net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  *      FIXME: Make the setsockopt code POSIX compliant: That is
  18  *
  19  *      o       Return -EINVAL for setsockopt of short lengths
  20  *      o       Truncate getsockopt returns
  21  *      o       Return an optlen of the truncated length if need be
  22  *
  23  *      Changes:
  24  *      David L Stevens <dlstevens@us.ibm.com>:
  25  *              - added multicast source filtering API for MLDv2
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/config.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/socket.h>
  33 #include <linux/sockios.h>
  34 #include <linux/sched.h>
  35 #include <linux/net.h>
  36 #include <linux/in6.h>
  37 #include <linux/netdevice.h>
  38 #include <linux/if_arp.h>
  39 #include <linux/init.h>
  40 #include <linux/sysctl.h>
  41 #include <linux/netfilter.h>
  42
  43 #include <net/sock.h>
  44 #include <net/snmp.h>
  45 #include <net/ipv6.h>
  46 #include <net/ndisc.h>
  47 #include <net/protocol.h>
  48 #include <net/transp_v6.h>
  49 #include <net/ip6_route.h>
  50 #include <net/addrconf.h>
  51 #include <net/inet_common.h>
  52 #include <net/tcp.h>
  53 #include <net/udp.h>
  54 #include <net/xfrm.h>
  55
  56 #include <asm/uaccess.h>
  57
  58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  59
  60 static struct packet_type ipv6_packet_type = {
  61         .type = __constant_htons(ETH_P_IPV6),
  62         .func = ipv6_rcv,
  63 };
  64
  65 struct ip6_ra_chain *ip6_ra_chain;
  66 DEFINE_RWLOCK(ip6_ra_lock);
  67
  68 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
  69 {
  70         struct ip6_ra_chain *ra, *new_ra, **rap;
  71
  72         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  73         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
  74                 return -EINVAL;
  75
  76         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  77
  78         write_lock_bh(&ip6_ra_lock);
  79         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  80                 if (ra->sk == sk) {
  81                         if (sel>=0) {
  82                                 write_unlock_bh(&ip6_ra_lock);
  83                                 kfree(new_ra);
  84                                 return -EADDRINUSE;
  85                         }
  86
  87                         *rap = ra->next;
  88                         write_unlock_bh(&ip6_ra_lock);
  89
  90                         if (ra->destructor)
  91                                 ra->destructor(sk);
  92                         sock_put(sk);
  93                         kfree(ra);
  94                         return 0;
  95                 }
  96         }
  97         if (new_ra == NULL) {
  98                 write_unlock_bh(&ip6_ra_lock);
  99                 return -ENOBUFS;
 100         }
 101         new_ra->sk = sk;
 102         new_ra->sel = sel;
 103         new_ra->destructor = destructor;
 104         new_ra->next = ra;
 105         *rap = new_ra;
 106         sock_hold(sk);
 107         write_unlock_bh(&ip6_ra_lock);
 108         return 0;
 109 }
 110
 111 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 112                     char __user *optval, int optlen)
 113 {
 114         struct ipv6_pinfo *np = inet6_sk(sk);
 115         int val, valbool;
 116         int retv = -ENOPROTOOPT;
 117
 118         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 119                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 120
 121         if(level!=SOL_IPV6)
 122                 goto out;
 123
 124         if (optval == NULL)
 125                 val=0;
 126         else if (get_user(val, (int __user *) optval))
 127                 return -EFAULT;
 128
 129         valbool = (val!=0);
 130
 131         lock_sock(sk);
 132
 133         switch (optname) {
 134
 135         case IPV6_ADDRFORM:
 136                 if (val == PF_INET) {
 137                         struct ipv6_txoptions *opt;
 138                         struct sk_buff *pktopt;
 139
 140                         if (sk->sk_protocol != IPPROTO_UDP &&
 141                             sk->sk_protocol != IPPROTO_TCP)
 142                                 break;
 143
 144                         if (sk->sk_state != TCP_ESTABLISHED) {
 145                                 retv = -ENOTCONN;
 146                                 break;
 147                         }
 148
 149                         if (ipv6_only_sock(sk) ||
 150                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 151                                 retv = -EADDRNOTAVAIL;
 152                                 break;
 153                         }
 154
 155                         fl6_free_socklist(sk);
 156                         ipv6_sock_mc_close(sk);
 157
 158                         /*
 159                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 160                          * remove it from the refcnt debug socks count in the
 161                          * original family...
 162                          */
 163                         sk_refcnt_debug_dec(sk);
 164
 165                         if (sk->sk_protocol == IPPROTO_TCP) {
 166                                 struct tcp_sock *tp = tcp_sk(sk);
 167
 168                                 local_bh_disable();
 169                                 sock_prot_dec_use(sk->sk_prot);
 170                                 sock_prot_inc_use(&tcp_prot);
 171                                 local_bh_enable();
 172                                 sk->sk_prot = &tcp_prot;
 173                                 tp->af_specific = &ipv4_specific;
 174                                 sk->sk_socket->ops = &inet_stream_ops;
 175                                 sk->sk_family = PF_INET;
 176                                 tcp_sync_mss(sk, tp->pmtu_cookie);
 177                         } else {
 178                                 local_bh_disable();
 179                                 sock_prot_dec_use(sk->sk_prot);
 180                                 sock_prot_inc_use(&udp_prot);
 181                                 local_bh_enable();
 182                                 sk->sk_prot = &udp_prot;
 183                                 sk->sk_socket->ops = &inet_dgram_ops;
 184                                 sk->sk_family = PF_INET;
 185                         }
 186                         opt = xchg(&np->opt, NULL);
 187                         if (opt)
 188                                 sock_kfree_s(sk, opt, opt->tot_len);
 189                         pktopt = xchg(&np->pktoptions, NULL);
 190                         if (pktopt)
 191                                 kfree_skb(pktopt);
 192
 193                         sk->sk_destruct = inet_sock_destruct;
 194                         /*
 195                          * ... and add it to the refcnt debug socks count
 196                          * in the new family. -acme
 197                          */
 198                         sk_refcnt_debug_inc(sk);
 199                         module_put(THIS_MODULE);
 200                         retv = 0;
 201                         break;
 202                 }
 203                 goto e_inval;
 204
 205         case IPV6_V6ONLY:
 206                 if (inet_sk(sk)->num)
 207                         goto e_inval;
 208                 np->ipv6only = valbool;
 209                 retv = 0;
 210                 break;
 211
 212         case IPV6_RECVPKTINFO:
 213                 np->rxopt.bits.rxinfo = valbool;
 214                 retv = 0;
 215                 break;
 216
 217         case IPV6_2292PKTINFO:
 218                 np->rxopt.bits.rxoinfo = valbool;
 219                 retv = 0;
 220                 break;
 221
 222         case IPV6_RECVHOPLIMIT:
 223                 np->rxopt.bits.rxhlim = valbool;
 224                 retv = 0;
 225                 break;
 226
 227         case IPV6_2292HOPLIMIT:
 228                 np->rxopt.bits.rxohlim = valbool;
 229                 retv = 0;
 230                 break;
 231
 232         case IPV6_RECVRTHDR:
 233                 if (val < 0 || val > 2)
 234                         goto e_inval;
 235                 np->rxopt.bits.srcrt = val;
 236                 retv = 0;
 237                 break;
 238
 239         case IPV6_2292RTHDR:
 240                 if (val < 0 || val > 2)
 241                         goto e_inval;
 242                 np->rxopt.bits.osrcrt = val;
 243                 retv = 0;
 244                 break;
 245
 246         case IPV6_RECVHOPOPTS:
 247                 np->rxopt.bits.hopopts = valbool;
 248                 retv = 0;
 249                 break;
 250
 251         case IPV6_2292HOPOPTS:
 252                 np->rxopt.bits.ohopopts = valbool;
 253                 retv = 0;
 254                 break;
 255
 256         case IPV6_RECVDSTOPTS:
 257                 np->rxopt.bits.dstopts = valbool;
 258                 retv = 0;
 259                 break;
 260
 261         case IPV6_2292DSTOPTS:
 262                 np->rxopt.bits.odstopts = valbool;
 263                 retv = 0;
 264                 break;
 265
 266         case IPV6_TCLASS:
 267                 if (val < 0 || val > 0xff)
 268                         goto e_inval;
 269                 np->tclass = val;
 270                 retv = 0;
 271                 break;
 272
 273         case IPV6_RECVTCLASS:
 274                 np->rxopt.bits.rxtclass = valbool;
 275                 retv = 0;
 276                 break;
 277
 278         case IPV6_FLOWINFO:
 279                 np->rxopt.bits.rxflow = valbool;
 280                 retv = 0;
 281                 break;
 282
 283         case IPV6_HOPOPTS:
 284         case IPV6_RTHDRDSTOPTS:
 285         case IPV6_RTHDR:
 286         case IPV6_DSTOPTS:
 287         {
 288                 struct ipv6_txoptions *opt;
 289                 if (optlen == 0)
 290                         optval = NULL;
 291
 292                 /* hop-by-hop / destination options are privileged option */
 293                 retv = -EPERM;
 294                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 295                         break;
 296
 297                 retv = -EINVAL;
 298                 if (optlen & 0x7 || optlen > 8 * 255)
 299                         break;
 300
 301                 opt = ipv6_renew_options(sk, np->opt, optname,
 302                                          (struct ipv6_opt_hdr __user *)optval,
 303                                          optlen);
 304                 if (IS_ERR(opt)) {
 305                         retv = PTR_ERR(opt);
 306                         break;
 307                 }
 308
 309                 /* routing header option needs extra check */
 310                 if (optname == IPV6_RTHDR && opt->srcrt) {
 311                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 312                         if (rthdr->type)
 313                                 goto sticky_done;
 314                         if ((rthdr->hdrlen & 1) ||
 315                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 316                                 goto sticky_done;
 317                 }
 318
 319                 retv = 0;
 320                 if (sk->sk_type == SOCK_STREAM) {
 321                         if (opt) {
 322                                 struct tcp_sock *tp = tcp_sk(sk);
 323                                 if (!((1 << sk->sk_state) &
 324                                       (TCPF_LISTEN | TCPF_CLOSE))
 325                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 326                                         tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
 327                                         tcp_sync_mss(sk, tp->pmtu_cookie);
 328                                 }
 329                         }
 330                         opt = xchg(&np->opt, opt);
 331                         sk_dst_reset(sk);
 332                 } else {
 333                         write_lock(&sk->sk_dst_lock);
 334                         opt = xchg(&np->opt, opt);
 335                         write_unlock(&sk->sk_dst_lock);
 336                         sk_dst_reset(sk);
 337                 }
 338 sticky_done:
 339                 if (opt)
 340                         sock_kfree_s(sk, opt, opt->tot_len);
 341                 break;
 342         }
 343
 344         case IPV6_2292PKTOPTIONS:
 345         {
 346                 struct ipv6_txoptions *opt = NULL;
 347                 struct msghdr msg;
 348                 struct flowi fl;
 349                 int junk;
 350
 351                 fl.fl6_flowlabel = 0;
 352                 fl.oif = sk->sk_bound_dev_if;
 353
 354                 if (optlen == 0)
 355                         goto update;
 356
 357                 /* 1K is probably excessive
 358                  * 1K is surely not enough, 2K per standard header is 16K.
 359                  */
 360                 retv = -EINVAL;
 361                 if (optlen > 64*1024)
 362                         break;
 363
 364                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 365                 retv = -ENOBUFS;
 366                 if (opt == NULL)
 367                         break;
 368
 369                 memset(opt, 0, sizeof(*opt));
 370                 opt->tot_len = sizeof(*opt) + optlen;
 371                 retv = -EFAULT;
 372                 if (copy_from_user(opt+1, optval, optlen))
 373                         goto done;
 374
 375                 msg.msg_controllen = optlen;
 376                 msg.msg_control = (void*)(opt+1);
 377
 378                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 379                 if (retv)
 380                         goto done;
 381 update:
 382                 retv = 0;
 383                 if (sk->sk_type == SOCK_STREAM) {
 384                         if (opt) {
 385                                 struct tcp_sock *tp = tcp_sk(sk);
 386                                 if (!((1 << sk->sk_state) &
 387                                       (TCPF_LISTEN | TCPF_CLOSE))
 388                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 389                                         tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
 390                                         tcp_sync_mss(sk, tp->pmtu_cookie);
 391                                 }
 392                         }
 393                         opt = xchg(&np->opt, opt);
 394                         sk_dst_reset(sk);
 395                 } else {
 396                         write_lock(&sk->sk_dst_lock);
 397                         opt = xchg(&np->opt, opt);
 398                         write_unlock(&sk->sk_dst_lock);
 399                         sk_dst_reset(sk);
 400                 }
 401
 402 done:
 403                 if (opt)
 404                         sock_kfree_s(sk, opt, opt->tot_len);
 405                 break;
 406         }
 407         case IPV6_UNICAST_HOPS:
 408                 if (val > 255 || val < -1)
 409                         goto e_inval;
 410                 np->hop_limit = val;
 411                 retv = 0;
 412                 break;
 413
 414         case IPV6_MULTICAST_HOPS:
 415                 if (sk->sk_type == SOCK_STREAM)
 416                         goto e_inval;
 417                 if (val > 255 || val < -1)
 418                         goto e_inval;
 419                 np->mcast_hops = val;
 420                 retv = 0;
 421                 break;
 422
 423         case IPV6_MULTICAST_LOOP:
 424                 np->mc_loop = valbool;
 425                 retv = 0;
 426                 break;
 427
 428         case IPV6_MULTICAST_IF:
 429                 if (sk->sk_type == SOCK_STREAM)
 430                         goto e_inval;
 431                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 432                         goto e_inval;
 433
 434                 if (__dev_get_by_index(val) == NULL) {
 435                         retv = -ENODEV;
 436                         break;
 437                 }
 438                 np->mcast_oif = val;
 439                 retv = 0;
 440                 break;
 441         case IPV6_ADD_MEMBERSHIP:
 442         case IPV6_DROP_MEMBERSHIP:
 443         {
 444                 struct ipv6_mreq mreq;
 445
 446                 retv = -EFAULT;
 447                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 448                         break;
 449
 450                 if (optname == IPV6_ADD_MEMBERSHIP)
 451                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 452                 else
 453                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 454                 break;
 455         }
 456         case IPV6_JOIN_ANYCAST:
 457         case IPV6_LEAVE_ANYCAST:
 458         {
 459                 struct ipv6_mreq mreq;
 460
 461                 if (optlen != sizeof(struct ipv6_mreq))
 462                         goto e_inval;
 463
 464                 retv = -EFAULT;
 465                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 466                         break;
 467
 468                 if (optname == IPV6_JOIN_ANYCAST)
 469                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 470                 else
 471                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 472                 break;
 473         }
 474         case MCAST_JOIN_GROUP:
 475         case MCAST_LEAVE_GROUP:
 476         {
 477                 struct group_req greq;
 478                 struct sockaddr_in6 *psin6;
 479
 480                 retv = -EFAULT;
 481                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 482                         break;
 483                 if (greq.gr_group.ss_family != AF_INET6) {
 484                         retv = -EADDRNOTAVAIL;
 485                         break;
 486                 }
 487                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 488                 if (optname == MCAST_JOIN_GROUP)
 489                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 490                                 &psin6->sin6_addr);
 491                 else
 492                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 493                                 &psin6->sin6_addr);
 494                 break;
 495         }
 496         case MCAST_JOIN_SOURCE_GROUP:
 497         case MCAST_LEAVE_SOURCE_GROUP:
 498         case MCAST_BLOCK_SOURCE:
 499         case MCAST_UNBLOCK_SOURCE:
 500         {
 501                 struct group_source_req greqs;
 502                 int omode, add;
 503
 504                 if (optlen != sizeof(struct group_source_req))
 505                         goto e_inval;
 506                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 507                         retv = -EFAULT;
 508                         break;
 509                 }
 510                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 511                     greqs.gsr_source.ss_family != AF_INET6) {
 512                         retv = -EADDRNOTAVAIL;
 513                         break;
 514                 }
 515                 if (optname == MCAST_BLOCK_SOURCE) {
 516                         omode = MCAST_EXCLUDE;
 517                         add = 1;
 518                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 519                         omode = MCAST_EXCLUDE;
 520                         add = 0;
 521                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 522                         struct sockaddr_in6 *psin6;
 523
 524                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 525                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 526                                 &psin6->sin6_addr);
 527                         /* prior join w/ different source is ok */
 528                         if (retv && retv != -EADDRINUSE)
 529                                 break;
 530                         omode = MCAST_INCLUDE;
 531                         add = 1;
 532                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 533                         omode = MCAST_INCLUDE;
 534                         add = 0;
 535                 }
 536                 retv = ip6_mc_source(add, omode, sk, &greqs);
 537                 break;
 538         }
 539         case MCAST_MSFILTER:
 540         {
 541                 extern int sysctl_mld_max_msf;
 542                 struct group_filter *gsf;
 543
 544                 if (optlen < GROUP_FILTER_SIZE(0))
 545                         goto e_inval;
 546                 if (optlen > sysctl_optmem_max) {
 547                         retv = -ENOBUFS;
 548                         break;
 549                 }
 550                 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
 551                 if (gsf == 0) {
 552                         retv = -ENOBUFS;
 553                         break;
 554                 }
 555                 retv = -EFAULT;
 556                 if (copy_from_user(gsf, optval, optlen)) {
 557                         kfree(gsf);
 558                         break;
 559                 }
 560                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 561                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 562                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 563                         kfree(gsf);
 564                         retv = -ENOBUFS;
 565                         break;
 566                 }
 567                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 568                         kfree(gsf);
 569                         retv = -EINVAL;
 570                         break;
 571                 }
 572                 retv = ip6_mc_msfilter(sk, gsf);
 573                 kfree(gsf);
 574
 575                 break;
 576         }
 577         case IPV6_ROUTER_ALERT:
 578                 retv = ip6_ra_control(sk, val, NULL);
 579                 break;
 580         case IPV6_MTU_DISCOVER:
 581                 if (val<0 || val>2)
 582                         goto e_inval;
 583                 np->pmtudisc = val;
 584                 retv = 0;
 585                 break;
 586         case IPV6_MTU:
 587                 if (val && val < IPV6_MIN_MTU)
 588                         goto e_inval;
 589                 np->frag_size = val;
 590                 retv = 0;
 591                 break;
 592         case IPV6_RECVERR:
 593                 np->recverr = valbool;
 594                 if (!val)
 595                         skb_queue_purge(&sk->sk_error_queue);
 596                 retv = 0;
 597                 break;
 598         case IPV6_FLOWINFO_SEND:
 599                 np->sndflow = valbool;
 600                 retv = 0;
 601                 break;
 602         case IPV6_FLOWLABEL_MGR:
 603                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 604                 break;
 605         case IPV6_IPSEC_POLICY:
 606         case IPV6_XFRM_POLICY:
 607                 retv = -EPERM;
 608                 if (!capable(CAP_NET_ADMIN))
 609                         break;
 610                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 611                 break;
 612
 613 #ifdef CONFIG_NETFILTER
 614         default:
 615                 retv = nf_setsockopt(sk, PF_INET6, optname, optval,
 616                                             optlen);
 617                 break;
 618 #endif
 619
 620         }
 621         release_sock(sk);
 622
 623 out:
 624         return retv;
 625
 626 e_inval:
 627         release_sock(sk);
 628         return -EINVAL;
 629 }
 630
 631 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
 632                                   char __user *optval, int len)
 633 {
 634         if (!hdr)
 635                 return 0;
 636         len = min_t(int, len, ipv6_optlen(hdr));
 637         if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
 638                 return -EFAULT;
 639         return len;
 640 }
 641
 642 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 643                     char __user *optval, int __user *optlen)
 644 {
 645         struct ipv6_pinfo *np = inet6_sk(sk);
 646         int len;
 647         int val;
 648
 649         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 650                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 651         if(level!=SOL_IPV6)
 652                 return -ENOPROTOOPT;
 653         if (get_user(len, optlen))
 654                 return -EFAULT;
 655         switch (optname) {
 656         case IPV6_ADDRFORM:
 657                 if (sk->sk_protocol != IPPROTO_UDP &&
 658                     sk->sk_protocol != IPPROTO_TCP)
 659                         return -EINVAL;
 660                 if (sk->sk_state != TCP_ESTABLISHED)
 661                         return -ENOTCONN;
 662                 val = sk->sk_family;
 663                 break;
 664         case MCAST_MSFILTER:
 665         {
 666                 struct group_filter gsf;
 667                 int err;
 668
 669                 if (len < GROUP_FILTER_SIZE(0))
 670                         return -EINVAL;
 671                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 672                         return -EFAULT;
 673                 lock_sock(sk);
 674                 err = ip6_mc_msfget(sk, &gsf,
 675                         (struct group_filter __user *)optval, optlen);
 676                 release_sock(sk);
 677                 return err;
 678         }
 679
 680         case IPV6_2292PKTOPTIONS:
 681         {
 682                 struct msghdr msg;
 683                 struct sk_buff *skb;
 684
 685                 if (sk->sk_type != SOCK_STREAM)
 686                         return -ENOPROTOOPT;
 687
 688                 msg.msg_control = optval;
 689                 msg.msg_controllen = len;
 690                 msg.msg_flags = 0;
 691
 692                 lock_sock(sk);
 693                 skb = np->pktoptions;
 694                 if (skb)
 695                         atomic_inc(&skb->users);
 696                 release_sock(sk);
 697
 698                 if (skb) {
 699                         int err = datagram_recv_ctl(sk, &msg, skb);
 700                         kfree_skb(skb);
 701                         if (err)
 702                                 return err;
 703                 } else {
 704                         if (np->rxopt.bits.rxinfo) {
 705                                 struct in6_pktinfo src_info;
 706                                 src_info.ipi6_ifindex = np->mcast_oif;
 707                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 708                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 709                         }
 710                         if (np->rxopt.bits.rxhlim) {
 711                                 int hlim = np->mcast_hops;
 712                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 713                         }
 714                         if (np->rxopt.bits.rxoinfo) {
 715                                 struct in6_pktinfo src_info;
 716                                 src_info.ipi6_ifindex = np->mcast_oif;
 717                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 718                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 719                         }
 720                         if (np->rxopt.bits.rxohlim) {
 721                                 int hlim = np->mcast_hops;
 722                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 723                         }
 724                 }
 725                 len -= msg.msg_controllen;
 726                 return put_user(len, optlen);
 727         }
 728         case IPV6_MTU:
 729         {
 730                 struct dst_entry *dst;
 731                 val = 0;
 732                 lock_sock(sk);
 733                 dst = sk_dst_get(sk);
 734                 if (dst) {
 735                         val = dst_mtu(dst);
 736                         dst_release(dst);
 737                 }
 738                 release_sock(sk);
 739                 if (!val)
 740                         return -ENOTCONN;
 741                 break;
 742         }
 743
 744         case IPV6_V6ONLY:
 745                 val = np->ipv6only;
 746                 break;
 747
 748         case IPV6_RECVPKTINFO:
 749                 val = np->rxopt.bits.rxinfo;
 750                 break;
 751
 752         case IPV6_2292PKTINFO:
 753                 val = np->rxopt.bits.rxoinfo;
 754                 break;
 755
 756         case IPV6_RECVHOPLIMIT:
 757                 val = np->rxopt.bits.rxhlim;
 758                 break;
 759
 760         case IPV6_2292HOPLIMIT:
 761                 val = np->rxopt.bits.rxohlim;
 762                 break;
 763
 764         case IPV6_RECVRTHDR:
 765                 val = np->rxopt.bits.srcrt;
 766                 break;
 767
 768         case IPV6_2292RTHDR:
 769                 val = np->rxopt.bits.osrcrt;
 770                 break;
 771
 772         case IPV6_HOPOPTS:
 773         case IPV6_RTHDRDSTOPTS:
 774         case IPV6_RTHDR:
 775         case IPV6_DSTOPTS:
 776         {
 777
 778                 lock_sock(sk);
 779                 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
 780                                              optval, len);
 781                 release_sock(sk);
 782                 return put_user(len, optlen);
 783         }
 784
 785         case IPV6_RECVHOPOPTS:
 786                 val = np->rxopt.bits.hopopts;
 787                 break;
 788
 789         case IPV6_2292HOPOPTS:
 790                 val = np->rxopt.bits.ohopopts;
 791                 break;
 792
 793         case IPV6_RECVDSTOPTS:
 794                 val = np->rxopt.bits.dstopts;
 795                 break;
 796
 797         case IPV6_2292DSTOPTS:
 798                 val = np->rxopt.bits.odstopts;
 799                 break;
 800
 801         case IPV6_TCLASS:
 802                 val = np->tclass;
 803                 break;
 804
 805         case IPV6_RECVTCLASS:
 806                 val = np->rxopt.bits.rxtclass;
 807                 break;
 808
 809         case IPV6_FLOWINFO:
 810                 val = np->rxopt.bits.rxflow;
 811                 break;
 812
 813         case IPV6_UNICAST_HOPS:
 814                 val = np->hop_limit;
 815                 break;
 816
 817         case IPV6_MULTICAST_HOPS:
 818                 val = np->mcast_hops;
 819                 break;
 820
 821         case IPV6_MULTICAST_LOOP:
 822                 val = np->mc_loop;
 823                 break;
 824
 825         case IPV6_MULTICAST_IF:
 826                 val = np->mcast_oif;
 827                 break;
 828
 829         case IPV6_MTU_DISCOVER:
 830                 val = np->pmtudisc;
 831                 break;
 832
 833         case IPV6_RECVERR:
 834                 val = np->recverr;
 835                 break;
 836
 837         case IPV6_FLOWINFO_SEND:
 838                 val = np->sndflow;
 839                 break;
 840
 841         default:
 842 #ifdef CONFIG_NETFILTER
 843                 lock_sock(sk);
 844                 val = nf_getsockopt(sk, PF_INET6, optname, optval,
 845                                     &len);
 846                 release_sock(sk);
 847                 if (val >= 0)
 848                         val = put_user(len, optlen);
 849                 return val;
 850 #else
 851                 return -EINVAL;
 852 #endif
 853         }
 854         len = min_t(unsigned int, sizeof(int), len);
 855         if(put_user(len, optlen))
 856                 return -EFAULT;
 857         if(copy_to_user(optval,&val,len))
 858                 return -EFAULT;
 859         return 0;
 860 }
 861
 862 void __init ipv6_packet_init(void)
 863 {
 864         dev_add_pack(&ipv6_packet_type);
 865 }
 866
 867 void ipv6_packet_cleanup(void)
 868 {
 869         dev_remove_pack(&ipv6_packet_type);
 870 }