linux/net/ipv6/mcast.c
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   1/*
   2 *      Multicast support for IPv6
   3 *      Linux INET6 implementation
   4 *
   5 *      Authors:
   6 *      Pedro Roque             <roque@di.fc.ul.pt>
   7 *
   8 *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9 *
  10 *      This program is free software; you can redistribute it and/or
  11 *      modify it under the terms of the GNU General Public License
  12 *      as published by the Free Software Foundation; either version
  13 *      2 of the License, or (at your option) any later version.
  14 */
  15
  16/* Changes:
  17 *
  18 *      yoshfuji        : fix format of router-alert option
  19 *      YOSHIFUJI Hideaki @USAGI:
  20 *              Fixed source address for MLD message based on
  21 *              <draft-ietf-magma-mld-source-05.txt>.
  22 *      YOSHIFUJI Hideaki @USAGI:
  23 *              - Ignore Queries for invalid addresses.
  24 *              - MLD for link-local addresses.
  25 *      David L Stevens <dlstevens@us.ibm.com>:
  26 *              - MLDv2 support
  27 */
  28
  29#include <linux/module.h>
  30#include <linux/errno.h>
  31#include <linux/types.h>
  32#include <linux/string.h>
  33#include <linux/socket.h>
  34#include <linux/sockios.h>
  35#include <linux/jiffies.h>
  36#include <linux/times.h>
  37#include <linux/net.h>
  38#include <linux/in.h>
  39#include <linux/in6.h>
  40#include <linux/netdevice.h>
  41#include <linux/if_arp.h>
  42#include <linux/route.h>
  43#include <linux/init.h>
  44#include <linux/proc_fs.h>
  45#include <linux/seq_file.h>
  46#include <linux/slab.h>
  47#include <net/mld.h>
  48
  49#include <linux/netfilter.h>
  50#include <linux/netfilter_ipv6.h>
  51
  52#include <net/net_namespace.h>
  53#include <net/sock.h>
  54#include <net/snmp.h>
  55
  56#include <net/ipv6.h>
  57#include <net/protocol.h>
  58#include <net/if_inet6.h>
  59#include <net/ndisc.h>
  60#include <net/addrconf.h>
  61#include <net/ip6_route.h>
  62#include <net/inet_common.h>
  63
  64#include <net/ip6_checksum.h>
  65
  66/* Set to 3 to get tracing... */
  67#define MCAST_DEBUG 2
  68
  69#if MCAST_DEBUG >= 3
  70#define MDBG(x) printk x
  71#else
  72#define MDBG(x)
  73#endif
  74
  75/* Ensure that we have struct in6_addr aligned on 32bit word. */
  76static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  77        BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  78        BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  79        BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  80};
  81
  82static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  83
  84/* Big mc list lock for all the sockets */
  85static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  86
  87static void igmp6_join_group(struct ifmcaddr6 *ma);
  88static void igmp6_leave_group(struct ifmcaddr6 *ma);
  89static void igmp6_timer_handler(unsigned long data);
  90
  91static void mld_gq_timer_expire(unsigned long data);
  92static void mld_ifc_timer_expire(unsigned long data);
  93static void mld_ifc_event(struct inet6_dev *idev);
  94static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  95static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  96static void mld_clear_delrec(struct inet6_dev *idev);
  97static int sf_setstate(struct ifmcaddr6 *pmc);
  98static void sf_markstate(struct ifmcaddr6 *pmc);
  99static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 100static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 101                          int sfmode, int sfcount, const struct in6_addr *psfsrc,
 102                          int delta);
 103static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 104                          int sfmode, int sfcount, const struct in6_addr *psfsrc,
 105                          int delta);
 106static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 107                            struct inet6_dev *idev);
 108
 109
 110#define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 111#define MLD_QRV_DEFAULT         2
 112
 113#define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 114                (idev)->cnf.force_mld_version == 1 || \
 115                ((idev)->mc_v1_seen && \
 116                time_before(jiffies, (idev)->mc_v1_seen)))
 117
 118#define IPV6_MLD_MAX_MSF        64
 119
 120int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 121
 122/*
 123 *      socket join on multicast group
 124 */
 125
 126#define for_each_pmc_rcu(np, pmc)                               \
 127        for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 128             pmc != NULL;                                       \
 129             pmc = rcu_dereference(pmc->next))
 130
 131int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 132{
 133        struct net_device *dev = NULL;
 134        struct ipv6_mc_socklist *mc_lst;
 135        struct ipv6_pinfo *np = inet6_sk(sk);
 136        struct net *net = sock_net(sk);
 137        int err;
 138
 139        if (!ipv6_addr_is_multicast(addr))
 140                return -EINVAL;
 141
 142        rcu_read_lock();
 143        for_each_pmc_rcu(np, mc_lst) {
 144                if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 145                    ipv6_addr_equal(&mc_lst->addr, addr)) {
 146                        rcu_read_unlock();
 147                        return -EADDRINUSE;
 148                }
 149        }
 150        rcu_read_unlock();
 151
 152        mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 153
 154        if (mc_lst == NULL)
 155                return -ENOMEM;
 156
 157        mc_lst->next = NULL;
 158        mc_lst->addr = *addr;
 159
 160        rcu_read_lock();
 161        if (ifindex == 0) {
 162                struct rt6_info *rt;
 163                rt = rt6_lookup(net, addr, NULL, 0, 0);
 164                if (rt) {
 165                        dev = rt->dst.dev;
 166                        dst_release(&rt->dst);
 167                }
 168        } else
 169                dev = dev_get_by_index_rcu(net, ifindex);
 170
 171        if (dev == NULL) {
 172                rcu_read_unlock();
 173                sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 174                return -ENODEV;
 175        }
 176
 177        mc_lst->ifindex = dev->ifindex;
 178        mc_lst->sfmode = MCAST_EXCLUDE;
 179        rwlock_init(&mc_lst->sflock);
 180        mc_lst->sflist = NULL;
 181
 182        /*
 183         *      now add/increase the group membership on the device
 184         */
 185
 186        err = ipv6_dev_mc_inc(dev, addr);
 187
 188        if (err) {
 189                rcu_read_unlock();
 190                sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 191                return err;
 192        }
 193
 194        spin_lock(&ipv6_sk_mc_lock);
 195        mc_lst->next = np->ipv6_mc_list;
 196        rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 197        spin_unlock(&ipv6_sk_mc_lock);
 198
 199        rcu_read_unlock();
 200
 201        return 0;
 202}
 203
 204/*
 205 *      socket leave on multicast group
 206 */
 207int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 208{
 209        struct ipv6_pinfo *np = inet6_sk(sk);
 210        struct ipv6_mc_socklist *mc_lst;
 211        struct ipv6_mc_socklist __rcu **lnk;
 212        struct net *net = sock_net(sk);
 213
 214        if (!ipv6_addr_is_multicast(addr))
 215                return -EINVAL;
 216
 217        spin_lock(&ipv6_sk_mc_lock);
 218        for (lnk = &np->ipv6_mc_list;
 219             (mc_lst = rcu_dereference_protected(*lnk,
 220                        lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 221              lnk = &mc_lst->next) {
 222                if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 223                    ipv6_addr_equal(&mc_lst->addr, addr)) {
 224                        struct net_device *dev;
 225
 226                        *lnk = mc_lst->next;
 227                        spin_unlock(&ipv6_sk_mc_lock);
 228
 229                        rcu_read_lock();
 230                        dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 231                        if (dev != NULL) {
 232                                struct inet6_dev *idev = __in6_dev_get(dev);
 233
 234                                (void) ip6_mc_leave_src(sk, mc_lst, idev);
 235                                if (idev)
 236                                        __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 237                        } else
 238                                (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 239                        rcu_read_unlock();
 240                        atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 241                        kfree_rcu(mc_lst, rcu);
 242                        return 0;
 243                }
 244        }
 245        spin_unlock(&ipv6_sk_mc_lock);
 246
 247        return -EADDRNOTAVAIL;
 248}
 249
 250/* called with rcu_read_lock() */
 251static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 252                                             const struct in6_addr *group,
 253                                             int ifindex)
 254{
 255        struct net_device *dev = NULL;
 256        struct inet6_dev *idev = NULL;
 257
 258        if (ifindex == 0) {
 259                struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 260
 261                if (rt) {
 262                        dev = rt->dst.dev;
 263                        dst_release(&rt->dst);
 264                }
 265        } else
 266                dev = dev_get_by_index_rcu(net, ifindex);
 267
 268        if (!dev)
 269                return NULL;
 270        idev = __in6_dev_get(dev);
 271        if (!idev)
 272                return NULL;
 273        read_lock_bh(&idev->lock);
 274        if (idev->dead) {
 275                read_unlock_bh(&idev->lock);
 276                return NULL;
 277        }
 278        return idev;
 279}
 280
 281void ipv6_sock_mc_close(struct sock *sk)
 282{
 283        struct ipv6_pinfo *np = inet6_sk(sk);
 284        struct ipv6_mc_socklist *mc_lst;
 285        struct net *net = sock_net(sk);
 286
 287        spin_lock(&ipv6_sk_mc_lock);
 288        while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 289                                lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 290                struct net_device *dev;
 291
 292                np->ipv6_mc_list = mc_lst->next;
 293                spin_unlock(&ipv6_sk_mc_lock);
 294
 295                rcu_read_lock();
 296                dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 297                if (dev) {
 298                        struct inet6_dev *idev = __in6_dev_get(dev);
 299
 300                        (void) ip6_mc_leave_src(sk, mc_lst, idev);
 301                        if (idev)
 302                                __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 303                } else
 304                        (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 305                rcu_read_unlock();
 306
 307                atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 308                kfree_rcu(mc_lst, rcu);
 309
 310                spin_lock(&ipv6_sk_mc_lock);
 311        }
 312        spin_unlock(&ipv6_sk_mc_lock);
 313}
 314
 315int ip6_mc_source(int add, int omode, struct sock *sk,
 316        struct group_source_req *pgsr)
 317{
 318        struct in6_addr *source, *group;
 319        struct ipv6_mc_socklist *pmc;
 320        struct inet6_dev *idev;
 321        struct ipv6_pinfo *inet6 = inet6_sk(sk);
 322        struct ip6_sf_socklist *psl;
 323        struct net *net = sock_net(sk);
 324        int i, j, rv;
 325        int leavegroup = 0;
 326        int pmclocked = 0;
 327        int err;
 328
 329        source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 330        group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 331
 332        if (!ipv6_addr_is_multicast(group))
 333                return -EINVAL;
 334
 335        rcu_read_lock();
 336        idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 337        if (!idev) {
 338                rcu_read_unlock();
 339                return -ENODEV;
 340        }
 341
 342        err = -EADDRNOTAVAIL;
 343
 344        for_each_pmc_rcu(inet6, pmc) {
 345                if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 346                        continue;
 347                if (ipv6_addr_equal(&pmc->addr, group))
 348                        break;
 349        }
 350        if (!pmc) {             /* must have a prior join */
 351                err = -EINVAL;
 352                goto done;
 353        }
 354        /* if a source filter was set, must be the same mode as before */
 355        if (pmc->sflist) {
 356                if (pmc->sfmode != omode) {
 357                        err = -EINVAL;
 358                        goto done;
 359                }
 360        } else if (pmc->sfmode != omode) {
 361                /* allow mode switches for empty-set filters */
 362                ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 363                ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 364                pmc->sfmode = omode;
 365        }
 366
 367        write_lock(&pmc->sflock);
 368        pmclocked = 1;
 369
 370        psl = pmc->sflist;
 371        if (!add) {
 372                if (!psl)
 373                        goto done;      /* err = -EADDRNOTAVAIL */
 374                rv = !0;
 375                for (i=0; i<psl->sl_count; i++) {
 376                        rv = memcmp(&psl->sl_addr[i], source,
 377                                sizeof(struct in6_addr));
 378                        if (rv == 0)
 379                                break;
 380                }
 381                if (rv)         /* source not found */
 382                        goto done;      /* err = -EADDRNOTAVAIL */
 383
 384                /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 385                if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 386                        leavegroup = 1;
 387                        goto done;
 388                }
 389
 390                /* update the interface filter */
 391                ip6_mc_del_src(idev, group, omode, 1, source, 1);
 392
 393                for (j=i+1; j<psl->sl_count; j++)
 394                        psl->sl_addr[j-1] = psl->sl_addr[j];
 395                psl->sl_count--;
 396                err = 0;
 397                goto done;
 398        }
 399        /* else, add a new source to the filter */
 400
 401        if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 402                err = -ENOBUFS;
 403                goto done;
 404        }
 405        if (!psl || psl->sl_count == psl->sl_max) {
 406                struct ip6_sf_socklist *newpsl;
 407                int count = IP6_SFBLOCK;
 408
 409                if (psl)
 410                        count += psl->sl_max;
 411                newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 412                if (!newpsl) {
 413                        err = -ENOBUFS;
 414                        goto done;
 415                }
 416                newpsl->sl_max = count;
 417                newpsl->sl_count = count - IP6_SFBLOCK;
 418                if (psl) {
 419                        for (i=0; i<psl->sl_count; i++)
 420                                newpsl->sl_addr[i] = psl->sl_addr[i];
 421                        sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 422                }
 423                pmc->sflist = psl = newpsl;
 424        }
 425        rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 426        for (i=0; i<psl->sl_count; i++) {
 427                rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 428                if (rv == 0)
 429                        break;
 430        }
 431        if (rv == 0)            /* address already there is an error */
 432                goto done;
 433        for (j=psl->sl_count-1; j>=i; j--)
 434                psl->sl_addr[j+1] = psl->sl_addr[j];
 435        psl->sl_addr[i] = *source;
 436        psl->sl_count++;
 437        err = 0;
 438        /* update the interface list */
 439        ip6_mc_add_src(idev, group, omode, 1, source, 1);
 440done:
 441        if (pmclocked)
 442                write_unlock(&pmc->sflock);
 443        read_unlock_bh(&idev->lock);
 444        rcu_read_unlock();
 445        if (leavegroup)
 446                return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 447        return err;
 448}
 449
 450int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 451{
 452        const struct in6_addr *group;
 453        struct ipv6_mc_socklist *pmc;
 454        struct inet6_dev *idev;
 455        struct ipv6_pinfo *inet6 = inet6_sk(sk);
 456        struct ip6_sf_socklist *newpsl, *psl;
 457        struct net *net = sock_net(sk);
 458        int leavegroup = 0;
 459        int i, err;
 460
 461        group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 462
 463        if (!ipv6_addr_is_multicast(group))
 464                return -EINVAL;
 465        if (gsf->gf_fmode != MCAST_INCLUDE &&
 466            gsf->gf_fmode != MCAST_EXCLUDE)
 467                return -EINVAL;
 468
 469        rcu_read_lock();
 470        idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 471
 472        if (!idev) {
 473                rcu_read_unlock();
 474                return -ENODEV;
 475        }
 476
 477        err = 0;
 478
 479        if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 480                leavegroup = 1;
 481                goto done;
 482        }
 483
 484        for_each_pmc_rcu(inet6, pmc) {
 485                if (pmc->ifindex != gsf->gf_interface)
 486                        continue;
 487                if (ipv6_addr_equal(&pmc->addr, group))
 488                        break;
 489        }
 490        if (!pmc) {             /* must have a prior join */
 491                err = -EINVAL;
 492                goto done;
 493        }
 494        if (gsf->gf_numsrc) {
 495                newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 496                                                          GFP_ATOMIC);
 497                if (!newpsl) {
 498                        err = -ENOBUFS;
 499                        goto done;
 500                }
 501                newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 502                for (i=0; i<newpsl->sl_count; ++i) {
 503                        struct sockaddr_in6 *psin6;
 504
 505                        psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 506                        newpsl->sl_addr[i] = psin6->sin6_addr;
 507                }
 508                err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 509                        newpsl->sl_count, newpsl->sl_addr, 0);
 510                if (err) {
 511                        sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 512                        goto done;
 513                }
 514        } else {
 515                newpsl = NULL;
 516                (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 517        }
 518
 519        write_lock(&pmc->sflock);
 520        psl = pmc->sflist;
 521        if (psl) {
 522                (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 523                        psl->sl_count, psl->sl_addr, 0);
 524                sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 525        } else
 526                (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 527        pmc->sflist = newpsl;
 528        pmc->sfmode = gsf->gf_fmode;
 529        write_unlock(&pmc->sflock);
 530        err = 0;
 531done:
 532        read_unlock_bh(&idev->lock);
 533        rcu_read_unlock();
 534        if (leavegroup)
 535                err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 536        return err;
 537}
 538
 539int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 540        struct group_filter __user *optval, int __user *optlen)
 541{
 542        int err, i, count, copycount;
 543        const struct in6_addr *group;
 544        struct ipv6_mc_socklist *pmc;
 545        struct inet6_dev *idev;
 546        struct ipv6_pinfo *inet6 = inet6_sk(sk);
 547        struct ip6_sf_socklist *psl;
 548        struct net *net = sock_net(sk);
 549
 550        group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 551
 552        if (!ipv6_addr_is_multicast(group))
 553                return -EINVAL;
 554
 555        rcu_read_lock();
 556        idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 557
 558        if (!idev) {
 559                rcu_read_unlock();
 560                return -ENODEV;
 561        }
 562
 563        err = -EADDRNOTAVAIL;
 564        /*
 565         * changes to the ipv6_mc_list require the socket lock and
 566         * a read lock on ip6_sk_mc_lock. We have the socket lock,
 567         * so reading the list is safe.
 568         */
 569
 570        for_each_pmc_rcu(inet6, pmc) {
 571                if (pmc->ifindex != gsf->gf_interface)
 572                        continue;
 573                if (ipv6_addr_equal(group, &pmc->addr))
 574                        break;
 575        }
 576        if (!pmc)               /* must have a prior join */
 577                goto done;
 578        gsf->gf_fmode = pmc->sfmode;
 579        psl = pmc->sflist;
 580        count = psl ? psl->sl_count : 0;
 581        read_unlock_bh(&idev->lock);
 582        rcu_read_unlock();
 583
 584        copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 585        gsf->gf_numsrc = count;
 586        if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 587            copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 588                return -EFAULT;
 589        }
 590        /* changes to psl require the socket lock, a read lock on
 591         * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 592         * have the socket lock, so reading here is safe.
 593         */
 594        for (i=0; i<copycount; i++) {
 595                struct sockaddr_in6 *psin6;
 596                struct sockaddr_storage ss;
 597
 598                psin6 = (struct sockaddr_in6 *)&ss;
 599                memset(&ss, 0, sizeof(ss));
 600                psin6->sin6_family = AF_INET6;
 601                psin6->sin6_addr = psl->sl_addr[i];
 602                if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 603                        return -EFAULT;
 604        }
 605        return 0;
 606done:
 607        read_unlock_bh(&idev->lock);
 608        rcu_read_unlock();
 609        return err;
 610}
 611
 612bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 613                    const struct in6_addr *src_addr)
 614{
 615        struct ipv6_pinfo *np = inet6_sk(sk);
 616        struct ipv6_mc_socklist *mc;
 617        struct ip6_sf_socklist *psl;
 618        bool rv = true;
 619
 620        rcu_read_lock();
 621        for_each_pmc_rcu(np, mc) {
 622                if (ipv6_addr_equal(&mc->addr, mc_addr))
 623                        break;
 624        }
 625        if (!mc) {
 626                rcu_read_unlock();
 627                return true;
 628        }
 629        read_lock(&mc->sflock);
 630        psl = mc->sflist;
 631        if (!psl) {
 632                rv = mc->sfmode == MCAST_EXCLUDE;
 633        } else {
 634                int i;
 635
 636                for (i=0; i<psl->sl_count; i++) {
 637                        if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 638                                break;
 639                }
 640                if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 641                        rv = false;
 642                if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 643                        rv = false;
 644        }
 645        read_unlock(&mc->sflock);
 646        rcu_read_unlock();
 647
 648        return rv;
 649}
 650
 651static void ma_put(struct ifmcaddr6 *mc)
 652{
 653        if (atomic_dec_and_test(&mc->mca_refcnt)) {
 654                in6_dev_put(mc->idev);
 655                kfree(mc);
 656        }
 657}
 658
 659static void igmp6_group_added(struct ifmcaddr6 *mc)
 660{
 661        struct net_device *dev = mc->idev->dev;
 662        char buf[MAX_ADDR_LEN];
 663
 664        spin_lock_bh(&mc->mca_lock);
 665        if (!(mc->mca_flags&MAF_LOADED)) {
 666                mc->mca_flags |= MAF_LOADED;
 667                if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 668                        dev_mc_add(dev, buf);
 669        }
 670        spin_unlock_bh(&mc->mca_lock);
 671
 672        if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 673                return;
 674
 675        if (MLD_V1_SEEN(mc->idev)) {
 676                igmp6_join_group(mc);
 677                return;
 678        }
 679        /* else v2 */
 680
 681        mc->mca_crcount = mc->idev->mc_qrv;
 682        mld_ifc_event(mc->idev);
 683}
 684
 685static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 686{
 687        struct net_device *dev = mc->idev->dev;
 688        char buf[MAX_ADDR_LEN];
 689
 690        spin_lock_bh(&mc->mca_lock);
 691        if (mc->mca_flags&MAF_LOADED) {
 692                mc->mca_flags &= ~MAF_LOADED;
 693                if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 694                        dev_mc_del(dev, buf);
 695        }
 696
 697        if (mc->mca_flags & MAF_NOREPORT)
 698                goto done;
 699        spin_unlock_bh(&mc->mca_lock);
 700
 701        if (!mc->idev->dead)
 702                igmp6_leave_group(mc);
 703
 704        spin_lock_bh(&mc->mca_lock);
 705        if (del_timer(&mc->mca_timer))
 706                atomic_dec(&mc->mca_refcnt);
 707done:
 708        ip6_mc_clear_src(mc);
 709        spin_unlock_bh(&mc->mca_lock);
 710}
 711
 712/*
 713 * deleted ifmcaddr6 manipulation
 714 */
 715static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 716{
 717        struct ifmcaddr6 *pmc;
 718
 719        /* this is an "ifmcaddr6" for convenience; only the fields below
 720         * are actually used. In particular, the refcnt and users are not
 721         * used for management of the delete list. Using the same structure
 722         * for deleted items allows change reports to use common code with
 723         * non-deleted or query-response MCA's.
 724         */
 725        pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 726        if (!pmc)
 727                return;
 728
 729        spin_lock_bh(&im->mca_lock);
 730        spin_lock_init(&pmc->mca_lock);
 731        pmc->idev = im->idev;
 732        in6_dev_hold(idev);
 733        pmc->mca_addr = im->mca_addr;
 734        pmc->mca_crcount = idev->mc_qrv;
 735        pmc->mca_sfmode = im->mca_sfmode;
 736        if (pmc->mca_sfmode == MCAST_INCLUDE) {
 737                struct ip6_sf_list *psf;
 738
 739                pmc->mca_tomb = im->mca_tomb;
 740                pmc->mca_sources = im->mca_sources;
 741                im->mca_tomb = im->mca_sources = NULL;
 742                for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 743                        psf->sf_crcount = pmc->mca_crcount;
 744        }
 745        spin_unlock_bh(&im->mca_lock);
 746
 747        spin_lock_bh(&idev->mc_lock);
 748        pmc->next = idev->mc_tomb;
 749        idev->mc_tomb = pmc;
 750        spin_unlock_bh(&idev->mc_lock);
 751}
 752
 753static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 754{
 755        struct ifmcaddr6 *pmc, *pmc_prev;
 756        struct ip6_sf_list *psf, *psf_next;
 757
 758        spin_lock_bh(&idev->mc_lock);
 759        pmc_prev = NULL;
 760        for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 761                if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 762                        break;
 763                pmc_prev = pmc;
 764        }
 765        if (pmc) {
 766                if (pmc_prev)
 767                        pmc_prev->next = pmc->next;
 768                else
 769                        idev->mc_tomb = pmc->next;
 770        }
 771        spin_unlock_bh(&idev->mc_lock);
 772
 773        if (pmc) {
 774                for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 775                        psf_next = psf->sf_next;
 776                        kfree(psf);
 777                }
 778                in6_dev_put(pmc->idev);
 779                kfree(pmc);
 780        }
 781}
 782
 783static void mld_clear_delrec(struct inet6_dev *idev)
 784{
 785        struct ifmcaddr6 *pmc, *nextpmc;
 786
 787        spin_lock_bh(&idev->mc_lock);
 788        pmc = idev->mc_tomb;
 789        idev->mc_tomb = NULL;
 790        spin_unlock_bh(&idev->mc_lock);
 791
 792        for (; pmc; pmc = nextpmc) {
 793                nextpmc = pmc->next;
 794                ip6_mc_clear_src(pmc);
 795                in6_dev_put(pmc->idev);
 796                kfree(pmc);
 797        }
 798
 799        /* clear dead sources, too */
 800        read_lock_bh(&idev->lock);
 801        for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 802                struct ip6_sf_list *psf, *psf_next;
 803
 804                spin_lock_bh(&pmc->mca_lock);
 805                psf = pmc->mca_tomb;
 806                pmc->mca_tomb = NULL;
 807                spin_unlock_bh(&pmc->mca_lock);
 808                for (; psf; psf=psf_next) {
 809                        psf_next = psf->sf_next;
 810                        kfree(psf);
 811                }
 812        }
 813        read_unlock_bh(&idev->lock);
 814}
 815
 816
 817/*
 818 *      device multicast group inc (add if not found)
 819 */
 820int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 821{
 822        struct ifmcaddr6 *mc;
 823        struct inet6_dev *idev;
 824
 825        /* we need to take a reference on idev */
 826        idev = in6_dev_get(dev);
 827
 828        if (idev == NULL)
 829                return -EINVAL;
 830
 831        write_lock_bh(&idev->lock);
 832        if (idev->dead) {
 833                write_unlock_bh(&idev->lock);
 834                in6_dev_put(idev);
 835                return -ENODEV;
 836        }
 837
 838        for (mc = idev->mc_list; mc; mc = mc->next) {
 839                if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 840                        mc->mca_users++;
 841                        write_unlock_bh(&idev->lock);
 842                        ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 843                                NULL, 0);
 844                        in6_dev_put(idev);
 845                        return 0;
 846                }
 847        }
 848
 849        /*
 850         *      not found: create a new one.
 851         */
 852
 853        mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 854
 855        if (mc == NULL) {
 856                write_unlock_bh(&idev->lock);
 857                in6_dev_put(idev);
 858                return -ENOMEM;
 859        }
 860
 861        setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 862
 863        mc->mca_addr = *addr;
 864        mc->idev = idev; /* (reference taken) */
 865        mc->mca_users = 1;
 866        /* mca_stamp should be updated upon changes */
 867        mc->mca_cstamp = mc->mca_tstamp = jiffies;
 868        atomic_set(&mc->mca_refcnt, 2);
 869        spin_lock_init(&mc->mca_lock);
 870
 871        /* initial mode is (EX, empty) */
 872        mc->mca_sfmode = MCAST_EXCLUDE;
 873        mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 874
 875        if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 876            IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 877                mc->mca_flags |= MAF_NOREPORT;
 878
 879        mc->next = idev->mc_list;
 880        idev->mc_list = mc;
 881        write_unlock_bh(&idev->lock);
 882
 883        mld_del_delrec(idev, &mc->mca_addr);
 884        igmp6_group_added(mc);
 885        ma_put(mc);
 886        return 0;
 887}
 888
 889/*
 890 *      device multicast group del
 891 */
 892int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 893{
 894        struct ifmcaddr6 *ma, **map;
 895
 896        write_lock_bh(&idev->lock);
 897        for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 898                if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 899                        if (--ma->mca_users == 0) {
 900                                *map = ma->next;
 901                                write_unlock_bh(&idev->lock);
 902
 903                                igmp6_group_dropped(ma);
 904
 905                                ma_put(ma);
 906                                return 0;
 907                        }
 908                        write_unlock_bh(&idev->lock);
 909                        return 0;
 910                }
 911        }
 912        write_unlock_bh(&idev->lock);
 913
 914        return -ENOENT;
 915}
 916
 917int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 918{
 919        struct inet6_dev *idev;
 920        int err;
 921
 922        rcu_read_lock();
 923
 924        idev = __in6_dev_get(dev);
 925        if (!idev)
 926                err = -ENODEV;
 927        else
 928                err = __ipv6_dev_mc_dec(idev, addr);
 929
 930        rcu_read_unlock();
 931        return err;
 932}
 933
 934/*
 935 * identify MLD packets for MLD filter exceptions
 936 */
 937bool ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 938{
 939        struct icmp6hdr *pic;
 940
 941        if (nexthdr != IPPROTO_ICMPV6)
 942                return false;
 943
 944        if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 945                return false;
 946
 947        pic = icmp6_hdr(skb);
 948
 949        switch (pic->icmp6_type) {
 950        case ICMPV6_MGM_QUERY:
 951        case ICMPV6_MGM_REPORT:
 952        case ICMPV6_MGM_REDUCTION:
 953        case ICMPV6_MLD2_REPORT:
 954                return true;
 955        default:
 956                break;
 957        }
 958        return false;
 959}
 960
 961/*
 962 *      check if the interface/address pair is valid
 963 */
 964bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 965                         const struct in6_addr *src_addr)
 966{
 967        struct inet6_dev *idev;
 968        struct ifmcaddr6 *mc;
 969        bool rv = false;
 970
 971        rcu_read_lock();
 972        idev = __in6_dev_get(dev);
 973        if (idev) {
 974                read_lock_bh(&idev->lock);
 975                for (mc = idev->mc_list; mc; mc=mc->next) {
 976                        if (ipv6_addr_equal(&mc->mca_addr, group))
 977                                break;
 978                }
 979                if (mc) {
 980                        if (src_addr && !ipv6_addr_any(src_addr)) {
 981                                struct ip6_sf_list *psf;
 982
 983                                spin_lock_bh(&mc->mca_lock);
 984                                for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 985                                        if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 986                                                break;
 987                                }
 988                                if (psf)
 989                                        rv = psf->sf_count[MCAST_INCLUDE] ||
 990                                                psf->sf_count[MCAST_EXCLUDE] !=
 991                                                mc->mca_sfcount[MCAST_EXCLUDE];
 992                                else
 993                                        rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 994                                spin_unlock_bh(&mc->mca_lock);
 995                        } else
 996                                rv = true; /* don't filter unspecified source */
 997                }
 998                read_unlock_bh(&idev->lock);
 999        }
1000        rcu_read_unlock();
1001        return rv;
1002}
1003
1004static void mld_gq_start_timer(struct inet6_dev *idev)
1005{
1006        int tv = net_random() % idev->mc_maxdelay;
1007
1008        idev->mc_gq_running = 1;
1009        if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1010                in6_dev_hold(idev);
1011}
1012
1013static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1014{
1015        int tv = net_random() % delay;
1016
1017        if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1018                in6_dev_hold(idev);
1019}
1020
1021/*
1022 *      IGMP handling (alias multicast ICMPv6 messages)
1023 */
1024
1025static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1026{
1027        unsigned long delay = resptime;
1028
1029        /* Do not start timer for these addresses */
1030        if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1031            IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1032                return;
1033
1034        if (del_timer(&ma->mca_timer)) {
1035                atomic_dec(&ma->mca_refcnt);
1036                delay = ma->mca_timer.expires - jiffies;
1037        }
1038
1039        if (delay >= resptime) {
1040                if (resptime)
1041                        delay = net_random() % resptime;
1042                else
1043                        delay = 1;
1044        }
1045        ma->mca_timer.expires = jiffies + delay;
1046        if (!mod_timer(&ma->mca_timer, jiffies + delay))
1047                atomic_inc(&ma->mca_refcnt);
1048        ma->mca_flags |= MAF_TIMER_RUNNING;
1049}
1050
1051/* mark EXCLUDE-mode sources */
1052static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1053                             const struct in6_addr *srcs)
1054{
1055        struct ip6_sf_list *psf;
1056        int i, scount;
1057
1058        scount = 0;
1059        for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1060                if (scount == nsrcs)
1061                        break;
1062                for (i=0; i<nsrcs; i++) {
1063                        /* skip inactive filters */
1064                        if (psf->sf_count[MCAST_INCLUDE] ||
1065                            pmc->mca_sfcount[MCAST_EXCLUDE] !=
1066                            psf->sf_count[MCAST_EXCLUDE])
1067                                break;
1068                        if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1069                                scount++;
1070                                break;
1071                        }
1072                }
1073        }
1074        pmc->mca_flags &= ~MAF_GSQUERY;
1075        if (scount == nsrcs)    /* all sources excluded */
1076                return false;
1077        return true;
1078}
1079
1080static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1081                            const struct in6_addr *srcs)
1082{
1083        struct ip6_sf_list *psf;
1084        int i, scount;
1085
1086        if (pmc->mca_sfmode == MCAST_EXCLUDE)
1087                return mld_xmarksources(pmc, nsrcs, srcs);
1088
1089        /* mark INCLUDE-mode sources */
1090
1091        scount = 0;
1092        for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1093                if (scount == nsrcs)
1094                        break;
1095                for (i=0; i<nsrcs; i++) {
1096                        if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1097                                psf->sf_gsresp = 1;
1098                                scount++;
1099                                break;
1100                        }
1101                }
1102        }
1103        if (!scount) {
1104                pmc->mca_flags &= ~MAF_GSQUERY;
1105                return false;
1106        }
1107        pmc->mca_flags |= MAF_GSQUERY;
1108        return true;
1109}
1110
1111/* called with rcu_read_lock() */
1112int igmp6_event_query(struct sk_buff *skb)
1113{
1114        struct mld2_query *mlh2 = NULL;
1115        struct ifmcaddr6 *ma;
1116        const struct in6_addr *group;
1117        unsigned long max_delay;
1118        struct inet6_dev *idev;
1119        struct mld_msg *mld;
1120        int group_type;
1121        int mark = 0;
1122        int len;
1123
1124        if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1125                return -EINVAL;
1126
1127        /* compute payload length excluding extension headers */
1128        len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1129        len -= skb_network_header_len(skb);
1130
1131        /* Drop queries with not link local source */
1132        if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1133                return -EINVAL;
1134
1135        idev = __in6_dev_get(skb->dev);
1136
1137        if (idev == NULL)
1138                return 0;
1139
1140        mld = (struct mld_msg *)icmp6_hdr(skb);
1141        group = &mld->mld_mca;
1142        group_type = ipv6_addr_type(group);
1143
1144        if (group_type != IPV6_ADDR_ANY &&
1145            !(group_type&IPV6_ADDR_MULTICAST))
1146                return -EINVAL;
1147
1148        if (len == 24) {
1149                int switchback;
1150                /* MLDv1 router present */
1151
1152                /* Translate milliseconds to jiffies */
1153                max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1154
1155                switchback = (idev->mc_qrv + 1) * max_delay;
1156                idev->mc_v1_seen = jiffies + switchback;
1157
1158                /* cancel the interface change timer */
1159                idev->mc_ifc_count = 0;
1160                if (del_timer(&idev->mc_ifc_timer))
1161                        __in6_dev_put(idev);
1162                /* clear deleted report items */
1163                mld_clear_delrec(idev);
1164        } else if (len >= 28) {
1165                int srcs_offset = sizeof(struct mld2_query) -
1166                                  sizeof(struct icmp6hdr);
1167                if (!pskb_may_pull(skb, srcs_offset))
1168                        return -EINVAL;
1169
1170                mlh2 = (struct mld2_query *)skb_transport_header(skb);
1171                max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1172                if (!max_delay)
1173                        max_delay = 1;
1174                idev->mc_maxdelay = max_delay;
1175                if (mlh2->mld2q_qrv)
1176                        idev->mc_qrv = mlh2->mld2q_qrv;
1177                if (group_type == IPV6_ADDR_ANY) { /* general query */
1178                        if (mlh2->mld2q_nsrcs)
1179                                return -EINVAL; /* no sources allowed */
1180
1181                        mld_gq_start_timer(idev);
1182                        return 0;
1183                }
1184                /* mark sources to include, if group & source-specific */
1185                if (mlh2->mld2q_nsrcs != 0) {
1186                        if (!pskb_may_pull(skb, srcs_offset +
1187                            ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1188                                return -EINVAL;
1189
1190                        mlh2 = (struct mld2_query *)skb_transport_header(skb);
1191                        mark = 1;
1192                }
1193        } else
1194                return -EINVAL;
1195
1196        read_lock_bh(&idev->lock);
1197        if (group_type == IPV6_ADDR_ANY) {
1198                for (ma = idev->mc_list; ma; ma=ma->next) {
1199                        spin_lock_bh(&ma->mca_lock);
1200                        igmp6_group_queried(ma, max_delay);
1201                        spin_unlock_bh(&ma->mca_lock);
1202                }
1203        } else {
1204                for (ma = idev->mc_list; ma; ma=ma->next) {
1205                        if (!ipv6_addr_equal(group, &ma->mca_addr))
1206                                continue;
1207                        spin_lock_bh(&ma->mca_lock);
1208                        if (ma->mca_flags & MAF_TIMER_RUNNING) {
1209                                /* gsquery <- gsquery && mark */
1210                                if (!mark)
1211                                        ma->mca_flags &= ~MAF_GSQUERY;
1212                        } else {
1213                                /* gsquery <- mark */
1214                                if (mark)
1215                                        ma->mca_flags |= MAF_GSQUERY;
1216                                else
1217                                        ma->mca_flags &= ~MAF_GSQUERY;
1218                        }
1219                        if (!(ma->mca_flags & MAF_GSQUERY) ||
1220                            mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1221                                igmp6_group_queried(ma, max_delay);
1222                        spin_unlock_bh(&ma->mca_lock);
1223                        break;
1224                }
1225        }
1226        read_unlock_bh(&idev->lock);
1227
1228        return 0;
1229}
1230
1231/* called with rcu_read_lock() */
1232int igmp6_event_report(struct sk_buff *skb)
1233{
1234        struct ifmcaddr6 *ma;
1235        struct inet6_dev *idev;
1236        struct mld_msg *mld;
1237        int addr_type;
1238
1239        /* Our own report looped back. Ignore it. */
1240        if (skb->pkt_type == PACKET_LOOPBACK)
1241                return 0;
1242
1243        /* send our report if the MC router may not have heard this report */
1244        if (skb->pkt_type != PACKET_MULTICAST &&
1245            skb->pkt_type != PACKET_BROADCAST)
1246                return 0;
1247
1248        if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1249                return -EINVAL;
1250
1251        mld = (struct mld_msg *)icmp6_hdr(skb);
1252
1253        /* Drop reports with not link local source */
1254        addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1255        if (addr_type != IPV6_ADDR_ANY &&
1256            !(addr_type&IPV6_ADDR_LINKLOCAL))
1257                return -EINVAL;
1258
1259        idev = __in6_dev_get(skb->dev);
1260        if (idev == NULL)
1261                return -ENODEV;
1262
1263        /*
1264         *      Cancel the timer for this group
1265         */
1266
1267        read_lock_bh(&idev->lock);
1268        for (ma = idev->mc_list; ma; ma=ma->next) {
1269                if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1270                        spin_lock(&ma->mca_lock);
1271                        if (del_timer(&ma->mca_timer))
1272                                atomic_dec(&ma->mca_refcnt);
1273                        ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1274                        spin_unlock(&ma->mca_lock);
1275                        break;
1276                }
1277        }
1278        read_unlock_bh(&idev->lock);
1279        return 0;
1280}
1281
1282static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1283                  int gdeleted, int sdeleted)
1284{
1285        switch (type) {
1286        case MLD2_MODE_IS_INCLUDE:
1287        case MLD2_MODE_IS_EXCLUDE:
1288                if (gdeleted || sdeleted)
1289                        return false;
1290                if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1291                        if (pmc->mca_sfmode == MCAST_INCLUDE)
1292                                return true;
1293                        /* don't include if this source is excluded
1294                         * in all filters
1295                         */
1296                        if (psf->sf_count[MCAST_INCLUDE])
1297                                return type == MLD2_MODE_IS_INCLUDE;
1298                        return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1299                                psf->sf_count[MCAST_EXCLUDE];
1300                }
1301                return false;
1302        case MLD2_CHANGE_TO_INCLUDE:
1303                if (gdeleted || sdeleted)
1304                        return false;
1305                return psf->sf_count[MCAST_INCLUDE] != 0;
1306        case MLD2_CHANGE_TO_EXCLUDE:
1307                if (gdeleted || sdeleted)
1308                        return false;
1309                if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1310                    psf->sf_count[MCAST_INCLUDE])
1311                        return false;
1312                return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1313                        psf->sf_count[MCAST_EXCLUDE];
1314        case MLD2_ALLOW_NEW_SOURCES:
1315                if (gdeleted || !psf->sf_crcount)
1316                        return false;
1317                return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1318        case MLD2_BLOCK_OLD_SOURCES:
1319                if (pmc->mca_sfmode == MCAST_INCLUDE)
1320                        return gdeleted || (psf->sf_crcount && sdeleted);
1321                return psf->sf_crcount && !gdeleted && !sdeleted;
1322        }
1323        return false;
1324}
1325
1326static int
1327mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1328{
1329        struct ip6_sf_list *psf;
1330        int scount = 0;
1331
1332        for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1333                if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1334                        continue;
1335                scount++;
1336        }
1337        return scount;
1338}
1339
1340static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1341{
1342        struct net *net = dev_net(dev);
1343        struct sock *sk = net->ipv6.igmp_sk;
1344        struct sk_buff *skb;
1345        struct mld2_report *pmr;
1346        struct in6_addr addr_buf;
1347        const struct in6_addr *saddr;
1348        int hlen = LL_RESERVED_SPACE(dev);
1349        int tlen = dev->needed_tailroom;
1350        int err;
1351        u8 ra[8] = { IPPROTO_ICMPV6, 0,
1352                     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1353                     IPV6_TLV_PADN, 0 };
1354
1355        /* we assume size > sizeof(ra) here */
1356        size += hlen + tlen;
1357        /* limit our allocations to order-0 page */
1358        size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1359        skb = sock_alloc_send_skb(sk, size, 1, &err);
1360
1361        if (!skb)
1362                return NULL;
1363
1364        skb_reserve(skb, hlen);
1365
1366        if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1367                /* <draft-ietf-magma-mld-source-05.txt>:
1368                 * use unspecified address as the source address
1369                 * when a valid link-local address is not available.
1370                 */
1371                saddr = &in6addr_any;
1372        } else
1373                saddr = &addr_buf;
1374
1375        ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1376
1377        memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1378
1379        skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1380        skb_put(skb, sizeof(*pmr));
1381        pmr = (struct mld2_report *)skb_transport_header(skb);
1382        pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1383        pmr->mld2r_resv1 = 0;
1384        pmr->mld2r_cksum = 0;
1385        pmr->mld2r_resv2 = 0;
1386        pmr->mld2r_ngrec = 0;
1387        return skb;
1388}
1389
1390static void mld_sendpack(struct sk_buff *skb)
1391{
1392        struct ipv6hdr *pip6 = ipv6_hdr(skb);
1393        struct mld2_report *pmr =
1394                              (struct mld2_report *)skb_transport_header(skb);
1395        int payload_len, mldlen;
1396        struct inet6_dev *idev;
1397        struct net *net = dev_net(skb->dev);
1398        int err;
1399        struct flowi6 fl6;
1400        struct dst_entry *dst;
1401
1402        rcu_read_lock();
1403        idev = __in6_dev_get(skb->dev);
1404        IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1405
1406        payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1407        mldlen = skb->tail - skb->transport_header;
1408        pip6->payload_len = htons(payload_len);
1409
1410        pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1411                                           IPPROTO_ICMPV6,
1412                                           csum_partial(skb_transport_header(skb),
1413                                                        mldlen, 0));
1414
1415        icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1416                         &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1417                         skb->dev->ifindex);
1418        dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1419
1420        err = 0;
1421        if (IS_ERR(dst)) {
1422                err = PTR_ERR(dst);
1423                dst = NULL;
1424        }
1425        skb_dst_set(skb, dst);
1426        if (err)
1427                goto err_out;
1428
1429        payload_len = skb->len;
1430
1431        err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1432                      dst_output);
1433out:
1434        if (!err) {
1435                ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1436                ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1437                IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1438        } else
1439                IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1440
1441        rcu_read_unlock();
1442        return;
1443
1444err_out:
1445        kfree_skb(skb);
1446        goto out;
1447}
1448
1449static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1450{
1451        return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1452}
1453
1454static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1455        int type, struct mld2_grec **ppgr)
1456{
1457        struct net_device *dev = pmc->idev->dev;
1458        struct mld2_report *pmr;
1459        struct mld2_grec *pgr;
1460
1461        if (!skb)
1462                skb = mld_newpack(dev, dev->mtu);
1463        if (!skb)
1464                return NULL;
1465        pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1466        pgr->grec_type = type;
1467        pgr->grec_auxwords = 0;
1468        pgr->grec_nsrcs = 0;
1469        pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1470        pmr = (struct mld2_report *)skb_transport_header(skb);
1471        pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1472        *ppgr = pgr;
1473        return skb;
1474}
1475
1476#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1477        skb_tailroom(skb)) : 0)
1478
1479static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1480        int type, int gdeleted, int sdeleted)
1481{
1482        struct net_device *dev = pmc->idev->dev;
1483        struct mld2_report *pmr;
1484        struct mld2_grec *pgr = NULL;
1485        struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1486        int scount, stotal, first, isquery, truncate;
1487
1488        if (pmc->mca_flags & MAF_NOREPORT)
1489                return skb;
1490
1491        isquery = type == MLD2_MODE_IS_INCLUDE ||
1492                  type == MLD2_MODE_IS_EXCLUDE;
1493        truncate = type == MLD2_MODE_IS_EXCLUDE ||
1494                    type == MLD2_CHANGE_TO_EXCLUDE;
1495
1496        stotal = scount = 0;
1497
1498        psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1499
1500        if (!*psf_list)
1501                goto empty_source;
1502
1503        pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1504
1505        /* EX and TO_EX get a fresh packet, if needed */
1506        if (truncate) {
1507                if (pmr && pmr->mld2r_ngrec &&
1508                    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1509                        if (skb)
1510                                mld_sendpack(skb);
1511                        skb = mld_newpack(dev, dev->mtu);
1512                }
1513        }
1514        first = 1;
1515        psf_prev = NULL;
1516        for (psf=*psf_list; psf; psf=psf_next) {
1517                struct in6_addr *psrc;
1518
1519                psf_next = psf->sf_next;
1520
1521                if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1522                        psf_prev = psf;
1523                        continue;
1524                }
1525
1526                /* clear marks on query responses */
1527                if (isquery)
1528                        psf->sf_gsresp = 0;
1529
1530                if (AVAILABLE(skb) < sizeof(*psrc) +
1531                    first*sizeof(struct mld2_grec)) {
1532                        if (truncate && !first)
1533                                break;   /* truncate these */
1534                        if (pgr)
1535                                pgr->grec_nsrcs = htons(scount);
1536                        if (skb)
1537                                mld_sendpack(skb);
1538                        skb = mld_newpack(dev, dev->mtu);
1539                        first = 1;
1540                        scount = 0;
1541                }
1542                if (first) {
1543                        skb = add_grhead(skb, pmc, type, &pgr);
1544                        first = 0;
1545                }
1546                if (!skb)
1547                        return NULL;
1548                psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1549                *psrc = psf->sf_addr;
1550                scount++; stotal++;
1551                if ((type == MLD2_ALLOW_NEW_SOURCES ||
1552                     type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1553                        psf->sf_crcount--;
1554                        if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1555                                if (psf_prev)
1556                                        psf_prev->sf_next = psf->sf_next;
1557                                else
1558                                        *psf_list = psf->sf_next;
1559                                kfree(psf);
1560                                continue;
1561                        }
1562                }
1563                psf_prev = psf;
1564        }
1565
1566empty_source:
1567        if (!stotal) {
1568                if (type == MLD2_ALLOW_NEW_SOURCES ||
1569                    type == MLD2_BLOCK_OLD_SOURCES)
1570                        return skb;
1571                if (pmc->mca_crcount || isquery) {
1572                        /* make sure we have room for group header */
1573                        if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1574                                mld_sendpack(skb);
1575                                skb = NULL; /* add_grhead will get a new one */
1576                        }
1577                        skb = add_grhead(skb, pmc, type, &pgr);
1578                }
1579        }
1580        if (pgr)
1581                pgr->grec_nsrcs = htons(scount);
1582
1583        if (isquery)
1584                pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1585        return skb;
1586}
1587
1588static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1589{
1590        struct sk_buff *skb = NULL;
1591        int type;
1592
1593        if (!pmc) {
1594                read_lock_bh(&idev->lock);
1595                for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1596                        if (pmc->mca_flags & MAF_NOREPORT)
1597                                continue;
1598                        spin_lock_bh(&pmc->mca_lock);
1599                        if (pmc->mca_sfcount[MCAST_EXCLUDE])
1600                                type = MLD2_MODE_IS_EXCLUDE;
1601                        else
1602                                type = MLD2_MODE_IS_INCLUDE;
1603                        skb = add_grec(skb, pmc, type, 0, 0);
1604                        spin_unlock_bh(&pmc->mca_lock);
1605                }
1606                read_unlock_bh(&idev->lock);
1607        } else {
1608                spin_lock_bh(&pmc->mca_lock);
1609                if (pmc->mca_sfcount[MCAST_EXCLUDE])
1610                        type = MLD2_MODE_IS_EXCLUDE;
1611                else
1612                        type = MLD2_MODE_IS_INCLUDE;
1613                skb = add_grec(skb, pmc, type, 0, 0);
1614                spin_unlock_bh(&pmc->mca_lock);
1615        }
1616        if (skb)
1617                mld_sendpack(skb);
1618}
1619
1620/*
1621 * remove zero-count source records from a source filter list
1622 */
1623static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1624{
1625        struct ip6_sf_list *psf_prev, *psf_next, *psf;
1626
1627        psf_prev = NULL;
1628        for (psf=*ppsf; psf; psf = psf_next) {
1629                psf_next = psf->sf_next;
1630                if (psf->sf_crcount == 0) {
1631                        if (psf_prev)
1632                                psf_prev->sf_next = psf->sf_next;
1633                        else
1634                                *ppsf = psf->sf_next;
1635                        kfree(psf);
1636                } else
1637                        psf_prev = psf;
1638        }
1639}
1640
1641static void mld_send_cr(struct inet6_dev *idev)
1642{
1643        struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1644        struct sk_buff *skb = NULL;
1645        int type, dtype;
1646
1647        read_lock_bh(&idev->lock);
1648        spin_lock(&idev->mc_lock);
1649
1650        /* deleted MCA's */
1651        pmc_prev = NULL;
1652        for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1653                pmc_next = pmc->next;
1654                if (pmc->mca_sfmode == MCAST_INCLUDE) {
1655                        type = MLD2_BLOCK_OLD_SOURCES;
1656                        dtype = MLD2_BLOCK_OLD_SOURCES;
1657                        skb = add_grec(skb, pmc, type, 1, 0);
1658                        skb = add_grec(skb, pmc, dtype, 1, 1);
1659                }
1660                if (pmc->mca_crcount) {
1661                        if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1662                                type = MLD2_CHANGE_TO_INCLUDE;
1663                                skb = add_grec(skb, pmc, type, 1, 0);
1664                        }
1665                        pmc->mca_crcount--;
1666                        if (pmc->mca_crcount == 0) {
1667                                mld_clear_zeros(&pmc->mca_tomb);
1668                                mld_clear_zeros(&pmc->mca_sources);
1669                        }
1670                }
1671                if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1672                    !pmc->mca_sources) {
1673                        if (pmc_prev)
1674                                pmc_prev->next = pmc_next;
1675                        else
1676                                idev->mc_tomb = pmc_next;
1677                        in6_dev_put(pmc->idev);
1678                        kfree(pmc);
1679                } else
1680                        pmc_prev = pmc;
1681        }
1682        spin_unlock(&idev->mc_lock);
1683
1684        /* change recs */
1685        for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1686                spin_lock_bh(&pmc->mca_lock);
1687                if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1688                        type = MLD2_BLOCK_OLD_SOURCES;
1689                        dtype = MLD2_ALLOW_NEW_SOURCES;
1690                } else {
1691                        type = MLD2_ALLOW_NEW_SOURCES;
1692                        dtype = MLD2_BLOCK_OLD_SOURCES;
1693                }
1694                skb = add_grec(skb, pmc, type, 0, 0);
1695                skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1696
1697                /* filter mode changes */
1698                if (pmc->mca_crcount) {
1699                        if (pmc->mca_sfmode == MCAST_EXCLUDE)
1700                                type = MLD2_CHANGE_TO_EXCLUDE;
1701                        else
1702                                type = MLD2_CHANGE_TO_INCLUDE;
1703                        skb = add_grec(skb, pmc, type, 0, 0);
1704                        pmc->mca_crcount--;
1705                }
1706                spin_unlock_bh(&pmc->mca_lock);
1707        }
1708        read_unlock_bh(&idev->lock);
1709        if (!skb)
1710                return;
1711        (void) mld_sendpack(skb);
1712}
1713
1714static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1715{
1716        struct net *net = dev_net(dev);
1717        struct sock *sk = net->ipv6.igmp_sk;
1718        struct inet6_dev *idev;
1719        struct sk_buff *skb;
1720        struct mld_msg *hdr;
1721        const struct in6_addr *snd_addr, *saddr;
1722        struct in6_addr addr_buf;
1723        int hlen = LL_RESERVED_SPACE(dev);
1724        int tlen = dev->needed_tailroom;
1725        int err, len, payload_len, full_len;
1726        u8 ra[8] = { IPPROTO_ICMPV6, 0,
1727                     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1728                     IPV6_TLV_PADN, 0 };
1729        struct flowi6 fl6;
1730        struct dst_entry *dst;
1731
1732        if (type == ICMPV6_MGM_REDUCTION)
1733                snd_addr = &in6addr_linklocal_allrouters;
1734        else
1735                snd_addr = addr;
1736
1737        len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1738        payload_len = len + sizeof(ra);
1739        full_len = sizeof(struct ipv6hdr) + payload_len;
1740
1741        rcu_read_lock();
1742        IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1743                      IPSTATS_MIB_OUT, full_len);
1744        rcu_read_unlock();
1745
1746        skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1747
1748        if (skb == NULL) {
1749                rcu_read_lock();
1750                IP6_INC_STATS(net, __in6_dev_get(dev),
1751                              IPSTATS_MIB_OUTDISCARDS);
1752                rcu_read_unlock();
1753                return;
1754        }
1755
1756        skb_reserve(skb, hlen);
1757
1758        if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1759                /* <draft-ietf-magma-mld-source-05.txt>:
1760                 * use unspecified address as the source address
1761                 * when a valid link-local address is not available.
1762                 */
1763                saddr = &in6addr_any;
1764        } else
1765                saddr = &addr_buf;
1766
1767        ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1768
1769        memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1770
1771        hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1772        memset(hdr, 0, sizeof(struct mld_msg));
1773        hdr->mld_type = type;
1774        hdr->mld_mca = *addr;
1775
1776        hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1777                                         IPPROTO_ICMPV6,
1778                                         csum_partial(hdr, len, 0));
1779
1780        rcu_read_lock();
1781        idev = __in6_dev_get(skb->dev);
1782
1783        icmpv6_flow_init(sk, &fl6, type,
1784                         &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1785                         skb->dev->ifindex);
1786        dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1787        if (IS_ERR(dst)) {
1788                err = PTR_ERR(dst);
1789                goto err_out;
1790        }
1791
1792        skb_dst_set(skb, dst);
1793        err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1794                      dst_output);
1795out:
1796        if (!err) {
1797                ICMP6MSGOUT_INC_STATS(net, idev, type);
1798                ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1799                IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1800        } else
1801                IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1802
1803        rcu_read_unlock();
1804        return;
1805
1806err_out:
1807        kfree_skb(skb);
1808        goto out;
1809}
1810
1811static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1812        const struct in6_addr *psfsrc)
1813{
1814        struct ip6_sf_list *psf, *psf_prev;
1815        int rv = 0;
1816
1817        psf_prev = NULL;
1818        for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1819                if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1820                        break;
1821                psf_prev = psf;
1822        }
1823        if (!psf || psf->sf_count[sfmode] == 0) {
1824                /* source filter not found, or count wrong =>  bug */
1825                return -ESRCH;
1826        }
1827        psf->sf_count[sfmode]--;
1828        if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1829                struct inet6_dev *idev = pmc->idev;
1830
1831                /* no more filters for this source */
1832                if (psf_prev)
1833                        psf_prev->sf_next = psf->sf_next;
1834                else
1835                        pmc->mca_sources = psf->sf_next;
1836                if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1837                    !MLD_V1_SEEN(idev)) {
1838                        psf->sf_crcount = idev->mc_qrv;
1839                        psf->sf_next = pmc->mca_tomb;
1840                        pmc->mca_tomb = psf;
1841                        rv = 1;
1842                } else
1843                        kfree(psf);
1844        }
1845        return rv;
1846}
1847
1848static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1849                          int sfmode, int sfcount, const struct in6_addr *psfsrc,
1850                          int delta)
1851{
1852        struct ifmcaddr6 *pmc;
1853        int     changerec = 0;
1854        int     i, err;
1855
1856        if (!idev)
1857                return -ENODEV;
1858        read_lock_bh(&idev->lock);
1859        for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1860                if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1861                        break;
1862        }
1863        if (!pmc) {
1864                /* MCA not found?? bug */
1865                read_unlock_bh(&idev->lock);
1866                return -ESRCH;
1867        }
1868        spin_lock_bh(&pmc->mca_lock);
1869        sf_markstate(pmc);
1870        if (!delta) {
1871                if (!pmc->mca_sfcount[sfmode]) {
1872                        spin_unlock_bh(&pmc->mca_lock);
1873                        read_unlock_bh(&idev->lock);
1874                        return -EINVAL;
1875                }
1876                pmc->mca_sfcount[sfmode]--;
1877        }
1878        err = 0;
1879        for (i=0; i<sfcount; i++) {
1880                int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1881
1882                changerec |= rv > 0;
1883                if (!err && rv < 0)
1884                        err = rv;
1885        }
1886        if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1887            pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1888            pmc->mca_sfcount[MCAST_INCLUDE]) {
1889                struct ip6_sf_list *psf;
1890
1891                /* filter mode change */
1892                pmc->mca_sfmode = MCAST_INCLUDE;
1893                pmc->mca_crcount = idev->mc_qrv;
1894                idev->mc_ifc_count = pmc->mca_crcount;
1895                for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1896                        psf->sf_crcount = 0;
1897                mld_ifc_event(pmc->idev);
1898        } else if (sf_setstate(pmc) || changerec)
1899                mld_ifc_event(pmc->idev);
1900        spin_unlock_bh(&pmc->mca_lock);
1901        read_unlock_bh(&idev->lock);
1902        return err;
1903}
1904
1905/*
1906 * Add multicast single-source filter to the interface list
1907 */
1908static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1909        const struct in6_addr *psfsrc)
1910{
1911        struct ip6_sf_list *psf, *psf_prev;
1912
1913        psf_prev = NULL;
1914        for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1915                if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1916                        break;
1917                psf_prev = psf;
1918        }
1919        if (!psf) {
1920                psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1921                if (!psf)
1922                        return -ENOBUFS;
1923
1924                psf->sf_addr = *psfsrc;
1925                if (psf_prev) {
1926                        psf_prev->sf_next = psf;
1927                } else
1928                        pmc->mca_sources = psf;
1929        }
1930        psf->sf_count[sfmode]++;
1931        return 0;
1932}
1933
1934static void sf_markstate(struct ifmcaddr6 *pmc)
1935{
1936        struct ip6_sf_list *psf;
1937        int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1938
1939        for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1940                if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1941                        psf->sf_oldin = mca_xcount ==
1942                                psf->sf_count[MCAST_EXCLUDE] &&
1943                                !psf->sf_count[MCAST_INCLUDE];
1944                } else
1945                        psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1946}
1947
1948static int sf_setstate(struct ifmcaddr6 *pmc)
1949{
1950        struct ip6_sf_list *psf, *dpsf;
1951        int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1952        int qrv = pmc->idev->mc_qrv;
1953        int new_in, rv;
1954
1955        rv = 0;
1956        for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1957                if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1958                        new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1959                                !psf->sf_count[MCAST_INCLUDE];
1960                } else
1961                        new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1962                if (new_in) {
1963                        if (!psf->sf_oldin) {
1964                                struct ip6_sf_list *prev = NULL;
1965
1966                                for (dpsf=pmc->mca_tomb; dpsf;
1967                                     dpsf=dpsf->sf_next) {
1968                                        if (ipv6_addr_equal(&dpsf->sf_addr,
1969                                            &psf->sf_addr))
1970                                                break;
1971                                        prev = dpsf;
1972                                }
1973                                if (dpsf) {
1974                                        if (prev)
1975                                                prev->sf_next = dpsf->sf_next;
1976                                        else
1977                                                pmc->mca_tomb = dpsf->sf_next;
1978                                        kfree(dpsf);
1979                                }
1980                                psf->sf_crcount = qrv;
1981                                rv++;
1982                        }
1983                } else if (psf->sf_oldin) {
1984                        psf->sf_crcount = 0;
1985                        /*
1986                         * add or update "delete" records if an active filter
1987                         * is now inactive
1988                         */
1989                        for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1990                                if (ipv6_addr_equal(&dpsf->sf_addr,
1991                                    &psf->sf_addr))
1992                                        break;
1993                        if (!dpsf) {
1994                                dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1995                                if (!dpsf)
1996                                        continue;
1997                                *dpsf = *psf;
1998                                /* pmc->mca_lock held by callers */
1999                                dpsf->sf_next = pmc->mca_tomb;
2000                                pmc->mca_tomb = dpsf;
2001                        }
2002                        dpsf->sf_crcount = qrv;
2003                        rv++;
2004                }
2005        }
2006        return rv;
2007}
2008
2009/*
2010 * Add multicast source filter list to the interface list
2011 */
2012static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2013                          int sfmode, int sfcount, const struct in6_addr *psfsrc,
2014                          int delta)
2015{
2016        struct ifmcaddr6 *pmc;
2017        int     isexclude;
2018        int     i, err;
2019
2020        if (!idev)
2021                return -ENODEV;
2022        read_lock_bh(&idev->lock);
2023        for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2024                if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2025                        break;
2026        }
2027        if (!pmc) {
2028                /* MCA not found?? bug */
2029                read_unlock_bh(&idev->lock);
2030                return -ESRCH;
2031        }
2032        spin_lock_bh(&pmc->mca_lock);
2033
2034        sf_markstate(pmc);
2035        isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2036        if (!delta)
2037                pmc->mca_sfcount[sfmode]++;
2038        err = 0;
2039        for (i=0; i<sfcount; i++) {
2040                err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2041                if (err)
2042                        break;
2043        }
2044        if (err) {
2045                int j;
2046
2047                if (!delta)
2048                        pmc->mca_sfcount[sfmode]--;
2049                for (j=0; j<i; j++)
2050                        ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2051        } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2052                struct ip6_sf_list *psf;
2053
2054                /* filter mode change */
2055                if (pmc->mca_sfcount[MCAST_EXCLUDE])
2056                        pmc->mca_sfmode = MCAST_EXCLUDE;
2057                else if (pmc->mca_sfcount[MCAST_INCLUDE])
2058                        pmc->mca_sfmode = MCAST_INCLUDE;
2059                /* else no filters; keep old mode for reports */
2060
2061                pmc->mca_crcount = idev->mc_qrv;
2062                idev->mc_ifc_count = pmc->mca_crcount;
2063                for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2064                        psf->sf_crcount = 0;
2065                mld_ifc_event(idev);
2066        } else if (sf_setstate(pmc))
2067                mld_ifc_event(idev);
2068        spin_unlock_bh(&pmc->mca_lock);
2069        read_unlock_bh(&idev->lock);
2070        return err;
2071}
2072
2073static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2074{
2075        struct ip6_sf_list *psf, *nextpsf;
2076
2077        for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2078                nextpsf = psf->sf_next;
2079                kfree(psf);
2080        }
2081        pmc->mca_tomb = NULL;
2082        for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2083                nextpsf = psf->sf_next;
2084                kfree(psf);
2085        }
2086        pmc->mca_sources = NULL;
2087        pmc->mca_sfmode = MCAST_EXCLUDE;
2088        pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2089        pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2090}
2091
2092
2093static void igmp6_join_group(struct ifmcaddr6 *ma)
2094{
2095        unsigned long delay;
2096
2097        if (ma->mca_flags & MAF_NOREPORT)
2098                return;
2099
2100        igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2101
2102        delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2103
2104        spin_lock_bh(&ma->mca_lock);
2105        if (del_timer(&ma->mca_timer)) {
2106                atomic_dec(&ma->mca_refcnt);
2107                delay = ma->mca_timer.expires - jiffies;
2108        }
2109
2110        if (!mod_timer(&ma->mca_timer, jiffies + delay))
2111                atomic_inc(&ma->mca_refcnt);
2112        ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2113        spin_unlock_bh(&ma->mca_lock);
2114}
2115
2116static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2117                            struct inet6_dev *idev)
2118{
2119        int err;
2120
2121        /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2122         * so no other readers or writers of iml or its sflist
2123         */
2124        if (!iml->sflist) {
2125                /* any-source empty exclude case */
2126                return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2127        }
2128        err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2129                iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2130        sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2131        iml->sflist = NULL;
2132        return err;
2133}
2134
2135static void igmp6_leave_group(struct ifmcaddr6 *ma)
2136{
2137        if (MLD_V1_SEEN(ma->idev)) {
2138                if (ma->mca_flags & MAF_LAST_REPORTER)
2139                        igmp6_send(&ma->mca_addr, ma->idev->dev,
2140                                ICMPV6_MGM_REDUCTION);
2141        } else {
2142                mld_add_delrec(ma->idev, ma);
2143                mld_ifc_event(ma->idev);
2144        }
2145}
2146
2147static void mld_gq_timer_expire(unsigned long data)
2148{
2149        struct inet6_dev *idev = (struct inet6_dev *)data;
2150
2151        idev->mc_gq_running = 0;
2152        mld_send_report(idev, NULL);
2153        __in6_dev_put(idev);
2154}
2155
2156static void mld_ifc_timer_expire(unsigned long data)
2157{
2158        struct inet6_dev *idev = (struct inet6_dev *)data;
2159
2160        mld_send_cr(idev);
2161        if (idev->mc_ifc_count) {
2162                idev->mc_ifc_count--;
2163                if (idev->mc_ifc_count)
2164                        mld_ifc_start_timer(idev, idev->mc_maxdelay);
2165        }
2166        __in6_dev_put(idev);
2167}
2168
2169static void mld_ifc_event(struct inet6_dev *idev)
2170{
2171        if (MLD_V1_SEEN(idev))
2172                return;
2173        idev->mc_ifc_count = idev->mc_qrv;
2174        mld_ifc_start_timer(idev, 1);
2175}
2176
2177
2178static void igmp6_timer_handler(unsigned long data)
2179{
2180        struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2181
2182        if (MLD_V1_SEEN(ma->idev))
2183                igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2184        else
2185                mld_send_report(ma->idev, ma);
2186
2187        spin_lock(&ma->mca_lock);
2188        ma->mca_flags |=  MAF_LAST_REPORTER;
2189        ma->mca_flags &= ~MAF_TIMER_RUNNING;
2190        spin_unlock(&ma->mca_lock);
2191        ma_put(ma);
2192}
2193
2194/* Device changing type */
2195
2196void ipv6_mc_unmap(struct inet6_dev *idev)
2197{
2198        struct ifmcaddr6 *i;
2199
2200        /* Install multicast list, except for all-nodes (already installed) */
2201
2202        read_lock_bh(&idev->lock);
2203        for (i = idev->mc_list; i; i = i->next)
2204                igmp6_group_dropped(i);
2205        read_unlock_bh(&idev->lock);
2206}
2207
2208void ipv6_mc_remap(struct inet6_dev *idev)
2209{
2210        ipv6_mc_up(idev);
2211}
2212
2213/* Device going down */
2214
2215void ipv6_mc_down(struct inet6_dev *idev)
2216{
2217        struct ifmcaddr6 *i;
2218
2219        /* Withdraw multicast list */
2220
2221        read_lock_bh(&idev->lock);
2222        idev->mc_ifc_count = 0;
2223        if (del_timer(&idev->mc_ifc_timer))
2224                __in6_dev_put(idev);
2225        idev->mc_gq_running = 0;
2226        if (del_timer(&idev->mc_gq_timer))
2227                __in6_dev_put(idev);
2228
2229        for (i = idev->mc_list; i; i=i->next)
2230                igmp6_group_dropped(i);
2231        read_unlock_bh(&idev->lock);
2232
2233        mld_clear_delrec(idev);
2234}
2235
2236
2237/* Device going up */
2238
2239void ipv6_mc_up(struct inet6_dev *idev)
2240{
2241        struct ifmcaddr6 *i;
2242
2243        /* Install multicast list, except for all-nodes (already installed) */
2244
2245        read_lock_bh(&idev->lock);
2246        for (i = idev->mc_list; i; i=i->next)
2247                igmp6_group_added(i);
2248        read_unlock_bh(&idev->lock);
2249}
2250
2251/* IPv6 device initialization. */
2252
2253void ipv6_mc_init_dev(struct inet6_dev *idev)
2254{
2255        write_lock_bh(&idev->lock);
2256        spin_lock_init(&idev->mc_lock);
2257        idev->mc_gq_running = 0;
2258        setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2259                        (unsigned long)idev);
2260        idev->mc_tomb = NULL;
2261        idev->mc_ifc_count = 0;
2262        setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2263                        (unsigned long)idev);
2264        idev->mc_qrv = MLD_QRV_DEFAULT;
2265        idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2266        idev->mc_v1_seen = 0;
2267        write_unlock_bh(&idev->lock);
2268}
2269
2270/*
2271 *      Device is about to be destroyed: clean up.
2272 */
2273
2274void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2275{
2276        struct ifmcaddr6 *i;
2277
2278        /* Deactivate timers */
2279        ipv6_mc_down(idev);
2280
2281        /* Delete all-nodes address. */
2282        /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2283         * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2284         * fail.
2285         */
2286        __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2287
2288        if (idev->cnf.forwarding)
2289                __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2290
2291        write_lock_bh(&idev->lock);
2292        while ((i = idev->mc_list) != NULL) {
2293                idev->mc_list = i->next;
2294                write_unlock_bh(&idev->lock);
2295
2296                igmp6_group_dropped(i);
2297                ma_put(i);
2298
2299                write_lock_bh(&idev->lock);
2300        }
2301        write_unlock_bh(&idev->lock);
2302}
2303
2304#ifdef CONFIG_PROC_FS
2305struct igmp6_mc_iter_state {
2306        struct seq_net_private p;
2307        struct net_device *dev;
2308        struct inet6_dev *idev;
2309};
2310
2311#define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2312
2313static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2314{
2315        struct ifmcaddr6 *im = NULL;
2316        struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2317        struct net *net = seq_file_net(seq);
2318
2319        state->idev = NULL;
2320        for_each_netdev_rcu(net, state->dev) {
2321                struct inet6_dev *idev;
2322                idev = __in6_dev_get(state->dev);
2323                if (!idev)
2324                        continue;
2325                read_lock_bh(&idev->lock);
2326                im = idev->mc_list;
2327                if (im) {
2328                        state->idev = idev;
2329                        break;
2330                }
2331                read_unlock_bh(&idev->lock);
2332        }
2333        return im;
2334}
2335
2336static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2337{
2338        struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2339
2340        im = im->next;
2341        while (!im) {
2342                if (likely(state->idev != NULL))
2343                        read_unlock_bh(&state->idev->lock);
2344
2345                state->dev = next_net_device_rcu(state->dev);
2346                if (!state->dev) {
2347                        state->idev = NULL;
2348                        break;
2349                }
2350                state->idev = __in6_dev_get(state->dev);
2351                if (!state->idev)
2352                        continue;
2353                read_lock_bh(&state->idev->lock);
2354                im = state->idev->mc_list;
2355        }
2356        return im;
2357}
2358
2359static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2360{
2361        struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2362        if (im)
2363                while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2364                        --pos;
2365        return pos ? NULL : im;
2366}
2367
2368static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2369        __acquires(RCU)
2370{
2371        rcu_read_lock();
2372        return igmp6_mc_get_idx(seq, *pos);
2373}
2374
2375static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2376{
2377        struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2378
2379        ++*pos;
2380        return im;
2381}
2382
2383static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2384        __releases(RCU)
2385{
2386        struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2387
2388        if (likely(state->idev != NULL)) {
2389                read_unlock_bh(&state->idev->lock);
2390                state->idev = NULL;
2391        }
2392        state->dev = NULL;
2393        rcu_read_unlock();
2394}
2395
2396static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2397{
2398        struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2399        struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2400
2401        seq_printf(seq,
2402                   "%-4d %-15s %pi6 %5d %08X %ld\n",
2403                   state->dev->ifindex, state->dev->name,
2404                   &im->mca_addr,
2405                   im->mca_users, im->mca_flags,
2406                   (im->mca_flags&MAF_TIMER_RUNNING) ?
2407                   jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2408        return 0;
2409}
2410
2411static const struct seq_operations igmp6_mc_seq_ops = {
2412        .start  =       igmp6_mc_seq_start,
2413        .next   =       igmp6_mc_seq_next,
2414        .stop   =       igmp6_mc_seq_stop,
2415        .show   =       igmp6_mc_seq_show,
2416};
2417
2418static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2419{
2420        return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2421                            sizeof(struct igmp6_mc_iter_state));
2422}
2423
2424static const struct file_operations igmp6_mc_seq_fops = {
2425        .owner          =       THIS_MODULE,
2426        .open           =       igmp6_mc_seq_open,
2427        .read           =       seq_read,
2428        .llseek         =       seq_lseek,
2429        .release        =       seq_release_net,
2430};
2431
2432struct igmp6_mcf_iter_state {
2433        struct seq_net_private p;
2434        struct net_device *dev;
2435        struct inet6_dev *idev;
2436        struct ifmcaddr6 *im;
2437};
2438
2439#define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2440
2441static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2442{
2443        struct ip6_sf_list *psf = NULL;
2444        struct ifmcaddr6 *im = NULL;
2445        struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2446        struct net *net = seq_file_net(seq);
2447
2448        state->idev = NULL;
2449        state->im = NULL;
2450        for_each_netdev_rcu(net, state->dev) {
2451                struct inet6_dev *idev;
2452                idev = __in6_dev_get(state->dev);
2453                if (unlikely(idev == NULL))
2454                        continue;
2455                read_lock_bh(&idev->lock);
2456                im = idev->mc_list;
2457                if (likely(im != NULL)) {
2458                        spin_lock_bh(&im->mca_lock);
2459                        psf = im->mca_sources;
2460                        if (likely(psf != NULL)) {
2461                                state->im = im;
2462                                state->idev = idev;
2463                                break;
2464                        }
2465                        spin_unlock_bh(&im->mca_lock);
2466                }
2467                read_unlock_bh(&idev->lock);
2468        }
2469        return psf;
2470}
2471
2472static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2473{
2474        struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2475
2476        psf = psf->sf_next;
2477        while (!psf) {
2478                spin_unlock_bh(&state->im->mca_lock);
2479                state->im = state->im->next;
2480                while (!state->im) {
2481                        if (likely(state->idev != NULL))
2482                                read_unlock_bh(&state->idev->lock);
2483
2484                        state->dev = next_net_device_rcu(state->dev);
2485                        if (!state->dev) {
2486                                state->idev = NULL;
2487                                goto out;
2488                        }
2489                        state->idev = __in6_dev_get(state->dev);
2490                        if (!state->idev)
2491                                continue;
2492                        read_lock_bh(&state->idev->lock);
2493                        state->im = state->idev->mc_list;
2494                }
2495                if (!state->im)
2496                        break;
2497                spin_lock_bh(&state->im->mca_lock);
2498                psf = state->im->mca_sources;
2499        }
2500out:
2501        return psf;
2502}
2503
2504static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2505{
2506        struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2507        if (psf)
2508                while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2509                        --pos;
2510        return pos ? NULL : psf;
2511}
2512
2513static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2514        __acquires(RCU)
2515{
2516        rcu_read_lock();
2517        return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2518}
2519
2520static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2521{
2522        struct ip6_sf_list *psf;
2523        if (v == SEQ_START_TOKEN)
2524                psf = igmp6_mcf_get_first(seq);
2525        else
2526                psf = igmp6_mcf_get_next(seq, v);
2527        ++*pos;
2528        return psf;
2529}
2530
2531static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2532        __releases(RCU)
2533{
2534        struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2535        if (likely(state->im != NULL)) {
2536                spin_unlock_bh(&state->im->mca_lock);
2537                state->im = NULL;
2538        }
2539        if (likely(state->idev != NULL)) {
2540                read_unlock_bh(&state->idev->lock);
2541                state->idev = NULL;
2542        }
2543        state->dev = NULL;
2544        rcu_read_unlock();
2545}
2546
2547static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2548{
2549        struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2550        struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2551
2552        if (v == SEQ_START_TOKEN) {
2553                seq_printf(seq,
2554                           "%3s %6s "
2555                           "%32s %32s %6s %6s\n", "Idx",
2556                           "Device", "Multicast Address",
2557                           "Source Address", "INC", "EXC");
2558        } else {
2559                seq_printf(seq,
2560                           "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2561                           state->dev->ifindex, state->dev->name,
2562                           &state->im->mca_addr,
2563                           &psf->sf_addr,
2564                           psf->sf_count[MCAST_INCLUDE],
2565                           psf->sf_count[MCAST_EXCLUDE]);
2566        }
2567        return 0;
2568}
2569
2570static const struct seq_operations igmp6_mcf_seq_ops = {
2571        .start  =       igmp6_mcf_seq_start,
2572        .next   =       igmp6_mcf_seq_next,
2573        .stop   =       igmp6_mcf_seq_stop,
2574        .show   =       igmp6_mcf_seq_show,
2575};
2576
2577static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2578{
2579        return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2580                            sizeof(struct igmp6_mcf_iter_state));
2581}
2582
2583static const struct file_operations igmp6_mcf_seq_fops = {
2584        .owner          =       THIS_MODULE,
2585        .open           =       igmp6_mcf_seq_open,
2586        .read           =       seq_read,
2587        .llseek         =       seq_lseek,
2588        .release        =       seq_release_net,
2589};
2590
2591static int __net_init igmp6_proc_init(struct net *net)
2592{
2593        int err;
2594
2595        err = -ENOMEM;
2596        if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2597                goto out;
2598        if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2599                                  &igmp6_mcf_seq_fops))
2600                goto out_proc_net_igmp6;
2601
2602        err = 0;
2603out:
2604        return err;
2605
2606out_proc_net_igmp6:
2607        proc_net_remove(net, "igmp6");
2608        goto out;
2609}
2610
2611static void __net_exit igmp6_proc_exit(struct net *net)
2612{
2613        proc_net_remove(net, "mcfilter6");
2614        proc_net_remove(net, "igmp6");
2615}
2616#else
2617static inline int igmp6_proc_init(struct net *net)
2618{
2619        return 0;
2620}
2621static inline void igmp6_proc_exit(struct net *net)
2622{
2623}
2624#endif
2625
2626static int __net_init igmp6_net_init(struct net *net)
2627{
2628        int err;
2629
2630        err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2631                                   SOCK_RAW, IPPROTO_ICMPV6, net);
2632        if (err < 0) {
2633                pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2634                       err);
2635                goto out;
2636        }
2637
2638        inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2639
2640        err = igmp6_proc_init(net);
2641        if (err)
2642                goto out_sock_create;
2643out:
2644        return err;
2645
2646out_sock_create:
2647        inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2648        goto out;
2649}
2650
2651static void __net_exit igmp6_net_exit(struct net *net)
2652{
2653        inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2654        igmp6_proc_exit(net);
2655}
2656
2657static struct pernet_operations igmp6_net_ops = {
2658        .init = igmp6_net_init,
2659        .exit = igmp6_net_exit,
2660};
2661
2662int __init igmp6_init(void)
2663{
2664        return register_pernet_subsys(&igmp6_net_ops);
2665}
2666
2667void igmp6_cleanup(void)
2668{
2669        unregister_pernet_subsys(&igmp6_net_ops);
2670}
2671
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