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