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   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  *      FIXME: Make the setsockopt code POSIX compliant: That is
  18  *
  19  *      o       Return -EINVAL for setsockopt of short lengths
  20  *      o       Truncate getsockopt returns
  21  *      o       Return an optlen of the truncated length if need be
  22  *
  23  *      Changes:
  24  *      David L Stevens <dlstevens@us.ibm.com>:
  25  *              - added multicast source filtering API for MLDv2
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/capability.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/socket.h>
  33 #include <linux/sockios.h>
  34 #include <linux/net.h>
  35 #include <linux/in6.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/if_arp.h>
  38 #include <linux/init.h>
  39 #include <linux/sysctl.h>
  40 #include <linux/netfilter.h>
  41
  42 #include <net/sock.h>
  43 #include <net/snmp.h>
  44 #include <net/ipv6.h>
  45 #include <net/ndisc.h>
  46 #include <net/protocol.h>
  47 #include <net/transp_v6.h>
  48 #include <net/ip6_route.h>
  49 #include <net/addrconf.h>
  50 #include <net/inet_common.h>
  51 #include <net/tcp.h>
  52 #include <net/udp.h>
  53 #include <net/udplite.h>
  54 #include <net/xfrm.h>
  55
  56 #include <asm/uaccess.h>
  57
  58 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  59
  60 static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
  61                                                     int proto)
  62 {
  63         struct inet6_protocol *ops = NULL;
  64
  65         for (;;) {
  66                 struct ipv6_opt_hdr *opth;
  67                 int len;
  68
  69                 if (proto != NEXTHDR_HOP) {
  70                         ops = rcu_dereference(inet6_protos[proto]);
  71
  72                         if (unlikely(!ops))
  73                                 break;
  74
  75                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
  76                                 break;
  77                 }
  78
  79                 if (unlikely(!pskb_may_pull(skb, 8)))
  80                         break;
  81
  82                 opth = (void *)skb->data;
  83                 len = opth->hdrlen * 8 + 8;
  84
  85                 if (unlikely(!pskb_may_pull(skb, len)))
  86                         break;
  87
  88                 proto = opth->nexthdr;
  89                 __skb_pull(skb, len);
  90         }
  91
  92         return ops;
  93 }
  94
  95 static int ipv6_gso_send_check(struct sk_buff *skb)
  96 {
  97         struct ipv6hdr *ipv6h;
  98         struct inet6_protocol *ops;
  99         int err = -EINVAL;
 100
 101         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 102                 goto out;
 103
 104         ipv6h = ipv6_hdr(skb);
 105         __skb_pull(skb, sizeof(*ipv6h));
 106         err = -EPROTONOSUPPORT;
 107
 108         rcu_read_lock();
 109         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 110         if (likely(ops && ops->gso_send_check)) {
 111                 skb_reset_transport_header(skb);
 112                 err = ops->gso_send_check(skb);
 113         }
 114         rcu_read_unlock();
 115
 116 out:
 117         return err;
 118 }
 119
 120 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
 121 {
 122         struct sk_buff *segs = ERR_PTR(-EINVAL);
 123         struct ipv6hdr *ipv6h;
 124         struct inet6_protocol *ops;
 125
 126         if (!(features & NETIF_F_V6_CSUM))
 127                 features &= ~NETIF_F_SG;
 128
 129         if (unlikely(skb_shinfo(skb)->gso_type &
 130                      ~(SKB_GSO_UDP |
 131                        SKB_GSO_DODGY |
 132                        SKB_GSO_TCP_ECN |
 133                        SKB_GSO_TCPV6 |
 134                        0)))
 135                 goto out;
 136
 137         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 138                 goto out;
 139
 140         ipv6h = ipv6_hdr(skb);
 141         __skb_pull(skb, sizeof(*ipv6h));
 142         segs = ERR_PTR(-EPROTONOSUPPORT);
 143
 144         rcu_read_lock();
 145         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 146         if (likely(ops && ops->gso_segment)) {
 147                 skb_reset_transport_header(skb);
 148                 segs = ops->gso_segment(skb, features);
 149         }
 150         rcu_read_unlock();
 151
 152         if (unlikely(IS_ERR(segs)))
 153                 goto out;
 154
 155         for (skb = segs; skb; skb = skb->next) {
 156                 ipv6h = ipv6_hdr(skb);
 157                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
 158                                            sizeof(*ipv6h));
 159         }
 160
 161 out:
 162         return segs;
 163 }
 164
 165 static struct packet_type ipv6_packet_type = {
 166         .type = __constant_htons(ETH_P_IPV6),
 167         .func = ipv6_rcv,
 168         .gso_send_check = ipv6_gso_send_check,
 169         .gso_segment = ipv6_gso_segment,
 170 };
 171
 172 struct ip6_ra_chain *ip6_ra_chain;
 173 DEFINE_RWLOCK(ip6_ra_lock);
 174
 175 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
 176 {
 177         struct ip6_ra_chain *ra, *new_ra, **rap;
 178
 179         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
 180         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
 181                 return -EINVAL;
 182
 183         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
 184
 185         write_lock_bh(&ip6_ra_lock);
 186         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
 187                 if (ra->sk == sk) {
 188                         if (sel>=0) {
 189                                 write_unlock_bh(&ip6_ra_lock);
 190                                 kfree(new_ra);
 191                                 return -EADDRINUSE;
 192                         }
 193
 194                         *rap = ra->next;
 195                         write_unlock_bh(&ip6_ra_lock);
 196
 197                         if (ra->destructor)
 198                                 ra->destructor(sk);
 199                         sock_put(sk);
 200                         kfree(ra);
 201                         return 0;
 202                 }
 203         }
 204         if (new_ra == NULL) {
 205                 write_unlock_bh(&ip6_ra_lock);
 206                 return -ENOBUFS;
 207         }
 208         new_ra->sk = sk;
 209         new_ra->sel = sel;
 210         new_ra->destructor = destructor;
 211         new_ra->next = ra;
 212         *rap = new_ra;
 213         sock_hold(sk);
 214         write_unlock_bh(&ip6_ra_lock);
 215         return 0;
 216 }
 217
 218 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 219                     char __user *optval, int optlen)
 220 {
 221         struct ipv6_pinfo *np = inet6_sk(sk);
 222         int val, valbool;
 223         int retv = -ENOPROTOOPT;
 224
 225         if (optval == NULL)
 226                 val=0;
 227         else if (get_user(val, (int __user *) optval))
 228                 return -EFAULT;
 229
 230         valbool = (val!=0);
 231
 232         lock_sock(sk);
 233
 234         switch (optname) {
 235
 236         case IPV6_ADDRFORM:
 237                 if (val == PF_INET) {
 238                         struct ipv6_txoptions *opt;
 239                         struct sk_buff *pktopt;
 240
 241                         if (sk->sk_protocol != IPPROTO_UDP &&
 242 #ifdef CONFIG_IP_UDPLITE
 243                             sk->sk_protocol != IPPROTO_UDPLITE &&
 244 #endif
 245                             sk->sk_protocol != IPPROTO_TCP)
 246                                 break;
 247
 248                         if (sk->sk_state != TCP_ESTABLISHED) {
 249                                 retv = -ENOTCONN;
 250                                 break;
 251                         }
 252
 253                         if (ipv6_only_sock(sk) ||
 254                             !ipv6_addr_v4mapped(&np->daddr)) {
 255                                 retv = -EADDRNOTAVAIL;
 256                                 break;
 257                         }
 258
 259                         fl6_free_socklist(sk);
 260                         ipv6_sock_mc_close(sk);
 261
 262                         /*
 263                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 264                          * remove it from the refcnt debug socks count in the
 265                          * original family...
 266                          */
 267                         sk_refcnt_debug_dec(sk);
 268
 269                         if (sk->sk_protocol == IPPROTO_TCP) {
 270                                 struct inet_connection_sock *icsk = inet_csk(sk);
 271
 272                                 local_bh_disable();
 273                                 sock_prot_inuse_add(sk->sk_prot, -1);
 274                                 sock_prot_inuse_add(&tcp_prot, 1);
 275                                 local_bh_enable();
 276                                 sk->sk_prot = &tcp_prot;
 277                                 icsk->icsk_af_ops = &ipv4_specific;
 278                                 sk->sk_socket->ops = &inet_stream_ops;
 279                                 sk->sk_family = PF_INET;
 280                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 281                         } else {
 282                                 struct proto *prot = &udp_prot;
 283
 284                                 if (IS_PROTO_UDPLITE(sk->sk_protocol))
 285                                         prot = &udplite_prot;
 286                                 local_bh_disable();
 287                                 sock_prot_inuse_add(sk->sk_prot, -1);
 288                                 sock_prot_inuse_add(prot, 1);
 289                                 local_bh_enable();
 290                                 sk->sk_prot = prot;
 291                                 sk->sk_socket->ops = &inet_dgram_ops;
 292                                 sk->sk_family = PF_INET;
 293                         }
 294                         opt = xchg(&np->opt, NULL);
 295                         if (opt)
 296                                 sock_kfree_s(sk, opt, opt->tot_len);
 297                         pktopt = xchg(&np->pktoptions, NULL);
 298                         if (pktopt)
 299                                 kfree_skb(pktopt);
 300
 301                         sk->sk_destruct = inet_sock_destruct;
 302                         /*
 303                          * ... and add it to the refcnt debug socks count
 304                          * in the new family. -acme
 305                          */
 306                         sk_refcnt_debug_inc(sk);
 307                         module_put(THIS_MODULE);
 308                         retv = 0;
 309                         break;
 310                 }
 311                 goto e_inval;
 312
 313         case IPV6_V6ONLY:
 314                 if (inet_sk(sk)->num)
 315                         goto e_inval;
 316                 np->ipv6only = valbool;
 317                 retv = 0;
 318                 break;
 319
 320         case IPV6_RECVPKTINFO:
 321                 np->rxopt.bits.rxinfo = valbool;
 322                 retv = 0;
 323                 break;
 324
 325         case IPV6_2292PKTINFO:
 326                 np->rxopt.bits.rxoinfo = valbool;
 327                 retv = 0;
 328                 break;
 329
 330         case IPV6_RECVHOPLIMIT:
 331                 np->rxopt.bits.rxhlim = valbool;
 332                 retv = 0;
 333                 break;
 334
 335         case IPV6_2292HOPLIMIT:
 336                 np->rxopt.bits.rxohlim = valbool;
 337                 retv = 0;
 338                 break;
 339
 340         case IPV6_RECVRTHDR:
 341                 np->rxopt.bits.srcrt = valbool;
 342                 retv = 0;
 343                 break;
 344
 345         case IPV6_2292RTHDR:
 346                 np->rxopt.bits.osrcrt = valbool;
 347                 retv = 0;
 348                 break;
 349
 350         case IPV6_RECVHOPOPTS:
 351                 np->rxopt.bits.hopopts = valbool;
 352                 retv = 0;
 353                 break;
 354
 355         case IPV6_2292HOPOPTS:
 356                 np->rxopt.bits.ohopopts = valbool;
 357                 retv = 0;
 358                 break;
 359
 360         case IPV6_RECVDSTOPTS:
 361                 np->rxopt.bits.dstopts = valbool;
 362                 retv = 0;
 363                 break;
 364
 365         case IPV6_2292DSTOPTS:
 366                 np->rxopt.bits.odstopts = valbool;
 367                 retv = 0;
 368                 break;
 369
 370         case IPV6_TCLASS:
 371                 if (val < -1 || val > 0xff)
 372                         goto e_inval;
 373                 np->tclass = val;
 374                 retv = 0;
 375                 break;
 376
 377         case IPV6_RECVTCLASS:
 378                 np->rxopt.bits.rxtclass = valbool;
 379                 retv = 0;
 380                 break;
 381
 382         case IPV6_FLOWINFO:
 383                 np->rxopt.bits.rxflow = valbool;
 384                 retv = 0;
 385                 break;
 386
 387         case IPV6_HOPOPTS:
 388         case IPV6_RTHDRDSTOPTS:
 389         case IPV6_RTHDR:
 390         case IPV6_DSTOPTS:
 391         {
 392                 struct ipv6_txoptions *opt;
 393                 if (optlen == 0)
 394                         optval = NULL;
 395
 396                 /* hop-by-hop / destination options are privileged option */
 397                 retv = -EPERM;
 398                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 399                         break;
 400
 401                 retv = -EINVAL;
 402                 if (optlen & 0x7 || optlen > 8 * 255)
 403                         break;
 404
 405                 opt = ipv6_renew_options(sk, np->opt, optname,
 406                                          (struct ipv6_opt_hdr __user *)optval,
 407                                          optlen);
 408                 if (IS_ERR(opt)) {
 409                         retv = PTR_ERR(opt);
 410                         break;
 411                 }
 412
 413                 /* routing header option needs extra check */
 414                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 415                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 416                         switch (rthdr->type) {
 417 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 418                         case IPV6_SRCRT_TYPE_2:
 419                                 break;
 420 #endif
 421                         default:
 422                                 goto sticky_done;
 423                         }
 424
 425                         if ((rthdr->hdrlen & 1) ||
 426                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 427                                 goto sticky_done;
 428                 }
 429
 430                 retv = 0;
 431                 if (inet_sk(sk)->is_icsk) {
 432                         if (opt) {
 433                                 struct inet_connection_sock *icsk = inet_csk(sk);
 434                                 if (!((1 << sk->sk_state) &
 435                                       (TCPF_LISTEN | TCPF_CLOSE))
 436                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 437                                         icsk->icsk_ext_hdr_len =
 438                                                 opt->opt_flen + opt->opt_nflen;
 439                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 440                                 }
 441                         }
 442                         opt = xchg(&np->opt, opt);
 443                         sk_dst_reset(sk);
 444                 } else {
 445                         write_lock(&sk->sk_dst_lock);
 446                         opt = xchg(&np->opt, opt);
 447                         write_unlock(&sk->sk_dst_lock);
 448                         sk_dst_reset(sk);
 449                 }
 450 sticky_done:
 451                 if (opt)
 452                         sock_kfree_s(sk, opt, opt->tot_len);
 453                 break;
 454         }
 455
 456         case IPV6_2292PKTOPTIONS:
 457         {
 458                 struct ipv6_txoptions *opt = NULL;
 459                 struct msghdr msg;
 460                 struct flowi fl;
 461                 int junk;
 462
 463                 fl.fl6_flowlabel = 0;
 464                 fl.oif = sk->sk_bound_dev_if;
 465
 466                 if (optlen == 0)
 467                         goto update;
 468
 469                 /* 1K is probably excessive
 470                  * 1K is surely not enough, 2K per standard header is 16K.
 471                  */
 472                 retv = -EINVAL;
 473                 if (optlen > 64*1024)
 474                         break;
 475
 476                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 477                 retv = -ENOBUFS;
 478                 if (opt == NULL)
 479                         break;
 480
 481                 memset(opt, 0, sizeof(*opt));
 482                 opt->tot_len = sizeof(*opt) + optlen;
 483                 retv = -EFAULT;
 484                 if (copy_from_user(opt+1, optval, optlen))
 485                         goto done;
 486
 487                 msg.msg_controllen = optlen;
 488                 msg.msg_control = (void*)(opt+1);
 489
 490                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 491                 if (retv)
 492                         goto done;
 493 update:
 494                 retv = 0;
 495                 if (inet_sk(sk)->is_icsk) {
 496                         if (opt) {
 497                                 struct inet_connection_sock *icsk = inet_csk(sk);
 498                                 if (!((1 << sk->sk_state) &
 499                                       (TCPF_LISTEN | TCPF_CLOSE))
 500                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 501                                         icsk->icsk_ext_hdr_len =
 502                                                 opt->opt_flen + opt->opt_nflen;
 503                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 504                                 }
 505                         }
 506                         opt = xchg(&np->opt, opt);
 507                         sk_dst_reset(sk);
 508                 } else {
 509                         write_lock(&sk->sk_dst_lock);
 510                         opt = xchg(&np->opt, opt);
 511                         write_unlock(&sk->sk_dst_lock);
 512                         sk_dst_reset(sk);
 513                 }
 514
 515 done:
 516                 if (opt)
 517                         sock_kfree_s(sk, opt, opt->tot_len);
 518                 break;
 519         }
 520         case IPV6_UNICAST_HOPS:
 521                 if (val > 255 || val < -1)
 522                         goto e_inval;
 523                 np->hop_limit = val;
 524                 retv = 0;
 525                 break;
 526
 527         case IPV6_MULTICAST_HOPS:
 528                 if (sk->sk_type == SOCK_STREAM)
 529                         goto e_inval;
 530                 if (val > 255 || val < -1)
 531                         goto e_inval;
 532                 np->mcast_hops = val;
 533                 retv = 0;
 534                 break;
 535
 536         case IPV6_MULTICAST_LOOP:
 537                 np->mc_loop = valbool;
 538                 retv = 0;
 539                 break;
 540
 541         case IPV6_MULTICAST_IF:
 542                 if (sk->sk_type == SOCK_STREAM)
 543                         goto e_inval;
 544
 545                 if (val) {
 546                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 547                                 goto e_inval;
 548
 549                         if (__dev_get_by_index(&init_net, val) == NULL) {
 550                                 retv = -ENODEV;
 551                                 break;
 552                         }
 553                 }
 554                 np->mcast_oif = val;
 555                 retv = 0;
 556                 break;
 557         case IPV6_ADD_MEMBERSHIP:
 558         case IPV6_DROP_MEMBERSHIP:
 559         {
 560                 struct ipv6_mreq mreq;
 561
 562                 retv = -EPROTO;
 563                 if (inet_sk(sk)->is_icsk)
 564                         break;
 565
 566                 retv = -EFAULT;
 567                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 568                         break;
 569
 570                 if (optname == IPV6_ADD_MEMBERSHIP)
 571                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 572                 else
 573                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 574                 break;
 575         }
 576         case IPV6_JOIN_ANYCAST:
 577         case IPV6_LEAVE_ANYCAST:
 578         {
 579                 struct ipv6_mreq mreq;
 580
 581                 if (optlen != sizeof(struct ipv6_mreq))
 582                         goto e_inval;
 583
 584                 retv = -EFAULT;
 585                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 586                         break;
 587
 588                 if (optname == IPV6_JOIN_ANYCAST)
 589                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 590                 else
 591                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 592                 break;
 593         }
 594         case MCAST_JOIN_GROUP:
 595         case MCAST_LEAVE_GROUP:
 596         {
 597                 struct group_req greq;
 598                 struct sockaddr_in6 *psin6;
 599
 600                 retv = -EFAULT;
 601                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 602                         break;
 603                 if (greq.gr_group.ss_family != AF_INET6) {
 604                         retv = -EADDRNOTAVAIL;
 605                         break;
 606                 }
 607                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 608                 if (optname == MCAST_JOIN_GROUP)
 609                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 610                                 &psin6->sin6_addr);
 611                 else
 612                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 613                                 &psin6->sin6_addr);
 614                 break;
 615         }
 616         case MCAST_JOIN_SOURCE_GROUP:
 617         case MCAST_LEAVE_SOURCE_GROUP:
 618         case MCAST_BLOCK_SOURCE:
 619         case MCAST_UNBLOCK_SOURCE:
 620         {
 621                 struct group_source_req greqs;
 622                 int omode, add;
 623
 624                 if (optlen != sizeof(struct group_source_req))
 625                         goto e_inval;
 626                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 627                         retv = -EFAULT;
 628                         break;
 629                 }
 630                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 631                     greqs.gsr_source.ss_family != AF_INET6) {
 632                         retv = -EADDRNOTAVAIL;
 633                         break;
 634                 }
 635                 if (optname == MCAST_BLOCK_SOURCE) {
 636                         omode = MCAST_EXCLUDE;
 637                         add = 1;
 638                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 639                         omode = MCAST_EXCLUDE;
 640                         add = 0;
 641                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 642                         struct sockaddr_in6 *psin6;
 643
 644                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 645                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 646                                 &psin6->sin6_addr);
 647                         /* prior join w/ different source is ok */
 648                         if (retv && retv != -EADDRINUSE)
 649                                 break;
 650                         omode = MCAST_INCLUDE;
 651                         add = 1;
 652                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 653                         omode = MCAST_INCLUDE;
 654                         add = 0;
 655                 }
 656                 retv = ip6_mc_source(add, omode, sk, &greqs);
 657                 break;
 658         }
 659         case MCAST_MSFILTER:
 660         {
 661                 extern int sysctl_mld_max_msf;
 662                 struct group_filter *gsf;
 663
 664                 if (optlen < GROUP_FILTER_SIZE(0))
 665                         goto e_inval;
 666                 if (optlen > sysctl_optmem_max) {
 667                         retv = -ENOBUFS;
 668                         break;
 669                 }
 670                 gsf = kmalloc(optlen,GFP_KERNEL);
 671                 if (!gsf) {
 672                         retv = -ENOBUFS;
 673                         break;
 674                 }
 675                 retv = -EFAULT;
 676                 if (copy_from_user(gsf, optval, optlen)) {
 677                         kfree(gsf);
 678                         break;
 679                 }
 680                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 681                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 682                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 683                         kfree(gsf);
 684                         retv = -ENOBUFS;
 685                         break;
 686                 }
 687                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 688                         kfree(gsf);
 689                         retv = -EINVAL;
 690                         break;
 691                 }
 692                 retv = ip6_mc_msfilter(sk, gsf);
 693                 kfree(gsf);
 694
 695                 break;
 696         }
 697         case IPV6_ROUTER_ALERT:
 698                 retv = ip6_ra_control(sk, val, NULL);
 699                 break;
 700         case IPV6_MTU_DISCOVER:
 701                 if (val<0 || val>3)
 702                         goto e_inval;
 703                 np->pmtudisc = val;
 704                 retv = 0;
 705                 break;
 706         case IPV6_MTU:
 707                 if (val && val < IPV6_MIN_MTU)
 708                         goto e_inval;
 709                 np->frag_size = val;
 710                 retv = 0;
 711                 break;
 712         case IPV6_RECVERR:
 713                 np->recverr = valbool;
 714                 if (!val)
 715                         skb_queue_purge(&sk->sk_error_queue);
 716                 retv = 0;
 717                 break;
 718         case IPV6_FLOWINFO_SEND:
 719                 np->sndflow = valbool;
 720                 retv = 0;
 721                 break;
 722         case IPV6_FLOWLABEL_MGR:
 723                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 724                 break;
 725         case IPV6_IPSEC_POLICY:
 726         case IPV6_XFRM_POLICY:
 727                 retv = -EPERM;
 728                 if (!capable(CAP_NET_ADMIN))
 729                         break;
 730                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 731                 break;
 732
 733         }
 734         release_sock(sk);
 735
 736         return retv;
 737
 738 e_inval:
 739         release_sock(sk);
 740         return -EINVAL;
 741 }
 742
 743 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 744                     char __user *optval, int optlen)
 745 {
 746         int err;
 747
 748         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 749                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 750
 751         if (level != SOL_IPV6)
 752                 return -ENOPROTOOPT;
 753
 754         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 755 #ifdef CONFIG_NETFILTER
 756         /* we need to exclude all possible ENOPROTOOPTs except default case */
 757         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 758                         optname != IPV6_XFRM_POLICY) {
 759                 lock_sock(sk);
 760                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 761                                 optlen);
 762                 release_sock(sk);
 763         }
 764 #endif
 765         return err;
 766 }
 767
 768 EXPORT_SYMBOL(ipv6_setsockopt);
 769
 770 #ifdef CONFIG_COMPAT
 771 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 772                            char __user *optval, int optlen)
 773 {
 774         int err;
 775
 776         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 777                 if (udp_prot.compat_setsockopt != NULL)
 778                         return udp_prot.compat_setsockopt(sk, level, optname,
 779                                                           optval, optlen);
 780                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 781         }
 782
 783         if (level != SOL_IPV6)
 784                 return -ENOPROTOOPT;
 785
 786         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 787 #ifdef CONFIG_NETFILTER
 788         /* we need to exclude all possible ENOPROTOOPTs except default case */
 789         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 790             optname != IPV6_XFRM_POLICY) {
 791                 lock_sock(sk);
 792                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 793                                            optval, optlen);
 794                 release_sock(sk);
 795         }
 796 #endif
 797         return err;
 798 }
 799
 800 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 801 #endif
 802
 803 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 804                                   int optname, char __user *optval, int len)
 805 {
 806         struct ipv6_opt_hdr *hdr;
 807
 808         if (!opt)
 809                 return 0;
 810
 811         switch(optname) {
 812         case IPV6_HOPOPTS:
 813                 hdr = opt->hopopt;
 814                 break;
 815         case IPV6_RTHDRDSTOPTS:
 816                 hdr = opt->dst0opt;
 817                 break;
 818         case IPV6_RTHDR:
 819                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 820                 break;
 821         case IPV6_DSTOPTS:
 822                 hdr = opt->dst1opt;
 823                 break;
 824         default:
 825                 return -EINVAL; /* should not happen */
 826         }
 827
 828         if (!hdr)
 829                 return 0;
 830
 831         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 832         if (copy_to_user(optval, hdr, len))
 833                 return -EFAULT;
 834         return ipv6_optlen(hdr);
 835 }
 836
 837 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 838                     char __user *optval, int __user *optlen)
 839 {
 840         struct ipv6_pinfo *np = inet6_sk(sk);
 841         int len;
 842         int val;
 843
 844         if (get_user(len, optlen))
 845                 return -EFAULT;
 846         switch (optname) {
 847         case IPV6_ADDRFORM:
 848                 if (sk->sk_protocol != IPPROTO_UDP &&
 849 #ifdef CONFIG_IP_UDPLITE
 850                     sk->sk_protocol != IPPROTO_UDPLITE &&
 851 #endif
 852                     sk->sk_protocol != IPPROTO_TCP)
 853                         return -EINVAL;
 854                 if (sk->sk_state != TCP_ESTABLISHED)
 855                         return -ENOTCONN;
 856                 val = sk->sk_family;
 857                 break;
 858         case MCAST_MSFILTER:
 859         {
 860                 struct group_filter gsf;
 861                 int err;
 862
 863                 if (len < GROUP_FILTER_SIZE(0))
 864                         return -EINVAL;
 865                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 866                         return -EFAULT;
 867                 lock_sock(sk);
 868                 err = ip6_mc_msfget(sk, &gsf,
 869                         (struct group_filter __user *)optval, optlen);
 870                 release_sock(sk);
 871                 return err;
 872         }
 873
 874         case IPV6_2292PKTOPTIONS:
 875         {
 876                 struct msghdr msg;
 877                 struct sk_buff *skb;
 878
 879                 if (sk->sk_type != SOCK_STREAM)
 880                         return -ENOPROTOOPT;
 881
 882                 msg.msg_control = optval;
 883                 msg.msg_controllen = len;
 884                 msg.msg_flags = 0;
 885
 886                 lock_sock(sk);
 887                 skb = np->pktoptions;
 888                 if (skb)
 889                         atomic_inc(&skb->users);
 890                 release_sock(sk);
 891
 892                 if (skb) {
 893                         int err = datagram_recv_ctl(sk, &msg, skb);
 894                         kfree_skb(skb);
 895                         if (err)
 896                                 return err;
 897                 } else {
 898                         if (np->rxopt.bits.rxinfo) {
 899                                 struct in6_pktinfo src_info;
 900                                 src_info.ipi6_ifindex = np->mcast_oif;
 901                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 902                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 903                         }
 904                         if (np->rxopt.bits.rxhlim) {
 905                                 int hlim = np->mcast_hops;
 906                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 907                         }
 908                         if (np->rxopt.bits.rxoinfo) {
 909                                 struct in6_pktinfo src_info;
 910                                 src_info.ipi6_ifindex = np->mcast_oif;
 911                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 912                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 913                         }
 914                         if (np->rxopt.bits.rxohlim) {
 915                                 int hlim = np->mcast_hops;
 916                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 917                         }
 918                 }
 919                 len -= msg.msg_controllen;
 920                 return put_user(len, optlen);
 921         }
 922         case IPV6_MTU:
 923         {
 924                 struct dst_entry *dst;
 925                 val = 0;
 926                 lock_sock(sk);
 927                 dst = sk_dst_get(sk);
 928                 if (dst) {
 929                         val = dst_mtu(dst);
 930                         dst_release(dst);
 931                 }
 932                 release_sock(sk);
 933                 if (!val)
 934                         return -ENOTCONN;
 935                 break;
 936         }
 937
 938         case IPV6_V6ONLY:
 939                 val = np->ipv6only;
 940                 break;
 941
 942         case IPV6_RECVPKTINFO:
 943                 val = np->rxopt.bits.rxinfo;
 944                 break;
 945
 946         case IPV6_2292PKTINFO:
 947                 val = np->rxopt.bits.rxoinfo;
 948                 break;
 949
 950         case IPV6_RECVHOPLIMIT:
 951                 val = np->rxopt.bits.rxhlim;
 952                 break;
 953
 954         case IPV6_2292HOPLIMIT:
 955                 val = np->rxopt.bits.rxohlim;
 956                 break;
 957
 958         case IPV6_RECVRTHDR:
 959                 val = np->rxopt.bits.srcrt;
 960                 break;
 961
 962         case IPV6_2292RTHDR:
 963                 val = np->rxopt.bits.osrcrt;
 964                 break;
 965
 966         case IPV6_HOPOPTS:
 967         case IPV6_RTHDRDSTOPTS:
 968         case IPV6_RTHDR:
 969         case IPV6_DSTOPTS:
 970         {
 971
 972                 lock_sock(sk);
 973                 len = ipv6_getsockopt_sticky(sk, np->opt,
 974                                              optname, optval, len);
 975                 release_sock(sk);
 976                 return put_user(len, optlen);
 977         }
 978
 979         case IPV6_RECVHOPOPTS:
 980                 val = np->rxopt.bits.hopopts;
 981                 break;
 982
 983         case IPV6_2292HOPOPTS:
 984                 val = np->rxopt.bits.ohopopts;
 985                 break;
 986
 987         case IPV6_RECVDSTOPTS:
 988                 val = np->rxopt.bits.dstopts;
 989                 break;
 990
 991         case IPV6_2292DSTOPTS:
 992                 val = np->rxopt.bits.odstopts;
 993                 break;
 994
 995         case IPV6_TCLASS:
 996                 val = np->tclass;
 997                 if (val < 0)
 998                         val = 0;
 999                 break;
1000
1001         case IPV6_RECVTCLASS:
1002                 val = np->rxopt.bits.rxtclass;
1003                 break;
1004
1005         case IPV6_FLOWINFO:
1006                 val = np->rxopt.bits.rxflow;
1007                 break;
1008
1009         case IPV6_UNICAST_HOPS:
1010         case IPV6_MULTICAST_HOPS:
1011         {
1012                 struct dst_entry *dst;
1013
1014                 if (optname == IPV6_UNICAST_HOPS)
1015                         val = np->hop_limit;
1016                 else
1017                         val = np->mcast_hops;
1018
1019                 dst = sk_dst_get(sk);
1020                 if (dst) {
1021                         if (val < 0)
1022                                 val = dst_metric(dst, RTAX_HOPLIMIT);
1023                         if (val < 0)
1024                                 val = ipv6_get_hoplimit(dst->dev);
1025                         dst_release(dst);
1026                 }
1027                 if (val < 0)
1028                         val = ipv6_devconf.hop_limit;
1029                 break;
1030         }
1031
1032         case IPV6_MULTICAST_LOOP:
1033                 val = np->mc_loop;
1034                 break;
1035
1036         case IPV6_MULTICAST_IF:
1037                 val = np->mcast_oif;
1038                 break;
1039
1040         case IPV6_MTU_DISCOVER:
1041                 val = np->pmtudisc;
1042                 break;
1043
1044         case IPV6_RECVERR:
1045                 val = np->recverr;
1046                 break;
1047
1048         case IPV6_FLOWINFO_SEND:
1049                 val = np->sndflow;
1050                 break;
1051
1052         default:
1053                 return -ENOPROTOOPT;
1054         }
1055         len = min_t(unsigned int, sizeof(int), len);
1056         if(put_user(len, optlen))
1057                 return -EFAULT;
1058         if(copy_to_user(optval,&val,len))
1059                 return -EFAULT;
1060         return 0;
1061 }
1062
1063 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1064                     char __user *optval, int __user *optlen)
1065 {
1066         int err;
1067
1068         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1069                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1070
1071         if(level != SOL_IPV6)
1072                 return -ENOPROTOOPT;
1073
1074         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1075 #ifdef CONFIG_NETFILTER
1076         /* we need to exclude all possible ENOPROTOOPTs except default case */
1077         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1078                 int len;
1079
1080                 if (get_user(len, optlen))
1081                         return -EFAULT;
1082
1083                 lock_sock(sk);
1084                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1085                                 &len);
1086                 release_sock(sk);
1087                 if (err >= 0)
1088                         err = put_user(len, optlen);
1089         }
1090 #endif
1091         return err;
1092 }
1093
1094 EXPORT_SYMBOL(ipv6_getsockopt);
1095
1096 #ifdef CONFIG_COMPAT
1097 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1098                            char __user *optval, int __user *optlen)
1099 {
1100         int err;
1101
1102         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1103                 if (udp_prot.compat_getsockopt != NULL)
1104                         return udp_prot.compat_getsockopt(sk, level, optname,
1105                                                           optval, optlen);
1106                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1107         }
1108
1109         if (level != SOL_IPV6)
1110                 return -ENOPROTOOPT;
1111
1112         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1113 #ifdef CONFIG_NETFILTER
1114         /* we need to exclude all possible ENOPROTOOPTs except default case */
1115         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1116                 int len;
1117
1118                 if (get_user(len, optlen))
1119                         return -EFAULT;
1120
1121                 lock_sock(sk);
1122                 err = compat_nf_getsockopt(sk, PF_INET6,
1123                                            optname, optval, &len);
1124                 release_sock(sk);
1125                 if (err >= 0)
1126                         err = put_user(len, optlen);
1127         }
1128 #endif
1129         return err;
1130 }
1131
1132 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1133 #endif
1134
1135 int __init ipv6_packet_init(void)
1136 {
1137         dev_add_pack(&ipv6_packet_type);
1138         return 0;
1139 }
1140
1141 void ipv6_packet_cleanup(void)
1142 {
1143         dev_remove_pack(&ipv6_packet_type);
1144 }