git.oblomov.eu Git - linux-2.6/blob - net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  *      FIXME: Make the setsockopt code POSIX compliant: That is
  18  *
  19  *      o       Return -EINVAL for setsockopt of short lengths
  20  *      o       Truncate getsockopt returns
  21  *      o       Return an optlen of the truncated length if need be
  22  *
  23  *      Changes:
  24  *      David L Stevens <dlstevens@us.ibm.com>:
  25  *              - added multicast source filtering API for MLDv2
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/capability.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 static int do_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 (optval == NULL)
 119                 val=0;
 120         else if (get_user(val, (int __user *) optval))
 121                 return -EFAULT;
 122
 123         valbool = (val!=0);
 124
 125         lock_sock(sk);
 126
 127         switch (optname) {
 128
 129         case IPV6_ADDRFORM:
 130                 if (val == PF_INET) {
 131                         struct ipv6_txoptions *opt;
 132                         struct sk_buff *pktopt;
 133
 134                         if (sk->sk_protocol != IPPROTO_UDP &&
 135                             sk->sk_protocol != IPPROTO_TCP)
 136                                 break;
 137
 138                         if (sk->sk_state != TCP_ESTABLISHED) {
 139                                 retv = -ENOTCONN;
 140                                 break;
 141                         }
 142
 143                         if (ipv6_only_sock(sk) ||
 144                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 145                                 retv = -EADDRNOTAVAIL;
 146                                 break;
 147                         }
 148
 149                         fl6_free_socklist(sk);
 150                         ipv6_sock_mc_close(sk);
 151
 152                         /*
 153                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 154                          * remove it from the refcnt debug socks count in the
 155                          * original family...
 156                          */
 157                         sk_refcnt_debug_dec(sk);
 158
 159                         if (sk->sk_protocol == IPPROTO_TCP) {
 160                                 struct inet_connection_sock *icsk = inet_csk(sk);
 161
 162                                 local_bh_disable();
 163                                 sock_prot_dec_use(sk->sk_prot);
 164                                 sock_prot_inc_use(&tcp_prot);
 165                                 local_bh_enable();
 166                                 sk->sk_prot = &tcp_prot;
 167                                 icsk->icsk_af_ops = &ipv4_specific;
 168                                 sk->sk_socket->ops = &inet_stream_ops;
 169                                 sk->sk_family = PF_INET;
 170                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 171                         } else {
 172                                 local_bh_disable();
 173                                 sock_prot_dec_use(sk->sk_prot);
 174                                 sock_prot_inc_use(&udp_prot);
 175                                 local_bh_enable();
 176                                 sk->sk_prot = &udp_prot;
 177                                 sk->sk_socket->ops = &inet_dgram_ops;
 178                                 sk->sk_family = PF_INET;
 179                         }
 180                         opt = xchg(&np->opt, NULL);
 181                         if (opt)
 182                                 sock_kfree_s(sk, opt, opt->tot_len);
 183                         pktopt = xchg(&np->pktoptions, NULL);
 184                         if (pktopt)
 185                                 kfree_skb(pktopt);
 186
 187                         sk->sk_destruct = inet_sock_destruct;
 188                         /*
 189                          * ... and add it to the refcnt debug socks count
 190                          * in the new family. -acme
 191                          */
 192                         sk_refcnt_debug_inc(sk);
 193                         module_put(THIS_MODULE);
 194                         retv = 0;
 195                         break;
 196                 }
 197                 goto e_inval;
 198
 199         case IPV6_V6ONLY:
 200                 if (inet_sk(sk)->num)
 201                         goto e_inval;
 202                 np->ipv6only = valbool;
 203                 retv = 0;
 204                 break;
 205
 206         case IPV6_RECVPKTINFO:
 207                 np->rxopt.bits.rxinfo = valbool;
 208                 retv = 0;
 209                 break;
 210
 211         case IPV6_2292PKTINFO:
 212                 np->rxopt.bits.rxoinfo = valbool;
 213                 retv = 0;
 214                 break;
 215
 216         case IPV6_RECVHOPLIMIT:
 217                 np->rxopt.bits.rxhlim = valbool;
 218                 retv = 0;
 219                 break;
 220
 221         case IPV6_2292HOPLIMIT:
 222                 np->rxopt.bits.rxohlim = valbool;
 223                 retv = 0;
 224                 break;
 225
 226         case IPV6_RECVRTHDR:
 227                 if (val < 0 || val > 2)
 228                         goto e_inval;
 229                 np->rxopt.bits.srcrt = val;
 230                 retv = 0;
 231                 break;
 232
 233         case IPV6_2292RTHDR:
 234                 if (val < 0 || val > 2)
 235                         goto e_inval;
 236                 np->rxopt.bits.osrcrt = val;
 237                 retv = 0;
 238                 break;
 239
 240         case IPV6_RECVHOPOPTS:
 241                 np->rxopt.bits.hopopts = valbool;
 242                 retv = 0;
 243                 break;
 244
 245         case IPV6_2292HOPOPTS:
 246                 np->rxopt.bits.ohopopts = valbool;
 247                 retv = 0;
 248                 break;
 249
 250         case IPV6_RECVDSTOPTS:
 251                 np->rxopt.bits.dstopts = valbool;
 252                 retv = 0;
 253                 break;
 254
 255         case IPV6_2292DSTOPTS:
 256                 np->rxopt.bits.odstopts = valbool;
 257                 retv = 0;
 258                 break;
 259
 260         case IPV6_TCLASS:
 261                 if (val < 0 || val > 0xff)
 262                         goto e_inval;
 263                 np->tclass = val;
 264                 retv = 0;
 265                 break;
 266
 267         case IPV6_RECVTCLASS:
 268                 np->rxopt.bits.rxtclass = valbool;
 269                 retv = 0;
 270                 break;
 271
 272         case IPV6_FLOWINFO:
 273                 np->rxopt.bits.rxflow = valbool;
 274                 retv = 0;
 275                 break;
 276
 277         case IPV6_HOPOPTS:
 278         case IPV6_RTHDRDSTOPTS:
 279         case IPV6_RTHDR:
 280         case IPV6_DSTOPTS:
 281         {
 282                 struct ipv6_txoptions *opt;
 283                 if (optlen == 0)
 284                         optval = NULL;
 285
 286                 /* hop-by-hop / destination options are privileged option */
 287                 retv = -EPERM;
 288                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 289                         break;
 290
 291                 retv = -EINVAL;
 292                 if (optlen & 0x7 || optlen > 8 * 255)
 293                         break;
 294
 295                 opt = ipv6_renew_options(sk, np->opt, optname,
 296                                          (struct ipv6_opt_hdr __user *)optval,
 297                                          optlen);
 298                 if (IS_ERR(opt)) {
 299                         retv = PTR_ERR(opt);
 300                         break;
 301                 }
 302
 303                 /* routing header option needs extra check */
 304                 if (optname == IPV6_RTHDR && opt->srcrt) {
 305                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 306                         if (rthdr->type)
 307                                 goto sticky_done;
 308                         if ((rthdr->hdrlen & 1) ||
 309                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 310                                 goto sticky_done;
 311                 }
 312
 313                 retv = 0;
 314                 if (inet_sk(sk)->is_icsk) {
 315                         if (opt) {
 316                                 struct inet_connection_sock *icsk = inet_csk(sk);
 317                                 if (!((1 << sk->sk_state) &
 318                                       (TCPF_LISTEN | TCPF_CLOSE))
 319                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 320                                         icsk->icsk_ext_hdr_len =
 321                                                 opt->opt_flen + opt->opt_nflen;
 322                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 323                                 }
 324                         }
 325                         opt = xchg(&np->opt, opt);
 326                         sk_dst_reset(sk);
 327                 } else {
 328                         write_lock(&sk->sk_dst_lock);
 329                         opt = xchg(&np->opt, opt);
 330                         write_unlock(&sk->sk_dst_lock);
 331                         sk_dst_reset(sk);
 332                 }
 333 sticky_done:
 334                 if (opt)
 335                         sock_kfree_s(sk, opt, opt->tot_len);
 336                 break;
 337         }
 338
 339         case IPV6_2292PKTOPTIONS:
 340         {
 341                 struct ipv6_txoptions *opt = NULL;
 342                 struct msghdr msg;
 343                 struct flowi fl;
 344                 int junk;
 345
 346                 fl.fl6_flowlabel = 0;
 347                 fl.oif = sk->sk_bound_dev_if;
 348
 349                 if (optlen == 0)
 350                         goto update;
 351
 352                 /* 1K is probably excessive
 353                  * 1K is surely not enough, 2K per standard header is 16K.
 354                  */
 355                 retv = -EINVAL;
 356                 if (optlen > 64*1024)
 357                         break;
 358
 359                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 360                 retv = -ENOBUFS;
 361                 if (opt == NULL)
 362                         break;
 363
 364                 memset(opt, 0, sizeof(*opt));
 365                 opt->tot_len = sizeof(*opt) + optlen;
 366                 retv = -EFAULT;
 367                 if (copy_from_user(opt+1, optval, optlen))
 368                         goto done;
 369
 370                 msg.msg_controllen = optlen;
 371                 msg.msg_control = (void*)(opt+1);
 372
 373                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 374                 if (retv)
 375                         goto done;
 376 update:
 377                 retv = 0;
 378                 if (inet_sk(sk)->is_icsk) {
 379                         if (opt) {
 380                                 struct inet_connection_sock *icsk = inet_csk(sk);
 381                                 if (!((1 << sk->sk_state) &
 382                                       (TCPF_LISTEN | TCPF_CLOSE))
 383                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 384                                         icsk->icsk_ext_hdr_len =
 385                                                 opt->opt_flen + opt->opt_nflen;
 386                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 387                                 }
 388                         }
 389                         opt = xchg(&np->opt, opt);
 390                         sk_dst_reset(sk);
 391                 } else {
 392                         write_lock(&sk->sk_dst_lock);
 393                         opt = xchg(&np->opt, opt);
 394                         write_unlock(&sk->sk_dst_lock);
 395                         sk_dst_reset(sk);
 396                 }
 397
 398 done:
 399                 if (opt)
 400                         sock_kfree_s(sk, opt, opt->tot_len);
 401                 break;
 402         }
 403         case IPV6_UNICAST_HOPS:
 404                 if (val > 255 || val < -1)
 405                         goto e_inval;
 406                 np->hop_limit = val;
 407                 retv = 0;
 408                 break;
 409
 410         case IPV6_MULTICAST_HOPS:
 411                 if (sk->sk_type == SOCK_STREAM)
 412                         goto e_inval;
 413                 if (val > 255 || val < -1)
 414                         goto e_inval;
 415                 np->mcast_hops = val;
 416                 retv = 0;
 417                 break;
 418
 419         case IPV6_MULTICAST_LOOP:
 420                 np->mc_loop = valbool;
 421                 retv = 0;
 422                 break;
 423
 424         case IPV6_MULTICAST_IF:
 425                 if (sk->sk_type == SOCK_STREAM)
 426                         goto e_inval;
 427                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 428                         goto e_inval;
 429
 430                 if (__dev_get_by_index(val) == NULL) {
 431                         retv = -ENODEV;
 432                         break;
 433                 }
 434                 np->mcast_oif = val;
 435                 retv = 0;
 436                 break;
 437         case IPV6_ADD_MEMBERSHIP:
 438         case IPV6_DROP_MEMBERSHIP:
 439         {
 440                 struct ipv6_mreq mreq;
 441
 442                 retv = -EFAULT;
 443                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 444                         break;
 445
 446                 if (optname == IPV6_ADD_MEMBERSHIP)
 447                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 448                 else
 449                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 450                 break;
 451         }
 452         case IPV6_JOIN_ANYCAST:
 453         case IPV6_LEAVE_ANYCAST:
 454         {
 455                 struct ipv6_mreq mreq;
 456
 457                 if (optlen != sizeof(struct ipv6_mreq))
 458                         goto e_inval;
 459
 460                 retv = -EFAULT;
 461                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 462                         break;
 463
 464                 if (optname == IPV6_JOIN_ANYCAST)
 465                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 466                 else
 467                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 468                 break;
 469         }
 470         case MCAST_JOIN_GROUP:
 471         case MCAST_LEAVE_GROUP:
 472         {
 473                 struct group_req greq;
 474                 struct sockaddr_in6 *psin6;
 475
 476                 retv = -EFAULT;
 477                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 478                         break;
 479                 if (greq.gr_group.ss_family != AF_INET6) {
 480                         retv = -EADDRNOTAVAIL;
 481                         break;
 482                 }
 483                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 484                 if (optname == MCAST_JOIN_GROUP)
 485                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 486                                 &psin6->sin6_addr);
 487                 else
 488                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 489                                 &psin6->sin6_addr);
 490                 break;
 491         }
 492         case MCAST_JOIN_SOURCE_GROUP:
 493         case MCAST_LEAVE_SOURCE_GROUP:
 494         case MCAST_BLOCK_SOURCE:
 495         case MCAST_UNBLOCK_SOURCE:
 496         {
 497                 struct group_source_req greqs;
 498                 int omode, add;
 499
 500                 if (optlen != sizeof(struct group_source_req))
 501                         goto e_inval;
 502                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 503                         retv = -EFAULT;
 504                         break;
 505                 }
 506                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 507                     greqs.gsr_source.ss_family != AF_INET6) {
 508                         retv = -EADDRNOTAVAIL;
 509                         break;
 510                 }
 511                 if (optname == MCAST_BLOCK_SOURCE) {
 512                         omode = MCAST_EXCLUDE;
 513                         add = 1;
 514                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 515                         omode = MCAST_EXCLUDE;
 516                         add = 0;
 517                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 518                         struct sockaddr_in6 *psin6;
 519
 520                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 521                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 522                                 &psin6->sin6_addr);
 523                         /* prior join w/ different source is ok */
 524                         if (retv && retv != -EADDRINUSE)
 525                                 break;
 526                         omode = MCAST_INCLUDE;
 527                         add = 1;
 528                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 529                         omode = MCAST_INCLUDE;
 530                         add = 0;
 531                 }
 532                 retv = ip6_mc_source(add, omode, sk, &greqs);
 533                 break;
 534         }
 535         case MCAST_MSFILTER:
 536         {
 537                 extern int sysctl_mld_max_msf;
 538                 struct group_filter *gsf;
 539
 540                 if (optlen < GROUP_FILTER_SIZE(0))
 541                         goto e_inval;
 542                 if (optlen > sysctl_optmem_max) {
 543                         retv = -ENOBUFS;
 544                         break;
 545                 }
 546                 gsf = kmalloc(optlen,GFP_KERNEL);
 547                 if (gsf == 0) {
 548                         retv = -ENOBUFS;
 549                         break;
 550                 }
 551                 retv = -EFAULT;
 552                 if (copy_from_user(gsf, optval, optlen)) {
 553                         kfree(gsf);
 554                         break;
 555                 }
 556                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 557                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 558                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 559                         kfree(gsf);
 560                         retv = -ENOBUFS;
 561                         break;
 562                 }
 563                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 564                         kfree(gsf);
 565                         retv = -EINVAL;
 566                         break;
 567                 }
 568                 retv = ip6_mc_msfilter(sk, gsf);
 569                 kfree(gsf);
 570
 571                 break;
 572         }
 573         case IPV6_ROUTER_ALERT:
 574                 retv = ip6_ra_control(sk, val, NULL);
 575                 break;
 576         case IPV6_MTU_DISCOVER:
 577                 if (val<0 || val>2)
 578                         goto e_inval;
 579                 np->pmtudisc = val;
 580                 retv = 0;
 581                 break;
 582         case IPV6_MTU:
 583                 if (val && val < IPV6_MIN_MTU)
 584                         goto e_inval;
 585                 np->frag_size = val;
 586                 retv = 0;
 587                 break;
 588         case IPV6_RECVERR:
 589                 np->recverr = valbool;
 590                 if (!val)
 591                         skb_queue_purge(&sk->sk_error_queue);
 592                 retv = 0;
 593                 break;
 594         case IPV6_FLOWINFO_SEND:
 595                 np->sndflow = valbool;
 596                 retv = 0;
 597                 break;
 598         case IPV6_FLOWLABEL_MGR:
 599                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 600                 break;
 601         case IPV6_IPSEC_POLICY:
 602         case IPV6_XFRM_POLICY:
 603                 retv = -EPERM;
 604                 if (!capable(CAP_NET_ADMIN))
 605                         break;
 606                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 607                 break;
 608
 609         }
 610         release_sock(sk);
 611
 612         return retv;
 613
 614 e_inval:
 615         release_sock(sk);
 616         return -EINVAL;
 617 }
 618
 619 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 620                     char __user *optval, int optlen)
 621 {
 622         int err;
 623
 624         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 625                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 626
 627         if (level != SOL_IPV6)
 628                 return -ENOPROTOOPT;
 629
 630         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 631 #ifdef CONFIG_NETFILTER
 632         /* we need to exclude all possible ENOPROTOOPTs except default case */
 633         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 634                         optname != IPV6_XFRM_POLICY) {
 635                 lock_sock(sk);
 636                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 637                                 optlen);
 638                 release_sock(sk);
 639         }
 640 #endif
 641         return err;
 642 }
 643
 644
 645 #ifdef CONFIG_COMPAT
 646 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 647                            char __user *optval, int optlen)
 648 {
 649         int err;
 650
 651         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 652                 if (udp_prot.compat_setsockopt != NULL)
 653                         return udp_prot.compat_setsockopt(sk, level, optname,
 654                                                           optval, optlen);
 655                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 656         }
 657
 658         if (level != SOL_IPV6)
 659                 return -ENOPROTOOPT;
 660
 661         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 662 #ifdef CONFIG_NETFILTER
 663         /* we need to exclude all possible ENOPROTOOPTs except default case */
 664         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 665             optname != IPV6_XFRM_POLICY) {
 666                 lock_sock(sk);
 667                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 668                                            optval, optlen);
 669                 release_sock(sk);
 670         }
 671 #endif
 672         return err;
 673 }
 674
 675 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 676 #endif
 677
 678 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
 679                                   char __user *optval, int len)
 680 {
 681         if (!hdr)
 682                 return 0;
 683         len = min_t(int, len, ipv6_optlen(hdr));
 684         if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
 685                 return -EFAULT;
 686         return len;
 687 }
 688
 689 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 690                     char __user *optval, int __user *optlen)
 691 {
 692         struct ipv6_pinfo *np = inet6_sk(sk);
 693         int len;
 694         int val;
 695
 696         if (get_user(len, optlen))
 697                 return -EFAULT;
 698         switch (optname) {
 699         case IPV6_ADDRFORM:
 700                 if (sk->sk_protocol != IPPROTO_UDP &&
 701                     sk->sk_protocol != IPPROTO_TCP)
 702                         return -EINVAL;
 703                 if (sk->sk_state != TCP_ESTABLISHED)
 704                         return -ENOTCONN;
 705                 val = sk->sk_family;
 706                 break;
 707         case MCAST_MSFILTER:
 708         {
 709                 struct group_filter gsf;
 710                 int err;
 711
 712                 if (len < GROUP_FILTER_SIZE(0))
 713                         return -EINVAL;
 714                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 715                         return -EFAULT;
 716                 lock_sock(sk);
 717                 err = ip6_mc_msfget(sk, &gsf,
 718                         (struct group_filter __user *)optval, optlen);
 719                 release_sock(sk);
 720                 return err;
 721         }
 722
 723         case IPV6_2292PKTOPTIONS:
 724         {
 725                 struct msghdr msg;
 726                 struct sk_buff *skb;
 727
 728                 if (sk->sk_type != SOCK_STREAM)
 729                         return -ENOPROTOOPT;
 730
 731                 msg.msg_control = optval;
 732                 msg.msg_controllen = len;
 733                 msg.msg_flags = 0;
 734
 735                 lock_sock(sk);
 736                 skb = np->pktoptions;
 737                 if (skb)
 738                         atomic_inc(&skb->users);
 739                 release_sock(sk);
 740
 741                 if (skb) {
 742                         int err = datagram_recv_ctl(sk, &msg, skb);
 743                         kfree_skb(skb);
 744                         if (err)
 745                                 return err;
 746                 } else {
 747                         if (np->rxopt.bits.rxinfo) {
 748                                 struct in6_pktinfo src_info;
 749                                 src_info.ipi6_ifindex = np->mcast_oif;
 750                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 751                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 752                         }
 753                         if (np->rxopt.bits.rxhlim) {
 754                                 int hlim = np->mcast_hops;
 755                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 756                         }
 757                         if (np->rxopt.bits.rxoinfo) {
 758                                 struct in6_pktinfo src_info;
 759                                 src_info.ipi6_ifindex = np->mcast_oif;
 760                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 761                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 762                         }
 763                         if (np->rxopt.bits.rxohlim) {
 764                                 int hlim = np->mcast_hops;
 765                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 766                         }
 767                 }
 768                 len -= msg.msg_controllen;
 769                 return put_user(len, optlen);
 770         }
 771         case IPV6_MTU:
 772         {
 773                 struct dst_entry *dst;
 774                 val = 0;
 775                 lock_sock(sk);
 776                 dst = sk_dst_get(sk);
 777                 if (dst) {
 778                         val = dst_mtu(dst);
 779                         dst_release(dst);
 780                 }
 781                 release_sock(sk);
 782                 if (!val)
 783                         return -ENOTCONN;
 784                 break;
 785         }
 786
 787         case IPV6_V6ONLY:
 788                 val = np->ipv6only;
 789                 break;
 790
 791         case IPV6_RECVPKTINFO:
 792                 val = np->rxopt.bits.rxinfo;
 793                 break;
 794
 795         case IPV6_2292PKTINFO:
 796                 val = np->rxopt.bits.rxoinfo;
 797                 break;
 798
 799         case IPV6_RECVHOPLIMIT:
 800                 val = np->rxopt.bits.rxhlim;
 801                 break;
 802
 803         case IPV6_2292HOPLIMIT:
 804                 val = np->rxopt.bits.rxohlim;
 805                 break;
 806
 807         case IPV6_RECVRTHDR:
 808                 val = np->rxopt.bits.srcrt;
 809                 break;
 810
 811         case IPV6_2292RTHDR:
 812                 val = np->rxopt.bits.osrcrt;
 813                 break;
 814
 815         case IPV6_HOPOPTS:
 816         case IPV6_RTHDRDSTOPTS:
 817         case IPV6_RTHDR:
 818         case IPV6_DSTOPTS:
 819         {
 820
 821                 lock_sock(sk);
 822                 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
 823                                              optval, len);
 824                 release_sock(sk);
 825                 return put_user(len, optlen);
 826         }
 827
 828         case IPV6_RECVHOPOPTS:
 829                 val = np->rxopt.bits.hopopts;
 830                 break;
 831
 832         case IPV6_2292HOPOPTS:
 833                 val = np->rxopt.bits.ohopopts;
 834                 break;
 835
 836         case IPV6_RECVDSTOPTS:
 837                 val = np->rxopt.bits.dstopts;
 838                 break;
 839
 840         case IPV6_2292DSTOPTS:
 841                 val = np->rxopt.bits.odstopts;
 842                 break;
 843
 844         case IPV6_TCLASS:
 845                 val = np->tclass;
 846                 break;
 847
 848         case IPV6_RECVTCLASS:
 849                 val = np->rxopt.bits.rxtclass;
 850                 break;
 851
 852         case IPV6_FLOWINFO:
 853                 val = np->rxopt.bits.rxflow;
 854                 break;
 855
 856         case IPV6_UNICAST_HOPS:
 857                 val = np->hop_limit;
 858                 break;
 859
 860         case IPV6_MULTICAST_HOPS:
 861                 val = np->mcast_hops;
 862                 break;
 863
 864         case IPV6_MULTICAST_LOOP:
 865                 val = np->mc_loop;
 866                 break;
 867
 868         case IPV6_MULTICAST_IF:
 869                 val = np->mcast_oif;
 870                 break;
 871
 872         case IPV6_MTU_DISCOVER:
 873                 val = np->pmtudisc;
 874                 break;
 875
 876         case IPV6_RECVERR:
 877                 val = np->recverr;
 878                 break;
 879
 880         case IPV6_FLOWINFO_SEND:
 881                 val = np->sndflow;
 882                 break;
 883
 884         default:
 885                 return -EINVAL;
 886         }
 887         len = min_t(unsigned int, sizeof(int), len);
 888         if(put_user(len, optlen))
 889                 return -EFAULT;
 890         if(copy_to_user(optval,&val,len))
 891                 return -EFAULT;
 892         return 0;
 893 }
 894
 895 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 896                     char __user *optval, int __user *optlen)
 897 {
 898         int err;
 899
 900         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 901                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 902
 903         if(level != SOL_IPV6)
 904                 return -ENOPROTOOPT;
 905
 906         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
 907 #ifdef CONFIG_NETFILTER
 908         /* we need to exclude all possible EINVALs except default case */
 909         if (err == -EINVAL && optname != IPV6_ADDRFORM &&
 910                         optname != MCAST_MSFILTER) {
 911                 int len;
 912
 913                 if (get_user(len, optlen))
 914                         return -EFAULT;
 915
 916                 lock_sock(sk);
 917                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
 918                                 &len);
 919                 release_sock(sk);
 920                 if (err >= 0)
 921                         err = put_user(len, optlen);
 922         }
 923 #endif
 924         return err;
 925 }
 926
 927 #ifdef CONFIG_COMPAT
 928 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
 929                            char __user *optval, int __user *optlen)
 930 {
 931         int err;
 932
 933         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 934                 if (udp_prot.compat_getsockopt != NULL)
 935                         return udp_prot.compat_getsockopt(sk, level, optname,
 936                                                           optval, optlen);
 937                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 938         }
 939
 940         if (level != SOL_IPV6)
 941                 return -ENOPROTOOPT;
 942
 943         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
 944 #ifdef CONFIG_NETFILTER
 945         /* we need to exclude all possible EINVALs except default case */
 946         if (err == -EINVAL && optname != IPV6_ADDRFORM &&
 947                         optname != MCAST_MSFILTER) {
 948                 int len;
 949
 950                 if (get_user(len, optlen))
 951                         return -EFAULT;
 952
 953                 lock_sock(sk);
 954                 err = compat_nf_getsockopt(sk, PF_INET6,
 955                                            optname, optval, &len);
 956                 release_sock(sk);
 957                 if (err >= 0)
 958                         err = put_user(len, optlen);
 959         }
 960 #endif
 961         return err;
 962 }
 963
 964 EXPORT_SYMBOL(compat_ipv6_getsockopt);
 965 #endif
 966
 967 void __init ipv6_packet_init(void)
 968 {
 969         dev_add_pack(&ipv6_packet_type);
 970 }
 971
 972 void ipv6_packet_cleanup(void)
 973 {
 974         dev_remove_pack(&ipv6_packet_type);
 975 }