SAFE public projects git trees. - safe/jmp/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) __read_mostly;
  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_RECVPKTINFO:
 214                 np->rxopt.bits.rxinfo = valbool;
 215                 retv = 0;
 216                 break;
 217
 218         case IPV6_2292PKTINFO:
 219                 np->rxopt.bits.rxoinfo = valbool;
 220                 retv = 0;
 221                 break;
 222
 223         case IPV6_RECVHOPLIMIT:
 224                 np->rxopt.bits.rxhlim = valbool;
 225                 retv = 0;
 226                 break;
 227
 228         case IPV6_2292HOPLIMIT:
 229                 np->rxopt.bits.rxohlim = valbool;
 230                 retv = 0;
 231                 break;
 232
 233         case IPV6_RECVRTHDR:
 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_2292RTHDR:
 241                 if (val < 0 || val > 2)
 242                         goto e_inval;
 243                 np->rxopt.bits.osrcrt = val;
 244                 retv = 0;
 245                 break;
 246
 247         case IPV6_RECVHOPOPTS:
 248                 np->rxopt.bits.hopopts = valbool;
 249                 retv = 0;
 250                 break;
 251
 252         case IPV6_2292HOPOPTS:
 253                 np->rxopt.bits.ohopopts = valbool;
 254                 retv = 0;
 255                 break;
 256
 257         case IPV6_RECVDSTOPTS:
 258                 np->rxopt.bits.dstopts = valbool;
 259                 retv = 0;
 260                 break;
 261
 262         case IPV6_2292DSTOPTS:
 263                 np->rxopt.bits.odstopts = valbool;
 264                 retv = 0;
 265                 break;
 266
 267         case IPV6_TCLASS:
 268                 if (val < 0 || val > 0xff)
 269                         goto e_inval;
 270                 np->tclass = val;
 271                 retv = 0;
 272                 break;
 273
 274         case IPV6_RECVTCLASS:
 275                 np->rxopt.bits.rxtclass = valbool;
 276                 retv = 0;
 277                 break;
 278
 279         case IPV6_FLOWINFO:
 280                 np->rxopt.bits.rxflow = valbool;
 281                 retv = 0;
 282                 break;
 283
 284         case IPV6_HOPOPTS:
 285         case IPV6_RTHDRDSTOPTS:
 286         case IPV6_RTHDR:
 287         case IPV6_DSTOPTS:
 288         {
 289                 struct ipv6_txoptions *opt;
 290                 if (optlen == 0)
 291                         optval = 0;
 292
 293                 /* hop-by-hop / destination options are privileged option */
 294                 retv = -EPERM;
 295                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 296                         break;
 297
 298                 retv = -EINVAL;
 299                 if (optlen & 0x7 || optlen > 8 * 255)
 300                         break;
 301
 302                 opt = ipv6_renew_options(sk, np->opt, optname,
 303                                          (struct ipv6_opt_hdr __user *)optval,
 304                                          optlen);
 305                 if (IS_ERR(opt)) {
 306                         retv = PTR_ERR(opt);
 307                         break;
 308                 }
 309
 310                 /* routing header option needs extra check */
 311                 if (optname == IPV6_RTHDR && opt->srcrt) {
 312                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 313                         if (rthdr->type)
 314                                 goto sticky_done;
 315                         if ((rthdr->hdrlen & 1) ||
 316                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 317                                 goto sticky_done;
 318                 }
 319
 320                 retv = 0;
 321                 if (sk->sk_type == SOCK_STREAM) {
 322                         if (opt) {
 323                                 struct tcp_sock *tp = tcp_sk(sk);
 324                                 if (!((1 << sk->sk_state) &
 325                                       (TCPF_LISTEN | TCPF_CLOSE))
 326                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 327                                         tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
 328                                         tcp_sync_mss(sk, tp->pmtu_cookie);
 329                                 }
 330                         }
 331                         opt = xchg(&np->opt, opt);
 332                         sk_dst_reset(sk);
 333                 } else {
 334                         write_lock(&sk->sk_dst_lock);
 335                         opt = xchg(&np->opt, opt);
 336                         write_unlock(&sk->sk_dst_lock);
 337                         sk_dst_reset(sk);
 338                 }
 339 sticky_done:
 340                 if (opt)
 341                         sock_kfree_s(sk, opt, opt->tot_len);
 342                 break;
 343         }
 344
 345         case IPV6_2292PKTOPTIONS:
 346         {
 347                 struct ipv6_txoptions *opt = NULL;
 348                 struct msghdr msg;
 349                 struct flowi fl;
 350                 int junk;
 351
 352                 fl.fl6_flowlabel = 0;
 353                 fl.oif = sk->sk_bound_dev_if;
 354
 355                 if (optlen == 0)
 356                         goto update;
 357
 358                 /* 1K is probably excessive
 359                  * 1K is surely not enough, 2K per standard header is 16K.
 360                  */
 361                 retv = -EINVAL;
 362                 if (optlen > 64*1024)
 363                         break;
 364
 365                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 366                 retv = -ENOBUFS;
 367                 if (opt == NULL)
 368                         break;
 369
 370                 memset(opt, 0, sizeof(*opt));
 371                 opt->tot_len = sizeof(*opt) + optlen;
 372                 retv = -EFAULT;
 373                 if (copy_from_user(opt+1, optval, optlen))
 374                         goto done;
 375
 376                 msg.msg_controllen = optlen;
 377                 msg.msg_control = (void*)(opt+1);
 378
 379                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 380                 if (retv)
 381                         goto done;
 382 update:
 383                 retv = 0;
 384                 if (sk->sk_type == SOCK_STREAM) {
 385                         if (opt) {
 386                                 struct tcp_sock *tp = tcp_sk(sk);
 387                                 if (!((1 << sk->sk_state) &
 388                                       (TCPF_LISTEN | TCPF_CLOSE))
 389                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 390                                         tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
 391                                         tcp_sync_mss(sk, tp->pmtu_cookie);
 392                                 }
 393                         }
 394                         opt = xchg(&np->opt, opt);
 395                         sk_dst_reset(sk);
 396                 } else {
 397                         write_lock(&sk->sk_dst_lock);
 398                         opt = xchg(&np->opt, opt);
 399                         write_unlock(&sk->sk_dst_lock);
 400                         sk_dst_reset(sk);
 401                 }
 402
 403 done:
 404                 if (opt)
 405                         sock_kfree_s(sk, opt, opt->tot_len);
 406                 break;
 407         }
 408         case IPV6_UNICAST_HOPS:
 409                 if (val > 255 || val < -1)
 410                         goto e_inval;
 411                 np->hop_limit = val;
 412                 retv = 0;
 413                 break;
 414
 415         case IPV6_MULTICAST_HOPS:
 416                 if (sk->sk_type == SOCK_STREAM)
 417                         goto e_inval;
 418                 if (val > 255 || val < -1)
 419                         goto e_inval;
 420                 np->mcast_hops = val;
 421                 retv = 0;
 422                 break;
 423
 424         case IPV6_MULTICAST_LOOP:
 425                 np->mc_loop = valbool;
 426                 retv = 0;
 427                 break;
 428
 429         case IPV6_MULTICAST_IF:
 430                 if (sk->sk_type == SOCK_STREAM)
 431                         goto e_inval;
 432                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 433                         goto e_inval;
 434
 435                 if (__dev_get_by_index(val) == NULL) {
 436                         retv = -ENODEV;
 437                         break;
 438                 }
 439                 np->mcast_oif = val;
 440                 retv = 0;
 441                 break;
 442         case IPV6_ADD_MEMBERSHIP:
 443         case IPV6_DROP_MEMBERSHIP:
 444         {
 445                 struct ipv6_mreq mreq;
 446
 447                 retv = -EFAULT;
 448                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 449                         break;
 450
 451                 if (optname == IPV6_ADD_MEMBERSHIP)
 452                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 453                 else
 454                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 455                 break;
 456         }
 457         case IPV6_JOIN_ANYCAST:
 458         case IPV6_LEAVE_ANYCAST:
 459         {
 460                 struct ipv6_mreq mreq;
 461
 462                 if (optlen != sizeof(struct ipv6_mreq))
 463                         goto e_inval;
 464
 465                 retv = -EFAULT;
 466                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 467                         break;
 468
 469                 if (optname == IPV6_JOIN_ANYCAST)
 470                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 471                 else
 472                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 473                 break;
 474         }
 475         case MCAST_JOIN_GROUP:
 476         case MCAST_LEAVE_GROUP:
 477         {
 478                 struct group_req greq;
 479                 struct sockaddr_in6 *psin6;
 480
 481                 retv = -EFAULT;
 482                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 483                         break;
 484                 if (greq.gr_group.ss_family != AF_INET6) {
 485                         retv = -EADDRNOTAVAIL;
 486                         break;
 487                 }
 488                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 489                 if (optname == MCAST_JOIN_GROUP)
 490                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 491                                 &psin6->sin6_addr);
 492                 else
 493                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 494                                 &psin6->sin6_addr);
 495                 break;
 496         }
 497         case MCAST_JOIN_SOURCE_GROUP:
 498         case MCAST_LEAVE_SOURCE_GROUP:
 499         case MCAST_BLOCK_SOURCE:
 500         case MCAST_UNBLOCK_SOURCE:
 501         {
 502                 struct group_source_req greqs;
 503                 int omode, add;
 504
 505                 if (optlen != sizeof(struct group_source_req))
 506                         goto e_inval;
 507                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 508                         retv = -EFAULT;
 509                         break;
 510                 }
 511                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 512                     greqs.gsr_source.ss_family != AF_INET6) {
 513                         retv = -EADDRNOTAVAIL;
 514                         break;
 515                 }
 516                 if (optname == MCAST_BLOCK_SOURCE) {
 517                         omode = MCAST_EXCLUDE;
 518                         add = 1;
 519                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 520                         omode = MCAST_EXCLUDE;
 521                         add = 0;
 522                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 523                         struct sockaddr_in6 *psin6;
 524
 525                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 526                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 527                                 &psin6->sin6_addr);
 528                         /* prior join w/ different source is ok */
 529                         if (retv && retv != -EADDRINUSE)
 530                                 break;
 531                         omode = MCAST_INCLUDE;
 532                         add = 1;
 533                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 534                         omode = MCAST_INCLUDE;
 535                         add = 0;
 536                 }
 537                 retv = ip6_mc_source(add, omode, sk, &greqs);
 538                 break;
 539         }
 540         case MCAST_MSFILTER:
 541         {
 542                 extern int sysctl_mld_max_msf;
 543                 struct group_filter *gsf;
 544
 545                 if (optlen < GROUP_FILTER_SIZE(0))
 546                         goto e_inval;
 547                 if (optlen > sysctl_optmem_max) {
 548                         retv = -ENOBUFS;
 549                         break;
 550                 }
 551                 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
 552                 if (gsf == 0) {
 553                         retv = -ENOBUFS;
 554                         break;
 555                 }
 556                 retv = -EFAULT;
 557                 if (copy_from_user(gsf, optval, optlen)) {
 558                         kfree(gsf);
 559                         break;
 560                 }
 561                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 562                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 563                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 564                         kfree(gsf);
 565                         retv = -ENOBUFS;
 566                         break;
 567                 }
 568                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 569                         kfree(gsf);
 570                         retv = -EINVAL;
 571                         break;
 572                 }
 573                 retv = ip6_mc_msfilter(sk, gsf);
 574                 kfree(gsf);
 575
 576                 break;
 577         }
 578         case IPV6_ROUTER_ALERT:
 579                 retv = ip6_ra_control(sk, val, NULL);
 580                 break;
 581         case IPV6_MTU_DISCOVER:
 582                 if (val<0 || val>2)
 583                         goto e_inval;
 584                 np->pmtudisc = val;
 585                 retv = 0;
 586                 break;
 587         case IPV6_MTU:
 588                 if (val && val < IPV6_MIN_MTU)
 589                         goto e_inval;
 590                 np->frag_size = val;
 591                 retv = 0;
 592                 break;
 593         case IPV6_RECVERR:
 594                 np->recverr = valbool;
 595                 if (!val)
 596                         skb_queue_purge(&sk->sk_error_queue);
 597                 retv = 0;
 598                 break;
 599         case IPV6_FLOWINFO_SEND:
 600                 np->sndflow = valbool;
 601                 retv = 0;
 602                 break;
 603         case IPV6_FLOWLABEL_MGR:
 604                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 605                 break;
 606         case IPV6_IPSEC_POLICY:
 607         case IPV6_XFRM_POLICY:
 608                 retv = -EPERM;
 609                 if (!capable(CAP_NET_ADMIN))
 610                         break;
 611                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 612                 break;
 613
 614 #ifdef CONFIG_NETFILTER
 615         default:
 616                 retv = nf_setsockopt(sk, PF_INET6, optname, optval,
 617                                             optlen);
 618                 break;
 619 #endif
 620
 621         }
 622         release_sock(sk);
 623
 624 out:
 625         return retv;
 626
 627 e_inval:
 628         release_sock(sk);
 629         return -EINVAL;
 630 }
 631
 632 int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
 633                            char __user *optval, int len)
 634 {
 635         if (!hdr)
 636                 return 0;
 637         len = min_t(int, len, ipv6_optlen(hdr));
 638         if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
 639                 return -EFAULT;
 640         return len;
 641 }
 642
 643 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 644                     char __user *optval, int __user *optlen)
 645 {
 646         struct ipv6_pinfo *np = inet6_sk(sk);
 647         int len;
 648         int val;
 649
 650         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 651                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 652         if(level!=SOL_IPV6)
 653                 return -ENOPROTOOPT;
 654         if (get_user(len, optlen))
 655                 return -EFAULT;
 656         switch (optname) {
 657         case IPV6_ADDRFORM:
 658                 if (sk->sk_protocol != IPPROTO_UDP &&
 659                     sk->sk_protocol != IPPROTO_TCP)
 660                         return -EINVAL;
 661                 if (sk->sk_state != TCP_ESTABLISHED)
 662                         return -ENOTCONN;
 663                 val = sk->sk_family;
 664                 break;
 665         case MCAST_MSFILTER:
 666         {
 667                 struct group_filter gsf;
 668                 int err;
 669
 670                 if (len < GROUP_FILTER_SIZE(0))
 671                         return -EINVAL;
 672                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 673                         return -EFAULT;
 674                 lock_sock(sk);
 675                 err = ip6_mc_msfget(sk, &gsf,
 676                         (struct group_filter __user *)optval, optlen);
 677                 release_sock(sk);
 678                 return err;
 679         }
 680
 681         case IPV6_2292PKTOPTIONS:
 682         {
 683                 struct msghdr msg;
 684                 struct sk_buff *skb;
 685
 686                 if (sk->sk_type != SOCK_STREAM)
 687                         return -ENOPROTOOPT;
 688
 689                 msg.msg_control = optval;
 690                 msg.msg_controllen = len;
 691                 msg.msg_flags = 0;
 692
 693                 lock_sock(sk);
 694                 skb = np->pktoptions;
 695                 if (skb)
 696                         atomic_inc(&skb->users);
 697                 release_sock(sk);
 698
 699                 if (skb) {
 700                         int err = datagram_recv_ctl(sk, &msg, skb);
 701                         kfree_skb(skb);
 702                         if (err)
 703                                 return err;
 704                 } else {
 705                         if (np->rxopt.bits.rxinfo) {
 706                                 struct in6_pktinfo src_info;
 707                                 src_info.ipi6_ifindex = np->mcast_oif;
 708                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 709                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 710                         }
 711                         if (np->rxopt.bits.rxhlim) {
 712                                 int hlim = np->mcast_hops;
 713                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 714                         }
 715                         if (np->rxopt.bits.rxoinfo) {
 716                                 struct in6_pktinfo src_info;
 717                                 src_info.ipi6_ifindex = np->mcast_oif;
 718                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 719                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 720                         }
 721                         if (np->rxopt.bits.rxohlim) {
 722                                 int hlim = np->mcast_hops;
 723                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 724                         }
 725                 }
 726                 len -= msg.msg_controllen;
 727                 return put_user(len, optlen);
 728         }
 729         case IPV6_MTU:
 730         {
 731                 struct dst_entry *dst;
 732                 val = 0;
 733                 lock_sock(sk);
 734                 dst = sk_dst_get(sk);
 735                 if (dst) {
 736                         val = dst_mtu(dst);
 737                         dst_release(dst);
 738                 }
 739                 release_sock(sk);
 740                 if (!val)
 741                         return -ENOTCONN;
 742                 break;
 743         }
 744
 745         case IPV6_V6ONLY:
 746                 val = np->ipv6only;
 747                 break;
 748
 749         case IPV6_RECVPKTINFO:
 750                 val = np->rxopt.bits.rxinfo;
 751                 break;
 752
 753         case IPV6_2292PKTINFO:
 754                 val = np->rxopt.bits.rxoinfo;
 755                 break;
 756
 757         case IPV6_RECVHOPLIMIT:
 758                 val = np->rxopt.bits.rxhlim;
 759                 break;
 760
 761         case IPV6_2292HOPLIMIT:
 762                 val = np->rxopt.bits.rxohlim;
 763                 break;
 764
 765         case IPV6_RECVRTHDR:
 766                 val = np->rxopt.bits.srcrt;
 767                 break;
 768
 769         case IPV6_2292RTHDR:
 770                 val = np->rxopt.bits.osrcrt;
 771                 break;
 772
 773         case IPV6_HOPOPTS:
 774         case IPV6_RTHDRDSTOPTS:
 775         case IPV6_RTHDR:
 776         case IPV6_DSTOPTS:
 777         {
 778
 779                 lock_sock(sk);
 780                 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
 781                                              optval, len);
 782                 release_sock(sk);
 783                 return put_user(len, optlen);
 784         }
 785
 786         case IPV6_RECVHOPOPTS:
 787                 val = np->rxopt.bits.hopopts;
 788                 break;
 789
 790         case IPV6_2292HOPOPTS:
 791                 val = np->rxopt.bits.ohopopts;
 792                 break;
 793
 794         case IPV6_RECVDSTOPTS:
 795                 val = np->rxopt.bits.dstopts;
 796                 break;
 797
 798         case IPV6_2292DSTOPTS:
 799                 val = np->rxopt.bits.odstopts;
 800                 break;
 801
 802         case IPV6_TCLASS:
 803                 val = np->tclass;
 804                 break;
 805
 806         case IPV6_RECVTCLASS:
 807                 val = np->rxopt.bits.rxtclass;
 808                 break;
 809
 810         case IPV6_FLOWINFO:
 811                 val = np->rxopt.bits.rxflow;
 812                 break;
 813
 814         case IPV6_UNICAST_HOPS:
 815                 val = np->hop_limit;
 816                 break;
 817
 818         case IPV6_MULTICAST_HOPS:
 819                 val = np->mcast_hops;
 820                 break;
 821
 822         case IPV6_MULTICAST_LOOP:
 823                 val = np->mc_loop;
 824                 break;
 825
 826         case IPV6_MULTICAST_IF:
 827                 val = np->mcast_oif;
 828                 break;
 829
 830         case IPV6_MTU_DISCOVER:
 831                 val = np->pmtudisc;
 832                 break;
 833
 834         case IPV6_RECVERR:
 835                 val = np->recverr;
 836                 break;
 837
 838         case IPV6_FLOWINFO_SEND:
 839                 val = np->sndflow;
 840                 break;
 841
 842         default:
 843 #ifdef CONFIG_NETFILTER
 844                 lock_sock(sk);
 845                 val = nf_getsockopt(sk, PF_INET6, optname, optval,
 846                                     &len);
 847                 release_sock(sk);
 848                 if (val >= 0)
 849                         val = put_user(len, optlen);
 850                 return val;
 851 #else
 852                 return -EINVAL;
 853 #endif
 854         }
 855         len = min_t(unsigned int, sizeof(int), len);
 856         if(put_user(len, optlen))
 857                 return -EFAULT;
 858         if(copy_to_user(optval,&val,len))
 859                 return -EFAULT;
 860         return 0;
 861 }
 862
 863 void __init ipv6_packet_init(void)
 864 {
 865         dev_add_pack(&ipv6_packet_type);
 866 }
 867
 868 void ipv6_packet_cleanup(void)
 869 {
 870         dev_remove_pack(&ipv6_packet_type);
 871 }