linux/net/ipv6/mcast.c
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   1/*
   2 *      Multicast support for IPv6
   3 *      Linux INET6 implementation
   4 *
   5 *      Authors:
   6 *      Pedro Roque             <roque@di.fc.ul.pt>
   7 *
   8 *      Based on linux/ipv4/igmp.c and linux/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
  16/* Changes:
  17 *
  18 *      yoshfuji        : fix format of router-alert option
  19 *      YOSHIFUJI Hideaki @USAGI:
  20 *              Fixed source address for MLD message based on
  21 *              <draft-ietf-magma-mld-source-05.txt>.
  22 *      YOSHIFUJI Hideaki @USAGI:
  23 *              - Ignore Queries for invalid addresses.
  24 *              - MLD for link-local addresses.
  25 *      David L Stevens <dlstevens@us.ibm.com>:
  26 *              - MLDv2 support
  27 */
  28
  29#include <linux/module.h>
  30#include <linux/errno.h>
  31#include <linux/types.h>
  32#include <linux/string.h>
  33#include <linux/socket.h>
  34#include <linux/sockios.h>
  35#include <linux/jiffies.h>
  36#include <linux/times.h>
  37#include <linux/net.h>
  38#include <linux/in.h>
  39#include <linux/in6.h>
  40#include <linux/netdevice.h>
  41#include <linux/if_arp.h>
  42#include <linux/route.h>
  43#include <linux/init.h>
  44#include <linux/proc_fs.h>
  45#include <linux/seq_file.h>
  46
  47#include <linux/netfilter.h>
  48#include <linux/netfilter_ipv6.h>
  49
  50#include <net/net_namespace.h>
  51#include <net/sock.h>
  52#include <net/snmp.h>
  53
  54#include <net/ipv6.h>
  55#include <net/protocol.h>
  56#include <net/if_inet6.h>
  57#include <net/ndisc.h>
  58#include <net/addrconf.h>
  59#include <net/ip6_route.h>
  60#include <net/inet_common.h>
  61
  62#include <net/ip6_checksum.h>
  63
  64/* Set to 3 to get tracing... */
  65#define MCAST_DEBUG 2
  66
  67#if MCAST_DEBUG >= 3
  68#define MDBG(x) printk x
  69#else
  70#define MDBG(x)
  71#endif
  72
  73/*
  74 *  These header formats should be in a separate include file, but icmpv6.h
  75 *  doesn't have in6_addr defined in all cases, there is no __u128, and no
  76 *  other files reference these.
  77 *
  78 *                      +-DLS 4/14/03
  79 */
  80
  81/* Multicast Listener Discovery version 2 headers */
  82
  83struct mld2_grec {
  84        __u8            grec_type;
  85        __u8            grec_auxwords;
  86        __be16          grec_nsrcs;
  87        struct in6_addr grec_mca;
  88        struct in6_addr grec_src[0];
  89};
  90
  91struct mld2_report {
  92        __u8    type;
  93        __u8    resv1;
  94        __sum16 csum;
  95        __be16  resv2;
  96        __be16  ngrec;
  97        struct mld2_grec grec[0];
  98};
  99
 100struct mld2_query {
 101        __u8 type;
 102        __u8 code;
 103        __sum16 csum;
 104        __be16 mrc;
 105        __be16 resv1;
 106        struct in6_addr mca;
 107#if defined(__LITTLE_ENDIAN_BITFIELD)
 108        __u8 qrv:3,
 109             suppress:1,
 110             resv2:4;
 111#elif defined(__BIG_ENDIAN_BITFIELD)
 112        __u8 resv2:4,
 113             suppress:1,
 114             qrv:3;
 115#else
 116#error "Please fix <asm/byteorder.h>"
 117#endif
 118        __u8 qqic;
 119        __be16 nsrcs;
 120        struct in6_addr srcs[0];
 121};
 122
 123static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
 124
 125/* Big mc list lock for all the sockets */
 126static DEFINE_RWLOCK(ipv6_sk_mc_lock);
 127
 128static void igmp6_join_group(struct ifmcaddr6 *ma);
 129static void igmp6_leave_group(struct ifmcaddr6 *ma);
 130static void igmp6_timer_handler(unsigned long data);
 131
 132static void mld_gq_timer_expire(unsigned long data);
 133static void mld_ifc_timer_expire(unsigned long data);
 134static void mld_ifc_event(struct inet6_dev *idev);
 135static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
 136static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
 137static void mld_clear_delrec(struct inet6_dev *idev);
 138static int sf_setstate(struct ifmcaddr6 *pmc);
 139static void sf_markstate(struct ifmcaddr6 *pmc);
 140static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 141static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
 142                          int sfmode, int sfcount, struct in6_addr *psfsrc,
 143                          int delta);
 144static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
 145                          int sfmode, int sfcount, struct in6_addr *psfsrc,
 146                          int delta);
 147static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 148                            struct inet6_dev *idev);
 149
 150
 151#define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 152#define MLD_QRV_DEFAULT         2
 153
 154#define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 155                (idev)->cnf.force_mld_version == 1 || \
 156                ((idev)->mc_v1_seen && \
 157                time_before(jiffies, (idev)->mc_v1_seen)))
 158
 159#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
 160#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
 161        ((value) < (thresh) ? (value) : \
 162        ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
 163        (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 164
 165#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
 166
 167#define IPV6_MLD_MAX_MSF        64
 168
 169int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 170
 171/*
 172 *      socket join on multicast group
 173 */
 174
 175int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 176{
 177        struct net_device *dev = NULL;
 178        struct ipv6_mc_socklist *mc_lst;
 179        struct ipv6_pinfo *np = inet6_sk(sk);
 180        struct net *net = sock_net(sk);
 181        int err;
 182
 183        if (!ipv6_addr_is_multicast(addr))
 184                return -EINVAL;
 185
 186        read_lock_bh(&ipv6_sk_mc_lock);
 187        for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
 188                if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 189                    ipv6_addr_equal(&mc_lst->addr, addr)) {
 190                        read_unlock_bh(&ipv6_sk_mc_lock);
 191                        return -EADDRINUSE;
 192                }
 193        }
 194        read_unlock_bh(&ipv6_sk_mc_lock);
 195
 196        mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 197
 198        if (mc_lst == NULL)
 199                return -ENOMEM;
 200
 201        mc_lst->next = NULL;
 202        ipv6_addr_copy(&mc_lst->addr, addr);
 203
 204        if (ifindex == 0) {
 205                struct rt6_info *rt;
 206                rt = rt6_lookup(net, addr, NULL, 0, 0);
 207                if (rt) {
 208                        dev = rt->rt6i_dev;
 209                        dev_hold(dev);
 210                        dst_release(&rt->u.dst);
 211                }
 212        } else
 213                dev = dev_get_by_index(net, ifindex);
 214
 215        if (dev == NULL) {
 216                sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 217                return -ENODEV;
 218        }
 219
 220        mc_lst->ifindex = dev->ifindex;
 221        mc_lst->sfmode = MCAST_EXCLUDE;
 222        rwlock_init(&mc_lst->sflock);
 223        mc_lst->sflist = NULL;
 224
 225        /*
 226         *      now add/increase the group membership on the device
 227         */
 228
 229        err = ipv6_dev_mc_inc(dev, addr);
 230
 231        if (err) {
 232                sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 233                dev_put(dev);
 234                return err;
 235        }
 236
 237        write_lock_bh(&ipv6_sk_mc_lock);
 238        mc_lst->next = np->ipv6_mc_list;
 239        np->ipv6_mc_list = mc_lst;
 240        write_unlock_bh(&ipv6_sk_mc_lock);
 241
 242        dev_put(dev);
 243
 244        return 0;
 245}
 246
 247/*
 248 *      socket leave on multicast group
 249 */
 250int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 251{
 252        struct ipv6_pinfo *np = inet6_sk(sk);
 253        struct ipv6_mc_socklist *mc_lst, **lnk;
 254        struct net *net = sock_net(sk);
 255
 256        write_lock_bh(&ipv6_sk_mc_lock);
 257        for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
 258                if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 259                    ipv6_addr_equal(&mc_lst->addr, addr)) {
 260                        struct net_device *dev;
 261
 262                        *lnk = mc_lst->next;
 263                        write_unlock_bh(&ipv6_sk_mc_lock);
 264
 265                        dev = dev_get_by_index(net, mc_lst->ifindex);
 266                        if (dev != NULL) {
 267                                struct inet6_dev *idev = in6_dev_get(dev);
 268
 269                                (void) ip6_mc_leave_src(sk, mc_lst, idev);
 270                                if (idev) {
 271                                        __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 272                                        in6_dev_put(idev);
 273                                }
 274                                dev_put(dev);
 275                        } else
 276                                (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 277                        sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 278                        return 0;
 279                }
 280        }
 281        write_unlock_bh(&ipv6_sk_mc_lock);
 282
 283        return -EADDRNOTAVAIL;
 284}
 285
 286static struct inet6_dev *ip6_mc_find_dev(struct net *net,
 287                                         struct in6_addr *group,
 288                                         int ifindex)
 289{
 290        struct net_device *dev = NULL;
 291        struct inet6_dev *idev = NULL;
 292
 293        if (ifindex == 0) {
 294                struct rt6_info *rt;
 295
 296                rt = rt6_lookup(net, group, NULL, 0, 0);
 297                if (rt) {
 298                        dev = rt->rt6i_dev;
 299                        dev_hold(dev);
 300                        dst_release(&rt->u.dst);
 301                }
 302        } else
 303                dev = dev_get_by_index(net, ifindex);
 304
 305        if (!dev)
 306                goto nodev;
 307        idev = in6_dev_get(dev);
 308        if (!idev)
 309                goto release;
 310        read_lock_bh(&idev->lock);
 311        if (idev->dead)
 312                goto unlock_release;
 313
 314        return idev;
 315
 316unlock_release:
 317        read_unlock_bh(&idev->lock);
 318        in6_dev_put(idev);
 319release:
 320        dev_put(dev);
 321nodev:
 322        return NULL;
 323}
 324
 325void ipv6_sock_mc_close(struct sock *sk)
 326{
 327        struct ipv6_pinfo *np = inet6_sk(sk);
 328        struct ipv6_mc_socklist *mc_lst;
 329        struct net *net = sock_net(sk);
 330
 331        write_lock_bh(&ipv6_sk_mc_lock);
 332        while ((mc_lst = np->ipv6_mc_list) != NULL) {
 333                struct net_device *dev;
 334
 335                np->ipv6_mc_list = mc_lst->next;
 336                write_unlock_bh(&ipv6_sk_mc_lock);
 337
 338                dev = dev_get_by_index(net, mc_lst->ifindex);
 339                if (dev) {
 340                        struct inet6_dev *idev = in6_dev_get(dev);
 341
 342                        (void) ip6_mc_leave_src(sk, mc_lst, idev);
 343                        if (idev) {
 344                                __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 345                                in6_dev_put(idev);
 346                        }
 347                        dev_put(dev);
 348                } else
 349                        (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 350
 351                sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 352
 353                write_lock_bh(&ipv6_sk_mc_lock);
 354        }
 355        write_unlock_bh(&ipv6_sk_mc_lock);
 356}
 357
 358int ip6_mc_source(int add, int omode, struct sock *sk,
 359        struct group_source_req *pgsr)
 360{
 361        struct in6_addr *source, *group;
 362        struct ipv6_mc_socklist *pmc;
 363        struct net_device *dev;
 364        struct inet6_dev *idev;
 365        struct ipv6_pinfo *inet6 = inet6_sk(sk);
 366        struct ip6_sf_socklist *psl;
 367        struct net *net = sock_net(sk);
 368        int i, j, rv;
 369        int leavegroup = 0;
 370        int pmclocked = 0;
 371        int err;
 372
 373        source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 374        group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 375
 376        if (!ipv6_addr_is_multicast(group))
 377                return -EINVAL;
 378
 379        idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
 380        if (!idev)
 381                return -ENODEV;
 382        dev = idev->dev;
 383
 384        err = -EADDRNOTAVAIL;
 385
 386        read_lock_bh(&ipv6_sk_mc_lock);
 387        for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 388                if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 389                        continue;
 390                if (ipv6_addr_equal(&pmc->addr, group))
 391                        break;
 392        }
 393        if (!pmc) {             /* must have a prior join */
 394                err = -EINVAL;
 395                goto done;
 396        }
 397        /* if a source filter was set, must be the same mode as before */
 398        if (pmc->sflist) {
 399                if (pmc->sfmode != omode) {
 400                        err = -EINVAL;
 401                        goto done;
 402                }
 403        } else if (pmc->sfmode != omode) {
 404                /* allow mode switches for empty-set filters */
 405                ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 406                ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 407                pmc->sfmode = omode;
 408        }
 409
 410        write_lock_bh(&pmc->sflock);
 411        pmclocked = 1;
 412
 413        psl = pmc->sflist;
 414        if (!add) {
 415                if (!psl)
 416                        goto done;      /* err = -EADDRNOTAVAIL */
 417                rv = !0;
 418                for (i=0; i<psl->sl_count; i++) {
 419                        rv = memcmp(&psl->sl_addr[i], source,
 420                                sizeof(struct in6_addr));
 421                        if (rv == 0)
 422                                break;
 423                }
 424                if (rv)         /* source not found */
 425                        goto done;      /* err = -EADDRNOTAVAIL */
 426
 427                /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 428                if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 429                        leavegroup = 1;
 430                        goto done;
 431                }
 432
 433                /* update the interface filter */
 434                ip6_mc_del_src(idev, group, omode, 1, source, 1);
 435
 436                for (j=i+1; j<psl->sl_count; j++)
 437                        psl->sl_addr[j-1] = psl->sl_addr[j];
 438                psl->sl_count--;
 439                err = 0;
 440                goto done;
 441        }
 442        /* else, add a new source to the filter */
 443
 444        if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 445                err = -ENOBUFS;
 446                goto done;
 447        }
 448        if (!psl || psl->sl_count == psl->sl_max) {
 449                struct ip6_sf_socklist *newpsl;
 450                int count = IP6_SFBLOCK;
 451
 452                if (psl)
 453                        count += psl->sl_max;
 454                newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 455                if (!newpsl) {
 456                        err = -ENOBUFS;
 457                        goto done;
 458                }
 459                newpsl->sl_max = count;
 460                newpsl->sl_count = count - IP6_SFBLOCK;
 461                if (psl) {
 462                        for (i=0; i<psl->sl_count; i++)
 463                                newpsl->sl_addr[i] = psl->sl_addr[i];
 464                        sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 465                }
 466                pmc->sflist = psl = newpsl;
 467        }
 468        rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 469        for (i=0; i<psl->sl_count; i++) {
 470                rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 471                if (rv == 0)
 472                        break;
 473        }
 474        if (rv == 0)            /* address already there is an error */
 475                goto done;
 476        for (j=psl->sl_count-1; j>=i; j--)
 477                psl->sl_addr[j+1] = psl->sl_addr[j];
 478        psl->sl_addr[i] = *source;
 479        psl->sl_count++;
 480        err = 0;
 481        /* update the interface list */
 482        ip6_mc_add_src(idev, group, omode, 1, source, 1);
 483done:
 484        if (pmclocked)
 485                write_unlock_bh(&pmc->sflock);
 486        read_unlock_bh(&ipv6_sk_mc_lock);
 487        read_unlock_bh(&idev->lock);
 488        in6_dev_put(idev);
 489        dev_put(dev);
 490        if (leavegroup)
 491                return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 492        return err;
 493}
 494
 495int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 496{
 497        struct in6_addr *group;
 498        struct ipv6_mc_socklist *pmc;
 499        struct net_device *dev;
 500        struct inet6_dev *idev;
 501        struct ipv6_pinfo *inet6 = inet6_sk(sk);
 502        struct ip6_sf_socklist *newpsl, *psl;
 503        struct net *net = sock_net(sk);
 504        int leavegroup = 0;
 505        int i, err;
 506
 507        group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 508
 509        if (!ipv6_addr_is_multicast(group))
 510                return -EINVAL;
 511        if (gsf->gf_fmode != MCAST_INCLUDE &&
 512            gsf->gf_fmode != MCAST_EXCLUDE)
 513                return -EINVAL;
 514
 515        idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 516
 517        if (!idev)
 518                return -ENODEV;
 519        dev = idev->dev;
 520
 521        err = 0;
 522        read_lock_bh(&ipv6_sk_mc_lock);
 523
 524        if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 525                leavegroup = 1;
 526                goto done;
 527        }
 528
 529        for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 530                if (pmc->ifindex != gsf->gf_interface)
 531                        continue;
 532                if (ipv6_addr_equal(&pmc->addr, group))
 533                        break;
 534        }
 535        if (!pmc) {             /* must have a prior join */
 536                err = -EINVAL;
 537                goto done;
 538        }
 539        if (gsf->gf_numsrc) {
 540                newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 541                                                          GFP_ATOMIC);
 542                if (!newpsl) {
 543                        err = -ENOBUFS;
 544                        goto done;
 545                }
 546                newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 547                for (i=0; i<newpsl->sl_count; ++i) {
 548                        struct sockaddr_in6 *psin6;
 549
 550                        psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 551                        newpsl->sl_addr[i] = psin6->sin6_addr;
 552                }
 553                err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 554                        newpsl->sl_count, newpsl->sl_addr, 0);
 555                if (err) {
 556                        sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 557                        goto done;
 558                }
 559        } else {
 560                newpsl = NULL;
 561                (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 562        }
 563
 564        write_lock_bh(&pmc->sflock);
 565        psl = pmc->sflist;
 566        if (psl) {
 567                (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 568                        psl->sl_count, psl->sl_addr, 0);
 569                sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 570        } else
 571                (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 572        pmc->sflist = newpsl;
 573        pmc->sfmode = gsf->gf_fmode;
 574        write_unlock_bh(&pmc->sflock);
 575        err = 0;
 576done:
 577        read_unlock_bh(&ipv6_sk_mc_lock);
 578        read_unlock_bh(&idev->lock);
 579        in6_dev_put(idev);
 580        dev_put(dev);
 581        if (leavegroup)
 582                err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 583        return err;
 584}
 585
 586int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 587        struct group_filter __user *optval, int __user *optlen)
 588{
 589        int err, i, count, copycount;
 590        struct in6_addr *group;
 591        struct ipv6_mc_socklist *pmc;
 592        struct inet6_dev *idev;
 593        struct net_device *dev;
 594        struct ipv6_pinfo *inet6 = inet6_sk(sk);
 595        struct ip6_sf_socklist *psl;
 596        struct net *net = sock_net(sk);
 597
 598        group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 599
 600        if (!ipv6_addr_is_multicast(group))
 601                return -EINVAL;
 602
 603        idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 604
 605        if (!idev)
 606                return -ENODEV;
 607
 608        dev = idev->dev;
 609
 610        err = -EADDRNOTAVAIL;
 611        /*
 612         * changes to the ipv6_mc_list require the socket lock and
 613         * a read lock on ip6_sk_mc_lock. We have the socket lock,
 614         * so reading the list is safe.
 615         */
 616
 617        for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 618                if (pmc->ifindex != gsf->gf_interface)
 619                        continue;
 620                if (ipv6_addr_equal(group, &pmc->addr))
 621                        break;
 622        }
 623        if (!pmc)               /* must have a prior join */
 624                goto done;
 625        gsf->gf_fmode = pmc->sfmode;
 626        psl = pmc->sflist;
 627        count = psl ? psl->sl_count : 0;
 628        read_unlock_bh(&idev->lock);
 629        in6_dev_put(idev);
 630        dev_put(dev);
 631
 632        copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 633        gsf->gf_numsrc = count;
 634        if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 635            copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 636                return -EFAULT;
 637        }
 638        /* changes to psl require the socket lock, a read lock on
 639         * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 640         * have the socket lock, so reading here is safe.
 641         */
 642        for (i=0; i<copycount; i++) {
 643                struct sockaddr_in6 *psin6;
 644                struct sockaddr_storage ss;
 645
 646                psin6 = (struct sockaddr_in6 *)&ss;
 647                memset(&ss, 0, sizeof(ss));
 648                psin6->sin6_family = AF_INET6;
 649                psin6->sin6_addr = psl->sl_addr[i];
 650                if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 651                        return -EFAULT;
 652        }
 653        return 0;
 654done:
 655        read_unlock_bh(&idev->lock);
 656        in6_dev_put(idev);
 657        dev_put(dev);
 658        return err;
 659}
 660
 661int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 662                   const struct in6_addr *src_addr)
 663{
 664        struct ipv6_pinfo *np = inet6_sk(sk);
 665        struct ipv6_mc_socklist *mc;
 666        struct ip6_sf_socklist *psl;
 667        int rv = 1;
 668
 669        read_lock(&ipv6_sk_mc_lock);
 670        for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 671                if (ipv6_addr_equal(&mc->addr, mc_addr))
 672                        break;
 673        }
 674        if (!mc) {
 675                read_unlock(&ipv6_sk_mc_lock);
 676                return 1;
 677        }
 678        read_lock(&mc->sflock);
 679        psl = mc->sflist;
 680        if (!psl) {
 681                rv = mc->sfmode == MCAST_EXCLUDE;
 682        } else {
 683                int i;
 684
 685                for (i=0; i<psl->sl_count; i++) {
 686                        if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 687                                break;
 688                }
 689                if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 690                        rv = 0;
 691                if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 692                        rv = 0;
 693        }
 694        read_unlock(&mc->sflock);
 695        read_unlock(&ipv6_sk_mc_lock);
 696
 697        return rv;
 698}
 699
 700static void ma_put(struct ifmcaddr6 *mc)
 701{
 702        if (atomic_dec_and_test(&mc->mca_refcnt)) {
 703                in6_dev_put(mc->idev);
 704                kfree(mc);
 705        }
 706}
 707
 708static void igmp6_group_added(struct ifmcaddr6 *mc)
 709{
 710        struct net_device *dev = mc->idev->dev;
 711        char buf[MAX_ADDR_LEN];
 712
 713        spin_lock_bh(&mc->mca_lock);
 714        if (!(mc->mca_flags&MAF_LOADED)) {
 715                mc->mca_flags |= MAF_LOADED;
 716                if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 717                        dev_mc_add(dev, buf, dev->addr_len, 0);
 718        }
 719        spin_unlock_bh(&mc->mca_lock);
 720
 721        if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 722                return;
 723
 724        if (MLD_V1_SEEN(mc->idev)) {
 725                igmp6_join_group(mc);
 726                return;
 727        }
 728        /* else v2 */
 729
 730        mc->mca_crcount = mc->idev->mc_qrv;
 731        mld_ifc_event(mc->idev);
 732}
 733
 734static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 735{
 736        struct net_device *dev = mc->idev->dev;
 737        char buf[MAX_ADDR_LEN];
 738
 739        spin_lock_bh(&mc->mca_lock);
 740        if (mc->mca_flags&MAF_LOADED) {
 741                mc->mca_flags &= ~MAF_LOADED;
 742                if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 743                        dev_mc_delete(dev, buf, dev->addr_len, 0);
 744        }
 745
 746        if (mc->mca_flags & MAF_NOREPORT)
 747                goto done;
 748        spin_unlock_bh(&mc->mca_lock);
 749
 750        if (!mc->idev->dead)
 751                igmp6_leave_group(mc);
 752
 753        spin_lock_bh(&mc->mca_lock);
 754        if (del_timer(&mc->mca_timer))
 755                atomic_dec(&mc->mca_refcnt);
 756done:
 757        ip6_mc_clear_src(mc);
 758        spin_unlock_bh(&mc->mca_lock);
 759}
 760
 761/*
 762 * deleted ifmcaddr6 manipulation
 763 */
 764static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 765{
 766        struct ifmcaddr6 *pmc;
 767
 768        /* this is an "ifmcaddr6" for convenience; only the fields below
 769         * are actually used. In particular, the refcnt and users are not
 770         * used for management of the delete list. Using the same structure
 771         * for deleted items allows change reports to use common code with
 772         * non-deleted or query-response MCA's.
 773         */
 774        pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 775        if (!pmc)
 776                return;
 777
 778        spin_lock_bh(&im->mca_lock);
 779        spin_lock_init(&pmc->mca_lock);
 780        pmc->idev = im->idev;
 781        in6_dev_hold(idev);
 782        pmc->mca_addr = im->mca_addr;
 783        pmc->mca_crcount = idev->mc_qrv;
 784        pmc->mca_sfmode = im->mca_sfmode;
 785        if (pmc->mca_sfmode == MCAST_INCLUDE) {
 786                struct ip6_sf_list *psf;
 787
 788                pmc->mca_tomb = im->mca_tomb;
 789                pmc->mca_sources = im->mca_sources;
 790                im->mca_tomb = im->mca_sources = NULL;
 791                for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 792                        psf->sf_crcount = pmc->mca_crcount;
 793        }
 794        spin_unlock_bh(&im->mca_lock);
 795
 796        write_lock_bh(&idev->mc_lock);
 797        pmc->next = idev->mc_tomb;
 798        idev->mc_tomb = pmc;
 799        write_unlock_bh(&idev->mc_lock);
 800}
 801
 802static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 803{
 804        struct ifmcaddr6 *pmc, *pmc_prev;
 805        struct ip6_sf_list *psf, *psf_next;
 806
 807        write_lock_bh(&idev->mc_lock);
 808        pmc_prev = NULL;
 809        for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 810                if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 811                        break;
 812                pmc_prev = pmc;
 813        }
 814        if (pmc) {
 815                if (pmc_prev)
 816                        pmc_prev->next = pmc->next;
 817                else
 818                        idev->mc_tomb = pmc->next;
 819        }
 820        write_unlock_bh(&idev->mc_lock);
 821        if (pmc) {
 822                for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 823                        psf_next = psf->sf_next;
 824                        kfree(psf);
 825                }
 826                in6_dev_put(pmc->idev);
 827                kfree(pmc);
 828        }
 829}
 830
 831static void mld_clear_delrec(struct inet6_dev *idev)
 832{
 833        struct ifmcaddr6 *pmc, *nextpmc;
 834
 835        write_lock_bh(&idev->mc_lock);
 836        pmc = idev->mc_tomb;
 837        idev->mc_tomb = NULL;
 838        write_unlock_bh(&idev->mc_lock);
 839
 840        for (; pmc; pmc = nextpmc) {
 841                nextpmc = pmc->next;
 842                ip6_mc_clear_src(pmc);
 843                in6_dev_put(pmc->idev);
 844                kfree(pmc);
 845        }
 846
 847        /* clear dead sources, too */
 848        read_lock_bh(&idev->lock);
 849        for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 850                struct ip6_sf_list *psf, *psf_next;
 851
 852                spin_lock_bh(&pmc->mca_lock);
 853                psf = pmc->mca_tomb;
 854                pmc->mca_tomb = NULL;
 855                spin_unlock_bh(&pmc->mca_lock);
 856                for (; psf; psf=psf_next) {
 857                        psf_next = psf->sf_next;
 858                        kfree(psf);
 859                }
 860        }
 861        read_unlock_bh(&idev->lock);
 862}
 863
 864
 865/*
 866 *      device multicast group inc (add if not found)
 867 */
 868int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 869{
 870        struct ifmcaddr6 *mc;
 871        struct inet6_dev *idev;
 872
 873        idev = in6_dev_get(dev);
 874
 875        if (idev == NULL)
 876                return -EINVAL;
 877
 878        write_lock_bh(&idev->lock);
 879        if (idev->dead) {
 880                write_unlock_bh(&idev->lock);
 881                in6_dev_put(idev);
 882                return -ENODEV;
 883        }
 884
 885        for (mc = idev->mc_list; mc; mc = mc->next) {
 886                if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 887                        mc->mca_users++;
 888                        write_unlock_bh(&idev->lock);
 889                        ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 890                                NULL, 0);
 891                        in6_dev_put(idev);
 892                        return 0;
 893                }
 894        }
 895
 896        /*
 897         *      not found: create a new one.
 898         */
 899
 900        mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 901
 902        if (mc == NULL) {
 903                write_unlock_bh(&idev->lock);
 904                in6_dev_put(idev);
 905                return -ENOMEM;
 906        }
 907
 908        setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 909
 910        ipv6_addr_copy(&mc->mca_addr, addr);
 911        mc->idev = idev;
 912        mc->mca_users = 1;
 913        /* mca_stamp should be updated upon changes */
 914        mc->mca_cstamp = mc->mca_tstamp = jiffies;
 915        atomic_set(&mc->mca_refcnt, 2);
 916        spin_lock_init(&mc->mca_lock);
 917
 918        /* initial mode is (EX, empty) */
 919        mc->mca_sfmode = MCAST_EXCLUDE;
 920        mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 921
 922        if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 923            IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 924                mc->mca_flags |= MAF_NOREPORT;
 925
 926        mc->next = idev->mc_list;
 927        idev->mc_list = mc;
 928        write_unlock_bh(&idev->lock);
 929
 930        mld_del_delrec(idev, &mc->mca_addr);
 931        igmp6_group_added(mc);
 932        ma_put(mc);
 933        return 0;
 934}
 935
 936/*
 937 *      device multicast group del
 938 */
 939int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 940{
 941        struct ifmcaddr6 *ma, **map;
 942
 943        write_lock_bh(&idev->lock);
 944        for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 945                if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 946                        if (--ma->mca_users == 0) {
 947                                *map = ma->next;
 948                                write_unlock_bh(&idev->lock);
 949
 950                                igmp6_group_dropped(ma);
 951
 952                                ma_put(ma);
 953                                return 0;
 954                        }
 955                        write_unlock_bh(&idev->lock);
 956                        return 0;
 957                }
 958        }
 959        write_unlock_bh(&idev->lock);
 960
 961        return -ENOENT;
 962}
 963
 964int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 965{
 966        struct inet6_dev *idev = in6_dev_get(dev);
 967        int err;
 968
 969        if (!idev)
 970                return -ENODEV;
 971
 972        err = __ipv6_dev_mc_dec(idev, addr);
 973
 974        in6_dev_put(idev);
 975
 976        return err;
 977}
 978
 979/*
 980 * identify MLD packets for MLD filter exceptions
 981 */
 982int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 983{
 984        struct icmp6hdr *pic;
 985
 986        if (nexthdr != IPPROTO_ICMPV6)
 987                return 0;
 988
 989        if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 990                return 0;
 991
 992        pic = icmp6_hdr(skb);
 993
 994        switch (pic->icmp6_type) {
 995        case ICMPV6_MGM_QUERY:
 996        case ICMPV6_MGM_REPORT:
 997        case ICMPV6_MGM_REDUCTION:
 998        case ICMPV6_MLD2_REPORT:
 999                return 1;
1000        default:
1001                break;
1002        }
1003        return 0;
1004}
1005
1006/*
1007 *      check if the interface/address pair is valid
1008 */
1009int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1010                        const struct in6_addr *src_addr)
1011{
1012        struct inet6_dev *idev;
1013        struct ifmcaddr6 *mc;
1014        int rv = 0;
1015
1016        idev = in6_dev_get(dev);
1017        if (idev) {
1018                read_lock_bh(&idev->lock);
1019                for (mc = idev->mc_list; mc; mc=mc->next) {
1020                        if (ipv6_addr_equal(&mc->mca_addr, group))
1021                                break;
1022                }
1023                if (mc) {
1024                        if (src_addr && !ipv6_addr_any(src_addr)) {
1025                                struct ip6_sf_list *psf;
1026
1027                                spin_lock_bh(&mc->mca_lock);
1028                                for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1029                                        if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1030                                                break;
1031                                }
1032                                if (psf)
1033                                        rv = psf->sf_count[MCAST_INCLUDE] ||
1034                                                psf->sf_count[MCAST_EXCLUDE] !=
1035                                                mc->mca_sfcount[MCAST_EXCLUDE];
1036                                else
1037                                        rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1038                                spin_unlock_bh(&mc->mca_lock);
1039                        } else
1040                                rv = 1; /* don't filter unspecified source */
1041                }
1042                read_unlock_bh(&idev->lock);
1043                in6_dev_put(idev);
1044        }
1045        return rv;
1046}
1047
1048static void mld_gq_start_timer(struct inet6_dev *idev)
1049{
1050        int tv = net_random() % idev->mc_maxdelay;
1051
1052        idev->mc_gq_running = 1;
1053        if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1054                in6_dev_hold(idev);
1055}
1056
1057static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1058{
1059        int tv = net_random() % delay;
1060
1061        if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1062                in6_dev_hold(idev);
1063}
1064
1065/*
1066 *      IGMP handling (alias multicast ICMPv6 messages)
1067 */
1068
1069static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1070{
1071        unsigned long delay = resptime;
1072
1073        /* Do not start timer for these addresses */
1074        if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1075            IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1076                return;
1077
1078        if (del_timer(&ma->mca_timer)) {
1079                atomic_dec(&ma->mca_refcnt);
1080                delay = ma->mca_timer.expires - jiffies;
1081        }
1082
1083        if (delay >= resptime) {
1084                if (resptime)
1085                        delay = net_random() % resptime;
1086                else
1087                        delay = 1;
1088        }
1089        ma->mca_timer.expires = jiffies + delay;
1090        if (!mod_timer(&ma->mca_timer, jiffies + delay))
1091                atomic_inc(&ma->mca_refcnt);
1092        ma->mca_flags |= MAF_TIMER_RUNNING;
1093}
1094
1095/* mark EXCLUDE-mode sources */
1096static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1097        struct in6_addr *srcs)
1098{
1099        struct ip6_sf_list *psf;
1100        int i, scount;
1101
1102        scount = 0;
1103        for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1104                if (scount == nsrcs)
1105                        break;
1106                for (i=0; i<nsrcs; i++) {
1107                        /* skip inactive filters */
1108                        if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1109                            pmc->mca_sfcount[MCAST_EXCLUDE] !=
1110                            psf->sf_count[MCAST_EXCLUDE])
1111                                continue;
1112                        if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1113                                scount++;
1114                                break;
1115                        }
1116                }
1117        }
1118        pmc->mca_flags &= ~MAF_GSQUERY;
1119        if (scount == nsrcs)    /* all sources excluded */
1120                return 0;
1121        return 1;
1122}
1123
1124static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1125        struct in6_addr *srcs)
1126{
1127        struct ip6_sf_list *psf;
1128        int i, scount;
1129
1130        if (pmc->mca_sfmode == MCAST_EXCLUDE)
1131                return mld_xmarksources(pmc, nsrcs, srcs);
1132
1133        /* mark INCLUDE-mode sources */
1134
1135        scount = 0;
1136        for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1137                if (scount == nsrcs)
1138                        break;
1139                for (i=0; i<nsrcs; i++) {
1140                        if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1141                                psf->sf_gsresp = 1;
1142                                scount++;
1143                                break;
1144                        }
1145                }
1146        }
1147        if (!scount) {
1148                pmc->mca_flags &= ~MAF_GSQUERY;
1149                return 0;
1150        }
1151        pmc->mca_flags |= MAF_GSQUERY;
1152        return 1;
1153}
1154
1155int igmp6_event_query(struct sk_buff *skb)
1156{
1157        struct mld2_query *mlh2 = NULL;
1158        struct ifmcaddr6 *ma;
1159        struct in6_addr *group;
1160        unsigned long max_delay;
1161        struct inet6_dev *idev;
1162        struct icmp6hdr *hdr;
1163        int group_type;
1164        int mark = 0;
1165        int len;
1166
1167        if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1168                return -EINVAL;
1169
1170        /* compute payload length excluding extension headers */
1171        len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1172        len -= skb_network_header_len(skb);
1173
1174        /* Drop queries with not link local source */
1175        if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1176                return -EINVAL;
1177
1178        idev = in6_dev_get(skb->dev);
1179
1180        if (idev == NULL)
1181                return 0;
1182
1183        hdr = icmp6_hdr(skb);
1184        group = (struct in6_addr *) (hdr + 1);
1185        group_type = ipv6_addr_type(group);
1186
1187        if (group_type != IPV6_ADDR_ANY &&
1188            !(group_type&IPV6_ADDR_MULTICAST)) {
1189                in6_dev_put(idev);
1190                return -EINVAL;
1191        }
1192
1193        if (len == 24) {
1194                int switchback;
1195                /* MLDv1 router present */
1196
1197                /* Translate milliseconds to jiffies */
1198                max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1199
1200                switchback = (idev->mc_qrv + 1) * max_delay;
1201                idev->mc_v1_seen = jiffies + switchback;
1202
1203                /* cancel the interface change timer */
1204                idev->mc_ifc_count = 0;
1205                if (del_timer(&idev->mc_ifc_timer))
1206                        __in6_dev_put(idev);
1207                /* clear deleted report items */
1208                mld_clear_delrec(idev);
1209        } else if (len >= 28) {
1210                int srcs_offset = sizeof(struct mld2_query) -
1211                                  sizeof(struct icmp6hdr);
1212                if (!pskb_may_pull(skb, srcs_offset)) {
1213                        in6_dev_put(idev);
1214                        return -EINVAL;
1215                }
1216                mlh2 = (struct mld2_query *)skb_transport_header(skb);
1217                max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1218                if (!max_delay)
1219                        max_delay = 1;
1220                idev->mc_maxdelay = max_delay;
1221                if (mlh2->qrv)
1222                        idev->mc_qrv = mlh2->qrv;
1223                if (group_type == IPV6_ADDR_ANY) { /* general query */
1224                        if (mlh2->nsrcs) {
1225                                in6_dev_put(idev);
1226                                return -EINVAL; /* no sources allowed */
1227                        }
1228                        mld_gq_start_timer(idev);
1229                        in6_dev_put(idev);
1230                        return 0;
1231                }
1232                /* mark sources to include, if group & source-specific */
1233                if (mlh2->nsrcs != 0) {
1234                        if (!pskb_may_pull(skb, srcs_offset +
1235                            ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1236                                in6_dev_put(idev);
1237                                return -EINVAL;
1238                        }
1239                        mlh2 = (struct mld2_query *)skb_transport_header(skb);
1240                        mark = 1;
1241                }
1242        } else {
1243                in6_dev_put(idev);
1244                return -EINVAL;
1245        }
1246
1247        read_lock_bh(&idev->lock);
1248        if (group_type == IPV6_ADDR_ANY) {
1249                for (ma = idev->mc_list; ma; ma=ma->next) {
1250                        spin_lock_bh(&ma->mca_lock);
1251                        igmp6_group_queried(ma, max_delay);
1252                        spin_unlock_bh(&ma->mca_lock);
1253                }
1254        } else {
1255                for (ma = idev->mc_list; ma; ma=ma->next) {
1256                        if (!ipv6_addr_equal(group, &ma->mca_addr))
1257                                continue;
1258                        spin_lock_bh(&ma->mca_lock);
1259                        if (ma->mca_flags & MAF_TIMER_RUNNING) {
1260                                /* gsquery <- gsquery && mark */
1261                                if (!mark)
1262                                        ma->mca_flags &= ~MAF_GSQUERY;
1263                        } else {
1264                                /* gsquery <- mark */
1265                                if (mark)
1266                                        ma->mca_flags |= MAF_GSQUERY;
1267                                else
1268                                        ma->mca_flags &= ~MAF_GSQUERY;
1269                        }
1270                        if (!(ma->mca_flags & MAF_GSQUERY) ||
1271                            mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1272                                igmp6_group_queried(ma, max_delay);
1273                        spin_unlock_bh(&ma->mca_lock);
1274                        break;
1275                }
1276        }
1277        read_unlock_bh(&idev->lock);
1278        in6_dev_put(idev);
1279
1280        return 0;
1281}
1282
1283
1284int igmp6_event_report(struct sk_buff *skb)
1285{
1286        struct ifmcaddr6 *ma;
1287        struct in6_addr *addrp;
1288        struct inet6_dev *idev;
1289        struct icmp6hdr *hdr;
1290        int addr_type;
1291
1292        /* Our own report looped back. Ignore it. */
1293        if (skb->pkt_type == PACKET_LOOPBACK)
1294                return 0;
1295
1296        /* send our report if the MC router may not have heard this report */
1297        if (skb->pkt_type != PACKET_MULTICAST &&
1298            skb->pkt_type != PACKET_BROADCAST)
1299                return 0;
1300
1301        if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1302                return -EINVAL;
1303
1304        hdr = icmp6_hdr(skb);
1305
1306        /* Drop reports with not link local source */
1307        addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1308        if (addr_type != IPV6_ADDR_ANY &&
1309            !(addr_type&IPV6_ADDR_LINKLOCAL))
1310                return -EINVAL;
1311
1312        addrp = (struct in6_addr *) (hdr + 1);
1313
1314        idev = in6_dev_get(skb->dev);
1315        if (idev == NULL)
1316                return -ENODEV;
1317
1318        /*
1319         *      Cancel the timer for this group
1320         */
1321
1322        read_lock_bh(&idev->lock);
1323        for (ma = idev->mc_list; ma; ma=ma->next) {
1324                if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1325                        spin_lock(&ma->mca_lock);
1326                        if (del_timer(&ma->mca_timer))
1327                                atomic_dec(&ma->mca_refcnt);
1328                        ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1329                        spin_unlock(&ma->mca_lock);
1330                        break;
1331                }
1332        }
1333        read_unlock_bh(&idev->lock);
1334        in6_dev_put(idev);
1335        return 0;
1336}
1337
1338static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1339        int gdeleted, int sdeleted)
1340{
1341        switch (type) {
1342        case MLD2_MODE_IS_INCLUDE:
1343        case MLD2_MODE_IS_EXCLUDE:
1344                if (gdeleted || sdeleted)
1345                        return 0;
1346                if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1347                        if (pmc->mca_sfmode == MCAST_INCLUDE)
1348                                return 1;
1349                        /* don't include if this source is excluded
1350                         * in all filters
1351                         */
1352                        if (psf->sf_count[MCAST_INCLUDE])
1353                                return type == MLD2_MODE_IS_INCLUDE;
1354                        return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1355                                psf->sf_count[MCAST_EXCLUDE];
1356                }
1357                return 0;
1358        case MLD2_CHANGE_TO_INCLUDE:
1359                if (gdeleted || sdeleted)
1360                        return 0;
1361                return psf->sf_count[MCAST_INCLUDE] != 0;
1362        case MLD2_CHANGE_TO_EXCLUDE:
1363                if (gdeleted || sdeleted)
1364                        return 0;
1365                if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1366                    psf->sf_count[MCAST_INCLUDE])
1367                        return 0;
1368                return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1369                        psf->sf_count[MCAST_EXCLUDE];
1370        case MLD2_ALLOW_NEW_SOURCES:
1371                if (gdeleted || !psf->sf_crcount)
1372                        return 0;
1373                return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1374        case MLD2_BLOCK_OLD_SOURCES:
1375                if (pmc->mca_sfmode == MCAST_INCLUDE)
1376                        return gdeleted || (psf->sf_crcount && sdeleted);
1377                return psf->sf_crcount && !gdeleted && !sdeleted;
1378        }
1379        return 0;
1380}
1381
1382static int
1383mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1384{
1385        struct ip6_sf_list *psf;
1386        int scount = 0;
1387
1388        for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1389                if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1390                        continue;
1391                scount++;
1392        }
1393        return scount;
1394}
1395
1396static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1397{
1398        struct net *net = dev_net(dev);
1399        struct sock *sk = net->ipv6.igmp_sk;
1400        struct sk_buff *skb;
1401        struct mld2_report *pmr;
1402        struct in6_addr addr_buf;
1403        const struct in6_addr *saddr;
1404        int err;
1405        u8 ra[8] = { IPPROTO_ICMPV6, 0,
1406                     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1407                     IPV6_TLV_PADN, 0 };
1408
1409        /* we assume size > sizeof(ra) here */
1410        skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err);
1411
1412        if (!skb)
1413                return NULL;
1414
1415        skb_reserve(skb, LL_RESERVED_SPACE(dev));
1416
1417        if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1418                /* <draft-ietf-magma-mld-source-05.txt>:
1419                 * use unspecified address as the source address
1420                 * when a valid link-local address is not available.
1421                 */
1422                saddr = &in6addr_any;
1423        } else
1424                saddr = &addr_buf;
1425
1426        ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1427
1428        memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1429
1430        skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1431        skb_put(skb, sizeof(*pmr));
1432        pmr = (struct mld2_report *)skb_transport_header(skb);
1433        pmr->type = ICMPV6_MLD2_REPORT;
1434        pmr->resv1 = 0;
1435        pmr->csum = 0;
1436        pmr->resv2 = 0;
1437        pmr->ngrec = 0;
1438        return skb;
1439}
1440
1441static void mld_sendpack(struct sk_buff *skb)
1442{
1443        struct ipv6hdr *pip6 = ipv6_hdr(skb);
1444        struct mld2_report *pmr =
1445                              (struct mld2_report *)skb_transport_header(skb);
1446        int payload_len, mldlen;
1447        struct inet6_dev *idev = in6_dev_get(skb->dev);
1448        struct net *net = dev_net(skb->dev);
1449        int err;
1450        struct flowi fl;
1451
1452        IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS);
1453        payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1454        mldlen = skb->tail - skb->transport_header;
1455        pip6->payload_len = htons(payload_len);
1456
1457        pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1458                IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1459                                             mldlen, 0));
1460
1461        skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1462
1463        if (!skb->dst) {
1464                err = -ENOMEM;
1465                goto err_out;
1466        }
1467
1468        icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1469                         &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1470                         skb->dev->ifindex);
1471
1472        err = xfrm_lookup(net, &skb->dst, &fl, NULL, 0);
1473        if (err)
1474                goto err_out;
1475
1476        err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1477                      dst_output);
1478out:
1479        if (!err) {
1480                ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1481                ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1482                IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTMCASTPKTS);
1483        } else
1484                IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1485
1486        if (likely(idev != NULL))
1487                in6_dev_put(idev);
1488        return;
1489
1490err_out:
1491        kfree_skb(skb);
1492        goto out;
1493}
1494
1495static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1496{
1497        return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1498}
1499
1500static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1501        int type, struct mld2_grec **ppgr)
1502{
1503        struct net_device *dev = pmc->idev->dev;
1504        struct mld2_report *pmr;
1505        struct mld2_grec *pgr;
1506
1507        if (!skb)
1508                skb = mld_newpack(dev, dev->mtu);
1509        if (!skb)
1510                return NULL;
1511        pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1512        pgr->grec_type = type;
1513        pgr->grec_auxwords = 0;
1514        pgr->grec_nsrcs = 0;
1515        pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1516        pmr = (struct mld2_report *)skb_transport_header(skb);
1517        pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1518        *ppgr = pgr;
1519        return skb;
1520}
1521
1522#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1523        skb_tailroom(skb)) : 0)
1524
1525static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1526        int type, int gdeleted, int sdeleted)
1527{
1528        struct net_device *dev = pmc->idev->dev;
1529        struct mld2_report *pmr;
1530        struct mld2_grec *pgr = NULL;
1531        struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1532        int scount, stotal, first, isquery, truncate;
1533
1534        if (pmc->mca_flags & MAF_NOREPORT)
1535                return skb;
1536
1537        isquery = type == MLD2_MODE_IS_INCLUDE ||
1538                  type == MLD2_MODE_IS_EXCLUDE;
1539        truncate = type == MLD2_MODE_IS_EXCLUDE ||
1540                    type == MLD2_CHANGE_TO_EXCLUDE;
1541
1542        stotal = scount = 0;
1543
1544        psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1545
1546        if (!*psf_list)
1547                goto empty_source;
1548
1549        pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1550
1551        /* EX and TO_EX get a fresh packet, if needed */
1552        if (truncate) {
1553                if (pmr && pmr->ngrec &&
1554                    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1555                        if (skb)
1556                                mld_sendpack(skb);
1557                        skb = mld_newpack(dev, dev->mtu);
1558                }
1559        }
1560        first = 1;
1561        psf_prev = NULL;
1562        for (psf=*psf_list; psf; psf=psf_next) {
1563                struct in6_addr *psrc;
1564
1565                psf_next = psf->sf_next;
1566
1567                if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1568                        psf_prev = psf;
1569                        continue;
1570                }
1571
1572                /* clear marks on query responses */
1573                if (isquery)
1574                        psf->sf_gsresp = 0;
1575
1576                if (AVAILABLE(skb) < sizeof(*psrc) +
1577                    first*sizeof(struct mld2_grec)) {
1578                        if (truncate && !first)
1579                                break;   /* truncate these */
1580                        if (pgr)
1581                                pgr->grec_nsrcs = htons(scount);
1582                        if (skb)
1583                                mld_sendpack(skb);
1584                        skb = mld_newpack(dev, dev->mtu);
1585                        first = 1;
1586                        scount = 0;
1587                }
1588                if (first) {
1589                        skb = add_grhead(skb, pmc, type, &pgr);
1590                        first = 0;
1591                }
1592                if (!skb)
1593                        return NULL;
1594                psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1595                *psrc = psf->sf_addr;
1596                scount++; stotal++;
1597                if ((type == MLD2_ALLOW_NEW_SOURCES ||
1598                     type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1599                        psf->sf_crcount--;
1600                        if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1601                                if (psf_prev)
1602                                        psf_prev->sf_next = psf->sf_next;
1603                                else
1604                                        *psf_list = psf->sf_next;
1605                                kfree(psf);
1606                                continue;
1607                        }
1608                }
1609                psf_prev = psf;
1610        }
1611
1612empty_source:
1613        if (!stotal) {
1614                if (type == MLD2_ALLOW_NEW_SOURCES ||
1615                    type == MLD2_BLOCK_OLD_SOURCES)
1616                        return skb;
1617                if (pmc->mca_crcount || isquery) {
1618                        /* make sure we have room for group header */
1619                        if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1620                                mld_sendpack(skb);
1621                                skb = NULL; /* add_grhead will get a new one */
1622                        }
1623                        skb = add_grhead(skb, pmc, type, &pgr);
1624                }
1625        }
1626        if (pgr)
1627                pgr->grec_nsrcs = htons(scount);
1628
1629        if (isquery)
1630                pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1631        return skb;
1632}
1633
1634static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1635{
1636        struct sk_buff *skb = NULL;
1637        int type;
1638
1639        if (!pmc) {
1640                read_lock_bh(&idev->lock);
1641                for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1642                        if (pmc->mca_flags & MAF_NOREPORT)
1643                                continue;
1644                        spin_lock_bh(&pmc->mca_lock);
1645                        if (pmc->mca_sfcount[MCAST_EXCLUDE])
1646                                type = MLD2_MODE_IS_EXCLUDE;
1647                        else
1648                                type = MLD2_MODE_IS_INCLUDE;
1649                        skb = add_grec(skb, pmc, type, 0, 0);
1650                        spin_unlock_bh(&pmc->mca_lock);
1651                }
1652                read_unlock_bh(&idev->lock);
1653        } else {
1654                spin_lock_bh(&pmc->mca_lock);
1655                if (pmc->mca_sfcount[MCAST_EXCLUDE])
1656                        type = MLD2_MODE_IS_EXCLUDE;
1657                else
1658                        type = MLD2_MODE_IS_INCLUDE;
1659                skb = add_grec(skb, pmc, type, 0, 0);
1660                spin_unlock_bh(&pmc->mca_lock);
1661        }
1662        if (skb)
1663                mld_sendpack(skb);
1664}
1665
1666/*
1667 * remove zero-count source records from a source filter list
1668 */
1669static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1670{
1671        struct ip6_sf_list *psf_prev, *psf_next, *psf;
1672
1673        psf_prev = NULL;
1674        for (psf=*ppsf; psf; psf = psf_next) {
1675                psf_next = psf->sf_next;
1676                if (psf->sf_crcount == 0) {
1677                        if (psf_prev)
1678                                psf_prev->sf_next = psf->sf_next;
1679                        else
1680                                *ppsf = psf->sf_next;
1681                        kfree(psf);
1682                } else
1683                        psf_prev = psf;
1684        }
1685}
1686
1687static void mld_send_cr(struct inet6_dev *idev)
1688{
1689        struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1690        struct sk_buff *skb = NULL;
1691        int type, dtype;
1692
1693        read_lock_bh(&idev->lock);
1694        write_lock_bh(&idev->mc_lock);
1695
1696        /* deleted MCA's */
1697        pmc_prev = NULL;
1698        for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1699                pmc_next = pmc->next;
1700                if (pmc->mca_sfmode == MCAST_INCLUDE) {
1701                        type = MLD2_BLOCK_OLD_SOURCES;
1702                        dtype = MLD2_BLOCK_OLD_SOURCES;
1703                        skb = add_grec(skb, pmc, type, 1, 0);
1704                        skb = add_grec(skb, pmc, dtype, 1, 1);
1705                }
1706                if (pmc->mca_crcount) {
1707                        if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1708                                type = MLD2_CHANGE_TO_INCLUDE;
1709                                skb = add_grec(skb, pmc, type, 1, 0);
1710                        }
1711                        pmc->mca_crcount--;
1712                        if (pmc->mca_crcount == 0) {
1713                                mld_clear_zeros(&pmc->mca_tomb);
1714                                mld_clear_zeros(&pmc->mca_sources);
1715                        }
1716                }
1717                if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1718                    !pmc->mca_sources) {
1719                        if (pmc_prev)
1720                                pmc_prev->next = pmc_next;
1721                        else
1722                                idev->mc_tomb = pmc_next;
1723                        in6_dev_put(pmc->idev);
1724                        kfree(pmc);
1725                } else
1726                        pmc_prev = pmc;
1727        }
1728        write_unlock_bh(&idev->mc_lock);
1729
1730        /* change recs */
1731        for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1732                spin_lock_bh(&pmc->mca_lock);
1733                if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1734                        type = MLD2_BLOCK_OLD_SOURCES;
1735                        dtype = MLD2_ALLOW_NEW_SOURCES;
1736                } else {
1737                        type = MLD2_ALLOW_NEW_SOURCES;
1738                        dtype = MLD2_BLOCK_OLD_SOURCES;
1739                }
1740                skb = add_grec(skb, pmc, type, 0, 0);
1741                skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1742
1743                /* filter mode changes */
1744                if (pmc->mca_crcount) {
1745                        if (pmc->mca_sfmode == MCAST_EXCLUDE)
1746                                type = MLD2_CHANGE_TO_EXCLUDE;
1747                        else
1748                                type = MLD2_CHANGE_TO_INCLUDE;
1749                        skb = add_grec(skb, pmc, type, 0, 0);
1750                        pmc->mca_crcount--;
1751                }
1752                spin_unlock_bh(&pmc->mca_lock);
1753        }
1754        read_unlock_bh(&idev->lock);
1755        if (!skb)
1756                return;
1757        (void) mld_sendpack(skb);
1758}
1759
1760static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1761{
1762        struct net *net = dev_net(dev);
1763        struct sock *sk = net->ipv6.igmp_sk;
1764        struct inet6_dev *idev;
1765        struct sk_buff *skb;
1766        struct icmp6hdr *hdr;
1767        const struct in6_addr *snd_addr, *saddr;
1768        struct in6_addr *addrp;
1769        struct in6_addr addr_buf;
1770        int err, len, payload_len, full_len;
1771        u8 ra[8] = { IPPROTO_ICMPV6, 0,
1772                     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1773                     IPV6_TLV_PADN, 0 };
1774        struct flowi fl;
1775
1776        rcu_read_lock();
1777        IP6_INC_STATS(net, __in6_dev_get(dev),
1778                      IPSTATS_MIB_OUTREQUESTS);
1779        rcu_read_unlock();
1780        if (type == ICMPV6_MGM_REDUCTION)
1781                snd_addr = &in6addr_linklocal_allrouters;
1782        else
1783                snd_addr = addr;
1784
1785        len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1786        payload_len = len + sizeof(ra);
1787        full_len = sizeof(struct ipv6hdr) + payload_len;
1788
1789        skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1790
1791        if (skb == NULL) {
1792                rcu_read_lock();
1793                IP6_INC_STATS(net, __in6_dev_get(dev),
1794                              IPSTATS_MIB_OUTDISCARDS);
1795                rcu_read_unlock();
1796                return;
1797        }
1798
1799        skb_reserve(skb, LL_RESERVED_SPACE(dev));
1800
1801        if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1802                /* <draft-ietf-magma-mld-source-05.txt>:
1803                 * use unspecified address as the source address
1804                 * when a valid link-local address is not available.
1805                 */
1806                saddr = &in6addr_any;
1807        } else
1808                saddr = &addr_buf;
1809
1810        ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1811
1812        memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1813
1814        hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1815        memset(hdr, 0, sizeof(struct icmp6hdr));
1816        hdr->icmp6_type = type;
1817
1818        addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1819        ipv6_addr_copy(addrp, addr);
1820
1821        hdr->icmp6_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1822                                           IPPROTO_ICMPV6,
1823                                           csum_partial(hdr, len, 0));
1824
1825        idev = in6_dev_get(skb->dev);
1826
1827        skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1828        if (!skb->dst) {
1829                err = -ENOMEM;
1830                goto err_out;
1831        }
1832
1833        icmpv6_flow_init(sk, &fl, type,
1834                         &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1835                         skb->dev->ifindex);
1836
1837        err = xfrm_lookup(net, &skb->dst, &fl, NULL, 0);
1838        if (err)
1839                goto err_out;
1840
1841        err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1842                      dst_output);
1843out:
1844        if (!err) {
1845                ICMP6MSGOUT_INC_STATS(net, idev, type);
1846                ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1847                IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTMCASTPKTS);
1848        } else
1849                IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1850
1851        if (likely(idev != NULL))
1852                in6_dev_put(idev);
1853        return;
1854
1855err_out:
1856        kfree_skb(skb);
1857        goto out;
1858}
1859
1860static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1861        struct in6_addr *psfsrc)
1862{
1863        struct ip6_sf_list *psf, *psf_prev;
1864        int rv = 0;
1865
1866        psf_prev = NULL;
1867        for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1868                if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1869                        break;
1870                psf_prev = psf;
1871        }
1872        if (!psf || psf->sf_count[sfmode] == 0) {
1873                /* source filter not found, or count wrong =>  bug */
1874                return -ESRCH;
1875        }
1876        psf->sf_count[sfmode]--;
1877        if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1878                struct inet6_dev *idev = pmc->idev;
1879
1880                /* no more filters for this source */
1881                if (psf_prev)
1882                        psf_prev->sf_next = psf->sf_next;
1883                else
1884                        pmc->mca_sources = psf->sf_next;
1885                if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1886                    !MLD_V1_SEEN(idev)) {
1887                        psf->sf_crcount = idev->mc_qrv;
1888                        psf->sf_next = pmc->mca_tomb;
1889                        pmc->mca_tomb = psf;
1890                        rv = 1;
1891                } else
1892                        kfree(psf);
1893        }
1894        return rv;
1895}
1896
1897static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1898                          int sfmode, int sfcount, struct in6_addr *psfsrc,
1899                          int delta)
1900{
1901        struct ifmcaddr6 *pmc;
1902        int     changerec = 0;
1903        int     i, err;
1904
1905        if (!idev)
1906                return -ENODEV;
1907        read_lock_bh(&idev->lock);
1908        for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1909                if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1910                        break;
1911        }
1912        if (!pmc) {
1913                /* MCA not found?? bug */
1914                read_unlock_bh(&idev->lock);
1915                return -ESRCH;
1916        }
1917        spin_lock_bh(&pmc->mca_lock);
1918        sf_markstate(pmc);
1919        if (!delta) {
1920                if (!pmc->mca_sfcount[sfmode]) {
1921                        spin_unlock_bh(&pmc->mca_lock);
1922                        read_unlock_bh(&idev->lock);
1923                        return -EINVAL;
1924                }
1925                pmc->mca_sfcount[sfmode]--;
1926        }
1927        err = 0;
1928        for (i=0; i<sfcount; i++) {
1929                int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1930
1931                changerec |= rv > 0;
1932                if (!err && rv < 0)
1933                        err = rv;
1934        }
1935        if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1936            pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1937            pmc->mca_sfcount[MCAST_INCLUDE]) {
1938                struct ip6_sf_list *psf;
1939
1940                /* filter mode change */
1941                pmc->mca_sfmode = MCAST_INCLUDE;
1942                pmc->mca_crcount = idev->mc_qrv;
1943                idev->mc_ifc_count = pmc->mca_crcount;
1944                for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1945                        psf->sf_crcount = 0;
1946                mld_ifc_event(pmc->idev);
1947        } else if (sf_setstate(pmc) || changerec)
1948                mld_ifc_event(pmc->idev);
1949        spin_unlock_bh(&pmc->mca_lock);
1950        read_unlock_bh(&idev->lock);
1951        return err;
1952}
1953
1954/*
1955 * Add multicast single-source filter to the interface list
1956 */
1957static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1958        struct in6_addr *psfsrc, int delta)
1959{
1960        struct ip6_sf_list *psf, *psf_prev;
1961
1962        psf_prev = NULL;
1963        for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1964                if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1965                        break;
1966                psf_prev = psf;
1967        }
1968        if (!psf) {
1969                psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1970                if (!psf)
1971                        return -ENOBUFS;
1972
1973                psf->sf_addr = *psfsrc;
1974                if (psf_prev) {
1975                        psf_prev->sf_next = psf;
1976                } else
1977                        pmc->mca_sources = psf;
1978        }
1979        psf->sf_count[sfmode]++;
1980        return 0;
1981}
1982
1983static void sf_markstate(struct ifmcaddr6 *pmc)
1984{
1985        struct ip6_sf_list *psf;
1986        int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1987
1988        for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1989                if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1990                        psf->sf_oldin = mca_xcount ==
1991                                psf->sf_count[MCAST_EXCLUDE] &&
1992                                !psf->sf_count[MCAST_INCLUDE];
1993                } else
1994                        psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1995}
1996
1997static int sf_setstate(struct ifmcaddr6 *pmc)
1998{
1999        struct ip6_sf_list *psf, *dpsf;
2000        int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2001        int qrv = pmc->idev->mc_qrv;
2002        int new_in, rv;
2003
2004        rv = 0;
2005        for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2006                if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2007                        new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2008                                !psf->sf_count[MCAST_INCLUDE];
2009                } else
2010                        new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2011                if (new_in) {
2012                        if (!psf->sf_oldin) {
2013                                struct ip6_sf_list *prev = NULL;
2014
2015                                for (dpsf=pmc->mca_tomb; dpsf;
2016                                     dpsf=dpsf->sf_next) {
2017                                        if (ipv6_addr_equal(&dpsf->sf_addr,
2018                                            &psf->sf_addr))
2019                                                break;
2020                                        prev = dpsf;
2021                                }
2022                                if (dpsf) {
2023                                        if (prev)
2024                                                prev->sf_next = dpsf->sf_next;
2025                                        else
2026                                                pmc->mca_tomb = dpsf->sf_next;
2027                                        kfree(dpsf);
2028                                }
2029                                psf->sf_crcount = qrv;
2030                                rv++;
2031                        }
2032                } else if (psf->sf_oldin) {
2033                        psf->sf_crcount = 0;
2034                        /*
2035                         * add or update "delete" records if an active filter
2036                         * is now inactive
2037                         */
2038                        for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2039                                if (ipv6_addr_equal(&dpsf->sf_addr,
2040                                    &psf->sf_addr))
2041                                        break;
2042                        if (!dpsf) {
2043                                dpsf = (struct ip6_sf_list *)
2044                                        kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2045                                if (!dpsf)
2046                                        continue;
2047                                *dpsf = *psf;
2048                                /* pmc->mca_lock held by callers */
2049                                dpsf->sf_next = pmc->mca_tomb;
2050                                pmc->mca_tomb = dpsf;
2051                        }
2052                        dpsf->sf_crcount = qrv;
2053                        rv++;
2054                }
2055        }
2056        return rv;
2057}
2058
2059/*
2060 * Add multicast source filter list to the interface list
2061 */
2062static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2063                          int sfmode, int sfcount, struct in6_addr *psfsrc,
2064                          int delta)
2065{
2066        struct ifmcaddr6 *pmc;
2067        int     isexclude;
2068        int     i, err;
2069
2070        if (!idev)
2071                return -ENODEV;
2072        read_lock_bh(&idev->lock);
2073        for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2074                if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2075                        break;
2076        }
2077        if (!pmc) {
2078                /* MCA not found?? bug */
2079                read_unlock_bh(&idev->lock);
2080                return -ESRCH;
2081        }
2082        spin_lock_bh(&pmc->mca_lock);
2083
2084        sf_markstate(pmc);
2085        isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2086        if (!delta)
2087                pmc->mca_sfcount[sfmode]++;
2088        err = 0;
2089        for (i=0; i<sfcount; i++) {
2090                err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2091                if (err)
2092                        break;
2093        }
2094        if (err) {
2095                int j;
2096
2097                if (!delta)
2098                        pmc->mca_sfcount[sfmode]--;
2099                for (j=0; j<i; j++)
2100                        (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2101        } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2102                struct inet6_dev *idev = pmc->idev;
2103                struct ip6_sf_list *psf;
2104
2105                /* filter mode change */
2106                if (pmc->mca_sfcount[MCAST_EXCLUDE])
2107                        pmc->mca_sfmode = MCAST_EXCLUDE;
2108                else if (pmc->mca_sfcount[MCAST_INCLUDE])
2109                        pmc->mca_sfmode = MCAST_INCLUDE;
2110                /* else no filters; keep old mode for reports */
2111
2112                pmc->mca_crcount = idev->mc_qrv;
2113                idev->mc_ifc_count = pmc->mca_crcount;
2114                for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2115                        psf->sf_crcount = 0;
2116                mld_ifc_event(idev);
2117        } else if (sf_setstate(pmc))
2118                mld_ifc_event(idev);
2119        spin_unlock_bh(&pmc->mca_lock);
2120        read_unlock_bh(&idev->lock);
2121        return err;
2122}
2123
2124static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2125{
2126        struct ip6_sf_list *psf, *nextpsf;
2127
2128        for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2129                nextpsf = psf->sf_next;
2130                kfree(psf);
2131        }
2132        pmc->mca_tomb = NULL;
2133        for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2134                nextpsf = psf->sf_next;
2135                kfree(psf);
2136        }
2137        pmc->mca_sources = NULL;
2138        pmc->mca_sfmode = MCAST_EXCLUDE;
2139        pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2140        pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2141}
2142
2143
2144static void igmp6_join_group(struct ifmcaddr6 *ma)
2145{
2146        unsigned long delay;
2147
2148        if (ma->mca_flags & MAF_NOREPORT)
2149                return;
2150
2151        igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2152
2153        delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2154
2155        spin_lock_bh(&ma->mca_lock);
2156        if (del_timer(&ma->mca_timer)) {
2157                atomic_dec(&ma->mca_refcnt);
2158                delay = ma->mca_timer.expires - jiffies;
2159        }
2160
2161        if (!mod_timer(&ma->mca_timer, jiffies + delay))
2162                atomic_inc(&ma->mca_refcnt);
2163        ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2164        spin_unlock_bh(&ma->mca_lock);
2165}
2166
2167static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2168                            struct inet6_dev *idev)
2169{
2170        int err;
2171
2172        /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2173         * so no other readers or writers of iml or its sflist
2174         */
2175        if (!iml->sflist) {
2176                /* any-source empty exclude case */
2177                return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2178        }
2179        err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2180                iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2181        sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2182        iml->sflist = NULL;
2183        return err;
2184}
2185
2186static void igmp6_leave_group(struct ifmcaddr6 *ma)
2187{
2188        if (MLD_V1_SEEN(ma->idev)) {
2189                if (ma->mca_flags & MAF_LAST_REPORTER)
2190                        igmp6_send(&ma->mca_addr, ma->idev->dev,
2191                                ICMPV6_MGM_REDUCTION);
2192        } else {
2193                mld_add_delrec(ma->idev, ma);
2194                mld_ifc_event(ma->idev);
2195        }
2196}
2197
2198static void mld_gq_timer_expire(unsigned long data)
2199{
2200        struct inet6_dev *idev = (struct inet6_dev *)data;
2201
2202        idev->mc_gq_running = 0;
2203        mld_send_report(idev, NULL);
2204        __in6_dev_put(idev);
2205}
2206
2207static void mld_ifc_timer_expire(unsigned long data)
2208{
2209        struct inet6_dev *idev = (struct inet6_dev *)data;
2210
2211        mld_send_cr(idev);
2212        if (idev->mc_ifc_count) {
2213                idev->mc_ifc_count--;
2214                if (idev->mc_ifc_count)
2215                        mld_ifc_start_timer(idev, idev->mc_maxdelay);
2216        }
2217        __in6_dev_put(idev);
2218}
2219
2220static void mld_ifc_event(struct inet6_dev *idev)
2221{
2222        if (MLD_V1_SEEN(idev))
2223                return;
2224        idev->mc_ifc_count = idev->mc_qrv;
2225        mld_ifc_start_timer(idev, 1);
2226}
2227
2228
2229static void igmp6_timer_handler(unsigned long data)
2230{
2231        struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2232
2233        if (MLD_V1_SEEN(ma->idev))
2234                igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2235        else
2236                mld_send_report(ma->idev, ma);
2237
2238        spin_lock(&ma->mca_lock);
2239        ma->mca_flags |=  MAF_LAST_REPORTER;
2240        ma->mca_flags &= ~MAF_TIMER_RUNNING;
2241        spin_unlock(&ma->mca_lock);
2242        ma_put(ma);
2243}
2244
2245/* Device going down */
2246
2247void ipv6_mc_down(struct inet6_dev *idev)
2248{
2249        struct ifmcaddr6 *i;
2250
2251        /* Withdraw multicast list */
2252
2253        read_lock_bh(&idev->lock);
2254        idev->mc_ifc_count = 0;
2255        if (del_timer(&idev->mc_ifc_timer))
2256                __in6_dev_put(idev);
2257        idev->mc_gq_running = 0;
2258        if (del_timer(&idev->mc_gq_timer))
2259                __in6_dev_put(idev);
2260
2261        for (i = idev->mc_list; i; i=i->next)
2262                igmp6_group_dropped(i);
2263        read_unlock_bh(&idev->lock);
2264
2265        mld_clear_delrec(idev);
2266}
2267
2268
2269/* Device going up */
2270
2271void ipv6_mc_up(struct inet6_dev *idev)
2272{
2273        struct ifmcaddr6 *i;
2274
2275        /* Install multicast list, except for all-nodes (already installed) */
2276
2277        read_lock_bh(&idev->lock);
2278        for (i = idev->mc_list; i; i=i->next)
2279                igmp6_group_added(i);
2280        read_unlock_bh(&idev->lock);
2281}
2282
2283/* IPv6 device initialization. */
2284
2285void ipv6_mc_init_dev(struct inet6_dev *idev)
2286{
2287        write_lock_bh(&idev->lock);
2288        rwlock_init(&idev->mc_lock);
2289        idev->mc_gq_running = 0;
2290        setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2291                        (unsigned long)idev);
2292        idev->mc_tomb = NULL;
2293        idev->mc_ifc_count = 0;
2294        setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2295                        (unsigned long)idev);
2296        idev->mc_qrv = MLD_QRV_DEFAULT;
2297        idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2298        idev->mc_v1_seen = 0;
2299        write_unlock_bh(&idev->lock);
2300}
2301
2302/*
2303 *      Device is about to be destroyed: clean up.
2304 */
2305
2306void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2307{
2308        struct ifmcaddr6 *i;
2309
2310        /* Deactivate timers */
2311        ipv6_mc_down(idev);
2312
2313        /* Delete all-nodes address. */
2314        /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2315         * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2316         * fail.
2317         */
2318        __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2319
2320        if (idev->cnf.forwarding)
2321                __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2322
2323        write_lock_bh(&idev->lock);
2324        while ((i = idev->mc_list) != NULL) {
2325                idev->mc_list = i->next;
2326                write_unlock_bh(&idev->lock);
2327
2328                igmp6_group_dropped(i);
2329                ma_put(i);
2330
2331                write_lock_bh(&idev->lock);
2332        }
2333        write_unlock_bh(&idev->lock);
2334}
2335
2336#ifdef CONFIG_PROC_FS
2337struct igmp6_mc_iter_state {
2338        struct seq_net_private p;
2339        struct net_device *dev;
2340        struct inet6_dev *idev;
2341};
2342
2343#define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2344
2345static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2346{
2347        struct ifmcaddr6 *im = NULL;
2348        struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2349        struct net *net = seq_file_net(seq);
2350
2351        state->idev = NULL;
2352        for_each_netdev(net, state->dev) {
2353                struct inet6_dev *idev;
2354                idev = in6_dev_get(state->dev);
2355                if (!idev)
2356                        continue;
2357                read_lock_bh(&idev->lock);
2358                im = idev->mc_list;
2359                if (im) {
2360                        state->idev = idev;
2361                        break;
2362                }
2363                read_unlock_bh(&idev->lock);
2364                in6_dev_put(idev);
2365        }
2366        return im;
2367}
2368
2369static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2370{
2371        struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2372
2373        im = im->next;
2374        while (!im) {
2375                if (likely(state->idev != NULL)) {
2376                        read_unlock_bh(&state->idev->lock);
2377                        in6_dev_put(state->idev);
2378                }
2379                state->dev = next_net_device(state->dev);
2380                if (!state->dev) {
2381                        state->idev = NULL;
2382                        break;
2383                }
2384                state->idev = in6_dev_get(state->dev);
2385                if (!state->idev)
2386                        continue;
2387                read_lock_bh(&state->idev->lock);
2388                im = state->idev->mc_list;
2389        }
2390        return im;
2391}
2392
2393static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2394{
2395        struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2396        if (im)
2397                while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2398                        --pos;
2399        return pos ? NULL : im;
2400}
2401
2402static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2403        __acquires(dev_base_lock)
2404{
2405        read_lock(&dev_base_lock);
2406        return igmp6_mc_get_idx(seq, *pos);
2407}
2408
2409static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2410{
2411        struct ifmcaddr6 *im;
2412        im = igmp6_mc_get_next(seq, v);
2413        ++*pos;
2414        return im;
2415}
2416
2417static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2418        __releases(dev_base_lock)
2419{
2420        struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2421        if (likely(state->idev != NULL)) {
2422                read_unlock_bh(&state->idev->lock);
2423                in6_dev_put(state->idev);
2424                state->idev = NULL;
2425        }
2426        state->dev = NULL;
2427        read_unlock(&dev_base_lock);
2428}
2429
2430static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2431{
2432        struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2433        struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2434
2435        seq_printf(seq,
2436                   "%-4d %-15s %pi6 %5d %08X %ld\n",
2437                   state->dev->ifindex, state->dev->name,
2438                   &im->mca_addr,
2439                   im->mca_users, im->mca_flags,
2440                   (im->mca_flags&MAF_TIMER_RUNNING) ?
2441                   jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2442        return 0;
2443}
2444
2445static const struct seq_operations igmp6_mc_seq_ops = {
2446        .start  =       igmp6_mc_seq_start,
2447        .next   =       igmp6_mc_seq_next,
2448        .stop   =       igmp6_mc_seq_stop,
2449        .show   =       igmp6_mc_seq_show,
2450};
2451
2452static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2453{
2454        return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2455                            sizeof(struct igmp6_mc_iter_state));
2456}
2457
2458static const struct file_operations igmp6_mc_seq_fops = {
2459        .owner          =       THIS_MODULE,
2460        .open           =       igmp6_mc_seq_open,
2461        .read           =       seq_read,
2462        .llseek         =       seq_lseek,
2463        .release        =       seq_release_net,
2464};
2465
2466struct igmp6_mcf_iter_state {
2467        struct seq_net_private p;
2468        struct net_device *dev;
2469        struct inet6_dev *idev;
2470        struct ifmcaddr6 *im;
2471};
2472
2473#define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2474
2475static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2476{
2477        struct ip6_sf_list *psf = NULL;
2478        struct ifmcaddr6 *im = NULL;
2479        struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2480        struct net *net = seq_file_net(seq);
2481
2482        state->idev = NULL;
2483        state->im = NULL;
2484        for_each_netdev(net, state->dev) {
2485                struct inet6_dev *idev;
2486                idev = in6_dev_get(state->dev);
2487                if (unlikely(idev == NULL))
2488                        continue;
2489                read_lock_bh(&idev->lock);
2490                im = idev->mc_list;
2491                if (likely(im != NULL)) {
2492                        spin_lock_bh(&im->mca_lock);
2493                        psf = im->mca_sources;
2494                        if (likely(psf != NULL)) {
2495                                state->im = im;
2496                                state->idev = idev;
2497                                break;
2498                        }
2499                        spin_unlock_bh(&im->mca_lock);
2500                }
2501                read_unlock_bh(&idev->lock);
2502                in6_dev_put(idev);
2503        }
2504        return psf;
2505}
2506
2507static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2508{
2509        struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2510
2511        psf = psf->sf_next;
2512        while (!psf) {
2513                spin_unlock_bh(&state->im->mca_lock);
2514                state->im = state->im->next;
2515                while (!state->im) {
2516                        if (likely(state->idev != NULL)) {
2517                                read_unlock_bh(&state->idev->lock);
2518                                in6_dev_put(state->idev);
2519                        }
2520                        state->dev = next_net_device(state->dev);
2521                        if (!state->dev) {
2522                                state->idev = NULL;
2523                                goto out;
2524                        }
2525                        state->idev = in6_dev_get(state->dev);
2526                        if (!state->idev)
2527                                continue;
2528                        read_lock_bh(&state->idev->lock);
2529                        state->im = state->idev->mc_list;
2530                }
2531                if (!state->im)
2532                        break;
2533                spin_lock_bh(&state->im->mca_lock);
2534                psf = state->im->mca_sources;
2535        }
2536out:
2537        return psf;
2538}
2539
2540static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2541{
2542        struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2543        if (psf)
2544                while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2545                        --pos;
2546        return pos ? NULL : psf;
2547}
2548
2549static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2550        __acquires(dev_base_lock)
2551{
2552        read_lock(&dev_base_lock);
2553        return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2554}
2555
2556static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2557{
2558        struct ip6_sf_list *psf;
2559        if (v == SEQ_START_TOKEN)
2560                psf = igmp6_mcf_get_first(seq);
2561        else
2562                psf = igmp6_mcf_get_next(seq, v);
2563        ++*pos;
2564        return psf;
2565}
2566
2567static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2568        __releases(dev_base_lock)
2569{
2570        struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2571        if (likely(state->im != NULL)) {
2572                spin_unlock_bh(&state->im->mca_lock);
2573                state->im = NULL;
2574        }
2575        if (likely(state->idev != NULL)) {
2576                read_unlock_bh(&state->idev->lock);
2577                in6_dev_put(state->idev);
2578                state->idev = NULL;
2579        }
2580        state->dev = NULL;
2581        read_unlock(&dev_base_lock);
2582}
2583
2584static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2585{
2586        struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2587        struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2588
2589        if (v == SEQ_START_TOKEN) {
2590                seq_printf(seq,
2591                           "%3s %6s "
2592                           "%32s %32s %6s %6s\n", "Idx",
2593                           "Device", "Multicast Address",
2594                           "Source Address", "INC", "EXC");
2595        } else {
2596                seq_printf(seq,
2597                           "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2598                           state->dev->ifindex, state->dev->name,
2599                           &state->im->mca_addr,
2600                           &psf->sf_addr,
2601                           psf->sf_count[MCAST_INCLUDE],
2602                           psf->sf_count[MCAST_EXCLUDE]);
2603        }
2604        return 0;
2605}
2606
2607static const struct seq_operations igmp6_mcf_seq_ops = {
2608        .start  =       igmp6_mcf_seq_start,
2609        .next   =       igmp6_mcf_seq_next,
2610        .stop   =       igmp6_mcf_seq_stop,
2611        .show   =       igmp6_mcf_seq_show,
2612};
2613
2614static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2615{
2616        return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2617                            sizeof(struct igmp6_mcf_iter_state));
2618}
2619
2620static const struct file_operations igmp6_mcf_seq_fops = {
2621        .owner          =       THIS_MODULE,
2622        .open           =       igmp6_mcf_seq_open,
2623        .read           =       seq_read,
2624        .llseek         =       seq_lseek,
2625        .release        =       seq_release_net,
2626};
2627
2628static int igmp6_proc_init(struct net *net)
2629{
2630        int err;
2631
2632        err = -ENOMEM;
2633        if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2634                goto out;
2635        if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2636                                  &igmp6_mcf_seq_fops))
2637                goto out_proc_net_igmp6;
2638
2639        err = 0;
2640out:
2641        return err;
2642
2643out_proc_net_igmp6:
2644        proc_net_remove(net, "igmp6");
2645        goto out;
2646}
2647
2648static void igmp6_proc_exit(struct net *net)
2649{
2650        proc_net_remove(net, "mcfilter6");
2651        proc_net_remove(net, "igmp6");
2652}
2653#else
2654static int igmp6_proc_init(struct net *net)
2655{
2656        return 0;
2657}
2658static void igmp6_proc_exit(struct net *net)
2659{
2660        ;
2661}
2662#endif
2663
2664static int igmp6_net_init(struct net *net)
2665{
2666        int err;
2667
2668        err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2669                                   SOCK_RAW, IPPROTO_ICMPV6, net);
2670        if (err < 0) {
2671                printk(KERN_ERR
2672                       "Failed to initialize the IGMP6 control socket (err %d).\n",
2673                       err);
2674                goto out;
2675        }
2676
2677        inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2678
2679        err = igmp6_proc_init(net);
2680        if (err)
2681                goto out_sock_create;
2682out:
2683        return err;
2684
2685out_sock_create:
2686        inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2687        goto out;
2688}
2689
2690static void igmp6_net_exit(struct net *net)
2691{
2692        inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2693        igmp6_proc_exit(net);
2694}
2695
2696static struct pernet_operations igmp6_net_ops = {
2697        .init = igmp6_net_init,
2698        .exit = igmp6_net_exit,
2699};
2700
2701int __init igmp6_init(void)
2702{
2703        return register_pernet_subsys(&igmp6_net_ops);
2704}
2705
2706void igmp6_cleanup(void)
2707{
2708        unregister_pernet_subsys(&igmp6_net_ops);
2709}
2710