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