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 = sk->sk_net;
 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
 159                                 local_bh_disable();
 160                                 sock_prot_inuse_add(sk->sk_prot, -1);
 161                                 sock_prot_inuse_add(&tcp_prot, 1);
 162                                 local_bh_enable();
 163                                 sk->sk_prot = &tcp_prot;
 164                                 icsk->icsk_af_ops = &ipv4_specific;
 165                                 sk->sk_socket->ops = &inet_stream_ops;
 166                                 sk->sk_family = PF_INET;
 167                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 168                         } else {
 169                                 struct proto *prot = &udp_prot;
 170
 171                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 172                                         prot = &udplite_prot;
 173                                 local_bh_disable();
 174                                 sock_prot_inuse_add(sk->sk_prot, -1);
 175                                 sock_prot_inuse_add(prot, 1);
 176                                 local_bh_enable();
 177                                 sk->sk_prot = prot;
 178                                 sk->sk_socket->ops = &inet_dgram_ops;
 179                                 sk->sk_family = PF_INET;
 180                         }
 181                         opt = xchg(&np->opt, NULL);
 182                         if (opt)
 183                                 sock_kfree_s(sk, opt, opt->tot_len);
 184                         pktopt = xchg(&np->pktoptions, NULL);
 185                         if (pktopt)
 186                                 kfree_skb(pktopt);
 187
 188                         sk->sk_destruct = inet_sock_destruct;
 189                         /*
 190                          * ... and add it to the refcnt debug socks count
 191                          * in the new family. -acme
 192                          */
 193                         sk_refcnt_debug_inc(sk);
 194                         module_put(THIS_MODULE);
 195                         retv = 0;
 196                         break;
 197                 }
 198                 goto e_inval;
 199
 200         case IPV6_V6ONLY:
 201                 if (inet_sk(sk)->num)
 202                         goto e_inval;
 203                 np->ipv6only = valbool;
 204                 retv = 0;
 205                 break;
 206
 207         case IPV6_RECVPKTINFO:
 208                 np->rxopt.bits.rxinfo = valbool;
 209                 retv = 0;
 210                 break;
 211
 212         case IPV6_2292PKTINFO:
 213                 np->rxopt.bits.rxoinfo = valbool;
 214                 retv = 0;
 215                 break;
 216
 217         case IPV6_RECVHOPLIMIT:
 218                 np->rxopt.bits.rxhlim = valbool;
 219                 retv = 0;
 220                 break;
 221
 222         case IPV6_2292HOPLIMIT:
 223                 np->rxopt.bits.rxohlim = valbool;
 224                 retv = 0;
 225                 break;
 226
 227         case IPV6_RECVRTHDR:
 228                 np->rxopt.bits.srcrt = valbool;
 229                 retv = 0;
 230                 break;
 231
 232         case IPV6_2292RTHDR:
 233                 np->rxopt.bits.osrcrt = valbool;
 234                 retv = 0;
 235                 break;
 236
 237         case IPV6_RECVHOPOPTS:
 238                 np->rxopt.bits.hopopts = valbool;
 239                 retv = 0;
 240                 break;
 241
 242         case IPV6_2292HOPOPTS:
 243                 np->rxopt.bits.ohopopts = valbool;
 244                 retv = 0;
 245                 break;
 246
 247         case IPV6_RECVDSTOPTS:
 248                 np->rxopt.bits.dstopts = valbool;
 249                 retv = 0;
 250                 break;
 251
 252         case IPV6_2292DSTOPTS:
 253                 np->rxopt.bits.odstopts = valbool;
 254                 retv = 0;
 255                 break;
 256
 257         case IPV6_TCLASS:
 258                 if (val < -1 || val > 0xff)
 259                         goto e_inval;
 260                 np->tclass = val;
 261                 retv = 0;
 262                 break;
 263
 264         case IPV6_RECVTCLASS:
 265                 np->rxopt.bits.rxtclass = valbool;
 266                 retv = 0;
 267                 break;
 268
 269         case IPV6_FLOWINFO:
 270                 np->rxopt.bits.rxflow = valbool;
 271                 retv = 0;
 272                 break;
 273
 274         case IPV6_HOPOPTS:
 275         case IPV6_RTHDRDSTOPTS:
 276         case IPV6_RTHDR:
 277         case IPV6_DSTOPTS:
 278         {
 279                 struct ipv6_txoptions *opt;
 280                 if (optlen == 0)
 281                         optval = NULL;
 282
 283                 /* hop-by-hop / destination options are privileged option */
 284                 retv = -EPERM;
 285                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 286                         break;
 287
 288                 retv = -EINVAL;
 289                 if (optlen & 0x7 || optlen > 8 * 255)
 290                         break;
 291
 292                 opt = ipv6_renew_options(sk, np->opt, optname,
 293                                          (struct ipv6_opt_hdr __user *)optval,
 294                                          optlen);
 295                 if (IS_ERR(opt)) {
 296                         retv = PTR_ERR(opt);
 297                         break;
 298                 }
 299
 300                 /* routing header option needs extra check */
 301                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 302                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 303                         switch (rthdr->type) {
 304 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 305                         case IPV6_SRCRT_TYPE_2:
 306                                 break;
 307 #endif
 308                         default:
 309                                 goto sticky_done;
 310                         }
 311
 312                         if ((rthdr->hdrlen & 1) ||
 313                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 314                                 goto sticky_done;
 315                 }
 316
 317                 retv = 0;
 318                 if (inet_sk(sk)->is_icsk) {
 319                         if (opt) {
 320                                 struct inet_connection_sock *icsk = inet_csk(sk);
 321                                 if (!((1 << sk->sk_state) &
 322                                       (TCPF_LISTEN | TCPF_CLOSE))
 323                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 324                                         icsk->icsk_ext_hdr_len =
 325                                                 opt->opt_flen + opt->opt_nflen;
 326                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 327                                 }
 328                         }
 329                         opt = xchg(&np->opt, opt);
 330                         sk_dst_reset(sk);
 331                 } else {
 332                         write_lock(&sk->sk_dst_lock);
 333                         opt = xchg(&np->opt, opt);
 334                         write_unlock(&sk->sk_dst_lock);
 335                         sk_dst_reset(sk);
 336                 }
 337 sticky_done:
 338                 if (opt)
 339                         sock_kfree_s(sk, opt, opt->tot_len);
 340                 break;
 341         }
 342
 343         case IPV6_2292PKTOPTIONS:
 344         {
 345                 struct ipv6_txoptions *opt = NULL;
 346                 struct msghdr msg;
 347                 struct flowi fl;
 348                 int junk;
 349
 350                 fl.fl6_flowlabel = 0;
 351                 fl.oif = sk->sk_bound_dev_if;
 352
 353                 if (optlen == 0)
 354                         goto update;
 355
 356                 /* 1K is probably excessive
 357                  * 1K is surely not enough, 2K per standard header is 16K.
 358                  */
 359                 retv = -EINVAL;
 360                 if (optlen > 64*1024)
 361                         break;
 362
 363                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 364                 retv = -ENOBUFS;
 365                 if (opt == NULL)
 366                         break;
 367
 368                 memset(opt, 0, sizeof(*opt));
 369                 opt->tot_len = sizeof(*opt) + optlen;
 370                 retv = -EFAULT;
 371                 if (copy_from_user(opt+1, optval, optlen))
 372                         goto done;
 373
 374                 msg.msg_controllen = optlen;
 375                 msg.msg_control = (void*)(opt+1);
 376
 377                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 378                 if (retv)
 379                         goto done;
 380 update:
 381                 retv = 0;
 382                 if (inet_sk(sk)->is_icsk) {
 383                         if (opt) {
 384                                 struct inet_connection_sock *icsk = inet_csk(sk);
 385                                 if (!((1 << sk->sk_state) &
 386                                       (TCPF_LISTEN | TCPF_CLOSE))
 387                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 388                                         icsk->icsk_ext_hdr_len =
 389                                                 opt->opt_flen + opt->opt_nflen;
 390                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 391                                 }
 392                         }
 393                         opt = xchg(&np->opt, opt);
 394                         sk_dst_reset(sk);
 395                 } else {
 396                         write_lock(&sk->sk_dst_lock);
 397                         opt = xchg(&np->opt, opt);
 398                         write_unlock(&sk->sk_dst_lock);
 399                         sk_dst_reset(sk);
 400                 }
 401
 402 done:
 403                 if (opt)
 404                         sock_kfree_s(sk, opt, opt->tot_len);
 405                 break;
 406         }
 407         case IPV6_UNICAST_HOPS:
 408                 if (val > 255 || val < -1)
 409                         goto e_inval;
 410                 np->hop_limit = val;
 411                 retv = 0;
 412                 break;
 413
 414         case IPV6_MULTICAST_HOPS:
 415                 if (sk->sk_type == SOCK_STREAM)
 416                         goto e_inval;
 417                 if (val > 255 || val < -1)
 418                         goto e_inval;
 419                 np->mcast_hops = val;
 420                 retv = 0;
 421                 break;
 422
 423         case IPV6_MULTICAST_LOOP:
 424                 np->mc_loop = valbool;
 425                 retv = 0;
 426                 break;
 427
 428         case IPV6_MULTICAST_IF:
 429                 if (sk->sk_type == SOCK_STREAM)
 430                         goto e_inval;
 431
 432                 if (val) {
 433                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 434                                 goto e_inval;
 435
 436                         if (__dev_get_by_index(net, val) == NULL) {
 437                                 retv = -ENODEV;
 438                                 break;
 439                         }
 440                 }
 441                 np->mcast_oif = val;
 442                 retv = 0;
 443                 break;
 444         case IPV6_ADD_MEMBERSHIP:
 445         case IPV6_DROP_MEMBERSHIP:
 446         {
 447                 struct ipv6_mreq mreq;
 448
 449                 retv = -EPROTO;
 450                 if (inet_sk(sk)->is_icsk)
 451                         break;
 452
 453                 retv = -EFAULT;
 454                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 455                         break;
 456
 457                 if (optname == IPV6_ADD_MEMBERSHIP)
 458                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 459                 else
 460                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 461                 break;
 462         }
 463         case IPV6_JOIN_ANYCAST:
 464         case IPV6_LEAVE_ANYCAST:
 465         {
 466                 struct ipv6_mreq mreq;
 467
 468                 if (optlen != sizeof(struct ipv6_mreq))
 469                         goto e_inval;
 470
 471                 retv = -EFAULT;
 472                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 473                         break;
 474
 475                 if (optname == IPV6_JOIN_ANYCAST)
 476                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 477                 else
 478                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 479                 break;
 480         }
 481         case MCAST_JOIN_GROUP:
 482         case MCAST_LEAVE_GROUP:
 483         {
 484                 struct group_req greq;
 485                 struct sockaddr_in6 *psin6;
 486
 487                 retv = -EFAULT;
 488                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 489                         break;
 490                 if (greq.gr_group.ss_family != AF_INET6) {
 491                         retv = -EADDRNOTAVAIL;
 492                         break;
 493                 }
 494                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 495                 if (optname == MCAST_JOIN_GROUP)
 496                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 497                                 &psin6->sin6_addr);
 498                 else
 499                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 500                                 &psin6->sin6_addr);
 501                 break;
 502         }
 503         case MCAST_JOIN_SOURCE_GROUP:
 504         case MCAST_LEAVE_SOURCE_GROUP:
 505         case MCAST_BLOCK_SOURCE:
 506         case MCAST_UNBLOCK_SOURCE:
 507         {
 508                 struct group_source_req greqs;
 509                 int omode, add;
 510
 511                 if (optlen != sizeof(struct group_source_req))
 512                         goto e_inval;
 513                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 514                         retv = -EFAULT;
 515                         break;
 516                 }
 517                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 518                     greqs.gsr_source.ss_family != AF_INET6) {
 519                         retv = -EADDRNOTAVAIL;
 520                         break;
 521                 }
 522                 if (optname == MCAST_BLOCK_SOURCE) {
 523                         omode = MCAST_EXCLUDE;
 524                         add = 1;
 525                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 526                         omode = MCAST_EXCLUDE;
 527                         add = 0;
 528                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 529                         struct sockaddr_in6 *psin6;
 530
 531                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 532                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 533                                 &psin6->sin6_addr);
 534                         /* prior join w/ different source is ok */
 535                         if (retv && retv != -EADDRINUSE)
 536                                 break;
 537                         omode = MCAST_INCLUDE;
 538                         add = 1;
 539                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 540                         omode = MCAST_INCLUDE;
 541                         add = 0;
 542                 }
 543                 retv = ip6_mc_source(add, omode, sk, &greqs);
 544                 break;
 545         }
 546         case MCAST_MSFILTER:
 547         {
 548                 extern int sysctl_mld_max_msf;
 549                 struct group_filter *gsf;
 550
 551                 if (optlen < GROUP_FILTER_SIZE(0))
 552                         goto e_inval;
 553                 if (optlen > sysctl_optmem_max) {
 554                         retv = -ENOBUFS;
 555                         break;
 556                 }
 557                 gsf = kmalloc(optlen,GFP_KERNEL);
 558                 if (!gsf) {
 559                         retv = -ENOBUFS;
 560                         break;
 561                 }
 562                 retv = -EFAULT;
 563                 if (copy_from_user(gsf, optval, optlen)) {
 564                         kfree(gsf);
 565                         break;
 566                 }
 567                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 568                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 569                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 570                         kfree(gsf);
 571                         retv = -ENOBUFS;
 572                         break;
 573                 }
 574                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 575                         kfree(gsf);
 576                         retv = -EINVAL;
 577                         break;
 578                 }
 579                 retv = ip6_mc_msfilter(sk, gsf);
 580                 kfree(gsf);
 581
 582                 break;
 583         }
 584         case IPV6_ROUTER_ALERT:
 585                 retv = ip6_ra_control(sk, val, NULL);
 586                 break;
 587         case IPV6_MTU_DISCOVER:
 588                 if (val<0 || val>3)
 589                         goto e_inval;
 590                 np->pmtudisc = val;
 591                 retv = 0;
 592                 break;
 593         case IPV6_MTU:
 594                 if (val && val < IPV6_MIN_MTU)
 595                         goto e_inval;
 596                 np->frag_size = val;
 597                 retv = 0;
 598                 break;
 599         case IPV6_RECVERR:
 600                 np->recverr = valbool;
 601                 if (!val)
 602                         skb_queue_purge(&sk->sk_error_queue);
 603                 retv = 0;
 604                 break;
 605         case IPV6_FLOWINFO_SEND:
 606                 np->sndflow = valbool;
 607                 retv = 0;
 608                 break;
 609         case IPV6_FLOWLABEL_MGR:
 610                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 611                 break;
 612         case IPV6_IPSEC_POLICY:
 613         case IPV6_XFRM_POLICY:
 614                 retv = -EPERM;
 615                 if (!capable(CAP_NET_ADMIN))
 616                         break;
 617                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 618                 break;
 619
 620         }
 621         release_sock(sk);
 622
 623         return retv;
 624
 625 e_inval:
 626         release_sock(sk);
 627         return -EINVAL;
 628 }
 629
 630 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 631                     char __user *optval, int optlen)
 632 {
 633         int err;
 634
 635         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 636                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 637
 638         if (level != SOL_IPV6)
 639                 return -ENOPROTOOPT;
 640
 641         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 642 #ifdef CONFIG_NETFILTER
 643         /* we need to exclude all possible ENOPROTOOPTs except default case */
 644         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 645                         optname != IPV6_XFRM_POLICY) {
 646                 lock_sock(sk);
 647                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 648                                 optlen);
 649                 release_sock(sk);
 650         }
 651 #endif
 652         return err;
 653 }
 654
 655 EXPORT_SYMBOL(ipv6_setsockopt);
 656
 657 #ifdef CONFIG_COMPAT
 658 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 659                            char __user *optval, int optlen)
 660 {
 661         int err;
 662
 663         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 664                 if (udp_prot.compat_setsockopt != NULL)
 665                         return udp_prot.compat_setsockopt(sk, level, optname,
 666                                                           optval, optlen);
 667                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 668         }
 669
 670         if (level != SOL_IPV6)
 671                 return -ENOPROTOOPT;
 672
 673         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 674 #ifdef CONFIG_NETFILTER
 675         /* we need to exclude all possible ENOPROTOOPTs except default case */
 676         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 677             optname != IPV6_XFRM_POLICY) {
 678                 lock_sock(sk);
 679                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 680                                            optval, optlen);
 681                 release_sock(sk);
 682         }
 683 #endif
 684         return err;
 685 }
 686
 687 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 688 #endif
 689
 690 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 691                                   int optname, char __user *optval, int len)
 692 {
 693         struct ipv6_opt_hdr *hdr;
 694
 695         if (!opt)
 696                 return 0;
 697
 698         switch(optname) {
 699         case IPV6_HOPOPTS:
 700                 hdr = opt->hopopt;
 701                 break;
 702         case IPV6_RTHDRDSTOPTS:
 703                 hdr = opt->dst0opt;
 704                 break;
 705         case IPV6_RTHDR:
 706                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 707                 break;
 708         case IPV6_DSTOPTS:
 709                 hdr = opt->dst1opt;
 710                 break;
 711         default:
 712                 return -EINVAL; /* should not happen */
 713         }
 714
 715         if (!hdr)
 716                 return 0;
 717
 718         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 719         if (copy_to_user(optval, hdr, len))
 720                 return -EFAULT;
 721         return ipv6_optlen(hdr);
 722 }
 723
 724 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 725                     char __user *optval, int __user *optlen)
 726 {
 727         struct ipv6_pinfo *np = inet6_sk(sk);
 728         int len;
 729         int val;
 730
 731         if (get_user(len, optlen))
 732                 return -EFAULT;
 733         switch (optname) {
 734         case IPV6_ADDRFORM:
 735                 if (sk->sk_protocol != IPPROTO_UDP &&
 736                     sk->sk_protocol != IPPROTO_UDPLITE &&
 737                     sk->sk_protocol != IPPROTO_TCP)
 738                         return -EINVAL;
 739                 if (sk->sk_state != TCP_ESTABLISHED)
 740                         return -ENOTCONN;
 741                 val = sk->sk_family;
 742                 break;
 743         case MCAST_MSFILTER:
 744         {
 745                 struct group_filter gsf;
 746                 int err;
 747
 748                 if (len < GROUP_FILTER_SIZE(0))
 749                         return -EINVAL;
 750                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 751                         return -EFAULT;
 752                 lock_sock(sk);
 753                 err = ip6_mc_msfget(sk, &gsf,
 754                         (struct group_filter __user *)optval, optlen);
 755                 release_sock(sk);
 756                 return err;
 757         }
 758
 759         case IPV6_2292PKTOPTIONS:
 760         {
 761                 struct msghdr msg;
 762                 struct sk_buff *skb;
 763
 764                 if (sk->sk_type != SOCK_STREAM)
 765                         return -ENOPROTOOPT;
 766
 767                 msg.msg_control = optval;
 768                 msg.msg_controllen = len;
 769                 msg.msg_flags = 0;
 770
 771                 lock_sock(sk);
 772                 skb = np->pktoptions;
 773                 if (skb)
 774                         atomic_inc(&skb->users);
 775                 release_sock(sk);
 776
 777                 if (skb) {
 778                         int err = datagram_recv_ctl(sk, &msg, skb);
 779                         kfree_skb(skb);
 780                         if (err)
 781                                 return err;
 782                 } else {
 783                         if (np->rxopt.bits.rxinfo) {
 784                                 struct in6_pktinfo src_info;
 785                                 src_info.ipi6_ifindex = np->mcast_oif;
 786                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 787                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 788                         }
 789                         if (np->rxopt.bits.rxhlim) {
 790                                 int hlim = np->mcast_hops;
 791                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 792                         }
 793                         if (np->rxopt.bits.rxoinfo) {
 794                                 struct in6_pktinfo src_info;
 795                                 src_info.ipi6_ifindex = np->mcast_oif;
 796                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 797                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 798                         }
 799                         if (np->rxopt.bits.rxohlim) {
 800                                 int hlim = np->mcast_hops;
 801                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 802                         }
 803                 }
 804                 len -= msg.msg_controllen;
 805                 return put_user(len, optlen);
 806         }
 807         case IPV6_MTU:
 808         {
 809                 struct dst_entry *dst;
 810                 val = 0;
 811                 lock_sock(sk);
 812                 dst = sk_dst_get(sk);
 813                 if (dst) {
 814                         val = dst_mtu(dst);
 815                         dst_release(dst);
 816                 }
 817                 release_sock(sk);
 818                 if (!val)
 819                         return -ENOTCONN;
 820                 break;
 821         }
 822
 823         case IPV6_V6ONLY:
 824                 val = np->ipv6only;
 825                 break;
 826
 827         case IPV6_RECVPKTINFO:
 828                 val = np->rxopt.bits.rxinfo;
 829                 break;
 830
 831         case IPV6_2292PKTINFO:
 832                 val = np->rxopt.bits.rxoinfo;
 833                 break;
 834
 835         case IPV6_RECVHOPLIMIT:
 836                 val = np->rxopt.bits.rxhlim;
 837                 break;
 838
 839         case IPV6_2292HOPLIMIT:
 840                 val = np->rxopt.bits.rxohlim;
 841                 break;
 842
 843         case IPV6_RECVRTHDR:
 844                 val = np->rxopt.bits.srcrt;
 845                 break;
 846
 847         case IPV6_2292RTHDR:
 848                 val = np->rxopt.bits.osrcrt;
 849                 break;
 850
 851         case IPV6_HOPOPTS:
 852         case IPV6_RTHDRDSTOPTS:
 853         case IPV6_RTHDR:
 854         case IPV6_DSTOPTS:
 855         {
 856
 857                 lock_sock(sk);
 858                 len = ipv6_getsockopt_sticky(sk, np->opt,
 859                                              optname, optval, len);
 860                 release_sock(sk);
 861                 return put_user(len, optlen);
 862         }
 863
 864         case IPV6_RECVHOPOPTS:
 865                 val = np->rxopt.bits.hopopts;
 866                 break;
 867
 868         case IPV6_2292HOPOPTS:
 869                 val = np->rxopt.bits.ohopopts;
 870                 break;
 871
 872         case IPV6_RECVDSTOPTS:
 873                 val = np->rxopt.bits.dstopts;
 874                 break;
 875
 876         case IPV6_2292DSTOPTS:
 877                 val = np->rxopt.bits.odstopts;
 878                 break;
 879
 880         case IPV6_TCLASS:
 881                 val = np->tclass;
 882                 if (val < 0)
 883                         val = 0;
 884                 break;
 885
 886         case IPV6_RECVTCLASS:
 887                 val = np->rxopt.bits.rxtclass;
 888                 break;
 889
 890         case IPV6_FLOWINFO:
 891                 val = np->rxopt.bits.rxflow;
 892                 break;
 893
 894         case IPV6_UNICAST_HOPS:
 895         case IPV6_MULTICAST_HOPS:
 896         {
 897                 struct dst_entry *dst;
 898
 899                 if (optname == IPV6_UNICAST_HOPS)
 900                         val = np->hop_limit;
 901                 else
 902                         val = np->mcast_hops;
 903
 904                 dst = sk_dst_get(sk);
 905                 if (dst) {
 906                         if (val < 0)
 907                                 val = ip6_dst_hoplimit(dst);
 908                         dst_release(dst);
 909                 }
 910                 if (val < 0)
 911                         val = ipv6_devconf.hop_limit;
 912                 break;
 913         }
 914
 915         case IPV6_MULTICAST_LOOP:
 916                 val = np->mc_loop;
 917                 break;
 918
 919         case IPV6_MULTICAST_IF:
 920                 val = np->mcast_oif;
 921                 break;
 922
 923         case IPV6_MTU_DISCOVER:
 924                 val = np->pmtudisc;
 925                 break;
 926
 927         case IPV6_RECVERR:
 928                 val = np->recverr;
 929                 break;
 930
 931         case IPV6_FLOWINFO_SEND:
 932                 val = np->sndflow;
 933                 break;
 934
 935         default:
 936                 return -ENOPROTOOPT;
 937         }
 938         len = min_t(unsigned int, sizeof(int), len);
 939         if(put_user(len, optlen))
 940                 return -EFAULT;
 941         if(copy_to_user(optval,&val,len))
 942                 return -EFAULT;
 943         return 0;
 944 }
 945
 946 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 947                     char __user *optval, int __user *optlen)
 948 {
 949         int err;
 950
 951         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 952                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 953
 954         if(level != SOL_IPV6)
 955                 return -ENOPROTOOPT;
 956
 957         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
 958 #ifdef CONFIG_NETFILTER
 959         /* we need to exclude all possible ENOPROTOOPTs except default case */
 960         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
 961                 int len;
 962
 963                 if (get_user(len, optlen))
 964                         return -EFAULT;
 965
 966                 lock_sock(sk);
 967                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
 968                                 &len);
 969                 release_sock(sk);
 970                 if (err >= 0)
 971                         err = put_user(len, optlen);
 972         }
 973 #endif
 974         return err;
 975 }
 976
 977 EXPORT_SYMBOL(ipv6_getsockopt);
 978
 979 #ifdef CONFIG_COMPAT
 980 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
 981                            char __user *optval, int __user *optlen)
 982 {
 983         int err;
 984
 985         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 986                 if (udp_prot.compat_getsockopt != NULL)
 987                         return udp_prot.compat_getsockopt(sk, level, optname,
 988                                                           optval, optlen);
 989                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 990         }
 991
 992         if (level != SOL_IPV6)
 993                 return -ENOPROTOOPT;
 994
 995         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
 996 #ifdef CONFIG_NETFILTER
 997         /* we need to exclude all possible ENOPROTOOPTs except default case */
 998         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
 999                 int len;
1000
1001                 if (get_user(len, optlen))
1002                         return -EFAULT;
1003
1004                 lock_sock(sk);
1005                 err = compat_nf_getsockopt(sk, PF_INET6,
1006                                            optname, optval, &len);
1007                 release_sock(sk);
1008                 if (err >= 0)
1009                         err = put_user(len, optlen);
1010         }
1011 #endif
1012         return err;
1013 }
1014
1015 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1016 #endif
1017