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