git.oblomov.eu Git - linux-2.6/blob - 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  *      $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 extern int ip6_mc_source(int add, int omode, struct sock *sk,
 113         struct group_source_req *pgsr);
 114 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 115 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 116         struct group_filter __user *optval, int __user *optlen);
 117
 118
 119 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 120                     char __user *optval, int optlen)
 121 {
 122         struct ipv6_pinfo *np = inet6_sk(sk);
 123         int val, valbool;
 124         int retv = -ENOPROTOOPT;
 125
 126         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 127                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 128
 129         if(level!=SOL_IPV6)
 130                 goto out;
 131
 132         if (optval == NULL)
 133                 val=0;
 134         else if (get_user(val, (int __user *) optval))
 135                 return -EFAULT;
 136
 137         valbool = (val!=0);
 138
 139         lock_sock(sk);
 140
 141         switch (optname) {
 142
 143         case IPV6_ADDRFORM:
 144                 if (val == PF_INET) {
 145                         struct ipv6_txoptions *opt;
 146                         struct sk_buff *pktopt;
 147
 148                         if (sk->sk_protocol != IPPROTO_UDP &&
 149                             sk->sk_protocol != IPPROTO_TCP)
 150                                 break;
 151
 152                         if (sk->sk_state != TCP_ESTABLISHED) {
 153                                 retv = -ENOTCONN;
 154                                 break;
 155                         }
 156
 157                         if (ipv6_only_sock(sk) ||
 158                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 159                                 retv = -EADDRNOTAVAIL;
 160                                 break;
 161                         }
 162
 163                         fl6_free_socklist(sk);
 164                         ipv6_sock_mc_close(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 #ifdef INET_REFCNT_DEBUG
 196                         atomic_dec(&inet6_sock_nr);
 197 #endif
 198                         module_put(THIS_MODULE);
 199                         retv = 0;
 200                         break;
 201                 }
 202                 goto e_inval;
 203
 204         case IPV6_V6ONLY:
 205                 if (inet_sk(sk)->num)
 206                         goto e_inval;
 207                 np->ipv6only = valbool;
 208                 retv = 0;
 209                 break;
 210
 211         case IPV6_PKTINFO:
 212                 np->rxopt.bits.rxinfo = valbool;
 213                 retv = 0;
 214                 break;
 215
 216         case IPV6_HOPLIMIT:
 217                 np->rxopt.bits.rxhlim = valbool;
 218                 retv = 0;
 219                 break;
 220
 221         case IPV6_RTHDR:
 222                 if (val < 0 || val > 2)
 223                         goto e_inval;
 224                 np->rxopt.bits.srcrt = val;
 225                 retv = 0;
 226                 break;
 227
 228         case IPV6_HOPOPTS:
 229                 np->rxopt.bits.hopopts = valbool;
 230                 retv = 0;
 231                 break;
 232
 233         case IPV6_DSTOPTS:
 234                 np->rxopt.bits.dstopts = valbool;
 235                 retv = 0;
 236                 break;
 237
 238         case IPV6_FLOWINFO:
 239                 np->rxopt.bits.rxflow = valbool;
 240                 retv = 0;
 241                 break;
 242
 243         case IPV6_PKTOPTIONS:
 244         {
 245                 struct ipv6_txoptions *opt = NULL;
 246                 struct msghdr msg;
 247                 struct flowi fl;
 248                 int junk;
 249
 250                 fl.fl6_flowlabel = 0;
 251                 fl.oif = sk->sk_bound_dev_if;
 252
 253                 if (optlen == 0)
 254                         goto update;
 255
 256                 /* 1K is probably excessive
 257                  * 1K is surely not enough, 2K per standard header is 16K.
 258                  */
 259                 retv = -EINVAL;
 260                 if (optlen > 64*1024)
 261                         break;
 262
 263                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 264                 retv = -ENOBUFS;
 265                 if (opt == NULL)
 266                         break;
 267
 268                 memset(opt, 0, sizeof(*opt));
 269                 opt->tot_len = sizeof(*opt) + optlen;
 270                 retv = -EFAULT;
 271                 if (copy_from_user(opt+1, optval, optlen))
 272                         goto done;
 273
 274                 msg.msg_controllen = optlen;
 275                 msg.msg_control = (void*)(opt+1);
 276
 277                 retv = datagram_send_ctl(&msg, &fl, opt, &junk);
 278                 if (retv)
 279                         goto done;
 280 update:
 281                 retv = 0;
 282                 if (sk->sk_type == SOCK_STREAM) {
 283                         if (opt) {
 284                                 struct tcp_sock *tp = tcp_sk(sk);
 285                                 if (!((1 << sk->sk_state) &
 286                                       (TCPF_LISTEN | TCPF_CLOSE))
 287                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 288                                         tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
 289                                         tcp_sync_mss(sk, tp->pmtu_cookie);
 290                                 }
 291                         }
 292                         opt = xchg(&np->opt, opt);
 293                         sk_dst_reset(sk);
 294                 } else {
 295                         write_lock(&sk->sk_dst_lock);
 296                         opt = xchg(&np->opt, opt);
 297                         write_unlock(&sk->sk_dst_lock);
 298                         sk_dst_reset(sk);
 299                 }
 300
 301 done:
 302                 if (opt)
 303                         sock_kfree_s(sk, opt, opt->tot_len);
 304                 break;
 305         }
 306         case IPV6_UNICAST_HOPS:
 307                 if (val > 255 || val < -1)
 308                         goto e_inval;
 309                 np->hop_limit = val;
 310                 retv = 0;
 311                 break;
 312
 313         case IPV6_MULTICAST_HOPS:
 314                 if (sk->sk_type == SOCK_STREAM)
 315                         goto e_inval;
 316                 if (val > 255 || val < -1)
 317                         goto e_inval;
 318                 np->mcast_hops = val;
 319                 retv = 0;
 320                 break;
 321
 322         case IPV6_MULTICAST_LOOP:
 323                 np->mc_loop = valbool;
 324                 retv = 0;
 325                 break;
 326
 327         case IPV6_MULTICAST_IF:
 328                 if (sk->sk_type == SOCK_STREAM)
 329                         goto e_inval;
 330                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 331                         goto e_inval;
 332
 333                 if (__dev_get_by_index(val) == NULL) {
 334                         retv = -ENODEV;
 335                         break;
 336                 }
 337                 np->mcast_oif = val;
 338                 retv = 0;
 339                 break;
 340         case IPV6_ADD_MEMBERSHIP:
 341         case IPV6_DROP_MEMBERSHIP:
 342         {
 343                 struct ipv6_mreq mreq;
 344
 345                 retv = -EFAULT;
 346                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 347                         break;
 348
 349                 if (optname == IPV6_ADD_MEMBERSHIP)
 350                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 351                 else
 352                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 353                 break;
 354         }
 355         case IPV6_JOIN_ANYCAST:
 356         case IPV6_LEAVE_ANYCAST:
 357         {
 358                 struct ipv6_mreq mreq;
 359
 360                 if (optlen != sizeof(struct ipv6_mreq))
 361                         goto e_inval;
 362
 363                 retv = -EFAULT;
 364                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 365                         break;
 366
 367                 if (optname == IPV6_JOIN_ANYCAST)
 368                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 369                 else
 370                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 371                 break;
 372         }
 373         case MCAST_JOIN_GROUP:
 374         case MCAST_LEAVE_GROUP:
 375         {
 376                 struct group_req greq;
 377                 struct sockaddr_in6 *psin6;
 378
 379                 retv = -EFAULT;
 380                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 381                         break;
 382                 if (greq.gr_group.ss_family != AF_INET6) {
 383                         retv = -EADDRNOTAVAIL;
 384                         break;
 385                 }
 386                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 387                 if (optname == MCAST_JOIN_GROUP)
 388                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 389                                 &psin6->sin6_addr);
 390                 else
 391                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 392                                 &psin6->sin6_addr);
 393                 break;
 394         }
 395         case MCAST_JOIN_SOURCE_GROUP:
 396         case MCAST_LEAVE_SOURCE_GROUP:
 397         case MCAST_BLOCK_SOURCE:
 398         case MCAST_UNBLOCK_SOURCE:
 399         {
 400                 struct group_source_req greqs;
 401                 int omode, add;
 402
 403                 if (optlen != sizeof(struct group_source_req))
 404                         goto e_inval;
 405                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 406                         retv = -EFAULT;
 407                         break;
 408                 }
 409                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 410                     greqs.gsr_source.ss_family != AF_INET6) {
 411                         retv = -EADDRNOTAVAIL;
 412                         break;
 413                 }
 414                 if (optname == MCAST_BLOCK_SOURCE) {
 415                         omode = MCAST_EXCLUDE;
 416                         add = 1;
 417                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 418                         omode = MCAST_EXCLUDE;
 419                         add = 0;
 420                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 421                         struct sockaddr_in6 *psin6;
 422
 423                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 424                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 425                                 &psin6->sin6_addr);
 426                         if (retv)
 427                                 break;
 428                         omode = MCAST_INCLUDE;
 429                         add = 1;
 430                 } else /*IP_DROP_SOURCE_MEMBERSHIP */ {
 431                         omode = MCAST_INCLUDE;
 432                         add = 0;
 433                 }
 434                 retv = ip6_mc_source(add, omode, sk, &greqs);
 435                 break;
 436         }
 437         case MCAST_MSFILTER:
 438         {
 439                 extern int sysctl_optmem_max;
 440                 extern int sysctl_mld_max_msf;
 441                 struct group_filter *gsf;
 442
 443                 if (optlen < GROUP_FILTER_SIZE(0))
 444                         goto e_inval;
 445                 if (optlen > sysctl_optmem_max) {
 446                         retv = -ENOBUFS;
 447                         break;
 448                 }
 449                 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
 450                 if (gsf == 0) {
 451                         retv = -ENOBUFS;
 452                         break;
 453                 }
 454                 retv = -EFAULT;
 455                 if (copy_from_user(gsf, optval, optlen)) {
 456                         kfree(gsf);
 457                         break;
 458                 }
 459                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 460                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 461                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 462                         kfree(gsf);
 463                         retv = -ENOBUFS;
 464                         break;
 465                 }
 466                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 467                         kfree(gsf);
 468                         retv = -EINVAL;
 469                         break;
 470                 }
 471                 retv = ip6_mc_msfilter(sk, gsf);
 472                 kfree(gsf);
 473
 474                 break;
 475         }
 476         case IPV6_ROUTER_ALERT:
 477                 retv = ip6_ra_control(sk, val, NULL);
 478                 break;
 479         case IPV6_MTU_DISCOVER:
 480                 if (val<0 || val>2)
 481                         goto e_inval;
 482                 np->pmtudisc = val;
 483                 retv = 0;
 484                 break;
 485         case IPV6_MTU:
 486                 if (val && val < IPV6_MIN_MTU)
 487                         goto e_inval;
 488                 np->frag_size = val;
 489                 retv = 0;
 490                 break;
 491         case IPV6_RECVERR:
 492                 np->recverr = valbool;
 493                 if (!val)
 494                         skb_queue_purge(&sk->sk_error_queue);
 495                 retv = 0;
 496                 break;
 497         case IPV6_FLOWINFO_SEND:
 498                 np->sndflow = valbool;
 499                 retv = 0;
 500                 break;
 501         case IPV6_FLOWLABEL_MGR:
 502                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 503                 break;
 504         case IPV6_IPSEC_POLICY:
 505         case IPV6_XFRM_POLICY:
 506                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 507                 break;
 508
 509 #ifdef CONFIG_NETFILTER
 510         default:
 511                 retv = nf_setsockopt(sk, PF_INET6, optname, optval,
 512                                             optlen);
 513                 break;
 514 #endif
 515
 516         }
 517         release_sock(sk);
 518
 519 out:
 520         return retv;
 521
 522 e_inval:
 523         release_sock(sk);
 524         return -EINVAL;
 525 }
 526
 527 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 528                     char __user *optval, int __user *optlen)
 529 {
 530         struct ipv6_pinfo *np = inet6_sk(sk);
 531         int len;
 532         int val;
 533
 534         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 535                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 536         if(level!=SOL_IPV6)
 537                 return -ENOPROTOOPT;
 538         if (get_user(len, optlen))
 539                 return -EFAULT;
 540         switch (optname) {
 541         case IPV6_ADDRFORM:
 542                 if (sk->sk_protocol != IPPROTO_UDP &&
 543                     sk->sk_protocol != IPPROTO_TCP)
 544                         return -EINVAL;
 545                 if (sk->sk_state != TCP_ESTABLISHED)
 546                         return -ENOTCONN;
 547                 val = sk->sk_family;
 548                 break;
 549         case MCAST_MSFILTER:
 550         {
 551                 struct group_filter gsf;
 552                 int err;
 553
 554                 if (len < GROUP_FILTER_SIZE(0))
 555                         return -EINVAL;
 556                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 557                         return -EFAULT;
 558                 lock_sock(sk);
 559                 err = ip6_mc_msfget(sk, &gsf,
 560                         (struct group_filter __user *)optval, optlen);
 561                 release_sock(sk);
 562                 return err;
 563         }
 564
 565         case IPV6_PKTOPTIONS:
 566         {
 567                 struct msghdr msg;
 568                 struct sk_buff *skb;
 569
 570                 if (sk->sk_type != SOCK_STREAM)
 571                         return -ENOPROTOOPT;
 572
 573                 msg.msg_control = optval;
 574                 msg.msg_controllen = len;
 575                 msg.msg_flags = 0;
 576
 577                 lock_sock(sk);
 578                 skb = np->pktoptions;
 579                 if (skb)
 580                         atomic_inc(&skb->users);
 581                 release_sock(sk);
 582
 583                 if (skb) {
 584                         int err = datagram_recv_ctl(sk, &msg, skb);
 585                         kfree_skb(skb);
 586                         if (err)
 587                                 return err;
 588                 } else {
 589                         if (np->rxopt.bits.rxinfo) {
 590                                 struct in6_pktinfo src_info;
 591                                 src_info.ipi6_ifindex = np->mcast_oif;
 592                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 593                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 594                         }
 595                         if (np->rxopt.bits.rxhlim) {
 596                                 int hlim = np->mcast_hops;
 597                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 598                         }
 599                 }
 600                 len -= msg.msg_controllen;
 601                 return put_user(len, optlen);
 602         }
 603         case IPV6_MTU:
 604         {
 605                 struct dst_entry *dst;
 606                 val = 0;
 607                 lock_sock(sk);
 608                 dst = sk_dst_get(sk);
 609                 if (dst) {
 610                         val = dst_mtu(dst);
 611                         dst_release(dst);
 612                 }
 613                 release_sock(sk);
 614                 if (!val)
 615                         return -ENOTCONN;
 616                 break;
 617         }
 618
 619         case IPV6_V6ONLY:
 620                 val = np->ipv6only;
 621                 break;
 622
 623         case IPV6_PKTINFO:
 624                 val = np->rxopt.bits.rxinfo;
 625                 break;
 626
 627         case IPV6_HOPLIMIT:
 628                 val = np->rxopt.bits.rxhlim;
 629                 break;
 630
 631         case IPV6_RTHDR:
 632                 val = np->rxopt.bits.srcrt;
 633                 break;
 634
 635         case IPV6_HOPOPTS:
 636                 val = np->rxopt.bits.hopopts;
 637                 break;
 638
 639         case IPV6_DSTOPTS:
 640                 val = np->rxopt.bits.dstopts;
 641                 break;
 642
 643         case IPV6_FLOWINFO:
 644                 val = np->rxopt.bits.rxflow;
 645                 break;
 646
 647         case IPV6_UNICAST_HOPS:
 648                 val = np->hop_limit;
 649                 break;
 650
 651         case IPV6_MULTICAST_HOPS:
 652                 val = np->mcast_hops;
 653                 break;
 654
 655         case IPV6_MULTICAST_LOOP:
 656                 val = np->mc_loop;
 657                 break;
 658
 659         case IPV6_MULTICAST_IF:
 660                 val = np->mcast_oif;
 661                 break;
 662
 663         case IPV6_MTU_DISCOVER:
 664                 val = np->pmtudisc;
 665                 break;
 666
 667         case IPV6_RECVERR:
 668                 val = np->recverr;
 669                 break;
 670
 671         case IPV6_FLOWINFO_SEND:
 672                 val = np->sndflow;
 673                 break;
 674
 675         default:
 676 #ifdef CONFIG_NETFILTER
 677                 lock_sock(sk);
 678                 val = nf_getsockopt(sk, PF_INET6, optname, optval,
 679                                     &len);
 680                 release_sock(sk);
 681                 if (val >= 0)
 682                         val = put_user(len, optlen);
 683                 return val;
 684 #else
 685                 return -EINVAL;
 686 #endif
 687         }
 688         len = min_t(unsigned int, sizeof(int), len);
 689         if(put_user(len, optlen))
 690                 return -EFAULT;
 691         if(copy_to_user(optval,&val,len))
 692                 return -EFAULT;
 693         return 0;
 694 }
 695
 696 void __init ipv6_packet_init(void)
 697 {
 698         dev_add_pack(&ipv6_packet_type);
 699 }
 700
 701 void ipv6_packet_cleanup(void)
 702 {
 703         dev_remove_pack(&ipv6_packet_type);
 704 }