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 #include <net/seg6.h>
  56
  57 #include <linux/uaccess.h>
  58
  59 struct ip6_ra_chain *ip6_ra_chain;
  60 DEFINE_RWLOCK(ip6_ra_lock);
  61
  62 int ip6_ra_control(struct sock *sk, int sel)
  63 {
  64         struct ip6_ra_chain *ra, *new_ra, **rap;
  65
  66         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  67         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  68                 return -ENOPROTOOPT;
  69
  70         new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  71
  72         write_lock_bh(&ip6_ra_lock);
  73         for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
  74                 if (ra->sk == sk) {
  75                         if (sel >= 0) {
  76                                 write_unlock_bh(&ip6_ra_lock);
  77                                 kfree(new_ra);
  78                                 return -EADDRINUSE;
  79                         }
  80
  81                         *rap = ra->next;
  82                         write_unlock_bh(&ip6_ra_lock);
  83
  84                         sock_put(sk);
  85                         kfree(ra);
  86                         return 0;
  87                 }
  88         }
  89         if (!new_ra) {
  90                 write_unlock_bh(&ip6_ra_lock);
  91                 return -ENOBUFS;
  92         }
  93         new_ra->sk = sk;
  94         new_ra->sel = sel;
  95         new_ra->next = ra;
  96         *rap = new_ra;
  97         sock_hold(sk);
  98         write_unlock_bh(&ip6_ra_lock);
  99         return 0;
 100 }
 101
 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                                 break;
 190
 191                         if (sk->sk_state != TCP_ESTABLISHED) {
 192                                 retv = -ENOTCONN;
 193                                 break;
 194                         }
 195
 196                         if (ipv6_only_sock(sk) ||
 197                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 198                                 retv = -EADDRNOTAVAIL;
 199                                 break;
 200                         }
 201
 202                         fl6_free_socklist(sk);
 203                         __ipv6_sock_mc_close(sk);
 204
 205                         /*
 206                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 207                          * remove it from the refcnt debug socks count in the
 208                          * original family...
 209                          */
 210                         sk_refcnt_debug_dec(sk);
 211
 212                         if (sk->sk_protocol == IPPROTO_TCP) {
 213                                 struct inet_connection_sock *icsk = inet_csk(sk);
 214                                 local_bh_disable();
 215                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 216                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 217                                 local_bh_enable();
 218                                 sk->sk_prot = &tcp_prot;
 219                                 icsk->icsk_af_ops = &ipv4_specific;
 220                                 sk->sk_socket->ops = &inet_stream_ops;
 221                                 sk->sk_family = PF_INET;
 222                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 223                         } else {
 224                                 struct proto *prot = &udp_prot;
 225
 226                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 227                                         prot = &udplite_prot;
 228                                 local_bh_disable();
 229                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 230                                 sock_prot_inuse_add(net, prot, 1);
 231                                 local_bh_enable();
 232                                 sk->sk_prot = prot;
 233                                 sk->sk_socket->ops = &inet_dgram_ops;
 234                                 sk->sk_family = PF_INET;
 235                         }
 236                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
 237                                    NULL);
 238                         if (opt) {
 239                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 240                                 txopt_put(opt);
 241                         }
 242                         pktopt = xchg(&np->pktoptions, NULL);
 243                         kfree_skb(pktopt);
 244
 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                         case IPV6_SRCRT_TYPE_4:
 434                         {
 435                                 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
 436                                                           opt->srcrt;
 437
 438                                 if (!seg6_validate_srh(srh, optlen))
 439                                         goto sticky_done;
 440                                 break;
 441                         }
 442                         default:
 443                                 goto sticky_done;
 444                         }
 445                 }
 446
 447                 retv = 0;
 448                 opt = ipv6_update_options(sk, opt);
 449 sticky_done:
 450                 if (opt) {
 451                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 452                         txopt_put(opt);
 453                 }
 454                 break;
 455         }
 456
 457         case IPV6_PKTINFO:
 458         {
 459                 struct in6_pktinfo pkt;
 460
 461                 if (optlen == 0)
 462                         goto e_inval;
 463                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 464                         goto e_inval;
 465
 466                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 467                                 retv = -EFAULT;
 468                                 break;
 469                 }
 470                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 471                         goto e_inval;
 472
 473                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 474                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 475                 retv = 0;
 476                 break;
 477         }
 478
 479         case IPV6_2292PKTOPTIONS:
 480         {
 481                 struct ipv6_txoptions *opt = NULL;
 482                 struct msghdr msg;
 483                 struct flowi6 fl6;
 484                 struct sockcm_cookie sockc_junk;
 485                 struct ipcm6_cookie ipc6;
 486
 487                 memset(&fl6, 0, sizeof(fl6));
 488                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 489                 fl6.flowi6_mark = sk->sk_mark;
 490
 491                 if (optlen == 0)
 492                         goto update;
 493
 494                 /* 1K is probably excessive
 495                  * 1K is surely not enough, 2K per standard header is 16K.
 496                  */
 497                 retv = -EINVAL;
 498                 if (optlen > 64*1024)
 499                         break;
 500
 501                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 502                 retv = -ENOBUFS;
 503                 if (!opt)
 504                         break;
 505
 506                 memset(opt, 0, sizeof(*opt));
 507                 refcount_set(&opt->refcnt, 1);
 508                 opt->tot_len = sizeof(*opt) + optlen;
 509                 retv = -EFAULT;
 510                 if (copy_from_user(opt+1, optval, optlen))
 511                         goto done;
 512
 513                 msg.msg_controllen = optlen;
 514                 msg.msg_control = (void *)(opt+1);
 515                 ipc6.opt = opt;
 516
 517                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
 518                 if (retv)
 519                         goto done;
 520 update:
 521                 retv = 0;
 522                 opt = ipv6_update_options(sk, opt);
 523 done:
 524                 if (opt) {
 525                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 526                         txopt_put(opt);
 527                 }
 528                 break;
 529         }
 530         case IPV6_UNICAST_HOPS:
 531                 if (optlen < sizeof(int))
 532                         goto e_inval;
 533                 if (val > 255 || val < -1)
 534                         goto e_inval;
 535                 np->hop_limit = val;
 536                 retv = 0;
 537                 break;
 538
 539         case IPV6_MULTICAST_HOPS:
 540                 if (sk->sk_type == SOCK_STREAM)
 541                         break;
 542                 if (optlen < sizeof(int))
 543                         goto e_inval;
 544                 if (val > 255 || val < -1)
 545                         goto e_inval;
 546                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 547                 retv = 0;
 548                 break;
 549
 550         case IPV6_MULTICAST_LOOP:
 551                 if (optlen < sizeof(int))
 552                         goto e_inval;
 553                 if (val != valbool)
 554                         goto e_inval;
 555                 np->mc_loop = valbool;
 556                 retv = 0;
 557                 break;
 558
 559         case IPV6_UNICAST_IF:
 560         {
 561                 struct net_device *dev = NULL;
 562                 int ifindex;
 563
 564                 if (optlen != sizeof(int))
 565                         goto e_inval;
 566
 567                 ifindex = (__force int)ntohl((__force __be32)val);
 568                 if (ifindex == 0) {
 569                         np->ucast_oif = 0;
 570                         retv = 0;
 571                         break;
 572                 }
 573
 574                 dev = dev_get_by_index(net, ifindex);
 575                 retv = -EADDRNOTAVAIL;
 576                 if (!dev)
 577                         break;
 578                 dev_put(dev);
 579
 580                 retv = -EINVAL;
 581                 if (sk->sk_bound_dev_if)
 582                         break;
 583
 584                 np->ucast_oif = ifindex;
 585                 retv = 0;
 586                 break;
 587         }
 588
 589         case IPV6_MULTICAST_IF:
 590                 if (sk->sk_type == SOCK_STREAM)
 591                         break;
 592                 if (optlen < sizeof(int))
 593                         goto e_inval;
 594
 595                 if (val) {
 596                         struct net_device *dev;
 597                         int midx;
 598
 599                         rcu_read_lock();
 600
 601                         dev = dev_get_by_index_rcu(net, val);
 602                         if (!dev) {
 603                                 rcu_read_unlock();
 604                                 retv = -ENODEV;
 605                                 break;
 606                         }
 607                         midx = l3mdev_master_ifindex_rcu(dev);
 608
 609                         rcu_read_unlock();
 610
 611                         if (sk->sk_bound_dev_if &&
 612                             sk->sk_bound_dev_if != val &&
 613                             (!midx || midx != sk->sk_bound_dev_if))
 614                                 goto e_inval;
 615                 }
 616                 np->mcast_oif = val;
 617                 retv = 0;
 618                 break;
 619         case IPV6_ADD_MEMBERSHIP:
 620         case IPV6_DROP_MEMBERSHIP:
 621         {
 622                 struct ipv6_mreq mreq;
 623
 624                 if (optlen < sizeof(struct ipv6_mreq))
 625                         goto e_inval;
 626
 627                 retv = -EPROTO;
 628                 if (inet_sk(sk)->is_icsk)
 629                         break;
 630
 631                 retv = -EFAULT;
 632                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 633                         break;
 634
 635                 if (optname == IPV6_ADD_MEMBERSHIP)
 636                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 637                 else
 638                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 639                 break;
 640         }
 641         case IPV6_JOIN_ANYCAST:
 642         case IPV6_LEAVE_ANYCAST:
 643         {
 644                 struct ipv6_mreq mreq;
 645
 646                 if (optlen < sizeof(struct ipv6_mreq))
 647                         goto e_inval;
 648
 649                 retv = -EFAULT;
 650                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 651                         break;
 652
 653                 if (optname == IPV6_JOIN_ANYCAST)
 654                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 655                 else
 656                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 657                 break;
 658         }
 659         case MCAST_JOIN_GROUP:
 660         case MCAST_LEAVE_GROUP:
 661         {
 662                 struct group_req greq;
 663                 struct sockaddr_in6 *psin6;
 664
 665                 if (optlen < sizeof(struct group_req))
 666                         goto e_inval;
 667
 668                 retv = -EFAULT;
 669                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 670                         break;
 671                 if (greq.gr_group.ss_family != AF_INET6) {
 672                         retv = -EADDRNOTAVAIL;
 673                         break;
 674                 }
 675                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 676                 if (optname == MCAST_JOIN_GROUP)
 677                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 678                                                  &psin6->sin6_addr);
 679                 else
 680                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 681                                                  &psin6->sin6_addr);
 682                 break;
 683         }
 684         case MCAST_JOIN_SOURCE_GROUP:
 685         case MCAST_LEAVE_SOURCE_GROUP:
 686         case MCAST_BLOCK_SOURCE:
 687         case MCAST_UNBLOCK_SOURCE:
 688         {
 689                 struct group_source_req greqs;
 690                 int omode, add;
 691
 692                 if (optlen < sizeof(struct group_source_req))
 693                         goto e_inval;
 694                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 695                         retv = -EFAULT;
 696                         break;
 697                 }
 698                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 699                     greqs.gsr_source.ss_family != AF_INET6) {
 700                         retv = -EADDRNOTAVAIL;
 701                         break;
 702                 }
 703                 if (optname == MCAST_BLOCK_SOURCE) {
 704                         omode = MCAST_EXCLUDE;
 705                         add = 1;
 706                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 707                         omode = MCAST_EXCLUDE;
 708                         add = 0;
 709                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 710                         struct sockaddr_in6 *psin6;
 711
 712                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 713                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 714                                                  &psin6->sin6_addr);
 715                         /* prior join w/ different source is ok */
 716                         if (retv && retv != -EADDRINUSE)
 717                                 break;
 718                         omode = MCAST_INCLUDE;
 719                         add = 1;
 720                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 721                         omode = MCAST_INCLUDE;
 722                         add = 0;
 723                 }
 724                 retv = ip6_mc_source(add, omode, sk, &greqs);
 725                 break;
 726         }
 727         case MCAST_MSFILTER:
 728         {
 729                 struct group_filter *gsf;
 730
 731                 if (optlen < GROUP_FILTER_SIZE(0))
 732                         goto e_inval;
 733                 if (optlen > sysctl_optmem_max) {
 734                         retv = -ENOBUFS;
 735                         break;
 736                 }
 737                 gsf = memdup_user(optval, optlen);
 738                 if (IS_ERR(gsf)) {
 739                         retv = PTR_ERR(gsf);
 740                         break;
 741                 }
 742                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 743                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 744                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 745                         kfree(gsf);
 746                         retv = -ENOBUFS;
 747                         break;
 748                 }
 749                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 750                         kfree(gsf);
 751                         retv = -EINVAL;
 752                         break;
 753                 }
 754                 retv = ip6_mc_msfilter(sk, gsf);
 755                 kfree(gsf);
 756
 757                 break;
 758         }
 759         case IPV6_ROUTER_ALERT:
 760                 if (optlen < sizeof(int))
 761                         goto e_inval;
 762                 retv = ip6_ra_control(sk, val);
 763                 break;
 764         case IPV6_MTU_DISCOVER:
 765                 if (optlen < sizeof(int))
 766                         goto e_inval;
 767                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 768                         goto e_inval;
 769                 np->pmtudisc = val;
 770                 retv = 0;
 771                 break;
 772         case IPV6_MTU:
 773                 if (optlen < sizeof(int))
 774                         goto e_inval;
 775                 if (val && val < IPV6_MIN_MTU)
 776                         goto e_inval;
 777                 np->frag_size = val;
 778                 retv = 0;
 779                 break;
 780         case IPV6_RECVERR:
 781                 if (optlen < sizeof(int))
 782                         goto e_inval;
 783                 np->recverr = valbool;
 784                 if (!val)
 785                         skb_queue_purge(&sk->sk_error_queue);
 786                 retv = 0;
 787                 break;
 788         case IPV6_FLOWINFO_SEND:
 789                 if (optlen < sizeof(int))
 790                         goto e_inval;
 791                 np->sndflow = valbool;
 792                 retv = 0;
 793                 break;
 794         case IPV6_FLOWLABEL_MGR:
 795                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 796                 break;
 797         case IPV6_IPSEC_POLICY:
 798         case IPV6_XFRM_POLICY:
 799                 retv = -EPERM;
 800                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 801                         break;
 802                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 803                 break;
 804
 805         case IPV6_ADDR_PREFERENCES:
 806             {
 807                 unsigned int pref = 0;
 808                 unsigned int prefmask = ~0;
 809
 810                 if (optlen < sizeof(int))
 811                         goto e_inval;
 812
 813                 retv = -EINVAL;
 814
 815                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 816                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 817                                IPV6_PREFER_SRC_TMP|
 818                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 819                 case IPV6_PREFER_SRC_PUBLIC:
 820                         pref |= IPV6_PREFER_SRC_PUBLIC;
 821                         break;
 822                 case IPV6_PREFER_SRC_TMP:
 823                         pref |= IPV6_PREFER_SRC_TMP;
 824                         break;
 825                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 826                         break;
 827                 case 0:
 828                         goto pref_skip_pubtmp;
 829                 default:
 830                         goto e_inval;
 831                 }
 832
 833                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 834                               IPV6_PREFER_SRC_TMP);
 835 pref_skip_pubtmp:
 836
 837                 /* check HOME/COA conflicts */
 838                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 839                 case IPV6_PREFER_SRC_HOME:
 840                         break;
 841                 case IPV6_PREFER_SRC_COA:
 842                         pref |= IPV6_PREFER_SRC_COA;
 843                 case 0:
 844                         goto pref_skip_coa;
 845                 default:
 846                         goto e_inval;
 847                 }
 848
 849                 prefmask &= ~IPV6_PREFER_SRC_COA;
 850 pref_skip_coa:
 851
 852                 /* check CGA/NONCGA conflicts */
 853                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 854                 case IPV6_PREFER_SRC_CGA:
 855                 case IPV6_PREFER_SRC_NONCGA:
 856                 case 0:
 857                         break;
 858                 default:
 859                         goto e_inval;
 860                 }
 861
 862                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 863                 retv = 0;
 864
 865                 break;
 866             }
 867         case IPV6_MINHOPCOUNT:
 868                 if (optlen < sizeof(int))
 869                         goto e_inval;
 870                 if (val < 0 || val > 255)
 871                         goto e_inval;
 872                 np->min_hopcount = val;
 873                 retv = 0;
 874                 break;
 875         case IPV6_DONTFRAG:
 876                 np->dontfrag = valbool;
 877                 retv = 0;
 878                 break;
 879         case IPV6_AUTOFLOWLABEL:
 880                 np->autoflowlabel = valbool;
 881                 retv = 0;
 882                 break;
 883         case IPV6_RECVFRAGSIZE:
 884                 np->rxopt.bits.recvfragsize = valbool;
 885                 retv = 0;
 886                 break;
 887         }
 888
 889         release_sock(sk);
 890         if (needs_rtnl)
 891                 rtnl_unlock();
 892
 893         return retv;
 894
 895 e_inval:
 896         release_sock(sk);
 897         if (needs_rtnl)
 898                 rtnl_unlock();
 899         return -EINVAL;
 900 }
 901
 902 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 903                     char __user *optval, unsigned int optlen)
 904 {
 905         int err;
 906
 907         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 908                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 909
 910         if (level != SOL_IPV6)
 911                 return -ENOPROTOOPT;
 912
 913         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 914 #ifdef CONFIG_NETFILTER
 915         /* we need to exclude all possible ENOPROTOOPTs except default case */
 916         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 917                         optname != IPV6_XFRM_POLICY) {
 918                 lock_sock(sk);
 919                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 920                                 optlen);
 921                 release_sock(sk);
 922         }
 923 #endif
 924         return err;
 925 }
 926 EXPORT_SYMBOL(ipv6_setsockopt);
 927
 928 #ifdef CONFIG_COMPAT
 929 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 930                            char __user *optval, unsigned int optlen)
 931 {
 932         int err;
 933
 934         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 935                 if (udp_prot.compat_setsockopt != NULL)
 936                         return udp_prot.compat_setsockopt(sk, level, optname,
 937                                                           optval, optlen);
 938                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 939         }
 940
 941         if (level != SOL_IPV6)
 942                 return -ENOPROTOOPT;
 943
 944         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 945                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 946                         ipv6_setsockopt);
 947
 948         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 949 #ifdef CONFIG_NETFILTER
 950         /* we need to exclude all possible ENOPROTOOPTs except default case */
 951         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 952             optname != IPV6_XFRM_POLICY) {
 953                 lock_sock(sk);
 954                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 955                                            optval, optlen);
 956                 release_sock(sk);
 957         }
 958 #endif
 959         return err;
 960 }
 961 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 962 #endif
 963
 964 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 965                                   int optname, char __user *optval, int len)
 966 {
 967         struct ipv6_opt_hdr *hdr;
 968
 969         if (!opt)
 970                 return 0;
 971
 972         switch (optname) {
 973         case IPV6_HOPOPTS:
 974                 hdr = opt->hopopt;
 975                 break;
 976         case IPV6_RTHDRDSTOPTS:
 977                 hdr = opt->dst0opt;
 978                 break;
 979         case IPV6_RTHDR:
 980                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 981                 break;
 982         case IPV6_DSTOPTS:
 983                 hdr = opt->dst1opt;
 984                 break;
 985         default:
 986                 return -EINVAL; /* should not happen */
 987         }
 988
 989         if (!hdr)
 990                 return 0;
 991
 992         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 993         if (copy_to_user(optval, hdr, len))
 994                 return -EFAULT;
 995         return len;
 996 }
 997
 998 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 999                     char __user *optval, int __user *optlen, unsigned int flags)
1000 {
1001         struct ipv6_pinfo *np = inet6_sk(sk);
1002         int len;
1003         int val;
1004
1005         if (ip6_mroute_opt(optname))
1006                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1007
1008         if (get_user(len, optlen))
1009                 return -EFAULT;
1010         switch (optname) {
1011         case IPV6_ADDRFORM:
1012                 if (sk->sk_protocol != IPPROTO_UDP &&
1013                     sk->sk_protocol != IPPROTO_UDPLITE &&
1014                     sk->sk_protocol != IPPROTO_TCP)
1015                         return -ENOPROTOOPT;
1016                 if (sk->sk_state != TCP_ESTABLISHED)
1017                         return -ENOTCONN;
1018                 val = sk->sk_family;
1019                 break;
1020         case MCAST_MSFILTER:
1021         {
1022                 struct group_filter gsf;
1023                 int err;
1024
1025                 if (len < GROUP_FILTER_SIZE(0))
1026                         return -EINVAL;
1027                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1028                         return -EFAULT;
1029                 if (gsf.gf_group.ss_family != AF_INET6)
1030                         return -EADDRNOTAVAIL;
1031                 lock_sock(sk);
1032                 err = ip6_mc_msfget(sk, &gsf,
1033                         (struct group_filter __user *)optval, optlen);
1034                 release_sock(sk);
1035                 return err;
1036         }
1037
1038         case IPV6_2292PKTOPTIONS:
1039         {
1040                 struct msghdr msg;
1041                 struct sk_buff *skb;
1042
1043                 if (sk->sk_type != SOCK_STREAM)
1044                         return -ENOPROTOOPT;
1045
1046                 msg.msg_control = optval;
1047                 msg.msg_controllen = len;
1048                 msg.msg_flags = flags;
1049
1050                 lock_sock(sk);
1051                 skb = np->pktoptions;
1052                 if (skb)
1053                         ip6_datagram_recv_ctl(sk, &msg, skb);
1054                 release_sock(sk);
1055                 if (!skb) {
1056                         if (np->rxopt.bits.rxinfo) {
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 : np->sticky_pktinfo.ipi6_addr;
1061                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1062                         }
1063                         if (np->rxopt.bits.rxhlim) {
1064                                 int hlim = np->mcast_hops;
1065                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1066                         }
1067                         if (np->rxopt.bits.rxtclass) {
1068                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1069
1070                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1071                         }
1072                         if (np->rxopt.bits.rxoinfo) {
1073                                 struct in6_pktinfo src_info;
1074                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1075                                         np->sticky_pktinfo.ipi6_ifindex;
1076                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1077                                                                      np->sticky_pktinfo.ipi6_addr;
1078                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1079                         }
1080                         if (np->rxopt.bits.rxohlim) {
1081                                 int hlim = np->mcast_hops;
1082                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1083                         }
1084                         if (np->rxopt.bits.rxflow) {
1085                                 __be32 flowinfo = np->rcv_flowinfo;
1086
1087                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1088                         }
1089                 }
1090                 len -= msg.msg_controllen;
1091                 return put_user(len, optlen);
1092         }
1093         case IPV6_MTU:
1094         {
1095                 struct dst_entry *dst;
1096
1097                 val = 0;
1098                 rcu_read_lock();
1099                 dst = __sk_dst_get(sk);
1100                 if (dst)
1101                         val = dst_mtu(dst);
1102                 rcu_read_unlock();
1103                 if (!val)
1104                         return -ENOTCONN;
1105                 break;
1106         }
1107
1108         case IPV6_V6ONLY:
1109                 val = sk->sk_ipv6only;
1110                 break;
1111
1112         case IPV6_RECVPKTINFO:
1113                 val = np->rxopt.bits.rxinfo;
1114                 break;
1115
1116         case IPV6_2292PKTINFO:
1117                 val = np->rxopt.bits.rxoinfo;
1118                 break;
1119
1120         case IPV6_RECVHOPLIMIT:
1121                 val = np->rxopt.bits.rxhlim;
1122                 break;
1123
1124         case IPV6_2292HOPLIMIT:
1125                 val = np->rxopt.bits.rxohlim;
1126                 break;
1127
1128         case IPV6_RECVRTHDR:
1129                 val = np->rxopt.bits.srcrt;
1130                 break;
1131
1132         case IPV6_2292RTHDR:
1133                 val = np->rxopt.bits.osrcrt;
1134                 break;
1135
1136         case IPV6_HOPOPTS:
1137         case IPV6_RTHDRDSTOPTS:
1138         case IPV6_RTHDR:
1139         case IPV6_DSTOPTS:
1140         {
1141                 struct ipv6_txoptions *opt;
1142
1143                 lock_sock(sk);
1144                 opt = rcu_dereference_protected(np->opt,
1145                                                 lockdep_sock_is_held(sk));
1146                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1147                 release_sock(sk);
1148                 /* check if ipv6_getsockopt_sticky() returns err code */
1149                 if (len < 0)
1150                         return len;
1151                 return put_user(len, optlen);
1152         }
1153
1154         case IPV6_RECVHOPOPTS:
1155                 val = np->rxopt.bits.hopopts;
1156                 break;
1157
1158         case IPV6_2292HOPOPTS:
1159                 val = np->rxopt.bits.ohopopts;
1160                 break;
1161
1162         case IPV6_RECVDSTOPTS:
1163                 val = np->rxopt.bits.dstopts;
1164                 break;
1165
1166         case IPV6_2292DSTOPTS:
1167                 val = np->rxopt.bits.odstopts;
1168                 break;
1169
1170         case IPV6_TCLASS:
1171                 val = np->tclass;
1172                 break;
1173
1174         case IPV6_RECVTCLASS:
1175                 val = np->rxopt.bits.rxtclass;
1176                 break;
1177
1178         case IPV6_FLOWINFO:
1179                 val = np->rxopt.bits.rxflow;
1180                 break;
1181
1182         case IPV6_RECVPATHMTU:
1183                 val = np->rxopt.bits.rxpmtu;
1184                 break;
1185
1186         case IPV6_PATHMTU:
1187         {
1188                 struct dst_entry *dst;
1189                 struct ip6_mtuinfo mtuinfo;
1190
1191                 if (len < sizeof(mtuinfo))
1192                         return -EINVAL;
1193
1194                 len = sizeof(mtuinfo);
1195                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1196
1197                 rcu_read_lock();
1198                 dst = __sk_dst_get(sk);
1199                 if (dst)
1200                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1201                 rcu_read_unlock();
1202                 if (!mtuinfo.ip6m_mtu)
1203                         return -ENOTCONN;
1204
1205                 if (put_user(len, optlen))
1206                         return -EFAULT;
1207                 if (copy_to_user(optval, &mtuinfo, len))
1208                         return -EFAULT;
1209
1210                 return 0;
1211         }
1212
1213         case IPV6_TRANSPARENT:
1214                 val = inet_sk(sk)->transparent;
1215                 break;
1216
1217         case IPV6_RECVORIGDSTADDR:
1218                 val = np->rxopt.bits.rxorigdstaddr;
1219                 break;
1220
1221         case IPV6_UNICAST_HOPS:
1222         case IPV6_MULTICAST_HOPS:
1223         {
1224                 struct dst_entry *dst;
1225
1226                 if (optname == IPV6_UNICAST_HOPS)
1227                         val = np->hop_limit;
1228                 else
1229                         val = np->mcast_hops;
1230
1231                 if (val < 0) {
1232                         rcu_read_lock();
1233                         dst = __sk_dst_get(sk);
1234                         if (dst)
1235                                 val = ip6_dst_hoplimit(dst);
1236                         rcu_read_unlock();
1237                 }
1238
1239                 if (val < 0)
1240                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1241                 break;
1242         }
1243
1244         case IPV6_MULTICAST_LOOP:
1245                 val = np->mc_loop;
1246                 break;
1247
1248         case IPV6_MULTICAST_IF:
1249                 val = np->mcast_oif;
1250                 break;
1251
1252         case IPV6_UNICAST_IF:
1253                 val = (__force int)htonl((__u32) np->ucast_oif);
1254                 break;
1255
1256         case IPV6_MTU_DISCOVER:
1257                 val = np->pmtudisc;
1258                 break;
1259
1260         case IPV6_RECVERR:
1261                 val = np->recverr;
1262                 break;
1263
1264         case IPV6_FLOWINFO_SEND:
1265                 val = np->sndflow;
1266                 break;
1267
1268         case IPV6_FLOWLABEL_MGR:
1269         {
1270                 struct in6_flowlabel_req freq;
1271                 int flags;
1272
1273                 if (len < sizeof(freq))
1274                         return -EINVAL;
1275
1276                 if (copy_from_user(&freq, optval, sizeof(freq)))
1277                         return -EFAULT;
1278
1279                 if (freq.flr_action != IPV6_FL_A_GET)
1280                         return -EINVAL;
1281
1282                 len = sizeof(freq);
1283                 flags = freq.flr_flags;
1284
1285                 memset(&freq, 0, sizeof(freq));
1286
1287                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1288                 if (val < 0)
1289                         return val;
1290
1291                 if (put_user(len, optlen))
1292                         return -EFAULT;
1293                 if (copy_to_user(optval, &freq, len))
1294                         return -EFAULT;
1295
1296                 return 0;
1297         }
1298
1299         case IPV6_ADDR_PREFERENCES:
1300                 val = 0;
1301
1302                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1303                         val |= IPV6_PREFER_SRC_TMP;
1304                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1305                         val |= IPV6_PREFER_SRC_PUBLIC;
1306                 else {
1307                         /* XXX: should we return system default? */
1308                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1309                 }
1310
1311                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1312                         val |= IPV6_PREFER_SRC_COA;
1313                 else
1314                         val |= IPV6_PREFER_SRC_HOME;
1315                 break;
1316
1317         case IPV6_MINHOPCOUNT:
1318                 val = np->min_hopcount;
1319                 break;
1320
1321         case IPV6_DONTFRAG:
1322                 val = np->dontfrag;
1323                 break;
1324
1325         case IPV6_AUTOFLOWLABEL:
1326                 val = np->autoflowlabel;
1327                 break;
1328
1329         case IPV6_RECVFRAGSIZE:
1330                 val = np->rxopt.bits.recvfragsize;
1331                 break;
1332
1333         default:
1334                 return -ENOPROTOOPT;
1335         }
1336         len = min_t(unsigned int, sizeof(int), len);
1337         if (put_user(len, optlen))
1338                 return -EFAULT;
1339         if (copy_to_user(optval, &val, len))
1340                 return -EFAULT;
1341         return 0;
1342 }
1343
1344 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1345                     char __user *optval, int __user *optlen)
1346 {
1347         int err;
1348
1349         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1350                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1351
1352         if (level != SOL_IPV6)
1353                 return -ENOPROTOOPT;
1354
1355         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1356 #ifdef CONFIG_NETFILTER
1357         /* we need to exclude all possible ENOPROTOOPTs except default case */
1358         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1359                 int len;
1360
1361                 if (get_user(len, optlen))
1362                         return -EFAULT;
1363
1364                 lock_sock(sk);
1365                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1366                                 &len);
1367                 release_sock(sk);
1368                 if (err >= 0)
1369                         err = put_user(len, optlen);
1370         }
1371 #endif
1372         return err;
1373 }
1374 EXPORT_SYMBOL(ipv6_getsockopt);
1375
1376 #ifdef CONFIG_COMPAT
1377 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1378                            char __user *optval, int __user *optlen)
1379 {
1380         int err;
1381
1382         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1383                 if (udp_prot.compat_getsockopt != NULL)
1384                         return udp_prot.compat_getsockopt(sk, level, optname,
1385                                                           optval, optlen);
1386                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1387         }
1388
1389         if (level != SOL_IPV6)
1390                 return -ENOPROTOOPT;
1391
1392         if (optname == MCAST_MSFILTER)
1393                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1394                         ipv6_getsockopt);
1395
1396         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1397                                  MSG_CMSG_COMPAT);
1398 #ifdef CONFIG_NETFILTER
1399         /* we need to exclude all possible ENOPROTOOPTs except default case */
1400         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1401                 int len;
1402
1403                 if (get_user(len, optlen))
1404                         return -EFAULT;
1405
1406                 lock_sock(sk);
1407                 err = compat_nf_getsockopt(sk, PF_INET6,
1408                                            optname, optval, &len);
1409                 release_sock(sk);
1410                 if (err >= 0)
1411                         err = put_user(len, optlen);
1412         }
1413 #endif
1414         return err;
1415 }
1416 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1417 #endif
1418