net/ipv6/ipv6_sockglue.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      IPv6 BSD socket options interface
   4  *      Linux INET6 implementation
   5  *
   6  *      Authors:
   7  *      Pedro Roque             <roque@di.fc.ul.pt>
   8  *
   9  *      Based on linux/net/ipv4/ip_sockglue.c
  10  *
  11  *      FIXME: Make the setsockopt code POSIX compliant: That is
  12  *
  13  *      o       Truncate getsockopt returns
  14  *      o       Return an optlen of the truncated length if need be
  15  *
  16  *      Changes:
  17  *      David L Stevens <dlstevens@us.ibm.com>:
  18  *              - added multicast source filtering API for MLDv2
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/capability.h>
  23 #include <linux/errno.h>
  24 #include <linux/types.h>
  25 #include <linux/socket.h>
  26 #include <linux/sockios.h>
  27 #include <linux/net.h>
  28 #include <linux/in6.h>
  29 #include <linux/mroute6.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/if_arp.h>
  32 #include <linux/init.h>
  33 #include <linux/sysctl.h>
  34 #include <linux/netfilter.h>
  35 #include <linux/slab.h>
  36
  37 #include <net/sock.h>
  38 #include <net/snmp.h>
  39 #include <net/ipv6.h>
  40 #include <net/ndisc.h>
  41 #include <net/protocol.h>
  42 #include <net/transp_v6.h>
  43 #include <net/ip6_route.h>
  44 #include <net/addrconf.h>
  45 #include <net/inet_common.h>
  46 #include <net/tcp.h>
  47 #include <net/udp.h>
  48 #include <net/udplite.h>
  49 #include <net/xfrm.h>
  50 #include <net/compat.h>
  51 #include <net/seg6.h>
  52
  53 #include <linux/uaccess.h>
  54
  55 struct ip6_ra_chain *ip6_ra_chain;
  56 DEFINE_RWLOCK(ip6_ra_lock);
  57
  58 int ip6_ra_control(struct sock *sk, int sel)
  59 {
  60         struct ip6_ra_chain *ra, *new_ra, **rap;
  61
  62         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  63         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  64                 return -ENOPROTOOPT;
  65
  66         new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  67         if (sel >= 0 && !new_ra)
  68                 return -ENOMEM;
  69
  70         write_lock_bh(&ip6_ra_lock);
  71         for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
  72                 if (ra->sk == sk) {
  73                         if (sel >= 0) {
  74                                 write_unlock_bh(&ip6_ra_lock);
  75                                 kfree(new_ra);
  76                                 return -EADDRINUSE;
  77                         }
  78
  79                         *rap = ra->next;
  80                         write_unlock_bh(&ip6_ra_lock);
  81
  82                         sock_put(sk);
  83                         kfree(ra);
  84                         return 0;
  85                 }
  86         }
  87         if (!new_ra) {
  88                 write_unlock_bh(&ip6_ra_lock);
  89                 return -ENOBUFS;
  90         }
  91         new_ra->sk = sk;
  92         new_ra->sel = sel;
  93         new_ra->next = ra;
  94         *rap = new_ra;
  95         sock_hold(sk);
  96         write_unlock_bh(&ip6_ra_lock);
  97         return 0;
  98 }
  99
 100 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 101                                            struct ipv6_txoptions *opt)
 102 {
 103         if (inet_sk(sk)->is_icsk) {
 104                 if (opt &&
 105                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 106                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 107                         struct inet_connection_sock *icsk = inet_csk(sk);
 108                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 109                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 110                 }
 111         }
 112         opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
 113                    opt);
 114         sk_dst_reset(sk);
 115
 116         return opt;
 117 }
 118
 119 static bool setsockopt_needs_rtnl(int optname)
 120 {
 121         switch (optname) {
 122         case IPV6_ADDRFORM:
 123         case IPV6_ADD_MEMBERSHIP:
 124         case IPV6_DROP_MEMBERSHIP:
 125         case IPV6_JOIN_ANYCAST:
 126         case IPV6_LEAVE_ANYCAST:
 127         case MCAST_JOIN_GROUP:
 128         case MCAST_LEAVE_GROUP:
 129         case MCAST_JOIN_SOURCE_GROUP:
 130         case MCAST_LEAVE_SOURCE_GROUP:
 131         case MCAST_BLOCK_SOURCE:
 132         case MCAST_UNBLOCK_SOURCE:
 133         case MCAST_MSFILTER:
 134                 return true;
 135         }
 136         return false;
 137 }
 138
 139 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 140                     char __user *optval, unsigned int optlen)
 141 {
 142         struct ipv6_pinfo *np = inet6_sk(sk);
 143         struct net *net = sock_net(sk);
 144         int val, valbool;
 145         int retv = -ENOPROTOOPT;
 146         bool needs_rtnl = setsockopt_needs_rtnl(optname);
 147
 148         if (!optval)
 149                 val = 0;
 150         else {
 151                 if (optlen >= sizeof(int)) {
 152                         if (get_user(val, (int __user *) optval))
 153                                 return -EFAULT;
 154                 } else
 155                         val = 0;
 156         }
 157
 158         valbool = (val != 0);
 159
 160         if (ip6_mroute_opt(optname))
 161                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 162
 163         if (needs_rtnl)
 164                 rtnl_lock();
 165         lock_sock(sk);
 166
 167         switch (optname) {
 168
 169         case IPV6_ADDRFORM:
 170                 if (optlen < sizeof(int))
 171                         goto e_inval;
 172                 if (val == PF_INET) {
 173                         struct ipv6_txoptions *opt;
 174                         struct sk_buff *pktopt;
 175
 176                         if (sk->sk_type == SOCK_RAW)
 177                                 break;
 178
 179                         if (sk->sk_protocol == IPPROTO_UDP ||
 180                             sk->sk_protocol == IPPROTO_UDPLITE) {
 181                                 struct udp_sock *up = udp_sk(sk);
 182                                 if (up->pending == AF_INET6) {
 183                                         retv = -EBUSY;
 184                                         break;
 185                                 }
 186                         } else if (sk->sk_protocol == IPPROTO_TCP) {
 187                                 if (sk->sk_prot != &tcpv6_prot) {
 188                                         retv = -EBUSY;
 189                                         break;
 190                                 }
 191                         } else {
 192                                 break;
 193                         }
 194
 195                         if (sk->sk_state != TCP_ESTABLISHED) {
 196                                 retv = -ENOTCONN;
 197                                 break;
 198                         }
 199
 200                         if (ipv6_only_sock(sk) ||
 201                             !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
 202                                 retv = -EADDRNOTAVAIL;
 203                                 break;
 204                         }
 205
 206                         fl6_free_socklist(sk);
 207                         __ipv6_sock_mc_close(sk);
 208                         __ipv6_sock_ac_close(sk);
 209
 210                         /*
 211                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 212                          * remove it from the refcnt debug socks count in the
 213                          * original family...
 214                          */
 215                         sk_refcnt_debug_dec(sk);
 216
 217                         if (sk->sk_protocol == IPPROTO_TCP) {
 218                                 struct inet_connection_sock *icsk = inet_csk(sk);
 219                                 local_bh_disable();
 220                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 221                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 222                                 local_bh_enable();
 223                                 sk->sk_prot = &tcp_prot;
 224                                 icsk->icsk_af_ops = &ipv4_specific;
 225                                 sk->sk_socket->ops = &inet_stream_ops;
 226                                 sk->sk_family = PF_INET;
 227                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 228                         } else {
 229                                 struct proto *prot = &udp_prot;
 230
 231                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 232                                         prot = &udplite_prot;
 233                                 local_bh_disable();
 234                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 235                                 sock_prot_inuse_add(net, prot, 1);
 236                                 local_bh_enable();
 237                                 sk->sk_prot = prot;
 238                                 sk->sk_socket->ops = &inet_dgram_ops;
 239                                 sk->sk_family = PF_INET;
 240                         }
 241                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
 242                                    NULL);
 243                         if (opt) {
 244                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 245                                 txopt_put(opt);
 246                         }
 247                         pktopt = xchg(&np->pktoptions, NULL);
 248                         kfree_skb(pktopt);
 249
 250                         /*
 251                          * ... and add it to the refcnt debug socks count
 252                          * in the new family. -acme
 253                          */
 254                         sk_refcnt_debug_inc(sk);
 255                         module_put(THIS_MODULE);
 256                         retv = 0;
 257                         break;
 258                 }
 259                 goto e_inval;
 260
 261         case IPV6_V6ONLY:
 262                 if (optlen < sizeof(int) ||
 263                     inet_sk(sk)->inet_num)
 264                         goto e_inval;
 265                 sk->sk_ipv6only = valbool;
 266                 retv = 0;
 267                 break;
 268
 269         case IPV6_RECVPKTINFO:
 270                 if (optlen < sizeof(int))
 271                         goto e_inval;
 272                 np->rxopt.bits.rxinfo = valbool;
 273                 retv = 0;
 274                 break;
 275
 276         case IPV6_2292PKTINFO:
 277                 if (optlen < sizeof(int))
 278                         goto e_inval;
 279                 np->rxopt.bits.rxoinfo = valbool;
 280                 retv = 0;
 281                 break;
 282
 283         case IPV6_RECVHOPLIMIT:
 284                 if (optlen < sizeof(int))
 285                         goto e_inval;
 286                 np->rxopt.bits.rxhlim = valbool;
 287                 retv = 0;
 288                 break;
 289
 290         case IPV6_2292HOPLIMIT:
 291                 if (optlen < sizeof(int))
 292                         goto e_inval;
 293                 np->rxopt.bits.rxohlim = valbool;
 294                 retv = 0;
 295                 break;
 296
 297         case IPV6_RECVRTHDR:
 298                 if (optlen < sizeof(int))
 299                         goto e_inval;
 300                 np->rxopt.bits.srcrt = valbool;
 301                 retv = 0;
 302                 break;
 303
 304         case IPV6_2292RTHDR:
 305                 if (optlen < sizeof(int))
 306                         goto e_inval;
 307                 np->rxopt.bits.osrcrt = valbool;
 308                 retv = 0;
 309                 break;
 310
 311         case IPV6_RECVHOPOPTS:
 312                 if (optlen < sizeof(int))
 313                         goto e_inval;
 314                 np->rxopt.bits.hopopts = valbool;
 315                 retv = 0;
 316                 break;
 317
 318         case IPV6_2292HOPOPTS:
 319                 if (optlen < sizeof(int))
 320                         goto e_inval;
 321                 np->rxopt.bits.ohopopts = valbool;
 322                 retv = 0;
 323                 break;
 324
 325         case IPV6_RECVDSTOPTS:
 326                 if (optlen < sizeof(int))
 327                         goto e_inval;
 328                 np->rxopt.bits.dstopts = valbool;
 329                 retv = 0;
 330                 break;
 331
 332         case IPV6_2292DSTOPTS:
 333                 if (optlen < sizeof(int))
 334                         goto e_inval;
 335                 np->rxopt.bits.odstopts = valbool;
 336                 retv = 0;
 337                 break;
 338
 339         case IPV6_TCLASS:
 340                 if (optlen < sizeof(int))
 341                         goto e_inval;
 342                 if (val < -1 || val > 0xff)
 343                         goto e_inval;
 344                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 345                 if (val == -1)
 346                         val = 0;
 347                 np->tclass = val;
 348                 retv = 0;
 349                 break;
 350
 351         case IPV6_RECVTCLASS:
 352                 if (optlen < sizeof(int))
 353                         goto e_inval;
 354                 np->rxopt.bits.rxtclass = valbool;
 355                 retv = 0;
 356                 break;
 357
 358         case IPV6_FLOWINFO:
 359                 if (optlen < sizeof(int))
 360                         goto e_inval;
 361                 np->rxopt.bits.rxflow = valbool;
 362                 retv = 0;
 363                 break;
 364
 365         case IPV6_RECVPATHMTU:
 366                 if (optlen < sizeof(int))
 367                         goto e_inval;
 368                 np->rxopt.bits.rxpmtu = valbool;
 369                 retv = 0;
 370                 break;
 371
 372         case IPV6_TRANSPARENT:
 373                 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
 374                     !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
 375                         retv = -EPERM;
 376                         break;
 377                 }
 378                 if (optlen < sizeof(int))
 379                         goto e_inval;
 380                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 381                 inet_sk(sk)->transparent = valbool;
 382                 retv = 0;
 383                 break;
 384
 385         case IPV6_FREEBIND:
 386                 if (optlen < sizeof(int))
 387                         goto e_inval;
 388                 /* we also don't have a separate freebind bit for IPV6 */
 389                 inet_sk(sk)->freebind = valbool;
 390                 retv = 0;
 391                 break;
 392
 393         case IPV6_RECVORIGDSTADDR:
 394                 if (optlen < sizeof(int))
 395                         goto e_inval;
 396                 np->rxopt.bits.rxorigdstaddr = valbool;
 397                 retv = 0;
 398                 break;
 399
 400         case IPV6_HOPOPTS:
 401         case IPV6_RTHDRDSTOPTS:
 402         case IPV6_RTHDR:
 403         case IPV6_DSTOPTS:
 404         {
 405                 struct ipv6_txoptions *opt;
 406                 struct ipv6_opt_hdr *new = NULL;
 407
 408                 /* hop-by-hop / destination options are privileged option */
 409                 retv = -EPERM;
 410                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 411                         break;
 412
 413                 /* remove any sticky options header with a zero option
 414                  * length, per RFC3542.
 415                  */
 416                 if (optlen == 0)
 417                         optval = NULL;
 418                 else if (!optval)
 419                         goto e_inval;
 420                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 421                          optlen & 0x7 || optlen > 8 * 255)
 422                         goto e_inval;
 423                 else {
 424                         new = memdup_user(optval, optlen);
 425                         if (IS_ERR(new)) {
 426                                 retv = PTR_ERR(new);
 427                                 break;
 428                         }
 429                         if (unlikely(ipv6_optlen(new) > optlen)) {
 430                                 kfree(new);
 431                                 goto e_inval;
 432                         }
 433                 }
 434
 435                 opt = rcu_dereference_protected(np->opt,
 436                                                 lockdep_sock_is_held(sk));
 437                 opt = ipv6_renew_options(sk, opt, optname, new);
 438                 kfree(new);
 439                 if (IS_ERR(opt)) {
 440                         retv = PTR_ERR(opt);
 441                         break;
 442                 }
 443
 444                 /* routing header option needs extra check */
 445                 retv = -EINVAL;
 446                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 447                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 448                         switch (rthdr->type) {
 449 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 450                         case IPV6_SRCRT_TYPE_2:
 451                                 if (rthdr->hdrlen != 2 ||
 452                                     rthdr->segments_left != 1)
 453                                         goto sticky_done;
 454
 455                                 break;
 456 #endif
 457                         case IPV6_SRCRT_TYPE_4:
 458                         {
 459                                 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
 460                                                           opt->srcrt;
 461
 462                                 if (!seg6_validate_srh(srh, optlen))
 463                                         goto sticky_done;
 464                                 break;
 465                         }
 466                         default:
 467                                 goto sticky_done;
 468                         }
 469                 }
 470
 471                 retv = 0;
 472                 opt = ipv6_update_options(sk, opt);
 473 sticky_done:
 474                 if (opt) {
 475                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 476                         txopt_put(opt);
 477                 }
 478                 break;
 479         }
 480
 481         case IPV6_PKTINFO:
 482         {
 483                 struct in6_pktinfo pkt;
 484
 485                 if (optlen == 0)
 486                         goto e_inval;
 487                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 488                         goto e_inval;
 489
 490                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 491                                 retv = -EFAULT;
 492                                 break;
 493                 }
 494                 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
 495                         goto e_inval;
 496
 497                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 498                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 499                 retv = 0;
 500                 break;
 501         }
 502
 503         case IPV6_2292PKTOPTIONS:
 504         {
 505                 struct ipv6_txoptions *opt = NULL;
 506                 struct msghdr msg;
 507                 struct flowi6 fl6;
 508                 struct ipcm6_cookie ipc6;
 509
 510                 memset(&fl6, 0, sizeof(fl6));
 511                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 512                 fl6.flowi6_mark = sk->sk_mark;
 513
 514                 if (optlen == 0)
 515                         goto update;
 516
 517                 /* 1K is probably excessive
 518                  * 1K is surely not enough, 2K per standard header is 16K.
 519                  */
 520                 retv = -EINVAL;
 521                 if (optlen > 64*1024)
 522                         break;
 523
 524                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 525                 retv = -ENOBUFS;
 526                 if (!opt)
 527                         break;
 528
 529                 memset(opt, 0, sizeof(*opt));
 530                 refcount_set(&opt->refcnt, 1);
 531                 opt->tot_len = sizeof(*opt) + optlen;
 532                 retv = -EFAULT;
 533                 if (copy_from_user(opt+1, optval, optlen))
 534                         goto done;
 535
 536                 msg.msg_controllen = optlen;
 537                 msg.msg_control = (void *)(opt+1);
 538                 ipc6.opt = opt;
 539
 540                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
 541                 if (retv)
 542                         goto done;
 543 update:
 544                 retv = 0;
 545                 opt = ipv6_update_options(sk, opt);
 546 done:
 547                 if (opt) {
 548                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 549                         txopt_put(opt);
 550                 }
 551                 break;
 552         }
 553         case IPV6_UNICAST_HOPS:
 554                 if (optlen < sizeof(int))
 555                         goto e_inval;
 556                 if (val > 255 || val < -1)
 557                         goto e_inval;
 558                 np->hop_limit = val;
 559                 retv = 0;
 560                 break;
 561
 562         case IPV6_MULTICAST_HOPS:
 563                 if (sk->sk_type == SOCK_STREAM)
 564                         break;
 565                 if (optlen < sizeof(int))
 566                         goto e_inval;
 567                 if (val > 255 || val < -1)
 568                         goto e_inval;
 569                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 570                 retv = 0;
 571                 break;
 572
 573         case IPV6_MULTICAST_LOOP:
 574                 if (optlen < sizeof(int))
 575                         goto e_inval;
 576                 if (val != valbool)
 577                         goto e_inval;
 578                 np->mc_loop = valbool;
 579                 retv = 0;
 580                 break;
 581
 582         case IPV6_UNICAST_IF:
 583         {
 584                 struct net_device *dev = NULL;
 585                 int ifindex;
 586
 587                 if (optlen != sizeof(int))
 588                         goto e_inval;
 589
 590                 ifindex = (__force int)ntohl((__force __be32)val);
 591                 if (ifindex == 0) {
 592                         np->ucast_oif = 0;
 593                         retv = 0;
 594                         break;
 595                 }
 596
 597                 dev = dev_get_by_index(net, ifindex);
 598                 retv = -EADDRNOTAVAIL;
 599                 if (!dev)
 600                         break;
 601                 dev_put(dev);
 602
 603                 retv = -EINVAL;
 604                 if (sk->sk_bound_dev_if)
 605                         break;
 606
 607                 np->ucast_oif = ifindex;
 608                 retv = 0;
 609                 break;
 610         }
 611
 612         case IPV6_MULTICAST_IF:
 613                 if (sk->sk_type == SOCK_STREAM)
 614                         break;
 615                 if (optlen < sizeof(int))
 616                         goto e_inval;
 617
 618                 if (val) {
 619                         struct net_device *dev;
 620                         int midx;
 621
 622                         rcu_read_lock();
 623
 624                         dev = dev_get_by_index_rcu(net, val);
 625                         if (!dev) {
 626                                 rcu_read_unlock();
 627                                 retv = -ENODEV;
 628                                 break;
 629                         }
 630                         midx = l3mdev_master_ifindex_rcu(dev);
 631
 632                         rcu_read_unlock();
 633
 634                         if (sk->sk_bound_dev_if &&
 635                             sk->sk_bound_dev_if != val &&
 636                             (!midx || midx != sk->sk_bound_dev_if))
 637                                 goto e_inval;
 638                 }
 639                 np->mcast_oif = val;
 640                 retv = 0;
 641                 break;
 642         case IPV6_ADD_MEMBERSHIP:
 643         case IPV6_DROP_MEMBERSHIP:
 644         {
 645                 struct ipv6_mreq mreq;
 646
 647                 if (optlen < sizeof(struct ipv6_mreq))
 648                         goto e_inval;
 649
 650                 retv = -EPROTO;
 651                 if (inet_sk(sk)->is_icsk)
 652                         break;
 653
 654                 retv = -EFAULT;
 655                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 656                         break;
 657
 658                 if (optname == IPV6_ADD_MEMBERSHIP)
 659                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 660                 else
 661                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 662                 break;
 663         }
 664         case IPV6_JOIN_ANYCAST:
 665         case IPV6_LEAVE_ANYCAST:
 666         {
 667                 struct ipv6_mreq mreq;
 668
 669                 if (optlen < sizeof(struct ipv6_mreq))
 670                         goto e_inval;
 671
 672                 retv = -EFAULT;
 673                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 674                         break;
 675
 676                 if (optname == IPV6_JOIN_ANYCAST)
 677                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 678                 else
 679                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 680                 break;
 681         }
 682         case IPV6_MULTICAST_ALL:
 683                 if (optlen < sizeof(int))
 684                         goto e_inval;
 685                 np->mc_all = valbool;
 686                 retv = 0;
 687                 break;
 688
 689         case MCAST_JOIN_GROUP:
 690         case MCAST_LEAVE_GROUP:
 691         {
 692                 struct group_req greq;
 693                 struct sockaddr_in6 *psin6;
 694
 695                 if (optlen < sizeof(struct group_req))
 696                         goto e_inval;
 697
 698                 retv = -EFAULT;
 699                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 700                         break;
 701                 if (greq.gr_group.ss_family != AF_INET6) {
 702                         retv = -EADDRNOTAVAIL;
 703                         break;
 704                 }
 705                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 706                 if (optname == MCAST_JOIN_GROUP)
 707                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 708                                                  &psin6->sin6_addr);
 709                 else
 710                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 711                                                  &psin6->sin6_addr);
 712                 break;
 713         }
 714         case MCAST_JOIN_SOURCE_GROUP:
 715         case MCAST_LEAVE_SOURCE_GROUP:
 716         case MCAST_BLOCK_SOURCE:
 717         case MCAST_UNBLOCK_SOURCE:
 718         {
 719                 struct group_source_req greqs;
 720                 int omode, add;
 721
 722                 if (optlen < sizeof(struct group_source_req))
 723                         goto e_inval;
 724                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 725                         retv = -EFAULT;
 726                         break;
 727                 }
 728                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 729                     greqs.gsr_source.ss_family != AF_INET6) {
 730                         retv = -EADDRNOTAVAIL;
 731                         break;
 732                 }
 733                 if (optname == MCAST_BLOCK_SOURCE) {
 734                         omode = MCAST_EXCLUDE;
 735                         add = 1;
 736                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 737                         omode = MCAST_EXCLUDE;
 738                         add = 0;
 739                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 740                         struct sockaddr_in6 *psin6;
 741
 742                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 743                         retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
 744                                                      &psin6->sin6_addr,
 745                                                      MCAST_INCLUDE);
 746                         /* prior join w/ different source is ok */
 747                         if (retv && retv != -EADDRINUSE)
 748                                 break;
 749                         omode = MCAST_INCLUDE;
 750                         add = 1;
 751                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 752                         omode = MCAST_INCLUDE;
 753                         add = 0;
 754                 }
 755                 retv = ip6_mc_source(add, omode, sk, &greqs);
 756                 break;
 757         }
 758         case MCAST_MSFILTER:
 759         {
 760                 struct group_filter *gsf;
 761
 762                 if (optlen < GROUP_FILTER_SIZE(0))
 763                         goto e_inval;
 764                 if (optlen > sysctl_optmem_max) {
 765                         retv = -ENOBUFS;
 766                         break;
 767                 }
 768                 gsf = memdup_user(optval, optlen);
 769                 if (IS_ERR(gsf)) {
 770                         retv = PTR_ERR(gsf);
 771                         break;
 772                 }
 773                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 774                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 775                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 776                         kfree(gsf);
 777                         retv = -ENOBUFS;
 778                         break;
 779                 }
 780                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 781                         kfree(gsf);
 782                         retv = -EINVAL;
 783                         break;
 784                 }
 785                 retv = ip6_mc_msfilter(sk, gsf);
 786                 kfree(gsf);
 787
 788                 break;
 789         }
 790         case IPV6_ROUTER_ALERT:
 791                 if (optlen < sizeof(int))
 792                         goto e_inval;
 793                 retv = ip6_ra_control(sk, val);
 794                 break;
 795         case IPV6_ROUTER_ALERT_ISOLATE:
 796                 if (optlen < sizeof(int))
 797                         goto e_inval;
 798                 np->rtalert_isolate = valbool;
 799                 retv = 0;
 800                 break;
 801         case IPV6_MTU_DISCOVER:
 802                 if (optlen < sizeof(int))
 803                         goto e_inval;
 804                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 805                         goto e_inval;
 806                 np->pmtudisc = val;
 807                 retv = 0;
 808                 break;
 809         case IPV6_MTU:
 810                 if (optlen < sizeof(int))
 811                         goto e_inval;
 812                 if (val && val < IPV6_MIN_MTU)
 813                         goto e_inval;
 814                 np->frag_size = val;
 815                 retv = 0;
 816                 break;
 817         case IPV6_RECVERR:
 818                 if (optlen < sizeof(int))
 819                         goto e_inval;
 820                 np->recverr = valbool;
 821                 if (!val)
 822                         skb_queue_purge(&sk->sk_error_queue);
 823                 retv = 0;
 824                 break;
 825         case IPV6_FLOWINFO_SEND:
 826                 if (optlen < sizeof(int))
 827                         goto e_inval;
 828                 np->sndflow = valbool;
 829                 retv = 0;
 830                 break;
 831         case IPV6_FLOWLABEL_MGR:
 832                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 833                 break;
 834         case IPV6_IPSEC_POLICY:
 835         case IPV6_XFRM_POLICY:
 836                 retv = -EPERM;
 837                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 838                         break;
 839                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 840                 break;
 841
 842         case IPV6_ADDR_PREFERENCES:
 843             {
 844                 unsigned int pref = 0;
 845                 unsigned int prefmask = ~0;
 846
 847                 if (optlen < sizeof(int))
 848                         goto e_inval;
 849
 850                 retv = -EINVAL;
 851
 852                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 853                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 854                                IPV6_PREFER_SRC_TMP|
 855                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 856                 case IPV6_PREFER_SRC_PUBLIC:
 857                         pref |= IPV6_PREFER_SRC_PUBLIC;
 858                         break;
 859                 case IPV6_PREFER_SRC_TMP:
 860                         pref |= IPV6_PREFER_SRC_TMP;
 861                         break;
 862                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 863                         break;
 864                 case 0:
 865                         goto pref_skip_pubtmp;
 866                 default:
 867                         goto e_inval;
 868                 }
 869
 870                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 871                               IPV6_PREFER_SRC_TMP);
 872 pref_skip_pubtmp:
 873
 874                 /* check HOME/COA conflicts */
 875                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 876                 case IPV6_PREFER_SRC_HOME:
 877                         break;
 878                 case IPV6_PREFER_SRC_COA:
 879                         pref |= IPV6_PREFER_SRC_COA;
 880                 case 0:
 881                         goto pref_skip_coa;
 882                 default:
 883                         goto e_inval;
 884                 }
 885
 886                 prefmask &= ~IPV6_PREFER_SRC_COA;
 887 pref_skip_coa:
 888
 889                 /* check CGA/NONCGA conflicts */
 890                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 891                 case IPV6_PREFER_SRC_CGA:
 892                 case IPV6_PREFER_SRC_NONCGA:
 893                 case 0:
 894                         break;
 895                 default:
 896                         goto e_inval;
 897                 }
 898
 899                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 900                 retv = 0;
 901
 902                 break;
 903             }
 904         case IPV6_MINHOPCOUNT:
 905                 if (optlen < sizeof(int))
 906                         goto e_inval;
 907                 if (val < 0 || val > 255)
 908                         goto e_inval;
 909                 np->min_hopcount = val;
 910                 retv = 0;
 911                 break;
 912         case IPV6_DONTFRAG:
 913                 np->dontfrag = valbool;
 914                 retv = 0;
 915                 break;
 916         case IPV6_AUTOFLOWLABEL:
 917                 np->autoflowlabel = valbool;
 918                 np->autoflowlabel_set = 1;
 919                 retv = 0;
 920                 break;
 921         case IPV6_RECVFRAGSIZE:
 922                 np->rxopt.bits.recvfragsize = valbool;
 923                 retv = 0;
 924                 break;
 925         }
 926
 927         release_sock(sk);
 928         if (needs_rtnl)
 929                 rtnl_unlock();
 930
 931         return retv;
 932
 933 e_inval:
 934         release_sock(sk);
 935         if (needs_rtnl)
 936                 rtnl_unlock();
 937         return -EINVAL;
 938 }
 939
 940 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 941                     char __user *optval, unsigned int optlen)
 942 {
 943         int err;
 944
 945         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 946                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 947
 948         if (level != SOL_IPV6)
 949                 return -ENOPROTOOPT;
 950
 951         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 952 #ifdef CONFIG_NETFILTER
 953         /* we need to exclude all possible ENOPROTOOPTs except default case */
 954         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 955                         optname != IPV6_XFRM_POLICY)
 956                 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
 957 #endif
 958         return err;
 959 }
 960 EXPORT_SYMBOL(ipv6_setsockopt);
 961
 962 #ifdef CONFIG_COMPAT
 963 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 964                            char __user *optval, unsigned int optlen)
 965 {
 966         int err;
 967
 968         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 969                 if (udp_prot.compat_setsockopt != NULL)
 970                         return udp_prot.compat_setsockopt(sk, level, optname,
 971                                                           optval, optlen);
 972                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 973         }
 974
 975         if (level != SOL_IPV6)
 976                 return -ENOPROTOOPT;
 977
 978         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 979                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 980                         ipv6_setsockopt);
 981
 982         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 983 #ifdef CONFIG_NETFILTER
 984         /* we need to exclude all possible ENOPROTOOPTs except default case */
 985         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 986             optname != IPV6_XFRM_POLICY)
 987                 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
 988                                            optlen);
 989 #endif
 990         return err;
 991 }
 992 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 993 #endif
 994
 995 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 996                                   int optname, char __user *optval, int len)
 997 {
 998         struct ipv6_opt_hdr *hdr;
 999
1000         if (!opt)
1001                 return 0;
1002
1003         switch (optname) {
1004         case IPV6_HOPOPTS:
1005                 hdr = opt->hopopt;
1006                 break;
1007         case IPV6_RTHDRDSTOPTS:
1008                 hdr = opt->dst0opt;
1009                 break;
1010         case IPV6_RTHDR:
1011                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1012                 break;
1013         case IPV6_DSTOPTS:
1014                 hdr = opt->dst1opt;
1015                 break;
1016         default:
1017                 return -EINVAL; /* should not happen */
1018         }
1019
1020         if (!hdr)
1021                 return 0;
1022
1023         len = min_t(unsigned int, len, ipv6_optlen(hdr));
1024         if (copy_to_user(optval, hdr, len))
1025                 return -EFAULT;
1026         return len;
1027 }
1028
1029 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1030                     char __user *optval, int __user *optlen, unsigned int flags)
1031 {
1032         struct ipv6_pinfo *np = inet6_sk(sk);
1033         int len;
1034         int val;
1035
1036         if (ip6_mroute_opt(optname))
1037                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1038
1039         if (get_user(len, optlen))
1040                 return -EFAULT;
1041         switch (optname) {
1042         case IPV6_ADDRFORM:
1043                 if (sk->sk_protocol != IPPROTO_UDP &&
1044                     sk->sk_protocol != IPPROTO_UDPLITE &&
1045                     sk->sk_protocol != IPPROTO_TCP)
1046                         return -ENOPROTOOPT;
1047                 if (sk->sk_state != TCP_ESTABLISHED)
1048                         return -ENOTCONN;
1049                 val = sk->sk_family;
1050                 break;
1051         case MCAST_MSFILTER:
1052         {
1053                 struct group_filter gsf;
1054                 int err;
1055
1056                 if (len < GROUP_FILTER_SIZE(0))
1057                         return -EINVAL;
1058                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1059                         return -EFAULT;
1060                 if (gsf.gf_group.ss_family != AF_INET6)
1061                         return -EADDRNOTAVAIL;
1062                 lock_sock(sk);
1063                 err = ip6_mc_msfget(sk, &gsf,
1064                         (struct group_filter __user *)optval, optlen);
1065                 release_sock(sk);
1066                 return err;
1067         }
1068
1069         case IPV6_2292PKTOPTIONS:
1070         {
1071                 struct msghdr msg;
1072                 struct sk_buff *skb;
1073
1074                 if (sk->sk_type != SOCK_STREAM)
1075                         return -ENOPROTOOPT;
1076
1077                 msg.msg_control = optval;
1078                 msg.msg_controllen = len;
1079                 msg.msg_flags = flags;
1080
1081                 lock_sock(sk);
1082                 skb = np->pktoptions;
1083                 if (skb)
1084                         ip6_datagram_recv_ctl(sk, &msg, skb);
1085                 release_sock(sk);
1086                 if (!skb) {
1087                         if (np->rxopt.bits.rxinfo) {
1088                                 struct in6_pktinfo src_info;
1089                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1090                                         np->sticky_pktinfo.ipi6_ifindex;
1091                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1092                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1093                         }
1094                         if (np->rxopt.bits.rxhlim) {
1095                                 int hlim = np->mcast_hops;
1096                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1097                         }
1098                         if (np->rxopt.bits.rxtclass) {
1099                                 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1100
1101                                 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1102                         }
1103                         if (np->rxopt.bits.rxoinfo) {
1104                                 struct in6_pktinfo src_info;
1105                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1106                                         np->sticky_pktinfo.ipi6_ifindex;
1107                                 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1108                                                                      np->sticky_pktinfo.ipi6_addr;
1109                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1110                         }
1111                         if (np->rxopt.bits.rxohlim) {
1112                                 int hlim = np->mcast_hops;
1113                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1114                         }
1115                         if (np->rxopt.bits.rxflow) {
1116                                 __be32 flowinfo = np->rcv_flowinfo;
1117
1118                                 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1119                         }
1120                 }
1121                 len -= msg.msg_controllen;
1122                 return put_user(len, optlen);
1123         }
1124         case IPV6_MTU:
1125         {
1126                 struct dst_entry *dst;
1127
1128                 val = 0;
1129                 rcu_read_lock();
1130                 dst = __sk_dst_get(sk);
1131                 if (dst)
1132                         val = dst_mtu(dst);
1133                 rcu_read_unlock();
1134                 if (!val)
1135                         return -ENOTCONN;
1136                 break;
1137         }
1138
1139         case IPV6_V6ONLY:
1140                 val = sk->sk_ipv6only;
1141                 break;
1142
1143         case IPV6_RECVPKTINFO:
1144                 val = np->rxopt.bits.rxinfo;
1145                 break;
1146
1147         case IPV6_2292PKTINFO:
1148                 val = np->rxopt.bits.rxoinfo;
1149                 break;
1150
1151         case IPV6_RECVHOPLIMIT:
1152                 val = np->rxopt.bits.rxhlim;
1153                 break;
1154
1155         case IPV6_2292HOPLIMIT:
1156                 val = np->rxopt.bits.rxohlim;
1157                 break;
1158
1159         case IPV6_RECVRTHDR:
1160                 val = np->rxopt.bits.srcrt;
1161                 break;
1162
1163         case IPV6_2292RTHDR:
1164                 val = np->rxopt.bits.osrcrt;
1165                 break;
1166
1167         case IPV6_HOPOPTS:
1168         case IPV6_RTHDRDSTOPTS:
1169         case IPV6_RTHDR:
1170         case IPV6_DSTOPTS:
1171         {
1172                 struct ipv6_txoptions *opt;
1173
1174                 lock_sock(sk);
1175                 opt = rcu_dereference_protected(np->opt,
1176                                                 lockdep_sock_is_held(sk));
1177                 len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
1178                 release_sock(sk);
1179                 /* check if ipv6_getsockopt_sticky() returns err code */
1180                 if (len < 0)
1181                         return len;
1182                 return put_user(len, optlen);
1183         }
1184
1185         case IPV6_RECVHOPOPTS:
1186                 val = np->rxopt.bits.hopopts;
1187                 break;
1188
1189         case IPV6_2292HOPOPTS:
1190                 val = np->rxopt.bits.ohopopts;
1191                 break;
1192
1193         case IPV6_RECVDSTOPTS:
1194                 val = np->rxopt.bits.dstopts;
1195                 break;
1196
1197         case IPV6_2292DSTOPTS:
1198                 val = np->rxopt.bits.odstopts;
1199                 break;
1200
1201         case IPV6_TCLASS:
1202                 val = np->tclass;
1203                 break;
1204
1205         case IPV6_RECVTCLASS:
1206                 val = np->rxopt.bits.rxtclass;
1207                 break;
1208
1209         case IPV6_FLOWINFO:
1210                 val = np->rxopt.bits.rxflow;
1211                 break;
1212
1213         case IPV6_RECVPATHMTU:
1214                 val = np->rxopt.bits.rxpmtu;
1215                 break;
1216
1217         case IPV6_PATHMTU:
1218         {
1219                 struct dst_entry *dst;
1220                 struct ip6_mtuinfo mtuinfo;
1221
1222                 if (len < sizeof(mtuinfo))
1223                         return -EINVAL;
1224
1225                 len = sizeof(mtuinfo);
1226                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1227
1228                 rcu_read_lock();
1229                 dst = __sk_dst_get(sk);
1230                 if (dst)
1231                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1232                 rcu_read_unlock();
1233                 if (!mtuinfo.ip6m_mtu)
1234                         return -ENOTCONN;
1235
1236                 if (put_user(len, optlen))
1237                         return -EFAULT;
1238                 if (copy_to_user(optval, &mtuinfo, len))
1239                         return -EFAULT;
1240
1241                 return 0;
1242         }
1243
1244         case IPV6_TRANSPARENT:
1245                 val = inet_sk(sk)->transparent;
1246                 break;
1247
1248         case IPV6_FREEBIND:
1249                 val = inet_sk(sk)->freebind;
1250                 break;
1251
1252         case IPV6_RECVORIGDSTADDR:
1253                 val = np->rxopt.bits.rxorigdstaddr;
1254                 break;
1255
1256         case IPV6_UNICAST_HOPS:
1257         case IPV6_MULTICAST_HOPS:
1258         {
1259                 struct dst_entry *dst;
1260
1261                 if (optname == IPV6_UNICAST_HOPS)
1262                         val = np->hop_limit;
1263                 else
1264                         val = np->mcast_hops;
1265
1266                 if (val < 0) {
1267                         rcu_read_lock();
1268                         dst = __sk_dst_get(sk);
1269                         if (dst)
1270                                 val = ip6_dst_hoplimit(dst);
1271                         rcu_read_unlock();
1272                 }
1273
1274                 if (val < 0)
1275                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1276                 break;
1277         }
1278
1279         case IPV6_MULTICAST_LOOP:
1280                 val = np->mc_loop;
1281                 break;
1282
1283         case IPV6_MULTICAST_IF:
1284                 val = np->mcast_oif;
1285                 break;
1286
1287         case IPV6_MULTICAST_ALL:
1288                 val = np->mc_all;
1289                 break;
1290
1291         case IPV6_UNICAST_IF:
1292                 val = (__force int)htonl((__u32) np->ucast_oif);
1293                 break;
1294
1295         case IPV6_MTU_DISCOVER:
1296                 val = np->pmtudisc;
1297                 break;
1298
1299         case IPV6_RECVERR:
1300                 val = np->recverr;
1301                 break;
1302
1303         case IPV6_FLOWINFO_SEND:
1304                 val = np->sndflow;
1305                 break;
1306
1307         case IPV6_FLOWLABEL_MGR:
1308         {
1309                 struct in6_flowlabel_req freq;
1310                 int flags;
1311
1312                 if (len < sizeof(freq))
1313                         return -EINVAL;
1314
1315                 if (copy_from_user(&freq, optval, sizeof(freq)))
1316                         return -EFAULT;
1317
1318                 if (freq.flr_action != IPV6_FL_A_GET)
1319                         return -EINVAL;
1320
1321                 len = sizeof(freq);
1322                 flags = freq.flr_flags;
1323
1324                 memset(&freq, 0, sizeof(freq));
1325
1326                 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1327                 if (val < 0)
1328                         return val;
1329
1330                 if (put_user(len, optlen))
1331                         return -EFAULT;
1332                 if (copy_to_user(optval, &freq, len))
1333                         return -EFAULT;
1334
1335                 return 0;
1336         }
1337
1338         case IPV6_ADDR_PREFERENCES:
1339                 val = 0;
1340
1341                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1342                         val |= IPV6_PREFER_SRC_TMP;
1343                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1344                         val |= IPV6_PREFER_SRC_PUBLIC;
1345                 else {
1346                         /* XXX: should we return system default? */
1347                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1348                 }
1349
1350                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1351                         val |= IPV6_PREFER_SRC_COA;
1352                 else
1353                         val |= IPV6_PREFER_SRC_HOME;
1354                 break;
1355
1356         case IPV6_MINHOPCOUNT:
1357                 val = np->min_hopcount;
1358                 break;
1359
1360         case IPV6_DONTFRAG:
1361                 val = np->dontfrag;
1362                 break;
1363
1364         case IPV6_AUTOFLOWLABEL:
1365                 val = ip6_autoflowlabel(sock_net(sk), np);
1366                 break;
1367
1368         case IPV6_RECVFRAGSIZE:
1369                 val = np->rxopt.bits.recvfragsize;
1370                 break;
1371
1372         case IPV6_ROUTER_ALERT_ISOLATE:
1373                 val = np->rtalert_isolate;
1374                 break;
1375
1376         default:
1377                 return -ENOPROTOOPT;
1378         }
1379         len = min_t(unsigned int, sizeof(int), len);
1380         if (put_user(len, optlen))
1381                 return -EFAULT;
1382         if (copy_to_user(optval, &val, len))
1383                 return -EFAULT;
1384         return 0;
1385 }
1386
1387 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1388                     char __user *optval, int __user *optlen)
1389 {
1390         int err;
1391
1392         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1393                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1394
1395         if (level != SOL_IPV6)
1396                 return -ENOPROTOOPT;
1397
1398         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1399 #ifdef CONFIG_NETFILTER
1400         /* we need to exclude all possible ENOPROTOOPTs except default case */
1401         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1402                 int len;
1403
1404                 if (get_user(len, optlen))
1405                         return -EFAULT;
1406
1407                 err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1408                 if (err >= 0)
1409                         err = put_user(len, optlen);
1410         }
1411 #endif
1412         return err;
1413 }
1414 EXPORT_SYMBOL(ipv6_getsockopt);
1415
1416 #ifdef CONFIG_COMPAT
1417 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1418                            char __user *optval, int __user *optlen)
1419 {
1420         int err;
1421
1422         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1423                 if (udp_prot.compat_getsockopt != NULL)
1424                         return udp_prot.compat_getsockopt(sk, level, optname,
1425                                                           optval, optlen);
1426                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1427         }
1428
1429         if (level != SOL_IPV6)
1430                 return -ENOPROTOOPT;
1431
1432         if (optname == MCAST_MSFILTER)
1433                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1434                         ipv6_getsockopt);
1435
1436         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1437                                  MSG_CMSG_COMPAT);
1438 #ifdef CONFIG_NETFILTER
1439         /* we need to exclude all possible ENOPROTOOPTs except default case */
1440         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1441                 int len;
1442
1443                 if (get_user(len, optlen))
1444                         return -EFAULT;
1445
1446                 err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
1447                 if (err >= 0)
1448                         err = put_user(len, optlen);
1449         }
1450 #endif
1451         return err;
1452 }
1453 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1454 #endif