SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      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 #include <linux/slab.h>
  40
  41 #include <net/sock.h>
  42 #include <net/snmp.h>
  43 #include <net/ipv6.h>
  44 #include <net/ndisc.h>
  45 #include <net/protocol.h>
  46 #include <net/transp_v6.h>
  47 #include <net/ip6_route.h>
  48 #include <net/addrconf.h>
  49 #include <net/inet_common.h>
  50 #include <net/tcp.h>
  51 #include <net/udp.h>
  52 #include <net/udplite.h>
  53 #include <net/xfrm.h>
  54 #include <net/compat.h>
  55
  56 #include <asm/uaccess.h>
  57
  58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  59
  60 struct ip6_ra_chain *ip6_ra_chain;
  61 DEFINE_RWLOCK(ip6_ra_lock);
  62
  63 int ip6_ra_control(struct sock *sk, int sel)
  64 {
  65         struct ip6_ra_chain *ra, *new_ra, **rap;
  66
  67         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  68         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  69                 return -ENOPROTOOPT;
  70
  71         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  72
  73         write_lock_bh(&ip6_ra_lock);
  74         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  75                 if (ra->sk == sk) {
  76                         if (sel>=0) {
  77                                 write_unlock_bh(&ip6_ra_lock);
  78                                 kfree(new_ra);
  79                                 return -EADDRINUSE;
  80                         }
  81
  82                         *rap = ra->next;
  83                         write_unlock_bh(&ip6_ra_lock);
  84
  85                         sock_put(sk);
  86                         kfree(ra);
  87                         return 0;
  88                 }
  89         }
  90         if (new_ra == NULL) {
  91                 write_unlock_bh(&ip6_ra_lock);
  92                 return -ENOBUFS;
  93         }
  94         new_ra->sk = sk;
  95         new_ra->sel = sel;
  96         new_ra->next = ra;
  97         *rap = new_ra;
  98         sock_hold(sk);
  99         write_unlock_bh(&ip6_ra_lock);
 100         return 0;
 101 }
 102
 103 static
 104 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 105                                            struct ipv6_txoptions *opt)
 106 {
 107         if (inet_sk(sk)->is_icsk) {
 108                 if (opt &&
 109                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 110                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 111                         struct inet_connection_sock *icsk = inet_csk(sk);
 112                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 113                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 114                 }
 115                 opt = xchg(&inet6_sk(sk)->opt, opt);
 116         } else {
 117                 write_lock(&sk->sk_dst_lock);
 118                 opt = xchg(&inet6_sk(sk)->opt, opt);
 119                 write_unlock(&sk->sk_dst_lock);
 120         }
 121         sk_dst_reset(sk);
 122
 123         return opt;
 124 }
 125
 126 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 127                     char __user *optval, unsigned int optlen)
 128 {
 129         struct ipv6_pinfo *np = inet6_sk(sk);
 130         struct net *net = sock_net(sk);
 131         int val, valbool;
 132         int retv = -ENOPROTOOPT;
 133
 134         if (optval == NULL)
 135                 val=0;
 136         else {
 137                 if (optlen >= sizeof(int)) {
 138                         if (get_user(val, (int __user *) optval))
 139                                 return -EFAULT;
 140                 } else
 141                         val = 0;
 142         }
 143
 144         valbool = (val!=0);
 145
 146         if (ip6_mroute_opt(optname))
 147                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 148
 149         lock_sock(sk);
 150
 151         switch (optname) {
 152
 153         case IPV6_ADDRFORM:
 154                 if (optlen < sizeof(int))
 155                         goto e_inval;
 156                 if (val == PF_INET) {
 157                         struct ipv6_txoptions *opt;
 158                         struct sk_buff *pktopt;
 159
 160                         if (sk->sk_type == SOCK_RAW)
 161                                 break;
 162
 163                         if (sk->sk_protocol == IPPROTO_UDP ||
 164                             sk->sk_protocol == IPPROTO_UDPLITE) {
 165                                 struct udp_sock *up = udp_sk(sk);
 166                                 if (up->pending == AF_INET6) {
 167                                         retv = -EBUSY;
 168                                         break;
 169                                 }
 170                         } else if (sk->sk_protocol != IPPROTO_TCP)
 171                                 break;
 172
 173                         if (sk->sk_state != TCP_ESTABLISHED) {
 174                                 retv = -ENOTCONN;
 175                                 break;
 176                         }
 177
 178                         if (ipv6_only_sock(sk) ||
 179                             !ipv6_addr_v4mapped(&np->daddr)) {
 180                                 retv = -EADDRNOTAVAIL;
 181                                 break;
 182                         }
 183
 184                         fl6_free_socklist(sk);
 185                         ipv6_sock_mc_close(sk);
 186
 187                         /*
 188                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 189                          * remove it from the refcnt debug socks count in the
 190                          * original family...
 191                          */
 192                         sk_refcnt_debug_dec(sk);
 193
 194                         if (sk->sk_protocol == IPPROTO_TCP) {
 195                                 struct inet_connection_sock *icsk = inet_csk(sk);
 196                                 local_bh_disable();
 197                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 198                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 199                                 local_bh_enable();
 200                                 sk->sk_prot = &tcp_prot;
 201                                 icsk->icsk_af_ops = &ipv4_specific;
 202                                 sk->sk_socket->ops = &inet_stream_ops;
 203                                 sk->sk_family = PF_INET;
 204                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 205                         } else {
 206                                 struct proto *prot = &udp_prot;
 207
 208                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 209                                         prot = &udplite_prot;
 210                                 local_bh_disable();
 211                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 212                                 sock_prot_inuse_add(net, prot, 1);
 213                                 local_bh_enable();
 214                                 sk->sk_prot = prot;
 215                                 sk->sk_socket->ops = &inet_dgram_ops;
 216                                 sk->sk_family = PF_INET;
 217                         }
 218                         opt = xchg(&np->opt, NULL);
 219                         if (opt)
 220                                 sock_kfree_s(sk, opt, opt->tot_len);
 221                         pktopt = xchg(&np->pktoptions, NULL);
 222                         kfree_skb(pktopt);
 223
 224                         sk->sk_destruct = inet_sock_destruct;
 225                         /*
 226                          * ... and add it to the refcnt debug socks count
 227                          * in the new family. -acme
 228                          */
 229                         sk_refcnt_debug_inc(sk);
 230                         module_put(THIS_MODULE);
 231                         retv = 0;
 232                         break;
 233                 }
 234                 goto e_inval;
 235
 236         case IPV6_V6ONLY:
 237                 if (optlen < sizeof(int) ||
 238                     inet_sk(sk)->inet_num)
 239                         goto e_inval;
 240                 np->ipv6only = valbool;
 241                 retv = 0;
 242                 break;
 243
 244         case IPV6_RECVPKTINFO:
 245                 if (optlen < sizeof(int))
 246                         goto e_inval;
 247                 np->rxopt.bits.rxinfo = valbool;
 248                 retv = 0;
 249                 break;
 250
 251         case IPV6_2292PKTINFO:
 252                 if (optlen < sizeof(int))
 253                         goto e_inval;
 254                 np->rxopt.bits.rxoinfo = valbool;
 255                 retv = 0;
 256                 break;
 257
 258         case IPV6_RECVHOPLIMIT:
 259                 if (optlen < sizeof(int))
 260                         goto e_inval;
 261                 np->rxopt.bits.rxhlim = valbool;
 262                 retv = 0;
 263                 break;
 264
 265         case IPV6_2292HOPLIMIT:
 266                 if (optlen < sizeof(int))
 267                         goto e_inval;
 268                 np->rxopt.bits.rxohlim = valbool;
 269                 retv = 0;
 270                 break;
 271
 272         case IPV6_RECVRTHDR:
 273                 if (optlen < sizeof(int))
 274                         goto e_inval;
 275                 np->rxopt.bits.srcrt = valbool;
 276                 retv = 0;
 277                 break;
 278
 279         case IPV6_2292RTHDR:
 280                 if (optlen < sizeof(int))
 281                         goto e_inval;
 282                 np->rxopt.bits.osrcrt = valbool;
 283                 retv = 0;
 284                 break;
 285
 286         case IPV6_RECVHOPOPTS:
 287                 if (optlen < sizeof(int))
 288                         goto e_inval;
 289                 np->rxopt.bits.hopopts = valbool;
 290                 retv = 0;
 291                 break;
 292
 293         case IPV6_2292HOPOPTS:
 294                 if (optlen < sizeof(int))
 295                         goto e_inval;
 296                 np->rxopt.bits.ohopopts = valbool;
 297                 retv = 0;
 298                 break;
 299
 300         case IPV6_RECVDSTOPTS:
 301                 if (optlen < sizeof(int))
 302                         goto e_inval;
 303                 np->rxopt.bits.dstopts = valbool;
 304                 retv = 0;
 305                 break;
 306
 307         case IPV6_2292DSTOPTS:
 308                 if (optlen < sizeof(int))
 309                         goto e_inval;
 310                 np->rxopt.bits.odstopts = valbool;
 311                 retv = 0;
 312                 break;
 313
 314         case IPV6_TCLASS:
 315                 if (optlen < sizeof(int))
 316                         goto e_inval;
 317                 if (val < -1 || val > 0xff)
 318                         goto e_inval;
 319                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 320                 if (val == -1)
 321                         val = 0;
 322                 np->tclass = val;
 323                 retv = 0;
 324                 break;
 325
 326         case IPV6_RECVTCLASS:
 327                 if (optlen < sizeof(int))
 328                         goto e_inval;
 329                 np->rxopt.bits.rxtclass = valbool;
 330                 retv = 0;
 331                 break;
 332
 333         case IPV6_FLOWINFO:
 334                 if (optlen < sizeof(int))
 335                         goto e_inval;
 336                 np->rxopt.bits.rxflow = valbool;
 337                 retv = 0;
 338                 break;
 339
 340         case IPV6_HOPOPTS:
 341         case IPV6_RTHDRDSTOPTS:
 342         case IPV6_RTHDR:
 343         case IPV6_DSTOPTS:
 344         {
 345                 struct ipv6_txoptions *opt;
 346
 347                 /* remove any sticky options header with a zero option
 348                  * length, per RFC3542.
 349                  */
 350                 if (optlen == 0)
 351                         optval = NULL;
 352                 else if (optval == NULL)
 353                         goto e_inval;
 354                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 355                          optlen & 0x7 || optlen > 8 * 255)
 356                         goto e_inval;
 357
 358                 /* hop-by-hop / destination options are privileged option */
 359                 retv = -EPERM;
 360                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 361                         break;
 362
 363                 opt = ipv6_renew_options(sk, np->opt, optname,
 364                                          (struct ipv6_opt_hdr __user *)optval,
 365                                          optlen);
 366                 if (IS_ERR(opt)) {
 367                         retv = PTR_ERR(opt);
 368                         break;
 369                 }
 370
 371                 /* routing header option needs extra check */
 372                 retv = -EINVAL;
 373                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 374                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 375                         switch (rthdr->type) {
 376 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 377                         case IPV6_SRCRT_TYPE_2:
 378                                 if (rthdr->hdrlen != 2 ||
 379                                     rthdr->segments_left != 1)
 380                                         goto sticky_done;
 381
 382                                 break;
 383 #endif
 384                         default:
 385                                 goto sticky_done;
 386                         }
 387                 }
 388
 389                 retv = 0;
 390                 opt = ipv6_update_options(sk, opt);
 391 sticky_done:
 392                 if (opt)
 393                         sock_kfree_s(sk, opt, opt->tot_len);
 394                 break;
 395         }
 396
 397         case IPV6_PKTINFO:
 398         {
 399                 struct in6_pktinfo pkt;
 400
 401                 if (optlen == 0)
 402                         goto e_inval;
 403                 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
 404                         goto e_inval;
 405
 406                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 407                                 retv = -EFAULT;
 408                                 break;
 409                 }
 410                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 411                         goto e_inval;
 412
 413                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 414                 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
 415                 retv = 0;
 416                 break;
 417         }
 418
 419         case IPV6_2292PKTOPTIONS:
 420         {
 421                 struct ipv6_txoptions *opt = NULL;
 422                 struct msghdr msg;
 423                 struct flowi fl;
 424                 int junk;
 425
 426                 fl.fl6_flowlabel = 0;
 427                 fl.oif = sk->sk_bound_dev_if;
 428                 fl.mark = sk->sk_mark;
 429
 430                 if (optlen == 0)
 431                         goto update;
 432
 433                 /* 1K is probably excessive
 434                  * 1K is surely not enough, 2K per standard header is 16K.
 435                  */
 436                 retv = -EINVAL;
 437                 if (optlen > 64*1024)
 438                         break;
 439
 440                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 441                 retv = -ENOBUFS;
 442                 if (opt == NULL)
 443                         break;
 444
 445                 memset(opt, 0, sizeof(*opt));
 446                 opt->tot_len = sizeof(*opt) + optlen;
 447                 retv = -EFAULT;
 448                 if (copy_from_user(opt+1, optval, optlen))
 449                         goto done;
 450
 451                 msg.msg_controllen = optlen;
 452                 msg.msg_control = (void*)(opt+1);
 453
 454                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
 455                 if (retv)
 456                         goto done;
 457 update:
 458                 retv = 0;
 459                 opt = ipv6_update_options(sk, opt);
 460 done:
 461                 if (opt)
 462                         sock_kfree_s(sk, opt, opt->tot_len);
 463                 break;
 464         }
 465         case IPV6_UNICAST_HOPS:
 466                 if (optlen < sizeof(int))
 467                         goto e_inval;
 468                 if (val > 255 || val < -1)
 469                         goto e_inval;
 470                 np->hop_limit = val;
 471                 retv = 0;
 472                 break;
 473
 474         case IPV6_MULTICAST_HOPS:
 475                 if (sk->sk_type == SOCK_STREAM)
 476                         break;
 477                 if (optlen < sizeof(int))
 478                         goto e_inval;
 479                 if (val > 255 || val < -1)
 480                         goto e_inval;
 481                 np->mcast_hops = val;
 482                 retv = 0;
 483                 break;
 484
 485         case IPV6_MULTICAST_LOOP:
 486                 if (optlen < sizeof(int))
 487                         goto e_inval;
 488                 if (val != valbool)
 489                         goto e_inval;
 490                 np->mc_loop = valbool;
 491                 retv = 0;
 492                 break;
 493
 494         case IPV6_MULTICAST_IF:
 495                 if (sk->sk_type == SOCK_STREAM)
 496                         break;
 497                 if (optlen < sizeof(int))
 498                         goto e_inval;
 499
 500                 if (val) {
 501                         struct net_device *dev;
 502
 503                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 504                                 goto e_inval;
 505
 506                         dev = dev_get_by_index(net, val);
 507                         if (!dev) {
 508                                 retv = -ENODEV;
 509                                 break;
 510                         }
 511                         dev_put(dev);
 512                 }
 513                 np->mcast_oif = val;
 514                 retv = 0;
 515                 break;
 516         case IPV6_ADD_MEMBERSHIP:
 517         case IPV6_DROP_MEMBERSHIP:
 518         {
 519                 struct ipv6_mreq mreq;
 520
 521                 if (optlen < sizeof(struct ipv6_mreq))
 522                         goto e_inval;
 523
 524                 retv = -EPROTO;
 525                 if (inet_sk(sk)->is_icsk)
 526                         break;
 527
 528                 retv = -EFAULT;
 529                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 530                         break;
 531
 532                 if (optname == IPV6_ADD_MEMBERSHIP)
 533                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 534                 else
 535                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 536                 break;
 537         }
 538         case IPV6_JOIN_ANYCAST:
 539         case IPV6_LEAVE_ANYCAST:
 540         {
 541                 struct ipv6_mreq mreq;
 542
 543                 if (optlen < sizeof(struct ipv6_mreq))
 544                         goto e_inval;
 545
 546                 retv = -EFAULT;
 547                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 548                         break;
 549
 550                 if (optname == IPV6_JOIN_ANYCAST)
 551                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 552                 else
 553                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 554                 break;
 555         }
 556         case MCAST_JOIN_GROUP:
 557         case MCAST_LEAVE_GROUP:
 558         {
 559                 struct group_req greq;
 560                 struct sockaddr_in6 *psin6;
 561
 562                 if (optlen < sizeof(struct group_req))
 563                         goto e_inval;
 564
 565                 retv = -EFAULT;
 566                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 567                         break;
 568                 if (greq.gr_group.ss_family != AF_INET6) {
 569                         retv = -EADDRNOTAVAIL;
 570                         break;
 571                 }
 572                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 573                 if (optname == MCAST_JOIN_GROUP)
 574                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 575                                 &psin6->sin6_addr);
 576                 else
 577                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 578                                 &psin6->sin6_addr);
 579                 break;
 580         }
 581         case MCAST_JOIN_SOURCE_GROUP:
 582         case MCAST_LEAVE_SOURCE_GROUP:
 583         case MCAST_BLOCK_SOURCE:
 584         case MCAST_UNBLOCK_SOURCE:
 585         {
 586                 struct group_source_req greqs;
 587                 int omode, add;
 588
 589                 if (optlen < sizeof(struct group_source_req))
 590                         goto e_inval;
 591                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 592                         retv = -EFAULT;
 593                         break;
 594                 }
 595                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 596                     greqs.gsr_source.ss_family != AF_INET6) {
 597                         retv = -EADDRNOTAVAIL;
 598                         break;
 599                 }
 600                 if (optname == MCAST_BLOCK_SOURCE) {
 601                         omode = MCAST_EXCLUDE;
 602                         add = 1;
 603                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 604                         omode = MCAST_EXCLUDE;
 605                         add = 0;
 606                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 607                         struct sockaddr_in6 *psin6;
 608
 609                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 610                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 611                                 &psin6->sin6_addr);
 612                         /* prior join w/ different source is ok */
 613                         if (retv && retv != -EADDRINUSE)
 614                                 break;
 615                         omode = MCAST_INCLUDE;
 616                         add = 1;
 617                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 618                         omode = MCAST_INCLUDE;
 619                         add = 0;
 620                 }
 621                 retv = ip6_mc_source(add, omode, sk, &greqs);
 622                 break;
 623         }
 624         case MCAST_MSFILTER:
 625         {
 626                 extern int sysctl_mld_max_msf;
 627                 struct group_filter *gsf;
 628
 629                 if (optlen < GROUP_FILTER_SIZE(0))
 630                         goto e_inval;
 631                 if (optlen > sysctl_optmem_max) {
 632                         retv = -ENOBUFS;
 633                         break;
 634                 }
 635                 gsf = kmalloc(optlen,GFP_KERNEL);
 636                 if (!gsf) {
 637                         retv = -ENOBUFS;
 638                         break;
 639                 }
 640                 retv = -EFAULT;
 641                 if (copy_from_user(gsf, optval, optlen)) {
 642                         kfree(gsf);
 643                         break;
 644                 }
 645                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 646                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 647                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 648                         kfree(gsf);
 649                         retv = -ENOBUFS;
 650                         break;
 651                 }
 652                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 653                         kfree(gsf);
 654                         retv = -EINVAL;
 655                         break;
 656                 }
 657                 retv = ip6_mc_msfilter(sk, gsf);
 658                 kfree(gsf);
 659
 660                 break;
 661         }
 662         case IPV6_ROUTER_ALERT:
 663                 if (optlen < sizeof(int))
 664                         goto e_inval;
 665                 retv = ip6_ra_control(sk, val);
 666                 break;
 667         case IPV6_MTU_DISCOVER:
 668                 if (optlen < sizeof(int))
 669                         goto e_inval;
 670                 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
 671                         goto e_inval;
 672                 np->pmtudisc = val;
 673                 retv = 0;
 674                 break;
 675         case IPV6_MTU:
 676                 if (optlen < sizeof(int))
 677                         goto e_inval;
 678                 if (val && val < IPV6_MIN_MTU)
 679                         goto e_inval;
 680                 np->frag_size = val;
 681                 retv = 0;
 682                 break;
 683         case IPV6_RECVERR:
 684                 if (optlen < sizeof(int))
 685                         goto e_inval;
 686                 np->recverr = valbool;
 687                 if (!val)
 688                         skb_queue_purge(&sk->sk_error_queue);
 689                 retv = 0;
 690                 break;
 691         case IPV6_FLOWINFO_SEND:
 692                 if (optlen < sizeof(int))
 693                         goto e_inval;
 694                 np->sndflow = valbool;
 695                 retv = 0;
 696                 break;
 697         case IPV6_FLOWLABEL_MGR:
 698                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 699                 break;
 700         case IPV6_IPSEC_POLICY:
 701         case IPV6_XFRM_POLICY:
 702                 retv = -EPERM;
 703                 if (!capable(CAP_NET_ADMIN))
 704                         break;
 705                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 706                 break;
 707
 708         case IPV6_ADDR_PREFERENCES:
 709             {
 710                 unsigned int pref = 0;
 711                 unsigned int prefmask = ~0;
 712
 713                 if (optlen < sizeof(int))
 714                         goto e_inval;
 715
 716                 retv = -EINVAL;
 717
 718                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 719                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 720                                IPV6_PREFER_SRC_TMP|
 721                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 722                 case IPV6_PREFER_SRC_PUBLIC:
 723                         pref |= IPV6_PREFER_SRC_PUBLIC;
 724                         break;
 725                 case IPV6_PREFER_SRC_TMP:
 726                         pref |= IPV6_PREFER_SRC_TMP;
 727                         break;
 728                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 729                         break;
 730                 case 0:
 731                         goto pref_skip_pubtmp;
 732                 default:
 733                         goto e_inval;
 734                 }
 735
 736                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 737                               IPV6_PREFER_SRC_TMP);
 738 pref_skip_pubtmp:
 739
 740                 /* check HOME/COA conflicts */
 741                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 742                 case IPV6_PREFER_SRC_HOME:
 743                         break;
 744                 case IPV6_PREFER_SRC_COA:
 745                         pref |= IPV6_PREFER_SRC_COA;
 746                 case 0:
 747                         goto pref_skip_coa;
 748                 default:
 749                         goto e_inval;
 750                 }
 751
 752                 prefmask &= ~IPV6_PREFER_SRC_COA;
 753 pref_skip_coa:
 754
 755                 /* check CGA/NONCGA conflicts */
 756                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 757                 case IPV6_PREFER_SRC_CGA:
 758                 case IPV6_PREFER_SRC_NONCGA:
 759                 case 0:
 760                         break;
 761                 default:
 762                         goto e_inval;
 763                 }
 764
 765                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 766                 retv = 0;
 767
 768                 break;
 769             }
 770         }
 771
 772         release_sock(sk);
 773
 774         return retv;
 775
 776 e_inval:
 777         release_sock(sk);
 778         return -EINVAL;
 779 }
 780
 781 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 782                     char __user *optval, unsigned int optlen)
 783 {
 784         int err;
 785
 786         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 787                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 788
 789         if (level != SOL_IPV6)
 790                 return -ENOPROTOOPT;
 791
 792         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 793 #ifdef CONFIG_NETFILTER
 794         /* we need to exclude all possible ENOPROTOOPTs except default case */
 795         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 796                         optname != IPV6_XFRM_POLICY) {
 797                 lock_sock(sk);
 798                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 799                                 optlen);
 800                 release_sock(sk);
 801         }
 802 #endif
 803         return err;
 804 }
 805
 806 EXPORT_SYMBOL(ipv6_setsockopt);
 807
 808 #ifdef CONFIG_COMPAT
 809 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 810                            char __user *optval, unsigned int optlen)
 811 {
 812         int err;
 813
 814         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 815                 if (udp_prot.compat_setsockopt != NULL)
 816                         return udp_prot.compat_setsockopt(sk, level, optname,
 817                                                           optval, optlen);
 818                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 819         }
 820
 821         if (level != SOL_IPV6)
 822                 return -ENOPROTOOPT;
 823
 824         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 825                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 826                         ipv6_setsockopt);
 827
 828         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 829 #ifdef CONFIG_NETFILTER
 830         /* we need to exclude all possible ENOPROTOOPTs except default case */
 831         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 832             optname != IPV6_XFRM_POLICY) {
 833                 lock_sock(sk);
 834                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 835                                            optval, optlen);
 836                 release_sock(sk);
 837         }
 838 #endif
 839         return err;
 840 }
 841
 842 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 843 #endif
 844
 845 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 846                                   int optname, char __user *optval, int len)
 847 {
 848         struct ipv6_opt_hdr *hdr;
 849
 850         if (!opt)
 851                 return 0;
 852
 853         switch(optname) {
 854         case IPV6_HOPOPTS:
 855                 hdr = opt->hopopt;
 856                 break;
 857         case IPV6_RTHDRDSTOPTS:
 858                 hdr = opt->dst0opt;
 859                 break;
 860         case IPV6_RTHDR:
 861                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 862                 break;
 863         case IPV6_DSTOPTS:
 864                 hdr = opt->dst1opt;
 865                 break;
 866         default:
 867                 return -EINVAL; /* should not happen */
 868         }
 869
 870         if (!hdr)
 871                 return 0;
 872
 873         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 874         if (copy_to_user(optval, hdr, len))
 875                 return -EFAULT;
 876         return len;
 877 }
 878
 879 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 880                     char __user *optval, int __user *optlen)
 881 {
 882         struct ipv6_pinfo *np = inet6_sk(sk);
 883         int len;
 884         int val;
 885
 886         if (ip6_mroute_opt(optname))
 887                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 888
 889         if (get_user(len, optlen))
 890                 return -EFAULT;
 891         switch (optname) {
 892         case IPV6_ADDRFORM:
 893                 if (sk->sk_protocol != IPPROTO_UDP &&
 894                     sk->sk_protocol != IPPROTO_UDPLITE &&
 895                     sk->sk_protocol != IPPROTO_TCP)
 896                         return -ENOPROTOOPT;
 897                 if (sk->sk_state != TCP_ESTABLISHED)
 898                         return -ENOTCONN;
 899                 val = sk->sk_family;
 900                 break;
 901         case MCAST_MSFILTER:
 902         {
 903                 struct group_filter gsf;
 904                 int err;
 905
 906                 if (len < GROUP_FILTER_SIZE(0))
 907                         return -EINVAL;
 908                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 909                         return -EFAULT;
 910                 if (gsf.gf_group.ss_family != AF_INET6)
 911                         return -EADDRNOTAVAIL;
 912                 lock_sock(sk);
 913                 err = ip6_mc_msfget(sk, &gsf,
 914                         (struct group_filter __user *)optval, optlen);
 915                 release_sock(sk);
 916                 return err;
 917         }
 918
 919         case IPV6_2292PKTOPTIONS:
 920         {
 921                 struct msghdr msg;
 922                 struct sk_buff *skb;
 923
 924                 if (sk->sk_type != SOCK_STREAM)
 925                         return -ENOPROTOOPT;
 926
 927                 msg.msg_control = optval;
 928                 msg.msg_controllen = len;
 929                 msg.msg_flags = 0;
 930
 931                 lock_sock(sk);
 932                 skb = np->pktoptions;
 933                 if (skb)
 934                         atomic_inc(&skb->users);
 935                 release_sock(sk);
 936
 937                 if (skb) {
 938                         int err = datagram_recv_ctl(sk, &msg, skb);
 939                         kfree_skb(skb);
 940                         if (err)
 941                                 return err;
 942                 } else {
 943                         if (np->rxopt.bits.rxinfo) {
 944                                 struct in6_pktinfo src_info;
 945                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 946                                         np->sticky_pktinfo.ipi6_ifindex;
 947                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 948                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 949                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 950                         }
 951                         if (np->rxopt.bits.rxhlim) {
 952                                 int hlim = np->mcast_hops;
 953                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 954                         }
 955                         if (np->rxopt.bits.rxoinfo) {
 956                                 struct in6_pktinfo src_info;
 957                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 958                                         np->sticky_pktinfo.ipi6_ifindex;
 959                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 960                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 961                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 962                         }
 963                         if (np->rxopt.bits.rxohlim) {
 964                                 int hlim = np->mcast_hops;
 965                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 966                         }
 967                 }
 968                 len -= msg.msg_controllen;
 969                 return put_user(len, optlen);
 970         }
 971         case IPV6_MTU:
 972         {
 973                 struct dst_entry *dst;
 974                 val = 0;
 975                 lock_sock(sk);
 976                 dst = sk_dst_get(sk);
 977                 if (dst) {
 978                         val = dst_mtu(dst);
 979                         dst_release(dst);
 980                 }
 981                 release_sock(sk);
 982                 if (!val)
 983                         return -ENOTCONN;
 984                 break;
 985         }
 986
 987         case IPV6_V6ONLY:
 988                 val = np->ipv6only;
 989                 break;
 990
 991         case IPV6_RECVPKTINFO:
 992                 val = np->rxopt.bits.rxinfo;
 993                 break;
 994
 995         case IPV6_2292PKTINFO:
 996                 val = np->rxopt.bits.rxoinfo;
 997                 break;
 998
 999         case IPV6_RECVHOPLIMIT:
1000                 val = np->rxopt.bits.rxhlim;
1001                 break;
1002
1003         case IPV6_2292HOPLIMIT:
1004                 val = np->rxopt.bits.rxohlim;
1005                 break;
1006
1007         case IPV6_RECVRTHDR:
1008                 val = np->rxopt.bits.srcrt;
1009                 break;
1010
1011         case IPV6_2292RTHDR:
1012                 val = np->rxopt.bits.osrcrt;
1013                 break;
1014
1015         case IPV6_HOPOPTS:
1016         case IPV6_RTHDRDSTOPTS:
1017         case IPV6_RTHDR:
1018         case IPV6_DSTOPTS:
1019         {
1020
1021                 lock_sock(sk);
1022                 len = ipv6_getsockopt_sticky(sk, np->opt,
1023                                              optname, optval, len);
1024                 release_sock(sk);
1025                 /* check if ipv6_getsockopt_sticky() returns err code */
1026                 if (len < 0)
1027                         return len;
1028                 return put_user(len, optlen);
1029         }
1030
1031         case IPV6_RECVHOPOPTS:
1032                 val = np->rxopt.bits.hopopts;
1033                 break;
1034
1035         case IPV6_2292HOPOPTS:
1036                 val = np->rxopt.bits.ohopopts;
1037                 break;
1038
1039         case IPV6_RECVDSTOPTS:
1040                 val = np->rxopt.bits.dstopts;
1041                 break;
1042
1043         case IPV6_2292DSTOPTS:
1044                 val = np->rxopt.bits.odstopts;
1045                 break;
1046
1047         case IPV6_TCLASS:
1048                 val = np->tclass;
1049                 break;
1050
1051         case IPV6_RECVTCLASS:
1052                 val = np->rxopt.bits.rxtclass;
1053                 break;
1054
1055         case IPV6_FLOWINFO:
1056                 val = np->rxopt.bits.rxflow;
1057                 break;
1058
1059         case IPV6_UNICAST_HOPS:
1060         case IPV6_MULTICAST_HOPS:
1061         {
1062                 struct dst_entry *dst;
1063
1064                 if (optname == IPV6_UNICAST_HOPS)
1065                         val = np->hop_limit;
1066                 else
1067                         val = np->mcast_hops;
1068
1069                 dst = sk_dst_get(sk);
1070                 if (dst) {
1071                         if (val < 0)
1072                                 val = ip6_dst_hoplimit(dst);
1073                         dst_release(dst);
1074                 }
1075                 if (val < 0)
1076                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1077                 break;
1078         }
1079
1080         case IPV6_MULTICAST_LOOP:
1081                 val = np->mc_loop;
1082                 break;
1083
1084         case IPV6_MULTICAST_IF:
1085                 val = np->mcast_oif;
1086                 break;
1087
1088         case IPV6_MTU_DISCOVER:
1089                 val = np->pmtudisc;
1090                 break;
1091
1092         case IPV6_RECVERR:
1093                 val = np->recverr;
1094                 break;
1095
1096         case IPV6_FLOWINFO_SEND:
1097                 val = np->sndflow;
1098                 break;
1099
1100         case IPV6_ADDR_PREFERENCES:
1101                 val = 0;
1102
1103                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1104                         val |= IPV6_PREFER_SRC_TMP;
1105                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1106                         val |= IPV6_PREFER_SRC_PUBLIC;
1107                 else {
1108                         /* XXX: should we return system default? */
1109                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1110                 }
1111
1112                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1113                         val |= IPV6_PREFER_SRC_COA;
1114                 else
1115                         val |= IPV6_PREFER_SRC_HOME;
1116                 break;
1117
1118         default:
1119                 return -ENOPROTOOPT;
1120         }
1121         len = min_t(unsigned int, sizeof(int), len);
1122         if(put_user(len, optlen))
1123                 return -EFAULT;
1124         if(copy_to_user(optval,&val,len))
1125                 return -EFAULT;
1126         return 0;
1127 }
1128
1129 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1130                     char __user *optval, int __user *optlen)
1131 {
1132         int err;
1133
1134         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1135                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1136
1137         if(level != SOL_IPV6)
1138                 return -ENOPROTOOPT;
1139
1140         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1141 #ifdef CONFIG_NETFILTER
1142         /* we need to exclude all possible ENOPROTOOPTs except default case */
1143         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1144                 int len;
1145
1146                 if (get_user(len, optlen))
1147                         return -EFAULT;
1148
1149                 lock_sock(sk);
1150                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1151                                 &len);
1152                 release_sock(sk);
1153                 if (err >= 0)
1154                         err = put_user(len, optlen);
1155         }
1156 #endif
1157         return err;
1158 }
1159
1160 EXPORT_SYMBOL(ipv6_getsockopt);
1161
1162 #ifdef CONFIG_COMPAT
1163 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1164                            char __user *optval, int __user *optlen)
1165 {
1166         int err;
1167
1168         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1169                 if (udp_prot.compat_getsockopt != NULL)
1170                         return udp_prot.compat_getsockopt(sk, level, optname,
1171                                                           optval, optlen);
1172                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1173         }
1174
1175         if (level != SOL_IPV6)
1176                 return -ENOPROTOOPT;
1177
1178         if (optname == MCAST_MSFILTER)
1179                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1180                         ipv6_getsockopt);
1181
1182         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1183 #ifdef CONFIG_NETFILTER
1184         /* we need to exclude all possible ENOPROTOOPTs except default case */
1185         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1186                 int len;
1187
1188                 if (get_user(len, optlen))
1189                         return -EFAULT;
1190
1191                 lock_sock(sk);
1192                 err = compat_nf_getsockopt(sk, PF_INET6,
1193                                            optname, optval, &len);
1194                 release_sock(sk);
1195                 if (err >= 0)
1196                         err = put_user(len, optlen);
1197         }
1198 #endif
1199         return err;
1200 }
1201
1202 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1203 #endif
1204