net/ipv6/ipv6_sockglue.c

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