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
  40#include <net/sock.h>
  41#include <net/snmp.h>
  42#include <net/ipv6.h>
  43#include <net/ndisc.h>
  44#include <net/protocol.h>
  45#include <net/transp_v6.h>
  46#include <net/ip6_route.h>
  47#include <net/addrconf.h>
  48#include <net/inet_common.h>
  49#include <net/tcp.h>
  50#include <net/udp.h>
  51#include <net/udplite.h>
  52#include <net/xfrm.h>
  53#include <net/compat.h>
  54
  55#include <asm/uaccess.h>
  56
  57DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;
  58
  59struct ip6_ra_chain *ip6_ra_chain;
  60DEFINE_RWLOCK(ip6_ra_lock);
  61
  62int ip6_ra_control(struct sock *sk, int sel)
  63{
  64        struct ip6_ra_chain *ra, *new_ra, **rap;
  65
  66        /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  67        if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
  68                return -ENOPROTOOPT;
  69
  70        new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  71
  72        write_lock_bh(&ip6_ra_lock);
  73        for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  74                if (ra->sk == sk) {
  75                        if (sel>=0) {
  76                                write_unlock_bh(&ip6_ra_lock);
  77                                kfree(new_ra);
  78                                return -EADDRINUSE;
  79                        }
  80
  81                        *rap = ra->next;
  82                        write_unlock_bh(&ip6_ra_lock);
  83
  84                        sock_put(sk);
  85                        kfree(ra);
  86                        return 0;
  87                }
  88        }
  89        if (new_ra == NULL) {
  90                write_unlock_bh(&ip6_ra_lock);
  91                return -ENOBUFS;
  92        }
  93        new_ra->sk = sk;
  94        new_ra->sel = sel;
  95        new_ra->next = ra;
  96        *rap = new_ra;
  97        sock_hold(sk);
  98        write_unlock_bh(&ip6_ra_lock);
  99        return 0;
 100}
 101
 102static
 103struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 104                                           struct ipv6_txoptions *opt)
 105{
 106        if (inet_sk(sk)->is_icsk) {
 107                if (opt &&
 108                    !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
 109                    inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
 110                        struct inet_connection_sock *icsk = inet_csk(sk);
 111                        icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 112                        icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
 113                }
 114                opt = xchg(&inet6_sk(sk)->opt, opt);
 115        } else {
 116                write_lock(&sk->sk_dst_lock);
 117                opt = xchg(&inet6_sk(sk)->opt, opt);
 118                write_unlock(&sk->sk_dst_lock);
 119        }
 120        sk_dst_reset(sk);
 121
 122        return opt;
 123}
 124
 125static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 126                    char __user *optval, int optlen)
 127{
 128        struct ipv6_pinfo *np = inet6_sk(sk);
 129        struct net *net = sock_net(sk);
 130        int val, valbool;
 131        int retv = -ENOPROTOOPT;
 132
 133        if (optval == NULL)
 134                val=0;
 135        else {
 136                if (optlen >= sizeof(int)) {
 137                        if (get_user(val, (int __user *) optval))
 138                                return -EFAULT;
 139                } else
 140                        val = 0;
 141        }
 142
 143        valbool = (val!=0);
 144
 145        if (ip6_mroute_opt(optname))
 146                return ip6_mroute_setsockopt(sk, optname, optval, optlen);
 147
 148        lock_sock(sk);
 149
 150        switch (optname) {
 151
 152        case IPV6_ADDRFORM:
 153                if (optlen < sizeof(int))
 154                        goto e_inval;
 155                if (val == PF_INET) {
 156                        struct ipv6_txoptions *opt;
 157                        struct sk_buff *pktopt;
 158
 159                        if (sk->sk_type == SOCK_RAW)
 160                                break;
 161
 162                        if (sk->sk_protocol == IPPROTO_UDP ||
 163                            sk->sk_protocol == IPPROTO_UDPLITE) {
 164                                struct udp_sock *up = udp_sk(sk);
 165                                if (up->pending == AF_INET6) {
 166                                        retv = -EBUSY;
 167                                        break;
 168                                }
 169                        } else if (sk->sk_protocol != IPPROTO_TCP)
 170                                break;
 171
 172                        if (sk->sk_state != TCP_ESTABLISHED) {
 173                                retv = -ENOTCONN;
 174                                break;
 175                        }
 176
 177                        if (ipv6_only_sock(sk) ||
 178                            !ipv6_addr_v4mapped(&np->daddr)) {
 179                                retv = -EADDRNOTAVAIL;
 180                                break;
 181                        }
 182
 183                        fl6_free_socklist(sk);
 184                        ipv6_sock_mc_close(sk);
 185
 186                        /*
 187                         * Sock is moving from IPv6 to IPv4 (sk_prot), so
 188                         * remove it from the refcnt debug socks count in the
 189                         * original family...
 190                         */
 191                        sk_refcnt_debug_dec(sk);
 192
 193                        if (sk->sk_protocol == IPPROTO_TCP) {
 194                                struct inet_connection_sock *icsk = inet_csk(sk);
 195                                local_bh_disable();
 196                                sock_prot_inuse_add(net, sk->sk_prot, -1);
 197                                sock_prot_inuse_add(net, &tcp_prot, 1);
 198                                local_bh_enable();
 199                                sk->sk_prot = &tcp_prot;
 200                                icsk->icsk_af_ops = &ipv4_specific;
 201                                sk->sk_socket->ops = &inet_stream_ops;
 202                                sk->sk_family = PF_INET;
 203                                tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 204                        } else {
 205                                struct proto *prot = &udp_prot;
 206
 207                                if (sk->sk_protocol == IPPROTO_UDPLITE)
 208                                        prot = &udplite_prot;
 209                                local_bh_disable();
 210                                sock_prot_inuse_add(net, sk->sk_prot, -1);
 211                                sock_prot_inuse_add(net, prot, 1);
 212                                local_bh_enable();
 213                                sk->sk_prot = prot;
 214                                sk->sk_socket->ops = &inet_dgram_ops;
 215                                sk->sk_family = PF_INET;
 216                        }
 217                        opt = xchg(&np->opt, NULL);
 218                        if (opt)
 219                                sock_kfree_s(sk, opt, opt->tot_len);
 220                        pktopt = xchg(&np->pktoptions, NULL);
 221                        if (pktopt)
 222                                kfree_skb(pktopt);
 223
 224                        sk->sk_destruct = inet_sock_destruct;
 225                        /*
 226                         * ... and add it to the refcnt debug socks count
 227                         * in the new family. -acme
 228                         */
 229                        sk_refcnt_debug_inc(sk);
 230                        module_put(THIS_MODULE);
 231                        retv = 0;
 232                        break;
 233                }
 234                goto e_inval;
 235
 236        case IPV6_V6ONLY:
 237                if (optlen < sizeof(int) ||
 238                    inet_sk(sk)->num)
 239                        goto e_inval;
 240                np->ipv6only = valbool;
 241                retv = 0;
 242                break;
 243
 244        case IPV6_RECVPKTINFO:
 245                if (optlen < sizeof(int))
 246                        goto e_inval;
 247                np->rxopt.bits.rxinfo = valbool;
 248                retv = 0;
 249                break;
 250
 251        case IPV6_2292PKTINFO:
 252                if (optlen < sizeof(int))
 253                        goto e_inval;
 254                np->rxopt.bits.rxoinfo = valbool;
 255                retv = 0;
 256                break;
 257
 258        case IPV6_RECVHOPLIMIT:
 259                if (optlen < sizeof(int))
 260                        goto e_inval;
 261                np->rxopt.bits.rxhlim = valbool;
 262                retv = 0;
 263                break;
 264
 265        case IPV6_2292HOPLIMIT:
 266                if (optlen < sizeof(int))
 267                        goto e_inval;
 268                np->rxopt.bits.rxohlim = valbool;
 269                retv = 0;
 270                break;
 271
 272        case IPV6_RECVRTHDR:
 273                if (optlen < sizeof(int))
 274                        goto e_inval;
 275                np->rxopt.bits.srcrt = valbool;
 276                retv = 0;
 277                break;
 278
 279        case IPV6_2292RTHDR:
 280                if (optlen < sizeof(int))
 281                        goto e_inval;
 282                np->rxopt.bits.osrcrt = valbool;
 283                retv = 0;
 284                break;
 285
 286        case IPV6_RECVHOPOPTS:
 287                if (optlen < sizeof(int))
 288                        goto e_inval;
 289                np->rxopt.bits.hopopts = valbool;
 290                retv = 0;
 291                break;
 292
 293        case IPV6_2292HOPOPTS:
 294                if (optlen < sizeof(int))
 295                        goto e_inval;
 296                np->rxopt.bits.ohopopts = valbool;
 297                retv = 0;
 298                break;
 299
 300        case IPV6_RECVDSTOPTS:
 301                if (optlen < sizeof(int))
 302                        goto e_inval;
 303                np->rxopt.bits.dstopts = valbool;
 304                retv = 0;
 305                break;
 306
 307        case IPV6_2292DSTOPTS:
 308                if (optlen < sizeof(int))
 309                        goto e_inval;
 310                np->rxopt.bits.odstopts = valbool;
 311                retv = 0;
 312                break;
 313
 314        case IPV6_TCLASS:
 315                if (optlen < sizeof(int))
 316                        goto e_inval;
 317                if (val < -1 || val > 0xff)
 318                        goto e_inval;
 319                np->tclass = val;
 320                retv = 0;
 321                break;
 322
 323        case IPV6_RECVTCLASS:
 324                if (optlen < sizeof(int))
 325                        goto e_inval;
 326                np->rxopt.bits.rxtclass = valbool;
 327                retv = 0;
 328                break;
 329
 330        case IPV6_FLOWINFO:
 331                if (optlen < sizeof(int))
 332                        goto e_inval;
 333                np->rxopt.bits.rxflow = valbool;
 334                retv = 0;
 335                break;
 336
 337        case IPV6_HOPOPTS:
 338        case IPV6_RTHDRDSTOPTS:
 339        case IPV6_RTHDR:
 340        case IPV6_DSTOPTS:
 341        {
 342                struct ipv6_txoptions *opt;
 343
 344                /* remove any sticky options header with a zero option
 345                 * length, per RFC3542.
 346                 */
 347                if (optlen == 0)
 348                        optval = NULL;
 349                else if (optval == NULL)
 350                        goto e_inval;
 351                else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 352                         optlen & 0x7 || optlen > 8 * 255)
 353                        goto e_inval;
 354
 355                /* hop-by-hop / destination options are privileged option */
 356                retv = -EPERM;
 357                if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 358                        break;
 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                retv = -EINVAL;
 370                if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 371                        struct ipv6_rt_hdr *rthdr = opt->srcrt;
 372                        switch (rthdr->type) {
 373#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 374                        case IPV6_SRCRT_TYPE_2:
 375                                if (rthdr->hdrlen != 2 ||
 376                                    rthdr->segments_left != 1)
 377                                        goto sticky_done;
 378
 379                                break;
 380#endif
 381                        default:
 382                                goto sticky_done;
 383                        }
 384
 385                        if ((rthdr->hdrlen & 1) ||
 386                            (rthdr->hdrlen >> 1) != rthdr->segments_left)
 387                                goto sticky_done;
 388                }
 389
 390                retv = 0;
 391                opt = ipv6_update_options(sk, opt);
 392sticky_done:
 393                if (opt)
 394                        sock_kfree_s(sk, opt, opt->tot_len);
 395                break;
 396        }
 397
 398        case IPV6_PKTINFO:
 399        {
 400                struct in6_pktinfo pkt;
 401
 402                if (optlen == 0)
 403                        goto e_inval;
 404                else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
 405                        goto e_inval;
 406
 407                if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 408                                retv = -EFAULT;
 409                                break;
 410                }
 411                if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 412                        goto e_inval;
 413
 414                np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 415                ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
 416                retv = 0;
 417                break;
 418        }
 419
 420        case IPV6_2292PKTOPTIONS:
 421        {
 422                struct ipv6_txoptions *opt = NULL;
 423                struct msghdr msg;
 424                struct flowi fl;
 425                int junk;
 426
 427                fl.fl6_flowlabel = 0;
 428                fl.oif = sk->sk_bound_dev_if;
 429
 430                if (optlen == 0)
 431                        goto update;
 432
 433                /* 1K is probably excessive
 434                 * 1K is surely not enough, 2K per standard header is 16K.
 435                 */
 436                retv = -EINVAL;
 437                if (optlen > 64*1024)
 438                        break;
 439
 440                opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 441                retv = -ENOBUFS;
 442                if (opt == NULL)
 443                        break;
 444
 445                memset(opt, 0, sizeof(*opt));
 446                opt->tot_len = sizeof(*opt) + optlen;
 447                retv = -EFAULT;
 448                if (copy_from_user(opt+1, optval, optlen))
 449                        goto done;
 450
 451                msg.msg_controllen = optlen;
 452                msg.msg_control = (void*)(opt+1);
 453
 454                retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
 455                if (retv)
 456                        goto done;
 457update:
 458                retv = 0;
 459                opt = ipv6_update_options(sk, opt);
 460done:
 461                if (opt)
 462                        sock_kfree_s(sk, opt, opt->tot_len);
 463                break;
 464        }
 465        case IPV6_UNICAST_HOPS:
 466                if (optlen < sizeof(int))
 467                        goto e_inval;
 468                if (val > 255 || val < -1)
 469                        goto e_inval;
 470                np->hop_limit = val;
 471                retv = 0;
 472                break;
 473
 474        case IPV6_MULTICAST_HOPS:
 475                if (sk->sk_type == SOCK_STREAM)
 476                        break;
 477                if (optlen < sizeof(int))
 478                        goto e_inval;
 479                if (val > 255 || val < -1)
 480                        goto e_inval;
 481                np->mcast_hops = val;
 482                retv = 0;
 483                break;
 484
 485        case IPV6_MULTICAST_LOOP:
 486                if (optlen < sizeof(int))
 487                        goto e_inval;
 488                if (val != valbool)
 489                        goto e_inval;
 490                np->mc_loop = valbool;
 491                retv = 0;
 492                break;
 493
 494        case IPV6_MULTICAST_IF:
 495                if (sk->sk_type == SOCK_STREAM)
 496                        break;
 497                if (optlen < sizeof(int))
 498                        goto e_inval;
 499
 500                if (val) {
 501                        if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 502                                goto e_inval;
 503
 504                        if (__dev_get_by_index(net, val) == NULL) {
 505                                retv = -ENODEV;
 506                                break;
 507                        }
 508                }
 509                np->mcast_oif = val;
 510                retv = 0;
 511                break;
 512        case IPV6_ADD_MEMBERSHIP:
 513        case IPV6_DROP_MEMBERSHIP:
 514        {
 515                struct ipv6_mreq mreq;
 516
 517                if (optlen < sizeof(struct ipv6_mreq))
 518                        goto e_inval;
 519
 520                retv = -EPROTO;
 521                if (inet_sk(sk)->is_icsk)
 522                        break;
 523
 524                retv = -EFAULT;
 525                if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 526                        break;
 527
 528                if (optname == IPV6_ADD_MEMBERSHIP)
 529                        retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 530                else
 531                        retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 532                break;
 533        }
 534        case IPV6_JOIN_ANYCAST:
 535        case IPV6_LEAVE_ANYCAST:
 536        {
 537                struct ipv6_mreq mreq;
 538
 539                if (optlen < sizeof(struct ipv6_mreq))
 540                        goto e_inval;
 541
 542                retv = -EFAULT;
 543                if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 544                        break;
 545
 546                if (optname == IPV6_JOIN_ANYCAST)
 547                        retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 548                else
 549                        retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 550                break;
 551        }
 552        case MCAST_JOIN_GROUP:
 553        case MCAST_LEAVE_GROUP:
 554        {
 555                struct group_req greq;
 556                struct sockaddr_in6 *psin6;
 557
 558                if (optlen < sizeof(struct group_req))
 559                        goto e_inval;
 560
 561                retv = -EFAULT;
 562                if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 563                        break;
 564                if (greq.gr_group.ss_family != AF_INET6) {
 565                        retv = -EADDRNOTAVAIL;
 566                        break;
 567                }
 568                psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 569                if (optname == MCAST_JOIN_GROUP)
 570                        retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 571                                &psin6->sin6_addr);
 572                else
 573                        retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 574                                &psin6->sin6_addr);
 575                break;
 576        }
 577        case MCAST_JOIN_SOURCE_GROUP:
 578        case MCAST_LEAVE_SOURCE_GROUP:
 579        case MCAST_BLOCK_SOURCE:
 580        case MCAST_UNBLOCK_SOURCE:
 581        {
 582                struct group_source_req greqs;
 583                int omode, add;
 584
 585                if (optlen < sizeof(struct group_source_req))
 586                        goto e_inval;
 587                if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 588                        retv = -EFAULT;
 589                        break;
 590                }
 591                if (greqs.gsr_group.ss_family != AF_INET6 ||
 592                    greqs.gsr_source.ss_family != AF_INET6) {
 593                        retv = -EADDRNOTAVAIL;
 594                        break;
 595                }
 596                if (optname == MCAST_BLOCK_SOURCE) {
 597                        omode = MCAST_EXCLUDE;
 598                        add = 1;
 599                } else if (optname == MCAST_UNBLOCK_SOURCE) {
 600                        omode = MCAST_EXCLUDE;
 601                        add = 0;
 602                } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 603                        struct sockaddr_in6 *psin6;
 604
 605                        psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 606                        retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 607                                &psin6->sin6_addr);
 608                        /* prior join w/ different source is ok */
 609                        if (retv && retv != -EADDRINUSE)
 610                                break;
 611                        omode = MCAST_INCLUDE;
 612                        add = 1;
 613                } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 614                        omode = MCAST_INCLUDE;
 615                        add = 0;
 616                }
 617                retv = ip6_mc_source(add, omode, sk, &greqs);
 618                break;
 619        }
 620        case MCAST_MSFILTER:
 621        {
 622                extern int sysctl_mld_max_msf;
 623                struct group_filter *gsf;
 624
 625                if (optlen < GROUP_FILTER_SIZE(0))
 626                        goto e_inval;
 627                if (optlen > sysctl_optmem_max) {
 628                        retv = -ENOBUFS;
 629                        break;
 630                }
 631                gsf = kmalloc(optlen,GFP_KERNEL);
 632                if (!gsf) {
 633                        retv = -ENOBUFS;
 634                        break;
 635                }
 636                retv = -EFAULT;
 637                if (copy_from_user(gsf, optval, optlen)) {
 638                        kfree(gsf);
 639                        break;
 640                }
 641                /* numsrc >= (4G-140)/128 overflow in 32 bits */
 642                if (gsf->gf_numsrc >= 0x1ffffffU ||
 643                    gsf->gf_numsrc > sysctl_mld_max_msf) {
 644                        kfree(gsf);
 645                        retv = -ENOBUFS;
 646                        break;
 647                }
 648                if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 649                        kfree(gsf);
 650                        retv = -EINVAL;
 651                        break;
 652                }
 653                retv = ip6_mc_msfilter(sk, gsf);
 654                kfree(gsf);
 655
 656                break;
 657        }
 658        case IPV6_ROUTER_ALERT:
 659                if (optlen < sizeof(int))
 660                        goto e_inval;
 661                retv = ip6_ra_control(sk, val);
 662                break;
 663        case IPV6_MTU_DISCOVER:
 664                if (optlen < sizeof(int))
 665                        goto e_inval;
 666                if (val<0 || val>3)
 667                        goto e_inval;
 668                np->pmtudisc = val;
 669                retv = 0;
 670                break;
 671        case IPV6_MTU:
 672                if (optlen < sizeof(int))
 673                        goto e_inval;
 674                if (val && val < IPV6_MIN_MTU)
 675                        goto e_inval;
 676                np->frag_size = val;
 677                retv = 0;
 678                break;
 679        case IPV6_RECVERR:
 680                if (optlen < sizeof(int))
 681                        goto e_inval;
 682                np->recverr = valbool;
 683                if (!val)
 684                        skb_queue_purge(&sk->sk_error_queue);
 685                retv = 0;
 686                break;
 687        case IPV6_FLOWINFO_SEND:
 688                if (optlen < sizeof(int))
 689                        goto e_inval;
 690                np->sndflow = valbool;
 691                retv = 0;
 692                break;
 693        case IPV6_FLOWLABEL_MGR:
 694                retv = ipv6_flowlabel_opt(sk, optval, optlen);
 695                break;
 696        case IPV6_IPSEC_POLICY:
 697        case IPV6_XFRM_POLICY:
 698                retv = -EPERM;
 699                if (!capable(CAP_NET_ADMIN))
 700                        break;
 701                retv = xfrm_user_policy(sk, optname, optval, optlen);
 702                break;
 703
 704        case IPV6_ADDR_PREFERENCES:
 705            {
 706                unsigned int pref = 0;
 707                unsigned int prefmask = ~0;
 708
 709                if (optlen < sizeof(int))
 710                        goto e_inval;
 711
 712                retv = -EINVAL;
 713
 714                /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 715                switch (val & (IPV6_PREFER_SRC_PUBLIC|
 716                               IPV6_PREFER_SRC_TMP|
 717                               IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 718                case IPV6_PREFER_SRC_PUBLIC:
 719                        pref |= IPV6_PREFER_SRC_PUBLIC;
 720                        break;
 721                case IPV6_PREFER_SRC_TMP:
 722                        pref |= IPV6_PREFER_SRC_TMP;
 723                        break;
 724                case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 725                        break;
 726                case 0:
 727                        goto pref_skip_pubtmp;
 728                default:
 729                        goto e_inval;
 730                }
 731
 732                prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 733                              IPV6_PREFER_SRC_TMP);
 734pref_skip_pubtmp:
 735
 736                /* check HOME/COA conflicts */
 737                switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 738                case IPV6_PREFER_SRC_HOME:
 739                        break;
 740                case IPV6_PREFER_SRC_COA:
 741                        pref |= IPV6_PREFER_SRC_COA;
 742                case 0:
 743                        goto pref_skip_coa;
 744                default:
 745                        goto e_inval;
 746                }
 747
 748                prefmask &= ~IPV6_PREFER_SRC_COA;
 749pref_skip_coa:
 750
 751                /* check CGA/NONCGA conflicts */
 752                switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 753                case IPV6_PREFER_SRC_CGA:
 754                case IPV6_PREFER_SRC_NONCGA:
 755                case 0:
 756                        break;
 757                default:
 758                        goto e_inval;
 759                }
 760
 761                np->srcprefs = (np->srcprefs & prefmask) | pref;
 762                retv = 0;
 763
 764                break;
 765            }
 766        }
 767
 768        release_sock(sk);
 769
 770        return retv;
 771
 772e_inval:
 773        release_sock(sk);
 774        return -EINVAL;
 775}
 776
 777int ipv6_setsockopt(struct sock *sk, int level, int optname,
 778                    char __user *optval, int optlen)
 779{
 780        int err;
 781
 782        if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 783                return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 784
 785        if (level != SOL_IPV6)
 786                return -ENOPROTOOPT;
 787
 788        err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 789#ifdef CONFIG_NETFILTER
 790        /* we need to exclude all possible ENOPROTOOPTs except default case */
 791        if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 792                        optname != IPV6_XFRM_POLICY) {
 793                lock_sock(sk);
 794                err = nf_setsockopt(sk, PF_INET6, optname, optval,
 795                                optlen);
 796                release_sock(sk);
 797        }
 798#endif
 799        return err;
 800}
 801
 802EXPORT_SYMBOL(ipv6_setsockopt);
 803
 804#ifdef CONFIG_COMPAT
 805int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 806                           char __user *optval, int optlen)
 807{
 808        int err;
 809
 810        if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 811                if (udp_prot.compat_setsockopt != NULL)
 812                        return udp_prot.compat_setsockopt(sk, level, optname,
 813                                                          optval, optlen);
 814                return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 815        }
 816
 817        if (level != SOL_IPV6)
 818                return -ENOPROTOOPT;
 819
 820        if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 821                return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 822                        ipv6_setsockopt);
 823
 824        err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 825#ifdef CONFIG_NETFILTER
 826        /* we need to exclude all possible ENOPROTOOPTs except default case */
 827        if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 828            optname != IPV6_XFRM_POLICY) {
 829                lock_sock(sk);
 830                err = compat_nf_setsockopt(sk, PF_INET6, optname,
 831                                           optval, optlen);
 832                release_sock(sk);
 833        }
 834#endif
 835        return err;
 836}
 837
 838EXPORT_SYMBOL(compat_ipv6_setsockopt);
 839#endif
 840
 841static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 842                                  int optname, char __user *optval, int len)
 843{
 844        struct ipv6_opt_hdr *hdr;
 845
 846        if (!opt)
 847                return 0;
 848
 849        switch(optname) {
 850        case IPV6_HOPOPTS:
 851                hdr = opt->hopopt;
 852                break;
 853        case IPV6_RTHDRDSTOPTS:
 854                hdr = opt->dst0opt;
 855                break;
 856        case IPV6_RTHDR:
 857                hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 858                break;
 859        case IPV6_DSTOPTS:
 860                hdr = opt->dst1opt;
 861                break;
 862        default:
 863                return -EINVAL; /* should not happen */
 864        }
 865
 866        if (!hdr)
 867                return 0;
 868
 869        len = min_t(unsigned int, len, ipv6_optlen(hdr));
 870        if (copy_to_user(optval, hdr, len))
 871                return -EFAULT;
 872        return len;
 873}
 874
 875static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 876                    char __user *optval, int __user *optlen)
 877{
 878        struct ipv6_pinfo *np = inet6_sk(sk);
 879        int len;
 880        int val;
 881
 882        if (ip6_mroute_opt(optname))
 883                return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 884
 885        if (get_user(len, optlen))
 886                return -EFAULT;
 887        switch (optname) {
 888        case IPV6_ADDRFORM:
 889                if (sk->sk_protocol != IPPROTO_UDP &&
 890                    sk->sk_protocol != IPPROTO_UDPLITE &&
 891                    sk->sk_protocol != IPPROTO_TCP)
 892                        return -ENOPROTOOPT;
 893                if (sk->sk_state != TCP_ESTABLISHED)
 894                        return -ENOTCONN;
 895                val = sk->sk_family;
 896                break;
 897        case MCAST_MSFILTER:
 898        {
 899                struct group_filter gsf;
 900                int err;
 901
 902                if (len < GROUP_FILTER_SIZE(0))
 903                        return -EINVAL;
 904                if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 905                        return -EFAULT;
 906                if (gsf.gf_group.ss_family != AF_INET6)
 907                        return -EADDRNOTAVAIL;
 908                lock_sock(sk);
 909                err = ip6_mc_msfget(sk, &gsf,
 910                        (struct group_filter __user *)optval, optlen);
 911                release_sock(sk);
 912                return err;
 913        }
 914
 915        case IPV6_2292PKTOPTIONS:
 916        {
 917                struct msghdr msg;
 918                struct sk_buff *skb;
 919
 920                if (sk->sk_type != SOCK_STREAM)
 921                        return -ENOPROTOOPT;
 922
 923                msg.msg_control = optval;
 924                msg.msg_controllen = len;
 925                msg.msg_flags = 0;
 926
 927                lock_sock(sk);
 928                skb = np->pktoptions;
 929                if (skb)
 930                        atomic_inc(&skb->users);
 931                release_sock(sk);
 932
 933                if (skb) {
 934                        int err = datagram_recv_ctl(sk, &msg, skb);
 935                        kfree_skb(skb);
 936                        if (err)
 937                                return err;
 938                } else {
 939                        if (np->rxopt.bits.rxinfo) {
 940                                struct in6_pktinfo src_info;
 941                                src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 942                                        np->sticky_pktinfo.ipi6_ifindex;
 943                                np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 944                                        ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 945                                put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 946                        }
 947                        if (np->rxopt.bits.rxhlim) {
 948                                int hlim = np->mcast_hops;
 949                                put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 950                        }
 951                        if (np->rxopt.bits.rxoinfo) {
 952                                struct in6_pktinfo src_info;
 953                                src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 954                                        np->sticky_pktinfo.ipi6_ifindex;
 955                                np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 956                                        ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 957                                put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 958                        }
 959                        if (np->rxopt.bits.rxohlim) {
 960                                int hlim = np->mcast_hops;
 961                                put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 962                        }
 963                }
 964                len -= msg.msg_controllen;
 965                return put_user(len, optlen);
 966        }
 967        case IPV6_MTU:
 968        {
 969                struct dst_entry *dst;
 970                val = 0;
 971                lock_sock(sk);
 972                dst = sk_dst_get(sk);
 973                if (dst) {
 974                        val = dst_mtu(dst);
 975                        dst_release(dst);
 976                }
 977                release_sock(sk);
 978                if (!val)
 979                        return -ENOTCONN;
 980                break;
 981        }
 982
 983        case IPV6_V6ONLY:
 984                val = np->ipv6only;
 985                break;
 986
 987        case IPV6_RECVPKTINFO:
 988                val = np->rxopt.bits.rxinfo;
 989                break;
 990
 991        case IPV6_2292PKTINFO:
 992                val = np->rxopt.bits.rxoinfo;
 993                break;
 994
 995        case IPV6_RECVHOPLIMIT:
 996                val = np->rxopt.bits.rxhlim;
 997                break;
 998
 999        case IPV6_2292HOPLIMIT:
1000                val = np->rxopt.bits.rxohlim;
1001                break;
1002
1003        case IPV6_RECVRTHDR:
1004                val = np->rxopt.bits.srcrt;
1005                break;
1006
1007        case IPV6_2292RTHDR:
1008                val = np->rxopt.bits.osrcrt;
1009                break;
1010
1011        case IPV6_HOPOPTS:
1012        case IPV6_RTHDRDSTOPTS:
1013        case IPV6_RTHDR:
1014        case IPV6_DSTOPTS:
1015        {
1016
1017                lock_sock(sk);
1018                len = ipv6_getsockopt_sticky(sk, np->opt,
1019                                             optname, optval, len);
1020                release_sock(sk);
1021                /* check if ipv6_getsockopt_sticky() returns err code */
1022                if (len < 0)
1023                        return len;
1024                return put_user(len, optlen);
1025        }
1026
1027        case IPV6_RECVHOPOPTS:
1028                val = np->rxopt.bits.hopopts;
1029                break;
1030
1031        case IPV6_2292HOPOPTS:
1032                val = np->rxopt.bits.ohopopts;
1033                break;
1034
1035        case IPV6_RECVDSTOPTS:
1036                val = np->rxopt.bits.dstopts;
1037                break;
1038
1039        case IPV6_2292DSTOPTS:
1040                val = np->rxopt.bits.odstopts;
1041                break;
1042
1043        case IPV6_TCLASS:
1044                val = np->tclass;
1045                if (val < 0)
1046                        val = 0;
1047                break;
1048
1049        case IPV6_RECVTCLASS:
1050                val = np->rxopt.bits.rxtclass;
1051                break;
1052
1053        case IPV6_FLOWINFO:
1054                val = np->rxopt.bits.rxflow;
1055                break;
1056
1057        case IPV6_UNICAST_HOPS:
1058        case IPV6_MULTICAST_HOPS:
1059        {
1060                struct dst_entry *dst;
1061
1062                if (optname == IPV6_UNICAST_HOPS)
1063                        val = np->hop_limit;
1064                else
1065                        val = np->mcast_hops;
1066
1067                dst = sk_dst_get(sk);
1068                if (dst) {
1069                        if (val < 0)
1070                                val = ip6_dst_hoplimit(dst);
1071                        dst_release(dst);
1072                }
1073                if (val < 0)
1074                        val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1075                break;
1076        }
1077
1078        case IPV6_MULTICAST_LOOP:
1079                val = np->mc_loop;
1080                break;
1081
1082        case IPV6_MULTICAST_IF:
1083                val = np->mcast_oif;
1084                break;
1085
1086        case IPV6_MTU_DISCOVER:
1087                val = np->pmtudisc;
1088                break;
1089
1090        case IPV6_RECVERR:
1091                val = np->recverr;
1092                break;
1093
1094        case IPV6_FLOWINFO_SEND:
1095                val = np->sndflow;
1096                break;
1097
1098        case IPV6_ADDR_PREFERENCES:
1099                val = 0;
1100
1101                if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1102                        val |= IPV6_PREFER_SRC_TMP;
1103                else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1104                        val |= IPV6_PREFER_SRC_PUBLIC;
1105                else {
1106                        /* XXX: should we return system default? */
1107                        val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1108                }
1109
1110                if (np->srcprefs & IPV6_PREFER_SRC_COA)
1111                        val |= IPV6_PREFER_SRC_COA;
1112                else
1113                        val |= IPV6_PREFER_SRC_HOME;
1114                break;
1115
1116        default:
1117                return -ENOPROTOOPT;
1118        }
1119        len = min_t(unsigned int, sizeof(int), len);
1120        if(put_user(len, optlen))
1121                return -EFAULT;
1122        if(copy_to_user(optval,&val,len))
1123                return -EFAULT;
1124        return 0;
1125}
1126
1127int ipv6_getsockopt(struct sock *sk, int level, int optname,
1128                    char __user *optval, int __user *optlen)
1129{
1130        int err;
1131
1132        if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1133                return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1134
1135        if(level != SOL_IPV6)
1136                return -ENOPROTOOPT;
1137
1138        err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1139#ifdef CONFIG_NETFILTER
1140        /* we need to exclude all possible ENOPROTOOPTs except default case */
1141        if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1142                int len;
1143
1144                if (get_user(len, optlen))
1145                        return -EFAULT;
1146
1147                lock_sock(sk);
1148                err = nf_getsockopt(sk, PF_INET6, optname, optval,
1149                                &len);
1150                release_sock(sk);
1151                if (err >= 0)
1152                        err = put_user(len, optlen);
1153        }
1154#endif
1155        return err;
1156}
1157
1158EXPORT_SYMBOL(ipv6_getsockopt);
1159
1160#ifdef CONFIG_COMPAT
1161int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1162                           char __user *optval, int __user *optlen)
1163{
1164        int err;
1165
1166        if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1167                if (udp_prot.compat_getsockopt != NULL)
1168                        return udp_prot.compat_getsockopt(sk, level, optname,
1169                                                          optval, optlen);
1170                return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1171        }
1172
1173        if (level != SOL_IPV6)
1174                return -ENOPROTOOPT;
1175
1176        if (optname == MCAST_MSFILTER)
1177                return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1178                        ipv6_getsockopt);
1179
1180        err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1181#ifdef CONFIG_NETFILTER
1182        /* we need to exclude all possible ENOPROTOOPTs except default case */
1183        if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1184                int len;
1185
1186                if (get_user(len, optlen))
1187                        return -EFAULT;
1188
1189                lock_sock(sk);
1190                err = compat_nf_getsockopt(sk, PF_INET6,
1191                                           optname, optval, &len);
1192                release_sock(sk);
1193                if (err >= 0)
1194                        err = put_user(len, optlen);
1195        }
1196#endif
1197        return err;
1198}
1199
1200EXPORT_SYMBOL(compat_ipv6_getsockopt);
1201#endif
1202
1203