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 static
 102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 103                                            struct ipv6_txoptions *opt)
 104 {
 105         if (inet_sk(sk)->is_icsk) {
 106                 if (opt &&
 107                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 108                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 109                         struct inet_connection_sock *icsk = inet_csk(sk);
 110                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 111                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 112                 }
 113         }
 114         opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
 115                    opt);
 116         sk_dst_reset(sk);
 117
 118         return opt;
 119 }
 120
 121 static bool setsockopt_needs_rtnl(int optname)
 122 {
 123         switch (optname) {
 124         case IPV6_ADDRFORM:
 125         case IPV6_ADD_MEMBERSHIP:
 126         case IPV6_DROP_MEMBERSHIP:
 127         case IPV6_JOIN_ANYCAST:
 128         case IPV6_LEAVE_ANYCAST:
 129         case MCAST_JOIN_GROUP:
 130         case MCAST_LEAVE_GROUP:
 131         case MCAST_JOIN_SOURCE_GROUP:
 132         case MCAST_LEAVE_SOURCE_GROUP:
 133         case MCAST_BLOCK_SOURCE:
 134         case MCAST_UNBLOCK_SOURCE:
 135         case MCAST_MSFILTER:
 136                 return true;
 137         }
 138         return false;
 139 }
 140
 141 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 142                     char __user *optval, unsigned int optlen)
 143 {
 144         struct ipv6_pinfo *np = inet6_sk(sk);
 145         struct net *net = sock_net(sk);
 146         int val, valbool;
 147         int retv = -ENOPROTOOPT;
 148         bool needs_rtnl = setsockopt_needs_rtnl(optname);
 149
 150         if (!optval)
 151                 val = 0;
 152         else {
 153                 if (optlen >= sizeof(int)) {
 154                         if (get_user(val, (int __user *) optval))
 155                                 return -EFAULT;
 156                 } else
 157                         val = 0;
 158         }
 159
 160         valbool = (val != 0);
 161
 162         if (ip6_mroute_opt(optname))
 163                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 164
 165         if (needs_rtnl)
 166                 rtnl_lock();
 167         lock_sock(sk);
 168
 169         switch (optname) {
 170
 171         case IPV6_ADDRFORM:
 172                 if (optlen < sizeof(int))
 173                         goto e_inval;
 174                 if (val == PF_INET) {
 175                         struct ipv6_txoptions *opt;
 176                         struct sk_buff *pktopt;
 177
 178                         if (sk->sk_type == SOCK_RAW)
 179                                 break;
 180
 181                         if (sk->sk_protocol == IPPROTO_UDP ||
 182                             sk->sk_protocol == IPPROTO_UDPLITE) {
 183                                 struct udp_sock *up = udp_sk(sk);
 184                                 if (up->pending == AF_INET6) {
 185                                         retv = -EBUSY;
 186                                         break;
 187                                 }
 188                         } else if (sk->sk_protocol == IPPROTO_TCP) {
 189                                 if (sk->sk_prot != &tcpv6_prot) {
 190                                         retv = -EBUSY;
 191                                         break;
 192                                 }
 193                         } else {
 194                                 break;
 195                         }
 196
 197                         if (sk->sk_state != TCP_ESTABLISHED) {
 198                                 retv = -ENOTCONN;
 199                                 break;
 200                         }
 201
 202                         if (ipv6_only_sock(sk) ||
 203                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 204                                 retv = -EADDRNOTAVAIL;
 205                                 break;
 206                         }
 207
 208                         fl6_free_socklist(sk);
 209                         __ipv6_sock_mc_close(sk);
 210                         __ipv6_sock_ac_close(sk);
 211
 212                         /*
 213                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 214                          * remove it from the refcnt debug socks count in the
 215                          * original family...
 216                          */
 217                         sk_refcnt_debug_dec(sk);
 218
 219                         if (sk->sk_protocol == IPPROTO_TCP) {
 220                                 struct inet_connection_sock *icsk = inet_csk(sk);
 221                                 local_bh_disable();
 222                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 223                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 224                                 local_bh_enable();
 225                                 sk->sk_prot = &tcp_prot;
 226                                 icsk->icsk_af_ops = &ipv4_specific;
 227                                 sk->sk_socket->ops = &inet_stream_ops;
 228                                 sk->sk_family = PF_INET;
 229                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 230                         } else {
 231                                 struct proto *prot = &udp_prot;
 232
 233                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 234                                         prot = &udplite_prot;
 235                                 local_bh_disable();
 236                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 237                                 sock_prot_inuse_add(net, prot, 1);
 238                                 local_bh_enable();
 239                                 sk->sk_prot = prot;
 240                                 sk->sk_socket->ops = &inet_dgram_ops;
 241                                 sk->sk_family = PF_INET;
 242                         }
 243                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
 244                                    NULL);
 245                         if (opt) {
 246                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 247                                 txopt_put(opt);
 248                         }
 249                         pktopt = xchg(&np->pktoptions, NULL);
 250                         kfree_skb(pktopt);
 251
 252                         sk->sk_destruct = inet_sock_destruct;
 253                         /*
 254                          * ... and add it to the refcnt debug socks count
 255                          * in the new family. -acme
 256                          */
 257                         sk_refcnt_debug_inc(sk);
 258                         module_put(THIS_MODULE);
 259                         retv = 0;
 260                         break;
 261                 }
 262                 goto e_inval;
 263
 264         case IPV6_V6ONLY:
 265                 if (optlen < sizeof(int) ||
 266                     inet_sk(sk)->inet_num)
 267                         goto e_inval;
 268                 sk->sk_ipv6only = valbool;
 269                 retv = 0;
 270                 break;
 271
 272         case IPV6_RECVPKTINFO:
 273                 if (optlen < sizeof(int))
 274                         goto e_inval;
 275                 np->rxopt.bits.rxinfo = valbool;
 276                 retv = 0;
 277                 break;
 278
 279         case IPV6_2292PKTINFO:
 280                 if (optlen < sizeof(int))
 281                         goto e_inval;
 282                 np->rxopt.bits.rxoinfo = valbool;
 283                 retv = 0;
 284                 break;
 285
 286         case IPV6_RECVHOPLIMIT:
 287                 if (optlen < sizeof(int))
 288                         goto e_inval;
 289                 np->rxopt.bits.rxhlim = valbool;
 290                 retv = 0;
 291                 break;
 292
 293         case IPV6_2292HOPLIMIT:
 294                 if (optlen < sizeof(int))
 295                         goto e_inval;
 296                 np->rxopt.bits.rxohlim = valbool;
 297                 retv = 0;
 298                 break;
 299
 300         case IPV6_RECVRTHDR:
 301                 if (optlen < sizeof(int))
 302                         goto e_inval;
 303                 np->rxopt.bits.srcrt = valbool;
 304                 retv = 0;
 305                 break;
 306
 307         case IPV6_2292RTHDR:
 308                 if (optlen < sizeof(int))
 309                         goto e_inval;
 310                 np->rxopt.bits.osrcrt = valbool;
 311                 retv = 0;
 312                 break;
 313
 314         case IPV6_RECVHOPOPTS:
 315                 if (optlen < sizeof(int))
 316                         goto e_inval;
 317                 np->rxopt.bits.hopopts = valbool;
 318                 retv = 0;
 319                 break;
 320
 321         case IPV6_2292HOPOPTS:
 322                 if (optlen < sizeof(int))
 323                         goto e_inval;
 324                 np->rxopt.bits.ohopopts = valbool;
 325                 retv = 0;
 326                 break;
 327
 328         case IPV6_RECVDSTOPTS:
 329                 if (optlen < sizeof(int))
 330                         goto e_inval;
 331                 np->rxopt.bits.dstopts = valbool;
 332                 retv = 0;
 333                 break;
 334
 335         case IPV6_2292DSTOPTS:
 336                 if (optlen < sizeof(int))
 337                         goto e_inval;
 338                 np->rxopt.bits.odstopts = valbool;
 339                 retv = 0;
 340                 break;
 341
 342         case IPV6_TCLASS:
 343                 if (optlen < sizeof(int))
 344                         goto e_inval;
 345                 if (val < -1 || val > 0xff)
 346                         goto e_inval;
 347                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 348                 if (val == -1)
 349                         val = 0;
 350                 np->tclass = val;
 351                 retv = 0;
 352                 break;
 353
 354         case IPV6_RECVTCLASS:
 355                 if (optlen < sizeof(int))
 356                         goto e_inval;
 357                 np->rxopt.bits.rxtclass = valbool;
 358                 retv = 0;
 359                 break;
 360
 361         case IPV6_FLOWINFO:
 362                 if (optlen < sizeof(int))
 363                         goto e_inval;
 364                 np->rxopt.bits.rxflow = valbool;
 365                 retv = 0;
 366                 break;
 367
 368         case IPV6_RECVPATHMTU:
 369                 if (optlen < sizeof(int))
 370                         goto e_inval;
 371                 np->rxopt.bits.rxpmtu = valbool;
 372                 retv = 0;
 373                 break;
 374
 375         case IPV6_TRANSPARENT:
 376                 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 377                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 378                         retv = -EPERM;
 379                         break;
 380                 }
 381                 if (optlen < sizeof(int))
 382                         goto e_inval;
 383                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 384                 inet_sk(sk)->transparent = valbool;
 385                 retv = 0;
 386                 break;
 387
 388         case IPV6_RECVORIGDSTADDR:
 389                 if (optlen < sizeof(int))
 390                         goto e_inval;
 391                 np->rxopt.bits.rxorigdstaddr = valbool;
 392                 retv = 0;
 393                 break;
 394
 395         case IPV6_HOPOPTS:
 396         case IPV6_RTHDRDSTOPTS:
 397         case IPV6_RTHDR:
 398         case IPV6_DSTOPTS:
 399         {
 400                 struct ipv6_txoptions *opt;
 401
 402                 /* remove any sticky options header with a zero option
 403                  * length, per RFC3542.
 404                  */
 405                 if (optlen == 0)
 406                         optval = NULL;
 407                 else if (!optval)
 408                         goto e_inval;
 409                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 410                          optlen & 0x7 || optlen > 8 * 255)
 411                         goto e_inval;
 412
 413                 /* hop-by-hop / destination options are privileged option */
 414                 retv = -EPERM;
 415                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 416                         break;
 417
 418                 opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk));
 419                 opt = ipv6_renew_options(sk, opt, optname,
 420                                          (struct ipv6_opt_hdr __user *)optval,
 421                                          optlen);
 422                 if (IS_ERR(opt)) {
 423                         retv = PTR_ERR(opt);
 424                         break;
 425                 }
 426
 427                 /* routing header option needs extra check */
 428                 retv = -EINVAL;
 429                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 430                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 431                         switch (rthdr->type) {
 432 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 433                         case IPV6_SRCRT_TYPE_2:
 434                                 if (rthdr->hdrlen != 2 ||
 435                                     rthdr->segments_left != 1)
 436                                         goto sticky_done;
 437
 438                                 break;
 439 #endif
 440                         default:
 441                                 goto sticky_done;
 442                         }
 443                 }
 444
 445                 retv = 0;
 446                 opt = ipv6_update_options(sk, opt);
 447 sticky_done:
 448                 if (opt) {
 449                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 450                         txopt_put(opt);
 451                 }
 452                 break;
 453         }
 454
 455         case IPV6_PKTINFO:
 456         {
 457                 struct in6_pktinfo pkt;
 458
 459                 if (optlen == 0)
 460                         goto e_inval;
 461                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 462                         goto e_inval;
 463
 464                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 465                                 retv = -EFAULT;
 466                                 break;
 467                 }
 468                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 469                         goto e_inval;
 470
 471                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 472                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 473                 retv = 0;
 474                 break;
 475         }
 476
 477         case IPV6_2292PKTOPTIONS:
 478         {
 479                 struct ipv6_txoptions *opt = NULL;
 480                 struct msghdr msg;
 481                 struct flowi6 fl6;
 482                 int junk;
 483
 484                 memset(&fl6, 0, sizeof(fl6));
 485                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 486                 fl6.flowi6_mark = sk->sk_mark;
 487
 488                 if (optlen == 0)
 489                         goto update;
 490
 491                 /* 1K is probably excessive
 492                  * 1K is surely not enough, 2K per standard header is 16K.
 493                  */
 494                 retv = -EINVAL;
 495                 if (optlen > 64*1024)
 496                         break;
 497
 498                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 499                 retv = -ENOBUFS;
 500                 if (!opt)
 501                         break;
 502
 503                 memset(opt, 0, sizeof(*opt));
 504                 atomic_set(&opt->refcnt, 1);
 505                 opt->tot_len = sizeof(*opt) + optlen;
 506                 retv = -EFAULT;
 507                 if (copy_from_user(opt+1, optval, optlen))
 508                         goto done;
 509
 510                 msg.msg_controllen = optlen;
 511                 msg.msg_control = (void *)(opt+1);
 512
 513                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk,
 514                                              &junk, &junk);
 515                 if (retv)
 516                         goto done;
 517 update:
 518                 retv = 0;
 519                 opt = ipv6_update_options(sk, opt);
 520 done:
 521                 if (opt) {
 522                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 523                         txopt_put(opt);
 524                 }
 525                 break;
 526         }
 527         case IPV6_UNICAST_HOPS:
 528                 if (optlen < sizeof(int))
 529                         goto e_inval;
 530                 if (val > 255 || val < -1)
 531                         goto e_inval;
 532                 np->hop_limit = val;
 533                 retv = 0;
 534                 break;
 535
 536         case IPV6_MULTICAST_HOPS:
 537                 if (sk->sk_type == SOCK_STREAM)
 538                         break;
 539                 if (optlen < sizeof(int))
 540                         goto e_inval;
 541                 if (val > 255 || val < -1)
 542                         goto e_inval;
 543                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 544                 retv = 0;
 545                 break;
 546
 547         case IPV6_MULTICAST_LOOP:
 548                 if (optlen < sizeof(int))
 549                         goto e_inval;
 550                 if (val != valbool)
 551                         goto e_inval;
 552                 np->mc_loop = valbool;
 553                 retv = 0;
 554                 break;
 555
 556         case IPV6_UNICAST_IF:
 557         {
 558                 struct net_device *dev = NULL;
 559                 int ifindex;
 560
 561                 if (optlen != sizeof(int))
 562                         goto e_inval;
 563
 564                 ifindex = (__force int)ntohl((__force __be32)val);
 565                 if (ifindex == 0) {
 566                         np->ucast_oif = 0;
 567                         retv = 0;
 568                         break;
 569                 }
 570
 571                 dev = dev_get_by_index(net, ifindex);
 572                 retv = -EADDRNOTAVAIL;
 573                 if (!dev)
 574                         break;
 575                 dev_put(dev);
 576
 577                 retv = -EINVAL;
 578                 if (sk->sk_bound_dev_if)
 579                         break;
 580
 581                 np->ucast_oif = ifindex;
 582                 retv = 0;
 583                 break;
 584         }
 585
 586         case IPV6_MULTICAST_IF:
 587                 if (sk->sk_type == SOCK_STREAM)
 588                         break;
 589                 if (optlen < sizeof(int))
 590                         goto e_inval;
 591
 592                 if (val) {
 593                         struct net_device *dev;
 594                         int midx;
 595
 596                         rcu_read_lock();
 597
 598                         dev = dev_get_by_index_rcu(net, val);
 599                         if (!dev) {
 600                                 rcu_read_unlock();
 601                                 retv = -ENODEV;
 602                                 break;
 603                         }
 604                         midx = l3mdev_master_ifindex_rcu(dev);
 605
 606                         rcu_read_unlock();
 607
 608                         if (sk->sk_bound_dev_if &&
 609                             sk->sk_bound_dev_if != val &&
 610                             (!midx || midx != sk->sk_bound_dev_if))
 611                                 goto e_inval;
 612                 }
 613                 np->mcast_oif = val;
 614                 retv = 0;
 615                 break;
 616         case IPV6_ADD_MEMBERSHIP:
 617         case IPV6_DROP_MEMBERSHIP:
 618         {
 619                 struct ipv6_mreq mreq;
 620
 621                 if (optlen < sizeof(struct ipv6_mreq))
 622                         goto e_inval;
 623
 624                 retv = -EPROTO;
 625                 if (inet_sk(sk)->is_icsk)
 626                         break;
 627
 628                 retv = -EFAULT;
 629                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 630                         break;
 631
 632                 if (optname == IPV6_ADD_MEMBERSHIP)
 633                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 634                 else
 635                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 636                 break;
 637         }
 638         case IPV6_JOIN_ANYCAST:
 639         case IPV6_LEAVE_ANYCAST:
 640         {
 641                 struct ipv6_mreq mreq;
 642
 643                 if (optlen < sizeof(struct ipv6_mreq))
 644                         goto e_inval;
 645
 646                 retv = -EFAULT;
 647                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 648                         break;
 649
 650                 if (optname == IPV6_JOIN_ANYCAST)
 651                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 652                 else
 653                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 654                 break;
 655         }
 656         case MCAST_JOIN_GROUP:
 657         case MCAST_LEAVE_GROUP:
 658         {
 659                 struct group_req greq;
 660                 struct sockaddr_in6 *psin6;
 661
 662                 if (optlen < sizeof(struct group_req))
 663                         goto e_inval;
 664
 665                 retv = -EFAULT;
 666                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 667                         break;
 668                 if (greq.gr_group.ss_family != AF_INET6) {
 669                         retv = -EADDRNOTAVAIL;
 670                         break;
 671                 }
 672                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 673                 if (optname == MCAST_JOIN_GROUP)
 674                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 675                                                  &psin6->sin6_addr);
 676                 else
 677                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 678                                                  &psin6->sin6_addr);
 679                 break;
 680         }
 681         case MCAST_JOIN_SOURCE_GROUP:
 682         case MCAST_LEAVE_SOURCE_GROUP:
 683         case MCAST_BLOCK_SOURCE:
 684         case MCAST_UNBLOCK_SOURCE:
 685         {
 686                 struct group_source_req greqs;
 687                 int omode, add;
 688
 689                 if (optlen < sizeof(struct group_source_req))
 690                         goto e_inval;
 691                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 692                         retv = -EFAULT;
 693                         break;
 694                 }
 695                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 696                     greqs.gsr_source.ss_family != AF_INET6) {
 697                         retv = -EADDRNOTAVAIL;
 698                         break;
 699                 }
 700                 if (optname == MCAST_BLOCK_SOURCE) {
 701                         omode = MCAST_EXCLUDE;
 702                         add = 1;
 703                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 704                         omode = MCAST_EXCLUDE;
 705                         add = 0;
 706                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 707                         struct sockaddr_in6 *psin6;
 708
 709                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 710                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 711                                                  &psin6->sin6_addr);
 712                         /* prior join w/ different source is ok */
 713                         if (retv && retv != -EADDRINUSE)
 714                                 break;
 715                         omode = MCAST_INCLUDE;
 716                         add = 1;
 717                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 718                         omode = MCAST_INCLUDE;
 719                         add = 0;
 720                 }
 721                 retv = ip6_mc_source(add, omode, sk, &greqs);
 722                 break;
 723         }
 724         case MCAST_MSFILTER:
 725         {
 726                 struct group_filter *gsf;
 727
 728                 if (optlen < GROUP_FILTER_SIZE(0))
 729                         goto e_inval;
 730                 if (optlen > sysctl_optmem_max) {
 731                         retv = -ENOBUFS;
 732                         break;
 733                 }
 734                 gsf = kmalloc(optlen, GFP_KERNEL);
 735                 if (!gsf) {
 736                         retv = -ENOBUFS;
 737                         break;
 738                 }
 739                 retv = -EFAULT;
 740                 if (copy_from_user(gsf, optval, optlen)) {
 741                         kfree(gsf);
 742                         break;
 743                 }
 744                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 745                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 746                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 747                         kfree(gsf);
 748                         retv = -ENOBUFS;
 749                         break;
 750                 }
 751                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 752                         kfree(gsf);
 753                         retv = -EINVAL;
 754                         break;
 755                 }
 756                 retv = ip6_mc_msfilter(sk, gsf);
 757                 kfree(gsf);
 758
 759                 break;
 760         }
 761         case IPV6_ROUTER_ALERT:
 762                 if (optlen < sizeof(int))
 763                         goto e_inval;
 764                 retv = ip6_ra_control(sk, val);
 765                 break;
 766         case IPV6_MTU_DISCOVER:
 767                 if (optlen < sizeof(int))
 768                         goto e_inval;
 769                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 770                         goto e_inval;
 771                 np->pmtudisc = val;
 772                 retv = 0;
 773                 break;
 774         case IPV6_MTU:
 775                 if (optlen < sizeof(int))
 776                         goto e_inval;
 777                 if (val && val < IPV6_MIN_MTU)
 778                         goto e_inval;
 779                 np->frag_size = val;
 780                 retv = 0;
 781                 break;
 782         case IPV6_RECVERR:
 783                 if (optlen < sizeof(int))
 784                         goto e_inval;
 785                 np->recverr = valbool;
 786                 if (!val)
 787                         skb_queue_purge(&sk->sk_error_queue);
 788                 retv = 0;
 789                 break;
 790         case IPV6_FLOWINFO_SEND:
 791                 if (optlen < sizeof(int))
 792                         goto e_inval;
 793                 np->sndflow = valbool;
 794                 retv = 0;
 795                 break;
 796         case IPV6_FLOWLABEL_MGR:
 797                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 798                 break;
 799         case IPV6_IPSEC_POLICY:
 800         case IPV6_XFRM_POLICY:
 801                 retv = -EPERM;
 802                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 803                         break;
 804                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 805                 break;
 806
 807         case IPV6_ADDR_PREFERENCES:
 808             {
 809                 unsigned int pref = 0;
 810                 unsigned int prefmask = ~0;
 811
 812                 if (optlen < sizeof(int))
 813                         goto e_inval;
 814
 815                 retv = -EINVAL;
 816
 817                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 818                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 819                                IPV6_PREFER_SRC_TMP|
 820                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 821                 case IPV6_PREFER_SRC_PUBLIC:
 822                         pref |= IPV6_PREFER_SRC_PUBLIC;
 823                         break;
 824                 case IPV6_PREFER_SRC_TMP:
 825                         pref |= IPV6_PREFER_SRC_TMP;
 826                         break;
 827                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 828                         break;
 829                 case 0:
 830                         goto pref_skip_pubtmp;
 831                 default:
 832                         goto e_inval;
 833                 }
 834
 835                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 836                               IPV6_PREFER_SRC_TMP);
 837 pref_skip_pubtmp:
 838
 839                 /* check HOME/COA conflicts */
 840                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 841                 case IPV6_PREFER_SRC_HOME:
 842                         break;
 843                 case IPV6_PREFER_SRC_COA:
 844                         pref |= IPV6_PREFER_SRC_COA;
 845                 case 0:
 846                         goto pref_skip_coa;
 847                 default:
 848                         goto e_inval;
 849                 }
 850
 851                 prefmask &= ~IPV6_PREFER_SRC_COA;
 852 pref_skip_coa:
 853
 854                 /* check CGA/NONCGA conflicts */
 855                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 856                 case IPV6_PREFER_SRC_CGA:
 857                 case IPV6_PREFER_SRC_NONCGA:
 858                 case 0:
 859                         break;
 860                 default:
 861                         goto e_inval;
 862                 }
 863
 864                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 865                 retv = 0;
 866
 867                 break;
 868             }
 869         case IPV6_MINHOPCOUNT:
 870                 if (optlen < sizeof(int))
 871                         goto e_inval;
 872                 if (val < 0 || val > 255)
 873                         goto e_inval;
 874                 np->min_hopcount = val;
 875                 retv = 0;
 876                 break;
 877         case IPV6_DONTFRAG:
 878                 np->dontfrag = valbool;
 879                 retv = 0;
 880                 break;
 881         case IPV6_AUTOFLOWLABEL:
 882                 np->autoflowlabel = valbool;
 883                 np->autoflowlabel_set = 1;
 884                 retv = 0;
 885                 break;
 886         }
 887
 888         release_sock(sk);
 889         if (needs_rtnl)
 890                 rtnl_unlock();
 891
 892         return retv;
 893
 894 e_inval:
 895         release_sock(sk);
 896         if (needs_rtnl)
 897                 rtnl_unlock();
 898         return -EINVAL;
 899 }
 900
 901 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 902                     char __user *optval, unsigned int optlen)
 903 {
 904         int err;
 905
 906         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 907                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 908
 909         if (level != SOL_IPV6)
 910                 return -ENOPROTOOPT;
 911
 912         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 913 #ifdef CONFIG_NETFILTER
 914         /* we need to exclude all possible ENOPROTOOPTs except default case */
 915         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 916                         optname != IPV6_XFRM_POLICY)
 917                 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
 918 #endif
 919         return err;
 920 }
 921 EXPORT_SYMBOL(ipv6_setsockopt);
 922
 923 #ifdef CONFIG_COMPAT
 924 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 925                            char __user *optval, unsigned int optlen)
 926 {
 927         int err;
 928
 929         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 930                 if (udp_prot.compat_setsockopt != NULL)
 931                         return udp_prot.compat_setsockopt(sk, level, optname,
 932                                                           optval, optlen);
 933                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 934         }
 935
 936         if (level != SOL_IPV6)
 937                 return -ENOPROTOOPT;
 938
 939         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 940                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 941                         ipv6_setsockopt);
 942
 943         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 944 #ifdef CONFIG_NETFILTER
 945         /* we need to exclude all possible ENOPROTOOPTs except default case */
 946         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 947             optname != IPV6_XFRM_POLICY)
 948                 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
 949                                            optlen);
 950 #endif
 951         return err;
 952 }
 953 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 954 #endif
 955
 956 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 957                                   int optname, char __user *optval, int len)
 958 {
 959         struct ipv6_opt_hdr *hdr;
 960
 961         if (!opt)
 962                 return 0;
 963
 964         switch (optname) {
 965         case IPV6_HOPOPTS:
 966                 hdr = opt->hopopt;
 967                 break;
 968         case IPV6_RTHDRDSTOPTS:
 969                 hdr = opt->dst0opt;
 970                 break;
 971         case IPV6_RTHDR:
 972                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 973                 break;
 974         case IPV6_DSTOPTS:
 975                 hdr = opt->dst1opt;
 976                 break;
 977         default:
 978                 return -EINVAL; /* should not happen */
 979         }
 980
 981         if (!hdr)
 982                 return 0;
 983
 984         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 985         if (copy_to_user(optval, hdr, len))
 986                 return -EFAULT;
 987         return len;
 988 }
 989
 990 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 991                     char __user *optval, int __user *optlen, unsigned int flags)
 992 {
 993         struct ipv6_pinfo *np = inet6_sk(sk);
 994         int len;
 995         int val;
 996
 997         if (ip6_mroute_opt(optname))
 998                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 999
1000         if (get_user(len, optlen))
1001                 return -EFAULT;
1002         switch (optname) {
1003         case IPV6_ADDRFORM:
1004                 if (sk->sk_protocol != IPPROTO_UDP &&
1005                     sk->sk_protocol != IPPROTO_UDPLITE &&
1006                     sk->sk_protocol != IPPROTO_TCP)
1007                         return -ENOPROTOOPT;
1008                 if (sk->sk_state != TCP_ESTABLISHED)
1009                         return -ENOTCONN;
1010                 val = sk->sk_family;
1011                 break;
1012         case MCAST_MSFILTER:
1013         {
1014                 struct group_filter gsf;
1015                 int err;
1016
1017                 if (len < GROUP_FILTER_SIZE(0))
1018                         return -EINVAL;
1019                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1020                         return -EFAULT;
1021                 if (gsf.gf_group.ss_family != AF_INET6)
1022                         return -EADDRNOTAVAIL;
1023                 lock_sock(sk);
1024                 err = ip6_mc_msfget(sk, &gsf,
1025                         (struct group_filter __user *)optval, optlen);
1026                 release_sock(sk);
1027                 return err;
1028         }
1029
1030         case IPV6_2292PKTOPTIONS:
1031         {
1032                 struct msghdr msg;
1033                 struct sk_buff *skb;
1034
1035                 if (sk->sk_type != SOCK_STREAM)
1036                         return -ENOPROTOOPT;
1037
1038                 msg.msg_control = optval;
1039                 msg.msg_controllen = len;
1040                 msg.msg_flags = flags;
1041
1042                 lock_sock(sk);
1043                 skb = np->pktoptions;
1044                 if (skb)
1045                         ip6_datagram_recv_ctl(sk, &msg, skb);
1046                 release_sock(sk);
1047                 if (!skb) {
1048                         if (np->rxopt.bits.rxinfo) {
1049                                 struct in6_pktinfo src_info;
1050                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1051                                         np->sticky_pktinfo.ipi6_ifindex;
1052                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1053                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1054                         }
1055                         if (np->rxopt.bits.rxhlim) {
1056                                 int hlim = np->mcast_hops;
1057                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1058                         }
1059                         if (np->rxopt.bits.rxtclass) {
1060                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1061
1062                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1063                         }
1064                         if (np->rxopt.bits.rxoinfo) {
1065                                 struct in6_pktinfo src_info;
1066                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1067                                         np->sticky_pktinfo.ipi6_ifindex;
1068                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1069                                                                      np->sticky_pktinfo.ipi6_addr;
1070                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1071                         }
1072                         if (np->rxopt.bits.rxohlim) {
1073                                 int hlim = np->mcast_hops;
1074                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1075                         }
1076                         if (np->rxopt.bits.rxflow) {
1077                                 __be32 flowinfo = np->rcv_flowinfo;
1078
1079                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1080                         }
1081                 }
1082                 len -= msg.msg_controllen;
1083                 return put_user(len, optlen);
1084         }
1085         case IPV6_MTU:
1086         {
1087                 struct dst_entry *dst;
1088
1089                 val = 0;
1090                 rcu_read_lock();
1091                 dst = __sk_dst_get(sk);
1092                 if (dst)
1093                         val = dst_mtu(dst);
1094                 rcu_read_unlock();
1095                 if (!val)
1096                         return -ENOTCONN;
1097                 break;
1098         }
1099
1100         case IPV6_V6ONLY:
1101                 val = sk->sk_ipv6only;
1102                 break;
1103
1104         case IPV6_RECVPKTINFO:
1105                 val = np->rxopt.bits.rxinfo;
1106                 break;
1107
1108         case IPV6_2292PKTINFO:
1109                 val = np->rxopt.bits.rxoinfo;
1110                 break;
1111
1112         case IPV6_RECVHOPLIMIT:
1113                 val = np->rxopt.bits.rxhlim;
1114                 break;
1115
1116         case IPV6_2292HOPLIMIT:
1117                 val = np->rxopt.bits.rxohlim;
1118                 break;
1119
1120         case IPV6_RECVRTHDR:
1121                 val = np->rxopt.bits.srcrt;
1122                 break;
1123
1124         case IPV6_2292RTHDR:
1125                 val = np->rxopt.bits.osrcrt;
1126                 break;
1127
1128         case IPV6_HOPOPTS:
1129         case IPV6_RTHDRDSTOPTS:
1130         case IPV6_RTHDR:
1131         case IPV6_DSTOPTS:
1132         {
1133                 struct ipv6_txoptions *opt;
1134
1135                 lock_sock(sk);
1136                 opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk));
1137                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1138                 release_sock(sk);
1139                 /* check if ipv6_getsockopt_sticky() returns err code */
1140                 if (len < 0)
1141                         return len;
1142                 return put_user(len, optlen);
1143         }
1144
1145         case IPV6_RECVHOPOPTS:
1146                 val = np->rxopt.bits.hopopts;
1147                 break;
1148
1149         case IPV6_2292HOPOPTS:
1150                 val = np->rxopt.bits.ohopopts;
1151                 break;
1152
1153         case IPV6_RECVDSTOPTS:
1154                 val = np->rxopt.bits.dstopts;
1155                 break;
1156
1157         case IPV6_2292DSTOPTS:
1158                 val = np->rxopt.bits.odstopts;
1159                 break;
1160
1161         case IPV6_TCLASS:
1162                 val = np->tclass;
1163                 break;
1164
1165         case IPV6_RECVTCLASS:
1166                 val = np->rxopt.bits.rxtclass;
1167                 break;
1168
1169         case IPV6_FLOWINFO:
1170                 val = np->rxopt.bits.rxflow;
1171                 break;
1172
1173         case IPV6_RECVPATHMTU:
1174                 val = np->rxopt.bits.rxpmtu;
1175                 break;
1176
1177         case IPV6_PATHMTU:
1178         {
1179                 struct dst_entry *dst;
1180                 struct ip6_mtuinfo mtuinfo;
1181
1182                 if (len < sizeof(mtuinfo))
1183                         return -EINVAL;
1184
1185                 len = sizeof(mtuinfo);
1186                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1187
1188                 rcu_read_lock();
1189                 dst = __sk_dst_get(sk);
1190                 if (dst)
1191                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1192                 rcu_read_unlock();
1193                 if (!mtuinfo.ip6m_mtu)
1194                         return -ENOTCONN;
1195
1196                 if (put_user(len, optlen))
1197                         return -EFAULT;
1198                 if (copy_to_user(optval, &mtuinfo, len))
1199                         return -EFAULT;
1200
1201                 return 0;
1202         }
1203
1204         case IPV6_TRANSPARENT:
1205                 val = inet_sk(sk)->transparent;
1206                 break;
1207
1208         case IPV6_RECVORIGDSTADDR:
1209                 val = np->rxopt.bits.rxorigdstaddr;
1210                 break;
1211
1212         case IPV6_UNICAST_HOPS:
1213         case IPV6_MULTICAST_HOPS:
1214         {
1215                 struct dst_entry *dst;
1216
1217                 if (optname == IPV6_UNICAST_HOPS)
1218                         val = np->hop_limit;
1219                 else
1220                         val = np->mcast_hops;
1221
1222                 if (val < 0) {
1223                         rcu_read_lock();
1224                         dst = __sk_dst_get(sk);
1225                         if (dst)
1226                                 val = ip6_dst_hoplimit(dst);
1227                         rcu_read_unlock();
1228                 }
1229
1230                 if (val < 0)
1231                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1232                 break;
1233         }
1234
1235         case IPV6_MULTICAST_LOOP:
1236                 val = np->mc_loop;
1237                 break;
1238
1239         case IPV6_MULTICAST_IF:
1240                 val = np->mcast_oif;
1241                 break;
1242
1243         case IPV6_UNICAST_IF:
1244                 val = (__force int)htonl((__u32) np->ucast_oif);
1245                 break;
1246
1247         case IPV6_MTU_DISCOVER:
1248                 val = np->pmtudisc;
1249                 break;
1250
1251         case IPV6_RECVERR:
1252                 val = np->recverr;
1253                 break;
1254
1255         case IPV6_FLOWINFO_SEND:
1256                 val = np->sndflow;
1257                 break;
1258
1259         case IPV6_FLOWLABEL_MGR:
1260         {
1261                 struct in6_flowlabel_req freq;
1262                 int flags;
1263
1264                 if (len < sizeof(freq))
1265                         return -EINVAL;
1266
1267                 if (copy_from_user(&freq, optval, sizeof(freq)))
1268                         return -EFAULT;
1269
1270                 if (freq.flr_action != IPV6_FL_A_GET)
1271                         return -EINVAL;
1272
1273                 len = sizeof(freq);
1274                 flags = freq.flr_flags;
1275
1276                 memset(&freq, 0, sizeof(freq));
1277
1278                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1279                 if (val < 0)
1280                         return val;
1281
1282                 if (put_user(len, optlen))
1283                         return -EFAULT;
1284                 if (copy_to_user(optval, &freq, len))
1285                         return -EFAULT;
1286
1287                 return 0;
1288         }
1289
1290         case IPV6_ADDR_PREFERENCES:
1291                 val = 0;
1292
1293                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1294                         val |= IPV6_PREFER_SRC_TMP;
1295                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1296                         val |= IPV6_PREFER_SRC_PUBLIC;
1297                 else {
1298                         /* XXX: should we return system default? */
1299                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1300                 }
1301
1302                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1303                         val |= IPV6_PREFER_SRC_COA;
1304                 else
1305                         val |= IPV6_PREFER_SRC_HOME;
1306                 break;
1307
1308         case IPV6_MINHOPCOUNT:
1309                 val = np->min_hopcount;
1310                 break;
1311
1312         case IPV6_DONTFRAG:
1313                 val = np->dontfrag;
1314                 break;
1315
1316         case IPV6_AUTOFLOWLABEL:
1317                 val = ip6_autoflowlabel(sock_net(sk), np);
1318                 break;
1319
1320         default:
1321                 return -ENOPROTOOPT;
1322         }
1323         len = min_t(unsigned int, sizeof(int), len);
1324         if (put_user(len, optlen))
1325                 return -EFAULT;
1326         if (copy_to_user(optval, &val, len))
1327                 return -EFAULT;
1328         return 0;
1329 }
1330
1331 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1332                     char __user *optval, int __user *optlen)
1333 {
1334         int err;
1335
1336         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1337                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1338
1339         if (level != SOL_IPV6)
1340                 return -ENOPROTOOPT;
1341
1342         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1343 #ifdef CONFIG_NETFILTER
1344         /* we need to exclude all possible ENOPROTOOPTs except default case */
1345         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1346                 int len;
1347
1348                 if (get_user(len, optlen))
1349                         return -EFAULT;
1350
1351                 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1352                 if (err >= 0)
1353                         err = put_user(len, optlen);
1354         }
1355 #endif
1356         return err;
1357 }
1358 EXPORT_SYMBOL(ipv6_getsockopt);
1359
1360 #ifdef CONFIG_COMPAT
1361 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1362                            char __user *optval, int __user *optlen)
1363 {
1364         int err;
1365
1366         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1367                 if (udp_prot.compat_getsockopt != NULL)
1368                         return udp_prot.compat_getsockopt(sk, level, optname,
1369                                                           optval, optlen);
1370                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1371         }
1372
1373         if (level != SOL_IPV6)
1374                 return -ENOPROTOOPT;
1375
1376         if (optname == MCAST_MSFILTER)
1377                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1378                         ipv6_getsockopt);
1379
1380         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1381                                  MSG_CMSG_COMPAT);
1382 #ifdef CONFIG_NETFILTER
1383         /* we need to exclude all possible ENOPROTOOPTs except default case */
1384         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1385                 int len;
1386
1387                 if (get_user(len, optlen))
1388                         return -EFAULT;
1389
1390                 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1391                 if (err >= 0)
1392                         err = put_user(len, optlen);
1393         }
1394 #endif
1395         return err;
1396 }
1397 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1398 #endif
1399