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       Return -EINVAL for setsockopt of short lengths
  20  *      o       Truncate getsockopt returns
  21  *      o       Return an optlen of the truncated length if need be
  22  *
  23  *      Changes:
  24  *      David L Stevens <dlstevens@us.ibm.com>:
  25  *              - added multicast source filtering API for MLDv2
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/capability.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/socket.h>
  33 #include <linux/sockios.h>
  34 #include <linux/sched.h>
  35 #include <linux/net.h>
  36 #include <linux/in6.h>
  37 #include <linux/netdevice.h>
  38 #include <linux/if_arp.h>
  39 #include <linux/init.h>
  40 #include <linux/sysctl.h>
  41 #include <linux/netfilter.h>
  42
  43 #include <net/sock.h>
  44 #include <net/snmp.h>
  45 #include <net/ipv6.h>
  46 #include <net/ndisc.h>
  47 #include <net/protocol.h>
  48 #include <net/transp_v6.h>
  49 #include <net/ip6_route.h>
  50 #include <net/addrconf.h>
  51 #include <net/inet_common.h>
  52 #include <net/tcp.h>
  53 #include <net/udp.h>
  54 #include <net/xfrm.h>
  55
  56 #include <asm/uaccess.h>
  57
  58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  59
  60 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
  61 {
  62         struct sk_buff *segs = ERR_PTR(-EINVAL);
  63         struct ipv6hdr *ipv6h;
  64         struct inet6_protocol *ops;
  65         int proto;
  66
  67         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
  68                 goto out;
  69
  70         ipv6h = skb->nh.ipv6h;
  71         proto = ipv6h->nexthdr;
  72         __skb_pull(skb, sizeof(*ipv6h));
  73
  74         rcu_read_lock();
  75         for (;;) {
  76                 struct ipv6_opt_hdr *opth;
  77                 int len;
  78
  79                 if (proto != NEXTHDR_HOP) {
  80                         ops = rcu_dereference(inet6_protos[proto]);
  81
  82                         if (unlikely(!ops))
  83                                 goto unlock;
  84
  85                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
  86                                 break;
  87                 }
  88
  89                 if (unlikely(!pskb_may_pull(skb, 8)))
  90                         goto unlock;
  91
  92                 opth = (void *)skb->data;
  93                 len = opth->hdrlen * 8 + 8;
  94
  95                 if (unlikely(!pskb_may_pull(skb, len)))
  96                         goto unlock;
  97
  98                 proto = opth->nexthdr;
  99                 __skb_pull(skb, len);
 100         }
 101
 102         skb->h.raw = skb->data;
 103         if (likely(ops->gso_segment))
 104                 segs = ops->gso_segment(skb, features);
 105
 106 unlock:
 107         rcu_read_unlock();
 108
 109         if (unlikely(IS_ERR(segs)))
 110                 goto out;
 111
 112         for (skb = segs; skb; skb = skb->next) {
 113                 ipv6h = skb->nh.ipv6h;
 114                 ipv6h->payload_len = htons(skb->len - skb->mac_len);
 115         }
 116
 117 out:
 118         return segs;
 119 }
 120
 121 static struct packet_type ipv6_packet_type = {
 122         .type = __constant_htons(ETH_P_IPV6),
 123         .func = ipv6_rcv,
 124         .gso_segment = ipv6_gso_segment,
 125 };
 126
 127 struct ip6_ra_chain *ip6_ra_chain;
 128 DEFINE_RWLOCK(ip6_ra_lock);
 129
 130 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
 131 {
 132         struct ip6_ra_chain *ra, *new_ra, **rap;
 133
 134         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
 135         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
 136                 return -EINVAL;
 137
 138         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
 139
 140         write_lock_bh(&ip6_ra_lock);
 141         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
 142                 if (ra->sk == sk) {
 143                         if (sel>=0) {
 144                                 write_unlock_bh(&ip6_ra_lock);
 145                                 kfree(new_ra);
 146                                 return -EADDRINUSE;
 147                         }
 148
 149                         *rap = ra->next;
 150                         write_unlock_bh(&ip6_ra_lock);
 151
 152                         if (ra->destructor)
 153                                 ra->destructor(sk);
 154                         sock_put(sk);
 155                         kfree(ra);
 156                         return 0;
 157                 }
 158         }
 159         if (new_ra == NULL) {
 160                 write_unlock_bh(&ip6_ra_lock);
 161                 return -ENOBUFS;
 162         }
 163         new_ra->sk = sk;
 164         new_ra->sel = sel;
 165         new_ra->destructor = destructor;
 166         new_ra->next = ra;
 167         *rap = new_ra;
 168         sock_hold(sk);
 169         write_unlock_bh(&ip6_ra_lock);
 170         return 0;
 171 }
 172
 173 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 174                     char __user *optval, int optlen)
 175 {
 176         struct ipv6_pinfo *np = inet6_sk(sk);
 177         int val, valbool;
 178         int retv = -ENOPROTOOPT;
 179
 180         if (optval == NULL)
 181                 val=0;
 182         else if (get_user(val, (int __user *) optval))
 183                 return -EFAULT;
 184
 185         valbool = (val!=0);
 186
 187         lock_sock(sk);
 188
 189         switch (optname) {
 190
 191         case IPV6_ADDRFORM:
 192                 if (val == PF_INET) {
 193                         struct ipv6_txoptions *opt;
 194                         struct sk_buff *pktopt;
 195
 196                         if (sk->sk_protocol != IPPROTO_UDP &&
 197                             sk->sk_protocol != IPPROTO_TCP)
 198                                 break;
 199
 200                         if (sk->sk_state != TCP_ESTABLISHED) {
 201                                 retv = -ENOTCONN;
 202                                 break;
 203                         }
 204
 205                         if (ipv6_only_sock(sk) ||
 206                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 207                                 retv = -EADDRNOTAVAIL;
 208                                 break;
 209                         }
 210
 211                         fl6_free_socklist(sk);
 212                         ipv6_sock_mc_close(sk);
 213
 214                         /*
 215                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 216                          * remove it from the refcnt debug socks count in the
 217                          * original family...
 218                          */
 219                         sk_refcnt_debug_dec(sk);
 220
 221                         if (sk->sk_protocol == IPPROTO_TCP) {
 222                                 struct inet_connection_sock *icsk = inet_csk(sk);
 223
 224                                 local_bh_disable();
 225                                 sock_prot_dec_use(sk->sk_prot);
 226                                 sock_prot_inc_use(&tcp_prot);
 227                                 local_bh_enable();
 228                                 sk->sk_prot = &tcp_prot;
 229                                 icsk->icsk_af_ops = &ipv4_specific;
 230                                 sk->sk_socket->ops = &inet_stream_ops;
 231                                 sk->sk_family = PF_INET;
 232                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 233                         } else {
 234                                 local_bh_disable();
 235                                 sock_prot_dec_use(sk->sk_prot);
 236                                 sock_prot_inc_use(&udp_prot);
 237                                 local_bh_enable();
 238                                 sk->sk_prot = &udp_prot;
 239                                 sk->sk_socket->ops = &inet_dgram_ops;
 240                                 sk->sk_family = PF_INET;
 241                         }
 242                         opt = xchg(&np->opt, NULL);
 243                         if (opt)
 244                                 sock_kfree_s(sk, opt, opt->tot_len);
 245                         pktopt = xchg(&np->pktoptions, NULL);
 246                         if (pktopt)
 247                                 kfree_skb(pktopt);
 248
 249                         sk->sk_destruct = inet_sock_destruct;
 250                         /*
 251                          * ... and add it to the refcnt debug socks count
 252                          * in the new family. -acme
 253                          */
 254                         sk_refcnt_debug_inc(sk);
 255                         module_put(THIS_MODULE);
 256                         retv = 0;
 257                         break;
 258                 }
 259                 goto e_inval;
 260
 261         case IPV6_V6ONLY:
 262                 if (inet_sk(sk)->num)
 263                         goto e_inval;
 264                 np->ipv6only = valbool;
 265                 retv = 0;
 266                 break;
 267
 268         case IPV6_RECVPKTINFO:
 269                 np->rxopt.bits.rxinfo = valbool;
 270                 retv = 0;
 271                 break;
 272
 273         case IPV6_2292PKTINFO:
 274                 np->rxopt.bits.rxoinfo = valbool;
 275                 retv = 0;
 276                 break;
 277
 278         case IPV6_RECVHOPLIMIT:
 279                 np->rxopt.bits.rxhlim = valbool;
 280                 retv = 0;
 281                 break;
 282
 283         case IPV6_2292HOPLIMIT:
 284                 np->rxopt.bits.rxohlim = valbool;
 285                 retv = 0;
 286                 break;
 287
 288         case IPV6_RECVRTHDR:
 289                 if (val < 0 || val > 2)
 290                         goto e_inval;
 291                 np->rxopt.bits.srcrt = val;
 292                 retv = 0;
 293                 break;
 294
 295         case IPV6_2292RTHDR:
 296                 if (val < 0 || val > 2)
 297                         goto e_inval;
 298                 np->rxopt.bits.osrcrt = val;
 299                 retv = 0;
 300                 break;
 301
 302         case IPV6_RECVHOPOPTS:
 303                 np->rxopt.bits.hopopts = valbool;
 304                 retv = 0;
 305                 break;
 306
 307         case IPV6_2292HOPOPTS:
 308                 np->rxopt.bits.ohopopts = valbool;
 309                 retv = 0;
 310                 break;
 311
 312         case IPV6_RECVDSTOPTS:
 313                 np->rxopt.bits.dstopts = valbool;
 314                 retv = 0;
 315                 break;
 316
 317         case IPV6_2292DSTOPTS:
 318                 np->rxopt.bits.odstopts = valbool;
 319                 retv = 0;
 320                 break;
 321
 322         case IPV6_TCLASS:
 323                 if (val < 0 || val > 0xff)
 324                         goto e_inval;
 325                 np->tclass = val;
 326                 retv = 0;
 327                 break;
 328
 329         case IPV6_RECVTCLASS:
 330                 np->rxopt.bits.rxtclass = valbool;
 331                 retv = 0;
 332                 break;
 333
 334         case IPV6_FLOWINFO:
 335                 np->rxopt.bits.rxflow = valbool;
 336                 retv = 0;
 337                 break;
 338
 339         case IPV6_HOPOPTS:
 340         case IPV6_RTHDRDSTOPTS:
 341         case IPV6_RTHDR:
 342         case IPV6_DSTOPTS:
 343         {
 344                 struct ipv6_txoptions *opt;
 345                 if (optlen == 0)
 346                         optval = NULL;
 347
 348                 /* hop-by-hop / destination options are privileged option */
 349                 retv = -EPERM;
 350                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 351                         break;
 352
 353                 retv = -EINVAL;
 354                 if (optlen & 0x7 || optlen > 8 * 255)
 355                         break;
 356
 357                 opt = ipv6_renew_options(sk, np->opt, optname,
 358                                          (struct ipv6_opt_hdr __user *)optval,
 359                                          optlen);
 360                 if (IS_ERR(opt)) {
 361                         retv = PTR_ERR(opt);
 362                         break;
 363                 }
 364
 365                 /* routing header option needs extra check */
 366                 if (optname == IPV6_RTHDR && opt->srcrt) {
 367                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 368                         if (rthdr->type)
 369                                 goto sticky_done;
 370                         if ((rthdr->hdrlen & 1) ||
 371                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 372                                 goto sticky_done;
 373                 }
 374
 375                 retv = 0;
 376                 if (inet_sk(sk)->is_icsk) {
 377                         if (opt) {
 378                                 struct inet_connection_sock *icsk = inet_csk(sk);
 379                                 if (!((1 << sk->sk_state) &
 380                                       (TCPF_LISTEN | TCPF_CLOSE))
 381                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 382                                         icsk->icsk_ext_hdr_len =
 383                                                 opt->opt_flen + opt->opt_nflen;
 384                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 385                                 }
 386                         }
 387                         opt = xchg(&np->opt, opt);
 388                         sk_dst_reset(sk);
 389                 } else {
 390                         write_lock(&sk->sk_dst_lock);
 391                         opt = xchg(&np->opt, opt);
 392                         write_unlock(&sk->sk_dst_lock);
 393                         sk_dst_reset(sk);
 394                 }
 395 sticky_done:
 396                 if (opt)
 397                         sock_kfree_s(sk, opt, opt->tot_len);
 398                 break;
 399         }
 400
 401         case IPV6_2292PKTOPTIONS:
 402         {
 403                 struct ipv6_txoptions *opt = NULL;
 404                 struct msghdr msg;
 405                 struct flowi fl;
 406                 int junk;
 407
 408                 fl.fl6_flowlabel = 0;
 409                 fl.oif = sk->sk_bound_dev_if;
 410
 411                 if (optlen == 0)
 412                         goto update;
 413
 414                 /* 1K is probably excessive
 415                  * 1K is surely not enough, 2K per standard header is 16K.
 416                  */
 417                 retv = -EINVAL;
 418                 if (optlen > 64*1024)
 419                         break;
 420
 421                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 422                 retv = -ENOBUFS;
 423                 if (opt == NULL)
 424                         break;
 425
 426                 memset(opt, 0, sizeof(*opt));
 427                 opt->tot_len = sizeof(*opt) + optlen;
 428                 retv = -EFAULT;
 429                 if (copy_from_user(opt+1, optval, optlen))
 430                         goto done;
 431
 432                 msg.msg_controllen = optlen;
 433                 msg.msg_control = (void*)(opt+1);
 434
 435                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 436                 if (retv)
 437                         goto done;
 438 update:
 439                 retv = 0;
 440                 if (inet_sk(sk)->is_icsk) {
 441                         if (opt) {
 442                                 struct inet_connection_sock *icsk = inet_csk(sk);
 443                                 if (!((1 << sk->sk_state) &
 444                                       (TCPF_LISTEN | TCPF_CLOSE))
 445                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 446                                         icsk->icsk_ext_hdr_len =
 447                                                 opt->opt_flen + opt->opt_nflen;
 448                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 449                                 }
 450                         }
 451                         opt = xchg(&np->opt, opt);
 452                         sk_dst_reset(sk);
 453                 } else {
 454                         write_lock(&sk->sk_dst_lock);
 455                         opt = xchg(&np->opt, opt);
 456                         write_unlock(&sk->sk_dst_lock);
 457                         sk_dst_reset(sk);
 458                 }
 459
 460 done:
 461                 if (opt)
 462                         sock_kfree_s(sk, opt, opt->tot_len);
 463                 break;
 464         }
 465         case IPV6_UNICAST_HOPS:
 466                 if (val > 255 || val < -1)
 467                         goto e_inval;
 468                 np->hop_limit = val;
 469                 retv = 0;
 470                 break;
 471
 472         case IPV6_MULTICAST_HOPS:
 473                 if (sk->sk_type == SOCK_STREAM)
 474                         goto e_inval;
 475                 if (val > 255 || val < -1)
 476                         goto e_inval;
 477                 np->mcast_hops = val;
 478                 retv = 0;
 479                 break;
 480
 481         case IPV6_MULTICAST_LOOP:
 482                 np->mc_loop = valbool;
 483                 retv = 0;
 484                 break;
 485
 486         case IPV6_MULTICAST_IF:
 487                 if (sk->sk_type == SOCK_STREAM)
 488                         goto e_inval;
 489                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 490                         goto e_inval;
 491
 492                 if (__dev_get_by_index(val) == NULL) {
 493                         retv = -ENODEV;
 494                         break;
 495                 }
 496                 np->mcast_oif = val;
 497                 retv = 0;
 498                 break;
 499         case IPV6_ADD_MEMBERSHIP:
 500         case IPV6_DROP_MEMBERSHIP:
 501         {
 502                 struct ipv6_mreq mreq;
 503
 504                 retv = -EFAULT;
 505                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 506                         break;
 507
 508                 if (optname == IPV6_ADD_MEMBERSHIP)
 509                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 510                 else
 511                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 512                 break;
 513         }
 514         case IPV6_JOIN_ANYCAST:
 515         case IPV6_LEAVE_ANYCAST:
 516         {
 517                 struct ipv6_mreq mreq;
 518
 519                 if (optlen != sizeof(struct ipv6_mreq))
 520                         goto e_inval;
 521
 522                 retv = -EFAULT;
 523                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 524                         break;
 525
 526                 if (optname == IPV6_JOIN_ANYCAST)
 527                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 528                 else
 529                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 530                 break;
 531         }
 532         case MCAST_JOIN_GROUP:
 533         case MCAST_LEAVE_GROUP:
 534         {
 535                 struct group_req greq;
 536                 struct sockaddr_in6 *psin6;
 537
 538                 retv = -EFAULT;
 539                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 540                         break;
 541                 if (greq.gr_group.ss_family != AF_INET6) {
 542                         retv = -EADDRNOTAVAIL;
 543                         break;
 544                 }
 545                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 546                 if (optname == MCAST_JOIN_GROUP)
 547                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 548                                 &psin6->sin6_addr);
 549                 else
 550                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 551                                 &psin6->sin6_addr);
 552                 break;
 553         }
 554         case MCAST_JOIN_SOURCE_GROUP:
 555         case MCAST_LEAVE_SOURCE_GROUP:
 556         case MCAST_BLOCK_SOURCE:
 557         case MCAST_UNBLOCK_SOURCE:
 558         {
 559                 struct group_source_req greqs;
 560                 int omode, add;
 561
 562                 if (optlen != sizeof(struct group_source_req))
 563                         goto e_inval;
 564                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 565                         retv = -EFAULT;
 566                         break;
 567                 }
 568                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 569                     greqs.gsr_source.ss_family != AF_INET6) {
 570                         retv = -EADDRNOTAVAIL;
 571                         break;
 572                 }
 573                 if (optname == MCAST_BLOCK_SOURCE) {
 574                         omode = MCAST_EXCLUDE;
 575                         add = 1;
 576                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 577                         omode = MCAST_EXCLUDE;
 578                         add = 0;
 579                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 580                         struct sockaddr_in6 *psin6;
 581
 582                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 583                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 584                                 &psin6->sin6_addr);
 585                         /* prior join w/ different source is ok */
 586                         if (retv && retv != -EADDRINUSE)
 587                                 break;
 588                         omode = MCAST_INCLUDE;
 589                         add = 1;
 590                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 591                         omode = MCAST_INCLUDE;
 592                         add = 0;
 593                 }
 594                 retv = ip6_mc_source(add, omode, sk, &greqs);
 595                 break;
 596         }
 597         case MCAST_MSFILTER:
 598         {
 599                 extern int sysctl_mld_max_msf;
 600                 struct group_filter *gsf;
 601
 602                 if (optlen < GROUP_FILTER_SIZE(0))
 603                         goto e_inval;
 604                 if (optlen > sysctl_optmem_max) {
 605                         retv = -ENOBUFS;
 606                         break;
 607                 }
 608                 gsf = kmalloc(optlen,GFP_KERNEL);
 609                 if (gsf == 0) {
 610                         retv = -ENOBUFS;
 611                         break;
 612                 }
 613                 retv = -EFAULT;
 614                 if (copy_from_user(gsf, optval, optlen)) {
 615                         kfree(gsf);
 616                         break;
 617                 }
 618                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 619                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 620                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 621                         kfree(gsf);
 622                         retv = -ENOBUFS;
 623                         break;
 624                 }
 625                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 626                         kfree(gsf);
 627                         retv = -EINVAL;
 628                         break;
 629                 }
 630                 retv = ip6_mc_msfilter(sk, gsf);
 631                 kfree(gsf);
 632
 633                 break;
 634         }
 635         case IPV6_ROUTER_ALERT:
 636                 retv = ip6_ra_control(sk, val, NULL);
 637                 break;
 638         case IPV6_MTU_DISCOVER:
 639                 if (val<0 || val>2)
 640                         goto e_inval;
 641                 np->pmtudisc = val;
 642                 retv = 0;
 643                 break;
 644         case IPV6_MTU:
 645                 if (val && val < IPV6_MIN_MTU)
 646                         goto e_inval;
 647                 np->frag_size = val;
 648                 retv = 0;
 649                 break;
 650         case IPV6_RECVERR:
 651                 np->recverr = valbool;
 652                 if (!val)
 653                         skb_queue_purge(&sk->sk_error_queue);
 654                 retv = 0;
 655                 break;
 656         case IPV6_FLOWINFO_SEND:
 657                 np->sndflow = valbool;
 658                 retv = 0;
 659                 break;
 660         case IPV6_FLOWLABEL_MGR:
 661                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 662                 break;
 663         case IPV6_IPSEC_POLICY:
 664         case IPV6_XFRM_POLICY:
 665                 retv = -EPERM;
 666                 if (!capable(CAP_NET_ADMIN))
 667                         break;
 668                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 669                 break;
 670
 671         }
 672         release_sock(sk);
 673
 674         return retv;
 675
 676 e_inval:
 677         release_sock(sk);
 678         return -EINVAL;
 679 }
 680
 681 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 682                     char __user *optval, int optlen)
 683 {
 684         int err;
 685
 686         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 687                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 688
 689         if (level != SOL_IPV6)
 690                 return -ENOPROTOOPT;
 691
 692         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 693 #ifdef CONFIG_NETFILTER
 694         /* we need to exclude all possible ENOPROTOOPTs except default case */
 695         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 696                         optname != IPV6_XFRM_POLICY) {
 697                 lock_sock(sk);
 698                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 699                                 optlen);
 700                 release_sock(sk);
 701         }
 702 #endif
 703         return err;
 704 }
 705
 706
 707 #ifdef CONFIG_COMPAT
 708 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 709                            char __user *optval, int optlen)
 710 {
 711         int err;
 712
 713         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 714                 if (udp_prot.compat_setsockopt != NULL)
 715                         return udp_prot.compat_setsockopt(sk, level, optname,
 716                                                           optval, optlen);
 717                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 718         }
 719
 720         if (level != SOL_IPV6)
 721                 return -ENOPROTOOPT;
 722
 723         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 724 #ifdef CONFIG_NETFILTER
 725         /* we need to exclude all possible ENOPROTOOPTs except default case */
 726         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 727             optname != IPV6_XFRM_POLICY) {
 728                 lock_sock(sk);
 729                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 730                                            optval, optlen);
 731                 release_sock(sk);
 732         }
 733 #endif
 734         return err;
 735 }
 736
 737 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 738 #endif
 739
 740 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
 741                                   char __user *optval, int len)
 742 {
 743         if (!hdr)
 744                 return 0;
 745         len = min_t(int, len, ipv6_optlen(hdr));
 746         if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
 747                 return -EFAULT;
 748         return len;
 749 }
 750
 751 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 752                     char __user *optval, int __user *optlen)
 753 {
 754         struct ipv6_pinfo *np = inet6_sk(sk);
 755         int len;
 756         int val;
 757
 758         if (get_user(len, optlen))
 759                 return -EFAULT;
 760         switch (optname) {
 761         case IPV6_ADDRFORM:
 762                 if (sk->sk_protocol != IPPROTO_UDP &&
 763                     sk->sk_protocol != IPPROTO_TCP)
 764                         return -EINVAL;
 765                 if (sk->sk_state != TCP_ESTABLISHED)
 766                         return -ENOTCONN;
 767                 val = sk->sk_family;
 768                 break;
 769         case MCAST_MSFILTER:
 770         {
 771                 struct group_filter gsf;
 772                 int err;
 773
 774                 if (len < GROUP_FILTER_SIZE(0))
 775                         return -EINVAL;
 776                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 777                         return -EFAULT;
 778                 lock_sock(sk);
 779                 err = ip6_mc_msfget(sk, &gsf,
 780                         (struct group_filter __user *)optval, optlen);
 781                 release_sock(sk);
 782                 return err;
 783         }
 784
 785         case IPV6_2292PKTOPTIONS:
 786         {
 787                 struct msghdr msg;
 788                 struct sk_buff *skb;
 789
 790                 if (sk->sk_type != SOCK_STREAM)
 791                         return -ENOPROTOOPT;
 792
 793                 msg.msg_control = optval;
 794                 msg.msg_controllen = len;
 795                 msg.msg_flags = 0;
 796
 797                 lock_sock(sk);
 798                 skb = np->pktoptions;
 799                 if (skb)
 800                         atomic_inc(&skb->users);
 801                 release_sock(sk);
 802
 803                 if (skb) {
 804                         int err = datagram_recv_ctl(sk, &msg, skb);
 805                         kfree_skb(skb);
 806                         if (err)
 807                                 return err;
 808                 } else {
 809                         if (np->rxopt.bits.rxinfo) {
 810                                 struct in6_pktinfo src_info;
 811                                 src_info.ipi6_ifindex = np->mcast_oif;
 812                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 813                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 814                         }
 815                         if (np->rxopt.bits.rxhlim) {
 816                                 int hlim = np->mcast_hops;
 817                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 818                         }
 819                         if (np->rxopt.bits.rxoinfo) {
 820                                 struct in6_pktinfo src_info;
 821                                 src_info.ipi6_ifindex = np->mcast_oif;
 822                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 823                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 824                         }
 825                         if (np->rxopt.bits.rxohlim) {
 826                                 int hlim = np->mcast_hops;
 827                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 828                         }
 829                 }
 830                 len -= msg.msg_controllen;
 831                 return put_user(len, optlen);
 832         }
 833         case IPV6_MTU:
 834         {
 835                 struct dst_entry *dst;
 836                 val = 0;
 837                 lock_sock(sk);
 838                 dst = sk_dst_get(sk);
 839                 if (dst) {
 840                         val = dst_mtu(dst);
 841                         dst_release(dst);
 842                 }
 843                 release_sock(sk);
 844                 if (!val)
 845                         return -ENOTCONN;
 846                 break;
 847         }
 848
 849         case IPV6_V6ONLY:
 850                 val = np->ipv6only;
 851                 break;
 852
 853         case IPV6_RECVPKTINFO:
 854                 val = np->rxopt.bits.rxinfo;
 855                 break;
 856
 857         case IPV6_2292PKTINFO:
 858                 val = np->rxopt.bits.rxoinfo;
 859                 break;
 860
 861         case IPV6_RECVHOPLIMIT:
 862                 val = np->rxopt.bits.rxhlim;
 863                 break;
 864
 865         case IPV6_2292HOPLIMIT:
 866                 val = np->rxopt.bits.rxohlim;
 867                 break;
 868
 869         case IPV6_RECVRTHDR:
 870                 val = np->rxopt.bits.srcrt;
 871                 break;
 872
 873         case IPV6_2292RTHDR:
 874                 val = np->rxopt.bits.osrcrt;
 875                 break;
 876
 877         case IPV6_HOPOPTS:
 878         case IPV6_RTHDRDSTOPTS:
 879         case IPV6_RTHDR:
 880         case IPV6_DSTOPTS:
 881         {
 882
 883                 lock_sock(sk);
 884                 len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
 885                                              optval, len);
 886                 release_sock(sk);
 887                 return put_user(len, optlen);
 888         }
 889
 890         case IPV6_RECVHOPOPTS:
 891                 val = np->rxopt.bits.hopopts;
 892                 break;
 893
 894         case IPV6_2292HOPOPTS:
 895                 val = np->rxopt.bits.ohopopts;
 896                 break;
 897
 898         case IPV6_RECVDSTOPTS:
 899                 val = np->rxopt.bits.dstopts;
 900                 break;
 901
 902         case IPV6_2292DSTOPTS:
 903                 val = np->rxopt.bits.odstopts;
 904                 break;
 905
 906         case IPV6_TCLASS:
 907                 val = np->tclass;
 908                 break;
 909
 910         case IPV6_RECVTCLASS:
 911                 val = np->rxopt.bits.rxtclass;
 912                 break;
 913
 914         case IPV6_FLOWINFO:
 915                 val = np->rxopt.bits.rxflow;
 916                 break;
 917
 918         case IPV6_UNICAST_HOPS:
 919                 val = np->hop_limit;
 920                 break;
 921
 922         case IPV6_MULTICAST_HOPS:
 923                 val = np->mcast_hops;
 924                 break;
 925
 926         case IPV6_MULTICAST_LOOP:
 927                 val = np->mc_loop;
 928                 break;
 929
 930         case IPV6_MULTICAST_IF:
 931                 val = np->mcast_oif;
 932                 break;
 933
 934         case IPV6_MTU_DISCOVER:
 935                 val = np->pmtudisc;
 936                 break;
 937
 938         case IPV6_RECVERR:
 939                 val = np->recverr;
 940                 break;
 941
 942         case IPV6_FLOWINFO_SEND:
 943                 val = np->sndflow;
 944                 break;
 945
 946         default:
 947                 return -EINVAL;
 948         }
 949         len = min_t(unsigned int, sizeof(int), len);
 950         if(put_user(len, optlen))
 951                 return -EFAULT;
 952         if(copy_to_user(optval,&val,len))
 953                 return -EFAULT;
 954         return 0;
 955 }
 956
 957 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 958                     char __user *optval, int __user *optlen)
 959 {
 960         int err;
 961
 962         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 963                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 964
 965         if(level != SOL_IPV6)
 966                 return -ENOPROTOOPT;
 967
 968         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
 969 #ifdef CONFIG_NETFILTER
 970         /* we need to exclude all possible EINVALs except default case */
 971         if (err == -EINVAL && optname != IPV6_ADDRFORM &&
 972                         optname != MCAST_MSFILTER) {
 973                 int len;
 974
 975                 if (get_user(len, optlen))
 976                         return -EFAULT;
 977
 978                 lock_sock(sk);
 979                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
 980                                 &len);
 981                 release_sock(sk);
 982                 if (err >= 0)
 983                         err = put_user(len, optlen);
 984         }
 985 #endif
 986         return err;
 987 }
 988
 989 #ifdef CONFIG_COMPAT
 990 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
 991                            char __user *optval, int __user *optlen)
 992 {
 993         int err;
 994
 995         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 996                 if (udp_prot.compat_getsockopt != NULL)
 997                         return udp_prot.compat_getsockopt(sk, level, optname,
 998                                                           optval, optlen);
 999                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1000         }
1001
1002         if (level != SOL_IPV6)
1003                 return -ENOPROTOOPT;
1004
1005         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1006 #ifdef CONFIG_NETFILTER
1007         /* we need to exclude all possible EINVALs except default case */
1008         if (err == -EINVAL && optname != IPV6_ADDRFORM &&
1009                         optname != MCAST_MSFILTER) {
1010                 int len;
1011
1012                 if (get_user(len, optlen))
1013                         return -EFAULT;
1014
1015                 lock_sock(sk);
1016                 err = compat_nf_getsockopt(sk, PF_INET6,
1017                                            optname, optval, &len);
1018                 release_sock(sk);
1019                 if (err >= 0)
1020                         err = put_user(len, optlen);
1021         }
1022 #endif
1023         return err;
1024 }
1025
1026 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1027 #endif
1028
1029 void __init ipv6_packet_init(void)
1030 {
1031         dev_add_pack(&ipv6_packet_type);
1032 }
1033
1034 void ipv6_packet_cleanup(void)
1035 {
1036         dev_remove_pack(&ipv6_packet_type);
1037 }