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         switch (optname) {
 170
 171         case IPV6_ADDRFORM:
 172                 if (optlen < sizeof(int))
 173                         goto e_inval;
 174                 if (val == PF_INET) {
 175                         struct ipv6_txoptions *opt;
 176                         struct sk_buff *pktopt;
 177
 178                         if (sk->sk_type == SOCK_RAW)
 179                                 break;
 180
 181                         if (sk->sk_protocol == IPPROTO_UDP ||
 182                             sk->sk_protocol == IPPROTO_UDPLITE) {
 183                                 struct udp_sock *up = udp_sk(sk);
 184                                 if (up->pending == AF_INET6) {
 185                                         retv = -EBUSY;
 186                                         break;
 187                                 }
 188                         } else if (sk->sk_protocol == IPPROTO_TCP) {
 189                                 if (sk->sk_prot != &tcpv6_prot) {
 190                                         retv = -EBUSY;
 191                                         break;
 192                                 }
 193                         } else {
 194                                 break;
 195                         }
 196
 197                         if (sk->sk_state != TCP_ESTABLISHED) {
 198                                 retv = -ENOTCONN;
 199                                 break;
 200                         }
 201
 202                         if (ipv6_only_sock(sk) ||
 203                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 204                                 retv = -EADDRNOTAVAIL;
 205                                 break;
 206                         }
 207
 208                         fl6_free_socklist(sk);
 209                         __ipv6_sock_mc_close(sk);
 210                         __ipv6_sock_ac_close(sk);
 211
 212                         /*
 213                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 214                          * remove it from the refcnt debug socks count in the
 215                          * original family...
 216                          */
 217                         sk_refcnt_debug_dec(sk);
 218
 219                         if (sk->sk_protocol == IPPROTO_TCP) {
 220                                 struct inet_connection_sock *icsk = inet_csk(sk);
 221                                 local_bh_disable();
 222                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 223                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 224                                 local_bh_enable();
 225                                 sk->sk_prot = &tcp_prot;
 226                                 icsk->icsk_af_ops = &ipv4_specific;
 227                                 sk->sk_socket->ops = &inet_stream_ops;
 228                                 sk->sk_family = PF_INET;
 229                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 230                         } else {
 231                                 struct proto *prot = &udp_prot;
 232
 233                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 234                                         prot = &udplite_prot;
 235                                 local_bh_disable();
 236                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 237                                 sock_prot_inuse_add(net, prot, 1);
 238                                 local_bh_enable();
 239                                 sk->sk_prot = prot;
 240                                 sk->sk_socket->ops = &inet_dgram_ops;
 241                                 sk->sk_family = PF_INET;
 242                         }
 243                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
 244                                    NULL);
 245                         if (opt) {
 246                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 247                                 txopt_put(opt);
 248                         }
 249                         pktopt = xchg(&np->pktoptions, NULL);
 250                         kfree_skb(pktopt);
 251
 252                         /*
 253                          * ... and add it to the refcnt debug socks count
 254                          * in the new family. -acme
 255                          */
 256                         sk_refcnt_debug_inc(sk);
 257                         module_put(THIS_MODULE);
 258                         retv = 0;
 259                         break;
 260                 }
 261                 goto e_inval;
 262
 263         case IPV6_V6ONLY:
 264                 if (optlen < sizeof(int) ||
 265                     inet_sk(sk)->inet_num)
 266                         goto e_inval;
 267                 sk->sk_ipv6only = valbool;
 268                 retv = 0;
 269                 break;
 270
 271         case IPV6_RECVPKTINFO:
 272                 if (optlen < sizeof(int))
 273                         goto e_inval;
 274                 np->rxopt.bits.rxinfo = valbool;
 275                 retv = 0;
 276                 break;
 277
 278         case IPV6_2292PKTINFO:
 279                 if (optlen < sizeof(int))
 280                         goto e_inval;
 281                 np->rxopt.bits.rxoinfo = valbool;
 282                 retv = 0;
 283                 break;
 284
 285         case IPV6_RECVHOPLIMIT:
 286                 if (optlen < sizeof(int))
 287                         goto e_inval;
 288                 np->rxopt.bits.rxhlim = valbool;
 289                 retv = 0;
 290                 break;
 291
 292         case IPV6_2292HOPLIMIT:
 293                 if (optlen < sizeof(int))
 294                         goto e_inval;
 295                 np->rxopt.bits.rxohlim = valbool;
 296                 retv = 0;
 297                 break;
 298
 299         case IPV6_RECVRTHDR:
 300                 if (optlen < sizeof(int))
 301                         goto e_inval;
 302                 np->rxopt.bits.srcrt = valbool;
 303                 retv = 0;
 304                 break;
 305
 306         case IPV6_2292RTHDR:
 307                 if (optlen < sizeof(int))
 308                         goto e_inval;
 309                 np->rxopt.bits.osrcrt = valbool;
 310                 retv = 0;
 311                 break;
 312
 313         case IPV6_RECVHOPOPTS:
 314                 if (optlen < sizeof(int))
 315                         goto e_inval;
 316                 np->rxopt.bits.hopopts = valbool;
 317                 retv = 0;
 318                 break;
 319
 320         case IPV6_2292HOPOPTS:
 321                 if (optlen < sizeof(int))
 322                         goto e_inval;
 323                 np->rxopt.bits.ohopopts = valbool;
 324                 retv = 0;
 325                 break;
 326
 327         case IPV6_RECVDSTOPTS:
 328                 if (optlen < sizeof(int))
 329                         goto e_inval;
 330                 np->rxopt.bits.dstopts = valbool;
 331                 retv = 0;
 332                 break;
 333
 334         case IPV6_2292DSTOPTS:
 335                 if (optlen < sizeof(int))
 336                         goto e_inval;
 337                 np->rxopt.bits.odstopts = valbool;
 338                 retv = 0;
 339                 break;
 340
 341         case IPV6_TCLASS:
 342                 if (optlen < sizeof(int))
 343                         goto e_inval;
 344                 if (val < -1 || val > 0xff)
 345                         goto e_inval;
 346                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 347                 if (val == -1)
 348                         val = 0;
 349                 np->tclass = val;
 350                 retv = 0;
 351                 break;
 352
 353         case IPV6_RECVTCLASS:
 354                 if (optlen < sizeof(int))
 355                         goto e_inval;
 356                 np->rxopt.bits.rxtclass = valbool;
 357                 retv = 0;
 358                 break;
 359
 360         case IPV6_FLOWINFO:
 361                 if (optlen < sizeof(int))
 362                         goto e_inval;
 363                 np->rxopt.bits.rxflow = valbool;
 364                 retv = 0;
 365                 break;
 366
 367         case IPV6_RECVPATHMTU:
 368                 if (optlen < sizeof(int))
 369                         goto e_inval;
 370                 np->rxopt.bits.rxpmtu = valbool;
 371                 retv = 0;
 372                 break;
 373
 374         case IPV6_TRANSPARENT:
 375                 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 376                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 377                         retv = -EPERM;
 378                         break;
 379                 }
 380                 if (optlen < sizeof(int))
 381                         goto e_inval;
 382                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 383                 inet_sk(sk)->transparent = valbool;
 384                 retv = 0;
 385                 break;
 386
 387         case IPV6_RECVORIGDSTADDR:
 388                 if (optlen < sizeof(int))
 389                         goto e_inval;
 390                 np->rxopt.bits.rxorigdstaddr = valbool;
 391                 retv = 0;
 392                 break;
 393
 394         case IPV6_HOPOPTS:
 395         case IPV6_RTHDRDSTOPTS:
 396         case IPV6_RTHDR:
 397         case IPV6_DSTOPTS:
 398         {
 399                 struct ipv6_txoptions *opt;
 400                 struct ipv6_opt_hdr *new = NULL;
 401
 402                 /* hop-by-hop / destination options are privileged option */
 403                 retv = -EPERM;
 404                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 405                         break;
 406
 407                 /* remove any sticky options header with a zero option
 408                  * length, per RFC3542.
 409                  */
 410                 if (optlen == 0)
 411                         optval = NULL;
 412                 else if (!optval)
 413                         goto e_inval;
 414                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 415                          optlen & 0x7 || optlen > 8 * 255)
 416                         goto e_inval;
 417                 else {
 418                         new = memdup_user(optval, optlen);
 419                         if (IS_ERR(new)) {
 420                                 retv = PTR_ERR(new);
 421                                 break;
 422                         }
 423                         if (unlikely(ipv6_optlen(new) > optlen)) {
 424                                 kfree(new);
 425                                 goto e_inval;
 426                         }
 427                 }
 428
 429                 opt = rcu_dereference_protected(np->opt,
 430                                                 lockdep_sock_is_held(sk));
 431                 opt = ipv6_renew_options(sk, opt, optname, new);
 432                 kfree(new);
 433                 if (IS_ERR(opt)) {
 434                         retv = PTR_ERR(opt);
 435                         break;
 436                 }
 437
 438                 /* routing header option needs extra check */
 439                 retv = -EINVAL;
 440                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 441                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 442                         switch (rthdr->type) {
 443 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 444                         case IPV6_SRCRT_TYPE_2:
 445                                 if (rthdr->hdrlen != 2 ||
 446                                     rthdr->segments_left != 1)
 447                                         goto sticky_done;
 448
 449                                 break;
 450 #endif
 451                         case IPV6_SRCRT_TYPE_4:
 452                         {
 453                                 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
 454                                                           opt->srcrt;
 455
 456                                 if (!seg6_validate_srh(srh, optlen))
 457                                         goto sticky_done;
 458                                 break;
 459                         }
 460                         default:
 461                                 goto sticky_done;
 462                         }
 463                 }
 464
 465                 retv = 0;
 466                 opt = ipv6_update_options(sk, opt);
 467 sticky_done:
 468                 if (opt) {
 469                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 470                         txopt_put(opt);
 471                 }
 472                 break;
 473         }
 474
 475         case IPV6_PKTINFO:
 476         {
 477                 struct in6_pktinfo pkt;
 478
 479                 if (optlen == 0)
 480                         goto e_inval;
 481                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 482                         goto e_inval;
 483
 484                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 485                                 retv = -EFAULT;
 486                                 break;
 487                 }
 488                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 489                         goto e_inval;
 490
 491                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 492                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 493                 retv = 0;
 494                 break;
 495         }
 496
 497         case IPV6_2292PKTOPTIONS:
 498         {
 499                 struct ipv6_txoptions *opt = NULL;
 500                 struct msghdr msg;
 501                 struct flowi6 fl6;
 502                 struct sockcm_cookie sockc_junk;
 503                 struct ipcm6_cookie ipc6;
 504
 505                 memset(&fl6, 0, sizeof(fl6));
 506                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 507                 fl6.flowi6_mark = sk->sk_mark;
 508
 509                 if (optlen == 0)
 510                         goto update;
 511
 512                 /* 1K is probably excessive
 513                  * 1K is surely not enough, 2K per standard header is 16K.
 514                  */
 515                 retv = -EINVAL;
 516                 if (optlen > 64*1024)
 517                         break;
 518
 519                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 520                 retv = -ENOBUFS;
 521                 if (!opt)
 522                         break;
 523
 524                 memset(opt, 0, sizeof(*opt));
 525                 refcount_set(&opt->refcnt, 1);
 526                 opt->tot_len = sizeof(*opt) + optlen;
 527                 retv = -EFAULT;
 528                 if (copy_from_user(opt+1, optval, optlen))
 529                         goto done;
 530
 531                 msg.msg_controllen = optlen;
 532                 msg.msg_control = (void *)(opt+1);
 533                 ipc6.opt = opt;
 534
 535                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
 536                 if (retv)
 537                         goto done;
 538 update:
 539                 retv = 0;
 540                 opt = ipv6_update_options(sk, opt);
 541 done:
 542                 if (opt) {
 543                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 544                         txopt_put(opt);
 545                 }
 546                 break;
 547         }
 548         case IPV6_UNICAST_HOPS:
 549                 if (optlen < sizeof(int))
 550                         goto e_inval;
 551                 if (val > 255 || val < -1)
 552                         goto e_inval;
 553                 np->hop_limit = val;
 554                 retv = 0;
 555                 break;
 556
 557         case IPV6_MULTICAST_HOPS:
 558                 if (sk->sk_type == SOCK_STREAM)
 559                         break;
 560                 if (optlen < sizeof(int))
 561                         goto e_inval;
 562                 if (val > 255 || val < -1)
 563                         goto e_inval;
 564                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 565                 retv = 0;
 566                 break;
 567
 568         case IPV6_MULTICAST_LOOP:
 569                 if (optlen < sizeof(int))
 570                         goto e_inval;
 571                 if (val != valbool)
 572                         goto e_inval;
 573                 np->mc_loop = valbool;
 574                 retv = 0;
 575                 break;
 576
 577         case IPV6_UNICAST_IF:
 578         {
 579                 struct net_device *dev = NULL;
 580                 int ifindex;
 581
 582                 if (optlen != sizeof(int))
 583                         goto e_inval;
 584
 585                 ifindex = (__force int)ntohl((__force __be32)val);
 586                 if (ifindex == 0) {
 587                         np->ucast_oif = 0;
 588                         retv = 0;
 589                         break;
 590                 }
 591
 592                 dev = dev_get_by_index(net, ifindex);
 593                 retv = -EADDRNOTAVAIL;
 594                 if (!dev)
 595                         break;
 596                 dev_put(dev);
 597
 598                 retv = -EINVAL;
 599                 if (sk->sk_bound_dev_if)
 600                         break;
 601
 602                 np->ucast_oif = ifindex;
 603                 retv = 0;
 604                 break;
 605         }
 606
 607         case IPV6_MULTICAST_IF:
 608                 if (sk->sk_type == SOCK_STREAM)
 609                         break;
 610                 if (optlen < sizeof(int))
 611                         goto e_inval;
 612
 613                 if (val) {
 614                         struct net_device *dev;
 615                         int midx;
 616
 617                         rcu_read_lock();
 618
 619                         dev = dev_get_by_index_rcu(net, val);
 620                         if (!dev) {
 621                                 rcu_read_unlock();
 622                                 retv = -ENODEV;
 623                                 break;
 624                         }
 625                         midx = l3mdev_master_ifindex_rcu(dev);
 626
 627                         rcu_read_unlock();
 628
 629                         if (sk->sk_bound_dev_if &&
 630                             sk->sk_bound_dev_if != val &&
 631                             (!midx || midx != sk->sk_bound_dev_if))
 632                                 goto e_inval;
 633                 }
 634                 np->mcast_oif = val;
 635                 retv = 0;
 636                 break;
 637         case IPV6_ADD_MEMBERSHIP:
 638         case IPV6_DROP_MEMBERSHIP:
 639         {
 640                 struct ipv6_mreq mreq;
 641
 642                 if (optlen < sizeof(struct ipv6_mreq))
 643                         goto e_inval;
 644
 645                 retv = -EPROTO;
 646                 if (inet_sk(sk)->is_icsk)
 647                         break;
 648
 649                 retv = -EFAULT;
 650                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 651                         break;
 652
 653                 if (optname == IPV6_ADD_MEMBERSHIP)
 654                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 655                 else
 656                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 657                 break;
 658         }
 659         case IPV6_JOIN_ANYCAST:
 660         case IPV6_LEAVE_ANYCAST:
 661         {
 662                 struct ipv6_mreq mreq;
 663
 664                 if (optlen < sizeof(struct ipv6_mreq))
 665                         goto e_inval;
 666
 667                 retv = -EFAULT;
 668                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 669                         break;
 670
 671                 if (optname == IPV6_JOIN_ANYCAST)
 672                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 673                 else
 674                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 675                 break;
 676         }
 677         case MCAST_JOIN_GROUP:
 678         case MCAST_LEAVE_GROUP:
 679         {
 680                 struct group_req greq;
 681                 struct sockaddr_in6 *psin6;
 682
 683                 if (optlen < sizeof(struct group_req))
 684                         goto e_inval;
 685
 686                 retv = -EFAULT;
 687                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 688                         break;
 689                 if (greq.gr_group.ss_family != AF_INET6) {
 690                         retv = -EADDRNOTAVAIL;
 691                         break;
 692                 }
 693                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 694                 if (optname == MCAST_JOIN_GROUP)
 695                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 696                                                  &psin6->sin6_addr);
 697                 else
 698                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 699                                                  &psin6->sin6_addr);
 700                 break;
 701         }
 702         case MCAST_JOIN_SOURCE_GROUP:
 703         case MCAST_LEAVE_SOURCE_GROUP:
 704         case MCAST_BLOCK_SOURCE:
 705         case MCAST_UNBLOCK_SOURCE:
 706         {
 707                 struct group_source_req greqs;
 708                 int omode, add;
 709
 710                 if (optlen < sizeof(struct group_source_req))
 711                         goto e_inval;
 712                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 713                         retv = -EFAULT;
 714                         break;
 715                 }
 716                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 717                     greqs.gsr_source.ss_family != AF_INET6) {
 718                         retv = -EADDRNOTAVAIL;
 719                         break;
 720                 }
 721                 if (optname == MCAST_BLOCK_SOURCE) {
 722                         omode = MCAST_EXCLUDE;
 723                         add = 1;
 724                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 725                         omode = MCAST_EXCLUDE;
 726                         add = 0;
 727                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 728                         struct sockaddr_in6 *psin6;
 729
 730                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 731                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 732                                                  &psin6->sin6_addr);
 733                         /* prior join w/ different source is ok */
 734                         if (retv && retv != -EADDRINUSE)
 735                                 break;
 736                         omode = MCAST_INCLUDE;
 737                         add = 1;
 738                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 739                         omode = MCAST_INCLUDE;
 740                         add = 0;
 741                 }
 742                 retv = ip6_mc_source(add, omode, sk, &greqs);
 743                 break;
 744         }
 745         case MCAST_MSFILTER:
 746         {
 747                 struct group_filter *gsf;
 748
 749                 if (optlen < GROUP_FILTER_SIZE(0))
 750                         goto e_inval;
 751                 if (optlen > sysctl_optmem_max) {
 752                         retv = -ENOBUFS;
 753                         break;
 754                 }
 755                 gsf = memdup_user(optval, optlen);
 756                 if (IS_ERR(gsf)) {
 757                         retv = PTR_ERR(gsf);
 758                         break;
 759                 }
 760                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 761                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 762                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 763                         kfree(gsf);
 764                         retv = -ENOBUFS;
 765                         break;
 766                 }
 767                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 768                         kfree(gsf);
 769                         retv = -EINVAL;
 770                         break;
 771                 }
 772                 retv = ip6_mc_msfilter(sk, gsf);
 773                 kfree(gsf);
 774
 775                 break;
 776         }
 777         case IPV6_ROUTER_ALERT:
 778                 if (optlen < sizeof(int))
 779                         goto e_inval;
 780                 retv = ip6_ra_control(sk, val);
 781                 break;
 782         case IPV6_MTU_DISCOVER:
 783                 if (optlen < sizeof(int))
 784                         goto e_inval;
 785                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 786                         goto e_inval;
 787                 np->pmtudisc = val;
 788                 retv = 0;
 789                 break;
 790         case IPV6_MTU:
 791                 if (optlen < sizeof(int))
 792                         goto e_inval;
 793                 if (val && val < IPV6_MIN_MTU)
 794                         goto e_inval;
 795                 np->frag_size = val;
 796                 retv = 0;
 797                 break;
 798         case IPV6_RECVERR:
 799                 if (optlen < sizeof(int))
 800                         goto e_inval;
 801                 np->recverr = valbool;
 802                 if (!val)
 803                         skb_queue_purge(&sk->sk_error_queue);
 804                 retv = 0;
 805                 break;
 806         case IPV6_FLOWINFO_SEND:
 807                 if (optlen < sizeof(int))
 808                         goto e_inval;
 809                 np->sndflow = valbool;
 810                 retv = 0;
 811                 break;
 812         case IPV6_FLOWLABEL_MGR:
 813                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 814                 break;
 815         case IPV6_IPSEC_POLICY:
 816         case IPV6_XFRM_POLICY:
 817                 retv = -EPERM;
 818                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 819                         break;
 820                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 821                 break;
 822
 823         case IPV6_ADDR_PREFERENCES:
 824             {
 825                 unsigned int pref = 0;
 826                 unsigned int prefmask = ~0;
 827
 828                 if (optlen < sizeof(int))
 829                         goto e_inval;
 830
 831                 retv = -EINVAL;
 832
 833                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 834                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 835                                IPV6_PREFER_SRC_TMP|
 836                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 837                 case IPV6_PREFER_SRC_PUBLIC:
 838                         pref |= IPV6_PREFER_SRC_PUBLIC;
 839                         break;
 840                 case IPV6_PREFER_SRC_TMP:
 841                         pref |= IPV6_PREFER_SRC_TMP;
 842                         break;
 843                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 844                         break;
 845                 case 0:
 846                         goto pref_skip_pubtmp;
 847                 default:
 848                         goto e_inval;
 849                 }
 850
 851                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 852                               IPV6_PREFER_SRC_TMP);
 853 pref_skip_pubtmp:
 854
 855                 /* check HOME/COA conflicts */
 856                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 857                 case IPV6_PREFER_SRC_HOME:
 858                         break;
 859                 case IPV6_PREFER_SRC_COA:
 860                         pref |= IPV6_PREFER_SRC_COA;
 861                 case 0:
 862                         goto pref_skip_coa;
 863                 default:
 864                         goto e_inval;
 865                 }
 866
 867                 prefmask &= ~IPV6_PREFER_SRC_COA;
 868 pref_skip_coa:
 869
 870                 /* check CGA/NONCGA conflicts */
 871                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 872                 case IPV6_PREFER_SRC_CGA:
 873                 case IPV6_PREFER_SRC_NONCGA:
 874                 case 0:
 875                         break;
 876                 default:
 877                         goto e_inval;
 878                 }
 879
 880                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 881                 retv = 0;
 882
 883                 break;
 884             }
 885         case IPV6_MINHOPCOUNT:
 886                 if (optlen < sizeof(int))
 887                         goto e_inval;
 888                 if (val < 0 || val > 255)
 889                         goto e_inval;
 890                 np->min_hopcount = val;
 891                 retv = 0;
 892                 break;
 893         case IPV6_DONTFRAG:
 894                 np->dontfrag = valbool;
 895                 retv = 0;
 896                 break;
 897         case IPV6_AUTOFLOWLABEL:
 898                 np->autoflowlabel = valbool;
 899                 np->autoflowlabel_set = 1;
 900                 retv = 0;
 901                 break;
 902         case IPV6_RECVFRAGSIZE:
 903                 np->rxopt.bits.recvfragsize = valbool;
 904                 retv = 0;
 905                 break;
 906         }
 907
 908         release_sock(sk);
 909         if (needs_rtnl)
 910                 rtnl_unlock();
 911
 912         return retv;
 913
 914 e_inval:
 915         release_sock(sk);
 916         if (needs_rtnl)
 917                 rtnl_unlock();
 918         return -EINVAL;
 919 }
 920
 921 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 922                     char __user *optval, unsigned int optlen)
 923 {
 924         int err;
 925
 926         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 927                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 928
 929         if (level != SOL_IPV6)
 930                 return -ENOPROTOOPT;
 931
 932         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 933 #ifdef CONFIG_NETFILTER
 934         /* we need to exclude all possible ENOPROTOOPTs except default case */
 935         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 936                         optname != IPV6_XFRM_POLICY)
 937                 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
 938 #endif
 939         return err;
 940 }
 941 EXPORT_SYMBOL(ipv6_setsockopt);
 942
 943 #ifdef CONFIG_COMPAT
 944 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 945                            char __user *optval, unsigned int optlen)
 946 {
 947         int err;
 948
 949         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 950                 if (udp_prot.compat_setsockopt != NULL)
 951                         return udp_prot.compat_setsockopt(sk, level, optname,
 952                                                           optval, optlen);
 953                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 954         }
 955
 956         if (level != SOL_IPV6)
 957                 return -ENOPROTOOPT;
 958
 959         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 960                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 961                         ipv6_setsockopt);
 962
 963         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 964 #ifdef CONFIG_NETFILTER
 965         /* we need to exclude all possible ENOPROTOOPTs except default case */
 966         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 967             optname != IPV6_XFRM_POLICY)
 968                 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
 969                                            optlen);
 970 #endif
 971         return err;
 972 }
 973 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 974 #endif
 975
 976 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 977                                   int optname, char __user *optval, int len)
 978 {
 979         struct ipv6_opt_hdr *hdr;
 980
 981         if (!opt)
 982                 return 0;
 983
 984         switch (optname) {
 985         case IPV6_HOPOPTS:
 986                 hdr = opt->hopopt;
 987                 break;
 988         case IPV6_RTHDRDSTOPTS:
 989                 hdr = opt->dst0opt;
 990                 break;
 991         case IPV6_RTHDR:
 992                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 993                 break;
 994         case IPV6_DSTOPTS:
 995                 hdr = opt->dst1opt;
 996                 break;
 997         default:
 998                 return -EINVAL; /* should not happen */
 999         }
1000
1001         if (!hdr)
1002                 return 0;
1003
1004         len = min_t(unsigned int, len, ipv6_optlen(hdr));
1005         if (copy_to_user(optval, hdr, len))
1006                 return -EFAULT;
1007         return len;
1008 }
1009
1010 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1011                     char __user *optval, int __user *optlen, unsigned int flags)
1012 {
1013         struct ipv6_pinfo *np = inet6_sk(sk);
1014         int len;
1015         int val;
1016
1017         if (ip6_mroute_opt(optname))
1018                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1019
1020         if (get_user(len, optlen))
1021                 return -EFAULT;
1022         switch (optname) {
1023         case IPV6_ADDRFORM:
1024                 if (sk->sk_protocol != IPPROTO_UDP &&
1025                     sk->sk_protocol != IPPROTO_UDPLITE &&
1026                     sk->sk_protocol != IPPROTO_TCP)
1027                         return -ENOPROTOOPT;
1028                 if (sk->sk_state != TCP_ESTABLISHED)
1029                         return -ENOTCONN;
1030                 val = sk->sk_family;
1031                 break;
1032         case MCAST_MSFILTER:
1033         {
1034                 struct group_filter gsf;
1035                 int err;
1036
1037                 if (len < GROUP_FILTER_SIZE(0))
1038                         return -EINVAL;
1039                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1040                         return -EFAULT;
1041                 if (gsf.gf_group.ss_family != AF_INET6)
1042                         return -EADDRNOTAVAIL;
1043                 lock_sock(sk);
1044                 err = ip6_mc_msfget(sk, &gsf,
1045                         (struct group_filter __user *)optval, optlen);
1046                 release_sock(sk);
1047                 return err;
1048         }
1049
1050         case IPV6_2292PKTOPTIONS:
1051         {
1052                 struct msghdr msg;
1053                 struct sk_buff *skb;
1054
1055                 if (sk->sk_type != SOCK_STREAM)
1056                         return -ENOPROTOOPT;
1057
1058                 msg.msg_control = optval;
1059                 msg.msg_controllen = len;
1060                 msg.msg_flags = flags;
1061
1062                 lock_sock(sk);
1063                 skb = np->pktoptions;
1064                 if (skb)
1065                         ip6_datagram_recv_ctl(sk, &msg, skb);
1066                 release_sock(sk);
1067                 if (!skb) {
1068                         if (np->rxopt.bits.rxinfo) {
1069                                 struct in6_pktinfo src_info;
1070                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1071                                         np->sticky_pktinfo.ipi6_ifindex;
1072                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1073                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1074                         }
1075                         if (np->rxopt.bits.rxhlim) {
1076                                 int hlim = np->mcast_hops;
1077                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1078                         }
1079                         if (np->rxopt.bits.rxtclass) {
1080                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1081
1082                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1083                         }
1084                         if (np->rxopt.bits.rxoinfo) {
1085                                 struct in6_pktinfo src_info;
1086                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1087                                         np->sticky_pktinfo.ipi6_ifindex;
1088                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1089                                                                      np->sticky_pktinfo.ipi6_addr;
1090                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1091                         }
1092                         if (np->rxopt.bits.rxohlim) {
1093                                 int hlim = np->mcast_hops;
1094                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1095                         }
1096                         if (np->rxopt.bits.rxflow) {
1097                                 __be32 flowinfo = np->rcv_flowinfo;
1098
1099                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1100                         }
1101                 }
1102                 len -= msg.msg_controllen;
1103                 return put_user(len, optlen);
1104         }
1105         case IPV6_MTU:
1106         {
1107                 struct dst_entry *dst;
1108
1109                 val = 0;
1110                 rcu_read_lock();
1111                 dst = __sk_dst_get(sk);
1112                 if (dst)
1113                         val = dst_mtu(dst);
1114                 rcu_read_unlock();
1115                 if (!val)
1116                         return -ENOTCONN;
1117                 break;
1118         }
1119
1120         case IPV6_V6ONLY:
1121                 val = sk->sk_ipv6only;
1122                 break;
1123
1124         case IPV6_RECVPKTINFO:
1125                 val = np->rxopt.bits.rxinfo;
1126                 break;
1127
1128         case IPV6_2292PKTINFO:
1129                 val = np->rxopt.bits.rxoinfo;
1130                 break;
1131
1132         case IPV6_RECVHOPLIMIT:
1133                 val = np->rxopt.bits.rxhlim;
1134                 break;
1135
1136         case IPV6_2292HOPLIMIT:
1137                 val = np->rxopt.bits.rxohlim;
1138                 break;
1139
1140         case IPV6_RECVRTHDR:
1141                 val = np->rxopt.bits.srcrt;
1142                 break;
1143
1144         case IPV6_2292RTHDR:
1145                 val = np->rxopt.bits.osrcrt;
1146                 break;
1147
1148         case IPV6_HOPOPTS:
1149         case IPV6_RTHDRDSTOPTS:
1150         case IPV6_RTHDR:
1151         case IPV6_DSTOPTS:
1152         {
1153                 struct ipv6_txoptions *opt;
1154
1155                 lock_sock(sk);
1156                 opt = rcu_dereference_protected(np->opt,
1157                                                 lockdep_sock_is_held(sk));
1158                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1159                 release_sock(sk);
1160                 /* check if ipv6_getsockopt_sticky() returns err code */
1161                 if (len < 0)
1162                         return len;
1163                 return put_user(len, optlen);
1164         }
1165
1166         case IPV6_RECVHOPOPTS:
1167                 val = np->rxopt.bits.hopopts;
1168                 break;
1169
1170         case IPV6_2292HOPOPTS:
1171                 val = np->rxopt.bits.ohopopts;
1172                 break;
1173
1174         case IPV6_RECVDSTOPTS:
1175                 val = np->rxopt.bits.dstopts;
1176                 break;
1177
1178         case IPV6_2292DSTOPTS:
1179                 val = np->rxopt.bits.odstopts;
1180                 break;
1181
1182         case IPV6_TCLASS:
1183                 val = np->tclass;
1184                 break;
1185
1186         case IPV6_RECVTCLASS:
1187                 val = np->rxopt.bits.rxtclass;
1188                 break;
1189
1190         case IPV6_FLOWINFO:
1191                 val = np->rxopt.bits.rxflow;
1192                 break;
1193
1194         case IPV6_RECVPATHMTU:
1195                 val = np->rxopt.bits.rxpmtu;
1196                 break;
1197
1198         case IPV6_PATHMTU:
1199         {
1200                 struct dst_entry *dst;
1201                 struct ip6_mtuinfo mtuinfo;
1202
1203                 if (len < sizeof(mtuinfo))
1204                         return -EINVAL;
1205
1206                 len = sizeof(mtuinfo);
1207                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1208
1209                 rcu_read_lock();
1210                 dst = __sk_dst_get(sk);
1211                 if (dst)
1212                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1213                 rcu_read_unlock();
1214                 if (!mtuinfo.ip6m_mtu)
1215                         return -ENOTCONN;
1216
1217                 if (put_user(len, optlen))
1218                         return -EFAULT;
1219                 if (copy_to_user(optval, &mtuinfo, len))
1220                         return -EFAULT;
1221
1222                 return 0;
1223         }
1224
1225         case IPV6_TRANSPARENT:
1226                 val = inet_sk(sk)->transparent;
1227                 break;
1228
1229         case IPV6_RECVORIGDSTADDR:
1230                 val = np->rxopt.bits.rxorigdstaddr;
1231                 break;
1232
1233         case IPV6_UNICAST_HOPS:
1234         case IPV6_MULTICAST_HOPS:
1235         {
1236                 struct dst_entry *dst;
1237
1238                 if (optname == IPV6_UNICAST_HOPS)
1239                         val = np->hop_limit;
1240                 else
1241                         val = np->mcast_hops;
1242
1243                 if (val < 0) {
1244                         rcu_read_lock();
1245                         dst = __sk_dst_get(sk);
1246                         if (dst)
1247                                 val = ip6_dst_hoplimit(dst);
1248                         rcu_read_unlock();
1249                 }
1250
1251                 if (val < 0)
1252                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1253                 break;
1254         }
1255
1256         case IPV6_MULTICAST_LOOP:
1257                 val = np->mc_loop;
1258                 break;
1259
1260         case IPV6_MULTICAST_IF:
1261                 val = np->mcast_oif;
1262                 break;
1263
1264         case IPV6_UNICAST_IF:
1265                 val = (__force int)htonl((__u32) np->ucast_oif);
1266                 break;
1267
1268         case IPV6_MTU_DISCOVER:
1269                 val = np->pmtudisc;
1270                 break;
1271
1272         case IPV6_RECVERR:
1273                 val = np->recverr;
1274                 break;
1275
1276         case IPV6_FLOWINFO_SEND:
1277                 val = np->sndflow;
1278                 break;
1279
1280         case IPV6_FLOWLABEL_MGR:
1281         {
1282                 struct in6_flowlabel_req freq;
1283                 int flags;
1284
1285                 if (len < sizeof(freq))
1286                         return -EINVAL;
1287
1288                 if (copy_from_user(&freq, optval, sizeof(freq)))
1289                         return -EFAULT;
1290
1291                 if (freq.flr_action != IPV6_FL_A_GET)
1292                         return -EINVAL;
1293
1294                 len = sizeof(freq);
1295                 flags = freq.flr_flags;
1296
1297                 memset(&freq, 0, sizeof(freq));
1298
1299                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1300                 if (val < 0)
1301                         return val;
1302
1303                 if (put_user(len, optlen))
1304                         return -EFAULT;
1305                 if (copy_to_user(optval, &freq, len))
1306                         return -EFAULT;
1307
1308                 return 0;
1309         }
1310
1311         case IPV6_ADDR_PREFERENCES:
1312                 val = 0;
1313
1314                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1315                         val |= IPV6_PREFER_SRC_TMP;
1316                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1317                         val |= IPV6_PREFER_SRC_PUBLIC;
1318                 else {
1319                         /* XXX: should we return system default? */
1320                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1321                 }
1322
1323                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1324                         val |= IPV6_PREFER_SRC_COA;
1325                 else
1326                         val |= IPV6_PREFER_SRC_HOME;
1327                 break;
1328
1329         case IPV6_MINHOPCOUNT:
1330                 val = np->min_hopcount;
1331                 break;
1332
1333         case IPV6_DONTFRAG:
1334                 val = np->dontfrag;
1335                 break;
1336
1337         case IPV6_AUTOFLOWLABEL:
1338                 val = ip6_autoflowlabel(sock_net(sk), np);
1339                 break;
1340
1341         case IPV6_RECVFRAGSIZE:
1342                 val = np->rxopt.bits.recvfragsize;
1343                 break;
1344
1345         default:
1346                 return -ENOPROTOOPT;
1347         }
1348         len = min_t(unsigned int, sizeof(int), len);
1349         if (put_user(len, optlen))
1350                 return -EFAULT;
1351         if (copy_to_user(optval, &val, len))
1352                 return -EFAULT;
1353         return 0;
1354 }
1355
1356 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1357                     char __user *optval, int __user *optlen)
1358 {
1359         int err;
1360
1361         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1362                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1363
1364         if (level != SOL_IPV6)
1365                 return -ENOPROTOOPT;
1366
1367         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1368 #ifdef CONFIG_NETFILTER
1369         /* we need to exclude all possible ENOPROTOOPTs except default case */
1370         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1371                 int len;
1372
1373                 if (get_user(len, optlen))
1374                         return -EFAULT;
1375
1376                 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1377                 if (err >= 0)
1378                         err = put_user(len, optlen);
1379         }
1380 #endif
1381         return err;
1382 }
1383 EXPORT_SYMBOL(ipv6_getsockopt);
1384
1385 #ifdef CONFIG_COMPAT
1386 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1387                            char __user *optval, int __user *optlen)
1388 {
1389         int err;
1390
1391         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1392                 if (udp_prot.compat_getsockopt != NULL)
1393                         return udp_prot.compat_getsockopt(sk, level, optname,
1394                                                           optval, optlen);
1395                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1396         }
1397
1398         if (level != SOL_IPV6)
1399                 return -ENOPROTOOPT;
1400
1401         if (optname == MCAST_MSFILTER)
1402                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1403                         ipv6_getsockopt);
1404
1405         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1406                                  MSG_CMSG_COMPAT);
1407 #ifdef CONFIG_NETFILTER
1408         /* we need to exclude all possible ENOPROTOOPTs except default case */
1409         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1410                 int len;
1411
1412                 if (get_user(len, optlen))
1413                         return -EFAULT;
1414
1415                 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1416                 if (err >= 0)
1417                         err = put_user(len, optlen);
1418         }
1419 #endif
1420         return err;
1421 }
1422 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1423 #endif
1424