net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <[email protected]>
   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 <[email protected]>:
  22  *              - added multicast source filtering API for MLDv2
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/capability.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/socket.h>
  30 #include <linux/sockios.h>
  31 #include <linux/net.h>
  32 #include <linux/in6.h>
  33 #include <linux/mroute6.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/init.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/netfilter.h>
  39 #include <linux/slab.h>
  40
  41 #include <net/sock.h>
  42 #include <net/snmp.h>
  43 #include <net/ipv6.h>
  44 #include <net/ndisc.h>
  45 #include <net/protocol.h>
  46 #include <net/transp_v6.h>
  47 #include <net/ip6_route.h>
  48 #include <net/addrconf.h>
  49 #include <net/inet_common.h>
  50 #include <net/tcp.h>
  51 #include <net/udp.h>
  52 #include <net/udplite.h>
  53 #include <net/xfrm.h>
  54 #include <net/compat.h>
  55 #include <net/seg6.h>
  56
  57 #include <linux/uaccess.h>
  58
  59 struct ip6_ra_chain *ip6_ra_chain;
  60 DEFINE_RWLOCK(ip6_ra_lock);
  61
  62 int ip6_ra_control(struct sock *sk, int sel)
  63 {
  64         struct ip6_ra_chain *ra, *new_ra, **rap;
  65
  66         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  67         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  68                 return -ENOPROTOOPT;
  69
  70         new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  71
  72         write_lock_bh(&ip6_ra_lock);
  73         for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
  74                 if (ra->sk == sk) {
  75                         if (sel >= 0) {
  76                                 write_unlock_bh(&ip6_ra_lock);
  77                                 kfree(new_ra);
  78                                 return -EADDRINUSE;
  79                         }
  80
  81                         *rap = ra->next;
  82                         write_unlock_bh(&ip6_ra_lock);
  83
  84                         sock_put(sk);
  85                         kfree(ra);
  86                         return 0;
  87                 }
  88         }
  89         if (!new_ra) {
  90                 write_unlock_bh(&ip6_ra_lock);
  91                 return -ENOBUFS;
  92         }
  93         new_ra->sk = sk;
  94         new_ra->sel = sel;
  95         new_ra->next = ra;
  96         *rap = new_ra;
  97         sock_hold(sk);
  98         write_unlock_bh(&ip6_ra_lock);
  99         return 0;
 100 }
 101
 102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 103                                            struct ipv6_txoptions *opt)
 104 {
 105         if (inet_sk(sk)->is_icsk) {
 106                 if (opt &&
 107                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 108                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 109                         struct inet_connection_sock *icsk = inet_csk(sk);
 110                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 111                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 112                 }
 113         }
 114         opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
 115                    opt);
 116         sk_dst_reset(sk);
 117
 118         return opt;
 119 }
 120
 121 static bool setsockopt_needs_rtnl(int optname)
 122 {
 123         switch (optname) {
 124         case IPV6_ADDRFORM:
 125         case IPV6_ADD_MEMBERSHIP:
 126         case IPV6_DROP_MEMBERSHIP:
 127         case IPV6_JOIN_ANYCAST:
 128         case IPV6_LEAVE_ANYCAST:
 129         case MCAST_JOIN_GROUP:
 130         case MCAST_LEAVE_GROUP:
 131         case MCAST_JOIN_SOURCE_GROUP:
 132         case MCAST_LEAVE_SOURCE_GROUP:
 133         case MCAST_BLOCK_SOURCE:
 134         case MCAST_UNBLOCK_SOURCE:
 135         case MCAST_MSFILTER:
 136                 return true;
 137         }
 138         return false;
 139 }
 140
 141 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 142                     char __user *optval, unsigned int optlen)
 143 {
 144         struct ipv6_pinfo *np = inet6_sk(sk);
 145         struct net *net = sock_net(sk);
 146         int val, valbool;
 147         int retv = -ENOPROTOOPT;
 148         bool needs_rtnl = setsockopt_needs_rtnl(optname);
 149
 150         if (!optval)
 151                 val = 0;
 152         else {
 153                 if (optlen >= sizeof(int)) {
 154                         if (get_user(val, (int __user *) optval))
 155                                 return -EFAULT;
 156                 } else
 157                         val = 0;
 158         }
 159
 160         valbool = (val != 0);
 161
 162         if (ip6_mroute_opt(optname))
 163                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 164
 165         if (needs_rtnl)
 166                 rtnl_lock();
 167         lock_sock(sk);
 168
 169         switch (optname) {
 170
 171         case IPV6_ADDRFORM:
 172                 if (optlen < sizeof(int))
 173                         goto e_inval;
 174                 if (val == PF_INET) {
 175                         struct ipv6_txoptions *opt;
 176                         struct sk_buff *pktopt;
 177
 178                         if (sk->sk_type == SOCK_RAW)
 179                                 break;
 180
 181                         if (sk->sk_protocol == IPPROTO_UDP ||
 182                             sk->sk_protocol == IPPROTO_UDPLITE) {
 183                                 struct udp_sock *up = udp_sk(sk);
 184                                 if (up->pending == AF_INET6) {
 185                                         retv = -EBUSY;
 186                                         break;
 187                                 }
 188                         } else if (sk->sk_protocol != IPPROTO_TCP)
 189                                 break;
 190
 191                         if (sk->sk_state != TCP_ESTABLISHED) {
 192                                 retv = -ENOTCONN;
 193                                 break;
 194                         }
 195
 196                         if (ipv6_only_sock(sk) ||
 197                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 198                                 retv = -EADDRNOTAVAIL;
 199                                 break;
 200                         }
 201
 202                         fl6_free_socklist(sk);
 203                         __ipv6_sock_mc_close(sk);
 204
 205                         /*
 206                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 207                          * remove it from the refcnt debug socks count in the
 208                          * original family...
 209                          */
 210                         sk_refcnt_debug_dec(sk);
 211
 212                         if (sk->sk_protocol == IPPROTO_TCP) {
 213                                 struct inet_connection_sock *icsk = inet_csk(sk);
 214                                 local_bh_disable();
 215                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 216                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 217                                 local_bh_enable();
 218                                 sk->sk_prot = &tcp_prot;
 219                                 icsk->icsk_af_ops = &ipv4_specific;
 220                                 sk->sk_socket->ops = &inet_stream_ops;
 221                                 sk->sk_family = PF_INET;
 222                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 223                         } else {
 224                                 struct proto *prot = &udp_prot;
 225
 226                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 227                                         prot = &udplite_prot;
 228                                 local_bh_disable();
 229                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 230                                 sock_prot_inuse_add(net, prot, 1);
 231                                 local_bh_enable();
 232                                 sk->sk_prot = prot;
 233                                 sk->sk_socket->ops = &inet_dgram_ops;
 234                                 sk->sk_family = PF_INET;
 235                         }
 236                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
 237                                    NULL);
 238                         if (opt) {
 239                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 240                                 txopt_put(opt);
 241                         }
 242                         pktopt = xchg(&np->pktoptions, NULL);
 243                         kfree_skb(pktopt);
 244
 245                         /*
 246                          * ... and add it to the refcnt debug socks count
 247                          * in the new family. -acme
 248                          */
 249                         sk_refcnt_debug_inc(sk);
 250                         module_put(THIS_MODULE);
 251                         retv = 0;
 252                         break;
 253                 }
 254                 goto e_inval;
 255
 256         case IPV6_V6ONLY:
 257                 if (optlen < sizeof(int) ||
 258                     inet_sk(sk)->inet_num)
 259                         goto e_inval;
 260                 sk->sk_ipv6only = valbool;
 261                 retv = 0;
 262                 break;
 263
 264         case IPV6_RECVPKTINFO:
 265                 if (optlen < sizeof(int))
 266                         goto e_inval;
 267                 np->rxopt.bits.rxinfo = valbool;
 268                 retv = 0;
 269                 break;
 270
 271         case IPV6_2292PKTINFO:
 272                 if (optlen < sizeof(int))
 273                         goto e_inval;
 274                 np->rxopt.bits.rxoinfo = valbool;
 275                 retv = 0;
 276                 break;
 277
 278         case IPV6_RECVHOPLIMIT:
 279                 if (optlen < sizeof(int))
 280                         goto e_inval;
 281                 np->rxopt.bits.rxhlim = valbool;
 282                 retv = 0;
 283                 break;
 284
 285         case IPV6_2292HOPLIMIT:
 286                 if (optlen < sizeof(int))
 287                         goto e_inval;
 288                 np->rxopt.bits.rxohlim = valbool;
 289                 retv = 0;
 290                 break;
 291
 292         case IPV6_RECVRTHDR:
 293                 if (optlen < sizeof(int))
 294                         goto e_inval;
 295                 np->rxopt.bits.srcrt = valbool;
 296                 retv = 0;
 297                 break;
 298
 299         case IPV6_2292RTHDR:
 300                 if (optlen < sizeof(int))
 301                         goto e_inval;
 302                 np->rxopt.bits.osrcrt = valbool;
 303                 retv = 0;
 304                 break;
 305
 306         case IPV6_RECVHOPOPTS:
 307                 if (optlen < sizeof(int))
 308                         goto e_inval;
 309                 np->rxopt.bits.hopopts = valbool;
 310                 retv = 0;
 311                 break;
 312
 313         case IPV6_2292HOPOPTS:
 314                 if (optlen < sizeof(int))
 315                         goto e_inval;
 316                 np->rxopt.bits.ohopopts = valbool;
 317                 retv = 0;
 318                 break;
 319
 320         case IPV6_RECVDSTOPTS:
 321                 if (optlen < sizeof(int))
 322                         goto e_inval;
 323                 np->rxopt.bits.dstopts = valbool;
 324                 retv = 0;
 325                 break;
 326
 327         case IPV6_2292DSTOPTS:
 328                 if (optlen < sizeof(int))
 329                         goto e_inval;
 330                 np->rxopt.bits.odstopts = valbool;
 331                 retv = 0;
 332                 break;
 333
 334         case IPV6_TCLASS:
 335                 if (optlen < sizeof(int))
 336                         goto e_inval;
 337                 if (val < -1 || val > 0xff)
 338                         goto e_inval;
 339                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 340                 if (val == -1)
 341                         val = 0;
 342                 np->tclass = val;
 343                 retv = 0;
 344                 break;
 345
 346         case IPV6_RECVTCLASS:
 347                 if (optlen < sizeof(int))
 348                         goto e_inval;
 349                 np->rxopt.bits.rxtclass = valbool;
 350                 retv = 0;
 351                 break;
 352
 353         case IPV6_FLOWINFO:
 354                 if (optlen < sizeof(int))
 355                         goto e_inval;
 356                 np->rxopt.bits.rxflow = valbool;
 357                 retv = 0;
 358                 break;
 359
 360         case IPV6_RECVPATHMTU:
 361                 if (optlen < sizeof(int))
 362                         goto e_inval;
 363                 np->rxopt.bits.rxpmtu = valbool;
 364                 retv = 0;
 365                 break;
 366
 367         case IPV6_TRANSPARENT:
 368                 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
 369                     !ns_capable(net->user_ns, CAP_NET_RAW)) {
 370                         retv = -EPERM;
 371                         break;
 372                 }
 373                 if (optlen < sizeof(int))
 374                         goto e_inval;
 375                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 376                 inet_sk(sk)->transparent = valbool;
 377                 retv = 0;
 378                 break;
 379
 380         case IPV6_FREEBIND:
 381                 if (optlen < sizeof(int))
 382                         goto e_inval;
 383                 /* we also don't have a separate freebind bit for IPV6 */
 384                 inet_sk(sk)->freebind = valbool;
 385                 retv = 0;
 386                 break;
 387
 388         case IPV6_RECVORIGDSTADDR:
 389                 if (optlen < sizeof(int))
 390                         goto e_inval;
 391                 np->rxopt.bits.rxorigdstaddr = valbool;
 392                 retv = 0;
 393                 break;
 394
 395         case IPV6_HOPOPTS:
 396         case IPV6_RTHDRDSTOPTS:
 397         case IPV6_RTHDR:
 398         case IPV6_DSTOPTS:
 399         {
 400                 struct ipv6_txoptions *opt;
 401
 402                 /* remove any sticky options header with a zero option
 403                  * length, per RFC3542.
 404                  */
 405                 if (optlen == 0)
 406                         optval = NULL;
 407                 else if (!optval)
 408                         goto e_inval;
 409                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 410                          optlen & 0x7 || optlen > 8 * 255)
 411                         goto e_inval;
 412
 413                 /* hop-by-hop / destination options are privileged option */
 414                 retv = -EPERM;
 415                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 416                         break;
 417
 418                 opt = rcu_dereference_protected(np->opt,
 419                                                 lockdep_sock_is_held(sk));
 420                 opt = ipv6_renew_options(sk, opt, optname,
 421                                          (struct ipv6_opt_hdr __user *)optval,
 422                                          optlen);
 423                 if (IS_ERR(opt)) {
 424                         retv = PTR_ERR(opt);
 425                         break;
 426                 }
 427
 428                 /* routing header option needs extra check */
 429                 retv = -EINVAL;
 430                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 431                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 432                         switch (rthdr->type) {
 433 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 434                         case IPV6_SRCRT_TYPE_2:
 435                                 if (rthdr->hdrlen != 2 ||
 436                                     rthdr->segments_left != 1)
 437                                         goto sticky_done;
 438
 439                                 break;
 440 #endif
 441                         case IPV6_SRCRT_TYPE_4:
 442                         {
 443                                 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
 444                                                           opt->srcrt;
 445
 446                                 if (!seg6_validate_srh(srh, optlen))
 447                                         goto sticky_done;
 448                                 break;
 449                         }
 450                         default:
 451                                 goto sticky_done;
 452                         }
 453                 }
 454
 455                 retv = 0;
 456                 opt = ipv6_update_options(sk, opt);
 457 sticky_done:
 458                 if (opt) {
 459                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 460                         txopt_put(opt);
 461                 }
 462                 break;
 463         }
 464
 465         case IPV6_PKTINFO:
 466         {
 467                 struct in6_pktinfo pkt;
 468
 469                 if (optlen == 0)
 470                         goto e_inval;
 471                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 472                         goto e_inval;
 473
 474                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 475                                 retv = -EFAULT;
 476                                 break;
 477                 }
 478                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 479                         goto e_inval;
 480
 481                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 482                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 483                 retv = 0;
 484                 break;
 485         }
 486
 487         case IPV6_2292PKTOPTIONS:
 488         {
 489                 struct ipv6_txoptions *opt = NULL;
 490                 struct msghdr msg;
 491                 struct flowi6 fl6;
 492                 struct sockcm_cookie sockc_junk;
 493                 struct ipcm6_cookie ipc6;
 494
 495                 memset(&fl6, 0, sizeof(fl6));
 496                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 497                 fl6.flowi6_mark = sk->sk_mark;
 498
 499                 if (optlen == 0)
 500                         goto update;
 501
 502                 /* 1K is probably excessive
 503                  * 1K is surely not enough, 2K per standard header is 16K.
 504                  */
 505                 retv = -EINVAL;
 506                 if (optlen > 64*1024)
 507                         break;
 508
 509                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 510                 retv = -ENOBUFS;
 511                 if (!opt)
 512                         break;
 513
 514                 memset(opt, 0, sizeof(*opt));
 515                 refcount_set(&opt->refcnt, 1);
 516                 opt->tot_len = sizeof(*opt) + optlen;
 517                 retv = -EFAULT;
 518                 if (copy_from_user(opt+1, optval, optlen))
 519                         goto done;
 520
 521                 msg.msg_controllen = optlen;
 522                 msg.msg_control = (void *)(opt+1);
 523                 ipc6.opt = opt;
 524
 525                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6, &sockc_junk);
 526                 if (retv)
 527                         goto done;
 528 update:
 529                 retv = 0;
 530                 opt = ipv6_update_options(sk, opt);
 531 done:
 532                 if (opt) {
 533                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 534                         txopt_put(opt);
 535                 }
 536                 break;
 537         }
 538         case IPV6_UNICAST_HOPS:
 539                 if (optlen < sizeof(int))
 540                         goto e_inval;
 541                 if (val > 255 || val < -1)
 542                         goto e_inval;
 543                 np->hop_limit = val;
 544                 retv = 0;
 545                 break;
 546
 547         case IPV6_MULTICAST_HOPS:
 548                 if (sk->sk_type == SOCK_STREAM)
 549                         break;
 550                 if (optlen < sizeof(int))
 551                         goto e_inval;
 552                 if (val > 255 || val < -1)
 553                         goto e_inval;
 554                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 555                 retv = 0;
 556                 break;
 557
 558         case IPV6_MULTICAST_LOOP:
 559                 if (optlen < sizeof(int))
 560                         goto e_inval;
 561                 if (val != valbool)
 562                         goto e_inval;
 563                 np->mc_loop = valbool;
 564                 retv = 0;
 565                 break;
 566
 567         case IPV6_UNICAST_IF:
 568         {
 569                 struct net_device *dev = NULL;
 570                 int ifindex;
 571
 572                 if (optlen != sizeof(int))
 573                         goto e_inval;
 574
 575                 ifindex = (__force int)ntohl((__force __be32)val);
 576                 if (ifindex == 0) {
 577                         np->ucast_oif = 0;
 578                         retv = 0;
 579                         break;
 580                 }
 581
 582                 dev = dev_get_by_index(net, ifindex);
 583                 retv = -EADDRNOTAVAIL;
 584                 if (!dev)
 585                         break;
 586                 dev_put(dev);
 587
 588                 retv = -EINVAL;
 589                 if (sk->sk_bound_dev_if)
 590                         break;
 591
 592                 np->ucast_oif = ifindex;
 593                 retv = 0;
 594                 break;
 595         }
 596
 597         case IPV6_MULTICAST_IF:
 598                 if (sk->sk_type == SOCK_STREAM)
 599                         break;
 600                 if (optlen < sizeof(int))
 601                         goto e_inval;
 602
 603                 if (val) {
 604                         struct net_device *dev;
 605                         int midx;
 606
 607                         rcu_read_lock();
 608
 609                         dev = dev_get_by_index_rcu(net, val);
 610                         if (!dev) {
 611                                 rcu_read_unlock();
 612                                 retv = -ENODEV;
 613                                 break;
 614                         }
 615                         midx = l3mdev_master_ifindex_rcu(dev);
 616
 617                         rcu_read_unlock();
 618
 619                         if (sk->sk_bound_dev_if &&
 620                             sk->sk_bound_dev_if != val &&
 621                             (!midx || midx != sk->sk_bound_dev_if))
 622                                 goto e_inval;
 623                 }
 624                 np->mcast_oif = val;
 625                 retv = 0;
 626                 break;
 627         case IPV6_ADD_MEMBERSHIP:
 628         case IPV6_DROP_MEMBERSHIP:
 629         {
 630                 struct ipv6_mreq mreq;
 631
 632                 if (optlen < sizeof(struct ipv6_mreq))
 633                         goto e_inval;
 634
 635                 retv = -EPROTO;
 636                 if (inet_sk(sk)->is_icsk)
 637                         break;
 638
 639                 retv = -EFAULT;
 640                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 641                         break;
 642
 643                 if (optname == IPV6_ADD_MEMBERSHIP)
 644                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 645                 else
 646                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 647                 break;
 648         }
 649         case IPV6_JOIN_ANYCAST:
 650         case IPV6_LEAVE_ANYCAST:
 651         {
 652                 struct ipv6_mreq mreq;
 653
 654                 if (optlen < sizeof(struct ipv6_mreq))
 655                         goto e_inval;
 656
 657                 retv = -EFAULT;
 658                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 659                         break;
 660
 661                 if (optname == IPV6_JOIN_ANYCAST)
 662                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 663                 else
 664                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 665                 break;
 666         }
 667         case MCAST_JOIN_GROUP:
 668         case MCAST_LEAVE_GROUP:
 669         {
 670                 struct group_req greq;
 671                 struct sockaddr_in6 *psin6;
 672
 673                 if (optlen < sizeof(struct group_req))
 674                         goto e_inval;
 675
 676                 retv = -EFAULT;
 677                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 678                         break;
 679                 if (greq.gr_group.ss_family != AF_INET6) {
 680                         retv = -EADDRNOTAVAIL;
 681                         break;
 682                 }
 683                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 684                 if (optname == MCAST_JOIN_GROUP)
 685                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 686                                                  &psin6->sin6_addr);
 687                 else
 688                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 689                                                  &psin6->sin6_addr);
 690                 break;
 691         }
 692         case MCAST_JOIN_SOURCE_GROUP:
 693         case MCAST_LEAVE_SOURCE_GROUP:
 694         case MCAST_BLOCK_SOURCE:
 695         case MCAST_UNBLOCK_SOURCE:
 696         {
 697                 struct group_source_req greqs;
 698                 int omode, add;
 699
 700                 if (optlen < sizeof(struct group_source_req))
 701                         goto e_inval;
 702                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 703                         retv = -EFAULT;
 704                         break;
 705                 }
 706                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 707                     greqs.gsr_source.ss_family != AF_INET6) {
 708                         retv = -EADDRNOTAVAIL;
 709                         break;
 710                 }
 711                 if (optname == MCAST_BLOCK_SOURCE) {
 712                         omode = MCAST_EXCLUDE;
 713                         add = 1;
 714                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 715                         omode = MCAST_EXCLUDE;
 716                         add = 0;
 717                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 718                         struct sockaddr_in6 *psin6;
 719
 720                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 721                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 722                                                  &psin6->sin6_addr);
 723                         /* prior join w/ different source is ok */
 724                         if (retv && retv != -EADDRINUSE)
 725                                 break;
 726                         omode = MCAST_INCLUDE;
 727                         add = 1;
 728                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 729                         omode = MCAST_INCLUDE;
 730                         add = 0;
 731                 }
 732                 retv = ip6_mc_source(add, omode, sk, &greqs);
 733                 break;
 734         }
 735         case MCAST_MSFILTER:
 736         {
 737                 struct group_filter *gsf;
 738
 739                 if (optlen < GROUP_FILTER_SIZE(0))
 740                         goto e_inval;
 741                 if (optlen > sysctl_optmem_max) {
 742                         retv = -ENOBUFS;
 743                         break;
 744                 }
 745                 gsf = memdup_user(optval, optlen);
 746                 if (IS_ERR(gsf)) {
 747                         retv = PTR_ERR(gsf);
 748                         break;
 749                 }
 750                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 751                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 752                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 753                         kfree(gsf);
 754                         retv = -ENOBUFS;
 755                         break;
 756                 }
 757                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 758                         kfree(gsf);
 759                         retv = -EINVAL;
 760                         break;
 761                 }
 762                 retv = ip6_mc_msfilter(sk, gsf);
 763                 kfree(gsf);
 764
 765                 break;
 766         }
 767         case IPV6_ROUTER_ALERT:
 768                 if (optlen < sizeof(int))
 769                         goto e_inval;
 770                 retv = ip6_ra_control(sk, val);
 771                 break;
 772         case IPV6_MTU_DISCOVER:
 773                 if (optlen < sizeof(int))
 774                         goto e_inval;
 775                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 776                         goto e_inval;
 777                 np->pmtudisc = val;
 778                 retv = 0;
 779                 break;
 780         case IPV6_MTU:
 781                 if (optlen < sizeof(int))
 782                         goto e_inval;
 783                 if (val && val < IPV6_MIN_MTU)
 784                         goto e_inval;
 785                 np->frag_size = val;
 786                 retv = 0;
 787                 break;
 788         case IPV6_RECVERR:
 789                 if (optlen < sizeof(int))
 790                         goto e_inval;
 791                 np->recverr = valbool;
 792                 if (!val)
 793                         skb_queue_purge(&sk->sk_error_queue);
 794                 retv = 0;
 795                 break;
 796         case IPV6_FLOWINFO_SEND:
 797                 if (optlen < sizeof(int))
 798                         goto e_inval;
 799                 np->sndflow = valbool;
 800                 retv = 0;
 801                 break;
 802         case IPV6_FLOWLABEL_MGR:
 803                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 804                 break;
 805         case IPV6_IPSEC_POLICY:
 806         case IPV6_XFRM_POLICY:
 807                 retv = -EPERM;
 808                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 809                         break;
 810                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 811                 break;
 812
 813         case IPV6_ADDR_PREFERENCES:
 814             {
 815                 unsigned int pref = 0;
 816                 unsigned int prefmask = ~0;
 817
 818                 if (optlen < sizeof(int))
 819                         goto e_inval;
 820
 821                 retv = -EINVAL;
 822
 823                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 824                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 825                                IPV6_PREFER_SRC_TMP|
 826                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 827                 case IPV6_PREFER_SRC_PUBLIC:
 828                         pref |= IPV6_PREFER_SRC_PUBLIC;
 829                         break;
 830                 case IPV6_PREFER_SRC_TMP:
 831                         pref |= IPV6_PREFER_SRC_TMP;
 832                         break;
 833                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 834                         break;
 835                 case 0:
 836                         goto pref_skip_pubtmp;
 837                 default:
 838                         goto e_inval;
 839                 }
 840
 841                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 842                               IPV6_PREFER_SRC_TMP);
 843 pref_skip_pubtmp:
 844
 845                 /* check HOME/COA conflicts */
 846                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 847                 case IPV6_PREFER_SRC_HOME:
 848                         break;
 849                 case IPV6_PREFER_SRC_COA:
 850                         pref |= IPV6_PREFER_SRC_COA;
 851                 case 0:
 852                         goto pref_skip_coa;
 853                 default:
 854                         goto e_inval;
 855                 }
 856
 857                 prefmask &= ~IPV6_PREFER_SRC_COA;
 858 pref_skip_coa:
 859
 860                 /* check CGA/NONCGA conflicts */
 861                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 862                 case IPV6_PREFER_SRC_CGA:
 863                 case IPV6_PREFER_SRC_NONCGA:
 864                 case 0:
 865                         break;
 866                 default:
 867                         goto e_inval;
 868                 }
 869
 870                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 871                 retv = 0;
 872
 873                 break;
 874             }
 875         case IPV6_MINHOPCOUNT:
 876                 if (optlen < sizeof(int))
 877                         goto e_inval;
 878                 if (val < 0 || val > 255)
 879                         goto e_inval;
 880                 np->min_hopcount = val;
 881                 retv = 0;
 882                 break;
 883         case IPV6_DONTFRAG:
 884                 np->dontfrag = valbool;
 885                 retv = 0;
 886                 break;
 887         case IPV6_AUTOFLOWLABEL:
 888                 np->autoflowlabel = valbool;
 889                 retv = 0;
 890                 break;
 891         case IPV6_RECVFRAGSIZE:
 892                 np->rxopt.bits.recvfragsize = valbool;
 893                 retv = 0;
 894                 break;
 895         }
 896
 897         release_sock(sk);
 898         if (needs_rtnl)
 899                 rtnl_unlock();
 900
 901         return retv;
 902
 903 e_inval:
 904         release_sock(sk);
 905         if (needs_rtnl)
 906                 rtnl_unlock();
 907         return -EINVAL;
 908 }
 909
 910 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 911                     char __user *optval, unsigned int optlen)
 912 {
 913         int err;
 914
 915         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 916                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 917
 918         if (level != SOL_IPV6)
 919                 return -ENOPROTOOPT;
 920
 921         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 922 #ifdef CONFIG_NETFILTER
 923         /* we need to exclude all possible ENOPROTOOPTs except default case */
 924         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 925                         optname != IPV6_XFRM_POLICY) {
 926                 lock_sock(sk);
 927                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 928                                 optlen);
 929                 release_sock(sk);
 930         }
 931 #endif
 932         return err;
 933 }
 934 EXPORT_SYMBOL(ipv6_setsockopt);
 935
 936 #ifdef CONFIG_COMPAT
 937 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 938                            char __user *optval, unsigned int optlen)
 939 {
 940         int err;
 941
 942         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 943                 if (udp_prot.compat_setsockopt != NULL)
 944                         return udp_prot.compat_setsockopt(sk, level, optname,
 945                                                           optval, optlen);
 946                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 947         }
 948
 949         if (level != SOL_IPV6)
 950                 return -ENOPROTOOPT;
 951
 952         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 953                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 954                         ipv6_setsockopt);
 955
 956         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 957 #ifdef CONFIG_NETFILTER
 958         /* we need to exclude all possible ENOPROTOOPTs except default case */
 959         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 960             optname != IPV6_XFRM_POLICY) {
 961                 lock_sock(sk);
 962                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 963                                            optval, optlen);
 964                 release_sock(sk);
 965         }
 966 #endif
 967         return err;
 968 }
 969 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 970 #endif
 971
 972 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 973                                   int optname, char __user *optval, int len)
 974 {
 975         struct ipv6_opt_hdr *hdr;
 976
 977         if (!opt)
 978                 return 0;
 979
 980         switch (optname) {
 981         case IPV6_HOPOPTS:
 982                 hdr = opt->hopopt;
 983                 break;
 984         case IPV6_RTHDRDSTOPTS:
 985                 hdr = opt->dst0opt;
 986                 break;
 987         case IPV6_RTHDR:
 988                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 989                 break;
 990         case IPV6_DSTOPTS:
 991                 hdr = opt->dst1opt;
 992                 break;
 993         default:
 994                 return -EINVAL; /* should not happen */
 995         }
 996
 997         if (!hdr)
 998                 return 0;
 999
1000         len = min_t(unsigned int, len, ipv6_optlen(hdr));
1001         if (copy_to_user(optval, hdr, len))
1002                 return -EFAULT;
1003         return len;
1004 }
1005
1006 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1007                     char __user *optval, int __user *optlen, unsigned int flags)
1008 {
1009         struct ipv6_pinfo *np = inet6_sk(sk);
1010         int len;
1011         int val;
1012
1013         if (ip6_mroute_opt(optname))
1014                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1015
1016         if (get_user(len, optlen))
1017                 return -EFAULT;
1018         switch (optname) {
1019         case IPV6_ADDRFORM:
1020                 if (sk->sk_protocol != IPPROTO_UDP &&
1021                     sk->sk_protocol != IPPROTO_UDPLITE &&
1022                     sk->sk_protocol != IPPROTO_TCP)
1023                         return -ENOPROTOOPT;
1024                 if (sk->sk_state != TCP_ESTABLISHED)
1025                         return -ENOTCONN;
1026                 val = sk->sk_family;
1027                 break;
1028         case MCAST_MSFILTER:
1029         {
1030                 struct group_filter gsf;
1031                 int err;
1032
1033                 if (len < GROUP_FILTER_SIZE(0))
1034                         return -EINVAL;
1035                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1036                         return -EFAULT;
1037                 if (gsf.gf_group.ss_family != AF_INET6)
1038                         return -EADDRNOTAVAIL;
1039                 lock_sock(sk);
1040                 err = ip6_mc_msfget(sk, &gsf,
1041                         (struct group_filter __user *)optval, optlen);
1042                 release_sock(sk);
1043                 return err;
1044         }
1045
1046         case IPV6_2292PKTOPTIONS:
1047         {
1048                 struct msghdr msg;
1049                 struct sk_buff *skb;
1050
1051                 if (sk->sk_type != SOCK_STREAM)
1052                         return -ENOPROTOOPT;
1053
1054                 msg.msg_control = optval;
1055                 msg.msg_controllen = len;
1056                 msg.msg_flags = flags;
1057
1058                 lock_sock(sk);
1059                 skb = np->pktoptions;
1060                 if (skb)
1061                         ip6_datagram_recv_ctl(sk, &msg, skb);
1062                 release_sock(sk);
1063                 if (!skb) {
1064                         if (np->rxopt.bits.rxinfo) {
1065                                 struct in6_pktinfo src_info;
1066                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1067                                         np->sticky_pktinfo.ipi6_ifindex;
1068                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1069                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1070                         }
1071                         if (np->rxopt.bits.rxhlim) {
1072                                 int hlim = np->mcast_hops;
1073                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1074                         }
1075                         if (np->rxopt.bits.rxtclass) {
1076                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1077
1078                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1079                         }
1080                         if (np->rxopt.bits.rxoinfo) {
1081                                 struct in6_pktinfo src_info;
1082                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1083                                         np->sticky_pktinfo.ipi6_ifindex;
1084                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1085                                                                      np->sticky_pktinfo.ipi6_addr;
1086                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1087                         }
1088                         if (np->rxopt.bits.rxohlim) {
1089                                 int hlim = np->mcast_hops;
1090                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1091                         }
1092                         if (np->rxopt.bits.rxflow) {
1093                                 __be32 flowinfo = np->rcv_flowinfo;
1094
1095                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1096                         }
1097                 }
1098                 len -= msg.msg_controllen;
1099                 return put_user(len, optlen);
1100         }
1101         case IPV6_MTU:
1102         {
1103                 struct dst_entry *dst;
1104
1105                 val = 0;
1106                 rcu_read_lock();
1107                 dst = __sk_dst_get(sk);
1108                 if (dst)
1109                         val = dst_mtu(dst);
1110                 rcu_read_unlock();
1111                 if (!val)
1112                         return -ENOTCONN;
1113                 break;
1114         }
1115
1116         case IPV6_V6ONLY:
1117                 val = sk->sk_ipv6only;
1118                 break;
1119
1120         case IPV6_RECVPKTINFO:
1121                 val = np->rxopt.bits.rxinfo;
1122                 break;
1123
1124         case IPV6_2292PKTINFO:
1125                 val = np->rxopt.bits.rxoinfo;
1126                 break;
1127
1128         case IPV6_RECVHOPLIMIT:
1129                 val = np->rxopt.bits.rxhlim;
1130                 break;
1131
1132         case IPV6_2292HOPLIMIT:
1133                 val = np->rxopt.bits.rxohlim;
1134                 break;
1135
1136         case IPV6_RECVRTHDR:
1137                 val = np->rxopt.bits.srcrt;
1138                 break;
1139
1140         case IPV6_2292RTHDR:
1141                 val = np->rxopt.bits.osrcrt;
1142                 break;
1143
1144         case IPV6_HOPOPTS:
1145         case IPV6_RTHDRDSTOPTS:
1146         case IPV6_RTHDR:
1147         case IPV6_DSTOPTS:
1148         {
1149                 struct ipv6_txoptions *opt;
1150
1151                 lock_sock(sk);
1152                 opt = rcu_dereference_protected(np->opt,
1153                                                 lockdep_sock_is_held(sk));
1154                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1155                 release_sock(sk);
1156                 /* check if ipv6_getsockopt_sticky() returns err code */
1157                 if (len < 0)
1158                         return len;
1159                 return put_user(len, optlen);
1160         }
1161
1162         case IPV6_RECVHOPOPTS:
1163                 val = np->rxopt.bits.hopopts;
1164                 break;
1165
1166         case IPV6_2292HOPOPTS:
1167                 val = np->rxopt.bits.ohopopts;
1168                 break;
1169
1170         case IPV6_RECVDSTOPTS:
1171                 val = np->rxopt.bits.dstopts;
1172                 break;
1173
1174         case IPV6_2292DSTOPTS:
1175                 val = np->rxopt.bits.odstopts;
1176                 break;
1177
1178         case IPV6_TCLASS:
1179                 val = np->tclass;
1180                 break;
1181
1182         case IPV6_RECVTCLASS:
1183                 val = np->rxopt.bits.rxtclass;
1184                 break;
1185
1186         case IPV6_FLOWINFO:
1187                 val = np->rxopt.bits.rxflow;
1188                 break;
1189
1190         case IPV6_RECVPATHMTU:
1191                 val = np->rxopt.bits.rxpmtu;
1192                 break;
1193
1194         case IPV6_PATHMTU:
1195         {
1196                 struct dst_entry *dst;
1197                 struct ip6_mtuinfo mtuinfo;
1198
1199                 if (len < sizeof(mtuinfo))
1200                         return -EINVAL;
1201
1202                 len = sizeof(mtuinfo);
1203                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1204
1205                 rcu_read_lock();
1206                 dst = __sk_dst_get(sk);
1207                 if (dst)
1208                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1209                 rcu_read_unlock();
1210                 if (!mtuinfo.ip6m_mtu)
1211                         return -ENOTCONN;
1212
1213                 if (put_user(len, optlen))
1214                         return -EFAULT;
1215                 if (copy_to_user(optval, &mtuinfo, len))
1216                         return -EFAULT;
1217
1218                 return 0;
1219         }
1220
1221         case IPV6_TRANSPARENT:
1222                 val = inet_sk(sk)->transparent;
1223                 break;
1224
1225         case IPV6_FREEBIND:
1226                 val = inet_sk(sk)->freebind;
1227                 break;
1228
1229         case IPV6_RECVORIGDSTADDR:
1230                 val = np->rxopt.bits.rxorigdstaddr;
1231                 break;
1232
1233         case IPV6_UNICAST_HOPS:
1234         case IPV6_MULTICAST_HOPS:
1235         {
1236                 struct dst_entry *dst;
1237
1238                 if (optname == IPV6_UNICAST_HOPS)
1239                         val = np->hop_limit;
1240                 else
1241                         val = np->mcast_hops;
1242
1243                 if (val < 0) {
1244                         rcu_read_lock();
1245                         dst = __sk_dst_get(sk);
1246                         if (dst)
1247                                 val = ip6_dst_hoplimit(dst);
1248                         rcu_read_unlock();
1249                 }
1250
1251                 if (val < 0)
1252                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1253                 break;
1254         }
1255
1256         case IPV6_MULTICAST_LOOP:
1257                 val = np->mc_loop;
1258                 break;
1259
1260         case IPV6_MULTICAST_IF:
1261                 val = np->mcast_oif;
1262                 break;
1263
1264         case IPV6_UNICAST_IF:
1265                 val = (__force int)htonl((__u32) np->ucast_oif);
1266                 break;
1267
1268         case IPV6_MTU_DISCOVER:
1269                 val = np->pmtudisc;
1270                 break;
1271
1272         case IPV6_RECVERR:
1273                 val = np->recverr;
1274                 break;
1275
1276         case IPV6_FLOWINFO_SEND:
1277                 val = np->sndflow;
1278                 break;
1279
1280         case IPV6_FLOWLABEL_MGR:
1281         {
1282                 struct in6_flowlabel_req freq;
1283                 int flags;
1284
1285                 if (len < sizeof(freq))
1286                         return -EINVAL;
1287
1288                 if (copy_from_user(&freq, optval, sizeof(freq)))
1289                         return -EFAULT;
1290
1291                 if (freq.flr_action != IPV6_FL_A_GET)
1292                         return -EINVAL;
1293
1294                 len = sizeof(freq);
1295                 flags = freq.flr_flags;
1296
1297                 memset(&freq, 0, sizeof(freq));
1298
1299                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1300                 if (val < 0)
1301                         return val;
1302
1303                 if (put_user(len, optlen))
1304                         return -EFAULT;
1305                 if (copy_to_user(optval, &freq, len))
1306                         return -EFAULT;
1307
1308                 return 0;
1309         }
1310
1311         case IPV6_ADDR_PREFERENCES:
1312                 val = 0;
1313
1314                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1315                         val |= IPV6_PREFER_SRC_TMP;
1316                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1317                         val |= IPV6_PREFER_SRC_PUBLIC;
1318                 else {
1319                         /* XXX: should we return system default? */
1320                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1321                 }
1322
1323                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1324                         val |= IPV6_PREFER_SRC_COA;
1325                 else
1326                         val |= IPV6_PREFER_SRC_HOME;
1327                 break;
1328
1329         case IPV6_MINHOPCOUNT:
1330                 val = np->min_hopcount;
1331                 break;
1332
1333         case IPV6_DONTFRAG:
1334                 val = np->dontfrag;
1335                 break;
1336
1337         case IPV6_AUTOFLOWLABEL:
1338                 val = np->autoflowlabel;
1339                 break;
1340
1341         case IPV6_RECVFRAGSIZE:
1342                 val = np->rxopt.bits.recvfragsize;
1343                 break;
1344
1345         default:
1346                 return -ENOPROTOOPT;
1347         }
1348         len = min_t(unsigned int, sizeof(int), len);
1349         if (put_user(len, optlen))
1350                 return -EFAULT;
1351         if (copy_to_user(optval, &val, len))
1352                 return -EFAULT;
1353         return 0;
1354 }
1355
1356 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1357                     char __user *optval, int __user *optlen)
1358 {
1359         int err;
1360
1361         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1362                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1363
1364         if (level != SOL_IPV6)
1365                 return -ENOPROTOOPT;
1366
1367         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1368 #ifdef CONFIG_NETFILTER
1369         /* we need to exclude all possible ENOPROTOOPTs except default case */
1370         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1371                 int len;
1372
1373                 if (get_user(len, optlen))
1374                         return -EFAULT;
1375
1376                 lock_sock(sk);
1377                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1378                                 &len);
1379                 release_sock(sk);
1380                 if (err >= 0)
1381                         err = put_user(len, optlen);
1382         }
1383 #endif
1384         return err;
1385 }
1386 EXPORT_SYMBOL(ipv6_getsockopt);
1387
1388 #ifdef CONFIG_COMPAT
1389 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1390                            char __user *optval, int __user *optlen)
1391 {
1392         int err;
1393
1394         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1395                 if (udp_prot.compat_getsockopt != NULL)
1396                         return udp_prot.compat_getsockopt(sk, level, optname,
1397                                                           optval, optlen);
1398                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1399         }
1400
1401         if (level != SOL_IPV6)
1402                 return -ENOPROTOOPT;
1403
1404         if (optname == MCAST_MSFILTER)
1405                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1406                         ipv6_getsockopt);
1407
1408         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1409                                  MSG_CMSG_COMPAT);
1410 #ifdef CONFIG_NETFILTER
1411         /* we need to exclude all possible ENOPROTOOPTs except default case */
1412         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1413                 int len;
1414
1415                 if (get_user(len, optlen))
1416                         return -EFAULT;
1417
1418                 lock_sock(sk);
1419                 err = compat_nf_getsockopt(sk, PF_INET6,
1420                                            optname, optval, &len);
1421                 release_sock(sk);
1422                 if (err >= 0)
1423                         err = put_user(len, optlen);
1424         }
1425 #endif
1426         return err;
1427 }
1428 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1429 #endif
1430