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