550 case IPV6_MULTICAST_IF:
551 if (sk->sk_type == SOCK_STREAM)
552 break;
553 if (optlen < sizeof(int))
554 goto e_inval;
555
556 if (val) {
557 struct net_device *dev;
558
559 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
560 goto e_inval;
561
562 dev = dev_get_by_index(net, val);
563 if (!dev) {
564 retv = -ENODEV;
565 break;
566 }
567 dev_put(dev);
568 }
569 np->mcast_oif = val;
570 retv = 0;
571 break;
572 case IPV6_ADD_MEMBERSHIP:
573 case IPV6_DROP_MEMBERSHIP:
574 {
575 struct ipv6_mreq mreq;
576
577 if (optlen < sizeof(struct ipv6_mreq))
578 goto e_inval;
579
580 retv = -EPROTO;
581 if (inet_sk(sk)->is_icsk)
582 break;
583
584 retv = -EFAULT;
585 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
586 break;
587
588 if (optname == IPV6_ADD_MEMBERSHIP)
589 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
590 else
591 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
592 break;
593 }
594 case IPV6_JOIN_ANYCAST:
595 case IPV6_LEAVE_ANYCAST:
596 {
597 struct ipv6_mreq mreq;
598
599 if (optlen < sizeof(struct ipv6_mreq))
600 goto e_inval;
601
602 retv = -EFAULT;
603 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
604 break;
605
606 if (optname == IPV6_JOIN_ANYCAST)
607 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
608 else
609 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
610 break;
611 }
612 case MCAST_JOIN_GROUP:
613 case MCAST_LEAVE_GROUP:
614 {
615 struct group_req greq;
616 struct sockaddr_in6 *psin6;
617
618 if (optlen < sizeof(struct group_req))
619 goto e_inval;
620
621 retv = -EFAULT;
622 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
623 break;
624 if (greq.gr_group.ss_family != AF_INET6) {
625 retv = -EADDRNOTAVAIL;
626 break;
627 }
628 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
629 if (optname == MCAST_JOIN_GROUP)
630 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
631 &psin6->sin6_addr);
632 else
633 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
634 &psin6->sin6_addr);
635 break;
636 }
637 case MCAST_JOIN_SOURCE_GROUP:
638 case MCAST_LEAVE_SOURCE_GROUP:
639 case MCAST_BLOCK_SOURCE:
640 case MCAST_UNBLOCK_SOURCE:
641 {
642 struct group_source_req greqs;
643 int omode, add;
644
645 if (optlen < sizeof(struct group_source_req))
646 goto e_inval;
647 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
648 retv = -EFAULT;
649 break;
650 }
651 if (greqs.gsr_group.ss_family != AF_INET6 ||
652 greqs.gsr_source.ss_family != AF_INET6) {
653 retv = -EADDRNOTAVAIL;
654 break;
655 }
656 if (optname == MCAST_BLOCK_SOURCE) {
657 omode = MCAST_EXCLUDE;
658 add = 1;
659 } else if (optname == MCAST_UNBLOCK_SOURCE) {
660 omode = MCAST_EXCLUDE;
661 add = 0;
662 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
663 struct sockaddr_in6 *psin6;
664
665 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
666 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
667 &psin6->sin6_addr);
668 /* prior join w/ different source is ok */
669 if (retv && retv != -EADDRINUSE)
670 break;
671 omode = MCAST_INCLUDE;
672 add = 1;
673 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
674 omode = MCAST_INCLUDE;
675 add = 0;
676 }
677 retv = ip6_mc_source(add, omode, sk, &greqs);
678 break;
679 }
680 case MCAST_MSFILTER:
681 {
682 struct group_filter *gsf;
683
684 if (optlen < GROUP_FILTER_SIZE(0))
685 goto e_inval;
686 if (optlen > sysctl_optmem_max) {
687 retv = -ENOBUFS;
688 break;
689 }
690 gsf = kmalloc(optlen,GFP_KERNEL);
691 if (!gsf) {
692 retv = -ENOBUFS;
693 break;
694 }
695 retv = -EFAULT;
696 if (copy_from_user(gsf, optval, optlen)) {
697 kfree(gsf);
698 break;
699 }
700 /* numsrc >= (4G-140)/128 overflow in 32 bits */
701 if (gsf->gf_numsrc >= 0x1ffffffU ||
702 gsf->gf_numsrc > sysctl_mld_max_msf) {
703 kfree(gsf);
704 retv = -ENOBUFS;
705 break;
706 }
707 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
708 kfree(gsf);
709 retv = -EINVAL;
710 break;
711 }
712 retv = ip6_mc_msfilter(sk, gsf);
713 kfree(gsf);
714
715 break;
716 }
717 case IPV6_ROUTER_ALERT:
718 if (optlen < sizeof(int))
719 goto e_inval;
720 retv = ip6_ra_control(sk, val);
721 break;
722 case IPV6_MTU_DISCOVER:
723 if (optlen < sizeof(int))
724 goto e_inval;
725 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
726 goto e_inval;
727 np->pmtudisc = val;
728 retv = 0;
729 break;
730 case IPV6_MTU:
731 if (optlen < sizeof(int))
732 goto e_inval;
733 if (val && val < IPV6_MIN_MTU)
734 goto e_inval;
735 np->frag_size = val;
736 retv = 0;
737 break;
738 case IPV6_RECVERR:
739 if (optlen < sizeof(int))
740 goto e_inval;
741 np->recverr = valbool;
742 if (!val)
743 skb_queue_purge(&sk->sk_error_queue);
744 retv = 0;
745 break;
746 case IPV6_FLOWINFO_SEND:
747 if (optlen < sizeof(int))
748 goto e_inval;
749 np->sndflow = valbool;
750 retv = 0;
751 break;
752 case IPV6_FLOWLABEL_MGR:
753 retv = ipv6_flowlabel_opt(sk, optval, optlen);
754 break;
755 case IPV6_IPSEC_POLICY:
756 case IPV6_XFRM_POLICY:
757 retv = -EPERM;
758 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
759 break;
760 retv = xfrm_user_policy(sk, optname, optval, optlen);
761 break;
762
763 case IPV6_ADDR_PREFERENCES:
764 {
765 unsigned int pref = 0;
766 unsigned int prefmask = ~0;
767
768 if (optlen < sizeof(int))
769 goto e_inval;
770
771 retv = -EINVAL;
772
773 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
774 switch (val & (IPV6_PREFER_SRC_PUBLIC|
775 IPV6_PREFER_SRC_TMP|
776 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
777 case IPV6_PREFER_SRC_PUBLIC:
778 pref |= IPV6_PREFER_SRC_PUBLIC;
779 break;
780 case IPV6_PREFER_SRC_TMP:
781 pref |= IPV6_PREFER_SRC_TMP;
782 break;
783 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
784 break;
785 case 0:
786 goto pref_skip_pubtmp;
787 default:
788 goto e_inval;
789 }
790
791 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
792 IPV6_PREFER_SRC_TMP);
793pref_skip_pubtmp:
794
795 /* check HOME/COA conflicts */
796 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
797 case IPV6_PREFER_SRC_HOME:
798 break;
799 case IPV6_PREFER_SRC_COA:
800 pref |= IPV6_PREFER_SRC_COA;
801 case 0:
802 goto pref_skip_coa;
803 default:
804 goto e_inval;
805 }
806
807 prefmask &= ~IPV6_PREFER_SRC_COA;
808pref_skip_coa:
809
810 /* check CGA/NONCGA conflicts */
811 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
812 case IPV6_PREFER_SRC_CGA:
813 case IPV6_PREFER_SRC_NONCGA:
814 case 0:
815 break;
816 default:
817 goto e_inval;
818 }
819
820 np->srcprefs = (np->srcprefs & prefmask) | pref;
821 retv = 0;
822
823 break;
824 }
825 case IPV6_MINHOPCOUNT:
826 if (optlen < sizeof(int))
827 goto e_inval;
828 if (val < 0 || val > 255)
829 goto e_inval;
830 np->min_hopcount = val;
831 retv = 0;
832 break;
833 case IPV6_DONTFRAG:
834 np->dontfrag = valbool;
835 retv = 0;
836 break;
837 }
838
839 release_sock(sk);
840
841 return retv;
842
843e_inval:
844 release_sock(sk);
845 return -EINVAL;
846}
847
848int ipv6_setsockopt(struct sock *sk, int level, int optname,
849 char __user *optval, unsigned int optlen)
850{
851 int err;
852
853 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
854 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
855
856 if (level != SOL_IPV6)
857 return -ENOPROTOOPT;
858
859 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
860#ifdef CONFIG_NETFILTER
861 /* we need to exclude all possible ENOPROTOOPTs except default case */
862 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
863 optname != IPV6_XFRM_POLICY) {
864 lock_sock(sk);
865 err = nf_setsockopt(sk, PF_INET6, optname, optval,
866 optlen);
867 release_sock(sk);
868 }
869#endif
870 return err;
871}
872
873EXPORT_SYMBOL(ipv6_setsockopt);
874
875#ifdef CONFIG_COMPAT
876int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
877 char __user *optval, unsigned int optlen)
878{
879 int err;
880
881 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
882 if (udp_prot.compat_setsockopt != NULL)
883 return udp_prot.compat_setsockopt(sk, level, optname,
884 optval, optlen);
885 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
886 }
887
888 if (level != SOL_IPV6)
889 return -ENOPROTOOPT;
890
891 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
892 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
893 ipv6_setsockopt);
894
895 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
896#ifdef CONFIG_NETFILTER
897 /* we need to exclude all possible ENOPROTOOPTs except default case */
898 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
899 optname != IPV6_XFRM_POLICY) {
900 lock_sock(sk);
901 err = compat_nf_setsockopt(sk, PF_INET6, optname,
902 optval, optlen);
903 release_sock(sk);
904 }
905#endif
906 return err;
907}
908
909EXPORT_SYMBOL(compat_ipv6_setsockopt);
910#endif
911
912static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
913 int optname, char __user *optval, int len)
914{
915 struct ipv6_opt_hdr *hdr;
916
917 if (!opt)
918 return 0;
919
920 switch(optname) {
921 case IPV6_HOPOPTS:
922 hdr = opt->hopopt;
923 break;
924 case IPV6_RTHDRDSTOPTS:
925 hdr = opt->dst0opt;
926 break;
927 case IPV6_RTHDR:
928 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
929 break;
930 case IPV6_DSTOPTS:
931 hdr = opt->dst1opt;
932 break;
933 default:
934 return -EINVAL; /* should not happen */
935 }
936
937 if (!hdr)
938 return 0;
939
940 len = min_t(unsigned int, len, ipv6_optlen(hdr));
941 if (copy_to_user(optval, hdr, len))
942 return -EFAULT;
943 return len;
944}
945
946static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
947 char __user *optval, int __user *optlen, unsigned int flags)
948{
949 struct ipv6_pinfo *np = inet6_sk(sk);
950 int len;
951 int val;
952
953 if (ip6_mroute_opt(optname))
954 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
955
956 if (get_user(len, optlen))
957 return -EFAULT;
958 switch (optname) {
959 case IPV6_ADDRFORM:
960 if (sk->sk_protocol != IPPROTO_UDP &&
961 sk->sk_protocol != IPPROTO_UDPLITE &&
962 sk->sk_protocol != IPPROTO_TCP)
963 return -ENOPROTOOPT;
964 if (sk->sk_state != TCP_ESTABLISHED)
965 return -ENOTCONN;
966 val = sk->sk_family;
967 break;
968 case MCAST_MSFILTER:
969 {
970 struct group_filter gsf;
971 int err;
972
973 if (len < GROUP_FILTER_SIZE(0))
974 return -EINVAL;
975 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
976 return -EFAULT;
977 if (gsf.gf_group.ss_family != AF_INET6)
978 return -EADDRNOTAVAIL;
979 lock_sock(sk);
980 err = ip6_mc_msfget(sk, &gsf,
981 (struct group_filter __user *)optval, optlen);
982 release_sock(sk);
983 return err;
984 }
985
986 case IPV6_2292PKTOPTIONS:
987 {
988 struct msghdr msg;
989 struct sk_buff *skb;
990
991 if (sk->sk_type != SOCK_STREAM)
992 return -ENOPROTOOPT;
993
994 msg.msg_control = optval;
995 msg.msg_controllen = len;
996 msg.msg_flags = flags;
997
998 lock_sock(sk);
999 skb = np->pktoptions;
1000 if (skb)
1001 atomic_inc(&skb->users);
1002 release_sock(sk);
1003
1004 if (skb) {
1005 ip6_datagram_recv_ctl(sk, &msg, skb);
1006 kfree_skb(skb);
1007 } else {
1008 if (np->rxopt.bits.rxinfo) {
1009 struct in6_pktinfo src_info;
1010 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1011 np->sticky_pktinfo.ipi6_ifindex;
1012 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1013 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1014 }
1015 if (np->rxopt.bits.rxhlim) {
1016 int hlim = np->mcast_hops;
1017 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1018 }
1019 if (np->rxopt.bits.rxtclass) {
1020 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1021
1022 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1023 }
1024 if (np->rxopt.bits.rxoinfo) {
1025 struct in6_pktinfo src_info;
1026 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1027 np->sticky_pktinfo.ipi6_ifindex;
1028 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1029 np->sticky_pktinfo.ipi6_addr;
1030 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1031 }
1032 if (np->rxopt.bits.rxohlim) {
1033 int hlim = np->mcast_hops;
1034 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1035 }
1036 if (np->rxopt.bits.rxflow) {
1037 __be32 flowinfo = np->rcv_flowinfo;
1038
1039 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1040 }
1041 }
1042 len -= msg.msg_controllen;
1043 return put_user(len, optlen);
1044 }
1045 case IPV6_MTU:
1046 {
1047 struct dst_entry *dst;
1048
1049 val = 0;
1050 rcu_read_lock();
1051 dst = __sk_dst_get(sk);
1052 if (dst)
1053 val = dst_mtu(dst);
1054 rcu_read_unlock();
1055 if (!val)
1056 return -ENOTCONN;
1057 break;
1058 }
1059
1060 case IPV6_V6ONLY:
1061 val = np->ipv6only;
1062 break;
1063
1064 case IPV6_RECVPKTINFO:
1065 val = np->rxopt.bits.rxinfo;
1066 break;
1067
1068 case IPV6_2292PKTINFO:
1069 val = np->rxopt.bits.rxoinfo;
1070 break;
1071
1072 case IPV6_RECVHOPLIMIT:
1073 val = np->rxopt.bits.rxhlim;
1074 break;
1075
1076 case IPV6_2292HOPLIMIT:
1077 val = np->rxopt.bits.rxohlim;
1078 break;
1079
1080 case IPV6_RECVRTHDR:
1081 val = np->rxopt.bits.srcrt;
1082 break;
1083
1084 case IPV6_2292RTHDR:
1085 val = np->rxopt.bits.osrcrt;
1086 break;
1087
1088 case IPV6_HOPOPTS:
1089 case IPV6_RTHDRDSTOPTS:
1090 case IPV6_RTHDR:
1091 case IPV6_DSTOPTS:
1092 {
1093
1094 lock_sock(sk);
1095 len = ipv6_getsockopt_sticky(sk, np->opt,
1096 optname, optval, len);
1097 release_sock(sk);
1098 /* check if ipv6_getsockopt_sticky() returns err code */
1099 if (len < 0)
1100 return len;
1101 return put_user(len, optlen);
1102 }
1103
1104 case IPV6_RECVHOPOPTS:
1105 val = np->rxopt.bits.hopopts;
1106 break;
1107
1108 case IPV6_2292HOPOPTS:
1109 val = np->rxopt.bits.ohopopts;
1110 break;
1111
1112 case IPV6_RECVDSTOPTS:
1113 val = np->rxopt.bits.dstopts;
1114 break;
1115
1116 case IPV6_2292DSTOPTS:
1117 val = np->rxopt.bits.odstopts;
1118 break;
1119
1120 case IPV6_TCLASS:
1121 val = np->tclass;
1122 break;
1123
1124 case IPV6_RECVTCLASS:
1125 val = np->rxopt.bits.rxtclass;
1126 break;
1127
1128 case IPV6_FLOWINFO:
1129 val = np->rxopt.bits.rxflow;
1130 break;
1131
1132 case IPV6_RECVPATHMTU:
1133 val = np->rxopt.bits.rxpmtu;
1134 break;
1135
1136 case IPV6_PATHMTU:
1137 {
1138 struct dst_entry *dst;
1139 struct ip6_mtuinfo mtuinfo;
1140
1141 if (len < sizeof(mtuinfo))
1142 return -EINVAL;
1143
1144 len = sizeof(mtuinfo);
1145 memset(&mtuinfo, 0, sizeof(mtuinfo));
1146
1147 rcu_read_lock();
1148 dst = __sk_dst_get(sk);
1149 if (dst)
1150 mtuinfo.ip6m_mtu = dst_mtu(dst);
1151 rcu_read_unlock();
1152 if (!mtuinfo.ip6m_mtu)
1153 return -ENOTCONN;
1154
1155 if (put_user(len, optlen))
1156 return -EFAULT;
1157 if (copy_to_user(optval, &mtuinfo, len))
1158 return -EFAULT;
1159
1160 return 0;
1161 break;
1162 }
1163
1164 case IPV6_TRANSPARENT:
1165 val = inet_sk(sk)->transparent;
1166 break;
1167
1168 case IPV6_RECVORIGDSTADDR:
1169 val = np->rxopt.bits.rxorigdstaddr;
1170 break;
1171
1172 case IPV6_UNICAST_HOPS:
1173 case IPV6_MULTICAST_HOPS:
1174 {
1175 struct dst_entry *dst;
1176
1177 if (optname == IPV6_UNICAST_HOPS)
1178 val = np->hop_limit;
1179 else
1180 val = np->mcast_hops;
1181
1182 if (val < 0) {
1183 rcu_read_lock();
1184 dst = __sk_dst_get(sk);
1185 if (dst)
1186 val = ip6_dst_hoplimit(dst);
1187 rcu_read_unlock();
1188 }
1189
1190 if (val < 0)
1191 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1192 break;
1193 }
1194
1195 case IPV6_MULTICAST_LOOP:
1196 val = np->mc_loop;
1197 break;
1198
1199 case IPV6_MULTICAST_IF:
1200 val = np->mcast_oif;
1201 break;
1202
1203 case IPV6_UNICAST_IF:
1204 val = (__force int)htonl((__u32) np->ucast_oif);
1205 break;
1206
1207 case IPV6_MTU_DISCOVER:
1208 val = np->pmtudisc;
1209 break;
1210
1211 case IPV6_RECVERR:
1212 val = np->recverr;
1213 break;
1214
1215 case IPV6_FLOWINFO_SEND:
1216 val = np->sndflow;
1217 break;
1218
1219 case IPV6_FLOWLABEL_MGR:
1220 {
1221 struct in6_flowlabel_req freq;
1222 int flags;
1223
1224 if (len < sizeof(freq))
1225 return -EINVAL;
1226
1227 if (copy_from_user(&freq, optval, sizeof(freq)))
1228 return -EFAULT;
1229
1230 if (freq.flr_action != IPV6_FL_A_GET)
1231 return -EINVAL;
1232
1233 len = sizeof(freq);
1234 flags = freq.flr_flags;
1235
1236 memset(&freq, 0, sizeof(freq));
1237
1238 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1239 if (val < 0)
1240 return val;
1241
1242 if (put_user(len, optlen))
1243 return -EFAULT;
1244 if (copy_to_user(optval, &freq, len))
1245 return -EFAULT;
1246
1247 return 0;
1248 }
1249
1250 case IPV6_ADDR_PREFERENCES:
1251 val = 0;
1252
1253 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1254 val |= IPV6_PREFER_SRC_TMP;
1255 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1256 val |= IPV6_PREFER_SRC_PUBLIC;
1257 else {
1258 /* XXX: should we return system default? */
1259 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1260 }
1261
1262 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1263 val |= IPV6_PREFER_SRC_COA;
1264 else
1265 val |= IPV6_PREFER_SRC_HOME;
1266 break;
1267
1268 case IPV6_MINHOPCOUNT:
1269 val = np->min_hopcount;
1270 break;
1271
1272 case IPV6_DONTFRAG:
1273 val = np->dontfrag;
1274 break;
1275
1276 default:
1277 return -ENOPROTOOPT;
1278 }
1279 len = min_t(unsigned int, sizeof(int), len);
1280 if(put_user(len, optlen))
1281 return -EFAULT;
1282 if(copy_to_user(optval,&val,len))
1283 return -EFAULT;
1284 return 0;
1285}
1286
1287int ipv6_getsockopt(struct sock *sk, int level, int optname,
1288 char __user *optval, int __user *optlen)
1289{
1290 int err;
1291
1292 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1293 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1294
1295 if(level != SOL_IPV6)
1296 return -ENOPROTOOPT;
1297
1298 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1299#ifdef CONFIG_NETFILTER
1300 /* we need to exclude all possible ENOPROTOOPTs except default case */
1301 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1302 int len;
1303
1304 if (get_user(len, optlen))
1305 return -EFAULT;
1306
1307 lock_sock(sk);
1308 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1309 &len);
1310 release_sock(sk);
1311 if (err >= 0)
1312 err = put_user(len, optlen);
1313 }
1314#endif
1315 return err;
1316}
1317
1318EXPORT_SYMBOL(ipv6_getsockopt);
1319
1320#ifdef CONFIG_COMPAT
1321int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1322 char __user *optval, int __user *optlen)
1323{
1324 int err;
1325
1326 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1327 if (udp_prot.compat_getsockopt != NULL)
1328 return udp_prot.compat_getsockopt(sk, level, optname,
1329 optval, optlen);
1330 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1331 }
1332
1333 if (level != SOL_IPV6)
1334 return -ENOPROTOOPT;
1335
1336 if (optname == MCAST_MSFILTER)
1337 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1338 ipv6_getsockopt);
1339
1340 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1341 MSG_CMSG_COMPAT);
1342#ifdef CONFIG_NETFILTER
1343 /* we need to exclude all possible ENOPROTOOPTs except default case */
1344 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1345 int len;
1346
1347 if (get_user(len, optlen))
1348 return -EFAULT;
1349
1350 lock_sock(sk);
1351 err = compat_nf_getsockopt(sk, PF_INET6,
1352 optname, optval, &len);
1353 release_sock(sk);
1354 if (err >= 0)
1355 err = put_user(len, optlen);
1356 }
1357#endif
1358 return err;
1359}
1360
1361EXPORT_SYMBOL(compat_ipv6_getsockopt);
1362#endif
1363
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IPv6 BSD socket options interface
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on linux/net/ipv4/ip_sockglue.c
10 *
11 * FIXME: Make the setsockopt code POSIX compliant: That is
12 *
13 * o Truncate getsockopt returns
14 * o Return an optlen of the truncated length if need be
15 *
16 * Changes:
17 * David L Stevens <dlstevens@us.ibm.com>:
18 * - added multicast source filtering API for MLDv2
19 */
20
21#include <linux/module.h>
22#include <linux/capability.h>
23#include <linux/errno.h>
24#include <linux/types.h>
25#include <linux/socket.h>
26#include <linux/sockios.h>
27#include <linux/net.h>
28#include <linux/in6.h>
29#include <linux/mroute6.h>
30#include <linux/netdevice.h>
31#include <linux/if_arp.h>
32#include <linux/init.h>
33#include <linux/sysctl.h>
34#include <linux/netfilter.h>
35#include <linux/slab.h>
36
37#include <net/sock.h>
38#include <net/snmp.h>
39#include <net/ipv6.h>
40#include <net/ndisc.h>
41#include <net/protocol.h>
42#include <net/transp_v6.h>
43#include <net/ip6_route.h>
44#include <net/addrconf.h>
45#include <net/inet_common.h>
46#include <net/tcp.h>
47#include <net/udp.h>
48#include <net/udplite.h>
49#include <net/xfrm.h>
50#include <net/compat.h>
51#include <net/seg6.h>
52
53#include <linux/uaccess.h>
54
55struct ip6_ra_chain *ip6_ra_chain;
56DEFINE_RWLOCK(ip6_ra_lock);
57
58DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount);
59
60int ip6_ra_control(struct sock *sk, int sel)
61{
62 struct ip6_ra_chain *ra, *new_ra, **rap;
63
64 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
65 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
66 return -ENOPROTOOPT;
67
68 new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
69 if (sel >= 0 && !new_ra)
70 return -ENOMEM;
71
72 write_lock_bh(&ip6_ra_lock);
73 for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
74 if (ra->sk == sk) {
75 if (sel >= 0) {
76 write_unlock_bh(&ip6_ra_lock);
77 kfree(new_ra);
78 return -EADDRINUSE;
79 }
80
81 *rap = ra->next;
82 write_unlock_bh(&ip6_ra_lock);
83
84 sock_put(sk);
85 kfree(ra);
86 return 0;
87 }
88 }
89 if (!new_ra) {
90 write_unlock_bh(&ip6_ra_lock);
91 return -ENOBUFS;
92 }
93 new_ra->sk = sk;
94 new_ra->sel = sel;
95 new_ra->next = ra;
96 *rap = new_ra;
97 sock_hold(sk);
98 write_unlock_bh(&ip6_ra_lock);
99 return 0;
100}
101
102struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
103 struct ipv6_txoptions *opt)
104{
105 if (inet_test_bit(IS_ICSK, sk)) {
106 if (opt &&
107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
109 struct inet_connection_sock *icsk = inet_csk(sk);
110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
112 }
113 }
114 opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
115 opt);
116 sk_dst_reset(sk);
117
118 return opt;
119}
120
121static bool setsockopt_needs_rtnl(int optname)
122{
123 switch (optname) {
124 case IPV6_ADDRFORM:
125 case IPV6_ADD_MEMBERSHIP:
126 case IPV6_DROP_MEMBERSHIP:
127 case IPV6_JOIN_ANYCAST:
128 case IPV6_LEAVE_ANYCAST:
129 case MCAST_JOIN_GROUP:
130 case MCAST_LEAVE_GROUP:
131 case MCAST_JOIN_SOURCE_GROUP:
132 case MCAST_LEAVE_SOURCE_GROUP:
133 case MCAST_BLOCK_SOURCE:
134 case MCAST_UNBLOCK_SOURCE:
135 case MCAST_MSFILTER:
136 return true;
137 }
138 return false;
139}
140
141static int copy_group_source_from_sockptr(struct group_source_req *greqs,
142 sockptr_t optval, int optlen)
143{
144 if (in_compat_syscall()) {
145 struct compat_group_source_req gr32;
146
147 if (optlen < sizeof(gr32))
148 return -EINVAL;
149 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
150 return -EFAULT;
151 greqs->gsr_interface = gr32.gsr_interface;
152 greqs->gsr_group = gr32.gsr_group;
153 greqs->gsr_source = gr32.gsr_source;
154 } else {
155 if (optlen < sizeof(*greqs))
156 return -EINVAL;
157 if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
158 return -EFAULT;
159 }
160
161 return 0;
162}
163
164static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
165 sockptr_t optval, int optlen)
166{
167 struct group_source_req greqs;
168 int omode, add;
169 int ret;
170
171 ret = copy_group_source_from_sockptr(&greqs, optval, optlen);
172 if (ret)
173 return ret;
174
175 if (greqs.gsr_group.ss_family != AF_INET6 ||
176 greqs.gsr_source.ss_family != AF_INET6)
177 return -EADDRNOTAVAIL;
178
179 if (optname == MCAST_BLOCK_SOURCE) {
180 omode = MCAST_EXCLUDE;
181 add = 1;
182 } else if (optname == MCAST_UNBLOCK_SOURCE) {
183 omode = MCAST_EXCLUDE;
184 add = 0;
185 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
186 struct sockaddr_in6 *psin6;
187 int retv;
188
189 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
190 retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
191 &psin6->sin6_addr,
192 MCAST_INCLUDE);
193 /* prior join w/ different source is ok */
194 if (retv && retv != -EADDRINUSE)
195 return retv;
196 omode = MCAST_INCLUDE;
197 add = 1;
198 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
199 omode = MCAST_INCLUDE;
200 add = 0;
201 }
202 return ip6_mc_source(add, omode, sk, &greqs);
203}
204
205static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
206 int optlen)
207{
208 struct group_filter *gsf;
209 int ret;
210
211 if (optlen < GROUP_FILTER_SIZE(0))
212 return -EINVAL;
213 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max))
214 return -ENOBUFS;
215
216 gsf = memdup_sockptr(optval, optlen);
217 if (IS_ERR(gsf))
218 return PTR_ERR(gsf);
219
220 /* numsrc >= (4G-140)/128 overflow in 32 bits */
221 ret = -ENOBUFS;
222 if (gsf->gf_numsrc >= 0x1ffffffU ||
223 gsf->gf_numsrc > sysctl_mld_max_msf)
224 goto out_free_gsf;
225
226 ret = -EINVAL;
227 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
228 goto out_free_gsf;
229
230 ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist_flex);
231out_free_gsf:
232 kfree(gsf);
233 return ret;
234}
235
236static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
237 int optlen)
238{
239 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
240 struct compat_group_filter *gf32;
241 void *p;
242 int ret;
243 int n;
244
245 if (optlen < size0)
246 return -EINVAL;
247 if (optlen > READ_ONCE(sock_net(sk)->core.sysctl_optmem_max) - 4)
248 return -ENOBUFS;
249
250 p = kmalloc(optlen + 4, GFP_KERNEL);
251 if (!p)
252 return -ENOMEM;
253
254 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
255 ret = -EFAULT;
256 if (copy_from_sockptr(gf32, optval, optlen))
257 goto out_free_p;
258
259 /* numsrc >= (4G-140)/128 overflow in 32 bits */
260 ret = -ENOBUFS;
261 n = gf32->gf_numsrc;
262 if (n >= 0x1ffffffU || n > sysctl_mld_max_msf)
263 goto out_free_p;
264
265 ret = -EINVAL;
266 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
267 goto out_free_p;
268
269 ret = ip6_mc_msfilter(sk, &(struct group_filter){
270 .gf_interface = gf32->gf_interface,
271 .gf_group = gf32->gf_group,
272 .gf_fmode = gf32->gf_fmode,
273 .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist_flex);
274
275out_free_p:
276 kfree(p);
277 return ret;
278}
279
280static int ipv6_mcast_join_leave(struct sock *sk, int optname,
281 sockptr_t optval, int optlen)
282{
283 struct sockaddr_in6 *psin6;
284 struct group_req greq;
285
286 if (optlen < sizeof(greq))
287 return -EINVAL;
288 if (copy_from_sockptr(&greq, optval, sizeof(greq)))
289 return -EFAULT;
290
291 if (greq.gr_group.ss_family != AF_INET6)
292 return -EADDRNOTAVAIL;
293 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
294 if (optname == MCAST_JOIN_GROUP)
295 return ipv6_sock_mc_join(sk, greq.gr_interface,
296 &psin6->sin6_addr);
297 return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr);
298}
299
300static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
301 sockptr_t optval, int optlen)
302{
303 struct compat_group_req gr32;
304 struct sockaddr_in6 *psin6;
305
306 if (optlen < sizeof(gr32))
307 return -EINVAL;
308 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
309 return -EFAULT;
310
311 if (gr32.gr_group.ss_family != AF_INET6)
312 return -EADDRNOTAVAIL;
313 psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
314 if (optname == MCAST_JOIN_GROUP)
315 return ipv6_sock_mc_join(sk, gr32.gr_interface,
316 &psin6->sin6_addr);
317 return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
318}
319
320static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
321 int optlen)
322{
323 struct ipv6_pinfo *np = inet6_sk(sk);
324 struct ipv6_opt_hdr *new = NULL;
325 struct net *net = sock_net(sk);
326 struct ipv6_txoptions *opt;
327 int err;
328
329 /* hop-by-hop / destination options are privileged option */
330 if (optname != IPV6_RTHDR && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW))
331 return -EPERM;
332
333 /* remove any sticky options header with a zero option
334 * length, per RFC3542.
335 */
336 if (optlen > 0) {
337 if (sockptr_is_null(optval))
338 return -EINVAL;
339 if (optlen < sizeof(struct ipv6_opt_hdr) ||
340 optlen & 0x7 ||
341 optlen > 8 * 255)
342 return -EINVAL;
343
344 new = memdup_sockptr(optval, optlen);
345 if (IS_ERR(new))
346 return PTR_ERR(new);
347 if (unlikely(ipv6_optlen(new) > optlen)) {
348 kfree(new);
349 return -EINVAL;
350 }
351 }
352
353 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
354 opt = ipv6_renew_options(sk, opt, optname, new);
355 kfree(new);
356 if (IS_ERR(opt))
357 return PTR_ERR(opt);
358
359 /* routing header option needs extra check */
360 err = -EINVAL;
361 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
362 struct ipv6_rt_hdr *rthdr = opt->srcrt;
363 switch (rthdr->type) {
364#if IS_ENABLED(CONFIG_IPV6_MIP6)
365 case IPV6_SRCRT_TYPE_2:
366 if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
367 goto sticky_done;
368 break;
369#endif
370 case IPV6_SRCRT_TYPE_4:
371 {
372 struct ipv6_sr_hdr *srh =
373 (struct ipv6_sr_hdr *)opt->srcrt;
374
375 if (!seg6_validate_srh(srh, optlen, false))
376 goto sticky_done;
377 break;
378 }
379 default:
380 goto sticky_done;
381 }
382 }
383
384 err = 0;
385 opt = ipv6_update_options(sk, opt);
386sticky_done:
387 if (opt) {
388 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
389 txopt_put(opt);
390 }
391 return err;
392}
393
394int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
395 sockptr_t optval, unsigned int optlen)
396{
397 struct ipv6_pinfo *np = inet6_sk(sk);
398 struct net *net = sock_net(sk);
399 int val, valbool;
400 int retv = -ENOPROTOOPT;
401 bool needs_rtnl = setsockopt_needs_rtnl(optname);
402
403 if (sockptr_is_null(optval))
404 val = 0;
405 else {
406 if (optlen >= sizeof(int)) {
407 if (copy_from_sockptr(&val, optval, sizeof(val)))
408 return -EFAULT;
409 } else
410 val = 0;
411 }
412
413 valbool = (val != 0);
414
415 if (ip6_mroute_opt(optname))
416 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
417
418 /* Handle options that can be set without locking the socket. */
419 switch (optname) {
420 case IPV6_UNICAST_HOPS:
421 if (optlen < sizeof(int))
422 return -EINVAL;
423 if (val > 255 || val < -1)
424 return -EINVAL;
425 WRITE_ONCE(np->hop_limit, val);
426 return 0;
427 case IPV6_MULTICAST_LOOP:
428 if (optlen < sizeof(int))
429 return -EINVAL;
430 if (val != valbool)
431 return -EINVAL;
432 inet6_assign_bit(MC6_LOOP, sk, valbool);
433 return 0;
434 case IPV6_MULTICAST_HOPS:
435 if (sk->sk_type == SOCK_STREAM)
436 return retv;
437 if (optlen < sizeof(int))
438 return -EINVAL;
439 if (val > 255 || val < -1)
440 return -EINVAL;
441 WRITE_ONCE(np->mcast_hops,
442 val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
443 return 0;
444 case IPV6_MTU:
445 if (optlen < sizeof(int))
446 return -EINVAL;
447 if (val && val < IPV6_MIN_MTU)
448 return -EINVAL;
449 WRITE_ONCE(np->frag_size, val);
450 return 0;
451 case IPV6_MINHOPCOUNT:
452 if (optlen < sizeof(int))
453 return -EINVAL;
454 if (val < 0 || val > 255)
455 return -EINVAL;
456
457 if (val)
458 static_branch_enable(&ip6_min_hopcount);
459
460 /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount
461 * while we are changing it.
462 */
463 WRITE_ONCE(np->min_hopcount, val);
464 return 0;
465 case IPV6_RECVERR_RFC4884:
466 if (optlen < sizeof(int))
467 return -EINVAL;
468 if (val < 0 || val > 1)
469 return -EINVAL;
470 inet6_assign_bit(RECVERR6_RFC4884, sk, valbool);
471 return 0;
472 case IPV6_MULTICAST_ALL:
473 if (optlen < sizeof(int))
474 return -EINVAL;
475 inet6_assign_bit(MC6_ALL, sk, valbool);
476 return 0;
477 case IPV6_AUTOFLOWLABEL:
478 inet6_assign_bit(AUTOFLOWLABEL, sk, valbool);
479 inet6_set_bit(AUTOFLOWLABEL_SET, sk);
480 return 0;
481 case IPV6_DONTFRAG:
482 inet6_assign_bit(DONTFRAG, sk, valbool);
483 return 0;
484 case IPV6_RECVERR:
485 if (optlen < sizeof(int))
486 return -EINVAL;
487 inet6_assign_bit(RECVERR6, sk, valbool);
488 if (!val)
489 skb_errqueue_purge(&sk->sk_error_queue);
490 return 0;
491 case IPV6_ROUTER_ALERT_ISOLATE:
492 if (optlen < sizeof(int))
493 return -EINVAL;
494 inet6_assign_bit(RTALERT_ISOLATE, sk, valbool);
495 return 0;
496 case IPV6_MTU_DISCOVER:
497 if (optlen < sizeof(int))
498 return -EINVAL;
499 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
500 return -EINVAL;
501 WRITE_ONCE(np->pmtudisc, val);
502 return 0;
503 case IPV6_FLOWINFO_SEND:
504 if (optlen < sizeof(int))
505 return -EINVAL;
506 inet6_assign_bit(SNDFLOW, sk, valbool);
507 return 0;
508 case IPV6_ADDR_PREFERENCES:
509 if (optlen < sizeof(int))
510 return -EINVAL;
511 return ip6_sock_set_addr_preferences(sk, val);
512 case IPV6_MULTICAST_IF:
513 if (sk->sk_type == SOCK_STREAM)
514 return -ENOPROTOOPT;
515 if (optlen < sizeof(int))
516 return -EINVAL;
517 if (val) {
518 struct net_device *dev;
519 int bound_dev_if, midx;
520
521 rcu_read_lock();
522
523 dev = dev_get_by_index_rcu(net, val);
524 if (!dev) {
525 rcu_read_unlock();
526 return -ENODEV;
527 }
528 midx = l3mdev_master_ifindex_rcu(dev);
529
530 rcu_read_unlock();
531
532 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
533 if (bound_dev_if &&
534 bound_dev_if != val &&
535 (!midx || midx != bound_dev_if))
536 return -EINVAL;
537 }
538 WRITE_ONCE(np->mcast_oif, val);
539 return 0;
540 case IPV6_UNICAST_IF:
541 {
542 struct net_device *dev;
543 int ifindex;
544
545 if (optlen != sizeof(int))
546 return -EINVAL;
547
548 ifindex = (__force int)ntohl((__force __be32)val);
549 if (!ifindex) {
550 WRITE_ONCE(np->ucast_oif, 0);
551 return 0;
552 }
553
554 dev = dev_get_by_index(net, ifindex);
555 if (!dev)
556 return -EADDRNOTAVAIL;
557 dev_put(dev);
558
559 if (READ_ONCE(sk->sk_bound_dev_if))
560 return -EINVAL;
561
562 WRITE_ONCE(np->ucast_oif, ifindex);
563 return 0;
564 }
565 }
566 if (needs_rtnl)
567 rtnl_lock();
568 sockopt_lock_sock(sk);
569
570 /* Another thread has converted the socket into IPv4 with
571 * IPV6_ADDRFORM concurrently.
572 */
573 if (unlikely(sk->sk_family != AF_INET6))
574 goto unlock;
575
576 switch (optname) {
577
578 case IPV6_ADDRFORM:
579 if (optlen < sizeof(int))
580 goto e_inval;
581 if (val == PF_INET) {
582 if (sk->sk_type == SOCK_RAW)
583 break;
584
585 if (sk->sk_protocol == IPPROTO_UDP ||
586 sk->sk_protocol == IPPROTO_UDPLITE) {
587 struct udp_sock *up = udp_sk(sk);
588 if (up->pending == AF_INET6) {
589 retv = -EBUSY;
590 break;
591 }
592 } else if (sk->sk_protocol == IPPROTO_TCP) {
593 if (sk->sk_prot != &tcpv6_prot) {
594 retv = -EBUSY;
595 break;
596 }
597 } else {
598 break;
599 }
600
601 if (sk->sk_state != TCP_ESTABLISHED) {
602 retv = -ENOTCONN;
603 break;
604 }
605
606 if (ipv6_only_sock(sk) ||
607 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
608 retv = -EADDRNOTAVAIL;
609 break;
610 }
611
612 __ipv6_sock_mc_close(sk);
613 __ipv6_sock_ac_close(sk);
614
615 if (sk->sk_protocol == IPPROTO_TCP) {
616 struct inet_connection_sock *icsk = inet_csk(sk);
617
618 sock_prot_inuse_add(net, sk->sk_prot, -1);
619 sock_prot_inuse_add(net, &tcp_prot, 1);
620
621 /* Paired with READ_ONCE(sk->sk_prot) in inet6_stream_ops */
622 WRITE_ONCE(sk->sk_prot, &tcp_prot);
623 /* Paired with READ_ONCE() in tcp_(get|set)sockopt() */
624 WRITE_ONCE(icsk->icsk_af_ops, &ipv4_specific);
625 WRITE_ONCE(sk->sk_socket->ops, &inet_stream_ops);
626 WRITE_ONCE(sk->sk_family, PF_INET);
627 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
628 } else {
629 struct proto *prot = &udp_prot;
630
631 if (sk->sk_protocol == IPPROTO_UDPLITE)
632 prot = &udplite_prot;
633
634 sock_prot_inuse_add(net, sk->sk_prot, -1);
635 sock_prot_inuse_add(net, prot, 1);
636
637 /* Paired with READ_ONCE(sk->sk_prot) in inet6_dgram_ops */
638 WRITE_ONCE(sk->sk_prot, prot);
639 WRITE_ONCE(sk->sk_socket->ops, &inet_dgram_ops);
640 WRITE_ONCE(sk->sk_family, PF_INET);
641 }
642
643 /* Disable all options not to allocate memory anymore,
644 * but there is still a race. See the lockless path
645 * in udpv6_sendmsg() and ipv6_local_rxpmtu().
646 */
647 np->rxopt.all = 0;
648
649 inet6_cleanup_sock(sk);
650
651 module_put(THIS_MODULE);
652 retv = 0;
653 break;
654 }
655 goto e_inval;
656
657 case IPV6_V6ONLY:
658 if (optlen < sizeof(int) ||
659 inet_sk(sk)->inet_num)
660 goto e_inval;
661 sk->sk_ipv6only = valbool;
662 retv = 0;
663 break;
664
665 case IPV6_RECVPKTINFO:
666 if (optlen < sizeof(int))
667 goto e_inval;
668 np->rxopt.bits.rxinfo = valbool;
669 retv = 0;
670 break;
671
672 case IPV6_2292PKTINFO:
673 if (optlen < sizeof(int))
674 goto e_inval;
675 np->rxopt.bits.rxoinfo = valbool;
676 retv = 0;
677 break;
678
679 case IPV6_RECVHOPLIMIT:
680 if (optlen < sizeof(int))
681 goto e_inval;
682 np->rxopt.bits.rxhlim = valbool;
683 retv = 0;
684 break;
685
686 case IPV6_2292HOPLIMIT:
687 if (optlen < sizeof(int))
688 goto e_inval;
689 np->rxopt.bits.rxohlim = valbool;
690 retv = 0;
691 break;
692
693 case IPV6_RECVRTHDR:
694 if (optlen < sizeof(int))
695 goto e_inval;
696 np->rxopt.bits.srcrt = valbool;
697 retv = 0;
698 break;
699
700 case IPV6_2292RTHDR:
701 if (optlen < sizeof(int))
702 goto e_inval;
703 np->rxopt.bits.osrcrt = valbool;
704 retv = 0;
705 break;
706
707 case IPV6_RECVHOPOPTS:
708 if (optlen < sizeof(int))
709 goto e_inval;
710 np->rxopt.bits.hopopts = valbool;
711 retv = 0;
712 break;
713
714 case IPV6_2292HOPOPTS:
715 if (optlen < sizeof(int))
716 goto e_inval;
717 np->rxopt.bits.ohopopts = valbool;
718 retv = 0;
719 break;
720
721 case IPV6_RECVDSTOPTS:
722 if (optlen < sizeof(int))
723 goto e_inval;
724 np->rxopt.bits.dstopts = valbool;
725 retv = 0;
726 break;
727
728 case IPV6_2292DSTOPTS:
729 if (optlen < sizeof(int))
730 goto e_inval;
731 np->rxopt.bits.odstopts = valbool;
732 retv = 0;
733 break;
734
735 case IPV6_TCLASS:
736 if (optlen < sizeof(int))
737 goto e_inval;
738 if (val < -1 || val > 0xff)
739 goto e_inval;
740 /* RFC 3542, 6.5: default traffic class of 0x0 */
741 if (val == -1)
742 val = 0;
743 if (sk->sk_type == SOCK_STREAM) {
744 val &= ~INET_ECN_MASK;
745 val |= np->tclass & INET_ECN_MASK;
746 }
747 if (np->tclass != val) {
748 np->tclass = val;
749 sk_dst_reset(sk);
750 }
751 retv = 0;
752 break;
753
754 case IPV6_RECVTCLASS:
755 if (optlen < sizeof(int))
756 goto e_inval;
757 np->rxopt.bits.rxtclass = valbool;
758 retv = 0;
759 break;
760
761 case IPV6_FLOWINFO:
762 if (optlen < sizeof(int))
763 goto e_inval;
764 np->rxopt.bits.rxflow = valbool;
765 retv = 0;
766 break;
767
768 case IPV6_RECVPATHMTU:
769 if (optlen < sizeof(int))
770 goto e_inval;
771 np->rxopt.bits.rxpmtu = valbool;
772 retv = 0;
773 break;
774
775 case IPV6_TRANSPARENT:
776 if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) &&
777 !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) {
778 retv = -EPERM;
779 break;
780 }
781 if (optlen < sizeof(int))
782 goto e_inval;
783 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
784 inet_assign_bit(TRANSPARENT, sk, valbool);
785 retv = 0;
786 break;
787
788 case IPV6_FREEBIND:
789 if (optlen < sizeof(int))
790 goto e_inval;
791 /* we also don't have a separate freebind bit for IPV6 */
792 inet_assign_bit(FREEBIND, sk, valbool);
793 retv = 0;
794 break;
795
796 case IPV6_RECVORIGDSTADDR:
797 if (optlen < sizeof(int))
798 goto e_inval;
799 np->rxopt.bits.rxorigdstaddr = valbool;
800 retv = 0;
801 break;
802
803 case IPV6_HOPOPTS:
804 case IPV6_RTHDRDSTOPTS:
805 case IPV6_RTHDR:
806 case IPV6_DSTOPTS:
807 retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
808 break;
809
810 case IPV6_PKTINFO:
811 {
812 struct in6_pktinfo pkt;
813
814 if (optlen == 0)
815 goto e_inval;
816 else if (optlen < sizeof(struct in6_pktinfo) ||
817 sockptr_is_null(optval))
818 goto e_inval;
819
820 if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
821 retv = -EFAULT;
822 break;
823 }
824 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
825 goto e_inval;
826
827 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
828 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
829 retv = 0;
830 break;
831 }
832
833 case IPV6_2292PKTOPTIONS:
834 {
835 struct ipv6_txoptions *opt = NULL;
836 struct msghdr msg;
837 struct flowi6 fl6;
838 struct ipcm6_cookie ipc6;
839
840 memset(&fl6, 0, sizeof(fl6));
841 fl6.flowi6_oif = sk->sk_bound_dev_if;
842 fl6.flowi6_mark = sk->sk_mark;
843
844 if (optlen == 0)
845 goto update;
846
847 /* 1K is probably excessive
848 * 1K is surely not enough, 2K per standard header is 16K.
849 */
850 retv = -EINVAL;
851 if (optlen > 64*1024)
852 break;
853
854 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
855 retv = -ENOBUFS;
856 if (!opt)
857 break;
858
859 memset(opt, 0, sizeof(*opt));
860 refcount_set(&opt->refcnt, 1);
861 opt->tot_len = sizeof(*opt) + optlen;
862 retv = -EFAULT;
863 if (copy_from_sockptr(opt + 1, optval, optlen))
864 goto done;
865
866 msg.msg_controllen = optlen;
867 msg.msg_control_is_user = false;
868 msg.msg_control = (void *)(opt+1);
869 ipc6.opt = opt;
870
871 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
872 if (retv)
873 goto done;
874update:
875 retv = 0;
876 opt = ipv6_update_options(sk, opt);
877done:
878 if (opt) {
879 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
880 txopt_put(opt);
881 }
882 break;
883 }
884
885 case IPV6_ADD_MEMBERSHIP:
886 case IPV6_DROP_MEMBERSHIP:
887 {
888 struct ipv6_mreq mreq;
889
890 if (optlen < sizeof(struct ipv6_mreq))
891 goto e_inval;
892
893 retv = -EPROTO;
894 if (inet_test_bit(IS_ICSK, sk))
895 break;
896
897 retv = -EFAULT;
898 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
899 break;
900
901 if (optname == IPV6_ADD_MEMBERSHIP)
902 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
903 else
904 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
905 break;
906 }
907 case IPV6_JOIN_ANYCAST:
908 case IPV6_LEAVE_ANYCAST:
909 {
910 struct ipv6_mreq mreq;
911
912 if (optlen < sizeof(struct ipv6_mreq))
913 goto e_inval;
914
915 retv = -EFAULT;
916 if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
917 break;
918
919 if (optname == IPV6_JOIN_ANYCAST)
920 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
921 else
922 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
923 break;
924 }
925 case MCAST_JOIN_GROUP:
926 case MCAST_LEAVE_GROUP:
927 if (in_compat_syscall())
928 retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
929 optlen);
930 else
931 retv = ipv6_mcast_join_leave(sk, optname, optval,
932 optlen);
933 break;
934 case MCAST_JOIN_SOURCE_GROUP:
935 case MCAST_LEAVE_SOURCE_GROUP:
936 case MCAST_BLOCK_SOURCE:
937 case MCAST_UNBLOCK_SOURCE:
938 retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
939 break;
940 case MCAST_MSFILTER:
941 if (in_compat_syscall())
942 retv = compat_ipv6_set_mcast_msfilter(sk, optval,
943 optlen);
944 else
945 retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
946 break;
947 case IPV6_ROUTER_ALERT:
948 if (optlen < sizeof(int))
949 goto e_inval;
950 retv = ip6_ra_control(sk, val);
951 break;
952 case IPV6_FLOWLABEL_MGR:
953 retv = ipv6_flowlabel_opt(sk, optval, optlen);
954 break;
955 case IPV6_IPSEC_POLICY:
956 case IPV6_XFRM_POLICY:
957 retv = -EPERM;
958 if (!sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN))
959 break;
960 retv = xfrm_user_policy(sk, optname, optval, optlen);
961 break;
962
963 case IPV6_RECVFRAGSIZE:
964 np->rxopt.bits.recvfragsize = valbool;
965 retv = 0;
966 break;
967 }
968
969unlock:
970 sockopt_release_sock(sk);
971 if (needs_rtnl)
972 rtnl_unlock();
973
974 return retv;
975
976e_inval:
977 retv = -EINVAL;
978 goto unlock;
979}
980
981int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
982 unsigned int optlen)
983{
984 int err;
985
986 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
987 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
988
989 if (level != SOL_IPV6)
990 return -ENOPROTOOPT;
991
992 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
993#ifdef CONFIG_NETFILTER
994 /* we need to exclude all possible ENOPROTOOPTs except default case */
995 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
996 optname != IPV6_XFRM_POLICY)
997 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
998#endif
999 return err;
1000}
1001EXPORT_SYMBOL(ipv6_setsockopt);
1002
1003static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
1004 int optname, sockptr_t optval, int len)
1005{
1006 struct ipv6_opt_hdr *hdr;
1007
1008 if (!opt)
1009 return 0;
1010
1011 switch (optname) {
1012 case IPV6_HOPOPTS:
1013 hdr = opt->hopopt;
1014 break;
1015 case IPV6_RTHDRDSTOPTS:
1016 hdr = opt->dst0opt;
1017 break;
1018 case IPV6_RTHDR:
1019 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1020 break;
1021 case IPV6_DSTOPTS:
1022 hdr = opt->dst1opt;
1023 break;
1024 default:
1025 return -EINVAL; /* should not happen */
1026 }
1027
1028 if (!hdr)
1029 return 0;
1030
1031 len = min_t(unsigned int, len, ipv6_optlen(hdr));
1032 if (copy_to_sockptr(optval, hdr, len))
1033 return -EFAULT;
1034 return len;
1035}
1036
1037static int ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1038 sockptr_t optlen, int len)
1039{
1040 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1041 struct group_filter gsf;
1042 int num;
1043 int err;
1044
1045 if (len < size0)
1046 return -EINVAL;
1047 if (copy_from_sockptr(&gsf, optval, size0))
1048 return -EFAULT;
1049 if (gsf.gf_group.ss_family != AF_INET6)
1050 return -EADDRNOTAVAIL;
1051 num = gsf.gf_numsrc;
1052 sockopt_lock_sock(sk);
1053 err = ip6_mc_msfget(sk, &gsf, optval, size0);
1054 if (!err) {
1055 if (num > gsf.gf_numsrc)
1056 num = gsf.gf_numsrc;
1057 len = GROUP_FILTER_SIZE(num);
1058 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1059 copy_to_sockptr(optval, &gsf, size0))
1060 err = -EFAULT;
1061 }
1062 sockopt_release_sock(sk);
1063 return err;
1064}
1065
1066static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval,
1067 sockptr_t optlen, int len)
1068{
1069 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1070 struct compat_group_filter gf32;
1071 struct group_filter gf;
1072 int err;
1073 int num;
1074
1075 if (len < size0)
1076 return -EINVAL;
1077
1078 if (copy_from_sockptr(&gf32, optval, size0))
1079 return -EFAULT;
1080 gf.gf_interface = gf32.gf_interface;
1081 gf.gf_fmode = gf32.gf_fmode;
1082 num = gf.gf_numsrc = gf32.gf_numsrc;
1083 gf.gf_group = gf32.gf_group;
1084
1085 if (gf.gf_group.ss_family != AF_INET6)
1086 return -EADDRNOTAVAIL;
1087
1088 sockopt_lock_sock(sk);
1089 err = ip6_mc_msfget(sk, &gf, optval, size0);
1090 sockopt_release_sock(sk);
1091 if (err)
1092 return err;
1093 if (num > gf.gf_numsrc)
1094 num = gf.gf_numsrc;
1095 len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
1096 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1097 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode),
1098 &gf.gf_fmode, sizeof(gf32.gf_fmode)) ||
1099 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc),
1100 &gf.gf_numsrc, sizeof(gf32.gf_numsrc)))
1101 return -EFAULT;
1102 return 0;
1103}
1104
1105int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1106 sockptr_t optval, sockptr_t optlen)
1107{
1108 struct ipv6_pinfo *np = inet6_sk(sk);
1109 int len;
1110 int val;
1111
1112 if (ip6_mroute_opt(optname))
1113 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1114
1115 if (copy_from_sockptr(&len, optlen, sizeof(int)))
1116 return -EFAULT;
1117 switch (optname) {
1118 case IPV6_ADDRFORM:
1119 if (sk->sk_protocol != IPPROTO_UDP &&
1120 sk->sk_protocol != IPPROTO_UDPLITE &&
1121 sk->sk_protocol != IPPROTO_TCP)
1122 return -ENOPROTOOPT;
1123 if (sk->sk_state != TCP_ESTABLISHED)
1124 return -ENOTCONN;
1125 val = sk->sk_family;
1126 break;
1127 case MCAST_MSFILTER:
1128 if (in_compat_syscall())
1129 return compat_ipv6_get_msfilter(sk, optval, optlen, len);
1130 return ipv6_get_msfilter(sk, optval, optlen, len);
1131 case IPV6_2292PKTOPTIONS:
1132 {
1133 struct msghdr msg;
1134 struct sk_buff *skb;
1135
1136 if (sk->sk_type != SOCK_STREAM)
1137 return -ENOPROTOOPT;
1138
1139 if (optval.is_kernel) {
1140 msg.msg_control_is_user = false;
1141 msg.msg_control = optval.kernel;
1142 } else {
1143 msg.msg_control_is_user = true;
1144 msg.msg_control_user = optval.user;
1145 }
1146 msg.msg_controllen = len;
1147 msg.msg_flags = 0;
1148
1149 sockopt_lock_sock(sk);
1150 skb = np->pktoptions;
1151 if (skb)
1152 ip6_datagram_recv_ctl(sk, &msg, skb);
1153 sockopt_release_sock(sk);
1154 if (!skb) {
1155 if (np->rxopt.bits.rxinfo) {
1156 int mcast_oif = READ_ONCE(np->mcast_oif);
1157 struct in6_pktinfo src_info;
1158
1159 src_info.ipi6_ifindex = mcast_oif ? :
1160 np->sticky_pktinfo.ipi6_ifindex;
1161 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1162 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1163 }
1164 if (np->rxopt.bits.rxhlim) {
1165 int hlim = READ_ONCE(np->mcast_hops);
1166
1167 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1168 }
1169 if (np->rxopt.bits.rxtclass) {
1170 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1171
1172 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1173 }
1174 if (np->rxopt.bits.rxoinfo) {
1175 int mcast_oif = READ_ONCE(np->mcast_oif);
1176 struct in6_pktinfo src_info;
1177
1178 src_info.ipi6_ifindex = mcast_oif ? :
1179 np->sticky_pktinfo.ipi6_ifindex;
1180 src_info.ipi6_addr = mcast_oif ? sk->sk_v6_daddr :
1181 np->sticky_pktinfo.ipi6_addr;
1182 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1183 }
1184 if (np->rxopt.bits.rxohlim) {
1185 int hlim = READ_ONCE(np->mcast_hops);
1186
1187 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1188 }
1189 if (np->rxopt.bits.rxflow) {
1190 __be32 flowinfo = np->rcv_flowinfo;
1191
1192 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1193 }
1194 }
1195 len -= msg.msg_controllen;
1196 return copy_to_sockptr(optlen, &len, sizeof(int));
1197 }
1198 case IPV6_MTU:
1199 {
1200 struct dst_entry *dst;
1201
1202 val = 0;
1203 rcu_read_lock();
1204 dst = __sk_dst_get(sk);
1205 if (dst)
1206 val = dst_mtu(dst);
1207 rcu_read_unlock();
1208 if (!val)
1209 return -ENOTCONN;
1210 break;
1211 }
1212
1213 case IPV6_V6ONLY:
1214 val = sk->sk_ipv6only;
1215 break;
1216
1217 case IPV6_RECVPKTINFO:
1218 val = np->rxopt.bits.rxinfo;
1219 break;
1220
1221 case IPV6_2292PKTINFO:
1222 val = np->rxopt.bits.rxoinfo;
1223 break;
1224
1225 case IPV6_RECVHOPLIMIT:
1226 val = np->rxopt.bits.rxhlim;
1227 break;
1228
1229 case IPV6_2292HOPLIMIT:
1230 val = np->rxopt.bits.rxohlim;
1231 break;
1232
1233 case IPV6_RECVRTHDR:
1234 val = np->rxopt.bits.srcrt;
1235 break;
1236
1237 case IPV6_2292RTHDR:
1238 val = np->rxopt.bits.osrcrt;
1239 break;
1240
1241 case IPV6_HOPOPTS:
1242 case IPV6_RTHDRDSTOPTS:
1243 case IPV6_RTHDR:
1244 case IPV6_DSTOPTS:
1245 {
1246 struct ipv6_txoptions *opt;
1247
1248 sockopt_lock_sock(sk);
1249 opt = rcu_dereference_protected(np->opt,
1250 lockdep_sock_is_held(sk));
1251 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1252 sockopt_release_sock(sk);
1253 /* check if ipv6_getsockopt_sticky() returns err code */
1254 if (len < 0)
1255 return len;
1256 return copy_to_sockptr(optlen, &len, sizeof(int));
1257 }
1258
1259 case IPV6_RECVHOPOPTS:
1260 val = np->rxopt.bits.hopopts;
1261 break;
1262
1263 case IPV6_2292HOPOPTS:
1264 val = np->rxopt.bits.ohopopts;
1265 break;
1266
1267 case IPV6_RECVDSTOPTS:
1268 val = np->rxopt.bits.dstopts;
1269 break;
1270
1271 case IPV6_2292DSTOPTS:
1272 val = np->rxopt.bits.odstopts;
1273 break;
1274
1275 case IPV6_TCLASS:
1276 val = np->tclass;
1277 break;
1278
1279 case IPV6_RECVTCLASS:
1280 val = np->rxopt.bits.rxtclass;
1281 break;
1282
1283 case IPV6_FLOWINFO:
1284 val = np->rxopt.bits.rxflow;
1285 break;
1286
1287 case IPV6_RECVPATHMTU:
1288 val = np->rxopt.bits.rxpmtu;
1289 break;
1290
1291 case IPV6_PATHMTU:
1292 {
1293 struct dst_entry *dst;
1294 struct ip6_mtuinfo mtuinfo;
1295
1296 if (len < sizeof(mtuinfo))
1297 return -EINVAL;
1298
1299 len = sizeof(mtuinfo);
1300 memset(&mtuinfo, 0, sizeof(mtuinfo));
1301
1302 rcu_read_lock();
1303 dst = __sk_dst_get(sk);
1304 if (dst)
1305 mtuinfo.ip6m_mtu = dst_mtu(dst);
1306 rcu_read_unlock();
1307 if (!mtuinfo.ip6m_mtu)
1308 return -ENOTCONN;
1309
1310 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1311 return -EFAULT;
1312 if (copy_to_sockptr(optval, &mtuinfo, len))
1313 return -EFAULT;
1314
1315 return 0;
1316 }
1317
1318 case IPV6_TRANSPARENT:
1319 val = inet_test_bit(TRANSPARENT, sk);
1320 break;
1321
1322 case IPV6_FREEBIND:
1323 val = inet_test_bit(FREEBIND, sk);
1324 break;
1325
1326 case IPV6_RECVORIGDSTADDR:
1327 val = np->rxopt.bits.rxorigdstaddr;
1328 break;
1329
1330 case IPV6_UNICAST_HOPS:
1331 case IPV6_MULTICAST_HOPS:
1332 {
1333 struct dst_entry *dst;
1334
1335 if (optname == IPV6_UNICAST_HOPS)
1336 val = READ_ONCE(np->hop_limit);
1337 else
1338 val = READ_ONCE(np->mcast_hops);
1339
1340 if (val < 0) {
1341 rcu_read_lock();
1342 dst = __sk_dst_get(sk);
1343 if (dst)
1344 val = ip6_dst_hoplimit(dst);
1345 rcu_read_unlock();
1346 }
1347
1348 if (val < 0)
1349 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1350 break;
1351 }
1352
1353 case IPV6_MULTICAST_LOOP:
1354 val = inet6_test_bit(MC6_LOOP, sk);
1355 break;
1356
1357 case IPV6_MULTICAST_IF:
1358 val = READ_ONCE(np->mcast_oif);
1359 break;
1360
1361 case IPV6_MULTICAST_ALL:
1362 val = inet6_test_bit(MC6_ALL, sk);
1363 break;
1364
1365 case IPV6_UNICAST_IF:
1366 val = (__force int)htonl((__u32) READ_ONCE(np->ucast_oif));
1367 break;
1368
1369 case IPV6_MTU_DISCOVER:
1370 val = READ_ONCE(np->pmtudisc);
1371 break;
1372
1373 case IPV6_RECVERR:
1374 val = inet6_test_bit(RECVERR6, sk);
1375 break;
1376
1377 case IPV6_FLOWINFO_SEND:
1378 val = inet6_test_bit(SNDFLOW, sk);
1379 break;
1380
1381 case IPV6_FLOWLABEL_MGR:
1382 {
1383 struct in6_flowlabel_req freq;
1384 int flags;
1385
1386 if (len < sizeof(freq))
1387 return -EINVAL;
1388
1389 if (copy_from_sockptr(&freq, optval, sizeof(freq)))
1390 return -EFAULT;
1391
1392 if (freq.flr_action != IPV6_FL_A_GET)
1393 return -EINVAL;
1394
1395 len = sizeof(freq);
1396 flags = freq.flr_flags;
1397
1398 memset(&freq, 0, sizeof(freq));
1399
1400 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1401 if (val < 0)
1402 return val;
1403
1404 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1405 return -EFAULT;
1406 if (copy_to_sockptr(optval, &freq, len))
1407 return -EFAULT;
1408
1409 return 0;
1410 }
1411
1412 case IPV6_ADDR_PREFERENCES:
1413 {
1414 u8 srcprefs = READ_ONCE(np->srcprefs);
1415 val = 0;
1416
1417 if (srcprefs & IPV6_PREFER_SRC_TMP)
1418 val |= IPV6_PREFER_SRC_TMP;
1419 else if (srcprefs & IPV6_PREFER_SRC_PUBLIC)
1420 val |= IPV6_PREFER_SRC_PUBLIC;
1421 else {
1422 /* XXX: should we return system default? */
1423 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1424 }
1425
1426 if (srcprefs & IPV6_PREFER_SRC_COA)
1427 val |= IPV6_PREFER_SRC_COA;
1428 else
1429 val |= IPV6_PREFER_SRC_HOME;
1430 break;
1431 }
1432 case IPV6_MINHOPCOUNT:
1433 val = READ_ONCE(np->min_hopcount);
1434 break;
1435
1436 case IPV6_DONTFRAG:
1437 val = inet6_test_bit(DONTFRAG, sk);
1438 break;
1439
1440 case IPV6_AUTOFLOWLABEL:
1441 val = ip6_autoflowlabel(sock_net(sk), sk);
1442 break;
1443
1444 case IPV6_RECVFRAGSIZE:
1445 val = np->rxopt.bits.recvfragsize;
1446 break;
1447
1448 case IPV6_ROUTER_ALERT_ISOLATE:
1449 val = inet6_test_bit(RTALERT_ISOLATE, sk);
1450 break;
1451
1452 case IPV6_RECVERR_RFC4884:
1453 val = inet6_test_bit(RECVERR6_RFC4884, sk);
1454 break;
1455
1456 default:
1457 return -ENOPROTOOPT;
1458 }
1459 len = min_t(unsigned int, sizeof(int), len);
1460 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1461 return -EFAULT;
1462 if (copy_to_sockptr(optval, &val, len))
1463 return -EFAULT;
1464 return 0;
1465}
1466
1467int ipv6_getsockopt(struct sock *sk, int level, int optname,
1468 char __user *optval, int __user *optlen)
1469{
1470 int err;
1471
1472 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1473 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1474
1475 if (level != SOL_IPV6)
1476 return -ENOPROTOOPT;
1477
1478 err = do_ipv6_getsockopt(sk, level, optname,
1479 USER_SOCKPTR(optval), USER_SOCKPTR(optlen));
1480#ifdef CONFIG_NETFILTER
1481 /* we need to exclude all possible ENOPROTOOPTs except default case */
1482 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1483 int len;
1484
1485 if (get_user(len, optlen))
1486 return -EFAULT;
1487
1488 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1489 if (err >= 0)
1490 err = put_user(len, optlen);
1491 }
1492#endif
1493 return err;
1494}
1495EXPORT_SYMBOL(ipv6_getsockopt);