net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  *
  15  *      FIXME: Make the setsockopt code POSIX compliant: That is
  16  *
  17  *      o       Truncate getsockopt returns
  18  *      o       Return an optlen of the truncated length if need be
  19  *
  20  *      Changes:
  21  *      David L Stevens <dlstevens@us.ibm.com>:
  22  *              - added multicast source filtering API for MLDv2
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/capability.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/socket.h>
  30 #include <linux/sockios.h>
  31 #include <linux/net.h>
  32 #include <linux/in6.h>
  33 #include <linux/mroute6.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/init.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/netfilter.h>
  39 #include <linux/slab.h>
  40
  41 #include <net/sock.h>
  42 #include <net/snmp.h>
  43 #include <net/ipv6.h>
  44 #include <net/ndisc.h>
  45 #include <net/protocol.h>
  46 #include <net/transp_v6.h>
  47 #include <net/ip6_route.h>
  48 #include <net/addrconf.h>
  49 #include <net/inet_common.h>
  50 #include <net/tcp.h>
  51 #include <net/udp.h>
  52 #include <net/udplite.h>
  53 #include <net/xfrm.h>
  54 #include <net/compat.h>
  55
  56 #include <asm/uaccess.h>
  57
  58 struct ip6_ra_chain *ip6_ra_chain;
  59 DEFINE_RWLOCK(ip6_ra_lock);
  60
  61 int ip6_ra_control(struct sock *sk, int sel)
  62 {
  63         struct ip6_ra_chain *ra, *new_ra, **rap;
  64
  65         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  66         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  67                 return -ENOPROTOOPT;
  68
  69         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  70
  71         write_lock_bh(&ip6_ra_lock);
  72         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  73                 if (ra->sk == sk) {
  74                         if (sel>=0) {
  75                                 write_unlock_bh(&ip6_ra_lock);
  76                                 kfree(new_ra);
  77                                 return -EADDRINUSE;
  78                         }
  79
  80                         *rap = ra->next;
  81                         write_unlock_bh(&ip6_ra_lock);
  82
  83                         sock_put(sk);
  84                         kfree(ra);
  85                         return 0;
  86                 }
  87         }
  88         if (new_ra == NULL) {
  89                 write_unlock_bh(&ip6_ra_lock);
  90                 return -ENOBUFS;
  91         }
  92         new_ra->sk = sk;
  93         new_ra->sel = sel;
  94         new_ra->next = ra;
  95         *rap = new_ra;
  96         sock_hold(sk);
  97         write_unlock_bh(&ip6_ra_lock);
  98         return 0;
  99 }
 100
 101 static
 102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 103                                            struct ipv6_txoptions *opt)
 104 {
 105         if (inet_sk(sk)->is_icsk) {
 106                 if (opt &&
 107                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 108                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 109                         struct inet_connection_sock *icsk = inet_csk(sk);
 110                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 111                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 112                 }
 113                 opt = xchg(&inet6_sk(sk)->opt, opt);
 114         } else {
 115                 spin_lock(&sk->sk_dst_lock);
 116                 opt = xchg(&inet6_sk(sk)->opt, opt);
 117                 spin_unlock(&sk->sk_dst_lock);
 118         }
 119         sk_dst_reset(sk);
 120
 121         return opt;
 122 }
 123
 124 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 125                     char __user *optval, unsigned int optlen)
 126 {
 127         struct ipv6_pinfo *np = inet6_sk(sk);
 128         struct net *net = sock_net(sk);
 129         int val, valbool;
 130         int retv = -ENOPROTOOPT;
 131
 132         if (optval == NULL)
 133                 val=0;
 134         else {
 135                 if (optlen >= sizeof(int)) {
 136                         if (get_user(val, (int __user *) optval))
 137                                 return -EFAULT;
 138                 } else
 139                         val = 0;
 140         }
 141
 142         valbool = (val!=0);
 143
 144         if (ip6_mroute_opt(optname))
 145                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 146
 147         lock_sock(sk);
 148
 149         switch (optname) {
 150
 151         case IPV6_ADDRFORM:
 152                 if (optlen < sizeof(int))
 153                         goto e_inval;
 154                 if (val == PF_INET) {
 155                         struct ipv6_txoptions *opt;
 156                         struct sk_buff *pktopt;
 157
 158                         if (sk->sk_type == SOCK_RAW)
 159                                 break;
 160
 161                         if (sk->sk_protocol == IPPROTO_UDP ||
 162                             sk->sk_protocol == IPPROTO_UDPLITE) {
 163                                 struct udp_sock *up = udp_sk(sk);
 164                                 if (up->pending == AF_INET6) {
 165                                         retv = -EBUSY;
 166                                         break;
 167                                 }
 168                         } else if (sk->sk_protocol != IPPROTO_TCP)
 169                                 break;
 170
 171                         if (sk->sk_state != TCP_ESTABLISHED) {
 172                                 retv = -ENOTCONN;
 173                                 break;
 174                         }
 175
 176                         if (ipv6_only_sock(sk) ||
 177                             !ipv6_addr_v4mapped(&np->daddr)) {
 178                                 retv = -EADDRNOTAVAIL;
 179                                 break;
 180                         }
 181
 182                         fl6_free_socklist(sk);
 183                         ipv6_sock_mc_close(sk);
 184
 185                         /*
 186                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 187                          * remove it from the refcnt debug socks count in the
 188                          * original family...
 189                          */
 190                         sk_refcnt_debug_dec(sk);
 191
 192                         if (sk->sk_protocol == IPPROTO_TCP) {
 193                                 struct inet_connection_sock *icsk = inet_csk(sk);
 194                                 local_bh_disable();
 195                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 196                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 197                                 local_bh_enable();
 198                                 sk->sk_prot = &tcp_prot;
 199                                 icsk->icsk_af_ops = &ipv4_specific;
 200                                 sk->sk_socket->ops = &inet_stream_ops;
 201                                 sk->sk_family = PF_INET;
 202                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 203                         } else {
 204                                 struct proto *prot = &udp_prot;
 205
 206                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 207                                         prot = &udplite_prot;
 208                                 local_bh_disable();
 209                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 210                                 sock_prot_inuse_add(net, prot, 1);
 211                                 local_bh_enable();
 212                                 sk->sk_prot = prot;
 213                                 sk->sk_socket->ops = &inet_dgram_ops;
 214                                 sk->sk_family = PF_INET;
 215                         }
 216                         opt = xchg(&np->opt, NULL);
 217                         if (opt)
 218                                 sock_kfree_s(sk, opt, opt->tot_len);
 219                         pktopt = xchg(&np->pktoptions, NULL);
 220                         kfree_skb(pktopt);
 221
 222                         sk->sk_destruct = inet_sock_destruct;
 223                         /*
 224                          * ... and add it to the refcnt debug socks count
 225                          * in the new family. -acme
 226                          */
 227                         sk_refcnt_debug_inc(sk);
 228                         module_put(THIS_MODULE);
 229                         retv = 0;
 230                         break;
 231                 }
 232                 goto e_inval;
 233
 234         case IPV6_V6ONLY:
 235                 if (optlen < sizeof(int) ||
 236                     inet_sk(sk)->inet_num)
 237                         goto e_inval;
 238                 np->ipv6only = valbool;
 239                 retv = 0;
 240                 break;
 241
 242         case IPV6_RECVPKTINFO:
 243                 if (optlen < sizeof(int))
 244                         goto e_inval;
 245                 np->rxopt.bits.rxinfo = valbool;
 246                 retv = 0;
 247                 break;
 248
 249         case IPV6_2292PKTINFO:
 250                 if (optlen < sizeof(int))
 251                         goto e_inval;
 252                 np->rxopt.bits.rxoinfo = valbool;
 253                 retv = 0;
 254                 break;
 255
 256         case IPV6_RECVHOPLIMIT:
 257                 if (optlen < sizeof(int))
 258                         goto e_inval;
 259                 np->rxopt.bits.rxhlim = valbool;
 260                 retv = 0;
 261                 break;
 262
 263         case IPV6_2292HOPLIMIT:
 264                 if (optlen < sizeof(int))
 265                         goto e_inval;
 266                 np->rxopt.bits.rxohlim = valbool;
 267                 retv = 0;
 268                 break;
 269
 270         case IPV6_RECVRTHDR:
 271                 if (optlen < sizeof(int))
 272                         goto e_inval;
 273                 np->rxopt.bits.srcrt = valbool;
 274                 retv = 0;
 275                 break;
 276
 277         case IPV6_2292RTHDR:
 278                 if (optlen < sizeof(int))
 279                         goto e_inval;
 280                 np->rxopt.bits.osrcrt = valbool;
 281                 retv = 0;
 282                 break;
 283
 284         case IPV6_RECVHOPOPTS:
 285                 if (optlen < sizeof(int))
 286                         goto e_inval;
 287                 np->rxopt.bits.hopopts = valbool;
 288                 retv = 0;
 289                 break;
 290
 291         case IPV6_2292HOPOPTS:
 292                 if (optlen < sizeof(int))
 293                         goto e_inval;
 294                 np->rxopt.bits.ohopopts = valbool;
 295                 retv = 0;
 296                 break;
 297
 298         case IPV6_RECVDSTOPTS:
 299                 if (optlen < sizeof(int))
 300                         goto e_inval;
 301                 np->rxopt.bits.dstopts = valbool;
 302                 retv = 0;
 303                 break;
 304
 305         case IPV6_2292DSTOPTS:
 306                 if (optlen < sizeof(int))
 307                         goto e_inval;
 308                 np->rxopt.bits.odstopts = valbool;
 309                 retv = 0;
 310                 break;
 311
 312         case IPV6_TCLASS:
 313                 if (optlen < sizeof(int))
 314                         goto e_inval;
 315                 if (val < -1 || val > 0xff)
 316                         goto e_inval;
 317                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 318                 if (val == -1)
 319                         val = 0;
 320                 np->tclass = val;
 321                 retv = 0;
 322                 break;
 323
 324         case IPV6_RECVTCLASS:
 325                 if (optlen < sizeof(int))
 326                         goto e_inval;
 327                 np->rxopt.bits.rxtclass = valbool;
 328                 retv = 0;
 329                 break;
 330
 331         case IPV6_FLOWINFO:
 332                 if (optlen < sizeof(int))
 333                         goto e_inval;
 334                 np->rxopt.bits.rxflow = valbool;
 335                 retv = 0;
 336                 break;
 337
 338         case IPV6_RECVPATHMTU:
 339                 if (optlen < sizeof(int))
 340                         goto e_inval;
 341                 np->rxopt.bits.rxpmtu = valbool;
 342                 retv = 0;
 343                 break;
 344
 345         case IPV6_TRANSPARENT:
 346                 if (!capable(CAP_NET_ADMIN)) {
 347                         retv = -EPERM;
 348                         break;
 349                 }
 350                 if (optlen < sizeof(int))
 351                         goto e_inval;
 352                 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 353                 inet_sk(sk)->transparent = valbool;
 354                 retv = 0;
 355                 break;
 356
 357         case IPV6_RECVORIGDSTADDR:
 358                 if (optlen < sizeof(int))
 359                         goto e_inval;
 360                 np->rxopt.bits.rxorigdstaddr = valbool;
 361                 retv = 0;
 362                 break;
 363
 364         case IPV6_HOPOPTS:
 365         case IPV6_RTHDRDSTOPTS:
 366         case IPV6_RTHDR:
 367         case IPV6_DSTOPTS:
 368         {
 369                 struct ipv6_txoptions *opt;
 370
 371                 /* remove any sticky options header with a zero option
 372                  * length, per RFC3542.
 373                  */
 374                 if (optlen == 0)
 375                         optval = NULL;
 376                 else if (optval == NULL)
 377                         goto e_inval;
 378                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 379                          optlen & 0x7 || optlen > 8 * 255)
 380                         goto e_inval;
 381
 382                 /* hop-by-hop / destination options are privileged option */
 383                 retv = -EPERM;
 384                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 385                         break;
 386
 387                 opt = ipv6_renew_options(sk, np->opt, optname,
 388                                          (struct ipv6_opt_hdr __user *)optval,
 389                                          optlen);
 390                 if (IS_ERR(opt)) {
 391                         retv = PTR_ERR(opt);
 392                         break;
 393                 }
 394
 395                 /* routing header option needs extra check */
 396                 retv = -EINVAL;
 397                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 398                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 399                         switch (rthdr->type) {
 400 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 401                         case IPV6_SRCRT_TYPE_2:
 402                                 if (rthdr->hdrlen != 2 ||
 403                                     rthdr->segments_left != 1)
 404                                         goto sticky_done;
 405
 406                                 break;
 407 #endif
 408                         default:
 409                                 goto sticky_done;
 410                         }
 411                 }
 412
 413                 retv = 0;
 414                 opt = ipv6_update_options(sk, opt);
 415 sticky_done:
 416                 if (opt)
 417                         sock_kfree_s(sk, opt, opt->tot_len);
 418                 break;
 419         }
 420
 421         case IPV6_PKTINFO:
 422         {
 423                 struct in6_pktinfo pkt;
 424
 425                 if (optlen == 0)
 426                         goto e_inval;
 427                 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
 428                         goto e_inval;
 429
 430                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 431                                 retv = -EFAULT;
 432                                 break;
 433                 }
 434                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 435                         goto e_inval;
 436
 437                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 438                 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
 439                 retv = 0;
 440                 break;
 441         }
 442
 443         case IPV6_2292PKTOPTIONS:
 444         {
 445                 struct ipv6_txoptions *opt = NULL;
 446                 struct msghdr msg;
 447                 struct flowi fl;
 448                 int junk;
 449
 450                 fl.fl6_flowlabel = 0;
 451                 fl.oif = sk->sk_bound_dev_if;
 452                 fl.mark = sk->sk_mark;
 453
 454                 if (optlen == 0)
 455                         goto update;
 456
 457                 /* 1K is probably excessive
 458                  * 1K is surely not enough, 2K per standard header is 16K.
 459                  */
 460                 retv = -EINVAL;
 461                 if (optlen > 64*1024)
 462                         break;
 463
 464                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 465                 retv = -ENOBUFS;
 466                 if (opt == NULL)
 467                         break;
 468
 469                 memset(opt, 0, sizeof(*opt));
 470                 opt->tot_len = sizeof(*opt) + optlen;
 471                 retv = -EFAULT;
 472                 if (copy_from_user(opt+1, optval, optlen))
 473                         goto done;
 474
 475                 msg.msg_controllen = optlen;
 476                 msg.msg_control = (void*)(opt+1);
 477
 478                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk,
 479                                          &junk);
 480                 if (retv)
 481                         goto done;
 482 update:
 483                 retv = 0;
 484                 opt = ipv6_update_options(sk, opt);
 485 done:
 486                 if (opt)
 487                         sock_kfree_s(sk, opt, opt->tot_len);
 488                 break;
 489         }
 490         case IPV6_UNICAST_HOPS:
 491                 if (optlen < sizeof(int))
 492                         goto e_inval;
 493                 if (val > 255 || val < -1)
 494                         goto e_inval;
 495                 np->hop_limit = val;
 496                 retv = 0;
 497                 break;
 498
 499         case IPV6_MULTICAST_HOPS:
 500                 if (sk->sk_type == SOCK_STREAM)
 501                         break;
 502                 if (optlen < sizeof(int))
 503                         goto e_inval;
 504                 if (val > 255 || val < -1)
 505                         goto e_inval;
 506                 np->mcast_hops = val;
 507                 retv = 0;
 508                 break;
 509
 510         case IPV6_MULTICAST_LOOP:
 511                 if (optlen < sizeof(int))
 512                         goto e_inval;
 513                 if (val != valbool)
 514                         goto e_inval;
 515                 np->mc_loop = valbool;
 516                 retv = 0;
 517                 break;
 518
 519         case IPV6_MULTICAST_IF:
 520                 if (sk->sk_type == SOCK_STREAM)
 521                         break;
 522                 if (optlen < sizeof(int))
 523                         goto e_inval;
 524
 525                 if (val) {
 526                         struct net_device *dev;
 527
 528                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 529                                 goto e_inval;
 530
 531                         dev = dev_get_by_index(net, val);
 532                         if (!dev) {
 533                                 retv = -ENODEV;
 534                                 break;
 535                         }
 536                         dev_put(dev);
 537                 }
 538                 np->mcast_oif = val;
 539                 retv = 0;
 540                 break;
 541         case IPV6_ADD_MEMBERSHIP:
 542         case IPV6_DROP_MEMBERSHIP:
 543         {
 544                 struct ipv6_mreq mreq;
 545
 546                 if (optlen < sizeof(struct ipv6_mreq))
 547                         goto e_inval;
 548
 549                 retv = -EPROTO;
 550                 if (inet_sk(sk)->is_icsk)
 551                         break;
 552
 553                 retv = -EFAULT;
 554                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 555                         break;
 556
 557                 if (optname == IPV6_ADD_MEMBERSHIP)
 558                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 559                 else
 560                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 561                 break;
 562         }
 563         case IPV6_JOIN_ANYCAST:
 564         case IPV6_LEAVE_ANYCAST:
 565         {
 566                 struct ipv6_mreq mreq;
 567
 568                 if (optlen < sizeof(struct ipv6_mreq))
 569                         goto e_inval;
 570
 571                 retv = -EFAULT;
 572                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 573                         break;
 574
 575                 if (optname == IPV6_JOIN_ANYCAST)
 576                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 577                 else
 578                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 579                 break;
 580         }
 581         case MCAST_JOIN_GROUP:
 582         case MCAST_LEAVE_GROUP:
 583         {
 584                 struct group_req greq;
 585                 struct sockaddr_in6 *psin6;
 586
 587                 if (optlen < sizeof(struct group_req))
 588                         goto e_inval;
 589
 590                 retv = -EFAULT;
 591                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 592                         break;
 593                 if (greq.gr_group.ss_family != AF_INET6) {
 594                         retv = -EADDRNOTAVAIL;
 595                         break;
 596                 }
 597                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 598                 if (optname == MCAST_JOIN_GROUP)
 599                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 600                                 &psin6->sin6_addr);
 601                 else
 602                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 603                                 &psin6->sin6_addr);
 604                 break;
 605         }
 606         case MCAST_JOIN_SOURCE_GROUP:
 607         case MCAST_LEAVE_SOURCE_GROUP:
 608         case MCAST_BLOCK_SOURCE:
 609         case MCAST_UNBLOCK_SOURCE:
 610         {
 611                 struct group_source_req greqs;
 612                 int omode, add;
 613
 614                 if (optlen < sizeof(struct group_source_req))
 615                         goto e_inval;
 616                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 617                         retv = -EFAULT;
 618                         break;
 619                 }
 620                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 621                     greqs.gsr_source.ss_family != AF_INET6) {
 622                         retv = -EADDRNOTAVAIL;
 623                         break;
 624                 }
 625                 if (optname == MCAST_BLOCK_SOURCE) {
 626                         omode = MCAST_EXCLUDE;
 627                         add = 1;
 628                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 629                         omode = MCAST_EXCLUDE;
 630                         add = 0;
 631                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 632                         struct sockaddr_in6 *psin6;
 633
 634                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 635                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 636                                 &psin6->sin6_addr);
 637                         /* prior join w/ different source is ok */
 638                         if (retv && retv != -EADDRINUSE)
 639                                 break;
 640                         omode = MCAST_INCLUDE;
 641                         add = 1;
 642                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 643                         omode = MCAST_INCLUDE;
 644                         add = 0;
 645                 }
 646                 retv = ip6_mc_source(add, omode, sk, &greqs);
 647                 break;
 648         }
 649         case MCAST_MSFILTER:
 650         {
 651                 extern int sysctl_mld_max_msf;
 652                 struct group_filter *gsf;
 653
 654                 if (optlen < GROUP_FILTER_SIZE(0))
 655                         goto e_inval;
 656                 if (optlen > sysctl_optmem_max) {
 657                         retv = -ENOBUFS;
 658                         break;
 659                 }
 660                 gsf = kmalloc(optlen,GFP_KERNEL);
 661                 if (!gsf) {
 662                         retv = -ENOBUFS;
 663                         break;
 664                 }
 665                 retv = -EFAULT;
 666                 if (copy_from_user(gsf, optval, optlen)) {
 667                         kfree(gsf);
 668                         break;
 669                 }
 670                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 671                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 672                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 673                         kfree(gsf);
 674                         retv = -ENOBUFS;
 675                         break;
 676                 }
 677                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 678                         kfree(gsf);
 679                         retv = -EINVAL;
 680                         break;
 681                 }
 682                 retv = ip6_mc_msfilter(sk, gsf);
 683                 kfree(gsf);
 684
 685                 break;
 686         }
 687         case IPV6_ROUTER_ALERT:
 688                 if (optlen < sizeof(int))
 689                         goto e_inval;
 690                 retv = ip6_ra_control(sk, val);
 691                 break;
 692         case IPV6_MTU_DISCOVER:
 693                 if (optlen < sizeof(int))
 694                         goto e_inval;
 695                 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
 696                         goto e_inval;
 697                 np->pmtudisc = val;
 698                 retv = 0;
 699                 break;
 700         case IPV6_MTU:
 701                 if (optlen < sizeof(int))
 702                         goto e_inval;
 703                 if (val && val < IPV6_MIN_MTU)
 704                         goto e_inval;
 705                 np->frag_size = val;
 706                 retv = 0;
 707                 break;
 708         case IPV6_RECVERR:
 709                 if (optlen < sizeof(int))
 710                         goto e_inval;
 711                 np->recverr = valbool;
 712                 if (!val)
 713                         skb_queue_purge(&sk->sk_error_queue);
 714                 retv = 0;
 715                 break;
 716         case IPV6_FLOWINFO_SEND:
 717                 if (optlen < sizeof(int))
 718                         goto e_inval;
 719                 np->sndflow = valbool;
 720                 retv = 0;
 721                 break;
 722         case IPV6_FLOWLABEL_MGR:
 723                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 724                 break;
 725         case IPV6_IPSEC_POLICY:
 726         case IPV6_XFRM_POLICY:
 727                 retv = -EPERM;
 728                 if (!capable(CAP_NET_ADMIN))
 729                         break;
 730                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 731                 break;
 732
 733         case IPV6_ADDR_PREFERENCES:
 734             {
 735                 unsigned int pref = 0;
 736                 unsigned int prefmask = ~0;
 737
 738                 if (optlen < sizeof(int))
 739                         goto e_inval;
 740
 741                 retv = -EINVAL;
 742
 743                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 744                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 745                                IPV6_PREFER_SRC_TMP|
 746                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 747                 case IPV6_PREFER_SRC_PUBLIC:
 748                         pref |= IPV6_PREFER_SRC_PUBLIC;
 749                         break;
 750                 case IPV6_PREFER_SRC_TMP:
 751                         pref |= IPV6_PREFER_SRC_TMP;
 752                         break;
 753                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 754                         break;
 755                 case 0:
 756                         goto pref_skip_pubtmp;
 757                 default:
 758                         goto e_inval;
 759                 }
 760
 761                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 762                               IPV6_PREFER_SRC_TMP);
 763 pref_skip_pubtmp:
 764
 765                 /* check HOME/COA conflicts */
 766                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 767                 case IPV6_PREFER_SRC_HOME:
 768                         break;
 769                 case IPV6_PREFER_SRC_COA:
 770                         pref |= IPV6_PREFER_SRC_COA;
 771                 case 0:
 772                         goto pref_skip_coa;
 773                 default:
 774                         goto e_inval;
 775                 }
 776
 777                 prefmask &= ~IPV6_PREFER_SRC_COA;
 778 pref_skip_coa:
 779
 780                 /* check CGA/NONCGA conflicts */
 781                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 782                 case IPV6_PREFER_SRC_CGA:
 783                 case IPV6_PREFER_SRC_NONCGA:
 784                 case 0:
 785                         break;
 786                 default:
 787                         goto e_inval;
 788                 }
 789
 790                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 791                 retv = 0;
 792
 793                 break;
 794             }
 795         case IPV6_MINHOPCOUNT:
 796                 if (optlen < sizeof(int))
 797                         goto e_inval;
 798                 if (val < 0 || val > 255)
 799                         goto e_inval;
 800                 np->min_hopcount = val;
 801                 break;
 802         case IPV6_DONTFRAG:
 803                 np->dontfrag = valbool;
 804                 retv = 0;
 805                 break;
 806         }
 807
 808         release_sock(sk);
 809
 810         return retv;
 811
 812 e_inval:
 813         release_sock(sk);
 814         return -EINVAL;
 815 }
 816
 817 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 818                     char __user *optval, unsigned int optlen)
 819 {
 820         int err;
 821
 822         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 823                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 824
 825         if (level != SOL_IPV6)
 826                 return -ENOPROTOOPT;
 827
 828         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 829 #ifdef CONFIG_NETFILTER
 830         /* we need to exclude all possible ENOPROTOOPTs except default case */
 831         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 832                         optname != IPV6_XFRM_POLICY) {
 833                 lock_sock(sk);
 834                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 835                                 optlen);
 836                 release_sock(sk);
 837         }
 838 #endif
 839         return err;
 840 }
 841
 842 EXPORT_SYMBOL(ipv6_setsockopt);
 843
 844 #ifdef CONFIG_COMPAT
 845 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 846                            char __user *optval, unsigned int optlen)
 847 {
 848         int err;
 849
 850         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 851                 if (udp_prot.compat_setsockopt != NULL)
 852                         return udp_prot.compat_setsockopt(sk, level, optname,
 853                                                           optval, optlen);
 854                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 855         }
 856
 857         if (level != SOL_IPV6)
 858                 return -ENOPROTOOPT;
 859
 860         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 861                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 862                         ipv6_setsockopt);
 863
 864         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 865 #ifdef CONFIG_NETFILTER
 866         /* we need to exclude all possible ENOPROTOOPTs except default case */
 867         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 868             optname != IPV6_XFRM_POLICY) {
 869                 lock_sock(sk);
 870                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 871                                            optval, optlen);
 872                 release_sock(sk);
 873         }
 874 #endif
 875         return err;
 876 }
 877
 878 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 879 #endif
 880
 881 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 882                                   int optname, char __user *optval, int len)
 883 {
 884         struct ipv6_opt_hdr *hdr;
 885
 886         if (!opt)
 887                 return 0;
 888
 889         switch(optname) {
 890         case IPV6_HOPOPTS:
 891                 hdr = opt->hopopt;
 892                 break;
 893         case IPV6_RTHDRDSTOPTS:
 894                 hdr = opt->dst0opt;
 895                 break;
 896         case IPV6_RTHDR:
 897                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 898                 break;
 899         case IPV6_DSTOPTS:
 900                 hdr = opt->dst1opt;
 901                 break;
 902         default:
 903                 return -EINVAL; /* should not happen */
 904         }
 905
 906         if (!hdr)
 907                 return 0;
 908
 909         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 910         if (copy_to_user(optval, hdr, len))
 911                 return -EFAULT;
 912         return len;
 913 }
 914
 915 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 916                     char __user *optval, int __user *optlen)
 917 {
 918         struct ipv6_pinfo *np = inet6_sk(sk);
 919         int len;
 920         int val;
 921
 922         if (ip6_mroute_opt(optname))
 923                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 924
 925         if (get_user(len, optlen))
 926                 return -EFAULT;
 927         switch (optname) {
 928         case IPV6_ADDRFORM:
 929                 if (sk->sk_protocol != IPPROTO_UDP &&
 930                     sk->sk_protocol != IPPROTO_UDPLITE &&
 931                     sk->sk_protocol != IPPROTO_TCP)
 932                         return -ENOPROTOOPT;
 933                 if (sk->sk_state != TCP_ESTABLISHED)
 934                         return -ENOTCONN;
 935                 val = sk->sk_family;
 936                 break;
 937         case MCAST_MSFILTER:
 938         {
 939                 struct group_filter gsf;
 940                 int err;
 941
 942                 if (len < GROUP_FILTER_SIZE(0))
 943                         return -EINVAL;
 944                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 945                         return -EFAULT;
 946                 if (gsf.gf_group.ss_family != AF_INET6)
 947                         return -EADDRNOTAVAIL;
 948                 lock_sock(sk);
 949                 err = ip6_mc_msfget(sk, &gsf,
 950                         (struct group_filter __user *)optval, optlen);
 951                 release_sock(sk);
 952                 return err;
 953         }
 954
 955         case IPV6_2292PKTOPTIONS:
 956         {
 957                 struct msghdr msg;
 958                 struct sk_buff *skb;
 959
 960                 if (sk->sk_type != SOCK_STREAM)
 961                         return -ENOPROTOOPT;
 962
 963                 msg.msg_control = optval;
 964                 msg.msg_controllen = len;
 965                 msg.msg_flags = 0;
 966
 967                 lock_sock(sk);
 968                 skb = np->pktoptions;
 969                 if (skb)
 970                         atomic_inc(&skb->users);
 971                 release_sock(sk);
 972
 973                 if (skb) {
 974                         int err = datagram_recv_ctl(sk, &msg, skb);
 975                         kfree_skb(skb);
 976                         if (err)
 977                                 return err;
 978                 } else {
 979                         if (np->rxopt.bits.rxinfo) {
 980                                 struct in6_pktinfo src_info;
 981                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 982                                         np->sticky_pktinfo.ipi6_ifindex;
 983                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 984                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 985                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 986                         }
 987                         if (np->rxopt.bits.rxhlim) {
 988                                 int hlim = np->mcast_hops;
 989                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 990                         }
 991                         if (np->rxopt.bits.rxoinfo) {
 992                                 struct in6_pktinfo src_info;
 993                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 994                                         np->sticky_pktinfo.ipi6_ifindex;
 995                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 996                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 997                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 998                         }
 999                         if (np->rxopt.bits.rxohlim) {
1000                                 int hlim = np->mcast_hops;
1001                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1002                         }
1003                 }
1004                 len -= msg.msg_controllen;
1005                 return put_user(len, optlen);
1006         }
1007         case IPV6_MTU:
1008         {
1009                 struct dst_entry *dst;
1010
1011                 val = 0;
1012                 rcu_read_lock();
1013                 dst = __sk_dst_get(sk);
1014                 if (dst)
1015                         val = dst_mtu(dst);
1016                 rcu_read_unlock();
1017                 if (!val)
1018                         return -ENOTCONN;
1019                 break;
1020         }
1021
1022         case IPV6_V6ONLY:
1023                 val = np->ipv6only;
1024                 break;
1025
1026         case IPV6_RECVPKTINFO:
1027                 val = np->rxopt.bits.rxinfo;
1028                 break;
1029
1030         case IPV6_2292PKTINFO:
1031                 val = np->rxopt.bits.rxoinfo;
1032                 break;
1033
1034         case IPV6_RECVHOPLIMIT:
1035                 val = np->rxopt.bits.rxhlim;
1036                 break;
1037
1038         case IPV6_2292HOPLIMIT:
1039                 val = np->rxopt.bits.rxohlim;
1040                 break;
1041
1042         case IPV6_RECVRTHDR:
1043                 val = np->rxopt.bits.srcrt;
1044                 break;
1045
1046         case IPV6_2292RTHDR:
1047                 val = np->rxopt.bits.osrcrt;
1048                 break;
1049
1050         case IPV6_HOPOPTS:
1051         case IPV6_RTHDRDSTOPTS:
1052         case IPV6_RTHDR:
1053         case IPV6_DSTOPTS:
1054         {
1055
1056                 lock_sock(sk);
1057                 len = ipv6_getsockopt_sticky(sk, np->opt,
1058                                              optname, optval, len);
1059                 release_sock(sk);
1060                 /* check if ipv6_getsockopt_sticky() returns err code */
1061                 if (len < 0)
1062                         return len;
1063                 return put_user(len, optlen);
1064         }
1065
1066         case IPV6_RECVHOPOPTS:
1067                 val = np->rxopt.bits.hopopts;
1068                 break;
1069
1070         case IPV6_2292HOPOPTS:
1071                 val = np->rxopt.bits.ohopopts;
1072                 break;
1073
1074         case IPV6_RECVDSTOPTS:
1075                 val = np->rxopt.bits.dstopts;
1076                 break;
1077
1078         case IPV6_2292DSTOPTS:
1079                 val = np->rxopt.bits.odstopts;
1080                 break;
1081
1082         case IPV6_TCLASS:
1083                 val = np->tclass;
1084                 break;
1085
1086         case IPV6_RECVTCLASS:
1087                 val = np->rxopt.bits.rxtclass;
1088                 break;
1089
1090         case IPV6_FLOWINFO:
1091                 val = np->rxopt.bits.rxflow;
1092                 break;
1093
1094         case IPV6_RECVPATHMTU:
1095                 val = np->rxopt.bits.rxpmtu;
1096                 break;
1097
1098         case IPV6_PATHMTU:
1099         {
1100                 struct dst_entry *dst;
1101                 struct ip6_mtuinfo mtuinfo;
1102
1103                 if (len < sizeof(mtuinfo))
1104                         return -EINVAL;
1105
1106                 len = sizeof(mtuinfo);
1107                 memset(&mtuinfo, 0, sizeof(mtuinfo));
1108
1109                 rcu_read_lock();
1110                 dst = __sk_dst_get(sk);
1111                 if (dst)
1112                         mtuinfo.ip6m_mtu = dst_mtu(dst);
1113                 rcu_read_unlock();
1114                 if (!mtuinfo.ip6m_mtu)
1115                         return -ENOTCONN;
1116
1117                 if (put_user(len, optlen))
1118                         return -EFAULT;
1119                 if (copy_to_user(optval, &mtuinfo, len))
1120                         return -EFAULT;
1121
1122                 return 0;
1123                 break;
1124         }
1125
1126         case IPV6_TRANSPARENT:
1127                 val = inet_sk(sk)->transparent;
1128                 break;
1129
1130         case IPV6_RECVORIGDSTADDR:
1131                 val = np->rxopt.bits.rxorigdstaddr;
1132                 break;
1133
1134         case IPV6_UNICAST_HOPS:
1135         case IPV6_MULTICAST_HOPS:
1136         {
1137                 struct dst_entry *dst;
1138
1139                 if (optname == IPV6_UNICAST_HOPS)
1140                         val = np->hop_limit;
1141                 else
1142                         val = np->mcast_hops;
1143
1144                 if (val < 0) {
1145                         rcu_read_lock();
1146                         dst = __sk_dst_get(sk);
1147                         if (dst)
1148                                 val = ip6_dst_hoplimit(dst);
1149                         rcu_read_unlock();
1150                 }
1151
1152                 if (val < 0)
1153                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1154                 break;
1155         }
1156
1157         case IPV6_MULTICAST_LOOP:
1158                 val = np->mc_loop;
1159                 break;
1160
1161         case IPV6_MULTICAST_IF:
1162                 val = np->mcast_oif;
1163                 break;
1164
1165         case IPV6_MTU_DISCOVER:
1166                 val = np->pmtudisc;
1167                 break;
1168
1169         case IPV6_RECVERR:
1170                 val = np->recverr;
1171                 break;
1172
1173         case IPV6_FLOWINFO_SEND:
1174                 val = np->sndflow;
1175                 break;
1176
1177         case IPV6_ADDR_PREFERENCES:
1178                 val = 0;
1179
1180                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1181                         val |= IPV6_PREFER_SRC_TMP;
1182                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1183                         val |= IPV6_PREFER_SRC_PUBLIC;
1184                 else {
1185                         /* XXX: should we return system default? */
1186                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1187                 }
1188
1189                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1190                         val |= IPV6_PREFER_SRC_COA;
1191                 else
1192                         val |= IPV6_PREFER_SRC_HOME;
1193                 break;
1194
1195         case IPV6_MINHOPCOUNT:
1196                 val = np->min_hopcount;
1197                 break;
1198
1199         case IPV6_DONTFRAG:
1200                 val = np->dontfrag;
1201                 break;
1202
1203         default:
1204                 return -ENOPROTOOPT;
1205         }
1206         len = min_t(unsigned int, sizeof(int), len);
1207         if(put_user(len, optlen))
1208                 return -EFAULT;
1209         if(copy_to_user(optval,&val,len))
1210                 return -EFAULT;
1211         return 0;
1212 }
1213
1214 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1215                     char __user *optval, int __user *optlen)
1216 {
1217         int err;
1218
1219         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1220                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1221
1222         if(level != SOL_IPV6)
1223                 return -ENOPROTOOPT;
1224
1225         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1226 #ifdef CONFIG_NETFILTER
1227         /* we need to exclude all possible ENOPROTOOPTs except default case */
1228         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1229                 int len;
1230
1231                 if (get_user(len, optlen))
1232                         return -EFAULT;
1233
1234                 lock_sock(sk);
1235                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1236                                 &len);
1237                 release_sock(sk);
1238                 if (err >= 0)
1239                         err = put_user(len, optlen);
1240         }
1241 #endif
1242         return err;
1243 }
1244
1245 EXPORT_SYMBOL(ipv6_getsockopt);
1246
1247 #ifdef CONFIG_COMPAT
1248 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1249                            char __user *optval, int __user *optlen)
1250 {
1251         int err;
1252
1253         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1254                 if (udp_prot.compat_getsockopt != NULL)
1255                         return udp_prot.compat_getsockopt(sk, level, optname,
1256                                                           optval, optlen);
1257                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1258         }
1259
1260         if (level != SOL_IPV6)
1261                 return -ENOPROTOOPT;
1262
1263         if (optname == MCAST_MSFILTER)
1264                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1265                         ipv6_getsockopt);
1266
1267         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1268 #ifdef CONFIG_NETFILTER
1269         /* we need to exclude all possible ENOPROTOOPTs except default case */
1270         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1271                 int len;
1272
1273                 if (get_user(len, optlen))
1274                         return -EFAULT;
1275
1276                 lock_sock(sk);
1277                 err = compat_nf_getsockopt(sk, PF_INET6,
1278                                            optname, optval, &len);
1279                 release_sock(sk);
1280                 if (err >= 0)
1281                         err = put_user(len, optlen);
1282         }
1283 #endif
1284         return err;
1285 }
1286
1287 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1288 #endif
1289