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