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) {
  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 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 102                                            struct ipv6_txoptions *opt)
 103 {
 104         if (inet_sk(sk)->is_icsk) {
 105                 if (opt &&
 106                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 107                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 108                         struct inet_connection_sock *icsk = inet_csk(sk);
 109                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 110                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 111                 }
 112         }
 113         opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
 114                    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_ADDRFORM:
 124         case IPV6_ADD_MEMBERSHIP:
 125         case IPV6_DROP_MEMBERSHIP:
 126         case IPV6_JOIN_ANYCAST:
 127         case IPV6_LEAVE_ANYCAST:
 128         case MCAST_JOIN_GROUP:
 129         case MCAST_LEAVE_GROUP:
 130         case MCAST_JOIN_SOURCE_GROUP:
 131         case MCAST_LEAVE_SOURCE_GROUP:
 132         case MCAST_BLOCK_SOURCE:
 133         case MCAST_UNBLOCK_SOURCE:
 134         case MCAST_MSFILTER:
 135                 return true;
 136         }
 137         return false;
 138 }
 139
 140 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 141                     char __user *optval, unsigned int optlen)
 142 {
 143         struct ipv6_pinfo *np = inet6_sk(sk);
 144         struct net *net = sock_net(sk);
 145         int val, valbool;
 146         int retv = -ENOPROTOOPT;
 147         bool needs_rtnl = setsockopt_needs_rtnl(optname);
 148
 149         if (!optval)
 150                 val = 0;
 151         else {
 152                 if (optlen >= sizeof(int)) {
 153                         if (get_user(val, (int __user *) optval))
 154                                 return -EFAULT;
 155                 } else
 156                         val = 0;
 157         }
 158
 159         valbool = (val != 0);
 160
 161         if (ip6_mroute_opt(optname))
 162                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 163
 164         if (needs_rtnl)
 165                 rtnl_lock();
 166         lock_sock(sk);
 167
 168         switch (optname) {
 169
 170         case IPV6_ADDRFORM:
 171                 if (optlen < sizeof(int))
 172                         goto e_inval;
 173                 if (val == PF_INET) {
 174                         struct ipv6_txoptions *opt;
 175                         struct sk_buff *pktopt;
 176
 177                         if (sk->sk_type == SOCK_RAW)
 178                                 break;
 179
 180                         if (sk->sk_protocol == IPPROTO_UDP ||
 181                             sk->sk_protocol == IPPROTO_UDPLITE) {
 182                                 struct udp_sock *up = udp_sk(sk);
 183                                 if (up->pending == AF_INET6) {
 184                                         retv = -EBUSY;
 185                                         break;
 186                                 }
 187                         } else if (sk->sk_protocol != IPPROTO_TCP)
 188                                 break;
 189
 190                         if (sk->sk_state != TCP_ESTABLISHED) {
 191                                 retv = -ENOTCONN;
 192                                 break;
 193                         }
 194
 195                         if (ipv6_only_sock(sk) ||
 196                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 197                                 retv = -EADDRNOTAVAIL;
 198                                 break;
 199                         }
 200
 201                         fl6_free_socklist(sk);
 202                         __ipv6_sock_mc_close(sk);
 203
 204                         /*
 205                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 206                          * remove it from the refcnt debug socks count in the
 207                          * original family...
 208                          */
 209                         sk_refcnt_debug_dec(sk);
 210
 211                         if (sk->sk_protocol == IPPROTO_TCP) {
 212                                 struct inet_connection_sock *icsk = inet_csk(sk);
 213                                 local_bh_disable();
 214                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 215                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 216                                 local_bh_enable();
 217                                 sk->sk_prot = &tcp_prot;
 218                                 icsk->icsk_af_ops = &ipv4_specific;
 219                                 sk->sk_socket->ops = &inet_stream_ops;
 220                                 sk->sk_family = PF_INET;
 221                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 222                         } else {
 223                                 struct proto *prot = &udp_prot;
 224
 225                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 226                                         prot = &udplite_prot;
 227                                 local_bh_disable();
 228                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 229                                 sock_prot_inuse_add(net, prot, 1);
 230                                 local_bh_enable();
 231                                 sk->sk_prot = prot;
 232                                 sk->sk_socket->ops = &inet_dgram_ops;
 233                                 sk->sk_family = PF_INET;
 234                         }
 235                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
 236                                    NULL);
 237                         if (opt) {
 238                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 239                                 txopt_put(opt);
 240                         }
 241                         pktopt = xchg(&np->pktoptions, NULL);
 242                         kfree_skb(pktopt);
 243
 244                         sk->sk_destruct = inet_sock_destruct;
 245                         /*
 246                          * ... and add it to the refcnt debug socks count
 247                          * in the new family. -acme
 248                          */
 249                         sk_refcnt_debug_inc(sk);
 250                         module_put(THIS_MODULE);
 251                         retv = 0;
 252                         break;
 253                 }
 254                 goto e_inval;
 255
 256         case IPV6_V6ONLY:
 257                 if (optlen < sizeof(int) ||
 258                     inet_sk(sk)->inet_num)
 259                         goto e_inval;
 260                 sk->sk_ipv6only = valbool;
 261                 retv = 0;
 262                 break;
 263
 264         case IPV6_RECVPKTINFO:
 265                 if (optlen < sizeof(int))
 266                         goto e_inval;
 267                 np->rxopt.bits.rxinfo = valbool;
 268                 retv = 0;
 269                 break;
 270
 271         case IPV6_2292PKTINFO:
 272                 if (optlen < sizeof(int))
 273                         goto e_inval;
 274                 np->rxopt.bits.rxoinfo = valbool;
 275                 retv = 0;
 276                 break;
 277
 278         case IPV6_RECVHOPLIMIT:
 279                 if (optlen < sizeof(int))
 280                         goto e_inval;
 281                 np->rxopt.bits.rxhlim = valbool;
 282                 retv = 0;
 283                 break;
 284
 285         case IPV6_2292HOPLIMIT:
 286                 if (optlen < sizeof(int))
 287                         goto e_inval;
 288                 np->rxopt.bits.rxohlim = valbool;
 289                 retv = 0;
 290                 break;
 291
 292         case IPV6_RECVRTHDR:
 293                 if (optlen < sizeof(int))
 294                         goto e_inval;
 295                 np->rxopt.bits.srcrt = valbool;
 296                 retv = 0;
 297                 break;
 298
 299         case IPV6_2292RTHDR:
 300                 if (optlen < sizeof(int))
 301                         goto e_inval;
 302                 np->rxopt.bits.osrcrt = valbool;
 303                 retv = 0;
 304                 break;
 305
 306         case IPV6_RECVHOPOPTS:
 307                 if (optlen < sizeof(int))
 308                         goto e_inval;
 309                 np->rxopt.bits.hopopts = valbool;
 310                 retv = 0;
 311                 break;
 312
 313         case IPV6_2292HOPOPTS:
 314                 if (optlen < sizeof(int))
 315                         goto e_inval;
 316                 np->rxopt.bits.ohopopts = valbool;
 317                 retv = 0;
 318                 break;
 319
 320         case IPV6_RECVDSTOPTS:
 321                 if (optlen < sizeof(int))
 322                         goto e_inval;
 323                 np->rxopt.bits.dstopts = valbool;
 324                 retv = 0;
 325                 break;
 326
 327         case IPV6_2292DSTOPTS:
 328                 if (optlen < sizeof(int))
 329                         goto e_inval;
 330                 np->rxopt.bits.odstopts = valbool;
 331                 retv = 0;
 332                 break;
 333
 334         case IPV6_TCLASS:
 335                 if (optlen < sizeof(int))
 336                         goto e_inval;
 337                 if (val < -1 || val > 0xff)
 338                         goto e_inval;
 339                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 340                 if (val == -1)
 341                         val = 0;
 342                 np->tclass = val;
 343                 retv = 0;
 344                 break;
 345
 346         case IPV6_RECVTCLASS:
 347                 if (optlen < sizeof(int))
 348                         goto e_inval;
 349                 np->rxopt.bits.rxtclass = valbool;
 350                 retv = 0;
 351                 break;
 352
 353         case IPV6_FLOWINFO:
 354                 if (optlen < sizeof(int))
 355                         goto e_inval;
 356                 np->rxopt.bits.rxflow = valbool;
 357                 retv = 0;
 358                 break;
 359
 360         case IPV6_RECVPATHMTU:
 361                 if (optlen < sizeof(int))
 362                         goto e_inval;
 363                 np->rxopt.bits.rxpmtu = valbool;
 364                 retv = 0;
 365                 break;
 366
 367         case IPV6_TRANSPARENT:
 368                 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 369                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 370                         retv = -EPERM;
 371                         break;
 372                 }
 373                 if (optlen < sizeof(int))
 374                         goto e_inval;
 375                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 376                 inet_sk(sk)->transparent = valbool;
 377                 retv = 0;
 378                 break;
 379
 380         case IPV6_RECVORIGDSTADDR:
 381                 if (optlen < sizeof(int))
 382                         goto e_inval;
 383                 np->rxopt.bits.rxorigdstaddr = valbool;
 384                 retv = 0;
 385                 break;
 386
 387         case IPV6_HOPOPTS:
 388         case IPV6_RTHDRDSTOPTS:
 389         case IPV6_RTHDR:
 390         case IPV6_DSTOPTS:
 391         {
 392                 struct ipv6_txoptions *opt;
 393
 394                 /* remove any sticky options header with a zero option
 395                  * length, per RFC3542.
 396                  */
 397                 if (optlen == 0)
 398                         optval = NULL;
 399                 else if (!optval)
 400                         goto e_inval;
 401                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 402                          optlen & 0x7 || optlen > 8 * 255)
 403                         goto e_inval;
 404
 405                 /* hop-by-hop / destination options are privileged option */
 406                 retv = -EPERM;
 407                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 408                         break;
 409
 410                 opt = rcu_dereference_protected(np->opt,
 411                                                 lockdep_sock_is_held(sk));
 412                 opt = ipv6_renew_options(sk, opt, optname,
 413                                          (struct ipv6_opt_hdr __user *)optval,
 414                                          optlen);
 415                 if (IS_ERR(opt)) {
 416                         retv = PTR_ERR(opt);
 417                         break;
 418                 }
 419
 420                 /* routing header option needs extra check */
 421                 retv = -EINVAL;
 422                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 423                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 424                         switch (rthdr->type) {
 425 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 426                         case IPV6_SRCRT_TYPE_2:
 427                                 if (rthdr->hdrlen != 2 ||
 428                                     rthdr->segments_left != 1)
 429                                         goto sticky_done;
 430
 431                                 break;
 432 #endif
 433                         default:
 434                                 goto sticky_done;
 435                         }
 436                 }
 437
 438                 retv = 0;
 439                 opt = ipv6_update_options(sk, opt);
 440 sticky_done:
 441                 if (opt) {
 442                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 443                         txopt_put(opt);
 444                 }
 445                 break;
 446         }
 447
 448         case IPV6_PKTINFO:
 449         {
 450                 struct in6_pktinfo pkt;
 451
 452                 if (optlen == 0)
 453                         goto e_inval;
 454                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 455                         goto e_inval;
 456
 457                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 458                                 retv = -EFAULT;
 459                                 break;
 460                 }
 461                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 462                         goto e_inval;
 463
 464                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 465                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 466                 retv = 0;
 467                 break;
 468         }
 469
 470         case IPV6_2292PKTOPTIONS:
 471         {
 472                 struct ipv6_txoptions *opt = NULL;
 473                 struct msghdr msg;
 474                 struct flowi6 fl6;
 475                 struct sockcm_cookie sockc_junk;
 476                 struct ipcm6_cookie ipc6;
 477
 478                 memset(&fl6, 0, sizeof(fl6));
 479                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 480                 fl6.flowi6_mark = sk->sk_mark;
 481
 482                 if (optlen == 0)
 483                         goto update;
 484
 485                 /* 1K is probably excessive
 486                  * 1K is surely not enough, 2K per standard header is 16K.
 487                  */
 488                 retv = -EINVAL;
 489                 if (optlen > 64*1024)
 490                         break;
 491
 492                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 493                 retv = -ENOBUFS;
 494                 if (!opt)
 495                         break;
 496
 497                 memset(opt, 0, sizeof(*opt));
 498                 atomic_set(&opt->refcnt, 1);
 499                 opt->tot_len = sizeof(*opt) + optlen;
 500                 retv = -EFAULT;
 501                 if (copy_from_user(opt+1, optval, optlen))
 502                         goto done;
 503
 504                 msg.msg_controllen = optlen;
 505                 msg.msg_control = (void *)(opt+1);
 506                 ipc6.opt = opt;
 507
 508                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
 509                 if (retv)
 510                         goto done;
 511 update:
 512                 retv = 0;
 513                 opt = ipv6_update_options(sk, opt);
 514 done:
 515                 if (opt) {
 516                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 517                         txopt_put(opt);
 518                 }
 519                 break;
 520         }
 521         case IPV6_UNICAST_HOPS:
 522                 if (optlen < sizeof(int))
 523                         goto e_inval;
 524                 if (val > 255 || val < -1)
 525                         goto e_inval;
 526                 np->hop_limit = val;
 527                 retv = 0;
 528                 break;
 529
 530         case IPV6_MULTICAST_HOPS:
 531                 if (sk->sk_type == SOCK_STREAM)
 532                         break;
 533                 if (optlen < sizeof(int))
 534                         goto e_inval;
 535                 if (val > 255 || val < -1)
 536                         goto e_inval;
 537                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 538                 retv = 0;
 539                 break;
 540
 541         case IPV6_MULTICAST_LOOP:
 542                 if (optlen < sizeof(int))
 543                         goto e_inval;
 544                 if (val != valbool)
 545                         goto e_inval;
 546                 np->mc_loop = valbool;
 547                 retv = 0;
 548                 break;
 549
 550         case IPV6_UNICAST_IF:
 551         {
 552                 struct net_device *dev = NULL;
 553                 int ifindex;
 554
 555                 if (optlen != sizeof(int))
 556                         goto e_inval;
 557
 558                 ifindex = (__force int)ntohl((__force __be32)val);
 559                 if (ifindex == 0) {
 560                         np->ucast_oif = 0;
 561                         retv = 0;
 562                         break;
 563                 }
 564
 565                 dev = dev_get_by_index(net, ifindex);
 566                 retv = -EADDRNOTAVAIL;
 567                 if (!dev)
 568                         break;
 569                 dev_put(dev);
 570
 571                 retv = -EINVAL;
 572                 if (sk->sk_bound_dev_if)
 573                         break;
 574
 575                 np->ucast_oif = ifindex;
 576                 retv = 0;
 577                 break;
 578         }
 579
 580         case IPV6_MULTICAST_IF:
 581                 if (sk->sk_type == SOCK_STREAM)
 582                         break;
 583                 if (optlen < sizeof(int))
 584                         goto e_inval;
 585
 586                 if (val) {
 587                         struct net_device *dev;
 588
 589                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 590                                 goto e_inval;
 591
 592                         dev = dev_get_by_index(net, val);
 593                         if (!dev) {
 594                                 retv = -ENODEV;
 595                                 break;
 596                         }
 597                         dev_put(dev);
 598                 }
 599                 np->mcast_oif = val;
 600                 retv = 0;
 601                 break;
 602         case IPV6_ADD_MEMBERSHIP:
 603         case IPV6_DROP_MEMBERSHIP:
 604         {
 605                 struct ipv6_mreq mreq;
 606
 607                 if (optlen < sizeof(struct ipv6_mreq))
 608                         goto e_inval;
 609
 610                 retv = -EPROTO;
 611                 if (inet_sk(sk)->is_icsk)
 612                         break;
 613
 614                 retv = -EFAULT;
 615                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 616                         break;
 617
 618                 if (optname == IPV6_ADD_MEMBERSHIP)
 619                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 620                 else
 621                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 622                 break;
 623         }
 624         case IPV6_JOIN_ANYCAST:
 625         case IPV6_LEAVE_ANYCAST:
 626         {
 627                 struct ipv6_mreq mreq;
 628
 629                 if (optlen < sizeof(struct ipv6_mreq))
 630                         goto e_inval;
 631
 632                 retv = -EFAULT;
 633                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 634                         break;
 635
 636                 if (optname == IPV6_JOIN_ANYCAST)
 637                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 638                 else
 639                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 640                 break;
 641         }
 642         case MCAST_JOIN_GROUP:
 643         case MCAST_LEAVE_GROUP:
 644         {
 645                 struct group_req greq;
 646                 struct sockaddr_in6 *psin6;
 647
 648                 if (optlen < sizeof(struct group_req))
 649                         goto e_inval;
 650
 651                 retv = -EFAULT;
 652                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 653                         break;
 654                 if (greq.gr_group.ss_family != AF_INET6) {
 655                         retv = -EADDRNOTAVAIL;
 656                         break;
 657                 }
 658                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 659                 if (optname == MCAST_JOIN_GROUP)
 660                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 661                                                  &psin6->sin6_addr);
 662                 else
 663                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 664                                                  &psin6->sin6_addr);
 665                 break;
 666         }
 667         case MCAST_JOIN_SOURCE_GROUP:
 668         case MCAST_LEAVE_SOURCE_GROUP:
 669         case MCAST_BLOCK_SOURCE:
 670         case MCAST_UNBLOCK_SOURCE:
 671         {
 672                 struct group_source_req greqs;
 673                 int omode, add;
 674
 675                 if (optlen < sizeof(struct group_source_req))
 676                         goto e_inval;
 677                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 678                         retv = -EFAULT;
 679                         break;
 680                 }
 681                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 682                     greqs.gsr_source.ss_family != AF_INET6) {
 683                         retv = -EADDRNOTAVAIL;
 684                         break;
 685                 }
 686                 if (optname == MCAST_BLOCK_SOURCE) {
 687                         omode = MCAST_EXCLUDE;
 688                         add = 1;
 689                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 690                         omode = MCAST_EXCLUDE;
 691                         add = 0;
 692                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 693                         struct sockaddr_in6 *psin6;
 694
 695                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 696                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 697                                                  &psin6->sin6_addr);
 698                         /* prior join w/ different source is ok */
 699                         if (retv && retv != -EADDRINUSE)
 700                                 break;
 701                         omode = MCAST_INCLUDE;
 702                         add = 1;
 703                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 704                         omode = MCAST_INCLUDE;
 705                         add = 0;
 706                 }
 707                 retv = ip6_mc_source(add, omode, sk, &greqs);
 708                 break;
 709         }
 710         case MCAST_MSFILTER:
 711         {
 712                 struct group_filter *gsf;
 713
 714                 if (optlen < GROUP_FILTER_SIZE(0))
 715                         goto e_inval;
 716                 if (optlen > sysctl_optmem_max) {
 717                         retv = -ENOBUFS;
 718                         break;
 719                 }
 720                 gsf = kmalloc(optlen, GFP_KERNEL);
 721                 if (!gsf) {
 722                         retv = -ENOBUFS;
 723                         break;
 724                 }
 725                 retv = -EFAULT;
 726                 if (copy_from_user(gsf, optval, optlen)) {
 727                         kfree(gsf);
 728                         break;
 729                 }
 730                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 731                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 732                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 733                         kfree(gsf);
 734                         retv = -ENOBUFS;
 735                         break;
 736                 }
 737                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 738                         kfree(gsf);
 739                         retv = -EINVAL;
 740                         break;
 741                 }
 742                 retv = ip6_mc_msfilter(sk, gsf);
 743                 kfree(gsf);
 744
 745                 break;
 746         }
 747         case IPV6_ROUTER_ALERT:
 748                 if (optlen < sizeof(int))
 749                         goto e_inval;
 750                 retv = ip6_ra_control(sk, val);
 751                 break;
 752         case IPV6_MTU_DISCOVER:
 753                 if (optlen < sizeof(int))
 754                         goto e_inval;
 755                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 756                         goto e_inval;
 757                 np->pmtudisc = val;
 758                 retv = 0;
 759                 break;
 760         case IPV6_MTU:
 761                 if (optlen < sizeof(int))
 762                         goto e_inval;
 763                 if (val && val < IPV6_MIN_MTU)
 764                         goto e_inval;
 765                 np->frag_size = val;
 766                 retv = 0;
 767                 break;
 768         case IPV6_RECVERR:
 769                 if (optlen < sizeof(int))
 770                         goto e_inval;
 771                 np->recverr = valbool;
 772                 if (!val)
 773                         skb_queue_purge(&sk->sk_error_queue);
 774                 retv = 0;
 775                 break;
 776         case IPV6_FLOWINFO_SEND:
 777                 if (optlen < sizeof(int))
 778                         goto e_inval;
 779                 np->sndflow = valbool;
 780                 retv = 0;
 781                 break;
 782         case IPV6_FLOWLABEL_MGR:
 783                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 784                 break;
 785         case IPV6_IPSEC_POLICY:
 786         case IPV6_XFRM_POLICY:
 787                 retv = -EPERM;
 788                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 789                         break;
 790                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 791                 break;
 792
 793         case IPV6_ADDR_PREFERENCES:
 794             {
 795                 unsigned int pref = 0;
 796                 unsigned int prefmask = ~0;
 797
 798                 if (optlen < sizeof(int))
 799                         goto e_inval;
 800
 801                 retv = -EINVAL;
 802
 803                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 804                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 805                                IPV6_PREFER_SRC_TMP|
 806                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 807                 case IPV6_PREFER_SRC_PUBLIC:
 808                         pref |= IPV6_PREFER_SRC_PUBLIC;
 809                         break;
 810                 case IPV6_PREFER_SRC_TMP:
 811                         pref |= IPV6_PREFER_SRC_TMP;
 812                         break;
 813                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 814                         break;
 815                 case 0:
 816                         goto pref_skip_pubtmp;
 817                 default:
 818                         goto e_inval;
 819                 }
 820
 821                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 822                               IPV6_PREFER_SRC_TMP);
 823 pref_skip_pubtmp:
 824
 825                 /* check HOME/COA conflicts */
 826                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 827                 case IPV6_PREFER_SRC_HOME:
 828                         break;
 829                 case IPV6_PREFER_SRC_COA:
 830                         pref |= IPV6_PREFER_SRC_COA;
 831                 case 0:
 832                         goto pref_skip_coa;
 833                 default:
 834                         goto e_inval;
 835                 }
 836
 837                 prefmask &= ~IPV6_PREFER_SRC_COA;
 838 pref_skip_coa:
 839
 840                 /* check CGA/NONCGA conflicts */
 841                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 842                 case IPV6_PREFER_SRC_CGA:
 843                 case IPV6_PREFER_SRC_NONCGA:
 844                 case 0:
 845                         break;
 846                 default:
 847                         goto e_inval;
 848                 }
 849
 850                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 851                 retv = 0;
 852
 853                 break;
 854             }
 855         case IPV6_MINHOPCOUNT:
 856                 if (optlen < sizeof(int))
 857                         goto e_inval;
 858                 if (val < 0 || val > 255)
 859                         goto e_inval;
 860                 np->min_hopcount = val;
 861                 retv = 0;
 862                 break;
 863         case IPV6_DONTFRAG:
 864                 np->dontfrag = valbool;
 865                 retv = 0;
 866                 break;
 867         case IPV6_AUTOFLOWLABEL:
 868                 np->autoflowlabel = valbool;
 869                 retv = 0;
 870                 break;
 871         }
 872
 873         release_sock(sk);
 874         if (needs_rtnl)
 875                 rtnl_unlock();
 876
 877         return retv;
 878
 879 e_inval:
 880         release_sock(sk);
 881         if (needs_rtnl)
 882                 rtnl_unlock();
 883         return -EINVAL;
 884 }
 885
 886 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 887                     char __user *optval, unsigned int optlen)
 888 {
 889         int err;
 890
 891         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 892                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 893
 894         if (level != SOL_IPV6)
 895                 return -ENOPROTOOPT;
 896
 897         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 898 #ifdef CONFIG_NETFILTER
 899         /* we need to exclude all possible ENOPROTOOPTs except default case */
 900         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 901                         optname != IPV6_XFRM_POLICY) {
 902                 lock_sock(sk);
 903                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 904                                 optlen);
 905                 release_sock(sk);
 906         }
 907 #endif
 908         return err;
 909 }
 910 EXPORT_SYMBOL(ipv6_setsockopt);
 911
 912 #ifdef CONFIG_COMPAT
 913 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 914                            char __user *optval, unsigned int optlen)
 915 {
 916         int err;
 917
 918         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 919                 if (udp_prot.compat_setsockopt != NULL)
 920                         return udp_prot.compat_setsockopt(sk, level, optname,
 921                                                           optval, optlen);
 922                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 923         }
 924
 925         if (level != SOL_IPV6)
 926                 return -ENOPROTOOPT;
 927
 928         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 929                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 930                         ipv6_setsockopt);
 931
 932         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 933 #ifdef CONFIG_NETFILTER
 934         /* we need to exclude all possible ENOPROTOOPTs except default case */
 935         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 936             optname != IPV6_XFRM_POLICY) {
 937                 lock_sock(sk);
 938                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 939                                            optval, optlen);
 940                 release_sock(sk);
 941         }
 942 #endif
 943         return err;
 944 }
 945 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 946 #endif
 947
 948 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 949                                   int optname, char __user *optval, int len)
 950 {
 951         struct ipv6_opt_hdr *hdr;
 952
 953         if (!opt)
 954                 return 0;
 955
 956         switch (optname) {
 957         case IPV6_HOPOPTS:
 958                 hdr = opt->hopopt;
 959                 break;
 960         case IPV6_RTHDRDSTOPTS:
 961                 hdr = opt->dst0opt;
 962                 break;
 963         case IPV6_RTHDR:
 964                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 965                 break;
 966         case IPV6_DSTOPTS:
 967                 hdr = opt->dst1opt;
 968                 break;
 969         default:
 970                 return -EINVAL; /* should not happen */
 971         }
 972
 973         if (!hdr)
 974                 return 0;
 975
 976         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 977         if (copy_to_user(optval, hdr, len))
 978                 return -EFAULT;
 979         return len;
 980 }
 981
 982 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 983                     char __user *optval, int __user *optlen, unsigned int flags)
 984 {
 985         struct ipv6_pinfo *np = inet6_sk(sk);
 986         int len;
 987         int val;
 988
 989         if (ip6_mroute_opt(optname))
 990                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 991
 992         if (get_user(len, optlen))
 993                 return -EFAULT;
 994         switch (optname) {
 995         case IPV6_ADDRFORM:
 996                 if (sk->sk_protocol != IPPROTO_UDP &&
 997                     sk->sk_protocol != IPPROTO_UDPLITE &&
 998                     sk->sk_protocol != IPPROTO_TCP)
 999                         return -ENOPROTOOPT;
1000                 if (sk->sk_state != TCP_ESTABLISHED)
1001                         return -ENOTCONN;
1002                 val = sk->sk_family;
1003                 break;
1004         case MCAST_MSFILTER:
1005         {
1006                 struct group_filter gsf;
1007                 int err;
1008
1009                 if (len < GROUP_FILTER_SIZE(0))
1010                         return -EINVAL;
1011                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1012                         return -EFAULT;
1013                 if (gsf.gf_group.ss_family != AF_INET6)
1014                         return -EADDRNOTAVAIL;
1015                 lock_sock(sk);
1016                 err = ip6_mc_msfget(sk, &gsf,
1017                         (struct group_filter __user *)optval, optlen);
1018                 release_sock(sk);
1019                 return err;
1020         }
1021
1022         case IPV6_2292PKTOPTIONS:
1023         {
1024                 struct msghdr msg;
1025                 struct sk_buff *skb;
1026
1027                 if (sk->sk_type != SOCK_STREAM)
1028                         return -ENOPROTOOPT;
1029
1030                 msg.msg_control = optval;
1031                 msg.msg_controllen = len;
1032                 msg.msg_flags = flags;
1033
1034                 lock_sock(sk);
1035                 skb = np->pktoptions;
1036                 if (skb)
1037                         ip6_datagram_recv_ctl(sk, &msg, skb);
1038                 release_sock(sk);
1039                 if (!skb) {
1040                         if (np->rxopt.bits.rxinfo) {
1041                                 struct in6_pktinfo src_info;
1042                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1043                                         np->sticky_pktinfo.ipi6_ifindex;
1044                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1045                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1046                         }
1047                         if (np->rxopt.bits.rxhlim) {
1048                                 int hlim = np->mcast_hops;
1049                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1050                         }
1051                         if (np->rxopt.bits.rxtclass) {
1052                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1053
1054                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1055                         }
1056                         if (np->rxopt.bits.rxoinfo) {
1057                                 struct in6_pktinfo src_info;
1058                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1059                                         np->sticky_pktinfo.ipi6_ifindex;
1060                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1061                                                                      np->sticky_pktinfo.ipi6_addr;
1062                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1063                         }
1064                         if (np->rxopt.bits.rxohlim) {
1065                                 int hlim = np->mcast_hops;
1066                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1067                         }
1068                         if (np->rxopt.bits.rxflow) {
1069                                 __be32 flowinfo = np->rcv_flowinfo;
1070
1071                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1072                         }
1073                 }
1074                 len -= msg.msg_controllen;
1075                 return put_user(len, optlen);
1076         }
1077         case IPV6_MTU:
1078         {
1079                 struct dst_entry *dst;
1080
1081                 val = 0;
1082                 rcu_read_lock();
1083                 dst = __sk_dst_get(sk);
1084                 if (dst)
1085                         val = dst_mtu(dst);
1086                 rcu_read_unlock();
1087                 if (!val)
1088                         return -ENOTCONN;
1089                 break;
1090         }
1091
1092         case IPV6_V6ONLY:
1093                 val = sk->sk_ipv6only;
1094                 break;
1095
1096         case IPV6_RECVPKTINFO:
1097                 val = np->rxopt.bits.rxinfo;
1098                 break;
1099
1100         case IPV6_2292PKTINFO:
1101                 val = np->rxopt.bits.rxoinfo;
1102                 break;
1103
1104         case IPV6_RECVHOPLIMIT:
1105                 val = np->rxopt.bits.rxhlim;
1106                 break;
1107
1108         case IPV6_2292HOPLIMIT:
1109                 val = np->rxopt.bits.rxohlim;
1110                 break;
1111
1112         case IPV6_RECVRTHDR:
1113                 val = np->rxopt.bits.srcrt;
1114                 break;
1115
1116         case IPV6_2292RTHDR:
1117                 val = np->rxopt.bits.osrcrt;
1118                 break;
1119
1120         case IPV6_HOPOPTS:
1121         case IPV6_RTHDRDSTOPTS:
1122         case IPV6_RTHDR:
1123         case IPV6_DSTOPTS:
1124         {
1125                 struct ipv6_txoptions *opt;
1126
1127                 lock_sock(sk);
1128                 opt = rcu_dereference_protected(np->opt,
1129                                                 lockdep_sock_is_held(sk));
1130                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1131                 release_sock(sk);
1132                 /* check if ipv6_getsockopt_sticky() returns err code */
1133                 if (len < 0)
1134                         return len;
1135                 return put_user(len, optlen);
1136         }
1137
1138         case IPV6_RECVHOPOPTS:
1139                 val = np->rxopt.bits.hopopts;
1140                 break;
1141
1142         case IPV6_2292HOPOPTS:
1143                 val = np->rxopt.bits.ohopopts;
1144                 break;
1145
1146         case IPV6_RECVDSTOPTS:
1147                 val = np->rxopt.bits.dstopts;
1148                 break;
1149
1150         case IPV6_2292DSTOPTS:
1151                 val = np->rxopt.bits.odstopts;
1152                 break;
1153
1154         case IPV6_TCLASS:
1155                 val = np->tclass;
1156                 break;
1157
1158         case IPV6_RECVTCLASS:
1159                 val = np->rxopt.bits.rxtclass;
1160                 break;
1161
1162         case IPV6_FLOWINFO:
1163                 val = np->rxopt.bits.rxflow;
1164                 break;
1165
1166         case IPV6_RECVPATHMTU:
1167                 val = np->rxopt.bits.rxpmtu;
1168                 break;
1169
1170         case IPV6_PATHMTU:
1171         {
1172                 struct dst_entry *dst;
1173                 struct ip6_mtuinfo mtuinfo;
1174
1175                 if (len < sizeof(mtuinfo))
1176                         return -EINVAL;
1177
1178                 len = sizeof(mtuinfo);
1179                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1180
1181                 rcu_read_lock();
1182                 dst = __sk_dst_get(sk);
1183                 if (dst)
1184                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1185                 rcu_read_unlock();
1186                 if (!mtuinfo.ip6m_mtu)
1187                         return -ENOTCONN;
1188
1189                 if (put_user(len, optlen))
1190                         return -EFAULT;
1191                 if (copy_to_user(optval, &mtuinfo, len))
1192                         return -EFAULT;
1193
1194                 return 0;
1195         }
1196
1197         case IPV6_TRANSPARENT:
1198                 val = inet_sk(sk)->transparent;
1199                 break;
1200
1201         case IPV6_RECVORIGDSTADDR:
1202                 val = np->rxopt.bits.rxorigdstaddr;
1203                 break;
1204
1205         case IPV6_UNICAST_HOPS:
1206         case IPV6_MULTICAST_HOPS:
1207         {
1208                 struct dst_entry *dst;
1209
1210                 if (optname == IPV6_UNICAST_HOPS)
1211                         val = np->hop_limit;
1212                 else
1213                         val = np->mcast_hops;
1214
1215                 if (val < 0) {
1216                         rcu_read_lock();
1217                         dst = __sk_dst_get(sk);
1218                         if (dst)
1219                                 val = ip6_dst_hoplimit(dst);
1220                         rcu_read_unlock();
1221                 }
1222
1223                 if (val < 0)
1224                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1225                 break;
1226         }
1227
1228         case IPV6_MULTICAST_LOOP:
1229                 val = np->mc_loop;
1230                 break;
1231
1232         case IPV6_MULTICAST_IF:
1233                 val = np->mcast_oif;
1234                 break;
1235
1236         case IPV6_UNICAST_IF:
1237                 val = (__force int)htonl((__u32) np->ucast_oif);
1238                 break;
1239
1240         case IPV6_MTU_DISCOVER:
1241                 val = np->pmtudisc;
1242                 break;
1243
1244         case IPV6_RECVERR:
1245                 val = np->recverr;
1246                 break;
1247
1248         case IPV6_FLOWINFO_SEND:
1249                 val = np->sndflow;
1250                 break;
1251
1252         case IPV6_FLOWLABEL_MGR:
1253         {
1254                 struct in6_flowlabel_req freq;
1255                 int flags;
1256
1257                 if (len < sizeof(freq))
1258                         return -EINVAL;
1259
1260                 if (copy_from_user(&freq, optval, sizeof(freq)))
1261                         return -EFAULT;
1262
1263                 if (freq.flr_action != IPV6_FL_A_GET)
1264                         return -EINVAL;
1265
1266                 len = sizeof(freq);
1267                 flags = freq.flr_flags;
1268
1269                 memset(&freq, 0, sizeof(freq));
1270
1271                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1272                 if (val < 0)
1273                         return val;
1274
1275                 if (put_user(len, optlen))
1276                         return -EFAULT;
1277                 if (copy_to_user(optval, &freq, len))
1278                         return -EFAULT;
1279
1280                 return 0;
1281         }
1282
1283         case IPV6_ADDR_PREFERENCES:
1284                 val = 0;
1285
1286                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1287                         val |= IPV6_PREFER_SRC_TMP;
1288                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1289                         val |= IPV6_PREFER_SRC_PUBLIC;
1290                 else {
1291                         /* XXX: should we return system default? */
1292                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1293                 }
1294
1295                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1296                         val |= IPV6_PREFER_SRC_COA;
1297                 else
1298                         val |= IPV6_PREFER_SRC_HOME;
1299                 break;
1300
1301         case IPV6_MINHOPCOUNT:
1302                 val = np->min_hopcount;
1303                 break;
1304
1305         case IPV6_DONTFRAG:
1306                 val = np->dontfrag;
1307                 break;
1308
1309         case IPV6_AUTOFLOWLABEL:
1310                 val = np->autoflowlabel;
1311                 break;
1312
1313         default:
1314                 return -ENOPROTOOPT;
1315         }
1316         len = min_t(unsigned int, sizeof(int), len);
1317         if (put_user(len, optlen))
1318                 return -EFAULT;
1319         if (copy_to_user(optval, &val, len))
1320                 return -EFAULT;
1321         return 0;
1322 }
1323
1324 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1325                     char __user *optval, int __user *optlen)
1326 {
1327         int err;
1328
1329         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1330                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1331
1332         if (level != SOL_IPV6)
1333                 return -ENOPROTOOPT;
1334
1335         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1336 #ifdef CONFIG_NETFILTER
1337         /* we need to exclude all possible ENOPROTOOPTs except default case */
1338         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1339                 int len;
1340
1341                 if (get_user(len, optlen))
1342                         return -EFAULT;
1343
1344                 lock_sock(sk);
1345                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1346                                 &len);
1347                 release_sock(sk);
1348                 if (err >= 0)
1349                         err = put_user(len, optlen);
1350         }
1351 #endif
1352         return err;
1353 }
1354 EXPORT_SYMBOL(ipv6_getsockopt);
1355
1356 #ifdef CONFIG_COMPAT
1357 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1358                            char __user *optval, int __user *optlen)
1359 {
1360         int err;
1361
1362         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1363                 if (udp_prot.compat_getsockopt != NULL)
1364                         return udp_prot.compat_getsockopt(sk, level, optname,
1365                                                           optval, optlen);
1366                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1367         }
1368
1369         if (level != SOL_IPV6)
1370                 return -ENOPROTOOPT;
1371
1372         if (optname == MCAST_MSFILTER)
1373                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1374                         ipv6_getsockopt);
1375
1376         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1377                                  MSG_CMSG_COMPAT);
1378 #ifdef CONFIG_NETFILTER
1379         /* we need to exclude all possible ENOPROTOOPTs except default case */
1380         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1381                 int len;
1382
1383                 if (get_user(len, optlen))
1384                         return -EFAULT;
1385
1386                 lock_sock(sk);
1387                 err = compat_nf_getsockopt(sk, PF_INET6,
1388                                            optname, optval, &len);
1389                 release_sock(sk);
1390                 if (err >= 0)
1391                         err = put_user(len, optlen);
1392         }
1393 #endif
1394         return err;
1395 }
1396 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1397 #endif
1398