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  *      $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  *      FIXME: Make the setsockopt code POSIX compliant: That is
  18  *
  19  *      o       Return -EINVAL for setsockopt of short lengths
  20  *      o       Truncate getsockopt returns
  21  *      o       Return an optlen of the truncated length if need be
  22  *
  23  *      Changes:
  24  *      David L Stevens <dlstevens@us.ibm.com>:
  25  *              - added multicast source filtering API for MLDv2
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/capability.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/socket.h>
  33 #include <linux/sockios.h>
  34 #include <linux/net.h>
  35 #include <linux/in6.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/if_arp.h>
  38 #include <linux/init.h>
  39 #include <linux/sysctl.h>
  40 #include <linux/netfilter.h>
  41
  42 #include <net/sock.h>
  43 #include <net/snmp.h>
  44 #include <net/ipv6.h>
  45 #include <net/ndisc.h>
  46 #include <net/protocol.h>
  47 #include <net/transp_v6.h>
  48 #include <net/ip6_route.h>
  49 #include <net/addrconf.h>
  50 #include <net/inet_common.h>
  51 #include <net/tcp.h>
  52 #include <net/udp.h>
  53 #include <net/udplite.h>
  54 #include <net/xfrm.h>
  55
  56 #include <asm/uaccess.h>
  57
  58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  59
  60 struct ip6_ra_chain *ip6_ra_chain;
  61 DEFINE_RWLOCK(ip6_ra_lock);
  62
  63 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
  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)->num != IPPROTO_RAW)
  69                 return -EINVAL;
  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                         if (ra->destructor)
  86                                 ra->destructor(sk);
  87                         sock_put(sk);
  88                         kfree(ra);
  89                         return 0;
  90                 }
  91         }
  92         if (new_ra == NULL) {
  93                 write_unlock_bh(&ip6_ra_lock);
  94                 return -ENOBUFS;
  95         }
  96         new_ra->sk = sk;
  97         new_ra->sel = sel;
  98         new_ra->destructor = destructor;
  99         new_ra->next = ra;
 100         *rap = new_ra;
 101         sock_hold(sk);
 102         write_unlock_bh(&ip6_ra_lock);
 103         return 0;
 104 }
 105
 106 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 107                     char __user *optval, int optlen)
 108 {
 109         struct ipv6_pinfo *np = inet6_sk(sk);
 110         struct net *net = sock_net(sk);
 111         int val, valbool;
 112         int retv = -ENOPROTOOPT;
 113
 114         if (optval == NULL)
 115                 val=0;
 116         else if (get_user(val, (int __user *) optval))
 117                 return -EFAULT;
 118
 119         valbool = (val!=0);
 120
 121         lock_sock(sk);
 122
 123         switch (optname) {
 124
 125         case IPV6_ADDRFORM:
 126                 if (val == PF_INET) {
 127                         struct ipv6_txoptions *opt;
 128                         struct sk_buff *pktopt;
 129
 130                         if (sk->sk_protocol != IPPROTO_UDP &&
 131                             sk->sk_protocol != IPPROTO_UDPLITE &&
 132                             sk->sk_protocol != IPPROTO_TCP)
 133                                 break;
 134
 135                         if (sk->sk_state != TCP_ESTABLISHED) {
 136                                 retv = -ENOTCONN;
 137                                 break;
 138                         }
 139
 140                         if (ipv6_only_sock(sk) ||
 141                             !ipv6_addr_v4mapped(&np->daddr)) {
 142                                 retv = -EADDRNOTAVAIL;
 143                                 break;
 144                         }
 145
 146                         fl6_free_socklist(sk);
 147                         ipv6_sock_mc_close(sk);
 148
 149                         /*
 150                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 151                          * remove it from the refcnt debug socks count in the
 152                          * original family...
 153                          */
 154                         sk_refcnt_debug_dec(sk);
 155
 156                         if (sk->sk_protocol == IPPROTO_TCP) {
 157                                 struct inet_connection_sock *icsk = inet_csk(sk);
 158                                 struct net *net = sock_net(sk);
 159
 160                                 local_bh_disable();
 161                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 162                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 163                                 local_bh_enable();
 164                                 sk->sk_prot = &tcp_prot;
 165                                 icsk->icsk_af_ops = &ipv4_specific;
 166                                 sk->sk_socket->ops = &inet_stream_ops;
 167                                 sk->sk_family = PF_INET;
 168                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 169                         } else {
 170                                 struct proto *prot = &udp_prot;
 171                                 struct net *net = sock_net(sk);
 172
 173                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 174                                         prot = &udplite_prot;
 175                                 local_bh_disable();
 176                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 177                                 sock_prot_inuse_add(net, prot, 1);
 178                                 local_bh_enable();
 179                                 sk->sk_prot = prot;
 180                                 sk->sk_socket->ops = &inet_dgram_ops;
 181                                 sk->sk_family = PF_INET;
 182                         }
 183                         opt = xchg(&np->opt, NULL);
 184                         if (opt)
 185                                 sock_kfree_s(sk, opt, opt->tot_len);
 186                         pktopt = xchg(&np->pktoptions, NULL);
 187                         if (pktopt)
 188                                 kfree_skb(pktopt);
 189
 190                         sk->sk_destruct = inet_sock_destruct;
 191                         /*
 192                          * ... and add it to the refcnt debug socks count
 193                          * in the new family. -acme
 194                          */
 195                         sk_refcnt_debug_inc(sk);
 196                         module_put(THIS_MODULE);
 197                         retv = 0;
 198                         break;
 199                 }
 200                 goto e_inval;
 201
 202         case IPV6_V6ONLY:
 203                 if (inet_sk(sk)->num)
 204                         goto e_inval;
 205                 np->ipv6only = valbool;
 206                 retv = 0;
 207                 break;
 208
 209         case IPV6_RECVPKTINFO:
 210                 np->rxopt.bits.rxinfo = valbool;
 211                 retv = 0;
 212                 break;
 213
 214         case IPV6_2292PKTINFO:
 215                 np->rxopt.bits.rxoinfo = valbool;
 216                 retv = 0;
 217                 break;
 218
 219         case IPV6_RECVHOPLIMIT:
 220                 np->rxopt.bits.rxhlim = valbool;
 221                 retv = 0;
 222                 break;
 223
 224         case IPV6_2292HOPLIMIT:
 225                 np->rxopt.bits.rxohlim = valbool;
 226                 retv = 0;
 227                 break;
 228
 229         case IPV6_RECVRTHDR:
 230                 np->rxopt.bits.srcrt = valbool;
 231                 retv = 0;
 232                 break;
 233
 234         case IPV6_2292RTHDR:
 235                 np->rxopt.bits.osrcrt = valbool;
 236                 retv = 0;
 237                 break;
 238
 239         case IPV6_RECVHOPOPTS:
 240                 np->rxopt.bits.hopopts = valbool;
 241                 retv = 0;
 242                 break;
 243
 244         case IPV6_2292HOPOPTS:
 245                 np->rxopt.bits.ohopopts = valbool;
 246                 retv = 0;
 247                 break;
 248
 249         case IPV6_RECVDSTOPTS:
 250                 np->rxopt.bits.dstopts = valbool;
 251                 retv = 0;
 252                 break;
 253
 254         case IPV6_2292DSTOPTS:
 255                 np->rxopt.bits.odstopts = valbool;
 256                 retv = 0;
 257                 break;
 258
 259         case IPV6_TCLASS:
 260                 if (val < -1 || val > 0xff)
 261                         goto e_inval;
 262                 np->tclass = val;
 263                 retv = 0;
 264                 break;
 265
 266         case IPV6_RECVTCLASS:
 267                 np->rxopt.bits.rxtclass = valbool;
 268                 retv = 0;
 269                 break;
 270
 271         case IPV6_FLOWINFO:
 272                 np->rxopt.bits.rxflow = valbool;
 273                 retv = 0;
 274                 break;
 275
 276         case IPV6_HOPOPTS:
 277         case IPV6_RTHDRDSTOPTS:
 278         case IPV6_RTHDR:
 279         case IPV6_DSTOPTS:
 280         {
 281                 struct ipv6_txoptions *opt;
 282                 if (optlen == 0)
 283                         optval = NULL;
 284
 285                 /* hop-by-hop / destination options are privileged option */
 286                 retv = -EPERM;
 287                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 288                         break;
 289
 290                 retv = -EINVAL;
 291                 if (optlen & 0x7 || optlen > 8 * 255)
 292                         break;
 293
 294                 opt = ipv6_renew_options(sk, np->opt, optname,
 295                                          (struct ipv6_opt_hdr __user *)optval,
 296                                          optlen);
 297                 if (IS_ERR(opt)) {
 298                         retv = PTR_ERR(opt);
 299                         break;
 300                 }
 301
 302                 /* routing header option needs extra check */
 303                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 304                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 305                         switch (rthdr->type) {
 306 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 307                         case IPV6_SRCRT_TYPE_2:
 308                                 break;
 309 #endif
 310                         default:
 311                                 goto sticky_done;
 312                         }
 313
 314                         if ((rthdr->hdrlen & 1) ||
 315                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 316                                 goto sticky_done;
 317                 }
 318
 319                 retv = 0;
 320                 if (inet_sk(sk)->is_icsk) {
 321                         if (opt) {
 322                                 struct inet_connection_sock *icsk = inet_csk(sk);
 323                                 if (!((1 << sk->sk_state) &
 324                                       (TCPF_LISTEN | TCPF_CLOSE))
 325                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 326                                         icsk->icsk_ext_hdr_len =
 327                                                 opt->opt_flen + opt->opt_nflen;
 328                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 329                                 }
 330                         }
 331                         opt = xchg(&np->opt, opt);
 332                         sk_dst_reset(sk);
 333                 } else {
 334                         write_lock(&sk->sk_dst_lock);
 335                         opt = xchg(&np->opt, opt);
 336                         write_unlock(&sk->sk_dst_lock);
 337                         sk_dst_reset(sk);
 338                 }
 339 sticky_done:
 340                 if (opt)
 341                         sock_kfree_s(sk, opt, opt->tot_len);
 342                 break;
 343         }
 344
 345         case IPV6_2292PKTOPTIONS:
 346         {
 347                 struct ipv6_txoptions *opt = NULL;
 348                 struct msghdr msg;
 349                 struct flowi fl;
 350                 int junk;
 351
 352                 fl.fl6_flowlabel = 0;
 353                 fl.oif = sk->sk_bound_dev_if;
 354
 355                 if (optlen == 0)
 356                         goto update;
 357
 358                 /* 1K is probably excessive
 359                  * 1K is surely not enough, 2K per standard header is 16K.
 360                  */
 361                 retv = -EINVAL;
 362                 if (optlen > 64*1024)
 363                         break;
 364
 365                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 366                 retv = -ENOBUFS;
 367                 if (opt == NULL)
 368                         break;
 369
 370                 memset(opt, 0, sizeof(*opt));
 371                 opt->tot_len = sizeof(*opt) + optlen;
 372                 retv = -EFAULT;
 373                 if (copy_from_user(opt+1, optval, optlen))
 374                         goto done;
 375
 376                 msg.msg_controllen = optlen;
 377                 msg.msg_control = (void*)(opt+1);
 378
 379                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 380                 if (retv)
 381                         goto done;
 382 update:
 383                 retv = 0;
 384                 if (inet_sk(sk)->is_icsk) {
 385                         if (opt) {
 386                                 struct inet_connection_sock *icsk = inet_csk(sk);
 387                                 if (!((1 << sk->sk_state) &
 388                                       (TCPF_LISTEN | TCPF_CLOSE))
 389                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 390                                         icsk->icsk_ext_hdr_len =
 391                                                 opt->opt_flen + opt->opt_nflen;
 392                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 393                                 }
 394                         }
 395                         opt = xchg(&np->opt, opt);
 396                         sk_dst_reset(sk);
 397                 } else {
 398                         write_lock(&sk->sk_dst_lock);
 399                         opt = xchg(&np->opt, opt);
 400                         write_unlock(&sk->sk_dst_lock);
 401                         sk_dst_reset(sk);
 402                 }
 403
 404 done:
 405                 if (opt)
 406                         sock_kfree_s(sk, opt, opt->tot_len);
 407                 break;
 408         }
 409         case IPV6_UNICAST_HOPS:
 410                 if (val > 255 || val < -1)
 411                         goto e_inval;
 412                 np->hop_limit = val;
 413                 retv = 0;
 414                 break;
 415
 416         case IPV6_MULTICAST_HOPS:
 417                 if (sk->sk_type == SOCK_STREAM)
 418                         goto e_inval;
 419                 if (val > 255 || val < -1)
 420                         goto e_inval;
 421                 np->mcast_hops = val;
 422                 retv = 0;
 423                 break;
 424
 425         case IPV6_MULTICAST_LOOP:
 426                 np->mc_loop = valbool;
 427                 retv = 0;
 428                 break;
 429
 430         case IPV6_MULTICAST_IF:
 431                 if (sk->sk_type == SOCK_STREAM)
 432                         goto e_inval;
 433
 434                 if (val) {
 435                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 436                                 goto e_inval;
 437
 438                         if (__dev_get_by_index(net, val) == NULL) {
 439                                 retv = -ENODEV;
 440                                 break;
 441                         }
 442                 }
 443                 np->mcast_oif = val;
 444                 retv = 0;
 445                 break;
 446         case IPV6_ADD_MEMBERSHIP:
 447         case IPV6_DROP_MEMBERSHIP:
 448         {
 449                 struct ipv6_mreq mreq;
 450
 451                 retv = -EPROTO;
 452                 if (inet_sk(sk)->is_icsk)
 453                         break;
 454
 455                 retv = -EFAULT;
 456                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 457                         break;
 458
 459                 if (optname == IPV6_ADD_MEMBERSHIP)
 460                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 461                 else
 462                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 463                 break;
 464         }
 465         case IPV6_JOIN_ANYCAST:
 466         case IPV6_LEAVE_ANYCAST:
 467         {
 468                 struct ipv6_mreq mreq;
 469
 470                 if (optlen != sizeof(struct ipv6_mreq))
 471                         goto e_inval;
 472
 473                 retv = -EFAULT;
 474                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 475                         break;
 476
 477                 if (optname == IPV6_JOIN_ANYCAST)
 478                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 479                 else
 480                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 481                 break;
 482         }
 483         case MCAST_JOIN_GROUP:
 484         case MCAST_LEAVE_GROUP:
 485         {
 486                 struct group_req greq;
 487                 struct sockaddr_in6 *psin6;
 488
 489                 retv = -EFAULT;
 490                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 491                         break;
 492                 if (greq.gr_group.ss_family != AF_INET6) {
 493                         retv = -EADDRNOTAVAIL;
 494                         break;
 495                 }
 496                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 497                 if (optname == MCAST_JOIN_GROUP)
 498                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 499                                 &psin6->sin6_addr);
 500                 else
 501                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 502                                 &psin6->sin6_addr);
 503                 break;
 504         }
 505         case MCAST_JOIN_SOURCE_GROUP:
 506         case MCAST_LEAVE_SOURCE_GROUP:
 507         case MCAST_BLOCK_SOURCE:
 508         case MCAST_UNBLOCK_SOURCE:
 509         {
 510                 struct group_source_req greqs;
 511                 int omode, add;
 512
 513                 if (optlen != sizeof(struct group_source_req))
 514                         goto e_inval;
 515                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 516                         retv = -EFAULT;
 517                         break;
 518                 }
 519                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 520                     greqs.gsr_source.ss_family != AF_INET6) {
 521                         retv = -EADDRNOTAVAIL;
 522                         break;
 523                 }
 524                 if (optname == MCAST_BLOCK_SOURCE) {
 525                         omode = MCAST_EXCLUDE;
 526                         add = 1;
 527                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 528                         omode = MCAST_EXCLUDE;
 529                         add = 0;
 530                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 531                         struct sockaddr_in6 *psin6;
 532
 533                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 534                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 535                                 &psin6->sin6_addr);
 536                         /* prior join w/ different source is ok */
 537                         if (retv && retv != -EADDRINUSE)
 538                                 break;
 539                         omode = MCAST_INCLUDE;
 540                         add = 1;
 541                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 542                         omode = MCAST_INCLUDE;
 543                         add = 0;
 544                 }
 545                 retv = ip6_mc_source(add, omode, sk, &greqs);
 546                 break;
 547         }
 548         case MCAST_MSFILTER:
 549         {
 550                 extern int sysctl_mld_max_msf;
 551                 struct group_filter *gsf;
 552
 553                 if (optlen < GROUP_FILTER_SIZE(0))
 554                         goto e_inval;
 555                 if (optlen > sysctl_optmem_max) {
 556                         retv = -ENOBUFS;
 557                         break;
 558                 }
 559                 gsf = kmalloc(optlen,GFP_KERNEL);
 560                 if (!gsf) {
 561                         retv = -ENOBUFS;
 562                         break;
 563                 }
 564                 retv = -EFAULT;
 565                 if (copy_from_user(gsf, optval, optlen)) {
 566                         kfree(gsf);
 567                         break;
 568                 }
 569                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 570                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 571                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 572                         kfree(gsf);
 573                         retv = -ENOBUFS;
 574                         break;
 575                 }
 576                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 577                         kfree(gsf);
 578                         retv = -EINVAL;
 579                         break;
 580                 }
 581                 retv = ip6_mc_msfilter(sk, gsf);
 582                 kfree(gsf);
 583
 584                 break;
 585         }
 586         case IPV6_ROUTER_ALERT:
 587                 retv = ip6_ra_control(sk, val, NULL);
 588                 break;
 589         case IPV6_MTU_DISCOVER:
 590                 if (val<0 || val>3)
 591                         goto e_inval;
 592                 np->pmtudisc = val;
 593                 retv = 0;
 594                 break;
 595         case IPV6_MTU:
 596                 if (val && val < IPV6_MIN_MTU)
 597                         goto e_inval;
 598                 np->frag_size = val;
 599                 retv = 0;
 600                 break;
 601         case IPV6_RECVERR:
 602                 np->recverr = valbool;
 603                 if (!val)
 604                         skb_queue_purge(&sk->sk_error_queue);
 605                 retv = 0;
 606                 break;
 607         case IPV6_FLOWINFO_SEND:
 608                 np->sndflow = valbool;
 609                 retv = 0;
 610                 break;
 611         case IPV6_FLOWLABEL_MGR:
 612                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 613                 break;
 614         case IPV6_IPSEC_POLICY:
 615         case IPV6_XFRM_POLICY:
 616                 retv = -EPERM;
 617                 if (!capable(CAP_NET_ADMIN))
 618                         break;
 619                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 620                 break;
 621
 622         case IPV6_ADDR_PREFERENCES:
 623             {
 624                 unsigned int pref = 0;
 625                 unsigned int prefmask = ~0;
 626
 627                 retv = -EINVAL;
 628
 629                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 630                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 631                                IPV6_PREFER_SRC_TMP|
 632                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 633                 case IPV6_PREFER_SRC_PUBLIC:
 634                         pref |= IPV6_PREFER_SRC_PUBLIC;
 635                         break;
 636                 case IPV6_PREFER_SRC_TMP:
 637                         pref |= IPV6_PREFER_SRC_TMP;
 638                         break;
 639                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 640                         break;
 641                 case 0:
 642                         goto pref_skip_pubtmp;
 643                 default:
 644                         goto e_inval;
 645                 }
 646
 647                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 648                               IPV6_PREFER_SRC_TMP);
 649 pref_skip_pubtmp:
 650
 651                 /* check HOME/COA conflicts */
 652                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 653                 case IPV6_PREFER_SRC_HOME:
 654                         break;
 655                 case IPV6_PREFER_SRC_COA:
 656                         pref |= IPV6_PREFER_SRC_COA;
 657                 case 0:
 658                         goto pref_skip_coa;
 659                 default:
 660                         goto e_inval;
 661                 }
 662
 663                 prefmask &= ~IPV6_PREFER_SRC_COA;
 664 pref_skip_coa:
 665
 666                 /* check CGA/NONCGA conflicts */
 667                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 668                 case IPV6_PREFER_SRC_CGA:
 669                 case IPV6_PREFER_SRC_NONCGA:
 670                 case 0:
 671                         break;
 672                 default:
 673                         goto e_inval;
 674                 }
 675
 676                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 677                 retv = 0;
 678
 679                 break;
 680             }
 681         }
 682
 683         release_sock(sk);
 684
 685         return retv;
 686
 687 e_inval:
 688         release_sock(sk);
 689         return -EINVAL;
 690 }
 691
 692 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 693                     char __user *optval, int optlen)
 694 {
 695         int err;
 696
 697         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 698                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 699
 700         if (level != SOL_IPV6)
 701                 return -ENOPROTOOPT;
 702
 703         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 704 #ifdef CONFIG_NETFILTER
 705         /* we need to exclude all possible ENOPROTOOPTs except default case */
 706         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 707                         optname != IPV6_XFRM_POLICY) {
 708                 lock_sock(sk);
 709                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 710                                 optlen);
 711                 release_sock(sk);
 712         }
 713 #endif
 714         return err;
 715 }
 716
 717 EXPORT_SYMBOL(ipv6_setsockopt);
 718
 719 #ifdef CONFIG_COMPAT
 720 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 721                            char __user *optval, int optlen)
 722 {
 723         int err;
 724
 725         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 726                 if (udp_prot.compat_setsockopt != NULL)
 727                         return udp_prot.compat_setsockopt(sk, level, optname,
 728                                                           optval, optlen);
 729                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 730         }
 731
 732         if (level != SOL_IPV6)
 733                 return -ENOPROTOOPT;
 734
 735         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 736 #ifdef CONFIG_NETFILTER
 737         /* we need to exclude all possible ENOPROTOOPTs except default case */
 738         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 739             optname != IPV6_XFRM_POLICY) {
 740                 lock_sock(sk);
 741                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 742                                            optval, optlen);
 743                 release_sock(sk);
 744         }
 745 #endif
 746         return err;
 747 }
 748
 749 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 750 #endif
 751
 752 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 753                                   int optname, char __user *optval, int len)
 754 {
 755         struct ipv6_opt_hdr *hdr;
 756
 757         if (!opt)
 758                 return 0;
 759
 760         switch(optname) {
 761         case IPV6_HOPOPTS:
 762                 hdr = opt->hopopt;
 763                 break;
 764         case IPV6_RTHDRDSTOPTS:
 765                 hdr = opt->dst0opt;
 766                 break;
 767         case IPV6_RTHDR:
 768                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 769                 break;
 770         case IPV6_DSTOPTS:
 771                 hdr = opt->dst1opt;
 772                 break;
 773         default:
 774                 return -EINVAL; /* should not happen */
 775         }
 776
 777         if (!hdr)
 778                 return 0;
 779
 780         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 781         if (copy_to_user(optval, hdr, len))
 782                 return -EFAULT;
 783         return ipv6_optlen(hdr);
 784 }
 785
 786 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 787                     char __user *optval, int __user *optlen)
 788 {
 789         struct ipv6_pinfo *np = inet6_sk(sk);
 790         int len;
 791         int val;
 792
 793         if (get_user(len, optlen))
 794                 return -EFAULT;
 795         switch (optname) {
 796         case IPV6_ADDRFORM:
 797                 if (sk->sk_protocol != IPPROTO_UDP &&
 798                     sk->sk_protocol != IPPROTO_UDPLITE &&
 799                     sk->sk_protocol != IPPROTO_TCP)
 800                         return -EINVAL;
 801                 if (sk->sk_state != TCP_ESTABLISHED)
 802                         return -ENOTCONN;
 803                 val = sk->sk_family;
 804                 break;
 805         case MCAST_MSFILTER:
 806         {
 807                 struct group_filter gsf;
 808                 int err;
 809
 810                 if (len < GROUP_FILTER_SIZE(0))
 811                         return -EINVAL;
 812                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 813                         return -EFAULT;
 814                 lock_sock(sk);
 815                 err = ip6_mc_msfget(sk, &gsf,
 816                         (struct group_filter __user *)optval, optlen);
 817                 release_sock(sk);
 818                 return err;
 819         }
 820
 821         case IPV6_2292PKTOPTIONS:
 822         {
 823                 struct msghdr msg;
 824                 struct sk_buff *skb;
 825
 826                 if (sk->sk_type != SOCK_STREAM)
 827                         return -ENOPROTOOPT;
 828
 829                 msg.msg_control = optval;
 830                 msg.msg_controllen = len;
 831                 msg.msg_flags = 0;
 832
 833                 lock_sock(sk);
 834                 skb = np->pktoptions;
 835                 if (skb)
 836                         atomic_inc(&skb->users);
 837                 release_sock(sk);
 838
 839                 if (skb) {
 840                         int err = datagram_recv_ctl(sk, &msg, skb);
 841                         kfree_skb(skb);
 842                         if (err)
 843                                 return err;
 844                 } else {
 845                         if (np->rxopt.bits.rxinfo) {
 846                                 struct in6_pktinfo src_info;
 847                                 src_info.ipi6_ifindex = np->mcast_oif;
 848                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 849                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 850                         }
 851                         if (np->rxopt.bits.rxhlim) {
 852                                 int hlim = np->mcast_hops;
 853                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 854                         }
 855                         if (np->rxopt.bits.rxoinfo) {
 856                                 struct in6_pktinfo src_info;
 857                                 src_info.ipi6_ifindex = np->mcast_oif;
 858                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 859                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 860                         }
 861                         if (np->rxopt.bits.rxohlim) {
 862                                 int hlim = np->mcast_hops;
 863                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 864                         }
 865                 }
 866                 len -= msg.msg_controllen;
 867                 return put_user(len, optlen);
 868         }
 869         case IPV6_MTU:
 870         {
 871                 struct dst_entry *dst;
 872                 val = 0;
 873                 lock_sock(sk);
 874                 dst = sk_dst_get(sk);
 875                 if (dst) {
 876                         val = dst_mtu(dst);
 877                         dst_release(dst);
 878                 }
 879                 release_sock(sk);
 880                 if (!val)
 881                         return -ENOTCONN;
 882                 break;
 883         }
 884
 885         case IPV6_V6ONLY:
 886                 val = np->ipv6only;
 887                 break;
 888
 889         case IPV6_RECVPKTINFO:
 890                 val = np->rxopt.bits.rxinfo;
 891                 break;
 892
 893         case IPV6_2292PKTINFO:
 894                 val = np->rxopt.bits.rxoinfo;
 895                 break;
 896
 897         case IPV6_RECVHOPLIMIT:
 898                 val = np->rxopt.bits.rxhlim;
 899                 break;
 900
 901         case IPV6_2292HOPLIMIT:
 902                 val = np->rxopt.bits.rxohlim;
 903                 break;
 904
 905         case IPV6_RECVRTHDR:
 906                 val = np->rxopt.bits.srcrt;
 907                 break;
 908
 909         case IPV6_2292RTHDR:
 910                 val = np->rxopt.bits.osrcrt;
 911                 break;
 912
 913         case IPV6_HOPOPTS:
 914         case IPV6_RTHDRDSTOPTS:
 915         case IPV6_RTHDR:
 916         case IPV6_DSTOPTS:
 917         {
 918
 919                 lock_sock(sk);
 920                 len = ipv6_getsockopt_sticky(sk, np->opt,
 921                                              optname, optval, len);
 922                 release_sock(sk);
 923                 return put_user(len, optlen);
 924         }
 925
 926         case IPV6_RECVHOPOPTS:
 927                 val = np->rxopt.bits.hopopts;
 928                 break;
 929
 930         case IPV6_2292HOPOPTS:
 931                 val = np->rxopt.bits.ohopopts;
 932                 break;
 933
 934         case IPV6_RECVDSTOPTS:
 935                 val = np->rxopt.bits.dstopts;
 936                 break;
 937
 938         case IPV6_2292DSTOPTS:
 939                 val = np->rxopt.bits.odstopts;
 940                 break;
 941
 942         case IPV6_TCLASS:
 943                 val = np->tclass;
 944                 if (val < 0)
 945                         val = 0;
 946                 break;
 947
 948         case IPV6_RECVTCLASS:
 949                 val = np->rxopt.bits.rxtclass;
 950                 break;
 951
 952         case IPV6_FLOWINFO:
 953                 val = np->rxopt.bits.rxflow;
 954                 break;
 955
 956         case IPV6_UNICAST_HOPS:
 957         case IPV6_MULTICAST_HOPS:
 958         {
 959                 struct dst_entry *dst;
 960
 961                 if (optname == IPV6_UNICAST_HOPS)
 962                         val = np->hop_limit;
 963                 else
 964                         val = np->mcast_hops;
 965
 966                 dst = sk_dst_get(sk);
 967                 if (dst) {
 968                         if (val < 0)
 969                                 val = ip6_dst_hoplimit(dst);
 970                         dst_release(dst);
 971                 }
 972                 if (val < 0)
 973                         val = ipv6_devconf.hop_limit;
 974                 break;
 975         }
 976
 977         case IPV6_MULTICAST_LOOP:
 978                 val = np->mc_loop;
 979                 break;
 980
 981         case IPV6_MULTICAST_IF:
 982                 val = np->mcast_oif;
 983                 break;
 984
 985         case IPV6_MTU_DISCOVER:
 986                 val = np->pmtudisc;
 987                 break;
 988
 989         case IPV6_RECVERR:
 990                 val = np->recverr;
 991                 break;
 992
 993         case IPV6_FLOWINFO_SEND:
 994                 val = np->sndflow;
 995                 break;
 996
 997         case IPV6_ADDR_PREFERENCES:
 998                 val = 0;
 999
1000                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1001                         val |= IPV6_PREFER_SRC_TMP;
1002                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1003                         val |= IPV6_PREFER_SRC_PUBLIC;
1004                 else {
1005                         /* XXX: should we return system default? */
1006                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1007                 }
1008
1009                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1010                         val |= IPV6_PREFER_SRC_COA;
1011                 else
1012                         val |= IPV6_PREFER_SRC_HOME;
1013                 break;
1014
1015         default:
1016                 return -ENOPROTOOPT;
1017         }
1018         len = min_t(unsigned int, sizeof(int), len);
1019         if(put_user(len, optlen))
1020                 return -EFAULT;
1021         if(copy_to_user(optval,&val,len))
1022                 return -EFAULT;
1023         return 0;
1024 }
1025
1026 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1027                     char __user *optval, int __user *optlen)
1028 {
1029         int err;
1030
1031         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1032                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1033
1034         if(level != SOL_IPV6)
1035                 return -ENOPROTOOPT;
1036
1037         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1038 #ifdef CONFIG_NETFILTER
1039         /* we need to exclude all possible ENOPROTOOPTs except default case */
1040         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1041                 int len;
1042
1043                 if (get_user(len, optlen))
1044                         return -EFAULT;
1045
1046                 lock_sock(sk);
1047                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1048                                 &len);
1049                 release_sock(sk);
1050                 if (err >= 0)
1051                         err = put_user(len, optlen);
1052         }
1053 #endif
1054         return err;
1055 }
1056
1057 EXPORT_SYMBOL(ipv6_getsockopt);
1058
1059 #ifdef CONFIG_COMPAT
1060 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1061                            char __user *optval, int __user *optlen)
1062 {
1063         int err;
1064
1065         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1066                 if (udp_prot.compat_getsockopt != NULL)
1067                         return udp_prot.compat_getsockopt(sk, level, optname,
1068                                                           optval, optlen);
1069                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1070         }
1071
1072         if (level != SOL_IPV6)
1073                 return -ENOPROTOOPT;
1074
1075         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1076 #ifdef CONFIG_NETFILTER
1077         /* we need to exclude all possible ENOPROTOOPTs except default case */
1078         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1079                 int len;
1080
1081                 if (get_user(len, optlen))
1082                         return -EFAULT;
1083
1084                 lock_sock(sk);
1085                 err = compat_nf_getsockopt(sk, PF_INET6,
1086                                            optname, optval, &len);
1087                 release_sock(sk);
1088                 if (err >= 0)
1089                         err = put_user(len, optlen);
1090         }
1091 #endif
1092         return err;
1093 }
1094
1095 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1096 #endif
1097