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                                 kfree(new_ra);
  84                                 return -EADDRINUSE;
  85                         }
  86
  87                         *rap = ra->next;
  88                         write_unlock_bh(&ip6_ra_lock);
  89
  90                         if (ra->destructor)
  91                                 ra->destructor(sk);
  92                         sock_put(sk);
  93                         kfree(ra);
  94                         return 0;
  95                 }
  96         }
  97         if (new_ra == NULL) {
  98                 write_unlock_bh(&ip6_ra_lock);
  99                 return -ENOBUFS;
 100         }
 101         new_ra->sk = sk;
 102         new_ra->sel = sel;
 103         new_ra->destructor = destructor;
 104         new_ra->next = ra;
 105         *rap = new_ra;
 106         sock_hold(sk);
 107         write_unlock_bh(&ip6_ra_lock);
 108         return 0;
 109 }
 110
 111 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 112                     char __user *optval, int optlen)
 113 {
 114         struct ipv6_pinfo *np = inet6_sk(sk);
 115         int val, valbool;
 116         int retv = -ENOPROTOOPT;
 117
 118         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 119                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 120
 121         if(level!=SOL_IPV6)
 122                 goto out;
 123
 124         if (optval == NULL)
 125                 val=0;
 126         else if (get_user(val, (int __user *) optval))
 127                 return -EFAULT;
 128
 129         valbool = (val!=0);
 130
 131         lock_sock(sk);
 132
 133         switch (optname) {
 134
 135         case IPV6_ADDRFORM:
 136                 if (val == PF_INET) {
 137                         struct ipv6_txoptions *opt;
 138                         struct sk_buff *pktopt;
 139
 140                         if (sk->sk_protocol != IPPROTO_UDP &&
 141                             sk->sk_protocol != IPPROTO_TCP)
 142                                 break;
 143
 144                         if (sk->sk_state != TCP_ESTABLISHED) {
 145                                 retv = -ENOTCONN;
 146                                 break;
 147                         }
 148
 149                         if (ipv6_only_sock(sk) ||
 150                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 151                                 retv = -EADDRNOTAVAIL;
 152                                 break;
 153                         }
 154
 155                         fl6_free_socklist(sk);
 156                         ipv6_sock_mc_close(sk);
 157
 158                         /*
 159                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 160                          * remove it from the refcnt debug socks count in the
 161                          * original family...
 162                          */
 163                         sk_refcnt_debug_dec(sk);
 164
 165                         if (sk->sk_protocol == IPPROTO_TCP) {
 166                                 struct inet_connection_sock *icsk = inet_csk(sk);
 167
 168                                 local_bh_disable();
 169                                 sock_prot_dec_use(sk->sk_prot);
 170                                 sock_prot_inc_use(&tcp_prot);
 171                                 local_bh_enable();
 172                                 sk->sk_prot = &tcp_prot;
 173                                 icsk->icsk_af_ops = &ipv4_specific;
 174                                 sk->sk_socket->ops = &inet_stream_ops;
 175                                 sk->sk_family = PF_INET;
 176                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 177                         } else {
 178                                 local_bh_disable();
 179                                 sock_prot_dec_use(sk->sk_prot);
 180                                 sock_prot_inc_use(&udp_prot);
 181                                 local_bh_enable();
 182                                 sk->sk_prot = &udp_prot;
 183                                 sk->sk_socket->ops = &inet_dgram_ops;
 184                                 sk->sk_family = PF_INET;
 185                         }
 186                         opt = xchg(&np->opt, NULL);
 187                         if (opt)
 188                                 sock_kfree_s(sk, opt, opt->tot_len);
 189                         pktopt = xchg(&np->pktoptions, NULL);
 190                         if (pktopt)
 191                                 kfree_skb(pktopt);
 192
 193                         sk->sk_destruct = inet_sock_destruct;
 194                         /*
 195                          * ... and add it to the refcnt debug socks count
 196                          * in the new family. -acme
 197                          */
 198                         sk_refcnt_debug_inc(sk);
 199                         module_put(THIS_MODULE);
 200                         retv = 0;
 201                         break;
 202                 }
 203                 goto e_inval;
 204
 205         case IPV6_V6ONLY:
 206                 if (inet_sk(sk)->num)
 207                         goto e_inval;
 208                 np->ipv6only = valbool;
 209                 retv = 0;
 210                 break;
 211
 212         case IPV6_RECVPKTINFO:
 213                 np->rxopt.bits.rxinfo = valbool;
 214                 retv = 0;
 215                 break;
 216
 217         case IPV6_2292PKTINFO:
 218                 np->rxopt.bits.rxoinfo = valbool;
 219                 retv = 0;
 220                 break;
 221
 222         case IPV6_RECVHOPLIMIT:
 223                 np->rxopt.bits.rxhlim = valbool;
 224                 retv = 0;
 225                 break;
 226
 227         case IPV6_2292HOPLIMIT:
 228                 np->rxopt.bits.rxohlim = valbool;
 229                 retv = 0;
 230                 break;
 231
 232         case IPV6_RECVRTHDR:
 233                 if (val < 0 || val > 2)
 234                         goto e_inval;
 235                 np->rxopt.bits.srcrt = val;
 236                 retv = 0;
 237                 break;
 238
 239         case IPV6_2292RTHDR:
 240                 if (val < 0 || val > 2)
 241                         goto e_inval;
 242                 np->rxopt.bits.osrcrt = val;
 243                 retv = 0;
 244                 break;
 245
 246         case IPV6_RECVHOPOPTS:
 247                 np->rxopt.bits.hopopts = valbool;
 248                 retv = 0;
 249                 break;
 250
 251         case IPV6_2292HOPOPTS:
 252                 np->rxopt.bits.ohopopts = valbool;
 253                 retv = 0;
 254                 break;
 255
 256         case IPV6_RECVDSTOPTS:
 257                 np->rxopt.bits.dstopts = valbool;
 258                 retv = 0;
 259                 break;
 260
 261         case IPV6_2292DSTOPTS:
 262                 np->rxopt.bits.odstopts = valbool;
 263                 retv = 0;
 264                 break;
 265
 266         case IPV6_TCLASS:
 267                 if (val < 0 || val > 0xff)
 268                         goto e_inval;
 269                 np->tclass = val;
 270                 retv = 0;
 271                 break;
 272
 273         case IPV6_RECVTCLASS:
 274                 np->rxopt.bits.rxtclass = valbool;
 275                 retv = 0;
 276                 break;
 277
 278         case IPV6_FLOWINFO:
 279                 np->rxopt.bits.rxflow = valbool;
 280                 retv = 0;
 281                 break;
 282
 283         case IPV6_HOPOPTS:
 284         case IPV6_RTHDRDSTOPTS:
 285         case IPV6_RTHDR:
 286         case IPV6_DSTOPTS:
 287         {
 288                 struct ipv6_txoptions *opt;
 289                 if (optlen == 0)
 290                         optval = NULL;
 291
 292                 /* hop-by-hop / destination options are privileged option */
 293                 retv = -EPERM;
 294                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 295                         break;
 296
 297                 retv = -EINVAL;
 298                 if (optlen & 0x7 || optlen > 8 * 255)
 299                         break;
 300
 301                 opt = ipv6_renew_options(sk, np->opt, optname,
 302                                          (struct ipv6_opt_hdr __user *)optval,
 303                                          optlen);
 304                 if (IS_ERR(opt)) {
 305                         retv = PTR_ERR(opt);
 306                         break;
 307                 }
 308
 309                 /* routing header option needs extra check */
 310                 if (optname == IPV6_RTHDR && opt->srcrt) {
 311                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 312                         if (rthdr->type)
 313                                 goto sticky_done;
 314                         if ((rthdr->hdrlen & 1) ||
 315                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 316                                 goto sticky_done;
 317                 }
 318
 319                 retv = 0;
 320                 if (inet_sk(sk)->is_icsk) {
 321                         if (opt) {
 322                                 struct inet_connection_sock *icsk = inet_csk(sk);
 323                                 if (!((1 << sk->sk_state) &
 324                                       (TCPF_LISTEN | TCPF_CLOSE))
 325                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 326                                         icsk->icsk_ext_hdr_len =
 327                                                 opt->opt_flen + opt->opt_nflen;
 328                                         icsk->icsk_sync_mss(sk, icsk->icsk_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 (inet_sk(sk)->is_icsk) {
 385                         if (opt) {
 386                                 struct inet_connection_sock *icsk = inet_csk(sk);
 387                                 if (!((1 << sk->sk_state) &
 388                                       (TCPF_LISTEN | TCPF_CLOSE))
 389                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 390                                         icsk->icsk_ext_hdr_len =
 391                                                 opt->opt_flen + opt->opt_nflen;
 392                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 393                                 }
 394                         }
 395                         opt = xchg(&np->opt, opt);
 396                         sk_dst_reset(sk);
 397                 } else {
 398                         write_lock(&sk->sk_dst_lock);
 399                         opt = xchg(&np->opt, opt);
 400                         write_unlock(&sk->sk_dst_lock);
 401                         sk_dst_reset(sk);
 402                 }
 403
 404 done:
 405                 if (opt)
 406                         sock_kfree_s(sk, opt, opt->tot_len);
 407                 break;
 408         }
 409         case IPV6_UNICAST_HOPS:
 410                 if (val > 255 || val < -1)
 411                         goto e_inval;
 412                 np->hop_limit = val;
 413                 retv = 0;
 414                 break;
 415
 416         case IPV6_MULTICAST_HOPS:
 417                 if (sk->sk_type == SOCK_STREAM)
 418                         goto e_inval;
 419                 if (val > 255 || val < -1)
 420                         goto e_inval;
 421                 np->mcast_hops = val;
 422                 retv = 0;
 423                 break;
 424
 425         case IPV6_MULTICAST_LOOP:
 426                 np->mc_loop = valbool;
 427                 retv = 0;
 428                 break;
 429
 430         case IPV6_MULTICAST_IF:
 431                 if (sk->sk_type == SOCK_STREAM)
 432                         goto e_inval;
 433                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 434                         goto e_inval;
 435
 436                 if (__dev_get_by_index(val) == NULL) {
 437                         retv = -ENODEV;
 438                         break;
 439                 }
 440                 np->mcast_oif = val;
 441                 retv = 0;
 442                 break;
 443         case IPV6_ADD_MEMBERSHIP:
 444         case IPV6_DROP_MEMBERSHIP:
 445         {
 446                 struct ipv6_mreq mreq;
 447
 448                 retv = -EFAULT;
 449                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 450                         break;
 451
 452                 if (optname == IPV6_ADD_MEMBERSHIP)
 453                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 454                 else
 455                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 456                 break;
 457         }
 458         case IPV6_JOIN_ANYCAST:
 459         case IPV6_LEAVE_ANYCAST:
 460         {
 461                 struct ipv6_mreq mreq;
 462
 463                 if (optlen != sizeof(struct ipv6_mreq))
 464                         goto e_inval;
 465
 466                 retv = -EFAULT;
 467                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 468                         break;
 469
 470                 if (optname == IPV6_JOIN_ANYCAST)
 471                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 472                 else
 473                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 474                 break;
 475         }
 476         case MCAST_JOIN_GROUP:
 477         case MCAST_LEAVE_GROUP:
 478         {
 479                 struct group_req greq;
 480                 struct sockaddr_in6 *psin6;
 481
 482                 retv = -EFAULT;
 483                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 484                         break;
 485                 if (greq.gr_group.ss_family != AF_INET6) {
 486                         retv = -EADDRNOTAVAIL;
 487                         break;
 488                 }
 489                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 490                 if (optname == MCAST_JOIN_GROUP)
 491                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 492                                 &psin6->sin6_addr);
 493                 else
 494                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 495                                 &psin6->sin6_addr);
 496                 break;
 497         }
 498         case MCAST_JOIN_SOURCE_GROUP:
 499         case MCAST_LEAVE_SOURCE_GROUP:
 500         case MCAST_BLOCK_SOURCE:
 501         case MCAST_UNBLOCK_SOURCE:
 502         {
 503                 struct group_source_req greqs;
 504                 int omode, add;
 505
 506                 if (optlen != sizeof(struct group_source_req))
 507                         goto e_inval;
 508                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 509                         retv = -EFAULT;
 510                         break;
 511                 }
 512                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 513                     greqs.gsr_source.ss_family != AF_INET6) {
 514                         retv = -EADDRNOTAVAIL;
 515                         break;
 516                 }
 517                 if (optname == MCAST_BLOCK_SOURCE) {
 518                         omode = MCAST_EXCLUDE;
 519                         add = 1;
 520                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 521                         omode = MCAST_EXCLUDE;
 522                         add = 0;
 523                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 524                         struct sockaddr_in6 *psin6;
 525
 526                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 527                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 528                                 &psin6->sin6_addr);
 529                         /* prior join w/ different source is ok */
 530                         if (retv && retv != -EADDRINUSE)
 531                                 break;
 532                         omode = MCAST_INCLUDE;
 533                         add = 1;
 534                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 535                         omode = MCAST_INCLUDE;
 536                         add = 0;
 537                 }
 538                 retv = ip6_mc_source(add, omode, sk, &greqs);
 539                 break;
 540         }
 541         case MCAST_MSFILTER:
 542         {
 543                 extern int sysctl_mld_max_msf;
 544                 struct group_filter *gsf;
 545
 546                 if (optlen < GROUP_FILTER_SIZE(0))
 547                         goto e_inval;
 548                 if (optlen > sysctl_optmem_max) {
 549                         retv = -ENOBUFS;
 550                         break;
 551                 }
 552                 gsf = kmalloc(optlen,GFP_KERNEL);
 553                 if (gsf == 0) {
 554                         retv = -ENOBUFS;
 555                         break;
 556                 }
 557                 retv = -EFAULT;
 558                 if (copy_from_user(gsf, optval, optlen)) {
 559                         kfree(gsf);
 560                         break;
 561                 }
 562                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 563                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 564                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 565                         kfree(gsf);
 566                         retv = -ENOBUFS;
 567                         break;
 568                 }
 569                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 570                         kfree(gsf);
 571                         retv = -EINVAL;
 572                         break;
 573                 }
 574                 retv = ip6_mc_msfilter(sk, gsf);
 575                 kfree(gsf);
 576
 577                 break;
 578         }
 579         case IPV6_ROUTER_ALERT:
 580                 retv = ip6_ra_control(sk, val, NULL);
 581                 break;
 582         case IPV6_MTU_DISCOVER:
 583                 if (val<0 || val>2)
 584                         goto e_inval;
 585                 np->pmtudisc = val;
 586                 retv = 0;
 587                 break;
 588         case IPV6_MTU:
 589                 if (val && val < IPV6_MIN_MTU)
 590                         goto e_inval;
 591                 np->frag_size = val;
 592                 retv = 0;
 593                 break;
 594         case IPV6_RECVERR:
 595                 np->recverr = valbool;
 596                 if (!val)
 597                         skb_queue_purge(&sk->sk_error_queue);
 598                 retv = 0;
 599                 break;
 600         case IPV6_FLOWINFO_SEND:
 601                 np->sndflow = valbool;
 602                 retv = 0;
 603                 break;
 604         case IPV6_FLOWLABEL_MGR:
 605                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 606                 break;
 607         case IPV6_IPSEC_POLICY:
 608         case IPV6_XFRM_POLICY:
 609                 retv = -EPERM;
 610                 if (!capable(CAP_NET_ADMIN))
 611                         break;
 612                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 613                 break;
 614
 615 #ifdef CONFIG_NETFILTER
 616         default:
 617                 retv = nf_setsockopt(sk, PF_INET6, optname, optval,
 618                                             optlen);
 619                 break;
 620 #endif
 621
 622         }
 623         release_sock(sk);
 624
 625 out:
 626         return retv;
 627
 628 e_inval:
 629         release_sock(sk);
 630         return -EINVAL;
 631 }
 632
 633 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
 634                                   char __user *optval, int len)
 635 {
 636         if (!hdr)
 637                 return 0;
 638         len = min_t(int, len, ipv6_optlen(hdr));
 639         if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
 640                 return -EFAULT;
 641         return len;
 642 }
 643
 644 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 645                     char __user *optval, int __user *optlen)
 646 {
 647         struct ipv6_pinfo *np = inet6_sk(sk);
 648         int len;
 649         int val;
 650
 651         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 652                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 653         if(level!=SOL_IPV6)
 654                 return -ENOPROTOOPT;
 655         if (get_user(len, optlen))
 656                 return -EFAULT;
 657         switch (optname) {
 658         case IPV6_ADDRFORM:
 659                 if (sk->sk_protocol != IPPROTO_UDP &&
 660                     sk->sk_protocol != IPPROTO_TCP)
 661                         return -EINVAL;
 662                 if (sk->sk_state != TCP_ESTABLISHED)
 663                         return -ENOTCONN;
 664                 val = sk->sk_family;
 665                 break;
 666         case MCAST_MSFILTER:
 667         {
 668                 struct group_filter gsf;
 669                 int err;
 670
 671                 if (len < GROUP_FILTER_SIZE(0))
 672                         return -EINVAL;
 673                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 674                         return -EFAULT;
 675                 lock_sock(sk);
 676                 err = ip6_mc_msfget(sk, &gsf,
 677                         (struct group_filter __user *)optval, optlen);
 678                 release_sock(sk);
 679                 return err;
 680         }
 681
 682         case IPV6_2292PKTOPTIONS:
 683         {
 684                 struct msghdr msg;
 685                 struct sk_buff *skb;
 686
 687                 if (sk->sk_type != SOCK_STREAM)
 688                         return -ENOPROTOOPT;
 689
 690                 msg.msg_control = optval;
 691                 msg.msg_controllen = len;
 692                 msg.msg_flags = 0;
 693
 694                 lock_sock(sk);
 695                 skb = np->pktoptions;
 696                 if (skb)
 697                         atomic_inc(&skb->users);
 698                 release_sock(sk);
 699
 700                 if (skb) {
 701                         int err = datagram_recv_ctl(sk, &msg, skb);
 702                         kfree_skb(skb);
 703                         if (err)
 704                                 return err;
 705                 } else {
 706                         if (np->rxopt.bits.rxinfo) {
 707                                 struct in6_pktinfo src_info;
 708                                 src_info.ipi6_ifindex = np->mcast_oif;
 709                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 710                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 711                         }
 712                         if (np->rxopt.bits.rxhlim) {
 713                                 int hlim = np->mcast_hops;
 714                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 715                         }
 716                         if (np->rxopt.bits.rxoinfo) {
 717                                 struct in6_pktinfo src_info;
 718                                 src_info.ipi6_ifindex = np->mcast_oif;
 719                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 720                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 721                         }
 722                         if (np->rxopt.bits.rxohlim) {
 723                                 int hlim = np->mcast_hops;
 724                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 725                         }
 726                 }
 727                 len -= msg.msg_controllen;
 728                 return put_user(len, optlen);
 729         }
 730         case IPV6_MTU:
 731         {
 732                 struct dst_entry *dst;
 733                 val = 0;
 734                 lock_sock(sk);
 735                 dst = sk_dst_get(sk);
 736                 if (dst) {
 737                         val = dst_mtu(dst);
 738                         dst_release(dst);
 739                 }
 740                 release_sock(sk);
 741                 if (!val)
 742                         return -ENOTCONN;
 743                 break;
 744         }
 745
 746         case IPV6_V6ONLY:
 747                 val = np->ipv6only;
 748                 break;
 749
 750         case IPV6_RECVPKTINFO:
 751                 val = np->rxopt.bits.rxinfo;
 752                 break;
 753
 754         case IPV6_2292PKTINFO:
 755                 val = np->rxopt.bits.rxoinfo;
 756                 break;
 757
 758         case IPV6_RECVHOPLIMIT:
 759                 val = np->rxopt.bits.rxhlim;
 760                 break;
 761
 762         case IPV6_2292HOPLIMIT:
 763                 val = np->rxopt.bits.rxohlim;
 764                 break;
 765
 766         case IPV6_RECVRTHDR:
 767                 val = np->rxopt.bits.srcrt;
 768                 break;
 769
 770         case IPV6_2292RTHDR:
 771                 val = np->rxopt.bits.osrcrt;
 772                 break;
 773
 774         case IPV6_HOPOPTS:
 775         case IPV6_RTHDRDSTOPTS:
 776         case IPV6_RTHDR:
 777         case IPV6_DSTOPTS:
 778         {
 779
 780                 lock_sock(sk);
 781                 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
 782                                              optval, len);
 783                 release_sock(sk);
 784                 return put_user(len, optlen);
 785         }
 786
 787         case IPV6_RECVHOPOPTS:
 788                 val = np->rxopt.bits.hopopts;
 789                 break;
 790
 791         case IPV6_2292HOPOPTS:
 792                 val = np->rxopt.bits.ohopopts;
 793                 break;
 794
 795         case IPV6_RECVDSTOPTS:
 796                 val = np->rxopt.bits.dstopts;
 797                 break;
 798
 799         case IPV6_2292DSTOPTS:
 800                 val = np->rxopt.bits.odstopts;
 801                 break;
 802
 803         case IPV6_TCLASS:
 804                 val = np->tclass;
 805                 break;
 806
 807         case IPV6_RECVTCLASS:
 808                 val = np->rxopt.bits.rxtclass;
 809                 break;
 810
 811         case IPV6_FLOWINFO:
 812                 val = np->rxopt.bits.rxflow;
 813                 break;
 814
 815         case IPV6_UNICAST_HOPS:
 816                 val = np->hop_limit;
 817                 break;
 818
 819         case IPV6_MULTICAST_HOPS:
 820                 val = np->mcast_hops;
 821                 break;
 822
 823         case IPV6_MULTICAST_LOOP:
 824                 val = np->mc_loop;
 825                 break;
 826
 827         case IPV6_MULTICAST_IF:
 828                 val = np->mcast_oif;
 829                 break;
 830
 831         case IPV6_MTU_DISCOVER:
 832                 val = np->pmtudisc;
 833                 break;
 834
 835         case IPV6_RECVERR:
 836                 val = np->recverr;
 837                 break;
 838
 839         case IPV6_FLOWINFO_SEND:
 840                 val = np->sndflow;
 841                 break;
 842
 843         default:
 844 #ifdef CONFIG_NETFILTER
 845                 lock_sock(sk);
 846                 val = nf_getsockopt(sk, PF_INET6, optname, optval,
 847                                     &len);
 848                 release_sock(sk);
 849                 if (val >= 0)
 850                         val = put_user(len, optlen);
 851                 return val;
 852 #else
 853                 return -EINVAL;
 854 #endif
 855         }
 856         len = min_t(unsigned int, sizeof(int), len);
 857         if(put_user(len, optlen))
 858                 return -EFAULT;
 859         if(copy_to_user(optval,&val,len))
 860                 return -EFAULT;
 861         return 0;
 862 }
 863
 864 void __init ipv6_packet_init(void)
 865 {
 866         dev_add_pack(&ipv6_packet_type);
 867 }
 868
 869 void ipv6_packet_cleanup(void)
 870 {
 871         dev_remove_pack(&ipv6_packet_type);
 872 }