net/ipv6/ipv6_sockglue.c

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