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/config.h>
  31 #include <linux/errno.h>
  32 #include <linux/types.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/sched.h>
  36 #include <linux/net.h>
  37 #include <linux/in6.h>
  38 #include <linux/netdevice.h>
  39 #include <linux/if_arp.h>
  40 #include <linux/init.h>
  41 #include <linux/sysctl.h>
  42 #include <linux/netfilter.h>
  43
  44 #include <net/sock.h>
  45 #include <net/snmp.h>
  46 #include <net/ipv6.h>
  47 #include <net/ndisc.h>
  48 #include <net/protocol.h>
  49 #include <net/transp_v6.h>
  50 #include <net/ip6_route.h>
  51 #include <net/addrconf.h>
  52 #include <net/inet_common.h>
  53 #include <net/tcp.h>
  54 #include <net/udp.h>
  55 #include <net/xfrm.h>
  56
  57 #include <asm/uaccess.h>
  58
  59 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  60
  61 static struct packet_type ipv6_packet_type = {
  62         .type = __constant_htons(ETH_P_IPV6),
  63         .func = ipv6_rcv,
  64 };
  65
  66 struct ip6_ra_chain *ip6_ra_chain;
  67 DEFINE_RWLOCK(ip6_ra_lock);
  68
  69 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
  70 {
  71         struct ip6_ra_chain *ra, *new_ra, **rap;
  72
  73         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  74         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
  75                 return -EINVAL;
  76
  77         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  78
  79         write_lock_bh(&ip6_ra_lock);
  80         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  81                 if (ra->sk == sk) {
  82                         if (sel>=0) {
  83                                 write_unlock_bh(&ip6_ra_lock);
  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 static int do_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 (optval == NULL)
 120                 val=0;
 121         else if (get_user(val, (int __user *) optval))
 122                 return -EFAULT;
 123
 124         valbool = (val!=0);
 125
 126         lock_sock(sk);
 127
 128         switch (optname) {
 129
 130         case IPV6_ADDRFORM:
 131                 if (val == PF_INET) {
 132                         struct ipv6_txoptions *opt;
 133                         struct sk_buff *pktopt;
 134
 135                         if (sk->sk_protocol != IPPROTO_UDP &&
 136                             sk->sk_protocol != IPPROTO_TCP)
 137                                 break;
 138
 139                         if (sk->sk_state != TCP_ESTABLISHED) {
 140                                 retv = -ENOTCONN;
 141                                 break;
 142                         }
 143
 144                         if (ipv6_only_sock(sk) ||
 145                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 146                                 retv = -EADDRNOTAVAIL;
 147                                 break;
 148                         }
 149
 150                         fl6_free_socklist(sk);
 151                         ipv6_sock_mc_close(sk);
 152
 153                         /*
 154                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 155                          * remove it from the refcnt debug socks count in the
 156                          * original family...
 157                          */
 158                         sk_refcnt_debug_dec(sk);
 159
 160                         if (sk->sk_protocol == IPPROTO_TCP) {
 161                                 struct inet_connection_sock *icsk = inet_csk(sk);
 162
 163                                 local_bh_disable();
 164                                 sock_prot_dec_use(sk->sk_prot);
 165                                 sock_prot_inc_use(&tcp_prot);
 166                                 local_bh_enable();
 167                                 sk->sk_prot = &tcp_prot;
 168                                 icsk->icsk_af_ops = &ipv4_specific;
 169                                 sk->sk_socket->ops = &inet_stream_ops;
 170                                 sk->sk_family = PF_INET;
 171                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 172                         } else {
 173                                 local_bh_disable();
 174                                 sock_prot_dec_use(sk->sk_prot);
 175                                 sock_prot_inc_use(&udp_prot);
 176                                 local_bh_enable();
 177                                 sk->sk_prot = &udp_prot;
 178                                 sk->sk_socket->ops = &inet_dgram_ops;
 179                                 sk->sk_family = PF_INET;
 180                         }
 181                         opt = xchg(&np->opt, NULL);
 182                         if (opt)
 183                                 sock_kfree_s(sk, opt, opt->tot_len);
 184                         pktopt = xchg(&np->pktoptions, NULL);
 185                         if (pktopt)
 186                                 kfree_skb(pktopt);
 187
 188                         sk->sk_destruct = inet_sock_destruct;
 189                         /*
 190                          * ... and add it to the refcnt debug socks count
 191                          * in the new family. -acme
 192                          */
 193                         sk_refcnt_debug_inc(sk);
 194                         module_put(THIS_MODULE);
 195                         retv = 0;
 196                         break;
 197                 }
 198                 goto e_inval;
 199
 200         case IPV6_V6ONLY:
 201                 if (inet_sk(sk)->num)
 202                         goto e_inval;
 203                 np->ipv6only = valbool;
 204                 retv = 0;
 205                 break;
 206
 207         case IPV6_RECVPKTINFO:
 208                 np->rxopt.bits.rxinfo = valbool;
 209                 retv = 0;
 210                 break;
 211
 212         case IPV6_2292PKTINFO:
 213                 np->rxopt.bits.rxoinfo = valbool;
 214                 retv = 0;
 215                 break;
 216
 217         case IPV6_RECVHOPLIMIT:
 218                 np->rxopt.bits.rxhlim = valbool;
 219                 retv = 0;
 220                 break;
 221
 222         case IPV6_2292HOPLIMIT:
 223                 np->rxopt.bits.rxohlim = valbool;
 224                 retv = 0;
 225                 break;
 226
 227         case IPV6_RECVRTHDR:
 228                 if (val < 0 || val > 2)
 229                         goto e_inval;
 230                 np->rxopt.bits.srcrt = val;
 231                 retv = 0;
 232                 break;
 233
 234         case IPV6_2292RTHDR:
 235                 if (val < 0 || val > 2)
 236                         goto e_inval;
 237                 np->rxopt.bits.osrcrt = val;
 238                 retv = 0;
 239                 break;
 240
 241         case IPV6_RECVHOPOPTS:
 242                 np->rxopt.bits.hopopts = valbool;
 243                 retv = 0;
 244                 break;
 245
 246         case IPV6_2292HOPOPTS:
 247                 np->rxopt.bits.ohopopts = valbool;
 248                 retv = 0;
 249                 break;
 250
 251         case IPV6_RECVDSTOPTS:
 252                 np->rxopt.bits.dstopts = valbool;
 253                 retv = 0;
 254                 break;
 255
 256         case IPV6_2292DSTOPTS:
 257                 np->rxopt.bits.odstopts = valbool;
 258                 retv = 0;
 259                 break;
 260
 261         case IPV6_TCLASS:
 262                 if (val < 0 || val > 0xff)
 263                         goto e_inval;
 264                 np->tclass = val;
 265                 retv = 0;
 266                 break;
 267
 268         case IPV6_RECVTCLASS:
 269                 np->rxopt.bits.rxtclass = valbool;
 270                 retv = 0;
 271                 break;
 272
 273         case IPV6_FLOWINFO:
 274                 np->rxopt.bits.rxflow = valbool;
 275                 retv = 0;
 276                 break;
 277
 278         case IPV6_HOPOPTS:
 279         case IPV6_RTHDRDSTOPTS:
 280         case IPV6_RTHDR:
 281         case IPV6_DSTOPTS:
 282         {
 283                 struct ipv6_txoptions *opt;
 284                 if (optlen == 0)
 285                         optval = NULL;
 286
 287                 /* hop-by-hop / destination options are privileged option */
 288                 retv = -EPERM;
 289                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 290                         break;
 291
 292                 retv = -EINVAL;
 293                 if (optlen & 0x7 || optlen > 8 * 255)
 294                         break;
 295
 296                 opt = ipv6_renew_options(sk, np->opt, optname,
 297                                          (struct ipv6_opt_hdr __user *)optval,
 298                                          optlen);
 299                 if (IS_ERR(opt)) {
 300                         retv = PTR_ERR(opt);
 301                         break;
 302                 }
 303
 304                 /* routing header option needs extra check */
 305                 if (optname == IPV6_RTHDR && opt->srcrt) {
 306                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 307                         if (rthdr->type)
 308                                 goto sticky_done;
 309                         if ((rthdr->hdrlen & 1) ||
 310                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 311                                 goto sticky_done;
 312                 }
 313
 314                 retv = 0;
 315                 if (inet_sk(sk)->is_icsk) {
 316                         if (opt) {
 317                                 struct inet_connection_sock *icsk = inet_csk(sk);
 318                                 if (!((1 << sk->sk_state) &
 319                                       (TCPF_LISTEN | TCPF_CLOSE))
 320                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 321                                         icsk->icsk_ext_hdr_len =
 322                                                 opt->opt_flen + opt->opt_nflen;
 323                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 324                                 }
 325                         }
 326                         opt = xchg(&np->opt, opt);
 327                         sk_dst_reset(sk);
 328                 } else {
 329                         write_lock(&sk->sk_dst_lock);
 330                         opt = xchg(&np->opt, opt);
 331                         write_unlock(&sk->sk_dst_lock);
 332                         sk_dst_reset(sk);
 333                 }
 334 sticky_done:
 335                 if (opt)
 336                         sock_kfree_s(sk, opt, opt->tot_len);
 337                 break;
 338         }
 339
 340         case IPV6_2292PKTOPTIONS:
 341         {
 342                 struct ipv6_txoptions *opt = NULL;
 343                 struct msghdr msg;
 344                 struct flowi fl;
 345                 int junk;
 346
 347                 fl.fl6_flowlabel = 0;
 348                 fl.oif = sk->sk_bound_dev_if;
 349
 350                 if (optlen == 0)
 351                         goto update;
 352
 353                 /* 1K is probably excessive
 354                  * 1K is surely not enough, 2K per standard header is 16K.
 355                  */
 356                 retv = -EINVAL;
 357                 if (optlen > 64*1024)
 358                         break;
 359
 360                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 361                 retv = -ENOBUFS;
 362                 if (opt == NULL)
 363                         break;
 364
 365                 memset(opt, 0, sizeof(*opt));
 366                 opt->tot_len = sizeof(*opt) + optlen;
 367                 retv = -EFAULT;
 368                 if (copy_from_user(opt+1, optval, optlen))
 369                         goto done;
 370
 371                 msg.msg_controllen = optlen;
 372                 msg.msg_control = (void*)(opt+1);
 373
 374                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 375                 if (retv)
 376                         goto done;
 377 update:
 378                 retv = 0;
 379                 if (inet_sk(sk)->is_icsk) {
 380                         if (opt) {
 381                                 struct inet_connection_sock *icsk = inet_csk(sk);
 382                                 if (!((1 << sk->sk_state) &
 383                                       (TCPF_LISTEN | TCPF_CLOSE))
 384                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 385                                         icsk->icsk_ext_hdr_len =
 386                                                 opt->opt_flen + opt->opt_nflen;
 387                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 388                                 }
 389                         }
 390                         opt = xchg(&np->opt, opt);
 391                         sk_dst_reset(sk);
 392                 } else {
 393                         write_lock(&sk->sk_dst_lock);
 394                         opt = xchg(&np->opt, opt);
 395                         write_unlock(&sk->sk_dst_lock);
 396                         sk_dst_reset(sk);
 397                 }
 398
 399 done:
 400                 if (opt)
 401                         sock_kfree_s(sk, opt, opt->tot_len);
 402                 break;
 403         }
 404         case IPV6_UNICAST_HOPS:
 405                 if (val > 255 || val < -1)
 406                         goto e_inval;
 407                 np->hop_limit = val;
 408                 retv = 0;
 409                 break;
 410
 411         case IPV6_MULTICAST_HOPS:
 412                 if (sk->sk_type == SOCK_STREAM)
 413                         goto e_inval;
 414                 if (val > 255 || val < -1)
 415                         goto e_inval;
 416                 np->mcast_hops = val;
 417                 retv = 0;
 418                 break;
 419
 420         case IPV6_MULTICAST_LOOP:
 421                 np->mc_loop = valbool;
 422                 retv = 0;
 423                 break;
 424
 425         case IPV6_MULTICAST_IF:
 426                 if (sk->sk_type == SOCK_STREAM)
 427                         goto e_inval;
 428                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 429                         goto e_inval;
 430
 431                 if (__dev_get_by_index(val) == NULL) {
 432                         retv = -ENODEV;
 433                         break;
 434                 }
 435                 np->mcast_oif = val;
 436                 retv = 0;
 437                 break;
 438         case IPV6_ADD_MEMBERSHIP:
 439         case IPV6_DROP_MEMBERSHIP:
 440         {
 441                 struct ipv6_mreq mreq;
 442
 443                 retv = -EFAULT;
 444                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 445                         break;
 446
 447                 if (optname == IPV6_ADD_MEMBERSHIP)
 448                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 449                 else
 450                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 451                 break;
 452         }
 453         case IPV6_JOIN_ANYCAST:
 454         case IPV6_LEAVE_ANYCAST:
 455         {
 456                 struct ipv6_mreq mreq;
 457
 458                 if (optlen != sizeof(struct ipv6_mreq))
 459                         goto e_inval;
 460
 461                 retv = -EFAULT;
 462                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 463                         break;
 464
 465                 if (optname == IPV6_JOIN_ANYCAST)
 466                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 467                 else
 468                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 469                 break;
 470         }
 471         case MCAST_JOIN_GROUP:
 472         case MCAST_LEAVE_GROUP:
 473         {
 474                 struct group_req greq;
 475                 struct sockaddr_in6 *psin6;
 476
 477                 retv = -EFAULT;
 478                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 479                         break;
 480                 if (greq.gr_group.ss_family != AF_INET6) {
 481                         retv = -EADDRNOTAVAIL;
 482                         break;
 483                 }
 484                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 485                 if (optname == MCAST_JOIN_GROUP)
 486                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 487                                 &psin6->sin6_addr);
 488                 else
 489                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 490                                 &psin6->sin6_addr);
 491                 break;
 492         }
 493         case MCAST_JOIN_SOURCE_GROUP:
 494         case MCAST_LEAVE_SOURCE_GROUP:
 495         case MCAST_BLOCK_SOURCE:
 496         case MCAST_UNBLOCK_SOURCE:
 497         {
 498                 struct group_source_req greqs;
 499                 int omode, add;
 500
 501                 if (optlen != sizeof(struct group_source_req))
 502                         goto e_inval;
 503                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 504                         retv = -EFAULT;
 505                         break;
 506                 }
 507                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 508                     greqs.gsr_source.ss_family != AF_INET6) {
 509                         retv = -EADDRNOTAVAIL;
 510                         break;
 511                 }
 512                 if (optname == MCAST_BLOCK_SOURCE) {
 513                         omode = MCAST_EXCLUDE;
 514                         add = 1;
 515                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 516                         omode = MCAST_EXCLUDE;
 517                         add = 0;
 518                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 519                         struct sockaddr_in6 *psin6;
 520
 521                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 522                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 523                                 &psin6->sin6_addr);
 524                         /* prior join w/ different source is ok */
 525                         if (retv && retv != -EADDRINUSE)
 526                                 break;
 527                         omode = MCAST_INCLUDE;
 528                         add = 1;
 529                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 530                         omode = MCAST_INCLUDE;
 531                         add = 0;
 532                 }
 533                 retv = ip6_mc_source(add, omode, sk, &greqs);
 534                 break;
 535         }
 536         case MCAST_MSFILTER:
 537         {
 538                 extern int sysctl_mld_max_msf;
 539                 struct group_filter *gsf;
 540
 541                 if (optlen < GROUP_FILTER_SIZE(0))
 542                         goto e_inval;
 543                 if (optlen > sysctl_optmem_max) {
 544                         retv = -ENOBUFS;
 545                         break;
 546                 }
 547                 gsf = kmalloc(optlen,GFP_KERNEL);
 548                 if (gsf == 0) {
 549                         retv = -ENOBUFS;
 550                         break;
 551                 }
 552                 retv = -EFAULT;
 553                 if (copy_from_user(gsf, optval, optlen)) {
 554                         kfree(gsf);
 555                         break;
 556                 }
 557                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 558                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 559                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 560                         kfree(gsf);
 561                         retv = -ENOBUFS;
 562                         break;
 563                 }
 564                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 565                         kfree(gsf);
 566                         retv = -EINVAL;
 567                         break;
 568                 }
 569                 retv = ip6_mc_msfilter(sk, gsf);
 570                 kfree(gsf);
 571
 572                 break;
 573         }
 574         case IPV6_ROUTER_ALERT:
 575                 retv = ip6_ra_control(sk, val, NULL);
 576                 break;
 577         case IPV6_MTU_DISCOVER:
 578                 if (val<0 || val>2)
 579                         goto e_inval;
 580                 np->pmtudisc = val;
 581                 retv = 0;
 582                 break;
 583         case IPV6_MTU:
 584                 if (val && val < IPV6_MIN_MTU)
 585                         goto e_inval;
 586                 np->frag_size = val;
 587                 retv = 0;
 588                 break;
 589         case IPV6_RECVERR:
 590                 np->recverr = valbool;
 591                 if (!val)
 592                         skb_queue_purge(&sk->sk_error_queue);
 593                 retv = 0;
 594                 break;
 595         case IPV6_FLOWINFO_SEND:
 596                 np->sndflow = valbool;
 597                 retv = 0;
 598                 break;
 599         case IPV6_FLOWLABEL_MGR:
 600                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 601                 break;
 602         case IPV6_IPSEC_POLICY:
 603         case IPV6_XFRM_POLICY:
 604                 retv = -EPERM;
 605                 if (!capable(CAP_NET_ADMIN))
 606                         break;
 607                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 608                 break;
 609
 610         }
 611         release_sock(sk);
 612
 613         return retv;
 614
 615 e_inval:
 616         release_sock(sk);
 617         return -EINVAL;
 618 }
 619
 620 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 621                     char __user *optval, int optlen)
 622 {
 623         int err;
 624
 625         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 626                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 627
 628         if (level != SOL_IPV6)
 629                 return -ENOPROTOOPT;
 630
 631         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 632 #ifdef CONFIG_NETFILTER
 633         /* we need to exclude all possible ENOPROTOOPTs except default case */
 634         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 635                         optname != IPV6_XFRM_POLICY) {
 636                 lock_sock(sk);
 637                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 638                                 optlen);
 639                 release_sock(sk);
 640         }
 641 #endif
 642         return err;
 643 }
 644
 645
 646 #ifdef CONFIG_COMPAT
 647 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 648                            char __user *optval, int optlen)
 649 {
 650         int err;
 651
 652         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 653                 if (udp_prot.compat_setsockopt != NULL)
 654                         return udp_prot.compat_setsockopt(sk, level, optname,
 655                                                           optval, optlen);
 656                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 657         }
 658
 659         if (level != SOL_IPV6)
 660                 return -ENOPROTOOPT;
 661
 662         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 663 #ifdef CONFIG_NETFILTER
 664         /* we need to exclude all possible ENOPROTOOPTs except default case */
 665         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 666             optname != IPV6_XFRM_POLICY) {
 667                 lock_sock(sk);
 668                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 669                                            optval, optlen);
 670                 release_sock(sk);
 671         }
 672 #endif
 673         return err;
 674 }
 675
 676 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 677 #endif
 678
 679 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
 680                                   char __user *optval, int len)
 681 {
 682         if (!hdr)
 683                 return 0;
 684         len = min_t(int, len, ipv6_optlen(hdr));
 685         if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
 686                 return -EFAULT;
 687         return len;
 688 }
 689
 690 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 691                     char __user *optval, int __user *optlen)
 692 {
 693         struct ipv6_pinfo *np = inet6_sk(sk);
 694         int len;
 695         int val;
 696
 697         if (get_user(len, optlen))
 698                 return -EFAULT;
 699         switch (optname) {
 700         case IPV6_ADDRFORM:
 701                 if (sk->sk_protocol != IPPROTO_UDP &&
 702                     sk->sk_protocol != IPPROTO_TCP)
 703                         return -EINVAL;
 704                 if (sk->sk_state != TCP_ESTABLISHED)
 705                         return -ENOTCONN;
 706                 val = sk->sk_family;
 707                 break;
 708         case MCAST_MSFILTER:
 709         {
 710                 struct group_filter gsf;
 711                 int err;
 712
 713                 if (len < GROUP_FILTER_SIZE(0))
 714                         return -EINVAL;
 715                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 716                         return -EFAULT;
 717                 lock_sock(sk);
 718                 err = ip6_mc_msfget(sk, &gsf,
 719                         (struct group_filter __user *)optval, optlen);
 720                 release_sock(sk);
 721                 return err;
 722         }
 723
 724         case IPV6_2292PKTOPTIONS:
 725         {
 726                 struct msghdr msg;
 727                 struct sk_buff *skb;
 728
 729                 if (sk->sk_type != SOCK_STREAM)
 730                         return -ENOPROTOOPT;
 731
 732                 msg.msg_control = optval;
 733                 msg.msg_controllen = len;
 734                 msg.msg_flags = 0;
 735
 736                 lock_sock(sk);
 737                 skb = np->pktoptions;
 738                 if (skb)
 739                         atomic_inc(&skb->users);
 740                 release_sock(sk);
 741
 742                 if (skb) {
 743                         int err = datagram_recv_ctl(sk, &msg, skb);
 744                         kfree_skb(skb);
 745                         if (err)
 746                                 return err;
 747                 } else {
 748                         if (np->rxopt.bits.rxinfo) {
 749                                 struct in6_pktinfo src_info;
 750                                 src_info.ipi6_ifindex = np->mcast_oif;
 751                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 752                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 753                         }
 754                         if (np->rxopt.bits.rxhlim) {
 755                                 int hlim = np->mcast_hops;
 756                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 757                         }
 758                         if (np->rxopt.bits.rxoinfo) {
 759                                 struct in6_pktinfo src_info;
 760                                 src_info.ipi6_ifindex = np->mcast_oif;
 761                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 762                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 763                         }
 764                         if (np->rxopt.bits.rxohlim) {
 765                                 int hlim = np->mcast_hops;
 766                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 767                         }
 768                 }
 769                 len -= msg.msg_controllen;
 770                 return put_user(len, optlen);
 771         }
 772         case IPV6_MTU:
 773         {
 774                 struct dst_entry *dst;
 775                 val = 0;
 776                 lock_sock(sk);
 777                 dst = sk_dst_get(sk);
 778                 if (dst) {
 779                         val = dst_mtu(dst);
 780                         dst_release(dst);
 781                 }
 782                 release_sock(sk);
 783                 if (!val)
 784                         return -ENOTCONN;
 785                 break;
 786         }
 787
 788         case IPV6_V6ONLY:
 789                 val = np->ipv6only;
 790                 break;
 791
 792         case IPV6_RECVPKTINFO:
 793                 val = np->rxopt.bits.rxinfo;
 794                 break;
 795
 796         case IPV6_2292PKTINFO:
 797                 val = np->rxopt.bits.rxoinfo;
 798                 break;
 799
 800         case IPV6_RECVHOPLIMIT:
 801                 val = np->rxopt.bits.rxhlim;
 802                 break;
 803
 804         case IPV6_2292HOPLIMIT:
 805                 val = np->rxopt.bits.rxohlim;
 806                 break;
 807
 808         case IPV6_RECVRTHDR:
 809                 val = np->rxopt.bits.srcrt;
 810                 break;
 811
 812         case IPV6_2292RTHDR:
 813                 val = np->rxopt.bits.osrcrt;
 814                 break;
 815
 816         case IPV6_HOPOPTS:
 817         case IPV6_RTHDRDSTOPTS:
 818         case IPV6_RTHDR:
 819         case IPV6_DSTOPTS:
 820         {
 821
 822                 lock_sock(sk);
 823                 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
 824                                              optval, len);
 825                 release_sock(sk);
 826                 return put_user(len, optlen);
 827         }
 828
 829         case IPV6_RECVHOPOPTS:
 830                 val = np->rxopt.bits.hopopts;
 831                 break;
 832
 833         case IPV6_2292HOPOPTS:
 834                 val = np->rxopt.bits.ohopopts;
 835                 break;
 836
 837         case IPV6_RECVDSTOPTS:
 838                 val = np->rxopt.bits.dstopts;
 839                 break;
 840
 841         case IPV6_2292DSTOPTS:
 842                 val = np->rxopt.bits.odstopts;
 843                 break;
 844
 845         case IPV6_TCLASS:
 846                 val = np->tclass;
 847                 break;
 848
 849         case IPV6_RECVTCLASS:
 850                 val = np->rxopt.bits.rxtclass;
 851                 break;
 852
 853         case IPV6_FLOWINFO:
 854                 val = np->rxopt.bits.rxflow;
 855                 break;
 856
 857         case IPV6_UNICAST_HOPS:
 858                 val = np->hop_limit;
 859                 break;
 860
 861         case IPV6_MULTICAST_HOPS:
 862                 val = np->mcast_hops;
 863                 break;
 864
 865         case IPV6_MULTICAST_LOOP:
 866                 val = np->mc_loop;
 867                 break;
 868
 869         case IPV6_MULTICAST_IF:
 870                 val = np->mcast_oif;
 871                 break;
 872
 873         case IPV6_MTU_DISCOVER:
 874                 val = np->pmtudisc;
 875                 break;
 876
 877         case IPV6_RECVERR:
 878                 val = np->recverr;
 879                 break;
 880
 881         case IPV6_FLOWINFO_SEND:
 882                 val = np->sndflow;
 883                 break;
 884
 885         default:
 886                 return -EINVAL;
 887         }
 888         len = min_t(unsigned int, sizeof(int), len);
 889         if(put_user(len, optlen))
 890                 return -EFAULT;
 891         if(copy_to_user(optval,&val,len))
 892                 return -EFAULT;
 893         return 0;
 894 }
 895
 896 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 897                     char __user *optval, int __user *optlen)
 898 {
 899         int err;
 900
 901         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 902                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 903
 904         if(level != SOL_IPV6)
 905                 return -ENOPROTOOPT;
 906
 907         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
 908 #ifdef CONFIG_NETFILTER
 909         /* we need to exclude all possible EINVALs except default case */
 910         if (err == -EINVAL && optname != IPV6_ADDRFORM &&
 911                         optname != MCAST_MSFILTER) {
 912                 int len;
 913
 914                 if (get_user(len, optlen))
 915                         return -EFAULT;
 916
 917                 lock_sock(sk);
 918                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
 919                                 &len);
 920                 release_sock(sk);
 921                 if (err >= 0)
 922                         err = put_user(len, optlen);
 923         }
 924 #endif
 925         return err;
 926 }
 927
 928 #ifdef CONFIG_COMPAT
 929 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
 930                            char __user *optval, int __user *optlen)
 931 {
 932         int err;
 933
 934         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 935                 if (udp_prot.compat_getsockopt != NULL)
 936                         return udp_prot.compat_getsockopt(sk, level, optname,
 937                                                           optval, optlen);
 938                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 939         }
 940
 941         if (level != SOL_IPV6)
 942                 return -ENOPROTOOPT;
 943
 944         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
 945 #ifdef CONFIG_NETFILTER
 946         /* we need to exclude all possible EINVALs except default case */
 947         if (err == -EINVAL && optname != IPV6_ADDRFORM &&
 948                         optname != MCAST_MSFILTER) {
 949                 int len;
 950
 951                 if (get_user(len, optlen))
 952                         return -EFAULT;
 953
 954                 lock_sock(sk);
 955                 err = compat_nf_getsockopt(sk, PF_INET6,
 956                                            optname, optval, &len);
 957                 release_sock(sk);
 958                 if (err >= 0)
 959                         err = put_user(len, optlen);
 960         }
 961 #endif
 962         return err;
 963 }
 964
 965 EXPORT_SYMBOL(compat_ipv6_getsockopt);
 966 #endif
 967
 968 void __init ipv6_packet_init(void)
 969 {
 970         dev_add_pack(&ipv6_packet_type);
 971 }
 972
 973 void ipv6_packet_cleanup(void)
 974 {
 975         dev_remove_pack(&ipv6_packet_type);
 976 }