net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <[email protected]>
   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 <[email protected]>:
  22  *              - added multicast source filtering API for MLDv2
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/capability.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/socket.h>
  30 #include <linux/sockios.h>
  31 #include <linux/net.h>
  32 #include <linux/in6.h>
  33 #include <linux/mroute6.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/init.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/netfilter.h>
  39
  40 #include <net/sock.h>
  41 #include <net/snmp.h>
  42 #include <net/ipv6.h>
  43 #include <net/ndisc.h>
  44 #include <net/protocol.h>
  45 #include <net/transp_v6.h>
  46 #include <net/ip6_route.h>
  47 #include <net/addrconf.h>
  48 #include <net/inet_common.h>
  49 #include <net/tcp.h>
  50 #include <net/udp.h>
  51 #include <net/udplite.h>
  52 #include <net/xfrm.h>
  53 #include <net/compat.h>
  54
  55 #include <asm/uaccess.h>
  56
  57 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  58
  59 struct ip6_ra_chain *ip6_ra_chain;
  60 DEFINE_RWLOCK(ip6_ra_lock);
  61
  62 int ip6_ra_control(struct sock *sk, int sel)
  63 {
  64         struct ip6_ra_chain *ra, *new_ra, **rap;
  65
  66         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  67         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  68                 return -ENOPROTOOPT;
  69
  70         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  71
  72         write_lock_bh(&ip6_ra_lock);
  73         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  74                 if (ra->sk == sk) {
  75                         if (sel>=0) {
  76                                 write_unlock_bh(&ip6_ra_lock);
  77                                 kfree(new_ra);
  78                                 return -EADDRINUSE;
  79                         }
  80
  81                         *rap = ra->next;
  82                         write_unlock_bh(&ip6_ra_lock);
  83
  84                         sock_put(sk);
  85                         kfree(ra);
  86                         return 0;
  87                 }
  88         }
  89         if (new_ra == NULL) {
  90                 write_unlock_bh(&ip6_ra_lock);
  91                 return -ENOBUFS;
  92         }
  93         new_ra->sk = sk;
  94         new_ra->sel = sel;
  95         new_ra->next = ra;
  96         *rap = new_ra;
  97         sock_hold(sk);
  98         write_unlock_bh(&ip6_ra_lock);
  99         return 0;
 100 }
 101
 102 static
 103 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 104                                            struct ipv6_txoptions *opt)
 105 {
 106         if (inet_sk(sk)->is_icsk) {
 107                 if (opt &&
 108                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 109                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 110                         struct inet_connection_sock *icsk = inet_csk(sk);
 111                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 112                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 113                 }
 114                 opt = xchg(&inet6_sk(sk)->opt, opt);
 115         } else {
 116                 write_lock(&sk->sk_dst_lock);
 117                 opt = xchg(&inet6_sk(sk)->opt, opt);
 118                 write_unlock(&sk->sk_dst_lock);
 119         }
 120         sk_dst_reset(sk);
 121
 122         return opt;
 123 }
 124
 125 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 126                     char __user *optval, unsigned int optlen)
 127 {
 128         struct ipv6_pinfo *np = inet6_sk(sk);
 129         struct net *net = sock_net(sk);
 130         int val, valbool;
 131         int retv = -ENOPROTOOPT;
 132
 133         if (optval == NULL)
 134                 val=0;
 135         else {
 136                 if (optlen >= sizeof(int)) {
 137                         if (get_user(val, (int __user *) optval))
 138                                 return -EFAULT;
 139                 } else
 140                         val = 0;
 141         }
 142
 143         valbool = (val!=0);
 144
 145         if (ip6_mroute_opt(optname))
 146                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 147
 148         lock_sock(sk);
 149
 150         switch (optname) {
 151
 152         case IPV6_ADDRFORM:
 153                 if (optlen < sizeof(int))
 154                         goto e_inval;
 155                 if (val == PF_INET) {
 156                         struct ipv6_txoptions *opt;
 157                         struct sk_buff *pktopt;
 158
 159                         if (sk->sk_type == SOCK_RAW)
 160                                 break;
 161
 162                         if (sk->sk_protocol == IPPROTO_UDP ||
 163                             sk->sk_protocol == IPPROTO_UDPLITE) {
 164                                 struct udp_sock *up = udp_sk(sk);
 165                                 if (up->pending == AF_INET6) {
 166                                         retv = -EBUSY;
 167                                         break;
 168                                 }
 169                         } else if (sk->sk_protocol != IPPROTO_TCP)
 170                                 break;
 171
 172                         if (sk->sk_state != TCP_ESTABLISHED) {
 173                                 retv = -ENOTCONN;
 174                                 break;
 175                         }
 176
 177                         if (ipv6_only_sock(sk) ||
 178                             !ipv6_addr_v4mapped(&np->daddr)) {
 179                                 retv = -EADDRNOTAVAIL;
 180                                 break;
 181                         }
 182
 183                         fl6_free_socklist(sk);
 184                         ipv6_sock_mc_close(sk);
 185
 186                         /*
 187                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 188                          * remove it from the refcnt debug socks count in the
 189                          * original family...
 190                          */
 191                         sk_refcnt_debug_dec(sk);
 192
 193                         if (sk->sk_protocol == IPPROTO_TCP) {
 194                                 struct inet_connection_sock *icsk = inet_csk(sk);
 195                                 local_bh_disable();
 196                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 197                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 198                                 local_bh_enable();
 199                                 sk->sk_prot = &tcp_prot;
 200                                 icsk->icsk_af_ops = &ipv4_specific;
 201                                 sk->sk_socket->ops = &inet_stream_ops;
 202                                 sk->sk_family = PF_INET;
 203                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 204                         } else {
 205                                 struct proto *prot = &udp_prot;
 206
 207                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 208                                         prot = &udplite_prot;
 209                                 local_bh_disable();
 210                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 211                                 sock_prot_inuse_add(net, prot, 1);
 212                                 local_bh_enable();
 213                                 sk->sk_prot = prot;
 214                                 sk->sk_socket->ops = &inet_dgram_ops;
 215                                 sk->sk_family = PF_INET;
 216                         }
 217                         opt = xchg(&np->opt, NULL);
 218                         if (opt)
 219                                 sock_kfree_s(sk, opt, opt->tot_len);
 220                         pktopt = xchg(&np->pktoptions, NULL);
 221                         kfree_skb(pktopt);
 222
 223                         sk->sk_destruct = inet_sock_destruct;
 224                         /*
 225                          * ... and add it to the refcnt debug socks count
 226                          * in the new family. -acme
 227                          */
 228                         sk_refcnt_debug_inc(sk);
 229                         module_put(THIS_MODULE);
 230                         retv = 0;
 231                         break;
 232                 }
 233                 goto e_inval;
 234
 235         case IPV6_V6ONLY:
 236                 if (optlen < sizeof(int) ||
 237                     inet_sk(sk)->inet_num)
 238                         goto e_inval;
 239                 np->ipv6only = valbool;
 240                 retv = 0;
 241                 break;
 242
 243         case IPV6_RECVPKTINFO:
 244                 if (optlen < sizeof(int))
 245                         goto e_inval;
 246                 np->rxopt.bits.rxinfo = valbool;
 247                 retv = 0;
 248                 break;
 249
 250         case IPV6_2292PKTINFO:
 251                 if (optlen < sizeof(int))
 252                         goto e_inval;
 253                 np->rxopt.bits.rxoinfo = valbool;
 254                 retv = 0;
 255                 break;
 256
 257         case IPV6_RECVHOPLIMIT:
 258                 if (optlen < sizeof(int))
 259                         goto e_inval;
 260                 np->rxopt.bits.rxhlim = valbool;
 261                 retv = 0;
 262                 break;
 263
 264         case IPV6_2292HOPLIMIT:
 265                 if (optlen < sizeof(int))
 266                         goto e_inval;
 267                 np->rxopt.bits.rxohlim = valbool;
 268                 retv = 0;
 269                 break;
 270
 271         case IPV6_RECVRTHDR:
 272                 if (optlen < sizeof(int))
 273                         goto e_inval;
 274                 np->rxopt.bits.srcrt = valbool;
 275                 retv = 0;
 276                 break;
 277
 278         case IPV6_2292RTHDR:
 279                 if (optlen < sizeof(int))
 280                         goto e_inval;
 281                 np->rxopt.bits.osrcrt = valbool;
 282                 retv = 0;
 283                 break;
 284
 285         case IPV6_RECVHOPOPTS:
 286                 if (optlen < sizeof(int))
 287                         goto e_inval;
 288                 np->rxopt.bits.hopopts = valbool;
 289                 retv = 0;
 290                 break;
 291
 292         case IPV6_2292HOPOPTS:
 293                 if (optlen < sizeof(int))
 294                         goto e_inval;
 295                 np->rxopt.bits.ohopopts = valbool;
 296                 retv = 0;
 297                 break;
 298
 299         case IPV6_RECVDSTOPTS:
 300                 if (optlen < sizeof(int))
 301                         goto e_inval;
 302                 np->rxopt.bits.dstopts = valbool;
 303                 retv = 0;
 304                 break;
 305
 306         case IPV6_2292DSTOPTS:
 307                 if (optlen < sizeof(int))
 308                         goto e_inval;
 309                 np->rxopt.bits.odstopts = valbool;
 310                 retv = 0;
 311                 break;
 312
 313         case IPV6_TCLASS:
 314                 if (optlen < sizeof(int))
 315                         goto e_inval;
 316                 if (val < -1 || val > 0xff)
 317                         goto e_inval;
 318                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 319                 if (val == -1)
 320                         val = 0;
 321                 np->tclass = val;
 322                 retv = 0;
 323                 break;
 324
 325         case IPV6_RECVTCLASS:
 326                 if (optlen < sizeof(int))
 327                         goto e_inval;
 328                 np->rxopt.bits.rxtclass = valbool;
 329                 retv = 0;
 330                 break;
 331
 332         case IPV6_FLOWINFO:
 333                 if (optlen < sizeof(int))
 334                         goto e_inval;
 335                 np->rxopt.bits.rxflow = valbool;
 336                 retv = 0;
 337                 break;
 338
 339         case IPV6_HOPOPTS:
 340         case IPV6_RTHDRDSTOPTS:
 341         case IPV6_RTHDR:
 342         case IPV6_DSTOPTS:
 343         {
 344                 struct ipv6_txoptions *opt;
 345
 346                 /* remove any sticky options header with a zero option
 347                  * length, per RFC3542.
 348                  */
 349                 if (optlen == 0)
 350                         optval = NULL;
 351                 else if (optval == NULL)
 352                         goto e_inval;
 353                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 354                          optlen & 0x7 || optlen > 8 * 255)
 355                         goto e_inval;
 356
 357                 /* hop-by-hop / destination options are privileged option */
 358                 retv = -EPERM;
 359                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 360                         break;
 361
 362                 opt = ipv6_renew_options(sk, np->opt, optname,
 363                                          (struct ipv6_opt_hdr __user *)optval,
 364                                          optlen);
 365                 if (IS_ERR(opt)) {
 366                         retv = PTR_ERR(opt);
 367                         break;
 368                 }
 369
 370                 /* routing header option needs extra check */
 371                 retv = -EINVAL;
 372                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 373                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 374                         switch (rthdr->type) {
 375 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 376                         case IPV6_SRCRT_TYPE_2:
 377                                 if (rthdr->hdrlen != 2 ||
 378                                     rthdr->segments_left != 1)
 379                                         goto sticky_done;
 380
 381                                 break;
 382 #endif
 383                         default:
 384                                 goto sticky_done;
 385                         }
 386                 }
 387
 388                 retv = 0;
 389                 opt = ipv6_update_options(sk, opt);
 390 sticky_done:
 391                 if (opt)
 392                         sock_kfree_s(sk, opt, opt->tot_len);
 393                 break;
 394         }
 395
 396         case IPV6_PKTINFO:
 397         {
 398                 struct in6_pktinfo pkt;
 399
 400                 if (optlen == 0)
 401                         goto e_inval;
 402                 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
 403                         goto e_inval;
 404
 405                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 406                                 retv = -EFAULT;
 407                                 break;
 408                 }
 409                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 410                         goto e_inval;
 411
 412                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 413                 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
 414                 retv = 0;
 415                 break;
 416         }
 417
 418         case IPV6_2292PKTOPTIONS:
 419         {
 420                 struct ipv6_txoptions *opt = NULL;
 421                 struct msghdr msg;
 422                 struct flowi fl;
 423                 int junk;
 424
 425                 fl.fl6_flowlabel = 0;
 426                 fl.oif = sk->sk_bound_dev_if;
 427                 fl.mark = sk->sk_mark;
 428
 429                 if (optlen == 0)
 430                         goto update;
 431
 432                 /* 1K is probably excessive
 433                  * 1K is surely not enough, 2K per standard header is 16K.
 434                  */
 435                 retv = -EINVAL;
 436                 if (optlen > 64*1024)
 437                         break;
 438
 439                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 440                 retv = -ENOBUFS;
 441                 if (opt == NULL)
 442                         break;
 443
 444                 memset(opt, 0, sizeof(*opt));
 445                 opt->tot_len = sizeof(*opt) + optlen;
 446                 retv = -EFAULT;
 447                 if (copy_from_user(opt+1, optval, optlen))
 448                         goto done;
 449
 450                 msg.msg_controllen = optlen;
 451                 msg.msg_control = (void*)(opt+1);
 452
 453                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
 454                 if (retv)
 455                         goto done;
 456 update:
 457                 retv = 0;
 458                 opt = ipv6_update_options(sk, opt);
 459 done:
 460                 if (opt)
 461                         sock_kfree_s(sk, opt, opt->tot_len);
 462                 break;
 463         }
 464         case IPV6_UNICAST_HOPS:
 465                 if (optlen < sizeof(int))
 466                         goto e_inval;
 467                 if (val > 255 || val < -1)
 468                         goto e_inval;
 469                 np->hop_limit = val;
 470                 retv = 0;
 471                 break;
 472
 473         case IPV6_MULTICAST_HOPS:
 474                 if (sk->sk_type == SOCK_STREAM)
 475                         break;
 476                 if (optlen < sizeof(int))
 477                         goto e_inval;
 478                 if (val > 255 || val < -1)
 479                         goto e_inval;
 480                 np->mcast_hops = val;
 481                 retv = 0;
 482                 break;
 483
 484         case IPV6_MULTICAST_LOOP:
 485                 if (optlen < sizeof(int))
 486                         goto e_inval;
 487                 if (val != valbool)
 488                         goto e_inval;
 489                 np->mc_loop = valbool;
 490                 retv = 0;
 491                 break;
 492
 493         case IPV6_MULTICAST_IF:
 494                 if (sk->sk_type == SOCK_STREAM)
 495                         break;
 496                 if (optlen < sizeof(int))
 497                         goto e_inval;
 498
 499                 if (val) {
 500                         struct net_device *dev;
 501
 502                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 503                                 goto e_inval;
 504
 505                         dev = dev_get_by_index(net, val);
 506                         if (!dev) {
 507                                 retv = -ENODEV;
 508                                 break;
 509                         }
 510                         dev_put(dev);
 511                 }
 512                 np->mcast_oif = val;
 513                 retv = 0;
 514                 break;
 515         case IPV6_ADD_MEMBERSHIP:
 516         case IPV6_DROP_MEMBERSHIP:
 517         {
 518                 struct ipv6_mreq mreq;
 519
 520                 if (optlen < sizeof(struct ipv6_mreq))
 521                         goto e_inval;
 522
 523                 retv = -EPROTO;
 524                 if (inet_sk(sk)->is_icsk)
 525                         break;
 526
 527                 retv = -EFAULT;
 528                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 529                         break;
 530
 531                 if (optname == IPV6_ADD_MEMBERSHIP)
 532                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 533                 else
 534                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 535                 break;
 536         }
 537         case IPV6_JOIN_ANYCAST:
 538         case IPV6_LEAVE_ANYCAST:
 539         {
 540                 struct ipv6_mreq mreq;
 541
 542                 if (optlen < sizeof(struct ipv6_mreq))
 543                         goto e_inval;
 544
 545                 retv = -EFAULT;
 546                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 547                         break;
 548
 549                 if (optname == IPV6_JOIN_ANYCAST)
 550                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 551                 else
 552                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 553                 break;
 554         }
 555         case MCAST_JOIN_GROUP:
 556         case MCAST_LEAVE_GROUP:
 557         {
 558                 struct group_req greq;
 559                 struct sockaddr_in6 *psin6;
 560
 561                 if (optlen < sizeof(struct group_req))
 562                         goto e_inval;
 563
 564                 retv = -EFAULT;
 565                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 566                         break;
 567                 if (greq.gr_group.ss_family != AF_INET6) {
 568                         retv = -EADDRNOTAVAIL;
 569                         break;
 570                 }
 571                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 572                 if (optname == MCAST_JOIN_GROUP)
 573                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 574                                 &psin6->sin6_addr);
 575                 else
 576                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 577                                 &psin6->sin6_addr);
 578                 break;
 579         }
 580         case MCAST_JOIN_SOURCE_GROUP:
 581         case MCAST_LEAVE_SOURCE_GROUP:
 582         case MCAST_BLOCK_SOURCE:
 583         case MCAST_UNBLOCK_SOURCE:
 584         {
 585                 struct group_source_req greqs;
 586                 int omode, add;
 587
 588                 if (optlen < sizeof(struct group_source_req))
 589                         goto e_inval;
 590                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 591                         retv = -EFAULT;
 592                         break;
 593                 }
 594                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 595                     greqs.gsr_source.ss_family != AF_INET6) {
 596                         retv = -EADDRNOTAVAIL;
 597                         break;
 598                 }
 599                 if (optname == MCAST_BLOCK_SOURCE) {
 600                         omode = MCAST_EXCLUDE;
 601                         add = 1;
 602                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 603                         omode = MCAST_EXCLUDE;
 604                         add = 0;
 605                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 606                         struct sockaddr_in6 *psin6;
 607
 608                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 609                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 610                                 &psin6->sin6_addr);
 611                         /* prior join w/ different source is ok */
 612                         if (retv && retv != -EADDRINUSE)
 613                                 break;
 614                         omode = MCAST_INCLUDE;
 615                         add = 1;
 616                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 617                         omode = MCAST_INCLUDE;
 618                         add = 0;
 619                 }
 620                 retv = ip6_mc_source(add, omode, sk, &greqs);
 621                 break;
 622         }
 623         case MCAST_MSFILTER:
 624         {
 625                 extern int sysctl_mld_max_msf;
 626                 struct group_filter *gsf;
 627
 628                 if (optlen < GROUP_FILTER_SIZE(0))
 629                         goto e_inval;
 630                 if (optlen > sysctl_optmem_max) {
 631                         retv = -ENOBUFS;
 632                         break;
 633                 }
 634                 gsf = kmalloc(optlen,GFP_KERNEL);
 635                 if (!gsf) {
 636                         retv = -ENOBUFS;
 637                         break;
 638                 }
 639                 retv = -EFAULT;
 640                 if (copy_from_user(gsf, optval, optlen)) {
 641                         kfree(gsf);
 642                         break;
 643                 }
 644                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 645                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 646                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 647                         kfree(gsf);
 648                         retv = -ENOBUFS;
 649                         break;
 650                 }
 651                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 652                         kfree(gsf);
 653                         retv = -EINVAL;
 654                         break;
 655                 }
 656                 retv = ip6_mc_msfilter(sk, gsf);
 657                 kfree(gsf);
 658
 659                 break;
 660         }
 661         case IPV6_ROUTER_ALERT:
 662                 if (optlen < sizeof(int))
 663                         goto e_inval;
 664                 retv = ip6_ra_control(sk, val);
 665                 break;
 666         case IPV6_MTU_DISCOVER:
 667                 if (optlen < sizeof(int))
 668                         goto e_inval;
 669                 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
 670                         goto e_inval;
 671                 np->pmtudisc = val;
 672                 retv = 0;
 673                 break;
 674         case IPV6_MTU:
 675                 if (optlen < sizeof(int))
 676                         goto e_inval;
 677                 if (val && val < IPV6_MIN_MTU)
 678                         goto e_inval;
 679                 np->frag_size = val;
 680                 retv = 0;
 681                 break;
 682         case IPV6_RECVERR:
 683                 if (optlen < sizeof(int))
 684                         goto e_inval;
 685                 np->recverr = valbool;
 686                 if (!val)
 687                         skb_queue_purge(&sk->sk_error_queue);
 688                 retv = 0;
 689                 break;
 690         case IPV6_FLOWINFO_SEND:
 691                 if (optlen < sizeof(int))
 692                         goto e_inval;
 693                 np->sndflow = valbool;
 694                 retv = 0;
 695                 break;
 696         case IPV6_FLOWLABEL_MGR:
 697                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 698                 break;
 699         case IPV6_IPSEC_POLICY:
 700         case IPV6_XFRM_POLICY:
 701                 retv = -EPERM;
 702                 if (!capable(CAP_NET_ADMIN))
 703                         break;
 704                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 705                 break;
 706
 707         case IPV6_ADDR_PREFERENCES:
 708             {
 709                 unsigned int pref = 0;
 710                 unsigned int prefmask = ~0;
 711
 712                 if (optlen < sizeof(int))
 713                         goto e_inval;
 714
 715                 retv = -EINVAL;
 716
 717                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 718                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 719                                IPV6_PREFER_SRC_TMP|
 720                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 721                 case IPV6_PREFER_SRC_PUBLIC:
 722                         pref |= IPV6_PREFER_SRC_PUBLIC;
 723                         break;
 724                 case IPV6_PREFER_SRC_TMP:
 725                         pref |= IPV6_PREFER_SRC_TMP;
 726                         break;
 727                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 728                         break;
 729                 case 0:
 730                         goto pref_skip_pubtmp;
 731                 default:
 732                         goto e_inval;
 733                 }
 734
 735                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 736                               IPV6_PREFER_SRC_TMP);
 737 pref_skip_pubtmp:
 738
 739                 /* check HOME/COA conflicts */
 740                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 741                 case IPV6_PREFER_SRC_HOME:
 742                         break;
 743                 case IPV6_PREFER_SRC_COA:
 744                         pref |= IPV6_PREFER_SRC_COA;
 745                 case 0:
 746                         goto pref_skip_coa;
 747                 default:
 748                         goto e_inval;
 749                 }
 750
 751                 prefmask &= ~IPV6_PREFER_SRC_COA;
 752 pref_skip_coa:
 753
 754                 /* check CGA/NONCGA conflicts */
 755                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 756                 case IPV6_PREFER_SRC_CGA:
 757                 case IPV6_PREFER_SRC_NONCGA:
 758                 case 0:
 759                         break;
 760                 default:
 761                         goto e_inval;
 762                 }
 763
 764                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 765                 retv = 0;
 766
 767                 break;
 768             }
 769         }
 770
 771         release_sock(sk);
 772
 773         return retv;
 774
 775 e_inval:
 776         release_sock(sk);
 777         return -EINVAL;
 778 }
 779
 780 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 781                     char __user *optval, unsigned int optlen)
 782 {
 783         int err;
 784
 785         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 786                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 787
 788         if (level != SOL_IPV6)
 789                 return -ENOPROTOOPT;
 790
 791         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 792 #ifdef CONFIG_NETFILTER
 793         /* we need to exclude all possible ENOPROTOOPTs except default case */
 794         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 795                         optname != IPV6_XFRM_POLICY) {
 796                 lock_sock(sk);
 797                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 798                                 optlen);
 799                 release_sock(sk);
 800         }
 801 #endif
 802         return err;
 803 }
 804
 805 EXPORT_SYMBOL(ipv6_setsockopt);
 806
 807 #ifdef CONFIG_COMPAT
 808 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 809                            char __user *optval, unsigned int optlen)
 810 {
 811         int err;
 812
 813         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 814                 if (udp_prot.compat_setsockopt != NULL)
 815                         return udp_prot.compat_setsockopt(sk, level, optname,
 816                                                           optval, optlen);
 817                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 818         }
 819
 820         if (level != SOL_IPV6)
 821                 return -ENOPROTOOPT;
 822
 823         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 824                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 825                         ipv6_setsockopt);
 826
 827         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 828 #ifdef CONFIG_NETFILTER
 829         /* we need to exclude all possible ENOPROTOOPTs except default case */
 830         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 831             optname != IPV6_XFRM_POLICY) {
 832                 lock_sock(sk);
 833                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 834                                            optval, optlen);
 835                 release_sock(sk);
 836         }
 837 #endif
 838         return err;
 839 }
 840
 841 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 842 #endif
 843
 844 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 845                                   int optname, char __user *optval, int len)
 846 {
 847         struct ipv6_opt_hdr *hdr;
 848
 849         if (!opt)
 850                 return 0;
 851
 852         switch(optname) {
 853         case IPV6_HOPOPTS:
 854                 hdr = opt->hopopt;
 855                 break;
 856         case IPV6_RTHDRDSTOPTS:
 857                 hdr = opt->dst0opt;
 858                 break;
 859         case IPV6_RTHDR:
 860                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 861                 break;
 862         case IPV6_DSTOPTS:
 863                 hdr = opt->dst1opt;
 864                 break;
 865         default:
 866                 return -EINVAL; /* should not happen */
 867         }
 868
 869         if (!hdr)
 870                 return 0;
 871
 872         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 873         if (copy_to_user(optval, hdr, len))
 874                 return -EFAULT;
 875         return len;
 876 }
 877
 878 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 879                     char __user *optval, int __user *optlen)
 880 {
 881         struct ipv6_pinfo *np = inet6_sk(sk);
 882         int len;
 883         int val;
 884
 885         if (ip6_mroute_opt(optname))
 886                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 887
 888         if (get_user(len, optlen))
 889                 return -EFAULT;
 890         switch (optname) {
 891         case IPV6_ADDRFORM:
 892                 if (sk->sk_protocol != IPPROTO_UDP &&
 893                     sk->sk_protocol != IPPROTO_UDPLITE &&
 894                     sk->sk_protocol != IPPROTO_TCP)
 895                         return -ENOPROTOOPT;
 896                 if (sk->sk_state != TCP_ESTABLISHED)
 897                         return -ENOTCONN;
 898                 val = sk->sk_family;
 899                 break;
 900         case MCAST_MSFILTER:
 901         {
 902                 struct group_filter gsf;
 903                 int err;
 904
 905                 if (len < GROUP_FILTER_SIZE(0))
 906                         return -EINVAL;
 907                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 908                         return -EFAULT;
 909                 if (gsf.gf_group.ss_family != AF_INET6)
 910                         return -EADDRNOTAVAIL;
 911                 lock_sock(sk);
 912                 err = ip6_mc_msfget(sk, &gsf,
 913                         (struct group_filter __user *)optval, optlen);
 914                 release_sock(sk);
 915                 return err;
 916         }
 917
 918         case IPV6_2292PKTOPTIONS:
 919         {
 920                 struct msghdr msg;
 921                 struct sk_buff *skb;
 922
 923                 if (sk->sk_type != SOCK_STREAM)
 924                         return -ENOPROTOOPT;
 925
 926                 msg.msg_control = optval;
 927                 msg.msg_controllen = len;
 928                 msg.msg_flags = 0;
 929
 930                 lock_sock(sk);
 931                 skb = np->pktoptions;
 932                 if (skb)
 933                         atomic_inc(&skb->users);
 934                 release_sock(sk);
 935
 936                 if (skb) {
 937                         int err = datagram_recv_ctl(sk, &msg, skb);
 938                         kfree_skb(skb);
 939                         if (err)
 940                                 return err;
 941                 } else {
 942                         if (np->rxopt.bits.rxinfo) {
 943                                 struct in6_pktinfo src_info;
 944                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 945                                         np->sticky_pktinfo.ipi6_ifindex;
 946                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 947                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 948                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 949                         }
 950                         if (np->rxopt.bits.rxhlim) {
 951                                 int hlim = np->mcast_hops;
 952                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 953                         }
 954                         if (np->rxopt.bits.rxoinfo) {
 955                                 struct in6_pktinfo src_info;
 956                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 957                                         np->sticky_pktinfo.ipi6_ifindex;
 958                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 959                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 960                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 961                         }
 962                         if (np->rxopt.bits.rxohlim) {
 963                                 int hlim = np->mcast_hops;
 964                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 965                         }
 966                 }
 967                 len -= msg.msg_controllen;
 968                 return put_user(len, optlen);
 969         }
 970         case IPV6_MTU:
 971         {
 972                 struct dst_entry *dst;
 973                 val = 0;
 974                 lock_sock(sk);
 975                 dst = sk_dst_get(sk);
 976                 if (dst) {
 977                         val = dst_mtu(dst);
 978                         dst_release(dst);
 979                 }
 980                 release_sock(sk);
 981                 if (!val)
 982                         return -ENOTCONN;
 983                 break;
 984         }
 985
 986         case IPV6_V6ONLY:
 987                 val = np->ipv6only;
 988                 break;
 989
 990         case IPV6_RECVPKTINFO:
 991                 val = np->rxopt.bits.rxinfo;
 992                 break;
 993
 994         case IPV6_2292PKTINFO:
 995                 val = np->rxopt.bits.rxoinfo;
 996                 break;
 997
 998         case IPV6_RECVHOPLIMIT:
 999                 val = np->rxopt.bits.rxhlim;
1000                 break;
1001
1002         case IPV6_2292HOPLIMIT:
1003                 val = np->rxopt.bits.rxohlim;
1004                 break;
1005
1006         case IPV6_RECVRTHDR:
1007                 val = np->rxopt.bits.srcrt;
1008                 break;
1009
1010         case IPV6_2292RTHDR:
1011                 val = np->rxopt.bits.osrcrt;
1012                 break;
1013
1014         case IPV6_HOPOPTS:
1015         case IPV6_RTHDRDSTOPTS:
1016         case IPV6_RTHDR:
1017         case IPV6_DSTOPTS:
1018         {
1019
1020                 lock_sock(sk);
1021                 len = ipv6_getsockopt_sticky(sk, np->opt,
1022                                              optname, optval, len);
1023                 release_sock(sk);
1024                 /* check if ipv6_getsockopt_sticky() returns err code */
1025                 if (len < 0)
1026                         return len;
1027                 return put_user(len, optlen);
1028         }
1029
1030         case IPV6_RECVHOPOPTS:
1031                 val = np->rxopt.bits.hopopts;
1032                 break;
1033
1034         case IPV6_2292HOPOPTS:
1035                 val = np->rxopt.bits.ohopopts;
1036                 break;
1037
1038         case IPV6_RECVDSTOPTS:
1039                 val = np->rxopt.bits.dstopts;
1040                 break;
1041
1042         case IPV6_2292DSTOPTS:
1043                 val = np->rxopt.bits.odstopts;
1044                 break;
1045
1046         case IPV6_TCLASS:
1047                 val = np->tclass;
1048                 break;
1049
1050         case IPV6_RECVTCLASS:
1051                 val = np->rxopt.bits.rxtclass;
1052                 break;
1053
1054         case IPV6_FLOWINFO:
1055                 val = np->rxopt.bits.rxflow;
1056                 break;
1057
1058         case IPV6_UNICAST_HOPS:
1059         case IPV6_MULTICAST_HOPS:
1060         {
1061                 struct dst_entry *dst;
1062
1063                 if (optname == IPV6_UNICAST_HOPS)
1064                         val = np->hop_limit;
1065                 else
1066                         val = np->mcast_hops;
1067
1068                 dst = sk_dst_get(sk);
1069                 if (dst) {
1070                         if (val < 0)
1071                                 val = ip6_dst_hoplimit(dst);
1072                         dst_release(dst);
1073                 }
1074                 if (val < 0)
1075                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1076                 break;
1077         }
1078
1079         case IPV6_MULTICAST_LOOP:
1080                 val = np->mc_loop;
1081                 break;
1082
1083         case IPV6_MULTICAST_IF:
1084                 val = np->mcast_oif;
1085                 break;
1086
1087         case IPV6_MTU_DISCOVER:
1088                 val = np->pmtudisc;
1089                 break;
1090
1091         case IPV6_RECVERR:
1092                 val = np->recverr;
1093                 break;
1094
1095         case IPV6_FLOWINFO_SEND:
1096                 val = np->sndflow;
1097                 break;
1098
1099         case IPV6_ADDR_PREFERENCES:
1100                 val = 0;
1101
1102                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1103                         val |= IPV6_PREFER_SRC_TMP;
1104                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1105                         val |= IPV6_PREFER_SRC_PUBLIC;
1106                 else {
1107                         /* XXX: should we return system default? */
1108                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1109                 }
1110
1111                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1112                         val |= IPV6_PREFER_SRC_COA;
1113                 else
1114                         val |= IPV6_PREFER_SRC_HOME;
1115                 break;
1116
1117         default:
1118                 return -ENOPROTOOPT;
1119         }
1120         len = min_t(unsigned int, sizeof(int), len);
1121         if(put_user(len, optlen))
1122                 return -EFAULT;
1123         if(copy_to_user(optval,&val,len))
1124                 return -EFAULT;
1125         return 0;
1126 }
1127
1128 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1129                     char __user *optval, int __user *optlen)
1130 {
1131         int err;
1132
1133         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1134                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1135
1136         if(level != SOL_IPV6)
1137                 return -ENOPROTOOPT;
1138
1139         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1140 #ifdef CONFIG_NETFILTER
1141         /* we need to exclude all possible ENOPROTOOPTs except default case */
1142         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1143                 int len;
1144
1145                 if (get_user(len, optlen))
1146                         return -EFAULT;
1147
1148                 lock_sock(sk);
1149                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1150                                 &len);
1151                 release_sock(sk);
1152                 if (err >= 0)
1153                         err = put_user(len, optlen);
1154         }
1155 #endif
1156         return err;
1157 }
1158
1159 EXPORT_SYMBOL(ipv6_getsockopt);
1160
1161 #ifdef CONFIG_COMPAT
1162 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1163                            char __user *optval, int __user *optlen)
1164 {
1165         int err;
1166
1167         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1168                 if (udp_prot.compat_getsockopt != NULL)
1169                         return udp_prot.compat_getsockopt(sk, level, optname,
1170                                                           optval, optlen);
1171                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1172         }
1173
1174         if (level != SOL_IPV6)
1175                 return -ENOPROTOOPT;
1176
1177         if (optname == MCAST_MSFILTER)
1178                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1179                         ipv6_getsockopt);
1180
1181         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1182 #ifdef CONFIG_NETFILTER
1183         /* we need to exclude all possible ENOPROTOOPTs except default case */
1184         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1185                 int len;
1186
1187                 if (get_user(len, optlen))
1188                         return -EFAULT;
1189
1190                 lock_sock(sk);
1191                 err = compat_nf_getsockopt(sk, PF_INET6,
1192                                            optname, optval, &len);
1193                 release_sock(sk);
1194                 if (err >= 0)
1195                         err = put_user(len, optlen);
1196         }
1197 #endif
1198         return err;
1199 }
1200
1201 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1202 #endif
1203