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                                 break;
 192                         } else {
 193                                 break;
 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
 209                         /*
 210                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 211                          * remove it from the refcnt debug socks count in the
 212                          * original family...
 213                          */
 214                         sk_refcnt_debug_dec(sk);
 215
 216                         if (sk->sk_protocol == IPPROTO_TCP) {
 217                                 struct inet_connection_sock *icsk = inet_csk(sk);
 218                                 local_bh_disable();
 219                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 220                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 221                                 local_bh_enable();
 222                                 sk->sk_prot = &tcp_prot;
 223                                 icsk->icsk_af_ops = &ipv4_specific;
 224                                 sk->sk_socket->ops = &inet_stream_ops;
 225                                 sk->sk_family = PF_INET;
 226                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 227                         } else {
 228                                 struct proto *prot = &udp_prot;
 229
 230                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 231                                         prot = &udplite_prot;
 232                                 local_bh_disable();
 233                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 234                                 sock_prot_inuse_add(net, prot, 1);
 235                                 local_bh_enable();
 236                                 sk->sk_prot = prot;
 237                                 sk->sk_socket->ops = &inet_dgram_ops;
 238                                 sk->sk_family = PF_INET;
 239                         }
 240                         opt = xchg((__force struct ipv6_txoptions **)&np->opt,
 241                                    NULL);
 242                         if (opt) {
 243                                 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 244                                 txopt_put(opt);
 245                         }
 246                         pktopt = xchg(&np->pktoptions, NULL);
 247                         kfree_skb(pktopt);
 248
 249                         /*
 250                          * ... and add it to the refcnt debug socks count
 251                          * in the new family. -acme
 252                          */
 253                         sk_refcnt_debug_inc(sk);
 254                         module_put(THIS_MODULE);
 255                         retv = 0;
 256                         break;
 257                 }
 258                 goto e_inval;
 259
 260         case IPV6_V6ONLY:
 261                 if (optlen < sizeof(int) ||
 262                     inet_sk(sk)->inet_num)
 263                         goto e_inval;
 264                 sk->sk_ipv6only = valbool;
 265                 retv = 0;
 266                 break;
 267
 268         case IPV6_RECVPKTINFO:
 269                 if (optlen < sizeof(int))
 270                         goto e_inval;
 271                 np->rxopt.bits.rxinfo = valbool;
 272                 retv = 0;
 273                 break;
 274
 275         case IPV6_2292PKTINFO:
 276                 if (optlen < sizeof(int))
 277                         goto e_inval;
 278                 np->rxopt.bits.rxoinfo = valbool;
 279                 retv = 0;
 280                 break;
 281
 282         case IPV6_RECVHOPLIMIT:
 283                 if (optlen < sizeof(int))
 284                         goto e_inval;
 285                 np->rxopt.bits.rxhlim = valbool;
 286                 retv = 0;
 287                 break;
 288
 289         case IPV6_2292HOPLIMIT:
 290                 if (optlen < sizeof(int))
 291                         goto e_inval;
 292                 np->rxopt.bits.rxohlim = valbool;
 293                 retv = 0;
 294                 break;
 295
 296         case IPV6_RECVRTHDR:
 297                 if (optlen < sizeof(int))
 298                         goto e_inval;
 299                 np->rxopt.bits.srcrt = valbool;
 300                 retv = 0;
 301                 break;
 302
 303         case IPV6_2292RTHDR:
 304                 if (optlen < sizeof(int))
 305                         goto e_inval;
 306                 np->rxopt.bits.osrcrt = valbool;
 307                 retv = 0;
 308                 break;
 309
 310         case IPV6_RECVHOPOPTS:
 311                 if (optlen < sizeof(int))
 312                         goto e_inval;
 313                 np->rxopt.bits.hopopts = valbool;
 314                 retv = 0;
 315                 break;
 316
 317         case IPV6_2292HOPOPTS:
 318                 if (optlen < sizeof(int))
 319                         goto e_inval;
 320                 np->rxopt.bits.ohopopts = valbool;
 321                 retv = 0;
 322                 break;
 323
 324         case IPV6_RECVDSTOPTS:
 325                 if (optlen < sizeof(int))
 326                         goto e_inval;
 327                 np->rxopt.bits.dstopts = valbool;
 328                 retv = 0;
 329                 break;
 330
 331         case IPV6_2292DSTOPTS:
 332                 if (optlen < sizeof(int))
 333                         goto e_inval;
 334                 np->rxopt.bits.odstopts = valbool;
 335                 retv = 0;
 336                 break;
 337
 338         case IPV6_TCLASS:
 339                 if (optlen < sizeof(int))
 340                         goto e_inval;
 341                 if (val < -1 || val > 0xff)
 342                         goto e_inval;
 343                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 344                 if (val == -1)
 345                         val = 0;
 346                 np->tclass = val;
 347                 retv = 0;
 348                 break;
 349
 350         case IPV6_RECVTCLASS:
 351                 if (optlen < sizeof(int))
 352                         goto e_inval;
 353                 np->rxopt.bits.rxtclass = valbool;
 354                 retv = 0;
 355                 break;
 356
 357         case IPV6_FLOWINFO:
 358                 if (optlen < sizeof(int))
 359                         goto e_inval;
 360                 np->rxopt.bits.rxflow = valbool;
 361                 retv = 0;
 362                 break;
 363
 364         case IPV6_RECVPATHMTU:
 365                 if (optlen < sizeof(int))
 366                         goto e_inval;
 367                 np->rxopt.bits.rxpmtu = valbool;
 368                 retv = 0;
 369                 break;
 370
 371         case IPV6_TRANSPARENT:
 372                 if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
 373                     !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
 374                         retv = -EPERM;
 375                         break;
 376                 }
 377                 if (optlen < sizeof(int))
 378                         goto e_inval;
 379                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 380                 inet_sk(sk)->transparent = valbool;
 381                 retv = 0;
 382                 break;
 383
 384         case IPV6_FREEBIND:
 385                 if (optlen < sizeof(int))
 386                         goto e_inval;
 387                 /* we also don't have a separate freebind bit for IPV6 */
 388                 inet_sk(sk)->freebind = valbool;
 389                 retv = 0;
 390                 break;
 391
 392         case IPV6_RECVORIGDSTADDR:
 393                 if (optlen < sizeof(int))
 394                         goto e_inval;
 395                 np->rxopt.bits.rxorigdstaddr = valbool;
 396                 retv = 0;
 397                 break;
 398
 399         case IPV6_HOPOPTS:
 400         case IPV6_RTHDRDSTOPTS:
 401         case IPV6_RTHDR:
 402         case IPV6_DSTOPTS:
 403         {
 404                 struct ipv6_txoptions *opt;
 405                 struct ipv6_opt_hdr *new = NULL;
 406
 407                 /* hop-by-hop / destination options are privileged option */
 408                 retv = -EPERM;
 409                 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
 410                         break;
 411
 412                 /* remove any sticky options header with a zero option
 413                  * length, per RFC3542.
 414                  */
 415                 if (optlen == 0)
 416                         optval = NULL;
 417                 else if (!optval)
 418                         goto e_inval;
 419                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 420                          optlen & 0x7 || optlen > 8 * 255)
 421                         goto e_inval;
 422                 else {
 423                         new = memdup_user(optval, optlen);
 424                         if (IS_ERR(new)) {
 425                                 retv = PTR_ERR(new);
 426                                 break;
 427                         }
 428                         if (unlikely(ipv6_optlen(new) > optlen)) {
 429                                 kfree(new);
 430                                 goto e_inval;
 431                         }
 432                 }
 433
 434                 opt = rcu_dereference_protected(np->opt,
 435                                                 lockdep_sock_is_held(sk));
 436                 opt = ipv6_renew_options(sk, opt, optname, new);
 437                 kfree(new);
 438                 if (IS_ERR(opt)) {
 439                         retv = PTR_ERR(opt);
 440                         break;
 441                 }
 442
 443                 /* routing header option needs extra check */
 444                 retv = -EINVAL;
 445                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 446                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 447                         switch (rthdr->type) {
 448 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 449                         case IPV6_SRCRT_TYPE_2:
 450                                 if (rthdr->hdrlen != 2 ||
 451                                     rthdr->segments_left != 1)
 452                                         goto sticky_done;
 453
 454                                 break;
 455 #endif
 456                         case IPV6_SRCRT_TYPE_4:
 457                         {
 458                                 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)
 459                                                           opt->srcrt;
 460
 461                                 if (!seg6_validate_srh(srh, optlen))
 462                                         goto sticky_done;
 463                                 break;
 464                         }
 465                         default:
 466                                 goto sticky_done;
 467                         }
 468                 }
 469
 470                 retv = 0;
 471                 opt = ipv6_update_options(sk, opt);
 472 sticky_done:
 473                 if (opt) {
 474                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 475                         txopt_put(opt);
 476                 }
 477                 break;
 478         }
 479
 480         case IPV6_PKTINFO:
 481         {
 482                 struct in6_pktinfo pkt;
 483
 484                 if (optlen == 0)
 485                         goto e_inval;
 486                 else if (optlen < sizeof(struct in6_pktinfo) || !optval)
 487                         goto e_inval;
 488
 489                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 490                                 retv = -EFAULT;
 491                                 break;
 492                 }
 493                 if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
 494                         goto e_inval;
 495
 496                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 497                 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
 498                 retv = 0;
 499                 break;
 500         }
 501
 502         case IPV6_2292PKTOPTIONS:
 503         {
 504                 struct ipv6_txoptions *opt = NULL;
 505                 struct msghdr msg;
 506                 struct flowi6 fl6;
 507                 struct ipcm6_cookie ipc6;
 508
 509                 memset(&fl6, 0, sizeof(fl6));
 510                 fl6.flowi6_oif = sk->sk_bound_dev_if;
 511                 fl6.flowi6_mark = sk->sk_mark;
 512
 513                 if (optlen == 0)
 514                         goto update;
 515
 516                 /* 1K is probably excessive
 517                  * 1K is surely not enough, 2K per standard header is 16K.
 518                  */
 519                 retv = -EINVAL;
 520                 if (optlen > 64*1024)
 521                         break;
 522
 523                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 524                 retv = -ENOBUFS;
 525                 if (!opt)
 526                         break;
 527
 528                 memset(opt, 0, sizeof(*opt));
 529                 refcount_set(&opt->refcnt, 1);
 530                 opt->tot_len = sizeof(*opt) + optlen;
 531                 retv = -EFAULT;
 532                 if (copy_from_user(opt+1, optval, optlen))
 533                         goto done;
 534
 535                 msg.msg_controllen = optlen;
 536                 msg.msg_control = (void *)(opt+1);
 537                 ipc6.opt = opt;
 538
 539                 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
 540                 if (retv)
 541                         goto done;
 542 update:
 543                 retv = 0;
 544                 opt = ipv6_update_options(sk, opt);
 545 done:
 546                 if (opt) {
 547                         atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 548                         txopt_put(opt);
 549                 }
 550                 break;
 551         }
 552         case IPV6_UNICAST_HOPS:
 553                 if (optlen < sizeof(int))
 554                         goto e_inval;
 555                 if (val > 255 || val < -1)
 556                         goto e_inval;
 557                 np->hop_limit = val;
 558                 retv = 0;
 559                 break;
 560
 561         case IPV6_MULTICAST_HOPS:
 562                 if (sk->sk_type == SOCK_STREAM)
 563                         break;
 564                 if (optlen < sizeof(int))
 565                         goto e_inval;
 566                 if (val > 255 || val < -1)
 567                         goto e_inval;
 568                 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
 569                 retv = 0;
 570                 break;
 571
 572         case IPV6_MULTICAST_LOOP:
 573                 if (optlen < sizeof(int))
 574                         goto e_inval;
 575                 if (val != valbool)
 576                         goto e_inval;
 577                 np->mc_loop = valbool;
 578                 retv = 0;
 579                 break;
 580
 581         case IPV6_UNICAST_IF:
 582         {
 583                 struct net_device *dev = NULL;
 584                 int ifindex;
 585
 586                 if (optlen != sizeof(int))
 587                         goto e_inval;
 588
 589                 ifindex = (__force int)ntohl((__force __be32)val);
 590                 if (ifindex == 0) {
 591                         np->ucast_oif = 0;
 592                         retv = 0;
 593                         break;
 594                 }
 595
 596                 dev = dev_get_by_index(net, ifindex);
 597                 retv = -EADDRNOTAVAIL;
 598                 if (!dev)
 599                         break;
 600                 dev_put(dev);
 601
 602                 retv = -EINVAL;
 603                 if (sk->sk_bound_dev_if)
 604                         break;
 605
 606                 np->ucast_oif = ifindex;
 607                 retv = 0;
 608                 break;
 609         }
 610
 611         case IPV6_MULTICAST_IF:
 612                 if (sk->sk_type == SOCK_STREAM)
 613                         break;
 614                 if (optlen < sizeof(int))
 615                         goto e_inval;
 616
 617                 if (val) {
 618                         struct net_device *dev;
 619                         int midx;
 620
 621                         rcu_read_lock();
 622
 623                         dev = dev_get_by_index_rcu(net, val);
 624                         if (!dev) {
 625                                 rcu_read_unlock();
 626                                 retv = -ENODEV;
 627                                 break;
 628                         }
 629                         midx = l3mdev_master_ifindex_rcu(dev);
 630
 631                         rcu_read_unlock();
 632
 633                         if (sk->sk_bound_dev_if &&
 634                             sk->sk_bound_dev_if != val &&
 635                             (!midx || midx != sk->sk_bound_dev_if))
 636                                 goto e_inval;
 637                 }
 638                 np->mcast_oif = val;
 639                 retv = 0;
 640                 break;
 641         case IPV6_ADD_MEMBERSHIP:
 642         case IPV6_DROP_MEMBERSHIP:
 643         {
 644                 struct ipv6_mreq mreq;
 645
 646                 if (optlen < sizeof(struct ipv6_mreq))
 647                         goto e_inval;
 648
 649                 retv = -EPROTO;
 650                 if (inet_sk(sk)->is_icsk)
 651                         break;
 652
 653                 retv = -EFAULT;
 654                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 655                         break;
 656
 657                 if (optname == IPV6_ADD_MEMBERSHIP)
 658                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 659                 else
 660                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 661                 break;
 662         }
 663         case IPV6_JOIN_ANYCAST:
 664         case IPV6_LEAVE_ANYCAST:
 665         {
 666                 struct ipv6_mreq mreq;
 667
 668                 if (optlen < sizeof(struct ipv6_mreq))
 669                         goto e_inval;
 670
 671                 retv = -EFAULT;
 672                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 673                         break;
 674
 675                 if (optname == IPV6_JOIN_ANYCAST)
 676                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 677                 else
 678                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 679                 break;
 680         }
 681         case IPV6_MULTICAST_ALL:
 682                 if (optlen < sizeof(int))
 683                         goto e_inval;
 684                 np->mc_all = valbool;
 685                 retv = 0;
 686                 break;
 687
 688         case MCAST_JOIN_GROUP:
 689         case MCAST_LEAVE_GROUP:
 690         {
 691                 struct group_req greq;
 692                 struct sockaddr_in6 *psin6;
 693
 694                 if (optlen < sizeof(struct group_req))
 695                         goto e_inval;
 696
 697                 retv = -EFAULT;
 698                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 699                         break;
 700                 if (greq.gr_group.ss_family != AF_INET6) {
 701                         retv = -EADDRNOTAVAIL;
 702                         break;
 703                 }
 704                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 705                 if (optname == MCAST_JOIN_GROUP)
 706                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 707                                                  &psin6->sin6_addr);
 708                 else
 709                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 710                                                  &psin6->sin6_addr);
 711                 break;
 712         }
 713         case MCAST_JOIN_SOURCE_GROUP:
 714         case MCAST_LEAVE_SOURCE_GROUP:
 715         case MCAST_BLOCK_SOURCE:
 716         case MCAST_UNBLOCK_SOURCE:
 717         {
 718                 struct group_source_req greqs;
 719                 int omode, add;
 720
 721                 if (optlen < sizeof(struct group_source_req))
 722                         goto e_inval;
 723                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 724                         retv = -EFAULT;
 725                         break;
 726                 }
 727                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 728                     greqs.gsr_source.ss_family != AF_INET6) {
 729                         retv = -EADDRNOTAVAIL;
 730                         break;
 731                 }
 732                 if (optname == MCAST_BLOCK_SOURCE) {
 733                         omode = MCAST_EXCLUDE;
 734                         add = 1;
 735                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 736                         omode = MCAST_EXCLUDE;
 737                         add = 0;
 738                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 739                         struct sockaddr_in6 *psin6;
 740
 741                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 742                         retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
 743                                                      &psin6->sin6_addr,
 744                                                      MCAST_INCLUDE);
 745                         /* prior join w/ different source is ok */
 746                         if (retv && retv != -EADDRINUSE)
 747                                 break;
 748                         omode = MCAST_INCLUDE;
 749                         add = 1;
 750                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 751                         omode = MCAST_INCLUDE;
 752                         add = 0;
 753                 }
 754                 retv = ip6_mc_source(add, omode, sk, &greqs);
 755                 break;
 756         }
 757         case MCAST_MSFILTER:
 758         {
 759                 struct group_filter *gsf;
 760
 761                 if (optlen < GROUP_FILTER_SIZE(0))
 762                         goto e_inval;
 763                 if (optlen > sysctl_optmem_max) {
 764                         retv = -ENOBUFS;
 765                         break;
 766                 }
 767                 gsf = memdup_user(optval, optlen);
 768                 if (IS_ERR(gsf)) {
 769                         retv = PTR_ERR(gsf);
 770                         break;
 771                 }
 772                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 773                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 774                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 775                         kfree(gsf);
 776                         retv = -ENOBUFS;
 777                         break;
 778                 }
 779                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 780                         kfree(gsf);
 781                         retv = -EINVAL;
 782                         break;
 783                 }
 784                 retv = ip6_mc_msfilter(sk, gsf);
 785                 kfree(gsf);
 786
 787                 break;
 788         }
 789         case IPV6_ROUTER_ALERT:
 790                 if (optlen < sizeof(int))
 791                         goto e_inval;
 792                 retv = ip6_ra_control(sk, val);
 793                 break;
 794         case IPV6_ROUTER_ALERT_ISOLATE:
 795                 if (optlen < sizeof(int))
 796                         goto e_inval;
 797                 np->rtalert_isolate = valbool;
 798                 retv = 0;
 799                 break;
 800         case IPV6_MTU_DISCOVER:
 801                 if (optlen < sizeof(int))
 802                         goto e_inval;
 803                 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
 804                         goto e_inval;
 805                 np->pmtudisc = val;
 806                 retv = 0;
 807                 break;
 808         case IPV6_MTU:
 809                 if (optlen < sizeof(int))
 810                         goto e_inval;
 811                 if (val && val < IPV6_MIN_MTU)
 812                         goto e_inval;
 813                 np->frag_size = val;
 814                 retv = 0;
 815                 break;
 816         case IPV6_RECVERR:
 817                 if (optlen < sizeof(int))
 818                         goto e_inval;
 819                 np->recverr = valbool;
 820                 if (!val)
 821                         skb_queue_purge(&sk->sk_error_queue);
 822                 retv = 0;
 823                 break;
 824         case IPV6_FLOWINFO_SEND:
 825                 if (optlen < sizeof(int))
 826                         goto e_inval;
 827                 np->sndflow = valbool;
 828                 retv = 0;
 829                 break;
 830         case IPV6_FLOWLABEL_MGR:
 831                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 832                 break;
 833         case IPV6_IPSEC_POLICY:
 834         case IPV6_XFRM_POLICY:
 835                 retv = -EPERM;
 836                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 837                         break;
 838                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 839                 break;
 840
 841         case IPV6_ADDR_PREFERENCES:
 842             {
 843                 unsigned int pref = 0;
 844                 unsigned int prefmask = ~0;
 845
 846                 if (optlen < sizeof(int))
 847                         goto e_inval;
 848
 849                 retv = -EINVAL;
 850
 851                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 852                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 853                                IPV6_PREFER_SRC_TMP|
 854                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 855                 case IPV6_PREFER_SRC_PUBLIC:
 856                         pref |= IPV6_PREFER_SRC_PUBLIC;
 857                         break;
 858                 case IPV6_PREFER_SRC_TMP:
 859                         pref |= IPV6_PREFER_SRC_TMP;
 860                         break;
 861                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 862                         break;
 863                 case 0:
 864                         goto pref_skip_pubtmp;
 865                 default:
 866                         goto e_inval;
 867                 }
 868
 869                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 870                               IPV6_PREFER_SRC_TMP);
 871 pref_skip_pubtmp:
 872
 873                 /* check HOME/COA conflicts */
 874                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 875                 case IPV6_PREFER_SRC_HOME:
 876                         break;
 877                 case IPV6_PREFER_SRC_COA:
 878                         pref |= IPV6_PREFER_SRC_COA;
 879                 case 0:
 880                         goto pref_skip_coa;
 881                 default:
 882                         goto e_inval;
 883                 }
 884
 885                 prefmask &= ~IPV6_PREFER_SRC_COA;
 886 pref_skip_coa:
 887
 888                 /* check CGA/NONCGA conflicts */
 889                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 890                 case IPV6_PREFER_SRC_CGA:
 891                 case IPV6_PREFER_SRC_NONCGA:
 892                 case 0:
 893                         break;
 894                 default:
 895                         goto e_inval;
 896                 }
 897
 898                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 899                 retv = 0;
 900
 901                 break;
 902             }
 903         case IPV6_MINHOPCOUNT:
 904                 if (optlen < sizeof(int))
 905                         goto e_inval;
 906                 if (val < 0 || val > 255)
 907                         goto e_inval;
 908                 np->min_hopcount = val;
 909                 retv = 0;
 910                 break;
 911         case IPV6_DONTFRAG:
 912                 np->dontfrag = valbool;
 913                 retv = 0;
 914                 break;
 915         case IPV6_AUTOFLOWLABEL:
 916                 np->autoflowlabel = valbool;
 917                 np->autoflowlabel_set = 1;
 918                 retv = 0;
 919                 break;
 920         case IPV6_RECVFRAGSIZE:
 921                 np->rxopt.bits.recvfragsize = valbool;
 922                 retv = 0;
 923                 break;
 924         }
 925
 926         release_sock(sk);
 927         if (needs_rtnl)
 928                 rtnl_unlock();
 929
 930         return retv;
 931
 932 e_inval:
 933         release_sock(sk);
 934         if (needs_rtnl)
 935                 rtnl_unlock();
 936         return -EINVAL;
 937 }
 938
 939 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 940                     char __user *optval, unsigned int optlen)
 941 {
 942         int err;
 943
 944         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 945                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 946
 947         if (level != SOL_IPV6)
 948                 return -ENOPROTOOPT;
 949
 950         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 951 #ifdef CONFIG_NETFILTER
 952         /* we need to exclude all possible ENOPROTOOPTs except default case */
 953         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 954                         optname != IPV6_XFRM_POLICY)
 955                 err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
 956 #endif
 957         return err;
 958 }
 959 EXPORT_SYMBOL(ipv6_setsockopt);
 960
 961 #ifdef CONFIG_COMPAT
 962 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 963                            char __user *optval, unsigned int optlen)
 964 {
 965         int err;
 966
 967         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 968                 if (udp_prot.compat_setsockopt != NULL)
 969                         return udp_prot.compat_setsockopt(sk, level, optname,
 970                                                           optval, optlen);
 971                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 972         }
 973
 974         if (level != SOL_IPV6)
 975                 return -ENOPROTOOPT;
 976
 977         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 978                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 979                         ipv6_setsockopt);
 980
 981         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 982 #ifdef CONFIG_NETFILTER
 983         /* we need to exclude all possible ENOPROTOOPTs except default case */
 984         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 985             optname != IPV6_XFRM_POLICY)
 986                 err = compat_nf_setsockopt(sk, PF_INET6, optname, optval,
 987                                            optlen);
 988 #endif
 989         return err;
 990 }
 991 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 992 #endif
 993
 994 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 995                                   int optname, char __user *optval, int len)
 996 {
 997         struct ipv6_opt_hdr *hdr;
 998
 999         if (!opt)
1000                 return 0;
1001
1002         switch (optname) {
1003         case IPV6_HOPOPTS:
1004                 hdr = opt->hopopt;
1005                 break;
1006         case IPV6_RTHDRDSTOPTS:
1007                 hdr = opt->dst0opt;
1008                 break;
1009         case IPV6_RTHDR:
1010                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
1011                 break;
1012         case IPV6_DSTOPTS:
1013                 hdr = opt->dst1opt;
1014                 break;
1015         default:
1016                 return -EINVAL; /* should not happen */
1017         }
1018
1019         if (!hdr)
1020                 return 0;
1021
1022         len = min_t(unsigned int, len, ipv6_optlen(hdr));
1023         if (copy_to_user(optval, hdr, len))
1024                 return -EFAULT;
1025         return len;
1026 }
1027
1028 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
1029                     char __user *optval, int __user *optlen, unsigned int flags)
1030 {
1031         struct ipv6_pinfo *np = inet6_sk(sk);
1032         int len;
1033         int val;
1034
1035         if (ip6_mroute_opt(optname))
1036                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
1037
1038         if (get_user(len, optlen))
1039                 return -EFAULT;
1040         switch (optname) {
1041         case IPV6_ADDRFORM:
1042                 if (sk->sk_protocol != IPPROTO_UDP &&
1043                     sk->sk_protocol != IPPROTO_UDPLITE &&
1044                     sk->sk_protocol != IPPROTO_TCP)
1045                         return -ENOPROTOOPT;
1046                 if (sk->sk_state != TCP_ESTABLISHED)
1047                         return -ENOTCONN;
1048                 val = sk->sk_family;
1049                 break;
1050         case MCAST_MSFILTER:
1051         {
1052                 struct group_filter gsf;
1053                 int err;
1054
1055                 if (len < GROUP_FILTER_SIZE(0))
1056                         return -EINVAL;
1057                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
1058                         return -EFAULT;
1059                 if (gsf.gf_group.ss_family != AF_INET6)
1060                         return -EADDRNOTAVAIL;
1061                 lock_sock(sk);
1062                 err = ip6_mc_msfget(sk, &gsf,
1063                         (struct group_filter __user *)optval, optlen);
1064                 release_sock(sk);
1065                 return err;
1066         }
1067
1068         case IPV6_2292PKTOPTIONS:
1069         {
1070                 struct msghdr msg;
1071                 struct sk_buff *skb;
1072
1073                 if (sk->sk_type != SOCK_STREAM)
1074                         return -ENOPROTOOPT;
1075
1076                 msg.msg_control = optval;
1077                 msg.msg_controllen = len;
1078                 msg.msg_flags = flags;
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