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   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  *      $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  *      FIXME: Make the setsockopt code POSIX compliant: That is
  18  *
  19  *      o       Return -EINVAL for setsockopt of short lengths
  20  *      o       Truncate getsockopt returns
  21  *      o       Return an optlen of the truncated length if need be
  22  *
  23  *      Changes:
  24  *      David L Stevens <dlstevens@us.ibm.com>:
  25  *              - added multicast source filtering API for MLDv2
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/config.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/socket.h>
  33 #include <linux/sockios.h>
  34 #include <linux/sched.h>
  35 #include <linux/net.h>
  36 #include <linux/in6.h>
  37 #include <linux/netdevice.h>
  38 #include <linux/if_arp.h>
  39 #include <linux/init.h>
  40 #include <linux/sysctl.h>
  41 #include <linux/netfilter.h>
  42
  43 #include <net/sock.h>
  44 #include <net/snmp.h>
  45 #include <net/ipv6.h>
  46 #include <net/ndisc.h>
  47 #include <net/protocol.h>
  48 #include <net/transp_v6.h>
  49 #include <net/ip6_route.h>
  50 #include <net/addrconf.h>
  51 #include <net/inet_common.h>
  52 #include <net/tcp.h>
  53 #include <net/udp.h>
  54 #include <net/xfrm.h>
  55
  56 #include <asm/uaccess.h>
  57
  58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
  59
  60 static struct packet_type ipv6_packet_type = {
  61         .type = __constant_htons(ETH_P_IPV6),
  62         .func = ipv6_rcv,
  63 };
  64
  65 struct ip6_ra_chain *ip6_ra_chain;
  66 DEFINE_RWLOCK(ip6_ra_lock);
  67
  68 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
  69 {
  70         struct ip6_ra_chain *ra, *new_ra, **rap;
  71
  72         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  73         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
  74                 return -EINVAL;
  75
  76         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  77
  78         write_lock_bh(&ip6_ra_lock);
  79         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  80                 if (ra->sk == sk) {
  81                         if (sel>=0) {
  82                                 write_unlock_bh(&ip6_ra_lock);
  83                                 if (new_ra)
  84                                         kfree(new_ra);
  85                                 return -EADDRINUSE;
  86                         }
  87
  88                         *rap = ra->next;
  89                         write_unlock_bh(&ip6_ra_lock);
  90
  91                         if (ra->destructor)
  92                                 ra->destructor(sk);
  93                         sock_put(sk);
  94                         kfree(ra);
  95                         return 0;
  96                 }
  97         }
  98         if (new_ra == NULL) {
  99                 write_unlock_bh(&ip6_ra_lock);
 100                 return -ENOBUFS;
 101         }
 102         new_ra->sk = sk;
 103         new_ra->sel = sel;
 104         new_ra->destructor = destructor;
 105         new_ra->next = ra;
 106         *rap = new_ra;
 107         sock_hold(sk);
 108         write_unlock_bh(&ip6_ra_lock);
 109         return 0;
 110 }
 111
 112 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 113                     char __user *optval, int optlen)
 114 {
 115         struct ipv6_pinfo *np = inet6_sk(sk);
 116         int val, valbool;
 117         int retv = -ENOPROTOOPT;
 118
 119         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 120                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 121
 122         if(level!=SOL_IPV6)
 123                 goto out;
 124
 125         if (optval == NULL)
 126                 val=0;
 127         else if (get_user(val, (int __user *) optval))
 128                 return -EFAULT;
 129
 130         valbool = (val!=0);
 131
 132         lock_sock(sk);
 133
 134         switch (optname) {
 135
 136         case IPV6_ADDRFORM:
 137                 if (val == PF_INET) {
 138                         struct ipv6_txoptions *opt;
 139                         struct sk_buff *pktopt;
 140
 141                         if (sk->sk_protocol != IPPROTO_UDP &&
 142                             sk->sk_protocol != IPPROTO_TCP)
 143                                 break;
 144
 145                         if (sk->sk_state != TCP_ESTABLISHED) {
 146                                 retv = -ENOTCONN;
 147                                 break;
 148                         }
 149
 150                         if (ipv6_only_sock(sk) ||
 151                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 152                                 retv = -EADDRNOTAVAIL;
 153                                 break;
 154                         }
 155
 156                         fl6_free_socklist(sk);
 157                         ipv6_sock_mc_close(sk);
 158
 159                         /*
 160                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 161                          * remove it from the refcnt debug socks count in the
 162                          * original family...
 163                          */
 164                         sk_refcnt_debug_dec(sk);
 165
 166                         if (sk->sk_protocol == IPPROTO_TCP) {
 167                                 struct tcp_sock *tp = tcp_sk(sk);
 168
 169                                 local_bh_disable();
 170                                 sock_prot_dec_use(sk->sk_prot);
 171                                 sock_prot_inc_use(&tcp_prot);
 172                                 local_bh_enable();
 173                                 sk->sk_prot = &tcp_prot;
 174                                 tp->af_specific = &ipv4_specific;
 175                                 sk->sk_socket->ops = &inet_stream_ops;
 176                                 sk->sk_family = PF_INET;
 177                                 tcp_sync_mss(sk, tp->pmtu_cookie);
 178                         } else {
 179                                 local_bh_disable();
 180                                 sock_prot_dec_use(sk->sk_prot);
 181                                 sock_prot_inc_use(&udp_prot);
 182                                 local_bh_enable();
 183                                 sk->sk_prot = &udp_prot;
 184                                 sk->sk_socket->ops = &inet_dgram_ops;
 185                                 sk->sk_family = PF_INET;
 186                         }
 187                         opt = xchg(&np->opt, NULL);
 188                         if (opt)
 189                                 sock_kfree_s(sk, opt, opt->tot_len);
 190                         pktopt = xchg(&np->pktoptions, NULL);
 191                         if (pktopt)
 192                                 kfree_skb(pktopt);
 193
 194                         sk->sk_destruct = inet_sock_destruct;
 195                         /*
 196                          * ... and add it to the refcnt debug socks count
 197                          * in the new family. -acme
 198                          */
 199                         sk_refcnt_debug_inc(sk);
 200                         module_put(THIS_MODULE);
 201                         retv = 0;
 202                         break;
 203                 }
 204                 goto e_inval;
 205
 206         case IPV6_V6ONLY:
 207                 if (inet_sk(sk)->num)
 208                         goto e_inval;
 209                 np->ipv6only = valbool;
 210                 retv = 0;
 211                 break;
 212
 213         case IPV6_PKTINFO:
 214                 np->rxopt.bits.rxinfo = valbool;
 215                 retv = 0;
 216                 break;
 217
 218         case IPV6_HOPLIMIT:
 219                 np->rxopt.bits.rxhlim = valbool;
 220                 retv = 0;
 221                 break;
 222
 223         case IPV6_RTHDR:
 224                 if (val < 0 || val > 2)
 225                         goto e_inval;
 226                 np->rxopt.bits.srcrt = val;
 227                 retv = 0;
 228                 break;
 229
 230         case IPV6_HOPOPTS:
 231                 np->rxopt.bits.hopopts = valbool;
 232                 retv = 0;
 233                 break;
 234
 235         case IPV6_DSTOPTS:
 236                 np->rxopt.bits.dstopts = valbool;
 237                 retv = 0;
 238                 break;
 239
 240         case IPV6_FLOWINFO:
 241                 np->rxopt.bits.rxflow = valbool;
 242                 retv = 0;
 243                 break;
 244
 245         case IPV6_PKTOPTIONS:
 246         {
 247                 struct ipv6_txoptions *opt = NULL;
 248                 struct msghdr msg;
 249                 struct flowi fl;
 250                 int junk;
 251
 252                 fl.fl6_flowlabel = 0;
 253                 fl.oif = sk->sk_bound_dev_if;
 254
 255                 if (optlen == 0)
 256                         goto update;
 257
 258                 /* 1K is probably excessive
 259                  * 1K is surely not enough, 2K per standard header is 16K.
 260                  */
 261                 retv = -EINVAL;
 262                 if (optlen > 64*1024)
 263                         break;
 264
 265                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 266                 retv = -ENOBUFS;
 267                 if (opt == NULL)
 268                         break;
 269
 270                 memset(opt, 0, sizeof(*opt));
 271                 opt->tot_len = sizeof(*opt) + optlen;
 272                 retv = -EFAULT;
 273                 if (copy_from_user(opt+1, optval, optlen))
 274                         goto done;
 275
 276                 msg.msg_controllen = optlen;
 277                 msg.msg_control = (void*)(opt+1);
 278
 279                 retv = datagram_send_ctl(&msg, &fl, opt, &junk);
 280                 if (retv)
 281                         goto done;
 282 update:
 283                 retv = 0;
 284                 if (sk->sk_type == SOCK_STREAM) {
 285                         if (opt) {
 286                                 struct tcp_sock *tp = tcp_sk(sk);
 287                                 if (!((1 << sk->sk_state) &
 288                                       (TCPF_LISTEN | TCPF_CLOSE))
 289                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 290                                         tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
 291                                         tcp_sync_mss(sk, tp->pmtu_cookie);
 292                                 }
 293                         }
 294                         opt = xchg(&np->opt, opt);
 295                         sk_dst_reset(sk);
 296                 } else {
 297                         write_lock(&sk->sk_dst_lock);
 298                         opt = xchg(&np->opt, opt);
 299                         write_unlock(&sk->sk_dst_lock);
 300                         sk_dst_reset(sk);
 301                 }
 302
 303 done:
 304                 if (opt)
 305                         sock_kfree_s(sk, opt, opt->tot_len);
 306                 break;
 307         }
 308         case IPV6_UNICAST_HOPS:
 309                 if (val > 255 || val < -1)
 310                         goto e_inval;
 311                 np->hop_limit = val;
 312                 retv = 0;
 313                 break;
 314
 315         case IPV6_MULTICAST_HOPS:
 316                 if (sk->sk_type == SOCK_STREAM)
 317                         goto e_inval;
 318                 if (val > 255 || val < -1)
 319                         goto e_inval;
 320                 np->mcast_hops = val;
 321                 retv = 0;
 322                 break;
 323
 324         case IPV6_MULTICAST_LOOP:
 325                 np->mc_loop = valbool;
 326                 retv = 0;
 327                 break;
 328
 329         case IPV6_MULTICAST_IF:
 330                 if (sk->sk_type == SOCK_STREAM)
 331                         goto e_inval;
 332                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 333                         goto e_inval;
 334
 335                 if (__dev_get_by_index(val) == NULL) {
 336                         retv = -ENODEV;
 337                         break;
 338                 }
 339                 np->mcast_oif = val;
 340                 retv = 0;
 341                 break;
 342         case IPV6_ADD_MEMBERSHIP:
 343         case IPV6_DROP_MEMBERSHIP:
 344         {
 345                 struct ipv6_mreq mreq;
 346
 347                 retv = -EFAULT;
 348                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 349                         break;
 350
 351                 if (optname == IPV6_ADD_MEMBERSHIP)
 352                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 353                 else
 354                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 355                 break;
 356         }
 357         case IPV6_JOIN_ANYCAST:
 358         case IPV6_LEAVE_ANYCAST:
 359         {
 360                 struct ipv6_mreq mreq;
 361
 362                 if (optlen != sizeof(struct ipv6_mreq))
 363                         goto e_inval;
 364
 365                 retv = -EFAULT;
 366                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 367                         break;
 368
 369                 if (optname == IPV6_JOIN_ANYCAST)
 370                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 371                 else
 372                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 373                 break;
 374         }
 375         case MCAST_JOIN_GROUP:
 376         case MCAST_LEAVE_GROUP:
 377         {
 378                 struct group_req greq;
 379                 struct sockaddr_in6 *psin6;
 380
 381                 retv = -EFAULT;
 382                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 383                         break;
 384                 if (greq.gr_group.ss_family != AF_INET6) {
 385                         retv = -EADDRNOTAVAIL;
 386                         break;
 387                 }
 388                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 389                 if (optname == MCAST_JOIN_GROUP)
 390                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 391                                 &psin6->sin6_addr);
 392                 else
 393                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 394                                 &psin6->sin6_addr);
 395                 break;
 396         }
 397         case MCAST_JOIN_SOURCE_GROUP:
 398         case MCAST_LEAVE_SOURCE_GROUP:
 399         case MCAST_BLOCK_SOURCE:
 400         case MCAST_UNBLOCK_SOURCE:
 401         {
 402                 struct group_source_req greqs;
 403                 int omode, add;
 404
 405                 if (optlen != sizeof(struct group_source_req))
 406                         goto e_inval;
 407                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 408                         retv = -EFAULT;
 409                         break;
 410                 }
 411                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 412                     greqs.gsr_source.ss_family != AF_INET6) {
 413                         retv = -EADDRNOTAVAIL;
 414                         break;
 415                 }
 416                 if (optname == MCAST_BLOCK_SOURCE) {
 417                         omode = MCAST_EXCLUDE;
 418                         add = 1;
 419                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 420                         omode = MCAST_EXCLUDE;
 421                         add = 0;
 422                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 423                         struct sockaddr_in6 *psin6;
 424
 425                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 426                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 427                                 &psin6->sin6_addr);
 428                         /* prior join w/ different source is ok */
 429                         if (retv && retv != -EADDRINUSE)
 430                                 break;
 431                         omode = MCAST_INCLUDE;
 432                         add = 1;
 433                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 434                         omode = MCAST_INCLUDE;
 435                         add = 0;
 436                 }
 437                 retv = ip6_mc_source(add, omode, sk, &greqs);
 438                 break;
 439         }
 440         case MCAST_MSFILTER:
 441         {
 442                 extern int sysctl_mld_max_msf;
 443                 struct group_filter *gsf;
 444
 445                 if (optlen < GROUP_FILTER_SIZE(0))
 446                         goto e_inval;
 447                 if (optlen > sysctl_optmem_max) {
 448                         retv = -ENOBUFS;
 449                         break;
 450                 }
 451                 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
 452                 if (gsf == 0) {
 453                         retv = -ENOBUFS;
 454                         break;
 455                 }
 456                 retv = -EFAULT;
 457                 if (copy_from_user(gsf, optval, optlen)) {
 458                         kfree(gsf);
 459                         break;
 460                 }
 461                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 462                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 463                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 464                         kfree(gsf);
 465                         retv = -ENOBUFS;
 466                         break;
 467                 }
 468                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 469                         kfree(gsf);
 470                         retv = -EINVAL;
 471                         break;
 472                 }
 473                 retv = ip6_mc_msfilter(sk, gsf);
 474                 kfree(gsf);
 475
 476                 break;
 477         }
 478         case IPV6_ROUTER_ALERT:
 479                 retv = ip6_ra_control(sk, val, NULL);
 480                 break;
 481         case IPV6_MTU_DISCOVER:
 482                 if (val<0 || val>2)
 483                         goto e_inval;
 484                 np->pmtudisc = val;
 485                 retv = 0;
 486                 break;
 487         case IPV6_MTU:
 488                 if (val && val < IPV6_MIN_MTU)
 489                         goto e_inval;
 490                 np->frag_size = val;
 491                 retv = 0;
 492                 break;
 493         case IPV6_RECVERR:
 494                 np->recverr = valbool;
 495                 if (!val)
 496                         skb_queue_purge(&sk->sk_error_queue);
 497                 retv = 0;
 498                 break;
 499         case IPV6_FLOWINFO_SEND:
 500                 np->sndflow = valbool;
 501                 retv = 0;
 502                 break;
 503         case IPV6_FLOWLABEL_MGR:
 504                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 505                 break;
 506         case IPV6_IPSEC_POLICY:
 507         case IPV6_XFRM_POLICY:
 508                 retv = -EPERM;
 509                 if (!capable(CAP_NET_ADMIN))
 510                         break;
 511                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 512                 break;
 513
 514 #ifdef CONFIG_NETFILTER
 515         default:
 516                 retv = nf_setsockopt(sk, PF_INET6, optname, optval,
 517                                             optlen);
 518                 break;
 519 #endif
 520
 521         }
 522         release_sock(sk);
 523
 524 out:
 525         return retv;
 526
 527 e_inval:
 528         release_sock(sk);
 529         return -EINVAL;
 530 }
 531
 532 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 533                     char __user *optval, int __user *optlen)
 534 {
 535         struct ipv6_pinfo *np = inet6_sk(sk);
 536         int len;
 537         int val;
 538
 539         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 540                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 541         if(level!=SOL_IPV6)
 542                 return -ENOPROTOOPT;
 543         if (get_user(len, optlen))
 544                 return -EFAULT;
 545         switch (optname) {
 546         case IPV6_ADDRFORM:
 547                 if (sk->sk_protocol != IPPROTO_UDP &&
 548                     sk->sk_protocol != IPPROTO_TCP)
 549                         return -EINVAL;
 550                 if (sk->sk_state != TCP_ESTABLISHED)
 551                         return -ENOTCONN;
 552                 val = sk->sk_family;
 553                 break;
 554         case MCAST_MSFILTER:
 555         {
 556                 struct group_filter gsf;
 557                 int err;
 558
 559                 if (len < GROUP_FILTER_SIZE(0))
 560                         return -EINVAL;
 561                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 562                         return -EFAULT;
 563                 lock_sock(sk);
 564                 err = ip6_mc_msfget(sk, &gsf,
 565                         (struct group_filter __user *)optval, optlen);
 566                 release_sock(sk);
 567                 return err;
 568         }
 569
 570         case IPV6_PKTOPTIONS:
 571         {
 572                 struct msghdr msg;
 573                 struct sk_buff *skb;
 574
 575                 if (sk->sk_type != SOCK_STREAM)
 576                         return -ENOPROTOOPT;
 577
 578                 msg.msg_control = optval;
 579                 msg.msg_controllen = len;
 580                 msg.msg_flags = 0;
 581
 582                 lock_sock(sk);
 583                 skb = np->pktoptions;
 584                 if (skb)
 585                         atomic_inc(&skb->users);
 586                 release_sock(sk);
 587
 588                 if (skb) {
 589                         int err = datagram_recv_ctl(sk, &msg, skb);
 590                         kfree_skb(skb);
 591                         if (err)
 592                                 return err;
 593                 } else {
 594                         if (np->rxopt.bits.rxinfo) {
 595                                 struct in6_pktinfo src_info;
 596                                 src_info.ipi6_ifindex = np->mcast_oif;
 597                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 598                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 599                         }
 600                         if (np->rxopt.bits.rxhlim) {
 601                                 int hlim = np->mcast_hops;
 602                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 603                         }
 604                 }
 605                 len -= msg.msg_controllen;
 606                 return put_user(len, optlen);
 607         }
 608         case IPV6_MTU:
 609         {
 610                 struct dst_entry *dst;
 611                 val = 0;
 612                 lock_sock(sk);
 613                 dst = sk_dst_get(sk);
 614                 if (dst) {
 615                         val = dst_mtu(dst);
 616                         dst_release(dst);
 617                 }
 618                 release_sock(sk);
 619                 if (!val)
 620                         return -ENOTCONN;
 621                 break;
 622         }
 623
 624         case IPV6_V6ONLY:
 625                 val = np->ipv6only;
 626                 break;
 627
 628         case IPV6_PKTINFO:
 629                 val = np->rxopt.bits.rxinfo;
 630                 break;
 631
 632         case IPV6_HOPLIMIT:
 633                 val = np->rxopt.bits.rxhlim;
 634                 break;
 635
 636         case IPV6_RTHDR:
 637                 val = np->rxopt.bits.srcrt;
 638                 break;
 639
 640         case IPV6_HOPOPTS:
 641                 val = np->rxopt.bits.hopopts;
 642                 break;
 643
 644         case IPV6_DSTOPTS:
 645                 val = np->rxopt.bits.dstopts;
 646                 break;
 647
 648         case IPV6_FLOWINFO:
 649                 val = np->rxopt.bits.rxflow;
 650                 break;
 651
 652         case IPV6_UNICAST_HOPS:
 653                 val = np->hop_limit;
 654                 break;
 655
 656         case IPV6_MULTICAST_HOPS:
 657                 val = np->mcast_hops;
 658                 break;
 659
 660         case IPV6_MULTICAST_LOOP:
 661                 val = np->mc_loop;
 662                 break;
 663
 664         case IPV6_MULTICAST_IF:
 665                 val = np->mcast_oif;
 666                 break;
 667
 668         case IPV6_MTU_DISCOVER:
 669                 val = np->pmtudisc;
 670                 break;
 671
 672         case IPV6_RECVERR:
 673                 val = np->recverr;
 674                 break;
 675
 676         case IPV6_FLOWINFO_SEND:
 677                 val = np->sndflow;
 678                 break;
 679
 680         default:
 681 #ifdef CONFIG_NETFILTER
 682                 lock_sock(sk);
 683                 val = nf_getsockopt(sk, PF_INET6, optname, optval,
 684                                     &len);
 685                 release_sock(sk);
 686                 if (val >= 0)
 687                         val = put_user(len, optlen);
 688                 return val;
 689 #else
 690                 return -EINVAL;
 691 #endif
 692         }
 693         len = min_t(unsigned int, sizeof(int), len);
 694         if(put_user(len, optlen))
 695                 return -EFAULT;
 696         if(copy_to_user(optval,&val,len))
 697                 return -EFAULT;
 698         return 0;
 699 }
 700
 701 void __init ipv6_packet_init(void)
 702 {
 703         dev_add_pack(&ipv6_packet_type);
 704 }
 705
 706 void ipv6_packet_cleanup(void)
 707 {
 708         dev_remove_pack(&ipv6_packet_type);
 709 }