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