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 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1222                           unsigned long *max_delay)
1223 {
1224         unsigned long mldv1_md;
1225
1226         /* Ignore v1 queries */
1227         if (mld_in_v2_mode_only(idev))
1228                 return -EINVAL;
1229
1230         /* MLDv1 router present */
1231         mldv1_md = ntohs(mld->mld_maxdelay);
1232         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1233
1234         mld_set_v1_mode(idev);
1235
1236         /* cancel MLDv2 report timer */
1237         idev->mc_gq_running = 0;
1238         if (del_timer(&idev->mc_gq_timer))
1239                 __in6_dev_put(idev);
1240
1241         /* cancel the interface change timer */
1242         idev->mc_ifc_count = 0;
1243         if (del_timer(&idev->mc_ifc_timer))
1244                 __in6_dev_put(idev);
1245
1246         /* clear deleted report items */
1247         mld_clear_delrec(idev);
1248
1249         return 0;
1250 }
1251
1252 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1253                           unsigned long *max_delay)
1254 {
1255         /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
1256         if (mld_in_v1_mode(idev))
1257                 return -EINVAL;
1258
1259         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1260
1261         mld_update_qrv(idev, mld);
1262         mld_update_qi(idev, mld);
1263         mld_update_qri(idev, mld);
1264
1265         idev->mc_maxdelay = *max_delay;
1266
1267         return 0;
1268 }
1269
1270 /* called with rcu_read_lock() */
1271 int igmp6_event_query(struct sk_buff *skb)
1272 {
1273         struct mld2_query *mlh2 = NULL;
1274         struct ifmcaddr6 *ma;
1275         const struct in6_addr *group;
1276         unsigned long max_delay;
1277         struct inet6_dev *idev;
1278         struct mld_msg *mld;
1279         int group_type;
1280         int mark = 0;
1281         int len, err;
1282
1283         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1284                 return -EINVAL;
1285
1286         /* compute payload length excluding extension headers */
1287         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1288         len -= skb_network_header_len(skb);
1289
1290         /* Drop queries with not link local source */
1291         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1292                 return -EINVAL;
1293
1294         idev = __in6_dev_get(skb->dev);
1295         if (idev == NULL)
1296                 return 0;
1297
1298         mld = (struct mld_msg *)icmp6_hdr(skb);
1299         group = &mld->mld_mca;
1300         group_type = ipv6_addr_type(group);
1301
1302         if (group_type != IPV6_ADDR_ANY &&
1303             !(group_type&IPV6_ADDR_MULTICAST))
1304                 return -EINVAL;
1305
1306         if (len == MLD_V1_QUERY_LEN) {
1307                 err = mld_process_v1(idev, mld, &max_delay);
1308                 if (err < 0)
1309                         return err;
1310         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1311                 int srcs_offset = sizeof(struct mld2_query) -
1312                                   sizeof(struct icmp6hdr);
1313
1314                 if (!pskb_may_pull(skb, srcs_offset))
1315                         return -EINVAL;
1316
1317                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1318
1319                 err = mld_process_v2(idev, mlh2, &max_delay);
1320                 if (err < 0)
1321                         return err;
1322
1323                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1324                         if (mlh2->mld2q_nsrcs)
1325                                 return -EINVAL; /* no sources allowed */
1326
1327                         mld_gq_start_timer(idev);
1328                         return 0;
1329                 }
1330                 /* mark sources to include, if group & source-specific */
1331                 if (mlh2->mld2q_nsrcs != 0) {
1332                         if (!pskb_may_pull(skb, srcs_offset +
1333                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1334                                 return -EINVAL;
1335
1336                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1337                         mark = 1;
1338                 }
1339         } else
1340                 return -EINVAL;
1341
1342         read_lock_bh(&idev->lock);
1343         if (group_type == IPV6_ADDR_ANY) {
1344                 for (ma = idev->mc_list; ma; ma=ma->next) {
1345                         spin_lock_bh(&ma->mca_lock);
1346                         igmp6_group_queried(ma, max_delay);
1347                         spin_unlock_bh(&ma->mca_lock);
1348                 }
1349         } else {
1350                 for (ma = idev->mc_list; ma; ma=ma->next) {
1351                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1352                                 continue;
1353                         spin_lock_bh(&ma->mca_lock);
1354                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1355                                 /* gsquery <- gsquery && mark */
1356                                 if (!mark)
1357                                         ma->mca_flags &= ~MAF_GSQUERY;
1358                         } else {
1359                                 /* gsquery <- mark */
1360                                 if (mark)
1361                                         ma->mca_flags |= MAF_GSQUERY;
1362                                 else
1363                                         ma->mca_flags &= ~MAF_GSQUERY;
1364                         }
1365                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1366                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1367                                 igmp6_group_queried(ma, max_delay);
1368                         spin_unlock_bh(&ma->mca_lock);
1369                         break;
1370                 }
1371         }
1372         read_unlock_bh(&idev->lock);
1373
1374         return 0;
1375 }
1376
1377 /* called with rcu_read_lock() */
1378 int igmp6_event_report(struct sk_buff *skb)
1379 {
1380         struct ifmcaddr6 *ma;
1381         struct inet6_dev *idev;
1382         struct mld_msg *mld;
1383         int addr_type;
1384
1385         /* Our own report looped back. Ignore it. */
1386         if (skb->pkt_type == PACKET_LOOPBACK)
1387                 return 0;
1388
1389         /* send our report if the MC router may not have heard this report */
1390         if (skb->pkt_type != PACKET_MULTICAST &&
1391             skb->pkt_type != PACKET_BROADCAST)
1392                 return 0;
1393
1394         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1395                 return -EINVAL;
1396
1397         mld = (struct mld_msg *)icmp6_hdr(skb);
1398
1399         /* Drop reports with not link local source */
1400         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1401         if (addr_type != IPV6_ADDR_ANY &&
1402             !(addr_type&IPV6_ADDR_LINKLOCAL))
1403                 return -EINVAL;
1404
1405         idev = __in6_dev_get(skb->dev);
1406         if (idev == NULL)
1407                 return -ENODEV;
1408
1409         /*
1410          *      Cancel the timer for this group
1411          */
1412
1413         read_lock_bh(&idev->lock);
1414         for (ma = idev->mc_list; ma; ma=ma->next) {
1415                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1416                         spin_lock(&ma->mca_lock);
1417                         if (del_timer(&ma->mca_timer))
1418                                 atomic_dec(&ma->mca_refcnt);
1419                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1420                         spin_unlock(&ma->mca_lock);
1421                         break;
1422                 }
1423         }
1424         read_unlock_bh(&idev->lock);
1425         return 0;
1426 }
1427
1428 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1429                   int gdeleted, int sdeleted)
1430 {
1431         switch (type) {
1432         case MLD2_MODE_IS_INCLUDE:
1433         case MLD2_MODE_IS_EXCLUDE:
1434                 if (gdeleted || sdeleted)
1435                         return false;
1436                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1437                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1438                                 return true;
1439                         /* don't include if this source is excluded
1440                          * in all filters
1441                          */
1442                         if (psf->sf_count[MCAST_INCLUDE])
1443                                 return type == MLD2_MODE_IS_INCLUDE;
1444                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1445                                 psf->sf_count[MCAST_EXCLUDE];
1446                 }
1447                 return false;
1448         case MLD2_CHANGE_TO_INCLUDE:
1449                 if (gdeleted || sdeleted)
1450                         return false;
1451                 return psf->sf_count[MCAST_INCLUDE] != 0;
1452         case MLD2_CHANGE_TO_EXCLUDE:
1453                 if (gdeleted || sdeleted)
1454                         return false;
1455                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1456                     psf->sf_count[MCAST_INCLUDE])
1457                         return false;
1458                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1459                         psf->sf_count[MCAST_EXCLUDE];
1460         case MLD2_ALLOW_NEW_SOURCES:
1461                 if (gdeleted || !psf->sf_crcount)
1462                         return false;
1463                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1464         case MLD2_BLOCK_OLD_SOURCES:
1465                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1466                         return gdeleted || (psf->sf_crcount && sdeleted);
1467                 return psf->sf_crcount && !gdeleted && !sdeleted;
1468         }
1469         return false;
1470 }
1471
1472 static int
1473 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1474 {
1475         struct ip6_sf_list *psf;
1476         int scount = 0;
1477
1478         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1479                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1480                         continue;
1481                 scount++;
1482         }
1483         return scount;
1484 }
1485
1486 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1487                        struct net_device *dev,
1488                        const struct in6_addr *saddr,
1489                        const struct in6_addr *daddr,
1490                        int proto, int len)
1491 {
1492         struct ipv6hdr *hdr;
1493
1494         skb->protocol = htons(ETH_P_IPV6);
1495         skb->dev = dev;
1496
1497         skb_reset_network_header(skb);
1498         skb_put(skb, sizeof(struct ipv6hdr));
1499         hdr = ipv6_hdr(skb);
1500
1501         ip6_flow_hdr(hdr, 0, 0);
1502
1503         hdr->payload_len = htons(len);
1504         hdr->nexthdr = proto;
1505         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1506
1507         hdr->saddr = *saddr;
1508         hdr->daddr = *daddr;
1509 }
1510
1511 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1512 {
1513         struct net_device *dev = idev->dev;
1514         struct net *net = dev_net(dev);
1515         struct sock *sk = net->ipv6.igmp_sk;
1516         struct sk_buff *skb;
1517         struct mld2_report *pmr;
1518         struct in6_addr addr_buf;
1519         const struct in6_addr *saddr;
1520         int hlen = LL_RESERVED_SPACE(dev);
1521         int tlen = dev->needed_tailroom;
1522         int err;
1523         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1524                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1525                      IPV6_TLV_PADN, 0 };
1526
1527         /* we assume size > sizeof(ra) here */
1528         size += hlen + tlen;
1529         /* limit our allocations to order-0 page */
1530         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1531         skb = sock_alloc_send_skb(sk, size, 1, &err);
1532
1533         if (!skb)
1534                 return NULL;
1535
1536         skb->priority = TC_PRIO_CONTROL;
1537         skb_reserve(skb, hlen);
1538
1539         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1540                 /* <draft-ietf-magma-mld-source-05.txt>:
1541                  * use unspecified address as the source address
1542                  * when a valid link-local address is not available.
1543                  */
1544                 saddr = &in6addr_any;
1545         } else
1546                 saddr = &addr_buf;
1547
1548         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1549
1550         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1551
1552         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1553         skb_put(skb, sizeof(*pmr));
1554         pmr = (struct mld2_report *)skb_transport_header(skb);
1555         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1556         pmr->mld2r_resv1 = 0;
1557         pmr->mld2r_cksum = 0;
1558         pmr->mld2r_resv2 = 0;
1559         pmr->mld2r_ngrec = 0;
1560         return skb;
1561 }
1562
1563 static void mld_sendpack(struct sk_buff *skb)
1564 {
1565         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1566         struct mld2_report *pmr =
1567                               (struct mld2_report *)skb_transport_header(skb);
1568         int payload_len, mldlen;
1569         struct inet6_dev *idev;
1570         struct net *net = dev_net(skb->dev);
1571         int err;
1572         struct flowi6 fl6;
1573         struct dst_entry *dst;
1574
1575         rcu_read_lock();
1576         idev = __in6_dev_get(skb->dev);
1577         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1578
1579         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1580                 sizeof(*pip6);
1581         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1582         pip6->payload_len = htons(payload_len);
1583
1584         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1585                                            IPPROTO_ICMPV6,
1586                                            csum_partial(skb_transport_header(skb),
1587                                                         mldlen, 0));
1588
1589         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1590                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1591                          skb->dev->ifindex);
1592         dst = icmp6_dst_alloc(skb->dev, &fl6);
1593
1594         err = 0;
1595         if (IS_ERR(dst)) {
1596                 err = PTR_ERR(dst);
1597                 dst = NULL;
1598         }
1599         skb_dst_set(skb, dst);
1600         if (err)
1601                 goto err_out;
1602
1603         payload_len = skb->len;
1604
1605         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1606                       dst_output);
1607 out:
1608         if (!err) {
1609                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1610                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1611                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1612         } else
1613                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1614
1615         rcu_read_unlock();
1616         return;
1617
1618 err_out:
1619         kfree_skb(skb);
1620         goto out;
1621 }
1622
1623 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1624 {
1625         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1626 }
1627
1628 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1629         int type, struct mld2_grec **ppgr)
1630 {
1631         struct net_device *dev = pmc->idev->dev;
1632         struct mld2_report *pmr;
1633         struct mld2_grec *pgr;
1634
1635         if (!skb)
1636                 skb = mld_newpack(pmc->idev, dev->mtu);
1637         if (!skb)
1638                 return NULL;
1639         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1640         pgr->grec_type = type;
1641         pgr->grec_auxwords = 0;
1642         pgr->grec_nsrcs = 0;
1643         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1644         pmr = (struct mld2_report *)skb_transport_header(skb);
1645         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1646         *ppgr = pgr;
1647         return skb;
1648 }
1649
1650 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1651         skb_tailroom(skb)) : 0)
1652
1653 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1654         int type, int gdeleted, int sdeleted)
1655 {
1656         struct inet6_dev *idev = pmc->idev;
1657         struct net_device *dev = idev->dev;
1658         struct mld2_report *pmr;
1659         struct mld2_grec *pgr = NULL;
1660         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1661         int scount, stotal, first, isquery, truncate;
1662
1663         if (pmc->mca_flags & MAF_NOREPORT)
1664                 return skb;
1665
1666         isquery = type == MLD2_MODE_IS_INCLUDE ||
1667                   type == MLD2_MODE_IS_EXCLUDE;
1668         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1669                     type == MLD2_CHANGE_TO_EXCLUDE;
1670
1671         stotal = scount = 0;
1672
1673         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1674
1675         if (!*psf_list)
1676                 goto empty_source;
1677
1678         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1679
1680         /* EX and TO_EX get a fresh packet, if needed */
1681         if (truncate) {
1682                 if (pmr && pmr->mld2r_ngrec &&
1683                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1684                         if (skb)
1685                                 mld_sendpack(skb);
1686                         skb = mld_newpack(idev, dev->mtu);
1687                 }
1688         }
1689         first = 1;
1690         psf_prev = NULL;
1691         for (psf=*psf_list; psf; psf=psf_next) {
1692                 struct in6_addr *psrc;
1693
1694                 psf_next = psf->sf_next;
1695
1696                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1697                         psf_prev = psf;
1698                         continue;
1699                 }
1700
1701                 /* clear marks on query responses */
1702                 if (isquery)
1703                         psf->sf_gsresp = 0;
1704
1705                 if (AVAILABLE(skb) < sizeof(*psrc) +
1706                     first*sizeof(struct mld2_grec)) {
1707                         if (truncate && !first)
1708                                 break;   /* truncate these */
1709                         if (pgr)
1710                                 pgr->grec_nsrcs = htons(scount);
1711                         if (skb)
1712                                 mld_sendpack(skb);
1713                         skb = mld_newpack(idev, dev->mtu);
1714                         first = 1;
1715                         scount = 0;
1716                 }
1717                 if (first) {
1718                         skb = add_grhead(skb, pmc, type, &pgr);
1719                         first = 0;
1720                 }
1721                 if (!skb)
1722                         return NULL;
1723                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1724                 *psrc = psf->sf_addr;
1725                 scount++; stotal++;
1726                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1727                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1728                         psf->sf_crcount--;
1729                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1730                                 if (psf_prev)
1731                                         psf_prev->sf_next = psf->sf_next;
1732                                 else
1733                                         *psf_list = psf->sf_next;
1734                                 kfree(psf);
1735                                 continue;
1736                         }
1737                 }
1738                 psf_prev = psf;
1739         }
1740
1741 empty_source:
1742         if (!stotal) {
1743                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1744                     type == MLD2_BLOCK_OLD_SOURCES)
1745                         return skb;
1746                 if (pmc->mca_crcount || isquery) {
1747                         /* make sure we have room for group header */
1748                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1749                                 mld_sendpack(skb);
1750                                 skb = NULL; /* add_grhead will get a new one */
1751                         }
1752                         skb = add_grhead(skb, pmc, type, &pgr);
1753                 }
1754         }
1755         if (pgr)
1756                 pgr->grec_nsrcs = htons(scount);
1757
1758         if (isquery)
1759                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1760         return skb;
1761 }
1762
1763 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1764 {
1765         struct sk_buff *skb = NULL;
1766         int type;
1767
1768         read_lock_bh(&idev->lock);
1769         if (!pmc) {
1770                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1771                         if (pmc->mca_flags & MAF_NOREPORT)
1772                                 continue;
1773                         spin_lock_bh(&pmc->mca_lock);
1774                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1775                                 type = MLD2_MODE_IS_EXCLUDE;
1776                         else
1777                                 type = MLD2_MODE_IS_INCLUDE;
1778                         skb = add_grec(skb, pmc, type, 0, 0);
1779                         spin_unlock_bh(&pmc->mca_lock);
1780                 }
1781         } else {
1782                 spin_lock_bh(&pmc->mca_lock);
1783                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1784                         type = MLD2_MODE_IS_EXCLUDE;
1785                 else
1786                         type = MLD2_MODE_IS_INCLUDE;
1787                 skb = add_grec(skb, pmc, type, 0, 0);
1788                 spin_unlock_bh(&pmc->mca_lock);
1789         }
1790         read_unlock_bh(&idev->lock);
1791         if (skb)
1792                 mld_sendpack(skb);
1793 }
1794
1795 /*
1796  * remove zero-count source records from a source filter list
1797  */
1798 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1799 {
1800         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1801
1802         psf_prev = NULL;
1803         for (psf=*ppsf; psf; psf = psf_next) {
1804                 psf_next = psf->sf_next;
1805                 if (psf->sf_crcount == 0) {
1806                         if (psf_prev)
1807                                 psf_prev->sf_next = psf->sf_next;
1808                         else
1809                                 *ppsf = psf->sf_next;
1810                         kfree(psf);
1811                 } else
1812                         psf_prev = psf;
1813         }
1814 }
1815
1816 static void mld_send_cr(struct inet6_dev *idev)
1817 {
1818         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1819         struct sk_buff *skb = NULL;
1820         int type, dtype;
1821
1822         read_lock_bh(&idev->lock);
1823         spin_lock(&idev->mc_lock);
1824
1825         /* deleted MCA's */
1826         pmc_prev = NULL;
1827         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1828                 pmc_next = pmc->next;
1829                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1830                         type = MLD2_BLOCK_OLD_SOURCES;
1831                         dtype = MLD2_BLOCK_OLD_SOURCES;
1832                         skb = add_grec(skb, pmc, type, 1, 0);
1833                         skb = add_grec(skb, pmc, dtype, 1, 1);
1834                 }
1835                 if (pmc->mca_crcount) {
1836                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1837                                 type = MLD2_CHANGE_TO_INCLUDE;
1838                                 skb = add_grec(skb, pmc, type, 1, 0);
1839                         }
1840                         pmc->mca_crcount--;
1841                         if (pmc->mca_crcount == 0) {
1842                                 mld_clear_zeros(&pmc->mca_tomb);
1843                                 mld_clear_zeros(&pmc->mca_sources);
1844                         }
1845                 }
1846                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1847                     !pmc->mca_sources) {
1848                         if (pmc_prev)
1849                                 pmc_prev->next = pmc_next;
1850                         else
1851                                 idev->mc_tomb = pmc_next;
1852                         in6_dev_put(pmc->idev);
1853                         kfree(pmc);
1854                 } else
1855                         pmc_prev = pmc;
1856         }
1857         spin_unlock(&idev->mc_lock);
1858
1859         /* change recs */
1860         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1861                 spin_lock_bh(&pmc->mca_lock);
1862                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1863                         type = MLD2_BLOCK_OLD_SOURCES;
1864                         dtype = MLD2_ALLOW_NEW_SOURCES;
1865                 } else {
1866                         type = MLD2_ALLOW_NEW_SOURCES;
1867                         dtype = MLD2_BLOCK_OLD_SOURCES;
1868                 }
1869                 skb = add_grec(skb, pmc, type, 0, 0);
1870                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1871
1872                 /* filter mode changes */
1873                 if (pmc->mca_crcount) {
1874                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1875                                 type = MLD2_CHANGE_TO_EXCLUDE;
1876                         else
1877                                 type = MLD2_CHANGE_TO_INCLUDE;
1878                         skb = add_grec(skb, pmc, type, 0, 0);
1879                         pmc->mca_crcount--;
1880                 }
1881                 spin_unlock_bh(&pmc->mca_lock);
1882         }
1883         read_unlock_bh(&idev->lock);
1884         if (!skb)
1885                 return;
1886         (void) mld_sendpack(skb);
1887 }
1888
1889 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1890 {
1891         struct net *net = dev_net(dev);
1892         struct sock *sk = net->ipv6.igmp_sk;
1893         struct inet6_dev *idev;
1894         struct sk_buff *skb;
1895         struct mld_msg *hdr;
1896         const struct in6_addr *snd_addr, *saddr;
1897         struct in6_addr addr_buf;
1898         int hlen = LL_RESERVED_SPACE(dev);
1899         int tlen = dev->needed_tailroom;
1900         int err, len, payload_len, full_len;
1901         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1902                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1903                      IPV6_TLV_PADN, 0 };
1904         struct flowi6 fl6;
1905         struct dst_entry *dst;
1906
1907         if (type == ICMPV6_MGM_REDUCTION)
1908                 snd_addr = &in6addr_linklocal_allrouters;
1909         else
1910                 snd_addr = addr;
1911
1912         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1913         payload_len = len + sizeof(ra);
1914         full_len = sizeof(struct ipv6hdr) + payload_len;
1915
1916         rcu_read_lock();
1917         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1918                       IPSTATS_MIB_OUT, full_len);
1919         rcu_read_unlock();
1920
1921         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1922
1923         if (skb == NULL) {
1924                 rcu_read_lock();
1925                 IP6_INC_STATS(net, __in6_dev_get(dev),
1926                               IPSTATS_MIB_OUTDISCARDS);
1927                 rcu_read_unlock();
1928                 return;
1929         }
1930         skb->priority = TC_PRIO_CONTROL;
1931         skb_reserve(skb, hlen);
1932
1933         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1934                 /* <draft-ietf-magma-mld-source-05.txt>:
1935                  * use unspecified address as the source address
1936                  * when a valid link-local address is not available.
1937                  */
1938                 saddr = &in6addr_any;
1939         } else
1940                 saddr = &addr_buf;
1941
1942         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1943
1944         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1945
1946         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1947         memset(hdr, 0, sizeof(struct mld_msg));
1948         hdr->mld_type = type;
1949         hdr->mld_mca = *addr;
1950
1951         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1952                                          IPPROTO_ICMPV6,
1953                                          csum_partial(hdr, len, 0));
1954
1955         rcu_read_lock();
1956         idev = __in6_dev_get(skb->dev);
1957
1958         icmpv6_flow_init(sk, &fl6, type,
1959                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1960                          skb->dev->ifindex);
1961         dst = icmp6_dst_alloc(skb->dev, &fl6);
1962         if (IS_ERR(dst)) {
1963                 err = PTR_ERR(dst);
1964                 goto err_out;
1965         }
1966
1967         skb_dst_set(skb, dst);
1968         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1969                       dst_output);
1970 out:
1971         if (!err) {
1972                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1973                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1974                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1975         } else
1976                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1977
1978         rcu_read_unlock();
1979         return;
1980
1981 err_out:
1982         kfree_skb(skb);
1983         goto out;
1984 }
1985
1986 static void mld_resend_report(struct inet6_dev *idev)
1987 {
1988         if (mld_in_v1_mode(idev)) {
1989                 struct ifmcaddr6 *mcaddr;
1990                 read_lock_bh(&idev->lock);
1991                 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) {
1992                         if (!(mcaddr->mca_flags & MAF_NOREPORT))
1993                                 igmp6_send(&mcaddr->mca_addr, idev->dev,
1994                                            ICMPV6_MGM_REPORT);
1995                 }
1996                 read_unlock_bh(&idev->lock);
1997         } else {
1998                 mld_send_report(idev, NULL);
1999         }
2000 }
2001
2002 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2003 {
2004         idev->mc_dad_count = idev->mc_qrv;
2005         if (idev->mc_dad_count) {
2006                 mld_resend_report(idev);
2007                 idev->mc_dad_count--;
2008                 if (idev->mc_dad_count)
2009                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2010         }
2011 }
2012
2013 static void mld_dad_timer_expire(unsigned long data)
2014 {
2015         struct inet6_dev *idev = (struct inet6_dev *)data;
2016
2017         mld_resend_report(idev);
2018         if (idev->mc_dad_count) {
2019                 idev->mc_dad_count--;
2020                 if (idev->mc_dad_count)
2021                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2022         }
2023         __in6_dev_put(idev);
2024 }
2025
2026 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2027         const struct in6_addr *psfsrc)
2028 {
2029         struct ip6_sf_list *psf, *psf_prev;
2030         int rv = 0;
2031
2032         psf_prev = NULL;
2033         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2034                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2035                         break;
2036                 psf_prev = psf;
2037         }
2038         if (!psf || psf->sf_count[sfmode] == 0) {
2039                 /* source filter not found, or count wrong =>  bug */
2040                 return -ESRCH;
2041         }
2042         psf->sf_count[sfmode]--;
2043         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2044                 struct inet6_dev *idev = pmc->idev;
2045
2046                 /* no more filters for this source */
2047                 if (psf_prev)
2048                         psf_prev->sf_next = psf->sf_next;
2049                 else
2050                         pmc->mca_sources = psf->sf_next;
2051                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2052                     !mld_in_v1_mode(idev)) {
2053                         psf->sf_crcount = idev->mc_qrv;
2054                         psf->sf_next = pmc->mca_tomb;
2055                         pmc->mca_tomb = psf;
2056                         rv = 1;
2057                 } else
2058                         kfree(psf);
2059         }
2060         return rv;
2061 }
2062
2063 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2064                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2065                           int delta)
2066 {
2067         struct ifmcaddr6 *pmc;
2068         int     changerec = 0;
2069         int     i, err;
2070
2071         if (!idev)
2072                 return -ENODEV;
2073         read_lock_bh(&idev->lock);
2074         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2075                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2076                         break;
2077         }
2078         if (!pmc) {
2079                 /* MCA not found?? bug */
2080                 read_unlock_bh(&idev->lock);
2081                 return -ESRCH;
2082         }
2083         spin_lock_bh(&pmc->mca_lock);
2084         sf_markstate(pmc);
2085         if (!delta) {
2086                 if (!pmc->mca_sfcount[sfmode]) {
2087                         spin_unlock_bh(&pmc->mca_lock);
2088                         read_unlock_bh(&idev->lock);
2089                         return -EINVAL;
2090                 }
2091                 pmc->mca_sfcount[sfmode]--;
2092         }
2093         err = 0;
2094         for (i=0; i<sfcount; i++) {
2095                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2096
2097                 changerec |= rv > 0;
2098                 if (!err && rv < 0)
2099                         err = rv;
2100         }
2101         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2102             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2103             pmc->mca_sfcount[MCAST_INCLUDE]) {
2104                 struct ip6_sf_list *psf;
2105
2106                 /* filter mode change */
2107                 pmc->mca_sfmode = MCAST_INCLUDE;
2108                 pmc->mca_crcount = idev->mc_qrv;
2109                 idev->mc_ifc_count = pmc->mca_crcount;
2110                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2111                         psf->sf_crcount = 0;
2112                 mld_ifc_event(pmc->idev);
2113         } else if (sf_setstate(pmc) || changerec)
2114                 mld_ifc_event(pmc->idev);
2115         spin_unlock_bh(&pmc->mca_lock);
2116         read_unlock_bh(&idev->lock);
2117         return err;
2118 }
2119
2120 /*
2121  * Add multicast single-source filter to the interface list
2122  */
2123 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2124         const struct in6_addr *psfsrc)
2125 {
2126         struct ip6_sf_list *psf, *psf_prev;
2127
2128         psf_prev = NULL;
2129         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2130                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2131                         break;
2132                 psf_prev = psf;
2133         }
2134         if (!psf) {
2135                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2136                 if (!psf)
2137                         return -ENOBUFS;
2138
2139                 psf->sf_addr = *psfsrc;
2140                 if (psf_prev) {
2141                         psf_prev->sf_next = psf;
2142                 } else
2143                         pmc->mca_sources = psf;
2144         }
2145         psf->sf_count[sfmode]++;
2146         return 0;
2147 }
2148
2149 static void sf_markstate(struct ifmcaddr6 *pmc)
2150 {
2151         struct ip6_sf_list *psf;
2152         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2153
2154         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2155                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2156                         psf->sf_oldin = mca_xcount ==
2157                                 psf->sf_count[MCAST_EXCLUDE] &&
2158                                 !psf->sf_count[MCAST_INCLUDE];
2159                 } else
2160                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2161 }
2162
2163 static int sf_setstate(struct ifmcaddr6 *pmc)
2164 {
2165         struct ip6_sf_list *psf, *dpsf;
2166         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2167         int qrv = pmc->idev->mc_qrv;
2168         int new_in, rv;
2169
2170         rv = 0;
2171         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2172                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2173                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2174                                 !psf->sf_count[MCAST_INCLUDE];
2175                 } else
2176                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2177                 if (new_in) {
2178                         if (!psf->sf_oldin) {
2179                                 struct ip6_sf_list *prev = NULL;
2180
2181                                 for (dpsf=pmc->mca_tomb; dpsf;
2182                                      dpsf=dpsf->sf_next) {
2183                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2184                                             &psf->sf_addr))
2185                                                 break;
2186                                         prev = dpsf;
2187                                 }
2188                                 if (dpsf) {
2189                                         if (prev)
2190                                                 prev->sf_next = dpsf->sf_next;
2191                                         else
2192                                                 pmc->mca_tomb = dpsf->sf_next;
2193                                         kfree(dpsf);
2194                                 }
2195                                 psf->sf_crcount = qrv;
2196                                 rv++;
2197                         }
2198                 } else if (psf->sf_oldin) {
2199                         psf->sf_crcount = 0;
2200                         /*
2201                          * add or update "delete" records if an active filter
2202                          * is now inactive
2203                          */
2204                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2205                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2206                                     &psf->sf_addr))
2207                                         break;
2208                         if (!dpsf) {
2209                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2210                                 if (!dpsf)
2211                                         continue;
2212                                 *dpsf = *psf;
2213                                 /* pmc->mca_lock held by callers */
2214                                 dpsf->sf_next = pmc->mca_tomb;
2215                                 pmc->mca_tomb = dpsf;
2216                         }
2217                         dpsf->sf_crcount = qrv;
2218                         rv++;
2219                 }
2220         }
2221         return rv;
2222 }
2223
2224 /*
2225  * Add multicast source filter list to the interface list
2226  */
2227 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2228                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2229                           int delta)
2230 {
2231         struct ifmcaddr6 *pmc;
2232         int     isexclude;
2233         int     i, err;
2234
2235         if (!idev)
2236                 return -ENODEV;
2237         read_lock_bh(&idev->lock);
2238         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2239                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2240                         break;
2241         }
2242         if (!pmc) {
2243                 /* MCA not found?? bug */
2244                 read_unlock_bh(&idev->lock);
2245                 return -ESRCH;
2246         }
2247         spin_lock_bh(&pmc->mca_lock);
2248
2249         sf_markstate(pmc);
2250         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2251         if (!delta)
2252                 pmc->mca_sfcount[sfmode]++;
2253         err = 0;
2254         for (i=0; i<sfcount; i++) {
2255                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2256                 if (err)
2257                         break;
2258         }
2259         if (err) {
2260                 int j;
2261
2262                 if (!delta)
2263                         pmc->mca_sfcount[sfmode]--;
2264                 for (j=0; j<i; j++)
2265                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2266         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2267                 struct ip6_sf_list *psf;
2268
2269                 /* filter mode change */
2270                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2271                         pmc->mca_sfmode = MCAST_EXCLUDE;
2272                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2273                         pmc->mca_sfmode = MCAST_INCLUDE;
2274                 /* else no filters; keep old mode for reports */
2275
2276                 pmc->mca_crcount = idev->mc_qrv;
2277                 idev->mc_ifc_count = pmc->mca_crcount;
2278                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2279                         psf->sf_crcount = 0;
2280                 mld_ifc_event(idev);
2281         } else if (sf_setstate(pmc))
2282                 mld_ifc_event(idev);
2283         spin_unlock_bh(&pmc->mca_lock);
2284         read_unlock_bh(&idev->lock);
2285         return err;
2286 }
2287
2288 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2289 {
2290         struct ip6_sf_list *psf, *nextpsf;
2291
2292         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2293                 nextpsf = psf->sf_next;
2294                 kfree(psf);
2295         }
2296         pmc->mca_tomb = NULL;
2297         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2298                 nextpsf = psf->sf_next;
2299                 kfree(psf);
2300         }
2301         pmc->mca_sources = NULL;
2302         pmc->mca_sfmode = MCAST_EXCLUDE;
2303         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2304         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2305 }
2306
2307
2308 static void igmp6_join_group(struct ifmcaddr6 *ma)
2309 {
2310         unsigned long delay;
2311
2312         if (ma->mca_flags & MAF_NOREPORT)
2313                 return;
2314
2315         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2316
2317         delay = net_random() % unsolicited_report_interval(ma->idev);
2318
2319         spin_lock_bh(&ma->mca_lock);
2320         if (del_timer(&ma->mca_timer)) {
2321                 atomic_dec(&ma->mca_refcnt);
2322                 delay = ma->mca_timer.expires - jiffies;
2323         }
2324
2325         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2326                 atomic_inc(&ma->mca_refcnt);
2327         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2328         spin_unlock_bh(&ma->mca_lock);
2329 }
2330
2331 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2332                             struct inet6_dev *idev)
2333 {
2334         int err;
2335
2336         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2337          * so no other readers or writers of iml or its sflist
2338          */
2339         if (!iml->sflist) {
2340                 /* any-source empty exclude case */
2341                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2342         }
2343         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2344                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2345         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2346         iml->sflist = NULL;
2347         return err;
2348 }
2349
2350 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2351 {
2352         if (mld_in_v1_mode(ma->idev)) {
2353                 if (ma->mca_flags & MAF_LAST_REPORTER)
2354                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2355                                 ICMPV6_MGM_REDUCTION);
2356         } else {
2357                 mld_add_delrec(ma->idev, ma);
2358                 mld_ifc_event(ma->idev);
2359         }
2360 }
2361
2362 static void mld_gq_timer_expire(unsigned long data)
2363 {
2364         struct inet6_dev *idev = (struct inet6_dev *)data;
2365
2366         idev->mc_gq_running = 0;
2367         mld_send_report(idev, NULL);
2368         __in6_dev_put(idev);
2369 }
2370
2371 static void mld_ifc_timer_expire(unsigned long data)
2372 {
2373         struct inet6_dev *idev = (struct inet6_dev *)data;
2374
2375         mld_send_cr(idev);
2376         if (idev->mc_ifc_count) {
2377                 idev->mc_ifc_count--;
2378                 if (idev->mc_ifc_count)
2379                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2380         }
2381         __in6_dev_put(idev);
2382 }
2383
2384 static void mld_ifc_event(struct inet6_dev *idev)
2385 {
2386         if (mld_in_v1_mode(idev))
2387                 return;
2388         idev->mc_ifc_count = idev->mc_qrv;
2389         mld_ifc_start_timer(idev, 1);
2390 }
2391
2392
2393 static void igmp6_timer_handler(unsigned long data)
2394 {
2395         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2396
2397         if (mld_in_v1_mode(ma->idev))
2398                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2399         else
2400                 mld_send_report(ma->idev, ma);
2401
2402         spin_lock(&ma->mca_lock);
2403         ma->mca_flags |=  MAF_LAST_REPORTER;
2404         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2405         spin_unlock(&ma->mca_lock);
2406         ma_put(ma);
2407 }
2408
2409 /* Device changing type */
2410
2411 void ipv6_mc_unmap(struct inet6_dev *idev)
2412 {
2413         struct ifmcaddr6 *i;
2414
2415         /* Install multicast list, except for all-nodes (already installed) */
2416
2417         read_lock_bh(&idev->lock);
2418         for (i = idev->mc_list; i; i = i->next)
2419                 igmp6_group_dropped(i);
2420         read_unlock_bh(&idev->lock);
2421 }
2422
2423 void ipv6_mc_remap(struct inet6_dev *idev)
2424 {
2425         ipv6_mc_up(idev);
2426 }
2427
2428 /* Device going down */
2429
2430 void ipv6_mc_down(struct inet6_dev *idev)
2431 {
2432         struct ifmcaddr6 *i;
2433
2434         /* Withdraw multicast list */
2435
2436         read_lock_bh(&idev->lock);
2437         idev->mc_ifc_count = 0;
2438         if (del_timer(&idev->mc_ifc_timer))
2439                 __in6_dev_put(idev);
2440         idev->mc_gq_running = 0;
2441         if (del_timer(&idev->mc_gq_timer))
2442                 __in6_dev_put(idev);
2443         if (del_timer(&idev->mc_dad_timer))
2444                 __in6_dev_put(idev);
2445
2446         for (i = idev->mc_list; i; i=i->next)
2447                 igmp6_group_dropped(i);
2448         read_unlock_bh(&idev->lock);
2449
2450         mld_clear_delrec(idev);
2451 }
2452
2453
2454 /* Device going up */
2455
2456 void ipv6_mc_up(struct inet6_dev *idev)
2457 {
2458         struct ifmcaddr6 *i;
2459
2460         /* Install multicast list, except for all-nodes (already installed) */
2461
2462         read_lock_bh(&idev->lock);
2463         for (i = idev->mc_list; i; i=i->next)
2464                 igmp6_group_added(i);
2465         read_unlock_bh(&idev->lock);
2466 }
2467
2468 /* IPv6 device initialization. */
2469
2470 void ipv6_mc_init_dev(struct inet6_dev *idev)
2471 {
2472         write_lock_bh(&idev->lock);
2473         spin_lock_init(&idev->mc_lock);
2474         idev->mc_gq_running = 0;
2475         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2476                         (unsigned long)idev);
2477         idev->mc_tomb = NULL;
2478         idev->mc_ifc_count = 0;
2479         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2480                         (unsigned long)idev);
2481         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2482                     (unsigned long)idev);
2483
2484         idev->mc_qrv = MLD_QRV_DEFAULT;
2485         idev->mc_qi = MLD_QI_DEFAULT;
2486         idev->mc_qri = MLD_QRI_DEFAULT;
2487
2488         idev->mc_maxdelay = unsolicited_report_interval(idev);
2489         idev->mc_v1_seen = 0;
2490         write_unlock_bh(&idev->lock);
2491 }
2492
2493 /*
2494  *      Device is about to be destroyed: clean up.
2495  */
2496
2497 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2498 {
2499         struct ifmcaddr6 *i;
2500
2501         /* Deactivate timers */
2502         ipv6_mc_down(idev);
2503
2504         /* Delete all-nodes address. */
2505         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2506          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2507          * fail.
2508          */
2509         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2510
2511         if (idev->cnf.forwarding)
2512                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2513
2514         write_lock_bh(&idev->lock);
2515         while ((i = idev->mc_list) != NULL) {
2516                 idev->mc_list = i->next;
2517                 write_unlock_bh(&idev->lock);
2518
2519                 igmp6_group_dropped(i);
2520                 ma_put(i);
2521
2522                 write_lock_bh(&idev->lock);
2523         }
2524         write_unlock_bh(&idev->lock);
2525 }
2526
2527 #ifdef CONFIG_PROC_FS
2528 struct igmp6_mc_iter_state {
2529         struct seq_net_private p;
2530         struct net_device *dev;
2531         struct inet6_dev *idev;
2532 };
2533
2534 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2535
2536 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2537 {
2538         struct ifmcaddr6 *im = NULL;
2539         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2540         struct net *net = seq_file_net(seq);
2541
2542         state->idev = NULL;
2543         for_each_netdev_rcu(net, state->dev) {
2544                 struct inet6_dev *idev;
2545                 idev = __in6_dev_get(state->dev);
2546                 if (!idev)
2547                         continue;
2548                 read_lock_bh(&idev->lock);
2549                 im = idev->mc_list;
2550                 if (im) {
2551                         state->idev = idev;
2552                         break;
2553                 }
2554                 read_unlock_bh(&idev->lock);
2555         }
2556         return im;
2557 }
2558
2559 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2560 {
2561         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2562
2563         im = im->next;
2564         while (!im) {
2565                 if (likely(state->idev != NULL))
2566                         read_unlock_bh(&state->idev->lock);
2567
2568                 state->dev = next_net_device_rcu(state->dev);
2569                 if (!state->dev) {
2570                         state->idev = NULL;
2571                         break;
2572                 }
2573                 state->idev = __in6_dev_get(state->dev);
2574                 if (!state->idev)
2575                         continue;
2576                 read_lock_bh(&state->idev->lock);
2577                 im = state->idev->mc_list;
2578         }
2579         return im;
2580 }
2581
2582 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2583 {
2584         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2585         if (im)
2586                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2587                         --pos;
2588         return pos ? NULL : im;
2589 }
2590
2591 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2592         __acquires(RCU)
2593 {
2594         rcu_read_lock();
2595         return igmp6_mc_get_idx(seq, *pos);
2596 }
2597
2598 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2599 {
2600         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2601
2602         ++*pos;
2603         return im;
2604 }
2605
2606 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2607         __releases(RCU)
2608 {
2609         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2610
2611         if (likely(state->idev != NULL)) {
2612                 read_unlock_bh(&state->idev->lock);
2613                 state->idev = NULL;
2614         }
2615         state->dev = NULL;
2616         rcu_read_unlock();
2617 }
2618
2619 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2620 {
2621         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2622         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2623
2624         seq_printf(seq,
2625                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2626                    state->dev->ifindex, state->dev->name,
2627                    &im->mca_addr,
2628                    im->mca_users, im->mca_flags,
2629                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2630                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2631         return 0;
2632 }
2633
2634 static const struct seq_operations igmp6_mc_seq_ops = {
2635         .start  =       igmp6_mc_seq_start,
2636         .next   =       igmp6_mc_seq_next,
2637         .stop   =       igmp6_mc_seq_stop,
2638         .show   =       igmp6_mc_seq_show,
2639 };
2640
2641 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2642 {
2643         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2644                             sizeof(struct igmp6_mc_iter_state));
2645 }
2646
2647 static const struct file_operations igmp6_mc_seq_fops = {
2648         .owner          =       THIS_MODULE,
2649         .open           =       igmp6_mc_seq_open,
2650         .read           =       seq_read,
2651         .llseek         =       seq_lseek,
2652         .release        =       seq_release_net,
2653 };
2654
2655 struct igmp6_mcf_iter_state {
2656         struct seq_net_private p;
2657         struct net_device *dev;
2658         struct inet6_dev *idev;
2659         struct ifmcaddr6 *im;
2660 };
2661
2662 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2663
2664 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2665 {
2666         struct ip6_sf_list *psf = NULL;
2667         struct ifmcaddr6 *im = NULL;
2668         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2669         struct net *net = seq_file_net(seq);
2670
2671         state->idev = NULL;
2672         state->im = NULL;
2673         for_each_netdev_rcu(net, state->dev) {
2674                 struct inet6_dev *idev;
2675                 idev = __in6_dev_get(state->dev);
2676                 if (unlikely(idev == NULL))
2677                         continue;
2678                 read_lock_bh(&idev->lock);
2679                 im = idev->mc_list;
2680                 if (likely(im != NULL)) {
2681                         spin_lock_bh(&im->mca_lock);
2682                         psf = im->mca_sources;
2683                         if (likely(psf != NULL)) {
2684                                 state->im = im;
2685                                 state->idev = idev;
2686                                 break;
2687                         }
2688                         spin_unlock_bh(&im->mca_lock);
2689                 }
2690                 read_unlock_bh(&idev->lock);
2691         }
2692         return psf;
2693 }
2694
2695 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2696 {
2697         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2698
2699         psf = psf->sf_next;
2700         while (!psf) {
2701                 spin_unlock_bh(&state->im->mca_lock);
2702                 state->im = state->im->next;
2703                 while (!state->im) {
2704                         if (likely(state->idev != NULL))
2705                                 read_unlock_bh(&state->idev->lock);
2706
2707                         state->dev = next_net_device_rcu(state->dev);
2708                         if (!state->dev) {
2709                                 state->idev = NULL;
2710                                 goto out;
2711                         }
2712                         state->idev = __in6_dev_get(state->dev);
2713                         if (!state->idev)
2714                                 continue;
2715                         read_lock_bh(&state->idev->lock);
2716                         state->im = state->idev->mc_list;
2717                 }
2718                 if (!state->im)
2719                         break;
2720                 spin_lock_bh(&state->im->mca_lock);
2721                 psf = state->im->mca_sources;
2722         }
2723 out:
2724         return psf;
2725 }
2726
2727 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2728 {
2729         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2730         if (psf)
2731                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2732                         --pos;
2733         return pos ? NULL : psf;
2734 }
2735
2736 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2737         __acquires(RCU)
2738 {
2739         rcu_read_lock();
2740         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2741 }
2742
2743 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2744 {
2745         struct ip6_sf_list *psf;
2746         if (v == SEQ_START_TOKEN)
2747                 psf = igmp6_mcf_get_first(seq);
2748         else
2749                 psf = igmp6_mcf_get_next(seq, v);
2750         ++*pos;
2751         return psf;
2752 }
2753
2754 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2755         __releases(RCU)
2756 {
2757         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2758         if (likely(state->im != NULL)) {
2759                 spin_unlock_bh(&state->im->mca_lock);
2760                 state->im = NULL;
2761         }
2762         if (likely(state->idev != NULL)) {
2763                 read_unlock_bh(&state->idev->lock);
2764                 state->idev = NULL;
2765         }
2766         state->dev = NULL;
2767         rcu_read_unlock();
2768 }
2769
2770 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2771 {
2772         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2773         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2774
2775         if (v == SEQ_START_TOKEN) {
2776                 seq_printf(seq,
2777                            "%3s %6s "
2778                            "%32s %32s %6s %6s\n", "Idx",
2779                            "Device", "Multicast Address",
2780                            "Source Address", "INC", "EXC");
2781         } else {
2782                 seq_printf(seq,
2783                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2784                            state->dev->ifindex, state->dev->name,
2785                            &state->im->mca_addr,
2786                            &psf->sf_addr,
2787                            psf->sf_count[MCAST_INCLUDE],
2788                            psf->sf_count[MCAST_EXCLUDE]);
2789         }
2790         return 0;
2791 }
2792
2793 static const struct seq_operations igmp6_mcf_seq_ops = {
2794         .start  =       igmp6_mcf_seq_start,
2795         .next   =       igmp6_mcf_seq_next,
2796         .stop   =       igmp6_mcf_seq_stop,
2797         .show   =       igmp6_mcf_seq_show,
2798 };
2799
2800 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2801 {
2802         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2803                             sizeof(struct igmp6_mcf_iter_state));
2804 }
2805
2806 static const struct file_operations igmp6_mcf_seq_fops = {
2807         .owner          =       THIS_MODULE,
2808         .open           =       igmp6_mcf_seq_open,
2809         .read           =       seq_read,
2810         .llseek         =       seq_lseek,
2811         .release        =       seq_release_net,
2812 };
2813
2814 static int __net_init igmp6_proc_init(struct net *net)
2815 {
2816         int err;
2817
2818         err = -ENOMEM;
2819         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2820                 goto out;
2821         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2822                          &igmp6_mcf_seq_fops))
2823                 goto out_proc_net_igmp6;
2824
2825         err = 0;
2826 out:
2827         return err;
2828
2829 out_proc_net_igmp6:
2830         remove_proc_entry("igmp6", net->proc_net);
2831         goto out;
2832 }
2833
2834 static void __net_exit igmp6_proc_exit(struct net *net)
2835 {
2836         remove_proc_entry("mcfilter6", net->proc_net);
2837         remove_proc_entry("igmp6", net->proc_net);
2838 }
2839 #else
2840 static inline int igmp6_proc_init(struct net *net)
2841 {
2842         return 0;
2843 }
2844 static inline void igmp6_proc_exit(struct net *net)
2845 {
2846 }
2847 #endif
2848
2849 static int __net_init igmp6_net_init(struct net *net)
2850 {
2851         int err;
2852
2853         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2854                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2855         if (err < 0) {
2856                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2857                        err);
2858                 goto out;
2859         }
2860
2861         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2862
2863         err = igmp6_proc_init(net);
2864         if (err)
2865                 goto out_sock_create;
2866 out:
2867         return err;
2868
2869 out_sock_create:
2870         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2871         goto out;
2872 }
2873
2874 static void __net_exit igmp6_net_exit(struct net *net)
2875 {
2876         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2877         igmp6_proc_exit(net);
2878 }
2879
2880 static struct pernet_operations igmp6_net_ops = {
2881         .init = igmp6_net_init,
2882         .exit = igmp6_net_exit,
2883 };
2884
2885 int __init igmp6_init(void)
2886 {
2887         return register_pernet_subsys(&igmp6_net_ops);
2888 }
2889
2890 void igmp6_cleanup(void)
2891 {
2892         unregister_pernet_subsys(&igmp6_net_ops);
2893 }