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                         if (pktopt)
 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)->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                 np->tclass = val;
 320                 retv = 0;
 321                 break;
 322
 323         case IPV6_RECVTCLASS:
 324                 if (optlen < sizeof(int))
 325                         goto e_inval;
 326                 np->rxopt.bits.rxtclass = valbool;
 327                 retv = 0;
 328                 break;
 329
 330         case IPV6_FLOWINFO:
 331                 if (optlen < sizeof(int))
 332                         goto e_inval;
 333                 np->rxopt.bits.rxflow = valbool;
 334                 retv = 0;
 335                 break;
 336
 337         case IPV6_HOPOPTS:
 338         case IPV6_RTHDRDSTOPTS:
 339         case IPV6_RTHDR:
 340         case IPV6_DSTOPTS:
 341         {
 342                 struct ipv6_txoptions *opt;
 343
 344                 /* remove any sticky options header with a zero option
 345                  * length, per RFC3542.
 346                  */
 347                 if (optlen == 0)
 348                         optval = NULL;
 349                 else if (optval == NULL)
 350                         goto e_inval;
 351                 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 352                          optlen & 0x7 || optlen > 8 * 255)
 353                         goto e_inval;
 354
 355                 /* hop-by-hop / destination options are privileged option */
 356                 retv = -EPERM;
 357                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 358                         break;
 359
 360                 opt = ipv6_renew_options(sk, np->opt, optname,
 361                                          (struct ipv6_opt_hdr __user *)optval,
 362                                          optlen);
 363                 if (IS_ERR(opt)) {
 364                         retv = PTR_ERR(opt);
 365                         break;
 366                 }
 367
 368                 /* routing header option needs extra check */
 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                                 break;
 375 #endif
 376                         default:
 377                                 goto sticky_done;
 378                         }
 379
 380                         if ((rthdr->hdrlen & 1) ||
 381                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 382                                 goto sticky_done;
 383                 }
 384
 385                 retv = 0;
 386                 opt = ipv6_update_options(sk, opt);
 387 sticky_done:
 388                 if (opt)
 389                         sock_kfree_s(sk, opt, opt->tot_len);
 390                 break;
 391         }
 392
 393         case IPV6_2292PKTOPTIONS:
 394         {
 395                 struct ipv6_txoptions *opt = NULL;
 396                 struct msghdr msg;
 397                 struct flowi fl;
 398                 int junk;
 399
 400                 fl.fl6_flowlabel = 0;
 401                 fl.oif = sk->sk_bound_dev_if;
 402
 403                 if (optlen == 0)
 404                         goto update;
 405
 406                 /* 1K is probably excessive
 407                  * 1K is surely not enough, 2K per standard header is 16K.
 408                  */
 409                 retv = -EINVAL;
 410                 if (optlen > 64*1024)
 411                         break;
 412
 413                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 414                 retv = -ENOBUFS;
 415                 if (opt == NULL)
 416                         break;
 417
 418                 memset(opt, 0, sizeof(*opt));
 419                 opt->tot_len = sizeof(*opt) + optlen;
 420                 retv = -EFAULT;
 421                 if (copy_from_user(opt+1, optval, optlen))
 422                         goto done;
 423
 424                 msg.msg_controllen = optlen;
 425                 msg.msg_control = (void*)(opt+1);
 426
 427                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
 428                 if (retv)
 429                         goto done;
 430 update:
 431                 retv = 0;
 432                 opt = ipv6_update_options(sk, opt);
 433 done:
 434                 if (opt)
 435                         sock_kfree_s(sk, opt, opt->tot_len);
 436                 break;
 437         }
 438         case IPV6_UNICAST_HOPS:
 439                 if (optlen < sizeof(int))
 440                         goto e_inval;
 441                 if (val > 255 || val < -1)
 442                         goto e_inval;
 443                 np->hop_limit = val;
 444                 retv = 0;
 445                 break;
 446
 447         case IPV6_MULTICAST_HOPS:
 448                 if (sk->sk_type == SOCK_STREAM)
 449                         break;
 450                 if (optlen < sizeof(int))
 451                         goto e_inval;
 452                 if (val > 255 || val < -1)
 453                         goto e_inval;
 454                 np->mcast_hops = val;
 455                 retv = 0;
 456                 break;
 457
 458         case IPV6_MULTICAST_LOOP:
 459                 if (optlen < sizeof(int))
 460                         goto e_inval;
 461                 if (val != valbool)
 462                         goto e_inval;
 463                 np->mc_loop = valbool;
 464                 retv = 0;
 465                 break;
 466
 467         case IPV6_MULTICAST_IF:
 468                 if (sk->sk_type == SOCK_STREAM)
 469                         break;
 470                 if (optlen < sizeof(int))
 471                         goto e_inval;
 472
 473                 if (val) {
 474                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 475                                 goto e_inval;
 476
 477                         if (__dev_get_by_index(net, val) == NULL) {
 478                                 retv = -ENODEV;
 479                                 break;
 480                         }
 481                 }
 482                 np->mcast_oif = val;
 483                 retv = 0;
 484                 break;
 485         case IPV6_ADD_MEMBERSHIP:
 486         case IPV6_DROP_MEMBERSHIP:
 487         {
 488                 struct ipv6_mreq mreq;
 489
 490                 if (optlen < sizeof(struct ipv6_mreq))
 491                         goto e_inval;
 492
 493                 retv = -EPROTO;
 494                 if (inet_sk(sk)->is_icsk)
 495                         break;
 496
 497                 retv = -EFAULT;
 498                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 499                         break;
 500
 501                 if (optname == IPV6_ADD_MEMBERSHIP)
 502                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 503                 else
 504                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 505                 break;
 506         }
 507         case IPV6_JOIN_ANYCAST:
 508         case IPV6_LEAVE_ANYCAST:
 509         {
 510                 struct ipv6_mreq mreq;
 511
 512                 if (optlen < sizeof(struct ipv6_mreq))
 513                         goto e_inval;
 514
 515                 retv = -EFAULT;
 516                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 517                         break;
 518
 519                 if (optname == IPV6_JOIN_ANYCAST)
 520                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 521                 else
 522                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 523                 break;
 524         }
 525         case MCAST_JOIN_GROUP:
 526         case MCAST_LEAVE_GROUP:
 527         {
 528                 struct group_req greq;
 529                 struct sockaddr_in6 *psin6;
 530
 531                 if (optlen < sizeof(struct group_req))
 532                         goto e_inval;
 533
 534                 retv = -EFAULT;
 535                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 536                         break;
 537                 if (greq.gr_group.ss_family != AF_INET6) {
 538                         retv = -EADDRNOTAVAIL;
 539                         break;
 540                 }
 541                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 542                 if (optname == MCAST_JOIN_GROUP)
 543                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 544                                 &psin6->sin6_addr);
 545                 else
 546                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 547                                 &psin6->sin6_addr);
 548                 break;
 549         }
 550         case MCAST_JOIN_SOURCE_GROUP:
 551         case MCAST_LEAVE_SOURCE_GROUP:
 552         case MCAST_BLOCK_SOURCE:
 553         case MCAST_UNBLOCK_SOURCE:
 554         {
 555                 struct group_source_req greqs;
 556                 int omode, add;
 557
 558                 if (optlen < sizeof(struct group_source_req))
 559                         goto e_inval;
 560                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 561                         retv = -EFAULT;
 562                         break;
 563                 }
 564                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 565                     greqs.gsr_source.ss_family != AF_INET6) {
 566                         retv = -EADDRNOTAVAIL;
 567                         break;
 568                 }
 569                 if (optname == MCAST_BLOCK_SOURCE) {
 570                         omode = MCAST_EXCLUDE;
 571                         add = 1;
 572                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 573                         omode = MCAST_EXCLUDE;
 574                         add = 0;
 575                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 576                         struct sockaddr_in6 *psin6;
 577
 578                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 579                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 580                                 &psin6->sin6_addr);
 581                         /* prior join w/ different source is ok */
 582                         if (retv && retv != -EADDRINUSE)
 583                                 break;
 584                         omode = MCAST_INCLUDE;
 585                         add = 1;
 586                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 587                         omode = MCAST_INCLUDE;
 588                         add = 0;
 589                 }
 590                 retv = ip6_mc_source(add, omode, sk, &greqs);
 591                 break;
 592         }
 593         case MCAST_MSFILTER:
 594         {
 595                 extern int sysctl_mld_max_msf;
 596                 struct group_filter *gsf;
 597
 598                 if (optlen < GROUP_FILTER_SIZE(0))
 599                         goto e_inval;
 600                 if (optlen > sysctl_optmem_max) {
 601                         retv = -ENOBUFS;
 602                         break;
 603                 }
 604                 gsf = kmalloc(optlen,GFP_KERNEL);
 605                 if (!gsf) {
 606                         retv = -ENOBUFS;
 607                         break;
 608                 }
 609                 retv = -EFAULT;
 610                 if (copy_from_user(gsf, optval, optlen)) {
 611                         kfree(gsf);
 612                         break;
 613                 }
 614                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 615                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 616                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 617                         kfree(gsf);
 618                         retv = -ENOBUFS;
 619                         break;
 620                 }
 621                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 622                         kfree(gsf);
 623                         retv = -EINVAL;
 624                         break;
 625                 }
 626                 retv = ip6_mc_msfilter(sk, gsf);
 627                 kfree(gsf);
 628
 629                 break;
 630         }
 631         case IPV6_ROUTER_ALERT:
 632                 if (optlen < sizeof(int))
 633                         goto e_inval;
 634                 retv = ip6_ra_control(sk, val);
 635                 break;
 636         case IPV6_MTU_DISCOVER:
 637                 if (optlen < sizeof(int))
 638                         goto e_inval;
 639                 if (val<0 || val>3)
 640                         goto e_inval;
 641                 np->pmtudisc = val;
 642                 retv = 0;
 643                 break;
 644         case IPV6_MTU:
 645                 if (optlen < sizeof(int))
 646                         goto e_inval;
 647                 if (val && val < IPV6_MIN_MTU)
 648                         goto e_inval;
 649                 np->frag_size = val;
 650                 retv = 0;
 651                 break;
 652         case IPV6_RECVERR:
 653                 if (optlen < sizeof(int))
 654                         goto e_inval;
 655                 np->recverr = valbool;
 656                 if (!val)
 657                         skb_queue_purge(&sk->sk_error_queue);
 658                 retv = 0;
 659                 break;
 660         case IPV6_FLOWINFO_SEND:
 661                 if (optlen < sizeof(int))
 662                         goto e_inval;
 663                 np->sndflow = valbool;
 664                 retv = 0;
 665                 break;
 666         case IPV6_FLOWLABEL_MGR:
 667                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 668                 break;
 669         case IPV6_IPSEC_POLICY:
 670         case IPV6_XFRM_POLICY:
 671                 retv = -EPERM;
 672                 if (!capable(CAP_NET_ADMIN))
 673                         break;
 674                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 675                 break;
 676
 677         case IPV6_ADDR_PREFERENCES:
 678             {
 679                 unsigned int pref = 0;
 680                 unsigned int prefmask = ~0;
 681
 682                 if (optlen < sizeof(int))
 683                         goto e_inval;
 684
 685                 retv = -EINVAL;
 686
 687                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 688                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 689                                IPV6_PREFER_SRC_TMP|
 690                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 691                 case IPV6_PREFER_SRC_PUBLIC:
 692                         pref |= IPV6_PREFER_SRC_PUBLIC;
 693                         break;
 694                 case IPV6_PREFER_SRC_TMP:
 695                         pref |= IPV6_PREFER_SRC_TMP;
 696                         break;
 697                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 698                         break;
 699                 case 0:
 700                         goto pref_skip_pubtmp;
 701                 default:
 702                         goto e_inval;
 703                 }
 704
 705                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 706                               IPV6_PREFER_SRC_TMP);
 707 pref_skip_pubtmp:
 708
 709                 /* check HOME/COA conflicts */
 710                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 711                 case IPV6_PREFER_SRC_HOME:
 712                         break;
 713                 case IPV6_PREFER_SRC_COA:
 714                         pref |= IPV6_PREFER_SRC_COA;
 715                 case 0:
 716                         goto pref_skip_coa;
 717                 default:
 718                         goto e_inval;
 719                 }
 720
 721                 prefmask &= ~IPV6_PREFER_SRC_COA;
 722 pref_skip_coa:
 723
 724                 /* check CGA/NONCGA conflicts */
 725                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 726                 case IPV6_PREFER_SRC_CGA:
 727                 case IPV6_PREFER_SRC_NONCGA:
 728                 case 0:
 729                         break;
 730                 default:
 731                         goto e_inval;
 732                 }
 733
 734                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 735                 retv = 0;
 736
 737                 break;
 738             }
 739         }
 740
 741         release_sock(sk);
 742
 743         return retv;
 744
 745 e_inval:
 746         release_sock(sk);
 747         return -EINVAL;
 748 }
 749
 750 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 751                     char __user *optval, int optlen)
 752 {
 753         int err;
 754
 755         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 756                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 757
 758         if (level != SOL_IPV6)
 759                 return -ENOPROTOOPT;
 760
 761         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 762 #ifdef CONFIG_NETFILTER
 763         /* we need to exclude all possible ENOPROTOOPTs except default case */
 764         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 765                         optname != IPV6_XFRM_POLICY) {
 766                 lock_sock(sk);
 767                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 768                                 optlen);
 769                 release_sock(sk);
 770         }
 771 #endif
 772         return err;
 773 }
 774
 775 EXPORT_SYMBOL(ipv6_setsockopt);
 776
 777 #ifdef CONFIG_COMPAT
 778 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 779                            char __user *optval, int optlen)
 780 {
 781         int err;
 782
 783         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 784                 if (udp_prot.compat_setsockopt != NULL)
 785                         return udp_prot.compat_setsockopt(sk, level, optname,
 786                                                           optval, optlen);
 787                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 788         }
 789
 790         if (level != SOL_IPV6)
 791                 return -ENOPROTOOPT;
 792
 793         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 794                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 795                         ipv6_setsockopt);
 796
 797         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 798 #ifdef CONFIG_NETFILTER
 799         /* we need to exclude all possible ENOPROTOOPTs except default case */
 800         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 801             optname != IPV6_XFRM_POLICY) {
 802                 lock_sock(sk);
 803                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 804                                            optval, optlen);
 805                 release_sock(sk);
 806         }
 807 #endif
 808         return err;
 809 }
 810
 811 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 812 #endif
 813
 814 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 815                                   int optname, char __user *optval, int len)
 816 {
 817         struct ipv6_opt_hdr *hdr;
 818
 819         if (!opt)
 820                 return 0;
 821
 822         switch(optname) {
 823         case IPV6_HOPOPTS:
 824                 hdr = opt->hopopt;
 825                 break;
 826         case IPV6_RTHDRDSTOPTS:
 827                 hdr = opt->dst0opt;
 828                 break;
 829         case IPV6_RTHDR:
 830                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 831                 break;
 832         case IPV6_DSTOPTS:
 833                 hdr = opt->dst1opt;
 834                 break;
 835         default:
 836                 return -EINVAL; /* should not happen */
 837         }
 838
 839         if (!hdr)
 840                 return 0;
 841
 842         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 843         if (copy_to_user(optval, hdr, len))
 844                 return -EFAULT;
 845         return len;
 846 }
 847
 848 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 849                     char __user *optval, int __user *optlen)
 850 {
 851         struct ipv6_pinfo *np = inet6_sk(sk);
 852         int len;
 853         int val;
 854
 855         if (ip6_mroute_opt(optname))
 856                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 857
 858         if (get_user(len, optlen))
 859                 return -EFAULT;
 860         switch (optname) {
 861         case IPV6_ADDRFORM:
 862                 if (sk->sk_protocol != IPPROTO_UDP &&
 863                     sk->sk_protocol != IPPROTO_UDPLITE &&
 864                     sk->sk_protocol != IPPROTO_TCP)
 865                         return -ENOPROTOOPT;
 866                 if (sk->sk_state != TCP_ESTABLISHED)
 867                         return -ENOTCONN;
 868                 val = sk->sk_family;
 869                 break;
 870         case MCAST_MSFILTER:
 871         {
 872                 struct group_filter gsf;
 873                 int err;
 874
 875                 if (len < GROUP_FILTER_SIZE(0))
 876                         return -EINVAL;
 877                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 878                         return -EFAULT;
 879                 if (gsf.gf_group.ss_family != AF_INET6)
 880                         return -EADDRNOTAVAIL;
 881                 lock_sock(sk);
 882                 err = ip6_mc_msfget(sk, &gsf,
 883                         (struct group_filter __user *)optval, optlen);
 884                 release_sock(sk);
 885                 return err;
 886         }
 887
 888         case IPV6_2292PKTOPTIONS:
 889         {
 890                 struct msghdr msg;
 891                 struct sk_buff *skb;
 892
 893                 if (sk->sk_type != SOCK_STREAM)
 894                         return -ENOPROTOOPT;
 895
 896                 msg.msg_control = optval;
 897                 msg.msg_controllen = len;
 898                 msg.msg_flags = 0;
 899
 900                 lock_sock(sk);
 901                 skb = np->pktoptions;
 902                 if (skb)
 903                         atomic_inc(&skb->users);
 904                 release_sock(sk);
 905
 906                 if (skb) {
 907                         int err = datagram_recv_ctl(sk, &msg, skb);
 908                         kfree_skb(skb);
 909                         if (err)
 910                                 return err;
 911                 } else {
 912                         if (np->rxopt.bits.rxinfo) {
 913                                 struct in6_pktinfo src_info;
 914                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : sk->sk_bound_dev_if;
 915                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 916                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 917                         }
 918                         if (np->rxopt.bits.rxhlim) {
 919                                 int hlim = np->mcast_hops;
 920                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 921                         }
 922                         if (np->rxopt.bits.rxoinfo) {
 923                                 struct in6_pktinfo src_info;
 924                                 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : sk->sk_bound_dev_if;
 925                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 926                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 927                         }
 928                         if (np->rxopt.bits.rxohlim) {
 929                                 int hlim = np->mcast_hops;
 930                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 931                         }
 932                 }
 933                 len -= msg.msg_controllen;
 934                 return put_user(len, optlen);
 935         }
 936         case IPV6_MTU:
 937         {
 938                 struct dst_entry *dst;
 939                 val = 0;
 940                 lock_sock(sk);
 941                 dst = sk_dst_get(sk);
 942                 if (dst) {
 943                         val = dst_mtu(dst);
 944                         dst_release(dst);
 945                 }
 946                 release_sock(sk);
 947                 if (!val)
 948                         return -ENOTCONN;
 949                 break;
 950         }
 951
 952         case IPV6_V6ONLY:
 953                 val = np->ipv6only;
 954                 break;
 955
 956         case IPV6_RECVPKTINFO:
 957                 val = np->rxopt.bits.rxinfo;
 958                 break;
 959
 960         case IPV6_2292PKTINFO:
 961                 val = np->rxopt.bits.rxoinfo;
 962                 break;
 963
 964         case IPV6_RECVHOPLIMIT:
 965                 val = np->rxopt.bits.rxhlim;
 966                 break;
 967
 968         case IPV6_2292HOPLIMIT:
 969                 val = np->rxopt.bits.rxohlim;
 970                 break;
 971
 972         case IPV6_RECVRTHDR:
 973                 val = np->rxopt.bits.srcrt;
 974                 break;
 975
 976         case IPV6_2292RTHDR:
 977                 val = np->rxopt.bits.osrcrt;
 978                 break;
 979
 980         case IPV6_HOPOPTS:
 981         case IPV6_RTHDRDSTOPTS:
 982         case IPV6_RTHDR:
 983         case IPV6_DSTOPTS:
 984         {
 985
 986                 lock_sock(sk);
 987                 len = ipv6_getsockopt_sticky(sk, np->opt,
 988                                              optname, optval, len);
 989                 release_sock(sk);
 990                 /* check if ipv6_getsockopt_sticky() returns err code */
 991                 if (len < 0)
 992                         return len;
 993                 return put_user(len, optlen);
 994         }
 995
 996         case IPV6_RECVHOPOPTS:
 997                 val = np->rxopt.bits.hopopts;
 998                 break;
 999
1000         case IPV6_2292HOPOPTS:
1001                 val = np->rxopt.bits.ohopopts;
1002                 break;
1003
1004         case IPV6_RECVDSTOPTS:
1005                 val = np->rxopt.bits.dstopts;
1006                 break;
1007
1008         case IPV6_2292DSTOPTS:
1009                 val = np->rxopt.bits.odstopts;
1010                 break;
1011
1012         case IPV6_TCLASS:
1013                 val = np->tclass;
1014                 if (val < 0)
1015                         val = 0;
1016                 break;
1017
1018         case IPV6_RECVTCLASS:
1019                 val = np->rxopt.bits.rxtclass;
1020                 break;
1021
1022         case IPV6_FLOWINFO:
1023                 val = np->rxopt.bits.rxflow;
1024                 break;
1025
1026         case IPV6_UNICAST_HOPS:
1027         case IPV6_MULTICAST_HOPS:
1028         {
1029                 struct dst_entry *dst;
1030
1031                 if (optname == IPV6_UNICAST_HOPS)
1032                         val = np->hop_limit;
1033                 else
1034                         val = np->mcast_hops;
1035
1036                 dst = sk_dst_get(sk);
1037                 if (dst) {
1038                         if (val < 0)
1039                                 val = ip6_dst_hoplimit(dst);
1040                         dst_release(dst);
1041                 }
1042                 if (val < 0)
1043                         val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1044                 break;
1045         }
1046
1047         case IPV6_MULTICAST_LOOP:
1048                 val = np->mc_loop;
1049                 break;
1050
1051         case IPV6_MULTICAST_IF:
1052                 val = np->mcast_oif;
1053                 break;
1054
1055         case IPV6_MTU_DISCOVER:
1056                 val = np->pmtudisc;
1057                 break;
1058
1059         case IPV6_RECVERR:
1060                 val = np->recverr;
1061                 break;
1062
1063         case IPV6_FLOWINFO_SEND:
1064                 val = np->sndflow;
1065                 break;
1066
1067         case IPV6_ADDR_PREFERENCES:
1068                 val = 0;
1069
1070                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1071                         val |= IPV6_PREFER_SRC_TMP;
1072                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1073                         val |= IPV6_PREFER_SRC_PUBLIC;
1074                 else {
1075                         /* XXX: should we return system default? */
1076                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1077                 }
1078
1079                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1080                         val |= IPV6_PREFER_SRC_COA;
1081                 else
1082                         val |= IPV6_PREFER_SRC_HOME;
1083                 break;
1084
1085         default:
1086                 return -ENOPROTOOPT;
1087         }
1088         len = min_t(unsigned int, sizeof(int), len);
1089         if(put_user(len, optlen))
1090                 return -EFAULT;
1091         if(copy_to_user(optval,&val,len))
1092                 return -EFAULT;
1093         return 0;
1094 }
1095
1096 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1097                     char __user *optval, int __user *optlen)
1098 {
1099         int err;
1100
1101         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1102                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1103
1104         if(level != SOL_IPV6)
1105                 return -ENOPROTOOPT;
1106
1107         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1108 #ifdef CONFIG_NETFILTER
1109         /* we need to exclude all possible ENOPROTOOPTs except default case */
1110         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1111                 int len;
1112
1113                 if (get_user(len, optlen))
1114                         return -EFAULT;
1115
1116                 lock_sock(sk);
1117                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1118                                 &len);
1119                 release_sock(sk);
1120                 if (err >= 0)
1121                         err = put_user(len, optlen);
1122         }
1123 #endif
1124         return err;
1125 }
1126
1127 EXPORT_SYMBOL(ipv6_getsockopt);
1128
1129 #ifdef CONFIG_COMPAT
1130 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1131                            char __user *optval, int __user *optlen)
1132 {
1133         int err;
1134
1135         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1136                 if (udp_prot.compat_getsockopt != NULL)
1137                         return udp_prot.compat_getsockopt(sk, level, optname,
1138                                                           optval, optlen);
1139                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1140         }
1141
1142         if (level != SOL_IPV6)
1143                 return -ENOPROTOOPT;
1144
1145         if (optname == MCAST_MSFILTER)
1146                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1147                         ipv6_getsockopt);
1148
1149         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1150 #ifdef CONFIG_NETFILTER
1151         /* we need to exclude all possible ENOPROTOOPTs except default case */
1152         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1153                 int len;
1154
1155                 if (get_user(len, optlen))
1156                         return -EFAULT;
1157
1158                 lock_sock(sk);
1159                 err = compat_nf_getsockopt(sk, PF_INET6,
1160                                            optname, optval, &len);
1161                 release_sock(sk);
1162                 if (err >= 0)
1163                         err = put_user(len, optlen);
1164         }
1165 #endif
1166         return err;
1167 }
1168
1169 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1170 #endif
1171