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