net/ipv6/ipv6_sockglue.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      IPv6 BSD socket options interface
   4  *      Linux INET6 implementation
   5  *
   6  *      Authors:
   7  *      Pedro Roque             <roque@di.fc.ul.pt>
   8  *
   9  *      Based on linux/net/ipv4/ip_sockglue.c
  10  *
  11  *      FIXME: Make the setsockopt code POSIX compliant: That is
  12  *
  13  *      o       Truncate getsockopt returns
  14  *      o       Return an optlen of the truncated length if need be
  15  *
  16  *      Changes:
  17  *      David L Stevens <dlstevens@us.ibm.com>:
  18  *              - added multicast source filtering API for MLDv2
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/capability.h>
  23 #include <linux/errno.h>
  24 #include <linux/types.h>
  25 #include <linux/socket.h>
  26 #include <linux/sockios.h>
  27 #include <linux/net.h>
  28 #include <linux/in6.h>
  29 #include <linux/mroute6.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/if_arp.h>
  32 #include <linux/init.h>
  33 #include <linux/sysctl.h>
  34 #include <linux/netfilter.h>
  35 #include <linux/slab.h>
  36
  37 #include <net/sock.h>
  38 #include <net/snmp.h>
  39 #include <net/ipv6.h>
  40 #include <net/ndisc.h>
  41 #include <net/protocol.h>
  42 #include <net/transp_v6.h>
  43 #include <net/ip6_route.h>
  44 #include <net/addrconf.h>
  45 #include <net/inet_common.h>
  46 #include <net/tcp.h>
  47 #include <net/udp.h>
  48 #include <net/udplite.h>
  49 #include <net/xfrm.h>
  50 #include <net/compat.h>
  51 #include <net/seg6.h>
  52
  53 #include <linux/uaccess.h>
  54
  55 struct ip6_ra_chain *ip6_ra_chain;
  56 DEFINE_RWLOCK(ip6_ra_lock);
  57
  58 int ip6_ra_control(struct sock *sk, int sel)
  59 {
  60         struct ip6_ra_chain *ra, *new_ra, **rap;
  61
  62         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  63         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  64                 return -ENOPROTOOPT;
  65
  66         new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  67         if (sel >= 0 && !new_ra)
  68                 return -ENOMEM;
  69
  70         write_lock_bh(&ip6_ra_lock);
  71         for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
  72                 if (ra->sk == sk) {
  73                         if (sel >= 0) {
  74                                 write_unlock_bh(&ip6_ra_lock);
  75                                 kfree(new_ra);
  76                                 return -EADDRINUSE;
  77                         }
  78
  79                         *rap = ra->next;
  80                         write_unlock_bh(&ip6_ra_lock);
  81
  82                         sock_put(sk);
  83                         kfree(ra);
  84                         return 0;
  85                 }
  86         }
  87         if (!new_ra) {
  88                 write_unlock_bh(&ip6_ra_lock);
  89                 return -ENOBUFS;
  90         }
  91         new_ra->sk = sk;
  92         new_ra->sel = sel;
  93         new_ra->next = ra;
  94         *rap = new_ra;
  95         sock_hold(sk);
  96         write_unlock_bh(&ip6_ra_lock);
  97         return 0;
  98 }
  99
 100 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 101                                            struct ipv6_txoptions *opt)
 102 {
 103         if (inet_sk(sk)->is_icsk) {
 104                 if (opt &&
 105                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 106                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 107                         struct inet_connection_sock *icsk = inet_csk(sk);
 108                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 109                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 110                 }
 111         }
 112         opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
 113                    opt);
 114         sk_dst_reset(sk);
 115
 116         return opt;
 117 }
 118
 119 static bool setsockopt_needs_rtnl(int optname)
 120 {
 121         switch (optname) {
 122         case IPV6_ADDRFORM:
 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                         /*
 244                          * ... and add it to the refcnt debug socks count
 245                          * in the new family. -acme
 246                          */
 247                         sk_refcnt_debug_inc(sk);
 248                         module_put(THIS_MODULE);
 249                         retv = 0;
 250                         break;
 251                 }
 252                 goto e_inval;
 253
 254         case IPV6_V6ONLY:
 255                 if (optlen < sizeof(int) ||
 256                     inet_sk(sk)->inet_num)
 257                         goto e_inval;
 258                 sk->sk_ipv6only = valbool;
 259                 retv = 0;
 260                 break;
 261
 262         case IPV6_RECVPKTINFO:
 263                 if (optlen < sizeof(int))
 264                         goto e_inval;
 265                 np->rxopt.bits.rxinfo = valbool;
 266                 retv = 0;
 267                 break;
 268
 269         case IPV6_2292PKTINFO:
 270                 if (optlen < sizeof(int))
 271                         goto e_inval;
 272                 np->rxopt.bits.rxoinfo = valbool;
 273                 retv = 0;
 274                 break;
 275
 276         case IPV6_RECVHOPLIMIT:
 277                 if (optlen < sizeof(int))
 278                         goto e_inval;
 279                 np->rxopt.bits.rxhlim = valbool;
 280                 retv = 0;
 281                 break;
 282
 283         case IPV6_2292HOPLIMIT:
 284                 if (optlen < sizeof(int))
 285                         goto e_inval;
 286                 np->rxopt.bits.rxohlim = valbool;
 287                 retv = 0;
 288                 break;
 289
 290         case IPV6_RECVRTHDR:
 291                 if (optlen < sizeof(int))
 292                         goto e_inval;
 293                 np->rxopt.bits.srcrt = valbool;
 294                 retv = 0;
 295                 break;
 296
 297         case IPV6_2292RTHDR:
 298                 if (optlen < sizeof(int))
 299                         goto e_inval;
 300                 np->rxopt.bits.osrcrt = valbool;
 301                 retv = 0;
 302                 break;
 303
 304         case IPV6_RECVHOPOPTS:
 305                 if (optlen < sizeof(int))
 306                         goto e_inval;
 307                 np->rxopt.bits.hopopts = valbool;
 308                 retv = 0;
 309                 break;
 310
 311         case IPV6_2292HOPOPTS:
 312                 if (optlen < sizeof(int))
 313                         goto e_inval;
 314                 np->rxopt.bits.ohopopts = valbool;
 315                 retv = 0;
 316                 break;
 317
 318         case IPV6_RECVDSTOPTS:
 319                 if (optlen < sizeof(int))
 320                         goto e_inval;
 321                 np->rxopt.bits.dstopts = valbool;
 322                 retv = 0;
 323                 break;
 324
 325         case IPV6_2292DSTOPTS:
 326                 if (optlen < sizeof(int))
 327                         goto e_inval;
 328                 np->rxopt.bits.odstopts = valbool;
 329                 retv = 0;
 330                 break;
 331
 332         case IPV6_TCLASS:
 333                 if (optlen < sizeof(int))
 334                         goto e_inval;
 335                 if (val < -1 || val > 0xff)
 336                         goto e_inval;
 337                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 338                 if (val == -1)
 339                         val = 0;
 340                 np->tclass = val;
 341                 retv = 0;
 342                 break;
 343
 344         case IPV6_RECVTCLASS:
 345                 if (optlen < sizeof(int))
 346                         goto e_inval;
 347                 np->rxopt.bits.rxtclass = valbool;
 348                 retv = 0;
 349                 break;
 350
 351         case IPV6_FLOWINFO:
 352                 if (optlen < sizeof(int))
 353                         goto e_inval;
 354                 np->rxopt.bits.rxflow = valbool;
 355                 retv = 0;
 356                 break;
 357
 358         case IPV6_RECVPATHMTU:
 359                 if (optlen < sizeof(int))
 360                         goto e_inval;
 361                 np->rxopt.bits.rxpmtu = valbool;
 362                 retv = 0;
 363                 break;
 364
 365         case IPV6_TRANSPARENT:
 366                 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
 367                     !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
 368                         retv = -EPERM;
 369                         break;
 370                 }
 371                 if (optlen < sizeof(int))
 372                         goto e_inval;
 373                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 374                 inet_sk(sk)->transparent = valbool;
 375                 retv = 0;
 376                 break;
 377
 378         case IPV6_FREEBIND:
 379                 if (optlen < sizeof(int))
 380                         goto e_inval;
 381                 /* we also don't have a separate freebind bit for IPV6 */
 382                 inet_sk(sk)->freebind = valbool;
 383                 retv = 0;
 384                 break;
 385
 386         case IPV6_RECVORIGDSTADDR:
 387                 if (optlen < sizeof(int))
 388                         goto e_inval;
 389                 np->rxopt.bits.rxorigdstaddr = valbool;
 390                 retv = 0;
 391                 break;
 392
 393         case IPV6_HOPOPTS:
 394         case IPV6_RTHDRDSTOPTS:
 395         case IPV6_RTHDR:
 396         case IPV6_DSTOPTS:
 397         {
 398                 struct ipv6_txoptions *opt;
 399                 struct ipv6_opt_hdr *new = NULL;
 400
 401                 /* hop-by-hop / destination options are privileged option */
 402                 retv = -EPERM;
 403                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 404                         break;
 405
 406                 /* remove any sticky options header with a zero option
 407                  * length, per RFC3542.
 408                  */
 409                 if (optlen == 0)
 410                         optval = NULL;
 411                 else if (!optval)
 412                         goto e_inval;
 413                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 414                          optlen & 0x7 || optlen > 8 * 255)
 415                         goto e_inval;
 416                 else {
 417                         new = memdup_user(optval, optlen);
 418                         if (IS_ERR(new)) {
 419                                 retv = PTR_ERR(new);
 420                                 break;
 421                         }
 422                         if (unlikely(ipv6_optlen(new) > optlen)) {
 423                                 kfree(new);
 424                                 goto e_inval;
 425                         }
 426                 }
 427
 428                 opt = rcu_dereference_protected(np->opt,
 429                                                 lockdep_sock_is_held(sk));
 430                 opt = ipv6_renew_options(sk, opt, optname, new);
 431                 kfree(new);
 432                 if (IS_ERR(opt)) {
 433                         retv = PTR_ERR(opt);
 434                         break;
 435                 }
 436
 437                 /* routing header option needs extra check */
 438                 retv = -EINVAL;
 439                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 440                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 441                         switch (rthdr->type) {
 442 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 443                         case IPV6_SRCRT_TYPE_2:
 444                                 if (rthdr->hdrlen != 2 ||
 445                                     rthdr->segments_left != 1)
 446                                         goto sticky_done;
 447
 448                                 break;
 449 #endif
 450                         case IPV6_SRCRT_TYPE_4:
 451                         {
 452                                 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
 453                                                           opt->srcrt;
 454
 455                                 if (!seg6_validate_srh(srh, optlen))
 456                                         goto sticky_done;
 457                                 break;
 458                         }
 459                         default:
 460                                 goto sticky_done;
 461                         }
 462                 }
 463
 464                 retv = 0;
 465                 opt = ipv6_update_options(sk, opt);
 466 sticky_done:
 467                 if (opt) {
 468                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 469                         txopt_put(opt);
 470                 }
 471                 break;
 472         }
 473
 474         case IPV6_PKTINFO:
 475         {
 476                 struct in6_pktinfo pkt;
 477
 478                 if (optlen == 0)
 479                         goto e_inval;
 480                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 481                         goto e_inval;
 482
 483                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 484                                 retv = -EFAULT;
 485                                 break;
 486                 }
 487                 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
 488                         goto e_inval;
 489
 490                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 491                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 492                 retv = 0;
 493                 break;
 494         }
 495
 496         case IPV6_2292PKTOPTIONS:
 497         {
 498                 struct ipv6_txoptions *opt = NULL;
 499                 struct msghdr msg;
 500                 struct flowi6 fl6;
 501                 struct ipcm6_cookie ipc6;
 502
 503                 memset(&fl6, 0, sizeof(fl6));
 504                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 505                 fl6.flowi6_mark = sk->sk_mark;
 506
 507                 if (optlen == 0)
 508                         goto update;
 509
 510                 /* 1K is probably excessive
 511                  * 1K is surely not enough, 2K per standard header is 16K.
 512                  */
 513                 retv = -EINVAL;
 514                 if (optlen > 64*1024)
 515                         break;
 516
 517                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 518                 retv = -ENOBUFS;
 519                 if (!opt)
 520                         break;
 521
 522                 memset(opt, 0, sizeof(*opt));
 523                 refcount_set(&opt->refcnt, 1);
 524                 opt->tot_len = sizeof(*opt) + optlen;
 525                 retv = -EFAULT;
 526                 if (copy_from_user(opt+1, optval, optlen))
 527                         goto done;
 528
 529                 msg.msg_controllen = optlen;
 530                 msg.msg_control = (void *)(opt+1);
 531                 ipc6.opt = opt;
 532
 533                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
 534                 if (retv)
 535                         goto done;
 536 update:
 537                 retv = 0;
 538                 opt = ipv6_update_options(sk, opt);
 539 done:
 540                 if (opt) {
 541                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 542                         txopt_put(opt);
 543                 }
 544                 break;
 545         }
 546         case IPV6_UNICAST_HOPS:
 547                 if (optlen < sizeof(int))
 548                         goto e_inval;
 549                 if (val > 255 || val < -1)
 550                         goto e_inval;
 551                 np->hop_limit = val;
 552                 retv = 0;
 553                 break;
 554
 555         case IPV6_MULTICAST_HOPS:
 556                 if (sk->sk_type == SOCK_STREAM)
 557                         break;
 558                 if (optlen < sizeof(int))
 559                         goto e_inval;
 560                 if (val > 255 || val < -1)
 561                         goto e_inval;
 562                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 563                 retv = 0;
 564                 break;
 565
 566         case IPV6_MULTICAST_LOOP:
 567                 if (optlen < sizeof(int))
 568                         goto e_inval;
 569                 if (val != valbool)
 570                         goto e_inval;
 571                 np->mc_loop = valbool;
 572                 retv = 0;
 573                 break;
 574
 575         case IPV6_UNICAST_IF:
 576         {
 577                 struct net_device *dev = NULL;
 578                 int ifindex;
 579
 580                 if (optlen != sizeof(int))
 581                         goto e_inval;
 582
 583                 ifindex = (__force int)ntohl((__force __be32)val);
 584                 if (ifindex == 0) {
 585                         np->ucast_oif = 0;
 586                         retv = 0;
 587                         break;
 588                 }
 589
 590                 dev = dev_get_by_index(net, ifindex);
 591                 retv = -EADDRNOTAVAIL;
 592                 if (!dev)
 593                         break;
 594                 dev_put(dev);
 595
 596                 retv = -EINVAL;
 597                 if (sk->sk_bound_dev_if)
 598                         break;
 599
 600                 np->ucast_oif = ifindex;
 601                 retv = 0;
 602                 break;
 603         }
 604
 605         case IPV6_MULTICAST_IF:
 606                 if (sk->sk_type == SOCK_STREAM)
 607                         break;
 608                 if (optlen < sizeof(int))
 609                         goto e_inval;
 610
 611                 if (val) {
 612                         struct net_device *dev;
 613                         int midx;
 614
 615                         rcu_read_lock();
 616
 617                         dev = dev_get_by_index_rcu(net, val);
 618                         if (!dev) {
 619                                 rcu_read_unlock();
 620                                 retv = -ENODEV;
 621                                 break;
 622                         }
 623                         midx = l3mdev_master_ifindex_rcu(dev);
 624
 625                         rcu_read_unlock();
 626
 627                         if (sk->sk_bound_dev_if &&
 628                             sk->sk_bound_dev_if != val &&
 629                             (!midx || midx != sk->sk_bound_dev_if))
 630                                 goto e_inval;
 631                 }
 632                 np->mcast_oif = val;
 633                 retv = 0;
 634                 break;
 635         case IPV6_ADD_MEMBERSHIP:
 636         case IPV6_DROP_MEMBERSHIP:
 637         {
 638                 struct ipv6_mreq mreq;
 639
 640                 if (optlen < sizeof(struct ipv6_mreq))
 641                         goto e_inval;
 642
 643                 retv = -EPROTO;
 644                 if (inet_sk(sk)->is_icsk)
 645                         break;
 646
 647                 retv = -EFAULT;
 648                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 649                         break;
 650
 651                 if (optname == IPV6_ADD_MEMBERSHIP)
 652                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 653                 else
 654                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 655                 break;
 656         }
 657         case IPV6_JOIN_ANYCAST:
 658         case IPV6_LEAVE_ANYCAST:
 659         {
 660                 struct ipv6_mreq mreq;
 661
 662                 if (optlen < sizeof(struct ipv6_mreq))
 663                         goto e_inval;
 664
 665                 retv = -EFAULT;
 666                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 667                         break;
 668
 669                 if (optname == IPV6_JOIN_ANYCAST)
 670                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 671                 else
 672                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 673                 break;
 674         }
 675         case IPV6_MULTICAST_ALL:
 676                 if (optlen < sizeof(int))
 677                         goto e_inval;
 678                 np->mc_all = valbool;
 679                 retv = 0;
 680                 break;
 681
 682         case MCAST_JOIN_GROUP:
 683         case MCAST_LEAVE_GROUP:
 684         {
 685                 struct group_req greq;
 686                 struct sockaddr_in6 *psin6;
 687
 688                 if (optlen < sizeof(struct group_req))
 689                         goto e_inval;
 690
 691                 retv = -EFAULT;
 692                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 693                         break;
 694                 if (greq.gr_group.ss_family != AF_INET6) {
 695                         retv = -EADDRNOTAVAIL;
 696                         break;
 697                 }
 698                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 699                 if (optname == MCAST_JOIN_GROUP)
 700                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 701                                                  &psin6->sin6_addr);
 702                 else
 703                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 704                                                  &psin6->sin6_addr);
 705                 break;
 706         }
 707         case MCAST_JOIN_SOURCE_GROUP:
 708         case MCAST_LEAVE_SOURCE_GROUP:
 709         case MCAST_BLOCK_SOURCE:
 710         case MCAST_UNBLOCK_SOURCE:
 711         {
 712                 struct group_source_req greqs;
 713                 int omode, add;
 714
 715                 if (optlen < sizeof(struct group_source_req))
 716                         goto e_inval;
 717                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 718                         retv = -EFAULT;
 719                         break;
 720                 }
 721                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 722                     greqs.gsr_source.ss_family != AF_INET6) {
 723                         retv = -EADDRNOTAVAIL;
 724                         break;
 725                 }
 726                 if (optname == MCAST_BLOCK_SOURCE) {
 727                         omode = MCAST_EXCLUDE;
 728                         add = 1;
 729                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 730                         omode = MCAST_EXCLUDE;
 731                         add = 0;
 732                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 733                         struct sockaddr_in6 *psin6;
 734
 735                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 736                         retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
 737                                                      &psin6->sin6_addr,
 738                                                      MCAST_INCLUDE);
 739                         /* prior join w/ different source is ok */
 740                         if (retv && retv != -EADDRINUSE)
 741                                 break;
 742                         omode = MCAST_INCLUDE;
 743                         add = 1;
 744                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 745                         omode = MCAST_INCLUDE;
 746                         add = 0;
 747                 }
 748                 retv = ip6_mc_source(add, omode, sk, &greqs);
 749                 break;
 750         }
 751         case MCAST_MSFILTER:
 752         {
 753                 struct group_filter *gsf;
 754
 755                 if (optlen < GROUP_FILTER_SIZE(0))
 756                         goto e_inval;
 757                 if (optlen > sysctl_optmem_max) {
 758                         retv = -ENOBUFS;
 759                         break;
 760                 }
 761                 gsf = memdup_user(optval, optlen);
 762                 if (IS_ERR(gsf)) {
 763                         retv = PTR_ERR(gsf);
 764                         break;
 765                 }
 766                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 767                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 768                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 769                         kfree(gsf);
 770                         retv = -ENOBUFS;
 771                         break;
 772                 }
 773                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 774                         kfree(gsf);
 775                         retv = -EINVAL;
 776                         break;
 777                 }
 778                 retv = ip6_mc_msfilter(sk, gsf);
 779                 kfree(gsf);
 780
 781                 break;
 782         }
 783         case IPV6_ROUTER_ALERT:
 784                 if (optlen < sizeof(int))
 785                         goto e_inval;
 786                 retv = ip6_ra_control(sk, val);
 787                 break;
 788         case IPV6_ROUTER_ALERT_ISOLATE:
 789                 if (optlen < sizeof(int))
 790                         goto e_inval;
 791                 np->rtalert_isolate = valbool;
 792                 retv = 0;
 793                 break;
 794         case IPV6_MTU_DISCOVER:
 795                 if (optlen < sizeof(int))
 796                         goto e_inval;
 797                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 798                         goto e_inval;
 799                 np->pmtudisc = val;
 800                 retv = 0;
 801                 break;
 802         case IPV6_MTU:
 803                 if (optlen < sizeof(int))
 804                         goto e_inval;
 805                 if (val && val < IPV6_MIN_MTU)
 806                         goto e_inval;
 807                 np->frag_size = val;
 808                 retv = 0;
 809                 break;
 810         case IPV6_RECVERR:
 811                 if (optlen < sizeof(int))
 812                         goto e_inval;
 813                 np->recverr = valbool;
 814                 if (!val)
 815                         skb_queue_purge(&sk->sk_error_queue);
 816                 retv = 0;
 817                 break;
 818         case IPV6_FLOWINFO_SEND:
 819                 if (optlen < sizeof(int))
 820                         goto e_inval;
 821                 np->sndflow = valbool;
 822                 retv = 0;
 823                 break;
 824         case IPV6_FLOWLABEL_MGR:
 825                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 826                 break;
 827         case IPV6_IPSEC_POLICY:
 828         case IPV6_XFRM_POLICY:
 829                 retv = -EPERM;
 830                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 831                         break;
 832                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 833                 break;
 834
 835         case IPV6_ADDR_PREFERENCES:
 836             {
 837                 unsigned int pref = 0;
 838                 unsigned int prefmask = ~0;
 839
 840                 if (optlen < sizeof(int))
 841                         goto e_inval;
 842
 843                 retv = -EINVAL;
 844
 845                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 846                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 847                                IPV6_PREFER_SRC_TMP|
 848                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 849                 case IPV6_PREFER_SRC_PUBLIC:
 850                         pref |= IPV6_PREFER_SRC_PUBLIC;
 851                         break;
 852                 case IPV6_PREFER_SRC_TMP:
 853                         pref |= IPV6_PREFER_SRC_TMP;
 854                         break;
 855                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 856                         break;
 857                 case 0:
 858                         goto pref_skip_pubtmp;
 859                 default:
 860                         goto e_inval;
 861                 }
 862
 863                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 864                               IPV6_PREFER_SRC_TMP);
 865 pref_skip_pubtmp:
 866
 867                 /* check HOME/COA conflicts */
 868                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 869                 case IPV6_PREFER_SRC_HOME:
 870                         break;
 871                 case IPV6_PREFER_SRC_COA:
 872                         pref |= IPV6_PREFER_SRC_COA;
 873                 case 0:
 874                         goto pref_skip_coa;
 875                 default:
 876                         goto e_inval;
 877                 }
 878
 879                 prefmask &= ~IPV6_PREFER_SRC_COA;
 880 pref_skip_coa:
 881
 882                 /* check CGA/NONCGA conflicts */
 883                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 884                 case IPV6_PREFER_SRC_CGA:
 885                 case IPV6_PREFER_SRC_NONCGA:
 886                 case 0:
 887                         break;
 888                 default:
 889                         goto e_inval;
 890                 }
 891
 892                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 893                 retv = 0;
 894
 895                 break;
 896             }
 897         case IPV6_MINHOPCOUNT:
 898                 if (optlen < sizeof(int))
 899                         goto e_inval;
 900                 if (val < 0 || val > 255)
 901                         goto e_inval;
 902                 np->min_hopcount = val;
 903                 retv = 0;
 904                 break;
 905         case IPV6_DONTFRAG:
 906                 np->dontfrag = valbool;
 907                 retv = 0;
 908                 break;
 909         case IPV6_AUTOFLOWLABEL:
 910                 np->autoflowlabel = valbool;
 911                 np->autoflowlabel_set = 1;
 912                 retv = 0;
 913                 break;
 914         case IPV6_RECVFRAGSIZE:
 915                 np->rxopt.bits.recvfragsize = valbool;
 916                 retv = 0;
 917                 break;
 918         }
 919
 920         release_sock(sk);
 921         if (needs_rtnl)
 922                 rtnl_unlock();
 923
 924         return retv;
 925
 926 e_inval:
 927         release_sock(sk);
 928         if (needs_rtnl)
 929                 rtnl_unlock();
 930         return -EINVAL;
 931 }
 932
 933 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 934                     char __user *optval, unsigned int optlen)
 935 {
 936         int err;
 937
 938         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 939                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 940
 941         if (level != SOL_IPV6)
 942                 return -ENOPROTOOPT;
 943
 944         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 945 #ifdef CONFIG_NETFILTER
 946         /* we need to exclude all possible ENOPROTOOPTs except default case */
 947         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 948                         optname != IPV6_XFRM_POLICY)
 949                 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
 950 #endif
 951         return err;
 952 }
 953 EXPORT_SYMBOL(ipv6_setsockopt);
 954
 955 #ifdef CONFIG_COMPAT
 956 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 957                            char __user *optval, unsigned int optlen)
 958 {
 959         int err;
 960
 961         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 962                 if (udp_prot.compat_setsockopt != NULL)
 963                         return udp_prot.compat_setsockopt(sk, level, optname,
 964                                                           optval, optlen);
 965                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 966         }
 967
 968         if (level != SOL_IPV6)
 969                 return -ENOPROTOOPT;
 970
 971         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 972                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 973                         ipv6_setsockopt);
 974
 975         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 976 #ifdef CONFIG_NETFILTER
 977         /* we need to exclude all possible ENOPROTOOPTs except default case */
 978         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 979             optname != IPV6_XFRM_POLICY)
 980                 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
 981                                            optlen);
 982 #endif
 983         return err;
 984 }
 985 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 986 #endif
 987
 988 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 989                                   int optname, char __user *optval, int len)
 990 {
 991         struct ipv6_opt_hdr *hdr;
 992
 993         if (!opt)
 994                 return 0;
 995
 996         switch (optname) {
 997         case IPV6_HOPOPTS:
 998                 hdr = opt->hopopt;
 999                 break;
1000         case IPV6_RTHDRDSTOPTS:
1001                 hdr = opt->dst0opt;
1002                 break;
1003         case IPV6_RTHDR:
1004                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1005                 break;
1006         case IPV6_DSTOPTS:
1007                 hdr = opt->dst1opt;
1008                 break;
1009         default:
1010                 return -EINVAL; /* should not happen */
1011         }
1012
1013         if (!hdr)
1014                 return 0;
1015
1016         len = min_t(unsigned int, len, ipv6_optlen(hdr));
1017         if (copy_to_user(optval, hdr, len))
1018                 return -EFAULT;
1019         return len;
1020 }
1021
1022 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1023                     char __user *optval, int __user *optlen, unsigned int flags)
1024 {
1025         struct ipv6_pinfo *np = inet6_sk(sk);
1026         int len;
1027         int val;
1028
1029         if (ip6_mroute_opt(optname))
1030                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1031
1032         if (get_user(len, optlen))
1033                 return -EFAULT;
1034         switch (optname) {
1035         case IPV6_ADDRFORM:
1036                 if (sk->sk_protocol != IPPROTO_UDP &&
1037                     sk->sk_protocol != IPPROTO_UDPLITE &&
1038                     sk->sk_protocol != IPPROTO_TCP)
1039                         return -ENOPROTOOPT;
1040                 if (sk->sk_state != TCP_ESTABLISHED)
1041                         return -ENOTCONN;
1042                 val = sk->sk_family;
1043                 break;
1044         case MCAST_MSFILTER:
1045         {
1046                 struct group_filter gsf;
1047                 int err;
1048
1049                 if (len < GROUP_FILTER_SIZE(0))
1050                         return -EINVAL;
1051                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1052                         return -EFAULT;
1053                 if (gsf.gf_group.ss_family != AF_INET6)
1054                         return -EADDRNOTAVAIL;
1055                 lock_sock(sk);
1056                 err = ip6_mc_msfget(sk, &gsf,
1057                         (struct group_filter __user *)optval, optlen);
1058                 release_sock(sk);
1059                 return err;
1060         }
1061
1062         case IPV6_2292PKTOPTIONS:
1063         {
1064                 struct msghdr msg;
1065                 struct sk_buff *skb;
1066
1067                 if (sk->sk_type != SOCK_STREAM)
1068                         return -ENOPROTOOPT;
1069
1070                 msg.msg_control = optval;
1071                 msg.msg_controllen = len;
1072                 msg.msg_flags = flags;
1073
1074                 lock_sock(sk);
1075                 skb = np->pktoptions;
1076                 if (skb)
1077                         ip6_datagram_recv_ctl(sk, &msg, skb);
1078                 release_sock(sk);
1079                 if (!skb) {
1080                         if (np->rxopt.bits.rxinfo) {
1081                                 struct in6_pktinfo src_info;
1082                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1083                                         np->sticky_pktinfo.ipi6_ifindex;
1084                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1085                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1086                         }
1087                         if (np->rxopt.bits.rxhlim) {
1088                                 int hlim = np->mcast_hops;
1089                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1090                         }
1091                         if (np->rxopt.bits.rxtclass) {
1092                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1093
1094                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1095                         }
1096                         if (np->rxopt.bits.rxoinfo) {
1097                                 struct in6_pktinfo src_info;
1098                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1099                                         np->sticky_pktinfo.ipi6_ifindex;
1100                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1101                                                                      np->sticky_pktinfo.ipi6_addr;
1102                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1103                         }
1104                         if (np->rxopt.bits.rxohlim) {
1105                                 int hlim = np->mcast_hops;
1106                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1107                         }
1108                         if (np->rxopt.bits.rxflow) {
1109                                 __be32 flowinfo = np->rcv_flowinfo;
1110
1111                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1112                         }
1113                 }
1114                 len -= msg.msg_controllen;
1115                 return put_user(len, optlen);
1116         }
1117         case IPV6_MTU:
1118         {
1119                 struct dst_entry *dst;
1120
1121                 val = 0;
1122                 rcu_read_lock();
1123                 dst = __sk_dst_get(sk);
1124                 if (dst)
1125                         val = dst_mtu(dst);
1126                 rcu_read_unlock();
1127                 if (!val)
1128                         return -ENOTCONN;
1129                 break;
1130         }
1131
1132         case IPV6_V6ONLY:
1133                 val = sk->sk_ipv6only;
1134                 break;
1135
1136         case IPV6_RECVPKTINFO:
1137                 val = np->rxopt.bits.rxinfo;
1138                 break;
1139
1140         case IPV6_2292PKTINFO:
1141                 val = np->rxopt.bits.rxoinfo;
1142                 break;
1143
1144         case IPV6_RECVHOPLIMIT:
1145                 val = np->rxopt.bits.rxhlim;
1146                 break;
1147
1148         case IPV6_2292HOPLIMIT:
1149                 val = np->rxopt.bits.rxohlim;
1150                 break;
1151
1152         case IPV6_RECVRTHDR:
1153                 val = np->rxopt.bits.srcrt;
1154                 break;
1155
1156         case IPV6_2292RTHDR:
1157                 val = np->rxopt.bits.osrcrt;
1158                 break;
1159
1160         case IPV6_HOPOPTS:
1161         case IPV6_RTHDRDSTOPTS:
1162         case IPV6_RTHDR:
1163         case IPV6_DSTOPTS:
1164         {
1165                 struct ipv6_txoptions *opt;
1166
1167                 lock_sock(sk);
1168                 opt = rcu_dereference_protected(np->opt,
1169                                                 lockdep_sock_is_held(sk));
1170                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1171                 release_sock(sk);
1172                 /* check if ipv6_getsockopt_sticky() returns err code */
1173                 if (len < 0)
1174                         return len;
1175                 return put_user(len, optlen);
1176         }
1177
1178         case IPV6_RECVHOPOPTS:
1179                 val = np->rxopt.bits.hopopts;
1180                 break;
1181
1182         case IPV6_2292HOPOPTS:
1183                 val = np->rxopt.bits.ohopopts;
1184                 break;
1185
1186         case IPV6_RECVDSTOPTS:
1187                 val = np->rxopt.bits.dstopts;
1188                 break;
1189
1190         case IPV6_2292DSTOPTS:
1191                 val = np->rxopt.bits.odstopts;
1192                 break;
1193
1194         case IPV6_TCLASS:
1195                 val = np->tclass;
1196                 break;
1197
1198         case IPV6_RECVTCLASS:
1199                 val = np->rxopt.bits.rxtclass;
1200                 break;
1201
1202         case IPV6_FLOWINFO:
1203                 val = np->rxopt.bits.rxflow;
1204                 break;
1205
1206         case IPV6_RECVPATHMTU:
1207                 val = np->rxopt.bits.rxpmtu;
1208                 break;
1209
1210         case IPV6_PATHMTU:
1211         {
1212                 struct dst_entry *dst;
1213                 struct ip6_mtuinfo mtuinfo;
1214
1215                 if (len < sizeof(mtuinfo))
1216                         return -EINVAL;
1217
1218                 len = sizeof(mtuinfo);
1219                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1220
1221                 rcu_read_lock();
1222                 dst = __sk_dst_get(sk);
1223                 if (dst)
1224                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1225                 rcu_read_unlock();
1226                 if (!mtuinfo.ip6m_mtu)
1227                         return -ENOTCONN;
1228
1229                 if (put_user(len, optlen))
1230                         return -EFAULT;
1231                 if (copy_to_user(optval, &mtuinfo, len))
1232                         return -EFAULT;
1233
1234                 return 0;
1235         }
1236
1237         case IPV6_TRANSPARENT:
1238                 val = inet_sk(sk)->transparent;
1239                 break;
1240
1241         case IPV6_FREEBIND:
1242                 val = inet_sk(sk)->freebind;
1243                 break;
1244
1245         case IPV6_RECVORIGDSTADDR:
1246                 val = np->rxopt.bits.rxorigdstaddr;
1247                 break;
1248
1249         case IPV6_UNICAST_HOPS:
1250         case IPV6_MULTICAST_HOPS:
1251         {
1252                 struct dst_entry *dst;
1253
1254                 if (optname == IPV6_UNICAST_HOPS)
1255                         val = np->hop_limit;
1256                 else
1257                         val = np->mcast_hops;
1258
1259                 if (val < 0) {
1260                         rcu_read_lock();
1261                         dst = __sk_dst_get(sk);
1262                         if (dst)
1263                                 val = ip6_dst_hoplimit(dst);
1264                         rcu_read_unlock();
1265                 }
1266
1267                 if (val < 0)
1268                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1269                 break;
1270         }
1271
1272         case IPV6_MULTICAST_LOOP:
1273                 val = np->mc_loop;
1274                 break;
1275
1276         case IPV6_MULTICAST_IF:
1277                 val = np->mcast_oif;
1278                 break;
1279
1280         case IPV6_MULTICAST_ALL:
1281                 val = np->mc_all;
1282                 break;
1283
1284         case IPV6_UNICAST_IF:
1285                 val = (__force int)htonl((__u32) np->ucast_oif);
1286                 break;
1287
1288         case IPV6_MTU_DISCOVER:
1289                 val = np->pmtudisc;
1290                 break;
1291
1292         case IPV6_RECVERR:
1293                 val = np->recverr;
1294                 break;
1295
1296         case IPV6_FLOWINFO_SEND:
1297                 val = np->sndflow;
1298                 break;
1299
1300         case IPV6_FLOWLABEL_MGR:
1301         {
1302                 struct in6_flowlabel_req freq;
1303                 int flags;
1304
1305                 if (len < sizeof(freq))
1306                         return -EINVAL;
1307
1308                 if (copy_from_user(&freq, optval, sizeof(freq)))
1309                         return -EFAULT;
1310
1311                 if (freq.flr_action != IPV6_FL_A_GET)
1312                         return -EINVAL;
1313
1314                 len = sizeof(freq);
1315                 flags = freq.flr_flags;
1316
1317                 memset(&freq, 0, sizeof(freq));
1318
1319                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1320                 if (val < 0)
1321                         return val;
1322
1323                 if (put_user(len, optlen))
1324                         return -EFAULT;
1325                 if (copy_to_user(optval, &freq, len))
1326                         return -EFAULT;
1327
1328                 return 0;
1329         }
1330
1331         case IPV6_ADDR_PREFERENCES:
1332                 val = 0;
1333
1334                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1335                         val |= IPV6_PREFER_SRC_TMP;
1336                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1337                         val |= IPV6_PREFER_SRC_PUBLIC;
1338                 else {
1339                         /* XXX: should we return system default? */
1340                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1341                 }
1342
1343                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1344                         val |= IPV6_PREFER_SRC_COA;
1345                 else
1346                         val |= IPV6_PREFER_SRC_HOME;
1347                 break;
1348
1349         case IPV6_MINHOPCOUNT:
1350                 val = np->min_hopcount;
1351                 break;
1352
1353         case IPV6_DONTFRAG:
1354                 val = np->dontfrag;
1355                 break;
1356
1357         case IPV6_AUTOFLOWLABEL:
1358                 val = ip6_autoflowlabel(sock_net(sk), np);
1359                 break;
1360
1361         case IPV6_RECVFRAGSIZE:
1362                 val = np->rxopt.bits.recvfragsize;
1363                 break;
1364
1365         case IPV6_ROUTER_ALERT_ISOLATE:
1366                 val = np->rtalert_isolate;
1367                 break;
1368
1369         default:
1370                 return -ENOPROTOOPT;
1371         }
1372         len = min_t(unsigned int, sizeof(int), len);
1373         if (put_user(len, optlen))
1374                 return -EFAULT;
1375         if (copy_to_user(optval, &val, len))
1376                 return -EFAULT;
1377         return 0;
1378 }
1379
1380 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1381                     char __user *optval, int __user *optlen)
1382 {
1383         int err;
1384
1385         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1386                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1387
1388         if (level != SOL_IPV6)
1389                 return -ENOPROTOOPT;
1390
1391         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1392 #ifdef CONFIG_NETFILTER
1393         /* we need to exclude all possible ENOPROTOOPTs except default case */
1394         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1395                 int len;
1396
1397                 if (get_user(len, optlen))
1398                         return -EFAULT;
1399
1400                 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1401                 if (err >= 0)
1402                         err = put_user(len, optlen);
1403         }
1404 #endif
1405         return err;
1406 }
1407 EXPORT_SYMBOL(ipv6_getsockopt);
1408
1409 #ifdef CONFIG_COMPAT
1410 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1411                            char __user *optval, int __user *optlen)
1412 {
1413         int err;
1414
1415         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1416                 if (udp_prot.compat_getsockopt != NULL)
1417                         return udp_prot.compat_getsockopt(sk, level, optname,
1418                                                           optval, optlen);
1419                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1420         }
1421
1422         if (level != SOL_IPV6)
1423                 return -ENOPROTOOPT;
1424
1425         if (optname == MCAST_MSFILTER)
1426                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1427                         ipv6_getsockopt);
1428
1429         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1430                                  MSG_CMSG_COMPAT);
1431 #ifdef CONFIG_NETFILTER
1432         /* we need to exclude all possible ENOPROTOOPTs except default case */
1433         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1434                 int len;
1435
1436                 if (get_user(len, optlen))
1437                         return -EFAULT;
1438
1439                 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1440                 if (err >= 0)
1441                         err = put_user(len, optlen);
1442         }
1443 #endif
1444         return err;
1445 }
1446 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1447 #endif