net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  *
  15  *      FIXME: Make the setsockopt code POSIX compliant: That is
  16  *
  17  *      o       Truncate getsockopt returns
  18  *      o       Return an optlen of the truncated length if need be
  19  *
  20  *      Changes:
  21  *      David L Stevens <dlstevens@us.ibm.com>:
  22  *              - added multicast source filtering API for MLDv2
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/capability.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/socket.h>
  30 #include <linux/sockios.h>
  31 #include <linux/net.h>
  32 #include <linux/in6.h>
  33 #include <linux/mroute6.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/init.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/netfilter.h>
  39 #include <linux/slab.h>
  40
  41 #include <net/sock.h>
  42 #include <net/snmp.h>
  43 #include <net/ipv6.h>
  44 #include <net/ndisc.h>
  45 #include <net/protocol.h>
  46 #include <net/transp_v6.h>
  47 #include <net/ip6_route.h>
  48 #include <net/addrconf.h>
  49 #include <net/inet_common.h>
  50 #include <net/tcp.h>
  51 #include <net/udp.h>
  52 #include <net/udplite.h>
  53 #include <net/xfrm.h>
  54 #include <net/compat.h>
  55 #include <net/seg6.h>
  56
  57 #include <linux/uaccess.h>
  58
  59 struct ip6_ra_chain *ip6_ra_chain;
  60 DEFINE_RWLOCK(ip6_ra_lock);
  61
  62 int ip6_ra_control(struct sock *sk, int sel)
  63 {
  64         struct ip6_ra_chain *ra, *new_ra, **rap;
  65
  66         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  67         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  68                 return -ENOPROTOOPT;
  69
  70         new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  71
  72         write_lock_bh(&ip6_ra_lock);
  73         for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
  74                 if (ra->sk == sk) {
  75                         if (sel >= 0) {
  76                                 write_unlock_bh(&ip6_ra_lock);
  77                                 kfree(new_ra);
  78                                 return -EADDRINUSE;
  79                         }
  80
  81                         *rap = ra->next;
  82                         write_unlock_bh(&ip6_ra_lock);
  83
  84                         sock_put(sk);
  85                         kfree(ra);
  86                         return 0;
  87                 }
  88         }
  89         if (!new_ra) {
  90                 write_unlock_bh(&ip6_ra_lock);
  91                 return -ENOBUFS;
  92         }
  93         new_ra->sk = sk;
  94         new_ra->sel = sel;
  95         new_ra->next = ra;
  96         *rap = new_ra;
  97         sock_hold(sk);
  98         write_unlock_bh(&ip6_ra_lock);
  99         return 0;
 100 }
 101
 102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 103                                            struct ipv6_txoptions *opt)
 104 {
 105         if (inet_sk(sk)->is_icsk) {
 106                 if (opt &&
 107                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 108                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 109                         struct inet_connection_sock *icsk = inet_csk(sk);
 110                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 111                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 112                 }
 113         }
 114         opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
 115                    opt);
 116         sk_dst_reset(sk);
 117
 118         return opt;
 119 }
 120
 121 static bool setsockopt_needs_rtnl(int optname)
 122 {
 123         switch (optname) {
 124         case IPV6_ADDRFORM:
 125         case IPV6_ADD_MEMBERSHIP:
 126         case IPV6_DROP_MEMBERSHIP:
 127         case IPV6_JOIN_ANYCAST:
 128         case IPV6_LEAVE_ANYCAST:
 129         case MCAST_JOIN_GROUP:
 130         case MCAST_LEAVE_GROUP:
 131         case MCAST_JOIN_SOURCE_GROUP:
 132         case MCAST_LEAVE_SOURCE_GROUP:
 133         case MCAST_BLOCK_SOURCE:
 134         case MCAST_UNBLOCK_SOURCE:
 135         case MCAST_MSFILTER:
 136                 return true;
 137         }
 138         return false;
 139 }
 140
 141 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 142                     char __user *optval, unsigned int optlen)
 143 {
 144         struct ipv6_pinfo *np = inet6_sk(sk);
 145         struct net *net = sock_net(sk);
 146         int val, valbool;
 147         int retv = -ENOPROTOOPT;
 148         bool needs_rtnl = setsockopt_needs_rtnl(optname);
 149
 150         if (!optval)
 151                 val = 0;
 152         else {
 153                 if (optlen >= sizeof(int)) {
 154                         if (get_user(val, (int __user *) optval))
 155                                 return -EFAULT;
 156                 } else
 157                         val = 0;
 158         }
 159
 160         valbool = (val != 0);
 161
 162         if (ip6_mroute_opt(optname))
 163                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 164
 165         if (needs_rtnl)
 166                 rtnl_lock();
 167         lock_sock(sk);
 168
 169         /* Another thread has converted the socket into IPv4 with
 170          * IPV6_ADDRFORM concurrently.
 171          */
 172         if (unlikely(sk->sk_family != AF_INET6))
 173                 goto unlock;
 174
 175         switch (optname) {
 176
 177         case IPV6_ADDRFORM:
 178                 if (optlen < sizeof(int))
 179                         goto e_inval;
 180                 if (val == PF_INET) {
 181                         if (sk->sk_type == SOCK_RAW)
 182                                 break;
 183
 184                         if (sk->sk_protocol == IPPROTO_UDP ||
 185                             sk->sk_protocol == IPPROTO_UDPLITE) {
 186                                 struct udp_sock *up = udp_sk(sk);
 187                                 if (up->pending == AF_INET6) {
 188                                         retv = -EBUSY;
 189                                         break;
 190                                 }
 191                         } else if (sk->sk_protocol == IPPROTO_TCP) {
 192                                 if (sk->sk_prot != &tcpv6_prot) {
 193                                         retv = -EBUSY;
 194                                         break;
 195                                 }
 196                         } else {
 197                                 break;
 198                         }
 199
 200                         if (sk->sk_state != TCP_ESTABLISHED) {
 201                                 retv = -ENOTCONN;
 202                                 break;
 203                         }
 204
 205                         if (ipv6_only_sock(sk) ||
 206                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 207                                 retv = -EADDRNOTAVAIL;
 208                                 break;
 209                         }
 210
 211                         __ipv6_sock_mc_close(sk);
 212                         __ipv6_sock_ac_close(sk);
 213
 214                         /*
 215                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 216                          * remove it from the refcnt debug socks count in the
 217                          * original family...
 218                          */
 219                         sk_refcnt_debug_dec(sk);
 220
 221                         if (sk->sk_protocol == IPPROTO_TCP) {
 222                                 struct inet_connection_sock *icsk = inet_csk(sk);
 223                                 local_bh_disable();
 224                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 225                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 226                                 local_bh_enable();
 227                                 sk->sk_prot = &tcp_prot;
 228                                 icsk->icsk_af_ops = &ipv4_specific;
 229                                 sk->sk_socket->ops = &inet_stream_ops;
 230                                 sk->sk_family = PF_INET;
 231                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 232                         } else {
 233                                 struct proto *prot = &udp_prot;
 234
 235                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 236                                         prot = &udplite_prot;
 237                                 local_bh_disable();
 238                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 239                                 sock_prot_inuse_add(net, prot, 1);
 240                                 local_bh_enable();
 241                                 sk->sk_prot = prot;
 242                                 sk->sk_socket->ops = &inet_dgram_ops;
 243                                 sk->sk_family = PF_INET;
 244                         }
 245
 246                         /* Disable all options not to allocate memory anymore,
 247                          * but there is still a race.  See the lockless path
 248                          * in udpv6_sendmsg() and ipv6_local_rxpmtu().
 249                          */
 250                         np->rxopt.all = 0;
 251
 252                         inet6_cleanup_sock(sk);
 253
 254                         /*
 255                          * ... and add it to the refcnt debug socks count
 256                          * in the new family. -acme
 257                          */
 258                         sk_refcnt_debug_inc(sk);
 259                         module_put(THIS_MODULE);
 260                         retv = 0;
 261                         break;
 262                 }
 263                 goto e_inval;
 264
 265         case IPV6_V6ONLY:
 266                 if (optlen < sizeof(int) ||
 267                     inet_sk(sk)->inet_num)
 268                         goto e_inval;
 269                 sk->sk_ipv6only = valbool;
 270                 retv = 0;
 271                 break;
 272
 273         case IPV6_RECVPKTINFO:
 274                 if (optlen < sizeof(int))
 275                         goto e_inval;
 276                 np->rxopt.bits.rxinfo = valbool;
 277                 retv = 0;
 278                 break;
 279
 280         case IPV6_2292PKTINFO:
 281                 if (optlen < sizeof(int))
 282                         goto e_inval;
 283                 np->rxopt.bits.rxoinfo = valbool;
 284                 retv = 0;
 285                 break;
 286
 287         case IPV6_RECVHOPLIMIT:
 288                 if (optlen < sizeof(int))
 289                         goto e_inval;
 290                 np->rxopt.bits.rxhlim = valbool;
 291                 retv = 0;
 292                 break;
 293
 294         case IPV6_2292HOPLIMIT:
 295                 if (optlen < sizeof(int))
 296                         goto e_inval;
 297                 np->rxopt.bits.rxohlim = valbool;
 298                 retv = 0;
 299                 break;
 300
 301         case IPV6_RECVRTHDR:
 302                 if (optlen < sizeof(int))
 303                         goto e_inval;
 304                 np->rxopt.bits.srcrt = valbool;
 305                 retv = 0;
 306                 break;
 307
 308         case IPV6_2292RTHDR:
 309                 if (optlen < sizeof(int))
 310                         goto e_inval;
 311                 np->rxopt.bits.osrcrt = valbool;
 312                 retv = 0;
 313                 break;
 314
 315         case IPV6_RECVHOPOPTS:
 316                 if (optlen < sizeof(int))
 317                         goto e_inval;
 318                 np->rxopt.bits.hopopts = valbool;
 319                 retv = 0;
 320                 break;
 321
 322         case IPV6_2292HOPOPTS:
 323                 if (optlen < sizeof(int))
 324                         goto e_inval;
 325                 np->rxopt.bits.ohopopts = valbool;
 326                 retv = 0;
 327                 break;
 328
 329         case IPV6_RECVDSTOPTS:
 330                 if (optlen < sizeof(int))
 331                         goto e_inval;
 332                 np->rxopt.bits.dstopts = valbool;
 333                 retv = 0;
 334                 break;
 335
 336         case IPV6_2292DSTOPTS:
 337                 if (optlen < sizeof(int))
 338                         goto e_inval;
 339                 np->rxopt.bits.odstopts = valbool;
 340                 retv = 0;
 341                 break;
 342
 343         case IPV6_TCLASS:
 344                 if (optlen < sizeof(int))
 345                         goto e_inval;
 346                 if (val < -1 || val > 0xff)
 347                         goto e_inval;
 348                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 349                 if (val == -1)
 350                         val = 0;
 351                 np->tclass = val;
 352                 retv = 0;
 353                 break;
 354
 355         case IPV6_RECVTCLASS:
 356                 if (optlen < sizeof(int))
 357                         goto e_inval;
 358                 np->rxopt.bits.rxtclass = valbool;
 359                 retv = 0;
 360                 break;
 361
 362         case IPV6_FLOWINFO:
 363                 if (optlen < sizeof(int))
 364                         goto e_inval;
 365                 np->rxopt.bits.rxflow = valbool;
 366                 retv = 0;
 367                 break;
 368
 369         case IPV6_RECVPATHMTU:
 370                 if (optlen < sizeof(int))
 371                         goto e_inval;
 372                 np->rxopt.bits.rxpmtu = valbool;
 373                 retv = 0;
 374                 break;
 375
 376         case IPV6_TRANSPARENT:
 377                 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 378                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 379                         retv = -EPERM;
 380                         break;
 381                 }
 382                 if (optlen < sizeof(int))
 383                         goto e_inval;
 384                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 385                 inet_sk(sk)->transparent = valbool;
 386                 retv = 0;
 387                 break;
 388
 389         case IPV6_FREEBIND:
 390                 if (optlen < sizeof(int))
 391                         goto e_inval;
 392                 /* we also don't have a separate freebind bit for IPV6 */
 393                 inet_sk(sk)->freebind = valbool;
 394                 retv = 0;
 395                 break;
 396
 397         case IPV6_RECVORIGDSTADDR:
 398                 if (optlen < sizeof(int))
 399                         goto e_inval;
 400                 np->rxopt.bits.rxorigdstaddr = valbool;
 401                 retv = 0;
 402                 break;
 403
 404         case IPV6_HOPOPTS:
 405         case IPV6_RTHDRDSTOPTS:
 406         case IPV6_RTHDR:
 407         case IPV6_DSTOPTS:
 408         {
 409                 struct ipv6_txoptions *opt;
 410                 struct ipv6_opt_hdr *new = NULL;
 411
 412                 /* hop-by-hop / destination options are privileged option */
 413                 retv = -EPERM;
 414                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 415                         break;
 416
 417                 /* remove any sticky options header with a zero option
 418                  * length, per RFC3542.
 419                  */
 420                 if (optlen == 0)
 421                         optval = NULL;
 422                 else if (!optval)
 423                         goto e_inval;
 424                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 425                          optlen & 0x7 || optlen > 8 * 255)
 426                         goto e_inval;
 427                 else {
 428                         new = memdup_user(optval, optlen);
 429                         if (IS_ERR(new)) {
 430                                 retv = PTR_ERR(new);
 431                                 break;
 432                         }
 433                         if (unlikely(ipv6_optlen(new) > optlen)) {
 434                                 kfree(new);
 435                                 goto e_inval;
 436                         }
 437                 }
 438
 439                 opt = rcu_dereference_protected(np->opt,
 440                                                 lockdep_sock_is_held(sk));
 441                 opt = ipv6_renew_options(sk, opt, optname, new);
 442                 kfree(new);
 443                 if (IS_ERR(opt)) {
 444                         retv = PTR_ERR(opt);
 445                         break;
 446                 }
 447
 448                 /* routing header option needs extra check */
 449                 retv = -EINVAL;
 450                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 451                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 452                         switch (rthdr->type) {
 453 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 454                         case IPV6_SRCRT_TYPE_2:
 455                                 if (rthdr->hdrlen != 2 ||
 456                                     rthdr->segments_left != 1)
 457                                         goto sticky_done;
 458
 459                                 break;
 460 #endif
 461                         case IPV6_SRCRT_TYPE_4:
 462                         {
 463                                 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
 464                                                           opt->srcrt;
 465
 466                                 if (!seg6_validate_srh(srh, optlen))
 467                                         goto sticky_done;
 468                                 break;
 469                         }
 470                         default:
 471                                 goto sticky_done;
 472                         }
 473                 }
 474
 475                 retv = 0;
 476                 opt = ipv6_update_options(sk, opt);
 477 sticky_done:
 478                 if (opt) {
 479                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 480                         txopt_put(opt);
 481                 }
 482                 break;
 483         }
 484
 485         case IPV6_PKTINFO:
 486         {
 487                 struct in6_pktinfo pkt;
 488
 489                 if (optlen == 0)
 490                         goto e_inval;
 491                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 492                         goto e_inval;
 493
 494                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 495                                 retv = -EFAULT;
 496                                 break;
 497                 }
 498                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 499                         goto e_inval;
 500
 501                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 502                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 503                 retv = 0;
 504                 break;
 505         }
 506
 507         case IPV6_2292PKTOPTIONS:
 508         {
 509                 struct ipv6_txoptions *opt = NULL;
 510                 struct msghdr msg;
 511                 struct flowi6 fl6;
 512                 struct ipcm6_cookie ipc6;
 513
 514                 memset(&fl6, 0, sizeof(fl6));
 515                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 516                 fl6.flowi6_mark = sk->sk_mark;
 517
 518                 if (optlen == 0)
 519                         goto update;
 520
 521                 /* 1K is probably excessive
 522                  * 1K is surely not enough, 2K per standard header is 16K.
 523                  */
 524                 retv = -EINVAL;
 525                 if (optlen > 64*1024)
 526                         break;
 527
 528                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 529                 retv = -ENOBUFS;
 530                 if (!opt)
 531                         break;
 532
 533                 memset(opt, 0, sizeof(*opt));
 534                 refcount_set(&opt->refcnt, 1);
 535                 opt->tot_len = sizeof(*opt) + optlen;
 536                 retv = -EFAULT;
 537                 if (copy_from_user(opt+1, optval, optlen))
 538                         goto done;
 539
 540                 msg.msg_controllen = optlen;
 541                 msg.msg_control = (void *)(opt+1);
 542                 ipc6.opt = opt;
 543
 544                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
 545                 if (retv)
 546                         goto done;
 547 update:
 548                 retv = 0;
 549                 opt = ipv6_update_options(sk, opt);
 550 done:
 551                 if (opt) {
 552                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 553                         txopt_put(opt);
 554                 }
 555                 break;
 556         }
 557         case IPV6_UNICAST_HOPS:
 558                 if (optlen < sizeof(int))
 559                         goto e_inval;
 560                 if (val > 255 || val < -1)
 561                         goto e_inval;
 562                 np->hop_limit = val;
 563                 retv = 0;
 564                 break;
 565
 566         case IPV6_MULTICAST_HOPS:
 567                 if (sk->sk_type == SOCK_STREAM)
 568                         break;
 569                 if (optlen < sizeof(int))
 570                         goto e_inval;
 571                 if (val > 255 || val < -1)
 572                         goto e_inval;
 573                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 574                 retv = 0;
 575                 break;
 576
 577         case IPV6_MULTICAST_LOOP:
 578                 if (optlen < sizeof(int))
 579                         goto e_inval;
 580                 if (val != valbool)
 581                         goto e_inval;
 582                 np->mc_loop = valbool;
 583                 retv = 0;
 584                 break;
 585
 586         case IPV6_UNICAST_IF:
 587         {
 588                 struct net_device *dev = NULL;
 589                 int ifindex;
 590
 591                 if (optlen != sizeof(int))
 592                         goto e_inval;
 593
 594                 ifindex = (__force int)ntohl((__force __be32)val);
 595                 if (ifindex == 0) {
 596                         np->ucast_oif = 0;
 597                         retv = 0;
 598                         break;
 599                 }
 600
 601                 dev = dev_get_by_index(net, ifindex);
 602                 retv = -EADDRNOTAVAIL;
 603                 if (!dev)
 604                         break;
 605                 dev_put(dev);
 606
 607                 retv = -EINVAL;
 608                 if (sk->sk_bound_dev_if)
 609                         break;
 610
 611                 np->ucast_oif = ifindex;
 612                 retv = 0;
 613                 break;
 614         }
 615
 616         case IPV6_MULTICAST_IF:
 617                 if (sk->sk_type == SOCK_STREAM)
 618                         break;
 619                 if (optlen < sizeof(int))
 620                         goto e_inval;
 621
 622                 if (val) {
 623                         struct net_device *dev;
 624                         int midx;
 625
 626                         rcu_read_lock();
 627
 628                         dev = dev_get_by_index_rcu(net, val);
 629                         if (!dev) {
 630                                 rcu_read_unlock();
 631                                 retv = -ENODEV;
 632                                 break;
 633                         }
 634                         midx = l3mdev_master_ifindex_rcu(dev);
 635
 636                         rcu_read_unlock();
 637
 638                         if (sk->sk_bound_dev_if &&
 639                             sk->sk_bound_dev_if != val &&
 640                             (!midx || midx != sk->sk_bound_dev_if))
 641                                 goto e_inval;
 642                 }
 643                 np->mcast_oif = val;
 644                 retv = 0;
 645                 break;
 646         case IPV6_ADD_MEMBERSHIP:
 647         case IPV6_DROP_MEMBERSHIP:
 648         {
 649                 struct ipv6_mreq mreq;
 650
 651                 if (optlen < sizeof(struct ipv6_mreq))
 652                         goto e_inval;
 653
 654                 retv = -EPROTO;
 655                 if (inet_sk(sk)->is_icsk)
 656                         break;
 657
 658                 retv = -EFAULT;
 659                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 660                         break;
 661
 662                 if (optname == IPV6_ADD_MEMBERSHIP)
 663                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 664                 else
 665                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 666                 break;
 667         }
 668         case IPV6_JOIN_ANYCAST:
 669         case IPV6_LEAVE_ANYCAST:
 670         {
 671                 struct ipv6_mreq mreq;
 672
 673                 if (optlen < sizeof(struct ipv6_mreq))
 674                         goto e_inval;
 675
 676                 retv = -EFAULT;
 677                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 678                         break;
 679
 680                 if (optname == IPV6_JOIN_ANYCAST)
 681                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 682                 else
 683                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 684                 break;
 685         }
 686         case MCAST_JOIN_GROUP:
 687         case MCAST_LEAVE_GROUP:
 688         {
 689                 struct group_req greq;
 690                 struct sockaddr_in6 *psin6;
 691
 692                 if (optlen < sizeof(struct group_req))
 693                         goto e_inval;
 694
 695                 retv = -EFAULT;
 696                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 697                         break;
 698                 if (greq.gr_group.ss_family != AF_INET6) {
 699                         retv = -EADDRNOTAVAIL;
 700                         break;
 701                 }
 702                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 703                 if (optname == MCAST_JOIN_GROUP)
 704                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 705                                                  &psin6->sin6_addr);
 706                 else
 707                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 708                                                  &psin6->sin6_addr);
 709                 break;
 710         }
 711         case MCAST_JOIN_SOURCE_GROUP:
 712         case MCAST_LEAVE_SOURCE_GROUP:
 713         case MCAST_BLOCK_SOURCE:
 714         case MCAST_UNBLOCK_SOURCE:
 715         {
 716                 struct group_source_req greqs;
 717                 int omode, add;
 718
 719                 if (optlen < sizeof(struct group_source_req))
 720                         goto e_inval;
 721                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 722                         retv = -EFAULT;
 723                         break;
 724                 }
 725                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 726                     greqs.gsr_source.ss_family != AF_INET6) {
 727                         retv = -EADDRNOTAVAIL;
 728                         break;
 729                 }
 730                 if (optname == MCAST_BLOCK_SOURCE) {
 731                         omode = MCAST_EXCLUDE;
 732                         add = 1;
 733                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 734                         omode = MCAST_EXCLUDE;
 735                         add = 0;
 736                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 737                         struct sockaddr_in6 *psin6;
 738
 739                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 740                         retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
 741                                                      &psin6->sin6_addr,
 742                                                      MCAST_INCLUDE);
 743                         /* prior join w/ different source is ok */
 744                         if (retv && retv != -EADDRINUSE)
 745                                 break;
 746                         omode = MCAST_INCLUDE;
 747                         add = 1;
 748                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 749                         omode = MCAST_INCLUDE;
 750                         add = 0;
 751                 }
 752                 retv = ip6_mc_source(add, omode, sk, &greqs);
 753                 break;
 754         }
 755         case MCAST_MSFILTER:
 756         {
 757                 struct group_filter *gsf;
 758
 759                 if (optlen < GROUP_FILTER_SIZE(0))
 760                         goto e_inval;
 761                 if (optlen > sysctl_optmem_max) {
 762                         retv = -ENOBUFS;
 763                         break;
 764                 }
 765                 gsf = memdup_user(optval, optlen);
 766                 if (IS_ERR(gsf)) {
 767                         retv = PTR_ERR(gsf);
 768                         break;
 769                 }
 770                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 771                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 772                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 773                         kfree(gsf);
 774                         retv = -ENOBUFS;
 775                         break;
 776                 }
 777                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 778                         kfree(gsf);
 779                         retv = -EINVAL;
 780                         break;
 781                 }
 782                 retv = ip6_mc_msfilter(sk, gsf);
 783                 kfree(gsf);
 784
 785                 break;
 786         }
 787         case IPV6_ROUTER_ALERT:
 788                 if (optlen < sizeof(int))
 789                         goto e_inval;
 790                 retv = ip6_ra_control(sk, val);
 791                 break;
 792         case IPV6_MTU_DISCOVER:
 793                 if (optlen < sizeof(int))
 794                         goto e_inval;
 795                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 796                         goto e_inval;
 797                 np->pmtudisc = val;
 798                 retv = 0;
 799                 break;
 800         case IPV6_MTU:
 801                 if (optlen < sizeof(int))
 802                         goto e_inval;
 803                 if (val && val < IPV6_MIN_MTU)
 804                         goto e_inval;
 805                 np->frag_size = val;
 806                 retv = 0;
 807                 break;
 808         case IPV6_RECVERR:
 809                 if (optlen < sizeof(int))
 810                         goto e_inval;
 811                 np->recverr = valbool;
 812                 if (!val)
 813                         skb_queue_purge(&sk->sk_error_queue);
 814                 retv = 0;
 815                 break;
 816         case IPV6_FLOWINFO_SEND:
 817                 if (optlen < sizeof(int))
 818                         goto e_inval;
 819                 np->sndflow = valbool;
 820                 retv = 0;
 821                 break;
 822         case IPV6_FLOWLABEL_MGR:
 823                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 824                 break;
 825         case IPV6_IPSEC_POLICY:
 826         case IPV6_XFRM_POLICY:
 827                 retv = -EPERM;
 828                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 829                         break;
 830                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 831                 break;
 832
 833         case IPV6_ADDR_PREFERENCES:
 834             {
 835                 unsigned int pref = 0;
 836                 unsigned int prefmask = ~0;
 837
 838                 if (optlen < sizeof(int))
 839                         goto e_inval;
 840
 841                 retv = -EINVAL;
 842
 843                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 844                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 845                                IPV6_PREFER_SRC_TMP|
 846                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 847                 case IPV6_PREFER_SRC_PUBLIC:
 848                         pref |= IPV6_PREFER_SRC_PUBLIC;
 849                         break;
 850                 case IPV6_PREFER_SRC_TMP:
 851                         pref |= IPV6_PREFER_SRC_TMP;
 852                         break;
 853                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 854                         break;
 855                 case 0:
 856                         goto pref_skip_pubtmp;
 857                 default:
 858                         goto e_inval;
 859                 }
 860
 861                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 862                               IPV6_PREFER_SRC_TMP);
 863 pref_skip_pubtmp:
 864
 865                 /* check HOME/COA conflicts */
 866                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 867                 case IPV6_PREFER_SRC_HOME:
 868                         break;
 869                 case IPV6_PREFER_SRC_COA:
 870                         pref |= IPV6_PREFER_SRC_COA;
 871                 case 0:
 872                         goto pref_skip_coa;
 873                 default:
 874                         goto e_inval;
 875                 }
 876
 877                 prefmask &= ~IPV6_PREFER_SRC_COA;
 878 pref_skip_coa:
 879
 880                 /* check CGA/NONCGA conflicts */
 881                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 882                 case IPV6_PREFER_SRC_CGA:
 883                 case IPV6_PREFER_SRC_NONCGA:
 884                 case 0:
 885                         break;
 886                 default:
 887                         goto e_inval;
 888                 }
 889
 890                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 891                 retv = 0;
 892
 893                 break;
 894             }
 895         case IPV6_MINHOPCOUNT:
 896                 if (optlen < sizeof(int))
 897                         goto e_inval;
 898                 if (val < 0 || val > 255)
 899                         goto e_inval;
 900                 np->min_hopcount = val;
 901                 retv = 0;
 902                 break;
 903         case IPV6_DONTFRAG:
 904                 np->dontfrag = valbool;
 905                 retv = 0;
 906                 break;
 907         case IPV6_AUTOFLOWLABEL:
 908                 np->autoflowlabel = valbool;
 909                 np->autoflowlabel_set = 1;
 910                 retv = 0;
 911                 break;
 912         case IPV6_RECVFRAGSIZE:
 913                 np->rxopt.bits.recvfragsize = valbool;
 914                 retv = 0;
 915                 break;
 916         }
 917
 918 unlock:
 919         release_sock(sk);
 920         if (needs_rtnl)
 921                 rtnl_unlock();
 922
 923         return retv;
 924
 925 e_inval:
 926         release_sock(sk);
 927         if (needs_rtnl)
 928                 rtnl_unlock();
 929         return -EINVAL;
 930 }
 931
 932 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 933                     char __user *optval, unsigned int optlen)
 934 {
 935         int err;
 936
 937         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 938                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 939
 940         if (level != SOL_IPV6)
 941                 return -ENOPROTOOPT;
 942
 943         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 944 #ifdef CONFIG_NETFILTER
 945         /* we need to exclude all possible ENOPROTOOPTs except default case */
 946         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 947                         optname != IPV6_XFRM_POLICY)
 948                 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
 949 #endif
 950         return err;
 951 }
 952 EXPORT_SYMBOL(ipv6_setsockopt);
 953
 954 #ifdef CONFIG_COMPAT
 955 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 956                            char __user *optval, unsigned int optlen)
 957 {
 958         int err;
 959
 960         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 961                 if (udp_prot.compat_setsockopt != NULL)
 962                         return udp_prot.compat_setsockopt(sk, level, optname,
 963                                                           optval, optlen);
 964                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 965         }
 966
 967         if (level != SOL_IPV6)
 968                 return -ENOPROTOOPT;
 969
 970         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 971                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 972                         ipv6_setsockopt);
 973
 974         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 975 #ifdef CONFIG_NETFILTER
 976         /* we need to exclude all possible ENOPROTOOPTs except default case */
 977         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 978             optname != IPV6_XFRM_POLICY)
 979                 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
 980                                            optlen);
 981 #endif
 982         return err;
 983 }
 984 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 985 #endif
 986
 987 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 988                                   int optname, char __user *optval, int len)
 989 {
 990         struct ipv6_opt_hdr *hdr;
 991
 992         if (!opt)
 993                 return 0;
 994
 995         switch (optname) {
 996         case IPV6_HOPOPTS:
 997                 hdr = opt->hopopt;
 998                 break;
 999         case IPV6_RTHDRDSTOPTS:
1000                 hdr = opt->dst0opt;
1001                 break;
1002         case IPV6_RTHDR:
1003                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1004                 break;
1005         case IPV6_DSTOPTS:
1006                 hdr = opt->dst1opt;
1007                 break;
1008         default:
1009                 return -EINVAL; /* should not happen */
1010         }
1011
1012         if (!hdr)
1013                 return 0;
1014
1015         len = min_t(unsigned int, len, ipv6_optlen(hdr));
1016         if (copy_to_user(optval, hdr, len))
1017                 return -EFAULT;
1018         return len;
1019 }
1020
1021 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1022                     char __user *optval, int __user *optlen, unsigned int flags)
1023 {
1024         struct ipv6_pinfo *np = inet6_sk(sk);
1025         int len;
1026         int val;
1027
1028         if (ip6_mroute_opt(optname))
1029                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1030
1031         if (get_user(len, optlen))
1032                 return -EFAULT;
1033         switch (optname) {
1034         case IPV6_ADDRFORM:
1035                 if (sk->sk_protocol != IPPROTO_UDP &&
1036                     sk->sk_protocol != IPPROTO_UDPLITE &&
1037                     sk->sk_protocol != IPPROTO_TCP)
1038                         return -ENOPROTOOPT;
1039                 if (sk->sk_state != TCP_ESTABLISHED)
1040                         return -ENOTCONN;
1041                 val = sk->sk_family;
1042                 break;
1043         case MCAST_MSFILTER:
1044         {
1045                 struct group_filter gsf;
1046                 int err;
1047
1048                 if (len < GROUP_FILTER_SIZE(0))
1049                         return -EINVAL;
1050                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1051                         return -EFAULT;
1052                 if (gsf.gf_group.ss_family != AF_INET6)
1053                         return -EADDRNOTAVAIL;
1054                 lock_sock(sk);
1055                 err = ip6_mc_msfget(sk, &gsf,
1056                         (struct group_filter __user *)optval, optlen);
1057                 release_sock(sk);
1058                 return err;
1059         }
1060
1061         case IPV6_2292PKTOPTIONS:
1062         {
1063                 struct msghdr msg;
1064                 struct sk_buff *skb;
1065
1066                 if (sk->sk_type != SOCK_STREAM)
1067                         return -ENOPROTOOPT;
1068
1069                 msg.msg_control = optval;
1070                 msg.msg_controllen = len;
1071                 msg.msg_flags = flags;
1072
1073                 lock_sock(sk);
1074                 skb = np->pktoptions;
1075                 if (skb)
1076                         ip6_datagram_recv_ctl(sk, &msg, skb);
1077                 release_sock(sk);
1078                 if (!skb) {
1079                         if (np->rxopt.bits.rxinfo) {
1080                                 struct in6_pktinfo src_info;
1081                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1082                                         np->sticky_pktinfo.ipi6_ifindex;
1083                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1084                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1085                         }
1086                         if (np->rxopt.bits.rxhlim) {
1087                                 int hlim = np->mcast_hops;
1088                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1089                         }
1090                         if (np->rxopt.bits.rxtclass) {
1091                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1092
1093                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1094                         }
1095                         if (np->rxopt.bits.rxoinfo) {
1096                                 struct in6_pktinfo src_info;
1097                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1098                                         np->sticky_pktinfo.ipi6_ifindex;
1099                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1100                                                                      np->sticky_pktinfo.ipi6_addr;
1101                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1102                         }
1103                         if (np->rxopt.bits.rxohlim) {
1104                                 int hlim = np->mcast_hops;
1105                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1106                         }
1107                         if (np->rxopt.bits.rxflow) {
1108                                 __be32 flowinfo = np->rcv_flowinfo;
1109
1110                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1111                         }
1112                 }
1113                 len -= msg.msg_controllen;
1114                 return put_user(len, optlen);
1115         }
1116         case IPV6_MTU:
1117         {
1118                 struct dst_entry *dst;
1119
1120                 val = 0;
1121                 rcu_read_lock();
1122                 dst = __sk_dst_get(sk);
1123                 if (dst)
1124                         val = dst_mtu(dst);
1125                 rcu_read_unlock();
1126                 if (!val)
1127                         return -ENOTCONN;
1128                 break;
1129         }
1130
1131         case IPV6_V6ONLY:
1132                 val = sk->sk_ipv6only;
1133                 break;
1134
1135         case IPV6_RECVPKTINFO:
1136                 val = np->rxopt.bits.rxinfo;
1137                 break;
1138
1139         case IPV6_2292PKTINFO:
1140                 val = np->rxopt.bits.rxoinfo;
1141                 break;
1142
1143         case IPV6_RECVHOPLIMIT:
1144                 val = np->rxopt.bits.rxhlim;
1145                 break;
1146
1147         case IPV6_2292HOPLIMIT:
1148                 val = np->rxopt.bits.rxohlim;
1149                 break;
1150
1151         case IPV6_RECVRTHDR:
1152                 val = np->rxopt.bits.srcrt;
1153                 break;
1154
1155         case IPV6_2292RTHDR:
1156                 val = np->rxopt.bits.osrcrt;
1157                 break;
1158
1159         case IPV6_HOPOPTS:
1160         case IPV6_RTHDRDSTOPTS:
1161         case IPV6_RTHDR:
1162         case IPV6_DSTOPTS:
1163         {
1164                 struct ipv6_txoptions *opt;
1165
1166                 lock_sock(sk);
1167                 opt = rcu_dereference_protected(np->opt,
1168                                                 lockdep_sock_is_held(sk));
1169                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1170                 release_sock(sk);
1171                 /* check if ipv6_getsockopt_sticky() returns err code */
1172                 if (len < 0)
1173                         return len;
1174                 return put_user(len, optlen);
1175         }
1176
1177         case IPV6_RECVHOPOPTS:
1178                 val = np->rxopt.bits.hopopts;
1179                 break;
1180
1181         case IPV6_2292HOPOPTS:
1182                 val = np->rxopt.bits.ohopopts;
1183                 break;
1184
1185         case IPV6_RECVDSTOPTS:
1186                 val = np->rxopt.bits.dstopts;
1187                 break;
1188
1189         case IPV6_2292DSTOPTS:
1190                 val = np->rxopt.bits.odstopts;
1191                 break;
1192
1193         case IPV6_TCLASS:
1194                 val = np->tclass;
1195                 break;
1196
1197         case IPV6_RECVTCLASS:
1198                 val = np->rxopt.bits.rxtclass;
1199                 break;
1200
1201         case IPV6_FLOWINFO:
1202                 val = np->rxopt.bits.rxflow;
1203                 break;
1204
1205         case IPV6_RECVPATHMTU:
1206                 val = np->rxopt.bits.rxpmtu;
1207                 break;
1208
1209         case IPV6_PATHMTU:
1210         {
1211                 struct dst_entry *dst;
1212                 struct ip6_mtuinfo mtuinfo;
1213
1214                 if (len < sizeof(mtuinfo))
1215                         return -EINVAL;
1216
1217                 len = sizeof(mtuinfo);
1218                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1219
1220                 rcu_read_lock();
1221                 dst = __sk_dst_get(sk);
1222                 if (dst)
1223                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1224                 rcu_read_unlock();
1225                 if (!mtuinfo.ip6m_mtu)
1226                         return -ENOTCONN;
1227
1228                 if (put_user(len, optlen))
1229                         return -EFAULT;
1230                 if (copy_to_user(optval, &mtuinfo, len))
1231                         return -EFAULT;
1232
1233                 return 0;
1234         }
1235
1236         case IPV6_TRANSPARENT:
1237                 val = inet_sk(sk)->transparent;
1238                 break;
1239
1240         case IPV6_FREEBIND:
1241                 val = inet_sk(sk)->freebind;
1242                 break;
1243
1244         case IPV6_RECVORIGDSTADDR:
1245                 val = np->rxopt.bits.rxorigdstaddr;
1246                 break;
1247
1248         case IPV6_UNICAST_HOPS:
1249         case IPV6_MULTICAST_HOPS:
1250         {
1251                 struct dst_entry *dst;
1252
1253                 if (optname == IPV6_UNICAST_HOPS)
1254                         val = np->hop_limit;
1255                 else
1256                         val = np->mcast_hops;
1257
1258                 if (val < 0) {
1259                         rcu_read_lock();
1260                         dst = __sk_dst_get(sk);
1261                         if (dst)
1262                                 val = ip6_dst_hoplimit(dst);
1263                         rcu_read_unlock();
1264                 }
1265
1266                 if (val < 0)
1267                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1268                 break;
1269         }
1270
1271         case IPV6_MULTICAST_LOOP:
1272                 val = np->mc_loop;
1273                 break;
1274
1275         case IPV6_MULTICAST_IF:
1276                 val = np->mcast_oif;
1277                 break;
1278
1279         case IPV6_UNICAST_IF:
1280                 val = (__force int)htonl((__u32) np->ucast_oif);
1281                 break;
1282
1283         case IPV6_MTU_DISCOVER:
1284                 val = np->pmtudisc;
1285                 break;
1286
1287         case IPV6_RECVERR:
1288                 val = np->recverr;
1289                 break;
1290
1291         case IPV6_FLOWINFO_SEND:
1292                 val = np->sndflow;
1293                 break;
1294
1295         case IPV6_FLOWLABEL_MGR:
1296         {
1297                 struct in6_flowlabel_req freq;
1298                 int flags;
1299
1300                 if (len < sizeof(freq))
1301                         return -EINVAL;
1302
1303                 if (copy_from_user(&freq, optval, sizeof(freq)))
1304                         return -EFAULT;
1305
1306                 if (freq.flr_action != IPV6_FL_A_GET)
1307                         return -EINVAL;
1308
1309                 len = sizeof(freq);
1310                 flags = freq.flr_flags;
1311
1312                 memset(&freq, 0, sizeof(freq));
1313
1314                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1315                 if (val < 0)
1316                         return val;
1317
1318                 if (put_user(len, optlen))
1319                         return -EFAULT;
1320                 if (copy_to_user(optval, &freq, len))
1321                         return -EFAULT;
1322
1323                 return 0;
1324         }
1325
1326         case IPV6_ADDR_PREFERENCES:
1327                 val = 0;
1328
1329                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1330                         val |= IPV6_PREFER_SRC_TMP;
1331                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1332                         val |= IPV6_PREFER_SRC_PUBLIC;
1333                 else {
1334                         /* XXX: should we return system default? */
1335                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1336                 }
1337
1338                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1339                         val |= IPV6_PREFER_SRC_COA;
1340                 else
1341                         val |= IPV6_PREFER_SRC_HOME;
1342                 break;
1343
1344         case IPV6_MINHOPCOUNT:
1345                 val = np->min_hopcount;
1346                 break;
1347
1348         case IPV6_DONTFRAG:
1349                 val = np->dontfrag;
1350                 break;
1351
1352         case IPV6_AUTOFLOWLABEL:
1353                 val = ip6_autoflowlabel(sock_net(sk), np);
1354                 break;
1355
1356         case IPV6_RECVFRAGSIZE:
1357                 val = np->rxopt.bits.recvfragsize;
1358                 break;
1359
1360         default:
1361                 return -ENOPROTOOPT;
1362         }
1363         len = min_t(unsigned int, sizeof(int), len);
1364         if (put_user(len, optlen))
1365                 return -EFAULT;
1366         if (copy_to_user(optval, &val, len))
1367                 return -EFAULT;
1368         return 0;
1369 }
1370
1371 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1372                     char __user *optval, int __user *optlen)
1373 {
1374         int err;
1375
1376         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1377                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1378
1379         if (level != SOL_IPV6)
1380                 return -ENOPROTOOPT;
1381
1382         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1383 #ifdef CONFIG_NETFILTER
1384         /* we need to exclude all possible ENOPROTOOPTs except default case */
1385         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1386                 int len;
1387
1388                 if (get_user(len, optlen))
1389                         return -EFAULT;
1390
1391                 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1392                 if (err >= 0)
1393                         err = put_user(len, optlen);
1394         }
1395 #endif
1396         return err;
1397 }
1398 EXPORT_SYMBOL(ipv6_getsockopt);
1399
1400 #ifdef CONFIG_COMPAT
1401 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1402                            char __user *optval, int __user *optlen)
1403 {
1404         int err;
1405
1406         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1407                 if (udp_prot.compat_getsockopt != NULL)
1408                         return udp_prot.compat_getsockopt(sk, level, optname,
1409                                                           optval, optlen);
1410                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1411         }
1412
1413         if (level != SOL_IPV6)
1414                 return -ENOPROTOOPT;
1415
1416         if (optname == MCAST_MSFILTER)
1417                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1418                         ipv6_getsockopt);
1419
1420         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1421                                  MSG_CMSG_COMPAT);
1422 #ifdef CONFIG_NETFILTER
1423         /* we need to exclude all possible ENOPROTOOPTs except default case */
1424         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1425                 int len;
1426
1427                 if (get_user(len, optlen))
1428                         return -EFAULT;
1429
1430                 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1431                 if (err >= 0)
1432                         err = put_user(len, optlen);
1433         }
1434 #endif
1435         return err;
1436 }
1437 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1438 #endif