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, unsigned 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                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 319                 if (val == -1)
 320                         val = 0;
 321                 np->tclass = val;
 322                 retv = 0;
 323                 break;
 324
 325         case IPV6_RECVTCLASS:
 326                 if (optlen < sizeof(int))
 327                         goto e_inval;
 328                 np->rxopt.bits.rxtclass = valbool;
 329                 retv = 0;
 330                 break;
 331
 332         case IPV6_FLOWINFO:
 333                 if (optlen < sizeof(int))
 334                         goto e_inval;
 335                 np->rxopt.bits.rxflow = valbool;
 336                 retv = 0;
 337                 break;
 338
 339         case IPV6_HOPOPTS:
 340         case IPV6_RTHDRDSTOPTS:
 341         case IPV6_RTHDR:
 342         case IPV6_DSTOPTS:
 343         {
 344                 struct ipv6_txoptions *opt;
 345
 346                 /* remove any sticky options header with a zero option
 347                  * length, per RFC3542.
 348                  */
 349                 if (optlen == 0)
 350                         optval = NULL;
 351                 else if (optval == NULL)
 352                         goto e_inval;
 353                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 354                          optlen & 0x7 || optlen > 8 * 255)
 355                         goto e_inval;
 356
 357                 /* hop-by-hop / destination options are privileged option */
 358                 retv = -EPERM;
 359                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 360                         break;
 361
 362                 opt = ipv6_renew_options(sk, np->opt, optname,
 363                                          (struct ipv6_opt_hdr __user *)optval,
 364                                          optlen);
 365                 if (IS_ERR(opt)) {
 366                         retv = PTR_ERR(opt);
 367                         break;
 368                 }
 369
 370                 /* routing header option needs extra check */
 371                 retv = -EINVAL;
 372                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 373                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 374                         switch (rthdr->type) {
 375 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 376                         case IPV6_SRCRT_TYPE_2:
 377                                 if (rthdr->hdrlen != 2 ||
 378                                     rthdr->segments_left != 1)
 379                                         goto sticky_done;
 380
 381                                 break;
 382 #endif
 383                         default:
 384                                 goto sticky_done;
 385                         }
 386                 }
 387
 388                 retv = 0;
 389                 opt = ipv6_update_options(sk, opt);
 390 sticky_done:
 391                 if (opt)
 392                         sock_kfree_s(sk, opt, opt->tot_len);
 393                 break;
 394         }
 395
 396         case IPV6_PKTINFO:
 397         {
 398                 struct in6_pktinfo pkt;
 399
 400                 if (optlen == 0)
 401                         goto e_inval;
 402                 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
 403                         goto e_inval;
 404
 405                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 406                                 retv = -EFAULT;
 407                                 break;
 408                 }
 409                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 410                         goto e_inval;
 411
 412                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 413                 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
 414                 retv = 0;
 415                 break;
 416         }
 417
 418         case IPV6_2292PKTOPTIONS:
 419         {
 420                 struct ipv6_txoptions *opt = NULL;
 421                 struct msghdr msg;
 422                 struct flowi fl;
 423                 int junk;
 424
 425                 fl.fl6_flowlabel = 0;
 426                 fl.oif = sk->sk_bound_dev_if;
 427
 428                 if (optlen == 0)
 429                         goto update;
 430
 431                 /* 1K is probably excessive
 432                  * 1K is surely not enough, 2K per standard header is 16K.
 433                  */
 434                 retv = -EINVAL;
 435                 if (optlen > 64*1024)
 436                         break;
 437
 438                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 439                 retv = -ENOBUFS;
 440                 if (opt == NULL)
 441                         break;
 442
 443                 memset(opt, 0, sizeof(*opt));
 444                 opt->tot_len = sizeof(*opt) + optlen;
 445                 retv = -EFAULT;
 446                 if (copy_from_user(opt+1, optval, optlen))
 447                         goto done;
 448
 449                 msg.msg_controllen = optlen;
 450                 msg.msg_control = (void*)(opt+1);
 451
 452                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
 453                 if (retv)
 454                         goto done;
 455 update:
 456                 retv = 0;
 457                 opt = ipv6_update_options(sk, opt);
 458 done:
 459                 if (opt)
 460                         sock_kfree_s(sk, opt, opt->tot_len);
 461                 break;
 462         }
 463         case IPV6_UNICAST_HOPS:
 464                 if (optlen < sizeof(int))
 465                         goto e_inval;
 466                 if (val > 255 || val < -1)
 467                         goto e_inval;
 468                 np->hop_limit = val;
 469                 retv = 0;
 470                 break;
 471
 472         case IPV6_MULTICAST_HOPS:
 473                 if (sk->sk_type == SOCK_STREAM)
 474                         break;
 475                 if (optlen < sizeof(int))
 476                         goto e_inval;
 477                 if (val > 255 || val < -1)
 478                         goto e_inval;
 479                 np->mcast_hops = val;
 480                 retv = 0;
 481                 break;
 482
 483         case IPV6_MULTICAST_LOOP:
 484                 if (optlen < sizeof(int))
 485                         goto e_inval;
 486                 if (val != valbool)
 487                         goto e_inval;
 488                 np->mc_loop = valbool;
 489                 retv = 0;
 490                 break;
 491
 492         case IPV6_MULTICAST_IF:
 493                 if (sk->sk_type == SOCK_STREAM)
 494                         break;
 495                 if (optlen < sizeof(int))
 496                         goto e_inval;
 497
 498                 if (val) {
 499                         struct net_device *dev;
 500
 501                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 502                                 goto e_inval;
 503
 504                         dev = dev_get_by_index(net, val);
 505                         if (!dev) {
 506                                 retv = -ENODEV;
 507                                 break;
 508                         }
 509                         dev_put(dev);
 510                 }
 511                 np->mcast_oif = val;
 512                 retv = 0;
 513                 break;
 514         case IPV6_ADD_MEMBERSHIP:
 515         case IPV6_DROP_MEMBERSHIP:
 516         {
 517                 struct ipv6_mreq mreq;
 518
 519                 if (optlen < sizeof(struct ipv6_mreq))
 520                         goto e_inval;
 521
 522                 retv = -EPROTO;
 523                 if (inet_sk(sk)->is_icsk)
 524                         break;
 525
 526                 retv = -EFAULT;
 527                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 528                         break;
 529
 530                 if (optname == IPV6_ADD_MEMBERSHIP)
 531                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 532                 else
 533                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 534                 break;
 535         }
 536         case IPV6_JOIN_ANYCAST:
 537         case IPV6_LEAVE_ANYCAST:
 538         {
 539                 struct ipv6_mreq mreq;
 540
 541                 if (optlen < sizeof(struct ipv6_mreq))
 542                         goto e_inval;
 543
 544                 retv = -EFAULT;
 545                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 546                         break;
 547
 548                 if (optname == IPV6_JOIN_ANYCAST)
 549                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 550                 else
 551                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 552                 break;
 553         }
 554         case MCAST_JOIN_GROUP:
 555         case MCAST_LEAVE_GROUP:
 556         {
 557                 struct group_req greq;
 558                 struct sockaddr_in6 *psin6;
 559
 560                 if (optlen < sizeof(struct group_req))
 561                         goto e_inval;
 562
 563                 retv = -EFAULT;
 564                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 565                         break;
 566                 if (greq.gr_group.ss_family != AF_INET6) {
 567                         retv = -EADDRNOTAVAIL;
 568                         break;
 569                 }
 570                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 571                 if (optname == MCAST_JOIN_GROUP)
 572                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 573                                 &psin6->sin6_addr);
 574                 else
 575                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 576                                 &psin6->sin6_addr);
 577                 break;
 578         }
 579         case MCAST_JOIN_SOURCE_GROUP:
 580         case MCAST_LEAVE_SOURCE_GROUP:
 581         case MCAST_BLOCK_SOURCE:
 582         case MCAST_UNBLOCK_SOURCE:
 583         {
 584                 struct group_source_req greqs;
 585                 int omode, add;
 586
 587                 if (optlen < sizeof(struct group_source_req))
 588                         goto e_inval;
 589                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 590                         retv = -EFAULT;
 591                         break;
 592                 }
 593                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 594                     greqs.gsr_source.ss_family != AF_INET6) {
 595                         retv = -EADDRNOTAVAIL;
 596                         break;
 597                 }
 598                 if (optname == MCAST_BLOCK_SOURCE) {
 599                         omode = MCAST_EXCLUDE;
 600                         add = 1;
 601                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 602                         omode = MCAST_EXCLUDE;
 603                         add = 0;
 604                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 605                         struct sockaddr_in6 *psin6;
 606
 607                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 608                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 609                                 &psin6->sin6_addr);
 610                         /* prior join w/ different source is ok */
 611                         if (retv && retv != -EADDRINUSE)
 612                                 break;
 613                         omode = MCAST_INCLUDE;
 614                         add = 1;
 615                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 616                         omode = MCAST_INCLUDE;
 617                         add = 0;
 618                 }
 619                 retv = ip6_mc_source(add, omode, sk, &greqs);
 620                 break;
 621         }
 622         case MCAST_MSFILTER:
 623         {
 624                 extern int sysctl_mld_max_msf;
 625                 struct group_filter *gsf;
 626
 627                 if (optlen < GROUP_FILTER_SIZE(0))
 628                         goto e_inval;
 629                 if (optlen > sysctl_optmem_max) {
 630                         retv = -ENOBUFS;
 631                         break;
 632                 }
 633                 gsf = kmalloc(optlen,GFP_KERNEL);
 634                 if (!gsf) {
 635                         retv = -ENOBUFS;
 636                         break;
 637                 }
 638                 retv = -EFAULT;
 639                 if (copy_from_user(gsf, optval, optlen)) {
 640                         kfree(gsf);
 641                         break;
 642                 }
 643                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 644                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 645                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 646                         kfree(gsf);
 647                         retv = -ENOBUFS;
 648                         break;
 649                 }
 650                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 651                         kfree(gsf);
 652                         retv = -EINVAL;
 653                         break;
 654                 }
 655                 retv = ip6_mc_msfilter(sk, gsf);
 656                 kfree(gsf);
 657
 658                 break;
 659         }
 660         case IPV6_ROUTER_ALERT:
 661                 if (optlen < sizeof(int))
 662                         goto e_inval;
 663                 retv = ip6_ra_control(sk, val);
 664                 break;
 665         case IPV6_MTU_DISCOVER:
 666                 if (optlen < sizeof(int))
 667                         goto e_inval;
 668                 if (val<0 || val>3)
 669                         goto e_inval;
 670                 np->pmtudisc = val;
 671                 retv = 0;
 672                 break;
 673         case IPV6_MTU:
 674                 if (optlen < sizeof(int))
 675                         goto e_inval;
 676                 if (val && val < IPV6_MIN_MTU)
 677                         goto e_inval;
 678                 np->frag_size = val;
 679                 retv = 0;
 680                 break;
 681         case IPV6_RECVERR:
 682                 if (optlen < sizeof(int))
 683                         goto e_inval;
 684                 np->recverr = valbool;
 685                 if (!val)
 686                         skb_queue_purge(&sk->sk_error_queue);
 687                 retv = 0;
 688                 break;
 689         case IPV6_FLOWINFO_SEND:
 690                 if (optlen < sizeof(int))
 691                         goto e_inval;
 692                 np->sndflow = valbool;
 693                 retv = 0;
 694                 break;
 695         case IPV6_FLOWLABEL_MGR:
 696                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 697                 break;
 698         case IPV6_IPSEC_POLICY:
 699         case IPV6_XFRM_POLICY:
 700                 retv = -EPERM;
 701                 if (!capable(CAP_NET_ADMIN))
 702                         break;
 703                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 704                 break;
 705
 706         case IPV6_ADDR_PREFERENCES:
 707             {
 708                 unsigned int pref = 0;
 709                 unsigned int prefmask = ~0;
 710
 711                 if (optlen < sizeof(int))
 712                         goto e_inval;
 713
 714                 retv = -EINVAL;
 715
 716                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 717                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 718                                IPV6_PREFER_SRC_TMP|
 719                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 720                 case IPV6_PREFER_SRC_PUBLIC:
 721                         pref |= IPV6_PREFER_SRC_PUBLIC;
 722                         break;
 723                 case IPV6_PREFER_SRC_TMP:
 724                         pref |= IPV6_PREFER_SRC_TMP;
 725                         break;
 726                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 727                         break;
 728                 case 0:
 729                         goto pref_skip_pubtmp;
 730                 default:
 731                         goto e_inval;
 732                 }
 733
 734                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 735                               IPV6_PREFER_SRC_TMP);
 736 pref_skip_pubtmp:
 737
 738                 /* check HOME/COA conflicts */
 739                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 740                 case IPV6_PREFER_SRC_HOME:
 741                         break;
 742                 case IPV6_PREFER_SRC_COA:
 743                         pref |= IPV6_PREFER_SRC_COA;
 744                 case 0:
 745                         goto pref_skip_coa;
 746                 default:
 747                         goto e_inval;
 748                 }
 749
 750                 prefmask &= ~IPV6_PREFER_SRC_COA;
 751 pref_skip_coa:
 752
 753                 /* check CGA/NONCGA conflicts */
 754                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 755                 case IPV6_PREFER_SRC_CGA:
 756                 case IPV6_PREFER_SRC_NONCGA:
 757                 case 0:
 758                         break;
 759                 default:
 760                         goto e_inval;
 761                 }
 762
 763                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 764                 retv = 0;
 765
 766                 break;
 767             }
 768         }
 769
 770         release_sock(sk);
 771
 772         return retv;
 773
 774 e_inval:
 775         release_sock(sk);
 776         return -EINVAL;
 777 }
 778
 779 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 780                     char __user *optval, unsigned int optlen)
 781 {
 782         int err;
 783
 784         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 785                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 786
 787         if (level != SOL_IPV6)
 788                 return -ENOPROTOOPT;
 789
 790         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 791 #ifdef CONFIG_NETFILTER
 792         /* we need to exclude all possible ENOPROTOOPTs except default case */
 793         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 794                         optname != IPV6_XFRM_POLICY) {
 795                 lock_sock(sk);
 796                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 797                                 optlen);
 798                 release_sock(sk);
 799         }
 800 #endif
 801         return err;
 802 }
 803
 804 EXPORT_SYMBOL(ipv6_setsockopt);
 805
 806 #ifdef CONFIG_COMPAT
 807 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 808                            char __user *optval, unsigned int optlen)
 809 {
 810         int err;
 811
 812         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 813                 if (udp_prot.compat_setsockopt != NULL)
 814                         return udp_prot.compat_setsockopt(sk, level, optname,
 815                                                           optval, optlen);
 816                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 817         }
 818
 819         if (level != SOL_IPV6)
 820                 return -ENOPROTOOPT;
 821
 822         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 823                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 824                         ipv6_setsockopt);
 825
 826         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 827 #ifdef CONFIG_NETFILTER
 828         /* we need to exclude all possible ENOPROTOOPTs except default case */
 829         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 830             optname != IPV6_XFRM_POLICY) {
 831                 lock_sock(sk);
 832                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 833                                            optval, optlen);
 834                 release_sock(sk);
 835         }
 836 #endif
 837         return err;
 838 }
 839
 840 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 841 #endif
 842
 843 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 844                                   int optname, char __user *optval, int len)
 845 {
 846         struct ipv6_opt_hdr *hdr;
 847
 848         if (!opt)
 849                 return 0;
 850
 851         switch(optname) {
 852         case IPV6_HOPOPTS:
 853                 hdr = opt->hopopt;
 854                 break;
 855         case IPV6_RTHDRDSTOPTS:
 856                 hdr = opt->dst0opt;
 857                 break;
 858         case IPV6_RTHDR:
 859                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 860                 break;
 861         case IPV6_DSTOPTS:
 862                 hdr = opt->dst1opt;
 863                 break;
 864         default:
 865                 return -EINVAL; /* should not happen */
 866         }
 867
 868         if (!hdr)
 869                 return 0;
 870
 871         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 872         if (copy_to_user(optval, hdr, len))
 873                 return -EFAULT;
 874         return len;
 875 }
 876
 877 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 878                     char __user *optval, int __user *optlen)
 879 {
 880         struct ipv6_pinfo *np = inet6_sk(sk);
 881         int len;
 882         int val;
 883
 884         if (ip6_mroute_opt(optname))
 885                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 886
 887         if (get_user(len, optlen))
 888                 return -EFAULT;
 889         switch (optname) {
 890         case IPV6_ADDRFORM:
 891                 if (sk->sk_protocol != IPPROTO_UDP &&
 892                     sk->sk_protocol != IPPROTO_UDPLITE &&
 893                     sk->sk_protocol != IPPROTO_TCP)
 894                         return -ENOPROTOOPT;
 895                 if (sk->sk_state != TCP_ESTABLISHED)
 896                         return -ENOTCONN;
 897                 val = sk->sk_family;
 898                 break;
 899         case MCAST_MSFILTER:
 900         {
 901                 struct group_filter gsf;
 902                 int err;
 903
 904                 if (len < GROUP_FILTER_SIZE(0))
 905                         return -EINVAL;
 906                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 907                         return -EFAULT;
 908                 if (gsf.gf_group.ss_family != AF_INET6)
 909                         return -EADDRNOTAVAIL;
 910                 lock_sock(sk);
 911                 err = ip6_mc_msfget(sk, &gsf,
 912                         (struct group_filter __user *)optval, optlen);
 913                 release_sock(sk);
 914                 return err;
 915         }
 916
 917         case IPV6_2292PKTOPTIONS:
 918         {
 919                 struct msghdr msg;
 920                 struct sk_buff *skb;
 921
 922                 if (sk->sk_type != SOCK_STREAM)
 923                         return -ENOPROTOOPT;
 924
 925                 msg.msg_control = optval;
 926                 msg.msg_controllen = len;
 927                 msg.msg_flags = 0;
 928
 929                 lock_sock(sk);
 930                 skb = np->pktoptions;
 931                 if (skb)
 932                         atomic_inc(&skb->users);
 933                 release_sock(sk);
 934
 935                 if (skb) {
 936                         int err = datagram_recv_ctl(sk, &msg, skb);
 937                         kfree_skb(skb);
 938                         if (err)
 939                                 return err;
 940                 } else {
 941                         if (np->rxopt.bits.rxinfo) {
 942                                 struct in6_pktinfo src_info;
 943                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 944                                         np->sticky_pktinfo.ipi6_ifindex;
 945                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 946                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 947                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 948                         }
 949                         if (np->rxopt.bits.rxhlim) {
 950                                 int hlim = np->mcast_hops;
 951                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 952                         }
 953                         if (np->rxopt.bits.rxoinfo) {
 954                                 struct in6_pktinfo src_info;
 955                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 956                                         np->sticky_pktinfo.ipi6_ifindex;
 957                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 958                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 959                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 960                         }
 961                         if (np->rxopt.bits.rxohlim) {
 962                                 int hlim = np->mcast_hops;
 963                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 964                         }
 965                 }
 966                 len -= msg.msg_controllen;
 967                 return put_user(len, optlen);
 968         }
 969         case IPV6_MTU:
 970         {
 971                 struct dst_entry *dst;
 972                 val = 0;
 973                 lock_sock(sk);
 974                 dst = sk_dst_get(sk);
 975                 if (dst) {
 976                         val = dst_mtu(dst);
 977                         dst_release(dst);
 978                 }
 979                 release_sock(sk);
 980                 if (!val)
 981                         return -ENOTCONN;
 982                 break;
 983         }
 984
 985         case IPV6_V6ONLY:
 986                 val = np->ipv6only;
 987                 break;
 988
 989         case IPV6_RECVPKTINFO:
 990                 val = np->rxopt.bits.rxinfo;
 991                 break;
 992
 993         case IPV6_2292PKTINFO:
 994                 val = np->rxopt.bits.rxoinfo;
 995                 break;
 996
 997         case IPV6_RECVHOPLIMIT:
 998                 val = np->rxopt.bits.rxhlim;
 999                 break;
1000
1001         case IPV6_2292HOPLIMIT:
1002                 val = np->rxopt.bits.rxohlim;
1003                 break;
1004
1005         case IPV6_RECVRTHDR:
1006                 val = np->rxopt.bits.srcrt;
1007                 break;
1008
1009         case IPV6_2292RTHDR:
1010                 val = np->rxopt.bits.osrcrt;
1011                 break;
1012
1013         case IPV6_HOPOPTS:
1014         case IPV6_RTHDRDSTOPTS:
1015         case IPV6_RTHDR:
1016         case IPV6_DSTOPTS:
1017         {
1018
1019                 lock_sock(sk);
1020                 len = ipv6_getsockopt_sticky(sk, np->opt,
1021                                              optname, optval, len);
1022                 release_sock(sk);
1023                 /* check if ipv6_getsockopt_sticky() returns err code */
1024                 if (len < 0)
1025                         return len;
1026                 return put_user(len, optlen);
1027         }
1028
1029         case IPV6_RECVHOPOPTS:
1030                 val = np->rxopt.bits.hopopts;
1031                 break;
1032
1033         case IPV6_2292HOPOPTS:
1034                 val = np->rxopt.bits.ohopopts;
1035                 break;
1036
1037         case IPV6_RECVDSTOPTS:
1038                 val = np->rxopt.bits.dstopts;
1039                 break;
1040
1041         case IPV6_2292DSTOPTS:
1042                 val = np->rxopt.bits.odstopts;
1043                 break;
1044
1045         case IPV6_TCLASS:
1046                 val = np->tclass;
1047                 break;
1048
1049         case IPV6_RECVTCLASS:
1050                 val = np->rxopt.bits.rxtclass;
1051                 break;
1052
1053         case IPV6_FLOWINFO:
1054                 val = np->rxopt.bits.rxflow;
1055                 break;
1056
1057         case IPV6_UNICAST_HOPS:
1058         case IPV6_MULTICAST_HOPS:
1059         {
1060                 struct dst_entry *dst;
1061
1062                 if (optname == IPV6_UNICAST_HOPS)
1063                         val = np->hop_limit;
1064                 else
1065                         val = np->mcast_hops;
1066
1067                 dst = sk_dst_get(sk);
1068                 if (dst) {
1069                         if (val < 0)
1070                                 val = ip6_dst_hoplimit(dst);
1071                         dst_release(dst);
1072                 }
1073                 if (val < 0)
1074                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1075                 break;
1076         }
1077
1078         case IPV6_MULTICAST_LOOP:
1079                 val = np->mc_loop;
1080                 break;
1081
1082         case IPV6_MULTICAST_IF:
1083                 val = np->mcast_oif;
1084                 break;
1085
1086         case IPV6_MTU_DISCOVER:
1087                 val = np->pmtudisc;
1088                 break;
1089
1090         case IPV6_RECVERR:
1091                 val = np->recverr;
1092                 break;
1093
1094         case IPV6_FLOWINFO_SEND:
1095                 val = np->sndflow;
1096                 break;
1097
1098         case IPV6_ADDR_PREFERENCES:
1099                 val = 0;
1100
1101                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1102                         val |= IPV6_PREFER_SRC_TMP;
1103                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1104                         val |= IPV6_PREFER_SRC_PUBLIC;
1105                 else {
1106                         /* XXX: should we return system default? */
1107                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1108                 }
1109
1110                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1111                         val |= IPV6_PREFER_SRC_COA;
1112                 else
1113                         val |= IPV6_PREFER_SRC_HOME;
1114                 break;
1115
1116         default:
1117                 return -ENOPROTOOPT;
1118         }
1119         len = min_t(unsigned int, sizeof(int), len);
1120         if(put_user(len, optlen))
1121                 return -EFAULT;
1122         if(copy_to_user(optval,&val,len))
1123                 return -EFAULT;
1124         return 0;
1125 }
1126
1127 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1128                     char __user *optval, int __user *optlen)
1129 {
1130         int err;
1131
1132         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1133                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1134
1135         if(level != SOL_IPV6)
1136                 return -ENOPROTOOPT;
1137
1138         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1139 #ifdef CONFIG_NETFILTER
1140         /* we need to exclude all possible ENOPROTOOPTs except default case */
1141         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1142                 int len;
1143
1144                 if (get_user(len, optlen))
1145                         return -EFAULT;
1146
1147                 lock_sock(sk);
1148                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1149                                 &len);
1150                 release_sock(sk);
1151                 if (err >= 0)
1152                         err = put_user(len, optlen);
1153         }
1154 #endif
1155         return err;
1156 }
1157
1158 EXPORT_SYMBOL(ipv6_getsockopt);
1159
1160 #ifdef CONFIG_COMPAT
1161 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1162                            char __user *optval, int __user *optlen)
1163 {
1164         int err;
1165
1166         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1167                 if (udp_prot.compat_getsockopt != NULL)
1168                         return udp_prot.compat_getsockopt(sk, level, optname,
1169                                                           optval, optlen);
1170                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1171         }
1172
1173         if (level != SOL_IPV6)
1174                 return -ENOPROTOOPT;
1175
1176         if (optname == MCAST_MSFILTER)
1177                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1178                         ipv6_getsockopt);
1179
1180         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1181 #ifdef CONFIG_NETFILTER
1182         /* we need to exclude all possible ENOPROTOOPTs except default case */
1183         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1184                 int len;
1185
1186                 if (get_user(len, optlen))
1187                         return -EFAULT;
1188
1189                 lock_sock(sk);
1190                 err = compat_nf_getsockopt(sk, PF_INET6,
1191                                            optname, optval, &len);
1192                 release_sock(sk);
1193                 if (err >= 0)
1194                         err = put_user(len, optlen);
1195         }
1196 #endif
1197         return err;
1198 }
1199
1200 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1201 #endif
1202