xref: /openbmc/linux/net/ipv6/ipv6_sockglue.c (revision ae3473231e77a3f1909d48cd144cebe5e1d049b3)
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 
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 
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 
102 struct 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 	}
114 	opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
115 		   opt);
116 	sk_dst_reset(sk);
117 
118 	return opt;
119 }
120 
121 static 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 
141 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
142 		    char __user *optval, unsigned int optlen)
143 {
144 	struct ipv6_pinfo *np = inet6_sk(sk);
145 	struct net *net = sock_net(sk);
146 	int val, valbool;
147 	int retv = -ENOPROTOOPT;
148 	bool needs_rtnl = setsockopt_needs_rtnl(optname);
149 
150 	if (!optval)
151 		val = 0;
152 	else {
153 		if (optlen >= sizeof(int)) {
154 			if (get_user(val, (int __user *) optval))
155 				return -EFAULT;
156 		} else
157 			val = 0;
158 	}
159 
160 	valbool = (val != 0);
161 
162 	if (ip6_mroute_opt(optname))
163 		return ip6_mroute_setsockopt(sk, optname, optval, optlen);
164 
165 	if (needs_rtnl)
166 		rtnl_lock();
167 	lock_sock(sk);
168 
169 	switch (optname) {
170 
171 	case IPV6_ADDRFORM:
172 		if (optlen < sizeof(int))
173 			goto e_inval;
174 		if (val == PF_INET) {
175 			struct ipv6_txoptions *opt;
176 			struct sk_buff *pktopt;
177 
178 			if (sk->sk_type == SOCK_RAW)
179 				break;
180 
181 			if (sk->sk_protocol == IPPROTO_UDP ||
182 			    sk->sk_protocol == IPPROTO_UDPLITE) {
183 				struct udp_sock *up = udp_sk(sk);
184 				if (up->pending == AF_INET6) {
185 					retv = -EBUSY;
186 					break;
187 				}
188 			} else if (sk->sk_protocol != IPPROTO_TCP)
189 				break;
190 
191 			if (sk->sk_state != TCP_ESTABLISHED) {
192 				retv = -ENOTCONN;
193 				break;
194 			}
195 
196 			if (ipv6_only_sock(sk) ||
197 			    !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
198 				retv = -EADDRNOTAVAIL;
199 				break;
200 			}
201 
202 			fl6_free_socklist(sk);
203 			__ipv6_sock_mc_close(sk);
204 
205 			/*
206 			 * Sock is moving from IPv6 to IPv4 (sk_prot), so
207 			 * remove it from the refcnt debug socks count in the
208 			 * original family...
209 			 */
210 			sk_refcnt_debug_dec(sk);
211 
212 			if (sk->sk_protocol == IPPROTO_TCP) {
213 				struct inet_connection_sock *icsk = inet_csk(sk);
214 				local_bh_disable();
215 				sock_prot_inuse_add(net, sk->sk_prot, -1);
216 				sock_prot_inuse_add(net, &tcp_prot, 1);
217 				local_bh_enable();
218 				sk->sk_prot = &tcp_prot;
219 				icsk->icsk_af_ops = &ipv4_specific;
220 				sk->sk_socket->ops = &inet_stream_ops;
221 				sk->sk_family = PF_INET;
222 				tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
223 			} else {
224 				struct proto *prot = &udp_prot;
225 
226 				if (sk->sk_protocol == IPPROTO_UDPLITE)
227 					prot = &udplite_prot;
228 				local_bh_disable();
229 				sock_prot_inuse_add(net, sk->sk_prot, -1);
230 				sock_prot_inuse_add(net, prot, 1);
231 				local_bh_enable();
232 				sk->sk_prot = prot;
233 				sk->sk_socket->ops = &inet_dgram_ops;
234 				sk->sk_family = PF_INET;
235 			}
236 			opt = xchg((__force struct ipv6_txoptions **)&np->opt,
237 				   NULL);
238 			if (opt) {
239 				atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
240 				txopt_put(opt);
241 			}
242 			pktopt = xchg(&np->pktoptions, NULL);
243 			kfree_skb(pktopt);
244 
245 			sk->sk_destruct = inet_sock_destruct;
246 			/*
247 			 * ... and add it to the refcnt debug socks count
248 			 * in the new family. -acme
249 			 */
250 			sk_refcnt_debug_inc(sk);
251 			module_put(THIS_MODULE);
252 			retv = 0;
253 			break;
254 		}
255 		goto e_inval;
256 
257 	case IPV6_V6ONLY:
258 		if (optlen < sizeof(int) ||
259 		    inet_sk(sk)->inet_num)
260 			goto e_inval;
261 		sk->sk_ipv6only = valbool;
262 		retv = 0;
263 		break;
264 
265 	case IPV6_RECVPKTINFO:
266 		if (optlen < sizeof(int))
267 			goto e_inval;
268 		np->rxopt.bits.rxinfo = valbool;
269 		retv = 0;
270 		break;
271 
272 	case IPV6_2292PKTINFO:
273 		if (optlen < sizeof(int))
274 			goto e_inval;
275 		np->rxopt.bits.rxoinfo = valbool;
276 		retv = 0;
277 		break;
278 
279 	case IPV6_RECVHOPLIMIT:
280 		if (optlen < sizeof(int))
281 			goto e_inval;
282 		np->rxopt.bits.rxhlim = valbool;
283 		retv = 0;
284 		break;
285 
286 	case IPV6_2292HOPLIMIT:
287 		if (optlen < sizeof(int))
288 			goto e_inval;
289 		np->rxopt.bits.rxohlim = valbool;
290 		retv = 0;
291 		break;
292 
293 	case IPV6_RECVRTHDR:
294 		if (optlen < sizeof(int))
295 			goto e_inval;
296 		np->rxopt.bits.srcrt = valbool;
297 		retv = 0;
298 		break;
299 
300 	case IPV6_2292RTHDR:
301 		if (optlen < sizeof(int))
302 			goto e_inval;
303 		np->rxopt.bits.osrcrt = valbool;
304 		retv = 0;
305 		break;
306 
307 	case IPV6_RECVHOPOPTS:
308 		if (optlen < sizeof(int))
309 			goto e_inval;
310 		np->rxopt.bits.hopopts = valbool;
311 		retv = 0;
312 		break;
313 
314 	case IPV6_2292HOPOPTS:
315 		if (optlen < sizeof(int))
316 			goto e_inval;
317 		np->rxopt.bits.ohopopts = valbool;
318 		retv = 0;
319 		break;
320 
321 	case IPV6_RECVDSTOPTS:
322 		if (optlen < sizeof(int))
323 			goto e_inval;
324 		np->rxopt.bits.dstopts = valbool;
325 		retv = 0;
326 		break;
327 
328 	case IPV6_2292DSTOPTS:
329 		if (optlen < sizeof(int))
330 			goto e_inval;
331 		np->rxopt.bits.odstopts = valbool;
332 		retv = 0;
333 		break;
334 
335 	case IPV6_TCLASS:
336 		if (optlen < sizeof(int))
337 			goto e_inval;
338 		if (val < -1 || val > 0xff)
339 			goto e_inval;
340 		/* RFC 3542, 6.5: default traffic class of 0x0 */
341 		if (val == -1)
342 			val = 0;
343 		np->tclass = val;
344 		retv = 0;
345 		break;
346 
347 	case IPV6_RECVTCLASS:
348 		if (optlen < sizeof(int))
349 			goto e_inval;
350 		np->rxopt.bits.rxtclass = valbool;
351 		retv = 0;
352 		break;
353 
354 	case IPV6_FLOWINFO:
355 		if (optlen < sizeof(int))
356 			goto e_inval;
357 		np->rxopt.bits.rxflow = valbool;
358 		retv = 0;
359 		break;
360 
361 	case IPV6_RECVPATHMTU:
362 		if (optlen < sizeof(int))
363 			goto e_inval;
364 		np->rxopt.bits.rxpmtu = valbool;
365 		retv = 0;
366 		break;
367 
368 	case IPV6_TRANSPARENT:
369 		if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
370 		    !ns_capable(net->user_ns, CAP_NET_RAW)) {
371 			retv = -EPERM;
372 			break;
373 		}
374 		if (optlen < sizeof(int))
375 			goto e_inval;
376 		/* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
377 		inet_sk(sk)->transparent = valbool;
378 		retv = 0;
379 		break;
380 
381 	case IPV6_RECVORIGDSTADDR:
382 		if (optlen < sizeof(int))
383 			goto e_inval;
384 		np->rxopt.bits.rxorigdstaddr = valbool;
385 		retv = 0;
386 		break;
387 
388 	case IPV6_HOPOPTS:
389 	case IPV6_RTHDRDSTOPTS:
390 	case IPV6_RTHDR:
391 	case IPV6_DSTOPTS:
392 	{
393 		struct ipv6_txoptions *opt;
394 
395 		/* remove any sticky options header with a zero option
396 		 * length, per RFC3542.
397 		 */
398 		if (optlen == 0)
399 			optval = NULL;
400 		else if (!optval)
401 			goto e_inval;
402 		else if (optlen < sizeof(struct ipv6_opt_hdr) ||
403 			 optlen & 0x7 || optlen > 8 * 255)
404 			goto e_inval;
405 
406 		/* hop-by-hop / destination options are privileged option */
407 		retv = -EPERM;
408 		if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
409 			break;
410 
411 		opt = rcu_dereference_protected(np->opt,
412 						lockdep_sock_is_held(sk));
413 		opt = ipv6_renew_options(sk, opt, optname,
414 					 (struct ipv6_opt_hdr __user *)optval,
415 					 optlen);
416 		if (IS_ERR(opt)) {
417 			retv = PTR_ERR(opt);
418 			break;
419 		}
420 
421 		/* routing header option needs extra check */
422 		retv = -EINVAL;
423 		if (optname == IPV6_RTHDR && opt && opt->srcrt) {
424 			struct ipv6_rt_hdr *rthdr = opt->srcrt;
425 			switch (rthdr->type) {
426 #if IS_ENABLED(CONFIG_IPV6_MIP6)
427 			case IPV6_SRCRT_TYPE_2:
428 				if (rthdr->hdrlen != 2 ||
429 				    rthdr->segments_left != 1)
430 					goto sticky_done;
431 
432 				break;
433 #endif
434 			case IPV6_SRCRT_TYPE_4:
435 			{
436 				struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
437 							  opt->srcrt;
438 
439 				if (!seg6_validate_srh(srh, optlen))
440 					goto sticky_done;
441 				break;
442 			}
443 			default:
444 				goto sticky_done;
445 			}
446 		}
447 
448 		retv = 0;
449 		opt = ipv6_update_options(sk, opt);
450 sticky_done:
451 		if (opt) {
452 			atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
453 			txopt_put(opt);
454 		}
455 		break;
456 	}
457 
458 	case IPV6_PKTINFO:
459 	{
460 		struct in6_pktinfo pkt;
461 
462 		if (optlen == 0)
463 			goto e_inval;
464 		else if (optlen < sizeof(struct in6_pktinfo) || !optval)
465 			goto e_inval;
466 
467 		if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
468 				retv = -EFAULT;
469 				break;
470 		}
471 		if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
472 			goto e_inval;
473 
474 		np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
475 		np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
476 		retv = 0;
477 		break;
478 	}
479 
480 	case IPV6_2292PKTOPTIONS:
481 	{
482 		struct ipv6_txoptions *opt = NULL;
483 		struct msghdr msg;
484 		struct flowi6 fl6;
485 		struct sockcm_cookie sockc_junk;
486 		struct ipcm6_cookie ipc6;
487 
488 		memset(&fl6, 0, sizeof(fl6));
489 		fl6.flowi6_oif = sk->sk_bound_dev_if;
490 		fl6.flowi6_mark = sk->sk_mark;
491 
492 		if (optlen == 0)
493 			goto update;
494 
495 		/* 1K is probably excessive
496 		 * 1K is surely not enough, 2K per standard header is 16K.
497 		 */
498 		retv = -EINVAL;
499 		if (optlen > 64*1024)
500 			break;
501 
502 		opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
503 		retv = -ENOBUFS;
504 		if (!opt)
505 			break;
506 
507 		memset(opt, 0, sizeof(*opt));
508 		atomic_set(&opt->refcnt, 1);
509 		opt->tot_len = sizeof(*opt) + optlen;
510 		retv = -EFAULT;
511 		if (copy_from_user(opt+1, optval, optlen))
512 			goto done;
513 
514 		msg.msg_controllen = optlen;
515 		msg.msg_control = (void *)(opt+1);
516 		ipc6.opt = opt;
517 
518 		retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
519 		if (retv)
520 			goto done;
521 update:
522 		retv = 0;
523 		opt = ipv6_update_options(sk, opt);
524 done:
525 		if (opt) {
526 			atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
527 			txopt_put(opt);
528 		}
529 		break;
530 	}
531 	case IPV6_UNICAST_HOPS:
532 		if (optlen < sizeof(int))
533 			goto e_inval;
534 		if (val > 255 || val < -1)
535 			goto e_inval;
536 		np->hop_limit = val;
537 		retv = 0;
538 		break;
539 
540 	case IPV6_MULTICAST_HOPS:
541 		if (sk->sk_type == SOCK_STREAM)
542 			break;
543 		if (optlen < sizeof(int))
544 			goto e_inval;
545 		if (val > 255 || val < -1)
546 			goto e_inval;
547 		np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
548 		retv = 0;
549 		break;
550 
551 	case IPV6_MULTICAST_LOOP:
552 		if (optlen < sizeof(int))
553 			goto e_inval;
554 		if (val != valbool)
555 			goto e_inval;
556 		np->mc_loop = valbool;
557 		retv = 0;
558 		break;
559 
560 	case IPV6_UNICAST_IF:
561 	{
562 		struct net_device *dev = NULL;
563 		int ifindex;
564 
565 		if (optlen != sizeof(int))
566 			goto e_inval;
567 
568 		ifindex = (__force int)ntohl((__force __be32)val);
569 		if (ifindex == 0) {
570 			np->ucast_oif = 0;
571 			retv = 0;
572 			break;
573 		}
574 
575 		dev = dev_get_by_index(net, ifindex);
576 		retv = -EADDRNOTAVAIL;
577 		if (!dev)
578 			break;
579 		dev_put(dev);
580 
581 		retv = -EINVAL;
582 		if (sk->sk_bound_dev_if)
583 			break;
584 
585 		np->ucast_oif = ifindex;
586 		retv = 0;
587 		break;
588 	}
589 
590 	case IPV6_MULTICAST_IF:
591 		if (sk->sk_type == SOCK_STREAM)
592 			break;
593 		if (optlen < sizeof(int))
594 			goto e_inval;
595 
596 		if (val) {
597 			struct net_device *dev;
598 
599 			if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
600 				goto e_inval;
601 
602 			dev = dev_get_by_index(net, val);
603 			if (!dev) {
604 				retv = -ENODEV;
605 				break;
606 			}
607 			dev_put(dev);
608 		}
609 		np->mcast_oif = val;
610 		retv = 0;
611 		break;
612 	case IPV6_ADD_MEMBERSHIP:
613 	case IPV6_DROP_MEMBERSHIP:
614 	{
615 		struct ipv6_mreq mreq;
616 
617 		if (optlen < sizeof(struct ipv6_mreq))
618 			goto e_inval;
619 
620 		retv = -EPROTO;
621 		if (inet_sk(sk)->is_icsk)
622 			break;
623 
624 		retv = -EFAULT;
625 		if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
626 			break;
627 
628 		if (optname == IPV6_ADD_MEMBERSHIP)
629 			retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
630 		else
631 			retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
632 		break;
633 	}
634 	case IPV6_JOIN_ANYCAST:
635 	case IPV6_LEAVE_ANYCAST:
636 	{
637 		struct ipv6_mreq mreq;
638 
639 		if (optlen < sizeof(struct ipv6_mreq))
640 			goto e_inval;
641 
642 		retv = -EFAULT;
643 		if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
644 			break;
645 
646 		if (optname == IPV6_JOIN_ANYCAST)
647 			retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
648 		else
649 			retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
650 		break;
651 	}
652 	case MCAST_JOIN_GROUP:
653 	case MCAST_LEAVE_GROUP:
654 	{
655 		struct group_req greq;
656 		struct sockaddr_in6 *psin6;
657 
658 		if (optlen < sizeof(struct group_req))
659 			goto e_inval;
660 
661 		retv = -EFAULT;
662 		if (copy_from_user(&greq, optval, sizeof(struct group_req)))
663 			break;
664 		if (greq.gr_group.ss_family != AF_INET6) {
665 			retv = -EADDRNOTAVAIL;
666 			break;
667 		}
668 		psin6 = (struct sockaddr_in6 *)&greq.gr_group;
669 		if (optname == MCAST_JOIN_GROUP)
670 			retv = ipv6_sock_mc_join(sk, greq.gr_interface,
671 						 &psin6->sin6_addr);
672 		else
673 			retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
674 						 &psin6->sin6_addr);
675 		break;
676 	}
677 	case MCAST_JOIN_SOURCE_GROUP:
678 	case MCAST_LEAVE_SOURCE_GROUP:
679 	case MCAST_BLOCK_SOURCE:
680 	case MCAST_UNBLOCK_SOURCE:
681 	{
682 		struct group_source_req greqs;
683 		int omode, add;
684 
685 		if (optlen < sizeof(struct group_source_req))
686 			goto e_inval;
687 		if (copy_from_user(&greqs, optval, sizeof(greqs))) {
688 			retv = -EFAULT;
689 			break;
690 		}
691 		if (greqs.gsr_group.ss_family != AF_INET6 ||
692 		    greqs.gsr_source.ss_family != AF_INET6) {
693 			retv = -EADDRNOTAVAIL;
694 			break;
695 		}
696 		if (optname == MCAST_BLOCK_SOURCE) {
697 			omode = MCAST_EXCLUDE;
698 			add = 1;
699 		} else if (optname == MCAST_UNBLOCK_SOURCE) {
700 			omode = MCAST_EXCLUDE;
701 			add = 0;
702 		} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
703 			struct sockaddr_in6 *psin6;
704 
705 			psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
706 			retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
707 						 &psin6->sin6_addr);
708 			/* prior join w/ different source is ok */
709 			if (retv && retv != -EADDRINUSE)
710 				break;
711 			omode = MCAST_INCLUDE;
712 			add = 1;
713 		} else /* MCAST_LEAVE_SOURCE_GROUP */ {
714 			omode = MCAST_INCLUDE;
715 			add = 0;
716 		}
717 		retv = ip6_mc_source(add, omode, sk, &greqs);
718 		break;
719 	}
720 	case MCAST_MSFILTER:
721 	{
722 		struct group_filter *gsf;
723 
724 		if (optlen < GROUP_FILTER_SIZE(0))
725 			goto e_inval;
726 		if (optlen > sysctl_optmem_max) {
727 			retv = -ENOBUFS;
728 			break;
729 		}
730 		gsf = kmalloc(optlen, GFP_KERNEL);
731 		if (!gsf) {
732 			retv = -ENOBUFS;
733 			break;
734 		}
735 		retv = -EFAULT;
736 		if (copy_from_user(gsf, optval, optlen)) {
737 			kfree(gsf);
738 			break;
739 		}
740 		/* numsrc >= (4G-140)/128 overflow in 32 bits */
741 		if (gsf->gf_numsrc >= 0x1ffffffU ||
742 		    gsf->gf_numsrc > sysctl_mld_max_msf) {
743 			kfree(gsf);
744 			retv = -ENOBUFS;
745 			break;
746 		}
747 		if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
748 			kfree(gsf);
749 			retv = -EINVAL;
750 			break;
751 		}
752 		retv = ip6_mc_msfilter(sk, gsf);
753 		kfree(gsf);
754 
755 		break;
756 	}
757 	case IPV6_ROUTER_ALERT:
758 		if (optlen < sizeof(int))
759 			goto e_inval;
760 		retv = ip6_ra_control(sk, val);
761 		break;
762 	case IPV6_MTU_DISCOVER:
763 		if (optlen < sizeof(int))
764 			goto e_inval;
765 		if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
766 			goto e_inval;
767 		np->pmtudisc = val;
768 		retv = 0;
769 		break;
770 	case IPV6_MTU:
771 		if (optlen < sizeof(int))
772 			goto e_inval;
773 		if (val && val < IPV6_MIN_MTU)
774 			goto e_inval;
775 		np->frag_size = val;
776 		retv = 0;
777 		break;
778 	case IPV6_RECVERR:
779 		if (optlen < sizeof(int))
780 			goto e_inval;
781 		np->recverr = valbool;
782 		if (!val)
783 			skb_queue_purge(&sk->sk_error_queue);
784 		retv = 0;
785 		break;
786 	case IPV6_FLOWINFO_SEND:
787 		if (optlen < sizeof(int))
788 			goto e_inval;
789 		np->sndflow = valbool;
790 		retv = 0;
791 		break;
792 	case IPV6_FLOWLABEL_MGR:
793 		retv = ipv6_flowlabel_opt(sk, optval, optlen);
794 		break;
795 	case IPV6_IPSEC_POLICY:
796 	case IPV6_XFRM_POLICY:
797 		retv = -EPERM;
798 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
799 			break;
800 		retv = xfrm_user_policy(sk, optname, optval, optlen);
801 		break;
802 
803 	case IPV6_ADDR_PREFERENCES:
804 	    {
805 		unsigned int pref = 0;
806 		unsigned int prefmask = ~0;
807 
808 		if (optlen < sizeof(int))
809 			goto e_inval;
810 
811 		retv = -EINVAL;
812 
813 		/* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
814 		switch (val & (IPV6_PREFER_SRC_PUBLIC|
815 			       IPV6_PREFER_SRC_TMP|
816 			       IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
817 		case IPV6_PREFER_SRC_PUBLIC:
818 			pref |= IPV6_PREFER_SRC_PUBLIC;
819 			break;
820 		case IPV6_PREFER_SRC_TMP:
821 			pref |= IPV6_PREFER_SRC_TMP;
822 			break;
823 		case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
824 			break;
825 		case 0:
826 			goto pref_skip_pubtmp;
827 		default:
828 			goto e_inval;
829 		}
830 
831 		prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
832 			      IPV6_PREFER_SRC_TMP);
833 pref_skip_pubtmp:
834 
835 		/* check HOME/COA conflicts */
836 		switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
837 		case IPV6_PREFER_SRC_HOME:
838 			break;
839 		case IPV6_PREFER_SRC_COA:
840 			pref |= IPV6_PREFER_SRC_COA;
841 		case 0:
842 			goto pref_skip_coa;
843 		default:
844 			goto e_inval;
845 		}
846 
847 		prefmask &= ~IPV6_PREFER_SRC_COA;
848 pref_skip_coa:
849 
850 		/* check CGA/NONCGA conflicts */
851 		switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
852 		case IPV6_PREFER_SRC_CGA:
853 		case IPV6_PREFER_SRC_NONCGA:
854 		case 0:
855 			break;
856 		default:
857 			goto e_inval;
858 		}
859 
860 		np->srcprefs = (np->srcprefs & prefmask) | pref;
861 		retv = 0;
862 
863 		break;
864 	    }
865 	case IPV6_MINHOPCOUNT:
866 		if (optlen < sizeof(int))
867 			goto e_inval;
868 		if (val < 0 || val > 255)
869 			goto e_inval;
870 		np->min_hopcount = val;
871 		retv = 0;
872 		break;
873 	case IPV6_DONTFRAG:
874 		np->dontfrag = valbool;
875 		retv = 0;
876 		break;
877 	case IPV6_AUTOFLOWLABEL:
878 		np->autoflowlabel = valbool;
879 		retv = 0;
880 		break;
881 	case IPV6_RECVFRAGSIZE:
882 		np->rxopt.bits.recvfragsize = valbool;
883 		retv = 0;
884 		break;
885 	}
886 
887 	release_sock(sk);
888 	if (needs_rtnl)
889 		rtnl_unlock();
890 
891 	return retv;
892 
893 e_inval:
894 	release_sock(sk);
895 	if (needs_rtnl)
896 		rtnl_unlock();
897 	return -EINVAL;
898 }
899 
900 int ipv6_setsockopt(struct sock *sk, int level, int optname,
901 		    char __user *optval, unsigned int optlen)
902 {
903 	int err;
904 
905 	if (level == SOL_IP && sk->sk_type != SOCK_RAW)
906 		return udp_prot.setsockopt(sk, level, optname, optval, optlen);
907 
908 	if (level != SOL_IPV6)
909 		return -ENOPROTOOPT;
910 
911 	err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
912 #ifdef CONFIG_NETFILTER
913 	/* we need to exclude all possible ENOPROTOOPTs except default case */
914 	if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
915 			optname != IPV6_XFRM_POLICY) {
916 		lock_sock(sk);
917 		err = nf_setsockopt(sk, PF_INET6, optname, optval,
918 				optlen);
919 		release_sock(sk);
920 	}
921 #endif
922 	return err;
923 }
924 EXPORT_SYMBOL(ipv6_setsockopt);
925 
926 #ifdef CONFIG_COMPAT
927 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
928 			   char __user *optval, unsigned int optlen)
929 {
930 	int err;
931 
932 	if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
933 		if (udp_prot.compat_setsockopt != NULL)
934 			return udp_prot.compat_setsockopt(sk, level, optname,
935 							  optval, optlen);
936 		return udp_prot.setsockopt(sk, level, optname, optval, optlen);
937 	}
938 
939 	if (level != SOL_IPV6)
940 		return -ENOPROTOOPT;
941 
942 	if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
943 		return compat_mc_setsockopt(sk, level, optname, optval, optlen,
944 			ipv6_setsockopt);
945 
946 	err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
947 #ifdef CONFIG_NETFILTER
948 	/* we need to exclude all possible ENOPROTOOPTs except default case */
949 	if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
950 	    optname != IPV6_XFRM_POLICY) {
951 		lock_sock(sk);
952 		err = compat_nf_setsockopt(sk, PF_INET6, optname,
953 					   optval, optlen);
954 		release_sock(sk);
955 	}
956 #endif
957 	return err;
958 }
959 EXPORT_SYMBOL(compat_ipv6_setsockopt);
960 #endif
961 
962 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
963 				  int optname, char __user *optval, int len)
964 {
965 	struct ipv6_opt_hdr *hdr;
966 
967 	if (!opt)
968 		return 0;
969 
970 	switch (optname) {
971 	case IPV6_HOPOPTS:
972 		hdr = opt->hopopt;
973 		break;
974 	case IPV6_RTHDRDSTOPTS:
975 		hdr = opt->dst0opt;
976 		break;
977 	case IPV6_RTHDR:
978 		hdr = (struct ipv6_opt_hdr *)opt->srcrt;
979 		break;
980 	case IPV6_DSTOPTS:
981 		hdr = opt->dst1opt;
982 		break;
983 	default:
984 		return -EINVAL;	/* should not happen */
985 	}
986 
987 	if (!hdr)
988 		return 0;
989 
990 	len = min_t(unsigned int, len, ipv6_optlen(hdr));
991 	if (copy_to_user(optval, hdr, len))
992 		return -EFAULT;
993 	return len;
994 }
995 
996 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
997 		    char __user *optval, int __user *optlen, unsigned int flags)
998 {
999 	struct ipv6_pinfo *np = inet6_sk(sk);
1000 	int len;
1001 	int val;
1002 
1003 	if (ip6_mroute_opt(optname))
1004 		return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1005 
1006 	if (get_user(len, optlen))
1007 		return -EFAULT;
1008 	switch (optname) {
1009 	case IPV6_ADDRFORM:
1010 		if (sk->sk_protocol != IPPROTO_UDP &&
1011 		    sk->sk_protocol != IPPROTO_UDPLITE &&
1012 		    sk->sk_protocol != IPPROTO_TCP)
1013 			return -ENOPROTOOPT;
1014 		if (sk->sk_state != TCP_ESTABLISHED)
1015 			return -ENOTCONN;
1016 		val = sk->sk_family;
1017 		break;
1018 	case MCAST_MSFILTER:
1019 	{
1020 		struct group_filter gsf;
1021 		int err;
1022 
1023 		if (len < GROUP_FILTER_SIZE(0))
1024 			return -EINVAL;
1025 		if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1026 			return -EFAULT;
1027 		if (gsf.gf_group.ss_family != AF_INET6)
1028 			return -EADDRNOTAVAIL;
1029 		lock_sock(sk);
1030 		err = ip6_mc_msfget(sk, &gsf,
1031 			(struct group_filter __user *)optval, optlen);
1032 		release_sock(sk);
1033 		return err;
1034 	}
1035 
1036 	case IPV6_2292PKTOPTIONS:
1037 	{
1038 		struct msghdr msg;
1039 		struct sk_buff *skb;
1040 
1041 		if (sk->sk_type != SOCK_STREAM)
1042 			return -ENOPROTOOPT;
1043 
1044 		msg.msg_control = optval;
1045 		msg.msg_controllen = len;
1046 		msg.msg_flags = flags;
1047 
1048 		lock_sock(sk);
1049 		skb = np->pktoptions;
1050 		if (skb)
1051 			ip6_datagram_recv_ctl(sk, &msg, skb);
1052 		release_sock(sk);
1053 		if (!skb) {
1054 			if (np->rxopt.bits.rxinfo) {
1055 				struct in6_pktinfo src_info;
1056 				src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1057 					np->sticky_pktinfo.ipi6_ifindex;
1058 				src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1059 				put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1060 			}
1061 			if (np->rxopt.bits.rxhlim) {
1062 				int hlim = np->mcast_hops;
1063 				put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1064 			}
1065 			if (np->rxopt.bits.rxtclass) {
1066 				int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1067 
1068 				put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1069 			}
1070 			if (np->rxopt.bits.rxoinfo) {
1071 				struct in6_pktinfo src_info;
1072 				src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1073 					np->sticky_pktinfo.ipi6_ifindex;
1074 				src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1075 								     np->sticky_pktinfo.ipi6_addr;
1076 				put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1077 			}
1078 			if (np->rxopt.bits.rxohlim) {
1079 				int hlim = np->mcast_hops;
1080 				put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1081 			}
1082 			if (np->rxopt.bits.rxflow) {
1083 				__be32 flowinfo = np->rcv_flowinfo;
1084 
1085 				put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1086 			}
1087 		}
1088 		len -= msg.msg_controllen;
1089 		return put_user(len, optlen);
1090 	}
1091 	case IPV6_MTU:
1092 	{
1093 		struct dst_entry *dst;
1094 
1095 		val = 0;
1096 		rcu_read_lock();
1097 		dst = __sk_dst_get(sk);
1098 		if (dst)
1099 			val = dst_mtu(dst);
1100 		rcu_read_unlock();
1101 		if (!val)
1102 			return -ENOTCONN;
1103 		break;
1104 	}
1105 
1106 	case IPV6_V6ONLY:
1107 		val = sk->sk_ipv6only;
1108 		break;
1109 
1110 	case IPV6_RECVPKTINFO:
1111 		val = np->rxopt.bits.rxinfo;
1112 		break;
1113 
1114 	case IPV6_2292PKTINFO:
1115 		val = np->rxopt.bits.rxoinfo;
1116 		break;
1117 
1118 	case IPV6_RECVHOPLIMIT:
1119 		val = np->rxopt.bits.rxhlim;
1120 		break;
1121 
1122 	case IPV6_2292HOPLIMIT:
1123 		val = np->rxopt.bits.rxohlim;
1124 		break;
1125 
1126 	case IPV6_RECVRTHDR:
1127 		val = np->rxopt.bits.srcrt;
1128 		break;
1129 
1130 	case IPV6_2292RTHDR:
1131 		val = np->rxopt.bits.osrcrt;
1132 		break;
1133 
1134 	case IPV6_HOPOPTS:
1135 	case IPV6_RTHDRDSTOPTS:
1136 	case IPV6_RTHDR:
1137 	case IPV6_DSTOPTS:
1138 	{
1139 		struct ipv6_txoptions *opt;
1140 
1141 		lock_sock(sk);
1142 		opt = rcu_dereference_protected(np->opt,
1143 						lockdep_sock_is_held(sk));
1144 		len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1145 		release_sock(sk);
1146 		/* check if ipv6_getsockopt_sticky() returns err code */
1147 		if (len < 0)
1148 			return len;
1149 		return put_user(len, optlen);
1150 	}
1151 
1152 	case IPV6_RECVHOPOPTS:
1153 		val = np->rxopt.bits.hopopts;
1154 		break;
1155 
1156 	case IPV6_2292HOPOPTS:
1157 		val = np->rxopt.bits.ohopopts;
1158 		break;
1159 
1160 	case IPV6_RECVDSTOPTS:
1161 		val = np->rxopt.bits.dstopts;
1162 		break;
1163 
1164 	case IPV6_2292DSTOPTS:
1165 		val = np->rxopt.bits.odstopts;
1166 		break;
1167 
1168 	case IPV6_TCLASS:
1169 		val = np->tclass;
1170 		break;
1171 
1172 	case IPV6_RECVTCLASS:
1173 		val = np->rxopt.bits.rxtclass;
1174 		break;
1175 
1176 	case IPV6_FLOWINFO:
1177 		val = np->rxopt.bits.rxflow;
1178 		break;
1179 
1180 	case IPV6_RECVPATHMTU:
1181 		val = np->rxopt.bits.rxpmtu;
1182 		break;
1183 
1184 	case IPV6_PATHMTU:
1185 	{
1186 		struct dst_entry *dst;
1187 		struct ip6_mtuinfo mtuinfo;
1188 
1189 		if (len < sizeof(mtuinfo))
1190 			return -EINVAL;
1191 
1192 		len = sizeof(mtuinfo);
1193 		memset(&mtuinfo, 0, sizeof(mtuinfo));
1194 
1195 		rcu_read_lock();
1196 		dst = __sk_dst_get(sk);
1197 		if (dst)
1198 			mtuinfo.ip6m_mtu = dst_mtu(dst);
1199 		rcu_read_unlock();
1200 		if (!mtuinfo.ip6m_mtu)
1201 			return -ENOTCONN;
1202 
1203 		if (put_user(len, optlen))
1204 			return -EFAULT;
1205 		if (copy_to_user(optval, &mtuinfo, len))
1206 			return -EFAULT;
1207 
1208 		return 0;
1209 	}
1210 
1211 	case IPV6_TRANSPARENT:
1212 		val = inet_sk(sk)->transparent;
1213 		break;
1214 
1215 	case IPV6_RECVORIGDSTADDR:
1216 		val = np->rxopt.bits.rxorigdstaddr;
1217 		break;
1218 
1219 	case IPV6_UNICAST_HOPS:
1220 	case IPV6_MULTICAST_HOPS:
1221 	{
1222 		struct dst_entry *dst;
1223 
1224 		if (optname == IPV6_UNICAST_HOPS)
1225 			val = np->hop_limit;
1226 		else
1227 			val = np->mcast_hops;
1228 
1229 		if (val < 0) {
1230 			rcu_read_lock();
1231 			dst = __sk_dst_get(sk);
1232 			if (dst)
1233 				val = ip6_dst_hoplimit(dst);
1234 			rcu_read_unlock();
1235 		}
1236 
1237 		if (val < 0)
1238 			val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1239 		break;
1240 	}
1241 
1242 	case IPV6_MULTICAST_LOOP:
1243 		val = np->mc_loop;
1244 		break;
1245 
1246 	case IPV6_MULTICAST_IF:
1247 		val = np->mcast_oif;
1248 		break;
1249 
1250 	case IPV6_UNICAST_IF:
1251 		val = (__force int)htonl((__u32) np->ucast_oif);
1252 		break;
1253 
1254 	case IPV6_MTU_DISCOVER:
1255 		val = np->pmtudisc;
1256 		break;
1257 
1258 	case IPV6_RECVERR:
1259 		val = np->recverr;
1260 		break;
1261 
1262 	case IPV6_FLOWINFO_SEND:
1263 		val = np->sndflow;
1264 		break;
1265 
1266 	case IPV6_FLOWLABEL_MGR:
1267 	{
1268 		struct in6_flowlabel_req freq;
1269 		int flags;
1270 
1271 		if (len < sizeof(freq))
1272 			return -EINVAL;
1273 
1274 		if (copy_from_user(&freq, optval, sizeof(freq)))
1275 			return -EFAULT;
1276 
1277 		if (freq.flr_action != IPV6_FL_A_GET)
1278 			return -EINVAL;
1279 
1280 		len = sizeof(freq);
1281 		flags = freq.flr_flags;
1282 
1283 		memset(&freq, 0, sizeof(freq));
1284 
1285 		val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1286 		if (val < 0)
1287 			return val;
1288 
1289 		if (put_user(len, optlen))
1290 			return -EFAULT;
1291 		if (copy_to_user(optval, &freq, len))
1292 			return -EFAULT;
1293 
1294 		return 0;
1295 	}
1296 
1297 	case IPV6_ADDR_PREFERENCES:
1298 		val = 0;
1299 
1300 		if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1301 			val |= IPV6_PREFER_SRC_TMP;
1302 		else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1303 			val |= IPV6_PREFER_SRC_PUBLIC;
1304 		else {
1305 			/* XXX: should we return system default? */
1306 			val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1307 		}
1308 
1309 		if (np->srcprefs & IPV6_PREFER_SRC_COA)
1310 			val |= IPV6_PREFER_SRC_COA;
1311 		else
1312 			val |= IPV6_PREFER_SRC_HOME;
1313 		break;
1314 
1315 	case IPV6_MINHOPCOUNT:
1316 		val = np->min_hopcount;
1317 		break;
1318 
1319 	case IPV6_DONTFRAG:
1320 		val = np->dontfrag;
1321 		break;
1322 
1323 	case IPV6_AUTOFLOWLABEL:
1324 		val = np->autoflowlabel;
1325 		break;
1326 
1327 	case IPV6_RECVFRAGSIZE:
1328 		val = np->rxopt.bits.recvfragsize;
1329 		break;
1330 
1331 	default:
1332 		return -ENOPROTOOPT;
1333 	}
1334 	len = min_t(unsigned int, sizeof(int), len);
1335 	if (put_user(len, optlen))
1336 		return -EFAULT;
1337 	if (copy_to_user(optval, &val, len))
1338 		return -EFAULT;
1339 	return 0;
1340 }
1341 
1342 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1343 		    char __user *optval, int __user *optlen)
1344 {
1345 	int err;
1346 
1347 	if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1348 		return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1349 
1350 	if (level != SOL_IPV6)
1351 		return -ENOPROTOOPT;
1352 
1353 	err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1354 #ifdef CONFIG_NETFILTER
1355 	/* we need to exclude all possible ENOPROTOOPTs except default case */
1356 	if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1357 		int len;
1358 
1359 		if (get_user(len, optlen))
1360 			return -EFAULT;
1361 
1362 		lock_sock(sk);
1363 		err = nf_getsockopt(sk, PF_INET6, optname, optval,
1364 				&len);
1365 		release_sock(sk);
1366 		if (err >= 0)
1367 			err = put_user(len, optlen);
1368 	}
1369 #endif
1370 	return err;
1371 }
1372 EXPORT_SYMBOL(ipv6_getsockopt);
1373 
1374 #ifdef CONFIG_COMPAT
1375 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1376 			   char __user *optval, int __user *optlen)
1377 {
1378 	int err;
1379 
1380 	if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1381 		if (udp_prot.compat_getsockopt != NULL)
1382 			return udp_prot.compat_getsockopt(sk, level, optname,
1383 							  optval, optlen);
1384 		return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1385 	}
1386 
1387 	if (level != SOL_IPV6)
1388 		return -ENOPROTOOPT;
1389 
1390 	if (optname == MCAST_MSFILTER)
1391 		return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1392 			ipv6_getsockopt);
1393 
1394 	err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1395 				 MSG_CMSG_COMPAT);
1396 #ifdef CONFIG_NETFILTER
1397 	/* we need to exclude all possible ENOPROTOOPTs except default case */
1398 	if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1399 		int len;
1400 
1401 		if (get_user(len, optlen))
1402 			return -EFAULT;
1403 
1404 		lock_sock(sk);
1405 		err = compat_nf_getsockopt(sk, PF_INET6,
1406 					   optname, optval, &len);
1407 		release_sock(sk);
1408 		if (err >= 0)
1409 			err = put_user(len, optlen);
1410 	}
1411 #endif
1412 	return err;
1413 }
1414 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1415 #endif
1416 
1417