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/mroute6.h>
  37 #include <linux/netdevice.h>
  38 #include <linux/if_arp.h>
  39 #include <linux/init.h>
  40 #include <linux/sysctl.h>
  41 #include <linux/netfilter.h>
  42
  43 #include <net/sock.h>
  44 #include <net/snmp.h>
  45 #include <net/ipv6.h>
  46 #include <net/ndisc.h>
  47 #include <net/protocol.h>
  48 #include <net/transp_v6.h>
  49 #include <net/ip6_route.h>
  50 #include <net/addrconf.h>
  51 #include <net/inet_common.h>
  52 #include <net/tcp.h>
  53 #include <net/udp.h>
  54 #include <net/udplite.h>
  55 #include <net/xfrm.h>
  56
  57 #include <asm/uaccess.h>
  58
  59 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  60
  61 struct ip6_ra_chain *ip6_ra_chain;
  62 DEFINE_RWLOCK(ip6_ra_lock);
  63
  64 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
  65 {
  66         struct ip6_ra_chain *ra, *new_ra, **rap;
  67
  68         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  69         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
  70                 return -EINVAL;
  71
  72         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  73
  74         write_lock_bh(&ip6_ra_lock);
  75         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  76                 if (ra->sk == sk) {
  77                         if (sel>=0) {
  78                                 write_unlock_bh(&ip6_ra_lock);
  79                                 kfree(new_ra);
  80                                 return -EADDRINUSE;
  81                         }
  82
  83                         *rap = ra->next;
  84                         write_unlock_bh(&ip6_ra_lock);
  85
  86                         if (ra->destructor)
  87                                 ra->destructor(sk);
  88                         sock_put(sk);
  89                         kfree(ra);
  90                         return 0;
  91                 }
  92         }
  93         if (new_ra == NULL) {
  94                 write_unlock_bh(&ip6_ra_lock);
  95                 return -ENOBUFS;
  96         }
  97         new_ra->sk = sk;
  98         new_ra->sel = sel;
  99         new_ra->destructor = destructor;
 100         new_ra->next = ra;
 101         *rap = new_ra;
 102         sock_hold(sk);
 103         write_unlock_bh(&ip6_ra_lock);
 104         return 0;
 105 }
 106
 107 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 108                     char __user *optval, int optlen)
 109 {
 110         struct ipv6_pinfo *np = inet6_sk(sk);
 111         struct net *net = sock_net(sk);
 112         int val, valbool;
 113         int retv = -ENOPROTOOPT;
 114
 115         if (optval == NULL)
 116                 val=0;
 117         else if (get_user(val, (int __user *) optval))
 118                 return -EFAULT;
 119
 120         valbool = (val!=0);
 121
 122         if (ip6_mroute_opt(optname))
 123                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 124
 125         lock_sock(sk);
 126
 127         switch (optname) {
 128
 129         case IPV6_ADDRFORM:
 130                 if (val == PF_INET) {
 131                         struct ipv6_txoptions *opt;
 132                         struct sk_buff *pktopt;
 133
 134                         if (sk->sk_protocol != IPPROTO_UDP &&
 135                             sk->sk_protocol != IPPROTO_UDPLITE &&
 136                             sk->sk_protocol != IPPROTO_TCP)
 137                                 break;
 138
 139                         if (sk->sk_state != TCP_ESTABLISHED) {
 140                                 retv = -ENOTCONN;
 141                                 break;
 142                         }
 143
 144                         if (ipv6_only_sock(sk) ||
 145                             !ipv6_addr_v4mapped(&np->daddr)) {
 146                                 retv = -EADDRNOTAVAIL;
 147                                 break;
 148                         }
 149
 150                         fl6_free_socklist(sk);
 151                         ipv6_sock_mc_close(sk);
 152
 153                         /*
 154                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 155                          * remove it from the refcnt debug socks count in the
 156                          * original family...
 157                          */
 158                         sk_refcnt_debug_dec(sk);
 159
 160                         if (sk->sk_protocol == IPPROTO_TCP) {
 161                                 struct inet_connection_sock *icsk = inet_csk(sk);
 162                                 local_bh_disable();
 163                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 164                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 165                                 local_bh_enable();
 166                                 sk->sk_prot = &tcp_prot;
 167                                 icsk->icsk_af_ops = &ipv4_specific;
 168                                 sk->sk_socket->ops = &inet_stream_ops;
 169                                 sk->sk_family = PF_INET;
 170                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 171                         } else {
 172                                 struct proto *prot = &udp_prot;
 173
 174                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 175                                         prot = &udplite_prot;
 176                                 local_bh_disable();
 177                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 178                                 sock_prot_inuse_add(net, prot, 1);
 179                                 local_bh_enable();
 180                                 sk->sk_prot = prot;
 181                                 sk->sk_socket->ops = &inet_dgram_ops;
 182                                 sk->sk_family = PF_INET;
 183                         }
 184                         opt = xchg(&np->opt, NULL);
 185                         if (opt)
 186                                 sock_kfree_s(sk, opt, opt->tot_len);
 187                         pktopt = xchg(&np->pktoptions, NULL);
 188                         if (pktopt)
 189                                 kfree_skb(pktopt);
 190
 191                         sk->sk_destruct = inet_sock_destruct;
 192                         /*
 193                          * ... and add it to the refcnt debug socks count
 194                          * in the new family. -acme
 195                          */
 196                         sk_refcnt_debug_inc(sk);
 197                         module_put(THIS_MODULE);
 198                         retv = 0;
 199                         break;
 200                 }
 201                 goto e_inval;
 202
 203         case IPV6_V6ONLY:
 204                 if (inet_sk(sk)->num)
 205                         goto e_inval;
 206                 np->ipv6only = valbool;
 207                 retv = 0;
 208                 break;
 209
 210         case IPV6_RECVPKTINFO:
 211                 np->rxopt.bits.rxinfo = valbool;
 212                 retv = 0;
 213                 break;
 214
 215         case IPV6_2292PKTINFO:
 216                 np->rxopt.bits.rxoinfo = valbool;
 217                 retv = 0;
 218                 break;
 219
 220         case IPV6_RECVHOPLIMIT:
 221                 np->rxopt.bits.rxhlim = valbool;
 222                 retv = 0;
 223                 break;
 224
 225         case IPV6_2292HOPLIMIT:
 226                 np->rxopt.bits.rxohlim = valbool;
 227                 retv = 0;
 228                 break;
 229
 230         case IPV6_RECVRTHDR:
 231                 np->rxopt.bits.srcrt = valbool;
 232                 retv = 0;
 233                 break;
 234
 235         case IPV6_2292RTHDR:
 236                 np->rxopt.bits.osrcrt = valbool;
 237                 retv = 0;
 238                 break;
 239
 240         case IPV6_RECVHOPOPTS:
 241                 np->rxopt.bits.hopopts = valbool;
 242                 retv = 0;
 243                 break;
 244
 245         case IPV6_2292HOPOPTS:
 246                 np->rxopt.bits.ohopopts = valbool;
 247                 retv = 0;
 248                 break;
 249
 250         case IPV6_RECVDSTOPTS:
 251                 np->rxopt.bits.dstopts = valbool;
 252                 retv = 0;
 253                 break;
 254
 255         case IPV6_2292DSTOPTS:
 256                 np->rxopt.bits.odstopts = valbool;
 257                 retv = 0;
 258                 break;
 259
 260         case IPV6_TCLASS:
 261                 if (val < -1 || val > 0xff)
 262                         goto e_inval;
 263                 np->tclass = val;
 264                 retv = 0;
 265                 break;
 266
 267         case IPV6_RECVTCLASS:
 268                 np->rxopt.bits.rxtclass = valbool;
 269                 retv = 0;
 270                 break;
 271
 272         case IPV6_FLOWINFO:
 273                 np->rxopt.bits.rxflow = valbool;
 274                 retv = 0;
 275                 break;
 276
 277         case IPV6_HOPOPTS:
 278         case IPV6_RTHDRDSTOPTS:
 279         case IPV6_RTHDR:
 280         case IPV6_DSTOPTS:
 281         {
 282                 struct ipv6_txoptions *opt;
 283                 if (optlen == 0)
 284                         optval = NULL;
 285
 286                 /* hop-by-hop / destination options are privileged option */
 287                 retv = -EPERM;
 288                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 289                         break;
 290
 291                 retv = -EINVAL;
 292                 if (optlen & 0x7 || optlen > 8 * 255)
 293                         break;
 294
 295                 opt = ipv6_renew_options(sk, np->opt, optname,
 296                                          (struct ipv6_opt_hdr __user *)optval,
 297                                          optlen);
 298                 if (IS_ERR(opt)) {
 299                         retv = PTR_ERR(opt);
 300                         break;
 301                 }
 302
 303                 /* routing header option needs extra check */
 304                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 305                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 306                         switch (rthdr->type) {
 307 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 308                         case IPV6_SRCRT_TYPE_2:
 309                                 break;
 310 #endif
 311                         default:
 312                                 goto sticky_done;
 313                         }
 314
 315                         if ((rthdr->hdrlen & 1) ||
 316                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 317                                 goto sticky_done;
 318                 }
 319
 320                 retv = 0;
 321                 if (inet_sk(sk)->is_icsk) {
 322                         if (opt) {
 323                                 struct inet_connection_sock *icsk = inet_csk(sk);
 324                                 if (!((1 << sk->sk_state) &
 325                                       (TCPF_LISTEN | TCPF_CLOSE))
 326                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 327                                         icsk->icsk_ext_hdr_len =
 328                                                 opt->opt_flen + opt->opt_nflen;
 329                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 330                                 }
 331                         }
 332                         opt = xchg(&np->opt, opt);
 333                         sk_dst_reset(sk);
 334                 } else {
 335                         write_lock(&sk->sk_dst_lock);
 336                         opt = xchg(&np->opt, opt);
 337                         write_unlock(&sk->sk_dst_lock);
 338                         sk_dst_reset(sk);
 339                 }
 340 sticky_done:
 341                 if (opt)
 342                         sock_kfree_s(sk, opt, opt->tot_len);
 343                 break;
 344         }
 345
 346         case IPV6_2292PKTOPTIONS:
 347         {
 348                 struct ipv6_txoptions *opt = NULL;
 349                 struct msghdr msg;
 350                 struct flowi fl;
 351                 int junk;
 352
 353                 fl.fl6_flowlabel = 0;
 354                 fl.oif = sk->sk_bound_dev_if;
 355
 356                 if (optlen == 0)
 357                         goto update;
 358
 359                 /* 1K is probably excessive
 360                  * 1K is surely not enough, 2K per standard header is 16K.
 361                  */
 362                 retv = -EINVAL;
 363                 if (optlen > 64*1024)
 364                         break;
 365
 366                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 367                 retv = -ENOBUFS;
 368                 if (opt == NULL)
 369                         break;
 370
 371                 memset(opt, 0, sizeof(*opt));
 372                 opt->tot_len = sizeof(*opt) + optlen;
 373                 retv = -EFAULT;
 374                 if (copy_from_user(opt+1, optval, optlen))
 375                         goto done;
 376
 377                 msg.msg_controllen = optlen;
 378                 msg.msg_control = (void*)(opt+1);
 379
 380                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 381                 if (retv)
 382                         goto done;
 383 update:
 384                 retv = 0;
 385                 if (inet_sk(sk)->is_icsk) {
 386                         if (opt) {
 387                                 struct inet_connection_sock *icsk = inet_csk(sk);
 388                                 if (!((1 << sk->sk_state) &
 389                                       (TCPF_LISTEN | TCPF_CLOSE))
 390                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 391                                         icsk->icsk_ext_hdr_len =
 392                                                 opt->opt_flen + opt->opt_nflen;
 393                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 394                                 }
 395                         }
 396                         opt = xchg(&np->opt, opt);
 397                         sk_dst_reset(sk);
 398                 } else {
 399                         write_lock(&sk->sk_dst_lock);
 400                         opt = xchg(&np->opt, opt);
 401                         write_unlock(&sk->sk_dst_lock);
 402                         sk_dst_reset(sk);
 403                 }
 404
 405 done:
 406                 if (opt)
 407                         sock_kfree_s(sk, opt, opt->tot_len);
 408                 break;
 409         }
 410         case IPV6_UNICAST_HOPS:
 411                 if (val > 255 || val < -1)
 412                         goto e_inval;
 413                 np->hop_limit = val;
 414                 retv = 0;
 415                 break;
 416
 417         case IPV6_MULTICAST_HOPS:
 418                 if (sk->sk_type == SOCK_STREAM)
 419                         goto e_inval;
 420                 if (val > 255 || val < -1)
 421                         goto e_inval;
 422                 np->mcast_hops = val;
 423                 retv = 0;
 424                 break;
 425
 426         case IPV6_MULTICAST_LOOP:
 427                 np->mc_loop = valbool;
 428                 retv = 0;
 429                 break;
 430
 431         case IPV6_MULTICAST_IF:
 432                 if (sk->sk_type == SOCK_STREAM)
 433                         goto e_inval;
 434
 435                 if (val) {
 436                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 437                                 goto e_inval;
 438
 439                         if (__dev_get_by_index(net, val) == NULL) {
 440                                 retv = -ENODEV;
 441                                 break;
 442                         }
 443                 }
 444                 np->mcast_oif = val;
 445                 retv = 0;
 446                 break;
 447         case IPV6_ADD_MEMBERSHIP:
 448         case IPV6_DROP_MEMBERSHIP:
 449         {
 450                 struct ipv6_mreq mreq;
 451
 452                 retv = -EPROTO;
 453                 if (inet_sk(sk)->is_icsk)
 454                         break;
 455
 456                 retv = -EFAULT;
 457                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 458                         break;
 459
 460                 if (optname == IPV6_ADD_MEMBERSHIP)
 461                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 462                 else
 463                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 464                 break;
 465         }
 466         case IPV6_JOIN_ANYCAST:
 467         case IPV6_LEAVE_ANYCAST:
 468         {
 469                 struct ipv6_mreq mreq;
 470
 471                 if (optlen != sizeof(struct ipv6_mreq))
 472                         goto e_inval;
 473
 474                 retv = -EFAULT;
 475                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 476                         break;
 477
 478                 if (optname == IPV6_JOIN_ANYCAST)
 479                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 480                 else
 481                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 482                 break;
 483         }
 484         case MCAST_JOIN_GROUP:
 485         case MCAST_LEAVE_GROUP:
 486         {
 487                 struct group_req greq;
 488                 struct sockaddr_in6 *psin6;
 489
 490                 retv = -EFAULT;
 491                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 492                         break;
 493                 if (greq.gr_group.ss_family != AF_INET6) {
 494                         retv = -EADDRNOTAVAIL;
 495                         break;
 496                 }
 497                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 498                 if (optname == MCAST_JOIN_GROUP)
 499                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 500                                 &psin6->sin6_addr);
 501                 else
 502                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 503                                 &psin6->sin6_addr);
 504                 break;
 505         }
 506         case MCAST_JOIN_SOURCE_GROUP:
 507         case MCAST_LEAVE_SOURCE_GROUP:
 508         case MCAST_BLOCK_SOURCE:
 509         case MCAST_UNBLOCK_SOURCE:
 510         {
 511                 struct group_source_req greqs;
 512                 int omode, add;
 513
 514                 if (optlen != sizeof(struct group_source_req))
 515                         goto e_inval;
 516                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 517                         retv = -EFAULT;
 518                         break;
 519                 }
 520                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 521                     greqs.gsr_source.ss_family != AF_INET6) {
 522                         retv = -EADDRNOTAVAIL;
 523                         break;
 524                 }
 525                 if (optname == MCAST_BLOCK_SOURCE) {
 526                         omode = MCAST_EXCLUDE;
 527                         add = 1;
 528                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 529                         omode = MCAST_EXCLUDE;
 530                         add = 0;
 531                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 532                         struct sockaddr_in6 *psin6;
 533
 534                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 535                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 536                                 &psin6->sin6_addr);
 537                         /* prior join w/ different source is ok */
 538                         if (retv && retv != -EADDRINUSE)
 539                                 break;
 540                         omode = MCAST_INCLUDE;
 541                         add = 1;
 542                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 543                         omode = MCAST_INCLUDE;
 544                         add = 0;
 545                 }
 546                 retv = ip6_mc_source(add, omode, sk, &greqs);
 547                 break;
 548         }
 549         case MCAST_MSFILTER:
 550         {
 551                 extern int sysctl_mld_max_msf;
 552                 struct group_filter *gsf;
 553
 554                 if (optlen < GROUP_FILTER_SIZE(0))
 555                         goto e_inval;
 556                 if (optlen > sysctl_optmem_max) {
 557                         retv = -ENOBUFS;
 558                         break;
 559                 }
 560                 gsf = kmalloc(optlen,GFP_KERNEL);
 561                 if (!gsf) {
 562                         retv = -ENOBUFS;
 563                         break;
 564                 }
 565                 retv = -EFAULT;
 566                 if (copy_from_user(gsf, optval, optlen)) {
 567                         kfree(gsf);
 568                         break;
 569                 }
 570                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 571                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 572                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 573                         kfree(gsf);
 574                         retv = -ENOBUFS;
 575                         break;
 576                 }
 577                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 578                         kfree(gsf);
 579                         retv = -EINVAL;
 580                         break;
 581                 }
 582                 retv = ip6_mc_msfilter(sk, gsf);
 583                 kfree(gsf);
 584
 585                 break;
 586         }
 587         case IPV6_ROUTER_ALERT:
 588                 retv = ip6_ra_control(sk, val, NULL);
 589                 break;
 590         case IPV6_MTU_DISCOVER:
 591                 if (val<0 || val>3)
 592                         goto e_inval;
 593                 np->pmtudisc = val;
 594                 retv = 0;
 595                 break;
 596         case IPV6_MTU:
 597                 if (val && val < IPV6_MIN_MTU)
 598                         goto e_inval;
 599                 np->frag_size = val;
 600                 retv = 0;
 601                 break;
 602         case IPV6_RECVERR:
 603                 np->recverr = valbool;
 604                 if (!val)
 605                         skb_queue_purge(&sk->sk_error_queue);
 606                 retv = 0;
 607                 break;
 608         case IPV6_FLOWINFO_SEND:
 609                 np->sndflow = valbool;
 610                 retv = 0;
 611                 break;
 612         case IPV6_FLOWLABEL_MGR:
 613                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 614                 break;
 615         case IPV6_IPSEC_POLICY:
 616         case IPV6_XFRM_POLICY:
 617                 retv = -EPERM;
 618                 if (!capable(CAP_NET_ADMIN))
 619                         break;
 620                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 621                 break;
 622
 623         case IPV6_ADDR_PREFERENCES:
 624             {
 625                 unsigned int pref = 0;
 626                 unsigned int prefmask = ~0;
 627
 628                 retv = -EINVAL;
 629
 630                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 631                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 632                                IPV6_PREFER_SRC_TMP|
 633                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 634                 case IPV6_PREFER_SRC_PUBLIC:
 635                         pref |= IPV6_PREFER_SRC_PUBLIC;
 636                         break;
 637                 case IPV6_PREFER_SRC_TMP:
 638                         pref |= IPV6_PREFER_SRC_TMP;
 639                         break;
 640                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 641                         break;
 642                 case 0:
 643                         goto pref_skip_pubtmp;
 644                 default:
 645                         goto e_inval;
 646                 }
 647
 648                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 649                               IPV6_PREFER_SRC_TMP);
 650 pref_skip_pubtmp:
 651
 652                 /* check HOME/COA conflicts */
 653                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 654                 case IPV6_PREFER_SRC_HOME:
 655                         break;
 656                 case IPV6_PREFER_SRC_COA:
 657                         pref |= IPV6_PREFER_SRC_COA;
 658                 case 0:
 659                         goto pref_skip_coa;
 660                 default:
 661                         goto e_inval;
 662                 }
 663
 664                 prefmask &= ~IPV6_PREFER_SRC_COA;
 665 pref_skip_coa:
 666
 667                 /* check CGA/NONCGA conflicts */
 668                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 669                 case IPV6_PREFER_SRC_CGA:
 670                 case IPV6_PREFER_SRC_NONCGA:
 671                 case 0:
 672                         break;
 673                 default:
 674                         goto e_inval;
 675                 }
 676
 677                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 678                 retv = 0;
 679
 680                 break;
 681             }
 682         }
 683
 684         release_sock(sk);
 685
 686         return retv;
 687
 688 e_inval:
 689         release_sock(sk);
 690         return -EINVAL;
 691 }
 692
 693 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 694                     char __user *optval, int optlen)
 695 {
 696         int err;
 697
 698         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 699                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 700
 701         if (level != SOL_IPV6)
 702                 return -ENOPROTOOPT;
 703
 704         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 705 #ifdef CONFIG_NETFILTER
 706         /* we need to exclude all possible ENOPROTOOPTs except default case */
 707         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 708                         optname != IPV6_XFRM_POLICY) {
 709                 lock_sock(sk);
 710                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 711                                 optlen);
 712                 release_sock(sk);
 713         }
 714 #endif
 715         return err;
 716 }
 717
 718 EXPORT_SYMBOL(ipv6_setsockopt);
 719
 720 #ifdef CONFIG_COMPAT
 721 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 722                            char __user *optval, int optlen)
 723 {
 724         int err;
 725
 726         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 727                 if (udp_prot.compat_setsockopt != NULL)
 728                         return udp_prot.compat_setsockopt(sk, level, optname,
 729                                                           optval, optlen);
 730                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 731         }
 732
 733         if (level != SOL_IPV6)
 734                 return -ENOPROTOOPT;
 735
 736         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 737 #ifdef CONFIG_NETFILTER
 738         /* we need to exclude all possible ENOPROTOOPTs except default case */
 739         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 740             optname != IPV6_XFRM_POLICY) {
 741                 lock_sock(sk);
 742                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 743                                            optval, optlen);
 744                 release_sock(sk);
 745         }
 746 #endif
 747         return err;
 748 }
 749
 750 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 751 #endif
 752
 753 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 754                                   int optname, char __user *optval, int len)
 755 {
 756         struct ipv6_opt_hdr *hdr;
 757
 758         if (!opt)
 759                 return 0;
 760
 761         switch(optname) {
 762         case IPV6_HOPOPTS:
 763                 hdr = opt->hopopt;
 764                 break;
 765         case IPV6_RTHDRDSTOPTS:
 766                 hdr = opt->dst0opt;
 767                 break;
 768         case IPV6_RTHDR:
 769                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 770                 break;
 771         case IPV6_DSTOPTS:
 772                 hdr = opt->dst1opt;
 773                 break;
 774         default:
 775                 return -EINVAL; /* should not happen */
 776         }
 777
 778         if (!hdr)
 779                 return 0;
 780
 781         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 782         if (copy_to_user(optval, hdr, len))
 783                 return -EFAULT;
 784         return ipv6_optlen(hdr);
 785 }
 786
 787 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 788                     char __user *optval, int __user *optlen)
 789 {
 790         struct ipv6_pinfo *np = inet6_sk(sk);
 791         int len;
 792         int val;
 793
 794         if (ip6_mroute_opt(optname))
 795                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 796
 797         if (get_user(len, optlen))
 798                 return -EFAULT;
 799         switch (optname) {
 800         case IPV6_ADDRFORM:
 801                 if (sk->sk_protocol != IPPROTO_UDP &&
 802                     sk->sk_protocol != IPPROTO_UDPLITE &&
 803                     sk->sk_protocol != IPPROTO_TCP)
 804                         return -EINVAL;
 805                 if (sk->sk_state != TCP_ESTABLISHED)
 806                         return -ENOTCONN;
 807                 val = sk->sk_family;
 808                 break;
 809         case MCAST_MSFILTER:
 810         {
 811                 struct group_filter gsf;
 812                 int err;
 813
 814                 if (len < GROUP_FILTER_SIZE(0))
 815                         return -EINVAL;
 816                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 817                         return -EFAULT;
 818                 lock_sock(sk);
 819                 err = ip6_mc_msfget(sk, &gsf,
 820                         (struct group_filter __user *)optval, optlen);
 821                 release_sock(sk);
 822                 return err;
 823         }
 824
 825         case IPV6_2292PKTOPTIONS:
 826         {
 827                 struct msghdr msg;
 828                 struct sk_buff *skb;
 829
 830                 if (sk->sk_type != SOCK_STREAM)
 831                         return -ENOPROTOOPT;
 832
 833                 msg.msg_control = optval;
 834                 msg.msg_controllen = len;
 835                 msg.msg_flags = 0;
 836
 837                 lock_sock(sk);
 838                 skb = np->pktoptions;
 839                 if (skb)
 840                         atomic_inc(&skb->users);
 841                 release_sock(sk);
 842
 843                 if (skb) {
 844                         int err = datagram_recv_ctl(sk, &msg, skb);
 845                         kfree_skb(skb);
 846                         if (err)
 847                                 return err;
 848                 } else {
 849                         if (np->rxopt.bits.rxinfo) {
 850                                 struct in6_pktinfo src_info;
 851                                 src_info.ipi6_ifindex = np->mcast_oif;
 852                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 853                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 854                         }
 855                         if (np->rxopt.bits.rxhlim) {
 856                                 int hlim = np->mcast_hops;
 857                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 858                         }
 859                         if (np->rxopt.bits.rxoinfo) {
 860                                 struct in6_pktinfo src_info;
 861                                 src_info.ipi6_ifindex = np->mcast_oif;
 862                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 863                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 864                         }
 865                         if (np->rxopt.bits.rxohlim) {
 866                                 int hlim = np->mcast_hops;
 867                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 868                         }
 869                 }
 870                 len -= msg.msg_controllen;
 871                 return put_user(len, optlen);
 872         }
 873         case IPV6_MTU:
 874         {
 875                 struct dst_entry *dst;
 876                 val = 0;
 877                 lock_sock(sk);
 878                 dst = sk_dst_get(sk);
 879                 if (dst) {
 880                         val = dst_mtu(dst);
 881                         dst_release(dst);
 882                 }
 883                 release_sock(sk);
 884                 if (!val)
 885                         return -ENOTCONN;
 886                 break;
 887         }
 888
 889         case IPV6_V6ONLY:
 890                 val = np->ipv6only;
 891                 break;
 892
 893         case IPV6_RECVPKTINFO:
 894                 val = np->rxopt.bits.rxinfo;
 895                 break;
 896
 897         case IPV6_2292PKTINFO:
 898                 val = np->rxopt.bits.rxoinfo;
 899                 break;
 900
 901         case IPV6_RECVHOPLIMIT:
 902                 val = np->rxopt.bits.rxhlim;
 903                 break;
 904
 905         case IPV6_2292HOPLIMIT:
 906                 val = np->rxopt.bits.rxohlim;
 907                 break;
 908
 909         case IPV6_RECVRTHDR:
 910                 val = np->rxopt.bits.srcrt;
 911                 break;
 912
 913         case IPV6_2292RTHDR:
 914                 val = np->rxopt.bits.osrcrt;
 915                 break;
 916
 917         case IPV6_HOPOPTS:
 918         case IPV6_RTHDRDSTOPTS:
 919         case IPV6_RTHDR:
 920         case IPV6_DSTOPTS:
 921         {
 922
 923                 lock_sock(sk);
 924                 len = ipv6_getsockopt_sticky(sk, np->opt,
 925                                              optname, optval, len);
 926                 release_sock(sk);
 927                 return put_user(len, optlen);
 928         }
 929
 930         case IPV6_RECVHOPOPTS:
 931                 val = np->rxopt.bits.hopopts;
 932                 break;
 933
 934         case IPV6_2292HOPOPTS:
 935                 val = np->rxopt.bits.ohopopts;
 936                 break;
 937
 938         case IPV6_RECVDSTOPTS:
 939                 val = np->rxopt.bits.dstopts;
 940                 break;
 941
 942         case IPV6_2292DSTOPTS:
 943                 val = np->rxopt.bits.odstopts;
 944                 break;
 945
 946         case IPV6_TCLASS:
 947                 val = np->tclass;
 948                 if (val < 0)
 949                         val = 0;
 950                 break;
 951
 952         case IPV6_RECVTCLASS:
 953                 val = np->rxopt.bits.rxtclass;
 954                 break;
 955
 956         case IPV6_FLOWINFO:
 957                 val = np->rxopt.bits.rxflow;
 958                 break;
 959
 960         case IPV6_UNICAST_HOPS:
 961         case IPV6_MULTICAST_HOPS:
 962         {
 963                 struct dst_entry *dst;
 964
 965                 if (optname == IPV6_UNICAST_HOPS)
 966                         val = np->hop_limit;
 967                 else
 968                         val = np->mcast_hops;
 969
 970                 dst = sk_dst_get(sk);
 971                 if (dst) {
 972                         if (val < 0)
 973                                 val = ip6_dst_hoplimit(dst);
 974                         dst_release(dst);
 975                 }
 976                 if (val < 0)
 977                         val = ipv6_devconf.hop_limit;
 978                 break;
 979         }
 980
 981         case IPV6_MULTICAST_LOOP:
 982                 val = np->mc_loop;
 983                 break;
 984
 985         case IPV6_MULTICAST_IF:
 986                 val = np->mcast_oif;
 987                 break;
 988
 989         case IPV6_MTU_DISCOVER:
 990                 val = np->pmtudisc;
 991                 break;
 992
 993         case IPV6_RECVERR:
 994                 val = np->recverr;
 995                 break;
 996
 997         case IPV6_FLOWINFO_SEND:
 998                 val = np->sndflow;
 999                 break;
1000
1001         case IPV6_ADDR_PREFERENCES:
1002                 val = 0;
1003
1004                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1005                         val |= IPV6_PREFER_SRC_TMP;
1006                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1007                         val |= IPV6_PREFER_SRC_PUBLIC;
1008                 else {
1009                         /* XXX: should we return system default? */
1010                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1011                 }
1012
1013                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1014                         val |= IPV6_PREFER_SRC_COA;
1015                 else
1016                         val |= IPV6_PREFER_SRC_HOME;
1017                 break;
1018
1019         default:
1020                 return -ENOPROTOOPT;
1021         }
1022         len = min_t(unsigned int, sizeof(int), len);
1023         if(put_user(len, optlen))
1024                 return -EFAULT;
1025         if(copy_to_user(optval,&val,len))
1026                 return -EFAULT;
1027         return 0;
1028 }
1029
1030 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1031                     char __user *optval, int __user *optlen)
1032 {
1033         int err;
1034
1035         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1036                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1037
1038         if(level != SOL_IPV6)
1039                 return -ENOPROTOOPT;
1040
1041         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1042 #ifdef CONFIG_NETFILTER
1043         /* we need to exclude all possible ENOPROTOOPTs except default case */
1044         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1045                 int len;
1046
1047                 if (get_user(len, optlen))
1048                         return -EFAULT;
1049
1050                 lock_sock(sk);
1051                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1052                                 &len);
1053                 release_sock(sk);
1054                 if (err >= 0)
1055                         err = put_user(len, optlen);
1056         }
1057 #endif
1058         return err;
1059 }
1060
1061 EXPORT_SYMBOL(ipv6_getsockopt);
1062
1063 #ifdef CONFIG_COMPAT
1064 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1065                            char __user *optval, int __user *optlen)
1066 {
1067         int err;
1068
1069         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1070                 if (udp_prot.compat_getsockopt != NULL)
1071                         return udp_prot.compat_getsockopt(sk, level, optname,
1072                                                           optval, optlen);
1073                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1074         }
1075
1076         if (level != SOL_IPV6)
1077                 return -ENOPROTOOPT;
1078
1079         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1080 #ifdef CONFIG_NETFILTER
1081         /* we need to exclude all possible ENOPROTOOPTs except default case */
1082         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1083                 int len;
1084
1085                 if (get_user(len, optlen))
1086                         return -EFAULT;
1087
1088                 lock_sock(sk);
1089                 err = compat_nf_getsockopt(sk, PF_INET6,
1090                                            optname, optval, &len);
1091                 release_sock(sk);
1092                 if (err >= 0)
1093                         err = put_user(len, optlen);
1094         }
1095 #endif
1096         return err;
1097 }
1098
1099 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1100 #endif
1101