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                         struct ipv6_txoptions *opt;
 182                         struct sk_buff *pktopt;
 183
 184                         if (sk->sk_type == SOCK_RAW)
 185                                 break;
 186
 187                         if (sk->sk_protocol == IPPROTO_UDP ||
 188                             sk->sk_protocol == IPPROTO_UDPLITE) {
 189                                 struct udp_sock *up = udp_sk(sk);
 190                                 if (up->pending == AF_INET6) {
 191                                         retv = -EBUSY;
 192                                         break;
 193                                 }
 194                         } else if (sk->sk_protocol == IPPROTO_TCP) {
 195                                 if (sk->sk_prot != &tcpv6_prot) {
 196                                         retv = -EBUSY;
 197                                         break;
 198                                 }
 199                         } else {
 200                                 break;
 201                         }
 202
 203                         if (sk->sk_state != TCP_ESTABLISHED) {
 204                                 retv = -ENOTCONN;
 205                                 break;
 206                         }
 207
 208                         if (ipv6_only_sock(sk) ||
 209                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 210                                 retv = -EADDRNOTAVAIL;
 211                                 break;
 212                         }
 213
 214                         fl6_free_socklist(sk);
 215                         __ipv6_sock_mc_close(sk);
 216                         __ipv6_sock_ac_close(sk);
 217
 218                         /*
 219                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 220                          * remove it from the refcnt debug socks count in the
 221                          * original family...
 222                          */
 223                         sk_refcnt_debug_dec(sk);
 224
 225                         if (sk->sk_protocol == IPPROTO_TCP) {
 226                                 struct inet_connection_sock *icsk = inet_csk(sk);
 227                                 local_bh_disable();
 228                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 229                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 230                                 local_bh_enable();
 231                                 sk->sk_prot = &tcp_prot;
 232                                 icsk->icsk_af_ops = &ipv4_specific;
 233                                 sk->sk_socket->ops = &inet_stream_ops;
 234                                 sk->sk_family = PF_INET;
 235                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 236                         } else {
 237                                 struct proto *prot = &udp_prot;
 238
 239                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 240                                         prot = &udplite_prot;
 241                                 local_bh_disable();
 242                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 243                                 sock_prot_inuse_add(net, prot, 1);
 244                                 local_bh_enable();
 245                                 sk->sk_prot = prot;
 246                                 sk->sk_socket->ops = &inet_dgram_ops;
 247                                 sk->sk_family = PF_INET;
 248                         }
 249                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
 250                                    NULL);
 251                         if (opt) {
 252                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 253                                 txopt_put(opt);
 254                         }
 255                         pktopt = xchg(&np->pktoptions, NULL);
 256                         kfree_skb(pktopt);
 257
 258                         /*
 259                          * ... and add it to the refcnt debug socks count
 260                          * in the new family. -acme
 261                          */
 262                         sk_refcnt_debug_inc(sk);
 263                         module_put(THIS_MODULE);
 264                         retv = 0;
 265                         break;
 266                 }
 267                 goto e_inval;
 268
 269         case IPV6_V6ONLY:
 270                 if (optlen < sizeof(int) ||
 271                     inet_sk(sk)->inet_num)
 272                         goto e_inval;
 273                 sk->sk_ipv6only = valbool;
 274                 retv = 0;
 275                 break;
 276
 277         case IPV6_RECVPKTINFO:
 278                 if (optlen < sizeof(int))
 279                         goto e_inval;
 280                 np->rxopt.bits.rxinfo = valbool;
 281                 retv = 0;
 282                 break;
 283
 284         case IPV6_2292PKTINFO:
 285                 if (optlen < sizeof(int))
 286                         goto e_inval;
 287                 np->rxopt.bits.rxoinfo = valbool;
 288                 retv = 0;
 289                 break;
 290
 291         case IPV6_RECVHOPLIMIT:
 292                 if (optlen < sizeof(int))
 293                         goto e_inval;
 294                 np->rxopt.bits.rxhlim = valbool;
 295                 retv = 0;
 296                 break;
 297
 298         case IPV6_2292HOPLIMIT:
 299                 if (optlen < sizeof(int))
 300                         goto e_inval;
 301                 np->rxopt.bits.rxohlim = valbool;
 302                 retv = 0;
 303                 break;
 304
 305         case IPV6_RECVRTHDR:
 306                 if (optlen < sizeof(int))
 307                         goto e_inval;
 308                 np->rxopt.bits.srcrt = valbool;
 309                 retv = 0;
 310                 break;
 311
 312         case IPV6_2292RTHDR:
 313                 if (optlen < sizeof(int))
 314                         goto e_inval;
 315                 np->rxopt.bits.osrcrt = valbool;
 316                 retv = 0;
 317                 break;
 318
 319         case IPV6_RECVHOPOPTS:
 320                 if (optlen < sizeof(int))
 321                         goto e_inval;
 322                 np->rxopt.bits.hopopts = valbool;
 323                 retv = 0;
 324                 break;
 325
 326         case IPV6_2292HOPOPTS:
 327                 if (optlen < sizeof(int))
 328                         goto e_inval;
 329                 np->rxopt.bits.ohopopts = valbool;
 330                 retv = 0;
 331                 break;
 332
 333         case IPV6_RECVDSTOPTS:
 334                 if (optlen < sizeof(int))
 335                         goto e_inval;
 336                 np->rxopt.bits.dstopts = valbool;
 337                 retv = 0;
 338                 break;
 339
 340         case IPV6_2292DSTOPTS:
 341                 if (optlen < sizeof(int))
 342                         goto e_inval;
 343                 np->rxopt.bits.odstopts = valbool;
 344                 retv = 0;
 345                 break;
 346
 347         case IPV6_TCLASS:
 348                 if (optlen < sizeof(int))
 349                         goto e_inval;
 350                 if (val < -1 || val > 0xff)
 351                         goto e_inval;
 352                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 353                 if (val == -1)
 354                         val = 0;
 355                 np->tclass = val;
 356                 retv = 0;
 357                 break;
 358
 359         case IPV6_RECVTCLASS:
 360                 if (optlen < sizeof(int))
 361                         goto e_inval;
 362                 np->rxopt.bits.rxtclass = valbool;
 363                 retv = 0;
 364                 break;
 365
 366         case IPV6_FLOWINFO:
 367                 if (optlen < sizeof(int))
 368                         goto e_inval;
 369                 np->rxopt.bits.rxflow = valbool;
 370                 retv = 0;
 371                 break;
 372
 373         case IPV6_RECVPATHMTU:
 374                 if (optlen < sizeof(int))
 375                         goto e_inval;
 376                 np->rxopt.bits.rxpmtu = valbool;
 377                 retv = 0;
 378                 break;
 379
 380         case IPV6_TRANSPARENT:
 381                 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 382                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 383                         retv = -EPERM;
 384                         break;
 385                 }
 386                 if (optlen < sizeof(int))
 387                         goto e_inval;
 388                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 389                 inet_sk(sk)->transparent = valbool;
 390                 retv = 0;
 391                 break;
 392
 393         case IPV6_FREEBIND:
 394                 if (optlen < sizeof(int))
 395                         goto e_inval;
 396                 /* we also don't have a separate freebind bit for IPV6 */
 397                 inet_sk(sk)->freebind = valbool;
 398                 retv = 0;
 399                 break;
 400
 401         case IPV6_RECVORIGDSTADDR:
 402                 if (optlen < sizeof(int))
 403                         goto e_inval;
 404                 np->rxopt.bits.rxorigdstaddr = valbool;
 405                 retv = 0;
 406                 break;
 407
 408         case IPV6_HOPOPTS:
 409         case IPV6_RTHDRDSTOPTS:
 410         case IPV6_RTHDR:
 411         case IPV6_DSTOPTS:
 412         {
 413                 struct ipv6_txoptions *opt;
 414                 struct ipv6_opt_hdr *new = NULL;
 415
 416                 /* hop-by-hop / destination options are privileged option */
 417                 retv = -EPERM;
 418                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 419                         break;
 420
 421                 /* remove any sticky options header with a zero option
 422                  * length, per RFC3542.
 423                  */
 424                 if (optlen == 0)
 425                         optval = NULL;
 426                 else if (!optval)
 427                         goto e_inval;
 428                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 429                          optlen & 0x7 || optlen > 8 * 255)
 430                         goto e_inval;
 431                 else {
 432                         new = memdup_user(optval, optlen);
 433                         if (IS_ERR(new)) {
 434                                 retv = PTR_ERR(new);
 435                                 break;
 436                         }
 437                         if (unlikely(ipv6_optlen(new) > optlen)) {
 438                                 kfree(new);
 439                                 goto e_inval;
 440                         }
 441                 }
 442
 443                 opt = rcu_dereference_protected(np->opt,
 444                                                 lockdep_sock_is_held(sk));
 445                 opt = ipv6_renew_options(sk, opt, optname, new);
 446                 kfree(new);
 447                 if (IS_ERR(opt)) {
 448                         retv = PTR_ERR(opt);
 449                         break;
 450                 }
 451
 452                 /* routing header option needs extra check */
 453                 retv = -EINVAL;
 454                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 455                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 456                         switch (rthdr->type) {
 457 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 458                         case IPV6_SRCRT_TYPE_2:
 459                                 if (rthdr->hdrlen != 2 ||
 460                                     rthdr->segments_left != 1)
 461                                         goto sticky_done;
 462
 463                                 break;
 464 #endif
 465                         case IPV6_SRCRT_TYPE_4:
 466                         {
 467                                 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
 468                                                           opt->srcrt;
 469
 470                                 if (!seg6_validate_srh(srh, optlen))
 471                                         goto sticky_done;
 472                                 break;
 473                         }
 474                         default:
 475                                 goto sticky_done;
 476                         }
 477                 }
 478
 479                 retv = 0;
 480                 opt = ipv6_update_options(sk, opt);
 481 sticky_done:
 482                 if (opt) {
 483                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 484                         txopt_put(opt);
 485                 }
 486                 break;
 487         }
 488
 489         case IPV6_PKTINFO:
 490         {
 491                 struct in6_pktinfo pkt;
 492
 493                 if (optlen == 0)
 494                         goto e_inval;
 495                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 496                         goto e_inval;
 497
 498                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 499                                 retv = -EFAULT;
 500                                 break;
 501                 }
 502                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 503                         goto e_inval;
 504
 505                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 506                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 507                 retv = 0;
 508                 break;
 509         }
 510
 511         case IPV6_2292PKTOPTIONS:
 512         {
 513                 struct ipv6_txoptions *opt = NULL;
 514                 struct msghdr msg;
 515                 struct flowi6 fl6;
 516                 struct ipcm6_cookie ipc6;
 517
 518                 memset(&fl6, 0, sizeof(fl6));
 519                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 520                 fl6.flowi6_mark = sk->sk_mark;
 521
 522                 if (optlen == 0)
 523                         goto update;
 524
 525                 /* 1K is probably excessive
 526                  * 1K is surely not enough, 2K per standard header is 16K.
 527                  */
 528                 retv = -EINVAL;
 529                 if (optlen > 64*1024)
 530                         break;
 531
 532                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 533                 retv = -ENOBUFS;
 534                 if (!opt)
 535                         break;
 536
 537                 memset(opt, 0, sizeof(*opt));
 538                 refcount_set(&opt->refcnt, 1);
 539                 opt->tot_len = sizeof(*opt) + optlen;
 540                 retv = -EFAULT;
 541                 if (copy_from_user(opt+1, optval, optlen))
 542                         goto done;
 543
 544                 msg.msg_controllen = optlen;
 545                 msg.msg_control = (void *)(opt+1);
 546                 ipc6.opt = opt;
 547
 548                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
 549                 if (retv)
 550                         goto done;
 551 update:
 552                 retv = 0;
 553                 opt = ipv6_update_options(sk, opt);
 554 done:
 555                 if (opt) {
 556                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 557                         txopt_put(opt);
 558                 }
 559                 break;
 560         }
 561         case IPV6_UNICAST_HOPS:
 562                 if (optlen < sizeof(int))
 563                         goto e_inval;
 564                 if (val > 255 || val < -1)
 565                         goto e_inval;
 566                 np->hop_limit = val;
 567                 retv = 0;
 568                 break;
 569
 570         case IPV6_MULTICAST_HOPS:
 571                 if (sk->sk_type == SOCK_STREAM)
 572                         break;
 573                 if (optlen < sizeof(int))
 574                         goto e_inval;
 575                 if (val > 255 || val < -1)
 576                         goto e_inval;
 577                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 578                 retv = 0;
 579                 break;
 580
 581         case IPV6_MULTICAST_LOOP:
 582                 if (optlen < sizeof(int))
 583                         goto e_inval;
 584                 if (val != valbool)
 585                         goto e_inval;
 586                 np->mc_loop = valbool;
 587                 retv = 0;
 588                 break;
 589
 590         case IPV6_UNICAST_IF:
 591         {
 592                 struct net_device *dev = NULL;
 593                 int ifindex;
 594
 595                 if (optlen != sizeof(int))
 596                         goto e_inval;
 597
 598                 ifindex = (__force int)ntohl((__force __be32)val);
 599                 if (ifindex == 0) {
 600                         np->ucast_oif = 0;
 601                         retv = 0;
 602                         break;
 603                 }
 604
 605                 dev = dev_get_by_index(net, ifindex);
 606                 retv = -EADDRNOTAVAIL;
 607                 if (!dev)
 608                         break;
 609                 dev_put(dev);
 610
 611                 retv = -EINVAL;
 612                 if (sk->sk_bound_dev_if)
 613                         break;
 614
 615                 np->ucast_oif = ifindex;
 616                 retv = 0;
 617                 break;
 618         }
 619
 620         case IPV6_MULTICAST_IF:
 621                 if (sk->sk_type == SOCK_STREAM)
 622                         break;
 623                 if (optlen < sizeof(int))
 624                         goto e_inval;
 625
 626                 if (val) {
 627                         struct net_device *dev;
 628                         int midx;
 629
 630                         rcu_read_lock();
 631
 632                         dev = dev_get_by_index_rcu(net, val);
 633                         if (!dev) {
 634                                 rcu_read_unlock();
 635                                 retv = -ENODEV;
 636                                 break;
 637                         }
 638                         midx = l3mdev_master_ifindex_rcu(dev);
 639
 640                         rcu_read_unlock();
 641
 642                         if (sk->sk_bound_dev_if &&
 643                             sk->sk_bound_dev_if != val &&
 644                             (!midx || midx != sk->sk_bound_dev_if))
 645                                 goto e_inval;
 646                 }
 647                 np->mcast_oif = val;
 648                 retv = 0;
 649                 break;
 650         case IPV6_ADD_MEMBERSHIP:
 651         case IPV6_DROP_MEMBERSHIP:
 652         {
 653                 struct ipv6_mreq mreq;
 654
 655                 if (optlen < sizeof(struct ipv6_mreq))
 656                         goto e_inval;
 657
 658                 retv = -EPROTO;
 659                 if (inet_sk(sk)->is_icsk)
 660                         break;
 661
 662                 retv = -EFAULT;
 663                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 664                         break;
 665
 666                 if (optname == IPV6_ADD_MEMBERSHIP)
 667                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 668                 else
 669                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 670                 break;
 671         }
 672         case IPV6_JOIN_ANYCAST:
 673         case IPV6_LEAVE_ANYCAST:
 674         {
 675                 struct ipv6_mreq mreq;
 676
 677                 if (optlen < sizeof(struct ipv6_mreq))
 678                         goto e_inval;
 679
 680                 retv = -EFAULT;
 681                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 682                         break;
 683
 684                 if (optname == IPV6_JOIN_ANYCAST)
 685                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 686                 else
 687                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 688                 break;
 689         }
 690         case MCAST_JOIN_GROUP:
 691         case MCAST_LEAVE_GROUP:
 692         {
 693                 struct group_req greq;
 694                 struct sockaddr_in6 *psin6;
 695
 696                 if (optlen < sizeof(struct group_req))
 697                         goto e_inval;
 698
 699                 retv = -EFAULT;
 700                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 701                         break;
 702                 if (greq.gr_group.ss_family != AF_INET6) {
 703                         retv = -EADDRNOTAVAIL;
 704                         break;
 705                 }
 706                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 707                 if (optname == MCAST_JOIN_GROUP)
 708                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 709                                                  &psin6->sin6_addr);
 710                 else
 711                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 712                                                  &psin6->sin6_addr);
 713                 break;
 714         }
 715         case MCAST_JOIN_SOURCE_GROUP:
 716         case MCAST_LEAVE_SOURCE_GROUP:
 717         case MCAST_BLOCK_SOURCE:
 718         case MCAST_UNBLOCK_SOURCE:
 719         {
 720                 struct group_source_req greqs;
 721                 int omode, add;
 722
 723                 if (optlen < sizeof(struct group_source_req))
 724                         goto e_inval;
 725                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 726                         retv = -EFAULT;
 727                         break;
 728                 }
 729                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 730                     greqs.gsr_source.ss_family != AF_INET6) {
 731                         retv = -EADDRNOTAVAIL;
 732                         break;
 733                 }
 734                 if (optname == MCAST_BLOCK_SOURCE) {
 735                         omode = MCAST_EXCLUDE;
 736                         add = 1;
 737                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 738                         omode = MCAST_EXCLUDE;
 739                         add = 0;
 740                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 741                         struct sockaddr_in6 *psin6;
 742
 743                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 744                         retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
 745                                                      &psin6->sin6_addr,
 746                                                      MCAST_INCLUDE);
 747                         /* prior join w/ different source is ok */
 748                         if (retv && retv != -EADDRINUSE)
 749                                 break;
 750                         omode = MCAST_INCLUDE;
 751                         add = 1;
 752                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 753                         omode = MCAST_INCLUDE;
 754                         add = 0;
 755                 }
 756                 retv = ip6_mc_source(add, omode, sk, &greqs);
 757                 break;
 758         }
 759         case MCAST_MSFILTER:
 760         {
 761                 struct group_filter *gsf;
 762
 763                 if (optlen < GROUP_FILTER_SIZE(0))
 764                         goto e_inval;
 765                 if (optlen > sysctl_optmem_max) {
 766                         retv = -ENOBUFS;
 767                         break;
 768                 }
 769                 gsf = memdup_user(optval, optlen);
 770                 if (IS_ERR(gsf)) {
 771                         retv = PTR_ERR(gsf);
 772                         break;
 773                 }
 774                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 775                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 776                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 777                         kfree(gsf);
 778                         retv = -ENOBUFS;
 779                         break;
 780                 }
 781                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 782                         kfree(gsf);
 783                         retv = -EINVAL;
 784                         break;
 785                 }
 786                 retv = ip6_mc_msfilter(sk, gsf);
 787                 kfree(gsf);
 788
 789                 break;
 790         }
 791         case IPV6_ROUTER_ALERT:
 792                 if (optlen < sizeof(int))
 793                         goto e_inval;
 794                 retv = ip6_ra_control(sk, val);
 795                 break;
 796         case IPV6_MTU_DISCOVER:
 797                 if (optlen < sizeof(int))
 798                         goto e_inval;
 799                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 800                         goto e_inval;
 801                 np->pmtudisc = val;
 802                 retv = 0;
 803                 break;
 804         case IPV6_MTU:
 805                 if (optlen < sizeof(int))
 806                         goto e_inval;
 807                 if (val && val < IPV6_MIN_MTU)
 808                         goto e_inval;
 809                 np->frag_size = val;
 810                 retv = 0;
 811                 break;
 812         case IPV6_RECVERR:
 813                 if (optlen < sizeof(int))
 814                         goto e_inval;
 815                 np->recverr = valbool;
 816                 if (!val)
 817                         skb_queue_purge(&sk->sk_error_queue);
 818                 retv = 0;
 819                 break;
 820         case IPV6_FLOWINFO_SEND:
 821                 if (optlen < sizeof(int))
 822                         goto e_inval;
 823                 np->sndflow = valbool;
 824                 retv = 0;
 825                 break;
 826         case IPV6_FLOWLABEL_MGR:
 827                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 828                 break;
 829         case IPV6_IPSEC_POLICY:
 830         case IPV6_XFRM_POLICY:
 831                 retv = -EPERM;
 832                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 833                         break;
 834                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 835                 break;
 836
 837         case IPV6_ADDR_PREFERENCES:
 838             {
 839                 unsigned int pref = 0;
 840                 unsigned int prefmask = ~0;
 841
 842                 if (optlen < sizeof(int))
 843                         goto e_inval;
 844
 845                 retv = -EINVAL;
 846
 847                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 848                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 849                                IPV6_PREFER_SRC_TMP|
 850                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 851                 case IPV6_PREFER_SRC_PUBLIC:
 852                         pref |= IPV6_PREFER_SRC_PUBLIC;
 853                         break;
 854                 case IPV6_PREFER_SRC_TMP:
 855                         pref |= IPV6_PREFER_SRC_TMP;
 856                         break;
 857                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 858                         break;
 859                 case 0:
 860                         goto pref_skip_pubtmp;
 861                 default:
 862                         goto e_inval;
 863                 }
 864
 865                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 866                               IPV6_PREFER_SRC_TMP);
 867 pref_skip_pubtmp:
 868
 869                 /* check HOME/COA conflicts */
 870                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 871                 case IPV6_PREFER_SRC_HOME:
 872                         break;
 873                 case IPV6_PREFER_SRC_COA:
 874                         pref |= IPV6_PREFER_SRC_COA;
 875                 case 0:
 876                         goto pref_skip_coa;
 877                 default:
 878                         goto e_inval;
 879                 }
 880
 881                 prefmask &= ~IPV6_PREFER_SRC_COA;
 882 pref_skip_coa:
 883
 884                 /* check CGA/NONCGA conflicts */
 885                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 886                 case IPV6_PREFER_SRC_CGA:
 887                 case IPV6_PREFER_SRC_NONCGA:
 888                 case 0:
 889                         break;
 890                 default:
 891                         goto e_inval;
 892                 }
 893
 894                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 895                 retv = 0;
 896
 897                 break;
 898             }
 899         case IPV6_MINHOPCOUNT:
 900                 if (optlen < sizeof(int))
 901                         goto e_inval;
 902                 if (val < 0 || val > 255)
 903                         goto e_inval;
 904                 np->min_hopcount = val;
 905                 retv = 0;
 906                 break;
 907         case IPV6_DONTFRAG:
 908                 np->dontfrag = valbool;
 909                 retv = 0;
 910                 break;
 911         case IPV6_AUTOFLOWLABEL:
 912                 np->autoflowlabel = valbool;
 913                 np->autoflowlabel_set = 1;
 914                 retv = 0;
 915                 break;
 916         case IPV6_RECVFRAGSIZE:
 917                 np->rxopt.bits.recvfragsize = valbool;
 918                 retv = 0;
 919                 break;
 920         }
 921
 922 unlock:
 923         release_sock(sk);
 924         if (needs_rtnl)
 925                 rtnl_unlock();
 926
 927         return retv;
 928
 929 e_inval:
 930         release_sock(sk);
 931         if (needs_rtnl)
 932                 rtnl_unlock();
 933         return -EINVAL;
 934 }
 935
 936 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 937                     char __user *optval, unsigned int optlen)
 938 {
 939         int err;
 940
 941         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 942                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 943
 944         if (level != SOL_IPV6)
 945                 return -ENOPROTOOPT;
 946
 947         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 948 #ifdef CONFIG_NETFILTER
 949         /* we need to exclude all possible ENOPROTOOPTs except default case */
 950         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 951                         optname != IPV6_XFRM_POLICY)
 952                 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
 953 #endif
 954         return err;
 955 }
 956 EXPORT_SYMBOL(ipv6_setsockopt);
 957
 958 #ifdef CONFIG_COMPAT
 959 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 960                            char __user *optval, unsigned int optlen)
 961 {
 962         int err;
 963
 964         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 965                 if (udp_prot.compat_setsockopt != NULL)
 966                         return udp_prot.compat_setsockopt(sk, level, optname,
 967                                                           optval, optlen);
 968                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 969         }
 970
 971         if (level != SOL_IPV6)
 972                 return -ENOPROTOOPT;
 973
 974         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 975                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 976                         ipv6_setsockopt);
 977
 978         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 979 #ifdef CONFIG_NETFILTER
 980         /* we need to exclude all possible ENOPROTOOPTs except default case */
 981         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 982             optname != IPV6_XFRM_POLICY)
 983                 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
 984                                            optlen);
 985 #endif
 986         return err;
 987 }
 988 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 989 #endif
 990
 991 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 992                                   int optname, char __user *optval, int len)
 993 {
 994         struct ipv6_opt_hdr *hdr;
 995
 996         if (!opt)
 997                 return 0;
 998
 999         switch (optname) {
1000         case IPV6_HOPOPTS:
1001                 hdr = opt->hopopt;
1002                 break;
1003         case IPV6_RTHDRDSTOPTS:
1004                 hdr = opt->dst0opt;
1005                 break;
1006         case IPV6_RTHDR:
1007                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1008                 break;
1009         case IPV6_DSTOPTS:
1010                 hdr = opt->dst1opt;
1011                 break;
1012         default:
1013                 return -EINVAL; /* should not happen */
1014         }
1015
1016         if (!hdr)
1017                 return 0;
1018
1019         len = min_t(unsigned int, len, ipv6_optlen(hdr));
1020         if (copy_to_user(optval, hdr, len))
1021                 return -EFAULT;
1022         return len;
1023 }
1024
1025 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1026                     char __user *optval, int __user *optlen, unsigned int flags)
1027 {
1028         struct ipv6_pinfo *np = inet6_sk(sk);
1029         int len;
1030         int val;
1031
1032         if (ip6_mroute_opt(optname))
1033                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1034
1035         if (get_user(len, optlen))
1036                 return -EFAULT;
1037         switch (optname) {
1038         case IPV6_ADDRFORM:
1039                 if (sk->sk_protocol != IPPROTO_UDP &&
1040                     sk->sk_protocol != IPPROTO_UDPLITE &&
1041                     sk->sk_protocol != IPPROTO_TCP)
1042                         return -ENOPROTOOPT;
1043                 if (sk->sk_state != TCP_ESTABLISHED)
1044                         return -ENOTCONN;
1045                 val = sk->sk_family;
1046                 break;
1047         case MCAST_MSFILTER:
1048         {
1049                 struct group_filter gsf;
1050                 int err;
1051
1052                 if (len < GROUP_FILTER_SIZE(0))
1053                         return -EINVAL;
1054                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1055                         return -EFAULT;
1056                 if (gsf.gf_group.ss_family != AF_INET6)
1057                         return -EADDRNOTAVAIL;
1058                 lock_sock(sk);
1059                 err = ip6_mc_msfget(sk, &gsf,
1060                         (struct group_filter __user *)optval, optlen);
1061                 release_sock(sk);
1062                 return err;
1063         }
1064
1065         case IPV6_2292PKTOPTIONS:
1066         {
1067                 struct msghdr msg;
1068                 struct sk_buff *skb;
1069
1070                 if (sk->sk_type != SOCK_STREAM)
1071                         return -ENOPROTOOPT;
1072
1073                 msg.msg_control = optval;
1074                 msg.msg_controllen = len;
1075                 msg.msg_flags = flags;
1076
1077                 lock_sock(sk);
1078                 skb = np->pktoptions;
1079                 if (skb)
1080                         ip6_datagram_recv_ctl(sk, &msg, skb);
1081                 release_sock(sk);
1082                 if (!skb) {
1083                         if (np->rxopt.bits.rxinfo) {
1084                                 struct in6_pktinfo src_info;
1085                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1086                                         np->sticky_pktinfo.ipi6_ifindex;
1087                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1088                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1089                         }
1090                         if (np->rxopt.bits.rxhlim) {
1091                                 int hlim = np->mcast_hops;
1092                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1093                         }
1094                         if (np->rxopt.bits.rxtclass) {
1095                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1096
1097                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1098                         }
1099                         if (np->rxopt.bits.rxoinfo) {
1100                                 struct in6_pktinfo src_info;
1101                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1102                                         np->sticky_pktinfo.ipi6_ifindex;
1103                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1104                                                                      np->sticky_pktinfo.ipi6_addr;
1105                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1106                         }
1107                         if (np->rxopt.bits.rxohlim) {
1108                                 int hlim = np->mcast_hops;
1109                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1110                         }
1111                         if (np->rxopt.bits.rxflow) {
1112                                 __be32 flowinfo = np->rcv_flowinfo;
1113
1114                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1115                         }
1116                 }
1117                 len -= msg.msg_controllen;
1118                 return put_user(len, optlen);
1119         }
1120         case IPV6_MTU:
1121         {
1122                 struct dst_entry *dst;
1123
1124                 val = 0;
1125                 rcu_read_lock();
1126                 dst = __sk_dst_get(sk);
1127                 if (dst)
1128                         val = dst_mtu(dst);
1129                 rcu_read_unlock();
1130                 if (!val)
1131                         return -ENOTCONN;
1132                 break;
1133         }
1134
1135         case IPV6_V6ONLY:
1136                 val = sk->sk_ipv6only;
1137                 break;
1138
1139         case IPV6_RECVPKTINFO:
1140                 val = np->rxopt.bits.rxinfo;
1141                 break;
1142
1143         case IPV6_2292PKTINFO:
1144                 val = np->rxopt.bits.rxoinfo;
1145                 break;
1146
1147         case IPV6_RECVHOPLIMIT:
1148                 val = np->rxopt.bits.rxhlim;
1149                 break;
1150
1151         case IPV6_2292HOPLIMIT:
1152                 val = np->rxopt.bits.rxohlim;
1153                 break;
1154
1155         case IPV6_RECVRTHDR:
1156                 val = np->rxopt.bits.srcrt;
1157                 break;
1158
1159         case IPV6_2292RTHDR:
1160                 val = np->rxopt.bits.osrcrt;
1161                 break;
1162
1163         case IPV6_HOPOPTS:
1164         case IPV6_RTHDRDSTOPTS:
1165         case IPV6_RTHDR:
1166         case IPV6_DSTOPTS:
1167         {
1168                 struct ipv6_txoptions *opt;
1169
1170                 lock_sock(sk);
1171                 opt = rcu_dereference_protected(np->opt,
1172                                                 lockdep_sock_is_held(sk));
1173                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1174                 release_sock(sk);
1175                 /* check if ipv6_getsockopt_sticky() returns err code */
1176                 if (len < 0)
1177                         return len;
1178                 return put_user(len, optlen);
1179         }
1180
1181         case IPV6_RECVHOPOPTS:
1182                 val = np->rxopt.bits.hopopts;
1183                 break;
1184
1185         case IPV6_2292HOPOPTS:
1186                 val = np->rxopt.bits.ohopopts;
1187                 break;
1188
1189         case IPV6_RECVDSTOPTS:
1190                 val = np->rxopt.bits.dstopts;
1191                 break;
1192
1193         case IPV6_2292DSTOPTS:
1194                 val = np->rxopt.bits.odstopts;
1195                 break;
1196
1197         case IPV6_TCLASS:
1198                 val = np->tclass;
1199                 break;
1200
1201         case IPV6_RECVTCLASS:
1202                 val = np->rxopt.bits.rxtclass;
1203                 break;
1204
1205         case IPV6_FLOWINFO:
1206                 val = np->rxopt.bits.rxflow;
1207                 break;
1208
1209         case IPV6_RECVPATHMTU:
1210                 val = np->rxopt.bits.rxpmtu;
1211                 break;
1212
1213         case IPV6_PATHMTU:
1214         {
1215                 struct dst_entry *dst;
1216                 struct ip6_mtuinfo mtuinfo;
1217
1218                 if (len < sizeof(mtuinfo))
1219                         return -EINVAL;
1220
1221                 len = sizeof(mtuinfo);
1222                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1223
1224                 rcu_read_lock();
1225                 dst = __sk_dst_get(sk);
1226                 if (dst)
1227                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1228                 rcu_read_unlock();
1229                 if (!mtuinfo.ip6m_mtu)
1230                         return -ENOTCONN;
1231
1232                 if (put_user(len, optlen))
1233                         return -EFAULT;
1234                 if (copy_to_user(optval, &mtuinfo, len))
1235                         return -EFAULT;
1236
1237                 return 0;
1238         }
1239
1240         case IPV6_TRANSPARENT:
1241                 val = inet_sk(sk)->transparent;
1242                 break;
1243
1244         case IPV6_FREEBIND:
1245                 val = inet_sk(sk)->freebind;
1246                 break;
1247
1248         case IPV6_RECVORIGDSTADDR:
1249                 val = np->rxopt.bits.rxorigdstaddr;
1250                 break;
1251
1252         case IPV6_UNICAST_HOPS:
1253         case IPV6_MULTICAST_HOPS:
1254         {
1255                 struct dst_entry *dst;
1256
1257                 if (optname == IPV6_UNICAST_HOPS)
1258                         val = np->hop_limit;
1259                 else
1260                         val = np->mcast_hops;
1261
1262                 if (val < 0) {
1263                         rcu_read_lock();
1264                         dst = __sk_dst_get(sk);
1265                         if (dst)
1266                                 val = ip6_dst_hoplimit(dst);
1267                         rcu_read_unlock();
1268                 }
1269
1270                 if (val < 0)
1271                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1272                 break;
1273         }
1274
1275         case IPV6_MULTICAST_LOOP:
1276                 val = np->mc_loop;
1277                 break;
1278
1279         case IPV6_MULTICAST_IF:
1280                 val = np->mcast_oif;
1281                 break;
1282
1283         case IPV6_UNICAST_IF:
1284                 val = (__force int)htonl((__u32) np->ucast_oif);
1285                 break;
1286
1287         case IPV6_MTU_DISCOVER:
1288                 val = np->pmtudisc;
1289                 break;
1290
1291         case IPV6_RECVERR:
1292                 val = np->recverr;
1293                 break;
1294
1295         case IPV6_FLOWINFO_SEND:
1296                 val = np->sndflow;
1297                 break;
1298
1299         case IPV6_FLOWLABEL_MGR:
1300         {
1301                 struct in6_flowlabel_req freq;
1302                 int flags;
1303
1304                 if (len < sizeof(freq))
1305                         return -EINVAL;
1306
1307                 if (copy_from_user(&freq, optval, sizeof(freq)))
1308                         return -EFAULT;
1309
1310                 if (freq.flr_action != IPV6_FL_A_GET)
1311                         return -EINVAL;
1312
1313                 len = sizeof(freq);
1314                 flags = freq.flr_flags;
1315
1316                 memset(&freq, 0, sizeof(freq));
1317
1318                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1319                 if (val < 0)
1320                         return val;
1321
1322                 if (put_user(len, optlen))
1323                         return -EFAULT;
1324                 if (copy_to_user(optval, &freq, len))
1325                         return -EFAULT;
1326
1327                 return 0;
1328         }
1329
1330         case IPV6_ADDR_PREFERENCES:
1331                 val = 0;
1332
1333                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1334                         val |= IPV6_PREFER_SRC_TMP;
1335                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1336                         val |= IPV6_PREFER_SRC_PUBLIC;
1337                 else {
1338                         /* XXX: should we return system default? */
1339                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1340                 }
1341
1342                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1343                         val |= IPV6_PREFER_SRC_COA;
1344                 else
1345                         val |= IPV6_PREFER_SRC_HOME;
1346                 break;
1347
1348         case IPV6_MINHOPCOUNT:
1349                 val = np->min_hopcount;
1350                 break;
1351
1352         case IPV6_DONTFRAG:
1353                 val = np->dontfrag;
1354                 break;
1355
1356         case IPV6_AUTOFLOWLABEL:
1357                 val = ip6_autoflowlabel(sock_net(sk), np);
1358                 break;
1359
1360         case IPV6_RECVFRAGSIZE:
1361                 val = np->rxopt.bits.recvfragsize;
1362                 break;
1363
1364         default:
1365                 return -ENOPROTOOPT;
1366         }
1367         len = min_t(unsigned int, sizeof(int), len);
1368         if (put_user(len, optlen))
1369                 return -EFAULT;
1370         if (copy_to_user(optval, &val, len))
1371                 return -EFAULT;
1372         return 0;
1373 }
1374
1375 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1376                     char __user *optval, int __user *optlen)
1377 {
1378         int err;
1379
1380         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1381                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1382
1383         if (level != SOL_IPV6)
1384                 return -ENOPROTOOPT;
1385
1386         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1387 #ifdef CONFIG_NETFILTER
1388         /* we need to exclude all possible ENOPROTOOPTs except default case */
1389         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1390                 int len;
1391
1392                 if (get_user(len, optlen))
1393                         return -EFAULT;
1394
1395                 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1396                 if (err >= 0)
1397                         err = put_user(len, optlen);
1398         }
1399 #endif
1400         return err;
1401 }
1402 EXPORT_SYMBOL(ipv6_getsockopt);
1403
1404 #ifdef CONFIG_COMPAT
1405 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1406                            char __user *optval, int __user *optlen)
1407 {
1408         int err;
1409
1410         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1411                 if (udp_prot.compat_getsockopt != NULL)
1412                         return udp_prot.compat_getsockopt(sk, level, optname,
1413                                                           optval, optlen);
1414                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1415         }
1416
1417         if (level != SOL_IPV6)
1418                 return -ENOPROTOOPT;
1419
1420         if (optname == MCAST_MSFILTER)
1421                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1422                         ipv6_getsockopt);
1423
1424         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1425                                  MSG_CMSG_COMPAT);
1426 #ifdef CONFIG_NETFILTER
1427         /* we need to exclude all possible ENOPROTOOPTs except default case */
1428         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1429                 int len;
1430
1431                 if (get_user(len, optlen))
1432                         return -EFAULT;
1433
1434                 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1435                 if (err >= 0)
1436                         err = put_user(len, optlen);
1437         }
1438 #endif
1439         return err;
1440 }
1441 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1442 #endif