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