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

Version: ~ [ linux-5.11 ] ~ [ linux-5.10.17 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.99 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.176 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.221 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.257 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.257 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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 
 56 #include <asm/uaccess.h>
 57 
 58 struct ip6_ra_chain *ip6_ra_chain;
 59 DEFINE_RWLOCK(ip6_ra_lock);
 60 
 61 int ip6_ra_control(struct sock *sk, int sel)
 62 {
 63         struct ip6_ra_chain *ra, *new_ra, **rap;
 64 
 65         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
 66         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
 67                 return -ENOPROTOOPT;
 68 
 69         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
 70 
 71         write_lock_bh(&ip6_ra_lock);
 72         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
 73                 if (ra->sk == sk) {
 74                         if (sel>=0) {
 75                                 write_unlock_bh(&ip6_ra_lock);
 76                                 kfree(new_ra);
 77                                 return -EADDRINUSE;
 78                         }
 79 
 80                         *rap = ra->next;
 81                         write_unlock_bh(&ip6_ra_lock);
 82 
 83                         sock_put(sk);
 84                         kfree(ra);
 85                         return 0;
 86                 }
 87         }
 88         if (new_ra == NULL) {
 89                 write_unlock_bh(&ip6_ra_lock);
 90                 return -ENOBUFS;
 91         }
 92         new_ra->sk = sk;
 93         new_ra->sel = sel;
 94         new_ra->next = ra;
 95         *rap = new_ra;
 96         sock_hold(sk);
 97         write_unlock_bh(&ip6_ra_lock);
 98         return 0;
 99 }
100 
101 static
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                 opt = xchg(&inet6_sk(sk)->opt, opt);
114         } else {
115                 spin_lock(&sk->sk_dst_lock);
116                 opt = xchg(&inet6_sk(sk)->opt, opt);
117                 spin_unlock(&sk->sk_dst_lock);
118         }
119         sk_dst_reset(sk);
120 
121         return opt;
122 }
123 
124 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
125                     char __user *optval, unsigned int optlen)
126 {
127         struct ipv6_pinfo *np = inet6_sk(sk);
128         struct net *net = sock_net(sk);
129         int val, valbool;
130         int retv = -ENOPROTOOPT;
131 
132         if (optval == NULL)
133                 val=0;
134         else {
135                 if (optlen >= sizeof(int)) {
136                         if (get_user(val, (int __user *) optval))
137                                 return -EFAULT;
138                 } else
139                         val = 0;
140         }
141 
142         valbool = (val!=0);
143 
144         if (ip6_mroute_opt(optname))
145                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
146 
147         lock_sock(sk);
148 
149         switch (optname) {
150 
151         case IPV6_ADDRFORM:
152                 if (optlen < sizeof(int))
153                         goto e_inval;
154                 if (val == PF_INET) {
155                         struct ipv6_txoptions *opt;
156                         struct sk_buff *pktopt;
157 
158                         if (sk->sk_type == SOCK_RAW)
159                                 break;
160 
161                         if (sk->sk_protocol == IPPROTO_UDP ||
162                             sk->sk_protocol == IPPROTO_UDPLITE) {
163                                 struct udp_sock *up = udp_sk(sk);
164                                 if (up->pending == AF_INET6) {
165                                         retv = -EBUSY;
166                                         break;
167                                 }
168                         } else if (sk->sk_protocol != IPPROTO_TCP)
169                                 break;
170 
171                         if (sk->sk_state != TCP_ESTABLISHED) {
172                                 retv = -ENOTCONN;
173                                 break;
174                         }
175 
176                         if (ipv6_only_sock(sk) ||
177                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
178                                 retv = -EADDRNOTAVAIL;
179                                 break;
180                         }
181 
182                         fl6_free_socklist(sk);
183                         ipv6_sock_mc_close(sk);
184 
185                         /*
186                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
187                          * remove it from the refcnt debug socks count in the
188                          * original family...
189                          */
190                         sk_refcnt_debug_dec(sk);
191 
192                         if (sk->sk_protocol == IPPROTO_TCP) {
193                                 struct inet_connection_sock *icsk = inet_csk(sk);
194                                 local_bh_disable();
195                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
196                                 sock_prot_inuse_add(net, &tcp_prot, 1);
197                                 local_bh_enable();
198                                 sk->sk_prot = &tcp_prot;
199                                 icsk->icsk_af_ops = &ipv4_specific;
200                                 sk->sk_socket->ops = &inet_stream_ops;
201                                 sk->sk_family = PF_INET;
202                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
203                         } else {
204                                 struct proto *prot = &udp_prot;
205 
206                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
207                                         prot = &udplite_prot;
208                                 local_bh_disable();
209                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
210                                 sock_prot_inuse_add(net, prot, 1);
211                                 local_bh_enable();
212                                 sk->sk_prot = prot;
213                                 sk->sk_socket->ops = &inet_dgram_ops;
214                                 sk->sk_family = PF_INET;
215                         }
216                         opt = xchg(&np->opt, NULL);
217                         if (opt)
218                                 sock_kfree_s(sk, opt, opt->tot_len);
219                         pktopt = xchg(&np->pktoptions, NULL);
220                         kfree_skb(pktopt);
221 
222                         sk->sk_destruct = inet_sock_destruct;
223                         /*
224                          * ... and add it to the refcnt debug socks count
225                          * in the new family. -acme
226                          */
227                         sk_refcnt_debug_inc(sk);
228                         module_put(THIS_MODULE);
229                         retv = 0;
230                         break;
231                 }
232                 goto e_inval;
233 
234         case IPV6_V6ONLY:
235                 if (optlen < sizeof(int) ||
236                     inet_sk(sk)->inet_num)
237                         goto e_inval;
238                 np->ipv6only = valbool;
239                 retv = 0;
240                 break;
241 
242         case IPV6_RECVPKTINFO:
243                 if (optlen < sizeof(int))
244                         goto e_inval;
245                 np->rxopt.bits.rxinfo = valbool;
246                 retv = 0;
247                 break;
248 
249         case IPV6_2292PKTINFO:
250                 if (optlen < sizeof(int))
251                         goto e_inval;
252                 np->rxopt.bits.rxoinfo = valbool;
253                 retv = 0;
254                 break;
255 
256         case IPV6_RECVHOPLIMIT:
257                 if (optlen < sizeof(int))
258                         goto e_inval;
259                 np->rxopt.bits.rxhlim = valbool;
260                 retv = 0;
261                 break;
262 
263         case IPV6_2292HOPLIMIT:
264                 if (optlen < sizeof(int))
265                         goto e_inval;
266                 np->rxopt.bits.rxohlim = valbool;
267                 retv = 0;
268                 break;
269 
270         case IPV6_RECVRTHDR:
271                 if (optlen < sizeof(int))
272                         goto e_inval;
273                 np->rxopt.bits.srcrt = valbool;
274                 retv = 0;
275                 break;
276 
277         case IPV6_2292RTHDR:
278                 if (optlen < sizeof(int))
279                         goto e_inval;
280                 np->rxopt.bits.osrcrt = valbool;
281                 retv = 0;
282                 break;
283 
284         case IPV6_RECVHOPOPTS:
285                 if (optlen < sizeof(int))
286                         goto e_inval;
287                 np->rxopt.bits.hopopts = valbool;
288                 retv = 0;
289                 break;
290 
291         case IPV6_2292HOPOPTS:
292                 if (optlen < sizeof(int))
293                         goto e_inval;
294                 np->rxopt.bits.ohopopts = valbool;
295                 retv = 0;
296                 break;
297 
298         case IPV6_RECVDSTOPTS:
299                 if (optlen < sizeof(int))
300                         goto e_inval;
301                 np->rxopt.bits.dstopts = valbool;
302                 retv = 0;
303                 break;
304 
305         case IPV6_2292DSTOPTS:
306                 if (optlen < sizeof(int))
307                         goto e_inval;
308                 np->rxopt.bits.odstopts = valbool;
309                 retv = 0;
310                 break;
311 
312         case IPV6_TCLASS:
313                 if (optlen < sizeof(int))
314                         goto e_inval;
315                 if (val < -1 || val > 0xff)
316                         goto e_inval;
317                 /* RFC 3542, 6.5: default traffic class of 0x0 */
318                 if (val == -1)
319                         val = 0;
320                 np->tclass = val;
321                 retv = 0;
322                 break;
323 
324         case IPV6_RECVTCLASS:
325                 if (optlen < sizeof(int))
326                         goto e_inval;
327                 np->rxopt.bits.rxtclass = valbool;
328                 retv = 0;
329                 break;
330 
331         case IPV6_FLOWINFO:
332                 if (optlen < sizeof(int))
333                         goto e_inval;
334                 np->rxopt.bits.rxflow = valbool;
335                 retv = 0;
336                 break;
337 
338         case IPV6_RECVPATHMTU:
339                 if (optlen < sizeof(int))
340                         goto e_inval;
341                 np->rxopt.bits.rxpmtu = valbool;
342                 retv = 0;
343                 break;
344 
345         case IPV6_TRANSPARENT:
346                 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
347                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
348                         retv = -EPERM;
349                         break;
350                 }
351                 if (optlen < sizeof(int))
352                         goto e_inval;
353                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
354                 inet_sk(sk)->transparent = valbool;
355                 retv = 0;
356                 break;
357 
358         case IPV6_RECVORIGDSTADDR:
359                 if (optlen < sizeof(int))
360                         goto e_inval;
361                 np->rxopt.bits.rxorigdstaddr = valbool;
362                 retv = 0;
363                 break;
364 
365         case IPV6_HOPOPTS:
366         case IPV6_RTHDRDSTOPTS:
367         case IPV6_RTHDR:
368         case IPV6_DSTOPTS:
369         {
370                 struct ipv6_txoptions *opt;
371 
372                 /* remove any sticky options header with a zero option
373                  * length, per RFC3542.
374                  */
375                 if (optlen == 0)
376                         optval = NULL;
377                 else if (optval == NULL)
378                         goto e_inval;
379                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
380                          optlen & 0x7 || optlen > 8 * 255)
381                         goto e_inval;
382 
383                 /* hop-by-hop / destination options are privileged option */
384                 retv = -EPERM;
385                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
386                         break;
387 
388                 opt = ipv6_renew_options(sk, np->opt, optname,
389                                          (struct ipv6_opt_hdr __user *)optval,
390                                          optlen);
391                 if (IS_ERR(opt)) {
392                         retv = PTR_ERR(opt);
393                         break;
394                 }
395 
396                 /* routing header option needs extra check */
397                 retv = -EINVAL;
398                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
399                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
400                         switch (rthdr->type) {
401 #if IS_ENABLED(CONFIG_IPV6_MIP6)
402                         case IPV6_SRCRT_TYPE_2:
403                                 if (rthdr->hdrlen != 2 ||
404                                     rthdr->segments_left != 1)
405                                         goto sticky_done;
406 
407                                 break;
408 #endif
409                         default:
410                                 goto sticky_done;
411                         }
412                 }
413 
414                 retv = 0;
415                 opt = ipv6_update_options(sk, opt);
416 sticky_done:
417                 if (opt)
418                         sock_kfree_s(sk, opt, opt->tot_len);
419                 break;
420         }
421 
422         case IPV6_PKTINFO:
423         {
424                 struct in6_pktinfo pkt;
425 
426                 if (optlen == 0)
427                         goto e_inval;
428                 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
429                         goto e_inval;
430 
431                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
432                                 retv = -EFAULT;
433                                 break;
434                 }
435                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
436                         goto e_inval;
437 
438                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
439                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
440                 retv = 0;
441                 break;
442         }
443 
444         case IPV6_2292PKTOPTIONS:
445         {
446                 struct ipv6_txoptions *opt = NULL;
447                 struct msghdr msg;
448                 struct flowi6 fl6;
449                 int junk;
450 
451                 memset(&fl6, 0, sizeof(fl6));
452                 fl6.flowi6_oif = sk->sk_bound_dev_if;
453                 fl6.flowi6_mark = sk->sk_mark;
454 
455                 if (optlen == 0)
456                         goto update;
457 
458                 /* 1K is probably excessive
459                  * 1K is surely not enough, 2K per standard header is 16K.
460                  */
461                 retv = -EINVAL;
462                 if (optlen > 64*1024)
463                         break;
464 
465                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
466                 retv = -ENOBUFS;
467                 if (opt == NULL)
468                         break;
469 
470                 memset(opt, 0, sizeof(*opt));
471                 opt->tot_len = sizeof(*opt) + optlen;
472                 retv = -EFAULT;
473                 if (copy_from_user(opt+1, optval, optlen))
474                         goto done;
475 
476                 msg.msg_controllen = optlen;
477                 msg.msg_control = (void*)(opt+1);
478 
479                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk,
480                                              &junk, &junk);
481                 if (retv)
482                         goto done;
483 update:
484                 retv = 0;
485                 opt = ipv6_update_options(sk, opt);
486 done:
487                 if (opt)
488                         sock_kfree_s(sk, opt, opt->tot_len);
489                 break;
490         }
491         case IPV6_UNICAST_HOPS:
492                 if (optlen < sizeof(int))
493                         goto e_inval;
494                 if (val > 255 || val < -1)
495                         goto e_inval;
496                 np->hop_limit = val;
497                 retv = 0;
498                 break;
499 
500         case IPV6_MULTICAST_HOPS:
501                 if (sk->sk_type == SOCK_STREAM)
502                         break;
503                 if (optlen < sizeof(int))
504                         goto e_inval;
505                 if (val > 255 || val < -1)
506                         goto e_inval;
507                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
508                 retv = 0;
509                 break;
510 
511         case IPV6_MULTICAST_LOOP:
512                 if (optlen < sizeof(int))
513                         goto e_inval;
514                 if (val != valbool)
515                         goto e_inval;
516                 np->mc_loop = valbool;
517                 retv = 0;
518                 break;
519 
520         case IPV6_UNICAST_IF:
521         {
522                 struct net_device *dev = NULL;
523                 int ifindex;
524 
525                 if (optlen != sizeof(int))
526                         goto e_inval;
527 
528                 ifindex = (__force int)ntohl((__force __be32)val);
529                 if (ifindex == 0) {
530                         np->ucast_oif = 0;
531                         retv = 0;
532                         break;
533                 }
534 
535                 dev = dev_get_by_index(net, ifindex);
536                 retv = -EADDRNOTAVAIL;
537                 if (!dev)
538                         break;
539                 dev_put(dev);
540 
541                 retv = -EINVAL;
542                 if (sk->sk_bound_dev_if)
543                         break;
544 
545                 np->ucast_oif = ifindex;
546                 retv = 0;
547                 break;
548         }
549 
550         case IPV6_MULTICAST_IF:
551                 if (sk->sk_type == SOCK_STREAM)
552                         break;
553                 if (optlen < sizeof(int))
554                         goto e_inval;
555 
556                 if (val) {
557                         struct net_device *dev;
558 
559                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
560                                 goto e_inval;
561 
562                         dev = dev_get_by_index(net, val);
563                         if (!dev) {
564                                 retv = -ENODEV;
565                                 break;
566                         }
567                         dev_put(dev);
568                 }
569                 np->mcast_oif = val;
570                 retv = 0;
571                 break;
572         case IPV6_ADD_MEMBERSHIP:
573         case IPV6_DROP_MEMBERSHIP:
574         {
575                 struct ipv6_mreq mreq;
576 
577                 if (optlen < sizeof(struct ipv6_mreq))
578                         goto e_inval;
579 
580                 retv = -EPROTO;
581                 if (inet_sk(sk)->is_icsk)
582                         break;
583 
584                 retv = -EFAULT;
585                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
586                         break;
587 
588                 if (optname == IPV6_ADD_MEMBERSHIP)
589                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
590                 else
591                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
592                 break;
593         }
594         case IPV6_JOIN_ANYCAST:
595         case IPV6_LEAVE_ANYCAST:
596         {
597                 struct ipv6_mreq mreq;
598 
599                 if (optlen < sizeof(struct ipv6_mreq))
600                         goto e_inval;
601 
602                 retv = -EFAULT;
603                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
604                         break;
605 
606                 if (optname == IPV6_JOIN_ANYCAST)
607                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
608                 else
609                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
610                 break;
611         }
612         case MCAST_JOIN_GROUP:
613         case MCAST_LEAVE_GROUP:
614         {
615                 struct group_req greq;
616                 struct sockaddr_in6 *psin6;
617 
618                 if (optlen < sizeof(struct group_req))
619                         goto e_inval;
620 
621                 retv = -EFAULT;
622                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
623                         break;
624                 if (greq.gr_group.ss_family != AF_INET6) {
625                         retv = -EADDRNOTAVAIL;
626                         break;
627                 }
628                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
629                 if (optname == MCAST_JOIN_GROUP)
630                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
631                                 &psin6->sin6_addr);
632                 else
633                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
634                                 &psin6->sin6_addr);
635                 break;
636         }
637         case MCAST_JOIN_SOURCE_GROUP:
638         case MCAST_LEAVE_SOURCE_GROUP:
639         case MCAST_BLOCK_SOURCE:
640         case MCAST_UNBLOCK_SOURCE:
641         {
642                 struct group_source_req greqs;
643                 int omode, add;
644 
645                 if (optlen < sizeof(struct group_source_req))
646                         goto e_inval;
647                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
648                         retv = -EFAULT;
649                         break;
650                 }
651                 if (greqs.gsr_group.ss_family != AF_INET6 ||
652                     greqs.gsr_source.ss_family != AF_INET6) {
653                         retv = -EADDRNOTAVAIL;
654                         break;
655                 }
656                 if (optname == MCAST_BLOCK_SOURCE) {
657                         omode = MCAST_EXCLUDE;
658                         add = 1;
659                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
660                         omode = MCAST_EXCLUDE;
661                         add = 0;
662                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
663                         struct sockaddr_in6 *psin6;
664 
665                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
666                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
667                                 &psin6->sin6_addr);
668                         /* prior join w/ different source is ok */
669                         if (retv && retv != -EADDRINUSE)
670                                 break;
671                         omode = MCAST_INCLUDE;
672                         add = 1;
673                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
674                         omode = MCAST_INCLUDE;
675                         add = 0;
676                 }
677                 retv = ip6_mc_source(add, omode, sk, &greqs);
678                 break;
679         }
680         case MCAST_MSFILTER:
681         {
682                 struct group_filter *gsf;
683 
684                 if (optlen < GROUP_FILTER_SIZE(0))
685                         goto e_inval;
686                 if (optlen > sysctl_optmem_max) {
687                         retv = -ENOBUFS;
688                         break;
689                 }
690                 gsf = kmalloc(optlen,GFP_KERNEL);
691                 if (!gsf) {
692                         retv = -ENOBUFS;
693                         break;
694                 }
695                 retv = -EFAULT;
696                 if (copy_from_user(gsf, optval, optlen)) {
697                         kfree(gsf);
698                         break;
699                 }
700                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
701                 if (gsf->gf_numsrc >= 0x1ffffffU ||
702                     gsf->gf_numsrc > sysctl_mld_max_msf) {
703                         kfree(gsf);
704                         retv = -ENOBUFS;
705                         break;
706                 }
707                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
708                         kfree(gsf);
709                         retv = -EINVAL;
710                         break;
711                 }
712                 retv = ip6_mc_msfilter(sk, gsf);
713                 kfree(gsf);
714 
715                 break;
716         }
717         case IPV6_ROUTER_ALERT:
718                 if (optlen < sizeof(int))
719                         goto e_inval;
720                 retv = ip6_ra_control(sk, val);
721                 break;
722         case IPV6_MTU_DISCOVER:
723                 if (optlen < sizeof(int))
724                         goto e_inval;
725                 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
726                         goto e_inval;
727                 np->pmtudisc = val;
728                 retv = 0;
729                 break;
730         case IPV6_MTU:
731                 if (optlen < sizeof(int))
732                         goto e_inval;
733                 if (val && val < IPV6_MIN_MTU)
734                         goto e_inval;
735                 np->frag_size = val;
736                 retv = 0;
737                 break;
738         case IPV6_RECVERR:
739                 if (optlen < sizeof(int))
740                         goto e_inval;
741                 np->recverr = valbool;
742                 if (!val)
743                         skb_queue_purge(&sk->sk_error_queue);
744                 retv = 0;
745                 break;
746         case IPV6_FLOWINFO_SEND:
747                 if (optlen < sizeof(int))
748                         goto e_inval;
749                 np->sndflow = valbool;
750                 retv = 0;
751                 break;
752         case IPV6_FLOWLABEL_MGR:
753                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
754                 break;
755         case IPV6_IPSEC_POLICY:
756         case IPV6_XFRM_POLICY:
757                 retv = -EPERM;
758                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
759                         break;
760                 retv = xfrm_user_policy(sk, optname, optval, optlen);
761                 break;
762 
763         case IPV6_ADDR_PREFERENCES:
764             {
765                 unsigned int pref = 0;
766                 unsigned int prefmask = ~0;
767 
768                 if (optlen < sizeof(int))
769                         goto e_inval;
770 
771                 retv = -EINVAL;
772 
773                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
774                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
775                                IPV6_PREFER_SRC_TMP|
776                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
777                 case IPV6_PREFER_SRC_PUBLIC:
778                         pref |= IPV6_PREFER_SRC_PUBLIC;
779                         break;
780                 case IPV6_PREFER_SRC_TMP:
781                         pref |= IPV6_PREFER_SRC_TMP;
782                         break;
783                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
784                         break;
785                 case 0:
786                         goto pref_skip_pubtmp;
787                 default:
788                         goto e_inval;
789                 }
790 
791                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
792                               IPV6_PREFER_SRC_TMP);
793 pref_skip_pubtmp:
794 
795                 /* check HOME/COA conflicts */
796                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
797                 case IPV6_PREFER_SRC_HOME:
798                         break;
799                 case IPV6_PREFER_SRC_COA:
800                         pref |= IPV6_PREFER_SRC_COA;
801                 case 0:
802                         goto pref_skip_coa;
803                 default:
804                         goto e_inval;
805                 }
806 
807                 prefmask &= ~IPV6_PREFER_SRC_COA;
808 pref_skip_coa:
809 
810                 /* check CGA/NONCGA conflicts */
811                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
812                 case IPV6_PREFER_SRC_CGA:
813                 case IPV6_PREFER_SRC_NONCGA:
814                 case 0:
815                         break;
816                 default:
817                         goto e_inval;
818                 }
819 
820                 np->srcprefs = (np->srcprefs & prefmask) | pref;
821                 retv = 0;
822 
823                 break;
824             }
825         case IPV6_MINHOPCOUNT:
826                 if (optlen < sizeof(int))
827                         goto e_inval;
828                 if (val < 0 || val > 255)
829                         goto e_inval;
830                 np->min_hopcount = val;
831                 retv = 0;
832                 break;
833         case IPV6_DONTFRAG:
834                 np->dontfrag = valbool;
835                 retv = 0;
836                 break;
837         }
838 
839         release_sock(sk);
840 
841         return retv;
842 
843 e_inval:
844         release_sock(sk);
845         return -EINVAL;
846 }
847 
848 int ipv6_setsockopt(struct sock *sk, int level, int optname,
849                     char __user *optval, unsigned int optlen)
850 {
851         int err;
852 
853         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
854                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
855 
856         if (level != SOL_IPV6)
857                 return -ENOPROTOOPT;
858 
859         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
860 #ifdef CONFIG_NETFILTER
861         /* we need to exclude all possible ENOPROTOOPTs except default case */
862         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
863                         optname != IPV6_XFRM_POLICY) {
864                 lock_sock(sk);
865                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
866                                 optlen);
867                 release_sock(sk);
868         }
869 #endif
870         return err;
871 }
872 
873 EXPORT_SYMBOL(ipv6_setsockopt);
874 
875 #ifdef CONFIG_COMPAT
876 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
877                            char __user *optval, unsigned int optlen)
878 {
879         int err;
880 
881         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
882                 if (udp_prot.compat_setsockopt != NULL)
883                         return udp_prot.compat_setsockopt(sk, level, optname,
884                                                           optval, optlen);
885                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
886         }
887 
888         if (level != SOL_IPV6)
889                 return -ENOPROTOOPT;
890 
891         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
892                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
893                         ipv6_setsockopt);
894 
895         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
896 #ifdef CONFIG_NETFILTER
897         /* we need to exclude all possible ENOPROTOOPTs except default case */
898         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
899             optname != IPV6_XFRM_POLICY) {
900                 lock_sock(sk);
901                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
902                                            optval, optlen);
903                 release_sock(sk);
904         }
905 #endif
906         return err;
907 }
908 
909 EXPORT_SYMBOL(compat_ipv6_setsockopt);
910 #endif
911 
912 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
913                                   int optname, char __user *optval, int len)
914 {
915         struct ipv6_opt_hdr *hdr;
916 
917         if (!opt)
918                 return 0;
919 
920         switch(optname) {
921         case IPV6_HOPOPTS:
922                 hdr = opt->hopopt;
923                 break;
924         case IPV6_RTHDRDSTOPTS:
925                 hdr = opt->dst0opt;
926                 break;
927         case IPV6_RTHDR:
928                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
929                 break;
930         case IPV6_DSTOPTS:
931                 hdr = opt->dst1opt;
932                 break;
933         default:
934                 return -EINVAL; /* should not happen */
935         }
936 
937         if (!hdr)
938                 return 0;
939 
940         len = min_t(unsigned int, len, ipv6_optlen(hdr));
941         if (copy_to_user(optval, hdr, len))
942                 return -EFAULT;
943         return len;
944 }
945 
946 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
947                     char __user *optval, int __user *optlen, unsigned int flags)
948 {
949         struct ipv6_pinfo *np = inet6_sk(sk);
950         int len;
951         int val;
952 
953         if (ip6_mroute_opt(optname))
954                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
955 
956         if (get_user(len, optlen))
957                 return -EFAULT;
958         switch (optname) {
959         case IPV6_ADDRFORM:
960                 if (sk->sk_protocol != IPPROTO_UDP &&
961                     sk->sk_protocol != IPPROTO_UDPLITE &&
962                     sk->sk_protocol != IPPROTO_TCP)
963                         return -ENOPROTOOPT;
964                 if (sk->sk_state != TCP_ESTABLISHED)
965                         return -ENOTCONN;
966                 val = sk->sk_family;
967                 break;
968         case MCAST_MSFILTER:
969         {
970                 struct group_filter gsf;
971                 int err;
972 
973                 if (len < GROUP_FILTER_SIZE(0))
974                         return -EINVAL;
975                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
976                         return -EFAULT;
977                 if (gsf.gf_group.ss_family != AF_INET6)
978                         return -EADDRNOTAVAIL;
979                 lock_sock(sk);
980                 err = ip6_mc_msfget(sk, &gsf,
981                         (struct group_filter __user *)optval, optlen);
982                 release_sock(sk);
983                 return err;
984         }
985 
986         case IPV6_2292PKTOPTIONS:
987         {
988                 struct msghdr msg;
989                 struct sk_buff *skb;
990 
991                 if (sk->sk_type != SOCK_STREAM)
992                         return -ENOPROTOOPT;
993 
994                 msg.msg_control = optval;
995                 msg.msg_controllen = len;
996                 msg.msg_flags = flags;
997 
998                 lock_sock(sk);
999                 skb = np->pktoptions;
1000                 if (skb)
1001                         atomic_inc(&skb->users);
1002                 release_sock(sk);
1003 
1004                 if (skb) {
1005                         int err = ip6_datagram_recv_ctl(sk, &msg, skb);
1006                         kfree_skb(skb);
1007                         if (err)
1008                                 return err;
1009                 } else {
1010                         if (np->rxopt.bits.rxinfo) {
1011                                 struct in6_pktinfo src_info;
1012                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1013                                         np->sticky_pktinfo.ipi6_ifindex;
1014                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1015                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1016                         }
1017                         if (np->rxopt.bits.rxhlim) {
1018                                 int hlim = np->mcast_hops;
1019                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1020                         }
1021                         if (np->rxopt.bits.rxtclass) {
1022                                 int tclass = np->rcv_tclass;
1023                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1024                         }
1025                         if (np->rxopt.bits.rxoinfo) {
1026                                 struct in6_pktinfo src_info;
1027                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1028                                         np->sticky_pktinfo.ipi6_ifindex;
1029                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1030                                                                      np->sticky_pktinfo.ipi6_addr;
1031                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1032                         }
1033                         if (np->rxopt.bits.rxohlim) {
1034                                 int hlim = np->mcast_hops;
1035                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1036                         }
1037                 }
1038                 len -= msg.msg_controllen;
1039                 return put_user(len, optlen);
1040         }
1041         case IPV6_MTU:
1042         {
1043                 struct dst_entry *dst;
1044 
1045                 val = 0;
1046                 rcu_read_lock();
1047                 dst = __sk_dst_get(sk);
1048                 if (dst)
1049                         val = dst_mtu(dst);
1050                 rcu_read_unlock();
1051                 if (!val)
1052                         return -ENOTCONN;
1053                 break;
1054         }
1055 
1056         case IPV6_V6ONLY:
1057                 val = np->ipv6only;
1058                 break;
1059 
1060         case IPV6_RECVPKTINFO:
1061                 val = np->rxopt.bits.rxinfo;
1062                 break;
1063 
1064         case IPV6_2292PKTINFO:
1065                 val = np->rxopt.bits.rxoinfo;
1066                 break;
1067 
1068         case IPV6_RECVHOPLIMIT:
1069                 val = np->rxopt.bits.rxhlim;
1070                 break;
1071 
1072         case IPV6_2292HOPLIMIT:
1073                 val = np->rxopt.bits.rxohlim;
1074                 break;
1075 
1076         case IPV6_RECVRTHDR:
1077                 val = np->rxopt.bits.srcrt;
1078                 break;
1079 
1080         case IPV6_2292RTHDR:
1081                 val = np->rxopt.bits.osrcrt;
1082                 break;
1083 
1084         case IPV6_HOPOPTS:
1085         case IPV6_RTHDRDSTOPTS:
1086         case IPV6_RTHDR:
1087         case IPV6_DSTOPTS:
1088         {
1089 
1090                 lock_sock(sk);
1091                 len = ipv6_getsockopt_sticky(sk, np->opt,
1092                                              optname, optval, len);
1093                 release_sock(sk);
1094                 /* check if ipv6_getsockopt_sticky() returns err code */
1095                 if (len < 0)
1096                         return len;
1097                 return put_user(len, optlen);
1098         }
1099 
1100         case IPV6_RECVHOPOPTS:
1101                 val = np->rxopt.bits.hopopts;
1102                 break;
1103 
1104         case IPV6_2292HOPOPTS:
1105                 val = np->rxopt.bits.ohopopts;
1106                 break;
1107 
1108         case IPV6_RECVDSTOPTS:
1109                 val = np->rxopt.bits.dstopts;
1110                 break;
1111 
1112         case IPV6_2292DSTOPTS:
1113                 val = np->rxopt.bits.odstopts;
1114                 break;
1115 
1116         case IPV6_TCLASS:
1117                 val = np->tclass;
1118                 break;
1119 
1120         case IPV6_RECVTCLASS:
1121                 val = np->rxopt.bits.rxtclass;
1122                 break;
1123 
1124         case IPV6_FLOWINFO:
1125                 val = np->rxopt.bits.rxflow;
1126                 break;
1127 
1128         case IPV6_RECVPATHMTU:
1129                 val = np->rxopt.bits.rxpmtu;
1130                 break;
1131 
1132         case IPV6_PATHMTU:
1133         {
1134                 struct dst_entry *dst;
1135                 struct ip6_mtuinfo mtuinfo;
1136 
1137                 if (len < sizeof(mtuinfo))
1138                         return -EINVAL;
1139 
1140                 len = sizeof(mtuinfo);
1141                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1142 
1143                 rcu_read_lock();
1144                 dst = __sk_dst_get(sk);
1145                 if (dst)
1146                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1147                 rcu_read_unlock();
1148                 if (!mtuinfo.ip6m_mtu)
1149                         return -ENOTCONN;
1150 
1151                 if (put_user(len, optlen))
1152                         return -EFAULT;
1153                 if (copy_to_user(optval, &mtuinfo, len))
1154                         return -EFAULT;
1155 
1156                 return 0;
1157                 break;
1158         }
1159 
1160         case IPV6_TRANSPARENT:
1161                 val = inet_sk(sk)->transparent;
1162                 break;
1163 
1164         case IPV6_RECVORIGDSTADDR:
1165                 val = np->rxopt.bits.rxorigdstaddr;
1166                 break;
1167 
1168         case IPV6_UNICAST_HOPS:
1169         case IPV6_MULTICAST_HOPS:
1170         {
1171                 struct dst_entry *dst;
1172 
1173                 if (optname == IPV6_UNICAST_HOPS)
1174                         val = np->hop_limit;
1175                 else
1176                         val = np->mcast_hops;
1177 
1178                 if (val < 0) {
1179                         rcu_read_lock();
1180                         dst = __sk_dst_get(sk);
1181                         if (dst)
1182                                 val = ip6_dst_hoplimit(dst);
1183                         rcu_read_unlock();
1184                 }
1185 
1186                 if (val < 0)
1187                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1188                 break;
1189         }
1190 
1191         case IPV6_MULTICAST_LOOP:
1192                 val = np->mc_loop;
1193                 break;
1194 
1195         case IPV6_MULTICAST_IF:
1196                 val = np->mcast_oif;
1197                 break;
1198 
1199         case IPV6_UNICAST_IF:
1200                 val = (__force int)htonl((__u32) np->ucast_oif);
1201                 break;
1202 
1203         case IPV6_MTU_DISCOVER:
1204                 val = np->pmtudisc;
1205                 break;
1206 
1207         case IPV6_RECVERR:
1208                 val = np->recverr;
1209                 break;
1210 
1211         case IPV6_FLOWINFO_SEND:
1212                 val = np->sndflow;
1213                 break;
1214 
1215         case IPV6_FLOWLABEL_MGR:
1216         {
1217                 struct in6_flowlabel_req freq;
1218 
1219                 if (len < sizeof(freq))
1220                         return -EINVAL;
1221 
1222                 if (copy_from_user(&freq, optval, sizeof(freq)))
1223                         return -EFAULT;
1224 
1225                 if (freq.flr_action != IPV6_FL_A_GET)
1226                         return -EINVAL;
1227 
1228                 len = sizeof(freq);
1229                 memset(&freq, 0, sizeof(freq));
1230 
1231                 val = ipv6_flowlabel_opt_get(sk, &freq);
1232                 if (val < 0)
1233                         return val;
1234 
1235                 if (put_user(len, optlen))
1236                         return -EFAULT;
1237                 if (copy_to_user(optval, &freq, len))
1238                         return -EFAULT;
1239 
1240                 return 0;
1241         }
1242 
1243         case IPV6_ADDR_PREFERENCES:
1244                 val = 0;
1245 
1246                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1247                         val |= IPV6_PREFER_SRC_TMP;
1248                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1249                         val |= IPV6_PREFER_SRC_PUBLIC;
1250                 else {
1251                         /* XXX: should we return system default? */
1252                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1253                 }
1254 
1255                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1256                         val |= IPV6_PREFER_SRC_COA;
1257                 else
1258                         val |= IPV6_PREFER_SRC_HOME;
1259                 break;
1260 
1261         case IPV6_MINHOPCOUNT:
1262                 val = np->min_hopcount;
1263                 break;
1264 
1265         case IPV6_DONTFRAG:
1266                 val = np->dontfrag;
1267                 break;
1268 
1269         default:
1270                 return -ENOPROTOOPT;
1271         }
1272         len = min_t(unsigned int, sizeof(int), len);
1273         if(put_user(len, optlen))
1274                 return -EFAULT;
1275         if(copy_to_user(optval,&val,len))
1276                 return -EFAULT;
1277         return 0;
1278 }
1279 
1280 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1281                     char __user *optval, int __user *optlen)
1282 {
1283         int err;
1284 
1285         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1286                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1287 
1288         if(level != SOL_IPV6)
1289                 return -ENOPROTOOPT;
1290 
1291         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1292 #ifdef CONFIG_NETFILTER
1293         /* we need to exclude all possible ENOPROTOOPTs except default case */
1294         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1295                 int len;
1296 
1297                 if (get_user(len, optlen))
1298                         return -EFAULT;
1299 
1300                 lock_sock(sk);
1301                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1302                                 &len);
1303                 release_sock(sk);
1304                 if (err >= 0)
1305                         err = put_user(len, optlen);
1306         }
1307 #endif
1308         return err;
1309 }
1310 
1311 EXPORT_SYMBOL(ipv6_getsockopt);
1312 
1313 #ifdef CONFIG_COMPAT
1314 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1315                            char __user *optval, int __user *optlen)
1316 {
1317         int err;
1318 
1319         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1320                 if (udp_prot.compat_getsockopt != NULL)
1321                         return udp_prot.compat_getsockopt(sk, level, optname,
1322                                                           optval, optlen);
1323                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1324         }
1325 
1326         if (level != SOL_IPV6)
1327                 return -ENOPROTOOPT;
1328 
1329         if (optname == MCAST_MSFILTER)
1330                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1331                         ipv6_getsockopt);
1332 
1333         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1334                                  MSG_CMSG_COMPAT);
1335 #ifdef CONFIG_NETFILTER
1336         /* we need to exclude all possible ENOPROTOOPTs except default case */
1337         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1338                 int len;
1339 
1340                 if (get_user(len, optlen))
1341                         return -EFAULT;
1342 
1343                 lock_sock(sk);
1344                 err = compat_nf_getsockopt(sk, PF_INET6,
1345                                            optname, optval, &len);
1346                 release_sock(sk);
1347                 if (err >= 0)
1348                         err = put_user(len, optlen);
1349         }
1350 #endif
1351         return err;
1352 }
1353 
1354 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1355 #endif
1356 
1357 

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