net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  *
  15  *      FIXME: Make the setsockopt code POSIX compliant: That is
  16  *
  17  *      o       Truncate getsockopt returns
  18  *      o       Return an optlen of the truncated length if need be
  19  *
  20  *      Changes:
  21  *      David L Stevens <dlstevens@us.ibm.com>:
  22  *              - added multicast source filtering API for MLDv2
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/capability.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/socket.h>
  30 #include <linux/sockios.h>
  31 #include <linux/net.h>
  32 #include <linux/in6.h>
  33 #include <linux/mroute6.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/init.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/netfilter.h>
  39 #include <linux/slab.h>
  40
  41 #include <net/sock.h>
  42 #include <net/snmp.h>
  43 #include <net/ipv6.h>
  44 #include <net/ndisc.h>
  45 #include <net/protocol.h>
  46 #include <net/transp_v6.h>
  47 #include <net/ip6_route.h>
  48 #include <net/addrconf.h>
  49 #include <net/inet_common.h>
  50 #include <net/tcp.h>
  51 #include <net/udp.h>
  52 #include <net/udplite.h>
  53 #include <net/xfrm.h>
  54 #include <net/compat.h>
  55 #include <net/seg6.h>
  56
  57 #include <linux/uaccess.h>
  58
  59 struct ip6_ra_chain *ip6_ra_chain;
  60 DEFINE_RWLOCK(ip6_ra_lock);
  61
  62 int ip6_ra_control(struct sock *sk, int sel)
  63 {
  64         struct ip6_ra_chain *ra, *new_ra, **rap;
  65
  66         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  67         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  68                 return -ENOPROTOOPT;
  69
  70         new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  71
  72         write_lock_bh(&ip6_ra_lock);
  73         for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
  74                 if (ra->sk == sk) {
  75                         if (sel >= 0) {
  76                                 write_unlock_bh(&ip6_ra_lock);
  77                                 kfree(new_ra);
  78                                 return -EADDRINUSE;
  79                         }
  80
  81                         *rap = ra->next;
  82                         write_unlock_bh(&ip6_ra_lock);
  83
  84                         sock_put(sk);
  85                         kfree(ra);
  86                         return 0;
  87                 }
  88         }
  89         if (!new_ra) {
  90                 write_unlock_bh(&ip6_ra_lock);
  91                 return -ENOBUFS;
  92         }
  93         new_ra->sk = sk;
  94         new_ra->sel = sel;
  95         new_ra->next = ra;
  96         *rap = new_ra;
  97         sock_hold(sk);
  98         write_unlock_bh(&ip6_ra_lock);
  99         return 0;
 100 }
 101
 102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 103                                            struct ipv6_txoptions *opt)
 104 {
 105         if (inet_sk(sk)->is_icsk) {
 106                 if (opt &&
 107                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 108                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 109                         struct inet_connection_sock *icsk = inet_csk(sk);
 110                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 111                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 112                 }
 113         }
 114         opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
 115                    opt);
 116         sk_dst_reset(sk);
 117
 118         return opt;
 119 }
 120
 121 static bool setsockopt_needs_rtnl(int optname)
 122 {
 123         switch (optname) {
 124         case IPV6_ADDRFORM:
 125         case IPV6_ADD_MEMBERSHIP:
 126         case IPV6_DROP_MEMBERSHIP:
 127         case IPV6_JOIN_ANYCAST:
 128         case IPV6_LEAVE_ANYCAST:
 129         case MCAST_JOIN_GROUP:
 130         case MCAST_LEAVE_GROUP:
 131         case MCAST_JOIN_SOURCE_GROUP:
 132         case MCAST_LEAVE_SOURCE_GROUP:
 133         case MCAST_BLOCK_SOURCE:
 134         case MCAST_UNBLOCK_SOURCE:
 135         case MCAST_MSFILTER:
 136                 return true;
 137         }
 138         return false;
 139 }
 140
 141 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 142                     char __user *optval, unsigned int optlen)
 143 {
 144         struct ipv6_pinfo *np = inet6_sk(sk);
 145         struct net *net = sock_net(sk);
 146         int val, valbool;
 147         int retv = -ENOPROTOOPT;
 148         bool needs_rtnl = setsockopt_needs_rtnl(optname);
 149
 150         if (!optval)
 151                 val = 0;
 152         else {
 153                 if (optlen >= sizeof(int)) {
 154                         if (get_user(val, (int __user *) optval))
 155                                 return -EFAULT;
 156                 } else
 157                         val = 0;
 158         }
 159
 160         valbool = (val != 0);
 161
 162         if (ip6_mroute_opt(optname))
 163                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 164
 165         if (needs_rtnl)
 166                 rtnl_lock();
 167         lock_sock(sk);
 168
 169         switch (optname) {
 170
 171         case IPV6_ADDRFORM:
 172                 if (optlen < sizeof(int))
 173                         goto e_inval;
 174                 if (val == PF_INET) {
 175                         struct ipv6_txoptions *opt;
 176                         struct sk_buff *pktopt;
 177
 178                         if (sk->sk_type == SOCK_RAW)
 179                                 break;
 180
 181                         if (sk->sk_protocol == IPPROTO_UDP ||
 182                             sk->sk_protocol == IPPROTO_UDPLITE) {
 183                                 struct udp_sock *up = udp_sk(sk);
 184                                 if (up->pending == AF_INET6) {
 185                                         retv = -EBUSY;
 186                                         break;
 187                                 }
 188                         } else if (sk->sk_protocol != IPPROTO_TCP)
 189                                 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                 struct ipv6_opt_hdr *new = NULL;
 402
 403                 /* hop-by-hop / destination options are privileged option */
 404                 retv = -EPERM;
 405                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 406                         break;
 407
 408                 /* remove any sticky options header with a zero option
 409                  * length, per RFC3542.
 410                  */
 411                 if (optlen == 0)
 412                         optval = NULL;
 413                 else if (!optval)
 414                         goto e_inval;
 415                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 416                          optlen & 0x7 || optlen > 8 * 255)
 417                         goto e_inval;
 418                 else {
 419                         new = memdup_user(optval, optlen);
 420                         if (IS_ERR(new)) {
 421                                 retv = PTR_ERR(new);
 422                                 break;
 423                         }
 424                         if (unlikely(ipv6_optlen(new) > optlen)) {
 425                                 kfree(new);
 426                                 goto e_inval;
 427                         }
 428                 }
 429
 430                 opt = rcu_dereference_protected(np->opt,
 431                                                 lockdep_sock_is_held(sk));
 432                 opt = ipv6_renew_options(sk, opt, optname, new);
 433                 kfree(new);
 434                 if (IS_ERR(opt)) {
 435                         retv = PTR_ERR(opt);
 436                         break;
 437                 }
 438
 439                 /* routing header option needs extra check */
 440                 retv = -EINVAL;
 441                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 442                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 443                         switch (rthdr->type) {
 444 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 445                         case IPV6_SRCRT_TYPE_2:
 446                                 if (rthdr->hdrlen != 2 ||
 447                                     rthdr->segments_left != 1)
 448                                         goto sticky_done;
 449
 450                                 break;
 451 #endif
 452                         case IPV6_SRCRT_TYPE_4:
 453                         {
 454                                 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
 455                                                           opt->srcrt;
 456
 457                                 if (!seg6_validate_srh(srh, optlen))
 458                                         goto sticky_done;
 459                                 break;
 460                         }
 461                         default:
 462                                 goto sticky_done;
 463                         }
 464                 }
 465
 466                 retv = 0;
 467                 opt = ipv6_update_options(sk, opt);
 468 sticky_done:
 469                 if (opt) {
 470                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 471                         txopt_put(opt);
 472                 }
 473                 break;
 474         }
 475
 476         case IPV6_PKTINFO:
 477         {
 478                 struct in6_pktinfo pkt;
 479
 480                 if (optlen == 0)
 481                         goto e_inval;
 482                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 483                         goto e_inval;
 484
 485                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 486                                 retv = -EFAULT;
 487                                 break;
 488                 }
 489                 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
 490                         goto e_inval;
 491
 492                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 493                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 494                 retv = 0;
 495                 break;
 496         }
 497
 498         case IPV6_2292PKTOPTIONS:
 499         {
 500                 struct ipv6_txoptions *opt = NULL;
 501                 struct msghdr msg;
 502                 struct flowi6 fl6;
 503                 struct ipcm6_cookie ipc6;
 504
 505                 memset(&fl6, 0, sizeof(fl6));
 506                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 507                 fl6.flowi6_mark = sk->sk_mark;
 508
 509                 if (optlen == 0)
 510                         goto update;
 511
 512                 /* 1K is probably excessive
 513                  * 1K is surely not enough, 2K per standard header is 16K.
 514                  */
 515                 retv = -EINVAL;
 516                 if (optlen > 64*1024)
 517                         break;
 518
 519                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 520                 retv = -ENOBUFS;
 521                 if (!opt)
 522                         break;
 523
 524                 memset(opt, 0, sizeof(*opt));
 525                 refcount_set(&opt->refcnt, 1);
 526                 opt->tot_len = sizeof(*opt) + optlen;
 527                 retv = -EFAULT;
 528                 if (copy_from_user(opt+1, optval, optlen))
 529                         goto done;
 530
 531                 msg.msg_controllen = optlen;
 532                 msg.msg_control = (void *)(opt+1);
 533                 ipc6.opt = opt;
 534
 535                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
 536                 if (retv)
 537                         goto done;
 538 update:
 539                 retv = 0;
 540                 opt = ipv6_update_options(sk, opt);
 541 done:
 542                 if (opt) {
 543                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 544                         txopt_put(opt);
 545                 }
 546                 break;
 547         }
 548         case IPV6_UNICAST_HOPS:
 549                 if (optlen < sizeof(int))
 550                         goto e_inval;
 551                 if (val > 255 || val < -1)
 552                         goto e_inval;
 553                 np->hop_limit = val;
 554                 retv = 0;
 555                 break;
 556
 557         case IPV6_MULTICAST_HOPS:
 558                 if (sk->sk_type == SOCK_STREAM)
 559                         break;
 560                 if (optlen < sizeof(int))
 561                         goto e_inval;
 562                 if (val > 255 || val < -1)
 563                         goto e_inval;
 564                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 565                 retv = 0;
 566                 break;
 567
 568         case IPV6_MULTICAST_LOOP:
 569                 if (optlen < sizeof(int))
 570                         goto e_inval;
 571                 if (val != valbool)
 572                         goto e_inval;
 573                 np->mc_loop = valbool;
 574                 retv = 0;
 575                 break;
 576
 577         case IPV6_UNICAST_IF:
 578         {
 579                 struct net_device *dev = NULL;
 580                 int ifindex;
 581
 582                 if (optlen != sizeof(int))
 583                         goto e_inval;
 584
 585                 ifindex = (__force int)ntohl((__force __be32)val);
 586                 if (ifindex == 0) {
 587                         np->ucast_oif = 0;
 588                         retv = 0;
 589                         break;
 590                 }
 591
 592                 dev = dev_get_by_index(net, ifindex);
 593                 retv = -EADDRNOTAVAIL;
 594                 if (!dev)
 595                         break;
 596                 dev_put(dev);
 597
 598                 retv = -EINVAL;
 599                 if (sk->sk_bound_dev_if)
 600                         break;
 601
 602                 np->ucast_oif = ifindex;
 603                 retv = 0;
 604                 break;
 605         }
 606
 607         case IPV6_MULTICAST_IF:
 608                 if (sk->sk_type == SOCK_STREAM)
 609                         break;
 610                 if (optlen < sizeof(int))
 611                         goto e_inval;
 612
 613                 if (val) {
 614                         struct net_device *dev;
 615                         int midx;
 616
 617                         rcu_read_lock();
 618
 619                         dev = dev_get_by_index_rcu(net, val);
 620                         if (!dev) {
 621                                 rcu_read_unlock();
 622                                 retv = -ENODEV;
 623                                 break;
 624                         }
 625                         midx = l3mdev_master_ifindex_rcu(dev);
 626
 627                         rcu_read_unlock();
 628
 629                         if (sk->sk_bound_dev_if &&
 630                             sk->sk_bound_dev_if != val &&
 631                             (!midx || midx != sk->sk_bound_dev_if))
 632                                 goto e_inval;
 633                 }
 634                 np->mcast_oif = val;
 635                 retv = 0;
 636                 break;
 637         case IPV6_ADD_MEMBERSHIP:
 638         case IPV6_DROP_MEMBERSHIP:
 639         {
 640                 struct ipv6_mreq mreq;
 641
 642                 if (optlen < sizeof(struct ipv6_mreq))
 643                         goto e_inval;
 644
 645                 retv = -EPROTO;
 646                 if (inet_sk(sk)->is_icsk)
 647                         break;
 648
 649                 retv = -EFAULT;
 650                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 651                         break;
 652
 653                 if (optname == IPV6_ADD_MEMBERSHIP)
 654                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 655                 else
 656                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 657                 break;
 658         }
 659         case IPV6_JOIN_ANYCAST:
 660         case IPV6_LEAVE_ANYCAST:
 661         {
 662                 struct ipv6_mreq mreq;
 663
 664                 if (optlen < sizeof(struct ipv6_mreq))
 665                         goto e_inval;
 666
 667                 retv = -EFAULT;
 668                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 669                         break;
 670
 671                 if (optname == IPV6_JOIN_ANYCAST)
 672                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 673                 else
 674                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 675                 break;
 676         }
 677         case IPV6_MULTICAST_ALL:
 678                 if (optlen < sizeof(int))
 679                         goto e_inval;
 680                 np->mc_all = valbool;
 681                 retv = 0;
 682                 break;
 683
 684         case MCAST_JOIN_GROUP:
 685         case MCAST_LEAVE_GROUP:
 686         {
 687                 struct group_req greq;
 688                 struct sockaddr_in6 *psin6;
 689
 690                 if (optlen < sizeof(struct group_req))
 691                         goto e_inval;
 692
 693                 retv = -EFAULT;
 694                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 695                         break;
 696                 if (greq.gr_group.ss_family != AF_INET6) {
 697                         retv = -EADDRNOTAVAIL;
 698                         break;
 699                 }
 700                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 701                 if (optname == MCAST_JOIN_GROUP)
 702                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 703                                                  &psin6->sin6_addr);
 704                 else
 705                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 706                                                  &psin6->sin6_addr);
 707                 break;
 708         }
 709         case MCAST_JOIN_SOURCE_GROUP:
 710         case MCAST_LEAVE_SOURCE_GROUP:
 711         case MCAST_BLOCK_SOURCE:
 712         case MCAST_UNBLOCK_SOURCE:
 713         {
 714                 struct group_source_req greqs;
 715                 int omode, add;
 716
 717                 if (optlen < sizeof(struct group_source_req))
 718                         goto e_inval;
 719                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 720                         retv = -EFAULT;
 721                         break;
 722                 }
 723                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 724                     greqs.gsr_source.ss_family != AF_INET6) {
 725                         retv = -EADDRNOTAVAIL;
 726                         break;
 727                 }
 728                 if (optname == MCAST_BLOCK_SOURCE) {
 729                         omode = MCAST_EXCLUDE;
 730                         add = 1;
 731                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 732                         omode = MCAST_EXCLUDE;
 733                         add = 0;
 734                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 735                         struct sockaddr_in6 *psin6;
 736
 737                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 738                         retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
 739                                                      &psin6->sin6_addr,
 740                                                      MCAST_INCLUDE);
 741                         /* prior join w/ different source is ok */
 742                         if (retv && retv != -EADDRINUSE)
 743                                 break;
 744                         omode = MCAST_INCLUDE;
 745                         add = 1;
 746                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 747                         omode = MCAST_INCLUDE;
 748                         add = 0;
 749                 }
 750                 retv = ip6_mc_source(add, omode, sk, &greqs);
 751                 break;
 752         }
 753         case MCAST_MSFILTER:
 754         {
 755                 struct group_filter *gsf;
 756
 757                 if (optlen < GROUP_FILTER_SIZE(0))
 758                         goto e_inval;
 759                 if (optlen > sysctl_optmem_max) {
 760                         retv = -ENOBUFS;
 761                         break;
 762                 }
 763                 gsf = memdup_user(optval, optlen);
 764                 if (IS_ERR(gsf)) {
 765                         retv = PTR_ERR(gsf);
 766                         break;
 767                 }
 768                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 769                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 770                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 771                         kfree(gsf);
 772                         retv = -ENOBUFS;
 773                         break;
 774                 }
 775                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 776                         kfree(gsf);
 777                         retv = -EINVAL;
 778                         break;
 779                 }
 780                 retv = ip6_mc_msfilter(sk, gsf);
 781                 kfree(gsf);
 782
 783                 break;
 784         }
 785         case IPV6_ROUTER_ALERT:
 786                 if (optlen < sizeof(int))
 787                         goto e_inval;
 788                 retv = ip6_ra_control(sk, val);
 789                 break;
 790         case IPV6_MTU_DISCOVER:
 791                 if (optlen < sizeof(int))
 792                         goto e_inval;
 793                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 794                         goto e_inval;
 795                 np->pmtudisc = val;
 796                 retv = 0;
 797                 break;
 798         case IPV6_MTU:
 799                 if (optlen < sizeof(int))
 800                         goto e_inval;
 801                 if (val && val < IPV6_MIN_MTU)
 802                         goto e_inval;
 803                 np->frag_size = val;
 804                 retv = 0;
 805                 break;
 806         case IPV6_RECVERR:
 807                 if (optlen < sizeof(int))
 808                         goto e_inval;
 809                 np->recverr = valbool;
 810                 if (!val)
 811                         skb_queue_purge(&sk->sk_error_queue);
 812                 retv = 0;
 813                 break;
 814         case IPV6_FLOWINFO_SEND:
 815                 if (optlen < sizeof(int))
 816                         goto e_inval;
 817                 np->sndflow = valbool;
 818                 retv = 0;
 819                 break;
 820         case IPV6_FLOWLABEL_MGR:
 821                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 822                 break;
 823         case IPV6_IPSEC_POLICY:
 824         case IPV6_XFRM_POLICY:
 825                 retv = -EPERM;
 826                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 827                         break;
 828                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 829                 break;
 830
 831         case IPV6_ADDR_PREFERENCES:
 832             {
 833                 unsigned int pref = 0;
 834                 unsigned int prefmask = ~0;
 835
 836                 if (optlen < sizeof(int))
 837                         goto e_inval;
 838
 839                 retv = -EINVAL;
 840
 841                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 842                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 843                                IPV6_PREFER_SRC_TMP|
 844                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 845                 case IPV6_PREFER_SRC_PUBLIC:
 846                         pref |= IPV6_PREFER_SRC_PUBLIC;
 847                         break;
 848                 case IPV6_PREFER_SRC_TMP:
 849                         pref |= IPV6_PREFER_SRC_TMP;
 850                         break;
 851                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 852                         break;
 853                 case 0:
 854                         goto pref_skip_pubtmp;
 855                 default:
 856                         goto e_inval;
 857                 }
 858
 859                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 860                               IPV6_PREFER_SRC_TMP);
 861 pref_skip_pubtmp:
 862
 863                 /* check HOME/COA conflicts */
 864                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 865                 case IPV6_PREFER_SRC_HOME:
 866                         break;
 867                 case IPV6_PREFER_SRC_COA:
 868                         pref |= IPV6_PREFER_SRC_COA;
 869                 case 0:
 870                         goto pref_skip_coa;
 871                 default:
 872                         goto e_inval;
 873                 }
 874
 875                 prefmask &= ~IPV6_PREFER_SRC_COA;
 876 pref_skip_coa:
 877
 878                 /* check CGA/NONCGA conflicts */
 879                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 880                 case IPV6_PREFER_SRC_CGA:
 881                 case IPV6_PREFER_SRC_NONCGA:
 882                 case 0:
 883                         break;
 884                 default:
 885                         goto e_inval;
 886                 }
 887
 888                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 889                 retv = 0;
 890
 891                 break;
 892             }
 893         case IPV6_MINHOPCOUNT:
 894                 if (optlen < sizeof(int))
 895                         goto e_inval;
 896                 if (val < 0 || val > 255)
 897                         goto e_inval;
 898                 np->min_hopcount = val;
 899                 retv = 0;
 900                 break;
 901         case IPV6_DONTFRAG:
 902                 np->dontfrag = valbool;
 903                 retv = 0;
 904                 break;
 905         case IPV6_AUTOFLOWLABEL:
 906                 np->autoflowlabel = valbool;
 907                 np->autoflowlabel_set = 1;
 908                 retv = 0;
 909                 break;
 910         case IPV6_RECVFRAGSIZE:
 911                 np->rxopt.bits.recvfragsize = valbool;
 912                 retv = 0;
 913                 break;
 914         }
 915
 916         release_sock(sk);
 917         if (needs_rtnl)
 918                 rtnl_unlock();
 919
 920         return retv;
 921
 922 e_inval:
 923         release_sock(sk);
 924         if (needs_rtnl)
 925                 rtnl_unlock();
 926         return -EINVAL;
 927 }
 928
 929 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 930                     char __user *optval, unsigned int optlen)
 931 {
 932         int err;
 933
 934         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 935                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 936
 937         if (level != SOL_IPV6)
 938                 return -ENOPROTOOPT;
 939
 940         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 941 #ifdef CONFIG_NETFILTER
 942         /* we need to exclude all possible ENOPROTOOPTs except default case */
 943         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 944                         optname != IPV6_XFRM_POLICY)
 945                 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
 946 #endif
 947         return err;
 948 }
 949 EXPORT_SYMBOL(ipv6_setsockopt);
 950
 951 #ifdef CONFIG_COMPAT
 952 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 953                            char __user *optval, unsigned int optlen)
 954 {
 955         int err;
 956
 957         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 958                 if (udp_prot.compat_setsockopt != NULL)
 959                         return udp_prot.compat_setsockopt(sk, level, optname,
 960                                                           optval, optlen);
 961                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 962         }
 963
 964         if (level != SOL_IPV6)
 965                 return -ENOPROTOOPT;
 966
 967         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 968                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 969                         ipv6_setsockopt);
 970
 971         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 972 #ifdef CONFIG_NETFILTER
 973         /* we need to exclude all possible ENOPROTOOPTs except default case */
 974         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 975             optname != IPV6_XFRM_POLICY)
 976                 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
 977                                            optlen);
 978 #endif
 979         return err;
 980 }
 981 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 982 #endif
 983
 984 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 985                                   int optname, char __user *optval, int len)
 986 {
 987         struct ipv6_opt_hdr *hdr;
 988
 989         if (!opt)
 990                 return 0;
 991
 992         switch (optname) {
 993         case IPV6_HOPOPTS:
 994                 hdr = opt->hopopt;
 995                 break;
 996         case IPV6_RTHDRDSTOPTS:
 997                 hdr = opt->dst0opt;
 998                 break;
 999         case IPV6_RTHDR:
1000                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1001                 break;
1002         case IPV6_DSTOPTS:
1003                 hdr = opt->dst1opt;
1004                 break;
1005         default:
1006                 return -EINVAL; /* should not happen */
1007         }
1008
1009         if (!hdr)
1010                 return 0;
1011
1012         len = min_t(unsigned int, len, ipv6_optlen(hdr));
1013         if (copy_to_user(optval, hdr, len))
1014                 return -EFAULT;
1015         return len;
1016 }
1017
1018 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1019                     char __user *optval, int __user *optlen, unsigned int flags)
1020 {
1021         struct ipv6_pinfo *np = inet6_sk(sk);
1022         int len;
1023         int val;
1024
1025         if (ip6_mroute_opt(optname))
1026                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1027
1028         if (get_user(len, optlen))
1029                 return -EFAULT;
1030         switch (optname) {
1031         case IPV6_ADDRFORM:
1032                 if (sk->sk_protocol != IPPROTO_UDP &&
1033                     sk->sk_protocol != IPPROTO_UDPLITE &&
1034                     sk->sk_protocol != IPPROTO_TCP)
1035                         return -ENOPROTOOPT;
1036                 if (sk->sk_state != TCP_ESTABLISHED)
1037                         return -ENOTCONN;
1038                 val = sk->sk_family;
1039                 break;
1040         case MCAST_MSFILTER:
1041         {
1042                 struct group_filter gsf;
1043                 int err;
1044
1045                 if (len < GROUP_FILTER_SIZE(0))
1046                         return -EINVAL;
1047                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1048                         return -EFAULT;
1049                 if (gsf.gf_group.ss_family != AF_INET6)
1050                         return -EADDRNOTAVAIL;
1051                 lock_sock(sk);
1052                 err = ip6_mc_msfget(sk, &gsf,
1053                         (struct group_filter __user *)optval, optlen);
1054                 release_sock(sk);
1055                 return err;
1056         }
1057
1058         case IPV6_2292PKTOPTIONS:
1059         {
1060                 struct msghdr msg;
1061                 struct sk_buff *skb;
1062
1063                 if (sk->sk_type != SOCK_STREAM)
1064                         return -ENOPROTOOPT;
1065
1066                 msg.msg_control = optval;
1067                 msg.msg_controllen = len;
1068                 msg.msg_flags = flags;
1069
1070                 lock_sock(sk);
1071                 skb = np->pktoptions;
1072                 if (skb)
1073                         ip6_datagram_recv_ctl(sk, &msg, skb);
1074                 release_sock(sk);
1075                 if (!skb) {
1076                         if (np->rxopt.bits.rxinfo) {
1077                                 struct in6_pktinfo src_info;
1078                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1079                                         np->sticky_pktinfo.ipi6_ifindex;
1080                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1081                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1082                         }
1083                         if (np->rxopt.bits.rxhlim) {
1084                                 int hlim = np->mcast_hops;
1085                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1086                         }
1087                         if (np->rxopt.bits.rxtclass) {
1088                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1089
1090                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1091                         }
1092                         if (np->rxopt.bits.rxoinfo) {
1093                                 struct in6_pktinfo src_info;
1094                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1095                                         np->sticky_pktinfo.ipi6_ifindex;
1096                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1097                                                                      np->sticky_pktinfo.ipi6_addr;
1098                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1099                         }
1100                         if (np->rxopt.bits.rxohlim) {
1101                                 int hlim = np->mcast_hops;
1102                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1103                         }
1104                         if (np->rxopt.bits.rxflow) {
1105                                 __be32 flowinfo = np->rcv_flowinfo;
1106
1107                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1108                         }
1109                 }
1110                 len -= msg.msg_controllen;
1111                 return put_user(len, optlen);
1112         }
1113         case IPV6_MTU:
1114         {
1115                 struct dst_entry *dst;
1116
1117                 val = 0;
1118                 rcu_read_lock();
1119                 dst = __sk_dst_get(sk);
1120                 if (dst)
1121                         val = dst_mtu(dst);
1122                 rcu_read_unlock();
1123                 if (!val)
1124                         return -ENOTCONN;
1125                 break;
1126         }
1127
1128         case IPV6_V6ONLY:
1129                 val = sk->sk_ipv6only;
1130                 break;
1131
1132         case IPV6_RECVPKTINFO:
1133                 val = np->rxopt.bits.rxinfo;
1134                 break;
1135
1136         case IPV6_2292PKTINFO:
1137                 val = np->rxopt.bits.rxoinfo;
1138                 break;
1139
1140         case IPV6_RECVHOPLIMIT:
1141                 val = np->rxopt.bits.rxhlim;
1142                 break;
1143
1144         case IPV6_2292HOPLIMIT:
1145                 val = np->rxopt.bits.rxohlim;
1146                 break;
1147
1148         case IPV6_RECVRTHDR:
1149                 val = np->rxopt.bits.srcrt;
1150                 break;
1151
1152         case IPV6_2292RTHDR:
1153                 val = np->rxopt.bits.osrcrt;
1154                 break;
1155
1156         case IPV6_HOPOPTS:
1157         case IPV6_RTHDRDSTOPTS:
1158         case IPV6_RTHDR:
1159         case IPV6_DSTOPTS:
1160         {
1161                 struct ipv6_txoptions *opt;
1162
1163                 lock_sock(sk);
1164                 opt = rcu_dereference_protected(np->opt,
1165                                                 lockdep_sock_is_held(sk));
1166                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1167                 release_sock(sk);
1168                 /* check if ipv6_getsockopt_sticky() returns err code */
1169                 if (len < 0)
1170                         return len;
1171                 return put_user(len, optlen);
1172         }
1173
1174         case IPV6_RECVHOPOPTS:
1175                 val = np->rxopt.bits.hopopts;
1176                 break;
1177
1178         case IPV6_2292HOPOPTS:
1179                 val = np->rxopt.bits.ohopopts;
1180                 break;
1181
1182         case IPV6_RECVDSTOPTS:
1183                 val = np->rxopt.bits.dstopts;
1184                 break;
1185
1186         case IPV6_2292DSTOPTS:
1187                 val = np->rxopt.bits.odstopts;
1188                 break;
1189
1190         case IPV6_TCLASS:
1191                 val = np->tclass;
1192                 break;
1193
1194         case IPV6_RECVTCLASS:
1195                 val = np->rxopt.bits.rxtclass;
1196                 break;
1197
1198         case IPV6_FLOWINFO:
1199                 val = np->rxopt.bits.rxflow;
1200                 break;
1201
1202         case IPV6_RECVPATHMTU:
1203                 val = np->rxopt.bits.rxpmtu;
1204                 break;
1205
1206         case IPV6_PATHMTU:
1207         {
1208                 struct dst_entry *dst;
1209                 struct ip6_mtuinfo mtuinfo;
1210
1211                 if (len < sizeof(mtuinfo))
1212                         return -EINVAL;
1213
1214                 len = sizeof(mtuinfo);
1215                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1216
1217                 rcu_read_lock();
1218                 dst = __sk_dst_get(sk);
1219                 if (dst)
1220                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1221                 rcu_read_unlock();
1222                 if (!mtuinfo.ip6m_mtu)
1223                         return -ENOTCONN;
1224
1225                 if (put_user(len, optlen))
1226                         return -EFAULT;
1227                 if (copy_to_user(optval, &mtuinfo, len))
1228                         return -EFAULT;
1229
1230                 return 0;
1231         }
1232
1233         case IPV6_TRANSPARENT:
1234                 val = inet_sk(sk)->transparent;
1235                 break;
1236
1237         case IPV6_FREEBIND:
1238                 val = inet_sk(sk)->freebind;
1239                 break;
1240
1241         case IPV6_RECVORIGDSTADDR:
1242                 val = np->rxopt.bits.rxorigdstaddr;
1243                 break;
1244
1245         case IPV6_UNICAST_HOPS:
1246         case IPV6_MULTICAST_HOPS:
1247         {
1248                 struct dst_entry *dst;
1249
1250                 if (optname == IPV6_UNICAST_HOPS)
1251                         val = np->hop_limit;
1252                 else
1253                         val = np->mcast_hops;
1254
1255                 if (val < 0) {
1256                         rcu_read_lock();
1257                         dst = __sk_dst_get(sk);
1258                         if (dst)
1259                                 val = ip6_dst_hoplimit(dst);
1260                         rcu_read_unlock();
1261                 }
1262
1263                 if (val < 0)
1264                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1265                 break;
1266         }
1267
1268         case IPV6_MULTICAST_LOOP:
1269                 val = np->mc_loop;
1270                 break;
1271
1272         case IPV6_MULTICAST_IF:
1273                 val = np->mcast_oif;
1274                 break;
1275
1276         case IPV6_MULTICAST_ALL:
1277                 val = np->mc_all;
1278                 break;
1279
1280         case IPV6_UNICAST_IF:
1281                 val = (__force int)htonl((__u32) np->ucast_oif);
1282                 break;
1283
1284         case IPV6_MTU_DISCOVER:
1285                 val = np->pmtudisc;
1286                 break;
1287
1288         case IPV6_RECVERR:
1289                 val = np->recverr;
1290                 break;
1291
1292         case IPV6_FLOWINFO_SEND:
1293                 val = np->sndflow;
1294                 break;
1295
1296         case IPV6_FLOWLABEL_MGR:
1297         {
1298                 struct in6_flowlabel_req freq;
1299                 int flags;
1300
1301                 if (len < sizeof(freq))
1302                         return -EINVAL;
1303
1304                 if (copy_from_user(&freq, optval, sizeof(freq)))
1305                         return -EFAULT;
1306
1307                 if (freq.flr_action != IPV6_FL_A_GET)
1308                         return -EINVAL;
1309
1310                 len = sizeof(freq);
1311                 flags = freq.flr_flags;
1312
1313                 memset(&freq, 0, sizeof(freq));
1314
1315                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1316                 if (val < 0)
1317                         return val;
1318
1319                 if (put_user(len, optlen))
1320                         return -EFAULT;
1321                 if (copy_to_user(optval, &freq, len))
1322                         return -EFAULT;
1323
1324                 return 0;
1325         }
1326
1327         case IPV6_ADDR_PREFERENCES:
1328                 val = 0;
1329
1330                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1331                         val |= IPV6_PREFER_SRC_TMP;
1332                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1333                         val |= IPV6_PREFER_SRC_PUBLIC;
1334                 else {
1335                         /* XXX: should we return system default? */
1336                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1337                 }
1338
1339                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1340                         val |= IPV6_PREFER_SRC_COA;
1341                 else
1342                         val |= IPV6_PREFER_SRC_HOME;
1343                 break;
1344
1345         case IPV6_MINHOPCOUNT:
1346                 val = np->min_hopcount;
1347                 break;
1348
1349         case IPV6_DONTFRAG:
1350                 val = np->dontfrag;
1351                 break;
1352
1353         case IPV6_AUTOFLOWLABEL:
1354                 val = ip6_autoflowlabel(sock_net(sk), np);
1355                 break;
1356
1357         case IPV6_RECVFRAGSIZE:
1358                 val = np->rxopt.bits.recvfragsize;
1359                 break;
1360
1361         default:
1362                 return -ENOPROTOOPT;
1363         }
1364         len = min_t(unsigned int, sizeof(int), len);
1365         if (put_user(len, optlen))
1366                 return -EFAULT;
1367         if (copy_to_user(optval, &val, len))
1368                 return -EFAULT;
1369         return 0;
1370 }
1371
1372 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1373                     char __user *optval, int __user *optlen)
1374 {
1375         int err;
1376
1377         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1378                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1379
1380         if (level != SOL_IPV6)
1381                 return -ENOPROTOOPT;
1382
1383         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1384 #ifdef CONFIG_NETFILTER
1385         /* we need to exclude all possible ENOPROTOOPTs except default case */
1386         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1387                 int len;
1388
1389                 if (get_user(len, optlen))
1390                         return -EFAULT;
1391
1392                 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1393                 if (err >= 0)
1394                         err = put_user(len, optlen);
1395         }
1396 #endif
1397         return err;
1398 }
1399 EXPORT_SYMBOL(ipv6_getsockopt);
1400
1401 #ifdef CONFIG_COMPAT
1402 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1403                            char __user *optval, int __user *optlen)
1404 {
1405         int err;
1406
1407         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1408                 if (udp_prot.compat_getsockopt != NULL)
1409                         return udp_prot.compat_getsockopt(sk, level, optname,
1410                                                           optval, optlen);
1411                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1412         }
1413
1414         if (level != SOL_IPV6)
1415                 return -ENOPROTOOPT;
1416
1417         if (optname == MCAST_MSFILTER)
1418                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1419                         ipv6_getsockopt);
1420
1421         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1422                                  MSG_CMSG_COMPAT);
1423 #ifdef CONFIG_NETFILTER
1424         /* we need to exclude all possible ENOPROTOOPTs except default case */
1425         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1426                 int len;
1427
1428                 if (get_user(len, optlen))
1429                         return -EFAULT;
1430
1431                 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1432                 if (err >= 0)
1433                         err = put_user(len, optlen);
1434         }
1435 #endif
1436         return err;
1437 }
1438 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1439 #endif