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  *      $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       Truncate getsockopt returns
  20  *      o       Return an optlen of the truncated length if need be
  21  *
  22  *      Changes:
  23  *      David L Stevens <dlstevens@us.ibm.com>:
  24  *              - added multicast source filtering API for MLDv2
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/capability.h>
  29 #include <linux/errno.h>
  30 #include <linux/types.h>
  31 #include <linux/socket.h>
  32 #include <linux/sockios.h>
  33 #include <linux/net.h>
  34 #include <linux/in6.h>
  35 #include <linux/mroute6.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 #include <net/compat.h>
  56
  57 #include <asm/uaccess.h>
  58
  59 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  60
  61 struct ip6_ra_chain *ip6_ra_chain;
  62 DEFINE_RWLOCK(ip6_ra_lock);
  63
  64 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
  65 {
  66         struct ip6_ra_chain *ra, *new_ra, **rap;
  67
  68         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  69         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
  70                 return -ENOPROTOOPT;
  71
  72         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  73
  74         write_lock_bh(&ip6_ra_lock);
  75         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  76                 if (ra->sk == sk) {
  77                         if (sel>=0) {
  78                                 write_unlock_bh(&ip6_ra_lock);
  79                                 kfree(new_ra);
  80                                 return -EADDRINUSE;
  81                         }
  82
  83                         *rap = ra->next;
  84                         write_unlock_bh(&ip6_ra_lock);
  85
  86                         if (ra->destructor)
  87                                 ra->destructor(sk);
  88                         sock_put(sk);
  89                         kfree(ra);
  90                         return 0;
  91                 }
  92         }
  93         if (new_ra == NULL) {
  94                 write_unlock_bh(&ip6_ra_lock);
  95                 return -ENOBUFS;
  96         }
  97         new_ra->sk = sk;
  98         new_ra->sel = sel;
  99         new_ra->destructor = destructor;
 100         new_ra->next = ra;
 101         *rap = new_ra;
 102         sock_hold(sk);
 103         write_unlock_bh(&ip6_ra_lock);
 104         return 0;
 105 }
 106
 107 static
 108 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 109                                            struct ipv6_txoptions *opt)
 110 {
 111         if (inet_sk(sk)->is_icsk) {
 112                 if (opt &&
 113                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 114                     inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 115                         struct inet_connection_sock *icsk = inet_csk(sk);
 116                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 117                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 118                 }
 119                 opt = xchg(&inet6_sk(sk)->opt, opt);
 120         } else {
 121                 write_lock(&sk->sk_dst_lock);
 122                 opt = xchg(&inet6_sk(sk)->opt, opt);
 123                 write_unlock(&sk->sk_dst_lock);
 124         }
 125         sk_dst_reset(sk);
 126
 127         return opt;
 128 }
 129
 130 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 131                     char __user *optval, int optlen)
 132 {
 133         struct ipv6_pinfo *np = inet6_sk(sk);
 134         struct net *net = sock_net(sk);
 135         int val, valbool;
 136         int retv = -ENOPROTOOPT;
 137
 138         if (optval == NULL)
 139                 val=0;
 140         else {
 141                 if (optlen >= sizeof(int)) {
 142                         if (get_user(val, (int __user *) optval))
 143                                 return -EFAULT;
 144                 } else
 145                         val = 0;
 146         }
 147
 148         valbool = (val!=0);
 149
 150         if (ip6_mroute_opt(optname))
 151                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 152
 153         lock_sock(sk);
 154
 155         switch (optname) {
 156
 157         case IPV6_ADDRFORM:
 158                 if (optlen < sizeof(int))
 159                         goto e_inval;
 160                 if (val == PF_INET) {
 161                         struct ipv6_txoptions *opt;
 162                         struct sk_buff *pktopt;
 163
 164                         if (sk->sk_type == SOCK_RAW)
 165                                 break;
 166
 167                         if (sk->sk_protocol == IPPROTO_UDP ||
 168                             sk->sk_protocol == IPPROTO_UDPLITE) {
 169                                 struct udp_sock *up = udp_sk(sk);
 170                                 if (up->pending == AF_INET6) {
 171                                         retv = -EBUSY;
 172                                         break;
 173                                 }
 174                         } else if (sk->sk_protocol != IPPROTO_TCP)
 175                                 break;
 176
 177                         if (sk->sk_state != TCP_ESTABLISHED) {
 178                                 retv = -ENOTCONN;
 179                                 break;
 180                         }
 181
 182                         if (ipv6_only_sock(sk) ||
 183                             !ipv6_addr_v4mapped(&np->daddr)) {
 184                                 retv = -EADDRNOTAVAIL;
 185                                 break;
 186                         }
 187
 188                         fl6_free_socklist(sk);
 189                         ipv6_sock_mc_close(sk);
 190
 191                         /*
 192                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 193                          * remove it from the refcnt debug socks count in the
 194                          * original family...
 195                          */
 196                         sk_refcnt_debug_dec(sk);
 197
 198                         if (sk->sk_protocol == IPPROTO_TCP) {
 199                                 struct inet_connection_sock *icsk = inet_csk(sk);
 200                                 local_bh_disable();
 201                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 202                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 203                                 local_bh_enable();
 204                                 sk->sk_prot = &tcp_prot;
 205                                 icsk->icsk_af_ops = &ipv4_specific;
 206                                 sk->sk_socket->ops = &inet_stream_ops;
 207                                 sk->sk_family = PF_INET;
 208                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 209                         } else {
 210                                 struct proto *prot = &udp_prot;
 211
 212                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 213                                         prot = &udplite_prot;
 214                                 local_bh_disable();
 215                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 216                                 sock_prot_inuse_add(net, prot, 1);
 217                                 local_bh_enable();
 218                                 sk->sk_prot = prot;
 219                                 sk->sk_socket->ops = &inet_dgram_ops;
 220                                 sk->sk_family = PF_INET;
 221                         }
 222                         opt = xchg(&np->opt, NULL);
 223                         if (opt)
 224                                 sock_kfree_s(sk, opt, opt->tot_len);
 225                         pktopt = xchg(&np->pktoptions, NULL);
 226                         if (pktopt)
 227                                 kfree_skb(pktopt);
 228
 229                         sk->sk_destruct = inet_sock_destruct;
 230                         /*
 231                          * ... and add it to the refcnt debug socks count
 232                          * in the new family. -acme
 233                          */
 234                         sk_refcnt_debug_inc(sk);
 235                         module_put(THIS_MODULE);
 236                         retv = 0;
 237                         break;
 238                 }
 239                 goto e_inval;
 240
 241         case IPV6_V6ONLY:
 242                 if (optlen < sizeof(int) ||
 243                     inet_sk(sk)->num)
 244                         goto e_inval;
 245                 np->ipv6only = valbool;
 246                 retv = 0;
 247                 break;
 248
 249         case IPV6_RECVPKTINFO:
 250                 if (optlen < sizeof(int))
 251                         goto e_inval;
 252                 np->rxopt.bits.rxinfo = valbool;
 253                 retv = 0;
 254                 break;
 255
 256         case IPV6_2292PKTINFO:
 257                 if (optlen < sizeof(int))
 258                         goto e_inval;
 259                 np->rxopt.bits.rxoinfo = valbool;
 260                 retv = 0;
 261                 break;
 262
 263         case IPV6_RECVHOPLIMIT:
 264                 if (optlen < sizeof(int))
 265                         goto e_inval;
 266                 np->rxopt.bits.rxhlim = valbool;
 267                 retv = 0;
 268                 break;
 269
 270         case IPV6_2292HOPLIMIT:
 271                 if (optlen < sizeof(int))
 272                         goto e_inval;
 273                 np->rxopt.bits.rxohlim = valbool;
 274                 retv = 0;
 275                 break;
 276
 277         case IPV6_RECVRTHDR:
 278                 if (optlen < sizeof(int))
 279                         goto e_inval;
 280                 np->rxopt.bits.srcrt = valbool;
 281                 retv = 0;
 282                 break;
 283
 284         case IPV6_2292RTHDR:
 285                 if (optlen < sizeof(int))
 286                         goto e_inval;
 287                 np->rxopt.bits.osrcrt = valbool;
 288                 retv = 0;
 289                 break;
 290
 291         case IPV6_RECVHOPOPTS:
 292                 if (optlen < sizeof(int))
 293                         goto e_inval;
 294                 np->rxopt.bits.hopopts = valbool;
 295                 retv = 0;
 296                 break;
 297
 298         case IPV6_2292HOPOPTS:
 299                 if (optlen < sizeof(int))
 300                         goto e_inval;
 301                 np->rxopt.bits.ohopopts = valbool;
 302                 retv = 0;
 303                 break;
 304
 305         case IPV6_RECVDSTOPTS:
 306                 if (optlen < sizeof(int))
 307                         goto e_inval;
 308                 np->rxopt.bits.dstopts = valbool;
 309                 retv = 0;
 310                 break;
 311
 312         case IPV6_2292DSTOPTS:
 313                 if (optlen < sizeof(int))
 314                         goto e_inval;
 315                 np->rxopt.bits.odstopts = valbool;
 316                 retv = 0;
 317                 break;
 318
 319         case IPV6_TCLASS:
 320                 if (optlen < sizeof(int))
 321                         goto e_inval;
 322                 if (val < -1 || val > 0xff)
 323                         goto e_inval;
 324                 np->tclass = val;
 325                 retv = 0;
 326                 break;
 327
 328         case IPV6_RECVTCLASS:
 329                 if (optlen < sizeof(int))
 330                         goto e_inval;
 331                 np->rxopt.bits.rxtclass = valbool;
 332                 retv = 0;
 333                 break;
 334
 335         case IPV6_FLOWINFO:
 336                 if (optlen < sizeof(int))
 337                         goto e_inval;
 338                 np->rxopt.bits.rxflow = valbool;
 339                 retv = 0;
 340                 break;
 341
 342         case IPV6_HOPOPTS:
 343         case IPV6_RTHDRDSTOPTS:
 344         case IPV6_RTHDR:
 345         case IPV6_DSTOPTS:
 346         {
 347                 struct ipv6_txoptions *opt;
 348
 349                 /* remove any sticky options header with a zero option
 350                  * length, per RFC3542.
 351                  */
 352                 if (optlen == 0)
 353                         optval = NULL;
 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                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 373                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 374                         switch (rthdr->type) {
 375 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 376                         case IPV6_SRCRT_TYPE_2:
 377                                 break;
 378 #endif
 379                         default:
 380                                 goto sticky_done;
 381                         }
 382
 383                         if ((rthdr->hdrlen & 1) ||
 384                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 385                                 goto sticky_done;
 386                 }
 387
 388                 retv = 0;
 389                 opt = ipv6_update_options(sk, opt);
 390 sticky_done:
 391                 if (opt)
 392                         sock_kfree_s(sk, opt, opt->tot_len);
 393                 break;
 394         }
 395
 396         case IPV6_2292PKTOPTIONS:
 397         {
 398                 struct ipv6_txoptions *opt = NULL;
 399                 struct msghdr msg;
 400                 struct flowi fl;
 401                 int junk;
 402
 403                 fl.fl6_flowlabel = 0;
 404                 fl.oif = sk->sk_bound_dev_if;
 405
 406                 if (optlen == 0)
 407                         goto update;
 408
 409                 /* 1K is probably excessive
 410                  * 1K is surely not enough, 2K per standard header is 16K.
 411                  */
 412                 retv = -EINVAL;
 413                 if (optlen > 64*1024)
 414                         break;
 415
 416                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 417                 retv = -ENOBUFS;
 418                 if (opt == NULL)
 419                         break;
 420
 421                 memset(opt, 0, sizeof(*opt));
 422                 opt->tot_len = sizeof(*opt) + optlen;
 423                 retv = -EFAULT;
 424                 if (copy_from_user(opt+1, optval, optlen))
 425                         goto done;
 426
 427                 msg.msg_controllen = optlen;
 428                 msg.msg_control = (void*)(opt+1);
 429
 430                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
 431                 if (retv)
 432                         goto done;
 433 update:
 434                 retv = 0;
 435                 opt = ipv6_update_options(sk, opt);
 436 done:
 437                 if (opt)
 438                         sock_kfree_s(sk, opt, opt->tot_len);
 439                 break;
 440         }
 441         case IPV6_UNICAST_HOPS:
 442                 if (optlen < sizeof(int))
 443                         goto e_inval;
 444                 if (val > 255 || val < -1)
 445                         goto e_inval;
 446                 np->hop_limit = val;
 447                 retv = 0;
 448                 break;
 449
 450         case IPV6_MULTICAST_HOPS:
 451                 if (sk->sk_type == SOCK_STREAM)
 452                         break;
 453                 if (optlen < sizeof(int))
 454                         goto e_inval;
 455                 if (val > 255 || val < -1)
 456                         goto e_inval;
 457                 np->mcast_hops = val;
 458                 retv = 0;
 459                 break;
 460
 461         case IPV6_MULTICAST_LOOP:
 462                 if (optlen < sizeof(int))
 463                         goto e_inval;
 464                 if (val != valbool)
 465                         goto e_inval;
 466                 np->mc_loop = valbool;
 467                 retv = 0;
 468                 break;
 469
 470         case IPV6_MULTICAST_IF:
 471                 if (sk->sk_type == SOCK_STREAM)
 472                         break;
 473                 if (optlen < sizeof(int))
 474                         goto e_inval;
 475
 476                 if (val) {
 477                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 478                                 goto e_inval;
 479
 480                         if (__dev_get_by_index(net, val) == NULL) {
 481                                 retv = -ENODEV;
 482                                 break;
 483                         }
 484                 }
 485                 np->mcast_oif = val;
 486                 retv = 0;
 487                 break;
 488         case IPV6_ADD_MEMBERSHIP:
 489         case IPV6_DROP_MEMBERSHIP:
 490         {
 491                 struct ipv6_mreq mreq;
 492
 493                 if (optlen < sizeof(struct ipv6_mreq))
 494                         goto e_inval;
 495
 496                 retv = -EPROTO;
 497                 if (inet_sk(sk)->is_icsk)
 498                         break;
 499
 500                 retv = -EFAULT;
 501                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 502                         break;
 503
 504                 if (optname == IPV6_ADD_MEMBERSHIP)
 505                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 506                 else
 507                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 508                 break;
 509         }
 510         case IPV6_JOIN_ANYCAST:
 511         case IPV6_LEAVE_ANYCAST:
 512         {
 513                 struct ipv6_mreq mreq;
 514
 515                 if (optlen < sizeof(struct ipv6_mreq))
 516                         goto e_inval;
 517
 518                 retv = -EFAULT;
 519                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 520                         break;
 521
 522                 if (optname == IPV6_JOIN_ANYCAST)
 523                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 524                 else
 525                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 526                 break;
 527         }
 528         case MCAST_JOIN_GROUP:
 529         case MCAST_LEAVE_GROUP:
 530         {
 531                 struct group_req greq;
 532                 struct sockaddr_in6 *psin6;
 533
 534                 if (optlen < sizeof(struct group_req))
 535                         goto e_inval;
 536
 537                 retv = -EFAULT;
 538                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 539                         break;
 540                 if (greq.gr_group.ss_family != AF_INET6) {
 541                         retv = -EADDRNOTAVAIL;
 542                         break;
 543                 }
 544                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 545                 if (optname == MCAST_JOIN_GROUP)
 546                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 547                                 &psin6->sin6_addr);
 548                 else
 549                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 550                                 &psin6->sin6_addr);
 551                 break;
 552         }
 553         case MCAST_JOIN_SOURCE_GROUP:
 554         case MCAST_LEAVE_SOURCE_GROUP:
 555         case MCAST_BLOCK_SOURCE:
 556         case MCAST_UNBLOCK_SOURCE:
 557         {
 558                 struct group_source_req greqs;
 559                 int omode, add;
 560
 561                 if (optlen < sizeof(struct group_source_req))
 562                         goto e_inval;
 563                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 564                         retv = -EFAULT;
 565                         break;
 566                 }
 567                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 568                     greqs.gsr_source.ss_family != AF_INET6) {
 569                         retv = -EADDRNOTAVAIL;
 570                         break;
 571                 }
 572                 if (optname == MCAST_BLOCK_SOURCE) {
 573                         omode = MCAST_EXCLUDE;
 574                         add = 1;
 575                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 576                         omode = MCAST_EXCLUDE;
 577                         add = 0;
 578                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 579                         struct sockaddr_in6 *psin6;
 580
 581                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 582                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 583                                 &psin6->sin6_addr);
 584                         /* prior join w/ different source is ok */
 585                         if (retv && retv != -EADDRINUSE)
 586                                 break;
 587                         omode = MCAST_INCLUDE;
 588                         add = 1;
 589                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 590                         omode = MCAST_INCLUDE;
 591                         add = 0;
 592                 }
 593                 retv = ip6_mc_source(add, omode, sk, &greqs);
 594                 break;
 595         }
 596         case MCAST_MSFILTER:
 597         {
 598                 extern int sysctl_mld_max_msf;
 599                 struct group_filter *gsf;
 600
 601                 if (optlen < GROUP_FILTER_SIZE(0))
 602                         goto e_inval;
 603                 if (optlen > sysctl_optmem_max) {
 604                         retv = -ENOBUFS;
 605                         break;
 606                 }
 607                 gsf = kmalloc(optlen,GFP_KERNEL);
 608                 if (!gsf) {
 609                         retv = -ENOBUFS;
 610                         break;
 611                 }
 612                 retv = -EFAULT;
 613                 if (copy_from_user(gsf, optval, optlen)) {
 614                         kfree(gsf);
 615                         break;
 616                 }
 617                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 618                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 619                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 620                         kfree(gsf);
 621                         retv = -ENOBUFS;
 622                         break;
 623                 }
 624                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 625                         kfree(gsf);
 626                         retv = -EINVAL;
 627                         break;
 628                 }
 629                 retv = ip6_mc_msfilter(sk, gsf);
 630                 kfree(gsf);
 631
 632                 break;
 633         }
 634         case IPV6_ROUTER_ALERT:
 635                 if (optlen < sizeof(int))
 636                         goto e_inval;
 637                 retv = ip6_ra_control(sk, val, NULL);
 638                 break;
 639         case IPV6_MTU_DISCOVER:
 640                 if (optlen < sizeof(int))
 641                         goto e_inval;
 642                 if (val<0 || val>3)
 643                         goto e_inval;
 644                 np->pmtudisc = val;
 645                 retv = 0;
 646                 break;
 647         case IPV6_MTU:
 648                 if (optlen < sizeof(int))
 649                         goto e_inval;
 650                 if (val && val < IPV6_MIN_MTU)
 651                         goto e_inval;
 652                 np->frag_size = val;
 653                 retv = 0;
 654                 break;
 655         case IPV6_RECVERR:
 656                 if (optlen < sizeof(int))
 657                         goto e_inval;
 658                 np->recverr = valbool;
 659                 if (!val)
 660                         skb_queue_purge(&sk->sk_error_queue);
 661                 retv = 0;
 662                 break;
 663         case IPV6_FLOWINFO_SEND:
 664                 if (optlen < sizeof(int))
 665                         goto e_inval;
 666                 np->sndflow = valbool;
 667                 retv = 0;
 668                 break;
 669         case IPV6_FLOWLABEL_MGR:
 670                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 671                 break;
 672         case IPV6_IPSEC_POLICY:
 673         case IPV6_XFRM_POLICY:
 674                 retv = -EPERM;
 675                 if (!capable(CAP_NET_ADMIN))
 676                         break;
 677                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 678                 break;
 679
 680         case IPV6_ADDR_PREFERENCES:
 681             {
 682                 unsigned int pref = 0;
 683                 unsigned int prefmask = ~0;
 684
 685                 if (optlen < sizeof(int))
 686                         goto e_inval;
 687
 688                 retv = -EINVAL;
 689
 690                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 691                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 692                                IPV6_PREFER_SRC_TMP|
 693                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 694                 case IPV6_PREFER_SRC_PUBLIC:
 695                         pref |= IPV6_PREFER_SRC_PUBLIC;
 696                         break;
 697                 case IPV6_PREFER_SRC_TMP:
 698                         pref |= IPV6_PREFER_SRC_TMP;
 699                         break;
 700                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 701                         break;
 702                 case 0:
 703                         goto pref_skip_pubtmp;
 704                 default:
 705                         goto e_inval;
 706                 }
 707
 708                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 709                               IPV6_PREFER_SRC_TMP);
 710 pref_skip_pubtmp:
 711
 712                 /* check HOME/COA conflicts */
 713                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 714                 case IPV6_PREFER_SRC_HOME:
 715                         break;
 716                 case IPV6_PREFER_SRC_COA:
 717                         pref |= IPV6_PREFER_SRC_COA;
 718                 case 0:
 719                         goto pref_skip_coa;
 720                 default:
 721                         goto e_inval;
 722                 }
 723
 724                 prefmask &= ~IPV6_PREFER_SRC_COA;
 725 pref_skip_coa:
 726
 727                 /* check CGA/NONCGA conflicts */
 728                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 729                 case IPV6_PREFER_SRC_CGA:
 730                 case IPV6_PREFER_SRC_NONCGA:
 731                 case 0:
 732                         break;
 733                 default:
 734                         goto e_inval;
 735                 }
 736
 737                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 738                 retv = 0;
 739
 740                 break;
 741             }
 742         }
 743
 744         release_sock(sk);
 745
 746         return retv;
 747
 748 e_inval:
 749         release_sock(sk);
 750         return -EINVAL;
 751 }
 752
 753 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 754                     char __user *optval, int optlen)
 755 {
 756         int err;
 757
 758         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 759                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 760
 761         if (level != SOL_IPV6)
 762                 return -ENOPROTOOPT;
 763
 764         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 765 #ifdef CONFIG_NETFILTER
 766         /* we need to exclude all possible ENOPROTOOPTs except default case */
 767         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 768                         optname != IPV6_XFRM_POLICY) {
 769                 lock_sock(sk);
 770                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 771                                 optlen);
 772                 release_sock(sk);
 773         }
 774 #endif
 775         return err;
 776 }
 777
 778 EXPORT_SYMBOL(ipv6_setsockopt);
 779
 780 #ifdef CONFIG_COMPAT
 781 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 782                            char __user *optval, int optlen)
 783 {
 784         int err;
 785
 786         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 787                 if (udp_prot.compat_setsockopt != NULL)
 788                         return udp_prot.compat_setsockopt(sk, level, optname,
 789                                                           optval, optlen);
 790                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 791         }
 792
 793         if (level != SOL_IPV6)
 794                 return -ENOPROTOOPT;
 795
 796         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 797                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 798                         ipv6_setsockopt);
 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 = compat_nf_setsockopt(sk, PF_INET6, optname,
 807                                            optval, optlen);
 808                 release_sock(sk);
 809         }
 810 #endif
 811         return err;
 812 }
 813
 814 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 815 #endif
 816
 817 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 818                                   int optname, char __user *optval, int len)
 819 {
 820         struct ipv6_opt_hdr *hdr;
 821
 822         if (!opt)
 823                 return 0;
 824
 825         switch(optname) {
 826         case IPV6_HOPOPTS:
 827                 hdr = opt->hopopt;
 828                 break;
 829         case IPV6_RTHDRDSTOPTS:
 830                 hdr = opt->dst0opt;
 831                 break;
 832         case IPV6_RTHDR:
 833                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 834                 break;
 835         case IPV6_DSTOPTS:
 836                 hdr = opt->dst1opt;
 837                 break;
 838         default:
 839                 return -EINVAL; /* should not happen */
 840         }
 841
 842         if (!hdr)
 843                 return 0;
 844
 845         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 846         if (copy_to_user(optval, hdr, len))
 847                 return -EFAULT;
 848         return len;
 849 }
 850
 851 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 852                     char __user *optval, int __user *optlen)
 853 {
 854         struct ipv6_pinfo *np = inet6_sk(sk);
 855         int len;
 856         int val;
 857
 858         if (ip6_mroute_opt(optname))
 859                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 860
 861         if (get_user(len, optlen))
 862                 return -EFAULT;
 863         switch (optname) {
 864         case IPV6_ADDRFORM:
 865                 if (sk->sk_protocol != IPPROTO_UDP &&
 866                     sk->sk_protocol != IPPROTO_UDPLITE &&
 867                     sk->sk_protocol != IPPROTO_TCP)
 868                         return -ENOPROTOOPT;
 869                 if (sk->sk_state != TCP_ESTABLISHED)
 870                         return -ENOTCONN;
 871                 val = sk->sk_family;
 872                 break;
 873         case MCAST_MSFILTER:
 874         {
 875                 struct group_filter gsf;
 876                 int err;
 877
 878                 if (len < GROUP_FILTER_SIZE(0))
 879                         return -EINVAL;
 880                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 881                         return -EFAULT;
 882                 if (gsf.gf_group.ss_family != AF_INET6)
 883                         return -EADDRNOTAVAIL;
 884                 lock_sock(sk);
 885                 err = ip6_mc_msfget(sk, &gsf,
 886                         (struct group_filter __user *)optval, optlen);
 887                 release_sock(sk);
 888                 return err;
 889         }
 890
 891         case IPV6_2292PKTOPTIONS:
 892         {
 893                 struct msghdr msg;
 894                 struct sk_buff *skb;
 895
 896                 if (sk->sk_type != SOCK_STREAM)
 897                         return -ENOPROTOOPT;
 898
 899                 msg.msg_control = optval;
 900                 msg.msg_controllen = len;
 901                 msg.msg_flags = 0;
 902
 903                 lock_sock(sk);
 904                 skb = np->pktoptions;
 905                 if (skb)
 906                         atomic_inc(&skb->users);
 907                 release_sock(sk);
 908
 909                 if (skb) {
 910                         int err = datagram_recv_ctl(sk, &msg, skb);
 911                         kfree_skb(skb);
 912                         if (err)
 913                                 return err;
 914                 } else {
 915                         if (np->rxopt.bits.rxinfo) {
 916                                 struct in6_pktinfo src_info;
 917                                 src_info.ipi6_ifindex = np->mcast_oif;
 918                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 919                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 920                         }
 921                         if (np->rxopt.bits.rxhlim) {
 922                                 int hlim = np->mcast_hops;
 923                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 924                         }
 925                         if (np->rxopt.bits.rxoinfo) {
 926                                 struct in6_pktinfo src_info;
 927                                 src_info.ipi6_ifindex = np->mcast_oif;
 928                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 929                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 930                         }
 931                         if (np->rxopt.bits.rxohlim) {
 932                                 int hlim = np->mcast_hops;
 933                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 934                         }
 935                 }
 936                 len -= msg.msg_controllen;
 937                 return put_user(len, optlen);
 938         }
 939         case IPV6_MTU:
 940         {
 941                 struct dst_entry *dst;
 942                 val = 0;
 943                 lock_sock(sk);
 944                 dst = sk_dst_get(sk);
 945                 if (dst) {
 946                         val = dst_mtu(dst);
 947                         dst_release(dst);
 948                 }
 949                 release_sock(sk);
 950                 if (!val)
 951                         return -ENOTCONN;
 952                 break;
 953         }
 954
 955         case IPV6_V6ONLY:
 956                 val = np->ipv6only;
 957                 break;
 958
 959         case IPV6_RECVPKTINFO:
 960                 val = np->rxopt.bits.rxinfo;
 961                 break;
 962
 963         case IPV6_2292PKTINFO:
 964                 val = np->rxopt.bits.rxoinfo;
 965                 break;
 966
 967         case IPV6_RECVHOPLIMIT:
 968                 val = np->rxopt.bits.rxhlim;
 969                 break;
 970
 971         case IPV6_2292HOPLIMIT:
 972                 val = np->rxopt.bits.rxohlim;
 973                 break;
 974
 975         case IPV6_RECVRTHDR:
 976                 val = np->rxopt.bits.srcrt;
 977                 break;
 978
 979         case IPV6_2292RTHDR:
 980                 val = np->rxopt.bits.osrcrt;
 981                 break;
 982
 983         case IPV6_HOPOPTS:
 984         case IPV6_RTHDRDSTOPTS:
 985         case IPV6_RTHDR:
 986         case IPV6_DSTOPTS:
 987         {
 988
 989                 lock_sock(sk);
 990                 len = ipv6_getsockopt_sticky(sk, np->opt,
 991                                              optname, optval, len);
 992                 release_sock(sk);
 993                 /* check if ipv6_getsockopt_sticky() returns err code */
 994                 if (len < 0)
 995                         return len;
 996                 return put_user(len, optlen);
 997         }
 998
 999         case IPV6_RECVHOPOPTS:
1000                 val = np->rxopt.bits.hopopts;
1001                 break;
1002
1003         case IPV6_2292HOPOPTS:
1004                 val = np->rxopt.bits.ohopopts;
1005                 break;
1006
1007         case IPV6_RECVDSTOPTS:
1008                 val = np->rxopt.bits.dstopts;
1009                 break;
1010
1011         case IPV6_2292DSTOPTS:
1012                 val = np->rxopt.bits.odstopts;
1013                 break;
1014
1015         case IPV6_TCLASS:
1016                 val = np->tclass;
1017                 if (val < 0)
1018                         val = 0;
1019                 break;
1020
1021         case IPV6_RECVTCLASS:
1022                 val = np->rxopt.bits.rxtclass;
1023                 break;
1024
1025         case IPV6_FLOWINFO:
1026                 val = np->rxopt.bits.rxflow;
1027                 break;
1028
1029         case IPV6_UNICAST_HOPS:
1030         case IPV6_MULTICAST_HOPS:
1031         {
1032                 struct dst_entry *dst;
1033
1034                 if (optname == IPV6_UNICAST_HOPS)
1035                         val = np->hop_limit;
1036                 else
1037                         val = np->mcast_hops;
1038
1039                 dst = sk_dst_get(sk);
1040                 if (dst) {
1041                         if (val < 0)
1042                                 val = ip6_dst_hoplimit(dst);
1043                         dst_release(dst);
1044                 }
1045                 if (val < 0)
1046                         val = ipv6_devconf.hop_limit;
1047                 break;
1048         }
1049
1050         case IPV6_MULTICAST_LOOP:
1051                 val = np->mc_loop;
1052                 break;
1053
1054         case IPV6_MULTICAST_IF:
1055                 val = np->mcast_oif;
1056                 break;
1057
1058         case IPV6_MTU_DISCOVER:
1059                 val = np->pmtudisc;
1060                 break;
1061
1062         case IPV6_RECVERR:
1063                 val = np->recverr;
1064                 break;
1065
1066         case IPV6_FLOWINFO_SEND:
1067                 val = np->sndflow;
1068                 break;
1069
1070         case IPV6_ADDR_PREFERENCES:
1071                 val = 0;
1072
1073                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1074                         val |= IPV6_PREFER_SRC_TMP;
1075                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1076                         val |= IPV6_PREFER_SRC_PUBLIC;
1077                 else {
1078                         /* XXX: should we return system default? */
1079                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1080                 }
1081
1082                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1083                         val |= IPV6_PREFER_SRC_COA;
1084                 else
1085                         val |= IPV6_PREFER_SRC_HOME;
1086                 break;
1087
1088         default:
1089                 return -ENOPROTOOPT;
1090         }
1091         len = min_t(unsigned int, sizeof(int), len);
1092         if(put_user(len, optlen))
1093                 return -EFAULT;
1094         if(copy_to_user(optval,&val,len))
1095                 return -EFAULT;
1096         return 0;
1097 }
1098
1099 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1100                     char __user *optval, int __user *optlen)
1101 {
1102         int err;
1103
1104         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1105                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1106
1107         if(level != SOL_IPV6)
1108                 return -ENOPROTOOPT;
1109
1110         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1111 #ifdef CONFIG_NETFILTER
1112         /* we need to exclude all possible ENOPROTOOPTs except default case */
1113         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1114                 int len;
1115
1116                 if (get_user(len, optlen))
1117                         return -EFAULT;
1118
1119                 lock_sock(sk);
1120                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1121                                 &len);
1122                 release_sock(sk);
1123                 if (err >= 0)
1124                         err = put_user(len, optlen);
1125         }
1126 #endif
1127         return err;
1128 }
1129
1130 EXPORT_SYMBOL(ipv6_getsockopt);
1131
1132 #ifdef CONFIG_COMPAT
1133 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1134                            char __user *optval, int __user *optlen)
1135 {
1136         int err;
1137
1138         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1139                 if (udp_prot.compat_getsockopt != NULL)
1140                         return udp_prot.compat_getsockopt(sk, level, optname,
1141                                                           optval, optlen);
1142                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1143         }
1144
1145         if (level != SOL_IPV6)
1146                 return -ENOPROTOOPT;
1147
1148         if (optname == MCAST_MSFILTER)
1149                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1150                         ipv6_getsockopt);
1151
1152         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1153 #ifdef CONFIG_NETFILTER
1154         /* we need to exclude all possible ENOPROTOOPTs except default case */
1155         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1156                 int len;
1157
1158                 if (get_user(len, optlen))
1159                         return -EFAULT;
1160
1161                 lock_sock(sk);
1162                 err = compat_nf_getsockopt(sk, PF_INET6,
1163                                            optname, optval, &len);
1164                 release_sock(sk);
1165                 if (err >= 0)
1166                         err = put_user(len, optlen);
1167         }
1168 #endif
1169         return err;
1170 }
1171
1172 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1173 #endif
1174