net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  *
  15  *      FIXME: Make the setsockopt code POSIX compliant: That is
  16  *
  17  *      o       Truncate getsockopt returns
  18  *      o       Return an optlen of the truncated length if need be
  19  *
  20  *      Changes:
  21  *      David L Stevens <dlstevens@us.ibm.com>:
  22  *              - added multicast source filtering API for MLDv2
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/capability.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/socket.h>
  30 #include <linux/sockios.h>
  31 #include <linux/net.h>
  32 #include <linux/in6.h>
  33 #include <linux/mroute6.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/init.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/netfilter.h>
  39
  40 #include <net/sock.h>
  41 #include <net/snmp.h>
  42 #include <net/ipv6.h>
  43 #include <net/ndisc.h>
  44 #include <net/protocol.h>
  45 #include <net/transp_v6.h>
  46 #include <net/ip6_route.h>
  47 #include <net/addrconf.h>
  48 #include <net/inet_common.h>
  49 #include <net/tcp.h>
  50 #include <net/udp.h>
  51 #include <net/udplite.h>
  52 #include <net/xfrm.h>
  53 #include <net/compat.h>
  54
  55 #include <asm/uaccess.h>
  56
  57 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  58
  59 struct ip6_ra_chain *ip6_ra_chain;
  60 DEFINE_RWLOCK(ip6_ra_lock);
  61
  62 int ip6_ra_control(struct sock *sk, int sel)
  63 {
  64         struct ip6_ra_chain *ra, *new_ra, **rap;
  65
  66         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  67         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
  68                 return -ENOPROTOOPT;
  69
  70         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  71
  72         write_lock_bh(&ip6_ra_lock);
  73         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  74                 if (ra->sk == sk) {
  75                         if (sel>=0) {
  76                                 write_unlock_bh(&ip6_ra_lock);
  77                                 kfree(new_ra);
  78                                 return -EADDRINUSE;
  79                         }
  80
  81                         *rap = ra->next;
  82                         write_unlock_bh(&ip6_ra_lock);
  83
  84                         sock_put(sk);
  85                         kfree(ra);
  86                         return 0;
  87                 }
  88         }
  89         if (new_ra == NULL) {
  90                 write_unlock_bh(&ip6_ra_lock);
  91                 return -ENOBUFS;
  92         }
  93         new_ra->sk = sk;
  94         new_ra->sel = sel;
  95         new_ra->next = ra;
  96         *rap = new_ra;
  97         sock_hold(sk);
  98         write_unlock_bh(&ip6_ra_lock);
  99         return 0;
 100 }
 101
 102 static
 103 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 104                                            struct ipv6_txoptions *opt)
 105 {
 106         if (inet_sk(sk)->is_icsk) {
 107                 if (opt &&
 108                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 109                     inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 110                         struct inet_connection_sock *icsk = inet_csk(sk);
 111                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 112                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 113                 }
 114                 opt = xchg(&inet6_sk(sk)->opt, opt);
 115         } else {
 116                 write_lock(&sk->sk_dst_lock);
 117                 opt = xchg(&inet6_sk(sk)->opt, opt);
 118                 write_unlock(&sk->sk_dst_lock);
 119         }
 120         sk_dst_reset(sk);
 121
 122         return opt;
 123 }
 124
 125 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 126                     char __user *optval, int optlen)
 127 {
 128         struct ipv6_pinfo *np = inet6_sk(sk);
 129         struct net *net = sock_net(sk);
 130         int val, valbool;
 131         int retv = -ENOPROTOOPT;
 132
 133         if (optval == NULL)
 134                 val=0;
 135         else {
 136                 if (optlen >= sizeof(int)) {
 137                         if (get_user(val, (int __user *) optval))
 138                                 return -EFAULT;
 139                 } else
 140                         val = 0;
 141         }
 142
 143         valbool = (val!=0);
 144
 145         if (ip6_mroute_opt(optname))
 146                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 147
 148         lock_sock(sk);
 149
 150         switch (optname) {
 151
 152         case IPV6_ADDRFORM:
 153                 if (optlen < sizeof(int))
 154                         goto e_inval;
 155                 if (val == PF_INET) {
 156                         struct ipv6_txoptions *opt;
 157                         struct sk_buff *pktopt;
 158
 159                         if (sk->sk_type == SOCK_RAW)
 160                                 break;
 161
 162                         if (sk->sk_protocol == IPPROTO_UDP ||
 163                             sk->sk_protocol == IPPROTO_UDPLITE) {
 164                                 struct udp_sock *up = udp_sk(sk);
 165                                 if (up->pending == AF_INET6) {
 166                                         retv = -EBUSY;
 167                                         break;
 168                                 }
 169                         } else if (sk->sk_protocol != IPPROTO_TCP)
 170                                 break;
 171
 172                         if (sk->sk_state != TCP_ESTABLISHED) {
 173                                 retv = -ENOTCONN;
 174                                 break;
 175                         }
 176
 177                         if (ipv6_only_sock(sk) ||
 178                             !ipv6_addr_v4mapped(&np->daddr)) {
 179                                 retv = -EADDRNOTAVAIL;
 180                                 break;
 181                         }
 182
 183                         fl6_free_socklist(sk);
 184                         ipv6_sock_mc_close(sk);
 185
 186                         /*
 187                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 188                          * remove it from the refcnt debug socks count in the
 189                          * original family...
 190                          */
 191                         sk_refcnt_debug_dec(sk);
 192
 193                         if (sk->sk_protocol == IPPROTO_TCP) {
 194                                 struct inet_connection_sock *icsk = inet_csk(sk);
 195                                 local_bh_disable();
 196                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 197                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 198                                 local_bh_enable();
 199                                 sk->sk_prot = &tcp_prot;
 200                                 icsk->icsk_af_ops = &ipv4_specific;
 201                                 sk->sk_socket->ops = &inet_stream_ops;
 202                                 sk->sk_family = PF_INET;
 203                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 204                         } else {
 205                                 struct proto *prot = &udp_prot;
 206
 207                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 208                                         prot = &udplite_prot;
 209                                 local_bh_disable();
 210                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 211                                 sock_prot_inuse_add(net, prot, 1);
 212                                 local_bh_enable();
 213                                 sk->sk_prot = prot;
 214                                 sk->sk_socket->ops = &inet_dgram_ops;
 215                                 sk->sk_family = PF_INET;
 216                         }
 217                         opt = xchg(&np->opt, NULL);
 218                         if (opt)
 219                                 sock_kfree_s(sk, opt, opt->tot_len);
 220                         pktopt = xchg(&np->pktoptions, NULL);
 221                         kfree_skb(pktopt);
 222
 223                         sk->sk_destruct = inet_sock_destruct;
 224                         /*
 225                          * ... and add it to the refcnt debug socks count
 226                          * in the new family. -acme
 227                          */
 228                         sk_refcnt_debug_inc(sk);
 229                         module_put(THIS_MODULE);
 230                         retv = 0;
 231                         break;
 232                 }
 233                 goto e_inval;
 234
 235         case IPV6_V6ONLY:
 236                 if (optlen < sizeof(int) ||
 237                     inet_sk(sk)->num)
 238                         goto e_inval;
 239                 np->ipv6only = valbool;
 240                 retv = 0;
 241                 break;
 242
 243         case IPV6_RECVPKTINFO:
 244                 if (optlen < sizeof(int))
 245                         goto e_inval;
 246                 np->rxopt.bits.rxinfo = valbool;
 247                 retv = 0;
 248                 break;
 249
 250         case IPV6_2292PKTINFO:
 251                 if (optlen < sizeof(int))
 252                         goto e_inval;
 253                 np->rxopt.bits.rxoinfo = valbool;
 254                 retv = 0;
 255                 break;
 256
 257         case IPV6_RECVHOPLIMIT:
 258                 if (optlen < sizeof(int))
 259                         goto e_inval;
 260                 np->rxopt.bits.rxhlim = valbool;
 261                 retv = 0;
 262                 break;
 263
 264         case IPV6_2292HOPLIMIT:
 265                 if (optlen < sizeof(int))
 266                         goto e_inval;
 267                 np->rxopt.bits.rxohlim = valbool;
 268                 retv = 0;
 269                 break;
 270
 271         case IPV6_RECVRTHDR:
 272                 if (optlen < sizeof(int))
 273                         goto e_inval;
 274                 np->rxopt.bits.srcrt = valbool;
 275                 retv = 0;
 276                 break;
 277
 278         case IPV6_2292RTHDR:
 279                 if (optlen < sizeof(int))
 280                         goto e_inval;
 281                 np->rxopt.bits.osrcrt = valbool;
 282                 retv = 0;
 283                 break;
 284
 285         case IPV6_RECVHOPOPTS:
 286                 if (optlen < sizeof(int))
 287                         goto e_inval;
 288                 np->rxopt.bits.hopopts = valbool;
 289                 retv = 0;
 290                 break;
 291
 292         case IPV6_2292HOPOPTS:
 293                 if (optlen < sizeof(int))
 294                         goto e_inval;
 295                 np->rxopt.bits.ohopopts = valbool;
 296                 retv = 0;
 297                 break;
 298
 299         case IPV6_RECVDSTOPTS:
 300                 if (optlen < sizeof(int))
 301                         goto e_inval;
 302                 np->rxopt.bits.dstopts = valbool;
 303                 retv = 0;
 304                 break;
 305
 306         case IPV6_2292DSTOPTS:
 307                 if (optlen < sizeof(int))
 308                         goto e_inval;
 309                 np->rxopt.bits.odstopts = valbool;
 310                 retv = 0;
 311                 break;
 312
 313         case IPV6_TCLASS:
 314                 if (optlen < sizeof(int))
 315                         goto e_inval;
 316                 if (val < -1 || val > 0xff)
 317                         goto e_inval;
 318                 np->tclass = val;
 319                 retv = 0;
 320                 break;
 321
 322         case IPV6_RECVTCLASS:
 323                 if (optlen < sizeof(int))
 324                         goto e_inval;
 325                 np->rxopt.bits.rxtclass = valbool;
 326                 retv = 0;
 327                 break;
 328
 329         case IPV6_FLOWINFO:
 330                 if (optlen < sizeof(int))
 331                         goto e_inval;
 332                 np->rxopt.bits.rxflow = valbool;
 333                 retv = 0;
 334                 break;
 335
 336         case IPV6_HOPOPTS:
 337         case IPV6_RTHDRDSTOPTS:
 338         case IPV6_RTHDR:
 339         case IPV6_DSTOPTS:
 340         {
 341                 struct ipv6_txoptions *opt;
 342
 343                 /* remove any sticky options header with a zero option
 344                  * length, per RFC3542.
 345                  */
 346                 if (optlen == 0)
 347                         optval = NULL;
 348                 else if (optval == NULL)
 349                         goto e_inval;
 350                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 351                          optlen & 0x7 || optlen > 8 * 255)
 352                         goto e_inval;
 353
 354                 /* hop-by-hop / destination options are privileged option */
 355                 retv = -EPERM;
 356                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 357                         break;
 358
 359                 opt = ipv6_renew_options(sk, np->opt, optname,
 360                                          (struct ipv6_opt_hdr __user *)optval,
 361                                          optlen);
 362                 if (IS_ERR(opt)) {
 363                         retv = PTR_ERR(opt);
 364                         break;
 365                 }
 366
 367                 /* routing header option needs extra check */
 368                 retv = -EINVAL;
 369                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 370                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 371                         switch (rthdr->type) {
 372 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 373                         case IPV6_SRCRT_TYPE_2:
 374                                 if (rthdr->hdrlen != 2 ||
 375                                     rthdr->segments_left != 1)
 376                                         goto sticky_done;
 377
 378                                 break;
 379 #endif
 380                         default:
 381                                 goto sticky_done;
 382                         }
 383                 }
 384
 385                 retv = 0;
 386                 opt = ipv6_update_options(sk, opt);
 387 sticky_done:
 388                 if (opt)
 389                         sock_kfree_s(sk, opt, opt->tot_len);
 390                 break;
 391         }
 392
 393         case IPV6_PKTINFO:
 394         {
 395                 struct in6_pktinfo pkt;
 396
 397                 if (optlen == 0)
 398                         goto e_inval;
 399                 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
 400                         goto e_inval;
 401
 402                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 403                                 retv = -EFAULT;
 404                                 break;
 405                 }
 406                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 407                         goto e_inval;
 408
 409                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 410                 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
 411                 retv = 0;
 412                 break;
 413         }
 414
 415         case IPV6_2292PKTOPTIONS:
 416         {
 417                 struct ipv6_txoptions *opt = NULL;
 418                 struct msghdr msg;
 419                 struct flowi fl;
 420                 int junk;
 421
 422                 fl.fl6_flowlabel = 0;
 423                 fl.oif = sk->sk_bound_dev_if;
 424
 425                 if (optlen == 0)
 426                         goto update;
 427
 428                 /* 1K is probably excessive
 429                  * 1K is surely not enough, 2K per standard header is 16K.
 430                  */
 431                 retv = -EINVAL;
 432                 if (optlen > 64*1024)
 433                         break;
 434
 435                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 436                 retv = -ENOBUFS;
 437                 if (opt == NULL)
 438                         break;
 439
 440                 memset(opt, 0, sizeof(*opt));
 441                 opt->tot_len = sizeof(*opt) + optlen;
 442                 retv = -EFAULT;
 443                 if (copy_from_user(opt+1, optval, optlen))
 444                         goto done;
 445
 446                 msg.msg_controllen = optlen;
 447                 msg.msg_control = (void*)(opt+1);
 448
 449                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
 450                 if (retv)
 451                         goto done;
 452 update:
 453                 retv = 0;
 454                 opt = ipv6_update_options(sk, opt);
 455 done:
 456                 if (opt)
 457                         sock_kfree_s(sk, opt, opt->tot_len);
 458                 break;
 459         }
 460         case IPV6_UNICAST_HOPS:
 461                 if (optlen < sizeof(int))
 462                         goto e_inval;
 463                 if (val > 255 || val < -1)
 464                         goto e_inval;
 465                 np->hop_limit = val;
 466                 retv = 0;
 467                 break;
 468
 469         case IPV6_MULTICAST_HOPS:
 470                 if (sk->sk_type == SOCK_STREAM)
 471                         break;
 472                 if (optlen < sizeof(int))
 473                         goto e_inval;
 474                 if (val > 255 || val < -1)
 475                         goto e_inval;
 476                 np->mcast_hops = val;
 477                 retv = 0;
 478                 break;
 479
 480         case IPV6_MULTICAST_LOOP:
 481                 if (optlen < sizeof(int))
 482                         goto e_inval;
 483                 if (val != valbool)
 484                         goto e_inval;
 485                 np->mc_loop = valbool;
 486                 retv = 0;
 487                 break;
 488
 489         case IPV6_MULTICAST_IF:
 490                 if (sk->sk_type == SOCK_STREAM)
 491                         break;
 492                 if (optlen < sizeof(int))
 493                         goto e_inval;
 494
 495                 if (val) {
 496                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 497                                 goto e_inval;
 498
 499                         if (__dev_get_by_index(net, val) == NULL) {
 500                                 retv = -ENODEV;
 501                                 break;
 502                         }
 503                 }
 504                 np->mcast_oif = val;
 505                 retv = 0;
 506                 break;
 507         case IPV6_ADD_MEMBERSHIP:
 508         case IPV6_DROP_MEMBERSHIP:
 509         {
 510                 struct ipv6_mreq mreq;
 511
 512                 if (optlen < sizeof(struct ipv6_mreq))
 513                         goto e_inval;
 514
 515                 retv = -EPROTO;
 516                 if (inet_sk(sk)->is_icsk)
 517                         break;
 518
 519                 retv = -EFAULT;
 520                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 521                         break;
 522
 523                 if (optname == IPV6_ADD_MEMBERSHIP)
 524                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 525                 else
 526                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 527                 break;
 528         }
 529         case IPV6_JOIN_ANYCAST:
 530         case IPV6_LEAVE_ANYCAST:
 531         {
 532                 struct ipv6_mreq mreq;
 533
 534                 if (optlen < sizeof(struct ipv6_mreq))
 535                         goto e_inval;
 536
 537                 retv = -EFAULT;
 538                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 539                         break;
 540
 541                 if (optname == IPV6_JOIN_ANYCAST)
 542                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 543                 else
 544                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 545                 break;
 546         }
 547         case MCAST_JOIN_GROUP:
 548         case MCAST_LEAVE_GROUP:
 549         {
 550                 struct group_req greq;
 551                 struct sockaddr_in6 *psin6;
 552
 553                 if (optlen < sizeof(struct group_req))
 554                         goto e_inval;
 555
 556                 retv = -EFAULT;
 557                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 558                         break;
 559                 if (greq.gr_group.ss_family != AF_INET6) {
 560                         retv = -EADDRNOTAVAIL;
 561                         break;
 562                 }
 563                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 564                 if (optname == MCAST_JOIN_GROUP)
 565                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 566                                 &psin6->sin6_addr);
 567                 else
 568                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 569                                 &psin6->sin6_addr);
 570                 break;
 571         }
 572         case MCAST_JOIN_SOURCE_GROUP:
 573         case MCAST_LEAVE_SOURCE_GROUP:
 574         case MCAST_BLOCK_SOURCE:
 575         case MCAST_UNBLOCK_SOURCE:
 576         {
 577                 struct group_source_req greqs;
 578                 int omode, add;
 579
 580                 if (optlen < sizeof(struct group_source_req))
 581                         goto e_inval;
 582                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 583                         retv = -EFAULT;
 584                         break;
 585                 }
 586                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 587                     greqs.gsr_source.ss_family != AF_INET6) {
 588                         retv = -EADDRNOTAVAIL;
 589                         break;
 590                 }
 591                 if (optname == MCAST_BLOCK_SOURCE) {
 592                         omode = MCAST_EXCLUDE;
 593                         add = 1;
 594                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 595                         omode = MCAST_EXCLUDE;
 596                         add = 0;
 597                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 598                         struct sockaddr_in6 *psin6;
 599
 600                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 601                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 602                                 &psin6->sin6_addr);
 603                         /* prior join w/ different source is ok */
 604                         if (retv && retv != -EADDRINUSE)
 605                                 break;
 606                         omode = MCAST_INCLUDE;
 607                         add = 1;
 608                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 609                         omode = MCAST_INCLUDE;
 610                         add = 0;
 611                 }
 612                 retv = ip6_mc_source(add, omode, sk, &greqs);
 613                 break;
 614         }
 615         case MCAST_MSFILTER:
 616         {
 617                 extern int sysctl_mld_max_msf;
 618                 struct group_filter *gsf;
 619
 620                 if (optlen < GROUP_FILTER_SIZE(0))
 621                         goto e_inval;
 622                 if (optlen > sysctl_optmem_max) {
 623                         retv = -ENOBUFS;
 624                         break;
 625                 }
 626                 gsf = kmalloc(optlen,GFP_KERNEL);
 627                 if (!gsf) {
 628                         retv = -ENOBUFS;
 629                         break;
 630                 }
 631                 retv = -EFAULT;
 632                 if (copy_from_user(gsf, optval, optlen)) {
 633                         kfree(gsf);
 634                         break;
 635                 }
 636                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 637                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 638                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 639                         kfree(gsf);
 640                         retv = -ENOBUFS;
 641                         break;
 642                 }
 643                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 644                         kfree(gsf);
 645                         retv = -EINVAL;
 646                         break;
 647                 }
 648                 retv = ip6_mc_msfilter(sk, gsf);
 649                 kfree(gsf);
 650
 651                 break;
 652         }
 653         case IPV6_ROUTER_ALERT:
 654                 if (optlen < sizeof(int))
 655                         goto e_inval;
 656                 retv = ip6_ra_control(sk, val);
 657                 break;
 658         case IPV6_MTU_DISCOVER:
 659                 if (optlen < sizeof(int))
 660                         goto e_inval;
 661                 if (val<0 || val>3)
 662                         goto e_inval;
 663                 np->pmtudisc = val;
 664                 retv = 0;
 665                 break;
 666         case IPV6_MTU:
 667                 if (optlen < sizeof(int))
 668                         goto e_inval;
 669                 if (val && val < IPV6_MIN_MTU)
 670                         goto e_inval;
 671                 np->frag_size = val;
 672                 retv = 0;
 673                 break;
 674         case IPV6_RECVERR:
 675                 if (optlen < sizeof(int))
 676                         goto e_inval;
 677                 np->recverr = valbool;
 678                 if (!val)
 679                         skb_queue_purge(&sk->sk_error_queue);
 680                 retv = 0;
 681                 break;
 682         case IPV6_FLOWINFO_SEND:
 683                 if (optlen < sizeof(int))
 684                         goto e_inval;
 685                 np->sndflow = valbool;
 686                 retv = 0;
 687                 break;
 688         case IPV6_FLOWLABEL_MGR:
 689                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 690                 break;
 691         case IPV6_IPSEC_POLICY:
 692         case IPV6_XFRM_POLICY:
 693                 retv = -EPERM;
 694                 if (!capable(CAP_NET_ADMIN))
 695                         break;
 696                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 697                 break;
 698
 699         case IPV6_ADDR_PREFERENCES:
 700             {
 701                 unsigned int pref = 0;
 702                 unsigned int prefmask = ~0;
 703
 704                 if (optlen < sizeof(int))
 705                         goto e_inval;
 706
 707                 retv = -EINVAL;
 708
 709                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 710                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 711                                IPV6_PREFER_SRC_TMP|
 712                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 713                 case IPV6_PREFER_SRC_PUBLIC:
 714                         pref |= IPV6_PREFER_SRC_PUBLIC;
 715                         break;
 716                 case IPV6_PREFER_SRC_TMP:
 717                         pref |= IPV6_PREFER_SRC_TMP;
 718                         break;
 719                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 720                         break;
 721                 case 0:
 722                         goto pref_skip_pubtmp;
 723                 default:
 724                         goto e_inval;
 725                 }
 726
 727                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 728                               IPV6_PREFER_SRC_TMP);
 729 pref_skip_pubtmp:
 730
 731                 /* check HOME/COA conflicts */
 732                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 733                 case IPV6_PREFER_SRC_HOME:
 734                         break;
 735                 case IPV6_PREFER_SRC_COA:
 736                         pref |= IPV6_PREFER_SRC_COA;
 737                 case 0:
 738                         goto pref_skip_coa;
 739                 default:
 740                         goto e_inval;
 741                 }
 742
 743                 prefmask &= ~IPV6_PREFER_SRC_COA;
 744 pref_skip_coa:
 745
 746                 /* check CGA/NONCGA conflicts */
 747                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 748                 case IPV6_PREFER_SRC_CGA:
 749                 case IPV6_PREFER_SRC_NONCGA:
 750                 case 0:
 751                         break;
 752                 default:
 753                         goto e_inval;
 754                 }
 755
 756                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 757                 retv = 0;
 758
 759                 break;
 760             }
 761         }
 762
 763         release_sock(sk);
 764
 765         return retv;
 766
 767 e_inval:
 768         release_sock(sk);
 769         return -EINVAL;
 770 }
 771
 772 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 773                     char __user *optval, int optlen)
 774 {
 775         int err;
 776
 777         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 778                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 779
 780         if (level != SOL_IPV6)
 781                 return -ENOPROTOOPT;
 782
 783         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 784 #ifdef CONFIG_NETFILTER
 785         /* we need to exclude all possible ENOPROTOOPTs except default case */
 786         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 787                         optname != IPV6_XFRM_POLICY) {
 788                 lock_sock(sk);
 789                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 790                                 optlen);
 791                 release_sock(sk);
 792         }
 793 #endif
 794         return err;
 795 }
 796
 797 EXPORT_SYMBOL(ipv6_setsockopt);
 798
 799 #ifdef CONFIG_COMPAT
 800 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 801                            char __user *optval, int optlen)
 802 {
 803         int err;
 804
 805         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 806                 if (udp_prot.compat_setsockopt != NULL)
 807                         return udp_prot.compat_setsockopt(sk, level, optname,
 808                                                           optval, optlen);
 809                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 810         }
 811
 812         if (level != SOL_IPV6)
 813                 return -ENOPROTOOPT;
 814
 815         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 816                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 817                         ipv6_setsockopt);
 818
 819         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 820 #ifdef CONFIG_NETFILTER
 821         /* we need to exclude all possible ENOPROTOOPTs except default case */
 822         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 823             optname != IPV6_XFRM_POLICY) {
 824                 lock_sock(sk);
 825                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 826                                            optval, optlen);
 827                 release_sock(sk);
 828         }
 829 #endif
 830         return err;
 831 }
 832
 833 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 834 #endif
 835
 836 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 837                                   int optname, char __user *optval, int len)
 838 {
 839         struct ipv6_opt_hdr *hdr;
 840
 841         if (!opt)
 842                 return 0;
 843
 844         switch(optname) {
 845         case IPV6_HOPOPTS:
 846                 hdr = opt->hopopt;
 847                 break;
 848         case IPV6_RTHDRDSTOPTS:
 849                 hdr = opt->dst0opt;
 850                 break;
 851         case IPV6_RTHDR:
 852                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 853                 break;
 854         case IPV6_DSTOPTS:
 855                 hdr = opt->dst1opt;
 856                 break;
 857         default:
 858                 return -EINVAL; /* should not happen */
 859         }
 860
 861         if (!hdr)
 862                 return 0;
 863
 864         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 865         if (copy_to_user(optval, hdr, len))
 866                 return -EFAULT;
 867         return len;
 868 }
 869
 870 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 871                     char __user *optval, int __user *optlen)
 872 {
 873         struct ipv6_pinfo *np = inet6_sk(sk);
 874         int len;
 875         int val;
 876
 877         if (ip6_mroute_opt(optname))
 878                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 879
 880         if (get_user(len, optlen))
 881                 return -EFAULT;
 882         switch (optname) {
 883         case IPV6_ADDRFORM:
 884                 if (sk->sk_protocol != IPPROTO_UDP &&
 885                     sk->sk_protocol != IPPROTO_UDPLITE &&
 886                     sk->sk_protocol != IPPROTO_TCP)
 887                         return -ENOPROTOOPT;
 888                 if (sk->sk_state != TCP_ESTABLISHED)
 889                         return -ENOTCONN;
 890                 val = sk->sk_family;
 891                 break;
 892         case MCAST_MSFILTER:
 893         {
 894                 struct group_filter gsf;
 895                 int err;
 896
 897                 if (len < GROUP_FILTER_SIZE(0))
 898                         return -EINVAL;
 899                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 900                         return -EFAULT;
 901                 if (gsf.gf_group.ss_family != AF_INET6)
 902                         return -EADDRNOTAVAIL;
 903                 lock_sock(sk);
 904                 err = ip6_mc_msfget(sk, &gsf,
 905                         (struct group_filter __user *)optval, optlen);
 906                 release_sock(sk);
 907                 return err;
 908         }
 909
 910         case IPV6_2292PKTOPTIONS:
 911         {
 912                 struct msghdr msg;
 913                 struct sk_buff *skb;
 914
 915                 if (sk->sk_type != SOCK_STREAM)
 916                         return -ENOPROTOOPT;
 917
 918                 msg.msg_control = optval;
 919                 msg.msg_controllen = len;
 920                 msg.msg_flags = 0;
 921
 922                 lock_sock(sk);
 923                 skb = np->pktoptions;
 924                 if (skb)
 925                         atomic_inc(&skb->users);
 926                 release_sock(sk);
 927
 928                 if (skb) {
 929                         int err = datagram_recv_ctl(sk, &msg, skb);
 930                         kfree_skb(skb);
 931                         if (err)
 932                                 return err;
 933                 } else {
 934                         if (np->rxopt.bits.rxinfo) {
 935                                 struct in6_pktinfo src_info;
 936                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 937                                         np->sticky_pktinfo.ipi6_ifindex;
 938                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 939                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 940                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 941                         }
 942                         if (np->rxopt.bits.rxhlim) {
 943                                 int hlim = np->mcast_hops;
 944                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 945                         }
 946                         if (np->rxopt.bits.rxoinfo) {
 947                                 struct in6_pktinfo src_info;
 948                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 949                                         np->sticky_pktinfo.ipi6_ifindex;
 950                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 951                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 952                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 953                         }
 954                         if (np->rxopt.bits.rxohlim) {
 955                                 int hlim = np->mcast_hops;
 956                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 957                         }
 958                 }
 959                 len -= msg.msg_controllen;
 960                 return put_user(len, optlen);
 961         }
 962         case IPV6_MTU:
 963         {
 964                 struct dst_entry *dst;
 965                 val = 0;
 966                 lock_sock(sk);
 967                 dst = sk_dst_get(sk);
 968                 if (dst) {
 969                         val = dst_mtu(dst);
 970                         dst_release(dst);
 971                 }
 972                 release_sock(sk);
 973                 if (!val)
 974                         return -ENOTCONN;
 975                 break;
 976         }
 977
 978         case IPV6_V6ONLY:
 979                 val = np->ipv6only;
 980                 break;
 981
 982         case IPV6_RECVPKTINFO:
 983                 val = np->rxopt.bits.rxinfo;
 984                 break;
 985
 986         case IPV6_2292PKTINFO:
 987                 val = np->rxopt.bits.rxoinfo;
 988                 break;
 989
 990         case IPV6_RECVHOPLIMIT:
 991                 val = np->rxopt.bits.rxhlim;
 992                 break;
 993
 994         case IPV6_2292HOPLIMIT:
 995                 val = np->rxopt.bits.rxohlim;
 996                 break;
 997
 998         case IPV6_RECVRTHDR:
 999                 val = np->rxopt.bits.srcrt;
1000                 break;
1001
1002         case IPV6_2292RTHDR:
1003                 val = np->rxopt.bits.osrcrt;
1004                 break;
1005
1006         case IPV6_HOPOPTS:
1007         case IPV6_RTHDRDSTOPTS:
1008         case IPV6_RTHDR:
1009         case IPV6_DSTOPTS:
1010         {
1011
1012                 lock_sock(sk);
1013                 len = ipv6_getsockopt_sticky(sk, np->opt,
1014                                              optname, optval, len);
1015                 release_sock(sk);
1016                 /* check if ipv6_getsockopt_sticky() returns err code */
1017                 if (len < 0)
1018                         return len;
1019                 return put_user(len, optlen);
1020         }
1021
1022         case IPV6_RECVHOPOPTS:
1023                 val = np->rxopt.bits.hopopts;
1024                 break;
1025
1026         case IPV6_2292HOPOPTS:
1027                 val = np->rxopt.bits.ohopopts;
1028                 break;
1029
1030         case IPV6_RECVDSTOPTS:
1031                 val = np->rxopt.bits.dstopts;
1032                 break;
1033
1034         case IPV6_2292DSTOPTS:
1035                 val = np->rxopt.bits.odstopts;
1036                 break;
1037
1038         case IPV6_TCLASS:
1039                 val = np->tclass;
1040                 if (val < 0)
1041                         val = 0;
1042                 break;
1043
1044         case IPV6_RECVTCLASS:
1045                 val = np->rxopt.bits.rxtclass;
1046                 break;
1047
1048         case IPV6_FLOWINFO:
1049                 val = np->rxopt.bits.rxflow;
1050                 break;
1051
1052         case IPV6_UNICAST_HOPS:
1053         case IPV6_MULTICAST_HOPS:
1054         {
1055                 struct dst_entry *dst;
1056
1057                 if (optname == IPV6_UNICAST_HOPS)
1058                         val = np->hop_limit;
1059                 else
1060                         val = np->mcast_hops;
1061
1062                 dst = sk_dst_get(sk);
1063                 if (dst) {
1064                         if (val < 0)
1065                                 val = ip6_dst_hoplimit(dst);
1066                         dst_release(dst);
1067                 }
1068                 if (val < 0)
1069                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1070                 break;
1071         }
1072
1073         case IPV6_MULTICAST_LOOP:
1074                 val = np->mc_loop;
1075                 break;
1076
1077         case IPV6_MULTICAST_IF:
1078                 val = np->mcast_oif;
1079                 break;
1080
1081         case IPV6_MTU_DISCOVER:
1082                 val = np->pmtudisc;
1083                 break;
1084
1085         case IPV6_RECVERR:
1086                 val = np->recverr;
1087                 break;
1088
1089         case IPV6_FLOWINFO_SEND:
1090                 val = np->sndflow;
1091                 break;
1092
1093         case IPV6_ADDR_PREFERENCES:
1094                 val = 0;
1095
1096                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1097                         val |= IPV6_PREFER_SRC_TMP;
1098                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1099                         val |= IPV6_PREFER_SRC_PUBLIC;
1100                 else {
1101                         /* XXX: should we return system default? */
1102                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1103                 }
1104
1105                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1106                         val |= IPV6_PREFER_SRC_COA;
1107                 else
1108                         val |= IPV6_PREFER_SRC_HOME;
1109                 break;
1110
1111         default:
1112                 return -ENOPROTOOPT;
1113         }
1114         len = min_t(unsigned int, sizeof(int), len);
1115         if(put_user(len, optlen))
1116                 return -EFAULT;
1117         if(copy_to_user(optval,&val,len))
1118                 return -EFAULT;
1119         return 0;
1120 }
1121
1122 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1123                     char __user *optval, int __user *optlen)
1124 {
1125         int err;
1126
1127         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1128                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1129
1130         if(level != SOL_IPV6)
1131                 return -ENOPROTOOPT;
1132
1133         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1134 #ifdef CONFIG_NETFILTER
1135         /* we need to exclude all possible ENOPROTOOPTs except default case */
1136         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1137                 int len;
1138
1139                 if (get_user(len, optlen))
1140                         return -EFAULT;
1141
1142                 lock_sock(sk);
1143                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1144                                 &len);
1145                 release_sock(sk);
1146                 if (err >= 0)
1147                         err = put_user(len, optlen);
1148         }
1149 #endif
1150         return err;
1151 }
1152
1153 EXPORT_SYMBOL(ipv6_getsockopt);
1154
1155 #ifdef CONFIG_COMPAT
1156 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1157                            char __user *optval, int __user *optlen)
1158 {
1159         int err;
1160
1161         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1162                 if (udp_prot.compat_getsockopt != NULL)
1163                         return udp_prot.compat_getsockopt(sk, level, optname,
1164                                                           optval, optlen);
1165                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1166         }
1167
1168         if (level != SOL_IPV6)
1169                 return -ENOPROTOOPT;
1170
1171         if (optname == MCAST_MSFILTER)
1172                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1173                         ipv6_getsockopt);
1174
1175         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1176 #ifdef CONFIG_NETFILTER
1177         /* we need to exclude all possible ENOPROTOOPTs except default case */
1178         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1179                 int len;
1180
1181                 if (get_user(len, optlen))
1182                         return -EFAULT;
1183
1184                 lock_sock(sk);
1185                 err = compat_nf_getsockopt(sk, PF_INET6,
1186                                            optname, optval, &len);
1187                 release_sock(sk);
1188                 if (err >= 0)
1189                         err = put_user(len, optlen);
1190         }
1191 #endif
1192         return err;
1193 }
1194
1195 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1196 #endif
1197