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 = net_random() % 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_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1010 {
1011         unsigned long tv = net_random() % delay;
1012
1013         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1014                 in6_dev_hold(idev);
1015 }
1016
1017 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1018 {
1019         unsigned long tv = net_random() % delay;
1020
1021         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1022                 in6_dev_hold(idev);
1023 }
1024
1025 /*
1026  *      IGMP handling (alias multicast ICMPv6 messages)
1027  */
1028
1029 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1030 {
1031         unsigned long delay = resptime;
1032
1033         /* Do not start timer for these addresses */
1034         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1035             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1036                 return;
1037
1038         if (del_timer(&ma->mca_timer)) {
1039                 atomic_dec(&ma->mca_refcnt);
1040                 delay = ma->mca_timer.expires - jiffies;
1041         }
1042
1043         if (delay >= resptime)
1044                 delay = net_random() % resptime;
1045
1046         ma->mca_timer.expires = jiffies + delay;
1047         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1048                 atomic_inc(&ma->mca_refcnt);
1049         ma->mca_flags |= MAF_TIMER_RUNNING;
1050 }
1051
1052 /* mark EXCLUDE-mode sources */
1053 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1054                              const struct in6_addr *srcs)
1055 {
1056         struct ip6_sf_list *psf;
1057         int i, scount;
1058
1059         scount = 0;
1060         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1061                 if (scount == nsrcs)
1062                         break;
1063                 for (i=0; i<nsrcs; i++) {
1064                         /* skip inactive filters */
1065                         if (psf->sf_count[MCAST_INCLUDE] ||
1066                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1067                             psf->sf_count[MCAST_EXCLUDE])
1068                                 break;
1069                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1070                                 scount++;
1071                                 break;
1072                         }
1073                 }
1074         }
1075         pmc->mca_flags &= ~MAF_GSQUERY;
1076         if (scount == nsrcs)    /* all sources excluded */
1077                 return false;
1078         return true;
1079 }
1080
1081 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1082                             const struct in6_addr *srcs)
1083 {
1084         struct ip6_sf_list *psf;
1085         int i, scount;
1086
1087         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1088                 return mld_xmarksources(pmc, nsrcs, srcs);
1089
1090         /* mark INCLUDE-mode sources */
1091
1092         scount = 0;
1093         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1094                 if (scount == nsrcs)
1095                         break;
1096                 for (i=0; i<nsrcs; i++) {
1097                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1098                                 psf->sf_gsresp = 1;
1099                                 scount++;
1100                                 break;
1101                         }
1102                 }
1103         }
1104         if (!scount) {
1105                 pmc->mca_flags &= ~MAF_GSQUERY;
1106                 return false;
1107         }
1108         pmc->mca_flags |= MAF_GSQUERY;
1109         return true;
1110 }
1111
1112 static int mld_force_mld_version(const struct inet6_dev *idev)
1113 {
1114         /* Normally, both are 0 here. If enforcement to a particular is
1115          * being used, individual device enforcement will have a lower
1116          * precedence over 'all' device (.../conf/all/force_mld_version).
1117          */
1118
1119         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1120                 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1121         else
1122                 return idev->cnf.force_mld_version;
1123 }
1124
1125 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1126 {
1127         return mld_force_mld_version(idev) == 2;
1128 }
1129
1130 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1131 {
1132         return mld_force_mld_version(idev) == 1;
1133 }
1134
1135 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1136 {
1137         if (mld_in_v2_mode_only(idev))
1138                 return false;
1139         if (mld_in_v1_mode_only(idev))
1140                 return true;
1141         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1142                 return true;
1143
1144         return false;
1145 }
1146
1147 static void mld_set_v1_mode(struct inet6_dev *idev)
1148 {
1149         /* RFC3810, relevant sections:
1150          *  - 9.1. Robustness Variable
1151          *  - 9.2. Query Interval
1152          *  - 9.3. Query Response Interval
1153          *  - 9.12. Older Version Querier Present Timeout
1154          */
1155         unsigned long switchback;
1156
1157         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1158
1159         idev->mc_v1_seen = jiffies + switchback;
1160 }
1161
1162 static void mld_update_qrv(struct inet6_dev *idev,
1163                            const struct mld2_query *mlh2)
1164 {
1165         /* RFC3810, relevant sections:
1166          *  - 5.1.8. QRV (Querier's Robustness Variable)
1167          *  - 9.1. Robustness Variable
1168          */
1169
1170         /* The value of the Robustness Variable MUST NOT be zero,
1171          * and SHOULD NOT be one. Catch this here if we ever run
1172          * into such a case in future.
1173          */
1174         WARN_ON(idev->mc_qrv == 0);
1175
1176         if (mlh2->mld2q_qrv > 0)
1177                 idev->mc_qrv = mlh2->mld2q_qrv;
1178
1179         if (unlikely(idev->mc_qrv < 2)) {
1180                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1181                                      idev->mc_qrv, MLD_QRV_DEFAULT);
1182                 idev->mc_qrv = MLD_QRV_DEFAULT;
1183         }
1184 }
1185
1186 static void mld_update_qi(struct inet6_dev *idev,
1187                           const struct mld2_query *mlh2)
1188 {
1189         /* RFC3810, relevant sections:
1190          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1191          *  - 9.2. Query Interval
1192          *  - 9.12. Older Version Querier Present Timeout
1193          *    (the [Query Interval] in the last Query received)
1194          */
1195         unsigned long mc_qqi;
1196
1197         if (mlh2->mld2q_qqic < 128) {
1198                 mc_qqi = mlh2->mld2q_qqic;
1199         } else {
1200                 unsigned long mc_man, mc_exp;
1201
1202                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1203                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1204
1205                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1206         }
1207
1208         idev->mc_qi = mc_qqi * HZ;
1209 }
1210
1211 static void mld_update_qri(struct inet6_dev *idev,
1212                            const struct mld2_query *mlh2)
1213 {
1214         /* RFC3810, relevant sections:
1215          *  - 5.1.3. Maximum Response Code
1216          *  - 9.3. Query Response Interval
1217          */
1218         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1219 }
1220
1221 /* called with rcu_read_lock() */
1222 int igmp6_event_query(struct sk_buff *skb)
1223 {
1224         struct mld2_query *mlh2 = NULL;
1225         struct ifmcaddr6 *ma;
1226         const struct in6_addr *group;
1227         unsigned long max_delay;
1228         struct inet6_dev *idev;
1229         struct mld_msg *mld;
1230         int group_type;
1231         int mark = 0;
1232         int len;
1233
1234         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1235                 return -EINVAL;
1236
1237         /* compute payload length excluding extension headers */
1238         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1239         len -= skb_network_header_len(skb);
1240
1241         /* Drop queries with not link local source */
1242         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1243                 return -EINVAL;
1244
1245         idev = __in6_dev_get(skb->dev);
1246         if (idev == NULL)
1247                 return 0;
1248
1249         mld = (struct mld_msg *)icmp6_hdr(skb);
1250         group = &mld->mld_mca;
1251         group_type = ipv6_addr_type(group);
1252
1253         if (group_type != IPV6_ADDR_ANY &&
1254             !(group_type&IPV6_ADDR_MULTICAST))
1255                 return -EINVAL;
1256
1257         if (len == MLD_V1_QUERY_LEN) {
1258                 unsigned long mldv1_md;
1259
1260                 /* Ignore v1 queries */
1261                 if (mld_in_v2_mode_only(idev))
1262                         return 0;
1263
1264                 /* MLDv1 router present */
1265                 mldv1_md = ntohs(mld->mld_maxdelay);
1266                 max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1267
1268                 mld_set_v1_mode(idev);
1269
1270                 /* cancel MLDv2 report timer */
1271                 idev->mc_gq_running = 0;
1272                 if (del_timer(&idev->mc_gq_timer))
1273                         __in6_dev_put(idev);
1274
1275                 /* cancel the interface change timer */
1276                 idev->mc_ifc_count = 0;
1277                 if (del_timer(&idev->mc_ifc_timer))
1278                         __in6_dev_put(idev);
1279                 /* clear deleted report items */
1280                 mld_clear_delrec(idev);
1281         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1282                 int srcs_offset = sizeof(struct mld2_query) -
1283                                   sizeof(struct icmp6hdr);
1284
1285                 /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
1286                 if (mld_in_v1_mode(idev))
1287                         return 0;
1288                 if (!pskb_may_pull(skb, srcs_offset))
1289                         return -EINVAL;
1290
1291                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1292
1293                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mlh2)), 1UL);
1294                 idev->mc_maxdelay = max_delay;
1295
1296                 mld_update_qrv(idev, mlh2);
1297                 mld_update_qi(idev, mlh2);
1298                 mld_update_qri(idev, mlh2);
1299
1300                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1301                         if (mlh2->mld2q_nsrcs)
1302                                 return -EINVAL; /* no sources allowed */
1303
1304                         mld_gq_start_timer(idev);
1305                         return 0;
1306                 }
1307                 /* mark sources to include, if group & source-specific */
1308                 if (mlh2->mld2q_nsrcs != 0) {
1309                         if (!pskb_may_pull(skb, srcs_offset +
1310                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1311                                 return -EINVAL;
1312
1313                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1314                         mark = 1;
1315                 }
1316         } else
1317                 return -EINVAL;
1318
1319         read_lock_bh(&idev->lock);
1320         if (group_type == IPV6_ADDR_ANY) {
1321                 for (ma = idev->mc_list; ma; ma=ma->next) {
1322                         spin_lock_bh(&ma->mca_lock);
1323                         igmp6_group_queried(ma, max_delay);
1324                         spin_unlock_bh(&ma->mca_lock);
1325                 }
1326         } else {
1327                 for (ma = idev->mc_list; ma; ma=ma->next) {
1328                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1329                                 continue;
1330                         spin_lock_bh(&ma->mca_lock);
1331                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1332                                 /* gsquery <- gsquery && mark */
1333                                 if (!mark)
1334                                         ma->mca_flags &= ~MAF_GSQUERY;
1335                         } else {
1336                                 /* gsquery <- mark */
1337                                 if (mark)
1338                                         ma->mca_flags |= MAF_GSQUERY;
1339                                 else
1340                                         ma->mca_flags &= ~MAF_GSQUERY;
1341                         }
1342                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1343                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1344                                 igmp6_group_queried(ma, max_delay);
1345                         spin_unlock_bh(&ma->mca_lock);
1346                         break;
1347                 }
1348         }
1349         read_unlock_bh(&idev->lock);
1350
1351         return 0;
1352 }
1353
1354 /* called with rcu_read_lock() */
1355 int igmp6_event_report(struct sk_buff *skb)
1356 {
1357         struct ifmcaddr6 *ma;
1358         struct inet6_dev *idev;
1359         struct mld_msg *mld;
1360         int addr_type;
1361
1362         /* Our own report looped back. Ignore it. */
1363         if (skb->pkt_type == PACKET_LOOPBACK)
1364                 return 0;
1365
1366         /* send our report if the MC router may not have heard this report */
1367         if (skb->pkt_type != PACKET_MULTICAST &&
1368             skb->pkt_type != PACKET_BROADCAST)
1369                 return 0;
1370
1371         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1372                 return -EINVAL;
1373
1374         mld = (struct mld_msg *)icmp6_hdr(skb);
1375
1376         /* Drop reports with not link local source */
1377         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1378         if (addr_type != IPV6_ADDR_ANY &&
1379             !(addr_type&IPV6_ADDR_LINKLOCAL))
1380                 return -EINVAL;
1381
1382         idev = __in6_dev_get(skb->dev);
1383         if (idev == NULL)
1384                 return -ENODEV;
1385
1386         /*
1387          *      Cancel the timer for this group
1388          */
1389
1390         read_lock_bh(&idev->lock);
1391         for (ma = idev->mc_list; ma; ma=ma->next) {
1392                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1393                         spin_lock(&ma->mca_lock);
1394                         if (del_timer(&ma->mca_timer))
1395                                 atomic_dec(&ma->mca_refcnt);
1396                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1397                         spin_unlock(&ma->mca_lock);
1398                         break;
1399                 }
1400         }
1401         read_unlock_bh(&idev->lock);
1402         return 0;
1403 }
1404
1405 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1406                   int gdeleted, int sdeleted)
1407 {
1408         switch (type) {
1409         case MLD2_MODE_IS_INCLUDE:
1410         case MLD2_MODE_IS_EXCLUDE:
1411                 if (gdeleted || sdeleted)
1412                         return false;
1413                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1414                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1415                                 return true;
1416                         /* don't include if this source is excluded
1417                          * in all filters
1418                          */
1419                         if (psf->sf_count[MCAST_INCLUDE])
1420                                 return type == MLD2_MODE_IS_INCLUDE;
1421                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1422                                 psf->sf_count[MCAST_EXCLUDE];
1423                 }
1424                 return false;
1425         case MLD2_CHANGE_TO_INCLUDE:
1426                 if (gdeleted || sdeleted)
1427                         return false;
1428                 return psf->sf_count[MCAST_INCLUDE] != 0;
1429         case MLD2_CHANGE_TO_EXCLUDE:
1430                 if (gdeleted || sdeleted)
1431                         return false;
1432                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1433                     psf->sf_count[MCAST_INCLUDE])
1434                         return false;
1435                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1436                         psf->sf_count[MCAST_EXCLUDE];
1437         case MLD2_ALLOW_NEW_SOURCES:
1438                 if (gdeleted || !psf->sf_crcount)
1439                         return false;
1440                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1441         case MLD2_BLOCK_OLD_SOURCES:
1442                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1443                         return gdeleted || (psf->sf_crcount && sdeleted);
1444                 return psf->sf_crcount && !gdeleted && !sdeleted;
1445         }
1446         return false;
1447 }
1448
1449 static int
1450 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1451 {
1452         struct ip6_sf_list *psf;
1453         int scount = 0;
1454
1455         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1456                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1457                         continue;
1458                 scount++;
1459         }
1460         return scount;
1461 }
1462
1463 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1464                        struct net_device *dev,
1465                        const struct in6_addr *saddr,
1466                        const struct in6_addr *daddr,
1467                        int proto, int len)
1468 {
1469         struct ipv6hdr *hdr;
1470
1471         skb->protocol = htons(ETH_P_IPV6);
1472         skb->dev = dev;
1473
1474         skb_reset_network_header(skb);
1475         skb_put(skb, sizeof(struct ipv6hdr));
1476         hdr = ipv6_hdr(skb);
1477
1478         ip6_flow_hdr(hdr, 0, 0);
1479
1480         hdr->payload_len = htons(len);
1481         hdr->nexthdr = proto;
1482         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1483
1484         hdr->saddr = *saddr;
1485         hdr->daddr = *daddr;
1486 }
1487
1488 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1489 {
1490         struct net_device *dev = idev->dev;
1491         struct net *net = dev_net(dev);
1492         struct sock *sk = net->ipv6.igmp_sk;
1493         struct sk_buff *skb;
1494         struct mld2_report *pmr;
1495         struct in6_addr addr_buf;
1496         const struct in6_addr *saddr;
1497         int hlen = LL_RESERVED_SPACE(dev);
1498         int tlen = dev->needed_tailroom;
1499         int err;
1500         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1501                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1502                      IPV6_TLV_PADN, 0 };
1503
1504         /* we assume size > sizeof(ra) here */
1505         size += hlen + tlen;
1506         /* limit our allocations to order-0 page */
1507         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1508         skb = sock_alloc_send_skb(sk, size, 1, &err);
1509
1510         if (!skb)
1511                 return NULL;
1512
1513         skb->priority = TC_PRIO_CONTROL;
1514         skb_reserve(skb, hlen);
1515
1516         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1517                 /* <draft-ietf-magma-mld-source-05.txt>:
1518                  * use unspecified address as the source address
1519                  * when a valid link-local address is not available.
1520                  */
1521                 saddr = &in6addr_any;
1522         } else
1523                 saddr = &addr_buf;
1524
1525         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1526
1527         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1528
1529         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1530         skb_put(skb, sizeof(*pmr));
1531         pmr = (struct mld2_report *)skb_transport_header(skb);
1532         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1533         pmr->mld2r_resv1 = 0;
1534         pmr->mld2r_cksum = 0;
1535         pmr->mld2r_resv2 = 0;
1536         pmr->mld2r_ngrec = 0;
1537         return skb;
1538 }
1539
1540 static void mld_sendpack(struct sk_buff *skb)
1541 {
1542         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1543         struct mld2_report *pmr =
1544                               (struct mld2_report *)skb_transport_header(skb);
1545         int payload_len, mldlen;
1546         struct inet6_dev *idev;
1547         struct net *net = dev_net(skb->dev);
1548         int err;
1549         struct flowi6 fl6;
1550         struct dst_entry *dst;
1551
1552         rcu_read_lock();
1553         idev = __in6_dev_get(skb->dev);
1554         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1555
1556         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1557                 sizeof(*pip6);
1558         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1559         pip6->payload_len = htons(payload_len);
1560
1561         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1562                                            IPPROTO_ICMPV6,
1563                                            csum_partial(skb_transport_header(skb),
1564                                                         mldlen, 0));
1565
1566         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1567                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1568                          skb->dev->ifindex);
1569         dst = icmp6_dst_alloc(skb->dev, &fl6);
1570
1571         err = 0;
1572         if (IS_ERR(dst)) {
1573                 err = PTR_ERR(dst);
1574                 dst = NULL;
1575         }
1576         skb_dst_set(skb, dst);
1577         if (err)
1578                 goto err_out;
1579
1580         payload_len = skb->len;
1581
1582         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1583                       dst_output);
1584 out:
1585         if (!err) {
1586                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1587                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1588                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1589         } else
1590                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1591
1592         rcu_read_unlock();
1593         return;
1594
1595 err_out:
1596         kfree_skb(skb);
1597         goto out;
1598 }
1599
1600 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1601 {
1602         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1603 }
1604
1605 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1606         int type, struct mld2_grec **ppgr)
1607 {
1608         struct net_device *dev = pmc->idev->dev;
1609         struct mld2_report *pmr;
1610         struct mld2_grec *pgr;
1611
1612         if (!skb)
1613                 skb = mld_newpack(pmc->idev, dev->mtu);
1614         if (!skb)
1615                 return NULL;
1616         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1617         pgr->grec_type = type;
1618         pgr->grec_auxwords = 0;
1619         pgr->grec_nsrcs = 0;
1620         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1621         pmr = (struct mld2_report *)skb_transport_header(skb);
1622         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1623         *ppgr = pgr;
1624         return skb;
1625 }
1626
1627 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1628         skb_tailroom(skb)) : 0)
1629
1630 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1631         int type, int gdeleted, int sdeleted)
1632 {
1633         struct inet6_dev *idev = pmc->idev;
1634         struct net_device *dev = idev->dev;
1635         struct mld2_report *pmr;
1636         struct mld2_grec *pgr = NULL;
1637         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1638         int scount, stotal, first, isquery, truncate;
1639
1640         if (pmc->mca_flags & MAF_NOREPORT)
1641                 return skb;
1642
1643         isquery = type == MLD2_MODE_IS_INCLUDE ||
1644                   type == MLD2_MODE_IS_EXCLUDE;
1645         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1646                     type == MLD2_CHANGE_TO_EXCLUDE;
1647
1648         stotal = scount = 0;
1649
1650         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1651
1652         if (!*psf_list)
1653                 goto empty_source;
1654
1655         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1656
1657         /* EX and TO_EX get a fresh packet, if needed */
1658         if (truncate) {
1659                 if (pmr && pmr->mld2r_ngrec &&
1660                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1661                         if (skb)
1662                                 mld_sendpack(skb);
1663                         skb = mld_newpack(idev, dev->mtu);
1664                 }
1665         }
1666         first = 1;
1667         psf_prev = NULL;
1668         for (psf=*psf_list; psf; psf=psf_next) {
1669                 struct in6_addr *psrc;
1670
1671                 psf_next = psf->sf_next;
1672
1673                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1674                         psf_prev = psf;
1675                         continue;
1676                 }
1677
1678                 /* clear marks on query responses */
1679                 if (isquery)
1680                         psf->sf_gsresp = 0;
1681
1682                 if (AVAILABLE(skb) < sizeof(*psrc) +
1683                     first*sizeof(struct mld2_grec)) {
1684                         if (truncate && !first)
1685                                 break;   /* truncate these */
1686                         if (pgr)
1687                                 pgr->grec_nsrcs = htons(scount);
1688                         if (skb)
1689                                 mld_sendpack(skb);
1690                         skb = mld_newpack(idev, dev->mtu);
1691                         first = 1;
1692                         scount = 0;
1693                 }
1694                 if (first) {
1695                         skb = add_grhead(skb, pmc, type, &pgr);
1696                         first = 0;
1697                 }
1698                 if (!skb)
1699                         return NULL;
1700                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1701                 *psrc = psf->sf_addr;
1702                 scount++; stotal++;
1703                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1704                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1705                         psf->sf_crcount--;
1706                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1707                                 if (psf_prev)
1708                                         psf_prev->sf_next = psf->sf_next;
1709                                 else
1710                                         *psf_list = psf->sf_next;
1711                                 kfree(psf);
1712                                 continue;
1713                         }
1714                 }
1715                 psf_prev = psf;
1716         }
1717
1718 empty_source:
1719         if (!stotal) {
1720                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1721                     type == MLD2_BLOCK_OLD_SOURCES)
1722                         return skb;
1723                 if (pmc->mca_crcount || isquery) {
1724                         /* make sure we have room for group header */
1725                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1726                                 mld_sendpack(skb);
1727                                 skb = NULL; /* add_grhead will get a new one */
1728                         }
1729                         skb = add_grhead(skb, pmc, type, &pgr);
1730                 }
1731         }
1732         if (pgr)
1733                 pgr->grec_nsrcs = htons(scount);
1734
1735         if (isquery)
1736                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1737         return skb;
1738 }
1739
1740 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1741 {
1742         struct sk_buff *skb = NULL;
1743         int type;
1744
1745         read_lock_bh(&idev->lock);
1746         if (!pmc) {
1747                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1748                         if (pmc->mca_flags & MAF_NOREPORT)
1749                                 continue;
1750                         spin_lock_bh(&pmc->mca_lock);
1751                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1752                                 type = MLD2_MODE_IS_EXCLUDE;
1753                         else
1754                                 type = MLD2_MODE_IS_INCLUDE;
1755                         skb = add_grec(skb, pmc, type, 0, 0);
1756                         spin_unlock_bh(&pmc->mca_lock);
1757                 }
1758         } else {
1759                 spin_lock_bh(&pmc->mca_lock);
1760                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1761                         type = MLD2_MODE_IS_EXCLUDE;
1762                 else
1763                         type = MLD2_MODE_IS_INCLUDE;
1764                 skb = add_grec(skb, pmc, type, 0, 0);
1765                 spin_unlock_bh(&pmc->mca_lock);
1766         }
1767         read_unlock_bh(&idev->lock);
1768         if (skb)
1769                 mld_sendpack(skb);
1770 }
1771
1772 /*
1773  * remove zero-count source records from a source filter list
1774  */
1775 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1776 {
1777         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1778
1779         psf_prev = NULL;
1780         for (psf=*ppsf; psf; psf = psf_next) {
1781                 psf_next = psf->sf_next;
1782                 if (psf->sf_crcount == 0) {
1783                         if (psf_prev)
1784                                 psf_prev->sf_next = psf->sf_next;
1785                         else
1786                                 *ppsf = psf->sf_next;
1787                         kfree(psf);
1788                 } else
1789                         psf_prev = psf;
1790         }
1791 }
1792
1793 static void mld_send_cr(struct inet6_dev *idev)
1794 {
1795         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1796         struct sk_buff *skb = NULL;
1797         int type, dtype;
1798
1799         read_lock_bh(&idev->lock);
1800         spin_lock(&idev->mc_lock);
1801
1802         /* deleted MCA's */
1803         pmc_prev = NULL;
1804         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1805                 pmc_next = pmc->next;
1806                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1807                         type = MLD2_BLOCK_OLD_SOURCES;
1808                         dtype = MLD2_BLOCK_OLD_SOURCES;
1809                         skb = add_grec(skb, pmc, type, 1, 0);
1810                         skb = add_grec(skb, pmc, dtype, 1, 1);
1811                 }
1812                 if (pmc->mca_crcount) {
1813                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1814                                 type = MLD2_CHANGE_TO_INCLUDE;
1815                                 skb = add_grec(skb, pmc, type, 1, 0);
1816                         }
1817                         pmc->mca_crcount--;
1818                         if (pmc->mca_crcount == 0) {
1819                                 mld_clear_zeros(&pmc->mca_tomb);
1820                                 mld_clear_zeros(&pmc->mca_sources);
1821                         }
1822                 }
1823                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1824                     !pmc->mca_sources) {
1825                         if (pmc_prev)
1826                                 pmc_prev->next = pmc_next;
1827                         else
1828                                 idev->mc_tomb = pmc_next;
1829                         in6_dev_put(pmc->idev);
1830                         kfree(pmc);
1831                 } else
1832                         pmc_prev = pmc;
1833         }
1834         spin_unlock(&idev->mc_lock);
1835
1836         /* change recs */
1837         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1838                 spin_lock_bh(&pmc->mca_lock);
1839                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1840                         type = MLD2_BLOCK_OLD_SOURCES;
1841                         dtype = MLD2_ALLOW_NEW_SOURCES;
1842                 } else {
1843                         type = MLD2_ALLOW_NEW_SOURCES;
1844                         dtype = MLD2_BLOCK_OLD_SOURCES;
1845                 }
1846                 skb = add_grec(skb, pmc, type, 0, 0);
1847                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1848
1849                 /* filter mode changes */
1850                 if (pmc->mca_crcount) {
1851                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1852                                 type = MLD2_CHANGE_TO_EXCLUDE;
1853                         else
1854                                 type = MLD2_CHANGE_TO_INCLUDE;
1855                         skb = add_grec(skb, pmc, type, 0, 0);
1856                         pmc->mca_crcount--;
1857                 }
1858                 spin_unlock_bh(&pmc->mca_lock);
1859         }
1860         read_unlock_bh(&idev->lock);
1861         if (!skb)
1862                 return;
1863         (void) mld_sendpack(skb);
1864 }
1865
1866 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1867 {
1868         struct net *net = dev_net(dev);
1869         struct sock *sk = net->ipv6.igmp_sk;
1870         struct inet6_dev *idev;
1871         struct sk_buff *skb;
1872         struct mld_msg *hdr;
1873         const struct in6_addr *snd_addr, *saddr;
1874         struct in6_addr addr_buf;
1875         int hlen = LL_RESERVED_SPACE(dev);
1876         int tlen = dev->needed_tailroom;
1877         int err, len, payload_len, full_len;
1878         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1879                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1880                      IPV6_TLV_PADN, 0 };
1881         struct flowi6 fl6;
1882         struct dst_entry *dst;
1883
1884         if (type == ICMPV6_MGM_REDUCTION)
1885                 snd_addr = &in6addr_linklocal_allrouters;
1886         else
1887                 snd_addr = addr;
1888
1889         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1890         payload_len = len + sizeof(ra);
1891         full_len = sizeof(struct ipv6hdr) + payload_len;
1892
1893         rcu_read_lock();
1894         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1895                       IPSTATS_MIB_OUT, full_len);
1896         rcu_read_unlock();
1897
1898         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1899
1900         if (skb == NULL) {
1901                 rcu_read_lock();
1902                 IP6_INC_STATS(net, __in6_dev_get(dev),
1903                               IPSTATS_MIB_OUTDISCARDS);
1904                 rcu_read_unlock();
1905                 return;
1906         }
1907         skb->priority = TC_PRIO_CONTROL;
1908         skb_reserve(skb, hlen);
1909
1910         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1911                 /* <draft-ietf-magma-mld-source-05.txt>:
1912                  * use unspecified address as the source address
1913                  * when a valid link-local address is not available.
1914                  */
1915                 saddr = &in6addr_any;
1916         } else
1917                 saddr = &addr_buf;
1918
1919         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1920
1921         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1922
1923         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1924         memset(hdr, 0, sizeof(struct mld_msg));
1925         hdr->mld_type = type;
1926         hdr->mld_mca = *addr;
1927
1928         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1929                                          IPPROTO_ICMPV6,
1930                                          csum_partial(hdr, len, 0));
1931
1932         rcu_read_lock();
1933         idev = __in6_dev_get(skb->dev);
1934
1935         icmpv6_flow_init(sk, &fl6, type,
1936                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1937                          skb->dev->ifindex);
1938         dst = icmp6_dst_alloc(skb->dev, &fl6);
1939         if (IS_ERR(dst)) {
1940                 err = PTR_ERR(dst);
1941                 goto err_out;
1942         }
1943
1944         skb_dst_set(skb, dst);
1945         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1946                       dst_output);
1947 out:
1948         if (!err) {
1949                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1950                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1951                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1952         } else
1953                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1954
1955         rcu_read_unlock();
1956         return;
1957
1958 err_out:
1959         kfree_skb(skb);
1960         goto out;
1961 }
1962
1963 static void mld_resend_report(struct inet6_dev *idev)
1964 {
1965         if (mld_in_v1_mode(idev)) {
1966                 struct ifmcaddr6 *mcaddr;
1967                 read_lock_bh(&idev->lock);
1968                 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) {
1969                         if (!(mcaddr->mca_flags & MAF_NOREPORT))
1970                                 igmp6_send(&mcaddr->mca_addr, idev->dev,
1971                                            ICMPV6_MGM_REPORT);
1972                 }
1973                 read_unlock_bh(&idev->lock);
1974         } else {
1975                 mld_send_report(idev, NULL);
1976         }
1977 }
1978
1979 void ipv6_mc_dad_complete(struct inet6_dev *idev)
1980 {
1981         idev->mc_dad_count = idev->mc_qrv;
1982         if (idev->mc_dad_count) {
1983                 mld_resend_report(idev);
1984                 idev->mc_dad_count--;
1985                 if (idev->mc_dad_count)
1986                         mld_dad_start_timer(idev, idev->mc_maxdelay);
1987         }
1988 }
1989
1990 static void mld_dad_timer_expire(unsigned long data)
1991 {
1992         struct inet6_dev *idev = (struct inet6_dev *)data;
1993
1994         mld_resend_report(idev);
1995         if (idev->mc_dad_count) {
1996                 idev->mc_dad_count--;
1997                 if (idev->mc_dad_count)
1998                         mld_dad_start_timer(idev, idev->mc_maxdelay);
1999         }
2000         __in6_dev_put(idev);
2001 }
2002
2003 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2004         const struct in6_addr *psfsrc)
2005 {
2006         struct ip6_sf_list *psf, *psf_prev;
2007         int rv = 0;
2008
2009         psf_prev = NULL;
2010         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2011                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2012                         break;
2013                 psf_prev = psf;
2014         }
2015         if (!psf || psf->sf_count[sfmode] == 0) {
2016                 /* source filter not found, or count wrong =>  bug */
2017                 return -ESRCH;
2018         }
2019         psf->sf_count[sfmode]--;
2020         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2021                 struct inet6_dev *idev = pmc->idev;
2022
2023                 /* no more filters for this source */
2024                 if (psf_prev)
2025                         psf_prev->sf_next = psf->sf_next;
2026                 else
2027                         pmc->mca_sources = psf->sf_next;
2028                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2029                     !mld_in_v1_mode(idev)) {
2030                         psf->sf_crcount = idev->mc_qrv;
2031                         psf->sf_next = pmc->mca_tomb;
2032                         pmc->mca_tomb = psf;
2033                         rv = 1;
2034                 } else
2035                         kfree(psf);
2036         }
2037         return rv;
2038 }
2039
2040 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2041                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2042                           int delta)
2043 {
2044         struct ifmcaddr6 *pmc;
2045         int     changerec = 0;
2046         int     i, err;
2047
2048         if (!idev)
2049                 return -ENODEV;
2050         read_lock_bh(&idev->lock);
2051         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2052                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2053                         break;
2054         }
2055         if (!pmc) {
2056                 /* MCA not found?? bug */
2057                 read_unlock_bh(&idev->lock);
2058                 return -ESRCH;
2059         }
2060         spin_lock_bh(&pmc->mca_lock);
2061         sf_markstate(pmc);
2062         if (!delta) {
2063                 if (!pmc->mca_sfcount[sfmode]) {
2064                         spin_unlock_bh(&pmc->mca_lock);
2065                         read_unlock_bh(&idev->lock);
2066                         return -EINVAL;
2067                 }
2068                 pmc->mca_sfcount[sfmode]--;
2069         }
2070         err = 0;
2071         for (i=0; i<sfcount; i++) {
2072                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2073
2074                 changerec |= rv > 0;
2075                 if (!err && rv < 0)
2076                         err = rv;
2077         }
2078         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2079             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2080             pmc->mca_sfcount[MCAST_INCLUDE]) {
2081                 struct ip6_sf_list *psf;
2082
2083                 /* filter mode change */
2084                 pmc->mca_sfmode = MCAST_INCLUDE;
2085                 pmc->mca_crcount = idev->mc_qrv;
2086                 idev->mc_ifc_count = pmc->mca_crcount;
2087                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2088                         psf->sf_crcount = 0;
2089                 mld_ifc_event(pmc->idev);
2090         } else if (sf_setstate(pmc) || changerec)
2091                 mld_ifc_event(pmc->idev);
2092         spin_unlock_bh(&pmc->mca_lock);
2093         read_unlock_bh(&idev->lock);
2094         return err;
2095 }
2096
2097 /*
2098  * Add multicast single-source filter to the interface list
2099  */
2100 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2101         const struct in6_addr *psfsrc)
2102 {
2103         struct ip6_sf_list *psf, *psf_prev;
2104
2105         psf_prev = NULL;
2106         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2107                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2108                         break;
2109                 psf_prev = psf;
2110         }
2111         if (!psf) {
2112                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2113                 if (!psf)
2114                         return -ENOBUFS;
2115
2116                 psf->sf_addr = *psfsrc;
2117                 if (psf_prev) {
2118                         psf_prev->sf_next = psf;
2119                 } else
2120                         pmc->mca_sources = psf;
2121         }
2122         psf->sf_count[sfmode]++;
2123         return 0;
2124 }
2125
2126 static void sf_markstate(struct ifmcaddr6 *pmc)
2127 {
2128         struct ip6_sf_list *psf;
2129         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2130
2131         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2132                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2133                         psf->sf_oldin = mca_xcount ==
2134                                 psf->sf_count[MCAST_EXCLUDE] &&
2135                                 !psf->sf_count[MCAST_INCLUDE];
2136                 } else
2137                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2138 }
2139
2140 static int sf_setstate(struct ifmcaddr6 *pmc)
2141 {
2142         struct ip6_sf_list *psf, *dpsf;
2143         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2144         int qrv = pmc->idev->mc_qrv;
2145         int new_in, rv;
2146
2147         rv = 0;
2148         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2149                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2150                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2151                                 !psf->sf_count[MCAST_INCLUDE];
2152                 } else
2153                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2154                 if (new_in) {
2155                         if (!psf->sf_oldin) {
2156                                 struct ip6_sf_list *prev = NULL;
2157
2158                                 for (dpsf=pmc->mca_tomb; dpsf;
2159                                      dpsf=dpsf->sf_next) {
2160                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2161                                             &psf->sf_addr))
2162                                                 break;
2163                                         prev = dpsf;
2164                                 }
2165                                 if (dpsf) {
2166                                         if (prev)
2167                                                 prev->sf_next = dpsf->sf_next;
2168                                         else
2169                                                 pmc->mca_tomb = dpsf->sf_next;
2170                                         kfree(dpsf);
2171                                 }
2172                                 psf->sf_crcount = qrv;
2173                                 rv++;
2174                         }
2175                 } else if (psf->sf_oldin) {
2176                         psf->sf_crcount = 0;
2177                         /*
2178                          * add or update "delete" records if an active filter
2179                          * is now inactive
2180                          */
2181                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2182                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2183                                     &psf->sf_addr))
2184                                         break;
2185                         if (!dpsf) {
2186                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2187                                 if (!dpsf)
2188                                         continue;
2189                                 *dpsf = *psf;
2190                                 /* pmc->mca_lock held by callers */
2191                                 dpsf->sf_next = pmc->mca_tomb;
2192                                 pmc->mca_tomb = dpsf;
2193                         }
2194                         dpsf->sf_crcount = qrv;
2195                         rv++;
2196                 }
2197         }
2198         return rv;
2199 }
2200
2201 /*
2202  * Add multicast source filter list to the interface list
2203  */
2204 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2205                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2206                           int delta)
2207 {
2208         struct ifmcaddr6 *pmc;
2209         int     isexclude;
2210         int     i, err;
2211
2212         if (!idev)
2213                 return -ENODEV;
2214         read_lock_bh(&idev->lock);
2215         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2216                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2217                         break;
2218         }
2219         if (!pmc) {
2220                 /* MCA not found?? bug */
2221                 read_unlock_bh(&idev->lock);
2222                 return -ESRCH;
2223         }
2224         spin_lock_bh(&pmc->mca_lock);
2225
2226         sf_markstate(pmc);
2227         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2228         if (!delta)
2229                 pmc->mca_sfcount[sfmode]++;
2230         err = 0;
2231         for (i=0; i<sfcount; i++) {
2232                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2233                 if (err)
2234                         break;
2235         }
2236         if (err) {
2237                 int j;
2238
2239                 if (!delta)
2240                         pmc->mca_sfcount[sfmode]--;
2241                 for (j=0; j<i; j++)
2242                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2243         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2244                 struct ip6_sf_list *psf;
2245
2246                 /* filter mode change */
2247                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2248                         pmc->mca_sfmode = MCAST_EXCLUDE;
2249                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2250                         pmc->mca_sfmode = MCAST_INCLUDE;
2251                 /* else no filters; keep old mode for reports */
2252
2253                 pmc->mca_crcount = idev->mc_qrv;
2254                 idev->mc_ifc_count = pmc->mca_crcount;
2255                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2256                         psf->sf_crcount = 0;
2257                 mld_ifc_event(idev);
2258         } else if (sf_setstate(pmc))
2259                 mld_ifc_event(idev);
2260         spin_unlock_bh(&pmc->mca_lock);
2261         read_unlock_bh(&idev->lock);
2262         return err;
2263 }
2264
2265 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2266 {
2267         struct ip6_sf_list *psf, *nextpsf;
2268
2269         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2270                 nextpsf = psf->sf_next;
2271                 kfree(psf);
2272         }
2273         pmc->mca_tomb = NULL;
2274         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2275                 nextpsf = psf->sf_next;
2276                 kfree(psf);
2277         }
2278         pmc->mca_sources = NULL;
2279         pmc->mca_sfmode = MCAST_EXCLUDE;
2280         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2281         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2282 }
2283
2284
2285 static void igmp6_join_group(struct ifmcaddr6 *ma)
2286 {
2287         unsigned long delay;
2288
2289         if (ma->mca_flags & MAF_NOREPORT)
2290                 return;
2291
2292         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2293
2294         delay = net_random() % unsolicited_report_interval(ma->idev);
2295
2296         spin_lock_bh(&ma->mca_lock);
2297         if (del_timer(&ma->mca_timer)) {
2298                 atomic_dec(&ma->mca_refcnt);
2299                 delay = ma->mca_timer.expires - jiffies;
2300         }
2301
2302         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2303                 atomic_inc(&ma->mca_refcnt);
2304         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2305         spin_unlock_bh(&ma->mca_lock);
2306 }
2307
2308 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2309                             struct inet6_dev *idev)
2310 {
2311         int err;
2312
2313         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2314          * so no other readers or writers of iml or its sflist
2315          */
2316         if (!iml->sflist) {
2317                 /* any-source empty exclude case */
2318                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2319         }
2320         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2321                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2322         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2323         iml->sflist = NULL;
2324         return err;
2325 }
2326
2327 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2328 {
2329         if (mld_in_v1_mode(ma->idev)) {
2330                 if (ma->mca_flags & MAF_LAST_REPORTER)
2331                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2332                                 ICMPV6_MGM_REDUCTION);
2333         } else {
2334                 mld_add_delrec(ma->idev, ma);
2335                 mld_ifc_event(ma->idev);
2336         }
2337 }
2338
2339 static void mld_gq_timer_expire(unsigned long data)
2340 {
2341         struct inet6_dev *idev = (struct inet6_dev *)data;
2342
2343         idev->mc_gq_running = 0;
2344         mld_send_report(idev, NULL);
2345         __in6_dev_put(idev);
2346 }
2347
2348 static void mld_ifc_timer_expire(unsigned long data)
2349 {
2350         struct inet6_dev *idev = (struct inet6_dev *)data;
2351
2352         mld_send_cr(idev);
2353         if (idev->mc_ifc_count) {
2354                 idev->mc_ifc_count--;
2355                 if (idev->mc_ifc_count)
2356                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2357         }
2358         __in6_dev_put(idev);
2359 }
2360
2361 static void mld_ifc_event(struct inet6_dev *idev)
2362 {
2363         if (mld_in_v1_mode(idev))
2364                 return;
2365         idev->mc_ifc_count = idev->mc_qrv;
2366         mld_ifc_start_timer(idev, 1);
2367 }
2368
2369
2370 static void igmp6_timer_handler(unsigned long data)
2371 {
2372         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2373
2374         if (mld_in_v1_mode(ma->idev))
2375                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2376         else
2377                 mld_send_report(ma->idev, ma);
2378
2379         spin_lock(&ma->mca_lock);
2380         ma->mca_flags |=  MAF_LAST_REPORTER;
2381         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2382         spin_unlock(&ma->mca_lock);
2383         ma_put(ma);
2384 }
2385
2386 /* Device changing type */
2387
2388 void ipv6_mc_unmap(struct inet6_dev *idev)
2389 {
2390         struct ifmcaddr6 *i;
2391
2392         /* Install multicast list, except for all-nodes (already installed) */
2393
2394         read_lock_bh(&idev->lock);
2395         for (i = idev->mc_list; i; i = i->next)
2396                 igmp6_group_dropped(i);
2397         read_unlock_bh(&idev->lock);
2398 }
2399
2400 void ipv6_mc_remap(struct inet6_dev *idev)
2401 {
2402         ipv6_mc_up(idev);
2403 }
2404
2405 /* Device going down */
2406
2407 void ipv6_mc_down(struct inet6_dev *idev)
2408 {
2409         struct ifmcaddr6 *i;
2410
2411         /* Withdraw multicast list */
2412
2413         read_lock_bh(&idev->lock);
2414         idev->mc_ifc_count = 0;
2415         if (del_timer(&idev->mc_ifc_timer))
2416                 __in6_dev_put(idev);
2417         idev->mc_gq_running = 0;
2418         if (del_timer(&idev->mc_gq_timer))
2419                 __in6_dev_put(idev);
2420         if (del_timer(&idev->mc_dad_timer))
2421                 __in6_dev_put(idev);
2422
2423         for (i = idev->mc_list; i; i=i->next)
2424                 igmp6_group_dropped(i);
2425         read_unlock_bh(&idev->lock);
2426
2427         mld_clear_delrec(idev);
2428 }
2429
2430
2431 /* Device going up */
2432
2433 void ipv6_mc_up(struct inet6_dev *idev)
2434 {
2435         struct ifmcaddr6 *i;
2436
2437         /* Install multicast list, except for all-nodes (already installed) */
2438
2439         read_lock_bh(&idev->lock);
2440         for (i = idev->mc_list; i; i=i->next)
2441                 igmp6_group_added(i);
2442         read_unlock_bh(&idev->lock);
2443 }
2444
2445 /* IPv6 device initialization. */
2446
2447 void ipv6_mc_init_dev(struct inet6_dev *idev)
2448 {
2449         write_lock_bh(&idev->lock);
2450         spin_lock_init(&idev->mc_lock);
2451         idev->mc_gq_running = 0;
2452         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2453                         (unsigned long)idev);
2454         idev->mc_tomb = NULL;
2455         idev->mc_ifc_count = 0;
2456         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2457                         (unsigned long)idev);
2458         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2459                     (unsigned long)idev);
2460
2461         idev->mc_qrv = MLD_QRV_DEFAULT;
2462         idev->mc_qi = MLD_QI_DEFAULT;
2463         idev->mc_qri = MLD_QRI_DEFAULT;
2464
2465         idev->mc_maxdelay = unsolicited_report_interval(idev);
2466         idev->mc_v1_seen = 0;
2467         write_unlock_bh(&idev->lock);
2468 }
2469
2470 /*
2471  *      Device is about to be destroyed: clean up.
2472  */
2473
2474 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2475 {
2476         struct ifmcaddr6 *i;
2477
2478         /* Deactivate timers */
2479         ipv6_mc_down(idev);
2480
2481         /* Delete all-nodes address. */
2482         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2483          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2484          * fail.
2485          */
2486         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2487
2488         if (idev->cnf.forwarding)
2489                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2490
2491         write_lock_bh(&idev->lock);
2492         while ((i = idev->mc_list) != NULL) {
2493                 idev->mc_list = i->next;
2494                 write_unlock_bh(&idev->lock);
2495
2496                 igmp6_group_dropped(i);
2497                 ma_put(i);
2498
2499                 write_lock_bh(&idev->lock);
2500         }
2501         write_unlock_bh(&idev->lock);
2502 }
2503
2504 #ifdef CONFIG_PROC_FS
2505 struct igmp6_mc_iter_state {
2506         struct seq_net_private p;
2507         struct net_device *dev;
2508         struct inet6_dev *idev;
2509 };
2510
2511 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2512
2513 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2514 {
2515         struct ifmcaddr6 *im = NULL;
2516         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2517         struct net *net = seq_file_net(seq);
2518
2519         state->idev = NULL;
2520         for_each_netdev_rcu(net, state->dev) {
2521                 struct inet6_dev *idev;
2522                 idev = __in6_dev_get(state->dev);
2523                 if (!idev)
2524                         continue;
2525                 read_lock_bh(&idev->lock);
2526                 im = idev->mc_list;
2527                 if (im) {
2528                         state->idev = idev;
2529                         break;
2530                 }
2531                 read_unlock_bh(&idev->lock);
2532         }
2533         return im;
2534 }
2535
2536 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2537 {
2538         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2539
2540         im = im->next;
2541         while (!im) {
2542                 if (likely(state->idev != NULL))
2543                         read_unlock_bh(&state->idev->lock);
2544
2545                 state->dev = next_net_device_rcu(state->dev);
2546                 if (!state->dev) {
2547                         state->idev = NULL;
2548                         break;
2549                 }
2550                 state->idev = __in6_dev_get(state->dev);
2551                 if (!state->idev)
2552                         continue;
2553                 read_lock_bh(&state->idev->lock);
2554                 im = state->idev->mc_list;
2555         }
2556         return im;
2557 }
2558
2559 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2560 {
2561         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2562         if (im)
2563                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2564                         --pos;
2565         return pos ? NULL : im;
2566 }
2567
2568 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2569         __acquires(RCU)
2570 {
2571         rcu_read_lock();
2572         return igmp6_mc_get_idx(seq, *pos);
2573 }
2574
2575 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2576 {
2577         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2578
2579         ++*pos;
2580         return im;
2581 }
2582
2583 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2584         __releases(RCU)
2585 {
2586         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2587
2588         if (likely(state->idev != NULL)) {
2589                 read_unlock_bh(&state->idev->lock);
2590                 state->idev = NULL;
2591         }
2592         state->dev = NULL;
2593         rcu_read_unlock();
2594 }
2595
2596 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2597 {
2598         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2599         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2600
2601         seq_printf(seq,
2602                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2603                    state->dev->ifindex, state->dev->name,
2604                    &im->mca_addr,
2605                    im->mca_users, im->mca_flags,
2606                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2607                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2608         return 0;
2609 }
2610
2611 static const struct seq_operations igmp6_mc_seq_ops = {
2612         .start  =       igmp6_mc_seq_start,
2613         .next   =       igmp6_mc_seq_next,
2614         .stop   =       igmp6_mc_seq_stop,
2615         .show   =       igmp6_mc_seq_show,
2616 };
2617
2618 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2619 {
2620         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2621                             sizeof(struct igmp6_mc_iter_state));
2622 }
2623
2624 static const struct file_operations igmp6_mc_seq_fops = {
2625         .owner          =       THIS_MODULE,
2626         .open           =       igmp6_mc_seq_open,
2627         .read           =       seq_read,
2628         .llseek         =       seq_lseek,
2629         .release        =       seq_release_net,
2630 };
2631
2632 struct igmp6_mcf_iter_state {
2633         struct seq_net_private p;
2634         struct net_device *dev;
2635         struct inet6_dev *idev;
2636         struct ifmcaddr6 *im;
2637 };
2638
2639 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2640
2641 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2642 {
2643         struct ip6_sf_list *psf = NULL;
2644         struct ifmcaddr6 *im = NULL;
2645         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2646         struct net *net = seq_file_net(seq);
2647
2648         state->idev = NULL;
2649         state->im = NULL;
2650         for_each_netdev_rcu(net, state->dev) {
2651                 struct inet6_dev *idev;
2652                 idev = __in6_dev_get(state->dev);
2653                 if (unlikely(idev == NULL))
2654                         continue;
2655                 read_lock_bh(&idev->lock);
2656                 im = idev->mc_list;
2657                 if (likely(im != NULL)) {
2658                         spin_lock_bh(&im->mca_lock);
2659                         psf = im->mca_sources;
2660                         if (likely(psf != NULL)) {
2661                                 state->im = im;
2662                                 state->idev = idev;
2663                                 break;
2664                         }
2665                         spin_unlock_bh(&im->mca_lock);
2666                 }
2667                 read_unlock_bh(&idev->lock);
2668         }
2669         return psf;
2670 }
2671
2672 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2673 {
2674         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2675
2676         psf = psf->sf_next;
2677         while (!psf) {
2678                 spin_unlock_bh(&state->im->mca_lock);
2679                 state->im = state->im->next;
2680                 while (!state->im) {
2681                         if (likely(state->idev != NULL))
2682                                 read_unlock_bh(&state->idev->lock);
2683
2684                         state->dev = next_net_device_rcu(state->dev);
2685                         if (!state->dev) {
2686                                 state->idev = NULL;
2687                                 goto out;
2688                         }
2689                         state->idev = __in6_dev_get(state->dev);
2690                         if (!state->idev)
2691                                 continue;
2692                         read_lock_bh(&state->idev->lock);
2693                         state->im = state->idev->mc_list;
2694                 }
2695                 if (!state->im)
2696                         break;
2697                 spin_lock_bh(&state->im->mca_lock);
2698                 psf = state->im->mca_sources;
2699         }
2700 out:
2701         return psf;
2702 }
2703
2704 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2705 {
2706         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2707         if (psf)
2708                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2709                         --pos;
2710         return pos ? NULL : psf;
2711 }
2712
2713 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2714         __acquires(RCU)
2715 {
2716         rcu_read_lock();
2717         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2718 }
2719
2720 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2721 {
2722         struct ip6_sf_list *psf;
2723         if (v == SEQ_START_TOKEN)
2724                 psf = igmp6_mcf_get_first(seq);
2725         else
2726                 psf = igmp6_mcf_get_next(seq, v);
2727         ++*pos;
2728         return psf;
2729 }
2730
2731 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2732         __releases(RCU)
2733 {
2734         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2735         if (likely(state->im != NULL)) {
2736                 spin_unlock_bh(&state->im->mca_lock);
2737                 state->im = NULL;
2738         }
2739         if (likely(state->idev != NULL)) {
2740                 read_unlock_bh(&state->idev->lock);
2741                 state->idev = NULL;
2742         }
2743         state->dev = NULL;
2744         rcu_read_unlock();
2745 }
2746
2747 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2748 {
2749         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2750         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2751
2752         if (v == SEQ_START_TOKEN) {
2753                 seq_printf(seq,
2754                            "%3s %6s "
2755                            "%32s %32s %6s %6s\n", "Idx",
2756                            "Device", "Multicast Address",
2757                            "Source Address", "INC", "EXC");
2758         } else {
2759                 seq_printf(seq,
2760                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2761                            state->dev->ifindex, state->dev->name,
2762                            &state->im->mca_addr,
2763                            &psf->sf_addr,
2764                            psf->sf_count[MCAST_INCLUDE],
2765                            psf->sf_count[MCAST_EXCLUDE]);
2766         }
2767         return 0;
2768 }
2769
2770 static const struct seq_operations igmp6_mcf_seq_ops = {
2771         .start  =       igmp6_mcf_seq_start,
2772         .next   =       igmp6_mcf_seq_next,
2773         .stop   =       igmp6_mcf_seq_stop,
2774         .show   =       igmp6_mcf_seq_show,
2775 };
2776
2777 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2778 {
2779         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2780                             sizeof(struct igmp6_mcf_iter_state));
2781 }
2782
2783 static const struct file_operations igmp6_mcf_seq_fops = {
2784         .owner          =       THIS_MODULE,
2785         .open           =       igmp6_mcf_seq_open,
2786         .read           =       seq_read,
2787         .llseek         =       seq_lseek,
2788         .release        =       seq_release_net,
2789 };
2790
2791 static int __net_init igmp6_proc_init(struct net *net)
2792 {
2793         int err;
2794
2795         err = -ENOMEM;
2796         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2797                 goto out;
2798         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2799                          &igmp6_mcf_seq_fops))
2800                 goto out_proc_net_igmp6;
2801
2802         err = 0;
2803 out:
2804         return err;
2805
2806 out_proc_net_igmp6:
2807         remove_proc_entry("igmp6", net->proc_net);
2808         goto out;
2809 }
2810
2811 static void __net_exit igmp6_proc_exit(struct net *net)
2812 {
2813         remove_proc_entry("mcfilter6", net->proc_net);
2814         remove_proc_entry("igmp6", net->proc_net);
2815 }
2816 #else
2817 static inline int igmp6_proc_init(struct net *net)
2818 {
2819         return 0;
2820 }
2821 static inline void igmp6_proc_exit(struct net *net)
2822 {
2823 }
2824 #endif
2825
2826 static int __net_init igmp6_net_init(struct net *net)
2827 {
2828         int err;
2829
2830         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2831                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2832         if (err < 0) {
2833                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2834                        err);
2835                 goto out;
2836         }
2837
2838         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2839
2840         err = igmp6_proc_init(net);
2841         if (err)
2842                 goto out_sock_create;
2843 out:
2844         return err;
2845
2846 out_sock_create:
2847         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2848         goto out;
2849 }
2850
2851 static void __net_exit igmp6_net_exit(struct net *net)
2852 {
2853         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2854         igmp6_proc_exit(net);
2855 }
2856
2857 static struct pernet_operations igmp6_net_ops = {
2858         .init = igmp6_net_init,
2859         .exit = igmp6_net_exit,
2860 };
2861
2862 int __init igmp6_init(void)
2863 {
2864         return register_pernet_subsys(&igmp6_net_ops);
2865 }
2866
2867 void igmp6_cleanup(void)
2868 {
2869         unregister_pernet_subsys(&igmp6_net_ops);
2870 }