net/ipv6/ipv6_sockglue.c

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