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 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 113                     char __user *optval, int optlen)
 114 {
 115         struct ipv6_pinfo *np = inet6_sk(sk);
 116         int val, valbool;
 117         int retv = -ENOPROTOOPT;
 118
 119         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 120                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 121
 122         if(level!=SOL_IPV6)
 123                 goto out;
 124
 125         if (optval == NULL)
 126                 val=0;
 127         else if (get_user(val, (int __user *) optval))
 128                 return -EFAULT;
 129
 130         valbool = (val!=0);
 131
 132         lock_sock(sk);
 133
 134         switch (optname) {
 135
 136         case IPV6_ADDRFORM:
 137                 if (val == PF_INET) {
 138                         struct ipv6_txoptions *opt;
 139                         struct sk_buff *pktopt;
 140
 141                         if (sk->sk_protocol != IPPROTO_UDP &&
 142                             sk->sk_protocol != IPPROTO_TCP)
 143                                 break;
 144
 145                         if (sk->sk_state != TCP_ESTABLISHED) {
 146                                 retv = -ENOTCONN;
 147                                 break;
 148                         }
 149
 150                         if (ipv6_only_sock(sk) ||
 151                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 152                                 retv = -EADDRNOTAVAIL;
 153                                 break;
 154                         }
 155
 156                         fl6_free_socklist(sk);
 157                         ipv6_sock_mc_close(sk);
 158
 159                         /*
 160                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 161                          * remove it from the refcnt debug socks count in the
 162                          * original family...
 163                          */
 164                         sk_refcnt_debug_dec(sk);
 165
 166                         if (sk->sk_protocol == IPPROTO_TCP) {
 167                                 struct inet_connection_sock *icsk = inet_csk(sk);
 168
 169                                 local_bh_disable();
 170                                 sock_prot_dec_use(sk->sk_prot);
 171                                 sock_prot_inc_use(&tcp_prot);
 172                                 local_bh_enable();
 173                                 sk->sk_prot = &tcp_prot;
 174                                 icsk->icsk_af_ops = &ipv4_specific;
 175                                 sk->sk_socket->ops = &inet_stream_ops;
 176                                 sk->sk_family = PF_INET;
 177                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 178                         } else {
 179                                 local_bh_disable();
 180                                 sock_prot_dec_use(sk->sk_prot);
 181                                 sock_prot_inc_use(&udp_prot);
 182                                 local_bh_enable();
 183                                 sk->sk_prot = &udp_prot;
 184                                 sk->sk_socket->ops = &inet_dgram_ops;
 185                                 sk->sk_family = PF_INET;
 186                         }
 187                         opt = xchg(&np->opt, NULL);
 188                         if (opt)
 189                                 sock_kfree_s(sk, opt, opt->tot_len);
 190                         pktopt = xchg(&np->pktoptions, NULL);
 191                         if (pktopt)
 192                                 kfree_skb(pktopt);
 193
 194                         sk->sk_destruct = inet_sock_destruct;
 195                         /*
 196                          * ... and add it to the refcnt debug socks count
 197                          * in the new family. -acme
 198                          */
 199                         sk_refcnt_debug_inc(sk);
 200                         module_put(THIS_MODULE);
 201                         retv = 0;
 202                         break;
 203                 }
 204                 goto e_inval;
 205
 206         case IPV6_V6ONLY:
 207                 if (inet_sk(sk)->num)
 208                         goto e_inval;
 209                 np->ipv6only = valbool;
 210                 retv = 0;
 211                 break;
 212
 213         case IPV6_RECVPKTINFO:
 214                 np->rxopt.bits.rxinfo = valbool;
 215                 retv = 0;
 216                 break;
 217
 218         case IPV6_2292PKTINFO:
 219                 np->rxopt.bits.rxoinfo = valbool;
 220                 retv = 0;
 221                 break;
 222
 223         case IPV6_RECVHOPLIMIT:
 224                 np->rxopt.bits.rxhlim = valbool;
 225                 retv = 0;
 226                 break;
 227
 228         case IPV6_2292HOPLIMIT:
 229                 np->rxopt.bits.rxohlim = valbool;
 230                 retv = 0;
 231                 break;
 232
 233         case IPV6_RECVRTHDR:
 234                 if (val < 0 || val > 2)
 235                         goto e_inval;
 236                 np->rxopt.bits.srcrt = val;
 237                 retv = 0;
 238                 break;
 239
 240         case IPV6_2292RTHDR:
 241                 if (val < 0 || val > 2)
 242                         goto e_inval;
 243                 np->rxopt.bits.osrcrt = val;
 244                 retv = 0;
 245                 break;
 246
 247         case IPV6_RECVHOPOPTS:
 248                 np->rxopt.bits.hopopts = valbool;
 249                 retv = 0;
 250                 break;
 251
 252         case IPV6_2292HOPOPTS:
 253                 np->rxopt.bits.ohopopts = valbool;
 254                 retv = 0;
 255                 break;
 256
 257         case IPV6_RECVDSTOPTS:
 258                 np->rxopt.bits.dstopts = valbool;
 259                 retv = 0;
 260                 break;
 261
 262         case IPV6_2292DSTOPTS:
 263                 np->rxopt.bits.odstopts = valbool;
 264                 retv = 0;
 265                 break;
 266
 267         case IPV6_TCLASS:
 268                 if (val < 0 || val > 0xff)
 269                         goto e_inval;
 270                 np->tclass = val;
 271                 retv = 0;
 272                 break;
 273
 274         case IPV6_RECVTCLASS:
 275                 np->rxopt.bits.rxtclass = valbool;
 276                 retv = 0;
 277                 break;
 278
 279         case IPV6_FLOWINFO:
 280                 np->rxopt.bits.rxflow = valbool;
 281                 retv = 0;
 282                 break;
 283
 284         case IPV6_HOPOPTS:
 285         case IPV6_RTHDRDSTOPTS:
 286         case IPV6_RTHDR:
 287         case IPV6_DSTOPTS:
 288         {
 289                 struct ipv6_txoptions *opt;
 290                 if (optlen == 0)
 291                         optval = NULL;
 292
 293                 /* hop-by-hop / destination options are privileged option */
 294                 retv = -EPERM;
 295                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 296                         break;
 297
 298                 retv = -EINVAL;
 299                 if (optlen & 0x7 || optlen > 8 * 255)
 300                         break;
 301
 302                 opt = ipv6_renew_options(sk, np->opt, optname,
 303                                          (struct ipv6_opt_hdr __user *)optval,
 304                                          optlen);
 305                 if (IS_ERR(opt)) {
 306                         retv = PTR_ERR(opt);
 307                         break;
 308                 }
 309
 310                 /* routing header option needs extra check */
 311                 if (optname == IPV6_RTHDR && opt->srcrt) {
 312                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 313                         if (rthdr->type)
 314                                 goto sticky_done;
 315                         if ((rthdr->hdrlen & 1) ||
 316                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 317                                 goto sticky_done;
 318                 }
 319
 320                 retv = 0;
 321                 if (inet_sk(sk)->is_icsk) {
 322                         if (opt) {
 323                                 struct inet_connection_sock *icsk = inet_csk(sk);
 324                                 if (!((1 << sk->sk_state) &
 325                                       (TCPF_LISTEN | TCPF_CLOSE))
 326                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 327                                         icsk->icsk_ext_hdr_len =
 328                                                 opt->opt_flen + opt->opt_nflen;
 329                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 330                                 }
 331                         }
 332                         opt = xchg(&np->opt, opt);
 333                         sk_dst_reset(sk);
 334                 } else {
 335                         write_lock(&sk->sk_dst_lock);
 336                         opt = xchg(&np->opt, opt);
 337                         write_unlock(&sk->sk_dst_lock);
 338                         sk_dst_reset(sk);
 339                 }
 340 sticky_done:
 341                 if (opt)
 342                         sock_kfree_s(sk, opt, opt->tot_len);
 343                 break;
 344         }
 345
 346         case IPV6_2292PKTOPTIONS:
 347         {
 348                 struct ipv6_txoptions *opt = NULL;
 349                 struct msghdr msg;
 350                 struct flowi fl;
 351                 int junk;
 352
 353                 fl.fl6_flowlabel = 0;
 354                 fl.oif = sk->sk_bound_dev_if;
 355
 356                 if (optlen == 0)
 357                         goto update;
 358
 359                 /* 1K is probably excessive
 360                  * 1K is surely not enough, 2K per standard header is 16K.
 361                  */
 362                 retv = -EINVAL;
 363                 if (optlen > 64*1024)
 364                         break;
 365
 366                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 367                 retv = -ENOBUFS;
 368                 if (opt == NULL)
 369                         break;
 370
 371                 memset(opt, 0, sizeof(*opt));
 372                 opt->tot_len = sizeof(*opt) + optlen;
 373                 retv = -EFAULT;
 374                 if (copy_from_user(opt+1, optval, optlen))
 375                         goto done;
 376
 377                 msg.msg_controllen = optlen;
 378                 msg.msg_control = (void*)(opt+1);
 379
 380                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 381                 if (retv)
 382                         goto done;
 383 update:
 384                 retv = 0;
 385                 if (inet_sk(sk)->is_icsk) {
 386                         if (opt) {
 387                                 struct inet_connection_sock *icsk = inet_csk(sk);
 388                                 if (!((1 << sk->sk_state) &
 389                                       (TCPF_LISTEN | TCPF_CLOSE))
 390                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 391                                         icsk->icsk_ext_hdr_len =
 392                                                 opt->opt_flen + opt->opt_nflen;
 393                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 394                                 }
 395                         }
 396                         opt = xchg(&np->opt, opt);
 397                         sk_dst_reset(sk);
 398                 } else {
 399                         write_lock(&sk->sk_dst_lock);
 400                         opt = xchg(&np->opt, opt);
 401                         write_unlock(&sk->sk_dst_lock);
 402                         sk_dst_reset(sk);
 403                 }
 404
 405 done:
 406                 if (opt)
 407                         sock_kfree_s(sk, opt, opt->tot_len);
 408                 break;
 409         }
 410         case IPV6_UNICAST_HOPS:
 411                 if (val > 255 || val < -1)
 412                         goto e_inval;
 413                 np->hop_limit = val;
 414                 retv = 0;
 415                 break;
 416
 417         case IPV6_MULTICAST_HOPS:
 418                 if (sk->sk_type == SOCK_STREAM)
 419                         goto e_inval;
 420                 if (val > 255 || val < -1)
 421                         goto e_inval;
 422                 np->mcast_hops = val;
 423                 retv = 0;
 424                 break;
 425
 426         case IPV6_MULTICAST_LOOP:
 427                 np->mc_loop = valbool;
 428                 retv = 0;
 429                 break;
 430
 431         case IPV6_MULTICAST_IF:
 432                 if (sk->sk_type == SOCK_STREAM)
 433                         goto e_inval;
 434                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 435                         goto e_inval;
 436
 437                 if (__dev_get_by_index(val) == NULL) {
 438                         retv = -ENODEV;
 439                         break;
 440                 }
 441                 np->mcast_oif = val;
 442                 retv = 0;
 443                 break;
 444         case IPV6_ADD_MEMBERSHIP:
 445         case IPV6_DROP_MEMBERSHIP:
 446         {
 447                 struct ipv6_mreq mreq;
 448
 449                 retv = -EFAULT;
 450                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 451                         break;
 452
 453                 if (optname == IPV6_ADD_MEMBERSHIP)
 454                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 455                 else
 456                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 457                 break;
 458         }
 459         case IPV6_JOIN_ANYCAST:
 460         case IPV6_LEAVE_ANYCAST:
 461         {
 462                 struct ipv6_mreq mreq;
 463
 464                 if (optlen != sizeof(struct ipv6_mreq))
 465                         goto e_inval;
 466
 467                 retv = -EFAULT;
 468                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 469                         break;
 470
 471                 if (optname == IPV6_JOIN_ANYCAST)
 472                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 473                 else
 474                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 475                 break;
 476         }
 477         case MCAST_JOIN_GROUP:
 478         case MCAST_LEAVE_GROUP:
 479         {
 480                 struct group_req greq;
 481                 struct sockaddr_in6 *psin6;
 482
 483                 retv = -EFAULT;
 484                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 485                         break;
 486                 if (greq.gr_group.ss_family != AF_INET6) {
 487                         retv = -EADDRNOTAVAIL;
 488                         break;
 489                 }
 490                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 491                 if (optname == MCAST_JOIN_GROUP)
 492                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 493                                 &psin6->sin6_addr);
 494                 else
 495                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 496                                 &psin6->sin6_addr);
 497                 break;
 498         }
 499         case MCAST_JOIN_SOURCE_GROUP:
 500         case MCAST_LEAVE_SOURCE_GROUP:
 501         case MCAST_BLOCK_SOURCE:
 502         case MCAST_UNBLOCK_SOURCE:
 503         {
 504                 struct group_source_req greqs;
 505                 int omode, add;
 506
 507                 if (optlen != sizeof(struct group_source_req))
 508                         goto e_inval;
 509                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 510                         retv = -EFAULT;
 511                         break;
 512                 }
 513                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 514                     greqs.gsr_source.ss_family != AF_INET6) {
 515                         retv = -EADDRNOTAVAIL;
 516                         break;
 517                 }
 518                 if (optname == MCAST_BLOCK_SOURCE) {
 519                         omode = MCAST_EXCLUDE;
 520                         add = 1;
 521                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 522                         omode = MCAST_EXCLUDE;
 523                         add = 0;
 524                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 525                         struct sockaddr_in6 *psin6;
 526
 527                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 528                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 529                                 &psin6->sin6_addr);
 530                         /* prior join w/ different source is ok */
 531                         if (retv && retv != -EADDRINUSE)
 532                                 break;
 533                         omode = MCAST_INCLUDE;
 534                         add = 1;
 535                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 536                         omode = MCAST_INCLUDE;
 537                         add = 0;
 538                 }
 539                 retv = ip6_mc_source(add, omode, sk, &greqs);
 540                 break;
 541         }
 542         case MCAST_MSFILTER:
 543         {
 544                 extern int sysctl_mld_max_msf;
 545                 struct group_filter *gsf;
 546
 547                 if (optlen < GROUP_FILTER_SIZE(0))
 548                         goto e_inval;
 549                 if (optlen > sysctl_optmem_max) {
 550                         retv = -ENOBUFS;
 551                         break;
 552                 }
 553                 gsf = kmalloc(optlen,GFP_KERNEL);
 554                 if (gsf == 0) {
 555                         retv = -ENOBUFS;
 556                         break;
 557                 }
 558                 retv = -EFAULT;
 559                 if (copy_from_user(gsf, optval, optlen)) {
 560                         kfree(gsf);
 561                         break;
 562                 }
 563                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 564                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 565                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 566                         kfree(gsf);
 567                         retv = -ENOBUFS;
 568                         break;
 569                 }
 570                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 571                         kfree(gsf);
 572                         retv = -EINVAL;
 573                         break;
 574                 }
 575                 retv = ip6_mc_msfilter(sk, gsf);
 576                 kfree(gsf);
 577
 578                 break;
 579         }
 580         case IPV6_ROUTER_ALERT:
 581                 retv = ip6_ra_control(sk, val, NULL);
 582                 break;
 583         case IPV6_MTU_DISCOVER:
 584                 if (val<0 || val>2)
 585                         goto e_inval;
 586                 np->pmtudisc = val;
 587                 retv = 0;
 588                 break;
 589         case IPV6_MTU:
 590                 if (val && val < IPV6_MIN_MTU)
 591                         goto e_inval;
 592                 np->frag_size = val;
 593                 retv = 0;
 594                 break;
 595         case IPV6_RECVERR:
 596                 np->recverr = valbool;
 597                 if (!val)
 598                         skb_queue_purge(&sk->sk_error_queue);
 599                 retv = 0;
 600                 break;
 601         case IPV6_FLOWINFO_SEND:
 602                 np->sndflow = valbool;
 603                 retv = 0;
 604                 break;
 605         case IPV6_FLOWLABEL_MGR:
 606                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 607                 break;
 608         case IPV6_IPSEC_POLICY:
 609         case IPV6_XFRM_POLICY:
 610                 retv = -EPERM;
 611                 if (!capable(CAP_NET_ADMIN))
 612                         break;
 613                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 614                 break;
 615
 616 #ifdef CONFIG_NETFILTER
 617         default:
 618                 retv = nf_setsockopt(sk, PF_INET6, optname, optval,
 619                                             optlen);
 620                 break;
 621 #endif
 622
 623         }
 624         release_sock(sk);
 625
 626 out:
 627         return retv;
 628
 629 e_inval:
 630         release_sock(sk);
 631         return -EINVAL;
 632 }
 633
 634 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
 635                                   char __user *optval, int len)
 636 {
 637         if (!hdr)
 638                 return 0;
 639         len = min_t(int, len, ipv6_optlen(hdr));
 640         if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
 641                 return -EFAULT;
 642         return len;
 643 }
 644
 645 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 646                     char __user *optval, int __user *optlen)
 647 {
 648         struct ipv6_pinfo *np = inet6_sk(sk);
 649         int len;
 650         int val;
 651
 652         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 653                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 654         if(level!=SOL_IPV6)
 655                 return -ENOPROTOOPT;
 656         if (get_user(len, optlen))
 657                 return -EFAULT;
 658         switch (optname) {
 659         case IPV6_ADDRFORM:
 660                 if (sk->sk_protocol != IPPROTO_UDP &&
 661                     sk->sk_protocol != IPPROTO_TCP)
 662                         return -EINVAL;
 663                 if (sk->sk_state != TCP_ESTABLISHED)
 664                         return -ENOTCONN;
 665                 val = sk->sk_family;
 666                 break;
 667         case MCAST_MSFILTER:
 668         {
 669                 struct group_filter gsf;
 670                 int err;
 671
 672                 if (len < GROUP_FILTER_SIZE(0))
 673                         return -EINVAL;
 674                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 675                         return -EFAULT;
 676                 lock_sock(sk);
 677                 err = ip6_mc_msfget(sk, &gsf,
 678                         (struct group_filter __user *)optval, optlen);
 679                 release_sock(sk);
 680                 return err;
 681         }
 682
 683         case IPV6_2292PKTOPTIONS:
 684         {
 685                 struct msghdr msg;
 686                 struct sk_buff *skb;
 687
 688                 if (sk->sk_type != SOCK_STREAM)
 689                         return -ENOPROTOOPT;
 690
 691                 msg.msg_control = optval;
 692                 msg.msg_controllen = len;
 693                 msg.msg_flags = 0;
 694
 695                 lock_sock(sk);
 696                 skb = np->pktoptions;
 697                 if (skb)
 698                         atomic_inc(&skb->users);
 699                 release_sock(sk);
 700
 701                 if (skb) {
 702                         int err = datagram_recv_ctl(sk, &msg, skb);
 703                         kfree_skb(skb);
 704                         if (err)
 705                                 return err;
 706                 } else {
 707                         if (np->rxopt.bits.rxinfo) {
 708                                 struct in6_pktinfo src_info;
 709                                 src_info.ipi6_ifindex = np->mcast_oif;
 710                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 711                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 712                         }
 713                         if (np->rxopt.bits.rxhlim) {
 714                                 int hlim = np->mcast_hops;
 715                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 716                         }
 717                         if (np->rxopt.bits.rxoinfo) {
 718                                 struct in6_pktinfo src_info;
 719                                 src_info.ipi6_ifindex = np->mcast_oif;
 720                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 721                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 722                         }
 723                         if (np->rxopt.bits.rxohlim) {
 724                                 int hlim = np->mcast_hops;
 725                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 726                         }
 727                 }
 728                 len -= msg.msg_controllen;
 729                 return put_user(len, optlen);
 730         }
 731         case IPV6_MTU:
 732         {
 733                 struct dst_entry *dst;
 734                 val = 0;
 735                 lock_sock(sk);
 736                 dst = sk_dst_get(sk);
 737                 if (dst) {
 738                         val = dst_mtu(dst);
 739                         dst_release(dst);
 740                 }
 741                 release_sock(sk);
 742                 if (!val)
 743                         return -ENOTCONN;
 744                 break;
 745         }
 746
 747         case IPV6_V6ONLY:
 748                 val = np->ipv6only;
 749                 break;
 750
 751         case IPV6_RECVPKTINFO:
 752                 val = np->rxopt.bits.rxinfo;
 753                 break;
 754
 755         case IPV6_2292PKTINFO:
 756                 val = np->rxopt.bits.rxoinfo;
 757                 break;
 758
 759         case IPV6_RECVHOPLIMIT:
 760                 val = np->rxopt.bits.rxhlim;
 761                 break;
 762
 763         case IPV6_2292HOPLIMIT:
 764                 val = np->rxopt.bits.rxohlim;
 765                 break;
 766
 767         case IPV6_RECVRTHDR:
 768                 val = np->rxopt.bits.srcrt;
 769                 break;
 770
 771         case IPV6_2292RTHDR:
 772                 val = np->rxopt.bits.osrcrt;
 773                 break;
 774
 775         case IPV6_HOPOPTS:
 776         case IPV6_RTHDRDSTOPTS:
 777         case IPV6_RTHDR:
 778         case IPV6_DSTOPTS:
 779         {
 780
 781                 lock_sock(sk);
 782                 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
 783                                              optval, len);
 784                 release_sock(sk);
 785                 return put_user(len, optlen);
 786         }
 787
 788         case IPV6_RECVHOPOPTS:
 789                 val = np->rxopt.bits.hopopts;
 790                 break;
 791
 792         case IPV6_2292HOPOPTS:
 793                 val = np->rxopt.bits.ohopopts;
 794                 break;
 795
 796         case IPV6_RECVDSTOPTS:
 797                 val = np->rxopt.bits.dstopts;
 798                 break;
 799
 800         case IPV6_2292DSTOPTS:
 801                 val = np->rxopt.bits.odstopts;
 802                 break;
 803
 804         case IPV6_TCLASS:
 805                 val = np->tclass;
 806                 break;
 807
 808         case IPV6_RECVTCLASS:
 809                 val = np->rxopt.bits.rxtclass;
 810                 break;
 811
 812         case IPV6_FLOWINFO:
 813                 val = np->rxopt.bits.rxflow;
 814                 break;
 815
 816         case IPV6_UNICAST_HOPS:
 817                 val = np->hop_limit;
 818                 break;
 819
 820         case IPV6_MULTICAST_HOPS:
 821                 val = np->mcast_hops;
 822                 break;
 823
 824         case IPV6_MULTICAST_LOOP:
 825                 val = np->mc_loop;
 826                 break;
 827
 828         case IPV6_MULTICAST_IF:
 829                 val = np->mcast_oif;
 830                 break;
 831
 832         case IPV6_MTU_DISCOVER:
 833                 val = np->pmtudisc;
 834                 break;
 835
 836         case IPV6_RECVERR:
 837                 val = np->recverr;
 838                 break;
 839
 840         case IPV6_FLOWINFO_SEND:
 841                 val = np->sndflow;
 842                 break;
 843
 844         default:
 845 #ifdef CONFIG_NETFILTER
 846                 lock_sock(sk);
 847                 val = nf_getsockopt(sk, PF_INET6, optname, optval,
 848                                     &len);
 849                 release_sock(sk);
 850                 if (val >= 0)
 851                         val = put_user(len, optlen);
 852                 return val;
 853 #else
 854                 return -EINVAL;
 855 #endif
 856         }
 857         len = min_t(unsigned int, sizeof(int), len);
 858         if(put_user(len, optlen))
 859                 return -EFAULT;
 860         if(copy_to_user(optval,&val,len))
 861                 return -EFAULT;
 862         return 0;
 863 }
 864
 865 void __init ipv6_packet_init(void)
 866 {
 867         dev_add_pack(&ipv6_packet_type);
 868 }
 869
 870 void ipv6_packet_cleanup(void)
 871 {
 872         dev_remove_pack(&ipv6_packet_type);
 873 }