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)
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 router present */
1249         mldv1_md = ntohs(mld->mld_maxdelay);
1250         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1251
1252         mld_set_v1_mode(idev);
1253
1254         /* cancel MLDv2 report timer */
1255         mld_gq_stop_timer(idev);
1256         /* cancel the interface change timer */
1257         mld_ifc_stop_timer(idev);
1258         /* clear deleted report items */
1259         mld_clear_delrec(idev);
1260
1261         return 0;
1262 }
1263
1264 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1265                           unsigned long *max_delay)
1266 {
1267         /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
1268         if (mld_in_v1_mode(idev))
1269                 return -EINVAL;
1270
1271         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1272
1273         mld_update_qrv(idev, mld);
1274         mld_update_qi(idev, mld);
1275         mld_update_qri(idev, mld);
1276
1277         idev->mc_maxdelay = *max_delay;
1278
1279         return 0;
1280 }
1281
1282 /* called with rcu_read_lock() */
1283 int igmp6_event_query(struct sk_buff *skb)
1284 {
1285         struct mld2_query *mlh2 = NULL;
1286         struct ifmcaddr6 *ma;
1287         const struct in6_addr *group;
1288         unsigned long max_delay;
1289         struct inet6_dev *idev;
1290         struct mld_msg *mld;
1291         int group_type;
1292         int mark = 0;
1293         int len, err;
1294
1295         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1296                 return -EINVAL;
1297
1298         /* compute payload length excluding extension headers */
1299         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1300         len -= skb_network_header_len(skb);
1301
1302         /* RFC3810 6.2
1303          * Upon reception of an MLD message that contains a Query, the node
1304          * checks if the source address of the message is a valid link-local
1305          * address, if the Hop Limit is set to 1, and if the Router Alert
1306          * option is present in the Hop-By-Hop Options header of the IPv6
1307          * packet.  If any of these checks fails, the packet is dropped.
1308          */
1309         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1310             ipv6_hdr(skb)->hop_limit != 1 ||
1311             !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1312             IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1313                 return -EINVAL;
1314
1315         idev = __in6_dev_get(skb->dev);
1316         if (idev == NULL)
1317                 return 0;
1318
1319         mld = (struct mld_msg *)icmp6_hdr(skb);
1320         group = &mld->mld_mca;
1321         group_type = ipv6_addr_type(group);
1322
1323         if (group_type != IPV6_ADDR_ANY &&
1324             !(group_type&IPV6_ADDR_MULTICAST))
1325                 return -EINVAL;
1326
1327         if (len == MLD_V1_QUERY_LEN) {
1328                 err = mld_process_v1(idev, mld, &max_delay);
1329                 if (err < 0)
1330                         return err;
1331         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1332                 int srcs_offset = sizeof(struct mld2_query) -
1333                                   sizeof(struct icmp6hdr);
1334
1335                 if (!pskb_may_pull(skb, srcs_offset))
1336                         return -EINVAL;
1337
1338                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1339
1340                 err = mld_process_v2(idev, mlh2, &max_delay);
1341                 if (err < 0)
1342                         return err;
1343
1344                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1345                         if (mlh2->mld2q_nsrcs)
1346                                 return -EINVAL; /* no sources allowed */
1347
1348                         mld_gq_start_timer(idev);
1349                         return 0;
1350                 }
1351                 /* mark sources to include, if group & source-specific */
1352                 if (mlh2->mld2q_nsrcs != 0) {
1353                         if (!pskb_may_pull(skb, srcs_offset +
1354                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1355                                 return -EINVAL;
1356
1357                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1358                         mark = 1;
1359                 }
1360         } else
1361                 return -EINVAL;
1362
1363         read_lock_bh(&idev->lock);
1364         if (group_type == IPV6_ADDR_ANY) {
1365                 for (ma = idev->mc_list; ma; ma = ma->next) {
1366                         spin_lock_bh(&ma->mca_lock);
1367                         igmp6_group_queried(ma, max_delay);
1368                         spin_unlock_bh(&ma->mca_lock);
1369                 }
1370         } else {
1371                 for (ma = idev->mc_list; ma; ma = ma->next) {
1372                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1373                                 continue;
1374                         spin_lock_bh(&ma->mca_lock);
1375                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1376                                 /* gsquery <- gsquery && mark */
1377                                 if (!mark)
1378                                         ma->mca_flags &= ~MAF_GSQUERY;
1379                         } else {
1380                                 /* gsquery <- mark */
1381                                 if (mark)
1382                                         ma->mca_flags |= MAF_GSQUERY;
1383                                 else
1384                                         ma->mca_flags &= ~MAF_GSQUERY;
1385                         }
1386                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1387                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1388                                 igmp6_group_queried(ma, max_delay);
1389                         spin_unlock_bh(&ma->mca_lock);
1390                         break;
1391                 }
1392         }
1393         read_unlock_bh(&idev->lock);
1394
1395         return 0;
1396 }
1397
1398 /* called with rcu_read_lock() */
1399 int igmp6_event_report(struct sk_buff *skb)
1400 {
1401         struct ifmcaddr6 *ma;
1402         struct inet6_dev *idev;
1403         struct mld_msg *mld;
1404         int addr_type;
1405
1406         /* Our own report looped back. Ignore it. */
1407         if (skb->pkt_type == PACKET_LOOPBACK)
1408                 return 0;
1409
1410         /* send our report if the MC router may not have heard this report */
1411         if (skb->pkt_type != PACKET_MULTICAST &&
1412             skb->pkt_type != PACKET_BROADCAST)
1413                 return 0;
1414
1415         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1416                 return -EINVAL;
1417
1418         mld = (struct mld_msg *)icmp6_hdr(skb);
1419
1420         /* Drop reports with not link local source */
1421         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1422         if (addr_type != IPV6_ADDR_ANY &&
1423             !(addr_type&IPV6_ADDR_LINKLOCAL))
1424                 return -EINVAL;
1425
1426         idev = __in6_dev_get(skb->dev);
1427         if (idev == NULL)
1428                 return -ENODEV;
1429
1430         /*
1431          *      Cancel the timer for this group
1432          */
1433
1434         read_lock_bh(&idev->lock);
1435         for (ma = idev->mc_list; ma; ma = ma->next) {
1436                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1437                         spin_lock(&ma->mca_lock);
1438                         if (del_timer(&ma->mca_timer))
1439                                 atomic_dec(&ma->mca_refcnt);
1440                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1441                         spin_unlock(&ma->mca_lock);
1442                         break;
1443                 }
1444         }
1445         read_unlock_bh(&idev->lock);
1446         return 0;
1447 }
1448
1449 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1450                   int gdeleted, int sdeleted)
1451 {
1452         switch (type) {
1453         case MLD2_MODE_IS_INCLUDE:
1454         case MLD2_MODE_IS_EXCLUDE:
1455                 if (gdeleted || sdeleted)
1456                         return false;
1457                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1458                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1459                                 return true;
1460                         /* don't include if this source is excluded
1461                          * in all filters
1462                          */
1463                         if (psf->sf_count[MCAST_INCLUDE])
1464                                 return type == MLD2_MODE_IS_INCLUDE;
1465                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1466                                 psf->sf_count[MCAST_EXCLUDE];
1467                 }
1468                 return false;
1469         case MLD2_CHANGE_TO_INCLUDE:
1470                 if (gdeleted || sdeleted)
1471                         return false;
1472                 return psf->sf_count[MCAST_INCLUDE] != 0;
1473         case MLD2_CHANGE_TO_EXCLUDE:
1474                 if (gdeleted || sdeleted)
1475                         return false;
1476                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1477                     psf->sf_count[MCAST_INCLUDE])
1478                         return false;
1479                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1480                         psf->sf_count[MCAST_EXCLUDE];
1481         case MLD2_ALLOW_NEW_SOURCES:
1482                 if (gdeleted || !psf->sf_crcount)
1483                         return false;
1484                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1485         case MLD2_BLOCK_OLD_SOURCES:
1486                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1487                         return gdeleted || (psf->sf_crcount && sdeleted);
1488                 return psf->sf_crcount && !gdeleted && !sdeleted;
1489         }
1490         return false;
1491 }
1492
1493 static int
1494 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1495 {
1496         struct ip6_sf_list *psf;
1497         int scount = 0;
1498
1499         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1500                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1501                         continue;
1502                 scount++;
1503         }
1504         return scount;
1505 }
1506
1507 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1508                        struct net_device *dev,
1509                        const struct in6_addr *saddr,
1510                        const struct in6_addr *daddr,
1511                        int proto, int len)
1512 {
1513         struct ipv6hdr *hdr;
1514
1515         skb->protocol = htons(ETH_P_IPV6);
1516         skb->dev = dev;
1517
1518         skb_reset_network_header(skb);
1519         skb_put(skb, sizeof(struct ipv6hdr));
1520         hdr = ipv6_hdr(skb);
1521
1522         ip6_flow_hdr(hdr, 0, 0);
1523
1524         hdr->payload_len = htons(len);
1525         hdr->nexthdr = proto;
1526         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1527
1528         hdr->saddr = *saddr;
1529         hdr->daddr = *daddr;
1530 }
1531
1532 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1533 {
1534         struct net_device *dev = idev->dev;
1535         struct net *net = dev_net(dev);
1536         struct sock *sk = net->ipv6.igmp_sk;
1537         struct sk_buff *skb;
1538         struct mld2_report *pmr;
1539         struct in6_addr addr_buf;
1540         const struct in6_addr *saddr;
1541         int hlen = LL_RESERVED_SPACE(dev);
1542         int tlen = dev->needed_tailroom;
1543         int err;
1544         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1545                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1546                      IPV6_TLV_PADN, 0 };
1547
1548         /* we assume size > sizeof(ra) here */
1549         size += hlen + tlen;
1550         /* limit our allocations to order-0 page */
1551         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1552         skb = sock_alloc_send_skb(sk, size, 1, &err);
1553
1554         if (!skb)
1555                 return NULL;
1556
1557         skb->priority = TC_PRIO_CONTROL;
1558         skb_reserve(skb, hlen);
1559
1560         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1561                 /* <draft-ietf-magma-mld-source-05.txt>:
1562                  * use unspecified address as the source address
1563                  * when a valid link-local address is not available.
1564                  */
1565                 saddr = &in6addr_any;
1566         } else
1567                 saddr = &addr_buf;
1568
1569         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1570
1571         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1572
1573         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1574         skb_put(skb, sizeof(*pmr));
1575         pmr = (struct mld2_report *)skb_transport_header(skb);
1576         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1577         pmr->mld2r_resv1 = 0;
1578         pmr->mld2r_cksum = 0;
1579         pmr->mld2r_resv2 = 0;
1580         pmr->mld2r_ngrec = 0;
1581         return skb;
1582 }
1583
1584 static void mld_sendpack(struct sk_buff *skb)
1585 {
1586         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1587         struct mld2_report *pmr =
1588                               (struct mld2_report *)skb_transport_header(skb);
1589         int payload_len, mldlen;
1590         struct inet6_dev *idev;
1591         struct net *net = dev_net(skb->dev);
1592         int err;
1593         struct flowi6 fl6;
1594         struct dst_entry *dst;
1595
1596         rcu_read_lock();
1597         idev = __in6_dev_get(skb->dev);
1598         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1599
1600         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1601                 sizeof(*pip6);
1602         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1603         pip6->payload_len = htons(payload_len);
1604
1605         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1606                                            IPPROTO_ICMPV6,
1607                                            csum_partial(skb_transport_header(skb),
1608                                                         mldlen, 0));
1609
1610         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1611                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1612                          skb->dev->ifindex);
1613         dst = icmp6_dst_alloc(skb->dev, &fl6);
1614
1615         err = 0;
1616         if (IS_ERR(dst)) {
1617                 err = PTR_ERR(dst);
1618                 dst = NULL;
1619         }
1620         skb_dst_set(skb, dst);
1621         if (err)
1622                 goto err_out;
1623
1624         payload_len = skb->len;
1625
1626         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1627                       dst_output);
1628 out:
1629         if (!err) {
1630                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1631                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1632                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1633         } else {
1634                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1635         }
1636
1637         rcu_read_unlock();
1638         return;
1639
1640 err_out:
1641         kfree_skb(skb);
1642         goto out;
1643 }
1644
1645 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1646 {
1647         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1648 }
1649
1650 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1651         int type, struct mld2_grec **ppgr)
1652 {
1653         struct net_device *dev = pmc->idev->dev;
1654         struct mld2_report *pmr;
1655         struct mld2_grec *pgr;
1656
1657         if (!skb)
1658                 skb = mld_newpack(pmc->idev, dev->mtu);
1659         if (!skb)
1660                 return NULL;
1661         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1662         pgr->grec_type = type;
1663         pgr->grec_auxwords = 0;
1664         pgr->grec_nsrcs = 0;
1665         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1666         pmr = (struct mld2_report *)skb_transport_header(skb);
1667         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1668         *ppgr = pgr;
1669         return skb;
1670 }
1671
1672 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1673         skb_tailroom(skb)) : 0)
1674
1675 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1676         int type, int gdeleted, int sdeleted, int crsend)
1677 {
1678         struct inet6_dev *idev = pmc->idev;
1679         struct net_device *dev = idev->dev;
1680         struct mld2_report *pmr;
1681         struct mld2_grec *pgr = NULL;
1682         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1683         int scount, stotal, first, isquery, truncate;
1684
1685         if (pmc->mca_flags & MAF_NOREPORT)
1686                 return skb;
1687
1688         isquery = type == MLD2_MODE_IS_INCLUDE ||
1689                   type == MLD2_MODE_IS_EXCLUDE;
1690         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1691                     type == MLD2_CHANGE_TO_EXCLUDE;
1692
1693         stotal = scount = 0;
1694
1695         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1696
1697         if (!*psf_list)
1698                 goto empty_source;
1699
1700         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1701
1702         /* EX and TO_EX get a fresh packet, if needed */
1703         if (truncate) {
1704                 if (pmr && pmr->mld2r_ngrec &&
1705                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1706                         if (skb)
1707                                 mld_sendpack(skb);
1708                         skb = mld_newpack(idev, dev->mtu);
1709                 }
1710         }
1711         first = 1;
1712         psf_prev = NULL;
1713         for (psf = *psf_list; psf; psf = psf_next) {
1714                 struct in6_addr *psrc;
1715
1716                 psf_next = psf->sf_next;
1717
1718                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1719                         psf_prev = psf;
1720                         continue;
1721                 }
1722
1723                 /* clear marks on query responses */
1724                 if (isquery)
1725                         psf->sf_gsresp = 0;
1726
1727                 if (AVAILABLE(skb) < sizeof(*psrc) +
1728                     first*sizeof(struct mld2_grec)) {
1729                         if (truncate && !first)
1730                                 break;   /* truncate these */
1731                         if (pgr)
1732                                 pgr->grec_nsrcs = htons(scount);
1733                         if (skb)
1734                                 mld_sendpack(skb);
1735                         skb = mld_newpack(idev, dev->mtu);
1736                         first = 1;
1737                         scount = 0;
1738                 }
1739                 if (first) {
1740                         skb = add_grhead(skb, pmc, type, &pgr);
1741                         first = 0;
1742                 }
1743                 if (!skb)
1744                         return NULL;
1745                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1746                 *psrc = psf->sf_addr;
1747                 scount++; stotal++;
1748                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1749                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1750                         psf->sf_crcount--;
1751                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1752                                 if (psf_prev)
1753                                         psf_prev->sf_next = psf->sf_next;
1754                                 else
1755                                         *psf_list = psf->sf_next;
1756                                 kfree(psf);
1757                                 continue;
1758                         }
1759                 }
1760                 psf_prev = psf;
1761         }
1762
1763 empty_source:
1764         if (!stotal) {
1765                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1766                     type == MLD2_BLOCK_OLD_SOURCES)
1767                         return skb;
1768                 if (pmc->mca_crcount || isquery || crsend) {
1769                         /* make sure we have room for group header */
1770                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1771                                 mld_sendpack(skb);
1772                                 skb = NULL; /* add_grhead will get a new one */
1773                         }
1774                         skb = add_grhead(skb, pmc, type, &pgr);
1775                 }
1776         }
1777         if (pgr)
1778                 pgr->grec_nsrcs = htons(scount);
1779
1780         if (isquery)
1781                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1782         return skb;
1783 }
1784
1785 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1786 {
1787         struct sk_buff *skb = NULL;
1788         int type;
1789
1790         read_lock_bh(&idev->lock);
1791         if (!pmc) {
1792                 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1793                         if (pmc->mca_flags & MAF_NOREPORT)
1794                                 continue;
1795                         spin_lock_bh(&pmc->mca_lock);
1796                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1797                                 type = MLD2_MODE_IS_EXCLUDE;
1798                         else
1799                                 type = MLD2_MODE_IS_INCLUDE;
1800                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1801                         spin_unlock_bh(&pmc->mca_lock);
1802                 }
1803         } else {
1804                 spin_lock_bh(&pmc->mca_lock);
1805                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1806                         type = MLD2_MODE_IS_EXCLUDE;
1807                 else
1808                         type = MLD2_MODE_IS_INCLUDE;
1809                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1810                 spin_unlock_bh(&pmc->mca_lock);
1811         }
1812         read_unlock_bh(&idev->lock);
1813         if (skb)
1814                 mld_sendpack(skb);
1815 }
1816
1817 /*
1818  * remove zero-count source records from a source filter list
1819  */
1820 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1821 {
1822         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1823
1824         psf_prev = NULL;
1825         for (psf = *ppsf; psf; psf = psf_next) {
1826                 psf_next = psf->sf_next;
1827                 if (psf->sf_crcount == 0) {
1828                         if (psf_prev)
1829                                 psf_prev->sf_next = psf->sf_next;
1830                         else
1831                                 *ppsf = psf->sf_next;
1832                         kfree(psf);
1833                 } else
1834                         psf_prev = psf;
1835         }
1836 }
1837
1838 static void mld_send_cr(struct inet6_dev *idev)
1839 {
1840         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1841         struct sk_buff *skb = NULL;
1842         int type, dtype;
1843
1844         read_lock_bh(&idev->lock);
1845         spin_lock(&idev->mc_lock);
1846
1847         /* deleted MCA's */
1848         pmc_prev = NULL;
1849         for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1850                 pmc_next = pmc->next;
1851                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1852                         type = MLD2_BLOCK_OLD_SOURCES;
1853                         dtype = MLD2_BLOCK_OLD_SOURCES;
1854                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1855                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1856                 }
1857                 if (pmc->mca_crcount) {
1858                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1859                                 type = MLD2_CHANGE_TO_INCLUDE;
1860                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1861                         }
1862                         pmc->mca_crcount--;
1863                         if (pmc->mca_crcount == 0) {
1864                                 mld_clear_zeros(&pmc->mca_tomb);
1865                                 mld_clear_zeros(&pmc->mca_sources);
1866                         }
1867                 }
1868                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1869                     !pmc->mca_sources) {
1870                         if (pmc_prev)
1871                                 pmc_prev->next = pmc_next;
1872                         else
1873                                 idev->mc_tomb = pmc_next;
1874                         in6_dev_put(pmc->idev);
1875                         kfree(pmc);
1876                 } else
1877                         pmc_prev = pmc;
1878         }
1879         spin_unlock(&idev->mc_lock);
1880
1881         /* change recs */
1882         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1883                 spin_lock_bh(&pmc->mca_lock);
1884                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1885                         type = MLD2_BLOCK_OLD_SOURCES;
1886                         dtype = MLD2_ALLOW_NEW_SOURCES;
1887                 } else {
1888                         type = MLD2_ALLOW_NEW_SOURCES;
1889                         dtype = MLD2_BLOCK_OLD_SOURCES;
1890                 }
1891                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1892                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1893
1894                 /* filter mode changes */
1895                 if (pmc->mca_crcount) {
1896                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1897                                 type = MLD2_CHANGE_TO_EXCLUDE;
1898                         else
1899                                 type = MLD2_CHANGE_TO_INCLUDE;
1900                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1901                         pmc->mca_crcount--;
1902                 }
1903                 spin_unlock_bh(&pmc->mca_lock);
1904         }
1905         read_unlock_bh(&idev->lock);
1906         if (!skb)
1907                 return;
1908         (void) mld_sendpack(skb);
1909 }
1910
1911 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1912 {
1913         struct net *net = dev_net(dev);
1914         struct sock *sk = net->ipv6.igmp_sk;
1915         struct inet6_dev *idev;
1916         struct sk_buff *skb;
1917         struct mld_msg *hdr;
1918         const struct in6_addr *snd_addr, *saddr;
1919         struct in6_addr addr_buf;
1920         int hlen = LL_RESERVED_SPACE(dev);
1921         int tlen = dev->needed_tailroom;
1922         int err, len, payload_len, full_len;
1923         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1924                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1925                      IPV6_TLV_PADN, 0 };
1926         struct flowi6 fl6;
1927         struct dst_entry *dst;
1928
1929         if (type == ICMPV6_MGM_REDUCTION)
1930                 snd_addr = &in6addr_linklocal_allrouters;
1931         else
1932                 snd_addr = addr;
1933
1934         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1935         payload_len = len + sizeof(ra);
1936         full_len = sizeof(struct ipv6hdr) + payload_len;
1937
1938         rcu_read_lock();
1939         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1940                       IPSTATS_MIB_OUT, full_len);
1941         rcu_read_unlock();
1942
1943         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1944
1945         if (skb == NULL) {
1946                 rcu_read_lock();
1947                 IP6_INC_STATS(net, __in6_dev_get(dev),
1948                               IPSTATS_MIB_OUTDISCARDS);
1949                 rcu_read_unlock();
1950                 return;
1951         }
1952         skb->priority = TC_PRIO_CONTROL;
1953         skb_reserve(skb, hlen);
1954
1955         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1956                 /* <draft-ietf-magma-mld-source-05.txt>:
1957                  * use unspecified address as the source address
1958                  * when a valid link-local address is not available.
1959                  */
1960                 saddr = &in6addr_any;
1961         } else
1962                 saddr = &addr_buf;
1963
1964         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1965
1966         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1967
1968         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1969         memset(hdr, 0, sizeof(struct mld_msg));
1970         hdr->mld_type = type;
1971         hdr->mld_mca = *addr;
1972
1973         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1974                                          IPPROTO_ICMPV6,
1975                                          csum_partial(hdr, len, 0));
1976
1977         rcu_read_lock();
1978         idev = __in6_dev_get(skb->dev);
1979
1980         icmpv6_flow_init(sk, &fl6, type,
1981                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1982                          skb->dev->ifindex);
1983         dst = icmp6_dst_alloc(skb->dev, &fl6);
1984         if (IS_ERR(dst)) {
1985                 err = PTR_ERR(dst);
1986                 goto err_out;
1987         }
1988
1989         skb_dst_set(skb, dst);
1990         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1991                       dst_output);
1992 out:
1993         if (!err) {
1994                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1995                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1996                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1997         } else
1998                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1999
2000         rcu_read_unlock();
2001         return;
2002
2003 err_out:
2004         kfree_skb(skb);
2005         goto out;
2006 }
2007
2008 static void mld_send_initial_cr(struct inet6_dev *idev)
2009 {
2010         struct sk_buff *skb;
2011         struct ifmcaddr6 *pmc;
2012         int type;
2013
2014         if (mld_in_v1_mode(idev))
2015                 return;
2016
2017         skb = NULL;
2018         read_lock_bh(&idev->lock);
2019         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2020                 spin_lock_bh(&pmc->mca_lock);
2021                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2022                         type = MLD2_CHANGE_TO_EXCLUDE;
2023                 else
2024                         type = MLD2_CHANGE_TO_INCLUDE;
2025                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2026                 spin_unlock_bh(&pmc->mca_lock);
2027         }
2028         read_unlock_bh(&idev->lock);
2029         if (skb)
2030                 mld_sendpack(skb);
2031 }
2032
2033 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2034 {
2035         idev->mc_dad_count = idev->mc_qrv;
2036         if (idev->mc_dad_count) {
2037                 mld_send_initial_cr(idev);
2038                 idev->mc_dad_count--;
2039                 if (idev->mc_dad_count)
2040                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2041         }
2042 }
2043
2044 static void mld_dad_timer_expire(unsigned long data)
2045 {
2046         struct inet6_dev *idev = (struct inet6_dev *)data;
2047
2048         mld_send_initial_cr(idev);
2049         if (idev->mc_dad_count) {
2050                 idev->mc_dad_count--;
2051                 if (idev->mc_dad_count)
2052                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2053         }
2054         in6_dev_put(idev);
2055 }
2056
2057 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2058         const struct in6_addr *psfsrc)
2059 {
2060         struct ip6_sf_list *psf, *psf_prev;
2061         int rv = 0;
2062
2063         psf_prev = NULL;
2064         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2065                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2066                         break;
2067                 psf_prev = psf;
2068         }
2069         if (!psf || psf->sf_count[sfmode] == 0) {
2070                 /* source filter not found, or count wrong =>  bug */
2071                 return -ESRCH;
2072         }
2073         psf->sf_count[sfmode]--;
2074         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2075                 struct inet6_dev *idev = pmc->idev;
2076
2077                 /* no more filters for this source */
2078                 if (psf_prev)
2079                         psf_prev->sf_next = psf->sf_next;
2080                 else
2081                         pmc->mca_sources = psf->sf_next;
2082                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2083                     !mld_in_v1_mode(idev)) {
2084                         psf->sf_crcount = idev->mc_qrv;
2085                         psf->sf_next = pmc->mca_tomb;
2086                         pmc->mca_tomb = psf;
2087                         rv = 1;
2088                 } else
2089                         kfree(psf);
2090         }
2091         return rv;
2092 }
2093
2094 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2095                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2096                           int delta)
2097 {
2098         struct ifmcaddr6 *pmc;
2099         int     changerec = 0;
2100         int     i, err;
2101
2102         if (!idev)
2103                 return -ENODEV;
2104         read_lock_bh(&idev->lock);
2105         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2106                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2107                         break;
2108         }
2109         if (!pmc) {
2110                 /* MCA not found?? bug */
2111                 read_unlock_bh(&idev->lock);
2112                 return -ESRCH;
2113         }
2114         spin_lock_bh(&pmc->mca_lock);
2115         sf_markstate(pmc);
2116         if (!delta) {
2117                 if (!pmc->mca_sfcount[sfmode]) {
2118                         spin_unlock_bh(&pmc->mca_lock);
2119                         read_unlock_bh(&idev->lock);
2120                         return -EINVAL;
2121                 }
2122                 pmc->mca_sfcount[sfmode]--;
2123         }
2124         err = 0;
2125         for (i = 0; i < sfcount; i++) {
2126                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2127
2128                 changerec |= rv > 0;
2129                 if (!err && rv < 0)
2130                         err = rv;
2131         }
2132         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2133             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2134             pmc->mca_sfcount[MCAST_INCLUDE]) {
2135                 struct ip6_sf_list *psf;
2136
2137                 /* filter mode change */
2138                 pmc->mca_sfmode = MCAST_INCLUDE;
2139                 pmc->mca_crcount = idev->mc_qrv;
2140                 idev->mc_ifc_count = pmc->mca_crcount;
2141                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2142                         psf->sf_crcount = 0;
2143                 mld_ifc_event(pmc->idev);
2144         } else if (sf_setstate(pmc) || changerec)
2145                 mld_ifc_event(pmc->idev);
2146         spin_unlock_bh(&pmc->mca_lock);
2147         read_unlock_bh(&idev->lock);
2148         return err;
2149 }
2150
2151 /*
2152  * Add multicast single-source filter to the interface list
2153  */
2154 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2155         const struct in6_addr *psfsrc)
2156 {
2157         struct ip6_sf_list *psf, *psf_prev;
2158
2159         psf_prev = NULL;
2160         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2161                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2162                         break;
2163                 psf_prev = psf;
2164         }
2165         if (!psf) {
2166                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2167                 if (!psf)
2168                         return -ENOBUFS;
2169
2170                 psf->sf_addr = *psfsrc;
2171                 if (psf_prev) {
2172                         psf_prev->sf_next = psf;
2173                 } else
2174                         pmc->mca_sources = psf;
2175         }
2176         psf->sf_count[sfmode]++;
2177         return 0;
2178 }
2179
2180 static void sf_markstate(struct ifmcaddr6 *pmc)
2181 {
2182         struct ip6_sf_list *psf;
2183         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2184
2185         for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2186                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2187                         psf->sf_oldin = mca_xcount ==
2188                                 psf->sf_count[MCAST_EXCLUDE] &&
2189                                 !psf->sf_count[MCAST_INCLUDE];
2190                 } else
2191                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2192 }
2193
2194 static int sf_setstate(struct ifmcaddr6 *pmc)
2195 {
2196         struct ip6_sf_list *psf, *dpsf;
2197         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2198         int qrv = pmc->idev->mc_qrv;
2199         int new_in, rv;
2200
2201         rv = 0;
2202         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2203                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2204                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2205                                 !psf->sf_count[MCAST_INCLUDE];
2206                 } else
2207                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2208                 if (new_in) {
2209                         if (!psf->sf_oldin) {
2210                                 struct ip6_sf_list *prev = NULL;
2211
2212                                 for (dpsf = pmc->mca_tomb; dpsf;
2213                                      dpsf = dpsf->sf_next) {
2214                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2215                                             &psf->sf_addr))
2216                                                 break;
2217                                         prev = dpsf;
2218                                 }
2219                                 if (dpsf) {
2220                                         if (prev)
2221                                                 prev->sf_next = dpsf->sf_next;
2222                                         else
2223                                                 pmc->mca_tomb = dpsf->sf_next;
2224                                         kfree(dpsf);
2225                                 }
2226                                 psf->sf_crcount = qrv;
2227                                 rv++;
2228                         }
2229                 } else if (psf->sf_oldin) {
2230                         psf->sf_crcount = 0;
2231                         /*
2232                          * add or update "delete" records if an active filter
2233                          * is now inactive
2234                          */
2235                         for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2236                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2237                                     &psf->sf_addr))
2238                                         break;
2239                         if (!dpsf) {
2240                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2241                                 if (!dpsf)
2242                                         continue;
2243                                 *dpsf = *psf;
2244                                 /* pmc->mca_lock held by callers */
2245                                 dpsf->sf_next = pmc->mca_tomb;
2246                                 pmc->mca_tomb = dpsf;
2247                         }
2248                         dpsf->sf_crcount = qrv;
2249                         rv++;
2250                 }
2251         }
2252         return rv;
2253 }
2254
2255 /*
2256  * Add multicast source filter list to the interface list
2257  */
2258 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2259                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2260                           int delta)
2261 {
2262         struct ifmcaddr6 *pmc;
2263         int     isexclude;
2264         int     i, err;
2265
2266         if (!idev)
2267                 return -ENODEV;
2268         read_lock_bh(&idev->lock);
2269         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2270                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2271                         break;
2272         }
2273         if (!pmc) {
2274                 /* MCA not found?? bug */
2275                 read_unlock_bh(&idev->lock);
2276                 return -ESRCH;
2277         }
2278         spin_lock_bh(&pmc->mca_lock);
2279
2280         sf_markstate(pmc);
2281         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2282         if (!delta)
2283                 pmc->mca_sfcount[sfmode]++;
2284         err = 0;
2285         for (i = 0; i < sfcount; i++) {
2286                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2287                 if (err)
2288                         break;
2289         }
2290         if (err) {
2291                 int j;
2292
2293                 if (!delta)
2294                         pmc->mca_sfcount[sfmode]--;
2295                 for (j = 0; j < i; j++)
2296                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2297         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2298                 struct ip6_sf_list *psf;
2299
2300                 /* filter mode change */
2301                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2302                         pmc->mca_sfmode = MCAST_EXCLUDE;
2303                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2304                         pmc->mca_sfmode = MCAST_INCLUDE;
2305                 /* else no filters; keep old mode for reports */
2306
2307                 pmc->mca_crcount = idev->mc_qrv;
2308                 idev->mc_ifc_count = pmc->mca_crcount;
2309                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2310                         psf->sf_crcount = 0;
2311                 mld_ifc_event(idev);
2312         } else if (sf_setstate(pmc))
2313                 mld_ifc_event(idev);
2314         spin_unlock_bh(&pmc->mca_lock);
2315         read_unlock_bh(&idev->lock);
2316         return err;
2317 }
2318
2319 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2320 {
2321         struct ip6_sf_list *psf, *nextpsf;
2322
2323         for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2324                 nextpsf = psf->sf_next;
2325                 kfree(psf);
2326         }
2327         pmc->mca_tomb = NULL;
2328         for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2329                 nextpsf = psf->sf_next;
2330                 kfree(psf);
2331         }
2332         pmc->mca_sources = NULL;
2333         pmc->mca_sfmode = MCAST_EXCLUDE;
2334         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2335         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2336 }
2337
2338
2339 static void igmp6_join_group(struct ifmcaddr6 *ma)
2340 {
2341         unsigned long delay;
2342
2343         if (ma->mca_flags & MAF_NOREPORT)
2344                 return;
2345
2346         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2347
2348         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2349
2350         spin_lock_bh(&ma->mca_lock);
2351         if (del_timer(&ma->mca_timer)) {
2352                 atomic_dec(&ma->mca_refcnt);
2353                 delay = ma->mca_timer.expires - jiffies;
2354         }
2355
2356         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2357                 atomic_inc(&ma->mca_refcnt);
2358         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2359         spin_unlock_bh(&ma->mca_lock);
2360 }
2361
2362 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2363                             struct inet6_dev *idev)
2364 {
2365         int err;
2366
2367         /* callers have the socket lock and rtnl lock
2368          * so no other readers or writers of iml or its sflist
2369          */
2370         if (!iml->sflist) {
2371                 /* any-source empty exclude case */
2372                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2373         }
2374         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2375                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2376         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2377         iml->sflist = NULL;
2378         return err;
2379 }
2380
2381 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2382 {
2383         if (mld_in_v1_mode(ma->idev)) {
2384                 if (ma->mca_flags & MAF_LAST_REPORTER)
2385                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2386                                 ICMPV6_MGM_REDUCTION);
2387         } else {
2388                 mld_add_delrec(ma->idev, ma);
2389                 mld_ifc_event(ma->idev);
2390         }
2391 }
2392
2393 static void mld_gq_timer_expire(unsigned long data)
2394 {
2395         struct inet6_dev *idev = (struct inet6_dev *)data;
2396
2397         idev->mc_gq_running = 0;
2398         mld_send_report(idev, NULL);
2399         in6_dev_put(idev);
2400 }
2401
2402 static void mld_ifc_timer_expire(unsigned long data)
2403 {
2404         struct inet6_dev *idev = (struct inet6_dev *)data;
2405
2406         mld_send_cr(idev);
2407         if (idev->mc_ifc_count) {
2408                 idev->mc_ifc_count--;
2409                 if (idev->mc_ifc_count)
2410                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2411         }
2412         in6_dev_put(idev);
2413 }
2414
2415 static void mld_ifc_event(struct inet6_dev *idev)
2416 {
2417         if (mld_in_v1_mode(idev))
2418                 return;
2419         idev->mc_ifc_count = idev->mc_qrv;
2420         mld_ifc_start_timer(idev, 1);
2421 }
2422
2423
2424 static void igmp6_timer_handler(unsigned long data)
2425 {
2426         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2427
2428         if (mld_in_v1_mode(ma->idev))
2429                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2430         else
2431                 mld_send_report(ma->idev, ma);
2432
2433         spin_lock(&ma->mca_lock);
2434         ma->mca_flags |=  MAF_LAST_REPORTER;
2435         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2436         spin_unlock(&ma->mca_lock);
2437         ma_put(ma);
2438 }
2439
2440 /* Device changing type */
2441
2442 void ipv6_mc_unmap(struct inet6_dev *idev)
2443 {
2444         struct ifmcaddr6 *i;
2445
2446         /* Install multicast list, except for all-nodes (already installed) */
2447
2448         read_lock_bh(&idev->lock);
2449         for (i = idev->mc_list; i; i = i->next)
2450                 igmp6_group_dropped(i);
2451         read_unlock_bh(&idev->lock);
2452 }
2453
2454 void ipv6_mc_remap(struct inet6_dev *idev)
2455 {
2456         ipv6_mc_up(idev);
2457 }
2458
2459 /* Device going down */
2460
2461 void ipv6_mc_down(struct inet6_dev *idev)
2462 {
2463         struct ifmcaddr6 *i;
2464
2465         /* Withdraw multicast list */
2466
2467         read_lock_bh(&idev->lock);
2468         mld_ifc_stop_timer(idev);
2469         mld_gq_stop_timer(idev);
2470         mld_dad_stop_timer(idev);
2471
2472         for (i = idev->mc_list; i; i = i->next)
2473                 igmp6_group_dropped(i);
2474         read_unlock_bh(&idev->lock);
2475
2476         mld_clear_delrec(idev);
2477 }
2478
2479 static void ipv6_mc_reset(struct inet6_dev *idev)
2480 {
2481         idev->mc_qrv = sysctl_mld_qrv;
2482         idev->mc_qi = MLD_QI_DEFAULT;
2483         idev->mc_qri = MLD_QRI_DEFAULT;
2484         idev->mc_v1_seen = 0;
2485         idev->mc_maxdelay = unsolicited_report_interval(idev);
2486 }
2487
2488 /* Device going up */
2489
2490 void ipv6_mc_up(struct inet6_dev *idev)
2491 {
2492         struct ifmcaddr6 *i;
2493
2494         /* Install multicast list, except for all-nodes (already installed) */
2495
2496         read_lock_bh(&idev->lock);
2497         ipv6_mc_reset(idev);
2498         for (i = idev->mc_list; i; i = i->next)
2499                 igmp6_group_added(i);
2500         read_unlock_bh(&idev->lock);
2501 }
2502
2503 /* IPv6 device initialization. */
2504
2505 void ipv6_mc_init_dev(struct inet6_dev *idev)
2506 {
2507         write_lock_bh(&idev->lock);
2508         spin_lock_init(&idev->mc_lock);
2509         idev->mc_gq_running = 0;
2510         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2511                         (unsigned long)idev);
2512         idev->mc_tomb = NULL;
2513         idev->mc_ifc_count = 0;
2514         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2515                         (unsigned long)idev);
2516         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2517                     (unsigned long)idev);
2518         ipv6_mc_reset(idev);
2519         write_unlock_bh(&idev->lock);
2520 }
2521
2522 /*
2523  *      Device is about to be destroyed: clean up.
2524  */
2525
2526 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2527 {
2528         struct ifmcaddr6 *i;
2529
2530         /* Deactivate timers */
2531         ipv6_mc_down(idev);
2532
2533         /* Delete all-nodes address. */
2534         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2535          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2536          * fail.
2537          */
2538         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2539
2540         if (idev->cnf.forwarding)
2541                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2542
2543         write_lock_bh(&idev->lock);
2544         while ((i = idev->mc_list) != NULL) {
2545                 idev->mc_list = i->next;
2546                 write_unlock_bh(&idev->lock);
2547
2548                 igmp6_group_dropped(i);
2549                 ma_put(i);
2550
2551                 write_lock_bh(&idev->lock);
2552         }
2553         write_unlock_bh(&idev->lock);
2554 }
2555
2556 #ifdef CONFIG_PROC_FS
2557 struct igmp6_mc_iter_state {
2558         struct seq_net_private p;
2559         struct net_device *dev;
2560         struct inet6_dev *idev;
2561 };
2562
2563 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2564
2565 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2566 {
2567         struct ifmcaddr6 *im = NULL;
2568         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2569         struct net *net = seq_file_net(seq);
2570
2571         state->idev = NULL;
2572         for_each_netdev_rcu(net, state->dev) {
2573                 struct inet6_dev *idev;
2574                 idev = __in6_dev_get(state->dev);
2575                 if (!idev)
2576                         continue;
2577                 read_lock_bh(&idev->lock);
2578                 im = idev->mc_list;
2579                 if (im) {
2580                         state->idev = idev;
2581                         break;
2582                 }
2583                 read_unlock_bh(&idev->lock);
2584         }
2585         return im;
2586 }
2587
2588 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2589 {
2590         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2591
2592         im = im->next;
2593         while (!im) {
2594                 if (likely(state->idev != NULL))
2595                         read_unlock_bh(&state->idev->lock);
2596
2597                 state->dev = next_net_device_rcu(state->dev);
2598                 if (!state->dev) {
2599                         state->idev = NULL;
2600                         break;
2601                 }
2602                 state->idev = __in6_dev_get(state->dev);
2603                 if (!state->idev)
2604                         continue;
2605                 read_lock_bh(&state->idev->lock);
2606                 im = state->idev->mc_list;
2607         }
2608         return im;
2609 }
2610
2611 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2612 {
2613         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2614         if (im)
2615                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2616                         --pos;
2617         return pos ? NULL : im;
2618 }
2619
2620 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2621         __acquires(RCU)
2622 {
2623         rcu_read_lock();
2624         return igmp6_mc_get_idx(seq, *pos);
2625 }
2626
2627 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2628 {
2629         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2630
2631         ++*pos;
2632         return im;
2633 }
2634
2635 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2636         __releases(RCU)
2637 {
2638         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2639
2640         if (likely(state->idev != NULL)) {
2641                 read_unlock_bh(&state->idev->lock);
2642                 state->idev = NULL;
2643         }
2644         state->dev = NULL;
2645         rcu_read_unlock();
2646 }
2647
2648 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2649 {
2650         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2651         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2652
2653         seq_printf(seq,
2654                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2655                    state->dev->ifindex, state->dev->name,
2656                    &im->mca_addr,
2657                    im->mca_users, im->mca_flags,
2658                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2659                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2660         return 0;
2661 }
2662
2663 static const struct seq_operations igmp6_mc_seq_ops = {
2664         .start  =       igmp6_mc_seq_start,
2665         .next   =       igmp6_mc_seq_next,
2666         .stop   =       igmp6_mc_seq_stop,
2667         .show   =       igmp6_mc_seq_show,
2668 };
2669
2670 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2671 {
2672         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2673                             sizeof(struct igmp6_mc_iter_state));
2674 }
2675
2676 static const struct file_operations igmp6_mc_seq_fops = {
2677         .owner          =       THIS_MODULE,
2678         .open           =       igmp6_mc_seq_open,
2679         .read           =       seq_read,
2680         .llseek         =       seq_lseek,
2681         .release        =       seq_release_net,
2682 };
2683
2684 struct igmp6_mcf_iter_state {
2685         struct seq_net_private p;
2686         struct net_device *dev;
2687         struct inet6_dev *idev;
2688         struct ifmcaddr6 *im;
2689 };
2690
2691 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2692
2693 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2694 {
2695         struct ip6_sf_list *psf = NULL;
2696         struct ifmcaddr6 *im = NULL;
2697         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2698         struct net *net = seq_file_net(seq);
2699
2700         state->idev = NULL;
2701         state->im = NULL;
2702         for_each_netdev_rcu(net, state->dev) {
2703                 struct inet6_dev *idev;
2704                 idev = __in6_dev_get(state->dev);
2705                 if (unlikely(idev == NULL))
2706                         continue;
2707                 read_lock_bh(&idev->lock);
2708                 im = idev->mc_list;
2709                 if (likely(im != NULL)) {
2710                         spin_lock_bh(&im->mca_lock);
2711                         psf = im->mca_sources;
2712                         if (likely(psf != NULL)) {
2713                                 state->im = im;
2714                                 state->idev = idev;
2715                                 break;
2716                         }
2717                         spin_unlock_bh(&im->mca_lock);
2718                 }
2719                 read_unlock_bh(&idev->lock);
2720         }
2721         return psf;
2722 }
2723
2724 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2725 {
2726         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2727
2728         psf = psf->sf_next;
2729         while (!psf) {
2730                 spin_unlock_bh(&state->im->mca_lock);
2731                 state->im = state->im->next;
2732                 while (!state->im) {
2733                         if (likely(state->idev != NULL))
2734                                 read_unlock_bh(&state->idev->lock);
2735
2736                         state->dev = next_net_device_rcu(state->dev);
2737                         if (!state->dev) {
2738                                 state->idev = NULL;
2739                                 goto out;
2740                         }
2741                         state->idev = __in6_dev_get(state->dev);
2742                         if (!state->idev)
2743                                 continue;
2744                         read_lock_bh(&state->idev->lock);
2745                         state->im = state->idev->mc_list;
2746                 }
2747                 if (!state->im)
2748                         break;
2749                 spin_lock_bh(&state->im->mca_lock);
2750                 psf = state->im->mca_sources;
2751         }
2752 out:
2753         return psf;
2754 }
2755
2756 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2757 {
2758         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2759         if (psf)
2760                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2761                         --pos;
2762         return pos ? NULL : psf;
2763 }
2764
2765 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2766         __acquires(RCU)
2767 {
2768         rcu_read_lock();
2769         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2770 }
2771
2772 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2773 {
2774         struct ip6_sf_list *psf;
2775         if (v == SEQ_START_TOKEN)
2776                 psf = igmp6_mcf_get_first(seq);
2777         else
2778                 psf = igmp6_mcf_get_next(seq, v);
2779         ++*pos;
2780         return psf;
2781 }
2782
2783 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2784         __releases(RCU)
2785 {
2786         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2787         if (likely(state->im != NULL)) {
2788                 spin_unlock_bh(&state->im->mca_lock);
2789                 state->im = NULL;
2790         }
2791         if (likely(state->idev != NULL)) {
2792                 read_unlock_bh(&state->idev->lock);
2793                 state->idev = NULL;
2794         }
2795         state->dev = NULL;
2796         rcu_read_unlock();
2797 }
2798
2799 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2800 {
2801         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2802         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2803
2804         if (v == SEQ_START_TOKEN) {
2805                 seq_printf(seq,
2806                            "%3s %6s "
2807                            "%32s %32s %6s %6s\n", "Idx",
2808                            "Device", "Multicast Address",
2809                            "Source Address", "INC", "EXC");
2810         } else {
2811                 seq_printf(seq,
2812                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2813                            state->dev->ifindex, state->dev->name,
2814                            &state->im->mca_addr,
2815                            &psf->sf_addr,
2816                            psf->sf_count[MCAST_INCLUDE],
2817                            psf->sf_count[MCAST_EXCLUDE]);
2818         }
2819         return 0;
2820 }
2821
2822 static const struct seq_operations igmp6_mcf_seq_ops = {
2823         .start  =       igmp6_mcf_seq_start,
2824         .next   =       igmp6_mcf_seq_next,
2825         .stop   =       igmp6_mcf_seq_stop,
2826         .show   =       igmp6_mcf_seq_show,
2827 };
2828
2829 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2830 {
2831         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2832                             sizeof(struct igmp6_mcf_iter_state));
2833 }
2834
2835 static const struct file_operations igmp6_mcf_seq_fops = {
2836         .owner          =       THIS_MODULE,
2837         .open           =       igmp6_mcf_seq_open,
2838         .read           =       seq_read,
2839         .llseek         =       seq_lseek,
2840         .release        =       seq_release_net,
2841 };
2842
2843 static int __net_init igmp6_proc_init(struct net *net)
2844 {
2845         int err;
2846
2847         err = -ENOMEM;
2848         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2849                 goto out;
2850         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2851                          &igmp6_mcf_seq_fops))
2852                 goto out_proc_net_igmp6;
2853
2854         err = 0;
2855 out:
2856         return err;
2857
2858 out_proc_net_igmp6:
2859         remove_proc_entry("igmp6", net->proc_net);
2860         goto out;
2861 }
2862
2863 static void __net_exit igmp6_proc_exit(struct net *net)
2864 {
2865         remove_proc_entry("mcfilter6", net->proc_net);
2866         remove_proc_entry("igmp6", net->proc_net);
2867 }
2868 #else
2869 static inline int igmp6_proc_init(struct net *net)
2870 {
2871         return 0;
2872 }
2873 static inline void igmp6_proc_exit(struct net *net)
2874 {
2875 }
2876 #endif
2877
2878 static int __net_init igmp6_net_init(struct net *net)
2879 {
2880         int err;
2881
2882         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2883                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2884         if (err < 0) {
2885                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2886                        err);
2887                 goto out;
2888         }
2889
2890         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2891
2892         err = igmp6_proc_init(net);
2893         if (err)
2894                 goto out_sock_create;
2895 out:
2896         return err;
2897
2898 out_sock_create:
2899         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2900         goto out;
2901 }
2902
2903 static void __net_exit igmp6_net_exit(struct net *net)
2904 {
2905         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2906         igmp6_proc_exit(net);
2907 }
2908
2909 static struct pernet_operations igmp6_net_ops = {
2910         .init = igmp6_net_init,
2911         .exit = igmp6_net_exit,
2912 };
2913
2914 int __init igmp6_init(void)
2915 {
2916         return register_pernet_subsys(&igmp6_net_ops);
2917 }
2918
2919 void igmp6_cleanup(void)
2920 {
2921         unregister_pernet_subsys(&igmp6_net_ops);
2922 }