net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  *      FIXME: Make the setsockopt code POSIX compliant: That is
  18  *
  19  *      o       Truncate getsockopt returns
  20  *      o       Return an optlen of the truncated length if need be
  21  *
  22  *      Changes:
  23  *      David L Stevens <dlstevens@us.ibm.com>:
  24  *              - added multicast source filtering API for MLDv2
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/capability.h>
  29 #include <linux/errno.h>
  30 #include <linux/types.h>
  31 #include <linux/socket.h>
  32 #include <linux/sockios.h>
  33 #include <linux/net.h>
  34 #include <linux/in6.h>
  35 #include <linux/mroute6.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/if_arp.h>
  38 #include <linux/init.h>
  39 #include <linux/sysctl.h>
  40 #include <linux/netfilter.h>
  41
  42 #include <net/sock.h>
  43 #include <net/snmp.h>
  44 #include <net/ipv6.h>
  45 #include <net/ndisc.h>
  46 #include <net/protocol.h>
  47 #include <net/transp_v6.h>
  48 #include <net/ip6_route.h>
  49 #include <net/addrconf.h>
  50 #include <net/inet_common.h>
  51 #include <net/tcp.h>
  52 #include <net/udp.h>
  53 #include <net/udplite.h>
  54 #include <net/xfrm.h>
  55 #include <net/compat.h>
  56
  57 #include <asm/uaccess.h>
  58
  59 DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  60
  61 struct ip6_ra_chain *ip6_ra_chain;
  62 DEFINE_RWLOCK(ip6_ra_lock);
  63
  64 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
  65 {
  66         struct ip6_ra_chain *ra, *new_ra, **rap;
  67
  68         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  69         if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
  70                 return -EINVAL;
  71
  72         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  73
  74         write_lock_bh(&ip6_ra_lock);
  75         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  76                 if (ra->sk == sk) {
  77                         if (sel>=0) {
  78                                 write_unlock_bh(&ip6_ra_lock);
  79                                 kfree(new_ra);
  80                                 return -EADDRINUSE;
  81                         }
  82
  83                         *rap = ra->next;
  84                         write_unlock_bh(&ip6_ra_lock);
  85
  86                         if (ra->destructor)
  87                                 ra->destructor(sk);
  88                         sock_put(sk);
  89                         kfree(ra);
  90                         return 0;
  91                 }
  92         }
  93         if (new_ra == NULL) {
  94                 write_unlock_bh(&ip6_ra_lock);
  95                 return -ENOBUFS;
  96         }
  97         new_ra->sk = sk;
  98         new_ra->sel = sel;
  99         new_ra->destructor = destructor;
 100         new_ra->next = ra;
 101         *rap = new_ra;
 102         sock_hold(sk);
 103         write_unlock_bh(&ip6_ra_lock);
 104         return 0;
 105 }
 106
 107 static
 108 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 109                                            struct ipv6_txoptions *opt)
 110 {
 111         if (inet_sk(sk)->is_icsk) {
 112                 if (opt &&
 113                     !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 114                     inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 115                         struct inet_connection_sock *icsk = inet_csk(sk);
 116                         icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 117                         icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 118                 }
 119                 opt = xchg(&inet6_sk(sk)->opt, opt);
 120         } else {
 121                 write_lock(&sk->sk_dst_lock);
 122                 opt = xchg(&inet6_sk(sk)->opt, opt);
 123                 write_unlock(&sk->sk_dst_lock);
 124         }
 125         sk_dst_reset(sk);
 126
 127         return opt;
 128 }
 129
 130 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 131                     char __user *optval, int optlen)
 132 {
 133         struct ipv6_pinfo *np = inet6_sk(sk);
 134         struct net *net = sock_net(sk);
 135         int val, valbool;
 136         int retv = -ENOPROTOOPT;
 137
 138         if (optval == NULL)
 139                 val=0;
 140         else {
 141                 if (optlen >= sizeof(int)) {
 142                         if (get_user(val, (int __user *) optval))
 143                                 return -EFAULT;
 144                 } else
 145                         val = 0;
 146         }
 147
 148         valbool = (val!=0);
 149
 150         if (ip6_mroute_opt(optname))
 151                 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 152
 153         lock_sock(sk);
 154
 155         switch (optname) {
 156
 157         case IPV6_ADDRFORM:
 158                 if (optlen < sizeof(int))
 159                         goto e_inval;
 160                 if (val == PF_INET) {
 161                         struct ipv6_txoptions *opt;
 162                         struct sk_buff *pktopt;
 163
 164                         if (sk->sk_type == SOCK_RAW)
 165                                 break;
 166
 167                         if (sk->sk_protocol == IPPROTO_UDP ||
 168                             sk->sk_protocol == IPPROTO_UDPLITE) {
 169                                 struct udp_sock *up = udp_sk(sk);
 170                                 if (up->pending == AF_INET6) {
 171                                         retv = -EBUSY;
 172                                         break;
 173                                 }
 174                         } else if (sk->sk_protocol != IPPROTO_TCP)
 175                                 break;
 176
 177                         if (sk->sk_state != TCP_ESTABLISHED) {
 178                                 retv = -ENOTCONN;
 179                                 break;
 180                         }
 181
 182                         if (ipv6_only_sock(sk) ||
 183                             !ipv6_addr_v4mapped(&np->daddr)) {
 184                                 retv = -EADDRNOTAVAIL;
 185                                 break;
 186                         }
 187
 188                         fl6_free_socklist(sk);
 189                         ipv6_sock_mc_close(sk);
 190
 191                         /*
 192                          * Sock is moving from IPv6 to IPv4 (sk_prot), so
 193                          * remove it from the refcnt debug socks count in the
 194                          * original family...
 195                          */
 196                         sk_refcnt_debug_dec(sk);
 197
 198                         if (sk->sk_protocol == IPPROTO_TCP) {
 199                                 struct inet_connection_sock *icsk = inet_csk(sk);
 200                                 local_bh_disable();
 201                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 202                                 sock_prot_inuse_add(net, &tcp_prot, 1);
 203                                 local_bh_enable();
 204                                 sk->sk_prot = &tcp_prot;
 205                                 icsk->icsk_af_ops = &ipv4_specific;
 206                                 sk->sk_socket->ops = &inet_stream_ops;
 207                                 sk->sk_family = PF_INET;
 208                                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 209                         } else {
 210                                 struct proto *prot = &udp_prot;
 211
 212                                 if (sk->sk_protocol == IPPROTO_UDPLITE)
 213                                         prot = &udplite_prot;
 214                                 local_bh_disable();
 215                                 sock_prot_inuse_add(net, sk->sk_prot, -1);
 216                                 sock_prot_inuse_add(net, prot, 1);
 217                                 local_bh_enable();
 218                                 sk->sk_prot = prot;
 219                                 sk->sk_socket->ops = &inet_dgram_ops;
 220                                 sk->sk_family = PF_INET;
 221                         }
 222                         opt = xchg(&np->opt, NULL);
 223                         if (opt)
 224                                 sock_kfree_s(sk, opt, opt->tot_len);
 225                         pktopt = xchg(&np->pktoptions, NULL);
 226                         if (pktopt)
 227                                 kfree_skb(pktopt);
 228
 229                         sk->sk_destruct = inet_sock_destruct;
 230                         /*
 231                          * ... and add it to the refcnt debug socks count
 232                          * in the new family. -acme
 233                          */
 234                         sk_refcnt_debug_inc(sk);
 235                         module_put(THIS_MODULE);
 236                         retv = 0;
 237                         break;
 238                 }
 239                 goto e_inval;
 240
 241         case IPV6_V6ONLY:
 242                 if (optlen < sizeof(int) ||
 243                     inet_sk(sk)->num)
 244                         goto e_inval;
 245                 np->ipv6only = valbool;
 246                 retv = 0;
 247                 break;
 248
 249         case IPV6_RECVPKTINFO:
 250                 if (optlen < sizeof(int))
 251                         goto e_inval;
 252                 np->rxopt.bits.rxinfo = valbool;
 253                 retv = 0;
 254                 break;
 255
 256         case IPV6_2292PKTINFO:
 257                 if (optlen < sizeof(int))
 258                         goto e_inval;
 259                 np->rxopt.bits.rxoinfo = valbool;
 260                 retv = 0;
 261                 break;
 262
 263         case IPV6_RECVHOPLIMIT:
 264                 if (optlen < sizeof(int))
 265                         goto e_inval;
 266                 np->rxopt.bits.rxhlim = valbool;
 267                 retv = 0;
 268                 break;
 269
 270         case IPV6_2292HOPLIMIT:
 271                 if (optlen < sizeof(int))
 272                         goto e_inval;
 273                 np->rxopt.bits.rxohlim = valbool;
 274                 retv = 0;
 275                 break;
 276
 277         case IPV6_RECVRTHDR:
 278                 if (optlen < sizeof(int))
 279                         goto e_inval;
 280                 np->rxopt.bits.srcrt = valbool;
 281                 retv = 0;
 282                 break;
 283
 284         case IPV6_2292RTHDR:
 285                 if (optlen < sizeof(int))
 286                         goto e_inval;
 287                 np->rxopt.bits.osrcrt = valbool;
 288                 retv = 0;
 289                 break;
 290
 291         case IPV6_RECVHOPOPTS:
 292                 if (optlen < sizeof(int))
 293                         goto e_inval;
 294                 np->rxopt.bits.hopopts = valbool;
 295                 retv = 0;
 296                 break;
 297
 298         case IPV6_2292HOPOPTS:
 299                 if (optlen < sizeof(int))
 300                         goto e_inval;
 301                 np->rxopt.bits.ohopopts = valbool;
 302                 retv = 0;
 303                 break;
 304
 305         case IPV6_RECVDSTOPTS:
 306                 if (optlen < sizeof(int))
 307                         goto e_inval;
 308                 np->rxopt.bits.dstopts = valbool;
 309                 retv = 0;
 310                 break;
 311
 312         case IPV6_2292DSTOPTS:
 313                 if (optlen < sizeof(int))
 314                         goto e_inval;
 315                 np->rxopt.bits.odstopts = valbool;
 316                 retv = 0;
 317                 break;
 318
 319         case IPV6_TCLASS:
 320                 if (optlen < sizeof(int))
 321                         goto e_inval;
 322                 if (val < -1 || val > 0xff)
 323                         goto e_inval;
 324                 np->tclass = val;
 325                 retv = 0;
 326                 break;
 327
 328         case IPV6_RECVTCLASS:
 329                 if (optlen < sizeof(int))
 330                         goto e_inval;
 331                 np->rxopt.bits.rxtclass = valbool;
 332                 retv = 0;
 333                 break;
 334
 335         case IPV6_FLOWINFO:
 336                 if (optlen < sizeof(int))
 337                         goto e_inval;
 338                 np->rxopt.bits.rxflow = valbool;
 339                 retv = 0;
 340                 break;
 341
 342         case IPV6_HOPOPTS:
 343         case IPV6_RTHDRDSTOPTS:
 344         case IPV6_RTHDR:
 345         case IPV6_DSTOPTS:
 346         {
 347                 struct ipv6_txoptions *opt;
 348                 if (optlen == 0)
 349                         optval = NULL;
 350
 351                 /* hop-by-hop / destination options are privileged option */
 352                 retv = -EPERM;
 353                 if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 354                         break;
 355
 356                 if (optlen < sizeof(struct ipv6_opt_hdr) ||
 357                     optlen & 0x7 || optlen > 8 * 255)
 358                         goto e_inval;
 359
 360                 opt = ipv6_renew_options(sk, np->opt, optname,
 361                                          (struct ipv6_opt_hdr __user *)optval,
 362                                          optlen);
 363                 if (IS_ERR(opt)) {
 364                         retv = PTR_ERR(opt);
 365                         break;
 366                 }
 367
 368                 /* routing header option needs extra check */
 369                 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 370                         struct ipv6_rt_hdr *rthdr = opt->srcrt;
 371                         switch (rthdr->type) {
 372 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 373                         case IPV6_SRCRT_TYPE_2:
 374                                 break;
 375 #endif
 376                         default:
 377                                 goto sticky_done;
 378                         }
 379
 380                         if ((rthdr->hdrlen & 1) ||
 381                             (rthdr->hdrlen >> 1) != rthdr->segments_left)
 382                                 goto sticky_done;
 383                 }
 384
 385                 retv = 0;
 386                 opt = ipv6_update_options(sk, opt);
 387 sticky_done:
 388                 if (opt)
 389                         sock_kfree_s(sk, opt, opt->tot_len);
 390                 break;
 391         }
 392
 393         case IPV6_2292PKTOPTIONS:
 394         {
 395                 struct ipv6_txoptions *opt = NULL;
 396                 struct msghdr msg;
 397                 struct flowi fl;
 398                 int junk;
 399
 400                 fl.fl6_flowlabel = 0;
 401                 fl.oif = sk->sk_bound_dev_if;
 402
 403                 if (optlen == 0)
 404                         goto update;
 405
 406                 /* 1K is probably excessive
 407                  * 1K is surely not enough, 2K per standard header is 16K.
 408                  */
 409                 retv = -EINVAL;
 410                 if (optlen > 64*1024)
 411                         break;
 412
 413                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 414                 retv = -ENOBUFS;
 415                 if (opt == NULL)
 416                         break;
 417
 418                 memset(opt, 0, sizeof(*opt));
 419                 opt->tot_len = sizeof(*opt) + optlen;
 420                 retv = -EFAULT;
 421                 if (copy_from_user(opt+1, optval, optlen))
 422                         goto done;
 423
 424                 msg.msg_controllen = optlen;
 425                 msg.msg_control = (void*)(opt+1);
 426
 427                 retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
 428                 if (retv)
 429                         goto done;
 430 update:
 431                 retv = 0;
 432                 opt = ipv6_update_options(sk, opt);
 433 done:
 434                 if (opt)
 435                         sock_kfree_s(sk, opt, opt->tot_len);
 436                 break;
 437         }
 438         case IPV6_UNICAST_HOPS:
 439                 if (optlen < sizeof(int))
 440                         goto e_inval;
 441                 if (val > 255 || val < -1)
 442                         goto e_inval;
 443                 np->hop_limit = val;
 444                 retv = 0;
 445                 break;
 446
 447         case IPV6_MULTICAST_HOPS:
 448                 if (sk->sk_type == SOCK_STREAM)
 449                         goto e_inval;
 450                 if (optlen < sizeof(int))
 451                         goto e_inval;
 452                 if (val > 255 || val < -1)
 453                         goto e_inval;
 454                 np->mcast_hops = val;
 455                 retv = 0;
 456                 break;
 457
 458         case IPV6_MULTICAST_LOOP:
 459                 if (optlen < sizeof(int))
 460                         goto e_inval;
 461                 np->mc_loop = valbool;
 462                 retv = 0;
 463                 break;
 464
 465         case IPV6_MULTICAST_IF:
 466                 if (sk->sk_type == SOCK_STREAM)
 467                         goto e_inval;
 468                 if (optlen < sizeof(int))
 469                         goto e_inval;
 470
 471                 if (val) {
 472                         if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 473                                 goto e_inval;
 474
 475                         if (__dev_get_by_index(net, val) == NULL) {
 476                                 retv = -ENODEV;
 477                                 break;
 478                         }
 479                 }
 480                 np->mcast_oif = val;
 481                 retv = 0;
 482                 break;
 483         case IPV6_ADD_MEMBERSHIP:
 484         case IPV6_DROP_MEMBERSHIP:
 485         {
 486                 struct ipv6_mreq mreq;
 487
 488                 if (optlen < sizeof(struct ipv6_mreq))
 489                         goto e_inval;
 490
 491                 retv = -EPROTO;
 492                 if (inet_sk(sk)->is_icsk)
 493                         break;
 494
 495                 retv = -EFAULT;
 496                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 497                         break;
 498
 499                 if (optname == IPV6_ADD_MEMBERSHIP)
 500                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 501                 else
 502                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 503                 break;
 504         }
 505         case IPV6_JOIN_ANYCAST:
 506         case IPV6_LEAVE_ANYCAST:
 507         {
 508                 struct ipv6_mreq mreq;
 509
 510                 if (optlen < sizeof(struct ipv6_mreq))
 511                         goto e_inval;
 512
 513                 retv = -EFAULT;
 514                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 515                         break;
 516
 517                 if (optname == IPV6_JOIN_ANYCAST)
 518                         retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 519                 else
 520                         retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 521                 break;
 522         }
 523         case MCAST_JOIN_GROUP:
 524         case MCAST_LEAVE_GROUP:
 525         {
 526                 struct group_req greq;
 527                 struct sockaddr_in6 *psin6;
 528
 529                 if (optlen < sizeof(struct group_req))
 530                         goto e_inval;
 531
 532                 retv = -EFAULT;
 533                 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 534                         break;
 535                 if (greq.gr_group.ss_family != AF_INET6) {
 536                         retv = -EADDRNOTAVAIL;
 537                         break;
 538                 }
 539                 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 540                 if (optname == MCAST_JOIN_GROUP)
 541                         retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 542                                 &psin6->sin6_addr);
 543                 else
 544                         retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 545                                 &psin6->sin6_addr);
 546                 break;
 547         }
 548         case MCAST_JOIN_SOURCE_GROUP:
 549         case MCAST_LEAVE_SOURCE_GROUP:
 550         case MCAST_BLOCK_SOURCE:
 551         case MCAST_UNBLOCK_SOURCE:
 552         {
 553                 struct group_source_req greqs;
 554                 int omode, add;
 555
 556                 if (optlen < sizeof(struct group_source_req))
 557                         goto e_inval;
 558                 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 559                         retv = -EFAULT;
 560                         break;
 561                 }
 562                 if (greqs.gsr_group.ss_family != AF_INET6 ||
 563                     greqs.gsr_source.ss_family != AF_INET6) {
 564                         retv = -EADDRNOTAVAIL;
 565                         break;
 566                 }
 567                 if (optname == MCAST_BLOCK_SOURCE) {
 568                         omode = MCAST_EXCLUDE;
 569                         add = 1;
 570                 } else if (optname == MCAST_UNBLOCK_SOURCE) {
 571                         omode = MCAST_EXCLUDE;
 572                         add = 0;
 573                 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 574                         struct sockaddr_in6 *psin6;
 575
 576                         psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 577                         retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 578                                 &psin6->sin6_addr);
 579                         /* prior join w/ different source is ok */
 580                         if (retv && retv != -EADDRINUSE)
 581                                 break;
 582                         omode = MCAST_INCLUDE;
 583                         add = 1;
 584                 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 585                         omode = MCAST_INCLUDE;
 586                         add = 0;
 587                 }
 588                 retv = ip6_mc_source(add, omode, sk, &greqs);
 589                 break;
 590         }
 591         case MCAST_MSFILTER:
 592         {
 593                 extern int sysctl_mld_max_msf;
 594                 struct group_filter *gsf;
 595
 596                 if (optlen < GROUP_FILTER_SIZE(0))
 597                         goto e_inval;
 598                 if (optlen > sysctl_optmem_max) {
 599                         retv = -ENOBUFS;
 600                         break;
 601                 }
 602                 gsf = kmalloc(optlen,GFP_KERNEL);
 603                 if (!gsf) {
 604                         retv = -ENOBUFS;
 605                         break;
 606                 }
 607                 retv = -EFAULT;
 608                 if (copy_from_user(gsf, optval, optlen)) {
 609                         kfree(gsf);
 610                         break;
 611                 }
 612                 /* numsrc >= (4G-140)/128 overflow in 32 bits */
 613                 if (gsf->gf_numsrc >= 0x1ffffffU ||
 614                     gsf->gf_numsrc > sysctl_mld_max_msf) {
 615                         kfree(gsf);
 616                         retv = -ENOBUFS;
 617                         break;
 618                 }
 619                 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 620                         kfree(gsf);
 621                         retv = -EINVAL;
 622                         break;
 623                 }
 624                 retv = ip6_mc_msfilter(sk, gsf);
 625                 kfree(gsf);
 626
 627                 break;
 628         }
 629         case IPV6_ROUTER_ALERT:
 630                 if (optlen < sizeof(int))
 631                         goto e_inval;
 632                 retv = ip6_ra_control(sk, val, NULL);
 633                 break;
 634         case IPV6_MTU_DISCOVER:
 635                 if (optlen < sizeof(int))
 636                         goto e_inval;
 637                 if (val<0 || val>3)
 638                         goto e_inval;
 639                 np->pmtudisc = val;
 640                 retv = 0;
 641                 break;
 642         case IPV6_MTU:
 643                 if (optlen < sizeof(int))
 644                         goto e_inval;
 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                 if (optlen < sizeof(int))
 652                         goto e_inval;
 653                 np->recverr = valbool;
 654                 if (!val)
 655                         skb_queue_purge(&sk->sk_error_queue);
 656                 retv = 0;
 657                 break;
 658         case IPV6_FLOWINFO_SEND:
 659                 if (optlen < sizeof(int))
 660                         goto e_inval;
 661                 np->sndflow = valbool;
 662                 retv = 0;
 663                 break;
 664         case IPV6_FLOWLABEL_MGR:
 665                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 666                 break;
 667         case IPV6_IPSEC_POLICY:
 668         case IPV6_XFRM_POLICY:
 669                 retv = -EPERM;
 670                 if (!capable(CAP_NET_ADMIN))
 671                         break;
 672                 retv = xfrm_user_policy(sk, optname, optval, optlen);
 673                 break;
 674
 675         case IPV6_ADDR_PREFERENCES:
 676             {
 677                 unsigned int pref = 0;
 678                 unsigned int prefmask = ~0;
 679
 680                 if (optlen < sizeof(int))
 681                         goto e_inval;
 682
 683                 retv = -EINVAL;
 684
 685                 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 686                 switch (val & (IPV6_PREFER_SRC_PUBLIC|
 687                                IPV6_PREFER_SRC_TMP|
 688                                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 689                 case IPV6_PREFER_SRC_PUBLIC:
 690                         pref |= IPV6_PREFER_SRC_PUBLIC;
 691                         break;
 692                 case IPV6_PREFER_SRC_TMP:
 693                         pref |= IPV6_PREFER_SRC_TMP;
 694                         break;
 695                 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 696                         break;
 697                 case 0:
 698                         goto pref_skip_pubtmp;
 699                 default:
 700                         goto e_inval;
 701                 }
 702
 703                 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 704                               IPV6_PREFER_SRC_TMP);
 705 pref_skip_pubtmp:
 706
 707                 /* check HOME/COA conflicts */
 708                 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 709                 case IPV6_PREFER_SRC_HOME:
 710                         break;
 711                 case IPV6_PREFER_SRC_COA:
 712                         pref |= IPV6_PREFER_SRC_COA;
 713                 case 0:
 714                         goto pref_skip_coa;
 715                 default:
 716                         goto e_inval;
 717                 }
 718
 719                 prefmask &= ~IPV6_PREFER_SRC_COA;
 720 pref_skip_coa:
 721
 722                 /* check CGA/NONCGA conflicts */
 723                 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 724                 case IPV6_PREFER_SRC_CGA:
 725                 case IPV6_PREFER_SRC_NONCGA:
 726                 case 0:
 727                         break;
 728                 default:
 729                         goto e_inval;
 730                 }
 731
 732                 np->srcprefs = (np->srcprefs & prefmask) | pref;
 733                 retv = 0;
 734
 735                 break;
 736             }
 737         }
 738
 739         release_sock(sk);
 740
 741         return retv;
 742
 743 e_inval:
 744         release_sock(sk);
 745         return -EINVAL;
 746 }
 747
 748 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 749                     char __user *optval, int optlen)
 750 {
 751         int err;
 752
 753         if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 754                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 755
 756         if (level != SOL_IPV6)
 757                 return -ENOPROTOOPT;
 758
 759         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 760 #ifdef CONFIG_NETFILTER
 761         /* we need to exclude all possible ENOPROTOOPTs except default case */
 762         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 763                         optname != IPV6_XFRM_POLICY) {
 764                 lock_sock(sk);
 765                 err = nf_setsockopt(sk, PF_INET6, optname, optval,
 766                                 optlen);
 767                 release_sock(sk);
 768         }
 769 #endif
 770         return err;
 771 }
 772
 773 EXPORT_SYMBOL(ipv6_setsockopt);
 774
 775 #ifdef CONFIG_COMPAT
 776 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 777                            char __user *optval, int optlen)
 778 {
 779         int err;
 780
 781         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 782                 if (udp_prot.compat_setsockopt != NULL)
 783                         return udp_prot.compat_setsockopt(sk, level, optname,
 784                                                           optval, optlen);
 785                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 786         }
 787
 788         if (level != SOL_IPV6)
 789                 return -ENOPROTOOPT;
 790
 791         if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 792                 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 793                         ipv6_setsockopt);
 794
 795         err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 796 #ifdef CONFIG_NETFILTER
 797         /* we need to exclude all possible ENOPROTOOPTs except default case */
 798         if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 799             optname != IPV6_XFRM_POLICY) {
 800                 lock_sock(sk);
 801                 err = compat_nf_setsockopt(sk, PF_INET6, optname,
 802                                            optval, optlen);
 803                 release_sock(sk);
 804         }
 805 #endif
 806         return err;
 807 }
 808
 809 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 810 #endif
 811
 812 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 813                                   int optname, char __user *optval, int len)
 814 {
 815         struct ipv6_opt_hdr *hdr;
 816
 817         if (!opt)
 818                 return 0;
 819
 820         switch(optname) {
 821         case IPV6_HOPOPTS:
 822                 hdr = opt->hopopt;
 823                 break;
 824         case IPV6_RTHDRDSTOPTS:
 825                 hdr = opt->dst0opt;
 826                 break;
 827         case IPV6_RTHDR:
 828                 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 829                 break;
 830         case IPV6_DSTOPTS:
 831                 hdr = opt->dst1opt;
 832                 break;
 833         default:
 834                 return -EINVAL; /* should not happen */
 835         }
 836
 837         if (!hdr)
 838                 return 0;
 839
 840         len = min_t(unsigned int, len, ipv6_optlen(hdr));
 841         if (copy_to_user(optval, hdr, len))
 842                 return -EFAULT;
 843         return len;
 844 }
 845
 846 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 847                     char __user *optval, int __user *optlen)
 848 {
 849         struct ipv6_pinfo *np = inet6_sk(sk);
 850         int len;
 851         int val;
 852
 853         if (ip6_mroute_opt(optname))
 854                 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 855
 856         if (get_user(len, optlen))
 857                 return -EFAULT;
 858         switch (optname) {
 859         case IPV6_ADDRFORM:
 860                 if (sk->sk_protocol != IPPROTO_UDP &&
 861                     sk->sk_protocol != IPPROTO_UDPLITE &&
 862                     sk->sk_protocol != IPPROTO_TCP)
 863                         return -EINVAL;
 864                 if (sk->sk_state != TCP_ESTABLISHED)
 865                         return -ENOTCONN;
 866                 val = sk->sk_family;
 867                 break;
 868         case MCAST_MSFILTER:
 869         {
 870                 struct group_filter gsf;
 871                 int err;
 872
 873                 if (len < GROUP_FILTER_SIZE(0))
 874                         return -EINVAL;
 875                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 876                         return -EFAULT;
 877                 lock_sock(sk);
 878                 err = ip6_mc_msfget(sk, &gsf,
 879                         (struct group_filter __user *)optval, optlen);
 880                 release_sock(sk);
 881                 return err;
 882         }
 883
 884         case IPV6_2292PKTOPTIONS:
 885         {
 886                 struct msghdr msg;
 887                 struct sk_buff *skb;
 888
 889                 if (sk->sk_type != SOCK_STREAM)
 890                         return -ENOPROTOOPT;
 891
 892                 msg.msg_control = optval;
 893                 msg.msg_controllen = len;
 894                 msg.msg_flags = 0;
 895
 896                 lock_sock(sk);
 897                 skb = np->pktoptions;
 898                 if (skb)
 899                         atomic_inc(&skb->users);
 900                 release_sock(sk);
 901
 902                 if (skb) {
 903                         int err = datagram_recv_ctl(sk, &msg, skb);
 904                         kfree_skb(skb);
 905                         if (err)
 906                                 return err;
 907                 } else {
 908                         if (np->rxopt.bits.rxinfo) {
 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_PKTINFO, sizeof(src_info), &src_info);
 913                         }
 914                         if (np->rxopt.bits.rxhlim) {
 915                                 int hlim = np->mcast_hops;
 916                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 917                         }
 918                         if (np->rxopt.bits.rxoinfo) {
 919                                 struct in6_pktinfo src_info;
 920                                 src_info.ipi6_ifindex = np->mcast_oif;
 921                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 922                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 923                         }
 924                         if (np->rxopt.bits.rxohlim) {
 925                                 int hlim = np->mcast_hops;
 926                                 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 927                         }
 928                 }
 929                 len -= msg.msg_controllen;
 930                 return put_user(len, optlen);
 931         }
 932         case IPV6_MTU:
 933         {
 934                 struct dst_entry *dst;
 935                 val = 0;
 936                 lock_sock(sk);
 937                 dst = sk_dst_get(sk);
 938                 if (dst) {
 939                         val = dst_mtu(dst);
 940                         dst_release(dst);
 941                 }
 942                 release_sock(sk);
 943                 if (!val)
 944                         return -ENOTCONN;
 945                 break;
 946         }
 947
 948         case IPV6_V6ONLY:
 949                 val = np->ipv6only;
 950                 break;
 951
 952         case IPV6_RECVPKTINFO:
 953                 val = np->rxopt.bits.rxinfo;
 954                 break;
 955
 956         case IPV6_2292PKTINFO:
 957                 val = np->rxopt.bits.rxoinfo;
 958                 break;
 959
 960         case IPV6_RECVHOPLIMIT:
 961                 val = np->rxopt.bits.rxhlim;
 962                 break;
 963
 964         case IPV6_2292HOPLIMIT:
 965                 val = np->rxopt.bits.rxohlim;
 966                 break;
 967
 968         case IPV6_RECVRTHDR:
 969                 val = np->rxopt.bits.srcrt;
 970                 break;
 971
 972         case IPV6_2292RTHDR:
 973                 val = np->rxopt.bits.osrcrt;
 974                 break;
 975
 976         case IPV6_HOPOPTS:
 977         case IPV6_RTHDRDSTOPTS:
 978         case IPV6_RTHDR:
 979         case IPV6_DSTOPTS:
 980         {
 981
 982                 lock_sock(sk);
 983                 len = ipv6_getsockopt_sticky(sk, np->opt,
 984                                              optname, optval, len);
 985                 release_sock(sk);
 986                 /* check if ipv6_getsockopt_sticky() returns err code */
 987                 if (len < 0)
 988                         return len;
 989                 return put_user(len, optlen);
 990         }
 991
 992         case IPV6_RECVHOPOPTS:
 993                 val = np->rxopt.bits.hopopts;
 994                 break;
 995
 996         case IPV6_2292HOPOPTS:
 997                 val = np->rxopt.bits.ohopopts;
 998                 break;
 999
1000         case IPV6_RECVDSTOPTS:
1001                 val = np->rxopt.bits.dstopts;
1002                 break;
1003
1004         case IPV6_2292DSTOPTS:
1005                 val = np->rxopt.bits.odstopts;
1006                 break;
1007
1008         case IPV6_TCLASS:
1009                 val = np->tclass;
1010                 if (val < 0)
1011                         val = 0;
1012                 break;
1013
1014         case IPV6_RECVTCLASS:
1015                 val = np->rxopt.bits.rxtclass;
1016                 break;
1017
1018         case IPV6_FLOWINFO:
1019                 val = np->rxopt.bits.rxflow;
1020                 break;
1021
1022         case IPV6_UNICAST_HOPS:
1023         case IPV6_MULTICAST_HOPS:
1024         {
1025                 struct dst_entry *dst;
1026
1027                 if (optname == IPV6_UNICAST_HOPS)
1028                         val = np->hop_limit;
1029                 else
1030                         val = np->mcast_hops;
1031
1032                 dst = sk_dst_get(sk);
1033                 if (dst) {
1034                         if (val < 0)
1035                                 val = ip6_dst_hoplimit(dst);
1036                         dst_release(dst);
1037                 }
1038                 if (val < 0)
1039                         val = ipv6_devconf.hop_limit;
1040                 break;
1041         }
1042
1043         case IPV6_MULTICAST_LOOP:
1044                 val = np->mc_loop;
1045                 break;
1046
1047         case IPV6_MULTICAST_IF:
1048                 val = np->mcast_oif;
1049                 break;
1050
1051         case IPV6_MTU_DISCOVER:
1052                 val = np->pmtudisc;
1053                 break;
1054
1055         case IPV6_RECVERR:
1056                 val = np->recverr;
1057                 break;
1058
1059         case IPV6_FLOWINFO_SEND:
1060                 val = np->sndflow;
1061                 break;
1062
1063         case IPV6_ADDR_PREFERENCES:
1064                 val = 0;
1065
1066                 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1067                         val |= IPV6_PREFER_SRC_TMP;
1068                 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1069                         val |= IPV6_PREFER_SRC_PUBLIC;
1070                 else {
1071                         /* XXX: should we return system default? */
1072                         val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1073                 }
1074
1075                 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1076                         val |= IPV6_PREFER_SRC_COA;
1077                 else
1078                         val |= IPV6_PREFER_SRC_HOME;
1079                 break;
1080
1081         default:
1082                 return -ENOPROTOOPT;
1083         }
1084         len = min_t(unsigned int, sizeof(int), len);
1085         if(put_user(len, optlen))
1086                 return -EFAULT;
1087         if(copy_to_user(optval,&val,len))
1088                 return -EFAULT;
1089         return 0;
1090 }
1091
1092 int 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                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1099
1100         if(level != SOL_IPV6)
1101                 return -ENOPROTOOPT;
1102
1103         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1104 #ifdef CONFIG_NETFILTER
1105         /* we need to exclude all possible ENOPROTOOPTs except default case */
1106         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1107                 int len;
1108
1109                 if (get_user(len, optlen))
1110                         return -EFAULT;
1111
1112                 lock_sock(sk);
1113                 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1114                                 &len);
1115                 release_sock(sk);
1116                 if (err >= 0)
1117                         err = put_user(len, optlen);
1118         }
1119 #endif
1120         return err;
1121 }
1122
1123 EXPORT_SYMBOL(ipv6_getsockopt);
1124
1125 #ifdef CONFIG_COMPAT
1126 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1127                            char __user *optval, int __user *optlen)
1128 {
1129         int err;
1130
1131         if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1132                 if (udp_prot.compat_getsockopt != NULL)
1133                         return udp_prot.compat_getsockopt(sk, level, optname,
1134                                                           optval, optlen);
1135                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1136         }
1137
1138         if (level != SOL_IPV6)
1139                 return -ENOPROTOOPT;
1140
1141         if (optname == MCAST_MSFILTER)
1142                 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1143                         ipv6_getsockopt);
1144
1145         err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1146 #ifdef CONFIG_NETFILTER
1147         /* we need to exclude all possible ENOPROTOOPTs except default case */
1148         if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1149                 int len;
1150
1151                 if (get_user(len, optlen))
1152                         return -EFAULT;
1153
1154                 lock_sock(sk);
1155                 err = compat_nf_getsockopt(sk, PF_INET6,
1156                                            optname, optval, &len);
1157                 release_sock(sk);
1158                 if (err >= 0)
1159                         err = put_user(len, optlen);
1160         }
1161 #endif
1162         return err;
1163 }
1164
1165 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1166 #endif
1167