git.oblomov.eu Git - linux-2.6/blob - net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  *
  15  *      FIXME: Make the setsockopt code POSIX compliant: That is
  16  *
  17  *      o       Truncate getsockopt returns
  18  *      o       Return an optlen of the truncated length if need be
  19  *
  20  *      Changes:
  21  *      David L Stevens <dlstevens@us.ibm.com>:
  22  *              - added multicast source filtering API for MLDv2
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/capability.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/socket.h>
  30 #include <linux/sockios.h>
  31 #include <linux/net.h>
  32 #include <linux/in6.h>
  33 #include <linux/mroute6.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/init.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/netfilter.h>
  39
  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                         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
 344                 /* remove any sticky options header with a zero option
 345                  * length, per RFC3542.
 346                  */
 347                 if (optlen == 0)
 348                         optval = NULL;
 349                 else if (optval == NULL)
 350                         goto e_inval;
 351                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 352                          optlen & 0x7 || optlen > 8 * 255)
 353                         goto e_inval;
 354
 355                 /* hop-by-hop / destination options are privileged option */
 356                 retv = -EPERM;
 357                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 358                         break;
 359
 360                 opt = ipv6_renew_options(sk, np->opt, optname,
 361                                          (struct ipv6_opt_hdr __user *)optval,
 362                                          optlen);
 363                 if (IS_ERR(opt)) {
 364                         retv = PTR_ERR(opt);
 365                         break;
 366                 }
 367
 368                 /* routing header option needs extra check */
 369                 retv = -EINVAL;
 370                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 371                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 372                         switch (rthdr->type) {
 373 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 374                         case IPV6_SRCRT_TYPE_2:
 375                                 if (rthdr->hdrlen != 2 ||
 376                                     rthdr->segments_left != 1)
 377                                         goto sticky_done;
 378
 379                                 break;
 380 #endif
 381                         default:
 382                                 goto sticky_done;
 383                         }
 384
 385                         if ((rthdr->hdrlen & 1) ||
 386                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 387                                 goto sticky_done;
 388                 }
 389
 390                 retv = 0;
 391                 opt = ipv6_update_options(sk, opt);
 392 sticky_done:
 393                 if (opt)
 394                         sock_kfree_s(sk, opt, opt->tot_len);
 395                 break;
 396         }
 397
 398         case IPV6_PKTINFO:
 399         {
 400                 struct in6_pktinfo pkt;
 401
 402                 if (optlen == 0)
 403                         goto e_inval;
 404                 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
 405                         goto e_inval;
 406
 407                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 408                                 retv = -EFAULT;
 409                                 break;
 410                 }
 411                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 412                         goto e_inval;
 413
 414                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 415                 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
 416                 retv = 0;
 417                 break;
 418         }
 419
 420         case IPV6_2292PKTOPTIONS:
 421         {
 422                 struct ipv6_txoptions *opt = NULL;
 423                 struct msghdr msg;
 424                 struct flowi fl;
 425                 int junk;
 426
 427                 fl.fl6_flowlabel = 0;
 428                 fl.oif = sk->sk_bound_dev_if;
 429
 430                 if (optlen == 0)
 431                         goto update;
 432
 433                 /* 1K is probably excessive
 434                  * 1K is surely not enough, 2K per standard header is 16K.
 435                  */
 436                 retv = -EINVAL;
 437                 if (optlen > 64*1024)
 438                         break;
 439
 440                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 441                 retv = -ENOBUFS;
 442                 if (opt == NULL)
 443                         break;
 444
 445                 memset(opt, 0, sizeof(*opt));
 446                 opt->tot_len = sizeof(*opt) + optlen;
 447                 retv = -EFAULT;
 448                 if (copy_from_user(opt+1, optval, optlen))
 449                         goto done;
 450
 451                 msg.msg_controllen = optlen;
 452                 msg.msg_control = (void*)(opt+1);
 453
 454                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
 455                 if (retv)
 456                         goto done;
 457 update:
 458                 retv = 0;
 459                 opt = ipv6_update_options(sk, opt);
 460 done:
 461                 if (opt)
 462                         sock_kfree_s(sk, opt, opt->tot_len);
 463                 break;
 464         }
 465         case IPV6_UNICAST_HOPS:
 466                 if (optlen < sizeof(int))
 467                         goto e_inval;
 468                 if (val > 255 || val < -1)
 469                         goto e_inval;
 470                 np->hop_limit = val;
 471                 retv = 0;
 472                 break;
 473
 474         case IPV6_MULTICAST_HOPS:
 475                 if (sk->sk_type == SOCK_STREAM)
 476                         break;
 477                 if (optlen < sizeof(int))
 478                         goto e_inval;
 479                 if (val > 255 || val < -1)
 480                         goto e_inval;
 481                 np->mcast_hops = val;
 482                 retv = 0;
 483                 break;
 484
 485         case IPV6_MULTICAST_LOOP:
 486                 if (optlen < sizeof(int))
 487                         goto e_inval;
 488                 if (val != valbool)
 489                         goto e_inval;
 490                 np->mc_loop = valbool;
 491                 retv = 0;
 492                 break;
 493
 494         case IPV6_MULTICAST_IF:
 495                 if (sk->sk_type == SOCK_STREAM)
 496                         break;
 497                 if (optlen < sizeof(int))
 498                         goto e_inval;
 499
 500                 if (val) {
 501                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 502                                 goto e_inval;
 503
 504                         if (__dev_get_by_index(net, val) == NULL) {
 505                                 retv = -ENODEV;
 506                                 break;
 507                         }
 508                 }
 509                 np->mcast_oif = val;
 510                 retv = 0;
 511                 break;
 512         case IPV6_ADD_MEMBERSHIP:
 513         case IPV6_DROP_MEMBERSHIP:
 514         {
 515                 struct ipv6_mreq mreq;
 516
 517                 if (optlen < sizeof(struct ipv6_mreq))
 518                         goto e_inval;
 519
 520                 retv = -EPROTO;
 521                 if (inet_sk(sk)->is_icsk)
 522                         break;
 523
 524                 retv = -EFAULT;
 525                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 526                         break;
 527
 528                 if (optname == IPV6_ADD_MEMBERSHIP)
 529                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 530                 else
 531                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 532                 break;
 533         }
 534         case IPV6_JOIN_ANYCAST:
 535         case IPV6_LEAVE_ANYCAST:
 536         {
 537                 struct ipv6_mreq mreq;
 538
 539                 if (optlen < sizeof(struct ipv6_mreq))
 540                         goto e_inval;
 541
 542                 retv = -EFAULT;
 543                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 544                         break;
 545
 546                 if (optname == IPV6_JOIN_ANYCAST)
 547                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 548                 else
 549                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 550                 break;
 551         }
 552         case MCAST_JOIN_GROUP:
 553         case MCAST_LEAVE_GROUP:
 554         {
 555                 struct group_req greq;
 556                 struct sockaddr_in6 *psin6;
 557
 558                 if (optlen < sizeof(struct group_req))
 559                         goto e_inval;
 560
 561                 retv = -EFAULT;
 562                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 563                         break;
 564                 if (greq.gr_group.ss_family != AF_INET6) {
 565                         retv = -EADDRNOTAVAIL;
 566                         break;
 567                 }
 568                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 569                 if (optname == MCAST_JOIN_GROUP)
 570                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 571                                 &psin6->sin6_addr);
 572                 else
 573                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 574                                 &psin6->sin6_addr);
 575                 break;
 576         }
 577         case MCAST_JOIN_SOURCE_GROUP:
 578         case MCAST_LEAVE_SOURCE_GROUP:
 579         case MCAST_BLOCK_SOURCE:
 580         case MCAST_UNBLOCK_SOURCE:
 581         {
 582                 struct group_source_req greqs;
 583                 int omode, add;
 584
 585                 if (optlen < sizeof(struct group_source_req))
 586                         goto e_inval;
 587                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 588                         retv = -EFAULT;
 589                         break;
 590                 }
 591                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 592                     greqs.gsr_source.ss_family != AF_INET6) {
 593                         retv = -EADDRNOTAVAIL;
 594                         break;
 595                 }
 596                 if (optname == MCAST_BLOCK_SOURCE) {
 597                         omode = MCAST_EXCLUDE;
 598                         add = 1;
 599                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 600                         omode = MCAST_EXCLUDE;
 601                         add = 0;
 602                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 603                         struct sockaddr_in6 *psin6;
 604
 605                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 606                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 607                                 &psin6->sin6_addr);
 608                         /* prior join w/ different source is ok */
 609                         if (retv && retv != -EADDRINUSE)
 610                                 break;
 611                         omode = MCAST_INCLUDE;
 612                         add = 1;
 613                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 614                         omode = MCAST_INCLUDE;
 615                         add = 0;
 616                 }
 617                 retv = ip6_mc_source(add, omode, sk, &greqs);
 618                 break;
 619         }
 620         case MCAST_MSFILTER:
 621         {
 622                 extern int sysctl_mld_max_msf;
 623                 struct group_filter *gsf;
 624
 625                 if (optlen < GROUP_FILTER_SIZE(0))
 626                         goto e_inval;
 627                 if (optlen > sysctl_optmem_max) {
 628                         retv = -ENOBUFS;
 629                         break;
 630                 }
 631                 gsf = kmalloc(optlen,GFP_KERNEL);
 632                 if (!gsf) {
 633                         retv = -ENOBUFS;
 634                         break;
 635                 }
 636                 retv = -EFAULT;
 637                 if (copy_from_user(gsf, optval, optlen)) {
 638                         kfree(gsf);
 639                         break;
 640                 }
 641                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 642                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 643                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 644                         kfree(gsf);
 645                         retv = -ENOBUFS;
 646                         break;
 647                 }
 648                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 649                         kfree(gsf);
 650                         retv = -EINVAL;
 651                         break;
 652                 }
 653                 retv = ip6_mc_msfilter(sk, gsf);
 654                 kfree(gsf);
 655
 656                 break;
 657         }
 658         case IPV6_ROUTER_ALERT:
 659                 if (optlen < sizeof(int))
 660                         goto e_inval;
 661                 retv = ip6_ra_control(sk, val);
 662                 break;
 663         case IPV6_MTU_DISCOVER:
 664                 if (optlen < sizeof(int))
 665                         goto e_inval;
 666                 if (val<0 || val>3)
 667                         goto e_inval;
 668                 np->pmtudisc = val;
 669                 retv = 0;
 670                 break;
 671         case IPV6_MTU:
 672                 if (optlen < sizeof(int))
 673                         goto e_inval;
 674                 if (val && val < IPV6_MIN_MTU)
 675                         goto e_inval;
 676                 np->frag_size = val;
 677                 retv = 0;
 678                 break;
 679         case IPV6_RECVERR:
 680                 if (optlen < sizeof(int))
 681                         goto e_inval;
 682                 np->recverr = valbool;
 683                 if (!val)
 684                         skb_queue_purge(&sk->sk_error_queue);
 685                 retv = 0;
 686                 break;
 687         case IPV6_FLOWINFO_SEND:
 688                 if (optlen < sizeof(int))
 689                         goto e_inval;
 690                 np->sndflow = valbool;
 691                 retv = 0;
 692                 break;
 693         case IPV6_FLOWLABEL_MGR:
 694                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 695                 break;
 696         case IPV6_IPSEC_POLICY:
 697         case IPV6_XFRM_POLICY:
 698                 retv = -EPERM;
 699                 if (!capable(CAP_NET_ADMIN))
 700                         break;
 701                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 702                 break;
 703
 704         case IPV6_ADDR_PREFERENCES:
 705             {
 706                 unsigned int pref = 0;
 707                 unsigned int prefmask = ~0;
 708
 709                 if (optlen < sizeof(int))
 710                         goto e_inval;
 711
 712                 retv = -EINVAL;
 713
 714                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 715                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 716                                IPV6_PREFER_SRC_TMP|
 717                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 718                 case IPV6_PREFER_SRC_PUBLIC:
 719                         pref |= IPV6_PREFER_SRC_PUBLIC;
 720                         break;
 721                 case IPV6_PREFER_SRC_TMP:
 722                         pref |= IPV6_PREFER_SRC_TMP;
 723                         break;
 724                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 725                         break;
 726                 case 0:
 727                         goto pref_skip_pubtmp;
 728                 default:
 729                         goto e_inval;
 730                 }
 731
 732                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 733                               IPV6_PREFER_SRC_TMP);
 734 pref_skip_pubtmp:
 735
 736                 /* check HOME/COA conflicts */
 737                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 738                 case IPV6_PREFER_SRC_HOME:
 739                         break;
 740                 case IPV6_PREFER_SRC_COA:
 741                         pref |= IPV6_PREFER_SRC_COA;
 742                 case 0:
 743                         goto pref_skip_coa;
 744                 default:
 745                         goto e_inval;
 746                 }
 747
 748                 prefmask &= ~IPV6_PREFER_SRC_COA;
 749 pref_skip_coa:
 750
 751                 /* check CGA/NONCGA conflicts */
 752                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 753                 case IPV6_PREFER_SRC_CGA:
 754                 case IPV6_PREFER_SRC_NONCGA:
 755                 case 0:
 756                         break;
 757                 default:
 758                         goto e_inval;
 759                 }
 760
 761                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 762                 retv = 0;
 763
 764                 break;
 765             }
 766         }
 767
 768         release_sock(sk);
 769
 770         return retv;
 771
 772 e_inval:
 773         release_sock(sk);
 774         return -EINVAL;
 775 }
 776
 777 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 778                     char __user *optval, int optlen)
 779 {
 780         int err;
 781
 782         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 783                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 784
 785         if (level != SOL_IPV6)
 786                 return -ENOPROTOOPT;
 787
 788         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 789 #ifdef CONFIG_NETFILTER
 790         /* we need to exclude all possible ENOPROTOOPTs except default case */
 791         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 792                         optname != IPV6_XFRM_POLICY) {
 793                 lock_sock(sk);
 794                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 795                                 optlen);
 796                 release_sock(sk);
 797         }
 798 #endif
 799         return err;
 800 }
 801
 802 EXPORT_SYMBOL(ipv6_setsockopt);
 803
 804 #ifdef CONFIG_COMPAT
 805 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 806                            char __user *optval, int optlen)
 807 {
 808         int err;
 809
 810         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 811                 if (udp_prot.compat_setsockopt != NULL)
 812                         return udp_prot.compat_setsockopt(sk, level, optname,
 813                                                           optval, optlen);
 814                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 815         }
 816
 817         if (level != SOL_IPV6)
 818                 return -ENOPROTOOPT;
 819
 820         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 821                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 822                         ipv6_setsockopt);
 823
 824         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 825 #ifdef CONFIG_NETFILTER
 826         /* we need to exclude all possible ENOPROTOOPTs except default case */
 827         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 828             optname != IPV6_XFRM_POLICY) {
 829                 lock_sock(sk);
 830                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 831                                            optval, optlen);
 832                 release_sock(sk);
 833         }
 834 #endif
 835         return err;
 836 }
 837
 838 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 839 #endif
 840
 841 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 842                                   int optname, char __user *optval, int len)
 843 {
 844         struct ipv6_opt_hdr *hdr;
 845
 846         if (!opt)
 847                 return 0;
 848
 849         switch(optname) {
 850         case IPV6_HOPOPTS:
 851                 hdr = opt->hopopt;
 852                 break;
 853         case IPV6_RTHDRDSTOPTS:
 854                 hdr = opt->dst0opt;
 855                 break;
 856         case IPV6_RTHDR:
 857                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 858                 break;
 859         case IPV6_DSTOPTS:
 860                 hdr = opt->dst1opt;
 861                 break;
 862         default:
 863                 return -EINVAL; /* should not happen */
 864         }
 865
 866         if (!hdr)
 867                 return 0;
 868
 869         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 870         if (copy_to_user(optval, hdr, len))
 871                 return -EFAULT;
 872         return len;
 873 }
 874
 875 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 876                     char __user *optval, int __user *optlen)
 877 {
 878         struct ipv6_pinfo *np = inet6_sk(sk);
 879         int len;
 880         int val;
 881
 882         if (ip6_mroute_opt(optname))
 883                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 884
 885         if (get_user(len, optlen))
 886                 return -EFAULT;
 887         switch (optname) {
 888         case IPV6_ADDRFORM:
 889                 if (sk->sk_protocol != IPPROTO_UDP &&
 890                     sk->sk_protocol != IPPROTO_UDPLITE &&
 891                     sk->sk_protocol != IPPROTO_TCP)
 892                         return -ENOPROTOOPT;
 893                 if (sk->sk_state != TCP_ESTABLISHED)
 894                         return -ENOTCONN;
 895                 val = sk->sk_family;
 896                 break;
 897         case MCAST_MSFILTER:
 898         {
 899                 struct group_filter gsf;
 900                 int err;
 901
 902                 if (len < GROUP_FILTER_SIZE(0))
 903                         return -EINVAL;
 904                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 905                         return -EFAULT;
 906                 if (gsf.gf_group.ss_family != AF_INET6)
 907                         return -EADDRNOTAVAIL;
 908                 lock_sock(sk);
 909                 err = ip6_mc_msfget(sk, &gsf,
 910                         (struct group_filter __user *)optval, optlen);
 911                 release_sock(sk);
 912                 return err;
 913         }
 914
 915         case IPV6_2292PKTOPTIONS:
 916         {
 917                 struct msghdr msg;
 918                 struct sk_buff *skb;
 919
 920                 if (sk->sk_type != SOCK_STREAM)
 921                         return -ENOPROTOOPT;
 922
 923                 msg.msg_control = optval;
 924                 msg.msg_controllen = len;
 925                 msg.msg_flags = 0;
 926
 927                 lock_sock(sk);
 928                 skb = np->pktoptions;
 929                 if (skb)
 930                         atomic_inc(&skb->users);
 931                 release_sock(sk);
 932
 933                 if (skb) {
 934                         int err = datagram_recv_ctl(sk, &msg, skb);
 935                         kfree_skb(skb);
 936                         if (err)
 937                                 return err;
 938                 } else {
 939                         if (np->rxopt.bits.rxinfo) {
 940                                 struct in6_pktinfo src_info;
 941                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 942                                         np->sticky_pktinfo.ipi6_ifindex;
 943                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 944                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 945                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 946                         }
 947                         if (np->rxopt.bits.rxhlim) {
 948                                 int hlim = np->mcast_hops;
 949                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 950                         }
 951                         if (np->rxopt.bits.rxoinfo) {
 952                                 struct in6_pktinfo src_info;
 953                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 954                                         np->sticky_pktinfo.ipi6_ifindex;
 955                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 956                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 957                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 958                         }
 959                         if (np->rxopt.bits.rxohlim) {
 960                                 int hlim = np->mcast_hops;
 961                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 962                         }
 963                 }
 964                 len -= msg.msg_controllen;
 965                 return put_user(len, optlen);
 966         }
 967         case IPV6_MTU:
 968         {
 969                 struct dst_entry *dst;
 970                 val = 0;
 971                 lock_sock(sk);
 972                 dst = sk_dst_get(sk);
 973                 if (dst) {
 974                         val = dst_mtu(dst);
 975                         dst_release(dst);
 976                 }
 977                 release_sock(sk);
 978                 if (!val)
 979                         return -ENOTCONN;
 980                 break;
 981         }
 982
 983         case IPV6_V6ONLY:
 984                 val = np->ipv6only;
 985                 break;
 986
 987         case IPV6_RECVPKTINFO:
 988                 val = np->rxopt.bits.rxinfo;
 989                 break;
 990
 991         case IPV6_2292PKTINFO:
 992                 val = np->rxopt.bits.rxoinfo;
 993                 break;
 994
 995         case IPV6_RECVHOPLIMIT:
 996                 val = np->rxopt.bits.rxhlim;
 997                 break;
 998
 999         case IPV6_2292HOPLIMIT:
1000                 val = np->rxopt.bits.rxohlim;
1001                 break;
1002
1003         case IPV6_RECVRTHDR:
1004                 val = np->rxopt.bits.srcrt;
1005                 break;
1006
1007         case IPV6_2292RTHDR:
1008                 val = np->rxopt.bits.osrcrt;
1009                 break;
1010
1011         case IPV6_HOPOPTS:
1012         case IPV6_RTHDRDSTOPTS:
1013         case IPV6_RTHDR:
1014         case IPV6_DSTOPTS:
1015         {
1016
1017                 lock_sock(sk);
1018                 len = ipv6_getsockopt_sticky(sk, np->opt,
1019                                              optname, optval, len);
1020                 release_sock(sk);
1021                 /* check if ipv6_getsockopt_sticky() returns err code */
1022                 if (len < 0)
1023                         return len;
1024                 return put_user(len, optlen);
1025         }
1026
1027         case IPV6_RECVHOPOPTS:
1028                 val = np->rxopt.bits.hopopts;
1029                 break;
1030
1031         case IPV6_2292HOPOPTS:
1032                 val = np->rxopt.bits.ohopopts;
1033                 break;
1034
1035         case IPV6_RECVDSTOPTS:
1036                 val = np->rxopt.bits.dstopts;
1037                 break;
1038
1039         case IPV6_2292DSTOPTS:
1040                 val = np->rxopt.bits.odstopts;
1041                 break;
1042
1043         case IPV6_TCLASS:
1044                 val = np->tclass;
1045                 if (val < 0)
1046                         val = 0;
1047                 break;
1048
1049         case IPV6_RECVTCLASS:
1050                 val = np->rxopt.bits.rxtclass;
1051                 break;
1052
1053         case IPV6_FLOWINFO:
1054                 val = np->rxopt.bits.rxflow;
1055                 break;
1056
1057         case IPV6_UNICAST_HOPS:
1058         case IPV6_MULTICAST_HOPS:
1059         {
1060                 struct dst_entry *dst;
1061
1062                 if (optname == IPV6_UNICAST_HOPS)
1063                         val = np->hop_limit;
1064                 else
1065                         val = np->mcast_hops;
1066
1067                 dst = sk_dst_get(sk);
1068                 if (dst) {
1069                         if (val < 0)
1070                                 val = ip6_dst_hoplimit(dst);
1071                         dst_release(dst);
1072                 }
1073                 if (val < 0)
1074                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1075                 break;
1076         }
1077
1078         case IPV6_MULTICAST_LOOP:
1079                 val = np->mc_loop;
1080                 break;
1081
1082         case IPV6_MULTICAST_IF:
1083                 val = np->mcast_oif;
1084                 break;
1085
1086         case IPV6_MTU_DISCOVER:
1087                 val = np->pmtudisc;
1088                 break;
1089
1090         case IPV6_RECVERR:
1091                 val = np->recverr;
1092                 break;
1093
1094         case IPV6_FLOWINFO_SEND:
1095                 val = np->sndflow;
1096                 break;
1097
1098         case IPV6_ADDR_PREFERENCES:
1099                 val = 0;
1100
1101                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1102                         val |= IPV6_PREFER_SRC_TMP;
1103                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1104                         val |= IPV6_PREFER_SRC_PUBLIC;
1105                 else {
1106                         /* XXX: should we return system default? */
1107                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1108                 }
1109
1110                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1111                         val |= IPV6_PREFER_SRC_COA;
1112                 else
1113                         val |= IPV6_PREFER_SRC_HOME;
1114                 break;
1115
1116         default:
1117                 return -ENOPROTOOPT;
1118         }
1119         len = min_t(unsigned int, sizeof(int), len);
1120         if(put_user(len, optlen))
1121                 return -EFAULT;
1122         if(copy_to_user(optval,&val,len))
1123                 return -EFAULT;
1124         return 0;
1125 }
1126
1127 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1128                     char __user *optval, int __user *optlen)
1129 {
1130         int err;
1131
1132         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1133                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1134
1135         if(level != SOL_IPV6)
1136                 return -ENOPROTOOPT;
1137
1138         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1139 #ifdef CONFIG_NETFILTER
1140         /* we need to exclude all possible ENOPROTOOPTs except default case */
1141         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1142                 int len;
1143
1144                 if (get_user(len, optlen))
1145                         return -EFAULT;
1146
1147                 lock_sock(sk);
1148                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1149                                 &len);
1150                 release_sock(sk);
1151                 if (err >= 0)
1152                         err = put_user(len, optlen);
1153         }
1154 #endif
1155         return err;
1156 }
1157
1158 EXPORT_SYMBOL(ipv6_getsockopt);
1159
1160 #ifdef CONFIG_COMPAT
1161 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1162                            char __user *optval, int __user *optlen)
1163 {
1164         int err;
1165
1166         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1167                 if (udp_prot.compat_getsockopt != NULL)
1168                         return udp_prot.compat_getsockopt(sk, level, optname,
1169                                                           optval, optlen);
1170                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1171         }
1172
1173         if (level != SOL_IPV6)
1174                 return -ENOPROTOOPT;
1175
1176         if (optname == MCAST_MSFILTER)
1177                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1178                         ipv6_getsockopt);
1179
1180         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1181 #ifdef CONFIG_NETFILTER
1182         /* we need to exclude all possible ENOPROTOOPTs except default case */
1183         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1184                 int len;
1185
1186                 if (get_user(len, optlen))
1187                         return -EFAULT;
1188
1189                 lock_sock(sk);
1190                 err = compat_nf_getsockopt(sk, PF_INET6,
1191                                            optname, optval, &len);
1192                 release_sock(sk);
1193                 if (err >= 0)
1194                         err = put_user(len, optlen);
1195         }
1196 #endif
1197         return err;
1198 }
1199
1200 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1201 #endif
1202