linux/net/ipv6/mcast.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *      Multicast support for IPv6
   4 *      Linux INET6 implementation
   5 *
   6 *      Authors:
   7 *      Pedro Roque             <roque@di.fc.ul.pt>
   8 *
   9 *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
  10 */
  11
  12/* Changes:
  13 *
  14 *      yoshfuji        : fix format of router-alert option
  15 *      YOSHIFUJI Hideaki @USAGI:
  16 *              Fixed source address for MLD message based on
  17 *              <draft-ietf-magma-mld-source-05.txt>.
  18 *      YOSHIFUJI Hideaki @USAGI:
  19 *              - Ignore Queries for invalid addresses.
  20 *              - MLD for link-local addresses.
  21 *      David L Stevens <dlstevens@us.ibm.com>:
  22 *              - MLDv2 support
  23 */
  24
  25#include <linux/module.h>
  26#include <linux/errno.h>
  27#include <linux/types.h>
  28#include <linux/string.h>
  29#include <linux/socket.h>
  30#include <linux/sockios.h>
  31#include <linux/jiffies.h>
  32#include <linux/net.h>
  33#include <linux/in.h>
  34#include <linux/in6.h>
  35#include <linux/netdevice.h>
  36#include <linux/if_arp.h>
  37#include <linux/route.h>
  38#include <linux/init.h>
  39#include <linux/proc_fs.h>
  40#include <linux/seq_file.h>
  41#include <linux/slab.h>
  42#include <linux/pkt_sched.h>
  43#include <net/mld.h>
  44#include <linux/workqueue.h>
  45
  46#include <linux/netfilter.h>
  47#include <linux/netfilter_ipv6.h>
  48
  49#include <net/net_namespace.h>
  50#include <net/sock.h>
  51#include <net/snmp.h>
  52
  53#include <net/ipv6.h>
  54#include <net/protocol.h>
  55#include <net/if_inet6.h>
  56#include <net/ndisc.h>
  57#include <net/addrconf.h>
  58#include <net/ip6_route.h>
  59#include <net/inet_common.h>
  60
  61#include <net/ip6_checksum.h>
  62
  63/* Ensure that we have struct in6_addr aligned on 32bit word. */
  64static int __mld2_query_bugs[] __attribute__((__unused__)) = {
  65        BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
  66        BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
  67        BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4)
  68};
  69
  70static struct workqueue_struct *mld_wq;
  71static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  72
  73static void igmp6_join_group(struct ifmcaddr6 *ma);
  74static void igmp6_leave_group(struct ifmcaddr6 *ma);
  75static void mld_mca_work(struct work_struct *work);
  76
  77static void mld_ifc_event(struct inet6_dev *idev);
  78static bool mld_in_v1_mode(const struct inet6_dev *idev);
  79static int sf_setstate(struct ifmcaddr6 *pmc);
  80static void sf_markstate(struct ifmcaddr6 *pmc);
  81static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
  82static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  83                          int sfmode, int sfcount, const struct in6_addr *psfsrc,
  84                          int delta);
  85static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  86                          int sfmode, int sfcount, const struct in6_addr *psfsrc,
  87                          int delta);
  88static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
  89                            struct inet6_dev *idev);
  90static int __ipv6_dev_mc_inc(struct net_device *dev,
  91                             const struct in6_addr *addr, unsigned int mode);
  92
  93#define MLD_QRV_DEFAULT         2
  94/* RFC3810, 9.2. Query Interval */
  95#define MLD_QI_DEFAULT          (125 * HZ)
  96/* RFC3810, 9.3. Query Response Interval */
  97#define MLD_QRI_DEFAULT         (10 * HZ)
  98
  99/* RFC3810, 8.1 Query Version Distinctions */
 100#define MLD_V1_QUERY_LEN        24
 101#define MLD_V2_QUERY_LEN_MIN    28
 102
 103#define IPV6_MLD_MAX_MSF        64
 104
 105int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 106int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
 107
 108/*
 109 *      socket join on multicast group
 110 */
 111#define mc_dereference(e, idev) \
 112        rcu_dereference_protected(e, lockdep_is_held(&(idev)->mc_lock))
 113
 114#define sock_dereference(e, sk) \
 115        rcu_dereference_protected(e, lockdep_sock_is_held(sk))
 116
 117#define for_each_pmc_socklock(np, sk, pmc)                      \
 118        for (pmc = sock_dereference((np)->ipv6_mc_list, sk);    \
 119             pmc;                                               \
 120             pmc = sock_dereference(pmc->next, sk))
 121
 122#define for_each_pmc_rcu(np, pmc)                               \
 123        for (pmc = rcu_dereference((np)->ipv6_mc_list);         \
 124             pmc;                                               \
 125             pmc = rcu_dereference(pmc->next))
 126
 127#define for_each_psf_mclock(mc, psf)                            \
 128        for (psf = mc_dereference((mc)->mca_sources, mc->idev); \
 129             psf;                                               \
 130             psf = mc_dereference(psf->sf_next, mc->idev))
 131
 132#define for_each_psf_rcu(mc, psf)                               \
 133        for (psf = rcu_dereference((mc)->mca_sources);          \
 134             psf;                                               \
 135             psf = rcu_dereference(psf->sf_next))
 136
 137#define for_each_psf_tomb(mc, psf)                              \
 138        for (psf = mc_dereference((mc)->mca_tomb, mc->idev);    \
 139             psf;                                               \
 140             psf = mc_dereference(psf->sf_next, mc->idev))
 141
 142#define for_each_mc_mclock(idev, mc)                            \
 143        for (mc = mc_dereference((idev)->mc_list, idev);        \
 144             mc;                                                \
 145             mc = mc_dereference(mc->next, idev))
 146
 147#define for_each_mc_rcu(idev, mc)                               \
 148        for (mc = rcu_dereference((idev)->mc_list);             \
 149             mc;                                                \
 150             mc = rcu_dereference(mc->next))
 151
 152#define for_each_mc_tomb(idev, mc)                              \
 153        for (mc = mc_dereference((idev)->mc_tomb, idev);        \
 154             mc;                                                \
 155             mc = mc_dereference(mc->next, idev))
 156
 157static int unsolicited_report_interval(struct inet6_dev *idev)
 158{
 159        int iv;
 160
 161        if (mld_in_v1_mode(idev))
 162                iv = idev->cnf.mldv1_unsolicited_report_interval;
 163        else
 164                iv = idev->cnf.mldv2_unsolicited_report_interval;
 165
 166        return iv > 0 ? iv : 1;
 167}
 168
 169static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
 170                               const struct in6_addr *addr, unsigned int mode)
 171{
 172        struct net_device *dev = NULL;
 173        struct ipv6_mc_socklist *mc_lst;
 174        struct ipv6_pinfo *np = inet6_sk(sk);
 175        struct net *net = sock_net(sk);
 176        int err;
 177
 178        ASSERT_RTNL();
 179
 180        if (!ipv6_addr_is_multicast(addr))
 181                return -EINVAL;
 182
 183        for_each_pmc_socklock(np, sk, mc_lst) {
 184                if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 185                    ipv6_addr_equal(&mc_lst->addr, addr))
 186                        return -EADDRINUSE;
 187        }
 188
 189        mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 190
 191        if (!mc_lst)
 192                return -ENOMEM;
 193
 194        mc_lst->next = NULL;
 195        mc_lst->addr = *addr;
 196
 197        if (ifindex == 0) {
 198                struct rt6_info *rt;
 199                rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
 200                if (rt) {
 201                        dev = rt->dst.dev;
 202                        ip6_rt_put(rt);
 203                }
 204        } else
 205                dev = __dev_get_by_index(net, ifindex);
 206
 207        if (!dev) {
 208                sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 209                return -ENODEV;
 210        }
 211
 212        mc_lst->ifindex = dev->ifindex;
 213        mc_lst->sfmode = mode;
 214        RCU_INIT_POINTER(mc_lst->sflist, NULL);
 215
 216        /*
 217         *      now add/increase the group membership on the device
 218         */
 219
 220        err = __ipv6_dev_mc_inc(dev, addr, mode);
 221
 222        if (err) {
 223                sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 224                return err;
 225        }
 226
 227        mc_lst->next = np->ipv6_mc_list;
 228        rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 229
 230        return 0;
 231}
 232
 233int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 234{
 235        return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
 236}
 237EXPORT_SYMBOL(ipv6_sock_mc_join);
 238
 239int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
 240                          const struct in6_addr *addr, unsigned int mode)
 241{
 242        return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
 243}
 244
 245/*
 246 *      socket leave on multicast group
 247 */
 248int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 249{
 250        struct ipv6_pinfo *np = inet6_sk(sk);
 251        struct ipv6_mc_socklist *mc_lst;
 252        struct ipv6_mc_socklist __rcu **lnk;
 253        struct net *net = sock_net(sk);
 254
 255        ASSERT_RTNL();
 256
 257        if (!ipv6_addr_is_multicast(addr))
 258                return -EINVAL;
 259
 260        for (lnk = &np->ipv6_mc_list;
 261             (mc_lst = sock_dereference(*lnk, sk)) != NULL;
 262              lnk = &mc_lst->next) {
 263                if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 264                    ipv6_addr_equal(&mc_lst->addr, addr)) {
 265                        struct net_device *dev;
 266
 267                        *lnk = mc_lst->next;
 268
 269                        dev = __dev_get_by_index(net, mc_lst->ifindex);
 270                        if (dev) {
 271                                struct inet6_dev *idev = __in6_dev_get(dev);
 272
 273                                ip6_mc_leave_src(sk, mc_lst, idev);
 274                                if (idev)
 275                                        __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 276                        } else {
 277                                ip6_mc_leave_src(sk, mc_lst, NULL);
 278                        }
 279
 280                        atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 281                        kfree_rcu(mc_lst, rcu);
 282                        return 0;
 283                }
 284        }
 285
 286        return -EADDRNOTAVAIL;
 287}
 288EXPORT_SYMBOL(ipv6_sock_mc_drop);
 289
 290static struct inet6_dev *ip6_mc_find_dev_rtnl(struct net *net,
 291                                              const struct in6_addr *group,
 292                                              int ifindex)
 293{
 294        struct net_device *dev = NULL;
 295        struct inet6_dev *idev = NULL;
 296
 297        if (ifindex == 0) {
 298                struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
 299
 300                if (rt) {
 301                        dev = rt->dst.dev;
 302                        ip6_rt_put(rt);
 303                }
 304        } else {
 305                dev = __dev_get_by_index(net, ifindex);
 306        }
 307
 308        if (!dev)
 309                return NULL;
 310        idev = __in6_dev_get(dev);
 311        if (!idev)
 312                return NULL;
 313        if (idev->dead)
 314                return NULL;
 315        return idev;
 316}
 317
 318void __ipv6_sock_mc_close(struct sock *sk)
 319{
 320        struct ipv6_pinfo *np = inet6_sk(sk);
 321        struct ipv6_mc_socklist *mc_lst;
 322        struct net *net = sock_net(sk);
 323
 324        ASSERT_RTNL();
 325
 326        while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) {
 327                struct net_device *dev;
 328
 329                np->ipv6_mc_list = mc_lst->next;
 330
 331                dev = __dev_get_by_index(net, mc_lst->ifindex);
 332                if (dev) {
 333                        struct inet6_dev *idev = __in6_dev_get(dev);
 334
 335                        ip6_mc_leave_src(sk, mc_lst, idev);
 336                        if (idev)
 337                                __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 338                } else {
 339                        ip6_mc_leave_src(sk, mc_lst, NULL);
 340                }
 341
 342                atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 343                kfree_rcu(mc_lst, rcu);
 344        }
 345}
 346
 347void ipv6_sock_mc_close(struct sock *sk)
 348{
 349        struct ipv6_pinfo *np = inet6_sk(sk);
 350
 351        if (!rcu_access_pointer(np->ipv6_mc_list))
 352                return;
 353
 354        rtnl_lock();
 355        lock_sock(sk);
 356        __ipv6_sock_mc_close(sk);
 357        release_sock(sk);
 358        rtnl_unlock();
 359}
 360
 361int ip6_mc_source(int add, int omode, struct sock *sk,
 362        struct group_source_req *pgsr)
 363{
 364        struct in6_addr *source, *group;
 365        struct ipv6_mc_socklist *pmc;
 366        struct inet6_dev *idev;
 367        struct ipv6_pinfo *inet6 = inet6_sk(sk);
 368        struct ip6_sf_socklist *psl;
 369        struct net *net = sock_net(sk);
 370        int i, j, rv;
 371        int leavegroup = 0;
 372        int err;
 373
 374        source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 375        group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 376
 377        if (!ipv6_addr_is_multicast(group))
 378                return -EINVAL;
 379
 380        idev = ip6_mc_find_dev_rtnl(net, group, pgsr->gsr_interface);
 381        if (!idev)
 382                return -ENODEV;
 383
 384        err = -EADDRNOTAVAIL;
 385
 386        mutex_lock(&idev->mc_lock);
 387        for_each_pmc_socklock(inet6, sk, pmc) {
 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 (rcu_access_pointer(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        psl = sock_dereference(pmc->sflist, sk);
 411        if (!add) {
 412                if (!psl)
 413                        goto done;      /* err = -EADDRNOTAVAIL */
 414                rv = !0;
 415                for (i = 0; i < psl->sl_count; i++) {
 416                        rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 417                        if (rv == 0)
 418                                break;
 419                }
 420                if (rv)         /* source not found */
 421                        goto done;      /* err = -EADDRNOTAVAIL */
 422
 423                /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 424                if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 425                        leavegroup = 1;
 426                        goto done;
 427                }
 428
 429                /* update the interface filter */
 430                ip6_mc_del_src(idev, group, omode, 1, source, 1);
 431
 432                for (j = i+1; j < psl->sl_count; j++)
 433                        psl->sl_addr[j-1] = psl->sl_addr[j];
 434                psl->sl_count--;
 435                err = 0;
 436                goto done;
 437        }
 438        /* else, add a new source to the filter */
 439
 440        if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 441                err = -ENOBUFS;
 442                goto done;
 443        }
 444        if (!psl || psl->sl_count == psl->sl_max) {
 445                struct ip6_sf_socklist *newpsl;
 446                int count = IP6_SFBLOCK;
 447
 448                if (psl)
 449                        count += psl->sl_max;
 450                newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_KERNEL);
 451                if (!newpsl) {
 452                        err = -ENOBUFS;
 453                        goto done;
 454                }
 455                newpsl->sl_max = count;
 456                newpsl->sl_count = count - IP6_SFBLOCK;
 457                if (psl) {
 458                        for (i = 0; i < psl->sl_count; i++)
 459                                newpsl->sl_addr[i] = psl->sl_addr[i];
 460                        atomic_sub(IP6_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
 461                        kfree_rcu(psl, rcu);
 462                }
 463                psl = newpsl;
 464                rcu_assign_pointer(pmc->sflist, psl);
 465        }
 466        rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 467        for (i = 0; i < psl->sl_count; i++) {
 468                rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 469                if (rv == 0) /* There is an error in the address. */
 470                        goto done;
 471        }
 472        for (j = psl->sl_count-1; j >= i; j--)
 473                psl->sl_addr[j+1] = psl->sl_addr[j];
 474        psl->sl_addr[i] = *source;
 475        psl->sl_count++;
 476        err = 0;
 477        /* update the interface list */
 478        ip6_mc_add_src(idev, group, omode, 1, source, 1);
 479done:
 480        mutex_unlock(&idev->mc_lock);
 481        if (leavegroup)
 482                err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 483        return err;
 484}
 485
 486int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
 487                    struct sockaddr_storage *list)
 488{
 489        const struct in6_addr *group;
 490        struct ipv6_mc_socklist *pmc;
 491        struct inet6_dev *idev;
 492        struct ipv6_pinfo *inet6 = inet6_sk(sk);
 493        struct ip6_sf_socklist *newpsl, *psl;
 494        struct net *net = sock_net(sk);
 495        int leavegroup = 0;
 496        int i, err;
 497
 498        group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 499
 500        if (!ipv6_addr_is_multicast(group))
 501                return -EINVAL;
 502        if (gsf->gf_fmode != MCAST_INCLUDE &&
 503            gsf->gf_fmode != MCAST_EXCLUDE)
 504                return -EINVAL;
 505
 506        idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface);
 507        if (!idev)
 508                return -ENODEV;
 509
 510        err = 0;
 511
 512        if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 513                leavegroup = 1;
 514                goto done;
 515        }
 516
 517        for_each_pmc_socklock(inet6, sk, pmc) {
 518                if (pmc->ifindex != gsf->gf_interface)
 519                        continue;
 520                if (ipv6_addr_equal(&pmc->addr, group))
 521                        break;
 522        }
 523        if (!pmc) {             /* must have a prior join */
 524                err = -EINVAL;
 525                goto done;
 526        }
 527        if (gsf->gf_numsrc) {
 528                newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 529                                                          GFP_KERNEL);
 530                if (!newpsl) {
 531                        err = -ENOBUFS;
 532                        goto done;
 533                }
 534                newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 535                for (i = 0; i < newpsl->sl_count; ++i, ++list) {
 536                        struct sockaddr_in6 *psin6;
 537
 538                        psin6 = (struct sockaddr_in6 *)list;
 539                        newpsl->sl_addr[i] = psin6->sin6_addr;
 540                }
 541                mutex_lock(&idev->mc_lock);
 542                err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 543                                     newpsl->sl_count, newpsl->sl_addr, 0);
 544                if (err) {
 545                        mutex_unlock(&idev->mc_lock);
 546                        sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 547                        goto done;
 548                }
 549                mutex_unlock(&idev->mc_lock);
 550        } else {
 551                newpsl = NULL;
 552                mutex_lock(&idev->mc_lock);
 553                ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 554                mutex_unlock(&idev->mc_lock);
 555        }
 556
 557        mutex_lock(&idev->mc_lock);
 558        psl = sock_dereference(pmc->sflist, sk);
 559        if (psl) {
 560                ip6_mc_del_src(idev, group, pmc->sfmode,
 561                               psl->sl_count, psl->sl_addr, 0);
 562                atomic_sub(IP6_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
 563                kfree_rcu(psl, rcu);
 564        } else {
 565                ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 566        }
 567        mutex_unlock(&idev->mc_lock);
 568        rcu_assign_pointer(pmc->sflist, newpsl);
 569        pmc->sfmode = gsf->gf_fmode;
 570        err = 0;
 571done:
 572        if (leavegroup)
 573                err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 574        return err;
 575}
 576
 577int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 578                  struct sockaddr_storage __user *p)
 579{
 580        struct ipv6_pinfo *inet6 = inet6_sk(sk);
 581        const struct in6_addr *group;
 582        struct ipv6_mc_socklist *pmc;
 583        struct ip6_sf_socklist *psl;
 584        int i, count, copycount;
 585
 586        group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 587
 588        if (!ipv6_addr_is_multicast(group))
 589                return -EINVAL;
 590
 591        /* changes to the ipv6_mc_list require the socket lock and
 592         * rtnl lock. We have the socket lock, so reading the list is safe.
 593         */
 594
 595        for_each_pmc_socklock(inet6, sk, pmc) {
 596                if (pmc->ifindex != gsf->gf_interface)
 597                        continue;
 598                if (ipv6_addr_equal(group, &pmc->addr))
 599                        break;
 600        }
 601        if (!pmc)               /* must have a prior join */
 602                return -EADDRNOTAVAIL;
 603
 604        gsf->gf_fmode = pmc->sfmode;
 605        psl = sock_dereference(pmc->sflist, sk);
 606        count = psl ? psl->sl_count : 0;
 607
 608        copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 609        gsf->gf_numsrc = count;
 610
 611        for (i = 0; i < copycount; i++, p++) {
 612                struct sockaddr_in6 *psin6;
 613                struct sockaddr_storage ss;
 614
 615                psin6 = (struct sockaddr_in6 *)&ss;
 616                memset(&ss, 0, sizeof(ss));
 617                psin6->sin6_family = AF_INET6;
 618                psin6->sin6_addr = psl->sl_addr[i];
 619                if (copy_to_user(p, &ss, sizeof(ss)))
 620                        return -EFAULT;
 621        }
 622        return 0;
 623}
 624
 625bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 626                    const struct in6_addr *src_addr)
 627{
 628        struct ipv6_pinfo *np = inet6_sk(sk);
 629        struct ipv6_mc_socklist *mc;
 630        struct ip6_sf_socklist *psl;
 631        bool rv = true;
 632
 633        rcu_read_lock();
 634        for_each_pmc_rcu(np, mc) {
 635                if (ipv6_addr_equal(&mc->addr, mc_addr))
 636                        break;
 637        }
 638        if (!mc) {
 639                rcu_read_unlock();
 640                return np->mc_all;
 641        }
 642        psl = rcu_dereference(mc->sflist);
 643        if (!psl) {
 644                rv = mc->sfmode == MCAST_EXCLUDE;
 645        } else {
 646                int i;
 647
 648                for (i = 0; i < psl->sl_count; i++) {
 649                        if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 650                                break;
 651                }
 652                if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 653                        rv = false;
 654                if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 655                        rv = false;
 656        }
 657        rcu_read_unlock();
 658
 659        return rv;
 660}
 661
 662/* called with mc_lock */
 663static void igmp6_group_added(struct ifmcaddr6 *mc)
 664{
 665        struct net_device *dev = mc->idev->dev;
 666        char buf[MAX_ADDR_LEN];
 667
 668        if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 669            IPV6_ADDR_SCOPE_LINKLOCAL)
 670                return;
 671
 672        if (!(mc->mca_flags&MAF_LOADED)) {
 673                mc->mca_flags |= MAF_LOADED;
 674                if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 675                        dev_mc_add(dev, buf);
 676        }
 677
 678        if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 679                return;
 680
 681        if (mld_in_v1_mode(mc->idev)) {
 682                igmp6_join_group(mc);
 683                return;
 684        }
 685        /* else v2 */
 686
 687        /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
 688         * should not send filter-mode change record as the mode
 689         * should be from IN() to IN(A).
 690         */
 691        if (mc->mca_sfmode == MCAST_EXCLUDE)
 692                mc->mca_crcount = mc->idev->mc_qrv;
 693
 694        mld_ifc_event(mc->idev);
 695}
 696
 697/* called with mc_lock */
 698static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 699{
 700        struct net_device *dev = mc->idev->dev;
 701        char buf[MAX_ADDR_LEN];
 702
 703        if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 704            IPV6_ADDR_SCOPE_LINKLOCAL)
 705                return;
 706
 707        if (mc->mca_flags&MAF_LOADED) {
 708                mc->mca_flags &= ~MAF_LOADED;
 709                if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 710                        dev_mc_del(dev, buf);
 711        }
 712
 713        if (mc->mca_flags & MAF_NOREPORT)
 714                return;
 715
 716        if (!mc->idev->dead)
 717                igmp6_leave_group(mc);
 718
 719        if (cancel_delayed_work(&mc->mca_work))
 720                refcount_dec(&mc->mca_refcnt);
 721}
 722
 723/*
 724 * deleted ifmcaddr6 manipulation
 725 * called with mc_lock
 726 */
 727static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 728{
 729        struct ifmcaddr6 *pmc;
 730
 731        /* this is an "ifmcaddr6" for convenience; only the fields below
 732         * are actually used. In particular, the refcnt and users are not
 733         * used for management of the delete list. Using the same structure
 734         * for deleted items allows change reports to use common code with
 735         * non-deleted or query-response MCA's.
 736         */
 737        pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
 738        if (!pmc)
 739                return;
 740
 741        pmc->idev = im->idev;
 742        in6_dev_hold(idev);
 743        pmc->mca_addr = im->mca_addr;
 744        pmc->mca_crcount = idev->mc_qrv;
 745        pmc->mca_sfmode = im->mca_sfmode;
 746        if (pmc->mca_sfmode == MCAST_INCLUDE) {
 747                struct ip6_sf_list *psf;
 748
 749                rcu_assign_pointer(pmc->mca_tomb,
 750                                   mc_dereference(im->mca_tomb, idev));
 751                rcu_assign_pointer(pmc->mca_sources,
 752                                   mc_dereference(im->mca_sources, idev));
 753                RCU_INIT_POINTER(im->mca_tomb, NULL);
 754                RCU_INIT_POINTER(im->mca_sources, NULL);
 755
 756                for_each_psf_mclock(pmc, psf)
 757                        psf->sf_crcount = pmc->mca_crcount;
 758        }
 759
 760        rcu_assign_pointer(pmc->next, idev->mc_tomb);
 761        rcu_assign_pointer(idev->mc_tomb, pmc);
 762}
 763
 764/* called with mc_lock */
 765static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 766{
 767        struct ip6_sf_list *psf, *sources, *tomb;
 768        struct in6_addr *pmca = &im->mca_addr;
 769        struct ifmcaddr6 *pmc, *pmc_prev;
 770
 771        pmc_prev = NULL;
 772        for_each_mc_tomb(idev, pmc) {
 773                if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 774                        break;
 775                pmc_prev = pmc;
 776        }
 777        if (pmc) {
 778                if (pmc_prev)
 779                        rcu_assign_pointer(pmc_prev->next, pmc->next);
 780                else
 781                        rcu_assign_pointer(idev->mc_tomb, pmc->next);
 782        }
 783
 784        if (pmc) {
 785                im->idev = pmc->idev;
 786                if (im->mca_sfmode == MCAST_INCLUDE) {
 787                        tomb = rcu_replace_pointer(im->mca_tomb,
 788                                                   mc_dereference(pmc->mca_tomb, pmc->idev),
 789                                                   lockdep_is_held(&im->idev->mc_lock));
 790                        rcu_assign_pointer(pmc->mca_tomb, tomb);
 791
 792                        sources = rcu_replace_pointer(im->mca_sources,
 793                                                      mc_dereference(pmc->mca_sources, pmc->idev),
 794                                                      lockdep_is_held(&im->idev->mc_lock));
 795                        rcu_assign_pointer(pmc->mca_sources, sources);
 796                        for_each_psf_mclock(im, psf)
 797                                psf->sf_crcount = idev->mc_qrv;
 798                } else {
 799                        im->mca_crcount = idev->mc_qrv;
 800                }
 801                in6_dev_put(pmc->idev);
 802                ip6_mc_clear_src(pmc);
 803                kfree_rcu(pmc, rcu);
 804        }
 805}
 806
 807/* called with mc_lock */
 808static void mld_clear_delrec(struct inet6_dev *idev)
 809{
 810        struct ifmcaddr6 *pmc, *nextpmc;
 811
 812        pmc = mc_dereference(idev->mc_tomb, idev);
 813        RCU_INIT_POINTER(idev->mc_tomb, NULL);
 814
 815        for (; pmc; pmc = nextpmc) {
 816                nextpmc = mc_dereference(pmc->next, idev);
 817                ip6_mc_clear_src(pmc);
 818                in6_dev_put(pmc->idev);
 819                kfree_rcu(pmc, rcu);
 820        }
 821
 822        /* clear dead sources, too */
 823        for_each_mc_mclock(idev, pmc) {
 824                struct ip6_sf_list *psf, *psf_next;
 825
 826                psf = mc_dereference(pmc->mca_tomb, idev);
 827                RCU_INIT_POINTER(pmc->mca_tomb, NULL);
 828                for (; psf; psf = psf_next) {
 829                        psf_next = mc_dereference(psf->sf_next, idev);
 830                        kfree_rcu(psf, rcu);
 831                }
 832        }
 833}
 834
 835static void mld_clear_query(struct inet6_dev *idev)
 836{
 837        struct sk_buff *skb;
 838
 839        spin_lock_bh(&idev->mc_query_lock);
 840        while ((skb = __skb_dequeue(&idev->mc_query_queue)))
 841                kfree_skb(skb);
 842        spin_unlock_bh(&idev->mc_query_lock);
 843}
 844
 845static void mld_clear_report(struct inet6_dev *idev)
 846{
 847        struct sk_buff *skb;
 848
 849        spin_lock_bh(&idev->mc_report_lock);
 850        while ((skb = __skb_dequeue(&idev->mc_report_queue)))
 851                kfree_skb(skb);
 852        spin_unlock_bh(&idev->mc_report_lock);
 853}
 854
 855static void mca_get(struct ifmcaddr6 *mc)
 856{
 857        refcount_inc(&mc->mca_refcnt);
 858}
 859
 860static void ma_put(struct ifmcaddr6 *mc)
 861{
 862        if (refcount_dec_and_test(&mc->mca_refcnt)) {
 863                in6_dev_put(mc->idev);
 864                kfree_rcu(mc, rcu);
 865        }
 866}
 867
 868/* called with mc_lock */
 869static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
 870                                   const struct in6_addr *addr,
 871                                   unsigned int mode)
 872{
 873        struct ifmcaddr6 *mc;
 874
 875        mc = kzalloc(sizeof(*mc), GFP_KERNEL);
 876        if (!mc)
 877                return NULL;
 878
 879        INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work);
 880
 881        mc->mca_addr = *addr;
 882        mc->idev = idev; /* reference taken by caller */
 883        mc->mca_users = 1;
 884        /* mca_stamp should be updated upon changes */
 885        mc->mca_cstamp = mc->mca_tstamp = jiffies;
 886        refcount_set(&mc->mca_refcnt, 1);
 887
 888        mc->mca_sfmode = mode;
 889        mc->mca_sfcount[mode] = 1;
 890
 891        if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 892            IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 893                mc->mca_flags |= MAF_NOREPORT;
 894
 895        return mc;
 896}
 897
 898/*
 899 *      device multicast group inc (add if not found)
 900 */
 901static int __ipv6_dev_mc_inc(struct net_device *dev,
 902                             const struct in6_addr *addr, unsigned int mode)
 903{
 904        struct ifmcaddr6 *mc;
 905        struct inet6_dev *idev;
 906
 907        ASSERT_RTNL();
 908
 909        /* we need to take a reference on idev */
 910        idev = in6_dev_get(dev);
 911
 912        if (!idev)
 913                return -EINVAL;
 914
 915        if (idev->dead) {
 916                in6_dev_put(idev);
 917                return -ENODEV;
 918        }
 919
 920        mutex_lock(&idev->mc_lock);
 921        for_each_mc_mclock(idev, mc) {
 922                if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 923                        mc->mca_users++;
 924                        ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
 925                        mutex_unlock(&idev->mc_lock);
 926                        in6_dev_put(idev);
 927                        return 0;
 928                }
 929        }
 930
 931        mc = mca_alloc(idev, addr, mode);
 932        if (!mc) {
 933                mutex_unlock(&idev->mc_lock);
 934                in6_dev_put(idev);
 935                return -ENOMEM;
 936        }
 937
 938        rcu_assign_pointer(mc->next, idev->mc_list);
 939        rcu_assign_pointer(idev->mc_list, mc);
 940
 941        mca_get(mc);
 942
 943        mld_del_delrec(idev, mc);
 944        igmp6_group_added(mc);
 945        mutex_unlock(&idev->mc_lock);
 946        ma_put(mc);
 947        return 0;
 948}
 949
 950int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 951{
 952        return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
 953}
 954EXPORT_SYMBOL(ipv6_dev_mc_inc);
 955
 956/*
 957 * device multicast group del
 958 */
 959int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 960{
 961        struct ifmcaddr6 *ma, __rcu **map;
 962
 963        ASSERT_RTNL();
 964
 965        mutex_lock(&idev->mc_lock);
 966        for (map = &idev->mc_list;
 967             (ma = mc_dereference(*map, idev));
 968             map = &ma->next) {
 969                if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 970                        if (--ma->mca_users == 0) {
 971                                *map = ma->next;
 972
 973                                igmp6_group_dropped(ma);
 974                                ip6_mc_clear_src(ma);
 975                                mutex_unlock(&idev->mc_lock);
 976
 977                                ma_put(ma);
 978                                return 0;
 979                        }
 980                        mutex_unlock(&idev->mc_lock);
 981                        return 0;
 982                }
 983        }
 984
 985        mutex_unlock(&idev->mc_lock);
 986        return -ENOENT;
 987}
 988
 989int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 990{
 991        struct inet6_dev *idev;
 992        int err;
 993
 994        ASSERT_RTNL();
 995
 996        idev = __in6_dev_get(dev);
 997        if (!idev)
 998                err = -ENODEV;
 999        else
1000                err = __ipv6_dev_mc_dec(idev, addr);
1001
1002        return err;
1003}
1004EXPORT_SYMBOL(ipv6_dev_mc_dec);
1005
1006/*
1007 *      check if the interface/address pair is valid
1008 */
1009bool 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        bool rv = false;
1015
1016        rcu_read_lock();
1017        idev = __in6_dev_get(dev);
1018        if (idev) {
1019                for_each_mc_rcu(idev, mc) {
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                                for_each_psf_rcu(mc, psf) {
1028                                        if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1029                                                break;
1030                                }
1031                                if (psf)
1032                                        rv = psf->sf_count[MCAST_INCLUDE] ||
1033                                                psf->sf_count[MCAST_EXCLUDE] !=
1034                                                mc->mca_sfcount[MCAST_EXCLUDE];
1035                                else
1036                                        rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1037                        } else
1038                                rv = true; /* don't filter unspecified source */
1039                }
1040        }
1041        rcu_read_unlock();
1042        return rv;
1043}
1044
1045/* called with mc_lock */
1046static void mld_gq_start_work(struct inet6_dev *idev)
1047{
1048        unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1049
1050        idev->mc_gq_running = 1;
1051        if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2))
1052                in6_dev_hold(idev);
1053}
1054
1055/* called with mc_lock */
1056static void mld_gq_stop_work(struct inet6_dev *idev)
1057{
1058        idev->mc_gq_running = 0;
1059        if (cancel_delayed_work(&idev->mc_gq_work))
1060                __in6_dev_put(idev);
1061}
1062
1063/* called with mc_lock */
1064static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay)
1065{
1066        unsigned long tv = prandom_u32() % delay;
1067
1068        if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2))
1069                in6_dev_hold(idev);
1070}
1071
1072/* called with mc_lock */
1073static void mld_ifc_stop_work(struct inet6_dev *idev)
1074{
1075        idev->mc_ifc_count = 0;
1076        if (cancel_delayed_work(&idev->mc_ifc_work))
1077                __in6_dev_put(idev);
1078}
1079
1080/* called with mc_lock */
1081static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay)
1082{
1083        unsigned long tv = prandom_u32() % delay;
1084
1085        if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2))
1086                in6_dev_hold(idev);
1087}
1088
1089static void mld_dad_stop_work(struct inet6_dev *idev)
1090{
1091        if (cancel_delayed_work(&idev->mc_dad_work))
1092                __in6_dev_put(idev);
1093}
1094
1095static void mld_query_stop_work(struct inet6_dev *idev)
1096{
1097        spin_lock_bh(&idev->mc_query_lock);
1098        if (cancel_delayed_work(&idev->mc_query_work))
1099                __in6_dev_put(idev);
1100        spin_unlock_bh(&idev->mc_query_lock);
1101}
1102
1103static void mld_report_stop_work(struct inet6_dev *idev)
1104{
1105        if (cancel_delayed_work_sync(&idev->mc_report_work))
1106                __in6_dev_put(idev);
1107}
1108
1109/*
1110 * IGMP handling (alias multicast ICMPv6 messages)
1111 * called with mc_lock
1112 */
1113static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1114{
1115        unsigned long delay = resptime;
1116
1117        /* Do not start work for these addresses */
1118        if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1119            IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1120                return;
1121
1122        if (cancel_delayed_work(&ma->mca_work)) {
1123                refcount_dec(&ma->mca_refcnt);
1124                delay = ma->mca_work.timer.expires - jiffies;
1125        }
1126
1127        if (delay >= resptime)
1128                delay = prandom_u32() % resptime;
1129
1130        if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
1131                refcount_inc(&ma->mca_refcnt);
1132        ma->mca_flags |= MAF_TIMER_RUNNING;
1133}
1134
1135/* mark EXCLUDE-mode sources
1136 * called with mc_lock
1137 */
1138static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1139                             const struct in6_addr *srcs)
1140{
1141        struct ip6_sf_list *psf;
1142        int i, scount;
1143
1144        scount = 0;
1145        for_each_psf_mclock(pmc, psf) {
1146                if (scount == nsrcs)
1147                        break;
1148                for (i = 0; i < nsrcs; i++) {
1149                        /* skip inactive filters */
1150                        if (psf->sf_count[MCAST_INCLUDE] ||
1151                            pmc->mca_sfcount[MCAST_EXCLUDE] !=
1152                            psf->sf_count[MCAST_EXCLUDE])
1153                                break;
1154                        if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1155                                scount++;
1156                                break;
1157                        }
1158                }
1159        }
1160        pmc->mca_flags &= ~MAF_GSQUERY;
1161        if (scount == nsrcs)    /* all sources excluded */
1162                return false;
1163        return true;
1164}
1165
1166/* called with mc_lock */
1167static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1168                            const struct in6_addr *srcs)
1169{
1170        struct ip6_sf_list *psf;
1171        int i, scount;
1172
1173        if (pmc->mca_sfmode == MCAST_EXCLUDE)
1174                return mld_xmarksources(pmc, nsrcs, srcs);
1175
1176        /* mark INCLUDE-mode sources */
1177
1178        scount = 0;
1179        for_each_psf_mclock(pmc, psf) {
1180                if (scount == nsrcs)
1181                        break;
1182                for (i = 0; i < nsrcs; i++) {
1183                        if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1184                                psf->sf_gsresp = 1;
1185                                scount++;
1186                                break;
1187                        }
1188                }
1189        }
1190        if (!scount) {
1191                pmc->mca_flags &= ~MAF_GSQUERY;
1192                return false;
1193        }
1194        pmc->mca_flags |= MAF_GSQUERY;
1195        return true;
1196}
1197
1198static int mld_force_mld_version(const struct inet6_dev *idev)
1199{
1200        /* Normally, both are 0 here. If enforcement to a particular is
1201         * being used, individual device enforcement will have a lower
1202         * precedence over 'all' device (.../conf/all/force_mld_version).
1203         */
1204
1205        if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1206                return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1207        else
1208                return idev->cnf.force_mld_version;
1209}
1210
1211static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1212{
1213        return mld_force_mld_version(idev) == 2;
1214}
1215
1216static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1217{
1218        return mld_force_mld_version(idev) == 1;
1219}
1220
1221static bool mld_in_v1_mode(const struct inet6_dev *idev)
1222{
1223        if (mld_in_v2_mode_only(idev))
1224                return false;
1225        if (mld_in_v1_mode_only(idev))
1226                return true;
1227        if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1228                return true;
1229
1230        return false;
1231}
1232
1233static void mld_set_v1_mode(struct inet6_dev *idev)
1234{
1235        /* RFC3810, relevant sections:
1236         *  - 9.1. Robustness Variable
1237         *  - 9.2. Query Interval
1238         *  - 9.3. Query Response Interval
1239         *  - 9.12. Older Version Querier Present Timeout
1240         */
1241        unsigned long switchback;
1242
1243        switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1244
1245        idev->mc_v1_seen = jiffies + switchback;
1246}
1247
1248static void mld_update_qrv(struct inet6_dev *idev,
1249                           const struct mld2_query *mlh2)
1250{
1251        /* RFC3810, relevant sections:
1252         *  - 5.1.8. QRV (Querier's Robustness Variable)
1253         *  - 9.1. Robustness Variable
1254         */
1255
1256        /* The value of the Robustness Variable MUST NOT be zero,
1257         * and SHOULD NOT be one. Catch this here if we ever run
1258         * into such a case in future.
1259         */
1260        const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1261        WARN_ON(idev->mc_qrv == 0);
1262
1263        if (mlh2->mld2q_qrv > 0)
1264                idev->mc_qrv = mlh2->mld2q_qrv;
1265
1266        if (unlikely(idev->mc_qrv < min_qrv)) {
1267                net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1268                                     idev->mc_qrv, min_qrv);
1269                idev->mc_qrv = min_qrv;
1270        }
1271}
1272
1273static void mld_update_qi(struct inet6_dev *idev,
1274                          const struct mld2_query *mlh2)
1275{
1276        /* RFC3810, relevant sections:
1277         *  - 5.1.9. QQIC (Querier's Query Interval Code)
1278         *  - 9.2. Query Interval
1279         *  - 9.12. Older Version Querier Present Timeout
1280         *    (the [Query Interval] in the last Query received)
1281         */
1282        unsigned long mc_qqi;
1283
1284        if (mlh2->mld2q_qqic < 128) {
1285                mc_qqi = mlh2->mld2q_qqic;
1286        } else {
1287                unsigned long mc_man, mc_exp;
1288
1289                mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1290                mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1291
1292                mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1293        }
1294
1295        idev->mc_qi = mc_qqi * HZ;
1296}
1297
1298static void mld_update_qri(struct inet6_dev *idev,
1299                           const struct mld2_query *mlh2)
1300{
1301        /* RFC3810, relevant sections:
1302         *  - 5.1.3. Maximum Response Code
1303         *  - 9.3. Query Response Interval
1304         */
1305        idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1306}
1307
1308static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1309                          unsigned long *max_delay, bool v1_query)
1310{
1311        unsigned long mldv1_md;
1312
1313        /* Ignore v1 queries */
1314        if (mld_in_v2_mode_only(idev))
1315                return -EINVAL;
1316
1317        mldv1_md = ntohs(mld->mld_maxdelay);
1318
1319        /* When in MLDv1 fallback and a MLDv2 router start-up being
1320         * unaware of current MLDv1 operation, the MRC == MRD mapping
1321         * only works when the exponential algorithm is not being
1322         * used (as MLDv1 is unaware of such things).
1323         *
1324         * According to the RFC author, the MLDv2 implementations
1325         * he's aware of all use a MRC < 32768 on start up queries.
1326         *
1327         * Thus, should we *ever* encounter something else larger
1328         * than that, just assume the maximum possible within our
1329         * reach.
1330         */
1331        if (!v1_query)
1332                mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1333
1334        *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1335
1336        /* MLDv1 router present: we need to go into v1 mode *only*
1337         * when an MLDv1 query is received as per section 9.12. of
1338         * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1339         * queries MUST be of exactly 24 octets.
1340         */
1341        if (v1_query)
1342                mld_set_v1_mode(idev);
1343
1344        /* cancel MLDv2 report work */
1345        mld_gq_stop_work(idev);
1346        /* cancel the interface change work */
1347        mld_ifc_stop_work(idev);
1348        /* clear deleted report items */
1349        mld_clear_delrec(idev);
1350
1351        return 0;
1352}
1353
1354static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1355                          unsigned long *max_delay)
1356{
1357        *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1358
1359        mld_update_qrv(idev, mld);
1360        mld_update_qi(idev, mld);
1361        mld_update_qri(idev, mld);
1362
1363        idev->mc_maxdelay = *max_delay;
1364
1365        return 0;
1366}
1367
1368/* called with rcu_read_lock() */
1369int igmp6_event_query(struct sk_buff *skb)
1370{
1371        struct inet6_dev *idev = __in6_dev_get(skb->dev);
1372
1373        if (!idev)
1374                return -EINVAL;
1375
1376        if (idev->dead) {
1377                kfree_skb(skb);
1378                return -ENODEV;
1379        }
1380
1381        spin_lock_bh(&idev->mc_query_lock);
1382        if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) {
1383                __skb_queue_tail(&idev->mc_query_queue, skb);
1384                if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0))
1385                        in6_dev_hold(idev);
1386        }
1387        spin_unlock_bh(&idev->mc_query_lock);
1388
1389        return 0;
1390}
1391
1392static void __mld_query_work(struct sk_buff *skb)
1393{
1394        struct mld2_query *mlh2 = NULL;
1395        const struct in6_addr *group;
1396        unsigned long max_delay;
1397        struct inet6_dev *idev;
1398        struct ifmcaddr6 *ma;
1399        struct mld_msg *mld;
1400        int group_type;
1401        int mark = 0;
1402        int len, err;
1403
1404        if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1405                goto kfree_skb;
1406
1407        /* compute payload length excluding extension headers */
1408        len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1409        len -= skb_network_header_len(skb);
1410
1411        /* RFC3810 6.2
1412         * Upon reception of an MLD message that contains a Query, the node
1413         * checks if the source address of the message is a valid link-local
1414         * address, if the Hop Limit is set to 1, and if the Router Alert
1415         * option is present in the Hop-By-Hop Options header of the IPv6
1416         * packet.  If any of these checks fails, the packet is dropped.
1417         */
1418        if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1419            ipv6_hdr(skb)->hop_limit != 1 ||
1420            !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1421            IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1422                goto kfree_skb;
1423
1424        idev = in6_dev_get(skb->dev);
1425        if (!idev)
1426                goto kfree_skb;
1427
1428        mld = (struct mld_msg *)icmp6_hdr(skb);
1429        group = &mld->mld_mca;
1430        group_type = ipv6_addr_type(group);
1431
1432        if (group_type != IPV6_ADDR_ANY &&
1433            !(group_type&IPV6_ADDR_MULTICAST))
1434                goto out;
1435
1436        if (len < MLD_V1_QUERY_LEN) {
1437                goto out;
1438        } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1439                err = mld_process_v1(idev, mld, &max_delay,
1440                                     len == MLD_V1_QUERY_LEN);
1441                if (err < 0)
1442                        goto out;
1443        } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1444                int srcs_offset = sizeof(struct mld2_query) -
1445                                  sizeof(struct icmp6hdr);
1446
1447                if (!pskb_may_pull(skb, srcs_offset))
1448                        goto out;
1449
1450                mlh2 = (struct mld2_query *)skb_transport_header(skb);
1451
1452                err = mld_process_v2(idev, mlh2, &max_delay);
1453                if (err < 0)
1454                        goto out;
1455
1456                if (group_type == IPV6_ADDR_ANY) { /* general query */
1457                        if (mlh2->mld2q_nsrcs)
1458                                goto out; /* no sources allowed */
1459
1460                        mld_gq_start_work(idev);
1461                        goto out;
1462                }
1463                /* mark sources to include, if group & source-specific */
1464                if (mlh2->mld2q_nsrcs != 0) {
1465                        if (!pskb_may_pull(skb, srcs_offset +
1466                            ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1467                                goto out;
1468
1469                        mlh2 = (struct mld2_query *)skb_transport_header(skb);
1470                        mark = 1;
1471                }
1472        } else {
1473                goto out;
1474        }
1475
1476        if (group_type == IPV6_ADDR_ANY) {
1477                for_each_mc_mclock(idev, ma) {
1478                        igmp6_group_queried(ma, max_delay);
1479                }
1480        } else {
1481                for_each_mc_mclock(idev, ma) {
1482                        if (!ipv6_addr_equal(group, &ma->mca_addr))
1483                                continue;
1484                        if (ma->mca_flags & MAF_TIMER_RUNNING) {
1485                                /* gsquery <- gsquery && mark */
1486                                if (!mark)
1487                                        ma->mca_flags &= ~MAF_GSQUERY;
1488                        } else {
1489                                /* gsquery <- mark */
1490                                if (mark)
1491                                        ma->mca_flags |= MAF_GSQUERY;
1492                                else
1493                                        ma->mca_flags &= ~MAF_GSQUERY;
1494                        }
1495                        if (!(ma->mca_flags & MAF_GSQUERY) ||
1496                            mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1497                                igmp6_group_queried(ma, max_delay);
1498                        break;
1499                }
1500        }
1501
1502out:
1503        in6_dev_put(idev);
1504kfree_skb:
1505        consume_skb(skb);
1506}
1507
1508static void mld_query_work(struct work_struct *work)
1509{
1510        struct inet6_dev *idev = container_of(to_delayed_work(work),
1511                                              struct inet6_dev,
1512                                              mc_query_work);
1513        struct sk_buff_head q;
1514        struct sk_buff *skb;
1515        bool rework = false;
1516        int cnt = 0;
1517
1518        skb_queue_head_init(&q);
1519
1520        spin_lock_bh(&idev->mc_query_lock);
1521        while ((skb = __skb_dequeue(&idev->mc_query_queue))) {
1522                __skb_queue_tail(&q, skb);
1523
1524                if (++cnt >= MLD_MAX_QUEUE) {
1525                        rework = true;
1526                        schedule_delayed_work(&idev->mc_query_work, 0);
1527                        break;
1528                }
1529        }
1530        spin_unlock_bh(&idev->mc_query_lock);
1531
1532        mutex_lock(&idev->mc_lock);
1533        while ((skb = __skb_dequeue(&q)))
1534                __mld_query_work(skb);
1535        mutex_unlock(&idev->mc_lock);
1536
1537        if (!rework)
1538                in6_dev_put(idev);
1539}
1540
1541/* called with rcu_read_lock() */
1542int igmp6_event_report(struct sk_buff *skb)
1543{
1544        struct inet6_dev *idev = __in6_dev_get(skb->dev);
1545
1546        if (!idev)
1547                return -EINVAL;
1548
1549        if (idev->dead) {
1550                kfree_skb(skb);
1551                return -ENODEV;
1552        }
1553
1554        spin_lock_bh(&idev->mc_report_lock);
1555        if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) {
1556                __skb_queue_tail(&idev->mc_report_queue, skb);
1557                if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0))
1558                        in6_dev_hold(idev);
1559        }
1560        spin_unlock_bh(&idev->mc_report_lock);
1561
1562        return 0;
1563}
1564
1565static void __mld_report_work(struct sk_buff *skb)
1566{
1567        struct inet6_dev *idev;
1568        struct ifmcaddr6 *ma;
1569        struct mld_msg *mld;
1570        int addr_type;
1571
1572        /* Our own report looped back. Ignore it. */
1573        if (skb->pkt_type == PACKET_LOOPBACK)
1574                goto kfree_skb;
1575
1576        /* send our report if the MC router may not have heard this report */
1577        if (skb->pkt_type != PACKET_MULTICAST &&
1578            skb->pkt_type != PACKET_BROADCAST)
1579                goto kfree_skb;
1580
1581        if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1582                goto kfree_skb;
1583
1584        mld = (struct mld_msg *)icmp6_hdr(skb);
1585
1586        /* Drop reports with not link local source */
1587        addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1588        if (addr_type != IPV6_ADDR_ANY &&
1589            !(addr_type&IPV6_ADDR_LINKLOCAL))
1590                goto kfree_skb;
1591
1592        idev = in6_dev_get(skb->dev);
1593        if (!idev)
1594                goto kfree_skb;
1595
1596        /*
1597         *      Cancel the work for this group
1598         */
1599
1600        for_each_mc_mclock(idev, ma) {
1601                if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1602                        if (cancel_delayed_work(&ma->mca_work))
1603                                refcount_dec(&ma->mca_refcnt);
1604                        ma->mca_flags &= ~(MAF_LAST_REPORTER |
1605                                           MAF_TIMER_RUNNING);
1606                        break;
1607                }
1608        }
1609
1610        in6_dev_put(idev);
1611kfree_skb:
1612        consume_skb(skb);
1613}
1614
1615static void mld_report_work(struct work_struct *work)
1616{
1617        struct inet6_dev *idev = container_of(to_delayed_work(work),
1618                                              struct inet6_dev,
1619                                              mc_report_work);
1620        struct sk_buff_head q;
1621        struct sk_buff *skb;
1622        bool rework = false;
1623        int cnt = 0;
1624
1625        skb_queue_head_init(&q);
1626        spin_lock_bh(&idev->mc_report_lock);
1627        while ((skb = __skb_dequeue(&idev->mc_report_queue))) {
1628                __skb_queue_tail(&q, skb);
1629
1630                if (++cnt >= MLD_MAX_QUEUE) {
1631                        rework = true;
1632                        schedule_delayed_work(&idev->mc_report_work, 0);
1633                        break;
1634                }
1635        }
1636        spin_unlock_bh(&idev->mc_report_lock);
1637
1638        mutex_lock(&idev->mc_lock);
1639        while ((skb = __skb_dequeue(&q)))
1640                __mld_report_work(skb);
1641        mutex_unlock(&idev->mc_lock);
1642
1643        if (!rework)
1644                in6_dev_put(idev);
1645}
1646
1647static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1648                  int gdeleted, int sdeleted)
1649{
1650        switch (type) {
1651        case MLD2_MODE_IS_INCLUDE:
1652        case MLD2_MODE_IS_EXCLUDE:
1653                if (gdeleted || sdeleted)
1654                        return false;
1655                if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1656                        if (pmc->mca_sfmode == MCAST_INCLUDE)
1657                                return true;
1658                        /* don't include if this source is excluded
1659                         * in all filters
1660                         */
1661                        if (psf->sf_count[MCAST_INCLUDE])
1662                                return type == MLD2_MODE_IS_INCLUDE;
1663                        return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1664                                psf->sf_count[MCAST_EXCLUDE];
1665                }
1666                return false;
1667        case MLD2_CHANGE_TO_INCLUDE:
1668                if (gdeleted || sdeleted)
1669                        return false;
1670                return psf->sf_count[MCAST_INCLUDE] != 0;
1671        case MLD2_CHANGE_TO_EXCLUDE:
1672                if (gdeleted || sdeleted)
1673                        return false;
1674                if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1675                    psf->sf_count[MCAST_INCLUDE])
1676                        return false;
1677                return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1678                        psf->sf_count[MCAST_EXCLUDE];
1679        case MLD2_ALLOW_NEW_SOURCES:
1680                if (gdeleted || !psf->sf_crcount)
1681                        return false;
1682                return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1683        case MLD2_BLOCK_OLD_SOURCES:
1684                if (pmc->mca_sfmode == MCAST_INCLUDE)
1685                        return gdeleted || (psf->sf_crcount && sdeleted);
1686                return psf->sf_crcount && !gdeleted && !sdeleted;
1687        }
1688        return false;
1689}
1690
1691static int
1692mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1693{
1694        struct ip6_sf_list *psf;
1695        int scount = 0;
1696
1697        for_each_psf_mclock(pmc, psf) {
1698                if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1699                        continue;
1700                scount++;
1701        }
1702        return scount;
1703}
1704
1705static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1706                       struct net_device *dev,
1707                       const struct in6_addr *saddr,
1708                       const struct in6_addr *daddr,
1709                       int proto, int len)
1710{
1711        struct ipv6hdr *hdr;
1712
1713        skb->protocol = htons(ETH_P_IPV6);
1714        skb->dev = dev;
1715
1716        skb_reset_network_header(skb);
1717        skb_put(skb, sizeof(struct ipv6hdr));
1718        hdr = ipv6_hdr(skb);
1719
1720        ip6_flow_hdr(hdr, 0, 0);
1721
1722        hdr->payload_len = htons(len);
1723        hdr->nexthdr = proto;
1724        hdr->hop_limit = inet6_sk(sk)->hop_limit;
1725
1726        hdr->saddr = *saddr;
1727        hdr->daddr = *daddr;
1728}
1729
1730static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1731{
1732        u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT,
1733                     2, 0, 0, IPV6_TLV_PADN, 0 };
1734        struct net_device *dev = idev->dev;
1735        int hlen = LL_RESERVED_SPACE(dev);
1736        int tlen = dev->needed_tailroom;
1737        struct net *net = dev_net(dev);
1738        const struct in6_addr *saddr;
1739        struct in6_addr addr_buf;
1740        struct mld2_report *pmr;
1741        struct sk_buff *skb;
1742        unsigned int size;
1743        struct sock *sk;
1744        int err;
1745
1746        sk = net->ipv6.igmp_sk;
1747        /* we assume size > sizeof(ra) here
1748         * Also try to not allocate high-order pages for big MTU
1749         */
1750        size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen;
1751        skb = sock_alloc_send_skb(sk, size, 1, &err);
1752        if (!skb)
1753                return NULL;
1754
1755        skb->priority = TC_PRIO_CONTROL;
1756        skb_reserve(skb, hlen);
1757        skb_tailroom_reserve(skb, mtu, tlen);
1758
1759        if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1760                /* <draft-ietf-magma-mld-source-05.txt>:
1761                 * use unspecified address as the source address
1762                 * when a valid link-local address is not available.
1763                 */
1764                saddr = &in6addr_any;
1765        } else
1766                saddr = &addr_buf;
1767
1768        ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1769
1770        skb_put_data(skb, ra, sizeof(ra));
1771
1772        skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1773        skb_put(skb, sizeof(*pmr));
1774        pmr = (struct mld2_report *)skb_transport_header(skb);
1775        pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1776        pmr->mld2r_resv1 = 0;
1777        pmr->mld2r_cksum = 0;
1778        pmr->mld2r_resv2 = 0;
1779        pmr->mld2r_ngrec = 0;
1780        return skb;
1781}
1782
1783static void mld_sendpack(struct sk_buff *skb)
1784{
1785        struct ipv6hdr *pip6 = ipv6_hdr(skb);
1786        struct mld2_report *pmr =
1787                              (struct mld2_report *)skb_transport_header(skb);
1788        int payload_len, mldlen;
1789        struct inet6_dev *idev;
1790        struct net *net = dev_net(skb->dev);
1791        int err;
1792        struct flowi6 fl6;
1793        struct dst_entry *dst;
1794
1795        rcu_read_lock();
1796        idev = __in6_dev_get(skb->dev);
1797        IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1798
1799        payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1800                sizeof(*pip6);
1801        mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1802        pip6->payload_len = htons(payload_len);
1803
1804        pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1805                                           IPPROTO_ICMPV6,
1806                                           csum_partial(skb_transport_header(skb),
1807                                                        mldlen, 0));
1808
1809        icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1810                         &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1811                         skb->dev->ifindex);
1812        dst = icmp6_dst_alloc(skb->dev, &fl6);
1813
1814        err = 0;
1815        if (IS_ERR(dst)) {
1816                err = PTR_ERR(dst);
1817                dst = NULL;
1818        }
1819        skb_dst_set(skb, dst);
1820        if (err)
1821                goto err_out;
1822
1823        err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1824                      net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1825                      dst_output);
1826out:
1827        if (!err) {
1828                ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1829                ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1830        } else {
1831                IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1832        }
1833
1834        rcu_read_unlock();
1835        return;
1836
1837err_out:
1838        kfree_skb(skb);
1839        goto out;
1840}
1841
1842static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1843{
1844        return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1845}
1846
1847static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1848        int type, struct mld2_grec **ppgr, unsigned int mtu)
1849{
1850        struct mld2_report *pmr;
1851        struct mld2_grec *pgr;
1852
1853        if (!skb) {
1854                skb = mld_newpack(pmc->idev, mtu);
1855                if (!skb)
1856                        return NULL;
1857        }
1858        pgr = skb_put(skb, sizeof(struct mld2_grec));
1859        pgr->grec_type = type;
1860        pgr->grec_auxwords = 0;
1861        pgr->grec_nsrcs = 0;
1862        pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1863        pmr = (struct mld2_report *)skb_transport_header(skb);
1864        pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1865        *ppgr = pgr;
1866        return skb;
1867}
1868
1869#define AVAILABLE(skb)  ((skb) ? skb_availroom(skb) : 0)
1870
1871/* called with mc_lock */
1872static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1873                                int type, int gdeleted, int sdeleted,
1874                                int crsend)
1875{
1876        struct ip6_sf_list *psf, *psf_prev, *psf_next;
1877        int scount, stotal, first, isquery, truncate;
1878        struct ip6_sf_list __rcu **psf_list;
1879        struct inet6_dev *idev = pmc->idev;
1880        struct net_device *dev = idev->dev;
1881        struct mld2_grec *pgr = NULL;
1882        struct mld2_report *pmr;
1883        unsigned int mtu;
1884
1885        if (pmc->mca_flags & MAF_NOREPORT)
1886                return skb;
1887
1888        mtu = READ_ONCE(dev->mtu);
1889        if (mtu < IPV6_MIN_MTU)
1890                return skb;
1891
1892        isquery = type == MLD2_MODE_IS_INCLUDE ||
1893                  type == MLD2_MODE_IS_EXCLUDE;
1894        truncate = type == MLD2_MODE_IS_EXCLUDE ||
1895                    type == MLD2_CHANGE_TO_EXCLUDE;
1896
1897        stotal = scount = 0;
1898
1899        psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1900
1901        if (!rcu_access_pointer(*psf_list))
1902                goto empty_source;
1903
1904        pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1905
1906        /* EX and TO_EX get a fresh packet, if needed */
1907        if (truncate) {
1908                if (pmr && pmr->mld2r_ngrec &&
1909                    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1910                        if (skb)
1911                                mld_sendpack(skb);
1912                        skb = mld_newpack(idev, mtu);
1913                }
1914        }
1915        first = 1;
1916        psf_prev = NULL;
1917        for (psf = mc_dereference(*psf_list, idev);
1918             psf;
1919             psf = psf_next) {
1920                struct in6_addr *psrc;
1921
1922                psf_next = mc_dereference(psf->sf_next, idev);
1923
1924                if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1925                        psf_prev = psf;
1926                        continue;
1927                }
1928
1929                /* Based on RFC3810 6.1. Should not send source-list change
1930                 * records when there is a filter mode change.
1931                 */
1932                if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1933                     (!gdeleted && pmc->mca_crcount)) &&
1934                    (type == MLD2_ALLOW_NEW_SOURCES ||
1935                     type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1936                        goto decrease_sf_crcount;
1937
1938                /* clear marks on query responses */
1939                if (isquery)
1940                        psf->sf_gsresp = 0;
1941
1942                if (AVAILABLE(skb) < sizeof(*psrc) +
1943                    first*sizeof(struct mld2_grec)) {
1944                        if (truncate && !first)
1945                                break;   /* truncate these */
1946                        if (pgr)
1947                                pgr->grec_nsrcs = htons(scount);
1948                        if (skb)
1949                                mld_sendpack(skb);
1950                        skb = mld_newpack(idev, mtu);
1951                        first = 1;
1952                        scount = 0;
1953                }
1954                if (first) {
1955                        skb = add_grhead(skb, pmc, type, &pgr, mtu);
1956                        first = 0;
1957                }
1958                if (!skb)
1959                        return NULL;
1960                psrc = skb_put(skb, sizeof(*psrc));
1961                *psrc = psf->sf_addr;
1962                scount++; stotal++;
1963                if ((type == MLD2_ALLOW_NEW_SOURCES ||
1964                     type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1965decrease_sf_crcount:
1966                        psf->sf_crcount--;
1967                        if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1968                                if (psf_prev)
1969                                        rcu_assign_pointer(psf_prev->sf_next,
1970                                                           mc_dereference(psf->sf_next, idev));
1971                                else
1972                                        rcu_assign_pointer(*psf_list,
1973                                                           mc_dereference(psf->sf_next, idev));
1974                                kfree_rcu(psf, rcu);
1975                                continue;
1976                        }
1977                }
1978                psf_prev = psf;
1979        }
1980
1981empty_source:
1982        if (!stotal) {
1983                if (type == MLD2_ALLOW_NEW_SOURCES ||
1984                    type == MLD2_BLOCK_OLD_SOURCES)
1985                        return skb;
1986                if (pmc->mca_crcount || isquery || crsend) {
1987                        /* make sure we have room for group header */
1988                        if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1989                                mld_sendpack(skb);
1990                                skb = NULL; /* add_grhead will get a new one */
1991                        }
1992                        skb = add_grhead(skb, pmc, type, &pgr, mtu);
1993                }
1994        }
1995        if (pgr)
1996                pgr->grec_nsrcs = htons(scount);
1997
1998        if (isquery)
1999                pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
2000        return skb;
2001}
2002
2003/* called with mc_lock */
2004static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
2005{
2006        struct sk_buff *skb = NULL;
2007        int type;
2008
2009        if (!pmc) {
2010                for_each_mc_mclock(idev, pmc) {
2011                        if (pmc->mca_flags & MAF_NOREPORT)
2012                                continue;
2013                        if (pmc->mca_sfcount[MCAST_EXCLUDE])
2014                                type = MLD2_MODE_IS_EXCLUDE;
2015                        else
2016                                type = MLD2_MODE_IS_INCLUDE;
2017                        skb = add_grec(skb, pmc, type, 0, 0, 0);
2018                }
2019        } else {
2020                if (pmc->mca_sfcount[MCAST_EXCLUDE])
2021                        type = MLD2_MODE_IS_EXCLUDE;
2022                else
2023                        type = MLD2_MODE_IS_INCLUDE;
2024                skb = add_grec(skb, pmc, type, 0, 0, 0);
2025        }
2026        if (skb)
2027                mld_sendpack(skb);
2028}
2029
2030/*
2031 * remove zero-count source records from a source filter list
2032 * called with mc_lock
2033 */
2034static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev)
2035{
2036        struct ip6_sf_list *psf_prev, *psf_next, *psf;
2037
2038        psf_prev = NULL;
2039        for (psf = mc_dereference(*ppsf, idev);
2040             psf;
2041             psf = psf_next) {
2042                psf_next = mc_dereference(psf->sf_next, idev);
2043                if (psf->sf_crcount == 0) {
2044                        if (psf_prev)
2045                                rcu_assign_pointer(psf_prev->sf_next,
2046                                                   mc_dereference(psf->sf_next, idev));
2047                        else
2048                                rcu_assign_pointer(*ppsf,
2049                                                   mc_dereference(psf->sf_next, idev));
2050                        kfree_rcu(psf, rcu);
2051                } else {
2052                        psf_prev = psf;
2053                }
2054        }
2055}
2056
2057/* called with mc_lock */
2058static void mld_send_cr(struct inet6_dev *idev)
2059{
2060        struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
2061        struct sk_buff *skb = NULL;
2062        int type, dtype;
2063
2064        /* deleted MCA's */
2065        pmc_prev = NULL;
2066        for (pmc = mc_dereference(idev->mc_tomb, idev);
2067             pmc;
2068             pmc = pmc_next) {
2069                pmc_next = mc_dereference(pmc->next, idev);
2070                if (pmc->mca_sfmode == MCAST_INCLUDE) {
2071                        type = MLD2_BLOCK_OLD_SOURCES;
2072                        dtype = MLD2_BLOCK_OLD_SOURCES;
2073                        skb = add_grec(skb, pmc, type, 1, 0, 0);
2074                        skb = add_grec(skb, pmc, dtype, 1, 1, 0);
2075                }
2076                if (pmc->mca_crcount) {
2077                        if (pmc->mca_sfmode == MCAST_EXCLUDE) {
2078                                type = MLD2_CHANGE_TO_INCLUDE;
2079                                skb = add_grec(skb, pmc, type, 1, 0, 0);
2080                        }
2081                        pmc->mca_crcount--;
2082                        if (pmc->mca_crcount == 0) {
2083                                mld_clear_zeros(&pmc->mca_tomb, idev);
2084                                mld_clear_zeros(&pmc->mca_sources, idev);
2085                        }
2086                }
2087                if (pmc->mca_crcount == 0 &&
2088                    !rcu_access_pointer(pmc->mca_tomb) &&
2089                    !rcu_access_pointer(pmc->mca_sources)) {
2090                        if (pmc_prev)
2091                                rcu_assign_pointer(pmc_prev->next, pmc_next);
2092                        else
2093                                rcu_assign_pointer(idev->mc_tomb, pmc_next);
2094                        in6_dev_put(pmc->idev);
2095                        kfree_rcu(pmc, rcu);
2096                } else
2097                        pmc_prev = pmc;
2098        }
2099
2100        /* change recs */
2101        for_each_mc_mclock(idev, pmc) {
2102                if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2103                        type = MLD2_BLOCK_OLD_SOURCES;
2104                        dtype = MLD2_ALLOW_NEW_SOURCES;
2105                } else {
2106                        type = MLD2_ALLOW_NEW_SOURCES;
2107                        dtype = MLD2_BLOCK_OLD_SOURCES;
2108                }
2109                skb = add_grec(skb, pmc, type, 0, 0, 0);
2110                skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
2111
2112                /* filter mode changes */
2113                if (pmc->mca_crcount) {
2114                        if (pmc->mca_sfmode == MCAST_EXCLUDE)
2115                                type = MLD2_CHANGE_TO_EXCLUDE;
2116                        else
2117                                type = MLD2_CHANGE_TO_INCLUDE;
2118                        skb = add_grec(skb, pmc, type, 0, 0, 0);
2119                        pmc->mca_crcount--;
2120                }
2121        }
2122        if (!skb)
2123                return;
2124        (void) mld_sendpack(skb);
2125}
2126
2127static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
2128{
2129        struct net *net = dev_net(dev);
2130        struct sock *sk = net->ipv6.igmp_sk;
2131        struct inet6_dev *idev;
2132        struct sk_buff *skb;
2133        struct mld_msg *hdr;
2134        const struct in6_addr *snd_addr, *saddr;
2135        struct in6_addr addr_buf;
2136        int hlen = LL_RESERVED_SPACE(dev);
2137        int tlen = dev->needed_tailroom;
2138        int err, len, payload_len, full_len;
2139        u8 ra[8] = { IPPROTO_ICMPV6, 0,
2140                     IPV6_TLV_ROUTERALERT, 2, 0, 0,
2141                     IPV6_TLV_PADN, 0 };
2142        struct flowi6 fl6;
2143        struct dst_entry *dst;
2144
2145        if (type == ICMPV6_MGM_REDUCTION)
2146                snd_addr = &in6addr_linklocal_allrouters;
2147        else
2148                snd_addr = addr;
2149
2150        len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2151        payload_len = len + sizeof(ra);
2152        full_len = sizeof(struct ipv6hdr) + payload_len;
2153
2154        rcu_read_lock();
2155        IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2156                      IPSTATS_MIB_OUT, full_len);
2157        rcu_read_unlock();
2158
2159        skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2160
2161        if (!skb) {
2162                rcu_read_lock();
2163                IP6_INC_STATS(net, __in6_dev_get(dev),
2164                              IPSTATS_MIB_OUTDISCARDS);
2165                rcu_read_unlock();
2166                return;
2167        }
2168        skb->priority = TC_PRIO_CONTROL;
2169        skb_reserve(skb, hlen);
2170
2171        if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2172                /* <draft-ietf-magma-mld-source-05.txt>:
2173                 * use unspecified address as the source address
2174                 * when a valid link-local address is not available.
2175                 */
2176                saddr = &in6addr_any;
2177        } else
2178                saddr = &addr_buf;
2179
2180        ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2181
2182        skb_put_data(skb, ra, sizeof(ra));
2183
2184        hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2185        hdr->mld_type = type;
2186        hdr->mld_mca = *addr;
2187
2188        hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2189                                         IPPROTO_ICMPV6,
2190                                         csum_partial(hdr, len, 0));
2191
2192        rcu_read_lock();
2193        idev = __in6_dev_get(skb->dev);
2194
2195        icmpv6_flow_init(sk, &fl6, type,
2196                         &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2197                         skb->dev->ifindex);
2198        dst = icmp6_dst_alloc(skb->dev, &fl6);
2199        if (IS_ERR(dst)) {
2200                err = PTR_ERR(dst);
2201                goto err_out;
2202        }
2203
2204        skb_dst_set(skb, dst);
2205        err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2206                      net, sk, skb, NULL, skb->dev,
2207                      dst_output);
2208out:
2209        if (!err) {
2210                ICMP6MSGOUT_INC_STATS(net, idev, type);
2211                ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2212        } else
2213                IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2214
2215        rcu_read_unlock();
2216        return;
2217
2218err_out:
2219        kfree_skb(skb);
2220        goto out;
2221}
2222
2223/* called with mc_lock */
2224static void mld_send_initial_cr(struct inet6_dev *idev)
2225{
2226        struct sk_buff *skb;
2227        struct ifmcaddr6 *pmc;
2228        int type;
2229
2230        if (mld_in_v1_mode(idev))
2231                return;
2232
2233        skb = NULL;
2234        for_each_mc_mclock(idev, pmc) {
2235                if (pmc->mca_sfcount[MCAST_EXCLUDE])
2236                        type = MLD2_CHANGE_TO_EXCLUDE;
2237                else
2238                        type = MLD2_ALLOW_NEW_SOURCES;
2239                skb = add_grec(skb, pmc, type, 0, 0, 1);
2240        }
2241        if (skb)
2242                mld_sendpack(skb);
2243}
2244
2245void ipv6_mc_dad_complete(struct inet6_dev *idev)
2246{
2247        mutex_lock(&idev->mc_lock);
2248        idev->mc_dad_count = idev->mc_qrv;
2249        if (idev->mc_dad_count) {
2250                mld_send_initial_cr(idev);
2251                idev->mc_dad_count--;
2252                if (idev->mc_dad_count)
2253                        mld_dad_start_work(idev,
2254                                           unsolicited_report_interval(idev));
2255        }
2256        mutex_unlock(&idev->mc_lock);
2257}
2258
2259static void mld_dad_work(struct work_struct *work)
2260{
2261        struct inet6_dev *idev = container_of(to_delayed_work(work),
2262                                              struct inet6_dev,
2263                                              mc_dad_work);
2264        mutex_lock(&idev->mc_lock);
2265        mld_send_initial_cr(idev);
2266        if (idev->mc_dad_count) {
2267                idev->mc_dad_count--;
2268                if (idev->mc_dad_count)
2269                        mld_dad_start_work(idev,
2270                                           unsolicited_report_interval(idev));
2271        }
2272        mutex_unlock(&idev->mc_lock);
2273        in6_dev_put(idev);
2274}
2275
2276/* called with mc_lock */
2277static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2278        const struct in6_addr *psfsrc)
2279{
2280        struct ip6_sf_list *psf, *psf_prev;
2281        int rv = 0;
2282
2283        psf_prev = NULL;
2284        for_each_psf_mclock(pmc, psf) {
2285                if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2286                        break;
2287                psf_prev = psf;
2288        }
2289        if (!psf || psf->sf_count[sfmode] == 0) {
2290                /* source filter not found, or count wrong =>  bug */
2291                return -ESRCH;
2292        }
2293        psf->sf_count[sfmode]--;
2294        if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2295                struct inet6_dev *idev = pmc->idev;
2296
2297                /* no more filters for this source */
2298                if (psf_prev)
2299                        rcu_assign_pointer(psf_prev->sf_next,
2300                                           mc_dereference(psf->sf_next, idev));
2301                else
2302                        rcu_assign_pointer(pmc->mca_sources,
2303                                           mc_dereference(psf->sf_next, idev));
2304
2305                if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2306                    !mld_in_v1_mode(idev)) {
2307                        psf->sf_crcount = idev->mc_qrv;
2308                        rcu_assign_pointer(psf->sf_next,
2309                                           mc_dereference(pmc->mca_tomb, idev));
2310                        rcu_assign_pointer(pmc->mca_tomb, psf);
2311                        rv = 1;
2312                } else {
2313                        kfree_rcu(psf, rcu);
2314                }
2315        }
2316        return rv;
2317}
2318
2319/* called with mc_lock */
2320static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2321                          int sfmode, int sfcount, const struct in6_addr *psfsrc,
2322                          int delta)
2323{
2324        struct ifmcaddr6 *pmc;
2325        int     changerec = 0;
2326        int     i, err;
2327
2328        if (!idev)
2329                return -ENODEV;
2330
2331        for_each_mc_mclock(idev, pmc) {
2332                if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2333                        break;
2334        }
2335        if (!pmc)
2336                return -ESRCH;
2337
2338        sf_markstate(pmc);
2339        if (!delta) {
2340                if (!pmc->mca_sfcount[sfmode])
2341                        return -EINVAL;
2342
2343                pmc->mca_sfcount[sfmode]--;
2344        }
2345        err = 0;
2346        for (i = 0; i < sfcount; i++) {
2347                int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2348
2349                changerec |= rv > 0;
2350                if (!err && rv < 0)
2351                        err = rv;
2352        }
2353        if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2354            pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2355            pmc->mca_sfcount[MCAST_INCLUDE]) {
2356                struct ip6_sf_list *psf;
2357
2358                /* filter mode change */
2359                pmc->mca_sfmode = MCAST_INCLUDE;
2360                pmc->mca_crcount = idev->mc_qrv;
2361                idev->mc_ifc_count = pmc->mca_crcount;
2362                for_each_psf_mclock(pmc, psf)
2363                        psf->sf_crcount = 0;
2364                mld_ifc_event(pmc->idev);
2365        } else if (sf_setstate(pmc) || changerec) {
2366                mld_ifc_event(pmc->idev);
2367        }
2368
2369        return err;
2370}
2371
2372/*
2373 * Add multicast single-source filter to the interface list
2374 * called with mc_lock
2375 */
2376static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2377        const struct in6_addr *psfsrc)
2378{
2379        struct ip6_sf_list *psf, *psf_prev;
2380
2381        psf_prev = NULL;
2382        for_each_psf_mclock(pmc, psf) {
2383                if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2384                        break;
2385                psf_prev = psf;
2386        }
2387        if (!psf) {
2388                psf = kzalloc(sizeof(*psf), GFP_KERNEL);
2389                if (!psf)
2390                        return -ENOBUFS;
2391
2392                psf->sf_addr = *psfsrc;
2393                if (psf_prev) {
2394                        rcu_assign_pointer(psf_prev->sf_next, psf);
2395                } else {
2396                        rcu_assign_pointer(pmc->mca_sources, psf);
2397                }
2398        }
2399        psf->sf_count[sfmode]++;
2400        return 0;
2401}
2402
2403/* called with mc_lock */
2404static void sf_markstate(struct ifmcaddr6 *pmc)
2405{
2406        struct ip6_sf_list *psf;
2407        int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2408
2409        for_each_psf_mclock(pmc, psf) {
2410                if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2411                        psf->sf_oldin = mca_xcount ==
2412                                psf->sf_count[MCAST_EXCLUDE] &&
2413                                !psf->sf_count[MCAST_INCLUDE];
2414                } else {
2415                        psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2416                }
2417        }
2418}
2419
2420/* called with mc_lock */
2421static int sf_setstate(struct ifmcaddr6 *pmc)
2422{
2423        struct ip6_sf_list *psf, *dpsf;
2424        int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2425        int qrv = pmc->idev->mc_qrv;
2426        int new_in, rv;
2427
2428        rv = 0;
2429        for_each_psf_mclock(pmc, psf) {
2430                if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2431                        new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2432                                !psf->sf_count[MCAST_INCLUDE];
2433                } else
2434                        new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2435                if (new_in) {
2436                        if (!psf->sf_oldin) {
2437                                struct ip6_sf_list *prev = NULL;
2438
2439                                for_each_psf_tomb(pmc, dpsf) {
2440                                        if (ipv6_addr_equal(&dpsf->sf_addr,
2441                                            &psf->sf_addr))
2442                                                break;
2443                                        prev = dpsf;
2444                                }
2445                                if (dpsf) {
2446                                        if (prev)
2447                                                rcu_assign_pointer(prev->sf_next,
2448                                                                   mc_dereference(dpsf->sf_next,
2449                                                                                  pmc->idev));
2450                                        else
2451                                                rcu_assign_pointer(pmc->mca_tomb,
2452                                                                   mc_dereference(dpsf->sf_next,
2453                                                                                  pmc->idev));
2454                                        kfree_rcu(dpsf, rcu);
2455                                }
2456                                psf->sf_crcount = qrv;
2457                                rv++;
2458                        }
2459                } else if (psf->sf_oldin) {
2460                        psf->sf_crcount = 0;
2461                        /*
2462                         * add or update "delete" records if an active filter
2463                         * is now inactive
2464                         */
2465
2466                        for_each_psf_tomb(pmc, dpsf)
2467                                if (ipv6_addr_equal(&dpsf->sf_addr,
2468                                    &psf->sf_addr))
2469                                        break;
2470                        if (!dpsf) {
2471                                dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL);
2472                                if (!dpsf)
2473                                        continue;
2474                                *dpsf = *psf;
2475                                rcu_assign_pointer(dpsf->sf_next,
2476                                                   mc_dereference(pmc->mca_tomb, pmc->idev));
2477                                rcu_assign_pointer(pmc->mca_tomb, dpsf);
2478                        }
2479                        dpsf->sf_crcount = qrv;
2480                        rv++;
2481                }
2482        }
2483        return rv;
2484}
2485
2486/*
2487 * Add multicast source filter list to the interface list
2488 * called with mc_lock
2489 */
2490static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2491                          int sfmode, int sfcount, const struct in6_addr *psfsrc,
2492                          int delta)
2493{
2494        struct ifmcaddr6 *pmc;
2495        int     isexclude;
2496        int     i, err;
2497
2498        if (!idev)
2499                return -ENODEV;
2500
2501        for_each_mc_mclock(idev, pmc) {
2502                if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2503                        break;
2504        }
2505        if (!pmc)
2506                return -ESRCH;
2507
2508        sf_markstate(pmc);
2509        isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2510        if (!delta)
2511                pmc->mca_sfcount[sfmode]++;
2512        err = 0;
2513        for (i = 0; i < sfcount; i++) {
2514                err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2515                if (err)
2516                        break;
2517        }
2518        if (err) {
2519                int j;
2520
2521                if (!delta)
2522                        pmc->mca_sfcount[sfmode]--;
2523                for (j = 0; j < i; j++)
2524                        ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2525        } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2526                struct ip6_sf_list *psf;
2527
2528                /* filter mode change */
2529                if (pmc->mca_sfcount[MCAST_EXCLUDE])
2530                        pmc->mca_sfmode = MCAST_EXCLUDE;
2531                else if (pmc->mca_sfcount[MCAST_INCLUDE])
2532                        pmc->mca_sfmode = MCAST_INCLUDE;
2533                /* else no filters; keep old mode for reports */
2534
2535                pmc->mca_crcount = idev->mc_qrv;
2536                idev->mc_ifc_count = pmc->mca_crcount;
2537                for_each_psf_mclock(pmc, psf)
2538                        psf->sf_crcount = 0;
2539                mld_ifc_event(idev);
2540        } else if (sf_setstate(pmc)) {
2541                mld_ifc_event(idev);
2542        }
2543        return err;
2544}
2545
2546/* called with mc_lock */
2547static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2548{
2549        struct ip6_sf_list *psf, *nextpsf;
2550
2551        for (psf = mc_dereference(pmc->mca_tomb, pmc->idev);
2552             psf;
2553             psf = nextpsf) {
2554                nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2555                kfree_rcu(psf, rcu);
2556        }
2557        RCU_INIT_POINTER(pmc->mca_tomb, NULL);
2558        for (psf = mc_dereference(pmc->mca_sources, pmc->idev);
2559             psf;
2560             psf = nextpsf) {
2561                nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2562                kfree_rcu(psf, rcu);
2563        }
2564        RCU_INIT_POINTER(pmc->mca_sources, NULL);
2565        pmc->mca_sfmode = MCAST_EXCLUDE;
2566        pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2567        pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2568}
2569
2570/* called with mc_lock */
2571static void igmp6_join_group(struct ifmcaddr6 *ma)
2572{
2573        unsigned long delay;
2574
2575        if (ma->mca_flags & MAF_NOREPORT)
2576                return;
2577
2578        igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2579
2580        delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2581
2582        if (cancel_delayed_work(&ma->mca_work)) {
2583                refcount_dec(&ma->mca_refcnt);
2584                delay = ma->mca_work.timer.expires - jiffies;
2585        }
2586
2587        if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
2588                refcount_inc(&ma->mca_refcnt);
2589        ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2590}
2591
2592static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2593                            struct inet6_dev *idev)
2594{
2595        struct ip6_sf_socklist *psl;
2596        int err;
2597
2598        psl = sock_dereference(iml->sflist, sk);
2599
2600        if (idev)
2601                mutex_lock(&idev->mc_lock);
2602
2603        if (!psl) {
2604                /* any-source empty exclude case */
2605                err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2606        } else {
2607                err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2608                                     psl->sl_count, psl->sl_addr, 0);
2609                RCU_INIT_POINTER(iml->sflist, NULL);
2610                atomic_sub(IP6_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2611                kfree_rcu(psl, rcu);
2612        }
2613
2614        if (idev)
2615                mutex_unlock(&idev->mc_lock);
2616
2617        return err;
2618}
2619
2620/* called with mc_lock */
2621static void igmp6_leave_group(struct ifmcaddr6 *ma)
2622{
2623        if (mld_in_v1_mode(ma->idev)) {
2624                if (ma->mca_flags & MAF_LAST_REPORTER) {
2625                        igmp6_send(&ma->mca_addr, ma->idev->dev,
2626                                ICMPV6_MGM_REDUCTION);
2627                }
2628        } else {
2629                mld_add_delrec(ma->idev, ma);
2630                mld_ifc_event(ma->idev);
2631        }
2632}
2633
2634static void mld_gq_work(struct work_struct *work)
2635{
2636        struct inet6_dev *idev = container_of(to_delayed_work(work),
2637                                              struct inet6_dev,
2638                                              mc_gq_work);
2639
2640        mutex_lock(&idev->mc_lock);
2641        mld_send_report(idev, NULL);
2642        idev->mc_gq_running = 0;
2643        mutex_unlock(&idev->mc_lock);
2644
2645        in6_dev_put(idev);
2646}
2647
2648static void mld_ifc_work(struct work_struct *work)
2649{
2650        struct inet6_dev *idev = container_of(to_delayed_work(work),
2651                                              struct inet6_dev,
2652                                              mc_ifc_work);
2653
2654        mutex_lock(&idev->mc_lock);
2655        mld_send_cr(idev);
2656
2657        if (idev->mc_ifc_count) {
2658                idev->mc_ifc_count--;
2659                if (idev->mc_ifc_count)
2660                        mld_ifc_start_work(idev,
2661                                           unsolicited_report_interval(idev));
2662        }
2663        mutex_unlock(&idev->mc_lock);
2664        in6_dev_put(idev);
2665}
2666
2667/* called with mc_lock */
2668static void mld_ifc_event(struct inet6_dev *idev)
2669{
2670        if (mld_in_v1_mode(idev))
2671                return;
2672
2673        idev->mc_ifc_count = idev->mc_qrv;
2674        mld_ifc_start_work(idev, 1);
2675}
2676
2677static void mld_mca_work(struct work_struct *work)
2678{
2679        struct ifmcaddr6 *ma = container_of(to_delayed_work(work),
2680                                            struct ifmcaddr6, mca_work);
2681
2682        mutex_lock(&ma->idev->mc_lock);
2683        if (mld_in_v1_mode(ma->idev))
2684                igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2685        else
2686                mld_send_report(ma->idev, ma);
2687        ma->mca_flags |=  MAF_LAST_REPORTER;
2688        ma->mca_flags &= ~MAF_TIMER_RUNNING;
2689        mutex_unlock(&ma->idev->mc_lock);
2690
2691        ma_put(ma);
2692}
2693
2694/* Device changing type */
2695
2696void ipv6_mc_unmap(struct inet6_dev *idev)
2697{
2698        struct ifmcaddr6 *i;
2699
2700        /* Install multicast list, except for all-nodes (already installed) */
2701
2702        mutex_lock(&idev->mc_lock);
2703        for_each_mc_mclock(idev, i)
2704                igmp6_group_dropped(i);
2705        mutex_unlock(&idev->mc_lock);
2706}
2707
2708void ipv6_mc_remap(struct inet6_dev *idev)
2709{
2710        ipv6_mc_up(idev);
2711}
2712
2713/* Device going down */
2714void ipv6_mc_down(struct inet6_dev *idev)
2715{
2716        struct ifmcaddr6 *i;
2717
2718        mutex_lock(&idev->mc_lock);
2719        /* Withdraw multicast list */
2720        for_each_mc_mclock(idev, i)
2721                igmp6_group_dropped(i);
2722        mutex_unlock(&idev->mc_lock);
2723
2724        /* Should stop work after group drop. or we will
2725         * start work again in mld_ifc_event()
2726         */
2727        synchronize_net();
2728        mld_query_stop_work(idev);
2729        mld_report_stop_work(idev);
2730        mld_ifc_stop_work(idev);
2731        mld_gq_stop_work(idev);
2732        mld_dad_stop_work(idev);
2733}
2734
2735static void ipv6_mc_reset(struct inet6_dev *idev)
2736{
2737        idev->mc_qrv = sysctl_mld_qrv;
2738        idev->mc_qi = MLD_QI_DEFAULT;
2739        idev->mc_qri = MLD_QRI_DEFAULT;
2740        idev->mc_v1_seen = 0;
2741        idev->mc_maxdelay = unsolicited_report_interval(idev);
2742}
2743
2744/* Device going up */
2745
2746void ipv6_mc_up(struct inet6_dev *idev)
2747{
2748        struct ifmcaddr6 *i;
2749
2750        /* Install multicast list, except for all-nodes (already installed) */
2751
2752        ipv6_mc_reset(idev);
2753        mutex_lock(&idev->mc_lock);
2754        for_each_mc_mclock(idev, i) {
2755                mld_del_delrec(idev, i);
2756                igmp6_group_added(i);
2757        }
2758        mutex_unlock(&idev->mc_lock);
2759}
2760
2761/* IPv6 device initialization. */
2762
2763void ipv6_mc_init_dev(struct inet6_dev *idev)
2764{
2765        idev->mc_gq_running = 0;
2766        INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work);
2767        RCU_INIT_POINTER(idev->mc_tomb, NULL);
2768        idev->mc_ifc_count = 0;
2769        INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work);
2770        INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work);
2771        INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work);
2772        INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work);
2773        skb_queue_head_init(&idev->mc_query_queue);
2774        skb_queue_head_init(&idev->mc_report_queue);
2775        spin_lock_init(&idev->mc_query_lock);
2776        spin_lock_init(&idev->mc_report_lock);
2777        mutex_init(&idev->mc_lock);
2778        ipv6_mc_reset(idev);
2779}
2780
2781/*
2782 *      Device is about to be destroyed: clean up.
2783 */
2784
2785void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2786{
2787        struct ifmcaddr6 *i;
2788
2789        /* Deactivate works */
2790        ipv6_mc_down(idev);
2791        mutex_lock(&idev->mc_lock);
2792        mld_clear_delrec(idev);
2793        mutex_unlock(&idev->mc_lock);
2794        mld_clear_query(idev);
2795        mld_clear_report(idev);
2796
2797        /* Delete all-nodes address. */
2798        /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2799         * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2800         * fail.
2801         */
2802        __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2803
2804        if (idev->cnf.forwarding)
2805                __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2806
2807        mutex_lock(&idev->mc_lock);
2808        while ((i = mc_dereference(idev->mc_list, idev))) {
2809                rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev));
2810
2811                ip6_mc_clear_src(i);
2812                ma_put(i);
2813        }
2814        mutex_unlock(&idev->mc_lock);
2815}
2816
2817static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2818{
2819        struct ifmcaddr6 *pmc;
2820
2821        ASSERT_RTNL();
2822
2823        mutex_lock(&idev->mc_lock);
2824        if (mld_in_v1_mode(idev)) {
2825                for_each_mc_mclock(idev, pmc)
2826                        igmp6_join_group(pmc);
2827        } else {
2828                mld_send_report(idev, NULL);
2829        }
2830        mutex_unlock(&idev->mc_lock);
2831}
2832
2833static int ipv6_mc_netdev_event(struct notifier_block *this,
2834                                unsigned long event,
2835                                void *ptr)
2836{
2837        struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2838        struct inet6_dev *idev = __in6_dev_get(dev);
2839
2840        switch (event) {
2841        case NETDEV_RESEND_IGMP:
2842                if (idev)
2843                        ipv6_mc_rejoin_groups(idev);
2844                break;
2845        default:
2846                break;
2847        }
2848
2849        return NOTIFY_DONE;
2850}
2851
2852static struct notifier_block igmp6_netdev_notifier = {
2853        .notifier_call = ipv6_mc_netdev_event,
2854};
2855
2856#ifdef CONFIG_PROC_FS
2857struct igmp6_mc_iter_state {
2858        struct seq_net_private p;
2859        struct net_device *dev;
2860        struct inet6_dev *idev;
2861};
2862
2863#define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2864
2865static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2866{
2867        struct ifmcaddr6 *im = NULL;
2868        struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2869        struct net *net = seq_file_net(seq);
2870
2871        state->idev = NULL;
2872        for_each_netdev_rcu(net, state->dev) {
2873                struct inet6_dev *idev;
2874                idev = __in6_dev_get(state->dev);
2875                if (!idev)
2876                        continue;
2877
2878                im = rcu_dereference(idev->mc_list);
2879                if (im) {
2880                        state->idev = idev;
2881                        break;
2882                }
2883        }
2884        return im;
2885}
2886
2887static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2888{
2889        struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2890
2891        im = rcu_dereference(im->next);
2892        while (!im) {
2893                state->dev = next_net_device_rcu(state->dev);
2894                if (!state->dev) {
2895                        state->idev = NULL;
2896                        break;
2897                }
2898                state->idev = __in6_dev_get(state->dev);
2899                if (!state->idev)
2900                        continue;
2901                im = rcu_dereference(state->idev->mc_list);
2902        }
2903        return im;
2904}
2905
2906static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2907{
2908        struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2909        if (im)
2910                while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2911                        --pos;
2912        return pos ? NULL : im;
2913}
2914
2915static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2916        __acquires(RCU)
2917{
2918        rcu_read_lock();
2919        return igmp6_mc_get_idx(seq, *pos);
2920}
2921
2922static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2923{
2924        struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2925
2926        ++*pos;
2927        return im;
2928}
2929
2930static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2931        __releases(RCU)
2932{
2933        struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2934
2935        if (likely(state->idev))
2936                state->idev = NULL;
2937        state->dev = NULL;
2938        rcu_read_unlock();
2939}
2940
2941static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2942{
2943        struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2944        struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2945
2946        seq_printf(seq,
2947                   "%-4d %-15s %pi6 %5d %08X %ld\n",
2948                   state->dev->ifindex, state->dev->name,
2949                   &im->mca_addr,
2950                   im->mca_users, im->mca_flags,
2951                   (im->mca_flags & MAF_TIMER_RUNNING) ?
2952                   jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0);
2953        return 0;
2954}
2955
2956static const struct seq_operations igmp6_mc_seq_ops = {
2957        .start  =       igmp6_mc_seq_start,
2958        .next   =       igmp6_mc_seq_next,
2959        .stop   =       igmp6_mc_seq_stop,
2960        .show   =       igmp6_mc_seq_show,
2961};
2962
2963struct igmp6_mcf_iter_state {
2964        struct seq_net_private p;
2965        struct net_device *dev;
2966        struct inet6_dev *idev;
2967        struct ifmcaddr6 *im;
2968};
2969
2970#define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2971
2972static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2973{
2974        struct ip6_sf_list *psf = NULL;
2975        struct ifmcaddr6 *im = NULL;
2976        struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2977        struct net *net = seq_file_net(seq);
2978
2979        state->idev = NULL;
2980        state->im = NULL;
2981        for_each_netdev_rcu(net, state->dev) {
2982                struct inet6_dev *idev;
2983                idev = __in6_dev_get(state->dev);
2984                if (unlikely(idev == NULL))
2985                        continue;
2986
2987                im = rcu_dereference(idev->mc_list);
2988                if (likely(im)) {
2989                        psf = rcu_dereference(im->mca_sources);
2990                        if (likely(psf)) {
2991                                state->im = im;
2992                                state->idev = idev;
2993                                break;
2994                        }
2995                }
2996        }
2997        return psf;
2998}
2999
3000static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
3001{
3002        struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3003
3004        psf = rcu_dereference(psf->sf_next);
3005        while (!psf) {
3006                state->im = rcu_dereference(state->im->next);
3007                while (!state->im) {
3008                        state->dev = next_net_device_rcu(state->dev);
3009                        if (!state->dev) {
3010                                state->idev = NULL;
3011                                goto out;
3012                        }
3013                        state->idev = __in6_dev_get(state->dev);
3014                        if (!state->idev)
3015                                continue;
3016                        state->im = rcu_dereference(state->idev->mc_list);
3017                }
3018                if (!state->im)
3019                        break;
3020                psf = rcu_dereference(state->im->mca_sources);
3021        }
3022out:
3023        return psf;
3024}
3025
3026static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
3027{
3028        struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
3029        if (psf)
3030                while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
3031                        --pos;
3032        return pos ? NULL : psf;
3033}
3034
3035static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
3036        __acquires(RCU)
3037{
3038        rcu_read_lock();
3039        return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
3040}
3041
3042static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3043{
3044        struct ip6_sf_list *psf;
3045        if (v == SEQ_START_TOKEN)
3046                psf = igmp6_mcf_get_first(seq);
3047        else
3048                psf = igmp6_mcf_get_next(seq, v);
3049        ++*pos;
3050        return psf;
3051}
3052
3053static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
3054        __releases(RCU)
3055{
3056        struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3057
3058        if (likely(state->im))
3059                state->im = NULL;
3060        if (likely(state->idev))
3061                state->idev = NULL;
3062
3063        state->dev = NULL;
3064        rcu_read_unlock();
3065}
3066
3067static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
3068{
3069        struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
3070        struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3071
3072        if (v == SEQ_START_TOKEN) {
3073                seq_puts(seq, "Idx Device                Multicast Address                   Source Address    INC    EXC\n");
3074        } else {
3075                seq_printf(seq,
3076                           "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
3077                           state->dev->ifindex, state->dev->name,
3078                           &state->im->mca_addr,
3079                           &psf->sf_addr,
3080                           psf->sf_count[MCAST_INCLUDE],
3081                           psf->sf_count[MCAST_EXCLUDE]);
3082        }
3083        return 0;
3084}
3085
3086static const struct seq_operations igmp6_mcf_seq_ops = {
3087        .start  =       igmp6_mcf_seq_start,
3088        .next   =       igmp6_mcf_seq_next,
3089        .stop   =       igmp6_mcf_seq_stop,
3090        .show   =       igmp6_mcf_seq_show,
3091};
3092
3093static int __net_init igmp6_proc_init(struct net *net)
3094{
3095        int err;
3096
3097        err = -ENOMEM;
3098        if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
3099                        sizeof(struct igmp6_mc_iter_state)))
3100                goto out;
3101        if (!proc_create_net("mcfilter6", 0444, net->proc_net,
3102                        &igmp6_mcf_seq_ops,
3103                        sizeof(struct igmp6_mcf_iter_state)))
3104                goto out_proc_net_igmp6;
3105
3106        err = 0;
3107out:
3108        return err;
3109
3110out_proc_net_igmp6:
3111        remove_proc_entry("igmp6", net->proc_net);
3112        goto out;
3113}
3114
3115static void __net_exit igmp6_proc_exit(struct net *net)
3116{
3117        remove_proc_entry("mcfilter6", net->proc_net);
3118        remove_proc_entry("igmp6", net->proc_net);
3119}
3120#else
3121static inline int igmp6_proc_init(struct net *net)
3122{
3123        return 0;
3124}
3125static inline void igmp6_proc_exit(struct net *net)
3126{
3127}
3128#endif
3129
3130static int __net_init igmp6_net_init(struct net *net)
3131{
3132        int err;
3133
3134        err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
3135                                   SOCK_RAW, IPPROTO_ICMPV6, net);
3136        if (err < 0) {
3137                pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
3138                       err);
3139                goto out;
3140        }
3141
3142        inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
3143        net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL;
3144
3145        err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
3146                                   SOCK_RAW, IPPROTO_ICMPV6, net);
3147        if (err < 0) {
3148                pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
3149                       err);
3150                goto out_sock_create;
3151        }
3152
3153        err = igmp6_proc_init(net);
3154        if (err)
3155                goto out_sock_create_autojoin;
3156
3157        return 0;
3158
3159out_sock_create_autojoin:
3160        inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3161out_sock_create:
3162        inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3163out:
3164        return err;
3165}
3166
3167static void __net_exit igmp6_net_exit(struct net *net)
3168{
3169        inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3170        inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3171        igmp6_proc_exit(net);
3172}
3173
3174static struct pernet_operations igmp6_net_ops = {
3175        .init = igmp6_net_init,
3176        .exit = igmp6_net_exit,
3177};
3178
3179int __init igmp6_init(void)
3180{
3181        int err;
3182
3183        err = register_pernet_subsys(&igmp6_net_ops);
3184        if (err)
3185                return err;
3186
3187        mld_wq = create_workqueue("mld");
3188        if (!mld_wq) {
3189                unregister_pernet_subsys(&igmp6_net_ops);
3190                return -ENOMEM;
3191        }
3192
3193        return err;
3194}
3195
3196int __init igmp6_late_init(void)
3197{
3198        return register_netdevice_notifier(&igmp6_netdev_notifier);
3199}
3200
3201void igmp6_cleanup(void)
3202{
3203        unregister_pernet_subsys(&igmp6_net_ops);
3204        destroy_workqueue(mld_wq);
3205}
3206
3207void igmp6_late_cleanup(void)
3208{
3209        unregister_netdevice_notifier(&igmp6_netdev_notifier);
3210}
3211