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 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
 125
 126 /*
 127  *      socket join on multicast group
 128  */
 129
 130 #define for_each_pmc_rcu(np, pmc)                               \
 131         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 132              pmc != NULL;                                       \
 133              pmc = rcu_dereference(pmc->next))
 134
 135 static int unsolicited_report_interval(struct inet6_dev *idev)
 136 {
 137         int iv;
 138
 139         if (mld_in_v1_mode(idev))
 140                 iv = idev->cnf.mldv1_unsolicited_report_interval;
 141         else
 142                 iv = idev->cnf.mldv2_unsolicited_report_interval;
 143
 144         return iv > 0 ? iv : 1;
 145 }
 146
 147 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 148 {
 149         struct net_device *dev = NULL;
 150         struct ipv6_mc_socklist *mc_lst;
 151         struct ipv6_pinfo *np = inet6_sk(sk);
 152         struct net *net = sock_net(sk);
 153         int err;
 154
 155         if (!ipv6_addr_is_multicast(addr))
 156                 return -EINVAL;
 157
 158         rcu_read_lock();
 159         for_each_pmc_rcu(np, mc_lst) {
 160                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 161                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 162                         rcu_read_unlock();
 163                         return -EADDRINUSE;
 164                 }
 165         }
 166         rcu_read_unlock();
 167
 168         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 169
 170         if (mc_lst == NULL)
 171                 return -ENOMEM;
 172
 173         mc_lst->next = NULL;
 174         mc_lst->addr = *addr;
 175
 176         rcu_read_lock();
 177         if (ifindex == 0) {
 178                 struct rt6_info *rt;
 179                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 180                 if (rt) {
 181                         dev = rt->dst.dev;
 182                         ip6_rt_put(rt);
 183                 }
 184         } else
 185                 dev = dev_get_by_index_rcu(net, ifindex);
 186
 187         if (dev == NULL) {
 188                 rcu_read_unlock();
 189                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 190                 return -ENODEV;
 191         }
 192
 193         mc_lst->ifindex = dev->ifindex;
 194         mc_lst->sfmode = MCAST_EXCLUDE;
 195         rwlock_init(&mc_lst->sflock);
 196         mc_lst->sflist = NULL;
 197
 198         /*
 199          *      now add/increase the group membership on the device
 200          */
 201
 202         err = ipv6_dev_mc_inc(dev, addr);
 203
 204         if (err) {
 205                 rcu_read_unlock();
 206                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 207                 return err;
 208         }
 209
 210         spin_lock(&ipv6_sk_mc_lock);
 211         mc_lst->next = np->ipv6_mc_list;
 212         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 213         spin_unlock(&ipv6_sk_mc_lock);
 214
 215         rcu_read_unlock();
 216
 217         return 0;
 218 }
 219
 220 /*
 221  *      socket leave on multicast group
 222  */
 223 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 224 {
 225         struct ipv6_pinfo *np = inet6_sk(sk);
 226         struct ipv6_mc_socklist *mc_lst;
 227         struct ipv6_mc_socklist __rcu **lnk;
 228         struct net *net = sock_net(sk);
 229
 230         if (!ipv6_addr_is_multicast(addr))
 231                 return -EINVAL;
 232
 233         spin_lock(&ipv6_sk_mc_lock);
 234         for (lnk = &np->ipv6_mc_list;
 235              (mc_lst = rcu_dereference_protected(*lnk,
 236                         lockdep_is_held(&ipv6_sk_mc_lock))) != NULL;
 237               lnk = &mc_lst->next) {
 238                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 239                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 240                         struct net_device *dev;
 241
 242                         *lnk = mc_lst->next;
 243                         spin_unlock(&ipv6_sk_mc_lock);
 244
 245                         rcu_read_lock();
 246                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 247                         if (dev != NULL) {
 248                                 struct inet6_dev *idev = __in6_dev_get(dev);
 249
 250                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 251                                 if (idev)
 252                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 253                         } else
 254                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 255                         rcu_read_unlock();
 256                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 257                         kfree_rcu(mc_lst, rcu);
 258                         return 0;
 259                 }
 260         }
 261         spin_unlock(&ipv6_sk_mc_lock);
 262
 263         return -EADDRNOTAVAIL;
 264 }
 265
 266 /* called with rcu_read_lock() */
 267 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 268                                              const struct in6_addr *group,
 269                                              int ifindex)
 270 {
 271         struct net_device *dev = NULL;
 272         struct inet6_dev *idev = NULL;
 273
 274         if (ifindex == 0) {
 275                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 276
 277                 if (rt) {
 278                         dev = rt->dst.dev;
 279                         ip6_rt_put(rt);
 280                 }
 281         } else
 282                 dev = dev_get_by_index_rcu(net, ifindex);
 283
 284         if (!dev)
 285                 return NULL;
 286         idev = __in6_dev_get(dev);
 287         if (!idev)
 288                 return NULL;
 289         read_lock_bh(&idev->lock);
 290         if (idev->dead) {
 291                 read_unlock_bh(&idev->lock);
 292                 return NULL;
 293         }
 294         return idev;
 295 }
 296
 297 void ipv6_sock_mc_close(struct sock *sk)
 298 {
 299         struct ipv6_pinfo *np = inet6_sk(sk);
 300         struct ipv6_mc_socklist *mc_lst;
 301         struct net *net = sock_net(sk);
 302
 303         if (!rcu_access_pointer(np->ipv6_mc_list))
 304                 return;
 305
 306         spin_lock(&ipv6_sk_mc_lock);
 307         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 308                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 309                 struct net_device *dev;
 310
 311                 np->ipv6_mc_list = mc_lst->next;
 312                 spin_unlock(&ipv6_sk_mc_lock);
 313
 314                 rcu_read_lock();
 315                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 316                 if (dev) {
 317                         struct inet6_dev *idev = __in6_dev_get(dev);
 318
 319                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 320                         if (idev)
 321                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 322                 } else
 323                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 324                 rcu_read_unlock();
 325
 326                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 327                 kfree_rcu(mc_lst, rcu);
 328
 329                 spin_lock(&ipv6_sk_mc_lock);
 330         }
 331         spin_unlock(&ipv6_sk_mc_lock);
 332 }
 333
 334 int ip6_mc_source(int add, int omode, struct sock *sk,
 335         struct group_source_req *pgsr)
 336 {
 337         struct in6_addr *source, *group;
 338         struct ipv6_mc_socklist *pmc;
 339         struct inet6_dev *idev;
 340         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 341         struct ip6_sf_socklist *psl;
 342         struct net *net = sock_net(sk);
 343         int i, j, rv;
 344         int leavegroup = 0;
 345         int pmclocked = 0;
 346         int err;
 347
 348         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 349         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 350
 351         if (!ipv6_addr_is_multicast(group))
 352                 return -EINVAL;
 353
 354         rcu_read_lock();
 355         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 356         if (!idev) {
 357                 rcu_read_unlock();
 358                 return -ENODEV;
 359         }
 360
 361         err = -EADDRNOTAVAIL;
 362
 363         for_each_pmc_rcu(inet6, pmc) {
 364                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 365                         continue;
 366                 if (ipv6_addr_equal(&pmc->addr, group))
 367                         break;
 368         }
 369         if (!pmc) {             /* must have a prior join */
 370                 err = -EINVAL;
 371                 goto done;
 372         }
 373         /* if a source filter was set, must be the same mode as before */
 374         if (pmc->sflist) {
 375                 if (pmc->sfmode != omode) {
 376                         err = -EINVAL;
 377                         goto done;
 378                 }
 379         } else if (pmc->sfmode != omode) {
 380                 /* allow mode switches for empty-set filters */
 381                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 382                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 383                 pmc->sfmode = omode;
 384         }
 385
 386         write_lock(&pmc->sflock);
 387         pmclocked = 1;
 388
 389         psl = pmc->sflist;
 390         if (!add) {
 391                 if (!psl)
 392                         goto done;      /* err = -EADDRNOTAVAIL */
 393                 rv = !0;
 394                 for (i = 0; i < psl->sl_count; i++) {
 395                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 396                         if (rv == 0)
 397                                 break;
 398                 }
 399                 if (rv)         /* source not found */
 400                         goto done;      /* err = -EADDRNOTAVAIL */
 401
 402                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 403                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 404                         leavegroup = 1;
 405                         goto done;
 406                 }
 407
 408                 /* update the interface filter */
 409                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 410
 411                 for (j = i+1; j < psl->sl_count; j++)
 412                         psl->sl_addr[j-1] = psl->sl_addr[j];
 413                 psl->sl_count--;
 414                 err = 0;
 415                 goto done;
 416         }
 417         /* else, add a new source to the filter */
 418
 419         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 420                 err = -ENOBUFS;
 421                 goto done;
 422         }
 423         if (!psl || psl->sl_count == psl->sl_max) {
 424                 struct ip6_sf_socklist *newpsl;
 425                 int count = IP6_SFBLOCK;
 426
 427                 if (psl)
 428                         count += psl->sl_max;
 429                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 430                 if (!newpsl) {
 431                         err = -ENOBUFS;
 432                         goto done;
 433                 }
 434                 newpsl->sl_max = count;
 435                 newpsl->sl_count = count - IP6_SFBLOCK;
 436                 if (psl) {
 437                         for (i = 0; i < psl->sl_count; i++)
 438                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 439                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 440                 }
 441                 pmc->sflist = psl = newpsl;
 442         }
 443         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 444         for (i = 0; i < psl->sl_count; i++) {
 445                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 446                 if (rv == 0) /* There is an error in the address. */
 447                         goto done;
 448         }
 449         for (j = psl->sl_count-1; j >= i; j--)
 450                 psl->sl_addr[j+1] = psl->sl_addr[j];
 451         psl->sl_addr[i] = *source;
 452         psl->sl_count++;
 453         err = 0;
 454         /* update the interface list */
 455         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 456 done:
 457         if (pmclocked)
 458                 write_unlock(&pmc->sflock);
 459         read_unlock_bh(&idev->lock);
 460         rcu_read_unlock();
 461         if (leavegroup)
 462                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 463         return err;
 464 }
 465
 466 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 467 {
 468         const struct in6_addr *group;
 469         struct ipv6_mc_socklist *pmc;
 470         struct inet6_dev *idev;
 471         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 472         struct ip6_sf_socklist *newpsl, *psl;
 473         struct net *net = sock_net(sk);
 474         int leavegroup = 0;
 475         int i, err;
 476
 477         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 478
 479         if (!ipv6_addr_is_multicast(group))
 480                 return -EINVAL;
 481         if (gsf->gf_fmode != MCAST_INCLUDE &&
 482             gsf->gf_fmode != MCAST_EXCLUDE)
 483                 return -EINVAL;
 484
 485         rcu_read_lock();
 486         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 487
 488         if (!idev) {
 489                 rcu_read_unlock();
 490                 return -ENODEV;
 491         }
 492
 493         err = 0;
 494
 495         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 496                 leavegroup = 1;
 497                 goto done;
 498         }
 499
 500         for_each_pmc_rcu(inet6, pmc) {
 501                 if (pmc->ifindex != gsf->gf_interface)
 502                         continue;
 503                 if (ipv6_addr_equal(&pmc->addr, group))
 504                         break;
 505         }
 506         if (!pmc) {             /* must have a prior join */
 507                 err = -EINVAL;
 508                 goto done;
 509         }
 510         if (gsf->gf_numsrc) {
 511                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 512                                                           GFP_ATOMIC);
 513                 if (!newpsl) {
 514                         err = -ENOBUFS;
 515                         goto done;
 516                 }
 517                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 518                 for (i = 0; i < newpsl->sl_count; ++i) {
 519                         struct sockaddr_in6 *psin6;
 520
 521                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 522                         newpsl->sl_addr[i] = psin6->sin6_addr;
 523                 }
 524                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 525                         newpsl->sl_count, newpsl->sl_addr, 0);
 526                 if (err) {
 527                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 528                         goto done;
 529                 }
 530         } else {
 531                 newpsl = NULL;
 532                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 533         }
 534
 535         write_lock(&pmc->sflock);
 536         psl = pmc->sflist;
 537         if (psl) {
 538                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 539                         psl->sl_count, psl->sl_addr, 0);
 540                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 541         } else
 542                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 543         pmc->sflist = newpsl;
 544         pmc->sfmode = gsf->gf_fmode;
 545         write_unlock(&pmc->sflock);
 546         err = 0;
 547 done:
 548         read_unlock_bh(&idev->lock);
 549         rcu_read_unlock();
 550         if (leavegroup)
 551                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 552         return err;
 553 }
 554
 555 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 556         struct group_filter __user *optval, int __user *optlen)
 557 {
 558         int err, i, count, copycount;
 559         const struct in6_addr *group;
 560         struct ipv6_mc_socklist *pmc;
 561         struct inet6_dev *idev;
 562         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 563         struct ip6_sf_socklist *psl;
 564         struct net *net = sock_net(sk);
 565
 566         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 567
 568         if (!ipv6_addr_is_multicast(group))
 569                 return -EINVAL;
 570
 571         rcu_read_lock();
 572         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 573
 574         if (!idev) {
 575                 rcu_read_unlock();
 576                 return -ENODEV;
 577         }
 578
 579         err = -EADDRNOTAVAIL;
 580         /*
 581          * changes to the ipv6_mc_list require the socket lock and
 582          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 583          * so reading the list is safe.
 584          */
 585
 586         for_each_pmc_rcu(inet6, pmc) {
 587                 if (pmc->ifindex != gsf->gf_interface)
 588                         continue;
 589                 if (ipv6_addr_equal(group, &pmc->addr))
 590                         break;
 591         }
 592         if (!pmc)               /* must have a prior join */
 593                 goto done;
 594         gsf->gf_fmode = pmc->sfmode;
 595         psl = pmc->sflist;
 596         count = psl ? psl->sl_count : 0;
 597         read_unlock_bh(&idev->lock);
 598         rcu_read_unlock();
 599
 600         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 601         gsf->gf_numsrc = count;
 602         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 603             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 604                 return -EFAULT;
 605         }
 606         /* changes to psl require the socket lock, a read lock on
 607          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 608          * have the socket lock, so reading here is safe.
 609          */
 610         for (i = 0; i < copycount; i++) {
 611                 struct sockaddr_in6 *psin6;
 612                 struct sockaddr_storage ss;
 613
 614                 psin6 = (struct sockaddr_in6 *)&ss;
 615                 memset(&ss, 0, sizeof(ss));
 616                 psin6->sin6_family = AF_INET6;
 617                 psin6->sin6_addr = psl->sl_addr[i];
 618                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 619                         return -EFAULT;
 620         }
 621         return 0;
 622 done:
 623         read_unlock_bh(&idev->lock);
 624         rcu_read_unlock();
 625         return err;
 626 }
 627
 628 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 629                     const struct in6_addr *src_addr)
 630 {
 631         struct ipv6_pinfo *np = inet6_sk(sk);
 632         struct ipv6_mc_socklist *mc;
 633         struct ip6_sf_socklist *psl;
 634         bool rv = true;
 635
 636         rcu_read_lock();
 637         for_each_pmc_rcu(np, mc) {
 638                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 639                         break;
 640         }
 641         if (!mc) {
 642                 rcu_read_unlock();
 643                 return true;
 644         }
 645         read_lock(&mc->sflock);
 646         psl = mc->sflist;
 647         if (!psl) {
 648                 rv = mc->sfmode == MCAST_EXCLUDE;
 649         } else {
 650                 int i;
 651
 652                 for (i = 0; i < psl->sl_count; i++) {
 653                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 654                                 break;
 655                 }
 656                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 657                         rv = false;
 658                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 659                         rv = false;
 660         }
 661         read_unlock(&mc->sflock);
 662         rcu_read_unlock();
 663
 664         return rv;
 665 }
 666
 667 static void ma_put(struct ifmcaddr6 *mc)
 668 {
 669         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 670                 in6_dev_put(mc->idev);
 671                 kfree(mc);
 672         }
 673 }
 674
 675 static void igmp6_group_added(struct ifmcaddr6 *mc)
 676 {
 677         struct net_device *dev = mc->idev->dev;
 678         char buf[MAX_ADDR_LEN];
 679
 680         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 681             IPV6_ADDR_SCOPE_LINKLOCAL)
 682                 return;
 683
 684         spin_lock_bh(&mc->mca_lock);
 685         if (!(mc->mca_flags&MAF_LOADED)) {
 686                 mc->mca_flags |= MAF_LOADED;
 687                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 688                         dev_mc_add(dev, buf);
 689         }
 690         spin_unlock_bh(&mc->mca_lock);
 691
 692         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 693                 return;
 694
 695         if (mld_in_v1_mode(mc->idev)) {
 696                 igmp6_join_group(mc);
 697                 return;
 698         }
 699         /* else v2 */
 700
 701         mc->mca_crcount = mc->idev->mc_qrv;
 702         mld_ifc_event(mc->idev);
 703 }
 704
 705 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 706 {
 707         struct net_device *dev = mc->idev->dev;
 708         char buf[MAX_ADDR_LEN];
 709
 710         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 711             IPV6_ADDR_SCOPE_LINKLOCAL)
 712                 return;
 713
 714         spin_lock_bh(&mc->mca_lock);
 715         if (mc->mca_flags&MAF_LOADED) {
 716                 mc->mca_flags &= ~MAF_LOADED;
 717                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 718                         dev_mc_del(dev, buf);
 719         }
 720
 721         if (mc->mca_flags & MAF_NOREPORT)
 722                 goto done;
 723         spin_unlock_bh(&mc->mca_lock);
 724
 725         if (!mc->idev->dead)
 726                 igmp6_leave_group(mc);
 727
 728         spin_lock_bh(&mc->mca_lock);
 729         if (del_timer(&mc->mca_timer))
 730                 atomic_dec(&mc->mca_refcnt);
 731 done:
 732         ip6_mc_clear_src(mc);
 733         spin_unlock_bh(&mc->mca_lock);
 734 }
 735
 736 /*
 737  * deleted ifmcaddr6 manipulation
 738  */
 739 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 740 {
 741         struct ifmcaddr6 *pmc;
 742
 743         /* this is an "ifmcaddr6" for convenience; only the fields below
 744          * are actually used. In particular, the refcnt and users are not
 745          * used for management of the delete list. Using the same structure
 746          * for deleted items allows change reports to use common code with
 747          * non-deleted or query-response MCA's.
 748          */
 749         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 750         if (!pmc)
 751                 return;
 752
 753         spin_lock_bh(&im->mca_lock);
 754         spin_lock_init(&pmc->mca_lock);
 755         pmc->idev = im->idev;
 756         in6_dev_hold(idev);
 757         pmc->mca_addr = im->mca_addr;
 758         pmc->mca_crcount = idev->mc_qrv;
 759         pmc->mca_sfmode = im->mca_sfmode;
 760         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 761                 struct ip6_sf_list *psf;
 762
 763                 pmc->mca_tomb = im->mca_tomb;
 764                 pmc->mca_sources = im->mca_sources;
 765                 im->mca_tomb = im->mca_sources = NULL;
 766                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
 767                         psf->sf_crcount = pmc->mca_crcount;
 768         }
 769         spin_unlock_bh(&im->mca_lock);
 770
 771         spin_lock_bh(&idev->mc_lock);
 772         pmc->next = idev->mc_tomb;
 773         idev->mc_tomb = pmc;
 774         spin_unlock_bh(&idev->mc_lock);
 775 }
 776
 777 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 778 {
 779         struct ifmcaddr6 *pmc, *pmc_prev;
 780         struct ip6_sf_list *psf, *psf_next;
 781
 782         spin_lock_bh(&idev->mc_lock);
 783         pmc_prev = NULL;
 784         for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
 785                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 786                         break;
 787                 pmc_prev = pmc;
 788         }
 789         if (pmc) {
 790                 if (pmc_prev)
 791                         pmc_prev->next = pmc->next;
 792                 else
 793                         idev->mc_tomb = pmc->next;
 794         }
 795         spin_unlock_bh(&idev->mc_lock);
 796
 797         if (pmc) {
 798                 for (psf = pmc->mca_tomb; psf; psf = psf_next) {
 799                         psf_next = psf->sf_next;
 800                         kfree(psf);
 801                 }
 802                 in6_dev_put(pmc->idev);
 803                 kfree(pmc);
 804         }
 805 }
 806
 807 static void mld_clear_delrec(struct inet6_dev *idev)
 808 {
 809         struct ifmcaddr6 *pmc, *nextpmc;
 810
 811         spin_lock_bh(&idev->mc_lock);
 812         pmc = idev->mc_tomb;
 813         idev->mc_tomb = NULL;
 814         spin_unlock_bh(&idev->mc_lock);
 815
 816         for (; pmc; pmc = nextpmc) {
 817                 nextpmc = pmc->next;
 818                 ip6_mc_clear_src(pmc);
 819                 in6_dev_put(pmc->idev);
 820                 kfree(pmc);
 821         }
 822
 823         /* clear dead sources, too */
 824         read_lock_bh(&idev->lock);
 825         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
 826                 struct ip6_sf_list *psf, *psf_next;
 827
 828                 spin_lock_bh(&pmc->mca_lock);
 829                 psf = pmc->mca_tomb;
 830                 pmc->mca_tomb = NULL;
 831                 spin_unlock_bh(&pmc->mca_lock);
 832                 for (; psf; psf = psf_next) {
 833                         psf_next = psf->sf_next;
 834                         kfree(psf);
 835                 }
 836         }
 837         read_unlock_bh(&idev->lock);
 838 }
 839
 840
 841 /*
 842  *      device multicast group inc (add if not found)
 843  */
 844 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 845 {
 846         struct ifmcaddr6 *mc;
 847         struct inet6_dev *idev;
 848
 849         /* we need to take a reference on idev */
 850         idev = in6_dev_get(dev);
 851
 852         if (idev == NULL)
 853                 return -EINVAL;
 854
 855         write_lock_bh(&idev->lock);
 856         if (idev->dead) {
 857                 write_unlock_bh(&idev->lock);
 858                 in6_dev_put(idev);
 859                 return -ENODEV;
 860         }
 861
 862         for (mc = idev->mc_list; mc; mc = mc->next) {
 863                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 864                         mc->mca_users++;
 865                         write_unlock_bh(&idev->lock);
 866                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 867                                 NULL, 0);
 868                         in6_dev_put(idev);
 869                         return 0;
 870                 }
 871         }
 872
 873         /*
 874          *      not found: create a new one.
 875          */
 876
 877         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 878
 879         if (mc == NULL) {
 880                 write_unlock_bh(&idev->lock);
 881                 in6_dev_put(idev);
 882                 return -ENOMEM;
 883         }
 884
 885         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 886
 887         mc->mca_addr = *addr;
 888         mc->idev = idev; /* (reference taken) */
 889         mc->mca_users = 1;
 890         /* mca_stamp should be updated upon changes */
 891         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 892         atomic_set(&mc->mca_refcnt, 2);
 893         spin_lock_init(&mc->mca_lock);
 894
 895         /* initial mode is (EX, empty) */
 896         mc->mca_sfmode = MCAST_EXCLUDE;
 897         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 898
 899         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 900             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 901                 mc->mca_flags |= MAF_NOREPORT;
 902
 903         mc->next = idev->mc_list;
 904         idev->mc_list = mc;
 905         write_unlock_bh(&idev->lock);
 906
 907         mld_del_delrec(idev, &mc->mca_addr);
 908         igmp6_group_added(mc);
 909         ma_put(mc);
 910         return 0;
 911 }
 912
 913 /*
 914  *      device multicast group del
 915  */
 916 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 917 {
 918         struct ifmcaddr6 *ma, **map;
 919
 920         write_lock_bh(&idev->lock);
 921         for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
 922                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 923                         if (--ma->mca_users == 0) {
 924                                 *map = ma->next;
 925                                 write_unlock_bh(&idev->lock);
 926
 927                                 igmp6_group_dropped(ma);
 928
 929                                 ma_put(ma);
 930                                 return 0;
 931                         }
 932                         write_unlock_bh(&idev->lock);
 933                         return 0;
 934                 }
 935         }
 936         write_unlock_bh(&idev->lock);
 937
 938         return -ENOENT;
 939 }
 940
 941 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 942 {
 943         struct inet6_dev *idev;
 944         int err;
 945
 946         rcu_read_lock();
 947
 948         idev = __in6_dev_get(dev);
 949         if (!idev)
 950                 err = -ENODEV;
 951         else
 952                 err = __ipv6_dev_mc_dec(idev, addr);
 953
 954         rcu_read_unlock();
 955         return err;
 956 }
 957
 958 /*
 959  *      check if the interface/address pair is valid
 960  */
 961 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 962                          const struct in6_addr *src_addr)
 963 {
 964         struct inet6_dev *idev;
 965         struct ifmcaddr6 *mc;
 966         bool rv = false;
 967
 968         rcu_read_lock();
 969         idev = __in6_dev_get(dev);
 970         if (idev) {
 971                 read_lock_bh(&idev->lock);
 972                 for (mc = idev->mc_list; mc; mc = mc->next) {
 973                         if (ipv6_addr_equal(&mc->mca_addr, group))
 974                                 break;
 975                 }
 976                 if (mc) {
 977                         if (src_addr && !ipv6_addr_any(src_addr)) {
 978                                 struct ip6_sf_list *psf;
 979
 980                                 spin_lock_bh(&mc->mca_lock);
 981                                 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
 982                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 983                                                 break;
 984                                 }
 985                                 if (psf)
 986                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 987                                                 psf->sf_count[MCAST_EXCLUDE] !=
 988                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 989                                 else
 990                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
 991                                 spin_unlock_bh(&mc->mca_lock);
 992                         } else
 993                                 rv = true; /* don't filter unspecified source */
 994                 }
 995                 read_unlock_bh(&idev->lock);
 996         }
 997         rcu_read_unlock();
 998         return rv;
 999 }
1000
1001 static void mld_gq_start_timer(struct inet6_dev *idev)
1002 {
1003         unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1004
1005         idev->mc_gq_running = 1;
1006         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1007                 in6_dev_hold(idev);
1008 }
1009
1010 static void mld_gq_stop_timer(struct inet6_dev *idev)
1011 {
1012         idev->mc_gq_running = 0;
1013         if (del_timer(&idev->mc_gq_timer))
1014                 __in6_dev_put(idev);
1015 }
1016
1017 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1018 {
1019         unsigned long tv = prandom_u32() % delay;
1020
1021         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1022                 in6_dev_hold(idev);
1023 }
1024
1025 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1026 {
1027         idev->mc_ifc_count = 0;
1028         if (del_timer(&idev->mc_ifc_timer))
1029                 __in6_dev_put(idev);
1030 }
1031
1032 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1033 {
1034         unsigned long tv = prandom_u32() % delay;
1035
1036         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1037                 in6_dev_hold(idev);
1038 }
1039
1040 static void mld_dad_stop_timer(struct inet6_dev *idev)
1041 {
1042         if (del_timer(&idev->mc_dad_timer))
1043                 __in6_dev_put(idev);
1044 }
1045
1046 /*
1047  *      IGMP handling (alias multicast ICMPv6 messages)
1048  */
1049
1050 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1051 {
1052         unsigned long delay = resptime;
1053
1054         /* Do not start timer for these addresses */
1055         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1056             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1057                 return;
1058
1059         if (del_timer(&ma->mca_timer)) {
1060                 atomic_dec(&ma->mca_refcnt);
1061                 delay = ma->mca_timer.expires - jiffies;
1062         }
1063
1064         if (delay >= resptime)
1065                 delay = prandom_u32() % resptime;
1066
1067         ma->mca_timer.expires = jiffies + delay;
1068         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1069                 atomic_inc(&ma->mca_refcnt);
1070         ma->mca_flags |= MAF_TIMER_RUNNING;
1071 }
1072
1073 /* mark EXCLUDE-mode sources */
1074 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1075                              const struct in6_addr *srcs)
1076 {
1077         struct ip6_sf_list *psf;
1078         int i, scount;
1079
1080         scount = 0;
1081         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1082                 if (scount == nsrcs)
1083                         break;
1084                 for (i = 0; i < nsrcs; i++) {
1085                         /* skip inactive filters */
1086                         if (psf->sf_count[MCAST_INCLUDE] ||
1087                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1088                             psf->sf_count[MCAST_EXCLUDE])
1089                                 break;
1090                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1091                                 scount++;
1092                                 break;
1093                         }
1094                 }
1095         }
1096         pmc->mca_flags &= ~MAF_GSQUERY;
1097         if (scount == nsrcs)    /* all sources excluded */
1098                 return false;
1099         return true;
1100 }
1101
1102 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1103                             const struct in6_addr *srcs)
1104 {
1105         struct ip6_sf_list *psf;
1106         int i, scount;
1107
1108         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1109                 return mld_xmarksources(pmc, nsrcs, srcs);
1110
1111         /* mark INCLUDE-mode sources */
1112
1113         scount = 0;
1114         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1115                 if (scount == nsrcs)
1116                         break;
1117                 for (i = 0; i < nsrcs; i++) {
1118                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1119                                 psf->sf_gsresp = 1;
1120                                 scount++;
1121                                 break;
1122                         }
1123                 }
1124         }
1125         if (!scount) {
1126                 pmc->mca_flags &= ~MAF_GSQUERY;
1127                 return false;
1128         }
1129         pmc->mca_flags |= MAF_GSQUERY;
1130         return true;
1131 }
1132
1133 static int mld_force_mld_version(const struct inet6_dev *idev)
1134 {
1135         /* Normally, both are 0 here. If enforcement to a particular is
1136          * being used, individual device enforcement will have a lower
1137          * precedence over 'all' device (.../conf/all/force_mld_version).
1138          */
1139
1140         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1141                 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1142         else
1143                 return idev->cnf.force_mld_version;
1144 }
1145
1146 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1147 {
1148         return mld_force_mld_version(idev) == 2;
1149 }
1150
1151 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1152 {
1153         return mld_force_mld_version(idev) == 1;
1154 }
1155
1156 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1157 {
1158         if (mld_in_v2_mode_only(idev))
1159                 return false;
1160         if (mld_in_v1_mode_only(idev))
1161                 return true;
1162         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1163                 return true;
1164
1165         return false;
1166 }
1167
1168 static void mld_set_v1_mode(struct inet6_dev *idev)
1169 {
1170         /* RFC3810, relevant sections:
1171          *  - 9.1. Robustness Variable
1172          *  - 9.2. Query Interval
1173          *  - 9.3. Query Response Interval
1174          *  - 9.12. Older Version Querier Present Timeout
1175          */
1176         unsigned long switchback;
1177
1178         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1179
1180         idev->mc_v1_seen = jiffies + switchback;
1181 }
1182
1183 static void mld_update_qrv(struct inet6_dev *idev,
1184                            const struct mld2_query *mlh2)
1185 {
1186         /* RFC3810, relevant sections:
1187          *  - 5.1.8. QRV (Querier's Robustness Variable)
1188          *  - 9.1. Robustness Variable
1189          */
1190
1191         /* The value of the Robustness Variable MUST NOT be zero,
1192          * and SHOULD NOT be one. Catch this here if we ever run
1193          * into such a case in future.
1194          */
1195         const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1196         WARN_ON(idev->mc_qrv == 0);
1197
1198         if (mlh2->mld2q_qrv > 0)
1199                 idev->mc_qrv = mlh2->mld2q_qrv;
1200
1201         if (unlikely(idev->mc_qrv < min_qrv)) {
1202                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1203                                      idev->mc_qrv, min_qrv);
1204                 idev->mc_qrv = min_qrv;
1205         }
1206 }
1207
1208 static void mld_update_qi(struct inet6_dev *idev,
1209                           const struct mld2_query *mlh2)
1210 {
1211         /* RFC3810, relevant sections:
1212          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1213          *  - 9.2. Query Interval
1214          *  - 9.12. Older Version Querier Present Timeout
1215          *    (the [Query Interval] in the last Query received)
1216          */
1217         unsigned long mc_qqi;
1218
1219         if (mlh2->mld2q_qqic < 128) {
1220                 mc_qqi = mlh2->mld2q_qqic;
1221         } else {
1222                 unsigned long mc_man, mc_exp;
1223
1224                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1225                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1226
1227                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1228         }
1229
1230         idev->mc_qi = mc_qqi * HZ;
1231 }
1232
1233 static void mld_update_qri(struct inet6_dev *idev,
1234                            const struct mld2_query *mlh2)
1235 {
1236         /* RFC3810, relevant sections:
1237          *  - 5.1.3. Maximum Response Code
1238          *  - 9.3. Query Response Interval
1239          */
1240         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1241 }
1242
1243 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1244                           unsigned long *max_delay)
1245 {
1246         unsigned long mldv1_md;
1247
1248         /* Ignore v1 queries */
1249         if (mld_in_v2_mode_only(idev))
1250                 return -EINVAL;
1251
1252         /* MLDv1 router present */
1253         mldv1_md = ntohs(mld->mld_maxdelay);
1254         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1255
1256         mld_set_v1_mode(idev);
1257
1258         /* cancel MLDv2 report timer */
1259         mld_gq_stop_timer(idev);
1260         /* cancel the interface change timer */
1261         mld_ifc_stop_timer(idev);
1262         /* clear deleted report items */
1263         mld_clear_delrec(idev);
1264
1265         return 0;
1266 }
1267
1268 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1269                           unsigned long *max_delay)
1270 {
1271         /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
1272         if (mld_in_v1_mode(idev))
1273                 return -EINVAL;
1274
1275         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1276
1277         mld_update_qrv(idev, mld);
1278         mld_update_qi(idev, mld);
1279         mld_update_qri(idev, mld);
1280
1281         idev->mc_maxdelay = *max_delay;
1282
1283         return 0;
1284 }
1285
1286 /* called with rcu_read_lock() */
1287 int igmp6_event_query(struct sk_buff *skb)
1288 {
1289         struct mld2_query *mlh2 = NULL;
1290         struct ifmcaddr6 *ma;
1291         const struct in6_addr *group;
1292         unsigned long max_delay;
1293         struct inet6_dev *idev;
1294         struct mld_msg *mld;
1295         int group_type;
1296         int mark = 0;
1297         int len, err;
1298
1299         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1300                 return -EINVAL;
1301
1302         /* compute payload length excluding extension headers */
1303         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1304         len -= skb_network_header_len(skb);
1305
1306         /* RFC3810 6.2
1307          * Upon reception of an MLD message that contains a Query, the node
1308          * checks if the source address of the message is a valid link-local
1309          * address, if the Hop Limit is set to 1, and if the Router Alert
1310          * option is present in the Hop-By-Hop Options header of the IPv6
1311          * packet.  If any of these checks fails, the packet is dropped.
1312          */
1313         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1314             ipv6_hdr(skb)->hop_limit != 1 ||
1315             !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1316             IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1317                 return -EINVAL;
1318
1319         idev = __in6_dev_get(skb->dev);
1320         if (idev == NULL)
1321                 return 0;
1322
1323         mld = (struct mld_msg *)icmp6_hdr(skb);
1324         group = &mld->mld_mca;
1325         group_type = ipv6_addr_type(group);
1326
1327         if (group_type != IPV6_ADDR_ANY &&
1328             !(group_type&IPV6_ADDR_MULTICAST))
1329                 return -EINVAL;
1330
1331         if (len == MLD_V1_QUERY_LEN) {
1332                 err = mld_process_v1(idev, mld, &max_delay);
1333                 if (err < 0)
1334                         return err;
1335         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1336                 int srcs_offset = sizeof(struct mld2_query) -
1337                                   sizeof(struct icmp6hdr);
1338
1339                 if (!pskb_may_pull(skb, srcs_offset))
1340                         return -EINVAL;
1341
1342                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1343
1344                 err = mld_process_v2(idev, mlh2, &max_delay);
1345                 if (err < 0)
1346                         return err;
1347
1348                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1349                         if (mlh2->mld2q_nsrcs)
1350                                 return -EINVAL; /* no sources allowed */
1351
1352                         mld_gq_start_timer(idev);
1353                         return 0;
1354                 }
1355                 /* mark sources to include, if group & source-specific */
1356                 if (mlh2->mld2q_nsrcs != 0) {
1357                         if (!pskb_may_pull(skb, srcs_offset +
1358                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1359                                 return -EINVAL;
1360
1361                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1362                         mark = 1;
1363                 }
1364         } else
1365                 return -EINVAL;
1366
1367         read_lock_bh(&idev->lock);
1368         if (group_type == IPV6_ADDR_ANY) {
1369                 for (ma = idev->mc_list; ma; ma = ma->next) {
1370                         spin_lock_bh(&ma->mca_lock);
1371                         igmp6_group_queried(ma, max_delay);
1372                         spin_unlock_bh(&ma->mca_lock);
1373                 }
1374         } else {
1375                 for (ma = idev->mc_list; ma; ma = ma->next) {
1376                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1377                                 continue;
1378                         spin_lock_bh(&ma->mca_lock);
1379                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1380                                 /* gsquery <- gsquery && mark */
1381                                 if (!mark)
1382                                         ma->mca_flags &= ~MAF_GSQUERY;
1383                         } else {
1384                                 /* gsquery <- mark */
1385                                 if (mark)
1386                                         ma->mca_flags |= MAF_GSQUERY;
1387                                 else
1388                                         ma->mca_flags &= ~MAF_GSQUERY;
1389                         }
1390                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1391                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1392                                 igmp6_group_queried(ma, max_delay);
1393                         spin_unlock_bh(&ma->mca_lock);
1394                         break;
1395                 }
1396         }
1397         read_unlock_bh(&idev->lock);
1398
1399         return 0;
1400 }
1401
1402 /* called with rcu_read_lock() */
1403 int igmp6_event_report(struct sk_buff *skb)
1404 {
1405         struct ifmcaddr6 *ma;
1406         struct inet6_dev *idev;
1407         struct mld_msg *mld;
1408         int addr_type;
1409
1410         /* Our own report looped back. Ignore it. */
1411         if (skb->pkt_type == PACKET_LOOPBACK)
1412                 return 0;
1413
1414         /* send our report if the MC router may not have heard this report */
1415         if (skb->pkt_type != PACKET_MULTICAST &&
1416             skb->pkt_type != PACKET_BROADCAST)
1417                 return 0;
1418
1419         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1420                 return -EINVAL;
1421
1422         mld = (struct mld_msg *)icmp6_hdr(skb);
1423
1424         /* Drop reports with not link local source */
1425         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1426         if (addr_type != IPV6_ADDR_ANY &&
1427             !(addr_type&IPV6_ADDR_LINKLOCAL))
1428                 return -EINVAL;
1429
1430         idev = __in6_dev_get(skb->dev);
1431         if (idev == NULL)
1432                 return -ENODEV;
1433
1434         /*
1435          *      Cancel the timer for this group
1436          */
1437
1438         read_lock_bh(&idev->lock);
1439         for (ma = idev->mc_list; ma; ma = ma->next) {
1440                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1441                         spin_lock(&ma->mca_lock);
1442                         if (del_timer(&ma->mca_timer))
1443                                 atomic_dec(&ma->mca_refcnt);
1444                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1445                         spin_unlock(&ma->mca_lock);
1446                         break;
1447                 }
1448         }
1449         read_unlock_bh(&idev->lock);
1450         return 0;
1451 }
1452
1453 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1454                   int gdeleted, int sdeleted)
1455 {
1456         switch (type) {
1457         case MLD2_MODE_IS_INCLUDE:
1458         case MLD2_MODE_IS_EXCLUDE:
1459                 if (gdeleted || sdeleted)
1460                         return false;
1461                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1462                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1463                                 return true;
1464                         /* don't include if this source is excluded
1465                          * in all filters
1466                          */
1467                         if (psf->sf_count[MCAST_INCLUDE])
1468                                 return type == MLD2_MODE_IS_INCLUDE;
1469                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1470                                 psf->sf_count[MCAST_EXCLUDE];
1471                 }
1472                 return false;
1473         case MLD2_CHANGE_TO_INCLUDE:
1474                 if (gdeleted || sdeleted)
1475                         return false;
1476                 return psf->sf_count[MCAST_INCLUDE] != 0;
1477         case MLD2_CHANGE_TO_EXCLUDE:
1478                 if (gdeleted || sdeleted)
1479                         return false;
1480                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1481                     psf->sf_count[MCAST_INCLUDE])
1482                         return false;
1483                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1484                         psf->sf_count[MCAST_EXCLUDE];
1485         case MLD2_ALLOW_NEW_SOURCES:
1486                 if (gdeleted || !psf->sf_crcount)
1487                         return false;
1488                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1489         case MLD2_BLOCK_OLD_SOURCES:
1490                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1491                         return gdeleted || (psf->sf_crcount && sdeleted);
1492                 return psf->sf_crcount && !gdeleted && !sdeleted;
1493         }
1494         return false;
1495 }
1496
1497 static int
1498 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1499 {
1500         struct ip6_sf_list *psf;
1501         int scount = 0;
1502
1503         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1504                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1505                         continue;
1506                 scount++;
1507         }
1508         return scount;
1509 }
1510
1511 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1512                        struct net_device *dev,
1513                        const struct in6_addr *saddr,
1514                        const struct in6_addr *daddr,
1515                        int proto, int len)
1516 {
1517         struct ipv6hdr *hdr;
1518
1519         skb->protocol = htons(ETH_P_IPV6);
1520         skb->dev = dev;
1521
1522         skb_reset_network_header(skb);
1523         skb_put(skb, sizeof(struct ipv6hdr));
1524         hdr = ipv6_hdr(skb);
1525
1526         ip6_flow_hdr(hdr, 0, 0);
1527
1528         hdr->payload_len = htons(len);
1529         hdr->nexthdr = proto;
1530         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1531
1532         hdr->saddr = *saddr;
1533         hdr->daddr = *daddr;
1534 }
1535
1536 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1537 {
1538         struct net_device *dev = idev->dev;
1539         struct net *net = dev_net(dev);
1540         struct sock *sk = net->ipv6.igmp_sk;
1541         struct sk_buff *skb;
1542         struct mld2_report *pmr;
1543         struct in6_addr addr_buf;
1544         const struct in6_addr *saddr;
1545         int hlen = LL_RESERVED_SPACE(dev);
1546         int tlen = dev->needed_tailroom;
1547         int err;
1548         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1549                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1550                      IPV6_TLV_PADN, 0 };
1551
1552         /* we assume size > sizeof(ra) here */
1553         size += hlen + tlen;
1554         /* limit our allocations to order-0 page */
1555         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1556         skb = sock_alloc_send_skb(sk, size, 1, &err);
1557
1558         if (!skb)
1559                 return NULL;
1560
1561         skb->priority = TC_PRIO_CONTROL;
1562         skb_reserve(skb, hlen);
1563
1564         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1565                 /* <draft-ietf-magma-mld-source-05.txt>:
1566                  * use unspecified address as the source address
1567                  * when a valid link-local address is not available.
1568                  */
1569                 saddr = &in6addr_any;
1570         } else
1571                 saddr = &addr_buf;
1572
1573         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1574
1575         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1576
1577         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1578         skb_put(skb, sizeof(*pmr));
1579         pmr = (struct mld2_report *)skb_transport_header(skb);
1580         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1581         pmr->mld2r_resv1 = 0;
1582         pmr->mld2r_cksum = 0;
1583         pmr->mld2r_resv2 = 0;
1584         pmr->mld2r_ngrec = 0;
1585         return skb;
1586 }
1587
1588 static void mld_sendpack(struct sk_buff *skb)
1589 {
1590         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1591         struct mld2_report *pmr =
1592                               (struct mld2_report *)skb_transport_header(skb);
1593         int payload_len, mldlen;
1594         struct inet6_dev *idev;
1595         struct net *net = dev_net(skb->dev);
1596         int err;
1597         struct flowi6 fl6;
1598         struct dst_entry *dst;
1599
1600         rcu_read_lock();
1601         idev = __in6_dev_get(skb->dev);
1602         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1603
1604         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1605                 sizeof(*pip6);
1606         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1607         pip6->payload_len = htons(payload_len);
1608
1609         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1610                                            IPPROTO_ICMPV6,
1611                                            csum_partial(skb_transport_header(skb),
1612                                                         mldlen, 0));
1613
1614         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1615                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1616                          skb->dev->ifindex);
1617         dst = icmp6_dst_alloc(skb->dev, &fl6);
1618
1619         err = 0;
1620         if (IS_ERR(dst)) {
1621                 err = PTR_ERR(dst);
1622                 dst = NULL;
1623         }
1624         skb_dst_set(skb, dst);
1625         if (err)
1626                 goto err_out;
1627
1628         payload_len = skb->len;
1629
1630         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1631                       dst_output);
1632 out:
1633         if (!err) {
1634                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1635                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1636                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1637         } else {
1638                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1639         }
1640
1641         rcu_read_unlock();
1642         return;
1643
1644 err_out:
1645         kfree_skb(skb);
1646         goto out;
1647 }
1648
1649 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1650 {
1651         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1652 }
1653
1654 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1655         int type, struct mld2_grec **ppgr)
1656 {
1657         struct net_device *dev = pmc->idev->dev;
1658         struct mld2_report *pmr;
1659         struct mld2_grec *pgr;
1660
1661         if (!skb)
1662                 skb = mld_newpack(pmc->idev, dev->mtu);
1663         if (!skb)
1664                 return NULL;
1665         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1666         pgr->grec_type = type;
1667         pgr->grec_auxwords = 0;
1668         pgr->grec_nsrcs = 0;
1669         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1670         pmr = (struct mld2_report *)skb_transport_header(skb);
1671         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1672         *ppgr = pgr;
1673         return skb;
1674 }
1675
1676 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1677         skb_tailroom(skb)) : 0)
1678
1679 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1680         int type, int gdeleted, int sdeleted, int crsend)
1681 {
1682         struct inet6_dev *idev = pmc->idev;
1683         struct net_device *dev = idev->dev;
1684         struct mld2_report *pmr;
1685         struct mld2_grec *pgr = NULL;
1686         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1687         int scount, stotal, first, isquery, truncate;
1688
1689         if (pmc->mca_flags & MAF_NOREPORT)
1690                 return skb;
1691
1692         isquery = type == MLD2_MODE_IS_INCLUDE ||
1693                   type == MLD2_MODE_IS_EXCLUDE;
1694         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1695                     type == MLD2_CHANGE_TO_EXCLUDE;
1696
1697         stotal = scount = 0;
1698
1699         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1700
1701         if (!*psf_list)
1702                 goto empty_source;
1703
1704         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1705
1706         /* EX and TO_EX get a fresh packet, if needed */
1707         if (truncate) {
1708                 if (pmr && pmr->mld2r_ngrec &&
1709                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1710                         if (skb)
1711                                 mld_sendpack(skb);
1712                         skb = mld_newpack(idev, dev->mtu);
1713                 }
1714         }
1715         first = 1;
1716         psf_prev = NULL;
1717         for (psf = *psf_list; psf; psf = psf_next) {
1718                 struct in6_addr *psrc;
1719
1720                 psf_next = psf->sf_next;
1721
1722                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1723                         psf_prev = psf;
1724                         continue;
1725                 }
1726
1727                 /* clear marks on query responses */
1728                 if (isquery)
1729                         psf->sf_gsresp = 0;
1730
1731                 if (AVAILABLE(skb) < sizeof(*psrc) +
1732                     first*sizeof(struct mld2_grec)) {
1733                         if (truncate && !first)
1734                                 break;   /* truncate these */
1735                         if (pgr)
1736                                 pgr->grec_nsrcs = htons(scount);
1737                         if (skb)
1738                                 mld_sendpack(skb);
1739                         skb = mld_newpack(idev, dev->mtu);
1740                         first = 1;
1741                         scount = 0;
1742                 }
1743                 if (first) {
1744                         skb = add_grhead(skb, pmc, type, &pgr);
1745                         first = 0;
1746                 }
1747                 if (!skb)
1748                         return NULL;
1749                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1750                 *psrc = psf->sf_addr;
1751                 scount++; stotal++;
1752                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1753                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1754                         psf->sf_crcount--;
1755                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1756                                 if (psf_prev)
1757                                         psf_prev->sf_next = psf->sf_next;
1758                                 else
1759                                         *psf_list = psf->sf_next;
1760                                 kfree(psf);
1761                                 continue;
1762                         }
1763                 }
1764                 psf_prev = psf;
1765         }
1766
1767 empty_source:
1768         if (!stotal) {
1769                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1770                     type == MLD2_BLOCK_OLD_SOURCES)
1771                         return skb;
1772                 if (pmc->mca_crcount || isquery || crsend) {
1773                         /* make sure we have room for group header */
1774                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1775                                 mld_sendpack(skb);
1776                                 skb = NULL; /* add_grhead will get a new one */
1777                         }
1778                         skb = add_grhead(skb, pmc, type, &pgr);
1779                 }
1780         }
1781         if (pgr)
1782                 pgr->grec_nsrcs = htons(scount);
1783
1784         if (isquery)
1785                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1786         return skb;
1787 }
1788
1789 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1790 {
1791         struct sk_buff *skb = NULL;
1792         int type;
1793
1794         read_lock_bh(&idev->lock);
1795         if (!pmc) {
1796                 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1797                         if (pmc->mca_flags & MAF_NOREPORT)
1798                                 continue;
1799                         spin_lock_bh(&pmc->mca_lock);
1800                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1801                                 type = MLD2_MODE_IS_EXCLUDE;
1802                         else
1803                                 type = MLD2_MODE_IS_INCLUDE;
1804                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1805                         spin_unlock_bh(&pmc->mca_lock);
1806                 }
1807         } else {
1808                 spin_lock_bh(&pmc->mca_lock);
1809                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1810                         type = MLD2_MODE_IS_EXCLUDE;
1811                 else
1812                         type = MLD2_MODE_IS_INCLUDE;
1813                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1814                 spin_unlock_bh(&pmc->mca_lock);
1815         }
1816         read_unlock_bh(&idev->lock);
1817         if (skb)
1818                 mld_sendpack(skb);
1819 }
1820
1821 /*
1822  * remove zero-count source records from a source filter list
1823  */
1824 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1825 {
1826         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1827
1828         psf_prev = NULL;
1829         for (psf = *ppsf; psf; psf = psf_next) {
1830                 psf_next = psf->sf_next;
1831                 if (psf->sf_crcount == 0) {
1832                         if (psf_prev)
1833                                 psf_prev->sf_next = psf->sf_next;
1834                         else
1835                                 *ppsf = psf->sf_next;
1836                         kfree(psf);
1837                 } else
1838                         psf_prev = psf;
1839         }
1840 }
1841
1842 static void mld_send_cr(struct inet6_dev *idev)
1843 {
1844         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1845         struct sk_buff *skb = NULL;
1846         int type, dtype;
1847
1848         read_lock_bh(&idev->lock);
1849         spin_lock(&idev->mc_lock);
1850
1851         /* deleted MCA's */
1852         pmc_prev = NULL;
1853         for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1854                 pmc_next = pmc->next;
1855                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1856                         type = MLD2_BLOCK_OLD_SOURCES;
1857                         dtype = MLD2_BLOCK_OLD_SOURCES;
1858                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1859                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1860                 }
1861                 if (pmc->mca_crcount) {
1862                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1863                                 type = MLD2_CHANGE_TO_INCLUDE;
1864                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1865                         }
1866                         pmc->mca_crcount--;
1867                         if (pmc->mca_crcount == 0) {
1868                                 mld_clear_zeros(&pmc->mca_tomb);
1869                                 mld_clear_zeros(&pmc->mca_sources);
1870                         }
1871                 }
1872                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1873                     !pmc->mca_sources) {
1874                         if (pmc_prev)
1875                                 pmc_prev->next = pmc_next;
1876                         else
1877                                 idev->mc_tomb = pmc_next;
1878                         in6_dev_put(pmc->idev);
1879                         kfree(pmc);
1880                 } else
1881                         pmc_prev = pmc;
1882         }
1883         spin_unlock(&idev->mc_lock);
1884
1885         /* change recs */
1886         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1887                 spin_lock_bh(&pmc->mca_lock);
1888                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1889                         type = MLD2_BLOCK_OLD_SOURCES;
1890                         dtype = MLD2_ALLOW_NEW_SOURCES;
1891                 } else {
1892                         type = MLD2_ALLOW_NEW_SOURCES;
1893                         dtype = MLD2_BLOCK_OLD_SOURCES;
1894                 }
1895                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1896                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1897
1898                 /* filter mode changes */
1899                 if (pmc->mca_crcount) {
1900                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1901                                 type = MLD2_CHANGE_TO_EXCLUDE;
1902                         else
1903                                 type = MLD2_CHANGE_TO_INCLUDE;
1904                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1905                         pmc->mca_crcount--;
1906                 }
1907                 spin_unlock_bh(&pmc->mca_lock);
1908         }
1909         read_unlock_bh(&idev->lock);
1910         if (!skb)
1911                 return;
1912         (void) mld_sendpack(skb);
1913 }
1914
1915 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1916 {
1917         struct net *net = dev_net(dev);
1918         struct sock *sk = net->ipv6.igmp_sk;
1919         struct inet6_dev *idev;
1920         struct sk_buff *skb;
1921         struct mld_msg *hdr;
1922         const struct in6_addr *snd_addr, *saddr;
1923         struct in6_addr addr_buf;
1924         int hlen = LL_RESERVED_SPACE(dev);
1925         int tlen = dev->needed_tailroom;
1926         int err, len, payload_len, full_len;
1927         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1928                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1929                      IPV6_TLV_PADN, 0 };
1930         struct flowi6 fl6;
1931         struct dst_entry *dst;
1932
1933         if (type == ICMPV6_MGM_REDUCTION)
1934                 snd_addr = &in6addr_linklocal_allrouters;
1935         else
1936                 snd_addr = addr;
1937
1938         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1939         payload_len = len + sizeof(ra);
1940         full_len = sizeof(struct ipv6hdr) + payload_len;
1941
1942         rcu_read_lock();
1943         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1944                       IPSTATS_MIB_OUT, full_len);
1945         rcu_read_unlock();
1946
1947         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1948
1949         if (skb == NULL) {
1950                 rcu_read_lock();
1951                 IP6_INC_STATS(net, __in6_dev_get(dev),
1952                               IPSTATS_MIB_OUTDISCARDS);
1953                 rcu_read_unlock();
1954                 return;
1955         }
1956         skb->priority = TC_PRIO_CONTROL;
1957         skb_reserve(skb, hlen);
1958
1959         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1960                 /* <draft-ietf-magma-mld-source-05.txt>:
1961                  * use unspecified address as the source address
1962                  * when a valid link-local address is not available.
1963                  */
1964                 saddr = &in6addr_any;
1965         } else
1966                 saddr = &addr_buf;
1967
1968         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1969
1970         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1971
1972         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1973         memset(hdr, 0, sizeof(struct mld_msg));
1974         hdr->mld_type = type;
1975         hdr->mld_mca = *addr;
1976
1977         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1978                                          IPPROTO_ICMPV6,
1979                                          csum_partial(hdr, len, 0));
1980
1981         rcu_read_lock();
1982         idev = __in6_dev_get(skb->dev);
1983
1984         icmpv6_flow_init(sk, &fl6, type,
1985                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1986                          skb->dev->ifindex);
1987         dst = icmp6_dst_alloc(skb->dev, &fl6);
1988         if (IS_ERR(dst)) {
1989                 err = PTR_ERR(dst);
1990                 goto err_out;
1991         }
1992
1993         skb_dst_set(skb, dst);
1994         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1995                       dst_output);
1996 out:
1997         if (!err) {
1998                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1999                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2000                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
2001         } else
2002                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2003
2004         rcu_read_unlock();
2005         return;
2006
2007 err_out:
2008         kfree_skb(skb);
2009         goto out;
2010 }
2011
2012 static void mld_send_initial_cr(struct inet6_dev *idev)
2013 {
2014         struct sk_buff *skb;
2015         struct ifmcaddr6 *pmc;
2016         int type;
2017
2018         if (mld_in_v1_mode(idev))
2019                 return;
2020
2021         skb = NULL;
2022         read_lock_bh(&idev->lock);
2023         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2024                 spin_lock_bh(&pmc->mca_lock);
2025                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2026                         type = MLD2_CHANGE_TO_EXCLUDE;
2027                 else
2028                         type = MLD2_CHANGE_TO_INCLUDE;
2029                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2030                 spin_unlock_bh(&pmc->mca_lock);
2031         }
2032         read_unlock_bh(&idev->lock);
2033         if (skb)
2034                 mld_sendpack(skb);
2035 }
2036
2037 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2038 {
2039         idev->mc_dad_count = idev->mc_qrv;
2040         if (idev->mc_dad_count) {
2041                 mld_send_initial_cr(idev);
2042                 idev->mc_dad_count--;
2043                 if (idev->mc_dad_count)
2044                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2045         }
2046 }
2047
2048 static void mld_dad_timer_expire(unsigned long data)
2049 {
2050         struct inet6_dev *idev = (struct inet6_dev *)data;
2051
2052         mld_send_initial_cr(idev);
2053         if (idev->mc_dad_count) {
2054                 idev->mc_dad_count--;
2055                 if (idev->mc_dad_count)
2056                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2057         }
2058         in6_dev_put(idev);
2059 }
2060
2061 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2062         const struct in6_addr *psfsrc)
2063 {
2064         struct ip6_sf_list *psf, *psf_prev;
2065         int rv = 0;
2066
2067         psf_prev = NULL;
2068         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2069                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2070                         break;
2071                 psf_prev = psf;
2072         }
2073         if (!psf || psf->sf_count[sfmode] == 0) {
2074                 /* source filter not found, or count wrong =>  bug */
2075                 return -ESRCH;
2076         }
2077         psf->sf_count[sfmode]--;
2078         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2079                 struct inet6_dev *idev = pmc->idev;
2080
2081                 /* no more filters for this source */
2082                 if (psf_prev)
2083                         psf_prev->sf_next = psf->sf_next;
2084                 else
2085                         pmc->mca_sources = psf->sf_next;
2086                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2087                     !mld_in_v1_mode(idev)) {
2088                         psf->sf_crcount = idev->mc_qrv;
2089                         psf->sf_next = pmc->mca_tomb;
2090                         pmc->mca_tomb = psf;
2091                         rv = 1;
2092                 } else
2093                         kfree(psf);
2094         }
2095         return rv;
2096 }
2097
2098 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2099                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2100                           int delta)
2101 {
2102         struct ifmcaddr6 *pmc;
2103         int     changerec = 0;
2104         int     i, err;
2105
2106         if (!idev)
2107                 return -ENODEV;
2108         read_lock_bh(&idev->lock);
2109         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2110                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2111                         break;
2112         }
2113         if (!pmc) {
2114                 /* MCA not found?? bug */
2115                 read_unlock_bh(&idev->lock);
2116                 return -ESRCH;
2117         }
2118         spin_lock_bh(&pmc->mca_lock);
2119         sf_markstate(pmc);
2120         if (!delta) {
2121                 if (!pmc->mca_sfcount[sfmode]) {
2122                         spin_unlock_bh(&pmc->mca_lock);
2123                         read_unlock_bh(&idev->lock);
2124                         return -EINVAL;
2125                 }
2126                 pmc->mca_sfcount[sfmode]--;
2127         }
2128         err = 0;
2129         for (i = 0; i < sfcount; i++) {
2130                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2131
2132                 changerec |= rv > 0;
2133                 if (!err && rv < 0)
2134                         err = rv;
2135         }
2136         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2137             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2138             pmc->mca_sfcount[MCAST_INCLUDE]) {
2139                 struct ip6_sf_list *psf;
2140
2141                 /* filter mode change */
2142                 pmc->mca_sfmode = MCAST_INCLUDE;
2143                 pmc->mca_crcount = idev->mc_qrv;
2144                 idev->mc_ifc_count = pmc->mca_crcount;
2145                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2146                         psf->sf_crcount = 0;
2147                 mld_ifc_event(pmc->idev);
2148         } else if (sf_setstate(pmc) || changerec)
2149                 mld_ifc_event(pmc->idev);
2150         spin_unlock_bh(&pmc->mca_lock);
2151         read_unlock_bh(&idev->lock);
2152         return err;
2153 }
2154
2155 /*
2156  * Add multicast single-source filter to the interface list
2157  */
2158 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2159         const struct in6_addr *psfsrc)
2160 {
2161         struct ip6_sf_list *psf, *psf_prev;
2162
2163         psf_prev = NULL;
2164         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2165                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2166                         break;
2167                 psf_prev = psf;
2168         }
2169         if (!psf) {
2170                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2171                 if (!psf)
2172                         return -ENOBUFS;
2173
2174                 psf->sf_addr = *psfsrc;
2175                 if (psf_prev) {
2176                         psf_prev->sf_next = psf;
2177                 } else
2178                         pmc->mca_sources = psf;
2179         }
2180         psf->sf_count[sfmode]++;
2181         return 0;
2182 }
2183
2184 static void sf_markstate(struct ifmcaddr6 *pmc)
2185 {
2186         struct ip6_sf_list *psf;
2187         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2188
2189         for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2190                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2191                         psf->sf_oldin = mca_xcount ==
2192                                 psf->sf_count[MCAST_EXCLUDE] &&
2193                                 !psf->sf_count[MCAST_INCLUDE];
2194                 } else
2195                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2196 }
2197
2198 static int sf_setstate(struct ifmcaddr6 *pmc)
2199 {
2200         struct ip6_sf_list *psf, *dpsf;
2201         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2202         int qrv = pmc->idev->mc_qrv;
2203         int new_in, rv;
2204
2205         rv = 0;
2206         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2207                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2208                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2209                                 !psf->sf_count[MCAST_INCLUDE];
2210                 } else
2211                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2212                 if (new_in) {
2213                         if (!psf->sf_oldin) {
2214                                 struct ip6_sf_list *prev = NULL;
2215
2216                                 for (dpsf = pmc->mca_tomb; dpsf;
2217                                      dpsf = dpsf->sf_next) {
2218                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2219                                             &psf->sf_addr))
2220                                                 break;
2221                                         prev = dpsf;
2222                                 }
2223                                 if (dpsf) {
2224                                         if (prev)
2225                                                 prev->sf_next = dpsf->sf_next;
2226                                         else
2227                                                 pmc->mca_tomb = dpsf->sf_next;
2228                                         kfree(dpsf);
2229                                 }
2230                                 psf->sf_crcount = qrv;
2231                                 rv++;
2232                         }
2233                 } else if (psf->sf_oldin) {
2234                         psf->sf_crcount = 0;
2235                         /*
2236                          * add or update "delete" records if an active filter
2237                          * is now inactive
2238                          */
2239                         for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2240                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2241                                     &psf->sf_addr))
2242                                         break;
2243                         if (!dpsf) {
2244                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2245                                 if (!dpsf)
2246                                         continue;
2247                                 *dpsf = *psf;
2248                                 /* pmc->mca_lock held by callers */
2249                                 dpsf->sf_next = pmc->mca_tomb;
2250                                 pmc->mca_tomb = dpsf;
2251                         }
2252                         dpsf->sf_crcount = qrv;
2253                         rv++;
2254                 }
2255         }
2256         return rv;
2257 }
2258
2259 /*
2260  * Add multicast source filter list to the interface list
2261  */
2262 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2263                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2264                           int delta)
2265 {
2266         struct ifmcaddr6 *pmc;
2267         int     isexclude;
2268         int     i, err;
2269
2270         if (!idev)
2271                 return -ENODEV;
2272         read_lock_bh(&idev->lock);
2273         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2274                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2275                         break;
2276         }
2277         if (!pmc) {
2278                 /* MCA not found?? bug */
2279                 read_unlock_bh(&idev->lock);
2280                 return -ESRCH;
2281         }
2282         spin_lock_bh(&pmc->mca_lock);
2283
2284         sf_markstate(pmc);
2285         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2286         if (!delta)
2287                 pmc->mca_sfcount[sfmode]++;
2288         err = 0;
2289         for (i = 0; i < sfcount; i++) {
2290                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2291                 if (err)
2292                         break;
2293         }
2294         if (err) {
2295                 int j;
2296
2297                 if (!delta)
2298                         pmc->mca_sfcount[sfmode]--;
2299                 for (j = 0; j < i; j++)
2300                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2301         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2302                 struct ip6_sf_list *psf;
2303
2304                 /* filter mode change */
2305                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2306                         pmc->mca_sfmode = MCAST_EXCLUDE;
2307                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2308                         pmc->mca_sfmode = MCAST_INCLUDE;
2309                 /* else no filters; keep old mode for reports */
2310
2311                 pmc->mca_crcount = idev->mc_qrv;
2312                 idev->mc_ifc_count = pmc->mca_crcount;
2313                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2314                         psf->sf_crcount = 0;
2315                 mld_ifc_event(idev);
2316         } else if (sf_setstate(pmc))
2317                 mld_ifc_event(idev);
2318         spin_unlock_bh(&pmc->mca_lock);
2319         read_unlock_bh(&idev->lock);
2320         return err;
2321 }
2322
2323 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2324 {
2325         struct ip6_sf_list *psf, *nextpsf;
2326
2327         for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2328                 nextpsf = psf->sf_next;
2329                 kfree(psf);
2330         }
2331         pmc->mca_tomb = NULL;
2332         for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2333                 nextpsf = psf->sf_next;
2334                 kfree(psf);
2335         }
2336         pmc->mca_sources = NULL;
2337         pmc->mca_sfmode = MCAST_EXCLUDE;
2338         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2339         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2340 }
2341
2342
2343 static void igmp6_join_group(struct ifmcaddr6 *ma)
2344 {
2345         unsigned long delay;
2346
2347         if (ma->mca_flags & MAF_NOREPORT)
2348                 return;
2349
2350         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2351
2352         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2353
2354         spin_lock_bh(&ma->mca_lock);
2355         if (del_timer(&ma->mca_timer)) {
2356                 atomic_dec(&ma->mca_refcnt);
2357                 delay = ma->mca_timer.expires - jiffies;
2358         }
2359
2360         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2361                 atomic_inc(&ma->mca_refcnt);
2362         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2363         spin_unlock_bh(&ma->mca_lock);
2364 }
2365
2366 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2367                             struct inet6_dev *idev)
2368 {
2369         int err;
2370
2371         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2372          * so no other readers or writers of iml or its sflist
2373          */
2374         if (!iml->sflist) {
2375                 /* any-source empty exclude case */
2376                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2377         }
2378         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2379                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2380         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2381         iml->sflist = NULL;
2382         return err;
2383 }
2384
2385 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2386 {
2387         if (mld_in_v1_mode(ma->idev)) {
2388                 if (ma->mca_flags & MAF_LAST_REPORTER)
2389                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2390                                 ICMPV6_MGM_REDUCTION);
2391         } else {
2392                 mld_add_delrec(ma->idev, ma);
2393                 mld_ifc_event(ma->idev);
2394         }
2395 }
2396
2397 static void mld_gq_timer_expire(unsigned long data)
2398 {
2399         struct inet6_dev *idev = (struct inet6_dev *)data;
2400
2401         idev->mc_gq_running = 0;
2402         mld_send_report(idev, NULL);
2403         in6_dev_put(idev);
2404 }
2405
2406 static void mld_ifc_timer_expire(unsigned long data)
2407 {
2408         struct inet6_dev *idev = (struct inet6_dev *)data;
2409
2410         mld_send_cr(idev);
2411         if (idev->mc_ifc_count) {
2412                 idev->mc_ifc_count--;
2413                 if (idev->mc_ifc_count)
2414                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2415         }
2416         in6_dev_put(idev);
2417 }
2418
2419 static void mld_ifc_event(struct inet6_dev *idev)
2420 {
2421         if (mld_in_v1_mode(idev))
2422                 return;
2423         idev->mc_ifc_count = idev->mc_qrv;
2424         mld_ifc_start_timer(idev, 1);
2425 }
2426
2427
2428 static void igmp6_timer_handler(unsigned long data)
2429 {
2430         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2431
2432         if (mld_in_v1_mode(ma->idev))
2433                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2434         else
2435                 mld_send_report(ma->idev, ma);
2436
2437         spin_lock(&ma->mca_lock);
2438         ma->mca_flags |=  MAF_LAST_REPORTER;
2439         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2440         spin_unlock(&ma->mca_lock);
2441         ma_put(ma);
2442 }
2443
2444 /* Device changing type */
2445
2446 void ipv6_mc_unmap(struct inet6_dev *idev)
2447 {
2448         struct ifmcaddr6 *i;
2449
2450         /* Install multicast list, except for all-nodes (already installed) */
2451
2452         read_lock_bh(&idev->lock);
2453         for (i = idev->mc_list; i; i = i->next)
2454                 igmp6_group_dropped(i);
2455         read_unlock_bh(&idev->lock);
2456 }
2457
2458 void ipv6_mc_remap(struct inet6_dev *idev)
2459 {
2460         ipv6_mc_up(idev);
2461 }
2462
2463 /* Device going down */
2464
2465 void ipv6_mc_down(struct inet6_dev *idev)
2466 {
2467         struct ifmcaddr6 *i;
2468
2469         /* Withdraw multicast list */
2470
2471         read_lock_bh(&idev->lock);
2472         mld_ifc_stop_timer(idev);
2473         mld_gq_stop_timer(idev);
2474         mld_dad_stop_timer(idev);
2475
2476         for (i = idev->mc_list; i; i = i->next)
2477                 igmp6_group_dropped(i);
2478         read_unlock_bh(&idev->lock);
2479
2480         mld_clear_delrec(idev);
2481 }
2482
2483 static void ipv6_mc_reset(struct inet6_dev *idev)
2484 {
2485         idev->mc_qrv = sysctl_mld_qrv;
2486         idev->mc_qi = MLD_QI_DEFAULT;
2487         idev->mc_qri = MLD_QRI_DEFAULT;
2488         idev->mc_v1_seen = 0;
2489         idev->mc_maxdelay = unsolicited_report_interval(idev);
2490 }
2491
2492 /* Device going up */
2493
2494 void ipv6_mc_up(struct inet6_dev *idev)
2495 {
2496         struct ifmcaddr6 *i;
2497
2498         /* Install multicast list, except for all-nodes (already installed) */
2499
2500         read_lock_bh(&idev->lock);
2501         ipv6_mc_reset(idev);
2502         for (i = idev->mc_list; i; i = i->next)
2503                 igmp6_group_added(i);
2504         read_unlock_bh(&idev->lock);
2505 }
2506
2507 /* IPv6 device initialization. */
2508
2509 void ipv6_mc_init_dev(struct inet6_dev *idev)
2510 {
2511         write_lock_bh(&idev->lock);
2512         spin_lock_init(&idev->mc_lock);
2513         idev->mc_gq_running = 0;
2514         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2515                         (unsigned long)idev);
2516         idev->mc_tomb = NULL;
2517         idev->mc_ifc_count = 0;
2518         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2519                         (unsigned long)idev);
2520         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2521                     (unsigned long)idev);
2522         ipv6_mc_reset(idev);
2523         write_unlock_bh(&idev->lock);
2524 }
2525
2526 /*
2527  *      Device is about to be destroyed: clean up.
2528  */
2529
2530 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2531 {
2532         struct ifmcaddr6 *i;
2533
2534         /* Deactivate timers */
2535         ipv6_mc_down(idev);
2536
2537         /* Delete all-nodes address. */
2538         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2539          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2540          * fail.
2541          */
2542         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2543
2544         if (idev->cnf.forwarding)
2545                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2546
2547         write_lock_bh(&idev->lock);
2548         while ((i = idev->mc_list) != NULL) {
2549                 idev->mc_list = i->next;
2550                 write_unlock_bh(&idev->lock);
2551
2552                 igmp6_group_dropped(i);
2553                 ma_put(i);
2554
2555                 write_lock_bh(&idev->lock);
2556         }
2557         write_unlock_bh(&idev->lock);
2558 }
2559
2560 #ifdef CONFIG_PROC_FS
2561 struct igmp6_mc_iter_state {
2562         struct seq_net_private p;
2563         struct net_device *dev;
2564         struct inet6_dev *idev;
2565 };
2566
2567 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2568
2569 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2570 {
2571         struct ifmcaddr6 *im = NULL;
2572         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2573         struct net *net = seq_file_net(seq);
2574
2575         state->idev = NULL;
2576         for_each_netdev_rcu(net, state->dev) {
2577                 struct inet6_dev *idev;
2578                 idev = __in6_dev_get(state->dev);
2579                 if (!idev)
2580                         continue;
2581                 read_lock_bh(&idev->lock);
2582                 im = idev->mc_list;
2583                 if (im) {
2584                         state->idev = idev;
2585                         break;
2586                 }
2587                 read_unlock_bh(&idev->lock);
2588         }
2589         return im;
2590 }
2591
2592 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2593 {
2594         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2595
2596         im = im->next;
2597         while (!im) {
2598                 if (likely(state->idev != NULL))
2599                         read_unlock_bh(&state->idev->lock);
2600
2601                 state->dev = next_net_device_rcu(state->dev);
2602                 if (!state->dev) {
2603                         state->idev = NULL;
2604                         break;
2605                 }
2606                 state->idev = __in6_dev_get(state->dev);
2607                 if (!state->idev)
2608                         continue;
2609                 read_lock_bh(&state->idev->lock);
2610                 im = state->idev->mc_list;
2611         }
2612         return im;
2613 }
2614
2615 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2616 {
2617         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2618         if (im)
2619                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2620                         --pos;
2621         return pos ? NULL : im;
2622 }
2623
2624 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2625         __acquires(RCU)
2626 {
2627         rcu_read_lock();
2628         return igmp6_mc_get_idx(seq, *pos);
2629 }
2630
2631 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2632 {
2633         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2634
2635         ++*pos;
2636         return im;
2637 }
2638
2639 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2640         __releases(RCU)
2641 {
2642         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2643
2644         if (likely(state->idev != NULL)) {
2645                 read_unlock_bh(&state->idev->lock);
2646                 state->idev = NULL;
2647         }
2648         state->dev = NULL;
2649         rcu_read_unlock();
2650 }
2651
2652 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2653 {
2654         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2655         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2656
2657         seq_printf(seq,
2658                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2659                    state->dev->ifindex, state->dev->name,
2660                    &im->mca_addr,
2661                    im->mca_users, im->mca_flags,
2662                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2663                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2664         return 0;
2665 }
2666
2667 static const struct seq_operations igmp6_mc_seq_ops = {
2668         .start  =       igmp6_mc_seq_start,
2669         .next   =       igmp6_mc_seq_next,
2670         .stop   =       igmp6_mc_seq_stop,
2671         .show   =       igmp6_mc_seq_show,
2672 };
2673
2674 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2675 {
2676         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2677                             sizeof(struct igmp6_mc_iter_state));
2678 }
2679
2680 static const struct file_operations igmp6_mc_seq_fops = {
2681         .owner          =       THIS_MODULE,
2682         .open           =       igmp6_mc_seq_open,
2683         .read           =       seq_read,
2684         .llseek         =       seq_lseek,
2685         .release        =       seq_release_net,
2686 };
2687
2688 struct igmp6_mcf_iter_state {
2689         struct seq_net_private p;
2690         struct net_device *dev;
2691         struct inet6_dev *idev;
2692         struct ifmcaddr6 *im;
2693 };
2694
2695 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2696
2697 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2698 {
2699         struct ip6_sf_list *psf = NULL;
2700         struct ifmcaddr6 *im = NULL;
2701         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2702         struct net *net = seq_file_net(seq);
2703
2704         state->idev = NULL;
2705         state->im = NULL;
2706         for_each_netdev_rcu(net, state->dev) {
2707                 struct inet6_dev *idev;
2708                 idev = __in6_dev_get(state->dev);
2709                 if (unlikely(idev == NULL))
2710                         continue;
2711                 read_lock_bh(&idev->lock);
2712                 im = idev->mc_list;
2713                 if (likely(im != NULL)) {
2714                         spin_lock_bh(&im->mca_lock);
2715                         psf = im->mca_sources;
2716                         if (likely(psf != NULL)) {
2717                                 state->im = im;
2718                                 state->idev = idev;
2719                                 break;
2720                         }
2721                         spin_unlock_bh(&im->mca_lock);
2722                 }
2723                 read_unlock_bh(&idev->lock);
2724         }
2725         return psf;
2726 }
2727
2728 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2729 {
2730         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2731
2732         psf = psf->sf_next;
2733         while (!psf) {
2734                 spin_unlock_bh(&state->im->mca_lock);
2735                 state->im = state->im->next;
2736                 while (!state->im) {
2737                         if (likely(state->idev != NULL))
2738                                 read_unlock_bh(&state->idev->lock);
2739
2740                         state->dev = next_net_device_rcu(state->dev);
2741                         if (!state->dev) {
2742                                 state->idev = NULL;
2743                                 goto out;
2744                         }
2745                         state->idev = __in6_dev_get(state->dev);
2746                         if (!state->idev)
2747                                 continue;
2748                         read_lock_bh(&state->idev->lock);
2749                         state->im = state->idev->mc_list;
2750                 }
2751                 if (!state->im)
2752                         break;
2753                 spin_lock_bh(&state->im->mca_lock);
2754                 psf = state->im->mca_sources;
2755         }
2756 out:
2757         return psf;
2758 }
2759
2760 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2761 {
2762         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2763         if (psf)
2764                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2765                         --pos;
2766         return pos ? NULL : psf;
2767 }
2768
2769 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2770         __acquires(RCU)
2771 {
2772         rcu_read_lock();
2773         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2774 }
2775
2776 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2777 {
2778         struct ip6_sf_list *psf;
2779         if (v == SEQ_START_TOKEN)
2780                 psf = igmp6_mcf_get_first(seq);
2781         else
2782                 psf = igmp6_mcf_get_next(seq, v);
2783         ++*pos;
2784         return psf;
2785 }
2786
2787 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2788         __releases(RCU)
2789 {
2790         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2791         if (likely(state->im != NULL)) {
2792                 spin_unlock_bh(&state->im->mca_lock);
2793                 state->im = NULL;
2794         }
2795         if (likely(state->idev != NULL)) {
2796                 read_unlock_bh(&state->idev->lock);
2797                 state->idev = NULL;
2798         }
2799         state->dev = NULL;
2800         rcu_read_unlock();
2801 }
2802
2803 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2804 {
2805         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2806         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2807
2808         if (v == SEQ_START_TOKEN) {
2809                 seq_printf(seq,
2810                            "%3s %6s "
2811                            "%32s %32s %6s %6s\n", "Idx",
2812                            "Device", "Multicast Address",
2813                            "Source Address", "INC", "EXC");
2814         } else {
2815                 seq_printf(seq,
2816                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2817                            state->dev->ifindex, state->dev->name,
2818                            &state->im->mca_addr,
2819                            &psf->sf_addr,
2820                            psf->sf_count[MCAST_INCLUDE],
2821                            psf->sf_count[MCAST_EXCLUDE]);
2822         }
2823         return 0;
2824 }
2825
2826 static const struct seq_operations igmp6_mcf_seq_ops = {
2827         .start  =       igmp6_mcf_seq_start,
2828         .next   =       igmp6_mcf_seq_next,
2829         .stop   =       igmp6_mcf_seq_stop,
2830         .show   =       igmp6_mcf_seq_show,
2831 };
2832
2833 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2834 {
2835         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2836                             sizeof(struct igmp6_mcf_iter_state));
2837 }
2838
2839 static const struct file_operations igmp6_mcf_seq_fops = {
2840         .owner          =       THIS_MODULE,
2841         .open           =       igmp6_mcf_seq_open,
2842         .read           =       seq_read,
2843         .llseek         =       seq_lseek,
2844         .release        =       seq_release_net,
2845 };
2846
2847 static int __net_init igmp6_proc_init(struct net *net)
2848 {
2849         int err;
2850
2851         err = -ENOMEM;
2852         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2853                 goto out;
2854         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2855                          &igmp6_mcf_seq_fops))
2856                 goto out_proc_net_igmp6;
2857
2858         err = 0;
2859 out:
2860         return err;
2861
2862 out_proc_net_igmp6:
2863         remove_proc_entry("igmp6", net->proc_net);
2864         goto out;
2865 }
2866
2867 static void __net_exit igmp6_proc_exit(struct net *net)
2868 {
2869         remove_proc_entry("mcfilter6", net->proc_net);
2870         remove_proc_entry("igmp6", net->proc_net);
2871 }
2872 #else
2873 static inline int igmp6_proc_init(struct net *net)
2874 {
2875         return 0;
2876 }
2877 static inline void igmp6_proc_exit(struct net *net)
2878 {
2879 }
2880 #endif
2881
2882 static int __net_init igmp6_net_init(struct net *net)
2883 {
2884         int err;
2885
2886         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2887                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2888         if (err < 0) {
2889                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2890                        err);
2891                 goto out;
2892         }
2893
2894         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2895
2896         err = igmp6_proc_init(net);
2897         if (err)
2898                 goto out_sock_create;
2899 out:
2900         return err;
2901
2902 out_sock_create:
2903         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2904         goto out;
2905 }
2906
2907 static void __net_exit igmp6_net_exit(struct net *net)
2908 {
2909         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2910         igmp6_proc_exit(net);
2911 }
2912
2913 static struct pernet_operations igmp6_net_ops = {
2914         .init = igmp6_net_init,
2915         .exit = igmp6_net_exit,
2916 };
2917
2918 int __init igmp6_init(void)
2919 {
2920         return register_pernet_subsys(&igmp6_net_ops);
2921 }
2922
2923 void igmp6_cleanup(void)
2924 {
2925         unregister_pernet_subsys(&igmp6_net_ops);
2926 }