linux/net/ipv6/ipv6_sockglue.c
<<
>>
Prefs
   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                        kfree_skb(pktopt);
 222
 223                        sk->sk_destruct = inet_sock_destruct;
 224                        /*
 225                         * ... and add it to the refcnt debug socks count
 226                         * in the new family. -acme
 227                         */
 228                        sk_refcnt_debug_inc(sk);
 229                        module_put(THIS_MODULE);
 230                        retv = 0;
 231                        break;
 232                }
 233                goto e_inval;
 234
 235        case IPV6_V6ONLY:
 236                if (optlen < sizeof(int) ||
 237                    inet_sk(sk)->num)
 238                        goto e_inval;
 239                np->ipv6only = valbool;
 240                retv = 0;
 241                break;
 242
 243        case IPV6_RECVPKTINFO:
 244                if (optlen < sizeof(int))
 245                        goto e_inval;
 246                np->rxopt.bits.rxinfo = valbool;
 247                retv = 0;
 248                break;
 249
 250        case IPV6_2292PKTINFO:
 251                if (optlen < sizeof(int))
 252                        goto e_inval;
 253                np->rxopt.bits.rxoinfo = valbool;
 254                retv = 0;
 255                break;
 256
 257        case IPV6_RECVHOPLIMIT:
 258                if (optlen < sizeof(int))
 259                        goto e_inval;
 260                np->rxopt.bits.rxhlim = valbool;
 261                retv = 0;
 262                break;
 263
 264        case IPV6_2292HOPLIMIT:
 265                if (optlen < sizeof(int))
 266                        goto e_inval;
 267                np->rxopt.bits.rxohlim = valbool;
 268                retv = 0;
 269                break;
 270
 271        case IPV6_RECVRTHDR:
 272                if (optlen < sizeof(int))
 273                        goto e_inval;
 274                np->rxopt.bits.srcrt = valbool;
 275                retv = 0;
 276                break;
 277
 278        case IPV6_2292RTHDR:
 279                if (optlen < sizeof(int))
 280                        goto e_inval;
 281                np->rxopt.bits.osrcrt = valbool;
 282                retv = 0;
 283                break;
 284
 285        case IPV6_RECVHOPOPTS:
 286                if (optlen < sizeof(int))
 287                        goto e_inval;
 288                np->rxopt.bits.hopopts = valbool;
 289                retv = 0;
 290                break;
 291
 292        case IPV6_2292HOPOPTS:
 293                if (optlen < sizeof(int))
 294                        goto e_inval;
 295                np->rxopt.bits.ohopopts = valbool;
 296                retv = 0;
 297                break;
 298
 299        case IPV6_RECVDSTOPTS:
 300                if (optlen < sizeof(int))
 301                        goto e_inval;
 302                np->rxopt.bits.dstopts = valbool;
 303                retv = 0;
 304                break;
 305
 306        case IPV6_2292DSTOPTS:
 307                if (optlen < sizeof(int))
 308                        goto e_inval;
 309                np->rxopt.bits.odstopts = valbool;
 310                retv = 0;
 311                break;
 312
 313        case IPV6_TCLASS:
 314                if (optlen < sizeof(int))
 315                        goto e_inval;
 316                if (val < -1 || val > 0xff)
 317                        goto e_inval;
 318                np->tclass = val;
 319                retv = 0;
 320                break;
 321
 322        case IPV6_RECVTCLASS:
 323                if (optlen < sizeof(int))
 324                        goto e_inval;
 325                np->rxopt.bits.rxtclass = valbool;
 326                retv = 0;
 327                break;
 328
 329        case IPV6_FLOWINFO:
 330                if (optlen < sizeof(int))
 331                        goto e_inval;
 332                np->rxopt.bits.rxflow = valbool;
 333                retv = 0;
 334                break;
 335
 336        case IPV6_HOPOPTS:
 337        case IPV6_RTHDRDSTOPTS:
 338        case IPV6_RTHDR:
 339        case IPV6_DSTOPTS:
 340        {
 341                struct ipv6_txoptions *opt;
 342
 343                /* remove any sticky options header with a zero option
 344                 * length, per RFC3542.
 345                 */
 346                if (optlen == 0)
 347                        optval = NULL;
 348                else if (optval == NULL)
 349                        goto e_inval;
 350                else if (optlen < sizeof(struct ipv6_opt_hdr) ||
 351                         optlen & 0x7 || optlen > 8 * 255)
 352                        goto e_inval;
 353
 354                /* hop-by-hop / destination options are privileged option */
 355                retv = -EPERM;
 356                if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
 357                        break;
 358
 359                opt = ipv6_renew_options(sk, np->opt, optname,
 360                                         (struct ipv6_opt_hdr __user *)optval,
 361                                         optlen);
 362                if (IS_ERR(opt)) {
 363                        retv = PTR_ERR(opt);
 364                        break;
 365                }
 366
 367                /* routing header option needs extra check */
 368                retv = -EINVAL;
 369                if (optname == IPV6_RTHDR && opt && opt->srcrt) {
 370                        struct ipv6_rt_hdr *rthdr = opt->srcrt;
 371                        switch (rthdr->type) {
 372#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 373                        case IPV6_SRCRT_TYPE_2:
 374                                if (rthdr->hdrlen != 2 ||
 375                                    rthdr->segments_left != 1)
 376                                        goto sticky_done;
 377
 378                                break;
 379#endif
 380                        default:
 381                                goto sticky_done;
 382                        }
 383                }
 384
 385                retv = 0;
 386                opt = ipv6_update_options(sk, opt);
 387sticky_done:
 388                if (opt)
 389                        sock_kfree_s(sk, opt, opt->tot_len);
 390                break;
 391        }
 392
 393        case IPV6_PKTINFO:
 394        {
 395                struct in6_pktinfo pkt;
 396
 397                if (optlen == 0)
 398                        goto e_inval;
 399                else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
 400                        goto e_inval;
 401
 402                if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
 403                                retv = -EFAULT;
 404                                break;
 405                }
 406                if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
 407                        goto e_inval;
 408
 409                np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
 410                ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
 411                retv = 0;
 412                break;
 413        }
 414
 415        case IPV6_2292PKTOPTIONS:
 416        {
 417                struct ipv6_txoptions *opt = NULL;
 418                struct msghdr msg;
 419                struct flowi fl;
 420                int junk;
 421
 422                fl.fl6_flowlabel = 0;
 423                fl.oif = sk->sk_bound_dev_if;
 424
 425                if (optlen == 0)
 426                        goto update;
 427
 428                /* 1K is probably excessive
 429                 * 1K is surely not enough, 2K per standard header is 16K.
 430                 */
 431                retv = -EINVAL;
 432                if (optlen > 64*1024)
 433                        break;
 434
 435                opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 436                retv = -ENOBUFS;
 437                if (opt == NULL)
 438                        break;
 439
 440                memset(opt, 0, sizeof(*opt));
 441                opt->tot_len = sizeof(*opt) + optlen;
 442                retv = -EFAULT;
 443                if (copy_from_user(opt+1, optval, optlen))
 444                        goto done;
 445
 446                msg.msg_controllen = optlen;
 447                msg.msg_control = (void*)(opt+1);
 448
 449                retv = datagram_send_ctl(net, &msg, &fl, opt, &junk, &junk);
 450                if (retv)
 451                        goto done;
 452update:
 453                retv = 0;
 454                opt = ipv6_update_options(sk, opt);
 455done:
 456                if (opt)
 457                        sock_kfree_s(sk, opt, opt->tot_len);
 458                break;
 459        }
 460        case IPV6_UNICAST_HOPS:
 461                if (optlen < sizeof(int))
 462                        goto e_inval;
 463                if (val > 255 || val < -1)
 464                        goto e_inval;
 465                np->hop_limit = val;
 466                retv = 0;
 467                break;
 468
 469        case IPV6_MULTICAST_HOPS:
 470                if (sk->sk_type == SOCK_STREAM)
 471                        break;
 472                if (optlen < sizeof(int))
 473                        goto e_inval;
 474                if (val > 255 || val < -1)
 475                        goto e_inval;
 476                np->mcast_hops = val;
 477                retv = 0;
 478                break;
 479
 480        case IPV6_MULTICAST_LOOP:
 481                if (optlen < sizeof(int))
 482                        goto e_inval;
 483                if (val != valbool)
 484                        goto e_inval;
 485                np->mc_loop = valbool;
 486                retv = 0;
 487                break;
 488
 489        case IPV6_MULTICAST_IF:
 490                if (sk->sk_type == SOCK_STREAM)
 491                        break;
 492                if (optlen < sizeof(int))
 493                        goto e_inval;
 494
 495                if (val) {
 496                        if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
 497                                goto e_inval;
 498
 499                        if (__dev_get_by_index(net, val) == NULL) {
 500                                retv = -ENODEV;
 501                                break;
 502                        }
 503                }
 504                np->mcast_oif = val;
 505                retv = 0;
 506                break;
 507        case IPV6_ADD_MEMBERSHIP:
 508        case IPV6_DROP_MEMBERSHIP:
 509        {
 510                struct ipv6_mreq mreq;
 511
 512                if (optlen < sizeof(struct ipv6_mreq))
 513                        goto e_inval;
 514
 515                retv = -EPROTO;
 516                if (inet_sk(sk)->is_icsk)
 517                        break;
 518
 519                retv = -EFAULT;
 520                if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 521                        break;
 522
 523                if (optname == IPV6_ADD_MEMBERSHIP)
 524                        retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 525                else
 526                        retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 527                break;
 528        }
 529        case IPV6_JOIN_ANYCAST:
 530        case IPV6_LEAVE_ANYCAST:
 531        {
 532                struct ipv6_mreq mreq;
 533
 534                if (optlen < sizeof(struct ipv6_mreq))
 535                        goto e_inval;
 536
 537                retv = -EFAULT;
 538                if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 539                        break;
 540
 541                if (optname == IPV6_JOIN_ANYCAST)
 542                        retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 543                else
 544                        retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
 545                break;
 546        }
 547        case MCAST_JOIN_GROUP:
 548        case MCAST_LEAVE_GROUP:
 549        {
 550                struct group_req greq;
 551                struct sockaddr_in6 *psin6;
 552
 553                if (optlen < sizeof(struct group_req))
 554                        goto e_inval;
 555
 556                retv = -EFAULT;
 557                if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 558                        break;
 559                if (greq.gr_group.ss_family != AF_INET6) {
 560                        retv = -EADDRNOTAVAIL;
 561                        break;
 562                }
 563                psin6 = (struct sockaddr_in6 *)&greq.gr_group;
 564                if (optname == MCAST_JOIN_GROUP)
 565                        retv = ipv6_sock_mc_join(sk, greq.gr_interface,
 566                                &psin6->sin6_addr);
 567                else
 568                        retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
 569                                &psin6->sin6_addr);
 570                break;
 571        }
 572        case MCAST_JOIN_SOURCE_GROUP:
 573        case MCAST_LEAVE_SOURCE_GROUP:
 574        case MCAST_BLOCK_SOURCE:
 575        case MCAST_UNBLOCK_SOURCE:
 576        {
 577                struct group_source_req greqs;
 578                int omode, add;
 579
 580                if (optlen < sizeof(struct group_source_req))
 581                        goto e_inval;
 582                if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 583                        retv = -EFAULT;
 584                        break;
 585                }
 586                if (greqs.gsr_group.ss_family != AF_INET6 ||
 587                    greqs.gsr_source.ss_family != AF_INET6) {
 588                        retv = -EADDRNOTAVAIL;
 589                        break;
 590                }
 591                if (optname == MCAST_BLOCK_SOURCE) {
 592                        omode = MCAST_EXCLUDE;
 593                        add = 1;
 594                } else if (optname == MCAST_UNBLOCK_SOURCE) {
 595                        omode = MCAST_EXCLUDE;
 596                        add = 0;
 597                } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
 598                        struct sockaddr_in6 *psin6;
 599
 600                        psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
 601                        retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
 602                                &psin6->sin6_addr);
 603                        /* prior join w/ different source is ok */
 604                        if (retv && retv != -EADDRINUSE)
 605                                break;
 606                        omode = MCAST_INCLUDE;
 607                        add = 1;
 608                } else /* MCAST_LEAVE_SOURCE_GROUP */ {
 609                        omode = MCAST_INCLUDE;
 610                        add = 0;
 611                }
 612                retv = ip6_mc_source(add, omode, sk, &greqs);
 613                break;
 614        }
 615        case MCAST_MSFILTER:
 616        {
 617                extern int sysctl_mld_max_msf;
 618                struct group_filter *gsf;
 619
 620                if (optlen < GROUP_FILTER_SIZE(0))
 621                        goto e_inval;
 622                if (optlen > sysctl_optmem_max) {
 623                        retv = -ENOBUFS;
 624                        break;
 625                }
 626                gsf = kmalloc(optlen,GFP_KERNEL);
 627                if (!gsf) {
 628                        retv = -ENOBUFS;
 629                        break;
 630                }
 631                retv = -EFAULT;
 632                if (copy_from_user(gsf, optval, optlen)) {
 633                        kfree(gsf);
 634                        break;
 635                }
 636                /* numsrc >= (4G-140)/128 overflow in 32 bits */
 637                if (gsf->gf_numsrc >= 0x1ffffffU ||
 638                    gsf->gf_numsrc > sysctl_mld_max_msf) {
 639                        kfree(gsf);
 640                        retv = -ENOBUFS;
 641                        break;
 642                }
 643                if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
 644                        kfree(gsf);
 645                        retv = -EINVAL;
 646                        break;
 647                }
 648                retv = ip6_mc_msfilter(sk, gsf);
 649                kfree(gsf);
 650
 651                break;
 652        }
 653        case IPV6_ROUTER_ALERT:
 654                if (optlen < sizeof(int))
 655                        goto e_inval;
 656                retv = ip6_ra_control(sk, val);
 657                break;
 658        case IPV6_MTU_DISCOVER:
 659                if (optlen < sizeof(int))
 660                        goto e_inval;
 661                if (val<0 || val>3)
 662                        goto e_inval;
 663                np->pmtudisc = val;
 664                retv = 0;
 665                break;
 666        case IPV6_MTU:
 667                if (optlen < sizeof(int))
 668                        goto e_inval;
 669                if (val && val < IPV6_MIN_MTU)
 670                        goto e_inval;
 671                np->frag_size = val;
 672                retv = 0;
 673                break;
 674        case IPV6_RECVERR:
 675                if (optlen < sizeof(int))
 676                        goto e_inval;
 677                np->recverr = valbool;
 678                if (!val)
 679                        skb_queue_purge(&sk->sk_error_queue);
 680                retv = 0;
 681                break;
 682        case IPV6_FLOWINFO_SEND:
 683                if (optlen < sizeof(int))
 684                        goto e_inval;
 685                np->sndflow = valbool;
 686                retv = 0;
 687                break;
 688        case IPV6_FLOWLABEL_MGR:
 689                retv = ipv6_flowlabel_opt(sk, optval, optlen);
 690                break;
 691        case IPV6_IPSEC_POLICY:
 692        case IPV6_XFRM_POLICY:
 693                retv = -EPERM;
 694                if (!capable(CAP_NET_ADMIN))
 695                        break;
 696                retv = xfrm_user_policy(sk, optname, optval, optlen);
 697                break;
 698
 699        case IPV6_ADDR_PREFERENCES:
 700            {
 701                unsigned int pref = 0;
 702                unsigned int prefmask = ~0;
 703
 704                if (optlen < sizeof(int))
 705                        goto e_inval;
 706
 707                retv = -EINVAL;
 708
 709                /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
 710                switch (val & (IPV6_PREFER_SRC_PUBLIC|
 711                               IPV6_PREFER_SRC_TMP|
 712                               IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
 713                case IPV6_PREFER_SRC_PUBLIC:
 714                        pref |= IPV6_PREFER_SRC_PUBLIC;
 715                        break;
 716                case IPV6_PREFER_SRC_TMP:
 717                        pref |= IPV6_PREFER_SRC_TMP;
 718                        break;
 719                case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
 720                        break;
 721                case 0:
 722                        goto pref_skip_pubtmp;
 723                default:
 724                        goto e_inval;
 725                }
 726
 727                prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
 728                              IPV6_PREFER_SRC_TMP);
 729pref_skip_pubtmp:
 730
 731                /* check HOME/COA conflicts */
 732                switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
 733                case IPV6_PREFER_SRC_HOME:
 734                        break;
 735                case IPV6_PREFER_SRC_COA:
 736                        pref |= IPV6_PREFER_SRC_COA;
 737                case 0:
 738                        goto pref_skip_coa;
 739                default:
 740                        goto e_inval;
 741                }
 742
 743                prefmask &= ~IPV6_PREFER_SRC_COA;
 744pref_skip_coa:
 745
 746                /* check CGA/NONCGA conflicts */
 747                switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
 748                case IPV6_PREFER_SRC_CGA:
 749                case IPV6_PREFER_SRC_NONCGA:
 750                case 0:
 751                        break;
 752                default:
 753                        goto e_inval;
 754                }
 755
 756                np->srcprefs = (np->srcprefs & prefmask) | pref;
 757                retv = 0;
 758
 759                break;
 760            }
 761        }
 762
 763        release_sock(sk);
 764
 765        return retv;
 766
 767e_inval:
 768        release_sock(sk);
 769        return -EINVAL;
 770}
 771
 772int ipv6_setsockopt(struct sock *sk, int level, int optname,
 773                    char __user *optval, int optlen)
 774{
 775        int err;
 776
 777        if (level == SOL_IP && sk->sk_type != SOCK_RAW)
 778                return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 779
 780        if (level != SOL_IPV6)
 781                return -ENOPROTOOPT;
 782
 783        err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 784#ifdef CONFIG_NETFILTER
 785        /* we need to exclude all possible ENOPROTOOPTs except default case */
 786        if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 787                        optname != IPV6_XFRM_POLICY) {
 788                lock_sock(sk);
 789                err = nf_setsockopt(sk, PF_INET6, optname, optval,
 790                                optlen);
 791                release_sock(sk);
 792        }
 793#endif
 794        return err;
 795}
 796
 797EXPORT_SYMBOL(ipv6_setsockopt);
 798
 799#ifdef CONFIG_COMPAT
 800int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 801                           char __user *optval, int optlen)
 802{
 803        int err;
 804
 805        if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
 806                if (udp_prot.compat_setsockopt != NULL)
 807                        return udp_prot.compat_setsockopt(sk, level, optname,
 808                                                          optval, optlen);
 809                return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 810        }
 811
 812        if (level != SOL_IPV6)
 813                return -ENOPROTOOPT;
 814
 815        if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
 816                return compat_mc_setsockopt(sk, level, optname, optval, optlen,
 817                        ipv6_setsockopt);
 818
 819        err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 820#ifdef CONFIG_NETFILTER
 821        /* we need to exclude all possible ENOPROTOOPTs except default case */
 822        if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
 823            optname != IPV6_XFRM_POLICY) {
 824                lock_sock(sk);
 825                err = compat_nf_setsockopt(sk, PF_INET6, optname,
 826                                           optval, optlen);
 827                release_sock(sk);
 828        }
 829#endif
 830        return err;
 831}
 832
 833EXPORT_SYMBOL(compat_ipv6_setsockopt);
 834#endif
 835
 836static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
 837                                  int optname, char __user *optval, int len)
 838{
 839        struct ipv6_opt_hdr *hdr;
 840
 841        if (!opt)
 842                return 0;
 843
 844        switch(optname) {
 845        case IPV6_HOPOPTS:
 846                hdr = opt->hopopt;
 847                break;
 848        case IPV6_RTHDRDSTOPTS:
 849                hdr = opt->dst0opt;
 850                break;
 851        case IPV6_RTHDR:
 852                hdr = (struct ipv6_opt_hdr *)opt->srcrt;
 853                break;
 854        case IPV6_DSTOPTS:
 855                hdr = opt->dst1opt;
 856                break;
 857        default:
 858                return -EINVAL; /* should not happen */
 859        }
 860
 861        if (!hdr)
 862                return 0;
 863
 864        len = min_t(unsigned int, len, ipv6_optlen(hdr));
 865        if (copy_to_user(optval, hdr, len))
 866                return -EFAULT;
 867        return len;
 868}
 869
 870static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 871                    char __user *optval, int __user *optlen)
 872{
 873        struct ipv6_pinfo *np = inet6_sk(sk);
 874        int len;
 875        int val;
 876
 877        if (ip6_mroute_opt(optname))
 878                return ip6_mroute_getsockopt(sk, optname, optval, optlen);
 879
 880        if (get_user(len, optlen))
 881                return -EFAULT;
 882        switch (optname) {
 883        case IPV6_ADDRFORM:
 884                if (sk->sk_protocol != IPPROTO_UDP &&
 885                    sk->sk_protocol != IPPROTO_UDPLITE &&
 886                    sk->sk_protocol != IPPROTO_TCP)
 887                        return -ENOPROTOOPT;
 888                if (sk->sk_state != TCP_ESTABLISHED)
 889                        return -ENOTCONN;
 890                val = sk->sk_family;
 891                break;
 892        case MCAST_MSFILTER:
 893        {
 894                struct group_filter gsf;
 895                int err;
 896
 897                if (len < GROUP_FILTER_SIZE(0))
 898                        return -EINVAL;
 899                if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
 900                        return -EFAULT;
 901                if (gsf.gf_group.ss_family != AF_INET6)
 902                        return -EADDRNOTAVAIL;
 903                lock_sock(sk);
 904                err = ip6_mc_msfget(sk, &gsf,
 905                        (struct group_filter __user *)optval, optlen);
 906                release_sock(sk);
 907                return err;
 908        }
 909
 910        case IPV6_2292PKTOPTIONS:
 911        {
 912                struct msghdr msg;
 913                struct sk_buff *skb;
 914
 915                if (sk->sk_type != SOCK_STREAM)
 916                        return -ENOPROTOOPT;
 917
 918                msg.msg_control = optval;
 919                msg.msg_controllen = len;
 920                msg.msg_flags = 0;
 921
 922                lock_sock(sk);
 923                skb = np->pktoptions;
 924                if (skb)
 925                        atomic_inc(&skb->users);
 926                release_sock(sk);
 927
 928                if (skb) {
 929                        int err = datagram_recv_ctl(sk, &msg, skb);
 930                        kfree_skb(skb);
 931                        if (err)
 932                                return err;
 933                } else {
 934                        if (np->rxopt.bits.rxinfo) {
 935                                struct in6_pktinfo src_info;
 936                                src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 937                                        np->sticky_pktinfo.ipi6_ifindex;
 938                                np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 939                                        ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 940                                put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 941                        }
 942                        if (np->rxopt.bits.rxhlim) {
 943                                int hlim = np->mcast_hops;
 944                                put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 945                        }
 946                        if (np->rxopt.bits.rxoinfo) {
 947                                struct in6_pktinfo src_info;
 948                                src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
 949                                        np->sticky_pktinfo.ipi6_ifindex;
 950                                np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
 951                                        ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 952                                put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
 953                        }
 954                        if (np->rxopt.bits.rxohlim) {
 955                                int hlim = np->mcast_hops;
 956                                put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
 957                        }
 958                }
 959                len -= msg.msg_controllen;
 960                return put_user(len, optlen);
 961        }
 962        case IPV6_MTU:
 963        {
 964                struct dst_entry *dst;
 965                val = 0;
 966                lock_sock(sk);
 967                dst = sk_dst_get(sk);
 968                if (dst) {
 969                        val = dst_mtu(dst);
 970                        dst_release(dst);
 971                }
 972                release_sock(sk);
 973                if (!val)
 974                        return -ENOTCONN;
 975                break;
 976        }
 977
 978        case IPV6_V6ONLY:
 979                val = np->ipv6only;
 980                break;
 981
 982        case IPV6_RECVPKTINFO:
 983                val = np->rxopt.bits.rxinfo;
 984                break;
 985
 986        case IPV6_2292PKTINFO:
 987                val = np->rxopt.bits.rxoinfo;
 988                break;
 989
 990        case IPV6_RECVHOPLIMIT:
 991                val = np->rxopt.bits.rxhlim;
 992                break;
 993
 994        case IPV6_2292HOPLIMIT:
 995                val = np->rxopt.bits.rxohlim;
 996                break;
 997
 998        case IPV6_RECVRTHDR:
 999                val = np->rxopt.bits.srcrt;
1000                break;
1001
1002        case IPV6_2292RTHDR:
1003                val = np->rxopt.bits.osrcrt;
1004                break;
1005
1006        case IPV6_HOPOPTS:
1007        case IPV6_RTHDRDSTOPTS:
1008        case IPV6_RTHDR:
1009        case IPV6_DSTOPTS:
1010        {
1011
1012                lock_sock(sk);
1013                len = ipv6_getsockopt_sticky(sk, np->opt,
1014                                             optname, optval, len);
1015                release_sock(sk);
1016                /* check if ipv6_getsockopt_sticky() returns err code */
1017                if (len < 0)
1018                        return len;
1019                return put_user(len, optlen);
1020        }
1021
1022        case IPV6_RECVHOPOPTS:
1023                val = np->rxopt.bits.hopopts;
1024                break;
1025
1026        case IPV6_2292HOPOPTS:
1027                val = np->rxopt.bits.ohopopts;
1028                break;
1029
1030        case IPV6_RECVDSTOPTS:
1031                val = np->rxopt.bits.dstopts;
1032                break;
1033
1034        case IPV6_2292DSTOPTS:
1035                val = np->rxopt.bits.odstopts;
1036                break;
1037
1038        case IPV6_TCLASS:
1039                val = np->tclass;
1040                if (val < 0)
1041                        val = 0;
1042                break;
1043
1044        case IPV6_RECVTCLASS:
1045                val = np->rxopt.bits.rxtclass;
1046                break;
1047
1048        case IPV6_FLOWINFO:
1049                val = np->rxopt.bits.rxflow;
1050                break;
1051
1052        case IPV6_UNICAST_HOPS:
1053        case IPV6_MULTICAST_HOPS:
1054        {
1055                struct dst_entry *dst;
1056
1057                if (optname == IPV6_UNICAST_HOPS)
1058                        val = np->hop_limit;
1059                else
1060                        val = np->mcast_hops;
1061
1062                dst = sk_dst_get(sk);
1063                if (dst) {
1064                        if (val < 0)
1065                                val = ip6_dst_hoplimit(dst);
1066                        dst_release(dst);
1067                }
1068                if (val < 0)
1069                        val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1070                break;
1071        }
1072
1073        case IPV6_MULTICAST_LOOP:
1074                val = np->mc_loop;
1075                break;
1076
1077        case IPV6_MULTICAST_IF:
1078                val = np->mcast_oif;
1079                break;
1080
1081        case IPV6_MTU_DISCOVER:
1082                val = np->pmtudisc;
1083                break;
1084
1085        case IPV6_RECVERR:
1086                val = np->recverr;
1087                break;
1088
1089        case IPV6_FLOWINFO_SEND:
1090                val = np->sndflow;
1091                break;
1092
1093        case IPV6_ADDR_PREFERENCES:
1094                val = 0;
1095
1096                if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1097                        val |= IPV6_PREFER_SRC_TMP;
1098                else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1099                        val |= IPV6_PREFER_SRC_PUBLIC;
1100                else {
1101                        /* XXX: should we return system default? */
1102                        val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1103                }
1104
1105                if (np->srcprefs & IPV6_PREFER_SRC_COA)
1106                        val |= IPV6_PREFER_SRC_COA;
1107                else
1108                        val |= IPV6_PREFER_SRC_HOME;
1109                break;
1110
1111        default:
1112                return -ENOPROTOOPT;
1113        }
1114        len = min_t(unsigned int, sizeof(int), len);
1115        if(put_user(len, optlen))
1116                return -EFAULT;
1117        if(copy_to_user(optval,&val,len))
1118                return -EFAULT;
1119        return 0;
1120}
1121
1122int ipv6_getsockopt(struct sock *sk, int level, int optname,
1123                    char __user *optval, int __user *optlen)
1124{
1125        int err;
1126
1127        if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1128                return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1129
1130        if(level != SOL_IPV6)
1131                return -ENOPROTOOPT;
1132
1133        err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1134#ifdef CONFIG_NETFILTER
1135        /* we need to exclude all possible ENOPROTOOPTs except default case */
1136        if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1137                int len;
1138
1139                if (get_user(len, optlen))
1140                        return -EFAULT;
1141
1142                lock_sock(sk);
1143                err = nf_getsockopt(sk, PF_INET6, optname, optval,
1144                                &len);
1145                release_sock(sk);
1146                if (err >= 0)
1147                        err = put_user(len, optlen);
1148        }
1149#endif
1150        return err;
1151}
1152
1153EXPORT_SYMBOL(ipv6_getsockopt);
1154
1155#ifdef CONFIG_COMPAT
1156int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1157                           char __user *optval, int __user *optlen)
1158{
1159        int err;
1160
1161        if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1162                if (udp_prot.compat_getsockopt != NULL)
1163                        return udp_prot.compat_getsockopt(sk, level, optname,
1164                                                          optval, optlen);
1165                return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1166        }
1167
1168        if (level != SOL_IPV6)
1169                return -ENOPROTOOPT;
1170
1171        if (optname == MCAST_MSFILTER)
1172                return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1173                        ipv6_getsockopt);
1174
1175        err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1176#ifdef CONFIG_NETFILTER
1177        /* we need to exclude all possible ENOPROTOOPTs except default case */
1178        if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1179                int len;
1180
1181                if (get_user(len, optlen))
1182                        return -EFAULT;
1183
1184                lock_sock(sk);
1185                err = compat_nf_getsockopt(sk, PF_INET6,
1186                                           optname, optval, &len);
1187                release_sock(sk);
1188                if (err >= 0)
1189                        err = put_user(len, optlen);
1190        }
1191#endif
1192        return err;
1193}
1194
1195EXPORT_SYMBOL(compat_ipv6_getsockopt);
1196#endif
1197
1198