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 = sock_net(sk);
 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         case IPV6_ADDR_PREFERENCES:
 621             {
 622                 unsigned int pref = 0;
 623                 unsigned int prefmask = ~0;
 624
 625                 retv = -EINVAL;
 626
 627                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 628                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 629                                IPV6_PREFER_SRC_TMP|
 630                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 631                 case IPV6_PREFER_SRC_PUBLIC:
 632                         pref |= IPV6_PREFER_SRC_PUBLIC;
 633                         break;
 634                 case IPV6_PREFER_SRC_TMP:
 635                         pref |= IPV6_PREFER_SRC_TMP;
 636                         break;
 637                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 638                         break;
 639                 case 0:
 640                         goto pref_skip_pubtmp;
 641                 default:
 642                         goto e_inval;
 643                 }
 644
 645                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 646                               IPV6_PREFER_SRC_TMP);
 647 pref_skip_pubtmp:
 648
 649                 /* check HOME/COA conflicts */
 650                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 651                 case IPV6_PREFER_SRC_HOME:
 652                         break;
 653                 case IPV6_PREFER_SRC_COA:
 654                         pref |= IPV6_PREFER_SRC_COA;
 655                 case 0:
 656                         goto pref_skip_coa;
 657                 default:
 658                         goto e_inval;
 659                 }
 660
 661                 prefmask &= ~IPV6_PREFER_SRC_COA;
 662 pref_skip_coa:
 663
 664                 /* check CGA/NONCGA conflicts */
 665                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 666                 case IPV6_PREFER_SRC_CGA:
 667                 case IPV6_PREFER_SRC_NONCGA:
 668                 case 0:
 669                         break;
 670                 default:
 671                         goto e_inval;
 672                 }
 673
 674                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 675                 retv = 0;
 676
 677                 break;
 678             }
 679         }
 680
 681         release_sock(sk);
 682
 683         return retv;
 684
 685 e_inval:
 686         release_sock(sk);
 687         return -EINVAL;
 688 }
 689
 690 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 691                     char __user *optval, int optlen)
 692 {
 693         int err;
 694
 695         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 696                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 697
 698         if (level != SOL_IPV6)
 699                 return -ENOPROTOOPT;
 700
 701         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 702 #ifdef CONFIG_NETFILTER
 703         /* we need to exclude all possible ENOPROTOOPTs except default case */
 704         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 705                         optname != IPV6_XFRM_POLICY) {
 706                 lock_sock(sk);
 707                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 708                                 optlen);
 709                 release_sock(sk);
 710         }
 711 #endif
 712         return err;
 713 }
 714
 715 EXPORT_SYMBOL(ipv6_setsockopt);
 716
 717 #ifdef CONFIG_COMPAT
 718 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 719                            char __user *optval, int optlen)
 720 {
 721         int err;
 722
 723         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 724                 if (udp_prot.compat_setsockopt != NULL)
 725                         return udp_prot.compat_setsockopt(sk, level, optname,
 726                                                           optval, optlen);
 727                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 728         }
 729
 730         if (level != SOL_IPV6)
 731                 return -ENOPROTOOPT;
 732
 733         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 734 #ifdef CONFIG_NETFILTER
 735         /* we need to exclude all possible ENOPROTOOPTs except default case */
 736         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 737             optname != IPV6_XFRM_POLICY) {
 738                 lock_sock(sk);
 739                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 740                                            optval, optlen);
 741                 release_sock(sk);
 742         }
 743 #endif
 744         return err;
 745 }
 746
 747 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 748 #endif
 749
 750 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 751                                   int optname, char __user *optval, int len)
 752 {
 753         struct ipv6_opt_hdr *hdr;
 754
 755         if (!opt)
 756                 return 0;
 757
 758         switch(optname) {
 759         case IPV6_HOPOPTS:
 760                 hdr = opt->hopopt;
 761                 break;
 762         case IPV6_RTHDRDSTOPTS:
 763                 hdr = opt->dst0opt;
 764                 break;
 765         case IPV6_RTHDR:
 766                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 767                 break;
 768         case IPV6_DSTOPTS:
 769                 hdr = opt->dst1opt;
 770                 break;
 771         default:
 772                 return -EINVAL; /* should not happen */
 773         }
 774
 775         if (!hdr)
 776                 return 0;
 777
 778         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 779         if (copy_to_user(optval, hdr, len))
 780                 return -EFAULT;
 781         return ipv6_optlen(hdr);
 782 }
 783
 784 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 785                     char __user *optval, int __user *optlen)
 786 {
 787         struct ipv6_pinfo *np = inet6_sk(sk);
 788         int len;
 789         int val;
 790
 791         if (get_user(len, optlen))
 792                 return -EFAULT;
 793         switch (optname) {
 794         case IPV6_ADDRFORM:
 795                 if (sk->sk_protocol != IPPROTO_UDP &&
 796                     sk->sk_protocol != IPPROTO_UDPLITE &&
 797                     sk->sk_protocol != IPPROTO_TCP)
 798                         return -EINVAL;
 799                 if (sk->sk_state != TCP_ESTABLISHED)
 800                         return -ENOTCONN;
 801                 val = sk->sk_family;
 802                 break;
 803         case MCAST_MSFILTER:
 804         {
 805                 struct group_filter gsf;
 806                 int err;
 807
 808                 if (len < GROUP_FILTER_SIZE(0))
 809                         return -EINVAL;
 810                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 811                         return -EFAULT;
 812                 lock_sock(sk);
 813                 err = ip6_mc_msfget(sk, &gsf,
 814                         (struct group_filter __user *)optval, optlen);
 815                 release_sock(sk);
 816                 return err;
 817         }
 818
 819         case IPV6_2292PKTOPTIONS:
 820         {
 821                 struct msghdr msg;
 822                 struct sk_buff *skb;
 823
 824                 if (sk->sk_type != SOCK_STREAM)
 825                         return -ENOPROTOOPT;
 826
 827                 msg.msg_control = optval;
 828                 msg.msg_controllen = len;
 829                 msg.msg_flags = 0;
 830
 831                 lock_sock(sk);
 832                 skb = np->pktoptions;
 833                 if (skb)
 834                         atomic_inc(&skb->users);
 835                 release_sock(sk);
 836
 837                 if (skb) {
 838                         int err = datagram_recv_ctl(sk, &msg, skb);
 839                         kfree_skb(skb);
 840                         if (err)
 841                                 return err;
 842                 } else {
 843                         if (np->rxopt.bits.rxinfo) {
 844                                 struct in6_pktinfo src_info;
 845                                 src_info.ipi6_ifindex = np->mcast_oif;
 846                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 847                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 848                         }
 849                         if (np->rxopt.bits.rxhlim) {
 850                                 int hlim = np->mcast_hops;
 851                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 852                         }
 853                         if (np->rxopt.bits.rxoinfo) {
 854                                 struct in6_pktinfo src_info;
 855                                 src_info.ipi6_ifindex = np->mcast_oif;
 856                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 857                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 858                         }
 859                         if (np->rxopt.bits.rxohlim) {
 860                                 int hlim = np->mcast_hops;
 861                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 862                         }
 863                 }
 864                 len -= msg.msg_controllen;
 865                 return put_user(len, optlen);
 866         }
 867         case IPV6_MTU:
 868         {
 869                 struct dst_entry *dst;
 870                 val = 0;
 871                 lock_sock(sk);
 872                 dst = sk_dst_get(sk);
 873                 if (dst) {
 874                         val = dst_mtu(dst);
 875                         dst_release(dst);
 876                 }
 877                 release_sock(sk);
 878                 if (!val)
 879                         return -ENOTCONN;
 880                 break;
 881         }
 882
 883         case IPV6_V6ONLY:
 884                 val = np->ipv6only;
 885                 break;
 886
 887         case IPV6_RECVPKTINFO:
 888                 val = np->rxopt.bits.rxinfo;
 889                 break;
 890
 891         case IPV6_2292PKTINFO:
 892                 val = np->rxopt.bits.rxoinfo;
 893                 break;
 894
 895         case IPV6_RECVHOPLIMIT:
 896                 val = np->rxopt.bits.rxhlim;
 897                 break;
 898
 899         case IPV6_2292HOPLIMIT:
 900                 val = np->rxopt.bits.rxohlim;
 901                 break;
 902
 903         case IPV6_RECVRTHDR:
 904                 val = np->rxopt.bits.srcrt;
 905                 break;
 906
 907         case IPV6_2292RTHDR:
 908                 val = np->rxopt.bits.osrcrt;
 909                 break;
 910
 911         case IPV6_HOPOPTS:
 912         case IPV6_RTHDRDSTOPTS:
 913         case IPV6_RTHDR:
 914         case IPV6_DSTOPTS:
 915         {
 916
 917                 lock_sock(sk);
 918                 len = ipv6_getsockopt_sticky(sk, np->opt,
 919                                              optname, optval, len);
 920                 release_sock(sk);
 921                 return put_user(len, optlen);
 922         }
 923
 924         case IPV6_RECVHOPOPTS:
 925                 val = np->rxopt.bits.hopopts;
 926                 break;
 927
 928         case IPV6_2292HOPOPTS:
 929                 val = np->rxopt.bits.ohopopts;
 930                 break;
 931
 932         case IPV6_RECVDSTOPTS:
 933                 val = np->rxopt.bits.dstopts;
 934                 break;
 935
 936         case IPV6_2292DSTOPTS:
 937                 val = np->rxopt.bits.odstopts;
 938                 break;
 939
 940         case IPV6_TCLASS:
 941                 val = np->tclass;
 942                 if (val < 0)
 943                         val = 0;
 944                 break;
 945
 946         case IPV6_RECVTCLASS:
 947                 val = np->rxopt.bits.rxtclass;
 948                 break;
 949
 950         case IPV6_FLOWINFO:
 951                 val = np->rxopt.bits.rxflow;
 952                 break;
 953
 954         case IPV6_UNICAST_HOPS:
 955         case IPV6_MULTICAST_HOPS:
 956         {
 957                 struct dst_entry *dst;
 958
 959                 if (optname == IPV6_UNICAST_HOPS)
 960                         val = np->hop_limit;
 961                 else
 962                         val = np->mcast_hops;
 963
 964                 dst = sk_dst_get(sk);
 965                 if (dst) {
 966                         if (val < 0)
 967                                 val = ip6_dst_hoplimit(dst);
 968                         dst_release(dst);
 969                 }
 970                 if (val < 0)
 971                         val = ipv6_devconf.hop_limit;
 972                 break;
 973         }
 974
 975         case IPV6_MULTICAST_LOOP:
 976                 val = np->mc_loop;
 977                 break;
 978
 979         case IPV6_MULTICAST_IF:
 980                 val = np->mcast_oif;
 981                 break;
 982
 983         case IPV6_MTU_DISCOVER:
 984                 val = np->pmtudisc;
 985                 break;
 986
 987         case IPV6_RECVERR:
 988                 val = np->recverr;
 989                 break;
 990
 991         case IPV6_FLOWINFO_SEND:
 992                 val = np->sndflow;
 993                 break;
 994
 995         case IPV6_ADDR_PREFERENCES:
 996                 val = 0;
 997
 998                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
 999                         val |= IPV6_PREFER_SRC_TMP;
1000                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1001                         val |= IPV6_PREFER_SRC_PUBLIC;
1002                 else {
1003                         /* XXX: should we return system default? */
1004                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1005                 }
1006
1007                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1008                         val |= IPV6_PREFER_SRC_COA;
1009                 else
1010                         val |= IPV6_PREFER_SRC_HOME;
1011                 break;
1012
1013         default:
1014                 return -ENOPROTOOPT;
1015         }
1016         len = min_t(unsigned int, sizeof(int), len);
1017         if(put_user(len, optlen))
1018                 return -EFAULT;
1019         if(copy_to_user(optval,&val,len))
1020                 return -EFAULT;
1021         return 0;
1022 }
1023
1024 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1025                     char __user *optval, int __user *optlen)
1026 {
1027         int err;
1028
1029         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1030                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1031
1032         if(level != SOL_IPV6)
1033                 return -ENOPROTOOPT;
1034
1035         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1036 #ifdef CONFIG_NETFILTER
1037         /* we need to exclude all possible ENOPROTOOPTs except default case */
1038         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1039                 int len;
1040
1041                 if (get_user(len, optlen))
1042                         return -EFAULT;
1043
1044                 lock_sock(sk);
1045                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1046                                 &len);
1047                 release_sock(sk);
1048                 if (err >= 0)
1049                         err = put_user(len, optlen);
1050         }
1051 #endif
1052         return err;
1053 }
1054
1055 EXPORT_SYMBOL(ipv6_getsockopt);
1056
1057 #ifdef CONFIG_COMPAT
1058 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1059                            char __user *optval, int __user *optlen)
1060 {
1061         int err;
1062
1063         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1064                 if (udp_prot.compat_getsockopt != NULL)
1065                         return udp_prot.compat_getsockopt(sk, level, optname,
1066                                                           optval, optlen);
1067                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1068         }
1069
1070         if (level != SOL_IPV6)
1071                 return -ENOPROTOOPT;
1072
1073         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1074 #ifdef CONFIG_NETFILTER
1075         /* we need to exclude all possible ENOPROTOOPTs except default case */
1076         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1077                 int len;
1078
1079                 if (get_user(len, optlen))
1080                         return -EFAULT;
1081
1082                 lock_sock(sk);
1083                 err = compat_nf_getsockopt(sk, PF_INET6,
1084                                            optname, optval, &len);
1085                 release_sock(sk);
1086                 if (err >= 0)
1087                         err = put_user(len, optlen);
1088         }
1089 #endif
1090         return err;
1091 }
1092
1093 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1094 #endif
1095