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
  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)->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)->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, 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)->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                 np->tclass = val;
 319                 retv = 0;
 320                 break;
 321
 322         case IPV6_RECVTCLASS:
 323                 if (optlen < sizeof(int))
 324                         goto e_inval;
 325                 np->rxopt.bits.rxtclass = valbool;
 326                 retv = 0;
 327                 break;
 328
 329         case IPV6_FLOWINFO:
 330                 if (optlen < sizeof(int))
 331                         goto e_inval;
 332                 np->rxopt.bits.rxflow = valbool;
 333                 retv = 0;
 334                 break;
 335
 336         case IPV6_HOPOPTS:
 337         case IPV6_RTHDRDSTOPTS:
 338         case IPV6_RTHDR:
 339         case IPV6_DSTOPTS:
 340         {
 341                 struct ipv6_txoptions *opt;
 342
 343                 /* remove any sticky options header with a zero option
 344                  * length, per RFC3542.
 345                  */
 346                 if (optlen == 0)
 347                         optval = NULL;
 348                 else if (optval == NULL)
 349                         goto e_inval;
 350                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 351                          optlen & 0x7 || optlen > 8 * 255)
 352                         goto e_inval;
 353
 354                 /* hop-by-hop / destination options are privileged option */
 355                 retv = -EPERM;
 356                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 357                         break;
 358
 359                 opt = ipv6_renew_options(sk, np->opt, optname,
 360                                          (struct ipv6_opt_hdr __user *)optval,
 361                                          optlen);
 362                 if (IS_ERR(opt)) {
 363                         retv = PTR_ERR(opt);
 364                         break;
 365                 }
 366
 367                 /* routing header option needs extra check */
 368                 retv = -EINVAL;
 369                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 370                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 371                         switch (rthdr->type) {
 372 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 373                         case IPV6_SRCRT_TYPE_2:
 374                                 if (rthdr->hdrlen != 2 ||
 375                                     rthdr->segments_left != 1)
 376                                         goto sticky_done;
 377
 378                                 break;
 379 #endif
 380                         default:
 381                                 goto sticky_done;
 382                         }
 383
 384                         if ((rthdr->hdrlen & 1) ||
 385                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 386                                 goto sticky_done;
 387                 }
 388
 389                 retv = 0;
 390                 opt = ipv6_update_options(sk, opt);
 391 sticky_done:
 392                 if (opt)
 393                         sock_kfree_s(sk, opt, opt->tot_len);
 394                 break;
 395         }
 396
 397         case IPV6_PKTINFO:
 398         {
 399                 struct in6_pktinfo pkt;
 400
 401                 if (optlen == 0)
 402                         goto e_inval;
 403                 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
 404                         goto e_inval;
 405
 406                 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 407                                 retv = -EFAULT;
 408                                 break;
 409                 }
 410                 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 411                         goto e_inval;
 412
 413                 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 414                 ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
 415                 retv = 0;
 416                 break;
 417         }
 418
 419         case IPV6_2292PKTOPTIONS:
 420         {
 421                 struct ipv6_txoptions *opt = NULL;
 422                 struct msghdr msg;
 423                 struct flowi fl;
 424                 int junk;
 425
 426                 fl.fl6_flowlabel = 0;
 427                 fl.oif = sk->sk_bound_dev_if;
 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                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 501                                 goto e_inval;
 502
 503                         if (__dev_get_by_index(net, val) == NULL) {
 504                                 retv = -ENODEV;
 505                                 break;
 506                         }
 507                 }
 508                 np->mcast_oif = val;
 509                 retv = 0;
 510                 break;
 511         case IPV6_ADD_MEMBERSHIP:
 512         case IPV6_DROP_MEMBERSHIP:
 513         {
 514                 struct ipv6_mreq mreq;
 515
 516                 if (optlen < sizeof(struct ipv6_mreq))
 517                         goto e_inval;
 518
 519                 retv = -EPROTO;
 520                 if (inet_sk(sk)->is_icsk)
 521                         break;
 522
 523                 retv = -EFAULT;
 524                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 525                         break;
 526
 527                 if (optname == IPV6_ADD_MEMBERSHIP)
 528                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 529                 else
 530                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 531                 break;
 532         }
 533         case IPV6_JOIN_ANYCAST:
 534         case IPV6_LEAVE_ANYCAST:
 535         {
 536                 struct ipv6_mreq mreq;
 537
 538                 if (optlen < sizeof(struct ipv6_mreq))
 539                         goto e_inval;
 540
 541                 retv = -EFAULT;
 542                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 543                         break;
 544
 545                 if (optname == IPV6_JOIN_ANYCAST)
 546                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 547                 else
 548                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 549                 break;
 550         }
 551         case MCAST_JOIN_GROUP:
 552         case MCAST_LEAVE_GROUP:
 553         {
 554                 struct group_req greq;
 555                 struct sockaddr_in6 *psin6;
 556
 557                 if (optlen < sizeof(struct group_req))
 558                         goto e_inval;
 559
 560                 retv = -EFAULT;
 561                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 562                         break;
 563                 if (greq.gr_group.ss_family != AF_INET6) {
 564                         retv = -EADDRNOTAVAIL;
 565                         break;
 566                 }
 567                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 568                 if (optname == MCAST_JOIN_GROUP)
 569                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 570                                 &psin6->sin6_addr);
 571                 else
 572                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 573                                 &psin6->sin6_addr);
 574                 break;
 575         }
 576         case MCAST_JOIN_SOURCE_GROUP:
 577         case MCAST_LEAVE_SOURCE_GROUP:
 578         case MCAST_BLOCK_SOURCE:
 579         case MCAST_UNBLOCK_SOURCE:
 580         {
 581                 struct group_source_req greqs;
 582                 int omode, add;
 583
 584                 if (optlen < sizeof(struct group_source_req))
 585                         goto e_inval;
 586                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 587                         retv = -EFAULT;
 588                         break;
 589                 }
 590                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 591                     greqs.gsr_source.ss_family != AF_INET6) {
 592                         retv = -EADDRNOTAVAIL;
 593                         break;
 594                 }
 595                 if (optname == MCAST_BLOCK_SOURCE) {
 596                         omode = MCAST_EXCLUDE;
 597                         add = 1;
 598                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 599                         omode = MCAST_EXCLUDE;
 600                         add = 0;
 601                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 602                         struct sockaddr_in6 *psin6;
 603
 604                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 605                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 606                                 &psin6->sin6_addr);
 607                         /* prior join w/ different source is ok */
 608                         if (retv && retv != -EADDRINUSE)
 609                                 break;
 610                         omode = MCAST_INCLUDE;
 611                         add = 1;
 612                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 613                         omode = MCAST_INCLUDE;
 614                         add = 0;
 615                 }
 616                 retv = ip6_mc_source(add, omode, sk, &greqs);
 617                 break;
 618         }
 619         case MCAST_MSFILTER:
 620         {
 621                 extern int sysctl_mld_max_msf;
 622                 struct group_filter *gsf;
 623
 624                 if (optlen < GROUP_FILTER_SIZE(0))
 625                         goto e_inval;
 626                 if (optlen > sysctl_optmem_max) {
 627                         retv = -ENOBUFS;
 628                         break;
 629                 }
 630                 gsf = kmalloc(optlen,GFP_KERNEL);
 631                 if (!gsf) {
 632                         retv = -ENOBUFS;
 633                         break;
 634                 }
 635                 retv = -EFAULT;
 636                 if (copy_from_user(gsf, optval, optlen)) {
 637                         kfree(gsf);
 638                         break;
 639                 }
 640                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 641                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 642                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 643                         kfree(gsf);
 644                         retv = -ENOBUFS;
 645                         break;
 646                 }
 647                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 648                         kfree(gsf);
 649                         retv = -EINVAL;
 650                         break;
 651                 }
 652                 retv = ip6_mc_msfilter(sk, gsf);
 653                 kfree(gsf);
 654
 655                 break;
 656         }
 657         case IPV6_ROUTER_ALERT:
 658                 if (optlen < sizeof(int))
 659                         goto e_inval;
 660                 retv = ip6_ra_control(sk, val);
 661                 break;
 662         case IPV6_MTU_DISCOVER:
 663                 if (optlen < sizeof(int))
 664                         goto e_inval;
 665                 if (val<0 || val>3)
 666                         goto e_inval;
 667                 np->pmtudisc = val;
 668                 retv = 0;
 669                 break;
 670         case IPV6_MTU:
 671                 if (optlen < sizeof(int))
 672                         goto e_inval;
 673                 if (val && val < IPV6_MIN_MTU)
 674                         goto e_inval;
 675                 np->frag_size = val;
 676                 retv = 0;
 677                 break;
 678         case IPV6_RECVERR:
 679                 if (optlen < sizeof(int))
 680                         goto e_inval;
 681                 np->recverr = valbool;
 682                 if (!val)
 683                         skb_queue_purge(&sk->sk_error_queue);
 684                 retv = 0;
 685                 break;
 686         case IPV6_FLOWINFO_SEND:
 687                 if (optlen < sizeof(int))
 688                         goto e_inval;
 689                 np->sndflow = valbool;
 690                 retv = 0;
 691                 break;
 692         case IPV6_FLOWLABEL_MGR:
 693                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 694                 break;
 695         case IPV6_IPSEC_POLICY:
 696         case IPV6_XFRM_POLICY:
 697                 retv = -EPERM;
 698                 if (!capable(CAP_NET_ADMIN))
 699                         break;
 700                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 701                 break;
 702
 703         case IPV6_ADDR_PREFERENCES:
 704             {
 705                 unsigned int pref = 0;
 706                 unsigned int prefmask = ~0;
 707
 708                 if (optlen < sizeof(int))
 709                         goto e_inval;
 710
 711                 retv = -EINVAL;
 712
 713                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 714                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 715                                IPV6_PREFER_SRC_TMP|
 716                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 717                 case IPV6_PREFER_SRC_PUBLIC:
 718                         pref |= IPV6_PREFER_SRC_PUBLIC;
 719                         break;
 720                 case IPV6_PREFER_SRC_TMP:
 721                         pref |= IPV6_PREFER_SRC_TMP;
 722                         break;
 723                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 724                         break;
 725                 case 0:
 726                         goto pref_skip_pubtmp;
 727                 default:
 728                         goto e_inval;
 729                 }
 730
 731                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 732                               IPV6_PREFER_SRC_TMP);
 733 pref_skip_pubtmp:
 734
 735                 /* check HOME/COA conflicts */
 736                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 737                 case IPV6_PREFER_SRC_HOME:
 738                         break;
 739                 case IPV6_PREFER_SRC_COA:
 740                         pref |= IPV6_PREFER_SRC_COA;
 741                 case 0:
 742                         goto pref_skip_coa;
 743                 default:
 744                         goto e_inval;
 745                 }
 746
 747                 prefmask &= ~IPV6_PREFER_SRC_COA;
 748 pref_skip_coa:
 749
 750                 /* check CGA/NONCGA conflicts */
 751                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 752                 case IPV6_PREFER_SRC_CGA:
 753                 case IPV6_PREFER_SRC_NONCGA:
 754                 case 0:
 755                         break;
 756                 default:
 757                         goto e_inval;
 758                 }
 759
 760                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 761                 retv = 0;
 762
 763                 break;
 764             }
 765         }
 766
 767         release_sock(sk);
 768
 769         return retv;
 770
 771 e_inval:
 772         release_sock(sk);
 773         return -EINVAL;
 774 }
 775
 776 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 777                     char __user *optval, int optlen)
 778 {
 779         int err;
 780
 781         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 782                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 783
 784         if (level != SOL_IPV6)
 785                 return -ENOPROTOOPT;
 786
 787         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 788 #ifdef CONFIG_NETFILTER
 789         /* we need to exclude all possible ENOPROTOOPTs except default case */
 790         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 791                         optname != IPV6_XFRM_POLICY) {
 792                 lock_sock(sk);
 793                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 794                                 optlen);
 795                 release_sock(sk);
 796         }
 797 #endif
 798         return err;
 799 }
 800
 801 EXPORT_SYMBOL(ipv6_setsockopt);
 802
 803 #ifdef CONFIG_COMPAT
 804 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 805                            char __user *optval, int optlen)
 806 {
 807         int err;
 808
 809         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 810                 if (udp_prot.compat_setsockopt != NULL)
 811                         return udp_prot.compat_setsockopt(sk, level, optname,
 812                                                           optval, optlen);
 813                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 814         }
 815
 816         if (level != SOL_IPV6)
 817                 return -ENOPROTOOPT;
 818
 819         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 820                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 821                         ipv6_setsockopt);
 822
 823         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 824 #ifdef CONFIG_NETFILTER
 825         /* we need to exclude all possible ENOPROTOOPTs except default case */
 826         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 827             optname != IPV6_XFRM_POLICY) {
 828                 lock_sock(sk);
 829                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 830                                            optval, optlen);
 831                 release_sock(sk);
 832         }
 833 #endif
 834         return err;
 835 }
 836
 837 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 838 #endif
 839
 840 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 841                                   int optname, char __user *optval, int len)
 842 {
 843         struct ipv6_opt_hdr *hdr;
 844
 845         if (!opt)
 846                 return 0;
 847
 848         switch(optname) {
 849         case IPV6_HOPOPTS:
 850                 hdr = opt->hopopt;
 851                 break;
 852         case IPV6_RTHDRDSTOPTS:
 853                 hdr = opt->dst0opt;
 854                 break;
 855         case IPV6_RTHDR:
 856                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 857                 break;
 858         case IPV6_DSTOPTS:
 859                 hdr = opt->dst1opt;
 860                 break;
 861         default:
 862                 return -EINVAL; /* should not happen */
 863         }
 864
 865         if (!hdr)
 866                 return 0;
 867
 868         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 869         if (copy_to_user(optval, hdr, len))
 870                 return -EFAULT;
 871         return len;
 872 }
 873
 874 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 875                     char __user *optval, int __user *optlen)
 876 {
 877         struct ipv6_pinfo *np = inet6_sk(sk);
 878         int len;
 879         int val;
 880
 881         if (ip6_mroute_opt(optname))
 882                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 883
 884         if (get_user(len, optlen))
 885                 return -EFAULT;
 886         switch (optname) {
 887         case IPV6_ADDRFORM:
 888                 if (sk->sk_protocol != IPPROTO_UDP &&
 889                     sk->sk_protocol != IPPROTO_UDPLITE &&
 890                     sk->sk_protocol != IPPROTO_TCP)
 891                         return -ENOPROTOOPT;
 892                 if (sk->sk_state != TCP_ESTABLISHED)
 893                         return -ENOTCONN;
 894                 val = sk->sk_family;
 895                 break;
 896         case MCAST_MSFILTER:
 897         {
 898                 struct group_filter gsf;
 899                 int err;
 900
 901                 if (len < GROUP_FILTER_SIZE(0))
 902                         return -EINVAL;
 903                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 904                         return -EFAULT;
 905                 if (gsf.gf_group.ss_family != AF_INET6)
 906                         return -EADDRNOTAVAIL;
 907                 lock_sock(sk);
 908                 err = ip6_mc_msfget(sk, &gsf,
 909                         (struct group_filter __user *)optval, optlen);
 910                 release_sock(sk);
 911                 return err;
 912         }
 913
 914         case IPV6_2292PKTOPTIONS:
 915         {
 916                 struct msghdr msg;
 917                 struct sk_buff *skb;
 918
 919                 if (sk->sk_type != SOCK_STREAM)
 920                         return -ENOPROTOOPT;
 921
 922                 msg.msg_control = optval;
 923                 msg.msg_controllen = len;
 924                 msg.msg_flags = 0;
 925
 926                 lock_sock(sk);
 927                 skb = np->pktoptions;
 928                 if (skb)
 929                         atomic_inc(&skb->users);
 930                 release_sock(sk);
 931
 932                 if (skb) {
 933                         int err = datagram_recv_ctl(sk, &msg, skb);
 934                         kfree_skb(skb);
 935                         if (err)
 936                                 return err;
 937                 } else {
 938                         if (np->rxopt.bits.rxinfo) {
 939                                 struct in6_pktinfo src_info;
 940                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 941                                         np->sticky_pktinfo.ipi6_ifindex;
 942                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 943                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 944                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 945                         }
 946                         if (np->rxopt.bits.rxhlim) {
 947                                 int hlim = np->mcast_hops;
 948                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 949                         }
 950                         if (np->rxopt.bits.rxoinfo) {
 951                                 struct in6_pktinfo src_info;
 952                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 953                                         np->sticky_pktinfo.ipi6_ifindex;
 954                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 955                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 956                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 957                         }
 958                         if (np->rxopt.bits.rxohlim) {
 959                                 int hlim = np->mcast_hops;
 960                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 961                         }
 962                 }
 963                 len -= msg.msg_controllen;
 964                 return put_user(len, optlen);
 965         }
 966         case IPV6_MTU:
 967         {
 968                 struct dst_entry *dst;
 969                 val = 0;
 970                 lock_sock(sk);
 971                 dst = sk_dst_get(sk);
 972                 if (dst) {
 973                         val = dst_mtu(dst);
 974                         dst_release(dst);
 975                 }
 976                 release_sock(sk);
 977                 if (!val)
 978                         return -ENOTCONN;
 979                 break;
 980         }
 981
 982         case IPV6_V6ONLY:
 983                 val = np->ipv6only;
 984                 break;
 985
 986         case IPV6_RECVPKTINFO:
 987                 val = np->rxopt.bits.rxinfo;
 988                 break;
 989
 990         case IPV6_2292PKTINFO:
 991                 val = np->rxopt.bits.rxoinfo;
 992                 break;
 993
 994         case IPV6_RECVHOPLIMIT:
 995                 val = np->rxopt.bits.rxhlim;
 996                 break;
 997
 998         case IPV6_2292HOPLIMIT:
 999                 val = np->rxopt.bits.rxohlim;
1000                 break;
1001
1002         case IPV6_RECVRTHDR:
1003                 val = np->rxopt.bits.srcrt;
1004                 break;
1005
1006         case IPV6_2292RTHDR:
1007                 val = np->rxopt.bits.osrcrt;
1008                 break;
1009
1010         case IPV6_HOPOPTS:
1011         case IPV6_RTHDRDSTOPTS:
1012         case IPV6_RTHDR:
1013         case IPV6_DSTOPTS:
1014         {
1015
1016                 lock_sock(sk);
1017                 len = ipv6_getsockopt_sticky(sk, np->opt,
1018                                              optname, optval, len);
1019                 release_sock(sk);
1020                 /* check if ipv6_getsockopt_sticky() returns err code */
1021                 if (len < 0)
1022                         return len;
1023                 return put_user(len, optlen);
1024         }
1025
1026         case IPV6_RECVHOPOPTS:
1027                 val = np->rxopt.bits.hopopts;
1028                 break;
1029
1030         case IPV6_2292HOPOPTS:
1031                 val = np->rxopt.bits.ohopopts;
1032                 break;
1033
1034         case IPV6_RECVDSTOPTS:
1035                 val = np->rxopt.bits.dstopts;
1036                 break;
1037
1038         case IPV6_2292DSTOPTS:
1039                 val = np->rxopt.bits.odstopts;
1040                 break;
1041
1042         case IPV6_TCLASS:
1043                 val = np->tclass;
1044                 if (val < 0)
1045                         val = 0;
1046                 break;
1047
1048         case IPV6_RECVTCLASS:
1049                 val = np->rxopt.bits.rxtclass;
1050                 break;
1051
1052         case IPV6_FLOWINFO:
1053                 val = np->rxopt.bits.rxflow;
1054                 break;
1055
1056         case IPV6_UNICAST_HOPS:
1057         case IPV6_MULTICAST_HOPS:
1058         {
1059                 struct dst_entry *dst;
1060
1061                 if (optname == IPV6_UNICAST_HOPS)
1062                         val = np->hop_limit;
1063                 else
1064                         val = np->mcast_hops;
1065
1066                 dst = sk_dst_get(sk);
1067                 if (dst) {
1068                         if (val < 0)
1069                                 val = ip6_dst_hoplimit(dst);
1070                         dst_release(dst);
1071                 }
1072                 if (val < 0)
1073                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1074                 break;
1075         }
1076
1077         case IPV6_MULTICAST_LOOP:
1078                 val = np->mc_loop;
1079                 break;
1080
1081         case IPV6_MULTICAST_IF:
1082                 val = np->mcast_oif;
1083                 break;
1084
1085         case IPV6_MTU_DISCOVER:
1086                 val = np->pmtudisc;
1087                 break;
1088
1089         case IPV6_RECVERR:
1090                 val = np->recverr;
1091                 break;
1092
1093         case IPV6_FLOWINFO_SEND:
1094                 val = np->sndflow;
1095                 break;
1096
1097         case IPV6_ADDR_PREFERENCES:
1098                 val = 0;
1099
1100                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1101                         val |= IPV6_PREFER_SRC_TMP;
1102                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1103                         val |= IPV6_PREFER_SRC_PUBLIC;
1104                 else {
1105                         /* XXX: should we return system default? */
1106                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1107                 }
1108
1109                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1110                         val |= IPV6_PREFER_SRC_COA;
1111                 else
1112                         val |= IPV6_PREFER_SRC_HOME;
1113                 break;
1114
1115         default:
1116                 return -ENOPROTOOPT;
1117         }
1118         len = min_t(unsigned int, sizeof(int), len);
1119         if(put_user(len, optlen))
1120                 return -EFAULT;
1121         if(copy_to_user(optval,&val,len))
1122                 return -EFAULT;
1123         return 0;
1124 }
1125
1126 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1127                     char __user *optval, int __user *optlen)
1128 {
1129         int err;
1130
1131         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1132                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1133
1134         if(level != SOL_IPV6)
1135                 return -ENOPROTOOPT;
1136
1137         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1138 #ifdef CONFIG_NETFILTER
1139         /* we need to exclude all possible ENOPROTOOPTs except default case */
1140         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1141                 int len;
1142
1143                 if (get_user(len, optlen))
1144                         return -EFAULT;
1145
1146                 lock_sock(sk);
1147                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1148                                 &len);
1149                 release_sock(sk);
1150                 if (err >= 0)
1151                         err = put_user(len, optlen);
1152         }
1153 #endif
1154         return err;
1155 }
1156
1157 EXPORT_SYMBOL(ipv6_getsockopt);
1158
1159 #ifdef CONFIG_COMPAT
1160 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1161                            char __user *optval, int __user *optlen)
1162 {
1163         int err;
1164
1165         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1166                 if (udp_prot.compat_getsockopt != NULL)
1167                         return udp_prot.compat_getsockopt(sk, level, optname,
1168                                                           optval, optlen);
1169                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1170         }
1171
1172         if (level != SOL_IPV6)
1173                 return -ENOPROTOOPT;
1174
1175         if (optname == MCAST_MSFILTER)
1176                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1177                         ipv6_getsockopt);
1178
1179         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1180 #ifdef CONFIG_NETFILTER
1181         /* we need to exclude all possible ENOPROTOOPTs except default case */
1182         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1183                 int len;
1184
1185                 if (get_user(len, optlen))
1186                         return -EFAULT;
1187
1188                 lock_sock(sk);
1189                 err = compat_nf_getsockopt(sk, PF_INET6,
1190                                            optname, optval, &len);
1191                 release_sock(sk);
1192                 if (err >= 0)
1193                         err = put_user(len, optlen);
1194         }
1195 #endif
1196         return err;
1197 }
1198
1199 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1200 #endif
1201