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