net-ipv6: IPV6_TRANSPARENT - check NET_RAW prior to NET_ADMIN
[muen/linux.git] / net / ipv6 / ipv6_sockglue.c
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
55 struct ip6_ra_chain *ip6_ra_chain;
56 DEFINE_RWLOCK(ip6_ra_lock);
57
58 int ip6_ra_control(struct sock *sk, int sel)
59 {
60         struct ip6_ra_chain *ra, *new_ra, **rap;
61
62         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
63         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
64                 return -ENOPROTOOPT;
65
66         new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
67         if (sel >= 0 && !new_ra)
68                 return -ENOMEM;
69
70         write_lock_bh(&ip6_ra_lock);
71         for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
72                 if (ra->sk == sk) {
73                         if (sel >= 0) {
74                                 write_unlock_bh(&ip6_ra_lock);
75                                 kfree(new_ra);
76                                 return -EADDRINUSE;
77                         }
78
79                         *rap = ra->next;
80                         write_unlock_bh(&ip6_ra_lock);
81
82                         sock_put(sk);
83                         kfree(ra);
84                         return 0;
85                 }
86         }
87         if (!new_ra) {
88                 write_unlock_bh(&ip6_ra_lock);
89                 return -ENOBUFS;
90         }
91         new_ra->sk = sk;
92         new_ra->sel = sel;
93         new_ra->next = ra;
94         *rap = new_ra;
95         sock_hold(sk);
96         write_unlock_bh(&ip6_ra_lock);
97         return 0;
98 }
99
100 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
101                                            struct ipv6_txoptions *opt)
102 {
103         if (inet_sk(sk)->is_icsk) {
104                 if (opt &&
105                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
106                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
107                         struct inet_connection_sock *icsk = inet_csk(sk);
108                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
109                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
110                 }
111         }
112         opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
113                    opt);
114         sk_dst_reset(sk);
115
116         return opt;
117 }
118
119 static bool setsockopt_needs_rtnl(int optname)
120 {
121         switch (optname) {
122         case IPV6_ADDRFORM:
123         case IPV6_ADD_MEMBERSHIP:
124         case IPV6_DROP_MEMBERSHIP:
125         case IPV6_JOIN_ANYCAST:
126         case IPV6_LEAVE_ANYCAST:
127         case MCAST_JOIN_GROUP:
128         case MCAST_LEAVE_GROUP:
129         case MCAST_JOIN_SOURCE_GROUP:
130         case MCAST_LEAVE_SOURCE_GROUP:
131         case MCAST_BLOCK_SOURCE:
132         case MCAST_UNBLOCK_SOURCE:
133         case MCAST_MSFILTER:
134                 return true;
135         }
136         return false;
137 }
138
139 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
140                     char __user *optval, unsigned int optlen)
141 {
142         struct ipv6_pinfo *np = inet6_sk(sk);
143         struct net *net = sock_net(sk);
144         int val, valbool;
145         int retv = -ENOPROTOOPT;
146         bool needs_rtnl = setsockopt_needs_rtnl(optname);
147
148         if (!optval)
149                 val = 0;
150         else {
151                 if (optlen >= sizeof(int)) {
152                         if (get_user(val, (int __user *) optval))
153                                 return -EFAULT;
154                 } else
155                         val = 0;
156         }
157
158         valbool = (val != 0);
159
160         if (ip6_mroute_opt(optname))
161                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
162
163         if (needs_rtnl)
164                 rtnl_lock();
165         lock_sock(sk);
166
167         switch (optname) {
168
169         case IPV6_ADDRFORM:
170                 if (optlen < sizeof(int))
171                         goto e_inval;
172                 if (val == PF_INET) {
173                         struct ipv6_txoptions *opt;
174                         struct sk_buff *pktopt;
175
176                         if (sk->sk_type == SOCK_RAW)
177                                 break;
178
179                         if (sk->sk_protocol == IPPROTO_UDP ||
180                             sk->sk_protocol == IPPROTO_UDPLITE) {
181                                 struct udp_sock *up = udp_sk(sk);
182                                 if (up->pending == AF_INET6) {
183                                         retv = -EBUSY;
184                                         break;
185                                 }
186                         } else if (sk->sk_protocol != IPPROTO_TCP)
187                                 break;
188
189                         if (sk->sk_state != TCP_ESTABLISHED) {
190                                 retv = -ENOTCONN;
191                                 break;
192                         }
193
194                         if (ipv6_only_sock(sk) ||
195                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
196                                 retv = -EADDRNOTAVAIL;
197                                 break;
198                         }
199
200                         fl6_free_socklist(sk);
201                         __ipv6_sock_mc_close(sk);
202
203                         /*
204                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
205                          * remove it from the refcnt debug socks count in the
206                          * original family...
207                          */
208                         sk_refcnt_debug_dec(sk);
209
210                         if (sk->sk_protocol == IPPROTO_TCP) {
211                                 struct inet_connection_sock *icsk = inet_csk(sk);
212                                 local_bh_disable();
213                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
214                                 sock_prot_inuse_add(net, &tcp_prot, 1);
215                                 local_bh_enable();
216                                 sk->sk_prot = &tcp_prot;
217                                 icsk->icsk_af_ops = &ipv4_specific;
218                                 sk->sk_socket->ops = &inet_stream_ops;
219                                 sk->sk_family = PF_INET;
220                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
221                         } else {
222                                 struct proto *prot = &udp_prot;
223
224                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
225                                         prot = &udplite_prot;
226                                 local_bh_disable();
227                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
228                                 sock_prot_inuse_add(net, prot, 1);
229                                 local_bh_enable();
230                                 sk->sk_prot = prot;
231                                 sk->sk_socket->ops = &inet_dgram_ops;
232                                 sk->sk_family = PF_INET;
233                         }
234                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
235                                    NULL);
236                         if (opt) {
237                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
238                                 txopt_put(opt);
239                         }
240                         pktopt = xchg(&np->pktoptions, NULL);
241                         kfree_skb(pktopt);
242
243                         /*
244                          * ... and add it to the refcnt debug socks count
245                          * in the new family. -acme
246                          */
247                         sk_refcnt_debug_inc(sk);
248                         module_put(THIS_MODULE);
249                         retv = 0;
250                         break;
251                 }
252                 goto e_inval;
253
254         case IPV6_V6ONLY:
255                 if (optlen < sizeof(int) ||
256                     inet_sk(sk)->inet_num)
257                         goto e_inval;
258                 sk->sk_ipv6only = valbool;
259                 retv = 0;
260                 break;
261
262         case IPV6_RECVPKTINFO:
263                 if (optlen < sizeof(int))
264                         goto e_inval;
265                 np->rxopt.bits.rxinfo = valbool;
266                 retv = 0;
267                 break;
268
269         case IPV6_2292PKTINFO:
270                 if (optlen < sizeof(int))
271                         goto e_inval;
272                 np->rxopt.bits.rxoinfo = valbool;
273                 retv = 0;
274                 break;
275
276         case IPV6_RECVHOPLIMIT:
277                 if (optlen < sizeof(int))
278                         goto e_inval;
279                 np->rxopt.bits.rxhlim = valbool;
280                 retv = 0;
281                 break;
282
283         case IPV6_2292HOPLIMIT:
284                 if (optlen < sizeof(int))
285                         goto e_inval;
286                 np->rxopt.bits.rxohlim = valbool;
287                 retv = 0;
288                 break;
289
290         case IPV6_RECVRTHDR:
291                 if (optlen < sizeof(int))
292                         goto e_inval;
293                 np->rxopt.bits.srcrt = valbool;
294                 retv = 0;
295                 break;
296
297         case IPV6_2292RTHDR:
298                 if (optlen < sizeof(int))
299                         goto e_inval;
300                 np->rxopt.bits.osrcrt = valbool;
301                 retv = 0;
302                 break;
303
304         case IPV6_RECVHOPOPTS:
305                 if (optlen < sizeof(int))
306                         goto e_inval;
307                 np->rxopt.bits.hopopts = valbool;
308                 retv = 0;
309                 break;
310
311         case IPV6_2292HOPOPTS:
312                 if (optlen < sizeof(int))
313                         goto e_inval;
314                 np->rxopt.bits.ohopopts = valbool;
315                 retv = 0;
316                 break;
317
318         case IPV6_RECVDSTOPTS:
319                 if (optlen < sizeof(int))
320                         goto e_inval;
321                 np->rxopt.bits.dstopts = valbool;
322                 retv = 0;
323                 break;
324
325         case IPV6_2292DSTOPTS:
326                 if (optlen < sizeof(int))
327                         goto e_inval;
328                 np->rxopt.bits.odstopts = valbool;
329                 retv = 0;
330                 break;
331
332         case IPV6_TCLASS:
333                 if (optlen < sizeof(int))
334                         goto e_inval;
335                 if (val < -1 || val > 0xff)
336                         goto e_inval;
337                 /* RFC 3542, 6.5: default traffic class of 0x0 */
338                 if (val == -1)
339                         val = 0;
340                 np->tclass = val;
341                 retv = 0;
342                 break;
343
344         case IPV6_RECVTCLASS:
345                 if (optlen < sizeof(int))
346                         goto e_inval;
347                 np->rxopt.bits.rxtclass = valbool;
348                 retv = 0;
349                 break;
350
351         case IPV6_FLOWINFO:
352                 if (optlen < sizeof(int))
353                         goto e_inval;
354                 np->rxopt.bits.rxflow = valbool;
355                 retv = 0;
356                 break;
357
358         case IPV6_RECVPATHMTU:
359                 if (optlen < sizeof(int))
360                         goto e_inval;
361                 np->rxopt.bits.rxpmtu = valbool;
362                 retv = 0;
363                 break;
364
365         case IPV6_TRANSPARENT:
366                 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
367                     !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
368                         retv = -EPERM;
369                         break;
370                 }
371                 if (optlen < sizeof(int))
372                         goto e_inval;
373                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
374                 inet_sk(sk)->transparent = valbool;
375                 retv = 0;
376                 break;
377
378         case IPV6_FREEBIND:
379                 if (optlen < sizeof(int))
380                         goto e_inval;
381                 /* we also don't have a separate freebind bit for IPV6 */
382                 inet_sk(sk)->freebind = valbool;
383                 retv = 0;
384                 break;
385
386         case IPV6_RECVORIGDSTADDR:
387                 if (optlen < sizeof(int))
388                         goto e_inval;
389                 np->rxopt.bits.rxorigdstaddr = valbool;
390                 retv = 0;
391                 break;
392
393         case IPV6_HOPOPTS:
394         case IPV6_RTHDRDSTOPTS:
395         case IPV6_RTHDR:
396         case IPV6_DSTOPTS:
397         {
398                 struct ipv6_txoptions *opt;
399                 struct ipv6_opt_hdr *new = NULL;
400
401                 /* hop-by-hop / destination options are privileged option */
402                 retv = -EPERM;
403                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
404                         break;
405
406                 /* remove any sticky options header with a zero option
407                  * length, per RFC3542.
408                  */
409                 if (optlen == 0)
410                         optval = NULL;
411                 else if (!optval)
412                         goto e_inval;
413                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
414                          optlen & 0x7 || optlen > 8 * 255)
415                         goto e_inval;
416                 else {
417                         new = memdup_user(optval, optlen);
418                         if (IS_ERR(new)) {
419                                 retv = PTR_ERR(new);
420                                 break;
421                         }
422                         if (unlikely(ipv6_optlen(new) > optlen)) {
423                                 kfree(new);
424                                 goto e_inval;
425                         }
426                 }
427
428                 opt = rcu_dereference_protected(np->opt,
429                                                 lockdep_sock_is_held(sk));
430                 opt = ipv6_renew_options(sk, opt, optname, new);
431                 kfree(new);
432                 if (IS_ERR(opt)) {
433                         retv = PTR_ERR(opt);
434                         break;
435                 }
436
437                 /* routing header option needs extra check */
438                 retv = -EINVAL;
439                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
440                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
441                         switch (rthdr->type) {
442 #if IS_ENABLED(CONFIG_IPV6_MIP6)
443                         case IPV6_SRCRT_TYPE_2:
444                                 if (rthdr->hdrlen != 2 ||
445                                     rthdr->segments_left != 1)
446                                         goto sticky_done;
447
448                                 break;
449 #endif
450                         case IPV6_SRCRT_TYPE_4:
451                         {
452                                 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
453                                                           opt->srcrt;
454
455                                 if (!seg6_validate_srh(srh, optlen))
456                                         goto sticky_done;
457                                 break;
458                         }
459                         default:
460                                 goto sticky_done;
461                         }
462                 }
463
464                 retv = 0;
465                 opt = ipv6_update_options(sk, opt);
466 sticky_done:
467                 if (opt) {
468                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
469                         txopt_put(opt);
470                 }
471                 break;
472         }
473
474         case IPV6_PKTINFO:
475         {
476                 struct in6_pktinfo pkt;
477
478                 if (optlen == 0)
479                         goto e_inval;
480                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
481                         goto e_inval;
482
483                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
484                                 retv = -EFAULT;
485                                 break;
486                 }
487                 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
488                         goto e_inval;
489
490                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
491                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
492                 retv = 0;
493                 break;
494         }
495
496         case IPV6_2292PKTOPTIONS:
497         {
498                 struct ipv6_txoptions *opt = NULL;
499                 struct msghdr msg;
500                 struct flowi6 fl6;
501                 struct ipcm6_cookie ipc6;
502
503                 memset(&fl6, 0, sizeof(fl6));
504                 fl6.flowi6_oif = sk->sk_bound_dev_if;
505                 fl6.flowi6_mark = sk->sk_mark;
506
507                 if (optlen == 0)
508                         goto update;
509
510                 /* 1K is probably excessive
511                  * 1K is surely not enough, 2K per standard header is 16K.
512                  */
513                 retv = -EINVAL;
514                 if (optlen > 64*1024)
515                         break;
516
517                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
518                 retv = -ENOBUFS;
519                 if (!opt)
520                         break;
521
522                 memset(opt, 0, sizeof(*opt));
523                 refcount_set(&opt->refcnt, 1);
524                 opt->tot_len = sizeof(*opt) + optlen;
525                 retv = -EFAULT;
526                 if (copy_from_user(opt+1, optval, optlen))
527                         goto done;
528
529                 msg.msg_controllen = optlen;
530                 msg.msg_control = (void *)(opt+1);
531                 ipc6.opt = opt;
532
533                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
534                 if (retv)
535                         goto done;
536 update:
537                 retv = 0;
538                 opt = ipv6_update_options(sk, opt);
539 done:
540                 if (opt) {
541                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
542                         txopt_put(opt);
543                 }
544                 break;
545         }
546         case IPV6_UNICAST_HOPS:
547                 if (optlen < sizeof(int))
548                         goto e_inval;
549                 if (val > 255 || val < -1)
550                         goto e_inval;
551                 np->hop_limit = val;
552                 retv = 0;
553                 break;
554
555         case IPV6_MULTICAST_HOPS:
556                 if (sk->sk_type == SOCK_STREAM)
557                         break;
558                 if (optlen < sizeof(int))
559                         goto e_inval;
560                 if (val > 255 || val < -1)
561                         goto e_inval;
562                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
563                 retv = 0;
564                 break;
565
566         case IPV6_MULTICAST_LOOP:
567                 if (optlen < sizeof(int))
568                         goto e_inval;
569                 if (val != valbool)
570                         goto e_inval;
571                 np->mc_loop = valbool;
572                 retv = 0;
573                 break;
574
575         case IPV6_UNICAST_IF:
576         {
577                 struct net_device *dev = NULL;
578                 int ifindex;
579
580                 if (optlen != sizeof(int))
581                         goto e_inval;
582
583                 ifindex = (__force int)ntohl((__force __be32)val);
584                 if (ifindex == 0) {
585                         np->ucast_oif = 0;
586                         retv = 0;
587                         break;
588                 }
589
590                 dev = dev_get_by_index(net, ifindex);
591                 retv = -EADDRNOTAVAIL;
592                 if (!dev)
593                         break;
594                 dev_put(dev);
595
596                 retv = -EINVAL;
597                 if (sk->sk_bound_dev_if)
598                         break;
599
600                 np->ucast_oif = ifindex;
601                 retv = 0;
602                 break;
603         }
604
605         case IPV6_MULTICAST_IF:
606                 if (sk->sk_type == SOCK_STREAM)
607                         break;
608                 if (optlen < sizeof(int))
609                         goto e_inval;
610
611                 if (val) {
612                         struct net_device *dev;
613                         int midx;
614
615                         rcu_read_lock();
616
617                         dev = dev_get_by_index_rcu(net, val);
618                         if (!dev) {
619                                 rcu_read_unlock();
620                                 retv = -ENODEV;
621                                 break;
622                         }
623                         midx = l3mdev_master_ifindex_rcu(dev);
624
625                         rcu_read_unlock();
626
627                         if (sk->sk_bound_dev_if &&
628                             sk->sk_bound_dev_if != val &&
629                             (!midx || midx != sk->sk_bound_dev_if))
630                                 goto e_inval;
631                 }
632                 np->mcast_oif = val;
633                 retv = 0;
634                 break;
635         case IPV6_ADD_MEMBERSHIP:
636         case IPV6_DROP_MEMBERSHIP:
637         {
638                 struct ipv6_mreq mreq;
639
640                 if (optlen < sizeof(struct ipv6_mreq))
641                         goto e_inval;
642
643                 retv = -EPROTO;
644                 if (inet_sk(sk)->is_icsk)
645                         break;
646
647                 retv = -EFAULT;
648                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
649                         break;
650
651                 if (optname == IPV6_ADD_MEMBERSHIP)
652                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
653                 else
654                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
655                 break;
656         }
657         case IPV6_JOIN_ANYCAST:
658         case IPV6_LEAVE_ANYCAST:
659         {
660                 struct ipv6_mreq mreq;
661
662                 if (optlen < sizeof(struct ipv6_mreq))
663                         goto e_inval;
664
665                 retv = -EFAULT;
666                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
667                         break;
668
669                 if (optname == IPV6_JOIN_ANYCAST)
670                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
671                 else
672                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
673                 break;
674         }
675         case IPV6_MULTICAST_ALL:
676                 if (optlen < sizeof(int))
677                         goto e_inval;
678                 np->mc_all = valbool;
679                 retv = 0;
680                 break;
681
682         case MCAST_JOIN_GROUP:
683         case MCAST_LEAVE_GROUP:
684         {
685                 struct group_req greq;
686                 struct sockaddr_in6 *psin6;
687
688                 if (optlen < sizeof(struct group_req))
689                         goto e_inval;
690
691                 retv = -EFAULT;
692                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
693                         break;
694                 if (greq.gr_group.ss_family != AF_INET6) {
695                         retv = -EADDRNOTAVAIL;
696                         break;
697                 }
698                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
699                 if (optname == MCAST_JOIN_GROUP)
700                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
701                                                  &psin6->sin6_addr);
702                 else
703                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
704                                                  &psin6->sin6_addr);
705                 break;
706         }
707         case MCAST_JOIN_SOURCE_GROUP:
708         case MCAST_LEAVE_SOURCE_GROUP:
709         case MCAST_BLOCK_SOURCE:
710         case MCAST_UNBLOCK_SOURCE:
711         {
712                 struct group_source_req greqs;
713                 int omode, add;
714
715                 if (optlen < sizeof(struct group_source_req))
716                         goto e_inval;
717                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
718                         retv = -EFAULT;
719                         break;
720                 }
721                 if (greqs.gsr_group.ss_family != AF_INET6 ||
722                     greqs.gsr_source.ss_family != AF_INET6) {
723                         retv = -EADDRNOTAVAIL;
724                         break;
725                 }
726                 if (optname == MCAST_BLOCK_SOURCE) {
727                         omode = MCAST_EXCLUDE;
728                         add = 1;
729                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
730                         omode = MCAST_EXCLUDE;
731                         add = 0;
732                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
733                         struct sockaddr_in6 *psin6;
734
735                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
736                         retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
737                                                      &psin6->sin6_addr,
738                                                      MCAST_INCLUDE);
739                         /* prior join w/ different source is ok */
740                         if (retv && retv != -EADDRINUSE)
741                                 break;
742                         omode = MCAST_INCLUDE;
743                         add = 1;
744                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
745                         omode = MCAST_INCLUDE;
746                         add = 0;
747                 }
748                 retv = ip6_mc_source(add, omode, sk, &greqs);
749                 break;
750         }
751         case MCAST_MSFILTER:
752         {
753                 struct group_filter *gsf;
754
755                 if (optlen < GROUP_FILTER_SIZE(0))
756                         goto e_inval;
757                 if (optlen > sysctl_optmem_max) {
758                         retv = -ENOBUFS;
759                         break;
760                 }
761                 gsf = memdup_user(optval, optlen);
762                 if (IS_ERR(gsf)) {
763                         retv = PTR_ERR(gsf);
764                         break;
765                 }
766                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
767                 if (gsf->gf_numsrc >= 0x1ffffffU ||
768                     gsf->gf_numsrc > sysctl_mld_max_msf) {
769                         kfree(gsf);
770                         retv = -ENOBUFS;
771                         break;
772                 }
773                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
774                         kfree(gsf);
775                         retv = -EINVAL;
776                         break;
777                 }
778                 retv = ip6_mc_msfilter(sk, gsf);
779                 kfree(gsf);
780
781                 break;
782         }
783         case IPV6_ROUTER_ALERT:
784                 if (optlen < sizeof(int))
785                         goto e_inval;
786                 retv = ip6_ra_control(sk, val);
787                 break;
788         case IPV6_ROUTER_ALERT_ISOLATE:
789                 if (optlen < sizeof(int))
790                         goto e_inval;
791                 np->rtalert_isolate = valbool;
792                 retv = 0;
793                 break;
794         case IPV6_MTU_DISCOVER:
795                 if (optlen < sizeof(int))
796                         goto e_inval;
797                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
798                         goto e_inval;
799                 np->pmtudisc = val;
800                 retv = 0;
801                 break;
802         case IPV6_MTU:
803                 if (optlen < sizeof(int))
804                         goto e_inval;
805                 if (val && val < IPV6_MIN_MTU)
806                         goto e_inval;
807                 np->frag_size = val;
808                 retv = 0;
809                 break;
810         case IPV6_RECVERR:
811                 if (optlen < sizeof(int))
812                         goto e_inval;
813                 np->recverr = valbool;
814                 if (!val)
815                         skb_queue_purge(&sk->sk_error_queue);
816                 retv = 0;
817                 break;
818         case IPV6_FLOWINFO_SEND:
819                 if (optlen < sizeof(int))
820                         goto e_inval;
821                 np->sndflow = valbool;
822                 retv = 0;
823                 break;
824         case IPV6_FLOWLABEL_MGR:
825                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
826                 break;
827         case IPV6_IPSEC_POLICY:
828         case IPV6_XFRM_POLICY:
829                 retv = -EPERM;
830                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
831                         break;
832                 retv = xfrm_user_policy(sk, optname, optval, optlen);
833                 break;
834
835         case IPV6_ADDR_PREFERENCES:
836             {
837                 unsigned int pref = 0;
838                 unsigned int prefmask = ~0;
839
840                 if (optlen < sizeof(int))
841                         goto e_inval;
842
843                 retv = -EINVAL;
844
845                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
846                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
847                                IPV6_PREFER_SRC_TMP|
848                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
849                 case IPV6_PREFER_SRC_PUBLIC:
850                         pref |= IPV6_PREFER_SRC_PUBLIC;
851                         break;
852                 case IPV6_PREFER_SRC_TMP:
853                         pref |= IPV6_PREFER_SRC_TMP;
854                         break;
855                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
856                         break;
857                 case 0:
858                         goto pref_skip_pubtmp;
859                 default:
860                         goto e_inval;
861                 }
862
863                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
864                               IPV6_PREFER_SRC_TMP);
865 pref_skip_pubtmp:
866
867                 /* check HOME/COA conflicts */
868                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
869                 case IPV6_PREFER_SRC_HOME:
870                         break;
871                 case IPV6_PREFER_SRC_COA:
872                         pref |= IPV6_PREFER_SRC_COA;
873                 case 0:
874                         goto pref_skip_coa;
875                 default:
876                         goto e_inval;
877                 }
878
879                 prefmask &= ~IPV6_PREFER_SRC_COA;
880 pref_skip_coa:
881
882                 /* check CGA/NONCGA conflicts */
883                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
884                 case IPV6_PREFER_SRC_CGA:
885                 case IPV6_PREFER_SRC_NONCGA:
886                 case 0:
887                         break;
888                 default:
889                         goto e_inval;
890                 }
891
892                 np->srcprefs = (np->srcprefs & prefmask) | pref;
893                 retv = 0;
894
895                 break;
896             }
897         case IPV6_MINHOPCOUNT:
898                 if (optlen < sizeof(int))
899                         goto e_inval;
900                 if (val < 0 || val > 255)
901                         goto e_inval;
902                 np->min_hopcount = val;
903                 retv = 0;
904                 break;
905         case IPV6_DONTFRAG:
906                 np->dontfrag = valbool;
907                 retv = 0;
908                 break;
909         case IPV6_AUTOFLOWLABEL:
910                 np->autoflowlabel = valbool;
911                 np->autoflowlabel_set = 1;
912                 retv = 0;
913                 break;
914         case IPV6_RECVFRAGSIZE:
915                 np->rxopt.bits.recvfragsize = valbool;
916                 retv = 0;
917                 break;
918         }
919
920         release_sock(sk);
921         if (needs_rtnl)
922                 rtnl_unlock();
923
924         return retv;
925
926 e_inval:
927         release_sock(sk);
928         if (needs_rtnl)
929                 rtnl_unlock();
930         return -EINVAL;
931 }
932
933 int ipv6_setsockopt(struct sock *sk, int level, int optname,
934                     char __user *optval, unsigned int optlen)
935 {
936         int err;
937
938         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
939                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
940
941         if (level != SOL_IPV6)
942                 return -ENOPROTOOPT;
943
944         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
945 #ifdef CONFIG_NETFILTER
946         /* we need to exclude all possible ENOPROTOOPTs except default case */
947         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
948                         optname != IPV6_XFRM_POLICY)
949                 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
950 #endif
951         return err;
952 }
953 EXPORT_SYMBOL(ipv6_setsockopt);
954
955 #ifdef CONFIG_COMPAT
956 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
957                            char __user *optval, unsigned int optlen)
958 {
959         int err;
960
961         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
962                 if (udp_prot.compat_setsockopt != NULL)
963                         return udp_prot.compat_setsockopt(sk, level, optname,
964                                                           optval, optlen);
965                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
966         }
967
968         if (level != SOL_IPV6)
969                 return -ENOPROTOOPT;
970
971         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
972                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
973                         ipv6_setsockopt);
974
975         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
976 #ifdef CONFIG_NETFILTER
977         /* we need to exclude all possible ENOPROTOOPTs except default case */
978         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
979             optname != IPV6_XFRM_POLICY)
980                 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
981                                            optlen);
982 #endif
983         return err;
984 }
985 EXPORT_SYMBOL(compat_ipv6_setsockopt);
986 #endif
987
988 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
989                                   int optname, char __user *optval, int len)
990 {
991         struct ipv6_opt_hdr *hdr;
992
993         if (!opt)
994                 return 0;
995
996         switch (optname) {
997         case IPV6_HOPOPTS:
998                 hdr = opt->hopopt;
999                 break;
1000         case IPV6_RTHDRDSTOPTS:
1001                 hdr = opt->dst0opt;
1002                 break;
1003         case IPV6_RTHDR:
1004                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1005                 break;
1006         case IPV6_DSTOPTS:
1007                 hdr = opt->dst1opt;
1008                 break;
1009         default:
1010                 return -EINVAL; /* should not happen */
1011         }
1012
1013         if (!hdr)
1014                 return 0;
1015
1016         len = min_t(unsigned int, len, ipv6_optlen(hdr));
1017         if (copy_to_user(optval, hdr, len))
1018                 return -EFAULT;
1019         return len;
1020 }
1021
1022 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1023                     char __user *optval, int __user *optlen, unsigned int flags)
1024 {
1025         struct ipv6_pinfo *np = inet6_sk(sk);
1026         int len;
1027         int val;
1028
1029         if (ip6_mroute_opt(optname))
1030                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1031
1032         if (get_user(len, optlen))
1033                 return -EFAULT;
1034         switch (optname) {
1035         case IPV6_ADDRFORM:
1036                 if (sk->sk_protocol != IPPROTO_UDP &&
1037                     sk->sk_protocol != IPPROTO_UDPLITE &&
1038                     sk->sk_protocol != IPPROTO_TCP)
1039                         return -ENOPROTOOPT;
1040                 if (sk->sk_state != TCP_ESTABLISHED)
1041                         return -ENOTCONN;
1042                 val = sk->sk_family;
1043                 break;
1044         case MCAST_MSFILTER:
1045         {
1046                 struct group_filter gsf;
1047                 int err;
1048
1049                 if (len < GROUP_FILTER_SIZE(0))
1050                         return -EINVAL;
1051                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1052                         return -EFAULT;
1053                 if (gsf.gf_group.ss_family != AF_INET6)
1054                         return -EADDRNOTAVAIL;
1055                 lock_sock(sk);
1056                 err = ip6_mc_msfget(sk, &gsf,
1057                         (struct group_filter __user *)optval, optlen);
1058                 release_sock(sk);
1059                 return err;
1060         }
1061
1062         case IPV6_2292PKTOPTIONS:
1063         {
1064                 struct msghdr msg;
1065                 struct sk_buff *skb;
1066
1067                 if (sk->sk_type != SOCK_STREAM)
1068                         return -ENOPROTOOPT;
1069
1070                 msg.msg_control = optval;
1071                 msg.msg_controllen = len;
1072                 msg.msg_flags = flags;
1073
1074                 lock_sock(sk);
1075                 skb = np->pktoptions;
1076                 if (skb)
1077                         ip6_datagram_recv_ctl(sk, &msg, skb);
1078                 release_sock(sk);
1079                 if (!skb) {
1080                         if (np->rxopt.bits.rxinfo) {
1081                                 struct in6_pktinfo src_info;
1082                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1083                                         np->sticky_pktinfo.ipi6_ifindex;
1084                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1085                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1086                         }
1087                         if (np->rxopt.bits.rxhlim) {
1088                                 int hlim = np->mcast_hops;
1089                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1090                         }
1091                         if (np->rxopt.bits.rxtclass) {
1092                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1093
1094                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1095                         }
1096                         if (np->rxopt.bits.rxoinfo) {
1097                                 struct in6_pktinfo src_info;
1098                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1099                                         np->sticky_pktinfo.ipi6_ifindex;
1100                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1101                                                                      np->sticky_pktinfo.ipi6_addr;
1102                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1103                         }
1104                         if (np->rxopt.bits.rxohlim) {
1105                                 int hlim = np->mcast_hops;
1106                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1107                         }
1108                         if (np->rxopt.bits.rxflow) {
1109                                 __be32 flowinfo = np->rcv_flowinfo;
1110
1111                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1112                         }
1113                 }
1114                 len -= msg.msg_controllen;
1115                 return put_user(len, optlen);
1116         }
1117         case IPV6_MTU:
1118         {
1119                 struct dst_entry *dst;
1120
1121                 val = 0;
1122                 rcu_read_lock();
1123                 dst = __sk_dst_get(sk);
1124                 if (dst)
1125                         val = dst_mtu(dst);
1126                 rcu_read_unlock();
1127                 if (!val)
1128                         return -ENOTCONN;
1129                 break;
1130         }
1131
1132         case IPV6_V6ONLY:
1133                 val = sk->sk_ipv6only;
1134                 break;
1135
1136         case IPV6_RECVPKTINFO:
1137                 val = np->rxopt.bits.rxinfo;
1138                 break;
1139
1140         case IPV6_2292PKTINFO:
1141                 val = np->rxopt.bits.rxoinfo;
1142                 break;
1143
1144         case IPV6_RECVHOPLIMIT:
1145                 val = np->rxopt.bits.rxhlim;
1146                 break;
1147
1148         case IPV6_2292HOPLIMIT:
1149                 val = np->rxopt.bits.rxohlim;
1150                 break;
1151
1152         case IPV6_RECVRTHDR:
1153                 val = np->rxopt.bits.srcrt;
1154                 break;
1155
1156         case IPV6_2292RTHDR:
1157                 val = np->rxopt.bits.osrcrt;
1158                 break;
1159
1160         case IPV6_HOPOPTS:
1161         case IPV6_RTHDRDSTOPTS:
1162         case IPV6_RTHDR:
1163         case IPV6_DSTOPTS:
1164         {
1165                 struct ipv6_txoptions *opt;
1166
1167                 lock_sock(sk);
1168                 opt = rcu_dereference_protected(np->opt,
1169                                                 lockdep_sock_is_held(sk));
1170                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1171                 release_sock(sk);
1172                 /* check if ipv6_getsockopt_sticky() returns err code */
1173                 if (len < 0)
1174                         return len;
1175                 return put_user(len, optlen);
1176         }
1177
1178         case IPV6_RECVHOPOPTS:
1179                 val = np->rxopt.bits.hopopts;
1180                 break;
1181
1182         case IPV6_2292HOPOPTS:
1183                 val = np->rxopt.bits.ohopopts;
1184                 break;
1185
1186         case IPV6_RECVDSTOPTS:
1187                 val = np->rxopt.bits.dstopts;
1188                 break;
1189
1190         case IPV6_2292DSTOPTS:
1191                 val = np->rxopt.bits.odstopts;
1192                 break;
1193
1194         case IPV6_TCLASS:
1195                 val = np->tclass;
1196                 break;
1197
1198         case IPV6_RECVTCLASS:
1199                 val = np->rxopt.bits.rxtclass;
1200                 break;
1201
1202         case IPV6_FLOWINFO:
1203                 val = np->rxopt.bits.rxflow;
1204                 break;
1205
1206         case IPV6_RECVPATHMTU:
1207                 val = np->rxopt.bits.rxpmtu;
1208                 break;
1209
1210         case IPV6_PATHMTU:
1211         {
1212                 struct dst_entry *dst;
1213                 struct ip6_mtuinfo mtuinfo;
1214
1215                 if (len < sizeof(mtuinfo))
1216                         return -EINVAL;
1217
1218                 len = sizeof(mtuinfo);
1219                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1220
1221                 rcu_read_lock();
1222                 dst = __sk_dst_get(sk);
1223                 if (dst)
1224                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1225                 rcu_read_unlock();
1226                 if (!mtuinfo.ip6m_mtu)
1227                         return -ENOTCONN;
1228
1229                 if (put_user(len, optlen))
1230                         return -EFAULT;
1231                 if (copy_to_user(optval, &mtuinfo, len))
1232                         return -EFAULT;
1233
1234                 return 0;
1235         }
1236
1237         case IPV6_TRANSPARENT:
1238                 val = inet_sk(sk)->transparent;
1239                 break;
1240
1241         case IPV6_FREEBIND:
1242                 val = inet_sk(sk)->freebind;
1243                 break;
1244
1245         case IPV6_RECVORIGDSTADDR:
1246                 val = np->rxopt.bits.rxorigdstaddr;
1247                 break;
1248
1249         case IPV6_UNICAST_HOPS:
1250         case IPV6_MULTICAST_HOPS:
1251         {
1252                 struct dst_entry *dst;
1253
1254                 if (optname == IPV6_UNICAST_HOPS)
1255                         val = np->hop_limit;
1256                 else
1257                         val = np->mcast_hops;
1258
1259                 if (val < 0) {
1260                         rcu_read_lock();
1261                         dst = __sk_dst_get(sk);
1262                         if (dst)
1263                                 val = ip6_dst_hoplimit(dst);
1264                         rcu_read_unlock();
1265                 }
1266
1267                 if (val < 0)
1268                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1269                 break;
1270         }
1271
1272         case IPV6_MULTICAST_LOOP:
1273                 val = np->mc_loop;
1274                 break;
1275
1276         case IPV6_MULTICAST_IF:
1277                 val = np->mcast_oif;
1278                 break;
1279
1280         case IPV6_MULTICAST_ALL:
1281                 val = np->mc_all;
1282                 break;
1283
1284         case IPV6_UNICAST_IF:
1285                 val = (__force int)htonl((__u32) np->ucast_oif);
1286                 break;
1287
1288         case IPV6_MTU_DISCOVER:
1289                 val = np->pmtudisc;
1290                 break;
1291
1292         case IPV6_RECVERR:
1293                 val = np->recverr;
1294                 break;
1295
1296         case IPV6_FLOWINFO_SEND:
1297                 val = np->sndflow;
1298                 break;
1299
1300         case IPV6_FLOWLABEL_MGR:
1301         {
1302                 struct in6_flowlabel_req freq;
1303                 int flags;
1304
1305                 if (len < sizeof(freq))
1306                         return -EINVAL;
1307
1308                 if (copy_from_user(&freq, optval, sizeof(freq)))
1309                         return -EFAULT;
1310
1311                 if (freq.flr_action != IPV6_FL_A_GET)
1312                         return -EINVAL;
1313
1314                 len = sizeof(freq);
1315                 flags = freq.flr_flags;
1316
1317                 memset(&freq, 0, sizeof(freq));
1318
1319                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1320                 if (val < 0)
1321                         return val;
1322
1323                 if (put_user(len, optlen))
1324                         return -EFAULT;
1325                 if (copy_to_user(optval, &freq, len))
1326                         return -EFAULT;
1327
1328                 return 0;
1329         }
1330
1331         case IPV6_ADDR_PREFERENCES:
1332                 val = 0;
1333
1334                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1335                         val |= IPV6_PREFER_SRC_TMP;
1336                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1337                         val |= IPV6_PREFER_SRC_PUBLIC;
1338                 else {
1339                         /* XXX: should we return system default? */
1340                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1341                 }
1342
1343                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1344                         val |= IPV6_PREFER_SRC_COA;
1345                 else
1346                         val |= IPV6_PREFER_SRC_HOME;
1347                 break;
1348
1349         case IPV6_MINHOPCOUNT:
1350                 val = np->min_hopcount;
1351                 break;
1352
1353         case IPV6_DONTFRAG:
1354                 val = np->dontfrag;
1355                 break;
1356
1357         case IPV6_AUTOFLOWLABEL:
1358                 val = ip6_autoflowlabel(sock_net(sk), np);
1359                 break;
1360
1361         case IPV6_RECVFRAGSIZE:
1362                 val = np->rxopt.bits.recvfragsize;
1363                 break;
1364
1365         case IPV6_ROUTER_ALERT_ISOLATE:
1366                 val = np->rtalert_isolate;
1367                 break;
1368
1369         default:
1370                 return -ENOPROTOOPT;
1371         }
1372         len = min_t(unsigned int, sizeof(int), len);
1373         if (put_user(len, optlen))
1374                 return -EFAULT;
1375         if (copy_to_user(optval, &val, len))
1376                 return -EFAULT;
1377         return 0;
1378 }
1379
1380 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1381                     char __user *optval, int __user *optlen)
1382 {
1383         int err;
1384
1385         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1386                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1387
1388         if (level != SOL_IPV6)
1389                 return -ENOPROTOOPT;
1390
1391         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1392 #ifdef CONFIG_NETFILTER
1393         /* we need to exclude all possible ENOPROTOOPTs except default case */
1394         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1395                 int len;
1396
1397                 if (get_user(len, optlen))
1398                         return -EFAULT;
1399
1400                 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1401                 if (err >= 0)
1402                         err = put_user(len, optlen);
1403         }
1404 #endif
1405         return err;
1406 }
1407 EXPORT_SYMBOL(ipv6_getsockopt);
1408
1409 #ifdef CONFIG_COMPAT
1410 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1411                            char __user *optval, int __user *optlen)
1412 {
1413         int err;
1414
1415         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1416                 if (udp_prot.compat_getsockopt != NULL)
1417                         return udp_prot.compat_getsockopt(sk, level, optname,
1418                                                           optval, optlen);
1419                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1420         }
1421
1422         if (level != SOL_IPV6)
1423                 return -ENOPROTOOPT;
1424
1425         if (optname == MCAST_MSFILTER)
1426                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1427                         ipv6_getsockopt);
1428
1429         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1430                                  MSG_CMSG_COMPAT);
1431 #ifdef CONFIG_NETFILTER
1432         /* we need to exclude all possible ENOPROTOOPTs except default case */
1433         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1434                 int len;
1435
1436                 if (get_user(len, optlen))
1437                         return -EFAULT;
1438
1439                 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1440                 if (err >= 0)
1441                         err = put_user(len, optlen);
1442         }
1443 #endif
1444         return err;
1445 }
1446 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1447 #endif