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 <linux/pkt_sched.h>
  48 #include <net/mld.h>
  49
  50 #include <linux/netfilter.h>
  51 #include <linux/netfilter_ipv6.h>
  52
  53 #include <net/net_namespace.h>
  54 #include <net/sock.h>
  55 #include <net/snmp.h>
  56
  57 #include <net/ipv6.h>
  58 #include <net/protocol.h>
  59 #include <net/if_inet6.h>
  60 #include <net/ndisc.h>
  61 #include <net/addrconf.h>
  62 #include <net/ip6_route.h>
  63 #include <net/inet_common.h>
  64
  65 #include <net/ip6_checksum.h>
  66
  67 /* Set to 3 to get tracing... */
  68 #define MCAST_DEBUG 2
  69
  70 #if MCAST_DEBUG >= 3
  71 #define MDBG(x) printk x
  72 #else
  73 #define MDBG(x)
  74 #endif
  75
  76 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  77 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  80         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  81 };
  82
  83 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  84
  85 /* Big mc list lock for all the sockets */
  86 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  87
  88 static void igmp6_join_group(struct ifmcaddr6 *ma);
  89 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  90 static void igmp6_timer_handler(unsigned long data);
  91
  92 static void mld_gq_timer_expire(unsigned long data);
  93 static void mld_ifc_timer_expire(unsigned long data);
  94 static void mld_ifc_event(struct inet6_dev *idev);
  95 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  96 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  97 static void mld_clear_delrec(struct inet6_dev *idev);
  98 static bool mld_in_v1_mode(const struct inet6_dev *idev);
  99 static int sf_setstate(struct ifmcaddr6 *pmc);
 100 static void sf_markstate(struct ifmcaddr6 *pmc);
 101 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 102 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 103                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 104                           int delta);
 105 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 106                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 107                           int delta);
 108 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 109                             struct inet6_dev *idev);
 110
 111 #define MLD_QRV_DEFAULT         2
 112 /* RFC3810, 9.2. Query Interval */
 113 #define MLD_QI_DEFAULT          (125 * HZ)
 114 /* RFC3810, 9.3. Query Response Interval */
 115 #define MLD_QRI_DEFAULT         (10 * HZ)
 116
 117 /* RFC3810, 8.1 Query Version Distinctions */
 118 #define MLD_V1_QUERY_LEN        24
 119 #define MLD_V2_QUERY_LEN_MIN    28
 120
 121 #define IPV6_MLD_MAX_MSF        64
 122
 123 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 124
 125 /*
 126  *      socket join on multicast group
 127  */
 128
 129 #define for_each_pmc_rcu(np, pmc)                               \
 130         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 131              pmc != NULL;                                       \
 132              pmc = rcu_dereference(pmc->next))
 133
 134 static int unsolicited_report_interval(struct inet6_dev *idev)
 135 {
 136         int iv;
 137
 138         if (mld_in_v1_mode(idev))
 139                 iv = idev->cnf.mldv1_unsolicited_report_interval;
 140         else
 141                 iv = idev->cnf.mldv2_unsolicited_report_interval;
 142
 143         return iv > 0 ? iv : 1;
 144 }
 145
 146 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 147 {
 148         struct net_device *dev = NULL;
 149         struct ipv6_mc_socklist *mc_lst;
 150         struct ipv6_pinfo *np = inet6_sk(sk);
 151         struct net *net = sock_net(sk);
 152         int err;
 153
 154         if (!ipv6_addr_is_multicast(addr))
 155                 return -EINVAL;
 156
 157         rcu_read_lock();
 158         for_each_pmc_rcu(np, mc_lst) {
 159                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 160                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 161                         rcu_read_unlock();
 162                         return -EADDRINUSE;
 163                 }
 164         }
 165         rcu_read_unlock();
 166
 167         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 168
 169         if (mc_lst == NULL)
 170                 return -ENOMEM;
 171
 172         mc_lst->next = NULL;
 173         mc_lst->addr = *addr;
 174
 175         rcu_read_lock();
 176         if (ifindex == 0) {
 177                 struct rt6_info *rt;
 178                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 179                 if (rt) {
 180                         dev = rt->dst.dev;
 181                         ip6_rt_put(rt);
 182                 }
 183         } else
 184                 dev = dev_get_by_index_rcu(net, ifindex);
 185
 186         if (dev == NULL) {
 187                 rcu_read_unlock();
 188                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 189                 return -ENODEV;
 190         }
 191
 192         mc_lst->ifindex = dev->ifindex;
 193         mc_lst->sfmode = MCAST_EXCLUDE;
 194         rwlock_init(&mc_lst->sflock);
 195         mc_lst->sflist = NULL;
 196
 197         /*
 198          *      now add/increase the group membership on the device
 199          */
 200
 201         err = ipv6_dev_mc_inc(dev, addr);
 202
 203         if (err) {
 204                 rcu_read_unlock();
 205                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 206                 return err;
 207         }
 208
 209         spin_lock(&ipv6_sk_mc_lock);
 210         mc_lst->next = np->ipv6_mc_list;
 211         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 212         spin_unlock(&ipv6_sk_mc_lock);
 213
 214         rcu_read_unlock();
 215
 216         return 0;
 217 }
 218
 219 /*
 220  *      socket leave on multicast group
 221  */
 222 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 223 {
 224         struct ipv6_pinfo *np = inet6_sk(sk);
 225         struct ipv6_mc_socklist *mc_lst;
 226         struct ipv6_mc_socklist __rcu **lnk;
 227         struct net *net = sock_net(sk);
 228
 229         if (!ipv6_addr_is_multicast(addr))
 230                 return -EINVAL;
 231
 232         spin_lock(&ipv6_sk_mc_lock);
 233         for (lnk = &np->ipv6_mc_list;
 234              (mc_lst = rcu_dereference_protected(*lnk,
 235                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 236               lnk = &mc_lst->next) {
 237                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 238                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 239                         struct net_device *dev;
 240
 241                         *lnk = mc_lst->next;
 242                         spin_unlock(&ipv6_sk_mc_lock);
 243
 244                         rcu_read_lock();
 245                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 246                         if (dev != NULL) {
 247                                 struct inet6_dev *idev = __in6_dev_get(dev);
 248
 249                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 250                                 if (idev)
 251                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 252                         } else
 253                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 254                         rcu_read_unlock();
 255                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 256                         kfree_rcu(mc_lst, rcu);
 257                         return 0;
 258                 }
 259         }
 260         spin_unlock(&ipv6_sk_mc_lock);
 261
 262         return -EADDRNOTAVAIL;
 263 }
 264
 265 /* called with rcu_read_lock() */
 266 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 267                                              const struct in6_addr *group,
 268                                              int ifindex)
 269 {
 270         struct net_device *dev = NULL;
 271         struct inet6_dev *idev = NULL;
 272
 273         if (ifindex == 0) {
 274                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 275
 276                 if (rt) {
 277                         dev = rt->dst.dev;
 278                         ip6_rt_put(rt);
 279                 }
 280         } else
 281                 dev = dev_get_by_index_rcu(net, ifindex);
 282
 283         if (!dev)
 284                 return NULL;
 285         idev = __in6_dev_get(dev);
 286         if (!idev)
 287                 return NULL;
 288         read_lock_bh(&idev->lock);
 289         if (idev->dead) {
 290                 read_unlock_bh(&idev->lock);
 291                 return NULL;
 292         }
 293         return idev;
 294 }
 295
 296 void ipv6_sock_mc_close(struct sock *sk)
 297 {
 298         struct ipv6_pinfo *np = inet6_sk(sk);
 299         struct ipv6_mc_socklist *mc_lst;
 300         struct net *net = sock_net(sk);
 301
 302         if (!rcu_access_pointer(np->ipv6_mc_list))
 303                 return;
 304
 305         spin_lock(&ipv6_sk_mc_lock);
 306         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 307                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 308                 struct net_device *dev;
 309
 310                 np->ipv6_mc_list = mc_lst->next;
 311                 spin_unlock(&ipv6_sk_mc_lock);
 312
 313                 rcu_read_lock();
 314                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 315                 if (dev) {
 316                         struct inet6_dev *idev = __in6_dev_get(dev);
 317
 318                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 319                         if (idev)
 320                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 321                 } else
 322                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 323                 rcu_read_unlock();
 324
 325                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 326                 kfree_rcu(mc_lst, rcu);
 327
 328                 spin_lock(&ipv6_sk_mc_lock);
 329         }
 330         spin_unlock(&ipv6_sk_mc_lock);
 331 }
 332
 333 int ip6_mc_source(int add, int omode, struct sock *sk,
 334         struct group_source_req *pgsr)
 335 {
 336         struct in6_addr *source, *group;
 337         struct ipv6_mc_socklist *pmc;
 338         struct inet6_dev *idev;
 339         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 340         struct ip6_sf_socklist *psl;
 341         struct net *net = sock_net(sk);
 342         int i, j, rv;
 343         int leavegroup = 0;
 344         int pmclocked = 0;
 345         int err;
 346
 347         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 348         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 349
 350         if (!ipv6_addr_is_multicast(group))
 351                 return -EINVAL;
 352
 353         rcu_read_lock();
 354         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 355         if (!idev) {
 356                 rcu_read_unlock();
 357                 return -ENODEV;
 358         }
 359
 360         err = -EADDRNOTAVAIL;
 361
 362         for_each_pmc_rcu(inet6, pmc) {
 363                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 364                         continue;
 365                 if (ipv6_addr_equal(&pmc->addr, group))
 366                         break;
 367         }
 368         if (!pmc) {             /* must have a prior join */
 369                 err = -EINVAL;
 370                 goto done;
 371         }
 372         /* if a source filter was set, must be the same mode as before */
 373         if (pmc->sflist) {
 374                 if (pmc->sfmode != omode) {
 375                         err = -EINVAL;
 376                         goto done;
 377                 }
 378         } else if (pmc->sfmode != omode) {
 379                 /* allow mode switches for empty-set filters */
 380                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 381                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 382                 pmc->sfmode = omode;
 383         }
 384
 385         write_lock(&pmc->sflock);
 386         pmclocked = 1;
 387
 388         psl = pmc->sflist;
 389         if (!add) {
 390                 if (!psl)
 391                         goto done;      /* err = -EADDRNOTAVAIL */
 392                 rv = !0;
 393                 for (i=0; i<psl->sl_count; i++) {
 394                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 395                         if (rv == 0)
 396                                 break;
 397                 }
 398                 if (rv)         /* source not found */
 399                         goto done;      /* err = -EADDRNOTAVAIL */
 400
 401                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 402                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 403                         leavegroup = 1;
 404                         goto done;
 405                 }
 406
 407                 /* update the interface filter */
 408                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 409
 410                 for (j=i+1; j<psl->sl_count; j++)
 411                         psl->sl_addr[j-1] = psl->sl_addr[j];
 412                 psl->sl_count--;
 413                 err = 0;
 414                 goto done;
 415         }
 416         /* else, add a new source to the filter */
 417
 418         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 419                 err = -ENOBUFS;
 420                 goto done;
 421         }
 422         if (!psl || psl->sl_count == psl->sl_max) {
 423                 struct ip6_sf_socklist *newpsl;
 424                 int count = IP6_SFBLOCK;
 425
 426                 if (psl)
 427                         count += psl->sl_max;
 428                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 429                 if (!newpsl) {
 430                         err = -ENOBUFS;
 431                         goto done;
 432                 }
 433                 newpsl->sl_max = count;
 434                 newpsl->sl_count = count - IP6_SFBLOCK;
 435                 if (psl) {
 436                         for (i=0; i<psl->sl_count; i++)
 437                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 438                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 439                 }
 440                 pmc->sflist = psl = newpsl;
 441         }
 442         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 443         for (i=0; i<psl->sl_count; i++) {
 444                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 445                 if (rv == 0) /* There is an error in the address. */
 446                         goto done;
 447         }
 448         for (j=psl->sl_count-1; j>=i; j--)
 449                 psl->sl_addr[j+1] = psl->sl_addr[j];
 450         psl->sl_addr[i] = *source;
 451         psl->sl_count++;
 452         err = 0;
 453         /* update the interface list */
 454         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 455 done:
 456         if (pmclocked)
 457                 write_unlock(&pmc->sflock);
 458         read_unlock_bh(&idev->lock);
 459         rcu_read_unlock();
 460         if (leavegroup)
 461                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 462         return err;
 463 }
 464
 465 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 466 {
 467         const struct in6_addr *group;
 468         struct ipv6_mc_socklist *pmc;
 469         struct inet6_dev *idev;
 470         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 471         struct ip6_sf_socklist *newpsl, *psl;
 472         struct net *net = sock_net(sk);
 473         int leavegroup = 0;
 474         int i, err;
 475
 476         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 477
 478         if (!ipv6_addr_is_multicast(group))
 479                 return -EINVAL;
 480         if (gsf->gf_fmode != MCAST_INCLUDE &&
 481             gsf->gf_fmode != MCAST_EXCLUDE)
 482                 return -EINVAL;
 483
 484         rcu_read_lock();
 485         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 486
 487         if (!idev) {
 488                 rcu_read_unlock();
 489                 return -ENODEV;
 490         }
 491
 492         err = 0;
 493
 494         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 495                 leavegroup = 1;
 496                 goto done;
 497         }
 498
 499         for_each_pmc_rcu(inet6, pmc) {
 500                 if (pmc->ifindex != gsf->gf_interface)
 501                         continue;
 502                 if (ipv6_addr_equal(&pmc->addr, group))
 503                         break;
 504         }
 505         if (!pmc) {             /* must have a prior join */
 506                 err = -EINVAL;
 507                 goto done;
 508         }
 509         if (gsf->gf_numsrc) {
 510                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 511                                                           GFP_ATOMIC);
 512                 if (!newpsl) {
 513                         err = -ENOBUFS;
 514                         goto done;
 515                 }
 516                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 517                 for (i=0; i<newpsl->sl_count; ++i) {
 518                         struct sockaddr_in6 *psin6;
 519
 520                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 521                         newpsl->sl_addr[i] = psin6->sin6_addr;
 522                 }
 523                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 524                         newpsl->sl_count, newpsl->sl_addr, 0);
 525                 if (err) {
 526                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 527                         goto done;
 528                 }
 529         } else {
 530                 newpsl = NULL;
 531                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 532         }
 533
 534         write_lock(&pmc->sflock);
 535         psl = pmc->sflist;
 536         if (psl) {
 537                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 538                         psl->sl_count, psl->sl_addr, 0);
 539                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 540         } else
 541                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 542         pmc->sflist = newpsl;
 543         pmc->sfmode = gsf->gf_fmode;
 544         write_unlock(&pmc->sflock);
 545         err = 0;
 546 done:
 547         read_unlock_bh(&idev->lock);
 548         rcu_read_unlock();
 549         if (leavegroup)
 550                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 551         return err;
 552 }
 553
 554 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 555         struct group_filter __user *optval, int __user *optlen)
 556 {
 557         int err, i, count, copycount;
 558         const struct in6_addr *group;
 559         struct ipv6_mc_socklist *pmc;
 560         struct inet6_dev *idev;
 561         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 562         struct ip6_sf_socklist *psl;
 563         struct net *net = sock_net(sk);
 564
 565         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 566
 567         if (!ipv6_addr_is_multicast(group))
 568                 return -EINVAL;
 569
 570         rcu_read_lock();
 571         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 572
 573         if (!idev) {
 574                 rcu_read_unlock();
 575                 return -ENODEV;
 576         }
 577
 578         err = -EADDRNOTAVAIL;
 579         /*
 580          * changes to the ipv6_mc_list require the socket lock and
 581          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 582          * so reading the list is safe.
 583          */
 584
 585         for_each_pmc_rcu(inet6, pmc) {
 586                 if (pmc->ifindex != gsf->gf_interface)
 587                         continue;
 588                 if (ipv6_addr_equal(group, &pmc->addr))
 589                         break;
 590         }
 591         if (!pmc)               /* must have a prior join */
 592                 goto done;
 593         gsf->gf_fmode = pmc->sfmode;
 594         psl = pmc->sflist;
 595         count = psl ? psl->sl_count : 0;
 596         read_unlock_bh(&idev->lock);
 597         rcu_read_unlock();
 598
 599         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 600         gsf->gf_numsrc = count;
 601         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 602             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 603                 return -EFAULT;
 604         }
 605         /* changes to psl require the socket lock, a read lock on
 606          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 607          * have the socket lock, so reading here is safe.
 608          */
 609         for (i=0; i<copycount; i++) {
 610                 struct sockaddr_in6 *psin6;
 611                 struct sockaddr_storage ss;
 612
 613                 psin6 = (struct sockaddr_in6 *)&ss;
 614                 memset(&ss, 0, sizeof(ss));
 615                 psin6->sin6_family = AF_INET6;
 616                 psin6->sin6_addr = psl->sl_addr[i];
 617                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 618                         return -EFAULT;
 619         }
 620         return 0;
 621 done:
 622         read_unlock_bh(&idev->lock);
 623         rcu_read_unlock();
 624         return err;
 625 }
 626
 627 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 628                     const struct in6_addr *src_addr)
 629 {
 630         struct ipv6_pinfo *np = inet6_sk(sk);
 631         struct ipv6_mc_socklist *mc;
 632         struct ip6_sf_socklist *psl;
 633         bool rv = true;
 634
 635         rcu_read_lock();
 636         for_each_pmc_rcu(np, mc) {
 637                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 638                         break;
 639         }
 640         if (!mc) {
 641                 rcu_read_unlock();
 642                 return true;
 643         }
 644         read_lock(&mc->sflock);
 645         psl = mc->sflist;
 646         if (!psl) {
 647                 rv = mc->sfmode == MCAST_EXCLUDE;
 648         } else {
 649                 int i;
 650
 651                 for (i=0; i<psl->sl_count; i++) {
 652                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 653                                 break;
 654                 }
 655                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 656                         rv = false;
 657                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 658                         rv = false;
 659         }
 660         read_unlock(&mc->sflock);
 661         rcu_read_unlock();
 662
 663         return rv;
 664 }
 665
 666 static void ma_put(struct ifmcaddr6 *mc)
 667 {
 668         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 669                 in6_dev_put(mc->idev);
 670                 kfree(mc);
 671         }
 672 }
 673
 674 static void igmp6_group_added(struct ifmcaddr6 *mc)
 675 {
 676         struct net_device *dev = mc->idev->dev;
 677         char buf[MAX_ADDR_LEN];
 678
 679         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 680             IPV6_ADDR_SCOPE_LINKLOCAL)
 681                 return;
 682
 683         spin_lock_bh(&mc->mca_lock);
 684         if (!(mc->mca_flags&MAF_LOADED)) {
 685                 mc->mca_flags |= MAF_LOADED;
 686                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 687                         dev_mc_add(dev, buf);
 688         }
 689         spin_unlock_bh(&mc->mca_lock);
 690
 691         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 692                 return;
 693
 694         if (mld_in_v1_mode(mc->idev)) {
 695                 igmp6_join_group(mc);
 696                 return;
 697         }
 698         /* else v2 */
 699
 700         mc->mca_crcount = mc->idev->mc_qrv;
 701         mld_ifc_event(mc->idev);
 702 }
 703
 704 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 705 {
 706         struct net_device *dev = mc->idev->dev;
 707         char buf[MAX_ADDR_LEN];
 708
 709         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 710             IPV6_ADDR_SCOPE_LINKLOCAL)
 711                 return;
 712
 713         spin_lock_bh(&mc->mca_lock);
 714         if (mc->mca_flags&MAF_LOADED) {
 715                 mc->mca_flags &= ~MAF_LOADED;
 716                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 717                         dev_mc_del(dev, buf);
 718         }
 719
 720         if (mc->mca_flags & MAF_NOREPORT)
 721                 goto done;
 722         spin_unlock_bh(&mc->mca_lock);
 723
 724         if (!mc->idev->dead)
 725                 igmp6_leave_group(mc);
 726
 727         spin_lock_bh(&mc->mca_lock);
 728         if (del_timer(&mc->mca_timer))
 729                 atomic_dec(&mc->mca_refcnt);
 730 done:
 731         ip6_mc_clear_src(mc);
 732         spin_unlock_bh(&mc->mca_lock);
 733 }
 734
 735 /*
 736  * deleted ifmcaddr6 manipulation
 737  */
 738 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 739 {
 740         struct ifmcaddr6 *pmc;
 741
 742         /* this is an "ifmcaddr6" for convenience; only the fields below
 743          * are actually used. In particular, the refcnt and users are not
 744          * used for management of the delete list. Using the same structure
 745          * for deleted items allows change reports to use common code with
 746          * non-deleted or query-response MCA's.
 747          */
 748         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 749         if (!pmc)
 750                 return;
 751
 752         spin_lock_bh(&im->mca_lock);
 753         spin_lock_init(&pmc->mca_lock);
 754         pmc->idev = im->idev;
 755         in6_dev_hold(idev);
 756         pmc->mca_addr = im->mca_addr;
 757         pmc->mca_crcount = idev->mc_qrv;
 758         pmc->mca_sfmode = im->mca_sfmode;
 759         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 760                 struct ip6_sf_list *psf;
 761
 762                 pmc->mca_tomb = im->mca_tomb;
 763                 pmc->mca_sources = im->mca_sources;
 764                 im->mca_tomb = im->mca_sources = NULL;
 765                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 766                         psf->sf_crcount = pmc->mca_crcount;
 767         }
 768         spin_unlock_bh(&im->mca_lock);
 769
 770         spin_lock_bh(&idev->mc_lock);
 771         pmc->next = idev->mc_tomb;
 772         idev->mc_tomb = pmc;
 773         spin_unlock_bh(&idev->mc_lock);
 774 }
 775
 776 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 777 {
 778         struct ifmcaddr6 *pmc, *pmc_prev;
 779         struct ip6_sf_list *psf, *psf_next;
 780
 781         spin_lock_bh(&idev->mc_lock);
 782         pmc_prev = NULL;
 783         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 784                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 785                         break;
 786                 pmc_prev = pmc;
 787         }
 788         if (pmc) {
 789                 if (pmc_prev)
 790                         pmc_prev->next = pmc->next;
 791                 else
 792                         idev->mc_tomb = pmc->next;
 793         }
 794         spin_unlock_bh(&idev->mc_lock);
 795
 796         if (pmc) {
 797                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 798                         psf_next = psf->sf_next;
 799                         kfree(psf);
 800                 }
 801                 in6_dev_put(pmc->idev);
 802                 kfree(pmc);
 803         }
 804 }
 805
 806 static void mld_clear_delrec(struct inet6_dev *idev)
 807 {
 808         struct ifmcaddr6 *pmc, *nextpmc;
 809
 810         spin_lock_bh(&idev->mc_lock);
 811         pmc = idev->mc_tomb;
 812         idev->mc_tomb = NULL;
 813         spin_unlock_bh(&idev->mc_lock);
 814
 815         for (; pmc; pmc = nextpmc) {
 816                 nextpmc = pmc->next;
 817                 ip6_mc_clear_src(pmc);
 818                 in6_dev_put(pmc->idev);
 819                 kfree(pmc);
 820         }
 821
 822         /* clear dead sources, too */
 823         read_lock_bh(&idev->lock);
 824         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 825                 struct ip6_sf_list *psf, *psf_next;
 826
 827                 spin_lock_bh(&pmc->mca_lock);
 828                 psf = pmc->mca_tomb;
 829                 pmc->mca_tomb = NULL;
 830                 spin_unlock_bh(&pmc->mca_lock);
 831                 for (; psf; psf=psf_next) {
 832                         psf_next = psf->sf_next;
 833                         kfree(psf);
 834                 }
 835         }
 836         read_unlock_bh(&idev->lock);
 837 }
 838
 839
 840 /*
 841  *      device multicast group inc (add if not found)
 842  */
 843 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 844 {
 845         struct ifmcaddr6 *mc;
 846         struct inet6_dev *idev;
 847
 848         /* we need to take a reference on idev */
 849         idev = in6_dev_get(dev);
 850
 851         if (idev == NULL)
 852                 return -EINVAL;
 853
 854         write_lock_bh(&idev->lock);
 855         if (idev->dead) {
 856                 write_unlock_bh(&idev->lock);
 857                 in6_dev_put(idev);
 858                 return -ENODEV;
 859         }
 860
 861         for (mc = idev->mc_list; mc; mc = mc->next) {
 862                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 863                         mc->mca_users++;
 864                         write_unlock_bh(&idev->lock);
 865                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 866                                 NULL, 0);
 867                         in6_dev_put(idev);
 868                         return 0;
 869                 }
 870         }
 871
 872         /*
 873          *      not found: create a new one.
 874          */
 875
 876         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 877
 878         if (mc == NULL) {
 879                 write_unlock_bh(&idev->lock);
 880                 in6_dev_put(idev);
 881                 return -ENOMEM;
 882         }
 883
 884         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 885
 886         mc->mca_addr = *addr;
 887         mc->idev = idev; /* (reference taken) */
 888         mc->mca_users = 1;
 889         /* mca_stamp should be updated upon changes */
 890         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 891         atomic_set(&mc->mca_refcnt, 2);
 892         spin_lock_init(&mc->mca_lock);
 893
 894         /* initial mode is (EX, empty) */
 895         mc->mca_sfmode = MCAST_EXCLUDE;
 896         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 897
 898         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 899             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 900                 mc->mca_flags |= MAF_NOREPORT;
 901
 902         mc->next = idev->mc_list;
 903         idev->mc_list = mc;
 904         write_unlock_bh(&idev->lock);
 905
 906         mld_del_delrec(idev, &mc->mca_addr);
 907         igmp6_group_added(mc);
 908         ma_put(mc);
 909         return 0;
 910 }
 911
 912 /*
 913  *      device multicast group del
 914  */
 915 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 916 {
 917         struct ifmcaddr6 *ma, **map;
 918
 919         write_lock_bh(&idev->lock);
 920         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 921                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 922                         if (--ma->mca_users == 0) {
 923                                 *map = ma->next;
 924                                 write_unlock_bh(&idev->lock);
 925
 926                                 igmp6_group_dropped(ma);
 927
 928                                 ma_put(ma);
 929                                 return 0;
 930                         }
 931                         write_unlock_bh(&idev->lock);
 932                         return 0;
 933                 }
 934         }
 935         write_unlock_bh(&idev->lock);
 936
 937         return -ENOENT;
 938 }
 939
 940 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 941 {
 942         struct inet6_dev *idev;
 943         int err;
 944
 945         rcu_read_lock();
 946
 947         idev = __in6_dev_get(dev);
 948         if (!idev)
 949                 err = -ENODEV;
 950         else
 951                 err = __ipv6_dev_mc_dec(idev, addr);
 952
 953         rcu_read_unlock();
 954         return err;
 955 }
 956
 957 /*
 958  *      check if the interface/address pair is valid
 959  */
 960 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 961                          const struct in6_addr *src_addr)
 962 {
 963         struct inet6_dev *idev;
 964         struct ifmcaddr6 *mc;
 965         bool rv = false;
 966
 967         rcu_read_lock();
 968         idev = __in6_dev_get(dev);
 969         if (idev) {
 970                 read_lock_bh(&idev->lock);
 971                 for (mc = idev->mc_list; mc; mc=mc->next) {
 972                         if (ipv6_addr_equal(&mc->mca_addr, group))
 973                                 break;
 974                 }
 975                 if (mc) {
 976                         if (src_addr && !ipv6_addr_any(src_addr)) {
 977                                 struct ip6_sf_list *psf;
 978
 979                                 spin_lock_bh(&mc->mca_lock);
 980                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 981                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 982                                                 break;
 983                                 }
 984                                 if (psf)
 985                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 986                                                 psf->sf_count[MCAST_EXCLUDE] !=
 987                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 988                                 else
 989                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 990                                 spin_unlock_bh(&mc->mca_lock);
 991                         } else
 992                                 rv = true; /* don't filter unspecified source */
 993                 }
 994                 read_unlock_bh(&idev->lock);
 995         }
 996         rcu_read_unlock();
 997         return rv;
 998 }
 999
1000 static void mld_gq_start_timer(struct inet6_dev *idev)
1001 {
1002         unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1003
1004         idev->mc_gq_running = 1;
1005         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1006                 in6_dev_hold(idev);
1007 }
1008
1009 static void mld_gq_stop_timer(struct inet6_dev *idev)
1010 {
1011         idev->mc_gq_running = 0;
1012         if (del_timer(&idev->mc_gq_timer))
1013                 __in6_dev_put(idev);
1014 }
1015
1016 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1017 {
1018         unsigned long tv = prandom_u32() % delay;
1019
1020         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1021                 in6_dev_hold(idev);
1022 }
1023
1024 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1025 {
1026         idev->mc_ifc_count = 0;
1027         if (del_timer(&idev->mc_ifc_timer))
1028                 __in6_dev_put(idev);
1029 }
1030
1031 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1032 {
1033         unsigned long tv = prandom_u32() % delay;
1034
1035         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1036                 in6_dev_hold(idev);
1037 }
1038
1039 static void mld_dad_stop_timer(struct inet6_dev *idev)
1040 {
1041         if (del_timer(&idev->mc_dad_timer))
1042                 __in6_dev_put(idev);
1043 }
1044
1045 /*
1046  *      IGMP handling (alias multicast ICMPv6 messages)
1047  */
1048
1049 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1050 {
1051         unsigned long delay = resptime;
1052
1053         /* Do not start timer for these addresses */
1054         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1055             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1056                 return;
1057
1058         if (del_timer(&ma->mca_timer)) {
1059                 atomic_dec(&ma->mca_refcnt);
1060                 delay = ma->mca_timer.expires - jiffies;
1061         }
1062
1063         if (delay >= resptime)
1064                 delay = prandom_u32() % resptime;
1065
1066         ma->mca_timer.expires = jiffies + delay;
1067         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1068                 atomic_inc(&ma->mca_refcnt);
1069         ma->mca_flags |= MAF_TIMER_RUNNING;
1070 }
1071
1072 /* mark EXCLUDE-mode sources */
1073 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1074                              const struct in6_addr *srcs)
1075 {
1076         struct ip6_sf_list *psf;
1077         int i, scount;
1078
1079         scount = 0;
1080         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1081                 if (scount == nsrcs)
1082                         break;
1083                 for (i=0; i<nsrcs; i++) {
1084                         /* skip inactive filters */
1085                         if (psf->sf_count[MCAST_INCLUDE] ||
1086                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1087                             psf->sf_count[MCAST_EXCLUDE])
1088                                 break;
1089                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1090                                 scount++;
1091                                 break;
1092                         }
1093                 }
1094         }
1095         pmc->mca_flags &= ~MAF_GSQUERY;
1096         if (scount == nsrcs)    /* all sources excluded */
1097                 return false;
1098         return true;
1099 }
1100
1101 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1102                             const struct in6_addr *srcs)
1103 {
1104         struct ip6_sf_list *psf;
1105         int i, scount;
1106
1107         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1108                 return mld_xmarksources(pmc, nsrcs, srcs);
1109
1110         /* mark INCLUDE-mode sources */
1111
1112         scount = 0;
1113         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1114                 if (scount == nsrcs)
1115                         break;
1116                 for (i=0; i<nsrcs; i++) {
1117                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1118                                 psf->sf_gsresp = 1;
1119                                 scount++;
1120                                 break;
1121                         }
1122                 }
1123         }
1124         if (!scount) {
1125                 pmc->mca_flags &= ~MAF_GSQUERY;
1126                 return false;
1127         }
1128         pmc->mca_flags |= MAF_GSQUERY;
1129         return true;
1130 }
1131
1132 static int mld_force_mld_version(const struct inet6_dev *idev)
1133 {
1134         /* Normally, both are 0 here. If enforcement to a particular is
1135          * being used, individual device enforcement will have a lower
1136          * precedence over 'all' device (.../conf/all/force_mld_version).
1137          */
1138
1139         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1140                 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1141         else
1142                 return idev->cnf.force_mld_version;
1143 }
1144
1145 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1146 {
1147         return mld_force_mld_version(idev) == 2;
1148 }
1149
1150 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1151 {
1152         return mld_force_mld_version(idev) == 1;
1153 }
1154
1155 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1156 {
1157         if (mld_in_v2_mode_only(idev))
1158                 return false;
1159         if (mld_in_v1_mode_only(idev))
1160                 return true;
1161         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1162                 return true;
1163
1164         return false;
1165 }
1166
1167 static void mld_set_v1_mode(struct inet6_dev *idev)
1168 {
1169         /* RFC3810, relevant sections:
1170          *  - 9.1. Robustness Variable
1171          *  - 9.2. Query Interval
1172          *  - 9.3. Query Response Interval
1173          *  - 9.12. Older Version Querier Present Timeout
1174          */
1175         unsigned long switchback;
1176
1177         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1178
1179         idev->mc_v1_seen = jiffies + switchback;
1180 }
1181
1182 static void mld_update_qrv(struct inet6_dev *idev,
1183                            const struct mld2_query *mlh2)
1184 {
1185         /* RFC3810, relevant sections:
1186          *  - 5.1.8. QRV (Querier's Robustness Variable)
1187          *  - 9.1. Robustness Variable
1188          */
1189
1190         /* The value of the Robustness Variable MUST NOT be zero,
1191          * and SHOULD NOT be one. Catch this here if we ever run
1192          * into such a case in future.
1193          */
1194         WARN_ON(idev->mc_qrv == 0);
1195
1196         if (mlh2->mld2q_qrv > 0)
1197                 idev->mc_qrv = mlh2->mld2q_qrv;
1198
1199         if (unlikely(idev->mc_qrv < 2)) {
1200                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1201                                      idev->mc_qrv, MLD_QRV_DEFAULT);
1202                 idev->mc_qrv = MLD_QRV_DEFAULT;
1203         }
1204 }
1205
1206 static void mld_update_qi(struct inet6_dev *idev,
1207                           const struct mld2_query *mlh2)
1208 {
1209         /* RFC3810, relevant sections:
1210          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1211          *  - 9.2. Query Interval
1212          *  - 9.12. Older Version Querier Present Timeout
1213          *    (the [Query Interval] in the last Query received)
1214          */
1215         unsigned long mc_qqi;
1216
1217         if (mlh2->mld2q_qqic < 128) {
1218                 mc_qqi = mlh2->mld2q_qqic;
1219         } else {
1220                 unsigned long mc_man, mc_exp;
1221
1222                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1223                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1224
1225                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1226         }
1227
1228         idev->mc_qi = mc_qqi * HZ;
1229 }
1230
1231 static void mld_update_qri(struct inet6_dev *idev,
1232                            const struct mld2_query *mlh2)
1233 {
1234         /* RFC3810, relevant sections:
1235          *  - 5.1.3. Maximum Response Code
1236          *  - 9.3. Query Response Interval
1237          */
1238         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1239 }
1240
1241 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1242                           unsigned long *max_delay)
1243 {
1244         unsigned long mldv1_md;
1245
1246         /* Ignore v1 queries */
1247         if (mld_in_v2_mode_only(idev))
1248                 return -EINVAL;
1249
1250         /* MLDv1 router present */
1251         mldv1_md = ntohs(mld->mld_maxdelay);
1252         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1253
1254         mld_set_v1_mode(idev);
1255
1256         /* cancel MLDv2 report timer */
1257         mld_gq_stop_timer(idev);
1258         /* cancel the interface change timer */
1259         mld_ifc_stop_timer(idev);
1260         /* clear deleted report items */
1261         mld_clear_delrec(idev);
1262
1263         return 0;
1264 }
1265
1266 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1267                           unsigned long *max_delay)
1268 {
1269         /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
1270         if (mld_in_v1_mode(idev))
1271                 return -EINVAL;
1272
1273         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1274
1275         mld_update_qrv(idev, mld);
1276         mld_update_qi(idev, mld);
1277         mld_update_qri(idev, mld);
1278
1279         idev->mc_maxdelay = *max_delay;
1280
1281         return 0;
1282 }
1283
1284 /* called with rcu_read_lock() */
1285 int igmp6_event_query(struct sk_buff *skb)
1286 {
1287         struct mld2_query *mlh2 = NULL;
1288         struct ifmcaddr6 *ma;
1289         const struct in6_addr *group;
1290         unsigned long max_delay;
1291         struct inet6_dev *idev;
1292         struct mld_msg *mld;
1293         int group_type;
1294         int mark = 0;
1295         int len, err;
1296
1297         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1298                 return -EINVAL;
1299
1300         /* compute payload length excluding extension headers */
1301         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1302         len -= skb_network_header_len(skb);
1303
1304         /* RFC3810 6.2
1305          * Upon reception of an MLD message that contains a Query, the node
1306          * checks if the source address of the message is a valid link-local
1307          * address, if the Hop Limit is set to 1, and if the Router Alert
1308          * option is present in the Hop-By-Hop Options header of the IPv6
1309          * packet.  If any of these checks fails, the packet is dropped.
1310          */
1311         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1312             ipv6_hdr(skb)->hop_limit != 1 ||
1313             !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1314             IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1315                 return -EINVAL;
1316
1317         idev = __in6_dev_get(skb->dev);
1318         if (idev == NULL)
1319                 return 0;
1320
1321         mld = (struct mld_msg *)icmp6_hdr(skb);
1322         group = &mld->mld_mca;
1323         group_type = ipv6_addr_type(group);
1324
1325         if (group_type != IPV6_ADDR_ANY &&
1326             !(group_type&IPV6_ADDR_MULTICAST))
1327                 return -EINVAL;
1328
1329         if (len == MLD_V1_QUERY_LEN) {
1330                 err = mld_process_v1(idev, mld, &max_delay);
1331                 if (err < 0)
1332                         return err;
1333         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1334                 int srcs_offset = sizeof(struct mld2_query) -
1335                                   sizeof(struct icmp6hdr);
1336
1337                 if (!pskb_may_pull(skb, srcs_offset))
1338                         return -EINVAL;
1339
1340                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1341
1342                 err = mld_process_v2(idev, mlh2, &max_delay);
1343                 if (err < 0)
1344                         return err;
1345
1346                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1347                         if (mlh2->mld2q_nsrcs)
1348                                 return -EINVAL; /* no sources allowed */
1349
1350                         mld_gq_start_timer(idev);
1351                         return 0;
1352                 }
1353                 /* mark sources to include, if group & source-specific */
1354                 if (mlh2->mld2q_nsrcs != 0) {
1355                         if (!pskb_may_pull(skb, srcs_offset +
1356                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1357                                 return -EINVAL;
1358
1359                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1360                         mark = 1;
1361                 }
1362         } else
1363                 return -EINVAL;
1364
1365         read_lock_bh(&idev->lock);
1366         if (group_type == IPV6_ADDR_ANY) {
1367                 for (ma = idev->mc_list; ma; ma=ma->next) {
1368                         spin_lock_bh(&ma->mca_lock);
1369                         igmp6_group_queried(ma, max_delay);
1370                         spin_unlock_bh(&ma->mca_lock);
1371                 }
1372         } else {
1373                 for (ma = idev->mc_list; ma; ma=ma->next) {
1374                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1375                                 continue;
1376                         spin_lock_bh(&ma->mca_lock);
1377                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1378                                 /* gsquery <- gsquery && mark */
1379                                 if (!mark)
1380                                         ma->mca_flags &= ~MAF_GSQUERY;
1381                         } else {
1382                                 /* gsquery <- mark */
1383                                 if (mark)
1384                                         ma->mca_flags |= MAF_GSQUERY;
1385                                 else
1386                                         ma->mca_flags &= ~MAF_GSQUERY;
1387                         }
1388                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1389                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1390                                 igmp6_group_queried(ma, max_delay);
1391                         spin_unlock_bh(&ma->mca_lock);
1392                         break;
1393                 }
1394         }
1395         read_unlock_bh(&idev->lock);
1396
1397         return 0;
1398 }
1399
1400 /* called with rcu_read_lock() */
1401 int igmp6_event_report(struct sk_buff *skb)
1402 {
1403         struct ifmcaddr6 *ma;
1404         struct inet6_dev *idev;
1405         struct mld_msg *mld;
1406         int addr_type;
1407
1408         /* Our own report looped back. Ignore it. */
1409         if (skb->pkt_type == PACKET_LOOPBACK)
1410                 return 0;
1411
1412         /* send our report if the MC router may not have heard this report */
1413         if (skb->pkt_type != PACKET_MULTICAST &&
1414             skb->pkt_type != PACKET_BROADCAST)
1415                 return 0;
1416
1417         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1418                 return -EINVAL;
1419
1420         mld = (struct mld_msg *)icmp6_hdr(skb);
1421
1422         /* Drop reports with not link local source */
1423         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1424         if (addr_type != IPV6_ADDR_ANY &&
1425             !(addr_type&IPV6_ADDR_LINKLOCAL))
1426                 return -EINVAL;
1427
1428         idev = __in6_dev_get(skb->dev);
1429         if (idev == NULL)
1430                 return -ENODEV;
1431
1432         /*
1433          *      Cancel the timer for this group
1434          */
1435
1436         read_lock_bh(&idev->lock);
1437         for (ma = idev->mc_list; ma; ma=ma->next) {
1438                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1439                         spin_lock(&ma->mca_lock);
1440                         if (del_timer(&ma->mca_timer))
1441                                 atomic_dec(&ma->mca_refcnt);
1442                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1443                         spin_unlock(&ma->mca_lock);
1444                         break;
1445                 }
1446         }
1447         read_unlock_bh(&idev->lock);
1448         return 0;
1449 }
1450
1451 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1452                   int gdeleted, int sdeleted)
1453 {
1454         switch (type) {
1455         case MLD2_MODE_IS_INCLUDE:
1456         case MLD2_MODE_IS_EXCLUDE:
1457                 if (gdeleted || sdeleted)
1458                         return false;
1459                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1460                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1461                                 return true;
1462                         /* don't include if this source is excluded
1463                          * in all filters
1464                          */
1465                         if (psf->sf_count[MCAST_INCLUDE])
1466                                 return type == MLD2_MODE_IS_INCLUDE;
1467                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1468                                 psf->sf_count[MCAST_EXCLUDE];
1469                 }
1470                 return false;
1471         case MLD2_CHANGE_TO_INCLUDE:
1472                 if (gdeleted || sdeleted)
1473                         return false;
1474                 return psf->sf_count[MCAST_INCLUDE] != 0;
1475         case MLD2_CHANGE_TO_EXCLUDE:
1476                 if (gdeleted || sdeleted)
1477                         return false;
1478                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1479                     psf->sf_count[MCAST_INCLUDE])
1480                         return false;
1481                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1482                         psf->sf_count[MCAST_EXCLUDE];
1483         case MLD2_ALLOW_NEW_SOURCES:
1484                 if (gdeleted || !psf->sf_crcount)
1485                         return false;
1486                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1487         case MLD2_BLOCK_OLD_SOURCES:
1488                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1489                         return gdeleted || (psf->sf_crcount && sdeleted);
1490                 return psf->sf_crcount && !gdeleted && !sdeleted;
1491         }
1492         return false;
1493 }
1494
1495 static int
1496 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1497 {
1498         struct ip6_sf_list *psf;
1499         int scount = 0;
1500
1501         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1502                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1503                         continue;
1504                 scount++;
1505         }
1506         return scount;
1507 }
1508
1509 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1510                        struct net_device *dev,
1511                        const struct in6_addr *saddr,
1512                        const struct in6_addr *daddr,
1513                        int proto, int len)
1514 {
1515         struct ipv6hdr *hdr;
1516
1517         skb->protocol = htons(ETH_P_IPV6);
1518         skb->dev = dev;
1519
1520         skb_reset_network_header(skb);
1521         skb_put(skb, sizeof(struct ipv6hdr));
1522         hdr = ipv6_hdr(skb);
1523
1524         ip6_flow_hdr(hdr, 0, 0);
1525
1526         hdr->payload_len = htons(len);
1527         hdr->nexthdr = proto;
1528         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1529
1530         hdr->saddr = *saddr;
1531         hdr->daddr = *daddr;
1532 }
1533
1534 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1535 {
1536         struct net_device *dev = idev->dev;
1537         struct net *net = dev_net(dev);
1538         struct sock *sk = net->ipv6.igmp_sk;
1539         struct sk_buff *skb;
1540         struct mld2_report *pmr;
1541         struct in6_addr addr_buf;
1542         const struct in6_addr *saddr;
1543         int hlen = LL_RESERVED_SPACE(dev);
1544         int tlen = dev->needed_tailroom;
1545         int err;
1546         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1547                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1548                      IPV6_TLV_PADN, 0 };
1549
1550         /* we assume size > sizeof(ra) here */
1551         size += hlen + tlen;
1552         /* limit our allocations to order-0 page */
1553         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1554         skb = sock_alloc_send_skb(sk, size, 1, &err);
1555
1556         if (!skb)
1557                 return NULL;
1558
1559         skb->priority = TC_PRIO_CONTROL;
1560         skb_reserve(skb, hlen);
1561
1562         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1563                 /* <draft-ietf-magma-mld-source-05.txt>:
1564                  * use unspecified address as the source address
1565                  * when a valid link-local address is not available.
1566                  */
1567                 saddr = &in6addr_any;
1568         } else
1569                 saddr = &addr_buf;
1570
1571         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1572
1573         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1574
1575         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1576         skb_put(skb, sizeof(*pmr));
1577         pmr = (struct mld2_report *)skb_transport_header(skb);
1578         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1579         pmr->mld2r_resv1 = 0;
1580         pmr->mld2r_cksum = 0;
1581         pmr->mld2r_resv2 = 0;
1582         pmr->mld2r_ngrec = 0;
1583         return skb;
1584 }
1585
1586 static void mld_sendpack(struct sk_buff *skb)
1587 {
1588         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1589         struct mld2_report *pmr =
1590                               (struct mld2_report *)skb_transport_header(skb);
1591         int payload_len, mldlen;
1592         struct inet6_dev *idev;
1593         struct net *net = dev_net(skb->dev);
1594         int err;
1595         struct flowi6 fl6;
1596         struct dst_entry *dst;
1597
1598         rcu_read_lock();
1599         idev = __in6_dev_get(skb->dev);
1600         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1601
1602         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1603                 sizeof(*pip6);
1604         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1605         pip6->payload_len = htons(payload_len);
1606
1607         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1608                                            IPPROTO_ICMPV6,
1609                                            csum_partial(skb_transport_header(skb),
1610                                                         mldlen, 0));
1611
1612         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1613                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1614                          skb->dev->ifindex);
1615         dst = icmp6_dst_alloc(skb->dev, &fl6);
1616
1617         err = 0;
1618         if (IS_ERR(dst)) {
1619                 err = PTR_ERR(dst);
1620                 dst = NULL;
1621         }
1622         skb_dst_set(skb, dst);
1623         if (err)
1624                 goto err_out;
1625
1626         payload_len = skb->len;
1627
1628         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1629                       dst_output);
1630 out:
1631         if (!err) {
1632                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1633                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1634                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1635         } else {
1636                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1637         }
1638
1639         rcu_read_unlock();
1640         return;
1641
1642 err_out:
1643         kfree_skb(skb);
1644         goto out;
1645 }
1646
1647 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1648 {
1649         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1650 }
1651
1652 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1653         int type, struct mld2_grec **ppgr)
1654 {
1655         struct net_device *dev = pmc->idev->dev;
1656         struct mld2_report *pmr;
1657         struct mld2_grec *pgr;
1658
1659         if (!skb)
1660                 skb = mld_newpack(pmc->idev, dev->mtu);
1661         if (!skb)
1662                 return NULL;
1663         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1664         pgr->grec_type = type;
1665         pgr->grec_auxwords = 0;
1666         pgr->grec_nsrcs = 0;
1667         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1668         pmr = (struct mld2_report *)skb_transport_header(skb);
1669         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1670         *ppgr = pgr;
1671         return skb;
1672 }
1673
1674 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1675         skb_tailroom(skb)) : 0)
1676
1677 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1678         int type, int gdeleted, int sdeleted, int crsend)
1679 {
1680         struct inet6_dev *idev = pmc->idev;
1681         struct net_device *dev = idev->dev;
1682         struct mld2_report *pmr;
1683         struct mld2_grec *pgr = NULL;
1684         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1685         int scount, stotal, first, isquery, truncate;
1686
1687         if (pmc->mca_flags & MAF_NOREPORT)
1688                 return skb;
1689
1690         isquery = type == MLD2_MODE_IS_INCLUDE ||
1691                   type == MLD2_MODE_IS_EXCLUDE;
1692         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1693                     type == MLD2_CHANGE_TO_EXCLUDE;
1694
1695         stotal = scount = 0;
1696
1697         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1698
1699         if (!*psf_list)
1700                 goto empty_source;
1701
1702         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1703
1704         /* EX and TO_EX get a fresh packet, if needed */
1705         if (truncate) {
1706                 if (pmr && pmr->mld2r_ngrec &&
1707                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1708                         if (skb)
1709                                 mld_sendpack(skb);
1710                         skb = mld_newpack(idev, dev->mtu);
1711                 }
1712         }
1713         first = 1;
1714         psf_prev = NULL;
1715         for (psf=*psf_list; psf; psf=psf_next) {
1716                 struct in6_addr *psrc;
1717
1718                 psf_next = psf->sf_next;
1719
1720                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1721                         psf_prev = psf;
1722                         continue;
1723                 }
1724
1725                 /* clear marks on query responses */
1726                 if (isquery)
1727                         psf->sf_gsresp = 0;
1728
1729                 if (AVAILABLE(skb) < sizeof(*psrc) +
1730                     first*sizeof(struct mld2_grec)) {
1731                         if (truncate && !first)
1732                                 break;   /* truncate these */
1733                         if (pgr)
1734                                 pgr->grec_nsrcs = htons(scount);
1735                         if (skb)
1736                                 mld_sendpack(skb);
1737                         skb = mld_newpack(idev, dev->mtu);
1738                         first = 1;
1739                         scount = 0;
1740                 }
1741                 if (first) {
1742                         skb = add_grhead(skb, pmc, type, &pgr);
1743                         first = 0;
1744                 }
1745                 if (!skb)
1746                         return NULL;
1747                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1748                 *psrc = psf->sf_addr;
1749                 scount++; stotal++;
1750                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1751                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1752                         psf->sf_crcount--;
1753                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1754                                 if (psf_prev)
1755                                         psf_prev->sf_next = psf->sf_next;
1756                                 else
1757                                         *psf_list = psf->sf_next;
1758                                 kfree(psf);
1759                                 continue;
1760                         }
1761                 }
1762                 psf_prev = psf;
1763         }
1764
1765 empty_source:
1766         if (!stotal) {
1767                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1768                     type == MLD2_BLOCK_OLD_SOURCES)
1769                         return skb;
1770                 if (pmc->mca_crcount || isquery || crsend) {
1771                         /* make sure we have room for group header */
1772                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1773                                 mld_sendpack(skb);
1774                                 skb = NULL; /* add_grhead will get a new one */
1775                         }
1776                         skb = add_grhead(skb, pmc, type, &pgr);
1777                 }
1778         }
1779         if (pgr)
1780                 pgr->grec_nsrcs = htons(scount);
1781
1782         if (isquery)
1783                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1784         return skb;
1785 }
1786
1787 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1788 {
1789         struct sk_buff *skb = NULL;
1790         int type;
1791
1792         read_lock_bh(&idev->lock);
1793         if (!pmc) {
1794                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1795                         if (pmc->mca_flags & MAF_NOREPORT)
1796                                 continue;
1797                         spin_lock_bh(&pmc->mca_lock);
1798                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1799                                 type = MLD2_MODE_IS_EXCLUDE;
1800                         else
1801                                 type = MLD2_MODE_IS_INCLUDE;
1802                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1803                         spin_unlock_bh(&pmc->mca_lock);
1804                 }
1805         } else {
1806                 spin_lock_bh(&pmc->mca_lock);
1807                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1808                         type = MLD2_MODE_IS_EXCLUDE;
1809                 else
1810                         type = MLD2_MODE_IS_INCLUDE;
1811                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1812                 spin_unlock_bh(&pmc->mca_lock);
1813         }
1814         read_unlock_bh(&idev->lock);
1815         if (skb)
1816                 mld_sendpack(skb);
1817 }
1818
1819 /*
1820  * remove zero-count source records from a source filter list
1821  */
1822 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1823 {
1824         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1825
1826         psf_prev = NULL;
1827         for (psf=*ppsf; psf; psf = psf_next) {
1828                 psf_next = psf->sf_next;
1829                 if (psf->sf_crcount == 0) {
1830                         if (psf_prev)
1831                                 psf_prev->sf_next = psf->sf_next;
1832                         else
1833                                 *ppsf = psf->sf_next;
1834                         kfree(psf);
1835                 } else
1836                         psf_prev = psf;
1837         }
1838 }
1839
1840 static void mld_send_cr(struct inet6_dev *idev)
1841 {
1842         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1843         struct sk_buff *skb = NULL;
1844         int type, dtype;
1845
1846         read_lock_bh(&idev->lock);
1847         spin_lock(&idev->mc_lock);
1848
1849         /* deleted MCA's */
1850         pmc_prev = NULL;
1851         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1852                 pmc_next = pmc->next;
1853                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1854                         type = MLD2_BLOCK_OLD_SOURCES;
1855                         dtype = MLD2_BLOCK_OLD_SOURCES;
1856                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1857                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1858                 }
1859                 if (pmc->mca_crcount) {
1860                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1861                                 type = MLD2_CHANGE_TO_INCLUDE;
1862                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1863                         }
1864                         pmc->mca_crcount--;
1865                         if (pmc->mca_crcount == 0) {
1866                                 mld_clear_zeros(&pmc->mca_tomb);
1867                                 mld_clear_zeros(&pmc->mca_sources);
1868                         }
1869                 }
1870                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1871                     !pmc->mca_sources) {
1872                         if (pmc_prev)
1873                                 pmc_prev->next = pmc_next;
1874                         else
1875                                 idev->mc_tomb = pmc_next;
1876                         in6_dev_put(pmc->idev);
1877                         kfree(pmc);
1878                 } else
1879                         pmc_prev = pmc;
1880         }
1881         spin_unlock(&idev->mc_lock);
1882
1883         /* change recs */
1884         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1885                 spin_lock_bh(&pmc->mca_lock);
1886                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1887                         type = MLD2_BLOCK_OLD_SOURCES;
1888                         dtype = MLD2_ALLOW_NEW_SOURCES;
1889                 } else {
1890                         type = MLD2_ALLOW_NEW_SOURCES;
1891                         dtype = MLD2_BLOCK_OLD_SOURCES;
1892                 }
1893                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1894                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1895
1896                 /* filter mode changes */
1897                 if (pmc->mca_crcount) {
1898                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1899                                 type = MLD2_CHANGE_TO_EXCLUDE;
1900                         else
1901                                 type = MLD2_CHANGE_TO_INCLUDE;
1902                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1903                         pmc->mca_crcount--;
1904                 }
1905                 spin_unlock_bh(&pmc->mca_lock);
1906         }
1907         read_unlock_bh(&idev->lock);
1908         if (!skb)
1909                 return;
1910         (void) mld_sendpack(skb);
1911 }
1912
1913 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1914 {
1915         struct net *net = dev_net(dev);
1916         struct sock *sk = net->ipv6.igmp_sk;
1917         struct inet6_dev *idev;
1918         struct sk_buff *skb;
1919         struct mld_msg *hdr;
1920         const struct in6_addr *snd_addr, *saddr;
1921         struct in6_addr addr_buf;
1922         int hlen = LL_RESERVED_SPACE(dev);
1923         int tlen = dev->needed_tailroom;
1924         int err, len, payload_len, full_len;
1925         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1926                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1927                      IPV6_TLV_PADN, 0 };
1928         struct flowi6 fl6;
1929         struct dst_entry *dst;
1930
1931         if (type == ICMPV6_MGM_REDUCTION)
1932                 snd_addr = &in6addr_linklocal_allrouters;
1933         else
1934                 snd_addr = addr;
1935
1936         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1937         payload_len = len + sizeof(ra);
1938         full_len = sizeof(struct ipv6hdr) + payload_len;
1939
1940         rcu_read_lock();
1941         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1942                       IPSTATS_MIB_OUT, full_len);
1943         rcu_read_unlock();
1944
1945         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1946
1947         if (skb == NULL) {
1948                 rcu_read_lock();
1949                 IP6_INC_STATS(net, __in6_dev_get(dev),
1950                               IPSTATS_MIB_OUTDISCARDS);
1951                 rcu_read_unlock();
1952                 return;
1953         }
1954         skb->priority = TC_PRIO_CONTROL;
1955         skb_reserve(skb, hlen);
1956
1957         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1958                 /* <draft-ietf-magma-mld-source-05.txt>:
1959                  * use unspecified address as the source address
1960                  * when a valid link-local address is not available.
1961                  */
1962                 saddr = &in6addr_any;
1963         } else
1964                 saddr = &addr_buf;
1965
1966         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1967
1968         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1969
1970         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1971         memset(hdr, 0, sizeof(struct mld_msg));
1972         hdr->mld_type = type;
1973         hdr->mld_mca = *addr;
1974
1975         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1976                                          IPPROTO_ICMPV6,
1977                                          csum_partial(hdr, len, 0));
1978
1979         rcu_read_lock();
1980         idev = __in6_dev_get(skb->dev);
1981
1982         icmpv6_flow_init(sk, &fl6, type,
1983                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1984                          skb->dev->ifindex);
1985         dst = icmp6_dst_alloc(skb->dev, &fl6);
1986         if (IS_ERR(dst)) {
1987                 err = PTR_ERR(dst);
1988                 goto err_out;
1989         }
1990
1991         skb_dst_set(skb, dst);
1992         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1993                       dst_output);
1994 out:
1995         if (!err) {
1996                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1997                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1998                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1999         } else
2000                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2001
2002         rcu_read_unlock();
2003         return;
2004
2005 err_out:
2006         kfree_skb(skb);
2007         goto out;
2008 }
2009
2010 static void mld_send_initial_cr(struct inet6_dev *idev)
2011 {
2012         struct sk_buff *skb;
2013         struct ifmcaddr6 *pmc;
2014         int type;
2015
2016         if (mld_in_v1_mode(idev))
2017                 return;
2018
2019         skb = NULL;
2020         read_lock_bh(&idev->lock);
2021         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2022                 spin_lock_bh(&pmc->mca_lock);
2023                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2024                         type = MLD2_CHANGE_TO_EXCLUDE;
2025                 else
2026                         type = MLD2_CHANGE_TO_INCLUDE;
2027                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2028                 spin_unlock_bh(&pmc->mca_lock);
2029         }
2030         read_unlock_bh(&idev->lock);
2031         if (skb)
2032                 mld_sendpack(skb);
2033 }
2034
2035 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2036 {
2037         idev->mc_dad_count = idev->mc_qrv;
2038         if (idev->mc_dad_count) {
2039                 mld_send_initial_cr(idev);
2040                 idev->mc_dad_count--;
2041                 if (idev->mc_dad_count)
2042                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2043         }
2044 }
2045
2046 static void mld_dad_timer_expire(unsigned long data)
2047 {
2048         struct inet6_dev *idev = (struct inet6_dev *)data;
2049
2050         mld_send_initial_cr(idev);
2051         if (idev->mc_dad_count) {
2052                 idev->mc_dad_count--;
2053                 if (idev->mc_dad_count)
2054                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2055         }
2056         in6_dev_put(idev);
2057 }
2058
2059 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2060         const struct in6_addr *psfsrc)
2061 {
2062         struct ip6_sf_list *psf, *psf_prev;
2063         int rv = 0;
2064
2065         psf_prev = NULL;
2066         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2067                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2068                         break;
2069                 psf_prev = psf;
2070         }
2071         if (!psf || psf->sf_count[sfmode] == 0) {
2072                 /* source filter not found, or count wrong =>  bug */
2073                 return -ESRCH;
2074         }
2075         psf->sf_count[sfmode]--;
2076         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2077                 struct inet6_dev *idev = pmc->idev;
2078
2079                 /* no more filters for this source */
2080                 if (psf_prev)
2081                         psf_prev->sf_next = psf->sf_next;
2082                 else
2083                         pmc->mca_sources = psf->sf_next;
2084                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2085                     !mld_in_v1_mode(idev)) {
2086                         psf->sf_crcount = idev->mc_qrv;
2087                         psf->sf_next = pmc->mca_tomb;
2088                         pmc->mca_tomb = psf;
2089                         rv = 1;
2090                 } else
2091                         kfree(psf);
2092         }
2093         return rv;
2094 }
2095
2096 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2097                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2098                           int delta)
2099 {
2100         struct ifmcaddr6 *pmc;
2101         int     changerec = 0;
2102         int     i, err;
2103
2104         if (!idev)
2105                 return -ENODEV;
2106         read_lock_bh(&idev->lock);
2107         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2108                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2109                         break;
2110         }
2111         if (!pmc) {
2112                 /* MCA not found?? bug */
2113                 read_unlock_bh(&idev->lock);
2114                 return -ESRCH;
2115         }
2116         spin_lock_bh(&pmc->mca_lock);
2117         sf_markstate(pmc);
2118         if (!delta) {
2119                 if (!pmc->mca_sfcount[sfmode]) {
2120                         spin_unlock_bh(&pmc->mca_lock);
2121                         read_unlock_bh(&idev->lock);
2122                         return -EINVAL;
2123                 }
2124                 pmc->mca_sfcount[sfmode]--;
2125         }
2126         err = 0;
2127         for (i=0; i<sfcount; i++) {
2128                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2129
2130                 changerec |= rv > 0;
2131                 if (!err && rv < 0)
2132                         err = rv;
2133         }
2134         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2135             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2136             pmc->mca_sfcount[MCAST_INCLUDE]) {
2137                 struct ip6_sf_list *psf;
2138
2139                 /* filter mode change */
2140                 pmc->mca_sfmode = MCAST_INCLUDE;
2141                 pmc->mca_crcount = idev->mc_qrv;
2142                 idev->mc_ifc_count = pmc->mca_crcount;
2143                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2144                         psf->sf_crcount = 0;
2145                 mld_ifc_event(pmc->idev);
2146         } else if (sf_setstate(pmc) || changerec)
2147                 mld_ifc_event(pmc->idev);
2148         spin_unlock_bh(&pmc->mca_lock);
2149         read_unlock_bh(&idev->lock);
2150         return err;
2151 }
2152
2153 /*
2154  * Add multicast single-source filter to the interface list
2155  */
2156 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2157         const struct in6_addr *psfsrc)
2158 {
2159         struct ip6_sf_list *psf, *psf_prev;
2160
2161         psf_prev = NULL;
2162         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2163                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2164                         break;
2165                 psf_prev = psf;
2166         }
2167         if (!psf) {
2168                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2169                 if (!psf)
2170                         return -ENOBUFS;
2171
2172                 psf->sf_addr = *psfsrc;
2173                 if (psf_prev) {
2174                         psf_prev->sf_next = psf;
2175                 } else
2176                         pmc->mca_sources = psf;
2177         }
2178         psf->sf_count[sfmode]++;
2179         return 0;
2180 }
2181
2182 static void sf_markstate(struct ifmcaddr6 *pmc)
2183 {
2184         struct ip6_sf_list *psf;
2185         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2186
2187         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2188                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2189                         psf->sf_oldin = mca_xcount ==
2190                                 psf->sf_count[MCAST_EXCLUDE] &&
2191                                 !psf->sf_count[MCAST_INCLUDE];
2192                 } else
2193                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2194 }
2195
2196 static int sf_setstate(struct ifmcaddr6 *pmc)
2197 {
2198         struct ip6_sf_list *psf, *dpsf;
2199         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2200         int qrv = pmc->idev->mc_qrv;
2201         int new_in, rv;
2202
2203         rv = 0;
2204         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2205                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2206                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2207                                 !psf->sf_count[MCAST_INCLUDE];
2208                 } else
2209                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2210                 if (new_in) {
2211                         if (!psf->sf_oldin) {
2212                                 struct ip6_sf_list *prev = NULL;
2213
2214                                 for (dpsf=pmc->mca_tomb; dpsf;
2215                                      dpsf=dpsf->sf_next) {
2216                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2217                                             &psf->sf_addr))
2218                                                 break;
2219                                         prev = dpsf;
2220                                 }
2221                                 if (dpsf) {
2222                                         if (prev)
2223                                                 prev->sf_next = dpsf->sf_next;
2224                                         else
2225                                                 pmc->mca_tomb = dpsf->sf_next;
2226                                         kfree(dpsf);
2227                                 }
2228                                 psf->sf_crcount = qrv;
2229                                 rv++;
2230                         }
2231                 } else if (psf->sf_oldin) {
2232                         psf->sf_crcount = 0;
2233                         /*
2234                          * add or update "delete" records if an active filter
2235                          * is now inactive
2236                          */
2237                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2238                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2239                                     &psf->sf_addr))
2240                                         break;
2241                         if (!dpsf) {
2242                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2243                                 if (!dpsf)
2244                                         continue;
2245                                 *dpsf = *psf;
2246                                 /* pmc->mca_lock held by callers */
2247                                 dpsf->sf_next = pmc->mca_tomb;
2248                                 pmc->mca_tomb = dpsf;
2249                         }
2250                         dpsf->sf_crcount = qrv;
2251                         rv++;
2252                 }
2253         }
2254         return rv;
2255 }
2256
2257 /*
2258  * Add multicast source filter list to the interface list
2259  */
2260 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2261                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2262                           int delta)
2263 {
2264         struct ifmcaddr6 *pmc;
2265         int     isexclude;
2266         int     i, err;
2267
2268         if (!idev)
2269                 return -ENODEV;
2270         read_lock_bh(&idev->lock);
2271         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2272                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2273                         break;
2274         }
2275         if (!pmc) {
2276                 /* MCA not found?? bug */
2277                 read_unlock_bh(&idev->lock);
2278                 return -ESRCH;
2279         }
2280         spin_lock_bh(&pmc->mca_lock);
2281
2282         sf_markstate(pmc);
2283         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2284         if (!delta)
2285                 pmc->mca_sfcount[sfmode]++;
2286         err = 0;
2287         for (i=0; i<sfcount; i++) {
2288                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2289                 if (err)
2290                         break;
2291         }
2292         if (err) {
2293                 int j;
2294
2295                 if (!delta)
2296                         pmc->mca_sfcount[sfmode]--;
2297                 for (j=0; j<i; j++)
2298                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2299         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2300                 struct ip6_sf_list *psf;
2301
2302                 /* filter mode change */
2303                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2304                         pmc->mca_sfmode = MCAST_EXCLUDE;
2305                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2306                         pmc->mca_sfmode = MCAST_INCLUDE;
2307                 /* else no filters; keep old mode for reports */
2308
2309                 pmc->mca_crcount = idev->mc_qrv;
2310                 idev->mc_ifc_count = pmc->mca_crcount;
2311                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2312                         psf->sf_crcount = 0;
2313                 mld_ifc_event(idev);
2314         } else if (sf_setstate(pmc))
2315                 mld_ifc_event(idev);
2316         spin_unlock_bh(&pmc->mca_lock);
2317         read_unlock_bh(&idev->lock);
2318         return err;
2319 }
2320
2321 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2322 {
2323         struct ip6_sf_list *psf, *nextpsf;
2324
2325         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2326                 nextpsf = psf->sf_next;
2327                 kfree(psf);
2328         }
2329         pmc->mca_tomb = NULL;
2330         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2331                 nextpsf = psf->sf_next;
2332                 kfree(psf);
2333         }
2334         pmc->mca_sources = NULL;
2335         pmc->mca_sfmode = MCAST_EXCLUDE;
2336         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2337         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2338 }
2339
2340
2341 static void igmp6_join_group(struct ifmcaddr6 *ma)
2342 {
2343         unsigned long delay;
2344
2345         if (ma->mca_flags & MAF_NOREPORT)
2346                 return;
2347
2348         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2349
2350         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2351
2352         spin_lock_bh(&ma->mca_lock);
2353         if (del_timer(&ma->mca_timer)) {
2354                 atomic_dec(&ma->mca_refcnt);
2355                 delay = ma->mca_timer.expires - jiffies;
2356         }
2357
2358         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2359                 atomic_inc(&ma->mca_refcnt);
2360         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2361         spin_unlock_bh(&ma->mca_lock);
2362 }
2363
2364 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2365                             struct inet6_dev *idev)
2366 {
2367         int err;
2368
2369         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2370          * so no other readers or writers of iml or its sflist
2371          */
2372         if (!iml->sflist) {
2373                 /* any-source empty exclude case */
2374                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2375         }
2376         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2377                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2378         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2379         iml->sflist = NULL;
2380         return err;
2381 }
2382
2383 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2384 {
2385         if (mld_in_v1_mode(ma->idev)) {
2386                 if (ma->mca_flags & MAF_LAST_REPORTER)
2387                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2388                                 ICMPV6_MGM_REDUCTION);
2389         } else {
2390                 mld_add_delrec(ma->idev, ma);
2391                 mld_ifc_event(ma->idev);
2392         }
2393 }
2394
2395 static void mld_gq_timer_expire(unsigned long data)
2396 {
2397         struct inet6_dev *idev = (struct inet6_dev *)data;
2398
2399         idev->mc_gq_running = 0;
2400         mld_send_report(idev, NULL);
2401         in6_dev_put(idev);
2402 }
2403
2404 static void mld_ifc_timer_expire(unsigned long data)
2405 {
2406         struct inet6_dev *idev = (struct inet6_dev *)data;
2407
2408         mld_send_cr(idev);
2409         if (idev->mc_ifc_count) {
2410                 idev->mc_ifc_count--;
2411                 if (idev->mc_ifc_count)
2412                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2413         }
2414         in6_dev_put(idev);
2415 }
2416
2417 static void mld_ifc_event(struct inet6_dev *idev)
2418 {
2419         if (mld_in_v1_mode(idev))
2420                 return;
2421         idev->mc_ifc_count = idev->mc_qrv;
2422         mld_ifc_start_timer(idev, 1);
2423 }
2424
2425
2426 static void igmp6_timer_handler(unsigned long data)
2427 {
2428         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2429
2430         if (mld_in_v1_mode(ma->idev))
2431                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2432         else
2433                 mld_send_report(ma->idev, ma);
2434
2435         spin_lock(&ma->mca_lock);
2436         ma->mca_flags |=  MAF_LAST_REPORTER;
2437         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2438         spin_unlock(&ma->mca_lock);
2439         ma_put(ma);
2440 }
2441
2442 /* Device changing type */
2443
2444 void ipv6_mc_unmap(struct inet6_dev *idev)
2445 {
2446         struct ifmcaddr6 *i;
2447
2448         /* Install multicast list, except for all-nodes (already installed) */
2449
2450         read_lock_bh(&idev->lock);
2451         for (i = idev->mc_list; i; i = i->next)
2452                 igmp6_group_dropped(i);
2453         read_unlock_bh(&idev->lock);
2454 }
2455
2456 void ipv6_mc_remap(struct inet6_dev *idev)
2457 {
2458         ipv6_mc_up(idev);
2459 }
2460
2461 /* Device going down */
2462
2463 void ipv6_mc_down(struct inet6_dev *idev)
2464 {
2465         struct ifmcaddr6 *i;
2466
2467         /* Withdraw multicast list */
2468
2469         read_lock_bh(&idev->lock);
2470         mld_ifc_stop_timer(idev);
2471         mld_gq_stop_timer(idev);
2472         mld_dad_stop_timer(idev);
2473
2474         for (i = idev->mc_list; i; i=i->next)
2475                 igmp6_group_dropped(i);
2476         read_unlock_bh(&idev->lock);
2477
2478         mld_clear_delrec(idev);
2479 }
2480
2481
2482 /* Device going up */
2483
2484 void ipv6_mc_up(struct inet6_dev *idev)
2485 {
2486         struct ifmcaddr6 *i;
2487
2488         /* Install multicast list, except for all-nodes (already installed) */
2489
2490         read_lock_bh(&idev->lock);
2491         for (i = idev->mc_list; i; i=i->next)
2492                 igmp6_group_added(i);
2493         read_unlock_bh(&idev->lock);
2494 }
2495
2496 /* IPv6 device initialization. */
2497
2498 void ipv6_mc_init_dev(struct inet6_dev *idev)
2499 {
2500         write_lock_bh(&idev->lock);
2501         spin_lock_init(&idev->mc_lock);
2502         idev->mc_gq_running = 0;
2503         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2504                         (unsigned long)idev);
2505         idev->mc_tomb = NULL;
2506         idev->mc_ifc_count = 0;
2507         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2508                         (unsigned long)idev);
2509         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2510                     (unsigned long)idev);
2511
2512         idev->mc_qrv = MLD_QRV_DEFAULT;
2513         idev->mc_qi = MLD_QI_DEFAULT;
2514         idev->mc_qri = MLD_QRI_DEFAULT;
2515
2516         idev->mc_maxdelay = unsolicited_report_interval(idev);
2517         idev->mc_v1_seen = 0;
2518         write_unlock_bh(&idev->lock);
2519 }
2520
2521 /*
2522  *      Device is about to be destroyed: clean up.
2523  */
2524
2525 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2526 {
2527         struct ifmcaddr6 *i;
2528
2529         /* Deactivate timers */
2530         ipv6_mc_down(idev);
2531
2532         /* Delete all-nodes address. */
2533         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2534          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2535          * fail.
2536          */
2537         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2538
2539         if (idev->cnf.forwarding)
2540                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2541
2542         write_lock_bh(&idev->lock);
2543         while ((i = idev->mc_list) != NULL) {
2544                 idev->mc_list = i->next;
2545                 write_unlock_bh(&idev->lock);
2546
2547                 igmp6_group_dropped(i);
2548                 ma_put(i);
2549
2550                 write_lock_bh(&idev->lock);
2551         }
2552         write_unlock_bh(&idev->lock);
2553 }
2554
2555 #ifdef CONFIG_PROC_FS
2556 struct igmp6_mc_iter_state {
2557         struct seq_net_private p;
2558         struct net_device *dev;
2559         struct inet6_dev *idev;
2560 };
2561
2562 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2563
2564 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2565 {
2566         struct ifmcaddr6 *im = NULL;
2567         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2568         struct net *net = seq_file_net(seq);
2569
2570         state->idev = NULL;
2571         for_each_netdev_rcu(net, state->dev) {
2572                 struct inet6_dev *idev;
2573                 idev = __in6_dev_get(state->dev);
2574                 if (!idev)
2575                         continue;
2576                 read_lock_bh(&idev->lock);
2577                 im = idev->mc_list;
2578                 if (im) {
2579                         state->idev = idev;
2580                         break;
2581                 }
2582                 read_unlock_bh(&idev->lock);
2583         }
2584         return im;
2585 }
2586
2587 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2588 {
2589         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2590
2591         im = im->next;
2592         while (!im) {
2593                 if (likely(state->idev != NULL))
2594                         read_unlock_bh(&state->idev->lock);
2595
2596                 state->dev = next_net_device_rcu(state->dev);
2597                 if (!state->dev) {
2598                         state->idev = NULL;
2599                         break;
2600                 }
2601                 state->idev = __in6_dev_get(state->dev);
2602                 if (!state->idev)
2603                         continue;
2604                 read_lock_bh(&state->idev->lock);
2605                 im = state->idev->mc_list;
2606         }
2607         return im;
2608 }
2609
2610 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2611 {
2612         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2613         if (im)
2614                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2615                         --pos;
2616         return pos ? NULL : im;
2617 }
2618
2619 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2620         __acquires(RCU)
2621 {
2622         rcu_read_lock();
2623         return igmp6_mc_get_idx(seq, *pos);
2624 }
2625
2626 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2627 {
2628         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2629
2630         ++*pos;
2631         return im;
2632 }
2633
2634 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2635         __releases(RCU)
2636 {
2637         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2638
2639         if (likely(state->idev != NULL)) {
2640                 read_unlock_bh(&state->idev->lock);
2641                 state->idev = NULL;
2642         }
2643         state->dev = NULL;
2644         rcu_read_unlock();
2645 }
2646
2647 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2648 {
2649         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2650         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2651
2652         seq_printf(seq,
2653                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2654                    state->dev->ifindex, state->dev->name,
2655                    &im->mca_addr,
2656                    im->mca_users, im->mca_flags,
2657                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2658                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2659         return 0;
2660 }
2661
2662 static const struct seq_operations igmp6_mc_seq_ops = {
2663         .start  =       igmp6_mc_seq_start,
2664         .next   =       igmp6_mc_seq_next,
2665         .stop   =       igmp6_mc_seq_stop,
2666         .show   =       igmp6_mc_seq_show,
2667 };
2668
2669 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2670 {
2671         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2672                             sizeof(struct igmp6_mc_iter_state));
2673 }
2674
2675 static const struct file_operations igmp6_mc_seq_fops = {
2676         .owner          =       THIS_MODULE,
2677         .open           =       igmp6_mc_seq_open,
2678         .read           =       seq_read,
2679         .llseek         =       seq_lseek,
2680         .release        =       seq_release_net,
2681 };
2682
2683 struct igmp6_mcf_iter_state {
2684         struct seq_net_private p;
2685         struct net_device *dev;
2686         struct inet6_dev *idev;
2687         struct ifmcaddr6 *im;
2688 };
2689
2690 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2691
2692 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2693 {
2694         struct ip6_sf_list *psf = NULL;
2695         struct ifmcaddr6 *im = NULL;
2696         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2697         struct net *net = seq_file_net(seq);
2698
2699         state->idev = NULL;
2700         state->im = NULL;
2701         for_each_netdev_rcu(net, state->dev) {
2702                 struct inet6_dev *idev;
2703                 idev = __in6_dev_get(state->dev);
2704                 if (unlikely(idev == NULL))
2705                         continue;
2706                 read_lock_bh(&idev->lock);
2707                 im = idev->mc_list;
2708                 if (likely(im != NULL)) {
2709                         spin_lock_bh(&im->mca_lock);
2710                         psf = im->mca_sources;
2711                         if (likely(psf != NULL)) {
2712                                 state->im = im;
2713                                 state->idev = idev;
2714                                 break;
2715                         }
2716                         spin_unlock_bh(&im->mca_lock);
2717                 }
2718                 read_unlock_bh(&idev->lock);
2719         }
2720         return psf;
2721 }
2722
2723 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2724 {
2725         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2726
2727         psf = psf->sf_next;
2728         while (!psf) {
2729                 spin_unlock_bh(&state->im->mca_lock);
2730                 state->im = state->im->next;
2731                 while (!state->im) {
2732                         if (likely(state->idev != NULL))
2733                                 read_unlock_bh(&state->idev->lock);
2734
2735                         state->dev = next_net_device_rcu(state->dev);
2736                         if (!state->dev) {
2737                                 state->idev = NULL;
2738                                 goto out;
2739                         }
2740                         state->idev = __in6_dev_get(state->dev);
2741                         if (!state->idev)
2742                                 continue;
2743                         read_lock_bh(&state->idev->lock);
2744                         state->im = state->idev->mc_list;
2745                 }
2746                 if (!state->im)
2747                         break;
2748                 spin_lock_bh(&state->im->mca_lock);
2749                 psf = state->im->mca_sources;
2750         }
2751 out:
2752         return psf;
2753 }
2754
2755 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2756 {
2757         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2758         if (psf)
2759                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2760                         --pos;
2761         return pos ? NULL : psf;
2762 }
2763
2764 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2765         __acquires(RCU)
2766 {
2767         rcu_read_lock();
2768         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2769 }
2770
2771 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2772 {
2773         struct ip6_sf_list *psf;
2774         if (v == SEQ_START_TOKEN)
2775                 psf = igmp6_mcf_get_first(seq);
2776         else
2777                 psf = igmp6_mcf_get_next(seq, v);
2778         ++*pos;
2779         return psf;
2780 }
2781
2782 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2783         __releases(RCU)
2784 {
2785         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2786         if (likely(state->im != NULL)) {
2787                 spin_unlock_bh(&state->im->mca_lock);
2788                 state->im = NULL;
2789         }
2790         if (likely(state->idev != NULL)) {
2791                 read_unlock_bh(&state->idev->lock);
2792                 state->idev = NULL;
2793         }
2794         state->dev = NULL;
2795         rcu_read_unlock();
2796 }
2797
2798 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2799 {
2800         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2801         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2802
2803         if (v == SEQ_START_TOKEN) {
2804                 seq_printf(seq,
2805                            "%3s %6s "
2806                            "%32s %32s %6s %6s\n", "Idx",
2807                            "Device", "Multicast Address",
2808                            "Source Address", "INC", "EXC");
2809         } else {
2810                 seq_printf(seq,
2811                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2812                            state->dev->ifindex, state->dev->name,
2813                            &state->im->mca_addr,
2814                            &psf->sf_addr,
2815                            psf->sf_count[MCAST_INCLUDE],
2816                            psf->sf_count[MCAST_EXCLUDE]);
2817         }
2818         return 0;
2819 }
2820
2821 static const struct seq_operations igmp6_mcf_seq_ops = {
2822         .start  =       igmp6_mcf_seq_start,
2823         .next   =       igmp6_mcf_seq_next,
2824         .stop   =       igmp6_mcf_seq_stop,
2825         .show   =       igmp6_mcf_seq_show,
2826 };
2827
2828 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2829 {
2830         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2831                             sizeof(struct igmp6_mcf_iter_state));
2832 }
2833
2834 static const struct file_operations igmp6_mcf_seq_fops = {
2835         .owner          =       THIS_MODULE,
2836         .open           =       igmp6_mcf_seq_open,
2837         .read           =       seq_read,
2838         .llseek         =       seq_lseek,
2839         .release        =       seq_release_net,
2840 };
2841
2842 static int __net_init igmp6_proc_init(struct net *net)
2843 {
2844         int err;
2845
2846         err = -ENOMEM;
2847         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2848                 goto out;
2849         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2850                          &igmp6_mcf_seq_fops))
2851                 goto out_proc_net_igmp6;
2852
2853         err = 0;
2854 out:
2855         return err;
2856
2857 out_proc_net_igmp6:
2858         remove_proc_entry("igmp6", net->proc_net);
2859         goto out;
2860 }
2861
2862 static void __net_exit igmp6_proc_exit(struct net *net)
2863 {
2864         remove_proc_entry("mcfilter6", net->proc_net);
2865         remove_proc_entry("igmp6", net->proc_net);
2866 }
2867 #else
2868 static inline int igmp6_proc_init(struct net *net)
2869 {
2870         return 0;
2871 }
2872 static inline void igmp6_proc_exit(struct net *net)
2873 {
2874 }
2875 #endif
2876
2877 static int __net_init igmp6_net_init(struct net *net)
2878 {
2879         int err;
2880
2881         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2882                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2883         if (err < 0) {
2884                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2885                        err);
2886                 goto out;
2887         }
2888
2889         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2890
2891         err = igmp6_proc_init(net);
2892         if (err)
2893                 goto out_sock_create;
2894 out:
2895         return err;
2896
2897 out_sock_create:
2898         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2899         goto out;
2900 }
2901
2902 static void __net_exit igmp6_net_exit(struct net *net)
2903 {
2904         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2905         igmp6_proc_exit(net);
2906 }
2907
2908 static struct pernet_operations igmp6_net_ops = {
2909         .init = igmp6_net_init,
2910         .exit = igmp6_net_exit,
2911 };
2912
2913 int __init igmp6_init(void)
2914 {
2915         return register_pernet_subsys(&igmp6_net_ops);
2916 }
2917
2918 void igmp6_cleanup(void)
2919 {
2920         unregister_pernet_subsys(&igmp6_net_ops);
2921 }