net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  *
  15  *      FIXME: Make the setsockopt code POSIX compliant: That is
  16  *
  17  *      o       Truncate getsockopt returns
  18  *      o       Return an optlen of the truncated length if need be
  19  *
  20  *      Changes:
  21  *      David L Stevens <dlstevens@us.ibm.com>:
  22  *              - added multicast source filtering API for MLDv2
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/capability.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/socket.h>
  30 #include <linux/sockios.h>
  31 #include <linux/net.h>
  32 #include <linux/in6.h>
  33 #include <linux/mroute6.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/init.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/netfilter.h>
  39 #include <linux/slab.h>
  40
  41 #include <net/sock.h>
  42 #include <net/snmp.h>
  43 #include <net/ipv6.h>
  44 #include <net/ndisc.h>
  45 #include <net/protocol.h>
  46 #include <net/transp_v6.h>
  47 #include <net/ip6_route.h>
  48 #include <net/addrconf.h>
  49 #include <net/inet_common.h>
  50 #include <net/tcp.h>
  51 #include <net/udp.h>
  52 #include <net/udplite.h>
  53 #include <net/xfrm.h>
  54 #include <net/compat.h>
  55
  56 #include <asm/uaccess.h>
  57
  58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  59
  60 struct ip6_ra_chain *ip6_ra_chain;
  61 DEFINE_RWLOCK(ip6_ra_lock);
  62
  63 int ip6_ra_control(struct sock *sk, int sel)
  64 {
  65         struct ip6_ra_chain *ra, *new_ra, **rap;
  66
  67         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  68         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  69                 return -ENOPROTOOPT;
  70
  71         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  72
  73         write_lock_bh(&ip6_ra_lock);
  74         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  75                 if (ra->sk == sk) {
  76                         if (sel>=0) {
  77                                 write_unlock_bh(&ip6_ra_lock);
  78                                 kfree(new_ra);
  79                                 return -EADDRINUSE;
  80                         }
  81
  82                         *rap = ra->next;
  83                         write_unlock_bh(&ip6_ra_lock);
  84
  85                         sock_put(sk);
  86                         kfree(ra);
  87                         return 0;
  88                 }
  89         }
  90         if (new_ra == NULL) {
  91                 write_unlock_bh(&ip6_ra_lock);
  92                 return -ENOBUFS;
  93         }
  94         new_ra->sk = sk;
  95         new_ra->sel = sel;
  96         new_ra->next = ra;
  97         *rap = new_ra;
  98         sock_hold(sk);
  99         write_unlock_bh(&ip6_ra_lock);
 100         return 0;
 101 }
 102
 103 static
 104 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 105                                            struct ipv6_txoptions *opt)
 106 {
 107         if (inet_sk(sk)->is_icsk) {
 108                 if (opt &&
 109                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 110                     inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 111                         struct inet_connection_sock *icsk = inet_csk(sk);
 112                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 113                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 114                 }
 115                 opt = xchg(&inet6_sk(sk)->opt, opt);
 116         } else {
 117                 spin_lock(&sk->sk_dst_lock);
 118                 opt = xchg(&inet6_sk(sk)->opt, opt);
 119                 spin_unlock(&sk->sk_dst_lock);
 120         }
 121         sk_dst_reset(sk);
 122
 123         return opt;
 124 }
 125
 126 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 127                     char __user *optval, unsigned int optlen)
 128 {
 129         struct ipv6_pinfo *np = inet6_sk(sk);
 130         struct net *net = sock_net(sk);
 131         int val, valbool;
 132         int retv = -ENOPROTOOPT;
 133
 134         if (optval == NULL)
 135                 val=0;
 136         else {
 137                 if (optlen >= sizeof(int)) {
 138                         if (get_user(val, (int __user *) optval))
 139                                 return -EFAULT;
 140                 } else
 141                         val = 0;
 142         }
 143
 144         valbool = (val!=0);
 145
 146         if (ip6_mroute_opt(optname))
 147                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 148
 149         lock_sock(sk);
 150
 151         switch (optname) {
 152
 153         case IPV6_ADDRFORM:
 154                 if (optlen < sizeof(int))
 155                         goto e_inval;
 156                 if (val == PF_INET) {
 157                         struct ipv6_txoptions *opt;
 158                         struct sk_buff *pktopt;
 159
 160                         if (sk->sk_type == SOCK_RAW)
 161                                 break;
 162
 163                         if (sk->sk_protocol == IPPROTO_UDP ||
 164                             sk->sk_protocol == IPPROTO_UDPLITE) {
 165                                 struct udp_sock *up = udp_sk(sk);
 166                                 if (up->pending == AF_INET6) {
 167                                         retv = -EBUSY;
 168                                         break;
 169                                 }
 170                         } else if (sk->sk_protocol != IPPROTO_TCP)
 171                                 break;
 172
 173                         if (sk->sk_state != TCP_ESTABLISHED) {
 174                                 retv = -ENOTCONN;
 175                                 break;
 176                         }
 177
 178                         if (ipv6_only_sock(sk) ||
 179                             !ipv6_addr_v4mapped(&np->daddr)) {
 180                                 retv = -EADDRNOTAVAIL;
 181                                 break;
 182                         }
 183
 184                         fl6_free_socklist(sk);
 185                         ipv6_sock_mc_close(sk);
 186
 187                         /*
 188                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 189                          * remove it from the refcnt debug socks count in the
 190                          * original family...
 191                          */
 192                         sk_refcnt_debug_dec(sk);
 193
 194                         if (sk->sk_protocol == IPPROTO_TCP) {
 195                                 struct inet_connection_sock *icsk = inet_csk(sk);
 196                                 local_bh_disable();
 197                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 198                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 199                                 local_bh_enable();
 200                                 sk->sk_prot = &tcp_prot;
 201                                 icsk->icsk_af_ops = &ipv4_specific;
 202                                 sk->sk_socket->ops = &inet_stream_ops;
 203                                 sk->sk_family = PF_INET;
 204                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 205                         } else {
 206                                 struct proto *prot = &udp_prot;
 207
 208                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 209                                         prot = &udplite_prot;
 210                                 local_bh_disable();
 211                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 212                                 sock_prot_inuse_add(net, prot, 1);
 213                                 local_bh_enable();
 214                                 sk->sk_prot = prot;
 215                                 sk->sk_socket->ops = &inet_dgram_ops;
 216                                 sk->sk_family = PF_INET;
 217                         }
 218                         opt = xchg(&np->opt, NULL);
 219                         if (opt)
 220                                 sock_kfree_s(sk, opt, opt->tot_len);
 221                         pktopt = xchg(&np->pktoptions, NULL);
 222                         kfree_skb(pktopt);
 223
 224                         sk->sk_destruct = inet_sock_destruct;
 225                         /*
 226                          * ... and add it to the refcnt debug socks count
 227                          * in the new family. -acme
 228                          */
 229                         sk_refcnt_debug_inc(sk);
 230                         module_put(THIS_MODULE);
 231                         retv = 0;
 232                         break;
 233                 }
 234                 goto e_inval;
 235
 236         case IPV6_V6ONLY:
 237                 if (optlen < sizeof(int) ||
 238                     inet_sk(sk)->inet_num)
 239                         goto e_inval;
 240                 np->ipv6only = valbool;
 241                 retv = 0;
 242                 break;
 243
 244         case IPV6_RECVPKTINFO:
 245                 if (optlen < sizeof(int))
 246                         goto e_inval;
 247                 np->rxopt.bits.rxinfo = valbool;
 248                 retv = 0;
 249                 break;
 250
 251         case IPV6_2292PKTINFO:
 252                 if (optlen < sizeof(int))
 253                         goto e_inval;
 254                 np->rxopt.bits.rxoinfo = valbool;
 255                 retv = 0;
 256                 break;
 257
 258         case IPV6_RECVHOPLIMIT:
 259                 if (optlen < sizeof(int))
 260                         goto e_inval;
 261                 np->rxopt.bits.rxhlim = valbool;
 262                 retv = 0;
 263                 break;
 264
 265         case IPV6_2292HOPLIMIT:
 266                 if (optlen < sizeof(int))
 267                         goto e_inval;
 268                 np->rxopt.bits.rxohlim = valbool;
 269                 retv = 0;
 270                 break;
 271
 272         case IPV6_RECVRTHDR:
 273                 if (optlen < sizeof(int))
 274                         goto e_inval;
 275                 np->rxopt.bits.srcrt = valbool;
 276                 retv = 0;
 277                 break;
 278
 279         case IPV6_2292RTHDR:
 280                 if (optlen < sizeof(int))
 281                         goto e_inval;
 282                 np->rxopt.bits.osrcrt = valbool;
 283                 retv = 0;
 284                 break;
 285
 286         case IPV6_RECVHOPOPTS:
 287                 if (optlen < sizeof(int))
 288                         goto e_inval;
 289                 np->rxopt.bits.hopopts = valbool;
 290                 retv = 0;
 291                 break;
 292
 293         case IPV6_2292HOPOPTS:
 294                 if (optlen < sizeof(int))
 295                         goto e_inval;
 296                 np->rxopt.bits.ohopopts = valbool;
 297                 retv = 0;
 298                 break;
 299
 300         case IPV6_RECVDSTOPTS:
 301                 if (optlen < sizeof(int))
 302                         goto e_inval;
 303                 np->rxopt.bits.dstopts = valbool;
 304                 retv = 0;
 305                 break;
 306
 307         case IPV6_2292DSTOPTS:
 308                 if (optlen < sizeof(int))
 309                         goto e_inval;
 310                 np->rxopt.bits.odstopts = valbool;
 311                 retv = 0;
 312                 break;
 313
 314         case IPV6_TCLASS:
 315                 if (optlen < sizeof(int))
 316                         goto e_inval;
 317                 if (val < -1 || val > 0xff)
 318                         goto e_inval;
 319                 /* RFC 3542, 6.5: default traffic class of 0x0 */
 320                 if (val == -1)
 321                         val = 0;
 322                 np->tclass = val;
 323                 retv = 0;
 324                 break;
 325
 326         case IPV6_RECVTCLASS:
 327                 if (optlen < sizeof(int))
 328                         goto e_inval;
 329                 np->rxopt.bits.rxtclass = valbool;
 330                 retv = 0;
 331                 break;
 332
 333         case IPV6_FLOWINFO:
 334                 if (optlen < sizeof(int))
 335                         goto e_inval;
 336                 np->rxopt.bits.rxflow = valbool;
 337                 retv = 0;
 338                 break;
 339
 340         case IPV6_HOPOPTS:
 341         case IPV6_RTHDRDSTOPTS:
 342         case IPV6_RTHDR:
 343         case IPV6_DSTOPTS:
 344         {
 345                 struct ipv6_txoptions *opt;
 346
 347                 /* remove any sticky options header with a zero option
 348                  * length, per RFC3542.
 349                  */
 350                 if (optlen == 0)
 351                         optval = NULL;
 352                 else if (optval == NULL)
 353                         goto e_inval;
 354                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 355                          optlen & 0x7 || optlen > 8 * 255)
 356                         goto e_inval;
 357
 358                 /* hop-by-hop / destination options are privileged option */
 359                 retv = -EPERM;
 360                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 361                         break;
 362
 363                 opt = ipv6_renew_options(sk, np->opt, optname,
 364                                          (struct ipv6_opt_hdr __user *)optval,
 365                                          optlen);
 366                 if (IS_ERR(opt)) {
 367                         retv = PTR_ERR(opt);
 368                         break;
 369                 }
 370
 371                 /* routing header option needs extra check */
 372                 retv = -EINVAL;
 373                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 374                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 375                         switch (rthdr->type) {
 376 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 377                         case IPV6_SRCRT_TYPE_2:
 378                                 if (rthdr->hdrlen != 2 ||
 379                                     rthdr->segments_left != 1)
 380                                         goto sticky_done;
 381
 382                                 break;
 383 #endif
 384                         default:
 385                                 goto sticky_done;
 386                         }
 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                 fl.mark = sk->sk_mark;
 429
 430                 if (optlen == 0)
 431                         goto update;
 432
 433                 /* 1K is probably excessive
 434                  * 1K is surely not enough, 2K per standard header is 16K.
 435                  */
 436                 retv = -EINVAL;
 437                 if (optlen > 64*1024)
 438                         break;
 439
 440                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 441                 retv = -ENOBUFS;
 442                 if (opt == NULL)
 443                         break;
 444
 445                 memset(opt, 0, sizeof(*opt));
 446                 opt->tot_len = sizeof(*opt) + optlen;
 447                 retv = -EFAULT;
 448                 if (copy_from_user(opt+1, optval, optlen))
 449                         goto done;
 450
 451                 msg.msg_controllen = optlen;
 452                 msg.msg_control = (void*)(opt+1);
 453
 454                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
 455                 if (retv)
 456                         goto done;
 457 update:
 458                 retv = 0;
 459                 opt = ipv6_update_options(sk, opt);
 460 done:
 461                 if (opt)
 462                         sock_kfree_s(sk, opt, opt->tot_len);
 463                 break;
 464         }
 465         case IPV6_UNICAST_HOPS:
 466                 if (optlen < sizeof(int))
 467                         goto e_inval;
 468                 if (val > 255 || val < -1)
 469                         goto e_inval;
 470                 np->hop_limit = val;
 471                 retv = 0;
 472                 break;
 473
 474         case IPV6_MULTICAST_HOPS:
 475                 if (sk->sk_type == SOCK_STREAM)
 476                         break;
 477                 if (optlen < sizeof(int))
 478                         goto e_inval;
 479                 if (val > 255 || val < -1)
 480                         goto e_inval;
 481                 np->mcast_hops = val;
 482                 retv = 0;
 483                 break;
 484
 485         case IPV6_MULTICAST_LOOP:
 486                 if (optlen < sizeof(int))
 487                         goto e_inval;
 488                 if (val != valbool)
 489                         goto e_inval;
 490                 np->mc_loop = valbool;
 491                 retv = 0;
 492                 break;
 493
 494         case IPV6_MULTICAST_IF:
 495                 if (sk->sk_type == SOCK_STREAM)
 496                         break;
 497                 if (optlen < sizeof(int))
 498                         goto e_inval;
 499
 500                 if (val) {
 501                         struct net_device *dev;
 502
 503                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 504                                 goto e_inval;
 505
 506                         dev = dev_get_by_index(net, val);
 507                         if (!dev) {
 508                                 retv = -ENODEV;
 509                                 break;
 510                         }
 511                         dev_put(dev);
 512                 }
 513                 np->mcast_oif = val;
 514                 retv = 0;
 515                 break;
 516         case IPV6_ADD_MEMBERSHIP:
 517         case IPV6_DROP_MEMBERSHIP:
 518         {
 519                 struct ipv6_mreq mreq;
 520
 521                 if (optlen < sizeof(struct ipv6_mreq))
 522                         goto e_inval;
 523
 524                 retv = -EPROTO;
 525                 if (inet_sk(sk)->is_icsk)
 526                         break;
 527
 528                 retv = -EFAULT;
 529                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 530                         break;
 531
 532                 if (optname == IPV6_ADD_MEMBERSHIP)
 533                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 534                 else
 535                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 536                 break;
 537         }
 538         case IPV6_JOIN_ANYCAST:
 539         case IPV6_LEAVE_ANYCAST:
 540         {
 541                 struct ipv6_mreq mreq;
 542
 543                 if (optlen < sizeof(struct ipv6_mreq))
 544                         goto e_inval;
 545
 546                 retv = -EFAULT;
 547                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 548                         break;
 549
 550                 if (optname == IPV6_JOIN_ANYCAST)
 551                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 552                 else
 553                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 554                 break;
 555         }
 556         case MCAST_JOIN_GROUP:
 557         case MCAST_LEAVE_GROUP:
 558         {
 559                 struct group_req greq;
 560                 struct sockaddr_in6 *psin6;
 561
 562                 if (optlen < sizeof(struct group_req))
 563                         goto e_inval;
 564
 565                 retv = -EFAULT;
 566                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 567                         break;
 568                 if (greq.gr_group.ss_family != AF_INET6) {
 569                         retv = -EADDRNOTAVAIL;
 570                         break;
 571                 }
 572                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 573                 if (optname == MCAST_JOIN_GROUP)
 574                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 575                                 &psin6->sin6_addr);
 576                 else
 577                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 578                                 &psin6->sin6_addr);
 579                 break;
 580         }
 581         case MCAST_JOIN_SOURCE_GROUP:
 582         case MCAST_LEAVE_SOURCE_GROUP:
 583         case MCAST_BLOCK_SOURCE:
 584         case MCAST_UNBLOCK_SOURCE:
 585         {
 586                 struct group_source_req greqs;
 587                 int omode, add;
 588
 589                 if (optlen < sizeof(struct group_source_req))
 590                         goto e_inval;
 591                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 592                         retv = -EFAULT;
 593                         break;
 594                 }
 595                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 596                     greqs.gsr_source.ss_family != AF_INET6) {
 597                         retv = -EADDRNOTAVAIL;
 598                         break;
 599                 }
 600                 if (optname == MCAST_BLOCK_SOURCE) {
 601                         omode = MCAST_EXCLUDE;
 602                         add = 1;
 603                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 604                         omode = MCAST_EXCLUDE;
 605                         add = 0;
 606                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 607                         struct sockaddr_in6 *psin6;
 608
 609                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 610                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 611                                 &psin6->sin6_addr);
 612                         /* prior join w/ different source is ok */
 613                         if (retv && retv != -EADDRINUSE)
 614                                 break;
 615                         omode = MCAST_INCLUDE;
 616                         add = 1;
 617                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 618                         omode = MCAST_INCLUDE;
 619                         add = 0;
 620                 }
 621                 retv = ip6_mc_source(add, omode, sk, &greqs);
 622                 break;
 623         }
 624         case MCAST_MSFILTER:
 625         {
 626                 extern int sysctl_mld_max_msf;
 627                 struct group_filter *gsf;
 628
 629                 if (optlen < GROUP_FILTER_SIZE(0))
 630                         goto e_inval;
 631                 if (optlen > sysctl_optmem_max) {
 632                         retv = -ENOBUFS;
 633                         break;
 634                 }
 635                 gsf = kmalloc(optlen,GFP_KERNEL);
 636                 if (!gsf) {
 637                         retv = -ENOBUFS;
 638                         break;
 639                 }
 640                 retv = -EFAULT;
 641                 if (copy_from_user(gsf, optval, optlen)) {
 642                         kfree(gsf);
 643                         break;
 644                 }
 645                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 646                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 647                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 648                         kfree(gsf);
 649                         retv = -ENOBUFS;
 650                         break;
 651                 }
 652                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 653                         kfree(gsf);
 654                         retv = -EINVAL;
 655                         break;
 656                 }
 657                 retv = ip6_mc_msfilter(sk, gsf);
 658                 kfree(gsf);
 659
 660                 break;
 661         }
 662         case IPV6_ROUTER_ALERT:
 663                 if (optlen < sizeof(int))
 664                         goto e_inval;
 665                 retv = ip6_ra_control(sk, val);
 666                 break;
 667         case IPV6_MTU_DISCOVER:
 668                 if (optlen < sizeof(int))
 669                         goto e_inval;
 670                 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
 671                         goto e_inval;
 672                 np->pmtudisc = val;
 673                 retv = 0;
 674                 break;
 675         case IPV6_MTU:
 676                 if (optlen < sizeof(int))
 677                         goto e_inval;
 678                 if (val && val < IPV6_MIN_MTU)
 679                         goto e_inval;
 680                 np->frag_size = val;
 681                 retv = 0;
 682                 break;
 683         case IPV6_RECVERR:
 684                 if (optlen < sizeof(int))
 685                         goto e_inval;
 686                 np->recverr = valbool;
 687                 if (!val)
 688                         skb_queue_purge(&sk->sk_error_queue);
 689                 retv = 0;
 690                 break;
 691         case IPV6_FLOWINFO_SEND:
 692                 if (optlen < sizeof(int))
 693                         goto e_inval;
 694                 np->sndflow = valbool;
 695                 retv = 0;
 696                 break;
 697         case IPV6_FLOWLABEL_MGR:
 698                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 699                 break;
 700         case IPV6_IPSEC_POLICY:
 701         case IPV6_XFRM_POLICY:
 702                 retv = -EPERM;
 703                 if (!capable(CAP_NET_ADMIN))
 704                         break;
 705                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 706                 break;
 707
 708         case IPV6_ADDR_PREFERENCES:
 709             {
 710                 unsigned int pref = 0;
 711                 unsigned int prefmask = ~0;
 712
 713                 if (optlen < sizeof(int))
 714                         goto e_inval;
 715
 716                 retv = -EINVAL;
 717
 718                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 719                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 720                                IPV6_PREFER_SRC_TMP|
 721                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 722                 case IPV6_PREFER_SRC_PUBLIC:
 723                         pref |= IPV6_PREFER_SRC_PUBLIC;
 724                         break;
 725                 case IPV6_PREFER_SRC_TMP:
 726                         pref |= IPV6_PREFER_SRC_TMP;
 727                         break;
 728                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 729                         break;
 730                 case 0:
 731                         goto pref_skip_pubtmp;
 732                 default:
 733                         goto e_inval;
 734                 }
 735
 736                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 737                               IPV6_PREFER_SRC_TMP);
 738 pref_skip_pubtmp:
 739
 740                 /* check HOME/COA conflicts */
 741                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 742                 case IPV6_PREFER_SRC_HOME:
 743                         break;
 744                 case IPV6_PREFER_SRC_COA:
 745                         pref |= IPV6_PREFER_SRC_COA;
 746                 case 0:
 747                         goto pref_skip_coa;
 748                 default:
 749                         goto e_inval;
 750                 }
 751
 752                 prefmask &= ~IPV6_PREFER_SRC_COA;
 753 pref_skip_coa:
 754
 755                 /* check CGA/NONCGA conflicts */
 756                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 757                 case IPV6_PREFER_SRC_CGA:
 758                 case IPV6_PREFER_SRC_NONCGA:
 759                 case 0:
 760                         break;
 761                 default:
 762                         goto e_inval;
 763                 }
 764
 765                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 766                 retv = 0;
 767
 768                 break;
 769             }
 770         case IPV6_MINHOPCOUNT:
 771                 if (optlen < sizeof(int))
 772                         goto e_inval;
 773                 if (val < 0 || val > 255)
 774                         goto e_inval;
 775                 np->min_hopcount = val;
 776                 retv = 0;
 777                 break;
 778         }
 779
 780         release_sock(sk);
 781
 782         return retv;
 783
 784 e_inval:
 785         release_sock(sk);
 786         return -EINVAL;
 787 }
 788
 789 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 790                     char __user *optval, unsigned int optlen)
 791 {
 792         int err;
 793
 794         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 795                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 796
 797         if (level != SOL_IPV6)
 798                 return -ENOPROTOOPT;
 799
 800         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 801 #ifdef CONFIG_NETFILTER
 802         /* we need to exclude all possible ENOPROTOOPTs except default case */
 803         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 804                         optname != IPV6_XFRM_POLICY) {
 805                 lock_sock(sk);
 806                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 807                                 optlen);
 808                 release_sock(sk);
 809         }
 810 #endif
 811         return err;
 812 }
 813
 814 EXPORT_SYMBOL(ipv6_setsockopt);
 815
 816 #ifdef CONFIG_COMPAT
 817 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 818                            char __user *optval, unsigned int optlen)
 819 {
 820         int err;
 821
 822         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 823                 if (udp_prot.compat_setsockopt != NULL)
 824                         return udp_prot.compat_setsockopt(sk, level, optname,
 825                                                           optval, optlen);
 826                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 827         }
 828
 829         if (level != SOL_IPV6)
 830                 return -ENOPROTOOPT;
 831
 832         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 833                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 834                         ipv6_setsockopt);
 835
 836         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 837 #ifdef CONFIG_NETFILTER
 838         /* we need to exclude all possible ENOPROTOOPTs except default case */
 839         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 840             optname != IPV6_XFRM_POLICY) {
 841                 lock_sock(sk);
 842                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 843                                            optval, optlen);
 844                 release_sock(sk);
 845         }
 846 #endif
 847         return err;
 848 }
 849
 850 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 851 #endif
 852
 853 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 854                                   int optname, char __user *optval, int len)
 855 {
 856         struct ipv6_opt_hdr *hdr;
 857
 858         if (!opt)
 859                 return 0;
 860
 861         switch(optname) {
 862         case IPV6_HOPOPTS:
 863                 hdr = opt->hopopt;
 864                 break;
 865         case IPV6_RTHDRDSTOPTS:
 866                 hdr = opt->dst0opt;
 867                 break;
 868         case IPV6_RTHDR:
 869                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 870                 break;
 871         case IPV6_DSTOPTS:
 872                 hdr = opt->dst1opt;
 873                 break;
 874         default:
 875                 return -EINVAL; /* should not happen */
 876         }
 877
 878         if (!hdr)
 879                 return 0;
 880
 881         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 882         if (copy_to_user(optval, hdr, len))
 883                 return -EFAULT;
 884         return len;
 885 }
 886
 887 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 888                     char __user *optval, int __user *optlen)
 889 {
 890         struct ipv6_pinfo *np = inet6_sk(sk);
 891         int len;
 892         int val;
 893
 894         if (ip6_mroute_opt(optname))
 895                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 896
 897         if (get_user(len, optlen))
 898                 return -EFAULT;
 899         switch (optname) {
 900         case IPV6_ADDRFORM:
 901                 if (sk->sk_protocol != IPPROTO_UDP &&
 902                     sk->sk_protocol != IPPROTO_UDPLITE &&
 903                     sk->sk_protocol != IPPROTO_TCP)
 904                         return -ENOPROTOOPT;
 905                 if (sk->sk_state != TCP_ESTABLISHED)
 906                         return -ENOTCONN;
 907                 val = sk->sk_family;
 908                 break;
 909         case MCAST_MSFILTER:
 910         {
 911                 struct group_filter gsf;
 912                 int err;
 913
 914                 if (len < GROUP_FILTER_SIZE(0))
 915                         return -EINVAL;
 916                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 917                         return -EFAULT;
 918                 if (gsf.gf_group.ss_family != AF_INET6)
 919                         return -EADDRNOTAVAIL;
 920                 lock_sock(sk);
 921                 err = ip6_mc_msfget(sk, &gsf,
 922                         (struct group_filter __user *)optval, optlen);
 923                 release_sock(sk);
 924                 return err;
 925         }
 926
 927         case IPV6_2292PKTOPTIONS:
 928         {
 929                 struct msghdr msg;
 930                 struct sk_buff *skb;
 931
 932                 if (sk->sk_type != SOCK_STREAM)
 933                         return -ENOPROTOOPT;
 934
 935                 msg.msg_control = optval;
 936                 msg.msg_controllen = len;
 937                 msg.msg_flags = 0;
 938
 939                 lock_sock(sk);
 940                 skb = np->pktoptions;
 941                 if (skb)
 942                         atomic_inc(&skb->users);
 943                 release_sock(sk);
 944
 945                 if (skb) {
 946                         int err = datagram_recv_ctl(sk, &msg, skb);
 947                         kfree_skb(skb);
 948                         if (err)
 949                                 return err;
 950                 } else {
 951                         if (np->rxopt.bits.rxinfo) {
 952                                 struct in6_pktinfo src_info;
 953                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 954                                         np->sticky_pktinfo.ipi6_ifindex;
 955                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 956                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 957                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 958                         }
 959                         if (np->rxopt.bits.rxhlim) {
 960                                 int hlim = np->mcast_hops;
 961                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 962                         }
 963                         if (np->rxopt.bits.rxoinfo) {
 964                                 struct in6_pktinfo src_info;
 965                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 966                                         np->sticky_pktinfo.ipi6_ifindex;
 967                                 np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 968                                         ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 969                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 970                         }
 971                         if (np->rxopt.bits.rxohlim) {
 972                                 int hlim = np->mcast_hops;
 973                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 974                         }
 975                 }
 976                 len -= msg.msg_controllen;
 977                 return put_user(len, optlen);
 978         }
 979         case IPV6_MTU:
 980         {
 981                 struct dst_entry *dst;
 982
 983                 val = 0;
 984                 rcu_read_lock();
 985                 dst = __sk_dst_get(sk);
 986                 if (dst)
 987                         val = dst_mtu(dst);
 988                 rcu_read_unlock();
 989                 if (!val)
 990                         return -ENOTCONN;
 991                 break;
 992         }
 993
 994         case IPV6_V6ONLY:
 995                 val = np->ipv6only;
 996                 break;
 997
 998         case IPV6_RECVPKTINFO:
 999                 val = np->rxopt.bits.rxinfo;
1000                 break;
1001
1002         case IPV6_2292PKTINFO:
1003                 val = np->rxopt.bits.rxoinfo;
1004                 break;
1005
1006         case IPV6_RECVHOPLIMIT:
1007                 val = np->rxopt.bits.rxhlim;
1008                 break;
1009
1010         case IPV6_2292HOPLIMIT:
1011                 val = np->rxopt.bits.rxohlim;
1012                 break;
1013
1014         case IPV6_RECVRTHDR:
1015                 val = np->rxopt.bits.srcrt;
1016                 break;
1017
1018         case IPV6_2292RTHDR:
1019                 val = np->rxopt.bits.osrcrt;
1020                 break;
1021
1022         case IPV6_HOPOPTS:
1023         case IPV6_RTHDRDSTOPTS:
1024         case IPV6_RTHDR:
1025         case IPV6_DSTOPTS:
1026         {
1027
1028                 lock_sock(sk);
1029                 len = ipv6_getsockopt_sticky(sk, np->opt,
1030                                              optname, optval, len);
1031                 release_sock(sk);
1032                 /* check if ipv6_getsockopt_sticky() returns err code */
1033                 if (len < 0)
1034                         return len;
1035                 return put_user(len, optlen);
1036         }
1037
1038         case IPV6_RECVHOPOPTS:
1039                 val = np->rxopt.bits.hopopts;
1040                 break;
1041
1042         case IPV6_2292HOPOPTS:
1043                 val = np->rxopt.bits.ohopopts;
1044                 break;
1045
1046         case IPV6_RECVDSTOPTS:
1047                 val = np->rxopt.bits.dstopts;
1048                 break;
1049
1050         case IPV6_2292DSTOPTS:
1051                 val = np->rxopt.bits.odstopts;
1052                 break;
1053
1054         case IPV6_TCLASS:
1055                 val = np->tclass;
1056                 break;
1057
1058         case IPV6_RECVTCLASS:
1059                 val = np->rxopt.bits.rxtclass;
1060                 break;
1061
1062         case IPV6_FLOWINFO:
1063                 val = np->rxopt.bits.rxflow;
1064                 break;
1065
1066         case IPV6_UNICAST_HOPS:
1067         case IPV6_MULTICAST_HOPS:
1068         {
1069                 struct dst_entry *dst;
1070
1071                 if (optname == IPV6_UNICAST_HOPS)
1072                         val = np->hop_limit;
1073                 else
1074                         val = np->mcast_hops;
1075
1076                 if (val < 0) {
1077                         rcu_read_lock();
1078                         dst = __sk_dst_get(sk);
1079                         if (dst)
1080                                 val = ip6_dst_hoplimit(dst);
1081                         rcu_read_unlock();
1082                 }
1083
1084                 if (val < 0)
1085                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1086                 break;
1087         }
1088
1089         case IPV6_MULTICAST_LOOP:
1090                 val = np->mc_loop;
1091                 break;
1092
1093         case IPV6_MULTICAST_IF:
1094                 val = np->mcast_oif;
1095                 break;
1096
1097         case IPV6_MTU_DISCOVER:
1098                 val = np->pmtudisc;
1099                 break;
1100
1101         case IPV6_RECVERR:
1102                 val = np->recverr;
1103                 break;
1104
1105         case IPV6_FLOWINFO_SEND:
1106                 val = np->sndflow;
1107                 break;
1108
1109         case IPV6_ADDR_PREFERENCES:
1110                 val = 0;
1111
1112                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1113                         val |= IPV6_PREFER_SRC_TMP;
1114                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1115                         val |= IPV6_PREFER_SRC_PUBLIC;
1116                 else {
1117                         /* XXX: should we return system default? */
1118                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1119                 }
1120
1121                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1122                         val |= IPV6_PREFER_SRC_COA;
1123                 else
1124                         val |= IPV6_PREFER_SRC_HOME;
1125                 break;
1126
1127         case IPV6_MINHOPCOUNT:
1128                 val = np->min_hopcount;
1129                 break;
1130
1131         default:
1132                 return -ENOPROTOOPT;
1133         }
1134         len = min_t(unsigned int, sizeof(int), len);
1135         if(put_user(len, optlen))
1136                 return -EFAULT;
1137         if(copy_to_user(optval,&val,len))
1138                 return -EFAULT;
1139         return 0;
1140 }
1141
1142 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1143                     char __user *optval, int __user *optlen)
1144 {
1145         int err;
1146
1147         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1148                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1149
1150         if(level != SOL_IPV6)
1151                 return -ENOPROTOOPT;
1152
1153         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1154 #ifdef CONFIG_NETFILTER
1155         /* we need to exclude all possible ENOPROTOOPTs except default case */
1156         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1157                 int len;
1158
1159                 if (get_user(len, optlen))
1160                         return -EFAULT;
1161
1162                 lock_sock(sk);
1163                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1164                                 &len);
1165                 release_sock(sk);
1166                 if (err >= 0)
1167                         err = put_user(len, optlen);
1168         }
1169 #endif
1170         return err;
1171 }
1172
1173 EXPORT_SYMBOL(ipv6_getsockopt);
1174
1175 #ifdef CONFIG_COMPAT
1176 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1177                            char __user *optval, int __user *optlen)
1178 {
1179         int err;
1180
1181         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1182                 if (udp_prot.compat_getsockopt != NULL)
1183                         return udp_prot.compat_getsockopt(sk, level, optname,
1184                                                           optval, optlen);
1185                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1186         }
1187
1188         if (level != SOL_IPV6)
1189                 return -ENOPROTOOPT;
1190
1191         if (optname == MCAST_MSFILTER)
1192                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1193                         ipv6_getsockopt);
1194
1195         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1196 #ifdef CONFIG_NETFILTER
1197         /* we need to exclude all possible ENOPROTOOPTs except default case */
1198         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1199                 int len;
1200
1201                 if (get_user(len, optlen))
1202                         return -EFAULT;
1203
1204                 lock_sock(sk);
1205                 err = compat_nf_getsockopt(sk, PF_INET6,
1206                                            optname, optval, &len);
1207                 release_sock(sk);
1208                 if (err >= 0)
1209                         err = put_user(len, optlen);
1210         }
1211 #endif
1212         return err;
1213 }
1214
1215 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1216 #endif
1217