net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  *
  15  *      FIXME: Make the setsockopt code POSIX compliant: That is
  16  *
  17  *      o       Truncate getsockopt returns
  18  *      o       Return an optlen of the truncated length if need be
  19  *
  20  *      Changes:
  21  *      David L Stevens <dlstevens@us.ibm.com>:
  22  *              - added multicast source filtering API for MLDv2
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/capability.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/socket.h>
  30 #include <linux/sockios.h>
  31 #include <linux/net.h>
  32 #include <linux/in6.h>
  33 #include <linux/mroute6.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/init.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/netfilter.h>
  39 #include <linux/slab.h>
  40
  41 #include <net/sock.h>
  42 #include <net/snmp.h>
  43 #include <net/ipv6.h>
  44 #include <net/ndisc.h>
  45 #include <net/protocol.h>
  46 #include <net/transp_v6.h>
  47 #include <net/ip6_route.h>
  48 #include <net/addrconf.h>
  49 #include <net/inet_common.h>
  50 #include <net/tcp.h>
  51 #include <net/udp.h>
  52 #include <net/udplite.h>
  53 #include <net/xfrm.h>
  54 #include <net/compat.h>
  55
  56 #include <asm/uaccess.h>
  57
  58 struct ip6_ra_chain *ip6_ra_chain;
  59 DEFINE_RWLOCK(ip6_ra_lock);
  60
  61 int ip6_ra_control(struct sock *sk, int sel)
  62 {
  63         struct ip6_ra_chain *ra, *new_ra, **rap;
  64
  65         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  66         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  67                 return -ENOPROTOOPT;
  68
  69         new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  70
  71         write_lock_bh(&ip6_ra_lock);
  72         for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
  73                 if (ra->sk == sk) {
  74                         if (sel >= 0) {
  75                                 write_unlock_bh(&ip6_ra_lock);
  76                                 kfree(new_ra);
  77                                 return -EADDRINUSE;
  78                         }
  79
  80                         *rap = ra->next;
  81                         write_unlock_bh(&ip6_ra_lock);
  82
  83                         sock_put(sk);
  84                         kfree(ra);
  85                         return 0;
  86                 }
  87         }
  88         if (!new_ra) {
  89                 write_unlock_bh(&ip6_ra_lock);
  90                 return -ENOBUFS;
  91         }
  92         new_ra->sk = sk;
  93         new_ra->sel = sel;
  94         new_ra->next = ra;
  95         *rap = new_ra;
  96         sock_hold(sk);
  97         write_unlock_bh(&ip6_ra_lock);
  98         return 0;
  99 }
 100
 101 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 102                                            struct ipv6_txoptions *opt)
 103 {
 104         if (inet_sk(sk)->is_icsk) {
 105                 if (opt &&
 106                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 107                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 108                         struct inet_connection_sock *icsk = inet_csk(sk);
 109                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 110                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 111                 }
 112         }
 113         opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
 114                    opt);
 115         sk_dst_reset(sk);
 116
 117         return opt;
 118 }
 119
 120 static bool setsockopt_needs_rtnl(int optname)
 121 {
 122         switch (optname) {
 123         case IPV6_ADDRFORM:
 124         case IPV6_ADD_MEMBERSHIP:
 125         case IPV6_DROP_MEMBERSHIP:
 126         case IPV6_JOIN_ANYCAST:
 127         case IPV6_LEAVE_ANYCAST:
 128         case MCAST_JOIN_GROUP:
 129         case MCAST_LEAVE_GROUP:
 130         case MCAST_JOIN_SOURCE_GROUP:
 131         case MCAST_LEAVE_SOURCE_GROUP:
 132         case MCAST_BLOCK_SOURCE:
 133         case MCAST_UNBLOCK_SOURCE:
 134         case MCAST_MSFILTER:
 135                 return true;
 136         }
 137         return false;
 138 }
 139
 140 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 141                     char __user *optval, unsigned int optlen)
 142 {
 143         struct ipv6_pinfo *np = inet6_sk(sk);
 144         struct net *net = sock_net(sk);
 145         int val, valbool;
 146         int retv = -ENOPROTOOPT;
 147         bool needs_rtnl = setsockopt_needs_rtnl(optname);
 148
 149         if (!optval)
 150                 val = 0;
 151         else {
 152                 if (optlen >= sizeof(int)) {
 153                         if (get_user(val, (int __user *) optval))
 154                                 return -EFAULT;
 155                 } else
 156                         val = 0;
 157         }
 158
 159         valbool = (val != 0);
 160
 161         if (ip6_mroute_opt(optname))
 162                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 163
 164         if (needs_rtnl)
 165                 rtnl_lock();
 166         lock_sock(sk);
 167
 168         /* Another thread has converted the socket into IPv4 with
 169          * IPV6_ADDRFORM concurrently.
 170          */
 171         if (unlikely(sk->sk_family != AF_INET6))
 172                 goto unlock;
 173
 174         switch (optname) {
 175
 176         case IPV6_ADDRFORM:
 177                 if (optlen < sizeof(int))
 178                         goto e_inval;
 179                 if (val == PF_INET) {
 180                         struct ipv6_txoptions *opt;
 181                         struct sk_buff *pktopt;
 182
 183                         if (sk->sk_type == SOCK_RAW)
 184                                 break;
 185
 186                         if (sk->sk_protocol == IPPROTO_UDP ||
 187                             sk->sk_protocol == IPPROTO_UDPLITE) {
 188                                 struct udp_sock *up = udp_sk(sk);
 189                                 if (up->pending == AF_INET6) {
 190                                         retv = -EBUSY;
 191                                         break;
 192                                 }
 193                         } else if (sk->sk_protocol == IPPROTO_TCP) {
 194                                 if (sk->sk_prot != &tcpv6_prot) {
 195                                         retv = -EBUSY;
 196                                         break;
 197                                 }
 198                         } else {
 199                                 break;
 200                         }
 201
 202                         if (sk->sk_state != TCP_ESTABLISHED) {
 203                                 retv = -ENOTCONN;
 204                                 break;
 205                         }
 206
 207                         if (ipv6_only_sock(sk) ||
 208                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 209                                 retv = -EADDRNOTAVAIL;
 210                                 break;
 211                         }
 212
 213                         fl6_free_socklist(sk);
 214                         __ipv6_sock_mc_close(sk);
 215                         __ipv6_sock_ac_close(sk);
 216
 217                         /*
 218                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 219                          * remove it from the refcnt debug socks count in the
 220                          * original family...
 221                          */
 222                         sk_refcnt_debug_dec(sk);
 223
 224                         if (sk->sk_protocol == IPPROTO_TCP) {
 225                                 struct inet_connection_sock *icsk = inet_csk(sk);
 226                                 local_bh_disable();
 227                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 228                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 229                                 local_bh_enable();
 230                                 sk->sk_prot = &tcp_prot;
 231                                 icsk->icsk_af_ops = &ipv4_specific;
 232                                 sk->sk_socket->ops = &inet_stream_ops;
 233                                 sk->sk_family = PF_INET;
 234                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 235                         } else {
 236                                 struct proto *prot = &udp_prot;
 237
 238                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 239                                         prot = &udplite_prot;
 240                                 local_bh_disable();
 241                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 242                                 sock_prot_inuse_add(net, prot, 1);
 243                                 local_bh_enable();
 244                                 sk->sk_prot = prot;
 245                                 sk->sk_socket->ops = &inet_dgram_ops;
 246                                 sk->sk_family = PF_INET;
 247                         }
 248                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
 249                                    NULL);
 250                         if (opt) {
 251                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 252                                 txopt_put(opt);
 253                         }
 254                         pktopt = xchg(&np->pktoptions, NULL);
 255                         kfree_skb(pktopt);
 256
 257                         sk->sk_destruct = inet_sock_destruct;
 258                         /*
 259                          * ... and add it to the refcnt debug socks count
 260                          * in the new family. -acme
 261                          */
 262                         sk_refcnt_debug_inc(sk);
 263                         module_put(THIS_MODULE);
 264                         retv = 0;
 265                         break;
 266                 }
 267                 goto e_inval;
 268
 269         case IPV6_V6ONLY:
 270                 if (optlen < sizeof(int) ||
 271                     inet_sk(sk)->inet_num)
 272                         goto e_inval;
 273                 sk->sk_ipv6only = valbool;
 274                 retv = 0;
 275                 break;
 276
 277         case IPV6_RECVPKTINFO:
 278                 if (optlen < sizeof(int))
 279                         goto e_inval;
 280                 np->rxopt.bits.rxinfo = valbool;
 281                 retv = 0;
 282                 break;
 283
 284         case IPV6_2292PKTINFO:
 285                 if (optlen < sizeof(int))
 286                         goto e_inval;
 287                 np->rxopt.bits.rxoinfo = valbool;
 288                 retv = 0;
 289                 break;
 290
 291         case IPV6_RECVHOPLIMIT:
 292                 if (optlen < sizeof(int))
 293                         goto e_inval;
 294                 np->rxopt.bits.rxhlim = valbool;
 295                 retv = 0;
 296                 break;
 297
 298         case IPV6_2292HOPLIMIT:
 299                 if (optlen < sizeof(int))
 300                         goto e_inval;
 301                 np->rxopt.bits.rxohlim = valbool;
 302                 retv = 0;
 303                 break;
 304
 305         case IPV6_RECVRTHDR:
 306                 if (optlen < sizeof(int))
 307                         goto e_inval;
 308                 np->rxopt.bits.srcrt = valbool;
 309                 retv = 0;
 310                 break;
 311
 312         case IPV6_2292RTHDR:
 313                 if (optlen < sizeof(int))
 314                         goto e_inval;
 315                 np->rxopt.bits.osrcrt = valbool;
 316                 retv = 0;
 317                 break;
 318
 319         case IPV6_RECVHOPOPTS:
 320                 if (optlen < sizeof(int))
 321                         goto e_inval;
 322                 np->rxopt.bits.hopopts = valbool;
 323                 retv = 0;
 324                 break;
 325
 326         case IPV6_2292HOPOPTS:
 327                 if (optlen < sizeof(int))
 328                         goto e_inval;
 329                 np->rxopt.bits.ohopopts = valbool;
 330                 retv = 0;
 331                 break;
 332
 333         case IPV6_RECVDSTOPTS:
 334                 if (optlen < sizeof(int))
 335                         goto e_inval;
 336                 np->rxopt.bits.dstopts = valbool;
 337                 retv = 0;
 338                 break;
 339
 340         case IPV6_2292DSTOPTS:
 341                 if (optlen < sizeof(int))
 342                         goto e_inval;
 343                 np->rxopt.bits.odstopts = valbool;
 344                 retv = 0;
 345                 break;
 346
 347         case IPV6_TCLASS:
 348                 if (optlen < sizeof(int))
 349                         goto e_inval;
 350                 if (val < -1 || val > 0xff)
 351                         goto e_inval;
 352                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 353                 if (val == -1)
 354                         val = 0;
 355                 np->tclass = val;
 356                 retv = 0;
 357                 break;
 358
 359         case IPV6_RECVTCLASS:
 360                 if (optlen < sizeof(int))
 361                         goto e_inval;
 362                 np->rxopt.bits.rxtclass = valbool;
 363                 retv = 0;
 364                 break;
 365
 366         case IPV6_FLOWINFO:
 367                 if (optlen < sizeof(int))
 368                         goto e_inval;
 369                 np->rxopt.bits.rxflow = valbool;
 370                 retv = 0;
 371                 break;
 372
 373         case IPV6_RECVPATHMTU:
 374                 if (optlen < sizeof(int))
 375                         goto e_inval;
 376                 np->rxopt.bits.rxpmtu = valbool;
 377                 retv = 0;
 378                 break;
 379
 380         case IPV6_TRANSPARENT:
 381                 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 382                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 383                         retv = -EPERM;
 384                         break;
 385                 }
 386                 if (optlen < sizeof(int))
 387                         goto e_inval;
 388                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 389                 inet_sk(sk)->transparent = valbool;
 390                 retv = 0;
 391                 break;
 392
 393         case IPV6_RECVORIGDSTADDR:
 394                 if (optlen < sizeof(int))
 395                         goto e_inval;
 396                 np->rxopt.bits.rxorigdstaddr = valbool;
 397                 retv = 0;
 398                 break;
 399
 400         case IPV6_HOPOPTS:
 401         case IPV6_RTHDRDSTOPTS:
 402         case IPV6_RTHDR:
 403         case IPV6_DSTOPTS:
 404         {
 405                 struct ipv6_txoptions *opt;
 406                 struct ipv6_opt_hdr *new = NULL;
 407
 408                 /* hop-by-hop / destination options are privileged option */
 409                 retv = -EPERM;
 410                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 411                         break;
 412
 413                 /* remove any sticky options header with a zero option
 414                  * length, per RFC3542.
 415                  */
 416                 if (optlen == 0)
 417                         optval = NULL;
 418                 else if (!optval)
 419                         goto e_inval;
 420                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 421                          optlen & 0x7 || optlen > 8 * 255)
 422                         goto e_inval;
 423                 else {
 424                         new = memdup_user(optval, optlen);
 425                         if (IS_ERR(new)) {
 426                                 retv = PTR_ERR(new);
 427                                 break;
 428                         }
 429                         if (unlikely(ipv6_optlen(new) > optlen)) {
 430                                 kfree(new);
 431                                 goto e_inval;
 432                         }
 433                 }
 434
 435                 opt = rcu_dereference_protected(np->opt,
 436                                                 lockdep_sock_is_held(sk));
 437                 opt = ipv6_renew_options(sk, opt, optname, new);
 438                 kfree(new);
 439                 if (IS_ERR(opt)) {
 440                         retv = PTR_ERR(opt);
 441                         break;
 442                 }
 443
 444                 /* routing header option needs extra check */
 445                 retv = -EINVAL;
 446                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 447                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 448                         switch (rthdr->type) {
 449 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 450                         case IPV6_SRCRT_TYPE_2:
 451                                 if (rthdr->hdrlen != 2 ||
 452                                     rthdr->segments_left != 1)
 453                                         goto sticky_done;
 454
 455                                 break;
 456 #endif
 457                         default:
 458                                 goto sticky_done;
 459                         }
 460                 }
 461
 462                 retv = 0;
 463                 opt = ipv6_update_options(sk, opt);
 464 sticky_done:
 465                 if (opt) {
 466                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 467                         txopt_put(opt);
 468                 }
 469                 break;
 470         }
 471
 472         case IPV6_PKTINFO:
 473         {
 474                 struct in6_pktinfo pkt;
 475
 476                 if (optlen == 0)
 477                         goto e_inval;
 478                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 479                         goto e_inval;
 480
 481                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 482                                 retv = -EFAULT;
 483                                 break;
 484                 }
 485                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 486                         goto e_inval;
 487
 488                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 489                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 490                 retv = 0;
 491                 break;
 492         }
 493
 494         case IPV6_2292PKTOPTIONS:
 495         {
 496                 struct ipv6_txoptions *opt = NULL;
 497                 struct msghdr msg;
 498                 struct flowi6 fl6;
 499                 struct sockcm_cookie sockc_junk;
 500                 struct ipcm6_cookie ipc6;
 501
 502                 memset(&fl6, 0, sizeof(fl6));
 503                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 504                 fl6.flowi6_mark = sk->sk_mark;
 505
 506                 if (optlen == 0)
 507                         goto update;
 508
 509                 /* 1K is probably excessive
 510                  * 1K is surely not enough, 2K per standard header is 16K.
 511                  */
 512                 retv = -EINVAL;
 513                 if (optlen > 64*1024)
 514                         break;
 515
 516                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 517                 retv = -ENOBUFS;
 518                 if (!opt)
 519                         break;
 520
 521                 memset(opt, 0, sizeof(*opt));
 522                 atomic_set(&opt->refcnt, 1);
 523                 opt->tot_len = sizeof(*opt) + optlen;
 524                 retv = -EFAULT;
 525                 if (copy_from_user(opt+1, optval, optlen))
 526                         goto done;
 527
 528                 msg.msg_controllen = optlen;
 529                 msg.msg_control = (void *)(opt+1);
 530                 ipc6.opt = opt;
 531
 532                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
 533                 if (retv)
 534                         goto done;
 535 update:
 536                 retv = 0;
 537                 opt = ipv6_update_options(sk, opt);
 538 done:
 539                 if (opt) {
 540                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 541                         txopt_put(opt);
 542                 }
 543                 break;
 544         }
 545         case IPV6_UNICAST_HOPS:
 546                 if (optlen < sizeof(int))
 547                         goto e_inval;
 548                 if (val > 255 || val < -1)
 549                         goto e_inval;
 550                 np->hop_limit = val;
 551                 retv = 0;
 552                 break;
 553
 554         case IPV6_MULTICAST_HOPS:
 555                 if (sk->sk_type == SOCK_STREAM)
 556                         break;
 557                 if (optlen < sizeof(int))
 558                         goto e_inval;
 559                 if (val > 255 || val < -1)
 560                         goto e_inval;
 561                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 562                 retv = 0;
 563                 break;
 564
 565         case IPV6_MULTICAST_LOOP:
 566                 if (optlen < sizeof(int))
 567                         goto e_inval;
 568                 if (val != valbool)
 569                         goto e_inval;
 570                 np->mc_loop = valbool;
 571                 retv = 0;
 572                 break;
 573
 574         case IPV6_UNICAST_IF:
 575         {
 576                 struct net_device *dev = NULL;
 577                 int ifindex;
 578
 579                 if (optlen != sizeof(int))
 580                         goto e_inval;
 581
 582                 ifindex = (__force int)ntohl((__force __be32)val);
 583                 if (ifindex == 0) {
 584                         np->ucast_oif = 0;
 585                         retv = 0;
 586                         break;
 587                 }
 588
 589                 dev = dev_get_by_index(net, ifindex);
 590                 retv = -EADDRNOTAVAIL;
 591                 if (!dev)
 592                         break;
 593                 dev_put(dev);
 594
 595                 retv = -EINVAL;
 596                 if (sk->sk_bound_dev_if)
 597                         break;
 598
 599                 np->ucast_oif = ifindex;
 600                 retv = 0;
 601                 break;
 602         }
 603
 604         case IPV6_MULTICAST_IF:
 605                 if (sk->sk_type == SOCK_STREAM)
 606                         break;
 607                 if (optlen < sizeof(int))
 608                         goto e_inval;
 609
 610                 if (val) {
 611                         struct net_device *dev;
 612                         int midx;
 613
 614                         rcu_read_lock();
 615
 616                         dev = dev_get_by_index_rcu(net, val);
 617                         if (!dev) {
 618                                 rcu_read_unlock();
 619                                 retv = -ENODEV;
 620                                 break;
 621                         }
 622                         midx = l3mdev_master_ifindex_rcu(dev);
 623
 624                         rcu_read_unlock();
 625
 626                         if (sk->sk_bound_dev_if &&
 627                             sk->sk_bound_dev_if != val &&
 628                             (!midx || midx != sk->sk_bound_dev_if))
 629                                 goto e_inval;
 630                 }
 631                 np->mcast_oif = val;
 632                 retv = 0;
 633                 break;
 634         case IPV6_ADD_MEMBERSHIP:
 635         case IPV6_DROP_MEMBERSHIP:
 636         {
 637                 struct ipv6_mreq mreq;
 638
 639                 if (optlen < sizeof(struct ipv6_mreq))
 640                         goto e_inval;
 641
 642                 retv = -EPROTO;
 643                 if (inet_sk(sk)->is_icsk)
 644                         break;
 645
 646                 retv = -EFAULT;
 647                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 648                         break;
 649
 650                 if (optname == IPV6_ADD_MEMBERSHIP)
 651                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 652                 else
 653                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 654                 break;
 655         }
 656         case IPV6_JOIN_ANYCAST:
 657         case IPV6_LEAVE_ANYCAST:
 658         {
 659                 struct ipv6_mreq mreq;
 660
 661                 if (optlen < sizeof(struct ipv6_mreq))
 662                         goto e_inval;
 663
 664                 retv = -EFAULT;
 665                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 666                         break;
 667
 668                 if (optname == IPV6_JOIN_ANYCAST)
 669                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 670                 else
 671                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 672                 break;
 673         }
 674         case MCAST_JOIN_GROUP:
 675         case MCAST_LEAVE_GROUP:
 676         {
 677                 struct group_req greq;
 678                 struct sockaddr_in6 *psin6;
 679
 680                 if (optlen < sizeof(struct group_req))
 681                         goto e_inval;
 682
 683                 retv = -EFAULT;
 684                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 685                         break;
 686                 if (greq.gr_group.ss_family != AF_INET6) {
 687                         retv = -EADDRNOTAVAIL;
 688                         break;
 689                 }
 690                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 691                 if (optname == MCAST_JOIN_GROUP)
 692                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 693                                                  &psin6->sin6_addr);
 694                 else
 695                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 696                                                  &psin6->sin6_addr);
 697                 break;
 698         }
 699         case MCAST_JOIN_SOURCE_GROUP:
 700         case MCAST_LEAVE_SOURCE_GROUP:
 701         case MCAST_BLOCK_SOURCE:
 702         case MCAST_UNBLOCK_SOURCE:
 703         {
 704                 struct group_source_req greqs;
 705                 int omode, add;
 706
 707                 if (optlen < sizeof(struct group_source_req))
 708                         goto e_inval;
 709                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 710                         retv = -EFAULT;
 711                         break;
 712                 }
 713                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 714                     greqs.gsr_source.ss_family != AF_INET6) {
 715                         retv = -EADDRNOTAVAIL;
 716                         break;
 717                 }
 718                 if (optname == MCAST_BLOCK_SOURCE) {
 719                         omode = MCAST_EXCLUDE;
 720                         add = 1;
 721                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 722                         omode = MCAST_EXCLUDE;
 723                         add = 0;
 724                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 725                         struct sockaddr_in6 *psin6;
 726
 727                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 728                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 729                                                  &psin6->sin6_addr);
 730                         /* prior join w/ different source is ok */
 731                         if (retv && retv != -EADDRINUSE)
 732                                 break;
 733                         omode = MCAST_INCLUDE;
 734                         add = 1;
 735                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 736                         omode = MCAST_INCLUDE;
 737                         add = 0;
 738                 }
 739                 retv = ip6_mc_source(add, omode, sk, &greqs);
 740                 break;
 741         }
 742         case MCAST_MSFILTER:
 743         {
 744                 struct group_filter *gsf;
 745
 746                 if (optlen < GROUP_FILTER_SIZE(0))
 747                         goto e_inval;
 748                 if (optlen > sysctl_optmem_max) {
 749                         retv = -ENOBUFS;
 750                         break;
 751                 }
 752                 gsf = kmalloc(optlen, GFP_KERNEL);
 753                 if (!gsf) {
 754                         retv = -ENOBUFS;
 755                         break;
 756                 }
 757                 retv = -EFAULT;
 758                 if (copy_from_user(gsf, optval, optlen)) {
 759                         kfree(gsf);
 760                         break;
 761                 }
 762                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 763                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 764                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 765                         kfree(gsf);
 766                         retv = -ENOBUFS;
 767                         break;
 768                 }
 769                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 770                         kfree(gsf);
 771                         retv = -EINVAL;
 772                         break;
 773                 }
 774                 retv = ip6_mc_msfilter(sk, gsf);
 775                 kfree(gsf);
 776
 777                 break;
 778         }
 779         case IPV6_ROUTER_ALERT:
 780                 if (optlen < sizeof(int))
 781                         goto e_inval;
 782                 retv = ip6_ra_control(sk, val);
 783                 break;
 784         case IPV6_MTU_DISCOVER:
 785                 if (optlen < sizeof(int))
 786                         goto e_inval;
 787                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 788                         goto e_inval;
 789                 np->pmtudisc = val;
 790                 retv = 0;
 791                 break;
 792         case IPV6_MTU:
 793                 if (optlen < sizeof(int))
 794                         goto e_inval;
 795                 if (val && val < IPV6_MIN_MTU)
 796                         goto e_inval;
 797                 np->frag_size = val;
 798                 retv = 0;
 799                 break;
 800         case IPV6_RECVERR:
 801                 if (optlen < sizeof(int))
 802                         goto e_inval;
 803                 np->recverr = valbool;
 804                 if (!val)
 805                         skb_queue_purge(&sk->sk_error_queue);
 806                 retv = 0;
 807                 break;
 808         case IPV6_FLOWINFO_SEND:
 809                 if (optlen < sizeof(int))
 810                         goto e_inval;
 811                 np->sndflow = valbool;
 812                 retv = 0;
 813                 break;
 814         case IPV6_FLOWLABEL_MGR:
 815                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 816                 break;
 817         case IPV6_IPSEC_POLICY:
 818         case IPV6_XFRM_POLICY:
 819                 retv = -EPERM;
 820                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 821                         break;
 822                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 823                 break;
 824
 825         case IPV6_ADDR_PREFERENCES:
 826             {
 827                 unsigned int pref = 0;
 828                 unsigned int prefmask = ~0;
 829
 830                 if (optlen < sizeof(int))
 831                         goto e_inval;
 832
 833                 retv = -EINVAL;
 834
 835                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 836                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 837                                IPV6_PREFER_SRC_TMP|
 838                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 839                 case IPV6_PREFER_SRC_PUBLIC:
 840                         pref |= IPV6_PREFER_SRC_PUBLIC;
 841                         break;
 842                 case IPV6_PREFER_SRC_TMP:
 843                         pref |= IPV6_PREFER_SRC_TMP;
 844                         break;
 845                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 846                         break;
 847                 case 0:
 848                         goto pref_skip_pubtmp;
 849                 default:
 850                         goto e_inval;
 851                 }
 852
 853                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 854                               IPV6_PREFER_SRC_TMP);
 855 pref_skip_pubtmp:
 856
 857                 /* check HOME/COA conflicts */
 858                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 859                 case IPV6_PREFER_SRC_HOME:
 860                         break;
 861                 case IPV6_PREFER_SRC_COA:
 862                         pref |= IPV6_PREFER_SRC_COA;
 863                 case 0:
 864                         goto pref_skip_coa;
 865                 default:
 866                         goto e_inval;
 867                 }
 868
 869                 prefmask &= ~IPV6_PREFER_SRC_COA;
 870 pref_skip_coa:
 871
 872                 /* check CGA/NONCGA conflicts */
 873                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 874                 case IPV6_PREFER_SRC_CGA:
 875                 case IPV6_PREFER_SRC_NONCGA:
 876                 case 0:
 877                         break;
 878                 default:
 879                         goto e_inval;
 880                 }
 881
 882                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 883                 retv = 0;
 884
 885                 break;
 886             }
 887         case IPV6_MINHOPCOUNT:
 888                 if (optlen < sizeof(int))
 889                         goto e_inval;
 890                 if (val < 0 || val > 255)
 891                         goto e_inval;
 892                 np->min_hopcount = val;
 893                 retv = 0;
 894                 break;
 895         case IPV6_DONTFRAG:
 896                 np->dontfrag = valbool;
 897                 retv = 0;
 898                 break;
 899         case IPV6_AUTOFLOWLABEL:
 900                 np->autoflowlabel = valbool;
 901                 np->autoflowlabel_set = 1;
 902                 retv = 0;
 903                 break;
 904         }
 905
 906 unlock:
 907         release_sock(sk);
 908         if (needs_rtnl)
 909                 rtnl_unlock();
 910
 911         return retv;
 912
 913 e_inval:
 914         release_sock(sk);
 915         if (needs_rtnl)
 916                 rtnl_unlock();
 917         return -EINVAL;
 918 }
 919
 920 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 921                     char __user *optval, unsigned int optlen)
 922 {
 923         int err;
 924
 925         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 926                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 927
 928         if (level != SOL_IPV6)
 929                 return -ENOPROTOOPT;
 930
 931         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 932 #ifdef CONFIG_NETFILTER
 933         /* we need to exclude all possible ENOPROTOOPTs except default case */
 934         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 935                         optname != IPV6_XFRM_POLICY)
 936                 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
 937 #endif
 938         return err;
 939 }
 940 EXPORT_SYMBOL(ipv6_setsockopt);
 941
 942 #ifdef CONFIG_COMPAT
 943 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 944                            char __user *optval, unsigned int optlen)
 945 {
 946         int err;
 947
 948         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 949                 if (udp_prot.compat_setsockopt != NULL)
 950                         return udp_prot.compat_setsockopt(sk, level, optname,
 951                                                           optval, optlen);
 952                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 953         }
 954
 955         if (level != SOL_IPV6)
 956                 return -ENOPROTOOPT;
 957
 958         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 959                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 960                         ipv6_setsockopt);
 961
 962         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 963 #ifdef CONFIG_NETFILTER
 964         /* we need to exclude all possible ENOPROTOOPTs except default case */
 965         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 966             optname != IPV6_XFRM_POLICY)
 967                 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
 968                                            optlen);
 969 #endif
 970         return err;
 971 }
 972 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 973 #endif
 974
 975 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 976                                   int optname, char __user *optval, int len)
 977 {
 978         struct ipv6_opt_hdr *hdr;
 979
 980         if (!opt)
 981                 return 0;
 982
 983         switch (optname) {
 984         case IPV6_HOPOPTS:
 985                 hdr = opt->hopopt;
 986                 break;
 987         case IPV6_RTHDRDSTOPTS:
 988                 hdr = opt->dst0opt;
 989                 break;
 990         case IPV6_RTHDR:
 991                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 992                 break;
 993         case IPV6_DSTOPTS:
 994                 hdr = opt->dst1opt;
 995                 break;
 996         default:
 997                 return -EINVAL; /* should not happen */
 998         }
 999
1000         if (!hdr)
1001                 return 0;
1002
1003         len = min_t(unsigned int, len, ipv6_optlen(hdr));
1004         if (copy_to_user(optval, hdr, len))
1005                 return -EFAULT;
1006         return len;
1007 }
1008
1009 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1010                     char __user *optval, int __user *optlen, unsigned int flags)
1011 {
1012         struct ipv6_pinfo *np = inet6_sk(sk);
1013         int len;
1014         int val;
1015
1016         if (ip6_mroute_opt(optname))
1017                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1018
1019         if (get_user(len, optlen))
1020                 return -EFAULT;
1021         switch (optname) {
1022         case IPV6_ADDRFORM:
1023                 if (sk->sk_protocol != IPPROTO_UDP &&
1024                     sk->sk_protocol != IPPROTO_UDPLITE &&
1025                     sk->sk_protocol != IPPROTO_TCP)
1026                         return -ENOPROTOOPT;
1027                 if (sk->sk_state != TCP_ESTABLISHED)
1028                         return -ENOTCONN;
1029                 val = sk->sk_family;
1030                 break;
1031         case MCAST_MSFILTER:
1032         {
1033                 struct group_filter gsf;
1034                 int err;
1035
1036                 if (len < GROUP_FILTER_SIZE(0))
1037                         return -EINVAL;
1038                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1039                         return -EFAULT;
1040                 if (gsf.gf_group.ss_family != AF_INET6)
1041                         return -EADDRNOTAVAIL;
1042                 lock_sock(sk);
1043                 err = ip6_mc_msfget(sk, &gsf,
1044                         (struct group_filter __user *)optval, optlen);
1045                 release_sock(sk);
1046                 return err;
1047         }
1048
1049         case IPV6_2292PKTOPTIONS:
1050         {
1051                 struct msghdr msg;
1052                 struct sk_buff *skb;
1053
1054                 if (sk->sk_type != SOCK_STREAM)
1055                         return -ENOPROTOOPT;
1056
1057                 msg.msg_control = optval;
1058                 msg.msg_controllen = len;
1059                 msg.msg_flags = flags;
1060
1061                 lock_sock(sk);
1062                 skb = np->pktoptions;
1063                 if (skb)
1064                         ip6_datagram_recv_ctl(sk, &msg, skb);
1065                 release_sock(sk);
1066                 if (!skb) {
1067                         if (np->rxopt.bits.rxinfo) {
1068                                 struct in6_pktinfo src_info;
1069                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1070                                         np->sticky_pktinfo.ipi6_ifindex;
1071                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1072                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1073                         }
1074                         if (np->rxopt.bits.rxhlim) {
1075                                 int hlim = np->mcast_hops;
1076                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1077                         }
1078                         if (np->rxopt.bits.rxtclass) {
1079                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1080
1081                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1082                         }
1083                         if (np->rxopt.bits.rxoinfo) {
1084                                 struct in6_pktinfo src_info;
1085                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1086                                         np->sticky_pktinfo.ipi6_ifindex;
1087                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1088                                                                      np->sticky_pktinfo.ipi6_addr;
1089                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1090                         }
1091                         if (np->rxopt.bits.rxohlim) {
1092                                 int hlim = np->mcast_hops;
1093                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1094                         }
1095                         if (np->rxopt.bits.rxflow) {
1096                                 __be32 flowinfo = np->rcv_flowinfo;
1097
1098                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1099                         }
1100                 }
1101                 len -= msg.msg_controllen;
1102                 return put_user(len, optlen);
1103         }
1104         case IPV6_MTU:
1105         {
1106                 struct dst_entry *dst;
1107
1108                 val = 0;
1109                 rcu_read_lock();
1110                 dst = __sk_dst_get(sk);
1111                 if (dst)
1112                         val = dst_mtu(dst);
1113                 rcu_read_unlock();
1114                 if (!val)
1115                         return -ENOTCONN;
1116                 break;
1117         }
1118
1119         case IPV6_V6ONLY:
1120                 val = sk->sk_ipv6only;
1121                 break;
1122
1123         case IPV6_RECVPKTINFO:
1124                 val = np->rxopt.bits.rxinfo;
1125                 break;
1126
1127         case IPV6_2292PKTINFO:
1128                 val = np->rxopt.bits.rxoinfo;
1129                 break;
1130
1131         case IPV6_RECVHOPLIMIT:
1132                 val = np->rxopt.bits.rxhlim;
1133                 break;
1134
1135         case IPV6_2292HOPLIMIT:
1136                 val = np->rxopt.bits.rxohlim;
1137                 break;
1138
1139         case IPV6_RECVRTHDR:
1140                 val = np->rxopt.bits.srcrt;
1141                 break;
1142
1143         case IPV6_2292RTHDR:
1144                 val = np->rxopt.bits.osrcrt;
1145                 break;
1146
1147         case IPV6_HOPOPTS:
1148         case IPV6_RTHDRDSTOPTS:
1149         case IPV6_RTHDR:
1150         case IPV6_DSTOPTS:
1151         {
1152                 struct ipv6_txoptions *opt;
1153
1154                 lock_sock(sk);
1155                 opt = rcu_dereference_protected(np->opt,
1156                                                 lockdep_sock_is_held(sk));
1157                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1158                 release_sock(sk);
1159                 /* check if ipv6_getsockopt_sticky() returns err code */
1160                 if (len < 0)
1161                         return len;
1162                 return put_user(len, optlen);
1163         }
1164
1165         case IPV6_RECVHOPOPTS:
1166                 val = np->rxopt.bits.hopopts;
1167                 break;
1168
1169         case IPV6_2292HOPOPTS:
1170                 val = np->rxopt.bits.ohopopts;
1171                 break;
1172
1173         case IPV6_RECVDSTOPTS:
1174                 val = np->rxopt.bits.dstopts;
1175                 break;
1176
1177         case IPV6_2292DSTOPTS:
1178                 val = np->rxopt.bits.odstopts;
1179                 break;
1180
1181         case IPV6_TCLASS:
1182                 val = np->tclass;
1183                 break;
1184
1185         case IPV6_RECVTCLASS:
1186                 val = np->rxopt.bits.rxtclass;
1187                 break;
1188
1189         case IPV6_FLOWINFO:
1190                 val = np->rxopt.bits.rxflow;
1191                 break;
1192
1193         case IPV6_RECVPATHMTU:
1194                 val = np->rxopt.bits.rxpmtu;
1195                 break;
1196
1197         case IPV6_PATHMTU:
1198         {
1199                 struct dst_entry *dst;
1200                 struct ip6_mtuinfo mtuinfo;
1201
1202                 if (len < sizeof(mtuinfo))
1203                         return -EINVAL;
1204
1205                 len = sizeof(mtuinfo);
1206                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1207
1208                 rcu_read_lock();
1209                 dst = __sk_dst_get(sk);
1210                 if (dst)
1211                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1212                 rcu_read_unlock();
1213                 if (!mtuinfo.ip6m_mtu)
1214                         return -ENOTCONN;
1215
1216                 if (put_user(len, optlen))
1217                         return -EFAULT;
1218                 if (copy_to_user(optval, &mtuinfo, len))
1219                         return -EFAULT;
1220
1221                 return 0;
1222         }
1223
1224         case IPV6_TRANSPARENT:
1225                 val = inet_sk(sk)->transparent;
1226                 break;
1227
1228         case IPV6_RECVORIGDSTADDR:
1229                 val = np->rxopt.bits.rxorigdstaddr;
1230                 break;
1231
1232         case IPV6_UNICAST_HOPS:
1233         case IPV6_MULTICAST_HOPS:
1234         {
1235                 struct dst_entry *dst;
1236
1237                 if (optname == IPV6_UNICAST_HOPS)
1238                         val = np->hop_limit;
1239                 else
1240                         val = np->mcast_hops;
1241
1242                 if (val < 0) {
1243                         rcu_read_lock();
1244                         dst = __sk_dst_get(sk);
1245                         if (dst)
1246                                 val = ip6_dst_hoplimit(dst);
1247                         rcu_read_unlock();
1248                 }
1249
1250                 if (val < 0)
1251                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1252                 break;
1253         }
1254
1255         case IPV6_MULTICAST_LOOP:
1256                 val = np->mc_loop;
1257                 break;
1258
1259         case IPV6_MULTICAST_IF:
1260                 val = np->mcast_oif;
1261                 break;
1262
1263         case IPV6_UNICAST_IF:
1264                 val = (__force int)htonl((__u32) np->ucast_oif);
1265                 break;
1266
1267         case IPV6_MTU_DISCOVER:
1268                 val = np->pmtudisc;
1269                 break;
1270
1271         case IPV6_RECVERR:
1272                 val = np->recverr;
1273                 break;
1274
1275         case IPV6_FLOWINFO_SEND:
1276                 val = np->sndflow;
1277                 break;
1278
1279         case IPV6_FLOWLABEL_MGR:
1280         {
1281                 struct in6_flowlabel_req freq;
1282                 int flags;
1283
1284                 if (len < sizeof(freq))
1285                         return -EINVAL;
1286
1287                 if (copy_from_user(&freq, optval, sizeof(freq)))
1288                         return -EFAULT;
1289
1290                 if (freq.flr_action != IPV6_FL_A_GET)
1291                         return -EINVAL;
1292
1293                 len = sizeof(freq);
1294                 flags = freq.flr_flags;
1295
1296                 memset(&freq, 0, sizeof(freq));
1297
1298                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1299                 if (val < 0)
1300                         return val;
1301
1302                 if (put_user(len, optlen))
1303                         return -EFAULT;
1304                 if (copy_to_user(optval, &freq, len))
1305                         return -EFAULT;
1306
1307                 return 0;
1308         }
1309
1310         case IPV6_ADDR_PREFERENCES:
1311                 val = 0;
1312
1313                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1314                         val |= IPV6_PREFER_SRC_TMP;
1315                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1316                         val |= IPV6_PREFER_SRC_PUBLIC;
1317                 else {
1318                         /* XXX: should we return system default? */
1319                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1320                 }
1321
1322                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1323                         val |= IPV6_PREFER_SRC_COA;
1324                 else
1325                         val |= IPV6_PREFER_SRC_HOME;
1326                 break;
1327
1328         case IPV6_MINHOPCOUNT:
1329                 val = np->min_hopcount;
1330                 break;
1331
1332         case IPV6_DONTFRAG:
1333                 val = np->dontfrag;
1334                 break;
1335
1336         case IPV6_AUTOFLOWLABEL:
1337                 val = ip6_autoflowlabel(sock_net(sk), np);
1338                 break;
1339
1340         default:
1341                 return -ENOPROTOOPT;
1342         }
1343         len = min_t(unsigned int, sizeof(int), len);
1344         if (put_user(len, optlen))
1345                 return -EFAULT;
1346         if (copy_to_user(optval, &val, len))
1347                 return -EFAULT;
1348         return 0;
1349 }
1350
1351 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1352                     char __user *optval, int __user *optlen)
1353 {
1354         int err;
1355
1356         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1357                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1358
1359         if (level != SOL_IPV6)
1360                 return -ENOPROTOOPT;
1361
1362         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1363 #ifdef CONFIG_NETFILTER
1364         /* we need to exclude all possible ENOPROTOOPTs except default case */
1365         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1366                 int len;
1367
1368                 if (get_user(len, optlen))
1369                         return -EFAULT;
1370
1371                 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1372                 if (err >= 0)
1373                         err = put_user(len, optlen);
1374         }
1375 #endif
1376         return err;
1377 }
1378 EXPORT_SYMBOL(ipv6_getsockopt);
1379
1380 #ifdef CONFIG_COMPAT
1381 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1382                            char __user *optval, int __user *optlen)
1383 {
1384         int err;
1385
1386         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1387                 if (udp_prot.compat_getsockopt != NULL)
1388                         return udp_prot.compat_getsockopt(sk, level, optname,
1389                                                           optval, optlen);
1390                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1391         }
1392
1393         if (level != SOL_IPV6)
1394                 return -ENOPROTOOPT;
1395
1396         if (optname == MCAST_MSFILTER)
1397                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1398                         ipv6_getsockopt);
1399
1400         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1401                                  MSG_CMSG_COMPAT);
1402 #ifdef CONFIG_NETFILTER
1403         /* we need to exclude all possible ENOPROTOOPTs except default case */
1404         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1405                 int len;
1406
1407                 if (get_user(len, optlen))
1408                         return -EFAULT;
1409
1410                 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1411                 if (err >= 0)
1412                         err = put_user(len, optlen);
1413         }
1414 #endif
1415         return err;
1416 }
1417 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1418 #endif
1419