net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  *
  15  *      FIXME: Make the setsockopt code POSIX compliant: That is
  16  *
  17  *      o       Truncate getsockopt returns
  18  *      o       Return an optlen of the truncated length if need be
  19  *
  20  *      Changes:
  21  *      David L Stevens <dlstevens@us.ibm.com>:
  22  *              - added multicast source filtering API for MLDv2
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/capability.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/socket.h>
  30 #include <linux/sockios.h>
  31 #include <linux/net.h>
  32 #include <linux/in6.h>
  33 #include <linux/mroute6.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/init.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/netfilter.h>
  39 #include <linux/slab.h>
  40
  41 #include <net/sock.h>
  42 #include <net/snmp.h>
  43 #include <net/ipv6.h>
  44 #include <net/ndisc.h>
  45 #include <net/protocol.h>
  46 #include <net/transp_v6.h>
  47 #include <net/ip6_route.h>
  48 #include <net/addrconf.h>
  49 #include <net/inet_common.h>
  50 #include <net/tcp.h>
  51 #include <net/udp.h>
  52 #include <net/udplite.h>
  53 #include <net/xfrm.h>
  54 #include <net/compat.h>
  55
  56 #include <asm/uaccess.h>
  57
  58 struct ip6_ra_chain *ip6_ra_chain;
  59 DEFINE_RWLOCK(ip6_ra_lock);
  60
  61 int ip6_ra_control(struct sock *sk, int sel)
  62 {
  63         struct ip6_ra_chain *ra, *new_ra, **rap;
  64
  65         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  66         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  67                 return -ENOPROTOOPT;
  68
  69         new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  70
  71         write_lock_bh(&ip6_ra_lock);
  72         for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
  73                 if (ra->sk == sk) {
  74                         if (sel >= 0) {
  75                                 write_unlock_bh(&ip6_ra_lock);
  76                                 kfree(new_ra);
  77                                 return -EADDRINUSE;
  78                         }
  79
  80                         *rap = ra->next;
  81                         write_unlock_bh(&ip6_ra_lock);
  82
  83                         sock_put(sk);
  84                         kfree(ra);
  85                         return 0;
  86                 }
  87         }
  88         if (!new_ra) {
  89                 write_unlock_bh(&ip6_ra_lock);
  90                 return -ENOBUFS;
  91         }
  92         new_ra->sk = sk;
  93         new_ra->sel = sel;
  94         new_ra->next = ra;
  95         *rap = new_ra;
  96         sock_hold(sk);
  97         write_unlock_bh(&ip6_ra_lock);
  98         return 0;
  99 }
 100
 101 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 102                                            struct ipv6_txoptions *opt)
 103 {
 104         if (inet_sk(sk)->is_icsk) {
 105                 if (opt &&
 106                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 107                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 108                         struct inet_connection_sock *icsk = inet_csk(sk);
 109                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 110                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 111                 }
 112         }
 113         opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
 114                    opt);
 115         sk_dst_reset(sk);
 116
 117         return opt;
 118 }
 119
 120 static bool setsockopt_needs_rtnl(int optname)
 121 {
 122         switch (optname) {
 123         case IPV6_ADD_MEMBERSHIP:
 124         case IPV6_DROP_MEMBERSHIP:
 125         case IPV6_JOIN_ANYCAST:
 126         case IPV6_LEAVE_ANYCAST:
 127         case MCAST_JOIN_GROUP:
 128         case MCAST_LEAVE_GROUP:
 129         case MCAST_JOIN_SOURCE_GROUP:
 130         case MCAST_LEAVE_SOURCE_GROUP:
 131         case MCAST_BLOCK_SOURCE:
 132         case MCAST_UNBLOCK_SOURCE:
 133         case MCAST_MSFILTER:
 134                 return true;
 135         }
 136         return false;
 137 }
 138
 139 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 140                     char __user *optval, unsigned int optlen)
 141 {
 142         struct ipv6_pinfo *np = inet6_sk(sk);
 143         struct net *net = sock_net(sk);
 144         int val, valbool;
 145         int retv = -ENOPROTOOPT;
 146         bool needs_rtnl = setsockopt_needs_rtnl(optname);
 147
 148         if (!optval)
 149                 val = 0;
 150         else {
 151                 if (optlen >= sizeof(int)) {
 152                         if (get_user(val, (int __user *) optval))
 153                                 return -EFAULT;
 154                 } else
 155                         val = 0;
 156         }
 157
 158         valbool = (val != 0);
 159
 160         if (ip6_mroute_opt(optname))
 161                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 162
 163         if (needs_rtnl)
 164                 rtnl_lock();
 165         lock_sock(sk);
 166
 167         switch (optname) {
 168
 169         case IPV6_ADDRFORM:
 170                 if (optlen < sizeof(int))
 171                         goto e_inval;
 172                 if (val == PF_INET) {
 173                         struct ipv6_txoptions *opt;
 174                         struct sk_buff *pktopt;
 175
 176                         if (sk->sk_type == SOCK_RAW)
 177                                 break;
 178
 179                         if (sk->sk_protocol == IPPROTO_UDP ||
 180                             sk->sk_protocol == IPPROTO_UDPLITE) {
 181                                 struct udp_sock *up = udp_sk(sk);
 182                                 if (up->pending == AF_INET6) {
 183                                         retv = -EBUSY;
 184                                         break;
 185                                 }
 186                         } else if (sk->sk_protocol != IPPROTO_TCP)
 187                                 break;
 188
 189                         if (sk->sk_state != TCP_ESTABLISHED) {
 190                                 retv = -ENOTCONN;
 191                                 break;
 192                         }
 193
 194                         if (ipv6_only_sock(sk) ||
 195                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 196                                 retv = -EADDRNOTAVAIL;
 197                                 break;
 198                         }
 199
 200                         fl6_free_socklist(sk);
 201                         ipv6_sock_mc_close(sk);
 202
 203                         /*
 204                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 205                          * remove it from the refcnt debug socks count in the
 206                          * original family...
 207                          */
 208                         sk_refcnt_debug_dec(sk);
 209
 210                         if (sk->sk_protocol == IPPROTO_TCP) {
 211                                 struct inet_connection_sock *icsk = inet_csk(sk);
 212                                 local_bh_disable();
 213                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 214                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 215                                 local_bh_enable();
 216                                 sk->sk_prot = &tcp_prot;
 217                                 icsk->icsk_af_ops = &ipv4_specific;
 218                                 sk->sk_socket->ops = &inet_stream_ops;
 219                                 sk->sk_family = PF_INET;
 220                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 221                         } else {
 222                                 struct proto *prot = &udp_prot;
 223
 224                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 225                                         prot = &udplite_prot;
 226                                 local_bh_disable();
 227                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 228                                 sock_prot_inuse_add(net, prot, 1);
 229                                 local_bh_enable();
 230                                 sk->sk_prot = prot;
 231                                 sk->sk_socket->ops = &inet_dgram_ops;
 232                                 sk->sk_family = PF_INET;
 233                         }
 234                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
 235                                    NULL);
 236                         if (opt) {
 237                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 238                                 txopt_put(opt);
 239                         }
 240                         pktopt = xchg(&np->pktoptions, NULL);
 241                         kfree_skb(pktopt);
 242
 243                         sk->sk_destruct = inet_sock_destruct;
 244                         /*
 245                          * ... and add it to the refcnt debug socks count
 246                          * in the new family. -acme
 247                          */
 248                         sk_refcnt_debug_inc(sk);
 249                         module_put(THIS_MODULE);
 250                         retv = 0;
 251                         break;
 252                 }
 253                 goto e_inval;
 254
 255         case IPV6_V6ONLY:
 256                 if (optlen < sizeof(int) ||
 257                     inet_sk(sk)->inet_num)
 258                         goto e_inval;
 259                 sk->sk_ipv6only = valbool;
 260                 retv = 0;
 261                 break;
 262
 263         case IPV6_RECVPKTINFO:
 264                 if (optlen < sizeof(int))
 265                         goto e_inval;
 266                 np->rxopt.bits.rxinfo = valbool;
 267                 retv = 0;
 268                 break;
 269
 270         case IPV6_2292PKTINFO:
 271                 if (optlen < sizeof(int))
 272                         goto e_inval;
 273                 np->rxopt.bits.rxoinfo = valbool;
 274                 retv = 0;
 275                 break;
 276
 277         case IPV6_RECVHOPLIMIT:
 278                 if (optlen < sizeof(int))
 279                         goto e_inval;
 280                 np->rxopt.bits.rxhlim = valbool;
 281                 retv = 0;
 282                 break;
 283
 284         case IPV6_2292HOPLIMIT:
 285                 if (optlen < sizeof(int))
 286                         goto e_inval;
 287                 np->rxopt.bits.rxohlim = valbool;
 288                 retv = 0;
 289                 break;
 290
 291         case IPV6_RECVRTHDR:
 292                 if (optlen < sizeof(int))
 293                         goto e_inval;
 294                 np->rxopt.bits.srcrt = valbool;
 295                 retv = 0;
 296                 break;
 297
 298         case IPV6_2292RTHDR:
 299                 if (optlen < sizeof(int))
 300                         goto e_inval;
 301                 np->rxopt.bits.osrcrt = valbool;
 302                 retv = 0;
 303                 break;
 304
 305         case IPV6_RECVHOPOPTS:
 306                 if (optlen < sizeof(int))
 307                         goto e_inval;
 308                 np->rxopt.bits.hopopts = valbool;
 309                 retv = 0;
 310                 break;
 311
 312         case IPV6_2292HOPOPTS:
 313                 if (optlen < sizeof(int))
 314                         goto e_inval;
 315                 np->rxopt.bits.ohopopts = valbool;
 316                 retv = 0;
 317                 break;
 318
 319         case IPV6_RECVDSTOPTS:
 320                 if (optlen < sizeof(int))
 321                         goto e_inval;
 322                 np->rxopt.bits.dstopts = valbool;
 323                 retv = 0;
 324                 break;
 325
 326         case IPV6_2292DSTOPTS:
 327                 if (optlen < sizeof(int))
 328                         goto e_inval;
 329                 np->rxopt.bits.odstopts = valbool;
 330                 retv = 0;
 331                 break;
 332
 333         case IPV6_TCLASS:
 334                 if (optlen < sizeof(int))
 335                         goto e_inval;
 336                 if (val < -1 || val > 0xff)
 337                         goto e_inval;
 338                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 339                 if (val == -1)
 340                         val = 0;
 341                 np->tclass = val;
 342                 retv = 0;
 343                 break;
 344
 345         case IPV6_RECVTCLASS:
 346                 if (optlen < sizeof(int))
 347                         goto e_inval;
 348                 np->rxopt.bits.rxtclass = valbool;
 349                 retv = 0;
 350                 break;
 351
 352         case IPV6_FLOWINFO:
 353                 if (optlen < sizeof(int))
 354                         goto e_inval;
 355                 np->rxopt.bits.rxflow = valbool;
 356                 retv = 0;
 357                 break;
 358
 359         case IPV6_RECVPATHMTU:
 360                 if (optlen < sizeof(int))
 361                         goto e_inval;
 362                 np->rxopt.bits.rxpmtu = valbool;
 363                 retv = 0;
 364                 break;
 365
 366         case IPV6_TRANSPARENT:
 367                 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 368                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 369                         retv = -EPERM;
 370                         break;
 371                 }
 372                 if (optlen < sizeof(int))
 373                         goto e_inval;
 374                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 375                 inet_sk(sk)->transparent = valbool;
 376                 retv = 0;
 377                 break;
 378
 379         case IPV6_RECVORIGDSTADDR:
 380                 if (optlen < sizeof(int))
 381                         goto e_inval;
 382                 np->rxopt.bits.rxorigdstaddr = valbool;
 383                 retv = 0;
 384                 break;
 385
 386         case IPV6_HOPOPTS:
 387         case IPV6_RTHDRDSTOPTS:
 388         case IPV6_RTHDR:
 389         case IPV6_DSTOPTS:
 390         {
 391                 struct ipv6_txoptions *opt;
 392
 393                 /* remove any sticky options header with a zero option
 394                  * length, per RFC3542.
 395                  */
 396                 if (optlen == 0)
 397                         optval = NULL;
 398                 else if (!optval)
 399                         goto e_inval;
 400                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 401                          optlen & 0x7 || optlen > 8 * 255)
 402                         goto e_inval;
 403
 404                 /* hop-by-hop / destination options are privileged option */
 405                 retv = -EPERM;
 406                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 407                         break;
 408
 409                 opt = rcu_dereference_protected(np->opt,
 410                                                 lockdep_sock_is_held(sk));
 411                 opt = ipv6_renew_options(sk, opt, optname,
 412                                          (struct ipv6_opt_hdr __user *)optval,
 413                                          optlen);
 414                 if (IS_ERR(opt)) {
 415                         retv = PTR_ERR(opt);
 416                         break;
 417                 }
 418
 419                 /* routing header option needs extra check */
 420                 retv = -EINVAL;
 421                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 422                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 423                         switch (rthdr->type) {
 424 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 425                         case IPV6_SRCRT_TYPE_2:
 426                                 if (rthdr->hdrlen != 2 ||
 427                                     rthdr->segments_left != 1)
 428                                         goto sticky_done;
 429
 430                                 break;
 431 #endif
 432                         default:
 433                                 goto sticky_done;
 434                         }
 435                 }
 436
 437                 retv = 0;
 438                 opt = ipv6_update_options(sk, opt);
 439 sticky_done:
 440                 if (opt) {
 441                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 442                         txopt_put(opt);
 443                 }
 444                 break;
 445         }
 446
 447         case IPV6_PKTINFO:
 448         {
 449                 struct in6_pktinfo pkt;
 450
 451                 if (optlen == 0)
 452                         goto e_inval;
 453                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 454                         goto e_inval;
 455
 456                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 457                                 retv = -EFAULT;
 458                                 break;
 459                 }
 460                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 461                         goto e_inval;
 462
 463                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 464                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 465                 retv = 0;
 466                 break;
 467         }
 468
 469         case IPV6_2292PKTOPTIONS:
 470         {
 471                 struct ipv6_txoptions *opt = NULL;
 472                 struct msghdr msg;
 473                 struct flowi6 fl6;
 474                 struct sockcm_cookie sockc_junk;
 475                 struct ipcm6_cookie ipc6;
 476
 477                 memset(&fl6, 0, sizeof(fl6));
 478                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 479                 fl6.flowi6_mark = sk->sk_mark;
 480
 481                 if (optlen == 0)
 482                         goto update;
 483
 484                 /* 1K is probably excessive
 485                  * 1K is surely not enough, 2K per standard header is 16K.
 486                  */
 487                 retv = -EINVAL;
 488                 if (optlen > 64*1024)
 489                         break;
 490
 491                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 492                 retv = -ENOBUFS;
 493                 if (!opt)
 494                         break;
 495
 496                 memset(opt, 0, sizeof(*opt));
 497                 atomic_set(&opt->refcnt, 1);
 498                 opt->tot_len = sizeof(*opt) + optlen;
 499                 retv = -EFAULT;
 500                 if (copy_from_user(opt+1, optval, optlen))
 501                         goto done;
 502
 503                 msg.msg_controllen = optlen;
 504                 msg.msg_control = (void *)(opt+1);
 505                 ipc6.opt = opt;
 506
 507                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
 508                 if (retv)
 509                         goto done;
 510 update:
 511                 retv = 0;
 512                 opt = ipv6_update_options(sk, opt);
 513 done:
 514                 if (opt) {
 515                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 516                         txopt_put(opt);
 517                 }
 518                 break;
 519         }
 520         case IPV6_UNICAST_HOPS:
 521                 if (optlen < sizeof(int))
 522                         goto e_inval;
 523                 if (val > 255 || val < -1)
 524                         goto e_inval;
 525                 np->hop_limit = val;
 526                 retv = 0;
 527                 break;
 528
 529         case IPV6_MULTICAST_HOPS:
 530                 if (sk->sk_type == SOCK_STREAM)
 531                         break;
 532                 if (optlen < sizeof(int))
 533                         goto e_inval;
 534                 if (val > 255 || val < -1)
 535                         goto e_inval;
 536                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 537                 retv = 0;
 538                 break;
 539
 540         case IPV6_MULTICAST_LOOP:
 541                 if (optlen < sizeof(int))
 542                         goto e_inval;
 543                 if (val != valbool)
 544                         goto e_inval;
 545                 np->mc_loop = valbool;
 546                 retv = 0;
 547                 break;
 548
 549         case IPV6_UNICAST_IF:
 550         {
 551                 struct net_device *dev = NULL;
 552                 int ifindex;
 553
 554                 if (optlen != sizeof(int))
 555                         goto e_inval;
 556
 557                 ifindex = (__force int)ntohl((__force __be32)val);
 558                 if (ifindex == 0) {
 559                         np->ucast_oif = 0;
 560                         retv = 0;
 561                         break;
 562                 }
 563
 564                 dev = dev_get_by_index(net, ifindex);
 565                 retv = -EADDRNOTAVAIL;
 566                 if (!dev)
 567                         break;
 568                 dev_put(dev);
 569
 570                 retv = -EINVAL;
 571                 if (sk->sk_bound_dev_if)
 572                         break;
 573
 574                 np->ucast_oif = ifindex;
 575                 retv = 0;
 576                 break;
 577         }
 578
 579         case IPV6_MULTICAST_IF:
 580                 if (sk->sk_type == SOCK_STREAM)
 581                         break;
 582                 if (optlen < sizeof(int))
 583                         goto e_inval;
 584
 585                 if (val) {
 586                         struct net_device *dev;
 587
 588                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 589                                 goto e_inval;
 590
 591                         dev = dev_get_by_index(net, val);
 592                         if (!dev) {
 593                                 retv = -ENODEV;
 594                                 break;
 595                         }
 596                         dev_put(dev);
 597                 }
 598                 np->mcast_oif = val;
 599                 retv = 0;
 600                 break;
 601         case IPV6_ADD_MEMBERSHIP:
 602         case IPV6_DROP_MEMBERSHIP:
 603         {
 604                 struct ipv6_mreq mreq;
 605
 606                 if (optlen < sizeof(struct ipv6_mreq))
 607                         goto e_inval;
 608
 609                 retv = -EPROTO;
 610                 if (inet_sk(sk)->is_icsk)
 611                         break;
 612
 613                 retv = -EFAULT;
 614                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 615                         break;
 616
 617                 if (optname == IPV6_ADD_MEMBERSHIP)
 618                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 619                 else
 620                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 621                 break;
 622         }
 623         case IPV6_JOIN_ANYCAST:
 624         case IPV6_LEAVE_ANYCAST:
 625         {
 626                 struct ipv6_mreq mreq;
 627
 628                 if (optlen < sizeof(struct ipv6_mreq))
 629                         goto e_inval;
 630
 631                 retv = -EFAULT;
 632                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 633                         break;
 634
 635                 if (optname == IPV6_JOIN_ANYCAST)
 636                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 637                 else
 638                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 639                 break;
 640         }
 641         case MCAST_JOIN_GROUP:
 642         case MCAST_LEAVE_GROUP:
 643         {
 644                 struct group_req greq;
 645                 struct sockaddr_in6 *psin6;
 646
 647                 if (optlen < sizeof(struct group_req))
 648                         goto e_inval;
 649
 650                 retv = -EFAULT;
 651                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 652                         break;
 653                 if (greq.gr_group.ss_family != AF_INET6) {
 654                         retv = -EADDRNOTAVAIL;
 655                         break;
 656                 }
 657                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 658                 if (optname == MCAST_JOIN_GROUP)
 659                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 660                                                  &psin6->sin6_addr);
 661                 else
 662                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 663                                                  &psin6->sin6_addr);
 664                 break;
 665         }
 666         case MCAST_JOIN_SOURCE_GROUP:
 667         case MCAST_LEAVE_SOURCE_GROUP:
 668         case MCAST_BLOCK_SOURCE:
 669         case MCAST_UNBLOCK_SOURCE:
 670         {
 671                 struct group_source_req greqs;
 672                 int omode, add;
 673
 674                 if (optlen < sizeof(struct group_source_req))
 675                         goto e_inval;
 676                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 677                         retv = -EFAULT;
 678                         break;
 679                 }
 680                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 681                     greqs.gsr_source.ss_family != AF_INET6) {
 682                         retv = -EADDRNOTAVAIL;
 683                         break;
 684                 }
 685                 if (optname == MCAST_BLOCK_SOURCE) {
 686                         omode = MCAST_EXCLUDE;
 687                         add = 1;
 688                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 689                         omode = MCAST_EXCLUDE;
 690                         add = 0;
 691                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 692                         struct sockaddr_in6 *psin6;
 693
 694                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 695                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 696                                                  &psin6->sin6_addr);
 697                         /* prior join w/ different source is ok */
 698                         if (retv && retv != -EADDRINUSE)
 699                                 break;
 700                         omode = MCAST_INCLUDE;
 701                         add = 1;
 702                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 703                         omode = MCAST_INCLUDE;
 704                         add = 0;
 705                 }
 706                 retv = ip6_mc_source(add, omode, sk, &greqs);
 707                 break;
 708         }
 709         case MCAST_MSFILTER:
 710         {
 711                 struct group_filter *gsf;
 712
 713                 if (optlen < GROUP_FILTER_SIZE(0))
 714                         goto e_inval;
 715                 if (optlen > sysctl_optmem_max) {
 716                         retv = -ENOBUFS;
 717                         break;
 718                 }
 719                 gsf = kmalloc(optlen, GFP_KERNEL);
 720                 if (!gsf) {
 721                         retv = -ENOBUFS;
 722                         break;
 723                 }
 724                 retv = -EFAULT;
 725                 if (copy_from_user(gsf, optval, optlen)) {
 726                         kfree(gsf);
 727                         break;
 728                 }
 729                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 730                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 731                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 732                         kfree(gsf);
 733                         retv = -ENOBUFS;
 734                         break;
 735                 }
 736                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 737                         kfree(gsf);
 738                         retv = -EINVAL;
 739                         break;
 740                 }
 741                 retv = ip6_mc_msfilter(sk, gsf);
 742                 kfree(gsf);
 743
 744                 break;
 745         }
 746         case IPV6_ROUTER_ALERT:
 747                 if (optlen < sizeof(int))
 748                         goto e_inval;
 749                 retv = ip6_ra_control(sk, val);
 750                 break;
 751         case IPV6_MTU_DISCOVER:
 752                 if (optlen < sizeof(int))
 753                         goto e_inval;
 754                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 755                         goto e_inval;
 756                 np->pmtudisc = val;
 757                 retv = 0;
 758                 break;
 759         case IPV6_MTU:
 760                 if (optlen < sizeof(int))
 761                         goto e_inval;
 762                 if (val && val < IPV6_MIN_MTU)
 763                         goto e_inval;
 764                 np->frag_size = val;
 765                 retv = 0;
 766                 break;
 767         case IPV6_RECVERR:
 768                 if (optlen < sizeof(int))
 769                         goto e_inval;
 770                 np->recverr = valbool;
 771                 if (!val)
 772                         skb_queue_purge(&sk->sk_error_queue);
 773                 retv = 0;
 774                 break;
 775         case IPV6_FLOWINFO_SEND:
 776                 if (optlen < sizeof(int))
 777                         goto e_inval;
 778                 np->sndflow = valbool;
 779                 retv = 0;
 780                 break;
 781         case IPV6_FLOWLABEL_MGR:
 782                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 783                 break;
 784         case IPV6_IPSEC_POLICY:
 785         case IPV6_XFRM_POLICY:
 786                 retv = -EPERM;
 787                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 788                         break;
 789                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 790                 break;
 791
 792         case IPV6_ADDR_PREFERENCES:
 793             {
 794                 unsigned int pref = 0;
 795                 unsigned int prefmask = ~0;
 796
 797                 if (optlen < sizeof(int))
 798                         goto e_inval;
 799
 800                 retv = -EINVAL;
 801
 802                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 803                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 804                                IPV6_PREFER_SRC_TMP|
 805                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 806                 case IPV6_PREFER_SRC_PUBLIC:
 807                         pref |= IPV6_PREFER_SRC_PUBLIC;
 808                         break;
 809                 case IPV6_PREFER_SRC_TMP:
 810                         pref |= IPV6_PREFER_SRC_TMP;
 811                         break;
 812                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 813                         break;
 814                 case 0:
 815                         goto pref_skip_pubtmp;
 816                 default:
 817                         goto e_inval;
 818                 }
 819
 820                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 821                               IPV6_PREFER_SRC_TMP);
 822 pref_skip_pubtmp:
 823
 824                 /* check HOME/COA conflicts */
 825                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 826                 case IPV6_PREFER_SRC_HOME:
 827                         break;
 828                 case IPV6_PREFER_SRC_COA:
 829                         pref |= IPV6_PREFER_SRC_COA;
 830                 case 0:
 831                         goto pref_skip_coa;
 832                 default:
 833                         goto e_inval;
 834                 }
 835
 836                 prefmask &= ~IPV6_PREFER_SRC_COA;
 837 pref_skip_coa:
 838
 839                 /* check CGA/NONCGA conflicts */
 840                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 841                 case IPV6_PREFER_SRC_CGA:
 842                 case IPV6_PREFER_SRC_NONCGA:
 843                 case 0:
 844                         break;
 845                 default:
 846                         goto e_inval;
 847                 }
 848
 849                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 850                 retv = 0;
 851
 852                 break;
 853             }
 854         case IPV6_MINHOPCOUNT:
 855                 if (optlen < sizeof(int))
 856                         goto e_inval;
 857                 if (val < 0 || val > 255)
 858                         goto e_inval;
 859                 np->min_hopcount = val;
 860                 retv = 0;
 861                 break;
 862         case IPV6_DONTFRAG:
 863                 np->dontfrag = valbool;
 864                 retv = 0;
 865                 break;
 866         case IPV6_AUTOFLOWLABEL:
 867                 np->autoflowlabel = valbool;
 868                 retv = 0;
 869                 break;
 870         }
 871
 872         release_sock(sk);
 873         if (needs_rtnl)
 874                 rtnl_unlock();
 875
 876         return retv;
 877
 878 e_inval:
 879         release_sock(sk);
 880         if (needs_rtnl)
 881                 rtnl_unlock();
 882         return -EINVAL;
 883 }
 884
 885 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 886                     char __user *optval, unsigned int optlen)
 887 {
 888         int err;
 889
 890         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 891                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 892
 893         if (level != SOL_IPV6)
 894                 return -ENOPROTOOPT;
 895
 896         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 897 #ifdef CONFIG_NETFILTER
 898         /* we need to exclude all possible ENOPROTOOPTs except default case */
 899         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 900                         optname != IPV6_XFRM_POLICY) {
 901                 lock_sock(sk);
 902                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 903                                 optlen);
 904                 release_sock(sk);
 905         }
 906 #endif
 907         return err;
 908 }
 909 EXPORT_SYMBOL(ipv6_setsockopt);
 910
 911 #ifdef CONFIG_COMPAT
 912 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 913                            char __user *optval, unsigned int optlen)
 914 {
 915         int err;
 916
 917         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 918                 if (udp_prot.compat_setsockopt != NULL)
 919                         return udp_prot.compat_setsockopt(sk, level, optname,
 920                                                           optval, optlen);
 921                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 922         }
 923
 924         if (level != SOL_IPV6)
 925                 return -ENOPROTOOPT;
 926
 927         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 928                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 929                         ipv6_setsockopt);
 930
 931         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 932 #ifdef CONFIG_NETFILTER
 933         /* we need to exclude all possible ENOPROTOOPTs except default case */
 934         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 935             optname != IPV6_XFRM_POLICY) {
 936                 lock_sock(sk);
 937                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 938                                            optval, optlen);
 939                 release_sock(sk);
 940         }
 941 #endif
 942         return err;
 943 }
 944 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 945 #endif
 946
 947 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 948                                   int optname, char __user *optval, int len)
 949 {
 950         struct ipv6_opt_hdr *hdr;
 951
 952         if (!opt)
 953                 return 0;
 954
 955         switch (optname) {
 956         case IPV6_HOPOPTS:
 957                 hdr = opt->hopopt;
 958                 break;
 959         case IPV6_RTHDRDSTOPTS:
 960                 hdr = opt->dst0opt;
 961                 break;
 962         case IPV6_RTHDR:
 963                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 964                 break;
 965         case IPV6_DSTOPTS:
 966                 hdr = opt->dst1opt;
 967                 break;
 968         default:
 969                 return -EINVAL; /* should not happen */
 970         }
 971
 972         if (!hdr)
 973                 return 0;
 974
 975         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 976         if (copy_to_user(optval, hdr, len))
 977                 return -EFAULT;
 978         return len;
 979 }
 980
 981 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 982                     char __user *optval, int __user *optlen, unsigned int flags)
 983 {
 984         struct ipv6_pinfo *np = inet6_sk(sk);
 985         int len;
 986         int val;
 987
 988         if (ip6_mroute_opt(optname))
 989                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 990
 991         if (get_user(len, optlen))
 992                 return -EFAULT;
 993         switch (optname) {
 994         case IPV6_ADDRFORM:
 995                 if (sk->sk_protocol != IPPROTO_UDP &&
 996                     sk->sk_protocol != IPPROTO_UDPLITE &&
 997                     sk->sk_protocol != IPPROTO_TCP)
 998                         return -ENOPROTOOPT;
 999                 if (sk->sk_state != TCP_ESTABLISHED)
1000                         return -ENOTCONN;
1001                 val = sk->sk_family;
1002                 break;
1003         case MCAST_MSFILTER:
1004         {
1005                 struct group_filter gsf;
1006                 int err;
1007
1008                 if (len < GROUP_FILTER_SIZE(0))
1009                         return -EINVAL;
1010                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1011                         return -EFAULT;
1012                 if (gsf.gf_group.ss_family != AF_INET6)
1013                         return -EADDRNOTAVAIL;
1014                 lock_sock(sk);
1015                 err = ip6_mc_msfget(sk, &gsf,
1016                         (struct group_filter __user *)optval, optlen);
1017                 release_sock(sk);
1018                 return err;
1019         }
1020
1021         case IPV6_2292PKTOPTIONS:
1022         {
1023                 struct msghdr msg;
1024                 struct sk_buff *skb;
1025
1026                 if (sk->sk_type != SOCK_STREAM)
1027                         return -ENOPROTOOPT;
1028
1029                 msg.msg_control = optval;
1030                 msg.msg_controllen = len;
1031                 msg.msg_flags = flags;
1032
1033                 lock_sock(sk);
1034                 skb = np->pktoptions;
1035                 if (skb)
1036                         ip6_datagram_recv_ctl(sk, &msg, skb);
1037                 release_sock(sk);
1038                 if (!skb) {
1039                         if (np->rxopt.bits.rxinfo) {
1040                                 struct in6_pktinfo src_info;
1041                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1042                                         np->sticky_pktinfo.ipi6_ifindex;
1043                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1044                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1045                         }
1046                         if (np->rxopt.bits.rxhlim) {
1047                                 int hlim = np->mcast_hops;
1048                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1049                         }
1050                         if (np->rxopt.bits.rxtclass) {
1051                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1052
1053                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1054                         }
1055                         if (np->rxopt.bits.rxoinfo) {
1056                                 struct in6_pktinfo src_info;
1057                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1058                                         np->sticky_pktinfo.ipi6_ifindex;
1059                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1060                                                                      np->sticky_pktinfo.ipi6_addr;
1061                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1062                         }
1063                         if (np->rxopt.bits.rxohlim) {
1064                                 int hlim = np->mcast_hops;
1065                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1066                         }
1067                         if (np->rxopt.bits.rxflow) {
1068                                 __be32 flowinfo = np->rcv_flowinfo;
1069
1070                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1071                         }
1072                 }
1073                 len -= msg.msg_controllen;
1074                 return put_user(len, optlen);
1075         }
1076         case IPV6_MTU:
1077         {
1078                 struct dst_entry *dst;
1079
1080                 val = 0;
1081                 rcu_read_lock();
1082                 dst = __sk_dst_get(sk);
1083                 if (dst)
1084                         val = dst_mtu(dst);
1085                 rcu_read_unlock();
1086                 if (!val)
1087                         return -ENOTCONN;
1088                 break;
1089         }
1090
1091         case IPV6_V6ONLY:
1092                 val = sk->sk_ipv6only;
1093                 break;
1094
1095         case IPV6_RECVPKTINFO:
1096                 val = np->rxopt.bits.rxinfo;
1097                 break;
1098
1099         case IPV6_2292PKTINFO:
1100                 val = np->rxopt.bits.rxoinfo;
1101                 break;
1102
1103         case IPV6_RECVHOPLIMIT:
1104                 val = np->rxopt.bits.rxhlim;
1105                 break;
1106
1107         case IPV6_2292HOPLIMIT:
1108                 val = np->rxopt.bits.rxohlim;
1109                 break;
1110
1111         case IPV6_RECVRTHDR:
1112                 val = np->rxopt.bits.srcrt;
1113                 break;
1114
1115         case IPV6_2292RTHDR:
1116                 val = np->rxopt.bits.osrcrt;
1117                 break;
1118
1119         case IPV6_HOPOPTS:
1120         case IPV6_RTHDRDSTOPTS:
1121         case IPV6_RTHDR:
1122         case IPV6_DSTOPTS:
1123         {
1124                 struct ipv6_txoptions *opt;
1125
1126                 lock_sock(sk);
1127                 opt = rcu_dereference_protected(np->opt,
1128                                                 lockdep_sock_is_held(sk));
1129                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1130                 release_sock(sk);
1131                 /* check if ipv6_getsockopt_sticky() returns err code */
1132                 if (len < 0)
1133                         return len;
1134                 return put_user(len, optlen);
1135         }
1136
1137         case IPV6_RECVHOPOPTS:
1138                 val = np->rxopt.bits.hopopts;
1139                 break;
1140
1141         case IPV6_2292HOPOPTS:
1142                 val = np->rxopt.bits.ohopopts;
1143                 break;
1144
1145         case IPV6_RECVDSTOPTS:
1146                 val = np->rxopt.bits.dstopts;
1147                 break;
1148
1149         case IPV6_2292DSTOPTS:
1150                 val = np->rxopt.bits.odstopts;
1151                 break;
1152
1153         case IPV6_TCLASS:
1154                 val = np->tclass;
1155                 break;
1156
1157         case IPV6_RECVTCLASS:
1158                 val = np->rxopt.bits.rxtclass;
1159                 break;
1160
1161         case IPV6_FLOWINFO:
1162                 val = np->rxopt.bits.rxflow;
1163                 break;
1164
1165         case IPV6_RECVPATHMTU:
1166                 val = np->rxopt.bits.rxpmtu;
1167                 break;
1168
1169         case IPV6_PATHMTU:
1170         {
1171                 struct dst_entry *dst;
1172                 struct ip6_mtuinfo mtuinfo;
1173
1174                 if (len < sizeof(mtuinfo))
1175                         return -EINVAL;
1176
1177                 len = sizeof(mtuinfo);
1178                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1179
1180                 rcu_read_lock();
1181                 dst = __sk_dst_get(sk);
1182                 if (dst)
1183                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1184                 rcu_read_unlock();
1185                 if (!mtuinfo.ip6m_mtu)
1186                         return -ENOTCONN;
1187
1188                 if (put_user(len, optlen))
1189                         return -EFAULT;
1190                 if (copy_to_user(optval, &mtuinfo, len))
1191                         return -EFAULT;
1192
1193                 return 0;
1194         }
1195
1196         case IPV6_TRANSPARENT:
1197                 val = inet_sk(sk)->transparent;
1198                 break;
1199
1200         case IPV6_RECVORIGDSTADDR:
1201                 val = np->rxopt.bits.rxorigdstaddr;
1202                 break;
1203
1204         case IPV6_UNICAST_HOPS:
1205         case IPV6_MULTICAST_HOPS:
1206         {
1207                 struct dst_entry *dst;
1208
1209                 if (optname == IPV6_UNICAST_HOPS)
1210                         val = np->hop_limit;
1211                 else
1212                         val = np->mcast_hops;
1213
1214                 if (val < 0) {
1215                         rcu_read_lock();
1216                         dst = __sk_dst_get(sk);
1217                         if (dst)
1218                                 val = ip6_dst_hoplimit(dst);
1219                         rcu_read_unlock();
1220                 }
1221
1222                 if (val < 0)
1223                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1224                 break;
1225         }
1226
1227         case IPV6_MULTICAST_LOOP:
1228                 val = np->mc_loop;
1229                 break;
1230
1231         case IPV6_MULTICAST_IF:
1232                 val = np->mcast_oif;
1233                 break;
1234
1235         case IPV6_UNICAST_IF:
1236                 val = (__force int)htonl((__u32) np->ucast_oif);
1237                 break;
1238
1239         case IPV6_MTU_DISCOVER:
1240                 val = np->pmtudisc;
1241                 break;
1242
1243         case IPV6_RECVERR:
1244                 val = np->recverr;
1245                 break;
1246
1247         case IPV6_FLOWINFO_SEND:
1248                 val = np->sndflow;
1249                 break;
1250
1251         case IPV6_FLOWLABEL_MGR:
1252         {
1253                 struct in6_flowlabel_req freq;
1254                 int flags;
1255
1256                 if (len < sizeof(freq))
1257                         return -EINVAL;
1258
1259                 if (copy_from_user(&freq, optval, sizeof(freq)))
1260                         return -EFAULT;
1261
1262                 if (freq.flr_action != IPV6_FL_A_GET)
1263                         return -EINVAL;
1264
1265                 len = sizeof(freq);
1266                 flags = freq.flr_flags;
1267
1268                 memset(&freq, 0, sizeof(freq));
1269
1270                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1271                 if (val < 0)
1272                         return val;
1273
1274                 if (put_user(len, optlen))
1275                         return -EFAULT;
1276                 if (copy_to_user(optval, &freq, len))
1277                         return -EFAULT;
1278
1279                 return 0;
1280         }
1281
1282         case IPV6_ADDR_PREFERENCES:
1283                 val = 0;
1284
1285                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1286                         val |= IPV6_PREFER_SRC_TMP;
1287                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1288                         val |= IPV6_PREFER_SRC_PUBLIC;
1289                 else {
1290                         /* XXX: should we return system default? */
1291                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1292                 }
1293
1294                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1295                         val |= IPV6_PREFER_SRC_COA;
1296                 else
1297                         val |= IPV6_PREFER_SRC_HOME;
1298                 break;
1299
1300         case IPV6_MINHOPCOUNT:
1301                 val = np->min_hopcount;
1302                 break;
1303
1304         case IPV6_DONTFRAG:
1305                 val = np->dontfrag;
1306                 break;
1307
1308         case IPV6_AUTOFLOWLABEL:
1309                 val = np->autoflowlabel;
1310                 break;
1311
1312         default:
1313                 return -ENOPROTOOPT;
1314         }
1315         len = min_t(unsigned int, sizeof(int), len);
1316         if (put_user(len, optlen))
1317                 return -EFAULT;
1318         if (copy_to_user(optval, &val, len))
1319                 return -EFAULT;
1320         return 0;
1321 }
1322
1323 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1324                     char __user *optval, int __user *optlen)
1325 {
1326         int err;
1327
1328         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1329                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1330
1331         if (level != SOL_IPV6)
1332                 return -ENOPROTOOPT;
1333
1334         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1335 #ifdef CONFIG_NETFILTER
1336         /* we need to exclude all possible ENOPROTOOPTs except default case */
1337         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1338                 int len;
1339
1340                 if (get_user(len, optlen))
1341                         return -EFAULT;
1342
1343                 lock_sock(sk);
1344                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1345                                 &len);
1346                 release_sock(sk);
1347                 if (err >= 0)
1348                         err = put_user(len, optlen);
1349         }
1350 #endif
1351         return err;
1352 }
1353 EXPORT_SYMBOL(ipv6_getsockopt);
1354
1355 #ifdef CONFIG_COMPAT
1356 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1357                            char __user *optval, int __user *optlen)
1358 {
1359         int err;
1360
1361         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1362                 if (udp_prot.compat_getsockopt != NULL)
1363                         return udp_prot.compat_getsockopt(sk, level, optname,
1364                                                           optval, optlen);
1365                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1366         }
1367
1368         if (level != SOL_IPV6)
1369                 return -ENOPROTOOPT;
1370
1371         if (optname == MCAST_MSFILTER)
1372                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1373                         ipv6_getsockopt);
1374
1375         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1376                                  MSG_CMSG_COMPAT);
1377 #ifdef CONFIG_NETFILTER
1378         /* we need to exclude all possible ENOPROTOOPTs except default case */
1379         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1380                 int len;
1381
1382                 if (get_user(len, optlen))
1383                         return -EFAULT;
1384
1385                 lock_sock(sk);
1386                 err = compat_nf_getsockopt(sk, PF_INET6,
1387                                            optname, optval, &len);
1388                 release_sock(sk);
1389                 if (err >= 0)
1390                         err = put_user(len, optlen);
1391         }
1392 #endif
1393         return err;
1394 }
1395 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1396 #endif
1397