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TOMOYO Linux Cross Reference
Linux/net/ipv6/ipv6_sockglue.c

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

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