net/ipv6/ipv6_sockglue.c

   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