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         }
 114         opt = xchg(&inet6_sk(sk)->opt, opt);
 115         sk_dst_reset(sk);
 116
 117         return opt;
 118 }
 119
 120 static bool setsockopt_needs_rtnl(int optname)
 121 {
 122         switch (optname) {
 123         case IPV6_ADD_MEMBERSHIP:
 124         case IPV6_DROP_MEMBERSHIP:
 125         case MCAST_JOIN_GROUP:
 126         case MCAST_LEAVE_GROUP:
 127                 return true;
 128         }
 129         return false;
 130 }
 131
 132 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 133                     char __user *optval, unsigned int optlen)
 134 {
 135         struct ipv6_pinfo *np = inet6_sk(sk);
 136         struct net *net = sock_net(sk);
 137         int val, valbool;
 138         int retv = -ENOPROTOOPT;
 139         bool needs_rtnl = setsockopt_needs_rtnl(optname);
 140
 141         if (optval == NULL)
 142                 val = 0;
 143         else {
 144                 if (optlen >= sizeof(int)) {
 145                         if (get_user(val, (int __user *) optval))
 146                                 return -EFAULT;
 147                 } else
 148                         val = 0;
 149         }
 150
 151         valbool = (val != 0);
 152
 153         if (ip6_mroute_opt(optname))
 154                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 155
 156         if (needs_rtnl)
 157                 rtnl_lock();
 158         lock_sock(sk);
 159
 160         switch (optname) {
 161
 162         case IPV6_ADDRFORM:
 163                 if (optlen < sizeof(int))
 164                         goto e_inval;
 165                 if (val == PF_INET) {
 166                         struct ipv6_txoptions *opt;
 167                         struct sk_buff *pktopt;
 168
 169                         if (sk->sk_type == SOCK_RAW)
 170                                 break;
 171
 172                         if (sk->sk_protocol == IPPROTO_UDP ||
 173                             sk->sk_protocol == IPPROTO_UDPLITE) {
 174                                 struct udp_sock *up = udp_sk(sk);
 175                                 if (up->pending == AF_INET6) {
 176                                         retv = -EBUSY;
 177                                         break;
 178                                 }
 179                         } else if (sk->sk_protocol != IPPROTO_TCP)
 180                                 break;
 181
 182                         if (sk->sk_state != TCP_ESTABLISHED) {
 183                                 retv = -ENOTCONN;
 184                                 break;
 185                         }
 186
 187                         if (ipv6_only_sock(sk) ||
 188                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 189                                 retv = -EADDRNOTAVAIL;
 190                                 break;
 191                         }
 192
 193                         fl6_free_socklist(sk);
 194                         ipv6_sock_mc_close(sk);
 195
 196                         /*
 197                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 198                          * remove it from the refcnt debug socks count in the
 199                          * original family...
 200                          */
 201                         sk_refcnt_debug_dec(sk);
 202
 203                         if (sk->sk_protocol == IPPROTO_TCP) {
 204                                 struct inet_connection_sock *icsk = inet_csk(sk);
 205                                 local_bh_disable();
 206                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 207                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 208                                 local_bh_enable();
 209                                 sk->sk_prot = &tcp_prot;
 210                                 icsk->icsk_af_ops = &ipv4_specific;
 211                                 sk->sk_socket->ops = &inet_stream_ops;
 212                                 sk->sk_family = PF_INET;
 213                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 214                         } else {
 215                                 struct proto *prot = &udp_prot;
 216
 217                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 218                                         prot = &udplite_prot;
 219                                 local_bh_disable();
 220                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 221                                 sock_prot_inuse_add(net, prot, 1);
 222                                 local_bh_enable();
 223                                 sk->sk_prot = prot;
 224                                 sk->sk_socket->ops = &inet_dgram_ops;
 225                                 sk->sk_family = PF_INET;
 226                         }
 227                         opt = xchg(&np->opt, NULL);
 228                         if (opt)
 229                                 sock_kfree_s(sk, opt, opt->tot_len);
 230                         pktopt = xchg(&np->pktoptions, NULL);
 231                         kfree_skb(pktopt);
 232
 233                         sk->sk_destruct = inet_sock_destruct;
 234                         /*
 235                          * ... and add it to the refcnt debug socks count
 236                          * in the new family. -acme
 237                          */
 238                         sk_refcnt_debug_inc(sk);
 239                         module_put(THIS_MODULE);
 240                         retv = 0;
 241                         break;
 242                 }
 243                 goto e_inval;
 244
 245         case IPV6_V6ONLY:
 246                 if (optlen < sizeof(int) ||
 247                     inet_sk(sk)->inet_num)
 248                         goto e_inval;
 249                 sk->sk_ipv6only = valbool;
 250                 retv = 0;
 251                 break;
 252
 253         case IPV6_RECVPKTINFO:
 254                 if (optlen < sizeof(int))
 255                         goto e_inval;
 256                 np->rxopt.bits.rxinfo = valbool;
 257                 retv = 0;
 258                 break;
 259
 260         case IPV6_2292PKTINFO:
 261                 if (optlen < sizeof(int))
 262                         goto e_inval;
 263                 np->rxopt.bits.rxoinfo = valbool;
 264                 retv = 0;
 265                 break;
 266
 267         case IPV6_RECVHOPLIMIT:
 268                 if (optlen < sizeof(int))
 269                         goto e_inval;
 270                 np->rxopt.bits.rxhlim = valbool;
 271                 retv = 0;
 272                 break;
 273
 274         case IPV6_2292HOPLIMIT:
 275                 if (optlen < sizeof(int))
 276                         goto e_inval;
 277                 np->rxopt.bits.rxohlim = valbool;
 278                 retv = 0;
 279                 break;
 280
 281         case IPV6_RECVRTHDR:
 282                 if (optlen < sizeof(int))
 283                         goto e_inval;
 284                 np->rxopt.bits.srcrt = valbool;
 285                 retv = 0;
 286                 break;
 287
 288         case IPV6_2292RTHDR:
 289                 if (optlen < sizeof(int))
 290                         goto e_inval;
 291                 np->rxopt.bits.osrcrt = valbool;
 292                 retv = 0;
 293                 break;
 294
 295         case IPV6_RECVHOPOPTS:
 296                 if (optlen < sizeof(int))
 297                         goto e_inval;
 298                 np->rxopt.bits.hopopts = valbool;
 299                 retv = 0;
 300                 break;
 301
 302         case IPV6_2292HOPOPTS:
 303                 if (optlen < sizeof(int))
 304                         goto e_inval;
 305                 np->rxopt.bits.ohopopts = valbool;
 306                 retv = 0;
 307                 break;
 308
 309         case IPV6_RECVDSTOPTS:
 310                 if (optlen < sizeof(int))
 311                         goto e_inval;
 312                 np->rxopt.bits.dstopts = valbool;
 313                 retv = 0;
 314                 break;
 315
 316         case IPV6_2292DSTOPTS:
 317                 if (optlen < sizeof(int))
 318                         goto e_inval;
 319                 np->rxopt.bits.odstopts = valbool;
 320                 retv = 0;
 321                 break;
 322
 323         case IPV6_TCLASS:
 324                 if (optlen < sizeof(int))
 325                         goto e_inval;
 326                 if (val < -1 || val > 0xff)
 327                         goto e_inval;
 328                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 329                 if (val == -1)
 330                         val = 0;
 331                 np->tclass = val;
 332                 retv = 0;
 333                 break;
 334
 335         case IPV6_RECVTCLASS:
 336                 if (optlen < sizeof(int))
 337                         goto e_inval;
 338                 np->rxopt.bits.rxtclass = valbool;
 339                 retv = 0;
 340                 break;
 341
 342         case IPV6_FLOWINFO:
 343                 if (optlen < sizeof(int))
 344                         goto e_inval;
 345                 np->rxopt.bits.rxflow = valbool;
 346                 retv = 0;
 347                 break;
 348
 349         case IPV6_RECVPATHMTU:
 350                 if (optlen < sizeof(int))
 351                         goto e_inval;
 352                 np->rxopt.bits.rxpmtu = valbool;
 353                 retv = 0;
 354                 break;
 355
 356         case IPV6_TRANSPARENT:
 357                 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 358                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 359                         retv = -EPERM;
 360                         break;
 361                 }
 362                 if (optlen < sizeof(int))
 363                         goto e_inval;
 364                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 365                 inet_sk(sk)->transparent = valbool;
 366                 retv = 0;
 367                 break;
 368
 369         case IPV6_RECVORIGDSTADDR:
 370                 if (optlen < sizeof(int))
 371                         goto e_inval;
 372                 np->rxopt.bits.rxorigdstaddr = valbool;
 373                 retv = 0;
 374                 break;
 375
 376         case IPV6_HOPOPTS:
 377         case IPV6_RTHDRDSTOPTS:
 378         case IPV6_RTHDR:
 379         case IPV6_DSTOPTS:
 380         {
 381                 struct ipv6_txoptions *opt;
 382
 383                 /* remove any sticky options header with a zero option
 384                  * length, per RFC3542.
 385                  */
 386                 if (optlen == 0)
 387                         optval = NULL;
 388                 else if (optval == NULL)
 389                         goto e_inval;
 390                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 391                          optlen & 0x7 || optlen > 8 * 255)
 392                         goto e_inval;
 393
 394                 /* hop-by-hop / destination options are privileged option */
 395                 retv = -EPERM;
 396                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 397                         break;
 398
 399                 opt = ipv6_renew_options(sk, np->opt, optname,
 400                                          (struct ipv6_opt_hdr __user *)optval,
 401                                          optlen);
 402                 if (IS_ERR(opt)) {
 403                         retv = PTR_ERR(opt);
 404                         break;
 405                 }
 406
 407                 /* routing header option needs extra check */
 408                 retv = -EINVAL;
 409                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 410                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 411                         switch (rthdr->type) {
 412 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 413                         case IPV6_SRCRT_TYPE_2:
 414                                 if (rthdr->hdrlen != 2 ||
 415                                     rthdr->segments_left != 1)
 416                                         goto sticky_done;
 417
 418                                 break;
 419 #endif
 420                         default:
 421                                 goto sticky_done;
 422                         }
 423                 }
 424
 425                 retv = 0;
 426                 opt = ipv6_update_options(sk, opt);
 427 sticky_done:
 428                 if (opt)
 429                         sock_kfree_s(sk, opt, opt->tot_len);
 430                 break;
 431         }
 432
 433         case IPV6_PKTINFO:
 434         {
 435                 struct in6_pktinfo pkt;
 436
 437                 if (optlen == 0)
 438                         goto e_inval;
 439                 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
 440                         goto e_inval;
 441
 442                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 443                                 retv = -EFAULT;
 444                                 break;
 445                 }
 446                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 447                         goto e_inval;
 448
 449                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 450                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 451                 retv = 0;
 452                 break;
 453         }
 454
 455         case IPV6_2292PKTOPTIONS:
 456         {
 457                 struct ipv6_txoptions *opt = NULL;
 458                 struct msghdr msg;
 459                 struct flowi6 fl6;
 460                 int junk;
 461
 462                 memset(&fl6, 0, sizeof(fl6));
 463                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 464                 fl6.flowi6_mark = sk->sk_mark;
 465
 466                 if (optlen == 0)
 467                         goto update;
 468
 469                 /* 1K is probably excessive
 470                  * 1K is surely not enough, 2K per standard header is 16K.
 471                  */
 472                 retv = -EINVAL;
 473                 if (optlen > 64*1024)
 474                         break;
 475
 476                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 477                 retv = -ENOBUFS;
 478                 if (opt == NULL)
 479                         break;
 480
 481                 memset(opt, 0, sizeof(*opt));
 482                 opt->tot_len = sizeof(*opt) + optlen;
 483                 retv = -EFAULT;
 484                 if (copy_from_user(opt+1, optval, optlen))
 485                         goto done;
 486
 487                 msg.msg_controllen = optlen;
 488                 msg.msg_control = (void *)(opt+1);
 489
 490                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk,
 491                                              &junk, &junk);
 492                 if (retv)
 493                         goto done;
 494 update:
 495                 retv = 0;
 496                 opt = ipv6_update_options(sk, opt);
 497 done:
 498                 if (opt)
 499                         sock_kfree_s(sk, opt, opt->tot_len);
 500                 break;
 501         }
 502         case IPV6_UNICAST_HOPS:
 503                 if (optlen < sizeof(int))
 504                         goto e_inval;
 505                 if (val > 255 || val < -1)
 506                         goto e_inval;
 507                 np->hop_limit = val;
 508                 retv = 0;
 509                 break;
 510
 511         case IPV6_MULTICAST_HOPS:
 512                 if (sk->sk_type == SOCK_STREAM)
 513                         break;
 514                 if (optlen < sizeof(int))
 515                         goto e_inval;
 516                 if (val > 255 || val < -1)
 517                         goto e_inval;
 518                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 519                 retv = 0;
 520                 break;
 521
 522         case IPV6_MULTICAST_LOOP:
 523                 if (optlen < sizeof(int))
 524                         goto e_inval;
 525                 if (val != valbool)
 526                         goto e_inval;
 527                 np->mc_loop = valbool;
 528                 retv = 0;
 529                 break;
 530
 531         case IPV6_UNICAST_IF:
 532         {
 533                 struct net_device *dev = NULL;
 534                 int ifindex;
 535
 536                 if (optlen != sizeof(int))
 537                         goto e_inval;
 538
 539                 ifindex = (__force int)ntohl((__force __be32)val);
 540                 if (ifindex == 0) {
 541                         np->ucast_oif = 0;
 542                         retv = 0;
 543                         break;
 544                 }
 545
 546                 dev = dev_get_by_index(net, ifindex);
 547                 retv = -EADDRNOTAVAIL;
 548                 if (!dev)
 549                         break;
 550                 dev_put(dev);
 551
 552                 retv = -EINVAL;
 553                 if (sk->sk_bound_dev_if)
 554                         break;
 555
 556                 np->ucast_oif = ifindex;
 557                 retv = 0;
 558                 break;
 559         }
 560
 561         case IPV6_MULTICAST_IF:
 562                 if (sk->sk_type == SOCK_STREAM)
 563                         break;
 564                 if (optlen < sizeof(int))
 565                         goto e_inval;
 566
 567                 if (val) {
 568                         struct net_device *dev;
 569
 570                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 571                                 goto e_inval;
 572
 573                         dev = dev_get_by_index(net, val);
 574                         if (!dev) {
 575                                 retv = -ENODEV;
 576                                 break;
 577                         }
 578                         dev_put(dev);
 579                 }
 580                 np->mcast_oif = val;
 581                 retv = 0;
 582                 break;
 583         case IPV6_ADD_MEMBERSHIP:
 584         case IPV6_DROP_MEMBERSHIP:
 585         {
 586                 struct ipv6_mreq mreq;
 587
 588                 if (optlen < sizeof(struct ipv6_mreq))
 589                         goto e_inval;
 590
 591                 retv = -EPROTO;
 592                 if (inet_sk(sk)->is_icsk)
 593                         break;
 594
 595                 retv = -EFAULT;
 596                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 597                         break;
 598
 599                 if (optname == IPV6_ADD_MEMBERSHIP)
 600                         retv = __ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 601                 else
 602                         retv = __ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 603                 break;
 604         }
 605         case IPV6_JOIN_ANYCAST:
 606         case IPV6_LEAVE_ANYCAST:
 607         {
 608                 struct ipv6_mreq mreq;
 609
 610                 if (optlen < sizeof(struct ipv6_mreq))
 611                         goto e_inval;
 612
 613                 retv = -EFAULT;
 614                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 615                         break;
 616
 617                 if (optname == IPV6_JOIN_ANYCAST)
 618                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 619                 else
 620                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 621                 break;
 622         }
 623         case MCAST_JOIN_GROUP:
 624         case MCAST_LEAVE_GROUP:
 625         {
 626                 struct group_req greq;
 627                 struct sockaddr_in6 *psin6;
 628
 629                 if (optlen < sizeof(struct group_req))
 630                         goto e_inval;
 631
 632                 retv = -EFAULT;
 633                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 634                         break;
 635                 if (greq.gr_group.ss_family != AF_INET6) {
 636                         retv = -EADDRNOTAVAIL;
 637                         break;
 638                 }
 639                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 640                 if (optname == MCAST_JOIN_GROUP)
 641                         retv = __ipv6_sock_mc_join(sk, greq.gr_interface,
 642                                                    &psin6->sin6_addr);
 643                 else
 644                         retv = __ipv6_sock_mc_drop(sk, greq.gr_interface,
 645                                                    &psin6->sin6_addr);
 646                 break;
 647         }
 648         case MCAST_JOIN_SOURCE_GROUP:
 649         case MCAST_LEAVE_SOURCE_GROUP:
 650         case MCAST_BLOCK_SOURCE:
 651         case MCAST_UNBLOCK_SOURCE:
 652         {
 653                 struct group_source_req greqs;
 654                 int omode, add;
 655
 656                 if (optlen < sizeof(struct group_source_req))
 657                         goto e_inval;
 658                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 659                         retv = -EFAULT;
 660                         break;
 661                 }
 662                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 663                     greqs.gsr_source.ss_family != AF_INET6) {
 664                         retv = -EADDRNOTAVAIL;
 665                         break;
 666                 }
 667                 if (optname == MCAST_BLOCK_SOURCE) {
 668                         omode = MCAST_EXCLUDE;
 669                         add = 1;
 670                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 671                         omode = MCAST_EXCLUDE;
 672                         add = 0;
 673                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 674                         struct sockaddr_in6 *psin6;
 675
 676                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 677                         retv = __ipv6_sock_mc_join(sk, greqs.gsr_interface,
 678                                                    &psin6->sin6_addr);
 679                         /* prior join w/ different source is ok */
 680                         if (retv && retv != -EADDRINUSE)
 681                                 break;
 682                         omode = MCAST_INCLUDE;
 683                         add = 1;
 684                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 685                         omode = MCAST_INCLUDE;
 686                         add = 0;
 687                 }
 688                 retv = ip6_mc_source(add, omode, sk, &greqs);
 689                 break;
 690         }
 691         case MCAST_MSFILTER:
 692         {
 693                 struct group_filter *gsf;
 694
 695                 if (optlen < GROUP_FILTER_SIZE(0))
 696                         goto e_inval;
 697                 if (optlen > sysctl_optmem_max) {
 698                         retv = -ENOBUFS;
 699                         break;
 700                 }
 701                 gsf = kmalloc(optlen, GFP_KERNEL);
 702                 if (!gsf) {
 703                         retv = -ENOBUFS;
 704                         break;
 705                 }
 706                 retv = -EFAULT;
 707                 if (copy_from_user(gsf, optval, optlen)) {
 708                         kfree(gsf);
 709                         break;
 710                 }
 711                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 712                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 713                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 714                         kfree(gsf);
 715                         retv = -ENOBUFS;
 716                         break;
 717                 }
 718                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 719                         kfree(gsf);
 720                         retv = -EINVAL;
 721                         break;
 722                 }
 723                 retv = ip6_mc_msfilter(sk, gsf);
 724                 kfree(gsf);
 725
 726                 break;
 727         }
 728         case IPV6_ROUTER_ALERT:
 729                 if (optlen < sizeof(int))
 730                         goto e_inval;
 731                 retv = ip6_ra_control(sk, val);
 732                 break;
 733         case IPV6_MTU_DISCOVER:
 734                 if (optlen < sizeof(int))
 735                         goto e_inval;
 736                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 737                         goto e_inval;
 738                 np->pmtudisc = val;
 739                 retv = 0;
 740                 break;
 741         case IPV6_MTU:
 742                 if (optlen < sizeof(int))
 743                         goto e_inval;
 744                 if (val && val < IPV6_MIN_MTU)
 745                         goto e_inval;
 746                 np->frag_size = val;
 747                 retv = 0;
 748                 break;
 749         case IPV6_RECVERR:
 750                 if (optlen < sizeof(int))
 751                         goto e_inval;
 752                 np->recverr = valbool;
 753                 if (!val)
 754                         skb_queue_purge(&sk->sk_error_queue);
 755                 retv = 0;
 756                 break;
 757         case IPV6_FLOWINFO_SEND:
 758                 if (optlen < sizeof(int))
 759                         goto e_inval;
 760                 np->sndflow = valbool;
 761                 retv = 0;
 762                 break;
 763         case IPV6_FLOWLABEL_MGR:
 764                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 765                 break;
 766         case IPV6_IPSEC_POLICY:
 767         case IPV6_XFRM_POLICY:
 768                 retv = -EPERM;
 769                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 770                         break;
 771                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 772                 break;
 773
 774         case IPV6_ADDR_PREFERENCES:
 775             {
 776                 unsigned int pref = 0;
 777                 unsigned int prefmask = ~0;
 778
 779                 if (optlen < sizeof(int))
 780                         goto e_inval;
 781
 782                 retv = -EINVAL;
 783
 784                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 785                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 786                                IPV6_PREFER_SRC_TMP|
 787                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 788                 case IPV6_PREFER_SRC_PUBLIC:
 789                         pref |= IPV6_PREFER_SRC_PUBLIC;
 790                         break;
 791                 case IPV6_PREFER_SRC_TMP:
 792                         pref |= IPV6_PREFER_SRC_TMP;
 793                         break;
 794                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 795                         break;
 796                 case 0:
 797                         goto pref_skip_pubtmp;
 798                 default:
 799                         goto e_inval;
 800                 }
 801
 802                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 803                               IPV6_PREFER_SRC_TMP);
 804 pref_skip_pubtmp:
 805
 806                 /* check HOME/COA conflicts */
 807                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 808                 case IPV6_PREFER_SRC_HOME:
 809                         break;
 810                 case IPV6_PREFER_SRC_COA:
 811                         pref |= IPV6_PREFER_SRC_COA;
 812                 case 0:
 813                         goto pref_skip_coa;
 814                 default:
 815                         goto e_inval;
 816                 }
 817
 818                 prefmask &= ~IPV6_PREFER_SRC_COA;
 819 pref_skip_coa:
 820
 821                 /* check CGA/NONCGA conflicts */
 822                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 823                 case IPV6_PREFER_SRC_CGA:
 824                 case IPV6_PREFER_SRC_NONCGA:
 825                 case 0:
 826                         break;
 827                 default:
 828                         goto e_inval;
 829                 }
 830
 831                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 832                 retv = 0;
 833
 834                 break;
 835             }
 836         case IPV6_MINHOPCOUNT:
 837                 if (optlen < sizeof(int))
 838                         goto e_inval;
 839                 if (val < 0 || val > 255)
 840                         goto e_inval;
 841                 np->min_hopcount = val;
 842                 retv = 0;
 843                 break;
 844         case IPV6_DONTFRAG:
 845                 np->dontfrag = valbool;
 846                 retv = 0;
 847                 break;
 848         case IPV6_AUTOFLOWLABEL:
 849                 np->autoflowlabel = valbool;
 850                 retv = 0;
 851                 break;
 852         }
 853
 854         release_sock(sk);
 855         if (needs_rtnl)
 856                 rtnl_unlock();
 857
 858         return retv;
 859
 860 e_inval:
 861         release_sock(sk);
 862         if (needs_rtnl)
 863                 rtnl_unlock();
 864         return -EINVAL;
 865 }
 866
 867 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 868                     char __user *optval, unsigned int optlen)
 869 {
 870         int err;
 871
 872         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 873                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 874
 875         if (level != SOL_IPV6)
 876                 return -ENOPROTOOPT;
 877
 878         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 879 #ifdef CONFIG_NETFILTER
 880         /* we need to exclude all possible ENOPROTOOPTs except default case */
 881         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 882                         optname != IPV6_XFRM_POLICY) {
 883                 lock_sock(sk);
 884                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 885                                 optlen);
 886                 release_sock(sk);
 887         }
 888 #endif
 889         return err;
 890 }
 891 EXPORT_SYMBOL(ipv6_setsockopt);
 892
 893 #ifdef CONFIG_COMPAT
 894 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 895                            char __user *optval, unsigned int optlen)
 896 {
 897         int err;
 898
 899         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 900                 if (udp_prot.compat_setsockopt != NULL)
 901                         return udp_prot.compat_setsockopt(sk, level, optname,
 902                                                           optval, optlen);
 903                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 904         }
 905
 906         if (level != SOL_IPV6)
 907                 return -ENOPROTOOPT;
 908
 909         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 910                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 911                         ipv6_setsockopt);
 912
 913         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 914 #ifdef CONFIG_NETFILTER
 915         /* we need to exclude all possible ENOPROTOOPTs except default case */
 916         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 917             optname != IPV6_XFRM_POLICY) {
 918                 lock_sock(sk);
 919                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 920                                            optval, optlen);
 921                 release_sock(sk);
 922         }
 923 #endif
 924         return err;
 925 }
 926 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 927 #endif
 928
 929 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 930                                   int optname, char __user *optval, int len)
 931 {
 932         struct ipv6_opt_hdr *hdr;
 933
 934         if (!opt)
 935                 return 0;
 936
 937         switch (optname) {
 938         case IPV6_HOPOPTS:
 939                 hdr = opt->hopopt;
 940                 break;
 941         case IPV6_RTHDRDSTOPTS:
 942                 hdr = opt->dst0opt;
 943                 break;
 944         case IPV6_RTHDR:
 945                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 946                 break;
 947         case IPV6_DSTOPTS:
 948                 hdr = opt->dst1opt;
 949                 break;
 950         default:
 951                 return -EINVAL; /* should not happen */
 952         }
 953
 954         if (!hdr)
 955                 return 0;
 956
 957         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 958         if (copy_to_user(optval, hdr, len))
 959                 return -EFAULT;
 960         return len;
 961 }
 962
 963 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 964                     char __user *optval, int __user *optlen, unsigned int flags)
 965 {
 966         struct ipv6_pinfo *np = inet6_sk(sk);
 967         int len;
 968         int val;
 969
 970         if (ip6_mroute_opt(optname))
 971                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 972
 973         if (get_user(len, optlen))
 974                 return -EFAULT;
 975         switch (optname) {
 976         case IPV6_ADDRFORM:
 977                 if (sk->sk_protocol != IPPROTO_UDP &&
 978                     sk->sk_protocol != IPPROTO_UDPLITE &&
 979                     sk->sk_protocol != IPPROTO_TCP)
 980                         return -ENOPROTOOPT;
 981                 if (sk->sk_state != TCP_ESTABLISHED)
 982                         return -ENOTCONN;
 983                 val = sk->sk_family;
 984                 break;
 985         case MCAST_MSFILTER:
 986         {
 987                 struct group_filter gsf;
 988                 int err;
 989
 990                 if (len < GROUP_FILTER_SIZE(0))
 991                         return -EINVAL;
 992                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 993                         return -EFAULT;
 994                 if (gsf.gf_group.ss_family != AF_INET6)
 995                         return -EADDRNOTAVAIL;
 996                 lock_sock(sk);
 997                 err = ip6_mc_msfget(sk, &gsf,
 998                         (struct group_filter __user *)optval, optlen);
 999                 release_sock(sk);
1000                 return err;
1001         }
1002
1003         case IPV6_2292PKTOPTIONS:
1004         {
1005                 struct msghdr msg;
1006                 struct sk_buff *skb;
1007
1008                 if (sk->sk_type != SOCK_STREAM)
1009                         return -ENOPROTOOPT;
1010
1011                 msg.msg_control = optval;
1012                 msg.msg_controllen = len;
1013                 msg.msg_flags = flags;
1014
1015                 lock_sock(sk);
1016                 skb = np->pktoptions;
1017                 if (skb)
1018                         ip6_datagram_recv_ctl(sk, &msg, skb);
1019                 release_sock(sk);
1020                 if (!skb) {
1021                         if (np->rxopt.bits.rxinfo) {
1022                                 struct in6_pktinfo src_info;
1023                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1024                                         np->sticky_pktinfo.ipi6_ifindex;
1025                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1026                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1027                         }
1028                         if (np->rxopt.bits.rxhlim) {
1029                                 int hlim = np->mcast_hops;
1030                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1031                         }
1032                         if (np->rxopt.bits.rxtclass) {
1033                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1034
1035                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1036                         }
1037                         if (np->rxopt.bits.rxoinfo) {
1038                                 struct in6_pktinfo src_info;
1039                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1040                                         np->sticky_pktinfo.ipi6_ifindex;
1041                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1042                                                                      np->sticky_pktinfo.ipi6_addr;
1043                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1044                         }
1045                         if (np->rxopt.bits.rxohlim) {
1046                                 int hlim = np->mcast_hops;
1047                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1048                         }
1049                         if (np->rxopt.bits.rxflow) {
1050                                 __be32 flowinfo = np->rcv_flowinfo;
1051
1052                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1053                         }
1054                 }
1055                 len -= msg.msg_controllen;
1056                 return put_user(len, optlen);
1057         }
1058         case IPV6_MTU:
1059         {
1060                 struct dst_entry *dst;
1061
1062                 val = 0;
1063                 rcu_read_lock();
1064                 dst = __sk_dst_get(sk);
1065                 if (dst)
1066                         val = dst_mtu(dst);
1067                 rcu_read_unlock();
1068                 if (!val)
1069                         return -ENOTCONN;
1070                 break;
1071         }
1072
1073         case IPV6_V6ONLY:
1074                 val = sk->sk_ipv6only;
1075                 break;
1076
1077         case IPV6_RECVPKTINFO:
1078                 val = np->rxopt.bits.rxinfo;
1079                 break;
1080
1081         case IPV6_2292PKTINFO:
1082                 val = np->rxopt.bits.rxoinfo;
1083                 break;
1084
1085         case IPV6_RECVHOPLIMIT:
1086                 val = np->rxopt.bits.rxhlim;
1087                 break;
1088
1089         case IPV6_2292HOPLIMIT:
1090                 val = np->rxopt.bits.rxohlim;
1091                 break;
1092
1093         case IPV6_RECVRTHDR:
1094                 val = np->rxopt.bits.srcrt;
1095                 break;
1096
1097         case IPV6_2292RTHDR:
1098                 val = np->rxopt.bits.osrcrt;
1099                 break;
1100
1101         case IPV6_HOPOPTS:
1102         case IPV6_RTHDRDSTOPTS:
1103         case IPV6_RTHDR:
1104         case IPV6_DSTOPTS:
1105         {
1106
1107                 lock_sock(sk);
1108                 len = ipv6_getsockopt_sticky(sk, np->opt,
1109                                              optname, optval, len);
1110                 release_sock(sk);
1111                 /* check if ipv6_getsockopt_sticky() returns err code */
1112                 if (len < 0)
1113                         return len;
1114                 return put_user(len, optlen);
1115         }
1116
1117         case IPV6_RECVHOPOPTS:
1118                 val = np->rxopt.bits.hopopts;
1119                 break;
1120
1121         case IPV6_2292HOPOPTS:
1122                 val = np->rxopt.bits.ohopopts;
1123                 break;
1124
1125         case IPV6_RECVDSTOPTS:
1126                 val = np->rxopt.bits.dstopts;
1127                 break;
1128
1129         case IPV6_2292DSTOPTS:
1130                 val = np->rxopt.bits.odstopts;
1131                 break;
1132
1133         case IPV6_TCLASS:
1134                 val = np->tclass;
1135                 break;
1136
1137         case IPV6_RECVTCLASS:
1138                 val = np->rxopt.bits.rxtclass;
1139                 break;
1140
1141         case IPV6_FLOWINFO:
1142                 val = np->rxopt.bits.rxflow;
1143                 break;
1144
1145         case IPV6_RECVPATHMTU:
1146                 val = np->rxopt.bits.rxpmtu;
1147                 break;
1148
1149         case IPV6_PATHMTU:
1150         {
1151                 struct dst_entry *dst;
1152                 struct ip6_mtuinfo mtuinfo;
1153
1154                 if (len < sizeof(mtuinfo))
1155                         return -EINVAL;
1156
1157                 len = sizeof(mtuinfo);
1158                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1159
1160                 rcu_read_lock();
1161                 dst = __sk_dst_get(sk);
1162                 if (dst)
1163                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1164                 rcu_read_unlock();
1165                 if (!mtuinfo.ip6m_mtu)
1166                         return -ENOTCONN;
1167
1168                 if (put_user(len, optlen))
1169                         return -EFAULT;
1170                 if (copy_to_user(optval, &mtuinfo, len))
1171                         return -EFAULT;
1172
1173                 return 0;
1174         }
1175
1176         case IPV6_TRANSPARENT:
1177                 val = inet_sk(sk)->transparent;
1178                 break;
1179
1180         case IPV6_RECVORIGDSTADDR:
1181                 val = np->rxopt.bits.rxorigdstaddr;
1182                 break;
1183
1184         case IPV6_UNICAST_HOPS:
1185         case IPV6_MULTICAST_HOPS:
1186         {
1187                 struct dst_entry *dst;
1188
1189                 if (optname == IPV6_UNICAST_HOPS)
1190                         val = np->hop_limit;
1191                 else
1192                         val = np->mcast_hops;
1193
1194                 if (val < 0) {
1195                         rcu_read_lock();
1196                         dst = __sk_dst_get(sk);
1197                         if (dst)
1198                                 val = ip6_dst_hoplimit(dst);
1199                         rcu_read_unlock();
1200                 }
1201
1202                 if (val < 0)
1203                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1204                 break;
1205         }
1206
1207         case IPV6_MULTICAST_LOOP:
1208                 val = np->mc_loop;
1209                 break;
1210
1211         case IPV6_MULTICAST_IF:
1212                 val = np->mcast_oif;
1213                 break;
1214
1215         case IPV6_UNICAST_IF:
1216                 val = (__force int)htonl((__u32) np->ucast_oif);
1217                 break;
1218
1219         case IPV6_MTU_DISCOVER:
1220                 val = np->pmtudisc;
1221                 break;
1222
1223         case IPV6_RECVERR:
1224                 val = np->recverr;
1225                 break;
1226
1227         case IPV6_FLOWINFO_SEND:
1228                 val = np->sndflow;
1229                 break;
1230
1231         case IPV6_FLOWLABEL_MGR:
1232         {
1233                 struct in6_flowlabel_req freq;
1234                 int flags;
1235
1236                 if (len < sizeof(freq))
1237                         return -EINVAL;
1238
1239                 if (copy_from_user(&freq, optval, sizeof(freq)))
1240                         return -EFAULT;
1241
1242                 if (freq.flr_action != IPV6_FL_A_GET)
1243                         return -EINVAL;
1244
1245                 len = sizeof(freq);
1246                 flags = freq.flr_flags;
1247
1248                 memset(&freq, 0, sizeof(freq));
1249
1250                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1251                 if (val < 0)
1252                         return val;
1253
1254                 if (put_user(len, optlen))
1255                         return -EFAULT;
1256                 if (copy_to_user(optval, &freq, len))
1257                         return -EFAULT;
1258
1259                 return 0;
1260         }
1261
1262         case IPV6_ADDR_PREFERENCES:
1263                 val = 0;
1264
1265                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1266                         val |= IPV6_PREFER_SRC_TMP;
1267                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1268                         val |= IPV6_PREFER_SRC_PUBLIC;
1269                 else {
1270                         /* XXX: should we return system default? */
1271                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1272                 }
1273
1274                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1275                         val |= IPV6_PREFER_SRC_COA;
1276                 else
1277                         val |= IPV6_PREFER_SRC_HOME;
1278                 break;
1279
1280         case IPV6_MINHOPCOUNT:
1281                 val = np->min_hopcount;
1282                 break;
1283
1284         case IPV6_DONTFRAG:
1285                 val = np->dontfrag;
1286                 break;
1287
1288         case IPV6_AUTOFLOWLABEL:
1289                 val = np->autoflowlabel;
1290                 break;
1291
1292         default:
1293                 return -ENOPROTOOPT;
1294         }
1295         len = min_t(unsigned int, sizeof(int), len);
1296         if (put_user(len, optlen))
1297                 return -EFAULT;
1298         if (copy_to_user(optval, &val, len))
1299                 return -EFAULT;
1300         return 0;
1301 }
1302
1303 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1304                     char __user *optval, int __user *optlen)
1305 {
1306         int err;
1307
1308         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1309                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1310
1311         if (level != SOL_IPV6)
1312                 return -ENOPROTOOPT;
1313
1314         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1315 #ifdef CONFIG_NETFILTER
1316         /* we need to exclude all possible ENOPROTOOPTs except default case */
1317         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1318                 int len;
1319
1320                 if (get_user(len, optlen))
1321                         return -EFAULT;
1322
1323                 lock_sock(sk);
1324                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1325                                 &len);
1326                 release_sock(sk);
1327                 if (err >= 0)
1328                         err = put_user(len, optlen);
1329         }
1330 #endif
1331         return err;
1332 }
1333 EXPORT_SYMBOL(ipv6_getsockopt);
1334
1335 #ifdef CONFIG_COMPAT
1336 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1337                            char __user *optval, int __user *optlen)
1338 {
1339         int err;
1340
1341         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1342                 if (udp_prot.compat_getsockopt != NULL)
1343                         return udp_prot.compat_getsockopt(sk, level, optname,
1344                                                           optval, optlen);
1345                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1346         }
1347
1348         if (level != SOL_IPV6)
1349                 return -ENOPROTOOPT;
1350
1351         if (optname == MCAST_MSFILTER)
1352                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1353                         ipv6_getsockopt);
1354
1355         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1356                                  MSG_CMSG_COMPAT);
1357 #ifdef CONFIG_NETFILTER
1358         /* we need to exclude all possible ENOPROTOOPTs except default case */
1359         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1360                 int len;
1361
1362                 if (get_user(len, optlen))
1363                         return -EFAULT;
1364
1365                 lock_sock(sk);
1366                 err = compat_nf_getsockopt(sk, PF_INET6,
1367                                            optname, optval, &len);
1368                 release_sock(sk);
1369                 if (err >= 0)
1370                         err = put_user(len, optlen);
1371         }
1372 #endif
1373         return err;
1374 }
1375 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1376 #endif
1377