net/ipv6/ipv6_sockglue.c

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