net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <pedro_m@yahoo.com>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      $Id: ipv6_sockglue.c,v 1.40 2001/09/18 22:29:10 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
  55 #include <asm/uaccess.h>
  56
  57 struct ipv6_mib ipv6_statistics[NR_CPUS*2];
  58
  59 struct packet_type ipv6_packet_type =
  60 {
  61         __constant_htons(ETH_P_IPV6),
  62         NULL,                                   /* All devices */
  63         ipv6_rcv,
  64         (void*)1,
  65         NULL
  66 };
  67
  68 /*
  69  *      addrconf module should be notifyed of a device going up
  70  */
  71 static struct notifier_block ipv6_dev_notf = {
  72         addrconf_notify,
  73         NULL,
  74         0
  75 };
  76
  77 struct ip6_ra_chain *ip6_ra_chain;
  78 rwlock_t ip6_ra_lock = RW_LOCK_UNLOCKED;
  79
  80 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
  81 {
  82         struct ip6_ra_chain *ra, *new_ra, **rap;
  83
  84         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  85         if (sk->type != SOCK_RAW || sk->num != IPPROTO_RAW)
  86                 return -EINVAL;
  87
  88         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  89
  90         write_lock_bh(&ip6_ra_lock);
  91         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  92                 if (ra->sk == sk) {
  93                         if (sel>=0) {
  94                                 write_unlock_bh(&ip6_ra_lock);
  95                                 if (new_ra)
  96                                         kfree(new_ra);
  97                                 return -EADDRINUSE;
  98                         }
  99
 100                         *rap = ra->next;
 101                         write_unlock_bh(&ip6_ra_lock);
 102
 103                         if (ra->destructor)
 104                                 ra->destructor(sk);
 105                         sock_put(sk);
 106                         kfree(ra);
 107                         return 0;
 108                 }
 109         }
 110         if (new_ra == NULL) {
 111                 write_unlock_bh(&ip6_ra_lock);
 112                 return -ENOBUFS;
 113         }
 114         new_ra->sk = sk;
 115         new_ra->sel = sel;
 116         new_ra->destructor = destructor;
 117         new_ra->next = ra;
 118         *rap = new_ra;
 119         sock_hold(sk);
 120         write_unlock_bh(&ip6_ra_lock);
 121         return 0;
 122 }
 123
 124 extern int ip6_mc_source(int add, int omode, struct sock *sk,
 125         struct group_source_req *pgsr);
 126 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 127 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 128         struct group_filter *optval, int *optlen);
 129
 130
 131 int ipv6_setsockopt(struct sock *sk, int level, int optname, char *optval,
 132                     int optlen)
 133 {
 134         struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
 135         int val, valbool;
 136         int retv = -ENOPROTOOPT;
 137
 138         if(level==SOL_IP && sk->type != SOCK_RAW)
 139                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 140
 141         if(level!=SOL_IPV6)
 142                 goto out;
 143
 144         if (optval == NULL)
 145                 val=0;
 146         else if (get_user(val, (int *) optval))
 147                 return -EFAULT;
 148
 149         valbool = (val!=0);
 150
 151         lock_sock(sk);
 152
 153         switch (optname) {
 154
 155         case IPV6_ADDRFORM:
 156                 if (val == PF_INET) {
 157                         struct ipv6_txoptions *opt;
 158                         struct sk_buff *pktopt;
 159
 160                         if (sk->protocol != IPPROTO_UDP &&
 161                             sk->protocol != IPPROTO_TCP)
 162                                 break;
 163
 164                         if (sk->state != TCP_ESTABLISHED) {
 165                                 retv = -ENOTCONN;
 166                                 break;
 167                         }
 168
 169                         if (ipv6_only_sock(sk) ||
 170                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 171                                 retv = -EADDRNOTAVAIL;
 172                                 break;
 173                         }
 174
 175                         fl6_free_socklist(sk);
 176                         ipv6_sock_mc_close(sk);
 177
 178                         if (sk->protocol == IPPROTO_TCP) {
 179                                 struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
 180
 181                                 local_bh_disable();
 182                                 sock_prot_dec_use(sk->prot);
 183                                 sock_prot_inc_use(&tcp_prot);
 184                                 local_bh_enable();
 185                                 sk->prot = &tcp_prot;
 186                                 tp->af_specific = &ipv4_specific;
 187                                 sk->socket->ops = &inet_stream_ops;
 188                                 sk->family = PF_INET;
 189                                 tcp_sync_mss(sk, tp->pmtu_cookie);
 190                         } else {
 191                                 local_bh_disable();
 192                                 sock_prot_dec_use(sk->prot);
 193                                 sock_prot_inc_use(&udp_prot);
 194                                 local_bh_enable();
 195                                 sk->prot = &udp_prot;
 196                                 sk->socket->ops = &inet_dgram_ops;
 197                                 sk->family = PF_INET;
 198                         }
 199                         opt = xchg(&np->opt, NULL);
 200                         if (opt)
 201                                 sock_kfree_s(sk, opt, opt->tot_len);
 202                         pktopt = xchg(&np->pktoptions, NULL);
 203                         if (pktopt)
 204                                 kfree_skb(pktopt);
 205
 206                         sk->destruct = inet_sock_destruct;
 207 #ifdef INET_REFCNT_DEBUG
 208                         atomic_dec(&inet6_sock_nr);
 209 #endif
 210                         MOD_DEC_USE_COUNT;
 211                         retv = 0;
 212                         break;
 213                 }
 214                 goto e_inval;
 215
 216         case IPV6_V6ONLY:
 217                 if (sk->num)
 218                         goto e_inval;
 219                 np->ipv6only = valbool;
 220                 retv = 0;
 221                 break;
 222
 223         case IPV6_PKTINFO:
 224                 np->rxopt.bits.rxinfo = valbool;
 225                 retv = 0;
 226                 break;
 227
 228         case IPV6_HOPLIMIT:
 229                 np->rxopt.bits.rxhlim = valbool;
 230                 retv = 0;
 231                 break;
 232
 233         case IPV6_RTHDR:
 234                 if (val < 0 || val > 2)
 235                         goto e_inval;
 236                 np->rxopt.bits.srcrt = val;
 237                 retv = 0;
 238                 break;
 239
 240         case IPV6_HOPOPTS:
 241                 np->rxopt.bits.hopopts = valbool;
 242                 retv = 0;
 243                 break;
 244
 245         case IPV6_AUTHHDR:
 246                 np->rxopt.bits.authhdr = valbool;
 247                 retv = 0;
 248                 break;
 249
 250         case IPV6_DSTOPTS:
 251                 np->rxopt.bits.dstopts = valbool;
 252                 retv = 0;
 253                 break;
 254
 255         case IPV6_FLOWINFO:
 256                 np->rxopt.bits.rxflow = valbool;
 257                 retv = 0;
 258                 break;
 259
 260         case IPV6_PKTOPTIONS:
 261         {
 262                 struct ipv6_txoptions *opt = NULL;
 263                 struct msghdr msg;
 264                 struct flowi fl;
 265                 int junk;
 266
 267                 fl.fl6_flowlabel = 0;
 268                 fl.oif = sk->bound_dev_if;
 269
 270                 if (optlen == 0)
 271                         goto update;
 272
 273                 /* 1K is probably excessive
 274                  * 1K is surely not enough, 2K per standard header is 16K.
 275                  */
 276                 retv = -EINVAL;
 277                 if (optlen > 64*1024)
 278                         break;
 279
 280                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 281                 retv = -ENOBUFS;
 282                 if (opt == NULL)
 283                         break;
 284
 285                 memset(opt, 0, sizeof(*opt));
 286                 opt->tot_len = sizeof(*opt) + optlen;
 287                 retv = -EFAULT;
 288                 if (copy_from_user(opt+1, optval, optlen))
 289                         goto done;
 290
 291                 msg.msg_controllen = optlen;
 292                 msg.msg_control = (void*)(opt+1);
 293
 294                 retv = datagram_send_ctl(&msg, &fl, opt, &junk);
 295                 if (retv)
 296                         goto done;
 297 update:
 298                 retv = 0;
 299                 if (sk->type == SOCK_STREAM) {
 300                         if (opt) {
 301                                 struct tcp_opt *tp = &sk->tp_pinfo.af_tcp;
 302                                 if (!((1<<sk->state)&(TCPF_LISTEN|TCPF_CLOSE))
 303                                     && sk->daddr != LOOPBACK4_IPV6) {
 304                                         tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
 305                                         tcp_sync_mss(sk, tp->pmtu_cookie);
 306                                 }
 307                         }
 308                         opt = xchg(&np->opt, opt);
 309                         sk_dst_reset(sk);
 310                 } else {
 311                         write_lock(&sk->dst_lock);
 312                         opt = xchg(&np->opt, opt);
 313                         write_unlock(&sk->dst_lock);
 314                         sk_dst_reset(sk);
 315                 }
 316
 317 done:
 318                 if (opt)
 319                         sock_kfree_s(sk, opt, opt->tot_len);
 320                 break;
 321         }
 322         case IPV6_UNICAST_HOPS:
 323                 if (val > 255 || val < -1)
 324                         goto e_inval;
 325                 np->hop_limit = val;
 326                 retv = 0;
 327                 break;
 328
 329         case IPV6_MULTICAST_HOPS:
 330                 if (sk->type == SOCK_STREAM)
 331                         goto e_inval;
 332                 if (val > 255 || val < -1)
 333                         goto e_inval;
 334                 np->mcast_hops = val;
 335                 retv = 0;
 336                 break;
 337
 338         case IPV6_MULTICAST_LOOP:
 339                 np->mc_loop = valbool;
 340                 retv = 0;
 341                 break;
 342
 343         case IPV6_MULTICAST_IF:
 344                 if (sk->type == SOCK_STREAM)
 345                         goto e_inval;
 346                 if (sk->bound_dev_if && sk->bound_dev_if != val)
 347                         goto e_inval;
 348
 349                 if (__dev_get_by_index(val) == NULL) {
 350                         retv = -ENODEV;
 351                         break;
 352                 }
 353                 np->mcast_oif = val;
 354                 retv = 0;
 355                 break;
 356         case IPV6_ADD_MEMBERSHIP:
 357         case IPV6_DROP_MEMBERSHIP:
 358         {
 359                 struct ipv6_mreq mreq;
 360
 361                 retv = -EFAULT;
 362                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 363                         break;
 364
 365                 if (optname == IPV6_ADD_MEMBERSHIP)
 366                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 367                 else
 368                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 369                 break;
 370         }
 371         case IPV6_JOIN_ANYCAST:
 372         case IPV6_LEAVE_ANYCAST:
 373         {
 374                 struct ipv6_mreq mreq;
 375
 376                 if (optlen != sizeof(struct ipv6_mreq))
 377                         goto e_inval;
 378
 379                 retv = -EFAULT;
 380                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 381                         break;
 382
 383                 if (optname == IPV6_JOIN_ANYCAST)
 384                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 385                 else
 386                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 387                 break;
 388         }
 389         case MCAST_JOIN_GROUP:
 390         case MCAST_LEAVE_GROUP:
 391         {
 392                 struct group_req greq;
 393                 struct sockaddr_in6 *psin6;
 394
 395                 retv = -EFAULT;
 396                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 397                         break;
 398                 if (greq.gr_group.ss_family != AF_INET6) {
 399                         retv = -EADDRNOTAVAIL;
 400                         break;
 401                 }
 402                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 403                 if (optname == MCAST_JOIN_GROUP)
 404                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 405                                 &psin6->sin6_addr);
 406                 else
 407                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 408                                 &psin6->sin6_addr);
 409                 break;
 410         }
 411         case MCAST_JOIN_SOURCE_GROUP:
 412         case MCAST_LEAVE_SOURCE_GROUP:
 413         case MCAST_BLOCK_SOURCE:
 414         case MCAST_UNBLOCK_SOURCE:
 415         {
 416                 struct group_source_req greqs;
 417                 int omode, add;
 418
 419                 if (optlen != sizeof(struct group_source_req))
 420                         goto e_inval;
 421                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 422                         retv = -EFAULT;
 423                         break;
 424                 }
 425                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 426                     greqs.gsr_source.ss_family != AF_INET6) {
 427                         retv = -EADDRNOTAVAIL;
 428                         break;
 429                 }
 430                 if (optname == MCAST_BLOCK_SOURCE) {
 431                         omode = MCAST_EXCLUDE;
 432                         add = 1;
 433                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 434                         omode = MCAST_EXCLUDE;
 435                         add = 0;
 436                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 437                         struct sockaddr_in6 *psin6;
 438
 439                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 440                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 441                                 &psin6->sin6_addr);
 442                         if (retv)
 443                                 break;
 444                         omode = MCAST_INCLUDE;
 445                         add = 1;
 446                 } else /*IP_DROP_SOURCE_MEMBERSHIP */ {
 447                         omode = MCAST_INCLUDE;
 448                         add = 0;
 449                 }
 450                 retv = ip6_mc_source(add, omode, sk, &greqs);
 451                 break;
 452         }
 453         case MCAST_MSFILTER:
 454         {
 455                 extern int sysctl_optmem_max;
 456                 extern int sysctl_mld_max_msf;
 457                 struct group_filter *gsf;
 458
 459                 if (optlen < GROUP_FILTER_SIZE(0))
 460                         goto e_inval;
 461                 if (optlen > sysctl_optmem_max) {
 462                         retv = -ENOBUFS;
 463                         break;
 464                 }
 465                 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
 466                 if (gsf == 0) {
 467                         retv = -ENOBUFS;
 468                         break;
 469                 }
 470                 retv = -EFAULT;
 471                 if (copy_from_user(gsf, optval, optlen)) {
 472                         kfree(gsf);
 473                         break;
 474                 }
 475                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 476                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 477                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 478                         kfree(gsf);
 479                         retv = -ENOBUFS;
 480                         break;
 481                 }
 482                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 483                         kfree(gsf);
 484                         retv = -EINVAL;
 485                         break;
 486                 }
 487                 retv = ip6_mc_msfilter(sk, gsf);
 488                 kfree(gsf);
 489
 490                 break;
 491         }
 492         case IPV6_ROUTER_ALERT:
 493                 retv = ip6_ra_control(sk, val, NULL);
 494                 break;
 495         case IPV6_MTU_DISCOVER:
 496                 if (val<0 || val>2)
 497                         goto e_inval;
 498                 np->pmtudisc = val;
 499                 retv = 0;
 500                 break;
 501         case IPV6_MTU:
 502                 if (val && val < IPV6_MIN_MTU)
 503                         goto e_inval;
 504                 np->frag_size = val;
 505                 retv = 0;
 506                 break;
 507         case IPV6_RECVERR:
 508                 np->recverr = valbool;
 509                 if (!val)
 510                         skb_queue_purge(&sk->error_queue);
 511                 retv = 0;
 512                 break;
 513         case IPV6_FLOWINFO_SEND:
 514                 np->sndflow = valbool;
 515                 retv = 0;
 516                 break;
 517         case IPV6_FLOWLABEL_MGR:
 518                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 519                 break;
 520
 521 #ifdef CONFIG_NETFILTER
 522         default:
 523                 retv = nf_setsockopt(sk, PF_INET6, optname, optval,
 524                                             optlen);
 525                 break;
 526 #endif
 527
 528         }
 529         release_sock(sk);
 530
 531 out:
 532         return retv;
 533
 534 e_inval:
 535         release_sock(sk);
 536         return -EINVAL;
 537 }
 538
 539 int ipv6_getsockopt(struct sock *sk, int level, int optname, char *optval,
 540                     int *optlen)
 541 {
 542         struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
 543         int len;
 544         int val;
 545
 546         if(level==SOL_IP && sk->type != SOCK_RAW)
 547                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 548         if(level!=SOL_IPV6)
 549                 return -ENOPROTOOPT;
 550         if (get_user(len, optlen))
 551                 return -EFAULT;
 552         switch (optname) {
 553         case IPV6_PKTOPTIONS:
 554         {
 555                 struct msghdr msg;
 556                 struct sk_buff *skb;
 557
 558                 if (sk->type != SOCK_STREAM)
 559                         return -ENOPROTOOPT;
 560
 561                 msg.msg_control = optval;
 562                 msg.msg_controllen = len;
 563                 msg.msg_flags = 0;
 564
 565                 lock_sock(sk);
 566                 skb = np->pktoptions;
 567                 if (skb)
 568                         atomic_inc(&skb->users);
 569                 release_sock(sk);
 570
 571                 if (skb) {
 572                         int err = datagram_recv_ctl(sk, &msg, skb);
 573                         kfree_skb(skb);
 574                         if (err)
 575                                 return err;
 576                 } else {
 577                         if (np->rxopt.bits.rxinfo) {
 578                                 struct in6_pktinfo src_info;
 579                                 src_info.ipi6_ifindex = np->mcast_oif;
 580                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 581                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 582                         }
 583                         if (np->rxopt.bits.rxhlim) {
 584                                 int hlim = np->mcast_hops;
 585                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 586                         }
 587                 }
 588                 len -= msg.msg_controllen;
 589                 return put_user(len, optlen);
 590         }
 591         case IPV6_MTU:
 592         {
 593                 struct dst_entry *dst;
 594                 val = 0;
 595                 lock_sock(sk);
 596                 dst = sk_dst_get(sk);
 597                 if (dst) {
 598                         val = dst->pmtu;
 599                         dst_release(dst);
 600                 }
 601                 release_sock(sk);
 602                 if (!val)
 603                         return -ENOTCONN;
 604                 break;
 605         }
 606
 607         case IPV6_V6ONLY:
 608                 val = np->ipv6only;
 609                 break;
 610
 611         case IPV6_PKTINFO:
 612                 val = np->rxopt.bits.rxinfo;
 613                 break;
 614         case MCAST_MSFILTER:
 615         {
 616                 struct group_filter gsf;
 617                 int err;
 618
 619                 if (len < GROUP_FILTER_SIZE(0))
 620                         return -EINVAL;
 621                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 622                         return -EFAULT;
 623                 lock_sock(sk);
 624                 err = ip6_mc_msfget(sk, &gsf,
 625                         (struct group_filter *)optval, optlen);
 626                 release_sock(sk);
 627                 return err;
 628         }
 629
 630         case IPV6_HOPLIMIT:
 631                 val = np->rxopt.bits.rxhlim;
 632                 break;
 633
 634         case IPV6_RTHDR:
 635                 val = np->rxopt.bits.srcrt;
 636                 break;
 637
 638         case IPV6_HOPOPTS:
 639                 val = np->rxopt.bits.hopopts;
 640                 break;
 641
 642         case IPV6_AUTHHDR:
 643                 val = np->rxopt.bits.authhdr;
 644                 break;
 645
 646         case IPV6_DSTOPTS:
 647                 val = np->rxopt.bits.dstopts;
 648                 break;
 649
 650         case IPV6_FLOWINFO:
 651                 val = np->rxopt.bits.rxflow;
 652                 break;
 653
 654         case IPV6_UNICAST_HOPS:
 655                 val = np->hop_limit;
 656                 break;
 657
 658         case IPV6_MULTICAST_HOPS:
 659                 val = np->mcast_hops;
 660                 break;
 661
 662         case IPV6_MULTICAST_LOOP:
 663                 val = np->mc_loop;
 664                 break;
 665
 666         case IPV6_MULTICAST_IF:
 667                 val = np->mcast_oif;
 668                 break;
 669
 670         case IPV6_MTU_DISCOVER:
 671                 val = np->pmtudisc;
 672                 break;
 673
 674         case IPV6_RECVERR:
 675                 val = np->recverr;
 676                 break;
 677
 678         case IPV6_FLOWINFO_SEND:
 679                 val = np->sndflow;
 680                 break;
 681
 682         default:
 683 #ifdef CONFIG_NETFILTER
 684                 lock_sock(sk);
 685                 val = nf_getsockopt(sk, PF_INET6, optname, optval,
 686                                     &len);
 687                 release_sock(sk);
 688                 if (val >= 0)
 689                         val = put_user(len, optlen);
 690                 return val;
 691 #else
 692                 return -EINVAL;
 693 #endif
 694         }
 695         len = min_t(unsigned int, sizeof(int), len);
 696         if(put_user(len, optlen))
 697                 return -EFAULT;
 698         if(copy_to_user(optval,&val,len))
 699                 return -EFAULT;
 700         return 0;
 701 }
 702
 703 #if defined(MODULE) && defined(CONFIG_SYSCTL)
 704
 705 /*
 706  *      sysctl registration functions defined in sysctl_net_ipv6.c
 707  */
 708
 709 extern void ipv6_sysctl_register(void);
 710 extern void ipv6_sysctl_unregister(void);
 711 #endif
 712
 713 void __init ipv6_packet_init(void)
 714 {
 715         dev_add_pack(&ipv6_packet_type);
 716 }
 717
 718 void __init ipv6_netdev_notif_init(void)
 719 {
 720         register_netdevice_notifier(&ipv6_dev_notf);
 721 }
 722
 723 #ifdef MODULE
 724 void ipv6_packet_cleanup(void)
 725 {
 726         dev_remove_pack(&ipv6_packet_type);
 727 }
 728
 729 void ipv6_netdev_notif_cleanup(void)
 730 {
 731         unregister_netdevice_notifier(&ipv6_dev_notf);
 732 }
 733 #endif