linux/net/ipv6/ipv6_sockglue.c
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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 *      This program is free software; you can redistribute it and/or
  11 *      modify it under the terms of the GNU General Public License
  12 *      as published by the Free Software Foundation; either version
  13 *      2 of the License, or (at your option) any later version.
  14 *
  15 *      FIXME: Make the setsockopt code POSIX compliant: That is
  16 *
  17 *      o       Truncate getsockopt returns
  18 *      o       Return an optlen of the truncated length if need be
  19 *
  20 *      Changes:
  21 *      David L Stevens <dlstevens@us.ibm.com>:
  22 *              - added multicast source filtering API for MLDv2
  23 */
  24
  25#include <linux/module.h>
  26#include <linux/capability.h>
  27#include <linux/errno.h>
  28#include <linux/types.h>
  29#include <linux/socket.h>
  30#include <linux/sockios.h>
  31#include <linux/net.h>
  32#include <linux/in6.h>
  33#include <linux/mroute6.h>
  34#include <linux/netdevice.h>
  35#include <linux/if_arp.h>
  36#include <linux/init.h>
  37#include <linux/sysctl.h>
  38#include <linux/netfilter.h>
  39#include <linux/slab.h>
  40
  41#include <net/sock.h>
  42#include <net/snmp.h>
  43#include <net/ipv6.h>
  44#include <net/ndisc.h>
  45#include <net/protocol.h>
  46#include <net/transp_v6.h>
  47#include <net/ip6_route.h>
  48#include <net/addrconf.h>
  49#include <net/inet_common.h>
  50#include <net/tcp.h>
  51#include <net/udp.h>
  52#include <net/udplite.h>
  53#include <net/xfrm.h>
  54#include <net/compat.h>
  55
  56#include <asm/uaccess.h>
  57
  58struct ip6_ra_chain *ip6_ra_chain;
  59DEFINE_RWLOCK(ip6_ra_lock);
  60
  61int ip6_ra_control(struct sock *sk, int sel)
  62{
  63        struct ip6_ra_chain *ra, *new_ra, **rap;
  64
  65        /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  66        if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
  67                return -ENOPROTOOPT;
  68
  69        new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  70
  71        write_lock_bh(&ip6_ra_lock);
  72        for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  73                if (ra->sk == sk) {
  74                        if (sel>=0) {
  75                                write_unlock_bh(&ip6_ra_lock);
  76                                kfree(new_ra);
  77                                return -EADDRINUSE;
  78                        }
  79
  80                        *rap = ra->next;
  81                        write_unlock_bh(&ip6_ra_lock);
  82
  83                        sock_put(sk);
  84                        kfree(ra);
  85                        return 0;
  86                }
  87        }
  88        if (new_ra == NULL) {
  89                write_unlock_bh(&ip6_ra_lock);
  90                return -ENOBUFS;
  91        }
  92        new_ra->sk = sk;
  93        new_ra->sel = sel;
  94        new_ra->next = ra;
  95        *rap = new_ra;
  96        sock_hold(sk);
  97        write_unlock_bh(&ip6_ra_lock);
  98        return 0;
  99}
 100
 101static
 102struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 103                                           struct ipv6_txoptions *opt)
 104{
 105        if (inet_sk(sk)->is_icsk) {
 106                if (opt &&
 107                    !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 108                    inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
 109                        struct inet_connection_sock *icsk = inet_csk(sk);
 110                        icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 111                        icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 112                }
 113                opt = xchg(&inet6_sk(sk)->opt, opt);
 114        } else {
 115                spin_lock(&sk->sk_dst_lock);
 116                opt = xchg(&inet6_sk(sk)->opt, opt);
 117                spin_unlock(&sk->sk_dst_lock);
 118        }
 119        sk_dst_reset(sk);
 120
 121        return opt;
 122}
 123
 124static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 125                    char __user *optval, unsigned int optlen)
 126{
 127        struct ipv6_pinfo *np = inet6_sk(sk);
 128        struct net *net = sock_net(sk);
 129        int val, valbool;
 130        int retv = -ENOPROTOOPT;
 131
 132        if (optval == NULL)
 133                val=0;
 134        else {
 135                if (optlen >= sizeof(int)) {
 136                        if (get_user(val, (int __user *) optval))
 137                                return -EFAULT;
 138                } else
 139                        val = 0;
 140        }
 141
 142        valbool = (val!=0);
 143
 144        if (ip6_mroute_opt(optname))
 145                return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 146
 147        lock_sock(sk);
 148
 149        switch (optname) {
 150
 151        case IPV6_ADDRFORM:
 152                if (optlen < sizeof(int))
 153                        goto e_inval;
 154                if (val == PF_INET) {
 155                        struct ipv6_txoptions *opt;
 156                        struct sk_buff *pktopt;
 157
 158                        if (sk->sk_type == SOCK_RAW)
 159                                break;
 160
 161                        if (sk->sk_protocol == IPPROTO_UDP ||
 162                            sk->sk_protocol == IPPROTO_UDPLITE) {
 163                                struct udp_sock *up = udp_sk(sk);
 164                                if (up->pending == AF_INET6) {
 165                                        retv = -EBUSY;
 166                                        break;
 167                                }
 168                        } else if (sk->sk_protocol != IPPROTO_TCP)
 169                                break;
 170
 171                        if (sk->sk_state != TCP_ESTABLISHED) {
 172                                retv = -ENOTCONN;
 173                                break;
 174                        }
 175
 176                        if (ipv6_only_sock(sk) ||
 177                            !ipv6_addr_v4mapped(&np->daddr)) {
 178                                retv = -EADDRNOTAVAIL;
 179                                break;
 180                        }
 181
 182                        fl6_free_socklist(sk);
 183                        ipv6_sock_mc_close(sk);
 184
 185                        /*
 186                         * Sock is moving from IPv6 to IPv4 (sk_prot), so
 187                         * remove it from the refcnt debug socks count in the
 188                         * original family...
 189                         */
 190                        sk_refcnt_debug_dec(sk);
 191
 192                        if (sk->sk_protocol == IPPROTO_TCP) {
 193                                struct inet_connection_sock *icsk = inet_csk(sk);
 194                                local_bh_disable();
 195                                sock_prot_inuse_add(net, sk->sk_prot, -1);
 196                                sock_prot_inuse_add(net, &tcp_prot, 1);
 197                                local_bh_enable();
 198                                sk->sk_prot = &tcp_prot;
 199                                icsk->icsk_af_ops = &ipv4_specific;
 200                                sk->sk_socket->ops = &inet_stream_ops;
 201                                sk->sk_family = PF_INET;
 202                                tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 203                        } else {
 204                                struct proto *prot = &udp_prot;
 205
 206                                if (sk->sk_protocol == IPPROTO_UDPLITE)
 207                                        prot = &udplite_prot;
 208                                local_bh_disable();
 209                                sock_prot_inuse_add(net, sk->sk_prot, -1);
 210                                sock_prot_inuse_add(net, prot, 1);
 211                                local_bh_enable();
 212                                sk->sk_prot = prot;
 213                                sk->sk_socket->ops = &inet_dgram_ops;
 214                                sk->sk_family = PF_INET;
 215                        }
 216                        opt = xchg(&np->opt, NULL);
 217                        if (opt)
 218                                sock_kfree_s(sk, opt, opt->tot_len);
 219                        pktopt = xchg(&np->pktoptions, NULL);
 220                        kfree_skb(pktopt);
 221
 222                        sk->sk_destruct = inet_sock_destruct;
 223                        /*
 224                         * ... and add it to the refcnt debug socks count
 225                         * in the new family. -acme
 226                         */
 227                        sk_refcnt_debug_inc(sk);
 228                        module_put(THIS_MODULE);
 229                        retv = 0;
 230                        break;
 231                }
 232                goto e_inval;
 233
 234        case IPV6_V6ONLY:
 235                if (optlen < sizeof(int) ||
 236                    inet_sk(sk)->inet_num)
 237                        goto e_inval;
 238                np->ipv6only = valbool;
 239                retv = 0;
 240                break;
 241
 242        case IPV6_RECVPKTINFO:
 243                if (optlen < sizeof(int))
 244                        goto e_inval;
 245                np->rxopt.bits.rxinfo = valbool;
 246                retv = 0;
 247                break;
 248
 249        case IPV6_2292PKTINFO:
 250                if (optlen < sizeof(int))
 251                        goto e_inval;
 252                np->rxopt.bits.rxoinfo = valbool;
 253                retv = 0;
 254                break;
 255
 256        case IPV6_RECVHOPLIMIT:
 257                if (optlen < sizeof(int))
 258                        goto e_inval;
 259                np->rxopt.bits.rxhlim = valbool;
 260                retv = 0;
 261                break;
 262
 263        case IPV6_2292HOPLIMIT:
 264                if (optlen < sizeof(int))
 265                        goto e_inval;
 266                np->rxopt.bits.rxohlim = valbool;
 267                retv = 0;
 268                break;
 269
 270        case IPV6_RECVRTHDR:
 271                if (optlen < sizeof(int))
 272                        goto e_inval;
 273                np->rxopt.bits.srcrt = valbool;
 274                retv = 0;
 275                break;
 276
 277        case IPV6_2292RTHDR:
 278                if (optlen < sizeof(int))
 279                        goto e_inval;
 280                np->rxopt.bits.osrcrt = valbool;
 281                retv = 0;
 282                break;
 283
 284        case IPV6_RECVHOPOPTS:
 285                if (optlen < sizeof(int))
 286                        goto e_inval;
 287                np->rxopt.bits.hopopts = valbool;
 288                retv = 0;
 289                break;
 290
 291        case IPV6_2292HOPOPTS:
 292                if (optlen < sizeof(int))
 293                        goto e_inval;
 294                np->rxopt.bits.ohopopts = valbool;
 295                retv = 0;
 296                break;
 297
 298        case IPV6_RECVDSTOPTS:
 299                if (optlen < sizeof(int))
 300                        goto e_inval;
 301                np->rxopt.bits.dstopts = valbool;
 302                retv = 0;
 303                break;
 304
 305        case IPV6_2292DSTOPTS:
 306                if (optlen < sizeof(int))
 307                        goto e_inval;
 308                np->rxopt.bits.odstopts = valbool;
 309                retv = 0;
 310                break;
 311
 312        case IPV6_TCLASS:
 313                if (optlen < sizeof(int))
 314                        goto e_inval;
 315                if (val < -1 || val > 0xff)
 316                        goto e_inval;
 317                /* RFC 3542, 6.5: default traffic class of 0x0 */
 318                if (val == -1)
 319                        val = 0;
 320                np->tclass = val;
 321                retv = 0;
 322                break;
 323
 324        case IPV6_RECVTCLASS:
 325                if (optlen < sizeof(int))
 326                        goto e_inval;
 327                np->rxopt.bits.rxtclass = valbool;
 328                retv = 0;
 329                break;
 330
 331        case IPV6_FLOWINFO:
 332                if (optlen < sizeof(int))
 333                        goto e_inval;
 334                np->rxopt.bits.rxflow = valbool;
 335                retv = 0;
 336                break;
 337
 338        case IPV6_RECVPATHMTU:
 339                if (optlen < sizeof(int))
 340                        goto e_inval;
 341                np->rxopt.bits.rxpmtu = valbool;
 342                retv = 0;
 343                break;
 344
 345        case IPV6_TRANSPARENT:
 346                if (!capable(CAP_NET_ADMIN)) {
 347                        retv = -EPERM;
 348                        break;
 349                }
 350                if (optlen < sizeof(int))
 351                        goto e_inval;
 352                /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
 353                inet_sk(sk)->transparent = valbool;
 354                retv = 0;
 355                break;
 356
 357        case IPV6_RECVORIGDSTADDR:
 358                if (optlen < sizeof(int))
 359                        goto e_inval;
 360                np->rxopt.bits.rxorigdstaddr = valbool;
 361                retv = 0;
 362                break;
 363
 364        case IPV6_HOPOPTS:
 365        case IPV6_RTHDRDSTOPTS:
 366        case IPV6_RTHDR:
 367        case IPV6_DSTOPTS:
 368        {
 369                struct ipv6_txoptions *opt;
 370
 371                /* remove any sticky options header with a zero option
 372                 * length, per RFC3542.
 373                 */
 374                if (optlen == 0)
 375                        optval = NULL;
 376                else if (optval == NULL)
 377                        goto e_inval;
 378                else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 379                         optlen & 0x7 || optlen > 8 * 255)
 380                        goto e_inval;
 381
 382                /* hop-by-hop / destination options are privileged option */
 383                retv = -EPERM;
 384                if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 385                        break;
 386
 387                opt = ipv6_renew_options(sk, np->opt, optname,
 388                                         (struct ipv6_opt_hdr __user *)optval,
 389                                         optlen);
 390                if (IS_ERR(opt)) {
 391                        retv = PTR_ERR(opt);
 392                        break;
 393                }
 394
 395                /* routing header option needs extra check */
 396                retv = -EINVAL;
 397                if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 398                        struct ipv6_rt_hdr *rthdr = opt->srcrt;
 399                        switch (rthdr->type) {
 400#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 401                        case IPV6_SRCRT_TYPE_2:
 402                                if (rthdr->hdrlen != 2 ||
 403                                    rthdr->segments_left != 1)
 404                                        goto sticky_done;
 405
 406                                break;
 407#endif
 408                        default:
 409                                goto sticky_done;
 410                        }
 411                }
 412
 413                retv = 0;
 414                opt = ipv6_update_options(sk, opt);
 415sticky_done:
 416                if (opt)
 417                        sock_kfree_s(sk, opt, opt->tot_len);
 418                break;
 419        }
 420
 421        case IPV6_PKTINFO:
 422        {
 423                struct in6_pktinfo pkt;
 424
 425                if (optlen == 0)
 426                        goto e_inval;
 427                else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
 428                        goto e_inval;
 429
 430                if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 431                                retv = -EFAULT;
 432                                break;
 433                }
 434                if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 435                        goto e_inval;
 436
 437                np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 438                ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
 439                retv = 0;
 440                break;
 441        }
 442
 443        case IPV6_2292PKTOPTIONS:
 444        {
 445                struct ipv6_txoptions *opt = NULL;
 446                struct msghdr msg;
 447                struct flowi fl;
 448                int junk;
 449
 450                fl.fl6_flowlabel = 0;
 451                fl.oif = sk->sk_bound_dev_if;
 452                fl.mark = sk->sk_mark;
 453
 454                if (optlen == 0)
 455                        goto update;
 456
 457                /* 1K is probably excessive
 458                 * 1K is surely not enough, 2K per standard header is 16K.
 459                 */
 460                retv = -EINVAL;
 461                if (optlen > 64*1024)
 462                        break;
 463
 464                opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 465                retv = -ENOBUFS;
 466                if (opt == NULL)
 467                        break;
 468
 469                memset(opt, 0, sizeof(*opt));
 470                opt->tot_len = sizeof(*opt) + optlen;
 471                retv = -EFAULT;
 472                if (copy_from_user(opt+1, optval, optlen))
 473                        goto done;
 474
 475                msg.msg_controllen = optlen;
 476                msg.msg_control = (void*)(opt+1);
 477
 478                retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk,
 479                                         &junk);
 480                if (retv)
 481                        goto done;
 482update:
 483                retv = 0;
 484                opt = ipv6_update_options(sk, opt);
 485done:
 486                if (opt)
 487                        sock_kfree_s(sk, opt, opt->tot_len);
 488                break;
 489        }
 490        case IPV6_UNICAST_HOPS:
 491                if (optlen < sizeof(int))
 492                        goto e_inval;
 493                if (val > 255 || val < -1)
 494                        goto e_inval;
 495                np->hop_limit = val;
 496                retv = 0;
 497                break;
 498
 499        case IPV6_MULTICAST_HOPS:
 500                if (sk->sk_type == SOCK_STREAM)
 501                        break;
 502                if (optlen < sizeof(int))
 503                        goto e_inval;
 504                if (val > 255 || val < -1)
 505                        goto e_inval;
 506                np->mcast_hops = val;
 507                retv = 0;
 508                break;
 509
 510        case IPV6_MULTICAST_LOOP:
 511                if (optlen < sizeof(int))
 512                        goto e_inval;
 513                if (val != valbool)
 514                        goto e_inval;
 515                np->mc_loop = valbool;
 516                retv = 0;
 517                break;
 518
 519        case IPV6_MULTICAST_IF:
 520                if (sk->sk_type == SOCK_STREAM)
 521                        break;
 522                if (optlen < sizeof(int))
 523                        goto e_inval;
 524
 525                if (val) {
 526                        struct net_device *dev;
 527
 528                        if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 529                                goto e_inval;
 530
 531                        dev = dev_get_by_index(net, val);
 532                        if (!dev) {
 533                                retv = -ENODEV;
 534                                break;
 535                        }
 536                        dev_put(dev);
 537                }
 538                np->mcast_oif = val;
 539                retv = 0;
 540                break;
 541        case IPV6_ADD_MEMBERSHIP:
 542        case IPV6_DROP_MEMBERSHIP:
 543        {
 544                struct ipv6_mreq mreq;
 545
 546                if (optlen < sizeof(struct ipv6_mreq))
 547                        goto e_inval;
 548
 549                retv = -EPROTO;
 550                if (inet_sk(sk)->is_icsk)
 551                        break;
 552
 553                retv = -EFAULT;
 554                if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 555                        break;
 556
 557                if (optname == IPV6_ADD_MEMBERSHIP)
 558                        retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 559                else
 560                        retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 561                break;
 562        }
 563        case IPV6_JOIN_ANYCAST:
 564        case IPV6_LEAVE_ANYCAST:
 565        {
 566                struct ipv6_mreq mreq;
 567
 568                if (optlen < sizeof(struct ipv6_mreq))
 569                        goto e_inval;
 570
 571                retv = -EFAULT;
 572                if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 573                        break;
 574
 575                if (optname == IPV6_JOIN_ANYCAST)
 576                        retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 577                else
 578                        retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 579                break;
 580        }
 581        case MCAST_JOIN_GROUP:
 582        case MCAST_LEAVE_GROUP:
 583        {
 584                struct group_req greq;
 585                struct sockaddr_in6 *psin6;
 586
 587                if (optlen < sizeof(struct group_req))
 588                        goto e_inval;
 589
 590                retv = -EFAULT;
 591                if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 592                        break;
 593                if (greq.gr_group.ss_family != AF_INET6) {
 594                        retv = -EADDRNOTAVAIL;
 595                        break;
 596                }
 597                psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 598                if (optname == MCAST_JOIN_GROUP)
 599                        retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 600                                &psin6->sin6_addr);
 601                else
 602                        retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 603                                &psin6->sin6_addr);
 604                break;
 605        }
 606        case MCAST_JOIN_SOURCE_GROUP:
 607        case MCAST_LEAVE_SOURCE_GROUP:
 608        case MCAST_BLOCK_SOURCE:
 609        case MCAST_UNBLOCK_SOURCE:
 610        {
 611                struct group_source_req greqs;
 612                int omode, add;
 613
 614                if (optlen < sizeof(struct group_source_req))
 615                        goto e_inval;
 616                if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 617                        retv = -EFAULT;
 618                        break;
 619                }
 620                if (greqs.gsr_group.ss_family != AF_INET6 ||
 621                    greqs.gsr_source.ss_family != AF_INET6) {
 622                        retv = -EADDRNOTAVAIL;
 623                        break;
 624                }
 625                if (optname == MCAST_BLOCK_SOURCE) {
 626                        omode = MCAST_EXCLUDE;
 627                        add = 1;
 628                } else if (optname == MCAST_UNBLOCK_SOURCE) {
 629                        omode = MCAST_EXCLUDE;
 630                        add = 0;
 631                } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 632                        struct sockaddr_in6 *psin6;
 633
 634                        psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 635                        retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 636                                &psin6->sin6_addr);
 637                        /* prior join w/ different source is ok */
 638                        if (retv && retv != -EADDRINUSE)
 639                                break;
 640                        omode = MCAST_INCLUDE;
 641                        add = 1;
 642                } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 643                        omode = MCAST_INCLUDE;
 644                        add = 0;
 645                }
 646                retv = ip6_mc_source(add, omode, sk, &greqs);
 647                break;
 648        }
 649        case MCAST_MSFILTER:
 650        {
 651                extern int sysctl_mld_max_msf;
 652                struct group_filter *gsf;
 653
 654                if (optlen < GROUP_FILTER_SIZE(0))
 655                        goto e_inval;
 656                if (optlen > sysctl_optmem_max) {
 657                        retv = -ENOBUFS;
 658                        break;
 659                }
 660                gsf = kmalloc(optlen,GFP_KERNEL);
 661                if (!gsf) {
 662                        retv = -ENOBUFS;
 663                        break;
 664                }
 665                retv = -EFAULT;
 666                if (copy_from_user(gsf, optval, optlen)) {
 667                        kfree(gsf);
 668                        break;
 669                }
 670                /* numsrc >= (4G-140)/128 overflow in 32 bits */
 671                if (gsf->gf_numsrc >= 0x1ffffffU ||
 672                    gsf->gf_numsrc > sysctl_mld_max_msf) {
 673                        kfree(gsf);
 674                        retv = -ENOBUFS;
 675                        break;
 676                }
 677                if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 678                        kfree(gsf);
 679                        retv = -EINVAL;
 680                        break;
 681                }
 682                retv = ip6_mc_msfilter(sk, gsf);
 683                kfree(gsf);
 684
 685                break;
 686        }
 687        case IPV6_ROUTER_ALERT:
 688                if (optlen < sizeof(int))
 689                        goto e_inval;
 690                retv = ip6_ra_control(sk, val);
 691                break;
 692        case IPV6_MTU_DISCOVER:
 693                if (optlen < sizeof(int))
 694                        goto e_inval;
 695                if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
 696                        goto e_inval;
 697                np->pmtudisc = val;
 698                retv = 0;
 699                break;
 700        case IPV6_MTU:
 701                if (optlen < sizeof(int))
 702                        goto e_inval;
 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                if (optlen < sizeof(int))
 710                        goto e_inval;
 711                np->recverr = valbool;
 712                if (!val)
 713                        skb_queue_purge(&sk->sk_error_queue);
 714                retv = 0;
 715                break;
 716        case IPV6_FLOWINFO_SEND:
 717                if (optlen < sizeof(int))
 718                        goto e_inval;
 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        case IPV6_ADDR_PREFERENCES:
 734            {
 735                unsigned int pref = 0;
 736                unsigned int prefmask = ~0;
 737
 738                if (optlen < sizeof(int))
 739                        goto e_inval;
 740
 741                retv = -EINVAL;
 742
 743                /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 744                switch (val & (IPV6_PREFER_SRC_PUBLIC|
 745                               IPV6_PREFER_SRC_TMP|
 746                               IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 747                case IPV6_PREFER_SRC_PUBLIC:
 748                        pref |= IPV6_PREFER_SRC_PUBLIC;
 749                        break;
 750                case IPV6_PREFER_SRC_TMP:
 751                        pref |= IPV6_PREFER_SRC_TMP;
 752                        break;
 753                case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 754                        break;
 755                case 0:
 756                        goto pref_skip_pubtmp;
 757                default:
 758                        goto e_inval;
 759                }
 760
 761                prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 762                              IPV6_PREFER_SRC_TMP);
 763pref_skip_pubtmp:
 764
 765                /* check HOME/COA conflicts */
 766                switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 767                case IPV6_PREFER_SRC_HOME:
 768                        break;
 769                case IPV6_PREFER_SRC_COA:
 770                        pref |= IPV6_PREFER_SRC_COA;
 771                case 0:
 772                        goto pref_skip_coa;
 773                default:
 774                        goto e_inval;
 775                }
 776
 777                prefmask &= ~IPV6_PREFER_SRC_COA;
 778pref_skip_coa:
 779
 780                /* check CGA/NONCGA conflicts */
 781                switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 782                case IPV6_PREFER_SRC_CGA:
 783                case IPV6_PREFER_SRC_NONCGA:
 784                case 0:
 785                        break;
 786                default:
 787                        goto e_inval;
 788                }
 789
 790                np->srcprefs = (np->srcprefs & prefmask) | pref;
 791                retv = 0;
 792
 793                break;
 794            }
 795        case IPV6_MINHOPCOUNT:
 796                if (optlen < sizeof(int))
 797                        goto e_inval;
 798                if (val < 0 || val > 255)
 799                        goto e_inval;
 800                np->min_hopcount = val;
 801                break;
 802        case IPV6_DONTFRAG:
 803                np->dontfrag = valbool;
 804                retv = 0;
 805                break;
 806        }
 807
 808        release_sock(sk);
 809
 810        return retv;
 811
 812e_inval:
 813        release_sock(sk);
 814        return -EINVAL;
 815}
 816
 817int ipv6_setsockopt(struct sock *sk, int level, int optname,
 818                    char __user *optval, unsigned int optlen)
 819{
 820        int err;
 821
 822        if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 823                return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 824
 825        if (level != SOL_IPV6)
 826                return -ENOPROTOOPT;
 827
 828        err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 829#ifdef CONFIG_NETFILTER
 830        /* we need to exclude all possible ENOPROTOOPTs except default case */
 831        if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 832                        optname != IPV6_XFRM_POLICY) {
 833                lock_sock(sk);
 834                err = nf_setsockopt(sk, PF_INET6, optname, optval,
 835                                optlen);
 836                release_sock(sk);
 837        }
 838#endif
 839        return err;
 840}
 841
 842EXPORT_SYMBOL(ipv6_setsockopt);
 843
 844#ifdef CONFIG_COMPAT
 845int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 846                           char __user *optval, unsigned int optlen)
 847{
 848        int err;
 849
 850        if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 851                if (udp_prot.compat_setsockopt != NULL)
 852                        return udp_prot.compat_setsockopt(sk, level, optname,
 853                                                          optval, optlen);
 854                return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 855        }
 856
 857        if (level != SOL_IPV6)
 858                return -ENOPROTOOPT;
 859
 860        if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 861                return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 862                        ipv6_setsockopt);
 863
 864        err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 865#ifdef CONFIG_NETFILTER
 866        /* we need to exclude all possible ENOPROTOOPTs except default case */
 867        if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 868            optname != IPV6_XFRM_POLICY) {
 869                lock_sock(sk);
 870                err = compat_nf_setsockopt(sk, PF_INET6, optname,
 871                                           optval, optlen);
 872                release_sock(sk);
 873        }
 874#endif
 875        return err;
 876}
 877
 878EXPORT_SYMBOL(compat_ipv6_setsockopt);
 879#endif
 880
 881static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 882                                  int optname, char __user *optval, int len)
 883{
 884        struct ipv6_opt_hdr *hdr;
 885
 886        if (!opt)
 887                return 0;
 888
 889        switch(optname) {
 890        case IPV6_HOPOPTS:
 891                hdr = opt->hopopt;
 892                break;
 893        case IPV6_RTHDRDSTOPTS:
 894                hdr = opt->dst0opt;
 895                break;
 896        case IPV6_RTHDR:
 897                hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 898                break;
 899        case IPV6_DSTOPTS:
 900                hdr = opt->dst1opt;
 901                break;
 902        default:
 903                return -EINVAL; /* should not happen */
 904        }
 905
 906        if (!hdr)
 907                return 0;
 908
 909        len = min_t(unsigned int, len, ipv6_optlen(hdr));
 910        if (copy_to_user(optval, hdr, len))
 911                return -EFAULT;
 912        return len;
 913}
 914
 915static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 916                    char __user *optval, int __user *optlen)
 917{
 918        struct ipv6_pinfo *np = inet6_sk(sk);
 919        int len;
 920        int val;
 921
 922        if (ip6_mroute_opt(optname))
 923                return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 924
 925        if (get_user(len, optlen))
 926                return -EFAULT;
 927        switch (optname) {
 928        case IPV6_ADDRFORM:
 929                if (sk->sk_protocol != IPPROTO_UDP &&
 930                    sk->sk_protocol != IPPROTO_UDPLITE &&
 931                    sk->sk_protocol != IPPROTO_TCP)
 932                        return -ENOPROTOOPT;
 933                if (sk->sk_state != TCP_ESTABLISHED)
 934                        return -ENOTCONN;
 935                val = sk->sk_family;
 936                break;
 937        case MCAST_MSFILTER:
 938        {
 939                struct group_filter gsf;
 940                int err;
 941
 942                if (len < GROUP_FILTER_SIZE(0))
 943                        return -EINVAL;
 944                if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 945                        return -EFAULT;
 946                if (gsf.gf_group.ss_family != AF_INET6)
 947                        return -EADDRNOTAVAIL;
 948                lock_sock(sk);
 949                err = ip6_mc_msfget(sk, &gsf,
 950                        (struct group_filter __user *)optval, optlen);
 951                release_sock(sk);
 952                return err;
 953        }
 954
 955        case IPV6_2292PKTOPTIONS:
 956        {
 957                struct msghdr msg;
 958                struct sk_buff *skb;
 959
 960                if (sk->sk_type != SOCK_STREAM)
 961                        return -ENOPROTOOPT;
 962
 963                msg.msg_control = optval;
 964                msg.msg_controllen = len;
 965                msg.msg_flags = 0;
 966
 967                lock_sock(sk);
 968                skb = np->pktoptions;
 969                if (skb)
 970                        atomic_inc(&skb->users);
 971                release_sock(sk);
 972
 973                if (skb) {
 974                        int err = datagram_recv_ctl(sk, &msg, skb);
 975                        kfree_skb(skb);
 976                        if (err)
 977                                return err;
 978                } else {
 979                        if (np->rxopt.bits.rxinfo) {
 980                                struct in6_pktinfo src_info;
 981                                src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 982                                        np->sticky_pktinfo.ipi6_ifindex;
 983                                np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 984                                        ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 985                                put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 986                        }
 987                        if (np->rxopt.bits.rxhlim) {
 988                                int hlim = np->mcast_hops;
 989                                put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 990                        }
 991                        if (np->rxopt.bits.rxoinfo) {
 992                                struct in6_pktinfo src_info;
 993                                src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 994                                        np->sticky_pktinfo.ipi6_ifindex;
 995                                np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 996                                        ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 997                                put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 998                        }
 999                        if (np->rxopt.bits.rxohlim) {
1000                                int hlim = np->mcast_hops;
1001                                put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1002                        }
1003                }
1004                len -= msg.msg_controllen;
1005                return put_user(len, optlen);
1006        }
1007        case IPV6_MTU:
1008        {
1009                struct dst_entry *dst;
1010
1011                val = 0;
1012                rcu_read_lock();
1013                dst = __sk_dst_get(sk);
1014                if (dst)
1015                        val = dst_mtu(dst);
1016                rcu_read_unlock();
1017                if (!val)
1018                        return -ENOTCONN;
1019                break;
1020        }
1021
1022        case IPV6_V6ONLY:
1023                val = np->ipv6only;
1024                break;
1025
1026        case IPV6_RECVPKTINFO:
1027                val = np->rxopt.bits.rxinfo;
1028                break;
1029
1030        case IPV6_2292PKTINFO:
1031                val = np->rxopt.bits.rxoinfo;
1032                break;
1033
1034        case IPV6_RECVHOPLIMIT:
1035                val = np->rxopt.bits.rxhlim;
1036                break;
1037
1038        case IPV6_2292HOPLIMIT:
1039                val = np->rxopt.bits.rxohlim;
1040                break;
1041
1042        case IPV6_RECVRTHDR:
1043                val = np->rxopt.bits.srcrt;
1044                break;
1045
1046        case IPV6_2292RTHDR:
1047                val = np->rxopt.bits.osrcrt;
1048                break;
1049
1050        case IPV6_HOPOPTS:
1051        case IPV6_RTHDRDSTOPTS:
1052        case IPV6_RTHDR:
1053        case IPV6_DSTOPTS:
1054        {
1055
1056                lock_sock(sk);
1057                len = ipv6_getsockopt_sticky(sk, np->opt,
1058                                             optname, optval, len);
1059                release_sock(sk);
1060                /* check if ipv6_getsockopt_sticky() returns err code */
1061                if (len < 0)
1062                        return len;
1063                return put_user(len, optlen);
1064        }
1065
1066        case IPV6_RECVHOPOPTS:
1067                val = np->rxopt.bits.hopopts;
1068                break;
1069
1070        case IPV6_2292HOPOPTS:
1071                val = np->rxopt.bits.ohopopts;
1072                break;
1073
1074        case IPV6_RECVDSTOPTS:
1075                val = np->rxopt.bits.dstopts;
1076                break;
1077
1078        case IPV6_2292DSTOPTS:
1079                val = np->rxopt.bits.odstopts;
1080                break;
1081
1082        case IPV6_TCLASS:
1083                val = np->tclass;
1084                break;
1085
1086        case IPV6_RECVTCLASS:
1087                val = np->rxopt.bits.rxtclass;
1088                break;
1089
1090        case IPV6_FLOWINFO:
1091                val = np->rxopt.bits.rxflow;
1092                break;
1093
1094        case IPV6_RECVPATHMTU:
1095                val = np->rxopt.bits.rxpmtu;
1096                break;
1097
1098        case IPV6_PATHMTU:
1099        {
1100                struct dst_entry *dst;
1101                struct ip6_mtuinfo mtuinfo;
1102
1103                if (len < sizeof(mtuinfo))
1104                        return -EINVAL;
1105
1106                len = sizeof(mtuinfo);
1107                memset(&mtuinfo, 0, sizeof(mtuinfo));
1108
1109                rcu_read_lock();
1110                dst = __sk_dst_get(sk);
1111                if (dst)
1112                        mtuinfo.ip6m_mtu = dst_mtu(dst);
1113                rcu_read_unlock();
1114                if (!mtuinfo.ip6m_mtu)
1115                        return -ENOTCONN;
1116
1117                if (put_user(len, optlen))
1118                        return -EFAULT;
1119                if (copy_to_user(optval, &mtuinfo, len))
1120                        return -EFAULT;
1121
1122                return 0;
1123                break;
1124        }
1125
1126        case IPV6_TRANSPARENT:
1127                val = inet_sk(sk)->transparent;
1128                break;
1129
1130        case IPV6_RECVORIGDSTADDR:
1131                val = np->rxopt.bits.rxorigdstaddr;
1132                break;
1133
1134        case IPV6_UNICAST_HOPS:
1135        case IPV6_MULTICAST_HOPS:
1136        {
1137                struct dst_entry *dst;
1138
1139                if (optname == IPV6_UNICAST_HOPS)
1140                        val = np->hop_limit;
1141                else
1142                        val = np->mcast_hops;
1143
1144                if (val < 0) {
1145                        rcu_read_lock();
1146                        dst = __sk_dst_get(sk);
1147                        if (dst)
1148                                val = ip6_dst_hoplimit(dst);
1149                        rcu_read_unlock();
1150                }
1151
1152                if (val < 0)
1153                        val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1154                break;
1155        }
1156
1157        case IPV6_MULTICAST_LOOP:
1158                val = np->mc_loop;
1159                break;
1160
1161        case IPV6_MULTICAST_IF:
1162                val = np->mcast_oif;
1163                break;
1164
1165        case IPV6_MTU_DISCOVER:
1166                val = np->pmtudisc;
1167                break;
1168
1169        case IPV6_RECVERR:
1170                val = np->recverr;
1171                break;
1172
1173        case IPV6_FLOWINFO_SEND:
1174                val = np->sndflow;
1175                break;
1176
1177        case IPV6_ADDR_PREFERENCES:
1178                val = 0;
1179
1180                if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1181                        val |= IPV6_PREFER_SRC_TMP;
1182                else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1183                        val |= IPV6_PREFER_SRC_PUBLIC;
1184                else {
1185                        /* XXX: should we return system default? */
1186                        val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1187                }
1188
1189                if (np->srcprefs & IPV6_PREFER_SRC_COA)
1190                        val |= IPV6_PREFER_SRC_COA;
1191                else
1192                        val |= IPV6_PREFER_SRC_HOME;
1193                break;
1194
1195        case IPV6_MINHOPCOUNT:
1196                val = np->min_hopcount;
1197                break;
1198
1199        case IPV6_DONTFRAG:
1200                val = np->dontfrag;
1201                break;
1202
1203        default:
1204                return -ENOPROTOOPT;
1205        }
1206        len = min_t(unsigned int, sizeof(int), len);
1207        if(put_user(len, optlen))
1208                return -EFAULT;
1209        if(copy_to_user(optval,&val,len))
1210                return -EFAULT;
1211        return 0;
1212}
1213
1214int ipv6_getsockopt(struct sock *sk, int level, int optname,
1215                    char __user *optval, int __user *optlen)
1216{
1217        int err;
1218
1219        if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1220                return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1221
1222        if(level != SOL_IPV6)
1223                return -ENOPROTOOPT;
1224
1225        err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1226#ifdef CONFIG_NETFILTER
1227        /* we need to exclude all possible ENOPROTOOPTs except default case */
1228        if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1229                int len;
1230
1231                if (get_user(len, optlen))
1232                        return -EFAULT;
1233
1234                lock_sock(sk);
1235                err = nf_getsockopt(sk, PF_INET6, optname, optval,
1236                                &len);
1237                release_sock(sk);
1238                if (err >= 0)
1239                        err = put_user(len, optlen);
1240        }
1241#endif
1242        return err;
1243}
1244
1245EXPORT_SYMBOL(ipv6_getsockopt);
1246
1247#ifdef CONFIG_COMPAT
1248int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1249                           char __user *optval, int __user *optlen)
1250{
1251        int err;
1252
1253        if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1254                if (udp_prot.compat_getsockopt != NULL)
1255                        return udp_prot.compat_getsockopt(sk, level, optname,
1256                                                          optval, optlen);
1257                return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1258        }
1259
1260        if (level != SOL_IPV6)
1261                return -ENOPROTOOPT;
1262
1263        if (optname == MCAST_MSFILTER)
1264                return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1265                        ipv6_getsockopt);
1266
1267        err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1268#ifdef CONFIG_NETFILTER
1269        /* we need to exclude all possible ENOPROTOOPTs except default case */
1270        if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1271                int len;
1272
1273                if (get_user(len, optlen))
1274                        return -EFAULT;
1275
1276                lock_sock(sk);
1277                err = compat_nf_getsockopt(sk, PF_INET6,
1278                                           optname, optval, &len);
1279                release_sock(sk);
1280                if (err >= 0)
1281                        err = put_user(len, optlen);
1282        }
1283#endif
1284        return err;
1285}
1286
1287EXPORT_SYMBOL(compat_ipv6_getsockopt);
1288#endif
1289
1290