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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/config.h>
  31 #include <linux/errno.h>
  32 #include <linux/types.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/sched.h>
  36 #include <linux/net.h>
  37 #include <linux/in6.h>
  38 #include <linux/netdevice.h>
  39 #include <linux/if_arp.h>
  40 #include <linux/init.h>
  41 #include <linux/sysctl.h>
  42 #include <linux/netfilter.h>
  43
  44 #include <net/sock.h>
  45 #include <net/snmp.h>
  46 #include <net/ipv6.h>
  47 #include <net/ndisc.h>
  48 #include <net/protocol.h>
  49 #include <net/transp_v6.h>
  50 #include <net/ip6_route.h>
  51 #include <net/addrconf.h>
  52 #include <net/inet_common.h>
  53 #include <net/tcp.h>
  54 #include <net/udp.h>
  55 #include <net/xfrm.h>
  56
  57 #include <asm/uaccess.h>
  58
  59 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  60
  61 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
  62 {
  63         struct sk_buff *segs = ERR_PTR(-EINVAL);
  64         struct ipv6hdr *ipv6h;
  65         struct inet6_protocol *ops;
  66         int proto;
  67
  68         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
  69                 goto out;
  70
  71         ipv6h = skb->nh.ipv6h;
  72         proto = ipv6h->nexthdr;
  73         __skb_pull(skb, sizeof(*ipv6h));
  74
  75         rcu_read_lock();
  76         for (;;) {
  77                 struct ipv6_opt_hdr *opth;
  78                 int len;
  79
  80                 if (proto != NEXTHDR_HOP) {
  81                         ops = rcu_dereference(inet6_protos[proto]);
  82
  83                         if (unlikely(!ops))
  84                                 goto unlock;
  85
  86                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
  87                                 break;
  88                 }
  89
  90                 if (unlikely(!pskb_may_pull(skb, 8)))
  91                         goto unlock;
  92
  93                 opth = (void *)skb->data;
  94                 len = opth->hdrlen * 8 + 8;
  95
  96                 if (unlikely(!pskb_may_pull(skb, len)))
  97                         goto unlock;
  98
  99                 proto = opth->nexthdr;
 100                 __skb_pull(skb, len);
 101         }
 102
 103         skb->h.raw = skb->data;
 104         if (likely(ops->gso_segment))
 105                 segs = ops->gso_segment(skb, features);
 106
 107 unlock:
 108         rcu_read_unlock();
 109
 110         if (unlikely(IS_ERR(segs)))
 111                 goto out;
 112
 113         for (skb = segs; skb; skb = skb->next) {
 114                 ipv6h = skb->nh.ipv6h;
 115                 ipv6h->payload_len = htons(skb->len - skb->mac_len);
 116         }
 117
 118 out:
 119         return segs;
 120 }
 121
 122 static struct packet_type ipv6_packet_type = {
 123         .type = __constant_htons(ETH_P_IPV6),
 124         .func = ipv6_rcv,
 125         .gso_segment = ipv6_gso_segment,
 126 };
 127
 128 struct ip6_ra_chain *ip6_ra_chain;
 129 DEFINE_RWLOCK(ip6_ra_lock);
 130
 131 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
 132 {
 133         struct ip6_ra_chain *ra, *new_ra, **rap;
 134
 135         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
 136         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
 137                 return -EINVAL;
 138
 139         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
 140
 141         write_lock_bh(&ip6_ra_lock);
 142         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
 143                 if (ra->sk == sk) {
 144                         if (sel>=0) {
 145                                 write_unlock_bh(&ip6_ra_lock);
 146                                 kfree(new_ra);
 147                                 return -EADDRINUSE;
 148                         }
 149
 150                         *rap = ra->next;
 151                         write_unlock_bh(&ip6_ra_lock);
 152
 153                         if (ra->destructor)
 154                                 ra->destructor(sk);
 155                         sock_put(sk);
 156                         kfree(ra);
 157                         return 0;
 158                 }
 159         }
 160         if (new_ra == NULL) {
 161                 write_unlock_bh(&ip6_ra_lock);
 162                 return -ENOBUFS;
 163         }
 164         new_ra->sk = sk;
 165         new_ra->sel = sel;
 166         new_ra->destructor = destructor;
 167         new_ra->next = ra;
 168         *rap = new_ra;
 169         sock_hold(sk);
 170         write_unlock_bh(&ip6_ra_lock);
 171         return 0;
 172 }
 173
 174 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 175                     char __user *optval, int optlen)
 176 {
 177         struct ipv6_pinfo *np = inet6_sk(sk);
 178         int val, valbool;
 179         int retv = -ENOPROTOOPT;
 180
 181         if (optval == NULL)
 182                 val=0;
 183         else if (get_user(val, (int __user *) optval))
 184                 return -EFAULT;
 185
 186         valbool = (val!=0);
 187
 188         lock_sock(sk);
 189
 190         switch (optname) {
 191
 192         case IPV6_ADDRFORM:
 193                 if (val == PF_INET) {
 194                         struct ipv6_txoptions *opt;
 195                         struct sk_buff *pktopt;
 196
 197                         if (sk->sk_protocol != IPPROTO_UDP &&
 198                             sk->sk_protocol != IPPROTO_TCP)
 199                                 break;
 200
 201                         if (sk->sk_state != TCP_ESTABLISHED) {
 202                                 retv = -ENOTCONN;
 203                                 break;
 204                         }
 205
 206                         if (ipv6_only_sock(sk) ||
 207                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 208                                 retv = -EADDRNOTAVAIL;
 209                                 break;
 210                         }
 211
 212                         fl6_free_socklist(sk);
 213                         ipv6_sock_mc_close(sk);
 214
 215                         /*
 216                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 217                          * remove it from the refcnt debug socks count in the
 218                          * original family...
 219                          */
 220                         sk_refcnt_debug_dec(sk);
 221
 222                         if (sk->sk_protocol == IPPROTO_TCP) {
 223                                 struct inet_connection_sock *icsk = inet_csk(sk);
 224
 225                                 local_bh_disable();
 226                                 sock_prot_dec_use(sk->sk_prot);
 227                                 sock_prot_inc_use(&tcp_prot);
 228                                 local_bh_enable();
 229                                 sk->sk_prot = &tcp_prot;
 230                                 icsk->icsk_af_ops = &ipv4_specific;
 231                                 sk->sk_socket->ops = &inet_stream_ops;
 232                                 sk->sk_family = PF_INET;
 233                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 234                         } else {
 235                                 local_bh_disable();
 236                                 sock_prot_dec_use(sk->sk_prot);
 237                                 sock_prot_inc_use(&udp_prot);
 238                                 local_bh_enable();
 239                                 sk->sk_prot = &udp_prot;
 240                                 sk->sk_socket->ops = &inet_dgram_ops;
 241                                 sk->sk_family = PF_INET;
 242                         }
 243                         opt = xchg(&np->opt, NULL);
 244                         if (opt)
 245                                 sock_kfree_s(sk, opt, opt->tot_len);
 246                         pktopt = xchg(&np->pktoptions, NULL);
 247                         if (pktopt)
 248                                 kfree_skb(pktopt);
 249
 250                         sk->sk_destruct = inet_sock_destruct;
 251                         /*
 252                          * ... and add it to the refcnt debug socks count
 253                          * in the new family. -acme
 254                          */
 255                         sk_refcnt_debug_inc(sk);
 256                         module_put(THIS_MODULE);
 257                         retv = 0;
 258                         break;
 259                 }
 260                 goto e_inval;
 261
 262         case IPV6_V6ONLY:
 263                 if (inet_sk(sk)->num)
 264                         goto e_inval;
 265                 np->ipv6only = valbool;
 266                 retv = 0;
 267                 break;
 268
 269         case IPV6_RECVPKTINFO:
 270                 np->rxopt.bits.rxinfo = valbool;
 271                 retv = 0;
 272                 break;
 273
 274         case IPV6_2292PKTINFO:
 275                 np->rxopt.bits.rxoinfo = valbool;
 276                 retv = 0;
 277                 break;
 278
 279         case IPV6_RECVHOPLIMIT:
 280                 np->rxopt.bits.rxhlim = valbool;
 281                 retv = 0;
 282                 break;
 283
 284         case IPV6_2292HOPLIMIT:
 285                 np->rxopt.bits.rxohlim = valbool;
 286                 retv = 0;
 287                 break;
 288
 289         case IPV6_RECVRTHDR:
 290                 if (val < 0 || val > 2)
 291                         goto e_inval;
 292                 np->rxopt.bits.srcrt = val;
 293                 retv = 0;
 294                 break;
 295
 296         case IPV6_2292RTHDR:
 297                 if (val < 0 || val > 2)
 298                         goto e_inval;
 299                 np->rxopt.bits.osrcrt = val;
 300                 retv = 0;
 301                 break;
 302
 303         case IPV6_RECVHOPOPTS:
 304                 np->rxopt.bits.hopopts = valbool;
 305                 retv = 0;
 306                 break;
 307
 308         case IPV6_2292HOPOPTS:
 309                 np->rxopt.bits.ohopopts = valbool;
 310                 retv = 0;
 311                 break;
 312
 313         case IPV6_RECVDSTOPTS:
 314                 np->rxopt.bits.dstopts = valbool;
 315                 retv = 0;
 316                 break;
 317
 318         case IPV6_2292DSTOPTS:
 319                 np->rxopt.bits.odstopts = valbool;
 320                 retv = 0;
 321                 break;
 322
 323         case IPV6_TCLASS:
 324                 if (val < 0 || val > 0xff)
 325                         goto e_inval;
 326                 np->tclass = val;
 327                 retv = 0;
 328                 break;
 329
 330         case IPV6_RECVTCLASS:
 331                 np->rxopt.bits.rxtclass = valbool;
 332                 retv = 0;
 333                 break;
 334
 335         case IPV6_FLOWINFO:
 336                 np->rxopt.bits.rxflow = valbool;
 337                 retv = 0;
 338                 break;
 339
 340         case IPV6_HOPOPTS:
 341         case IPV6_RTHDRDSTOPTS:
 342         case IPV6_RTHDR:
 343         case IPV6_DSTOPTS:
 344         {
 345                 struct ipv6_txoptions *opt;
 346                 if (optlen == 0)
 347                         optval = NULL;
 348
 349                 /* hop-by-hop / destination options are privileged option */
 350                 retv = -EPERM;
 351                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 352                         break;
 353
 354                 retv = -EINVAL;
 355                 if (optlen & 0x7 || optlen > 8 * 255)
 356                         break;
 357
 358                 opt = ipv6_renew_options(sk, np->opt, optname,
 359                                          (struct ipv6_opt_hdr __user *)optval,
 360                                          optlen);
 361                 if (IS_ERR(opt)) {
 362                         retv = PTR_ERR(opt);
 363                         break;
 364                 }
 365
 366                 /* routing header option needs extra check */
 367                 if (optname == IPV6_RTHDR && opt->srcrt) {
 368                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 369                         if (rthdr->type)
 370                                 goto sticky_done;
 371                         if ((rthdr->hdrlen & 1) ||
 372                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 373                                 goto sticky_done;
 374                 }
 375
 376                 retv = 0;
 377                 if (inet_sk(sk)->is_icsk) {
 378                         if (opt) {
 379                                 struct inet_connection_sock *icsk = inet_csk(sk);
 380                                 if (!((1 << sk->sk_state) &
 381                                       (TCPF_LISTEN | TCPF_CLOSE))
 382                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 383                                         icsk->icsk_ext_hdr_len =
 384                                                 opt->opt_flen + opt->opt_nflen;
 385                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 386                                 }
 387                         }
 388                         opt = xchg(&np->opt, opt);
 389                         sk_dst_reset(sk);
 390                 } else {
 391                         write_lock(&sk->sk_dst_lock);
 392                         opt = xchg(&np->opt, opt);
 393                         write_unlock(&sk->sk_dst_lock);
 394                         sk_dst_reset(sk);
 395                 }
 396 sticky_done:
 397                 if (opt)
 398                         sock_kfree_s(sk, opt, opt->tot_len);
 399                 break;
 400         }
 401
 402         case IPV6_2292PKTOPTIONS:
 403         {
 404                 struct ipv6_txoptions *opt = NULL;
 405                 struct msghdr msg;
 406                 struct flowi fl;
 407                 int junk;
 408
 409                 fl.fl6_flowlabel = 0;
 410                 fl.oif = sk->sk_bound_dev_if;
 411
 412                 if (optlen == 0)
 413                         goto update;
 414
 415                 /* 1K is probably excessive
 416                  * 1K is surely not enough, 2K per standard header is 16K.
 417                  */
 418                 retv = -EINVAL;
 419                 if (optlen > 64*1024)
 420                         break;
 421
 422                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 423                 retv = -ENOBUFS;
 424                 if (opt == NULL)
 425                         break;
 426
 427                 memset(opt, 0, sizeof(*opt));
 428                 opt->tot_len = sizeof(*opt) + optlen;
 429                 retv = -EFAULT;
 430                 if (copy_from_user(opt+1, optval, optlen))
 431                         goto done;
 432
 433                 msg.msg_controllen = optlen;
 434                 msg.msg_control = (void*)(opt+1);
 435
 436                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 437                 if (retv)
 438                         goto done;
 439 update:
 440                 retv = 0;
 441                 if (inet_sk(sk)->is_icsk) {
 442                         if (opt) {
 443                                 struct inet_connection_sock *icsk = inet_csk(sk);
 444                                 if (!((1 << sk->sk_state) &
 445                                       (TCPF_LISTEN | TCPF_CLOSE))
 446                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 447                                         icsk->icsk_ext_hdr_len =
 448                                                 opt->opt_flen + opt->opt_nflen;
 449                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 450                                 }
 451                         }
 452                         opt = xchg(&np->opt, opt);
 453                         sk_dst_reset(sk);
 454                 } else {
 455                         write_lock(&sk->sk_dst_lock);
 456                         opt = xchg(&np->opt, opt);
 457                         write_unlock(&sk->sk_dst_lock);
 458                         sk_dst_reset(sk);
 459                 }
 460
 461 done:
 462                 if (opt)
 463                         sock_kfree_s(sk, opt, opt->tot_len);
 464                 break;
 465         }
 466         case IPV6_UNICAST_HOPS:
 467                 if (val > 255 || val < -1)
 468                         goto e_inval;
 469                 np->hop_limit = val;
 470                 retv = 0;
 471                 break;
 472
 473         case IPV6_MULTICAST_HOPS:
 474                 if (sk->sk_type == SOCK_STREAM)
 475                         goto e_inval;
 476                 if (val > 255 || val < -1)
 477                         goto e_inval;
 478                 np->mcast_hops = val;
 479                 retv = 0;
 480                 break;
 481
 482         case IPV6_MULTICAST_LOOP:
 483                 np->mc_loop = valbool;
 484                 retv = 0;
 485                 break;
 486
 487         case IPV6_MULTICAST_IF:
 488                 if (sk->sk_type == SOCK_STREAM)
 489                         goto e_inval;
 490                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 491                         goto e_inval;
 492
 493                 if (__dev_get_by_index(val) == NULL) {
 494                         retv = -ENODEV;
 495                         break;
 496                 }
 497                 np->mcast_oif = val;
 498                 retv = 0;
 499                 break;
 500         case IPV6_ADD_MEMBERSHIP:
 501         case IPV6_DROP_MEMBERSHIP:
 502         {
 503                 struct ipv6_mreq mreq;
 504
 505                 retv = -EFAULT;
 506                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 507                         break;
 508
 509                 if (optname == IPV6_ADD_MEMBERSHIP)
 510                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 511                 else
 512                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 513                 break;
 514         }
 515         case IPV6_JOIN_ANYCAST:
 516         case IPV6_LEAVE_ANYCAST:
 517         {
 518                 struct ipv6_mreq mreq;
 519
 520                 if (optlen != sizeof(struct ipv6_mreq))
 521                         goto e_inval;
 522
 523                 retv = -EFAULT;
 524                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 525                         break;
 526
 527                 if (optname == IPV6_JOIN_ANYCAST)
 528                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 529                 else
 530                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 531                 break;
 532         }
 533         case MCAST_JOIN_GROUP:
 534         case MCAST_LEAVE_GROUP:
 535         {
 536                 struct group_req greq;
 537                 struct sockaddr_in6 *psin6;
 538
 539                 retv = -EFAULT;
 540                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 541                         break;
 542                 if (greq.gr_group.ss_family != AF_INET6) {
 543                         retv = -EADDRNOTAVAIL;
 544                         break;
 545                 }
 546                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 547                 if (optname == MCAST_JOIN_GROUP)
 548                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 549                                 &psin6->sin6_addr);
 550                 else
 551                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 552                                 &psin6->sin6_addr);
 553                 break;
 554         }
 555         case MCAST_JOIN_SOURCE_GROUP:
 556         case MCAST_LEAVE_SOURCE_GROUP:
 557         case MCAST_BLOCK_SOURCE:
 558         case MCAST_UNBLOCK_SOURCE:
 559         {
 560                 struct group_source_req greqs;
 561                 int omode, add;
 562
 563                 if (optlen != sizeof(struct group_source_req))
 564                         goto e_inval;
 565                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 566                         retv = -EFAULT;
 567                         break;
 568                 }
 569                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 570                     greqs.gsr_source.ss_family != AF_INET6) {
 571                         retv = -EADDRNOTAVAIL;
 572                         break;
 573                 }
 574                 if (optname == MCAST_BLOCK_SOURCE) {
 575                         omode = MCAST_EXCLUDE;
 576                         add = 1;
 577                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 578                         omode = MCAST_EXCLUDE;
 579                         add = 0;
 580                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 581                         struct sockaddr_in6 *psin6;
 582
 583                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 584                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 585                                 &psin6->sin6_addr);
 586                         /* prior join w/ different source is ok */
 587                         if (retv && retv != -EADDRINUSE)
 588                                 break;
 589                         omode = MCAST_INCLUDE;
 590                         add = 1;
 591                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 592                         omode = MCAST_INCLUDE;
 593                         add = 0;
 594                 }
 595                 retv = ip6_mc_source(add, omode, sk, &greqs);
 596                 break;
 597         }
 598         case MCAST_MSFILTER:
 599         {
 600                 extern int sysctl_mld_max_msf;
 601                 struct group_filter *gsf;
 602
 603                 if (optlen < GROUP_FILTER_SIZE(0))
 604                         goto e_inval;
 605                 if (optlen > sysctl_optmem_max) {
 606                         retv = -ENOBUFS;
 607                         break;
 608                 }
 609                 gsf = kmalloc(optlen,GFP_KERNEL);
 610                 if (gsf == 0) {
 611                         retv = -ENOBUFS;
 612                         break;
 613                 }
 614                 retv = -EFAULT;
 615                 if (copy_from_user(gsf, optval, optlen)) {
 616                         kfree(gsf);
 617                         break;
 618                 }
 619                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 620                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 621                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 622                         kfree(gsf);
 623                         retv = -ENOBUFS;
 624                         break;
 625                 }
 626                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 627                         kfree(gsf);
 628                         retv = -EINVAL;
 629                         break;
 630                 }
 631                 retv = ip6_mc_msfilter(sk, gsf);
 632                 kfree(gsf);
 633
 634                 break;
 635         }
 636         case IPV6_ROUTER_ALERT:
 637                 retv = ip6_ra_control(sk, val, NULL);
 638                 break;
 639         case IPV6_MTU_DISCOVER:
 640                 if (val<0 || val>2)
 641                         goto e_inval;
 642                 np->pmtudisc = val;
 643                 retv = 0;
 644                 break;
 645         case IPV6_MTU:
 646                 if (val && val < IPV6_MIN_MTU)
 647                         goto e_inval;
 648                 np->frag_size = val;
 649                 retv = 0;
 650                 break;
 651         case IPV6_RECVERR:
 652                 np->recverr = valbool;
 653                 if (!val)
 654                         skb_queue_purge(&sk->sk_error_queue);
 655                 retv = 0;
 656                 break;
 657         case IPV6_FLOWINFO_SEND:
 658                 np->sndflow = valbool;
 659                 retv = 0;
 660                 break;
 661         case IPV6_FLOWLABEL_MGR:
 662                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 663                 break;
 664         case IPV6_IPSEC_POLICY:
 665         case IPV6_XFRM_POLICY:
 666                 retv = -EPERM;
 667                 if (!capable(CAP_NET_ADMIN))
 668                         break;
 669                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 670                 break;
 671
 672         }
 673         release_sock(sk);
 674
 675         return retv;
 676
 677 e_inval:
 678         release_sock(sk);
 679         return -EINVAL;
 680 }
 681
 682 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 683                     char __user *optval, int optlen)
 684 {
 685         int err;
 686
 687         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 688                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 689
 690         if (level != SOL_IPV6)
 691                 return -ENOPROTOOPT;
 692
 693         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 694 #ifdef CONFIG_NETFILTER
 695         /* we need to exclude all possible ENOPROTOOPTs except default case */
 696         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 697                         optname != IPV6_XFRM_POLICY) {
 698                 lock_sock(sk);
 699                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 700                                 optlen);
 701                 release_sock(sk);
 702         }
 703 #endif
 704         return err;
 705 }
 706
 707
 708 #ifdef CONFIG_COMPAT
 709 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 710                            char __user *optval, int optlen)
 711 {
 712         int err;
 713
 714         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 715                 if (udp_prot.compat_setsockopt != NULL)
 716                         return udp_prot.compat_setsockopt(sk, level, optname,
 717                                                           optval, optlen);
 718                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 719         }
 720
 721         if (level != SOL_IPV6)
 722                 return -ENOPROTOOPT;
 723
 724         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 725 #ifdef CONFIG_NETFILTER
 726         /* we need to exclude all possible ENOPROTOOPTs except default case */
 727         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 728             optname != IPV6_XFRM_POLICY) {
 729                 lock_sock(sk);
 730                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 731                                            optval, optlen);
 732                 release_sock(sk);
 733         }
 734 #endif
 735         return err;
 736 }
 737
 738 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 739 #endif
 740
 741 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
 742                                   char __user *optval, int len)
 743 {
 744         if (!hdr)
 745                 return 0;
 746         len = min_t(int, len, ipv6_optlen(hdr));
 747         if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
 748                 return -EFAULT;
 749         return len;
 750 }
 751
 752 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 753                     char __user *optval, int __user *optlen)
 754 {
 755         struct ipv6_pinfo *np = inet6_sk(sk);
 756         int len;
 757         int val;
 758
 759         if (get_user(len, optlen))
 760                 return -EFAULT;
 761         switch (optname) {
 762         case IPV6_ADDRFORM:
 763                 if (sk->sk_protocol != IPPROTO_UDP &&
 764                     sk->sk_protocol != IPPROTO_TCP)
 765                         return -EINVAL;
 766                 if (sk->sk_state != TCP_ESTABLISHED)
 767                         return -ENOTCONN;
 768                 val = sk->sk_family;
 769                 break;
 770         case MCAST_MSFILTER:
 771         {
 772                 struct group_filter gsf;
 773                 int err;
 774
 775                 if (len < GROUP_FILTER_SIZE(0))
 776                         return -EINVAL;
 777                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 778                         return -EFAULT;
 779                 lock_sock(sk);
 780                 err = ip6_mc_msfget(sk, &gsf,
 781                         (struct group_filter __user *)optval, optlen);
 782                 release_sock(sk);
 783                 return err;
 784         }
 785
 786         case IPV6_2292PKTOPTIONS:
 787         {
 788                 struct msghdr msg;
 789                 struct sk_buff *skb;
 790
 791                 if (sk->sk_type != SOCK_STREAM)
 792                         return -ENOPROTOOPT;
 793
 794                 msg.msg_control = optval;
 795                 msg.msg_controllen = len;
 796                 msg.msg_flags = 0;
 797
 798                 lock_sock(sk);
 799                 skb = np->pktoptions;
 800                 if (skb)
 801                         atomic_inc(&skb->users);
 802                 release_sock(sk);
 803
 804                 if (skb) {
 805                         int err = datagram_recv_ctl(sk, &msg, skb);
 806                         kfree_skb(skb);
 807                         if (err)
 808                                 return err;
 809                 } else {
 810                         if (np->rxopt.bits.rxinfo) {
 811                                 struct in6_pktinfo src_info;
 812                                 src_info.ipi6_ifindex = np->mcast_oif;
 813                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 814                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 815                         }
 816                         if (np->rxopt.bits.rxhlim) {
 817                                 int hlim = np->mcast_hops;
 818                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 819                         }
 820                         if (np->rxopt.bits.rxoinfo) {
 821                                 struct in6_pktinfo src_info;
 822                                 src_info.ipi6_ifindex = np->mcast_oif;
 823                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 824                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 825                         }
 826                         if (np->rxopt.bits.rxohlim) {
 827                                 int hlim = np->mcast_hops;
 828                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 829                         }
 830                 }
 831                 len -= msg.msg_controllen;
 832                 return put_user(len, optlen);
 833         }
 834         case IPV6_MTU:
 835         {
 836                 struct dst_entry *dst;
 837                 val = 0;
 838                 lock_sock(sk);
 839                 dst = sk_dst_get(sk);
 840                 if (dst) {
 841                         val = dst_mtu(dst);
 842                         dst_release(dst);
 843                 }
 844                 release_sock(sk);
 845                 if (!val)
 846                         return -ENOTCONN;
 847                 break;
 848         }
 849
 850         case IPV6_V6ONLY:
 851                 val = np->ipv6only;
 852                 break;
 853
 854         case IPV6_RECVPKTINFO:
 855                 val = np->rxopt.bits.rxinfo;
 856                 break;
 857
 858         case IPV6_2292PKTINFO:
 859                 val = np->rxopt.bits.rxoinfo;
 860                 break;
 861
 862         case IPV6_RECVHOPLIMIT:
 863                 val = np->rxopt.bits.rxhlim;
 864                 break;
 865
 866         case IPV6_2292HOPLIMIT:
 867                 val = np->rxopt.bits.rxohlim;
 868                 break;
 869
 870         case IPV6_RECVRTHDR:
 871                 val = np->rxopt.bits.srcrt;
 872                 break;
 873
 874         case IPV6_2292RTHDR:
 875                 val = np->rxopt.bits.osrcrt;
 876                 break;
 877
 878         case IPV6_HOPOPTS:
 879         case IPV6_RTHDRDSTOPTS:
 880         case IPV6_RTHDR:
 881         case IPV6_DSTOPTS:
 882         {
 883
 884                 lock_sock(sk);
 885                 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
 886                                              optval, len);
 887                 release_sock(sk);
 888                 return put_user(len, optlen);
 889         }
 890
 891         case IPV6_RECVHOPOPTS:
 892                 val = np->rxopt.bits.hopopts;
 893                 break;
 894
 895         case IPV6_2292HOPOPTS:
 896                 val = np->rxopt.bits.ohopopts;
 897                 break;
 898
 899         case IPV6_RECVDSTOPTS:
 900                 val = np->rxopt.bits.dstopts;
 901                 break;
 902
 903         case IPV6_2292DSTOPTS:
 904                 val = np->rxopt.bits.odstopts;
 905                 break;
 906
 907         case IPV6_TCLASS:
 908                 val = np->tclass;
 909                 break;
 910
 911         case IPV6_RECVTCLASS:
 912                 val = np->rxopt.bits.rxtclass;
 913                 break;
 914
 915         case IPV6_FLOWINFO:
 916                 val = np->rxopt.bits.rxflow;
 917                 break;
 918
 919         case IPV6_UNICAST_HOPS:
 920                 val = np->hop_limit;
 921                 break;
 922
 923         case IPV6_MULTICAST_HOPS:
 924                 val = np->mcast_hops;
 925                 break;
 926
 927         case IPV6_MULTICAST_LOOP:
 928                 val = np->mc_loop;
 929                 break;
 930
 931         case IPV6_MULTICAST_IF:
 932                 val = np->mcast_oif;
 933                 break;
 934
 935         case IPV6_MTU_DISCOVER:
 936                 val = np->pmtudisc;
 937                 break;
 938
 939         case IPV6_RECVERR:
 940                 val = np->recverr;
 941                 break;
 942
 943         case IPV6_FLOWINFO_SEND:
 944                 val = np->sndflow;
 945                 break;
 946
 947         default:
 948                 return -EINVAL;
 949         }
 950         len = min_t(unsigned int, sizeof(int), len);
 951         if(put_user(len, optlen))
 952                 return -EFAULT;
 953         if(copy_to_user(optval,&val,len))
 954                 return -EFAULT;
 955         return 0;
 956 }
 957
 958 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 959                     char __user *optval, int __user *optlen)
 960 {
 961         int err;
 962
 963         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 964                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 965
 966         if(level != SOL_IPV6)
 967                 return -ENOPROTOOPT;
 968
 969         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
 970 #ifdef CONFIG_NETFILTER
 971         /* we need to exclude all possible EINVALs except default case */
 972         if (err == -EINVAL && optname != IPV6_ADDRFORM &&
 973                         optname != MCAST_MSFILTER) {
 974                 int len;
 975
 976                 if (get_user(len, optlen))
 977                         return -EFAULT;
 978
 979                 lock_sock(sk);
 980                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
 981                                 &len);
 982                 release_sock(sk);
 983                 if (err >= 0)
 984                         err = put_user(len, optlen);
 985         }
 986 #endif
 987         return err;
 988 }
 989
 990 #ifdef CONFIG_COMPAT
 991 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
 992                            char __user *optval, int __user *optlen)
 993 {
 994         int err;
 995
 996         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 997                 if (udp_prot.compat_getsockopt != NULL)
 998                         return udp_prot.compat_getsockopt(sk, level, optname,
 999                                                           optval, optlen);
1000                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1001         }
1002
1003         if (level != SOL_IPV6)
1004                 return -ENOPROTOOPT;
1005
1006         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1007 #ifdef CONFIG_NETFILTER
1008         /* we need to exclude all possible EINVALs except default case */
1009         if (err == -EINVAL && optname != IPV6_ADDRFORM &&
1010                         optname != MCAST_MSFILTER) {
1011                 int len;
1012
1013                 if (get_user(len, optlen))
1014                         return -EFAULT;
1015
1016                 lock_sock(sk);
1017                 err = compat_nf_getsockopt(sk, PF_INET6,
1018                                            optname, optval, &len);
1019                 release_sock(sk);
1020                 if (err >= 0)
1021                         err = put_user(len, optlen);
1022         }
1023 #endif
1024         return err;
1025 }
1026
1027 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1028 #endif
1029
1030 void __init ipv6_packet_init(void)
1031 {
1032         dev_add_pack(&ipv6_packet_type);
1033 }
1034
1035 void ipv6_packet_cleanup(void)
1036 {
1037         dev_remove_pack(&ipv6_packet_type);
1038 }