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   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  *      FIXME: Make the setsockopt code POSIX compliant: That is
  18  *
  19  *      o       Return -EINVAL for setsockopt of short lengths
  20  *      o       Truncate getsockopt returns
  21  *      o       Return an optlen of the truncated length if need be
  22  *
  23  *      Changes:
  24  *      David L Stevens <dlstevens@us.ibm.com>:
  25  *              - added multicast source filtering API for MLDv2
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/capability.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/socket.h>
  33 #include <linux/sockios.h>
  34 #include <linux/net.h>
  35 #include <linux/in6.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/if_arp.h>
  38 #include <linux/init.h>
  39 #include <linux/sysctl.h>
  40 #include <linux/netfilter.h>
  41
  42 #include <net/sock.h>
  43 #include <net/snmp.h>
  44 #include <net/ipv6.h>
  45 #include <net/ndisc.h>
  46 #include <net/protocol.h>
  47 #include <net/transp_v6.h>
  48 #include <net/ip6_route.h>
  49 #include <net/addrconf.h>
  50 #include <net/inet_common.h>
  51 #include <net/tcp.h>
  52 #include <net/udp.h>
  53 #include <net/udplite.h>
  54 #include <net/xfrm.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, void (*destructor)(struct sock *))
  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)->num != IPPROTO_RAW)
  69                 return -EINVAL;
  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                         if (ra->destructor)
  86                                 ra->destructor(sk);
  87                         sock_put(sk);
  88                         kfree(ra);
  89                         return 0;
  90                 }
  91         }
  92         if (new_ra == NULL) {
  93                 write_unlock_bh(&ip6_ra_lock);
  94                 return -ENOBUFS;
  95         }
  96         new_ra->sk = sk;
  97         new_ra->sel = sel;
  98         new_ra->destructor = destructor;
  99         new_ra->next = ra;
 100         *rap = new_ra;
 101         sock_hold(sk);
 102         write_unlock_bh(&ip6_ra_lock);
 103         return 0;
 104 }
 105
 106 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 107                     char __user *optval, int optlen)
 108 {
 109         struct ipv6_pinfo *np = inet6_sk(sk);
 110         int val, valbool;
 111         int retv = -ENOPROTOOPT;
 112
 113         if (optval == NULL)
 114                 val=0;
 115         else if (get_user(val, (int __user *) optval))
 116                 return -EFAULT;
 117
 118         valbool = (val!=0);
 119
 120         lock_sock(sk);
 121
 122         switch (optname) {
 123
 124         case IPV6_ADDRFORM:
 125                 if (val == PF_INET) {
 126                         struct ipv6_txoptions *opt;
 127                         struct sk_buff *pktopt;
 128
 129                         if (sk->sk_protocol != IPPROTO_UDP &&
 130                             sk->sk_protocol != IPPROTO_UDPLITE &&
 131                             sk->sk_protocol != IPPROTO_TCP)
 132                                 break;
 133
 134                         if (sk->sk_state != TCP_ESTABLISHED) {
 135                                 retv = -ENOTCONN;
 136                                 break;
 137                         }
 138
 139                         if (ipv6_only_sock(sk) ||
 140                             !ipv6_addr_v4mapped(&np->daddr)) {
 141                                 retv = -EADDRNOTAVAIL;
 142                                 break;
 143                         }
 144
 145                         fl6_free_socklist(sk);
 146                         ipv6_sock_mc_close(sk);
 147
 148                         /*
 149                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 150                          * remove it from the refcnt debug socks count in the
 151                          * original family...
 152                          */
 153                         sk_refcnt_debug_dec(sk);
 154
 155                         if (sk->sk_protocol == IPPROTO_TCP) {
 156                                 struct inet_connection_sock *icsk = inet_csk(sk);
 157
 158                                 local_bh_disable();
 159                                 sock_prot_inuse_add(sk->sk_prot, -1);
 160                                 sock_prot_inuse_add(&tcp_prot, 1);
 161                                 local_bh_enable();
 162                                 sk->sk_prot = &tcp_prot;
 163                                 icsk->icsk_af_ops = &ipv4_specific;
 164                                 sk->sk_socket->ops = &inet_stream_ops;
 165                                 sk->sk_family = PF_INET;
 166                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 167                         } else {
 168                                 struct proto *prot = &udp_prot;
 169
 170                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 171                                         prot = &udplite_prot;
 172                                 local_bh_disable();
 173                                 sock_prot_inuse_add(sk->sk_prot, -1);
 174                                 sock_prot_inuse_add(prot, 1);
 175                                 local_bh_enable();
 176                                 sk->sk_prot = prot;
 177                                 sk->sk_socket->ops = &inet_dgram_ops;
 178                                 sk->sk_family = PF_INET;
 179                         }
 180                         opt = xchg(&np->opt, NULL);
 181                         if (opt)
 182                                 sock_kfree_s(sk, opt, opt->tot_len);
 183                         pktopt = xchg(&np->pktoptions, NULL);
 184                         if (pktopt)
 185                                 kfree_skb(pktopt);
 186
 187                         sk->sk_destruct = inet_sock_destruct;
 188                         /*
 189                          * ... and add it to the refcnt debug socks count
 190                          * in the new family. -acme
 191                          */
 192                         sk_refcnt_debug_inc(sk);
 193                         module_put(THIS_MODULE);
 194                         retv = 0;
 195                         break;
 196                 }
 197                 goto e_inval;
 198
 199         case IPV6_V6ONLY:
 200                 if (inet_sk(sk)->num)
 201                         goto e_inval;
 202                 np->ipv6only = valbool;
 203                 retv = 0;
 204                 break;
 205
 206         case IPV6_RECVPKTINFO:
 207                 np->rxopt.bits.rxinfo = valbool;
 208                 retv = 0;
 209                 break;
 210
 211         case IPV6_2292PKTINFO:
 212                 np->rxopt.bits.rxoinfo = valbool;
 213                 retv = 0;
 214                 break;
 215
 216         case IPV6_RECVHOPLIMIT:
 217                 np->rxopt.bits.rxhlim = valbool;
 218                 retv = 0;
 219                 break;
 220
 221         case IPV6_2292HOPLIMIT:
 222                 np->rxopt.bits.rxohlim = valbool;
 223                 retv = 0;
 224                 break;
 225
 226         case IPV6_RECVRTHDR:
 227                 np->rxopt.bits.srcrt = valbool;
 228                 retv = 0;
 229                 break;
 230
 231         case IPV6_2292RTHDR:
 232                 np->rxopt.bits.osrcrt = valbool;
 233                 retv = 0;
 234                 break;
 235
 236         case IPV6_RECVHOPOPTS:
 237                 np->rxopt.bits.hopopts = valbool;
 238                 retv = 0;
 239                 break;
 240
 241         case IPV6_2292HOPOPTS:
 242                 np->rxopt.bits.ohopopts = valbool;
 243                 retv = 0;
 244                 break;
 245
 246         case IPV6_RECVDSTOPTS:
 247                 np->rxopt.bits.dstopts = valbool;
 248                 retv = 0;
 249                 break;
 250
 251         case IPV6_2292DSTOPTS:
 252                 np->rxopt.bits.odstopts = valbool;
 253                 retv = 0;
 254                 break;
 255
 256         case IPV6_TCLASS:
 257                 if (val < -1 || val > 0xff)
 258                         goto e_inval;
 259                 np->tclass = val;
 260                 retv = 0;
 261                 break;
 262
 263         case IPV6_RECVTCLASS:
 264                 np->rxopt.bits.rxtclass = valbool;
 265                 retv = 0;
 266                 break;
 267
 268         case IPV6_FLOWINFO:
 269                 np->rxopt.bits.rxflow = valbool;
 270                 retv = 0;
 271                 break;
 272
 273         case IPV6_HOPOPTS:
 274         case IPV6_RTHDRDSTOPTS:
 275         case IPV6_RTHDR:
 276         case IPV6_DSTOPTS:
 277         {
 278                 struct ipv6_txoptions *opt;
 279                 if (optlen == 0)
 280                         optval = NULL;
 281
 282                 /* hop-by-hop / destination options are privileged option */
 283                 retv = -EPERM;
 284                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 285                         break;
 286
 287                 retv = -EINVAL;
 288                 if (optlen & 0x7 || optlen > 8 * 255)
 289                         break;
 290
 291                 opt = ipv6_renew_options(sk, np->opt, optname,
 292                                          (struct ipv6_opt_hdr __user *)optval,
 293                                          optlen);
 294                 if (IS_ERR(opt)) {
 295                         retv = PTR_ERR(opt);
 296                         break;
 297                 }
 298
 299                 /* routing header option needs extra check */
 300                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 301                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 302                         switch (rthdr->type) {
 303 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 304                         case IPV6_SRCRT_TYPE_2:
 305                                 break;
 306 #endif
 307                         default:
 308                                 goto sticky_done;
 309                         }
 310
 311                         if ((rthdr->hdrlen & 1) ||
 312                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 313                                 goto sticky_done;
 314                 }
 315
 316                 retv = 0;
 317                 if (inet_sk(sk)->is_icsk) {
 318                         if (opt) {
 319                                 struct inet_connection_sock *icsk = inet_csk(sk);
 320                                 if (!((1 << sk->sk_state) &
 321                                       (TCPF_LISTEN | TCPF_CLOSE))
 322                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 323                                         icsk->icsk_ext_hdr_len =
 324                                                 opt->opt_flen + opt->opt_nflen;
 325                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 326                                 }
 327                         }
 328                         opt = xchg(&np->opt, opt);
 329                         sk_dst_reset(sk);
 330                 } else {
 331                         write_lock(&sk->sk_dst_lock);
 332                         opt = xchg(&np->opt, opt);
 333                         write_unlock(&sk->sk_dst_lock);
 334                         sk_dst_reset(sk);
 335                 }
 336 sticky_done:
 337                 if (opt)
 338                         sock_kfree_s(sk, opt, opt->tot_len);
 339                 break;
 340         }
 341
 342         case IPV6_2292PKTOPTIONS:
 343         {
 344                 struct ipv6_txoptions *opt = NULL;
 345                 struct msghdr msg;
 346                 struct flowi fl;
 347                 int junk;
 348
 349                 fl.fl6_flowlabel = 0;
 350                 fl.oif = sk->sk_bound_dev_if;
 351
 352                 if (optlen == 0)
 353                         goto update;
 354
 355                 /* 1K is probably excessive
 356                  * 1K is surely not enough, 2K per standard header is 16K.
 357                  */
 358                 retv = -EINVAL;
 359                 if (optlen > 64*1024)
 360                         break;
 361
 362                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 363                 retv = -ENOBUFS;
 364                 if (opt == NULL)
 365                         break;
 366
 367                 memset(opt, 0, sizeof(*opt));
 368                 opt->tot_len = sizeof(*opt) + optlen;
 369                 retv = -EFAULT;
 370                 if (copy_from_user(opt+1, optval, optlen))
 371                         goto done;
 372
 373                 msg.msg_controllen = optlen;
 374                 msg.msg_control = (void*)(opt+1);
 375
 376                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 377                 if (retv)
 378                         goto done;
 379 update:
 380                 retv = 0;
 381                 if (inet_sk(sk)->is_icsk) {
 382                         if (opt) {
 383                                 struct inet_connection_sock *icsk = inet_csk(sk);
 384                                 if (!((1 << sk->sk_state) &
 385                                       (TCPF_LISTEN | TCPF_CLOSE))
 386                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 387                                         icsk->icsk_ext_hdr_len =
 388                                                 opt->opt_flen + opt->opt_nflen;
 389                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 390                                 }
 391                         }
 392                         opt = xchg(&np->opt, opt);
 393                         sk_dst_reset(sk);
 394                 } else {
 395                         write_lock(&sk->sk_dst_lock);
 396                         opt = xchg(&np->opt, opt);
 397                         write_unlock(&sk->sk_dst_lock);
 398                         sk_dst_reset(sk);
 399                 }
 400
 401 done:
 402                 if (opt)
 403                         sock_kfree_s(sk, opt, opt->tot_len);
 404                 break;
 405         }
 406         case IPV6_UNICAST_HOPS:
 407                 if (val > 255 || val < -1)
 408                         goto e_inval;
 409                 np->hop_limit = val;
 410                 retv = 0;
 411                 break;
 412
 413         case IPV6_MULTICAST_HOPS:
 414                 if (sk->sk_type == SOCK_STREAM)
 415                         goto e_inval;
 416                 if (val > 255 || val < -1)
 417                         goto e_inval;
 418                 np->mcast_hops = val;
 419                 retv = 0;
 420                 break;
 421
 422         case IPV6_MULTICAST_LOOP:
 423                 np->mc_loop = valbool;
 424                 retv = 0;
 425                 break;
 426
 427         case IPV6_MULTICAST_IF:
 428                 if (sk->sk_type == SOCK_STREAM)
 429                         goto e_inval;
 430
 431                 if (val) {
 432                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 433                                 goto e_inval;
 434
 435                         if (__dev_get_by_index(&init_net, val) == NULL) {
 436                                 retv = -ENODEV;
 437                                 break;
 438                         }
 439                 }
 440                 np->mcast_oif = val;
 441                 retv = 0;
 442                 break;
 443         case IPV6_ADD_MEMBERSHIP:
 444         case IPV6_DROP_MEMBERSHIP:
 445         {
 446                 struct ipv6_mreq mreq;
 447
 448                 retv = -EPROTO;
 449                 if (inet_sk(sk)->is_icsk)
 450                         break;
 451
 452                 retv = -EFAULT;
 453                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 454                         break;
 455
 456                 if (optname == IPV6_ADD_MEMBERSHIP)
 457                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 458                 else
 459                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 460                 break;
 461         }
 462         case IPV6_JOIN_ANYCAST:
 463         case IPV6_LEAVE_ANYCAST:
 464         {
 465                 struct ipv6_mreq mreq;
 466
 467                 if (optlen != sizeof(struct ipv6_mreq))
 468                         goto e_inval;
 469
 470                 retv = -EFAULT;
 471                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 472                         break;
 473
 474                 if (optname == IPV6_JOIN_ANYCAST)
 475                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 476                 else
 477                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 478                 break;
 479         }
 480         case MCAST_JOIN_GROUP:
 481         case MCAST_LEAVE_GROUP:
 482         {
 483                 struct group_req greq;
 484                 struct sockaddr_in6 *psin6;
 485
 486                 retv = -EFAULT;
 487                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 488                         break;
 489                 if (greq.gr_group.ss_family != AF_INET6) {
 490                         retv = -EADDRNOTAVAIL;
 491                         break;
 492                 }
 493                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 494                 if (optname == MCAST_JOIN_GROUP)
 495                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 496                                 &psin6->sin6_addr);
 497                 else
 498                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 499                                 &psin6->sin6_addr);
 500                 break;
 501         }
 502         case MCAST_JOIN_SOURCE_GROUP:
 503         case MCAST_LEAVE_SOURCE_GROUP:
 504         case MCAST_BLOCK_SOURCE:
 505         case MCAST_UNBLOCK_SOURCE:
 506         {
 507                 struct group_source_req greqs;
 508                 int omode, add;
 509
 510                 if (optlen != sizeof(struct group_source_req))
 511                         goto e_inval;
 512                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 513                         retv = -EFAULT;
 514                         break;
 515                 }
 516                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 517                     greqs.gsr_source.ss_family != AF_INET6) {
 518                         retv = -EADDRNOTAVAIL;
 519                         break;
 520                 }
 521                 if (optname == MCAST_BLOCK_SOURCE) {
 522                         omode = MCAST_EXCLUDE;
 523                         add = 1;
 524                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 525                         omode = MCAST_EXCLUDE;
 526                         add = 0;
 527                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 528                         struct sockaddr_in6 *psin6;
 529
 530                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 531                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 532                                 &psin6->sin6_addr);
 533                         /* prior join w/ different source is ok */
 534                         if (retv && retv != -EADDRINUSE)
 535                                 break;
 536                         omode = MCAST_INCLUDE;
 537                         add = 1;
 538                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 539                         omode = MCAST_INCLUDE;
 540                         add = 0;
 541                 }
 542                 retv = ip6_mc_source(add, omode, sk, &greqs);
 543                 break;
 544         }
 545         case MCAST_MSFILTER:
 546         {
 547                 extern int sysctl_mld_max_msf;
 548                 struct group_filter *gsf;
 549
 550                 if (optlen < GROUP_FILTER_SIZE(0))
 551                         goto e_inval;
 552                 if (optlen > sysctl_optmem_max) {
 553                         retv = -ENOBUFS;
 554                         break;
 555                 }
 556                 gsf = kmalloc(optlen,GFP_KERNEL);
 557                 if (!gsf) {
 558                         retv = -ENOBUFS;
 559                         break;
 560                 }
 561                 retv = -EFAULT;
 562                 if (copy_from_user(gsf, optval, optlen)) {
 563                         kfree(gsf);
 564                         break;
 565                 }
 566                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 567                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 568                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 569                         kfree(gsf);
 570                         retv = -ENOBUFS;
 571                         break;
 572                 }
 573                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 574                         kfree(gsf);
 575                         retv = -EINVAL;
 576                         break;
 577                 }
 578                 retv = ip6_mc_msfilter(sk, gsf);
 579                 kfree(gsf);
 580
 581                 break;
 582         }
 583         case IPV6_ROUTER_ALERT:
 584                 retv = ip6_ra_control(sk, val, NULL);
 585                 break;
 586         case IPV6_MTU_DISCOVER:
 587                 if (val<0 || val>3)
 588                         goto e_inval;
 589                 np->pmtudisc = val;
 590                 retv = 0;
 591                 break;
 592         case IPV6_MTU:
 593                 if (val && val < IPV6_MIN_MTU)
 594                         goto e_inval;
 595                 np->frag_size = val;
 596                 retv = 0;
 597                 break;
 598         case IPV6_RECVERR:
 599                 np->recverr = valbool;
 600                 if (!val)
 601                         skb_queue_purge(&sk->sk_error_queue);
 602                 retv = 0;
 603                 break;
 604         case IPV6_FLOWINFO_SEND:
 605                 np->sndflow = valbool;
 606                 retv = 0;
 607                 break;
 608         case IPV6_FLOWLABEL_MGR:
 609                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 610                 break;
 611         case IPV6_IPSEC_POLICY:
 612         case IPV6_XFRM_POLICY:
 613                 retv = -EPERM;
 614                 if (!capable(CAP_NET_ADMIN))
 615                         break;
 616                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 617                 break;
 618
 619         }
 620         release_sock(sk);
 621
 622         return retv;
 623
 624 e_inval:
 625         release_sock(sk);
 626         return -EINVAL;
 627 }
 628
 629 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 630                     char __user *optval, int optlen)
 631 {
 632         int err;
 633
 634         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 635                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 636
 637         if (level != SOL_IPV6)
 638                 return -ENOPROTOOPT;
 639
 640         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 641 #ifdef CONFIG_NETFILTER
 642         /* we need to exclude all possible ENOPROTOOPTs except default case */
 643         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 644                         optname != IPV6_XFRM_POLICY) {
 645                 lock_sock(sk);
 646                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 647                                 optlen);
 648                 release_sock(sk);
 649         }
 650 #endif
 651         return err;
 652 }
 653
 654 EXPORT_SYMBOL(ipv6_setsockopt);
 655
 656 #ifdef CONFIG_COMPAT
 657 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 658                            char __user *optval, int optlen)
 659 {
 660         int err;
 661
 662         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 663                 if (udp_prot.compat_setsockopt != NULL)
 664                         return udp_prot.compat_setsockopt(sk, level, optname,
 665                                                           optval, optlen);
 666                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 667         }
 668
 669         if (level != SOL_IPV6)
 670                 return -ENOPROTOOPT;
 671
 672         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 673 #ifdef CONFIG_NETFILTER
 674         /* we need to exclude all possible ENOPROTOOPTs except default case */
 675         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 676             optname != IPV6_XFRM_POLICY) {
 677                 lock_sock(sk);
 678                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 679                                            optval, optlen);
 680                 release_sock(sk);
 681         }
 682 #endif
 683         return err;
 684 }
 685
 686 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 687 #endif
 688
 689 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 690                                   int optname, char __user *optval, int len)
 691 {
 692         struct ipv6_opt_hdr *hdr;
 693
 694         if (!opt)
 695                 return 0;
 696
 697         switch(optname) {
 698         case IPV6_HOPOPTS:
 699                 hdr = opt->hopopt;
 700                 break;
 701         case IPV6_RTHDRDSTOPTS:
 702                 hdr = opt->dst0opt;
 703                 break;
 704         case IPV6_RTHDR:
 705                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 706                 break;
 707         case IPV6_DSTOPTS:
 708                 hdr = opt->dst1opt;
 709                 break;
 710         default:
 711                 return -EINVAL; /* should not happen */
 712         }
 713
 714         if (!hdr)
 715                 return 0;
 716
 717         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 718         if (copy_to_user(optval, hdr, len))
 719                 return -EFAULT;
 720         return ipv6_optlen(hdr);
 721 }
 722
 723 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 724                     char __user *optval, int __user *optlen)
 725 {
 726         struct ipv6_pinfo *np = inet6_sk(sk);
 727         int len;
 728         int val;
 729
 730         if (get_user(len, optlen))
 731                 return -EFAULT;
 732         switch (optname) {
 733         case IPV6_ADDRFORM:
 734                 if (sk->sk_protocol != IPPROTO_UDP &&
 735                     sk->sk_protocol != IPPROTO_UDPLITE &&
 736                     sk->sk_protocol != IPPROTO_TCP)
 737                         return -EINVAL;
 738                 if (sk->sk_state != TCP_ESTABLISHED)
 739                         return -ENOTCONN;
 740                 val = sk->sk_family;
 741                 break;
 742         case MCAST_MSFILTER:
 743         {
 744                 struct group_filter gsf;
 745                 int err;
 746
 747                 if (len < GROUP_FILTER_SIZE(0))
 748                         return -EINVAL;
 749                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 750                         return -EFAULT;
 751                 lock_sock(sk);
 752                 err = ip6_mc_msfget(sk, &gsf,
 753                         (struct group_filter __user *)optval, optlen);
 754                 release_sock(sk);
 755                 return err;
 756         }
 757
 758         case IPV6_2292PKTOPTIONS:
 759         {
 760                 struct msghdr msg;
 761                 struct sk_buff *skb;
 762
 763                 if (sk->sk_type != SOCK_STREAM)
 764                         return -ENOPROTOOPT;
 765
 766                 msg.msg_control = optval;
 767                 msg.msg_controllen = len;
 768                 msg.msg_flags = 0;
 769
 770                 lock_sock(sk);
 771                 skb = np->pktoptions;
 772                 if (skb)
 773                         atomic_inc(&skb->users);
 774                 release_sock(sk);
 775
 776                 if (skb) {
 777                         int err = datagram_recv_ctl(sk, &msg, skb);
 778                         kfree_skb(skb);
 779                         if (err)
 780                                 return err;
 781                 } else {
 782                         if (np->rxopt.bits.rxinfo) {
 783                                 struct in6_pktinfo src_info;
 784                                 src_info.ipi6_ifindex = np->mcast_oif;
 785                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 786                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 787                         }
 788                         if (np->rxopt.bits.rxhlim) {
 789                                 int hlim = np->mcast_hops;
 790                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 791                         }
 792                         if (np->rxopt.bits.rxoinfo) {
 793                                 struct in6_pktinfo src_info;
 794                                 src_info.ipi6_ifindex = np->mcast_oif;
 795                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 796                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 797                         }
 798                         if (np->rxopt.bits.rxohlim) {
 799                                 int hlim = np->mcast_hops;
 800                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 801                         }
 802                 }
 803                 len -= msg.msg_controllen;
 804                 return put_user(len, optlen);
 805         }
 806         case IPV6_MTU:
 807         {
 808                 struct dst_entry *dst;
 809                 val = 0;
 810                 lock_sock(sk);
 811                 dst = sk_dst_get(sk);
 812                 if (dst) {
 813                         val = dst_mtu(dst);
 814                         dst_release(dst);
 815                 }
 816                 release_sock(sk);
 817                 if (!val)
 818                         return -ENOTCONN;
 819                 break;
 820         }
 821
 822         case IPV6_V6ONLY:
 823                 val = np->ipv6only;
 824                 break;
 825
 826         case IPV6_RECVPKTINFO:
 827                 val = np->rxopt.bits.rxinfo;
 828                 break;
 829
 830         case IPV6_2292PKTINFO:
 831                 val = np->rxopt.bits.rxoinfo;
 832                 break;
 833
 834         case IPV6_RECVHOPLIMIT:
 835                 val = np->rxopt.bits.rxhlim;
 836                 break;
 837
 838         case IPV6_2292HOPLIMIT:
 839                 val = np->rxopt.bits.rxohlim;
 840                 break;
 841
 842         case IPV6_RECVRTHDR:
 843                 val = np->rxopt.bits.srcrt;
 844                 break;
 845
 846         case IPV6_2292RTHDR:
 847                 val = np->rxopt.bits.osrcrt;
 848                 break;
 849
 850         case IPV6_HOPOPTS:
 851         case IPV6_RTHDRDSTOPTS:
 852         case IPV6_RTHDR:
 853         case IPV6_DSTOPTS:
 854         {
 855
 856                 lock_sock(sk);
 857                 len = ipv6_getsockopt_sticky(sk, np->opt,
 858                                              optname, optval, len);
 859                 release_sock(sk);
 860                 return put_user(len, optlen);
 861         }
 862
 863         case IPV6_RECVHOPOPTS:
 864                 val = np->rxopt.bits.hopopts;
 865                 break;
 866
 867         case IPV6_2292HOPOPTS:
 868                 val = np->rxopt.bits.ohopopts;
 869                 break;
 870
 871         case IPV6_RECVDSTOPTS:
 872                 val = np->rxopt.bits.dstopts;
 873                 break;
 874
 875         case IPV6_2292DSTOPTS:
 876                 val = np->rxopt.bits.odstopts;
 877                 break;
 878
 879         case IPV6_TCLASS:
 880                 val = np->tclass;
 881                 if (val < 0)
 882                         val = 0;
 883                 break;
 884
 885         case IPV6_RECVTCLASS:
 886                 val = np->rxopt.bits.rxtclass;
 887                 break;
 888
 889         case IPV6_FLOWINFO:
 890                 val = np->rxopt.bits.rxflow;
 891                 break;
 892
 893         case IPV6_UNICAST_HOPS:
 894         case IPV6_MULTICAST_HOPS:
 895         {
 896                 struct dst_entry *dst;
 897
 898                 if (optname == IPV6_UNICAST_HOPS)
 899                         val = np->hop_limit;
 900                 else
 901                         val = np->mcast_hops;
 902
 903                 dst = sk_dst_get(sk);
 904                 if (dst) {
 905                         if (val < 0)
 906                                 val = dst_metric(dst, RTAX_HOPLIMIT);
 907                         if (val < 0)
 908                                 val = ipv6_get_hoplimit(dst->dev);
 909                         dst_release(dst);
 910                 }
 911                 if (val < 0)
 912                         val = ipv6_devconf.hop_limit;
 913                 break;
 914         }
 915
 916         case IPV6_MULTICAST_LOOP:
 917                 val = np->mc_loop;
 918                 break;
 919
 920         case IPV6_MULTICAST_IF:
 921                 val = np->mcast_oif;
 922                 break;
 923
 924         case IPV6_MTU_DISCOVER:
 925                 val = np->pmtudisc;
 926                 break;
 927
 928         case IPV6_RECVERR:
 929                 val = np->recverr;
 930                 break;
 931
 932         case IPV6_FLOWINFO_SEND:
 933                 val = np->sndflow;
 934                 break;
 935
 936         default:
 937                 return -ENOPROTOOPT;
 938         }
 939         len = min_t(unsigned int, sizeof(int), len);
 940         if(put_user(len, optlen))
 941                 return -EFAULT;
 942         if(copy_to_user(optval,&val,len))
 943                 return -EFAULT;
 944         return 0;
 945 }
 946
 947 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 948                     char __user *optval, int __user *optlen)
 949 {
 950         int err;
 951
 952         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 953                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 954
 955         if(level != SOL_IPV6)
 956                 return -ENOPROTOOPT;
 957
 958         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
 959 #ifdef CONFIG_NETFILTER
 960         /* we need to exclude all possible ENOPROTOOPTs except default case */
 961         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
 962                 int len;
 963
 964                 if (get_user(len, optlen))
 965                         return -EFAULT;
 966
 967                 lock_sock(sk);
 968                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
 969                                 &len);
 970                 release_sock(sk);
 971                 if (err >= 0)
 972                         err = put_user(len, optlen);
 973         }
 974 #endif
 975         return err;
 976 }
 977
 978 EXPORT_SYMBOL(ipv6_getsockopt);
 979
 980 #ifdef CONFIG_COMPAT
 981 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
 982                            char __user *optval, int __user *optlen)
 983 {
 984         int err;
 985
 986         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 987                 if (udp_prot.compat_getsockopt != NULL)
 988                         return udp_prot.compat_getsockopt(sk, level, optname,
 989                                                           optval, optlen);
 990                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 991         }
 992
 993         if (level != SOL_IPV6)
 994                 return -ENOPROTOOPT;
 995
 996         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
 997 #ifdef CONFIG_NETFILTER
 998         /* we need to exclude all possible ENOPROTOOPTs except default case */
 999         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1000                 int len;
1001
1002                 if (get_user(len, optlen))
1003                         return -EFAULT;
1004
1005                 lock_sock(sk);
1006                 err = compat_nf_getsockopt(sk, PF_INET6,
1007                                            optname, optval, &len);
1008                 release_sock(sk);
1009                 if (err >= 0)
1010                         err = put_user(len, optlen);
1011         }
1012 #endif
1013         return err;
1014 }
1015
1016 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1017 #endif
1018