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