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  *      $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  *      FIXME: Make the setsockopt code POSIX compliant: That is
  18  *
  19  *      o       Truncate getsockopt returns
  20  *      o       Return an optlen of the truncated length if need be
  21  *
  22  *      Changes:
  23  *      David L Stevens <dlstevens@us.ibm.com>:
  24  *              - added multicast source filtering API for MLDv2
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/capability.h>
  29 #include <linux/errno.h>
  30 #include <linux/types.h>
  31 #include <linux/socket.h>
  32 #include <linux/sockios.h>
  33 #include <linux/net.h>
  34 #include <linux/in6.h>
  35 #include <linux/mroute6.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/if_arp.h>
  38 #include <linux/init.h>
  39 #include <linux/sysctl.h>
  40 #include <linux/netfilter.h>
  41
  42 #include <net/sock.h>
  43 #include <net/snmp.h>
  44 #include <net/ipv6.h>
  45 #include <net/ndisc.h>
  46 #include <net/protocol.h>
  47 #include <net/transp_v6.h>
  48 #include <net/ip6_route.h>
  49 #include <net/addrconf.h>
  50 #include <net/inet_common.h>
  51 #include <net/tcp.h>
  52 #include <net/udp.h>
  53 #include <net/udplite.h>
  54 #include <net/xfrm.h>
  55 #include <net/compat.h>
  56
  57 #include <asm/uaccess.h>
  58
  59 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  60
  61 struct ip6_ra_chain *ip6_ra_chain;
  62 DEFINE_RWLOCK(ip6_ra_lock);
  63
  64 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
  65 {
  66         struct ip6_ra_chain *ra, *new_ra, **rap;
  67
  68         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  69         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
  70                 return -EINVAL;
  71
  72         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  73
  74         write_lock_bh(&ip6_ra_lock);
  75         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  76                 if (ra->sk == sk) {
  77                         if (sel>=0) {
  78                                 write_unlock_bh(&ip6_ra_lock);
  79                                 kfree(new_ra);
  80                                 return -EADDRINUSE;
  81                         }
  82
  83                         *rap = ra->next;
  84                         write_unlock_bh(&ip6_ra_lock);
  85
  86                         if (ra->destructor)
  87                                 ra->destructor(sk);
  88                         sock_put(sk);
  89                         kfree(ra);
  90                         return 0;
  91                 }
  92         }
  93         if (new_ra == NULL) {
  94                 write_unlock_bh(&ip6_ra_lock);
  95                 return -ENOBUFS;
  96         }
  97         new_ra->sk = sk;
  98         new_ra->sel = sel;
  99         new_ra->destructor = destructor;
 100         new_ra->next = ra;
 101         *rap = new_ra;
 102         sock_hold(sk);
 103         write_unlock_bh(&ip6_ra_lock);
 104         return 0;
 105 }
 106
 107 static
 108 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 109                                            struct ipv6_txoptions *opt)
 110 {
 111         if (inet_sk(sk)->is_icsk) {
 112                 if (opt &&
 113                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 114                     inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 115                         struct inet_connection_sock *icsk = inet_csk(sk);
 116                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 117                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 118                 }
 119                 opt = xchg(&inet6_sk(sk)->opt, opt);
 120         } else {
 121                 write_lock(&sk->sk_dst_lock);
 122                 opt = xchg(&inet6_sk(sk)->opt, opt);
 123                 write_unlock(&sk->sk_dst_lock);
 124         }
 125         sk_dst_reset(sk);
 126
 127         return opt;
 128 }
 129
 130 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 131                     char __user *optval, int optlen)
 132 {
 133         struct ipv6_pinfo *np = inet6_sk(sk);
 134         struct net *net = sock_net(sk);
 135         int val, valbool;
 136         int retv = -ENOPROTOOPT;
 137
 138         if (optval == NULL)
 139                 val=0;
 140         else {
 141                 if (optlen >= sizeof(int)) {
 142                         if (get_user(val, (int __user *) optval))
 143                                 return -EFAULT;
 144                 } else
 145                         val = 0;
 146         }
 147
 148         valbool = (val!=0);
 149
 150         if (ip6_mroute_opt(optname))
 151                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 152
 153         lock_sock(sk);
 154
 155         switch (optname) {
 156
 157         case IPV6_ADDRFORM:
 158                 if (optlen < sizeof(int))
 159                         goto e_inval;
 160                 if (val == PF_INET) {
 161                         struct ipv6_txoptions *opt;
 162                         struct sk_buff *pktopt;
 163
 164                         if (sk->sk_protocol != IPPROTO_UDP &&
 165                             sk->sk_protocol != IPPROTO_UDPLITE &&
 166                             sk->sk_protocol != IPPROTO_TCP)
 167                                 break;
 168
 169                         if (sk->sk_state != TCP_ESTABLISHED) {
 170                                 retv = -ENOTCONN;
 171                                 break;
 172                         }
 173
 174                         if (ipv6_only_sock(sk) ||
 175                             !ipv6_addr_v4mapped(&np->daddr)) {
 176                                 retv = -EADDRNOTAVAIL;
 177                                 break;
 178                         }
 179
 180                         fl6_free_socklist(sk);
 181                         ipv6_sock_mc_close(sk);
 182
 183                         /*
 184                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 185                          * remove it from the refcnt debug socks count in the
 186                          * original family...
 187                          */
 188                         sk_refcnt_debug_dec(sk);
 189
 190                         if (sk->sk_protocol == IPPROTO_TCP) {
 191                                 struct inet_connection_sock *icsk = inet_csk(sk);
 192                                 local_bh_disable();
 193                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 194                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 195                                 local_bh_enable();
 196                                 sk->sk_prot = &tcp_prot;
 197                                 icsk->icsk_af_ops = &ipv4_specific;
 198                                 sk->sk_socket->ops = &inet_stream_ops;
 199                                 sk->sk_family = PF_INET;
 200                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 201                         } else {
 202                                 struct proto *prot = &udp_prot;
 203
 204                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 205                                         prot = &udplite_prot;
 206                                 local_bh_disable();
 207                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 208                                 sock_prot_inuse_add(net, prot, 1);
 209                                 local_bh_enable();
 210                                 sk->sk_prot = prot;
 211                                 sk->sk_socket->ops = &inet_dgram_ops;
 212                                 sk->sk_family = PF_INET;
 213                         }
 214                         opt = xchg(&np->opt, NULL);
 215                         if (opt)
 216                                 sock_kfree_s(sk, opt, opt->tot_len);
 217                         pktopt = xchg(&np->pktoptions, NULL);
 218                         if (pktopt)
 219                                 kfree_skb(pktopt);
 220
 221                         sk->sk_destruct = inet_sock_destruct;
 222                         /*
 223                          * ... and add it to the refcnt debug socks count
 224                          * in the new family. -acme
 225                          */
 226                         sk_refcnt_debug_inc(sk);
 227                         module_put(THIS_MODULE);
 228                         retv = 0;
 229                         break;
 230                 }
 231                 goto e_inval;
 232
 233         case IPV6_V6ONLY:
 234                 if (optlen < sizeof(int) ||
 235                     inet_sk(sk)->num)
 236                         goto e_inval;
 237                 np->ipv6only = valbool;
 238                 retv = 0;
 239                 break;
 240
 241         case IPV6_RECVPKTINFO:
 242                 if (optlen < sizeof(int))
 243                         goto e_inval;
 244                 np->rxopt.bits.rxinfo = valbool;
 245                 retv = 0;
 246                 break;
 247
 248         case IPV6_2292PKTINFO:
 249                 if (optlen < sizeof(int))
 250                         goto e_inval;
 251                 np->rxopt.bits.rxoinfo = valbool;
 252                 retv = 0;
 253                 break;
 254
 255         case IPV6_RECVHOPLIMIT:
 256                 if (optlen < sizeof(int))
 257                         goto e_inval;
 258                 np->rxopt.bits.rxhlim = valbool;
 259                 retv = 0;
 260                 break;
 261
 262         case IPV6_2292HOPLIMIT:
 263                 if (optlen < sizeof(int))
 264                         goto e_inval;
 265                 np->rxopt.bits.rxohlim = valbool;
 266                 retv = 0;
 267                 break;
 268
 269         case IPV6_RECVRTHDR:
 270                 if (optlen < sizeof(int))
 271                         goto e_inval;
 272                 np->rxopt.bits.srcrt = valbool;
 273                 retv = 0;
 274                 break;
 275
 276         case IPV6_2292RTHDR:
 277                 if (optlen < sizeof(int))
 278                         goto e_inval;
 279                 np->rxopt.bits.osrcrt = valbool;
 280                 retv = 0;
 281                 break;
 282
 283         case IPV6_RECVHOPOPTS:
 284                 if (optlen < sizeof(int))
 285                         goto e_inval;
 286                 np->rxopt.bits.hopopts = valbool;
 287                 retv = 0;
 288                 break;
 289
 290         case IPV6_2292HOPOPTS:
 291                 if (optlen < sizeof(int))
 292                         goto e_inval;
 293                 np->rxopt.bits.ohopopts = valbool;
 294                 retv = 0;
 295                 break;
 296
 297         case IPV6_RECVDSTOPTS:
 298                 if (optlen < sizeof(int))
 299                         goto e_inval;
 300                 np->rxopt.bits.dstopts = valbool;
 301                 retv = 0;
 302                 break;
 303
 304         case IPV6_2292DSTOPTS:
 305                 if (optlen < sizeof(int))
 306                         goto e_inval;
 307                 np->rxopt.bits.odstopts = valbool;
 308                 retv = 0;
 309                 break;
 310
 311         case IPV6_TCLASS:
 312                 if (optlen < sizeof(int))
 313                         goto e_inval;
 314                 if (val < -1 || val > 0xff)
 315                         goto e_inval;
 316                 np->tclass = val;
 317                 retv = 0;
 318                 break;
 319
 320         case IPV6_RECVTCLASS:
 321                 if (optlen < sizeof(int))
 322                         goto e_inval;
 323                 np->rxopt.bits.rxtclass = valbool;
 324                 retv = 0;
 325                 break;
 326
 327         case IPV6_FLOWINFO:
 328                 if (optlen < sizeof(int))
 329                         goto e_inval;
 330                 np->rxopt.bits.rxflow = valbool;
 331                 retv = 0;
 332                 break;
 333
 334         case IPV6_HOPOPTS:
 335         case IPV6_RTHDRDSTOPTS:
 336         case IPV6_RTHDR:
 337         case IPV6_DSTOPTS:
 338         {
 339                 struct ipv6_txoptions *opt;
 340                 if (optlen == 0)
 341                         optval = NULL;
 342
 343                 /* hop-by-hop / destination options are privileged option */
 344                 retv = -EPERM;
 345                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 346                         break;
 347
 348                 if (optlen < sizeof(struct ipv6_opt_hdr) ||
 349                     optlen & 0x7 || optlen > 8 * 255)
 350                         goto e_inval;
 351
 352                 opt = ipv6_renew_options(sk, np->opt, optname,
 353                                          (struct ipv6_opt_hdr __user *)optval,
 354                                          optlen);
 355                 if (IS_ERR(opt)) {
 356                         retv = PTR_ERR(opt);
 357                         break;
 358                 }
 359
 360                 /* routing header option needs extra check */
 361                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 362                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 363                         switch (rthdr->type) {
 364 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 365                         case IPV6_SRCRT_TYPE_2:
 366                                 break;
 367 #endif
 368                         default:
 369                                 goto sticky_done;
 370                         }
 371
 372                         if ((rthdr->hdrlen & 1) ||
 373                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 374                                 goto sticky_done;
 375                 }
 376
 377                 retv = 0;
 378                 opt = ipv6_update_options(sk, opt);
 379 sticky_done:
 380                 if (opt)
 381                         sock_kfree_s(sk, opt, opt->tot_len);
 382                 break;
 383         }
 384
 385         case IPV6_2292PKTOPTIONS:
 386         {
 387                 struct ipv6_txoptions *opt = NULL;
 388                 struct msghdr msg;
 389                 struct flowi fl;
 390                 int junk;
 391
 392                 fl.fl6_flowlabel = 0;
 393                 fl.oif = sk->sk_bound_dev_if;
 394
 395                 if (optlen == 0)
 396                         goto update;
 397
 398                 /* 1K is probably excessive
 399                  * 1K is surely not enough, 2K per standard header is 16K.
 400                  */
 401                 retv = -EINVAL;
 402                 if (optlen > 64*1024)
 403                         break;
 404
 405                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 406                 retv = -ENOBUFS;
 407                 if (opt == NULL)
 408                         break;
 409
 410                 memset(opt, 0, sizeof(*opt));
 411                 opt->tot_len = sizeof(*opt) + optlen;
 412                 retv = -EFAULT;
 413                 if (copy_from_user(opt+1, optval, optlen))
 414                         goto done;
 415
 416                 msg.msg_controllen = optlen;
 417                 msg.msg_control = (void*)(opt+1);
 418
 419                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 420                 if (retv)
 421                         goto done;
 422 update:
 423                 retv = 0;
 424                 opt = ipv6_update_options(sk, opt);
 425 done:
 426                 if (opt)
 427                         sock_kfree_s(sk, opt, opt->tot_len);
 428                 break;
 429         }
 430         case IPV6_UNICAST_HOPS:
 431                 if (optlen < sizeof(int))
 432                         goto e_inval;
 433                 if (val > 255 || val < -1)
 434                         goto e_inval;
 435                 np->hop_limit = val;
 436                 retv = 0;
 437                 break;
 438
 439         case IPV6_MULTICAST_HOPS:
 440                 if (sk->sk_type == SOCK_STREAM)
 441                         goto e_inval;
 442                 if (optlen < sizeof(int))
 443                         goto e_inval;
 444                 if (val > 255 || val < -1)
 445                         goto e_inval;
 446                 np->mcast_hops = val;
 447                 retv = 0;
 448                 break;
 449
 450         case IPV6_MULTICAST_LOOP:
 451                 if (optlen < sizeof(int))
 452                         goto e_inval;
 453                 np->mc_loop = valbool;
 454                 retv = 0;
 455                 break;
 456
 457         case IPV6_MULTICAST_IF:
 458                 if (sk->sk_type == SOCK_STREAM)
 459                         goto e_inval;
 460                 if (optlen < sizeof(int))
 461                         goto e_inval;
 462
 463                 if (val) {
 464                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 465                                 goto e_inval;
 466
 467                         if (__dev_get_by_index(net, val) == NULL) {
 468                                 retv = -ENODEV;
 469                                 break;
 470                         }
 471                 }
 472                 np->mcast_oif = val;
 473                 retv = 0;
 474                 break;
 475         case IPV6_ADD_MEMBERSHIP:
 476         case IPV6_DROP_MEMBERSHIP:
 477         {
 478                 struct ipv6_mreq mreq;
 479
 480                 if (optlen < sizeof(struct ipv6_mreq))
 481                         goto e_inval;
 482
 483                 retv = -EPROTO;
 484                 if (inet_sk(sk)->is_icsk)
 485                         break;
 486
 487                 retv = -EFAULT;
 488                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 489                         break;
 490
 491                 if (optname == IPV6_ADD_MEMBERSHIP)
 492                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 493                 else
 494                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 495                 break;
 496         }
 497         case IPV6_JOIN_ANYCAST:
 498         case IPV6_LEAVE_ANYCAST:
 499         {
 500                 struct ipv6_mreq mreq;
 501
 502                 if (optlen < sizeof(struct ipv6_mreq))
 503                         goto e_inval;
 504
 505                 retv = -EFAULT;
 506                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 507                         break;
 508
 509                 if (optname == IPV6_JOIN_ANYCAST)
 510                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 511                 else
 512                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 513                 break;
 514         }
 515         case MCAST_JOIN_GROUP:
 516         case MCAST_LEAVE_GROUP:
 517         {
 518                 struct group_req greq;
 519                 struct sockaddr_in6 *psin6;
 520
 521                 if (optlen < sizeof(struct group_req))
 522                         goto e_inval;
 523
 524                 retv = -EFAULT;
 525                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 526                         break;
 527                 if (greq.gr_group.ss_family != AF_INET6) {
 528                         retv = -EADDRNOTAVAIL;
 529                         break;
 530                 }
 531                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 532                 if (optname == MCAST_JOIN_GROUP)
 533                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 534                                 &psin6->sin6_addr);
 535                 else
 536                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 537                                 &psin6->sin6_addr);
 538                 break;
 539         }
 540         case MCAST_JOIN_SOURCE_GROUP:
 541         case MCAST_LEAVE_SOURCE_GROUP:
 542         case MCAST_BLOCK_SOURCE:
 543         case MCAST_UNBLOCK_SOURCE:
 544         {
 545                 struct group_source_req greqs;
 546                 int omode, add;
 547
 548                 if (optlen < sizeof(struct group_source_req))
 549                         goto e_inval;
 550                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 551                         retv = -EFAULT;
 552                         break;
 553                 }
 554                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 555                     greqs.gsr_source.ss_family != AF_INET6) {
 556                         retv = -EADDRNOTAVAIL;
 557                         break;
 558                 }
 559                 if (optname == MCAST_BLOCK_SOURCE) {
 560                         omode = MCAST_EXCLUDE;
 561                         add = 1;
 562                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 563                         omode = MCAST_EXCLUDE;
 564                         add = 0;
 565                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 566                         struct sockaddr_in6 *psin6;
 567
 568                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 569                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 570                                 &psin6->sin6_addr);
 571                         /* prior join w/ different source is ok */
 572                         if (retv && retv != -EADDRINUSE)
 573                                 break;
 574                         omode = MCAST_INCLUDE;
 575                         add = 1;
 576                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 577                         omode = MCAST_INCLUDE;
 578                         add = 0;
 579                 }
 580                 retv = ip6_mc_source(add, omode, sk, &greqs);
 581                 break;
 582         }
 583         case MCAST_MSFILTER:
 584         {
 585                 extern int sysctl_mld_max_msf;
 586                 struct group_filter *gsf;
 587
 588                 if (optlen < GROUP_FILTER_SIZE(0))
 589                         goto e_inval;
 590                 if (optlen > sysctl_optmem_max) {
 591                         retv = -ENOBUFS;
 592                         break;
 593                 }
 594                 gsf = kmalloc(optlen,GFP_KERNEL);
 595                 if (!gsf) {
 596                         retv = -ENOBUFS;
 597                         break;
 598                 }
 599                 retv = -EFAULT;
 600                 if (copy_from_user(gsf, optval, optlen)) {
 601                         kfree(gsf);
 602                         break;
 603                 }
 604                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 605                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 606                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 607                         kfree(gsf);
 608                         retv = -ENOBUFS;
 609                         break;
 610                 }
 611                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 612                         kfree(gsf);
 613                         retv = -EINVAL;
 614                         break;
 615                 }
 616                 retv = ip6_mc_msfilter(sk, gsf);
 617                 kfree(gsf);
 618
 619                 break;
 620         }
 621         case IPV6_ROUTER_ALERT:
 622                 if (optlen < sizeof(int))
 623                         goto e_inval;
 624                 retv = ip6_ra_control(sk, val, NULL);
 625                 break;
 626         case IPV6_MTU_DISCOVER:
 627                 if (optlen < sizeof(int))
 628                         goto e_inval;
 629                 if (val<0 || val>3)
 630                         goto e_inval;
 631                 np->pmtudisc = val;
 632                 retv = 0;
 633                 break;
 634         case IPV6_MTU:
 635                 if (optlen < sizeof(int))
 636                         goto e_inval;
 637                 if (val && val < IPV6_MIN_MTU)
 638                         goto e_inval;
 639                 np->frag_size = val;
 640                 retv = 0;
 641                 break;
 642         case IPV6_RECVERR:
 643                 if (optlen < sizeof(int))
 644                         goto e_inval;
 645                 np->recverr = valbool;
 646                 if (!val)
 647                         skb_queue_purge(&sk->sk_error_queue);
 648                 retv = 0;
 649                 break;
 650         case IPV6_FLOWINFO_SEND:
 651                 if (optlen < sizeof(int))
 652                         goto e_inval;
 653                 np->sndflow = valbool;
 654                 retv = 0;
 655                 break;
 656         case IPV6_FLOWLABEL_MGR:
 657                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 658                 break;
 659         case IPV6_IPSEC_POLICY:
 660         case IPV6_XFRM_POLICY:
 661                 retv = -EPERM;
 662                 if (!capable(CAP_NET_ADMIN))
 663                         break;
 664                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 665                 break;
 666
 667         case IPV6_ADDR_PREFERENCES:
 668             {
 669                 unsigned int pref = 0;
 670                 unsigned int prefmask = ~0;
 671
 672                 if (optlen < sizeof(int))
 673                         goto e_inval;
 674
 675                 retv = -EINVAL;
 676
 677                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 678                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 679                                IPV6_PREFER_SRC_TMP|
 680                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 681                 case IPV6_PREFER_SRC_PUBLIC:
 682                         pref |= IPV6_PREFER_SRC_PUBLIC;
 683                         break;
 684                 case IPV6_PREFER_SRC_TMP:
 685                         pref |= IPV6_PREFER_SRC_TMP;
 686                         break;
 687                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 688                         break;
 689                 case 0:
 690                         goto pref_skip_pubtmp;
 691                 default:
 692                         goto e_inval;
 693                 }
 694
 695                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 696                               IPV6_PREFER_SRC_TMP);
 697 pref_skip_pubtmp:
 698
 699                 /* check HOME/COA conflicts */
 700                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 701                 case IPV6_PREFER_SRC_HOME:
 702                         break;
 703                 case IPV6_PREFER_SRC_COA:
 704                         pref |= IPV6_PREFER_SRC_COA;
 705                 case 0:
 706                         goto pref_skip_coa;
 707                 default:
 708                         goto e_inval;
 709                 }
 710
 711                 prefmask &= ~IPV6_PREFER_SRC_COA;
 712 pref_skip_coa:
 713
 714                 /* check CGA/NONCGA conflicts */
 715                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 716                 case IPV6_PREFER_SRC_CGA:
 717                 case IPV6_PREFER_SRC_NONCGA:
 718                 case 0:
 719                         break;
 720                 default:
 721                         goto e_inval;
 722                 }
 723
 724                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 725                 retv = 0;
 726
 727                 break;
 728             }
 729         }
 730
 731         release_sock(sk);
 732
 733         return retv;
 734
 735 e_inval:
 736         release_sock(sk);
 737         return -EINVAL;
 738 }
 739
 740 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 741                     char __user *optval, int optlen)
 742 {
 743         int err;
 744
 745         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 746                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 747
 748         if (level != SOL_IPV6)
 749                 return -ENOPROTOOPT;
 750
 751         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 752 #ifdef CONFIG_NETFILTER
 753         /* we need to exclude all possible ENOPROTOOPTs except default case */
 754         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 755                         optname != IPV6_XFRM_POLICY) {
 756                 lock_sock(sk);
 757                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 758                                 optlen);
 759                 release_sock(sk);
 760         }
 761 #endif
 762         return err;
 763 }
 764
 765 EXPORT_SYMBOL(ipv6_setsockopt);
 766
 767 #ifdef CONFIG_COMPAT
 768 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 769                            char __user *optval, int optlen)
 770 {
 771         int err;
 772
 773         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 774                 if (udp_prot.compat_setsockopt != NULL)
 775                         return udp_prot.compat_setsockopt(sk, level, optname,
 776                                                           optval, optlen);
 777                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 778         }
 779
 780         if (level != SOL_IPV6)
 781                 return -ENOPROTOOPT;
 782
 783         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 784                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 785                         ipv6_setsockopt);
 786
 787         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 788 #ifdef CONFIG_NETFILTER
 789         /* we need to exclude all possible ENOPROTOOPTs except default case */
 790         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 791             optname != IPV6_XFRM_POLICY) {
 792                 lock_sock(sk);
 793                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 794                                            optval, optlen);
 795                 release_sock(sk);
 796         }
 797 #endif
 798         return err;
 799 }
 800
 801 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 802 #endif
 803
 804 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 805                                   int optname, char __user *optval, int len)
 806 {
 807         struct ipv6_opt_hdr *hdr;
 808
 809         if (!opt)
 810                 return 0;
 811
 812         switch(optname) {
 813         case IPV6_HOPOPTS:
 814                 hdr = opt->hopopt;
 815                 break;
 816         case IPV6_RTHDRDSTOPTS:
 817                 hdr = opt->dst0opt;
 818                 break;
 819         case IPV6_RTHDR:
 820                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 821                 break;
 822         case IPV6_DSTOPTS:
 823                 hdr = opt->dst1opt;
 824                 break;
 825         default:
 826                 return -EINVAL; /* should not happen */
 827         }
 828
 829         if (!hdr)
 830                 return 0;
 831
 832         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 833         if (copy_to_user(optval, hdr, len))
 834                 return -EFAULT;
 835         return ipv6_optlen(hdr);
 836 }
 837
 838 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 839                     char __user *optval, int __user *optlen)
 840 {
 841         struct ipv6_pinfo *np = inet6_sk(sk);
 842         int len;
 843         int val;
 844
 845         if (ip6_mroute_opt(optname))
 846                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 847
 848         if (get_user(len, optlen))
 849                 return -EFAULT;
 850         switch (optname) {
 851         case IPV6_ADDRFORM:
 852                 if (sk->sk_protocol != IPPROTO_UDP &&
 853                     sk->sk_protocol != IPPROTO_UDPLITE &&
 854                     sk->sk_protocol != IPPROTO_TCP)
 855                         return -EINVAL;
 856                 if (sk->sk_state != TCP_ESTABLISHED)
 857                         return -ENOTCONN;
 858                 val = sk->sk_family;
 859                 break;
 860         case MCAST_MSFILTER:
 861         {
 862                 struct group_filter gsf;
 863                 int err;
 864
 865                 if (len < GROUP_FILTER_SIZE(0))
 866                         return -EINVAL;
 867                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 868                         return -EFAULT;
 869                 lock_sock(sk);
 870                 err = ip6_mc_msfget(sk, &gsf,
 871                         (struct group_filter __user *)optval, optlen);
 872                 release_sock(sk);
 873                 return err;
 874         }
 875
 876         case IPV6_2292PKTOPTIONS:
 877         {
 878                 struct msghdr msg;
 879                 struct sk_buff *skb;
 880
 881                 if (sk->sk_type != SOCK_STREAM)
 882                         return -ENOPROTOOPT;
 883
 884                 msg.msg_control = optval;
 885                 msg.msg_controllen = len;
 886                 msg.msg_flags = 0;
 887
 888                 lock_sock(sk);
 889                 skb = np->pktoptions;
 890                 if (skb)
 891                         atomic_inc(&skb->users);
 892                 release_sock(sk);
 893
 894                 if (skb) {
 895                         int err = datagram_recv_ctl(sk, &msg, skb);
 896                         kfree_skb(skb);
 897                         if (err)
 898                                 return err;
 899                 } else {
 900                         if (np->rxopt.bits.rxinfo) {
 901                                 struct in6_pktinfo src_info;
 902                                 src_info.ipi6_ifindex = np->mcast_oif;
 903                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 904                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 905                         }
 906                         if (np->rxopt.bits.rxhlim) {
 907                                 int hlim = np->mcast_hops;
 908                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 909                         }
 910                         if (np->rxopt.bits.rxoinfo) {
 911                                 struct in6_pktinfo src_info;
 912                                 src_info.ipi6_ifindex = np->mcast_oif;
 913                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 914                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 915                         }
 916                         if (np->rxopt.bits.rxohlim) {
 917                                 int hlim = np->mcast_hops;
 918                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 919                         }
 920                 }
 921                 len -= msg.msg_controllen;
 922                 return put_user(len, optlen);
 923         }
 924         case IPV6_MTU:
 925         {
 926                 struct dst_entry *dst;
 927                 val = 0;
 928                 lock_sock(sk);
 929                 dst = sk_dst_get(sk);
 930                 if (dst) {
 931                         val = dst_mtu(dst);
 932                         dst_release(dst);
 933                 }
 934                 release_sock(sk);
 935                 if (!val)
 936                         return -ENOTCONN;
 937                 break;
 938         }
 939
 940         case IPV6_V6ONLY:
 941                 val = np->ipv6only;
 942                 break;
 943
 944         case IPV6_RECVPKTINFO:
 945                 val = np->rxopt.bits.rxinfo;
 946                 break;
 947
 948         case IPV6_2292PKTINFO:
 949                 val = np->rxopt.bits.rxoinfo;
 950                 break;
 951
 952         case IPV6_RECVHOPLIMIT:
 953                 val = np->rxopt.bits.rxhlim;
 954                 break;
 955
 956         case IPV6_2292HOPLIMIT:
 957                 val = np->rxopt.bits.rxohlim;
 958                 break;
 959
 960         case IPV6_RECVRTHDR:
 961                 val = np->rxopt.bits.srcrt;
 962                 break;
 963
 964         case IPV6_2292RTHDR:
 965                 val = np->rxopt.bits.osrcrt;
 966                 break;
 967
 968         case IPV6_HOPOPTS:
 969         case IPV6_RTHDRDSTOPTS:
 970         case IPV6_RTHDR:
 971         case IPV6_DSTOPTS:
 972         {
 973
 974                 lock_sock(sk);
 975                 len = ipv6_getsockopt_sticky(sk, np->opt,
 976                                              optname, optval, len);
 977                 release_sock(sk);
 978                 return put_user(len, optlen);
 979         }
 980
 981         case IPV6_RECVHOPOPTS:
 982                 val = np->rxopt.bits.hopopts;
 983                 break;
 984
 985         case IPV6_2292HOPOPTS:
 986                 val = np->rxopt.bits.ohopopts;
 987                 break;
 988
 989         case IPV6_RECVDSTOPTS:
 990                 val = np->rxopt.bits.dstopts;
 991                 break;
 992
 993         case IPV6_2292DSTOPTS:
 994                 val = np->rxopt.bits.odstopts;
 995                 break;
 996
 997         case IPV6_TCLASS:
 998                 val = np->tclass;
 999                 if (val < 0)
1000                         val = 0;
1001                 break;
1002
1003         case IPV6_RECVTCLASS:
1004                 val = np->rxopt.bits.rxtclass;
1005                 break;
1006
1007         case IPV6_FLOWINFO:
1008                 val = np->rxopt.bits.rxflow;
1009                 break;
1010
1011         case IPV6_UNICAST_HOPS:
1012         case IPV6_MULTICAST_HOPS:
1013         {
1014                 struct dst_entry *dst;
1015
1016                 if (optname == IPV6_UNICAST_HOPS)
1017                         val = np->hop_limit;
1018                 else
1019                         val = np->mcast_hops;
1020
1021                 dst = sk_dst_get(sk);
1022                 if (dst) {
1023                         if (val < 0)
1024                                 val = ip6_dst_hoplimit(dst);
1025                         dst_release(dst);
1026                 }
1027                 if (val < 0)
1028                         val = ipv6_devconf.hop_limit;
1029                 break;
1030         }
1031
1032         case IPV6_MULTICAST_LOOP:
1033                 val = np->mc_loop;
1034                 break;
1035
1036         case IPV6_MULTICAST_IF:
1037                 val = np->mcast_oif;
1038                 break;
1039
1040         case IPV6_MTU_DISCOVER:
1041                 val = np->pmtudisc;
1042                 break;
1043
1044         case IPV6_RECVERR:
1045                 val = np->recverr;
1046                 break;
1047
1048         case IPV6_FLOWINFO_SEND:
1049                 val = np->sndflow;
1050                 break;
1051
1052         case IPV6_ADDR_PREFERENCES:
1053                 val = 0;
1054
1055                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1056                         val |= IPV6_PREFER_SRC_TMP;
1057                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1058                         val |= IPV6_PREFER_SRC_PUBLIC;
1059                 else {
1060                         /* XXX: should we return system default? */
1061                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1062                 }
1063
1064                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1065                         val |= IPV6_PREFER_SRC_COA;
1066                 else
1067                         val |= IPV6_PREFER_SRC_HOME;
1068                 break;
1069
1070         default:
1071                 return -ENOPROTOOPT;
1072         }
1073         len = min_t(unsigned int, sizeof(int), len);
1074         if(put_user(len, optlen))
1075                 return -EFAULT;
1076         if(copy_to_user(optval,&val,len))
1077                 return -EFAULT;
1078         return 0;
1079 }
1080
1081 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1082                     char __user *optval, int __user *optlen)
1083 {
1084         int err;
1085
1086         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1087                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1088
1089         if(level != SOL_IPV6)
1090                 return -ENOPROTOOPT;
1091
1092         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1093 #ifdef CONFIG_NETFILTER
1094         /* we need to exclude all possible ENOPROTOOPTs except default case */
1095         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1096                 int len;
1097
1098                 if (get_user(len, optlen))
1099                         return -EFAULT;
1100
1101                 lock_sock(sk);
1102                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1103                                 &len);
1104                 release_sock(sk);
1105                 if (err >= 0)
1106                         err = put_user(len, optlen);
1107         }
1108 #endif
1109         return err;
1110 }
1111
1112 EXPORT_SYMBOL(ipv6_getsockopt);
1113
1114 #ifdef CONFIG_COMPAT
1115 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1116                            char __user *optval, int __user *optlen)
1117 {
1118         int err;
1119
1120         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1121                 if (udp_prot.compat_getsockopt != NULL)
1122                         return udp_prot.compat_getsockopt(sk, level, optname,
1123                                                           optval, optlen);
1124                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1125         }
1126
1127         if (level != SOL_IPV6)
1128                 return -ENOPROTOOPT;
1129
1130         if (optname == MCAST_MSFILTER)
1131                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1132                         ipv6_getsockopt);
1133
1134         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1135 #ifdef CONFIG_NETFILTER
1136         /* we need to exclude all possible ENOPROTOOPTs except default case */
1137         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1138                 int len;
1139
1140                 if (get_user(len, optlen))
1141                         return -EFAULT;
1142
1143                 lock_sock(sk);
1144                 err = compat_nf_getsockopt(sk, PF_INET6,
1145                                            optname, optval, &len);
1146                 release_sock(sk);
1147                 if (err >= 0)
1148                         err = put_user(len, optlen);
1149         }
1150 #endif
1151         return err;
1152 }
1153
1154 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1155 #endif
1156