net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <dlstevens@us.ibm.com>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/slab.h>
  47 #include <linux/pkt_sched.h>
  48 #include <net/mld.h>
  49
  50 #include <linux/netfilter.h>
  51 #include <linux/netfilter_ipv6.h>
  52
  53 #include <net/net_namespace.h>
  54 #include <net/sock.h>
  55 #include <net/snmp.h>
  56
  57 #include <net/ipv6.h>
  58 #include <net/protocol.h>
  59 #include <net/if_inet6.h>
  60 #include <net/ndisc.h>
  61 #include <net/addrconf.h>
  62 #include <net/ip6_route.h>
  63 #include <net/inet_common.h>
  64
  65 #include <net/ip6_checksum.h>
  66
  67 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  68 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  69         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  70         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  71         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  72 };
  73
  74 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  75
  76 static void igmp6_join_group(struct ifmcaddr6 *ma);
  77 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  78 static void igmp6_timer_handler(unsigned long data);
  79
  80 static void mld_gq_timer_expire(unsigned long data);
  81 static void mld_ifc_timer_expire(unsigned long data);
  82 static void mld_ifc_event(struct inet6_dev *idev);
  83 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  84 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  85 static void mld_clear_delrec(struct inet6_dev *idev);
  86 static bool mld_in_v1_mode(const struct inet6_dev *idev);
  87 static int sf_setstate(struct ifmcaddr6 *pmc);
  88 static void sf_markstate(struct ifmcaddr6 *pmc);
  89 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
  90 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  91                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
  92                           int delta);
  93 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  94                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
  95                           int delta);
  96 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
  97                             struct inet6_dev *idev);
  98
  99 #define MLD_QRV_DEFAULT         2
 100 /* RFC3810, 9.2. Query Interval */
 101 #define MLD_QI_DEFAULT          (125 * HZ)
 102 /* RFC3810, 9.3. Query Response Interval */
 103 #define MLD_QRI_DEFAULT         (10 * HZ)
 104
 105 /* RFC3810, 8.1 Query Version Distinctions */
 106 #define MLD_V1_QUERY_LEN        24
 107 #define MLD_V2_QUERY_LEN_MIN    28
 108
 109 #define IPV6_MLD_MAX_MSF        64
 110
 111 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 112 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
 113
 114 /*
 115  *      socket join on multicast group
 116  */
 117
 118 #define for_each_pmc_rcu(np, pmc)                               \
 119         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 120              pmc != NULL;                                       \
 121              pmc = rcu_dereference(pmc->next))
 122
 123 static int unsolicited_report_interval(struct inet6_dev *idev)
 124 {
 125         int iv;
 126
 127         if (mld_in_v1_mode(idev))
 128                 iv = idev->cnf.mldv1_unsolicited_report_interval;
 129         else
 130                 iv = idev->cnf.mldv2_unsolicited_report_interval;
 131
 132         return iv > 0 ? iv : 1;
 133 }
 134
 135 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 136 {
 137         struct net_device *dev = NULL;
 138         struct ipv6_mc_socklist *mc_lst;
 139         struct ipv6_pinfo *np = inet6_sk(sk);
 140         struct net *net = sock_net(sk);
 141         int err;
 142
 143         if (!ipv6_addr_is_multicast(addr))
 144                 return -EINVAL;
 145
 146         rcu_read_lock();
 147         for_each_pmc_rcu(np, mc_lst) {
 148                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 149                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 150                         rcu_read_unlock();
 151                         return -EADDRINUSE;
 152                 }
 153         }
 154         rcu_read_unlock();
 155
 156         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 157
 158         if (mc_lst == NULL)
 159                 return -ENOMEM;
 160
 161         mc_lst->next = NULL;
 162         mc_lst->addr = *addr;
 163
 164         rtnl_lock();
 165         if (ifindex == 0) {
 166                 struct rt6_info *rt;
 167                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 168                 if (rt) {
 169                         dev = rt->dst.dev;
 170                         ip6_rt_put(rt);
 171                 }
 172         } else
 173                 dev = __dev_get_by_index(net, ifindex);
 174
 175         if (dev == NULL) {
 176                 rtnl_unlock();
 177                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 178                 return -ENODEV;
 179         }
 180
 181         mc_lst->ifindex = dev->ifindex;
 182         mc_lst->sfmode = MCAST_EXCLUDE;
 183         rwlock_init(&mc_lst->sflock);
 184         mc_lst->sflist = NULL;
 185
 186         /*
 187          *      now add/increase the group membership on the device
 188          */
 189
 190         err = ipv6_dev_mc_inc(dev, addr);
 191
 192         if (err) {
 193                 rtnl_unlock();
 194                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 195                 return err;
 196         }
 197
 198         mc_lst->next = np->ipv6_mc_list;
 199         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 200
 201         rtnl_unlock();
 202
 203         return 0;
 204 }
 205
 206 /*
 207  *      socket leave on multicast group
 208  */
 209 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 210 {
 211         struct ipv6_pinfo *np = inet6_sk(sk);
 212         struct ipv6_mc_socklist *mc_lst;
 213         struct ipv6_mc_socklist __rcu **lnk;
 214         struct net *net = sock_net(sk);
 215
 216         if (!ipv6_addr_is_multicast(addr))
 217                 return -EINVAL;
 218
 219         rtnl_lock();
 220         for (lnk = &np->ipv6_mc_list;
 221              (mc_lst = rtnl_dereference(*lnk)) != NULL;
 222               lnk = &mc_lst->next) {
 223                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 224                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 225                         struct net_device *dev;
 226
 227                         *lnk = mc_lst->next;
 228
 229                         dev = __dev_get_by_index(net, mc_lst->ifindex);
 230                         if (dev != NULL) {
 231                                 struct inet6_dev *idev = __in6_dev_get(dev);
 232
 233                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 234                                 if (idev)
 235                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 236                         } else
 237                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 238                         rtnl_unlock();
 239
 240                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 241                         kfree_rcu(mc_lst, rcu);
 242                         return 0;
 243                 }
 244         }
 245         rtnl_unlock();
 246
 247         return -EADDRNOTAVAIL;
 248 }
 249
 250 /* called with rcu_read_lock() */
 251 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 252                                              const struct in6_addr *group,
 253                                              int ifindex)
 254 {
 255         struct net_device *dev = NULL;
 256         struct inet6_dev *idev = NULL;
 257
 258         if (ifindex == 0) {
 259                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 260
 261                 if (rt) {
 262                         dev = rt->dst.dev;
 263                         ip6_rt_put(rt);
 264                 }
 265         } else
 266                 dev = dev_get_by_index_rcu(net, ifindex);
 267
 268         if (!dev)
 269                 return NULL;
 270         idev = __in6_dev_get(dev);
 271         if (!idev)
 272                 return NULL;
 273         read_lock_bh(&idev->lock);
 274         if (idev->dead) {
 275                 read_unlock_bh(&idev->lock);
 276                 return NULL;
 277         }
 278         return idev;
 279 }
 280
 281 void ipv6_sock_mc_close(struct sock *sk)
 282 {
 283         struct ipv6_pinfo *np = inet6_sk(sk);
 284         struct ipv6_mc_socklist *mc_lst;
 285         struct net *net = sock_net(sk);
 286
 287         if (!rcu_access_pointer(np->ipv6_mc_list))
 288                 return;
 289
 290         rtnl_lock();
 291         while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
 292                 struct net_device *dev;
 293
 294                 np->ipv6_mc_list = mc_lst->next;
 295
 296                 dev = __dev_get_by_index(net, mc_lst->ifindex);
 297                 if (dev) {
 298                         struct inet6_dev *idev = __in6_dev_get(dev);
 299
 300                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 301                         if (idev)
 302                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 303                 } else
 304                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 305
 306                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 307                 kfree_rcu(mc_lst, rcu);
 308
 309         }
 310         rtnl_unlock();
 311 }
 312
 313 int ip6_mc_source(int add, int omode, struct sock *sk,
 314         struct group_source_req *pgsr)
 315 {
 316         struct in6_addr *source, *group;
 317         struct ipv6_mc_socklist *pmc;
 318         struct inet6_dev *idev;
 319         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 320         struct ip6_sf_socklist *psl;
 321         struct net *net = sock_net(sk);
 322         int i, j, rv;
 323         int leavegroup = 0;
 324         int pmclocked = 0;
 325         int err;
 326
 327         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 328         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 329
 330         if (!ipv6_addr_is_multicast(group))
 331                 return -EINVAL;
 332
 333         rcu_read_lock();
 334         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 335         if (!idev) {
 336                 rcu_read_unlock();
 337                 return -ENODEV;
 338         }
 339
 340         err = -EADDRNOTAVAIL;
 341
 342         for_each_pmc_rcu(inet6, pmc) {
 343                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 344                         continue;
 345                 if (ipv6_addr_equal(&pmc->addr, group))
 346                         break;
 347         }
 348         if (!pmc) {             /* must have a prior join */
 349                 err = -EINVAL;
 350                 goto done;
 351         }
 352         /* if a source filter was set, must be the same mode as before */
 353         if (pmc->sflist) {
 354                 if (pmc->sfmode != omode) {
 355                         err = -EINVAL;
 356                         goto done;
 357                 }
 358         } else if (pmc->sfmode != omode) {
 359                 /* allow mode switches for empty-set filters */
 360                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 361                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 362                 pmc->sfmode = omode;
 363         }
 364
 365         write_lock(&pmc->sflock);
 366         pmclocked = 1;
 367
 368         psl = pmc->sflist;
 369         if (!add) {
 370                 if (!psl)
 371                         goto done;      /* err = -EADDRNOTAVAIL */
 372                 rv = !0;
 373                 for (i = 0; i < psl->sl_count; i++) {
 374                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 375                         if (rv == 0)
 376                                 break;
 377                 }
 378                 if (rv)         /* source not found */
 379                         goto done;      /* err = -EADDRNOTAVAIL */
 380
 381                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 382                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 383                         leavegroup = 1;
 384                         goto done;
 385                 }
 386
 387                 /* update the interface filter */
 388                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 389
 390                 for (j = i+1; j < psl->sl_count; j++)
 391                         psl->sl_addr[j-1] = psl->sl_addr[j];
 392                 psl->sl_count--;
 393                 err = 0;
 394                 goto done;
 395         }
 396         /* else, add a new source to the filter */
 397
 398         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 399                 err = -ENOBUFS;
 400                 goto done;
 401         }
 402         if (!psl || psl->sl_count == psl->sl_max) {
 403                 struct ip6_sf_socklist *newpsl;
 404                 int count = IP6_SFBLOCK;
 405
 406                 if (psl)
 407                         count += psl->sl_max;
 408                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 409                 if (!newpsl) {
 410                         err = -ENOBUFS;
 411                         goto done;
 412                 }
 413                 newpsl->sl_max = count;
 414                 newpsl->sl_count = count - IP6_SFBLOCK;
 415                 if (psl) {
 416                         for (i = 0; i < psl->sl_count; i++)
 417                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 418                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 419                 }
 420                 pmc->sflist = psl = newpsl;
 421         }
 422         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 423         for (i = 0; i < psl->sl_count; i++) {
 424                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 425                 if (rv == 0) /* There is an error in the address. */
 426                         goto done;
 427         }
 428         for (j = psl->sl_count-1; j >= i; j--)
 429                 psl->sl_addr[j+1] = psl->sl_addr[j];
 430         psl->sl_addr[i] = *source;
 431         psl->sl_count++;
 432         err = 0;
 433         /* update the interface list */
 434         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 435 done:
 436         if (pmclocked)
 437                 write_unlock(&pmc->sflock);
 438         read_unlock_bh(&idev->lock);
 439         rcu_read_unlock();
 440         if (leavegroup)
 441                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 442         return err;
 443 }
 444
 445 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 446 {
 447         const struct in6_addr *group;
 448         struct ipv6_mc_socklist *pmc;
 449         struct inet6_dev *idev;
 450         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 451         struct ip6_sf_socklist *newpsl, *psl;
 452         struct net *net = sock_net(sk);
 453         int leavegroup = 0;
 454         int i, err;
 455
 456         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 457
 458         if (!ipv6_addr_is_multicast(group))
 459                 return -EINVAL;
 460         if (gsf->gf_fmode != MCAST_INCLUDE &&
 461             gsf->gf_fmode != MCAST_EXCLUDE)
 462                 return -EINVAL;
 463
 464         rcu_read_lock();
 465         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 466
 467         if (!idev) {
 468                 rcu_read_unlock();
 469                 return -ENODEV;
 470         }
 471
 472         err = 0;
 473
 474         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 475                 leavegroup = 1;
 476                 goto done;
 477         }
 478
 479         for_each_pmc_rcu(inet6, pmc) {
 480                 if (pmc->ifindex != gsf->gf_interface)
 481                         continue;
 482                 if (ipv6_addr_equal(&pmc->addr, group))
 483                         break;
 484         }
 485         if (!pmc) {             /* must have a prior join */
 486                 err = -EINVAL;
 487                 goto done;
 488         }
 489         if (gsf->gf_numsrc) {
 490                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 491                                                           GFP_ATOMIC);
 492                 if (!newpsl) {
 493                         err = -ENOBUFS;
 494                         goto done;
 495                 }
 496                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 497                 for (i = 0; i < newpsl->sl_count; ++i) {
 498                         struct sockaddr_in6 *psin6;
 499
 500                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 501                         newpsl->sl_addr[i] = psin6->sin6_addr;
 502                 }
 503                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 504                         newpsl->sl_count, newpsl->sl_addr, 0);
 505                 if (err) {
 506                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 507                         goto done;
 508                 }
 509         } else {
 510                 newpsl = NULL;
 511                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 512         }
 513
 514         write_lock(&pmc->sflock);
 515         psl = pmc->sflist;
 516         if (psl) {
 517                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 518                         psl->sl_count, psl->sl_addr, 0);
 519                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 520         } else
 521                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 522         pmc->sflist = newpsl;
 523         pmc->sfmode = gsf->gf_fmode;
 524         write_unlock(&pmc->sflock);
 525         err = 0;
 526 done:
 527         read_unlock_bh(&idev->lock);
 528         rcu_read_unlock();
 529         if (leavegroup)
 530                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 531         return err;
 532 }
 533
 534 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 535         struct group_filter __user *optval, int __user *optlen)
 536 {
 537         int err, i, count, copycount;
 538         const struct in6_addr *group;
 539         struct ipv6_mc_socklist *pmc;
 540         struct inet6_dev *idev;
 541         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 542         struct ip6_sf_socklist *psl;
 543         struct net *net = sock_net(sk);
 544
 545         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 546
 547         if (!ipv6_addr_is_multicast(group))
 548                 return -EINVAL;
 549
 550         rcu_read_lock();
 551         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 552
 553         if (!idev) {
 554                 rcu_read_unlock();
 555                 return -ENODEV;
 556         }
 557
 558         err = -EADDRNOTAVAIL;
 559         /* changes to the ipv6_mc_list require the socket lock and
 560          * rtnl lock. We have the socket lock and rcu read lock,
 561          * so reading the list is safe.
 562          */
 563
 564         for_each_pmc_rcu(inet6, pmc) {
 565                 if (pmc->ifindex != gsf->gf_interface)
 566                         continue;
 567                 if (ipv6_addr_equal(group, &pmc->addr))
 568                         break;
 569         }
 570         if (!pmc)               /* must have a prior join */
 571                 goto done;
 572         gsf->gf_fmode = pmc->sfmode;
 573         psl = pmc->sflist;
 574         count = psl ? psl->sl_count : 0;
 575         read_unlock_bh(&idev->lock);
 576         rcu_read_unlock();
 577
 578         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 579         gsf->gf_numsrc = count;
 580         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 581             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 582                 return -EFAULT;
 583         }
 584         /* changes to psl require the socket lock, and a write lock
 585          * on pmc->sflock. We have the socket lock so reading here is safe.
 586          */
 587         for (i = 0; i < copycount; i++) {
 588                 struct sockaddr_in6 *psin6;
 589                 struct sockaddr_storage ss;
 590
 591                 psin6 = (struct sockaddr_in6 *)&ss;
 592                 memset(&ss, 0, sizeof(ss));
 593                 psin6->sin6_family = AF_INET6;
 594                 psin6->sin6_addr = psl->sl_addr[i];
 595                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 596                         return -EFAULT;
 597         }
 598         return 0;
 599 done:
 600         read_unlock_bh(&idev->lock);
 601         rcu_read_unlock();
 602         return err;
 603 }
 604
 605 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 606                     const struct in6_addr *src_addr)
 607 {
 608         struct ipv6_pinfo *np = inet6_sk(sk);
 609         struct ipv6_mc_socklist *mc;
 610         struct ip6_sf_socklist *psl;
 611         bool rv = true;
 612
 613         rcu_read_lock();
 614         for_each_pmc_rcu(np, mc) {
 615                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 616                         break;
 617         }
 618         if (!mc) {
 619                 rcu_read_unlock();
 620                 return true;
 621         }
 622         read_lock(&mc->sflock);
 623         psl = mc->sflist;
 624         if (!psl) {
 625                 rv = mc->sfmode == MCAST_EXCLUDE;
 626         } else {
 627                 int i;
 628
 629                 for (i = 0; i < psl->sl_count; i++) {
 630                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 631                                 break;
 632                 }
 633                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 634                         rv = false;
 635                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 636                         rv = false;
 637         }
 638         read_unlock(&mc->sflock);
 639         rcu_read_unlock();
 640
 641         return rv;
 642 }
 643
 644 static void igmp6_group_added(struct ifmcaddr6 *mc)
 645 {
 646         struct net_device *dev = mc->idev->dev;
 647         char buf[MAX_ADDR_LEN];
 648
 649         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 650             IPV6_ADDR_SCOPE_LINKLOCAL)
 651                 return;
 652
 653         spin_lock_bh(&mc->mca_lock);
 654         if (!(mc->mca_flags&MAF_LOADED)) {
 655                 mc->mca_flags |= MAF_LOADED;
 656                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 657                         dev_mc_add(dev, buf);
 658         }
 659         spin_unlock_bh(&mc->mca_lock);
 660
 661         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 662                 return;
 663
 664         if (mld_in_v1_mode(mc->idev)) {
 665                 igmp6_join_group(mc);
 666                 return;
 667         }
 668         /* else v2 */
 669
 670         mc->mca_crcount = mc->idev->mc_qrv;
 671         mld_ifc_event(mc->idev);
 672 }
 673
 674 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 675 {
 676         struct net_device *dev = mc->idev->dev;
 677         char buf[MAX_ADDR_LEN];
 678
 679         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 680             IPV6_ADDR_SCOPE_LINKLOCAL)
 681                 return;
 682
 683         spin_lock_bh(&mc->mca_lock);
 684         if (mc->mca_flags&MAF_LOADED) {
 685                 mc->mca_flags &= ~MAF_LOADED;
 686                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 687                         dev_mc_del(dev, buf);
 688         }
 689
 690         if (mc->mca_flags & MAF_NOREPORT)
 691                 goto done;
 692         spin_unlock_bh(&mc->mca_lock);
 693
 694         if (!mc->idev->dead)
 695                 igmp6_leave_group(mc);
 696
 697         spin_lock_bh(&mc->mca_lock);
 698         if (del_timer(&mc->mca_timer))
 699                 atomic_dec(&mc->mca_refcnt);
 700 done:
 701         ip6_mc_clear_src(mc);
 702         spin_unlock_bh(&mc->mca_lock);
 703 }
 704
 705 /*
 706  * deleted ifmcaddr6 manipulation
 707  */
 708 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 709 {
 710         struct ifmcaddr6 *pmc;
 711
 712         /* this is an "ifmcaddr6" for convenience; only the fields below
 713          * are actually used. In particular, the refcnt and users are not
 714          * used for management of the delete list. Using the same structure
 715          * for deleted items allows change reports to use common code with
 716          * non-deleted or query-response MCA's.
 717          */
 718         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 719         if (!pmc)
 720                 return;
 721
 722         spin_lock_bh(&im->mca_lock);
 723         spin_lock_init(&pmc->mca_lock);
 724         pmc->idev = im->idev;
 725         in6_dev_hold(idev);
 726         pmc->mca_addr = im->mca_addr;
 727         pmc->mca_crcount = idev->mc_qrv;
 728         pmc->mca_sfmode = im->mca_sfmode;
 729         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 730                 struct ip6_sf_list *psf;
 731
 732                 pmc->mca_tomb = im->mca_tomb;
 733                 pmc->mca_sources = im->mca_sources;
 734                 im->mca_tomb = im->mca_sources = NULL;
 735                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
 736                         psf->sf_crcount = pmc->mca_crcount;
 737         }
 738         spin_unlock_bh(&im->mca_lock);
 739
 740         spin_lock_bh(&idev->mc_lock);
 741         pmc->next = idev->mc_tomb;
 742         idev->mc_tomb = pmc;
 743         spin_unlock_bh(&idev->mc_lock);
 744 }
 745
 746 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 747 {
 748         struct ifmcaddr6 *pmc, *pmc_prev;
 749         struct ip6_sf_list *psf, *psf_next;
 750
 751         spin_lock_bh(&idev->mc_lock);
 752         pmc_prev = NULL;
 753         for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
 754                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 755                         break;
 756                 pmc_prev = pmc;
 757         }
 758         if (pmc) {
 759                 if (pmc_prev)
 760                         pmc_prev->next = pmc->next;
 761                 else
 762                         idev->mc_tomb = pmc->next;
 763         }
 764         spin_unlock_bh(&idev->mc_lock);
 765
 766         if (pmc) {
 767                 for (psf = pmc->mca_tomb; psf; psf = psf_next) {
 768                         psf_next = psf->sf_next;
 769                         kfree(psf);
 770                 }
 771                 in6_dev_put(pmc->idev);
 772                 kfree(pmc);
 773         }
 774 }
 775
 776 static void mld_clear_delrec(struct inet6_dev *idev)
 777 {
 778         struct ifmcaddr6 *pmc, *nextpmc;
 779
 780         spin_lock_bh(&idev->mc_lock);
 781         pmc = idev->mc_tomb;
 782         idev->mc_tomb = NULL;
 783         spin_unlock_bh(&idev->mc_lock);
 784
 785         for (; pmc; pmc = nextpmc) {
 786                 nextpmc = pmc->next;
 787                 ip6_mc_clear_src(pmc);
 788                 in6_dev_put(pmc->idev);
 789                 kfree(pmc);
 790         }
 791
 792         /* clear dead sources, too */
 793         read_lock_bh(&idev->lock);
 794         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
 795                 struct ip6_sf_list *psf, *psf_next;
 796
 797                 spin_lock_bh(&pmc->mca_lock);
 798                 psf = pmc->mca_tomb;
 799                 pmc->mca_tomb = NULL;
 800                 spin_unlock_bh(&pmc->mca_lock);
 801                 for (; psf; psf = psf_next) {
 802                         psf_next = psf->sf_next;
 803                         kfree(psf);
 804                 }
 805         }
 806         read_unlock_bh(&idev->lock);
 807 }
 808
 809 static void mca_get(struct ifmcaddr6 *mc)
 810 {
 811         atomic_inc(&mc->mca_refcnt);
 812 }
 813
 814 static void ma_put(struct ifmcaddr6 *mc)
 815 {
 816         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 817                 in6_dev_put(mc->idev);
 818                 kfree(mc);
 819         }
 820 }
 821
 822 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
 823                                    const struct in6_addr *addr)
 824 {
 825         struct ifmcaddr6 *mc;
 826
 827         mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
 828         if (mc == NULL)
 829                 return NULL;
 830
 831         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 832
 833         mc->mca_addr = *addr;
 834         mc->idev = idev; /* reference taken by caller */
 835         mc->mca_users = 1;
 836         /* mca_stamp should be updated upon changes */
 837         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 838         atomic_set(&mc->mca_refcnt, 1);
 839         spin_lock_init(&mc->mca_lock);
 840
 841         /* initial mode is (EX, empty) */
 842         mc->mca_sfmode = MCAST_EXCLUDE;
 843         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 844
 845         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 846             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 847                 mc->mca_flags |= MAF_NOREPORT;
 848
 849         return mc;
 850 }
 851
 852 /*
 853  *      device multicast group inc (add if not found)
 854  */
 855 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 856 {
 857         struct ifmcaddr6 *mc;
 858         struct inet6_dev *idev;
 859
 860         ASSERT_RTNL();
 861
 862         /* we need to take a reference on idev */
 863         idev = in6_dev_get(dev);
 864
 865         if (idev == NULL)
 866                 return -EINVAL;
 867
 868         write_lock_bh(&idev->lock);
 869         if (idev->dead) {
 870                 write_unlock_bh(&idev->lock);
 871                 in6_dev_put(idev);
 872                 return -ENODEV;
 873         }
 874
 875         for (mc = idev->mc_list; mc; mc = mc->next) {
 876                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 877                         mc->mca_users++;
 878                         write_unlock_bh(&idev->lock);
 879                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 880                                 NULL, 0);
 881                         in6_dev_put(idev);
 882                         return 0;
 883                 }
 884         }
 885
 886         mc = mca_alloc(idev, addr);
 887         if (!mc) {
 888                 write_unlock_bh(&idev->lock);
 889                 in6_dev_put(idev);
 890                 return -ENOMEM;
 891         }
 892
 893         mc->next = idev->mc_list;
 894         idev->mc_list = mc;
 895
 896         /* Hold this for the code below before we unlock,
 897          * it is already exposed via idev->mc_list.
 898          */
 899         mca_get(mc);
 900         write_unlock_bh(&idev->lock);
 901
 902         mld_del_delrec(idev, &mc->mca_addr);
 903         igmp6_group_added(mc);
 904         ma_put(mc);
 905         return 0;
 906 }
 907
 908 /*
 909  *      device multicast group del
 910  */
 911 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 912 {
 913         struct ifmcaddr6 *ma, **map;
 914
 915         ASSERT_RTNL();
 916
 917         write_lock_bh(&idev->lock);
 918         for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
 919                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 920                         if (--ma->mca_users == 0) {
 921                                 *map = ma->next;
 922                                 write_unlock_bh(&idev->lock);
 923
 924                                 igmp6_group_dropped(ma);
 925
 926                                 ma_put(ma);
 927                                 return 0;
 928                         }
 929                         write_unlock_bh(&idev->lock);
 930                         return 0;
 931                 }
 932         }
 933         write_unlock_bh(&idev->lock);
 934
 935         return -ENOENT;
 936 }
 937
 938 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 939 {
 940         struct inet6_dev *idev;
 941         int err;
 942
 943         ASSERT_RTNL();
 944
 945         idev = __in6_dev_get(dev);
 946         if (!idev)
 947                 err = -ENODEV;
 948         else
 949                 err = __ipv6_dev_mc_dec(idev, addr);
 950
 951         return err;
 952 }
 953
 954 /*
 955  *      check if the interface/address pair is valid
 956  */
 957 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 958                          const struct in6_addr *src_addr)
 959 {
 960         struct inet6_dev *idev;
 961         struct ifmcaddr6 *mc;
 962         bool rv = false;
 963
 964         rcu_read_lock();
 965         idev = __in6_dev_get(dev);
 966         if (idev) {
 967                 read_lock_bh(&idev->lock);
 968                 for (mc = idev->mc_list; mc; mc = mc->next) {
 969                         if (ipv6_addr_equal(&mc->mca_addr, group))
 970                                 break;
 971                 }
 972                 if (mc) {
 973                         if (src_addr && !ipv6_addr_any(src_addr)) {
 974                                 struct ip6_sf_list *psf;
 975
 976                                 spin_lock_bh(&mc->mca_lock);
 977                                 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
 978                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 979                                                 break;
 980                                 }
 981                                 if (psf)
 982                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 983                                                 psf->sf_count[MCAST_EXCLUDE] !=
 984                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 985                                 else
 986                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
 987                                 spin_unlock_bh(&mc->mca_lock);
 988                         } else
 989                                 rv = true; /* don't filter unspecified source */
 990                 }
 991                 read_unlock_bh(&idev->lock);
 992         }
 993         rcu_read_unlock();
 994         return rv;
 995 }
 996
 997 static void mld_gq_start_timer(struct inet6_dev *idev)
 998 {
 999         unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1000
1001         idev->mc_gq_running = 1;
1002         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1003                 in6_dev_hold(idev);
1004 }
1005
1006 static void mld_gq_stop_timer(struct inet6_dev *idev)
1007 {
1008         idev->mc_gq_running = 0;
1009         if (del_timer(&idev->mc_gq_timer))
1010                 __in6_dev_put(idev);
1011 }
1012
1013 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1014 {
1015         unsigned long tv = prandom_u32() % delay;
1016
1017         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1018                 in6_dev_hold(idev);
1019 }
1020
1021 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1022 {
1023         idev->mc_ifc_count = 0;
1024         if (del_timer(&idev->mc_ifc_timer))
1025                 __in6_dev_put(idev);
1026 }
1027
1028 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1029 {
1030         unsigned long tv = prandom_u32() % delay;
1031
1032         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1033                 in6_dev_hold(idev);
1034 }
1035
1036 static void mld_dad_stop_timer(struct inet6_dev *idev)
1037 {
1038         if (del_timer(&idev->mc_dad_timer))
1039                 __in6_dev_put(idev);
1040 }
1041
1042 /*
1043  *      IGMP handling (alias multicast ICMPv6 messages)
1044  */
1045
1046 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1047 {
1048         unsigned long delay = resptime;
1049
1050         /* Do not start timer for these addresses */
1051         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1052             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1053                 return;
1054
1055         if (del_timer(&ma->mca_timer)) {
1056                 atomic_dec(&ma->mca_refcnt);
1057                 delay = ma->mca_timer.expires - jiffies;
1058         }
1059
1060         if (delay >= resptime)
1061                 delay = prandom_u32() % resptime;
1062
1063         ma->mca_timer.expires = jiffies + delay;
1064         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1065                 atomic_inc(&ma->mca_refcnt);
1066         ma->mca_flags |= MAF_TIMER_RUNNING;
1067 }
1068
1069 /* mark EXCLUDE-mode sources */
1070 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1071                              const struct in6_addr *srcs)
1072 {
1073         struct ip6_sf_list *psf;
1074         int i, scount;
1075
1076         scount = 0;
1077         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1078                 if (scount == nsrcs)
1079                         break;
1080                 for (i = 0; i < nsrcs; i++) {
1081                         /* skip inactive filters */
1082                         if (psf->sf_count[MCAST_INCLUDE] ||
1083                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1084                             psf->sf_count[MCAST_EXCLUDE])
1085                                 break;
1086                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1087                                 scount++;
1088                                 break;
1089                         }
1090                 }
1091         }
1092         pmc->mca_flags &= ~MAF_GSQUERY;
1093         if (scount == nsrcs)    /* all sources excluded */
1094                 return false;
1095         return true;
1096 }
1097
1098 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1099                             const struct in6_addr *srcs)
1100 {
1101         struct ip6_sf_list *psf;
1102         int i, scount;
1103
1104         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1105                 return mld_xmarksources(pmc, nsrcs, srcs);
1106
1107         /* mark INCLUDE-mode sources */
1108
1109         scount = 0;
1110         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1111                 if (scount == nsrcs)
1112                         break;
1113                 for (i = 0; i < nsrcs; i++) {
1114                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1115                                 psf->sf_gsresp = 1;
1116                                 scount++;
1117                                 break;
1118                         }
1119                 }
1120         }
1121         if (!scount) {
1122                 pmc->mca_flags &= ~MAF_GSQUERY;
1123                 return false;
1124         }
1125         pmc->mca_flags |= MAF_GSQUERY;
1126         return true;
1127 }
1128
1129 static int mld_force_mld_version(const struct inet6_dev *idev)
1130 {
1131         /* Normally, both are 0 here. If enforcement to a particular is
1132          * being used, individual device enforcement will have a lower
1133          * precedence over 'all' device (.../conf/all/force_mld_version).
1134          */
1135
1136         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1137                 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1138         else
1139                 return idev->cnf.force_mld_version;
1140 }
1141
1142 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1143 {
1144         return mld_force_mld_version(idev) == 2;
1145 }
1146
1147 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1148 {
1149         return mld_force_mld_version(idev) == 1;
1150 }
1151
1152 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1153 {
1154         if (mld_in_v2_mode_only(idev))
1155                 return false;
1156         if (mld_in_v1_mode_only(idev))
1157                 return true;
1158         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1159                 return true;
1160
1161         return false;
1162 }
1163
1164 static void mld_set_v1_mode(struct inet6_dev *idev)
1165 {
1166         /* RFC3810, relevant sections:
1167          *  - 9.1. Robustness Variable
1168          *  - 9.2. Query Interval
1169          *  - 9.3. Query Response Interval
1170          *  - 9.12. Older Version Querier Present Timeout
1171          */
1172         unsigned long switchback;
1173
1174         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1175
1176         idev->mc_v1_seen = jiffies + switchback;
1177 }
1178
1179 static void mld_update_qrv(struct inet6_dev *idev,
1180                            const struct mld2_query *mlh2)
1181 {
1182         /* RFC3810, relevant sections:
1183          *  - 5.1.8. QRV (Querier's Robustness Variable)
1184          *  - 9.1. Robustness Variable
1185          */
1186
1187         /* The value of the Robustness Variable MUST NOT be zero,
1188          * and SHOULD NOT be one. Catch this here if we ever run
1189          * into such a case in future.
1190          */
1191         const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1192         WARN_ON(idev->mc_qrv == 0);
1193
1194         if (mlh2->mld2q_qrv > 0)
1195                 idev->mc_qrv = mlh2->mld2q_qrv;
1196
1197         if (unlikely(idev->mc_qrv < min_qrv)) {
1198                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1199                                      idev->mc_qrv, min_qrv);
1200                 idev->mc_qrv = min_qrv;
1201         }
1202 }
1203
1204 static void mld_update_qi(struct inet6_dev *idev,
1205                           const struct mld2_query *mlh2)
1206 {
1207         /* RFC3810, relevant sections:
1208          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1209          *  - 9.2. Query Interval
1210          *  - 9.12. Older Version Querier Present Timeout
1211          *    (the [Query Interval] in the last Query received)
1212          */
1213         unsigned long mc_qqi;
1214
1215         if (mlh2->mld2q_qqic < 128) {
1216                 mc_qqi = mlh2->mld2q_qqic;
1217         } else {
1218                 unsigned long mc_man, mc_exp;
1219
1220                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1221                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1222
1223                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1224         }
1225
1226         idev->mc_qi = mc_qqi * HZ;
1227 }
1228
1229 static void mld_update_qri(struct inet6_dev *idev,
1230                            const struct mld2_query *mlh2)
1231 {
1232         /* RFC3810, relevant sections:
1233          *  - 5.1.3. Maximum Response Code
1234          *  - 9.3. Query Response Interval
1235          */
1236         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1237 }
1238
1239 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1240                           unsigned long *max_delay, bool v1_query)
1241 {
1242         unsigned long mldv1_md;
1243
1244         /* Ignore v1 queries */
1245         if (mld_in_v2_mode_only(idev))
1246                 return -EINVAL;
1247
1248         mldv1_md = ntohs(mld->mld_maxdelay);
1249
1250         /* When in MLDv1 fallback and a MLDv2 router start-up being
1251          * unaware of current MLDv1 operation, the MRC == MRD mapping
1252          * only works when the exponential algorithm is not being
1253          * used (as MLDv1 is unaware of such things).
1254          *
1255          * According to the RFC author, the MLDv2 implementations
1256          * he's aware of all use a MRC < 32768 on start up queries.
1257          *
1258          * Thus, should we *ever* encounter something else larger
1259          * than that, just assume the maximum possible within our
1260          * reach.
1261          */
1262         if (!v1_query)
1263                 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1264
1265         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1266
1267         /* MLDv1 router present: we need to go into v1 mode *only*
1268          * when an MLDv1 query is received as per section 9.12. of
1269          * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1270          * queries MUST be of exactly 24 octets.
1271          */
1272         if (v1_query)
1273                 mld_set_v1_mode(idev);
1274
1275         /* cancel MLDv2 report timer */
1276         mld_gq_stop_timer(idev);
1277         /* cancel the interface change timer */
1278         mld_ifc_stop_timer(idev);
1279         /* clear deleted report items */
1280         mld_clear_delrec(idev);
1281
1282         return 0;
1283 }
1284
1285 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1286                           unsigned long *max_delay)
1287 {
1288         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1289
1290         mld_update_qrv(idev, mld);
1291         mld_update_qi(idev, mld);
1292         mld_update_qri(idev, mld);
1293
1294         idev->mc_maxdelay = *max_delay;
1295
1296         return 0;
1297 }
1298
1299 /* called with rcu_read_lock() */
1300 int igmp6_event_query(struct sk_buff *skb)
1301 {
1302         struct mld2_query *mlh2 = NULL;
1303         struct ifmcaddr6 *ma;
1304         const struct in6_addr *group;
1305         unsigned long max_delay;
1306         struct inet6_dev *idev;
1307         struct mld_msg *mld;
1308         int group_type;
1309         int mark = 0;
1310         int len, err;
1311
1312         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1313                 return -EINVAL;
1314
1315         /* compute payload length excluding extension headers */
1316         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1317         len -= skb_network_header_len(skb);
1318
1319         /* RFC3810 6.2
1320          * Upon reception of an MLD message that contains a Query, the node
1321          * checks if the source address of the message is a valid link-local
1322          * address, if the Hop Limit is set to 1, and if the Router Alert
1323          * option is present in the Hop-By-Hop Options header of the IPv6
1324          * packet.  If any of these checks fails, the packet is dropped.
1325          */
1326         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1327             ipv6_hdr(skb)->hop_limit != 1 ||
1328             !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1329             IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1330                 return -EINVAL;
1331
1332         idev = __in6_dev_get(skb->dev);
1333         if (idev == NULL)
1334                 return 0;
1335
1336         mld = (struct mld_msg *)icmp6_hdr(skb);
1337         group = &mld->mld_mca;
1338         group_type = ipv6_addr_type(group);
1339
1340         if (group_type != IPV6_ADDR_ANY &&
1341             !(group_type&IPV6_ADDR_MULTICAST))
1342                 return -EINVAL;
1343
1344         if (len < MLD_V1_QUERY_LEN) {
1345                 return -EINVAL;
1346         } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1347                 err = mld_process_v1(idev, mld, &max_delay,
1348                                      len == MLD_V1_QUERY_LEN);
1349                 if (err < 0)
1350                         return err;
1351         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1352                 int srcs_offset = sizeof(struct mld2_query) -
1353                                   sizeof(struct icmp6hdr);
1354
1355                 if (!pskb_may_pull(skb, srcs_offset))
1356                         return -EINVAL;
1357
1358                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1359
1360                 err = mld_process_v2(idev, mlh2, &max_delay);
1361                 if (err < 0)
1362                         return err;
1363
1364                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1365                         if (mlh2->mld2q_nsrcs)
1366                                 return -EINVAL; /* no sources allowed */
1367
1368                         mld_gq_start_timer(idev);
1369                         return 0;
1370                 }
1371                 /* mark sources to include, if group & source-specific */
1372                 if (mlh2->mld2q_nsrcs != 0) {
1373                         if (!pskb_may_pull(skb, srcs_offset +
1374                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1375                                 return -EINVAL;
1376
1377                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1378                         mark = 1;
1379                 }
1380         } else {
1381                 return -EINVAL;
1382         }
1383
1384         read_lock_bh(&idev->lock);
1385         if (group_type == IPV6_ADDR_ANY) {
1386                 for (ma = idev->mc_list; ma; ma = ma->next) {
1387                         spin_lock_bh(&ma->mca_lock);
1388                         igmp6_group_queried(ma, max_delay);
1389                         spin_unlock_bh(&ma->mca_lock);
1390                 }
1391         } else {
1392                 for (ma = idev->mc_list; ma; ma = ma->next) {
1393                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1394                                 continue;
1395                         spin_lock_bh(&ma->mca_lock);
1396                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1397                                 /* gsquery <- gsquery && mark */
1398                                 if (!mark)
1399                                         ma->mca_flags &= ~MAF_GSQUERY;
1400                         } else {
1401                                 /* gsquery <- mark */
1402                                 if (mark)
1403                                         ma->mca_flags |= MAF_GSQUERY;
1404                                 else
1405                                         ma->mca_flags &= ~MAF_GSQUERY;
1406                         }
1407                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1408                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1409                                 igmp6_group_queried(ma, max_delay);
1410                         spin_unlock_bh(&ma->mca_lock);
1411                         break;
1412                 }
1413         }
1414         read_unlock_bh(&idev->lock);
1415
1416         return 0;
1417 }
1418
1419 /* called with rcu_read_lock() */
1420 int igmp6_event_report(struct sk_buff *skb)
1421 {
1422         struct ifmcaddr6 *ma;
1423         struct inet6_dev *idev;
1424         struct mld_msg *mld;
1425         int addr_type;
1426
1427         /* Our own report looped back. Ignore it. */
1428         if (skb->pkt_type == PACKET_LOOPBACK)
1429                 return 0;
1430
1431         /* send our report if the MC router may not have heard this report */
1432         if (skb->pkt_type != PACKET_MULTICAST &&
1433             skb->pkt_type != PACKET_BROADCAST)
1434                 return 0;
1435
1436         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1437                 return -EINVAL;
1438
1439         mld = (struct mld_msg *)icmp6_hdr(skb);
1440
1441         /* Drop reports with not link local source */
1442         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1443         if (addr_type != IPV6_ADDR_ANY &&
1444             !(addr_type&IPV6_ADDR_LINKLOCAL))
1445                 return -EINVAL;
1446
1447         idev = __in6_dev_get(skb->dev);
1448         if (idev == NULL)
1449                 return -ENODEV;
1450
1451         /*
1452          *      Cancel the timer for this group
1453          */
1454
1455         read_lock_bh(&idev->lock);
1456         for (ma = idev->mc_list; ma; ma = ma->next) {
1457                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1458                         spin_lock(&ma->mca_lock);
1459                         if (del_timer(&ma->mca_timer))
1460                                 atomic_dec(&ma->mca_refcnt);
1461                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1462                         spin_unlock(&ma->mca_lock);
1463                         break;
1464                 }
1465         }
1466         read_unlock_bh(&idev->lock);
1467         return 0;
1468 }
1469
1470 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1471                   int gdeleted, int sdeleted)
1472 {
1473         switch (type) {
1474         case MLD2_MODE_IS_INCLUDE:
1475         case MLD2_MODE_IS_EXCLUDE:
1476                 if (gdeleted || sdeleted)
1477                         return false;
1478                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1479                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1480                                 return true;
1481                         /* don't include if this source is excluded
1482                          * in all filters
1483                          */
1484                         if (psf->sf_count[MCAST_INCLUDE])
1485                                 return type == MLD2_MODE_IS_INCLUDE;
1486                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1487                                 psf->sf_count[MCAST_EXCLUDE];
1488                 }
1489                 return false;
1490         case MLD2_CHANGE_TO_INCLUDE:
1491                 if (gdeleted || sdeleted)
1492                         return false;
1493                 return psf->sf_count[MCAST_INCLUDE] != 0;
1494         case MLD2_CHANGE_TO_EXCLUDE:
1495                 if (gdeleted || sdeleted)
1496                         return false;
1497                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1498                     psf->sf_count[MCAST_INCLUDE])
1499                         return false;
1500                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1501                         psf->sf_count[MCAST_EXCLUDE];
1502         case MLD2_ALLOW_NEW_SOURCES:
1503                 if (gdeleted || !psf->sf_crcount)
1504                         return false;
1505                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1506         case MLD2_BLOCK_OLD_SOURCES:
1507                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1508                         return gdeleted || (psf->sf_crcount && sdeleted);
1509                 return psf->sf_crcount && !gdeleted && !sdeleted;
1510         }
1511         return false;
1512 }
1513
1514 static int
1515 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1516 {
1517         struct ip6_sf_list *psf;
1518         int scount = 0;
1519
1520         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1521                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1522                         continue;
1523                 scount++;
1524         }
1525         return scount;
1526 }
1527
1528 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1529                        struct net_device *dev,
1530                        const struct in6_addr *saddr,
1531                        const struct in6_addr *daddr,
1532                        int proto, int len)
1533 {
1534         struct ipv6hdr *hdr;
1535
1536         skb->protocol = htons(ETH_P_IPV6);
1537         skb->dev = dev;
1538
1539         skb_reset_network_header(skb);
1540         skb_put(skb, sizeof(struct ipv6hdr));
1541         hdr = ipv6_hdr(skb);
1542
1543         ip6_flow_hdr(hdr, 0, 0);
1544
1545         hdr->payload_len = htons(len);
1546         hdr->nexthdr = proto;
1547         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1548
1549         hdr->saddr = *saddr;
1550         hdr->daddr = *daddr;
1551 }
1552
1553 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1554 {
1555         struct net_device *dev = idev->dev;
1556         struct net *net = dev_net(dev);
1557         struct sock *sk = net->ipv6.igmp_sk;
1558         struct sk_buff *skb;
1559         struct mld2_report *pmr;
1560         struct in6_addr addr_buf;
1561         const struct in6_addr *saddr;
1562         int hlen = LL_RESERVED_SPACE(dev);
1563         int tlen = dev->needed_tailroom;
1564         int err;
1565         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1566                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1567                      IPV6_TLV_PADN, 0 };
1568
1569         /* we assume size > sizeof(ra) here */
1570         size += hlen + tlen;
1571         /* limit our allocations to order-0 page */
1572         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1573         skb = sock_alloc_send_skb(sk, size, 1, &err);
1574
1575         if (!skb)
1576                 return NULL;
1577
1578         skb->priority = TC_PRIO_CONTROL;
1579         skb_reserve(skb, hlen);
1580
1581         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1582                 /* <draft-ietf-magma-mld-source-05.txt>:
1583                  * use unspecified address as the source address
1584                  * when a valid link-local address is not available.
1585                  */
1586                 saddr = &in6addr_any;
1587         } else
1588                 saddr = &addr_buf;
1589
1590         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1591
1592         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1593
1594         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1595         skb_put(skb, sizeof(*pmr));
1596         pmr = (struct mld2_report *)skb_transport_header(skb);
1597         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1598         pmr->mld2r_resv1 = 0;
1599         pmr->mld2r_cksum = 0;
1600         pmr->mld2r_resv2 = 0;
1601         pmr->mld2r_ngrec = 0;
1602         return skb;
1603 }
1604
1605 static void mld_sendpack(struct sk_buff *skb)
1606 {
1607         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1608         struct mld2_report *pmr =
1609                               (struct mld2_report *)skb_transport_header(skb);
1610         int payload_len, mldlen;
1611         struct inet6_dev *idev;
1612         struct net *net = dev_net(skb->dev);
1613         int err;
1614         struct flowi6 fl6;
1615         struct dst_entry *dst;
1616
1617         rcu_read_lock();
1618         idev = __in6_dev_get(skb->dev);
1619         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1620
1621         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1622                 sizeof(*pip6);
1623         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1624         pip6->payload_len = htons(payload_len);
1625
1626         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1627                                            IPPROTO_ICMPV6,
1628                                            csum_partial(skb_transport_header(skb),
1629                                                         mldlen, 0));
1630
1631         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1632                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1633                          skb->dev->ifindex);
1634         dst = icmp6_dst_alloc(skb->dev, &fl6);
1635
1636         err = 0;
1637         if (IS_ERR(dst)) {
1638                 err = PTR_ERR(dst);
1639                 dst = NULL;
1640         }
1641         skb_dst_set(skb, dst);
1642         if (err)
1643                 goto err_out;
1644
1645         payload_len = skb->len;
1646
1647         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1648                       dst_output);
1649 out:
1650         if (!err) {
1651                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1652                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1653                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1654         } else {
1655                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1656         }
1657
1658         rcu_read_unlock();
1659         return;
1660
1661 err_out:
1662         kfree_skb(skb);
1663         goto out;
1664 }
1665
1666 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1667 {
1668         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1669 }
1670
1671 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1672         int type, struct mld2_grec **ppgr)
1673 {
1674         struct net_device *dev = pmc->idev->dev;
1675         struct mld2_report *pmr;
1676         struct mld2_grec *pgr;
1677
1678         if (!skb)
1679                 skb = mld_newpack(pmc->idev, dev->mtu);
1680         if (!skb)
1681                 return NULL;
1682         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1683         pgr->grec_type = type;
1684         pgr->grec_auxwords = 0;
1685         pgr->grec_nsrcs = 0;
1686         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1687         pmr = (struct mld2_report *)skb_transport_header(skb);
1688         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1689         *ppgr = pgr;
1690         return skb;
1691 }
1692
1693 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1694         skb_tailroom(skb)) : 0)
1695
1696 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1697         int type, int gdeleted, int sdeleted, int crsend)
1698 {
1699         struct inet6_dev *idev = pmc->idev;
1700         struct net_device *dev = idev->dev;
1701         struct mld2_report *pmr;
1702         struct mld2_grec *pgr = NULL;
1703         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1704         int scount, stotal, first, isquery, truncate;
1705
1706         if (pmc->mca_flags & MAF_NOREPORT)
1707                 return skb;
1708
1709         isquery = type == MLD2_MODE_IS_INCLUDE ||
1710                   type == MLD2_MODE_IS_EXCLUDE;
1711         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1712                     type == MLD2_CHANGE_TO_EXCLUDE;
1713
1714         stotal = scount = 0;
1715
1716         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1717
1718         if (!*psf_list)
1719                 goto empty_source;
1720
1721         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1722
1723         /* EX and TO_EX get a fresh packet, if needed */
1724         if (truncate) {
1725                 if (pmr && pmr->mld2r_ngrec &&
1726                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1727                         if (skb)
1728                                 mld_sendpack(skb);
1729                         skb = mld_newpack(idev, dev->mtu);
1730                 }
1731         }
1732         first = 1;
1733         psf_prev = NULL;
1734         for (psf = *psf_list; psf; psf = psf_next) {
1735                 struct in6_addr *psrc;
1736
1737                 psf_next = psf->sf_next;
1738
1739                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1740                         psf_prev = psf;
1741                         continue;
1742                 }
1743
1744                 /* clear marks on query responses */
1745                 if (isquery)
1746                         psf->sf_gsresp = 0;
1747
1748                 if (AVAILABLE(skb) < sizeof(*psrc) +
1749                     first*sizeof(struct mld2_grec)) {
1750                         if (truncate && !first)
1751                                 break;   /* truncate these */
1752                         if (pgr)
1753                                 pgr->grec_nsrcs = htons(scount);
1754                         if (skb)
1755                                 mld_sendpack(skb);
1756                         skb = mld_newpack(idev, dev->mtu);
1757                         first = 1;
1758                         scount = 0;
1759                 }
1760                 if (first) {
1761                         skb = add_grhead(skb, pmc, type, &pgr);
1762                         first = 0;
1763                 }
1764                 if (!skb)
1765                         return NULL;
1766                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1767                 *psrc = psf->sf_addr;
1768                 scount++; stotal++;
1769                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1770                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1771                         psf->sf_crcount--;
1772                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1773                                 if (psf_prev)
1774                                         psf_prev->sf_next = psf->sf_next;
1775                                 else
1776                                         *psf_list = psf->sf_next;
1777                                 kfree(psf);
1778                                 continue;
1779                         }
1780                 }
1781                 psf_prev = psf;
1782         }
1783
1784 empty_source:
1785         if (!stotal) {
1786                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1787                     type == MLD2_BLOCK_OLD_SOURCES)
1788                         return skb;
1789                 if (pmc->mca_crcount || isquery || crsend) {
1790                         /* make sure we have room for group header */
1791                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1792                                 mld_sendpack(skb);
1793                                 skb = NULL; /* add_grhead will get a new one */
1794                         }
1795                         skb = add_grhead(skb, pmc, type, &pgr);
1796                 }
1797         }
1798         if (pgr)
1799                 pgr->grec_nsrcs = htons(scount);
1800
1801         if (isquery)
1802                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1803         return skb;
1804 }
1805
1806 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1807 {
1808         struct sk_buff *skb = NULL;
1809         int type;
1810
1811         read_lock_bh(&idev->lock);
1812         if (!pmc) {
1813                 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1814                         if (pmc->mca_flags & MAF_NOREPORT)
1815                                 continue;
1816                         spin_lock_bh(&pmc->mca_lock);
1817                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1818                                 type = MLD2_MODE_IS_EXCLUDE;
1819                         else
1820                                 type = MLD2_MODE_IS_INCLUDE;
1821                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1822                         spin_unlock_bh(&pmc->mca_lock);
1823                 }
1824         } else {
1825                 spin_lock_bh(&pmc->mca_lock);
1826                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1827                         type = MLD2_MODE_IS_EXCLUDE;
1828                 else
1829                         type = MLD2_MODE_IS_INCLUDE;
1830                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1831                 spin_unlock_bh(&pmc->mca_lock);
1832         }
1833         read_unlock_bh(&idev->lock);
1834         if (skb)
1835                 mld_sendpack(skb);
1836 }
1837
1838 /*
1839  * remove zero-count source records from a source filter list
1840  */
1841 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1842 {
1843         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1844
1845         psf_prev = NULL;
1846         for (psf = *ppsf; psf; psf = psf_next) {
1847                 psf_next = psf->sf_next;
1848                 if (psf->sf_crcount == 0) {
1849                         if (psf_prev)
1850                                 psf_prev->sf_next = psf->sf_next;
1851                         else
1852                                 *ppsf = psf->sf_next;
1853                         kfree(psf);
1854                 } else
1855                         psf_prev = psf;
1856         }
1857 }
1858
1859 static void mld_send_cr(struct inet6_dev *idev)
1860 {
1861         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1862         struct sk_buff *skb = NULL;
1863         int type, dtype;
1864
1865         read_lock_bh(&idev->lock);
1866         spin_lock(&idev->mc_lock);
1867
1868         /* deleted MCA's */
1869         pmc_prev = NULL;
1870         for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1871                 pmc_next = pmc->next;
1872                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1873                         type = MLD2_BLOCK_OLD_SOURCES;
1874                         dtype = MLD2_BLOCK_OLD_SOURCES;
1875                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1876                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1877                 }
1878                 if (pmc->mca_crcount) {
1879                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1880                                 type = MLD2_CHANGE_TO_INCLUDE;
1881                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1882                         }
1883                         pmc->mca_crcount--;
1884                         if (pmc->mca_crcount == 0) {
1885                                 mld_clear_zeros(&pmc->mca_tomb);
1886                                 mld_clear_zeros(&pmc->mca_sources);
1887                         }
1888                 }
1889                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1890                     !pmc->mca_sources) {
1891                         if (pmc_prev)
1892                                 pmc_prev->next = pmc_next;
1893                         else
1894                                 idev->mc_tomb = pmc_next;
1895                         in6_dev_put(pmc->idev);
1896                         kfree(pmc);
1897                 } else
1898                         pmc_prev = pmc;
1899         }
1900         spin_unlock(&idev->mc_lock);
1901
1902         /* change recs */
1903         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1904                 spin_lock_bh(&pmc->mca_lock);
1905                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1906                         type = MLD2_BLOCK_OLD_SOURCES;
1907                         dtype = MLD2_ALLOW_NEW_SOURCES;
1908                 } else {
1909                         type = MLD2_ALLOW_NEW_SOURCES;
1910                         dtype = MLD2_BLOCK_OLD_SOURCES;
1911                 }
1912                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1913                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1914
1915                 /* filter mode changes */
1916                 if (pmc->mca_crcount) {
1917                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1918                                 type = MLD2_CHANGE_TO_EXCLUDE;
1919                         else
1920                                 type = MLD2_CHANGE_TO_INCLUDE;
1921                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1922                         pmc->mca_crcount--;
1923                 }
1924                 spin_unlock_bh(&pmc->mca_lock);
1925         }
1926         read_unlock_bh(&idev->lock);
1927         if (!skb)
1928                 return;
1929         (void) mld_sendpack(skb);
1930 }
1931
1932 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1933 {
1934         struct net *net = dev_net(dev);
1935         struct sock *sk = net->ipv6.igmp_sk;
1936         struct inet6_dev *idev;
1937         struct sk_buff *skb;
1938         struct mld_msg *hdr;
1939         const struct in6_addr *snd_addr, *saddr;
1940         struct in6_addr addr_buf;
1941         int hlen = LL_RESERVED_SPACE(dev);
1942         int tlen = dev->needed_tailroom;
1943         int err, len, payload_len, full_len;
1944         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1945                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1946                      IPV6_TLV_PADN, 0 };
1947         struct flowi6 fl6;
1948         struct dst_entry *dst;
1949
1950         if (type == ICMPV6_MGM_REDUCTION)
1951                 snd_addr = &in6addr_linklocal_allrouters;
1952         else
1953                 snd_addr = addr;
1954
1955         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1956         payload_len = len + sizeof(ra);
1957         full_len = sizeof(struct ipv6hdr) + payload_len;
1958
1959         rcu_read_lock();
1960         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1961                       IPSTATS_MIB_OUT, full_len);
1962         rcu_read_unlock();
1963
1964         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1965
1966         if (skb == NULL) {
1967                 rcu_read_lock();
1968                 IP6_INC_STATS(net, __in6_dev_get(dev),
1969                               IPSTATS_MIB_OUTDISCARDS);
1970                 rcu_read_unlock();
1971                 return;
1972         }
1973         skb->priority = TC_PRIO_CONTROL;
1974         skb_reserve(skb, hlen);
1975
1976         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1977                 /* <draft-ietf-magma-mld-source-05.txt>:
1978                  * use unspecified address as the source address
1979                  * when a valid link-local address is not available.
1980                  */
1981                 saddr = &in6addr_any;
1982         } else
1983                 saddr = &addr_buf;
1984
1985         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1986
1987         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1988
1989         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1990         memset(hdr, 0, sizeof(struct mld_msg));
1991         hdr->mld_type = type;
1992         hdr->mld_mca = *addr;
1993
1994         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1995                                          IPPROTO_ICMPV6,
1996                                          csum_partial(hdr, len, 0));
1997
1998         rcu_read_lock();
1999         idev = __in6_dev_get(skb->dev);
2000
2001         icmpv6_flow_init(sk, &fl6, type,
2002                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2003                          skb->dev->ifindex);
2004         dst = icmp6_dst_alloc(skb->dev, &fl6);
2005         if (IS_ERR(dst)) {
2006                 err = PTR_ERR(dst);
2007                 goto err_out;
2008         }
2009
2010         skb_dst_set(skb, dst);
2011         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
2012                       dst_output);
2013 out:
2014         if (!err) {
2015                 ICMP6MSGOUT_INC_STATS(net, idev, type);
2016                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2017                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
2018         } else
2019                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2020
2021         rcu_read_unlock();
2022         return;
2023
2024 err_out:
2025         kfree_skb(skb);
2026         goto out;
2027 }
2028
2029 static void mld_send_initial_cr(struct inet6_dev *idev)
2030 {
2031         struct sk_buff *skb;
2032         struct ifmcaddr6 *pmc;
2033         int type;
2034
2035         if (mld_in_v1_mode(idev))
2036                 return;
2037
2038         skb = NULL;
2039         read_lock_bh(&idev->lock);
2040         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2041                 spin_lock_bh(&pmc->mca_lock);
2042                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2043                         type = MLD2_CHANGE_TO_EXCLUDE;
2044                 else
2045                         type = MLD2_CHANGE_TO_INCLUDE;
2046                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2047                 spin_unlock_bh(&pmc->mca_lock);
2048         }
2049         read_unlock_bh(&idev->lock);
2050         if (skb)
2051                 mld_sendpack(skb);
2052 }
2053
2054 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2055 {
2056         idev->mc_dad_count = idev->mc_qrv;
2057         if (idev->mc_dad_count) {
2058                 mld_send_initial_cr(idev);
2059                 idev->mc_dad_count--;
2060                 if (idev->mc_dad_count)
2061                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2062         }
2063 }
2064
2065 static void mld_dad_timer_expire(unsigned long data)
2066 {
2067         struct inet6_dev *idev = (struct inet6_dev *)data;
2068
2069         mld_send_initial_cr(idev);
2070         if (idev->mc_dad_count) {
2071                 idev->mc_dad_count--;
2072                 if (idev->mc_dad_count)
2073                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2074         }
2075         in6_dev_put(idev);
2076 }
2077
2078 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2079         const struct in6_addr *psfsrc)
2080 {
2081         struct ip6_sf_list *psf, *psf_prev;
2082         int rv = 0;
2083
2084         psf_prev = NULL;
2085         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2086                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2087                         break;
2088                 psf_prev = psf;
2089         }
2090         if (!psf || psf->sf_count[sfmode] == 0) {
2091                 /* source filter not found, or count wrong =>  bug */
2092                 return -ESRCH;
2093         }
2094         psf->sf_count[sfmode]--;
2095         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2096                 struct inet6_dev *idev = pmc->idev;
2097
2098                 /* no more filters for this source */
2099                 if (psf_prev)
2100                         psf_prev->sf_next = psf->sf_next;
2101                 else
2102                         pmc->mca_sources = psf->sf_next;
2103                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2104                     !mld_in_v1_mode(idev)) {
2105                         psf->sf_crcount = idev->mc_qrv;
2106                         psf->sf_next = pmc->mca_tomb;
2107                         pmc->mca_tomb = psf;
2108                         rv = 1;
2109                 } else
2110                         kfree(psf);
2111         }
2112         return rv;
2113 }
2114
2115 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2116                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2117                           int delta)
2118 {
2119         struct ifmcaddr6 *pmc;
2120         int     changerec = 0;
2121         int     i, err;
2122
2123         if (!idev)
2124                 return -ENODEV;
2125         read_lock_bh(&idev->lock);
2126         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2127                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2128                         break;
2129         }
2130         if (!pmc) {
2131                 /* MCA not found?? bug */
2132                 read_unlock_bh(&idev->lock);
2133                 return -ESRCH;
2134         }
2135         spin_lock_bh(&pmc->mca_lock);
2136         sf_markstate(pmc);
2137         if (!delta) {
2138                 if (!pmc->mca_sfcount[sfmode]) {
2139                         spin_unlock_bh(&pmc->mca_lock);
2140                         read_unlock_bh(&idev->lock);
2141                         return -EINVAL;
2142                 }
2143                 pmc->mca_sfcount[sfmode]--;
2144         }
2145         err = 0;
2146         for (i = 0; i < sfcount; i++) {
2147                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2148
2149                 changerec |= rv > 0;
2150                 if (!err && rv < 0)
2151                         err = rv;
2152         }
2153         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2154             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2155             pmc->mca_sfcount[MCAST_INCLUDE]) {
2156                 struct ip6_sf_list *psf;
2157
2158                 /* filter mode change */
2159                 pmc->mca_sfmode = MCAST_INCLUDE;
2160                 pmc->mca_crcount = idev->mc_qrv;
2161                 idev->mc_ifc_count = pmc->mca_crcount;
2162                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2163                         psf->sf_crcount = 0;
2164                 mld_ifc_event(pmc->idev);
2165         } else if (sf_setstate(pmc) || changerec)
2166                 mld_ifc_event(pmc->idev);
2167         spin_unlock_bh(&pmc->mca_lock);
2168         read_unlock_bh(&idev->lock);
2169         return err;
2170 }
2171
2172 /*
2173  * Add multicast single-source filter to the interface list
2174  */
2175 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2176         const struct in6_addr *psfsrc)
2177 {
2178         struct ip6_sf_list *psf, *psf_prev;
2179
2180         psf_prev = NULL;
2181         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2182                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2183                         break;
2184                 psf_prev = psf;
2185         }
2186         if (!psf) {
2187                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2188                 if (!psf)
2189                         return -ENOBUFS;
2190
2191                 psf->sf_addr = *psfsrc;
2192                 if (psf_prev) {
2193                         psf_prev->sf_next = psf;
2194                 } else
2195                         pmc->mca_sources = psf;
2196         }
2197         psf->sf_count[sfmode]++;
2198         return 0;
2199 }
2200
2201 static void sf_markstate(struct ifmcaddr6 *pmc)
2202 {
2203         struct ip6_sf_list *psf;
2204         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2205
2206         for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2207                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2208                         psf->sf_oldin = mca_xcount ==
2209                                 psf->sf_count[MCAST_EXCLUDE] &&
2210                                 !psf->sf_count[MCAST_INCLUDE];
2211                 } else
2212                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2213 }
2214
2215 static int sf_setstate(struct ifmcaddr6 *pmc)
2216 {
2217         struct ip6_sf_list *psf, *dpsf;
2218         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2219         int qrv = pmc->idev->mc_qrv;
2220         int new_in, rv;
2221
2222         rv = 0;
2223         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2224                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2225                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2226                                 !psf->sf_count[MCAST_INCLUDE];
2227                 } else
2228                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2229                 if (new_in) {
2230                         if (!psf->sf_oldin) {
2231                                 struct ip6_sf_list *prev = NULL;
2232
2233                                 for (dpsf = pmc->mca_tomb; dpsf;
2234                                      dpsf = dpsf->sf_next) {
2235                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2236                                             &psf->sf_addr))
2237                                                 break;
2238                                         prev = dpsf;
2239                                 }
2240                                 if (dpsf) {
2241                                         if (prev)
2242                                                 prev->sf_next = dpsf->sf_next;
2243                                         else
2244                                                 pmc->mca_tomb = dpsf->sf_next;
2245                                         kfree(dpsf);
2246                                 }
2247                                 psf->sf_crcount = qrv;
2248                                 rv++;
2249                         }
2250                 } else if (psf->sf_oldin) {
2251                         psf->sf_crcount = 0;
2252                         /*
2253                          * add or update "delete" records if an active filter
2254                          * is now inactive
2255                          */
2256                         for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2257                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2258                                     &psf->sf_addr))
2259                                         break;
2260                         if (!dpsf) {
2261                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2262                                 if (!dpsf)
2263                                         continue;
2264                                 *dpsf = *psf;
2265                                 /* pmc->mca_lock held by callers */
2266                                 dpsf->sf_next = pmc->mca_tomb;
2267                                 pmc->mca_tomb = dpsf;
2268                         }
2269                         dpsf->sf_crcount = qrv;
2270                         rv++;
2271                 }
2272         }
2273         return rv;
2274 }
2275
2276 /*
2277  * Add multicast source filter list to the interface list
2278  */
2279 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2280                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2281                           int delta)
2282 {
2283         struct ifmcaddr6 *pmc;
2284         int     isexclude;
2285         int     i, err;
2286
2287         if (!idev)
2288                 return -ENODEV;
2289         read_lock_bh(&idev->lock);
2290         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2291                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2292                         break;
2293         }
2294         if (!pmc) {
2295                 /* MCA not found?? bug */
2296                 read_unlock_bh(&idev->lock);
2297                 return -ESRCH;
2298         }
2299         spin_lock_bh(&pmc->mca_lock);
2300
2301         sf_markstate(pmc);
2302         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2303         if (!delta)
2304                 pmc->mca_sfcount[sfmode]++;
2305         err = 0;
2306         for (i = 0; i < sfcount; i++) {
2307                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2308                 if (err)
2309                         break;
2310         }
2311         if (err) {
2312                 int j;
2313
2314                 if (!delta)
2315                         pmc->mca_sfcount[sfmode]--;
2316                 for (j = 0; j < i; j++)
2317                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2318         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2319                 struct ip6_sf_list *psf;
2320
2321                 /* filter mode change */
2322                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2323                         pmc->mca_sfmode = MCAST_EXCLUDE;
2324                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2325                         pmc->mca_sfmode = MCAST_INCLUDE;
2326                 /* else no filters; keep old mode for reports */
2327
2328                 pmc->mca_crcount = idev->mc_qrv;
2329                 idev->mc_ifc_count = pmc->mca_crcount;
2330                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2331                         psf->sf_crcount = 0;
2332                 mld_ifc_event(idev);
2333         } else if (sf_setstate(pmc))
2334                 mld_ifc_event(idev);
2335         spin_unlock_bh(&pmc->mca_lock);
2336         read_unlock_bh(&idev->lock);
2337         return err;
2338 }
2339
2340 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2341 {
2342         struct ip6_sf_list *psf, *nextpsf;
2343
2344         for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2345                 nextpsf = psf->sf_next;
2346                 kfree(psf);
2347         }
2348         pmc->mca_tomb = NULL;
2349         for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2350                 nextpsf = psf->sf_next;
2351                 kfree(psf);
2352         }
2353         pmc->mca_sources = NULL;
2354         pmc->mca_sfmode = MCAST_EXCLUDE;
2355         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2356         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2357 }
2358
2359
2360 static void igmp6_join_group(struct ifmcaddr6 *ma)
2361 {
2362         unsigned long delay;
2363
2364         if (ma->mca_flags & MAF_NOREPORT)
2365                 return;
2366
2367         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2368
2369         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2370
2371         spin_lock_bh(&ma->mca_lock);
2372         if (del_timer(&ma->mca_timer)) {
2373                 atomic_dec(&ma->mca_refcnt);
2374                 delay = ma->mca_timer.expires - jiffies;
2375         }
2376
2377         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2378                 atomic_inc(&ma->mca_refcnt);
2379         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2380         spin_unlock_bh(&ma->mca_lock);
2381 }
2382
2383 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2384                             struct inet6_dev *idev)
2385 {
2386         int err;
2387
2388         /* callers have the socket lock and rtnl lock
2389          * so no other readers or writers of iml or its sflist
2390          */
2391         if (!iml->sflist) {
2392                 /* any-source empty exclude case */
2393                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2394         }
2395         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2396                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2397         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2398         iml->sflist = NULL;
2399         return err;
2400 }
2401
2402 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2403 {
2404         if (mld_in_v1_mode(ma->idev)) {
2405                 if (ma->mca_flags & MAF_LAST_REPORTER)
2406                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2407                                 ICMPV6_MGM_REDUCTION);
2408         } else {
2409                 mld_add_delrec(ma->idev, ma);
2410                 mld_ifc_event(ma->idev);
2411         }
2412 }
2413
2414 static void mld_gq_timer_expire(unsigned long data)
2415 {
2416         struct inet6_dev *idev = (struct inet6_dev *)data;
2417
2418         idev->mc_gq_running = 0;
2419         mld_send_report(idev, NULL);
2420         in6_dev_put(idev);
2421 }
2422
2423 static void mld_ifc_timer_expire(unsigned long data)
2424 {
2425         struct inet6_dev *idev = (struct inet6_dev *)data;
2426
2427         mld_send_cr(idev);
2428         if (idev->mc_ifc_count) {
2429                 idev->mc_ifc_count--;
2430                 if (idev->mc_ifc_count)
2431                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2432         }
2433         in6_dev_put(idev);
2434 }
2435
2436 static void mld_ifc_event(struct inet6_dev *idev)
2437 {
2438         if (mld_in_v1_mode(idev))
2439                 return;
2440         idev->mc_ifc_count = idev->mc_qrv;
2441         mld_ifc_start_timer(idev, 1);
2442 }
2443
2444
2445 static void igmp6_timer_handler(unsigned long data)
2446 {
2447         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2448
2449         if (mld_in_v1_mode(ma->idev))
2450                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2451         else
2452                 mld_send_report(ma->idev, ma);
2453
2454         spin_lock(&ma->mca_lock);
2455         ma->mca_flags |=  MAF_LAST_REPORTER;
2456         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2457         spin_unlock(&ma->mca_lock);
2458         ma_put(ma);
2459 }
2460
2461 /* Device changing type */
2462
2463 void ipv6_mc_unmap(struct inet6_dev *idev)
2464 {
2465         struct ifmcaddr6 *i;
2466
2467         /* Install multicast list, except for all-nodes (already installed) */
2468
2469         read_lock_bh(&idev->lock);
2470         for (i = idev->mc_list; i; i = i->next)
2471                 igmp6_group_dropped(i);
2472         read_unlock_bh(&idev->lock);
2473 }
2474
2475 void ipv6_mc_remap(struct inet6_dev *idev)
2476 {
2477         ipv6_mc_up(idev);
2478 }
2479
2480 /* Device going down */
2481
2482 void ipv6_mc_down(struct inet6_dev *idev)
2483 {
2484         struct ifmcaddr6 *i;
2485
2486         /* Withdraw multicast list */
2487
2488         read_lock_bh(&idev->lock);
2489         mld_ifc_stop_timer(idev);
2490         mld_gq_stop_timer(idev);
2491         mld_dad_stop_timer(idev);
2492
2493         for (i = idev->mc_list; i; i = i->next)
2494                 igmp6_group_dropped(i);
2495         read_unlock_bh(&idev->lock);
2496
2497         mld_clear_delrec(idev);
2498 }
2499
2500 static void ipv6_mc_reset(struct inet6_dev *idev)
2501 {
2502         idev->mc_qrv = sysctl_mld_qrv;
2503         idev->mc_qi = MLD_QI_DEFAULT;
2504         idev->mc_qri = MLD_QRI_DEFAULT;
2505         idev->mc_v1_seen = 0;
2506         idev->mc_maxdelay = unsolicited_report_interval(idev);
2507 }
2508
2509 /* Device going up */
2510
2511 void ipv6_mc_up(struct inet6_dev *idev)
2512 {
2513         struct ifmcaddr6 *i;
2514
2515         /* Install multicast list, except for all-nodes (already installed) */
2516
2517         read_lock_bh(&idev->lock);
2518         ipv6_mc_reset(idev);
2519         for (i = idev->mc_list; i; i = i->next)
2520                 igmp6_group_added(i);
2521         read_unlock_bh(&idev->lock);
2522 }
2523
2524 /* IPv6 device initialization. */
2525
2526 void ipv6_mc_init_dev(struct inet6_dev *idev)
2527 {
2528         write_lock_bh(&idev->lock);
2529         spin_lock_init(&idev->mc_lock);
2530         idev->mc_gq_running = 0;
2531         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2532                         (unsigned long)idev);
2533         idev->mc_tomb = NULL;
2534         idev->mc_ifc_count = 0;
2535         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2536                         (unsigned long)idev);
2537         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2538                     (unsigned long)idev);
2539         ipv6_mc_reset(idev);
2540         write_unlock_bh(&idev->lock);
2541 }
2542
2543 /*
2544  *      Device is about to be destroyed: clean up.
2545  */
2546
2547 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2548 {
2549         struct ifmcaddr6 *i;
2550
2551         /* Deactivate timers */
2552         ipv6_mc_down(idev);
2553
2554         /* Delete all-nodes address. */
2555         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2556          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2557          * fail.
2558          */
2559         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2560
2561         if (idev->cnf.forwarding)
2562                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2563
2564         write_lock_bh(&idev->lock);
2565         while ((i = idev->mc_list) != NULL) {
2566                 idev->mc_list = i->next;
2567                 write_unlock_bh(&idev->lock);
2568
2569                 igmp6_group_dropped(i);
2570                 ma_put(i);
2571
2572                 write_lock_bh(&idev->lock);
2573         }
2574         write_unlock_bh(&idev->lock);
2575 }
2576
2577 #ifdef CONFIG_PROC_FS
2578 struct igmp6_mc_iter_state {
2579         struct seq_net_private p;
2580         struct net_device *dev;
2581         struct inet6_dev *idev;
2582 };
2583
2584 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2585
2586 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2587 {
2588         struct ifmcaddr6 *im = NULL;
2589         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2590         struct net *net = seq_file_net(seq);
2591
2592         state->idev = NULL;
2593         for_each_netdev_rcu(net, state->dev) {
2594                 struct inet6_dev *idev;
2595                 idev = __in6_dev_get(state->dev);
2596                 if (!idev)
2597                         continue;
2598                 read_lock_bh(&idev->lock);
2599                 im = idev->mc_list;
2600                 if (im) {
2601                         state->idev = idev;
2602                         break;
2603                 }
2604                 read_unlock_bh(&idev->lock);
2605         }
2606         return im;
2607 }
2608
2609 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2610 {
2611         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2612
2613         im = im->next;
2614         while (!im) {
2615                 if (likely(state->idev != NULL))
2616                         read_unlock_bh(&state->idev->lock);
2617
2618                 state->dev = next_net_device_rcu(state->dev);
2619                 if (!state->dev) {
2620                         state->idev = NULL;
2621                         break;
2622                 }
2623                 state->idev = __in6_dev_get(state->dev);
2624                 if (!state->idev)
2625                         continue;
2626                 read_lock_bh(&state->idev->lock);
2627                 im = state->idev->mc_list;
2628         }
2629         return im;
2630 }
2631
2632 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2633 {
2634         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2635         if (im)
2636                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2637                         --pos;
2638         return pos ? NULL : im;
2639 }
2640
2641 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2642         __acquires(RCU)
2643 {
2644         rcu_read_lock();
2645         return igmp6_mc_get_idx(seq, *pos);
2646 }
2647
2648 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2649 {
2650         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2651
2652         ++*pos;
2653         return im;
2654 }
2655
2656 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2657         __releases(RCU)
2658 {
2659         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2660
2661         if (likely(state->idev != NULL)) {
2662                 read_unlock_bh(&state->idev->lock);
2663                 state->idev = NULL;
2664         }
2665         state->dev = NULL;
2666         rcu_read_unlock();
2667 }
2668
2669 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2670 {
2671         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2672         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2673
2674         seq_printf(seq,
2675                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2676                    state->dev->ifindex, state->dev->name,
2677                    &im->mca_addr,
2678                    im->mca_users, im->mca_flags,
2679                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2680                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2681         return 0;
2682 }
2683
2684 static const struct seq_operations igmp6_mc_seq_ops = {
2685         .start  =       igmp6_mc_seq_start,
2686         .next   =       igmp6_mc_seq_next,
2687         .stop   =       igmp6_mc_seq_stop,
2688         .show   =       igmp6_mc_seq_show,
2689 };
2690
2691 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2692 {
2693         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2694                             sizeof(struct igmp6_mc_iter_state));
2695 }
2696
2697 static const struct file_operations igmp6_mc_seq_fops = {
2698         .owner          =       THIS_MODULE,
2699         .open           =       igmp6_mc_seq_open,
2700         .read           =       seq_read,
2701         .llseek         =       seq_lseek,
2702         .release        =       seq_release_net,
2703 };
2704
2705 struct igmp6_mcf_iter_state {
2706         struct seq_net_private p;
2707         struct net_device *dev;
2708         struct inet6_dev *idev;
2709         struct ifmcaddr6 *im;
2710 };
2711
2712 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2713
2714 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2715 {
2716         struct ip6_sf_list *psf = NULL;
2717         struct ifmcaddr6 *im = NULL;
2718         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2719         struct net *net = seq_file_net(seq);
2720
2721         state->idev = NULL;
2722         state->im = NULL;
2723         for_each_netdev_rcu(net, state->dev) {
2724                 struct inet6_dev *idev;
2725                 idev = __in6_dev_get(state->dev);
2726                 if (unlikely(idev == NULL))
2727                         continue;
2728                 read_lock_bh(&idev->lock);
2729                 im = idev->mc_list;
2730                 if (likely(im != NULL)) {
2731                         spin_lock_bh(&im->mca_lock);
2732                         psf = im->mca_sources;
2733                         if (likely(psf != NULL)) {
2734                                 state->im = im;
2735                                 state->idev = idev;
2736                                 break;
2737                         }
2738                         spin_unlock_bh(&im->mca_lock);
2739                 }
2740                 read_unlock_bh(&idev->lock);
2741         }
2742         return psf;
2743 }
2744
2745 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2746 {
2747         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2748
2749         psf = psf->sf_next;
2750         while (!psf) {
2751                 spin_unlock_bh(&state->im->mca_lock);
2752                 state->im = state->im->next;
2753                 while (!state->im) {
2754                         if (likely(state->idev != NULL))
2755                                 read_unlock_bh(&state->idev->lock);
2756
2757                         state->dev = next_net_device_rcu(state->dev);
2758                         if (!state->dev) {
2759                                 state->idev = NULL;
2760                                 goto out;
2761                         }
2762                         state->idev = __in6_dev_get(state->dev);
2763                         if (!state->idev)
2764                                 continue;
2765                         read_lock_bh(&state->idev->lock);
2766                         state->im = state->idev->mc_list;
2767                 }
2768                 if (!state->im)
2769                         break;
2770                 spin_lock_bh(&state->im->mca_lock);
2771                 psf = state->im->mca_sources;
2772         }
2773 out:
2774         return psf;
2775 }
2776
2777 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2778 {
2779         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2780         if (psf)
2781                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2782                         --pos;
2783         return pos ? NULL : psf;
2784 }
2785
2786 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2787         __acquires(RCU)
2788 {
2789         rcu_read_lock();
2790         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2791 }
2792
2793 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2794 {
2795         struct ip6_sf_list *psf;
2796         if (v == SEQ_START_TOKEN)
2797                 psf = igmp6_mcf_get_first(seq);
2798         else
2799                 psf = igmp6_mcf_get_next(seq, v);
2800         ++*pos;
2801         return psf;
2802 }
2803
2804 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2805         __releases(RCU)
2806 {
2807         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2808         if (likely(state->im != NULL)) {
2809                 spin_unlock_bh(&state->im->mca_lock);
2810                 state->im = NULL;
2811         }
2812         if (likely(state->idev != NULL)) {
2813                 read_unlock_bh(&state->idev->lock);
2814                 state->idev = NULL;
2815         }
2816         state->dev = NULL;
2817         rcu_read_unlock();
2818 }
2819
2820 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2821 {
2822         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2823         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2824
2825         if (v == SEQ_START_TOKEN) {
2826                 seq_printf(seq,
2827                            "%3s %6s "
2828                            "%32s %32s %6s %6s\n", "Idx",
2829                            "Device", "Multicast Address",
2830                            "Source Address", "INC", "EXC");
2831         } else {
2832                 seq_printf(seq,
2833                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2834                            state->dev->ifindex, state->dev->name,
2835                            &state->im->mca_addr,
2836                            &psf->sf_addr,
2837                            psf->sf_count[MCAST_INCLUDE],
2838                            psf->sf_count[MCAST_EXCLUDE]);
2839         }
2840         return 0;
2841 }
2842
2843 static const struct seq_operations igmp6_mcf_seq_ops = {
2844         .start  =       igmp6_mcf_seq_start,
2845         .next   =       igmp6_mcf_seq_next,
2846         .stop   =       igmp6_mcf_seq_stop,
2847         .show   =       igmp6_mcf_seq_show,
2848 };
2849
2850 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2851 {
2852         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2853                             sizeof(struct igmp6_mcf_iter_state));
2854 }
2855
2856 static const struct file_operations igmp6_mcf_seq_fops = {
2857         .owner          =       THIS_MODULE,
2858         .open           =       igmp6_mcf_seq_open,
2859         .read           =       seq_read,
2860         .llseek         =       seq_lseek,
2861         .release        =       seq_release_net,
2862 };
2863
2864 static int __net_init igmp6_proc_init(struct net *net)
2865 {
2866         int err;
2867
2868         err = -ENOMEM;
2869         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2870                 goto out;
2871         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2872                          &igmp6_mcf_seq_fops))
2873                 goto out_proc_net_igmp6;
2874
2875         err = 0;
2876 out:
2877         return err;
2878
2879 out_proc_net_igmp6:
2880         remove_proc_entry("igmp6", net->proc_net);
2881         goto out;
2882 }
2883
2884 static void __net_exit igmp6_proc_exit(struct net *net)
2885 {
2886         remove_proc_entry("mcfilter6", net->proc_net);
2887         remove_proc_entry("igmp6", net->proc_net);
2888 }
2889 #else
2890 static inline int igmp6_proc_init(struct net *net)
2891 {
2892         return 0;
2893 }
2894 static inline void igmp6_proc_exit(struct net *net)
2895 {
2896 }
2897 #endif
2898
2899 static int __net_init igmp6_net_init(struct net *net)
2900 {
2901         int err;
2902
2903         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2904                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2905         if (err < 0) {
2906                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2907                        err);
2908                 goto out;
2909         }
2910
2911         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2912
2913         err = igmp6_proc_init(net);
2914         if (err)
2915                 goto out_sock_create;
2916 out:
2917         return err;
2918
2919 out_sock_create:
2920         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2921         goto out;
2922 }
2923
2924 static void __net_exit igmp6_net_exit(struct net *net)
2925 {
2926         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2927         igmp6_proc_exit(net);
2928 }
2929
2930 static struct pernet_operations igmp6_net_ops = {
2931         .init = igmp6_net_init,
2932         .exit = igmp6_net_exit,
2933 };
2934
2935 int __init igmp6_init(void)
2936 {
2937         return register_pernet_subsys(&igmp6_net_ops);
2938 }
2939
2940 void igmp6_cleanup(void)
2941 {
2942         unregister_pernet_subsys(&igmp6_net_ops);
2943 }