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 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  68 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  69         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  70         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  71         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  72 };
  73
  74 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  75
  76 static void igmp6_join_group(struct ifmcaddr6 *ma);
  77 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  78 static void igmp6_timer_handler(unsigned long data);
  79
  80 static void mld_gq_timer_expire(unsigned long data);
  81 static void mld_ifc_timer_expire(unsigned long data);
  82 static void mld_ifc_event(struct inet6_dev *idev);
  83 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  84 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  85 static void mld_clear_delrec(struct inet6_dev *idev);
  86 static bool mld_in_v1_mode(const struct inet6_dev *idev);
  87 static int sf_setstate(struct ifmcaddr6 *pmc);
  88 static void sf_markstate(struct ifmcaddr6 *pmc);
  89 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
  90 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  91                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
  92                           int delta);
  93 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  94                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
  95                           int delta);
  96 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
  97                             struct inet6_dev *idev);
  98
  99 #define MLD_QRV_DEFAULT         2
 100 /* RFC3810, 9.2. Query Interval */
 101 #define MLD_QI_DEFAULT          (125 * HZ)
 102 /* RFC3810, 9.3. Query Response Interval */
 103 #define MLD_QRI_DEFAULT         (10 * HZ)
 104
 105 /* RFC3810, 8.1 Query Version Distinctions */
 106 #define MLD_V1_QUERY_LEN        24
 107 #define MLD_V2_QUERY_LEN_MIN    28
 108
 109 #define IPV6_MLD_MAX_MSF        64
 110
 111 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 112 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
 113
 114 /*
 115  *      socket join on multicast group
 116  */
 117
 118 #define for_each_pmc_rcu(np, pmc)                               \
 119         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 120              pmc != NULL;                                       \
 121              pmc = rcu_dereference(pmc->next))
 122
 123 static int unsolicited_report_interval(struct inet6_dev *idev)
 124 {
 125         int iv;
 126
 127         if (mld_in_v1_mode(idev))
 128                 iv = idev->cnf.mldv1_unsolicited_report_interval;
 129         else
 130                 iv = idev->cnf.mldv2_unsolicited_report_interval;
 131
 132         return iv > 0 ? iv : 1;
 133 }
 134
 135 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 136 {
 137         struct net_device *dev = NULL;
 138         struct ipv6_mc_socklist *mc_lst;
 139         struct ipv6_pinfo *np = inet6_sk(sk);
 140         struct net *net = sock_net(sk);
 141         int err;
 142
 143         if (!ipv6_addr_is_multicast(addr))
 144                 return -EINVAL;
 145
 146         rcu_read_lock();
 147         for_each_pmc_rcu(np, mc_lst) {
 148                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 149                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 150                         rcu_read_unlock();
 151                         return -EADDRINUSE;
 152                 }
 153         }
 154         rcu_read_unlock();
 155
 156         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 157
 158         if (mc_lst == NULL)
 159                 return -ENOMEM;
 160
 161         mc_lst->next = NULL;
 162         mc_lst->addr = *addr;
 163
 164         rtnl_lock();
 165         if (ifindex == 0) {
 166                 struct rt6_info *rt;
 167                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 168                 if (rt) {
 169                         dev = rt->dst.dev;
 170                         ip6_rt_put(rt);
 171                 }
 172         } else
 173                 dev = __dev_get_by_index(net, ifindex);
 174
 175         if (dev == NULL) {
 176                 rtnl_unlock();
 177                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 178                 return -ENODEV;
 179         }
 180
 181         mc_lst->ifindex = dev->ifindex;
 182         mc_lst->sfmode = MCAST_EXCLUDE;
 183         rwlock_init(&mc_lst->sflock);
 184         mc_lst->sflist = NULL;
 185
 186         /*
 187          *      now add/increase the group membership on the device
 188          */
 189
 190         err = ipv6_dev_mc_inc(dev, addr);
 191
 192         if (err) {
 193                 rtnl_unlock();
 194                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 195                 return err;
 196         }
 197
 198         mc_lst->next = np->ipv6_mc_list;
 199         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 200
 201         rtnl_unlock();
 202
 203         return 0;
 204 }
 205
 206 /*
 207  *      socket leave on multicast group
 208  */
 209 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 210 {
 211         struct ipv6_pinfo *np = inet6_sk(sk);
 212         struct ipv6_mc_socklist *mc_lst;
 213         struct ipv6_mc_socklist __rcu **lnk;
 214         struct net *net = sock_net(sk);
 215
 216         if (!ipv6_addr_is_multicast(addr))
 217                 return -EINVAL;
 218
 219         rtnl_lock();
 220         for (lnk = &np->ipv6_mc_list;
 221              (mc_lst = rtnl_dereference(*lnk)) != NULL;
 222               lnk = &mc_lst->next) {
 223                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 224                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 225                         struct net_device *dev;
 226
 227                         *lnk = mc_lst->next;
 228
 229                         dev = __dev_get_by_index(net, mc_lst->ifindex);
 230                         if (dev != NULL) {
 231                                 struct inet6_dev *idev = __in6_dev_get(dev);
 232
 233                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 234                                 if (idev)
 235                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 236                         } else
 237                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 238                         rtnl_unlock();
 239
 240                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 241                         kfree_rcu(mc_lst, rcu);
 242                         return 0;
 243                 }
 244         }
 245         rtnl_unlock();
 246
 247         return -EADDRNOTAVAIL;
 248 }
 249
 250 /* called with rcu_read_lock() */
 251 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 252                                              const struct in6_addr *group,
 253                                              int ifindex)
 254 {
 255         struct net_device *dev = NULL;
 256         struct inet6_dev *idev = NULL;
 257
 258         if (ifindex == 0) {
 259                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 260
 261                 if (rt) {
 262                         dev = rt->dst.dev;
 263                         ip6_rt_put(rt);
 264                 }
 265         } else
 266                 dev = dev_get_by_index_rcu(net, ifindex);
 267
 268         if (!dev)
 269                 return NULL;
 270         idev = __in6_dev_get(dev);
 271         if (!idev)
 272                 return NULL;
 273         read_lock_bh(&idev->lock);
 274         if (idev->dead) {
 275                 read_unlock_bh(&idev->lock);
 276                 return NULL;
 277         }
 278         return idev;
 279 }
 280
 281 void ipv6_sock_mc_close(struct sock *sk)
 282 {
 283         struct ipv6_pinfo *np = inet6_sk(sk);
 284         struct ipv6_mc_socklist *mc_lst;
 285         struct net *net = sock_net(sk);
 286
 287         if (!rcu_access_pointer(np->ipv6_mc_list))
 288                 return;
 289
 290         rtnl_lock();
 291         while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
 292                 struct net_device *dev;
 293
 294                 np->ipv6_mc_list = mc_lst->next;
 295
 296                 dev = __dev_get_by_index(net, mc_lst->ifindex);
 297                 if (dev) {
 298                         struct inet6_dev *idev = __in6_dev_get(dev);
 299
 300                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 301                         if (idev)
 302                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 303                 } else
 304                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 305
 306                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 307                 kfree_rcu(mc_lst, rcu);
 308
 309         }
 310         rtnl_unlock();
 311 }
 312
 313 int ip6_mc_source(int add, int omode, struct sock *sk,
 314         struct group_source_req *pgsr)
 315 {
 316         struct in6_addr *source, *group;
 317         struct ipv6_mc_socklist *pmc;
 318         struct inet6_dev *idev;
 319         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 320         struct ip6_sf_socklist *psl;
 321         struct net *net = sock_net(sk);
 322         int i, j, rv;
 323         int leavegroup = 0;
 324         int pmclocked = 0;
 325         int err;
 326
 327         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 328         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 329
 330         if (!ipv6_addr_is_multicast(group))
 331                 return -EINVAL;
 332
 333         rcu_read_lock();
 334         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 335         if (!idev) {
 336                 rcu_read_unlock();
 337                 return -ENODEV;
 338         }
 339
 340         err = -EADDRNOTAVAIL;
 341
 342         for_each_pmc_rcu(inet6, pmc) {
 343                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 344                         continue;
 345                 if (ipv6_addr_equal(&pmc->addr, group))
 346                         break;
 347         }
 348         if (!pmc) {             /* must have a prior join */
 349                 err = -EINVAL;
 350                 goto done;
 351         }
 352         /* if a source filter was set, must be the same mode as before */
 353         if (pmc->sflist) {
 354                 if (pmc->sfmode != omode) {
 355                         err = -EINVAL;
 356                         goto done;
 357                 }
 358         } else if (pmc->sfmode != omode) {
 359                 /* allow mode switches for empty-set filters */
 360                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 361                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 362                 pmc->sfmode = omode;
 363         }
 364
 365         write_lock(&pmc->sflock);
 366         pmclocked = 1;
 367
 368         psl = pmc->sflist;
 369         if (!add) {
 370                 if (!psl)
 371                         goto done;      /* err = -EADDRNOTAVAIL */
 372                 rv = !0;
 373                 for (i = 0; i < psl->sl_count; i++) {
 374                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 375                         if (rv == 0)
 376                                 break;
 377                 }
 378                 if (rv)         /* source not found */
 379                         goto done;      /* err = -EADDRNOTAVAIL */
 380
 381                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 382                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 383                         leavegroup = 1;
 384                         goto done;
 385                 }
 386
 387                 /* update the interface filter */
 388                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 389
 390                 for (j = i+1; j < psl->sl_count; j++)
 391                         psl->sl_addr[j-1] = psl->sl_addr[j];
 392                 psl->sl_count--;
 393                 err = 0;
 394                 goto done;
 395         }
 396         /* else, add a new source to the filter */
 397
 398         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 399                 err = -ENOBUFS;
 400                 goto done;
 401         }
 402         if (!psl || psl->sl_count == psl->sl_max) {
 403                 struct ip6_sf_socklist *newpsl;
 404                 int count = IP6_SFBLOCK;
 405
 406                 if (psl)
 407                         count += psl->sl_max;
 408                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 409                 if (!newpsl) {
 410                         err = -ENOBUFS;
 411                         goto done;
 412                 }
 413                 newpsl->sl_max = count;
 414                 newpsl->sl_count = count - IP6_SFBLOCK;
 415                 if (psl) {
 416                         for (i = 0; i < psl->sl_count; i++)
 417                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 418                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 419                 }
 420                 pmc->sflist = psl = newpsl;
 421         }
 422         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 423         for (i = 0; i < psl->sl_count; i++) {
 424                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 425                 if (rv == 0) /* There is an error in the address. */
 426                         goto done;
 427         }
 428         for (j = psl->sl_count-1; j >= i; j--)
 429                 psl->sl_addr[j+1] = psl->sl_addr[j];
 430         psl->sl_addr[i] = *source;
 431         psl->sl_count++;
 432         err = 0;
 433         /* update the interface list */
 434         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 435 done:
 436         if (pmclocked)
 437                 write_unlock(&pmc->sflock);
 438         read_unlock_bh(&idev->lock);
 439         rcu_read_unlock();
 440         if (leavegroup)
 441                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 442         return err;
 443 }
 444
 445 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 446 {
 447         const struct in6_addr *group;
 448         struct ipv6_mc_socklist *pmc;
 449         struct inet6_dev *idev;
 450         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 451         struct ip6_sf_socklist *newpsl, *psl;
 452         struct net *net = sock_net(sk);
 453         int leavegroup = 0;
 454         int i, err;
 455
 456         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 457
 458         if (!ipv6_addr_is_multicast(group))
 459                 return -EINVAL;
 460         if (gsf->gf_fmode != MCAST_INCLUDE &&
 461             gsf->gf_fmode != MCAST_EXCLUDE)
 462                 return -EINVAL;
 463
 464         rcu_read_lock();
 465         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 466
 467         if (!idev) {
 468                 rcu_read_unlock();
 469                 return -ENODEV;
 470         }
 471
 472         err = 0;
 473
 474         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 475                 leavegroup = 1;
 476                 goto done;
 477         }
 478
 479         for_each_pmc_rcu(inet6, pmc) {
 480                 if (pmc->ifindex != gsf->gf_interface)
 481                         continue;
 482                 if (ipv6_addr_equal(&pmc->addr, group))
 483                         break;
 484         }
 485         if (!pmc) {             /* must have a prior join */
 486                 err = -EINVAL;
 487                 goto done;
 488         }
 489         if (gsf->gf_numsrc) {
 490                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 491                                                           GFP_ATOMIC);
 492                 if (!newpsl) {
 493                         err = -ENOBUFS;
 494                         goto done;
 495                 }
 496                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 497                 for (i = 0; i < newpsl->sl_count; ++i) {
 498                         struct sockaddr_in6 *psin6;
 499
 500                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 501                         newpsl->sl_addr[i] = psin6->sin6_addr;
 502                 }
 503                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 504                         newpsl->sl_count, newpsl->sl_addr, 0);
 505                 if (err) {
 506                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 507                         goto done;
 508                 }
 509         } else {
 510                 newpsl = NULL;
 511                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 512         }
 513
 514         write_lock(&pmc->sflock);
 515         psl = pmc->sflist;
 516         if (psl) {
 517                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 518                         psl->sl_count, psl->sl_addr, 0);
 519                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 520         } else
 521                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 522         pmc->sflist = newpsl;
 523         pmc->sfmode = gsf->gf_fmode;
 524         write_unlock(&pmc->sflock);
 525         err = 0;
 526 done:
 527         read_unlock_bh(&idev->lock);
 528         rcu_read_unlock();
 529         if (leavegroup)
 530                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 531         return err;
 532 }
 533
 534 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 535         struct group_filter __user *optval, int __user *optlen)
 536 {
 537         int err, i, count, copycount;
 538         const struct in6_addr *group;
 539         struct ipv6_mc_socklist *pmc;
 540         struct inet6_dev *idev;
 541         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 542         struct ip6_sf_socklist *psl;
 543         struct net *net = sock_net(sk);
 544
 545         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 546
 547         if (!ipv6_addr_is_multicast(group))
 548                 return -EINVAL;
 549
 550         rcu_read_lock();
 551         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 552
 553         if (!idev) {
 554                 rcu_read_unlock();
 555                 return -ENODEV;
 556         }
 557
 558         err = -EADDRNOTAVAIL;
 559         /* changes to the ipv6_mc_list require the socket lock and
 560          * rtnl lock. We have the socket lock and rcu read lock,
 561          * so reading the list is safe.
 562          */
 563
 564         for_each_pmc_rcu(inet6, pmc) {
 565                 if (pmc->ifindex != gsf->gf_interface)
 566                         continue;
 567                 if (ipv6_addr_equal(group, &pmc->addr))
 568                         break;
 569         }
 570         if (!pmc)               /* must have a prior join */
 571                 goto done;
 572         gsf->gf_fmode = pmc->sfmode;
 573         psl = pmc->sflist;
 574         count = psl ? psl->sl_count : 0;
 575         read_unlock_bh(&idev->lock);
 576         rcu_read_unlock();
 577
 578         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 579         gsf->gf_numsrc = count;
 580         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 581             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 582                 return -EFAULT;
 583         }
 584         /* changes to psl require the socket lock, and a write lock
 585          * on pmc->sflock. We have the socket lock so reading here is safe.
 586          */
 587         for (i = 0; i < copycount; i++) {
 588                 struct sockaddr_in6 *psin6;
 589                 struct sockaddr_storage ss;
 590
 591                 psin6 = (struct sockaddr_in6 *)&ss;
 592                 memset(&ss, 0, sizeof(ss));
 593                 psin6->sin6_family = AF_INET6;
 594                 psin6->sin6_addr = psl->sl_addr[i];
 595                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 596                         return -EFAULT;
 597         }
 598         return 0;
 599 done:
 600         read_unlock_bh(&idev->lock);
 601         rcu_read_unlock();
 602         return err;
 603 }
 604
 605 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 606                     const struct in6_addr *src_addr)
 607 {
 608         struct ipv6_pinfo *np = inet6_sk(sk);
 609         struct ipv6_mc_socklist *mc;
 610         struct ip6_sf_socklist *psl;
 611         bool rv = true;
 612
 613         rcu_read_lock();
 614         for_each_pmc_rcu(np, mc) {
 615                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 616                         break;
 617         }
 618         if (!mc) {
 619                 rcu_read_unlock();
 620                 return true;
 621         }
 622         read_lock(&mc->sflock);
 623         psl = mc->sflist;
 624         if (!psl) {
 625                 rv = mc->sfmode == MCAST_EXCLUDE;
 626         } else {
 627                 int i;
 628
 629                 for (i = 0; i < psl->sl_count; i++) {
 630                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 631                                 break;
 632                 }
 633                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 634                         rv = false;
 635                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 636                         rv = false;
 637         }
 638         read_unlock(&mc->sflock);
 639         rcu_read_unlock();
 640
 641         return rv;
 642 }
 643
 644 static void igmp6_group_added(struct ifmcaddr6 *mc)
 645 {
 646         struct net_device *dev = mc->idev->dev;
 647         char buf[MAX_ADDR_LEN];
 648
 649         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 650             IPV6_ADDR_SCOPE_LINKLOCAL)
 651                 return;
 652
 653         spin_lock_bh(&mc->mca_lock);
 654         if (!(mc->mca_flags&MAF_LOADED)) {
 655                 mc->mca_flags |= MAF_LOADED;
 656                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 657                         dev_mc_add(dev, buf);
 658         }
 659         spin_unlock_bh(&mc->mca_lock);
 660
 661         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 662                 return;
 663
 664         if (mld_in_v1_mode(mc->idev)) {
 665                 igmp6_join_group(mc);
 666                 return;
 667         }
 668         /* else v2 */
 669
 670         mc->mca_crcount = mc->idev->mc_qrv;
 671         mld_ifc_event(mc->idev);
 672 }
 673
 674 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 675 {
 676         struct net_device *dev = mc->idev->dev;
 677         char buf[MAX_ADDR_LEN];
 678
 679         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 680             IPV6_ADDR_SCOPE_LINKLOCAL)
 681                 return;
 682
 683         spin_lock_bh(&mc->mca_lock);
 684         if (mc->mca_flags&MAF_LOADED) {
 685                 mc->mca_flags &= ~MAF_LOADED;
 686                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 687                         dev_mc_del(dev, buf);
 688         }
 689
 690         if (mc->mca_flags & MAF_NOREPORT)
 691                 goto done;
 692         spin_unlock_bh(&mc->mca_lock);
 693
 694         if (!mc->idev->dead)
 695                 igmp6_leave_group(mc);
 696
 697         spin_lock_bh(&mc->mca_lock);
 698         if (del_timer(&mc->mca_timer))
 699                 atomic_dec(&mc->mca_refcnt);
 700 done:
 701         ip6_mc_clear_src(mc);
 702         spin_unlock_bh(&mc->mca_lock);
 703 }
 704
 705 /*
 706  * deleted ifmcaddr6 manipulation
 707  */
 708 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 709 {
 710         struct ifmcaddr6 *pmc;
 711
 712         /* this is an "ifmcaddr6" for convenience; only the fields below
 713          * are actually used. In particular, the refcnt and users are not
 714          * used for management of the delete list. Using the same structure
 715          * for deleted items allows change reports to use common code with
 716          * non-deleted or query-response MCA's.
 717          */
 718         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 719         if (!pmc)
 720                 return;
 721
 722         spin_lock_bh(&im->mca_lock);
 723         spin_lock_init(&pmc->mca_lock);
 724         pmc->idev = im->idev;
 725         in6_dev_hold(idev);
 726         pmc->mca_addr = im->mca_addr;
 727         pmc->mca_crcount = idev->mc_qrv;
 728         pmc->mca_sfmode = im->mca_sfmode;
 729         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 730                 struct ip6_sf_list *psf;
 731
 732                 pmc->mca_tomb = im->mca_tomb;
 733                 pmc->mca_sources = im->mca_sources;
 734                 im->mca_tomb = im->mca_sources = NULL;
 735                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
 736                         psf->sf_crcount = pmc->mca_crcount;
 737         }
 738         spin_unlock_bh(&im->mca_lock);
 739
 740         spin_lock_bh(&idev->mc_lock);
 741         pmc->next = idev->mc_tomb;
 742         idev->mc_tomb = pmc;
 743         spin_unlock_bh(&idev->mc_lock);
 744 }
 745
 746 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 747 {
 748         struct ifmcaddr6 *pmc, *pmc_prev;
 749         struct ip6_sf_list *psf, *psf_next;
 750
 751         spin_lock_bh(&idev->mc_lock);
 752         pmc_prev = NULL;
 753         for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
 754                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 755                         break;
 756                 pmc_prev = pmc;
 757         }
 758         if (pmc) {
 759                 if (pmc_prev)
 760                         pmc_prev->next = pmc->next;
 761                 else
 762                         idev->mc_tomb = pmc->next;
 763         }
 764         spin_unlock_bh(&idev->mc_lock);
 765
 766         if (pmc) {
 767                 for (psf = pmc->mca_tomb; psf; psf = psf_next) {
 768                         psf_next = psf->sf_next;
 769                         kfree(psf);
 770                 }
 771                 in6_dev_put(pmc->idev);
 772                 kfree(pmc);
 773         }
 774 }
 775
 776 static void mld_clear_delrec(struct inet6_dev *idev)
 777 {
 778         struct ifmcaddr6 *pmc, *nextpmc;
 779
 780         spin_lock_bh(&idev->mc_lock);
 781         pmc = idev->mc_tomb;
 782         idev->mc_tomb = NULL;
 783         spin_unlock_bh(&idev->mc_lock);
 784
 785         for (; pmc; pmc = nextpmc) {
 786                 nextpmc = pmc->next;
 787                 ip6_mc_clear_src(pmc);
 788                 in6_dev_put(pmc->idev);
 789                 kfree(pmc);
 790         }
 791
 792         /* clear dead sources, too */
 793         read_lock_bh(&idev->lock);
 794         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
 795                 struct ip6_sf_list *psf, *psf_next;
 796
 797                 spin_lock_bh(&pmc->mca_lock);
 798                 psf = pmc->mca_tomb;
 799                 pmc->mca_tomb = NULL;
 800                 spin_unlock_bh(&pmc->mca_lock);
 801                 for (; psf; psf = psf_next) {
 802                         psf_next = psf->sf_next;
 803                         kfree(psf);
 804                 }
 805         }
 806         read_unlock_bh(&idev->lock);
 807 }
 808
 809 static void mca_get(struct ifmcaddr6 *mc)
 810 {
 811         atomic_inc(&mc->mca_refcnt);
 812 }
 813
 814 static void ma_put(struct ifmcaddr6 *mc)
 815 {
 816         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 817                 in6_dev_put(mc->idev);
 818                 kfree(mc);
 819         }
 820 }
 821
 822 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
 823                                    const struct in6_addr *addr)
 824 {
 825         struct ifmcaddr6 *mc;
 826
 827         mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
 828         if (mc == NULL)
 829                 return NULL;
 830
 831         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 832
 833         mc->mca_addr = *addr;
 834         mc->idev = idev; /* reference taken by caller */
 835         mc->mca_users = 1;
 836         /* mca_stamp should be updated upon changes */
 837         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 838         atomic_set(&mc->mca_refcnt, 1);
 839         spin_lock_init(&mc->mca_lock);
 840
 841         /* initial mode is (EX, empty) */
 842         mc->mca_sfmode = MCAST_EXCLUDE;
 843         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 844
 845         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 846             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 847                 mc->mca_flags |= MAF_NOREPORT;
 848
 849         return mc;
 850 }
 851
 852 /*
 853  *      device multicast group inc (add if not found)
 854  */
 855 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 856 {
 857         struct ifmcaddr6 *mc;
 858         struct inet6_dev *idev;
 859
 860         ASSERT_RTNL();
 861
 862         /* we need to take a reference on idev */
 863         idev = in6_dev_get(dev);
 864
 865         if (idev == NULL)
 866                 return -EINVAL;
 867
 868         write_lock_bh(&idev->lock);
 869         if (idev->dead) {
 870                 write_unlock_bh(&idev->lock);
 871                 in6_dev_put(idev);
 872                 return -ENODEV;
 873         }
 874
 875         for (mc = idev->mc_list; mc; mc = mc->next) {
 876                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 877                         mc->mca_users++;
 878                         write_unlock_bh(&idev->lock);
 879                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 880                                 NULL, 0);
 881                         in6_dev_put(idev);
 882                         return 0;
 883                 }
 884         }
 885
 886         mc = mca_alloc(idev, addr);
 887         if (!mc) {
 888                 write_unlock_bh(&idev->lock);
 889                 in6_dev_put(idev);
 890                 return -ENOMEM;
 891         }
 892
 893         mc->next = idev->mc_list;
 894         idev->mc_list = mc;
 895
 896         /* Hold this for the code below before we unlock,
 897          * it is already exposed via idev->mc_list.
 898          */
 899         mca_get(mc);
 900         write_unlock_bh(&idev->lock);
 901
 902         mld_del_delrec(idev, &mc->mca_addr);
 903         igmp6_group_added(mc);
 904         ma_put(mc);
 905         return 0;
 906 }
 907
 908 /*
 909  *      device multicast group del
 910  */
 911 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 912 {
 913         struct ifmcaddr6 *ma, **map;
 914
 915         ASSERT_RTNL();
 916
 917         write_lock_bh(&idev->lock);
 918         for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
 919                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 920                         if (--ma->mca_users == 0) {
 921                                 *map = ma->next;
 922                                 write_unlock_bh(&idev->lock);
 923
 924                                 igmp6_group_dropped(ma);
 925
 926                                 ma_put(ma);
 927                                 return 0;
 928                         }
 929                         write_unlock_bh(&idev->lock);
 930                         return 0;
 931                 }
 932         }
 933         write_unlock_bh(&idev->lock);
 934
 935         return -ENOENT;
 936 }
 937
 938 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 939 {
 940         struct inet6_dev *idev;
 941         int err;
 942
 943         ASSERT_RTNL();
 944
 945         idev = __in6_dev_get(dev);
 946         if (!idev)
 947                 err = -ENODEV;
 948         else
 949                 err = __ipv6_dev_mc_dec(idev, addr);
 950
 951         return err;
 952 }
 953
 954 /*
 955  *      check if the interface/address pair is valid
 956  */
 957 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 958                          const struct in6_addr *src_addr)
 959 {
 960         struct inet6_dev *idev;
 961         struct ifmcaddr6 *mc;
 962         bool rv = false;
 963
 964         rcu_read_lock();
 965         idev = __in6_dev_get(dev);
 966         if (idev) {
 967                 read_lock_bh(&idev->lock);
 968                 for (mc = idev->mc_list; mc; mc = mc->next) {
 969                         if (ipv6_addr_equal(&mc->mca_addr, group))
 970                                 break;
 971                 }
 972                 if (mc) {
 973                         if (src_addr && !ipv6_addr_any(src_addr)) {
 974                                 struct ip6_sf_list *psf;
 975
 976                                 spin_lock_bh(&mc->mca_lock);
 977                                 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
 978                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 979                                                 break;
 980                                 }
 981                                 if (psf)
 982                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 983                                                 psf->sf_count[MCAST_EXCLUDE] !=
 984                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 985                                 else
 986                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
 987                                 spin_unlock_bh(&mc->mca_lock);
 988                         } else
 989                                 rv = true; /* don't filter unspecified source */
 990                 }
 991                 read_unlock_bh(&idev->lock);
 992         }
 993         rcu_read_unlock();
 994         return rv;
 995 }
 996
 997 static void mld_gq_start_timer(struct inet6_dev *idev)
 998 {
 999         unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1000
1001         idev->mc_gq_running = 1;
1002         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1003                 in6_dev_hold(idev);
1004 }
1005
1006 static void mld_gq_stop_timer(struct inet6_dev *idev)
1007 {
1008         idev->mc_gq_running = 0;
1009         if (del_timer(&idev->mc_gq_timer))
1010                 __in6_dev_put(idev);
1011 }
1012
1013 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1014 {
1015         unsigned long tv = prandom_u32() % delay;
1016
1017         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1018                 in6_dev_hold(idev);
1019 }
1020
1021 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1022 {
1023         idev->mc_ifc_count = 0;
1024         if (del_timer(&idev->mc_ifc_timer))
1025                 __in6_dev_put(idev);
1026 }
1027
1028 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1029 {
1030         unsigned long tv = prandom_u32() % delay;
1031
1032         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1033                 in6_dev_hold(idev);
1034 }
1035
1036 static void mld_dad_stop_timer(struct inet6_dev *idev)
1037 {
1038         if (del_timer(&idev->mc_dad_timer))
1039                 __in6_dev_put(idev);
1040 }
1041
1042 /*
1043  *      IGMP handling (alias multicast ICMPv6 messages)
1044  */
1045
1046 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1047 {
1048         unsigned long delay = resptime;
1049
1050         /* Do not start timer for these addresses */
1051         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1052             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1053                 return;
1054
1055         if (del_timer(&ma->mca_timer)) {
1056                 atomic_dec(&ma->mca_refcnt);
1057                 delay = ma->mca_timer.expires - jiffies;
1058         }
1059
1060         if (delay >= resptime)
1061                 delay = prandom_u32() % resptime;
1062
1063         ma->mca_timer.expires = jiffies + delay;
1064         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1065                 atomic_inc(&ma->mca_refcnt);
1066         ma->mca_flags |= MAF_TIMER_RUNNING;
1067 }
1068
1069 /* mark EXCLUDE-mode sources */
1070 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1071                              const struct in6_addr *srcs)
1072 {
1073         struct ip6_sf_list *psf;
1074         int i, scount;
1075
1076         scount = 0;
1077         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1078                 if (scount == nsrcs)
1079                         break;
1080                 for (i = 0; i < nsrcs; i++) {
1081                         /* skip inactive filters */
1082                         if (psf->sf_count[MCAST_INCLUDE] ||
1083                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1084                             psf->sf_count[MCAST_EXCLUDE])
1085                                 break;
1086                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1087                                 scount++;
1088                                 break;
1089                         }
1090                 }
1091         }
1092         pmc->mca_flags &= ~MAF_GSQUERY;
1093         if (scount == nsrcs)    /* all sources excluded */
1094                 return false;
1095         return true;
1096 }
1097
1098 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1099                             const struct in6_addr *srcs)
1100 {
1101         struct ip6_sf_list *psf;
1102         int i, scount;
1103
1104         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1105                 return mld_xmarksources(pmc, nsrcs, srcs);
1106
1107         /* mark INCLUDE-mode sources */
1108
1109         scount = 0;
1110         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1111                 if (scount == nsrcs)
1112                         break;
1113                 for (i = 0; i < nsrcs; i++) {
1114                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1115                                 psf->sf_gsresp = 1;
1116                                 scount++;
1117                                 break;
1118                         }
1119                 }
1120         }
1121         if (!scount) {
1122                 pmc->mca_flags &= ~MAF_GSQUERY;
1123                 return false;
1124         }
1125         pmc->mca_flags |= MAF_GSQUERY;
1126         return true;
1127 }
1128
1129 static int mld_force_mld_version(const struct inet6_dev *idev)
1130 {
1131         /* Normally, both are 0 here. If enforcement to a particular is
1132          * being used, individual device enforcement will have a lower
1133          * precedence over 'all' device (.../conf/all/force_mld_version).
1134          */
1135
1136         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1137                 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1138         else
1139                 return idev->cnf.force_mld_version;
1140 }
1141
1142 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1143 {
1144         return mld_force_mld_version(idev) == 2;
1145 }
1146
1147 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1148 {
1149         return mld_force_mld_version(idev) == 1;
1150 }
1151
1152 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1153 {
1154         if (mld_in_v2_mode_only(idev))
1155                 return false;
1156         if (mld_in_v1_mode_only(idev))
1157                 return true;
1158         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1159                 return true;
1160
1161         return false;
1162 }
1163
1164 static void mld_set_v1_mode(struct inet6_dev *idev)
1165 {
1166         /* RFC3810, relevant sections:
1167          *  - 9.1. Robustness Variable
1168          *  - 9.2. Query Interval
1169          *  - 9.3. Query Response Interval
1170          *  - 9.12. Older Version Querier Present Timeout
1171          */
1172         unsigned long switchback;
1173
1174         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1175
1176         idev->mc_v1_seen = jiffies + switchback;
1177 }
1178
1179 static void mld_update_qrv(struct inet6_dev *idev,
1180                            const struct mld2_query *mlh2)
1181 {
1182         /* RFC3810, relevant sections:
1183          *  - 5.1.8. QRV (Querier's Robustness Variable)
1184          *  - 9.1. Robustness Variable
1185          */
1186
1187         /* The value of the Robustness Variable MUST NOT be zero,
1188          * and SHOULD NOT be one. Catch this here if we ever run
1189          * into such a case in future.
1190          */
1191         const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1192         WARN_ON(idev->mc_qrv == 0);
1193
1194         if (mlh2->mld2q_qrv > 0)
1195                 idev->mc_qrv = mlh2->mld2q_qrv;
1196
1197         if (unlikely(idev->mc_qrv < min_qrv)) {
1198                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1199                                      idev->mc_qrv, min_qrv);
1200                 idev->mc_qrv = min_qrv;
1201         }
1202 }
1203
1204 static void mld_update_qi(struct inet6_dev *idev,
1205                           const struct mld2_query *mlh2)
1206 {
1207         /* RFC3810, relevant sections:
1208          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1209          *  - 9.2. Query Interval
1210          *  - 9.12. Older Version Querier Present Timeout
1211          *    (the [Query Interval] in the last Query received)
1212          */
1213         unsigned long mc_qqi;
1214
1215         if (mlh2->mld2q_qqic < 128) {
1216                 mc_qqi = mlh2->mld2q_qqic;
1217         } else {
1218                 unsigned long mc_man, mc_exp;
1219
1220                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1221                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1222
1223                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1224         }
1225
1226         idev->mc_qi = mc_qqi * HZ;
1227 }
1228
1229 static void mld_update_qri(struct inet6_dev *idev,
1230                            const struct mld2_query *mlh2)
1231 {
1232         /* RFC3810, relevant sections:
1233          *  - 5.1.3. Maximum Response Code
1234          *  - 9.3. Query Response Interval
1235          */
1236         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1237 }
1238
1239 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1240                           unsigned long *max_delay, bool v1_query)
1241 {
1242         unsigned long mldv1_md;
1243
1244         /* Ignore v1 queries */
1245         if (mld_in_v2_mode_only(idev))
1246                 return -EINVAL;
1247
1248         mldv1_md = ntohs(mld->mld_maxdelay);
1249
1250         /* When in MLDv1 fallback and a MLDv2 router start-up being
1251          * unaware of current MLDv1 operation, the MRC == MRD mapping
1252          * only works when the exponential algorithm is not being
1253          * used (as MLDv1 is unaware of such things).
1254          *
1255          * According to the RFC author, the MLDv2 implementations
1256          * he's aware of all use a MRC < 32768 on start up queries.
1257          *
1258          * Thus, should we *ever* encounter something else larger
1259          * than that, just assume the maximum possible within our
1260          * reach.
1261          */
1262         if (!v1_query)
1263                 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1264
1265         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1266
1267         /* MLDv1 router present: we need to go into v1 mode *only*
1268          * when an MLDv1 query is received as per section 9.12. of
1269          * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1270          * queries MUST be of exactly 24 octets.
1271          */
1272         if (v1_query)
1273                 mld_set_v1_mode(idev);
1274
1275         /* cancel MLDv2 report timer */
1276         mld_gq_stop_timer(idev);
1277         /* cancel the interface change timer */
1278         mld_ifc_stop_timer(idev);
1279         /* clear deleted report items */
1280         mld_clear_delrec(idev);
1281
1282         return 0;
1283 }
1284
1285 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1286                           unsigned long *max_delay)
1287 {
1288         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1289
1290         mld_update_qrv(idev, mld);
1291         mld_update_qi(idev, mld);
1292         mld_update_qri(idev, mld);
1293
1294         idev->mc_maxdelay = *max_delay;
1295
1296         return 0;
1297 }
1298
1299 /* called with rcu_read_lock() */
1300 int igmp6_event_query(struct sk_buff *skb)
1301 {
1302         struct mld2_query *mlh2 = NULL;
1303         struct ifmcaddr6 *ma;
1304         const struct in6_addr *group;
1305         unsigned long max_delay;
1306         struct inet6_dev *idev;
1307         struct mld_msg *mld;
1308         int group_type;
1309         int mark = 0;
1310         int len, err;
1311
1312         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1313                 return -EINVAL;
1314
1315         /* compute payload length excluding extension headers */
1316         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1317         len -= skb_network_header_len(skb);
1318
1319         /* RFC3810 6.2
1320          * Upon reception of an MLD message that contains a Query, the node
1321          * checks if the source address of the message is a valid link-local
1322          * address, if the Hop Limit is set to 1, and if the Router Alert
1323          * option is present in the Hop-By-Hop Options header of the IPv6
1324          * packet.  If any of these checks fails, the packet is dropped.
1325          */
1326         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1327             ipv6_hdr(skb)->hop_limit != 1 ||
1328             !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1329             IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1330                 return -EINVAL;
1331
1332         idev = __in6_dev_get(skb->dev);
1333         if (idev == NULL)
1334                 return 0;
1335
1336         mld = (struct mld_msg *)icmp6_hdr(skb);
1337         group = &mld->mld_mca;
1338         group_type = ipv6_addr_type(group);
1339
1340         if (group_type != IPV6_ADDR_ANY &&
1341             !(group_type&IPV6_ADDR_MULTICAST))
1342                 return -EINVAL;
1343
1344         if (len < MLD_V1_QUERY_LEN) {
1345                 return -EINVAL;
1346         } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1347                 err = mld_process_v1(idev, mld, &max_delay,
1348                                      len == MLD_V1_QUERY_LEN);
1349                 if (err < 0)
1350                         return err;
1351         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1352                 int srcs_offset = sizeof(struct mld2_query) -
1353                                   sizeof(struct icmp6hdr);
1354
1355                 if (!pskb_may_pull(skb, srcs_offset))
1356                         return -EINVAL;
1357
1358                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1359
1360                 err = mld_process_v2(idev, mlh2, &max_delay);
1361                 if (err < 0)
1362                         return err;
1363
1364                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1365                         if (mlh2->mld2q_nsrcs)
1366                                 return -EINVAL; /* no sources allowed */
1367
1368                         mld_gq_start_timer(idev);
1369                         return 0;
1370                 }
1371                 /* mark sources to include, if group & source-specific */
1372                 if (mlh2->mld2q_nsrcs != 0) {
1373                         if (!pskb_may_pull(skb, srcs_offset +
1374                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1375                                 return -EINVAL;
1376
1377                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1378                         mark = 1;
1379                 }
1380         } else {
1381                 return -EINVAL;
1382         }
1383
1384         read_lock_bh(&idev->lock);
1385         if (group_type == IPV6_ADDR_ANY) {
1386                 for (ma = idev->mc_list; ma; ma = ma->next) {
1387                         spin_lock_bh(&ma->mca_lock);
1388                         igmp6_group_queried(ma, max_delay);
1389                         spin_unlock_bh(&ma->mca_lock);
1390                 }
1391         } else {
1392                 for (ma = idev->mc_list; ma; ma = ma->next) {
1393                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1394                                 continue;
1395                         spin_lock_bh(&ma->mca_lock);
1396                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1397                                 /* gsquery <- gsquery && mark */
1398                                 if (!mark)
1399                                         ma->mca_flags &= ~MAF_GSQUERY;
1400                         } else {
1401                                 /* gsquery <- mark */
1402                                 if (mark)
1403                                         ma->mca_flags |= MAF_GSQUERY;
1404                                 else
1405                                         ma->mca_flags &= ~MAF_GSQUERY;
1406                         }
1407                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1408                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1409                                 igmp6_group_queried(ma, max_delay);
1410                         spin_unlock_bh(&ma->mca_lock);
1411                         break;
1412                 }
1413         }
1414         read_unlock_bh(&idev->lock);
1415
1416         return 0;
1417 }
1418
1419 /* called with rcu_read_lock() */
1420 int igmp6_event_report(struct sk_buff *skb)
1421 {
1422         struct ifmcaddr6 *ma;
1423         struct inet6_dev *idev;
1424         struct mld_msg *mld;
1425         int addr_type;
1426
1427         /* Our own report looped back. Ignore it. */
1428         if (skb->pkt_type == PACKET_LOOPBACK)
1429                 return 0;
1430
1431         /* send our report if the MC router may not have heard this report */
1432         if (skb->pkt_type != PACKET_MULTICAST &&
1433             skb->pkt_type != PACKET_BROADCAST)
1434                 return 0;
1435
1436         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1437                 return -EINVAL;
1438
1439         mld = (struct mld_msg *)icmp6_hdr(skb);
1440
1441         /* Drop reports with not link local source */
1442         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1443         if (addr_type != IPV6_ADDR_ANY &&
1444             !(addr_type&IPV6_ADDR_LINKLOCAL))
1445                 return -EINVAL;
1446
1447         idev = __in6_dev_get(skb->dev);
1448         if (idev == NULL)
1449                 return -ENODEV;
1450
1451         /*
1452          *      Cancel the timer for this group
1453          */
1454
1455         read_lock_bh(&idev->lock);
1456         for (ma = idev->mc_list; ma; ma = ma->next) {
1457                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1458                         spin_lock(&ma->mca_lock);
1459                         if (del_timer(&ma->mca_timer))
1460                                 atomic_dec(&ma->mca_refcnt);
1461                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1462                         spin_unlock(&ma->mca_lock);
1463                         break;
1464                 }
1465         }
1466         read_unlock_bh(&idev->lock);
1467         return 0;
1468 }
1469
1470 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1471                   int gdeleted, int sdeleted)
1472 {
1473         switch (type) {
1474         case MLD2_MODE_IS_INCLUDE:
1475         case MLD2_MODE_IS_EXCLUDE:
1476                 if (gdeleted || sdeleted)
1477                         return false;
1478                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1479                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1480                                 return true;
1481                         /* don't include if this source is excluded
1482                          * in all filters
1483                          */
1484                         if (psf->sf_count[MCAST_INCLUDE])
1485                                 return type == MLD2_MODE_IS_INCLUDE;
1486                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1487                                 psf->sf_count[MCAST_EXCLUDE];
1488                 }
1489                 return false;
1490         case MLD2_CHANGE_TO_INCLUDE:
1491                 if (gdeleted || sdeleted)
1492                         return false;
1493                 return psf->sf_count[MCAST_INCLUDE] != 0;
1494         case MLD2_CHANGE_TO_EXCLUDE:
1495                 if (gdeleted || sdeleted)
1496                         return false;
1497                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1498                     psf->sf_count[MCAST_INCLUDE])
1499                         return false;
1500                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1501                         psf->sf_count[MCAST_EXCLUDE];
1502         case MLD2_ALLOW_NEW_SOURCES:
1503                 if (gdeleted || !psf->sf_crcount)
1504                         return false;
1505                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1506         case MLD2_BLOCK_OLD_SOURCES:
1507                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1508                         return gdeleted || (psf->sf_crcount && sdeleted);
1509                 return psf->sf_crcount && !gdeleted && !sdeleted;
1510         }
1511         return false;
1512 }
1513
1514 static int
1515 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1516 {
1517         struct ip6_sf_list *psf;
1518         int scount = 0;
1519
1520         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1521                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1522                         continue;
1523                 scount++;
1524         }
1525         return scount;
1526 }
1527
1528 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1529                        struct net_device *dev,
1530                        const struct in6_addr *saddr,
1531                        const struct in6_addr *daddr,
1532                        int proto, int len)
1533 {
1534         struct ipv6hdr *hdr;
1535
1536         skb->protocol = htons(ETH_P_IPV6);
1537         skb->dev = dev;
1538
1539         skb_reset_network_header(skb);
1540         skb_put(skb, sizeof(struct ipv6hdr));
1541         hdr = ipv6_hdr(skb);
1542
1543         ip6_flow_hdr(hdr, 0, 0);
1544
1545         hdr->payload_len = htons(len);
1546         hdr->nexthdr = proto;
1547         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1548
1549         hdr->saddr = *saddr;
1550         hdr->daddr = *daddr;
1551 }
1552
1553 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1554 {
1555         struct net_device *dev = idev->dev;
1556         struct net *net = dev_net(dev);
1557         struct sock *sk = net->ipv6.igmp_sk;
1558         struct sk_buff *skb;
1559         struct mld2_report *pmr;
1560         struct in6_addr addr_buf;
1561         const struct in6_addr *saddr;
1562         int hlen = LL_RESERVED_SPACE(dev);
1563         int tlen = dev->needed_tailroom;
1564         unsigned int size = mtu + hlen + tlen;
1565         int err;
1566         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1567                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1568                      IPV6_TLV_PADN, 0 };
1569
1570         /* we assume size > sizeof(ra) here */
1571         /* limit our allocations to order-0 page */
1572         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1573         skb = sock_alloc_send_skb(sk, size, 1, &err);
1574
1575         if (!skb)
1576                 return NULL;
1577
1578         skb->priority = TC_PRIO_CONTROL;
1579         skb->reserved_tailroom = skb_end_offset(skb) -
1580                                  min(mtu, skb_end_offset(skb));
1581         skb_reserve(skb, hlen);
1582
1583         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1584                 /* <draft-ietf-magma-mld-source-05.txt>:
1585                  * use unspecified address as the source address
1586                  * when a valid link-local address is not available.
1587                  */
1588                 saddr = &in6addr_any;
1589         } else
1590                 saddr = &addr_buf;
1591
1592         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1593
1594         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1595
1596         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1597         skb_put(skb, sizeof(*pmr));
1598         pmr = (struct mld2_report *)skb_transport_header(skb);
1599         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1600         pmr->mld2r_resv1 = 0;
1601         pmr->mld2r_cksum = 0;
1602         pmr->mld2r_resv2 = 0;
1603         pmr->mld2r_ngrec = 0;
1604         return skb;
1605 }
1606
1607 static void mld_sendpack(struct sk_buff *skb)
1608 {
1609         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1610         struct mld2_report *pmr =
1611                               (struct mld2_report *)skb_transport_header(skb);
1612         int payload_len, mldlen;
1613         struct inet6_dev *idev;
1614         struct net *net = dev_net(skb->dev);
1615         int err;
1616         struct flowi6 fl6;
1617         struct dst_entry *dst;
1618
1619         rcu_read_lock();
1620         idev = __in6_dev_get(skb->dev);
1621         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1622
1623         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1624                 sizeof(*pip6);
1625         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1626         pip6->payload_len = htons(payload_len);
1627
1628         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1629                                            IPPROTO_ICMPV6,
1630                                            csum_partial(skb_transport_header(skb),
1631                                                         mldlen, 0));
1632
1633         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1634                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1635                          skb->dev->ifindex);
1636         dst = icmp6_dst_alloc(skb->dev, &fl6);
1637
1638         err = 0;
1639         if (IS_ERR(dst)) {
1640                 err = PTR_ERR(dst);
1641                 dst = NULL;
1642         }
1643         skb_dst_set(skb, dst);
1644         if (err)
1645                 goto err_out;
1646
1647         payload_len = skb->len;
1648
1649         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1650                       dst_output);
1651 out:
1652         if (!err) {
1653                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1654                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1655                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1656         } else {
1657                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1658         }
1659
1660         rcu_read_unlock();
1661         return;
1662
1663 err_out:
1664         kfree_skb(skb);
1665         goto out;
1666 }
1667
1668 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1669 {
1670         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1671 }
1672
1673 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1674         int type, struct mld2_grec **ppgr)
1675 {
1676         struct net_device *dev = pmc->idev->dev;
1677         struct mld2_report *pmr;
1678         struct mld2_grec *pgr;
1679
1680         if (!skb)
1681                 skb = mld_newpack(pmc->idev, dev->mtu);
1682         if (!skb)
1683                 return NULL;
1684         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1685         pgr->grec_type = type;
1686         pgr->grec_auxwords = 0;
1687         pgr->grec_nsrcs = 0;
1688         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1689         pmr = (struct mld2_report *)skb_transport_header(skb);
1690         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1691         *ppgr = pgr;
1692         return skb;
1693 }
1694
1695 #define AVAILABLE(skb)  ((skb) ? skb_availroom(skb) : 0)
1696
1697 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1698         int type, int gdeleted, int sdeleted, int crsend)
1699 {
1700         struct inet6_dev *idev = pmc->idev;
1701         struct net_device *dev = idev->dev;
1702         struct mld2_report *pmr;
1703         struct mld2_grec *pgr = NULL;
1704         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1705         int scount, stotal, first, isquery, truncate;
1706
1707         if (pmc->mca_flags & MAF_NOREPORT)
1708                 return skb;
1709
1710         isquery = type == MLD2_MODE_IS_INCLUDE ||
1711                   type == MLD2_MODE_IS_EXCLUDE;
1712         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1713                     type == MLD2_CHANGE_TO_EXCLUDE;
1714
1715         stotal = scount = 0;
1716
1717         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1718
1719         if (!*psf_list)
1720                 goto empty_source;
1721
1722         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1723
1724         /* EX and TO_EX get a fresh packet, if needed */
1725         if (truncate) {
1726                 if (pmr && pmr->mld2r_ngrec &&
1727                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1728                         if (skb)
1729                                 mld_sendpack(skb);
1730                         skb = mld_newpack(idev, dev->mtu);
1731                 }
1732         }
1733         first = 1;
1734         psf_prev = NULL;
1735         for (psf = *psf_list; psf; psf = psf_next) {
1736                 struct in6_addr *psrc;
1737
1738                 psf_next = psf->sf_next;
1739
1740                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1741                         psf_prev = psf;
1742                         continue;
1743                 }
1744
1745                 /* clear marks on query responses */
1746                 if (isquery)
1747                         psf->sf_gsresp = 0;
1748
1749                 if (AVAILABLE(skb) < sizeof(*psrc) +
1750                     first*sizeof(struct mld2_grec)) {
1751                         if (truncate && !first)
1752                                 break;   /* truncate these */
1753                         if (pgr)
1754                                 pgr->grec_nsrcs = htons(scount);
1755                         if (skb)
1756                                 mld_sendpack(skb);
1757                         skb = mld_newpack(idev, dev->mtu);
1758                         first = 1;
1759                         scount = 0;
1760                 }
1761                 if (first) {
1762                         skb = add_grhead(skb, pmc, type, &pgr);
1763                         first = 0;
1764                 }
1765                 if (!skb)
1766                         return NULL;
1767                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1768                 *psrc = psf->sf_addr;
1769                 scount++; stotal++;
1770                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1771                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1772                         psf->sf_crcount--;
1773                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1774                                 if (psf_prev)
1775                                         psf_prev->sf_next = psf->sf_next;
1776                                 else
1777                                         *psf_list = psf->sf_next;
1778                                 kfree(psf);
1779                                 continue;
1780                         }
1781                 }
1782                 psf_prev = psf;
1783         }
1784
1785 empty_source:
1786         if (!stotal) {
1787                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1788                     type == MLD2_BLOCK_OLD_SOURCES)
1789                         return skb;
1790                 if (pmc->mca_crcount || isquery || crsend) {
1791                         /* make sure we have room for group header */
1792                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1793                                 mld_sendpack(skb);
1794                                 skb = NULL; /* add_grhead will get a new one */
1795                         }
1796                         skb = add_grhead(skb, pmc, type, &pgr);
1797                 }
1798         }
1799         if (pgr)
1800                 pgr->grec_nsrcs = htons(scount);
1801
1802         if (isquery)
1803                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1804         return skb;
1805 }
1806
1807 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1808 {
1809         struct sk_buff *skb = NULL;
1810         int type;
1811
1812         read_lock_bh(&idev->lock);
1813         if (!pmc) {
1814                 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1815                         if (pmc->mca_flags & MAF_NOREPORT)
1816                                 continue;
1817                         spin_lock_bh(&pmc->mca_lock);
1818                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1819                                 type = MLD2_MODE_IS_EXCLUDE;
1820                         else
1821                                 type = MLD2_MODE_IS_INCLUDE;
1822                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1823                         spin_unlock_bh(&pmc->mca_lock);
1824                 }
1825         } else {
1826                 spin_lock_bh(&pmc->mca_lock);
1827                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1828                         type = MLD2_MODE_IS_EXCLUDE;
1829                 else
1830                         type = MLD2_MODE_IS_INCLUDE;
1831                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1832                 spin_unlock_bh(&pmc->mca_lock);
1833         }
1834         read_unlock_bh(&idev->lock);
1835         if (skb)
1836                 mld_sendpack(skb);
1837 }
1838
1839 /*
1840  * remove zero-count source records from a source filter list
1841  */
1842 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1843 {
1844         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1845
1846         psf_prev = NULL;
1847         for (psf = *ppsf; psf; psf = psf_next) {
1848                 psf_next = psf->sf_next;
1849                 if (psf->sf_crcount == 0) {
1850                         if (psf_prev)
1851                                 psf_prev->sf_next = psf->sf_next;
1852                         else
1853                                 *ppsf = psf->sf_next;
1854                         kfree(psf);
1855                 } else
1856                         psf_prev = psf;
1857         }
1858 }
1859
1860 static void mld_send_cr(struct inet6_dev *idev)
1861 {
1862         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1863         struct sk_buff *skb = NULL;
1864         int type, dtype;
1865
1866         read_lock_bh(&idev->lock);
1867         spin_lock(&idev->mc_lock);
1868
1869         /* deleted MCA's */
1870         pmc_prev = NULL;
1871         for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1872                 pmc_next = pmc->next;
1873                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1874                         type = MLD2_BLOCK_OLD_SOURCES;
1875                         dtype = MLD2_BLOCK_OLD_SOURCES;
1876                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1877                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1878                 }
1879                 if (pmc->mca_crcount) {
1880                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1881                                 type = MLD2_CHANGE_TO_INCLUDE;
1882                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1883                         }
1884                         pmc->mca_crcount--;
1885                         if (pmc->mca_crcount == 0) {
1886                                 mld_clear_zeros(&pmc->mca_tomb);
1887                                 mld_clear_zeros(&pmc->mca_sources);
1888                         }
1889                 }
1890                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1891                     !pmc->mca_sources) {
1892                         if (pmc_prev)
1893                                 pmc_prev->next = pmc_next;
1894                         else
1895                                 idev->mc_tomb = pmc_next;
1896                         in6_dev_put(pmc->idev);
1897                         kfree(pmc);
1898                 } else
1899                         pmc_prev = pmc;
1900         }
1901         spin_unlock(&idev->mc_lock);
1902
1903         /* change recs */
1904         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1905                 spin_lock_bh(&pmc->mca_lock);
1906                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1907                         type = MLD2_BLOCK_OLD_SOURCES;
1908                         dtype = MLD2_ALLOW_NEW_SOURCES;
1909                 } else {
1910                         type = MLD2_ALLOW_NEW_SOURCES;
1911                         dtype = MLD2_BLOCK_OLD_SOURCES;
1912                 }
1913                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1914                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1915
1916                 /* filter mode changes */
1917                 if (pmc->mca_crcount) {
1918                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1919                                 type = MLD2_CHANGE_TO_EXCLUDE;
1920                         else
1921                                 type = MLD2_CHANGE_TO_INCLUDE;
1922                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1923                         pmc->mca_crcount--;
1924                 }
1925                 spin_unlock_bh(&pmc->mca_lock);
1926         }
1927         read_unlock_bh(&idev->lock);
1928         if (!skb)
1929                 return;
1930         (void) mld_sendpack(skb);
1931 }
1932
1933 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1934 {
1935         struct net *net = dev_net(dev);
1936         struct sock *sk = net->ipv6.igmp_sk;
1937         struct inet6_dev *idev;
1938         struct sk_buff *skb;
1939         struct mld_msg *hdr;
1940         const struct in6_addr *snd_addr, *saddr;
1941         struct in6_addr addr_buf;
1942         int hlen = LL_RESERVED_SPACE(dev);
1943         int tlen = dev->needed_tailroom;
1944         int err, len, payload_len, full_len;
1945         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1946                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1947                      IPV6_TLV_PADN, 0 };
1948         struct flowi6 fl6;
1949         struct dst_entry *dst;
1950
1951         if (type == ICMPV6_MGM_REDUCTION)
1952                 snd_addr = &in6addr_linklocal_allrouters;
1953         else
1954                 snd_addr = addr;
1955
1956         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1957         payload_len = len + sizeof(ra);
1958         full_len = sizeof(struct ipv6hdr) + payload_len;
1959
1960         rcu_read_lock();
1961         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1962                       IPSTATS_MIB_OUT, full_len);
1963         rcu_read_unlock();
1964
1965         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1966
1967         if (skb == NULL) {
1968                 rcu_read_lock();
1969                 IP6_INC_STATS(net, __in6_dev_get(dev),
1970                               IPSTATS_MIB_OUTDISCARDS);
1971                 rcu_read_unlock();
1972                 return;
1973         }
1974         skb->priority = TC_PRIO_CONTROL;
1975         skb_reserve(skb, hlen);
1976
1977         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1978                 /* <draft-ietf-magma-mld-source-05.txt>:
1979                  * use unspecified address as the source address
1980                  * when a valid link-local address is not available.
1981                  */
1982                 saddr = &in6addr_any;
1983         } else
1984                 saddr = &addr_buf;
1985
1986         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1987
1988         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1989
1990         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1991         memset(hdr, 0, sizeof(struct mld_msg));
1992         hdr->mld_type = type;
1993         hdr->mld_mca = *addr;
1994
1995         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1996                                          IPPROTO_ICMPV6,
1997                                          csum_partial(hdr, len, 0));
1998
1999         rcu_read_lock();
2000         idev = __in6_dev_get(skb->dev);
2001
2002         icmpv6_flow_init(sk, &fl6, type,
2003                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2004                          skb->dev->ifindex);
2005         dst = icmp6_dst_alloc(skb->dev, &fl6);
2006         if (IS_ERR(dst)) {
2007                 err = PTR_ERR(dst);
2008                 goto err_out;
2009         }
2010
2011         skb_dst_set(skb, dst);
2012         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
2013                       dst_output);
2014 out:
2015         if (!err) {
2016                 ICMP6MSGOUT_INC_STATS(net, idev, type);
2017                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2018                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
2019         } else
2020                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2021
2022         rcu_read_unlock();
2023         return;
2024
2025 err_out:
2026         kfree_skb(skb);
2027         goto out;
2028 }
2029
2030 static void mld_send_initial_cr(struct inet6_dev *idev)
2031 {
2032         struct sk_buff *skb;
2033         struct ifmcaddr6 *pmc;
2034         int type;
2035
2036         if (mld_in_v1_mode(idev))
2037                 return;
2038
2039         skb = NULL;
2040         read_lock_bh(&idev->lock);
2041         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2042                 spin_lock_bh(&pmc->mca_lock);
2043                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2044                         type = MLD2_CHANGE_TO_EXCLUDE;
2045                 else
2046                         type = MLD2_CHANGE_TO_INCLUDE;
2047                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2048                 spin_unlock_bh(&pmc->mca_lock);
2049         }
2050         read_unlock_bh(&idev->lock);
2051         if (skb)
2052                 mld_sendpack(skb);
2053 }
2054
2055 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2056 {
2057         idev->mc_dad_count = idev->mc_qrv;
2058         if (idev->mc_dad_count) {
2059                 mld_send_initial_cr(idev);
2060                 idev->mc_dad_count--;
2061                 if (idev->mc_dad_count)
2062                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2063         }
2064 }
2065
2066 static void mld_dad_timer_expire(unsigned long data)
2067 {
2068         struct inet6_dev *idev = (struct inet6_dev *)data;
2069
2070         mld_send_initial_cr(idev);
2071         if (idev->mc_dad_count) {
2072                 idev->mc_dad_count--;
2073                 if (idev->mc_dad_count)
2074                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2075         }
2076         in6_dev_put(idev);
2077 }
2078
2079 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2080         const struct in6_addr *psfsrc)
2081 {
2082         struct ip6_sf_list *psf, *psf_prev;
2083         int rv = 0;
2084
2085         psf_prev = NULL;
2086         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2087                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2088                         break;
2089                 psf_prev = psf;
2090         }
2091         if (!psf || psf->sf_count[sfmode] == 0) {
2092                 /* source filter not found, or count wrong =>  bug */
2093                 return -ESRCH;
2094         }
2095         psf->sf_count[sfmode]--;
2096         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2097                 struct inet6_dev *idev = pmc->idev;
2098
2099                 /* no more filters for this source */
2100                 if (psf_prev)
2101                         psf_prev->sf_next = psf->sf_next;
2102                 else
2103                         pmc->mca_sources = psf->sf_next;
2104                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2105                     !mld_in_v1_mode(idev)) {
2106                         psf->sf_crcount = idev->mc_qrv;
2107                         psf->sf_next = pmc->mca_tomb;
2108                         pmc->mca_tomb = psf;
2109                         rv = 1;
2110                 } else
2111                         kfree(psf);
2112         }
2113         return rv;
2114 }
2115
2116 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2117                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2118                           int delta)
2119 {
2120         struct ifmcaddr6 *pmc;
2121         int     changerec = 0;
2122         int     i, err;
2123
2124         if (!idev)
2125                 return -ENODEV;
2126         read_lock_bh(&idev->lock);
2127         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2128                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2129                         break;
2130         }
2131         if (!pmc) {
2132                 /* MCA not found?? bug */
2133                 read_unlock_bh(&idev->lock);
2134                 return -ESRCH;
2135         }
2136         spin_lock_bh(&pmc->mca_lock);
2137         sf_markstate(pmc);
2138         if (!delta) {
2139                 if (!pmc->mca_sfcount[sfmode]) {
2140                         spin_unlock_bh(&pmc->mca_lock);
2141                         read_unlock_bh(&idev->lock);
2142                         return -EINVAL;
2143                 }
2144                 pmc->mca_sfcount[sfmode]--;
2145         }
2146         err = 0;
2147         for (i = 0; i < sfcount; i++) {
2148                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2149
2150                 changerec |= rv > 0;
2151                 if (!err && rv < 0)
2152                         err = rv;
2153         }
2154         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2155             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2156             pmc->mca_sfcount[MCAST_INCLUDE]) {
2157                 struct ip6_sf_list *psf;
2158
2159                 /* filter mode change */
2160                 pmc->mca_sfmode = MCAST_INCLUDE;
2161                 pmc->mca_crcount = idev->mc_qrv;
2162                 idev->mc_ifc_count = pmc->mca_crcount;
2163                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2164                         psf->sf_crcount = 0;
2165                 mld_ifc_event(pmc->idev);
2166         } else if (sf_setstate(pmc) || changerec)
2167                 mld_ifc_event(pmc->idev);
2168         spin_unlock_bh(&pmc->mca_lock);
2169         read_unlock_bh(&idev->lock);
2170         return err;
2171 }
2172
2173 /*
2174  * Add multicast single-source filter to the interface list
2175  */
2176 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2177         const struct in6_addr *psfsrc)
2178 {
2179         struct ip6_sf_list *psf, *psf_prev;
2180
2181         psf_prev = NULL;
2182         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2183                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2184                         break;
2185                 psf_prev = psf;
2186         }
2187         if (!psf) {
2188                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2189                 if (!psf)
2190                         return -ENOBUFS;
2191
2192                 psf->sf_addr = *psfsrc;
2193                 if (psf_prev) {
2194                         psf_prev->sf_next = psf;
2195                 } else
2196                         pmc->mca_sources = psf;
2197         }
2198         psf->sf_count[sfmode]++;
2199         return 0;
2200 }
2201
2202 static void sf_markstate(struct ifmcaddr6 *pmc)
2203 {
2204         struct ip6_sf_list *psf;
2205         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2206
2207         for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2208                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2209                         psf->sf_oldin = mca_xcount ==
2210                                 psf->sf_count[MCAST_EXCLUDE] &&
2211                                 !psf->sf_count[MCAST_INCLUDE];
2212                 } else
2213                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2214 }
2215
2216 static int sf_setstate(struct ifmcaddr6 *pmc)
2217 {
2218         struct ip6_sf_list *psf, *dpsf;
2219         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2220         int qrv = pmc->idev->mc_qrv;
2221         int new_in, rv;
2222
2223         rv = 0;
2224         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2225                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2226                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2227                                 !psf->sf_count[MCAST_INCLUDE];
2228                 } else
2229                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2230                 if (new_in) {
2231                         if (!psf->sf_oldin) {
2232                                 struct ip6_sf_list *prev = NULL;
2233
2234                                 for (dpsf = pmc->mca_tomb; dpsf;
2235                                      dpsf = dpsf->sf_next) {
2236                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2237                                             &psf->sf_addr))
2238                                                 break;
2239                                         prev = dpsf;
2240                                 }
2241                                 if (dpsf) {
2242                                         if (prev)
2243                                                 prev->sf_next = dpsf->sf_next;
2244                                         else
2245                                                 pmc->mca_tomb = dpsf->sf_next;
2246                                         kfree(dpsf);
2247                                 }
2248                                 psf->sf_crcount = qrv;
2249                                 rv++;
2250                         }
2251                 } else if (psf->sf_oldin) {
2252                         psf->sf_crcount = 0;
2253                         /*
2254                          * add or update "delete" records if an active filter
2255                          * is now inactive
2256                          */
2257                         for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2258                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2259                                     &psf->sf_addr))
2260                                         break;
2261                         if (!dpsf) {
2262                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2263                                 if (!dpsf)
2264                                         continue;
2265                                 *dpsf = *psf;
2266                                 /* pmc->mca_lock held by callers */
2267                                 dpsf->sf_next = pmc->mca_tomb;
2268                                 pmc->mca_tomb = dpsf;
2269                         }
2270                         dpsf->sf_crcount = qrv;
2271                         rv++;
2272                 }
2273         }
2274         return rv;
2275 }
2276
2277 /*
2278  * Add multicast source filter list to the interface list
2279  */
2280 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2281                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2282                           int delta)
2283 {
2284         struct ifmcaddr6 *pmc;
2285         int     isexclude;
2286         int     i, err;
2287
2288         if (!idev)
2289                 return -ENODEV;
2290         read_lock_bh(&idev->lock);
2291         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2292                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2293                         break;
2294         }
2295         if (!pmc) {
2296                 /* MCA not found?? bug */
2297                 read_unlock_bh(&idev->lock);
2298                 return -ESRCH;
2299         }
2300         spin_lock_bh(&pmc->mca_lock);
2301
2302         sf_markstate(pmc);
2303         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2304         if (!delta)
2305                 pmc->mca_sfcount[sfmode]++;
2306         err = 0;
2307         for (i = 0; i < sfcount; i++) {
2308                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2309                 if (err)
2310                         break;
2311         }
2312         if (err) {
2313                 int j;
2314
2315                 if (!delta)
2316                         pmc->mca_sfcount[sfmode]--;
2317                 for (j = 0; j < i; j++)
2318                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2319         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2320                 struct ip6_sf_list *psf;
2321
2322                 /* filter mode change */
2323                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2324                         pmc->mca_sfmode = MCAST_EXCLUDE;
2325                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2326                         pmc->mca_sfmode = MCAST_INCLUDE;
2327                 /* else no filters; keep old mode for reports */
2328
2329                 pmc->mca_crcount = idev->mc_qrv;
2330                 idev->mc_ifc_count = pmc->mca_crcount;
2331                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2332                         psf->sf_crcount = 0;
2333                 mld_ifc_event(idev);
2334         } else if (sf_setstate(pmc))
2335                 mld_ifc_event(idev);
2336         spin_unlock_bh(&pmc->mca_lock);
2337         read_unlock_bh(&idev->lock);
2338         return err;
2339 }
2340
2341 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2342 {
2343         struct ip6_sf_list *psf, *nextpsf;
2344
2345         for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2346                 nextpsf = psf->sf_next;
2347                 kfree(psf);
2348         }
2349         pmc->mca_tomb = NULL;
2350         for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2351                 nextpsf = psf->sf_next;
2352                 kfree(psf);
2353         }
2354         pmc->mca_sources = NULL;
2355         pmc->mca_sfmode = MCAST_EXCLUDE;
2356         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2357         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2358 }
2359
2360
2361 static void igmp6_join_group(struct ifmcaddr6 *ma)
2362 {
2363         unsigned long delay;
2364
2365         if (ma->mca_flags & MAF_NOREPORT)
2366                 return;
2367
2368         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2369
2370         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2371
2372         spin_lock_bh(&ma->mca_lock);
2373         if (del_timer(&ma->mca_timer)) {
2374                 atomic_dec(&ma->mca_refcnt);
2375                 delay = ma->mca_timer.expires - jiffies;
2376         }
2377
2378         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2379                 atomic_inc(&ma->mca_refcnt);
2380         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2381         spin_unlock_bh(&ma->mca_lock);
2382 }
2383
2384 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2385                             struct inet6_dev *idev)
2386 {
2387         int err;
2388
2389         /* callers have the socket lock and rtnl lock
2390          * so no other readers or writers of iml or its sflist
2391          */
2392         if (!iml->sflist) {
2393                 /* any-source empty exclude case */
2394                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2395         }
2396         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2397                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2398         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2399         iml->sflist = NULL;
2400         return err;
2401 }
2402
2403 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2404 {
2405         if (mld_in_v1_mode(ma->idev)) {
2406                 if (ma->mca_flags & MAF_LAST_REPORTER)
2407                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2408                                 ICMPV6_MGM_REDUCTION);
2409         } else {
2410                 mld_add_delrec(ma->idev, ma);
2411                 mld_ifc_event(ma->idev);
2412         }
2413 }
2414
2415 static void mld_gq_timer_expire(unsigned long data)
2416 {
2417         struct inet6_dev *idev = (struct inet6_dev *)data;
2418
2419         idev->mc_gq_running = 0;
2420         mld_send_report(idev, NULL);
2421         in6_dev_put(idev);
2422 }
2423
2424 static void mld_ifc_timer_expire(unsigned long data)
2425 {
2426         struct inet6_dev *idev = (struct inet6_dev *)data;
2427
2428         mld_send_cr(idev);
2429         if (idev->mc_ifc_count) {
2430                 idev->mc_ifc_count--;
2431                 if (idev->mc_ifc_count)
2432                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2433         }
2434         in6_dev_put(idev);
2435 }
2436
2437 static void mld_ifc_event(struct inet6_dev *idev)
2438 {
2439         if (mld_in_v1_mode(idev))
2440                 return;
2441         idev->mc_ifc_count = idev->mc_qrv;
2442         mld_ifc_start_timer(idev, 1);
2443 }
2444
2445
2446 static void igmp6_timer_handler(unsigned long data)
2447 {
2448         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2449
2450         if (mld_in_v1_mode(ma->idev))
2451                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2452         else
2453                 mld_send_report(ma->idev, ma);
2454
2455         spin_lock(&ma->mca_lock);
2456         ma->mca_flags |=  MAF_LAST_REPORTER;
2457         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2458         spin_unlock(&ma->mca_lock);
2459         ma_put(ma);
2460 }
2461
2462 /* Device changing type */
2463
2464 void ipv6_mc_unmap(struct inet6_dev *idev)
2465 {
2466         struct ifmcaddr6 *i;
2467
2468         /* Install multicast list, except for all-nodes (already installed) */
2469
2470         read_lock_bh(&idev->lock);
2471         for (i = idev->mc_list; i; i = i->next)
2472                 igmp6_group_dropped(i);
2473         read_unlock_bh(&idev->lock);
2474 }
2475
2476 void ipv6_mc_remap(struct inet6_dev *idev)
2477 {
2478         ipv6_mc_up(idev);
2479 }
2480
2481 /* Device going down */
2482
2483 void ipv6_mc_down(struct inet6_dev *idev)
2484 {
2485         struct ifmcaddr6 *i;
2486
2487         /* Withdraw multicast list */
2488
2489         read_lock_bh(&idev->lock);
2490         mld_ifc_stop_timer(idev);
2491         mld_gq_stop_timer(idev);
2492         mld_dad_stop_timer(idev);
2493
2494         for (i = idev->mc_list; i; i = i->next)
2495                 igmp6_group_dropped(i);
2496         read_unlock_bh(&idev->lock);
2497
2498         mld_clear_delrec(idev);
2499 }
2500
2501 static void ipv6_mc_reset(struct inet6_dev *idev)
2502 {
2503         idev->mc_qrv = sysctl_mld_qrv;
2504         idev->mc_qi = MLD_QI_DEFAULT;
2505         idev->mc_qri = MLD_QRI_DEFAULT;
2506         idev->mc_v1_seen = 0;
2507         idev->mc_maxdelay = unsolicited_report_interval(idev);
2508 }
2509
2510 /* Device going up */
2511
2512 void ipv6_mc_up(struct inet6_dev *idev)
2513 {
2514         struct ifmcaddr6 *i;
2515
2516         /* Install multicast list, except for all-nodes (already installed) */
2517
2518         read_lock_bh(&idev->lock);
2519         ipv6_mc_reset(idev);
2520         for (i = idev->mc_list; i; i = i->next)
2521                 igmp6_group_added(i);
2522         read_unlock_bh(&idev->lock);
2523 }
2524
2525 /* IPv6 device initialization. */
2526
2527 void ipv6_mc_init_dev(struct inet6_dev *idev)
2528 {
2529         write_lock_bh(&idev->lock);
2530         spin_lock_init(&idev->mc_lock);
2531         idev->mc_gq_running = 0;
2532         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2533                         (unsigned long)idev);
2534         idev->mc_tomb = NULL;
2535         idev->mc_ifc_count = 0;
2536         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2537                         (unsigned long)idev);
2538         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2539                     (unsigned long)idev);
2540         ipv6_mc_reset(idev);
2541         write_unlock_bh(&idev->lock);
2542 }
2543
2544 /*
2545  *      Device is about to be destroyed: clean up.
2546  */
2547
2548 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2549 {
2550         struct ifmcaddr6 *i;
2551
2552         /* Deactivate timers */
2553         ipv6_mc_down(idev);
2554
2555         /* Delete all-nodes address. */
2556         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2557          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2558          * fail.
2559          */
2560         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2561
2562         if (idev->cnf.forwarding)
2563                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2564
2565         write_lock_bh(&idev->lock);
2566         while ((i = idev->mc_list) != NULL) {
2567                 idev->mc_list = i->next;
2568                 write_unlock_bh(&idev->lock);
2569
2570                 igmp6_group_dropped(i);
2571                 ma_put(i);
2572
2573                 write_lock_bh(&idev->lock);
2574         }
2575         write_unlock_bh(&idev->lock);
2576 }
2577
2578 #ifdef CONFIG_PROC_FS
2579 struct igmp6_mc_iter_state {
2580         struct seq_net_private p;
2581         struct net_device *dev;
2582         struct inet6_dev *idev;
2583 };
2584
2585 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2586
2587 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2588 {
2589         struct ifmcaddr6 *im = NULL;
2590         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2591         struct net *net = seq_file_net(seq);
2592
2593         state->idev = NULL;
2594         for_each_netdev_rcu(net, state->dev) {
2595                 struct inet6_dev *idev;
2596                 idev = __in6_dev_get(state->dev);
2597                 if (!idev)
2598                         continue;
2599                 read_lock_bh(&idev->lock);
2600                 im = idev->mc_list;
2601                 if (im) {
2602                         state->idev = idev;
2603                         break;
2604                 }
2605                 read_unlock_bh(&idev->lock);
2606         }
2607         return im;
2608 }
2609
2610 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2611 {
2612         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2613
2614         im = im->next;
2615         while (!im) {
2616                 if (likely(state->idev != NULL))
2617                         read_unlock_bh(&state->idev->lock);
2618
2619                 state->dev = next_net_device_rcu(state->dev);
2620                 if (!state->dev) {
2621                         state->idev = NULL;
2622                         break;
2623                 }
2624                 state->idev = __in6_dev_get(state->dev);
2625                 if (!state->idev)
2626                         continue;
2627                 read_lock_bh(&state->idev->lock);
2628                 im = state->idev->mc_list;
2629         }
2630         return im;
2631 }
2632
2633 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2634 {
2635         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2636         if (im)
2637                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2638                         --pos;
2639         return pos ? NULL : im;
2640 }
2641
2642 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2643         __acquires(RCU)
2644 {
2645         rcu_read_lock();
2646         return igmp6_mc_get_idx(seq, *pos);
2647 }
2648
2649 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2650 {
2651         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2652
2653         ++*pos;
2654         return im;
2655 }
2656
2657 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2658         __releases(RCU)
2659 {
2660         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2661
2662         if (likely(state->idev != NULL)) {
2663                 read_unlock_bh(&state->idev->lock);
2664                 state->idev = NULL;
2665         }
2666         state->dev = NULL;
2667         rcu_read_unlock();
2668 }
2669
2670 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2671 {
2672         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2673         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2674
2675         seq_printf(seq,
2676                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2677                    state->dev->ifindex, state->dev->name,
2678                    &im->mca_addr,
2679                    im->mca_users, im->mca_flags,
2680                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2681                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2682         return 0;
2683 }
2684
2685 static const struct seq_operations igmp6_mc_seq_ops = {
2686         .start  =       igmp6_mc_seq_start,
2687         .next   =       igmp6_mc_seq_next,
2688         .stop   =       igmp6_mc_seq_stop,
2689         .show   =       igmp6_mc_seq_show,
2690 };
2691
2692 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2693 {
2694         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2695                             sizeof(struct igmp6_mc_iter_state));
2696 }
2697
2698 static const struct file_operations igmp6_mc_seq_fops = {
2699         .owner          =       THIS_MODULE,
2700         .open           =       igmp6_mc_seq_open,
2701         .read           =       seq_read,
2702         .llseek         =       seq_lseek,
2703         .release        =       seq_release_net,
2704 };
2705
2706 struct igmp6_mcf_iter_state {
2707         struct seq_net_private p;
2708         struct net_device *dev;
2709         struct inet6_dev *idev;
2710         struct ifmcaddr6 *im;
2711 };
2712
2713 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2714
2715 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2716 {
2717         struct ip6_sf_list *psf = NULL;
2718         struct ifmcaddr6 *im = NULL;
2719         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2720         struct net *net = seq_file_net(seq);
2721
2722         state->idev = NULL;
2723         state->im = NULL;
2724         for_each_netdev_rcu(net, state->dev) {
2725                 struct inet6_dev *idev;
2726                 idev = __in6_dev_get(state->dev);
2727                 if (unlikely(idev == NULL))
2728                         continue;
2729                 read_lock_bh(&idev->lock);
2730                 im = idev->mc_list;
2731                 if (likely(im != NULL)) {
2732                         spin_lock_bh(&im->mca_lock);
2733                         psf = im->mca_sources;
2734                         if (likely(psf != NULL)) {
2735                                 state->im = im;
2736                                 state->idev = idev;
2737                                 break;
2738                         }
2739                         spin_unlock_bh(&im->mca_lock);
2740                 }
2741                 read_unlock_bh(&idev->lock);
2742         }
2743         return psf;
2744 }
2745
2746 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2747 {
2748         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2749
2750         psf = psf->sf_next;
2751         while (!psf) {
2752                 spin_unlock_bh(&state->im->mca_lock);
2753                 state->im = state->im->next;
2754                 while (!state->im) {
2755                         if (likely(state->idev != NULL))
2756                                 read_unlock_bh(&state->idev->lock);
2757
2758                         state->dev = next_net_device_rcu(state->dev);
2759                         if (!state->dev) {
2760                                 state->idev = NULL;
2761                                 goto out;
2762                         }
2763                         state->idev = __in6_dev_get(state->dev);
2764                         if (!state->idev)
2765                                 continue;
2766                         read_lock_bh(&state->idev->lock);
2767                         state->im = state->idev->mc_list;
2768                 }
2769                 if (!state->im)
2770                         break;
2771                 spin_lock_bh(&state->im->mca_lock);
2772                 psf = state->im->mca_sources;
2773         }
2774 out:
2775         return psf;
2776 }
2777
2778 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2779 {
2780         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2781         if (psf)
2782                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2783                         --pos;
2784         return pos ? NULL : psf;
2785 }
2786
2787 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2788         __acquires(RCU)
2789 {
2790         rcu_read_lock();
2791         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2792 }
2793
2794 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2795 {
2796         struct ip6_sf_list *psf;
2797         if (v == SEQ_START_TOKEN)
2798                 psf = igmp6_mcf_get_first(seq);
2799         else
2800                 psf = igmp6_mcf_get_next(seq, v);
2801         ++*pos;
2802         return psf;
2803 }
2804
2805 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2806         __releases(RCU)
2807 {
2808         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2809         if (likely(state->im != NULL)) {
2810                 spin_unlock_bh(&state->im->mca_lock);
2811                 state->im = NULL;
2812         }
2813         if (likely(state->idev != NULL)) {
2814                 read_unlock_bh(&state->idev->lock);
2815                 state->idev = NULL;
2816         }
2817         state->dev = NULL;
2818         rcu_read_unlock();
2819 }
2820
2821 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2822 {
2823         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2824         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2825
2826         if (v == SEQ_START_TOKEN) {
2827                 seq_puts(seq, "Idx Device                Multicast Address                   Source Address    INC    EXC\n");
2828         } else {
2829                 seq_printf(seq,
2830                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2831                            state->dev->ifindex, state->dev->name,
2832                            &state->im->mca_addr,
2833                            &psf->sf_addr,
2834                            psf->sf_count[MCAST_INCLUDE],
2835                            psf->sf_count[MCAST_EXCLUDE]);
2836         }
2837         return 0;
2838 }
2839
2840 static const struct seq_operations igmp6_mcf_seq_ops = {
2841         .start  =       igmp6_mcf_seq_start,
2842         .next   =       igmp6_mcf_seq_next,
2843         .stop   =       igmp6_mcf_seq_stop,
2844         .show   =       igmp6_mcf_seq_show,
2845 };
2846
2847 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2848 {
2849         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2850                             sizeof(struct igmp6_mcf_iter_state));
2851 }
2852
2853 static const struct file_operations igmp6_mcf_seq_fops = {
2854         .owner          =       THIS_MODULE,
2855         .open           =       igmp6_mcf_seq_open,
2856         .read           =       seq_read,
2857         .llseek         =       seq_lseek,
2858         .release        =       seq_release_net,
2859 };
2860
2861 static int __net_init igmp6_proc_init(struct net *net)
2862 {
2863         int err;
2864
2865         err = -ENOMEM;
2866         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2867                 goto out;
2868         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2869                          &igmp6_mcf_seq_fops))
2870                 goto out_proc_net_igmp6;
2871
2872         err = 0;
2873 out:
2874         return err;
2875
2876 out_proc_net_igmp6:
2877         remove_proc_entry("igmp6", net->proc_net);
2878         goto out;
2879 }
2880
2881 static void __net_exit igmp6_proc_exit(struct net *net)
2882 {
2883         remove_proc_entry("mcfilter6", net->proc_net);
2884         remove_proc_entry("igmp6", net->proc_net);
2885 }
2886 #else
2887 static inline int igmp6_proc_init(struct net *net)
2888 {
2889         return 0;
2890 }
2891 static inline void igmp6_proc_exit(struct net *net)
2892 {
2893 }
2894 #endif
2895
2896 static int __net_init igmp6_net_init(struct net *net)
2897 {
2898         int err;
2899
2900         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2901                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2902         if (err < 0) {
2903                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2904                        err);
2905                 goto out;
2906         }
2907
2908         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2909
2910         err = igmp6_proc_init(net);
2911         if (err)
2912                 goto out_sock_create;
2913 out:
2914         return err;
2915
2916 out_sock_create:
2917         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2918         goto out;
2919 }
2920
2921 static void __net_exit igmp6_net_exit(struct net *net)
2922 {
2923         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2924         igmp6_proc_exit(net);
2925 }
2926
2927 static struct pernet_operations igmp6_net_ops = {
2928         .init = igmp6_net_init,
2929         .exit = igmp6_net_exit,
2930 };
2931
2932 int __init igmp6_init(void)
2933 {
2934         return register_pernet_subsys(&igmp6_net_ops);
2935 }
2936
2937 void igmp6_cleanup(void)
2938 {
2939         unregister_pernet_subsys(&igmp6_net_ops);
2940 }