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/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_HW_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                             sk->sk_protocol != IPPROTO_UDPLITE &&
 243                             sk->sk_protocol != IPPROTO_TCP)
 244                                 break;
 245
 246                         if (sk->sk_state != TCP_ESTABLISHED) {
 247                                 retv = -ENOTCONN;
 248                                 break;
 249                         }
 250
 251                         if (ipv6_only_sock(sk) ||
 252                             !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 253                                 retv = -EADDRNOTAVAIL;
 254                                 break;
 255                         }
 256
 257                         fl6_free_socklist(sk);
 258                         ipv6_sock_mc_close(sk);
 259
 260                         /*
 261                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 262                          * remove it from the refcnt debug socks count in the
 263                          * original family...
 264                          */
 265                         sk_refcnt_debug_dec(sk);
 266
 267                         if (sk->sk_protocol == IPPROTO_TCP) {
 268                                 struct inet_connection_sock *icsk = inet_csk(sk);
 269
 270                                 local_bh_disable();
 271                                 sock_prot_dec_use(sk->sk_prot);
 272                                 sock_prot_inc_use(&tcp_prot);
 273                                 local_bh_enable();
 274                                 sk->sk_prot = &tcp_prot;
 275                                 icsk->icsk_af_ops = &ipv4_specific;
 276                                 sk->sk_socket->ops = &inet_stream_ops;
 277                                 sk->sk_family = PF_INET;
 278                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 279                         } else {
 280                                 struct proto *prot = &udp_prot;
 281
 282                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 283                                         prot = &udplite_prot;
 284                                 local_bh_disable();
 285                                 sock_prot_dec_use(sk->sk_prot);
 286                                 sock_prot_inc_use(prot);
 287                                 local_bh_enable();
 288                                 sk->sk_prot = prot;
 289                                 sk->sk_socket->ops = &inet_dgram_ops;
 290                                 sk->sk_family = PF_INET;
 291                         }
 292                         opt = xchg(&np->opt, NULL);
 293                         if (opt)
 294                                 sock_kfree_s(sk, opt, opt->tot_len);
 295                         pktopt = xchg(&np->pktoptions, NULL);
 296                         if (pktopt)
 297                                 kfree_skb(pktopt);
 298
 299                         sk->sk_destruct = inet_sock_destruct;
 300                         /*
 301                          * ... and add it to the refcnt debug socks count
 302                          * in the new family. -acme
 303                          */
 304                         sk_refcnt_debug_inc(sk);
 305                         module_put(THIS_MODULE);
 306                         retv = 0;
 307                         break;
 308                 }
 309                 goto e_inval;
 310
 311         case IPV6_V6ONLY:
 312                 if (inet_sk(sk)->num)
 313                         goto e_inval;
 314                 np->ipv6only = valbool;
 315                 retv = 0;
 316                 break;
 317
 318         case IPV6_RECVPKTINFO:
 319                 np->rxopt.bits.rxinfo = valbool;
 320                 retv = 0;
 321                 break;
 322
 323         case IPV6_2292PKTINFO:
 324                 np->rxopt.bits.rxoinfo = valbool;
 325                 retv = 0;
 326                 break;
 327
 328         case IPV6_RECVHOPLIMIT:
 329                 np->rxopt.bits.rxhlim = valbool;
 330                 retv = 0;
 331                 break;
 332
 333         case IPV6_2292HOPLIMIT:
 334                 np->rxopt.bits.rxohlim = valbool;
 335                 retv = 0;
 336                 break;
 337
 338         case IPV6_RECVRTHDR:
 339                 if (val < 0 || val > 2)
 340                         goto e_inval;
 341                 np->rxopt.bits.srcrt = val;
 342                 retv = 0;
 343                 break;
 344
 345         case IPV6_2292RTHDR:
 346                 if (val < 0 || val > 2)
 347                         goto e_inval;
 348                 np->rxopt.bits.osrcrt = val;
 349                 retv = 0;
 350                 break;
 351
 352         case IPV6_RECVHOPOPTS:
 353                 np->rxopt.bits.hopopts = valbool;
 354                 retv = 0;
 355                 break;
 356
 357         case IPV6_2292HOPOPTS:
 358                 np->rxopt.bits.ohopopts = valbool;
 359                 retv = 0;
 360                 break;
 361
 362         case IPV6_RECVDSTOPTS:
 363                 np->rxopt.bits.dstopts = valbool;
 364                 retv = 0;
 365                 break;
 366
 367         case IPV6_2292DSTOPTS:
 368                 np->rxopt.bits.odstopts = valbool;
 369                 retv = 0;
 370                 break;
 371
 372         case IPV6_TCLASS:
 373                 if (val < -1 || val > 0xff)
 374                         goto e_inval;
 375                 np->tclass = val;
 376                 retv = 0;
 377                 break;
 378
 379         case IPV6_RECVTCLASS:
 380                 np->rxopt.bits.rxtclass = valbool;
 381                 retv = 0;
 382                 break;
 383
 384         case IPV6_FLOWINFO:
 385                 np->rxopt.bits.rxflow = valbool;
 386                 retv = 0;
 387                 break;
 388
 389         case IPV6_HOPOPTS:
 390         case IPV6_RTHDRDSTOPTS:
 391         case IPV6_RTHDR:
 392         case IPV6_DSTOPTS:
 393         {
 394                 struct ipv6_txoptions *opt;
 395                 if (optlen == 0)
 396                         optval = NULL;
 397
 398                 /* hop-by-hop / destination options are privileged option */
 399                 retv = -EPERM;
 400                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 401                         break;
 402
 403                 retv = -EINVAL;
 404                 if (optlen & 0x7 || optlen > 8 * 255)
 405                         break;
 406
 407                 opt = ipv6_renew_options(sk, np->opt, optname,
 408                                          (struct ipv6_opt_hdr __user *)optval,
 409                                          optlen);
 410                 if (IS_ERR(opt)) {
 411                         retv = PTR_ERR(opt);
 412                         break;
 413                 }
 414
 415                 /* routing header option needs extra check */
 416                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 417                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 418                         switch (rthdr->type) {
 419                         case IPV6_SRCRT_TYPE_0:
 420 #ifdef CONFIG_IPV6_MIP6
 421                         case IPV6_SRCRT_TYPE_2:
 422 #endif
 423                                 break;
 424                         default:
 425                                 goto sticky_done;
 426                         }
 427
 428                         if ((rthdr->hdrlen & 1) ||
 429                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 430                                 goto sticky_done;
 431                 }
 432
 433                 retv = 0;
 434                 if (inet_sk(sk)->is_icsk) {
 435                         if (opt) {
 436                                 struct inet_connection_sock *icsk = inet_csk(sk);
 437                                 if (!((1 << sk->sk_state) &
 438                                       (TCPF_LISTEN | TCPF_CLOSE))
 439                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 440                                         icsk->icsk_ext_hdr_len =
 441                                                 opt->opt_flen + opt->opt_nflen;
 442                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 443                                 }
 444                         }
 445                         opt = xchg(&np->opt, opt);
 446                         sk_dst_reset(sk);
 447                 } else {
 448                         write_lock(&sk->sk_dst_lock);
 449                         opt = xchg(&np->opt, opt);
 450                         write_unlock(&sk->sk_dst_lock);
 451                         sk_dst_reset(sk);
 452                 }
 453 sticky_done:
 454                 if (opt)
 455                         sock_kfree_s(sk, opt, opt->tot_len);
 456                 break;
 457         }
 458
 459         case IPV6_2292PKTOPTIONS:
 460         {
 461                 struct ipv6_txoptions *opt = NULL;
 462                 struct msghdr msg;
 463                 struct flowi fl;
 464                 int junk;
 465
 466                 fl.fl6_flowlabel = 0;
 467                 fl.oif = sk->sk_bound_dev_if;
 468
 469                 if (optlen == 0)
 470                         goto update;
 471
 472                 /* 1K is probably excessive
 473                  * 1K is surely not enough, 2K per standard header is 16K.
 474                  */
 475                 retv = -EINVAL;
 476                 if (optlen > 64*1024)
 477                         break;
 478
 479                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 480                 retv = -ENOBUFS;
 481                 if (opt == NULL)
 482                         break;
 483
 484                 memset(opt, 0, sizeof(*opt));
 485                 opt->tot_len = sizeof(*opt) + optlen;
 486                 retv = -EFAULT;
 487                 if (copy_from_user(opt+1, optval, optlen))
 488                         goto done;
 489
 490                 msg.msg_controllen = optlen;
 491                 msg.msg_control = (void*)(opt+1);
 492
 493                 retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
 494                 if (retv)
 495                         goto done;
 496 update:
 497                 retv = 0;
 498                 if (inet_sk(sk)->is_icsk) {
 499                         if (opt) {
 500                                 struct inet_connection_sock *icsk = inet_csk(sk);
 501                                 if (!((1 << sk->sk_state) &
 502                                       (TCPF_LISTEN | TCPF_CLOSE))
 503                                     && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 504                                         icsk->icsk_ext_hdr_len =
 505                                                 opt->opt_flen + opt->opt_nflen;
 506                                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 507                                 }
 508                         }
 509                         opt = xchg(&np->opt, opt);
 510                         sk_dst_reset(sk);
 511                 } else {
 512                         write_lock(&sk->sk_dst_lock);
 513                         opt = xchg(&np->opt, opt);
 514                         write_unlock(&sk->sk_dst_lock);
 515                         sk_dst_reset(sk);
 516                 }
 517
 518 done:
 519                 if (opt)
 520                         sock_kfree_s(sk, opt, opt->tot_len);
 521                 break;
 522         }
 523         case IPV6_UNICAST_HOPS:
 524                 if (val > 255 || val < -1)
 525                         goto e_inval;
 526                 np->hop_limit = val;
 527                 retv = 0;
 528                 break;
 529
 530         case IPV6_MULTICAST_HOPS:
 531                 if (sk->sk_type == SOCK_STREAM)
 532                         goto e_inval;
 533                 if (val > 255 || val < -1)
 534                         goto e_inval;
 535                 np->mcast_hops = val;
 536                 retv = 0;
 537                 break;
 538
 539         case IPV6_MULTICAST_LOOP:
 540                 np->mc_loop = valbool;
 541                 retv = 0;
 542                 break;
 543
 544         case IPV6_MULTICAST_IF:
 545                 if (sk->sk_type == SOCK_STREAM)
 546                         goto e_inval;
 547                 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 548                         goto e_inval;
 549
 550                 if (__dev_get_by_index(val) == NULL) {
 551                         retv = -ENODEV;
 552                         break;
 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 = -EFAULT;
 563                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 564                         break;
 565
 566                 if (optname == IPV6_ADD_MEMBERSHIP)
 567                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 568                 else
 569                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 570                 break;
 571         }
 572         case IPV6_JOIN_ANYCAST:
 573         case IPV6_LEAVE_ANYCAST:
 574         {
 575                 struct ipv6_mreq mreq;
 576
 577                 if (optlen != sizeof(struct ipv6_mreq))
 578                         goto e_inval;
 579
 580                 retv = -EFAULT;
 581                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 582                         break;
 583
 584                 if (optname == IPV6_JOIN_ANYCAST)
 585                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 586                 else
 587                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 588                 break;
 589         }
 590         case MCAST_JOIN_GROUP:
 591         case MCAST_LEAVE_GROUP:
 592         {
 593                 struct group_req greq;
 594                 struct sockaddr_in6 *psin6;
 595
 596                 retv = -EFAULT;
 597                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 598                         break;
 599                 if (greq.gr_group.ss_family != AF_INET6) {
 600                         retv = -EADDRNOTAVAIL;
 601                         break;
 602                 }
 603                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 604                 if (optname == MCAST_JOIN_GROUP)
 605                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 606                                 &psin6->sin6_addr);
 607                 else
 608                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 609                                 &psin6->sin6_addr);
 610                 break;
 611         }
 612         case MCAST_JOIN_SOURCE_GROUP:
 613         case MCAST_LEAVE_SOURCE_GROUP:
 614         case MCAST_BLOCK_SOURCE:
 615         case MCAST_UNBLOCK_SOURCE:
 616         {
 617                 struct group_source_req greqs;
 618                 int omode, add;
 619
 620                 if (optlen != sizeof(struct group_source_req))
 621                         goto e_inval;
 622                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 623                         retv = -EFAULT;
 624                         break;
 625                 }
 626                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 627                     greqs.gsr_source.ss_family != AF_INET6) {
 628                         retv = -EADDRNOTAVAIL;
 629                         break;
 630                 }
 631                 if (optname == MCAST_BLOCK_SOURCE) {
 632                         omode = MCAST_EXCLUDE;
 633                         add = 1;
 634                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 635                         omode = MCAST_EXCLUDE;
 636                         add = 0;
 637                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 638                         struct sockaddr_in6 *psin6;
 639
 640                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 641                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 642                                 &psin6->sin6_addr);
 643                         /* prior join w/ different source is ok */
 644                         if (retv && retv != -EADDRINUSE)
 645                                 break;
 646                         omode = MCAST_INCLUDE;
 647                         add = 1;
 648                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 649                         omode = MCAST_INCLUDE;
 650                         add = 0;
 651                 }
 652                 retv = ip6_mc_source(add, omode, sk, &greqs);
 653                 break;
 654         }
 655         case MCAST_MSFILTER:
 656         {
 657                 extern int sysctl_mld_max_msf;
 658                 struct group_filter *gsf;
 659
 660                 if (optlen < GROUP_FILTER_SIZE(0))
 661                         goto e_inval;
 662                 if (optlen > sysctl_optmem_max) {
 663                         retv = -ENOBUFS;
 664                         break;
 665                 }
 666                 gsf = kmalloc(optlen,GFP_KERNEL);
 667                 if (gsf == 0) {
 668                         retv = -ENOBUFS;
 669                         break;
 670                 }
 671                 retv = -EFAULT;
 672                 if (copy_from_user(gsf, optval, optlen)) {
 673                         kfree(gsf);
 674                         break;
 675                 }
 676                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 677                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 678                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 679                         kfree(gsf);
 680                         retv = -ENOBUFS;
 681                         break;
 682                 }
 683                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 684                         kfree(gsf);
 685                         retv = -EINVAL;
 686                         break;
 687                 }
 688                 retv = ip6_mc_msfilter(sk, gsf);
 689                 kfree(gsf);
 690
 691                 break;
 692         }
 693         case IPV6_ROUTER_ALERT:
 694                 retv = ip6_ra_control(sk, val, NULL);
 695                 break;
 696         case IPV6_MTU_DISCOVER:
 697                 if (val<0 || val>3)
 698                         goto e_inval;
 699                 np->pmtudisc = val;
 700                 retv = 0;
 701                 break;
 702         case IPV6_MTU:
 703                 if (val && val < IPV6_MIN_MTU)
 704                         goto e_inval;
 705                 np->frag_size = val;
 706                 retv = 0;
 707                 break;
 708         case IPV6_RECVERR:
 709                 np->recverr = valbool;
 710                 if (!val)
 711                         skb_queue_purge(&sk->sk_error_queue);
 712                 retv = 0;
 713                 break;
 714         case IPV6_FLOWINFO_SEND:
 715                 np->sndflow = valbool;
 716                 retv = 0;
 717                 break;
 718         case IPV6_FLOWLABEL_MGR:
 719                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 720                 break;
 721         case IPV6_IPSEC_POLICY:
 722         case IPV6_XFRM_POLICY:
 723                 retv = -EPERM;
 724                 if (!capable(CAP_NET_ADMIN))
 725                         break;
 726                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 727                 break;
 728
 729         }
 730         release_sock(sk);
 731
 732         return retv;
 733
 734 e_inval:
 735         release_sock(sk);
 736         return -EINVAL;
 737 }
 738
 739 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 740                     char __user *optval, int optlen)
 741 {
 742         int err;
 743
 744         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 745                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 746
 747         if (level != SOL_IPV6)
 748                 return -ENOPROTOOPT;
 749
 750         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 751 #ifdef CONFIG_NETFILTER
 752         /* we need to exclude all possible ENOPROTOOPTs except default case */
 753         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 754                         optname != IPV6_XFRM_POLICY) {
 755                 lock_sock(sk);
 756                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 757                                 optlen);
 758                 release_sock(sk);
 759         }
 760 #endif
 761         return err;
 762 }
 763
 764 EXPORT_SYMBOL(ipv6_setsockopt);
 765
 766 #ifdef CONFIG_COMPAT
 767 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 768                            char __user *optval, int optlen)
 769 {
 770         int err;
 771
 772         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 773                 if (udp_prot.compat_setsockopt != NULL)
 774                         return udp_prot.compat_setsockopt(sk, level, optname,
 775                                                           optval, optlen);
 776                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 777         }
 778
 779         if (level != SOL_IPV6)
 780                 return -ENOPROTOOPT;
 781
 782         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 783 #ifdef CONFIG_NETFILTER
 784         /* we need to exclude all possible ENOPROTOOPTs except default case */
 785         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 786             optname != IPV6_XFRM_POLICY) {
 787                 lock_sock(sk);
 788                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 789                                            optval, optlen);
 790                 release_sock(sk);
 791         }
 792 #endif
 793         return err;
 794 }
 795
 796 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 797 #endif
 798
 799 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 800                                   int optname, char __user *optval, int len)
 801 {
 802         struct ipv6_opt_hdr *hdr;
 803
 804         if (!opt)
 805                 return 0;
 806
 807         switch(optname) {
 808         case IPV6_HOPOPTS:
 809                 hdr = opt->hopopt;
 810                 break;
 811         case IPV6_RTHDRDSTOPTS:
 812                 hdr = opt->dst0opt;
 813                 break;
 814         case IPV6_RTHDR:
 815                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 816                 break;
 817         case IPV6_DSTOPTS:
 818                 hdr = opt->dst1opt;
 819                 break;
 820         default:
 821                 return -EINVAL; /* should not happen */
 822         }
 823
 824         if (!hdr)
 825                 return 0;
 826
 827         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 828         if (copy_to_user(optval, hdr, len));
 829                 return -EFAULT;
 830         return ipv6_optlen(hdr);
 831 }
 832
 833 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 834                     char __user *optval, int __user *optlen)
 835 {
 836         struct ipv6_pinfo *np = inet6_sk(sk);
 837         int len;
 838         int val;
 839
 840         if (get_user(len, optlen))
 841                 return -EFAULT;
 842         switch (optname) {
 843         case IPV6_ADDRFORM:
 844                 if (sk->sk_protocol != IPPROTO_UDP &&
 845                     sk->sk_protocol != IPPROTO_UDPLITE &&
 846                     sk->sk_protocol != IPPROTO_TCP)
 847                         return -EINVAL;
 848                 if (sk->sk_state != TCP_ESTABLISHED)
 849                         return -ENOTCONN;
 850                 val = sk->sk_family;
 851                 break;
 852         case MCAST_MSFILTER:
 853         {
 854                 struct group_filter gsf;
 855                 int err;
 856
 857                 if (len < GROUP_FILTER_SIZE(0))
 858                         return -EINVAL;
 859                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 860                         return -EFAULT;
 861                 lock_sock(sk);
 862                 err = ip6_mc_msfget(sk, &gsf,
 863                         (struct group_filter __user *)optval, optlen);
 864                 release_sock(sk);
 865                 return err;
 866         }
 867
 868         case IPV6_2292PKTOPTIONS:
 869         {
 870                 struct msghdr msg;
 871                 struct sk_buff *skb;
 872
 873                 if (sk->sk_type != SOCK_STREAM)
 874                         return -ENOPROTOOPT;
 875
 876                 msg.msg_control = optval;
 877                 msg.msg_controllen = len;
 878                 msg.msg_flags = 0;
 879
 880                 lock_sock(sk);
 881                 skb = np->pktoptions;
 882                 if (skb)
 883                         atomic_inc(&skb->users);
 884                 release_sock(sk);
 885
 886                 if (skb) {
 887                         int err = datagram_recv_ctl(sk, &msg, skb);
 888                         kfree_skb(skb);
 889                         if (err)
 890                                 return err;
 891                 } else {
 892                         if (np->rxopt.bits.rxinfo) {
 893                                 struct in6_pktinfo src_info;
 894                                 src_info.ipi6_ifindex = np->mcast_oif;
 895                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 896                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 897                         }
 898                         if (np->rxopt.bits.rxhlim) {
 899                                 int hlim = np->mcast_hops;
 900                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 901                         }
 902                         if (np->rxopt.bits.rxoinfo) {
 903                                 struct in6_pktinfo src_info;
 904                                 src_info.ipi6_ifindex = np->mcast_oif;
 905                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 906                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 907                         }
 908                         if (np->rxopt.bits.rxohlim) {
 909                                 int hlim = np->mcast_hops;
 910                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 911                         }
 912                 }
 913                 len -= msg.msg_controllen;
 914                 return put_user(len, optlen);
 915         }
 916         case IPV6_MTU:
 917         {
 918                 struct dst_entry *dst;
 919                 val = 0;
 920                 lock_sock(sk);
 921                 dst = sk_dst_get(sk);
 922                 if (dst) {
 923                         val = dst_mtu(dst);
 924                         dst_release(dst);
 925                 }
 926                 release_sock(sk);
 927                 if (!val)
 928                         return -ENOTCONN;
 929                 break;
 930         }
 931
 932         case IPV6_V6ONLY:
 933                 val = np->ipv6only;
 934                 break;
 935
 936         case IPV6_RECVPKTINFO:
 937                 val = np->rxopt.bits.rxinfo;
 938                 break;
 939
 940         case IPV6_2292PKTINFO:
 941                 val = np->rxopt.bits.rxoinfo;
 942                 break;
 943
 944         case IPV6_RECVHOPLIMIT:
 945                 val = np->rxopt.bits.rxhlim;
 946                 break;
 947
 948         case IPV6_2292HOPLIMIT:
 949                 val = np->rxopt.bits.rxohlim;
 950                 break;
 951
 952         case IPV6_RECVRTHDR:
 953                 val = np->rxopt.bits.srcrt;
 954                 break;
 955
 956         case IPV6_2292RTHDR:
 957                 val = np->rxopt.bits.osrcrt;
 958                 break;
 959
 960         case IPV6_HOPOPTS:
 961         case IPV6_RTHDRDSTOPTS:
 962         case IPV6_RTHDR:
 963         case IPV6_DSTOPTS:
 964         {
 965
 966                 lock_sock(sk);
 967                 len = ipv6_getsockopt_sticky(sk, np->opt,
 968                                              optname, optval, len);
 969                 release_sock(sk);
 970                 return put_user(len, optlen);
 971         }
 972
 973         case IPV6_RECVHOPOPTS:
 974                 val = np->rxopt.bits.hopopts;
 975                 break;
 976
 977         case IPV6_2292HOPOPTS:
 978                 val = np->rxopt.bits.ohopopts;
 979                 break;
 980
 981         case IPV6_RECVDSTOPTS:
 982                 val = np->rxopt.bits.dstopts;
 983                 break;
 984
 985         case IPV6_2292DSTOPTS:
 986                 val = np->rxopt.bits.odstopts;
 987                 break;
 988
 989         case IPV6_TCLASS:
 990                 val = np->tclass;
 991                 if (val < 0)
 992                         val = 0;
 993                 break;
 994
 995         case IPV6_RECVTCLASS:
 996                 val = np->rxopt.bits.rxtclass;
 997                 break;
 998
 999         case IPV6_FLOWINFO:
1000                 val = np->rxopt.bits.rxflow;
1001                 break;
1002
1003         case IPV6_UNICAST_HOPS:
1004         case IPV6_MULTICAST_HOPS:
1005         {
1006                 struct dst_entry *dst;
1007
1008                 if (optname == IPV6_UNICAST_HOPS)
1009                         val = np->hop_limit;
1010                 else
1011                         val = np->mcast_hops;
1012
1013                 dst = sk_dst_get(sk);
1014                 if (dst) {
1015                         if (val < 0)
1016                                 val = dst_metric(dst, RTAX_HOPLIMIT);
1017                         if (val < 0)
1018                                 val = ipv6_get_hoplimit(dst->dev);
1019                         dst_release(dst);
1020                 }
1021                 if (val < 0)
1022                         val = ipv6_devconf.hop_limit;
1023                 break;
1024         }
1025
1026         case IPV6_MULTICAST_LOOP:
1027                 val = np->mc_loop;
1028                 break;
1029
1030         case IPV6_MULTICAST_IF:
1031                 val = np->mcast_oif;
1032                 break;
1033
1034         case IPV6_MTU_DISCOVER:
1035                 val = np->pmtudisc;
1036                 break;
1037
1038         case IPV6_RECVERR:
1039                 val = np->recverr;
1040                 break;
1041
1042         case IPV6_FLOWINFO_SEND:
1043                 val = np->sndflow;
1044                 break;
1045
1046         default:
1047                 return -EINVAL;
1048         }
1049         len = min_t(unsigned int, sizeof(int), len);
1050         if(put_user(len, optlen))
1051                 return -EFAULT;
1052         if(copy_to_user(optval,&val,len))
1053                 return -EFAULT;
1054         return 0;
1055 }
1056
1057 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1058                     char __user *optval, int __user *optlen)
1059 {
1060         int err;
1061
1062         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1063                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1064
1065         if(level != SOL_IPV6)
1066                 return -ENOPROTOOPT;
1067
1068         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1069 #ifdef CONFIG_NETFILTER
1070         /* we need to exclude all possible EINVALs except default case */
1071         if (err == -EINVAL && optname != IPV6_ADDRFORM &&
1072                         optname != MCAST_MSFILTER) {
1073                 int len;
1074
1075                 if (get_user(len, optlen))
1076                         return -EFAULT;
1077
1078                 lock_sock(sk);
1079                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1080                                 &len);
1081                 release_sock(sk);
1082                 if (err >= 0)
1083                         err = put_user(len, optlen);
1084         }
1085 #endif
1086         return err;
1087 }
1088
1089 EXPORT_SYMBOL(ipv6_getsockopt);
1090
1091 #ifdef CONFIG_COMPAT
1092 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1093                            char __user *optval, int __user *optlen)
1094 {
1095         int err;
1096
1097         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1098                 if (udp_prot.compat_getsockopt != NULL)
1099                         return udp_prot.compat_getsockopt(sk, level, optname,
1100                                                           optval, optlen);
1101                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1102         }
1103
1104         if (level != SOL_IPV6)
1105                 return -ENOPROTOOPT;
1106
1107         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1108 #ifdef CONFIG_NETFILTER
1109         /* we need to exclude all possible EINVALs except default case */
1110         if (err == -EINVAL && optname != IPV6_ADDRFORM &&
1111                         optname != MCAST_MSFILTER) {
1112                 int len;
1113
1114                 if (get_user(len, optlen))
1115                         return -EFAULT;
1116
1117                 lock_sock(sk);
1118                 err = compat_nf_getsockopt(sk, PF_INET6,
1119                                            optname, optval, &len);
1120                 release_sock(sk);
1121                 if (err >= 0)
1122                         err = put_user(len, optlen);
1123         }
1124 #endif
1125         return err;
1126 }
1127
1128 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1129 #endif
1130
1131 void __init ipv6_packet_init(void)
1132 {
1133         dev_add_pack(&ipv6_packet_type);
1134 }
1135
1136 void ipv6_packet_cleanup(void)
1137 {
1138         dev_remove_pack(&ipv6_packet_type);
1139 }