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       Truncate getsockopt returns
  20  *      o       Return an optlen of the truncated length if need be
  21  *
  22  *      Changes:
  23  *      David L Stevens <dlstevens@us.ibm.com>:
  24  *              - added multicast source filtering API for MLDv2
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/capability.h>
  29 #include <linux/errno.h>
  30 #include <linux/types.h>
  31 #include <linux/socket.h>
  32 #include <linux/sockios.h>
  33 #include <linux/net.h>
  34 #include <linux/in6.h>
  35 #include <linux/mroute6.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 #include <net/compat.h>
  56
  57 #include <asm/uaccess.h>
  58
  59 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  60
  61 struct ip6_ra_chain *ip6_ra_chain;
  62 DEFINE_RWLOCK(ip6_ra_lock);
  63
  64 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
  65 {
  66         struct ip6_ra_chain *ra, *new_ra, **rap;
  67
  68         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  69         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
  70                 return -EINVAL;
  71
  72         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  73
  74         write_lock_bh(&ip6_ra_lock);
  75         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  76                 if (ra->sk == sk) {
  77                         if (sel>=0) {
  78                                 write_unlock_bh(&ip6_ra_lock);
  79                                 kfree(new_ra);
  80                                 return -EADDRINUSE;
  81                         }
  82
  83                         *rap = ra->next;
  84                         write_unlock_bh(&ip6_ra_lock);
  85
  86                         if (ra->destructor)
  87                                 ra->destructor(sk);
  88                         sock_put(sk);
  89                         kfree(ra);
  90                         return 0;
  91                 }
  92         }
  93         if (new_ra == NULL) {
  94                 write_unlock_bh(&ip6_ra_lock);
  95                 return -ENOBUFS;
  96         }
  97         new_ra->sk = sk;
  98         new_ra->sel = sel;
  99         new_ra->destructor = destructor;
 100         new_ra->next = ra;
 101         *rap = new_ra;
 102         sock_hold(sk);
 103         write_unlock_bh(&ip6_ra_lock);
 104         return 0;
 105 }
 106
 107 static
 108 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 109                                            struct ipv6_txoptions *opt)
 110 {
 111         if (inet_sk(sk)->is_icsk) {
 112                 if (opt &&
 113                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 114                     inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 115                         struct inet_connection_sock *icsk = inet_csk(sk);
 116                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 117                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 118                 }
 119                 opt = xchg(&inet6_sk(sk)->opt, opt);
 120         } else {
 121                 write_lock(&sk->sk_dst_lock);
 122                 opt = xchg(&inet6_sk(sk)->opt, opt);
 123                 write_unlock(&sk->sk_dst_lock);
 124         }
 125         sk_dst_reset(sk);
 126
 127         return opt;
 128 }
 129
 130 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 131                     char __user *optval, int optlen)
 132 {
 133         struct ipv6_pinfo *np = inet6_sk(sk);
 134         struct net *net = sock_net(sk);
 135         int val, valbool;
 136         int retv = -ENOPROTOOPT;
 137
 138         if (optval == NULL)
 139                 val=0;
 140         else {
 141                 if (optlen >= sizeof(int)) {
 142                         if (get_user(val, (int __user *) optval))
 143                                 return -EFAULT;
 144                 } else
 145                         val = 0;
 146         }
 147
 148         valbool = (val!=0);
 149
 150         if (ip6_mroute_opt(optname))
 151                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 152
 153         lock_sock(sk);
 154
 155         switch (optname) {
 156
 157         case IPV6_ADDRFORM:
 158                 if (optlen < sizeof(int))
 159                         goto e_inval;
 160                 if (val == PF_INET) {
 161                         struct ipv6_txoptions *opt;
 162                         struct sk_buff *pktopt;
 163
 164                         if (sk->sk_type == SOCK_RAW)
 165                                 break;
 166
 167                         if (sk->sk_protocol != IPPROTO_UDP &&
 168                             sk->sk_protocol != IPPROTO_UDPLITE &&
 169                             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                         if (pktopt)
 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)->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                 np->tclass = val;
 320                 retv = 0;
 321                 break;
 322
 323         case IPV6_RECVTCLASS:
 324                 if (optlen < sizeof(int))
 325                         goto e_inval;
 326                 np->rxopt.bits.rxtclass = valbool;
 327                 retv = 0;
 328                 break;
 329
 330         case IPV6_FLOWINFO:
 331                 if (optlen < sizeof(int))
 332                         goto e_inval;
 333                 np->rxopt.bits.rxflow = valbool;
 334                 retv = 0;
 335                 break;
 336
 337         case IPV6_HOPOPTS:
 338         case IPV6_RTHDRDSTOPTS:
 339         case IPV6_RTHDR:
 340         case IPV6_DSTOPTS:
 341         {
 342                 struct ipv6_txoptions *opt;
 343                 if (optlen == 0)
 344                         optval = NULL;
 345
 346                 /* hop-by-hop / destination options are privileged option */
 347                 retv = -EPERM;
 348                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 349                         break;
 350
 351                 if (optlen < sizeof(struct ipv6_opt_hdr) ||
 352                     optlen & 0x7 || optlen > 8 * 255)
 353                         goto e_inval;
 354
 355                 opt = ipv6_renew_options(sk, np->opt, optname,
 356                                          (struct ipv6_opt_hdr __user *)optval,
 357                                          optlen);
 358                 if (IS_ERR(opt)) {
 359                         retv = PTR_ERR(opt);
 360                         break;
 361                 }
 362
 363                 /* routing header option needs extra check */
 364                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 365                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 366                         switch (rthdr->type) {
 367 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 368                         case IPV6_SRCRT_TYPE_2:
 369                                 break;
 370 #endif
 371                         default:
 372                                 goto sticky_done;
 373                         }
 374
 375                         if ((rthdr->hdrlen & 1) ||
 376                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 377                                 goto sticky_done;
 378                 }
 379
 380                 retv = 0;
 381                 opt = ipv6_update_options(sk, opt);
 382 sticky_done:
 383                 if (opt)
 384                         sock_kfree_s(sk, opt, opt->tot_len);
 385                 break;
 386         }
 387
 388         case IPV6_2292PKTOPTIONS:
 389         {
 390                 struct ipv6_txoptions *opt = NULL;
 391                 struct msghdr msg;
 392                 struct flowi fl;
 393                 int junk;
 394
 395                 fl.fl6_flowlabel = 0;
 396                 fl.oif = sk->sk_bound_dev_if;
 397
 398                 if (optlen == 0)
 399                         goto update;
 400
 401                 /* 1K is probably excessive
 402                  * 1K is surely not enough, 2K per standard header is 16K.
 403                  */
 404                 retv = -EINVAL;
 405                 if (optlen > 64*1024)
 406                         break;
 407
 408                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 409                 retv = -ENOBUFS;
 410                 if (opt == NULL)
 411                         break;
 412
 413                 memset(opt, 0, sizeof(*opt));
 414                 opt->tot_len = sizeof(*opt) + optlen;
 415                 retv = -EFAULT;
 416                 if (copy_from_user(opt+1, optval, optlen))
 417                         goto done;
 418
 419                 msg.msg_controllen = optlen;
 420                 msg.msg_control = (void*)(opt+1);
 421
 422                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
 423                 if (retv)
 424                         goto done;
 425 update:
 426                 retv = 0;
 427                 opt = ipv6_update_options(sk, opt);
 428 done:
 429                 if (opt)
 430                         sock_kfree_s(sk, opt, opt->tot_len);
 431                 break;
 432         }
 433         case IPV6_UNICAST_HOPS:
 434                 if (optlen < sizeof(int))
 435                         goto e_inval;
 436                 if (val > 255 || val < -1)
 437                         goto e_inval;
 438                 np->hop_limit = val;
 439                 retv = 0;
 440                 break;
 441
 442         case IPV6_MULTICAST_HOPS:
 443                 if (sk->sk_type == SOCK_STREAM)
 444                         goto e_inval;
 445                 if (optlen < sizeof(int))
 446                         goto e_inval;
 447                 if (val > 255 || val < -1)
 448                         goto e_inval;
 449                 np->mcast_hops = val;
 450                 retv = 0;
 451                 break;
 452
 453         case IPV6_MULTICAST_LOOP:
 454                 if (optlen < sizeof(int))
 455                         goto e_inval;
 456                 np->mc_loop = valbool;
 457                 retv = 0;
 458                 break;
 459
 460         case IPV6_MULTICAST_IF:
 461                 if (sk->sk_type == SOCK_STREAM)
 462                         goto e_inval;
 463                 if (optlen < sizeof(int))
 464                         goto e_inval;
 465
 466                 if (val) {
 467                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 468                                 goto e_inval;
 469
 470                         if (__dev_get_by_index(net, val) == NULL) {
 471                                 retv = -ENODEV;
 472                                 break;
 473                         }
 474                 }
 475                 np->mcast_oif = val;
 476                 retv = 0;
 477                 break;
 478         case IPV6_ADD_MEMBERSHIP:
 479         case IPV6_DROP_MEMBERSHIP:
 480         {
 481                 struct ipv6_mreq mreq;
 482
 483                 if (optlen < sizeof(struct ipv6_mreq))
 484                         goto e_inval;
 485
 486                 retv = -EPROTO;
 487                 if (inet_sk(sk)->is_icsk)
 488                         break;
 489
 490                 retv = -EFAULT;
 491                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 492                         break;
 493
 494                 if (optname == IPV6_ADD_MEMBERSHIP)
 495                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 496                 else
 497                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 498                 break;
 499         }
 500         case IPV6_JOIN_ANYCAST:
 501         case IPV6_LEAVE_ANYCAST:
 502         {
 503                 struct ipv6_mreq mreq;
 504
 505                 if (optlen < sizeof(struct ipv6_mreq))
 506                         goto e_inval;
 507
 508                 retv = -EFAULT;
 509                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 510                         break;
 511
 512                 if (optname == IPV6_JOIN_ANYCAST)
 513                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 514                 else
 515                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 516                 break;
 517         }
 518         case MCAST_JOIN_GROUP:
 519         case MCAST_LEAVE_GROUP:
 520         {
 521                 struct group_req greq;
 522                 struct sockaddr_in6 *psin6;
 523
 524                 if (optlen < sizeof(struct group_req))
 525                         goto e_inval;
 526
 527                 retv = -EFAULT;
 528                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 529                         break;
 530                 if (greq.gr_group.ss_family != AF_INET6) {
 531                         retv = -EADDRNOTAVAIL;
 532                         break;
 533                 }
 534                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 535                 if (optname == MCAST_JOIN_GROUP)
 536                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 537                                 &psin6->sin6_addr);
 538                 else
 539                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 540                                 &psin6->sin6_addr);
 541                 break;
 542         }
 543         case MCAST_JOIN_SOURCE_GROUP:
 544         case MCAST_LEAVE_SOURCE_GROUP:
 545         case MCAST_BLOCK_SOURCE:
 546         case MCAST_UNBLOCK_SOURCE:
 547         {
 548                 struct group_source_req greqs;
 549                 int omode, add;
 550
 551                 if (optlen < sizeof(struct group_source_req))
 552                         goto e_inval;
 553                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 554                         retv = -EFAULT;
 555                         break;
 556                 }
 557                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 558                     greqs.gsr_source.ss_family != AF_INET6) {
 559                         retv = -EADDRNOTAVAIL;
 560                         break;
 561                 }
 562                 if (optname == MCAST_BLOCK_SOURCE) {
 563                         omode = MCAST_EXCLUDE;
 564                         add = 1;
 565                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 566                         omode = MCAST_EXCLUDE;
 567                         add = 0;
 568                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 569                         struct sockaddr_in6 *psin6;
 570
 571                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 572                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 573                                 &psin6->sin6_addr);
 574                         /* prior join w/ different source is ok */
 575                         if (retv && retv != -EADDRINUSE)
 576                                 break;
 577                         omode = MCAST_INCLUDE;
 578                         add = 1;
 579                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 580                         omode = MCAST_INCLUDE;
 581                         add = 0;
 582                 }
 583                 retv = ip6_mc_source(add, omode, sk, &greqs);
 584                 break;
 585         }
 586         case MCAST_MSFILTER:
 587         {
 588                 extern int sysctl_mld_max_msf;
 589                 struct group_filter *gsf;
 590
 591                 if (optlen < GROUP_FILTER_SIZE(0))
 592                         goto e_inval;
 593                 if (optlen > sysctl_optmem_max) {
 594                         retv = -ENOBUFS;
 595                         break;
 596                 }
 597                 gsf = kmalloc(optlen,GFP_KERNEL);
 598                 if (!gsf) {
 599                         retv = -ENOBUFS;
 600                         break;
 601                 }
 602                 retv = -EFAULT;
 603                 if (copy_from_user(gsf, optval, optlen)) {
 604                         kfree(gsf);
 605                         break;
 606                 }
 607                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 608                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 609                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 610                         kfree(gsf);
 611                         retv = -ENOBUFS;
 612                         break;
 613                 }
 614                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 615                         kfree(gsf);
 616                         retv = -EINVAL;
 617                         break;
 618                 }
 619                 retv = ip6_mc_msfilter(sk, gsf);
 620                 kfree(gsf);
 621
 622                 break;
 623         }
 624         case IPV6_ROUTER_ALERT:
 625                 if (optlen < sizeof(int))
 626                         goto e_inval;
 627                 retv = ip6_ra_control(sk, val, NULL);
 628                 break;
 629         case IPV6_MTU_DISCOVER:
 630                 if (optlen < sizeof(int))
 631                         goto e_inval;
 632                 if (val<0 || val>3)
 633                         goto e_inval;
 634                 np->pmtudisc = val;
 635                 retv = 0;
 636                 break;
 637         case IPV6_MTU:
 638                 if (optlen < sizeof(int))
 639                         goto e_inval;
 640                 if (val && val < IPV6_MIN_MTU)
 641                         goto e_inval;
 642                 np->frag_size = val;
 643                 retv = 0;
 644                 break;
 645         case IPV6_RECVERR:
 646                 if (optlen < sizeof(int))
 647                         goto e_inval;
 648                 np->recverr = valbool;
 649                 if (!val)
 650                         skb_queue_purge(&sk->sk_error_queue);
 651                 retv = 0;
 652                 break;
 653         case IPV6_FLOWINFO_SEND:
 654                 if (optlen < sizeof(int))
 655                         goto e_inval;
 656                 np->sndflow = valbool;
 657                 retv = 0;
 658                 break;
 659         case IPV6_FLOWLABEL_MGR:
 660                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 661                 break;
 662         case IPV6_IPSEC_POLICY:
 663         case IPV6_XFRM_POLICY:
 664                 retv = -EPERM;
 665                 if (!capable(CAP_NET_ADMIN))
 666                         break;
 667                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 668                 break;
 669
 670         case IPV6_ADDR_PREFERENCES:
 671             {
 672                 unsigned int pref = 0;
 673                 unsigned int prefmask = ~0;
 674
 675                 if (optlen < sizeof(int))
 676                         goto e_inval;
 677
 678                 retv = -EINVAL;
 679
 680                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 681                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 682                                IPV6_PREFER_SRC_TMP|
 683                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 684                 case IPV6_PREFER_SRC_PUBLIC:
 685                         pref |= IPV6_PREFER_SRC_PUBLIC;
 686                         break;
 687                 case IPV6_PREFER_SRC_TMP:
 688                         pref |= IPV6_PREFER_SRC_TMP;
 689                         break;
 690                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 691                         break;
 692                 case 0:
 693                         goto pref_skip_pubtmp;
 694                 default:
 695                         goto e_inval;
 696                 }
 697
 698                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 699                               IPV6_PREFER_SRC_TMP);
 700 pref_skip_pubtmp:
 701
 702                 /* check HOME/COA conflicts */
 703                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 704                 case IPV6_PREFER_SRC_HOME:
 705                         break;
 706                 case IPV6_PREFER_SRC_COA:
 707                         pref |= IPV6_PREFER_SRC_COA;
 708                 case 0:
 709                         goto pref_skip_coa;
 710                 default:
 711                         goto e_inval;
 712                 }
 713
 714                 prefmask &= ~IPV6_PREFER_SRC_COA;
 715 pref_skip_coa:
 716
 717                 /* check CGA/NONCGA conflicts */
 718                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 719                 case IPV6_PREFER_SRC_CGA:
 720                 case IPV6_PREFER_SRC_NONCGA:
 721                 case 0:
 722                         break;
 723                 default:
 724                         goto e_inval;
 725                 }
 726
 727                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 728                 retv = 0;
 729
 730                 break;
 731             }
 732         }
 733
 734         release_sock(sk);
 735
 736         return retv;
 737
 738 e_inval:
 739         release_sock(sk);
 740         return -EINVAL;
 741 }
 742
 743 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 744                     char __user *optval, int optlen)
 745 {
 746         int err;
 747
 748         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 749                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 750
 751         if (level != SOL_IPV6)
 752                 return -ENOPROTOOPT;
 753
 754         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 755 #ifdef CONFIG_NETFILTER
 756         /* we need to exclude all possible ENOPROTOOPTs except default case */
 757         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 758                         optname != IPV6_XFRM_POLICY) {
 759                 lock_sock(sk);
 760                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 761                                 optlen);
 762                 release_sock(sk);
 763         }
 764 #endif
 765         return err;
 766 }
 767
 768 EXPORT_SYMBOL(ipv6_setsockopt);
 769
 770 #ifdef CONFIG_COMPAT
 771 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 772                            char __user *optval, int optlen)
 773 {
 774         int err;
 775
 776         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 777                 if (udp_prot.compat_setsockopt != NULL)
 778                         return udp_prot.compat_setsockopt(sk, level, optname,
 779                                                           optval, optlen);
 780                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 781         }
 782
 783         if (level != SOL_IPV6)
 784                 return -ENOPROTOOPT;
 785
 786         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 787                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 788                         ipv6_setsockopt);
 789
 790         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 791 #ifdef CONFIG_NETFILTER
 792         /* we need to exclude all possible ENOPROTOOPTs except default case */
 793         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 794             optname != IPV6_XFRM_POLICY) {
 795                 lock_sock(sk);
 796                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 797                                            optval, optlen);
 798                 release_sock(sk);
 799         }
 800 #endif
 801         return err;
 802 }
 803
 804 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 805 #endif
 806
 807 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 808                                   int optname, char __user *optval, int len)
 809 {
 810         struct ipv6_opt_hdr *hdr;
 811
 812         if (!opt)
 813                 return 0;
 814
 815         switch(optname) {
 816         case IPV6_HOPOPTS:
 817                 hdr = opt->hopopt;
 818                 break;
 819         case IPV6_RTHDRDSTOPTS:
 820                 hdr = opt->dst0opt;
 821                 break;
 822         case IPV6_RTHDR:
 823                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 824                 break;
 825         case IPV6_DSTOPTS:
 826                 hdr = opt->dst1opt;
 827                 break;
 828         default:
 829                 return -EINVAL; /* should not happen */
 830         }
 831
 832         if (!hdr)
 833                 return 0;
 834
 835         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 836         if (copy_to_user(optval, hdr, len))
 837                 return -EFAULT;
 838         return len;
 839 }
 840
 841 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 842                     char __user *optval, int __user *optlen)
 843 {
 844         struct ipv6_pinfo *np = inet6_sk(sk);
 845         int len;
 846         int val;
 847
 848         if (ip6_mroute_opt(optname))
 849                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 850
 851         if (get_user(len, optlen))
 852                 return -EFAULT;
 853         switch (optname) {
 854         case IPV6_ADDRFORM:
 855                 if (sk->sk_protocol != IPPROTO_UDP &&
 856                     sk->sk_protocol != IPPROTO_UDPLITE &&
 857                     sk->sk_protocol != IPPROTO_TCP)
 858                         return -EINVAL;
 859                 if (sk->sk_state != TCP_ESTABLISHED)
 860                         return -ENOTCONN;
 861                 val = sk->sk_family;
 862                 break;
 863         case MCAST_MSFILTER:
 864         {
 865                 struct group_filter gsf;
 866                 int err;
 867
 868                 if (len < GROUP_FILTER_SIZE(0))
 869                         return -EINVAL;
 870                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 871                         return -EFAULT;
 872                 lock_sock(sk);
 873                 err = ip6_mc_msfget(sk, &gsf,
 874                         (struct group_filter __user *)optval, optlen);
 875                 release_sock(sk);
 876                 return err;
 877         }
 878
 879         case IPV6_2292PKTOPTIONS:
 880         {
 881                 struct msghdr msg;
 882                 struct sk_buff *skb;
 883
 884                 if (sk->sk_type != SOCK_STREAM)
 885                         return -ENOPROTOOPT;
 886
 887                 msg.msg_control = optval;
 888                 msg.msg_controllen = len;
 889                 msg.msg_flags = 0;
 890
 891                 lock_sock(sk);
 892                 skb = np->pktoptions;
 893                 if (skb)
 894                         atomic_inc(&skb->users);
 895                 release_sock(sk);
 896
 897                 if (skb) {
 898                         int err = datagram_recv_ctl(sk, &msg, skb);
 899                         kfree_skb(skb);
 900                         if (err)
 901                                 return err;
 902                 } else {
 903                         if (np->rxopt.bits.rxinfo) {
 904                                 struct in6_pktinfo src_info;
 905                                 src_info.ipi6_ifindex = np->mcast_oif;
 906                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 907                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 908                         }
 909                         if (np->rxopt.bits.rxhlim) {
 910                                 int hlim = np->mcast_hops;
 911                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 912                         }
 913                         if (np->rxopt.bits.rxoinfo) {
 914                                 struct in6_pktinfo src_info;
 915                                 src_info.ipi6_ifindex = np->mcast_oif;
 916                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 917                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 918                         }
 919                         if (np->rxopt.bits.rxohlim) {
 920                                 int hlim = np->mcast_hops;
 921                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 922                         }
 923                 }
 924                 len -= msg.msg_controllen;
 925                 return put_user(len, optlen);
 926         }
 927         case IPV6_MTU:
 928         {
 929                 struct dst_entry *dst;
 930                 val = 0;
 931                 lock_sock(sk);
 932                 dst = sk_dst_get(sk);
 933                 if (dst) {
 934                         val = dst_mtu(dst);
 935                         dst_release(dst);
 936                 }
 937                 release_sock(sk);
 938                 if (!val)
 939                         return -ENOTCONN;
 940                 break;
 941         }
 942
 943         case IPV6_V6ONLY:
 944                 val = np->ipv6only;
 945                 break;
 946
 947         case IPV6_RECVPKTINFO:
 948                 val = np->rxopt.bits.rxinfo;
 949                 break;
 950
 951         case IPV6_2292PKTINFO:
 952                 val = np->rxopt.bits.rxoinfo;
 953                 break;
 954
 955         case IPV6_RECVHOPLIMIT:
 956                 val = np->rxopt.bits.rxhlim;
 957                 break;
 958
 959         case IPV6_2292HOPLIMIT:
 960                 val = np->rxopt.bits.rxohlim;
 961                 break;
 962
 963         case IPV6_RECVRTHDR:
 964                 val = np->rxopt.bits.srcrt;
 965                 break;
 966
 967         case IPV6_2292RTHDR:
 968                 val = np->rxopt.bits.osrcrt;
 969                 break;
 970
 971         case IPV6_HOPOPTS:
 972         case IPV6_RTHDRDSTOPTS:
 973         case IPV6_RTHDR:
 974         case IPV6_DSTOPTS:
 975         {
 976
 977                 lock_sock(sk);
 978                 len = ipv6_getsockopt_sticky(sk, np->opt,
 979                                              optname, optval, len);
 980                 release_sock(sk);
 981                 /* check if ipv6_getsockopt_sticky() returns err code */
 982                 if (len < 0)
 983                         return len;
 984                 return put_user(len, optlen);
 985         }
 986
 987         case IPV6_RECVHOPOPTS:
 988                 val = np->rxopt.bits.hopopts;
 989                 break;
 990
 991         case IPV6_2292HOPOPTS:
 992                 val = np->rxopt.bits.ohopopts;
 993                 break;
 994
 995         case IPV6_RECVDSTOPTS:
 996                 val = np->rxopt.bits.dstopts;
 997                 break;
 998
 999         case IPV6_2292DSTOPTS:
1000                 val = np->rxopt.bits.odstopts;
1001                 break;
1002
1003         case IPV6_TCLASS:
1004                 val = np->tclass;
1005                 if (val < 0)
1006                         val = 0;
1007                 break;
1008
1009         case IPV6_RECVTCLASS:
1010                 val = np->rxopt.bits.rxtclass;
1011                 break;
1012
1013         case IPV6_FLOWINFO:
1014                 val = np->rxopt.bits.rxflow;
1015                 break;
1016
1017         case IPV6_UNICAST_HOPS:
1018         case IPV6_MULTICAST_HOPS:
1019         {
1020                 struct dst_entry *dst;
1021
1022                 if (optname == IPV6_UNICAST_HOPS)
1023                         val = np->hop_limit;
1024                 else
1025                         val = np->mcast_hops;
1026
1027                 dst = sk_dst_get(sk);
1028                 if (dst) {
1029                         if (val < 0)
1030                                 val = ip6_dst_hoplimit(dst);
1031                         dst_release(dst);
1032                 }
1033                 if (val < 0)
1034                         val = ipv6_devconf.hop_limit;
1035                 break;
1036         }
1037
1038         case IPV6_MULTICAST_LOOP:
1039                 val = np->mc_loop;
1040                 break;
1041
1042         case IPV6_MULTICAST_IF:
1043                 val = np->mcast_oif;
1044                 break;
1045
1046         case IPV6_MTU_DISCOVER:
1047                 val = np->pmtudisc;
1048                 break;
1049
1050         case IPV6_RECVERR:
1051                 val = np->recverr;
1052                 break;
1053
1054         case IPV6_FLOWINFO_SEND:
1055                 val = np->sndflow;
1056                 break;
1057
1058         case IPV6_ADDR_PREFERENCES:
1059                 val = 0;
1060
1061                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1062                         val |= IPV6_PREFER_SRC_TMP;
1063                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1064                         val |= IPV6_PREFER_SRC_PUBLIC;
1065                 else {
1066                         /* XXX: should we return system default? */
1067                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1068                 }
1069
1070                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1071                         val |= IPV6_PREFER_SRC_COA;
1072                 else
1073                         val |= IPV6_PREFER_SRC_HOME;
1074                 break;
1075
1076         default:
1077                 return -ENOPROTOOPT;
1078         }
1079         len = min_t(unsigned int, sizeof(int), len);
1080         if(put_user(len, optlen))
1081                 return -EFAULT;
1082         if(copy_to_user(optval,&val,len))
1083                 return -EFAULT;
1084         return 0;
1085 }
1086
1087 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1088                     char __user *optval, int __user *optlen)
1089 {
1090         int err;
1091
1092         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1093                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1094
1095         if(level != SOL_IPV6)
1096                 return -ENOPROTOOPT;
1097
1098         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1099 #ifdef CONFIG_NETFILTER
1100         /* we need to exclude all possible ENOPROTOOPTs except default case */
1101         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1102                 int len;
1103
1104                 if (get_user(len, optlen))
1105                         return -EFAULT;
1106
1107                 lock_sock(sk);
1108                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1109                                 &len);
1110                 release_sock(sk);
1111                 if (err >= 0)
1112                         err = put_user(len, optlen);
1113         }
1114 #endif
1115         return err;
1116 }
1117
1118 EXPORT_SYMBOL(ipv6_getsockopt);
1119
1120 #ifdef CONFIG_COMPAT
1121 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1122                            char __user *optval, int __user *optlen)
1123 {
1124         int err;
1125
1126         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1127                 if (udp_prot.compat_getsockopt != NULL)
1128                         return udp_prot.compat_getsockopt(sk, level, optname,
1129                                                           optval, optlen);
1130                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1131         }
1132
1133         if (level != SOL_IPV6)
1134                 return -ENOPROTOOPT;
1135
1136         if (optname == MCAST_MSFILTER)
1137                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1138                         ipv6_getsockopt);
1139
1140         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1141 #ifdef CONFIG_NETFILTER
1142         /* we need to exclude all possible ENOPROTOOPTs except default case */
1143         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1144                 int len;
1145
1146                 if (get_user(len, optlen))
1147                         return -EFAULT;
1148
1149                 lock_sock(sk);
1150                 err = compat_nf_getsockopt(sk, PF_INET6,
1151                                            optname, optval, &len);
1152                 release_sock(sk);
1153                 if (err >= 0)
1154                         err = put_user(len, optlen);
1155         }
1156 #endif
1157         return err;
1158 }
1159
1160 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1161 #endif
1162