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

Version: ~ [ linux-5.18 ] ~ [ linux-5.17.9 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.41 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.117 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.195 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.244 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.280 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.315 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ 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) {
 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         }
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_ADD_MEMBERSHIP:
125         case IPV6_DROP_MEMBERSHIP:
126         case IPV6_JOIN_ANYCAST:
127         case IPV6_LEAVE_ANYCAST:
128         case MCAST_JOIN_GROUP:
129         case MCAST_LEAVE_GROUP:
130         case MCAST_JOIN_SOURCE_GROUP:
131         case MCAST_LEAVE_SOURCE_GROUP:
132         case MCAST_BLOCK_SOURCE:
133         case MCAST_UNBLOCK_SOURCE:
134         case MCAST_MSFILTER:
135                 return true;
136         }
137         return false;
138 }
139 
140 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
141                     char __user *optval, unsigned int optlen)
142 {
143         struct ipv6_pinfo *np = inet6_sk(sk);
144         struct net *net = sock_net(sk);
145         int val, valbool;
146         int retv = -ENOPROTOOPT;
147         bool needs_rtnl = setsockopt_needs_rtnl(optname);
148 
149         if (!optval)
150                 val = 0;
151         else {
152                 if (optlen >= sizeof(int)) {
153                         if (get_user(val, (int __user *) optval))
154                                 return -EFAULT;
155                 } else
156                         val = 0;
157         }
158 
159         valbool = (val != 0);
160 
161         if (ip6_mroute_opt(optname))
162                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
163 
164         if (needs_rtnl)
165                 rtnl_lock();
166         lock_sock(sk);
167 
168         switch (optname) {
169 
170         case IPV6_ADDRFORM:
171                 if (optlen < sizeof(int))
172                         goto e_inval;
173                 if (val == PF_INET) {
174                         struct ipv6_txoptions *opt;
175                         struct sk_buff *pktopt;
176 
177                         if (sk->sk_type == SOCK_RAW)
178                                 break;
179 
180                         if (sk->sk_protocol == IPPROTO_UDP ||
181                             sk->sk_protocol == IPPROTO_UDPLITE) {
182                                 struct udp_sock *up = udp_sk(sk);
183                                 if (up->pending == AF_INET6) {
184                                         retv = -EBUSY;
185                                         break;
186                                 }
187                         } else if (sk->sk_protocol != IPPROTO_TCP)
188                                 break;
189 
190                         if (sk->sk_state != TCP_ESTABLISHED) {
191                                 retv = -ENOTCONN;
192                                 break;
193                         }
194 
195                         if (ipv6_only_sock(sk) ||
196                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
197                                 retv = -EADDRNOTAVAIL;
198                                 break;
199                         }
200 
201                         fl6_free_socklist(sk);
202                         ipv6_sock_mc_close(sk);
203 
204                         /*
205                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
206                          * remove it from the refcnt debug socks count in the
207                          * original family...
208                          */
209                         sk_refcnt_debug_dec(sk);
210 
211                         if (sk->sk_protocol == IPPROTO_TCP) {
212                                 struct inet_connection_sock *icsk = inet_csk(sk);
213                                 local_bh_disable();
214                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
215                                 sock_prot_inuse_add(net, &tcp_prot, 1);
216                                 local_bh_enable();
217                                 sk->sk_prot = &tcp_prot;
218                                 icsk->icsk_af_ops = &ipv4_specific;
219                                 sk->sk_socket->ops = &inet_stream_ops;
220                                 sk->sk_family = PF_INET;
221                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
222                         } else {
223                                 struct proto *prot = &udp_prot;
224 
225                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
226                                         prot = &udplite_prot;
227                                 local_bh_disable();
228                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
229                                 sock_prot_inuse_add(net, prot, 1);
230                                 local_bh_enable();
231                                 sk->sk_prot = prot;
232                                 sk->sk_socket->ops = &inet_dgram_ops;
233                                 sk->sk_family = PF_INET;
234                         }
235                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
236                                    NULL);
237                         if (opt) {
238                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
239                                 txopt_put(opt);
240                         }
241                         pktopt = xchg(&np->pktoptions, NULL);
242                         kfree_skb(pktopt);
243 
244                         sk->sk_destruct = inet_sock_destruct;
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, sock_owned_by_user(sk));
411                 opt = ipv6_renew_options(sk, opt, optname,
412                                          (struct ipv6_opt_hdr __user *)optval,
413                                          optlen);
414                 if (IS_ERR(opt)) {
415                         retv = PTR_ERR(opt);
416                         break;
417                 }
418 
419                 /* routing header option needs extra check */
420                 retv = -EINVAL;
421                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
422                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
423                         switch (rthdr->type) {
424 #if IS_ENABLED(CONFIG_IPV6_MIP6)
425                         case IPV6_SRCRT_TYPE_2:
426                                 if (rthdr->hdrlen != 2 ||
427                                     rthdr->segments_left != 1)
428                                         goto sticky_done;
429 
430                                 break;
431 #endif
432                         default:
433                                 goto sticky_done;
434                         }
435                 }
436 
437                 retv = 0;
438                 opt = ipv6_update_options(sk, opt);
439 sticky_done:
440                 if (opt) {
441                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
442                         txopt_put(opt);
443                 }
444                 break;
445         }
446 
447         case IPV6_PKTINFO:
448         {
449                 struct in6_pktinfo pkt;
450 
451                 if (optlen == 0)
452                         goto e_inval;
453                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
454                         goto e_inval;
455 
456                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
457                                 retv = -EFAULT;
458                                 break;
459                 }
460                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
461                         goto e_inval;
462 
463                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
464                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
465                 retv = 0;
466                 break;
467         }
468 
469         case IPV6_2292PKTOPTIONS:
470         {
471                 struct ipv6_txoptions *opt = NULL;
472                 struct msghdr msg;
473                 struct flowi6 fl6;
474                 int junk;
475 
476                 memset(&fl6, 0, sizeof(fl6));
477                 fl6.flowi6_oif = sk->sk_bound_dev_if;
478                 fl6.flowi6_mark = sk->sk_mark;
479 
480                 if (optlen == 0)
481                         goto update;
482 
483                 /* 1K is probably excessive
484                  * 1K is surely not enough, 2K per standard header is 16K.
485                  */
486                 retv = -EINVAL;
487                 if (optlen > 64*1024)
488                         break;
489 
490                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
491                 retv = -ENOBUFS;
492                 if (!opt)
493                         break;
494 
495                 memset(opt, 0, sizeof(*opt));
496                 atomic_set(&opt->refcnt, 1);
497                 opt->tot_len = sizeof(*opt) + optlen;
498                 retv = -EFAULT;
499                 if (copy_from_user(opt+1, optval, optlen))
500                         goto done;
501 
502                 msg.msg_controllen = optlen;
503                 msg.msg_control = (void *)(opt+1);
504 
505                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk,
506                                              &junk, &junk);
507                 if (retv)
508                         goto done;
509 update:
510                 retv = 0;
511                 opt = ipv6_update_options(sk, opt);
512 done:
513                 if (opt) {
514                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
515                         txopt_put(opt);
516                 }
517                 break;
518         }
519         case IPV6_UNICAST_HOPS:
520                 if (optlen < sizeof(int))
521                         goto e_inval;
522                 if (val > 255 || val < -1)
523                         goto e_inval;
524                 np->hop_limit = val;
525                 retv = 0;
526                 break;
527 
528         case IPV6_MULTICAST_HOPS:
529                 if (sk->sk_type == SOCK_STREAM)
530                         break;
531                 if (optlen < sizeof(int))
532                         goto e_inval;
533                 if (val > 255 || val < -1)
534                         goto e_inval;
535                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
536                 retv = 0;
537                 break;
538 
539         case IPV6_MULTICAST_LOOP:
540                 if (optlen < sizeof(int))
541                         goto e_inval;
542                 if (val != valbool)
543                         goto e_inval;
544                 np->mc_loop = valbool;
545                 retv = 0;
546                 break;
547 
548         case IPV6_UNICAST_IF:
549         {
550                 struct net_device *dev = NULL;
551                 int ifindex;
552 
553                 if (optlen != sizeof(int))
554                         goto e_inval;
555 
556                 ifindex = (__force int)ntohl((__force __be32)val);
557                 if (ifindex == 0) {
558                         np->ucast_oif = 0;
559                         retv = 0;
560                         break;
561                 }
562 
563                 dev = dev_get_by_index(net, ifindex);
564                 retv = -EADDRNOTAVAIL;
565                 if (!dev)
566                         break;
567                 dev_put(dev);
568 
569                 retv = -EINVAL;
570                 if (sk->sk_bound_dev_if)
571                         break;
572 
573                 np->ucast_oif = ifindex;
574                 retv = 0;
575                 break;
576         }
577 
578         case IPV6_MULTICAST_IF:
579                 if (sk->sk_type == SOCK_STREAM)
580                         break;
581                 if (optlen < sizeof(int))
582                         goto e_inval;
583 
584                 if (val) {
585                         struct net_device *dev;
586 
587                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
588                                 goto e_inval;
589 
590                         dev = dev_get_by_index(net, val);
591                         if (!dev) {
592                                 retv = -ENODEV;
593                                 break;
594                         }
595                         dev_put(dev);
596                 }
597                 np->mcast_oif = val;
598                 retv = 0;
599                 break;
600         case IPV6_ADD_MEMBERSHIP:
601         case IPV6_DROP_MEMBERSHIP:
602         {
603                 struct ipv6_mreq mreq;
604 
605                 if (optlen < sizeof(struct ipv6_mreq))
606                         goto e_inval;
607 
608                 retv = -EPROTO;
609                 if (inet_sk(sk)->is_icsk)
610                         break;
611 
612                 retv = -EFAULT;
613                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
614                         break;
615 
616                 if (optname == IPV6_ADD_MEMBERSHIP)
617                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
618                 else
619                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
620                 break;
621         }
622         case IPV6_JOIN_ANYCAST:
623         case IPV6_LEAVE_ANYCAST:
624         {
625                 struct ipv6_mreq mreq;
626 
627                 if (optlen < sizeof(struct ipv6_mreq))
628                         goto e_inval;
629 
630                 retv = -EFAULT;
631                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
632                         break;
633 
634                 if (optname == IPV6_JOIN_ANYCAST)
635                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
636                 else
637                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
638                 break;
639         }
640         case MCAST_JOIN_GROUP:
641         case MCAST_LEAVE_GROUP:
642         {
643                 struct group_req greq;
644                 struct sockaddr_in6 *psin6;
645 
646                 if (optlen < sizeof(struct group_req))
647                         goto e_inval;
648 
649                 retv = -EFAULT;
650                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
651                         break;
652                 if (greq.gr_group.ss_family != AF_INET6) {
653                         retv = -EADDRNOTAVAIL;
654                         break;
655                 }
656                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
657                 if (optname == MCAST_JOIN_GROUP)
658                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
659                                                  &psin6->sin6_addr);
660                 else
661                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
662                                                  &psin6->sin6_addr);
663                 break;
664         }
665         case MCAST_JOIN_SOURCE_GROUP:
666         case MCAST_LEAVE_SOURCE_GROUP:
667         case MCAST_BLOCK_SOURCE:
668         case MCAST_UNBLOCK_SOURCE:
669         {
670                 struct group_source_req greqs;
671                 int omode, add;
672 
673                 if (optlen < sizeof(struct group_source_req))
674                         goto e_inval;
675                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
676                         retv = -EFAULT;
677                         break;
678                 }
679                 if (greqs.gsr_group.ss_family != AF_INET6 ||
680                     greqs.gsr_source.ss_family != AF_INET6) {
681                         retv = -EADDRNOTAVAIL;
682                         break;
683                 }
684                 if (optname == MCAST_BLOCK_SOURCE) {
685                         omode = MCAST_EXCLUDE;
686                         add = 1;
687                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
688                         omode = MCAST_EXCLUDE;
689                         add = 0;
690                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
691                         struct sockaddr_in6 *psin6;
692 
693                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
694                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
695                                                  &psin6->sin6_addr);
696                         /* prior join w/ different source is ok */
697                         if (retv && retv != -EADDRINUSE)
698                                 break;
699                         omode = MCAST_INCLUDE;
700                         add = 1;
701                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
702                         omode = MCAST_INCLUDE;
703                         add = 0;
704                 }
705                 retv = ip6_mc_source(add, omode, sk, &greqs);
706                 break;
707         }
708         case MCAST_MSFILTER:
709         {
710                 struct group_filter *gsf;
711 
712                 if (optlen < GROUP_FILTER_SIZE(0))
713                         goto e_inval;
714                 if (optlen > sysctl_optmem_max) {
715                         retv = -ENOBUFS;
716                         break;
717                 }
718                 gsf = kmalloc(optlen, GFP_KERNEL);
719                 if (!gsf) {
720                         retv = -ENOBUFS;
721                         break;
722                 }
723                 retv = -EFAULT;
724                 if (copy_from_user(gsf, optval, optlen)) {
725                         kfree(gsf);
726                         break;
727                 }
728                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
729                 if (gsf->gf_numsrc >= 0x1ffffffU ||
730                     gsf->gf_numsrc > sysctl_mld_max_msf) {
731                         kfree(gsf);
732                         retv = -ENOBUFS;
733                         break;
734                 }
735                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
736                         kfree(gsf);
737                         retv = -EINVAL;
738                         break;
739                 }
740                 retv = ip6_mc_msfilter(sk, gsf);
741                 kfree(gsf);
742 
743                 break;
744         }
745         case IPV6_ROUTER_ALERT:
746                 if (optlen < sizeof(int))
747                         goto e_inval;
748                 retv = ip6_ra_control(sk, val);
749                 break;
750         case IPV6_MTU_DISCOVER:
751                 if (optlen < sizeof(int))
752                         goto e_inval;
753                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
754                         goto e_inval;
755                 np->pmtudisc = val;
756                 retv = 0;
757                 break;
758         case IPV6_MTU:
759                 if (optlen < sizeof(int))
760                         goto e_inval;
761                 if (val && val < IPV6_MIN_MTU)
762                         goto e_inval;
763                 np->frag_size = val;
764                 retv = 0;
765                 break;
766         case IPV6_RECVERR:
767                 if (optlen < sizeof(int))
768                         goto e_inval;
769                 np->recverr = valbool;
770                 if (!val)
771                         skb_queue_purge(&sk->sk_error_queue);
772                 retv = 0;
773                 break;
774         case IPV6_FLOWINFO_SEND:
775                 if (optlen < sizeof(int))
776                         goto e_inval;
777                 np->sndflow = valbool;
778                 retv = 0;
779                 break;
780         case IPV6_FLOWLABEL_MGR:
781                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
782                 break;
783         case IPV6_IPSEC_POLICY:
784         case IPV6_XFRM_POLICY:
785                 retv = -EPERM;
786                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
787                         break;
788                 retv = xfrm_user_policy(sk, optname, optval, optlen);
789                 break;
790 
791         case IPV6_ADDR_PREFERENCES:
792             {
793                 unsigned int pref = 0;
794                 unsigned int prefmask = ~0;
795 
796                 if (optlen < sizeof(int))
797                         goto e_inval;
798 
799                 retv = -EINVAL;
800 
801                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
802                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
803                                IPV6_PREFER_SRC_TMP|
804                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
805                 case IPV6_PREFER_SRC_PUBLIC:
806                         pref |= IPV6_PREFER_SRC_PUBLIC;
807                         break;
808                 case IPV6_PREFER_SRC_TMP:
809                         pref |= IPV6_PREFER_SRC_TMP;
810                         break;
811                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
812                         break;
813                 case 0:
814                         goto pref_skip_pubtmp;
815                 default:
816                         goto e_inval;
817                 }
818 
819                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
820                               IPV6_PREFER_SRC_TMP);
821 pref_skip_pubtmp:
822 
823                 /* check HOME/COA conflicts */
824                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
825                 case IPV6_PREFER_SRC_HOME:
826                         break;
827                 case IPV6_PREFER_SRC_COA:
828                         pref |= IPV6_PREFER_SRC_COA;
829                 case 0:
830                         goto pref_skip_coa;
831                 default:
832                         goto e_inval;
833                 }
834 
835                 prefmask &= ~IPV6_PREFER_SRC_COA;
836 pref_skip_coa:
837 
838                 /* check CGA/NONCGA conflicts */
839                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
840                 case IPV6_PREFER_SRC_CGA:
841                 case IPV6_PREFER_SRC_NONCGA:
842                 case 0:
843                         break;
844                 default:
845                         goto e_inval;
846                 }
847 
848                 np->srcprefs = (np->srcprefs & prefmask) | pref;
849                 retv = 0;
850 
851                 break;
852             }
853         case IPV6_MINHOPCOUNT:
854                 if (optlen < sizeof(int))
855                         goto e_inval;
856                 if (val < 0 || val > 255)
857                         goto e_inval;
858                 np->min_hopcount = val;
859                 retv = 0;
860                 break;
861         case IPV6_DONTFRAG:
862                 np->dontfrag = valbool;
863                 retv = 0;
864                 break;
865         case IPV6_AUTOFLOWLABEL:
866                 np->autoflowlabel = valbool;
867                 retv = 0;
868                 break;
869         }
870 
871         release_sock(sk);
872         if (needs_rtnl)
873                 rtnl_unlock();
874 
875         return retv;
876 
877 e_inval:
878         release_sock(sk);
879         if (needs_rtnl)
880                 rtnl_unlock();
881         return -EINVAL;
882 }
883 
884 int ipv6_setsockopt(struct sock *sk, int level, int optname,
885                     char __user *optval, unsigned int optlen)
886 {
887         int err;
888 
889         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
890                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
891 
892         if (level != SOL_IPV6)
893                 return -ENOPROTOOPT;
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 = nf_setsockopt(sk, PF_INET6, optname, optval,
902                                 optlen);
903                 release_sock(sk);
904         }
905 #endif
906         return err;
907 }
908 EXPORT_SYMBOL(ipv6_setsockopt);
909 
910 #ifdef CONFIG_COMPAT
911 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
912                            char __user *optval, unsigned int optlen)
913 {
914         int err;
915 
916         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
917                 if (udp_prot.compat_setsockopt != NULL)
918                         return udp_prot.compat_setsockopt(sk, level, optname,
919                                                           optval, optlen);
920                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
921         }
922 
923         if (level != SOL_IPV6)
924                 return -ENOPROTOOPT;
925 
926         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
927                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
928                         ipv6_setsockopt);
929 
930         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
931 #ifdef CONFIG_NETFILTER
932         /* we need to exclude all possible ENOPROTOOPTs except default case */
933         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
934             optname != IPV6_XFRM_POLICY) {
935                 lock_sock(sk);
936                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
937                                            optval, optlen);
938                 release_sock(sk);
939         }
940 #endif
941         return err;
942 }
943 EXPORT_SYMBOL(compat_ipv6_setsockopt);
944 #endif
945 
946 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
947                                   int optname, char __user *optval, int len)
948 {
949         struct ipv6_opt_hdr *hdr;
950 
951         if (!opt)
952                 return 0;
953 
954         switch (optname) {
955         case IPV6_HOPOPTS:
956                 hdr = opt->hopopt;
957                 break;
958         case IPV6_RTHDRDSTOPTS:
959                 hdr = opt->dst0opt;
960                 break;
961         case IPV6_RTHDR:
962                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
963                 break;
964         case IPV6_DSTOPTS:
965                 hdr = opt->dst1opt;
966                 break;
967         default:
968                 return -EINVAL; /* should not happen */
969         }
970 
971         if (!hdr)
972                 return 0;
973 
974         len = min_t(unsigned int, len, ipv6_optlen(hdr));
975         if (copy_to_user(optval, hdr, len))
976                 return -EFAULT;
977         return len;
978 }
979 
980 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
981                     char __user *optval, int __user *optlen, unsigned int flags)
982 {
983         struct ipv6_pinfo *np = inet6_sk(sk);
984         int len;
985         int val;
986 
987         if (ip6_mroute_opt(optname))
988                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
989 
990         if (get_user(len, optlen))
991                 return -EFAULT;
992         switch (optname) {
993         case IPV6_ADDRFORM:
994                 if (sk->sk_protocol != IPPROTO_UDP &&
995                     sk->sk_protocol != IPPROTO_UDPLITE &&
996                     sk->sk_protocol != IPPROTO_TCP)
997                         return -ENOPROTOOPT;
998                 if (sk->sk_state != TCP_ESTABLISHED)
999                         return -ENOTCONN;
1000                 val = sk->sk_family;
1001                 break;
1002         case MCAST_MSFILTER:
1003         {
1004                 struct group_filter gsf;
1005                 int err;
1006 
1007                 if (len < GROUP_FILTER_SIZE(0))
1008                         return -EINVAL;
1009                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1010                         return -EFAULT;
1011                 if (gsf.gf_group.ss_family != AF_INET6)
1012                         return -EADDRNOTAVAIL;
1013                 lock_sock(sk);
1014                 err = ip6_mc_msfget(sk, &gsf,
1015                         (struct group_filter __user *)optval, optlen);
1016                 release_sock(sk);
1017                 return err;
1018         }
1019 
1020         case IPV6_2292PKTOPTIONS:
1021         {
1022                 struct msghdr msg;
1023                 struct sk_buff *skb;
1024 
1025                 if (sk->sk_type != SOCK_STREAM)
1026                         return -ENOPROTOOPT;
1027 
1028                 msg.msg_control = optval;
1029                 msg.msg_controllen = len;
1030                 msg.msg_flags = flags;
1031 
1032                 lock_sock(sk);
1033                 skb = np->pktoptions;
1034                 if (skb)
1035                         ip6_datagram_recv_ctl(sk, &msg, skb);
1036                 release_sock(sk);
1037                 if (!skb) {
1038                         if (np->rxopt.bits.rxinfo) {
1039                                 struct in6_pktinfo src_info;
1040                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1041                                         np->sticky_pktinfo.ipi6_ifindex;
1042                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1043                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1044                         }
1045                         if (np->rxopt.bits.rxhlim) {
1046                                 int hlim = np->mcast_hops;
1047                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1048                         }
1049                         if (np->rxopt.bits.rxtclass) {
1050                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1051 
1052                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1053                         }
1054                         if (np->rxopt.bits.rxoinfo) {
1055                                 struct in6_pktinfo src_info;
1056                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1057                                         np->sticky_pktinfo.ipi6_ifindex;
1058                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1059                                                                      np->sticky_pktinfo.ipi6_addr;
1060                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1061                         }
1062                         if (np->rxopt.bits.rxohlim) {
1063                                 int hlim = np->mcast_hops;
1064                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1065                         }
1066                         if (np->rxopt.bits.rxflow) {
1067                                 __be32 flowinfo = np->rcv_flowinfo;
1068 
1069                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1070                         }
1071                 }
1072                 len -= msg.msg_controllen;
1073                 return put_user(len, optlen);
1074         }
1075         case IPV6_MTU:
1076         {
1077                 struct dst_entry *dst;
1078 
1079                 val = 0;
1080                 rcu_read_lock();
1081                 dst = __sk_dst_get(sk);
1082                 if (dst)
1083                         val = dst_mtu(dst);
1084                 rcu_read_unlock();
1085                 if (!val)
1086                         return -ENOTCONN;
1087                 break;
1088         }
1089 
1090         case IPV6_V6ONLY:
1091                 val = sk->sk_ipv6only;
1092                 break;
1093 
1094         case IPV6_RECVPKTINFO:
1095                 val = np->rxopt.bits.rxinfo;
1096                 break;
1097 
1098         case IPV6_2292PKTINFO:
1099                 val = np->rxopt.bits.rxoinfo;
1100                 break;
1101 
1102         case IPV6_RECVHOPLIMIT:
1103                 val = np->rxopt.bits.rxhlim;
1104                 break;
1105 
1106         case IPV6_2292HOPLIMIT:
1107                 val = np->rxopt.bits.rxohlim;
1108                 break;
1109 
1110         case IPV6_RECVRTHDR:
1111                 val = np->rxopt.bits.srcrt;
1112                 break;
1113 
1114         case IPV6_2292RTHDR:
1115                 val = np->rxopt.bits.osrcrt;
1116                 break;
1117 
1118         case IPV6_HOPOPTS:
1119         case IPV6_RTHDRDSTOPTS:
1120         case IPV6_RTHDR:
1121         case IPV6_DSTOPTS:
1122         {
1123                 struct ipv6_txoptions *opt;
1124 
1125                 lock_sock(sk);
1126                 opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk));
1127                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1128                 release_sock(sk);
1129                 /* check if ipv6_getsockopt_sticky() returns err code */
1130                 if (len < 0)
1131                         return len;
1132                 return put_user(len, optlen);
1133         }
1134 
1135         case IPV6_RECVHOPOPTS:
1136                 val = np->rxopt.bits.hopopts;
1137                 break;
1138 
1139         case IPV6_2292HOPOPTS:
1140                 val = np->rxopt.bits.ohopopts;
1141                 break;
1142 
1143         case IPV6_RECVDSTOPTS:
1144                 val = np->rxopt.bits.dstopts;
1145                 break;
1146 
1147         case IPV6_2292DSTOPTS:
1148                 val = np->rxopt.bits.odstopts;
1149                 break;
1150 
1151         case IPV6_TCLASS:
1152                 val = np->tclass;
1153                 break;
1154 
1155         case IPV6_RECVTCLASS:
1156                 val = np->rxopt.bits.rxtclass;
1157                 break;
1158 
1159         case IPV6_FLOWINFO:
1160                 val = np->rxopt.bits.rxflow;
1161                 break;
1162 
1163         case IPV6_RECVPATHMTU:
1164                 val = np->rxopt.bits.rxpmtu;
1165                 break;
1166 
1167         case IPV6_PATHMTU:
1168         {
1169                 struct dst_entry *dst;
1170                 struct ip6_mtuinfo mtuinfo;
1171 
1172                 if (len < sizeof(mtuinfo))
1173                         return -EINVAL;
1174 
1175                 len = sizeof(mtuinfo);
1176                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1177 
1178                 rcu_read_lock();
1179                 dst = __sk_dst_get(sk);
1180                 if (dst)
1181                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1182                 rcu_read_unlock();
1183                 if (!mtuinfo.ip6m_mtu)
1184                         return -ENOTCONN;
1185 
1186                 if (put_user(len, optlen))
1187                         return -EFAULT;
1188                 if (copy_to_user(optval, &mtuinfo, len))
1189                         return -EFAULT;
1190 
1191                 return 0;
1192         }
1193 
1194         case IPV6_TRANSPARENT:
1195                 val = inet_sk(sk)->transparent;
1196                 break;
1197 
1198         case IPV6_RECVORIGDSTADDR:
1199                 val = np->rxopt.bits.rxorigdstaddr;
1200                 break;
1201 
1202         case IPV6_UNICAST_HOPS:
1203         case IPV6_MULTICAST_HOPS:
1204         {
1205                 struct dst_entry *dst;
1206 
1207                 if (optname == IPV6_UNICAST_HOPS)
1208                         val = np->hop_limit;
1209                 else
1210                         val = np->mcast_hops;
1211 
1212                 if (val < 0) {
1213                         rcu_read_lock();
1214                         dst = __sk_dst_get(sk);
1215                         if (dst)
1216                                 val = ip6_dst_hoplimit(dst);
1217                         rcu_read_unlock();
1218                 }
1219 
1220                 if (val < 0)
1221                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1222                 break;
1223         }
1224 
1225         case IPV6_MULTICAST_LOOP:
1226                 val = np->mc_loop;
1227                 break;
1228 
1229         case IPV6_MULTICAST_IF:
1230                 val = np->mcast_oif;
1231                 break;
1232 
1233         case IPV6_UNICAST_IF:
1234                 val = (__force int)htonl((__u32) np->ucast_oif);
1235                 break;
1236 
1237         case IPV6_MTU_DISCOVER:
1238                 val = np->pmtudisc;
1239                 break;
1240 
1241         case IPV6_RECVERR:
1242                 val = np->recverr;
1243                 break;
1244 
1245         case IPV6_FLOWINFO_SEND:
1246                 val = np->sndflow;
1247                 break;
1248 
1249         case IPV6_FLOWLABEL_MGR:
1250         {
1251                 struct in6_flowlabel_req freq;
1252                 int flags;
1253 
1254                 if (len < sizeof(freq))
1255                         return -EINVAL;
1256 
1257                 if (copy_from_user(&freq, optval, sizeof(freq)))
1258                         return -EFAULT;
1259 
1260                 if (freq.flr_action != IPV6_FL_A_GET)
1261                         return -EINVAL;
1262 
1263                 len = sizeof(freq);
1264                 flags = freq.flr_flags;
1265 
1266                 memset(&freq, 0, sizeof(freq));
1267 
1268                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1269                 if (val < 0)
1270                         return val;
1271 
1272                 if (put_user(len, optlen))
1273                         return -EFAULT;
1274                 if (copy_to_user(optval, &freq, len))
1275                         return -EFAULT;
1276 
1277                 return 0;
1278         }
1279 
1280         case IPV6_ADDR_PREFERENCES:
1281                 val = 0;
1282 
1283                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1284                         val |= IPV6_PREFER_SRC_TMP;
1285                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1286                         val |= IPV6_PREFER_SRC_PUBLIC;
1287                 else {
1288                         /* XXX: should we return system default? */
1289                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1290                 }
1291 
1292                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1293                         val |= IPV6_PREFER_SRC_COA;
1294                 else
1295                         val |= IPV6_PREFER_SRC_HOME;
1296                 break;
1297 
1298         case IPV6_MINHOPCOUNT:
1299                 val = np->min_hopcount;
1300                 break;
1301 
1302         case IPV6_DONTFRAG:
1303                 val = np->dontfrag;
1304                 break;
1305 
1306         case IPV6_AUTOFLOWLABEL:
1307                 val = np->autoflowlabel;
1308                 break;
1309 
1310         default:
1311                 return -ENOPROTOOPT;
1312         }
1313         len = min_t(unsigned int, sizeof(int), len);
1314         if (put_user(len, optlen))
1315                 return -EFAULT;
1316         if (copy_to_user(optval, &val, len))
1317                 return -EFAULT;
1318         return 0;
1319 }
1320 
1321 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1322                     char __user *optval, int __user *optlen)
1323 {
1324         int err;
1325 
1326         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1327                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1328 
1329         if (level != SOL_IPV6)
1330                 return -ENOPROTOOPT;
1331 
1332         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1333 #ifdef CONFIG_NETFILTER
1334         /* we need to exclude all possible ENOPROTOOPTs except default case */
1335         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1336                 int len;
1337 
1338                 if (get_user(len, optlen))
1339                         return -EFAULT;
1340 
1341                 lock_sock(sk);
1342                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1343                                 &len);
1344                 release_sock(sk);
1345                 if (err >= 0)
1346                         err = put_user(len, optlen);
1347         }
1348 #endif
1349         return err;
1350 }
1351 EXPORT_SYMBOL(ipv6_getsockopt);
1352 
1353 #ifdef CONFIG_COMPAT
1354 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1355                            char __user *optval, int __user *optlen)
1356 {
1357         int err;
1358 
1359         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1360                 if (udp_prot.compat_getsockopt != NULL)
1361                         return udp_prot.compat_getsockopt(sk, level, optname,
1362                                                           optval, optlen);
1363                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1364         }
1365 
1366         if (level != SOL_IPV6)
1367                 return -ENOPROTOOPT;
1368 
1369         if (optname == MCAST_MSFILTER)
1370                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1371                         ipv6_getsockopt);
1372 
1373         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1374                                  MSG_CMSG_COMPAT);
1375 #ifdef CONFIG_NETFILTER
1376         /* we need to exclude all possible ENOPROTOOPTs except default case */
1377         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1378                 int len;
1379 
1380                 if (get_user(len, optlen))
1381                         return -EFAULT;
1382 
1383                 lock_sock(sk);
1384                 err = compat_nf_getsockopt(sk, PF_INET6,
1385                                            optname, optval, &len);
1386                 release_sock(sk);
1387                 if (err >= 0)
1388                         err = put_user(len, optlen);
1389         }
1390 #endif
1391         return err;
1392 }
1393 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1394 #endif
1395 
1396 

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