git.oblomov.eu Git - 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, void (*destructor)(struct sock *))
  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 -EINVAL;
  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                         if (ra->destructor)
  85                                 ra->destructor(sk);
  86                         sock_put(sk);
  87                         kfree(ra);
  88                         return 0;
  89                 }
  90         }
  91         if (new_ra == NULL) {
  92                 write_unlock_bh(&ip6_ra_lock);
  93                 return -ENOBUFS;
  94         }
  95         new_ra->sk = sk;
  96         new_ra->sel = sel;
  97         new_ra->destructor = destructor;
  98         new_ra->next = ra;
  99         *rap = new_ra;
 100         sock_hold(sk);
 101         write_unlock_bh(&ip6_ra_lock);
 102         return 0;
 103 }
 104
 105 static
 106 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 107                                            struct ipv6_txoptions *opt)
 108 {
 109         if (inet_sk(sk)->is_icsk) {
 110                 if (opt &&
 111                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 112                     inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 113                         struct inet_connection_sock *icsk = inet_csk(sk);
 114                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 115                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 116                 }
 117                 opt = xchg(&inet6_sk(sk)->opt, opt);
 118         } else {
 119                 write_lock(&sk->sk_dst_lock);
 120                 opt = xchg(&inet6_sk(sk)->opt, opt);
 121                 write_unlock(&sk->sk_dst_lock);
 122         }
 123         sk_dst_reset(sk);
 124
 125         return opt;
 126 }
 127
 128 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 129                     char __user *optval, int optlen)
 130 {
 131         struct ipv6_pinfo *np = inet6_sk(sk);
 132         struct net *net = sock_net(sk);
 133         int val, valbool;
 134         int retv = -ENOPROTOOPT;
 135
 136         if (optval == NULL)
 137                 val=0;
 138         else {
 139                 if (optlen >= sizeof(int)) {
 140                         if (get_user(val, (int __user *) optval))
 141                                 return -EFAULT;
 142                 } else
 143                         val = 0;
 144         }
 145
 146         valbool = (val!=0);
 147
 148         if (ip6_mroute_opt(optname))
 149                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 150
 151         lock_sock(sk);
 152
 153         switch (optname) {
 154
 155         case IPV6_ADDRFORM:
 156                 if (optlen < sizeof(int))
 157                         goto e_inval;
 158                 if (val == PF_INET) {
 159                         struct ipv6_txoptions *opt;
 160                         struct sk_buff *pktopt;
 161
 162                         if (sk->sk_type == SOCK_RAW)
 163                                 break;
 164
 165                         if (sk->sk_protocol == IPPROTO_UDP ||
 166                             sk->sk_protocol == IPPROTO_UDPLITE) {
 167                                 struct udp_sock *up = udp_sk(sk);
 168                                 if (up->pending == AF_INET6) {
 169                                         retv = -EBUSY;
 170                                         break;
 171                                 }
 172                         } else if (sk->sk_protocol != IPPROTO_TCP)
 173                                 break;
 174
 175                         if (sk->sk_state != TCP_ESTABLISHED) {
 176                                 retv = -ENOTCONN;
 177                                 break;
 178                         }
 179
 180                         if (ipv6_only_sock(sk) ||
 181                             !ipv6_addr_v4mapped(&np->daddr)) {
 182                                 retv = -EADDRNOTAVAIL;
 183                                 break;
 184                         }
 185
 186                         fl6_free_socklist(sk);
 187                         ipv6_sock_mc_close(sk);
 188
 189                         /*
 190                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 191                          * remove it from the refcnt debug socks count in the
 192                          * original family...
 193                          */
 194                         sk_refcnt_debug_dec(sk);
 195
 196                         if (sk->sk_protocol == IPPROTO_TCP) {
 197                                 struct inet_connection_sock *icsk = inet_csk(sk);
 198                                 local_bh_disable();
 199                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 200                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 201                                 local_bh_enable();
 202                                 sk->sk_prot = &tcp_prot;
 203                                 icsk->icsk_af_ops = &ipv4_specific;
 204                                 sk->sk_socket->ops = &inet_stream_ops;
 205                                 sk->sk_family = PF_INET;
 206                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 207                         } else {
 208                                 struct proto *prot = &udp_prot;
 209
 210                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 211                                         prot = &udplite_prot;
 212                                 local_bh_disable();
 213                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 214                                 sock_prot_inuse_add(net, prot, 1);
 215                                 local_bh_enable();
 216                                 sk->sk_prot = prot;
 217                                 sk->sk_socket->ops = &inet_dgram_ops;
 218                                 sk->sk_family = PF_INET;
 219                         }
 220                         opt = xchg(&np->opt, NULL);
 221                         if (opt)
 222                                 sock_kfree_s(sk, opt, opt->tot_len);
 223                         pktopt = xchg(&np->pktoptions, NULL);
 224                         if (pktopt)
 225                                 kfree_skb(pktopt);
 226
 227                         sk->sk_destruct = inet_sock_destruct;
 228                         /*
 229                          * ... and add it to the refcnt debug socks count
 230                          * in the new family. -acme
 231                          */
 232                         sk_refcnt_debug_inc(sk);
 233                         module_put(THIS_MODULE);
 234                         retv = 0;
 235                         break;
 236                 }
 237                 goto e_inval;
 238
 239         case IPV6_V6ONLY:
 240                 if (optlen < sizeof(int) ||
 241                     inet_sk(sk)->num)
 242                         goto e_inval;
 243                 np->ipv6only = valbool;
 244                 retv = 0;
 245                 break;
 246
 247         case IPV6_RECVPKTINFO:
 248                 if (optlen < sizeof(int))
 249                         goto e_inval;
 250                 np->rxopt.bits.rxinfo = valbool;
 251                 retv = 0;
 252                 break;
 253
 254         case IPV6_2292PKTINFO:
 255                 if (optlen < sizeof(int))
 256                         goto e_inval;
 257                 np->rxopt.bits.rxoinfo = valbool;
 258                 retv = 0;
 259                 break;
 260
 261         case IPV6_RECVHOPLIMIT:
 262                 if (optlen < sizeof(int))
 263                         goto e_inval;
 264                 np->rxopt.bits.rxhlim = valbool;
 265                 retv = 0;
 266                 break;
 267
 268         case IPV6_2292HOPLIMIT:
 269                 if (optlen < sizeof(int))
 270                         goto e_inval;
 271                 np->rxopt.bits.rxohlim = valbool;
 272                 retv = 0;
 273                 break;
 274
 275         case IPV6_RECVRTHDR:
 276                 if (optlen < sizeof(int))
 277                         goto e_inval;
 278                 np->rxopt.bits.srcrt = valbool;
 279                 retv = 0;
 280                 break;
 281
 282         case IPV6_2292RTHDR:
 283                 if (optlen < sizeof(int))
 284                         goto e_inval;
 285                 np->rxopt.bits.osrcrt = valbool;
 286                 retv = 0;
 287                 break;
 288
 289         case IPV6_RECVHOPOPTS:
 290                 if (optlen < sizeof(int))
 291                         goto e_inval;
 292                 np->rxopt.bits.hopopts = valbool;
 293                 retv = 0;
 294                 break;
 295
 296         case IPV6_2292HOPOPTS:
 297                 if (optlen < sizeof(int))
 298                         goto e_inval;
 299                 np->rxopt.bits.ohopopts = valbool;
 300                 retv = 0;
 301                 break;
 302
 303         case IPV6_RECVDSTOPTS:
 304                 if (optlen < sizeof(int))
 305                         goto e_inval;
 306                 np->rxopt.bits.dstopts = valbool;
 307                 retv = 0;
 308                 break;
 309
 310         case IPV6_2292DSTOPTS:
 311                 if (optlen < sizeof(int))
 312                         goto e_inval;
 313                 np->rxopt.bits.odstopts = valbool;
 314                 retv = 0;
 315                 break;
 316
 317         case IPV6_TCLASS:
 318                 if (optlen < sizeof(int))
 319                         goto e_inval;
 320                 if (val < -1 || val > 0xff)
 321                         goto e_inval;
 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                 if (optlen == 0)
 347                         optval = NULL;
 348
 349                 /* hop-by-hop / destination options are privileged option */
 350                 retv = -EPERM;
 351                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 352                         break;
 353
 354                 if (optlen < sizeof(struct ipv6_opt_hdr) ||
 355                     optlen & 0x7 || optlen > 8 * 255)
 356                         goto e_inval;
 357
 358                 opt = ipv6_renew_options(sk, np->opt, optname,
 359                                          (struct ipv6_opt_hdr __user *)optval,
 360                                          optlen);
 361                 if (IS_ERR(opt)) {
 362                         retv = PTR_ERR(opt);
 363                         break;
 364                 }
 365
 366                 /* routing header option needs extra check */
 367                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 368                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 369                         switch (rthdr->type) {
 370 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 371                         case IPV6_SRCRT_TYPE_2:
 372                                 break;
 373 #endif
 374                         default:
 375                                 goto sticky_done;
 376                         }
 377
 378                         if ((rthdr->hdrlen & 1) ||
 379                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 380                                 goto sticky_done;
 381                 }
 382
 383                 retv = 0;
 384                 opt = ipv6_update_options(sk, opt);
 385 sticky_done:
 386                 if (opt)
 387                         sock_kfree_s(sk, opt, opt->tot_len);
 388                 break;
 389         }
 390
 391         case IPV6_2292PKTOPTIONS:
 392         {
 393                 struct ipv6_txoptions *opt = NULL;
 394                 struct msghdr msg;
 395                 struct flowi fl;
 396                 int junk;
 397
 398                 fl.fl6_flowlabel = 0;
 399                 fl.oif = sk->sk_bound_dev_if;
 400
 401                 if (optlen == 0)
 402                         goto update;
 403
 404                 /* 1K is probably excessive
 405                  * 1K is surely not enough, 2K per standard header is 16K.
 406                  */
 407                 retv = -EINVAL;
 408                 if (optlen > 64*1024)
 409                         break;
 410
 411                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 412                 retv = -ENOBUFS;
 413                 if (opt == NULL)
 414                         break;
 415
 416                 memset(opt, 0, sizeof(*opt));
 417                 opt->tot_len = sizeof(*opt) + optlen;
 418                 retv = -EFAULT;
 419                 if (copy_from_user(opt+1, optval, optlen))
 420                         goto done;
 421
 422                 msg.msg_controllen = optlen;
 423                 msg.msg_control = (void*)(opt+1);
 424
 425                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
 426                 if (retv)
 427                         goto done;
 428 update:
 429                 retv = 0;
 430                 opt = ipv6_update_options(sk, opt);
 431 done:
 432                 if (opt)
 433                         sock_kfree_s(sk, opt, opt->tot_len);
 434                 break;
 435         }
 436         case IPV6_UNICAST_HOPS:
 437                 if (optlen < sizeof(int))
 438                         goto e_inval;
 439                 if (val > 255 || val < -1)
 440                         goto e_inval;
 441                 np->hop_limit = val;
 442                 retv = 0;
 443                 break;
 444
 445         case IPV6_MULTICAST_HOPS:
 446                 if (sk->sk_type == SOCK_STREAM)
 447                         goto e_inval;
 448                 if (optlen < sizeof(int))
 449                         goto e_inval;
 450                 if (val > 255 || val < -1)
 451                         goto e_inval;
 452                 np->mcast_hops = val;
 453                 retv = 0;
 454                 break;
 455
 456         case IPV6_MULTICAST_LOOP:
 457                 if (optlen < sizeof(int))
 458                         goto e_inval;
 459                 np->mc_loop = valbool;
 460                 retv = 0;
 461                 break;
 462
 463         case IPV6_MULTICAST_IF:
 464                 if (sk->sk_type == SOCK_STREAM)
 465                         goto e_inval;
 466                 if (optlen < sizeof(int))
 467                         goto e_inval;
 468
 469                 if (val) {
 470                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 471                                 goto e_inval;
 472
 473                         if (__dev_get_by_index(net, val) == NULL) {
 474                                 retv = -ENODEV;
 475                                 break;
 476                         }
 477                 }
 478                 np->mcast_oif = val;
 479                 retv = 0;
 480                 break;
 481         case IPV6_ADD_MEMBERSHIP:
 482         case IPV6_DROP_MEMBERSHIP:
 483         {
 484                 struct ipv6_mreq mreq;
 485
 486                 if (optlen < sizeof(struct ipv6_mreq))
 487                         goto e_inval;
 488
 489                 retv = -EPROTO;
 490                 if (inet_sk(sk)->is_icsk)
 491                         break;
 492
 493                 retv = -EFAULT;
 494                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 495                         break;
 496
 497                 if (optname == IPV6_ADD_MEMBERSHIP)
 498                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 499                 else
 500                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 501                 break;
 502         }
 503         case IPV6_JOIN_ANYCAST:
 504         case IPV6_LEAVE_ANYCAST:
 505         {
 506                 struct ipv6_mreq mreq;
 507
 508                 if (optlen < sizeof(struct ipv6_mreq))
 509                         goto e_inval;
 510
 511                 retv = -EFAULT;
 512                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 513                         break;
 514
 515                 if (optname == IPV6_JOIN_ANYCAST)
 516                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 517                 else
 518                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 519                 break;
 520         }
 521         case MCAST_JOIN_GROUP:
 522         case MCAST_LEAVE_GROUP:
 523         {
 524                 struct group_req greq;
 525                 struct sockaddr_in6 *psin6;
 526
 527                 if (optlen < sizeof(struct group_req))
 528                         goto e_inval;
 529
 530                 retv = -EFAULT;
 531                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 532                         break;
 533                 if (greq.gr_group.ss_family != AF_INET6) {
 534                         retv = -EADDRNOTAVAIL;
 535                         break;
 536                 }
 537                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 538                 if (optname == MCAST_JOIN_GROUP)
 539                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 540                                 &psin6->sin6_addr);
 541                 else
 542                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 543                                 &psin6->sin6_addr);
 544                 break;
 545         }
 546         case MCAST_JOIN_SOURCE_GROUP:
 547         case MCAST_LEAVE_SOURCE_GROUP:
 548         case MCAST_BLOCK_SOURCE:
 549         case MCAST_UNBLOCK_SOURCE:
 550         {
 551                 struct group_source_req greqs;
 552                 int omode, add;
 553
 554                 if (optlen < sizeof(struct group_source_req))
 555                         goto e_inval;
 556                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 557                         retv = -EFAULT;
 558                         break;
 559                 }
 560                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 561                     greqs.gsr_source.ss_family != AF_INET6) {
 562                         retv = -EADDRNOTAVAIL;
 563                         break;
 564                 }
 565                 if (optname == MCAST_BLOCK_SOURCE) {
 566                         omode = MCAST_EXCLUDE;
 567                         add = 1;
 568                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 569                         omode = MCAST_EXCLUDE;
 570                         add = 0;
 571                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 572                         struct sockaddr_in6 *psin6;
 573
 574                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 575                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 576                                 &psin6->sin6_addr);
 577                         /* prior join w/ different source is ok */
 578                         if (retv && retv != -EADDRINUSE)
 579                                 break;
 580                         omode = MCAST_INCLUDE;
 581                         add = 1;
 582                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 583                         omode = MCAST_INCLUDE;
 584                         add = 0;
 585                 }
 586                 retv = ip6_mc_source(add, omode, sk, &greqs);
 587                 break;
 588         }
 589         case MCAST_MSFILTER:
 590         {
 591                 extern int sysctl_mld_max_msf;
 592                 struct group_filter *gsf;
 593
 594                 if (optlen < GROUP_FILTER_SIZE(0))
 595                         goto e_inval;
 596                 if (optlen > sysctl_optmem_max) {
 597                         retv = -ENOBUFS;
 598                         break;
 599                 }
 600                 gsf = kmalloc(optlen,GFP_KERNEL);
 601                 if (!gsf) {
 602                         retv = -ENOBUFS;
 603                         break;
 604                 }
 605                 retv = -EFAULT;
 606                 if (copy_from_user(gsf, optval, optlen)) {
 607                         kfree(gsf);
 608                         break;
 609                 }
 610                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 611                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 612                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 613                         kfree(gsf);
 614                         retv = -ENOBUFS;
 615                         break;
 616                 }
 617                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 618                         kfree(gsf);
 619                         retv = -EINVAL;
 620                         break;
 621                 }
 622                 retv = ip6_mc_msfilter(sk, gsf);
 623                 kfree(gsf);
 624
 625                 break;
 626         }
 627         case IPV6_ROUTER_ALERT:
 628                 if (optlen < sizeof(int))
 629                         goto e_inval;
 630                 retv = ip6_ra_control(sk, val, NULL);
 631                 break;
 632         case IPV6_MTU_DISCOVER:
 633                 if (optlen < sizeof(int))
 634                         goto e_inval;
 635                 if (val<0 || val>3)
 636                         goto e_inval;
 637                 np->pmtudisc = val;
 638                 retv = 0;
 639                 break;
 640         case IPV6_MTU:
 641                 if (optlen < sizeof(int))
 642                         goto e_inval;
 643                 if (val && val < IPV6_MIN_MTU)
 644                         goto e_inval;
 645                 np->frag_size = val;
 646                 retv = 0;
 647                 break;
 648         case IPV6_RECVERR:
 649                 if (optlen < sizeof(int))
 650                         goto e_inval;
 651                 np->recverr = valbool;
 652                 if (!val)
 653                         skb_queue_purge(&sk->sk_error_queue);
 654                 retv = 0;
 655                 break;
 656         case IPV6_FLOWINFO_SEND:
 657                 if (optlen < sizeof(int))
 658                         goto e_inval;
 659                 np->sndflow = valbool;
 660                 retv = 0;
 661                 break;
 662         case IPV6_FLOWLABEL_MGR:
 663                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 664                 break;
 665         case IPV6_IPSEC_POLICY:
 666         case IPV6_XFRM_POLICY:
 667                 retv = -EPERM;
 668                 if (!capable(CAP_NET_ADMIN))
 669                         break;
 670                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 671                 break;
 672
 673         case IPV6_ADDR_PREFERENCES:
 674             {
 675                 unsigned int pref = 0;
 676                 unsigned int prefmask = ~0;
 677
 678                 if (optlen < sizeof(int))
 679                         goto e_inval;
 680
 681                 retv = -EINVAL;
 682
 683                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 684                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 685                                IPV6_PREFER_SRC_TMP|
 686                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 687                 case IPV6_PREFER_SRC_PUBLIC:
 688                         pref |= IPV6_PREFER_SRC_PUBLIC;
 689                         break;
 690                 case IPV6_PREFER_SRC_TMP:
 691                         pref |= IPV6_PREFER_SRC_TMP;
 692                         break;
 693                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 694                         break;
 695                 case 0:
 696                         goto pref_skip_pubtmp;
 697                 default:
 698                         goto e_inval;
 699                 }
 700
 701                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 702                               IPV6_PREFER_SRC_TMP);
 703 pref_skip_pubtmp:
 704
 705                 /* check HOME/COA conflicts */
 706                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 707                 case IPV6_PREFER_SRC_HOME:
 708                         break;
 709                 case IPV6_PREFER_SRC_COA:
 710                         pref |= IPV6_PREFER_SRC_COA;
 711                 case 0:
 712                         goto pref_skip_coa;
 713                 default:
 714                         goto e_inval;
 715                 }
 716
 717                 prefmask &= ~IPV6_PREFER_SRC_COA;
 718 pref_skip_coa:
 719
 720                 /* check CGA/NONCGA conflicts */
 721                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 722                 case IPV6_PREFER_SRC_CGA:
 723                 case IPV6_PREFER_SRC_NONCGA:
 724                 case 0:
 725                         break;
 726                 default:
 727                         goto e_inval;
 728                 }
 729
 730                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 731                 retv = 0;
 732
 733                 break;
 734             }
 735         }
 736
 737         release_sock(sk);
 738
 739         return retv;
 740
 741 e_inval:
 742         release_sock(sk);
 743         return -EINVAL;
 744 }
 745
 746 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 747                     char __user *optval, int optlen)
 748 {
 749         int err;
 750
 751         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 752                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 753
 754         if (level != SOL_IPV6)
 755                 return -ENOPROTOOPT;
 756
 757         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 758 #ifdef CONFIG_NETFILTER
 759         /* we need to exclude all possible ENOPROTOOPTs except default case */
 760         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 761                         optname != IPV6_XFRM_POLICY) {
 762                 lock_sock(sk);
 763                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 764                                 optlen);
 765                 release_sock(sk);
 766         }
 767 #endif
 768         return err;
 769 }
 770
 771 EXPORT_SYMBOL(ipv6_setsockopt);
 772
 773 #ifdef CONFIG_COMPAT
 774 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 775                            char __user *optval, int optlen)
 776 {
 777         int err;
 778
 779         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 780                 if (udp_prot.compat_setsockopt != NULL)
 781                         return udp_prot.compat_setsockopt(sk, level, optname,
 782                                                           optval, optlen);
 783                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 784         }
 785
 786         if (level != SOL_IPV6)
 787                 return -ENOPROTOOPT;
 788
 789         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 790                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 791                         ipv6_setsockopt);
 792
 793         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 794 #ifdef CONFIG_NETFILTER
 795         /* we need to exclude all possible ENOPROTOOPTs except default case */
 796         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 797             optname != IPV6_XFRM_POLICY) {
 798                 lock_sock(sk);
 799                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 800                                            optval, optlen);
 801                 release_sock(sk);
 802         }
 803 #endif
 804         return err;
 805 }
 806
 807 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 808 #endif
 809
 810 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 811                                   int optname, char __user *optval, int len)
 812 {
 813         struct ipv6_opt_hdr *hdr;
 814
 815         if (!opt)
 816                 return 0;
 817
 818         switch(optname) {
 819         case IPV6_HOPOPTS:
 820                 hdr = opt->hopopt;
 821                 break;
 822         case IPV6_RTHDRDSTOPTS:
 823                 hdr = opt->dst0opt;
 824                 break;
 825         case IPV6_RTHDR:
 826                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 827                 break;
 828         case IPV6_DSTOPTS:
 829                 hdr = opt->dst1opt;
 830                 break;
 831         default:
 832                 return -EINVAL; /* should not happen */
 833         }
 834
 835         if (!hdr)
 836                 return 0;
 837
 838         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 839         if (copy_to_user(optval, hdr, len))
 840                 return -EFAULT;
 841         return len;
 842 }
 843
 844 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 845                     char __user *optval, int __user *optlen)
 846 {
 847         struct ipv6_pinfo *np = inet6_sk(sk);
 848         int len;
 849         int val;
 850
 851         if (ip6_mroute_opt(optname))
 852                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 853
 854         if (get_user(len, optlen))
 855                 return -EFAULT;
 856         switch (optname) {
 857         case IPV6_ADDRFORM:
 858                 if (sk->sk_protocol != IPPROTO_UDP &&
 859                     sk->sk_protocol != IPPROTO_UDPLITE &&
 860                     sk->sk_protocol != IPPROTO_TCP)
 861                         return -EINVAL;
 862                 if (sk->sk_state != TCP_ESTABLISHED)
 863                         return -ENOTCONN;
 864                 val = sk->sk_family;
 865                 break;
 866         case MCAST_MSFILTER:
 867         {
 868                 struct group_filter gsf;
 869                 int err;
 870
 871                 if (len < GROUP_FILTER_SIZE(0))
 872                         return -EINVAL;
 873                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 874                         return -EFAULT;
 875                 lock_sock(sk);
 876                 err = ip6_mc_msfget(sk, &gsf,
 877                         (struct group_filter __user *)optval, optlen);
 878                 release_sock(sk);
 879                 return err;
 880         }
 881
 882         case IPV6_2292PKTOPTIONS:
 883         {
 884                 struct msghdr msg;
 885                 struct sk_buff *skb;
 886
 887                 if (sk->sk_type != SOCK_STREAM)
 888                         return -ENOPROTOOPT;
 889
 890                 msg.msg_control = optval;
 891                 msg.msg_controllen = len;
 892                 msg.msg_flags = 0;
 893
 894                 lock_sock(sk);
 895                 skb = np->pktoptions;
 896                 if (skb)
 897                         atomic_inc(&skb->users);
 898                 release_sock(sk);
 899
 900                 if (skb) {
 901                         int err = datagram_recv_ctl(sk, &msg, skb);
 902                         kfree_skb(skb);
 903                         if (err)
 904                                 return err;
 905                 } else {
 906                         if (np->rxopt.bits.rxinfo) {
 907                                 struct in6_pktinfo src_info;
 908                                 src_info.ipi6_ifindex = np->mcast_oif;
 909                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 910                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 911                         }
 912                         if (np->rxopt.bits.rxhlim) {
 913                                 int hlim = np->mcast_hops;
 914                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 915                         }
 916                         if (np->rxopt.bits.rxoinfo) {
 917                                 struct in6_pktinfo src_info;
 918                                 src_info.ipi6_ifindex = np->mcast_oif;
 919                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 920                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 921                         }
 922                         if (np->rxopt.bits.rxohlim) {
 923                                 int hlim = np->mcast_hops;
 924                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 925                         }
 926                 }
 927                 len -= msg.msg_controllen;
 928                 return put_user(len, optlen);
 929         }
 930         case IPV6_MTU:
 931         {
 932                 struct dst_entry *dst;
 933                 val = 0;
 934                 lock_sock(sk);
 935                 dst = sk_dst_get(sk);
 936                 if (dst) {
 937                         val = dst_mtu(dst);
 938                         dst_release(dst);
 939                 }
 940                 release_sock(sk);
 941                 if (!val)
 942                         return -ENOTCONN;
 943                 break;
 944         }
 945
 946         case IPV6_V6ONLY:
 947                 val = np->ipv6only;
 948                 break;
 949
 950         case IPV6_RECVPKTINFO:
 951                 val = np->rxopt.bits.rxinfo;
 952                 break;
 953
 954         case IPV6_2292PKTINFO:
 955                 val = np->rxopt.bits.rxoinfo;
 956                 break;
 957
 958         case IPV6_RECVHOPLIMIT:
 959                 val = np->rxopt.bits.rxhlim;
 960                 break;
 961
 962         case IPV6_2292HOPLIMIT:
 963                 val = np->rxopt.bits.rxohlim;
 964                 break;
 965
 966         case IPV6_RECVRTHDR:
 967                 val = np->rxopt.bits.srcrt;
 968                 break;
 969
 970         case IPV6_2292RTHDR:
 971                 val = np->rxopt.bits.osrcrt;
 972                 break;
 973
 974         case IPV6_HOPOPTS:
 975         case IPV6_RTHDRDSTOPTS:
 976         case IPV6_RTHDR:
 977         case IPV6_DSTOPTS:
 978         {
 979
 980                 lock_sock(sk);
 981                 len = ipv6_getsockopt_sticky(sk, np->opt,
 982                                              optname, optval, len);
 983                 release_sock(sk);
 984                 /* check if ipv6_getsockopt_sticky() returns err code */
 985                 if (len < 0)
 986                         return len;
 987                 return put_user(len, optlen);
 988         }
 989
 990         case IPV6_RECVHOPOPTS:
 991                 val = np->rxopt.bits.hopopts;
 992                 break;
 993
 994         case IPV6_2292HOPOPTS:
 995                 val = np->rxopt.bits.ohopopts;
 996                 break;
 997
 998         case IPV6_RECVDSTOPTS:
 999                 val = np->rxopt.bits.dstopts;
1000                 break;
1001
1002         case IPV6_2292DSTOPTS:
1003                 val = np->rxopt.bits.odstopts;
1004                 break;
1005
1006         case IPV6_TCLASS:
1007                 val = np->tclass;
1008                 if (val < 0)
1009                         val = 0;
1010                 break;
1011
1012         case IPV6_RECVTCLASS:
1013                 val = np->rxopt.bits.rxtclass;
1014                 break;
1015
1016         case IPV6_FLOWINFO:
1017                 val = np->rxopt.bits.rxflow;
1018                 break;
1019
1020         case IPV6_UNICAST_HOPS:
1021         case IPV6_MULTICAST_HOPS:
1022         {
1023                 struct dst_entry *dst;
1024
1025                 if (optname == IPV6_UNICAST_HOPS)
1026                         val = np->hop_limit;
1027                 else
1028                         val = np->mcast_hops;
1029
1030                 dst = sk_dst_get(sk);
1031                 if (dst) {
1032                         if (val < 0)
1033                                 val = ip6_dst_hoplimit(dst);
1034                         dst_release(dst);
1035                 }
1036                 if (val < 0)
1037                         val = ipv6_devconf.hop_limit;
1038                 break;
1039         }
1040
1041         case IPV6_MULTICAST_LOOP:
1042                 val = np->mc_loop;
1043                 break;
1044
1045         case IPV6_MULTICAST_IF:
1046                 val = np->mcast_oif;
1047                 break;
1048
1049         case IPV6_MTU_DISCOVER:
1050                 val = np->pmtudisc;
1051                 break;
1052
1053         case IPV6_RECVERR:
1054                 val = np->recverr;
1055                 break;
1056
1057         case IPV6_FLOWINFO_SEND:
1058                 val = np->sndflow;
1059                 break;
1060
1061         case IPV6_ADDR_PREFERENCES:
1062                 val = 0;
1063
1064                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1065                         val |= IPV6_PREFER_SRC_TMP;
1066                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1067                         val |= IPV6_PREFER_SRC_PUBLIC;
1068                 else {
1069                         /* XXX: should we return system default? */
1070                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1071                 }
1072
1073                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1074                         val |= IPV6_PREFER_SRC_COA;
1075                 else
1076                         val |= IPV6_PREFER_SRC_HOME;
1077                 break;
1078
1079         default:
1080                 return -ENOPROTOOPT;
1081         }
1082         len = min_t(unsigned int, sizeof(int), len);
1083         if(put_user(len, optlen))
1084                 return -EFAULT;
1085         if(copy_to_user(optval,&val,len))
1086                 return -EFAULT;
1087         return 0;
1088 }
1089
1090 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1091                     char __user *optval, int __user *optlen)
1092 {
1093         int err;
1094
1095         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1096                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1097
1098         if(level != SOL_IPV6)
1099                 return -ENOPROTOOPT;
1100
1101         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1102 #ifdef CONFIG_NETFILTER
1103         /* we need to exclude all possible ENOPROTOOPTs except default case */
1104         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1105                 int len;
1106
1107                 if (get_user(len, optlen))
1108                         return -EFAULT;
1109
1110                 lock_sock(sk);
1111                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1112                                 &len);
1113                 release_sock(sk);
1114                 if (err >= 0)
1115                         err = put_user(len, optlen);
1116         }
1117 #endif
1118         return err;
1119 }
1120
1121 EXPORT_SYMBOL(ipv6_getsockopt);
1122
1123 #ifdef CONFIG_COMPAT
1124 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1125                            char __user *optval, int __user *optlen)
1126 {
1127         int err;
1128
1129         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1130                 if (udp_prot.compat_getsockopt != NULL)
1131                         return udp_prot.compat_getsockopt(sk, level, optname,
1132                                                           optval, optlen);
1133                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1134         }
1135
1136         if (level != SOL_IPV6)
1137                 return -ENOPROTOOPT;
1138
1139         if (optname == MCAST_MSFILTER)
1140                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1141                         ipv6_getsockopt);
1142
1143         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1144 #ifdef CONFIG_NETFILTER
1145         /* we need to exclude all possible ENOPROTOOPTs except default case */
1146         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1147                 int len;
1148
1149                 if (get_user(len, optlen))
1150                         return -EFAULT;
1151
1152                 lock_sock(sk);
1153                 err = compat_nf_getsockopt(sk, PF_INET6,
1154                                            optname, optval, &len);
1155                 release_sock(sk);
1156                 if (err >= 0)
1157                         err = put_user(len, optlen);
1158         }
1159 #endif
1160         return err;
1161 }
1162
1163 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1164 #endif
1165