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         int val, valbool;
 111         int retv = -ENOPROTOOPT;
 112
 113         if (optval == NULL)
 114                 val=0;
 115         else if (get_user(val, (int __user *) optval))
 116                 return -EFAULT;
 117
 118         valbool = (val!=0);
 119
 120         lock_sock(sk);
 121
 122         switch (optname) {
 123
 124         case IPV6_ADDRFORM:
 125                 if (val == PF_INET) {
 126                         struct ipv6_txoptions *opt;
 127                         struct sk_buff *pktopt;
 128
 129                         if (sk->sk_protocol != IPPROTO_UDP &&
 130 #ifdef CONFIG_IP_UDPLITE
 131                             sk->sk_protocol != IPPROTO_UDPLITE &&
 132 #endif
 133                             sk->sk_protocol != IPPROTO_TCP)
 134                                 break;
 135
 136                         if (sk->sk_state != TCP_ESTABLISHED) {
 137                                 retv = -ENOTCONN;
 138                                 break;
 139                         }
 140
 141                         if (ipv6_only_sock(sk) ||
 142                             !ipv6_addr_v4mapped(&np->daddr)) {
 143                                 retv = -EADDRNOTAVAIL;
 144                                 break;
 145                         }
 146
 147                         fl6_free_socklist(sk);
 148                         ipv6_sock_mc_close(sk);
 149
 150                         /*
 151                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 152                          * remove it from the refcnt debug socks count in the
 153                          * original family...
 154                          */
 155                         sk_refcnt_debug_dec(sk);
 156
 157                         if (sk->sk_protocol == IPPROTO_TCP) {
 158                                 struct inet_connection_sock *icsk = inet_csk(sk);
 159
 160                                 local_bh_disable();
 161                                 sock_prot_inuse_add(sk->sk_prot, -1);
 162                                 sock_prot_inuse_add(&tcp_prot, 1);
 163                                 local_bh_enable();
 164                                 sk->sk_prot = &tcp_prot;
 165                                 icsk->icsk_af_ops = &ipv4_specific;
 166                                 sk->sk_socket->ops = &inet_stream_ops;
 167                                 sk->sk_family = PF_INET;
 168                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 169                         } else {
 170                                 struct proto *prot = &udp_prot;
 171
 172                                 if (IS_PROTO_UDPLITE(sk->sk_protocol))
 173                                         prot = &udplite_prot;
 174                                 local_bh_disable();
 175                                 sock_prot_inuse_add(sk->sk_prot, -1);
 176                                 sock_prot_inuse_add(prot, 1);
 177                                 local_bh_enable();
 178                                 sk->sk_prot = prot;
 179                                 sk->sk_socket->ops = &inet_dgram_ops;
 180                                 sk->sk_family = PF_INET;
 181                         }
 182                         opt = xchg(&np->opt, NULL);
 183                         if (opt)
 184                                 sock_kfree_s(sk, opt, opt->tot_len);
 185                         pktopt = xchg(&np->pktoptions, NULL);
 186                         if (pktopt)
 187                                 kfree_skb(pktopt);
 188
 189                         sk->sk_destruct = inet_sock_destruct;
 190                         /*
 191                          * ... and add it to the refcnt debug socks count
 192                          * in the new family. -acme
 193                          */
 194                         sk_refcnt_debug_inc(sk);
 195                         module_put(THIS_MODULE);
 196                         retv = 0;
 197                         break;
 198                 }
 199                 goto e_inval;
 200
 201         case IPV6_V6ONLY:
 202                 if (inet_sk(sk)->num)
 203                         goto e_inval;
 204                 np->ipv6only = valbool;
 205                 retv = 0;
 206                 break;
 207
 208         case IPV6_RECVPKTINFO:
 209                 np->rxopt.bits.rxinfo = valbool;
 210                 retv = 0;
 211                 break;
 212
 213         case IPV6_2292PKTINFO:
 214                 np->rxopt.bits.rxoinfo = valbool;
 215                 retv = 0;
 216                 break;
 217
 218         case IPV6_RECVHOPLIMIT:
 219                 np->rxopt.bits.rxhlim = valbool;
 220                 retv = 0;
 221                 break;
 222
 223         case IPV6_2292HOPLIMIT:
 224                 np->rxopt.bits.rxohlim = valbool;
 225                 retv = 0;
 226                 break;
 227
 228         case IPV6_RECVRTHDR:
 229                 np->rxopt.bits.srcrt = valbool;
 230                 retv = 0;
 231                 break;
 232
 233         case IPV6_2292RTHDR:
 234                 np->rxopt.bits.osrcrt = valbool;
 235                 retv = 0;
 236                 break;
 237
 238         case IPV6_RECVHOPOPTS:
 239                 np->rxopt.bits.hopopts = valbool;
 240                 retv = 0;
 241                 break;
 242
 243         case IPV6_2292HOPOPTS:
 244                 np->rxopt.bits.ohopopts = valbool;
 245                 retv = 0;
 246                 break;
 247
 248         case IPV6_RECVDSTOPTS:
 249                 np->rxopt.bits.dstopts = valbool;
 250                 retv = 0;
 251                 break;
 252
 253         case IPV6_2292DSTOPTS:
 254                 np->rxopt.bits.odstopts = valbool;
 255                 retv = 0;
 256                 break;
 257
 258         case IPV6_TCLASS:
 259                 if (val < -1 || val > 0xff)
 260                         goto e_inval;
 261                 np->tclass = val;
 262                 retv = 0;
 263                 break;
 264
 265         case IPV6_RECVTCLASS:
 266                 np->rxopt.bits.rxtclass = valbool;
 267                 retv = 0;
 268                 break;
 269
 270         case IPV6_FLOWINFO:
 271                 np->rxopt.bits.rxflow = valbool;
 272                 retv = 0;
 273                 break;
 274
 275         case IPV6_HOPOPTS:
 276         case IPV6_RTHDRDSTOPTS:
 277         case IPV6_RTHDR:
 278         case IPV6_DSTOPTS:
 279         {
 280                 struct ipv6_txoptions *opt;
 281                 if (optlen == 0)
 282                         optval = NULL;
 283
 284                 /* hop-by-hop / destination options are privileged option */
 285                 retv = -EPERM;
 286                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 287                         break;
 288
 289                 retv = -EINVAL;
 290                 if (optlen & 0x7 || optlen > 8 * 255)
 291                         break;
 292
 293                 opt = ipv6_renew_options(sk, np->opt, optname,
 294                                          (struct ipv6_opt_hdr __user *)optval,
 295                                          optlen);
 296                 if (IS_ERR(opt)) {
 297                         retv = PTR_ERR(opt);
 298                         break;
 299                 }
 300
 301                 /* routing header option needs extra check */
 302                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 303                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 304                         switch (rthdr->type) {
 305 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 306                         case IPV6_SRCRT_TYPE_2:
 307                                 break;
 308 #endif
 309                         default:
 310                                 goto sticky_done;
 311                         }
 312
 313                         if ((rthdr->hdrlen & 1) ||
 314                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 315                                 goto sticky_done;
 316                 }
 317
 318                 retv = 0;
 319                 if (inet_sk(sk)->is_icsk) {
 320                         if (opt) {
 321                                 struct inet_connection_sock *icsk = inet_csk(sk);
 322                                 if (!((1 << sk->sk_state) &
 323                                       (TCPF_LISTEN | TCPF_CLOSE))
 324                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 325                                         icsk->icsk_ext_hdr_len =
 326                                                 opt->opt_flen + opt->opt_nflen;
 327                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 328                                 }
 329                         }
 330                         opt = xchg(&np->opt, opt);
 331                         sk_dst_reset(sk);
 332                 } else {
 333                         write_lock(&sk->sk_dst_lock);
 334                         opt = xchg(&np->opt, opt);
 335                         write_unlock(&sk->sk_dst_lock);
 336                         sk_dst_reset(sk);
 337                 }
 338 sticky_done:
 339                 if (opt)
 340                         sock_kfree_s(sk, opt, opt->tot_len);
 341                 break;
 342         }
 343
 344         case IPV6_2292PKTOPTIONS:
 345         {
 346                 struct ipv6_txoptions *opt = NULL;
 347                 struct msghdr msg;
 348                 struct flowi fl;
 349                 int junk;
 350
 351                 fl.fl6_flowlabel = 0;
 352                 fl.oif = sk->sk_bound_dev_if;
 353
 354                 if (optlen == 0)
 355                         goto update;
 356
 357                 /* 1K is probably excessive
 358                  * 1K is surely not enough, 2K per standard header is 16K.
 359                  */
 360                 retv = -EINVAL;
 361                 if (optlen > 64*1024)
 362                         break;
 363
 364                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 365                 retv = -ENOBUFS;
 366                 if (opt == NULL)
 367                         break;
 368
 369                 memset(opt, 0, sizeof(*opt));
 370                 opt->tot_len = sizeof(*opt) + optlen;
 371                 retv = -EFAULT;
 372                 if (copy_from_user(opt+1, optval, optlen))
 373                         goto done;
 374
 375                 msg.msg_controllen = optlen;
 376                 msg.msg_control = (void*)(opt+1);
 377
 378                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 379                 if (retv)
 380                         goto done;
 381 update:
 382                 retv = 0;
 383                 if (inet_sk(sk)->is_icsk) {
 384                         if (opt) {
 385                                 struct inet_connection_sock *icsk = inet_csk(sk);
 386                                 if (!((1 << sk->sk_state) &
 387                                       (TCPF_LISTEN | TCPF_CLOSE))
 388                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 389                                         icsk->icsk_ext_hdr_len =
 390                                                 opt->opt_flen + opt->opt_nflen;
 391                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 392                                 }
 393                         }
 394                         opt = xchg(&np->opt, opt);
 395                         sk_dst_reset(sk);
 396                 } else {
 397                         write_lock(&sk->sk_dst_lock);
 398                         opt = xchg(&np->opt, opt);
 399                         write_unlock(&sk->sk_dst_lock);
 400                         sk_dst_reset(sk);
 401                 }
 402
 403 done:
 404                 if (opt)
 405                         sock_kfree_s(sk, opt, opt->tot_len);
 406                 break;
 407         }
 408         case IPV6_UNICAST_HOPS:
 409                 if (val > 255 || val < -1)
 410                         goto e_inval;
 411                 np->hop_limit = val;
 412                 retv = 0;
 413                 break;
 414
 415         case IPV6_MULTICAST_HOPS:
 416                 if (sk->sk_type == SOCK_STREAM)
 417                         goto e_inval;
 418                 if (val > 255 || val < -1)
 419                         goto e_inval;
 420                 np->mcast_hops = val;
 421                 retv = 0;
 422                 break;
 423
 424         case IPV6_MULTICAST_LOOP:
 425                 np->mc_loop = valbool;
 426                 retv = 0;
 427                 break;
 428
 429         case IPV6_MULTICAST_IF:
 430                 if (sk->sk_type == SOCK_STREAM)
 431                         goto e_inval;
 432
 433                 if (val) {
 434                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 435                                 goto e_inval;
 436
 437                         if (__dev_get_by_index(&init_net, val) == NULL) {
 438                                 retv = -ENODEV;
 439                                 break;
 440                         }
 441                 }
 442                 np->mcast_oif = val;
 443                 retv = 0;
 444                 break;
 445         case IPV6_ADD_MEMBERSHIP:
 446         case IPV6_DROP_MEMBERSHIP:
 447         {
 448                 struct ipv6_mreq mreq;
 449
 450                 retv = -EPROTO;
 451                 if (inet_sk(sk)->is_icsk)
 452                         break;
 453
 454                 retv = -EFAULT;
 455                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 456                         break;
 457
 458                 if (optname == IPV6_ADD_MEMBERSHIP)
 459                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 460                 else
 461                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 462                 break;
 463         }
 464         case IPV6_JOIN_ANYCAST:
 465         case IPV6_LEAVE_ANYCAST:
 466         {
 467                 struct ipv6_mreq mreq;
 468
 469                 if (optlen != sizeof(struct ipv6_mreq))
 470                         goto e_inval;
 471
 472                 retv = -EFAULT;
 473                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 474                         break;
 475
 476                 if (optname == IPV6_JOIN_ANYCAST)
 477                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 478                 else
 479                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 480                 break;
 481         }
 482         case MCAST_JOIN_GROUP:
 483         case MCAST_LEAVE_GROUP:
 484         {
 485                 struct group_req greq;
 486                 struct sockaddr_in6 *psin6;
 487
 488                 retv = -EFAULT;
 489                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 490                         break;
 491                 if (greq.gr_group.ss_family != AF_INET6) {
 492                         retv = -EADDRNOTAVAIL;
 493                         break;
 494                 }
 495                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 496                 if (optname == MCAST_JOIN_GROUP)
 497                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 498                                 &psin6->sin6_addr);
 499                 else
 500                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 501                                 &psin6->sin6_addr);
 502                 break;
 503         }
 504         case MCAST_JOIN_SOURCE_GROUP:
 505         case MCAST_LEAVE_SOURCE_GROUP:
 506         case MCAST_BLOCK_SOURCE:
 507         case MCAST_UNBLOCK_SOURCE:
 508         {
 509                 struct group_source_req greqs;
 510                 int omode, add;
 511
 512                 if (optlen != sizeof(struct group_source_req))
 513                         goto e_inval;
 514                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 515                         retv = -EFAULT;
 516                         break;
 517                 }
 518                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 519                     greqs.gsr_source.ss_family != AF_INET6) {
 520                         retv = -EADDRNOTAVAIL;
 521                         break;
 522                 }
 523                 if (optname == MCAST_BLOCK_SOURCE) {
 524                         omode = MCAST_EXCLUDE;
 525                         add = 1;
 526                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 527                         omode = MCAST_EXCLUDE;
 528                         add = 0;
 529                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 530                         struct sockaddr_in6 *psin6;
 531
 532                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 533                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 534                                 &psin6->sin6_addr);
 535                         /* prior join w/ different source is ok */
 536                         if (retv && retv != -EADDRINUSE)
 537                                 break;
 538                         omode = MCAST_INCLUDE;
 539                         add = 1;
 540                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 541                         omode = MCAST_INCLUDE;
 542                         add = 0;
 543                 }
 544                 retv = ip6_mc_source(add, omode, sk, &greqs);
 545                 break;
 546         }
 547         case MCAST_MSFILTER:
 548         {
 549                 extern int sysctl_mld_max_msf;
 550                 struct group_filter *gsf;
 551
 552                 if (optlen < GROUP_FILTER_SIZE(0))
 553                         goto e_inval;
 554                 if (optlen > sysctl_optmem_max) {
 555                         retv = -ENOBUFS;
 556                         break;
 557                 }
 558                 gsf = kmalloc(optlen,GFP_KERNEL);
 559                 if (!gsf) {
 560                         retv = -ENOBUFS;
 561                         break;
 562                 }
 563                 retv = -EFAULT;
 564                 if (copy_from_user(gsf, optval, optlen)) {
 565                         kfree(gsf);
 566                         break;
 567                 }
 568                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 569                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 570                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 571                         kfree(gsf);
 572                         retv = -ENOBUFS;
 573                         break;
 574                 }
 575                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 576                         kfree(gsf);
 577                         retv = -EINVAL;
 578                         break;
 579                 }
 580                 retv = ip6_mc_msfilter(sk, gsf);
 581                 kfree(gsf);
 582
 583                 break;
 584         }
 585         case IPV6_ROUTER_ALERT:
 586                 retv = ip6_ra_control(sk, val, NULL);
 587                 break;
 588         case IPV6_MTU_DISCOVER:
 589                 if (val<0 || val>3)
 590                         goto e_inval;
 591                 np->pmtudisc = val;
 592                 retv = 0;
 593                 break;
 594         case IPV6_MTU:
 595                 if (val && val < IPV6_MIN_MTU)
 596                         goto e_inval;
 597                 np->frag_size = val;
 598                 retv = 0;
 599                 break;
 600         case IPV6_RECVERR:
 601                 np->recverr = valbool;
 602                 if (!val)
 603                         skb_queue_purge(&sk->sk_error_queue);
 604                 retv = 0;
 605                 break;
 606         case IPV6_FLOWINFO_SEND:
 607                 np->sndflow = valbool;
 608                 retv = 0;
 609                 break;
 610         case IPV6_FLOWLABEL_MGR:
 611                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 612                 break;
 613         case IPV6_IPSEC_POLICY:
 614         case IPV6_XFRM_POLICY:
 615                 retv = -EPERM;
 616                 if (!capable(CAP_NET_ADMIN))
 617                         break;
 618                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 619                 break;
 620
 621         }
 622         release_sock(sk);
 623
 624         return retv;
 625
 626 e_inval:
 627         release_sock(sk);
 628         return -EINVAL;
 629 }
 630
 631 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 632                     char __user *optval, int optlen)
 633 {
 634         int err;
 635
 636         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 637                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 638
 639         if (level != SOL_IPV6)
 640                 return -ENOPROTOOPT;
 641
 642         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 643 #ifdef CONFIG_NETFILTER
 644         /* we need to exclude all possible ENOPROTOOPTs except default case */
 645         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 646                         optname != IPV6_XFRM_POLICY) {
 647                 lock_sock(sk);
 648                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 649                                 optlen);
 650                 release_sock(sk);
 651         }
 652 #endif
 653         return err;
 654 }
 655
 656 EXPORT_SYMBOL(ipv6_setsockopt);
 657
 658 #ifdef CONFIG_COMPAT
 659 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 660                            char __user *optval, int optlen)
 661 {
 662         int err;
 663
 664         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 665                 if (udp_prot.compat_setsockopt != NULL)
 666                         return udp_prot.compat_setsockopt(sk, level, optname,
 667                                                           optval, optlen);
 668                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 669         }
 670
 671         if (level != SOL_IPV6)
 672                 return -ENOPROTOOPT;
 673
 674         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 675 #ifdef CONFIG_NETFILTER
 676         /* we need to exclude all possible ENOPROTOOPTs except default case */
 677         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 678             optname != IPV6_XFRM_POLICY) {
 679                 lock_sock(sk);
 680                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 681                                            optval, optlen);
 682                 release_sock(sk);
 683         }
 684 #endif
 685         return err;
 686 }
 687
 688 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 689 #endif
 690
 691 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 692                                   int optname, char __user *optval, int len)
 693 {
 694         struct ipv6_opt_hdr *hdr;
 695
 696         if (!opt)
 697                 return 0;
 698
 699         switch(optname) {
 700         case IPV6_HOPOPTS:
 701                 hdr = opt->hopopt;
 702                 break;
 703         case IPV6_RTHDRDSTOPTS:
 704                 hdr = opt->dst0opt;
 705                 break;
 706         case IPV6_RTHDR:
 707                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 708                 break;
 709         case IPV6_DSTOPTS:
 710                 hdr = opt->dst1opt;
 711                 break;
 712         default:
 713                 return -EINVAL; /* should not happen */
 714         }
 715
 716         if (!hdr)
 717                 return 0;
 718
 719         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 720         if (copy_to_user(optval, hdr, len))
 721                 return -EFAULT;
 722         return ipv6_optlen(hdr);
 723 }
 724
 725 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 726                     char __user *optval, int __user *optlen)
 727 {
 728         struct ipv6_pinfo *np = inet6_sk(sk);
 729         int len;
 730         int val;
 731
 732         if (get_user(len, optlen))
 733                 return -EFAULT;
 734         switch (optname) {
 735         case IPV6_ADDRFORM:
 736                 if (sk->sk_protocol != IPPROTO_UDP &&
 737 #ifdef CONFIG_IP_UDPLITE
 738                     sk->sk_protocol != IPPROTO_UDPLITE &&
 739 #endif
 740                     sk->sk_protocol != IPPROTO_TCP)
 741                         return -EINVAL;
 742                 if (sk->sk_state != TCP_ESTABLISHED)
 743                         return -ENOTCONN;
 744                 val = sk->sk_family;
 745                 break;
 746         case MCAST_MSFILTER:
 747         {
 748                 struct group_filter gsf;
 749                 int err;
 750
 751                 if (len < GROUP_FILTER_SIZE(0))
 752                         return -EINVAL;
 753                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 754                         return -EFAULT;
 755                 lock_sock(sk);
 756                 err = ip6_mc_msfget(sk, &gsf,
 757                         (struct group_filter __user *)optval, optlen);
 758                 release_sock(sk);
 759                 return err;
 760         }
 761
 762         case IPV6_2292PKTOPTIONS:
 763         {
 764                 struct msghdr msg;
 765                 struct sk_buff *skb;
 766
 767                 if (sk->sk_type != SOCK_STREAM)
 768                         return -ENOPROTOOPT;
 769
 770                 msg.msg_control = optval;
 771                 msg.msg_controllen = len;
 772                 msg.msg_flags = 0;
 773
 774                 lock_sock(sk);
 775                 skb = np->pktoptions;
 776                 if (skb)
 777                         atomic_inc(&skb->users);
 778                 release_sock(sk);
 779
 780                 if (skb) {
 781                         int err = datagram_recv_ctl(sk, &msg, skb);
 782                         kfree_skb(skb);
 783                         if (err)
 784                                 return err;
 785                 } else {
 786                         if (np->rxopt.bits.rxinfo) {
 787                                 struct in6_pktinfo src_info;
 788                                 src_info.ipi6_ifindex = np->mcast_oif;
 789                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 790                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 791                         }
 792                         if (np->rxopt.bits.rxhlim) {
 793                                 int hlim = np->mcast_hops;
 794                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 795                         }
 796                         if (np->rxopt.bits.rxoinfo) {
 797                                 struct in6_pktinfo src_info;
 798                                 src_info.ipi6_ifindex = np->mcast_oif;
 799                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 800                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 801                         }
 802                         if (np->rxopt.bits.rxohlim) {
 803                                 int hlim = np->mcast_hops;
 804                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 805                         }
 806                 }
 807                 len -= msg.msg_controllen;
 808                 return put_user(len, optlen);
 809         }
 810         case IPV6_MTU:
 811         {
 812                 struct dst_entry *dst;
 813                 val = 0;
 814                 lock_sock(sk);
 815                 dst = sk_dst_get(sk);
 816                 if (dst) {
 817                         val = dst_mtu(dst);
 818                         dst_release(dst);
 819                 }
 820                 release_sock(sk);
 821                 if (!val)
 822                         return -ENOTCONN;
 823                 break;
 824         }
 825
 826         case IPV6_V6ONLY:
 827                 val = np->ipv6only;
 828                 break;
 829
 830         case IPV6_RECVPKTINFO:
 831                 val = np->rxopt.bits.rxinfo;
 832                 break;
 833
 834         case IPV6_2292PKTINFO:
 835                 val = np->rxopt.bits.rxoinfo;
 836                 break;
 837
 838         case IPV6_RECVHOPLIMIT:
 839                 val = np->rxopt.bits.rxhlim;
 840                 break;
 841
 842         case IPV6_2292HOPLIMIT:
 843                 val = np->rxopt.bits.rxohlim;
 844                 break;
 845
 846         case IPV6_RECVRTHDR:
 847                 val = np->rxopt.bits.srcrt;
 848                 break;
 849
 850         case IPV6_2292RTHDR:
 851                 val = np->rxopt.bits.osrcrt;
 852                 break;
 853
 854         case IPV6_HOPOPTS:
 855         case IPV6_RTHDRDSTOPTS:
 856         case IPV6_RTHDR:
 857         case IPV6_DSTOPTS:
 858         {
 859
 860                 lock_sock(sk);
 861                 len = ipv6_getsockopt_sticky(sk, np->opt,
 862                                              optname, optval, len);
 863                 release_sock(sk);
 864                 return put_user(len, optlen);
 865         }
 866
 867         case IPV6_RECVHOPOPTS:
 868                 val = np->rxopt.bits.hopopts;
 869                 break;
 870
 871         case IPV6_2292HOPOPTS:
 872                 val = np->rxopt.bits.ohopopts;
 873                 break;
 874
 875         case IPV6_RECVDSTOPTS:
 876                 val = np->rxopt.bits.dstopts;
 877                 break;
 878
 879         case IPV6_2292DSTOPTS:
 880                 val = np->rxopt.bits.odstopts;
 881                 break;
 882
 883         case IPV6_TCLASS:
 884                 val = np->tclass;
 885                 if (val < 0)
 886                         val = 0;
 887                 break;
 888
 889         case IPV6_RECVTCLASS:
 890                 val = np->rxopt.bits.rxtclass;
 891                 break;
 892
 893         case IPV6_FLOWINFO:
 894                 val = np->rxopt.bits.rxflow;
 895                 break;
 896
 897         case IPV6_UNICAST_HOPS:
 898         case IPV6_MULTICAST_HOPS:
 899         {
 900                 struct dst_entry *dst;
 901
 902                 if (optname == IPV6_UNICAST_HOPS)
 903                         val = np->hop_limit;
 904                 else
 905                         val = np->mcast_hops;
 906
 907                 dst = sk_dst_get(sk);
 908                 if (dst) {
 909                         if (val < 0)
 910                                 val = dst_metric(dst, RTAX_HOPLIMIT);
 911                         if (val < 0)
 912                                 val = ipv6_get_hoplimit(dst->dev);
 913                         dst_release(dst);
 914                 }
 915                 if (val < 0)
 916                         val = ipv6_devconf.hop_limit;
 917                 break;
 918         }
 919
 920         case IPV6_MULTICAST_LOOP:
 921                 val = np->mc_loop;
 922                 break;
 923
 924         case IPV6_MULTICAST_IF:
 925                 val = np->mcast_oif;
 926                 break;
 927
 928         case IPV6_MTU_DISCOVER:
 929                 val = np->pmtudisc;
 930                 break;
 931
 932         case IPV6_RECVERR:
 933                 val = np->recverr;
 934                 break;
 935
 936         case IPV6_FLOWINFO_SEND:
 937                 val = np->sndflow;
 938                 break;
 939
 940         default:
 941                 return -ENOPROTOOPT;
 942         }
 943         len = min_t(unsigned int, sizeof(int), len);
 944         if(put_user(len, optlen))
 945                 return -EFAULT;
 946         if(copy_to_user(optval,&val,len))
 947                 return -EFAULT;
 948         return 0;
 949 }
 950
 951 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 952                     char __user *optval, int __user *optlen)
 953 {
 954         int err;
 955
 956         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 957                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 958
 959         if(level != SOL_IPV6)
 960                 return -ENOPROTOOPT;
 961
 962         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
 963 #ifdef CONFIG_NETFILTER
 964         /* we need to exclude all possible ENOPROTOOPTs except default case */
 965         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
 966                 int len;
 967
 968                 if (get_user(len, optlen))
 969                         return -EFAULT;
 970
 971                 lock_sock(sk);
 972                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
 973                                 &len);
 974                 release_sock(sk);
 975                 if (err >= 0)
 976                         err = put_user(len, optlen);
 977         }
 978 #endif
 979         return err;
 980 }
 981
 982 EXPORT_SYMBOL(ipv6_getsockopt);
 983
 984 #ifdef CONFIG_COMPAT
 985 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
 986                            char __user *optval, int __user *optlen)
 987 {
 988         int err;
 989
 990         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 991                 if (udp_prot.compat_getsockopt != NULL)
 992                         return udp_prot.compat_getsockopt(sk, level, optname,
 993                                                           optval, optlen);
 994                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 995         }
 996
 997         if (level != SOL_IPV6)
 998                 return -ENOPROTOOPT;
 999
1000         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1001 #ifdef CONFIG_NETFILTER
1002         /* we need to exclude all possible ENOPROTOOPTs except default case */
1003         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1004                 int len;
1005
1006                 if (get_user(len, optlen))
1007                         return -EFAULT;
1008
1009                 lock_sock(sk);
1010                 err = compat_nf_getsockopt(sk, PF_INET6,
1011                                            optname, optval, &len);
1012                 release_sock(sk);
1013                 if (err >= 0)
1014                         err = put_user(len, optlen);
1015         }
1016 #endif
1017         return err;
1018 }
1019
1020 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1021 #endif
1022