net/ipv6/mcast.c

   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. */
  76 static 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
  82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  83
  84 /* Big mc list lock for all the sockets */
  85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  86
  87 static void igmp6_join_group(struct ifmcaddr6 *ma);
  88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  89 static void igmp6_timer_handler(unsigned long data);
  90
  91 static void mld_gq_timer_expire(unsigned long data);
  92 static void mld_ifc_timer_expire(unsigned long data);
  93 static void mld_ifc_event(struct inet6_dev *idev);
  94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  95 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  96 static void mld_clear_delrec(struct inet6_dev *idev);
  97 static int sf_setstate(struct ifmcaddr6 *pmc);
  98 static void sf_markstate(struct ifmcaddr6 *pmc);
  99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 100 static 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);
 103 static 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);
 106 static 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
 120 int 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
 131 int 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         ipv6_addr_copy(&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->rt6i_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  */
 207 int 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         spin_lock(&ipv6_sk_mc_lock);
 215         for (lnk = &np->ipv6_mc_list;
 216              (mc_lst = rcu_dereference_protected(*lnk,
 217                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 218               lnk = &mc_lst->next) {
 219                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 220                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 221                         struct net_device *dev;
 222
 223                         *lnk = mc_lst->next;
 224                         spin_unlock(&ipv6_sk_mc_lock);
 225
 226                         rcu_read_lock();
 227                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 228                         if (dev != NULL) {
 229                                 struct inet6_dev *idev = __in6_dev_get(dev);
 230
 231                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 232                                 if (idev)
 233                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 234                         } else
 235                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 236                         rcu_read_unlock();
 237                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 238                         kfree_rcu(mc_lst, rcu);
 239                         return 0;
 240                 }
 241         }
 242         spin_unlock(&ipv6_sk_mc_lock);
 243
 244         return -EADDRNOTAVAIL;
 245 }
 246
 247 /* called with rcu_read_lock() */
 248 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 249                                              const struct in6_addr *group,
 250                                              int ifindex)
 251 {
 252         struct net_device *dev = NULL;
 253         struct inet6_dev *idev = NULL;
 254
 255         if (ifindex == 0) {
 256                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 257
 258                 if (rt) {
 259                         dev = rt->rt6i_dev;
 260                         dev_hold(dev);
 261                         dst_release(&rt->dst);
 262                 }
 263         } else
 264                 dev = dev_get_by_index_rcu(net, ifindex);
 265
 266         if (!dev)
 267                 return NULL;
 268         idev = __in6_dev_get(dev);
 269         if (!idev)
 270                 return NULL;
 271         read_lock_bh(&idev->lock);
 272         if (idev->dead) {
 273                 read_unlock_bh(&idev->lock);
 274                 return NULL;
 275         }
 276         return idev;
 277 }
 278
 279 void ipv6_sock_mc_close(struct sock *sk)
 280 {
 281         struct ipv6_pinfo *np = inet6_sk(sk);
 282         struct ipv6_mc_socklist *mc_lst;
 283         struct net *net = sock_net(sk);
 284
 285         spin_lock(&ipv6_sk_mc_lock);
 286         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 287                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 288                 struct net_device *dev;
 289
 290                 np->ipv6_mc_list = mc_lst->next;
 291                 spin_unlock(&ipv6_sk_mc_lock);
 292
 293                 rcu_read_lock();
 294                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 295                 if (dev) {
 296                         struct inet6_dev *idev = __in6_dev_get(dev);
 297
 298                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 299                         if (idev)
 300                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 301                 } else
 302                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 303                 rcu_read_unlock();
 304
 305                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 306                 kfree_rcu(mc_lst, rcu);
 307
 308                 spin_lock(&ipv6_sk_mc_lock);
 309         }
 310         spin_unlock(&ipv6_sk_mc_lock);
 311 }
 312
 313 int ip6_mc_source(int add, int omode, struct sock *sk,
 314         struct group_source_req *pgsr)
 315 {
 316         struct in6_addr *source, *group;
 317         struct ipv6_mc_socklist *pmc;
 318         struct inet6_dev *idev;
 319         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 320         struct ip6_sf_socklist *psl;
 321         struct net *net = sock_net(sk);
 322         int i, j, rv;
 323         int leavegroup = 0;
 324         int pmclocked = 0;
 325         int err;
 326
 327         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 328         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 329
 330         if (!ipv6_addr_is_multicast(group))
 331                 return -EINVAL;
 332
 333         rcu_read_lock();
 334         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 335         if (!idev) {
 336                 rcu_read_unlock();
 337                 return -ENODEV;
 338         }
 339
 340         err = -EADDRNOTAVAIL;
 341
 342         for_each_pmc_rcu(inet6, pmc) {
 343                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 344                         continue;
 345                 if (ipv6_addr_equal(&pmc->addr, group))
 346                         break;
 347         }
 348         if (!pmc) {             /* must have a prior join */
 349                 err = -EINVAL;
 350                 goto done;
 351         }
 352         /* if a source filter was set, must be the same mode as before */
 353         if (pmc->sflist) {
 354                 if (pmc->sfmode != omode) {
 355                         err = -EINVAL;
 356                         goto done;
 357                 }
 358         } else if (pmc->sfmode != omode) {
 359                 /* allow mode switches for empty-set filters */
 360                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 361                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 362                 pmc->sfmode = omode;
 363         }
 364
 365         write_lock(&pmc->sflock);
 366         pmclocked = 1;
 367
 368         psl = pmc->sflist;
 369         if (!add) {
 370                 if (!psl)
 371                         goto done;      /* err = -EADDRNOTAVAIL */
 372                 rv = !0;
 373                 for (i=0; i<psl->sl_count; i++) {
 374                         rv = memcmp(&psl->sl_addr[i], source,
 375                                 sizeof(struct in6_addr));
 376                         if (rv == 0)
 377                                 break;
 378                 }
 379                 if (rv)         /* source not found */
 380                         goto done;      /* err = -EADDRNOTAVAIL */
 381
 382                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 383                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 384                         leavegroup = 1;
 385                         goto done;
 386                 }
 387
 388                 /* update the interface filter */
 389                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 390
 391                 for (j=i+1; j<psl->sl_count; j++)
 392                         psl->sl_addr[j-1] = psl->sl_addr[j];
 393                 psl->sl_count--;
 394                 err = 0;
 395                 goto done;
 396         }
 397         /* else, add a new source to the filter */
 398
 399         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 400                 err = -ENOBUFS;
 401                 goto done;
 402         }
 403         if (!psl || psl->sl_count == psl->sl_max) {
 404                 struct ip6_sf_socklist *newpsl;
 405                 int count = IP6_SFBLOCK;
 406
 407                 if (psl)
 408                         count += psl->sl_max;
 409                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 410                 if (!newpsl) {
 411                         err = -ENOBUFS;
 412                         goto done;
 413                 }
 414                 newpsl->sl_max = count;
 415                 newpsl->sl_count = count - IP6_SFBLOCK;
 416                 if (psl) {
 417                         for (i=0; i<psl->sl_count; i++)
 418                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 419                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 420                 }
 421                 pmc->sflist = psl = newpsl;
 422         }
 423         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 424         for (i=0; i<psl->sl_count; i++) {
 425                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 426                 if (rv == 0)
 427                         break;
 428         }
 429         if (rv == 0)            /* address already there is an error */
 430                 goto done;
 431         for (j=psl->sl_count-1; j>=i; j--)
 432                 psl->sl_addr[j+1] = psl->sl_addr[j];
 433         psl->sl_addr[i] = *source;
 434         psl->sl_count++;
 435         err = 0;
 436         /* update the interface list */
 437         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 438 done:
 439         if (pmclocked)
 440                 write_unlock(&pmc->sflock);
 441         read_unlock_bh(&idev->lock);
 442         rcu_read_unlock();
 443         if (leavegroup)
 444                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 445         return err;
 446 }
 447
 448 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 449 {
 450         const struct in6_addr *group;
 451         struct ipv6_mc_socklist *pmc;
 452         struct inet6_dev *idev;
 453         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 454         struct ip6_sf_socklist *newpsl, *psl;
 455         struct net *net = sock_net(sk);
 456         int leavegroup = 0;
 457         int i, err;
 458
 459         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 460
 461         if (!ipv6_addr_is_multicast(group))
 462                 return -EINVAL;
 463         if (gsf->gf_fmode != MCAST_INCLUDE &&
 464             gsf->gf_fmode != MCAST_EXCLUDE)
 465                 return -EINVAL;
 466
 467         rcu_read_lock();
 468         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 469
 470         if (!idev) {
 471                 rcu_read_unlock();
 472                 return -ENODEV;
 473         }
 474
 475         err = 0;
 476
 477         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 478                 leavegroup = 1;
 479                 goto done;
 480         }
 481
 482         for_each_pmc_rcu(inet6, pmc) {
 483                 if (pmc->ifindex != gsf->gf_interface)
 484                         continue;
 485                 if (ipv6_addr_equal(&pmc->addr, group))
 486                         break;
 487         }
 488         if (!pmc) {             /* must have a prior join */
 489                 err = -EINVAL;
 490                 goto done;
 491         }
 492         if (gsf->gf_numsrc) {
 493                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 494                                                           GFP_ATOMIC);
 495                 if (!newpsl) {
 496                         err = -ENOBUFS;
 497                         goto done;
 498                 }
 499                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 500                 for (i=0; i<newpsl->sl_count; ++i) {
 501                         struct sockaddr_in6 *psin6;
 502
 503                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 504                         newpsl->sl_addr[i] = psin6->sin6_addr;
 505                 }
 506                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 507                         newpsl->sl_count, newpsl->sl_addr, 0);
 508                 if (err) {
 509                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 510                         goto done;
 511                 }
 512         } else {
 513                 newpsl = NULL;
 514                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 515         }
 516
 517         write_lock(&pmc->sflock);
 518         psl = pmc->sflist;
 519         if (psl) {
 520                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 521                         psl->sl_count, psl->sl_addr, 0);
 522                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 523         } else
 524                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 525         pmc->sflist = newpsl;
 526         pmc->sfmode = gsf->gf_fmode;
 527         write_unlock(&pmc->sflock);
 528         err = 0;
 529 done:
 530         read_unlock_bh(&idev->lock);
 531         rcu_read_unlock();
 532         if (leavegroup)
 533                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 534         return err;
 535 }
 536
 537 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 538         struct group_filter __user *optval, int __user *optlen)
 539 {
 540         int err, i, count, copycount;
 541         const struct in6_addr *group;
 542         struct ipv6_mc_socklist *pmc;
 543         struct inet6_dev *idev;
 544         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 545         struct ip6_sf_socklist *psl;
 546         struct net *net = sock_net(sk);
 547
 548         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 549
 550         if (!ipv6_addr_is_multicast(group))
 551                 return -EINVAL;
 552
 553         rcu_read_lock();
 554         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 555
 556         if (!idev) {
 557                 rcu_read_unlock();
 558                 return -ENODEV;
 559         }
 560
 561         err = -EADDRNOTAVAIL;
 562         /*
 563          * changes to the ipv6_mc_list require the socket lock and
 564          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 565          * so reading the list is safe.
 566          */
 567
 568         for_each_pmc_rcu(inet6, pmc) {
 569                 if (pmc->ifindex != gsf->gf_interface)
 570                         continue;
 571                 if (ipv6_addr_equal(group, &pmc->addr))
 572                         break;
 573         }
 574         if (!pmc)               /* must have a prior join */
 575                 goto done;
 576         gsf->gf_fmode = pmc->sfmode;
 577         psl = pmc->sflist;
 578         count = psl ? psl->sl_count : 0;
 579         read_unlock_bh(&idev->lock);
 580         rcu_read_unlock();
 581
 582         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 583         gsf->gf_numsrc = count;
 584         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 585             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 586                 return -EFAULT;
 587         }
 588         /* changes to psl require the socket lock, a read lock on
 589          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 590          * have the socket lock, so reading here is safe.
 591          */
 592         for (i=0; i<copycount; i++) {
 593                 struct sockaddr_in6 *psin6;
 594                 struct sockaddr_storage ss;
 595
 596                 psin6 = (struct sockaddr_in6 *)&ss;
 597                 memset(&ss, 0, sizeof(ss));
 598                 psin6->sin6_family = AF_INET6;
 599                 psin6->sin6_addr = psl->sl_addr[i];
 600                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 601                         return -EFAULT;
 602         }
 603         return 0;
 604 done:
 605         read_unlock_bh(&idev->lock);
 606         rcu_read_unlock();
 607         return err;
 608 }
 609
 610 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 611                    const struct in6_addr *src_addr)
 612 {
 613         struct ipv6_pinfo *np = inet6_sk(sk);
 614         struct ipv6_mc_socklist *mc;
 615         struct ip6_sf_socklist *psl;
 616         int rv = 1;
 617
 618         rcu_read_lock();
 619         for_each_pmc_rcu(np, mc) {
 620                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 621                         break;
 622         }
 623         if (!mc) {
 624                 rcu_read_unlock();
 625                 return 1;
 626         }
 627         read_lock(&mc->sflock);
 628         psl = mc->sflist;
 629         if (!psl) {
 630                 rv = mc->sfmode == MCAST_EXCLUDE;
 631         } else {
 632                 int i;
 633
 634                 for (i=0; i<psl->sl_count; i++) {
 635                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 636                                 break;
 637                 }
 638                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 639                         rv = 0;
 640                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 641                         rv = 0;
 642         }
 643         read_unlock(&mc->sflock);
 644         rcu_read_unlock();
 645
 646         return rv;
 647 }
 648
 649 static void ma_put(struct ifmcaddr6 *mc)
 650 {
 651         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 652                 in6_dev_put(mc->idev);
 653                 kfree(mc);
 654         }
 655 }
 656
 657 static void igmp6_group_added(struct ifmcaddr6 *mc)
 658 {
 659         struct net_device *dev = mc->idev->dev;
 660         char buf[MAX_ADDR_LEN];
 661
 662         spin_lock_bh(&mc->mca_lock);
 663         if (!(mc->mca_flags&MAF_LOADED)) {
 664                 mc->mca_flags |= MAF_LOADED;
 665                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 666                         dev_mc_add(dev, buf);
 667         }
 668         spin_unlock_bh(&mc->mca_lock);
 669
 670         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 671                 return;
 672
 673         if (MLD_V1_SEEN(mc->idev)) {
 674                 igmp6_join_group(mc);
 675                 return;
 676         }
 677         /* else v2 */
 678
 679         mc->mca_crcount = mc->idev->mc_qrv;
 680         mld_ifc_event(mc->idev);
 681 }
 682
 683 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 684 {
 685         struct net_device *dev = mc->idev->dev;
 686         char buf[MAX_ADDR_LEN];
 687
 688         spin_lock_bh(&mc->mca_lock);
 689         if (mc->mca_flags&MAF_LOADED) {
 690                 mc->mca_flags &= ~MAF_LOADED;
 691                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 692                         dev_mc_del(dev, buf);
 693         }
 694
 695         if (mc->mca_flags & MAF_NOREPORT)
 696                 goto done;
 697         spin_unlock_bh(&mc->mca_lock);
 698
 699         if (!mc->idev->dead)
 700                 igmp6_leave_group(mc);
 701
 702         spin_lock_bh(&mc->mca_lock);
 703         if (del_timer(&mc->mca_timer))
 704                 atomic_dec(&mc->mca_refcnt);
 705 done:
 706         ip6_mc_clear_src(mc);
 707         spin_unlock_bh(&mc->mca_lock);
 708 }
 709
 710 /*
 711  * deleted ifmcaddr6 manipulation
 712  */
 713 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 714 {
 715         struct ifmcaddr6 *pmc;
 716
 717         /* this is an "ifmcaddr6" for convenience; only the fields below
 718          * are actually used. In particular, the refcnt and users are not
 719          * used for management of the delete list. Using the same structure
 720          * for deleted items allows change reports to use common code with
 721          * non-deleted or query-response MCA's.
 722          */
 723         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 724         if (!pmc)
 725                 return;
 726
 727         spin_lock_bh(&im->mca_lock);
 728         spin_lock_init(&pmc->mca_lock);
 729         pmc->idev = im->idev;
 730         in6_dev_hold(idev);
 731         pmc->mca_addr = im->mca_addr;
 732         pmc->mca_crcount = idev->mc_qrv;
 733         pmc->mca_sfmode = im->mca_sfmode;
 734         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 735                 struct ip6_sf_list *psf;
 736
 737                 pmc->mca_tomb = im->mca_tomb;
 738                 pmc->mca_sources = im->mca_sources;
 739                 im->mca_tomb = im->mca_sources = NULL;
 740                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 741                         psf->sf_crcount = pmc->mca_crcount;
 742         }
 743         spin_unlock_bh(&im->mca_lock);
 744
 745         spin_lock_bh(&idev->mc_lock);
 746         pmc->next = idev->mc_tomb;
 747         idev->mc_tomb = pmc;
 748         spin_unlock_bh(&idev->mc_lock);
 749 }
 750
 751 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 752 {
 753         struct ifmcaddr6 *pmc, *pmc_prev;
 754         struct ip6_sf_list *psf, *psf_next;
 755
 756         spin_lock_bh(&idev->mc_lock);
 757         pmc_prev = NULL;
 758         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 759                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 760                         break;
 761                 pmc_prev = pmc;
 762         }
 763         if (pmc) {
 764                 if (pmc_prev)
 765                         pmc_prev->next = pmc->next;
 766                 else
 767                         idev->mc_tomb = pmc->next;
 768         }
 769         spin_unlock_bh(&idev->mc_lock);
 770
 771         if (pmc) {
 772                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 773                         psf_next = psf->sf_next;
 774                         kfree(psf);
 775                 }
 776                 in6_dev_put(pmc->idev);
 777                 kfree(pmc);
 778         }
 779 }
 780
 781 static void mld_clear_delrec(struct inet6_dev *idev)
 782 {
 783         struct ifmcaddr6 *pmc, *nextpmc;
 784
 785         spin_lock_bh(&idev->mc_lock);
 786         pmc = idev->mc_tomb;
 787         idev->mc_tomb = NULL;
 788         spin_unlock_bh(&idev->mc_lock);
 789
 790         for (; pmc; pmc = nextpmc) {
 791                 nextpmc = pmc->next;
 792                 ip6_mc_clear_src(pmc);
 793                 in6_dev_put(pmc->idev);
 794                 kfree(pmc);
 795         }
 796
 797         /* clear dead sources, too */
 798         read_lock_bh(&idev->lock);
 799         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 800                 struct ip6_sf_list *psf, *psf_next;
 801
 802                 spin_lock_bh(&pmc->mca_lock);
 803                 psf = pmc->mca_tomb;
 804                 pmc->mca_tomb = NULL;
 805                 spin_unlock_bh(&pmc->mca_lock);
 806                 for (; psf; psf=psf_next) {
 807                         psf_next = psf->sf_next;
 808                         kfree(psf);
 809                 }
 810         }
 811         read_unlock_bh(&idev->lock);
 812 }
 813
 814
 815 /*
 816  *      device multicast group inc (add if not found)
 817  */
 818 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 819 {
 820         struct ifmcaddr6 *mc;
 821         struct inet6_dev *idev;
 822
 823         /* we need to take a reference on idev */
 824         idev = in6_dev_get(dev);
 825
 826         if (idev == NULL)
 827                 return -EINVAL;
 828
 829         write_lock_bh(&idev->lock);
 830         if (idev->dead) {
 831                 write_unlock_bh(&idev->lock);
 832                 in6_dev_put(idev);
 833                 return -ENODEV;
 834         }
 835
 836         for (mc = idev->mc_list; mc; mc = mc->next) {
 837                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 838                         mc->mca_users++;
 839                         write_unlock_bh(&idev->lock);
 840                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 841                                 NULL, 0);
 842                         in6_dev_put(idev);
 843                         return 0;
 844                 }
 845         }
 846
 847         /*
 848          *      not found: create a new one.
 849          */
 850
 851         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 852
 853         if (mc == NULL) {
 854                 write_unlock_bh(&idev->lock);
 855                 in6_dev_put(idev);
 856                 return -ENOMEM;
 857         }
 858
 859         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 860
 861         ipv6_addr_copy(&mc->mca_addr, addr);
 862         mc->idev = idev; /* (reference taken) */
 863         mc->mca_users = 1;
 864         /* mca_stamp should be updated upon changes */
 865         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 866         atomic_set(&mc->mca_refcnt, 2);
 867         spin_lock_init(&mc->mca_lock);
 868
 869         /* initial mode is (EX, empty) */
 870         mc->mca_sfmode = MCAST_EXCLUDE;
 871         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 872
 873         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 874             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 875                 mc->mca_flags |= MAF_NOREPORT;
 876
 877         mc->next = idev->mc_list;
 878         idev->mc_list = mc;
 879         write_unlock_bh(&idev->lock);
 880
 881         mld_del_delrec(idev, &mc->mca_addr);
 882         igmp6_group_added(mc);
 883         ma_put(mc);
 884         return 0;
 885 }
 886
 887 /*
 888  *      device multicast group del
 889  */
 890 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 891 {
 892         struct ifmcaddr6 *ma, **map;
 893
 894         write_lock_bh(&idev->lock);
 895         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 896                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 897                         if (--ma->mca_users == 0) {
 898                                 *map = ma->next;
 899                                 write_unlock_bh(&idev->lock);
 900
 901                                 igmp6_group_dropped(ma);
 902
 903                                 ma_put(ma);
 904                                 return 0;
 905                         }
 906                         write_unlock_bh(&idev->lock);
 907                         return 0;
 908                 }
 909         }
 910         write_unlock_bh(&idev->lock);
 911
 912         return -ENOENT;
 913 }
 914
 915 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 916 {
 917         struct inet6_dev *idev;
 918         int err;
 919
 920         rcu_read_lock();
 921
 922         idev = __in6_dev_get(dev);
 923         if (!idev)
 924                 err = -ENODEV;
 925         else
 926                 err = __ipv6_dev_mc_dec(idev, addr);
 927
 928         rcu_read_unlock();
 929         return err;
 930 }
 931
 932 /*
 933  * identify MLD packets for MLD filter exceptions
 934  */
 935 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 936 {
 937         struct icmp6hdr *pic;
 938
 939         if (nexthdr != IPPROTO_ICMPV6)
 940                 return 0;
 941
 942         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 943                 return 0;
 944
 945         pic = icmp6_hdr(skb);
 946
 947         switch (pic->icmp6_type) {
 948         case ICMPV6_MGM_QUERY:
 949         case ICMPV6_MGM_REPORT:
 950         case ICMPV6_MGM_REDUCTION:
 951         case ICMPV6_MLD2_REPORT:
 952                 return 1;
 953         default:
 954                 break;
 955         }
 956         return 0;
 957 }
 958
 959 /*
 960  *      check if the interface/address pair is valid
 961  */
 962 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 963                         const struct in6_addr *src_addr)
 964 {
 965         struct inet6_dev *idev;
 966         struct ifmcaddr6 *mc;
 967         int rv = 0;
 968
 969         rcu_read_lock();
 970         idev = __in6_dev_get(dev);
 971         if (idev) {
 972                 read_lock_bh(&idev->lock);
 973                 for (mc = idev->mc_list; mc; mc=mc->next) {
 974                         if (ipv6_addr_equal(&mc->mca_addr, group))
 975                                 break;
 976                 }
 977                 if (mc) {
 978                         if (src_addr && !ipv6_addr_any(src_addr)) {
 979                                 struct ip6_sf_list *psf;
 980
 981                                 spin_lock_bh(&mc->mca_lock);
 982                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 983                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 984                                                 break;
 985                                 }
 986                                 if (psf)
 987                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 988                                                 psf->sf_count[MCAST_EXCLUDE] !=
 989                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 990                                 else
 991                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 992                                 spin_unlock_bh(&mc->mca_lock);
 993                         } else
 994                                 rv = 1; /* don't filter unspecified source */
 995                 }
 996                 read_unlock_bh(&idev->lock);
 997         }
 998         rcu_read_unlock();
 999         return rv;
1000 }
1001
1002 static void mld_gq_start_timer(struct inet6_dev *idev)
1003 {
1004         int tv = net_random() % idev->mc_maxdelay;
1005
1006         idev->mc_gq_running = 1;
1007         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1008                 in6_dev_hold(idev);
1009 }
1010
1011 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1012 {
1013         int tv = net_random() % delay;
1014
1015         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1016                 in6_dev_hold(idev);
1017 }
1018
1019 /*
1020  *      IGMP handling (alias multicast ICMPv6 messages)
1021  */
1022
1023 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1024 {
1025         unsigned long delay = resptime;
1026
1027         /* Do not start timer for these addresses */
1028         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1029             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1030                 return;
1031
1032         if (del_timer(&ma->mca_timer)) {
1033                 atomic_dec(&ma->mca_refcnt);
1034                 delay = ma->mca_timer.expires - jiffies;
1035         }
1036
1037         if (delay >= resptime) {
1038                 if (resptime)
1039                         delay = net_random() % resptime;
1040                 else
1041                         delay = 1;
1042         }
1043         ma->mca_timer.expires = jiffies + delay;
1044         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1045                 atomic_inc(&ma->mca_refcnt);
1046         ma->mca_flags |= MAF_TIMER_RUNNING;
1047 }
1048
1049 /* mark EXCLUDE-mode sources */
1050 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1051         const struct in6_addr *srcs)
1052 {
1053         struct ip6_sf_list *psf;
1054         int i, scount;
1055
1056         scount = 0;
1057         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1058                 if (scount == nsrcs)
1059                         break;
1060                 for (i=0; i<nsrcs; i++) {
1061                         /* skip inactive filters */
1062                         if (psf->sf_count[MCAST_INCLUDE] ||
1063                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1064                             psf->sf_count[MCAST_EXCLUDE])
1065                                 continue;
1066                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1067                                 scount++;
1068                                 break;
1069                         }
1070                 }
1071         }
1072         pmc->mca_flags &= ~MAF_GSQUERY;
1073         if (scount == nsrcs)    /* all sources excluded */
1074                 return 0;
1075         return 1;
1076 }
1077
1078 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1079         const struct in6_addr *srcs)
1080 {
1081         struct ip6_sf_list *psf;
1082         int i, scount;
1083
1084         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1085                 return mld_xmarksources(pmc, nsrcs, srcs);
1086
1087         /* mark INCLUDE-mode sources */
1088
1089         scount = 0;
1090         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1091                 if (scount == nsrcs)
1092                         break;
1093                 for (i=0; i<nsrcs; i++) {
1094                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1095                                 psf->sf_gsresp = 1;
1096                                 scount++;
1097                                 break;
1098                         }
1099                 }
1100         }
1101         if (!scount) {
1102                 pmc->mca_flags &= ~MAF_GSQUERY;
1103                 return 0;
1104         }
1105         pmc->mca_flags |= MAF_GSQUERY;
1106         return 1;
1107 }
1108
1109 /* called with rcu_read_lock() */
1110 int igmp6_event_query(struct sk_buff *skb)
1111 {
1112         struct mld2_query *mlh2 = NULL;
1113         struct ifmcaddr6 *ma;
1114         const struct in6_addr *group;
1115         unsigned long max_delay;
1116         struct inet6_dev *idev;
1117         struct mld_msg *mld;
1118         int group_type;
1119         int mark = 0;
1120         int len;
1121
1122         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1123                 return -EINVAL;
1124
1125         /* compute payload length excluding extension headers */
1126         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1127         len -= skb_network_header_len(skb);
1128
1129         /* Drop queries with not link local source */
1130         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1131                 return -EINVAL;
1132
1133         idev = __in6_dev_get(skb->dev);
1134
1135         if (idev == NULL)
1136                 return 0;
1137
1138         mld = (struct mld_msg *)icmp6_hdr(skb);
1139         group = &mld->mld_mca;
1140         group_type = ipv6_addr_type(group);
1141
1142         if (group_type != IPV6_ADDR_ANY &&
1143             !(group_type&IPV6_ADDR_MULTICAST))
1144                 return -EINVAL;
1145
1146         if (len == 24) {
1147                 int switchback;
1148                 /* MLDv1 router present */
1149
1150                 /* Translate milliseconds to jiffies */
1151                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1152
1153                 switchback = (idev->mc_qrv + 1) * max_delay;
1154                 idev->mc_v1_seen = jiffies + switchback;
1155
1156                 /* cancel the interface change timer */
1157                 idev->mc_ifc_count = 0;
1158                 if (del_timer(&idev->mc_ifc_timer))
1159                         __in6_dev_put(idev);
1160                 /* clear deleted report items */
1161                 mld_clear_delrec(idev);
1162         } else if (len >= 28) {
1163                 int srcs_offset = sizeof(struct mld2_query) -
1164                                   sizeof(struct icmp6hdr);
1165                 if (!pskb_may_pull(skb, srcs_offset))
1166                         return -EINVAL;
1167
1168                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1169                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1170                 if (!max_delay)
1171                         max_delay = 1;
1172                 idev->mc_maxdelay = max_delay;
1173                 if (mlh2->mld2q_qrv)
1174                         idev->mc_qrv = mlh2->mld2q_qrv;
1175                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1176                         if (mlh2->mld2q_nsrcs)
1177                                 return -EINVAL; /* no sources allowed */
1178
1179                         mld_gq_start_timer(idev);
1180                         return 0;
1181                 }
1182                 /* mark sources to include, if group & source-specific */
1183                 if (mlh2->mld2q_nsrcs != 0) {
1184                         if (!pskb_may_pull(skb, srcs_offset +
1185                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1186                                 return -EINVAL;
1187
1188                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1189                         mark = 1;
1190                 }
1191         } else
1192                 return -EINVAL;
1193
1194         read_lock_bh(&idev->lock);
1195         if (group_type == IPV6_ADDR_ANY) {
1196                 for (ma = idev->mc_list; ma; ma=ma->next) {
1197                         spin_lock_bh(&ma->mca_lock);
1198                         igmp6_group_queried(ma, max_delay);
1199                         spin_unlock_bh(&ma->mca_lock);
1200                 }
1201         } else {
1202                 for (ma = idev->mc_list; ma; ma=ma->next) {
1203                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1204                                 continue;
1205                         spin_lock_bh(&ma->mca_lock);
1206                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1207                                 /* gsquery <- gsquery && mark */
1208                                 if (!mark)
1209                                         ma->mca_flags &= ~MAF_GSQUERY;
1210                         } else {
1211                                 /* gsquery <- mark */
1212                                 if (mark)
1213                                         ma->mca_flags |= MAF_GSQUERY;
1214                                 else
1215                                         ma->mca_flags &= ~MAF_GSQUERY;
1216                         }
1217                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1218                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1219                                 igmp6_group_queried(ma, max_delay);
1220                         spin_unlock_bh(&ma->mca_lock);
1221                         break;
1222                 }
1223         }
1224         read_unlock_bh(&idev->lock);
1225
1226         return 0;
1227 }
1228
1229 /* called with rcu_read_lock() */
1230 int igmp6_event_report(struct sk_buff *skb)
1231 {
1232         struct ifmcaddr6 *ma;
1233         struct inet6_dev *idev;
1234         struct mld_msg *mld;
1235         int addr_type;
1236
1237         /* Our own report looped back. Ignore it. */
1238         if (skb->pkt_type == PACKET_LOOPBACK)
1239                 return 0;
1240
1241         /* send our report if the MC router may not have heard this report */
1242         if (skb->pkt_type != PACKET_MULTICAST &&
1243             skb->pkt_type != PACKET_BROADCAST)
1244                 return 0;
1245
1246         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1247                 return -EINVAL;
1248
1249         mld = (struct mld_msg *)icmp6_hdr(skb);
1250
1251         /* Drop reports with not link local source */
1252         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1253         if (addr_type != IPV6_ADDR_ANY &&
1254             !(addr_type&IPV6_ADDR_LINKLOCAL))
1255                 return -EINVAL;
1256
1257         idev = __in6_dev_get(skb->dev);
1258         if (idev == NULL)
1259                 return -ENODEV;
1260
1261         /*
1262          *      Cancel the timer for this group
1263          */
1264
1265         read_lock_bh(&idev->lock);
1266         for (ma = idev->mc_list; ma; ma=ma->next) {
1267                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1268                         spin_lock(&ma->mca_lock);
1269                         if (del_timer(&ma->mca_timer))
1270                                 atomic_dec(&ma->mca_refcnt);
1271                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1272                         spin_unlock(&ma->mca_lock);
1273                         break;
1274                 }
1275         }
1276         read_unlock_bh(&idev->lock);
1277         return 0;
1278 }
1279
1280 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1281         int gdeleted, int sdeleted)
1282 {
1283         switch (type) {
1284         case MLD2_MODE_IS_INCLUDE:
1285         case MLD2_MODE_IS_EXCLUDE:
1286                 if (gdeleted || sdeleted)
1287                         return 0;
1288                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1289                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1290                                 return 1;
1291                         /* don't include if this source is excluded
1292                          * in all filters
1293                          */
1294                         if (psf->sf_count[MCAST_INCLUDE])
1295                                 return type == MLD2_MODE_IS_INCLUDE;
1296                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1297                                 psf->sf_count[MCAST_EXCLUDE];
1298                 }
1299                 return 0;
1300         case MLD2_CHANGE_TO_INCLUDE:
1301                 if (gdeleted || sdeleted)
1302                         return 0;
1303                 return psf->sf_count[MCAST_INCLUDE] != 0;
1304         case MLD2_CHANGE_TO_EXCLUDE:
1305                 if (gdeleted || sdeleted)
1306                         return 0;
1307                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1308                     psf->sf_count[MCAST_INCLUDE])
1309                         return 0;
1310                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1311                         psf->sf_count[MCAST_EXCLUDE];
1312         case MLD2_ALLOW_NEW_SOURCES:
1313                 if (gdeleted || !psf->sf_crcount)
1314                         return 0;
1315                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1316         case MLD2_BLOCK_OLD_SOURCES:
1317                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1318                         return gdeleted || (psf->sf_crcount && sdeleted);
1319                 return psf->sf_crcount && !gdeleted && !sdeleted;
1320         }
1321         return 0;
1322 }
1323
1324 static int
1325 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1326 {
1327         struct ip6_sf_list *psf;
1328         int scount = 0;
1329
1330         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1331                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1332                         continue;
1333                 scount++;
1334         }
1335         return scount;
1336 }
1337
1338 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1339 {
1340         struct net *net = dev_net(dev);
1341         struct sock *sk = net->ipv6.igmp_sk;
1342         struct sk_buff *skb;
1343         struct mld2_report *pmr;
1344         struct in6_addr addr_buf;
1345         const struct in6_addr *saddr;
1346         int err;
1347         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1348                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1349                      IPV6_TLV_PADN, 0 };
1350
1351         /* we assume size > sizeof(ra) here */
1352         size += LL_ALLOCATED_SPACE(dev);
1353         /* limit our allocations to order-0 page */
1354         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1355         skb = sock_alloc_send_skb(sk, size, 1, &err);
1356
1357         if (!skb)
1358                 return NULL;
1359
1360         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1361
1362         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1363                 /* <draft-ietf-magma-mld-source-05.txt>:
1364                  * use unspecified address as the source address
1365                  * when a valid link-local address is not available.
1366                  */
1367                 saddr = &in6addr_any;
1368         } else
1369                 saddr = &addr_buf;
1370
1371         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1372
1373         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1374
1375         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1376         skb_put(skb, sizeof(*pmr));
1377         pmr = (struct mld2_report *)skb_transport_header(skb);
1378         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1379         pmr->mld2r_resv1 = 0;
1380         pmr->mld2r_cksum = 0;
1381         pmr->mld2r_resv2 = 0;
1382         pmr->mld2r_ngrec = 0;
1383         return skb;
1384 }
1385
1386 static void mld_sendpack(struct sk_buff *skb)
1387 {
1388         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1389         struct mld2_report *pmr =
1390                               (struct mld2_report *)skb_transport_header(skb);
1391         int payload_len, mldlen;
1392         struct inet6_dev *idev;
1393         struct net *net = dev_net(skb->dev);
1394         int err;
1395         struct flowi6 fl6;
1396         struct dst_entry *dst;
1397
1398         rcu_read_lock();
1399         idev = __in6_dev_get(skb->dev);
1400         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1401
1402         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1403         mldlen = skb->tail - skb->transport_header;
1404         pip6->payload_len = htons(payload_len);
1405
1406         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1407                                            IPPROTO_ICMPV6,
1408                                            csum_partial(skb_transport_header(skb),
1409                                                         mldlen, 0));
1410
1411         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1412
1413         if (!dst) {
1414                 err = -ENOMEM;
1415                 goto err_out;
1416         }
1417
1418         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1419                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1420                          skb->dev->ifindex);
1421
1422         dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1423         err = 0;
1424         if (IS_ERR(dst)) {
1425                 err = PTR_ERR(dst);
1426                 dst = NULL;
1427         }
1428         skb_dst_set(skb, dst);
1429         if (err)
1430                 goto err_out;
1431
1432         payload_len = skb->len;
1433
1434         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1435                       dst_output);
1436 out:
1437         if (!err) {
1438                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1439                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1440                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1441         } else
1442                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1443
1444         rcu_read_unlock();
1445         return;
1446
1447 err_out:
1448         kfree_skb(skb);
1449         goto out;
1450 }
1451
1452 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1453 {
1454         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1455 }
1456
1457 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1458         int type, struct mld2_grec **ppgr)
1459 {
1460         struct net_device *dev = pmc->idev->dev;
1461         struct mld2_report *pmr;
1462         struct mld2_grec *pgr;
1463
1464         if (!skb)
1465                 skb = mld_newpack(dev, dev->mtu);
1466         if (!skb)
1467                 return NULL;
1468         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1469         pgr->grec_type = type;
1470         pgr->grec_auxwords = 0;
1471         pgr->grec_nsrcs = 0;
1472         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1473         pmr = (struct mld2_report *)skb_transport_header(skb);
1474         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1475         *ppgr = pgr;
1476         return skb;
1477 }
1478
1479 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1480         skb_tailroom(skb)) : 0)
1481
1482 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1483         int type, int gdeleted, int sdeleted)
1484 {
1485         struct net_device *dev = pmc->idev->dev;
1486         struct mld2_report *pmr;
1487         struct mld2_grec *pgr = NULL;
1488         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1489         int scount, stotal, first, isquery, truncate;
1490
1491         if (pmc->mca_flags & MAF_NOREPORT)
1492                 return skb;
1493
1494         isquery = type == MLD2_MODE_IS_INCLUDE ||
1495                   type == MLD2_MODE_IS_EXCLUDE;
1496         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1497                     type == MLD2_CHANGE_TO_EXCLUDE;
1498
1499         stotal = scount = 0;
1500
1501         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1502
1503         if (!*psf_list)
1504                 goto empty_source;
1505
1506         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1507
1508         /* EX and TO_EX get a fresh packet, if needed */
1509         if (truncate) {
1510                 if (pmr && pmr->mld2r_ngrec &&
1511                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1512                         if (skb)
1513                                 mld_sendpack(skb);
1514                         skb = mld_newpack(dev, dev->mtu);
1515                 }
1516         }
1517         first = 1;
1518         psf_prev = NULL;
1519         for (psf=*psf_list; psf; psf=psf_next) {
1520                 struct in6_addr *psrc;
1521
1522                 psf_next = psf->sf_next;
1523
1524                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1525                         psf_prev = psf;
1526                         continue;
1527                 }
1528
1529                 /* clear marks on query responses */
1530                 if (isquery)
1531                         psf->sf_gsresp = 0;
1532
1533                 if (AVAILABLE(skb) < sizeof(*psrc) +
1534                     first*sizeof(struct mld2_grec)) {
1535                         if (truncate && !first)
1536                                 break;   /* truncate these */
1537                         if (pgr)
1538                                 pgr->grec_nsrcs = htons(scount);
1539                         if (skb)
1540                                 mld_sendpack(skb);
1541                         skb = mld_newpack(dev, dev->mtu);
1542                         first = 1;
1543                         scount = 0;
1544                 }
1545                 if (first) {
1546                         skb = add_grhead(skb, pmc, type, &pgr);
1547                         first = 0;
1548                 }
1549                 if (!skb)
1550                         return NULL;
1551                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1552                 *psrc = psf->sf_addr;
1553                 scount++; stotal++;
1554                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1555                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1556                         psf->sf_crcount--;
1557                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1558                                 if (psf_prev)
1559                                         psf_prev->sf_next = psf->sf_next;
1560                                 else
1561                                         *psf_list = psf->sf_next;
1562                                 kfree(psf);
1563                                 continue;
1564                         }
1565                 }
1566                 psf_prev = psf;
1567         }
1568
1569 empty_source:
1570         if (!stotal) {
1571                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1572                     type == MLD2_BLOCK_OLD_SOURCES)
1573                         return skb;
1574                 if (pmc->mca_crcount || isquery) {
1575                         /* make sure we have room for group header */
1576                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1577                                 mld_sendpack(skb);
1578                                 skb = NULL; /* add_grhead will get a new one */
1579                         }
1580                         skb = add_grhead(skb, pmc, type, &pgr);
1581                 }
1582         }
1583         if (pgr)
1584                 pgr->grec_nsrcs = htons(scount);
1585
1586         if (isquery)
1587                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1588         return skb;
1589 }
1590
1591 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1592 {
1593         struct sk_buff *skb = NULL;
1594         int type;
1595
1596         if (!pmc) {
1597                 read_lock_bh(&idev->lock);
1598                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1599                         if (pmc->mca_flags & MAF_NOREPORT)
1600                                 continue;
1601                         spin_lock_bh(&pmc->mca_lock);
1602                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1603                                 type = MLD2_MODE_IS_EXCLUDE;
1604                         else
1605                                 type = MLD2_MODE_IS_INCLUDE;
1606                         skb = add_grec(skb, pmc, type, 0, 0);
1607                         spin_unlock_bh(&pmc->mca_lock);
1608                 }
1609                 read_unlock_bh(&idev->lock);
1610         } else {
1611                 spin_lock_bh(&pmc->mca_lock);
1612                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1613                         type = MLD2_MODE_IS_EXCLUDE;
1614                 else
1615                         type = MLD2_MODE_IS_INCLUDE;
1616                 skb = add_grec(skb, pmc, type, 0, 0);
1617                 spin_unlock_bh(&pmc->mca_lock);
1618         }
1619         if (skb)
1620                 mld_sendpack(skb);
1621 }
1622
1623 /*
1624  * remove zero-count source records from a source filter list
1625  */
1626 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1627 {
1628         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1629
1630         psf_prev = NULL;
1631         for (psf=*ppsf; psf; psf = psf_next) {
1632                 psf_next = psf->sf_next;
1633                 if (psf->sf_crcount == 0) {
1634                         if (psf_prev)
1635                                 psf_prev->sf_next = psf->sf_next;
1636                         else
1637                                 *ppsf = psf->sf_next;
1638                         kfree(psf);
1639                 } else
1640                         psf_prev = psf;
1641         }
1642 }
1643
1644 static void mld_send_cr(struct inet6_dev *idev)
1645 {
1646         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1647         struct sk_buff *skb = NULL;
1648         int type, dtype;
1649
1650         read_lock_bh(&idev->lock);
1651         spin_lock(&idev->mc_lock);
1652
1653         /* deleted MCA's */
1654         pmc_prev = NULL;
1655         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1656                 pmc_next = pmc->next;
1657                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1658                         type = MLD2_BLOCK_OLD_SOURCES;
1659                         dtype = MLD2_BLOCK_OLD_SOURCES;
1660                         skb = add_grec(skb, pmc, type, 1, 0);
1661                         skb = add_grec(skb, pmc, dtype, 1, 1);
1662                 }
1663                 if (pmc->mca_crcount) {
1664                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1665                                 type = MLD2_CHANGE_TO_INCLUDE;
1666                                 skb = add_grec(skb, pmc, type, 1, 0);
1667                         }
1668                         pmc->mca_crcount--;
1669                         if (pmc->mca_crcount == 0) {
1670                                 mld_clear_zeros(&pmc->mca_tomb);
1671                                 mld_clear_zeros(&pmc->mca_sources);
1672                         }
1673                 }
1674                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1675                     !pmc->mca_sources) {
1676                         if (pmc_prev)
1677                                 pmc_prev->next = pmc_next;
1678                         else
1679                                 idev->mc_tomb = pmc_next;
1680                         in6_dev_put(pmc->idev);
1681                         kfree(pmc);
1682                 } else
1683                         pmc_prev = pmc;
1684         }
1685         spin_unlock(&idev->mc_lock);
1686
1687         /* change recs */
1688         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1689                 spin_lock_bh(&pmc->mca_lock);
1690                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1691                         type = MLD2_BLOCK_OLD_SOURCES;
1692                         dtype = MLD2_ALLOW_NEW_SOURCES;
1693                 } else {
1694                         type = MLD2_ALLOW_NEW_SOURCES;
1695                         dtype = MLD2_BLOCK_OLD_SOURCES;
1696                 }
1697                 skb = add_grec(skb, pmc, type, 0, 0);
1698                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1699
1700                 /* filter mode changes */
1701                 if (pmc->mca_crcount) {
1702                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1703                                 type = MLD2_CHANGE_TO_EXCLUDE;
1704                         else
1705                                 type = MLD2_CHANGE_TO_INCLUDE;
1706                         skb = add_grec(skb, pmc, type, 0, 0);
1707                         pmc->mca_crcount--;
1708                 }
1709                 spin_unlock_bh(&pmc->mca_lock);
1710         }
1711         read_unlock_bh(&idev->lock);
1712         if (!skb)
1713                 return;
1714         (void) mld_sendpack(skb);
1715 }
1716
1717 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1718 {
1719         struct net *net = dev_net(dev);
1720         struct sock *sk = net->ipv6.igmp_sk;
1721         struct inet6_dev *idev;
1722         struct sk_buff *skb;
1723         struct mld_msg *hdr;
1724         const struct in6_addr *snd_addr, *saddr;
1725         struct in6_addr addr_buf;
1726         int err, len, payload_len, full_len;
1727         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1728                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1729                      IPV6_TLV_PADN, 0 };
1730         struct flowi6 fl6;
1731         struct dst_entry *dst;
1732
1733         if (type == ICMPV6_MGM_REDUCTION)
1734                 snd_addr = &in6addr_linklocal_allrouters;
1735         else
1736                 snd_addr = addr;
1737
1738         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1739         payload_len = len + sizeof(ra);
1740         full_len = sizeof(struct ipv6hdr) + payload_len;
1741
1742         rcu_read_lock();
1743         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1744                       IPSTATS_MIB_OUT, full_len);
1745         rcu_read_unlock();
1746
1747         skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1748
1749         if (skb == NULL) {
1750                 rcu_read_lock();
1751                 IP6_INC_STATS(net, __in6_dev_get(dev),
1752                               IPSTATS_MIB_OUTDISCARDS);
1753                 rcu_read_unlock();
1754                 return;
1755         }
1756
1757         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1758
1759         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1760                 /* <draft-ietf-magma-mld-source-05.txt>:
1761                  * use unspecified address as the source address
1762                  * when a valid link-local address is not available.
1763                  */
1764                 saddr = &in6addr_any;
1765         } else
1766                 saddr = &addr_buf;
1767
1768         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1769
1770         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1771
1772         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1773         memset(hdr, 0, sizeof(struct mld_msg));
1774         hdr->mld_type = type;
1775         ipv6_addr_copy(&hdr->mld_mca, addr);
1776
1777         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1778                                          IPPROTO_ICMPV6,
1779                                          csum_partial(hdr, len, 0));
1780
1781         rcu_read_lock();
1782         idev = __in6_dev_get(skb->dev);
1783
1784         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1785         if (!dst) {
1786                 err = -ENOMEM;
1787                 goto err_out;
1788         }
1789
1790         icmpv6_flow_init(sk, &fl6, type,
1791                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1792                          skb->dev->ifindex);
1793
1794         dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1795         if (IS_ERR(dst)) {
1796                 err = PTR_ERR(dst);
1797                 goto err_out;
1798         }
1799
1800         skb_dst_set(skb, dst);
1801         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1802                       dst_output);
1803 out:
1804         if (!err) {
1805                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1806                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1807                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1808         } else
1809                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1810
1811         rcu_read_unlock();
1812         return;
1813
1814 err_out:
1815         kfree_skb(skb);
1816         goto out;
1817 }
1818
1819 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1820         const struct in6_addr *psfsrc)
1821 {
1822         struct ip6_sf_list *psf, *psf_prev;
1823         int rv = 0;
1824
1825         psf_prev = NULL;
1826         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1827                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1828                         break;
1829                 psf_prev = psf;
1830         }
1831         if (!psf || psf->sf_count[sfmode] == 0) {
1832                 /* source filter not found, or count wrong =>  bug */
1833                 return -ESRCH;
1834         }
1835         psf->sf_count[sfmode]--;
1836         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1837                 struct inet6_dev *idev = pmc->idev;
1838
1839                 /* no more filters for this source */
1840                 if (psf_prev)
1841                         psf_prev->sf_next = psf->sf_next;
1842                 else
1843                         pmc->mca_sources = psf->sf_next;
1844                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1845                     !MLD_V1_SEEN(idev)) {
1846                         psf->sf_crcount = idev->mc_qrv;
1847                         psf->sf_next = pmc->mca_tomb;
1848                         pmc->mca_tomb = psf;
1849                         rv = 1;
1850                 } else
1851                         kfree(psf);
1852         }
1853         return rv;
1854 }
1855
1856 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1857                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1858                           int delta)
1859 {
1860         struct ifmcaddr6 *pmc;
1861         int     changerec = 0;
1862         int     i, err;
1863
1864         if (!idev)
1865                 return -ENODEV;
1866         read_lock_bh(&idev->lock);
1867         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1868                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1869                         break;
1870         }
1871         if (!pmc) {
1872                 /* MCA not found?? bug */
1873                 read_unlock_bh(&idev->lock);
1874                 return -ESRCH;
1875         }
1876         spin_lock_bh(&pmc->mca_lock);
1877         sf_markstate(pmc);
1878         if (!delta) {
1879                 if (!pmc->mca_sfcount[sfmode]) {
1880                         spin_unlock_bh(&pmc->mca_lock);
1881                         read_unlock_bh(&idev->lock);
1882                         return -EINVAL;
1883                 }
1884                 pmc->mca_sfcount[sfmode]--;
1885         }
1886         err = 0;
1887         for (i=0; i<sfcount; i++) {
1888                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1889
1890                 changerec |= rv > 0;
1891                 if (!err && rv < 0)
1892                         err = rv;
1893         }
1894         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1895             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1896             pmc->mca_sfcount[MCAST_INCLUDE]) {
1897                 struct ip6_sf_list *psf;
1898
1899                 /* filter mode change */
1900                 pmc->mca_sfmode = MCAST_INCLUDE;
1901                 pmc->mca_crcount = idev->mc_qrv;
1902                 idev->mc_ifc_count = pmc->mca_crcount;
1903                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1904                         psf->sf_crcount = 0;
1905                 mld_ifc_event(pmc->idev);
1906         } else if (sf_setstate(pmc) || changerec)
1907                 mld_ifc_event(pmc->idev);
1908         spin_unlock_bh(&pmc->mca_lock);
1909         read_unlock_bh(&idev->lock);
1910         return err;
1911 }
1912
1913 /*
1914  * Add multicast single-source filter to the interface list
1915  */
1916 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1917         const struct in6_addr *psfsrc, int delta)
1918 {
1919         struct ip6_sf_list *psf, *psf_prev;
1920
1921         psf_prev = NULL;
1922         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1923                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1924                         break;
1925                 psf_prev = psf;
1926         }
1927         if (!psf) {
1928                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1929                 if (!psf)
1930                         return -ENOBUFS;
1931
1932                 psf->sf_addr = *psfsrc;
1933                 if (psf_prev) {
1934                         psf_prev->sf_next = psf;
1935                 } else
1936                         pmc->mca_sources = psf;
1937         }
1938         psf->sf_count[sfmode]++;
1939         return 0;
1940 }
1941
1942 static void sf_markstate(struct ifmcaddr6 *pmc)
1943 {
1944         struct ip6_sf_list *psf;
1945         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1946
1947         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1948                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1949                         psf->sf_oldin = mca_xcount ==
1950                                 psf->sf_count[MCAST_EXCLUDE] &&
1951                                 !psf->sf_count[MCAST_INCLUDE];
1952                 } else
1953                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1954 }
1955
1956 static int sf_setstate(struct ifmcaddr6 *pmc)
1957 {
1958         struct ip6_sf_list *psf, *dpsf;
1959         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1960         int qrv = pmc->idev->mc_qrv;
1961         int new_in, rv;
1962
1963         rv = 0;
1964         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1965                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1966                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1967                                 !psf->sf_count[MCAST_INCLUDE];
1968                 } else
1969                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1970                 if (new_in) {
1971                         if (!psf->sf_oldin) {
1972                                 struct ip6_sf_list *prev = NULL;
1973
1974                                 for (dpsf=pmc->mca_tomb; dpsf;
1975                                      dpsf=dpsf->sf_next) {
1976                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1977                                             &psf->sf_addr))
1978                                                 break;
1979                                         prev = dpsf;
1980                                 }
1981                                 if (dpsf) {
1982                                         if (prev)
1983                                                 prev->sf_next = dpsf->sf_next;
1984                                         else
1985                                                 pmc->mca_tomb = dpsf->sf_next;
1986                                         kfree(dpsf);
1987                                 }
1988                                 psf->sf_crcount = qrv;
1989                                 rv++;
1990                         }
1991                 } else if (psf->sf_oldin) {
1992                         psf->sf_crcount = 0;
1993                         /*
1994                          * add or update "delete" records if an active filter
1995                          * is now inactive
1996                          */
1997                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1998                                 if (ipv6_addr_equal(&dpsf->sf_addr,
1999                                     &psf->sf_addr))
2000                                         break;
2001                         if (!dpsf) {
2002                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2003                                 if (!dpsf)
2004                                         continue;
2005                                 *dpsf = *psf;
2006                                 /* pmc->mca_lock held by callers */
2007                                 dpsf->sf_next = pmc->mca_tomb;
2008                                 pmc->mca_tomb = dpsf;
2009                         }
2010                         dpsf->sf_crcount = qrv;
2011                         rv++;
2012                 }
2013         }
2014         return rv;
2015 }
2016
2017 /*
2018  * Add multicast source filter list to the interface list
2019  */
2020 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2021                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2022                           int delta)
2023 {
2024         struct ifmcaddr6 *pmc;
2025         int     isexclude;
2026         int     i, err;
2027
2028         if (!idev)
2029                 return -ENODEV;
2030         read_lock_bh(&idev->lock);
2031         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2032                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2033                         break;
2034         }
2035         if (!pmc) {
2036                 /* MCA not found?? bug */
2037                 read_unlock_bh(&idev->lock);
2038                 return -ESRCH;
2039         }
2040         spin_lock_bh(&pmc->mca_lock);
2041
2042         sf_markstate(pmc);
2043         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2044         if (!delta)
2045                 pmc->mca_sfcount[sfmode]++;
2046         err = 0;
2047         for (i=0; i<sfcount; i++) {
2048                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2049                 if (err)
2050                         break;
2051         }
2052         if (err) {
2053                 int j;
2054
2055                 if (!delta)
2056                         pmc->mca_sfcount[sfmode]--;
2057                 for (j=0; j<i; j++)
2058                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2059         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2060                 struct ip6_sf_list *psf;
2061
2062                 /* filter mode change */
2063                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2064                         pmc->mca_sfmode = MCAST_EXCLUDE;
2065                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2066                         pmc->mca_sfmode = MCAST_INCLUDE;
2067                 /* else no filters; keep old mode for reports */
2068
2069                 pmc->mca_crcount = idev->mc_qrv;
2070                 idev->mc_ifc_count = pmc->mca_crcount;
2071                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2072                         psf->sf_crcount = 0;
2073                 mld_ifc_event(idev);
2074         } else if (sf_setstate(pmc))
2075                 mld_ifc_event(idev);
2076         spin_unlock_bh(&pmc->mca_lock);
2077         read_unlock_bh(&idev->lock);
2078         return err;
2079 }
2080
2081 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2082 {
2083         struct ip6_sf_list *psf, *nextpsf;
2084
2085         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2086                 nextpsf = psf->sf_next;
2087                 kfree(psf);
2088         }
2089         pmc->mca_tomb = NULL;
2090         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2091                 nextpsf = psf->sf_next;
2092                 kfree(psf);
2093         }
2094         pmc->mca_sources = NULL;
2095         pmc->mca_sfmode = MCAST_EXCLUDE;
2096         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2097         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2098 }
2099
2100
2101 static void igmp6_join_group(struct ifmcaddr6 *ma)
2102 {
2103         unsigned long delay;
2104
2105         if (ma->mca_flags & MAF_NOREPORT)
2106                 return;
2107
2108         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2109
2110         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2111
2112         spin_lock_bh(&ma->mca_lock);
2113         if (del_timer(&ma->mca_timer)) {
2114                 atomic_dec(&ma->mca_refcnt);
2115                 delay = ma->mca_timer.expires - jiffies;
2116         }
2117
2118         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2119                 atomic_inc(&ma->mca_refcnt);
2120         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2121         spin_unlock_bh(&ma->mca_lock);
2122 }
2123
2124 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2125                             struct inet6_dev *idev)
2126 {
2127         int err;
2128
2129         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2130          * so no other readers or writers of iml or its sflist
2131          */
2132         if (!iml->sflist) {
2133                 /* any-source empty exclude case */
2134                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2135         }
2136         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2137                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2138         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2139         iml->sflist = NULL;
2140         return err;
2141 }
2142
2143 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2144 {
2145         if (MLD_V1_SEEN(ma->idev)) {
2146                 if (ma->mca_flags & MAF_LAST_REPORTER)
2147                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2148                                 ICMPV6_MGM_REDUCTION);
2149         } else {
2150                 mld_add_delrec(ma->idev, ma);
2151                 mld_ifc_event(ma->idev);
2152         }
2153 }
2154
2155 static void mld_gq_timer_expire(unsigned long data)
2156 {
2157         struct inet6_dev *idev = (struct inet6_dev *)data;
2158
2159         idev->mc_gq_running = 0;
2160         mld_send_report(idev, NULL);
2161         __in6_dev_put(idev);
2162 }
2163
2164 static void mld_ifc_timer_expire(unsigned long data)
2165 {
2166         struct inet6_dev *idev = (struct inet6_dev *)data;
2167
2168         mld_send_cr(idev);
2169         if (idev->mc_ifc_count) {
2170                 idev->mc_ifc_count--;
2171                 if (idev->mc_ifc_count)
2172                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2173         }
2174         __in6_dev_put(idev);
2175 }
2176
2177 static void mld_ifc_event(struct inet6_dev *idev)
2178 {
2179         if (MLD_V1_SEEN(idev))
2180                 return;
2181         idev->mc_ifc_count = idev->mc_qrv;
2182         mld_ifc_start_timer(idev, 1);
2183 }
2184
2185
2186 static void igmp6_timer_handler(unsigned long data)
2187 {
2188         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2189
2190         if (MLD_V1_SEEN(ma->idev))
2191                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2192         else
2193                 mld_send_report(ma->idev, ma);
2194
2195         spin_lock(&ma->mca_lock);
2196         ma->mca_flags |=  MAF_LAST_REPORTER;
2197         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2198         spin_unlock(&ma->mca_lock);
2199         ma_put(ma);
2200 }
2201
2202 /* Device changing type */
2203
2204 void ipv6_mc_unmap(struct inet6_dev *idev)
2205 {
2206         struct ifmcaddr6 *i;
2207
2208         /* Install multicast list, except for all-nodes (already installed) */
2209
2210         read_lock_bh(&idev->lock);
2211         for (i = idev->mc_list; i; i = i->next)
2212                 igmp6_group_dropped(i);
2213         read_unlock_bh(&idev->lock);
2214 }
2215
2216 void ipv6_mc_remap(struct inet6_dev *idev)
2217 {
2218         ipv6_mc_up(idev);
2219 }
2220
2221 /* Device going down */
2222
2223 void ipv6_mc_down(struct inet6_dev *idev)
2224 {
2225         struct ifmcaddr6 *i;
2226
2227         /* Withdraw multicast list */
2228
2229         read_lock_bh(&idev->lock);
2230         idev->mc_ifc_count = 0;
2231         if (del_timer(&idev->mc_ifc_timer))
2232                 __in6_dev_put(idev);
2233         idev->mc_gq_running = 0;
2234         if (del_timer(&idev->mc_gq_timer))
2235                 __in6_dev_put(idev);
2236
2237         for (i = idev->mc_list; i; i=i->next)
2238                 igmp6_group_dropped(i);
2239         read_unlock_bh(&idev->lock);
2240
2241         mld_clear_delrec(idev);
2242 }
2243
2244
2245 /* Device going up */
2246
2247 void ipv6_mc_up(struct inet6_dev *idev)
2248 {
2249         struct ifmcaddr6 *i;
2250
2251         /* Install multicast list, except for all-nodes (already installed) */
2252
2253         read_lock_bh(&idev->lock);
2254         for (i = idev->mc_list; i; i=i->next)
2255                 igmp6_group_added(i);
2256         read_unlock_bh(&idev->lock);
2257 }
2258
2259 /* IPv6 device initialization. */
2260
2261 void ipv6_mc_init_dev(struct inet6_dev *idev)
2262 {
2263         write_lock_bh(&idev->lock);
2264         spin_lock_init(&idev->mc_lock);
2265         idev->mc_gq_running = 0;
2266         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2267                         (unsigned long)idev);
2268         idev->mc_tomb = NULL;
2269         idev->mc_ifc_count = 0;
2270         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2271                         (unsigned long)idev);
2272         idev->mc_qrv = MLD_QRV_DEFAULT;
2273         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2274         idev->mc_v1_seen = 0;
2275         write_unlock_bh(&idev->lock);
2276 }
2277
2278 /*
2279  *      Device is about to be destroyed: clean up.
2280  */
2281
2282 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2283 {
2284         struct ifmcaddr6 *i;
2285
2286         /* Deactivate timers */
2287         ipv6_mc_down(idev);
2288
2289         /* Delete all-nodes address. */
2290         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2291          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2292          * fail.
2293          */
2294         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2295
2296         if (idev->cnf.forwarding)
2297                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2298
2299         write_lock_bh(&idev->lock);
2300         while ((i = idev->mc_list) != NULL) {
2301                 idev->mc_list = i->next;
2302                 write_unlock_bh(&idev->lock);
2303
2304                 igmp6_group_dropped(i);
2305                 ma_put(i);
2306
2307                 write_lock_bh(&idev->lock);
2308         }
2309         write_unlock_bh(&idev->lock);
2310 }
2311
2312 #ifdef CONFIG_PROC_FS
2313 struct igmp6_mc_iter_state {
2314         struct seq_net_private p;
2315         struct net_device *dev;
2316         struct inet6_dev *idev;
2317 };
2318
2319 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2320
2321 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2322 {
2323         struct ifmcaddr6 *im = NULL;
2324         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2325         struct net *net = seq_file_net(seq);
2326
2327         state->idev = NULL;
2328         for_each_netdev_rcu(net, state->dev) {
2329                 struct inet6_dev *idev;
2330                 idev = __in6_dev_get(state->dev);
2331                 if (!idev)
2332                         continue;
2333                 read_lock_bh(&idev->lock);
2334                 im = idev->mc_list;
2335                 if (im) {
2336                         state->idev = idev;
2337                         break;
2338                 }
2339                 read_unlock_bh(&idev->lock);
2340         }
2341         return im;
2342 }
2343
2344 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2345 {
2346         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2347
2348         im = im->next;
2349         while (!im) {
2350                 if (likely(state->idev != NULL))
2351                         read_unlock_bh(&state->idev->lock);
2352
2353                 state->dev = next_net_device_rcu(state->dev);
2354                 if (!state->dev) {
2355                         state->idev = NULL;
2356                         break;
2357                 }
2358                 state->idev = __in6_dev_get(state->dev);
2359                 if (!state->idev)
2360                         continue;
2361                 read_lock_bh(&state->idev->lock);
2362                 im = state->idev->mc_list;
2363         }
2364         return im;
2365 }
2366
2367 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2368 {
2369         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2370         if (im)
2371                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2372                         --pos;
2373         return pos ? NULL : im;
2374 }
2375
2376 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2377         __acquires(RCU)
2378 {
2379         rcu_read_lock();
2380         return igmp6_mc_get_idx(seq, *pos);
2381 }
2382
2383 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2384 {
2385         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2386
2387         ++*pos;
2388         return im;
2389 }
2390
2391 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2392         __releases(RCU)
2393 {
2394         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2395
2396         if (likely(state->idev != NULL)) {
2397                 read_unlock_bh(&state->idev->lock);
2398                 state->idev = NULL;
2399         }
2400         state->dev = NULL;
2401         rcu_read_unlock();
2402 }
2403
2404 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2405 {
2406         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2407         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2408
2409         seq_printf(seq,
2410                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2411                    state->dev->ifindex, state->dev->name,
2412                    &im->mca_addr,
2413                    im->mca_users, im->mca_flags,
2414                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2415                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2416         return 0;
2417 }
2418
2419 static const struct seq_operations igmp6_mc_seq_ops = {
2420         .start  =       igmp6_mc_seq_start,
2421         .next   =       igmp6_mc_seq_next,
2422         .stop   =       igmp6_mc_seq_stop,
2423         .show   =       igmp6_mc_seq_show,
2424 };
2425
2426 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2427 {
2428         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2429                             sizeof(struct igmp6_mc_iter_state));
2430 }
2431
2432 static const struct file_operations igmp6_mc_seq_fops = {
2433         .owner          =       THIS_MODULE,
2434         .open           =       igmp6_mc_seq_open,
2435         .read           =       seq_read,
2436         .llseek         =       seq_lseek,
2437         .release        =       seq_release_net,
2438 };
2439
2440 struct igmp6_mcf_iter_state {
2441         struct seq_net_private p;
2442         struct net_device *dev;
2443         struct inet6_dev *idev;
2444         struct ifmcaddr6 *im;
2445 };
2446
2447 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2448
2449 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2450 {
2451         struct ip6_sf_list *psf = NULL;
2452         struct ifmcaddr6 *im = NULL;
2453         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2454         struct net *net = seq_file_net(seq);
2455
2456         state->idev = NULL;
2457         state->im = NULL;
2458         for_each_netdev_rcu(net, state->dev) {
2459                 struct inet6_dev *idev;
2460                 idev = __in6_dev_get(state->dev);
2461                 if (unlikely(idev == NULL))
2462                         continue;
2463                 read_lock_bh(&idev->lock);
2464                 im = idev->mc_list;
2465                 if (likely(im != NULL)) {
2466                         spin_lock_bh(&im->mca_lock);
2467                         psf = im->mca_sources;
2468                         if (likely(psf != NULL)) {
2469                                 state->im = im;
2470                                 state->idev = idev;
2471                                 break;
2472                         }
2473                         spin_unlock_bh(&im->mca_lock);
2474                 }
2475                 read_unlock_bh(&idev->lock);
2476         }
2477         return psf;
2478 }
2479
2480 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2481 {
2482         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2483
2484         psf = psf->sf_next;
2485         while (!psf) {
2486                 spin_unlock_bh(&state->im->mca_lock);
2487                 state->im = state->im->next;
2488                 while (!state->im) {
2489                         if (likely(state->idev != NULL))
2490                                 read_unlock_bh(&state->idev->lock);
2491
2492                         state->dev = next_net_device_rcu(state->dev);
2493                         if (!state->dev) {
2494                                 state->idev = NULL;
2495                                 goto out;
2496                         }
2497                         state->idev = __in6_dev_get(state->dev);
2498                         if (!state->idev)
2499                                 continue;
2500                         read_lock_bh(&state->idev->lock);
2501                         state->im = state->idev->mc_list;
2502                 }
2503                 if (!state->im)
2504                         break;
2505                 spin_lock_bh(&state->im->mca_lock);
2506                 psf = state->im->mca_sources;
2507         }
2508 out:
2509         return psf;
2510 }
2511
2512 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2513 {
2514         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2515         if (psf)
2516                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2517                         --pos;
2518         return pos ? NULL : psf;
2519 }
2520
2521 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2522         __acquires(RCU)
2523 {
2524         rcu_read_lock();
2525         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2526 }
2527
2528 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2529 {
2530         struct ip6_sf_list *psf;
2531         if (v == SEQ_START_TOKEN)
2532                 psf = igmp6_mcf_get_first(seq);
2533         else
2534                 psf = igmp6_mcf_get_next(seq, v);
2535         ++*pos;
2536         return psf;
2537 }
2538
2539 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2540         __releases(RCU)
2541 {
2542         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2543         if (likely(state->im != NULL)) {
2544                 spin_unlock_bh(&state->im->mca_lock);
2545                 state->im = NULL;
2546         }
2547         if (likely(state->idev != NULL)) {
2548                 read_unlock_bh(&state->idev->lock);
2549                 state->idev = NULL;
2550         }
2551         state->dev = NULL;
2552         rcu_read_unlock();
2553 }
2554
2555 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2556 {
2557         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2558         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2559
2560         if (v == SEQ_START_TOKEN) {
2561                 seq_printf(seq,
2562                            "%3s %6s "
2563                            "%32s %32s %6s %6s\n", "Idx",
2564                            "Device", "Multicast Address",
2565                            "Source Address", "INC", "EXC");
2566         } else {
2567                 seq_printf(seq,
2568                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2569                            state->dev->ifindex, state->dev->name,
2570                            &state->im->mca_addr,
2571                            &psf->sf_addr,
2572                            psf->sf_count[MCAST_INCLUDE],
2573                            psf->sf_count[MCAST_EXCLUDE]);
2574         }
2575         return 0;
2576 }
2577
2578 static const struct seq_operations igmp6_mcf_seq_ops = {
2579         .start  =       igmp6_mcf_seq_start,
2580         .next   =       igmp6_mcf_seq_next,
2581         .stop   =       igmp6_mcf_seq_stop,
2582         .show   =       igmp6_mcf_seq_show,
2583 };
2584
2585 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2586 {
2587         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2588                             sizeof(struct igmp6_mcf_iter_state));
2589 }
2590
2591 static const struct file_operations igmp6_mcf_seq_fops = {
2592         .owner          =       THIS_MODULE,
2593         .open           =       igmp6_mcf_seq_open,
2594         .read           =       seq_read,
2595         .llseek         =       seq_lseek,
2596         .release        =       seq_release_net,
2597 };
2598
2599 static int __net_init igmp6_proc_init(struct net *net)
2600 {
2601         int err;
2602
2603         err = -ENOMEM;
2604         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2605                 goto out;
2606         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2607                                   &igmp6_mcf_seq_fops))
2608                 goto out_proc_net_igmp6;
2609
2610         err = 0;
2611 out:
2612         return err;
2613
2614 out_proc_net_igmp6:
2615         proc_net_remove(net, "igmp6");
2616         goto out;
2617 }
2618
2619 static void __net_exit igmp6_proc_exit(struct net *net)
2620 {
2621         proc_net_remove(net, "mcfilter6");
2622         proc_net_remove(net, "igmp6");
2623 }
2624 #else
2625 static inline int igmp6_proc_init(struct net *net)
2626 {
2627         return 0;
2628 }
2629 static inline void igmp6_proc_exit(struct net *net)
2630 {
2631 }
2632 #endif
2633
2634 static int __net_init igmp6_net_init(struct net *net)
2635 {
2636         int err;
2637
2638         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2639                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2640         if (err < 0) {
2641                 printk(KERN_ERR
2642                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2643                        err);
2644                 goto out;
2645         }
2646
2647         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2648
2649         err = igmp6_proc_init(net);
2650         if (err)
2651                 goto out_sock_create;
2652 out:
2653         return err;
2654
2655 out_sock_create:
2656         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2657         goto out;
2658 }
2659
2660 static void __net_exit igmp6_net_exit(struct net *net)
2661 {
2662         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2663         igmp6_proc_exit(net);
2664 }
2665
2666 static struct pernet_operations igmp6_net_ops = {
2667         .init = igmp6_net_init,
2668         .exit = igmp6_net_exit,
2669 };
2670
2671 int __init igmp6_init(void)
2672 {
2673         return register_pernet_subsys(&igmp6_net_ops);
2674 }
2675
2676 void igmp6_cleanup(void)
2677 {
2678         unregister_pernet_subsys(&igmp6_net_ops);
2679 }