SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  *
  15  *      FIXME: Make the setsockopt code POSIX compliant: That is
  16  *
  17  *      o       Truncate getsockopt returns
  18  *      o       Return an optlen of the truncated length if need be
  19  *
  20  *      Changes:
  21  *      David L Stevens <dlstevens@us.ibm.com>:
  22  *              - added multicast source filtering API for MLDv2
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/capability.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/socket.h>
  30 #include <linux/sockios.h>
  31 #include <linux/net.h>
  32 #include <linux/in6.h>
  33 #include <linux/mroute6.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/init.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/netfilter.h>
  39 #include <linux/slab.h>
  40
  41 #include <net/sock.h>
  42 #include <net/snmp.h>
  43 #include <net/ipv6.h>
  44 #include <net/ndisc.h>
  45 #include <net/protocol.h>
  46 #include <net/transp_v6.h>
  47 #include <net/ip6_route.h>
  48 #include <net/addrconf.h>
  49 #include <net/inet_common.h>
  50 #include <net/tcp.h>
  51 #include <net/udp.h>
  52 #include <net/udplite.h>
  53 #include <net/xfrm.h>
  54 #include <net/compat.h>
  55
  56 #include <asm/uaccess.h>
  57
  58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  59
  60 struct ip6_ra_chain *ip6_ra_chain;
  61 DEFINE_RWLOCK(ip6_ra_lock);
  62
  63 int ip6_ra_control(struct sock *sk, int sel)
  64 {
  65         struct ip6_ra_chain *ra, *new_ra, **rap;
  66
  67         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  68         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  69                 return -ENOPROTOOPT;
  70
  71         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  72
  73         write_lock_bh(&ip6_ra_lock);
  74         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  75                 if (ra->sk == sk) {
  76                         if (sel>=0) {
  77                                 write_unlock_bh(&ip6_ra_lock);
  78                                 kfree(new_ra);
  79                                 return -EADDRINUSE;
  80                         }
  81
  82                         *rap = ra->next;
  83                         write_unlock_bh(&ip6_ra_lock);
  84
  85                         sock_put(sk);
  86                         kfree(ra);
  87                         return 0;
  88                 }
  89         }
  90         if (new_ra == NULL) {
  91                 write_unlock_bh(&ip6_ra_lock);
  92                 return -ENOBUFS;
  93         }
  94         new_ra->sk = sk;
  95         new_ra->sel = sel;
  96         new_ra->next = ra;
  97         *rap = new_ra;
  98         sock_hold(sk);
  99         write_unlock_bh(&ip6_ra_lock);
 100         return 0;
 101 }
 102
 103 static
 104 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 105                                            struct ipv6_txoptions *opt)
 106 {
 107         if (inet_sk(sk)->is_icsk) {
 108                 if (opt &&
 109                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 110                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 111                         struct inet_connection_sock *icsk = inet_csk(sk);
 112                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 113                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 114                 }
 115                 opt = xchg(&inet6_sk(sk)->opt, opt);
 116         } else {
 117                 spin_lock(&sk->sk_dst_lock);
 118                 opt = xchg(&inet6_sk(sk)->opt, opt);
 119                 spin_unlock(&sk->sk_dst_lock);
 120         }
 121         sk_dst_reset(sk);
 122
 123         return opt;
 124 }
 125
 126 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 127                     char __user *optval, unsigned int optlen)
 128 {
 129         struct ipv6_pinfo *np = inet6_sk(sk);
 130         struct net *net = sock_net(sk);
 131         int val, valbool;
 132         int retv = -ENOPROTOOPT;
 133
 134         if (optval == NULL)
 135                 val=0;
 136         else {
 137                 if (optlen >= sizeof(int)) {
 138                         if (get_user(val, (int __user *) optval))
 139                                 return -EFAULT;
 140                 } else
 141                         val = 0;
 142         }
 143
 144         valbool = (val!=0);
 145
 146         if (ip6_mroute_opt(optname))
 147                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 148
 149         lock_sock(sk);
 150
 151         switch (optname) {
 152
 153         case IPV6_ADDRFORM:
 154                 if (optlen < sizeof(int))
 155                         goto e_inval;
 156                 if (val == PF_INET) {
 157                         struct ipv6_txoptions *opt;
 158                         struct sk_buff *pktopt;
 159
 160                         if (sk->sk_type == SOCK_RAW)
 161                                 break;
 162
 163                         if (sk->sk_protocol == IPPROTO_UDP ||
 164                             sk->sk_protocol == IPPROTO_UDPLITE) {
 165                                 struct udp_sock *up = udp_sk(sk);
 166                                 if (up->pending == AF_INET6) {
 167                                         retv = -EBUSY;
 168                                         break;
 169                                 }
 170                         } else if (sk->sk_protocol != IPPROTO_TCP)
 171                                 break;
 172
 173                         if (sk->sk_state != TCP_ESTABLISHED) {
 174                                 retv = -ENOTCONN;
 175                                 break;
 176                         }
 177
 178                         if (ipv6_only_sock(sk) ||
 179                             !ipv6_addr_v4mapped(&np->daddr)) {
 180                                 retv = -EADDRNOTAVAIL;
 181                                 break;
 182                         }
 183
 184                         fl6_free_socklist(sk);
 185                         ipv6_sock_mc_close(sk);
 186
 187                         /*
 188                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 189                          * remove it from the refcnt debug socks count in the
 190                          * original family...
 191                          */
 192                         sk_refcnt_debug_dec(sk);
 193
 194                         if (sk->sk_protocol == IPPROTO_TCP) {
 195                                 struct inet_connection_sock *icsk = inet_csk(sk);
 196                                 local_bh_disable();
 197                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 198                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 199                                 local_bh_enable();
 200                                 sk->sk_prot = &tcp_prot;
 201                                 icsk->icsk_af_ops = &ipv4_specific;
 202                                 sk->sk_socket->ops = &inet_stream_ops;
 203                                 sk->sk_family = PF_INET;
 204                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 205                         } else {
 206                                 struct proto *prot = &udp_prot;
 207
 208                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 209                                         prot = &udplite_prot;
 210                                 local_bh_disable();
 211                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 212                                 sock_prot_inuse_add(net, prot, 1);
 213                                 local_bh_enable();
 214                                 sk->sk_prot = prot;
 215                                 sk->sk_socket->ops = &inet_dgram_ops;
 216                                 sk->sk_family = PF_INET;
 217                         }
 218                         opt = xchg(&np->opt, NULL);
 219                         if (opt)
 220                                 sock_kfree_s(sk, opt, opt->tot_len);
 221                         pktopt = xchg(&np->pktoptions, NULL);
 222                         kfree_skb(pktopt);
 223
 224                         sk->sk_destruct = inet_sock_destruct;
 225                         /*
 226                          * ... and add it to the refcnt debug socks count
 227                          * in the new family. -acme
 228                          */
 229                         sk_refcnt_debug_inc(sk);
 230                         module_put(THIS_MODULE);
 231                         retv = 0;
 232                         break;
 233                 }
 234                 goto e_inval;
 235
 236         case IPV6_V6ONLY:
 237                 if (optlen < sizeof(int) ||
 238                     inet_sk(sk)->inet_num)
 239                         goto e_inval;
 240                 np->ipv6only = valbool;
 241                 retv = 0;
 242                 break;
 243
 244         case IPV6_RECVPKTINFO:
 245                 if (optlen < sizeof(int))
 246                         goto e_inval;
 247                 np->rxopt.bits.rxinfo = valbool;
 248                 retv = 0;
 249                 break;
 250
 251         case IPV6_2292PKTINFO:
 252                 if (optlen < sizeof(int))
 253                         goto e_inval;
 254                 np->rxopt.bits.rxoinfo = valbool;
 255                 retv = 0;
 256                 break;
 257
 258         case IPV6_RECVHOPLIMIT:
 259                 if (optlen < sizeof(int))
 260                         goto e_inval;
 261                 np->rxopt.bits.rxhlim = valbool;
 262                 retv = 0;
 263                 break;
 264
 265         case IPV6_2292HOPLIMIT:
 266                 if (optlen < sizeof(int))
 267                         goto e_inval;
 268                 np->rxopt.bits.rxohlim = valbool;
 269                 retv = 0;
 270                 break;
 271
 272         case IPV6_RECVRTHDR:
 273                 if (optlen < sizeof(int))
 274                         goto e_inval;
 275                 np->rxopt.bits.srcrt = valbool;
 276                 retv = 0;
 277                 break;
 278
 279         case IPV6_2292RTHDR:
 280                 if (optlen < sizeof(int))
 281                         goto e_inval;
 282                 np->rxopt.bits.osrcrt = valbool;
 283                 retv = 0;
 284                 break;
 285
 286         case IPV6_RECVHOPOPTS:
 287                 if (optlen < sizeof(int))
 288                         goto e_inval;
 289                 np->rxopt.bits.hopopts = valbool;
 290                 retv = 0;
 291                 break;
 292
 293         case IPV6_2292HOPOPTS:
 294                 if (optlen < sizeof(int))
 295                         goto e_inval;
 296                 np->rxopt.bits.ohopopts = valbool;
 297                 retv = 0;
 298                 break;
 299
 300         case IPV6_RECVDSTOPTS:
 301                 if (optlen < sizeof(int))
 302                         goto e_inval;
 303                 np->rxopt.bits.dstopts = valbool;
 304                 retv = 0;
 305                 break;
 306
 307         case IPV6_2292DSTOPTS:
 308                 if (optlen < sizeof(int))
 309                         goto e_inval;
 310                 np->rxopt.bits.odstopts = valbool;
 311                 retv = 0;
 312                 break;
 313
 314         case IPV6_TCLASS:
 315                 if (optlen < sizeof(int))
 316                         goto e_inval;
 317                 if (val < -1 || val > 0xff)
 318                         goto e_inval;
 319                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 320                 if (val == -1)
 321                         val = 0;
 322                 np->tclass = val;
 323                 retv = 0;
 324                 break;
 325
 326         case IPV6_RECVTCLASS:
 327                 if (optlen < sizeof(int))
 328                         goto e_inval;
 329                 np->rxopt.bits.rxtclass = valbool;
 330                 retv = 0;
 331                 break;
 332
 333         case IPV6_FLOWINFO:
 334                 if (optlen < sizeof(int))
 335                         goto e_inval;
 336                 np->rxopt.bits.rxflow = valbool;
 337                 retv = 0;
 338                 break;
 339
 340         case IPV6_RECVPATHMTU:
 341                 if (optlen < sizeof(int))
 342                         goto e_inval;
 343                 np->rxopt.bits.rxpmtu = valbool;
 344                 retv = 0;
 345                 break;
 346
 347         case IPV6_HOPOPTS:
 348         case IPV6_RTHDRDSTOPTS:
 349         case IPV6_RTHDR:
 350         case IPV6_DSTOPTS:
 351         {
 352                 struct ipv6_txoptions *opt;
 353
 354                 /* remove any sticky options header with a zero option
 355                  * length, per RFC3542.
 356                  */
 357                 if (optlen == 0)
 358                         optval = NULL;
 359                 else if (optval == NULL)
 360                         goto e_inval;
 361                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 362                          optlen & 0x7 || optlen > 8 * 255)
 363                         goto e_inval;
 364
 365                 /* hop-by-hop / destination options are privileged option */
 366                 retv = -EPERM;
 367                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 368                         break;
 369
 370                 opt = ipv6_renew_options(sk, np->opt, optname,
 371                                          (struct ipv6_opt_hdr __user *)optval,
 372                                          optlen);
 373                 if (IS_ERR(opt)) {
 374                         retv = PTR_ERR(opt);
 375                         break;
 376                 }
 377
 378                 /* routing header option needs extra check */
 379                 retv = -EINVAL;
 380                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 381                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 382                         switch (rthdr->type) {
 383 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 384                         case IPV6_SRCRT_TYPE_2:
 385                                 if (rthdr->hdrlen != 2 ||
 386                                     rthdr->segments_left != 1)
 387                                         goto sticky_done;
 388
 389                                 break;
 390 #endif
 391                         default:
 392                                 goto sticky_done;
 393                         }
 394                 }
 395
 396                 retv = 0;
 397                 opt = ipv6_update_options(sk, opt);
 398 sticky_done:
 399                 if (opt)
 400                         sock_kfree_s(sk, opt, opt->tot_len);
 401                 break;
 402         }
 403
 404         case IPV6_PKTINFO:
 405         {
 406                 struct in6_pktinfo pkt;
 407
 408                 if (optlen == 0)
 409                         goto e_inval;
 410                 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
 411                         goto e_inval;
 412
 413                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 414                                 retv = -EFAULT;
 415                                 break;
 416                 }
 417                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 418                         goto e_inval;
 419
 420                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 421                 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
 422                 retv = 0;
 423                 break;
 424         }
 425
 426         case IPV6_2292PKTOPTIONS:
 427         {
 428                 struct ipv6_txoptions *opt = NULL;
 429                 struct msghdr msg;
 430                 struct flowi fl;
 431                 int junk;
 432
 433                 fl.fl6_flowlabel = 0;
 434                 fl.oif = sk->sk_bound_dev_if;
 435                 fl.mark = sk->sk_mark;
 436
 437                 if (optlen == 0)
 438                         goto update;
 439
 440                 /* 1K is probably excessive
 441                  * 1K is surely not enough, 2K per standard header is 16K.
 442                  */
 443                 retv = -EINVAL;
 444                 if (optlen > 64*1024)
 445                         break;
 446
 447                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 448                 retv = -ENOBUFS;
 449                 if (opt == NULL)
 450                         break;
 451
 452                 memset(opt, 0, sizeof(*opt));
 453                 opt->tot_len = sizeof(*opt) + optlen;
 454                 retv = -EFAULT;
 455                 if (copy_from_user(opt+1, optval, optlen))
 456                         goto done;
 457
 458                 msg.msg_controllen = optlen;
 459                 msg.msg_control = (void*)(opt+1);
 460
 461                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk,
 462                                          &junk);
 463                 if (retv)
 464                         goto done;
 465 update:
 466                 retv = 0;
 467                 opt = ipv6_update_options(sk, opt);
 468 done:
 469                 if (opt)
 470                         sock_kfree_s(sk, opt, opt->tot_len);
 471                 break;
 472         }
 473         case IPV6_UNICAST_HOPS:
 474                 if (optlen < sizeof(int))
 475                         goto e_inval;
 476                 if (val > 255 || val < -1)
 477                         goto e_inval;
 478                 np->hop_limit = val;
 479                 retv = 0;
 480                 break;
 481
 482         case IPV6_MULTICAST_HOPS:
 483                 if (sk->sk_type == SOCK_STREAM)
 484                         break;
 485                 if (optlen < sizeof(int))
 486                         goto e_inval;
 487                 if (val > 255 || val < -1)
 488                         goto e_inval;
 489                 np->mcast_hops = val;
 490                 retv = 0;
 491                 break;
 492
 493         case IPV6_MULTICAST_LOOP:
 494                 if (optlen < sizeof(int))
 495                         goto e_inval;
 496                 if (val != valbool)
 497                         goto e_inval;
 498                 np->mc_loop = valbool;
 499                 retv = 0;
 500                 break;
 501
 502         case IPV6_MULTICAST_IF:
 503                 if (sk->sk_type == SOCK_STREAM)
 504                         break;
 505                 if (optlen < sizeof(int))
 506                         goto e_inval;
 507
 508                 if (val) {
 509                         struct net_device *dev;
 510
 511                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 512                                 goto e_inval;
 513
 514                         dev = dev_get_by_index(net, val);
 515                         if (!dev) {
 516                                 retv = -ENODEV;
 517                                 break;
 518                         }
 519                         dev_put(dev);
 520                 }
 521                 np->mcast_oif = val;
 522                 retv = 0;
 523                 break;
 524         case IPV6_ADD_MEMBERSHIP:
 525         case IPV6_DROP_MEMBERSHIP:
 526         {
 527                 struct ipv6_mreq mreq;
 528
 529                 if (optlen < sizeof(struct ipv6_mreq))
 530                         goto e_inval;
 531
 532                 retv = -EPROTO;
 533                 if (inet_sk(sk)->is_icsk)
 534                         break;
 535
 536                 retv = -EFAULT;
 537                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 538                         break;
 539
 540                 if (optname == IPV6_ADD_MEMBERSHIP)
 541                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 542                 else
 543                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 544                 break;
 545         }
 546         case IPV6_JOIN_ANYCAST:
 547         case IPV6_LEAVE_ANYCAST:
 548         {
 549                 struct ipv6_mreq mreq;
 550
 551                 if (optlen < sizeof(struct ipv6_mreq))
 552                         goto e_inval;
 553
 554                 retv = -EFAULT;
 555                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 556                         break;
 557
 558                 if (optname == IPV6_JOIN_ANYCAST)
 559                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 560                 else
 561                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 562                 break;
 563         }
 564         case MCAST_JOIN_GROUP:
 565         case MCAST_LEAVE_GROUP:
 566         {
 567                 struct group_req greq;
 568                 struct sockaddr_in6 *psin6;
 569
 570                 if (optlen < sizeof(struct group_req))
 571                         goto e_inval;
 572
 573                 retv = -EFAULT;
 574                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 575                         break;
 576                 if (greq.gr_group.ss_family != AF_INET6) {
 577                         retv = -EADDRNOTAVAIL;
 578                         break;
 579                 }
 580                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 581                 if (optname == MCAST_JOIN_GROUP)
 582                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 583                                 &psin6->sin6_addr);
 584                 else
 585                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 586                                 &psin6->sin6_addr);
 587                 break;
 588         }
 589         case MCAST_JOIN_SOURCE_GROUP:
 590         case MCAST_LEAVE_SOURCE_GROUP:
 591         case MCAST_BLOCK_SOURCE:
 592         case MCAST_UNBLOCK_SOURCE:
 593         {
 594                 struct group_source_req greqs;
 595                 int omode, add;
 596
 597                 if (optlen < sizeof(struct group_source_req))
 598                         goto e_inval;
 599                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 600                         retv = -EFAULT;
 601                         break;
 602                 }
 603                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 604                     greqs.gsr_source.ss_family != AF_INET6) {
 605                         retv = -EADDRNOTAVAIL;
 606                         break;
 607                 }
 608                 if (optname == MCAST_BLOCK_SOURCE) {
 609                         omode = MCAST_EXCLUDE;
 610                         add = 1;
 611                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 612                         omode = MCAST_EXCLUDE;
 613                         add = 0;
 614                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 615                         struct sockaddr_in6 *psin6;
 616
 617                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 618                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 619                                 &psin6->sin6_addr);
 620                         /* prior join w/ different source is ok */
 621                         if (retv && retv != -EADDRINUSE)
 622                                 break;
 623                         omode = MCAST_INCLUDE;
 624                         add = 1;
 625                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 626                         omode = MCAST_INCLUDE;
 627                         add = 0;
 628                 }
 629                 retv = ip6_mc_source(add, omode, sk, &greqs);
 630                 break;
 631         }
 632         case MCAST_MSFILTER:
 633         {
 634                 extern int sysctl_mld_max_msf;
 635                 struct group_filter *gsf;
 636
 637                 if (optlen < GROUP_FILTER_SIZE(0))
 638                         goto e_inval;
 639                 if (optlen > sysctl_optmem_max) {
 640                         retv = -ENOBUFS;
 641                         break;
 642                 }
 643                 gsf = kmalloc(optlen,GFP_KERNEL);
 644                 if (!gsf) {
 645                         retv = -ENOBUFS;
 646                         break;
 647                 }
 648                 retv = -EFAULT;
 649                 if (copy_from_user(gsf, optval, optlen)) {
 650                         kfree(gsf);
 651                         break;
 652                 }
 653                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 654                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 655                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 656                         kfree(gsf);
 657                         retv = -ENOBUFS;
 658                         break;
 659                 }
 660                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 661                         kfree(gsf);
 662                         retv = -EINVAL;
 663                         break;
 664                 }
 665                 retv = ip6_mc_msfilter(sk, gsf);
 666                 kfree(gsf);
 667
 668                 break;
 669         }
 670         case IPV6_ROUTER_ALERT:
 671                 if (optlen < sizeof(int))
 672                         goto e_inval;
 673                 retv = ip6_ra_control(sk, val);
 674                 break;
 675         case IPV6_MTU_DISCOVER:
 676                 if (optlen < sizeof(int))
 677                         goto e_inval;
 678                 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
 679                         goto e_inval;
 680                 np->pmtudisc = val;
 681                 retv = 0;
 682                 break;
 683         case IPV6_MTU:
 684                 if (optlen < sizeof(int))
 685                         goto e_inval;
 686                 if (val && val < IPV6_MIN_MTU)
 687                         goto e_inval;
 688                 np->frag_size = val;
 689                 retv = 0;
 690                 break;
 691         case IPV6_RECVERR:
 692                 if (optlen < sizeof(int))
 693                         goto e_inval;
 694                 np->recverr = valbool;
 695                 if (!val)
 696                         skb_queue_purge(&sk->sk_error_queue);
 697                 retv = 0;
 698                 break;
 699         case IPV6_FLOWINFO_SEND:
 700                 if (optlen < sizeof(int))
 701                         goto e_inval;
 702                 np->sndflow = valbool;
 703                 retv = 0;
 704                 break;
 705         case IPV6_FLOWLABEL_MGR:
 706                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 707                 break;
 708         case IPV6_IPSEC_POLICY:
 709         case IPV6_XFRM_POLICY:
 710                 retv = -EPERM;
 711                 if (!capable(CAP_NET_ADMIN))
 712                         break;
 713                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 714                 break;
 715
 716         case IPV6_ADDR_PREFERENCES:
 717             {
 718                 unsigned int pref = 0;
 719                 unsigned int prefmask = ~0;
 720
 721                 if (optlen < sizeof(int))
 722                         goto e_inval;
 723
 724                 retv = -EINVAL;
 725
 726                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 727                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 728                                IPV6_PREFER_SRC_TMP|
 729                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 730                 case IPV6_PREFER_SRC_PUBLIC:
 731                         pref |= IPV6_PREFER_SRC_PUBLIC;
 732                         break;
 733                 case IPV6_PREFER_SRC_TMP:
 734                         pref |= IPV6_PREFER_SRC_TMP;
 735                         break;
 736                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 737                         break;
 738                 case 0:
 739                         goto pref_skip_pubtmp;
 740                 default:
 741                         goto e_inval;
 742                 }
 743
 744                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 745                               IPV6_PREFER_SRC_TMP);
 746 pref_skip_pubtmp:
 747
 748                 /* check HOME/COA conflicts */
 749                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 750                 case IPV6_PREFER_SRC_HOME:
 751                         break;
 752                 case IPV6_PREFER_SRC_COA:
 753                         pref |= IPV6_PREFER_SRC_COA;
 754                 case 0:
 755                         goto pref_skip_coa;
 756                 default:
 757                         goto e_inval;
 758                 }
 759
 760                 prefmask &= ~IPV6_PREFER_SRC_COA;
 761 pref_skip_coa:
 762
 763                 /* check CGA/NONCGA conflicts */
 764                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 765                 case IPV6_PREFER_SRC_CGA:
 766                 case IPV6_PREFER_SRC_NONCGA:
 767                 case 0:
 768                         break;
 769                 default:
 770                         goto e_inval;
 771                 }
 772
 773                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 774                 retv = 0;
 775
 776                 break;
 777             }
 778         case IPV6_MINHOPCOUNT:
 779                 if (optlen < sizeof(int))
 780                         goto e_inval;
 781                 if (val < 0 || val > 255)
 782                         goto e_inval;
 783                 np->min_hopcount = val;
 784                 break;
 785         case IPV6_DONTFRAG:
 786                 np->dontfrag = valbool;
 787                 retv = 0;
 788                 break;
 789         }
 790
 791         release_sock(sk);
 792
 793         return retv;
 794
 795 e_inval:
 796         release_sock(sk);
 797         return -EINVAL;
 798 }
 799
 800 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 801                     char __user *optval, unsigned int optlen)
 802 {
 803         int err;
 804
 805         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 806                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 807
 808         if (level != SOL_IPV6)
 809                 return -ENOPROTOOPT;
 810
 811         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 812 #ifdef CONFIG_NETFILTER
 813         /* we need to exclude all possible ENOPROTOOPTs except default case */
 814         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 815                         optname != IPV6_XFRM_POLICY) {
 816                 lock_sock(sk);
 817                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 818                                 optlen);
 819                 release_sock(sk);
 820         }
 821 #endif
 822         return err;
 823 }
 824
 825 EXPORT_SYMBOL(ipv6_setsockopt);
 826
 827 #ifdef CONFIG_COMPAT
 828 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 829                            char __user *optval, unsigned int optlen)
 830 {
 831         int err;
 832
 833         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 834                 if (udp_prot.compat_setsockopt != NULL)
 835                         return udp_prot.compat_setsockopt(sk, level, optname,
 836                                                           optval, optlen);
 837                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 838         }
 839
 840         if (level != SOL_IPV6)
 841                 return -ENOPROTOOPT;
 842
 843         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 844                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 845                         ipv6_setsockopt);
 846
 847         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 848 #ifdef CONFIG_NETFILTER
 849         /* we need to exclude all possible ENOPROTOOPTs except default case */
 850         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 851             optname != IPV6_XFRM_POLICY) {
 852                 lock_sock(sk);
 853                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 854                                            optval, optlen);
 855                 release_sock(sk);
 856         }
 857 #endif
 858         return err;
 859 }
 860
 861 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 862 #endif
 863
 864 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 865                                   int optname, char __user *optval, int len)
 866 {
 867         struct ipv6_opt_hdr *hdr;
 868
 869         if (!opt)
 870                 return 0;
 871
 872         switch(optname) {
 873         case IPV6_HOPOPTS:
 874                 hdr = opt->hopopt;
 875                 break;
 876         case IPV6_RTHDRDSTOPTS:
 877                 hdr = opt->dst0opt;
 878                 break;
 879         case IPV6_RTHDR:
 880                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 881                 break;
 882         case IPV6_DSTOPTS:
 883                 hdr = opt->dst1opt;
 884                 break;
 885         default:
 886                 return -EINVAL; /* should not happen */
 887         }
 888
 889         if (!hdr)
 890                 return 0;
 891
 892         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 893         if (copy_to_user(optval, hdr, len))
 894                 return -EFAULT;
 895         return len;
 896 }
 897
 898 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 899                     char __user *optval, int __user *optlen)
 900 {
 901         struct ipv6_pinfo *np = inet6_sk(sk);
 902         int len;
 903         int val;
 904
 905         if (ip6_mroute_opt(optname))
 906                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 907
 908         if (get_user(len, optlen))
 909                 return -EFAULT;
 910         switch (optname) {
 911         case IPV6_ADDRFORM:
 912                 if (sk->sk_protocol != IPPROTO_UDP &&
 913                     sk->sk_protocol != IPPROTO_UDPLITE &&
 914                     sk->sk_protocol != IPPROTO_TCP)
 915                         return -ENOPROTOOPT;
 916                 if (sk->sk_state != TCP_ESTABLISHED)
 917                         return -ENOTCONN;
 918                 val = sk->sk_family;
 919                 break;
 920         case MCAST_MSFILTER:
 921         {
 922                 struct group_filter gsf;
 923                 int err;
 924
 925                 if (len < GROUP_FILTER_SIZE(0))
 926                         return -EINVAL;
 927                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 928                         return -EFAULT;
 929                 if (gsf.gf_group.ss_family != AF_INET6)
 930                         return -EADDRNOTAVAIL;
 931                 lock_sock(sk);
 932                 err = ip6_mc_msfget(sk, &gsf,
 933                         (struct group_filter __user *)optval, optlen);
 934                 release_sock(sk);
 935                 return err;
 936         }
 937
 938         case IPV6_2292PKTOPTIONS:
 939         {
 940                 struct msghdr msg;
 941                 struct sk_buff *skb;
 942
 943                 if (sk->sk_type != SOCK_STREAM)
 944                         return -ENOPROTOOPT;
 945
 946                 msg.msg_control = optval;
 947                 msg.msg_controllen = len;
 948                 msg.msg_flags = 0;
 949
 950                 lock_sock(sk);
 951                 skb = np->pktoptions;
 952                 if (skb)
 953                         atomic_inc(&skb->users);
 954                 release_sock(sk);
 955
 956                 if (skb) {
 957                         int err = datagram_recv_ctl(sk, &msg, skb);
 958                         kfree_skb(skb);
 959                         if (err)
 960                                 return err;
 961                 } else {
 962                         if (np->rxopt.bits.rxinfo) {
 963                                 struct in6_pktinfo src_info;
 964                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 965                                         np->sticky_pktinfo.ipi6_ifindex;
 966                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 967                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 968                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 969                         }
 970                         if (np->rxopt.bits.rxhlim) {
 971                                 int hlim = np->mcast_hops;
 972                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 973                         }
 974                         if (np->rxopt.bits.rxoinfo) {
 975                                 struct in6_pktinfo src_info;
 976                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 977                                         np->sticky_pktinfo.ipi6_ifindex;
 978                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 979                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 980                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 981                         }
 982                         if (np->rxopt.bits.rxohlim) {
 983                                 int hlim = np->mcast_hops;
 984                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 985                         }
 986                 }
 987                 len -= msg.msg_controllen;
 988                 return put_user(len, optlen);
 989         }
 990         case IPV6_MTU:
 991         {
 992                 struct dst_entry *dst;
 993
 994                 val = 0;
 995                 rcu_read_lock();
 996                 dst = __sk_dst_get(sk);
 997                 if (dst)
 998                         val = dst_mtu(dst);
 999                 rcu_read_unlock();
1000                 if (!val)
1001                         return -ENOTCONN;
1002                 break;
1003         }
1004
1005         case IPV6_V6ONLY:
1006                 val = np->ipv6only;
1007                 break;
1008
1009         case IPV6_RECVPKTINFO:
1010                 val = np->rxopt.bits.rxinfo;
1011                 break;
1012
1013         case IPV6_2292PKTINFO:
1014                 val = np->rxopt.bits.rxoinfo;
1015                 break;
1016
1017         case IPV6_RECVHOPLIMIT:
1018                 val = np->rxopt.bits.rxhlim;
1019                 break;
1020
1021         case IPV6_2292HOPLIMIT:
1022                 val = np->rxopt.bits.rxohlim;
1023                 break;
1024
1025         case IPV6_RECVRTHDR:
1026                 val = np->rxopt.bits.srcrt;
1027                 break;
1028
1029         case IPV6_2292RTHDR:
1030                 val = np->rxopt.bits.osrcrt;
1031                 break;
1032
1033         case IPV6_HOPOPTS:
1034         case IPV6_RTHDRDSTOPTS:
1035         case IPV6_RTHDR:
1036         case IPV6_DSTOPTS:
1037         {
1038
1039                 lock_sock(sk);
1040                 len = ipv6_getsockopt_sticky(sk, np->opt,
1041                                              optname, optval, len);
1042                 release_sock(sk);
1043                 /* check if ipv6_getsockopt_sticky() returns err code */
1044                 if (len < 0)
1045                         return len;
1046                 return put_user(len, optlen);
1047         }
1048
1049         case IPV6_RECVHOPOPTS:
1050                 val = np->rxopt.bits.hopopts;
1051                 break;
1052
1053         case IPV6_2292HOPOPTS:
1054                 val = np->rxopt.bits.ohopopts;
1055                 break;
1056
1057         case IPV6_RECVDSTOPTS:
1058                 val = np->rxopt.bits.dstopts;
1059                 break;
1060
1061         case IPV6_2292DSTOPTS:
1062                 val = np->rxopt.bits.odstopts;
1063                 break;
1064
1065         case IPV6_TCLASS:
1066                 val = np->tclass;
1067                 break;
1068
1069         case IPV6_RECVTCLASS:
1070                 val = np->rxopt.bits.rxtclass;
1071                 break;
1072
1073         case IPV6_FLOWINFO:
1074                 val = np->rxopt.bits.rxflow;
1075                 break;
1076
1077         case IPV6_RECVPATHMTU:
1078                 val = np->rxopt.bits.rxpmtu;
1079                 break;
1080
1081         case IPV6_PATHMTU:
1082         {
1083                 struct dst_entry *dst;
1084                 struct ip6_mtuinfo mtuinfo;
1085
1086                 if (len < sizeof(mtuinfo))
1087                         return -EINVAL;
1088
1089                 len = sizeof(mtuinfo);
1090                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1091
1092                 rcu_read_lock();
1093                 dst = __sk_dst_get(sk);
1094                 if (dst)
1095                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1096                 rcu_read_unlock();
1097                 if (!mtuinfo.ip6m_mtu)
1098                         return -ENOTCONN;
1099
1100                 if (put_user(len, optlen))
1101                         return -EFAULT;
1102                 if (copy_to_user(optval, &mtuinfo, len))
1103                         return -EFAULT;
1104
1105                 return 0;
1106                 break;
1107         }
1108
1109         case IPV6_UNICAST_HOPS:
1110         case IPV6_MULTICAST_HOPS:
1111         {
1112                 struct dst_entry *dst;
1113
1114                 if (optname == IPV6_UNICAST_HOPS)
1115                         val = np->hop_limit;
1116                 else
1117                         val = np->mcast_hops;
1118
1119                 if (val < 0) {
1120                         rcu_read_lock();
1121                         dst = __sk_dst_get(sk);
1122                         if (dst)
1123                                 val = ip6_dst_hoplimit(dst);
1124                         rcu_read_unlock();
1125                 }
1126
1127                 if (val < 0)
1128                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1129                 break;
1130         }
1131
1132         case IPV6_MULTICAST_LOOP:
1133                 val = np->mc_loop;
1134                 break;
1135
1136         case IPV6_MULTICAST_IF:
1137                 val = np->mcast_oif;
1138                 break;
1139
1140         case IPV6_MTU_DISCOVER:
1141                 val = np->pmtudisc;
1142                 break;
1143
1144         case IPV6_RECVERR:
1145                 val = np->recverr;
1146                 break;
1147
1148         case IPV6_FLOWINFO_SEND:
1149                 val = np->sndflow;
1150                 break;
1151
1152         case IPV6_ADDR_PREFERENCES:
1153                 val = 0;
1154
1155                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1156                         val |= IPV6_PREFER_SRC_TMP;
1157                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1158                         val |= IPV6_PREFER_SRC_PUBLIC;
1159                 else {
1160                         /* XXX: should we return system default? */
1161                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1162                 }
1163
1164                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1165                         val |= IPV6_PREFER_SRC_COA;
1166                 else
1167                         val |= IPV6_PREFER_SRC_HOME;
1168                 break;
1169
1170         case IPV6_MINHOPCOUNT:
1171                 val = np->min_hopcount;
1172                 break;
1173
1174         case IPV6_DONTFRAG:
1175                 val = np->dontfrag;
1176                 break;
1177
1178         default:
1179                 return -ENOPROTOOPT;
1180         }
1181         len = min_t(unsigned int, sizeof(int), len);
1182         if(put_user(len, optlen))
1183                 return -EFAULT;
1184         if(copy_to_user(optval,&val,len))
1185                 return -EFAULT;
1186         return 0;
1187 }
1188
1189 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1190                     char __user *optval, int __user *optlen)
1191 {
1192         int err;
1193
1194         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1195                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1196
1197         if(level != SOL_IPV6)
1198                 return -ENOPROTOOPT;
1199
1200         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1201 #ifdef CONFIG_NETFILTER
1202         /* we need to exclude all possible ENOPROTOOPTs except default case */
1203         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1204                 int len;
1205
1206                 if (get_user(len, optlen))
1207                         return -EFAULT;
1208
1209                 lock_sock(sk);
1210                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1211                                 &len);
1212                 release_sock(sk);
1213                 if (err >= 0)
1214                         err = put_user(len, optlen);
1215         }
1216 #endif
1217         return err;
1218 }
1219
1220 EXPORT_SYMBOL(ipv6_getsockopt);
1221
1222 #ifdef CONFIG_COMPAT
1223 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1224                            char __user *optval, int __user *optlen)
1225 {
1226         int err;
1227
1228         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1229                 if (udp_prot.compat_getsockopt != NULL)
1230                         return udp_prot.compat_getsockopt(sk, level, optname,
1231                                                           optval, optlen);
1232                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1233         }
1234
1235         if (level != SOL_IPV6)
1236                 return -ENOPROTOOPT;
1237
1238         if (optname == MCAST_MSFILTER)
1239                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1240                         ipv6_getsockopt);
1241
1242         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1243 #ifdef CONFIG_NETFILTER
1244         /* we need to exclude all possible ENOPROTOOPTs except default case */
1245         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1246                 int len;
1247
1248                 if (get_user(len, optlen))
1249                         return -EFAULT;
1250
1251                 lock_sock(sk);
1252                 err = compat_nf_getsockopt(sk, PF_INET6,
1253                                            optname, optval, &len);
1254                 release_sock(sk);
1255                 if (err >= 0)
1256                         err = put_user(len, optlen);
1257         }
1258 #endif
1259         return err;
1260 }
1261
1262 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1263 #endif
1264